CN114909670A - Hot air heating system and method for cooperatively controlling wide coal adaptability through composite heat transfer - Google Patents

Abstract

The present application discloses a hot air heating system and method for composite heat transfer cooperative control of wide coal type adaptability, including a two-silo air preheater body, an independent air preheater body, a hot flue gas flow control system and a hot primary air flow control system system, the two-silo air preheater body is used for heating secondary air, including flue gas passages and secondary air passages arranged at intervals; the above-mentioned independent air preheater body is used for heating primary air, including mutually independent flue gas chambers The hot flue gas flow control system includes a hot flue gas bypass flue and a flow regulating device communicated with the flue gas cavity, and is used to control the delivery to the independent air preheater body. The flow rate of the hot flue gas that heats the primary air is used to adjust the temperature of the hot primary air; the hot primary air flow control system includes a hot primary air bypass air duct and a flow adjustment device communicated with the air cavity for adjusting the inlet air. The hot primary air volume and exhaust gas temperature of the coal mill.

Description

A hot-air heating system and method for composite heat transfer to synergistically control the adaptability of wide coal types

technical field

The application belongs to the technical field of boiler air preheaters, and in particular relates to a hot air heating system and method for controlling the adaptability of wide coal types by composite heat transfer.

Background technique

In the past two years, affected by the supply and demand relationship in the thermal coal market, coal prices have continued to remain high, and the proportion of coal in power generation costs has continued to rise. Under such circumstances, most coal-fired power plants purchase complex fuels in order to reduce power generation costs. Power plants all use blending coal to stabilize coal quality indicators. In order to make the coal quality parameters into the furnace meet the design coal type requirements, many units with originally designed coal quality of anthracite and lean coal are blended with a large amount of bituminous coal or even lignite, resulting in pulverization. The drying output of the system is insufficient, which in turn affects the milling output and the output of the pulverizing system, and the initial ignition and burnout of pulverized coal are affected; some power plants are designed to be low-sulfur bituminous coal, and in order to control costs The water is lean and lean, which leads to the high outlet temperature of the pulverizing system. In order to control the outlet temperature of the coal mill, a large amount of cold air is mixed, resulting in a substantial increase in the exhaust gas temperature. Cross-coal blending of incoming coal quality leads to an increase in the exhaust gas temperature or a low outlet temperature of the coal mill, which leads to an increase in the heat loss of the exhaust gas or the unburned carbon heat loss of the ash and slag, which affects the energy consumption level of the unit. The main reason for the above problems is that the primary air temperature corresponding to the Junkers air preheater cannot be controlled effectively and flexibly, and the hot primary air temperature can only be adjusted by changing the amount of mixed cold air, but this method has a small adjustment range and sacrifices unit efficiency. for the price. Therefore, the traditional Junker-type air preheater heat exchange system has poor self-adjusting ability and poor adaptability to units that frequently change coal types.

The different heat exchange media of the Junker air preheater are arranged in separate silo channels, and the differential pressure between the flue gas side and the air side of the adjacent silo ducts is high, especially the differential pressure between the flue gas and the primary air is as high as 10kPa or more, and the huge pressure difference is difficult to seal. As the energy saving and consumption reduction indicators of the unit become more and more strict, the control requirements for the air leakage rate of the air preheater are also getting higher and higher. 4%, the air leakage rate of the most advanced dredging sealed air preheater is about 3-4%. It can be seen that no matter what sealing measures are adopted, the air leakage problem of the Junker air preheater using rotary heat exchange is inevitable. The flue gas and air of the tubular air preheater can be completely separated, and the air leakage rate can be controlled to be small in theory. Suitable for large capacity units.

In addition, with the increasing environmental protection requirements, dust removal, denitrification and desulfurization equipment has been added to the flue gas system, and the resistance of the flue gas duct is getting higher and higher. The original design resistance is about 1kPa, and the differential pressure of the blocked air preheater is as high as 3.5kPa or more. The blockage of the air preheater reduces the heat exchange efficiency of the heat storage element, and long-term soot blowing in order to control the differential pressure leads to the damage and deformation of the heat storage element. The blockage and air leakage of the air preheater not only affect the output of the three major fans and increase the power consumption of the fans, but also reduce the safety margin of the fan output and endanger the safe operation of the unit.

How to solve the key problems of traditional rotary air preheater such as blockage, high air leakage rate and poor coal adaptability is particularly important for improving the operation performance, operation safety and adaptability of the air preheater. Based on the above situation, it is urgent to invent a hot air heat exchange system with zero or near-zero air leakage, high heat exchange efficiency, and adaptability to a wide range of coal types.

SUMMARY OF THE INVENTION

In view of the above problems, the embodiment of the present application provides a hot air heating system and method for controlling the adaptability of wide coal types by composite heat transfer, which solves the problems of air leakage, blockage and poor adaptability of coal types in the existing Juncker-type air preheater. The technical solution is as follows:

A first aspect of the present application provides a hot air heating system with composite heat transfer and cooperative control of wide coal type adaptability, including a two-silo air preheater body, an independent air preheater body, a hot flue gas flow control system and a hot primary air flow control system system, the two-silo air preheater body is used for heating secondary air, including flue gas passages and secondary air passages arranged at intervals; the above-mentioned independent air preheater body is used for heating primary air, including mutually independent flue gas chambers The hot flue gas flow control system includes a hot flue gas bypass flue and a flow regulating device communicated with the flue gas cavity, and is used to control the delivery to the independent air preheater body. The flow rate of the hot flue gas that heats the primary air is used to adjust the temperature of the hot primary air; the hot primary air flow control system includes a hot primary air bypass air duct and a flow adjustment device communicated with the air cavity for adjusting the inlet air. The hot primary air volume and exhaust gas temperature of the coal mill.

For example, in the hot air heating system of the composite heat transfer and cooperative control of wide coal type adaptability provided by an embodiment, the flue gas channel and the secondary air channel in the two-silo air preheater body are crossed Cross-spaced arrangement.

For example, in the hot air heating system of the composite heat transfer cooperatively controlling the adaptability of wide coal types provided in an embodiment, a heat exchange unit module is provided in the independent air preheater body, and the heat exchange unit module includes The high temperature heat exchange unit group, the medium temperature heat exchange unit group and the low temperature heat exchange unit group are arranged in order from upstream to downstream of the airflow in the independent air preheater body, the high temperature heat exchange unit group, the medium temperature heat exchange unit group Both the unit group and the low-temperature heat exchange unit group include a connected flue gas side heat exchange part and an air side heat exchange part, the flue gas side heat exchange part is located in the flue gas cavity, and the air side heat exchange part is located in the flue gas cavity. In the air cavity, a heat-insulating and sealing partition wall is provided at the junction of the flue gas side heat exchange part and the air side heat exchange part, and between the flue gas cavity and the air cavity.

