Jacketed efficient turbulence heat transfer electric heating furnace

Abstract

The invention discloses a jacket efficient turbulent flow heat transfer electric heating furnace which comprises a shell, a jacket, an electric heating pipe, a baffle plate, an anti-explosion junction box, an annular collecting pipe II, an inlet pipe, a main medium inlet, an auxiliary medium inlet, an annular collecting pipe I and an outlet pipe. Most of the medium entering the inner cavity of the jacket through the medium inlet, the annular collecting pipe II and the inlet pipe enters the inner cavity of the shell through the main medium inlet and is heated by the electric heating pipe. The main medium inlet and the shell form a certain angle, so that the entering medium is in a rotary flowing state; a small part of medium is jetted into the inner cavity of the shell from the auxiliary medium inlet to disturb flowing dead areas on the two sides of the baffle plate, the retention time of materials in the areas is shortened, fluid in the whole shell is in a turbulent flow state, the heat transfer coefficient is increased, and the risk of local overheating and coking is reduced. And the heated medium is discharged from the outlet pipe, the annular collecting pipe II and the medium outlet.

Description

Technical Field

[0001] The present invention belongs to the technical field of petrochemical equipment, and relates to a jacketed high-efficiency turbulent flow electric heating furnace, which is applicable to the heating of various process media in the fields of oil refining, chemical industry, etc. Background Art

[0002] Most existing petrochemical plants use gas heating furnaces, which have a series of problems such as high fuel consumption, large carbon emissions, and emissions of nitrogen oxide pollutants, with low environmental protection indicators and high energy consumption indicators. Using an electric heating furnace can solve the environmental protection problem, but since the heating medium in the petrochemical industry is mostly oil products, there is a risk of coking when there is local overheating, which has been restricting the use of electric heating furnaces in the petrochemical industry. Summary of the Invention

[0003] The purpose of the present invention is to provide a jacketed high-efficiency turbulent flow electric heating furnace, which can make the fluid in the furnace form a turbulent state through a special structural design, significantly strengthen the heat transfer process, increase the heat transfer coefficient, reduce local overheating, achieve uniform heating, and reduce the risk of medium coking.

[0004] The technical solution adopted by the present invention is as follows:

[0005] A jacketed high-efficiency turbulent flow electric heating furnace includes a shell, and is characterized in that:

[0006] Jackets are provided on the outer side of the shell except for the rear part and the front end;

[0007] A plurality of electric heating tubes supported by a plurality of baffle plates are arranged in the inner cavity of the shell; the power connection ends of the plurality of electric heating tubes pass through the front end of the shell and are connected to an explosion-proof junction box;

[0008] An annular manifold II is provided on the outer side of the jacket at the front part of the shell, a medium inlet is provided on the outer side of the annular manifold II, and the inner side is connected to three inlet pipes provided on the jacket and mutually forming an angle of 120°; the medium inlet communicates with the inner cavity of the jacket through the inner cavity of the annular manifold II and the inlet pipes;

[0009] Three main medium inlets corresponding to the inlet pipes and mutually forming an angle of 120° are opened at the front part of the shell, and the main medium inlets form a certain angle with the shell wall; the inner cavity of the jacket communicates with the inner cavity of the shell through the main medium inlets;

[0010] Auxiliary medium inlets are opened on the shell walls on both sides at the bottom of each baffle plate, and the inner cavity of the jacket communicates with the inner cavity of the shell through the auxiliary medium inlets;

[0011] An annular manifold I is provided on the outer side of the rear part of the shell, a medium outlet is provided on the outer side of the annular manifold I, and the inner side is connected to three outlet pipes provided on the shell and mutually forming an angle of 120°; the inner cavity of the shell communicates with the medium outlet through the outlet pipes and the inner cavity of the annular manifold I.

[0012] With the above structure, during use, the medium that enters the inner cavity of the jacket through the medium inlet, the annular manifold II, and the inlet pipe, most of it enters the inner cavity of the shell through the main medium inlet and is heated by the electric heating tubes. Since the main medium inlet forms a certain angle with the shell, the entering medium is in a swirling flow state; a small part of the medium is sprayed into the inner cavity of the shell from the secondary medium inlet, disturbing the stagnant flow areas on both sides of the baffle plate, reducing the residence time of the material in this area, making the fluid in the entire shell in a turbulent state, increasing the heat transfer coefficient, and reducing the risk of local overheating and coking. The heated medium is discharged from the outlet pipe, the annular manifold II, and the medium outlet.

[0013] The present invention has the following advantages:

[0014] 1. The medium rotates and flows rapidly in the heater shell, with a faster flow rate and a higher heat transfer coefficient, solving the problem of carbon deposition and coking on the electric heating tubes, enabling the electric heating tubes to exchange heat more effectively and having a longer service life.

