Comprehensive Energy-Saving Technology for RTO Flue Gas Waste Heat Utilization

In the automobile painting workshop,the oven will discharge harmful exhaust gas,the exhaust gas can be reused through the TNV system,the natural gas can meet the emission standard to the atmosphere after burning,and the high temperature gas discharged TNV the system can carry considerable heat.Utilization can effectively improve the economic benefits of the factory.At present,the more mature scheme is to heat the high temperature exhaust gas through the heat exchanger,which can reduce the steam consumption of the factory.Based on the analysis of the comprehensive energy saving content of waste heat utilization of RTO flue gas,this paper hopes to provide some reference and reference for readers.

Study on Curing Effect and the Waste Heat Recovering Equipment Design of Flue Gas of Bulk Curing Barn

In order to realize tobacco curing with energy saving and emission reduc- ing and lower cost, the waste heat recovering equipment was designed and built on blowing-upward type bulk curing barn. The comparative experiment of tobacco leaf curing was conducted between a bulk curing barn with waste heat of flue gas and conventional bulk curing barn. The results showed that the effect of saving coal in bulk curing barn with waste heat of flue gas was obvious than the contrast. The coal consumption quantity was 1.531 kg per kg of dry tobacco leaf. The saving coal in bulk curing barn with use waste heat of flue gas was 0.181 kg per kg of dry tobacco leaf than the contrast and saving coal rate was 10.57%. The electricity consumption quantity was 0.593 kWh per kg of dry tobacco leaf. The saving elec- tricity quantity in bulk curing barn with use waste heat of flue gas was 0.022 kWh/kg and the saving electricity rate was 3.58% than the contrast. The saving curing cost was 0.158 yuan per kg of dry tobacco leaf and saving cost rate 9.09% in bulk cur- ing barn with use waste heat of flue gas than the contrast. The appearance quality, grade structure and primary chemical composition had no significant difference be- tween bulk curing barn with use waste heat of flue gas and the contrast.

A Compound Cycle for Power Generation by Utilizing Residual Heat of Flue Gas in Electric Steelmaking Process

Electric furnace short process steelmaking is one of the most important steelmaking methods in the world today, and the waste heat recovery potential of electric furnace flue gas is huge.?The research on the recovery of electric furnace flue gas waste heat is of great significance. In order to make better use of this part of the heat,?in this paper, a compound cycle of nitrogen Brayton cycle as a first-order cycle and toluene transcritical Rankine cycle as a second-order cycle is proposed to recover waste heat from furnace flue gas in steelmaking process for power generation. A mathematical model was established with the net output power as the objective function and the initial expansion pressure, the final expansion pressure, the initial expansion temperature and the initial pressure of the second cycle as the independent variables. The effect of multivariate on the net output power of the waste heat power generation cycle is studied, and then, the optimal parameters of the compound cycle are determined. The results show that under the general electric furnace steelmaking process, the power generation efficiency of this new cycle can be increased by 21.02% compared with the conventional cycle.

Technical Measures and Selections for Reducing Flue Gas Heat Loss of Large Coal-Fired Boilers

The main technologies for reducing flue gas heat loss of pulverized coal-fired boilers are introduced, and the suitability of these technologies for boiler operation and the principles for selection of these technologies are explored. The main conclusions are： 1） the non-equilibrium control over flue gas flow rates at the inlet of the air heater and the reversal rotation of the air heater rotator should be popularized as regular technologies in large boilers; 2） increasing the area of the air heater to reduce the flue gas heat loss in pulverized coal-fired boilers should be the top option and increasing the area of the economizer be the next choice; 3） low- pressure economizer technology could save energy under special conditions and should be compared with the technology of increasing economizer area in terms of technical economics when the latter is feasible; 4） the hot primary air heater is only suitable to the pnlvefizing system with a large amount of cold air mixed.

