CN114135891A - A flue gas heat storage system for stabilizing inlet flue gas parameters of waste heat boilers - Google Patents
A flue gas heat storage system for stabilizing inlet flue gas parameters of waste heat boilers Download PDFInfo
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- CN114135891A CN114135891A CN202111650873.3A CN202111650873A CN114135891A CN 114135891 A CN114135891 A CN 114135891A CN 202111650873 A CN202111650873 A CN 202111650873A CN 114135891 A CN114135891 A CN 114135891A
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 168
- 239000003546 flue gas Substances 0.000 title claims abstract description 168
- 238000005338 heat storage Methods 0.000 title claims abstract description 118
- 239000002918 waste heat Substances 0.000 title claims abstract description 114
- 230000000087 stabilizing effect Effects 0.000 title claims abstract description 16
- 238000004519 manufacturing process Methods 0.000 claims abstract description 17
- 230000005611 electricity Effects 0.000 claims abstract description 6
- 230000001105 regulatory effect Effects 0.000 claims description 44
- 238000010438 heat treatment Methods 0.000 claims description 16
- 238000004891 communication Methods 0.000 claims description 8
- 239000007789 gas Substances 0.000 claims description 8
- 238000012423 maintenance Methods 0.000 claims description 7
- 239000000779 smoke Substances 0.000 description 9
- 238000000034 method Methods 0.000 description 7
- 230000008569 process Effects 0.000 description 7
- 230000009471 action Effects 0.000 description 5
- 230000009467 reduction Effects 0.000 description 5
- 238000007599 discharging Methods 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000013024 troubleshooting Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/06—Arrangements of devices for treating smoke or fumes of coolers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F27/00—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/30—Technologies for a more efficient combustion or heat usage
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/14—Thermal energy storage
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- General Engineering & Computer Science (AREA)
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Abstract
本发明公开了一种用于稳定余热锅炉入口烟气参数的烟气储热系统，包括电加热器、储热装置、余热锅炉，在峰电时段内储热装置进行放热时：储热装置用于对进入其内的烟气进行加热，并将加热后的烟气输送至余热锅炉内，稳定进入余热锅炉内的烟气的温度，提高余热锅炉的热效率；在谷电时段内储热装置进行吸热时：电加热器用于对进入其内的高温烟气进行加热，储热装置用于吸收进入其内的高温烟气的热量，该通路用于稳定进入余热锅炉内的烟气气量，提高余热锅炉的产能；本发明可以稳定余热锅炉入口烟气温度，提高锅炉热效率，延长锅炉使用寿命，经济性高；还可以稳定余热锅炉入口烟气量，提高余热锅炉产能；减少余热锅炉降负荷及停炉时长。
The invention discloses a flue gas heat storage system for stabilizing the inlet flue gas parameters of a waste heat boiler, comprising an electric heater, a heat storage device and a waste heat boiler. It is used to heat the flue gas entering it, and transport the heated flue gas to the waste heat boiler, stabilize the temperature of the flue gas entering the waste heat boiler, and improve the thermal efficiency of the waste heat boiler; heat storage device during the valley electricity period When absorbing heat: the electric heater is used to heat the high-temperature flue gas entering it, and the heat storage device is used to absorb the heat of the high-temperature flue gas entering it. This passage is used to stabilize the amount of flue gas entering the waste heat boiler. The production capacity of the waste heat boiler is improved; the invention can stabilize the inlet flue gas temperature of the waste heat boiler, improve the thermal efficiency of the boiler, prolong the service life of the boiler, and have high economic efficiency; it can also stabilize the inlet flue gas volume of the waste heat boiler, improve the production capacity of the waste heat boiler; reduce the load and reduce the waste heat boiler and shutdown time.
Description
Technical Field
The invention belongs to the field of waste heat recovery and utilization, and particularly relates to a flue gas heat storage system for stabilizing flue gas parameters at an inlet of a waste heat boiler.
Background
Energy conservation and emission reduction are long-term strategic guidelines for economic and social development in China and are extremely urgent tasks. The waste heat recovery and energy consumption reduction have important practical significance for realizing energy conservation, emission reduction and environmental protection development strategy in China, and the heat storage technology has strong competitiveness and huge application prospect.
