Efficient turbulence heat transfer electric heating furnace

Abstract

The utility model discloses an 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, an outlet pipe and a central injection pipe. By the adoption of the structure, during use, most of media entering the inner cavity of the jacket through the medium inlet, the annular collecting pipe II and the inlet pipe enter the inner cavity of the shell through the main medium inlet and are 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. A small amount of medium is sprayed from the small holes of the central injection pipe to the periphery, and the medium turbulence state and heat transfer at the center are also increased.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of petrochemical equipment, and relates to a high -efficient turbulent heat transfer electric heating furnace, is applicable to the heating of various process medium in the field such as oil refining, chemical industry. BACKGROUND

[0002] The existing petrochemical device adopts gas heating furnace, and there are a series of problems such as high fuel consumption, large carbon emission, nitrogen oxide pollutant emission, low environmental protection index and high energy consumption index. The use of electric heating furnace can solve the environmental protection problem, but since the heating medium in the petrochemical industry is mostly oil, when local overheating occurs, there is a risk of coking, which has been restricting the use of electric heating furnace in the petrochemical industry. CONTENT OF THE UTILITY MODEL

[0003] The utility model discloses a kind of high-efficiency turbulent heat transfer electric heating furnaces, and the electric heating furnace can make fluid in furnace form turbulent state by special structure design, significantly strengthen heat transfer process, improve heat transfer coefficient, reduce local overheating, realize uniform heating, reduce medium coking risk.

[0004] The utility model discloses the technical scheme for being adopted as follows:

[0005] A kind of high-efficiency turbulent heat transfer electric heating furnace including shell, its characteristics are:

[0006] The shell outside is provided with a jacket except rear and front end;

[0007] A plurality of electric heating pipes supported by a plurality of baffles are arranged in the inner cavity of the shell;The power connection end of the plurality of electric heating pipes is connected with the explosion-proof terminal box through the front end of the shell;

[0008] The outer side of the jacket of the front part of the shell is provided with an annular collecting pipe II, the outer side of the annular collecting pipe II is provided with a medium inlet, and the inner side is connected with three inlet pipes arranged on the jacket and mutually forming an angle of 120°. The medium inlet is communicated with the inner cavity of the jacket through the inner cavity of the annular collecting pipe II and the inlet pipe.

[0009] Three main medium inlets corresponding to the inlet pipes and mutually forming an angle of 120° are opened in the front part of the shell, and the main medium inlet forms a certain angle with the shell wall. The inner cavity of the jacket is communicated with the inner cavity of the shell through the main medium inlet.

[0010] A sub-medium inlet is opened on the shell wall on both sides of the bottom of each baffle, and the inner cavity of the jacket is communicated with the inner cavity of the shell through the sub-medium inlet.

[0011] A center injection pipe supported on the plurality of baffles is arranged at the center position of the inner cavity of the shell. The front end of the center injection pipe is closed, and the rear end is communicated with the annular collecting ring pipe II through the rear end of the shell. Small holes for spraying in all directions are opened on the pipe wall of the center injection pipe in the inner cavity of the shell.

[0012] The rear part of the shell is provided with an annular collecting pipe I, and the outer side of the annular collecting pipe I is provided with a medium outlet, and the inner side is connected with three outlet pipes arranged on the shell and mutually forming an angle of 120°; the inner cavity of the shell is communicated with the medium outlet through the outlet pipes and the inner cavity of the annular collecting pipe I.

[0013] By using the above structure, when in use, the medium entering the inner cavity of the jacket through the medium inlet, the annular collecting pipe II and the inlet pipe mainly enters the inner cavity of the shell through the main medium inlet and is heated by the electric heating pipe. Since the main medium inlet forms a certain angle with the shell, the entering medium forms a rotating flow state. A small part of the medium enters the inner cavity of the shell from the auxiliary medium inlet and disturbs the flow dead zone on both sides of the baffle, reduces the residence time of the material in the area, makes the fluid in the whole shell be in a turbulent flow state, increases the heat transfer coefficient, and reduces the risk of local overheating and coking. A small amount of medium is sprayed from the small holes of the center injection pipe to the surrounding, which also increases the turbulent flow state of the medium and the heat transfer at the center. The heated medium is discharged from the outlet pipe, the annular collecting pipe II and the medium outlet.

[0014] The utility model has the following advantages:

[0015] 1. The medium rotates and flows quickly in the heater shell, the flow rate is faster, the heat transfer coefficient is higher, the problem of carbon deposition and coking on the electric heating pipe is solved, the electric heating pipe can exchange heat more effectively, and has a longer service life.

[0016] 2. The main, auxiliary medium inlet and center injection pipe structure are adopted, so that there is no flow "dead zone" in the whole shell, the problems of carbon deposition and coking caused by local overheating of the electric heating pipe are solved, the temperature field in the whole heating cavity is more uniform, and the whole medium system runs more stably and safely.

