Medical injection water preparation system and control method thereof

Abstract

The invention provides a medical injection water preparation system and a control method thereof. The medical injection water preparation system comprises a preparation unit and a control unit, wherein the preparation unit is used for preparing medical injection water; the control unit is arranged in the preparation unit and used for controlling and adjusting the preparation unit in the working process, so that in the medical injection water preparation system, the pressure of a steam generator is kept at 0.4-0.8 MPa, and the liquid level is kept at 5-35 cm; steam ejected from a steam outlet of a steam ejector is maintained to be saturated steam with a temperature of 112-125 DEG C; the temperature drop between two adjacent falling film evaporators is kept at 3-5 DEG C; and the water production ratio of qualified product water of the medical injection water preparation system is not less than 8. The system has the beneficial effects that the overheating phenomenon existing after pure water steam and supplementary steam are mixed is overcome, and the problem that the heat efficiency of the first-effect evaporator is insufficient due to elimination of the steam superheat degree is solved; and possible pipe emptying, pipe submerging and other bad working conditions in the system are eliminated, and high operation stability and ideal water production efficiency of the injection water preparation system are guaranteed.

Description

technical field [0001] The invention relates to the field of water for injection, in particular to a medical water for injection preparation system and a control method thereof. Background technique [0002] Medical water for injection refers to the water that complies with the provisions of Chinese Pharmacopoeia Water for Injection. Water for injection is distilled or deionized water, so it is also called distilled water. Ordinary normal water contains a large amount of suspended solids, salts, organic matter, bacteria and other impurities, which cannot be directly used to make water for injection. It must go through a certain purification process, first obtain purified water, and then remove it again through distillation. Impurities, and finally make water for injection. The method for preparing water for injection, Chinese Pharmacopoeia clearly stipulates that the distillation method must be used to prepare medical water for injection. [0003] In the distillation proc...

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Problems solved by technology

However, its disadvantage is that the heat source steam provided by the jet compressor to the first-effect horizontal tube falling-film evaporator has overheating phenomenon, and the superheat degree cannot be stably controlled, resulting in insufficient thermal efficiency of the first-effect evaporator, which cannot produce enough energy to effectively drive the evaporator. The steam in the second effect evaporator greatly reduces the operation stability of the entire system; at the same time, during the long-term operation of the system, there are prone to unfavorable working conditions such as empty pipes and flooded pipes inside the equipment, and it is impossible to ensure that each effect evaporator maintains a good Heat exchange efficiency, long-term operation of the system will cause a significant drop in water production efficiency

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