SNCR/SCR混合技术在220t/h循环流化床锅炉上的应用

为应对"超低排放"新一轮的质量浓度为50 mg/m~3(以φ(O_2)=6%为基准)的NOx排放要求,针对项目中的220 t/h循环流化床锅炉的排放状况进行脱硝改造,选择了SNCR/SCR混合技术,成功实现了NOx质量浓度从300mg/m~3到50 mg/m~3的脱除目标,氨逃逸小于3×10-6(质量分数),取得了很好的应用效果。     

掺烧30%高炉煤气锅炉电除尘器达标改造

兴澄特钢热电厂一台SG-240/9.8型掺烧30%高炉煤气锅炉,原有电除尘器排放为50 mg/m~3,经过改造,满足环保排放≤20 mg/m~3的检验要求。     

矿用燃煤锅炉废气治理

燃煤锅炉在矿山生产中应用广泛,并发挥重要作用,但其产生的废气中含有烟尘、二氧化硫和氮氧化物等有害物质,破坏生态环境,威胁人类健康,加强燃煤锅炉废气治理具有重要意义。介绍了乌山铜钼矿燃煤锅炉废气治理技术,包括布袋除尘、强碱脱硫和SNCR脱硝。治理后的废气中烟尘2.57 mg/m~3、二氧化硫266.15 mg/m~3、氮氧化物295.91 mg/m~3,分别低于新建锅炉大气污染物排放标准50 mg/m~3、300 mg/m~3和300 mg/m~3,具有良好的经济效益和环境效益,为同类矿山燃煤锅炉废气治理提供参考。     

工艺参数对烧结燃料NO_x排放浓度的影响

研究了工艺参数对烧结燃料NO_x排放浓度的影响规律。研究结果表明:随着烧结温度的升高,烧结燃料NO_x的平均浓度先升高后降低,当烧结温度在1 100℃左右时,氮氧化物的平均浓度达到最大值。随着高温恒温时间的延长和升温速率的增大,烧结燃料NO_x的平均浓度均出现降低趋势,分别由87 mg/m~3和91 mg/m~3降低到77 mg/m~3和80 mg/m~3。在氧含量低于21%时,NO_x的平均浓度随着氧含量的升高而升高。NO_x的排放浓度主要取决于烧结生产中氮氧化物的生成及被还原程度。因此,烧结生产中可通过控制烧结温度、增大升温速率、延长高温时间或降低含氧量等方式抑制NO_x的生成或促进其还原,进而降低烧结烟气中NO_x的排放量。     

火电厂锅炉炉内低氮燃烧运行优化试验研究

为提高火电厂锅炉炉内的燃烧效率,同时降低NO_x排放浓度,采用正交试验和极差分析法,对锅炉低氮燃烧运行进行试验研究。结果表明：煤质对锅炉燃烧效率的影响最大,低硫煤比高硫煤的平均燃烧效率提升了0.44%;第3/4层SOFA开度对炉膛出口NO_x浓度的影响最大,当第3/4层SOFA开度由60%增至100%时,NO_x浓度将减小15.35 mg/m³;在最优运行方案下,锅炉平均燃烧效率将提升0.39%,可节约供电标煤耗约1.38 g/(kW·h),炉膛出口NO_x浓度平均可降低14.49 mg/m³。     

国内首套铝用碳素ASC烟气干式超净技术装置在天山铝业成功应用

正天山盈达ASC干式超净项目是我国首台铝用烟气干式超净项目,脱硫除尘部分于2017年5月开始土建施工,8月1日建成并一次性成功投运,出口排放SO_2小于35 mg/m~3、粉尘小于5 mg/m~3,达到超净排放标准,同步建设的SCR脱硝部分也投运,可以满足NO_x小于50 mg/m~3,最终实现优于火电锅炉     

造纸白泥旋流雾化脱硫除尘一体化技术试验研究

针对造纸行业烟气超低排放要求,以某造纸企业燃煤锅炉为例,运用造纸白泥作为单一脱硫剂,采用旋流雾化脱硫除尘一体化技术进行烟气超低排放处理,分析运行方式、入口烟气温度、吸收塔内pH值等参数对脱硫效率和除尘效率的影响。结果表明:采用造纸白泥作为单一脱硫剂的情况下,应用旋流雾化脱硫除尘一体化技术,可以在脱硫单塔、无额外湿电除尘设备的条件下实现出口烟气SO_2浓度稳定低于35 mg/m~3,粉尘浓度不超过5 mg/m~3的超低排放指标;旋流雾化层全部投运的情况下,平均脱硫效率可达99.51%,平均除尘效率高达94.12%,可以实现造纸厂废料资源综合利用。     

低氮节能生物质层燃锅炉的设计及其热工性能

为提高生物质层燃锅炉的节能环保水平,根据生物质成型燃料的高挥发分化学特性,提出大弧形炉拱、大炉膛容积的结构设计,同时采用分段精准控制技术控制预热段、主燃段、燃尽段燃烧。并对设计研发的锅炉开展热工性能试验,结果表明：NO_x基准排放质量浓度控制到89.27 mg/m³,与传统型生物质低氮燃烧锅炉相比,NO_x排放浓度降低了20%;基于出水温度折算,燃料修正的锅炉热效率为86.69%,锅炉节能热效率指标达到国家标准规定的二级能效水平。     

