Cracking furnace waste heat utilization device

Abstract

The utility model discloses a waste heat utilization device for a cracking furnace, relates to the technical field of cracking furnaces, and aims to solve the technical problems of high production cost, complex structure and high difficulty in installation and maintenance of the cracking furnace. The waste heat utilization device for the cracking furnace comprises a pyrolyzing furnace, a heat supply system and a volatilization system, wherein the pyrolyzing furnace is suitable for pyrolyzing materials; the heat supply system is connected with the pyrolyzing furnace and is suitable for heating the pyrolyzing furnace and generating tail gas with heat; the volatilization system communicates with the pyrolyzing furnace, tail gas generated by heating the pyrolyzing furnace through the heat supply system is suitable for flowing into the volatilization system to heat the volatilization system, and the volatilization system is suitable for volatilizing materials.

Description

Technical Field

[0001] This application relates to the field of pyrolysis furnace technology, and in particular to a device for utilizing waste heat from a pyrolysis furnace. Background Technology

[0002] In fields such as chemical production, pyrolysis is an important process for breaking down macromolecules into smaller molecules, and it is widely used in industries such as resource recycling, petrochemicals, and coal chemicals.

[0003] Cracking furnaces in related technologies typically include a pyrolysis furnace and a volatilization system, each with its own independent heating device to meet its temperature requirements. This not only undoubtedly increases the production cost of the equipment but also complicates the equipment structure and makes installation and maintenance more difficult. Utility Model Content

[0004] This application provides a waste heat utilization device for pyrolysis furnaces, which solves the technical problems of high production costs, complex structure, and difficult installation and maintenance of pyrolysis furnaces.

[0005] Based on this, this application provides a waste heat utilization device for a pyrolysis furnace, comprising: a pyrolysis furnace, a heating system, and a volatilization system. The pyrolysis furnace is suitable for pyrolyzing materials. The heating system is connected to the pyrolysis furnace and is suitable for heating the pyrolysis furnace and generating exhaust gas with heat. The volatilization system is connected to the pyrolysis furnace, and the exhaust gas generated by the heating system for the pyrolysis furnace is suitable for flowing into the volatilization system to heat the volatilization system. The volatilization system is suitable for volatilizing materials.

[0006] By introducing the exhaust gas generated from heating the pyrolysis furnace through the heating system into the volatilization system, the heat of the exhaust gas is effectively utilized. Traditional pyrolysis equipment often directly discharges or simply treats the exhaust gas before discharging it, resulting in a significant waste of energy. However, the pyrolysis furnace waste heat utilization device provided in this application utilizes the heat carried in the exhaust gas to heat the volatilization system, enabling the reuse of heat that might otherwise be wasted and improving the overall energy efficiency of the system.

[0007] This waste heat utilization method reduces the need for additional energy. For example, without this waste heat utilization, the evaporation system may require a separate heating device (such as electric heating or other fuel heating), which would consume more electricity or fuel. This device can provide the required heat for the evaporation system by utilizing the heat from the exhaust gas, thereby saving energy costs.

[0008] Furthermore, reducing reliance on additional heating devices lowers equipment operating costs. Since installing additional heating devices involves costs related to equipment purchase, installation, maintenance, and energy consumption, utilizing waste heat from the exhaust gas avoids these additional expenses, resulting in significant economic benefits for long-term pyrolysis furnace systems.

[0009] In some embodiments of this application, the evaporation system includes a first evaporation system and a second evaporation system, wherein the first evaporation system is connected between the second evaporation system and the pyrolysis furnace; the gas generated by heating the pyrolysis furnace is suitable to be heated by the first evaporation system and then flow into the second evaporation system, thereby heating the second evaporation system.

[0010] In some embodiments of this application, a heat exchange device is also included, wherein a first heat exchange channel and a second heat exchange channel are provided in the heat exchange device to perform heat exchange; the first heat exchange channel is adapted to connect external gas with the heating system to supply oxygen to the heating system; one end of the second heat exchange channel is connected to a second evaporation system and is adapted to allow the flow of exhaust gas heated by the second evaporation system.

