CN212027896U - High-pressure injection type thermoelectric decoupling heat supply system - Google Patents
High-pressure injection type thermoelectric decoupling heat supply system Download PDFInfo
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- CN212027896U CN212027896U CN202020390941.1U CN202020390941U CN212027896U CN 212027896 U CN212027896 U CN 212027896U CN 202020390941 U CN202020390941 U CN 202020390941U CN 212027896 U CN212027896 U CN 212027896U
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Abstract
A high-pressure injection type thermoelectric decoupling heat supply system belongs to the technical field of cogeneration and central heat supply. Aiming at the contradiction between large-scale high-pressure steam supply and large-scale electricity load adjustment of a thermal power plant, a high-pressure injection decoupling device is arranged, wherein a driving steam inlet is connected with a new steam pipe, a low-pressure steam inlet is connected with a high-pressure cylinder steam exhaust pipe, an injection steam exhaust outlet is connected with a cold re-extraction pipe at an inlet of a boiler reheater, a hot re-extraction pipe at an outlet of the boiler reheater is provided with a steam extraction port to extract required high-pressure steam, a reheater bypass is arranged and is respectively connected with the cold re-extraction pipe and the hot re-extraction pipe, and a medium-pressure reducing valve. The control method comprises the following steps: the steam extraction quantity supplied outside the heat recovery pipe is equal to the sum of the driving steam quantity of the ejector and the water heating quantity; the bypass flow of the reheater is the same as the desuperheating water quantity of the ejection desuperheater; the medium-pressure reducing valve increases the heat and the high exhaust pressure to adjust the injection ratio; the mechanical furnace can automatically realize heat exchange and stress balance, and realize large-range high-pressure steam supply and full-load thermoelectric decoupling.
Description
Technical Field
The invention relates to a high-pressure injection type thermoelectric decoupling heat supply system, and belongs to the technical field of cogeneration and central heat supply.
Background
The cogeneration system has the problem of coupling heat supply and power generation, and along with the increase of urban heat supply and industrial steam supply requirements, the requirement on the thermoelectric decoupling of the thermal power unit is urgent day by day, and the conventional thermoelectric decoupling scheme and the main problems thereof are summarized as follows: the heat storage scheme and the electric boiler scheme have large occupied area and large investment scale and cannot realize comprehensive deep decoupling; the low pressure cylinder zero-output transformation comprises an optical axis scheme and a scheme of directly reducing or closing the steam inlet quantity of the low pressure cylinder and additionally introducing a small quantity of cooling steam to cool the final stage and a steam outlet, and the influence on the increase of the heat supply quantity is small; the high and low side combined steam distribution scheme has the problems that the recent pressure of a reheater is greatly reduced due to the fact that the steam inlet quantity of a steam turbine is greatly reduced when the power generation load rate is low, so that the volume flow is greatly increased, the through-flow capacity and the heat exchange quantity of the reheater are greatly reduced, the smoke temperature of the reheater is difficult to effectively reduce, and the reheater and the heating surface behind the reheater are overheated and damaged; the power generation load rate cannot be effectively reduced by punching a cylinder to extract steam, heating low-vacuum circulating water and the like; the main steam is directly used for punching steam extraction, or the reheater cold section pipeline (cold re) punching steam extraction at the steam exhaust outlet of the high-pressure cylinder, or the hot section pipeline (hot re) punching steam extraction at the outlet of the reheater can greatly reduce the power generation load rate, but when the steam extraction amount is large, a series of safety problems such as reheater overheating, turbine axial thrust overrun and the like are inevitably caused.
Aiming at the thermoelectric decoupling under the condition of heavy load and high pressure steam supply which is often met in an industrial park or a self-contained power plant, the schemes of high side-load and middle-linkage parameter adjustment and the like are developed at present, but the problems of high electric load rate, relatively small high pressure steam extraction amount and the like exist in the process of extracting a large amount of steam.
