Marine thermal deoxidization waste heat utilization coupling seawater desalination combined plate heat exchange system

Abstract

The invention relates to a marine thermal deoxidization waste heat utilization coupled seawater desalination combined plate heat exchange system, which is characterized in that seawater flows into a seawater inlet end of a seawater heat exchanger, a seawater outlet end is connected with a reverse osmosis seawater desalination device, and the reverse osmosis seawater desalination device is connected with a soft water heat exchanger and is used for seawater softening treatment; the soft water heat exchanger is respectively connected with the soft water heat exchanger and the seawater heat exchanger after passing through a three-way temperature control valve through a deaerator, and is used for adjusting the temperature of the deoxygenated water entering the soft water heat exchanger and the seawater heat exchanger through the three-way temperature control valve; deoxygenated water outlet ends of the soft water heat exchanger and the seawater heat exchanger are respectively connected with a boiler. According to the system, waste heat of high-temperature deoxygenated water is utilized, redundant energy consumption is avoided, and the heat utilization rate of the whole system is increased. The water quantity of high-temperature deaerators entering the seawater heat exchanger and the soft water heat exchanger is adjusted according to the temperature of the seawater so as to keep the temperature of the seawater entering the reverse osmosis equipment stable.

Description

Technical Field

[0001] The invention relates to a reverse osmosis seawater desalination device, in particular to a combined plate heat exchange system for marine thermal deoxidation waste heat utilization coupled with seawater desalination. Background Art

[0002] At present, reverse osmosis desalination equipment, deaerators and plate heat exchangers are important equipment in the field of ships. The production process of deoxygenated water on ships is as follows: seawater is treated into fresh water by reverse osmosis desalination equipment, and the fresh water after water quality treatment is heated by deaerator to remove dissolved gases in the water to become deoxygenated water, which is finally used as marine boiler feed water.

[0003] In view of the particularity of marine use. When facing the marine environment with low seawater temperature in winter, in order to meet the minimum seawater inlet temperature requirement of the reverse osmosis seawater desalination equipment, a device is needed to add preheating seawater before the reverse osmosis seawater desalination equipment. Summary of the invention

[0004] According to the characteristics of the entire preparation process of marine boiler feed water, the present invention proposes a marine thermal deoxidation waste heat utilization coupled with seawater desalination combined plate heat exchange system, which is used to heat seawater using the waste heat of the deaerator when the seawater temperature is low in winter when the ship is sailing, so as to meet the minimum seawater inlet temperature requirement of the reverse osmosis seawater desalination equipment.

[0005] To achieve the above-mentioned purpose, the technical scheme of the present invention is: a combined plate heat exchange system for thermal deoxidation waste heat utilization coupled with seawater desalination for marine use, comprising a reverse osmosis seawater desalination device, a deaerator, a seawater heat exchanger, a soft water heat exchanger, and a three-way temperature control valve. The seawater inlet end of the seawater heat exchanger is connected to seawater, and the seawater outlet end is connected to the reverse osmosis seawater desalination device, which is used for seawater to enter the seawater heat exchanger and heat exchange with high-temperature deoxygenated water before entering the reverse osmosis seawater desalination device. The reverse osmosis seawater desalination device is connected to the soft water heat exchanger for seawater softening treatment, and softened water is sent to the soft water heat exchanger for heat exchange with high-temperature deoxygenated water. The soft water heat exchanger is connected to the soft water heat exchanger and the seawater heat exchanger respectively after passing through the deaerator and the three-way temperature control valve, which is used to adjust the temperature of the deoxygenated water entering the soft water heat exchanger and the seawater heat exchanger through the three-way temperature control valve. The deoxygenated water outlets of the soft water heat exchanger and the seawater heat exchanger are respectively connected to boilers.

[0006] Furthermore, in the combined plate heat exchange system, seawater first enters the seawater heat exchanger to exchange heat with high-temperature deoxygenated water and then enters the reverse osmosis desalination device. After multiple treatments, it becomes softened water. The softened water enters the soft water heat exchanger to exchange heat with high-temperature deoxygenated water and then enters the deaerator to be processed into high-temperature deoxygenated water. After that, the three-way temperature control valve adjusts the amount of high-temperature water entering the seawater heat exchanger or the soft water heat exchanger according to the seawater inlet temperature, so as to keep the temperature of the seawater entering the reverse osmosis desalination device within a normal range.

[0007] Furthermore, the combined plate heat exchange system is used in a marine deoxygenated water treatment system, which utilizes the waste heat of the high-temperature deoxygenated water to heat the low-temperature seawater, and has the adjustability to maintain the temperature of the heated seawater stable.

[0008] Beneficial effects of the present invention:

[0009] 1. The system utilizes the waste heat of high-temperature deoxygenated water itself, without any extra energy consumption, thus improving the thermal utilization rate of the overall system.

