阅读说明：本技术 一种便于更换的熔盐电加热装置及更换方法 (Molten salt electric heating device convenient to replace and replacing method ) 是由 顾清之 张艳梅 顾晓鸥 赵伟杰 张素娟 仇秋玲 于 2020-12-31 设计创作，主要内容包括：本发明公开了一种便于更换的熔盐电加热装置及更换方法,属于熔盐储热设备领域,包括：多个电加热管,多个电加热管伸入熔盐储罐中；连接装置,连接多个电加热管至熔盐储罐；中空管体,中空管体设置于多个电加热管之间,并连接上述连接装置,中空管体靠近储热介质的一端呈封闭结构；电加热棒,电加热棒可拆卸的放置于中空管体中。本发明技术方案的有益效果在于：在加热管本体上增设一个中空管体,并且中空管体的长度要大于加热管本体的长度,当加热管本体损坏,且储热介质凝固时,将电加热棒放入中空管体中,对加热管本体周围的储热介质进行加热,能够融化凝固的储热介质,并将加热管本体取出更换。(The invention discloses a molten salt electric heating device convenient to replace and a replacing method, belonging to the field of molten salt heat storage equipment and comprising the following steps: the plurality of electric heating pipes extend into the molten salt storage tank; the connecting device is used for connecting the plurality of electric heating pipes to the molten salt storage tank; the hollow pipe body is arranged among the plurality of electric heating pipes and is connected with the connecting device, and one end of the hollow pipe body, which is close to the heat storage medium, is of a closed structure; the electric heating rod is detachably placed in the hollow pipe body. The technical scheme of the invention has the beneficial effects that: add a cavity body on the heating pipe body to the length of cavity body will be greater than the length of heating pipe body, when the heating pipe body damages, and heat-retaining medium solidifies, puts into the cavity body with the electric heating stick, heats the heat-retaining medium around the heating pipe body, can melt the heat-retaining medium who solidifies, and takes out the heating pipe body and change.)

1. A molten salt electric heating apparatus convenient to replace, comprising:

the system comprises a plurality of electric heating pipes, a plurality of heat exchange pipes and a plurality of heat exchange pipes, wherein the plurality of electric heating pipes extend into a molten salt storage tank, and the molten salt storage tank is used for storing a heat storage medium;

a connecting device for connecting a plurality of electric heating pipes to the molten salt storage tank;

the hollow pipe body is arranged among the plurality of electric heating pipes and is connected with the connecting device, and one end, close to the heat storage medium, of the hollow pipe body is of a closed structure;

the electric heating rod is detachably placed in the hollow pipe body.

2. A molten salt electric heating apparatus as claimed in claim 1, characterised in that the connection means comprises:

the junction box is connected with the plurality of electric heating pipes, and leads of the plurality of electric heating pipes are arranged in the junction box and are connected with a power supply;

and a round hole which is communicated up and down is also formed in the junction box, and one end of the hollow pipe body, which is far away from the heat storage medium, penetrates through the round hole.

3. A molten salt electric heating apparatus as claimed in claim 1, in which the hollow tubular body is provided at a central location of a plurality of the electric heating pipes.

4. The molten salt electric heating apparatus of claim 1, further comprising a connecting flange through which a plurality of the electric heating pipes are fixedly mounted on the molten salt storage tank.

5. A molten salt electric heating apparatus as claimed in claim 1, in which the hollow pipe body has a length greater than that of the electric heating pipes, and one end of the hollow pipe body near the heat storage medium protrudes from each of the electric heating pipes.

6. The molten salt electric heating apparatus as claimed in claim 1, wherein a length of a portion of the hollow pipe body protruding out of the electric heating pipe is 0.5-2 times an inner diameter of the electric heating pipe.

7. A molten salt electric heating apparatus as claimed in claim 1, in which the diameter of the electric heating rod is less than the internal diameter of the hollow pipe body.

8. A molten salt electric heating apparatus as claimed in claim 4, in which each electric heating tube is an unheated zone down a predetermined range from the connecting flange.

9. A molten salt electric heating apparatus as claimed in claim 1, characterised in that the electric heating rod is a single-ended electric heating rod.