[0011] In some embodiments of this application, the first evaporation system includes: evaporation fins and an evaporation spiral device connected together, the evaporation fins being adapted to exchange heat with the exhaust gas to heat the evaporation spiral device, and the evaporation spiral device being adapted to evaporate the material.

[0012] In some embodiments of this application, the evaporation fins are made of a corrosion-resistant and thermally conductive material.

[0013] In some embodiments of this application, an exhaust gas treatment system is also included, which is connected to the other end of the second heat exchange channel and is used to purify the exhaust gas flowing into the second heat exchange channel.

[0014] In some embodiments of this application, the heating system includes a gas burner for heating the heating system.

[0015] In some embodiments of this application, a first tail gas filtration device is also included, which is connected between the heating system and the pyrolysis furnace. The first tail gas filtration device is used to filter volatile gases and dust generated by material volatilization, and the filtered tail gas can flow into the pyrolysis furnace to assist combustion of the gas burner.

[0016] In some embodiments of this application, an eccentric spiral device for material transfer is provided between the pyrolysis furnace and the volatilization system, and the eccentric spiral device is equipped with a universal joint.

[0017] In some embodiments of this application, the pyrolysis furnace is a pyrolysis master furnace. Attached Figure Description

[0018] The accompanying drawings are used to provide a further understanding of the technical solutions of this application and constitute a part of the specification. They are used together with the embodiments of this application to explain the technical solutions of this application and do not constitute a limitation on the technical solutions of this application.

[0019] Figure 1 This is a schematic diagram of a waste heat utilization device for a pyrolysis furnace provided in an embodiment of this application. Detailed Implementation

[0020] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0021] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0022] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0023] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "connected" and "linked" should be interpreted broadly, for example, as a fixed connection, a detachable connection, or an integral connection. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances. Furthermore, when describing pipelines, the terms "connected" and "linked" as used in this application have the meaning of establishing electrical connection. The specific meaning needs to be understood in conjunction with the context.

[0024] In the embodiments of this application, the terms "exemplary" or "for example" are used to indicate that something is an example, illustration, or description. Any embodiment or design that is described as "exemplary" or "for example" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or design. Specifically, the use of the terms "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0025] In many fields such as chemical engineering and energy, pyrolysis technology is an important material processing method, widely used to break down macromolecules into smaller molecules to obtain higher-value products or meet specific production needs. The pyrolysis process typically requires a high-temperature environment. Traditional pyrolysis units generally use separate heating systems to provide heat to the pyrolysis furnace and the volatilization system, which not only leads to complex equipment structures but also increases manufacturing and operating costs.

[0026] Based on this Figure 1 This application provides a schematic diagram of the structure of a pyrolysis furnace waste heat utilization device according to an embodiment of the present application. Figure 1 As shown, the waste heat utilization device 100 of the pyrolysis furnace includes: a pyrolysis furnace 11, a heating system 12 and a volatilization system 13. The pyrolysis furnace 11 is suitable for pyrolyzing materials.

[0027] The heating system 12 is connected to the pyrolysis furnace 11 and is adapted to heat the pyrolysis furnace 11 and generate exhaust gas with heat. The volatilization system 13 is connected to the pyrolysis furnace 11 and the exhaust gas generated by the heating system 12 to heat the pyrolysis furnace 11 is adapted to flow into the volatilization system 13 to heat the volatilization system 13. The volatilization system 13 is adapted to volatilize the material.

[0028] Optionally, the waste heat utilization device 100 of the pyrolysis furnace also includes a first exhaust pipe 14, which is connected between the pyrolysis furnace 11 and the volatilization system 13. The first exhaust pipe 14 is adapted to allow exhaust gas to pass through, so that the pyrolysis furnace 11 is heated and generates exhaust gas with heat, which enters the volatilization system 13 through the first exhaust pipe 14.

[0029] Optionally, in some embodiments, a first exhaust port 111 is provided above the pyrolysis furnace 11, and one end of the first exhaust pipe 14 is connected to the first exhaust port 111. In this way, the exhaust gas in the pyrolysis furnace 11 can flow from the first exhaust port 111 above into the first exhaust pipe 14, and then flow into the volatilization system 13.

