Taking some tubular air pre - heater used in one boiler whose capacity is 130 t / h as an example , new blue print with inner trachea is completed by means of computer program . several key design variables may be changed , such as diameter of pipe and velocity of flow of gas . these cases have been considered , and their results have also been compared with each other 比较了几个重要的设计变量，如外管径、烟气流速等参数变化时，总传热系数和空预器本体管子总重量，阻力损失以及最低管壁温度等几个重要设计结果的变化趋势，对内螺纹管空气预热器的设计具有借鉴意义；其间还分析了内螺纹管与光管在设计时的不同之处；最后，初步分析了内螺纹管的优化设计问题，提出了一些建议。
This article is the schedule design of the project , are as follows : it is introduced the basic condition of company , the reason of project building , expecialy introduced the good value in manstrength ensure , filed of plant , traffic , pipe rack and maintenance etc of jilin chemical fiber group co . , ltd . it is the analys of product market and price 本文将对该工程项目进行方案设计,具体内容如下:第一章介绍项目建设单位基本情况、项目背景及建设理由,重点陈述吉林化纤集团有限责任公司在人力资源、装置用地、交通运输、外管网、维修设施等方面的优势;第二章对项目方案设计所采用的理论方法做了简要的介绍。
The exit in getting sheet of paper cancel after verification to enter electronic port closes collect / port puts on record in undertake port puts on record , put on record can declare at customs after the success , the exit in electronic port is being entered after goods exports custom to print a customs declaration closes collect / the enterprise is handed in sheet is made in sheet , cancel after verification of bureau of 3 days of or so outside going canals after only success is handed in below affection condition commonly , if involve drawback to hand in sheet to also can enter the exit drawback in electronic port at the same time / datagram sends in do a newspaper to send , after usually the newspaper sends a success , declare dutiable goods the country can go after declaring duty does drawback 领完纸质核销单进入电子口岸中的出口收汇/口岸备案中进行口岸备案，备案成功后就可以去海关报关，货物出口海关打印出报关单后进入电子口岸中的出口收汇/企业交单中交单，一般情况下交单成功后3天左右去外管局核销，如涉及退税交单同时也可以进入电子口岸中的出口退税/数据报送中做报送，一般情况下报送成功后报税申报后可以去国税办退税。
Get sheet of cancel after verification to enter exit to close collect / port puts on record in undertake port puts on record , put on record can declare at customs after the success , exit is entered to close after goods exports custom to print a customs declaration collect / the enterprise is handed in sheet is made in sheet , cancel after verification of bureau of 3 days of or so outside going canals after only success is handed in below affection condition commonly , if involve drawback to hand in sheet to also can enter exit drawback at the same time / datagram sends in do a newspaper to send , usually the newspaper sends success hind 5 days or so to be able to go duty runs the country drawback 领完核销单进入出口收汇/口岸备案中进行口岸备案，备案成功后就可以去海关报关，货物出口海关打印出报关单后进入出口收汇/企业交单中交单，一般情况下交单成功后3天左右去外管局核销，如涉及退税交单同时也可以进入出口退税/数据报送中做报送，一般情况下报送成功后5天左右可以去国税办退税。