[0010] 2. The system adjusts the amount of high-temperature deaerator water entering the seawater heat exchanger and the soft water heat exchanger according to the temperature of the seawater to keep the temperature of the seawater entering the reverse osmosis equipment stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a schematic diagram of the combined plate heat exchange system of the present invention that utilizes waste heat from thermal deoxidation and is coupled with seawater desalination. DETAILED DESCRIPTION

[0012] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0013] like Figure 1 As shown, an embodiment of the present invention provides a combined plate heat exchange system for marine thermal deoxidation waste heat utilization coupled with seawater desalination, including a reverse osmosis seawater desalination device 1, a deaerator 2, a seawater heat exchanger 3, a soft water heat exchanger 4, a three-way temperature control valve 5, and a boiler 6.

[0014] The water inlet of the seawater heat exchanger 3 is connected to seawater and is connected to the soft water heat exchanger 4 through the reverse osmosis seawater desalination device 1. The soft water heat exchanger 4 is connected to the boiler 6 through the deaerator 2 and the three-way temperature control valve 5 through the soft water heat exchanger 4 and the seawater heat exchanger 3 respectively.

[0015] In the system, seawater first enters the seawater heat exchanger 3 to exchange heat with high-temperature deoxygenated water and then enters the reverse osmosis desalination device 1. After multiple treatments in the reverse osmosis desalination device 1, it becomes softened water. The softened water enters the soft water heat exchanger 4 to exchange heat with high-temperature deoxygenated water and then enters the deaerator 2 to be processed into high-temperature deoxygenated water. After that, the three-way temperature control valve 5 adjusts the amount of high-temperature water entering the seawater heat exchanger 3 or the soft water heat exchanger 4 according to the seawater inlet temperature, so as to keep the temperature of the seawater entering the reverse osmosis desalination device within a normal range. Finally, the deoxygenated water that meets the requirements is supplied to the boiler 6.

[0016] The main features of the combined plate heat exchange system of the present invention for marine thermal deoxidation waste heat utilization coupled with seawater desalination are:

[0017] (1) The system utilizes the waste heat of high-temperature deoxygenated water, eliminating excess energy consumption and improving the thermal efficiency of the overall system.

[0018] (2) The system adjusts the amount of high-temperature deaerator water entering the seawater heat exchanger and the soft water heat exchanger according to the temperature of the seawater to keep the temperature of the seawater entering the reverse osmosis equipment stable.

Claims

1. A combined plate heat exchange system for thermal deoxidation and waste heat utilization coupled with seawater desalination for marine use, characterized in that: It includes a reverse osmosis seawater desalination device, a deaerator, a seawater heat exchanger, a soft water heat exchanger, and a three-way temperature control valve. The seawater inlet end of the seawater heat exchanger is connected to seawater, and the seawater outlet end is connected to the reverse osmosis seawater desalination device, which is used for sending seawater into the seawater heat exchanger for heat exchange with high-temperature deoxygenated water and then entering the reverse osmosis seawater desalination device. The reverse osmosis seawater desalination device is connected to the soft water heat exchanger for seawater softening treatment, and the softened water is sent to the soft water heat exchanger for heat exchange with high-temperature deoxygenated water. The soft water heat exchanger is connected to the soft water heat exchanger and the seawater heat exchanger respectively after passing through the deaerator and the three-way temperature control valve, which is used for adjusting the temperature of the deoxygenated water entering the soft water heat exchanger and the seawater heat exchanger through the three-way temperature control valve. The deoxygenated water outlets of the soft water heat exchanger and the seawater heat exchanger are connected to boilers respectively.

2. The marine thermal deoxidation waste heat utilization coupled with seawater desalination combined plate heat exchange system according to claim 1 is characterized by: In the combined plate heat exchange system, seawater first enters the seawater heat exchanger to exchange heat with high-temperature deoxygenated water and then enters the reverse osmosis desalination device. After multiple treatments, it becomes softened water. The softened water enters the soft water heat exchanger to exchange heat with high-temperature deoxygenated water and then enters the deaerator to be processed into high-temperature deoxygenated water. After that, the three-way temperature control valve adjusts the amount of high-temperature water entering the seawater heat exchanger or the soft water heat exchanger according to the seawater inlet temperature, so as to keep the temperature of the seawater entering the reverse osmosis desalination device within the normal range.

3. The marine thermal deoxidation waste heat utilization coupled with seawater desalination combined plate heat exchange system according to claim 1 is characterized by: The combined plate heat exchange system is used in the marine deoxygenated water treatment system. It uses the waste heat of the high-temperature deoxygenated water to heat the low-temperature seawater, and has the adjustability to keep the temperature of the heated seawater stable.

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