CN105042666B - Wide-load heat supply energy-saving system of back pressure type small steam turbine driven draught fan - Google Patents
Wide-load heat supply energy-saving system of back pressure type small steam turbine driven draught fan Download PDFInfo
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Abstract
The invention relates to a wide-load heat supply energy-saving system of a back-pressure small steam turbine driven draught fan, which comprises a main steam turbine, a back-pressure small steam turbine, the draught fan, a boiler reheater, a deaerator and a low-pressure heater, wherein the steam exhaust end of a high-pressure cylinder in the main steam turbine is connected with the steam inlet end of the boiler reheater, one of the steam outlet ends of the boiler reheater is connected with the steam inlet end of a medium-pressure cylinder to form a reheating loop; the second steam outlet end of the boiler reheater is connected with the steam inlet end of the back pressure type small steam turbine to form a heat supply loop; the power output end of the back pressure type small steam turbine is connected with the driving input end of the induced draft fan to form an induced draft fan driving loop; one of the steam outlets of the medium-pressure cylinder is connected with the steam inlet end of the deaerator through a heat-recovery steam extraction pipeline, and the other steam outlet of the medium-pressure cylinder is connected with the steam inlet end of the low-pressure heater through a steam extraction pipeline to form a heat-recovery loop; and a steam extraction and steam supplement structure of a heat supply loop is formed between each connecting pipeline of the low-pressure heater, the condensed water pipeline, the deaerator and the medium-pressure cylinder and the heat supply pipe network. The invention not only improves the economical efficiency of heat supply operation, but also has the advantages of higher operation and adjustment flexibility and better heat supply economical efficiency.
Description
Technical Field
The invention relates to a wide-load heat supply energy-saving system of a back-pressure small steam turbine driven draught fan, which is suitable for heat supply of a thermal power plant. Belongs to the technical field of thermal power generation equipment.
Background
At present, the application of a high-efficiency steam turbine generator unit becomes the key point of electric power optimization configuration, and strict energy-saving and emission-reduction indexes require shutting down small self-contained power plants and heat supply boilers of various enterprises, so that large conventional coal-fired power plants need to have the requirements of peak regulation and heat supply capacity at the same time. For a heat supply unit of a conventional coal-fired thermal power plant, a main thermal system comprises a reheating system, a heat supply system and an induced draft fan system. The reheating system means that exhausted steam after the high-pressure cylinder of the main turbine completes work application enters a boiler reheater to be reheated and enters a medium-pressure cylinder of the main turbine to continue work application, and the efficiency of the thermodynamic system is improved. The heat recovery system is used for extracting steam from each part of a main turbine cylinder in a pressure-division and staged manner to a deaerator or a low-pressure heater to heat condensed water and feed water, so that the operation efficiency of the unit is improved. The heat supply system is used for extracting steam from the middle of a steam turbine cylinder or exhausting steam to supply heat to the outside. The induced draft fan system drives the induced draft fan to boost the boiler smoke through the driving device so as to overcome the resistance of equipment and a flue in the boiler smoke discharging process.
A back pressure turbine is adopted in domestic small-sized pure heat supply thermal power plants mostly, and a heat supply system of the back pressure turbine comprises the back pressure turbine and a steam exhaust heat supply pipeline. The steam inlet source of the back pressure steam turbine is sub-high pressure high temperature steam, generally above 4MPa.g and 450 ℃, so as to maintain certain exhaust pressure to meet the requirement of a heat supply pipe network and obtain higher efficiency of the steam turbine. Because the back pressure steam turbine heat supply unit supplies heat to the outside through the exhaust steam, the heat energy of all steam is completely utilized, no cold end loss exists, and the running heat economy is higher. The back pressure steam turbine heat supply unit is suitable for power plants with stable heat supply loads and has certain limitation in application.
In the prior art, the connection relation of each system of a large-capacity conventional coal-fired power plant heat supply unit is realized. The exhaust steam of a high-pressure cylinder of a main steam turbine enters a boiler reheater, reheated steam enters a middle pressure cylinder of the main steam turbine to do work, a steam inlet steam source of a condensing type small steam turbine of a draught fan is used for extracting steam of the middle pressure cylinder of the main steam turbine, and the exhaust steam is discharged to a condenser to be used as cold end loss to take away latent heat of vaporization of the steam by circulating cooling water. The heat supply steam extraction source is taken from a main steam turbine cylinder or a communicating pipe thereof for extracting steam, and can be adjusted or non-adjusted for steam extraction, heat can be supplied to the outside when the pressure requirement of a heat user is met, and the pressure of the adjusted steam extraction can not be changed along with the load change of the main steam turbine or the load change of a heat supply network.
