Waste heat recovery device for sintering flue gas

Abstract

The utility model discloses a sintering flue gas waste heat recovery device which comprises a waste heat recovery tank, an air inlet pipe is installed on the surface of the lower portion of the waste heat recovery tank in a penetrating mode, and a filter box is installed on the surface of the air inlet pipe. According to the sintering flue gas heat exchanger, sintering flue gas enters the lower heat exchange disc through the gas inlet pipe, the sintering flue gas is promoted to enter the multiple heat exchange pipes after being divided in the lower heat exchange disc, and then the sintering flue gas is discharged through the gas outlet pipe after being converged through the upper heat exchange disc; a plurality of second heat conduction fins are arranged on the separated surfaces of the lower heat exchange disc and the upper heat exchange disc in a surrounding manner, so that the heat of the sintering flue gas can be diffused into cold water in the waste heat recovery tank in a heat conduction manner in the process of passing through the lower heat exchange disc, the upper heat exchange disc and a plurality of heat exchange pipes; when the temperature value detected by the temperature sensor reaches the preset value of the controller, the controller opens the electric valve of the water outlet pipe, and hot water heated to the set temperature is discharged.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of flue gas waste heat recovery, specifically, relate to a kind of for sintering flue gas waste heat recovery device. BACKGROUND

[0002] In order to reduce the total amount of sintering flue gas pollutants, sintering flue gas circulation as an important emission reduction scheme has been concerned by the industry. The sintering flue gas circulation process is to recycle part of the sintering flue gas from the wind box branch or the sintering flue gas from the main flue pipe to the upper smoke seal cover of the sintering machine trolley. Under the action of the main exhaust fan, the circulating waste gas participates in sintering again.

[0003] After searching, the patent number CN217979874U discloses a sintering machine flue gas circulation waste heat utilization machine, which relates to the technical field of sintering production. It includes a heat exchange tank, a flue gas flow pipe that penetrates and communicates with the heat exchange tank, a plurality of evenly distributed water inlet pipes connected to the outer periphery of the heat exchange tank at the upper end, a plurality of evenly distributed water outlet pipes connected to the outer periphery of the heat exchange tank at the lower end, a fixing ring connected to the outer periphery of the heat exchange tank, a plurality of evenly distributed adjusting mechanisms connected to the end of the fixing ring away from the water inlet pipes, a filter assembly connected to the end of the flue gas flow pipe away from the fixing ring, a stirring mechanism connected to the heat exchange tank, the stirring mechanism being arranged between the water inlet pipes and the water outlet pipes, the stirring mechanism including a support plate connected to the outer periphery of the heat exchange tank, an electric motor connected to the support plate, and a rotating shaft A connected to the output end of the electric motor. The utility model realizes the action of continuously heating water while filtering flue gas, improving the utilization rate of heat in flue gas.

[0004] However, the above-mentioned flue gas waste heat utilization device only has the effect of continuously heating water, resulting in the final heated hot water temperature being high or low, so that the hot water generated by flue gas waste heat cannot be utilized.

[0005] At present, there is no effective solution to the problems in the related technology. INVENTION CONTENTS

[0006] (I) Technical problems solved

[0007] To solve the above-mentioned problems, the utility model provides a sintering flue gas waste heat recovery device, thereby solving the problems in the above background technology.

[0008] (II) Technical solutions

[0009] To achieve the above-mentioned problems, the utility model adopts the following specific technical solutions:

[0010] A waste heat recovery device for sintering flue gas includes a waste heat recovery tank. An inlet pipe is inserted into the lower surface of the waste heat recovery tank, and a filter box is installed on the surface of the inlet pipe. One end of the inlet pipe is connected to a flue gas inlet pipe via a flange, and the other end of the inlet pipe extends into the waste heat recovery tank and connects to a lower heat exchange plate. An upper heat exchange plate is positioned above the lower heat exchange plate, and a plurality of heat exchange tubes are arranged around the facing surfaces of the upper and lower heat exchange plates. A plurality of second heat-conducting fins are fixed to the separating surfaces of the upper and lower heat exchange plates, and a plurality of first heat-conducting fins are arranged around the surface of each heat exchange tube. The top surface of the upper heat exchange plate is connected to an air outlet pipe, and one end of the air outlet pipe extends to the outside of the waste heat recovery tank. The top surface of the waste heat recovery tank is connected to a water supply pipe, and the bottom surface of the waste heat recovery tank is connected to a water outlet pipe. Electric valves are installed on the surfaces of the water supply pipe and the water outlet pipe. A temperature sensor is installed on the lower inner side of the waste heat recovery tank, and a liquid level sensor is installed on the top inner side of the waste heat recovery tank. A controller is installed on the top surface of the waste heat recovery tank, and the output terminal of the controller is electrically connected to the electric valves of the water supply pipe and the water outlet pipe, respectively. The temperature sensor and the liquid level sensor are electrically connected to the controller, respectively.

