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沼氣脫硫不可或缺的一部分

在可再生能源領(lǐng)域,沼氣作為一種清潔能源,正發(fā)揮著愈發(fā)重要的作用。然而,沼氣中通常含有一定量的硫化氫,若不加以處理,不僅會(huì)對設(shè)備造成腐蝕,還會(huì)污染環(huán)境,危害人體健康。因此,沼氣脫硫成為沼氣利用過程中不可或缺的關(guān)鍵步驟。

In the field of renewable energy, biogas, as a clean energy source, is playing an increasingly important role. However, biogas usually contains a certain amount of hydrogen sulfide. If left untreated, it not only corrodes equipment but also pollutes the environment and endangers human health. Therefore, biogas desulfurization has become an indispensable key step in the process of biogas utilization.

沼氣中硫化氫的來源主要是厭氧發(fā)酵過程中含硫有機(jī)物的分解。硫化氫具有強(qiáng)烈的刺激性氣味,且化學(xué)性質(zhì)活潑。它能與金屬發(fā)生化學(xué)反應(yīng),生成金屬硫化物,導(dǎo)致沼氣輸送管道、儲(chǔ)存設(shè)備以及利用設(shè)備(如沼氣發(fā)電機(jī)、沼氣鍋爐等)出現(xiàn)腐蝕現(xiàn)象,縮短設(shè)備使用壽命,增加維修成本。例如,在沼氣發(fā)電站中,未經(jīng)脫硫的沼氣會(huì)使發(fā)電機(jī)的火花塞、氣缸等部件快速腐蝕,嚴(yán)重影響發(fā)電效率與設(shè)備穩(wěn)定性。同時(shí),硫化氫排放到大氣中,會(huì)形成酸雨,對生態(tài)環(huán)境造成破壞,并且其毒性對周圍居民的呼吸系統(tǒng)等也會(huì)產(chǎn)生嚴(yán)重危害。

The main source of hydrogen sulfide in biogas is the decomposition of sulfur-containing organic compounds during anaerobic fermentation. Hydrogen sulfide has a strong pungent odor and is chemically active. It can undergo chemical reactions with metals to generate metal sulfides, causing corrosion in biogas transmission pipelines, storage equipment, and utilization equipment (such as biogas generators, biogas boilers, etc.), shortening equipment service life, and increasing maintenance costs. For example, in biogas power plants, desulfurized biogas can cause rapid corrosion of components such as spark plugs and cylinders of the generator, seriously affecting power generation efficiency and equipment stability. At the same time, hydrogen sulfide emissions into the atmosphere can form acid rain, causing damage to the ecological environment, and its toxicity can also pose serious hazards to the respiratory systems of surrounding residents.

為解決這一問題,人們研發(fā)了多種沼氣脫硫方法。常見的有干法脫硫、濕法脫硫和生物脫硫。干法脫硫是較為傳統(tǒng)且應(yīng)用廣泛的方法,通常采用氧化鐵等脫硫劑。脫硫劑填充在脫硫塔內(nèi),當(dāng)沼氣通過脫硫塔時(shí),硫化氫與脫硫劑中的活性成分發(fā)生化學(xué)反應(yīng),生成硫化物被固定在脫硫劑表面,從而達(dá)到脫硫目的。這種方法設(shè)備簡單、操作方便,適用于硫化氫含量較低、氣量較小的沼氣工程。例如一些農(nóng)村戶用沼氣池,多采用干法脫硫,能有效去除沼氣中的硫化氫,保障農(nóng)戶安全使用沼氣進(jìn)行炊事等活動(dòng)。

To solve this problem, various methods of biogas desulfurization have been developed. Common methods include dry desulfurization, wet desulfurization, and biological desulfurization. Dry desulfurization is a traditional and widely used method, usually using desulfurizers such as iron oxide. The desulfurizer is filled in the desulfurization tower. When biogas passes through the desulfurization tower, hydrogen sulfide reacts chemically with the active components in the desulfurizer, generating sulfides that are fixed on the surface of the desulfurizer, thus achieving the purpose of desulfurization. This method has simple equipment and easy operation, and is suitable for biogas projects with low hydrogen sulfide content and small gas volume. For example, some rural households use biogas digesters, which often use dry desulfurization to effectively remove hydrogen sulfide from biogas and ensure the safe use of biogas for cooking and other activities.

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濕法脫硫則借助液體脫硫劑來吸收沼氣中的硫化氫。在吸收塔內(nèi),沼氣與噴淋而下的脫硫劑溶液充分接觸,硫化氫被溶液吸收。吸收后的溶液經(jīng)過再生處理,可循環(huán)使用。濕法脫硫效率高,能處理硫化氫含量較高、氣量大的沼氣,常用于大型沼氣工程,如城市污水處理廠的沼氣回收系統(tǒng)。

Wet desulfurization utilizes liquid desulfurizers to absorb hydrogen sulfide from biogas. In the absorption tower, biogas comes into full contact with the desulfurizer solution sprayed down, and hydrogen sulfide is absorbed by the solution. The absorbed solution can be recycled after regeneration treatment. Wet desulfurization has high efficiency and can treat biogas with high hydrogen sulfide content and large gas volume. It is commonly used in large-scale biogas projects, such as the biogas recovery system in urban sewage treatment plants.

生物脫硫是近年來興起的新型脫硫技術(shù),利用微生物的代謝作用將硫化氫轉(zhuǎn)化為單質(zhì)硫。該方法具有能耗低、環(huán)境友好等優(yōu)點(diǎn)。在特定的生物反應(yīng)器中,微生物在適宜條件下將硫化氫氧化,生成的單質(zhì)硫可回收利用,既實(shí)現(xiàn)了沼氣脫硫,又創(chuàng)造了一定的經(jīng)濟(jì)效益,代表了沼氣脫硫技術(shù)的發(fā)展方向。

Biological desulfurization is a new desulfurization technology that has emerged in recent years, which utilizes the metabolic process of microorganisms to convert hydrogen sulfide into elemental sulfur. This method has the advantages of low energy consumption and environmental friendliness. In a specific bioreactor, microorganisms oxidize hydrogen sulfide under suitable conditions, and the generated elemental sulfur can be recycled, which not only achieves biogas desulfurization but also creates certain economic benefits, representing the development direction of biogas desulfurization technology.

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