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沼氣脫碳法如何做好沼氣的處理

由于沼氣中甲烷含量較低,其高位發(fā)熱值只有23.9MJ/m?(甲烷含量60%),而純甲烷高位發(fā)熱值為39.78MJ/m?。作為車(chē)用燃料或者管道天然氣燃料其高位發(fā)熱值要求大于31.4MJ/m?,則要求沼氣中甲烷濃度至少提高到88%以上,即要脫除多余CO2。沼氣脫碳技術(shù)多源于天然氣、合成氨變換氣脫碳技術(shù),包括物理溶液吸收法、化學(xué)吸收法、變壓吸附法、膜分離法、低溫深冷法等。

Due to the low methane content in biogas, its high calorific value is only 23.9 MJ/m? The methane content is 60%, while the high calorific value of pure methane is 39.78MJ/m?. As a vehicle fuel or pipeline natural gas fuel, its high heating value is required to be greater than 31.4MJ/m?, It is required that the methane concentration in biogas be increased to at least 88% or above, that is, excess CO2 must be removed. Biogas decarbonization technology mostly originates from natural gas and synthetic ammonia conversion gas decarbonization technology, including physical solution absorption method, chemical absorption method, pressure swing adsorption method, membrane separation method, low-temperature cryogenic method, etc.

(1)加壓水洗法

(1) Pressurized water washing method

提純效率高(>97% CH4),甲烷損失小(<2%);當(dāng)H2S<300ppm可同時(shí)去除;易操作,溶劑易再生,耐受一定的雜質(zhì);通過(guò)改變壓力和溫度可調(diào)整處理能力。

High purification efficiency (>97% CH4), low methane loss (<2%); When H2S<300ppm, it can be removed simultaneously; Easy to operate, solvent easy to regenerate, resistant to certain impurities; The processing capacity can be adjusted by changing the pressure and temperature.

(2)碳酸丙烯酯法

(2) Propylene carbonate method

02

提純效率高(>97% CH4),吸收能力大,相比水洗法更節(jié)能。溶劑可再生;可同時(shí)去除H2S、有機(jī)硫化物和水。

High purification efficiency (>97% CH4), large absorption capacity, and more energy-saving compared to water washing method. Renewable solvents; It can simultaneously remove H2S, organic sulfides, and water.

(3)聚乙二醇法

(3) Polyethylene glycol method

提純效率高(>97% CH4),吸收能力大,甲烷損失?。豢赏瑫r(shí)去除H2S、有機(jī)硫和水;相比水洗法更節(jié)能,溶劑可再生、揮發(fā)性小。

High purification efficiency (>97% CH4), large absorption capacity, and low methane loss; Can simultaneously remove H2S, organic sulfur, and water; Compared to water washing method, it is more energy-efficient, with renewable solvents and less volatility.

(4)醇胺法

(4) Alcoholic amine method

提純效率高(>97% CH4),吸收能力大,甲烷損失小(<0.1%);溶劑可再生、操作成本低。

High purification efficiency (>97% CH4), large absorption capacity, and small methane loss (<0.1%); Renewable solvents with low operating costs.

(5)膜分離法

(5) Membrane separation method

可靠,操作簡(jiǎn)單;同時(shí)去除H2S和水;處理量小時(shí)不增加單位成本;氣/氣去 除效率:<92% CH4(一步)或者>96%;CH4氣/液 去除效率:>96% CH4,可得到純CO2。

Reliable and easy to operate; Simultaneously removing H2S and water; No increase in unit cost per hour of processing capacity; Gas/gas removal efficiency:<92% CH4 (one step) or>96%; CH4 gas/liquid removal efficiency:>96% CH4, pure CO2 can be obtained.

(6)變壓吸附法

(6) Pressure swing adsorption method

提純效率高(95%~98% CH4);能耗低;高壓但可回收;同時(shí)去除O2和N2,耐受一定的雜質(zhì),也適合低處理量。

High purification efficiency (95%~98% CH4); Low energy consumption; High pressure but recyclable; Simultaneously removing O2 and N2, tolerating certain impurities, and also suitable for low processing capacity.

(7)低溫分離法

(7) Low temperature separation method

提純效率高(90%~98% CH4);易得到液化生物甲烷。

High purification efficiency (90%~98% CH4); Easy to obtain liquefied biomethane.

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