CN108800980A - A kind of power plant's humidification type double-curve cooling column - Google Patents

Abstract

The present invention relates to the technical field of circulating water cooling in a thermal power plant, in particular to a hyperbolic cooling tower with a humidification type in a power plant, which includes a tower body in which a spray pipe, a packing layer and at least one layer of nozzles are sequentially arranged from top to bottom. The nozzle is connected to the water distribution pipe. The nozzle is an atomized booster nozzle. The pressure in front of the nozzle is not less than 0.18Mpa. There is an air inlet at the bottom of the side wall of the tower body. There is a sump at the bottom of the tower body. Constitute an atomized phase change humidification zone. On the basis of not changing the structure of the existing cooling tower, one or more layers of nozzles are added under the packing layer. The nozzles are atomized booster nozzles, which can vaporize part of the water and absorb heat from the rest of the water to start cooling. To achieve the effect of phase change, humidification and cooling, it can further increase the evaporation and heat dissipation of cooling water, reduce the temperature of the cooled water, or increase the amount of cooling water without changing the cooling temperature, or the superposition of the two effects.

Description

A Humidifying Hyperbolic Cooling Tower for Power Plants

technical field

The invention relates to the technical field of circulating water cooling in a thermal power plant, in particular to a humidification type hyperbolic cooling tower for a power plant.

Background technique

The hyperbolic counterflow natural draft cooling tower is the most widely used cooling equipment in the circulating water system of thermal power plants. As shown in Figure 1, the structure and principle of this cooling tower are as follows: a water distribution system 01 and a packing layer 02 are installed in the tower, and the packing layer 02 is located below the water distribution system 01, and the cooling water discharged from the outlet of the condenser is sent to The lower part of the tower body enters the water distribution system 01, and the water is sprayed out along the water distribution tank and water distribution pipe of the water distribution system 01. During the splashing and falling process, the cold air relies on the self-extraction force formed by the tower body from the air inlet 03 at the lower part of the tower body It is inhaled and flows in the opposite direction with the water droplets, and the air after absorbing heat is discharged into the atmosphere from the top of the tower. The cooling of cooling water mainly relies on evaporative cooling, followed by convective heat exchange cooling. The cooled water falls into the sump 04 at the lower part of the tower body, and is sent to the inlet of the circulation pump by the water ditch for reuse.

With the continuous increase of the capacity of the power plant unit, the water spraying area and tower height of the cooling tower are also increasing and increasing, resulting in the cooling tower working in summer, especially when the service life of the packing layer 02 becomes longer. The water temperature is easy to be too high, and it cannot reach the temperature under the design working conditions.

Contents of the invention

The technical problem to be solved by the present invention is to provide a power plant humidification type hyperbolic cooling tower, which can reduce the cooled water temperature without changing the structure of the existing cooling tower, so as to overcome the above-mentioned defects of the prior art.

In order to solve the above technical problems, the present invention adopts the following technical solutions: a power plant humidification type hyperbolic cooling tower, including a tower body, the tower body is sequentially provided with a spray pipe, a packing layer and at least one layer of nozzles from top to bottom, the nozzles It is connected with the water distribution pipe, the nozzle is an atomized booster nozzle, the pressure in front of the nozzle is not less than 0.18Mpa, the bottom of the side wall of the tower body is provided with an air inlet, and the bottom of the tower body is provided with a sump, and the area above the sump below the packing layer is composed of Atomized phase change humidification zone.

Preferably, the spray head is an atomized pressurized spray head with a pre-vacuum chamber.

Preferably, both the shower pipe and the water distribution pipe are connected to the same water inlet pipe, and the water inlet pipe has a hot water inlet.

Preferably, the spray pipe is connected with the first water inlet pipe, and the first water inlet pipe has a first hot water inlet; the water distribution pipe is connected with the second water inlet pipe, and the second water inlet pipe has a second hot water inlet.

Preferably, a mist eliminator is provided above the spray pipe in the tower body.

Compared with prior art, the present invention has remarkable progress:

On the basis of not changing the structure of the existing cooling tower, add one or more layers of nozzles under the filler layer. The nozzles are atomized booster nozzles. The pressure in front of the nozzles is not less than 0.18Mpa. Form a vacuum chamber to force a part of the water to vaporize, and absorb a large amount of heat from the rest of the water to achieve the effect of phase change, humidification and cooling, which can further increase the evaporation and heat dissipation of cooling water, and reduce the cooling in the humidification type hyperbolic cooling tower of the power plant. The temperature of the final water, or to increase the amount of cooling water without changing the cooling temperature, or the superposition of the two effects, so as to solve the problem of insufficient cooling water temperature drop in the existing cooling tower under summer working conditions.

