Cracking furnace waste heat utilization device
By designing a waste heat utilization device in the cracking furnace and introducing the exhaust heat into the volatile system, the problems of high production costs and complex structure of the cracking furnace are solved, and the energy utilization efficiency and operating costs are improved.
Patent Information
- Application Number
- CN202510153875.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Priority Date
- 2025-02-07
- Filing Date
- 2025-02-12
- Publication Date
- 2025-03-21
AI Technical Summary
The production cost of cracking furnaces is relatively high, the structure is complex, and the installation and maintenance are difficult.
A waste heat utilization device for cracking furnace is designed to effectively utilize exhaust gas by introducing the exhaust gas generated by the heating system into the volatile system. The device includes a pyrolysis furnace, a heating system and a volatile system. The heating system is connected to the pyrolysis furnace. The exhaust gas flows into the volatile system for heating. The volatile system is used to volatilize the material.
By using the heat in the exhaust gas to heat the volatile system, the energy utilization efficiency of the entire system is improved, the demand for additional energy is reduced, and the operating cost of the equipment is reduced.
Smart Images
Figure CN119665667A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of cracking furnaces, and in particular to a device for utilizing waste heat from a cracking furnace. Background Art
[0002] In fields such as chemical production, the cracking process is an important technological link in decomposing macromolecules into small molecules, and is widely used in resource recovery, petrochemicals, coal chemical industry and other industries.
[0003] The cracking furnace in the related art usually includes a pyrolysis furnace and a volatilization system, and the pyrolysis furnace and the volatilization system are both equipped with independent heating devices to meet their respective temperature requirements. This will undoubtedly increase the production cost of the equipment, and also make the equipment structure complicated, and increase the difficulty of installation and maintenance. Summary of the invention
[0004] The present application provides a cracking furnace waste heat utilization device, which is used to solve the technical problems of high production cost, complex structure and difficult installation and maintenance of the cracking furnace.
[0005] Based on this, the present application provides a cracking furnace waste heat utilization device, including: 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, suitable for heating the pyrolysis furnace and generating tail gas with heat; the volatilization system is connected to the pyrolysis furnace through a first exhaust pipe, the tail gas generated by the heating system heating the pyrolysis furnace is suitable for flowing into the volatilization system to heat the volatilization system, and the volatilization system is suitable for volatilizing the materials.
[0006] By introducing the tail gas generated by the heating system of the pyrolysis furnace into the volatilization system, the heat of the tail gas is effectively utilized. Traditional cracking equipment often discharges this part of the tail gas directly or after simple treatment, resulting in a large amount of energy waste. The cracking furnace waste heat utilization device provided in the embodiment of the present application utilizes the heat carried in the tail gas to heat the volatilization system, so that the heat that might have been discarded is reused for a second time, thereby improving the energy utilization efficiency of the entire system.
[0007] This waste heat utilization method reduces the demand for additional energy. For example, without this waste heat utilization, the volatilization system may require a separate heating device (such as electric heating or other fuel heating), which will consume more electricity or fuel. However, this device can use the exhaust gas heat to provide the required heat for the volatilization system, thereby saving energy costs.
[0008] In addition, the operating cost of the equipment is reduced by reducing the reliance on additional heating devices. Since the additional installation of heating devices involves the purchase, installation, maintenance and energy consumption of equipment, the use of waste heat from tail gas avoids these additional costs, which has significant economic benefits for long-term operation of the cracking furnace system.
[0009] In some embodiments of the present application, the volatilization system includes a first volatilization system and a second volatilization system, and the first volatilization system is connected between the second volatilization system and the pyrolysis furnace; the gas generated by heating in the pyrolysis furnace is suitable for flowing into the second volatilization system after being heated by the first volatilization system, and heating the second volatilization system.
[0010] In some embodiments of the present application, a heat exchange device is further included, in which a first heat exchange channel and a second heat exchange channel capable of heat exchange are arranged; the first heat exchange channel is suitable for connecting external gas with the heating system to supply oxygen to the heating system; one end of the second heat exchange channel is connected to the second volatilization system, and is suitable for circulating the exhaust gas heated by the second volatilization system.
[0011] In some embodiments of the present application, the first volatilization system includes: volatilization fins and volatilization spiral devices connected to each other, the volatilization fins are suitable for exchanging heat with the exhaust gas to heat the volatilization spiral device, and the volatilization spiral device is suitable for volatilizing the logistics.
