A central circulation tube evaporator

Abstract

The invention relates to the technical field of evaporators, and discloses a central circulation tube evaporator, which includes a cylinder wall. The central circulation tube evaporator changes the traditional circular heating tube bundle into a hexagonal heat exchange wall, and The heat exchange wall gradually shrinks from the cylinder wall to the central circulation pipe. The hexagonal solution heating chamber a changes the traditional cylindrical heating tube and increases the volume of the solution heating chamber a, and the shape of the chamber is regular. It greatly facilitates the cleaning of the solution heating chamber a in the later stage. Compared with the existing circular heating tube, the solution heating chamber a composed of adjacent heat exchange walls greatly increases the carrying capacity of the solution. The heated steam chamber b heats it, and through the rapid heat exchange between the internal large-capacity solutions, the solution can absorb more heat and the heat inside the solution does not reach saturation, which increases the heat of the steam chamber b heated in a single cycle Exchange efficiency increases the efficiency of the evaporator.

Description

technical field [0001] The invention relates to the technical field of evaporators, in particular to a central circulation tube evaporator. Background technique [0002] The main body of the central circulation tube evaporator is generally composed of an evaporation chamber and a heating chamber. The heating chamber is usually a shell-and-tube heat exchanger, which consists of two upper and lower tube sheets and a vertical heating tube bundle. A thick central tube is installed in the center of the tube bundle. The working principle of the circulation tube is: the heating area per unit volume of the solution in the heating tube bundle is larger than the heating area in the circulation tube, so that the heating effect of the solution in the heating tube bundle is good, and the solution vaporizes more, so the solution in the heating tube bundle has a high gas content, so that Its density is lower than that of the solution in the central circulation pipe. This density difference...

AI Technical Summary

Problems solved by technology

[0003] 1. The heating tube bundle of the existing central circulating tube evaporator is composed of many cylindrical heating tubes, but due to the limitation of the shape of the heating tubes and the certain distance between adjacent heating tubes, the adjacent heating tubes The heat of the heating steam in the central part of the gap between the heating tubes cannot be fully utilized, and because the volume of the solution contained in a single heating tube bundle is too small, the heat exchange rate is greatly reduced after absorbing the heat of the steam around the heating tubes, The heat in the center needs to be recycled repeatedly before it can be used. In addition, the speed of heat transfer to the solution through the heating tube is lower than the direct heat transfer rate between the solutions. Too many circular heating tubes will reduce the heat exchange efficiency of the evaporator. Extended evaporation time

[0004] 2. The heating tube bundle of the existing central circulation tube evaporator is composed of many circular heating tubes with smaller diameters, but because the diameter is too small, the dirt generated after the solution is heated and flowing for a long time will adhere to it. Inside, it is particularly inconvenient to clean, which makes the later cleaning process more difficult

[0005] 3. The heating steam inlet of the existing central circulation tube evaporator is located in the upper part of the heating chamber, but because the hot steam has a climbing effect, setting the inlet in the upper part will make most of the hot steam gather in the upper part of the heating chamber, while the bottom is cooled The low-temperature steam that sinks later causes the entire heating chamber to heat the solution at a short distance from the top in most cases. A large amount of steam is generated through extremely fast short-distance heating, which increases the number of cycles of solution heating and reduces the efficiency of evaporation

Images