WO2020244472A1 - Dispositif de craquage de méthanol et de propane basé sur des tubes radiants - Google Patents

Dispositif de craquage de méthanol et de propane basé sur des tubes radiants Download PDF

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Publication number
WO2020244472A1
WO2020244472A1 PCT/CN2020/093633 CN2020093633W WO2020244472A1 WO 2020244472 A1 WO2020244472 A1 WO 2020244472A1 CN 2020093633 W CN2020093633 W CN 2020093633W WO 2020244472 A1 WO2020244472 A1 WO 2020244472A1
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WO
WIPO (PCT)
Prior art keywords
methanol
propane
radiant tube
delivery pipe
cracking device
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PCT/CN2020/093633
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English (en)
Chinese (zh)
Inventor
杨景峰
郁伟荣
沈鹏
Original Assignee
上海颐柏科技股份有限公司
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Application filed by 上海颐柏科技股份有限公司 filed Critical 上海颐柏科技股份有限公司
Publication of WO2020244472A1 publication Critical patent/WO2020244472A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
    • C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
    • C23C8/20—Carburising

Definitions

  • the utility model relates to a uniform carburizing device for a heat treatment furnace, in particular to a methanol and propane cracking device based on a radiant tube.
  • the traditional carburizing device is a drip type, and its structure is that the carbon source liquid drops on a rotating fan, and the droplets are dispersed by the rotation of the fan.
  • the high temperature in the furnace quickly cracks the carbon source liquid, and then the carbon source liquid is cracked by the rotation of the fan.
  • the furnace gas is dispersed in the furnace.
  • the problem with this cracking method is that the uneven distribution of the furnace atmosphere in the furnace cavity causes uneven carbon potential everywhere, which will cause considerable differences in the carburization results of different positions of the workpiece or the same workpiece. Lead to large fluctuations in the performance of the workpiece.
  • the existing carburizing heat treatment furnace uses dripping a carbon source, and basically no inert gas is filled.
  • the problem of this carburizing method is that the carbon potential in the furnace cannot be adjusted accurately in real time, so that the depth of the workpiece carburized layer is different. Uniformity causes problems such as fluctuation, inaccuracy and hysteresis of the carburizing result.
  • the technical problem to be solved by the utility model is to provide a radiant tube-based methanol and propane cracking device capable of real-time regulation and uniform carburization in view of the defects of the prior art.
  • the utility model provides a methanol and propane cracking device based on a radiant tube, which includes a plurality of radiant tubes extending into a heat treatment furnace.
  • the radiant tubes have a U-shaped hollow tube structure. Conveying pipe; one end of the connecting conveying pipe is closed, and the other end is made up of a methanol conveying pipe, a propane conveying pipe and a nitrogen conveying pipe.
  • the radiant tube is a hollow electric heating alloy tube.
  • a number of small holes are uniformly distributed on the tube wall of the radiant tube.
  • the radiant tube-based methanol and propane cracking device there are multiple radiant tubes, which are evenly distributed on the inner wall of the heat treatment furnace.
  • one end of the methanol delivery pipe, propane delivery pipe, and nitrogen delivery pipe communicates with the radiation at the top of the heat treatment furnace through a delivery header and a shunt pipe.
  • the tube is connected.
  • the methanol delivery pipe, the propane delivery pipe and the nitrogen delivery pipe are respectively equipped with a mass flow control valve and a one-way regulating valve.
  • the radiant tube-based methanol and propane cracking device further includes at least one monitoring unit arranged in the heat treatment furnace for real-time monitoring of furnace atmosphere and carbon potential.
  • the radiant tube-based methanol and propane cracking device further includes a control unit respectively connected with the monitoring unit, the mass flow control valve and the one-way regulating valve.
  • a mesh plate is welded at the output port of the shunt pipe, and a plurality of mesh holes are uniformly distributed on the mesh plate, and the mesh diameter is 0.1 -0.3mm.
  • the methanol delivery pipe, the propane delivery pipe, the nitrogen delivery pipe, the main delivery pipe and the branch pipe are all electric heating alloy pipes.
