CN-224201690-U - Deep peak regulation system configuration for adaptive operation of coal motor group

CN224201690UCN 224201690 UCN224201690 UCN 224201690UCN-224201690-U

Abstract

The utility model provides a deep peak regulation system configuration for adaptive operation of a coal motor unit, wherein a new external steam cooler is additionally arranged at a water supply outlet of an existing final-stage high-pressure heater on a water supply pipeline, a steam side inlet of the new 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 pressurizing module, a steam side outlet of the new external steam cooler is communicated with a steam inlet of the existing final-stage high-pressure heater, namely, the water supply is heated twice in the new external steam cooler and the existing final-stage high-pressure heater respectively so as to improve the temperature of the water supply of the unit when the water is fed into a furnace, and meanwhile, a certain water supply pressure is maintained to keep a certain supercooling degree of the water supply at an outlet of the coal economizer, so that a denitration system of the unit under a deep peak regulation working condition is continuously and stably put into operation, the energy consumption of the unit is prevented from being greatly increased, and the running economy of the unit is effectively improved.

Inventors

ZHANG LING
DU YANGYANG
ZHANG WEI
ZHANG CHENG
LU CHAO
TANG HUA
Han Ruoyuan
GU XIAODONG

Assignees

上海外高桥第三发电有限责任公司

Dates

Publication Date: 20260505
Application Date: 20250307

Claims (9)

1. A deep peak regulation system configuration for adaptive operation of a coal motor group is characterized in that 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 fed to the header through the descending pipe and then heated by the water cooling wall, the high-pressure drum adopts a full-cycle steam inlet mode without a regulation stage, the deoxygenation system, the existing final-stage high-pressure heater, a newly-added external steam cooler are sequentially arranged in the water supply pipeline, a water supply outlet of the newly-added external steam cooler is connected with a boiler water supply inlet, the steam pipeline comprises a main steam pipeline connected between a steam outlet of the boiler and a steam inlet of the high-pressure drum and a steam extraction pipeline connected between the steam outlet of the high-pressure drum and an inlet of the existing final-stage high-pressure heater, a main steam extraction pipeline is arranged, an external steam extraction pipeline is connected with an external steam extraction valve, and the steam extraction pipeline is arranged on the main steam pipeline, the external steam pipeline is connected with a new-stage high-pressure steam heater, and the steam pump is connected with a new-stage high-pressure heater, and the steam motor is connected with a new-stage high-pressure heater.
2. The depth peaking system configuration of claim 1, wherein a vapor compressor is disposed in the conduit of the boost module, the vapor compressor being configured to boost the vapor entering the boost module below the target extraction pressure level such that the vapor below the target extraction pressure level is pressurized by the vapor compressor at a pressure higher than the pressure of the last extraction of the high pressure cylinder.
3. The depth peaking system configuration of claim 2, wherein when the steam side outlet steam of the newly added external steam cooler enters the existing final-stage high-stage heating feedwater, the steam extraction isolation valve on the steam extraction pipeline is in a closed state, and the steam pressure of the steam side outlet of the newly-added external steam cooler is higher than the final steam extraction pressure of the high-pressure cylinder.
4. A depth peaking system configuration according to claim 3, wherein a newly added extraction isolation valve is provided in the conduit of the boost module, the newly added extraction isolation valve being located upstream of the vapor compressor.
5. The depth peaking system configuration of claim 4, wherein a circulation pump is provided in a downcomer connected between a drum and a header within the boiler; And/or a heat exchanger is further arranged in the pipeline of the pressurizing module, and the heat exchanger is positioned at the upstream of the vapor compressor or between the vapor compressor and the newly-added external vapor cooler.
6. The depth peaking system configuration of claim 4, wherein the steam below the target extraction pressure level originates from a last stage extraction of the high pressure cylinder, an inlet of the boost module is coupled 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 depth peaking system configuration of claim 4, wherein the source of steam below the target extraction pressure level is either a recuperative extraction or reheat system steam or a superheater system steam in the present or other units.
8. The depth peaking system configuration of claim 1, wherein the main steam throttle component is a high pressure cylinder admission valve group or a regulator valve.
9. A depth peaking system arrangement according to any one of claims 1-8, wherein a throttling assembly is provided in the feed water or steam line from the economizer outlet to the high pressure cylinder inlet.

Description

Deep peak regulation system configuration for adaptive operation of coal motor group Technical Field The utility model relates to the technical field of power generation, in particular to a depth peak regulation system configuration for adaptive operation of a coal motor group. Background Belongs to the technical field of power generation, in particular to a deep peak regulation system configuration for adaptive operation of a unit. 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. In recent years, the installed capacity and the generated energy of new energy are newly created to be high, but because the generated energy of the new energy generation mode has uncertainty of the generated energy, the traditional thermal power generating unit, especially the coal-fired thermal power generating unit, still has to take the roles of basic guarantee power supply and flexible peak regulation power supply matched with the new energy for generating. Taking a certain 300MW subcritical unit as an example, a full-cycle steam inlet mode is adopted for a high-pressure cylinder, an adjusting stage is not configured, and the dispatching load range of the regional power grid is 40% -100% THA. However, with the rapid development of new energy, the regional power grid has now informed that the unit needs deep peak shaving operation, and the lower limit of load scheduling needs to be as low as 20%. For a subcritical unit needing to participate in deep peak shaving operation, a high-pressure cylinder adopts a full-cycle steam inlet mode, no regulating stage is arranged, 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 operate 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 200mg/Nm 3 or higher, 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 solve the technical problem of how to maintain the continuous and stable operation of a denitration system under the deep peak regulation working condition of a subcritical unit, avoid the defects of great increase of unit energy consumption and great reduction of operation economy, and provide the deep peak regulation system configuration for the adaptive operation of the coal motor unit. The utility model solves the technical problems by the following technical scheme: The utility model provides a deep peak regulation system configuration for adaptive operation of a coal motor group, which comprises a boiler, an oxygen removal 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 by the water cooling wall and then returns to the steam drum after passing through the descending pipe to the header, the high-pressure cylinder adopts a full-cycle steam inlet mode without a regulation stage, the oxygen removal system, the existing final-stage high-pressure heater, a newly-added external steam cooler are sequentially arranged in the water supply pipeline, a water supply outlet of the newly-added external steam cooler is connected with a water supply inlet of the boiler, 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, a steam extraction pipeline connected between the steam inlet of the high-pressure cylinder and an inlet of the existing final-stage high-pressure heater, the main steam pipeline is ar