Constant-pressure multiple-effect evaporation condensation sea water desalination device with air medium

Abstract

The invention discloses a constant-pressure multiple-effect evaporation condensation sea water desalination device with an air medium, which mainly comprises a low-and-medium temperature heat source (13), a first-stage heating evaporator (14), an evaporation condenser (4) and a last-stage condenser (8). The first-stage heating evaporator (14), the evaporation condenser (4) and the last-stage condenser (8) are installed in sequence closely, and the low-and-medium heat source (13) and the first-stage heating evaporator (14) are connected together. The first-stage heating evaporator (14), the evaporation condenser (4) and the last-stage condenser are all formed by combining a plurality of heat exchange plates which are arranged from left to right in sequence, and a gap is reserved between every two adjacent heat exchanging plates to form a flow channel for heat exchange fluid. By adopting the plate-type heat exchange principle, the sea water desalination device realizes multiple-effect air humidification and dehumidification evaporation and condensation for sea water desalination under constant pressure. Heat and moisture transfer is performed between sprayed sea water and overflowing air, and the condensation latent heat of fore effect heat and moisture air can be absorbed at the same time, and therefore, energy recovery is realized and the fore effect heat and moisture air can be condensed to obtain fresh water.

Description

Technical field: [0001] The invention relates to a seawater desalination device, in particular to a multi-effect humidification and dehumidification evaporation condensation seawater desalination device. Background technique: [0002] At present, the thermal seawater desalination technologies used in industrial applications are mainly low-temperature multi-effect distillation and multi-stage flash seawater desalination technologies. Since seawater needs to be evaporated and condensed at a lower temperature to obtain fresh water, these technologies need to be operated under low temperature and low pressure conditions. The maintenance of vacuum degree and forced discharge of fresh water and concentrated brine in the system operation require a large power consumption. At the same time, since the system needs to operate under negative pressure conditions, the system has high requirements for equipment sealing, increased processing and maintenance costs, difficult troubleshooting...

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Problems solved by technology

[0003] The purpose of the present invention is to overcome the large power consumption caused by vacuum maintenance, non-condensable gas and concentrated seawater discharge necessary for low-temperature multi-effect evaporation and flash evaporation system negative pressure operation in the prior art, and its system insulation and operation Difficult maintenance, poor capacity adaptability, etc., as well as the disadvantages of difficult energy recovery and low system performance of existing humidification and dehumidification seawater desalination technology, provide an atmospheric pressure multi-effect evaporation condensation seawater desalination device with air as the medium

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