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Continuous heat transfer sulfur dioxide conversion process

A technology of sulfur dioxide and heat removal, applied in inorganic chemistry, sulfur compounds, chemical instruments and methods, etc., can solve problems such as difficulty in removing heat, and achieve the effect of ensuring no corrosion, simple control, and simplified process flow

Active Publication Date: 2013-04-10
双盾环境科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention solves the problem that too much heat is difficult to remove during the conversion process of high-concentration SO2 flue gas, and provides a continuous heat transfer sulfur dioxide conversion process with advanced theory, simple structure, low processing difficulty, simple process operation and low engineering construction investment

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  • Continuous heat transfer sulfur dioxide conversion process

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Embodiment Construction

[0015] Continuous heat removal sulfur dioxide conversion process, the steps are:

[0016] 1) The flue gas from the sulfur dioxide blower enters the shell side of the primary conversion heat exchanger 1 through the pipeline 7 before conversion, and after being heated to the coal contact ignition temperature (420±10°C), enters the first reaction layer of the converter 3;

[0017] 2) The flue gas in step 1) undergoes oxidation reaction in the first-stage reaction layer of the converter 3, and the coal-contacting layer of the first-stage reaction layer is provided with an internal heat pipe 6, and cold air or cold water or low-pressure steam is passed into the internal heat pipe 6 , the heat generated by the oxidation reaction is removed by the cold air or cold water or low-pressure steam in the internal heat pipe 6, and the temperature of the converter 3 is controlled to be 520±10° C. by adjusting the flow rate of the cooling fan 2;

[0018] 3) Contains a lot of SO 3 The flue ga...

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Abstract

The invention discloses a continuous heat transfer sulfur dioxide conversion process, which is suitable for the sulfuric acid making industry. The process comprises the following steps of: allowing high-concentration SO2 smoke from a blower to pass through a primary conversion heat exchanger, heating to catalyst ignition temperature, introducing into a first-section reaction layer of a converter,controlling reaction temperature in the converter by adjusting the air quantity of a cooling fan, heating the primarily converted gas by using the primary conversion heat exchanger, and introducing the primarily converted gas into a first absorption tower; and introducing the smoke into a secondary conversion heat exchanger after SO3 is completely absorbed, heating the smoke to the catalyst ignition temperature, introducing the smoke into a second-section reaction layer of the converter, controlling reaction temperature in the converter by adjusting the air quantity of the cooling fan, heating the secondarily converted gas by using the secondary conversion heat exchanger, introducing the secondarily converted gas into a second absorption tower, and exhausting after SO3 is completely absorbed. The process overcomes a temperature control bottleneck in a high-concentration smoke conversion technology, a catalyst and steel for equipment are operated at tolerable lower temperature, and theconversion rate is over 99.85 percent.

Description

technical field [0001] The invention relates to a continuous heat removal sulfur dioxide conversion process, which is mainly applicable to the sulfuric acid production industry, especially the acid production industry using nonferrous metal smelting to produce high-concentration sulfur dioxide flue gas. Background technique [0002] Raw materials for pyrometallurgy in non-ferrous smelting enterprises such as copper, nickel, lead, and zinc are mostly sulfide ores. The traditional treatment method for the tail gas after smelting is to purify and remove dust and then oxidize it to produce sulfuric acid. With the advancement of smelting technology, smelting enterprises generally adopt the continuous smelting process of oxygen-enriched or industrial air, so flue gas with high concentration of SO2 is produced, which puts forward higher requirements for flue gas acid production equipment. For example, according to the existing acid-making process, it is necessary to dilute the smel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B17/74
Inventor 宋小良
Owner 双盾环境科技有限公司
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