CN111237735A - Emergency industrial steam supply system for realizing shutdown and non-shutdown of large coal-fired generator set - Google Patents
Emergency industrial steam supply system for realizing shutdown and non-shutdown of large coal-fired generator set Download PDFInfo
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- CN111237735A CN111237735A CN202010246017.0A CN202010246017A CN111237735A CN 111237735 A CN111237735 A CN 111237735A CN 202010246017 A CN202010246017 A CN 202010246017A CN 111237735 A CN111237735 A CN 111237735A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B33/00—Steam-generation plants, e.g. comprising steam boilers of different types in mutual association
- F22B33/18—Combinations of steam boilers with other apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
- F22D1/32—Feed-water heaters, i.e. economisers or like preheaters arranged to be heated by steam, e.g. bled from turbines
- F22D1/325—Schematic arrangements or control devices therefor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
- F22D1/50—Feed-water heaters, i.e. economisers or like preheaters incorporating thermal de-aeration of feed-water
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22G—SUPERHEATING OF STEAM
- F22G5/00—Controlling superheat temperature
- F22G5/12—Controlling superheat temperature by attemperating the superheated steam, e.g. by injected water sprays
- F22G5/123—Water injection apparatus
- F22G5/126—Water injection apparatus in combination with steam-pressure reducing valves
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Control Of Turbines (AREA)
Abstract
The invention belongs to the technical field of emergency industrial steam supply systems, in particular to an emergency industrial steam supply system for realizing shutdown and non-shutdown of a large coal-fired generator set, which is characterized in that a bypass steam supply system is added on the basis of the original system, 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 valve, and then enters a hot re-extraction industrial steam supply system through an outlet at the reheater side of the boiler so as to fulfill the aim of continuously meeting the requirement of industrial steam supply when the steam turbine or the generator breaks down and overhauls, improve the safety and reliability of emergency industrial steam supply of the generator set, in addition, water entering the boiler is subjected to deoxidization and primary temperature raising through a deaerator, secondary temperature raising is realized through a No. 2 high-pressure heater, and the, the deaerator and the No. 2 high-pressure heater steam source are self-cooled and re-steamed.
Description
Technical Field
The invention belongs to the technical field of emergency industrial steam supply systems, and particularly relates to an emergency industrial steam supply system for realizing shutdown and non-stop of a large coal-fired generator set.
Background
The design specification of large and medium-sized thermal power plants (GB 50660-2011) specifies that: the cogeneration unit should give consideration to two functions of power generation and heat supply in design, and should have higher heat supply reliability during external heat supply. For the heat supply type steam turbine, one boiler is preferably arranged in one machine, 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 and 60 to 75 percent (the upper limit is taken in severe cold regions) of winter heating, ventilation and domestic heat required by continuous production of thermal users, other standby heat sources are arranged by a heat supply network. When equipment such as a steam turbine and a generator of a heat supply unit breaks down in a heat supply period and needs to be overhauled, the problems that heat supply does not reach the standard or heat supply stops, steam supply stops and the like can be caused, heating feeling of residents is influenced, production loss of enterprises is caused, and social influence is large.
The high-pressure bypass matches the heat and extracts the steam external supply technical room and realizes the single reheat coal-fired generating set shuts down the only way of the emergent industrial heat supply of not shutting down the stove: the new boiler steam is subjected to temperature and pressure reduction through the high-pressure bypass to the high-pressure bypass pipe, enters the boiler reheater to be heated, and is externally supplied with heat through the hot re-extraction steam supply pipeline, so that steam supply of different furnaces is realized by stopping the boiler.
Disclosure of Invention
The invention provides an emergency industrial steam supply system for realizing shutdown and non-stop of a large coal-fired generator set, which can solve the problems pointed out in the background technology.
An emergency industrial steam supply system for realizing shutdown without stopping of a large coal-fired generator set comprises a boiler, a high-pressure cylinder, an intermediate-pressure cylinder, a low-pressure cylinder, a generator, a high-pressure cylinder steam inlet valve group, a high-exhaust check valve, an intermediate-pressure cylinder steam inlet valve group, a condenser, a condensate pump, a deaerator, an electric water feed pump, a No. 2 high-pressure heater and a plurality of valve groups, wherein a high-pressure bypass pipe is added at a main steam outlet pipe of the boiler, a steam outlet end of the high-pressure bypass pipe is converged with high-pressure cylinder steam exhaust and jointly connected into a reheater of the boiler, a high-pressure bypass temperature and pressure reducing valve group is arranged on the high-pressure bypass pipe and is provided with temperature reducing water through a first temperature reducing water pipe, the first temperature reducing water pipe is provided with the valve group, a steam supply pipe is added at a reheater steam outlet pipe of the reheater, and is directly connected with an industrial steam supply outside a plant area, the steam supply pipe is provided with an industrial steam supply system valve set, the industrial steam supply system valve set provides desuperheating water through a second desuperheating water pipe, and the second desuperheating water pipe is provided with a valve set.
