CN111734503B - Combined cycle steam extraction and supplement system for increasing steam supply adjusting range - Google Patents
Combined cycle steam extraction and supplement system for increasing steam supply adjusting range Download PDFInfo
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- CN111734503B CN111734503B CN202010734717.4A CN202010734717A CN111734503B CN 111734503 B CN111734503 B CN 111734503B CN 202010734717 A CN202010734717 A CN 202010734717A CN 111734503 B CN111734503 B CN 111734503B
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- 238000000605 extraction Methods 0.000 title claims abstract description 42
- 239000013589 supplement Substances 0.000 title claims abstract description 10
- 230000001502 supplementing effect Effects 0.000 claims abstract description 43
- 230000001105 regulatory effect Effects 0.000 claims abstract description 38
- 239000002918 waste heat Substances 0.000 claims abstract description 29
- 238000005192 partition Methods 0.000 claims abstract description 24
- 238000009833 condensation Methods 0.000 claims abstract description 7
- 230000005494 condensation Effects 0.000 claims abstract description 7
- 238000010248 power generation Methods 0.000 claims abstract description 7
- 230000007363 regulatory process Effects 0.000 claims abstract description 4
- 230000008901 benefit Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 230000004888 barrier function Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D17/00—Regulating or controlling by varying flow
- F01D17/10—Final actuators
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/10—Adaptations for driving, or combinations with, electric generators
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K11/00—Plants characterised by the engines being structurally combined with boilers or condensers
- F01K11/02—Plants characterised by the engines being structurally combined with boilers or condensers the engines being turbines
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/16—Combined cycle power plant [CCPP], or combined cycle gas turbine [CCGT]
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
- Control Of Turbines (AREA)
Abstract
The invention discloses a combined cycle steam extraction and supplement system for increasing a steam supply adjusting range, belongs to the field of steam turbines, and aims to solve the problems that an E-cascade circulating steam system adopts a double-pressure system, the steam supply adjusting range is small, and the stability of the steam system is affected. The system comprises three pressure grade steam sources and an adjusting unit; the waste heat boiler outputs three pressure grade steam sources of high pressure steam, medium pressure steam and low pressure steam, and the high pressure steam is used as a main power steam source of the steam turbine; the medium-pressure steam source is used as a steam source of a forward steam supply network and a primary steam supplementing steam source of the steam turbine at the same time; the low-pressure steam source is used as a secondary steam supplementing steam source of the steam turbine, the regulating units are arranged before the three steam sources reach the steam turbine, and the system steam supply regulating process is as follows: when the system is in pure condensation operation, the rotary partition plate of the steam turbine is fully opened, and medium-pressure steam output by the waste heat boiler is fully used as a primary steam supplementing steam source to enter the steam turbine for power generation; when the system is in the steam extraction and heat supply mode of operation, the rotating partition plate of the steam turbine is partially opened.
Description
Technical Field
The invention relates to a technology for adjusting the steam supply range of a gas-steam combined cycle steam supply system, and belongs to the field of steam turbines.
Background
Normally, the E-group combined circulation steam system adopts a double-pressure system, if the steam turbine supplies steam externally, the normal adjustable range of the steam supply is narrow, the steam supply is seriously influenced by the load of the unit, and when the steam supply is large, the stability of the steam system is influenced to a certain extent.
Disclosure of Invention
The invention aims to solve the problems that an E-cascade circulating steam system adopts a double-pressure system, has a small steam supply adjusting range and affects the stability of the steam system, and provides a combined circulating steam extraction and steam supplementing system for increasing the steam supply adjusting range.