For example, in the hot air heating system with the composite heat transfer cooperatively controlling wide coal type adaptability provided in an embodiment, the hot flue gas flow control system divides the hot flue gas into two paths, and one passes through the hot flue gas flue. The main pipe conveys hot flue gas to the air preheater body of the two-segment bin, and the hot flue gas is conveyed to the independent air preheater body all the way through the hot flue gas bypass flue. A bypass flue gas automatic adjustment baffle is arranged on the duct, and the bypass flue gas automatic adjustment baffle is used to control the flow of hot flue gas for heating primary air to the independent air preheater body to adjust the temperature of the hot primary air.

For example, in the hot air heating system of the composite heat transfer cooperatively controlling wide coal type adaptability provided by an embodiment, the hot primary air flow control system divides the hot primary air discharged from the air cavity into two paths , all the way through the hot primary air main pipe to deliver the hot primary air to the coal mill, and all the way through the hot primary air bypass air duct to deliver the hot primary air to the boiler, and the hot primary air bypass air duct is provided with a hot primary air The primary air bypass shut-off door and the hot primary air bypass adjustment door are used to adjust the hot primary air volume and exhaust gas temperature entering the coal mill.

For example, in the hot-air heating system for the composite heat transfer and cooperative control of wide-coal adaptability provided in one embodiment, a cold primary air duct and a primary fan are provided at one end of the air cavity to provide air to the air cavity. A cold secondary air duct and a secondary fan are arranged on one side of the two-silo air preheater body to deliver cold primary air to the secondary air passage in the two-silo air preheater body. secondary wind.

For example, in the hot air heating system of the composite heat transfer cooperative control of wide coal type adaptability provided by an embodiment, the heat exchange unit module includes a plurality of heat pipes, and the plurality of heat pipes are fixed by the heat exchange unit box frame A prefabricated assembly module is formed, the flue gas side heat exchange part is the evaporation section of the heat pipe, the air side heat exchange part is the condensation section of the heat pipe, the evaporation section of the heat pipe is a light pipe, and the condensation section of the heat pipe is in the condensation section of the heat pipe. The outer surface of the segment is provided with helical fins.

For example, in the hot air heating system of the composite heat transfer cooperatively controlling wide coal type adaptability provided by an embodiment, the heat exchange unit module is installed obliquely in the independent air preheater body, and the condensation section Higher than the evaporation section, the included angle between the heat exchange unit module and the horizontal direction is 5° to 10°, and the air side heat exchange part of the heat exchange unit module extends out of the air cavity, and the heat exchange unit is exchanged on the air side. A heat-insulating sealing baffle is arranged at the junction of the hot part and the outside air.

For example, in the hot air heating system provided by an embodiment of the composite heat transfer cooperatively controlling the adaptability of a wide range of coal types, a regeneration extraction pipe and The opening and closing core, the outside of the opening and closing core is protected by a nut.

A second aspect of the present application provides a hot-air heating method for composite heat transfer to synergistically control the adaptability of wide coal types:

(1) When the outlet temperature of the coal mill, the opening of the cold air door of the coal mill and the exhaust gas temperature of the primary air side exceed the set range of the system: if the system determines that the temperature of the outlet of the mill is too high, the opening of the cold air door is too large and the primary air side exhaust temperature is too high When the flue gas temperature is high, control the bypass flue gas to automatically adjust the opening of the baffle to a smaller value according to a fixed value. After a certain period of time, the system determines the deviation again, and then adjusts it again until the target parameter is within the set value range; otherwise, control the hot primary air The opening of the bypass door is opened according to a fixed value, and the above process is repeated until the target parameters are within the set value range; Control the opening of the primary fan blades to be small according to a fixed value. After a certain period of time, the system determines the deviation again, and then adjusts it again until the target parameters are within the set value range; otherwise, control the opening of the primary fan to increase according to the fixed value, and repeat the above process. Until the target parameter is in the set value range value;

(2) When the air volume at the mill inlet and the exhaust gas temperature on the secondary air side exceed the set value range of the system, if the system determines that the air volume at the mill inlet is too high and the temperature of the exhaust smoke at the secondary air side is too high, control the primary fan moving blades to close down at the same time. When the moving blades of the secondary fan are opened, the system determines the deviation again after a certain period of time, and then adjusts it again until the target parameters are within the set value range; otherwise, control the moving blades of the primary fan to open large and close the moving blades of the secondary fan, and repeat the above process. , until the target parameter is within the set value range; if the system determines that the air volume at the mill inlet is too high and the exhaust gas temperature on the secondary air side is too low, it controls the bypass flue gas to automatically adjust the baffle to close down and simultaneously close the primary fan moving blade. After a certain period of time, the system judges the deviation again, and then adjusts it again until the target parameters are within the set value range; otherwise, control the bypass flue gas to automatically adjust the baffle to open large, simultaneously open the moving blades of the primary fan, and slightly close the hot primary air bypass. Adjust the door and repeat the above process until the target parameter is within the set value range;

(3) When only the exhaust gas temperature on the secondary air side exceeds the set value range of the system:

If the system determines that the exhaust gas temperature on the secondary air side is too high: when the opening of the hot primary air bypass door is 0, the bypass flue gas automatic adjustment baffle is controlled to open at a fixed value. After a certain period of time, the system determines the deviation again, and then Adjust again until the target parameter is within the set value range; otherwise, control the bypass flue gas automatic adjustment baffle to close down according to the fixed value, synchronously close the hot primary air bypass door slightly, and repeat the above process until the target parameter is in the set value. Value range value; when the opening of the hot primary air bypass door is greater than 0, control the bypass flue gas automatic adjustment baffle to open according to a fixed value, and at the same time slightly open the hot primary air bypass door, after a certain time, the system will determine the deviation again, Then adjust it again until the target parameter is within the set value range; otherwise, control the bypass flue gas automatic adjustment baffle to close down according to the fixed value, and simultaneously close the hot primary air bypass adjustment door slightly, and repeat the above process until the target parameter is in the set value. Fixed value range value.

