Ionic membrane caustic soda first-effect evaporation device and method

Abstract

The invention relates to an ionic membrane caustic soda first-effect evaporation device and method. The ionic membrane caustic soda first-effect evaporation device comprises a first-effect evaporator, a condensate water tank, a first-effect separator, a second-effect separator, a first-section preheater and a second-section preheater. The first-effect evaporator is a tubular falling film evaporator, a feed liquid inlet is formed in the top of the evaporator and connected with a feed liquid input pipe, a concentrated liquid outlet is formed in the bottom of the evaporator and connected with a concentrated liquid output pipe, a steam inlet is formed in the middle of the evaporator, tail gas discharge outlets are formed in the upper and lower parts of the evaporator, and a condensate water discharge outlet is formed in the bottom of the evaporator. The steam inlet is connected with a steam pipeline from a boiler, and the condensate water discharge outlet is connected with a condensate water output pipe. The first-effect evaporator is high in safety, a sealing gasket is not needed, and accidents caused by gasket leakage are avoided.

Description

technical field [0001] The invention relates to an ionic membrane caustic soda one-effect evaporation device and method, belonging to the technical field of caustic soda evaporation. Background technique [0002] The caustic soda evaporation process includes cauldron method, multi-effect co-current or counter-current natural circulation method, single- and double-effect rotary film method, multi-effect co-current or counter-current plate evaporation. The transmission force of the traditional evaporation process is 0.8MPa, 180°C (index 0.75- 0.85Mpa, 178-185℃), the first-effect evaporator adopts a plate evaporator, and under the conditions of the highest steam pressure, temperature, and alkali concentration, due to the aging and corrosion of the gasket, the leakage between the plates is caused. As a result, the evaporation system cannot operate normally, or the temperature of the discharge lye needs to be strictly controlled, and the concentration of the final product cannot ...

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Problems solved by technology

[0002] The caustic soda evaporation process includes cauldron method, multi-effect co-current or counter-current natural circulation method, single- and double-effect rotary film method, multi-effect co-current or counter-current plate evaporation. The transmission force of the traditional evaporation process is 0.8MPa, 180°C (index 0.75- 0.85Mpa, 178-185℃), the first-effect evaporator adopts a plate evaporator, and under the conditions of the highest steam pressure, temperature, and alkali concentration, due to the aging and corrosion of the gasket, the leakage between the plates is caused. As a result, the evaporation system cannot operate normally, or the temperature of the discharge lye needs to be strictly controlled, and the concentration of the final product cannot reach 50%, only about 46%.

[0003] For a long time, most companies in the industry have been trying to overcome this problem, but they have not made substantial progress. They can only maintain production by regularly replacing gaskets and plates. The running time of the equipment is short and frequent maintenance is required, resulting in high maintenance costs. , affecting the production capacity of the device, resulting in a decline in production capacity

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