  • the monitoring unit is used to monitor the real-time carbon potential in the furnace in real time, and the mass flow control valves of the methanol delivery pipe, propane delivery pipe and nitrogen delivery pipe can be adjusted in real time. So as to realize the precise control of the real-time carbon potential in the furnace, and ensure the sensitivity of the carburizing process and the stability, uniformity and accuracy of the carburizing result.
  • Figure 1 is a schematic view of the structure of a radiant tube-based methanol and propane cracking device of the utility model
  • Figure 2 is a structural schematic diagram of the relative positions of the conveying pipes and the heating furnace in the radiant tube-based methanol and propane cracking device of the utility model;
  • Figure 3 is a schematic diagram of the output port of the split pipe in a radiant tube-based methanol and propane cracking device of the utility model;
  • Figure 4 is a schematic diagram of the methanol delivery pipe, propane delivery pipe, nitrogen delivery pipe and main delivery pipe in a radiant tube-based methanol and propane cracking device of the utility model;
  • Figure 5 is a structural schematic diagram of the relative position of the splitter tube and the radiant tube in the radiant tube-based methanol and propane cracking device of the utility model;
  • the present invention provides a radiant tube-based methanol and propane cracking device, which includes a plurality of radiant tubes 1 extending into a heat treatment furnace.
  • the radiant tubes 1 have a U-shaped hollow tube structure and are methanol and propane. The place where cracking occurs; the tops of several of the radiant tubes 1 are respectively connected to the main conveying pipe 5 through the shunt pipe 6; one end of the connecting main conveying pipe 5 is closed, and the other end is the methanol conveying pipe 2, the propane conveying pipe 3 and the nitrogen conveying pipe 4 gathered together.
  • the carbon potential in the heat treatment furnace is monitored by the monitoring unit, and the mass flow control valves of the methanol delivery pipe 2, the propane delivery pipe 3 and the nitrogen delivery pipe 4 are adjusted to control the carbon potential in the furnace, thereby controlling the carburizing result.
  • the structure of the new radiant tube 1 is adopted in this embodiment.
  • the electric current generates Joule heat on the inner and outer walls of the radiant tube 1, which is used to heat and crack methanol and propane. Utilizing the self-heating of the radiant tube 1 simplifies the structure of the radiant tube compared with traditional resistance wire heating; cracking methanol and propane in the radiant tube 1 improves the cracking efficiency.
  • the radiant tube 1 is a hollow electric heating alloy with a U-shaped structure as a whole.
  • the geometric dimensions such as the surface area diameter, length and wall thickness of the radiant tube 1 are determined according to the power of the heating furnace.
  • One end of the radiant tube 1 is an electrode, and the two ends of the electrode are respectively fixed on the insulation layer on the outside of the furnace shell and the inside of the furnace shell.
  • the radiant tube 1 is installed on the side wall of the heat treatment furnace, and the U-shaped part of the radiant tube 1 is arranged downward, and the wall thickness of the radiant tube 1 is uniform.
  • a number of small holes 11 are uniformly distributed on the wall of the radiant tube 1. After the methanol and propane are cracked in the radiant tube 1, they are directly evenly distributed on the wall of the radiant tube 1. The small holes 11 diffuse out into the heat treatment furnace, and then the air flow generated by the fan in the heat treatment furnace makes the atmosphere more uniformly filled the entire furnace cavity, thereby ensuring the uniformity of carburization of the workpiece and the precise control of carburization.
  • one end of the methanol delivery pipe 2, the propane delivery pipe 3 and the nitrogen delivery pipe 4 is at the top of the heat treatment furnace through the delivery header 5 and the shunt pipe 6 and The radiant tube 1 is connected.
  • the propane delivery pipe 3 and the nitrogen delivery pipe 4 are respectively equipped with a mass flow control valve 7 and a one-way regulating valve 8, and are gas first. After passing through the mass flow control valve 7 and then passing through the one-way regulating valve 8, each group of flow control valves 7 and one-way regulating valves 8 are installed in the delivery pipe valve box 9.
