钠法烟气净化一体化技术和离子液脱硫技术在脱硫行业中的应用

钠法烟气净化一体化技术是一种高效的循环可利用的技术,可以脱除SO2和大部分氮氧化物,同时还可以脱除粉尘和部分重金属,其脱硫净烟气可以达到超低排放;离子液脱硫技术的脱硫效率也非常高,装置可以连续稳定运行,脱硫净烟气也可以达到超低排放、建设投资少、生产成本和能耗低等优势;二者都有各自的工艺特点和适合的工况,在脱硫行业中具有广阔的市场前景。     

烟气循环流化床干式超净技术在3×220th煤粉炉上的应用

兖矿新疆煤化工有限公司的3×220t/h煤粉炉原采用氨法脱硫工艺,但氨法脱硫系统在运行过程中出现了同步运行率低、二次细颗粒物污染严重等现象。因此,兖矿新疆煤化工有限公司决定重新选择脱硫及其配套脱硝除尘工艺。经过对比分析,重新选择了创新的烟气循环流化床干式超净技术。该技术在实际运行的一年半时间里,具有高效、经济、稳定的超低排放能力,并且没有废水产生,烟囱无需防腐排放透明等特点。在当今超低排放市场中具有较为显著的推广应用价值。     

炉内喷钙干法脱硫技术应用分析

结合焦作煤业集团电冶分公司循环流化床机组脱硫改造工程实例,对炉内喷钙干法脱硫技术进行应用分析,根据炉内干法脱硫工艺实践中存在问题的整改经验,总结出提高炉内脱硫系统安全、稳定、高效运行的有效措施。结果表明,优化改进后的炉内喷钙干法脱硫技术可实现90%以上的脱硫效率,实现锅炉烟气中SO2排放质量浓度小于150mg/Nm3的设计要求。     

关于湿法脱硫设备结垢的探讨

燃煤电厂湿法烟气脱硫过程中,脱硫设备正常运行与否是影响机组安全环保稳定运行的关键之一。本文主要针对某电厂湿法烟气脱硫中出现的除雾器结垢、脱硫塔内壁结垢,导致锅炉降负荷运行等异常情况进行分析研究,并通过相关措施进行改进优化。     

电厂湿法烟气脱硫系统运行过程节能降耗分析研究

随着我国电力建设前所未有的高速增长及控制烟气SO_2排放要求的日益严格,近15年来烟气脱硫在我国电厂大量安装。大量烟气脱硫设施的投运,为我国减少SO_2的排放、防止酸雨的污染做出了巨大贡献。大量烟气脱硫设施的投运,不仅降低电厂SO_2排放、改善周边环境,而且也增加了电厂的能耗。烟气脱硫系统的能耗主要表现在电耗、石灰石消耗、水耗等,其中以电能消耗为最大。因此,电厂烟气脱硫设施投入运行后,在保证满足环保部污染物排放要求的同时,也要研究如何降低电厂脱硫设施的运行能耗,对电厂脱硫设施经济运行具有重大意义。内蒙古大唐托克托发电有限责任公司(以下简称托电公司)8×600MW机组烟气脱硫系统经过2008年的优化运行,设备消缺及技术改造等一系列措施,2009年系统各项能耗下降,取得了良好的效果。     

浅谈湿法烟气脱硫工艺中增压风机常见故障及解决对策

进入到新世纪以来，随着我国市场经济水平的迅速提升，我国的各行各业都取得了非常快速的发展，目前。我国的脱硫环保项目越来越多，而怎样保证大容量机组脱硫设备运行的稳定性和安全性就成为了十分关键的问题。增压风机作为湿法烟气脱硫工艺系统中的最主要设备，其运行过程中的稳定性和安全性将直接影响主机系统运行的稳定性以及机组是否能够满足相应的环保要求，所以，要想保证增压风机设备的运行可靠性，我们就应对增压风机的常见故障进行分析和探讨，同时制定出科学合理的并且有针对性的解决对策。本文便对湿法烟气脱硫工艺中增压风机的常见故障以及湿法烟气脱硫工艺中增压风机常见故障的解决对策两个方面的内容进行了详细的分析，从而详细的论述了如何保证湿法烟气脱硫工艺中增压风机的稳定运行。     

双碱法脱硫工艺系统自动控制的实践

双碱法脱硫是比较成熟的一种锅炉烟气脱硫工艺方法。烟气中的SO2处于一个动态运行过程中,作为主要脱硫剂CaO的再生反应速度远远滞后于SO2的反应速度,导致在各中小型企业中无法实现该工艺系统控制的自动化,运行过程中控制指标不易稳定。江苏井神盐化股份有限公司第二公司根据双碱法工艺的运行特点对其进行优化改造,采用分段自动控制介质的pH和液位,并根据烟气中SO2的变化值自动控制脱硫吸收液流量为手段实现了系统的自动控制。     