[0012] In some embodiments of the present application, the volatilization fins are made of corrosion-resistant heat-conductive material.
[0013] In some embodiments of the present application, an exhaust gas treatment system is further 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 the present application, the heating system includes a gas burner, and the gas burner is used to heat the heating system.
[0015] In some embodiments of the present application, a first exhaust gas filter device connected between the heating system and the pyrolysis furnace is also included. The first exhaust gas filter device is used to filter volatile gases and dust materials generated by volatilization of materials, and the filtered exhaust gas can flow into the pyrolysis furnace to assist combustion of the gas burner.
[0016] In some embodiments of the present application, an eccentric screw device for material transmission is provided between the pyrolysis furnace and the volatilization system, and the eccentric screw device is installed with a universal joint.
[0017] In some embodiments of the present application, the pyrolysis furnace is a pyrolysis mother-child furnace. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] The accompanying drawings are used to provide a further understanding of the technical solution of the present invention and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the technical solution of the present invention and do not constitute a limitation on the technical solution of the present invention.
[0019] Figure 1 A schematic structural diagram of a cracking furnace waste heat utilization device provided in an embodiment of the present application. DETAILED DESCRIPTION
[0020] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.
[0021] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.
[0022] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.
[0023] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances. In addition, when describing a pipeline, the "connected" and "connection" used in this application have the meaning of conduction. The specific meaning needs to be understood in conjunction with the context.
[0024] In the embodiments of the present application, words such as "exemplary" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary" or "for example" is intended to present related concepts in a specific way.
[0025] In many fields such as chemical industry and energy, cracking technology is an important material processing method, which is widely used to decompose macromolecular substances into small molecular substances to obtain products with higher value or meet specific production needs. The cracking process usually needs to be carried out in a high temperature environment. Traditional cracking devices generally use independent heating systems to provide heat for the pyrolysis furnace and volatilization system respectively. This method not only makes the equipment structure complex, but also increases the manufacturing cost and operating cost of the equipment.
[0026] Based on this, Figure 1 The schematic diagram of the structure of a cracking furnace waste heat utilization device provided in the embodiment of the present application is shown as follows: Figure 1 As shown, the cracking furnace waste heat utilization device 100 includes: a pyrolysis furnace 11, a heat supply system 12 and a volatilization system 13, and the pyrolysis furnace 11 is suitable for pyrolysis of materials.
[0027] Among them, the heating system 12 is connected to the pyrolysis furnace 11, and the heating system 12 is suitable for heating the pyrolysis furnace 11 and generating 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 heating the pyrolysis furnace 11 is suitable for flowing into the volatilization system 13 to heat the volatilization system 13, and the volatilization system 13 is suitable for volatilizing the material.
[0028] Optionally, the cracking furnace waste heat utilization device 100 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 suitable for passing tail gas, so that the pyrolysis furnace 11 is heated and generates tail 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, so that the exhaust gas in the pyrolysis furnace 11 can flow into the first exhaust pipe 14 from the first exhaust port 111 above, and then flow into the volatilization system 13.
[0030] The embodiment of the present application achieves effective utilization of the heat of the tail gas by introducing the tail gas generated by the heating system 12 heating the pyrolysis furnace 11 into the volatilization system 13. Traditional cracking equipment often discharges this part of the tail gas directly or after simple treatment, resulting in a large amount of energy waste. The cracking furnace waste heat utilization device 100 provided in the embodiment of the present application utilizes the heat carried in the tail gas to heat the volatilization system 13, so that the heat that might have been discarded is reused for a second time, thereby improving the energy utilization efficiency of the entire system.
[0031] This waste heat utilization method reduces the demand for additional energy. For example, if there is no such waste heat utilization, the volatilization system 13 may require a separate heating device (such as electric heating or other fuel heating), which will consume more electricity or fuel. However, the present device utilizes the exhaust gas heat to provide the required heat for the volatilization system 13, thereby saving energy costs.
[0032] In addition, the operating cost of the equipment is reduced by reducing the reliance on additional heating devices. Since the additional installation of heating devices involves the purchase, installation, maintenance and energy consumption of equipment, the use of waste heat from tail gas avoids these additional costs, which has significant economic benefits for long-term operation of the cracking furnace system.
[0033] In some embodiments of the present application, the heating system 12 includes a gas burner 121 , and the gas burner 121 is used to heat the heating system 12 .
