Dual-system cracking equipment

Abstract

The utility model relates to the technical field of cracking equipment, in particular to dual-system cracking equipment which comprises a tail gas conveying pipeline connected with the cracking equipment, a tail gas treatment module is arranged on the tail gas conveying pipeline, and the tail gas treatment module comprises a first tail gas treatment device and a second tail gas treatment device. The oil gas treatment device is flexibly selected according to different materials treated by the cracking equipment, the equipment can normally operate when plastic and rubber materials are alternated, emergency pressure relief treatment can be performed when the buffer tank and the catalytic tower body are detected to be abnormal through the design of the emergency pressure relief pipeline, the equipment is prevented from being damaged, and the device is simple in structure and convenient to use. The operation is convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of cracking equipment, in particular to a double-system cracking equipment used for plastic and rubber processing. Background Art

[0002] In the process of plastic cracking, due to the large molecular weight of plastic oil and gas, it is necessary to install a catalytic tower device after the cracking link to cut the molecular chain of plastic oil and gas during the production process to prevent waxing and clogging of pipelines and subsequent oil storage tanks. However, in the process of tire cracking, rubber itself is a petroleum product. In the absence of oxygen and high temperature, the rubber in the waste tire will undergo a decomposition reaction, and the unsaturated macromolecular rubber hydrocarbons will break and split into small molecular hydrocarbon compounds, re-forming a gaseous hydrocarbon mixture of C1 to C4 and a petroleum liquid hydrocarbon mixture above CS. In the process of using two raw materials for production separately, the effects of different materials often have a large gap, resulting in unsatisfactory cracking reactions. During the operation, since plastic oil and gas often contain ash impurities, the catalyst resistance increases, resulting in an increase in the pressure of the cracking main furnace, causing safety hazards; in the process of rubber cracking, due to the different cracking rates, the pressure in the pipeline is unstable, which is prone to safety hazards. Summary of the invention

[0003] This utility model patent aims to design a dual system structure that can ensure safe and stable operation of the main cracking furnace when plastic and rubber raw materials are used alternately. It can not only ensure the catalytic effect during the cracking of plastics, but also adjust the pressure inside the system during the cracking of rubber, save energy, and extend the service life of the equipment to a certain extent.

[0004] In order to achieve the above-mentioned purpose, the embodiment of the utility model specifically adopts the following technical scheme: a dual-system cracking equipment, including a tail gas delivery pipeline connected to the cracking equipment, a tail gas treatment module is arranged on the tail gas delivery pipeline, and the tail gas treatment module includes a first tail gas treatment device, a second tail gas treatment device and an emergency pressure relief pipeline, and the first tail gas treatment device and the second tail gas treatment device are both provided with a pressure relief tee connected to the emergency pressure relief pipeline.

[0005] As a further improvement of the above technical solution:

[0006] The first tail gas treatment device comprises a buffer tank, one end of which is provided with an oil and gas inlet connected to the tail gas delivery pipeline, and the other end of which is provided with an exhaust assembly.

[0007] The exhaust assembly comprises an exhaust valve, one end of which is connected to the buffer tank, and the other end of which is provided with a check valve.

[0008] The second exhaust gas treatment device includes a catalytic tower body, on which are arranged in sequence along the oil and gas transportation direction an oil and gas inlet 2, a first filter part, a catalytic part, a second filter part and an oil and gas outlet 2, and pressure sensors are arranged at the top and bottom of the catalytic tower body.

[0009] The first filter part, the catalytic part and the second filter part are all provided with a feed inlet and a discharge outlet.

[0010] A heat-insulating interlayer is arranged outside the catalytic part, a temperature sensor is arranged inside the heat-insulating interlayer, and a heating pipe for connecting to an external heat source is arranged on the side wall of the heat-insulating interlayer.

[0011] The beneficial effects of the embodiments of the utility model are as follows: 1. A dual-system cracking device comprises an exhaust gas delivery pipeline connected to the cracking device, wherein the exhaust gas delivery pipeline is provided with an exhaust gas treatment module, wherein the exhaust gas treatment module comprises a first exhaust gas treatment device and a second exhaust gas treatment device, and the oil and gas treatment device can be flexibly selected according to the different materials processed by the cracking device to ensure that the equipment can operate normally when plastic and rubber materials are alternately processed.

