Split-type final-effect evaporator with water cooling function

Abstract

The invention relates to a split-type evaporator. The split-type evaporator comprises a tubular falling film heater. A solution inlet is arranged at the upper end of the tubular falling film heater, the lower end of the tubular falling film heater is connected with a separator through a connecting pipe, a secondary steam outlet is arranged at the upper end of the separator, and a solution outlet is arranged at the bottom of the separator. A vertical water cooler is connected to the upper end of the separator, a circulating water feed inlet is formed in the upper portion of the water cooler, and a circulating water discharge outlet is formed in the side wall of the lower portion of the water cooler. A retaining plate covers the secondary steam outlet, and the retaining plate and the secondary steam outlet are arranged separately. Secondary steam flashed out by the separator directly enters the water cooler through the secondary steam outlet to be absorbed by circulating water, the low-pressure state in the separator is kept continuously, and accordingly, the evaporation efficiency is greatly improved.

Description

Technical field: [0001] The invention belongs to the technical field of evaporators, in particular to a split-type final-effect evaporator with water cooling function. Background technique: [0002] The temperature of the secondary steam in the final effect evaporator of the tubular falling film evaporator group is very low and cannot be used to heat other devices. Generally, it is condensed and absorbed by the circulating water in the water cooler. The original configuration form is to separate the final effect evaporator and the water cooler side by side (that is, the final effect evaporator and the water cooler are two single devices), and the secondary steam of the final effect evaporator is introduced into the water cooler through the steam connection pipe. Practice has proved that there are the following main problems in this split-parallel configuration: [0003] (1) Due to the low temperature of the final secondary steam (~50°C) and the final vacuum condition (absol...

AI Technical Summary

Problems solved by technology

[0003] (1) Due to the low temperature of the final secondary steam (~50°C) and the final vacuum condition (absolute pressure ~0.012MPa), the secondary gas density is very small, about 0.083kg / m 3 , but the volume is very large, and the pipe connection is adopted. The resistance of the pipe will have a greater impact on the flow of the secondary steam, resulting in poor gas flow; at the same time, a considerable part of the secondary steam that causes the final effect is always stranded in the final It cannot be discharged quickly in the separation chamber of the efficiency, and the above factors will seriously reduce the evaporation efficiency of the final effect.

[0004] (2) The secondary steam of the final effect is drawn from the side wall of the separation chamber of the final effect evaporator by opening an opening, so that the secondary steam flashed from the liquid surface of the separation chamber will easily flow to the opening of the pipe Concentrated flow, resulting in a large concentration of gas on this side; the demisters evenly arranged along the circumference of the separation chamber cannot effectively demister at the same time, and the work load of the demister near the secondary steam outlet is too heavy, making the secondary steam The demister near the steam outlet wears quickly, which reduces the service life; the actual situation is that a considerable part of the secondary steam enters the water cooler without vapor-liquid separation, resulting in alkali in the final secondary steam, which makes the alkali content of the circulating cooling water increase, affecting the subsequent use of circulating water, while increasing alkali loss and increasing production costs

Images