Waste heat utilization equipment for pellet circular cooler

Abstract

The utility model discloses waste heat utilization equipment for a pellet circular cooler, which comprises heat exchange equipment, a flue gas inlet, a flue gas outlet, a coal gas inlet and a coal gas outlet are respectively arranged on the heat exchange equipment, the flue gas outlet is communicated with a dust falling tank through a first exhaust pipe, a filtering mechanism is arranged in the dust falling tank, and the coal gas inlet is communicated with the dust falling tank through a second exhaust pipe. An exhaust mechanism is arranged at the upper end of the dust falling tank, and a discharging mechanism is arranged below the dust falling tank; the cold water tank is communicated with the dust falling tank through a second exhaust pipe on the upper side of the filtering mechanism, and one side of the cold water tank is communicated with the exhaust mechanism through a third exhaust pipe. According to the waste heat utilization equipment for the pellet circular cooler, under the cooperation of all the components, the flue gas utilization rate is increased as much as possible, and heat waste is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of waste heat recovery and utilization, in particular to waste heat utilization equipment for a pelletizing ring cooler. Background Art

[0002] Most of the flue gas emissions from the rotary kiln ring cooler in the pelletizing workshop of the steel plant are directly discharged into the atmosphere through pipelines. The discharged flue gas contains a high amount of heat, and direct emission is too wasteful. Some blast furnace gas and converter gas are sent to the rotary kiln for combustion. The low-temperature gas can improve the combustion efficiency and reduce gas consumption after preheating. In order to reuse the flue gas for the second time and preheat the low-temperature gas, most of the current methods use heat exchangers to exchange heat for the flue gas and heat the low-temperature gas at the same time. This heat exchange method still has a low utilization rate of the flue gas. For this reason, the present application proposes a waste heat utilization device that can improve the utilization rate of the flue gas. Utility Model Content

[0003] In view of the deficiencies of the prior art, the utility model provides a waste heat utilization device for a pelletizing ring cooler to improve the heat utilization rate of flue gas.

[0004] To achieve the above purpose, the utility model is implemented through the following technical solutions: a waste heat utilization device for a pelletizing ring cooler, comprising a heat exchange device, wherein a flue gas inlet, a flue gas outlet, a coal gas inlet and a coal gas outlet are respectively provided on the heat exchange device, wherein the flue gas outlet is connected to a dust suppression tank through a first exhaust pipe, a filtering mechanism is provided in the dust suppression tank, an exhaust mechanism is provided at the upper end of the dust suppression tank, and a discharge mechanism is provided at the lower side thereof;

[0005] A cold water tank is connected to the dust suppression tank through a second exhaust pipe on the upper side of the filter mechanism, and one side of the cold water tank is connected to the exhaust mechanism through a third exhaust pipe. The ends of the second exhaust pipe and the third exhaust pipe closer to the cold water tank extend into the cold water tank and are connected through finned tubes.

[0006] Preferably, the filtering mechanism includes a ring fixed in the dust suppression tank, an annular filter screen is provided on the inner side of the ring, a circular block coaxial with the ring is provided on the inner side of the filter screen, a vertically arranged connecting rod is hinged on the circular block, the connecting rod is connected to a cam via a rotating shaft, the cam is coaxially connected to a transmission column, one end of the transmission column passes through the outside of the dust suppression tank and is connected to a motor.

[0007] Preferably, the exhaust mechanism comprises a fourth exhaust pipe provided with a valve, and the connection point between the fourth exhaust pipe and the third exhaust pipe is higher than the valve.

[0008] Preferably, the discharge mechanism includes a discharge pipe connected to the dust suppression tank.

[0009] Preferably, the dust reduction tank is provided with a sealing door higher than the filtering mechanism.

[0010] Preferably, the dust suppression tank is provided with a temperature sensor which is higher than the filtering mechanism.

[0011] Preferably, the smoke inlet and the smoke outlet are horizontally inlet and outlet, and the gas inlet and the gas outlet are top-inlet and top-outlet.