低速循环流化床锅炉超净排放改造工艺应用研究

针对低速循环流化床锅炉超净排放改造工艺要求,基于锅炉结构特点和运行情况,分析了改造前该炉型锅炉运行中存在的问题。在锅炉性能优化的基础上,提出更换省煤器和管式空预器,留出空间将SCR反应器布置在锅炉尾部受热面,利用SNCR过量分解的氨作为脱硝还原剂;除尘采用“布袋除尘器+管式除雾器+湿式电除尘”工艺确保全负荷工况下颗粒物稳定达标排放;脱硫系统基于提高液气比,对原有脱硫塔本体和基础进行改造。运行后表明,锅炉最大出力提升20%,颗粒物排放质量浓度在3 mg/m³附近,SO₂质量浓度在10 mg/m³以内,NOx质量浓度在15 mg/m³以内。     

铜冶炼制酸尾气深度净化处理技术

本文介绍了铜冶炼制酸尾气深度净化处理技术及采用的工艺流程和主要设备。采用新型脱硫塔这种集脱硫、增湿、电除雾于一体的烟气深度净化装置处理制酸尾气后,尾气中SO_2浓度小于100mg/m~3、颗粒物浓度小于10 mg/m~3、酸雾浓度小于20 mg/m~3。新型脱硫塔有效解决了传统象法脱硫中SO_2排放浓度不稳定及酸雾、颗粒物排放浓度超标问题,具有广阔的应用前景。     

转炉炉壳热应力分析

根据实际转炉建立实体模型。以有限元为手段,考虑了炉衬和炉壳材料的物性参数随温度变化的特点和炉衬与炉壳之间膨胀间隙,计算了转炉炉壳在温度载荷和炉衬膨胀压力同时作用下的热应力。所得结果可为转炉炉壳设计提供依据。     

焦炭热性能指标意义浅析

通过对焦炭在高炉内的历程及其变化规律的剖析,阐述焦炭热性能指标的意义,形象地把焦炭在高炉内的损耗分为三部分(M1,M2,M3)。指出M2对焦比及焦炭价格有一定的指导作用。     

Results of treatment of cancer of the cardia

Cancer of the cardia is traditionally discussed with cardiac cancer of the lower portion of the esophagus and upper gastric cancer invading the esophagus, and the specific characteristics of cancer of the cardia have never been clearly defined. We reviewed the outcome of 172 patients with adenocarcinoma of the cardia who had undergone radical surgery between 1949 and 1994 in the Division of Gastrointestinal Surgery of the Cancer Institute Hospital. The centers of the tumors were located within 2 cm above and below the boundary between the esophagus and the stomach, and their longitudinal diameter was less than 8 cm. We divided the patients into an early period (1949-1979; n = 79) and a late period (1980-1994; n = 93), and focused on the historical transition. There were no differences in patient gender or histology between the two periods. However, the late period was associated with fewer cases of esophageal invasion and shorter longitudinal diameter, as the age of the population advanced. The number of advanced cancers such as the localized and infiltrative type had decreased, and early cancer and early clinical stage had become more common, but despite the fact that the number of early cancers had increased, extended dissection, such as thoracic and paraaortic lymph node dissection, was performed more frequently. By clinical stage, the long-term outcome markedly improved in Stage I patient in the late period, and tended to improve in Stage II and III patients. This appears to have been attributable to the prevention of micrometastasis by extended dissection, although the number of early cancers is another major potential cause. There were no differences in the outcome of Stage IV patients between the two periods, and further advances in multimodality therapy must be awaited. The range of resection is basically proximal gastrectomy, and if there are adequate indications, the prognosis is favorable. In view of the status of lymphatic flow and lymph node metastasis, and long-term results, lateroaortic lymph node dissection is important. Since the number of early cancer patients has been increasing, if intraabdominal recurrence is prevented, intrathoracic lymph node dissection will contribute greatly to the outcome of such patients.     

Effect of antibiotics of chemotaxis of human leukocytes

The effect of 20 different antibiotics on chemotaxis by human neutrophils was studied. Human leukocytes incubated with chloramphenicol, rifampin, sodium fusidate, and tetracyclines in vitro showed markedly depressed migration. The mechanisms by which these antibiotics affect leukotaxis are discussed.     

Quality of life of relatives of mental patients

Usage of quality of life of psychiatric patients' relatives as the parameter of estimation of the quality of psychiatric care is considered. By means of standard questionnaire elaborated by the authors as well as by means of both individual and group conversations the quality of life was analyzed in 40 relatives which lived together with psychiatric patients. Different spheres of their life and difficulties (financial, social-psychologic, production) were examined in families with such patients. The defects of psychiatric care that had direct influence on the quality of life of the psychiatric patients' relatives are outlined.     

The effect of amount of possession of the trait of hostility on accuracy of perception of hostility in others.

Some theories of personality hold that an individual's perception of others is influenced by his own personality characteristics; more specifically, that a trait of low social value will be projected more into others, and that insight into the possession of these characteristics reduces this distortion. These 2 hypotheses were tested by having a group of college students rate each other (including themselves) on degree of friendliness or hostility. Agreement with group rating about self yielded the insight score. In general, the hypotheses were supported; the "friendly" Ss were most accurate in their perception of others, and insight was positively associated with accurate perception. From Psyc Abstracts 36:04:4HL16M. (PsycINFO Database Record (c) 2010 APA, all rights reserved)