Cracking process and system for increasing acetylene yield

Abstract

The present application relates to a kind of acetylene yield improvement pyrolysis method and system.The present application can set different reaction temperatures according to the needs in different reaction zones by designing segmented reaction zone;With methane or methane-rich mixed gas as carrier gas, it not only shortens the reaction time, but also can promote the cracking of methane, and the reaction product hydrogen of methane cracking is the activation component of high-temperature cracking of cracking raw material, which can promote the chain scission of cracking raw material to generate acetylene and improve the acetylene yield.

Description

Technical Field

[0001] This invention relates to the field of petrochemicals, and specifically to a cracking method and system for improving acetylene yield. Background Technology

[0002] In my country, due to declining crude oil reserves and increasing environmental awareness, the availability of low-quality oil and increased processing profits have led to a decrease in the market share of low-quality gasoline and diesel. Simultaneously, the demand for high-quality gasoline is gradually increasing. Meanwhile, slower economic growth has resulted in a structural surplus of diesel, causing its market share to gradually decline. The shortage of chemical feedstocks such as low-carbon olefins and aromatics still needs to be addressed to achieve refining transformation and further development. Therefore, it is necessary to develop high-temperature cracking technology for producing chemical feedstocks from low-quality heavy oil, thereby achieving a successful transformation from oil to chemicals.

[0003] Acetylene is an important basic organic chemical raw material. Under certain conditions, it can polymerize to produce aromatic hydrocarbons such as benzene, toluene, xylene, naphthalene, anthracene, styrene, and indene. Industrial production of acetylene can be achieved through the calcium carbide method, partial oxidation of methane, or methane arc cracking. Among these, the calcium carbide method is relatively mature and accounts for a large share of industrial production; however, this process causes pollution and has relatively high energy consumption. Plasma pyrolysis of coal to produce acetylene is a newer route for the direct conversion of coal into acetylene. Research began in the 1960s at the University of Sheffield in the UK. Studies showed that in a high-temperature, high-enthalpy, and highly reactive arc thermal plasma jet, the volatiles of coal, and even fixed carbon, can be directly converted into acetylene. Subsequently, extensive research on this technology was conducted in countries such as the UK, India, the US, and Germany. Since the 1990s, Chinese researchers have conducted countless basic and engineering studies in this field. With the development of science and technology, some researchers have also studied the use of plasma to produce acetylene from coal tar, bituminous materials, and oil slurry, but there have been no industrial reports to date. Summary of the Invention

[0004] The purpose of this invention is to provide a high-temperature pyrolysis method and system for improving acetylene yield. The method of this invention can improve the yield of acetylene.

[0005] A first aspect of the present invention provides a cracking method for improving acetylene yield, comprising:

[0006] (1) After being preheated in the first reaction zone upstream of the cracking reactor, methane gas enters the second reaction zone in the middle of the cracking reactor.

[0007] (2) The pyrolysis feedstock is introduced into the second reaction zone in the middle of the pyrolysis reactor and mixed with preheated methane gas to undergo a pyrolysis reaction, yielding pyrolysis products containing carbon black and acetylene.

[0008] (3) The pyrolysis products are subjected to gas-solid separation to obtain solid product carbon black and gaseous product acetylene;

[0009] Wherein, the methane gas is methane or a methane-rich mixture, and the volume percentage of methane in the methane-rich mixture is 10%-100%;

[0010] The preheating temperature of the first reaction zone is 900-1200℃, the pyrolysis reaction temperature of the second reaction zone is 1200-2500℃, and the pyrolysis reaction time is 1-100 milliseconds; preferably, the pyrolysis reaction temperature of the second reaction zone is 1400-2000℃, and the pyrolysis reaction time is 2-70 milliseconds.

[0011] According to the method of the first aspect, the pyrolysis feedstock is selected from one or more of the following: biomass oil, waste plastic oil, tire oil, inferior oil, and catalytic cracking products;

[0012] Preferably, the inferior oil is selected from one or more of vacuum residue, coal tar, and solvent deasphalted oil; and / or the catalytic cracking product is selected from one or more of catalytic cracking slurry, catalytic cracking diesel, and catalytic cracking recycle oil.

