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生物脱硫技术对大型沼气工程有多重要

时间:2019-05-24
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随着我国对可再生能源的开发和利用的不断深入发展, 利用畜禽粪便厌氧发酵产沼气是一种非常有前景的能源利用途径,但所产生的沼气中都含有H2S气体,由于它是一种腐蚀性很强的化合物,所以沼气脱硫是沼气利用的关键环节。本文以某工程调试与运行实例分析了大型沼气工程中的生物脱硫技术,以为同类型工程提供参考。
With the development and utilization of renewable energy in China, anaerobic fermentation of livestock and poultry manure to produce biogas is a very promising way of energy utilization, but the biogas produced contains H2S gas. As it is a highly corrosive compound, biogas desulfurization is the key link of biogas utilization. In this paper, the bio-desulfurization technology in large-scale biogas project is analyzed based on an engineering debugging and operation example, which can provide reference for similar projects.
目前沼气脱硫的方法有两大类,即物理化学法和生物法。物理化学法包括干法脱硫和湿法脱硫,已被广泛地应用且积累了丰富的经验,但该方法存在运行费用高、投资大、产生二次污染等缺点;而生物法以不需催化剂和氧化剂、不需处理化学污泥、少污染、低能耗、高效率、可回收单质硫等优点,引起了人们的广泛关注。为此,笔者以某公司热电联产沼气工程为例,介绍了该沼气工程调试与运行时生物脱硫技术的具体运用。
At present, there are two kinds of methods for biogas desulfurization, namely physical chemical method and biological method. Physicochemical methods, including dry desulfurization and wet desulfurization, have been widely used and accumulated abundant experience, but they have disadvantages of high operating costs, large investment and secondary pollution. Biological methods have attracted wide attention for their advantages of no catalyst and oxidant, no chemical sludge treatment, less pollution, low energy consumption, high efficiency and recoverable elemental sulfur. 。 For this reason, taking the biogas project of a company as an example, the specific application of bio-desulfurization technology in debugging and operation of the biogas project is introduced.
生物脱硫的装置主要由生物脱硫塔和曝气水箱构成,从厌氧罐内导出的沼气由脱硫塔底部进入,脱硫循环水由泵打入脱硫塔顶,两者在塔内逆向接触反应,且塔内充有填料以供脱硫菌附着生长,同时也利于气水均匀分布以充分接触。生物脱硫塔及曝气水箱都采用耐酸玻璃钢制作,循环泵也使用耐酸性泵。脱硫塔的负荷为8m3 (沼气) /(m3·h)左右。
沼气生物脱硫设备
The device of biological desulfurization is mainly composed of biological desulfurization tower and aeration tank. The biogas derived from anaerobic tank enters from the bottom of desulfurization tower, and the circulating water of desulfurization is pumped into the top of desulfurization tower. Both react in reverse contact in the tower, and the tower is filled with fillers for the attachment and growth of desulfurization bacteria, which is also conducive to the uniform distribution of gas and water for full contact. Biological desulfurization tower and aeration water tank are made of acid-resistant FRP, and circulating pump is also made of acid-resistant pump. The load of the desulfurization tower is about 8 m3 (methane) / (m3.h).
本工程采用生物脱硫的方法对沼气进行脱硫处理,主要利用无色硫细菌在适宜的温度、湿度和微氧条件下的代谢作用将H2S氧化成单质硫或亚硫酸。生物脱硫分为3个阶段 :
Biological desulfurization is used to desulfurize biogas in this project. H2S is oxidized to elemental sulfur or sulfite mainly by the metabolic action of colorless sulfur bacteria under suitable temperature, humidity and micro-oxygen conditions. Biological desulfurization can be divided into three stages:
1.H2S 气体的溶解过程,即由气相转化为液相;
1. The dissolution process of H2S gas, i.e. from gas phase to liquid phase;
2.溶解后的H2S被微生物吸收,转移至微生物的体内;
2. The dissolved H2S is absorbed by microorganisms and transferred to microorganisms.
3.进入微生物细胞内的H2S作为营养物被微生物分解、转化和利用,从而达到去除H2S的目的。
3. As nutrients, H2S entering microbial cells is decomposed, transformed and utilized by microorganisms to remove H2S.
虽然生物脱硫具有能耗少、去除率高等特点,但必须给硫细菌营造一个适宜的环境,才能确保其具有较高的生物活性,以达到佳的脱硫效果。
Although biological desulfurization has the characteristics of low energy consumption and high removal rate, it is necessary to create a suitable environment for sulfur bacteria to ensure their high biological activity in order to achieve the best desulfurization effect.
好了,今天的内容就先给大家介绍到这里了,收藏沼气生物脱硫设备厂家官网:http://www.dh-gwsg.com,可以了解更多详细信息!
Okay, today's content will be introduced to you first, collect biogas biological desulfurization equipment manufacturer's official website: http://www.dh-gwsg.com, you can learn more details!
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