A heating furnace cooling device

Abstract

The application relates to the technical field of flue gas heat recovery equipment, in particular to a heating furnace cooling device which comprises a cavity, a motor, a liquid receiving hopper, a mixing cavity, a movable cavity and a heat insulation cavity, the upper and lower ends of the cavity are respectively provided with a spraying pipe and a flue, a liquid discharge pipe is arranged at the bottom of the cavity, the motor is fixedly arranged at the top end of the cavity, a first fan blade is arranged on the rotating shaft of the motor, a second fan blade and a stirring blade are arranged in the liquid receiving hopper, the mixing cavity is arranged at the top of the cavity, the movable cavity is cooperated with the mixing cavity and a connecting pipe at two ends, and the heat insulation cavity surrounds the side of the cavity. The device directly contacts the flue gas with the water mist-shaped heat conducting medium without a medium layer in the middle, the contact area is large, the heat exchange rate is fast, the cooling and heat recovery of the flue gas can be rapidly completed, the position of the movable cavity and the rotating speed of the stirring blade can be self-adaptively adjusted according to the flue gas inflow, and the flue gas and the adaptive amount of the heat conducting medium can be fully mixed to complete the heat exchange and cooling process.

Description

Technical Field

[0001] This invention relates to the field of flue gas heat recovery equipment, and in particular to a furnace cooling device. Background Technology

[0002] The core of an industrial furnace is to use fuel combustion or electrical energy to convert into heat, thereby heating materials or workpieces to the required temperature. The flue gas emitted by the furnace still has an extremely high temperature, and direct discharge will lead to low heat utilization efficiency. Therefore, it is necessary to recover the waste heat of the flue gas to achieve energy saving and cost reduction.

[0003] Existing flue gas cooling and heat recovery technologies struggle to dynamically match the heat transfer medium with the flue gas flow rate. When operating conditions fluctuate, this can easily lead to uneven cooling, insufficient waste heat recovery, or excessive consumption of the medium. Furthermore, the uniformity and turbulence of the mixing between the heat transfer medium and the flue gas are insufficient, resulting in inadequate heat exchange efficiency and uneven temperature distribution. The generated thermal stress can easily cause component deformation and damage.

[0004] Therefore, how to design a heating furnace flue gas cooling device that can achieve efficient and uniform mixing of flue gas and cooling medium, adapt to changes in operating conditions, deeply recover sensible and latent heat of flue gas, and has a compact structure and stable operation has become a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0005] The purpose of this invention is to provide a cooling device for a heating furnace to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: including a cavity, a motor, a liquid receiving hopper, a mixing cavity, a movable cavity, and a heat insulation cavity. The upper and lower ends of the cavity are respectively provided with a spray pipe for inputting the heat-conducting medium and a flue for inputting flue gas. The spray pipe and the flue are respectively connected to an external pipe for connecting the heat-conducting medium and a pipe for connecting the exhaust port of the heating furnace. The heat-conducting medium can be heat-conducting oil or water. A drain pipe is provided at the bottom of the cavity for discharging the heat-conducting medium that has completed heat exchange. The motor is fixedly installed at the top of the cavity. A first fan blade is provided on the motor shaft. The motor drives the first fan blade to rotate rapidly so that the water mist of the heat-conducting medium is fully mixed with the flue gas, thereby achieving rapid cooling of the flue gas.

[0007] The liquid receiving hopper is in the shape of an inverted cone. The liquid receiving hopper is used to receive excess heat-conducting medium dripping from the spray pipe. A rotating shaft is provided inside the liquid receiving hopper to form a rotating pair with the liquid receiving hopper. A second fan blade and a stirring blade are respectively provided at the upper and lower ends of the rotating shaft. The second fan blade can be driven by the airflow caused by the first fan blade. Since the second fan blade and the stirring blade are an integrated structure, the stirring blade can also rotate synchronously when the second fan blade rotates, driving the heat-conducting medium in the liquid receiving hopper to rotate rapidly.

[0008] The mixing chamber is located at the top of the cavity, and provides a place for the flue gas and the heat-conducting medium water mist to be fully mixed and exchanged.

