Rising film and falling film multi-effect distilled water machine

Abstract

The invention relates to a rising film and falling film multi-effect distilled water machine, and belongs to the field of pharmacy equipment. The machine comprises a condenser, a pre-heater, and evaporators sequentially connected according to a process. The machine is characterized in that raw material water inlets of a first-effect or first-effect and second-effect evaporators are arranged on a lower end. According to the invention, an evaporation manner is realized that a rising film and falling film evaporation technical structure is adopted; raw material water is delivered through the bottom of the first-effect evaporator or the first-effect and second-effect evaporators; and uniform distribution is realized in a water inlet pipe. According to prior arts, raw material water enters from the top of the first-effect evaporator, and gravity flow rate forms when the raw material water flows from top to bottom in an evaporation pipe; under the promotion of delivering pump pressure, flow rate of the raw material water in the pipe is even higher, such that the heat displacement time for water in the pipe and steam in the shell is greatly reduced, and heat exchange efficiency is low. With the machine provided by the invention, the defect is overcome.

Description

technical field [0001] The invention relates to a rising-film and falling-film multi-effect distilled water machine, which belongs to the field of pharmaceutical equipment. Background technique [0002] At present, most pharmaceutical manufacturers need to use multi-effect distilled water machines, and the technology of multi-effect distilled water machines is relatively mature. Due to the difference in technology, there are multiple structural forms of multi-effect distilled water machines in the domestic and foreign markets. These different types of products all have similar processes. Both are composed of multiple evaporators, multiple preheaters, condensers and pipelines. The water production process is as follows: the total raw water is transported into the condenser through the pipeline, and the output of the condenser enters each effect preheater in turn, and the raw water finally enters the tube side from the top of the first effect evaporator and is distributed in ...

AI Technical Summary

Problems solved by technology

The disadvantage of this process is: the bacteria separated by the first effect evaporation enter the lower effect evaporator with the raw material water. Originally, the more the raw material water evaporates, the higher the concentration of the bacteria will be. The hidden danger of body separation (the more thorough the separation of soda and water, the higher the quality of distilled water obtained), and the final output of water for injection is of poor quality (high bacterial endotoxin content index)

[0004] 2. In the multi-effect distilled water machine with traditional technology, all the raw water enters the tube side from the top of the one-effect evaporator, which results in a large flow of water in the tube side, and the one-effect evaporator cannot dissipate all the raw material water. All evaporated water can only evaporate about one-third of the total raw material water, and most of the unevaporated raw material water in the tube side consumes the steam heat energy in the shell side in vain

Due to the different equipment specifications, the heat exchange area is different, and the number and cross-sectional area of ​​the evaporator tubes are also relatively different. It is difficult to achieve a balanced water distribution of all the tubes with the top water inlet method, which will inevitably cause water flow in the tubes. More or less, even some of the tubes are in an anhydrous state; the raw material water is affected by the steam reaction force at the lower end of the evaporator cavity during the downward process in the tube side, and it is easy to cause paroxysmal water flow

As a result, the raw material water flow rate is too fast or the flow rate is unstable, the heat exchange area of ​​the evaporator cannot be fully utilized, the energy utilization is insufficient, and the evaporation performance of the whole machine is poor and the efficiency is low.

[0006] 4. Since all raw water enters from the top of the first-effect evaporator, the flow of raw water in the evaporation tube from top to bottom will inevitably form a gravity flow rate, and the raw water will flow through the tube under the pressure of the delivery pump. The water flow speed in the tube is faster, which greatly shortens the heat exchange time between the water in the tube side and the steam in the shell side, resulting in the disadvantage of low heat exchange efficiency

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