10. A method of replacing a molten salt electric heating apparatus, comprising the molten salt electric heating apparatus of any one of claims 1 to 9; the method comprises the following steps:

step S1, inserting the electric heating rod into the hollow tube body;

step S2, switching on a power supply of the electric heating rod, and heating the heat storage medium by the electric heating rod;

step S3, opening the connecting flange and taking out the whole electric heating device after the heat storage medium solidified around each electric heating pipe melts;

and step S4, replacing a new electric heating device, and fixedly installing the new electric heating device and the molten salt storage tank through the connecting flange.

Technical Field

The invention relates to the field of molten salt heat storage equipment, in particular to a molten salt electric heating device convenient to replace and a replacing method.

Background

Because the country advocates energy conservation and environmental protection vigorously, and the use of small-sized coal-fired boilers is forbidden, most areas begin to start coal-to-electricity engineering, and electricity replaces coal to supply heat. The molten salt heat storage technology is also gradually developed, in the molten salt heat storage technology, a heat storage medium (such as molten salt) in a molten salt storage tank is heated in a valley electricity period or by using cheap electricity, heat is stored in the heat storage medium, and when needed, a heat exchange medium is introduced into the molten salt storage tank to exchange heat with the heat storage medium, so that required heat is obtained and supplied to a user. Because the heating efficiency of the electric heating device is the best when the electric heating device is in direct contact with the heat storage medium, and simultaneously, the volume of the heat storage medium is increased when the heat storage medium is melted into liquid, the electric heating device is inserted into the heat storage medium from the top of the molten salt storage tank, so that when the molten salt is completely solidified, the electric heating device can be restarted without damaging the molten salt storage tank.

At present, an electric heating device in molten salt heat storage equipment is an easily damaged device, and when the heat storage equipment is shut down due to the damage of the electric heating device, a certain time is needed for manufacturing a new electric heating device, at the moment, molten salt in a molten salt storage tank can be solidified, so that the electric heating device is limited in the solidified molten salt and cannot be pulled out, the replacement and maintenance of the electric heating device cannot be realized, and therefore, aiming at the problems, the molten salt electric heating device and the replacement method which can be conveniently replaced are urgently needed to be designed to meet the needs of practical use.

Disclosure of Invention

Aiming at the problems in the prior art, the molten salt electric heating device convenient to replace and the replacing method are provided, and the specific technical scheme is as follows:

a molten salt electric heating apparatus convenient to replace, comprising:

the system comprises a plurality of electric heating pipes, a plurality of heat exchange pipes and a plurality of heat exchange pipes, wherein the plurality of electric heating pipes extend into a molten salt storage tank, and the molten salt storage tank is used for storing a heat storage medium;

a connecting device for connecting a plurality of electric heating pipes to the molten salt storage tank;

the hollow pipe body is arranged among the plurality of electric heating pipes and is connected with the connecting device, and one end, close to the heat storage medium, of the hollow pipe body is of a closed structure;

the electric heating rod is detachably placed in the hollow pipe body.

Preferably, the connecting means comprises:

the junction box is connected with the plurality of electric heating pipes, and leads of the plurality of electric heating pipes are arranged in the junction box and are connected with a power supply;

and a round hole which is communicated up and down is also formed in the junction box, and one end of the hollow pipe body, which is far away from the heat storage medium, penetrates through the round hole.

Preferably, the hollow pipe body is disposed at a central position of the plurality of electric heating pipes.

Preferably, the connecting device further comprises a connecting flange, and the plurality of electric heating pipes are fixedly mounted on the molten salt storage tank through the connecting flange.

Preferably, the length of the hollow pipe body is greater than that of the electric heating pipes, and one end of the hollow pipe body, which is close to the heat storage medium, protrudes out of each electric heating pipe.

Preferably, the length of the part of the hollow pipe body protruding out of the electric heating pipe is 0.5-2 times of the inner diameter of the electric heating pipe.

Preferably, the diameter of the electric heating rod is smaller than the inner diameter of the hollow pipe body.

Preferably, each of the electric heating pipes is an unheated area which extends downward from the connecting flange to a predetermined range.

Preferably, the electric heating rod is a single-head electric heating rod.