Preferably, the first temperature reduction water pipe is connected with an outlet of the No. 2 high-pressure heater, and temperature reduction water is provided through the No. 2 high-pressure heater.
Preferably, the second temperature reduction water pipe is connected with an outlet of the No. 2 high-pressure heater, and the temperature reduction water is provided through the No. 2 high-pressure heater.
The invention provides an emergency industrial steam supply system for realizing shutdown and non-shutdown of a large coal-fired generator set, 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 a boiler enters a reheater side of the boiler after being subjected to temperature and pressure reduction through a high-pressure bypass valve, and then enters a hot re-extraction industrial steam supply system through an outlet of the reheater side of the boiler, so that the aim of continuously meeting the industrial steam supply requirement when the steam turbine or the generator breaks down and overhauls is achieved, the safety reliability of emergency industrial steam supply of the generator set is improved, in addition, water entering the boiler is subjected to deoxidization and primary temperature increase through a deaerator, secondary temperature increase is achieved through a No. 2 high-pressure heater, the safe operation of water on the boiler is ensured, and the deaerator and the No. 2 high-pressure heater steam source takes self-.
Drawings
Figure 1 is a schematic view 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-high pressure bypass temperature and pressure reducing valve group; 7-high-discharge check valve; 8-high pressure cylinder steam inlet valve group; 9-an intermediate pressure cylinder steam inlet valve group; 10-valve group of industrial steam supply system; 11-a condenser; 12-a condensate pump 13-a deaerator; 14-electric feed water pump; no. 15-2 high pressure heater; 16-20-valve group; 21-main steam outlet pipe; 22-high pressure bypass line; 23-a first temperature-reducing water pipe; 24-reheater steam outlet pipe; 25-a steam supply pipe; 26-a second temperature reduction water pipe.
Detailed Description
An embodiment of the present invention will be described in detail below with reference to the accompanying drawings, but it should be understood that the scope of the present invention is not limited to the embodiment.
Example (b):
as shown in fig. 1, an emergency industrial steam supply system for realizing shutdown and non-shutdown of a large-scale coal-fired power generating set according to an embodiment of the present invention includes a boiler 1, a high-pressure cylinder 2, a medium-pressure cylinder 3, a low-pressure cylinder 4, a generator 5, a high-pressure cylinder steam inlet valve group 8, a high-discharge check valve 7, a medium-pressure cylinder steam inlet valve group 9, a condenser 11, a condensate pump 12, a deaerator 13, an electric water feed pump 14, a No. 2 high-pressure heater 15, and a plurality of valve groups 16, 17, and 20, where the above structure is a conventional structure, and a bypass steam supply system is added on the basis of the conventional structure, and specifically includes: the main steam of boiler 1 goes out steam pipe 21 department and increases high-pressure bypass pipe 22, high-pressure bypass pipe 22 goes out the steam end and joins with high-pressure jar 2 steam extraction to insert jointly in the reheater of boiler 1, be equipped with high-pressure bypass temperature reduction pressure reducing valve group 6 on the high-pressure bypass pipe 22, high-pressure bypass temperature reduction pressure reducing valve group 6 provides the temperature reduction water through first temperature reduction water pipe 23, first temperature reduction water pipe 23 and No. 2 high pressure heater 15 exit linkage provide the temperature reduction water through No. 2 high pressure heater 15, be equipped with valve group 18 on the first temperature reduction water pipe 23, reheater's reheater goes out steam pipe 24 department and increases steam supply pipe 25, and steam supply pipe 25 directly supplies with the outer confession of factory's industry steam supply and is connected, be equipped with industry steam supply system valve group 10 on steam supply pipe 25, industry steam supply system valve group 10 provides the temperature reduction water through second temperature reduction water pipe 26, be equipped with valve group 19 on the second temperature reduction water pipe 26, the second temperature-reducing water pipe 26 is connected with the No. 2 high-pressure heater 15, and temperature-reducing water is provided through the No. 2 high-pressure heater 15.
