CN210004860U - Natural ventilation wet type smoke discharging cooling tower and distributed smoke discharging device thereof - Google Patents
Natural ventilation wet type smoke discharging cooling tower and distributed smoke discharging device thereof Download PDFInfo
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- CN210004860U CN210004860U CN201920788719.4U CN201920788719U CN210004860U CN 210004860 U CN210004860 U CN 210004860U CN 201920788719 U CN201920788719 U CN 201920788719U CN 210004860 U CN210004860 U CN 210004860U
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Abstract
The utility model discloses an kind natural draft wet-type cooling tower that discharges fume and distributed fume extractor thereof, distributed fume extractor includes that the female pipe of flue gas sets up in the cooling tower to introduce the flue gas after the desulfurization in the cooling tower, a plurality of flue gas branch pipes set up on the female pipe of flue gas, in order to receive the follow the female exhaust flue gas of pipe of flue gas, and with its water conservancy diversion extremely the position department of being close to the tower wall in the cooling tower, a plurality of exhaust ports correspond the setting and are in a plurality of on the flue gas branch pipe, in order upwards to discharge the flue gas, the utility model discloses can make in flue gas and the cooling tower humid air mix more fully, enlarge the positive influence of flue gas to the cooling tower, and then increase cooling tower efficiency, effectively solve the flue gas energy utilization ratio that exists among the prior art low and the inhomogeneous scheduling problem in the flow field of cooling tower.
Description
Technical Field
The utility model relates to an kind of natural draft wet-type cooling tower that discharges fume and distributed fume extractor thereof belongs to thermal power factory flue gas emission technical field.
Technical Field
The performance of the cooling tower serving as important auxiliary equipment of a thermal power plant adopting Rankine cycle directly influences the economy and environmental protection of the whole generator set, the smoke tower and technology serving as energy-saving and emission-reducing technologies based on the cooling tower is gradually adopted by domestic and foreign thermal power plants due to excellent environmental protection and economy, the smoke tower and combines a chimney and a cooling tower into , the traditional chimney and auxiliary equipment thereof are omitted, and desulfurized clean smoke is directly discharged into the cooling tower.
The existing exhaust cooling tower smoke discharging mode is that smoke is guided into the center position of height in the cooling tower through a smoke main pipe and is discharged upwards in a centralized and vertical mode through smoke discharging ports, the smoke discharged in the center can block the flow of wet air in the cooling tower due to the fact that the wet air flow rate and the temperature of the center position of the cooling tower are relatively high, the smoke discharged in the cooling tower has higher temperature and speed compared with the wet air in the tower, part of wet air in the tower can be heated to generate extra buoyancy, momentum can be transferred to the wet air, the flow of the cooling tower can be increased in both aspects, and the efficiency of the cooling tower is further increased.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problems that natural draft wet-type smoke exhaust cooling towers and distributed smoke exhaust devices thereof are provided to solve the problems of low smoke energy utilization rate and uneven flow field in the cooling tower in the conventional smoke tower combination .
distributed smoke exhaust device, applied to natural ventilation wet smoke exhaust cooling tower, the distributed smoke exhaust device comprises:
the flue gas main pipe is arranged in the cooling tower so as to introduce the desulfurized flue gas into the cooling tower;
the flue gas branch pipes are arranged on the flue gas main pipe, so that flue gas discharged from the flue gas main pipe is received and guided to a position close to the tower wall in the cooling tower;
and the smoke outlets are correspondingly arranged on the smoke branch pipes so as to discharge smoke upwards.
The cooling tower is a hyperboloid cooling tower, and the inclination direction of the smoke exhaust port is equal to the extension direction of the side wall of the adjacent hyperboloid cooling tower.
The hyperboloid of hyperboloid cooling tower is the straight line curved surface, the axis direction of exhaust port is parallel with the generating line of the cooling tower straight line curved surface of the adjacent position department that flushes with the exhaust port, and a plurality of exhaust ports equipartition are in the flue gas female pipe constitutes vortex type exhaust port all around jointly.
The smoke exhaust is located at 1/3 level within the cooling tower.