The injection type steam pressure matching technology and the injection type heat pump exhaust steam waste heat recovery technology are adopted, complete thermoelectric decoupling functions can be achieved, for example, large-scale thermoelectric decoupling is achieved in the following patents, an injection type heat pump exhaust steam recovery heat supply mode and a system (invention, 2019110728319) based on complete thermoelectric decoupling, an injection gas distribution thermoelectric decoupling mode (invention, 2019110733266) based on axial thrust balance and reheating balance and the like are suitable for large-scale high-load low-pressure steam extraction scenes such as urban heat supply capacity, but the wide-load thermoelectric decoupling problem under the condition of large-load high-pressure steam supply in an industrial park is not solved, and the problems of complex logic and control, relatively high difficulty in operation and management of cogeneration and the like exist.
Disclosure of Invention
Aiming at the inherent problems in deep thermoelectric decoupling under the condition of high-load high-pressure steam supply, the invention adopts technical measures of a high-pressure ejector, a medium-pressure reducing valve parameter, reheater bypass flow control and the like, can automatically realize reheater cooling heat exchange balance and steam turbine axial thrust balance, fundamentally ensures the safe operation of a boiler, and maximally realizes thermoelectric decoupling.
The specific description of the invention is: the utility model provides a high pressure injection type thermoelectric decoupling heating system, includes boiler superheater, reheater, steam turbine high pressure cylinder, intermediate pressure cylinder, low pressure cylinder, generator, decoupling zero injection device, temperature and pressure reduction device, connecting line and supporting valve part, its characterized in that: the decoupling injection device comprises a high-pressure injector 20, a driving steam inlet section 21 of the high-pressure injector 20 is respectively connected with an outlet of a superheater 3 of the boiler 1, an inlet of a high-pressure cylinder 4 and an inlet of an original high-side pipe 10 through a main steam pipe 9, a low-pressure steam inlet section 22 of the high-pressure injector 20 is respectively connected with a steam exhaust port of the high-pressure cylinder 4 through a low-pressure injection valve 18 and a high-exhaust port section of a cold re-flow pipe 12, the outlet of the original high side pipe 10 is connected with the inlet of the cold re-check valve 26, the ejection steam exhaust outlet section 23 of the high pressure ejector 20 is connected with the inlet of the reheater 2 of the boiler 1 and the outlet of the cold re-check valve 26 through the boiler inlet section of the cold re-pipe 12, the steam outlet of the reheater 2 is connected with the steam inlet of the intermediate pressure cylinder 5 through the hot re-pipe 13, and is also communicated with the steam heat consumer Y through the high pressure temperature-reducing pressure reducer 27, and the inlet of the reheater 2 is also connected with the inlets of the hot re-pipe 13 and the high pressure temperature-reducing pressure reducer 27 through the reheating regulating valve 29 on the reheater bypass 28.
The hot rehabilitating pipe 13 is also provided with a medium pressure relief valve 16, and an outlet of the medium pressure relief valve 16 is connected to an inlet of the medium pressure cylinder 5 via the intermediate gate 14.
And a gas distribution desuperheater 24 and a gas distribution check valve 25 are arranged on a pipe section between an ejection steam exhaust outlet section 23 of the high-pressure ejector 20 and a boiler inlet section of the cold-recycling pipe 12, wherein a desuperheating water inlet of the gas distribution desuperheater 24 is connected with an outlet of the desuperheating water valve 11.
The high-pressure ejector 20 adopts a stepless regulation joint type structure.
The steam outlet of the intermediate pressure cylinder 5 is connected with the low side steam inlet of the condenser 30 through a low side pipe, when the condenser 30 is used for heating the return water of the heat supply network and the electric load is reduced to be nearly zero, the valve of the low side pipe is opened, the electric load depends on 0 at the moment, the sum of the high-pressure steam heat supply and the heat supply of the whole system reaches the maximum value, and the nearly full-load thermoelectric decoupling is realized.
The invention has the technical effects and advantages that: by adopting an injection type technical principle, the inlet and outlet pressure of a reheater is improved by using a method of regulating parameters of a high-pressure injector and a medium-pressure reducing valve, the exhaust pressure of a high-pressure cylinder is improved within an allowable range, the bypass flow of the reheater is kept consistent with the flow of injection temperature-reducing water, and the heat exchange balance of the boiler reheater and the axial thrust balance of a steam turbine can be automatically realized, so that the safe operation of the boiler can be efficiently and stably realized; can realize large-amplitude external supply high-pressure steam extraction; the thermoelectric ratio can be greatly adjusted, and the thermoelectric decoupling is fundamentally realized; a large amount of steam is extracted without independent steam pipelines, cold steam and hot steam are directly punched, so that the inevitable serious safety problem is avoided; the system is simple and reliable, the occupied space is small, and the modification workload is small; the system cost is reduced by 30-70% compared with the conventional decoupling mode; no extra energy consumption and raw material consumption, small operation and maintenance requirements and low operation cost.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention.
