CN-224215302-U - Deep peak regulation operation system configuration of coal motor group based on water supply supplementary heating

CN224215302UCN 224215302 UCN224215302 UCN 224215302UCN-224215302-U

Abstract

The utility model provides a deep peak-shaving operation system configuration based on water supply supplemental heating, which is characterized in that a newly-increased final-stage high-pressure heater and a newly-increased external steam cooler are additionally arranged in a water supply pipeline, a steam side inlet of the newly-increased external steam cooler is connected with a pressurizing module, steam with the grade lower than a target extraction pressure is introduced into an inlet of the newly-increased final-stage high-pressure heater, a steam side outlet of the newly-increased external steam cooler is communicated with a steam inlet of the newly-increased final-stage high-pressure heater, and on the basis that the existing final-stage high-pressure heater is normally used for heating the water supply, the introduced steam with the grade lower than the target extraction pressure is respectively subjected to twice supplemental heating in the newly-increased external steam cooler and the newly-increased final-stage high-pressure heater after being pressurized by the pressurizing module, so that the water supply temperature of the unit is increased, a certain water supply pressure is maintained, the unit is subjected to denitration stable operation under deep peak-shaving, the energy consumption of the unit is avoided, the working condition is greatly increased, and the running economy of the unit is effectively improved.

Inventors

ZHANG LING
DU YANGYANG
ZHANG WEI
WEI MIN
LU CHAO
TANG HUA
GE SHENGJUN
XIANG WENHUA

Assignees

上海外高桥第三发电有限责任公司

Dates

Publication Date: 20260508
Application Date: 20250307

Claims (9)

1. A configuration of a deep peak regulation operation system based on water supply supplemental heating of a coal motor group comprises a boiler, a deoxidization system, a high-pressure cylinder, an existing final-stage high-pressure heater, a water supply pipeline and a steam pipeline, and is characterized in that the boiler comprises a coal economizer, a steam drum, a superheater, a header, a descending pipe and a water cooling wall, the coal economizer, the steam drum and the superheater are sequentially connected through pipelines, water at the lower part of the steam drum is heated to the header through the descending pipe and then returns to the steam drum through the water cooling wall, the high-pressure cylinder adopts a partial steam inlet mode to configure a regulating stage, the deoxidization system, the existing final-stage high-pressure heater, a newly-added external steam cooler are sequentially arranged in the water supply pipeline along the water supply flowing direction, the steam pipeline comprises a main steam pipeline connected between a steam outlet of the boiler and a steam inlet of the high-pressure cylinder and a steam inlet of the existing final-stage high-pressure heater, a regulating stage steam inlet valve group is arranged on the main steam pipeline, the extraction pipeline is provided with an external steam inlet valve group, the external steam inlet valve group is arranged on the steam pipeline, and the steam inlet of the steam pipeline is connected with the newly-added external steam cooler, and the new-stage high-pressure heater is connected with the new-stage high-pressure steam heater, and the new-stage high-pressure heater is connected with the new-stage high-pressure heater, and the new-stage high-pressure heater.
2. The deep peak shaver operation system configuration according to claim 1, wherein a vapor compressor is provided in the pipe of the pressurizing module, and the vapor compressor is configured to pressurize the vapor entering the pressurizing module at a level lower than the target extraction pressure, so that the pressure of the vapor at a level lower than the target extraction pressure is higher than the pressure of the final extraction of the high-pressure cylinder after the vapor is pressurized by the vapor compressor.
3. The depth peaking operation system configuration of claim 2, wherein a vapor pressure of a vapor side outlet of the newly added external vapor cooler is higher than a final extraction pressure of the high pressure cylinder.
4. The depth peaking operation system configuration of claim 3, wherein a newly added extraction isolation valve is disposed in a pipeline of the boost module, the newly added extraction isolation valve being located at a front end of the vapor compressor.
5. The deep peak shaver operation system configuration according to claim 4, wherein a heat exchanger is further disposed in the conduit of the booster module, the heat exchanger being located upstream of the vapor compressor or between the vapor compressor and the newly added external vapor cooler.
6. The depth peaking operation system configuration of claim 4, wherein the steam below the target extraction pressure level originates from a portion of the last stage extraction of the high pressure cylinder, an inlet of the boost module is connected to the extraction conduit through a conduit, and an interface of the boost module to the extraction conduit is located upstream of the extraction isolation valve.
7. The deep peak shaver operation system configuration according to claim 4, wherein the steam source below the target extraction pressure level is the back-heated extraction steam or the in-reheat system steam or the in-superheater system steam in the present unit or in other units.
8. The deep peak shaver operation system configuration according to claim 1, wherein a circulating pump is provided in a downcomer connected between the drum and the header in the boiler; and/or the number of the valves of the regulating stage admission valve group is four or six.
9. A deep peak shaver operation system according to any one of claims 1 to 8, wherein a throttling assembly is provided in the water or steam line from the outlet of the economizer to the inlet of the high-pressure cylinder.

