Oven tail gas waste heat secondary utilization system

Abstract

An oven tail gas waste heat secondary utilization system comprises a tail gas waste heat recovery device and a waste heat secondary utilization device, the tail gas waste heat recovery device comprises a heat exchange water tank, a heat exchange device, a tail gas treatment device and a tail end exhaust fan, and the heat exchange device is arranged in the heat exchange water tank and used for conducting heat exchange with water in the heat exchange water tank; heated water in the heat exchange water tank enters the waste heat secondary utilization device to be secondarily utilized, and water, subjected to heat exchange, of the waste heat secondary utilization device returns to the heat exchange water tank through a return pipe; a gas inlet pipe of the heat exchange device is connected with an oven or heating equipment through an oven tail gas exhaust pipe, and is also connected with a burner through a burner tail gas exhaust pipe; a gas outlet pipe of the heat exchange device is connected with a tail gas treatment device, and tail gas treated by the tail gas treatment device is exhausted outdoors through a tail end exhaust fan. The utility model has the advantage of higher heat utilization rate of the tail gas.

Description

Technical Field

[0001] The utility model relates to the technical field of oven heating, in particular to a secondary utilization system of waste heat from oven tail gas. Background Art

[0002] In the coating equipment industry, drying equipment is a major energy consumer, and the exhaust gas discharged by drying equipment also needs to carry away a lot of heat. Recycling this heat is a key point for customers to reduce equipment usage costs and energy consumption. How to safely and efficiently utilize exhaust heat and how to turn waste into treasure are urgent issues to be solved in this industry. The traditional method of utilizing exhaust heat is to install plate heat exchangers or heat exchange tubes in the exhaust pipe. Although this method can also achieve the purpose of heat exchange, it has the problem of relatively short flue gas heat exchange time and low heat exchange efficiency. Utility Model Content

[0003] The utility model provides a secondary utilization system of waste heat from oven tail gas with higher heat utilization rate.

[0004] The technical solution of the utility model is: to provide a system for secondary utilization of waste heat from exhaust gas of an oven, including a waste heat recovery device for exhaust gas and a waste heat secondary utilization device, the waste heat recovery device for exhaust gas including a water exchange tank, a heat exchange device, an exhaust gas treatment device and a terminal exhaust fan, the heat exchange device is arranged in the water exchange tank, and is used for heat exchange with water in the water exchange tank; the heated water in the water exchange tank enters the waste heat secondary utilization device for secondary utilization, and the water with heat exchanged in the waste heat secondary utilization device is returned to the water exchange tank through a return pipe; the air inlet pipe of the heat exchange device is connected to the oven or heating equipment through the exhaust pipe of the oven, and the air inlet pipe of the heat exchange device is also connected to the burner through the exhaust pipe of the burner; the air outlet pipe of the heat exchange device is connected to the exhaust treatment device, and the exhaust gas treated by the exhaust treatment device is discharged to the outside through the terminal exhaust fan; the burner provides heat energy for the oven or heating equipment.

[0005] As an improvement to the present invention, the heat exchange device includes a front smoke box, a rear smoke box and a heat exchange tube. The heat exchange tube is located between the front smoke box and the rear smoke box and connects the front smoke box and the rear smoke box. The outer end of the front smoke box is connected to the air inlet pipe, and the outer end of the rear smoke box is connected to the air outlet pipe.

[0006] As an improvement to the present invention, the water exchange tank includes an overflow drain pipe, the upper end of the overflow drain pipe is connected to the upper part of the water exchange tank, and the lower end of the overflow drain pipe is connected to the lower part of the water exchange tank.

[0007] As an improvement to the present invention, the burner includes a thermal energy chamber, an oven heat exchanger and a burner. The oven heat exchanger is located in the thermal energy chamber, and the burner is located on the wall of the thermal energy chamber. The heat energy generated by the burner passes through the oven heat exchanger to heat the air in the thermal energy chamber. The heated hot air is input into the oven or heating equipment body through a blower to heat the workpiece; the exhaust gas generated by the oven heat exchanger is output through the exhaust pipe of the burner.

[0008] As an improvement to the present invention, a plurality of tail gas branch pipes are provided on the main body of the oven or heating device, and all tail gas branch pipes are connected to the tail gas pipe of the oven.

[0009] As an improvement to the present invention, the plurality of exhaust branch pipes are evenly distributed.

[0010] As an improvement to the present invention, the waste heat secondary utilization device includes a hot water boiler and a water tank for water use equipment. The heated water in the heat exchange water tank enters the hot water boiler through a heat exchange outlet pipe to be further heated, and then is input into the water tank heat exchanger located in the water tank of the water use equipment through a water supply circulation pump to exchange heat with the water in the water tank of the water use equipment. The return water coming out of the water tank heat exchanger is returned to the heat exchange water tank through a return pipe for recycling.

