Air preheating device utilizing kiln body waste heat

Abstract

The utility model belongs to the technical field of kiln body heat dissipation and recovery, and particularly relates to an air preheating device utilizing kiln body waste heat, which is characterized by comprising a flue gas pipe, an air pipe, a flue gas inlet, a flue gas outlet, a dust removal baffle plate, a flange, a dust collection part, a dust collection outlet slideway, a dust collection outlet sliding plate and an air pipe interface thread. The flue gas pipe and the air pipe are combined in a nested mode, flue gas and air flow reversely, reverse heat exchange is achieved, heat carried by the flue gas of the kiln body preheats the air, the heat is reused, the air is better preheated by the flue gas through the arrangement mode that the flue gas pipe is arranged outside and the air pipe is arranged inside, and the heat preservation effect is achieved. The arrangement mode of the dust removal baffles in the flue gas pipe is beneficial to convective heat exchange and maximum dust removal of flue gas, dust particles are collected by the dust collection position and finally discharged through the dust collection outlet, the dust content of the flue gas is reduced, and environmental protection is facilitated.

Description

Technical Field

[0001] The utility model belongs to the technical field of waste heat recovery of kiln bodies, and particularly relates to an air preheating device utilizing the waste heat of a kiln body. Background Art

[0002] In industrial production, the energy consumption and energy loss of kiln bodies account for a relatively large proportion of the total energy consumption of the production line, and there is great potential for energy conservation and consumption reduction. The Chinese invention patent with the authorization announcement number CN219934678U discloses a waste heat recovery device for a kiln barrel body, which recovers and utilizes the radiant heat energy of the rotary kiln barrel body by installing a collector on the rotary kiln barrel body. The Chinese invention patent with the authorization announcement number CN116147369B discloses a device for generating steam by using the radiant heat of a kiln furnace kiln body and its usage method, which conducts the emitted radiant heat into a heat collecting cover. The above two patents are for the recovery and utilization of waste heat from rotary kilns and calcining kilns, but do not involve the recovery and utilization of waste heat from light burned magnesia kiln bodies. Content of the Utility Model

[0003] The purpose of the utility model is to provide an air preheating device utilizing the waste heat of a kiln body, realizing the recovery and utilization of the waste heat of a light burned magnesia kiln body and dust removal of flue gas.

[0004] An air preheating device utilizing the waste heat of a kiln body, characterized in that: the air preheating device includes a flue gas pipe, an air pipe, a flue gas inlet, a flue gas outlet, a dust removal baffle, a flange, a dust collection place, a dust collection outlet slideway, a dust collection outlet slide plate and a thread of an air pipe interface,

[0005] Both the flue gas pipe and the air pipe are hollow cylinders, the air pipe is embedded in the flue gas pipe, and dust removal baffles and corresponding dust collection places are evenly arranged in the flue gas pipe. There is a dust collection outlet on the bottom plate of the dust collection place that can be opened through a slideway, and the dust collection outlet slide plate can be directly pulled open by a handle. The flue gas inlet and the flue gas outlet are arranged outside the flue gas pipeline.

[0006] The dust removal baffle is semi-circular, so that the paths for the flue gas to pass through are distributed at intervals up and down, which is beneficial to convective heat transfer and dust removal.

[0007] The dust collection place is located between the dust removal baffle with a gap at the lower part and the dust removal baffle with a gap at the upper part, and has a space with a certain inclination. There is a dust collection outlet at the lower part of the dust collection place.

[0008] For the dust collection outlet, there is a dust collection outlet slide plate on the bottom plate of the dust collection place that can be pulled open through a slideway, and the dust collection outlet slide plate can be directly pulled open by a handle. When the dust collection outlet is opened, the dust can be discharged.

[0009] Advantages of the present utility model: 1. The air duct is nested with the flue gas duct, and the heat carried by the flue gas is used to preheat the air, and the air duct is arranged inside to reduce heat loss. 2. The dust removal baffle in the flue gas duct is arranged to enable the flue gas to flow up and down. This baffle arrangement form is conducive to convective heat transfer and dust removal. Some dust particles in the flue gas are collected at the dust collection place, and the cleaner flue gas is discharged, which is beneficial to reducing air pollution. Description of the Drawings

[0010] Figure 1 An air preheating device for utilizing the waste heat of the kiln body

[0011] Figure 2 It is a sectional view of the device

[0012] Wherein: 1 is the air preheating device, 11 is the flue gas outlet, 12 is the flue gas pipe, 13 is the air pipe, 14 is the air pipe interface thread, 15 is the dust collection outlet slideway, 16 is the dust collection place, 17 and 18 are the dust removal baffles, 19 is the flange, 20 is the flue gas inlet, and 2 is the dust collection outlet slide plate. Specific Embodiment

[0013] As shown in the figure, an air preheating device for utilizing the waste heat of the kiln body, the air preheating device 1 includes a flue gas pipe 12, an air pipe 13, a flue gas inlet 20, a flue gas outlet 11, a dust removal baffle 18, a flange 19, a dust collection place 16, a dust collection outlet slideway 15, a dust collection outlet slide plate 2 and an air pipe interface thread 14.

