Heat pump-double-effect membrane distillation apparatus and distillation method

A technology of membrane distillation and heat pump evaporator, which is applied in the field of heat energy recovery and utilization, can solve the problems of large condensation on the cold side and high energy consumption, and achieve the effects of high heat recovery efficiency, simple equipment, and high water production ratio

Active Publication Date: 2016-06-29
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current membrane distillation has limited the further development of membrane distillation technology due to the large energy consumption and large condensation on the cold side. The heat pump technology can not only recover the waste heat from the cold side of the membrane distillation system, but also effectively solve the problem of the cold side of the membrane distillation system. The problem of high condensation

Method used

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  • Heat pump-double-effect membrane distillation apparatus and distillation method

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Effect test

Embodiment 1

[0031] Material liquid: seawater (index) (main component: Ca 2+ 410mg / L; Mg 2+ 1310mg / L; Na + 10900mg / L; K + 390mg / L; Ba 2+ 0.05mg / L; Cl - 19700mg / L; SO 4 2- 2740mg / L; HCO 3 - 152mg / L)

[0032] Pretreatment: 5 micron and 1 micron pp cotton to remove liquid and solid impurities

[0033] The first-effect membrane distillation membrane module is a polypropylene flat membrane module, and the inlet temperature of the hot side: 75°C

[0034] The second-effect membrane distillation membrane module is a polyvinylidene fluoride coiled membrane module, and the inlet temperature of the hot side is 65°C

[0035] Average temperature difference of heat exchanger: 5.3°C

[0036] Compressor: reciprocating piston compressor

[0037] Results: The product is distilled water, the heat recovery rate is over 90%, and the water-to-water ratio is 8.6.

Embodiment 2

[0039] Material liquid: Concentrated water from steel plant reverse osmosis (main component: Ca 2+ 320mg / L; Mg 2+ 310mg / L; Na + 46900mg / L; K + 39mg / L; Cl - 59800mg / L; NO 3 2- 2740mg / L; HCO 3 - 552mg / L)

[0040] Pretreatment: 5 micron and 1 micron pp cotton to remove liquid and solid impurities

[0041] The first effect membrane distillation membrane module is a polytetrafluoroethylene flat membrane module, the inlet temperature of the hot side: 80 ℃

[0042] The second-effect membrane distillation membrane module is a polyvinylidene fluoride hollow fiber membrane module, and the inlet temperature of the hot side: 70°C

[0043] Average temperature difference of heat exchanger: 6.1℃

[0044] Compressor: screw compressor

[0045] Results: The product is distilled water, the heat recovery rate is over 90%, and the water-to-water ratio is 6.3.

Embodiment 3

[0047] Material liquid: simulated seawater (main component: Ca 2+ 410mg / L; Mg 2+ 1310mg / L; Na + 10900mg / L; K + 390mg / L; Cl - 19700mg / L; SO 4 2- 2740mg / L)

[0048] Pretreatment: 5 micron and 1 micron pp cotton to remove liquid and solid impurities

[0049] The first-effect membrane distillation membrane module is a polypropylene hollow fiber membrane module, and the inlet temperature of the hot side: 80°C

[0050] The second-effect membrane distillation membrane module is a polytetrafluoroethylene hollow fiber membrane module, and the inlet temperature of the hot side: 70°C

[0051] Average temperature difference of heat exchanger: 8.7℃

[0052] Compressor: Rolling piston compressor

[0053] Results: The product is distilled water, the heat recovery rate is over 90%, and the water-to-water ratio is 6.5.

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Abstract

The invention provides a heat pump-double-effect membrane distillation apparatus and distillation method, belonging to the technical field of membrane distillation. The apparatus comprises a hydrophobic membrane module specially used for membrane distillation, heat preservation cotton arranged out of the membrane module, a water pump used for providing power for circulation of a membrane distillation system, a heat exchanger used for heat exchange between liquid located a cold side of a first-effect membrane module and at a hot side of a second-effect membrane module, an evaporator used for absorbing waste heat of liquid located at a cold side of the second-effect membrane module, a condenser used for heating liquid located a hot side of the first-effect membrane module, a compressor used for converting absorbed low-level heat into high-level heat and a throttle valve exerting throttling and pressure-reducing effect on a circulating working medium and used for adjusting the flow of the circulating working medium entering the evaporator. The whole multiple-effect heat pump-membrane distillation system has the advantages of high heat recovery efficiency, simple equipment, a high integrated level, conservation of energy, convenience in operation, etc.

Description

technical field [0001] The invention relates to the field of heat energy recovery of a heat pump, in particular to the heat energy recovery and utilization of a membrane distillation system, and belongs to the technical field of membrane distillation. Background technique [0002] A heat pump is an energy device that transfers heat from a low-temperature object to a high-temperature object by consuming part of the energy as a compensation condition. Heat pumps can convert the heat energy contained in gases and liquids that cannot be directly used and industrial waste energy into heat energy that can be used. Common heat pumps include compression heat pumps and absorption heat pumps. [0003] A compression heat pump is generally composed of a compressor, a condenser, a throttle valve (expansion valve) and an evaporator. The heat pump working fluid is continuously circulated in the system as a heat transfer medium, and the compressor plays the role of compressing and transmitt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D61/36C02F1/08C02F1/44C02F103/08
CPCY02B30/52
Inventor 彭跃莲于超
Owner BEIJING UNIV OF TECH
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