Coal-fired unit ash silo gasification air supply system and method

Abstract

The invention discloses a coal-fired unit ash silo gasification air supply system and a method. The coal-fired unit ash silo gasification air supply system comprises a gasified blower, an inlet of the gasified blower is in communication with a flue gas pipeline to be connected with a purified flue gas outlet of a desulfurizing tower, an outlet of the gasified blower is connected with a heat exchanger arranged in front of an electric dust remover, and after the purified flue gas is heated by high-temperature flue gas of the heat exchanger, the purified flue gas is fed into an ash silo through an ash silo gasification air pipeline. According to the coal-fired unit ash silo gasification air supply system and the method, the gasification air supply temperature can be matched with the ash content temperature in the ash silo, disturbance caused by equipment abnormity to system and unit operation is reduced, unstable problems such as electric heating abnormity tripping and the like are avoided, and the economical efficiency is good.

Description

technical field [0001] The invention relates to the technical field of storage and transportation of ash silos, in particular to an ash silo gasification air supply system and method for a coal-fired unit. Background technique [0002] The coal-fired unit ash store is used to store and transport the post-combustion ash in the boiler flue gas removed by electrostatic precipitator, and is an important component of the coal-fired unit ash store storage and transportation system. The gasification wind of the ash silo is passed into the ash silo, and the ash deposited in the ash silo flows under the agitation of the wind to prevent dust compaction and facilitate discharge and transportation. In order to ensure a good gasification effect and reduce the compaction caused by the temperature difference between the gasification wind and the ash, the gasification wind sent to the ash storage needs to be heated to a temperature similar to the ash content before entering the ash storage....

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Problems solved by technology

[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 operating life of electric heating is limited, and the reliability of continuous heating is poor. If the electric heating is abnormally tripped or the power drops, the temperature of the air supply will not be guaranteed. The low-temperature gasification air sent to the ash storage will cause dust compaction, and seriously will lead to ash The reservoir is blocked by ash, and the coal-fired unit is forced to shut down because the ash cannot be discharged

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