烟煤与石油焦混烧时静电除尘器运行条件的变化

通过B&W410t/h和HG220t/h煤粉锅炉掺烧石油焦的试验研究,介绍了因掺烧所引起的烟气排放量、含尘浓度、化学成份等烟气特性方面以及粉尘颗粒组成、成份和导电性能等粉尘特性方面的变化,并分析了它对静电除尘器的运行条件所造成的影响.     

综合考虑除尘及锅炉效率的节能技术

分析了锅炉排烟温度对飞灰比电阻及电除尘效率的影响,介绍了一种根据飞灰比电阻实测值计算电除尘效率的方法,提出了同时从经济性和环境保护的角度来确定锅炉设计或改造时排烟温度的数值,其值应在120 ℃～130 ℃以下,介绍了加装烟气加热器降低锅炉排烟温度的方法,并分析了其经济性和环保效益.     

温度对无电晕式静电除尘器除尘性能的影响

基于实验研究 ,分析讨论了含尘气流温度对无电晕式静电除尘器除尘性能的影响。结果表明 ,提高温度可明显改善其荷电性能 ,提高除尘效率。与高温情况相比 ,在低温区 ,温度对除尘效率的影响更加显著。     

火电厂锅炉排烟温度升高对静电除尘器效率影响的探讨

火电厂排烟温度升高对静电除尘器效率产生一定影响,通过分析烟温升高对飞灰比电阻、烟气流量、烟气粘度及驱进速度的影响,来确定排烟温度升高对静电除尘效率的影响,对同类型电厂改造具有一定的借鉴意义。     

燃煤电厂静电除尘器除尘效率降低的原因分析以及解决措施研究

静电除尘器除尘效率降低可能导致总排口中烟尘排放不迭标,对大气环境造成污染.分析了导致静电除尘器效率降低的主要原因,对以上导致静电除尘器效率降低的主要原因提出了相应的解决措施,为静电除尘器的故障分析提供参考.     

电极形式和布置方式对静电旋风除尘器性能的影响

静电旋风除尘器是在旋风除尘器内加入电极以引入高压静电场,实现离心除尘机理和静电除尘机理相结合的多机理除尘设备。静电除尘机理如何与离心除尘机理有机地结合从而发挥各自的优势,是静电旋风除尘器值得研究的主要问题,也是国内外学者研究的重点之一。静电旋风除尘器内的电极布置和单纯的管式静电除尘器和板式静电除尘器的电极布置差别很大。电极的形式和布置方式不仅关系到静电旋风除尘器能否很好地发挥电场力和离心力的综合作用,而且对电极的安装、电源的要求也是非常重要的。通过大量的实验,研究了静电旋风除尘器的电极形式和布置方式对除尘器性能的影响。     

锅炉燃烧调整对NOx排放和锅炉效率影响的试验研究

在2台典型的1025 t/h锅炉上进行了燃烧调整降低NOx排放浓度的试验研究,通过改变过量空气系数、辅助风配风方式、运行负荷和制粉系统运行方式等,测定了锅炉尾部烟道NOx排放浓度,分析了锅炉运行工况、运行方式对NOx排放的影响.结果表明:降低过量空气系数,烟煤锅炉NOx减排效果比贫煤锅炉好得多;降低负荷,烟煤锅炉的NOx排放量降低值较大;缩腰式配风的NOx排放浓度比均匀配风方式约降低10%,制粉系统的运行方式影响炉内燃料的燃烧状态和温度分布,也影响NOx的生成和排放.在不降低锅炉效率的前提下,调整燃烧工况,可降低锅炉排放NOx浓度1O%～20%.     

Comparison of combustion characteristics of petroleum coke and coal in one-dimensional furnace

The effect of primary air fraction f₁, outer secondary air swirl strength and excess oxygen coefficient on the combustion characteristics of petroleum coke, Hejin lean coal and Shenmu soft coal are researched on a one-dimensional furnace using a dual channel swirl burner. The results show that with the increase in primary air fraction f₁, the NO_x emission concentrations of both Hejin lean coal and petroleum coke increase, and the combustion worsens in the earlier stage, but the burn-out rate of Shenmu soft coal is improved. The NO_x emission concentration obtains a minimum value with an increase in f₁. The ignition and burn-out rate of petroleum coke and Shenmu soft coal are optimal when Ω_dl is minimum and Ω_dl=0.87, respectively. However, both the NO_x emission concentration of petroleum coke and Shenmu soft coal are minimum when Ω_dl=1.08. The increase in excess oxygen coefficient delays the ignition of petroleum coke, worsens the combustion condition and increases the NO_x emission concentration, but it greatly decreases the NO_x emission concentration of Shenmu soft coal.     

Comparison of combustion characteristics of petroleum coke and coal in one-dimensional furnace

The effect of primary air fraction ƒ ₁, outer secondary air swirl strength and excess oxygen coefficient on the combustion characteristics of petroleum coke, Hejin lean coal and Shenmu soft coal are researched on a one-dimensional furnace using a dual channel swirl burner. The results show that with the increase in primary air fraction ƒ ₁, the NO _x emission concentrations of both Hejin lean coal and petroleum coke increase, and the combustion worsens in the earlier stage, but the burn-out rate of Shenmu soft coal is improved. The NO _x emission concentration obtains a minimum value with an increase in ƒ ₁. The ignition and burn-out rate of petroleum coke and Shenmu soft coal are optimal when Ω_dl is minimum and Ω_dl= 0.87, respectively. However, both the NO _x emission concentration of petroleum coke and Shenmu soft coal are minimum when Ω_dl= 1.08. The increase in excess oxygen coefficient delays the ignition of petroleum coke, worsens the combustion condition and increases the NO _x emission concentration, but it greatly decreases the NO _x emission concentration of Shenmu soft coal.     