  • the alcohol conveying pipe 2, the propane conveying pipe 3, and the gas conveying pipe 4 converge into a general conveying pipe 5, and a mixed gas of methanol, propane and nitrogen is passed into the furnace in a certain proportion.
  • the mass flow control valve 7 of the methanol delivery pipe 2, the propane delivery pipe 3 and the nitrogen delivery pipe 4 is adjusted to achieve precise control of the carburizing result.
  • the radiant tube-based methanol and propane cracking device further includes at least one monitoring unit arranged in the heat treatment furnace for real-time monitoring of furnace atmosphere and carbon potential.
  • the furnace atmosphere and carbon potential are measured in real time through the monitoring unit, and the mass flow control valves of the methanol delivery pipe 2, the propane delivery pipe 3 and the nitrogen delivery pipe 4 are adjusted by the control unit to adjust the furnace atmosphere and carbon potential.
  • the new carburizing mode is adopted and the monitoring unit is used to monitor the carbon potential in the furnace in real time. If the carbon potential in the furnace is too high, adjust the mass flow control valves of the methanol delivery pipe and the propane delivery pipe to perform fine and coarse adjustments to improve the furnace.
  • the purpose of the internal carbon potential if the carbon potential in the furnace is too low, adjust the mass flow control valve of the nitrogen delivery pipe and fill it with inert gas nitrogen to dilute the carbon potential, so as to achieve the purpose of reducing the carbon potential in the furnace.
  • the precision control of the carbon potential in the furnace if the carbon potential in the furnace is too low, adjust the mass flow control valve of the nitrogen delivery pipe and fill it with inert gas nitrogen to dilute the carbon potential, so as to achieve the purpose of reducing the carbon potential in the furnace.
  • the methanol delivery pipe 2, the propane delivery pipe 3, the nitrogen delivery pipe 4, the main delivery pipe 5, and the branch pipe 6 all use electric heating alloy pipes with uniform wall thickness.
  • the outer diameter of the methanol delivery pipe 2, the propane delivery pipe 3, the nitrogen delivery pipe 4 and the total delivery pipe 5 is 2-5mm, the outer diameter is preferably 3.0mm, the inner diameter is 2-3mm, and the inner diameter is preferably 2.4mm;
  • the end of the tube 5 is closed;
  • the outer diameter of the shunt tube 6 is 2.0-2.8 mm, the outer diameter is preferably 2.2 mm, the inner diameter is 1.6-2.4 mm, and the inner diameter is preferably 2.0 mm.
  • a mesh plate 10 is welded at the output port of each of the shunt pipes 6, and the mesh plate 10 is evenly distributed with a number of mesh holes, the diameter of which is 0.1-0.3 mm, the mesh diameter is preferably 0.2 mm.
  • 20-80 meshes are uniformly distributed on the mesh plate 10 of the output port of each of the shunt pipes 6, preferably 30-50 meshes, and more preferably 33 meshes. Evenly distributing the meshes on the mesh plate 10 can make the gas beam of the mixed gas entering the radiation tube 1 small enough to crack methanol and propane into activated carbon as soon as possible and improve the carburizing efficiency.
  • the diameters of the methanol delivery pipe 2, the propane delivery pipe 3, the nitrogen delivery pipe 4, the main delivery pipe and the branch pipe can also be adjusted according to the size of the heating furnace and the amount of carburization.
  • the use of self-heating of the radiant tube 1 simplifies the structure of the radiant tube compared to traditional resistance wire heating; the cracking of methanol and propane in the radiant tube 1 improves the cracking efficiency.
  • the methanol and propane cracking and carburizing method proposed in the present invention because the one-way regulating valve is used to avoid the reverse flow of gas in the furnace, the safety and reliability of the equipment are improved; because the activated carbon diffuses uniformly and fills the mixed gas ratio, Adjustability, the monitoring system is used to monitor the real-time carbon potential in the furnace, and the mass flow control valves of the methanol delivery pipe 2, the propane delivery pipe 3 and the nitrogen delivery pipe 4 can be adjusted in real time to achieve precise control of the real-time carbon potential in the furnace.
  • the sensitivity of the carburizing process and the stability, uniformity and accuracy of the carburizing result.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
  • Furnace Charging Or Discharging (AREA)

