CN112738934A

CN112738934A - Fused salt electric heater

Info

Publication number: CN112738934A
Application number: CN202110087528.7A
Authority: CN
Inventors: 季成富; 段晓伟; 李鸿宇
Original assignee: Zhenjiang Yutai Explosion Proof Electric Heater Co ltd
Current assignee: Zhenjiang Yutai Explosion Proof Electric Heater Co ltd
Priority date: 2021-01-22
Filing date: 2021-01-22
Publication date: 2021-04-30

Abstract

The invention particularly relates to a molten salt electric heater, which belongs to the technical field of machinery. The structure of the present invention includes a container cylinder connected to the electric heater junction box, the container cylinder has a container head at the tail, the container head is provided with a medium inlet, and the top is provided with a medium outlet. An electric heating element is arranged inside the body, and the electric heating element passes through the tube plate flange located at the head of the container cylinder and is sleeved with the casing of the heat dissipation area, and the conductive end of the electric heating element is electrically connected with the junction box. A sheath tube through which the heating element can pass is arranged in the cylinder, and sealing plates are respectively provided in the container cylinder at the rear end near the tube sheet flange and at the front end close to the container head. The beneficial effects are: simple and convenient installation, fast process temperature rise, no heating blind zone, and significantly improved operation effect; meanwhile, the manufacturing cost is much less, and the service life of the electric heating element is greatly extended under the premise of ensuring the insulation performance of the electric heating element.

Description

Fused salt electric heater

Technical Field

The invention relates to an electric heater, in particular to a molten salt electric heater, and belongs to the technical field of machinery.

Background

Nowadays, the rapid development of industrialization is fast, and the fields of petroleum and chemical industry increasingly relate to molten salt heating equipment, such as evergreen and red chemical industry, tay-brandy-yland chemical industry, Shandong-Kaitai, Zhejiang-Jiaxing satellite chemical industry and other units are put into use. But the method has the problems that the required equipment has higher heating energy consumption, the power is about 500-1000 KW or more, an austenitic stainless steel pipe (TP 321) in the container directly heats flowing molten salt, the quantity is dense, the heating density is not more than 3W/cm2, the diameter of the container is increased or the length of the container is lengthened, the equipment body is oversized, the field installation of a user is difficult, and the process operation is also disadvantageous; and the manufacturing cost is also high. In conclusion, the existing molten salt electric heater has the problems of multiple defects, poor thermal efficiency, high cost, weak market competition advantages and the like, and the existing market competition is very strong, so that the original product design concept cannot meet the market demand.

Disclosure of Invention

The invention aims to provide a molten salt electric heater aiming at the defects in the prior art and meeting the market demand.

The invention solves the technical problem by the following technical scheme: the utility model provides a fused salt electric heater, includes the vessel barrel of being connected with the electric heater terminal box, the afterbody of vessel barrel has the container head, be equipped with the medium import on the container head, the top is equipped with the medium export, electric heating element is settled to the inside of vessel barrel, electric heating element passes the tube sheet flange that is located vessel barrel head and cup joints with the radiating area sleeve pipe, electric heating element's electrically conductive end with the terminal box electricity is connected, settle the protecting pipe that can supply electric heating element to pass in the vessel barrel, be close to in the vessel barrel the rear end of tube sheet flange and be close to the front end of container head is equipped with the shrouding respectively.

The electric heating element is a U-shaped electric heating tube, and a straight section of the U-shaped electric heating tube is sleeved with a protective sleeve.

The sleeve is supported by a fixing piece, and the fixing piece is composed of a fixing pull rod and a fixing plate perpendicular to the fixing pull rod.

The electric heating tube comprises at least two U-shaped electric heating tubes, the opening ends of the U-shaped electric heating tubes face to a tube plate flange, and a fixed pull rod is arranged between sleeves close to the top and the bottom of a container barrel.

The rear end sealing plate of the tube plate flange is a front sealing plate, and the front end sealing plate of the container end enclosure is a rear sealing plate.

The protective sleeve is fixed between the front sealing plate and the rear sealing plate, two ends of the protective sleeve penetrate through the front sealing plate and the rear sealing plate respectively, and the protective sleeve is in full-welding connection with the front sealing plate, the rear sealing plate and the container barrel.

A gap is formed between the protective sleeve and the U-shaped electric heating tube, and the gap is more than or equal to 2.5 mm. The heat exchange effect brought by heat flow is realized.

