CN102557176B - Sea water desalinating device of cooling tower of coastal and island thermal power plants - Google Patents

Abstract

The invention discloses a seawater desalination device for cooling towers of coastal and island thermal power plants, which includes a power generation steam circulation system composed of a boiler, a steam turbine, a condenser and a circulation pump, a cooling tower and a spray pipe, and a seawater cooling circulation pump , steam collector, air suction pump, steam condenser and fresh water tank. The seawater cooling circulation pump pumps seawater into the condenser to exchange heat with the exhaust gas of the steam turbine. The seawater is heated and evaporated into a mixture of steam and hot water. Spray downward from the spray pipe on the upper part of the cooling tower to exchange heat with the air. The water vapor is collected by the steam collector, and the water vapor in the lower part of the cooling tower is condensed into fresh water, which is sent to the fresh water tank and sprayed from the spray pipe. The drenched concentrated brine is discharged to the sea from the pool at the bottom of the cooling tower through the concentrated brine discharge pipe. The invention realizes the desalination treatment of seawater by simply modifying the cooling tower of the existing thermal power plant and utilizing the waste heat of thermal power generation.

Description

Coastal and island thermal power plant cooling tower seawater desalination device

technical field

The invention relates to a seawater desalination device, in particular to a seawater desalination device for cooling towers of coastal and island thermal power plants, which is used in the occasions where existing coastal and island thermal power plants are reconstructed for seawater desalination.

Background technique

Coastal and island people are in short supply of fresh water, and coastal and island thermal power plants will consume a large amount of fresh water, which makes coastal and island fresh water more tense. At the same time, a large amount of waste heat is wasted in the thermal power plant. The exhaust gas after the steam turbine in the thermal power plant is cooled by the condenser, and the cooling water of the condenser is cooled by air through the cooling tower, so a large amount of water vapor is discharged above the cooling tower. . the

Contents of the invention

The object of the present invention is to provide a seawater desalination device for cooling towers of coastal and island thermal power plants, which can perform seawater desalination treatment by utilizing the waste heat of thermal power generation through simple transformation of existing thermal power plant cooling towers.

To achieve the above object, the present invention can take the following technical solutions:

The present invention is a seawater desalination device for cooling towers of coastal and island thermal power plants, comprising a power generation steam circulation system composed of boilers, steam turbines, condensers, and circulating pumps, and cooling towers and spray pipes for cooling the condensers, Seawater cooling circulation pump, steam collector, air suction pump, steam condenser and fresh water tank are also provided. The seawater cooling circulation pump pumps seawater into the condenser from the seawater inlet pipe, and the seawater in the condenser Exchanging heat with the exhaust gas of the steam turbine, the seawater after heat exchange is heated and evaporated into a steam-hot water mixture, which is sent to the spray pipe on the upper part of the cooling tower to spray downwards, and the water from the cooling tower The air entering around the lower part of the tower performs heat exchange, and the water vapor heated and evaporated is discharged from the top of the cooling tower and collected by the steam collector, and sent to the steam condenser in the water pool at the lower part of the cooling tower by the air suction pump for condensation. The water vapor is condensed into fresh water, which is sent to the fresh water tank, and the concentrated brine sprayed from the spray pipe is discharged to the sea from the pool at the lower part of the cooling tower through the concentrated brine discharge pipe.

Compared with the prior art, the beneficial effect of the present invention is: due to the adoption of the above technical scheme, the cooling water of the condenser of the thermal power plant is used as the heat source to heat the seawater to obtain distilled water (fresh water), the cooling tower of the thermal power plant is used as the seawater evaporator, and the cooling tower is used The fresh water steam condenser is composed of the pool and the steam condenser. Through the simple transformation of the cooling tower of the existing thermal power plant, the desalination of seawater is realized by using the waste heat of thermal power generation.

Description of drawings

Fig. 1 is a schematic diagram of the structure of the present invention.

Detailed ways

As shown in Figure 1, a cooling tower seawater desalination device of a coastal and island thermal power plant of the present invention includes a power generation steam circulation system composed of a boiler 1, a steam turbine 2, a condenser 3, and a circulating pump 4, and for the condensed steam The cooling tower 7 and the spray pipe 8 that the device 3 cools down are also provided with a seawater cooling circulation pump 6, a steam collector 9, an air suction pump 10, a steam condenser 12 and a fresh water tank 14, and the seawater cooling circulation pump 6 uses the seawater The seawater is pumped into the condenser 3 from the seawater inlet pipe 5, and the seawater exchanges heat with the exhaust gas of the steam turbine 2 in the condenser 3, and the seawater after the heat exchange is heated and evaporated into a mixture of steam and hot water. The water mixture is sent to the spray pipe 8 on the upper part of the cooling tower 7 to spray downwards, and exchange heat with the air entering from the lower part of the cooling tower 7, and the water vapor heated and evaporated is discharged from the top of the cooling tower 7 and is described The steam collector 9 collects and is sent to the steam condenser 12 in the water pool at the bottom of the cooling tower 7 by the air suction pump 10 for condensation. The concentrated brine that drenches down is discharged to the sea through the concentrated brine discharge pipe 13 by the pool of cooling tower 7 bottoms.

Claims (1)

1. A seawater desalination device for cooling towers of coastal and island thermal power plants, comprising a power generation steam circulation system composed of a boiler (1), a steam turbine (2), a condenser (3), and a circulation pump (4), and for said The cooling tower (7) and the spray pipe (8) for the cooling of the condenser (3) are characterized in that it is also equipped with a seawater cooling circulation pump (6), a steam collector (9), an air suction pump (10), Steam condenser (12) and fresh water tank (14), the seawater cooling circulation pump (6) pumps seawater into the condenser (3) from the seawater inlet pipe (5), and the seawater is pumped into the condenser (3) ) to exchange heat with the exhaust steam of the steam turbine (2), the seawater after the heat exchange is heated and evaporated into a steam-hot water mixture, and the steam-hot water mixture is sent to the spray pipe on the upper part of the cooling tower (7) (8) Spray downwards and exchange heat with the air entering from the lower part of the cooling tower (7). The suction pump (10) is sent to the steam condenser (12) in the water pool at the lower part of the cooling tower (7) for condensation. ) sprayed under the concentrated brine is discharged to the sea through the concentrated brine discharge pipe (13) from the pool at the bottom of the cooling tower (7).

Images