[0009] One end of the movable cavity is located inside the mixing cavity and forms a sliding pair with the mixing cavity. The other end of the movable cavity forms a sleeve, and a connecting pipe that forms a sliding pair with the sleeve is provided inside the sleeve. The connecting pipe is used to communicate with an external pipeline to transfer the cooled flue gas. In specific implementations, a wire mesh defoaming gas can also be provided at the connecting pipe to reduce the amount of water mist passing through the connecting pipe. The moving direction of the connecting pipe is the same as the moving direction of the movable cavity. A corrugated plate is provided inside the movable cavity. The corrugated plate refers to a corrugated plate structure in the prior art. Its purpose is to make the heat-conducting medium droplets and flue gas fully mix to complete heat exchange. The corrugated plate is prior art and is known to those skilled in the art. Therefore, the specific shape and material of the corrugated plate will not be explained.

[0010] The heat insulation cavity surrounds the side of the cavity, and its upper and lower ends are connected to the bottom of the mixing cavity and the bottom of the cavity, respectively. The heat insulation cavity is used to isolate the cavity from direct contact with the outside, reduce the loss of heat energy from the cavity surface, and at the same time, the heat-conducting medium in the heat insulation cavity can absorb the lost heat energy and improve the heat energy utilization efficiency.

[0011] To optimize the above technical solution, further measures are taken, including: a liquid receiving ring, which is set in the cavity and connected to the cavity in the circumferential direction. An inclined guide ring is formed in the center of the liquid receiving ring, and the guide ring is matched with the bottom end of the liquid receiving hopper. Channels are opened on the cavity and the heat insulation cavity so that the heat-conducting medium on the liquid receiving ring can enter the heat insulation cavity through the channels. The liquid receiving ring is used to receive the heat-conducting medium that is spilled from the circumference of the liquid receiving hopper. At the same time, the guide ring in the middle of the liquid receiving ring can play a role in concentrating and guiding the flue gas, so that the flue gas is concentrated and passes through the guide ring.

[0012] As a further improvement to the above technical solution: a third fan blade is also provided in the movable cavity. The third fan blade is rotatable in the movable cavity and forms a rotating pair with the movable cavity. The third fan blade can rotate rapidly under the action of airflow, which helps to form a smaller heat-conducting medium water mist. At the same time, the rapidly rotating third fan blade, in combination with the corrugated plate, can effectively improve the turbulence in the movable cavity, which helps to improve the mixing degree of flue gas and heat-conducting medium water mist and accelerate the cooling of flue gas.

[0013] As a further improvement to the technical solution: the flue passes through the insulation cavity so that the sides of the flue are surrounded by the insulation cavity. The purpose of this structural design is that the heat emitted by the flue when it passes through the insulation cavity can be initially absorbed by the heat-conducting medium inside the insulation cavity.

[0014] As an improvement to the aforementioned technical solution: the mixing chamber is inclined upwards. When the atomized droplets of the heat-conducting medium collide with each other to form large droplets, the droplets can slide naturally down the inclined mixing chamber into the heat insulation chamber under the action of gravity.

[0015] Furthermore, the mixing chambers are evenly spaced and surround the liquid receiving hopper on the side of the chamber. This design is intended to ensure that the heat-conducting medium water mist thrown out from the liquid receiving hopper can be accurately delivered to the mixing chamber.

[0016] Preferably, an atomizing nozzle is provided at the end of the spray pipe, and the orthographic projection of the spray pipe on the liquid receiving hopper is surrounded by the liquid receiving hopper. The heat-conducting medium will be in the form of water mist after leaving the atomizing nozzle.

[0017] As can be seen from the above description of the structure of the present invention, compared with the prior art, the present invention has the following advantages:

[0018] A. The water mist-like heat-conducting medium is in direct contact with the flue gas without a medium layer in between. This not only results in a large contact area but also a fast heat exchange rate, which can quickly cool the flue gas and recover heat energy.

[0019] B. The position of the movable cavity and the rotation speed of the stirring blades can be adaptively adjusted according to the flue gas inlet to ensure that the flue gas and the appropriate amount of heat transfer medium can be fully mixed to complete the heat exchange and cooling process;

[0020] C. The thorough mixing of the water mist-like heat-conducting medium with the flue gas not only ensures rapid heat exchange efficiency but also ensures uniform heat distribution during the heat exchange process. This prevents excessive local temperature differences and avoids weld cracking and component deformation caused by huge thermal stress. Attached Figure Description

[0021] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0022] Figure 1 This is a schematic diagram of the three-dimensional cross-section of the present invention;

[0023] Figure 2 This is a schematic diagram of the three-dimensional structure of the present invention;

[0024] Figure 3 for Figure 1 A magnified schematic diagram of the three-dimensional structure.

