Continuous feeding device of cracking furnace

Abstract

According to the continuous feeding device of the cracking furnace, a corresponding oil seal circulating device is designed aiming at the continuous feeding device, so that the continuous feeding device has a feeding end sealing function while uninterrupted raw material conveying is guaranteed, and the design purpose that high-temperature cracking gas in the furnace can be sealed and does not overflow during working and emergency shutdown is achieved. The continuous feeding device of the cracking furnace comprises a spiral conveyor communicated with one side of a furnace body, a feed end of the spiral conveyor is connected with a stock bin, and a sealing oil way assembly is connected between the spiral conveyor and the stock bin in series.

Description

Technical Field

[0001] The utility model relates to a continuous feeding device specially used for a cracking furnace for recycling treatment of waste materials, belonging to the field of waste rubber and plastic treatment and recycling. Background Art

[0002] With the rapid development of green energy and environmental protection technologies in China, the technical requirements for the efficiency and safety of recycling of waste materials are becoming increasingly higher, such as the recycling of tires used in various aircraft and vehicles.

[0003] At present, there is a large amount of waste tires to be processed in China. If they are piled up, landfilled or incinerated, they will cause secondary pollution to the environment. The existing technology adopts cracking treatment to effectively achieve the results of "reduction, resource utilization and harmlessness" through resource utilization, and has become the preferred method for the final treatment of waste tires.

[0004] Tire pyrolysis involves heating waste tires in a sealed device under oxygen-free or oxygen-deficient conditions, undergoing a series of physical and chemical reactions. The resulting product is approximately 45% pyrolysis oil, 35% pyrolysis carbon black, 12% steel wire, and 8% pyrolysis non-condensable gas. Currently, the main type of pyrolysis equipment is continuous. Continuous pyrolysis equipment is equipped with a continuous feeder to ensure continuous operation of the entire pyrolysis production line and ensure material transportation. The pyrolysis furnace must be effectively sealed to prevent high-temperature pyrolysis gas from escaping the feeder and escaping into the air, potentially causing combustion or even explosion. Furthermore, the pyrolysis furnace must be properly sealed during emergency shutdowns.

[0005] In view of this, this patent application is filed. Utility Model Content

[0006] The present application proposes a continuous feeding device for a cracking furnace, which aims to solve the problems and shortcomings of the above-mentioned prior art and is designed with a corresponding oil seal circulation device for the continuous feeding device, so as to ensure uninterrupted transportation of raw materials while having a sealing function at the feed end, thereby achieving the design purpose of being able to seal the high-temperature cracking gas in the furnace from overflowing during operation and emergency shutdown.

[0007] To this end, the continuous feeding device of the cracking furnace includes a screw conveyor connected to one side of the furnace body, a silo is connected to the feeding end of the screw conveyor, and a sealing oil circuit component is connected in series between the screw conveyor and the silo.

[0008] Furthermore, the sealed oil circuit assembly includes an upper oil storage tank and a lower oil storage tank. The upper oil storage tank is connected to the oil inlet of the silo through an oil pipe equipped with a first electrically controlled valve, the oil outlet of the screw conveyor is connected to the lower oil storage tank through an oil pipe equipped with a second electrically controlled valve, and the lower oil storage tank is connected to the upper oil storage tank through an oil pipe equipped with an oil return pump.

[0009] Furthermore, the vertical height of the pipeline connecting the upper oil storage tank and the silo is lower than the connection position between the furnace body and the screw conveyor.

[0010] Furthermore, the screw conveyor includes a motor and a conveying shaft connected by the motor, and a spiral blade group is provided on the conveying shaft. A certain gap is maintained between the outer edge of the spiral blade group and the conveyor pipe wall, and the silo is connected vertically above the conveyor pipe wall.

[0011] As mentioned above, the continuous feeding device of the cracking furnace proposed in this application has the advantage that it can effectively ensure that the high-temperature cracking gas in the cracking furnace will not overflow along the feeding device while ensuring continuous feeding, and at the same time has high safety performance and cracking work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The present application will now be further described with reference to the following drawings;

[0013] Figure 1 This is a schematic structural diagram of the continuous feeding device described in this application;

[0014] Figure 2 Schematic diagram of oil seal in normal stop and emergency stop state during cracking operation; DETAILED DESCRIPTION

[0015] In order to further illustrate the technical means adopted by this application to achieve the predetermined design objectives, the following preferred implementation scheme is proposed in conjunction with the accompanying drawings.