[0013] According to the method in the first aspect, the feed ratio of methane gas to cracked feedstock per unit time is 1-10 liters / gram.

[0014] According to the method of the first aspect, the pyrolysis feedstock is preheated and then purged by feed purge gas before entering the pyrolysis reactor;

[0015] Preferably, the preheating temperature of the pyrolysis feedstock is 20-100℃, the temperature of the feed purge gas is 100-300℃, and / or the flow rate of the feed purge gas is 50-100ml / min.

[0016] According to the method of the first aspect, the gas-solid separation step of the pyrolysis products includes:

[0017] The pyrolysis products are separated by carbon black filtration and the carbon black product is collected. The separated gaseous products are cooled by quenching and separated by gas-liquid separation and the acetylene product is collected.

[0018] According to the method of the first aspect, the quenching medium used for the quenching cooling is selected from one or more of the following: water, nitrogen, and argon;

[0019] The cooling rate of the gaseous products during the quenching process is 500-1000°C / ms; and / or

[0020] The temperature of the gaseous product after the rapid cooling process is 200-350℃.

[0021] A second aspect of the present invention provides a cracking system for improving acetylene yield, comprising:

[0022] The injection unit includes:

[0023] Methane gas preheating furnace, used to preheat methane gas;

[0024] Cracking feedstock preheating furnace, used to preheat cracking feedstock;

[0025] Feed purge gas preheating furnace is used to preheat the feed purge gas;

[0026] The reaction unit includes:

[0027] The pyrolysis reactor includes a first reaction zone and a second reaction zone. The first reaction zone has a methane gas inlet connected to a methane gas preheating furnace of the sample feeding unit. The second reaction zone has a pyrolysis feedstock inlet. Purge feedstock preheated by the feedstock purge gas preheating furnace enters the second reaction zone through the pyrolysis feedstock inlet. The first reaction zone is heated by a first electromagnetic induction device, which includes a first electromagnetic induction coil sleeved outside the first reaction zone. The second reaction zone is heated by a second electromagnetic induction device, which includes a second electromagnetic induction coil sleeved outside the second reaction zone.

[0028] Two infrared temperature probes are used to measure the temperature of the first and second reaction zones of the pyrolysis reactor, respectively.

[0029] The product cooling and collection unit includes:

[0030] Carbon black collector, used to filter and separate carbon black from pyrolysis products;

[0031] The product gas quench spray system is equipped with a gas product inlet, a quench medium inlet, and a material outlet, and is used to cool the gas product after carbon black filtration and separation.

[0032] A gas-liquid separator is provided with a material inlet, a gas outlet and a quenching medium outlet, and is used to separate the gas products after quenching into gas and liquid.

[0033] A gas collection device for collecting gaseous products, the gas collection device being connected to the gas outlet of the gas-liquid separator.

[0034] According to the system of the second aspect, the carbon black collector is located downstream of the pyrolysis reactor;

[0035] Preferably, the carbon black collector is provided with a carbon black filter, a gas-solid inlet, a gas outlet, and a solid storage chamber.

[0036] According to the system of the second aspect, the pyrolysis reactor is provided with an induction heating medium and an outer casing, wherein the induction heating medium is placed in the outer casing;

[0037] Preferably, the induction heating medium is graphite material; and / or the outer tube is a quartz tube.

[0038] According to the system of the second aspect, wherein the first reaction zone of the pyrolysis reactor uses one or more graphite tubes as the induction heating medium, preferably 5 to 25 tubes, most preferably 15 tubes; and / or

[0039] The second reaction zone of the pyrolysis reactor uses a single graphite rod or multiple graphite rods as the induction heating medium, preferably a single graphite rod with multiple through holes.

[0040] The advantages of the present invention through the above technical solution are as follows:

[0041] (1) The electromagnetic induction coil heating of the pyrolysis reactor can achieve rapid heating of the pyrolysis reactor, and the reaction temperature control is simple and the operation is stable.