[0011] As an improvement to the present invention, the water tank of the water equipment includes a first water tank and a second water tank. A first water tank heat exchanger is provided in the first water tank, and the first water tank heat exchanger is used to heat the clean water in the first water tank, and the heated clean water is used for hot cleaning the workpiece; a second water tank heat exchanger is provided in the second water tank, and the second water tank heat exchanger is used to heat the degreasing water in the second water tank, and the heated degreasing water is used for pre-degreasing the workpiece.

[0012] As an improvement to the present invention, the present invention also includes a third water-using equipment water tank, in which a third water-tank internal heat exchanger is provided. The third water-tank internal heat exchanger is used to heat the degreasing water in the third water-using equipment water tank, and the heated degreasing water is used for main degreasing of the workpiece.

[0013] As an improvement to the present invention, the present invention also includes a fourth water-using equipment water tank, in which a fourth water-tank heat exchanger is provided. The fourth water-tank heat exchanger is used to heat the silane liquid in the fourth water-using equipment water tank, and the heated silane liquid is used to coat the workpiece.

[0014] The utility model adopts an exhaust gas waste heat recovery device and a waste heat secondary utilization device, the exhaust gas waste heat recovery device includes a heat exchange water tank, a heat exchange device, an exhaust gas treatment device and a terminal exhaust fan, the heat exchange device is arranged in the heat exchange water tank, and is used to exchange heat with the water in the heat exchange water tank; the heated water in the heat exchange water tank enters the waste heat secondary utilization device for secondary utilization, and the water with heat exchanged in the waste heat secondary utilization device is returned to the heat exchange water tank through a return pipe; the air inlet pipe of the heat exchange device passes through the grill grate The exhaust pipe is connected to the oven or heating equipment, and the air inlet pipe of the heat exchange device is also connected to the burner through the burner exhaust pipe; the exhaust pipe of the heat exchange device is connected to the exhaust gas treatment device, and the exhaust gas treated by the exhaust gas treatment device is discharged to the outside through the terminal exhaust fan; the burner is a structure that provides heat energy for the oven or heating equipment, and the exhaust heat of the exhaust gas is first recovered through the exhaust heat recovery device, and then the recovered exhaust heat is utilized through the waste heat secondary utilization device, so that the purpose of higher heat utilization rate of the exhaust gas can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic block diagram of an embodiment of the present invention.

[0016] Figure 2 yes Figure 1 A schematic top view of a specific example of the embodiment is shown.

[0017] Figure 3 yes Figure 2 Schematic diagram of the main structure.

[0018] Figure 4 yes Figure 2 Schematic diagram of the side structure.

[0019] Figure 5 yes Figure 2 Schematic diagram of the structure of the heat exchange device (including the water exchange water tank).

[0020] Figure 6 yes Figure 5 Schematic diagram of the top view structure.

[0021] Figure 7 yes Figure 5 Schematic diagram of the side structure of the heat exchange device (excluding the water exchange tank).

[0022] Figure 8 yes Figure 1 The embodiment is a schematic diagram of a usage status structure.

[0023] Figure 9 yes Figure 8 Schematic diagram of the heat exchange pipeline structure. DETAILED DESCRIPTION

[0024] In order to better understand the above technical solution, the above technical solution will be described in detail below with reference to the accompanying drawings and specific implementation methods.

[0025] like Figures 1 to 4 As shown, Figures 1 to 4 Disclosed is a system for secondary utilization of waste heat from exhaust gas of an oven, comprising a waste heat recovery device 1 and a waste heat secondary utilization device 2. The waste heat recovery device 1 comprises a heat exchange water tank 11, a heat exchange device 12, a waste gas treatment device 13 and a terminal exhaust fan 14. The heat exchange device 12 is arranged in the heat exchange water tank 11 for performing heat exchange with the water in the heat exchange water tank 11. The heated water in the heat exchange water tank 11 enters the waste heat secondary utilization device 2 for secondary utilization. The water heated in the heat exchange water tank 11 is then passed through the waste heat secondary utilization device 2 for secondary utilization. The heat exchanger 12 is connected to the heat exchanger tank 11 through the return pipe 21. The heat exchanger 12's air inlet pipe 121 is connected to the oven or heating device 15 via the oven exhaust pipe 122. The heat exchanger 12's air inlet pipe 121 is also connected to the burner 16 via the burner exhaust pipe 123. The heat exchanger 12's air outlet pipe 124 is connected to the exhaust gas treatment device 13. Exhaust gas treated by the exhaust gas treatment device 13 is discharged outdoors via the terminal exhaust fan 14. The burner 16 provides heat energy for the oven or heating device 15. This structure improves thermal efficiency.

