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Sugar production process using boiler flue gas as clarificant

A boiler flue and clarifying agent technology, applied in the direction of using alkaline earth compounds for purification, lime production, etc., can solve problems such as changes in plant metabolism, high operating costs of lime kilns, destruction of ozone layer, etc., to achieve full utilization of resources, good environmental protection effects, The effect of protecting the ecological environment

Inactive Publication Date: 2009-06-03
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. The calcium oxide of 0.8g / 100ml of sugar solution was added to the sugar solution with a concentration of 53% (weight percent), and after stirring, the boiler flue gas was introduced, and the reaction was performed at a constant temperature for 45 minutes at 50°C in the reactor, and filtered in time. , collect the filtrate, and measure the relevant 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% (weight percent), purity after treatment: 90% (weight percent)

[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 of the sugar factory, the carbon dioxide content is 12% (volume percentage), and the gas pressure is 0.01-0.10MPa. Add the calcium oxide of 1.8 g / 100 milliliters of sugar liquid to the sugar liquid with a concentration of 62% (weight percent), after stirring, pass into the boiler flue gas, and react at a constant temperature for 50 minutes at 55 ° C in the reactor, and stay for 30 minutes. After 1 minute, filter, collect the filtrate, and measure the 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% (weight percent), purity after treatment: 89% (weight percent)

[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. The calcium oxide of 1.5 g / 100 ml of sugar solution was added to the sugar solution with a concentration of 58% by weight, and after stirring evenly, the boiler flue gas was introduced, and the reaction was carried out at a constant temperature of 60 ° C in the reactor for 65 minutes, filtered in time, and the filtered solution was collected. Serum, and measure 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% (weight percent), purity after treatment: 92.5% (weight percent)

[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) / 92...

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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 industrialized sugar-making method, in particular to a sugar-making process using boiler flue gas as a clarifying agent. Background technique [0002] The crude syrup extracted from raw materials such as sugar beet or sugar cane contains about 20% impurities. The sugar factory uses the carbonation clarification process, that is, adding lime to the crude syrup, and then passing CO 2 As a clarifying agent, making CO 2 It reacts with lime to form calcium carbonate particles, and at the same time absorbs non-sugar impurities to produce high-quality sugar products. [0003] So far, the clarifying agent CO of the carbonation process 2 It is mainly prepared by calcining limestone in a lime kiln. The reaction is an endothermic reaction, and 10% of coke is consumed during calcination to support combustion. In addition, calcined CO 2 Except for a part that is used as a clarifying agent, the rest are all discharged to the atmospher...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C13D3/06C13B20/06
CPCY02P40/40
Inventor 于淑娟尚明久扶雄高文宏
Owner SOUTH CHINA UNIV OF TECH
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