[0011] Furthermore, several inclined filter plates are installed in parallel inside the filter box, and an activated carbon filter screen is embedded on the surface of each inclined filter plate. The activated carbon filter screens of two adjacent inclined filter plates are installed in opposite positions. A maintenance port is provided on the side of the filter box, and a maintenance plate that is fixedly connected to the filter box is installed around the maintenance port by screws.

[0012] Furthermore, the bottom of the waste heat recovery tank is welded with several support legs, and each support leg is inclined relative to the waste heat recovery tank.

[0013] Furthermore, the liquid level inside the waste heat recovery tank is higher than the installation height of the upper heat exchange plate.

[0014] Furthermore, the surfaces of the first and second heat-conducting fins are each provided with a plurality of U-shaped notches at equal intervals.

[0015] Furthermore, several heat exchange tubes are arranged around the center of the lower heat exchange plate, and the two ends of the heat exchange tubes are respectively connected to the upper heat exchange plate and the lower heat exchange plate.

[0016] (III) Beneficial Effects

[0017] Compared with the prior art, this utility model provides a waste heat recovery device for sintering flue gas, which has the following beneficial effects:

[0018] (1) In this utility model, the sintering flue gas enters the lower heat exchange plate through the inlet pipe, causing the sintering flue gas to be diverted in the lower heat exchange plate and enter several heat exchange tubes. Then, it is discharged through the outlet pipe after being merged through the upper heat exchange plate. During this process, since several first heat-conducting fins are arranged around the surface of several heat exchange tubes, and several second heat-conducting fins are arranged around the separation surfaces of the lower and upper heat exchange plates, the heat of the sintering flue gas can be diffused into the cold water in the waste heat recovery tank in the form of heat conduction during the process of passing through the lower heat exchange plate, the upper heat exchange plate and several heat exchange tubes. When the temperature value detected by the temperature sensor reaches the preset value of the controller, the controller opens the electric valve of the outlet water pipe to discharge the hot water heated to the set temperature. When the liquid level sensor detects that the water level is lower than the preset value, the controller opens the electric valve of the water supply pipe to inject water. Compared with the prior art, it is easy to continuously provide hot water with a constant water temperature while satisfying the waste heat recovery of flue gas.

[0019] (2) In this utility model, a filter box is installed on the surface of the air inlet pipe. By filling the sintering flue gas into the air inlet pipe, the sintering flue gas is forced to enter the filter box of the air inlet pipe. Since several inclined filter plates are arranged in parallel inside the filter box, and the activated carbon filter screens of two adjacent inclined filter plates are arranged in opposite directions, the sintering flue gas passes through several inclined filter plates in a serpentine manner. Combined with the maintenance plate installed by screws on the side of the filter box, it not only meets the requirements of sintering flue gas filtration, but also facilitates the subsequent cleaning of particulate matter, and avoids the situation where particulate matter adheres to the inner wall of the lower heat exchange plate, the upper heat exchange plate and several heat exchange tubes, causing a decrease in the efficiency of flue gas waste heat recovery. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Fig. 1 This is a schematic diagram of the structure of a waste heat recovery device for sintering flue gas proposed in this utility model;

[0022] Fig. 2 This is a schematic diagram of the internal structure of the filter box of this utility model;

[0023] Fig. 3 This is a cross-sectional view of the waste heat recovery tank of this utility model.

[0024] In the picture:

[0025] 1. Waste heat recovery tank; 2. Lower heat exchange plate; 3. Upper heat exchange plate; 4. Heat exchange tube; 5. Gas outlet pipe; 6. Gas inlet pipe; 7. Flue gas inlet pipe; 8. Filter box; 9. First heat-conducting fin; 10. Second heat-conducting fin; 11. Liquid level sensor; 12. Controller; 13. Temperature sensor; 14. Water supply pipe; 15. Water outlet pipe; 16. Electric valve; 17. Maintenance plate; 18. Support leg; 19. Inclined filter plate; 20. Activated carbon filter screen. Detailed Implementation

[0026] To further illustrate the various embodiments, the present invention provides accompanying drawings, which are part of the disclosure of the present invention. These drawings are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, those skilled in the art should be able to understand other possible implementation methods and the advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are usually used to represent similar components.

[0027] According to an embodiment of the present invention, a device for recovering waste heat from sintering flue gas is provided.

