CN213298059U - Coal burner unit heating device with backpressure small turbine matched with asynchronous generator - Google Patents
Coal burner unit heating device with backpressure small turbine matched with asynchronous generator Download PDFInfo
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- CN213298059U CN213298059U CN202021356117.0U CN202021356117U CN213298059U CN 213298059 U CN213298059 U CN 213298059U CN 202021356117 U CN202021356117 U CN 202021356117U CN 213298059 U CN213298059 U CN 213298059U
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Abstract
The utility model discloses a coal burner unit heating device with a backpressure small steam turbine matched with an asynchronous generator, which comprises a steam main pipe, a safety protection valve group, at least one backpressure small steam turbine, at least one preposed heat supply network heater, at least one peak heat supply network heater, a heating hot water supply main pipe, a circulating water main pipe and a peak heat supply network heater water supply main pipe, wherein the input end of the steam main pipe is connected with a middle and low pressure communicating pipe of the steam turbine through the safety protection valve group; the at least one back pressure type small steam turbine is respectively in driving connection with the asynchronous generator, a steam inlet of the small back pressure type steam turbine is connected to the steam main pipe in a bypassing mode, and a steam outlet of the small back pressure type steam turbine is respectively connected with a steam inlet end of the at least one preposed heat supply network heater; the input end of the circulating water main pipe is connected with a heating hot water return pipe through a heat supply network circulating water pump. The utility model discloses can improve the generating capacity and the thermal efficiency of whole factory of unit when satisfying unit heat supply demand, simple structure easy to implement, energy-concerving and environment-protective, heat supply stably lasts.
Description
Technical Field
The utility model relates to a steam heating engineering field especially relates to a little turbine of backpressure joins in marriage asynchronous generator's coal burner group heating device.
Background
At present, the heat supply transformation of a medium-low pressure communicating pipe is one of the heat supply transformation technical schemes of domestic large coal-fired condensing turbines, namely, the steam discharged by a medium-pressure cylinder of the turbine is used as the air source of a heat supply network head station, so that the aim of supplying heat to the outside is fulfilled. The transformation scheme is simple to implement, the initial investment is small, and a large number of mature cases exist in China. The steam-discharging pressure of the intermediate pressure cylinder is higher, about 0.8MPa and far higher than the requirement of the steam parameter required by the first station of the heat supply network, about 0.2MPa, so that high-quality steam is wasted to a certain extent.
SUMMERY OF THE UTILITY MODEL
The utility model provides a little turbine of backpressure joins in marriage asynchronous generator's coal fired unit heating device to the well low pressure closed tube heat supply of solving current large-scale coal-fired condensing steam turbine heat supply and reforming transform the technical problem that easily causes the high-quality steam waste.
The utility model adopts the technical scheme as follows:
a coal burner unit heating device with a backpressure small turbine matched with an asynchronous generator comprises a steam main pipe, a safety protection valve group, at least one backpressure small turbine, at least one preposed heat supply network heater, at least one peak heat supply network heater, a heating hot water supply main pipe, a circulating water main pipe and a peak heat supply network heater water supply main pipe, wherein the input end of the steam main pipe is connected with a medium-low pressure communicating pipe of the turbine through the safety protection valve group; the at least one back pressure type small steam turbine is respectively in driving connection with the asynchronous generator, a steam inlet of the small back pressure type steam turbine is connected to the steam main pipe in a bypassing mode, and a steam outlet of the small back pressure type steam turbine is respectively connected with a steam inlet end of the at least one preposed heat supply network heater; the input end of the circulating water main pipe is connected with a heating hot water return pipe through a heat supply network circulating water pump, the circulating water inlet of the at least one preposed heat supply network heater is connected to the circulating water main pipe in a bypassing manner, and the circulating water outlet of the at least one preposed heat supply network heater is connected to the peak heat supply network heater water supply main pipe in a bypassing manner; and the circulating water inlet of the at least one peak heat supply network heater is connected to the peak heat supply network heater water supply main pipe in a bypassing manner, and the circulating water outlet of the at least one peak heat supply network heater is connected to the heating hot water supply main pipe for providing heating hot water for users in a bypassing manner.
Further, still include heat supply network water charging system, heat supply network water charging system includes heat supply network moisturizing oxygen-eliminating device, sets up the oxygen-eliminating device water tank of heat supply network moisturizing oxygen-eliminating device bottom, the oxygen-eliminating device water tank loops through heat supply network moisturizing pump, heat supply network moisturizing pipeline connection heat supply network circulating water pump entry, heat supply network moisturizing oxygen-eliminating device is the atmosphere formula, and softened water is connected at its moisturizing mouth, and the female pipe of deoxidization steam is connected to the deoxidization steam mouth.