Abstract

Cette invention concerne un dispositif de craquage de méthanol et de propane basé sur des tubes radiants, le dispositif comprenant plusieurs tubes radiants (1) s'étendant dans un four de traitement thermique. Chaque tube radiant (1) est constitué d'une structure de tube creuse en forme de U, et les sommets des tubes radiants (1) sont reliés à un tuyau de transport principal (5) au moyen de tubes de distribution (6). Une première extrémité du tuyau de transport principal (5) est fermée, et l'autre extrémité de celui-ci est formée par convergence d'un tuyau de transport de méthanol (2), d'un tuyau de transport de propane (3) et d'un tuyau de transport d'azote (4).
PCT/CN2020/093633 2019-06-01 2020-05-31 Dispositif de craquage de méthanol et de propane basé sur des tubes radiants WO2020244472A1 (fr)

Applications Claiming Priority (2)

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CN201920816646.5 2019-06-01
CN201920816646.5U CN210287474U (zh) 2019-06-01 2019-06-01 一种基于辐射管的甲醇和丙烷裂解装置

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WO2020244472A1 true WO2020244472A1 (fr) 2020-12-10

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN210287474U (zh) * 2019-06-01 2020-04-10 上海颐柏科技股份有限公司 一种基于辐射管的甲醇和丙烷裂解装置

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03122263A (ja) * 1989-10-06 1991-05-24 Nippon Steel Corp 方向性電磁鋼板の窒化装置
EP1059364A1 (fr) * 1999-06-08 2000-12-13 Jean-Michel Crevoiserat Sonde pour réguler l'atmosphère gazeuse dans les processus de nitruration ou de nitrocarburation dans les fours à atmosphère ou basse pression
CN1802447A (zh) * 2003-05-20 2006-07-12 山特维克知识产权股份有限公司 用于裂解炉的辐射管
CN201228281Y (zh) * 2008-07-03 2009-04-29 爱协林热处理系统(北京)有限公司 具有管状加热系统的大型井式炉
CN108103434A (zh) * 2017-12-28 2018-06-01 重庆臻展热处理有限公司 一种用于金属热处理的箱式多用炉
CN210287474U (zh) * 2019-06-01 2020-04-10 上海颐柏科技股份有限公司 一种基于辐射管的甲醇和丙烷裂解装置

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03122263A (ja) * 1989-10-06 1991-05-24 Nippon Steel Corp 方向性電磁鋼板の窒化装置
EP1059364A1 (fr) * 1999-06-08 2000-12-13 Jean-Michel Crevoiserat Sonde pour réguler l'atmosphère gazeuse dans les processus de nitruration ou de nitrocarburation dans les fours à atmosphère ou basse pression
CN1802447A (zh) * 2003-05-20 2006-07-12 山特维克知识产权股份有限公司 用于裂解炉的辐射管
CN201228281Y (zh) * 2008-07-03 2009-04-29 爱协林热处理系统(北京)有限公司 具有管状加热系统的大型井式炉
CN108103434A (zh) * 2017-12-28 2018-06-01 重庆臻展热处理有限公司 一种用于金属热处理的箱式多用炉
CN210287474U (zh) * 2019-06-01 2020-04-10 上海颐柏科技股份有限公司 一种基于辐射管的甲醇和丙烷裂解装置

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