[0012] The utility model provides a waste heat utilization device for a pelletizing ring cooler, which has the following beneficial effects:

[0013] The waste heat utilization equipment used in the pelletizing ring cooler can detect the temperature of the flue gas after the heat exchange through the setting of the temperature detector after the heat exchange of the low-temperature coal gas. If the temperature is high after the heat exchange, close the valve and open the one-way valve, and the flue gas can enter the cold water tank through the second exhaust pipe, and exchange heat with the cold water through the finned tubes. The flue gas after the heat exchange is discharged into the exhaust mechanism through the third exhaust pipe. If the temperature is normal or low after the heat exchange, close the one-way valve and open the valve to discharge the flue gas from the exhaust mechanism. When using it, the utilization rate of the flue gas can be increased as much as possible to reduce heat waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the structure of the utility model;

[0015] Figure 2 This is a schematic diagram of the cross-sectional structure of the dust suppression tank of the utility model;

[0016] Figure 3 For this utility model Figure 2 Enlarged structural diagram at A in the middle.

[0017] In the figure: 1. heat exchange equipment; 2. flue gas inlet; 3. flue gas outlet; 4. gas inlet; 5. gas outlet; 6. first exhaust pipe; 7. dust suppression tank; 8. second exhaust pipe; 9. cold water tank; 10. third exhaust pipe; 11. finned tube; 12. ring; 13. filter; 14. round block; 15. connecting rod; 16. rotating shaft; 17. cam; 18. transmission column; 19. motor; 20. valve; 21. fourth exhaust pipe; 22. discharge pipe; 23. sealing door; 24. temperature sensor. DETAILED DESCRIPTION

[0018] The present invention will be further described below in conjunction with specific embodiments. Figures 1 to 3 As shown:

[0019] Embodiment 1: A waste heat utilization device for a pelletizing ring cooler, comprising a heat exchange device 1, the heat exchange device 1 adopts a plate heat exchanger, and the heat exchange device 1 is respectively provided with a flue gas inlet 2, a flue gas outlet 3, a coal gas inlet 4 and a coal gas outlet 5. The flue gas of the ring cooler is connected with the flue gas inlet 2 through a pipeline, so that the flue gas is discharged into the heat exchange device 1. The low-temperature coal gas is connected with the coal gas inlet 4 through a pipeline, so that the coal gas is sent into the heat exchange device 1 for heat exchange with the flue gas. The coal gas outlet 5 is sent into the rotary kiln through a pipeline;

[0020] The smoke outlet 3 is connected to the dust suppression tank 7 through the first exhaust pipe 6. A filtering mechanism is provided in the dust suppression tank 7. After the smoke enters the dust suppression tank 7, the filtering mechanism can filter the dust in the smoke at the lower side of the filtering mechanism, and the smoke rises to the upper side of the filtering mechanism. An exhaust mechanism is provided at the upper end of the dust suppression tank 7, and a discharge mechanism is provided at the lower side thereof. The filtered dust is discharged from the dust suppression tank 7 through the discharge mechanism.

[0021] A cold water tank 9 is connected to the dust suppression tank 7 through a second exhaust pipe 8 on the upper side of the filter mechanism, a one-way valve is provided on the second exhaust pipe 8, one side of the cold water tank 9 is connected to the exhaust mechanism through a third exhaust pipe 10, and the ends of the second exhaust pipe 8 and the third exhaust pipe 10 closer to the cold water tank 9 are extended into the cold water tank 9 and connected through a finned tube 11;

[0022] Through the arrangement of the finned tube 11, after the flue gas enters the cold water tank 9 through the second exhaust pipe 8, it can exchange heat with the cold water in the cold water tank 9, so as to maximize the use of the waste heat of the flue gas. After the heat exchange, the flue gas enters the exhaust mechanism through the third exhaust pipe 10 and is discharged.

[0023] The cold water tank 9 is provided with a water inlet and a water outlet.