If the system determines that the exhaust gas temperature on the secondary air side is low: when the opening of the hot primary air bypass door is 0, the automatic adjustment baffle of the bypass flue gas is controlled to be closed according to the fixed value. After a certain period of time, the system determines the deviation again, and then Adjust again until the target parameter is within the set value range; when the opening of the hot primary air bypass door is greater than 0, control the bypass flue gas automatic adjustment baffle to close down according to the fixed value, and at the same time close the hot primary air bypass door slightly. After a certain period of time, the system determines the deviation again, and then adjusts it again until the target parameter is within the set value range;

(4) When only the exhaust gas temperature on the primary air side exceeds the set value range of the system, if the system determines that the exhaust gas temperature on the primary air side is too high, it controls the hot primary air bypass valve to open at a fixed value, and controls the bypass flue gas synchronously. Automatically adjust the baffle to close, and at the same time slightly open the opening of the primary fan blade, slightly close the secondary fan blade opening, after a certain period of time, the system determines the deviation again, and then adjusts it again until the target parameter is within the set value range; On the contrary, control the hot primary air bypass valve to close according to a fixed value, and synchronously close the opening of the primary fan moving blade slightly, and repeat the above process until the target parameter is within the set value range;

(5) When the exhaust gas temperature on the primary air side and the exhaust gas temperature on the secondary air side exceed the set value range of the system, if the system determines that the exhaust gas temperature on the primary air side is high and the exhaust gas temperature on the secondary air side is low, control the side The road flue gas automatic adjustment baffle is closed according to the fixed value, and the hot primary air bypass door is slightly closed. After a certain period of time, the system determines the deviation again, and then adjusts it again until the target parameter is within the set value range; otherwise, control the heat once The air bypass valve is opened according to a fixed value, and the bypass flue gas is automatically adjusted by opening the bypass flue gas in small steps synchronously, and the above process is repeated until the target parameter is within the set value range;

(6) When the exhaust gas temperature on the primary air side and the exhaust gas temperature on the secondary air side exceed the set value range of the system: if the system determines that the exhaust gas temperature on the primary air side is high and the exhaust gas temperature on the secondary air side is low: control the side The road flue gas automatic adjustment baffle is closed according to the fixed value, and the hot primary air bypass door is slightly closed. After a certain period of time, the system determines the deviation again, and then adjusts it again until the target parameter is within the set value range; otherwise, control the heat once The air bypass valve is opened according to a fixed value, and the bypass flue gas automatically adjusts the damper by opening slightly synchronously, and the above process is repeated until the target parameter is within the set value range.

The beneficial effects brought by the hot-air heating system and method for the composite heat transfer cooperative control of wide-coal adaptability of the present application are as follows: the primary and secondary air heating processes in the present application are completed separately, and the primary air heat exchange system adopts an independent chamber The heat transfer is carried out by phase change heat transfer in the inter-heat pipe, and the secondary air heating system adopts the rotation of the two-silo Junker air preheater to complete the heat transfer. Hot air heating system. Among them, the Junkers air preheater is changed from three-part bin to two-part bin. Since the Junkers air preheater is a rotary heat exchange device, the differential pressure on both sides affects its air leakage rate, so it is used to heat the secondary air alone, and the smoke The air passages and the secondary air passages are arranged in a crisscross interval, and the same heat storage element in the three-point bin is heated and continuously exhaled at one time to be alternately heated twice. The comprehensive temperature of the cold end of the air preheater can avoid the problem of corrosion of the cold end of the air preheater; in addition, the differential pressure between the secondary air and the flue gas is about 1/5 of the differential pressure between the primary air and the flue gas side, and the significant reduction of the differential pressure can be significantly reduced The air leakage rate of the air preheater, for the rotary air preheater, basically realizes zero air leakage of the air preheater.

Description of drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the accompanying drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only These are some embodiments of the present application. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings without any creative effort.

Fig. 1 is a schematic diagram of the layout of the hot air heating system of the present application for the composite heat transfer to coordinately control the adaptability of wide coal types;

Figure 2 is a schematic diagram of the distribution of the air preheater cavity in the A-A direction in the A-A direction;

3 is a schematic diagram of a heat exchange unit module of the present application;

4 is a schematic structural diagram of the high-vacuum regeneration heat pipe of the present application;

5 is a schematic diagram of the arrangement of the high-vacuum regenerative heat pipe of the present application;

FIG. 6 is a schematic diagram of the cooperative control logic system of the hot air heating system of the present application for the composite heat transfer cooperative control of wide coal type adaptability.

Reference numerals: 1- The main body of the air preheater of the two-division warehouse, 2- The hot secondary air duct, 3- The main pipe of the hot flue gas flue, 4- The air duct of the cold secondary air, 5- The outlet smoke of the air preheater body of the two-division warehouse 6- hot flue gas bypass flue, 7- bypass flue gas automatic adjustment baffle, 8- high temperature heat exchange unit group flue gas side heat exchange part, 9- medium temperature heat exchange unit group flue gas side heat exchange part , 10 - low temperature heat exchange unit group flue gas side heat exchange part, 11 - high temperature heat exchange unit group air side heat exchange part, 12 - medium temperature heat exchange unit group air side heat exchange part, 13 - low temperature heat exchange unit group air side Heat exchange part, 14-insulation sealing partition wall, 15-bypass flue outlet, 16-cold primary air duct, 17- primary fan, 18-hot primary air main pipe, 19-flue gas cavity, 20-air cavity body, 21- secondary fan, 22- induced draft fan, 23- heat exchange unit box frame, 24- heat exchange unit module, 25- fixed baffle, 26- adiabatic sealing baffle, 27- low flow resistance high vacuum regeneration Heat pipe, 28-flue gas side heat exchange part, 29-air side heat exchange part, 30-spiral fin, 31-regeneration lead-out pipe, 32-nut, 33-opening and closing core, 34-dust collector, 35-heat Primary air bypass shut-off door, 36-hot primary air bypass adjustment door, 37- hot primary air bypass duct.

Detailed ways

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

Unless otherwise defined, technical or scientific terms used in this disclosure shall have the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. As used in this disclosure, "first," "second," and similar terms do not denote any order, quantity, or importance, but are merely used to distinguish the various components. "Comprises" or "comprising" and similar words mean that the elements or things appearing before the word encompass the elements or things recited after the word and their equivalents, but do not exclude other elements or things. Words like "connected" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "Down", "Left", "Right", etc. are only used to represent the relative positional relationship, and when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

The first aspect of the present application provides a hot air heating system with composite heat transfer and cooperative control of wide coal type adaptability, as shown in Figures 1-2, including a two-silo air preheater body 1, an independent air preheater body, a hot flue gas The flow control system and the hot primary air flow control system, the two-silo air preheater body 1 includes a flue gas channel and a secondary air channel arranged at intervals for heating the secondary air; the independent air preheater body includes a mutual The independent flue gas cavity 19 and the air cavity 20 are used to heat the primary air; the hot flue gas flow control system includes the hot flue gas bypass flue 6 communicated with the flue gas cavity 19 and the flow adjustment The device is used to control the flow of hot flue gas for heating the primary air to the independent air preheater body to adjust the temperature of the hot primary air; the hot primary air flow control system includes a The hot primary air bypass air duct 37 and the flow adjustment device are used to adjust the hot primary air volume and exhaust gas temperature entering the coal mill.