[0034] Optionally, the gas burner 121 may be provided with a plurality of, for example, Figure 1 As shown, the number of the gas burners 121 can be 5, or 4, 3 or 6, etc., which is not limited in the present application. In this way, the heating performance of the heating system 12 can be improved.
[0035] Since the gas burner 121 can efficiently convert the chemical energy of the gas into thermal energy. Taking common natural gas as an example, its main component methane is fully mixed with air and burned 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 energy with lower energy input, quickly increase the temperature of the heating system 12, and provide sufficient heat for the pyrolysis furnace 11 and the volatilization system 13 to meet the high temperature environment requirements of the cracking process.
[0036] In some embodiments of the present application, the volatilization system 13 includes a first volatilization system 131 and a second volatilization system 132. The first volatilization system 131 is connected between the second volatilization system 132 and the pyrolysis furnace 11. The gas generated by the pyrolysis furnace 11 is suitable for being heated by the first volatilization system 131 and then flowing into the second volatilization system 132, thereby heating the second volatilization system 132.
[0037] In this way, the gas generated by the pyrolysis furnace 11 first passes through the first volatilization system 131, transfers the heat to the first volatilization system 131 for heating, and realizes the first use of heat. Afterwards, the gas that has undergone partial heat exchange flows into the second volatilization system 132 again, heats the second volatilization system 132, and realizes the secondary use of heat. This step-by-step heat utilization method fully utilizes the waste heat of the gas generated by the pyrolysis furnace 11, avoids heat waste, and improves the energy utilization efficiency of the entire system.
[0038] In some embodiments of the present application, the operating temperature of the first volatilization system 131 is higher than the operating temperature of the second volatilization system 132 .
[0039] In this way, the first volatilization system 131 can utilize the tail gas with a higher temperature, while the second volatilization system 132 utilizes the tail gas cooled by the first volatilization system 131. This can fully utilize the heat at different temperature levels, making energy utilization more reasonable and sufficient, and maximally tapping the available energy in the gas generated by the pyrolysis furnace 11.
[0040] In addition, the volatilization temperatures of the first volatilization system 131 and the second volatilization system 132 are different. Therefore, the material is initially volatilized at a relatively high temperature in the first volatilization system 131, and some more volatile components will be precipitated from the material first; then, the material enters the second volatilization system 132 and further volatilizes at a lower temperature, so that components at different volatilization points in the material can volatilize under the most suitable temperature environment, thereby improving the volatilization efficiency and thoroughness of the material.
[0041] In order to ensure that the temperature of the tail 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 cracking furnace waste heat utilization device 100 may further include a tail gas secondary combustion chamber 15 , and the other end of the first exhaust pipe 14 is connected to the tail gas secondary combustion chamber 15 .
[0042] Optionally, the cracking furnace waste heat utilization device 100 may further include a heating device 16 disposed in the tail gas secondary combustion chamber 15, the heating device 16 being suitable for heating the tail gas to increase the temperature of the tail gas flowing into the first volatilization system 131. Exemplarily, the heating device 16 may be a gas burner 121.
[0043] The tail gas secondary combustion chamber 15 is provided with a second exhaust port 151 , and the second exhaust port 151 is communicated with the first volatilization system 131 .
[0044] In this way, the heating device 16 inside the exhaust secondary combustion chamber 15 can further increase the temperature of the exhaust gas originally discharged from the pyrolysis furnace 11, so that when these high-temperature exhaust gases flow into the first volatilization system 131, they carry more heat, so that the first volatilization system 131 can absorb heat more effectively, thereby providing more sufficient energy for the subsequent second volatilization system 132. This helps to make fuller use of the heat energy in the exhaust gas and improve the energy recovery and utilization efficiency of the entire system.
[0045] In some embodiments of the present application, the first volatilization system 131 includes a volatilization fin 1311 and a volatilization spiral device 1312 connected to each other. The volatilization fin 1311 is suitable for exchanging heat with the exhaust gas to heat the volatilization spiral device 1312. The volatilization spiral device 1312 is suitable for volatilizing materials.
[0046] Since the volatilization fins 1311 are usually designed to have a large surface area, such as a curved wave shape or other complex shapes, this design allows the exhaust gas to have more area in contact with the fins when it flows through the volatilization fins 1311, greatly increasing the heat exchange efficiency between the exhaust gas and the volatilization fins 1311. By fully contacting the exhaust gas, the volatilization fins 1311 can quickly absorb the heat in the exhaust gas, achieve efficient heat transfer, and effectively convert the heat energy in the exhaust gas into usable heat energy.
