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Process for simultaneously desulfurizing and denitrifying to coproduce calcium sulfate whisker

A calcium sulfate whisker, desulfurization and denitrification technology, applied in crystal growth, single crystal growth, single crystal growth, etc., can solve the problems of high operating costs, low value of by-products, low system investment, resource and energy consumption, etc.

Active Publication Date: 2014-07-09
淮南市明月环保科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the shortcomings of Wet-FGD+SCR combined desulfurization and denitrification, which require large investment, high operating costs, high ammonia consumption and low value of by-products, the present invention proposes a simultaneous desulfurization and denitrification co-production calcium sulfate whisker process, the process design Reasonable, to achieve the purpose of dust removal, simultaneous desulfurization and denitrification and calcium sulfate whisker production, low system investment, stable and reliable operation, low resource and energy consumption, and high value of by-products

Method used

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  • Process for simultaneously desulfurizing and denitrifying to coproduce calcium sulfate whisker
  • Process for simultaneously desulfurizing and denitrifying to coproduce calcium sulfate whisker
  • Process for simultaneously desulfurizing and denitrifying to coproduce calcium sulfate whisker

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Experimental program
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Effect test

Embodiment 1

[0035] figure 1 Medium desulfurization and denitrification absorption tower 1, slurry tank 2, filter 3, filtrate tank 4, washing liquid tank 5, slurry pump 6, slurry pump 7, filtrate pump 8, washing liquid pump 9, tower electrolysis device 10; lime Powder A, flue gas B, purified flue gas C, washing process water D, gypsum whiskers E.

[0036] The flue gas B at a temperature of 110°C enters the middle part of the desulfurization and denitrification absorption tower 1, and is in countercurrent contact with the circulating slurry, feed slurry, filtrate and washing process water sprayed from the upper part. The circulation of the slurry in the tower is not shown in the figure. The slurry in the tower is output by the slurry pump 6, one part is sent to the slurry tank 2 to make slurry with the input lime powder A, and then sent to the desulfurization and denitrification absorption tower 1 by the slurry pump 7, and the other part is sent to the filter 3, and the filtrate is collecte...

Embodiment 2

[0040] figure 2 Medium desulfurization and denitrification absorption tower 1, slurry tank 2, filter 3, filtrate tank 4, washing liquid tank 5, slurry pump 6, slurry pump 7, filtrate pump 8, washing liquid pump 9, external electrolysis device 10; lime Powder A, flue gas B, purified flue gas C, washing process water D, gypsum whiskers E.

[0041] The flue gas B at a temperature of 110°C enters the middle part of the desulfurization and denitrification absorption tower 1, and is in countercurrent contact with the circulating slurry, feed slurry, filtrate and washing process water sprayed from the upper part. The circulation of the slurry in the tower is not shown in the figure. The slurry in the tower flows through the electrolysis device 10 outside the tower, one part flows into the feeding slurry tank 2 to make slurry with the input lime powder A, and then is sent to the desulfurization and denitrification absorption tower 1 by the slurry pump 7, and the other part is output ...

Embodiment 3

[0045] image 3 Medium desulfurization and denitrification absorption tower 1, filter 2, slurry tank 3, washing liquid tank 4, slurry pump 5, circulating slurry pump 6, slurry pump 7, washing liquid pump 8, tower electrolysis device 9; flue gas A, Purify flue gas B, wash process water C, lime powder D, gypsum whiskers E.

[0046] The flue gas A at a temperature of 110°C enters the middle part of the desulfurization and denitrification absorption tower 1, and is in countercurrent contact with the circulating slurry, feed slurry and washing process water sprayed from the upper part. Most of the slurry in the tower is circulated by the circulating slurry pump 6, and a small part The output of the slurry pump 5 is sent to the filter 2 for filtration, the filtrate and the input lime powder D are made into slurry in the slurry tank 3, and then sent to the desulfurization and denitrification absorption tower 1 by the slurry pump 7, and the filtered solid phase is washed with the wash...

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Abstract

The invention discloses a process for simultaneously desulfurizing and denitrifying to coproduce a calcium sulfate whisker. The method comprises the following steps: absorbing SO2 and NOx in smoke by using a formula absorbent in an absorption tower, and then electrolyzing absorption liquid, so that N2 and sulfate radical are generated by NOx and SO2 respectively to be removed and the calcium sulfate whisker is coproduced. The process has the beneficial effects that (1) desulfurizing and denitrifying are integrated, the process is small in equipment investment, less in power consumption and low in operation cost, ammonia is not consumed in the denitrifying process, and a catalyst is not used; (2) an oxidation air blower is not arranged, so that energy consumption is greatly reduced, and the moisture content of a by-product can be up to no more than 3%; (3) the draw ratio of the by-product calcium sulfate whisker is greater than or equal to 50, and the calcium sulfate whisker has high product value; (4) the process is less in moisture consumption, the slurry prepared from lime is good in suspension property, and entrainment is reduced; (5) the absorbent is improved, so that the desulfurization rate is greater than or equal to 95%, the denitration rate is greater than or equal to 90%, and the prepared whisker is long in draw ratio; (6) the process is less in direct current consumed by electrolysis, the flue gas treatment process is a production process, and a value creation process is realized.

Description

[0001] The invention belongs to the field of boiler tail gas treatment. The invention relates to a method for removing SO in flue gas 2 The method of co-producing calcium sulfate whiskers in parallel with the method of NOx, more specifically, is to absorb SO in the flue gas in the absorption tower with a formula absorbent 2 and NOx, and then electrolyze the absorption solution to make NOx generate N 2 and SO 2 A method for producing sulfate radical removal and promoting crystal transformation to produce calcium sulfate whiskers. Background technique [0002] The current flue gas desulfurization and denitrification mainly adopts "wet-FGD" and NH 3 Selective catalytic reduction (SCR) technology denitrification". [0003] Flue gas desulfurization can be traced back at least to the 1930s. There are many types of desulfurization technologies, but only a dozen are widely used in domestic and foreign industries. Among them, ammonia desulfurization is second only to lime / gypsum me...

Claims

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Application Information

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IPC IPC(8): B01D53/78B01D53/60C30B29/62C30B29/46
CPCY02A50/20
Inventor 陶俊陶陶万敏徐继红
Owner 淮南市明月环保科技有限责任公司
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