運(yùn)行過厭氧反應(yīng)器的工程師都知道，厭氧反應(yīng)會產(chǎn)生沼氣，而沼氣中往往含有一定量的硫化氫（H2S）。不同的工業(yè)廢水，沼氣中硫化氫的含量各有不同。如果硫化氫含量過高，就必須在進(jìn)鍋爐燃燒之前脫除沼氣中的硫化氫，以避免腐蝕管道和鍋爐。今天，我們就介紹一下當(dāng)前比較的沼氣生物脫硫技術(shù)。
Engineers who have run anaerobic reactors know that anaerobic reaction will produce biogas, which often contains a certain amount of hydrogen sulfide (H2S). The content of hydrogen sulfide in biogas varies with different industrial wastewater. If the content of hydrogen sulfide is too high, the hydrogen sulfide in biogas must be removed before combustion in the boiler to avoid corrosion of pipelines and boilers. Today, we will introduce the relatively advanced biogas biological desulfurization technology.
1沼氣的來源：沼氣通常來源于污水厭氧處理、糞便、秸稈發(fā)酵、石油天然氣等，凈化后的沼氣可作為清潔能源，替代天然氣、煤炭，用于發(fā)電、取暖、生產(chǎn)蒸汽等；分離出的硫化氫氣體被轉(zhuǎn)換成固態(tài)的生物硫磺，可作為化肥、化工等行業(yè)的原料。沼氣經(jīng)過吸收凈化可資源利用，即實(shí)現(xiàn)了節(jié)能減排，也節(jié)約了企業(yè)的生產(chǎn)成本。
1. Source of biogas: biogas usually comes from anaerobic treatment of sewage, feces, straw fermentation, oil and natural gas, etc. the purified biogas can be used as clean energy to replace natural gas and coal for power generation, heating, steam production, etc; The separated hydrogen sulfide gas is converted into solid biological sulfur, which can be used as raw materials for chemical fertilizer, chemical industry and other industries. After absorption and purification, biogas can be used as resources, which not only realizes energy conservation and emission reduction, but also saves the production cost of enterprises.
沼氣脫硫和煙氣脫硫的區(qū)別：沼氣脫硫和煙氣脫硫雖然都是脫硫，但確是完全不同的兩種工藝。煙氣脫硫是從工業(yè)廢氣中脫除二氧化硫SO2和SO3。我們常說的脫硫脫硝，就指的是脫除二氧化硫。而沼氣脫硫是指從沼氣中脫除硫化氫(H2S)，以減少對后續(xù)管道、燃燒鍋爐或發(fā)電機(jī)的腐蝕。
Difference between biogas desulfurization and flue gas desulfurization: Although both biogas desulfurization and flue gas desulfurization are desulfurization, they are completely different processes. Flue gas desulfurization is to remove sulfur dioxide, SO2 and SO3 from industrial waste gas. Desulfurization and denitration, as we often say, refers to the removal of sulfur dioxide. Biogas desulfurization refers to the removal of hydrogen sulfide (H2S) from biogas to reduce the corrosion of subsequent pipelines, combustion boilers or generators.
什么是沼氣生物脫硫？沼氣生物脫硫（簡稱沼氣脫硫）是利用生物菌種去除沼氣中腐蝕性強(qiáng)、毒性強(qiáng)的硫化氫氣體的一種工藝方法，這個工藝具有自動化程度高，流程簡潔，運(yùn)行成本低等優(yōu)點(diǎn)。
What is biogas biological desulfurization? Biogas biological desulfurization (biogas desulfurization for short) is a process method for removing highly corrosive and toxic hydrogen sulfide gas from biogas by using biological bacteria. This process has the advantages of high automation, simple process and low operation cost.
