Dichloroethane cracking furnace
By suspending the radiant furnace tube support outside the supporting beam in the dichloroethane cracking furnace and using a sliding or rolling mechanism, the problems of shortened equipment life and thermal stress at high temperatures are solved, achieving cost savings and improved equipment stability.
Patent Information
- Application Number
- CN202423150965.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-20
- Publication Date
- 2025-11-14
- Estimated Expiration
- 2034-12-20
AI Technical Summary
Traditional dichloroethane cracking furnaces use expensive high-temperature resistant alloy materials at high temperatures, which leads to a shortened equipment life and thermal stress affecting equipment stability.
The radiant furnace tube support is suspended on a support beam, which is then positioned outside the furnace chamber. A sliding or rolling mechanism is used to accommodate thermal displacement, and the temperature is reduced by the design of the bottom air intake and top exhaust ports of the radiant furnace tube support.
It reduces reliance on expensive materials, extends equipment lifespan and improves stability, and lowers production costs.
Smart Images
Figure CN223542945U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of flame furnace technology, specifically to a dichloroethane cracking furnace. Background Technology
[0002] Traditional dichloroethane cracking furnaces have some limitations in the production of vinyl chloride monomer and hydrogen chloride.
[0003] like Figure 1 As shown, the convection chamber 2 and the radiation chamber 1 are directly connected vertically to form a closed furnace structure. The supporting beam 7 is set at the bottom of the convection chamber 2. The radiation furnace tube support 6, which is used to fix the radiation furnace tube 5 in the radiation chamber 1, is suspended on the supporting beam 7. This structure has the following defects:
[0004] The support beam 7 is built into the furnace chamber. In the high-temperature operating environment, the support beam 7 and the radiant furnace tube support 6 need to use expensive high-temperature resistant alloy materials. This not only increases the production cost, but also these materials are prone to thermal fatigue under continuous high temperature, which leads to a shortened equipment life.
[0005] The enclosed furnace structure does not fully consider the impact of thermal displacement on equipment stability, which makes the radiant furnace tubes prone to generating large thermal stress when working at high temperatures, further affecting the long-term stable operation of the equipment. Utility Model Content
[0006] The purpose of this invention is to overcome the aforementioned shortcomings and provide a dichloroethane cracking furnace, aiming to improve cracking efficiency and reduce costs. By suspending the radiant furnace tube support on a supporting beam and arranging the supporting beam outside the furnace chamber, the impact of high temperatures on materials is effectively avoided, thus saving expensive high-temperature alloy materials and significantly reducing costs. Simultaneously, the external design of the supporting beam allows for the installation of sliding or rolling mechanisms to accommodate the thermal displacement generated by the radiant furnace tubes operating at high temperatures, reducing thermal stress and extending equipment life. Furthermore, an innovative heat dissipation mechanism is introduced, with air intake holes at the bottom and exhaust holes at the top of the radiant furnace tube support, allowing cold air to enter, be heated, and then discharged, effectively reducing the temperature of the radiant furnace tube support and further improving equipment stability.
[0007] The purpose of this utility model is achieved as follows:
[0008] A dichloroethane cracking furnace includes a radiant chamber, a convection chamber, a chimney, and a burner. The burner is arranged on the side wall of the radiant chamber, and radiant furnace tubes are installed inside the radiant chamber. Convection coils are installed in the convection chamber, and the chimney is arranged above the convection chamber. The convection chamber is arranged directly above the radiant chamber and is connected to the radiant chamber through symmetrical flues. The top of the radiant chamber has a furnace top opening located between the symmetrical flues. The radiant furnace tubes are supported by radiant furnace tube supports, and the radiant furnace tube supports extend from the furnace top opening into the radiant chamber and are connected to a support beam.
[0009] Preferably, the support beam is equipped with a sliding or rolling mechanism.
[0010] Preferably, the radiant furnace tube support is a hollow tube, the bottom of the radiant chamber is provided with a furnace bottom air intake hole corresponding to the radiant furnace tube support, and the top of the radiant furnace tube support is provided with an exhaust hole.
[0011] Preferably, a sealing and heat-insulating structure is provided between the radiant furnace tube support and the furnace top opening.
[0012] Preferably, the radiation chamber is a span structure, with each span having symmetrical flues and furnace top openings.
[0013] Preferably, the supporting beam is made of carbon steel.
[0014] The beneficial effects of this utility model are:
[0015] By suspending the radiant furnace tube support on the support beam and placing the support beam outside the furnace chamber, the effects of high temperature on the material are avoided, thus saving expensive high-temperature alloy materials and significantly reducing costs. At the same time, the external design of the support beam allows for the installation of sliding or rolling mechanisms, which effectively absorb thermal displacement caused by high temperature, reduce thermal stress on the radiant furnace tube, and extend its service life.
[0016] The radiant furnace tube support uses hollow tubes, and an air intake is set at the bottom of the radiant furnace tube support position. Cold air enters the support through the air intake, rises after being heated, and is discharged through the exhaust hole at the top of the furnace, effectively reducing the temperature of the radiant furnace tube support, reducing the dependence on high-temperature alloy materials, and extending the service life. Attached Figure Description
[0017] Figure 1 This is a schematic diagram of an existing pyrolysis furnace.