烟煤掺烧石油焦对煤粉炉燃烧影响的试验研究

通过不同的煤焦掺混比的燃烧试验，研究石油焦掺烧对煤粉锅炉运行稳定性和经济性的影响及运行的调节手段。     

哈尔滨发电公司电除尘器提效改造

对中国华电集团哈尔滨发电有限公司3#炉电除尘器运行中存在的问题进行了分析,介绍了BE型静电除尘器的特点和电除尘器提效改造的实施方案。对改造前后电除尘器主要技术指标进行了对比。改造后,电除尘器除尘效率提高。     

Co-gasification reactivity of petroleum coke with coal and coal liquefaction residue

In this work, experimental study on co-gasification of petroleum coke with coal and coal liquefaction residue (CLR) under CO₂ atmosphere was investigated in a temperature-programmed reactor. The effect of ashes from coal/CLR and metallic oxide on gasification reactivity of petroleum coke was also investigated. The calculated and experimental gasification conversion was compared to analysis the synergetic effect during co-gasification. The results indicated that the petroleum coke has a much lower reactivity than that of coal/CLR chars, while it can be greatly improved by co-gasifying with coal/CLR. The synergetic effect on co-gasification of petroleum coke with coal/CLR was presented as the progress of co-gasification reaction. It was found that the synergetic effect can be enhanced with increasing coal proportion. However, as the increase of coal rank, the synergetic effect gradually weakened during the co-gasification process. In the selected coal/CLR samples, the low rank coal and CLR exhibited a better effect when co-gasifying with petroleum coke. The difference of synergetic effect was probably attributed to the catalytic effect of mineral matters in different coal/CLR. According to composition analyses of various ashes and the co-gasification reactivity of samples, it can be concluded that high content of active components such as Ca- and Fe-in coal/CLR was beneficial to co-gasifying with petroleum coke, while high content of inert Si- and Al- components in coal tended to resist the reaction.     

循环流化床煤和石油焦混烧污染物生成及脱除模型研究

文中建立了循环流化床锅炉混烧石油焦时污染物生成和脱除数学模型。该模型充分考虑了石油焦的燃烧特性。模拟计算给出了在焦煤比为1：1的运行工况下污染(SO2、NO和N2O)的排放浓度。     

410 t/h循环流化床锅炉煤焦混烧热力性能试验研究

在额定蒸发量为410t/h的循环流化床锅炉上进行以烟煤、石油焦混合物为燃料的锅炉热力性能试验,根据ASME锅炉性能规程计算了锅炉热效率,并对温度、汽水流量、气态污染物排放、灰渣含碳量等多个参数进行了测试,整理得到了一些规律性的结果。结果表明,锅炉以烟煤、石油焦为燃料,添加石灰石脱硫,采用尾部飞灰再循环,额定负荷下锅炉热效率可达92.8%;炉内密相区温度分布均匀;床温、分离器入口温度、排烟温度和排渣温度等各温度稳定;主蒸汽流量、给水流量、减温水流量等汽水流量波动小;气态污染物均可控制在较低水平。这对我国循环流化床锅炉燃用煤焦混合物的设计和运行工作有一定借鉴意义。     

煤粉与废塑料混合在模拟高炉风温下的燃烧试验研究

为了研究向高炉中混合喷吹废塑料和煤粉的可行性,在模拟高炉喷吹风温条件下改变空气流量、混合试样中的废塑料颗粒粒径和混合掺入废塑料比例进行燃烧性能(平均燃烧速率)研究。结果表明:空气流量对燃烧平均速率的影响最为显著,其次是塑料比例,塑料粒度对混合试样燃烧平均速率的影响最小;在高温燃烧下废塑料所产生的灰烬量低于煤粉。     

Production of hydrogen from coal and petroleum coke: technical and economic perspectives

This paper examines the technical and economic feasibility of producing hydrogen at a refinery from coal and petroleum coke via gasification-shift-purification steps. A number of potential gasifiers were analyzed for their applicability to gasify a high sulfur bituminous coal and a high sulfur delayed coke. A pressurized entrained bed process was selected from the analysis for production of 50 MM SCFD hydrogen. A conceptual design was performed to develop overall materials and energy balances and major equipment lists for use in the conceptual cost estimates. Gilbert/Commonwealth's proprietary project analysis model was used to calculate the product costs. Sensitivity of the product costs with the coke and coal costs was also analyzed and compared with those from natural gas reforming. It was found that coke is highly competitive with natural gas for the production of hydrogen.     

燃煤改烧石油焦CFB锅炉改造与运行特性研究

介绍某项目循环流化床锅炉完成的燃煤改烧石油焦改造设计和运行特性.运行结果表明,锅炉通过实施纯烧石油焦针对性改造后,纯烧石油焦情况下,锅炉运行状态非常稳定,运行参数满足设计要求,NOx原始排放达到超低排放要求.