The heat supply steam source completely extracts steam from a main steam turbine cylinder, and simultaneously extra steam is also required to be extracted to supply a small condensing steam turbine of the induced draft fan as a power driving steam source, and the steam is exhausted to the condenser to form cold end loss, so that the cold end loss is finally formed as the largest component of the thermal performance loss of the power plant.
In the prior art, when the fluctuation of the heat load is large or the demand of a heat supply user is suddenly reduced, a back pressure type steam turbine generator unit is forced to reduce the load for operation, and when the exhaust pressure in a low-load range can not meet the heat supply pressure, the unit is forced to be shut down. In addition, the back pressure turbine must operate at a high load to maintain a stable exhaust heating back pressure, and cannot generate electricity by peak load regulation. The backpressure steam turbine set has the biggest characteristic of high-efficiency stable heat supply and no electric load peak regulation capacity.
Disclosure of Invention
The invention aims to solve the problems that the steam extraction and heat supply economical efficiency of a generator set of the existing condensing steam turbine driving a draught fan is poor, the inherent narrow load operation flexibility of a back pressure steam turbine is poor, the peak regulation energy of an electric load is not available and the like, and provides a high-capacity thermal generator set heat supply thermodynamic system with high-efficiency wide-load heat supply and full-load power grid peak regulation capacity.
The purpose of the invention can be realized by the following technical scheme:
the wide-load heat supply energy-saving system comprises a main steam turbine, a small back-pressure steam turbine, an induced draft fan, a boiler reheater, a deaerator and a low-pressure heater, wherein a high-pressure cylinder and a medium-pressure cylinder are arranged in the main steam turbine, the steam exhaust end of the high-pressure cylinder is connected with the steam inlet end of the boiler reheater through a high-temperature steam exhaust pipe, one of the steam outlet ends of the boiler reheater is connected with the steam inlet end of the medium-pressure cylinder, and a reheating loop is formed; the second steam outlet end of the boiler reheater is connected with the steam inlet end of the small back pressure turbine through a secondary high-temperature steam pipe to form a heat supply loop of the small back pressure turbine; the power output end of the back pressure type small steam turbine is connected with the driving input end of the induced draft fan to form an induced draft fan driving loop; one of the steam outlets of the medium-pressure cylinder is connected with the steam inlet end of the deaerator through a heat-recovery steam extraction pipeline, and the other steam outlet of the medium-pressure cylinder is connected with the steam inlet end of the low-pressure heater through a steam extraction pipeline to form a heat-recovery loop; the water inlet of the low-pressure heater is connected with a condensed water pipeline, and the water outlet of the low-pressure heater is connected with the water inlet end of the deaerator through a condensed water pipeline; the third steam outlet of the medium-pressure cylinder is communicated with a steam extraction pipe, the steam exhaust end of the back-pressure type small steam turbine passes through a heat supply pipe network, the heat supply pipe network is communicated with the steam inlet end of the condenser to form safe starting and accident shutdown of the generator set, and the heat supply pipe network is communicated with the steam extraction pipe and is communicated with the third steam outlet of the medium-pressure cylinder through the steam extraction pipe to form a steam extraction and steam supplementation structure of a heat supply loop.
The purpose of the invention can be realized by the following technical scheme:
furthermore, the heat supply pipe network is communicated with the third steam outlet of the medium-pressure cylinder and the steam inlet of the deaerator through the steam extraction pipe, so that a steam extraction and steam supplement structure for a condensed water heating structure and a heat supply loop is formed.
Furthermore, the heat supply pipe network is communicated with the third steam outlet of the medium-pressure cylinder and the steam inlet end of the low-pressure heater through a steam extraction pipe to form a steam extraction and steam supplement structure for the condensed water heating structure and the heat supply loop.
Furthermore, the induced draft fan is composed of one 100% capacity driven induced draft fan or two 50% capacity driven induced draft fans.
Furthermore, four of the steam outlets of the medium-pressure cylinder of the main steam turbine are connected with a heat supply device through a communicating pipe to form a standby or supplementary heat source structure of the heat supply device.
Furthermore, the heat supply pipe network is connected with a regenerative steam extraction pipeline or a steam extraction pipeline through a switching through pipe, and the switching through pipe is connected with a regenerative loop through the regenerative steam extraction pipeline or the steam extraction pipeline to form a low-load high-heat recovery balance pipeline.
