沼气湿法和干法脱硫是目前2大主要脱硫方法，他们之间的区别主要是通过以下几个方面来实现：干法脱硫与湿法脱硫的区别湿法和干法脱硫是目前2大主要脱硫方法，他们之间的区别主要是通过以下几个方面来实现。
Wet and dry desulfurization of biogas are the two main desulfurization methods at present. The difference between them is mainly realized through the following aspects: the difference between dry desulfurization and wet desulfurization. Wet and dry desulfurization are the two main desulfurization methods at present. The difference between them is mainly realized through the following aspects.
一、干法沼气脱硫
1、 Dry biogas desulfurization
干法沼气脱硫是指应用粉状或粒状吸收剂、吸附剂或催化剂来脱除烟气中的SO2。它的优点是工艺过程简单，无污水、污酸处理问题，能耗低，特别是净化后烟气温度较高，有利于烟囱排气扩散，不会产生“白烟”现象，净化后的烟气不需要二次加热，腐蚀性小;其缺点是脱硫效率较低，设备庞大、投资大、占地面积大，操作技术要求高。主要的方法有:
Dry biogas desulfurization refers to the application of powdered or granular absorbent, adsorbent or catalyst to remove SO2 from flue gas. It has the advantages of simple process, no sewage and acid treatment problems, low energy consumption, especially the high temperature of the purified flue gas, which is conducive to the exhaust diffusion of the chimney and will not produce the phenomenon of "white smoke", and the purified flue gas does not need secondary heating and is less corrosive; Its disadvantages are low desulfurization efficiency, huge equipment, large investment, large floor area and high operation technical requirements. The main methods are:
吸着剂喷射法按所用吸着剂不同分为钙基和钠基工艺，吸着剂可以干态，湿润态或浆液，喷入部位可以为炉膛、省煤器和烟道。钙硫比为2时，干法工艺的脱硫效率达50%～70%，钙的利用率达50%，这种方法较适合老电厂改造，因为在电厂排烟流程中不需增加任何设备就能达到脱硫目的。
The sorbent injection method is divided into calcium based and sodium based processes according to the sorbent used. The sorbent can be dry, wet or slurry, and the injection part can be furnace, economizer and flue. When the calcium sulfur ratio is 2, the desulfurization efficiency of dry process is 50% ~ 70% and the utilization rate of calcium is 50%. This method is more suitable for the transformation of old power plants, because the desulfurization purpose can be achieved without adding any equipment in the smoke exhaust process of power plants.
接触氧化法此法与工业制酸法一样，是以硅石为载体，以五氧化二钒或硫酸钾为催化剂，使SO2氧化成SO3。SO3与水汽作用形成硫酸或与氨作用生成(NH4)2SO4。此法是高温操作，所需费用高，但由于技术上较为成熟，目前国内外对高浓度烟气的治理多采用此法。
Contact oxidation method this method is the same as the industrial acid making method. It uses silica as the carrier and vanadium pentoxide or potassium sulfate as the catalyst to oxidize SO2 into SO3. SO3 reacts with water vapor to form sulfuric acid or with ammonia to form (NH4) 2SO4. This method is a high-temperature operation and requires high cost. However, due to its relatively mature technology, this method is mostly used for the treatment of high concentration flue gas at home and abroad.
电子束辐照法本法的工艺技术简单，它是利用高能电子束的光化学反应，用氨作为吸收剂。烟气通过辐照反应器，经辐照后，产生了大量的氢氧基和氧原子，烟气中二氧化硫和氮氧化物形成硫酸和硝酸，继而与添加物氨反应生成硫酸铵、硝酸铵等混合物，作为农用肥料。
Electron beam irradiation method the process technology of this method is simple. It uses the photochemical reaction of high-energy electron beam and ammonia as absorbent. The flue gas passes through the irradiation reactor. After irradiation, a large number of hydroxyl groups and oxygen atoms are produced. Sulfur dioxide and nitrogen oxides in the flue gas form sulfuric acid and nitric acid, and then react with the additive ammonia to form ammonium sulfate, ammonium nitrate and other mixtures as agricultural fertilizer.