[0012] 2. The design of the emergency pressure relief pipeline can perform emergency pressure relief when abnormalities are detected in the buffer tank and the catalytic tower to avoid equipment damage. At the same time, the equipment has a simple structure and is easy to operate, and can also provide safety protection for the dual oil and gas processing device. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0014] Figure 2 It is a side view of the utility model;

[0015] Figure 3 It is a top view of the utility model;

[0016] Figure 4 It is a structural block diagram of the utility model.

[0017] In the figure: 1. exhaust gas transmission pipeline; 2. first exhaust gas treatment device; 3. second exhaust gas treatment device; 4. emergency pressure relief pipeline; 5. pressure relief tee; 6. buffer tank; 7. oil and gas inlet 1; 8. exhaust valve; 9. check valve; 10. catalytic tower body; 11. oil and gas inlet 2; 12. first filter section; 13. catalytic section; 14. second filter section; 15. thermal insulation interlayer; 16. pressure sensor; 17. heating pipeline. DETAILED DESCRIPTION

[0018] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0019] like Figure 1-3 As shown, the dual-system cracking equipment of the present embodiment includes a tail gas delivery pipeline 1 connected to the cracking equipment, a tail gas treatment module is arranged on the tail gas delivery pipeline 1, the tail gas treatment module includes a first tail gas treatment device 2, a second tail gas treatment device 3 and an emergency pressure relief pipeline 4, and the first tail gas treatment device 2 and the second tail gas treatment device 3 are both provided with a pressure relief tee 5 connected to the emergency pressure relief pipeline 4. Through the design of the first tail gas treatment device 2 and the second tail gas treatment device 3, the tail gas treatment equipment can be replaced when the cracking equipment alternates between two different materials, rubber and plastic. The design of the dual tail gas treatment system can flexibly match the cracking operation of the cracking equipment on rubber or plastic. On the basis of the two tail gas treatment devices, an emergency pressure relief pipeline 4 is added, which can perform emergency pressure relief and exhaust when an emergency occurs or the two cracking devices cannot operate normally, thereby ensuring the safety of the equipment in an emergency.

[0020] The first exhaust gas treatment device 2 includes a buffer tank 6, one end of the buffer tank 6 is provided with an oil and gas inlet 7 connected to the exhaust gas delivery pipeline 1, and the other end is provided with an exhaust assembly, the exhaust assembly includes an exhaust valve 8, one end of the exhaust valve 8 is connected to the buffer tank 6, and the other end is provided with a check valve 9. When the rubber is cracked, oil and gas enter the buffer tank 6 from the oil and gas inlet 7 for pressure stabilization, and then are transported to the next process through the exhaust assembly. The exhaust valve 8 can be used to control the exhaust volume of the buffer tank 6. A pressure sensor is installed in the buffer tank 6. The pressure in the buffer tank 6 is detected by the pressure sensor, and the opening and closing degree of the exhaust valve is controlled to control the exhaust volume.

[0021] The second tail gas treatment device 3 includes a catalytic tower body 10, on which an oil and gas inlet 11, a first filter 12, a catalytic part 13, a second filter 14 and an oil and gas outlet 1 are arranged in sequence along the oil and gas conveying direction. Pressure sensors 16 are arranged on the top and bottom of the catalytic tower body 10. The first filter 12, the catalytic part 13 and the second filter 14 are used to filter and decompose the oil and gas. When the plastic is cracked, the high-temperature oil and gas enter the catalytic tower body through the oil and gas inlet 11, and the macromolecular wax is converted into a small molecular structure to avoid pipeline blockage. The function of the pressure sensor 16 is to monitor the pressure difference between the top and bottom of the catalytic tower body 10 in real time. When the pressure difference exceeds a certain range, it proves that blockage occurs in the catalytic tower body 10. At this time, close the oil and gas inlet 11 to cut off the air intake, carry out maintenance or replace the packing, and at this time, pass the oil and gas into the buffer tank 6 through the oil and gas inlet 7 to ensure the safe use of the catalytic tower body 10. After replacing the packing of the first filter part 12, the catalytic part 13, and the second filter part 14, close the oil and gas inlet 7 again, and continue to pass the oil and gas into the catalytic tower body 10 for normal operation. If pressure disturbance occurs in the buffer tank 6 and the catalytic tower body 10 at the same time, it is necessary to close the oil and gas inlet 7 and the oil and gas inlet 11 at the same time, and open the pressure relief valves of the buffer tank 6 and the catalytic tower body 10 for pressure relief. At the same time, open the pressure relief tee 5 to transport the oil and gas in the buffer tank 6 and the catalytic tower body 10 through the emergency pressure relief pipeline 4 to the next step for treatment.