The parts in fig. 1 are numbered and named as follows.
The system comprises a boiler 1, a reheater 2, a superheater 3, a high-pressure cylinder 4, an intermediate-pressure cylinder 5, a low-pressure cylinder 6, a generator 7, an inlet butterfly valve 8, a main steam pipe 9, a primary high-side pipe 10, a temperature-reducing water valve 11, a cold-recycling pipe 12, a hot-recycling pipe 13, a middle connection door 14, a high-pressure cylinder inlet valve 15, a medium-pressure reducing valve 16, an injection shut-off valve 17, a low-pressure injection valve 18, an execution mechanism 19, a high-pressure injector 20, a driving steam inlet section 21, a low-pressure steam inlet section 22, an injection exhaust steam outlet section 23, an air distribution desuperheater 24, an air distribution check valve 25, a cold-recycling check valve 26, a high-pressure temperature-reducing decompressor 27, a reheater bypass 28, a reheating regulating valve 29, a condenser 30, desuperheating water C, boiler.
Detailed Description
FIG. 1 is a system schematic and embodiment of the present invention.
The following is a specific example 1 of the present invention.
A high-pressure injection type thermoelectric decoupling heating system comprises a boiler superheater, a reheater, a high-pressure cylinder of a steam turbine, a medium-pressure cylinder, a low-pressure cylinder, a generator, a decoupling injection device, a temperature and pressure reducing device, a connecting pipeline and a matched valve component, wherein the decoupling injection device comprises a high-pressure injector 20, a driving steam inlet section 21 of the high-pressure injector 20 is respectively connected with an outlet of the superheater 3 of the boiler 1, an inlet of the high-pressure cylinder 4 and an inlet of an original high-side pipe 10 through a main steam pipe 9, a low-pressure steam inlet section 22 of the high-pressure injector 20 is respectively connected with a steam exhaust port of the high-pressure cylinder 4, an outlet of the original high-side pipe 10 and an inlet of a cold check valve 26 through a low-pressure injection valve 18 and a high-discharge port section of the cold check valve 12, an injection steam exhaust outlet section 23 of the high-pressure injector 20 is respectively connected with an inlet of the reheater 2 of the boiler 1 and an outlet of the cold check valve 26 through a boiler inlet section, the steam outlet of the reheater 2 is connected to the steam inlet of the intermediate pressure cylinder 5 through the reheater pipe 13, and is also connected to the steam heat consumer Y through the high-pressure temperature and pressure reducing device 27, and the inlet of the reheater 2 is also connected to the hot reheater pipe 13 and the inlet of the high-pressure temperature and pressure reducing device 27 through the reheat regulating valve 29 on the reheater bypass 28.
The hot rehabilitating pipe 13 is also provided with a medium pressure relief valve 16, and an outlet of the medium pressure relief valve 16 is connected to an inlet of the medium pressure cylinder 5 via the intermediate gate 14.
And a gas distribution desuperheater 24 and a gas distribution check valve 25 are arranged on a pipe section between an ejection steam exhaust outlet section 23 of the high-pressure ejector 20 and a boiler inlet section of the cold-recycling pipe 12, wherein a desuperheating water inlet of the gas distribution desuperheater 24 is connected with an outlet of the desuperheating water valve 11.
The high-pressure ejector 20 adopts a stepless regulation joint type structure.
The steam outlet of the intermediate pressure cylinder 5 is connected with the low side steam inlet of the condenser 30 through a low side pipe, when the condenser 30 is used for heating the return water of a heat supply network and the electric load is reduced to be nearly zero, a valve of the low side pipe is opened, the power supply load depends on 0 at the moment, the sum of the high-pressure steam heat supply amount and the heat supply amount of the whole system reaches the maximum value, and the nearly full-load thermoelectric decoupling is realized.