According to the above embodiment, the flue gas for heating the primary air and for heating the secondary air is arranged separately through the hot flue gas bypass flue 6, the heating process of the primary air and the secondary air are completed separately, and the primary air heat exchange system adopts the independent inter-chamber heat pipe phase. The heat transfer is carried out by variable heat transfer. The secondary air heating system adopts the rotation of the two-silo Junker air preheater to complete the heat transfer. .

For example, in the hot air heating system provided by an embodiment of the compound heat transfer cooperatively controlling the adaptability of a wide range of coal types, as shown in FIG. The secondary air passages are arranged in a crisscross pattern. According to the above embodiment, the Junkers air preheater is a two-silo type, which is used to heat the secondary air alone, and the flue gas passage and the secondary air passage are arranged in a crisscross interval, and the heating method is continuously discharged by the primary heating of the three-silo. The heat is changed to a heat exchange mode that alternately heats twice and releases heat twice; in addition, there is no primary air in the Junker air preheater, and the differential pressure between the secondary air and the flue gas is about 1/1 of the differential pressure between the primary air and the flue gas side. 5. The significant reduction of differential pressure can significantly reduce the air leakage rate of the air preheater. Hard seal or soft seal can achieve better air leakage control effect. For the rotary air preheater, zero air leakage of the air preheater is basically realized.

For example, in the hot air heating system provided by an embodiment of the composite heat transfer cooperatively controlling the adaptability of wide coal types, as shown in Figures 1-4, a heat exchange unit module is provided in the independent air preheater body 24. The heat exchange unit module 24 includes a high temperature heat exchange unit group, a medium temperature heat exchange unit group and a low temperature heat exchange unit group, which are arranged in order from upstream to downstream in the air flow in the independent air preheater body. The high temperature heat exchange unit group, the medium temperature heat exchange unit group and the low temperature heat exchange unit group all include a connected flue gas side heat exchange part 28 and an air side heat exchange part 29, and the flue gas side heat exchange part 28 is located in the In the flue gas cavity 19, the air side heat exchange part 29 is located in the air cavity 20, at the junction of the flue gas side heat exchange part 28 and the air side heat exchange part 29, and the A heat-insulating and sealing partition wall 14 is provided between the flue gas cavity 19 and the air cavity 20 . According to the above embodiment, the heat pipe heat exchange unit module 24 is arranged in the main body of the independent air preheater that heats the primary air alone, and the phase change heat transfer heating of the high, medium and low temperature heat pipes is used in the independent cavity where the flue gas and the primary air are completely isolated. The primary air can realize zero air leakage on the primary air side, and at the same time adjust the flue gas flow of the hot flue gas bypass flue 6 according to the outlet temperature of the coal mill, so as to meet the requirements of controllable and adjustable hot primary air temperature without cold air mixing.

As shown in Figures 1-4, the high temperature heat exchange unit group is arranged in the upper part of the independent air preheater body, the medium temperature heat exchange unit group is arranged in the middle of the independent air preheater body, the The low temperature heat exchange unit group is arranged at the lower part of the independent air preheater body. According to the above embodiment, the flue gas cavity 19 and the air cavity 20 in the independent air preheater body are separated by the double-layer heat-insulating sealing partition wall 14, which can ensure zero air leakage on the flue gas side and the air side of the air preheater.

Specifically, as shown in FIGS. 1-4 , the flue gas side heat exchange part 8 of the high temperature heat exchange unit group, the flue gas side heat exchange part 9 of the medium temperature heat exchange unit group and the The flue gas side heat exchange part 10 of the low temperature heat exchange unit group; the air side heat exchange part 11 of the high temperature heat exchange unit group, the air side heat exchange part 12 of the medium temperature heat exchange unit group and the low temperature heat exchange unit group are arranged in order from top to bottom in the air cavity 20 The air side heat exchange part 13 of the heat exchange unit group, wherein the high temperature heat exchange unit group air side heat exchange part 8 in the flue gas cavity 19 and the high temperature heat exchange unit group flue gas side heat exchange in the air cavity 20 The air side heat exchange part 9 of the intermediate temperature heat exchange unit group in the flue gas cavity 19 and the flue gas side heat exchange part 12 of the intermediate temperature heat exchange unit group in the air cavity 20 are integrated structure, so The air-side heat exchange portion 10 of the low-temperature heat exchange unit group in the flue gas cavity 19 and the flue gas-side heat exchange portion 13 of the low-temperature heat exchange unit group in the air cavity 20 are integral structures.

For example, in the hot air heating system provided by an embodiment of the composite heat transfer cooperatively controlling the adaptability of wide coal types, as shown in FIG. 1 , the hot flue gas flow control system divides the hot flue gas into two paths, one path The hot flue gas is transported to the two-silo air preheater body 1 through the hot flue gas flue main pipe 3, and the hot flue gas is transported to the independent air preheater body through the hot flue gas bypass flue 6 all the way. The hot flue gas bypass flue 6 is provided with a bypass flue gas automatic adjustment baffle 7, and the bypass flue gas automatic adjustment baffle 7 controls the delivery of heated primary air to the independent air preheater body The flow rate of the hot flue gas is adjusted to adjust the temperature of the hot primary air; according to the above embodiment, by changing the opening of the bypass flue gas automatic adjustment baffle 7 to adjust the amount of flue gas that heats the primary air, thereby adjusting the temperature of the hot primary air.

For example, in an embodiment of the composite heat transfer cooperating control hot air heating system with wide coal type adaptability, as shown in FIG. 1 , the hot primary air flow control system will discharge air from the air cavity 20 The hot primary air is divided into two paths, one way is to convey the hot primary air to the coal mill through the hot primary air main pipe 18, and the other way is to convey the hot primary air to the boiler through the hot primary air bypass air duct 37. The primary air bypass air duct 37 is provided with a hot primary air bypass shut-off door 35 and a hot primary air bypass adjustment door 36 to adjust the amount of hot primary air entering the coal mill and the temperature of exhaust smoke. According to the above embodiment, the air volume entering the hot primary bypass 37 is adjusted through the hot primary air bypass shut-off door 35 and the regulating door 36, and then the hot primary air volume entering the coal mill is adjusted.

The hot air heating system of the present application with composite heat transfer cooperative control and wide coal type adaptability includes a hot flue gas flow control system and a hot primary air flow control system. By adjusting the hot primary air bypass valve 36 in the hot primary air flow control system and the The hot primary air bypass shut-off door 35 is used to adjust the primary air volume and exhaust gas temperature; by adjusting the bypass flue gas automatic adjustment baffle 7 set on the hot flue gas bypass flue 6 of the hot flue gas flow control system, Control the amount of hot flue gas for heating the primary air, and adjust the flow rate of the primary air for heating according to the outlet temperature of the coal mill, the opening of the cold air door and the exhaust gas temperature. By adjusting the flue gas volume of the hot flue gas bypass flue 6 and the hot primary air volume of the hot primary air bypass air duct 37, the primary air volume and air temperature of the incoming grinding heat can be adjusted, so as to adapt to different coal qualities and the inlet air temperature of the coal mill. In addition, the exhaust gas temperature of the bypass flue outlet 15 and the air preheater outlet flue 5 can be adjusted, and flexible control can be performed according to the comprehensive temperature of the cold end and the resistance of the air preheater. The amount of flue gas for heating primary air and heating secondary air.

