Shuttle kiln waste heat recycling system

Abstract

The utility model relates to a shuttle kiln waste heat recycling system, and belongs to the technical field of ceramic production equipment.The shuttle kiln waste heat recycling system comprises a shuttle kiln, a smoke exhaust pipeline, a gas-gas heat exchanger and a gas-water heat exchanger, the smoke exhaust pipeline is communicated with the shuttle kiln, the gas-gas heat exchanger and the gas-water heat exchanger are sequentially installed on the smoke exhaust pipeline, and the smoke exhaust pipeline is communicated with the shuttle kiln. The gas-gas heat exchanger is connected with a combustion-supporting gas heating pipeline, and the gas-water heat exchanger is connected with a water heating pipeline. The technical problem that when a shuttle kiln is used for firing products, generated flue gas can be directly discharged into the atmosphere, but a large amount of heat exists in the flue gas, and energy waste is caused when the flue gas is directly discharged into the atmosphere can be solved, and the effect of reducing the possibility of energy waste is achieved.

Description

Technical Field

[0001] The present application relates to the field of ceramic production equipment, and in particular to a shuttle kiln waste heat recovery system. Background Art

[0002] Traditional sanitary ceramic factories usually use shuttle kilns to fire products. The flue gas generated when the shuttle kiln fires the products will be directly discharged into the atmosphere. However, there is a lot of heat in the flue gas, and directly discharging it into the atmosphere will cause energy waste. Utility Model Content

[0003] In order to reduce the possibility of energy waste, the present application provides a shuttle kiln waste heat recovery and utilization system.

[0004] The present application provides a shuttle kiln waste heat recovery system, which adopts the following technical solutions:

[0005] A shuttle kiln waste heat recovery and utilization system comprises a shuttle kiln, a smoke exhaust pipe, an air-to-air heat exchanger and an air-to-water heat exchanger, wherein the smoke exhaust pipe is connected to the shuttle kiln, the air-to-air heat exchanger and the air-to-water heat exchanger are sequentially installed on the smoke exhaust pipe and are connected to the smoke exhaust pipe, the air-to-air heat exchanger is connected to a combustion gas heating pipeline, and the air-to-water heat exchanger is connected to a water heating pipeline.

[0006] By adopting the above technical scheme, the combustion-supporting gas in the combustion-supporting gas heating pipeline is heated by the heat in the gas-to-gas heat exchanger and the flue gas, and the heat in the flue gas is used in other production processes to improve the energy utilization rate. In addition, water is heated by the gas-to-water heat exchanger and the heated water is used in other production processes to improve the energy utilization rate. Since the gas-to-gas heat exchanger and the gas-to-water heat exchanger are installed in series on the smoke exhaust pipe in sequence, the heat can be transferred and recovered in multiple stages, thereby improving the energy utilization rate.

[0007] Optionally, the combustion gas heating pipeline includes a main combustion-supporting air duct, a combustion-supporting cold air duct, a combustion-supporting hot air duct and a combustion-supporting fan. The main combustion-supporting air duct is connected to the shuttle kiln, and the combustion-supporting fan is connected to the main combustion-supporting air duct. The combustion-supporting cold air duct and the combustion-supporting hot air duct are both connected to the air-to-air heat exchanger and are communicated with the main combustion-supporting air duct. A first valve is installed on the main combustion-supporting air duct, and the first valve is set at a position between the combustion-supporting cold air duct and the combustion-supporting hot air duct.

[0008] By adopting the above technical solution, when it is necessary to heat the combustion-supporting air, the combustion-supporting air is extracted through the combustion-supporting fan, and the combustion-supporting air exchanges heat with the high-temperature flue gas in the air-to-air heat exchanger through the combustion-supporting cold air duct, so that the combustion air passes through the combustion-supporting hot air duct into the shuttle kiln, and the heat of the flue gas is used in other processes, thereby improving the utilization rate of energy.

[0009] Optionally, the water heating pipeline includes a circulating water tank and a heat-using device connected in sequence.

[0010] By adopting the above technical solution, the heat in the flue gas is transferred to the water through the air-water heat exchanger, so that the hot water can be used in other processes, thereby reducing the possibility of energy waste.

[0011] Optionally, a first circulating pump group is provided between the circulating water tank and the heat-using equipment, and a second circulating pump group is provided between the air-water heat exchanger and the circulating water tank.

[0012] Optionally, the shuttle kiln waste heat recovery system further includes a smoke exhaust bypass pipe, the smoke exhaust bypass pipe is communicated with the shuttle kiln, the smoke exhaust bypass pipe is connected to a smoke exhaust fan, and the air-water heat exchanger is connected to the smoke exhaust fan.

