... all over the use of oil refineries, chemical plants, fertilizer, urea plant, coking plant by-products (waste) such ... fuel oil, the huge number, inexpensive and easy to buy. Such a large amount of waste oil each ... or recycle, or the view for the producers to bring great benefits, are very suitable choice. Shangqiu ... steam, oil and gas through the condenser, liquid can be part of the condensate for oil, ...