[0015] 2. The adopted main and secondary medium inlet structures ensure that there is no stagnant flow "dead zone" in the entire shell, solving the problem of carbon deposition, coking, and gasification caused by local overheating of the electric heating tubes. Making the temperature field in the entire heating cavity more uniform. The entire medium system operates more smoothly and safely.

[0016] 3. It meets the policy requirements of the country's future consumption of green electricity.

[0017] 4. It achieves zero carbon emissions and actively responds to the country's carbon emission reduction requirements.

[0018] 5. Clean and environmentally friendly: It does not produce combustion exhaust gas and does not produce any pollutants.

[0019] 6. High safety: The equipment is equipped with various safety protection devices, with a high safety factor. And there are no safety hazards such as gas leakage and explosion.

[0020] 7. High degree of intelligence: It is convenient to achieve automatic control and remote operation, reducing manual intervention. Precise temperature control is adopted, and it is easier to achieve precise temperature control, meeting the process requirements with high temperature control requirements.

[0021] 8. Convenient adjustment: The temperature can be adjusted by adjusting the power of the heating module, which can meet the needs of large operating changes.

[0022] 9. Quick start: It can be quickly started and reach the working temperature, without the cumbersome ignition and preheating processes like a gas heating furnace.

[0023] 10. Simple system: It does not have complex components related to the combustion system, with relatively low maintenance costs and relatively simple maintenance work.

[0024] 11. The heating furnace of the present invention has only one heat loss, and the thermal efficiency can reach 98%, which is much higher than that of traditional gas heating furnaces. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic structural diagram of the present invention;

[0026] Figure 2 is Figure 1 the A-A cross-sectional view of

[0027] Figure 3 is Figure 1 the B-B cross-sectional view of

[0028] Figure 4 is Figure 1 the C-C cross-sectional view of

[0029] Figure 5 is Figure 1 the D-D cross-sectional view of

[0030] In the figures: 1 - explosion-proof junction box; 2 - electric heating tube; 3 - flange cover; 4 - flange; 5 - shell; 6 - temperature measuring element; 7 - baffle plate; 8 - medium outlet; 9 - annular manifold I; 10 - outlet pipe; 11 - jacket; 12 - sliding support; 13 - secondary medium inlet; 14 - fixed support; 15 - main medium inlet; 16 - inlet pipe; 17 - annular manifold II; 18 - medium inlet; 19 - control incoming line port; 20 - power incoming line port; 21 - outer insulation layer. DETAILED DESCRIPTION OF THE INVENTION

[0031] As shown in the figure, the present invention includes a circular shell 5 with an outer insulation layer 21 provided on the outside thereof. At the front end of the shell 5, there is a flange cover 3 equipped with a plurality of electric heating tubes 2. The flange cover 3 is installed on the shell 5 through a flange 4 welded to the front end of the shell 5. Adopting this detachable split structure facilitates installation, maintenance, and component replacement.

[0032] A jacket 11 is provided on the outside of the shell 5 except for the rear and front ends. A sliding support 12 and a fixed support 14 for support are provided at the lower part of the jacket 11, and an outer insulation layer 21 is provided on the outside to reduce heat loss.

[0033] A plurality of electric heating tubes 2 supported by a plurality of baffle plates 7 are provided in the inner cavity of the shell 5; the power connection ends of the plurality of electric heating tubes 2 pass through the front end of the shell 5 and are connected to the explosion-proof junction box 1.

[0034] The inner core of the electric heating tube 2 is a heating resistance wire, and the outer sleeve is made of high alloy steel or a suitable material selected according to the characteristics of the heating medium. Magnesium oxide powder is filled between the heating resistance wire and the outer sleeve for insulation.

[0035] The explosion-proof junction box 1 can achieve an explosion-proof rating of DII CT4 according to the usage requirements, which is applicable to the high explosion-proof requirements of the petrochemical industry, and the protection rating can reach IP65 or above. The explosion-proof junction box 1 is provided with a control inlet 19 and a power supply inlet 20. The explosion-proof junction box 1 is connected to the electric control system through a data line and a power line via the control inlet 19 and the power supply inlet 20 to supply power to the electric heating tube to generate heat and receive signals from instruments such as temperature and pressure.

[0036] Inside the inner cavity of the housing 5 and at the central position of multiple electric heating tubes 2, a temperature measuring element 6 is provided, and the rear end of the temperature measuring element passes through the front wall of the housing 5 and is connected to the explosion-proof junction box 1. In this embodiment, it is installed on the flange cover 3. The temperature measuring element 6 can measure the wall temperature of the electric heating tube. Through the overtemperature interlock protection system, when the temperature exceeds the coking temperature of the medium, the heating is stopped to prevent the medium from coking.