Furthermore, the safety protection valve group comprises a hydraulic quick-closing valve, a pneumatic check valve and an electric shutoff valve which are arranged in series along the steam flow direction.
Furthermore, the at least one preposed heat supply network heater and the at least one peak heat supply network heater are both provided with emergency water drain pipelines, and the emergency water drain pipelines are collected and then sequentially connected with a water drain flash tank, a water drain tank, an emergency water drain pump and a heat supply network water supplementing deaerator; and an emergency water drain pipeline of the deaerator is connected between the deaerator water tank and the drain tank.
Furthermore, at least one preposed heat supply network heater is provided with a drain pipeline, and the drain pipelines are connected to the unit deaerator through a preposed heat supply network heater drain pump after being collected.
Furthermore, at least one peak heat supply network heater all is provided with the drain pipe, and each drain pipe is collected the back and is connected to unit oxygen-eliminating device through peak heat supply network heater drainage pump.
Furthermore, a pressure relief bypass pipe with a check valve is arranged between the input end and the output end of the heat supply network circulating water pump in a bypass mode in parallel.
Further, the at least one back pressure type small steam turbine comprises two back pressure type small steam turbines, the at least one front heat supply network heater comprises two front heat supply network heaters, the at least one peak heat supply network heater comprises three peak heat supply network heaters, the two peak heat supply network heaters are in an operating state during operation, and the other peak heat supply network heater is in a standby state.
Furthermore, the preposed heat supply network heater drain pump, the emergency drain pump and the peak heat supply network heater drain pump are all two, and one of the pumps runs and the other pump is standby during operation.
Furthermore, a hydrophobic recycling pipeline is arranged between the output end of the drain pump of the preposed heat supply network heater and each preposed heat supply network heater, and between the output end of the drain pump of the peak heat supply network heater and each peak heat supply network heater.
The utility model discloses following beneficial effect has:
the utility model provides a little turbine of backpressure joins in marriage asynchronous generator's coal fired unit heating device includes the female pipe of steam, the safety protection valves, at least one little turbine of backpressure formula, at least one leading heat supply network heater, at least one peak heat supply network heater, the female pipe of heating hot water supply, the female pipe of circulating water, the female pipe of peak heat supply network heater water supply, the utility model discloses a two backpressure turbines and two peak heater two-stage series connection heating heat supply network circulating water's mode realize external heat supply, utilize the steam turbine intermediate pressure jar steam extraction as the drive vapour source of backpressure turbine and the admission vapour source of peak heat supply network heater, utilize the little turbine of heating steam band backpressure formula electricity generation to replace the adiabatic process that steps down of heating steam, can gain better energy-conserving effect, shut down the backpressure turbine during non-heat supply, the unit resumes former pure operating mode operation of congealing. Meanwhile, the two back pressure turbines respectively drag an asynchronous generator to be connected into a plant power system, so that the plant power rate can be further reduced, the plant heat efficiency is further improved, and the generating capacity of the unit and the plant heat efficiency can be improved while the heat supply requirement of the unit is met.
In addition to the above-described objects, features and advantages, the present invention has other objects, features and advantages. The present invention will be described in further detail below with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification. In the drawings:
fig. 1 is a schematic view of a coal burner unit heating device of a backpressure small turbine combined with an asynchronous generator according to a preferred embodiment of the invention.
