热负荷在线监测系统的设计及应用

介绍河北省南部电网热负荷在线监测系统的建设背景和热电负荷关系模型,从系统结构、子系统设计两方面对该系统进行分析,并说明系统功能及应用效果。     

Performance analysis of cogeneration systems based on micro gas turbine (MGT), organic Rankine cycle and ejector refrigeration cycle

In this paper, the operation performance of three novel kinds of cogeneration systems under design and off-design condition was investigated. The systems are MGT (micro gas turbine) + ORC (organic Rankine cycle) for electricity demand, MGT+ ERC (ejector refrigeration cycle) for electricity and cooling demand, and MGT+ ORC+ ERC for electricity and cooling demand. The effect of 5 different working fluids on cogeneration systems was studied. The results show that under the design condition, when using R600 in the bottoming cycle, the MGT+ ORC system has the lowest total output of 117.1 kW with a thermal efficiency of 0.334, and the MGT+ ERC system has the largest total output of 142.6 kW with a thermal efficiency of 0.408. For the MGT+ ORC+ ERC system, the total output is between the other two systems, which is 129.3 kW with a thermal efficiency of 0.370. For the effect of different working fluids, R123 is the most suitable working fluid for MGT+ ORC with the maximum electricity output power and R600 is the most suitable working fluid for MGT+ ERC with the maximum cooling capacity, while both R600 and R123 can make MGT+ ORC+ ERC achieve a good comprehensive performance of refrigeration and electricity. The thermal efficiency of three cogeneration systems can be effectively improved under off-design condition because the bottoming cycle can compensate for the power decrease of MGT. The results obtained in this paper can provide a reference for the design and operation of the cogeneration system for distributed energy systems (DES).     

流化床常压空气部分气化和半焦燃烧的试验研究

为进行煤的多联产方案研究,在1 MW循环流化床热电气多联产试验装置上,选取兖州煤、大同煤为试验煤种进行了部分空气气化和半焦燃烧试验。试验结果表明,空气部分气化方案得到的煤气热值较低,为3~5 MJ/m3,在气化炉中的碳转化率为40%~70%,剩余半焦被送入循环流化床反应器中燃烧,该系统的总体转化效率为90%左右。气化炉床层温度对气化炉碳转化率影响较大,随着温度升高其碳转化率明显提高,而燃烧炉燃烧效率呈下降趋势。石灰石的加入除了对焦油的裂解有一定的促进作用外,还具有脱除硫化氢作用,当[Ca]/[S]为3时,脱硫效率为90%。气化炉的给煤量、燃烧炉运行温度随气化炉鼓风温度提高而增加。     

浅谈缺水地区热电厂节水技术应用

介绍了神东某热电厂用水的改进情况,不同系统采用不同的节水措施,如汽轮机排气采用直接空冷技术;采用硫酸再生工艺回收再生废水;采用污水回用技术和干除灰渣技术,有效降低了系统补水量和废水排放量等。     

军粮城发电厂200MW机组连通管抽汽供热改造的可行性研究

由于天津市迅猛发展的供热需求,天津军粮城发电有限公司需要对超高压、一次中间再热、三缸三排汽凝汽式汽轮机（7号、8号）进行供热改造。因为全国没有同类型机组的改造经验,需要对机组改造的可行性、安全性、经济性作全面的评价。改造方案为：汽轮机通流部分不变,在中、低压连通管上开孔抽汽,在连通管至双流程低压缸入口前加装蝶阀调整,热网疏水回收进主机热力系统。7号、8号机组供热改造完成后,全年可实现供热224万GJ,节标煤6.3万t,在采暖期可以减少SO2排放582.4t,CO2排放16.12万t,粉尘排放1030.4t。     

Thermo-economics analysis of a cane bio-refinery

A cane bio-refinery consists of the following components: sugar mill, distillery, refinery and cogeneration power plant. The latter supplies electricity and process heat needed by the other components of the bio-refinery. Although process heat and electricity have the same units of energy, they are of different quality levels. Appropriate attention can be directed to those components causing major exergy loss. Furthermore, a device/system can be exergy efficient but may not be cost-effective. Thus, the financial implications need also to be assessed. The performance of an existing cane bio-refinery was assessed on the basis of thermo-economics analysis. It was found that the addition of an evaporator of the falling film thin type in the sugar mill would not only reduce the exergy loss but would also generate more revenues. A better-informed decision could be made for the optimisation of a bio-refinery.     

借鉴国外经验积极发展我国的区域供冷供热

介绍了美国、日本等国家区域供冷供热技术的发展，总结了其发展过程中的若干经验，与我国的具体情况做比较，提出了促进我国区域供冷供热发展的建议。     

工业园区小型分布式能源系统应用研究

通过对新兴工业园区热负荷等用能规律和园区企业需求分析,探索统一规划、分步实施、实现能源梯级利用及相关系统能效技术,建立以循环流化床锅炉＋背压式机组热电联产技术为核心的小型分布式能源系统,以解决园区热电负荷供应、能源综合利用和环境污染的问题,同时指出了项目建设存在的问题和风险.该方案是建设工业园区小型分布式能源系统的有益探索.     

采用热电联产方式的DHC在城市小区中的应用（下）

本文介绍了区域供热供冷(DHC)的发展状况(日本为例)和有关设计参数。再介绍了热电联产(CGS)的意义和各种方式的应用。最后叙述了多个在城市小区中采用CGS技术的DHC工程状况：