一、简况我厂年产24万吨尿素工程的尿素造粒塔于1975年建成。该塔直径16米,高度71米,全部采用高标号普通钢筋混凝土结构,并使用滑模技术连续浇捣施工。塔壁厚度为200毫米。为了防止投产使用时高温熔融的尿素对混凝土造粒塔内壁的腐蚀,在塔体滑模施工时,混凝土内掺入相当于普通硅酸盐水泥用量0.5%重量的NNO密实剂(萘磺酸盐),以提高混凝土塔体的密实度,增加其抗渗性能。在滑模施工时,为防止在露天条件下混 First, the briefing I plant with an annual output of 240,000 tons of urea project urea granulation tower built in 1975. The tower diameter of 16 meters, a height of 71 meters, all using high standard ordinary reinforced concrete structures, and the use of sliding mode continuous pouring pound construction. The thickness of the tower wall is 200 mm. In order to prevent the use of high temperature melting urea melt on the inner wall of concrete prilling tower corrosion in the sliding formwork construction, the concrete incorporation of ordinary Portland cement 0.5% by weight of NNO densifier (naphthalene sulfonate ), In order to improve the density of concrete tower body, increase its impermeability. In slipform construction, to prevent mixing in open conditions