Further, the low-pressure heater is a 100% capacity heater or two 50% capacity heaters.
The invention has the following outstanding advantages:
1. the invention is characterized in that three steam outlets of the medium-pressure cylinder are communicated with the steam extraction pipe, the steam outlet end of the back-pressure small steam turbine is communicated with the steam inlet end of the steam condenser through the heat supply pipe network, the heat supply pipe network is communicated with the steam extraction pipe and is communicated with three steam outlets of the medium-pressure cylinder through the steam extraction pipe, and a steam extraction and steam supplementation structure of a heat supply loop is formed, therefore, when the generator set normally operates, the steam extraction thermal pressure of the back-pressure small steam turbine is enough to be discharged into the heat supply pipe network, the heat supply system normally operates, when the steam extraction pressure of the small steam turbine cannot be discharged into the heat supply pipe network under low load of the generator set, the steam extraction passage two is communicated with the steam outlet end of the medium-pressure cylinder through the steam extraction pipe, the back-pressure steam extraction pipe or the steam extraction pipe, and forms auxiliary supplementation to the steam inlet of the back-pressure small steam turbine, so that the steam extraction thermal pressure of the back-pressure small steam turbine is enough to be discharged into the heat supply pipe network, the heat supply system can normally operate, the safe starting and accident shutdown functions of the generator set can be guaranteed, when the steam exhaust pressure of the small steam turbine cannot be exhausted into a heat supply pipe network under the low load of the generator set, the generator set can operate through a peak regulation safe operation structure, and when the generator set operates under the low load, a heat supply heat source can be switched into a cylinder or a communicating pipe of the cylinder to punch and extract steam, so that stable heat supply under the low load of the generator set is realized.
2. The induced draft fan is driven by the small back pressure steam turbine, and the high-temperature high-pressure steam pipe arranged on the boiler reheater is connected with the small back pressure steam turbine, so that the small back pressure steam turbine used as a main heat supply source for steam exhaust can drive the small back pressure steam turbine to reduce the steam extraction heat supply amount of the cylinder of the main steam turbine and improve the work output capacity of the main steam turbine, thereby realizing high-efficiency heat supply of a unit under high load
3. The invention reduces the unplanned shutdown times of the unit due to the reduction of the unit or the heat supply load rate, thereby reducing the starting cost of the unit, reducing the operation and maintenance cost of the whole life cycle of the power plant and improving the operation economy of the power plant.
Drawings
Fig. 1 is a schematic structural diagram of embodiment 1 of the present invention.
Fig. 2 is a schematic structural diagram of embodiment 2 of the present invention.
Fig. 3 is a schematic structural diagram of embodiment 3 of the present invention.
Fig. 4 is a schematic structural diagram of embodiment 4 of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Specific example 1:
referring to fig. 1, the wide-load heat supply energy-saving system of the back-pressure small steam turbine driven draught fan comprises a main steam turbine, a back-pressure small steam turbine 62, a draught fan 5, a boiler reheater 4, a deaerator 7 and a low-pressure heater 8, wherein a high-pressure cylinder 1 and a medium-pressure cylinder 2 are arranged in the main steam turbine, the steam exhaust end of the high-pressure cylinder 1 is connected with the steam inlet end of the boiler reheater 4 through a high-temperature steam exhaust pipe 101, and one of the steam outlet ends of the boiler reheater 4 is connected with the steam inlet end of the medium-pressure cylinder 2 to form a reheating loop; the second steam outlet end of the boiler reheater 4 is connected with the steam inlet end of the small back pressure turbine 62 through a secondary high temperature steam pipe 111 to form a heat supply loop of the small back pressure turbine; the power output end of the back pressure type small steam turbine 62 is connected with the driving input end of the induced draft fan 5 to form an induced draft fan driving loop; one of the steam outlets of the medium-pressure cylinder 2 is connected with the steam inlet end of the deaerator 7 through a regenerative steam extraction pipeline 202, and the other steam outlet of the medium-pressure cylinder 2 is connected with the steam inlet end of the low-pressure heater 8 through a steam extraction pipeline 203 to form a regenerative loop; a water inlet of the low-pressure heater 8 is connected with a condensed water pipeline, and a water outlet of the low-pressure heater is connected with a water inlet end of the deaerator 7 through a condensed water pipeline 301; the three steam outlets of the medium-pressure cylinder 2 are communicated with the steam extraction pipe 201, the back-pressure small steam turbine 62 can exhaust steam through a heat supply pipe network 501, the heat supply pipe network 501 is communicated with the steam inlet end of the condenser 9 to form safe starting and accident shutdown of the generator set, and the heat supply pipe network 501 is communicated with the steam extraction pipe 201 and is communicated with the three steam outlets of the medium-pressure cylinder 2 through the steam extraction pipe 201 to form a steam extraction and steam supplementation structure of a heat supply loop.
