Rotary kiln tail gas heat energy recovery device

Abstract

The utility model relates to a rotary kiln tail gas heat energy recovery device, which relates to the technical field of rotary kilns, and comprises a box body, a mounting pipe arranged in the box body, a spiral blade arranged on the mounting pipe, a spiral water pipe arranged in the box body, and an air inlet pipe and an air outlet pipe which are communicated with the box body, one end, far away from the mounting pipe, of the spiral blade is connected with the box body, the spiral blade enables a spiral gas flow channel to be formed in the box body, the spiral water pipe is arranged in the spiral gas flow channel, one end of the spiral water pipe is a water inlet, and the other end of the spiral water pipe is a water outlet. The device has the effects that the retention time of tail gas in the box body is prolonged, so that the heat exchange efficiency of the tail gas and water is improved, and the heat energy utilization rate of the tail gas is improved.

Description

Technical Field

[0001] The present application relates to the field of rotary kiln technology, and in particular to a rotary kiln tail gas heat energy recovery device. Background Art

[0002] The tail gas of the rotary kiln is high-temperature exhaust gas, which contains a large amount of heat energy. In order to reduce energy waste and improve energy utilization, a rotary kiln tail gas heat recovery device is usually used to recycle the energy contained in the high-temperature exhaust gas.

[0003] Prior art CN213300879U discloses a rotary kiln waste heat utilization structure, which includes a housing, a mounting plate threadedly mounted on the top of the housing, an air inlet pipe extending through the top of the mounting plate and connecting to the housing's inner cavity, an air inlet valve disposed on the outside of the air inlet pipe, an air outlet pipe disposed at the bottom of the housing, two sets of side housings symmetrically disposed on either side of the housing's inner cavity, a water tank disposed at the bottom of the side housing's inner cavity, a circulating pump mounted on the top of the side housing's inner cavity, a mounting frame fixedly mounted on the outside of the side housing's inner cavity, and a water outlet pipe extending through the housing's outer side. The above structure improves heat recovery efficiency through the use of a circular circulating water pipe in conjunction with a heat conducting plate on the outside of the water pipe. Furthermore, the vacuum layer and insulation layer on the inner and outer walls of the housing provide excellent thermal insulation, effectively preventing heat loss and maximizing waste heat recovery. Since the rotary kiln continuously generates exhaust gas, the exhaust gas's residence time in the housing is short, resulting in a low heat exchange efficiency between the exhaust gas and the water in the circulating water pipe, which in turn reduces the thermal energy utilization rate of the exhaust gas.

[0004] With respect to the above-mentioned related technologies, the inventors believe that the residence time of the tail gas in the rotary kiln waste heat utilization structure is short, resulting in low heat exchange efficiency between the tail gas and water, thereby reducing the thermal energy utilization rate of the tail gas. Utility Model Content

[0005] In order to solve the above technical problems, the present application provides a rotary kiln tail gas heat energy recovery device.

[0006] This application provides a rotary kiln tail gas heat recovery device, which adopts the following technical solutions:

[0007] A rotary kiln tail gas heat energy recovery device comprises a housing, a mounting pipe arranged in the housing, a spiral blade arranged on the mounting pipe, a spiral water pipe arranged in the housing, and an air inlet pipe and an air outlet pipe connected to the housing; the spiral blade is connected to the housing at one end away from the mounting pipe, the spiral blade forms a spiral gas flow channel in the housing, the spiral water pipe is arranged in the spiral gas flow channel, one end of the spiral water pipe is a water inlet, and the other end is a water outlet.

[0008] By adopting this technical solution, exhaust gas enters the box through the air inlet pipe and flows through the spiral gas flow channel, exchanging heat with the water in the spiral water pipe. The spiral blades increase the residence time of the exhaust gas in the box, thereby improving the heat exchange efficiency between the exhaust gas and the water, and thus improving the thermal energy utilization rate of the exhaust gas.

[0009] Preferably, the air inlet pipe is arranged at an end of the box body away from the water inlet, the air outlet pipe is arranged at an end of the box body close to the water inlet, and the water inlet is arranged at an end of the box body close to the ground.

[0010] By adopting the above technical solution, the heat exchange efficiency between the exhaust gas and water is improved by convective heat transfer, and the speed of heat transfer between the exhaust gas and water is increased, thereby improving the thermal energy utilization rate of the exhaust gas.

[0011] Preferably, a plurality of heat-conducting rings are fixedly provided on the spiral water pipe.

[0012] By adopting the above technical solution, the provision of the heat-conducting ring increases the heat exchange area between the spiral water pipe and the exhaust gas, thereby further improving the heat exchange efficiency between the exhaust gas and water, and further improving the thermal energy utilization rate of the exhaust gas.

[0013] Preferably, a reinforcement plate is provided on the spiral water pipe, and one end of the reinforcement plate away from the spiral water pipe is connected to the box.