For example, in the hot air heating system provided in an embodiment of the compound heat transfer cooperatively controlling the adaptability of wide coal types, as shown in FIG. 1 , one end of the air cavity 20 is provided with a cold primary air duct 16 and a primary A fan 17 is used to deliver cold primary air to the air cavity 20, and a cold secondary air duct 4 and a secondary fan 21 are provided on one side of the two-division warehouse air preheater body 1 to provide air to the two-division warehouse. The secondary air passage in the preheater body 1 conveys cold secondary air.

For example, in the hot air heating system provided by an embodiment of the composite heat transfer cooperatively controlling the adaptability of wide coal types, as shown in FIGS. 3-4 , the heat exchange unit module 24 includes a plurality of heat pipes 27, and a plurality of The heat pipe 27 is fixed by the heat exchange unit box frame 23 to form a prefabricated assembly module, the flue gas side heat exchange part 28 is the evaporation section of the heat pipe 27, the air side heat exchange part 29 is the condensation part of the heat pipe 27 The evaporation section of the heat pipe 27 is a light pipe, and the outer surface of the condensation section of the heat pipe 27 is provided with spiral fins 30 .

Wherein, the high temperature heat exchange unit group is composed of high temperature heat pipes, the medium temperature heat exchange unit group is composed of medium temperature heat pipes, and the low temperature heat exchange unit group is composed of low temperature heat pipes. The heat pipes 27 in the high temperature heat exchange unit group, the medium temperature heat exchange unit group and the low temperature heat exchange unit group of the present application are high vacuum regeneration heat pipes. For precision pipes, the internal medium includes corrosion inhibitor, corrosion inhibitor, hydrogen absorbing agent and heat exchange medium. The heat exchange medium is different according to the heat exchange temperature. The high-vacuum regenerative heat pipes in different heat exchange units are suitable for different temperature ranges. The heat pipes in the high temperature heat exchange unit group are suitable for a temperature range of 300℃-420℃, and the heat pipes in the medium temperature heat exchange unit group are suitable for a temperature range of 180℃-300℃. , the applicable temperature range of the heat pipe in the low temperature heat exchange unit group is 80℃-180℃.

As shown in Figures 3-4, the junction of the heat exchange part 28 on the flue gas side and the heat exchange part 29 on the air side of the heat pipe 27 is fixed by a double-layer heat-insulating sealing partition wall 14, and the two ends of the heat pipe 27 are arranged in a free expansion manner. The two ends of the heat pipe 27 can expand freely while ensuring that the thermal insulation and sealing partition wall 14 is sealed against air leakage.

According to the above embodiment, by arranging the spiral fins 30 on the outer surface of the air side heat exchange part 29 of the heat pipe 27, that is, the outer surface of the condensation section, the air side heat exchange area is increased, the length of the air side heat pipe is reduced, and the on-site arrangement is facilitated; the heat pipe 27 The heat exchange part 28 on the flue gas side, that is, the evaporation section, is a light pipe, which can effectively avoid flue gas blockage and cold end corrosion.

According to the above embodiment, the heat exchange unit module 24 is fixed by the heat exchange unit box frame 23 to form a prefabricated assembly module. During installation, it is only necessary to stack different heat exchange units in the independent air preheater body in sequence, and the installation is fast. Conveniently, the heat exchange unit frame 23 is connected with the outer shell of the independent air preheater body by welding, and the number of high, medium and low temperature heat exchange units is arranged according to design requirements.

The purpose of the flue gas cavity 19 and the air cavity 20 and the heat exchange unit module 24 arranged in the present application is to heat the primary air. The mutually independent flue gas cavity 19 and the air cavity 20 utilize the principle of heat pipe phase change heat transfer, and the heat pipe 27 arranged in the flue gas cavity 19 absorbs the heat of the hot flue gas, so that the heat pipe in the flue gas cavity 19 The liquid heat-conducting medium in 27 absorbs heat and evaporates to the condensation section of the heat pipe 27 in the primary air side air cavity 20. After exothermic condensation, it returns to the evaporation section of the heat pipe 27 in the flue gas cavity 19. The medium in the heat pipe absorbs heat and releases heat through the cycle. The thermal cycle completes the purpose of heating the primary air by the flue gas.

For example, in the hot air heating system provided by an embodiment of the composite heat transfer cooperatively controlling the adaptability of a wide range of coal types, as shown in FIG. 3 , the heat exchange unit module 24 is installed obliquely on the independent air preheater body and the condensation section is higher than the evaporation section, the included angle between the heat exchange unit module 24 and the horizontal direction is 5° to 10°, and the air-side heat exchange portion 29 of the heat exchange unit module 24 protrudes from the Outside the air cavity 20, a heat-insulating sealing baffle 26 is provided at the interface between the air-side heat exchange portion 29 and the outside air. According to the above embodiment, by arranging the heat-insulating sealing baffle 26 at the interface between the air-side heat exchange part 29 of the heat-exchanging unit module 24 and the outside air, it is ensured that there is no air leakage between the heat-exchanging unit module 24 and the outside world. The joint action of the sealing partition wall 14 can realize zero air leakage of the air preheater; by installing the heat exchange unit module 24 obliquely, and the installation angle is 5°-10°, the heat exchange efficiency of the heat pipe is high within the angle range. , On-site installation requires less space and is not easily limited by on-site space.

For example, in the hot air heating system provided by an embodiment of the composite heat transfer and cooperative control of wide coal type adaptability, as shown in FIG. 4 , the air side heat exchange part 29 extends out of the air cavity 20 The end of the valve is provided with a regeneration lead-out pipe 31 and an opening and closing core 33, and the outside of the opening and closing core 33 is protected by a nut 32. According to the above embodiment, by arranging the regeneration outlet pipe 31 and the opening and closing core 33 at the head of the air-side heat exchange part 29, and the regeneration outlet pipe 31 and the opening and closing core 33 are located outside the air cavity 20, it is possible to ensure that the unit is running during the operation. The failure detection of the heat pipe and the regeneration operation after failure are carried out. The outside of the opening and closing core 33 is protected by the nut 32, which can prevent the heat pipe from leaking.

