CN212457058U - Heat supply parameter lifting system based on power plant deep peak regulation - Google Patents
Heat supply parameter lifting system based on power plant deep peak regulation Download PDFInfo
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Abstract
The utility model relates to a heat supply parameter lift system based on under power plant's degree of depth peak shaving, include: the system comprises a steam turbine high-pressure cylinder, a generator, an isolation valve A, a motor, a steam compressor, an isolation valve B and an isolation valve C; the high-pressure cylinder of the steam turbine is connected with a generator; the outlet of the turbine high pressure cylinder is divided into two paths: one path is connected to a hot user through a steam pipeline, and an isolation valve B is arranged on the steam pipeline between the high-pressure cylinder of the steam turbine and the hot user; the other path is connected with the inlet of a steam compressor through a steam pipeline, and an isolating valve A is arranged on the steam pipeline between the steam compressor and the high-pressure cylinder of the steam turbine. The utility model has the advantages that: the system can improve the parameters of heat supply steam, and ensure that the thermal power generating unit can still meet the heat supply requirement when in deep peak shaving operation; the system can reduce energy loss, improve the energy utilization rate and improve the economy; the system can also increase the heat supply distance of the unit and meet the requirement of long-distance heat supply.
Description
Technical Field
The utility model relates to an energy field provides a heat supply parameter lift system based on under the degree of depth peak shaving of power plant, guarantees that thermal power generating unit still can satisfy the heat supply demand when being in degree of depth peak shaving operation, can reduce energy loss simultaneously, improves energy utilization.
Background
With the rapid development of electric power construction and the trend of the supply and demand relationship to balance, the thermal power generating units in China generally face the situation that the number of utilization hours is reduced and the units are frequently in deep peak shaving operation. If the thermal power generating unit participates in peak regulation and needs heat supply at the same time, the reliability of heat supply is particularly important. Generally, high-pressure cylinder exhaust steam is used for medium-pressure heating steam, and when a thermal power generating unit is in deep peak regulation operation, heating parameters often cannot reach design values, and measures need to be taken to improve the heating parameters so as to meet user requirements. The following two common measures are currently used:
1) and reducing the temperature and the pressure of the main steam to heat supply parameters. Because the main steam is steam which does not enter the high-pressure cylinder to do work, the steam quality is higher, a large amount of energy loss is caused by direct temperature and pressure reduction, and the economical efficiency is not high.
2) The steam exhaust parameters of the high-pressure cylinder are improved by reducing the opening degree of the steam regulating valve in front of the high-pressure cylinder so as to meet the heat supply parameters. However, the reduction of the steam damper results in throttling losses, which inevitably leads to a reduction in the economy.
In conclusion, the existing measures mainly have the defects of low energy utilization rate, poor energy-saving effect, low economy and the like.
SUMMERY OF THE UTILITY MODEL
The utility model aims at overcoming not enough among the prior art, providing a heat supply parameter lift system based on under the degree of depth peak shaving of power plant.
This kind of heating parameter lift system based on under power plant's degree of depth peak regulation includes: the system comprises a steam turbine high-pressure cylinder, a generator, an isolation valve A, a motor, a steam compressor, an isolation valve B and an isolation valve C; the high-pressure cylinder of the steam turbine is connected with a generator; the outlet of the turbine high pressure cylinder is divided into two paths: one path is connected to a hot user through a steam pipeline, and an isolation valve B is arranged on the steam pipeline between the high-pressure cylinder of the steam turbine and the hot user; the other path is connected with the inlet of a steam compressor through a steam pipeline, and an isolating valve A is arranged on the steam pipeline between the steam compressor and the high-pressure cylinder of the steam turbine; the outlet of the vapor compressor is connected with a hot user, and an isolation valve C is arranged on a vapor pipeline connecting the vapor compressor and the hot user; the vapor compressor is connected with a motor.
Preferably, the high-pressure cylinder of the steam turbine is connected with a generator through a coupler, and the generator is connected into a circuit; the steam compressor is connected with the motor through a coupling.
Preferably, the steam pipeline is made of an alloy material resistant to high temperature and high pressure.