Preparation of gangue ceramsite by sintering pot test and potential analysis of waste heat recovery from flue gas

Preparation of ceramsite from solid waste based on the sintering process is a new technology and had a high efficiency in improving producing capability, decreasing consumption of liquefied petroleum gas (LPG), and recovering waste heat of flue gas. An experiment sintering gangue ceramsite was conducted in a 25 kg scale sintering pot with a 100 cm height. The combustion characteristics, phase transformation, and the release profile of SO_(2)^(*) (SO and/or SO_(2)) and NO_(x)^(*) (N_(2)O, NO, and/or NO_(2)) of gangue ceramsite during the sintering process were studied by X-ray diffraction analysis, X-ray fluorescence spectrometry, thermogravimetry–differential thermogravimetry–differential scanning calorimetry, and measurement of physical properties of ceramsite and gas components of flue gas. The results showed that the gangue ceramsite had excellent properties, and its compressive strength and water absorption were 8.2–9.6 MPa and 8.9%–9.8%, respectively, far exceeding the requirement of standard (GB/T 17431.1–2010). The ignition temperature of gangue ceramsite was 443 ℃, and the ignition loss was 14.60 mass% at 1000 ℃. Kaolinite and calcite disappeared at 600 and 800 ℃, respectively. Albite disappeared and mullite formed at 1000 ℃. Two peaks of SO_(2)^(*) emissions emerged in the range of 311–346 mg m^(-3) near 500 ℃ of upper layer ceramsite and 420–489 mg m^(-3) near 1000 ℃ of lower layer ceramsite, respectively. NO_(x)^(*) emissions peak emerged in the range of 227–258 mg m^(-3) near 550 ℃ of the upper layer ceramsite, which was related to the oxidation of sulfide and the combustion of LPG. Gangue is a direct heat source for sintering of ceramsite as well. During sintering process, the heat of flue gas above and below 400 ℃ accounts for 55.9% and 30.0% of the all-output heat, respectively, and was potentially used for producing waste-heat steam or electricity as by-products and drying raw materials during its own initial sintering process, which can realize combined mass and heat utilization for the gangue and further reduce the cost of sintered gangue ceramsite.

Transforming Waste Heat into“Renewable Heat”

Introduction:The current worldwide electric power&heat&cool production has a negative impact on the environment by emissions and enormous leaks of low-potential waste heat.Transformation of unused industrial low power heat into“renewable heat”useful to enhance the efficiency of the system is essential and actual innovation in the field of worldwide environmental protection.By introducing and defining the terminology of low-potential,“renewable”,“green heat”has created a new,parallel category of research in the energy sector.Traditional co-generation systems produce heat for space heating and hot water and generate electricity.Moving to tri-generation allows growing demand for air conditioning for homes,offices and commercial spaces such as server rooms and switchboards to be met simultaneously or on a seasonal basis.Tri-generation,or combined cooling,heat and power,is the process by which some of the heat produced by a co-generation plant is used to generate chilled water for air conditioning or refrigeration.Usually an absorption chiller is linked to the plant to provide this functionality.The technical solution is related to the new efficient manner and system of simultaneous generation of heat/cold from multiple heat sources,which has not yet been known,but in practice required.New system also enables advantageous utilization of solar power in supporting of the cooling output.The innovative system can be operated also within the existing central heating distribution systems.

烟气余热蒸发处理锅炉脱硫废水技术的开发及应用

针对炼化企业污水“近零”排放难以消纳高盐高氨氮脱硫废水的问题,研发利用锅炉烟气余热在烟道直接蒸发脱硫废水的流态模型,开展废水液滴粒径、雾化角度、烟速、烟温等变量对液滴完全蒸发时间、蒸发距离的数值模拟研究和小试实验,完成烟道蒸发室的工业结构设计,并经过2个阶段的废水工业化试运行,验证了该技术的合理性和可行性。对试运行过程中出现的问题进行了客观的分析评价,提出了必要的整改措施,开创了脱硫废水低成本、低能耗环保处理的新途径。

耦合余热回收下电站锅炉尾部烟气热能高效梯级利用系统设计

针对电站锅炉尾部烟气热能利用效率较低,梯级利用数值模拟过程与全尺度数据分析过程偏差较大的问题,设计了一种耦合余热回收下的电站锅炉尾部烟气热能高效梯级利用系统。实验结果表明,系统的最佳烟气热能高效梯级节点利用情况和热能梯级置换情况整体都保持在60%以上,采用热能阶梯式温差电站后,系统整体效率提高了约22%,证明了所设计系统的使用优越性。

