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1.前言 在我国中小容量的锅炉中,锅壳式卧式外燃型锅炉占了极大部分,有蒸汽锅炉,也有热水锅炉。由于该类锅炉的结构特点,其中热水锅炉在运行过程中,发生了后管板裂纹等严重威胁安全运行的缺陷。为此,劳动部在1991年发布的《热水锅炉安全技术监察规程》（以下简称《新规程》）第26条规定:“对于锅壳式卧式外燃锅炉,设计、制造单位必须采取技术措施,解决管板裂纹或泄漏及锅壳鼓包等问题”。对于上述问题,我们厂做了一定的试验研究工作。早在1984年,我厂就与上海机械学院合作,进行了锅壳式卧式外燃热水锅炉水动力模化试验研究（以下简称《模化试验》）,并取得了满意的结果。该《模化试验》的成果获得了上海市第二轻工业局科技进步一等奖。根据《模化试验》的成果,我厂在1985年研制开发了DZL1.4—0.7/95/70一AⅡ链条炉排热水锅炉。在该锅炉的本体结构中,采用回水引射和低
1. Introduction In China’s small and medium volume boilers, shell type horizontal external combustion boiler accounted for a large part, a steam boiler, but also hot water boiler. Due to the structural characteristics of these types of boilers, the defects in the safe operation of the hot water boiler, such as the cracking of the rear tube plate, are serious threats to the operation of the hot water boiler. To this end, the Ministry of Labor released in 1991, “Hot Water Boiler Safety Technology Supervision Regulations” (hereinafter referred to as the “new rules”) Article 26: “For the shell and shell horizontal external combustion boiler, the design and manufacturing units must take the technology Measures to solve the tube plate cracks or leaks and drum bulge and other issues. ” For the above problems, we plant a certain amount of experimental research. As early as 1984, our factory cooperated with Shanghai Mechanical Engineering Institute and carried out the hydrodynamic model test and research (hereinafter referred to as “mold test”) of the shell and shell horizontal external-combustion hot water boiler, and achieved satisfactory results. The results of this “mold test” won the first prize of science and technology progress of Shanghai Second Light Industry Bureau. According to “mold test” results, I plant in 1985 developed a DZL1.4-0.7 / 95/70 a A chain grate hot water boiler. In the boiler body structure, the use of backwater injection and low