Out-tower oxidation method for limestone gypsum method wet type desulphurization, and desulphurization system of out-tower oxidation method
A wet desulfurization and desulfurization system technology, applied in the field of desulfurization, can solve the problems of high dust content in flue gas emissions, difficult distribution of oxidation spray guns, and oxidation of solution at the bottom of the tower, so as to reduce operating costs, facilitate widespread application, and solve secondary pollution. Effect
Inactive Publication Date: 2015-11-25
张波
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Problems solved by technology
But there are two main problems in this oxidation system: 1, the oxidation efficiency is low
This process system uses several oxidation spray guns to blow air into the slurry in the tower to achieve oxidation, but it is difficult for the oxidation spray guns to be evenly distributed at the bottom of the tower, so it is difficult to fully oxidize the bottom solution by simply relying on the oxidation spray guns
2. The system is easy to block
The oxidized liquid at the bottom of the tower forms insoluble calcium sulfate. With the continuous accumulation, the calcium sulfate in the pipeline gradually increases, causing some pipelines to gradually scale or even block, thus causing the system to be shut down and affecting normal production.
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[0020] Example: see figure 1 with figure 2 , a limestone gypsum method wet desulfurization external oxidation method provided in this embodiment, which includes the following steps:
[0021] (1) The flue gas enters the desulfurization tower 1 from bottom to top;
[0022] (2) The circulation pump 2 pumps the desulfurization liquid into the middle and upper part of the desulfurization tower 1, and contacts with the flue gas countercurrently from top to bottom to absorb sulfur dioxide;
[0023] (3) The liquid after desulfurization at the bottom of the tower is driven into the oxidation tank 4 by the self-priming jet pump 3 for forced oxidation; specifically, the oxidation tank 4 includes a tank body 41 and a plurality of jet-suction oxidizers 42, a plurality of The ejector-suction oxidizer 42 is evenly inserted on the top of the tank body 41, and an air distributor is installed in the tank body 41. The jet-suction oxidizer 42 includes a pipe body 421, the upper end of the pip...
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The invention discloses an out-tower oxidation method for limestone gypsum method wet type desulphurization, and a desulphurization system of the out-tower oxidation method. The flue gas enters a desulphurization tower from bottom to top; a circulating pump pumps the desulphurization liquid in the desulphurization tower for absorbing sulfur dioxide in the flue gas. The liquid desulfurized at tower bottom is forcibly oxidized in an oxidation tank, and then filtered by a filter, added with absorbing agents then returns back to the desulfurization tower. Out-tower oxidation, a jet-absorbing type oxidizer and an air distributor are combined so that oxidation efficiency of desulfurization liquid is largely promoted. A circuit that clear liquid returns to the tower is formed, thereby avoiding calcium sulfate sediment and resulting blocking. The flue gas is purged with water before going out of tower, which eventually resolves problems of the second pollution and unqualified flue dust emission. The desulfurization system has advantages of a simple and reasonable structure, low cost, easy implementation, and is easily generalized.
Description
technical field [0001] The invention belongs to the technical field of desulfurization, and in particular relates to an external oxidation method for limestone gypsum wet desulfurization. Background technique [0002] The traditional limestone gypsum desulfurization process includes a slurry preparation system, a circulation system, an oxidation system, and a gypsum post-treatment system. The oxidation system is composed of fan, oxidation spray gun and so on. But there are two main problems in this oxidation system: 1. The oxidation efficiency is low. This process system uses several oxidation lances to blow air into the slurry in the tower to achieve oxidation. However, it is difficult for the oxidation lances to be evenly distributed at the bottom of the tower, so it is difficult to fully oxidize the solution at the bottom of the tower solely by oxidation lances. 2. The system is easy to block. The oxidized liquid at the bottom of the tower forms insoluble calcium sulfa...
Claims
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Inventor 张波
Owner 张波