Technology of desulphurization by regenerated ammonia with combined production of calcium sulfate whisker

A calcium sulfate whisker and process technology, applied in crystal growth, single crystal growth, single crystal growth, etc., can solve the problems of low product whiteness, uneven aspect ratio, high production cost, etc., and achieve reduced wear and high Product value, effect of reducing energy consumption

Active Publication Date: 2012-11-28
安徽览星环境科技有限公司
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  • Abstract
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Problems solved by technology

[0014] The preparation methods of these calcium sulfate whiskers use natural or by-product calcium sulfate dihydrate as raw materials, and

Method used

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  • Technology of desulphurization by regenerated ammonia with combined production of calcium sulfate whisker
  • Technology of desulphurization by regenerated ammonia with combined production of calcium sulfate whisker

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Embodiment 1

[0022] figure 1 Medium oxidation fan 1, desulfurization absorption tower 2, slurry circulation pump 3, filter 4, ammonium sulfate liquid tank 5, ammonium sulfate liquid pump 6, whisker reactor 7, mesh belt filter 8, ammonium chloride liquid tank 9, Vacuum pump 10, ammonium chloride liquid pump 11, ammonia regeneration tank 12, centrifugal filter 13, induced draft fan 14, calcium chloride liquid tank 15, calcium chloride liquid pump 16, leaf filter vacuum pump 17, washing liquid tank 18, washing liquid Pump 19; calcium carbide mud A, desulfurization slag B, oxidizing air C, flue gas D, purified flue gas E, steam F, condensed water G, gypsum whiskers H, and sludge I.

[0023] The flow rate is 600000Nm 3 / h, the flue gas D with a temperature of 150°C enters the middle part of the desulfurization absorption tower 1, and is in countercurrent contact with the circulating slurry sprayed from the upper part. The slurry in the tower is circulated by the slurry circulating pump 3, and ...

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Abstract

A technology of desulphurization by regenerated ammonia with combined production of calcium sulfate whisker. specifically, calcium carbide slurry is used as a raw material to react with ammonium chloride (or ammonium nitrate) to generate calcium chloride (or calcium nitrate) and simultaneously regenerate ammonia for desulphurization; and after the desulphurization product ammonium sulfite is oxidated to be ammonium sulfate, the ammonium sulfate is reacted with the calcium chloride (or calcium nitrate) to prepare calcium sulfate whisker, wherein the ammonium chloride (or ammonium nitrate) generated by the ammonium sulfate and the calcium chloride ( or calcium nitrate) is recycled. The technology is advantageous in that: (1) the desulfurization rate is more than 95%, and the absorbent ammonia is obtained by regeneration; (2) the regeneration reaction is relatively complete, with the conversion rate of the calcium carbide slurry being more than 95%; (3) the loss of the ammonia is reduced by more than 10%; (4) the desulphurization energy consumption is reduce by more than 10%; (5) the investment on desulphurization equipment is decreased by more than 20%, and the investment on whisker production equipment is decreased by more than 20%; and (6) the obtained calcium sulfate whisker has a high length-diameter ratio which reaches 50-200, high whiteness which reaches 90%, and high purity which reaches 99%.

Description

technical field [0001] The invention belongs to the field of boiler tail gas treatment and new materials. The invention relates to a method for removing sulfur dioxide and producing calcium sulfate whiskers. More specifically, it is a method of using calcium carbide mud as a raw material, regenerating ammonia for desulfurization, and changing ammonium sulfate, a by-product of ammonia desulfurization, into calcium sulfate whiskers. Background technique [0002] More than 90% of my country's energy structure uses coal as power, and burning coal will produce SO 2 , among which the power plant emissions are the largest, by SO 2 The acid rain pollution damage area mainly caused by acid rain has accounted for about 40% of the country's land area, and the economic loss caused by it has reached hundreds of billions of yuan every year in the country. [0003] At present, there are more than 100 methods of flue gas desulfurization in the world, and there are about 20 methods used in...

Claims

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Application Information

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IPC IPC(8): B01D53/79B01D53/50C30B7/14C30B29/22C30B29/62
Inventor 陶俊徐继红
Owner 安徽览星环境科技有限公司
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