[0037] On the outer side of the jacket 11 at the front part of the housing 5, an annular manifold II 17 is provided. On the outer side of the annular manifold II 17, a medium inlet 18 is provided, and on the inner side, it is connected to three inlet pipes 16 provided on the jacket 11 and mutually forming an angle of 120°; the medium inlet 18 communicates with the inner cavity of the jacket 11 through the inner cavity of the annular manifold II 17 and the inlet pipes 16.

[0038] At the front part of the housing 5, three main medium inlets 15 corresponding to the inlet pipes 16 and mutually forming an angle of 120° are opened, and the main medium inlets 15 form a certain angle with the housing wall; the inner cavity of the jacket 11 communicates with the inner cavity of the housing 5 through the main medium inlets 15.

[0039] On the housing walls on both sides at the bottom of each baffle 7, auxiliary medium inlets 13 are opened, and the inner cavity of the jacket 11 communicates with the inner cavity of the housing 5 through the auxiliary medium inlets 13;

[0040] On the outer side of the rear part of the housing 5, an annular manifold I 9 is provided. On the outer side of the annular manifold I 9, a medium outlet 8 is provided, and on the inner side, it is connected to three outlet pipes 10 provided on the housing 5 and mutually forming an angle of 120°; the inner cavity of the housing 5 communicates with the medium outlet 8 through the outlet pipes 10 and the inner cavity of the annular manifold I 9.

[0041] Thermocouples are provided outside the medium outlet 8 and the medium inlet 18, and the power of the electric heating tube can be adjusted in a timely manner through the inlet and outlet temperatures to achieve the purpose of precisely heating the medium.

[0042] The present invention can be vertical or horizontal. For heating media with high load requirements, multiple units can be connected in series or in parallel to obtain high power. The power of the present invention can theoretically range from zero to infinity.

Claims

1. A jacketed high-efficiency turbulent heat transfer electric heating furnace, which includes a housing (5), and is characterized in that: A jacket (11) is provided on the outer side of the housing (5) except for the rear and front ends; A plurality of electric heating tubes (2) supported by a plurality of baffle plates (7) are provided in the inner cavity of the housing (5); the power connection ends of the plurality of electric heating tubes (2) pass through the front end of the housing (5) and are connected to an explosion-proof junction box (1); An annular manifold II (17) is provided on the outer side of the jacket (11) at the front of the housing (5). A medium inlet (18) is provided on the outer side of the annular manifold II (17), and the inner side is connected to three inlet pipes (16) provided on the jacket (11) and mutually forming an angle of 120°; the medium inlet (18) is communicated with the inner cavity of the jacket (11) through the inner cavity of the annular manifold II (17) and the inlet pipes (16); Three main medium inlets (15) corresponding to the inlet pipes (16) and mutually forming an angle of 120° are provided at the front of the housing (5), and the main medium inlets (15) form a certain angle with the housing wall; the inner cavity of the jacket (11) is communicated with the inner cavity of the housing (5) through the main medium inlets (15); Auxiliary medium inlets (13) are provided on the housing walls on both sides of the bottom of each baffle plate (7), and the inner cavity of the jacket (11) is communicated with the inner cavity of the housing (5) through the auxiliary medium inlets (13); An annular manifold I (9) is provided on the outer side of the rear of the housing (5). A medium outlet (8) is provided on the outer side of the annular manifold I (9), and the inner side is connected to three outlet pipes (10) provided on the housing (5) and mutually forming an angle of 120°; the inner cavity of the housing (5) is communicated with the medium outlet (8) through the outlet pipes (10) and the inner cavity of the annular manifold I (9); 2. The high-efficiency turbulent flow heat transfer jacketed electric heating furnace according to claim 1, wherein: Sliding supports (12) and fixed supports (14) for support are provided at the lower part of the jacket (11); 3. The high-efficiency turbulent heat transfer electric heating furnace with a jacket according to claim 1, characterized in that: Outer thermal insulation layers (21) are provided on the outer sides of the housing (5) and the jacket (11); 4. A jacketed high-efficiency turbulent heat transfer electric heating furnace according to claim 1, characterized in that: A control inlet (19) and a power supply inlet (20) are provided on the explosion-proof junction box (1), and the explosion-proof junction box (1) is connected to an electric control system through a data line and a power line via the control inlet 19 and the power supply inlet 20; 5. The high-efficiency turbulent heat transfer jacketed electric heating furnace according to claim 1, characterized in that: in A temperature measuring element (6) is provided at the central position of the plurality of electric heating tubes (2) in the inner cavity of the housing (5). The temperature measuring element (6) is fixed on the front wall of the housing (5), and its rear end passes through the front wall of the housing (5) and is connected to the explosion-proof junction box (1); 6. The high-efficiency turbulent heat transfer jacketed electric heating furnace according to claim 1, characterized in that: Thermocouples are provided outside the medium outlet (8) and the medium inlet (18).

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