In the existing flue gas waste heat utilization system, the change of a front-end heat source has great influence on the efficiency of a waste heat boiler, and the heat storage temperature difference can reduce the flue gas temperature at the inlet of the boiler in the heat release stage, so that the heat efficiency and the steam temperature of the boiler are reduced, meanwhile, the flue gas heat is not fully utilized, and when the heat needing to be used is not matched with the heat supply amount, the system has poor energy regulation performance and low economical efficiency.
Disclosure of Invention
The invention aims to provide a flue gas heat storage system for stabilizing flue gas parameters at an inlet of a waste heat boiler, and the flue gas heat storage system is used for solving the problems that the efficiency of the waste heat boiler is greatly influenced by the change of a front-end heat source, the flue gas temperature at the inlet of the boiler is reduced in a heat release stage due to heat storage and release temperature difference, the heat efficiency and the steam temperature of the boiler are reduced, and the utilization of the flue gas heat is insufficient.
The invention adopts the following technical scheme: a flue gas heat storage system for stabilizing flue gas parameters at an inlet of a waste heat boiler comprises an electric heater, a heat storage device and the waste heat boiler,
when the heat storage device releases heat in the peak electricity period:
the flue gas inlet of the waste heat boiler is communicated with the high-temperature flue gas outlet of the production equipment through a collecting pipeline, the smoke exhaust outlet of the waste heat boiler is communicated with the heat storage device through a discharging pipeline and a heat releasing pipeline in sequence, the heat storage device is communicated with the collecting pipeline through a heating pipeline,
the heat storage device is used for heating the flue gas entering the heat storage device and conveying the heated flue gas into the waste heat boiler, so that the temperature of the flue gas entering the waste heat boiler is stabilized, and the heat efficiency of the waste heat boiler is improved;
when the heat storage device absorbs heat in the valley electricity time period:
the inlet of the electric heater is communicated with the collecting pipeline through a pipeline, the outlet of the electric heater is communicated with the inlet of the heat storage device, the outlet of the heat storage device is communicated with the waste heat boiler through a gas filling pipeline,
the electric heater is used for heating high-temperature flue gas entering the electric heater, the heat storage device is used for absorbing heat of the high-temperature flue gas entering the electric heater, and the passage is used for stabilizing the amount of the flue gas entering the waste heat boiler and improving the capacity of the waste heat boiler.
Furthermore, the waste heat boiler is communicated with the outside through a discharge pipeline, an outlet of the heat storage device is also communicated with the discharge pipeline through an overhaul pipeline, and the heat storage device is also used for storing heat during overhaul of the waste heat boiler.
Furthermore, a first flue gate valve is arranged on a collecting pipeline communicated with a high-temperature flue gas outlet of the waste heat boiler and the production equipment;
a third flue gate valve is arranged on an air-entrapping pipeline communicated with the outlet of the heat storage device and the inlet of the waste heat boiler;
a fifth flue gate valve is arranged on a discharge pipeline communicated with the outside of the waste heat boiler;
a sixth flue gate valve is arranged on a pipeline for communicating the inlet of the electric heater with the collecting pipeline;
under the condition that the first flue gate valve, the third flue gate valve, the fifth flue gate valve and the sixth flue gate valve are closed, the heat storage device is used for supplying heat to the waste heat boiler, and then the production equipment is overhauled;
and the fifth flue gate valve is also used for adjusting the flow of flue gas entering the heat storage device.
Further, the air conditioner is provided with a fan,
a second flue gate valve is arranged on the heating pipeline which is communicated with the collection pipeline,
the second flue gate valve is used for adjusting the flue gas volume that the heat-retaining device absorbed was carried to the collection pipeline, and then adjusts the flue gas volume that carries out the heat supply to exhaust-heat boiler.
Further, the air conditioner is provided with a fan,
a fourth flue gate valve is also arranged on the discharge pipeline and is positioned between the fifth flue gate valve and the waste heat boiler;
a seventh flue gate valve is arranged on the maintenance pipeline communicated with the discharge pipeline, the communication point of the maintenance pipeline and the discharge pipeline is positioned between the fifth flue gate valve and the fourth flue gate valve,
and the seventh flue gate valve is used for adjusting the amount of flue gas discharged to the discharge pipeline by the heat storage device.
