沼氣從脫硫塔的一端，經(jīng)過(guò)填料層(主要成分是活性炭和氧化鐵)凈化后，從另一端流出。硫化氫與填料層的氧化鐵發(fā)生反應(yīng)，生成硫化鐵;待氧化鐵反應(yīng)結(jié)束后，可進(jìn)行再生。
Biogas flows from one end of the desulfurization tower through a filler layer (mainly composed of activated carbon and iron oxide) after purification, and then flows out from the other end. Hydrogen sulfide reacts with iron oxide in the filler layer to generate iron sulfide; After the completion of the iron oxide reaction, regeneration can be carried out.
脫硫原理：
Desulfurization principle:
再生原理：
Regeneration principle:
濕法脫硫
Wet desulfurization
濕法脫硫是將沼氣送入洗滌塔，經(jīng)堿性溶液洗滌吸收后流出，洗滌液進(jìn)入富液槽、再生槽，通過(guò)使用化學(xué)藥劑方法催化、氧化，zui終將硫化物轉(zhuǎn)化為單質(zhì)硫(硫泡沫)，吸收液可以再生循環(huán)使用。
Wet desulfurization is to send biogas into the scrubber, wash and absorb it with alkaline solution, and then flow out. The washing solution enters the rich solution tank and regeneration tank. Through catalysis and oxidation with chemical agents, zui will eventually convert sulfide into elemental sulfur (sulfur foam), and the absorption solution can be recycled for use.、
生物脫硫
Biological desulfurization
生物脫硫也是濕法脫硫的一種，與上述濕法脫硫的催化氧化工藝相比，zui大區(qū)別是使用硫桿菌替代化學(xué)催化劑，將硫化物直接氧化成硫單質(zhì)。
Biological desulfurization is also a type of wet desulfurization. Compared to the catalytic oxidation process of wet desulfurization described above, the major difference in Zui is the use of Thiobacillus instead of chemical catalysts to directly oxidize sulfides into sulfur elemental substances.
反應(yīng)原理：
Reaction principle:
說(shuō)明：
explain:
干法脫硫多用于硫化氫處理負(fù)荷小，或者對(duì)脫硫效果要求很高的工況。這時(shí)，干法脫硫多用于濕法脫硫或者生物脫硫之后，進(jìn)一步脫硫。
Dry desulfurization is often used under conditions where the hydrogen sulfide treatment load is small or the desulfurization effect is highly required. At this time, dry desulfurization is often used for further desulfurization after wet desulfurization or biological desulfurization.
在制定脫硫效果時(shí)，建議根據(jù)后續(xù)設(shè)備(鍋爐或發(fā)電機(jī))對(duì)硫化氫濃度的限制，以及沼氣與天然氣消耗量的比例，制定一個(gè)合理的脫除效果。我們通常建議zui終的硫化氫含量控制在25~100ppm。
When formulating a desulfurization effect, it is recommended to establish a reasonable removal effect based on the limits on hydrogen sulfide concentration of subsequent equipment (boilers or generators) and the ratio of biogas to natural gas consumption. We generally recommend that the hydrogen sulfide content of the Zui terminal be controlled between 25 and 100 ppm.
沼氣脫水的方法
Methods of biogas dehydration
從發(fā)酵裝置出來(lái)的沼氣含有飽和水蒸氣，可用3種方法將其去除。
The biogas from the fermentation device contains saturated water vapor, which can be removed by three methods.
冷分離法。
Cold separation method.
冷分離法是利用壓力能變化引起溫度變化，使水蒸氣從氣相中冷凝下來(lái)的方法。常用的有兩種流程：A．節(jié)流膨脹冷脫水法。一般用于高壓燃?xì)?，?jīng)過(guò)節(jié)流膨脹或低溫分離，使部分水冷凝下來(lái)。B．加壓后冷卻法。如凈化氣在0.8MPa壓力下的冷卻脫水
Cold separation method is a method that utilizes changes in pressure energy to cause temperature changes and condense water vapor from the gas phase. There are two commonly used processes: A. Throttling expansion cold dehydration method. Generally used for high-pressure gas, through throttling expansion or low-temperature separation, to condense some water. B. Pressurized post cooling method. For example, cooling and dehydration of purified gas at a pressure of 0.8MPa
溶劑吸收法。屬于這類脫水溶劑的有氯化鈣、氯化鋰及甘醇類。
Solvent absorption method. Calcium chloride, lithium chloride, and glycols belong to this category of dehydration solvents.
固體物理吸水法。吸附是在固體表面力作用下產(chǎn)生的，根據(jù)表面力的性質(zhì)分為化學(xué)吸附脫水后不能再生)和物理吸附
Solid physical water absorption method. Adsorption is generated under the action of solid surface forces, which can be divided into chemical adsorption (which cannot be regenerated after dehydration) and physical adsorption according to the nature of surface forces
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2023-03-20
