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Method for treating carbonic acid method sugarhouse filter mud by using boiler flue gas

A technology for boiler flue and sugar factory filter mud, applied in waste treatment, separation methods, chemical instruments and methods, etc., can solve the problems of plant metabolic process changes, ozone layer destruction, waste of resources, etc., to fully utilize resources and protect ecology Environmental and CO2 emission reduction effects

Active Publication Date: 2014-02-19
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the flue gas discharged from the boiler contains a large amount of substances that pollute the environment. These components that pollute the environment are discharged into the atmosphere and will destroy the ozone layer, leading to the formation of acid rain, the occurrence of respiratory diseases and the change of plant metabolism.
At present, the method used by sugar enterprises to treat boiler flue gas is generally the water film dedusting method, and the water film dedusting method can only remove dust, and the treated flue gas still contains CO 2 and SO 2 and other components, where CO 2 The content is 8-18% (volume percentage), and it is directly discharged into the atmosphere, which is a waste of resources and pollutes the environment

Method used

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  • Method for treating carbonic acid method sugarhouse filter mud by using boiler flue gas
  • Method for treating carbonic acid method sugarhouse filter mud by using boiler flue gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Boiler flue gas is taken from the flue gas produced by the boiler in the sugar factory after burning coal. After dust removal, water or alkaline water washing, gas-water separation pretreatment, and then removal of solids, suspended impurities and sulfides, the main content of N 2 , CO 2 , CO and O 2 and other mixed gases, where CO 2 The content is 15-18% (volume percentage), and the gas pressure is 0.01-0.10MPa.

[0020] Take 1000kg of carbonic acid sugar filter mud (moisture mass percentage is about 65%), add 100kg of water, stir evenly, pass into the boiler flue gas until the pH of the material mixed with carbonic acid sugar filter mud and water is 7.5, and the sedimentation The upper layer solution is sprayed onto the bagasse, and the flue gas (flue gas temperature 190-200°C) after the boiler air preheater is dried and then burned in the boiler, and the solid particles in the lower layer are filtered and then buried; according to the measurement method in the inte...

Embodiment 2

[0025] Boiler flue gas is taken from the flue gas produced after burning oil in the boiler of the sugar factory. After dust removal, clean water or alkaline water washing, gas-water separation pretreatment, and then removal of solids, suspended impurities and sulfides, the main content of N 2 , CO 2 , CO and O 2 and other mixed gases, where CO 2 The content is 11-17% (volume percentage), and the gas pressure is 0.01-0.10MPa.

[0026] Take 1000kg of carbonic acid sugar filter mud (moisture mass percentage is about 55%), add 10000kg of water, stir evenly, pass through the boiler flue gas until the pH of the material mixed with carbonic sugar filter mud and water is 7.0, and the sedimentation point The upper layer solution is sprayed onto the bagasse, and the flue gas (flue gas temperature 190-210 ℃) after the boiler air preheater is dried and then burned in the boiler, and the solid particles in the lower layer are filtered and used as building materials without odor; accordin...

Embodiment 3

[0031] Boiler flue gas is taken from the flue gas produced by the boiler in the sugar factory after burning natural gas. After dust removal, clean water or alkaline water washing, and gas-water separation pretreatment, solids, suspended impurities and sulfides are removed to obtain mainly N 2 , CO 2 , CO and O 2 and other mixed gases, where CO 2 The content is 10-15% (volume percentage), and the gas pressure is 0.01-0.10MPa.

[0032] Take 1000kg of carbonic acid sugar filter mud (moisture mass percentage is about 58%), add 1000kg of water, stir evenly, pass into the boiler flue gas until the pH of the material mixed with carbonic acid sugar filter mud and water is 6.0, and the sedimentation The upper layer solution is sprayed onto the bagasse and the flue gas (flue gas temperature 160-180 ℃) after the boiler air preheater is dried and then burned in the boiler, and the solid particles in the lower layer are filtered and used as building materials without odor; according to t...

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Abstract

The invention discloses a method for treating carbonic acid method sugarhouse filter mud by using boiler flue gas. The method comprises the steps of mixing carbonic acid method sugar refining filter mud with water according to a mass ratio of 1:(0.1-1):10; then introducing boiler flue gas, controlling the pressure of the boiler flue gas to be 0.01-0.10Mpa, and controlling the pH value of the mixture to be 5.0-7.5; performing sedimentation for demixing to obtain a solution on the upper layer, and performing burning treatment to obtain solid particles on the lower layer; filtering and then embedding the solid particles or using the solid particles as a building material. According to the method disclosed by the invention, CO2 in the boiler flue gas is used to ensure that calcium carbonate is generated into calcium bicarbonate, organic impurities adsorbed by the calcium carbonate are released, organic substances are enriched in water, and solid-liquid separation facilitates resource utilization; the organic substances are dried through the flue gas and then are burnt, so that pollution can be thoroughly solved while increasing fuels; the CO2 and heat energy in the flue gas are fully used to protect the ecological environment.

Description

technical field [0001] The invention relates to a method for treating filter mud of carbonic acid sugar factory, in particular to a method for treating filter mud of carbonic acid sugar factory by using boiler flue gas, which belongs to the treatment and comprehensive utilization of carbonic sugar filter mud in the field of environmental protection technology. Background technique [0002] At present, most beet sugar factories and some cane sugar factories in the world use carbonation process to produce white granulated sugar. The advantage of this process is that the white sugar produced has high purity, low color value and storage resistance, which is significantly better than the sulfurous acid process commonly used in cane sugar factories. But it has a big disadvantage, that is, it produces a large amount of alkaline (8.0<pH<11) solid waste-filter mud (the ratio of wet filter mud to raw material is about 5-10%), and the main component of its dry solids is Has CaC...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/00B01D53/78B01D53/62
CPCY02W30/20
Inventor 于淑娟张平军扶雄黄凯胡彪
Owner SOUTH CHINA UNIV OF TECH
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