The invention relates to a combined cycle steam extraction and supplement system for increasing a steam supply adjusting range, which comprises three pressure grade steam sources and an adjusting unit;
The waste heat boiler outputs three pressure grade steam sources of high pressure steam, medium pressure steam and low pressure steam, wherein the high pressure steam is used as a main power steam source of the steam turbine; the medium-pressure steam source is used as a steam source of a forward steam supply network and a primary steam supplementing steam source of the steam turbine at the same time; the low-pressure steam source is used as a secondary steam supplementing steam source of the steam turbine, the regulating units are arranged before the three steam sources reach the steam turbine, and the system steam supply regulating process is as follows:
when the system is in pure condensation operation, the rotary partition 400 of the steam turbine is fully opened, and medium-pressure steam output by the waste heat boiler is fully used as a primary steam supplementing source to enter the steam turbine for power generation;
When the system is in the steam extraction and heat supply mode of operation, the rotating diaphragm 400 of the steam turbine is partially opened and adjusted according to the following three conditions:
in the first case, when the medium-pressure steam output by the waste heat boiler is larger than the steam extraction amount, the medium-pressure steam part goes to a steam supply network, and the surplus steam enters a steam turbine to do work for power generation;
in the second case, when the medium-pressure steam output by the waste heat boiler is equal to the steam extraction amount, the medium-pressure steam is totally sent to a steam supply network;
And thirdly, when the medium-pressure steam output by the waste heat boiler is smaller than the steam extraction amount, the medium-pressure steam is totally sent to the steam supply network, and meanwhile, the additional steam is extracted from the rotating partition plate of the steam turbine and mixed with the rotating partition plate to be sent to the steam supply network.
Preferably, the adjusting unit provided before the high-pressure steam source reaches the turbine includes a high-pressure main steam valve 101 and a high-pressure adjusting valve 102, and the high-pressure steam output from the waste heat boiler flows into the front of the turbine sequentially through the high-pressure main steam valve 101 and the high-pressure adjusting valve 102.
Preferably, the regulating unit arranged before the medium-pressure steam source reaches the rotating partition 400 of the steam turbine comprises a first check valve 201, a medium-pressure steam supplementing main steam valve 202, a medium-pressure steam supplementing regulating valve 203, a second check valve 204, a steam extraction quantity regulating valve 205 and an electric stop valve 206, the medium-pressure steam output by the waste heat boiler is divided into two paths after sequentially passing through the first check valve 201, the medium-pressure steam supplementing main steam valve 202 and the medium-pressure steam supplementing regulating valve 203 to the node B, one path flows into the middle part of the steam turbine before rotating the partition 400 and is converged with main stream steam in the steam turbine to continuously apply work, and the other path sequentially passes through the second check valve 204, the steam extraction quantity regulating valve 205 and the electric stop valve 206 to go to a steam supply network.
Preferably, when the system is in pure condensation operation, the extraction volume regulating valve 205 is closed; when the system is operating in the steam extraction heating mode, the steam extraction regulating valve 205 is opened.
Preferably, the adjusting unit arranged before the low-pressure steam source reaches the steam turbine comprises a low-pressure steam supplementing main valve 301 and a low-pressure steam supplementing adjusting valve 302, and the low-pressure steam sequentially flows into the middle and rear part of the steam turbine through the low-pressure steam supplementing main valve 301 and the low-pressure steam supplementing adjusting valve 302 for secondary steam supplementing.
The invention has the advantages that: the traditional E-cascade circulating steam system is usually a double-pressure system, and if the steam extraction amount is large, the whole system operation fluctuation can be caused on the steam turbine. Compared with the traditional technology, the invention has the advantages that: the steam system is set into a three-pressure system, wherein a primary medium-pressure steam supplementing steam source is arranged as a main steam source for supplying steam, the flow direction of the steam is controlled through the switch of the regulating valve and the check valve, and the rotary partition plate of the steam turbine and the steam extraction system are used for co-ordinated work to receive the medium-pressure steam quantity supplied by the waste heat boiler or supplement the steam quantity of the medium-pressure steam supplying insufficient part of the waste heat boiler.
