A method suitable for double alkali desulfurization

By setting up ventilation ducts and heating devices at the bottom of the flue gas pipeline and desulfurization tower, calcium sulfite is efficiently decomposed into calcium oxide and sulfur dioxide, solving the problem of silt and blockage in the desulfurization tower, realizing the reuse of desulfurization liquid and improving the reaction efficiency.

CN116036822BActive Publication Date: 2025-09-02TONGDE LOVE (NINGXIA) CHEMICAL CO LTD
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Patent Information

Application Number
CN202310085616.2
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-02-09
Publication Date
2025-09-02
Estimated Expiration
2043-02-09

AI Technical Summary

Technical Problem

During the existing double alkali desulfurization process, the calcium sulfite precipitation in the desulfurization tower is difficult to discharge, resulting in siltation and blockage, affecting the desulfurization reaction and increasing the work burden.

Method used

The outer wall of the flue gas pipeline is equipped for preheating and cooling. A calcium sulfite collection tank is installed at the bottom of the desulfurization tower and heated through a U-shaped tube and an electric heating wire. The calcium sulfite is decomposed at high temperature to calcium oxide and sulfur dioxide, and the calcium hydroxide is sent to the regeneration tank through a push mechanism for reduction, and the reaction is carried out by air oxidation and desulfurization liquid.

Benefits of technology

Effectively prevent calcium sulfite blockage, improve desulfurization efficiency, reduce the work burden of subsequent treatment, and realize the reuse of desulfurization liquid.

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Abstract

The present invention discloses a method for double alkali desulfurization, which relates to the field of double alkali desulfurization. The method comprises the following steps: step 1: cooling the flue gas, wherein a ventilation pipe is provided on the outer wall of the flue gas duct; step 2: desulfurization reaction, wherein the flue gas after cooling enters the desulfurization tower and is sprayed with alkali solution; step 3: high temperature decomposition, wherein the bottom of the calcium sulfite collecting tank is heated at high temperature; step 4: oxidation and reduction, wherein the calcium sulfite collecting tank is in contact with the air; step 5: desulfurization and reduction, wherein the calcium sulfite is pushed into the regeneration tank by a pushing mechanism to react with the desulfurization liquid. The calcium sulfite of the present invention is decomposed into calcium oxide and sulfur dioxide by heat, and the sulfur dioxide is directly discharged after being detected inside the desulfurization tower. The internal calcium oxide absorbs moisture in the air to generate calcium hydroxide, which can then be discharged into the regeneration tank to facilitate the reduction of the desulfurization liquid into an absorbent. This process prevents the calcium sulfite from being blocked while reducing the workload of the staff in subsequent processing.
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