In the embodiment, four exhaust ports of the medium-pressure cylinder 2 of the main steam turbine are connected with the heat supply equipment 3 through the communicating pipe 102 to form a standby or supplementary heat source structure of the heat supply equipment. The heat supply pipe network 501 is communicated with the third steam outlet of the medium-pressure cylinder 2 and the steam inlet of the deaerator 7 through the steam extraction pipe 201 to form a steam extraction and steam supplement structure for a condensed water heating structure and a heat supply loop. The heat supply pipe network 501 is connected with the regenerative steam extraction pipe 202 through a switching through pipe 502, and the switching through pipe 502 is connected with the regenerative loop through the regenerative steam extraction pipe 202 to form a low-load high-heat recovery balance pipeline. The water pump 5 is a 100% capacity driving draught fan, and the low-pressure heater 8 is a 100% capacity heater.
Specific example 2:
referring to fig. 2, the technical features of this embodiment are: the water pump 5 is two 50% capacity driven induced draft fans, and the two 50% capacity driven induced draft fans respectively supply water to the two back pressure type small steam turbines 62. The rest is the same as example 1.
Specific example 3:
referring to fig. 3, the technical features of this embodiment are: the heat supply pipe network 501 is communicated with the third steam outlet of the medium-pressure cylinder 2 and the steam inlet end of the low-pressure heater 8 through the steam extraction pipe 201 to form a steam extraction and steam supplement structure for a condensed water heating structure and a heat supply loop. The heat supply pipe network 501 is connected with the steam extraction pipe 203 through a switching through pipe 502, and the switching through pipe 502 is connected with the regenerative loop through the steam extraction pipe 203 to form a low-load high-heat recovery balance pipe. The induced draft fan 5 is a 100% capacity driven induced draft fan. The low pressure heater 8 is a 100% capacity heater. The rest is the same as example 1.
Specific example 4:
referring to fig. 4, the technical features of this embodiment are: the water pump 5 is two 50% capacity driven induced draft fans, and the two 50% capacity driven induced draft fans respectively supply water to the two back pressure type small steam turbines 62. The rest is the same as example 3.
The invention has the technical characteristics that:
the induced draft fans 5 are configured to be 1 100% capacity-driven induced draft fan or 2 50% capacity-driven induced draft fans. The inlet steam source of the back pressure type small turbine is the high-pressure high-temperature steam 111 which is obtained by partially discharging steam 101 from the high-pressure cylinder 1 of the main turbine and partially heated by the boiler reheater 4. The exhaust steam of the back pressure type small steam turbine is mainly discharged to the heat supply pipe network 501. The steam extraction pipe 201 of the main steam turbine cylinder 2 or the communicating pipe 102 thereof extracts steam as a standby or supplementary heat source for heat supply, and is converged with the steam exhaust heat supply pipe network 501 of the back pressure type small steam turbine to supply heat to the outside. The exhaust steam of the back pressure type small steam turbine is provided with two paths of bypasses. One end of a heat supply pipe network 501 is discharged to the condenser 9 after pressure reduction and temperature reduction, and the other end of the heat supply pipe network discharges heat to the outside, so that the functions of safe starting and accident shutdown of the whole set of unit are realized. In addition, one path of heat supply pipe network 501 is discharged to a deaerator 7 or a low-pressure heater 8, namely the heat supply pipe network 501 is connected with a steam extraction pipe 202 or a steam extraction pipeline 203 to heat condensed water 301, so that the unit can still operate safely and efficiently by peak regulation when the steam extraction pressure of the small steam turbine cannot be discharged into the heat supply pipe network under the low load of the unit. When the unit operates at low load, the heat supply heat source can be switched into a cylinder or a communicating pipe thereof to punch and extract steam, so that stable heat supply under the low load of the unit is realized. The low-pressure heater is a 100% capacity heater or two 50% capacity heaters.