[0030] This embodiment of the application introduces the exhaust gas generated by the heating system 12 heating the pyrolysis furnace 11 into the volatilization system 13, thereby achieving effective utilization of the exhaust gas heat. Traditional pyrolysis equipment often directly discharges or simply treats this exhaust gas before discharging it, resulting in a large amount of energy waste. However, the pyrolysis furnace waste heat utilization device 100 provided in this embodiment of the application uses the heat carried in the exhaust gas to heat the volatilization system 13, so that the heat that might otherwise be wasted is reused, improving the energy utilization efficiency of the entire system.

[0031] This waste heat utilization method reduces the need for additional energy. For example, without this waste heat utilization, the evaporation system 13 might require a separate heating device (such as electric heating or other fuel heating), which would consume more electricity or fuel. This device can provide the required heat for the evaporation system 13 by utilizing the heat from the exhaust gas, thereby saving energy costs.

[0032] Furthermore, reducing reliance on additional heating devices lowers equipment operating costs. Since installing additional heating devices involves costs related to equipment purchase, installation, maintenance, and energy consumption, utilizing waste heat from the exhaust gas avoids these additional expenses, resulting in significant economic benefits for long-term pyrolysis furnace systems.

[0033] In some embodiments of this application, the heating system 12 includes a gas burner 121 for heating the heating system 12.

[0034] Optionally, multiple gas burners 121 may be provided, for example, such as Figure 1 As shown, the gas burner 121 can be provided with 5 units, or it can be provided with 4, 3, or 6 units, etc., and this application does not limit this. In this way, the heating performance of the heating system 12 can be improved.

[0035] Because the gas burner 121 can efficiently convert the chemical energy of gas into thermal energy. Taking common natural gas as an example, its main component, methane, mixes thoroughly with air and burns in the burner, releasing a large amount of heat. Compared with some other traditional heating methods, such as electric heating, in large-scale heating scenarios, it can generate a large amount of heat with lower energy input, quickly raising the temperature of the heating system 12, providing sufficient heat for the pyrolysis furnace 11 and the volatilization system 13, and meeting the high-temperature environment requirements of the cracking process.

[0036] In some embodiments of this application, the evaporation system 13 includes a first evaporation system 131 and a second evaporation system 132. The first evaporation system 131 is connected between the second evaporation system 132 and the pyrolysis furnace 11. The gas generated by the heating of the pyrolysis furnace 11 is suitable to be heated by the first evaporation system 131 and then flows into the second evaporation system 132, thereby heating the second evaporation system 132.

[0037] Thus, the gas generated by the pyrolysis furnace 11 first passes through the first volatilization system 131, transferring heat to the first volatilization system 131 for heating, achieving the initial utilization of heat. Afterwards, this gas, having undergone partial heat exchange, flows into the second volatilization system 132 to heat the second volatilization system 132, achieving the secondary utilization of heat. This stepped heat utilization method fully utilizes the waste heat of the gas generated by the pyrolysis furnace 11, avoids heat waste, and improves the energy efficiency of the entire system.

[0038] In some embodiments of this application, the operating temperature of the first evaporation system 131 is higher than that of the second evaporation system 132.

[0039] In this way, the first evaporation system 131 can utilize the exhaust gas at a higher temperature, while the second evaporation system 132 utilizes the exhaust gas after it has been cooled by the first evaporation system 131. This allows for full utilization of heat at different temperature levels, making energy utilization more rational and efficient, and maximizing the exploitation of the usable energy in the gas produced by the pyrolysis furnace 11.

[0040] Furthermore, the volatilization temperatures of the first volatilization system 131 and the second volatilization system 132 are different. Therefore, in the first volatilization system 131, the material undergoes initial volatilization at a relatively high temperature, and some more volatile components will precipitate out of the material first. Afterward, the material enters the second volatilization system 132 and volatilizes further at a lower temperature, so that components with different volatilization points in the material can volatilize in the most suitable temperature environment, thereby improving the volatilization efficiency and the thoroughness of volatilization.

[0041] In order to ensure that the temperature of the exhaust gas flowing into the first volatilization system 131 can be heated to the target temperature by the first volatilization system 131, in some embodiments, the waste heat utilization device 100 of the pyrolysis furnace may also include a secondary combustion chamber 15 for exhaust gas, and the other end of the first exhaust pipe 14 is connected to the secondary combustion chamber 15 for exhaust gas.