It should be noted that the present invention provides innovative technical principles, technical methods and system configurations for automatically implementing high-pressure steam supply full-load thermoelectric decoupling and flexible transformation, and provides a control method, and specific implementation methods for implementing the above objects, and according to this overall solution, there may be different specific implementation measures and different structural specific implementation devices, and the above specific implementation is only one or more of them, and any other similar simple variant implementation, for example, different ejector structures are adopted; the gas distribution desuperheater 24 is arranged in front of the high-pressure ejector 20; or modifications and the like which may occur to those skilled in the art, are intended to be included within the scope of the present invention.
Claims (5)
1. The utility model provides a high pressure injection type thermoelectric decoupling heating system, includes boiler superheater, reheater, steam turbine high pressure cylinder, intermediate pressure cylinder, low pressure cylinder, generator, decoupling zero injection device, temperature and pressure reduction device, connecting line and supporting valve part, its characterized in that: the decoupling injection device comprises a high-pressure injector (20), a driving steam inlet section (21) of the high-pressure injector (20) is respectively connected with an outlet of a superheater (3) of a boiler (1), an inlet of a high-pressure cylinder (4) and an inlet of an original high side pipe (10) through a main steam pipe (9), a low-pressure steam inlet section (22) of the high-pressure injector (20) is respectively connected with a steam exhaust port of the high-pressure cylinder (4), an outlet of the original high side pipe (10) and an inlet of a cold check valve (26) through a low-pressure injection valve (18) and a high exhaust port section of a cold check pipe (12), an injection steam exhaust outlet section (23) of the high-pressure injector (20) is respectively connected with an inlet of a reheater (2) of the boiler (1) and an outlet of the cold check valve (26) through a boiler inlet section of the cold check pipe (12), a steam outlet of the reheater (2) is connected with a steam inlet of the intermediate pressure cylinder (5) through a hot check pipe (13), the system is also communicated with a steam heat user (Y) through a high-pressure temperature and pressure reducing device (27), and the inlet of the reheater (2) is also connected with the inlets of the heat re-pipe (13) and the high-pressure temperature and pressure reducing device (27) through a reheating regulating valve (29) on a reheater bypass (28).
2. The high-pressure injection type thermoelectric decoupling heating system as claimed in claim 1, wherein the hot recirculation pipe (13) is further provided with a medium pressure reducing valve (16), and an outlet of the medium pressure reducing valve (16) is connected with an inlet of the medium pressure cylinder (5) through a middle connection door (14).
3. The high-pressure injection type thermoelectric decoupling heating system as claimed in claim 2, wherein a gas distribution desuperheater (24) and a gas distribution check valve (25) are arranged on a pipe section between an injection steam exhaust outlet section (23) of the high-pressure injector (20) and a boiler inlet section of the cold-recycling pipe (12), wherein a desuperheating water inlet of the gas distribution desuperheater (24) is connected with an outlet of the desuperheating water valve (11).
4. The high-pressure injection type thermoelectric decoupling heating system as claimed in claim 1, wherein the high-pressure injector (20) adopts a stepless regulation joint type structure.
5. The high-pressure injection type thermoelectric decoupling heating system as claimed in claim 1, wherein the exhaust port of the intermediate pressure cylinder (5) is connected with the low side steam inlet of the condenser (30) through a low side pipe.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111396155A (en) * | 2020-03-24 | 2020-07-10 | 清华大学 | Injection self-balancing high-pressure steam supply full-load thermoelectric decoupling method for medium-pressure valve adjustment |
| CN111396155B (en) * | 2020-03-24 | 2024-04-19 | 清华大学 | Injection self-balancing type high-pressure steam supply full-load thermal decoupling method with medium-pressure valve being regulated |
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2020
- 2020-03-24 CN CN202020390941.1U patent/CN212027896U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111396155A (en) * | 2020-03-24 | 2020-07-10 | 清华大学 | Injection self-balancing high-pressure steam supply full-load thermoelectric decoupling method for medium-pressure valve adjustment |
| CN111396155B (en) * | 2020-03-24 | 2024-04-19 | 清华大学 | Injection self-balancing type high-pressure steam supply full-load thermal decoupling method with medium-pressure valve being regulated |
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