[0014] Both the flue gas pipe 12 and the air pipe 13 are hollow cylinders. The air pipe is embedded in the flue gas pipe. The dust removal baffles 18 and the corresponding dust collection places 16 are evenly arranged in the flue gas pipe. There is a dust collection outlet on the bottom plate of the dust collection place that can be opened through the slideway. The dust collection outlet slide plate 2 can be directly pulled open by the handle. There are a flue gas inlet 20 and a flue gas outlet 11 outside the flue gas pipe.

[0015] Both ends of the inner nested air pipe have threads 14 to be connected to the air inlet. The air pipe inside can be better preheated by the flue gas and is conducive to heat preservation after preheating.

[0016] The semi-circular dust removal baffles 18 are distributed at intervals up and down. This arrangement form is conducive to convective heat transfer and dust removal.

[0017] The dust collection place 16 is located at the position between the dust removal baffle 18 with a gap at the lower part and the dust removal baffle 17 with a gap at the upper part, and there is a space with a certain inclination, so that the dust slides down and accumulates at the dust collection outlet. There is a dust collection outlet on the lower wall surface of the dust collection place.

[0018] For the dust collection outlet, there is a dust collection outlet slide plate 2 on the bottom plate of the dust collection place that can be pulled open through the slideway. The dust collection outlet slide plate can be directly pulled open by the handle. When the dust collection outlet is opened, the dust can be discharged.

[0019] During the use of the utility model, the flue gas coming out of the flame nozzle enters the flue gas pipe through the flue gas inlet 20. Most of the hot flue gas will concentrate in the upper part of the flue gas pipe. Therefore, most of the flue gas impacts the dust removal baffle 18. Due to the different inertia of the gas and dust, when about to impact the dust removal baffle, the air flow changes direction sharply. Some dust particles impact the dust removal baffle due to inertia, lose the kinetic energy to continue flying, and fall into the dust collection area. The flue gas with the changed direction flows towards the lower gap of the dust removal baffle. The flue gas flowing out through the lower gap of the dust removal baffle mostly concentrates in the lower part of the flue gas pipe at this time. Therefore, most of it will impact the dust removal baffle 17. Similarly, part of the dust removal is achieved, and the dust falls into the dust collection area. The subsequent air flow movement is the same. The flow direction of the flue gas is changed multiple times, thus realizing multiple dust removals of the flue gas. The cleaner flue gas is discharged through the flue gas outlet 11. When the hot flue gas flows in the external flue gas pipe, it will conduct heat transfer with the normal-temperature air in the internal air pipe to realize the preheating of the air. And the reverse flow of the flue gas and the air is beneficial to strengthening heat transfer. The air pipe inside can also reduce heat loss. The dust in the dust collection area can be discharged by directly pulling open the dust collection outlet slide plate 2 through the handle on the bottom plate of the dust collection area. When the dust collection outlet is opened, the dust can be discharged.

[0020] The utility model not only realizes the preheating of air by using the heat dissipation of the kiln body, and the way that the air pipe is inside and the flue gas pipe is outside and flows reversely enables the air to be better preheated and insulated, achieving the maximum utilization of the flue gas to preheat the air. Moreover, the arrangement of the internal baffles of this utility model is beneficial to convective heat transfer and the maximum dust removal of the flue gas, making the quality of the discharged flue gas better and being beneficial to environmental protection.

Claims

1. An air preheating device using the waste heat of a kiln body, characterized in that: The air preheating device (1) includes a flue gas pipe (12), an air pipe (13), a flue gas inlet (20), a flue gas outlet (11), a dust removal baffle (18), a flange (19), a dust collection area (16), a dust collection outlet slideway (15), a dust collection outlet slide plate (2), and an air pipe interface thread (14). Both the flue gas pipe and the air pipe are hollow cylinders. The air pipe (13) is embedded in the flue gas pipe (12). Dust removal baffles (18) and corresponding dust collection areas (16) are evenly arranged in the flue gas pipe. There is a dust collection outlet on the bottom plate of the dust collection area that can be opened through the slideway. The dust collection outlet slide plate (2) can be directly pulled open by a handle. There are a flue gas inlet (20) and a flue gas outlet (11) outside the flue gas pipeline.

2. The air preheating device using the waste heat of the kiln body according to claim 1, characterized in that: The dust removal baffle (18) is semi-circular, so that the paths for the flue gas to pass through are spaced up and down, which is beneficial to convective heat transfer and dust removal.

3. The air preheating device using the waste heat of the kiln body according to claim 1, characterized in that: The dust collection area (16) is located between the dust removal baffle with a gap at the lower part and the dust removal baffle with a gap at the upper part, and has a space with a certain inclination. There is a dust collection outlet at the lower part of the dust collection area.

4. The air preheating device using the waste heat of the kiln body according to claim 1, wherein: For the dust collection outlet, there is a dust collection outlet slide plate (2) on the bottom plate of the dust collection area that can be pulled open through the slideway (15). The dust collection outlet slide plate can be directly pulled open by a handle. When the dust collection outlet is opened, the dust can be discharged.

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