Jacketed efficient turbulence heat transfer electric heating furnace

Abstract

The utility model discloses a jacket efficient turbulence 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 utility model belongs to the technical field of petrochemical equipment, and relates to a jacketed efficient turbulent heat transfer electric heating furnace, which is suitable for heating various process media in the fields of oil refining and chemical industry. BACKGROUND

[0002] The existing petrochemical devices mostly adopt gas heating furnaces, which have 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 furnaces can solve the environmental protection problem, but since the heating medium in the petrochemical industry is mostly oil, there is a risk of coking when local overheating occurs, which has been restricting the use of electric heating furnaces in the petrochemical industry. CONTENT OF THE UTILITY MODEL

[0003] The utility model aims at providing a jacketed efficient turbulent heat transfer electric heating furnace, which can form a turbulent flow state of fluid in the furnace through special structural design, significantly strengthen the heat transfer process, improve the heat transfer coefficient, reduce local overheating, realize uniform heating and reduce the risk of medium coking.

[0004] The utility model adopts the technical scheme that:

[0005] A jacketed efficient turbulent heat transfer electric heating furnace comprises a shell, and has the following characteristics:

[0006] A jacket is arranged on the outer side of the shell except the rear part and the 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 ends of the plurality of electric heating pipes are connected with an explosion-proof junction box through the front end of the shell;

[0008] An annular collecting pipe II is arranged on the outer side of the front part of the shell, a medium inlet is arranged on the outer side of the annular collecting pipe II, and the inner side of the annular collecting pipe II is connected with three inlet pipes arranged on the jacket and mutually forming an angle of 120º; 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 pipes;

[0009] Three main medium inlets corresponding to the inlet pipes and mutually forming an angle of 120º are formed in 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 is communicated with the inner cavity of the shell through the main medium inlets;

[0010] A sub-medium inlet is formed in the shell wall on the two 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] An annular collecting pipe I is arranged on the outer side of the rear part of the shell, a medium outlet is arranged on the outer side of the annular collecting pipe I, and the inner side of the annular collecting pipe I is connected with three outlet pipes arranged on the shell and mutually forming an angle of 120º; 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.

[0012] With the above structure, during use, 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 mainly through the main medium inlet and is heated by the electric heating pipe. Since the main medium inlet is at an angle with the shell, the entering medium is in a rotating flow state. A small amount of medium is injected into the inner cavity of the shell from the auxiliary medium inlet, 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 entire shell cavity in a turbulent flow state, increases the heat transfer coefficient, and reduces the risk of local overheating and coking. The heated medium is discharged from the outlet pipe, the annular collecting pipe II and the medium outlet.

[0013] The utility model has the advantages that:

[0014] 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.

[0015] 2. The main and auxiliary medium inlet structure is adopted, so that there is no flow "dead zone" in the entire shell, the problem of carbon deposition and coking gasification caused by local overheating of the electric heating pipe is solved, the temperature field in the entire heating cavity is more uniform, and the entire medium system runs more stably and safely.

[0016] 3. Clean and environmentally friendly: no combustion exhaust gas is generated, and no pollutants are generated.

[0017] 4. High safety: the equipment is provided with various safety protection devices, and has a high safety factor. There is no safety hazard such as gas leakage and explosion.

[0018] 5. High degree of intelligence: convenient for automatic control and remote operation, reduces manual intervention, accurate temperature control, and more easily realizes accurate temperature control to meet the process requirements with high temperature control requirements.

[0019] 6. Easy to adjust: the temperature can be adjusted by adjusting the power of the heating module, and the needs of large operation changes can be met.

[0020] 7. Quick start: can quickly start and reach the working temperature, without complicated ignition and preheating process like gas heating furnace.

[0021] 8. Simple system: there is no complex component related to the combustion system, the maintenance cost is low, and the maintenance work is relatively simple.

[0022] 9. The heating furnace of the utility model has only one heat loss, and the thermal efficiency can reach 98%. Much higher than the traditional gas heating furnace. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1The utility model discloses a structure schematic view of the utility model discloses a kind of electric heating pipe explosion-proof junction box.

[0024] Figure 2 For Figure 1 A-A sectional view of the utility model discloses a kind of electric heating pipe explosion-proof junction box.

[0025] Figure 3 For Figure 1 B-B sectional view of the utility model discloses a kind of electric heating pipe explosion-proof junction box.

[0026] Figure 4 For Figure 1 C-C sectional view of the utility model discloses a kind of electric heating pipe explosion-proof junction box.

[0027] Figure 5 For Figure 1 D-D sectional view of the utility model discloses a kind of electric heating pipe explosion-proof junction box.

[0028] 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-Ring manifold I;10-Outlet pipe;11-Jacket;12-Sliding support;13-Subordinate medium inlet;14-Fixed support;15-Primary medium inlet;16-Inlet pipe;17-Ring manifold II;18-Medium inlet;19-Control incoming line port;20-Power incoming line port;21-Outer thermal insulation layer. DETAILED DESCRIPTION

[0029] As shown in the figure, the utility model discloses a circular shell 5 of outside being equipped with thermal insulation layer 21, and the shell 5 front end is equipped with the flange cover 3 of installing multiple electric heating pipes 2, and the flange cover 3 is installed on the shell 5 through the flange 4 welded in the shell 5 front end, and the kind of foldable split structure is used, and it is convenient to install, maintain and spare replacement.