[0017] 3. Clean and environmentally friendly: no combustion exhaust gas is generated, and no pollutants are generated.

[0018] 4. High safety: the equipment is provided with various safety protection devices, and has high safety factor. There is no safety hidden danger such as gas leakage and explosion.

[0019] 5. High degree of intelligence: convenient for automatic control and remote operation, reduces manual intervention. Precise temperature control, which is easier to realize accurate temperature control, meets the process demand with high temperature control requirement.

[0020] 6. Easy to adjust: the temperature can be adjusted by adjusting the power of the heating module, which can meet the needs of large operation changes.

[0021] 7. Quick start: it can quickly start and reach working temperature, without complicated ignition and preheating process like gas heating furnace.

[0022] 8. The system is simple: there is no combustion system related complex components, low maintenance cost and maintenance work is relatively simple.

[0023] 9. The heating furnace has only one heat loss, and the thermal efficiency can reach 98%. It is much larger than that of the traditional gas heating furnace. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is a structure schematic view of the utility model;

[0025] Figure 2 It is Figure 1 A-A sectional view of the utility model;

[0026] Figure 3 It is Figure 1 B-B sectional view of the utility model;

[0027] Figure 4 It is Figure 1 C-C sectional view of the utility model;

[0028] Figure 5 It is Figure 1 D-D sectional view of the utility model.

[0029] In the drawing: 1 - explosion-proof junction box; 2 - electric heating pipe; 3 - flange cover; 4 - flange; 5 - shell; 6 - temperature measuring element; 7 - baffle; 8 - medium outlet; 9 - annular manifold I; 10 - outlet pipe; 11 - jacket; 12 - sliding support; 13 - auxiliary medium inlet; 14 - fixed support; 15 - main medium inlet; 16 - inlet pipe; 17 - annular manifold II; 18 - medium inlet; 19 - control inlet; 20 - power inlet; 21 - outer insulation layer; 22 - central injection pipe. DETAILED DESCRIPTION

[0030] As shown in the drawing, the utility model includes the circular shell 5 of the outer side provided with the insulation layer 21, the flange cover 3 provided with the plurality of electric heating pipes 2 is arranged at the front end of the shell 5, the flange cover 3 is arranged on the shell 5 through the flange 4 welded at the front end of the shell 5, and the split structure of the foldable type is adopted, so that installation, maintenance and part replacement are facilitated.

[0031] The jacket 11 is arranged on the outer side of the shell 5 except the rear part and the front end, the sliding support 12 and the fixed support 14 for supporting are arranged at the lower part of the jacket 11, and the outer insulation layer 21 is arranged on the outer side, so that heat loss is reduced.

[0032] The plurality of electric heating pipes 2 supported by the plurality of baffles 7 are arranged in the inner cavity of the shell 5; the electric connection end of the plurality of electric heating pipes 2 is connected with the explosion-proof junction box 1 through the front end of the shell 5.

[0033] 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.

[0034] The explosion-proof junction box 1 can reach the explosion-proof level of DIICT4 according to the use requirements, is suitable for the high explosion-proof requirements of the petrochemical industry, and can reach the protection level of IP65 or above. The explosion-proof junction box 1 is provided with a control inlet 19 and a power inlet 20, and is connected with the electric control system through the data line and the power line through the control inlet 19 and the power inlet 20, so as to supply power to the electric heating tube, heat, and receive signals of temperature and pressure instruments.

[0035] A temperature measuring element 6 is arranged in the inner cavity of the shell 5 and close to the electric heating tube 2. The temperature measuring element 6 is fixed on the front wall of the shell 5 and the rear end thereof is arranged outside the front wall of the shell 5 and connected with the explosion-proof junction box 1. In this embodiment, the temperature measuring element 6 is arranged on the flange cover 3. The temperature measuring element 6 can measure the temperature of the tube wall of the electric heating tube, and the over-temperature interlocking protection system stops heating when the temperature exceeds the medium coking temperature, so as to prevent medium coking.

[0036] An annular collecting pipe II 17 is arranged outside the jacket 11 of the front part of the shell 5. The annular collecting pipe II 17 is provided with a medium inlet 18 outside and connected with three inlet pipes 16 arranged on the jacket 11 and mutually arranged at an angle of 120° inside. The medium inlet 18 is communicated with the inner cavity of the jacket 11 through the inner cavity of the annular collecting pipe II 17 and the inlet pipes 16.

[0037] Three main medium inlets 15 corresponding to the inlet pipes 16 and mutually arranged at an angle of 120° are formed in the front part of the shell 5. The main medium inlets 15 are arranged at a certain angle with the shell wall. The inner cavity of the jacket 11 is communicated with the inner cavity of the shell 5 through the main medium inlets 15.