[0047] In addition, the volatilization spiral device 1312 can stir and convey the material, so that the material is constantly turned and moved in the device. When the volatilization fins 1311 transfer heat to the volatilization spiral device 1312, the material can be evenly heated in the device due to the rotation of the spiral device. This can avoid local overheating or overcooling of the material, so that the volatile components in the material can be stably volatilized at a suitable temperature, thereby improving the uniformity and stability of the volatilization process.
[0048] Optionally, the volatile fin 1311 may be made of a corrosion-resistant heat-conductive material. Exemplarily, the material of the volatile fin 1311 may be a copper alloy, stainless steel, a nickel-containing alloy, or an aluminum alloy, etc., which is not limited in the present application.
[0049] In this way, when the exhaust gas carries heat and flows through the volatilization fins 1311, the heat can be quickly transferred through the fins to the volatilization spiral device 1312, thereby achieving rapid heat transfer. This ensures that the material can obtain sufficient heat in time, accelerates the volatilization process, and improves the working efficiency of the entire volatilization system 13. In addition, in the process of utilizing the waste heat of the cracking furnace, the tail gas composition is complex and may contain acidic gases (such as sulfur dioxide, hydrogen chloride, etc.), alkaline substances or other corrosive components. The corrosion-resistant material can effectively resist the erosion of these corrosive substances, prevent the fins from being corroded and damaged, and extend the service life of the volatilization fin 1311.
[0050] In addition, in some embodiments, the first volatilization system 131 further includes a third exhaust port 1313 , which is connected to the second volatilization system 132 , so that the exhaust gas in the first volatilization system 131 can flow into the second volatilization system 132 through the third exhaust port 1313 .
[0051] In some embodiments of the present application, the second volatilization system 132 includes a first fin 1321 and a volatilization delivery system 1322 connected to each other. Exemplarily, the volatilization delivery system 1322 may also be the volatilization spiral device 1312 described above, which is not limited in the present application.
[0052] Since the exhaust gas still carries a certain amount of energy after passing through the first volatilization system 131, the first fin 1321 fully contacts the exhaust gas through its large heat exchange area, and efficiently captures the waste heat. Subsequently, the first fin 1321, with its good thermal conductivity, quickly transfers the heat to the volatilization and transportation system 1322 connected thereto, so that the internal temperature of the volatilization and transportation system 1322 reaches a temperature that meets the low-temperature volatilization of the material, and the waste heat of the exhaust gas is utilized for the second time, which significantly improves the energy utilization efficiency and reduces energy waste.
[0053] In some embodiments of the present application, the cracking furnace waste heat utilization device 100 further includes a heat exchange device 17, in which a first heat exchange channel 171 and a second heat exchange channel 172 capable of performing heat exchange are arranged.
[0054] The first heat exchange channel 171 is suitable for connecting 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 volatilization system 132 and is suitable for circulating the exhaust gas heated by the second volatilization system 132 .
[0055] Specifically, the second volatilization system 132 may be provided with a fourth exhaust port 1323 , and the first exhaust port 111 is in communication with the second heat exchange channel 172 , so that the exhaust gas flowing out of the second volatilization system 132 can flow through the second heat exchange channel 172 .
[0056] 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, and 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 suitable for connecting with external 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.
[0057] In this way, before the external air is introduced into the heating system 12 through the first heat exchange channel 171, it is heat exchanged with the tail gas flowing out of the second volatilization system 132 in the heat exchange device 17. The remaining heat of the tail gas is transferred to the external air, so that the air entering the heating system 12 is preheated. 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 energy costs, but also improves the overall heating capacity of the heating system 12 and meets the heat requirements of the pyrolysis furnace 11 and the volatilization system 13.
[0058] In addition, in some embodiments, the cracking furnace waste heat utilization device 100 may further include a second pipeline 18 and a first induced draft fan 19 disposed on the second pipeline 18 , and the second pipeline 18 is connected between the first air outlet 174 and the gas burner 121 .
[0059] Thus, by providing the second pipeline 18 and the first induced draft fan 19, the gas from the first gas outlet 174 can be introduced into the gas burner 121, and the gas with residual heat can participate in the combustion process as a part of the combustion air. Since the gas itself has a certain temperature, it can increase the initial temperature of the combustion area, making the gas burn more fully, thereby improving the energy utilization efficiency. In some embodiments of the present application, the cracking 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 .
