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Device and method for removing carbon dioxide and hydrogen sulfide from methane by water dissolving method

A carbon dioxide and hydrogen sulfide technology, applied in chemical instruments and methods, separation methods, gas fuels, etc., can solve the problems of non-recyclable water, high equipment requirements, and high cost, and achieve reduced operating costs, reduced power consumption, and low viscosity Effect

Active Publication Date: 2011-06-22
BEIJING UNIV OF CHEM TECH
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  • Abstract
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  • Application Information

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Problems solved by technology

Although the above device can also CH 4 The content is increased to close to or more than 90%, but it still has the following disadvantages: ① the pressure used is high, and the requirements for the device are high; ② water cannot be recycled, and the cost is high

Method used

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  • Device and method for removing carbon dioxide and hydrogen sulfide from methane by water dissolving method
  • Device and method for removing carbon dioxide and hydrogen sulfide from methane by water dissolving method
  • Device and method for removing carbon dioxide and hydrogen sulfide from methane by water dissolving method

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Embodiment 1

[0027] Pass the biogas into the gas buffer tank, keep the pressure in the absorption tower at 1.0Mpa through the solenoid valve, and pass it into the bottom of the absorption tower at a flow rate of 400L / h, and at the same time use a water pump to make water flow from the top of the absorption tower at a flow rate of 200L / h It enters the tower and flows in reverse with the feed gas to dissolve the carbon dioxide and hydrogen sulfide gas in it. The water dissolved in carbon dioxide and hydrogen sulfide enters the rich liquid tank from the bottom of the absorption tower, so that the pressure of the rich liquid tank rises from 0Kpa to 0.4Mpa, and the pressure of 0.4Mpa makes the water pass through the heat exchanger and the temperature drops from 30°C to 20°C before entering Regeneration tower, the pressure in the regeneration tower is reduced to normal pressure, and with 15m 3 / h flow of air is blown to regenerate, and the regenerated water flows back to the lean liquid tank fro...

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Abstract

The invention provides a method and a device for removing carbon dioxide and hydrogen sulfide from methane by a water dissolving method. In the method, according to different solubility of various ingredients of the methane in water, carbon dioxide (CO2) and hydrogen sulfide (H2S) in the methane are dissolved in tap water by controlling pressure, liquid gas ratio and temperature of an absorption tower; and the water, in which the carbon dioxide and the hydrogen sulfide are dissolved, can be recycled through regeneration. The device is simple, convenient to operate, low in investment, and convenient in industrialized production; in particular, effect of removing CO2 and H2S is obviously improved through filling design in the absorption tower and use of a redistributor; and regeneration effect of the water is improved through use of a heat exchanger. In the methane treated by the device and the method, the methane content is obviously increased; the maximum of the methane content can reach 97 to 99 percent; and a heat value is obviously increased.

Description

technical field [0001] The invention relates to a device and a method for removing carbon dioxide and hydrogen sulfide in biogas by dissolving with water, and belongs to the field of renewable energy. Background technique [0002] Biogas is a clean energy source with a wide range of raw materials. At present, in my country, biogas is mainly used for rural cooking, heating and power generation. Its main components are methane, carbon dioxide, hydrogen sulfide and some other trace components. But CO 2 and H 2 The existence of S will not only reduce the combustion calorific value of biogas, but also a large amount of acid gas will cause serious corrosion to gas storage equipment, so CO in biogas must be removed 2 and H 2 S. By separating CO 2 and H 2 S, not only can increase the methane content in the biogas to 97%-99%, the calorific value of the biogas will also be significantly improved, the performance of the gas will be more stable, and the safety of use will be signi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/18C10L3/10
Inventor 李秀金许晶肖勇朱保宁袁海荣
Owner BEIJING UNIV OF CHEM TECH
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