For example, in the hot air heating system provided by an embodiment of the composite heat transfer cooperatively controlling the adaptability of a wide range of coal types, as shown in FIGS. 3-5 , several blocks are arranged at intervals on the heat exchange unit box frame 23 The partition plate 25 is fixed to support the heat pipes 27. The heat pipes 27 in the heat exchange unit module 24 include round pipes and elliptical pipes, and two adjacent ones in the high temperature heat exchange unit group and the medium temperature heat exchange unit group The distance between the heat pipes is 8mm-16mm, and the distance between two adjacent heat pipes in the low temperature heat exchange unit group is 10mm-20mm. According to the above embodiment, several fixed partitions 25 are arranged at intervals on the heat exchange unit box frame 23 to support the heat pipe 27 without deformation, and at the same time play the role of equalizing and rectifying the flue gas flow; . The heat pipes of the low-temperature heat exchange unit are arranged at centimeter-level spacing, and the spacing between the heat pipes in different heat exchange units is differentiated, which not only ensures the flexibility of heat exchange and small space layout, but also prevents the cold end of the air preheater from being blocked. And low temperature corrosion occurs due to the low temperature of the cold end caused by clogging.

Figure 5 shows a schematic diagram of the arrangement of the low flow resistance high vacuum regenerative heat pipe.

The working principle of the wide-adjustment ratio air preheater utilizing heat pipe heat exchange of the present application is as follows: with reference to FIG. The air side heat exchange part 13 of the heat unit group, the air side heat exchange part 12 of the medium temperature heat exchange unit group and the air side heat exchange part 11 of the high temperature heat exchange unit group are heated and enter the hot primary air main pipe 18; a part of the flue gas passes through the hot smoke The gas flue enters the flue in the air preheater body 1 of the two-segment warehouse and exchanges heat with the secondary air, and then enters the outlet flue 5 of the air preheater body of the two-segment warehouse, and the other part enters the hot flue gas bypass flue 6, and then passes through the flue gas in sequence. The flue gas side heat exchange part 8 of the high temperature heat exchange unit group, the flue gas side heat exchange part 9 of the medium temperature heat exchange unit group and the flue gas side heat exchange part 10 of the low temperature heat exchange unit group in the gas cavity 19 discharge heat and then enter the bypass The flue outlet 15 finally enters the cold flue, and then passes through the dust collector 34 and the induced draft fan 22, wherein the amount of flue gas entering the hot flue gas bypass flue 6 can be controlled by the bypass flue gas automatic adjustment baffle 7 to achieve The purpose of adjusting the hot primary air at the inlet of the coal mill improves the adaptability of the pulverizing system to the coal quality.

In the hot air heat exchange system of the present application, which utilizes composite heat transfer collaborative control to realize wide coal type adaptability, the primary and secondary air heating processes are completed separately, and the primary air heat exchange system uses independent inter-chamber heat pipe phase change heat transfer for heat transfer, The secondary air heating system adopts the two-silo Junker air preheater to rotate to complete the heat transfer, and the flue gas for heating the primary and secondary air is arranged with a dedicated flue to realize an independent and coordinated hot air heating system. Among them, the Junkers air preheater is changed from three-part bin to two-part bin. Since the Junkers air preheater is a rotary heat exchange device, the differential pressure on both sides affects its air leakage rate, so it is used to heat the secondary air alone, and the smoke The air passages and the secondary air passages are arranged in a crisscross interval, and the same heat storage element in the three-point bin is heated and continuously exhaled at one time to be alternately heated twice. The comprehensive temperature of the cold end of the air preheater can avoid the problem of corrosion of the cold end of the air preheater; in addition, the differential pressure between the secondary air and the flue gas is about 1/5 of the differential pressure between the primary air and the flue gas side, and the significant reduction of the differential pressure can be significantly reduced The air leakage rate of the air preheater, for the rotary air preheater, basically realizes zero air leakage of the air preheater.

The second aspect of the present application provides a method for a hot-air heating system with composite heat transfer and synergistic control of wide coal-type adaptability, in conjunction with accompanying drawing 6:

(1) When the outlet temperature of the coal mill, the opening of the cold air door of the coal mill and the exhaust gas temperature of the primary air side exceed the set range of the system: if the system determines that the temperature of the outlet of the mill is too high, the opening of the cold air door is too large and the primary air side exhaust temperature is too high When the flue gas temperature is high, control the bypass flue gas to automatically adjust the opening of baffle 7 to a smaller value according to a fixed value. After a certain period of time, the system determines the deviation again, and then adjusts it again until the target parameter is within the set value range; otherwise, control the heat once The opening of the air bypass door 36 is opened according to the fixed value, and the above process is repeated until the target parameter is within the set value range; When the setting value is set, control the opening of the primary fan 17 to be small according to a fixed value. After a certain period of time, the system determines the deviation again, and then adjusts it again until the target parameter is within the set value range; on the contrary, control the opening of the primary fan 17 to open according to the fixed value. , repeat the above process until the target parameter is within the set value range;

(2) When the air volume at the mill inlet and the exhaust gas temperature at the secondary air side exceed the set value range of the system, if the system determines that the air volume at the mill inlet is too high and the exhaust temperature at the secondary air side is too high, control the moving blade of the primary fan 17 to close down. At the same time, the moving blades of the secondary fan 21 are opened large. After a certain period of time, the system determines the deviation again, and then adjusts it again until the target parameter is within the set value range; on the contrary, control the moving blades of the primary fan 17 to open and close the moving blades of the secondary fan 21. , repeat the above process until the target parameter is within the set value range; if the system determines that the air volume at the mill inlet is too high and the exhaust gas temperature on the secondary air side is too low, it will control the bypass flue gas to automatically adjust the baffle 7 to close and close simultaneously 17 moving blades of the primary fan, after a certain period of time, the system determines the deviation again, and then adjusts it again until the target parameters are within the set value range; on the contrary, control the bypass flue gas to automatically adjust the baffle 7 to open and simultaneously open the primary fan 17 moving blades, Slightly close the hot primary air bypass gate 36, and repeat the above process until the target parameter is within the set value range;

(3) When only the exhaust gas temperature on the secondary air side exceeds the set value range of the system:

If the system determines that the exhaust gas temperature on the secondary air side is too high: when the opening of the hot primary air bypass door 36 is 0, control the bypass flue gas to automatically adjust the damper 7 to open according to a fixed value, and the system will determine the deviation again after a certain period of time. , and then adjust again until the target parameter is within the set value range; on the contrary, control the bypass flue gas automatic adjustment baffle 7 to close according to the fixed value, and synchronously close the hot primary air bypass adjustment door 36 slightly, repeat the above process until the target The parameter is within the set value range; when the opening of the hot primary air bypass door 36 > 0, control the bypass flue gas automatic adjustment baffle 7 to open according to the fixed value, and at the same time slightly open the hot primary air bypass door 36, a certain After time, the system determines the deviation again, and then adjusts it again until the target parameter is within the set value range; on the contrary, it controls the bypass flue gas automatic adjustment damper 7 to close down according to the fixed value, and synchronously closes the hot primary air bypass adjustment door 36 slightly. Repeat the above process until the target parameter is within the set value range.