The utility model discloses still provide kind of natural draft wet-type cooling towers that discharges fume, include:
a cooling tower;
a desulfurizing tower;
the distributed smoke exhaust device;
the end of the flue gas main pipe of the distributed smoke exhaust device is connected with the desulfurizing tower, and the other end is arranged in the cooling tower, so that the flue gas desulfurized by the desulfurizing tower is introduced into the cooling tower;
the flue gas branch pipe of the distributed smoke exhaust device receives the flue gas exhausted from the flue gas main pipe, guides the flue gas to a position close to the tower wall in the cooling tower, and exhausts the flue gas upwards from the smoke exhaust port.
The beneficial effects of the utility model are that the utility model discloses design distributed fume extractor on the basis of current natural draft wet-type cooling tower that discharges fume to introduce the flue gas after the desulfurization in the cooling tower and be close to the position department of tower wall and upwards discharge, can make in flue gas and the cooling tower humid air mix more fully, enlarge the positive influence of flue gas to the cooling tower, and then increase cooling tower efficiency, effectively solve the flue gas energy utilization rate that exists among the prior art low and the inhomogeneous scheduling problem in flow field in the cooling tower, especially the utility model discloses well flue gas discharge angle is parallel with the generating line of cooling tower, can make in the cooling tower produce the vortex form and flow, strengthens the suction force of cooling tower, the utility model discloses simple structure can enlarge the positive influence of flue gas to the cooling tower, improves the cooling efficiency of cooling tower, is applicable to the large-scale natural draft wet cooling tower of power plant that adopts the cigarette tower to close technique.
Drawings
FIG. 1 is a schematic diagram of a natural draft wet flue gas cooling tower employing distributed flue gas removal devices;
FIG. 2 is a sectional view taken along line A-A of FIG. 1;
FIG. 3 is a front view of a vortex type dispersion fume extractor;
FIG. 4 is a top view of a vortex type dispersion fume extractor;
FIG. 5 is a schematic representation of a hyperbolic cooling tower generatrix;
FIG. 6 is a schematic view of the angle of the smoke outlet of the vortex type dispersion smoke exhaust device;
in the drawings: the flue gas cooling tower comprises a main flue gas pipe 1, a branch flue gas pipe 2, a smoke outlet 3, a tower wall 4, a water distribution surface 5, a packing layer 6, a cooling tower inlet 7, a circulating water tank 8, a cooling tower outlet 9, an axis 10 and a bus 11.
Detailed Description
The present invention will be described in with reference to the accompanying drawings and examples, which are implemented in the prior art by using the present invention and the technical solution thereof, and the detailed embodiments and the specific operation procedures are given, but the scope of the present invention is not limited to the following examples.
Referring to fig. 1 and 2, according to an embodiment of the present invention, an distributed smoke evacuation apparatus is applied to a natural draft wet smoke evacuation cooling tower, which includes a tower wall 4, a water distribution surface 5, a packing layer 6, a cooling tower inlet 7, a circulating water tank 8 and a cooling tower outlet 9. the cooling tower has a working process in which circulating water to be cooled is sprayed downward from the water distribution surface 5, falls down to the packing layer 6 of the cooling tower under the action of gravity, and performs reverse heat and mass transfer with cold air entering from an air inlet, the air after absorbing heat moves upward and is discharged from the cooling tower outlet 9, and the circulating water drops after cooling fall into the water tank at the bottom of the tower, so that cooling is completed.
referring to fig. 1 to 4, the distributed smoke exhausting device includes a main smoke pipe 1, a plurality of branch smoke pipes 2 and a plurality of smoke outlets 3.
The main flue gas pipe 1 is of a tubular structure, the upper end of the main flue gas pipe is located at the position of 1/3 height in the cooling tower, and the position is usually located above a water distribution surface 5 in the cooling tower.
And the plurality of flue gas branch pipes 2 are arranged on the flue gas main pipe 1 and used for receiving the flue gas discharged from the flue gas main pipe 1 and guiding the flue gas to a position close to the tower wall 4 in the cooling tower. The flue gas branch pipe 2 mainly disperses the flue gas in the flue gas main pipe 1 to each position far away from the center in the cooling tower. Preferably, the branch flue gas pipes 2 are distributed from the upper end of the main flue gas pipe 1 to the periphery along the horizontal direction. Preferably, the flue gas branch pipes 2 are tubular structures and are uniformly distributed in the circumferential direction of the upper end of the flue gas main pipe 1. The flue gas branch pipe 2 and the flue gas main pipe 1 are connected by a conventional connection method, such as a socket joint method.