[0025] Figure 4 This is a schematic diagram of the front cross-section structure of the present invention;

[0026] Figure 5 for Figure 4 A partially enlarged structural diagram;

[0027] In the diagram: Cavity-100, Spray pipe-101, Flue-102, Drain pipe-103, Atomizing nozzle-104, Motor-200, First fan blade-201, Liquid receiving hopper-300, Rotating shaft-301, Second fan blade-302, Stirring blade-303, Mixing chamber-400, Movable chamber-500, Sleeve-501, Connecting pipe-502, Corrugated plate-503, Third fan blade-504, Insulation chamber-600, Liquid receiving ring-700, Guide ring-701, Channel-702 Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Example 1

[0029] Please see Figure 1-5 The present invention provides a heating furnace cooling device, including a cavity 100, a motor 200, a liquid receiving hopper 300, a mixing chamber 400, a movable chamber 500, and a heat insulation chamber 600. The upper and lower ends of the cavity 100 are respectively provided with a spray pipe 101 for inputting heat-conducting medium and a flue 102 for inputting flue gas. The end of the spray pipe 101 is provided with an atomizing nozzle 104. The orthographic projection of the spray pipe 101 on the liquid receiving hopper 300 is surrounded by the liquid receiving hopper 300. The bottom of the cavity 100 is provided with a drain pipe 103.

[0030] The motor 200 is fixedly mounted on the top of the cavity 100, and the first fan blade 201 is mounted on the rotating shaft of the motor 200;

[0031] The liquid receiving hopper 300 is in the shape of an inverted cone. A rotating shaft 301 is provided inside the liquid receiving hopper 300 to form a rotating pair with the liquid receiving hopper 300. A second fan blade 302 and a stirring blade 303 are respectively provided at the upper and lower ends of the rotating shaft 301.

[0032] The mixing chamber 400 is located at the top of the cavity 100 and is inclined upward. The mixing chambers 400 are evenly distributed on the side of the cavity 100, surrounding the liquid receiving hopper 300.

[0033] One end of the movable cavity 500 is located inside the mixing cavity 400 and forms a sliding pair with the mixing cavity 400. The other end of the movable cavity 500 forms a sleeve 501. A connecting pipe 502, which forms a sliding pair with the sleeve 501, is provided inside the sleeve 501. The moving direction of the connecting pipe 502 is the same as the moving direction of the movable cavity 500. A corrugated plate 503 is provided inside the movable cavity 500. A third fan blade 504 is also provided inside the movable cavity 500. The third fan blade 504 is rotatable inside the movable cavity 500 and forms a rotating pair with the movable cavity 500.

[0034] The heat insulation cavity 600 surrounds the side of the cavity 100. The upper and lower ends of the heat insulation cavity 600 are connected to the bottom of the mixing cavity 400 and the bottom of the cavity 100, respectively. The flue 102 passes through the heat insulation cavity 600 so that the side of the flue 102 is surrounded by the heat insulation cavity 600. Example 2

[0035] Please see Figure 1-5 The present invention provides a cooling device for a heating furnace, comprising a cavity 100, a motor 200, a liquid receiving hopper 300, a mixing chamber 400, a movable chamber 500, a heat insulation chamber 600, and a liquid receiving ring 700. The upper and lower ends of the cavity 100 are respectively provided with a spray pipe 101 for inputting a heat-conducting medium and a flue 102 for inputting flue gas. The end of the spray pipe 101 is provided with an atomizing nozzle 104. The orthographic projection of the spray pipe 101 on the liquid receiving hopper 300 is surrounded by the liquid receiving hopper 300. The bottom of the cavity 100 is provided with a drain pipe 103.

[0036] The motor 200 is fixedly mounted on the top of the cavity 100, and the first fan blade 201 is mounted on the rotating shaft of the motor 200;

[0037] The liquid receiving hopper 300 is in the shape of an inverted cone. A rotating shaft 301 is provided inside the liquid receiving hopper 300 to form a rotating pair with the liquid receiving hopper 300. A second fan blade 302 and a stirring blade 303 are respectively provided at the upper and lower ends of the rotating shaft 301.

[0038] The mixing chamber 400 is located at the top of the cavity 100 and is inclined upward. The mixing chambers 400 are evenly distributed on the side of the cavity 100, surrounding the liquid receiving hopper 300.