[0018] Figure 2 This is a schematic diagram of the structure of a dichloroethane cracking furnace according to the present invention.
[0019] Figure 3 for Figure 2 A magnified view of a portion of the image.
[0020] Figure 4 This is a top view of the radiation chamber of this utility model.
[0021] The components include: 1. Radiation chamber; 2. Convection chamber; 3. Chimney; 4. Burner; 5. Radiation furnace tube; 6. Radiation furnace tube support; 7. Support beam; 8. Convection coil; 9. Symmetrical flue; 10. Furnace top opening; 11. Furnace bottom suction hole; 12. Exhaust hole; 13. Sliding or rolling mechanism. Detailed Implementation
[0022] See Figure 2-4 This utility model relates to a dichloroethane cracking furnace, including a radiant chamber 1, a convection chamber 2, a chimney 3, and a burner 4. The burner 4 is arranged on the side wall of the radiant chamber 1, and a radiant furnace tube 5 is installed inside the radiant chamber 1 for cracking dichloroethane to produce vinyl chloride monomer and hydrogen chloride. A convection coil 8 is installed in the convection chamber 2 for preheating dichloroethane and / or boiler feedwater. The chimney 3 is arranged above the convection chamber 2 for discharging flue gas. The convection chamber 2 is arranged directly above the radiant chamber 1 and is connected to the radiant chamber 1 through symmetrical flues 9. A furnace top opening 10 is provided at the top of the radiant chamber 1 between the symmetrical flues 9. The radiant furnace tube 5 is supported by a radiant furnace tube support 6. The radiant furnace tube support 6 extends out of the furnace top opening into the radiant chamber and is connected to a support beam 7. The support beam 7 is equipped with a sliding or rolling mechanism 13 to accommodate the thermal displacement generated by the radiant furnace tube 5 during operation at high temperatures.
[0023] The radiant furnace tube support is a hollow tube. A bottom air intake 11 is provided at the bottom of the radiant chamber 1 corresponding to the radiant furnace tube support 6, and an exhaust 12 is provided at the top of the radiant furnace tube support 6 to reduce its temperature and extend its service life. The exhaust 12 can be located on the top surface of the radiant furnace tube support or on the top side wall of the radiant furnace tube support, without affecting the welding of the radiant furnace tube support to the supporting beam. By providing a bottom air intake 11 at the bottom and an exhaust 12 at the top of the radiant furnace tube support, cold air is allowed to enter, exchange heat, and then be discharged, effectively reducing the temperature of the radiant furnace tube support and further improving equipment stability.
[0024] A sealing and heat-insulating structure (not shown in the figure) is provided between the radiant furnace tube support 6 and the furnace top opening 10, so that the part of the furnace tube that passes through the furnace chamber has good heat insulation and sealing. Example
[0025] The radiant chamber has a 5-span structure. At the top of the furnace in the radiant chamber 1, two symmetrical openings of 2500mm long × 400mm wide are opened in each span for connecting symmetrical flues 9. A furnace top opening 10 of 600mm long × 300mm wide is opened between the two openings for the radiant furnace tube support 6 to pass through. A supporting crossbeam 7 with a rolling mechanism is set at the furnace top opening 10.
[0026] The supporting crossbeam is made of carbon steel, and its weight (including the rolling mechanism) is 150kg. The material has been changed from HK40 to carbon steel, and the weight of a single set has been reduced from 600kg to 150kg, a reduction of up to 75%. The material of the radiant furnace tube support 6 remains unchanged (still HK40), but hollow tubes are used, and the weight of a single set has been reduced from 3600kg to 2500kg, a reduction of 30%.
[0027] In addition to the above embodiments, this utility model also includes other implementation methods. All technical solutions formed by equivalent transformation or equivalent substitution should fall within the protection scope of the claims of this utility model.
Claims
1. A dichloroethane cracking furnace, comprising a radiant chamber, a convection chamber, a chimney, and a burner, wherein the burner is arranged on the side wall of the radiant chamber, radiant furnace tubes are installed inside the radiant chamber, convection coils are installed in the convection chamber, and the chimney is arranged above the convection chamber; characterized in that: The convection chamber is located directly above the radiation chamber and is connected to the radiation chamber through symmetrical flues. The top of the radiation chamber is provided with a furnace top opening between the symmetrical flues. The radiation furnace tubes are supported by radiation furnace tube supports. The radiation furnace tube supports extend from the furnace top opening into the radiation chamber and are connected to a support beam.
2. The dichloroethane cracking furnace according to claim 1, characterized in that: The supporting beam is equipped with a sliding or rolling mechanism.
3. A dichloroethane cracking furnace according to claim 1 or 2, characterized in that: The radiant furnace tube support is a hollow tube, and the bottom of the radiant chamber is provided with a furnace bottom air intake hole corresponding to the radiant furnace tube support, while the top of the radiant furnace tube support is provided with an exhaust hole.
4. The dichloroethane cracking furnace according to claim 1, characterized in that: A sealing and heat-insulating structure is provided between the radiant furnace tube support and the opening on the furnace top.
5. A dichloroethane cracking furnace according to claim 1, characterized in that: The radiation chamber is a span structure, with each span equipped with symmetrical flues and furnace top openings.
6. The dichloroethane cracking furnace according to claim 1, characterized in that: The supporting beam is made of carbon steel.