Gas supply system and method for gasification air of electrostatic precipitation ash hopper

Abstract

A gas supply system and method for gasification air of an electrostatic precipitation ash hopper comprises a gasification fan, an inlet of the gasification fan is connected with a flue gas outlet of a coal-fired boiler through flue gas pipelines with filter screens, an outlet of the gasification fan is connected to the bottom of the electric precipitation ash hopper, the flue gas outlet of the coal-fired boiler is connected with an inlet pipeline, the inlet pipeline is connected with a first filter screen and a second filter screen, the first filter screen and the second filter screen are parallel duplex filter screens, the flue gas pipelines of outlets of the first filter screen and the second filter screen are converged and then connected with a gasification fan, and the gasification fan converges boosted flue gas and then is connected with the electric precipitation ash hooper through an outlet pipeline, a gasification fan outlet pneumatic door and an ash hopper gasification air pipeline. According to the system, the gasification air supply temperature can be matched with the ash content temperature in the ash hopper, disturbance of equipment abnormity to electric dust removal operation is reduced, the unstable problems of abnormal tripping and the like caused by long-term electric heating operation are solved, and the economical efficiency is good.

Description

technical field [0001] The invention relates to the technical field of dust removal, relates to an electric dust removal system, and in particular to an electric dust removal ash hopper gasification air supply system and method. Background technique [0002] Coal-fired power plant electrostatic precipitator is used to remove a large amount of post-combustion ash contained in boiler flue gas, and is an important component of boiler thermal system. The gasification wind of the electrostatic precipitator ash hopper makes the ash deposited in the ash hopper reach the state of gas-solid two-phase flow, prevents dust compaction, and facilitates pneumatic transportation. [0003] At present, the gasification air supply system of the ash hopper of the conventional design adopts a Roots blower to supply air, and the gas is heated by electric heating and then sent to the ash hopper to achieve the design purpose. This design has two problems of economy and safety: [0004] 1. Electri...

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Problems solved by technology

This design has two problems of economy and safety:

[0004] 1. Electric heating is a high-energy-consuming equipment, and long-term operation will increase the power consumption of the unit and affect the economic benefits of the unit;

[0005] 2. The combined air supply method of Roots blower and electric heating has poor reliability. For example, the abnormal tripping of Roots blower or electric heating will make the air supply temperature and flow unable to be guaranteed. Pneumatic conveying to the ash storage will lead to serious ash hopper full of ash, which will affect the efficiency of electrostatic precipitator or force the electrostatic precipitator to quit, resulting in serious consequences of environmental protection index not up to standard

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