CN215520990U - Cylinder cutting heating system after through-flow modification of 500MW thermal power generating unit - Google Patents
Cylinder cutting heating system after through-flow modification of 500MW thermal power generating unit Download PDFInfo
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- CN215520990U CN215520990U CN202122152280.6U CN202122152280U CN215520990U CN 215520990 U CN215520990 U CN 215520990U CN 202122152280 U CN202122152280 U CN 202122152280U CN 215520990 U CN215520990 U CN 215520990U
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 15
- 230000004048 modification Effects 0.000 title description 3
- 238000012986 modification Methods 0.000 title description 3
- 230000009466 transformation Effects 0.000 claims abstract description 14
- 230000001105 regulatory effect Effects 0.000 claims abstract description 5
- 239000002699 waste material Substances 0.000 abstract description 2
- 238000005259 measurement Methods 0.000 abstract 2
- 238000001816 cooling Methods 0.000 description 8
- 238000010248 power generation Methods 0.000 description 8
- 239000003245 coal Substances 0.000 description 6
- 238000000605 extraction Methods 0.000 description 5
- 230000006872 improvement Effects 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000010727 cylinder oil Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
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Abstract
500MW火电机组通流改造后的切缸供热系统。现有技术俄制500MW机组汽轮机热耗远高于同类型，拆除后新建机组，投资费用大，服役期未满的设备提前退役，造成巨大浪费。本实用新型其组成包括：2个低压缸（1），2个低压缸平行布置，其两侧的联通管上分别安装有液控蝶阀（9），联通管下方通过异形管与电动调节阀（2）连接，电动调节阀与流量测量装置（3）连接，流量测量装置分成2路，一路通过补偿器A（4）分别与排汽管（8）、气动止回阀（5）连接，另一路通过法兰与所述的联通管连接，气动止回阀通过管路与液压快关阀（6）连接，液压快关阀分别与电动蝶阀（7）、2个截止阀（11）连接。本实用新型用于500MW火电机组通流改造后的切缸供热系统。
The cut-cylinder heating system of the 500MW thermal power unit after the through-flow transformation. The heat consumption of the existing Russian-made 500MW unit steam turbine is much higher than that of the same type. After dismantling the new unit, the investment cost is large, and the equipment before the service period is retired early, resulting in huge waste. The utility model comprises: two low-pressure cylinders (1), two low-pressure cylinders are arranged in parallel, hydraulic control butterfly valves (9) are respectively installed on the communication pipes on both sides of the communication pipes, and a special-shaped pipe and an electric regulating valve (9) are connected under the communication pipes. 2) Connection, the electric regulating valve is connected with the flow measurement device (3), the flow measurement device is divided into two channels, one is connected to the exhaust pipe (8) and the pneumatic check valve (5) through the compensator A (4) respectively, and the other One way through the flange is connected with the connecting pipe, the pneumatic check valve is connected with the hydraulic quick-closing valve (6) through the pipeline, and the hydraulic quick-closing valve is respectively connected with the electric butterfly valve (7) and two stop valves (11). The utility model is used for the cut-cylinder heating system after the 500MW thermal power unit is reformed through flow.
Description
Technical Field
The utility model relates to the technical field of thermal power generation, in particular to a cylinder cutting heat supply system after through-flow transformation of a 500MW thermal power generating unit.
Background
Along with the obvious promotion of urban construction speed and green development quality, the coal consumption and heat consumption rate of thermal power coal-fired units are relatively high, the heat consumption of a steam turbine of a Russian 500MW unit in the prior art reaches 8122kJ/kWh and is far higher than the heat consumption level of the heat consumption 7100kJ/kWh of a steam turbine of a domestic 600MW unit at the present stage, the coal consumption of the power generation of the whole Russian unit is 335g/kWh and is also far higher than the coal consumption of the power generation of 310g/kWh of the domestic same type unit, the problem can be solved by newly building the Russian unit after the Russian unit is removed, but the investment cost is high, and a lot of equipment which is not in service is retired in advance, so that huge waste is caused. Meanwhile, with the increase of the peak regulation requirement of the depth of the power grid and the improvement of the peak regulation requirement, the increase of the heat supply requirement is increased year by year and other comprehensive requirements, energy conservation and emission reduction are carried out, and the efficiency of the steam turbine is inevitably improved.
