Vertical Split Tube Furnace
2.Lab Box Furnace Equipment:1L-36L
3.Working Temperature can reach 1200℃-1700℃
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Description
Technical Parameters
The vertical split tube furnace is a cracking furnace with the furnace tube hanging in the center of the radiant section furnace and the burners arranged on both sides.It is mainly composed of radiation heating surface (furnace),convection heating surface,chimney and nozzle to supply heat source.A furnace tube is installed in the radiation section and the convection section,and the raw oil is heated to the required temperature in the furnace tube for cracking reaction to generate cracking gas (olefin),and the cracking gas enters the separation device after quenching.
In a vertical split tube furnace,the cracking raw material undergoes a hydrocarbon cracking reaction in the furnace tube.The fuel oil is sprayed into the furnace through the nozzle to burn,and the generated flue gas flows through the convection chamber and is discharged from the chimney.The heat required for the cracking reaction is provided by the combustion of the fuel outside the tube,and the cracking raw material is heated in the tube to the required temperature for the reaction.The pyrolysis reaction time is the residence time in the furnace tube of the radiation chamber,which is usually short,about 0.8 to 0.9 seconds.
Parameter
| Lab Tubu Furnace Equipment | ||||
| Specification | Working Temperature | Outer diameter of furnace tube(mm) | Number of heating zones | Length of heating zone(mm) |
| TFH：Desktop Type | 1200:1200℃ | 25:Φ25mm | Single Temperature Zone | 150:150mm |
| TFV：Vertical Type | 1500:1500℃ | 30:Φ30mm | Double Temperature Zone | 220:220mm |
| TFR：Rotary Type | 1700:1700℃ | 50:Φ50mm | Three Temperature Zone | 290:290mm |
| TFM：Multi-station Type | 60:Φ60mm | 440:440mm | ||
| TFP：High Pressure Type | 80:Φ80mm | |||
| TFC: CVD | 100:Φ100mm | |||
| TFE: PECVD | ||||
| TFG：Atmosphere Fired Type | ||||
| TFD：Customized | ||||
| Lab Box Furnace Equipment | ||
| Specification | Working Temperature | Volume(L) |
| BFC:General type | 1200:1200℃ | 1:1L |
| BFV:Vacuum Type | 1500:1500℃ | 3.4:3.4L |
| BFW:Visible type | 1700:1700℃ | 4.5:4.5L |
| BFD:Customized | 7.2:7.2L | |
| 12:12L | ||
| 16:16L | ||
| 18:18L | ||
| 36:36L | ||
Application field-Ethene
Its role in ethylene production
Ethylene cracking furnace technology is the most mature technology for ethylene production,and vertical cracked tube furnace is an important form of ethylene cracking furnace.In the process of ethylene production,vertical cracked tube furnace is a key equipment of ethylene plant to produce ethylene,propylene and other olefin products through hydrocarbon cracking reaction.
Application principle in ethylene production
The vertical cracked tube furnace uses the cracking raw material in the furnace tube to produce cracking gas such as ethylene by cracking hydrocarbon reaction at high temperature.The fuel oil is sprayed into the furnace through the nozzle to burn,and the generated flue gas flows through the convection chamber and is discharged from the chimney.The heat required for the cracking reaction is provided by the combustion of the fuel outside the tube,and the cracking raw material is heated in the tube to the required temperature for the reaction.The pyrolysis reaction time is the residence time in the radiation chamber furnace tube and is usually short.
Types and characteristics of vertical split tube furnace
There are many types of vertical cracked tube furnaces,such as SRT type cracking furnace,USC cracking furnace,millisecond cracking furnace, etc.These cracking furnaces have different characteristics and advantages.For example,SRT cracking furnaces have the characteristics of high cracking selectivity,flexible regulation and long operating cycle.The USC cracking furnace is a single row and double radiation riser cracking furnace,and the radiation coils are W-shaped or U-shaped coils,which has the characteristics of super-selective cracking.The radiation coil of millisecond cracking furnace is a one-way straight tube,which has the characteristics of short reaction time and high thermal efficiency.
Optimization measures in ethylene production
In order to improve the efficiency and benefit of vertical cracked tube furnace in ethylene production,the following optimization measures can be taken:
Optimize the structure of the furnace tube: by improving the design and material selection of the furnace tube,improve the high temperature resistance and stability of the furnace tube,and extend the service life of the furnace tube.
Improve thermal efficiency: Adopt advanced combustion technology and heat recovery technology to improve the combustion efficiency and heat recovery rate of the furnace and reduce energy consumption and emissions.
Optimization of cracking process: by adjusting the composition of cracking raw materials and reaction conditions,improve the yield and quality of ethylene and other products.
Strengthen equipment maintenance: Regular maintenance and overhaul of the cracking furnace to ensure the normal operation and safety of the equipment.
Development trend in ethylene production
With the development of the chemical industry and the advancement of technology,the application of vertical cracked tube furnace in ethylene production will continue to develop and improve.In the future,vertical split tube furnaces will develop in the direction of more efficient,environmental protection,economy,intelligence and automation.For example,by adopting new refractory materials,optimizing furnace tube structure,improving thermal efficiency and other measures to further reduce energy consumption and emissions;Through the introduction of intelligent technology and automation technology,improve the operation and control level of cracking furnace;At the same time,the development and application of new materials and advanced catalysts will further promote the application and development of vertical cracking tube furnaces in ethylene production.
Fluidized bed experiment
Although vertical cracked tube furnaces are mainly used for hydrocarbon cracking reactions,it is also possible to combine vertical cracked tube furnaces with fluidized bed technology in some specific research or application scenarios.For example,when exploring new pyrolysis reaction processes or optimizing existing process conditions,fluidized bed experiments can be used to simulate and evaluate different reaction conditions and parameters.By comparing and analyzing the experimental data and results of fluidized bed,it can provide a useful reference for the process optimization and reaction process control of vertical cracked tube furnace.