The working principle of the invention is as follows: when the steam turbine or the generator has faults and needs to be shut down for maintenance, the emergency industrial steam supply system of the invention is operated in order to avoid the production interruption of a steam enterprise caused by the shutdown of the industrial steam supply system. The high-pressure cylinder steam inlet valve group 8, the intermediate-pressure cylinder steam inlet valve group 9 and the high-exhaust check valve 7 are closed, the generator 6 is shut down, the steam turbine consisting of the high-pressure cylinder 2, the intermediate-pressure cylinder 3 and the low-pressure cylinder 4 stops running or is in a rotary standby state, and in order to prevent air from leaking, the generator set vacuumizing system normally runs. The boiler 1 keeps running above the minimum stable combustion load, the new steam at the outlet enters the high-pressure bypass pipe 22 through the high-pressure bypass temperature and pressure reducing device 6, the temperature reducing water is provided by the water supply system at the outlet of the No. 2 high-pressure heater 15, and at the moment, the valve sets 6 and 18 are opened. Except for one part of cold reheat steam which is supplied to the deaerator 13 and the No. 2 high-pressure heater 15, the other part of cold reheat steam enters the boiler 1 to absorb heat again, outlet steam is supplied to the outside industry after being subjected to temperature and pressure reduction through an industrial steam supply valve group 10 through a steam supply pipe 25, the temperature reduction water is taken from the outlet of the No. 2 high-pressure heater 15, and a valve group 19 is opened. The industrial steam supply pressure and temperature are adjusted by the boiler 1, the electric feed water pump 14, the high-pressure bypass temperature and pressure reducing device 6 and other equipment according to the production requirements of external steam enterprises. In order to ensure the steam-water balance of the coal-fired power generating set, low-temperature demineralized water with equal industrial steam supply flow is supplemented to a unit condenser 11, the low-temperature demineralized water is boosted by a condensate pump 12 and then sequentially enters a low-pressure heater, a deaerator 13, a water supply pump 14 and a No. 2 high-pressure heater 15 and then enters a boiler, potential safety hazards caused by cold water entering the boiler and oxygen in the water are avoided, the emergency industrial steam supply system is put into the deaerator 13 and the No. 2 high-pressure heater 15 to realize thermal deoxidization and step heating, a heating steam source is taken from cold steam, valve groups 16 and 17 are opened, and the drain water of the No. 2 high-pressure heater 15 enters.
The above disclosure is only for a few specific embodiments of the present invention, however, the present invention is not limited to the above embodiments, and any variations that can be made by those skilled in the art are intended to fall within the scope of the present invention.
Claims (3)
1. The utility model provides a realize that large-scale coal-fired generating set shuts down emergent industry steam supply system that does not stop stove, includes boiler (1), high pressure jar (2), intermediate pressure jar (3), low pressure jar (4), generator (5), high pressure jar admission valve group (8), high discharge check valve (7), intermediate pressure jar admission valve group (9), condenser (11), condensate pump (12), oxygen-eliminating device (13), electronic feed water pump (14), No. 2 high pressure feed water heater (15) and a plurality of valve group (16, 17, 20), its characterized in that: a high-pressure bypass pipe (22) is added at a main steam outlet pipe (21) of the boiler (1), the steam outlet end of the high-pressure bypass pipe (22) is converged with the exhaust steam of the high-pressure cylinder (2), and are jointly connected into a reheater of the boiler (1), a high-pressure bypass temperature and pressure reducing valve group (6) is arranged on the high-pressure bypass pipe (22), the high-pressure bypass temperature and pressure reducing valve group (6) provides temperature reducing water through a first temperature reducing water pipe (23), a valve group (18) is arranged on the first temperature-reducing water pipe (23), a steam supply pipe (25) is added at a reheater steam outlet pipe (24) of the reheater, the steam supply pipe (25) is directly connected with the external supply of industrial steam in a plant area, the steam supply pipe (25) is provided with an industrial steam supply system valve set (10), the industrial steam supply system valve set (10) provides desuperheating water through a second desuperheating water pipe (26), and the second desuperheating water pipe (26) is provided with a valve set (19).
2. The emergency industrial steam supply system for realizing shutdown and non-stop of the large coal-fired power generating unit according to claim 1, is characterized in that: the first temperature-reducing water pipe (23) is connected with an outlet of the No. 2 high-pressure heater (15), and temperature-reducing water is provided through the No. 2 high-pressure heater (15).
3. The emergency industrial steam supply system for realizing shutdown and non-stop of the large coal-fired power generating unit according to claim 1, is characterized in that: the second temperature-reducing water pipe (26) is connected with the outlet of the No. 2 high-pressure heater (15), and temperature-reducing water is provided through the No. 2 high-pressure heater (15).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010246017.0A CN111237735A (en) | 2020-03-31 | 2020-03-31 | Emergency industrial steam supply system for realizing shutdown and non-shutdown of large coal-fired generator set |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010246017.0A CN111237735A (en) | 2020-03-31 | 2020-03-31 | Emergency industrial steam supply system for realizing shutdown and non-shutdown of large coal-fired generator set |
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| Publication Number | Publication Date |
|---|---|
| CN111237735A true CN111237735A (en) | 2020-06-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010246017.0A Pending CN111237735A (en) | 2020-03-31 | 2020-03-31 | Emergency industrial steam supply system for realizing shutdown and non-shutdown of large coal-fired generator set |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112303610A (en) * | 2020-10-30 | 2021-02-02 | 西安热工研究院有限公司 | Operation system and method for recovering high-energy water in shutdown and non-shutdown operation mode |
| 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 |
-
2020
- 2020-03-31 CN CN202010246017.0A patent/CN111237735A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112303610A (en) * | 2020-10-30 | 2021-02-02 | 西安热工研究院有限公司 | Operation system and method for recovering high-energy water in shutdown and non-shutdown operation mode |
| 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 |
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