[0042] Optionally, the waste heat utilization device 100 of the pyrolysis furnace may further include a heating device 16 disposed in the secondary combustion chamber 15 of the exhaust gas. The heating device 16 is adapted to heat the exhaust gas to increase the temperature of the exhaust gas flowing into the first volatilization system 131. For example, the heating device 16 may be a gas burner 121.

[0043] The exhaust gas secondary combustion chamber 15 is provided with a second exhaust port 151, which is connected to the first evaporation system 131.

[0044] In this way, the heating device 16 inside the exhaust gas secondary combustion chamber 15 can further increase the temperature of the exhaust gas originally discharged from the pyrolysis furnace 11. As a result, when this high-temperature exhaust gas flows into the first volatilization system 131, it carries more heat, allowing the first volatilization system 131 to absorb heat more effectively, thereby providing more sufficient energy for the subsequent second volatilization system 132. This helps to make fuller use of the thermal energy in the exhaust gas and improves the energy recovery and utilization efficiency of the entire system.

[0045] In some embodiments of this application, the first evaporation system 131 includes evaporation fins 1311 and evaporation spiral device 1312 connected to each other. The evaporation fins 1311 are adapted to exchange heat with the exhaust gas to heat the evaporation spiral device 1312, and the evaporation spiral device 1312 is adapted to evaporate the material.

[0046] Because the evaporation fins 1311 are typically designed with a large surface area, such as being curved, wavy, or other complex shapes, this design allows for greater contact between the exhaust gas and the fins as it flows through them. This significantly increases the heat exchange efficiency between the exhaust gas and the evaporation fins 1311. Through this ample contact with the exhaust gas, the evaporation fins 1311 can rapidly absorb heat from the exhaust gas, achieving highly efficient heat transfer and effectively converting the thermal energy in the exhaust gas into usable thermal energy.

[0047] In addition, the evaporation spiral device 1312 can stir and convey the material, causing it to continuously tumble and move within the device. When the evaporation fins 1311 transfer heat to the evaporation spiral device 1312, the material can be uniformly heated within the device due to the rotational motion of the spiral device. This avoids localized overheating or undercooling of the material, ensuring that the volatile components in the material volatilize stably at a suitable temperature, thus improving the uniformity and stability of the volatilization process.

[0048] Optionally, the evaporation fin 1311 may be made of a corrosion-resistant and thermally conductive material. For example, the material of the evaporation fin 1311 may be copper alloy, stainless steel, nickel alloy, or aluminum alloy, etc. This application does not limit this.

[0049] Thus, when the exhaust gas carrying heat flows through the volatilization fins 1311, the heat can be quickly conducted through the fins to the volatilization spiral device 1312, achieving rapid heat transfer. This ensures that the material can obtain sufficient heat in a timely manner, accelerates the volatilization process, and improves the working efficiency of the entire volatilization system 13.

[0050] Furthermore, during the waste heat utilization process of the pyrolysis furnace, the exhaust gas has a complex composition and may contain acidic gases (such as sulfur dioxide, hydrogen chloride, etc.), alkaline substances, or other corrosive components. Corrosion-resistant materials can effectively resist the erosion of these corrosive substances, prevent the fins from being corroded and damaged, and extend the service life of the volatile fins 1311.

[0051] In addition, in some embodiments, the first evaporation system 131 further includes a third exhaust port 1313, which is connected to the second evaporation system 132, so that the exhaust gas in the first evaporation system 131 can flow into the second evaporation system 132 through the third exhaust port 1313.

[0052] In some embodiments of this application, the second evaporation system 132 includes a first fin 1321 connected to an evaporation conveying system 1322. For example, the evaporation conveying system 1322 may also be the evaporation spiral device 1312 described above, and this application does not limit it in this way.

[0053] Since the exhaust gas still carries some energy after passing through the first evaporation system 131, the first fin 1321, with its large heat exchange area, makes full contact with the exhaust gas, efficiently capturing this residual heat. Subsequently, thanks to its excellent thermal conductivity, the first fin 1321 quickly transfers heat to the connected evaporation conveying system 1322, raising the internal temperature of the evaporation conveying system 1322 to a temperature suitable for the low-temperature evaporation of the material. This achieves a second utilization of the exhaust gas's heat, significantly improving energy efficiency and reducing energy waste.