[0060] Specifically, the exhaust gas treatment system 20 may be in communication with the second gas outlet 176 , and then the exhaust gas passing through the second heat exchange channel 172 and the second gas outlet 176 may flow into the exhaust gas treatment system 20 to achieve exhaust gas treatment.
[0061] Optionally, the exhaust gas treatment system 20 includes a spray tower 201 and a carbon filter device 202. The spray tower 201 is suitable for spraying dust reduction on the inflowing gas, and the carbon filter device 202 is suitable for further adsorbing the dust-reduced gas and then discharging it.
[0062] In order to increase the air flow rate in the exhaust gas treatment system 20 , in some embodiments, the exhaust gas treatment system 20 further includes a second induced draft fan 203 , and the second induced draft fan 203 is suitable for exhausting the exhaust gas treatment system 20 .
[0063] It is understandable that the tail gas passing through the second heat exchange channel 172, although part of the waste heat has been utilized before, may still contain various pollutants, such as particulate matter, sulfur dioxide, nitrogen oxides, and volatile organic compounds (VOCs), etc. The embodiment of the present application can carry out targeted treatment of these pollutants by setting up the tail gas treatment system 20, and effectively reduce the content of pollutants in the tail gas through technical means such as filtration, adsorption, and catalytic reaction, so that it can meet the environmental emission standards before being discharged into the atmosphere, thereby significantly reducing the pollution to the air environment.
[0064] In some embodiments, the cracking furnace waste heat utilization device 100 also 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 port of the second volatilization system 132, and the second closed-air discharge device 22 is connected to the discharge port of the second volatilization system 132 and the feed port of the first volatilization system 131.
[0065] It should be noted that the main function of the air-tight discharging device is to ensure the sealing of the system when the material enters and leaves the system. In the cracking furnace waste heat utilization device 100, the first air-tight discharging device 21 ensures that when the material enters the second volatilization system 132, the outside air will not enter the system. Similarly, when the material is discharged from the second volatilization system 132 and enters the first volatilization system 131, the second air-tight discharging device 22 can also prevent the gas in the system from leaking and maintain the stability of the specific environment (such as temperature, pressure, gas composition, etc.) in the system.
[0066] In some embodiments, an eccentric screw device for material transmission is provided between the pyrolysis furnace 11 and the volatilization system 13 , and the eccentric screw device is installed with a universal joint. Specifically, the eccentric screw device is provided in the first volatilization system 131 , and the eccentric screw device is provided toward the pyrolysis furnace 11 .
[0067] In this way, the eccentric screw device can efficiently transport the material from the first volatilization system 131 to the pyrolysis furnace 11 by rotating and utilizing the driving force of the spiral blades. Compared with ordinary screw devices, the eccentric design causes a certain disturbance in the material during the transportation process, avoiding problems such as compaction and blockage of the material during the transportation process, and ensuring the stability and continuity of the material transmission. In addition, by installing a universal joint on the eccentric screw, a small swing can be achieved, thereby effectively avoiding material jamming and reducing the spiral torque burden.
[0068] In some embodiments of the present application, the pyrolysis furnace 11 is a pyrolysis mother-and-child furnace, which includes a middle sub-furnace and an outer mother furnace. Spiral blades are respectively provided in the sub-furnace and the mother furnace, and the propulsion directions of the spiral blades are opposite. In this way, the materials can enter and exit in the same direction, and the heat can be reused at the same time, so as to fully pyrolyze the materials at high temperature.
[0069] In some embodiments of the present application, the cracking furnace waste heat utilization device 100 further includes a material cooling device 23, a third closed air discharge device 24 and a fourth closed air discharge device 25, the third closed air discharge device 24 is connected between the material cooling device 23 and the pyrolysis mother-child furnace, and the fourth closed air 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, which is not limited in the present application.
[0070] In this way, the material cooling device 23 can cool the high-temperature material after being treated by the pyrolysis mother-and-child furnace to a suitable temperature, which is convenient for subsequent storage, transportation or further processing. The third closed-air discharge device 24 is connected between the material cooling device 23 and the pyrolysis mother-and-child furnace, so as to ensure the sealing of the entire system when the material is discharged from the pyrolysis mother-and-child furnace and enters the material cooling device 23. The fourth closed-air discharge device 25 is connected to the discharge port of the material cooling device 23, which can ensure that the cooled material can be discharged smoothly, while ensuring the sealing inside the material cooling device 23.