Description of drawings

Fig. 1 is a structural schematic diagram of a hyperbolic cooling tower in a power plant in the prior art.

Fig. 2 is a schematic structural view of a power plant humidifying type hyperbolic cooling tower according to an implementation mode of the embodiment of the present invention.

Fig. 3 is a structural schematic diagram of a humidification type hyperbolic cooling tower for a power plant according to another embodiment of the embodiment of the present invention.

Fig. 4 is a schematic structural diagram of an atomizing booster nozzle according to an embodiment of the present invention.

Fig. 5 is a schematic structural view of the front cover of the atomizing booster nozzle according to the embodiment of the present invention.

FIG. 6 is a bottom view of FIG. 5 .

Fig. 7 is a schematic structural view of the rear cover of the atomizing booster nozzle according to the embodiment of the present invention.

Fig. 8 is a sectional view along line A-A in Fig. 7 .

FIG. 9 is a bottom view of FIG. 7 .

Fig. 10 is a schematic diagram of the water spraying angle of the atomizing pressurized nozzle according to the embodiment of the present invention.

In Figure 1:

01. Water distribution system 02. Packing layer

03. Air inlet 04. Water collection basin

In Figure 2 and Figure 10:

1. Tower body 10. Air inlet

2. Spray pipe 3. Packing layer

4. Atomizing booster nozzle 5. Water distribution pipe

6. Pool 7. Demister

8. Water inlet pipe 80. Hot water inlet

81. First water inlet pipe 810. First hot water inlet

82. Second water inlet pipe 820. Second hot water inlet

41. Back cover 411. Water inlet

412. Flow diversion structure 4121. Baffle

4122, deflector 413, first rib

42. Front cover 421. Water outlet

422. Swirl chamber 4221. Swirl blade part

423. Vacuum chamber 4231. Air hole

424, the second rib

Detailed ways

The specific implementation manners of the present invention will be described in further detail below in conjunction with the accompanying drawings. These embodiments are only used to illustrate the present invention, not to limit the present invention.

In the description of the present invention, it should be noted that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", " The orientations or positional relationships indicated by "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying Describes, but does not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and operate in a specific orientation, and therefore should not be construed as limiting the invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and should not be understood as indicating or implying relative importance.

In the description of the present invention, it should be noted that unless otherwise specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. Connected, or integrally connected; it may be mechanically connected or electrically connected; it may be directly connected or indirectly connected through an intermediary, and it may be the internal communication of two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention according to specific situations.

In addition, in the description of the present invention, unless otherwise specified, "plurality" means two or more.

As shown in Fig. 2 and Fig. 10, an embodiment of the power plant humidification type hyperbolic cooling tower of the present invention. Referring to Fig. 2 and Fig. 3, the power plant humidification type hyperbolic cooling tower of the present embodiment includes a tower body 1, and the tower body 1 is provided with a spray pipe 2, a packing layer 3 and at least one layer of nozzles 4 sequentially from top to bottom, The nozzle 4 is connected with the water distribution pipe 5, the nozzle 4 is an atomization pressurized nozzle, and the pressure in front of the nozzle 4 is not less than 0.18Mpa. The outlet of the nozzle 4 can be facing up or down, and it can be flexibly placed tiltedly or horizontally according to actual needs. It is preferred to spray upwards towards the packing layer 3, which can prolong the landing time, increase some convective heat transfer, and enhance some cooling effects. An air inlet 10 is opened at the bottom of the side wall of the tower body 1 . A sump 6 is arranged at the inner bottom of the tower body 1, and the cooled water falls into the sump 6 and can be sent to the inlet of the circulation pump for reuse. The area below the filler layer 3 and above the sump 6 , that is, the area between the filler layer 3 and the sump 6 constitutes an atomized phase change humidification zone. Part of the cooling water entering the humidification type hyperbolic cooling tower of the power plant flows into the spray pipe 2, sprays out from the spray pipe 2, passes through the packing layer 3, and then falls into the sump 6 at the bottom of the tower body 1, where the spray falls During the process, the cold air outside the tower body 1 enters the tower body 1 through the air inlet 10 and flows in the opposite direction with the water droplets, and the air after absorbing heat is discharged from the top of the tower body 1 into the atmosphere, so this part of cooling water is mainly cooled by evaporative cooling and cooling. Convective heat exchange cooling; the other part flows into the water spray pipe 5, sprays out from the nozzle 4 and partially vaporizes, and then falls into the water collection pool 6 at the bottom of the tower body 1 after passing through the packing layer 3. In addition to convective heat exchange and cooling, it is also cooled by atomization and vaporization of the nozzle 4, and the latent heat of vaporization of water is very large, which can absorb a large amount of heat from excess water, and the cooling effect is obvious. Thus, the temperature of the cooled water falling into the sump 6 at the bottom of the tower body 1 can be reduced to a relatively low temperature.

