Apparatus for concentrating ammonium sulfate slurry by using flue gas enthalpy

Abstract

The invention provides a device for concentrating ammonium sulfate slurry by using the heat enthalpy of flue gas, which includes a tubular heat exchanger (4) connected to the flue of the desulfurization tower, and the bottom of the tube side of the tubular heat exchanger (4) is arranged There is an ammonium sulfate slurry inlet (5), and the top of the tube side of the tubular heat exchanger (4) is provided with an ammonium sulfate steam outlet (6), and the ammonium sulfate steam outlet (6) is connected to the buffer tank (7) The ammonium sulfate steam inlet (8) on the top is connected, and the bottom of the buffer tank (7) is connected with a return pipe (9) for exporting the ammonium sulfate-containing slurry, and the return pipe (9) extends into the crystallization circulation tank (10) At the bottom, a funnel-shaped crystallization tank ring plate (11) is connected to the inner wall of the crystallization circulation tank (10), and the return pipe (9) passes through the crystallization tank ring plate (11). The invention utilizes the heat enthalpy of flue gas to evaporate and concentrate the ammonium sulfate solution, and can produce high-quality ammonium sulfate products without direct gas-liquid contact.

Description

technical field [0001] The invention relates to a device for concentrating ammonium sulfate slurry by using flue gas heat enthalpy, which belongs to the technical field of environmental protection. Background technique [0002] Among the many process routes for flue gas treatment of boilers and kilns, ammonia desulfurization has short process flow, mature process, stable operation, low cost, and small footprint. , so this process is more and more favored by production enterprises, especially enterprises that produce waste ammonia water as a by-product in the production process. [0003] At present, there are mainly two crystallization methods for ammonium sulfate produced by ammonia desulfurization. One is saturated crystallization in the tower. Using the heat enthalpy of the flue gas, the flue gas directly contacts the ammonium sulfate slurry in the desulfurization tower, and the high-temperature flue gas evaporates the water in the slurry. , reach a saturated state, the s...

AI Technical Summary

Problems solved by technology

Disadvantages: large investment, high operating cost, need to consume a lot of steam, and the cost of producing one ton of ammonium sulfate increases by about 200~300 yuan

[0005] The above two crystallization methods have their own advantages and disadvantages. The disadvantage of saturated crystallization is: the quality of ammonium sulfate product is poor; the disadvantage of evaporation crystallization is that it consumes a lot of energy; its disadvantages also limit the further promotion of ammonia desulfurization process to a certain extent.

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