And the head of the container cylinder body is fixed with a container flange, and the container flange is attached to the tube plate flange.

And a sewage draining outlet is formed in the bottom of the container barrel.

The bottom of the container cylinder is connected with a container support used for supporting the cylinder.

The common electric heater with the sheath adopts a mode that the outer surface of the electric heating tube is provided with the sheath, a heating medium is positioned outside the sheath, the electric heating tube is not contacted with the medium, and the heat of the electric heating tube is transferred to the medium outside the sheath through the sheath by heat conduction. The electric heating tube is arranged in the protective sleeve, the gap is large, and liquid or gas flows rapidly through the gap between the electric heating tube and the protective sleeve to take away heat emitted by the electric heating tube. The electric heating tube of the invention is directly contacted with the heating medium, thus avoiding the problems that the prior fused salt electric heater directly heats fused salt through the electric heating tube without a sheath, the heating efficiency is poor, the energy consumption is high and the temperature rise is slow. The structure of this application has increased the medium flow rate between electrothermal tube and sheath, and the intensification is with higher speed, and the heat that gives out to the electrothermal tube is taken away to fast flow.

The invention amplifies the heating density of the electric heater to 5W/cm²About, container diameter reduces or length shortens, and the equipment bodily form obviously dwindles, its beneficial effect: the user is simple and convenient to install on site, the process is fast in temperature rise, no heating blind area exists, and the operation effect is obviously improved; meanwhile, the manufacturing cost is low, the manufacturing cost is high, and the service life of the electric heating element is greatly prolonged on the premise of ensuring the insulating property of the electric heating element.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment of the present invention.

Fig. 2 is a partial structural schematic diagram of fig. 1.

Detailed Description

Example 1

The structure of the embodiment is as shown in fig. 1 and fig. 2, and the molten salt electric heater comprises an electric heater junction box 1 (cable lead-in chamber), a heat dissipation area sleeve 2, a tube plate flange 3, a pressure vessel flange 4, a front sealing plate 5, a protecting sleeve 6, a U-shaped electric heating tube 7, a rear sealing plate 8, a vessel end enclosure 9, a vessel cylinder 12, a medium inlet 10 and a medium outlet 11. The electric heating device comprises a container barrel 12 connected with an electric heater junction box, a container end enclosure 9 is arranged at the tail of the container barrel 12, a medium inlet 10 is formed in the container end enclosure 9, a medium outlet 11 is formed in the top of the container end enclosure, an electric heating element is arranged inside the container barrel 12, a protective sleeve 6 through which the electric heating element can pass is arranged in the container barrel 12, the electric heating element is a U-shaped electric heating tube 7, a straight section of the U-shaped electric heating tube 7 is sleeved with the protective sleeve 6, the sleeve 6 is supported through a fixing piece, and the fixing piece is composed of a fixed pull rod 14 and a fixing plate 13 perpendicular to the. The electric heating element comprises at least two U-shaped electric heating tubes 7, the open ends of the U-shaped electric heating tubes 7 face the tube plate flange 3, and a fixed pull rod 14 is arranged between the sleeves close to the top and the bottom of the container barrel 12. The U-shaped electric heating tube 7 penetrates through a tube plate flange 3 at the head of the container barrel 12 to be sleeved with the heat dissipation area sleeve 2, the conductive end of the electric heating element is electrically connected with the junction box 1, sealing plates are respectively arranged at the rear end, close to the tube plate flange 3, in the container barrel 12 and at the front end, close to the container end enclosure 9, of the tube plate flange 3, the rear end sealing plate is a front sealing plate 5, and the front end sealing plate of the container end enclosure 9 is a rear sealing plate 8. The protecting sleeve 6 is fixed between the front sealing plate 5 and the rear sealing plate 8, the two ends of the protecting sleeve 6 respectively penetrate through the front sealing plate 5 and the rear sealing plate 8, and the protecting sleeve 6 is in full-welding connection with the front sealing plate, the rear sealing plate and the container barrel 12. A gap is arranged between the protecting sleeve 6 and the U-shaped electric heating tube 7, and the gap is more than or equal to 2.5 mm. The heat exchange effect brought by heat flow is realized. The head of the vessel cylinder 12 is fixed with a vessel flange 4, and the vessel flange 4 is jointed with the tube plate flange 3. The bottom of the vessel cylinder 12 is provided with a sewage draining outlet 15. The bottom of the vessel cylinder 12 is attached to a vessel support 16 for supporting the cylinder.