[0014] By adopting the above technical solution, the provision of the reinforcement plate increases the stability of the spiral water pipe, thereby improving the stability of the heat exchange between the water in the spiral water pipe and the exhaust gas.

[0015] Preferably, a spoiler is provided in the box body, the spoiler is connected to the spiral blade, one side of the spoiler is connected to the outer wall of the mounting tube, and the other side is connected to the inner wall of the box body, and ventilation holes are opened on the spoiler.

[0016] By adopting the above technical solution, the setting of the baffle increases the resistance encountered by the exhaust gas when flowing in the spiral gas flow channel, thereby increasing the time the exhaust gas stays in the box, and further improving the efficiency of heat exchange between the exhaust gas and water.

[0017] Preferably, a connecting hole is provided on the baffle, and the spiral water pipe passes through the connecting hole and is connected to the baffle.

[0018] By adopting the above technical solution, the baffle is connected to the spiral water pipe, so that the baffle transfers the heat it absorbs to the water in the spiral water pipe, further increasing the heat exchange area between the exhaust gas and the water, thereby further improving the heat exchange efficiency between the exhaust gas and the water.

[0019] Preferably, the baffle is made of copper or aluminum.

[0020] By adopting the above technical solution, the baffle made of copper or aluminum has a good thermal conductivity, thereby further improving the heat exchange efficiency between the exhaust gas and water.

[0021] Preferably, a filter assembly is provided in the air inlet pipe.

[0022] By adopting the above technical solution, the filter component filters the exhaust gas entering the box, reducing the adhesion of dust and other impurities in the exhaust gas to the outer wall of the spiral water pipe, thereby reducing the heat exchange efficiency between the exhaust gas and water.

[0023] Preferably, the filter assembly includes a first filter screen, a second filter screen, and a filter element disposed between the first filter screen and the second filter screen in the air inlet duct.

[0024] By adopting the above technical solution, the first filter screen and the second filter screen support and fix the filter element, and effectively remove dust and other impurities in the exhaust gas through three-layer filtration, thereby achieving a higher heat exchange efficiency between the exhaust gas and water.

[0025] In summary, this application has the following beneficial technical effects:

[0026] 1. The spiral gas flow channel set in the box increases the residence time of the exhaust gas in the box, and the flow direction of the exhaust gas and water is opposite, thereby improving the heat exchange efficiency between the exhaust gas and water, and further improving the thermal energy utilization rate of the exhaust gas;

[0027] 2. The heat conduction ring installed on the spiral water pipe increases the heat conduction area, thereby further improving the heat exchange efficiency between the exhaust gas and water, and thus improving the thermal energy utilization rate of the exhaust gas;

[0028] 3. The setting of the baffle further increases the residence time of the exhaust gas in the box, and the baffle is made of copper or aluminum with good thermal conductivity, thereby further improving the heat exchange efficiency between the exhaust gas and water, and further improving the thermal energy utilization rate of the exhaust gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a structural diagram of a rotary kiln tail gas heat recovery device;

[0030] Figure 2 It is a schematic cross-sectional structure diagram of a rotary kiln tail gas heat recovery device;

[0031] Figure 3 It is a schematic diagram of the cross-sectional structure of the air inlet pipe and the filter assembly;

[0032] Figure 4It is a structural diagram of the spiral water pipe, heat conduction ring and reinforcement plate.

[0033] Explanation of the accompanying drawings: 1. Box body; 11. Air inlet pipe; 12. Air outlet pipe; 13. Spiral gas flow channel; 2. Mounting pipe; 3. Spiral blade; 4. Spiral water pipe; 41. Water inlet; 42. Water outlet; 43. Heat transfer ring; 44. Reinforcement plate; 5. Filter assembly; 51. First filter screen; 52. Second filter screen; 53. Filter element; 6. Baffle; 61. Ventilation hole; 62. Connecting hole. DETAILED DESCRIPTION

[0034] The following is combined with Figure 1-4 This application is described in further detail.

[0035] The embodiment of the present application discloses a rotary kiln tail gas heat energy recovery device.

[0036] Reference Figure 1 、 Figure 2 and Figure 3 A rotary kiln exhaust heat recovery device includes a housing 1, a mounting tube 2 fixedly mounted in the housing 1, a spiral blade 3 fixedly mounted on the mounting tube 2, a spiral water pipe 4 disposed in the housing 1, and an air inlet pipe 11 and an air outlet pipe 12 fixedly connected to the housing 1. The spiral blade 3 is fixedly connected to the housing 1 at one end away from the mounting tube 2. The spiral blade 3 forms a spiral gas flow channel 13 in the housing 1. The spiral water pipe 4 is disposed in the spiral gas flow channel 13. One end of the spiral water pipe 4 is a water inlet 41, and the other end is a water outlet 42.

