Sulfuric Acid At Low Temperature Waste Heat Utilization The Design And Implementation

Pyrite in the combustion process produces a large amount of waste heat, there is a great value, especially in the conversion and cleaning section, mainly is the medium temperature waste heat (400 ?) and low temperature waste heat (200 ?), the use of this part of the waste heat, can produce more steam. Through the conversion of waste heat exchanger removed and not be recycled; Cleaning section of waste heat by dilute acid,dilute acid washing plate heat exchanger to heat, heat is not only no use, also waste a lot of water, electricity and other resources used for cooling. With the progress of science and technology, low temperature waste heat recovery unit in sulfuric acid industry booming,xiangyang ze east chemical industry group co., LTD. The pyrite acid of low temperature waste heat recovery unit is one of them.Xiangyang ze east chemical group co, LTD,built in 2010?150000 tons/year pyrite acid device, the device of new type heat pipe economizer 2 units, recycling and cleaning section of low grade waste heat.The technology is to use the coal saving device, using the characteristics of high heat transfer and low corrosion to recover the waste heat.For ordinary economizer, tube wall temperature once more than 140 DEG C, it will produce SO3 flue gas dew point corrosion.Therefore, it is necessary to use advanced heat pipe economizer.In view of the thermal tube element characteristics make and furnace gas in contact with the metal wall temperature in the normal operation of higher than the dew point temperature of the sulfur trioxide,avoiding the dew point corrosion.General technology reform scheme is proposed in this paper, combined with the actual operation parameters, on the low temperature waste heat, recovery system heat balance analysis, the key equipment in the accounting, the arrangement of the equipment.Benefits after the innovation was analyzed, and the recovery of pyrite acid transformation and cleaning section of low temperature waste heat, 150,000 tons / year pyrite acid plant,the annual new 3.82MPa, 450 ? steam 33,800 t, used in dry products, greatly reduce outsourcing steam, at the same time reduce consumption of circulating water and supplement water and electricity consumption, reduce the waste emissions, is conducive to environmental protection. Realize the energy-saving benefit RMB4.30 million per year,with remarkable energy conservation and emissions reduction and economic and social benefits.Now with pyrite acid low temperature waste heat recovery technology, does not affect the output of the existing production system, festival energy 3851 tce, illustrate the pyrite acid of low-temperature waste heat recovery technology with high level, project transformation was a success.