The invention also provides a replacing method of the molten salt electric heating device, which comprises the molten salt electric heating device convenient to replace; the method comprises the following steps:

step S1, inserting the electric heating rod into the hollow tube body;

step S2, switching on a power supply of the electric heating rod, and heating the heat storage medium by the electric heating rod;

step S3, opening the connecting flange and taking out the whole electric heating device after the heat storage medium solidified around each electric heating pipe melts;

and step S4, replacing a new electric heating device, and fixedly installing the new electric heating device and the molten salt storage tank through the connecting flange.

The technical scheme of the invention has the beneficial effects that:

according to the invention, the original heating pipe body is improved, the hollow pipe body is additionally arranged on the heating pipe body, when the heat storage tank body is stopped due to the damage of the heating pipe body and the heat storage medium is solidified, the electric heating rod is placed into the hollow pipe body through the electric heating device to heat the heat storage medium around the heating pipe body, so that the solidified heat storage medium can be melted, and the heating pipe body is taken out and replaced.

Drawings

FIG. 1 is a schematic view of an electrical heating apparatus of the present invention, which is easy to replace;

FIG. 2 is a schematic structural view of an embodiment of an electrical heating rod according to the present invention;

fig. 3 is a top view of an embodiment of the junction box of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.

The invention is further described with reference to the following drawings and specific examples, which are not intended to be limiting.

The invention provides an electric heating device convenient to replace, which belongs to the field of molten salt heat storage equipment, and as shown in figures 1 and 2, the electric heating device comprises:

a molten salt electric heating apparatus convenient to replace, comprising:

a plurality of electric heating pipes 2, the plurality of electric heating pipes 2 extending into a molten salt storage tank (not shown in the figure) for storing a heat storage medium;

the connecting device is used for connecting the plurality of electric heating pipes 2 to the molten salt storage tank;

the hollow pipe body 4 is arranged among the plurality of electric heating pipes 2 and is connected with the connecting device, and one end, close to the heat storage medium, of the hollow pipe body 4 is of a closed structure;

the electric heating rod 5, the electric heating rod 5 is detachably placed in the hollow pipe body 4.

Specifically, in the present embodiment, the molten salt electric heating device includes an electric heating pipe 2, a hollow pipe body 4, and an electric heating rod 5; wherein, the electric heating pipe 2 adopts any one electric heating pipe which can be used by the molten salt heat storage equipment in the prior art; on the basis of the existing electric heating tube 2, the hollow tube 4 is additionally arranged at the center of the electric heating tube, the shape of the hollow tube 4 can be designed according to the actual design, for example, the cross section of the hollow tube 4 is set to be in a geometric structure such as a square, a diamond, a triangle and the like, preferably, in the embodiment, the hollow tube 4 is cylindrical, and the lower end of the hollow tube 4 is closed, so that the heat storage medium is prevented from entering the hollow tube 4 in the daily molten salt heat storage process, and if the lower end of the hollow tube 4 is not in a closed structure, when the heat storage medium is solidified, the solidified heat storage medium also exists in the hollow tube 4; by adopting the molten salt electric heating device in the technical scheme, when the electric heating pipe 2 in the molten salt heat storage equipment is damaged, the electric heating rod 5 is inserted into the hollow pipe body 4 and is electrified for heating, and the hollow pipe body 4 is arranged at the central position of the electric heating pipe 2, so that the electric heating rod 5 can melt the heat storage medium solidified around the electric heating pipe 2 by taking the electric heating rod as a center, all the heat storage medium in the molten salt storage tank is not required to be completely melted, and the energy is saved;

the electric heating device provided by the invention has the advantages that: a plurality of electric heating pipe 2 and hollow tube body are integrated in an organic whole, and it adopts detachable design with electric heating rod 5, and electric heating rod 5 can daily storage in hollow tube body 4, also can when needs use, puts into hollow tube body 4 again to electric heating pipe 2 in a plurality of fused salt heat-retaining device is applicable to an electric heating pipe 5.

In a preferred embodiment, the connection means comprises:

the terminal box 1 is connected with the plurality of electric heating pipes 2, and leads of the plurality of electric heating pipes 2 are all arranged in the terminal box 1 and are connected with a power supply;

the junction box 1 is also provided with a round hole 11 which is through up and down, and one end of the hollow pipe body 4 far away from the heat storage medium penetrates through the round hole 11.

