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Sugar production process using boiler flue gas as clarificant

A boiler flue and clarifying agent technology, which is applied to the purification of alkaline earth compounds, lime production, etc., can solve the problems of changes in plant metabolism, high operating costs of lime kilns, and environmental pollution, so as to achieve full utilization of resources and good environmental protection effects , the effect of protecting the ecological environment

Inactive Publication Date: 2005-08-17
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the lime kiln used in the carbonation process not only has high operating costs, but also pollutes the environment and has poor environmental protection effect.
[0004] On the other hand, the flue gas emitted by industrial boilers after burning coal, crude oil, natural gas, waste fiber and other fuels contains a large amount of harmful substances. For example, a sugar factory that squeezes 5,000 tons of sugarcane per day emits about 3 million standard cubic meters of flue gas per day. m, where CO 2 The content is about 10-15% (volume percentage), these harmful components are discharged into the atmosphere, will destroy the ozone layer, lead to the formation of acid rain, the generation of respiratory diseases and the change of plant metabolism
At present, the method of flue gas treatment in factories is generally the water film dust removal method, which can only remove dust, and the flue gas still contains CO after treatment. 2 and SO 2 and other components, and discharge them directly into the atmosphere, which wastes resources and pollutes the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The boiler flue gas is taken from the coal-fired boiler of the sugar factory, the carbon dioxide content is 15% (volume percentage), and the gas pressure is 0.01-0.10MPa. Add 0.8 g / 100 ml of calcium oxide to the sugar solution with a concentration of 53% (percentage by weight), stir evenly, pass into the boiler flue gas, react at a constant temperature of 50°C in the reactor for 45 minutes, and filter in time , collect the filtrate, and measure related indicators.

[0019] Color value before treatment: 6000IU Color value after treatment: 2300IU

[0020] Decolorization rate=(6000-2300) / 6000×100%=61.7%

[0021] Purity before treatment: 80% (percentage by weight), purity after treatment: 90% (percentage by weight)

[0022] Improve the purity difference: 90-80=10

[0023] Turbidity before treatment: 800BTU Turbidity after treatment: 50BTU

[0024] Turbidity removal rate: (800-50) / 800×100%=93.75%

Embodiment 2

[0026] The boiler flue gas is taken from the bagasse burning boiler in the sugar factory, the carbon dioxide content is 12% (volume percentage), and the gas pressure is 0.01-0.10MPa. Add 1.8 grams of calcium oxide per 100 milliliters of sugar solution to the sugar solution with a concentration of 62% (percentage by weight), stir evenly, feed boiler flue gas, and react at a constant temperature of 55° C. in the reactor for 50 minutes, and stay for 30 minutes. Minutes later, filter, collect the filtrate, and measure relevant indicators.

[0027] Color value before treatment: 8200IU Color value after treatment: 3000IU

[0028] Decolorization rate=(8200-3000) / 8000×100%=60.8%

[0029] Purity before treatment: 83.5% (percentage by weight), purity after treatment: 89% (percentage by weight)

[0030] Improve the purity difference: 89-83.5 = 5.5

[0031] Turbidity before treatment: 750BTU Turbidity after treatment: 36BTU

[0032] Turbidity removal rate: (750-36) / 750×100%=95.2%

Embodiment 3

[0034] The boiler flue gas is taken from the oil-fired boiler of the thermal power plant, the carbon dioxide content is 10.5% (volume percentage), and the gas pressure is 0.01-0.10MPa. Add 1.5 grams of calcium oxide per 100 milliliters of sugar solution to the sugar solution with a concentration of 58% by weight, stir evenly, feed boiler flue gas, and react at a constant temperature of 60°C in the reactor for 65 minutes, filter in time, collect the filtered The serum was used to determine relevant indicators.

[0035] Color value before treatment: 8899IU Color value after treatment: 3200IU

[0036] Decolorization rate=(8899-3200) / 8899×100%=64%

[0037] Purity before treatment: 89.5% (percentage by weight), purity after treatment: 92.5% (percentage by weight)

[0038] Improve the purity difference: 92.5-89.5 = 3.0

[0039] Turbidity before treatment: 920BTU Turbidity after treatment: 40BTU

[0040] Turbidity removal rate: (920-40) / 920×100%=95.7%

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PUM

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Abstract

The present invention is sugar refining process with boiler fume as the clarifier, and the sugar refining process includes the steps of extracting crude sugar liquid, purifying crude sugar liquid and producing high quality sugar. During purifying crude sugar liquid, calcium oxide or regenerated filtering mud are added, and boiler fume with CO2 content of 6-17 is introduced for reaction with calcium oxide or regenerated calcium oxide to produce calcium carbonate adsorbing non-sugar impurity in the sugar liquid, with the volume ratio between boiler fume and crude sugar liquid being 100-300, and the mass ratio between boiler fume and calcium oxide or regenerated filtering mud being 5-30. The present invention has high sugar liquid purifying effect, sugar liquid purity raised by 2-13 %, reduced lime consumption, reduced CO2 exhaust of boiler, and raised economic utility and environment utility.

Description

technical field [0001] The invention relates to an industrial sugar production method, in particular to a sugar production process using boiler flue gas as a clarifying agent. Background technique [0002] Raw syrup extracted from raw materials such as sugar beet or sugarcane contains about 20% impurities. Sugar factories use carbonation to clarify the process, that is, add lime to the raw syrup, and then pass CO2 2 As a clarifier, the CO 2 It reacts with lime to form calcium carbonate particles, and at the same time absorbs non-sugar impurities to produce high-grade sugar products. [0003] So far, the clarifying agent CO 2 It is mainly prepared by calcining limestone in a lime kiln. This reaction is an endothermic reaction, and 10% of coke is consumed to support combustion during calcining. In addition, the CO produced by calcination 2 Except for a part that is used as a clarifier, the rest are all discharged to the atmosphere, and the excess l...

Claims

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Application Information

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IPC IPC(8): C13B20/06
CPCY02P40/40
Inventor 于淑娟尚明久扶雄高文宏
Owner SOUTH CHINA UNIV OF TECH
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