Desulphurizing device based on internal circulation W type multi-fluid alkali fog generator and desulphurizing method

Abstract

The invention relates to a desulphurizing device based on an internal circulation W type multi-fluid alkali fog generator and a desulphurizing method in the technical field of purifying treatment of smoke. The desulphurizing device comprises a two-section type desulphurizing reaction tower, a reaction tower inlet smoke flow adjusting device, a W type multi-fluid alkali fog generator, an atomizing nozzle and a desulfurizing agent storing and delivering system, wherein the two-section type desulphurizing reaction tower comprises a lower arch structure and an upper variable cross-section structure; the W type multi-fluid alkali fog generator is arranged on an arch top of the lower arch structure of the two-section type desulphurizing reaction tower; the atomizing nozzle is arranged in the center of the W type multi-fluid alkali fog generator; and the desulfurizing agent storing and delivering system is connected with the W type multi-fluid alkali fog generator. The invention improves the contact efficiency and the uniform mixture of the multi-fluid desulphurizing alkali fog prepared on line and the smoke in the reaction tower and the desulphurizing efficiency and the safety of the system by the internal circulation of a structural reinforcing desulphurizing agent particle of the desulphurizing reaction tower with variable cross-section design and thoroughly solves the problem of bonding of wet type desulphurizing alkali fog on the wall surface of the reaction tower.

Description

technical field [0001] The invention relates to a device and a purification method in the technical field of flue gas purification treatment, in particular to a desulfurization device and a desulfurization method based on an internal circulation W-type multi-fluid alkali mist generator. Background technique [0002] The semi-dry flue gas desulfurization technology for the removal of sulfur dioxide from the flue gas exhausted by pulverized coal boilers, garbage incinerators or other combustion equipment mainly includes spray drying flue gas desulfurization, calcium spraying in the furnace, and tail humidification to activate flue gas desulfurization and circulation. For fluidized bed flue gas desulfurization, etc., calcium-based desulfurizers (limestone, lime, calcium hydroxide, etc.) are mostly used for flue gas desulfurization. [0003] The spray drying method of flue gas desulfurization has the advantages of relatively simple system, low investment, dry powder of desulfuri...

AI Technical Summary

Problems solved by technology

These deficiencies are mainly: (1) due to the low solubility of lime in water, it must be made into lime emulsified slurry, and its slurry preparation system is relatively complicated and huge; Concentration, uneven particle size, etc. cause poor atomization, and will lead to blockage and wear of the atomizing nozzle

(3) The atomization of lime slurry is difficult, the particle size of the atomized droplets is large, and the desulfurization reaction rate is low, resulting in a large volume of the spray drying absorption tower (the residence time of the flue gas is generally more than 10 seconds), which affects the further reduction of the investment cost of the desulfurization equipment and its application in the desulfurization transformation of active power plants

[0004] Calcium injection in the furnace and humidification and activation at the tail, or simple flue gas absorbent injection flue gas desulfurization is another common semi-dry flue gas desulfurization method, because the desulfurizer and activation water are sprayed into the desulfurization flue or activation reactor respectively The problem of pulping and spraying has been solved, but there are still some difficult problems to overcome: (1) under the condition of pulverized coal furnace, the mass ratio of fly ash in the flue gas to the added fresh desulfurizer is generally more than 10 times , this ratio will be even higher for coal with high ash content

But its obvious disadvantages are: (1) The material circulation rate is high, and what is humidified is still a large amount of fly ash in the circulating material instead of fresh or incompletely reacted desulfurizer; the resistance of the desulfurization system is large, generally between 1500-2500Pa During the period, the induced draft fan needs to be replaced when using CFB-FGD to transform the flue gas desulfurization of the existing unit. At the same time, the power consumption of the desulfurization system will increase and the economy will deteriorate; (2) The outlet of the circulating fluidized bed reaction tower is the follow-up dust collector The solid material concentration in the imported flue gas is as high as 600-800g / m 3 , which is much higher than the soot concentration at the inlet of the dust collector of the pulverized coal boiler of the power station and the waste incinerator, which greatly increases the load of the dust collector

In this multi-fluid alkali mist generator flue gas desulfurization method, the multi-fluid alkali mist generator is usually arranged on one side at the elbow of the inlet flue of the desulfurization reaction tower. Inhomogeneity and possible sticking of wet desulfurization alkali mist on the back wall of the desulfurization tower

Moreover, the absorbent passes through the desulfurization tower once. Although the resistance of the desulfurization system is significantly lower than that of circulating fluidized bed flue gas desulfurization, the desulfurization efficiency and the utilization rate of absorbent are lower than those of circulating fluidized bed flue gas desulfurization.

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