Distributed dosing device and method for seawater desalination device

Abstract

The invention discloses a distributed dosing device of a seawater desalination device; the dosing device includes a dosing mechanism which is connected with an inlet of the falling film condenser andan inlet spraying water pipeline of each effect group through a dosing pipeline; the dosing mechanism comprises at least a triple-header structure; the at least triple-header structure comprises a scale inhibitor storage box, a standby storage box and a defoaming agent storage box which are sequentially connected through a box communication door, wherein each storage box is provided with a stirring mechanism and a medicine adding pump set; the medicine adding pump set is connected with each storage box through a medicine box outlet door, one path of the medicine adding pump set of the standbystorage box is connected with a scale inhibitor pipeline, and the other path is connected with a defoaming agent pipeline. The invention aims to provide the distributed dosing device for the sea waterdesalination device, the modular design is adopted, the space occupancy rate is reduced, the number of headers can be increased or decreased according to the on-site dosing requirement, the disassembly and movement are convenient, the on-site adaptability is high, the corresponding manufacturing cost is reduced, and the technical problems of the dosing device in the prior art are solved.

Description

technical field [0001] The invention relates to the technical field of seawater desalination, in particular to a distributed dosing device and method for a seawater desalination device. Background technique [0002] The low-temperature multi-effect seawater desalination device is a thermal seawater desalination process with many commercial cases at present. It is characterized in that a series of evaporators (referred to as effects) containing spray tube bundles are connected in series, and a certain amount of steam is input into the inside of the heat exchange tube. , a certain amount of pretreated seawater is sprayed on the upper part of the tube. After heat exchange, the seawater becomes secondary steam and enters the next effect. The steam in the tube is collected after being condensed by seawater heat exchange. After repeated evaporation and condensation in the device, The process of obtaining desalinated water that is many times the amount of steam. [0003] In the lo...

AI Technical Summary

Problems solved by technology

There are certain shortcomings in the above-mentioned dosing method, and the shortcomings are as follows: (1) Generally, single-point dosing is adopted, the dosing amount is uneven, the mixing effect is poor, and the consumption along the way is large, and the effect of the medicine cannot be well exerted

Due to the above reasons, the long-term operation of the system will easily cause salt accumulation, scaling and corrosion on the surface of the heat exchange tubes to varying degrees, which will affect the heat exchange, effluent water quality and safe and stable operation of the device; (2) Each dosing system is arranged separately, occupying The space is large, and the operation is inconvenient; (3) The working conditions of pre-treatment and post-treatment are not fully considered, and only two kinds of drugs, scale inhibitor and defoamer, are added to the original seawater

Affected by seawater quality changes, water quality requirements and other related requirements, the future low-temperature multi-effect seawater desalination system may increase pre-processes such as raw water dosing and product water conditioning; (4) If the seawater desalination device operates continuously, it will not be possible to The timely cleaning of the medicine tank cannot avoid the impact of the sediment and impurities at the bottom of the tank on the water quality after the medicine is added; (5) In the initial stage of medicine preparation, some medicines need to be diluted with water, or some medicines need to be matured for a certain period of time (6) Due to the uneven initial mixing of the drug storage tank and the stratification phenomenon during the storage process in the tank, the concentration of the drug changes greatly during the dosing process, which affects the safety of the system. Stable operation; (7) The existing dosing system has a low degree of automation. Usually, dosing is calibrated before dosing, and the real-time dosing amount cannot be displayed accurately in real time. It is difficult to judge and count the consumption of medicines

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