二、湿法沼气脱硫
2、 Wet biogas desulfurization
湿法沼气脱硫是指应用液体吸收剂(如水或碱性溶液等)洗涤烟气脱除烟气中的SO2。它的优点是脱硫效率高，设备小、投资省、操作较容易、容易控制以及占地面积小;而缺点是易造成二次污染，存在废水后处理问题，能耗高，特别是洗涤后烟气的温度低，不利于烟囱排气的扩散，易产生“白烟”，需要二次加热，腐蚀严重等。主要的方法有:
Wet biogas desulfurization refers to the application of liquid absorbent (such as water or alkaline solution) to wash the flue gas to remove SO2 in the flue gas. It has the advantages of high desulfurization efficiency, small equipment, low investment, easy operation, easy control and small floor area; The disadvantage is that it is easy to cause secondary pollution, there are problems of wastewater post-treatment, high energy consumption, especially the low temperature of flue gas after washing, which is not conducive to the diffusion of chimney exhaust, easy to produce "white smoke", need secondary heating, serious corrosion and so on. The main methods are:
石灰石-石膏法该工艺是利用石灰石/石灰石浆液洗涤烟道气，使之与SO2反应，生成亚硫酸钙(CaSO3)，经分离的亚硫酸钙可以抛弃，也可以通入空气强制氧化和加入一些添加剂，以石膏形式进行回收。为了减轻SO2洗涤设备的负荷，先要将烟道气除尘，然后再进入除尘设备与吸收液发生反应。石灰/石灰石-石膏法技术比较成熟，吸收剂价廉易得，运行可靠，应用广，脱硫效率可达90%以上。
Limestone gypsum method this process uses limestone / limestone slurry to wash flue gas and react with SO2 to produce calcium sulfite (CaSO3). The separated calcium sulfite can be discarded, or it can be forced to oxidize with air and add some additives to recover in the form of gypsum. In order to reduce the load of SO2 washing equipment, the flue gas must be dedusted first, and then enter the dedusting equipment to react with the absorption liquid. The technology of lime / limestone gypsum method is relatively mature, the absorbent is cheap and easy to obtain, the operation is reliable, the application is the widest, and the desulfurization efficiency can reach more than 90%.
钠法此法是用氢氧化钠、碳酸钠、或亚硫酸钠溶液为吸收剂吸收烟气中的SO2，因该法具有对SO2吸收速度快，管路和设备不易堵塞等优点，所以应用比较广泛，吸收液可以经无害化处理后弃去或适当方法处理后获得副产品NaSO3晶体、石膏、硫酸等。
Sodium method this method uses sodium hydroxide, sodium carbonate or sodium sulfite solution as absorbent to absorb SO2 in flue gas. Because this method has the advantages of fast SO2 absorption speed and difficult blockage of pipelines and equipment, it is widely used. The absorption solution can be discarded after harmless treatment or treated by appropriate methods to obtain by-products NaSO3 crystal, gypsum, sulfuric acid, etc.
磷铵复肥法该法是利用天磷矿石和氨为原料，在烟气脱硫过程中副产品为磷铵复合肥料，工艺流程主要包括四个过程，即:活炭脱硫并制得稀硫酸;稀硫酸萃取磷矿制得稀硫酸溶液;磷酸和氨的中和液[(NH4)2HPO4]二级脱硫;料浆浓缩干燥制磷铵复肥。脱硫效率为95%以上。
Ammonium phosphate compound fertilizer method this method uses tianphosphorus ore and ammonia as raw materials, and the by-product in the process of flue gas desulfurization is ammonium phosphate compound fertilizer. The process flow mainly includes four processes: desulfurization with live carbon and preparation of dilute sulfuric acid; Dilute sulfuric acid solution is prepared by extracting phosphate rock with dilute sulfuric acid; Secondary desulfurization of Neutralization Solution [(NH4) 2HPO4] of phosphoric acid and ammonia; The slurry is concentrated and dried to produce ammonium phosphate compound fertilizer. The desulfurization efficiency is more than 95%.
The above is a detailed introduction to wet desulfurization, which I hope will be helpful to you If you have any questions, please contact us We will provide service for you with our attitude https://www.hneee.net
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