Furthermore, a first electric control valve is arranged on the heat release pipeline, the communication point of the heat release pipeline and the discharge pipeline is positioned in front of the fifth flue gate valve and behind the communication point of the overhaul pipeline and the discharge pipeline,
the first electric regulating valve is used for regulating the flow of smoke entering the heat storage device.
Further, a second electric regulating valve is arranged on the collecting pipeline; the second electric regulating valve is used for regulating the flow of the flue gas entering the waste heat boiler.
Furthermore, a temperature sensor is further installed on a pipeline of the collecting pipeline close to the waste heat boiler, and the temperature sensor is used for detecting the temperature entering the waste heat boiler and is connected with the electric heater, the first electric regulating valve and the second electric regulating valve in parallel.
The invention has the beneficial effects that: the invention can stabilize the temperature of the flue gas at the inlet of the waste heat boiler, improve the thermal efficiency of the boiler, prolong the service life of the boiler and has high economy; the flue gas amount at the inlet of the waste heat boiler can be stabilized, and the capacity of the waste heat boiler is improved; the load reduction and the furnace shutdown time of the waste heat boiler are reduced; the valley electricity is used for heat storage, so that the operation cost is low; the adjustable range of the flue gas capacity for heat storage is very large, and the applicability is strong; the flue gas temperature of the heat storage device during heat release is improved, and the system capacity is improved; the discharged low-temperature flue gas is recycled, so that energy is saved and consumption is reduced; when the waste heat boiler breaks down, the downtime of the whole system is reduced; the electric heaters are interlocked, and the system is safe and reliable.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Wherein: 1. a heat storage device; 2. a waste heat boiler; 3. an electric heater; 4. a second electric control valve; 5. a first electric control valve; 6. a temperature sensor; 7. a circulating fan; 8. collecting a pipeline; 9. a heat release conduit; 10. heating the pipeline; 11. an air entrainment pipeline; 12. a discharge conduit; 13. overhauling the pipeline; 101. a first flue gate valve; 102. a second flue gate valve; 103. a third flue gate valve; 104. a fourth flue gate valve; 105. a fifth flue gate valve; 106. a sixth flue gate valve; 107. and a seventh flue gate valve.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
The invention discloses a flue gas heat storage system for stabilizing inlet flue gas parameters of a waste heat boiler, which comprises an electric heater 3, a heat storage device 1 and a waste heat boiler 2 as shown in figure 1.
When the heat storage device 1 performs heat release during the peak power period: flue gas inlet of exhaust-heat boiler 2 communicates through the high temperature exhanst gas outlet of gathering pipeline 8 with production facility, exhaust-heat boiler 2's outlet of discharging fume loops through discharge pipe 12, heat release pipeline 9 is linked together with heat-retaining device 1, heat-retaining device 1 is linked together with gathering pipeline 8 through heating pipeline 10, heat-retaining device 1 is used for heating the flue gas that gets into it, and carry the flue gas after will heating to exhaust-heat boiler 2 in, the temperature of the flue gas in the stable exhaust-heat boiler 2 that gets into, improve exhaust-heat boiler 2's thermal efficiency.
When the heat storage device 1 absorbs heat during the valley power period: the inlet of the electric heater 3 is communicated with the collecting pipeline 8 through a pipeline, the outlet of the electric heater 3 is communicated with the inlet of the heat storage device 1, the outlet of the heat storage device 1 is communicated with the waste heat boiler 2 through the gas filling pipeline 11, the electric heater 3 is used for heating high-temperature flue gas entering the electric heater, the heat storage device 1 is used for absorbing heat of the high-temperature flue gas entering the electric heater, and the channel is used for stably entering the flue gas volume in the waste heat boiler 2 and improving the capacity of the waste heat boiler 2.
The waste heat boiler 2 is communicated with the outside through a discharge pipeline 12, an outlet of the heat storage device 1 is also communicated with the discharge pipeline 12 through an overhaul pipeline 13, and the heat storage device 1 is also used for storing heat when the waste heat boiler 2 is overhauled.