[0024] Embodiment 2: A waste heat utilization device for a pelletizing ring cooler, comprising a heat exchange device 1, wherein the heat exchange device 1 adopts a plate heat exchanger, and is respectively provided with a flue gas inlet 2, a flue gas outlet 3, a coal gas inlet 4 and a coal gas outlet 5, wherein the flue gas inlet 2 and the flue gas outlet 3 are horizontally inlet and outlet, and the coal gas inlet 4 and the coal gas outlet 5 are top-inlet and top-outlet, and the flue gas of the ring cooler is connected with the flue gas inlet 2 through a pipeline, so that the flue gas is conveniently discharged into the heat exchange device 1, and the low-temperature coal gas is connected with the coal gas inlet 4 through a pipeline, so that the coal gas is conveniently sent into the heat exchange device 1 for heat exchange with the flue gas, and the coal gas outlet 5 is sent into the rotary kiln through a pipeline;

[0025] The smoke outlet 3 is connected to a dust suppression tank 7 through a first exhaust pipe 6, and a filtering mechanism is provided in the dust suppression tank 7;

[0026] The filtering mechanism includes a ring 12 fixed in the dust suppression tank 7, the side of the ring 12 is arranged in contact with the inner wall of the dust suppression tank 7, an annular filter screen 13 is arranged on the inner side of the ring 12, a circular block 14 coaxial with the ring 12 is arranged on the inner side of the filter screen 13, a vertically arranged connecting rod 15 is hinged on the circular block 14, the connecting rod 15 is connected to a cam 17 through a rotating shaft 16, the cam 17 is coaxially connected to a transmission column 18, one end of the transmission column 18 passes through the outer side of the dust suppression tank 7 and is connected to a motor 19, the motor 19 drives the cam 17 to rotate through the transmission column 18, and can drive the connecting rod 15 to move up and down, thereby pulling the filter screen 13 to oscillate up and down, so as to shake off the dust stuck under the filter screen 13;

[0027] After the flue gas enters the dust suppression tank 7, the filtering mechanism can filter the dust in the flue gas at the lower side of the filtering mechanism, and the flue gas rises to the upper side of the filtering mechanism. An exhaust mechanism is provided at the upper end of the dust suppression tank 7. The exhaust mechanism includes a fourth exhaust pipe 21 provided with a valve 20. The connection point between the fourth exhaust pipe 21 and the third exhaust pipe 10 is higher than the valve 20. A discharge mechanism is provided at the lower side thereof. The discharge mechanism includes a discharge pipe 22 connected to the dust suppression tank 7. A valve is provided on the discharge pipe 22. The filtered dust is discharged from the dust suppression tank 7 through the discharge mechanism.

[0028] A cold water tank 9 is connected to the dust suppression tank 7 through a second exhaust pipe 8 on the upper side of the filter mechanism, a one-way valve is provided on the second exhaust pipe 8, one side of the cold water tank 9 is connected to the exhaust mechanism through a third exhaust pipe 10, and the ends of the second exhaust pipe 8 and the third exhaust pipe 10 closer to the cold water tank 9 are extended into the cold water tank 9 and connected through a finned tube 11;

[0029] Through the arrangement of the finned tube 11, after the flue gas enters the cold water tank 9 through the second exhaust pipe 8, it can exchange heat with the cold water in the cold water tank 9, so as to maximize the use of the waste heat of the flue gas. After the heat exchange, the flue gas enters the exhaust mechanism through the third exhaust pipe 10 and is discharged.

[0030] The dust suppression tank 7 is provided with a sealing door 23 which is higher than the filtering mechanism, so as to facilitate the cleaning of the interior of the dust suppression tank 7;

[0031] The dust suppression tank 7 is provided with a temperature sensor 24 higher than the filtering mechanism, so as to facilitate the detection of the smoke temperature in the dust suppression tank 7;

[0032] The cold water tank 9 is provided with a water inlet and a water outlet.

