A method and device for combined thermal energy recovery of thermal phosphoric acid and polyphosphoric acid micro-absorption

Abstract

The invention discloses a heat energy recovery method for combining heat-process phosphoric acid and polyphosphoric acid micro absorption and a device thereof. According to the method, a micro absorption heat exchanger is used for recovering heat of reaction heat of phosphorus pentoxide and water; the heat of furnace slag is recovered through a furnace slag heat recovery device; the recovered heat of the reaction heat and the heat of the furnace slag are simultaneously connected into an air heat exchanger to prepare hot soft water; the hot soft ware is conveyed to a yellow phosphorus furnace and a phosphorus furnace tail gas boiler through pipelines for overheating steam; through combining the reaction heat, the furnace slag heat, the byproduct tail gas combustion heat and the yellow phosphorus combustion heat, the efficient recovery and utilization of the heat energy is realized. The goals of producing heat-process phosphoric acid or polyphosphoric acid by low energy consumption and recovering the combustion heat of the byproduct tail gas of the yellow phosphorus, the combustion heat of the yellow phosphorus, the reaction heat of phosphorus pentoxide and water, the solidification heat and the sensible heat of the furnace slag at the same time can be achieved; the recovery efficiency is high; the energy sources can be favorably saved; the production cost is effectively reduced.

Description

technical field [0001] The invention relates to a method and a device for micro-absorption combined thermal energy recovery of thermal phosphoric acid and polyphosphoric acid, and belongs to the technical field of low-energy production thermal phosphoric acid or polyphosphoric acid technology and the comprehensive recovery and recovery of heat energy in the production process. Background technique [0002] Phosphoric acid is an important chemical intermediate product, and it is a common raw material for the synthesis of most phosphates and some phosphoric esters and other phosphorus compounds. It is widely used in food, medicine, electronics, petroleum, metallurgy, chemical industry and other industries. According to the production process, The sources of phosphoric acid are wet process phosphoric acid and hot process phosphoric acid. Wet-process phosphoric acid uses strong acid—usually sulfuric acid, but also nitric acid, hydrochloric acid, fluosilicic acid and phosphate ro...

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Problems solved by technology

[0006] Invention patent CN102910602A double-zone high-efficiency recovery of yellow phosphorus combustion heat energy device proposes a heat energy recovery device similar to a phosphorus-burning boiler, without considering the recovery of high-temperature tail gas heat energy and hydration reaction heat

Therefore, the temperature of the material in the absorption process must be increased, which in turn requires the selection of more expensive equipment materials

For large equipment, material upgrade means increased investment in equipment, which will weaken the benefits of heat recovery

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