[0013] Optionally, a first temperature detection module is provided on the smoke exhaust duct, the first temperature detection module is electrically connected to a control module, and the control module is connected to the first circulation pump group and the second circulation pump group.

[0014] By adopting the above technical solution, when the control module receives temperature data sent by the first temperature detection module that belongs to the temperature interval, the control module controls the first circulation pump and the second circulation pump to start, thereby reducing the possibility of reverse cooling of the water temperature.

[0015] Optionally, a float valve is provided at the end of the water supply pipe of the circulating water tank.

[0016] By adopting the above technical solution, when the water level in the circulating water tank is lower than the upper limit, the float valve opens to automatically replenish water, thereby reducing the possibility of insufficient water in the circulating water tank.

[0017] Optionally, the first circulation pump group, the second circulation pump group, the inlet and outlet of the air-to-air heat exchanger, the air-to-water heat exchanger, the water inlet and outlet of the heat-using equipment and the smoke exhaust bypass pipe are all provided with a second valve.

[0018] By adopting the above technical solution, the first valve and the second valve are provided to facilitate maintenance.

[0019] In summary, the present application includes at least one of the following beneficial technical effects:

[0020] 1. By adopting the above technical solution, the combustion-supporting gas in the combustion-supporting gas heating pipeline is heated by the heat in the gas-gas heat exchanger and the flue gas, and the heat in the flue gas is used in other production processes to improve the energy utilization rate. In addition, the water is heated by the gas-water heat exchanger, and the heated water is used in other production processes to improve the energy utilization rate. Since the gas-gas heat exchanger and the gas-water heat exchanger are sequentially installed in series on the exhaust pipe, the heat can be transferred and recovered in multiple stages, thereby improving the energy utilization rate.

[0021] 2. When the control module receives temperature data sent by the first temperature detection module and the temperature data belongs to the temperature interval, the control module controls the first circulation pump and the second circulation pump to start, thereby reducing the possibility of reverse cooling of the water temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of a shuttle kiln waste heat recovery and utilization system in this embodiment.

[0023] Figure 2 It is a structural block diagram reflecting the control module control in the embodiment of the present application.

[0024] Explanation of the accompanying drawings: 1. Shuttle kiln; 2. Smoke exhaust duct; 21. Air-to-air heat exchanger; 22. Air-to-water heat exchanger; 3. Smoke exhaust fan; 4. Smoke exhaust bypass duct; 5. Main combustion-supporting air duct; 51. Combustion-supporting cold air duct; 52. Combustion-supporting hot air duct; 53. Combustion-supporting fan; 54. First valve; 6. Circulating water tank; 61. Heat-using equipment; 611. Direct heat-using equipment; 612. Indirect heat-using equipment; 62. First circulation pump group; 63. Second circulation pump group; 7. First temperature detection module; 71. Control module; 72. Second temperature detection module; 73. Electric control valve. DETAILED DESCRIPTION

[0025] The following is combined with Figure 1-2 This application is described in further detail.

[0026] The present application embodiment discloses a shuttle kiln waste heat recovery and utilization system. Figure 1 and Figure 2 The shuttle kiln waste heat recovery and utilization system includes a shuttle kiln 1, a smoke exhaust pipe 2 and a smoke exhaust fan 3, which are connected in sequence. An air-to-air heat exchanger 21 and an air-to-water heat exchanger 22 are installed on the smoke exhaust pipe 2, which are connected in sequence, and the air-to-air heat exchanger 21 and the air-to-water heat exchanger 22 are both connected to the smoke exhaust pipe 2. The shuttle kiln waste heat recovery and utilization system also includes a smoke exhaust bypass pipe 4, which are connected in sequence.

[0027] The gas-to-gas heat exchanger 21 is connected to a combustion gas heating pipeline, and the gas-to-water heat exchanger 22 is connected to a water heating pipeline, wherein the combustion gas heating pipeline includes a main combustion-supporting air duct 5, a combustion-supporting cold air duct 51, a combustion-supporting hot air duct 52 and a combustion-supporting fan 53, the combustion-supporting fan 53, the main combustion-supporting air duct 5 and the shuttle kiln 1 are connected in sequence, the main combustion-supporting air duct 5, the combustion-supporting cold air duct 51 and the gas-to-gas heat exchanger 21 are connected in sequence, the main combustion-supporting air duct 5, the combustion-supporting hot air duct 52 and the gas-to-gas heat exchanger 21 are connected in sequence, and a first valve 54 is installed on the main combustion-supporting air duct 5, and the first valve 54 is located between the combustion-supporting hot air duct 52 and the combustion-supporting cold air duct 51.

[0028] The water heating pipeline includes a circulating water tank 6 and a heat-using device 61, a first circulating pump group 62 is installed between the circulating water tank 6 and the heat-using device 61, and a second circulating pump group 63 is installed between the air-water heat exchanger 22 and the circulating water tank 6, wherein the heat-using device 61 includes a direct heat-using device 611 and an indirect heat-using device 612.