The utility model has the advantages that: the system can improve the parameters of heat supply steam, and ensure that the thermal power generating unit can still meet the heat supply requirement when in deep peak shaving operation; the system can reduce energy loss, improve the energy utilization rate and improve the economy; the system can also increase the heat supply distance of the unit and meet the requirement of long-distance heat supply.
Drawings
FIG. 1 is a schematic diagram of a heating parameter boost system based on deep peak shaving of a power plant.
Description of reference numerals: the system comprises a high-pressure turbine cylinder 1, a generator 2, an isolation valve A3, a motor 4, a steam compressor 5, an isolation valve B6 and an isolation valve C7.
Detailed Description
The present invention will be further described with reference to the following examples. The following description of the embodiments is merely provided to aid in understanding the invention. It should be noted that, for those skilled in the art, the present invention can be modified in several ways without departing from the principle of the present invention, and these modifications and modifications also fall into the protection scope of the claims of the present invention.
At present, the following two measures are taken for improving the parameters of the heat supply steam during deep peak regulation operation of the thermal power generating unit:
1) and reducing the temperature and the pressure of the main steam to heat supply parameters. Because the main steam is steam which does not enter the high-pressure cylinder to do work, the steam quality is higher, a large amount of energy loss is caused by direct temperature and pressure reduction, and the economical efficiency is not high.
2) The steam exhaust parameters of the high-pressure cylinder are improved by reducing the opening degree of the steam regulating valve in front of the high-pressure cylinder so as to meet the heat supply parameters. However, the reduction of the steam damper results in throttling losses, which inevitably leads to a reduction in the economy.
The utility model discloses a heat supply parameter lift system based on under power plant's degree of depth peak regulation, when steam compressor 5 moved, isolation valve B6 closed, and the steam flow direction was steam turbine high pressure cylinder 1- > isolation valve A3- > steam compressor 5- > isolation valve C7; when the steam compressor 5 is not needed to be used or the steam compressor 5 is overhauled and maintained, the isolation valve A3 is closed, and steam flows to the high-pressure cylinder 1- > isolation valve B6- > heat user of the steam turbine.
The utility model can improve the reliability of heat supply parameters, and can still meet the heat supply requirement when the thermal power generating unit is in deep peak shaving operation; when the thermal power generating unit is in deep peak regulation operation and the heat supply parameters do not meet the requirements of users, the steam parameters are improved through the steam compressor. Compared with the original conventional method, the method for reducing the temperature and the pressure of the main steam and the method for reducing the steam regulating valve, when the parameters of the heat supply steam are improved, the process of the original thermal power generating unit is not required to be modified, the high-quality steam is not directly reduced in temperature and pressure, and the energy loss is reduced. The energy utilization rate is improved, and the economical efficiency is improved. The heat supply distance of the unit can be increased, the requirement of long-distance heat supply is met, initial heat supply parameters can be increased at the heat supply source, and pressure loss caused by long-distance heat supply is compensated.
Example 1:
the heat supply parameter lifting system configuration based on the power plant deep peak regulation is as follows: when the thermal power generating unit is in deep peak shaving operation, when the steam discharge parameter of the steam turbine high-pressure cylinder 1 is lower than the requirement of a user, the motor 4 is started to drive the steam compressor 5, meanwhile, the isolation valve B6 directly connected to a heat user is closed, and the isolation valve A3 in front of the steam compressor 5 and the isolation valve C7 behind the steam compressor 5 are opened. The steam compressor 5 is connected with the motor 4 through a coupler, and the motor 4 drives the steam compressor 5 to rotate after rotating; the steam compressor 5 is used for compressing the exhausted steam of the high-pressure cylinder 1 of the steam turbine, so that the parameters of the high-pressure cylinder are improved, and the requirements of users are met.
