CN213396612U

CN213396612U - Electric calcining furnace for recovering waste heat

Info

Publication number: CN213396612U
Application number: CN202022110509.5U
Authority: CN
Inventors: 王宇坤; 黄金; 张波
Original assignee: Ningxia Hongji New Material Technology Co ltd
Current assignee: Ningxia Hongji New Material Technology Co ltd
Priority date: 2020-09-23
Filing date: 2020-09-23
Publication date: 2021-06-08
Anticipated expiration: 2030-09-23

Abstract

The utility model provides a waste heat recovery utilizes electricity forge stove, including forging stove, heat transfer device, oil supplementing device, heat transfer device includes heat transfer case, heat exchange tube group, establish replacement heat tube group inside the heat transfer case, set up the connecting tube between chimney bottom and the heat transfer case, still set up supplementary evacuation pipe at the heat transfer case top, still set up first flashboard at the chimney bottom, set up the second flashboard on the connecting tube, set up the third flashboard on supplementary evacuation pipe, still set up entry separation wall, export separation wall in the heat transfer case inside, the inlet tube communicates with the connecting tube, the export pipeline is connected with supplementary evacuation pipe, the protection tube is hollow body, heat exchange tube group includes entry header pipe, export header pipe, a plurality of parallelly connected heat exchange oil pipe, heat exchange oil pipe passes the protection tube, the utility model discloses not only realize the mode of conduction oil heat transfer, but also can adjust and control the temperature of conduction oil heat transfer, the heat exchange tube set can be protected, damage to the heat exchange tube set is avoided, and the service life is prolonged.

Description

Electric calcining furnace for recovering waste heat

Technical Field

The utility model relates to a coal product calcines technical field, especially relates to an electricity forge furnace is utilized in waste heat recovery.

Background

The calcining furnace comprises a common calcining furnace and an electric calcining furnace, the calcining temperature is high, the heat of calcined tail gas is also high, sometimes the tail gas is in a flame state, the tail gas is discharged or enters a tail gas treatment system along a chimney at the top of the calcining furnace, the temperature of flame in the chimney is high, the flame can be fully utilized, in the prior art, heat exchange technologies for the part of heat are also provided, such as water heat exchange and oil heat exchange, water is supplied to domestic water in a plant area after the water heat exchange, and high-temperature heat conducting oil is used for providing heat for other processes after the oil heat exchange. The existing oil heat exchange mode is simple, the corrosion of a heat exchange tube group is serious, and the service life is short.

Disclosure of Invention

There is a need for an electric calciner with waste heat recovery.

A waste heat recovery electricity utilization calcining furnace comprises a calcining furnace body and a chimney arranged at the top of the furnace body, wherein the heat exchange device is arranged at the top of the furnace body, the oil supplementing device is arranged above the heat exchange device and communicated with the heat exchange device, the top of the chimney is a flue gas exhaust port, the heat exchange device comprises a heat exchange box and a heat exchange tube set, the heat exchange box is a hollow sealed cavity, the heat exchange box is internally provided with a replacement heat tube set, the heat exchange tube set is internally used for introducing heat conduction oil, a connecting pipeline is arranged between the bottom of the chimney and the heat exchange box, the top of the auxiliary exhaust tube is open, the bottom of the auxiliary exhaust tube is communicated with the inside of the heat exchange box, the bottom of the chimney is provided with a first flashboard, the height of the first flashboard is higher than that of the connecting pipeline, and a second flashboard is arranged on the connecting pipeline, the third flashboard is arranged on the auxiliary emptying pipe, the inlet separating wall and the outlet separating wall are arranged in the heat exchange box, the inlet separating wall and the outlet separating wall are respectively close to a flame or flue gas inlet pipeline and an outlet pipeline of the heat exchange box, the inlet pipeline is communicated with the connecting pipeline, the outlet pipeline is connected with the auxiliary emptying pipe so as to divide the heat exchange box into an inlet transition section, an outlet transition section and a heat exchange section, a plurality of mounting holes are formed in the inlet separating wall and the outlet separating wall and used for mounting protective pipes, the protective pipes are hollow pipes, two ends of each protective pipe are connected with the inlet separating wall and the outlet separating wall, each heat exchange pipe group comprises an inlet collecting pipe, an outlet collecting pipe and a plurality of heat exchange oil pipes which are connected in parallel, each heat exchange oil pipe penetrates through the protective pipe, two ends of each heat exchange pipe are respectively connected with the inlet collecting pipe and the outlet collecting pipe, and the inlet collecting pipe and, the inlet manifold is connected with the oil supplementing device, and the outlet manifold is used for discharging heat conduction oil after heat exchange.