Specifically, the junction box 1 comprises a box body and an upper box cover, and a round hole 11 in the junction box 1 is vertically communicated; the electric heating pipe 2 is fixed at the bottom of the box body of the junction box 1, the hollow pipe body 4 penetrates through the round hole 11 at the bottom of the box body and is communicated with the upper surface of the upper box cover, and a lead of the electric heating pipe 2 is arranged in the junction box 1 and is connected with a power supply of the molten salt heat storage equipment of the device to provide electricity for the electric heating pipe 2.

In a preferred embodiment, the connecting device further comprises a connecting flange 3, and the plurality of electric heating pipes 2 are fixedly mounted on the molten salt storage tank through the connecting flange 3.

In a preferred embodiment, the length of the hollow tube 4 is greater than the length of the electric heating tubes 2, and one end of the hollow tube 4 near the heat storage medium protrudes from each electric heating tube 2.

Specifically, in this embodiment, the length of hollow pipe 4 is greater than the length of electric heating pipe 2, and the lower extreme of hollow pipe 4 (be close to the one end of heat-retaining medium promptly) will be longer than electric heating pipe 2, and this is because along with the temperature rise, the density of heat-retaining medium (fused salt) can diminish, so the heat-retaining medium after the heating can flow up, if the lower extreme of hollow pipe 4 is unanimous with the lower extreme parallel and level of electric heating pipe 2, is difficult to guarantee that the heat-retaining medium around electric heating pipe 2 bottom can melt.

In a preferred embodiment, the length of the portion of the hollow tube body 4 protruding out of the electric-heating tube 2 is 0.5-2 times the inner diameter of the electric-heating tube 2.

In a preferred embodiment, the diameter of the electric heating rod 5 is smaller than the inner diameter of the hollow tube 4 so that the electric heating rod 5 can be easily inserted into the hollow tube 4, and preferably, the diameter of the electric heating rod 5 is 1-2mm smaller than the inner diameter of the hollow tube 4, and the length of the electric heating rod 5 is at least longer than the heating zone of the electric heating tube 2, and can be the same as the length of the hollow tube 4, and just can be inserted into the bottom of the hollow tube 4.

In a preferred embodiment, each electric heating tube 2 is an unheated region from the connecting flange 3 downward to a predetermined range.

Specifically, the electric heating pipe 2 is inserted from the top of the molten salt storage tank, the electric heating pipe 2 is fixedly installed on the molten salt storage tank through the connecting flange 3, the lower end of the electric heating pipe 2 is immersed in the heat storage medium, and a region which is not immersed in the heat storage medium from below the connecting flange 3 to the electric heating pipe 2 is a non-heating region, so that the electric heating pipe 2 is prevented from being damaged due to dry burning in the air.

In a preferred embodiment, the electrical heating rod 5 is a single-headed electrical heating rod.

The invention also provides a replacing method of the molten salt electric heating device, which comprises the molten salt electric heating device convenient to replace; the replacing steps of the molten salt electric heating device are as follows:

step S1, inserting the electric heating rod 5 into the hollow tube 4;

step S2, switching on a power supply of the electric heating rod 5, and heating the heat storage medium by the electric heating rod 5;

step S3, opening the connecting flange 3 after the heat storage medium solidified around each electric heating tube 2 melts, and taking out the whole electric heating device;

and step S4, replacing the new electric heating device, and fixedly installing the new electric heating device and the molten salt storage tank through the connecting flange 3.

Specifically, after the electric heating pipe 2 is damaged, the electric heating pipe is to be replaced, and a certain time is needed for manufacturing a new electric heating device, at the moment, the temperature of the heat storage medium is reduced, the heat storage medium is condensed into a solid, and the electric heating pipe 2 is frozen in the heat storage medium.

The technical scheme of the invention has the beneficial effects that:

according to the invention, the original heating pipe body is improved, the hollow pipe body is additionally arranged on the heating pipe body, the length of the hollow pipe body is larger than that of the heating pipe body, when the heating pipe body is damaged to cause the stop of the heat storage tank body and the heat storage medium is solidified, the electric heating rod is placed into the hollow pipe body through the electric heating device to heat the heat storage medium around the heating pipe body, the solidified heat storage medium can be melted, and the heating pipe body is taken out and replaced.

While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention.