CN212154886U - Industrial steam residual pressure cascade utilization system applied to coal-fired steam supply unit in shutdown non-shutdown mode - Google Patents
Industrial steam residual pressure cascade utilization system applied to coal-fired steam supply unit in shutdown non-shutdown mode Download PDFInfo
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- CN212154886U CN212154886U CN202020445498.3U CN202020445498U CN212154886U CN 212154886 U CN212154886 U CN 212154886U CN 202020445498 U CN202020445498 U CN 202020445498U CN 212154886 U CN212154886 U CN 212154886U
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Abstract
The utility model belongs to the technical field of energy conservation in the coal-fired industry steam supply unit heat supply reliability field, in particular to be applied to the surplus pressure cascade utilization system of industrial steam under the mode that the coal-fired steam supply unit does not stop the stove, increase bypass combined heating system and direct temperature and pressure reduction direct supply system on the basis of original system, when steam turbine or generator need overhaul under the fault condition, steam turbine and generator halt, the main steam of boiler enters into the reheater side of boiler after the temperature and pressure reduction of high pressure bypass temperature and pressure reduction valve group, then enter into the boiler reheater after the heat absorption of boiler reheater and enter into heat supply steam backpressure steam turbine generator set to do work and drive the power generation, take the power plant and use the electric system, improve the heat economy of emergency heating system; if heat supply steam backpressure turbo generator set trouble, changeable to direct desuperheating decompression direct supply system, the steam of boiler reheater export directly desuperheating decompression gets into the master pipe of whole factory industry steam supply, and the desuperheating water is got from the oxygen-eliminating device and is gone out water, and fail safe nature is high, and the guarantee system heat supply is stable.
Description
Technical Field
The utility model relates to a be applied to coal-fired steam supply unit and shut down industrial steam residual pressure step under the mode of not blowing out and utilize system's step and utilize system belongs to the energy-conserving technical field in the coal-fired industry steam supply unit heat supply reliability field.
Background
With the continuous and deep promotion of the atmospheric pollution prevention and control work, the dispersed coal-fired boiler rooms with high pollution and high energy consumption are gradually shut down, the gas-using enterprises enter a newly-built industrial park near the coal-fired unit, and the coal-fired enterprises are clean and centralized in industrial gas supply, so that the total consumption control of regional coal-fired and fuel oil is facilitated. According to design specifications of large and medium-sized thermal power plants (GB 50660-2011), a cogeneration unit has two functions of power generation and heat supply in design, and has high heat supply reliability during external heat supply. For the heat supply type steam turbine, one machine is preferably provided with one furnace, when one steam boiler with the largest capacity is stopped, if the external steam supply capacity of the other boilers cannot meet the requirements of 100 percent of production steam consumption, 60 to 75 percent of winter heating, ventilation and domestic heat required by continuous production of thermal users, other standby heat sources are configured by a heat supply network. Different from the heating of residents in northern areas in winter, if the amount reduction, pressure reduction and even supply stop of industrial steam supply occur, the adverse effects of production reduction and production stop of steam-using enterprises and the like, which cause the production damage of the enterprises and the like, are caused, and from this viewpoint, the realization of the high safety and reliability of stable and continuous external steam supply of the large coal-fired generator set is particularly important.
For a heat supply power plant provided with a plurality of coal-fired power generating sets, a boiler heats water through raw coal combustion to generate high-temperature and high-pressure steam, the steam enters a steam turbine to generate electricity and supply heat industrially, if equipment such as the steam turbine or a generator breaks down and needs to be stopped for maintenance, the industrial steam supply system of the set is stopped, and the production reduction and production stop loss of steam-using enterprises are serious. In order to improve the reliability of the industrial steam supply system, the system has the emergency industrial steam supply capacity under extreme conditions, and the shutdown emergency industrial heat supply reconstruction of different furnaces of the bypass combined heat supply system can be implemented. In order to improve the through-flow capacity of the bypass combined heating system, the steam pressure entering and exiting the boiler reheater is generally controlled to be higher, and the steam is supplied to the outside after temperature and pressure reduction. In order to avoid the waste of steam excess pressure caused by the traditional mode that the heat supply steam of the bypass combined industrial heat supply system directly enters the steam supply main pipe through temperature reduction and pressure reduction, a steam turbine generator unit is needed to recycle the part of industrial steam excess pressure, and the power utilization system of the plant is waited.
SUMMERY OF THE UTILITY MODEL
The utility model provides a be applied to coal-fired steam supply unit and shut down the industry steam residual pressure step under the mode of not blowing out and utilize the system, can solve the problem that points out among the background art.
A cascade utilization system of industrial steam excess pressure applied to a coal-fired steam supply unit in a non-stop mode comprises a boiler, a high-pressure cylinder, a medium-pressure cylinder, a low-pressure cylinder, a generator, a main steam valve, a medium-pressure combined steam inlet valve, a high-exhaust check valve and a plurality of valve sets, namely a first valve set, a second valve set, a third valve set, a fourth valve set, a fifth valve set, a connecting pipeline, a water replenishing pump, a condenser, a condensate pump, a deaerator, an electric water feeding pump and a high-pressure heater, wherein a high-pressure bypass pipe is additionally arranged at a main steam outlet pipe of the boiler, the steam outlet end of the high-pressure bypass pipe is connected into a reheater of the boiler, a high-pressure bypass shutoff valve and a high-pressure bypass temperature and pressure reducing valve set are arranged on the high-pressure bypass temperature and pressure reducing valve set, the high-pressure bypass temperature and pressure reducing valve set provides temperature reducing water through a first temperature reducing water pipe, and a, the reheater of reheater goes out steam pipe department and increases first steam supply pipe, be equipped with seventh valve group and industrial steam back pressure turbo generator set on the first steam supply pipe, industrial steam back pressure turbo generator set's steam extraction end and industry supply the female union coupling of steam.
Preferably, the first steam supply pipe is connected into the second steam supply pipe through a tee joint, an eighth valve set is arranged on the second steam supply pipe, the eighth valve set provides desuperheating water through a second desuperheating water pipe, the steam exhaust end of the second steam supply pipe is directly connected with an industrial steam supply main pipe, and a ninth valve set is arranged on the second desuperheating water pipe.
Preferably, the second temperature reduction water pipe is connected with an outlet of the deaerator, and the temperature reduction water is taken from water discharged from the deaerator.
Preferably, the first temperature-reducing water pipe is connected with an outlet of the high-pressure heater, and the temperature-reducing water is provided by the high-pressure heater.
The utility model provides an industrial steam excess pressure cascade utilization system applied to a coal-fired steam supply unit in a shutdown and non-shutdown mode, when a steam turbine or a generator needs to be overhauled in a fault state, the steam turbine and the generator are shut down, main steam of the boiler enters a reheater side of the boiler after being subjected to temperature and pressure reduction through a high-pressure bypass temperature and pressure reduction valve group, then enters a heat supply steam backpressure steam turbine generator unit to drive power generation after entering a boiler reheater to absorb heat, and a plant power system is connected, so that the heat economy of an emergency heat supply system is improved; if heat supply steam backpressure turbo generator set trouble, changeable to direct desuperheating decompression direct supply system, the steam of boiler reheater export directly desuperheating decompression gets into the master pipe of whole factory industry steam supply, and the desuperheating water is got from the oxygen-eliminating device and is gone out water, also can get from the oxygen-eliminating device that has just been worked on, and fail safe nature is high.