Preferably, the auxiliary emptying pipe and the connecting pipeline are positioned at two opposite ends of the box body.

Preferably, the side wall of the heat exchange box is sequentially provided with a steel plate layer, an isolation layer and a heat insulation layer from outside to inside.

Preferably, the protection tube is a metal high temperature resistant layer.

Preferably, the oil supplementing device is an oil supplementing tank which is a hollow box body and is used for containing heat conduction oil, and a liquid level meter is arranged on the outer wall of the oil supplementing tank and used for observing the oil level inside the oil supplementing tank.

Preferably, an oil supplementing pipe is further arranged between the oil supplementing tank and the heat exchange tank, and a control valve is further arranged on the oil supplementing pipe.

Preferably, the inlet and the outlet of the heat exchange tube set are positioned outside the box body, the inlet of the heat exchange tube set is connected with the oil supplementing tube, and the outlet of the heat exchange tube set is provided with the temperature detector.

The utility model discloses in, not only realized the mode of conduction oil heat transfer, can carry out regulation control to the temperature of conduction oil heat transfer moreover, can also protect heat exchange tube group, avoid its damage increase of service life.

Drawings

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

Fig. 2 is a front view of fig. 1.

FIG. 3 is a schematic view of a heat exchange apparatus.

In the figure: the device comprises a calcining furnace 10, a furnace body 11, a chimney 12, a first gate 13, a connecting pipeline 14, a second gate 15, a heat exchange device 20, a heat exchange box 21, a steel plate layer 211, an isolation layer 212, a heat insulation layer 213, an inlet isolation wall 214, an outlet isolation wall 215, an inlet pipeline 216, an outlet pipeline 217, a heat exchange tube group 22, an inlet collecting pipe 221, an outlet collecting pipe 222, a heat exchange oil pipe 223, a protection pipe 224, an auxiliary emptying pipe 23, a third gate 24, an oil supplementing device 30 and an oil supplementing pipe 31.

Detailed Description

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.

Referring to fig. 1-3, an embodiment of the present invention provides an electric calcining furnace for waste heat recovery, including a calcining furnace 10, a heat exchanging device 20, and an oil supplementing device 30, where the calcining furnace 10 includes a furnace body 11 and a chimney 12 disposed on the top of the furnace body 11, the heat exchanging device 20 is disposed on the top of the furnace body 11, the oil supplementing device 30 is disposed above the heat exchanging device 20 and communicated with the heat exchanging device 20, the top of the chimney 12 is a flue gas exhaust port, the heat exchanging device 20 includes a heat exchanging box 21 and a heat exchanging tube set 22, the heat exchanging box 21 is a hollow sealed cavity, the heat exchanging tube set 22 is disposed inside the heat exchanging box 21, the heat exchanging tube set 22 is used for introducing heat conducting oil, a connecting pipeline 14 is disposed between the bottom of the chimney 12 and the heat exchanging box 21, an auxiliary exhaust tube 23 is disposed on the top of the heat exchanging box 21, the top of the auxiliary exhaust tube 23 is, a first gate plate 13 is further arranged at the bottom of the chimney 12, the first gate plate 13 is higher than the connecting pipeline 14, a second gate plate 15 is arranged on the connecting pipeline 14, a third gate plate 24 is arranged on the auxiliary emptying pipe 23, an inlet partition wall 214 and an outlet partition wall 215 are further arranged inside the heat exchange box 21, the inlet partition wall 214 and the outlet partition wall 215 are respectively arranged close to a flame or flue gas inlet pipeline 216 and an outlet pipeline 217 of the heat exchange box 21, the inlet pipeline 216 is communicated with the connecting pipeline 14, the outlet pipeline 217 is connected with the auxiliary emptying pipe 23 to divide the heat exchange box 21 into an inlet transition section, an outlet transition section and a heat exchange section, a plurality of mounting holes are further formed in the inlet partition wall 214 and the outlet partition wall 215 for mounting a protection pipe 224, the protection pipe 224 is a hollow pipe body, and two ends of the protection pipe 224 are connected with the inlet partition wall 214 and the outlet partition wall 215, the heat exchange tube set 22 comprises an inlet collection tube 221, an outlet collection tube 222 and a plurality of heat exchange oil tubes 223 connected in parallel, the heat exchange oil tubes 223 penetrate through a protection tube 224, two ends of the heat exchange oil tubes are respectively connected with the inlet collection tube 221 and the outlet collection tube 222, the inlet collection tube 221 and the outlet collection tube 222 are respectively a header tube, the inlet collection tube 221 is connected with the oil supplementing device 30, and the outlet collection tube 222 is used for discharging heat conduction oil after heat exchange.

