Integrated method for modification, activation, treatment delivering and spraying the absorbent

Abstract

The invention relates to an integrated method of absorbent modification, activation, treatment, transportation and spraying in the technical field of flue gas desulfurization / denitrification. The original absorbent is sent to the airflow crushing device, where it is crushed and airflow crushed in the airflow crushing device, so that the original absorbent is further broken and new cracks and gaps are formed, so that the specific surface area and pores are increased, and at the same time, the turbulent mixing of the crushed airflow and the interaction of particles Under the action of impact, the absorbents are mixed and attached to each other, so that the original absorbents are modified and activated; the absorbents modified and activated in the jet milling device are sent by the pulverizing airflow to the pneumatic conveying system connected to the outlet of the jet milling device. Pipeline, and transported to the injection point in the form of gas-solid two-phase flow through the pneumatic conveying pipeline, and directly sprayed out to the flue gas through the nozzle for desulfurization / denitrification. This method can significantly increase the utilization rate of the absorbent.

Description

technical field [0001] The invention relates to a flue gas purification technology, in particular to an integrated method of absorbent modification, activation, treatment, transportation and injection, which is suitable for the technical field of removing sulfur oxides / nitrogen oxides in flue gas. Background technique [0002] Whether in power plants or in other industries, the sulfides and nitrogen oxides contained in the flue gas produced by boilers burning coal are one of the main sources of air pollution. As the problem of environmental pollution becomes more and more serious, people pay more and more attention to environmental governance and environmental protection, and have formulated strict flue gas emission standards. A variety of boiler flue gas purification treatment technologies have emerged to remove the pollutants in the flue gas. Sulfides and nitrogen oxides. The use of absorbents for dry flue gas desulfurization / denitrification is one of the main methods of ...

AI Technical Summary

Problems solved by technology

[0004] ①The effective activity of the absorbent is low: Since the absorbent is prepared by mechanical grinding, the original micropores of the particles will be filled while the fine particles are obtained. Although the particle size of the particles becomes smaller, the outer surface area increases accordingly, but the pores The loss of the porosity reduces the porosity, which not only partially offsets the contribution of the smaller particle size to the increase of the specific surface area of ​​the absorbent to a certain extent, but also loses the surface activity of the absorbent part, and makes it difficult for the smoke to diffuse into the particles, making the inside The activity cannot be effectively exerted;

[0006] ③Absorbent activity reduction: During the use of the absorbent, not only the dynamic and continuous modification and activation treatment to improve the activity of the absorbent cannot be realized, but also the absorbent cannot be well dispersed due to too many intermediate links, resulting in coagulation. Combination, agglomeration, etc. lead to the reduction of the original activity;

[0007] ④Low utilization rate of absorbent: In the normal particle size range (30-100 μm) of the absorbent used in the above process, when the Ca / S molar ratio is about 2.5, the desulfurization efficiency is only about 65-75%. The utilization rate of the agent, that is, the removal efficiency / calcium-sulfur molar ratio is only about 26-30%, especially the calcium spraying tail humidification activation desulfurization technology in the furnace, if the fly ash itself has about 15% under the tail humidification condition. The desulfurization efficiency factor, the actual utilization rate of the absorbent is only about 20% to 24%.

It can be seen that the utilization rate of absorbents of the same kind of technology is extremely low, and a large amount of absorbents are wasted to form new solid waste

Usually, the desulfurization / denitrification efficiency has to be maintained or improved by sacrificing the amount of absorbent, and at the same time, it increases the difficulty of subsequent treatment of by-products

[0008] ⑤ Due to the low utilization rate of the absorbent, the amount of the absorbent is large, resulting in high operating costs

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