[0026] Preferably, the burner 16 includes a heat chamber 161, an oven heat exchanger 162, and a burner 163. The oven heat exchanger 162 is located within the heat chamber 161, and the burner 163 is located on the wall of the heat chamber 161. The heat energy generated by the burner 163 passes through the oven heat exchanger 162 to heat the air within the heat chamber 161. The heated air is then fed into the oven or heating device body 151 via a blower 164 to heat the workpiece 17. The exhaust gas generated by the oven heat exchanger 162 is discharged through the burner exhaust pipe 123. This structure of the burner 16 has a higher heat exchange efficiency.

[0027] Preferably, the oven or heating device body 151 is provided with a plurality of exhaust branch pipes 1221, all of which are connected to the oven exhaust pipe 122. These exhaust branch pipes 1221 are evenly distributed. This structure allows for the uniform removal of moist exhaust gas from the oven or heating device body 151. The exhaust gas is then dehumidified and deodorized by the exhaust treatment device 13, and then discharged outdoors through the terminal exhaust fan 14 after meeting emission standards.

[0028] See Figure 5-Figure 7The heat exchange device 12 includes a front smoke box 125, a rear smoke box 126 and a heat exchange pipe 127. The heat exchange pipe 127 is located between the front smoke box 125 and the rear smoke box 126, and connects the front smoke box 125 and the rear smoke box 126. The outer end of the front smoke box 125 is connected to the air inlet pipe 121, and the outer end of the rear smoke box 126 is connected to the air outlet pipe 124.

[0029] Preferably, the water exchange tank 11 includes an overflow drain pipe 111 , the upper end 1111 of the overflow drain pipe 111 is connected to the upper part of the water exchange tank 11 , and the lower end 1112 of the overflow drain pipe 111 is connected to the lower part of the water exchange tank 11 .

[0030] See Figure 8 and Figure 9 As can be seen from the figure, the waste heat secondary utilization device 2 includes a hot water boiler 23 and a water tank 24 for water use. The heated water in the water exchange tank 11 enters the hot water boiler 23 through the heat exchange outlet pipe 22 to be further heated, and then is input into the water tank heat exchanger located in the water tank 24 for water use through the water supply circulation pump 231 to exchange heat with the water in the water tank 24 for water use. The return water from the water tank heat exchanger is returned to the water exchange tank 11 for recycling through the return pipe 21.

[0031] Preferably, the water tank 24 for water use equipment includes a first water tank 241 and a second water tank 242 for water use equipment. A first water tank heat exchanger 2411 is provided in the first water tank 241 for heating the clean water in the first water tank 241, and the heated clean water is used for hot cleaning the workpiece; a second water tank heat exchanger 2421 is provided in the second water tank 242 for heating the degreasing water in the second water tank 242, and the heated degreasing water is used for pre-degreasing the workpiece.

[0032] Preferably, the present invention also includes a third water-using equipment water tank 243, in which a third water-tank heat exchanger 2431 is provided. The third water-tank heat exchanger 2431 is used to heat the degreasing water in the third water-using equipment water tank 243, and the heated degreasing water is used for main degreasing of the workpiece.

[0033] Preferably, the present invention also includes a fourth water-using equipment water tank 244, in which a fourth water-tank heat exchanger 2441 is provided. The fourth water-tank heat exchanger 2441 is used to heat the silane liquid in the fourth water-using equipment water tank 244, and the heated silane liquid is used to coat the workpiece.

[0034] Of course, the number of the 24 water tanks of the water-using equipment in the present invention is not limited and can be increased or decreased according to process requirements.

[0035] Although preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they are aware of the basic inventive concepts. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention. Clearly, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, to the extent such changes and modifications fall within the scope of the claims and their equivalents, the present invention is intended to encompass such changes and modifications.