Disclosure of Invention
The utility model aims to provide a cylinder cutting heating system of a 500MW thermal power generating unit after through-flow transformation, which can effectively improve the efficiency of the unit, reduce the coal consumption of the unit for power generation and improve the deep peak regulation capacity and the heating capacity of the unit.
The above purpose is realized by the following technical scheme:
the utility model provides a 500MW thermal power generating unit through-flow is reformed transform and is cut jar heating system, its constitution includes: 2 low-pressure cylinder parallel arrangement, install the liquid accuse butterfly valve on the closed tube of its both sides respectively, closed tube below be connected with electrical control valve through the special pipe, electrical control valve be connected with flow measuring device, flow measuring device divide into 2 ways, one way pass through compensator A respectively with steam extraction pipe, pneumatic check valve be connected, another way pass through the flange with closed tube connect, pneumatic check valve pass through the pipeline and be connected with hydraulic pressure fast-closing valve, hydraulic pressure fast-closing valve be connected with electrical butterfly valve, 2 stop valves respectively.
The cylinder cutting heat supply system after the 500MW thermal power generating unit is subjected to through-flow transformation is characterized in that 2 stop valves are connected in series, two ends of each stop valve are connected to pipelines on two sides of an electric butterfly valve respectively, an upper end pipeline is connected with a heat supply network steam supply pipeline through a compensator B, and the upper portion of a communicating pipe is connected with an intermediate pressure cylinder.
Has the advantages that:
1. the cylinder-cutting heating system after the through-flow transformation of the 500MW thermal power generating unit can effectively improve the efficiency of the unit, reduce the coal consumption of the unit for power generation, improve the deep peak regulation capacity and the heating capacity of the unit and save the cost.
2. According to the utility model, the hydraulic control butterfly valves are respectively arranged on the communicating pipes on the two sides of the low-pressure cylinder, so that all steam entering the low-pressure cylinder can be cut off, only a small amount (60 t/h) of cooling steam is introduced, and the hydraulic control butterfly valves are used for taking away blast heat generated by the low-pressure rotor after zero-output transformation of the low-pressure cylinder, so that the flow of the cooling steam of the low-pressure rotor is reduced, and the heat supply capacity of a unit is improved.
3. The utility model respectively adopts the synergistic effect of the electric butterfly valve, the electric regulating valve, the hydraulic control butterfly valve and other components to effectively combine the through-flow modification efficiency improvement of the unit with the cogeneration of the unit, thereby realizing the seamless switching among the energy-saving efficiency improvement, the wide-load peak regulation and the cogeneration of the Russian 500MW thermal power unit and solving the contradiction between the peak regulation and the heat supply of the unit.
4. After the structure of the utility model is improved, the heat supply generator unit has wider heat supply and power generation adjusting modes, the switching mode of the electric load and the heat load of the steam turbine generator unit is comprehensively realized, the steam turbine generator unit can more flexibly meet the requirements of power grid peak regulation and external heat supply, and the energy supply mode conversion of a large-scale thermal generator unit is effectively improved and adapted.
Description of the drawings:
FIG. 1 is a schematic structural diagram of the present invention.
Wherein: 1. low pressure jar, 2, electrical control valve, 3, flow measuring device, 4, compensator A, 5, pneumatic check valve, 6, hydraulic pressure fast valve, 7, electric butterfly valve, 8, steam extraction pipe, 9, liquid accuse butterfly valve, 10, intermediate pressure jar, 11, stop valve, 12, compensator B.
The specific implementation mode is as follows:
example 1:
the utility model provides a 500MW thermal power generating unit through-flow is reformed transform and is cut jar heating system, its constitution includes: 2 low- pressure cylinder 1, 2 low-pressure cylinder parallel arrangement, install liquid accuse butterfly valve 9 on the closed tube of its both sides respectively, closed tube below pass through the special pipe and be connected with electrical control valve 2, electrical control valve be connected with flow measuring device 3, flow measuring device divide into 2 ways, one way pass through compensator A4 and be connected with steam extraction pipe 8, pneumatic check valve 5 respectively, another way pass through the flange with the closed tube connect, pneumatic check valve pass through the pipeline and be connected with hydraulic pressure fast-closing valve 6, hydraulic pressure fast-closing valve be connected with electric butterfly valve 7, 2 stop valves 11 respectively.