According to the scheme, the heat exchange of the heat conduction oil is realized through the heat exchange device 20, so that the tail gas heat of the calcining furnace 10 is fully utilized. The heat quantity obtained by exchanging is more because the specific heat capacity of the heat conduction oil is larger, but the heat conduction oil is deteriorated due to high temperature because the flash point of the heat conduction oil is about 240 ℃. Therefore, the scheme can also realize the temperature controllability of heat transfer oil.

When heat exchange is not needed, the first flashboard 13 is opened, the second flashboard 15 is closed, and flame or smoke is discharged along the chimney 12; when heat exchange is needed, the first gate plate 13 is closed, the second gate plate 15 is opened, the third gate plate 24 is opened, and flame or smoke enters the heat exchange box 21 to exchange heat with heat conduction oil; when the heat transfer temperature of the heat transfer oil is too high, part of the first flashboards 13 are opened, and part of the second flashboards 15 are closed, so that the heat entering the heat transfer box 21 is reduced, the temperature of the heat transfer oil is controllable, and the phenomenon that the heat transfer oil is overheated and goes bad is avoided.

The present solution also allows to achieve a protective effect on the heat exchange tube set 22.

Further, the auxiliary emptying pipe 23 and the connecting pipe 14 are located at opposite ends of the box body so as to be farthest away from each other, thereby maximizing the flowing time and the flowing distance of the flame inside the box body.

Further, the side wall of the heat exchange box 21 is sequentially provided with a steel plate layer 211, an isolation layer 212 and a heat insulation layer 213 from outside to inside. The steel plate layer 211 is formed by welding steel plates, the isolation layer 212 is made of a material with an extremely low heat conductivity coefficient, such as an asbestos layer, and the heat insulation layer 213 is formed by building heat insulation bricks.

Further, the protection pipe 224 is a metal high temperature resistant layer. The setting of this protective layer, with heat exchange tube group 22 parcel isolation, avoid high temperature flue gas or flame to heat exchange tube group 22's direct contact damage, for example high temperature burns out or the corrosive damage to it of the chemical in the flame flue gas, more importantly, this protective layer parcel back, earlier than flame, the flue gas contact, bear flame, the heat of flue gas, make save more heat on this protective layer, this protective layer becomes an even heat accumulator, as the heat source to heat exchange tube group 22 radiant heat, make the heat that heat exchange tube group 22 bore evenly stable, can not make heat exchange tube group 22 local temperature too high or low, cause local burning to lose. The two ends of the protection tube 224 are exposed outside the inlet partition wall 214 and the outlet partition wall 215, so that the heat conduction oil tube is also exposed outside the heat exchange section and is not directly contacted with the flame or the flue gas of the heat exchange portion.

Further, the oil supplementing device 30 is an oil supplementing tank, the oil supplementing tank is a hollow box body, the oil supplementing tank is used for containing heat conduction oil, and a liquid level meter is further arranged on the outer wall of the oil supplementing tank and used for observing the oil level inside the oil supplementing tank.

