Treating method for sulphur dioxide flue gas
A sulfur dioxide and flue gas technology, applied in chemical instruments and methods, separation methods, sulfur preparation/purification, etc., can solve the problems of affecting SO2 absorption effect, high cost of desulfurization process, secondary environmental pollution, etc. The effect of low transportation and handling costs, and reduced operating costs
Inactive Publication Date: 2008-08-27
CENT SOUTH UNIV
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Problems solved by technology
[0004] 1) Due to the product CaSO generated after absorbing sulfur dioxide 3 and CaSO 4 It is insoluble, very easy to CaO and Ca(OH) 2 form a package, affecting SO 2 The absorption effect, especially the low concentration of sulfur dioxide flue gas absorption effect is worse
[0005] 2) After absorbing sulfur dioxide, the output contains CaSO 3 and CaSO 4 and other waste residues, which can easily cause secondary pollution to the environment
[0006] 3) Absorption of sulfur dioxide consumes CaO or Ca(OH) 2 , high cost of desulfurization process
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Embodiment 1
[0036] Example 1: containing SO 2 Flue gas, whose main component is SO 2 1935mg / m 3 , CO 18.0% (volume), CO 2 24.0% (volume), N 2 56.0% (volume); industrial sodium sulfide, its main component is: Na 2 S>60%, industrial coal, fixed carbon content 67.5%.
[0037] The industrial sodium sulfide 1000g of above-mentioned composition, is mixed with 20.0L solution, filters out insoluble matter, and the concentration of sodium sulfide is 31.5g / L. Add the prepared sodium sulfide solution into two absorption barrels, the solution in each barrel is 10L. Connect the two-stage absorption system, and the above-mentioned sulfur dioxide-containing flue gas passes through the two absorption barrels at a flow rate of 150L / min at 24°C. Install a pH meter to measure the pH value of the solution in the first-stage absorption bucket. SO in tail gas after second stage absorption 2 The content is 38mg / m 3 , SO 2 The absorption rate is 98.04%. When the pH value of the solution in the first-st...
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An abatement method for sulfur dioxide flue gas is disclosed. The sulfur dioxide flue gas is absorbed by sodium sulfide solution, the absorption solution products elementary substance sulfur via autoxidation reduction reaction. The seriflux with sulfur and sodium sulphate is separated after reaction to obtain the elementary substance sulfur, and the solution with sodium sulphate is concentrated and crystallized to get anhydrous sodium sulfate, which is regenerated to be sodium sulfide absorbent after reacted. Compared with other method, the invention has the following characters: there is a rapid absorption speed and a high absorption ratio, using the sodium sulfide solution to absorb SO2 in the flue gas; SO2 in the flue gas is reclaimed in the state of solid elementary substance sulfur is convenient in storage and transport, and reduces the operation cost of SO2 deprivation in flue gas; the method is actualized without waste residue and liquid waste; concentration range of the SO2 in the flue gas treated is wide that is the invention can treat with SO2 flue gas of high concentration but also low concentration, especially for low concentration; the treatment cost is low.
Description
technical field [0001] The invention relates to a treatment method for flue gas containing sulfur dioxide in the field of environmental protection. The method can prepare elemental sulfur from the flue gas of sulfur dioxide. Background technique [0002] Metallurgy, thermal power generation and chemical industry produce a large amount of low-concentration sulfur dioxide flue gas, causing serious pollution to the environment. At present, the treatment method for low-concentration sulfur dioxide in flue gas is to use alkali absorption, and the absorbent used is mainly lime or limestone. There are three main types of industrial applications, namely wet method, dry method and semi-dry method. The common feature of these three methods is that the use of CaO or CaCO 3 As an absorbent, the sulfur dioxide in the flue gas reacts with it to form CaSO 3 , or generate CaSO in the presence of oxygen 4 . In the wet process, lime is made into milk of lime as an absorbent for sulfur di...
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IPC IPC(8): B01D53/50C01B17/04C01D5/04
Inventor 舒余德秦毅红杨天足
Owner CENT SOUTH UNIV