In addition,some parts or components of vertical split tube furnaces may also be designed or modified using fluidized bed technology.For example, the introduction of fluidized bed technology in some areas of vertical cracked tube furnaces can improve the mixing effect and heat and mass transfer performance of the reaction materials,so as to improve the efficiency of cracking reaction and product quality.
Metal welding
Welding requirement
The furnace tube of cracking furnace mainly includes inlet collecting tube and radiation coil,which are the core parts of cracking furnace.The quality of installation directly determines whether the device can run stably for a long time.Due to the harsh working environment inside the cracking furnace,the requirements for welding joints are extremely high,not only to ensure the strength and tightness of the weld,but also to prevent cracks,slag inclusion and other defects in the welding process.
Welding materials
The choice of welding materials for cracking furnace tubes should be determined according to the chemical composition,mechanical properties and working environment of the base material.Common welding materials include a variety of high nickel chromium alloy wire,electrode and so on.These welding materials should have good high temperature strength,corrosion resistance and thermal crack resistance.
Welding process
he shape and size of the groove should be determined according to the welding process and the thickness of the base material.The groove should be processed smoothly,without cracks,slag inclusion and other defects.
Positioning welding is an important step in the welding process,which is used to fix the position of the solder and prevent deformation during the welding process.The length and height of the positioning weld should be moderate and evenly distributed along the circumference of the tube.
Pre-welding preheating is one of the important measures to prevent welding cracks.The preheating temperature should be determined according to the chemical composition,thickness and welding process of the base material.Preheating can reduce the temperature gradient of welded joints, reduce welding stress and crack tendency.
The welding method of cracking furnace tube is usually argon arc welding,manual arc welding and so on.For thicker base materials,multi-layer and multi-pass welding processes can be used to ensure the quality and strength of the weld.
Post-welding heat treatment is an important step to eliminate welding stress and improve the performance of the weld.Common post-welding heat treatment includes stress relief annealing,tempering,etc.
Welding inspection
Welding inspection is an important step to ensure the quality of welding.Common welding inspection methods include appearance inspection,non-destructive testing and mechanical properties test.
Appearance inspection
The surface of the weld is inspected by the naked eye or a magnifying glass to find cracks,slag inclusion,non-fusion and other defects on the surface of the weld.
Nondestructive testing
Nondestructive testing is a method of detecting internal defects in welds without damaging the welds.Common nondestructive testing methods include X-ray inspection,ultrasonic inspection and so on.
Mechanical properties test
Mechanical properties test is to carry out tensile,bending,impact and other tests on the weld to evaluate the strength and toughness of the weld and other mechanical properties.
Welding precautions
Strictly control welding parameters
Welding parameters include welding current,voltage,welding speed,etc., which have an important impact on the quality and performance of the weld.Therefore,the welding parameters should be strictly controlled during the welding process to ensure that the quality and performance of the weld meet the requirements.
Prevent welding deformation
The deformation generated in the welding process is one of the important factors affecting the quality of weldparts.Therefore,effective measures should be taken in the welding process to prevent welding deformation,such as using a reasonable welding sequence,the use of fixtures and so on.
Strengthen the protection of welded joints
LWelded joints are one of the weakest links in the weldment,so the protection of welded joints should be strengthened.During the welding process,effective measures should be taken to protect the welded joints,such as the use of protective gases,welding slag scavengers,etc..
Matters needing attention
Safety precautions
Check before operation
Before use, the furnace body, heating elements, control system and other components should be carefully checked to ensure that there is no damage or abnormal.
Check that the power and air sources (if applicable) are connected correctly and ensure their stability.
Personal Protection
Operators should wear appropriate protective equipment, such as heat-resistant gloves, protective glasses, protective clothing, etc., to prevent injuries caused by high temperatures or flying objects.
Avoid prolonged exposure to high temperatures, which can cause health problems.
Emergency shutdown
Familiar with the position and operation of the emergency stop button, so as to stop quickly in an emergency.
In the event of abnormal conditions, such as abnormal temperature rise, equipment failure, etc., stop the machine immediately and seek the help of professional maintenance personnel.
Fire prevention measures
Ensure that there is no flammable material around the furnace to prevent fire.
Be equipped with appropriate fire extinguishing equipment and be familiar with its use.
Operation precautions
Temperature control
Set the appropriate temperature according to the process requirements and closely monitor the temperature changes in the furnace.
Avoid a sharp increase or decrease in temperature to avoid damage to equipment or materials.
01
Atmosphere control (if applicable)
Adjust the atmosphere in the furnace according to the process requirements, such as introducing inert gas, reducing gas, etc.
Periodically check the stability and accuracy of the atmosphere control system.
02
Material handling
During the heating process, the material should be evenly distributed in the furnace to improve the heating efficiency.
Avoid placing flammable, explosive or corrosive materials into the furnace.
03
Regular maintenance
Regular cleaning and maintenance of furnace body, heating element, control system, etc., to ensure their normal operation.
Inspect and replace worn or damaged parts to extend the service life of the equipment.
04
Other notes
Training and Education
Conduct necessary training and education for operators to familiarize them with the operation methods and precautions of the equipment.
Ensure that the operator understands the safe operation procedures and emergency handling measures of the equipment.
Recording and monitoring
Record the operating parameters and abnormal conditions of the equipment for fault analysis and improvement.
Periodically evaluate the performance of the equipment to ensure that it meets the process requirements.
Compliance
Ensure that equipment is used in accordance with local safety regulations and standards.
When necessary, seek professional organizations to conduct safety assessment and certification of equipment.
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