[0042] (2) Design segmented reaction zones, which can set different reaction temperatures for different reaction zones according to requirements;

[0043] (3) Using methane or a methane-rich mixture as the carrier gas can shorten the reaction time and promote the cracking of methane. The hydrogen gas, a product of methane cracking, is an active component of the high-temperature cracking of the cracking feedstock, which can promote the chain breaking of the cracking feedstock to generate acetylene and increase the acetylene yield. Attached Figure Description

[0044] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the following detailed description to explain the invention, but do not constitute a limitation thereof.

[0045] Figure 1 A flowchart illustrating a specific embodiment of the method of the present invention is shown.

[0046] Explanation of reference numerals in the attached figures:

[0047] 1. First injection port; 2. Second injection port; 3. Raw material carrier gas pipeline; 4-5 pipeline; 7. Electromagnetic induction coil; 8. Quenching water inlet; 9. Pipeline; 10. Quenching water outlet; 101. Injection purge gas preheating furnace; 102. Raw material preheating furnace; 103. Methane gas preheating furnace; 201. Infrared temperature probe I; 202. Infrared temperature probe II; 203. Pyrolysis reactor; 204. Electromagnetic induction device I; 205. Electromagnetic induction device II; 301. Carbon black collector; 302. Product gas quench spray system; 303. Gas-liquid separator; 304. Gas collection bag; I. First reaction zone; II. Second reaction zone. Detailed Implementation

[0048] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. Through these descriptions, the features and advantages of the present application will become clearer and more apparent.

[0049] The term “exemplary” as used herein means “serving as an example, embodiment, or illustration.” Any embodiment illustrated herein as “exemplary” is not necessarily to be construed as superior to or better than other embodiments. Although various aspects of embodiments are shown in the accompanying drawings, the drawings are not necessarily drawn to scale unless specifically indicated otherwise.

[0050] Furthermore, the technical features involved in the different embodiments of this application described below can be combined with each other as long as they do not conflict with each other.

[0051] In this application, the terms "upstream" and "downstream" refer to the direction of reaction material flow. For example, when the reaction material flows from bottom to top, "upstream" refers to the position located at the bottom, while "downstream" refers to the position located at the top.

[0052] This invention provides a cracking method for improving acetylene yield, comprising:

[0053] (1) After being preheated in the first reaction zone upstream of the cracking reactor, methane gas enters the second reaction zone in the middle of the cracking reactor.

[0054] (2) The pyrolysis feedstock is introduced into the second reaction zone in the middle of the pyrolysis reactor and mixed with preheated methane gas to undergo a pyrolysis reaction, yielding pyrolysis products containing carbon black and acetylene.

[0055] (3) The pyrolysis products are subjected to gas-solid separation to obtain solid product carbon black and gaseous product acetylene;

[0056] Wherein, the methane gas is methane or a methane-rich mixture, and the volume percentage of methane in the methane-rich mixture is 10%-100%;

[0057] The preheating temperature of the first reaction zone is 900-1200℃, the pyrolysis reaction temperature of the second reaction zone is 1200-2500℃, and the pyrolysis reaction time is 1-100 milliseconds; preferably, the pyrolysis reaction temperature of the second reaction zone is 1400-2000℃, and the pyrolysis reaction time is 2-70 milliseconds.

[0058] The method of the present invention uses methane or a methane-rich mixed gas to enter the first reaction zone from the top of the reactor, and uses an electromagnetic induction cracking reactor to crack the cracking raw material. It can achieve rapid heating of the cracking reactor and stable temperature. Compared with plasma reactors, the equipment is simpler, smaller in size, easier to implement and operate, and has a high yield of acetylene and / or hydrogen.

[0059] According to the present invention, methane or a methane-rich mixture is used, on the one hand, to regulate the reaction time so that the pyrolysis feedstock passes through the pyrolysis reactor quickly, and on the other hand, the hydrogen gas produced by the high-temperature cracking of methane can activate the high-temperature cracking of the pyrolysis feedstock to further improve the acetylene yield.

