Wide-load denitration and stable combustion system and method for assisting coal-fired unit

A technology for coal-fired units and loads, applied in separation methods, chemical instruments and methods, and indication of boiler working conditions, etc., can solve problems such as excessive nitrogen oxide emissions, damaged catalyst life, and increased ammonia consumption. Improve the outlet smoke temperature, ensure normal operation, and ensure the effect of operation

Inactive Publication Date: 2020-09-25
HUANENG POWER INT CO LTD RIZHAO POWER PLANT
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  • Abstract
  • Description
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Problems solved by technology

When the unit is in deep peak regulation, as the boiler load decreases, the flue gas temperature at the inlet of the denitrification device will drop below 300°C. Long-term operation at low and operating temperatures will cause the denitrification catalyst to lose its activity, increase the amount of ammonia used, and even cause nitrogen oxidation The discharge of pollutants exceeds the standard, and the peak regulation of the unit is suspended
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  • Wide-load denitration and stable combustion system and method for assisting coal-fired unit
  • Wide-load denitration and stable combustion system and method for assisting coal-fired unit
  • Wide-load denitration and stable combustion system and method for assisting coal-fired unit

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Embodiment Construction

[0024] The present invention will be described in detail below in conjunction with specific embodiments and accompanying drawings.

[0025] refer to figure 1 , a wide-load denitrification and stable combustion system for auxiliary coal-fired units, including hot water recirculation pipeline 5, boiler water supply valve 4, economizer water bypass pipeline 2, and the inlet of economizer water bypass pipeline 2 Set on the water supply pipe in front of the boiler water valve, the outlet of the economizer water bypass pipe 2 is set on the economizer water outlet pipe; the economizer water bypass pipe 2 is equipped with a valve 3

[0026] Such as figure 1 As shown, after the hot water flows out from the steam-water separator 6, the hot water recirculation is realized by using the existing boiler water circulation pump and the hot water recirculation pipeline 5, and the existing boiler water valve 4 is used to throttle and increase the pressure. increase the economizer water bypass...

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Abstract

The invention discloses a wide-load denitration and stable combustion system and method for assisting a coal-fired unit. The system involves a hot water recirculation pipeline, a boiler water feedingvalve and an economizer water bypass pipeline, wherein the economizer water bypass pipeline is arranged in front of the boiler water feeding valve and on an economizer water outlet pipeline; the economizer water bypass pipeline is provided with a valve, and the economizer water bypass pipeline is additionally arranged on the position, in front of the boiler water feeding valve, of a water feedingpipeline. Hot water recirculation is achieved through a boiler water circulating pump, and the boiler water feeding valve is used for adjusting the boiler water feeding flow to increase the pressure difference, so that flow of the economizer water bypass is increased; the water inlet amount of an economizer is reduced through the economizer water bypass pipeline, and meanwhile, high-temperature boiler water is injected into the water feeding pipeline through the boiler water circulating pump, so that the inlet water temperature of the economizer is increased, the heat exchange amount of the economizer is reduced, and the SCR inlet flue gas temperature is increased; and the water amount of an economizer water feeding bypass is reasonably adjusted, so that it is guaranteed that economizer water feeding is achieved, boiling is avoided, and normal operation of denitration under the low load is guaranteed while safe operation is achieved.

Description

technical field [0001] The invention belongs to the field of technical transformation of coal-fired units, and in particular relates to a wide-load denitrification and stable combustion system and method for assisting coal-fired units. Background technique [0002] At present, the working temperature of the denitrification devices of most coal-fired power units is 300-420°C. When the unit is in deep peak regulation, as the boiler load decreases, the flue gas temperature at the inlet of the denitrification device will drop below 300°C. Long-term operation at low and operating temperatures will cause the denitrification catalyst to lose its activity, increase the amount of ammonia used, and even cause nitrogen oxidation The discharge of pollutants exceeds the standard, and the peak regulation of the unit is suspended. In the deep peak-shaving renovation project of the power plant, most of the focus is on improving the low-load stable combustion capability of the boiler, ignor...

Claims

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Application Information

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IPC IPC(8): F22B37/34F22B37/38F22D7/00B01D53/86B01D53/56
CPCB01D53/8631B01D2251/2062B01D2258/0283F22B37/34F22B37/38F22D7/00
Inventor 张义政王成华辛以波李守磊申为胜徐宝权张永云
Owner HUANENG POWER INT CO LTD RIZHAO POWER PLANT
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