Method for reusing lime semi-dry desulfurization ash

A semi-dry desulfurization and desulfurization ash technology, which is applied in separation methods, chemical instruments and methods, and dispersed particle separation, can solve the problems of secondary pollution, replacement of desulfurization ash, and difficulty in utilization, so as to reduce consumption and avoid secondary pollution. The effect of reducing secondary pollution and improving the level of resource utilization

Inactive Publication Date: 2019-06-11
PANGANG GRP PANZHIHUA STEEL & VANADIUM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is that the stacking of the existing lime semi-dry desulfurization ash is easy to cause secondary pollution, the utilization is difficult, and the desulfurization ash cannot be completely replaced by the lime / limestone raw material in the lime / limestone-gypsum desulfurization process

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  • Method for reusing lime semi-dry desulfurization ash

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Comparison scheme
Effect test

Embodiment 1

[0030] Add the semi-dry desulfurization ash to the filtrate tank and prepare the filtrate to a density of 1.25×10 3 kg / m 3 The pH value of the slurry is 12.3. The slurry is transported to the desander with a pump to filter out particles larger than 45 μm and then enters the desulfurization slurry tank. Mix the circulating slurry in the spray layer, and then use the slurry pump to send the mixed slurry in the slurry tank outside the tower to the secondary spray layer of the desulfurization tower to circulate the flue gas and absorb the sulfur dioxide in the flue gas. The slurry after absorbing the sulfur dioxide is collected by the tray After returning to the slurry tank outside the tower, when the pH value of the slurry in the slurry tank outside the tower is reduced to about 6.0, discharge 1 / 4 (accounting for the proportion of the total slurry volume in the tank) slurry to the bottom of the desulfurization tower, and use the circulating slurry pump to desulfurize The slurry ...

Embodiment 2

[0035] Add the semi-dry desulfurization ash to the filtrate tank and prepare the filtrate to a density of 1.28×10 3 kg / m 3 The pH value of the slurry is 12.5. The slurry is pumped to the desander to filter out particles larger than 45 μm and then enters the desulfurization slurry tank. The frequency conversion pump is used to transport the desulfurization raw slurry to the slurry tank outside the tower. Mix the circulating slurry in the spray layer, and then use the slurry pump to send the slurry in the slurry tank outside the tower to the secondary spray layer of the desulfurization tower to circulate the flue gas and absorb the sulfur dioxide in the flue gas. The slurry after absorbing the sulfur dioxide is collected by the tray and returned The slurry tank outside the tower, when the pH value of the slurry in the slurry tank outside the tower drops to 6.1, discharge 1 / 3 of the slurry to the bottom of the desulfurization tower; use the circulating slurry pump to send the slu...

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Abstract

The invention discloses a method for reusing lime semi-dry desulfurization ash, and belongs to the technical field of resource utilization of three wastes (waste gas, waste water and industrial residue). The invention solves the problems that desulfurization ash is difficult to comprehensively utilize, and piling of the desulfurization ash easily generates secondary pollution. A filtrate obtainedby dehydrating gypsum is reused, a desulfurization ash slurry filtering device is added in the process flow, the density, pH value and the like of each desulfurization ash slurry are controlled, so that the purposes that the desulfurization ash is used to completely replace a lime / limestone raw material, spray desulfurization is carried out in a secondary spray layer and a first spray layer in a desulfurization tower to remove sulfur dioxide from flue gas are achieved. The method of the invention reduces the consumption of lime / limestone resources and the generation amount of flue gas desulfurization by-products, reduces the cost of flue gas desulfurization, avoids secondary pollution caused by stockpiling and landfill, helps to improve the resource utilization level of desulfurization products, and has extremely obvious economic benefits and social benefits.

Description

technical field [0001] The invention belongs to the technical field of utilization of steel waste resources, and in particular relates to a method for reusing lime semi-dry desulfurization ash. Background technique [0002] Lime semi-dry desulfurization ash refers to the use of quicklime (CaO) as a desulfurizer, the use of flue gas sensible heat to evaporate the water in the desulfurizer or the atomized water sprayed into the desulfurization tower, the temperature of the flue gas drops instantly and the relative humidity increases greatly, desulfurization The dry desulfurization by-products are obtained by the chemical reaction between the agent and the sulfur dioxide in the flue gas, and then the gas-solid separation of the bag filter. Lime semi-dry desulfurization ash contains a large amount of calcium sulfite, which has a slow hydration reaction and cannot harden quickly, causing slow setting in the production of cement or building materials; in addition, it has poor stab...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/80B01D53/50B01D53/96
Inventor 王睿
Owner PANGANG GRP PANZHIHUA STEEL & VANADIUM
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