The technology can enhance the steam supply capacity of the combined cycle unit, the larger steam supply amount is not limited by the operation of the steam turbine, the flexible adjustment can be realized, and the quality of steam supply is ensured. The energy source of the combined cycle unit is clean fossil energy such as natural gas, and the technology can expand the application range of the combined cycle unit, is beneficial to playing the role of equipment to the greatest extent, and is beneficial to the economic benefit and the social benefit of power plant owners. Meanwhile, the system makes the heating surface of the waste heat boiler modularized, which is beneficial to reducing the manufacturing cost of the waste heat boiler.
Drawings
FIG. 1 is a schematic diagram of a combined cycle steam extraction and compensation system for increasing the steam supply adjustment range according to the present invention.
Detailed Description
The first embodiment is as follows: next, referring to fig. 1, a combined cycle steam extraction and compensation system for increasing a steam supply adjustment range according to the present embodiment is described, where the system includes three pressure level steam sources and an adjustment unit;
The waste heat boiler outputs three pressure grade steam sources of high pressure steam, medium pressure steam and low pressure steam, wherein the high pressure steam is used as a main power steam source of the steam turbine; the medium-pressure steam source is used as a steam source of a forward steam supply network and a primary steam supplementing steam source of the steam turbine at the same time; the low-pressure steam source is used as a secondary steam supplementing steam source of the steam turbine, the regulating units are arranged before the three steam sources reach the steam turbine, and the system steam supply regulating process is as follows:
when the system is in pure condensation operation, the rotary partition 400 of the steam turbine is fully opened, and medium-pressure steam output by the waste heat boiler is fully used as a primary steam supplementing source to enter the steam turbine for power generation;
When the system is in the steam extraction and heat supply mode of operation, the rotating diaphragm 400 of the steam turbine is partially opened and adjusted according to the following three conditions:
in the first case, when the medium-pressure steam output by the waste heat boiler is larger than the steam extraction amount, the medium-pressure steam part goes to a steam supply network, and the surplus steam enters a steam turbine to do work for power generation;
in the second case, when the medium-pressure steam output by the waste heat boiler is equal to the steam extraction amount, the medium-pressure steam is totally sent to a steam supply network;
And thirdly, when the medium-pressure steam output by the waste heat boiler is smaller than the steam extraction amount, the medium-pressure steam is totally sent to the steam supply network, and meanwhile, the additional steam is extracted from the rotating partition plate of the steam turbine and mixed with the rotating partition plate to be sent to the steam supply network.
The regulating unit arranged before the high-pressure steam source reaches the steam turbine comprises a high-pressure main steam valve 101 and a high-pressure regulating valve 102, and the high-pressure steam output by the waste heat boiler flows into the front part of the steam turbine through the high-pressure main steam valve 101 and the high-pressure regulating valve 102 in sequence.
The regulating unit arranged before the low-pressure steam source reaches the steam turbine comprises a low-pressure steam supplementing main valve 301 and a low-pressure steam supplementing regulating valve 302, and low-pressure steam sequentially flows into the middle and rear parts of the steam turbine through the low-pressure steam supplementing main valve 301 and the low-pressure steam supplementing regulating valve 302 for secondary steam supplementing.
The regulating unit arranged before the medium-pressure steam source reaches the rotating partition 400 of the steam turbine comprises a first check valve 201, a medium-pressure steam supplementing main steam valve 202, a medium-pressure steam supplementing regulating valve 203, a second check valve 204, a steam extraction quantity regulating valve 205 and an electric stop valve 206, wherein medium-pressure steam output by the waste heat boiler sequentially passes through the first check valve 201, the medium-pressure steam supplementing main steam valve 202 and the medium-pressure steam supplementing regulating valve 203 to the node B and is divided into two paths, one path flows into the middle of the steam turbine before the rotating partition 400 and is converged with main stream steam in the steam turbine to continuously apply work, and the other path sequentially passes through the second check valve 204, the steam extraction quantity regulating valve 205 and the electric stop valve 206 and is sent to a steam supply network. The rotating partition plate of the steam turbine can absorb and supplement steam and extract steam outwards. Realizing the free adjustment of steam extraction and steam supplement.
