Method for treating white mud produced by papermaking and use of the white mud treated by the method in removal of CO2 in tail flue gas from coal-fired boiler

A technology of papermaking white mud and treatment process, applied in sludge treatment, water/sludge/sewage treatment, energy wastewater treatment, etc., can solve problems such as low carbonation conversion rate, improve safety and economy, Easy to achieve, small investment effect

Inactive Publication Date: 2012-10-10
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the above-mentioned prior art, the present invention provides a treatment process for paper-making lime mud, which carries out multi-stage water washing filtration and solar drying treatment to paper-making white mud, which can effectively remove Na, K and Cl in the white mud, etc. Set CO 2 Elements that have adverse effects, the

Method used

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  • Method for treating white mud produced by papermaking and use of the white mud treated by the method in removal of CO2 in tail flue gas from coal-fired boiler
  • Method for treating white mud produced by papermaking and use of the white mud treated by the method in removal of CO2 in tail flue gas from coal-fired boiler
  • Method for treating white mud produced by papermaking and use of the white mud treated by the method in removal of CO2 in tail flue gas from coal-fired boiler

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Experimental program
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Effect test

Embodiment

[0025] Example The papermaking lime mud is treated, and the treated papermaking lime mud is used to measure the CO concentration in the tail flue gas of the coal-fired boiler. 2 removal of

[0026] figure 1 For the coal-fired boiler mentioned in the present invention, the papermaking lime mud is used to circulate and remove CO in the tail flue gas. 2 The process flow of the method.

[0027] The treatment methods for papermaking white mud are as follows:

[0028] Papermaking lime mud 10 and water 11 are mixed in the primary mixing tank 1, the mixing ratio is 1Kg lime mud and 4L of water, after stirring for 2-4 hours, the mixed slurry enters the primary filter 2 for filtration, and the filtered water 12 is discharged. After fully filtering, the obtained solid enters the secondary stirring tank 3 and mixes according to the ratio of 1Kg white mud to 2L water, and stirs for 2-4 hours. Then the mixed slurry enters the secondary filter 4 and is fully filtered, and the filtered wa...

experiment example

[0032] The carbonation conversion rate of untreated white mud and treated white mud (prepared in the example) of a paper mill was measured on a double fixed-bed reactor, and the carbonation conversion rate characterizes the CO captured by the absorbent. 2 ability. The absorbent is first calcined at high temperature in the calciner reactor, and the calcining atmosphere is pure N 2 , the calcination temperature is 850°C, and the calcination time is 10min; then the CaO obtained by calcination enters the carbonation reactor and CO 2 Carry out carbonation reaction, the carbonation atmosphere is 15% CO 2 and 85%N 2 , the carbonation temperature is 700°C, and the carbonation time is 40min. After calcination and carbonation, the sample was accurately weighed on a high-precision electronic balance, and the carbonation conversion rate of the absorbent was calculated according to the mass change before and after the carbonation reaction, as shown in formula (1).

[0033] ...

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Abstract

The invention discloses a method for treating white mud produced by papermaking. The method is characterized in that through multistage washing filtration and solar energy drying of white mud produced by papermaking, impurity ions such as Na, K and Cl producing adverse effects on white mud carbonation are removed and the white mud produced by papermaking and treated by the method can be used as a CO2 absorbent. A research result shows that through multistage washing filtration and solar energy drying, the CO2 cyclic-trapping performance of the white mud treated by the method is greatly improved. The method provided by the invention realizes a process route combining recycling application of white mud produced by papermaking, and removal of CO2 discharged by a coal-fired boiler. The method provided by the invention has simple and convenient processes, a small investment, a low cost and good industrial application prospects.

Description

technical field [0001] The invention relates to a treatment process of papermaking white mud, and the removal of CO in the tail flue gas of a coal-fired boiler by the treated papermaking white mud. 2 The application belongs to the field of environmental pollutant prevention and clean combustion technology. Background technique [0002] Combustion of fossil fuels such as coal, oil, and natural gas emits a large amount of CO 2 , causing a serious greenhouse effect and posing a great threat to the human living environment. How to control CO 2 Emissions have become the focus and difficulty of research by scholars from all over the world. my country uses coal as the main primary energy source to control the CO of coal-fired power stations 2 Emissions have reached a critical point. [0003] CO 2 Separation and storage technologies are considered to be the main ways to reduce carbon emissions in the short term. Researchers have proposed a variety of CO 2 Separation and capt...

Claims

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Application Information

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IPC IPC(8): C02F11/00B01D53/83B01D53/62
CPCY02C10/04Y02C20/40Y02W10/37
Inventor 李英杰孙荣岳韩奎华赵建立路春美
Owner SHANDONG UNIV
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