[0060] The technical solution of the present invention will be further described below with reference to the accompanying drawings, such as... Figure 1 As shown, the method includes: preheating methane or a methane-rich mixture in a methane preheating furnace 103, introducing it into a first reaction zone I through a first inlet 1 at the top of a cracking reactor 203 heated by electromagnetic induction; heating the first reaction zone I to 900-1200°C using an electromagnetic induction device 1204; preheating the cracking feedstock in a cracking feedstock preheating furnace 102, atomizing it under the action of a purge gas, and introducing it into the inlet of the second reaction zone through a second inlet 2 in the middle of the cracking reactor 203 heated by electromagnetic induction; and reacting it with the first... The pyrolysis products from reaction zone I are mixed and enter the second reaction zone II of the electromagnetic induction high-temperature pyrolysis reactor for ultra-high temperature pyrolysis reaction. The reaction temperature in the second reaction zone II is heated to 1200-2500℃ by the electromagnetic induction device II205. The resulting reaction products pass sequentially through the carbon black collector 301 and the product gas quench spray system 302, and then enter the gas-liquid separator 303 through pipelines. After gas-liquid separation, the gaseous products enter the gas collection bag 304 through pipeline 9, and the cooling water is discharged from the device through the quench water outlet 10.

[0061] In one embodiment, the pyrolysis feedstock is selected from one or more of the following: biomass oil, waste plastic oil, tire oil, inferior oil, and catalytic cracking products;

[0062] Preferably, the inferior oil is selected from one or more of vacuum residue, coal tar, and solvent deasphalted oil; and / or the catalytic cracking product is selected from one or more of catalytic cracking slurry, catalytic cracking diesel, and catalytic cracking recycle oil.

[0063] In one embodiment, the feed ratio of methane gas to pyrolysis feedstock per unit time is 1-10 liters / gram.

[0064] In one embodiment, the pyrolysis feedstock is preheated and then purged by feed purge gas before entering the pyrolysis reactor.

[0065] Preferably, the preheating temperature of the pyrolysis feedstock is 20-100℃, more preferably 25-100℃, the temperature of the feed purge gas is 100-300℃, and / or the flow rate of the feed purge gas is 50-100ml / min.

[0066] In one embodiment, the gas-solid separation step of the pyrolysis products includes:

[0067] The pyrolysis products are separated by carbon black filtration and the carbon black product is collected. The separated gaseous products are cooled by quenching and separated by gas-liquid separation and the acetylene product is collected.

[0068] In one embodiment, the quenching medium used for the quenching cooling is selected from one or more of the following: water, nitrogen, and argon;

[0069] The cooling rate of the gaseous products during the quenching process is 500-1000°C / ms; and / or

[0070] The temperature of the gaseous product after the rapid cooling process is 200-350℃.

[0071] The present invention also provides a cracking system for improving acetylene yield, comprising:

[0072] The injection unit includes:

[0073] Methane gas preheating furnace, used to preheat methane gas;

[0074] Cracking feedstock preheating furnace, used to preheat cracking feedstock;

[0075] Feed purge gas preheating furnace is used to preheat the feed purge gas;

[0076] The reaction unit includes:

[0077] The pyrolysis reactor includes a first reaction zone and a second reaction zone. The first reaction zone has a methane gas inlet connected to a methane gas preheating furnace of the sample feeding unit. The second reaction zone has a pyrolysis feedstock inlet. Purge feedstock preheated by the feedstock purge gas preheating furnace enters the second reaction zone through the pyrolysis feedstock inlet. The first reaction zone is heated by a first electromagnetic induction device, which includes a first electromagnetic induction coil sleeved outside the first reaction zone. The second reaction zone is heated by a second electromagnetic induction device, which includes a second electromagnetic induction coil sleeved outside the second reaction zone.

[0078] Two infrared temperature probes are used to measure the temperature of the first and second reaction zones of the pyrolysis reactor, respectively.

[0079] The product cooling and collection unit includes:

[0080] Carbon black collector, used to filter and separate carbon black from pyrolysis products;

[0081] The product gas quench spray system is equipped with a gas product inlet, a quench medium inlet, and a material outlet, and is used to cool the gas product after carbon black filtration and separation.