[0037] The air inlet pipe 11 is fixedly arranged at the end of the housing 1 away from the water inlet 41, the air outlet pipe 12 is fixedly arranged at the end of the housing 1 close to the water inlet 41, and the water inlet 41 is fixedly arranged at the end of the housing 1 close to the ground. A filter assembly 5 is arranged in the air inlet pipe 11. The filter assembly 5 includes a first filter screen 51 fixedly arranged in the air inlet pipe 11, a second filter screen 52, and a filter element 53 arranged between the first filter screen 51 and the second filter screen 52. The first filter screen 51 and the second filter screen 52 are both fixedly connected to the air inlet pipe 11, and the filter element 53 is fixedly connected to the first filter screen 51 and the second filter screen 52, respectively. In the embodiment of the present application, the filter element 53 is made of activated carbon.

[0038] A baffle 6 is fixedly mounted in the housing 1 and is fixedly connected to the spiral blade 3. One side of the baffle 6 is fixedly connected to the outer wall of the mounting tube 2, and the other side is fixedly connected to the inner wall of the housing 1. The baffle 6 has a plurality of ventilation holes 61. A connection hole 62 is also formed in the baffle 6, through which the spiral water pipe 4 passes and is fixedly connected to the baffle 6. The baffle 6 is made of copper or aluminum.

[0039] Reference Figure 4The spiral water pipe 4 is fixedly provided with a plurality of heat-conducting rings 43, and the plurality of heat-conducting rings 43 are evenly distributed on the spiral water pipe 4. A reinforcing plate 44 is fixedly provided on the spiral water pipe 4, and one end of the reinforcing plate 44 away from the spiral water pipe 4 is fixedly connected to the box body 1.

[0040] The implementation principle of a rotary kiln tail gas heat energy recovery device in an embodiment of the present application is as follows: the tail gas enters the housing 1 through the air inlet pipe 11 and the filter assembly 5. The filter assembly 5 reduces the content of impurities such as dust in the tail gas by filtering, thereby reducing the phenomenon of dust and other impurities adhering to the spiral water pipe 4, and further reducing the impact of dust and other impurities on the heat exchange efficiency between the tail gas and water. The tail gas flows in the spiral gas flow channel 13 in the housing 1, and the water flows in the spiral water pipe 4. The tail gas and water exchange heat during the flow process. When the tail gas flows in the spiral gas flow channel 13, it is blocked by the baffle 6. The baffle 6 increases the residence time of the tail gas in the housing 1, thereby improving the heat exchange efficiency between the tail gas and water. The provision of the heat-conducting ring 43 increases the heat exchange area between the spiral water pipe 4 and the tail gas, thereby improving the heat exchange efficiency between the tail gas and water.

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

Claims

1. A rotary kiln tail gas heat recovery device, characterized by: The invention comprises a box body (1), a mounting tube (2) arranged in the box body (1), a spiral blade (3) arranged on the mounting tube (2), a spiral water pipe (4) arranged in the box body (1), an air inlet pipe (11) and an air outlet pipe (12) communicated with the box body (1); the end of the spiral blade (3) away from the mounting tube (2) is connected to the box body (1), the spiral blade (3) forms a spiral gas flow channel (13) in the box body (1), the spiral water pipe (4) is arranged in the spiral gas flow channel (13), one end of the spiral water pipe (4) is a water inlet (41), and the other end is a water outlet (42).

2. The rotary kiln tail gas heat recovery device according to claim 1, characterized in that: The air inlet pipe (11) is arranged at an end of the box body (1) away from the water inlet (41), the air outlet pipe (12) is arranged at an end of the box body (1) close to the water inlet (41), and the water inlet (41) is arranged at an end of the box body (1) close to the ground.

3. The rotary kiln tail gas heat recovery device according to claim 2, characterized in that: A plurality of heat-conducting rings (43) are fixedly arranged on the spiral water pipe (4).

4. The rotary kiln tail gas heat recovery device according to claim 3, characterized in that: A reinforcing plate (44) is provided on the spiral water pipe (4), and one end of the reinforcing plate (44) away from the spiral water pipe (4) is connected to the box (1).

5. The rotary kiln tail gas heat recovery device according to claim 4, characterized in that: A baffle (6) is provided in the box (1), the baffle (6) being connected to the spiral blade (3), one side of the baffle (6) being connected to the outer wall of the mounting tube (2), and the other side being connected to the inner wall of the box (1), and a ventilation hole (61) being provided on the baffle (6).

6. The rotary kiln tail gas heat recovery device according to claim 5, characterized in that: A connecting hole (62) is provided on the baffle (6), and the spiral water pipe (4) passes through the connecting hole (62) and is connected to the baffle (6).

7. The rotary kiln tail gas heat recovery device according to claim 6, characterized in that: The baffle (6) is made of copper or aluminum.

8. The rotary kiln tail gas heat recovery device according to claim 7, characterized in that: A filter assembly (5) is provided in the air inlet pipe (11).

9. The rotary kiln tail gas heat recovery device according to claim 8, characterized in that: The filter assembly (5) comprises a first filter screen (51) and a second filter screen (52) arranged in the air inlet pipe (11), and a filter element (53) arranged between the first filter screen (51) and the second filter screen (52).

Images