The heat supply pipe network 502 is connected with the regenerative steam extraction pipe 202 or the steam extraction pipeline 203 through a switching through pipe 502, and the switching through pipe 502 is connected with the regenerative steam extraction pipe 201 or the steam extraction pipeline 203 to form a low-load high-heat recovery balance pipeline. Under the use condition that the exhaust steam temperature of the small back pressure turbine rises along with the reduction of the load of the unit and the exhaust steam pressure reduces along with the reduction of the load of the unit, when the exhaust steam can not supply heat in the low-load operation of the unit, the superheat degree of the exhaust steam is higher, and the exhaust steam is selectively discharged to the low-pressure heater 8 or the deaerator 7 to heat condensed water through switching the through pipe, so that the steam quantity of an original regenerative steam extraction system is reduced or even replaced, the working steam of the main turbine is increased, and the output of the unit is improved. Therefore, the heat consumption of the unit can be further reduced under the heat supply working condition, the safe and efficient operation under low load can be met, and the two functions of efficient heat supply and wide-load peak shaving heat supply are achieved.
The back pressure type small steam turbine is provided with a switching through pipe 502 which can be connected with a regenerative steam extraction pipe 202 between a steam turbine intermediate pressure cylinder 2 and a deaerator 7 or connected with a steam extraction pipe 203 between the steam turbine intermediate pressure cylinder and a low pressure heater 4. Therefore, when the power grid dispatching requirement or the heat supply user requirement is reduced and the unit needs to operate at a low load, although the steam discharged by the small back pressure turbine cannot be discharged into a heat supply pipe network, the unit can continue to operate safely and efficiently by discharging the steam into the low-pressure heater or the deaerator, and at the moment, the heat supply steam source is switched to the adjusting steam extraction port of the main steam turbine cylinder, so that the functions of unit wide load peak regulation and low load heat supply are realized.
Example of engineering application:
fig. 1 to 4 show four embodiment flows of the cross-load heat supply energy-saving technology of the backpressure type small steam turbine driven induced draft fan. For a conventional coal-fired thermal power plant, particularly a large-capacity heat supply unit in an industrial park, 1 100% capacity induced draft fan is adopted for a unit with the lower grade of 600MW, or 1 100% capacity induced draft fan or 2 50% capacity induced draft fans are adopted for a unit with the grade of 600MW or above. The draught fans are driven by small back pressure turbines, the steam inlet source of each small back pressure turbine comes from the outlet of a vertical low-temperature reheater of the boiler, and the exhausted steam of each small back pressure turbine is normally supplied with heat to the outside after being combined with the extracted steam of the steam turbine. Two bypasses are added to the exhaust steam of the back pressure type small steam turbine. One bypass is used for discharging exhaust steam into a condenser after passing through a temperature and pressure reducing device so as to realize the start of the unit, and the bypass is used for accommodating the exhaust steam of the small steam turbine when the unit is stopped due to accidents and recovering working media. One bypass is to exhaust the exhaust steam into the deaerator or low pressure heater, fig. 1 and 2 show an example flow where the exhaust steam piping 501 joins the regenerative steam extraction piping 202 interconnecting the deaerator and the turbine intermediate pressure cylinder 2, and fig. 3 and 4 show an example flow where the exhaust steam piping 501 joins the extraction piping 203 interconnecting the low pressure heater and the turbine intermediate pressure cylinder 2. When the unit is low in load or heat supply load is low, the steam quantity and the recovered heat quantity of a regenerative steam extraction system of a deaerator or a low-pressure heater are reduced, the low-load operation economy is improved, and low-load safe and efficient heat supply and wide-load peak regulation operation are realized.
In addition, when the heat supply load is greatly fluctuated under the influence of economic social environment or natural environment, the low-load heat supply requirement can be met by extracting steam from the main steam turbine set.
Compared with the conventional unit steam extraction and heat supply scheme that a condensing type small steam turbine drives a draught fan under the rated full load heat supply working condition, the invention can reduce the external heat supply and steam extraction quantity of the main steam turbine on the basis of ensuring the same heat supply load, the heat consumption value can be reduced by 20kJ/kWh, and the standard coal consumption for power generation is reduced by about 0.8 g/kWh. According to the higher operation hours of the heat supply unit, the fuel cost is saved by about 300-400 RMB per year, the fuel cost can be saved by about 1 million RMB in the whole life cycle of the power plant, and the benefit is considerable.