Examples: the system mainly comprises waste heat boilers with three pressure levels, a steam turbine capable of extracting and supplementing steam in front of the same rotary partition 400, a pipeline and a valve set for adjusting the flow direction of steam according to the steam supply requirement, and the like.
The medium-pressure steam supplementing pipeline is divided into three sections A-B-C-D for explanation. Wherein the pipeline from the medium-pressure steam source to the pipeline branch point is an A-B section; the pipeline from the branch point to the front of the rotating partition board of the steam turbine is a B-C section; the pipeline from the branch point to the steam supply network is a B-D section.
The adjusting method comprises the following steps:
(1) When the steam turbine is in the pure condensation working condition, the steam extraction quantity adjusting valve 205 is closed, the rotary partition 400 is adjusted to be in a full-open state, the medium-pressure steam supplementing enters the steam turbine from the A-B-C pipeline to push the steam turbine to apply work, and no steam flows in the B-D pipeline;
(2) When the steam turbine is in the steam extraction working condition operation, the steam extraction quantity regulating valve 205 is opened and plays a role in controlling the steam extraction quantity; the rotating barrier 400 is suitably closed to control the vapor pressure in front of the rotating barrier, i.e., the vapor supply pressure. The steam supply is provided by the exhaust-heat boiler and the steam turbine in a matched manner according to the steam demand (B-D section steam flow).
When the steam supply demand is smaller than Gt/h, all steam supply is provided by the medium-pressure steam supply, and residual steam flows into the steam turbine to apply work, wherein part of the medium-pressure steam flows from A to B, and part of the medium-pressure steam flows from B to D, and the rest of the steam flows from B to C and enters the steam turbine;
When the steam supply demand is equal to Gt/h, the medium-pressure steam supplement is used for supplying steam to a steam supply network, the flow direction of the steam is A-B-D, and no steam flows in the B-C section pipeline;
when the steam supply demand is greater than Gt/h, the rotary partition 400 is continuously turned off, partial steam is extracted from the main stream of the steam turbine for steam supply besides medium-pressure steam supply, the medium-pressure steam supply is used as all external steam supply to directly go to a steam supply network, the steam flow direction is A-B-D, and meanwhile, the B-C section pipeline is provided with steam extracted from the steam turbine, flows from the point C to the point B, and flows to the point D together after being mixed with the steam from the point A-B.
The efficient cascade utilization of the energy of the gas-steam combined cycle cogeneration system is fully realized, the steam supply capacity and the regulating capacity of the combined cycle device are enhanced, the stability of the system after heat supply and steam extraction is improved, the impact of the heat supply and steam extraction on the system is reduced, and meanwhile, the modularization of the heating surface of the waste heat boiler is realized, and the manufacturing cost and the heat supply operation cost of power plant equipment are reduced.
