Rapid bed building system for semi-dry desulfurization

Abstract

The invention relates to the technical field of flue gas treatment, in particular to a rapid bed building system for semi-dry desulfurization. The system comprises at least two groups of dust removers, and each group of dust removers corresponds to different boilers and is used for removing dust of flue gas in the corresponding boilers so as to filter and retain mixed ash containing raw flue gas ash, desulfurization reaction products and unreacted slaked lime. An original ash conveying pipeline is optimized, a bin crossing pipeline for connecting a furnace bin pump in a normal working state and a furnace bin pump in a bed building state is additionally arranged, a bed building pneumatic control valve is arranged on the bin crossing pipeline, and whether coal ash in an ash hopper of one unit is directly conveyed to an ash hopper of a unit to be started or not is controlled in a pneumatic conveying mode, so as to shorten the ash storage process of the ash hopper at the initial stage of unit starting, thereby achieving the purpose of rapid bed building, enabling the sulfur dioxide concentration at the outlet of the desulfurization tower to meet the environmental protection index requirement, and avoiding the sulfur dioxide exceeding time of about 10 hours; moreover, the equipment modification cost is low.

Description

technical field [0001] The invention relates to the technical field of flue gas treatment, in particular to a rapid bed building system for semi-dry desulfurization. Background technique [0002] Semi-dry desulfurization of thermal power generating units is one of the main processes for thermal power desulfurization in my country. After application in recent years, this process has become very mature and can meet the requirements of ultra-clean emissions. Due to the compaction of circulating ash, it is necessary to exhaust the desulfurized circulating ash inside the ash hopper of the dust collector, which also causes waste of desulfurizing agent in the circulating ash. In the initial stage of unit start-up, due to the low load, less coal ash, and insufficient desulfurization circulating ash, the bed cannot be established for a long time, and there is a window period for desulfurization flue gas emission, resulting in the outlet sulfur dioxide concentration failing to meet env...

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Problems solved by technology

[0002] Semi-dry desulfurization of thermal power generating units is one of the main processes for thermal power desulfurization in my country. After application in recent years, this process has become very mature and can meet the requirements of ultra-clean emissions. Circulating ash hardens, it is necessary to exhaust the desulfurization circulating ash inside the ash hopper of the dust collector, and at the same time, it also causes waste of desulfurization agent in the circulating ash

In the initial stage of unit start-up, due to the low load, less coal ash, and insufficient desulfurization circulating ash, the bed cannot be established for a long time, and there is a window period for desulfurization flue gas discharge, resulting in the outlet sulfur dioxide concentration failing to meet environmental protection requirements

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