[0028] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments, such as... Figs. 1-3As shown, a waste heat recovery device for sintering flue gas according to an embodiment of the present invention includes a waste heat recovery tank 1. An air inlet pipe 6 is inserted and installed on the lower surface of the waste heat recovery tank 1, and a filter box 8 is installed on the surface of the air inlet pipe 6. One end of the air inlet pipe 6 is connected to a flue gas inlet pipe 7 through a flange, and the other end of the air inlet pipe 6 extends into the waste heat recovery tank 1 and connects to a lower heat exchange plate 2. An upper heat exchange plate 3 is arranged above the lower heat exchange plate 2, and a plurality of heat exchange tubes 4 are arranged around the facing surfaces of the upper heat exchange plate 3 and the lower heat exchange plate 2. A plurality of second heat-conducting fins 10 are fixed on the separating surfaces of the upper heat exchange plate 3 and the lower heat exchange plate 2, and a plurality of first heat-conducting fins 9 are arranged around the surface of the heat exchange tubes 4. An air outlet pipe 5 is connected to the top surface of the upper heat exchange plate 3, and one end of the air outlet pipe 5 extends to the outside of the waste heat recovery tank 1. A water supply pipe 14 is connected to the top surface of the waste heat recovery tank 1. Furthermore, the bottom surface of the waste heat recovery tank 1 is connected to a water outlet pipe 15, and electric valves 16 are installed on the surfaces of both the water supply pipe 14 and the water outlet pipe 15. A temperature sensor 13 is installed on the lower inner side of the waste heat recovery tank 1, and a liquid level sensor 11 is installed on the top inner side of the waste heat recovery tank 1. A controller 12 is installed on the top surface of the waste heat recovery tank 1, and the output terminals of the controller 12 are electrically connected to the electric valves 16 of the water supply pipe 14 and the water outlet pipe 15, respectively. The temperature sensor 13 and the liquid level sensor 11 are electrically connected to the controller 12, respectively. The control method of this utility model is automatic control through the controller 12. The control circuit of the controller 12 can be implemented by simple programming by those skilled in the art. The power supply is also common knowledge in the art. Furthermore, this utility model is mainly used to protect mechanical devices, so the control method and circuit connection will not be explained in detail in this utility model.

[0029] In one embodiment, several inclined filter plates 19 are installed in parallel inside the filter box 8, and an activated carbon filter screen 20 is embedded on the surface of each inclined filter plate 19. The activated carbon filter screens 20 of two adjacent inclined filter plates 19 are installed in opposite positions. A maintenance port is provided on the side of the filter box 8, and a maintenance plate 17 fixedly connected to the filter box 8 is installed around the maintenance port by screws. By filling the sintering flue gas into the flue gas inlet pipe 7, the sintering flue gas is forced to enter the filter box 8 of the inlet pipe 6 through the flue gas inlet pipe 7. Since several inclined filter plates 19 are arranged in parallel inside the filter box 8, and the activated carbon filter screens 20 of two adjacent inclined filter plates 19 are arranged in opposite directions, the sintering flue gas passes through several inclined filter plates 19 in a serpentine direction to filter the particulate matter in the sintering flue gas. Combined with the maintenance plate 17 installed by screws on the side of the filter box 8, the sintering flue gas filtration is satisfied while the subsequent particulate matter is easily cleaned, avoiding the situation where particulate matter adheres to the inner wall of the lower heat exchange plate 2, the upper heat exchange plate 3, and several heat exchange tubes 4, which causes a decrease in the efficiency of flue gas waste heat recovery.

[0030] In one embodiment, a number of support legs 18 are welded around the bottom of the waste heat recovery tank 1, and each support leg 18 is inclined about the waste heat recovery tank 1. The support legs 18 make it easy to provide reliable support for the waste heat recovery tank 1.

[0031] In one embodiment, the liquid level inside the waste heat recovery tank 1 is higher than the installation height of the upper heat exchange plate 3. This allows cold water to submerge the upper heat exchange plate 3, facilitating the efficient recovery of waste heat from sintering flue gas.

[0032] In one embodiment, the surfaces of the first heat-conducting fin 9 and the second heat-conducting fin 10 are provided with a plurality of U-shaped notches at equal intervals. By setting a plurality of U-shaped notches, it is easy to increase the surface area of ​​the first heat-conducting fin 9 and the second heat-conducting fin 10, thereby increasing the heat exchange effect.

[0033] In one embodiment, a plurality of heat exchange tubes 4 are arranged around the center of the lower heat exchange plate 2, and the two ends of the heat exchange tubes 4 are respectively connected to the upper heat exchange plate 3 and the lower heat exchange plate 2. By arranging a plurality of heat exchange tubes 4, it is easy to divert the sintering flue gas of the lower heat exchange plate 2, increase the heat exchange contact area between the sintering flue gas and the cold water in the waste heat recovery tank 1, and improve the heat exchange efficiency.

