a recycling no x Desulfurization and denitrification co-production calcium sulfate whisker process

A technology of calcium sulfate whisker, desulfurization and denitrification, applied in the direction of calcium/strontium/barium sulfate, nitric acid, nitrogen oxides/oxyacids, etc., can solve the problems of low by-product value, high consumption value and large investment, etc. Achieve the effect of less sulfate radicals and less direct current consumption

Active Publication Date: 2017-09-19
山西至信宝能科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] Aiming at the shortcomings of Wet-FGD+SCR combined desulfurization and denitrification, which require large investment, high operating costs, high consumption of ammonia and low value of by-products, the present invention proposes a desulfurization and denitrification co-production calcium sulfate whisker process for recovering NOx. The process design is reasonable to achieve the purpose of dust removal, simultaneous desulfurization and denitrification, recovery of NOx and production of calcium sulfate whiskers. The system has low investment, stable and reliable operation, low resource and energy consumption, and high value of by-products

Method used

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  • a recycling no <sub>x</sub> Desulfurization and denitrification co-production calcium sulfate whisker process
  • a recycling no <sub>x</sub> Desulfurization and denitrification co-production calcium sulfate whisker process
  • a recycling no <sub>x</sub> Desulfurization and denitrification co-production calcium sulfate whisker process

Examples

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Embodiment 1

[0048] figure 1 Medium desulfurization and denitrification absorption tower 1, electrolysis device 2, filter 3, filtrate tank 4, washing liquid tank 5, slurry tank 6, slurry pump 7, filtrate pump 8, washing liquid pump 9, slurry pump 10, vacuum pump 11; Lime powder A, flue gas B, recovered NOx gas C, purified flue gas D, washing process water E, gypsum whiskers F.

[0049] The flue gas B at a temperature of 150°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 can be set or not, as shown in Fig. Not shown in the figure, the slurry in the tower flows through the electrolysis device 2 outside the tower, one part flows into the feeding slurry tank 6 to make slurry with the input lime powder A, and then is sent to the desulfurization and denitrification absorption ...

Embodiment 2

[0053] 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, vacuum pump 10; lime powder A, Flue gas B, purified flue gas C, recovered NOx gas D, washing process water E, gypsum whiskers F.

[0054] The flue gas B at a temperature of 150°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 can be set or not, as shown in Fig. 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 one part is sent to the fil...

Embodiment 3

[0058] 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, vacuum pump 7, slurry pump 8, washing liquid pump 9; flue gas A, purify flue gas B, recovery of NOx gas C, washing process water D, lime powder E, gypsum whiskers F.

[0059] The flue gas A at a temperature of 150°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 E are slurried in the slurry tank 3 and then sent to the desulfurization and denitrification absorption tower 1 by the slurry pump 8, and the filtered solid phase is washed with the w...

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Abstract

The invention relates to a desulfuration, denitration and calcium sulfate whisker coproduction process for NOx recovery. The process comprises the steps of absorbing SO2 and NOx from flue gas in an absorption column by a formulated absorbent, then, recovering NOx through analysis, preparing calcium sulfite whiskers from SO2 through reaction, further preparing anhydrous calcium sulfate whiskers, and regenerating the absorption solution through electrolysis. The process has the beneficial effects that the problem of recycling of NOx is solved, and the recovery ratio is not lower than 85%; and a denitration process becomes a process for producing high-added-value products such as nitric acid and the like, direct current consumed by an electrolyzer is reduced, and the quality of the byproduct anhydrous calcium sulfate whiskers is higher.

Description

[0001] The invention belongs to the field of boiler tail gas treatment. The invention relates to a method for recovering NOx desulfurization and denitrification co-production of calcium sulfate whiskers, more specifically, absorbing SO in the flue gas with a formula absorbent in an absorption tower 2 and NOx, then NOx is recovered by parsing, SO 2 Calcium sulfite whiskers are prepared by reaction and anhydrous calcium sulfate whiskers are further prepared, and the absorption solution is regenerated by electrolysis. Background technique [0002] The current flue gas desulfurization and denitrification mainly adopts "wet-FGD" and NH 3 Selective catalytic reduction (SCR) technology denitrification". [0003] At present, there are more than 100 methods of flue gas desulfurization in the world, and there are about 20 methods used in industry. Among them, the application of wet desulfurization technology accounts for about 85% of the entire industrialized desulfurization equipmen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/78B01D53/60B01D53/96B01D47/06C01F11/46C01B21/38
CPCY02A50/20
Inventor 陶俊徐继红陶陶
Owner 山西至信宝能科技有限公司
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