A first flue gate valve 101 is arranged on a collecting pipeline 8 which is communicated with a high-temperature flue gas outlet of the production equipment by the waste heat boiler 2; a third flue gate valve 103 is arranged on the gas filling pipeline 11 communicated with the outlet of the heat storage device 1 and the inlet of the waste heat boiler 2; a fifth flue gate valve 105 is arranged on a discharge pipeline 12 communicated with the outside of the waste heat boiler 2; a sixth flue gate valve 106 is arranged on a pipeline for communicating the inlet of the electric heater 3 with the collecting pipeline 8; when the first flue gate valve 101, the third flue gate valve 103, the fifth flue gate valve 105 and the sixth flue gate valve 106 are all closed, the heat storage device 1 is used for supplying heat to the waste heat boiler 2, and then the production equipment is overhauled; the fifth flue gate valve 105 is also used to regulate the flow of flue gas into the heat storage device 1.
A second flue gate valve 102 is installed on a heating pipeline 10, which is communicated with the collection pipeline 8, of the heat storage device 1, and the second flue gate valve 102 is used for adjusting the amount of flue gas transmitted to the collection pipeline 8 by heat absorbed by the heat storage device 1, so as to adjust the amount of flue gas for supplying heat to the waste heat boiler 2.
A fourth flue gate valve 104 is further arranged on the discharge pipeline 12, and the fourth flue gate valve 104 is positioned between the fifth flue gate valve 105 and the waste heat boiler 2; a seventh flue gate valve 107 is mounted on the inspection pipeline 13, which is communicated with the discharge pipeline 12, of the heat storage device 1, a communication point of the inspection pipeline 13 and the discharge pipeline 12 is located between the fifth flue gate valve 105 and the fourth flue gate valve 104, and the seventh flue gate valve 107 is used for adjusting the amount of flue gas discharged to the discharge pipeline 12 from the heat storage device 1.
The first electric adjusting valve 5 is installed on the heat releasing pipeline 9, the communication point of the heat releasing pipeline 9 and the discharge pipeline 12 is located in front of the fifth flue gate valve 105 and behind the communication point of the overhaul pipeline 13 and the discharge pipeline 12, and the first electric adjusting valve 5 is used for adjusting the flow rate of flue gas entering the heat storage device 1. A second electric regulating valve 4 is arranged on the collecting pipeline 8; the second electric regulating valve 4 is used for regulating the flow of the flue gas entering the waste heat boiler 2.
And a temperature sensor 6 is also arranged on the pipeline of the collecting pipeline 8 close to the waste heat boiler 2, and the temperature sensor 6 is used for detecting the temperature entering the waste heat boiler 2 and is connected with the electric heater 3, the first electric regulating valve 5 and the second electric regulating valve 4 in parallel.
A first flue gate valve 101 is arranged on a collecting pipeline 8 communicated with a high-temperature flue gas outlet of the waste heat boiler 2 and production equipment, a fifth flue gate valve 105 is arranged on a discharge pipeline 12 communicated with the outside of the waste heat boiler 2, the first flue gate valve 101 is a high-temperature flue gas inlet valve, and the front end of the first flue gate valve is a hot flue gas production system; the fifth flue gate valve 105 is a low-temperature flue gas outlet valve, and the rear end of the fifth flue gate valve is connected with a low-temperature flue gas using or discharging system.
Because the heat exchange is carried out in the temperature difference state of the smoke and the materials of the heat storage device 1, the smoke temperature is less than the temperature of the heat storage device 1 and less than the high-temperature smoke temperature during heat charging after the heat storage device 1 releases heat, and the heat storage device 1 can generate temperature drop due to heat preservation after the heat charging, so that the electric heater 3 is used for improving the smoke temperature and eliminating the temperature difference and temperature drop influence. Electric heater 3 is adjustable type heater, can be according to 3 export temperature automatically regulated heating power of electric heater to electric heater 3 is from taking safety protection, and when not having the flue gas circulation, electric heater 3 can't open.
Example 1
Interlocking one: electric heater 3 and temperature sensor 6 interlocking, when the reading of temperature sensor 6 was too high, electric heater 3 automatic reduction load reduced flue gas heating temperature.