If the system determines that the exhaust gas temperature on the secondary air side is low: when the opening degree of the hot primary air bypass door 36 is 0, the automatic adjustment damper 7 of the bypass flue gas is controlled to be closed according to a fixed value, and the system determines the deviation again after a certain period of time. , and then adjust again until the target parameter is within the set value range; when the opening degree of the hot primary air bypass door 36 > 0, control the bypass flue gas automatic adjustment baffle 7 to close according to the fixed value, and at the same time slightly close the hot primary air Bypass gate 36, after a certain period of time, the system determines the deviation again, and then adjusts it again until the target parameter is within the set value range;

(4) When only the exhaust gas temperature on the primary air side exceeds the set value range of the system, if the system determines that the exhaust gas temperature on the primary air side is too high, it controls the hot primary air bypass door 36 to open according to a fixed value, and controls the bypass smoke synchronously. The air automatic adjustment baffle 7 is closed, and at the same time, the opening of the moving blades of the primary fan 17 is slightly opened, and the opening of the moving blades of the secondary fan 21 is slightly closed. After a certain period of time, the system determines the deviation again, and then adjusts it again until the target parameters are set Fixed value range; on the contrary, control the hot primary air bypass gate 36 to close according to the fixed value, and synchronously close the opening of the primary fan 17 to a small degree, and repeat the above process until the target parameter is within the set value range value;

(5) When the exhaust gas temperature on the primary air side and the exhaust gas temperature on the secondary air side exceed the set value range of the system, if the system determines that the exhaust gas temperature on the primary air side is high and the exhaust gas temperature on the secondary air side is low, control the side The road flue gas automatic adjustment baffle 7 is closed according to a fixed value, and the hot primary air bypass door 36 is slightly closed. After a certain period of time, the system determines the deviation again, and then adjusts it again until the target parameter is within the set value range; The hot primary air bypass door 36 is opened according to a fixed value, and the bypass flue gas automatic adjustment baffle 7 is opened synchronously slightly, and the above process is repeated until the target parameter is within the set value range;

(6) When the exhaust gas temperature on the primary air side and the exhaust gas temperature on the secondary air side exceed the set value range of the system: if the system determines that the exhaust gas temperature on the primary air side is high and the exhaust gas temperature on the secondary air side is low: control the side The road flue gas automatic adjustment baffle 7 is closed according to a fixed value, and the hot primary air bypass door 36 is slightly closed. After a certain period of time, the system determines the deviation again, and then adjusts it again until the target parameter is within the set value range; The hot primary air bypass door 36 is opened according to a fixed value, and the bypass flue gas automatic adjustment baffle 7 is opened synchronously slightly, and the above process is repeated until the target parameter is within the set value range.

Although embodiments of the present application have been disclosed for illustrative purposes, those skilled in the art will recognize that various modifications are possible without departing from the scope and spirit of the invention as disclosed in the accompanying claims Modifications, additions and substitutions.

Claims (10)