The smoke outlets 3 are correspondingly arranged on the smoke branch pipes 2 to discharge smoke upwards, in other words, smoke outlets 3 are arranged at the opening end part of each smoke branch pipe 2 to discharge smoke upwards, the smoke outlets 3 can be formed integrally with the smoke branch pipes 2 or manufactured in a split mode, and after the split mode is manufactured, the smoke outlets 3 are connected by a conventional connection mode, such as a butt connection mode, preferably, the smoke outlets 3 are located at the 1/3 height position in the cooling tower and are slightly higher than the upper end of the smoke main pipe 1.
In examples, distributed fume extractor comprises 1 flue gas main pipe 1 and 8 flue gas branch pipes 2, 3 elevation 35m of exhaust port, 1 diameter 5570mm of flue gas main pipe, 30mm of wall thickness, 2 diameters 1947mm of flue gas branch pipes, 30mm of wall thickness, 2 length 22.5m of each flue gas branch pipe, branch pipe curvature radius is 1.5D, the flue gas main pipe 1 and the flue gas branch pipes 2 adopt socket joint method to be connected, the flue gas branch pipes 2 and the exhaust port 3 adopt butt joint method to be connected.
The heat flow characteristic of the cooling tower is characterized in that: the temperature field and the velocity field in the cooling tower gradually decrease from the center to the edge. The rule of the influence of the flue gas on the cooling tower is as follows: the flue gas with higher temperature and speed can transfer heat energy and kinetic energy to the humid air in the cooling tower, and the heat buoyancy and speed of the humid air are increased. The utility model discloses a set up distributed fume extractor in the cooling tower, can make the wet air mix more abundant in flue gas and the cooling tower with the marginal position of flue gas water conservancy diversion to the cooling tower, enlarge the positive influence of flue gas to the cooling tower, and then increase cooling tower efficiency. Specifically, the distributed smoke exhaust device can increase the energy transfer of smoke to ascending air in the cooling tower, increase the speed of ascending air flow and increase the ventilation rate of the cooling tower by 4 to 8 percent.
Referring to fig. 5 and 6, a hyperboloid cooling tower is generally used in the art, and since the tower wall 4 of the hyperboloid cooling tower is a curved surface, the flue gas discharged from the smoke discharge port 3 may impact the tower wall 4, and further affect the suction force of the cooling tower, for this reason, the smoke discharge port 3 is set to have the inclined direction of the smoke discharge port 3 and the extending direction of the side wall of the adjacent hyperboloid cooling tower, at this time, a plurality of smoke discharge ports 3 uniformly distributed around the main flue gas pipe 1 jointly form a vortex-type smoke discharge port 3, and the flue gas discharged from the smoke discharge port 3 flows upwards along the tower wall 4, so that the suction force of the cooling tower is not weakened, but the suction force of the cooling tower can be increased.
More preferably, when the hyperboloid of the hyperboloid cooling tower is a straight curved surface, the axis 10 of the exhaust port 3 is parallel to the generatrix 11 of the straight curved surface of the cooling tower at the adjacent position flush with the exhaust port 3. that is, the exhaust port 3 is parallel to the generatrix 11 at the point of intersection of the axis and the tower wall 4, which extends outward from the axis at the same height of .
Fig. 5 is a schematic view of a hyperboloid-shaped cooling tower generatrix 11, the hyperboloid-shaped wall 4 generatrix 11 refers to inclined straight lines in a hyperboloid, the straight lines rotate around a fixed shaft to generate a hyperboloid, and the hyperboloid is a straight-line curved surface, fig. 5 is a schematic view of an angle of a smoke outlet 3 of a vortex-type distributed smoke exhaust device, wherein the direction of a y axis is the direction of an axis 10 of a cooling tower, and the angle of the axis 10 of the smoke outlet 3 with an angle and an x axis, a y axis and a z axis is.