[0039] One end of the movable cavity 500 is located inside the mixing cavity 400 and forms a sliding pair with the mixing cavity 400. The other end of the movable cavity 500 forms a sleeve 501. A connecting pipe 502, which forms a sliding pair with the sleeve 501, is provided inside the sleeve 501. The moving direction of the connecting pipe 502 is the same as the moving direction of the movable cavity 500. A corrugated plate 503 is provided inside the movable cavity 500. A third fan blade 504 is also provided inside the movable cavity 500. The third fan blade 504 is rotatable inside the movable cavity 500 and forms a rotating pair with the movable cavity 500.

[0040] The heat insulation cavity 600 surrounds the side of the cavity 100. The upper and lower ends of the heat insulation cavity 600 are connected to the bottom of the mixing cavity 400 and the bottom of the cavity 100, respectively. The flue 102 passes through the heat insulation cavity 600 so that the side of the flue 102 is surrounded by the heat insulation cavity 600.

[0041] The liquid receiving ring 700 is disposed circumferentially within the cavity 100 and connected to the cavity 100. An inclined guide ring 701 is formed at the center of the liquid receiving ring 700. The guide ring 701 is matched with the bottom end of the liquid receiving hopper 300. The cavity 100 and the heat insulation cavity 600 are provided with a channel 702 so that the heat-conducting medium on the liquid receiving ring 700 can enter the heat insulation cavity 600 through the channel 702.

[0042] Working principle: For Embodiment 1 and Embodiment 2, when the flue gas flows through the insulation chamber 600 in the flue 102, the heat-conducting medium in the insulation chamber 600 can initially absorb the heat of the flue gas. Then, the flue gas enters the chamber 100, impacts the bottom of the liquid receiving hopper 300, and disperses along the bottom of the liquid receiving hopper 300. During the process, the first fan blade 201 is driven by the motor 200, and the spray pipe 101 sprays the heat-conducting medium downwards. When the heat-conducting medium comes into contact with the first fan blade 201, it will be impacted and dispersed into a water mist. The water mist heat-conducting medium and the flue gas are sent into the mixing chamber 400 by the first fan blade 201. In the mixing chamber 400, they are fully mixed and heat exchange is completed. Then, the flue gas and a small amount of water mist that have completed heat exchange leave through the connecting pipe 502 connected to the external pipe. The heat-conducting medium slides down the inclined mixing chamber 400 and enters the insulation chamber 600, and finally leaves from the drain pipe 103.

[0043] After the heat transfer medium leaves the spray pipe 101, part of it impacts the rotating first fan blade 201 to form a water mist, and the remaining part falls and is collected by the liquid receiving hopper 300. When the first fan blade 201 rotates, the second fan blade 302 will be driven to rotate due to the airflow. The second fan blade 302 and the stirring blade 303 located below the second fan blade 302 will generate synchronous movement to stir the heat transfer medium collected by the liquid receiving hopper 300. The flue gas intake mainly depends on the first fan blade 201. If the flue gas intake needs to be increased, the speed of the motor 200 is increased, which increases the amount of flue gas driven by the first fan blade 201. At this time, the speed of the stirring blade 303 increases, and the heat transfer medium can move upward along the inclined liquid receiving hopper 300, and finally be struck by the first fan blade 201 to form a richer water mist. If the flue gas intake needs to be reduced, the speed of the motor 200 is reduced, which reduces the amount of flue gas driven by the first fan blade 201. At this time, the speed of the stirring blade 303 decreases, and the height of the heat transfer medium on the inclined liquid receiving hopper 300 decreases, reducing the amount of water mist caused by the impact of the heat transfer medium on the first fan blade 201. The amount of water mist heat transfer medium can be automatically increased according to the flue gas volume to ensure that the flue gas is cooled evenly and to avoid uneven cooling problems.

[0044] When flue gas and water mist (the heat transfer medium) enter the mixing chamber 400, they drive the third fan blade 504 to rotate. The rotating third fan blade 504, in conjunction with the corrugated plate 503, increases the turbulence, ensuring thorough mixing of the flue gas and water mist for heat exchange. Simultaneously, the rotating third fan blade 504 captures water mist and flue gas, forming large droplets. These droplets then separate from the third fan blade 504 under centrifugal force and enter the insulation chamber 600. If the flue gas flow increases, the movable chamber 500 is pushed by the flue gas, increasing the volume of both the mixing chamber 400 and the movable chamber 500, which helps to ensure thorough mixing of the flue gas and water mist. If the flue gas flow decreases, the movable chamber 500 slides under gravity, reducing the volume of both the mixing chamber 400 and the movable chamber 500. The volume can be automatically adjusted according to the flue gas flow to ensure sufficient cooling of the flue gas and prevent uneven temperature distribution.

