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沼气脱水工艺汇总!

时间:2020-04-14
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脱水工艺
Dehydration process
沼气脱水是因为导气管中如果积累了水会溶解硫化氢腐蚀管道。此外,当沼气被加压储存时,沼气中的水会凝结冻坏储气罐。其脱除方法如下:
The reason for the dehydration of biogas is that if water accumulates in the gas conduit, it will dissolve hydrogen sulfide and corrode the pipeline. In addition, when the biogas is stored under pressure, the water in the biogas will condense and freeze the gas storage tank. The removal method is as follows:
冷凝法
Condensation method
不同的温度下沼气中饱和水蒸汽的含量不同,在35℃时水的含量接近5%,在输入天然气网前沼气中的水必须去除。针对不同的净化工艺,在各个阶段有不同的方法。在压缩之前需除去冷凝水,这样,在洗涤去除二氧化碳和硫化氢工艺中就不需要再针对气体进行干燥。在吸收净化工艺之前也常常需要对气体进行干燥,主要有冷凝法和吸附法,最常用的为冷凝法,即在热交换系统中通过冷却器冷却气体而除去冷凝水。这种方法由于是在热交换器的表层冷却,通常比露点低0.5℃-1℃,为了取得更低的露点,必须在冷凝之前先压缩气体,然后再释放到需要的压力。
The content of saturated water vapor in biogas is different under different temperatures. At 35 ℃, the content of water is close to 5%. The water in biogas must be removed before it is put into the natural gas network. For different purification processes, there are different methods in each stage. The condensate needs to be removed before compression, so that there is no need to dry the gas in the process of washing and removing carbon dioxide and hydrogen sulfide. Before the absorption and purification process, it is often necessary to dry the gas, mainly including condensation method and adsorption method. The most commonly used method is condensation method, which is to remove the condensate water by cooling the gas through the cooler in the heat exchange system. This method is usually 0.5 ℃ - 1 ℃ lower than the dew point due to the surface cooling of the heat exchanger. In order to obtain a lower dew point, the gas must be compressed before condensation, and then released to the required pressure.
沼气脱硫
吸附干燥
Adsorption drying
吸附干燥是指通过硅胶,氧化铝或氧化镁等干燥剂来吸收气体中的水分,待干燥的气体通过吸附床中的干燥剂被干燥。通常使用两套装置,当一个工作的时候,另外一个可以再生。干燥剂的再生可以通过两种途径。一种是可以用一部分(3%-8%)的高压干燥气体再生干燥剂,这部分气体可以重新回流至压缩机人口。另外一种是在常压下用空气和真空泵来再生干燥剂,此法会把空气混入沼气中,一般不会有。
Adsorption drying refers to the absorption of water in the gas through silica gel, alumina or magnesium oxide, and the gas to be dried is dried through the desiccant in the adsorption bed. Usually two sets of devices are used. When one works, the other can be regenerated. There are two ways to regenerate desiccant. One is that a part of high-pressure dry gas (3% - 8%) can be used to regenerate the desiccant, which can be returned to the compressor population. The other is to use air and vacuum pump to regenerate desiccant under normal pressure. This method will mix air into biogas, generally not.
吸收法
Absorption method
水可以被乙二醇、三乙二醇和吸水性的盐吸收,有许多种盐都有不同的吸水性,通常在干燥吸附塔中填充上小颗粒盐,待干燥沼气从底部通入,被水溶解了的饱和盐溶液积累在吸附塔的底部,通过阀门排除,然后换上新盐颗粒,盐一般不用再生。在一般工业应用干燥器中,不同的盐露点通常在10℃到15℃之间。
Water can be absorbed by glycol, triethylene glycol and water absorbing salt. There are many kinds of salts with different water absorption properties. Usually, small salt particles are filled in the drying adsorption tower. When the dry biogas is introduced from the bottom, the saturated salt solution dissolved by water accumulates at the bottom of the adsorption tower, and is discharged through the valve, and then replaced with new salt particles. Generally, salt does not need to be regenerated. In general industrial dryer, different salt dew point is usually between 10 ℃ and 15 ℃.