城市固体垃圾气化发电燃气净化研究

发布时间：2018-08-01 16:15

【摘要】：随着环境保护要求的不断提高、城市垃圾资源化越来越受到重视,垃圾气化发电技术因具有碳转化率高,无二VA英排放的优点将发展为垃圾焚烧发电的替代技术。为了保证燃气轮机的安全运行,必须对气化燃气进行净化,以去除其中的颗粒物、酸性气体杂质及机械水等。针对垃圾气化燃气成分复杂、酸性气体多、含尘粒径细等特点,提出用湿式电除尘净化燃气的新工艺,在去除细颗粒物的同时协同脱除酸性气体。通过对垃圾气化燃气在小型电除尘器进行模拟静态放电实验,得到气体电晕放电的规律;在湿式电除尘器喷淋水中加入Na OH溶液,探究其对伏安特性的影响,最后在湿式电除尘器中进行了HCl和H2S两种酸气体吸收实验,得到了液气比、Na OH浓度、电场风速、雾滴粒径等条件对酸气脱除效率的影响规律,结果表明:(1)垃圾气化混合气在电除尘器内部能够建立起晕电压,因此可以使用电除尘技术来对特定混合气进行净化。(2)Na OH溶液的添加能够降低电晕放电的起晕电压和火花放电电压,以及提高相同二次电压下的二次电流值,但是影响都相对微弱,可以忽略不计。(3)HCl的整体去除率高于H2S,两种酸性气体的去除效率均随着液气比、Na OH质量浓度的增加而提高,随着气流速度、雾滴粒径的增加而降低。利用湿式电除尘器净化垃圾气化发电燃气,开辟了燃气净化的新思路,能够在去除细颗粒物的同时,协同脱除酸性气体,充分发挥湿式电除尘器的综合利用效率,简化工艺流程、降低运行成本。
[Abstract]:With the increasing requirement of environmental protection, more and more attention has been paid to the utilization of municipal solid waste (MSW). Because of the advantages of high carbon conversion rate and no diVA emission, MSW gasification power generation technology will be developed as an alternative technology for MSW incineration power generation. In order to ensure the safe operation of the gas turbine, it is necessary to purify the gasified gas to remove particulate matter, acid gas impurities and mechanical water. In view of the characteristics of waste gasification gas such as complex composition, more acid gas and fine particle size of dust, a new process of purifying gas by wet electric precipitation is put forward, in which fine particles are removed and acid gas is removed synergistically. Through simulating static discharge experiment of garbage gasification gas in small electrostatic precipitator, the law of gas corona discharge is obtained, and NaOH solution is added to the spray water of wet electrostatic precipitator to explore its influence on voltammetric characteristics. Finally, two kinds of acid gas absorption experiments, HCl and H _ 2S, were carried out in wet electrostatic precipitator. The effects of NaOH concentration of liquid-gas ratio, wind speed of electric field and particle size of droplet on the removal efficiency of acid gas were obtained. The results show that: (1) the halo voltage can be set up in the electrostatic precipitator by waste gasification mixture. Therefore, the specific mixture can be purified by using the technology of electric precipitator. (the addition of 2) Na OH solution can reduce the corona discharge voltage and spark discharge voltage, and increase the secondary current value at the same secondary voltage. However, the effects are relatively weak and can be ignored. (3) the overall removal efficiency of HCl is higher than that of H _ 2S, and the removal efficiency of two acidic gases increases with the increase of mass concentration of NaOH, and decreases with the increase of gas velocity and droplet size. Using wet electric precipitator to purify garbage gasification power generation gas has opened up a new way of gas purification, which can remove fine particles and remove acid gas in cooperation, so as to give full play to the comprehensive utilization efficiency of wet electric precipitator. Simplify process flow and reduce operation cost.
【学位授予单位】：燕山大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X705

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