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沼气提纯符合节能减排的大趋势!

时间:2021-04-12
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随着节能减排政策的日益普及,沼气提纯符合节能减排的大趋势。许多企业打算使用污水处理站的沼气部分代替天然气,然后进入锅炉进行燃烧或发电。然后,沼气利用之前的硫化氢去除过程(脱硫)成为工厂和电站所有者的选择难题。目前,常用的工艺有干法脱硫,湿法脱硫和生物脱硫。
With the increasing popularity of energy conservation and emission reduction policies, biogas purification is in line with the general trend of energy conservation and emission reduction. Many enterprises plan to use biogas from sewage treatment stations to replace natural gas, and then enter boilers for combustion or power generation. Then, the hydrogen sulfide removal process (desulfurization) before biogas utilization becomes a difficult choice for plant and power plant owners. At present, the commonly used processes are dry desulfurization, wet desulfurization and biological desulfurization.
1.干法脱硫
1. Dry desulfurization
干法,湿法和生物脱硫工艺的比较
Comparison of dry, wet and biological desulfurization processes
沼气经过填料层(主要由活性炭和氧化铁组成)净化后,从脱硫塔的一端流向另一端。硫化氢与填料层中的氧化铁反应形成硫化铁,硫化铁可以在反应后再生。
After being purified by packing layer (mainly composed of activated carbon and iron oxide), biogas flows from one end of desulfurization tower to the other. Hydrogen sulfide reacts with iron oxide in the packing layer to form iron sulfide, which can be regenerated after reaction.
               沼气提纯
2.湿法脱硫
2. Wet desulfurization
沼气提纯和湿法脱硫是将沼气送入洗涤塔。洗涤并被碱性溶液吸取后,洗涤液将流入富液槽和再生槽中。通过化学方法,将醉嘴转变为单质硫(泡沫泡沫),吸取液可以回收利用。
Biogas purification and wet desulfurization is to send biogas into washing tower. After washing and being absorbed by alkaline solution, the washing solution will flow into rich solution tank and regeneration tank. Through chemical method, the intoxicated mouth is changed into elemental sulfur (foam foam), and the absorption liquid can be recycled.
3.生物脱硫
3. Biological desulfurization
生物脱硫也是湿式脱硫的一种。与上述湿法脱硫的催化氧化过程相比,区别在于使用硫杆菌属代替化学催化剂将硫化物直接氧化成硫。
Biological desulfurization is also a kind of wet desulfurization. Compared with the catalytic oxidation process of wet desulfurization, the difference is that Thiobacillus is used instead of chemical catalyst to directly oxidize sulfide to sulfur.
说明:
explain:
1)干法脱硫通常在负荷较小或对脱硫效果要求较高的情况下使用。此时,在湿式脱硫或生物脱硫后,通常将干式脱硫用于进一步的脱硫。
1) Dry desulfurization is usually used under the condition of low load or high demand for desulfurization effect. In this case, after wet desulfurization or biological desulfurization, dry desulfurization is usually used for further desulfurization.
2)在制定脱硫效果时,建议根据后续设备(锅炉或发电机)对硫化氢浓度以及沼气和天然气消耗比例的限制,制定合理的脱硫效果。大家通常建议将硫化氢含量控制在25-100ppm。
2) It is suggested to formulate reasonable desulfurization effect according to the limitation of hydrogen sulfide concentration and consumption ratio of biogas and natural gas by follow-up equipment (boiler or generator). We usually recommend that the hydrogen sulfide content be controlled at 25-100ppm.
沼气提纯脱水方法:
Purification and dehydration method of biogas:
来自发酵厂的沼气包含饱和水蒸气,可以通过三种方法将其除去。
Biogas from the fermentation plant contains saturated water vapor, which can be removed in three ways.
(1)冷分离法。
(1) Cold separation method.
冷分离法是利用压力能的变化引起温度的变化并使水蒸气从气相中冷凝的方法。
The cold separation method is a method which uses the change of pressure energy to cause the change of temperature and condense the water vapor from the gas phase.
(2)溶剂吸取法。脱水溶剂是氯化钙,氯化锂和乙二醇。
(2) Solvent absorption method. The dehydration solvent is calcium chloride, lithium chloride and ethylene glycol.
(3)固体物理吸水法。在固体表面力的作用下产生吸附。根据表面力的性质,可分为化学吸附和物理吸附(脱水后再生)。
(3) Solid physical water absorption method. Adsorption occurs under the action of solid surface force. According to the nature of surface force, it can be divided into chemical adsorption and physical adsorption (regeneration after dehydration).

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