Double distillation type multiple-effect distilled water machine

Abstract

The invention is a double-distillation type multiple effect distilled water machine, belonging to water distillation device. Its features lie in: the evaporator is divided into two segments, the upper one is steam-water separation segment, the lower is evaporating segment, the steam inlet arranged on the evaporating segment of the first effect evaporator is connected to industrial boiler steam source, the water condensing port is connected to preheater, the condensing ports of the following effect evaporator are connected to the condenser, there arranges a material condensed water discharging port on the last effect evaporator, the water pipe is connected to the water inlet of the first evaporator through condenser pipe and preheater. The invention can use the residue heat generated by the device, upgrades the use factor of heat and the reclaiming rate of distilled water, and the structure is compact.

Description

technical field [0001] The invention belongs to the field of water distillation equipment, in particular to a double distillation multi-effect water distiller. Background technique [0002] At present, the equipment for producing medical distilled water generally adopts an external spiral or internal spiral multi-effect distilled water machine. The distilled water machine is connected in series by multi-effect evaporators. Each effect evaporator in the prior art needs to be equipped with a separate raw material water preheater. It is a steam-water separation structure, and the condenser connected to the evaporator needs to be independently equipped with a cooling water delivery and circulation system. The distilled water machine with a similar structure has the following shortcomings: [0003] 1. When the evaporator adopts the upper part of the water distribution, the raw material water is easy to form part of the falling film flowing down the tubes, part of the water colum...

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Problems solved by technology

[0003] 1. When the evaporator adopts the upper part of the water distribution, the raw material water is easy to form part of the falling film flowing down the tubes, part of the water column flows down in the tubes, and part of the tubes are short of water, resulting in uneven distribution of raw material water among the tubes. And due to the unstable steam pressure of the boiler, the output of the secondary steam is also unstable. Under the fluctuation of the secondary steam back pressure, the raw material water flows down in each row of tubes intermittently. In addition, it is affected by the evaporation Due to the limitation of the length of each tube of the device, the raw water cannot be fully evaporated within a unit time, and the high-temperature steam of the first effect is always working in the evaporation section, the utilization rate of heat energy is greatly reduced, and the steam energy produced by the upper effect is low. The heat energy received by the subsequent effect evaporators is reduced, and the evaporation energy of the subsequent effect evaporators is also reduced accordingly, which directly leads to energy waste and a greatly reduced distilled water yield

[0004] 2. In prior art equipment, each evaporator needs to be equipped with a separate preheater in series. The heat source for the preheater to heat the raw material water is the steam supplied by the evaporator, which will cause the steam in the evaporator to split, and the evaporator The steam energy decreases and the evaporation energy decreases, which eventually leads to excessive steam consumption and increased energy consumption

[0005] 3. The raw material water at the bottom of each evaporator enters the top of the lower-effect evaporator through the delivery pipeline after the first effect of the existing technology equipment, and the raw material water connection pipeline of each effect evaporator and the secondary steam of each evaporator enter the lower-effect evaporator The exposed part of the connecting pipeline is long and is easily affected by the external environment temperature. The equipment will inevitably release and lose a certain amount of heat energy, resulting in waste of energy. produce adverse factors

The condensers of the prior art equipment must be equipped with a separate cooling water circulation system to cool down the clean distilled condensed water and steam produced by each effect evaporator, so as to speed up the condensation of distilled water, which requires an additional configuration The equipment matched with the pump set not only increases the production and manufacturing costs of the equipment, but also wastes the waste heat generated by the evaporator and a huge cooling water source, which directly leads to complex structure of the equipment and increased energy consumption. This ultimately leads to an increase in the cost of distilled water production

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