Method for landfill of gas fluidification dimethyl ether fuel by garbage

A technology for landfill gas and liquefaction of dimethyl ether, which is applied in the fields of isomerization to prepare ether, ether preparation, hydrogen production, etc., can solve the problems such as the dimethyl ether process that has been reported, and achieves short process flow and thermal energy utilization. The effect of high rate and simple product separation process

Active Publication Date: 2008-02-27
中科合肥煤气化技术有限公司
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Problems solved by technology

[0007] The existing one-step synthesis of dimethyl ether is generally based on coal or natural gas, and there is no report on the process of producing dimethyl ether from landfill gas.

Method used

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  • Method for landfill of gas fluidification dimethyl ether fuel by garbage

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Embodiment Construction

[0029] Preparation of syngas:

[0030] As shown in Figure 1, feed the preheated raw material gas into a high-temperature furnace at 700-800°C, and react through a fixed bed of catalyst at 0.1 atmospheric pressure (atm). According to the performance of the catalyst, The air velocity of raw material gas is controlled at 5000-20000h -1 . The equipment related to the reforming reaction mainly includes high-temperature furnace 3, burner 6 and heat exchanger E1-E5, and the flow rate of dilution air can be controlled by frequency conversion blower 9, thereby controlling and regulating flue gas and the temperature of reaction bed 4. Fuel gas is composed of crude desulfurized landfill gas , tail gas from the DME synthesis stage and premixed air . Mixing and preheating, the burner 6 is a porous media burner. The flue gas is a high-temperature gas after fuel combustion, which is mixed with dilution air and used as a heat source for a high-temperature furnace. Raw gas and flue g...

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Abstract

The invention discloses a preparing method of dimethyl ether, which comprises the following steps: choosing garbage embedding gas as initial raw material; choosing methane and CO2 as main chemical element; setting near volume fraction; proceeding catalytic reforming reaction; generating synthetic gas with hydrogen-carbon ratio near 1; setting the upstream synthetic gas enriched with CO as raw material; synthesizing dimethyl ether in slurry state bed reactor; using the garbage embedding gas as main energy; providing heat energy for system; using the rear gas as fuel; providing heat for the system; adopting deep cooled method; condensing the dimethyl ether to liquid; separating from the synthetic gas; getting the cooled energy from absorption refrigerating machine group. This invention provides a new approach for garbage treating site to utilize embedding gas, which can transferring the waste source to clean energy.

Description

technical field [0001] The invention relates to a method for comprehensive utilization of landfill gas, in particular to a method for producing liquefied dimethyl ether fuel from landfill gas. Background technique [0002] Landfill gas (referred to as landfill gas) is the gas collected during the sanitary landfill operation of municipal solid waste, which is mainly produced by anaerobic fermentation of biomass in the waste. Typical landfill gas contains more than 90 volume percent methane and CO in total 2 , and the contents of the two are relatively close, and the rest are N 2 and other impurity gases. Landfill gas is a renewable resource with a considerable amount. According to statistics, every kilogram of municipal solid waste can produce 0.064 to 0.44 cubic meters of landfill gas, and the annual municipal solid waste in the country will generate tens of billions of cubic meters of landfill gas. Embarrassed. [0003] Dimethyl ether (Dimethylether, referred to as DME)...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C43/04C07C41/01C07C41/32C01B3/02
Inventor 梁世强刘石马人熊李志宏
Owner 中科合肥煤气化技术有限公司
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