[0029] There are two ways to connect the hot water pipeline in the circulating water tank 6 to the heat-using equipment 61:

[0030] The first method is to connect the hot water pipeline directly to the inlet of the heat-using equipment 61, and return the heat to the circulating water tank 6 after dissipation, such as mud tank coils, mud pool coils, etc.; the second method is to install a radiator on the heat-using equipment 61 to replace the original heating method. For example, a radiator is installed at the air inlet of the hot blast furnace, and the hot water pipeline is connected to the radiator and the heat is dissipated by the original centrifugal fan of the hot blast furnace before returning to the circulating water tank 6, replacing the original gas combustion to heat the air.

[0031] Among them, second valves are provided at the first circulation pump group 62, the second circulation pump group 63, the inlet and outlet of the gas-gas heat exchanger 21, the gas-water heat exchanger 22, the water inlet and outlet of the heat-using equipment 61 and the smoke exhaust bypass pipe 4. In this embodiment, the combustion-aiding gas heating pipeline is called the gas circuit, the water heating pipeline is called the water circuit, the second valve on the gas circuit is a gate valve, and the second valve on the water circuit is a handle butterfly valve. The first valve 54 and the second valve are provided to facilitate the inspection and maintenance of the pipeline.

[0032] When it is necessary to collect the heat in the flue gas, the first valve 54 and the second valve of the exhaust bypass pipe 4 are closed, and the other second valves are all in the open state. The exhaust fan 3 is started, and the exhaust fan 3 extracts the high-temperature hot air generated by the firing section in the shuttle kiln 1, so that the high-temperature hot air enters the air-to-air heat exchanger 21 and the air-to-water heat exchanger 22 through the exhaust pipe 2, and then enters the exhaust fan 3 after passing through the internal finned tubes of the air-to-air heat exchanger 21 and the air-to-water heat exchanger 22, and is then discharged to the outside. The combustion-supporting fan 53 draws air into the air-to-air heat exchanger 21, and the combustion-supporting air exchanges heat with the extracted hot air in the air-to-air heat exchanger 21, thereby raising the temperature of the combustion-supporting air; the water in the circulating water tank 6 is heated in the air-to-liquid heat exchanger and supplied to the heat-using equipment 61 under the action of the first circulating pump group 62 and the second circulating pump group 63. By connecting the air-to-air heat exchanger 21 and the air-to-water heat exchanger 22 in sequence, i.e. in series, the heat in the flue gas can be transferred and recovered in multiple stages, thereby improving the utilization rate of resources.

[0033] A first temperature detection module 7 is provided on the smoke exhaust duct 2. The first temperature detection module 7 is electrically connected to a control module 71. The control module 71 is connected to the first circulation pump group 62 and the second circulation pump group 63. The first temperature detection module 7 detects the temperature data in the smoke exhaust duct 2 and sends the temperature data to the control module 71. When the control module 71 receives the temperature data, it compares the temperature data with the temperature range. The temperature range is preset in the control module 71. When the temperature data threshold belongs to the temperature range, the control module 71 controls the first circulation pump group 62 and the second circulation pump group 63 to start, thereby reducing the possibility of reverse cooling of the water temperature in the circulating water tank 6. In this embodiment, the temperature range is 100°C-450°C.

[0034] A float valve is provided at the end of the water supply pipe of the circulating water tank 6. When the water level in the circulating water tank 6 is lower than the upper limit, the float valve opens to automatically supply water. The supplemented water is soft water to prevent scaling on the inner wall of the pipe.

[0035] Among them, a second temperature detection module 72 can also be installed in the heat-using device 61, and the second temperature detection module 72 is electrically connected to the control module 71. An electric-controlled valve 73 is installed at the inlet and outlet of the heat-using device 61, and the electric-controlled valve 73 is electrically connected to the control module 71. Upper and lower limits are set in the control module 71. When the temperature data received by the control module 71 from the second temperature detection module 72 reaches the set upper and lower limits, the control module 71 controls the opening and closing of the electric-controlled valve 73, so that the temperature in the heat-using device 61 fluctuates within the set range.

[0036] In this embodiment, the gas-gas heat exchanger 21 is made of stainless steel, and the internal fin tube base tube is made of stainless steel, so as to reduce the rust generated in the box and sprayed onto the product with the wind, causing burning.