In the figure:
1. a medium-low pressure communicating pipe; 2. a hydraulic quick-closing valve; 3. a pneumatic check valve; 4. an electrically operated shutoff valve; 5. a steam main pipe; 6. a back pressure type small steam turbine; 7. a front heating network heater; 8. a spike heat net heater; 9. a hydrophobic recirculation conduit; 10. an emergency water discharge pipeline; 11. a drain pipe; 12. a drain pump of the preposed heat supply network heater; 13. a peak heating network heater drain pump; 14. a drain tank; 15. a hydrophobic flash tank; 16. an emergency drain pump; 17. a heating hot water supply main pipe; 18. a main pipe for circulating water; 19. a heat supply network circulating water pump; 20. a pressure relief bypass pipe with a check valve; 21. a dirt separator; 22. a heat supply network water supply pipeline; 23. an emergency water discharge pipeline of the deaerator; 24. a heat supply network water replenishing pump; 25. a deaerator water tank; 26. a heat supply network water replenishing deaerator; 27. the peak heating network heater supplies water to the main pipe.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments. Referring to fig. 1, the preferred embodiment of the present invention provides a coal burner unit heating device with a backpressure small turbine combined with an asynchronous generator, comprising a steam main pipe 5, a safety protection valve group, two backpressure small turbines 6, two preposed heat supply network heaters 7, three peak heat supply network heaters 8, a heating hot water supply main pipe 17, a circulating water main pipe 18, and a peak heat supply network heater water supply main pipe 27, wherein the input end of the steam main pipe 5 is connected with a medium-low pressure communicating pipe 1 of a turbine through the safety protection valve group; the two small back-pressure turbines 6 are respectively in driving connection with an asynchronous generator, the steam inlets of the two small back-pressure turbines are connected to the steam main pipe 5 in a bypassing manner, and the steam outlets are respectively connected with the steam inlet ends of the at least one preposed heat supply network heater 7; the input end of the circulating water main pipe 18 is connected with a heating hot water return pipe through a heat supply network circulating water pump 19 and a dirt separator 21, circulating water inlets of the two preposed heat supply network heaters 7 are connected to the circulating water main pipe 18 in a bypassing mode, and circulating water outlets of the two preposed heat supply network heaters 7 are connected to the peak heat supply network heater water supply main pipe 27 in a bypassing mode; circulating water inlets of the three peak heat supply network heaters 8 are connected to the peak heat supply network heater water supply main pipe 27 in a bypassing mode, and circulating water outlets of the three peak heat supply network heaters 8 are connected to the heating hot water supply main pipe 17 which provides heating hot water for users in a bypassing mode.
The circulating backwater of the heat supply network enters an inlet of a circulating water pump 19 of the heat supply network after being decontaminated by a decontaminating device 21, then enters two preposed heat supply network heaters 7, heats the circulating water of the heat supply network from 70 ℃ to 95 ℃, then passes through three peak heat supply network heaters 8 (two operation and one standby) to heat the circulating water of the heat supply network from 95 ℃ to 130 ℃, and finally is gathered into a heating hot water supply main pipe 17. The dirt separator 21 is an electric dirt separator and can discharge sewage to a plant catch basin at regular time.
The asynchronous generator has the advantages of simple structure, small occupied area, high reliability and slightly low investment; the control system is simple, synchronous and excitation devices are not needed, and grid-connected operation is simple and convenient. The voltage of the plant bus of the access section is reduced because the asynchronous generator needs to absorb reactive power from the system during operation, but for a large-scale power plant, the power factor of the whole plant is higher, the capacity is larger, the voltage change is still within the range allowed by the system, and the reactive power of the main generator can be adjusted within a certain range. Therefore, the backpressure type small turbine 6 is adopted to drag the asynchronous generator to generate electricity, and the heat supply transformation is the optimal choice.
The coal burner unit heating device with the backpressure small turbine and the asynchronous generator provided by the embodiment adopts a mode of heating heat supply network circulating water by two backpressure turbines and two peak heaters in two-stage series connection, realizes external heat supply, uses turbine intermediate pressure cylinder exhaust steam as a driving steam source of the backpressure turbines and a steam inlet steam source of the peak heat supply network heater 8, and generates electricity by using the heat supply steam belt backpressure small turbine 6 to replace the heat supply steam heat insulation and pressure reduction process, so that a better energy-saving effect can be obtained, the backpressure turbines are shut down during non-heat supply, and the unit is recovered to the original pure condensation working condition to operate. Meanwhile, the two back pressure turbines respectively drag an asynchronous generator to be connected into a plant power system, so that the plant power rate can be further reduced, the plant heat efficiency is further improved, and the generating capacity of the unit and the plant heat efficiency can be improved while the heat supply requirement of the unit is met.
