System and method for efficiently utilizing desulfurization by-products

Abstract

The invention discloses a system for efficiently utilizing desulfurization by-products. The system comprises a desulfurization and dust removal device, a waste ash storage tank, a gypsum preparation tank and a finished gypsum product storage device; flue gas enters the desulfurization and dust removal device through a main flue, tail gas generated by the desulfurization and dust removal device issucked by a second fan and finally discharged by a chimney, waste ash generated by the desulfurization and dust removal device is conveyed to the waste ash storage tank through a pipeline, the waste ash storage tank is communicated with the top of the gypsum preparation tank through a pipeline, the bottom of the gypsum preparation tank is communicated with an air conveying pipeline, and the main flue is communicated with the air conveying pipeline through a bypass flue; the gypsum preparation tank is internally provided with a stirring device, the top of the gypsum preparation tank is providedwith a gas outlet and a water adding pipe, the gypsum preparation tank is communicated with the finished gypsum product storage device through a discharging pipe, and the discharging pipe is providedwith a slurry conveying pump and a dewatering device. The system truly achieves the efficient utilization of the desulfurization by-products, can effectively solve the problem of large treatment difficulty of the desulfurization by-products, increases the economic benefits, saves energy and protects the environment.

Description

technical field [0001] The invention relates to a system and method for efficient utilization of desulfurization by-products, and belongs to the technical field of flue gas dry / semi-dry desulfurization by-product treatment. Background technique [0002] Since the 1990s, the industry has developed rapidly, and the consumption of coal has also increased year by year. As the main pollutant produced by coal combustion, sulfur dioxide is a major pollutant, and its total emission is quite large. There is an increasing trend. Acid rain will cause a large reduction in the yield of grain, vegetables and fruits, and even the entire farmland will fail to harvest; Corrosion, acidification of soil and water bodies; sulfur dioxide in the air can also cause human respiratory diseases, resulting in an increase in human mortality; sulfur dioxide has become an important factor restricting economic and social development; Desulfurization technologies include dry desulfurization, wet desulfuri...

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Problems solved by technology

[0002] Since the 1990s, the industry has developed rapidly, and the consumption of coal has also increased year by year. As the main pollutant produced by coal combustion, sulfur dioxide has a huge amount of emissions; There is an ever-increasing trend. Acid rain will cause a large reduction in the production of food, vegetables and fruits, and even the entire farmland will fail; it will harm forest trees, reduce their volume sharply, and even die in patches of forest trees; acid rain will also cause metal and building materials to Corrosion, acidification of soil and water; sulfur dioxide in the air can also cause human respiratory diseases, causing human mortality to increase year by year; sulfur dioxide has become an important factor restricting economic and social development; the current society attaches great importance to ecological environment protection. The current desulfurization technologies include dry desulfurization, wet desulfurization and semi-dry desulfurization. Among them, the wet desulfurization process is currently mostly used in coal-fired power plants, but its system is complex, the operating cost is high, and the desulfurization wastewater treatment is difficult; dry and semi-dry The desulfurization efficiency of the desulfurization process is high, the construction investment is small, the floor space is small, and it has a good development prospect. It is suitable for the desulfurization transformation of small and medium-sized units and old units. Stable and difficult to deal with. The desulfurization by-product is a kind of desulfurization waste ash, which is generally treated as solid waste, which consumes considerable human and financial resources. As a result, dry and semi-dry desulfurization processes are not widely used

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