[0071] In some embodiments of the present application, the cracking furnace waste heat utilization device 100 also includes a first exhaust gas filter device 26 connected between the heating system 12 and the pyrolysis furnace 11. The first exhaust gas filter device 26 is used to filter volatile gases and dust materials generated by volatilization of materials, and the filtered exhaust gas can flow into the pyrolysis furnace 11 to assist combustion of the gas burner 121.
[0072] In this way, the first tail gas filter device 26 can effectively filter the volatile gas and dust generated by the volatilization of the material. For the dust, it can prevent solid particles from entering the subsequent heating system 12 and the pyrolysis furnace 11, avoiding these particles from causing wear, blockage and corrosion to the equipment.
[0073] Furthermore, the filtered tail gas flows into the pyrolysis furnace 11 and can assist the combustion of the gas burner 121, which is an effective use of tail gas resources. By utilizing the remaining combustible components in the tail 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 reduces energy costs, but also makes full use of the chemical energy in the tail gas, thereby improving the energy utilization rate of the entire system.
[0074] In some embodiments, the cracking furnace waste heat utilization device 100 also 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 suitable for introducing 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.
[0075] In this way, the third induced draft fan 28 can provide power to effectively introduce the filtered exhaust gas in the first exhaust gas filtering device 26 into the third pipeline 27, ensuring that the exhaust gas can stably flow into the gas burner 121 through the third pipeline 27 according to the set requirements.
[0076] Similarly, the cracking furnace waste heat utilization device 100 may further include a fifth closed-air discharge device 29 connected between the inlet of the first tail gas filter device 26 and the pyrolysis furnace 11. The fifth closed-air discharge device 29 ensures that when the material is discharged from the pyrolysis furnace 11, it can be carried out in a relatively sealed environment, avoiding material leakage from causing harm to the working environment and operators, and also ensuring accurate processing and recovery of the material.
[0077] It should be noted that the exhaust dust generated by the pyrolysis of materials in the pyrolysis mother-and-child furnace passes through the first exhaust gas filter device 26, and the dust falls back through the fifth closed-air discharge, and the exhaust gas is charged into the gas burner 121 through the third pipeline 27 by the third induced draft fan 28 for positive and negative pressure to assist combustion and purification, and 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.
[0078] Similarly, the cracking furnace waste heat utilization device 100 also includes a second tail gas filter device 30 connected between the first volatilization system 131 and the pyrolysis furnace 11. The second tail gas filter device 30 is used to filter the volatile gas and dust generated by the volatilization of the material, and the filtered tail gas can flow into the pyrolysis furnace 11 to assist the combustion of the gas burner 121.
[0079] Optionally, the cracking furnace waste heat utilization device 100 also includes a fourth induced draft fan 31, which is connected between the second exhaust gas filtering device 30 and one end of the third pipeline 27. The fourth induced draft fan 28 is suitable for introducing the exhaust gas in the second exhaust gas filtering device 30 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.
[0080] In this way, the fourth induced draft fan 31 can provide power to effectively introduce the filtered exhaust gas in the second exhaust gas filtering device 30 into the third pipeline 27, ensuring that the exhaust gas can stably flow into the gas burner 121 through the third pipeline 27 according to the set requirements.
[0081] In addition, the cracking furnace waste heat utilization device 100 may further include a sixth closed-air discharge device 32 connected between the inlet of the second tail gas filtering device 30 and the first volatilization system 131. The sixth closed-air discharge device 32 ensures that when the material is discharged from the first volatilization system 131, it can be carried out in a relatively sealed environment, avoiding the harm of material leakage to the working environment and operators, and also ensuring the accurate processing and recovery of the material.
[0082] It should be noted that the volatile gas and dust generated when the material is transported in the first volatilization system 131 are sucked in by the second tail gas filter device 30. The dust is filtered and collected by the filter bag of the second tail gas filter device 30, and then falls off during the air flow pulse vibration, and falls back to the first volatilization system 131 from the fifth closed air discharge device 29. The volatile tail gas discharged from the second tail gas filter device 30 is sucked out by the fourth induced draft fan 31 under negative pressure, and is charged into the gas burner through the third pipeline 27 as a combustion-supporting gas for purification.