[0034] Working principle: First, sintering flue gas is introduced into the inlet pipe 7, causing it to enter the filter box 8 of the inlet pipe 6. Since several inclined filter plates 19 are arranged parallel to each other inside the filter box 8, and the activated carbon filter screens 20 of adjacent inclined filter plates 19 are arranged in opposite directions, the sintering flue gas passes through the inclined filter plates 19 in a serpentine manner, filtering out particulate matter. During waste heat recovery, the sintering flue gas enters the lower heat exchange plate 2 through the inlet pipe 6, causing it to be split within the lower heat exchange plate 2 and enter several heat exchange tubes 4. It then converges through the upper heat exchange plate 3 and is discharged through the outlet pipe 5. During this process, several first heat-conducting fins 9 are arranged around the surface of the heat exchange tubes 4, and the lower... Several second heat-conducting fins 10 are respectively arranged around the phase separation surfaces of heat exchange plate 2 and upper heat exchange plate 3, so that the heat of sintering flue gas can be diffused into the cold water in the waste heat recovery tank 1 in the form of heat conduction during the process of passing through lower heat exchange plate 2, upper heat exchange plate 3 and several heat exchange tubes 4. When the temperature value detected by temperature sensor 13 reaches the preset value of controller 12, controller 12 opens the electric valve 16 on the surface of water outlet pipe 15 to discharge hot water heated to the set temperature. When the liquid level sensor 11 detects that the water level is lower than the preset value, controller 12 opens the electric valve 16 of water supply pipe 14 to inject water. While satisfying the waste heat recovery of flue gas, it is easy to continuously provide hot water with a constant water temperature, which is convenient for providing washing water for the production workshop dormitory.

[0035] In this utility model, unless otherwise explicitly specified and limited, the terms "installation", "setting", "connection", "fixing", "screw connection", etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal connection of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0036] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A waste heat recovery device for sintering flue gas, comprising a waste heat recovery tank (1), characterized in that, An air inlet pipe (6) is inserted into the lower surface of the waste heat recovery tank (1), and a filter box (8) is installed on the surface of the air inlet pipe (6). One end of the air inlet pipe (6) is connected to a flue pipe (7) through a flange, and the other end of the air inlet pipe (6) extends into the waste heat recovery tank (1) and is connected to a lower heat exchange plate (2). An upper heat exchange plate (3) is provided above the lower heat exchange plate (2), and several heat exchange tubes (4) are arranged around the facing surfaces of the upper heat exchange plate (3) and the lower heat exchange plate (2). Several second heat-conducting fins (10) are fixed on the separating surfaces of the upper heat exchange plate (3) and the lower heat exchange plate (2). Several first heat-conducting fins (9) are arranged around the surface of the heat exchange tubes (4). An air outlet pipe (5) is connected to the top surface of the upper heat exchange plate (3), and the air outlet... One end of the pipe (5) extends to the outside of the waste heat recovery tank (1). The top surface of the waste heat recovery tank (1) is connected to the water supply pipe (14), and the bottom surface of the waste heat recovery tank (1) is connected to the water outlet pipe (15). Electric valves (16) are installed on the surfaces of the water supply pipe (14) and the water outlet pipe (15). A temperature sensor (13) is installed on the lower inner side of the waste heat recovery tank (1), and a liquid level sensor (11) is installed on the top inner side of the waste heat recovery tank (1). A controller (12) is installed on the top surface of the waste heat recovery tank (1), and the output end of the controller (12) is electrically connected to the electric valves (16) of the water supply pipe (14) and the water outlet pipe (15), respectively. The temperature sensor (13) and the liquid level sensor (11) are electrically connected to the controller (12), respectively.

2. The waste heat recovery device for sintering flue gas according to claim 1, characterized in that, The filter box (8) has several inclined filter plates (19) installed in parallel inside, and each inclined filter plate (19) has an activated carbon filter screen (20) embedded in its surface. The activated carbon filter screens (20) of two adjacent inclined filter plates (19) are installed in opposite positions. The filter box (8) has a maintenance port on its side, and a maintenance plate (17) is fixedly connected to the filter box (8) by screws around the maintenance port.

3. The waste heat recovery device for sintering flue gas according to claim 1, characterized in that, The bottom of the waste heat recovery tank (1) is welded with several support legs (18), and each support leg (18) is inclined about the waste heat recovery tank (1).

4. The waste heat recovery device for sintering flue gas according to claim 1, characterized in that, The liquid level inside the waste heat recovery tank (1) is higher than the installation height of the upper heat exchange plate (3).

5. A waste heat recovery device for sintering flue gas according to claim 1, characterized in that, The surfaces of the first heat-conducting fin (9) and the second heat-conducting fin (10) are each provided with a number of U-shaped notches at equal intervals.

6. A waste heat recovery device for sintering flue gas according to claim 1, characterized in that, Several heat exchange tubes (4) are arranged around the center of the lower heat exchange plate (2), and the two ends of the heat exchange tubes (4) are respectively connected to the upper heat exchange plate (3) and the lower heat exchange plate (2).

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