And (2) interlocking II: the second electric regulating valve 4 is interlocked with the temperature sensor 6, the upper limit working temperature and the lower limit working temperature of the waste heat boiler 2 are set in advance, when the reading of the temperature sensor 6 is larger than the upper limit working temperature, the opening of the second electric regulating valve 4 is reduced, the amount of high-temperature smoke entering the heat storage device 1 is increased, the heat storage device 1 stores heat, and heat waste is avoided; when the reading of the temperature sensor 6 is less than or equal to the lower limit working temperature, the opening of the second electric regulating valve 4 is increased, and the amount of high-temperature flue gas entering the heat storage device 1 is reduced, so that a large amount of high-temperature flue gas enters the waste heat boiler 2.
And (3) interlocking: the first electric regulating valve 5 is interlocked with the temperature sensor 6, and when the reading of the temperature sensor 6 is higher than the upper limit working temperature, the opening of the first electric regulating valve 5 is reduced, so that the low-temperature flue gas entering the heat storage device 1 is reduced; when the reading of the temperature sensor 6 is less than or equal to the lower limit working temperature, the opening of the first electric regulating valve 5 is increased, so that the low-temperature flue gas entering the heat storage device 1 is increased.
The first mode is as follows: in the state of heat preservation after the heat storage device 1 is full
An opening state: a first flue gate valve 101, a fourth flue gate valve 104, and a fifth flue gate valve 105.
And (3) closing state: a second flue gate valve 102, a third flue gate valve 103, and a sixth flue gate valve 106.
Flue gas flow direction: the high-temperature flue gas exchanges heat with the waste heat boiler 2 and is directly discharged through the circulating fan 7.
And a second mode: normal charging operation of the heat storage device 1 during the off-peak period
An opening state: a first flue gate valve 101, a third flue gate valve 103, a fourth flue gate valve 104, a fifth flue gate valve 105, and a sixth flue gate valve 106.
And (3) closing state: a second flue gate valve 102, a seventh flue gate valve 107.
Flue gas flow direction: the high-temperature flue gas enters from the inlet in two ways: one path of flue gas passes through a sixth flue gate valve 106, is heated by an electric heater 3, then exchanges heat with the heat storage device 1, and then flows through a third flue gate valve 103; the other path of flue gas flows through a bypass of the second electric regulating valve 4, the two paths of flue gas are converged at an inlet of the waste heat boiler 2, and then the flue gas is discharged after sequentially passing through the waste heat boiler 2, the fourth flue gate valve 104 and the circulating fan 7.
In the heat charging process of the heat storage device 1, the amount of flue gas entering the heat storage device 1 can be adjusted by adjusting the opening degree of the second electric regulating valve 4, when the flue gas bypassing the heat storage device 1 is heated by the electric heater 3, the flue gas enters the heat storage device 1 for heat exchange, then is converged with the flue gas passing through the second electric regulating valve 4, and then is discharged after sequentially passing through the waste heat boiler 2, the fourth flue gate valve 104, the circulating fan 7 and the fifth flue gate valve 105. If the reading of the temperature sensor 6 is larger than the upper limit working temperature of the boiler, the first interlocking or the second interlocking is carried out, namely the load of the electric heater 3 is reduced or the opening of the second electric regulating valve 4 is increased, and the temperature of the converged flue gas is reduced by reducing the heating temperature or the heated flue gas volume until the temperature of the converged flue gas does not exceed the upper limit working temperature of the boiler. In this mode, the temperature of the heat storage device 1 at the end of charging is higher than the temperature of the high-temperature flue gas of the production equipment, and until the heat release operation is started, the temperature of the heat storage device 1 is still not lower than the temperature of the high-temperature flue gas of the production equipment.
And a third mode: normal heat-releasing operation of the heat storage device 1 during peak or flat periods
An opening state: a first flue gate valve 101, a second flue gate valve 102, a fourth flue gate valve 104, and a fifth flue gate valve 105.
And (3) closing state: a third flue gate valve 103, a sixth flue gate valve 106, and a seventh flue gate valve 107.
