Improved structure of pyrolyzing furnace for tire carbon black regeneration process

Abstract

An improved structure of a pyrolyzing furnace for a tire carbon black regeneration process comprises a central shaft of the pyrolyzing furnace, a flue gas inlet sleeve, a high-temperature flue gas inlet and a high-temperature flue gas outlet, a high-temperature-resistant heat preservation layer is arranged outside the flue gas inlet sleeve in the center of the pyrolyzing furnace, cooling air pipes are arranged in the high-temperature-resistant heat preservation layer at intervals, cooling air is cooled through a gap between the cooling air and the central shaft, and hot air is discharged outdoors. And the central shaft is fixed and rotated by the bearing and the bearing seat. The four cooling air pipes are arranged at intervals, and each cooling air pipe is provided with a cooling air inlet and a cooling air outlet. By adding the cooling structure of the heat preservation layer and the cold air pipe, after the air speed and the flow speed are increased, the temperature of the shell is reduced to about 50 DEG C, the swelling amount is reduced, the bearing seat is fixed to the end plate support in a sliding mode, the jerk amount is reduced, operation is safe, and concentricity and normal production operation are guaranteed.

Description

Technical Field

[0001] The utility model relates to a pyrolysis furnace device in a tire regeneration cracking carbon black process. Background Art

[0002] The process flow of tire recycled carbon black is as follows: tire rubber particles are pneumatically transported to the rubber particle silo, and quantitatively fed into the cracking device through a screw feeder. The rubber particles rotate and heat in the cracking device, and crack into high-temperature oil and gas and crude carbon black. The high-temperature oil and gas are quickly cooled by the quenching tower and then enter the secondary condenser. The oil and gas are fully contacted with gas and liquid and heat exchanged in the quenching tower and the secondary condenser to achieve oil and gas separation. The condensed oil is sent to the oil storage tank for temporary storage, and the non-condensable gas is sent to the gas storage tank for temporary storage. After cracking, the crude carbon black is screened and impurities are removed, and then transported to the carbon black post-processing area. After stirring, grinding, granulation, and drying, it enters the finished product storage tank and is packaged according to customer needs. The non-condensable gas in the gas storage tank is sent to the hot air furnace, and after combustion, high-temperature flue gas is generated to provide heat for the cracking device. After heat exchange and cooling, the high-temperature flue gas is led to the carbon black post-processing area to heat and dry the carbon black. The dried flue gas is treated by the desulfurization and denitrification system and discharged after meeting the standards. The cracking device is divided into three sections, among which the inlet temperature of the flue gas in the center of the pyrolysis section is controlled at 550-650°C. Since there are no insulation and cooling measures between the center axis and the flue gas casing, the outer surface temperature of the short tube of the center axis is also very high, and the expansion is large. No bearings are used (the displacement of the bearing balls is not that large), and it can only be fixed and rotated by supporting wheels.

[0003] During operation, due to the thermal expansion of the center shaft, the rollers have large rotation runout and inaccurate concentricity, resulting in one bearing rotating while the other does not, and sometimes getting stuck and damaged. Due to the high surface temperature of the contact rollers, the heat transfer to the rollers is high, and the high-temperature butter is easy to dry, resulting in poor results. The high surface temperature also causes operators to get burned, which affects normal production operations. Summary of the invention

[0004] The utility model provides an improved structure of a pyrolysis furnace in a tire regeneration carbon black process, which can effectively reduce the temperature of an external body contacting a central axis and a rotating part and adopts bearing transmission to improve concentricity and stability.

[0005] The utility model is realized through the following technical scheme: an improved structure of a pyrolysis furnace in a tire regeneration carbon black process, comprising a central axis of the pyrolysis furnace, a smoke inlet sleeve, and a high-temperature smoke inlet and outlet. Its main technical feature is that a high-temperature resistant thermal insulation layer is arranged outside the smoke inlet sleeve at the center of the pyrolysis furnace, and a cooling air pipe is arranged inside the high-temperature resistant thermal insulation layer. The cooling air is cooled through the gap with the central axis, and the hot air is discharged to the outside. The central axis is fixed and rotated by a bearing and a bearing seat.

[0006] The cooling air pipes are arranged in four pieces at intervals, and each piece has a cooling air inlet and a cooling air outlet.

[0007] Due to the requirements of tire regeneration carbon black cracking process, high-temperature flue gas of 550-650℃ needs to be introduced. Due to the high surface temperature of the central rotating shaft and the large thermal expansion, in order to avoid damaging the bearing, the central shaft cannot be rotated by bearings, and can only be rotated by supporting wheels. By adding a thermal insulation layer and a cooling structure of a cold air duct, the wind speed and flow rate are accelerated, so that the shell temperature is reduced to about 50℃ and the expansion is reduced. The bearing seat is fixed on the end plate support in a sliding form, which reduces the runout, ensures safe operation, and ensures concentricity and normal production operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is a schematic diagram of the structure of the cracking device;

[0009] Figure 2 It is a schematic diagram of the structure of the pyrolysis section of the utility model. DETAILED DESCRIPTION

[0010] like Figure 1 , Figure 2 As shown, the improved structure of the pyrolysis furnace in the tire regeneration carbon black process includes the central axis 1 of the pyrolysis furnace, the smoke inlet sleeve 2, the high-temperature smoke inlet and outlet 3, 4, and a high-temperature resistant heat-insulating layer 5 is arranged outside the smoke inlet sleeve in the center of the pyrolysis furnace. The high-temperature resistant heat-insulating layer is provided with cooling air pipes 6, 6-1 at intervals. The cooling air is cooled through the gap with the central axis, and the hot air is discharged to the outside. The central axis is fixed and rotated by the bearing and the bearing seat 7. There are 4 cooling air pipes at intervals, each of which has a cooling air inlet 6-2 and a cooling air outlet 6-3, and the inner diameter is 12mm. There are also high-temperature grease injection ports 8 and graphite packings 9 in the figure.

Claims

1. An improved structure of a pyrolysis furnace for tire regeneration carbon black process, comprising a central axis of the pyrolysis furnace, a flue gas inlet sleeve, and a high-temperature flue gas inlet and outlet, characterized in that A high temperature resistant insulation layer is arranged outside the smoke inlet sleeve at the center of the pyrolysis furnace, and a cooling air pipe is arranged inside the high temperature resistant insulation layer. The cooling air is cooled through the gap with the central axis, and the hot air is discharged to the outside. The central axis is fixed and rotated by bearings and bearing seats.

2. The improved structure of the pyrolysis furnace for the tire regeneration carbon black process according to claim 1, characterized in that The cooling air pipes are arranged in four pieces at intervals, and each piece has a cooling air inlet and a cooling air outlet.

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