Paddy hull burned gas and waste residue comprehensive utilization method

A technology for burning waste gas and rice husks, applied in the direction of silica, organic fertilizers, silicon oxide, etc., can solve the problems of polluting the environment, low utilization rate of combustion heat, and economic uneconomical, etc., and achieve the effect of reducing costs

Inactive Publication Date: 2009-04-29
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, there are three problems in the promotion and application of the project: one is that the utilization rate of combustion heat is low, the cost is high, and it is not economical; the other is that the combustion produces a lot of tar, which not only wastes resources but also pollutes the environment; Damage equipment and pollute the environment
[0007] Among the above patents, some patents use rice husk ash to prepare water glass and silica, use the silicon source in r

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Recovery and purification of rice husk combustion and combustion tail gas

[0028] The rice husk is burned to obtain rice husk ash and combustion tail gas. The combustion tail gas first enters the heat exchanger for indirect drying of the finished activated carbon, then enters the inertial dust collector and the cyclone dust collector to remove the coarse dust, then enters the spray dust collector and the sieve plate dust collector to remove the fine dust, and finally enters the compression section.

[0029] (2) Pretreatment of rice husk ash

[0030] After dispersing the rice husk ash with water, neutralize it with 3% sulfuric acid to pH=7, dissolve soluble oxides and other impurities therein, and filter. The filtrate is used as plant ash fertilizer, and the filter residue is used for later use.

[0031] (3) Catalytic hydrolysis of rice husk ash

[0032] Put the filter residue in step (2) and 20wt% sodium carbonate aqueous solution into the reactor at a solid-to-...

Embodiment 2

[0038] (1) Recovery and purification of rice husk combustion and combustion tail gas

[0039] The rice husk is burned to obtain rice husk ash and combustion tail gas. The combustion tail gas first enters the heat exchanger for indirect drying of the finished activated carbon, then enters the inertial dust collector and the cyclone dust collector to remove the coarse dust, then enters the spray dust collector and the sieve plate dust collector to remove the fine dust, and finally enters the compression section.

[0040] (2) Pretreatment of rice husk ash

[0041] After dispersing the rice husk ash with water, neutralize it with 1-10% hydrochloric acid to pH = 7, dissolve soluble oxides and other impurities therein, and filter. The filtrate is used as plant ash fertilizer, and the filter residue is used for later use.

[0042] (3) Catalytic hydrolysis of rice husk ash

[0043]Put the filter residue in (2) and 20wt% potassium carbonate aqueous solution into the reactor at a sol...

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PUM

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Abstract

The invention discloses a comprehensive utilization method for rice hull combustion emissions and waste residue, in particular a method for preparing superfine silicon dioxide and active carbon with high specific surface area by using the emissions and waste residue generated by the pyrolysis and combustion of the rice hull, which comprises the following steps: the main raw material sodium carbonate (or potassium carbonate) is heated and hydrolyzed to be sodium bicarbonate (or potassium bicarbonate), OH<-> is released, the silicon dioxide in the rice hull ashes is dissolved, the sodium bicarbonate (or the potassium bicarbonate) is reduced to sodium carbonate (or potassium carbonate) after temperature reduction, and then the silicon dioxide precipitate is separated out. The method has the advantages that the silicon dioxide which only plays the role of catalyst in the process can be used circularly without consumption, the cost is reduced; the purified combusted tail gas can be used for preparing a precipitator of the silicon dioxide, thus avoiding the pollution brought by acid neutralization and precipitation in the traditional technology, reducing the cost, making full use of carbon dioxide and reducing green house gas emission; and the activating agent for preparing the active carbon can be recovered, which can be returned to the hydrolyzation process to be reused after adjusting the concentration of the sodium carbonate (or the potassium carbonate), thus reducing the cost.

Description

technical field [0001] The invention relates to a new method for comprehensive utilization of rice husk combustion exhaust gas and waste residue, in particular to a method of using rice husk to produce high-purity rice husk ash obtained through direct combustion for heat supply or pyrolysis for power generation. New approach to nano-silica and ultra-high surface area activated carbon. Background technique [0002] With the rapid development of global industrialization, the consumption of disposable energy continues to increase, causing energy depletion and environmental pollution. The negative impact of these problems is increasing. Human beings are constantly looking for new energy for their own survival and development. , to reduce and replace the consumption of primary energy. Among all kinds of renewable energy, biomass is the only renewable carbon source for storing solar energy, and it is an important part of sustainable renewable energy. The research and development...

Claims

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Application Information

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IPC IPC(8): C01B31/08C05F11/02C01B33/12
Inventor 王子忱安冬敏郭玉鹏赵旭丁雪峰周兵
Owner JILIN UNIV
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