Flue gas flow direction: when the heat storage device operates, low-temperature flue gas at the outlet of the circulating fan 7 enters the heat storage device 1 through the first electric regulating valve 5 for heat exchange, flows through the second flue gate valve 102, is converged with high-temperature flue gas of the system, then sequentially passes through the second electric regulating valve 4, the waste heat boiler 2 and the circulating fan 7, the process is repeated on part of the low-temperature flue gas, and the other part of the low-temperature flue gas is directly discharged.
In the initial stage of heat release, because the heat storage temperature of the heat storage device 1 is greater than the temperature of the high-temperature flue gas, if the reading of the temperature sensor 6 is greater than the set value of the upper limit working temperature of the waste heat boiler 2, the three actions of interlocking, namely the opening of the first electric regulating valve 5 is reduced, the mixed flue gas temperature is reduced by reducing the heat exchange flue gas quantity passing through the heat storage device 1 until the reading of the temperature sensor 6 does not exceed the upper limit working temperature of the boiler.
In the last stage of heat release, the heat storage temperature of the heat storage device 1 is lower than the temperature of high-temperature flue gas, if the reading of the temperature sensor 6 is lower than the lower limit working temperature set value of the waste heat boiler 2, three actions of interlocking are carried out, namely the opening of the first electric regulating valve 5 is increased, the temperature of the mixed flue gas is improved by increasing the heat exchange flue gas quantity passing through the heat storage device 1 until the reading of the temperature sensor 6 is not lower than the lower limit working temperature of the boiler.
And a fourth mode: operation of waste heat boiler 2 in case of failure
An opening state: a first flue gate valve 101, a fifth flue gate valve 105, a sixth flue gate valve 106, and a seventh flue gate valve 107.
And (3) closing state: a third flue gate valve 103 and a fourth flue gate valve 104.
Flue gas flow direction: during operation, high-temperature flue gas sequentially passes through the first flue gate valve 101, the sixth flue gate valve 106, the heat storage device 1, the seventh flue gate valve 107 and the fifth flue gate valve 105 and then is discharged until the waste heat boiler 2 is relieved of failure or the heat storage device 1 is fully charged, and the operation mode is ended. When the waste heat boiler 2 breaks down, the operation of the high-temperature flue gas system is not stopped in order to save heat, and the system temperature-rising time and the operation mode of the operation process are reduced when the boiler is started.
And a fifth mode: operation in the event of a fault in a high-temperature flue gas system
An opening state: a second flue gate valve 102, and a fourth flue gate valve 104.
And (3) closing state: a first flue gate valve 101, a third flue gate valve 103, a fifth flue gate valve 105, a sixth flue gate valve 106, and a seventh flue gate valve 107.
Flue gas flow direction: when the high-temperature flue gas system is in operation, the flue gas is pushed by the circulating fan 7 to sequentially pass through the first electric regulating valve 5, the heat storage device 1, the second flue gate valve 102, the second electric regulating valve 4, the waste heat boiler 2 and the fourth flue gate valve 104 and then enter the circulating fan 7 to repeat the circulating action until the high-temperature flue gas system is recovered to be normal or the heat storage amount of the heat storage device 1 is insufficient, and the operation mode is ended. This mode is when high temperature flue gas system breaks down, in order to guarantee exhaust-heat boiler 2 can continue production work, avoids the boiler to stop the operation and bring direct economic loss to and reduce the mode of operation at system troubleshooting back, boiler start-up intensification time and operation process.
Mode six: operation in case of insufficient amount of high-temperature flue gas
An opening state: a first flue gate valve 101, a second flue gate valve 102, a fifth flue gate valve 105, and a fourth flue gate valve 104.
And (3) closing state: a third flue gate valve 103, a sixth flue gate valve 106, and a seventh flue gate valve 107.
Flue gas flow direction: when the flue gas heat recovery device operates, part of the flue gas passes through the first electric regulating valve 5, the heat storage device 1 and the second flue gate valve 102 in sequence under the pushing of the circulating fan 7, then is converged with high-temperature flue gas, then enters the circulating fan 7 through the second electric regulating valve 4, the waste heat boiler 2 and the fourth flue gate valve 104, and then is circulated repeatedly, and part of the flue gas is discharged. The mode is an operation mode when the high-temperature flue gas quantity is too low to meet the normal working requirement of the waste heat boiler 2.