[0054] In some embodiments of this application, the waste heat utilization device 100 of the pyrolysis furnace further includes a heat exchange device 17, which is provided with a first heat exchange channel 171 and a second heat exchange channel 172 capable of heat exchange.

[0055] The first heat exchange channel 171 is adapted to connect the external gas with the heating system 12 to supply oxygen to the heating system 12; one end of the second heat exchange channel 172 is connected to the second evaporation system 132 and is adapted to allow the exhaust gas heated by the second evaporation system 132 to circulate.

[0056] Specifically, the second evaporation system 132 may be provided with a fourth exhaust port 1323, and the first exhaust port 111 is connected to the second heat exchange channel 172 so that the exhaust gas flowing out of the second evaporation system 132 can flow through the second heat exchange channel 172.

[0057] In addition, the heat exchange device 17 also includes a first air inlet 173 and a first air outlet 174 connected to the first heat exchange channel 171, a second air inlet 175 and a second air outlet 176 connected to the second heat exchange channel 172. The first air inlet 173 is adapted to communicate with the outside air, the first air outlet 174 is connected to the gas burner 121, and the second air inlet 175 is connected to the fourth exhaust port 1323.

[0058] Thus, before the external gas is introduced into the heating system 12 through the first heat exchange channel 171, it exchanges heat with the exhaust gas flowing out of the second evaporation system 132 in the heat exchange device 17. The residual heat of the exhaust gas is transferred to the external gas, preheating the air entering the heating system 12. The preheated air can improve the combustion efficiency of the fuel in the heating system 12, which not only helps to reduce fuel consumption and lower energy costs, but also improves the overall heating capacity of the heating system 12, meeting the heat requirements of the pyrolysis furnace 11 and the evaporation system 13.

[0059] In addition, in some embodiments, the waste heat utilization device 100 of the pyrolysis furnace may also include a second pipeline 18 and a first induced draft fan 19 disposed on the second pipeline 18, the second pipeline 18 being connected between the first gas outlet 174 and the gas burner 121.

[0060] Thus, by setting up the second pipeline 18 and the first induced draft fan 19, the gas from the first outlet 174 can be introduced into the gas burner 121. This gas, carrying residual heat, can participate in the combustion process as part of the combustion air. Since the gas itself has a certain temperature, it can increase the initial temperature of the combustion zone, making the gas combustion more complete, thereby improving energy utilization efficiency.

[0061] In some embodiments of this application, the pyrolysis furnace waste heat utilization device 100 further includes a tail gas treatment system 20, which is connected to the other end of the second heat exchange channel 172 and is used to purify the tail gas flowing into the second heat exchange channel 172.

[0062] Specifically, the exhaust gas treatment system 20 can be connected to the second outlet 176. Then, the exhaust gas passing through the second heat exchange channel 172 and the second outlet 176 can flow into the exhaust gas treatment system 20 to treat the exhaust gas.

[0063] Optionally, the exhaust gas treatment system 20 includes a spray tower 201 and a carbon filter 202. The spray tower 201 is adapted to spray the incoming gas to reduce dust, and the carbon filter 202 is adapted to further adsorb the dust-reduced gas before discharge.

[0064] In order to increase the airflow velocity within the exhaust gas treatment system 20, in some embodiments the exhaust gas treatment system 20 further includes a second induced draft fan 203 adapted to exhaust the exhaust gas from the exhaust gas treatment system 20.

[0065] It is understandable that the exhaust gas passing through the second heat exchange channel 172, although having undergone some waste heat utilization, may still contain various pollutants, such as particulate matter, sulfur dioxide, nitrogen oxides, and volatile organic compounds (VOCs). This embodiment of the application, by setting up an exhaust gas treatment system 20, can specifically treat these pollutants. Through technologies such as filtration, adsorption, and catalytic reactions, the content of pollutants in the exhaust gas is effectively reduced, ensuring it meets environmental emission standards before being released into the atmosphere, thereby significantly reducing air pollution.