[0022] The first filter part 12, the catalytic part 13 and the second filter part 14 are all provided with a feed inlet and a discharge inlet for replacing fillers.

[0023] An insulating interlayer 15 is provided on the outside of the catalyst section 13, and a temperature sensor is provided in the insulating interlayer 15. A heating pipe 17 for connecting to an external heat source is provided on the side wall of the insulating interlayer. The temperature sensor can monitor the temperature in the insulating interlayer in real time. When the temperature is too low, hot air is added through the external heat source to provide insulating heat for the insulating layer. In this embodiment, the preferred heat source is the high-temperature oil and gas generated during the operation of the cracking furnace. The catalyst section 13 is insulated by the high-temperature oil and gas, which saves resources and realizes heat recycling, avoiding the catalyst section temperature being too low to cause poor catalytic effect. When the temperature is detected to be too high, the intake of the oil and gas inlet 11 is reduced, and at the same time, the cold air inlet outside the catalyst section 13 is opened, and the fan (not shown in the figure) is turned on to cool the catalyst section.

[0024] It should be noted that in the description of the present invention, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for the convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0025] In addition, it should be noted that in the description of the present utility model, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For those skilled in the art, the specific meanings of the above terms in the present utility model can be understood according to the specific circumstances. The term "includes" or any other similar term is intended to cover non-exclusive inclusion, so that a process, article, or equipment / device that includes a series of elements includes not only those elements, but also other elements that are not explicitly listed, or also includes elements inherent to these processes, articles, or equipment / devices.

[0026] So far, the technical solution of the present invention has been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A dual-system cracking device, comprising a tail gas delivery pipeline (1) connected to the cracking device, wherein the tail gas delivery pipeline (1) is provided with a tail gas treatment module, characterized in that: The exhaust gas treatment module comprises a first exhaust gas treatment device (2), a second exhaust gas treatment device (3) and an emergency pressure relief pipeline (4); the first exhaust gas treatment device (2) and the second exhaust gas treatment device (3) are both provided with a pressure relief tee (5) connected to the emergency pressure relief pipeline (4).

2. The dual system cracking device according to claim 1, characterized in that: The first tail gas treatment device (2) comprises a buffer tank (6), one end of which is provided with an oil and gas inlet (7) connected to the tail gas delivery pipeline (1), and the other end of which is provided with an exhaust assembly.

3. The dual system cracking device according to claim 2, characterized in that: The exhaust assembly comprises an exhaust valve (8), one end of the exhaust valve (8) is connected to the buffer tank (6), and the other end is provided with a check valve (9).

4. The dual-system cracking device according to claim 1, characterized in that: The second exhaust gas treatment device (3) comprises a catalytic tower body (10), on which a second oil and gas inlet (11), a first filter part (12), a catalytic part (13), a second filter part (14) and a second oil and gas outlet are sequentially arranged along the oil and gas conveying direction, and pressure sensors (16) are arranged at the top and bottom of the catalytic tower body (10).

5. The dual system cracking device according to claim 4, characterized in that: The first filtering part (12), the catalytic part (13) and the second filtering part (14) are all provided with a feed inlet and a discharge inlet.

6. The dual system cracking device according to claim 4, characterized in that: A heat-insulating interlayer (15) is arranged outside the catalytic part (13), a temperature sensor is arranged inside the heat-insulating interlayer (15), and a heat supply pipe (17) for connecting to an external heat source is arranged on the side wall of the heat-insulating interlayer.

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