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Multi-stage membrane distillation system with energy recycling

A technology of energy recovery and membrane distillation, which is applied in the direction of heating water/sewage treatment, special treatment targets, water/sludge/sewage treatment, etc. It can solve the problems of low-grade heat sources that cannot be effectively used, low pressure, and low energy consumption. , to achieve the effect of low pressure, low cost and low energy consumption

Pending Publication Date: 2019-10-22
LANZHOU UNIVERSITY OF TECHNOLOGY
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  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a multi-stage membrane distillation system with energy recovery in order to solve the problem that low-grade heat sources in the prior art cannot be effectively utilized. The membrane module of this multi-stage system is a new type with The membrane module with condensing structure has the function of improving the permeation flux in the design of the membrane module. Compared with reverse osmosis and other systems, the biggest feature of this multi-stage system is that after thermal membrane coupling, this system consumes less energy. , Low pressure can make full use of low-grade heat sources, and realize the recovery of steam phase change heat and the recycling of waste heat of hot material liquid

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Embodiment example 1

[0029] Implementation case 1: A multi-stage membrane distillation system with energy recovery, including at least one membrane distillation module, the membrane distillation module includes a hot material chamber 1 and a cold material chamber 2, and a hot material chamber 1 and a cold material chamber There is a membrane body between the chambers 2, and a cold wall is arranged in the gap at the lower end of the membrane body, and an air gap chamber 3 is formed between the membrane body and the cold wall, and a number of condensing parts 4 are arranged at intervals in the air gap chamber 3, and the heating material chamber 1 The two ends are respectively provided with a hot material water inlet and a hot material water outlet, the two ends of the cold material chamber 2 are respectively provided with a cold material water inlet and a cold material outlet, and the air gap is provided with a condensed water outlet;

[0030]The upper end of the hot material chamber 1 is connected w...

Embodiment example 2

[0035] Implementation Case 2: As shown in the figure, this implementation is further optimized on the basis of Embodiment 1. This embodiment focuses on the improvements compared with Embodiment 1, and the similarities will not be repeated. The concentrated water tank 19 is connected There is a return assembly, which includes a return pipe 22 connecting the concentrated water tank 19 and the waste water tank 5. The return pipe 22 is sequentially provided with a third regulating valve 21 and a concentrated water pump 20. The concentrated water tank 19 is connected with a return assembly. The waste water exchanged by the exchanger 10 flows into the concentrated water tank 19 after cooling down, and the waste water in the concentrated water tank 19 can be pumped back to the waste water tank 5 by the concentrated water pump 20 for recycling, realizing the recycling of waste water.

Embodiment example 3

[0036] Implementation Case 3: As shown in the figure, this implementation is further optimized on the basis of Example 1. This example focuses on the improvements compared with Example 1, and the similarities will not be repeated. The condensate outlet It is connected with a water production pipe 24, and a pressure pump 25 is arranged on the water production pipe 24. The water production pipe 24 is connected with the water production tank 23. The condensed water outlet of each membrane distillation module is connected with a water production pipe 24, and the water production pipe 24 is provided with a The pressure pump 25 and the water production pipe 24 communicate with the water production tank 23. The condensed water filtered by the membrane body is collected into the water production tank 23 through the condensed water outlet in the air gap chamber 3. The pressure pump 25 can be used to transfer one or Multiple membrane distillation components combine the membrane distillat...

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Abstract

The invention discloses a multi-stage membrane distillation system with energy recycling. The system comprises one or more membrane distillation components, wherein the membrane distillation components comprise hot material chambers and cold material chambers; membranes are arranged between the hot material chambers and the cold material chambers; cold walls are arranged at intervals at lower endsof the membranes; air gap chambers are formed between the membranes and the cold walls; a plurality of condensation parts are arranged at intervals in the air gap chambers; a hot material water inlethole and a hot material water outlet hole are respectively formed in both ends of each hot material chamber; a cold material water inlet hole and a cold material water outlet hole are respectively formed in both ends of each cold material chamber; condensed water outlet holes are formed in air gaps; upper ends of the hot material chambers are communicated with a hot material component; lower endsof the cold material chambers are communicated with a cold material component. By adopting the system, heat of a low-grade heat source can be recycled; compared with systems such as reverse osmosis,the system has the main characteristics that after hot membrane coupling, the system has low energy consumption and small pressure, the low-grade heat source can be sufficiently utilized, and recycling of phase-change heat of vapor and circulation of waste heat of a hot material liquid can be achieved.

Description

technical field [0001] The invention belongs to the technical field of waste water treatment, and in particular relates to a multistage membrane distillation system with energy recovery and utilization. Background technique [0002] With the development of the world economy and the increase of energy consumption, energy and environmental issues have become a hot issue of common concern all over the world, and low-grade thermal energy, as energy that can be seen everywhere in life, the heat in the air and the heat in seawater It is a pity that the low-grade waste heat generated in the production process of enterprises, or even the heat emitted by automobile exhaust, is difficult to be utilized. For example, general chemical enterprises will produce a lot of low-grade heat energy, especially the low-grade heat energy produced by coal chemical industry. Most of the heat energy in these places is low-pressure steam and hot water above 100 degrees Celsius. Thermal energy is more...

Claims

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Application Information

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IPC IPC(8): C02F1/08
CPCC02F1/08C02F2303/10
Inventor 吴江波马韬杜小泽刘姝君
Owner LANZHOU UNIVERSITY OF TECHNOLOGY
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