Therefore, in the power plant humidification type hyperbolic cooling tower of this embodiment, on the basis of not changing the structure of the existing cooling tower, one or more layers of nozzles 4 are added below the packing layer 3, and the nozzles 4 are atomized pressurized The nozzle, the pressure in front of the nozzle 4 is not less than 0.18Mpa, the water sprayed by the nozzle 4 rotates at a high speed, forming a vacuum chamber, forcing a part of the water to vaporize, and absorbing a large amount of heat from the rest of the water, which has the effect of phase change, humidification and cooling, and can further Increase the evaporation and heat dissipation of cooling water, reduce the temperature of the cooled water in the humidification type hyperbolic cooling tower of the power plant, or increase the amount of cooling water without changing the cooling temperature, or the superposition of the two effects, so as to solve the problem The existing hyperbolic cooling tower of the power plant has the problem of insufficient cooling water temperature drop under summer working conditions.

In this embodiment, the tower body 1 is provided with a demister 7 above the spray pipe 2, and the air in the tower body 1 after heat exchange with the cooling water and the water vapor generated by the evaporation of the cooling water are dewatered by the demister 7. After dehumidification, it is discharged from the top of the tower body 1 into the atmosphere.

In one embodiment, referring to FIG. 2 , both the spray pipe 2 and the water distribution pipe 5 communicate with the same water inlet pipe 8 , and the water inlet pipe 8 has a hot water inlet 80 . That is, the spray pipe 2 and the water distribution pipe 5 can share the same water distribution system.

In another embodiment, referring to FIG. 3 , the spray pipe 2 communicates with the first water inlet pipe 81, and the first water inlet pipe 81 has a first hot water inlet 810; the water distribution pipe 5 communicates with the second water inlet pipe 82, The second water inlet pipe 82 has a second hot water inlet 820 . That is, the spray pipe 2 and the water distribution pipe 5 can be independent water distribution systems, and cooling water is passed into the spray pipe 2 and the water distribution pipe 5 through the first water inlet pipe 81 and the second water inlet pipe 82 respectively.

The nozzle 4 in this embodiment can adopt the atomization booster nozzle 4 of the pre-vacuum chamber, referring to Fig. 4 to Fig. 9, the atomization booster nozzle 4 of the present embodiment includes a connected rear cover 41 and a front cover 42, The rear cover 41 is provided with a water inlet 411, the front cover 42 is provided with a water outlet 421, the rear cover 41 is provided with a diversion structure 412, and the front cover 42 is provided with a swirl chamber 422, the diversion structure 412 and the swirl chamber 422 communicates; the end of the water outlet 421 communicates with the vacuum chamber 423, and the diameter of the vacuum chamber 423 is greater than the diameter of the water outlet 421. See Figure 10, the height can be adjusted as needed, the sprayed water mist can cover the outlet of the vacuum chamber, see the angle β in Figure 10, usually the angle of sprayed water mist is ≥β; the sprayed water mist can also be smaller cone Angle ejection does not completely cover the outlet of the vacuum chamber, see angle α in Figure 10, and α<β. Referring to Fig. 4, the water flow enters from the water inlet 411 and flows in the direction M, and is divided into multiple water flows by the flow guide structure 412, and then the separated water flows are mixed by the swirl chamber 422, so that the water flow rotates from the water outlet 421 Entering into the vacuum chamber 423 along the direction N, the water flowing into the vacuum chamber 423 is fine liquid droplets, and part of the liquid droplets are vaporized under vacuum conditions. The side wall and/or bottom surface (not shown in the figure) of the vacuum chamber 423 are provided with several air holes 4231, the vacuum chamber 423 is in a negative pressure state, and the air holes 4231 can absorb the peripheral air flow of the nozzle to increase the friction between the gas and the water droplets , increase the heat release of high-temperature water to the surrounding air, and improve the cooling efficiency.