Example 2:
a350 MW subcritical, middle single reheating, three-cylinder two-steam-exhaust and condensing thermal power unit has a main steam pressure of 17.75MPa, a temperature of 540 ℃, a high-pressure cylinder steam-exhaust pressure of 4.05MPa and a temperature of 538 ℃. The three cylinders are a high-pressure cylinder, an intermediate-pressure cylinder and a low-pressure cylinder. The two steam exhaust ports of the low-pressure cylinder are two. The intermediate reheating refers to that the steam which is expanded and does work in the high-pressure cylinder of the steam turbine is sent to a reheater of the boiler to be reheated, so that the steam is superheated to be close to or equal to the temperature of the main steam, and then the steam is sent back to the intermediate pressure cylinder or the low pressure cylinder of the steam turbine to continue to expand and do work. The high-pressure cylinder steam exhaust pipeline is used for punching, steam extraction and heat supply, the pressure required by a heat user is not lower than 1.4MPa, and the heat supply steam flow is 120 t/h.
When the load of the unit is 220MW, the pressure of punching, steam extraction and heat supply through the high-pressure cylinder steam exhaust pipeline just meets the pressure required by a heat user. When the load of the unit is 180MW and the steam extraction flow is 120t/h, the exhaust pressure of the high-pressure cylinder is only 1.1 MPa. If the traditional methods of reducing the temperature and the pressure of main steam to 1.4MPa or reducing a steam regulating valve to increase the exhaust pressure of a high-pressure cylinder to 1.4MPa are adopted, energy waste is caused, the running efficiency of a unit is reduced, and the economical efficiency is reduced.
If the system is used, a 2MW steam compressor driven by a motor is needed to be configured, and the exhaust pressure of the high-pressure cylinder is increased to 1.4MPa through the steam compressor. The unit does not need to be adjusted, the efficiency of the unit cannot be reduced, the reliability and the economical efficiency of heat supply are effectively improved, and the energy utilization rate is effectively improved.
Claims (3)
1. Heating parameter lift system based on under power plant's degree of depth peak shaver, its characterized in that includes: the system comprises a steam turbine high-pressure cylinder (1), a generator (2), an isolation valve A (3), a motor (4), a steam compressor (5), an isolation valve B (6) and an isolation valve C (7); the steam turbine high-pressure cylinder (1) is connected with a generator (2); the outlet of the steam turbine high-pressure cylinder (1) is divided into two paths: one path is connected to a hot user through a steam pipeline, and an isolation valve B (6) is arranged on the steam pipeline between the high-pressure cylinder (1) of the steam turbine and the hot user; the other path is connected with the inlet of a steam compressor (5) through a steam pipeline, and an isolating valve A (3) is arranged on the steam pipeline between the steam compressor (5) and the high-pressure cylinder (1) of the steam turbine; the outlet of the vapor compressor (5) is connected with a hot user, and a vapor pipeline connecting the vapor compressor (5) and the hot user is provided with an isolation valve C (7); the steam compressor (5) is connected with a motor.
2. The heating parameter improvement system based on power plant deep peak shaving according to claim 1, characterized in that: the high-pressure cylinder (1) of the steam turbine is connected with the generator (2) through a coupler, and the generator (2) is connected into a circuit; the steam compressor (5) is connected with the motor (4) through a coupling.
3. The heating parameter improvement system based on power plant deep peak shaving according to claim 1, characterized in that: the steam pipeline is made of high-temperature and high-pressure resistant alloy materials.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021239398.1U CN212457058U (en) | 2020-06-30 | 2020-06-30 | Heat supply parameter lifting system based on power plant deep peak regulation |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114412748A (en) * | 2021-09-15 | 2022-04-29 | 杭州中能汽轮动力有限公司 | Compressor unit, system and control method matched with polyester engineering in chemical fiber industry |
| CN115936450A (en) * | 2023-03-15 | 2023-04-07 | 南京华助智能科技有限公司 | Loss diagnosis method and system for steam heating system pipeline |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114412748A (en) * | 2021-09-15 | 2022-04-29 | 杭州中能汽轮动力有限公司 | Compressor unit, system and control method matched with polyester engineering in chemical fiber industry |
| CN115936450A (en) * | 2023-03-15 | 2023-04-07 | 南京华助智能科技有限公司 | Loss diagnosis method and system for steam heating system pipeline |
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