耦合海水淡化的船舶柴油机排气净化装置设计

为综合高效实现船舶柴油机烟气废热回收海水淡化以提升尾气净化率,本文以KincaidB&W6L90GE型船舶柴油机为研究对象,提出一种耦合海水淡化的船舶柴油机废气高效净化技术,介绍了耦合海水淡化的船舶柴油机排气净化技术原理,理论设计计算耦合海水淡化的船舶柴油机废气净化系统的蒸发段和冷凝段,得到烟气余热回收制淡系统蒸发段和冷凝段的换热系数分别为42.29W/(m^(2)·℃)和1067.42W/(m^(2)·℃)、换热面积分别为517.31m^(2)和38.26m^(2),该系统整体尺寸为Φ6m,总高度为6.452m,并进一步得到船舶烟气净化系统整体尺寸为Φ4.0m,总高度为9.66m,完成了系统的整体尺寸设计计算和结构布置。

社区老科协建设现状及对策研究

老科技工作者退休后大都在社区居住,管理模式由原有的单位制向社区制转变,需要顺应时代变化通过社区老科协组织建设助力老科技工作者老有所为,余热生辉。通过调查研究方法和问卷数据分析,了解老科技工作者对社区老科协建设及开展社区服务的认知、参与意愿、诉求,发现九成以上的老科技工作者有继续发挥余热的意愿以及社区老科协组织活动频次偏低,开展活动前三位为科普宣讲、文体娱乐活动和培训技术,并发现组织文体活动、老科技工作者心理调适服务和满足其继续学习的需求是当前社区老科协提供服务的着力点,社区老科协建设中也存在经费不足和场地受限等方面的问题,文章从基层党建引领机制创新、合作治理推动组织增能、“五社联动”和智慧化建设提高精细化服务水平等方面提出社区老科协助力老科技工作者发挥余热的实现路径。

危废处理中余热锅炉设计探讨

伴随新时代的飞速发展,构建与绿色发展相协调的环境管理成为人们持续关注的焦点之一,在此过程中危废处理是其中的一个重要环节。危险固体废物的来源广泛,成分复杂,类型众多。危废会对环境产生较深的不良影响,而且也会严重威胁人们的身心健康。由于我国制造业发展迅猛,当前存在着很大的工业危险固体废弃物处理压力。随着危废的产量逐年提升,急需探究相关解决办法,现代危险固体废物处置技术大致包括了物理技术、化工技术和生态技术等。危废的无害化、减量化、资源化,有利于世界的可持续发展,而焚烧危废产生的烟气中含有大量余热资源,有一定的回收价值。通过对危废处理中的高温烟气研究分析,利用锅炉系统对烟气进行余热回收,综合利用。

垃圾焚烧烟气余热深度利用探索

垃圾焚烧发电项目的热能利用率为20%~28%,而排烟带走的热量占比20%~25%,通过利用垃圾焚烧烟气余热加热一次风,提高垃圾电厂热利用率3%~7%,垃圾电厂的利润率提高5%~8%,具有良好的经济效益。

工业锅炉燃烧烟气余热回收技术研究

工业锅炉是大型工业生产中常见的能源消耗设备,每年耗用原煤约占年总产量的1/3,排放大量的二氧化碳、二氧化硫等,不仅造成环境污染而且其燃烧过程中产生的烟气含有丰富的热能,然而传统的锅炉系统中这部分烟气余热往往被直接排放到大气中,造成了能源的浪费和环境污染。随着能源和环境问题的日益突出,工业锅炉燃烟气余热回收问题受到广泛的关注。科学技术的发展为工业锅炉燃烧烟气余热回收提供了可能性。在分析现阶段工业锅炉燃烧烟气利用现状的基础上,介绍工业锅炉燃烧烟气的特性以及能量分布,探讨较为常见的工业锅炉燃烧烟气余热回收技术,并分析其经济以及环境效益,提高能源利用效率、减少排放、降低能源成本,推动可持续发展和绿色生产。