浅析火电厂烟气脱硫方法的选择与应用

火电厂二氧化硫的大量排放,对生态环境造成严重危害,为加大火电厂烟气治理力度,国家环保部门提出了更高要求。本文概述了火电厂烟气脱硫的必要性,重点分析了湿法烟气脱硫技术,及部分干法脱硫技术,并对各种烟气脱硫技术进行比较,为火电厂脱硫工艺的选择提供参考。     

印染行业水气联合治理研究

利用印染废水的碱性对印染厂锅炉烟气进行水膜除尘和脱硫,可达到以废治废的目的,在技术上亦简单可行,文章介绍碱性印染废水用于除尘,脱硫后灰水处理工艺,以及处理后水回用于印染的工艺。     

关于火力发电厂的烟气脱硫废水处理技术探究

文章结合实际工作经验,从烟气脱硫废水的水质分析及废水排放的标准出发,并着重就烟气脱硫废水处理技术的工艺原理、工艺流程以及相关设备的应用进行了探索与研究。     

Effect of operating parameters and reactor structure on moderate temperature dry desulfurization

A moderate temperature dry desulfurization process at 600-800 degrees C was studied in a pilot-scale circulating fluidized bed flue gas desulfurization (CFB-FGD) experimental facility. The desulfurization efficiency was investigated for various operating parameters, such as bed temperature, CO2 concentration, and solids concentration. In addition, structural improvements in key parts of the CFB-FGD system, i.e., the cyclone separator and the distributor, were made to improve the desulfurization efficiency and flow resistance. The experimental results show that the desulfurization efficiency increased rapidly with increasing temperature above 600 degrees C due to enhanced gas diffusion and the shift of the equilibrium for the carbonate reaction. The sorbent sulfated gradually after quick carbonation of the sorbent with a long particle residence time necessary to realize a high desulfurization ratio. A reduced solids concentration in the bed reduced the particle residence time and the desulfurization efficiency. A single-stage cyclone separator produced no improvement in the desulfurization efficiency compared with a two-stage cyclone separator. Compared with a wind cap distributor, a large hole distributor reduced the flow resistance which reduced the desulfurization efficiency due to the reduced bed pressure drop and worsened bed fluidization. The desulfurization efficiency can be improved by increasing the collection efficiency of fine particles to prolong their residence time and by improving the solids concentration distribution to increase the gas-solid contact surface area.     

造纸白泥在烟气脱硫中的应用

介绍碱回收白泥组成和粒径分布,白泥作为燃煤锅炉烟气脱硫剂的反应原理,概述脱硫工程的设备选型和参数选择以及运行效果.脱硫效率达到95%,白泥循环利用,固废减量化处理,脱硫石膏可以回用.     

NaCl—CaCl2体系水溶液蒸发浓缩过程中浓度变化与沸点关系的研究

氨碱法制碱过程中产生大量钙废液,废液中主要含有氯化钙、氯化钠等,将废液注井对硫酸钠型盐矿水溶采卤,可以实现井下脱硫生产液体盐或通过真空制盐生产精制盐产品。文章对NaC l—CaC l2体系水溶液蒸发浓缩过程中浓度及沸点变化进行了研究,为该工艺的工业生产状态下的操作条件的确定提供了数据支持,为实现制碱废液的有效利用和精制盐的提取创造了有利条件。     

Regenerating fuel-gas desulfurizing agents by using bipolar membrane electrodialysis (BMED): effect of molecular structure of alkanolamines on the regeneration performance

Alkanolamine sulfates are the heat-stable salts formed in the fuel-gas desulfurization by using alkanolamines, and they can cause the deterioration of absorption performance and loss of absorbents. In this paper, a method was reported to regenerate three alkanolamines (monoethanolamine, MEA; diethanolamine, DEA; and N,N'-dimethylethanolamine, DMEA) by using BMED. The effects of operation parameters (electrolyte concentration, alkanolamine sulfate concentration, and current density) on regeneration were analyzed on the basis of ion dimensions and intrinsic transport velocities, ion concentration, Donnan dialysis, ion orientation, and the interaction between alkanolamines and membranes. The process cost is estimated to be 0.48, 0.32, and 0.30 dollar/kg for MEA, DEA, and DMEA, respectively. BMED is not only feasible for alkanolamine regeneration but also environmental-friendly and economically attractive, especially as the bipolar membrane cost decreases and pollution control is strengthened.     

