Method for producing calcium carbonate during marsh gas purification

A technology of calcium carbonate and biogas, applied in the fields of calcium carbonate/strontium/barium, gas fuel, petroleum industry, etc., can solve the problem of strong corrosion of equipment, and achieve the effect of improving purity and quality, high economic benefit and simple operation

Inactive Publication Date: 2012-03-21
王嘉兴
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Hydrogen sulfide is a gas with the smell of rotten eggs, which is a strong nerve poison. The combustion of hydrogen sulfide produces sulfur dioxide or sulfur trioxide, which is highly corrosive to equipment.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] A method for purifying by-product calcium carbonate from biogas includes the following specific steps:

[0014] Step A: Configure calcium hydroxide solution, which contains 74kg of pure calcium hydroxide, put it into the reactor, and pass biogas into the calcium hydroxide solution from the bottom of the reactor, and the biogas flow rate is controlled at 220m 3 / h, the pressure in the reactor is controlled at 1.5MPa, where the mass ratio of the carbon dioxide and the pure substance of calcium hydroxide participating in the reaction is 1:1.68, the reaction produces calcium carbonate and calcium sulfide, and a mixed solution containing calcium carbonate and calcium sulfide is obtained , And purified biogas, output from the top of the reactor;

[0015] Step B: Filter the mixed solution containing calcium carbonate and calcium sulfide obtained in Step A through a filter to obtain a white calcium carbonate and calcium sulfide filter cake and filtrate. The calcium sulfide content in...

Embodiment 2

[0018] A method for purifying by-product calcium carbonate from biogas includes the following specific steps:

[0019] Step A: Configure calcium hydroxide solution, which contains 74kg of pure calcium hydroxide, put it into the reactor, and pass biogas into the calcium hydroxide solution from the bottom of the reactor, and the biogas flow rate is controlled at 240m 3 / h, the pressure in the reactor is controlled at 1.8MPa, where the mass ratio of carbon dioxide and calcium hydroxide pure substance participating in the reaction is 1:1.88, and the reaction produces calcium carbonate and calcium sulfide to obtain a mixed solution containing calcium carbonate and calcium sulfide , And purified biogas, output from the top of the reactor;

[0020] Step B: Filter the mixed solution containing calcium carbonate and calcium sulfide obtained in Step A through a filter to obtain a white calcium carbonate and calcium sulfide filter cake and filtrate. The calcium sulfide content in the filter ca...

Embodiment 3

[0023] A method for purifying by-product calcium carbonate from biogas includes the following specific steps:

[0024] Step A: Configure calcium hydroxide solution, which contains 74kg of pure calcium hydroxide, put it into the reactor, and pass biogas into the calcium hydroxide solution from the bottom of the reactor, and the biogas flow rate is controlled at 240m 3 / h, the pressure in the reactor is controlled at 1.2MPa, where the mass ratio of carbon dioxide and calcium hydroxide pure substance participating in the reaction is 1:1.48, and the reaction produces calcium carbonate and calcium sulfide to obtain a mixed solution containing calcium carbonate and calcium sulfide , And purified biogas, output from the top of the reactor;

[0025] Step B: Filter the mixed solution containing calcium carbonate and calcium sulfide obtained in Step A through a filter to obtain a white calcium carbonate and calcium sulfide filter cake and filtrate. The calcium sulfide content in the filter ca...

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PUM

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Abstract

The invention provides a method for producing calcium carbonate during marsh gas purification. The method comprises the following steps of: introducing marsh gas into a calcium hydroxide solution at the flow speed 200-240 m<3>/h; controlling the reaction pressure at 1.2-1.8 MPa; reacting to generate calcium carbonate and calcium sulfide; filtering to obtain calcium carbonate and calcium sulfide filter cakes and filtrates; and washing the filtrates, drying and smashing to obtain a calcium carbonate product. The filtrates can be recycled by replenishing calcium hydroxide. The method is easy to operate, and is convenient to popularize and apply; and moreover, by adopting the method, carbon dioxide and hydrogen sulfide impurities contained in marsh gas are absorbed effectively, the purity and quality of the marsh gas are improved, waste is changed into valuable, a calcium carbonate product with high economic benefit is obtained, and the potential economic value of marsh gas is developed effectively.

Description

Technical field [0001] The invention relates to the technical field of biogas purification, in particular, to a method for purifying by-product calcium carbonate from biogas. Background technique [0002] At present, biogas digesters have been widely used in rural my country, and the use of biogas for cooking and lighting has become quite common. On the one hand, it has improved the living conditions of farmers, on the other hand, it has also reduced living expenses and comprehensively utilizes energy. However, because the original biogas only contains 60-65% of combustible components, the remaining components are mainly carbon dioxide, and also contain a small amount of hydrogen sulfide and water vapor. Among them, the content of carbon dioxide is about 35-40%, which reduces the combustible value or energy value of biogas. The hydrogen sulfide gas with the smell of rotten eggs is a strong nerve poison. The combustion of hydrogen sulfide produces sulfur dioxide or sulfur trioxi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L3/10C01F11/18
Inventor 王嘉兴
Owner 王嘉兴
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