Because the central line of the smoke outlet 3 (the axis 10) and the generatrix 11 of the hyperboloid tower wall 4 are kept , the arrangement mode can enable the smoke discharged from the smoke outlet 3 to flow in parallel with the tower wall 4 of the cooling tower and enable the smoke to generate tangential velocity, so that the smoke drives the wet air in the tower to rise in a vortex shape without impacting the tower wall 4, the suction force of the cooling tower is further improved, and the ventilation quantity of the cooling tower can be increased by 6 to 18 percent.
Specifically, the vortex-like flow creates a low pressure region at the cooling tower outlet 9, which causes the cooling tower to generate an additional draft Δ H, which is expressed as follows
The right-hand term of the equation is the kinetic energy of the flue gas absorption in the vertical direction, and the second term is the pressure drop over the outlet 9 of the cooling tower caused by the tangential velocity, where ηYIs a conservation factor of momentum in the vertical direction, vYJIs a cigaretteVelocity component of gas in vertical direction, vθAs tangential velocity, pinFor the density of the air in the cooling tower, AJnAnd A is the jet flow influence area and the sectional area of the cooling tower respectively, and epsilon is a jet flow characteristic parameter.
Claims (5)
1, decentralized flue gas device for use in a natural draft wet flue gas cooling tower, characterized in that, the decentralized flue gas device comprises:
the flue gas main pipe (1) is arranged in the cooling tower so as to introduce the desulfurized flue gas into the cooling tower;
the plurality of flue gas branch pipes (2) are arranged on the flue gas main pipe (1) and used for receiving the flue gas discharged from the flue gas main pipe (1) and guiding the flue gas to a position close to a tower wall (4) in the cooling tower;
and the smoke outlets (3) are correspondingly arranged on the smoke branch pipes (2) so as to discharge smoke upwards.
2. Decentralized smoke evacuation device according to claim 1, wherein the cooling tower is a hyperboloid cooling tower, and the inclination direction of the smoke evacuation opening (3) is in line with the side wall extension direction of the adjacent hyperboloid cooling tower.
3. The distributed smoke exhaust device according to claim 2, wherein the hyperboloid of the hyperboloid cooling tower is a straight curved surface, the axis (10) direction of the smoke exhaust port (3) is parallel to a generatrix (11) of the straight curved surface of the cooling tower at the adjacent position flush with the smoke exhaust port (3), and a plurality of smoke exhaust ports (3) are uniformly distributed around the smoke main pipe (1) to jointly form a vortex-type smoke exhaust port (3).
4. Decentralized smoke evacuation device according to claim 1, characterized in that the smoke exhaust (3) is located at 1/3 level inside the cooling tower.
5, a natural draft wet flue gas cooling tower comprising:
a cooling tower;
a desulfurizing tower;
distributed fume removal apparatus as claimed in any of claims 1 to 4;
the end of the flue gas main pipe (1) of the distributed smoke exhaust device is connected with the desulfurizing tower, and the other end end is arranged in the cooling tower so as to introduce the flue gas desulfurized by the desulfurizing tower into the cooling tower;
the flue gas branch pipe (2) of the distributed smoke exhaust device receives the flue gas exhausted from the flue gas main pipe (1), guides the flue gas to a position close to a tower wall (4) in the cooling tower, and exhausts the flue gas upwards from the smoke exhaust port (3).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920788719.4U CN210004860U (en) | 2019-05-29 | 2019-05-29 | Natural ventilation wet type smoke discharging cooling tower and distributed smoke discharging device thereof |
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| CN201920788719.4U CN210004860U (en) | 2019-05-29 | 2019-05-29 | Natural ventilation wet type smoke discharging cooling tower and distributed smoke discharging device thereof |
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| CN210004860U true CN210004860U (en) | 2020-01-31 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110068244A (en) * | 2019-05-29 | 2019-07-30 | 贵州电网有限责任公司 | Natural ventilating wet-type exhaust cooling tower and its distributing fume extractor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110068244A (en) * | 2019-05-29 | 2019-07-30 | 贵州电网有限责任公司 | Natural ventilating wet-type exhaust cooling tower and its distributing fume extractor |
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