[0038] A secondary medium inlet 13 is formed in the shell wall on both sides of the bottom of each baffle plate 7. The inner cavity of the jacket 11 is communicated with the inner cavity of the shell 5 through the secondary medium inlets 13.

[0039] A central injection pipe 22 supported on the plurality of baffle plates 7 is arranged at the central position of the inner cavity of the shell 5. The central injection pipe 22 is closed at the front end and communicated with the annular collecting pipe II 17 through the rear end flange of the shell 5. Small holes for spraying in all directions are formed in the pipe wall of the central injection pipe 22 in the inner cavity of the shell 5.

[0040] An annular collecting pipe I 9 is arranged outside the rear part of the shell 5. The annular collecting pipe I 9 is provided with a medium outlet 8 outside and connected with three outlet pipes 10 arranged on the shell 5 and mutually arranged at an angle of 120° inside. The inner cavity of the shell 5 is communicated with the medium outlet 8 through the outlet pipes 10 and the inner cavity of the annular collecting pipe I 9.

[0041] The medium outlet 8 and the medium inlet 18 are externally provided with thermocouples, and the power of the electric heating pipe can be timely adjusted through the temperature of the outlet and inlet, so that the medium is precisely heated.

[0042] The utility model discloses can be vertical or horizontal, for the heating medium of high load demand, can be in series or parallel multiple to obtain high power. The power of the utility model can theoretically from zero to infinity.

Claims

1. A high-efficiency turbulent heat transfer electric heating furnace, comprising a shell (5), characterized in that: the outer side of the shell (5) is provided with a jacket (11) except for the rear part and the front end; a plurality of electric heating pipes (2) supported by a plurality of baffles (7) are arranged in the inner cavity of the shell (5); the electric heating pipe (2) is connected with the explosion-proof junction box (1) through the front end of the shell (5); the outer side of the jacket (11) of the front part of the shell (5) is provided with an annular collecting pipe II (17), the outer side of the annular collecting pipe II (17) is provided with a medium inlet (18), and the inner side is connected with three inlet pipes (16) arranged on the jacket (11) and mutually arranged at 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 collecting pipe II (17) and the inlet pipe (16); three main medium inlets (15) corresponding to the inlet pipe (16) and mutually arranged at an angle of 120° are formed in the front part of the shell (5), the main medium inlets (15) are arranged at a certain angle with the shell wall; the inner cavity of the jacket (11) is communicated with the inner cavity of the shell (5) through the main medium inlets (15); a secondary medium inlet (13) is formed in the shell wall on both sides of the bottom of each baffle (7), the inner cavity of the jacket (11) is communicated with the inner cavity of the shell (5) through the secondary medium inlet (13); a central injection pipe (22) supported by the plurality of baffles (7) is arranged at the central position of the inner cavity of the shell (5); the front end of the central injection pipe (22) is closed, the rear end is communicated with the annular collecting ring pipe II (17) through the rear end of the shell (5); a plurality of small holes for injection in all directions are formed in the pipe wall of the central injection pipe (22) in the inner cavity of the shell (5); an annular collecting pipe I (9) is arranged on the outer side of the rear part of the shell (5), the outer side of the annular collecting pipe I (9) is provided with a medium outlet (8), and the inner side is connected with three outlet pipes (10) arranged on the shell (5) and mutually arranged at an angle of 120°; the inner cavity of the shell (5) is communicated with the medium outlet (8) through the outlet pipe (10) and the inner cavity of the annular collecting pipe I (9). The lower part of the jacket (11) is provided with a sliding support (12) and a fixed support (14) for supporting. The outer side of the shell (5) and the jacket (11) is provided with an outer thermal insulation layer (21). The explosion-proof junction box (1) is provided with a control inlet (19) and a power inlet (20), and the explosion-proof junction box (1) is connected with the electric control system through the data line and the power line through the control inlet (19) and the power inlet (20). A temperature measuring element (6) is arranged in the inner cavity of the shell (5) near the electric heating pipe (2), the temperature measuring element (6) is fixed on the front wall of the shell (5), and the rear end is connected with the explosion-proof junction box (1) through the front wall of the shell (5). The medium outlet (8) and the medium inlet (18) are provided with a thermocouple. ​ ​ 2. A high efficiency turbulent heat transfer electrically heated furnace as claimed in claim 1 wherein: ​ 3. The high efficiency turbulent heat transfer electric heater of claim 1 wherein: ​ 4. The high efficiency turbulent heat transfer electric heater of claim 1 wherein: ​ 5. The high efficiency turbulent heat transfer electric heater of claim 1 wherein: ​ 6. A high efficiency turbulent heat transfer electrically heated furnace as claimed in claim 1 wherein: ​

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