System device and method for recycling sulfur dioxide from fume to prepare sulfur

Abstract

The invention discloses a system device and a method for recycling sulfur dioxide from fume to prepare sulfur. The device comprises three units of an absorption and pyrolysis unit, a reduction unit and a krauss unit, wherein the absorption and pyrolysis unit mainly consists of a cooling tower, an absorbing tower, a purifier, a circulation pump, a regeneration pyrolysis tank and a rich and lean liquid heat exchanger; the reduction unit mainly consists of a mixed gas generation system, a reduction reactor and a sulfur condenser; the krauss unit mainly consists of a krauss reactor and a sulfur condenser. The method comprises the steps that the absorption and pyrolysis unit absorbs and pyrolyzes the fume so as to obtain a pure sulfur dioxide gas, and the reduction unit converts the sulfur dioxide into elementary sulfur through catalysis reaction, wherein the conversion per pass is not less than 95%, and the total conversion is greater than 99.5%. The sulfur dioxide content that the fume is completely discharged is not greater than 50 milligrams per normal cubic meter. The sulfur dioxide is converted into national best grade sulfur products which are stable in property and convenient to store and transport, with high efficiency and low cost, the desulfuration operation cost is lower than the value of a recycled product, and the products can be widely applied to chemistry and thermal power industry.

Description

technical field [0001] The invention relates to industrial equipment such as chemical industry and thermoelectricity, in particular to a system device and a method for recovering sulfur dioxide from flue gas to prepare sulfur. Background technique [0002] Situation and Causes of Sulfur Pollution [0003] China is the largest source of sulfur pollution in the world. The emission of sulfur dioxide has exceeded 20 million tons for many years and continues to grow. Among them, the emission of sulfur dioxide from thermal power plants accounts for half of the total, and the emission of sulfur dioxide from acid rain control areas and sulfur dioxide control areas accounts for 60% of the total. . 1 / 3 of the urban population in the country breathes heavily polluted air, and 1 / 3 of the land is eroded by acid rain. [0004] 90% of the country's sulfur dioxide is emitted by coal combustion, and the sulfur in boiler flue gas is the largest source of sulfur pollution. Although all powe...

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Problems solved by technology

The liquid sulfur separated from the Claus condensers at various stages is molded into solid sulfur products, and the tail gas from the separated liquid sulfur contains a small amount of unreacted hydrogen sulfide, which is completely incinerated into sulfur dioxide by the incinerator with excess air. Exhausted into the atmosphere, the sulfur dioxide content in the tail gas after incineration is relatively high, so the recovery of sulfur is not complete

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