Device and method for utilizing waste heat of roasting furnace for carbon anode

Abstract

The invention discloses a carbon anode roasting furnace waste heat utilization device and method.The carbon anode roasting furnace waste heat utilization device comprises a roasting furnace used for roasting a carbon anode; the waste heat recovery mechanism is arranged on a flue gas pipeline connected with the roasting furnace and is used for absorbing flue gas heat discharged from the roasting furnace; the hot water storage tank is connected with the waste heat recovery mechanism through a connecting pipe and used for storing heat transferred through a circulating medium in the waste heat recovery mechanism; the air inlet pipe is arranged at one end of the hot water storage tank, the other end of the hot water storage tank is connected with an air outlet pipe, the air outlet pipe is connected with a roasting furnace, and a fan is arranged on the air outlet pipe and used for introducing air entering the hot water storage tank into the roasting furnace to heat the carbon anode after heat exchange; according to the waste heat utilization device and method of the roasting furnace for the carbon anode, heat in flue gas discharged by the roasting furnace is recovered through the waste heat recovery mechanism, and the heat is converted into high-temperature inlet gas to supply heat to the roasting furnace, so that the energy utilization rate is increased, and the fuel consumption is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of carbon anode production, in particular to a baking furnace waste heat utilization device and method for carbon anode. BACKGROUND

[0002] As an important component of aluminum electrolysis cell, carbon anode usually needs a large amount of heat energy in the baking process.

[0003] At present, the baking furnace mainly relies on burning coal gas, natural gas or other fossil fuels to provide heat, resulting in large energy consumption and high production cost. With the improvement of energy saving and environmental protection requirements, how to effectively recover and utilize the waste heat generated by the baking furnace has become a problem to be solved in the production process of carbon anode. SUMMARY

[0004] The technical problem to be solved by the present application is to overcome the defects of the prior art, provide a baking furnace waste heat utilization device and method for carbon anode, and recycle the heat in the flue gas discharged from the baking furnace through a waste heat recovery mechanism, and convert the heat into high-temperature intake air for heating the baking furnace, thereby improving energy utilization and reducing fuel consumption, which can effectively solve the problems in the background art.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical scheme: a baking furnace waste heat utilization device for carbon anode, comprising:

[0006] a baking furnace for baking carbon anode;

[0007] a waste heat recovery mechanism arranged on a flue gas pipeline connected with the baking furnace, for absorbing the heat of flue gas discharged from the baking furnace;

[0008] a hot water storage tank connected with the waste heat recovery mechanism through a connecting pipe, for storing the heat transferred by the circulating medium in the waste heat recovery mechanism;

[0009] an air inlet pipe arranged at one end of the hot water storage tank, the other end of the hot water storage tank being connected with an air outlet pipe, the air outlet pipe being connected with the baking furnace, and a fan being arranged on the air outlet pipe for introducing the air heated in the hot water storage tank into the baking furnace to heat the carbon anode;

[0010] a circulating pump having one end connected with the hot water storage tank through a first connecting water pipe and the other end connected with the waste heat recovery mechanism through a second connecting water pipe, for realizing repeated use of the circulating medium.

[0011] As a preferred technical scheme of the present application, the waste heat recovery mechanism comprises a recovery box body and a first disc-shaped pipe, the first disc-shaped pipe is arranged in the recovery box body, one end of the first disc-shaped pipe is connected with the second connecting water pipe, and the other end of the first disc-shaped pipe is connected with the connecting pipe.

[0012] As a preferred technical scheme of the present application, the first disc-shaped tube is arranged along the direction of flue gas flow.

[0013] As a preferred technical scheme of the present application, the outer side of the first disc-shaped tube is uniformly provided with heat-conducting fins.

[0014] As a preferred technical scheme of the present application, the hot water storage tank comprises a water storage box body and a second disc-shaped tube, the second disc-shaped tube is located in the water storage box body, the water storage box body is located below the waste heat recovery mechanism, one end of the second disc-shaped tube is connected with the air inlet pipe, and the other end of the second disc-shaped tube is connected with the air outlet pipe.

[0015] As a preferred technical scheme of the present application, the second disc-shaped tube is arranged along the height direction of the water storage box body.

[0016] As a preferred technical scheme of the present application, the upper end of the inside of the water storage box body is provided with a water collecting box, the upper end of the water collecting box is connected with a connecting pipe, and the lower end of the water collecting box is uniformly provided with a spray head.

[0017] As a preferred technical scheme of the present application, the flue gas treatment system comprises a filtering assembly and a desulfurization assembly, and the filtering assembly and the desulfurization assembly are arranged on the flue gas pipeline located at the upper end of the waste heat recovery mechanism.

[0018] A waste heat utilization method for a carbon anode baking furnace, when flue gas discharged from the baking furnace passes through a waste heat recovery mechanism, the waste heat recovery mechanism absorbs heat in the flue gas, then transfers the heat to a hot water storage tank through a circulating medium, the hot water storage tank exchanges heat with air entering the baking furnace, and high-temperature gas is introduced into the baking furnace to heat the carbon anode.

