Heat energy recovery device in alkali vaporization station

Abstract

The invention discloses a heat energy recovery device in an alkali vaporization station, which comprises a first evaporator, a second evaporator and a third evaporator. An alkali liquor outlet at the lower end of a first evaporating pot is connected with a raw liquor inlet at the upper end of a second pipe type falling film heater through a first connecting pipe, an alkali liquor outlet at the lower end of a second evaporating pot is connected with a raw liquor inlet at the upper end of a third pipe type falling film heater through a second connecting pipe, and an alkali liquor outlet at the lower end of a third evaporating pot is connected with an alkali tank through a third connecting pipe. The third connecting pipe and the second connecting pipe pass through a first preheater together,the third connecting pipe and the first connecting pipe pass through a second preheater together, and the third connecting pipe and a cooling water pipe pass through a third preheater together. The invention has the advantages that the heat energy of condensed water and that of alkali can be efficiently exchanged during evaporation, the temperature of the condensed water is reduced, and thus, theheat energy of the condensed water is efficiently utilized; meanwhile, the temperature parameter requirements of users are met, the usage of new vapor and cooling water is decreased, and energy consumption is also reduced.

Description

technical field [0001] The invention relates to an alkali evaporation technology, in particular to a heat energy recycling device in an alkali evaporation station. Background technique [0002] The structure of the existing alkali evaporation station for alkali evaporation mainly includes: the first evaporator, the second evaporator and the third evaporator. The first evaporator, the second evaporator and the third evaporator have the same structure and all include Tubular falling film heater and an evaporating tank; the raw liquid inlet at the upper end of the first tubular falling film heater is connected to the raw liquid tank through the liquid inlet pipe, and the secondary steam outlet at the upper end of the first evaporating tank is connected with the steam through the first outlet pipe The condenser is connected, and the lye outlet at the lower end of the first evaporation tank is connected with the raw liquid inlet at the upper end of the second tubular falling film...

AI Technical Summary

Problems solved by technology

The temperature of the alkali sent out from the third alkali pump is very high, and the temperature of the condensed water sent from the condensed water tank is also high. The thermal energy grade of the two is quite high. When the cooling device cools the alkali, it needs to consume a large amount of cooling water, which can The power consumption is high, and the high-temperature condensed water is directly sent out, which does not meet the user's temperature parameter requirements, and the utilization rate of heat and cold is low.

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