[0033] Working principle:

[0034] 1. The flue gas is discharged into the heat exchange device 1 through the flue gas inlet 2, and the low-temperature coal gas is discharged into the heat exchange device 1 through the coal gas inlet 4, so that the flue gas and the coal gas are heat exchanged. The coal gas after heat exchange enters the rotary kiln for full combustion, and the flue gas after heat exchange enters the dust suppression tank 7 through the first exhaust pipe 6. Through the setting of the filtering mechanism, the dust in the flue gas can be filtered on the lower side of the filtering mechanism, and the flue gas can rise to the upper side of the filtering mechanism. Through the setting of the temperature sensor 24, the temperature of the flue gas can be detected. If the flue gas temperature is high, the valve 20 is closed, and the one-way valve on the second exhaust pipe 8 is opened, so that the flue gas enters the finned tube 11 to exchange heat with cold water. After heat exchange, the flue gas enters the fourth exhaust pipe 21 through the third exhaust pipe 10 and is discharged;

[0035] 2. If the smoke temperature is not high, close the one-way valve on the second exhaust pipe 8 and directly open the valve 20 to discharge the smoke from the exhaust mechanism;

[0036] 3. After the waste heat utilization is completed, when cleaning the dust suppression tank 7, open the sealing door 23 and use a water pipe to flush it.

[0037] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A waste heat utilization device for a pelletizing ring cooler, comprising a heat exchange device (1), characterized in that: The heat exchange device (1) is respectively provided with a flue gas inlet (2), a flue gas outlet (3), a coal gas inlet (4) and a coal gas outlet (5), wherein the flue gas outlet (3) is connected to a dust suppression tank (7) via a first exhaust pipe (6), a filtering mechanism is provided in the dust suppression tank (7), an exhaust mechanism is provided at the upper end of the dust suppression tank (7), and a discharge mechanism is provided at the lower side thereof; A cold water tank (9) is connected to the dust suppression tank (7) via a second exhaust pipe (8) on the upper side of the filter mechanism, and one side of the cold water tank (9) is connected to the exhaust mechanism via a third exhaust pipe (10). The ends of the second exhaust pipe (8) and the third exhaust pipe (10) closer to the cold water tank (9) both extend into the cold water tank (9) and are connected via a finned tube (11).

2. The waste heat utilization equipment for pelletizing ring cooler according to claim 1 is characterized in that: The filtering mechanism comprises a circular ring (12) fixed in the dust suppression tank (7); an annular filter screen (13) is provided on the inner side of the circular ring (12); a circular block (14) coaxial with the circular ring (12) is provided on the inner side of the filter screen (13); a vertically arranged connecting rod (15) is hingedly connected to the circular block (14); the connecting rod (15) is connected to a cam (17) via a rotating shaft (16); the cam (17) is coaxially connected to a transmission column (18); one end of the transmission column (18) passes through the outer side of the dust suppression tank (7) and is connected to a motor (19).

3. The waste heat utilization equipment for pelletizing ring cooler according to claim 1 is characterized in that: The exhaust mechanism comprises a fourth exhaust pipe (21) provided with a valve (20), and the connection point between the fourth exhaust pipe (21) and the third exhaust pipe (10) is higher than the valve (20).

4. The waste heat utilization equipment for pelletizing ring cooler according to claim 1, characterized in that: The discharge mechanism comprises a discharge pipe (22) connected to the dust suppression tank (7).

5. The waste heat utilization equipment for pelletizing ring cooler according to claim 1 is characterized in that: The dust suppression tank (7) is provided with a sealing door (23) which is higher than the filtering mechanism.

6. The waste heat utilization equipment for pelletizing ring cooler according to claim 1, characterized in that: The dust suppression tank (7) is provided with a temperature sensor (24) which is higher than the filtering mechanism.

7. The waste heat utilization equipment for pelletizing ring cooler according to claim 1, characterized in that: The smoke inlet (2) and the smoke outlet (3) are arranged horizontally, and the coal gas inlet (4) and the coal gas outlet (5) are arranged upwardly.

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