[0037] The possibility of rust on the finished product is reduced. The use of copper fins can increase the heat exchange area and thermal conductivity. All gas and water channels are wrapped with thermal insulation cotton, and the outside of the circulating water tank 6 is wrapped with an insulation board to prevent burns and heat loss. The gas-to-gas heat exchanger 21 increases the temperature of the combustion-supporting air from the initial ambient temperature of 20-50°C to above 160°C before it enters the burner, saving the heat originally used to heat this part of the combustion-supporting air and saving gas consumption. A guide plate is installed in the gas-to-gas heat exchanger 21 to make the wind more evenly dispersed over the entire heat exchange surface.

[0038] The implementation principle of a shuttle kiln waste heat recovery system in the present application embodiment is as follows:

[0039] When it is necessary to collect the heat in the flue gas, the first valve 54 and the second valve of the smoke exhaust bypass duct 4 are closed, and the other second valves are all in the open state. The smoke exhaust fan 3 is started, and the smoke exhaust fan 3 extracts the high-temperature hot air generated in the firing section of the shuttle kiln 1, so that the high-temperature hot air enters the air-to-air heat exchanger 21 and the air-to-water heat exchanger 22, passes through the internal fin tubes of the air-to-air heat exchanger 21 and the air-to-water heat exchanger 22, and then enters the smoke exhaust fan 3, and is then discharged to the outside.

[0040] The combustion-supporting fan 53 draws air into the air-to-air heat exchanger 21, and after circulating outside the finned tubes, enters the burners on both sides of the shuttle kiln 1 for use as combustion-supporting air. The combustion-supporting air exchanges heat with the extracted hot air in the air-to-air heat exchanger 21, thereby raising the temperature of the combustion-supporting air. The water in the circulating water tank 6 is heated in the heat exchanger by multiple circulating water pump groups and then supplied to the heat-using equipment 61, replacing the original heating method.

[0041] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A shuttle kiln waste heat recovery system, characterized in that: The invention comprises a shuttle kiln (1), a smoke exhaust pipe (2), an air-to-air heat exchanger (21) and an air-to-water heat exchanger (22); the smoke exhaust pipe (2) is connected to the shuttle kiln (1); the air-to-air heat exchanger (21) and the air-to-water heat exchanger (22) are sequentially mounted on the smoke exhaust pipe (2) and are connected to the smoke exhaust pipe (2); the air-to-air heat exchanger (21) is connected to a combustion gas heating pipeline; and the air-to-water heat exchanger (22) is connected to a water heating pipeline.

2. The shuttle kiln waste heat recovery system according to claim 1, characterized in that: The combustion-supporting gas heating pipeline comprises a main combustion-supporting air duct (5), a combustion-supporting cold air duct (51), a combustion-supporting hot air duct (52) and a combustion-supporting fan (53); the main combustion-supporting air duct (5) is connected to the shuttle kiln (1); the combustion-supporting fan (53) is connected to the main combustion-supporting air duct (5); the combustion-supporting cold air duct (51) and the combustion-supporting hot air duct (52) are both connected to the air-to-air heat exchanger (21) and are connected to the main combustion-supporting air duct (5); a first valve (54) is installed on the main combustion-supporting air duct (5); the first valve (54) is arranged at a position between the combustion-supporting cold air duct (51) and the combustion-supporting hot air duct (52).

3. The shuttle kiln waste heat recovery system according to claim 2, characterized in that: The water heating pipeline comprises a circulating water tank (6) and a heat-using device (61) which are connected in sequence.

4. The shuttle kiln waste heat recovery system according to claim 3 is characterized in that: A first circulating pump group (62) is arranged between the circulating water tank (6) and the heat-using equipment (61), and a second circulating pump group (63) is arranged between the air-water heat exchanger (22) and the circulating water tank (6).

5. The shuttle kiln waste heat recovery system according to claim 4, characterized in that: The shuttle kiln (1) waste heat recovery system further comprises a smoke exhaust bypass pipe (4), the smoke exhaust bypass pipe (4) is in communication with the shuttle kiln (1), the smoke exhaust bypass pipe (4) is connected to a smoke exhaust fan (3), and the air-water heat exchanger (22) is connected to the smoke exhaust fan (3).

6. The shuttle kiln waste heat recovery system according to claim 4, characterized in that: The smoke exhaust pipe (2) is provided with a first temperature detection module (7), the first temperature detection module (7) is electrically connected to a control module (71), and the control module (71) is connected to the first circulation pump group (62) and the second circulation pump group (63).

7. The shuttle kiln (1) waste heat recovery system according to claim 3, characterized in that: A float valve is provided at the end of the water supply pipe of the circulating water tank (6).

8. The shuttle kiln waste heat recovery system according to claim 5, characterized in that: The first circulation pump group (62), the second circulation pump group (63), the inlet and outlet of the gas-gas heat exchanger (21), the gas-water heat exchanger (22), the water inlet and outlet of the heat-using equipment (61) and the smoke exhaust bypass pipe (4) are all provided with a second valve.

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