Example 2:
according to the cylinder cutting heating system of the 500MW thermal power generating unit after through-flow transformation, 2 stop valves are connected in series, two ends of the stop valves are respectively connected to pipelines on two sides of the electric butterfly valve, an upper end pipeline is connected with a steam supply pipeline of a heat supply network through a compensator B12, and the upper portion of a communicating pipe is connected with the intermediate pressure cylinder 10.
Example 3:
according to embodiment 1 or 2, the cylinder cutting heat supply method of the cylinder cutting heat supply system after the through-flow transformation of the 500MW thermal power generating unit comprises the following steps:
firstly, the shell of the steam turbine is reserved, and the inner cylinder, the partition plate, the rotor and the sliding pin of the inner cylinder of the steam turbine are replaced, so that the new high-pressure cylinder/intermediate-pressure cylinder/low-pressure cylinder stage number of the steam turbine is as follows: 1+10+8 pressure stage/2 × 16 pressure stage/2 × 2 × 5 pressure stage, 71 stages of four cylinders of the steam turbine are shared, and meanwhile, each steam extraction section outside the cylinder of the steam turbine is not changed, and an auxiliary system matched with the steam extraction section is not changed;
the low-pressure cylinder zero-output transformation is carried out on the through-flow transformed 500MW unit through a low-pressure cylinder zero-output treatment technology, all steam admission of the low-pressure cylinder is cut off by adopting a completely sealed hydraulic control butterfly valve, and only 60t/h of cooling steam is introduced for taking away blast heat generated by the operation of a low-pressure rotor after the low-pressure cylinder zero-output transformation, so that the flow of the cooling steam of the low-pressure rotor is reduced;
the steam exhaust pipeline comprises two horizontal steam exhaust pipelines for exhausting steam to the low-pressure cylinder oil from the intermediate pressure cylinder, two steam inlet main pipes of the low-pressure cylinder are respectively provided with a low-pressure cylinder hydraulic control butterfly valve, cooling steam is led out to a steam inlet of the low-pressure cylinder before a new low-pressure cylinder hydraulic control butterfly valve is added for cooling the last-stage blade of the low-pressure cylinder, a heating steam pipeline and a cooling steam pipeline are led out from a front opening of the new low-pressure cylinder hydraulic control butterfly valve, the cooling steam pipeline is led to the rear position of the new low-pressure cylinder hydraulic control butterfly valve, and simultaneously metal wear-resistant layer spraying treatment is carried out on the last-stage blades of the two low-pressure cylinders.
Through cylinder cutting heat supply transformation, steam 916.9 t/h at 0.264 MPa and 195.2 ℃ can be extracted at maximum by the cylinder cutting heat supply after the through-flow transformation of the Russian 500MW unit, at the moment, the power generation load of the Russian unit is 425.5MW, the heat supply load is 653.1MW, the coal consumption of the whole machine is reduced to 150 g/kWh, and the economic benefit is huge;
along with cutting jar heat supply transformation, at the stable circumstances of burning of boiler, the unit can be free switch between electricity generation and cogeneration, and unit power generation load can realize 200MW to 550MW peak shaver operation, and the peak shaver scope has been enlarged to 65% by 40% of russian.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122152280.6U CN215520990U (en) | 2021-09-07 | 2021-09-07 | Cylinder cutting heating system after through-flow modification of 500MW thermal power generating unit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122152280.6U CN215520990U (en) | 2021-09-07 | 2021-09-07 | Cylinder cutting heating system after through-flow modification of 500MW thermal power generating unit |
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| CN215520990U true CN215520990U (en) | 2022-01-14 |
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| CN202122152280.6U Expired - Fee Related CN215520990U (en) | 2021-09-07 | 2021-09-07 | Cylinder cutting heating system after through-flow modification of 500MW thermal power generating unit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113586189A (en) * | 2021-09-07 | 2021-11-02 | 华能伊敏煤电有限责任公司 | Cylinder cutting heat supply system and heat supply method after through-flow modification of 500MW thermal power generating unit |
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2021
- 2021-09-07 CN CN202122152280.6U patent/CN215520990U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113586189A (en) * | 2021-09-07 | 2021-11-02 | 华能伊敏煤电有限责任公司 | Cylinder cutting heat supply system and heat supply method after through-flow modification of 500MW thermal power generating unit |
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Granted publication date: 20220114 |