烧结低品质余热资源高效利用技术研究与应用

为实现烧结余热的充分利用,在环冷机余热发电的同时,采取一系列烧结低品质余热资源高效利用技术,采用高位烟气循环技术,提高烧结机利用系数0.104 t/(m^(2)·h),实现降低燃料消耗3.35 kg/t;采用烟气外循环工艺,在降低脱硫脱硝15%负荷的同时,实现了一氧化碳再氧化及能量利用,燃耗降低0.3 kg/t;采用环冷循环工艺,在减少布袋除尘器负荷的同时,实现了高温烟气再次利用,降低燃耗0.5 kg/t;在烟道安装锅炉,产气量20 t/h,发电量15 kW·h;环冷余热热风点火,降低煤气单耗0.5 m3/t。实践应用表明,通过采取多种措施,实现了烧结余热的有效利用。

甲烷化装置余热回收增加发电机组

大唐国际克什克腾煤制天然气有限责任公司甲烷化装置,在甲烷化反应过程中,原料气经过脱硫和大量甲烷化反应后,经历第一补充甲烷化反应器71-C104后,出口工艺气温度设计操作值为449℃;经过原料气预热器(71-W102/2)、锅炉给水加热器(71-W109)后冷却至169℃;工艺气通过空冷器(71-W201)采用工艺气与空气的换热方式,控制工艺气温度。虽然空冷器具有节约用水量等优点,但仍然有大量热量不能被回收利用,为不将该部分热量浪费,可将其回收利用,以大幅降低装置能耗,节约生产成本。

高水分褐煤发电技术在我国的发展现状与分析

介绍我国褐煤资源特点和褐煤发电技术的发展现状,并分析褐煤锅炉、中速磨制粉系统及设备选型优化、烟气余热利用、烟气提水等褐煤发电关键技术。经分析可知,我国褐煤发电机组在机组参数、能耗水平、环保等方面处于世界领先水平,下一阶段应向着更加高效、绿色的方向发展。

大型社区LNG分布式多联供系统优化分析

为改善能源结构,实现“双碳”目标,以10万人口的大型社区为研究对象,对社区的气、冷、热、电负荷进行预测。根据预测结果,使用EBSILON软件建立包括燃气轮机模块、余热利用模块和制冷模块在内的LNG分布式多联供系统,并对系统进行优化,实现LNG冷能利用、烟气余热利用和背压供冷供热。采用净电效率、第一热效率和效率来评价系统的性能,结果表明,设计工况下该系统上述3种效率均优于其他多联供系统。

陈四楼煤矿水余热利用节能装备技术的研究与应用

本文针对陈四楼煤矿原有传统供暖方式运行中存在的问题,分析了矿井水余热利用系统装备技术运行机理及选型设计,介绍了井筒矿井水余热利用系统装备技术工艺流程、运行特点及效益分析,并对实际应用中的矿井水余热利用效果进行了论证与研究,指出了煤矿生产资源节能装备技术高效利用模式在现代化矿井安全生产中的重要性。

火力发电厂燃煤发电机组烟气余热回收利用技术研究

传统烟气余热回收技术水平较低,换热效率不高,能级匹配也不够合理,导致回收热量低,为此本文进行火力发电厂燃煤发电机组烟气余热回收利用技术研究。首先对烟气余热资源特性参数进行测定,以了解其特性和潜力。其次,确定余热资源的能级,选择合适的回收技术和设备。接下来,安装烟气余热回收装置。最后,通过烟气余热转换热量利用,将烟气中的余热转换为其他形式的能量。实验结果表明:利用火力发电厂燃煤发电机组烟气余热回收利用技术回收热量回收利用热量为19MW,应用价值较高。

提高烧结余热发电量的研究与应用

针对影响烧结余热发电量的原因进行系统的分析和研究,主要研究在现有烧结机各种运行工况下,通过对发电机运行的控制难点进行分析、总结,研究内部、外部环境对提高发电量的影响因素及相关主要事项,并制定解决方法及操作规定,达到提高烧结余热发电量,节能降耗目的。