Drawings
Figure 1 is a schematic diagram of the system of the present invention,
description of reference numerals:
reference numbers in the figures: 1-a boiler; 2-high pressure cylinder; 3-a medium pressure cylinder; 4-low pressure cylinder; 5-a generator; 6-main steam valve; 7-medium pressure combined steam inlet valve; 8-high pressure bypass shutoff valve; 9-high pressure bypass temperature and pressure reducing valve group; 10-high-discharge check valve; 11. a sixth valve group; 12. a first valve group; 13. a second valve group; 14. a third valve group; 15. a seventh valve group; 16. an eighth valve group; 17. a tenth valve group; 18. a ninth valve group; 19. a fourth valve group; 20. a fifth valve group; 21-a water replenishing pump; 22-a condenser; 23-a condensate pump 24-a deaerator; 25-an electric feed pump; 26-a high pressure heater; 27-industrial steam back pressure steam turbine generator unit; 28-main steam outlet pipe; 29-high pressure bypass line; 30-a first temperature-reducing water pipe; 31-reheater steam outlet pipe; 32-a first steam supply pipe; 33-a second steam supply pipe; 34-a second temperature reduction water pipe.
Detailed Description
In the following, an embodiment of the present invention will be described in detail with reference to the drawings, but it should be understood that the scope of the present invention is not limited by the embodiment.
Example 1:
as shown in fig. 1, the embodiment of the utility model provides a be applied to coal-fired steam supply unit and shut down industrial steam excess pressure cascade utilization system under the mode of not blowing out, including boiler 1, high-pressure cylinder 2, intermediate pressure cylinder 3, low-pressure cylinder 4, generator 5, main steam valve 6, the steam inlet valve 7 is united to the intermediate pressure, high-pressure discharge check valve 10, a plurality of valve group, first valve group 12 promptly, second valve group 13, third valve group 14, fourth valve group 19, fifth valve group 20, connecting line, moisturizing pump 21, condenser 22, condensate pump 23, 24 electric feed water pump 25 of oxygen-eliminating device, high pressure feed water heater 26, above structure is current structure, increases bypass joint heating system on current structure's basis, specifically is: a high-pressure bypass pipe 29 is additionally arranged at a main steam outlet pipe 28 of the boiler 1, the high-pressure bypass pipe 29 is communicated with the main steam outlet pipe 28 in a tee joint mode and the like, the steam outlet end of the high-pressure bypass pipe 29 is connected into a reheater of the boiler 1 in a tee joint mode and the like, a high-pressure bypass shutoff valve 8 and a high-pressure bypass temperature and pressure reducing valve group 9 are arranged on the high-pressure bypass pipe 29, the high-pressure bypass temperature and pressure reducing valve group 9 provides temperature reducing water through a first temperature reducing water pipe 30, a sixth valve group 11 is arranged on the first temperature reducing water pipe 30, the first temperature reducing water pipe 30 is connected with a high-pressure heater 26, and the temperature reducing water is provided through a high-pressure heater; reheater goes out steam pipe 31 department and increases first steam supply pipe 32, be equipped with seventh valve group 15 and industrial steam back pressure turbo generator unit 27 on the first steam supply pipe 32, industrial steam back pressure turbo generator unit 27's steam exhaust end and industry supply the female union coupling of vapour to steam back pressure turbo generator unit 27 and industry supply to be equipped with tenth valve group 17 between the female union coupling of vapour.
Example 2:
on the basis of the embodiment 1, a direct temperature and pressure reducing direct supply system is added, and specifically comprises the following steps: first steam supply pipe 32 passes through the tee bend form and inserts second steam supply pipe 33, and the access point that second steam supply pipe 33 is located seventh valve group 15's front side, be equipped with eighth valve group 16 on the second steam supply pipe 33, eighth valve group 16 provides the desuperheating water through second desuperheating water pipe 34, second desuperheating water pipe 34 is connected with oxygen-eliminating device 24, and the desuperheating water is got from oxygen-eliminating device 24 and is gone out water, also accessible machine play water, second steam supply pipe 33 steam exhaust end is direct to supply female union coupling of steam with the industry, be equipped with ninth valve group 18 on the second desuperheating water pipe 34.
If heat supply steam backpressure turbo generator set 27 trouble in this system, changeable to direct supply system of reducing temperature and pressure, seventh valve group 15 this moment, tenth valve group 17 are closed, and eighth valve group 16 is opened, and the steam of boiler reheater 1 export gets into the industry of whole factory through the direct temperature and pressure reduction of second steam supply pipe 33 and supplies the female pipe of vapour, and ninth valve group 18 is opened, and the desuperheating water is got from the oxygen-eliminating device and is gone out water, also can get from the oxygen-eliminating device that has just been worked a telephone.