[0019] Compared with the prior art, the present application has the beneficial effects that: the waste heat utilization device and method for the carbon anode baking furnace recover the heat of flue gas discharged from the baking furnace, convert it into usable heat energy for preheating air entering the baking furnace, greatly improve the energy utilization efficiency of the overall system, and reduce the dependence on external energy; by recovering waste heat and using it for heating air in the furnace, fuel consumption is reduced, especially in the high-temperature process of carbon anode production, a large amount of energy is saved. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the present application;

[0021] Figure 2 It is a front view of the present application;

[0022] Figure 3 It is a left view of Figure 2 the present application;

[0023] Figure 4 is a structural schematic view of the waste heat recovery mechanism;

[0024] Figure 5 is a structural schematic view of the hot water storage tank.

[0025] In the figure: 1 calcination furnace, 2 flue gas pipeline, 3 waste heat recovery mechanism, 31 recovery box body, 32 first disc-shaped pipe, 33 heat conduction fin, 4 connecting pipe, 5 hot water storage tank, 51 water storage box body, 52 second disc-shaped pipe, 53 water collecting tank, 54 spray head, 6 air inlet pipe, 7 air outlet pipe, 8 fan, 9 flue gas treatment system, 91 filter assembly, 92 desulfurization assembly, 10 circulating pump, 11 first connecting water pipe, 12 second connecting water pipe. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments (for the convenience of description and understanding, the following description is made with the upper side as the upper side). Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of the present application. Figure 2

[0027] Please refer to Figures 1-5 , the present application provides a technical solution: a waste heat utilization device for carbon anode calcination furnace, comprising a waste heat recovery mechanism 3, a hot water storage tank 5 and a circulating pump 6.

[0028] Specifically, the waste heat recovery mechanism 3 comprises a recovery box body 31 and a first disc-shaped pipe 32, the first disc-shaped pipe 32 is arranged in the recovery box body 31, one end of the first disc-shaped pipe 32 is connected with the second connecting water pipe 12, the other end of the first disc-shaped pipe 32 is connected with the connecting pipe 4, the high-temperature flue gas discharged by the calcination furnace 1 enters into the recovery box body 31 through the flue gas pipeline 2, when the high-temperature flue gas passes through the first disc-shaped pipe 32, it exchanges heat with the circulating medium flowing in the first disc-shaped pipe 32, absorbs the heat of the high-temperature flue gas, and the circulating medium is preferably water;

[0029] ​Specifically, the hot water storage tank 5 comprises a water storage tank 51 and a second disc-shaped tube 52, the second disc-shaped tube 52 is located in the water storage tank 51, the water storage tank 51 is located below the recovery tank 31, the other end of the connecting pipe 4 is connected with the second disc-shaped tube 52, the recycled medium after heat exchange is introduced into the second disc-shaped tube 52 by gravity, the air inlet pipe 6 is connected with one end of the second disc-shaped tube 52, the other end of the second disc-shaped tube 52 is connected with the air outlet pipe 7, the air entering the second disc-shaped tube 52 through the air inlet pipe 6 is heated by heat exchange with the high-temperature recycled medium after heat exchange, the other end of the second disc-shaped tube 52 is connected with the air outlet pipe 7, the air outlet pipe 7 is connected with the roasting furnace 1, and the fan 8 is arranged on the air outlet pipe 7. Under the action of the fan 8, the high-temperature air after heating is introduced into the roasting furnace 1 to heat the carbon anode, so that the energy utilization is realized.

[0030] In order to avoid energy waste, a circulating pump 10 is arranged on one side of the water storage tank 51, one end of the circulating pump 10 is connected with the hot water storage tank 5 through a first connecting water pipe 11, the other end is connected with a second connecting water pipe 12, and the repeated use of the circulating medium is realized.

[0031] Further, in order to make the high-temperature flue gas fully contact with the first disc-shaped tube 32, the first disc-shaped tube 32 is arranged along the flue gas flow direction.

[0032] Further, in order to improve the heat absorption capacity of the circulating medium in the first disc-shaped tube 32, heat-conducting fins 33 are uniformly arranged on the outer side of the first disc-shaped tube 32.

[0033] Further, in order to facilitate the contact between the high-temperature recycled medium after heat exchange and the second disc-shaped tube 52, the second disc-shaped tube 52 is arranged along the height direction of the water storage tank 51.

[0034] Further, in order to expand the contact area between the high-temperature recycled medium after heat exchange and the second disc-shaped tube 52 and improve the heat exchange efficiency of the inlet air, a water collecting tank 53 is arranged at the upper end of the inside of the water storage tank 51, the upper end of the water collecting tank 53 is connected with the connecting pipe 4, and the lower end of the water collecting tank 53 is uniformly arranged with a spray head 54.

