在1983年10月之前,我厂生产电杆,全部采用露天内通式蒸汽养护,蒸养时间4～6小时,电杆混凝土脱模强度只达设计强度的65%左右,平均每根电杆耗标煤68.7公斤,比江苏省建材局规定每根电杆耗标煤47公斤,超耗46%。为了解决这一问题,我们总结以往的经验教训,取露天蒸养和坑式蒸养之长,并参阅国外一些资料,设计制造了目前使用的这座热介质定向循环蒸养窑,对水泥电杆等空心制品进行窑内蒸养。使窑内介质沿着一定方向、一定路线在电杆圆孔内外往复循环,保留了原来露天蒸养工艺中介质流动的优点,改制品单面受热为双面受热,缩短了蒸养时间。集坑式蒸养工艺中有保温围护设备,改介质静态蒸养为介质动态蒸养,克服了窑内介质分层现象,强化了热量交换速度,稳定了产品质量,节省了煤耗。 Before October 1983, our factory produced poles, all of which were maintained in open-air steam. The steaming time was 4 to 6 hours. The strength of the concrete demoulding of the poles was only about 65% of the design strength. Each pole was averaged. Consumption of 68.7 kg of standard coal, compared with the Jiangsu Provincial Building Materials Bureau stipulates that each pole consumes 47 kilograms of coal and consumes 46%. In order to solve this problem, we summarize the lessons learned from the past, take the lengths of open-air steaming and pit-type steaming, and refer to some foreign materials to design and manufacture the currently used hot medium oriented circulating steaming kiln. Hollow products such as rods are steamed in the kiln. The kiln medium is circulated back and forth along a certain direction and a certain route in the inside and outside of the electric pole circular hole, which retains the advantages of the medium flowing in the original open steam curing process. The modified product is heated on one side to double-sided heating, shortening the steaming time. There are thermal insulation enclosure equipment in the pit-type steaming process. The medium is changed from static steaming to dynamic steaming, which overcomes the layering phenomenon in the kiln, strengthens the heat exchange rate, stabilizes product quality, and saves coal consumption.