[0030] The shell 5 outside is equipped with jacket 11 except rear and front end, and the jacket 11 lower part is equipped with sliding support 12 and fixed support 14 for supporting, and the outside is equipped with outer thermal insulation layer 21, and heat loss is reduced.

[0031] Multiple electric heating pipes 2 are arranged in the cavity of the shell 5 and supported by multiple baffles 7;The electric connection end of the multiple electric heating pipes 2 is connected with the explosion-proof junction box 1 by penetrating the front end of the shell 5.

[0032] The inner core of the electric heating pipe 2 is a heating resistance wire, the outer sleeve is made of high alloy steel or appropriate material according to the characteristics of the heating medium, and magnesium oxide powder is filled between the heating resistance wire and the outer sleeve for insulation.

[0033] The explosion-proof junction box 1 can reach the explosion-proof level of DIICT4 according to the use requirement, is suitable for the high explosion-proof requirement of petrochemical industry, and can reach the protection level of IP65 and above. The explosion-proof junction box 1 is provided with a control incoming line port 19 and a power incoming line port 20, and is connected with an electric control system through the data line and the power line through the control incoming line port 19 and the power incoming line port 20, so as to supply power to the electric heating pipe, heat, receive the signals of temperature and pressure instruments and the like.

[0034] A temperature measuring element 6 is arranged at the central position of the plurality of electric heating pipes 2 in the inner cavity of the shell 5, and the rear end of the temperature measuring element 6 is arranged to pass through the front wall of the shell 5 and is connected with the explosion-proof junction box 1. In the embodiment, the temperature measuring element 6 is arranged on the flange cover 3. The temperature measuring element 6 can measure the temperature of the pipe wall of the electric heating pipe, and the over-temperature interlocking protection system is used to stop heating when the temperature exceeds the coking temperature of the medium, so as to prevent the medium from coking.

[0035] An annular collecting pipe II 17 is arranged outside the jacket 11 of the front part of the shell 5, a medium inlet 18 is arranged outside the annular collecting pipe II 17, and the inner side of the annular collecting pipe II 17 is connected with three inlet pipes 16 arranged on the jacket 11 and intersecting 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.

[0036] Three main medium inlets 15 corresponding to the inlet pipes 16 are formed in the front part of the shell 5 and intersect at an angle of 120°, and the main medium inlets 15 are arranged at an 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.

[0037] A secondary medium inlet 13 is formed in the shell wall on each side of the bottom of the baffle plate 7, and the inner cavity of the jacket 11 is communicated with the inner cavity of the shell 5 through the secondary medium inlet 13.

[0038] An annular collecting pipe I 9 is arranged outside the rear part of the shell 5, a medium outlet 8 is arranged outside the annular collecting pipe I 9, and the inner side of the annular collecting pipe I 9 is connected with three outlet pipes 10 arranged on the shell 5 and intersecting 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.

[0039] Thermocouples are arranged outside the medium outlet 8 and the medium inlet 18, and the power of the electric heating pipe can be adjusted in time through the temperature of the inlet and outlet, so as to achieve the purpose of precisely heating the medium.

[0040] The explosion-proof junction box 1 can be vertical or horizontal, and for the heating medium with high load demand, a plurality of devices can be connected in series or parallel to obtain high power. The power of the explosion-proof junction box 1 can theoretically range from zero to infinity.

Claims

1. A jacketed high-efficiency turbulent heat transfer electric heating furnace, comprising a shell (5), characterized in that: the shell (5) is provided with a jacket (11) on the outer side thereof 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 electrically connected ends of the plurality of electric heating pipes (2) are led out from the front end of the shell (5) and connected to an explosion-proof junction box (1); an annular collecting pipe II (17) is arranged on the outer side of the jacket (11) at the front part of the shell (5), the annular collecting pipe II (17) is provided with a medium inlet (18) on the outer side thereof and connected to three inlet pipes (16) arranged on the jacket (11) and mutually at an angle of 120° on the inner side thereof; 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); three main medium inlets (15) corresponding to the inlet pipes (16) and mutually at an angle of 120° are formed in the front part of the shell (5), the main medium inlets (15) are 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 inlets (13); an annular collecting pipe I (9) is arranged on the outer side of the rear part of the shell (5), the annular collecting pipe I (9) is provided with a medium outlet (8) on the outer side thereof and connected to three outlet pipes (10) arranged on the shell (5) and mutually at an angle of 120° on the inner side thereof; 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).

2. A jacketed high efficiency turbulent heat transfer electrically heated furnace as claimed in claim 1, wherein: a sliding support (12) and a fixed support (14) for support are arranged on the lower part of the jacket (11).

3. The electrically heated furnace of claim 1 wherein: an outer thermal insulation layer (21) is arranged on the outer side of the shell (5) and the jacket (11).

4. The electrically heated furnace of claim 1 wherein: a control inlet (19) and a power inlet (20) are arranged on the explosion-proof junction box (1), the explosion-proof junction box (1) is connected to an electric control system through a data line and a power line through the control inlet (19) and the power inlet (20).

5. The electrically heated furnace of claim 1 wherein: a temperature measuring element (6) is arranged in the inner cavity of the shell (5) at the central position of the plurality of electric heating pipes (2), the temperature measuring element (6) is fixed on the front wall of the shell (5) and the rear end thereof is led out from the front wall of the shell (5) and connected to the explosion-proof junction box (1).

6. A jacketed high efficiency turbulent heat transfer electrically heated furnace as claimed in claim 1, wherein: thermocouples are arranged on the outer sides of the medium outlet (8) and the medium inlet (18).

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