Recovery and treatment system for acid-making sulfur-melting vapor exhaust and condensate of acid-making sulfur-melting vapor exhaust

Abstract

The invention discloses a recovery and treatment system for acid-making sulfur-melting vapor exhaust and condensate of the acid-making sulfur-melting vapor exhaust and belongs to the technical field of waste heat recovery. The recovery and treatment system comprises booster pumps, spray towers, vapor-water separators, vapor-vapor extraction pipes and the like, wherein the booster pumps and the spray towers are connected in series in sequence; the spray towers communicate with the vapor-water separators respectively; and the vapor-water separators communicate with vapor pressurization machines respectively. According to the technical scheme, the heat energy of high-temperature vapor exhaust as well as the heat energy of saturated condensate of the high-temperature vapor exhaust is sequentially recovered in three stages, namely a high-temperature stage, a medium-temperature stage and a low-temperature stage; then the vapor exhaust recovered in the medium-temperature stage and the low-temperature stage is heated and pressurized through the vapor-vapor extraction pipes and then is mixed with the vapor exhaust recovered in the high-temperature stage; next, the pressure and temperature of saturated vapor are enabled to be close to parameters of a main-pipe vapor source through two-stage heating and pressurization of the vapor pressurization machines and are kept stable; and finally high-temperature and high-pressure vapor is collected into an original main vapor pipe to be recycled, and the cycle repeats. Therefore, the recycling of the waste heat is realized to the greatest extent, the recycling quality of the waste heat is greatly improved, the consumption of original fresh vapor is reduced, and energy is saved.

Description

technical field [0001] The invention belongs to the technical field of waste heat recovery, and relates to a technology for environmentally friendly recovery and discharge of waste heat generated in sulfur and pyrite acid production, and in particular to a recovery and treatment system for acid molten sulfur waste steam and its condensed water . Background technique [0002] Compared with pyrite acid production, sulfur acid production has the characteristics of fewer procedures, short process, high sulfur utilization rate, more by-product steam, low power consumption, and less "three wastes". Therefore, sulfur acid production is a very competitive At present, sulfur acid production is developing rapidly in China. However, after many years of practical operation in domestic sulfur acid production, some problems of sulfur acid production have been exposed one after another. For example, the sulfur melting system of sulfur acid production needs to use a large amount of satura...

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Problems solved by technology

Due to the relatively low pressure of the exhaust steam generated by the sulfur melting system, and the distance between the sulfur acid plant and the sulfur melting system is not conducive to transportation and recovery, it is very difficult to recycle a large amount of extremely low-quality exhaust steam, so it can only be emptied on site , the exhausted steam discharged into the atmosphere forms fog, which causes great visual environmental pollution to the molten sulfur area, resulting in heavy moisture on the surface of the equipment, and unclear sight of personnel and vehicles, especially in winter

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