随着减排政策不断深入人心，很多企业都打算利用污水站的沼气部分代替天*气，进入锅炉燃烧或发电。那么，沼气利用前的硫化氢脱除工艺(脱硫)，就成为工厂和站长们的选择难点。当前，比较常用的工艺有干法脱硫、湿法脱硫和生物脱硫，本文就将三种工艺为您做一个简单的说明和对比。
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、 常见的脱硫工艺
1、 Common desulfurization processes
1. 干法脱硫
1. Dry desulfurization
沼气从脱硫塔的一端，经过填料层(主要成分是活*炭和氧化铁)净化后，从另一端流出。硫化氢与填料层的氧化铁发生反应，生成硫化铁;待氧化铁反应结束后，可进行再*。
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. 湿法脱硫
2. Wet desulfurization
湿法脱硫是将沼气送入洗涤塔，经碱性溶液洗涤吸收后流出，洗涤液进入富液槽、通过使用化学药剂方法催化、氧化，终将硫化物转化为单质硫(硫泡沫)，吸收液可以**循环使用。
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.
生物脱硫也是湿法脱硫的一种，与上述湿法脱硫的催化氧化工艺相比，区别是使用硫杆菌替代化学催化剂，将硫化物直接氧化成硫单质。
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.
反应原理:
Reaction principle:
二、常见沼气脱硫工艺比较
2、 Comparison of common biogas desulfurization processes
干法脱硫湿法脱硫生物脱硫适用范围沼气流量小 浓度较低沼气流量大 浓度较高沼气流量大 浓度较高装机功率无高湿法30-50%运行成本高，需定期更换填料中少量电费占地面积很小设备多 占地大比干法略大运行管理运行简单 无人值守设备多 需专人管理全自动运行机 可无人值守备注定期更换填料，工作强度大机电设备多.
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
络合铁脱硫；络合铁法脱硫技术是一种以络合铁为催化剂的湿式氧化脱除硫化氢的方法，其特点是直接将H2S转变成元素S，络合铁工艺技术是一种工艺简单、工作硫容高且环保的新型脱硫技术，克服了传统脱硫工艺硫容量低、脱硫工艺复杂、副盐生成率高、环境污染严重等弊端，处理硫磺回收装置尾气可使硫磺回收率达到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%.
络合铁脱硫技术是具有自主知识产权的络合铁脱硫化氢成套技术，相对于其它络合铁脱硫技术，具有硫容量高、可撬装化、脱硫成本低、、运行稳定性高、投资低、对COS、硫醇**硫脱除率高等优点。
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.
说明:
explain:
1) 干法脱硫多用于硫化氢处理负荷小，或者对脱硫效果要求很高的工况。这时，干法脱硫多用于湿法脱硫或者生物脱硫之后，进一步脱硫。
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)在制定脱硫效果时，建议根据后续设备(锅炉或发电机)对硫化氢浓度的限制，以及沼气与天*气消耗量的比例，制定一个合理的脱除效果。我们通常建议硫化氢含量控制在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
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