In the embodiment, external heat supply is realized by adopting a two-stage series heating mode of a small backpressure steam turbine and a heat supply network peak heater, steam extracted by a medium-low pressure communicating pipe firstly enters two small high backpressure steam turbines to do work and drag two asynchronous generators, the exhausted steam of the small backpressure steam turbines enters a preposed heat supply network heater 7 to be used as the steam inlet of the preposed heat supply network heater 7, and the two preposed heat supply network heaters 7 are responsible for heating heat supply network circulating water from 70 ℃ to 95 ℃. And then the temperature of the circulating water of the heat supply network is heated to 130 ℃ from 95 ℃ through two peak heat supply network heaters 8 connected in series behind the heat supply network, the steam inlet of the peak heat supply network heaters 8 is the steam extraction of a medium-low pressure communicating pipe, the peak heat supply network heaters 8 are selected to be full-capacity heaters, the circulating water of the heat supply network can be heated to 130 ℃ from 70 ℃, namely the two peak heat supply network heaters 8 can be used as the initial stations of the full-capacity heat supply network to operate when the small steam turbine is shut down, and 100% of heat supply load of the heat supply network system is borne. Meanwhile, in the embodiment, one peak heat supply network heater 8 is additionally arranged for standby, and the capacity of the peak heat supply network heater 8 is equal to that of the other two peak heat supply network heaters 8.
The utility model discloses an in the preferred embodiment, still include heat supply network water charging system, heat supply network water charging system includes heat supply network moisturizing oxygen-eliminating device 26, sets up the oxygen-eliminating device water tank 25 of 26 bottoms of heat supply network moisturizing oxygen-eliminating device, oxygen-eliminating device water tank 25 loops through heat supply network moisturizing pump 24, heat supply network moisturizing pipeline 22 and connects 19 entries of heat supply network circulating water pump, heat supply network moisturizing oxygen-eliminating device 26 is the atmosphere formula, and softened water is connected at its moisturizing mouth, and female pipe 5 of steam is connected to the deoxidization steam port. When the pressure in the heating hot water supply loop is reduced due to insufficient return water amount, water needs to be supplemented, meanwhile, oxygen in softened water needs to be removed through the heat supply network water supplementing deaerator 26, the quality of water is guaranteed, corrosion to a pipeline is reduced, safe operation of equipment is guaranteed, and the water supplementing mode can play a role in constant pressure on a heat supply network system.
In the preferred embodiment of the present invention, the safety valve set comprises a hydraulic quick-closing valve 2, a pneumatic check valve 3, and an electric shutoff valve 4, which are serially connected along the steam flow direction. So as to quickly cut off the steam when the abnormity occurs to realize the safety protection of steam extraction.
In the preferred embodiment of the present invention, the two preposed heat supply network heaters 7 and the three peak heat supply network heaters 8 are both provided with emergency water drain pipes 10, and the emergency water drain pipes 10 are collected and then sequentially connected with a drain flash tank 15, a drain tank 14, an emergency drain pump 16 and a heat supply network water replenishing deaerator 26; still connect between deaerator water tank 25 and the drain box 14 and be provided with emergent drain pipe 23 of deaerator, ensure the safe operation of heat supply network moisturizing deaerator 26, deaerator water tank 25.
In order to ensure the safe operation of the heater, the heat supply network system of the embodiment is provided with an emergency water discharge pipe 10, and a drain flash tank 15 and a drain tank 14. In the accident condition, the drainage in the preposed heat supply network heater 7 and the peak heat supply network heater 8 is conveyed to a drainage flash tank 15 through an emergency drainage pipeline 10 for decompression, then enters a drainage tank 14, and finally is conveyed to a heat supply network water supplementing deaerator 26 in a heat supply initial station through two emergency drainage pumps 16 (one for one) arranged in the heat supply initial station, and meanwhile, a branch pipe is connected to a heat supply network water return pipeline at the input end of a heat supply network circulating water pump 19. In the preferred embodiment of the present invention, the two preposed heat supply network heaters 7 are all provided with a drain pipe 11, and each drain pipe 11 is connected to the unit deaerator through a preposed heat supply network heater drain pump 12 after gathering, so as to ensure the safe and effective operation of the preposed heat supply network heaters 7 and the unit.
In the preferred embodiment of the present invention, the three peak heat net heaters 8 are all provided with the drain pipes 11, and each drain pipe 11 is connected to the unit deaerator through the peak heat net heater drain pump 13 after being collected. The safe and effective operation of the peak heat supply network heater 8 and the unit is ensured.
In the preferred embodiment of the present invention, a pressure relief bypass pipe 20 with a check valve is further arranged in parallel and in bypass between the input end and the output end of the heat supply network circulating water pump 19.
In the heating system using water as heating medium, the flowing water in the pipeline can stop flowing suddenly due to sudden power failure or sudden pump stop of other reasons, so that the kinetic energy flowing at a certain flow velocity is converted into pressure energy, and the water pressure in the pipeline at the inlet end of the heat supply network circulating water pump 19 is increased rapidly to generate a water hammer phenomenon.