[0082] A gas-liquid separator is provided with a material inlet, a gas outlet and a quenching medium outlet, and is used to separate the gas products after quenching into gas and liquid.

[0083] A gas collection device for collecting gaseous products, the gas collection device being connected to the gas outlet of the gas-liquid separator.

[0084] In one embodiment, the carbon black collector is located downstream of the pyrolysis reactor;

[0085] Preferably, the carbon black collector is provided with a carbon black filter, a gas-solid inlet, a gas outlet, and a solid storage chamber.

[0086] In one embodiment, the pyrolysis reactor is provided with an induction heating medium and an outer casing, wherein the induction heating medium is placed in the outer casing;

[0087] Optionally, the induction medium in the first and second reaction zones of the pyrolysis reactor can be a tube or rod made of different materials and shapes, such as graphite, stainless steel, or tungsten metal, which can be used as electromagnetic induction material.

[0088] Optionally, the pipe may be a single pipe or a combination of multiple pipes with different inner diameters and wall thicknesses;

[0089] Optionally, the rod may be one or more solid rods;

[0090] Optionally, one or more vertical through holes can be drilled in the solid rod;

[0091] Preferably, the induction heating medium is graphite material; and / or the outer tube is a quartz tube.

[0092] In one embodiment, the first reaction zone of the pyrolysis reactor uses one or more graphite tubes as the induction heating medium, preferably 5 to 25 tubes, most preferably 15 tubes; and / or

[0093] The second reaction zone of the pyrolysis reactor uses a single graphite rod or multiple graphite rods as the induction heating medium, preferably a single graphite rod with multiple through holes.

[0094] The present invention will be further illustrated by the following examples, but the present invention is not limited thereto.

[0095] In the examples and comparative examples:

[0096] The reaction temperature refers to the temperature in the middle of the reaction tube covered by the electromagnetic induction coil;

[0097] Reaction time = Length of inner reaction tube / Flow rate of reactants in inner reaction tube;

[0098] Product yield = Product weight / Crack feedstock weight × 100%;

[0099] The gaseous reaction products were determined by gas chromatography.

[0100] like Figure 1 As shown, the method of the present invention includes: preheating methane or a methane-rich mixture to about 500°C in a methane preheating furnace 103, introducing it into a first reaction zone I through a first inlet 1 at the top of a cracking reactor 203 heated by electromagnetic induction, heating the first reaction zone I by an electromagnetic induction device 1204 to a reaction temperature of 1100°C, preheating the cracking feedstock to 80°C in a cracking feedstock preheating furnace 102, introducing it into the inlet of a second reaction zone through a second inlet 2 in the middle of the cracking reactor 203 heated by electromagnetic induction, mixing it with the cracking products that have passed through the first reaction zone I, and entering the second reaction zone II of the electromagnetic induction high-temperature cracking reactor for ultra-high temperature cracking reaction, heating the reaction temperature of the second reaction zone II to 1600°C by an electromagnetic induction device II 205, and passing the obtained reaction products sequentially through a carbon black collector 301 and a product gas quench spray system 302, and then through a pipeline into a gas-liquid separator 303 for gas-liquid separation, after which the gaseous products enter a gas collection bag 304 through a pipeline 9, and the cooling water is discharged from the device through a quench water outlet 10.

