An energy recovery system for ammonium phosphate production system

Abstract

The present invention discloses an energy source recovery system for ammonium phosphate production. The energy source recovery system comprises a first heat exchanger, a temperature reducing device, a condensed water tank, a phosphoric acid circulating pump, a hot acid flash evaporation chamber, a second heat exchanger, a third heat exchanger and a hot acid middle tank, wherein the lower end of the first heat exchanger is respectively connected to the outlet pipe of the phosphoric acid circulating pump and the water inlet pipe of the condensed water tank, the upper end is respectively connected to the outlet pipe of the temperature reducing device and the inlet pipe of the hot acid flash evaporation chamber, the temperature reducing device is connected to the condensed water tank through a temperature reducing water pipe, the inlet pipe of the phosphoric acid circulating pump is connected to the outlet pipe of the hot acid middle tank, the outlet pipe of the phosphoric acid circulating pump is connected to the lower inlet pipe of the first heat exchanger, both sides on the upper portion of the hot acid flash evaporation chamber are respectively connected to the acid outlet pipe of the first heat exchanger and the upper portion sealing head acid outlet pipe of the second heat exchanger, and the top portion gas outlet pipe of the hot acid flash evaporation chamber is connected to the upper portion of the third heat exchanger sequentially through a re-blocking foam removing device and a pressurization device. With the energy source recovery system of the present invention, the exhaust steam energy quality is effectively re-utilized, and the production cost is substantially reduced.

Description

technical field [0001] The invention belongs to the technical field of energy saving and environmental protection for phosphate fertilizer production, and in particular relates to an energy recovery system used in an ammonium phosphate production system. Background technique [0002] At present, domestic large-scale phosphate fertilizer enterprises can generally recycle high and medium temperature heat energy in the production process of sulfuric acid, and the average utilization rate of heat energy is about 60%. However, the utilization of low heat energy in the ammonium phosphate system is not too high, mainly It is because it is easy to cause system blockage and corrosion, which limits its popularization and application. Therefore, the low-level heat energy in the ammonium phosphate system has not yet been developed and utilized in large quantities. For example, the steam from the steam main pipe must be reduced in temperature and pressure to enter the phosphoric acid con...

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Problems solved by technology

This not only causes environmental pollution, but also causes a lot of energy waste

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