A graphite evaporator for evaporation and concentration and its automatic control system

Abstract

The invention provides a graphite evaporator for concentration by evaporation. The graphite evaporator comprises a housing, a waveform heat insulating layer is spread on an inner wall of the housing, a corrosion preventing composite layer is spread on an outer wall of the housing, and the housing is made from stainless steel; the upper part, the middle part and the lower part of the housing are separately provided with a loop of steam distributor, sides of each of the steam distributors at the upper part and the lower part of the housing are provided with steam inlets, a steam inlet passage is arranged at one side of the steam distributor in the middle part of the housing, automatic control systems are connected to the steam inlets, and a steam outlet is arranged above one side of the steam inlet at the upper part of the housing; several U-shaped grooves and lateral through holes are arranged at the outside of graphite heat exchange blocks, and places between every two layers of the graphite heat exchange blocks are sealed with fluororubber. The graphite evaporator has the advantages of improved steam utilization rate, enhanced corrosion resistance, high temperature resistance and high pressure resistance, prolonged service life, and excellent performance; and automatic control is realized at the same time. The invention also comprises an automatic control system for controlling the graphite heat exchanger for concentration by evaporation.

Description

technical field [0001] The invention relates to a graphite evaporator, in particular to a graphite evaporator for evaporative concentration and an automatic control system thereof. Background technique [0002] Graphite evaporators are widely used in pharmaceutical, chemical and other industries. Because graphite has the characteristics of high temperature resistance, corrosion resistance, high pressure resistance, and good thermal conductivity, it is often used to evaporate and concentrate acid-base waste liquid or feed liquid. In the traditional graphite evaporator, there is only one steam inlet, and a large amount of high-temperature steam will rise up when entering the evaporator, resulting in uneven distribution of steam in the upper and lower parts of the evaporator, which will lead to uneven heat distribution and heat transfer. The efficiency is reduced, and in the case of a sudden increase in the steam pressure, if the steam pressure is not controlled, the evaporator...

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Problems solved by technology

In the traditional graphite evaporator, there is only one steam inlet, and a large amount of high-temperature steam will rise up when entering the evaporator, resulting in uneven distribution of steam in the upper and lower parts of the evaporator, which will lead to uneven heat distribution and heat transfer. The efficiency is reduced, and in the case of a sudden increase in the steam pressure, if the steam pressure is not controlled, the evaporator will be damaged due to the sudden increase in the steam pressure; in addition, the steam entering the traditional evaporator is injected If the steam passes through the heat exchange holes of the graphite heat exchange block, the utilization rate of the steam is reduced and it is easy to cause the graphite heat exchange block to burst; in the existing graphite evaporator, the graphite evaporator is often in a humid working environment, and the outer wall of the shell is easy to Leakage caused by rust, the condensed liquid in the evaporator cannot be discharged in time and is vaporized repeatedly, which reduces the utilization rate of steam, and also causes excessive humidity in the evaporator to cause damage to the graphite heat exchange block and other parts; in addition, the existing The graphite evaporator has a low degree of automation, a large amount of manual operation, a small safety factor, and a correspondingly high cost

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