[0045] The water mist-like heat-conducting medium comes into direct contact with the flue gas, without any intermediate medium such as pipes, thus resulting in a fast heat exchange rate. In Example 2, the guide ring 701 on the liquid receiving ring 700 can confine the flue gas, ensuring that the flue gas can be evenly dispersed along the liquid receiving hopper 300. At the same time, the heat-conducting medium dripping from the liquid receiving hopper 300 can be received by the liquid receiving ring 700. This heat-conducting medium can leave through the channel 702 and enter the heat insulation cavity 600. During this process, the heat-conducting medium can form a liquid film on the side of the cavity 100, reducing the loss of heat along the surface of the cavity 100 and improving the heat recovery rate. At the same time, the liquid film can also balance the surface temperature of the cavity 100, avoiding uneven temperature distribution on the surface of the cavity 100.

[0046] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0047] Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0048] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0049] The control method of this invention is to achieve automatic control through an external controller. The control circuit of the controller can be implemented by simple programming by those skilled in the art. The power supply is also common knowledge in the field. Furthermore, since this invention is mainly used to protect mechanical devices, the control method and circuit connection will not be explained in detail here.

[0050] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A cooling device for a heating furnace, characterized in that, include: The cavity (100) is provided with a spray pipe (101) for inputting heat-conducting medium and a flue (102) for inputting flue gas at the upper and lower ends, respectively. A drain pipe (103) is provided at the bottom of the cavity (100). The motor (200) is fixedly installed at the top of the cavity (100), and the first fan blade (201) is provided on the shaft of the motor (200). A liquid receiving hopper (300) is in the shape of an inverted cone. A rotating shaft (301) is provided inside the liquid receiving hopper (300) to form a rotating pair with the liquid receiving hopper (300). A second fan blade (302) and a stirring blade (303) are respectively provided at the upper and lower ends of the rotating shaft (301). An atomizing nozzle (104) is provided at the end of the spray pipe (101). The orthographic projection of the spray pipe (101) on the liquid receiving hopper (300) is surrounded by the liquid receiving hopper (300). A mixing chamber (400) is disposed at the top of the cavity (100); A movable cavity (500) is provided. One end of the movable cavity (500) is located inside the mixing cavity (400) and forms a sliding pair with the mixing cavity (400). The other end of the movable cavity (500) is formed with a sleeve (501). A connecting pipe (502) is provided inside the sleeve (501) and forms a sliding pair with the sleeve (501). The moving direction of the connecting pipe (502) is the same as the moving direction of the movable cavity (500). A corrugated plate (503) is provided inside the movable cavity (500). The heat insulation cavity (600) surrounds the side of the cavity (100), and the upper and lower ends of the heat insulation cavity (600) are respectively connected to the bottom of the mixing cavity (400) and the bottom of the cavity (100).

2. The furnace cooling device according to claim 1, characterized in that: It also includes a liquid receiving ring (700), which is circumferentially connected to the cavity (100) inside the cavity (100). An inclined guide ring (701) is formed at the center of the liquid receiving ring (700), and the guide ring (701) is matched with the bottom end of the liquid receiving hopper (300). The cavity (100) and the heat insulation cavity (600) are provided with channels (702) so that the heat-conducting medium on the liquid receiving ring (700) can enter the heat insulation cavity (600) through the channels (702).

3. The furnace cooling device according to claim 1, characterized in that: A third fan blade (504) is also provided inside the movable cavity (500). The third fan blade (504) is rotatable inside the movable cavity (500) and forms a rotating pair with the movable cavity (500).

4. A furnace cooling device according to any one of claims 1-3, characterized in that: The flue (102) passes through the insulation cavity (600), so that the side of the flue (102) is surrounded by the insulation cavity (600).

5. A furnace cooling device according to any one of claims 1-3, characterized in that: The mixing chamber (400) is inclined upward.

6. A furnace cooling device according to claim 5, characterized in that: Each mixing chamber (400) is equally spaced on the side of the chamber body (100) surrounding the liquid receiving hopper (300).

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