Referring to Fig. 4 and Fig. 5, preferably, one end of the water outlet 421 connected to the front cover 42 is cylindrical, and the other end connected to the vacuum chamber 423 is conical, and the cone angle of the cone is 20-45°, and the water flows through At the water outlet, the speed of the water flow is inversely proportional to the diameter of the pipe, so when the water flow passes through the tapered end of the water outlet 421, the speed will be accelerated, and the evaporation of water will be accelerated after spraying out to improve the cooling effect.

4 to 6, preferably, the swirl chamber 422 includes a plurality of swirl blades 4221 protruding from the inner wall of the front cover 42, the swirl blades 4221 are integrated with the front cover 42, and the swirl blades 4221 Arranged in an arc shape, furthermore, the swirl blades 4221 are crescent-shaped, which is convenient for introducing the separated water flows into the water outlet 421 for mixing. Evenly merge into the water outlet 421; one end of each swirl blade part 4221 is connected to the water outlet 421, and the other end is left with a distance from the inner wall of the front cover 42 to facilitate water flow and enter the corresponding two swirl blade parts 4221 between. Preferably, there are four swirl vane parts 4221 .

Referring to Fig. 4, Fig. 7 to Fig. 9, preferably, the flow guide structure 412 includes a baffle 4121 abutting on the swirl blade part 4221, and the baffle 4121 is connected to the rear cover 41 through the deflector 4122, and the deflector There are multiple 4122, which are evenly distributed along the circumferential direction near the water inlet 411, and there is a gap between the outer peripheral wall of the baffle plate 4121 and the side wall of the front cover 42. The water flow enters the nozzle from the water inlet 11 , directly impacts on the baffle 4121 , and then is divided into multiple streams by the deflector 4122 , and enters the swirl chamber 422 along the distance between the baffle 4121 and the front cover 42 .

Referring to Fig. 4, preferably, the rear cover 41 is provided with a plurality of first reinforcing ribs 413, and the plurality of first reinforcing ribs 413 are evenly distributed along the circumference of the water inlet 411 for strengthening the strength of the rear cover 41, and the first reinforcing ribs 413 is a right triangle, one of which is connected to the water inlet 41 , and the other is connected to the end surface of the rear cover 41 . The front cover 42 is provided with a plurality of second reinforcing ribs 424, and the plurality of second reinforcing ribs 424 are evenly distributed along the circumference of the water outlet 421 for strengthening the strength of the front cover 42. The second reinforcing ribs 424 are right-angled triangles, one of which The right-angled side is connected to the water outlet 421 , and the other right-angled side is connected to the end surface of the front cover 42 . Preferably, the rear cover 41 and the front cover 42 are connected by bolts, so as to facilitate the installation and disassembly of the spray head of the humidification type hyperbolic cooling tower of the power plant.

The above are only preferred embodiments of the present invention, and it should be pointed out that for those of ordinary skill in the art, some improvements and replacements can also be made without departing from the technical principle of the present invention, and these improvements and replacements should also be It is regarded as the protection scope of the present invention.

Claims (5)

1. a power plant humidification type hyperbolic cooling tower, is characterized in that, comprises tower body (1), is provided with spray pipe (2), packing layer (3) successively from top to bottom in described tower body (1) ) and at least one layer of nozzles (4), the nozzles (4) are connected to the water distribution pipe (5), the nozzles (4) are atomized booster nozzles, and the pressure in front of the nozzles (4) is not less than 0.18Mpa , the bottom of the side wall of the tower body (1) is provided with an air inlet (10), the inner bottom of the tower body (1) is provided with a sump (6), and the sump (6) below the packing layer (3) 6) The above area constitutes the atomization phase change humidification area. 2. The power plant humidification type hyperbolic cooling tower according to claim 1, characterized in that, the spray nozzle (4) is an atomization pressurized nozzle of a pre-vacuum chamber. 3. power plant humidification type hyperbolic cooling tower according to claim 1, is characterized in that, described shower pipe (2) and described water distribution pipe (5) all communicate with same water inlet pipe (8), so The water inlet pipe (8) has a hot water inlet (80). 4. The power plant humidification type hyperbolic cooling tower according to claim 1, characterized in that, the spray pipe (2) communicates with the first water inlet pipe (81), and the first water inlet pipe (81) There is a first hot water inlet (810); the water distribution pipe (5) communicates with the second water inlet pipe (82), and the second water inlet pipe (82) has a second hot water inlet (820). 5. The power plant humidification type hyperbolic cooling tower according to claim 1, characterized in that, a demister (7) is provided above the spray pipe (2) in the tower body (1).