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1.电石生产能力明显过剩我国的电石行业现有400多个企业、500多台电石炉,年生产能力达348.88万吨,1993年实际年产量(折300升/公斤)达到234.87万吨。需用电石量最大的产品是聚氯乙烯树脂,需用电石达100万吨;用于金属切割焊接的电石约70万吨,还有少量电石包括加工产品出口,每年约6～7万吨。预计到2000年,电石法聚氯乙烯的生产能力将不会再增长,对电石的需用量将基本保持现有水平;全国切割焊接燃料气体总需用量为22万吨左右,其中丙烯、丙烷约4～5万吨;溶解乙炔占17～18万吨,折合需用电石60～70万吨,比现在用量可能减少5～10万吨。石灰氮包括双氰胺、硫脲等在工业上的需要量将有所增长,以双氰胺为主要
1. Significant excess calcium carbide production capacity China’s calcium carbide industry currently has more than 400 companies and more than 500 calcium carbide furnaces with an annual production capacity of 3,488,800 tons. In 1993, the actual annual production (300 litres/kg) reached 2,427,700 tons. The products requiring the largest amount of calcium carbide are polyvinyl chloride resins, which require 1 million tons of calcium carbide; about 700,000 tons of calcium carbide for metal cutting and welding; and a small amount of calcium carbide, including processed products, which are exported from about 60,000 to 70,000 tons per year. It is estimated that by the year 2000, the production capacity of calcium carbide process PVC will no longer increase, and the demand for calcium carbide will maintain its current level; the total amount of fuel gas for cutting and welding in the country will be about 220,000 tons, of which propylene and propane will 4 to 50,000 tons; dissolved acetylene accounts for 17 to 180,000 tons, equivalent to 600,000 to 700,000 tons of calcium carbide, which may be reduced by 50,000 to 100,000 tons. The demand for lime nitrogen, including dicyandiamide, thiourea, etc., will increase in industry, mainly due to dicyandiamide.