[0016] The following description sets forth specific details to facilitate a thorough understanding of the present application. However, the present application can be implemented in a variety of other ways than those described herein, and those skilled in the art may make similar generalizations without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0017] Example 1, as Figure 1 and Figure 2 As shown, the continuous feeding device of the cracking furnace described in the present application includes a screw conveyor 2 connected to one side of the furnace body 1, a silo 3 is connected to the feeding end of the screw conveyor 2, and a sealing oil circuit assembly 4 is connected in series between the screw conveyor 2 and the silo 3;

[0018] The screw conveyor 2 includes a motor 21 and a conveying shaft 22 driven by the motor 21. A spiral blade group 23 is provided on the conveying shaft 22. A certain gap is maintained between the outer edge of the spiral blade group 23 and the conveyor pipe wall 24. The conveyor pipe wall 24 is connected to the silo 3 vertically above the conveyor pipe wall 24.

[0019] The sealed oil circuit assembly 4 includes an upper oil storage tank 41 and a lower oil storage tank 42. The upper oil storage tank 41 is connected to the oil inlet 31 of the silo 3 through an oil pipe 44 equipped with a first electrically controlled valve 43. The oil outlet 25 of the screw conveyor 2 is connected to the lower oil storage tank 42 through an oil pipe 44 equipped with a second electrically controlled valve 45. The lower oil storage tank 42 is connected to the upper oil storage tank 41 through an oil pipe 44 equipped with an oil return pump 46.

[0020] In order to ensure the tightness of the oil sealing effect, the vertical height of the pipeline connecting the upper oil storage tank 41 and the silo 3 is lower than the connection position between the furnace body 1 and the screw conveyor 2.

[0021] Based on the structural design of the continuous feeding device of the above cracking furnace, the following cracking furnace sealing measures can be implemented:

[0022] Feed seal and emergency seal during emergency stop.

[0023] During normal cracking processing, the servo motor 21 is started to continuously convey the material falling from the silo into the interior of the conveyor tube wall 24 to the furnace body 1. The end of the conveying shaft 22 is a shaftless section, where the material fills the end of the conveyor tube wall 24 and the material seal prevents the combustible gas in the furnace body 1 from escaping.

[0024] When all the materials are fed into the furnace body 1 or the furnace is shut down in an emergency, since there is no more material on the conveyor pipe wall 24, the combustible gas in the furnace body 1 may overflow from the screw conveyor 2 and / or the silo 3;

[0025] To this end, the motor 21 can be turned off and the first electric control valve 43 at the upper end can be opened at the same time. The oil 50 in the upper oil storage tank 41 flows into the screw conveyor 2 along the oil pipe 44 until the oil 50 flows into the screw conveyor 2. Figure 2 As shown, the liquid level of the oil 50 completely seals the screw conveyor 2 and the silo 3 to ensure that the gas in the furnace body 1 does not overflow;

[0026] When the gas in the furnace body 1 is completely discharged, the second electrically controlled valve 45 at the lower end can be opened, and the oil 50 can flow back to the lower oil storage tank 42 through the oil outlet 25, and finally flow back to the upper oil storage tank 41 through the oil return pump 46 to be used next time.

[0027] As can be seen from the above process, the outstanding feature of the present application is that it can achieve sealing of the cracking furnace during feeding and emergency shutdown to prevent the combustible gas in the furnace from overflowing and causing danger.

[0028] In summary, the embodiments described above, combined with the accompanying drawings, are merely preferred solutions for achieving the objectives of this utility model. Those skilled in the art will be able to draw inspiration from these solutions and directly deduce other alternative structures that are consistent with the design concepts of this utility model. Other structural features derived from these solutions should also fall within the scope of the solutions described in this utility model.

Claims

1. A continuous feeding device for a cracking furnace, characterized in that: The invention comprises a screw conveyor connected to one side of the furnace body, a silo is connected to the feeding end of the screw conveyor, and a sealing oil circuit component is connected in series between the screw conveyor and the silo.

2. The continuous feeding device for a cracking furnace according to claim 1, characterized in that: The sealed oil circuit assembly includes an upper oil storage tank and a lower oil storage tank. The upper oil storage tank is connected to the oil inlet of the silo through an oil pipe equipped with a first electrically controlled valve, the oil outlet of the screw conveyor is connected to the lower oil storage tank through an oil pipe equipped with a second electrically controlled valve, and the lower oil storage tank is connected to the upper oil storage tank through an oil pipe equipped with an oil return pump.

3. The continuous feeding device for a cracking furnace according to claim 1, characterized in that: The vertical height of the pipeline connecting the upper oil storage tank and the silo is lower than the connecting position between the furnace body and the screw conveyor.

4. The continuous feeding device for a cracking furnace according to claim 3, characterized in that: The screw conveyor includes a motor and a conveying shaft connected by the motor. A spiral blade group is provided on the conveying shaft. A certain gap is maintained between the outer edge of the spiral blade group and the conveyor pipe wall, and the spiral blade group is connected to the silo vertically above the conveyor pipe wall.

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