In the preferred embodiment of the present invention, the pre-heater grid heater drain pump 12, the emergency drain pump 16, and the peak heater grid heater drain pump 13 are two, and one of them operates during operation, and the other is standby, so as to ensure that the whole device will not be stopped due to the failure of one of the water pumps.
In the preferred embodiment of the utility model, between the output of leading heat supply network heater drainage pump 12 and each leading heat supply network heater 7, still be provided with hydrophobic recirculation pipeline 9 between the output of peak heat supply network heater drainage pump 13 and each peak heat supply network heater 8, its purpose is to maintain the water level of each heat supply network heater, guarantees that heat supply network heater and steam fully contact for the heat transfer normally goes on. The operation of the heating apparatus according to the above embodiment will be described in detail.
The temperature of the supply water and the return water of the circulating water of the heat supply network is generally 130 ℃/70 ℃. Limited by the self-adjusting characteristic of the small back-pressure turbine 6, the back pressure of the small back-pressure turbine 6 cannot be changed in a large range, and the back pressure cannot be adjusted in a large range along with the change of the load at the heat supply network end in operation. Therefore, the above embodiment changes the operation mode of the heat supply network system, and the specific process is as follows:
taking the example that the heat load changes from high to low, the flow of circulating water in the heat supply network is kept stable according to the adjustment of the heat supply network, the circulating water supply temperature is adjusted by the peak heat supply network heater 8, the circulating water supply temperature (the water temperature at the outlet of the peak heat supply network heater 8) is gradually reduced, and when the water temperature at the outlet of the peak heat supply network heater 8 is reduced to 95 ℃, the peak heat supply network heater 8 is stopped from operating. If the heat load drops further, one heat supply network circulating water pump 19 is shut down, and the heat supply network system is operated on one side (one pre-heat supply network heater 7 and one peak heat supply network heater 8) until only one pre-heat supply network heater 7 is operated. If the heat load further drops to the lowest load of the small back pressure turbine 6, the operation state of the single peak heating network heater 8 is switched. If the user side does not allow the heat supply network to operate at the half flow rate, the two heat supply network circulating water pumps 19 are kept fully opened, the flow rate of the heat supply network circulating water is stable, the circulating water supply temperature is adjusted through the peak heat supply network heater 8, the circulating water supply temperature (the water temperature at the outlet of the peak heat supply network heater 8) is gradually reduced, and when the water temperature at the outlet of the peak heat supply network heater 8 is reduced to 95 ℃, the peak heat supply network heater 8 is quitted from operating. And if the heat load is further reduced, reducing the loads of the two back pressure type small turbines 6 at the same time, and switching to the operating states of the two peak heat supply network heaters 8 when the heat load is further reduced to the lowest load of the back pressure type small turbines 6.
In the whole heat supply period, the back pressure type small turbine 6 is kept to run at full load as much as possible, so that the optimal running economy of the heat supply unit is ensured.
Just can better realization more than the technical scheme of the utility model to solve the middle and low pressure closed tube heat supply of current large-scale coal-fired condensing steam turbine heat supply transformation technique and reform transform the technical problem that easily causes the high-quality steam waste. The heat supply requirement of the unit is met, the power generation capacity of the unit and the whole plant heat efficiency can be improved, the structure is simple and easy to implement, the energy is saved, the environment is protected, the cost is low, and the heat supply is stable and continuous.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A coal burner unit heating device with a backpressure small turbine matched with an asynchronous generator is characterized by comprising a steam main pipe (5), a safety protection valve group, at least one backpressure small turbine (6), at least one preposed heat supply network heater (7), at least one peak heat supply network heater (8), a heating hot water supply main pipe (17), a circulating water main pipe (18) and a peak heat supply network heater water supply main pipe (27),
the input end of the steam main pipe (5) is connected with a medium-low pressure communicating pipe (1) of the steam turbine through a safety protection valve group;
the at least one back pressure type small steam turbine (6) is respectively in driving connection with an asynchronous generator, a steam inlet of the back pressure type small steam turbine is connected to the steam main pipe (5) in a bypassing mode, and a steam outlet of the back pressure type small steam turbine is respectively connected with a steam inlet end of the at least one preposed heat supply network heater (7);
the input end of the circulating water main pipe (18) is connected with a heating hot water return pipe through a heat supply network circulating water pump (19), the circulating water inlet of at least one preposed heat supply network heater (7) is connected to the circulating water main pipe (18) in a bypassing manner, and the circulating water outlet of at least one preposed heat supply network heater (7) is connected to the peak heat supply network heater water supply main pipe (27) in a bypassing manner;
the circulating water inlet of the at least one peak heat supply network heater (8) is connected to the peak heat supply network heater water supply main pipe (27) in a bypassing mode, and the circulating water outlet of the at least one peak heat supply network heater (8) is connected to a heating hot water supply main pipe (17) which provides heating hot water for users in a bypassing mode.