[0101] Examples 1-2

[0102] This embodiment is in Figure 1The system shown follows the process and properties described in Table 1 of the aforementioned specific implementation method. Yangzhou HCO is used as the pyrolysis feedstock, with a preheating temperature of 500℃ and an inlet flow rate of 4L / min. The reaction temperature in the first reaction zone is 1100℃. The first reaction zone utilizes 15 graphite tubes with an inner diameter of 40mm, an outer diameter of 80mm, and a length of 200mm as the induction heating medium. The graphite tubes are vertically arranged along their length. The reaction temperatures in the second reaction zones are 1500℃ and 1400℃, respectively. The second reaction zone utilizes a single graphite rod as the induction heating medium. The graphite rod has a diameter of 12mm, with three through holes of 3mm inner diameter and 80mm length evenly distributed in the middle. The outer tube of the quartz tube adopts a variable diameter structure: the upper inner diameter is 30mm, the outer diameter is 36mm, and the length is 220mm; the lower inner diameter is 14mm, the outer diameter is 20mm, and the length is 90mm. The variable diameter of the quartz tube is located at 220mm. Two electromagnetic induction coils are provided on the outer circumference of the outer tube. A carbon black collector is installed at the bottom of the pyrolysis reactor, and a quencher is installed at the reactor outlet. Water is used as the quenching medium to achieve a product cooling rate of 500℃ / ms and control the temperature of the reaction product at the reactor outlet to 200℃. A gas collection bag is used as the gas collector. Specific reaction conditions and results are shown in Table 3. The specific composition of the methane mixture is 10% methane and 90% nitrogen.

[0103] Comparative Example 1

[0104] Methane gas and raw materials were fed together from the feed inlet of the second reaction zone. The reaction temperature was 1500℃, the preheating temperature was 500℃, and the gas flow rate was 4L / min. The results are shown in Table 2.

[0105] Table 1

[0106] Raw material name Yangzhou HCO <![CDATA[Density (20 °C) / (g / cm 3 )]]> 899.8 Carbon percentage by weight % 87.56 Hydrogen percentage (by weight) 11.96 Sulfur content (%) 0.276 Nitrogen content (%) 0.18 Hydrocarbon composition / ℃ Alkanes, % by weight 51 Cycloalkanes, % by weight 8.3 Monocyclic aromatic hydrocarbons, % by weight 3.4 Bicyclic aromatic hydrocarbons, % by weight 8 Tricyclic aromatic hydrocarbons, % by weight 15.3 Total aromatics, % by weight 38.2 Gel, weight % 2.5 Total, by weight % 100

[0107] Table 2

[0108] project Example 1 Example 2 Comparative Example 1 Cracking feedstock Yangzhou HCO Yangzhou HCO Yangzhou HCO Reaction temperature, °C 1500 1400 1500 Methane mixture flow rate, liters per minute 4 4 4 Oil inlet rate, grams per minute 0.5 0.5 0.5 Oil injection time, minutes 2 2 2 Response time, milliseconds 20 23 20 Acetylene yield, % by weight 25.34 22.18 10.32 Carbon black yield, % by weight 60.89 63.5 72.3

[0109] As can be seen from Table 2, the method of the present invention can improve the yield of acetylene from catalytic cracking.

[0110] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0111] The present application has been described above with reference to preferred embodiments; however, these embodiments are merely exemplary and illustrative. Various substitutions and modifications can be made to the present application based on these embodiments, all of which fall within the protection scope of the present application.

Claims

1. A cracking method for improving acetylene yield, comprising: (1) After the methane gas is introduced into the first reaction zone upstream of the cracking reactor for preheating and cracking, it enters the second reaction zone in the middle of the cracking reactor. (2) The pyrolysis feedstock is introduced into the second reaction zone in the middle of the pyrolysis reactor and mixed with the pyrolysis products in the first reaction zone to undergo a pyrolysis reaction, resulting in pyrolysis products containing carbon black and acetylene; (3) The pyrolysis products in the second reaction zone are subjected to gas-solid separation to obtain solid product carbon black and gaseous product acetylene; The volume percentage of methane in the methane gas is 10%-100%. The preheating temperature of the first reaction zone is 900-1200℃, the pyrolysis reaction temperature of the second reaction zone is 1200-2500℃, and the pyrolysis reaction time of the second reaction zone is 1-100 milliseconds; The feed ratio of methane gas to cracked feedstock per unit time is 1-10 liters / gram.

2. The method according to claim 1, characterized in that, The pyrolysis feedstock is selected from one or more of the following: biomass oil, waste plastic oil, tire oil, inferior oil, and catalytic cracking products; The inferior oil is selected from one or more of vacuum residue, coal tar and solvent deasphalted oil; The catalytic cracking products are selected from one or more of catalytic cracking slurry, catalytic cracking diesel, and catalytic cracking recycle oil.

