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%

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0017] Example 1

[0018] The boiler flue gas is taken from a coal-fired boiler in a sugar factory, with a carbon dioxide content of 15% (volume percentage) and a gas pressure of 0.01 to 0.10 MPa. Add 0.8 g / 100 ml of calcium oxide to the sugar solution with a concentration of 53% (weight percentage). After stirring it evenly, pass it into the boiler flue gas, react at a constant temperature in the reactor at 50°C for 45 minutes, and filter in time , Collect the filtrate and determine 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 percentage), purity after treatment: 90% (weight percentage)

[0022] Improve poor purity: 90-80=10

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

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

Example Embodiment

[0025] Example 2

[0026] The boiler flue gas is taken from the bagasse-burning boiler of the sugar factory, with a carbon dioxide content of 12% (volume percentage), and a gas pressure of 0.01 to 0.10 MPa. Add 1.8 g / 100 ml of calcium oxide in the sugar solution with a concentration of 62% (weight percentage), stir it evenly, pass the boiler flue gas into the reactor, react at a constant temperature at 55°C for 50 minutes, and stay for 30 minutes. After 5 minutes, filter, collect the filtrate, and determine 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 percentage), purity after treatment: 89% (weight percentage)

[0030] Improve poor purity: 89-83.5=5.5

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

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

Example Embodiment

[0033] Example 3

[0034] The boiler flue gas is taken from an oil-fired boiler in a thermal power plant, with a carbon dioxide content of 10.5% (volume percentage), and a gas pressure of 0.01 to 0.10 MPa. Add 1.5 g / 100 ml of calcium oxide to the sugar solution with a concentration of 58% by weight. After stirring it evenly, pass it into the boiler flue gas and react in the reactor at a constant temperature of 60°C for 65 minutes. Filter in time and collect the filter. Clear liquid, 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% (weight percentage), purity after treatment: 92.5% (weight percentage)

[0038] Improve poor purity: 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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