[0035] In order to treat the high-temperature flue gas after heat exchange and meet the emission requirements, the system further comprises a flue gas treatment system 9, the flue gas treatment system 9 comprises a filtering assembly 91 and a desulfurization assembly 92, the filtering assembly 91 and the desulfurization assembly 92 are arranged on the flue gas pipeline 2 located at the upper end of the waste heat recovery mechanism 3, and the particulate matter and harmful gas in the purified flue gas.

[0036] The high-temperature flue gas waste heat utilization method of the roaster 1 is as follows: when the flue gas discharged from the roaster 1 passes through the waste heat recovery mechanism 3, the circulating medium of the first disc-shaped tube 32 in the waste heat recovery mechanism 3 exchanges heat with the high-temperature flue gas, so that the temperature of the circulating medium is increased, and the heated circulating medium enters the hot water storage tank 5, exchanges heat with the inlet air passing through the second disc-shaped tube 52 in the hot water storage tank 5, so that the inlet air is heated, and the hot air is extracted under the action of the fan 8 and introduced into the roaster 1 for heating the carbon anode.

[0037] In the above process, more than 60% of the waste heat can be effectively recovered by the waste heat utilization device, thereby reducing the consumption of natural gas and improving the energy utilization efficiency.

[0038] The parts of the application not described in detail are prior art, although embodiments of the application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the application, the scope of the application being defined by the appended claims and their equivalents.

Claims

1. Anode baking furnace waste heat utilization device for carbon anodes, characterized by: include: A roasting furnace (1) is used to roast carbon anodes; Waste heat recovery mechanism (3) is installed on flue gas duct (2) connected to roasting furnace (1) to absorb the heat of flue gas discharged from roasting furnace (1); Hot water storage tank (5) is connected to waste heat recovery mechanism (3) via connecting pipe (4) and is used to store the heat transferred by the circulating medium in waste heat recovery mechanism (3); An air inlet pipe (6) is provided at one end of the hot water storage tank (5), and the other end of the hot water storage tank (5) is connected to an air outlet pipe (7). The air outlet pipe (7) is connected to the roasting furnace (1), and a fan (8) is provided on the air outlet pipe (7) to heat the air entering the hot water storage tank (5) and then introduce it into the roasting furnace (1) to heat the carbon anode. The circulating pump (10) is connected to the hot water storage tank (5) at one end through the first connecting water pipe (11) and to the waste heat recovery mechanism (3) at the other end through the second connecting water pipe (12), so as to realize the reuse of the circulating medium.

2. The baking furnace waste heat utilization device for carbon anodes according to claim 1, characterized in that: The waste heat recovery mechanism (3) includes a recovery box (31) and a first disc tube (32). The first disc tube (32) is disposed inside the recovery box (31). One end of the first disc tube (32) is connected to a second connecting water pipe (12), and the other end of the first disc tube (32) is connected to a connecting pipe (4).

3. The baking furnace waste heat utilization device for carbon anodes according to claim 2, characterized in that: The first disc-shaped tube (32) is arranged along the flue gas flow direction.

4. The baking furnace waste heat utilization device for carbon anodes according to claim 2, characterized in that: The outer surface of the first disc tube (32) is evenly covered with heat-conducting fins (33).

5. The baking furnace waste heat utilization device for carbon anodes according to claim 1, characterized in that: The hot water storage tank (5) includes a water storage tank (51) and a second coiled tube (52). The second coiled tube (52) is located inside the water storage tank (51). The water storage tank (51) is located below the waste heat recovery mechanism (3). The air inlet pipe (6) is connected to one end of the second coiled tube (52), and the other end of the second coiled tube (52) is connected to the air outlet pipe (7).

6. The baking furnace waste heat utilization device for carbon anodes according to claim 5, characterized in that: The second disc-shaped tube (52) is set along the height direction of the water storage tank (51).

7. The baking furnace waste heat utilization device for carbon anodes according to claim 5, characterized in that: The upper part of the water storage tank (51) is provided with a water collection tank (53), the upper part of the water collection tank (53) is connected to the connecting pipe (4), and the lower part of the water collection tank (53) is evenly distributed with spray heads (54).

8. The baking furnace waste heat utilization device for carbon anodes according to claim 1, characterized in that: It also includes a flue gas treatment system (9), which includes a filter assembly (91) and a desulfurization assembly (92), which are mounted on the flue gas duct (2) located at the upper end of the waste heat recovery mechanism (3).

9. A method for utilizing waste heat of a device for utilizing waste heat of a baking furnace for carbon anodes according to any one of claims 1 to 8, characterized in that: When the flue gas discharged from the roasting furnace (1) passes through the waste heat recovery mechanism (3), the waste heat recovery mechanism (3) absorbs the heat in the flue gas and then transfers the heat to the hot water storage tank (5) through the circulating medium. After the hot water storage tank (5) exchanges heat with the air entering the roasting furnace, the high-temperature gas is introduced into the roasting furnace (1) to heat the carbon anode.

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