由于沼氣中含有大量的硫化物和水蒸氣，直接燃燒利用的話，對燃燒設(shè)備可能會造成極大的損害，為了避免這種情況，我們一般都會進行沼氣提純，而變壓吸附法就是比較常用的一種方法。下面小編就給大家介紹一下沼氣提純用到的變壓吸附法的優(yōu)缺點！
Because biogas contains a lot of sulfides and water vapor, direct combustion may cause great damage to combustion equipment. In order to avoid this situation, we usually purify biogas, and pressure swing adsorption is a commonly used method. Next, we will introduce the advantages and disadvantages of pressure swing adsorption used in biogas purification.
變壓吸附提純法是利用吸附劑（如分子篩等）對二氧化碳的選擇性吸附特點, 即在吸附劑上二氧化碳相對其他氣態(tài)組分有較高的分離系數(shù), 來達到對沼氣中二氧化碳進行脫除的目的。在吸附過程中，原料氣在加壓條件下其中的二氧化碳被吸附在吸附塔內(nèi)，甲烷等其他弱吸附性氣體作為凈化氣排出，當吸附飽和后將吸附柱減壓甚至抽成真空使被吸附的二氧化碳釋放出來。為了保證對氣體的連續(xù)處理要求，變壓吸附法至少需要兩個吸附塔, 也可是三塔、四塔或更多。
Pressure swing adsorption (PSA) is a method to remove carbon dioxide from biogas by utilizing the selective adsorption characteristics of adsorbents (such as molecular sieves), i.e. the separation coefficient of carbon dioxide on adsorbents is higher than that of other gaseous components. During the adsorption process, carbon dioxide in the feed gas is adsorbed in the adsorption tower under pressurized conditions, and other weakly adsorbed gases such as methane are discharged as purifying gas. When the adsorption is saturated, the adsorption column is decompressed or even pumped into vacuum to release the adsorbed carbon dioxide. In order to ensure the continuous treatment of gases, PSA requires at least two adsorption towers, or three, four or more towers.
工藝優(yōu)點：目前新開發(fā)的主副塔結(jié)構(gòu)式變壓吸附脫碳裝置，改變了傳統(tǒng)變壓吸附甲烷回收率低、凈化度低等問題。整個裝置操作簡便，維修量少，同時克服了化學脫碳的起泡、易腐蝕、耗蒸汽等缺點。
Advantages of the process: The newly developed PSA decarbonization device with main and auxiliary towers has changed the problems of low recovery and low purity of traditional PSA methane. The whole device is easy to operate and has less maintenance. At the same time, it overcomes the shortcomings of chemical decarbonization, such as foaming, corrosion and steam consumption.
工藝缺點：在實際工程運行中，變壓吸附中的分子篩易中毒、失去活性，分子篩在變壓吸附中所占成本比例較高。
Technological shortcomings: In practical engineering operation, molecular sieves in pressure swing adsorption are easily poisoned and deactivated, and the cost proportion of molecular sieves in pressure swing adsorption is relatively high.
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2019-08-28