Claims (7)
1. Wide load heat supply economizer system of little steam turbine drive draught fan of back pressure formula, including main steam turbine, little steam turbine of back pressure formula (62), draught fan (5), boiler reheater (4), oxygen-eliminating device (7) and low pressure feed water heater (8), be equipped with high-pressure cylinder (1) and medium pressure cylinder (2), its characterized in that in the main steam turbine: the exhaust end of the high-pressure cylinder (1) is connected with the steam inlet end of the boiler reheater (4) through a high-temperature exhaust pipe (101), one of the steam outlet ends of the boiler reheater (4) is connected with the steam inlet end of the medium-pressure cylinder (2), and a reheating loop is formed; the second steam outlet end of the boiler reheater (4) is connected with the steam inlet end of the backpressure small steam turbine (62) through a secondary high-temperature steam pipe (111) to form a heat supply loop of the backpressure small steam turbine; the power output end of the back pressure type small steam turbine (62) is connected with the driving input end of the induced draft fan (5) to form an induced draft fan driving loop; one of the steam outlets of the medium-pressure cylinder (2) is connected with the steam inlet end of the deaerator (7) through a regenerative steam extraction pipeline (202), and the other steam outlet of the medium-pressure cylinder (2) is connected with the steam inlet end of the low-pressure heater (8) through a steam extraction pipeline (203) to form a regenerative loop; a water inlet of the low-pressure heater (8) is connected with a condensed water pipeline, and a water outlet of the low-pressure heater is connected with a water inlet end of the deaerator (7) through a condensed water pipeline (301); the three steam outlets of the medium-pressure cylinder (2) are communicated with a steam extraction pipe (201), the steam exhaust end of the back-pressure type small steam turbine (62) passes through a heat supply pipe network (501), the heat supply pipe network (501) is communicated with the steam inlet end of a condenser (9) to form safe starting and accident shutdown of a generator set, and the heat supply pipe network (501) is communicated with the steam extraction pipe (201) and is communicated with the three steam outlets of the medium-pressure cylinder (2) through the steam extraction pipe (201) to form a steam extraction and steam supplement structure of a heat supply loop.
2. The wide-load heat supply energy-saving system of the back-pressure small steam turbine driven draught fan according to claim 1, characterized in that: the heat supply pipe network (501) is communicated with the third steam outlet of the medium-pressure cylinder (2) and the steam inlet of the deaerator (7) through a steam extraction pipe (201) to form a steam extraction and steam supplement structure for a condensed water heating structure and a heat supply loop.
3. The wide-load heat supply energy-saving system of the back-pressure small steam turbine driven draught fan according to claim 1, characterized in that: the heat supply pipe network (501) is communicated with the third steam outlet of the medium-pressure cylinder (2) and the steam inlet end of the low-pressure heater (8) through a steam extraction pipe (201) to form a steam extraction and steam supplement structure for a condensed water heating structure and a heat supply loop.
4. The wide-load heat supply energy-saving system of the back-pressure small steam turbine driven draught fan according to claim 2 or 3, characterized in that: the induced draft fan (5) is composed of one 100% capacity driven induced draft fan or two 50% capacity driven induced draft fans.
5. The wide-load heat supply energy-saving system of the back-pressure small steam turbine driven draught fan according to claim 2 or 3, characterized in that: four of the steam outlets of the medium-pressure cylinder (2) of the main steam turbine are connected with the heat supply equipment (3) through a communicating pipe (102) to form a standby or supplementary heat source structure of the heat supply equipment.
6. The wide-load heat supply energy-saving system of the back-pressure small steam turbine driven draught fan according to claim 2 or 3, characterized in that: the heat supply pipe network (501) is connected with the regenerative steam extraction pipeline (202) or the steam extraction pipeline (203) through a switching through pipe (502), and the switching through pipe (502) is connected with the regenerative loop through the regenerative steam extraction pipeline (202) or the steam extraction pipeline (203) to form a low-load high-heat recovery balance pipeline.
7. The wide-load heat supply energy-saving system of the back-pressure small steam turbine driven draught fan according to claim 2 or 3, characterized in that: the low-pressure heater (8) is a 100% capacity heater or two 50% capacity heaters.
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| CN105889897B (en) * | 2016-01-29 | 2018-02-16 | 中国电力工程顾问集团西北电力设计院有限公司 | A kind of thermal power plant residual heat integrative recycling system and method |
| CN107504543B (en) * | 2016-12-16 | 2023-07-11 | 大唐东北电力试验研究所有限公司 | Method for improving deep peak regulation of cogeneration unit by utilizing electric boiler heat supply |
| CN109297074B (en) * | 2018-09-17 | 2020-08-14 | 国网湖南省电力有限公司 | Control method and system of back pressure type steam driven induced draft fan small steam turbine exhaust steam heating system |
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