工藝原理；厭氧發(fā)酵產(chǎn)生的沼氣進(jìn)入洗滌塔，通過與堿性循環(huán)噴淋液發(fā)生吸收反應(yīng)，從而去除沼氣中的硫化氫。吸收硫化氫的富液回流至生物反應(yīng)器內(nèi)，通過生物轉(zhuǎn)化，將硫化氫轉(zhuǎn)化成固態(tài)單質(zhì)硫磺，并將溶液再生為可用于洗滌沼氣的堿性吸收液（亦成為貧液），從而實(shí)現(xiàn)了吸收劑的回收和再生循環(huán)利用。通過硫沉淀器實(shí)現(xiàn)硫磺固體的分離。
Process principle; The biogas produced by anaerobic fermentation enters the scrubber and reacts with the alkaline circulating spray liquid to remove hydrogen sulfide in the biogas. The rich liquid absorbing hydrogen sulfide returns to the bioreactor, converts hydrogen sulfide into solid elemental sulfur through biotransformation, and regenerates the solution into alkaline absorption liquid (also known as lean liquid) that can be used to wash biogas, so as to realize the recovery, regeneration and recycling of absorbent. The separation of sulfur solids is realized through sulfur precipitator.
此工藝將弱堿性條件下硫化氫的物理化學(xué)吸收與空氣作用下堿性溶液的生物再生相結(jié)合。含有硫化氫的沼氣進(jìn)入洗滌塔，在這里被吸收硫化氫的堿溶液洗滌，處理后的沼氣硫化氫去除率高達(dá)99.5%。經(jīng)系統(tǒng)處理后，沼氣可用于燃?xì)獍l(fā)電機(jī)發(fā)電，用作鍋爐燃料或輸入至當(dāng)?shù)匦⌒凸饩W(wǎng)絡(luò)。
This process combines the physical and chemical absorption of hydrogen sulfide under weak alkaline conditions with the biological regeneration of alkaline solution under the action of air. The biogas containing hydrogen sulfide enters the scrubber, where it is washed by the alkali solution absorbing hydrogen sulfide. The hydrogen sulfide removal rate of the treated biogas is as high as 99.5%. After being processed by the system, biogas can be used for gas generator power generation, used as boiler fuel or input to the local small gas supply network.
幾乎不含硫化氫的沼氣從洗滌塔頂部逸出，含硫化氫的溶液流入生物反應(yīng)器，在此細(xì)菌在限制供氧條件下將其氧化為單質(zhì)硫和堿。該系統(tǒng)的少量排出液（含鈉鹽）和副產(chǎn)品硫磺中都不含硫化物，排放沒有問題。
Biogas containing almost no hydrogen sulfide escapes from the top of the scrubber, and the solution containing hydrogen sulfide flows into the bioreactor, where the bacteria oxidize it into elemental sulfur and alkali under the condition of limited oxygen supply. A small amount of discharged liquid (including sodium salt) and by-product sulfur of the system do not contain sulfide, so there is no problem in discharge.
生物脫硫的技術(shù)優(yōu)勢：
Technical advantages of biological desulfurization:
全自動無人值守，高度穩(wěn)定可靠。
Fully automatic unattended, highly stable and reliable.
深度的硫化氫去除（出口硫化氫含量50-100ppm）
Deep hydrogen sulfide removal (outlet hydrogen sulfide content 50-100ppm)
可耐受氣體流量和硫負(fù)荷較寬范圍的波動
It can withstand a wide range of fluctuations in gas flow and sulfur load
沼氣不會被空氣稀釋：沼氣和空氣之間有嚴(yán)格的物理分離
Biogas will not be diluted by air: there is a strict physical separation between biogas and air
只需少量的堿、水和營養(yǎng)物
Only a small amount of alkali, water and nutrients are needed
沒有堵塞和污垢的風(fēng)險(xiǎn)，因此維護(hù)工作量少
Therefore, there is no risk of dirt and blockage
常溫常壓運(yùn)行
Normal temperature and pressure operation
產(chǎn)生單質(zhì)硫：可作為肥料和殺蟲劑
Produce elemental sulfur: it can be used as fertilizer and pesticide
The above is a detailed introduction to biogas desulfurization. I hope it will help you If you have any questions, please contact us We will provide service for you with professional attitude http://www.aycqc.cn
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2022-05-05