Claims

1. A system for secondary utilization of waste heat from oven exhaust, characterized in that: The invention comprises an exhaust gas waste heat recovery device (1) and a waste heat secondary utilization device (2), wherein the exhaust gas waste heat recovery device (1) comprises a heat exchange water tank (11), a heat exchange device (12), an exhaust gas treatment device (13) and a terminal exhaust fan (14), wherein the heat exchange device (12) is arranged in the heat exchange water tank (11) and is used to perform heat exchange with water in the heat exchange water tank (11); the heated water in the heat exchange water tank (11) enters the waste heat secondary utilization device (2) for secondary utilization, and the water that has exchanged heat in the waste heat secondary utilization device (2) is returned to the exhaust gas treatment device (13) through a return pipe (21). The heat exchanger is placed in the heat exchange tank (11); the air inlet pipe (121) of the heat exchange device (12) is connected to the oven or heating device (15) through the oven exhaust pipe (122), and the air inlet pipe (121) of the heat exchange device (12) is also connected to the burner (16) through the burner exhaust pipe (123); the air outlet pipe (124) of the heat exchange device (12) is connected to the exhaust gas treatment device (13), and the exhaust gas treated by the exhaust gas treatment device (13) is discharged to the outside through the terminal exhaust fan (14); the burner (16) provides heat energy for the oven or heating device (15).

2. The oven exhaust waste heat secondary utilization system according to claim 1 is characterized in that The heat exchange device (12) includes a front smoke box (125), a rear smoke box (126) and a heat exchange pipe (127). The heat exchange pipe (127) is located between the front smoke box (125) and the rear smoke box (126) and connects the front smoke box (125) and the rear smoke box (126). The outer end of the front smoke box (125) is connected to the air inlet pipe (121), and the outer end of the rear smoke box (126) is connected to the air outlet pipe (124).

3. The oven exhaust waste heat secondary utilization system according to claim 1 or 2, characterized in that The water exchange tank (11) comprises an overflow drain pipe (111), an upper end (1111) of the overflow drain pipe (111) is in communication with an upper portion of the water exchange tank (11), and a lower end (1112) of the overflow drain pipe (111) is in communication with a lower portion of the water exchange tank (11).

4. The oven exhaust waste heat secondary utilization system according to claim 1 or 2, characterized in that : The burner (16) includes a heat energy chamber (161), an oven heat exchanger (162) and a burner (163), wherein the oven heat exchanger (162) is located in the heat energy chamber (161), and the burner (163) is located on the wall of the heat energy chamber (161). The heat energy generated by the burner (163) passes through the oven heat exchanger (162) to heat the air in the heat energy chamber (161), and the heated hot air is input into the oven or the heating device body (151) through the blower (164) to heat the workpiece (17); the exhaust gas generated by the oven heat exchanger (162) is output through the burner exhaust pipe (123).

5. The oven exhaust waste heat secondary utilization system according to claim 4 is characterized in that : A plurality of tail gas branch pipes (1221) are provided on the oven or heating device body (151), and all tail gas branch pipes (1221) are connected to the oven grate tail gas pipe (122).

6. The oven exhaust waste heat secondary utilization system according to claim 5 is characterized in that : Several exhaust branch pipes (1221) are evenly distributed.

7. The oven exhaust waste heat secondary utilization system according to claim 1 or 2, characterized in that The waste heat secondary utilization device (2) includes a hot water boiler (23) and a water tank for water use (24). The heated water in the water exchange tank (11) enters the hot water boiler (23) through a heat exchange outlet pipe (22) to be further heated, and then is input into a water tank heat exchanger located in the water tank (24) for water use through a water supply circulation pump (231) to perform heat exchange with the water in the water tank (24). Return water from the water tank heat exchanger is returned to the water exchange tank (11) through a return pipe (21) for recycling.

8. The oven exhaust waste heat secondary utilization system according to claim 7 is characterized in that The water tank (24) of the water-using equipment comprises a first water tank (241) and a second water tank (242). A first water tank heat exchanger (2411) is provided in the first water tank (241). The first water tank heat exchanger (2411) is used to heat the clean water in the first water tank (241). The heated clean water is used for hot cleaning of workpieces. A second water tank heat exchanger (2421) is provided in the second water tank (242). The second water tank heat exchanger (2421) is used to heat the degreasing water in the second water tank (242). The heated degreasing water is used for pre-degreasing the workpieces.

9. The oven exhaust waste heat secondary utilization system according to claim 8, characterized in that The invention also includes a third water-using equipment water tank (243), wherein a third water-tank internal heat exchanger (2431) is provided in the third water-using equipment water tank (243), and the third water-tank internal heat exchanger (2431) is used to heat the degreasing water in the third water-using equipment water tank (243), and the heated degreasing water is used for main degreasing of the workpiece.

10. The oven exhaust waste heat secondary utilization system according to claim 9, characterized in that : It also includes a fourth water tank (244) of the water equipment, wherein a fourth water tank heat exchanger (2441) is provided in the fourth water tank (244), and the fourth water tank heat exchanger (2441) is used to heat the silane liquid in the fourth water tank (244), and the heated silane liquid is used to coat the workpiece.

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