Description

Deep peak regulation operation system configuration of coal motor group based on water supply supplementary heating Technical Field The utility model relates to the technical field of power generation, in particular to a depth peak shaving operation system configuration of a coal motor group based on water supply supplementary heating. Background At present, super (super) critical units with high parameters, large capacity, high efficiency and low carbon become the main stream of new unit options in thermal power plants. However, for the stock unit, the subcritical unit of 30-60 kilowatts grade is approximately 1000, and the installed capacity is approximately 3.5 hundred million kilowatts. Although the installed capacity and the generated energy of the new energy are newly created and improved, the traditional thermal power generating unit, especially the coal-fired thermal power generating unit, still has the roles of basic guarantee power supply and flexible peak regulation power supply matched with the new energy for power generation because the new energy power generation mode has the uncertainty of the generated energy. Taking a certain 300MW subcritical unit as an example, a partial steam inlet mode is adopted for a high-pressure cylinder, an adjusting stage is configured as an example, and the dispatching load range of the regional power grid is 40% -100% THA. However, with the rapid development of new energy, the unit needs deep peak shaving operation, and the lower limit of load scheduling needs to be as low as 20%. For subcritical units needing to participate in deep peak shaving operation, for example, the load change range is 20% -100% THA, wherein the deep peak shaving load range is 20% -30% THA, even lower, the following problems are faced: (1) Under the deep peak regulation working condition, the outlet smoke temperature of the economizer is lower than the lower temperature limit of normal operation of the denitration catalyst, such as 300 ℃, the denitration system cannot be operated normally, the emission of NO X is predicted to be exploded and is far higher than the standard requirement value, such as the emission index is exploded from 25mg/Nm 3 to more than 200mg/Nm 3, and the emission index is far beyond the standard value of 50mg/Nm 3; (2) The outlet temperature of the boiler drum is greatly reduced, the temperature of main and reheat steam is obviously reduced, and the energy consumption of a unit is greatly increased, so that the operation economy is greatly reduced. Therefore, how to maintain the continuous and stable operation of the denitration system under the deep peak-shaving working condition of the subcritical unit avoids the great increase of the energy consumption of the unit and the great decrease of the operation economy, and becomes a problem to be solved urgently. Disclosure of utility model The utility model aims to overcome the defects that a denitration system cannot normally operate under a deep peak regulation working condition of a subcritical unit, the energy consumption of the unit is greatly increased, and the operation economy is greatly reduced, and provides a deep peak regulation operation system configuration of a coal motor unit based on water supply supplementary heating. The utility model solves the technical problems by the following technical scheme: The utility model provides a configuration of a deep peak regulation operation system based on water supply supplemental heating of a coal motor group, which comprises a boiler, a deoxidization system, a high-pressure cylinder, an existing final-stage high-pressure heater, a water supply pipeline and a steam pipeline, wherein the boiler comprises an economizer, a steam drum, a superheater, a header, a descending pipe and a water cooling wall, the economizer, the steam drum and the superheater are sequentially connected through pipelines, water at the lower part of the steam drum is heated to the header through the descending pipe and then returned to the steam drum through the water cooling wall, the high-pressure cylinder adopts a partial steam inlet mode to configure a regulating stage, the deoxidization system, the existing final-stage high-pressure heater, a newly added final-stage high-pressure heater and a newly added external steam cooler are sequentially arranged in the water supply pipeline along the water supply flow direction, the steam pipeline comprises a main steam pipeline connected between a steam outlet of the boiler and a steam inlet of the high-pressure cylinder and a steam inlet of the existing high-pressure heater, the main pipeline is provided with a regulating stage steam inlet valve group, the extraction pipeline is arranged on the steam pipeline, the extraction pipeline is provided with an external separation valve group, the extraction valve is arranged on the steam pipeline, the extraction pipeline is connected with the newly added external steam cooler, and the steam pipeline is