When the device is installed, sealing plates, namely a front sealing plate 5 and a rear sealing plate 8, are respectively welded at the rear of the vessel tube plate flange 3 and the front of the vessel end socket 9. A small protecting pipe 6 is arranged in the middle, and the protecting pipe 6 can penetrate through the U-shaped electric heating pipe 7. The protective sleeve 6 is welded with the front seal plate 5 and the rear seal plate 8 at two ends (full welding needs to be performed for a pressure test), the front seal plate 5 and the inner wall of the container barrel are fully welded for 17 leakage prevention, and the rear seal plate 8 and the inner wall of the container barrel are fully welded for 18 leakage prevention. A U-shaped electric heating tube 7 penetrates through the protective sleeve 6 from one end of the container end socket 9 to one end of the container flange 4 and the tube plate flange 3. The protective sleeve, the sealing plates at two ends and the container barrel 12 are fully welded, and bear pressure without leakage. And welding the vessel flange 4, the vessel cylinder 12, the medium inlet 10 pipe and flange, the medium outlet 11 pipe and flange and the vessel end enclosure 9 to form the electric heating integral equipment. After the structure is adopted, the flow velocity of the molten salt entering the electric heater can be accelerated, and the heating density of the electric heating element can be amplified to 5W/cm²On the left and right sides, the diameter of the container is reduced or the length is shortened, the equipment body is obviously reduced, the field installation of a user is simple and convenient, the process temperature rise is fast, no heating blind area exists, and the operation effect is obviously improved; meanwhile, the manufacturing cost is low and good, and the service life of the electric heating element is greatly prolonged on the premise of ensuring the insulating property of the electric heating element, so that the invention is commented by the users of petroleum and medium petrochemicals.

In addition to the above, other embodiments of the present invention are possible. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention.

Claims

1. The utility model provides a fused salt electric heater, includes the container barrel of being connected with the electric heater terminal box, the afterbody of container barrel has the container head, be equipped with the medium import on the container head, the top is equipped with the medium export, electric heating element is settled to the inside of container barrel, electric heating element passes the tube sheet flange that is located the container barrel head and cup joints with the radiating area sleeve pipe, electric heating element's electrically conductive end with the terminal box electricity is connected, its characterized in that: a protective sleeve through which a heating element can penetrate is arranged in the container barrel, and sealing plates are respectively arranged at the rear end, close to the tube plate flange, in the container barrel and at the front end, close to the container end enclosure.

2. A molten salt electric heater as claimed in claim 1, characterised in that: the electric heating element is a U-shaped electric heating tube, and a straight section of the U-shaped electric heating tube is sleeved with a protective sleeve.

3. A molten salt electric heater as claimed in claim 2, characterised in that: the sleeve is supported by a fixing piece, and the fixing piece is composed of a fixing pull rod and a fixing plate perpendicular to the fixing pull rod.

4. A molten salt electric heater as claimed in claim 3, characterised in that: the electric heating tube comprises at least two U-shaped electric heating tubes, the opening ends of the U-shaped electric heating tubes face to a tube plate flange, and a fixed pull rod is arranged between sleeves close to the top and the bottom of a container barrel.

5. A molten salt electric heater as claimed in claim 1, characterised in that: the rear end sealing plate of the tube plate flange is a front sealing plate, and the front end sealing plate of the container end enclosure is a rear sealing plate.

6. A molten salt electric heater as claimed in claim 5, characterised in that: the protective sleeve is fixed between the front sealing plate and the rear sealing plate, two ends of the protective sleeve penetrate through the front sealing plate and the rear sealing plate respectively, and the protective sleeve is in full-welding connection with the front sealing plate, the rear sealing plate and the container barrel.

7. A molten salt electric heater as claimed in claim 6, characterised in that: a gap is formed between the protective sleeve and the U-shaped electric heating tube, and the gap is more than or equal to 2.5 mm.

8. A molten salt electric heater as claimed in claim 1, characterised in that: and the head of the container cylinder body is fixed with a container flange, and the container flange is attached to the tube plate flange.

9. A molten salt electric heater as claimed in claim 1, characterised in that: and a sewage draining outlet is formed in the bottom of the container barrel.

10. A molten salt electric heater as claimed in claim 9, characterised in that: the bottom of the container cylinder is connected with a container support used for supporting the cylinder.