Double-inlet and double-outlet plate heat exchanger and seawater desalting device

Abstract

The invention discloses a double-inlet and double-outlet plate heat exchanger and a seawater desalting device. The double-inlet and double-outlet plate heat exchanger comprises a front end plate, a heat dissipating net, a brazing flux layer, a back end plate, a first heat exchange plate, a flow control valve, a temperature sensor and a third water inlet; the front end plate is provided with a first water inlet; the flow control valve is arranged in the first water inlet; a second water inlet is formed beside the first water inlet; the third water inlet is formed beside the second water inlet;and fastening bolts are arranged on two sides of the third water inlet. The double-inlet and double-outlet plate heat exchanger has the following beneficial effects: the original heat exchange effectcan be improved; the seawater flow is increased; the seawater flowing speed is lowered; the pipe scouring is reduced; the equipment service life is prolonged; seawater can be fed from double sides ofthe front and back ends, so that the joint flowing speed of the plate heat exchanger of a seawater system is reduced, and the heat exchange effect is improved; as one more joint is provided, the totalseawater flow is increased under the same pressure; and through double-inlet and double-outlet, the pipe circulating capacity is improved, the joint flowing speed is reduced, and the wear is reduced.

Description

technical field [0001] The invention relates to the field of petrochemical seawater pipelines, in particular to a double-inlet and double-outlet plate heat exchanger and a seawater desalination device. Background technique [0002] In general, the main equipment in the circulating water field includes circulating water pumps, plate heat exchangers, seawater filters, etc.; the function of the plate heat exchanger is to cool the circulating water and seawater and exchange heat, and the return water of the device passes through the plate heat exchanger. The seawater system in the heater is cooled down, and the pressure is re-boosted by the circulating water pump to supply each device to continue to circulate. Due to the influence of system design and heat exchange effect, the temperature of the circulating water outlet of the plate heat exchanger cannot always meet the requirements, and the cleaning and dosing of the heat exchanger cannot achieve good results. At present, in t...

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Problems solved by technology

However, there are still many problems in the scheme of Document 1: First, the heat exchanger in Document 1 only uses corrugated plates to achieve heat exchange without other heat dissipation and heat absorption mechanisms, so the heat exchange effect is not ideal; second, the heat exchanger in Document 1 Setting up two input and output ports increases the flow of water but does not set up a pressure-relief device, which may cause loss to the equipment, etc.

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