[0066] In some embodiments, the pyrolysis furnace waste heat utilization device 100 further includes a first closed-air discharge device 21 and a second closed-air discharge device 22. The first closed-air discharge device 21 is connected to the feed inlet of the second volatilization system 132, and the second closed-air discharge device 22 is connected to the discharge outlet of the second volatilization system 132 and the feed inlet of the first volatilization system 131.

[0067] It should be noted that the main function of the closed-loop discharge device is to ensure the system's airtightness when materials enter and exit the system. In the pyrolysis furnace waste heat utilization device 100, the first closed-loop discharge device 21 ensures that outside air does not enter the system when materials enter the second volatilization system 132. Similarly, the second closed-loop discharge device 22 can also prevent gas leakage within the system and maintain the stability of specific environments (such as temperature, pressure, and gas composition) within the system when materials exit from the second volatilization system 132 and enter the first volatilization system 131.

[0068] In some embodiments, an eccentric spiral device for material transfer is provided between the pyrolysis furnace 11 and the volatilization system 13, and the eccentric spiral device is equipped with a universal joint. Specifically, the eccentric spiral device is disposed within the first volatilization system 131, and the eccentric spiral device is oriented towards the pyrolysis furnace 11.

[0069] Thus, the eccentric screw device, through rotation and the pushing action of the screw blades, can efficiently transport materials from the first volatilization system 131 to the pyrolysis furnace 11. Compared with ordinary screw devices, the eccentric design causes a certain degree of disturbance to the material during transportation, avoiding problems such as compaction and blockage, and ensuring the stability and continuity of material transmission. Furthermore, by installing a universal joint on the eccentric screw, a small-amplitude oscillation can be achieved, thereby effectively avoiding material jamming and reducing the torque burden on the screw.

[0070] In some embodiments of this application, the pyrolysis furnace 11 is a pyrolysis mother-daughter furnace, which includes a middle daughter furnace and an outer mother furnace. The daughter furnace and the mother furnace are respectively provided with spiral blades, and the spiral blades are driven in opposite directions. This allows materials to enter and exit in the same direction, while also achieving secondary utilization of heat, thereby fully pyrolyzing the materials at high temperature.

[0071] In some embodiments of this application, the waste heat utilization device 100 of the pyrolysis furnace further includes a material cooling device 23, a third closed-ventilation discharge device 24, and a fourth closed-ventilation discharge device 25. The third closed-ventilation discharge device 24 is connected between the material cooling device 23 and the pyrolysis mother and daughter furnaces, and the fourth closed-ventilation discharge device 25 is connected to the discharge port of the material cooling device 23. Exemplarily, the material cooling device 23 can be a structure such as a water jacket, and this application does not limit it to this.

[0072] Thus, the material cooling device 23 can cool the high-temperature material processed by the pyrolysis furnace to a suitable temperature, facilitating subsequent storage, transportation, or further processing. The third closed-loop discharge device 24 connects the material cooling device 23 and the pyrolysis furnace, ensuring the airtightness of the entire system as material exits the furnace and enters the cooling device 23. The fourth closed-loop discharge device 25 connects to the discharge port of the cooling device 23, ensuring the smooth discharge of cooled material while maintaining the airtightness of the cooling device 23.

[0073] In some embodiments of this application, the waste heat utilization device 100 of the pyrolysis furnace further includes a first tail gas filter 26 connected between the heating system 12 and the pyrolysis furnace 11. The first tail gas filter 26 is used to filter the volatile gases and dust generated by the volatilization of materials, and the filtered tail gas can flow into the pyrolysis furnace 11 to assist the combustion of the gas burner 121.

[0074] Thus, the first tail gas filtration device 26 can effectively filter volatile gases and dust generated by material volatilization. For dust, it can prevent solid particles from entering the subsequent heating system 12 and pyrolysis furnace 11, avoiding these particles from causing wear, blockage and corrosion to the equipment.