Further, an oil supply pipe 31 is arranged between the oil supply tank and the heat exchange tank 21, and a control valve is arranged on the oil supply pipe 31. Used for controlling the opening and closing of the heat conducting oil entering the heat exchange box 21 in the oil supplementing box.

Further, the inlet and the outlet of the heat exchange tube set 22 are located outside the box body, the inlet of the heat exchange tube set 22 is connected with the oil supplementing tube 31, and the outlet of the heat exchange tube set 22 is provided with a temperature detector. And the device is used for detecting the temperature of the heat conduction oil after heat exchange.

The embodiment of the utility model provides a module or unit in the device can merge, divide and delete according to actual need.

The above disclosure is only illustrative of the preferred embodiments of the present invention, which should not be taken as limiting the scope of the invention, but rather the invention can be embodied in other specific forms without departing from the spirit or essential characteristics thereof. It will be understood by those skilled in the art that all or part of the above-described embodiments may be implemented and equivalents thereof may be made to the claims of the present invention while remaining within the scope of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. An electricity forge furnace for recovering waste heat is characterized in that: the device comprises a calcining furnace, a heat exchange device and an oil supplementing device, wherein the calcining furnace comprises a furnace body and a chimney arranged at the top of the furnace body, the heat exchange device is arranged at the top of the furnace body, the oil supplementing device is arranged above the heat exchange device and is communicated with the heat exchange device, the top of the chimney is a flue gas emptying port, the heat exchange device comprises a heat exchange box and a heat exchange tube group, the heat exchange box is a hollow sealed cavity, a replacement heat tube group is arranged in the heat exchange box, heat transfer oil is introduced into the heat exchange tube group, a connecting pipeline is arranged between the bottom of the chimney and the heat exchange box, an auxiliary emptying pipe is arranged at the top of the heat exchange box, the top of the auxiliary emptying pipe is open, the bottom of the auxiliary emptying pipe is communicated with the interior of the heat exchange box, a first flashboard is arranged at the bottom of the chimney, the height of the first flashboard is higher, still set up entry in the heat transfer case and separate the wall, export the wall, entry division wall and export division wall are close to the flame or flue gas entry pipeline and the export pipeline setting of heat transfer case respectively, entry pipeline communicates with the connecting tube, export pipeline is connected with supplementary evacuation pipe to cut apart the heat transfer case into entry changeover portion, export changeover portion, heat transfer section, still set up a plurality of mounting holes on entry division wall and export division wall for the installation protection tube, the protection tube is hollow body, the both ends of protection tube are connected with entry division wall, export division wall, heat exchange tube group includes entry manifold, export manifold, a plurality of heat transfer oil pipe that connect in parallel, heat transfer oil pipe passes the protection tube, both ends are connected with entry manifold, export manifold respectively, entry manifold, export manifold are a house steward respectively, entry manifold is connected with the oil filling device, the outlet header pipe is used for discharging heat-conducting oil after heat exchange.

2. The electric calciner for recovering waste heat according to claim 1, wherein: the auxiliary emptying pipe and the connecting pipeline are positioned at two opposite ends of the box body.

3. The electric calciner for recovering waste heat according to claim 1, wherein: the side wall of the heat exchange box is sequentially provided with a steel plate layer, an isolation layer and a heat insulation layer from outside to inside.

4. The electric calciner for recovering waste heat according to claim 1, wherein: the protection tube is a metal high temperature resistant layer.

5. The electric calciner for recovering waste heat according to claim 1, wherein: the oil supplementing device is an oil supplementing tank which is a hollow box body and is used for containing heat conduction oil, and a liquid level meter is arranged on the outer wall of the oil supplementing tank and used for observing the oil level inside the oil supplementing tank.

6. The electric calciner for recovering waste heat according to claim 4, wherein: an oil supplementing pipe is arranged between the oil supplementing tank and the heat exchange tank, and a control valve is arranged on the oil supplementing pipe.

7. The electric calciner for recovering waste heat according to claim 1, wherein: the inlet and the outlet of the heat exchange tube set are positioned outside the box body, the inlet of the heat exchange tube set is connected with the oil supplementing tube, and the outlet of the heat exchange tube set is provided with a temperature detector.