Technological Transformation For Capacity Expanded In The Caustic Soda Evaporation Unit

Along with the increasing of the chlorine downstream products demand in the domestic market, the problem of demand balance between the caustic soda and chlorine gas is increasingly outstanding. To every chlorine alkali manufacturing enterprise, how to catch the opportunity in great demand of chlorine product market, increase the ability of the plant as soon as possible, solve the resource balance problem of each enterprise as much as possible, it is an important subject that the chlorine alkali manufacturing enterprise faces at present.Honghe chemical Limited Company chlorine alkali system owns 130,000 t/a of the caustic soda unit ability, among them, the diaphragm method production capacity is 80,000 t/a, the ion embrane method production capacity is 50,000 t/a, form a complete set that is 50,000 t/a methane chlorides equipment used hot chlorine method of natural gas, as the downstream process putting into operation of methyl alcohol method methane chloride unit that substitute the carbon tetrachloride unit, the gap of chlorine demand is expanded day by day. Under the background because of the Honghe company is more tense in funds input, combining the great environmental factor that the domestic market of chlorine production raises up, how to advance the capacity of the caustic soda unit to the maximum on the premise of not increasing funds input, promote the chlorine alkali system production, obtain economic benefits, that is an important task for Honghe chlorine alkali factory. But the existing electrolytic ability of chlorine alkali factory can up to 145,000 t/a at full capacity, among them, the diaphragm electrolytic device can reach to produce 95,000 t/a. The designed capacity of the original electrolytic liquid evaporation unit is only 80.000 t/a, as the bottleneck, the running situation of the evaporation device influenced the total unit ability of caustic soda directly. So, optimizing evaporation produce device and increasing the ability of the plant are the key question for the alkali produces.Combined the production technology and equipment technology of the caustic soda evaporation unit, based heat transfer theory, this text propose the concrete measure that optimize the caustic soda evaporation unit and increase the ability of theplant. According to conduct heat theory, improving the ability of the evaporation unit should increase the total heat transfer coefficient and increase transmits heat area or enlarge the effective temperature different. In order to increase the total heat transfer coefficient, combining the theory of intensive heat transfer, this text have analyzed the possibility that the converging diverging tubes used in the caustic soda evaporation unit, confirmed the heater measurement that is suitable for the caustic soda evaporation unit, and carry out the reformation to the B evaporation device successfully; analyze the influence especially that the vacuity produces to the caustic soda evaporation. Then combining the actual situation and theories calculation, propose the optimization for existing vacuum device - - the water jet condenser, has solved the problem that the vacuum of the original condenser is too low before. Thirdly, from the organization and operation, according to the theories calculation for the existing vacuum device, analyze the influence especially that the water amount from outside produce to the evaporation, do research on the centrifugal separator process water, system water and pump water, improve systematizedly on this basis, has reduced the water amount from outside, saved the steam consume, improved the actual ability of the caustic soda evaporation unit.As a result of a series of optimization to the caustic soda evaporation unit, make the production ability from original design of 80,000 t/a to 95,000 t/a gradually. Have realized the goal optimizing tentatively, has met the demand of the existing plant.