Sea water desalinization method by waste heat recovery

A waste heat recovery and seawater technology, applied in chemical instruments and methods, seawater treatment, general water supply conservation, etc., can solve the problems of large power consumption, small operating flexibility, high investment, etc., to increase temperature, increase heat transfer speed, and save energy Effect

Inactive Publication Date: 2017-05-24
王良开
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the multi-stage flash seawater desalination process has high investment, high power consumption, and small operating flexibility of the equipment, so it is not suitable for occasions with large changes in water production; the heat transfer efficiency is low

Method used

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  • Sea water desalinization method by waste heat recovery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A seawater desalination method with waste heat recovery, comprising the following steps:

[0029] 1) Use the boiler flue gas to exchange heat with the low-pressure exhaust steam of the steam turbine, and the low-pressure exhaust steam after heat exchange is used as power steam;

[0030] 2) The power steam is passed into the heater of the multi-stage flash evaporation device to heat the raw seawater;

[0031] 3) The heated seawater sprays atomized seawater into the first-stage flash chamber through the water injector,

[0032] ① The atomized seawater evaporates rapidly under low pressure, and after the steam passes through the vapor-liquid separation device in the flash chamber, it condenses in contact with the condensing tube bundle to obtain fresh water with low salt content;

[0033] ②Atomized seawater enters the flash chamber under high-speed jetting, and small liquid droplets collide with each other and the wall of the vessel to form droplets and fall into the brin...

Embodiment 2

[0036] A seawater desalination method with waste heat recovery, comprising the following steps:

[0037] 1) Use the boiler flue gas to exchange heat with the low-pressure exhaust steam of the steam turbine, and the low-pressure exhaust steam after heat exchange is used as power steam;

[0038] 2) The power steam is passed into the heater of the multi-stage flash evaporation device to heat the raw seawater;

[0039] 3) The heated seawater sprays atomized seawater into the first-stage flash chamber through the water injector,

[0040] ① The atomized seawater evaporates rapidly under low pressure, and after the steam passes through the vapor-liquid separation device in the flash chamber, it condenses in contact with the condensing tube bundle to obtain fresh water with low salt content;

[0041] ②Atomized seawater enters the flash chamber under high-speed jetting, and small liquid droplets collide with each other and the wall of the vessel to form droplets and fall into the brin...

Embodiment 3

[0045] Such as figure 1 As shown, a waste heat recovery seawater desalination device includes a boiler 1 and a multi-stage flash device, and the multi-stage flash device includes a heater 3 and a multi-stage flash chamber,

[0046] The steam outlet of the boiler 1 is connected to the steam inlet of the steam turbine 2, and the flue gas outlet of the boiler 1 is connected to the flue gas inlet of the flue gas heat exchanger 4; the low-pressure exhaust steam outlet of the steam turbine 2 exchanges heat with the flue gas The steam inlet of the device 4 is connected, the steam outlet of the flue gas heat exchanger 4 is connected to the medium inlet of the heater 3, and the medium outlet of the heater 3 is connected to the water inlet of the boiler 1; the outlet pipe of the heater is connected to the first stage The flash chamber of the flash chamber is connected by a water injector 5, and the brine tank 6 of the previous flash chamber in two adjacent flash chambers is also connect...

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Abstract

The invention belongs to the field of sea water desalinization, and particularly relates to a sea water desalinization method by utilizing an industrial waste heat combined multi-stage flash evaporation device, and a device applied to the method. In order to solve the problems existing in the prior art, the invention provides the sea water desalinization method by taking industrial waste heat as a heat source and with adjustable elastic change of water production capacity, and the corresponding device. Particularly, the sea water desalinization method by waste heat recovery adopts the technical scheme that the method comprises the following steps that 1) flue gas of a boiler and low-pressure dead steam of a steam turbine perform heat exchange and then the low-pressure dead steam serves as power steam; 2) the power steam is supplied to a heater of the multi-stage flash evaporation device to heat raw sea water; 3) the heated sea water is sprayed into a first-stage flash evaporation chamber by a water injector; and 4) the sea water in a brine tank is sprayed into a next-stage flash evaporation chamber by the action of a water injector of the next-stage flash evaporation chamber until strong brine is discharged by a final-stage flash evaporation chamber.

Description

technical field [0001] The invention belongs to the field of seawater desalination, and in particular relates to a method for desalination of seawater by utilizing industrial waste heat combined with a multi-stage flash evaporation device, and a device applicable to the method. Background technique [0002] Seawater desalination is the use of seawater desalination to produce fresh water. It is an open-source incremental technology to realize the utilization of water resources, which can increase the total amount of fresh water without being affected by time, space and climate, and can guarantee stable water supply such as drinking water for coastal residents and replenishment water for industrial boilers. [0003] There are more than 20 kinds of seawater desalination technologies in the world, including reverse osmosis, low multi-effect, multi-stage flash evaporation, electrodialysis, pressure steam distillation, dew point evaporation, hydropower cogeneration, thermal membra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/06C02F1/16C02F103/08
CPCC02F1/06C02F1/16C02F2103/08Y02A20/124
Inventor 王鹏王良开
Owner 王良开
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