Claims (1)
1. A combined cycle steam extraction and supplement system for increasing a steam supply adjusting range is characterized by comprising three pressure grade steam sources and an adjusting unit;
The waste heat boiler outputs three pressure grade steam sources of high pressure steam, medium pressure steam and low pressure steam, wherein the high pressure steam is used as a main power steam source of the steam turbine; the medium-pressure steam source is used as a steam source of a forward steam supply network and a primary steam supplementing steam source of the steam turbine at the same time; the low-pressure steam source is used as a secondary steam supplementing steam source of the steam turbine, the regulating units are arranged before the three steam sources reach the steam turbine, and the system steam supply regulating process is as follows:
When the system is in pure condensation operation, the rotary partition plate (400) of the steam turbine is fully opened, and medium-pressure steam output by the waste heat boiler is fully used as a primary steam supplementing source to enter the steam turbine for power generation;
when the system is in a steam extraction and heat supply mode of operation, the rotary partition plate (400) of the steam turbine is partially opened and is respectively adjusted according to the following three conditions:
in the first case, when the medium-pressure steam output by the waste heat boiler is larger than the steam extraction amount, the medium-pressure steam part goes to a steam supply network, and the surplus steam enters a steam turbine to do work for power generation;
in the second case, when the medium-pressure steam output by the waste heat boiler is equal to the steam extraction amount, the medium-pressure steam is totally sent to a steam supply network;
Thirdly, when the medium-pressure steam output by the waste heat boiler is smaller than the steam extraction amount, the medium-pressure steam is totally sent to a steam supply network, and additional steam is extracted from a rotating partition plate of the steam turbine and mixed with the rotating partition plate to be sent to the steam supply network;
The regulating unit arranged before the high-pressure steam source reaches the steam turbine comprises a high-pressure main steam valve (101) and a high-pressure regulating valve (102), and high-pressure steam output by the waste heat boiler flows into the front part of the steam turbine through the high-pressure main steam valve (101) and the high-pressure regulating valve (102) in sequence;
The regulating unit arranged before the medium-pressure steam source reaches the rotating partition plate (400) of the steam turbine comprises a first check valve (201), a medium-pressure steam supplementing main steam valve (202), a medium-pressure steam supplementing regulating valve (203), a second check valve (204), a steam extraction regulating valve (205) and an electric stop valve (206), wherein medium-pressure steam output by the waste heat boiler sequentially passes through the first check valve (201), the medium-pressure steam supplementing main steam valve (202) and the medium-pressure steam supplementing regulating valve (203) to a node B and is divided into two paths, one path flows into the middle part of the steam turbine before the rotating partition plate (400) and is converged with main steam in the steam turbine to continue acting, and the other path sequentially passes through the second check valve (204), the steam extraction regulating valve (205) and the electric stop valve (206) to go to a steam supply network;
When the system is in pure condensation operation, the steam extraction quantity regulating valve (205) is closed; when the system is in a steam extraction and heat supply mode operation, a steam extraction quantity regulating valve (205) is opened;
The regulating unit arranged before the low-pressure steam source reaches the steam turbine comprises a low-pressure steam supplementing main valve (301) and a low-pressure steam supplementing regulating valve (302), and low-pressure steam sequentially flows into the middle and rear part of the steam turbine through the low-pressure steam supplementing main valve (301) and the low-pressure steam supplementing regulating valve (302) to supplement steam secondarily.
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| CN202010734717.4A CN111734503B (en) | 2020-07-27 | 2020-07-27 | Combined cycle steam extraction and supplement system for increasing steam supply adjusting range |
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| CN202010734717.4A CN111734503B (en) | 2020-07-27 | 2020-07-27 | Combined cycle steam extraction and supplement system for increasing steam supply adjusting range |
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| CN111734503B true CN111734503B (en) | 2024-05-17 |
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| CN205261515U (en) * | 2015-12-31 | 2016-05-25 | 神华集团有限责任公司 | Boiler system |
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| CN212318097U (en) * | 2020-07-27 | 2021-01-08 | 哈尔滨汽轮机厂有限责任公司 | Combined cycle steam extraction and steam supplementation system for increasing steam supply regulation range |
-
2020
- 2020-07-27 CN CN202010734717.4A patent/CN111734503B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS6260906A (en) * | 1985-09-10 | 1987-03-17 | Fuji Electric Co Ltd | Control system for extracted steam and exhaust pressure of steam supply and power generation facility |
| JPH03115707A (en) * | 1989-09-28 | 1991-05-16 | Hitachi Ltd | Combined power plant |
| CN102392700A (en) * | 2011-08-23 | 2012-03-28 | 福建省石狮热电有限责任公司 | Novel backpressure turbine with low vacuum regenerative heat |
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