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沼气提纯精制天然气脱硫技术的选择

时间:2019-06-26
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沼气提纯精制天然气中脱硫技术路线的选择应重点考虑硫化氢浓度、处理规模、浓度波动范围、处理费用等几个方面。当硫化氢浓度较高及处理规模较大时,易采用碱洗生物再生脱硫技术和或碱洗催化再生脱硫技术。在运行成本面前相对后者较低,但在抗浓度变化冲击方面,后者又优于前者,同时在投资方面,后者也优于前者。
The selection of desulfurization technology route in biogas purification and refining natural gas should focus on hydrogen sulfide concentration, treatment scale, concentration fluctuation range and treatment cost. When the concentration of hydrogen sulfide is high and the treatment scale is large, alkali washing biological regeneration desulfurization technology and alkali washing catalytic regeneration desulfurization technology are easy to be used. Compared with the latter, the latter is lower in terms of operation cost, but in terms of resisting the impact of concentration change, the latter is better than the former, and in terms of investment, the latter is also better than the former.
生物脱硫工艺是一种新型的脱硫工艺,越来越受到企业的欢迎。生物脱硫的基本原理是利用硫杆菌属和丝硫茵属类微生物代谢的作用,将硫化氢与氧气合成为硫酸盐进而除去沼气中的硫氢,脱硫产物为硫酸盐。
Biological desulfurization process is a new type of desulfurization process, which is more and more welcomed by enterprises. The basic principle of biological desulfurization is to synthesize hydrogen sulfide and oxygen into sulfate and then remove hydrogen sulfide from biogas by utilizing the metabolism of microorganisms of Thiobacillus and sericin, and the desulfurization product is sulfate.
虽然其使用较为便捷,运行成本较低,但由于脱硫过程中同时引入了杂质气体,在后续工序中无法去除,同时生物脱硫刚刚起步,技术还不成熟,大多使用进口技术和设备,因此投资成本相对较高,大约为常规干法脱硫的3~5倍。
Although its use is relatively convenient and its operation cost is low, because impurity gas is introduced in the desulfurization process at the same time, it can not be removed in the subsequent process. At the same time, biological desulfurization has just started and the technology is not mature. Most of them use imported technology and equipment, so the investment cost is relatively high, about 3-5 times as that of conventional dry desulfurization.
生物脱硫塔
近几年,国内少数企业和科研机构合作研究,根据沼气项目及沼气中硫化氢的特性,对碱洗催化再生脱硫技术进行了大量富有成效的改进和提升,特别是解决了像堵塔、再生效果不好、单质硫不易拿出等高浓度硫化氢脱除上的难题。
In recent years, a small number of domestic enterprises and scientific research institutions have cooperated to study, according to the characteristics of biogas projects and hydrogen sulfide in biogas, a large number of fruitful improvements and improvements have been made to the alkali washing catalytic regeneration desulfurization technology, especially to solve the problems of high concentration hydrogen sulfide removal such as blocking tower, poor regeneration effect and difficulty in extracting elemental sulfur.
干法脱硫、PSA和膜法脱硫多适用于硫化氢初脱后的精脱硫,或气量比较小、硫化氢浓度比较低的沼气精制项目; 生物脱硫虽然运行成本比较低,但因为引入了大量的氮氧等杂质气体而不宜在沼气精制天然气领域应用。
Dry desulfurization, PSA and membrane desulfurization are mostly suitable for refined desulfurization after initial desulfurization of hydrogen sulfide, or for biogas refining projects with small gas volume and low concentration of hydrogen sulfide. Although biological desulfurization has low operation cost, it is not suitable to be applied in the field of biogas refining natural gas because of the introduction of a large number of impurity gases such as nitrogen and oxygen.
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