Landfill gas separating and purifying process and device

A landfill gas and process technology, which is applied in separation methods, dispersed particle separation, absorption purification/separation, etc., can solve problems such as inability to obtain high purity, and achieve the effects of reducing emissions, facilitating utilization, and improving purity

Inactive Publication Date: 2014-12-10
SUZHOU SUJING PROTECTIVE ATMOSPHERE
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  • Application Information

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Problems solved by technology

The patent No. ZL200910085020.2 is an invention patent, which performs desulfurization of landfill gas, one-stage pressure swing adsorption, temperature swing adsorption, and two-stage pressure swing adsorption to produce methane, but cannot obtain high-purity CO 2

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  • Landfill gas separating and purifying process and device
  • Landfill gas separating and purifying process and device

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Embodiment 1

[0027] Embodiment one: see attached figure 1 As shown, a process for realizing the separation and purification of landfill gas includes the following steps: firstly, the landfill gas is separated into methane-rich gas and carbon dioxide-absorbed solution by using methyldiethanolamine method (MDEA); Then, the methane-rich gas is dehydrated and separated by pressure swing adsorption to obtain methane product gas; the solution that absorbs carbon dioxide is flashed to release the gas containing carbon dioxide, and the gas containing carbon dioxide is dehydrated and then subjected to pressure swing adsorption And separation obtains carbon dioxide product gas.

[0028] The above separation and purification process is carried out through the attached figure 2 The separation and purification device shown is realized. In this figure, the wider lines represent the passages of liquids, while the narrower lines represent the passages of gases. The landfill gas separation and purificat...

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Abstract

The invention relates to a landfill gas separating and purifying process which comprises the following steps: separating landfill gas by adopting a methyldiethanolamine method; performing dehydration and pressure swing adsorption on a gas obtained by separation to obtain methane product gas; and performing flash evaporation and dehydration on a solution obtained by separation and then performing pressure swing adsorption to obtain carbon dioxide product gas. A landfill gas separating and purifying device comprises an absorption tower filled with methyldiethanolamine solution, a methane dehydrating device, a methane pressure swing adsorption device, a flash evaporation tower, a carbon dioxide dehydrating device and a carbon dioxide pressure swing adsorption device; a gas inlet of the absorption tower is connected with a raw material gas source, a gas outlet in the upper section of the absorption tower is sequentially connected with the methane dehydrating device and the methane pressure swing adsorption device; a solution outlet in the lower section of the absorption tower is sequentially connected with the flash evaporation tower, the carbon dioxide dehydrating device and the carbon dioxide pressure swing adsorption device. The process and the device disclosed by the invention can be used for simultaneously recovering carbon dioxide and methane from landfill gas, thereby reducing the emission of greenhouse gases and improving the purity of the gases.

Description

technical field [0001] The invention relates to a process and a device for separating and purifying landfill gas to obtain methane gas and carbon dioxide gas with high purity for easy utilization. Background technique [0002] Today in the 21st century, human beings are facing two serious environmental challenges, one is waste management, and the other is the aggravation of the greenhouse effect. [0003] Common domestic waste disposal methods are: (1) sanitary landfill; (2) composting; (3) incineration. Among them, sanitary landfill is the main way to deal with municipal solid waste. At present, more than 80% of domestic waste in my country is disposed of in sanitary landfill. Landfill gas produced by landfills consists of carbon dioxide, methane, nitrogen, oxygen, ammonia, hydrogen sulfide, and other organic gases. The landfill gas is a potential clean energy, and its calorific value is generally 7450~22350KJ / m 3 , dehydration to remove CO 2 After the impurity compone...

Claims

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Application Information

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IPC IPC(8): B01D53/00B01D53/047B01D53/14C01B31/20C07C7/11C07C7/12C07C9/04C01B32/50
CPCY02C20/20Y02C20/40Y02E50/30Y02P20/151
Inventor 郗春满朱云华李辉郭正军
Owner SUZHOU SUJING PROTECTIVE ATMOSPHERE
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