隨著節(jié)能減排政策不斷深入人心，很多企業(yè)都打算利用污水站的沼氣部分代替天*氣，進(jìn)入鍋爐燃燒或發(fā)電。那么，沼氣利用前的硫化氫脫除工藝(脫硫)，就成為工廠和站長們的選擇難點。當(dāng)前，比較常用的工藝有干法脫硫、濕法脫硫和生物脫硫，本文就將三種工藝為您做一個簡單的說明和對比。
As the policy of energy conservation and emission reduction continues to be deeply rooted in the hearts of the people, many enterprises intend to use the biogas part of the sewage station to replace natural gas and enter the boiler for combustion or power generation. Then, the hydrogen sulfide removal process (desulfurization) before biogas utilization has become a difficult choice for factories and station owners. At present, the commonly used processes include dry desulfurization, wet desulfurization and biological desulfurization. This paper will give you a simple description and comparison of the three processes.
一、 常見的脫硫工藝
1、 Common desulfurization processes
1. 干法脫硫
1. Dry desulfurization
沼氣從脫硫塔的一端，經(jīng)過填料層(主要成分是活*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*。
Biogas flows out from one end of the desulfurization tower after being purified by the packing layer (mainly composed of live carbon and iron oxide) and from the other end. Hydrogen sulfide reacts with iron oxide in the filler layer to form iron sulfide; After the iron oxide reaction is completed, re *.
2. 濕法脫硫
2. 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、通過使用化學(xué)藥劑方法催化、氧化，終將硫化物轉(zhuǎn)化為單質(zhì)硫(硫泡沫)，吸收液可以**循環(huán)使用。
Wet desulfurization is to send the biogas into the scrubbing tower, wash and absorb it with alkaline solution, and then flow out. The scrubbing solution enters the rich solution tank, catalyzes and oxidizes through the use of chemical agents, and finally converts the sulfide into elemental sulfur (sulfur foam). The absorption solution can be * * recycled.
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，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 kind of wet desulfurization. Compared with the above catalytic oxidation process of wet desulfurization, the difference is that Thiobacillus is used instead of chemical catalyst to directly oxidize sulfide into sulfur.
反應(yīng)原理:
Reaction principle:
二、常見沼氣脫硫工藝比較
2、 Comparison of common biogas desulfurization processes
干法脫硫濕法脫硫生物脫硫適用范圍沼氣流量小 濃度較低沼氣流量大 濃度較高沼氣流量大 濃度較高裝機功率無高濕法30-50%運行成本高，需定期更換填料中少量電費占地面積很小設(shè)備多 占地大比干法略大運行管理運行簡單 無人值守設(shè)備多 需專人管理全自動運行機 可無人值守備注定期更換填料，工作強度大機電設(shè)備多.
Dry desulfurization wet desulfurization biological desulfurization scope of application biogas flow is small, concentration is low, biogas flow is large, concentration is high, installed power is not high, wet 30-50% operation cost is high, a small amount of electricity in the filler needs to be replaced regularly, the floor area is very small, more equipment covers a large area, slightly larger than dry method, operation and management is simple, unattended equipment needs more special personnel to manage, full-automatic operation machine can be unattended, and the filler can be replaced in due time, High working intensity and many electromechanical equipment
絡(luò)合鐵脫硫；絡(luò)合鐵法脫硫技術(shù)是一種以絡(luò)合鐵為催化劑的濕式氧化脫除硫化氫的方法，其特點是直接將H2S轉(zhuǎn)變成元素S，絡(luò)合鐵工藝技術(shù)是一種工藝簡單、工作硫容高且環(huán)保的新型脫硫技術(shù)，克服了傳統(tǒng)脫硫工藝硫容量低、脫硫工藝復(fù)雜、副鹽生成率高、環(huán)境污染嚴(yán)重等弊端，處理硫磺回收裝置尾氣可使硫磺回收率達(dá)到99.99%。
Complex iron desulfurization; Complex iron desulfurization technology is a wet oxidation method for removing hydrogen sulfide with complex iron as catalyst, which is characterized by directly transforming H2S into element S. complex iron process technology is a new desulfurization technology with simple process, high working sulfur capacity and environmental protection, which overcomes the disadvantages of traditional desulfurization process, such as low sulfur capacity, complex desulfurization process, high by-salt generation rate and serious environmental pollution, Treating the tail gas of sulfur recovery unit can make the sulfur recovery rate reach 99.99%.
絡(luò)合鐵脫硫技術(shù)是具有自主知識產(chǎn)權(quán)的絡(luò)合鐵脫硫化氫成套技術(shù)，相對于其它絡(luò)合鐵脫硫技術(shù)，具有硫容量高、可撬裝化、脫硫成本低、節(jié)能、運行穩(wěn)定性高、投資低、對COS、硫醇**硫脫除率高等優(yōu)點。
Complex iron desulfurization technology is a complete set of complex iron hydrogen sulfide removal technology with independent intellectual property rights. Compared with other complex iron desulfurization technologies, it has the advantages of high sulfur capacity, skid mounted, low desulfurization cost, energy saving, high operation stability, low investment, high removal rate of COS and mercaptan * * sulfur, etc.
說明:
explain:
1) 干法脫硫多用于硫化氫處理負(fù)荷小，或者對脫硫效果要求很高的工況。這時，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。
1) Dry desulfurization is mostly used under the condition of low hydrogen sulfide treatment load or high desulfurization effect. At this time, dry desulfurization is mostly used for further desulfurization after wet desulfurization or biological desulfurization.
2)在制定脫硫效果時，建議根據(jù)后續(xù)設(shè)備(鍋爐或發(fā)電機)對硫化氫濃度的限制，以及沼氣與天*氣消耗量的比例，制定一個合理的脫除效果。我們通常建議硫化氫含量控制在25~100ppm。
2) When formulating the desulfurization effect, it is suggested to formulate a reasonable desulfurization effect according to the limitation of subsequent equipment (boiler or generator) on the concentration of hydrogen sulfide and the proportion of biogas and natural gas consumption. We usually recommend that the hydrogen sulfide content be controlled at 25 ~ 100ppm.
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2022-05-05