2. The coal burner unit heating device of the backpressure small turbine combined with the asynchronous generator is characterized by further comprising a heat supply network water replenishing system, wherein the heat supply network water replenishing system comprises a heat supply network water deaerator (26) and a deaerator water tank (25) arranged at the bottom of the heat supply network water deaerator (26), the deaerator water tank (25) is connected with an inlet of a heat supply network circulating water pump (19) sequentially through a heat supply network water replenishing pump (24) and a heat supply network water replenishing pipeline (22), the heat supply network water deaerator (26) is in an atmospheric type, a water replenishing port of the heat supply network water deaerator water replenishing device is connected with softened water, and a deaerating steam port of the heat supply network water replenishing system is connected with a steam main pipe (.
3. The coal burner unit heating apparatus of claim 1, wherein the backpressure turbine is provided with an asynchronous generator,
the safety protection valve group comprises a hydraulic quick-closing valve (2), a pneumatic check valve (3) and an electric shutoff valve (4) which are connected in series along the steam flow direction.
4. The coal burner unit heating device of the backpressure small turbine combined with the asynchronous generator is characterized in that the at least one preposed heat supply network heater (7) and the at least one peak heat supply network heater (8) are both provided with emergency water drain pipelines (10), and the emergency water drain pipelines (10) are converged and then sequentially connected with a water drain flash tank (15), a water drain tank (14), an emergency water drain pump (16) and a heat supply network water replenishing deaerator (26); and an emergency water drain pipeline (23) of the deaerator is also connected and arranged between the deaerator water tank (25) and the drain tank (14).
5. The coal burner unit heating apparatus of the back pressure small turbine combined with the asynchronous generator as set forth in claim 4,
the at least one preposed heat supply network heater (7) is provided with a drain pipeline (11), and the drain pipelines (11) are connected to the unit deaerator through a preposed heat supply network heater drain pump (12) after being collected.
6. The coal burner unit heating apparatus of claim 5 in which the backpressure small turbine is provided with an asynchronous generator,
the peak heat supply network heaters (8) are all provided with drain pipes (11), and the drain pipes (11) are connected to the unit deaerator through peak heat supply network heater drain pumps (13) after being collected.
7. The coal burner train heating apparatus of a back pressure small turbine combined with an asynchronous generator according to any one of claims 1 to 6,
and a pressure relief bypass pipe (20) with a check valve is also arranged between the input end and the output end of the heat supply network circulating water pump (19) in parallel.
8. The coal burner train heating installation with back pressure steam turbine and asynchronous generator as in claim 1, characterized in that the at least one back pressure steam turbine (6) comprises two back pressure steam turbines (6), the at least one pre-grid heater (7) comprises two pre-grid heaters (7), the at least one peak grid heater (8) comprises three peak grid heaters (8), and wherein two peak grid heaters (8) are operational during operation and the other peak grid heater (8) is standby.
9. The coal burner unit heating device of the backpressure small turbine combined with the asynchronous generator as set forth in claim 6, wherein the preposed heat supply network heater drain pump (12), the emergency drain pump (16) and the spike heat supply network heater drain pump (13) are all two, and one of them is operated and the other is standby during operation.
10. The coal burner unit heating device of the backpressure small turbine combined with the asynchronous generator as claimed in claim 6, wherein a hydrophobic recirculation pipeline (9) is further arranged between the output end of the preposed heat net heater drain pump (12) and each preposed heat net heater (7) and between the output end of the peak heat net heater drain pump (13) and each peak heat net heater (8).
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| CN202021356117.0U CN213298059U (en) | 2020-07-10 | 2020-07-10 | Coal burner unit heating device with backpressure small turbine matched with asynchronous generator |
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| CN202021356117.0U CN213298059U (en) | 2020-07-10 | 2020-07-10 | Coal burner unit heating device with backpressure small turbine matched with asynchronous generator |
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