Mode seven: operation when high temperature flue gas temperature exceeds upper limit working temperature of boiler
An opening state: a first flue gate valve 101, a second flue gate valve 102, a fifth flue gate valve 105, a fourth flue gate valve 104, and a third flue gate valve 103.
And (3) closing state: a sixth flue gate valve 106, and a seventh flue gate valve 107.
Flue gas flow direction: during operation, high-temperature flue gas passes through the first flue gate valve 101 and the second flue gate valve 102 in sequence, exchanges heat with the heat storage device 1, then passes through the third flue gate valve 103, is mixed with the high-temperature flue gas, and then passes through the waste heat boiler 2, the fourth flue gate valve 104 and the circulating fan 7 to be discharged. The mode is an operation mode when the temperature of high-temperature flue gas exceeds the upper limit working temperature of the waste heat boiler 2, and when the mode is operated, two actions are interlocked, namely the reading of the temperature sensor 6 is greater than the upper limit working temperature of the boiler, and the opening of the second electric regulating valve 4 is reduced. And stopping the operation mode until the reading of the temperature sensor 6 exceeds the upper limit working temperature of the boiler, closing the system, or stopping the operation mode until the high-temperature flue gas temperature at the inlet of the system is lower than the upper limit safety temperature of the boiler, and recovering the normal operation of the system.
And a mode eight: operation when high temperature flue gas temperature is lower than lower limit working temperature of boiler
An opening state: a first flue gate valve 101, a second flue gate valve 102, a fifth flue gate valve 105, and a fourth flue gate valve 104.
And (3) closing state: a third flue gate valve 103, a sixth flue gate valve 106, and a seventh flue gate valve 107.
Flue gas flow direction: during operation, flue gas at the outlet of the circulating fan 7 enters the heat storage device 1 through the first electric regulating valve 5 for heat exchange, then flows through the second flue gate valve 102 to be converged with high-temperature flue gas of the system, then sequentially passes through the second electric regulating valve 4, the waste heat boiler 2 and the circulating fan 7, the processes are repeated on part of the flue gas, and the other part of the flue gas is directly discharged. During operation, if the reading of the temperature sensor 6 is smaller than the lower limit working temperature set value of the waste heat boiler 2, the three actions of interlocking are carried out, namely the opening of the first electric regulating valve 5 is adjusted to be large, and the temperature of the mixed flue gas is increased by increasing the heat exchange flue gas volume of the heat storage device 1 until the reading of the temperature sensor 6 does not lower than the lower limit working temperature of the boiler. In the process, the electric heater 3 and the sixth flue gate valve 106 can be opened according to actual requirements, and the second flue gate valve 102 is closed, so that the inlet flue gas temperature of the waste heat boiler 2 is increased, and the working efficiency and the working output of the boiler are increased. This mode is an operation mode when the temperature of the heat storage device 1 is higher than the lower limit operating temperature of the exhaust heat boiler 2, and the high temperature flue gas temperature is lower than the lower limit operating temperature of the exhaust heat boiler 2.
The mode nine: heat charging operation during off-peak electricity periods
An opening state: a first flue gate valve 101, a second flue gate valve 102, a fifth flue gate valve 105, a fourth flue gate valve 104, and a third flue gate valve 103.
And (3) closing state: a sixth flue gate valve 106, and a seventh flue gate valve 107.
Flue gas flow direction: when in operation, the high-temperature flue gas enters from the inlet in two ways: one path of flue gas passes through a second flue gate valve 102, exchanges heat with the heat storage device 1, and then flows through a third flue gate valve 103; the other path of smoke bypasses the second electric regulating valve 4. The two paths of flue gas are converged at an inlet of the waste heat boiler 2 and then sequentially pass through the waste heat boiler 2, a fourth flue gate valve 104 and the circulating fan 7 to be discharged. The smoke gas entering the heat storage device 1 is adjusted through the opening degree of the second electric adjusting valve 4. The process can be operated at any time period without affecting the normal operation of the boiler, so that the amount of the hot flue gas can be adjusted at will. This mode is a charging operation mode performed in a state where the heater is not turned on during a flat or peak power period.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent replacements, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
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