[0075] Furthermore, the filtered exhaust gas flows into the pyrolysis furnace 11 and assists the combustion of the gas burner 121, which is an effective utilization of exhaust gas resources. By utilizing the remaining combustible components in the exhaust gas, such as carbon monoxide and hydrogen, the combustion efficiency of the gas burner 121 can be improved. This not only reduces the use of additional fuel and lowers energy costs, but also makes full use of the chemical energy in the exhaust gas, improving the energy efficiency of the entire system.

[0076] In some embodiments, the pyrolysis furnace waste heat utilization device 100 further includes a third pipeline 27 and a third induced draft fan 28. The third induced draft fan 28 is connected between the first exhaust gas filter device 26 and one end of the third pipeline 27. The third induced draft fan 28 is adapted to introduce the exhaust gas in the first exhaust gas filter device 26 into the third pipeline 27. The other end of the third pipeline 27 is connected to the gas burner 121 of the heating system 12.

[0077] In this way, the third induced draft fan 28 can provide power to effectively introduce the filtered exhaust gas in the first exhaust gas filter device 26 into the third pipeline 27, ensuring that the exhaust gas can flow stably into the gas burner 121 through the third pipeline 27 according to the set requirements.

[0078] Similarly, the waste heat utilization device 100 of the pyrolysis furnace may also include a fifth closed-loop discharge device 29 connected between the inlet of the first tail gas filter device 26 and the pyrolysis furnace 11. The fifth closed-loop discharge device 29 ensures that the material is discharged from the pyrolysis furnace 11 in a relatively sealed environment, avoiding material leakage from harming the working environment and operators, while also ensuring accurate handling and recycling of the material.

[0079] It should be noted that the exhaust gas and dust generated by the pyrolysis of materials in the pyrolysis mother furnace pass through the first exhaust gas filter device 26. The dust falls back through the fifth closed-loop discharge device. The exhaust gas is charged into the gas burner 121 for combustion and purification by the third induced draft fan 28 through the third pipeline 27 under positive and negative pressure. The purified exhaust gas then passes through the pyrolysis furnace 11, the first volatilization system 131, the second volatilization system 132 and the heat exchange device 17, and is purified and discharged after multiple waste heat utilization processes.

[0080] Similarly, the waste heat utilization device 100 of the pyrolysis furnace also includes a second tail gas filter 30 connected between the first volatilization system 131 and the pyrolysis furnace 11. The second tail gas filter 30 is used to filter the volatile gases and dust generated by the volatilization of materials, and the filtered tail gas can flow into the pyrolysis furnace 11 to assist the combustion of the gas burner 121.

[0081] Optionally, the waste heat utilization device 100 of the pyrolysis furnace further includes a fourth induced draft fan 31, which is connected between the second exhaust gas filter device 30 and one end of the third pipeline 27. The fourth induced draft fan 28 is adapted to introduce the exhaust gas in the second exhaust gas filter device 30 into the third pipeline 27, and the other end of the third pipeline 27 is connected to the gas burner 121 of the heating system 12.

[0082] Thus, the fourth induced draft fan 31 can provide power to effectively introduce the filtered exhaust gas in the second exhaust gas filter device 30 into the third pipeline 27, ensuring that the exhaust gas can flow stably into the gas burner 121 through the third pipeline 27 according to the set requirements.

[0083] In addition, the waste heat recovery device 100 of the pyrolysis furnace may also include a sixth closed-loop discharge device 32 connected between the inlet of the second tail gas filter device 30 and the first volatilization system 131. The sixth closed-loop discharge device 32 ensures that the material is discharged from the first volatilization system 131 in a relatively sealed environment, avoiding material leakage that could harm the working environment and operators, while also ensuring the accurate handling and recovery of the material.

[0084] It should be noted that the volatile gases and dust generated during the material transport in the first volatile system 131 are drawn in by the second tail gas filter 30. The dust is collected after being filtered by the filter bag of the second tail gas filter 30 and then falls off during the pulse vibration of the airflow, falling back into the first volatile system 131 from the fifth closed-loop discharge device 29. The volatile exhaust gas discharged from the second tail gas filter 30 is drawn out by the fourth induced draft fan 31 under negative pressure and fed into the gas burner through the third pipeline 27 as auxiliary combustion gas for purification.