1. a hot-air heating system of composite heat transfer cooperative control wide coal class adaptability, is characterized in that, comprises: The main body of the air preheater in the two-segment warehouse is used to heat the secondary air, including the flue gas channel and the secondary air channel arranged at intervals; Independent air preheater body, used for heating primary air, including independent flue gas cavity and air cavity; A hot flue gas flow control system, including a hot flue gas bypass flue communicated with the flue gas cavity and a flow adjustment device, used to control the hot flue gas transported to the independent air preheater body for heating primary air flow rate to adjust the hot primary air temperature; and The hot primary air flow control system includes a hot primary air bypass air duct and a flow adjustment device communicated with the air cavity, and is used to adjust the hot primary air volume and exhaust temperature of the coal mill. 2 . The hot air heating system of claim 1 , characterized in that the flue gas passage and the secondary air passage in the two-silo air preheater body are: The criss-cross is arranged at intervals. 3 . The hot-air heating system of claim 1 , wherein the independent air preheater body is provided with a heat exchange unit module, wherein the heat exchange unit module It includes a high temperature heat exchange unit group, a medium temperature heat exchange unit group and a low temperature heat exchange unit group, which are arranged in order from upstream to downstream in the air flow in the independent air preheater body, the high temperature heat exchange unit group, the medium temperature heat exchange unit group Both the heat unit group and the low temperature heat exchange unit group include a connected flue gas side heat exchange part and an air side heat exchange part, the flue gas side heat exchange part is located in the flue gas cavity, and the air side heat exchange part is located in the flue gas cavity. Located in the air cavity, a heat-insulating sealing partition wall is provided at the junction of the flue gas side heat exchange part and the air side heat exchange part, and between the flue gas cavity and the air cavity. 4 . The hot-air heating system of claim 1 , wherein the hot-air heating system of claim 1, wherein the hot-flue gas flow control system divides the hot flue gas into two channels, and one channel passes the hot flue gas smoke. The main pipe conveys hot flue gas to the air preheater body of the two-segment bin, and the hot flue gas is conveyed to the independent air preheater body through the hot flue gas bypass flue all the way, and the hot flue gas is bypassed in the hot flue gas bypass flue. A bypass flue gas automatic adjustment baffle is arranged on the flue, and the bypass flue gas automatic adjustment baffle is used to control the flow rate of the hot flue gas for heating the primary air to the independent air preheater body to adjust the temperature of the hot primary air . 5 . The hot-air heating system according to claim 1 , wherein the hot-air heating system of claim 1, wherein the hot primary air flow control system divides the hot primary air discharged from the air cavity into two parts. All the way, the hot primary air is sent to the coal mill through the hot primary air main pipe, and the hot primary air is sent to the boiler through the hot primary air bypass air duct, and the hot primary air bypass air duct is provided with The hot primary air bypass shut-off door and the hot primary air bypass adjustment door are used to adjust the hot primary air volume and exhaust gas temperature entering the coal mill. 6 . The hot-air heating system according to claim 1 , characterized in that, a cold primary air duct and a primary fan are arranged at one end of the air cavity, so as to supply the air to the air. The cavity conveys cold primary air, and a cold secondary air duct and a secondary fan are arranged on one side of the two-silo air preheater body to deliver the cold secondary air to the secondary air passage in the two-silo air preheater body. Cold secondary air. 7 . The hot-air heating system of claim 3 , wherein the heat exchange unit module comprises a plurality of heat pipes, and the plurality of heat pipes pass through the heat exchange unit box frame. 8 . Fixed to form a prefabricated assembly module, the flue gas side heat exchange part is the evaporation section of the heat pipe, the air side heat exchange part is the condensation section of the heat pipe, the evaporation section of the heat pipe is a light pipe, and the heat exchange part of the heat pipe is a light pipe. The outer surface of the condensation section is provided with spiral fins. 8 . The hot-air heating system of claim 7 , characterized in that the heat exchange unit module is installed obliquely in the independent air preheater body, and the condensation The section is higher than the evaporation section, the angle between the heat exchange unit module and the horizontal direction is 5-10°, and the air side heat exchange part of the heat exchange unit module extends out of the air cavity, and the heat exchange part on the air side extends out of the air cavity. A heat-insulating sealing baffle is arranged at the interface between the heat exchange part and the outside air. 9 . The hot air heating system of claim 8 , characterized in that a regeneration outlet pipe is provided at the end of the air-side heat exchange part extending out of the air cavity. And the opening and closing core, the outside of the opening and closing core is protected by the nut. 10. According to the method for the hot air heating system of the composite heat transfer cooperatively controlling the adaptability of wide coal types according to any one of claims 1-9, it is characterized in that: (1) When the outlet temperature of the coal mill, the opening of the cold air door of the coal mill and the exhaust gas temperature of the primary air side exceed the set range of the system: if the system determines that the temperature of the outlet of the mill is too high, the opening of the cold air door is too large and the primary air side exhaust temperature is too high When the flue gas temperature is high, control the bypass flue gas to automatically adjust the opening of the baffle to a smaller value according to a fixed value. After a certain period of time, the system determines the deviation again, and then adjusts it again until the target parameter is within the set value range; otherwise, control the hot primary air The opening of the bypass door is opened according to a fixed value, and the above process is repeated until the target parameters are within the set value range; Control the opening of the primary fan blades to be small according to a fixed value. After a certain period of time, the system determines the deviation again, and then adjusts it again until the target parameters are within the set value range; otherwise, control the opening of the primary fan to increase according to the fixed value, and repeat the above process. Until the target parameter is in the set value range value; (2) When the air volume at the mill inlet and the exhaust gas temperature on the secondary air side exceed the set value range of the system, if the system determines that the air volume at the mill inlet is too high and the temperature of the exhaust smoke at the secondary air side is too high, control the primary fan moving blades to close down at the same time. When the moving blades of the secondary fan are opened, the system determines the deviation again after a certain period of time, and then adjusts it again until the target parameters are within the set value range; otherwise, control the moving blades of the primary fan to open large and close the moving blades of the secondary fan, and repeat the above process. , until the target parameter is within the set value range; if the system determines that the air volume at the mill inlet is too high and the exhaust gas temperature on the secondary air side is too low, it controls the bypass flue gas to automatically adjust the baffle to close down and simultaneously close the primary fan moving blade. After a certain period of time, the system judges the deviation again, and then adjusts it again until the target parameters are within the set value range; otherwise, control the bypass flue gas to automatically adjust the baffle to open large, simultaneously open the moving blades of the primary fan, and slightly close the hot primary air bypass. Adjust the door and repeat the above process until the target parameter is within the set value range; (3) When only the exhaust gas temperature on the secondary air side exceeds the set value range of the system: If the system determines that the exhaust gas temperature on the secondary air side is too high: when the opening of the hot primary air bypass door is 0, the bypass flue gas automatic adjustment baffle is controlled to open at a fixed value. After a certain period of time, the system determines the deviation again, and then Adjust again until the target parameter is within the set value range; otherwise, control the bypass flue gas automatic adjustment baffle to close down according to the fixed value, synchronously close the hot primary air bypass door slightly, and repeat the above process until the target parameter is in the set value. Value range value; when the opening of the hot primary air bypass door is greater than 0, control the bypass flue gas automatic adjustment baffle to open according to a fixed value, and at the same time slightly open the hot primary air bypass door, after a certain time, the system will determine the deviation again, Then adjust it again until the target parameter is within the set value range; otherwise, control the bypass flue gas automatic adjustment baffle to close down according to the fixed value, and simultaneously close the hot primary air bypass adjustment door slightly, and repeat the above process until the target parameter is in the set value. Fixed value range value. If the system determines that the exhaust gas temperature on the secondary air side is low: when the opening of the hot primary air bypass door is 0, the automatic adjustment baffle of the bypass flue gas is controlled to be closed according to the fixed value. After a certain period of time, the system determines the deviation again, and then Adjust again until the target parameter is within the set value range; when the opening of the hot primary air bypass door is greater than 0, control the bypass flue gas automatic adjustment baffle to close down according to the fixed value, and at the same time close the hot primary air bypass door slightly. After a certain period of time, the system determines the deviation again, and then adjusts it again until the target parameter is within the set value range; (4) When only the exhaust gas temperature on the primary air side exceeds the set value range of the system, if the system determines that the exhaust gas temperature on the primary air side is too high, it controls the hot primary air bypass valve to open at a fixed value, and controls the bypass flue gas synchronously. Automatically adjust the baffle to close, and at the same time slightly open the opening of the primary fan blade, slightly close the secondary fan blade opening, after a certain period of time, the system determines the deviation again, and then adjusts it again until the target parameter is within the set value range; On the contrary, control the hot primary air bypass valve to close according to a fixed value, and synchronously close the opening of the primary fan moving blade slightly, and repeat the above process until the target parameter is within the set value range; (5) When the exhaust gas temperature on the primary air side and the exhaust gas temperature on the secondary air side exceed the set value range of the system, if the system determines that the exhaust gas temperature on the primary air side is high and the exhaust gas temperature on the secondary air side is low, control the side The road flue gas automatic adjustment baffle is closed according to the fixed value, and the hot primary air bypass door is slightly closed. After a certain period of time, the system determines the deviation again, and then adjusts it again until the target parameter is within the set value range; otherwise, control the heat once The air bypass door is opened according to a fixed value, and the bypass flue gas is automatically adjusted by opening the bypass flue gas in small steps synchronously. Repeat the above process until the target parameter is within the set value range; (6) When the exhaust gas temperature on the primary air side and the exhaust gas temperature on the secondary air side exceed the set value range of the system: if the system determines that the exhaust gas temperature on the primary air side is high and the exhaust gas temperature on the secondary air side is low: control the side The road flue gas automatic adjustment baffle is closed according to the fixed value, and the hot primary air bypass door is slightly closed. After a certain period of time, the system determines the deviation again, and then adjusts it again until the target parameter is within the set value range; The air bypass valve is opened according to a fixed value, and the bypass flue gas automatically adjusts the damper by opening slightly synchronously, and the above process is repeated until the target parameter is within the set value range.

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