Desulfurization system of circulating fluidized bed boiler

Abstract

The invention discloses a desulfurization system of a circulating fluidized bed boiler. The desulfurization system comprises a cyclone separator (12), wherein the upper part of the cyclone separator (12) is connected with the upper part of a hearth (11) of the boiler; the lower part of the cyclone separator (12) is connected with the lower part of the hearth (11) through a material returning pipe (13); the material returning pipe (13) is provided with a desulfurization agent inlet (10); and the desulfurization agent inlet (10) is formed in a negative-pressure position of the material returning pipe (13). The desulfurization agent in the desulfurization system can be easily sprayed into the boiler, the desulfurization efficiency is high and the energy consumption is low.

Description

technical field [0001] The invention relates to the field of power generation, in particular to a desulfurization system of a circulating fluidized bed boiler. Background technique [0002] SO 2 As the most important pollutant in the flue gas emitted by the circulating fluidized bed boiler of the coal-fired power plant, its emission is subject to strict restrictions. Therefore, the circulating fluidized bed boiler of the coal-fired power plant is usually equipped with a desulfurization system to reduce The exhaust gas produced by coal is desulfurized, so as to ensure the efficient and reliable operation of the flue gas desulfurization system and reduce environmental pollution. [0003] Circulating fluidized bed boiler is a device that uses clean and efficient low-quality coal to generate electricity. It usually uses flue gas desulfurization by adding limestone and other desulfurizers to the boiler for desulfurization, and the desulfurization efficiency can reach 90%. The b...

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Problems solved by technology

[0005] However, in the above injection positions, the pressure in the furnace is basically in the positive pressure range, which makes it difficult to inject the desulfurizer. The desulfurizer needs to be transported by high-pressure wind and pneumatically before it can enter the boiler.

Due to the large suspension concentration of pneumatic conveying, the fluidization performance of the desulfurizer is poor, and the state of pneumatic conveying is unstable, resulting in poor desulfurization effect; High power consumption, severe pipeline wear, and desulfurizers such as limestone are easy to absorb moisture and harden, often causing pipeline blockage

At the same time, due to the endothermic calcination and decomposition after the desulfurizer is put in, the bed temperature of the circulating fluidized bed boiler decreases, which leads to the deterioration of the combustion state in the dense phase zone to a certain extent

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