The utility model discloses a theory of operation: in order to improve the reliability of the heating system, the coal-fired unit has the emergency industrial heating capacity under the condition of extreme conditions, such as the shutdown condition of a certain or all faults of a steam turbine or a generator, and can implement the shutdown emergency industrial heating transformation of different furnaces of the bypass combined heating system. At the moment, the bypass combined heat supply mode is put into operation, the main steam valve 6, the medium-pressure combined steam inlet valve 7, the high-exhaust check valve 10 and the four-section steam extraction to deaerator steam inlet pipeline valve 14 are all closed, the generator 6 stops operating, the steam turbine consisting of the high-pressure cylinder 2, the medium-pressure cylinder 3 and the low-pressure cylinder 4 stops operating or is in a rotating standby state, and the generator set vacuumizing system normally operates to prevent air from leaking. The boiler 1 keeps running above the minimum stable combustion load, the new steam at the outlet enters a high-pressure bypass pipe 29 through a high-pressure bypass shutoff valve 8 and a temperature and pressure reducing valve group 9 for reducing temperature and pressure, at the moment, a sixth valve group 11 is opened, and the temperature reducing water is provided by a water supply system at the outlet of a high-pressure heater 26 or a machine-approaching water supply main pipe; the cold reheat steam is supplied to a deaerator 24 and a high-pressure heater 26 in part, and the rest of the cold reheat steam enters a reheater of the boiler 1 to absorb heat again so as to protect the wall temperature of the reheater of the boiler to be within a safe range; the seventh valve group 15 and the tenth valve group 17 are opened, outlet steam enters a heat supply steam backpressure steam turbine generator unit 27 through a first steam supply pipe 32 to do work power generation, a service power system of the unit is waited, exhaust steam of the heat supply steam backpressure steam turbine generator unit 27 enters a whole plant industrial steam supply main pipe, desalted water enters a condenser 22 after being pressurized by a water supplementing pump 21 to maintain steam-water balance of the unit, the desalted water enters a deaerator 24, an electric water supply pump 25 and a high-pressure heater 26 after being pressurized by a condensate pump 23 and enters a boiler, in order to avoid potential safety hazards caused by cold water entering the boiler and oxygen in the water, a steam source heated by the deaerator 24 and the high-pressure heater 26 is self-cooled and re-steamed, and the steam source can also be taken from a machine-approaching auxiliary steam header, the high-pressure heater 26 drains.
If heat supply steam backpressure turbo generator set 27 trouble in this system, changeable to direct supply system of reducing temperature and pressure, seventh valve group 15 this moment, tenth valve group 17 are closed, and eighth valve group 16 is opened, and the steam of boiler reheater 1 export gets into the industry of whole factory through the direct temperature and pressure reduction of second steam supply pipe 33 and supplies the female pipe of vapour, and ninth valve group 18 is opened, and the desuperheating water is got from the oxygen-eliminating device and is gone out water, also can get from the oxygen-eliminating device that has just been worked a telephone.
The above disclosure is only for a few specific embodiments of the present invention, however, the present invention is not limited to the embodiments, and any changes that can be considered by those skilled in the art shall fall within the protection scope of the present invention.
Claims (4)
1. The utility model provides a be applied to coal-fired steam supply unit and shut down industry steam residual pressure cascade utilization system under mode of not blowing out, including boiler (1), high-pressure cylinder (2), intermediate pressure cylinder (3), low pressure cylinder (4), generator (5), steam main valve (6), the steam admission valve (7) are united to the intermediate pressure, check valve (10) are arranged to the height, a plurality of valve group, first valve group (12) promptly, second valve group (13), third valve group (14), fourth valve group (19), fifth valve group (20), connecting line, moisturizing pump (21), condenser (22), condensate pump (23), oxygen-eliminating device (24), electronic feed pump (25), high pressure feed water heater (26), its characterized in that: boiler (1) main steam goes out steam pipe (28) department and increases high pressure bypass pipe (29), high pressure bypass pipe (29) play steam end inserts in the reheater of boiler (1), be equipped with high pressure bypass shutoff valve (8) and high pressure bypass temperature and pressure reduction valve group (9) on high pressure bypass pipe (29), high pressure bypass temperature and pressure reduction valve group (9) provide the temperature reduction water through first temperature reduction water pipe (30), be equipped with sixth valve group (11) on first temperature reduction water pipe (30), reheater's reheater goes out steam pipe (31) department and increases first steam supply pipe (32), be equipped with seventh valve group (15) and industrial steam backpressure turbo generator set (27) on first steam supply pipe (32), the female steam end and the industrial steam supply union coupling of industrial steam backpressure turbo generator set (27).
