Application of sugar-mill lime sludge in wet flue gas desulfurization

A technology for filtering mud and wet desulfurization in a sugar factory is applied in the field of solid waste resource utilization, which can solve the problems of low economic benefit and complicated process, and achieve the effects of high economic and social benefits, high purity and strong adaptability.

Inactive Publication Date: 2013-04-03
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The patented non-wet limestone-gypsum method uses a solid adsorbent and requires pretreatment of the filter mud by high-temperature roasting. The process is complicated and the economic benefit is low

Method used

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  • Application of sugar-mill lime sludge in wet flue gas desulfurization
  • Application of sugar-mill lime sludge in wet flue gas desulfurization
  • Application of sugar-mill lime sludge in wet flue gas desulfurization

Examples

Experimental program
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Effect test

Embodiment 1

[0028]Desulfurize the flue gas produced by two 75 t / h circulating fluidized bed coal-fired boilers in a thermal power plant. The flue gas temperature is 135°C and the flow rate is 189,000 m 3 / h, SO 2 The concentration is 3000 mg / Nm 3 .

[0029] 1. Preparation of slurry: Mix the wet filter mud discharged from the sugar factory with 10 mass times of water and stir to make a slurry.

[0030] 2. After preparing the slurry, desulfurize the flue gas according to the conventional steps of the limestone-gypsum desulfurization process. The difference is that the desulfurization agent (that is, the absorbent) used is the slurry prepared in the above step 1, and the calcium-sulfur ratio is controlled during desulfurization. for 1-1.1.

[0031] After desulfurization treatment, SO in the flue gas 2 The concentration is 90 mg / Nm 3 , calculate the desulfurization rate: desulfurization rate = (3000?90) / 3000 × 100% = 97%.

Embodiment 2

[0033] Desulfurize the flue gas produced by two 75 t / h circulating fluidized bed coal-fired boilers in a thermal power plant. The flue gas temperature is 135°C and the flow rate is 189,000 m 3 / h, SO 2 The concentration is 5750 mg / Nm 3 .

[0034] 1. Preparation of slurry: Mix the wet filter mud discharged from the sugar factory with 12 mass times of water and stir to make a slurry.

[0035] 2. After preparing the slurry, desulfurize the flue gas according to the conventional steps of the limestone-gypsum desulfurization process. The difference is that the desulfurization agent (that is, the absorbent) used is the slurry prepared in the above step 1, and the calcium-sulfur ratio is controlled during desulfurization. for 1-1.1.

[0036] After desulfurization treatment, SO in the flue gas 2 The concentration is 200 mg / Nm 3 , calculate the desulfurization rate: desulfurization rate = (5750? 200 / 5750) × 100% = 96.5%.

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Abstract

The invention discloses the application of sugar-mill lime sludge in wet flue gas desulfurization. The application of the sugar-mill lime sludge is characterized in that the sugar-mill wet lime sludge is directly mixed with water to prepare slurry liquid, and the slurry liquid serves as an absorbing agent in a limestone-gypsum wet desulfurization method; the desulfurization absorbing agent is the waste lime sludge (namely filter residue or yellow mud) generated by the sugar prepared by a carbonic acid method in a sugar mill, mixed with water to form the slurry liquid with the proportion of 1:10-1:12, and used for absorbing sulfur dioxide (SO2) discharged by a coal burning boiler; and when the calcium-sulfur ratio is 1-1.1, the removal ratio of SO2 is up to more than 95 percent, the national desulfurization standard is met. The application of the sugar-mill lime sludge in the wet flue gas desulfurization adopts the waste residue of enterprises as the desulfuration absorbing agent, so as to be convenient and economic for material taking, simple in processing, and universal with the limestone-gypsum wet desulfurization method in requirements for equipment. The method not only saves the cost of purchasing an desulfurization agent, but also finds a way out for safe disposal of the lime sludge, so as to realize the purposes of treatment of wastes by other wastes, energy conservation and emission reduction, and have larger social environment benefits and economic benefits.

Description

technical field [0001] The invention relates to an application of sugar factory filter mud in flue gas wet desulfurization, in particular to a method for replacing limestone in wet desulfurization with sugar factory filter mud for flue gas desulfurization, and belongs to the field of flue gas wet desulfurization environmental protection technology and The technical field of solid waste resource utilization. Background technique [0002] Sugar factory filter mud (also called filter residue or yellow mud) is the waste of carbonic acid sugar production process. Because it contains more water and is light yellow, it is also called yellow mud. The main component of filter mud is calcium carbonate, but there are also a considerable proportion of organic matter and impurities. The discharge of filter mud is huge, and the stacking will also produce unpleasant odors due to the fermentation of organic matter. The resulting pollution problem has not yet found a better solution. The tr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/80B01D53/14B01D53/50
Inventor 张昭良薛俊强徐海文朱杰高于明强谷华春辛颖
Owner UNIV OF JINAN
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