[0083] In understanding the scope of the present invention, the term "comprise" and its derivatives as used herein are intended to be open terms, which specify the existence of recorded features, elements, components, groups, wholes and / or steps, but do not exclude the existence of other unrecorded features, elements, components, groups, wholes and / or steps. This concept also applies to words with similar meanings, such as the terms "include", "have" and their derivatives.
[0084] The terms "attached" or "attached" as used herein include: a configuration where an element is directly secured to another element by directly securing the element to the other element; a configuration where an element is indirectly secured to another element by securing the element to an intermediate member which in turn is secured to the other element; and a configuration where one element is integral with the other element, i.e., one element is substantially a part of the other element. This definition also applies to words with similar meanings such as "connect," "connect," "couple," "mount," "bond," "fix," and their derivatives. Finally, terms of degree such as "substantially," "approximately," and "approximately" as used herein represent the amount of deviation that modifies the term such that the end result will not be significantly changed.
[0085] Unless otherwise defined, the technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art of the present invention. The terms used herein are only for describing specific implementation purposes and are not intended to limit the present invention. The features described herein in one embodiment may be applied to another embodiment individually or in combination with other features, unless the feature is not applicable or otherwise specified in the other embodiment.
[0086] The invention has been described through the above-mentioned embodiments, but it should be understood that the above-mentioned embodiments are only for the purpose of example and description, and are not intended to limit the invention to the scope of the described embodiments. In addition, it can be understood by those skilled in the art that the invention is not limited to the above-mentioned embodiments, and more variations and modifications can be made according to the teachings of the invention, and these variations and modifications all fall within the scope of the protection claimed by the invention.
Claims
1. A cracking furnace waste heat utilization device, characterized in that: include: Pyrolysis furnace, suitable for pyrolysis of materials; A heating system, connected to the pyrolysis furnace, adapted to heat the pyrolysis furnace and generate tail gas with heat; The volatilization system is connected to the pyrolysis furnace through a first exhaust pipe. The tail gas generated by the heating system heating the pyrolysis furnace is suitable for flowing into the volatilization system to heat the volatilization system. The volatilization system is suitable for volatilizing the material.
2. The device for utilizing waste heat from a cracking furnace according to claim 1, characterized in that: The volatilization system includes a first volatilization system and a second volatilization system, wherein the first volatilization system is connected between the second volatilization system and the pyrolysis furnace; The gas generated by heating the decomposition furnace is suitable for flowing into the second volatilization system after being heated by the first volatilization system, and heating the second volatilization system.
3. The device for utilizing waste heat from a cracking furnace according to claim 2, characterized in that: It also includes a heat exchange device, in which a first heat exchange channel and a second heat exchange channel capable of heat exchange are arranged; The first heat exchange channel is suitable for connecting external gas to 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 circulating the tail gas heated by the second volatilization system.
4. The device for utilizing waste heat from a cracking furnace according to claim 2, characterized in that: The first volatilization system comprises: The volatilization fins and the volatilization spiral device are connected, the volatilization fins are suitable for exchanging heat with the tail gas to heat the volatilization spiral device, and the volatilization spiral device is suitable for volatilizing the material.
5. The device for utilizing waste heat from a cracking furnace according to claim 4, characterized in that: The volatilization fins are made of corrosion-resistant heat-conducting material.
6. The device for utilizing waste heat from a cracking furnace according to claim 3, characterized in that: It also includes an exhaust gas treatment system, 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.
7. The device for utilizing waste heat from a cracking furnace according to claim 1, characterized in that: The heating system comprises a gas burner, and the gas burner is used to heat the heating system.
8. The device for utilizing waste heat from a cracking furnace according to claim 7, characterized in that: It also includes a first exhaust gas filter device connected between the heating system and the pyrolysis furnace, the first exhaust gas filter device is used to filter volatile gases and dust materials generated by volatilization of materials, and the filtered exhaust gas can flow into the pyrolysis furnace to assist combustion of the gas burner.
9. The device for utilizing waste heat from a cracking furnace according to claim 1, characterized in that: An eccentric screw device for material transmission is provided between the pyrolysis furnace and the volatilization system, and the eccentric screw device is equipped with a universal joint.
10. The device for utilizing waste heat from a cracking furnace according to claim 1, characterized in that: The pyrolysis furnace is a pyrolysis mother-child furnace.