Effect of solids concentration distribution on the flue gas desulfurization process

A dry flue gas desulfurization (FGD) process at 600-800 degrees C was studied in a pilot-scale circulating fluidized bed (CFB) experimental facility. Various fresh sorbent distribution types and internal structures were modeled numerically to investigate their effect on the gas-solid flow and sulfate reaction characteristics. Experimental results show that, after the fresh sorbent supply was stopped, the desulfurization efficiency declined rapidly even though the sorbent recirculation was maintained. Therefore, the fresh sorbent is the main contributor to the desulfurization process and the primary effect of the recirculated sorbent was to evenly distribute the fresh sorbent and to prolong the sorbent particle residence time. The numerical results demonstrate thatthe desulfurization efficiency varied greatly for the various fresh sorbent bottom injection methods. The desulfurization efficiency of the bottom-even injection method was 1.5 times that of the bottom two-sided injection method. Internal structures effectively improved the fresh sorbent solids concentration distribution and the desulfurization efficiency. Optimized internal structures increased the desulfurization efficiency of the bottom two-sided injection method by 46%, so that it was very close to that of the bottom-even injection method with only a 4.6% difference.     

Increase in desulfurization activity of Rhodococcus erythropolis KA2-5-1 using ethanol feeding

Rhodococcus erythropolis KA2-5-1 is one of the best strains for the desulfurization of dibenzothiophene (DBT) via a sulfur-specific pathway in which DBT is converted to the end product, 2-hydroxybiphenyl, by releasing sulfite via DBT-sulfone and 2-(2'-hydroxyphenyl) benzene sulphinate. The objective of this research is to develop a culture method in order to attain a high cell density with a high level of specific desulfurization activity. Compared with glucose or glycerol, ethanol was found to be a preferable carbon source for obtaining a high specific activity (SA) of desulfurization. When the amount of DBT fed was restricted by feeding 2.9 mg-DBT/g-ethanol solution, the maximum SA and final cell concentration were 135.5 (mmol-2HBP/kg-dry cell weight-h) and 37 (g-dry cell weight/l), respectively. On the other hand, when glucose or glycerol was used as a carbon source, the SA was lower than 50 (mM-2HBP/kg-dry cell weight-h) and the final cell concentration was also lower than 27 (g-dry cell weight/l). The activities of the desulfurization enzymes in R. erythropolis KA2-5-1 grown on ethanol were remarkably higher than when the strain was grown on glucose or glycerol. It was also suggested that NADH, which is produced by the biochemical reaction of NAD with ethanol catalyzed by alcohol dehydrogenase, might contribute to the conversion of FMN to FMNH2, which is a coenzyme for the activities of desulfurization enzymes.     

锅炉水处理固体废物用作燃煤锅炉炉内脱硫

水处理固体废物用作锅炉内燃煤脱硫添加剂，可以有效地催化脱硫反应，减缓高温下CaSO4分解，使燃煤脱硫过程的最佳脱硫温度更加接近煤燃烧温度，提高燃煤脱硫效率。     

烟气脱硫脱硝技术的现状与发展探讨

烟气中所含有的硫、硝成分对空气会产生严重的污染影响,所以烟气脱硫脱硝技术是处理二氧化硫、氮氧化物等废弃物的重要方式,对于保护环境具有重要作用.本文阐述了烟气脱硫脱硝技术的重要意义,并通过分析烟气脱硫技术现状、烟气脱硝技术现状以及同时脱硫脱硝技术的现状,对烟气脱硫脱硝技术使用炭基新型催化技术进行展望,探讨了改性海水法技术...     

Catalytic seawater flue gas desulfurization process: an experimental pilot plant study

In previous articles by the authors on seawater S(IV) oxidation kinetics, a significant catalytic effect was demonstrated by means of a commercially available activated carbon. The aims of this study carried out at pilot plant scale were to assess the use of high-efficiency structured packing and to validate the positive results obtained previously in laboratory studies. A comparison between a packed tower and a spray column was made by maintaining the same desulfurization efficiency. A 47% reduction in seawater flow can be obtained with a packed tower. This option seems to be more economical, with a reduction in operation costs of least of 33%. With the appropriate activated carbon, it is possible to reach a greater oxidation rate at a low pH level than by operating conventionally at a high pH level without a catalyst. A preliminary technical and financial comparison between the advanced seawater desulfurization process (equipped with a packed tower and a catalytic oxidation plant) and the conventional process (spray tower and noncatalytic oxidation) was carried out.     

HPLC 法检测HDBRS-1 菌株发酵液中2- 羟基联苯含量

采用高效液相色谱法测定脱硫菌发酵液中2- 羟基联苯(2-HBP)的含量。以Delta-PakTM C18 (300A,3.9mm× 150mm,5μm)为色谱柱,甲醇:水(7:3,V/V)为流动相,流速1ml/min,用紫外检测器在260nm 处检测2-HBP。结果显示2-HBP 标准品的保留时间为2.6min,线性范围为0～80mg/L,利用该方法测得HDBRS-1 菌株发酵液中,2-HBP 的生成量为6.11mg/L。