2. The system of claim 1, wherein the cascade utilization system comprises: first steam supply pipe (32) insert second steam supply pipe (33) through the tee bend form, be equipped with eighth valve group (16) on second steam supply pipe (33), eighth valve group (16) provide the desuperheating water through second desuperheating water pipe (34), second steam supply pipe (33) steam exhaust end is direct to be connected with industry supplies the female union coupling of vapour, be equipped with ninth valve group (18) on second desuperheating water pipe (34).
3. The system for utilizing the excess pressure of the industrial steam in the shutdown and non-stop mode of the coal-fired steam supply unit according to claim 2, characterized in that: the second temperature-reducing water pipe (34) is connected with an outlet of the deaerator (24), and the temperature-reducing water is taken from the water outlet of the deaerator (24).
4. The system for utilizing the industrial steam residual pressure gradient applied to the shutdown and non-stop mode of the coal-fired steam supply unit according to any one of claims 1 to 3, is characterized in that: the first temperature-reducing water pipe (30) is connected with the outlet of the high-pressure heater (26) and provides temperature-reducing water through the high-pressure heater (26).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020445498.3U CN212154886U (en) | 2020-03-31 | 2020-03-31 | Industrial steam residual pressure cascade utilization system applied to coal-fired steam supply unit in shutdown non-shutdown mode |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020445498.3U CN212154886U (en) | 2020-03-31 | 2020-03-31 | Industrial steam residual pressure cascade utilization system applied to coal-fired steam supply unit in shutdown non-shutdown mode |
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| CN212154886U true CN212154886U (en) | 2020-12-15 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112833378A (en) * | 2020-12-28 | 2021-05-25 | 东方电气集团东方汽轮机有限公司 | Reheating system capable of improving heat supply capacity |
| CN113280320A (en) * | 2021-06-21 | 2021-08-20 | 西安热工研究院有限公司 | System for greatly improving industrial steam supply reliability based on electric heating heat storage technology |
| CN114508397A (en) * | 2022-02-14 | 2022-05-17 | 西安西热节能技术有限公司 | System and method for utilizing high-parameter industrial extraction steam waste heat |
| CN117524524A (en) * | 2023-11-21 | 2024-02-06 | 华能山东石岛湾核电有限公司 | Shutdown non-shutdown system for high-temperature gas cooled reactor |
-
2020
- 2020-03-31 CN CN202020445498.3U patent/CN212154886U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112833378A (en) * | 2020-12-28 | 2021-05-25 | 东方电气集团东方汽轮机有限公司 | Reheating system capable of improving heat supply capacity |
| CN113280320A (en) * | 2021-06-21 | 2021-08-20 | 西安热工研究院有限公司 | System for greatly improving industrial steam supply reliability based on electric heating heat storage technology |
| CN114508397A (en) * | 2022-02-14 | 2022-05-17 | 西安西热节能技术有限公司 | System and method for utilizing high-parameter industrial extraction steam waste heat |
| CN114508397B (en) * | 2022-02-14 | 2023-08-15 | 西安西热节能技术有限公司 | System and method for utilizing waste heat of high-parameter industrial extraction steam |
| CN117524524A (en) * | 2023-11-21 | 2024-02-06 | 华能山东石岛湾核电有限公司 | Shutdown non-shutdown system for high-temperature gas cooled reactor |
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