蒸汽锅炉的蒸汽空间和锅炉的水容积有关系吗? 汽包的容积怎么确定？锅炉与汽包之间可以用法兰连接吗？ steam drum sizing a. the inside diameter shall be not less than 910 mm (36") to allow room for access and steam drum internals. b. the steam space shall be adequately sized to contain steam separation equipment necessary to attain the guaranteed steam purity specified throughout the control range. c. the water holding capacity between the different water levels, (ex. nwl (normal water level), lwl (low water level), llco (low level cut off), and hwl (high water level)) shall be reviewed to evaluate the affect of evaporation at mcr with no feedwater flow. the typical steam drum water retention time between the normal water level (nwl) and the low level cut out (llco) is between one and two minutes at mcr with no feedwater flow. d. the llco shall be located above the top of the highest downcomer. e. a rise in water level (swell) above the nwl resulting from the requirements specified shall not cause a carryover or actuation of the hlco (high level cut off) if hlco is employed. f. a fall in water level (shrinkage) below the nwl resulting from the requirements specified shall not cause the actuation of the llco. pipe sizes of 1¼ inch, 5 inch, and 7 inch nps shall not be used. a manway shall be provided at both ends of steam and water drums and provided with hinged covers or davits.查看更多
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