CN-224229966-U - Operation system configuration of coal motor group based on water supply supplementary heating

CN224229966UCN 224229966 UCN224229966 UCN 224229966UCN-224229966-U

Abstract

The utility model provides a running system configuration of a coal motor group based on water supply supplementary heating, which is characterized in that a newly added final-stage high-pressure heater and a newly added external steam cooler are additionally arranged on a water supply pipeline on the basis of a water supply heating system of an existing boiler, a steam side inlet of the newly added external steam cooler is connected with a pressurizing module, a steam inlet of the newly added final-stage high-pressure heater is connected with a steam inlet of the newly added external steam cooler, the water supply heated by the existing final-stage high-pressure heater is supplementary heated at the newly added external steam cooler and in the newly added final-stage high-pressure heater, so that the temperature of the water supply fed into the boiler of the unit under the deep peak-shaving working condition is improved, a certain supercooling degree of the water supply at the outlet of the economizer is maintained, the dry running of the boiler is maintained under the deep peak-shaving working condition, the water power stability is maintained, and the denitration system is continuously and stably put into operation.

Inventors

ZHANG LING
DU YANGYANG
SUN QING
WANG CHEN
LIU JIANDONG
DAI WEIQIANG
CHEN LEI
LIU WENKAI
XU YIJUN

Assignees

上海外高桥第三发电有限责任公司

Dates

Publication Date: 20260512
Application Date: 20250307

Claims (9)

1. The operation system configuration of the coal motor group based on water supply supplemental heating comprises a boiler, an oxygen removal system, a high-pressure cylinder, an existing last-stage high-pressure heater, a water supply pipeline and a steam pipeline, and is characterized in that the boiler comprises an economizer, a water-cooled wall and a superheater which are sequentially connected through pipelines, the high-pressure cylinder adopts a partial steam inlet mode to configure a regulating stage, the oxygen removal system, the existing last-stage high-pressure heater, the newly-added last-stage high-pressure heater and the 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 extraction pipeline connected between the steam inlet of the high-pressure cylinder and the steam inlet of the existing last-stage high-pressure heater, the main steam pipeline is provided with a regulating stage steam inlet valve group, a steam extraction isolation valve is arranged on the steam extraction pipeline, a steam side inlet of the newly-added external steam cooler is connected with a pressurizing module, and an inlet of the pressurizing module is connected with steam with the steam inlet of the newly-added external steam cooler, and the steam inlet of the newly-added external steam cooler is communicated with the steam inlet of the newly-added high-stage high-pressure heater.
2. The operating system configuration of claim 1 wherein a vapor compressor is disposed in the conduit of the boost module for boosting the vapor entering the boost module below the target extraction pressure level such that the pressure of the vapor below the target extraction pressure level is higher than the pressure of the last extraction of the high pressure cylinder after the vapor is boosted by the vapor compressor.
3. The operating system configuration of claim 2 wherein the vapor pressure at the vapor side outlet of the newly added external vapor cooler is higher than the final extraction pressure of the high pressure cylinder.
4. The operating system configuration of claim 3 wherein a newly added extraction isolation valve is disposed in the conduit of the booster module, the newly added extraction isolation valve being located at the front end of the vapor compressor.
5. The operating system configuration of claim 4 wherein the steam below the target extraction pressure level originates from a portion of the final extraction of the high pressure cylinder, and the inlet of the booster module is connected to the extraction conduit by a conduit.
6. The operating system configuration of claim 5 wherein the interface of the pressurization module to the extraction conduit is upstream of the extraction isolation valve.
7. The operating system configuration of claim 4 wherein the source of steam below the target extraction pressure level is either in the recuperative extraction or reheat system or in the superheater system in the present unit or in other units.
8. The operating system configuration of claim 1 wherein the number of valves of the regulator stage admission valve group is four or six.
9. An operating system arrangement according to any one of claims 1-8, characterized in that a throttling assembly is provided in the feed water or steam line from the economizer outlet to the high pressure cylinder inlet.

Description

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 an 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. For ultra (supercritical) units, the capacity is mainly 350MW, 660MW and 1000MW, and the capacity is also a small amount of 1200MW and 1350 MW. 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, has the uncertainty of the generated energy due to the new energy generating mode, and has to take the roles of a basic guarantee power supply and a flexible peak regulation power supply matched with the new energy for generating. Taking a certain 1000MW ultra-supercritical unit as an example, the dispatching load range of the regional power grid is 40% -100% THA, and the water supply flow of boiler equipment corresponding to the unit load is higher than the minimum flow for keeping the boiler running in a dry state, so that the boiler always keeps running in a dry state and does not have a dry-wet state conversion process in the current normal load dispatching range. However, with the rapid development of new energy, the regional power grid has now notified that the unit needs deep peak shaving cloud operation, and the lower limit of load scheduling needs to be as low as 20%, and the water supply flow of the boiler equipment corresponding to the 20% load of the unit is already lower than the minimum flow of the boiler kept in dry state operation, and the boiler will have to be turned into wet state operation. For super (super) critical units needing to participate in deep peak shaving operation, for example, the load change range is 20% -100% THA, wherein, when 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 dry state and the wet state of the boiler are frequently converted, the control of coal, water and wind is very difficult, and the non-stopping risk of the boiler is rapidly increased; (2) Under the deep peak-shaving working condition, the enthalpy of the water supply at the inlet of the water-cooled wall is increased, the water dynamic stability of the water-cooled wall of the boiler is poor, the risk of overtemperature pipe explosion of the water-cooled wall is increased sharply; (3) 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; (4) Under the wet running condition of the boiler, if the water separated from the steam-water separator at the outlet of the water-cooled wall of the boiler is directly discharged to the atmospheric expansion vessel, a large amount of working medium and energy loss are caused, the energy consumption of a unit is greatly increased, and the running economy is greatly reduced. Therefore, how to maintain the dry running of the boiler under the deep peak-shaving working condition, and keep the hydrodynamic stability and the continuous and stable operation of the denitration system becomes a problem to be solved. Disclosure of utility model The utility model aims to solve the technical problem of maintaining dry running of a boiler under the deep peak regulation working condition, keeping hydrodynamic stability and continuously and stably putting a denitration system into operation, and providing a flexible running system configuration of a coal motor group based on water supply supplementary heating. The utility model solves the technical problems by the following technical scheme: The utility model provides a running system configuration of a coal motor group based on water supply supplementary heating, which comprises a boiler, an oxygen removal system, a high-pressure cylinder, an existing last-stage high-pressure heater, a water supply pipeline and a steam pipeline, and is characterized in that the boiler comprises an economizer, a water-cooled wall and a superheater which are sequentially connected through pipelines, and the high-pressure cylinder adopts a partial steam inlet mode to configure an adjusting stage; the novel steam cooling device comprises a water supply pipeline, wherein an ox