Pulverized coal oxygen-enriched burner meeting requirements of set deep peak load regulation, and system thereof

Abstract

The invention provides a pulverized coal oxygen-enriched burner meeting the requirements of set deep peak load regulation, and a system thereof, and belongs to the field of coal-fired power generation. The pulverized coal oxygen-enriched combustion system comprises a liquid oxygen storage tank, a liquid oxygen supply pump, a gasifier, a buffer tank, a pipeline valve, an exhaust gas and oxygen heatexchanger and the pulverized coal oxygen-enriched burner. Liquid oxygen stored in the liquid oxygen storage tank is conveyed to the gasifier through the liquid oxygen supply pump, evaporates to gasify into oxygen, is subjected to pressure stabilization in the buffer tank, and enters the exhaust gas and oxygen heat exchanger through the pipeline valve to be heated, and when the temperature reachesthe range from 650 DEG C to 700 DEG C, the oxygen enters the pulverized coal oxygen-enriched burner for ignition to form stable flames. According to the pulverized coal oxygen-enriched burner meetingthe requirements of set deep peak load regulation, and the system thereof, the oxygen-enriched burner carries out stable combustion during starting the low-load operation, the system has the self-stabilization combustion function, and has the advantages of being low in ignition temperature, high in combustion strength, high in combustion speed, high in temperature and complete in combustion reaction, and the boiler stable combustion and low-load operation cost is reduced.

Description

technical field [0001] The invention relates to a pulverized coal oxygen-enriched combustion system meeting the deep peak regulation requirements of a unit, belonging to the field of coal-fired power generation. Background technique [0002] In coal-fired power plants, it has always been a difficult problem to reduce the cost of boiler start-up and low-load stable combustion. With the excess installed capacity of thermal power in recent years, the load rate of many units is very low, and more thermal power units are required to participate in peak regulation of the power grid. Under ultra-low load conditions, the furnace volume heat load, cross-sectional heat load, and furnace center temperature also decrease. Generally, when it is lower than 30%, the entrainment of hot flue gas can no longer meet the requirements for pulverized coal ignition, let alone stable combustion. . [0003] At present, the minimum steady combustion load without oil input for domestic unit boiler de...

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Problems solved by technology

[0003] At present, the minimum steady combustion load without oil input for domestic unit boiler design is 30%, but in the actual operation process, oil, gas or plasma burners are generally used to achieve stable combustion when the rated load is 40% to 50% , the cost of boiler start-up and low-load stable combustion is relatively high

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