3. The method according to claim 1, characterized in that, The pyrolysis feedstock is preheated and then purged by feed purge gas before entering the pyrolysis reactor.

4. The method according to claim 1, characterized in that, The gas-solid separation includes: The pyrolysis products in the second reaction zone are collected as carbon black products after being filtered and separated. The gaseous products after filtration and separation are collected as acetylene products after being cooled and separated into gas and liquid.

5. The method according to claim 4, characterized in that, The quenching medium used for the quenching and cooling is selected from one or more of the following: water, nitrogen, and argon; The cooling rate of the gaseous products during the quenching process is 500-1000°C / ms; and / or The temperature of the gaseous product after the rapid cooling process is 200-350℃.

6. The method according to claim 3, characterized in that, The preheating temperature of the pyrolysis feedstock is 20-100℃, the temperature of the feed purge gas is 100-300℃, and / or the flow rate of the feed purge gas is 50-100 ml / min.

7. The method according to claim 1, characterized in that, The pyrolysis reaction temperature in the second reaction zone is 1400-2000℃, and the pyrolysis reaction time is 2-70 milliseconds.

8. A cracking system for improving acetylene yield, comprising: The injection unit includes: Methane gas preheating furnace, used to preheat methane gas; Cracking feedstock preheating furnace, used to preheat cracking feedstock; Feed purge gas preheating furnace is used to preheat the feed purge gas; The reaction unit includes: The pyrolysis reactor includes a first reaction zone and a second reaction zone. The first reaction zone has a methane gas inlet connected to a methane gas preheating furnace of the sample feeding unit. The second reaction zone has a pyrolysis feedstock inlet. Purge feedstock preheated by the feedstock purge gas preheating furnace mixes with the pyrolysis products of the first reaction zone through the pyrolysis feedstock inlet and enters the second reaction zone. The first reaction zone is heated by a first electromagnetic induction device, which includes a first electromagnetic induction coil sleeved outside the first reaction zone. The second reaction zone is heated by a second electromagnetic induction device, which includes a second electromagnetic induction coil sleeved outside the second reaction zone. Two infrared temperature probes are used to measure the temperature of the first and second reaction zones of the pyrolysis reactor, respectively. The product cooling and collection unit includes: A carbon black collector is used to filter and separate carbon black from the pyrolysis products in the second reaction zone. The product gas quench spray system is equipped with a gas product inlet, a quench medium inlet, and a material outlet, and is used to cool the gas product after it has been filtered and separated by the carbon black collector. A gas-liquid separator is provided with a material inlet, a gas outlet and a quenching medium outlet, and is used to perform gas-liquid separation on the gas product after quenching by the product gas quenching spray system. A gas collection device for collecting gaseous products, wherein the gas collection device is connected to the gas outlet of the gas-liquid separator; The preheating temperature of the first reaction zone is 900-1200℃, and the pyrolysis reaction temperature of the second reaction zone is 1200-2500℃.

9. The system according to claim 8, characterized in that, The pyrolysis reactor is equipped with an induction heating medium and an outer casing, with the induction heating medium placed inside the outer casing.

10. The system according to claim 9, characterized in that, The first reaction zone of the pyrolysis reactor uses one or more graphite tubes as the induction heating medium; and / or The second reaction zone of the pyrolysis reactor uses a single graphite rod or multiple graphite rods as the induction heating medium.

11. The system according to claim 8, characterized in that, The carbon black collector is equipped with a carbon black filtration device, a gas-solid inlet, a gas outlet, and a solid storage chamber.

12. The system according to claim 9, characterized in that, The induction heating medium is graphite material; and / or the outer tube is a quartz tube.

13. The system according to claim 10, characterized in that, The first reaction zone of the pyrolysis reactor uses 5 to 25 graphite tubes as the induction heating medium.

14. The system according to claim 10, characterized in that, The first reaction zone of the pyrolysis reactor uses 15 graphite tubes as the induction heating medium.

15. The system according to claim 10, characterized in that, The second reaction zone of the pyrolysis reactor uses a single graphite rod with multiple through holes as the induction heating medium.

Images