[0085] In understanding the scope of this application, the term "comprising" and its derivatives, as used herein, are intended to be open-ended terms that specify the presence of a described feature, element, component, group, whole, and / or step, but do not exclude the presence of other undescribed features, elements, components, groups, wholes, and / or steps. This concept also applies to words with similar meanings, such as the terms "comprising," "having," and their derivatives.

[0086] The term "attached" or "joined" as used herein includes: a construction in which one element is directly fixed to another element by fixing it directly to another element; a construction in which one element is indirectly fixed to another element by fixing it to an intermediate member, which in turn is fixed to another element; and a construction in which one element is integral with another element, that is, one element is substantially part of another element. This definition also applies to words with similar meanings, such as "connect," "joint," "couple," "install," "adhere," "fix," and their derivatives. Finally, degree terms such as "substantially," "approximately," and "approximately" as used herein indicate the amount of deviation from which modifications to the terminology do not significantly alter the final result.

[0087] Unless otherwise defined, the technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for descriptive purposes only and is not intended to limit the scope of this application. Features described in one embodiment may be applied, alone or in combination with other features, to another embodiment, unless that feature is not applicable in that other embodiment or is otherwise stated.

[0088] The application has been described through the above embodiments; however, it should be understood that the above embodiments are for illustrative purposes only and are not intended to limit the application to the described embodiments. Furthermore, those skilled in the art will understand that the application is not limited to the above embodiments, and many more variations and modifications can be made based on the teachings of this application, all of which fall within the scope of protection claimed in this application.

Claims

1. A cracking furnace waste heat utilization device, characterized by, The application relates to a pyrolysis device, which comprises: a pyrolysis furnace suitable for pyrolyzing materials; a heating system connected with the pyrolysis furnace, suitable for heating the pyrolysis furnace and generating tail gas with heat; a volatilization system in communication with the pyrolysis furnace, wherein the tail gas generated by heating the pyrolysis furnace by the heating system is suitable for flowing into the volatilization system to heat the volatilization system, and the volatilization system is suitable for volatilizing the materials; the volatilization system comprises a first volatilization system and a second volatilization system, the first volatilization system is in communication between the second volatilization system and the pyrolysis furnace; the gas generated by heating the pyrolysis furnace is suitable for flowing into the second volatilization system after being heated by the first volatilization system, and the second volatilization system is heated; the first volatilization system comprises volatilization fins and volatilization spiral devices connected with each other, the volatilization fins are suitable for exchanging heat with the tail gas to heat the volatilization spiral devices, and the volatilization spiral devices are suitable for volatilizing the materials.

2. The cracking furnace waste heat utilization device according to claim 1, characterized in that, a heat exchange device is further included, and the heat exchange device is provided with a first heat exchange channel and a second heat exchange channel capable of exchanging heat; the first heat exchange channel is suitable for communicating with external gas and the heating system to supply oxygen to the heating system; one end of the second heat exchange channel is in communication with the second volatilization system and is suitable for flowing through the tail gas heated by the second volatilization system.

3. The cracking furnace waste heat utilization device according to claim 1, characterized in that, The volatilization fins are made of corrosion-resistant and heat-conducting materials.

4. The cracking furnace waste heat utilization device according to claim 2, characterized in that, a tail gas treatment system in communication with the other end of the second heat exchange channel is further included, and the tail gas treatment system is used for purifying the tail gas flowing into the second heat exchange channel.

5. The cracking furnace waste heat utilization device according to claim 1, characterized in that, the heating system comprises a gas combustion machine used for heating the heating system.

6. The cracking furnace waste heat utilization device according to claim 5, characterized in that, a first tail gas filtering device in communication between the heating system and the pyrolysis furnace is further included, the first tail gas filtering device is used for filtering volatilization gas and dust materials generated by volatilizing the materials, and the filtered tail gas can flow into the pyrolysis furnace to assist combustion of the gas combustion machine.

7. The cracking furnace waste heat utilization device according to claim 1, characterized in that, an eccentric spiral device for material transmission is arranged between the pyrolysis furnace and the volatilization system, and the eccentric spiral device is provided with a universal joint.

8. The cracking furnace waste heat utilization device according to claim 1, characterized in that, the pyrolysis furnace is a pyrolysis sub-furnace.

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