Smoke collecting device of graphitization furnace

Abstract

According to the flue gas collecting device for the graphitization furnace, the gas collecting hood is arranged above the graphitization furnace to collect flue gas generated in the raw material graphitization process, the flue gas is transferred into the dust remover for dust removal, then the flue gas subjected to dust removal is subjected to desulfurization and water washing in sequence, sulfur oxides in the flue gas are removed, and the flue gas is discharged into the graphitization furnace. And inputting the washed flue gas into an absorption tower, and absorbing hydrocarbon substances in the flue gas by using an organic solvent in the absorption tower to realize recovery. According to the device disclosed by the invention, the flue gas exhausted by the graphitization furnace is purified in manners of dust removal, desulfurization and the like through matched use of the equipment, and then is absorbed and enriched by utilizing an organic solvent, so that the flue gas of the graphitization furnace is collected; the defect that in an existing graphitization furnace flue gas treatment mode, the graphitization furnace flue gas is treated after being incinerated, and consequently resources are wasted is overcome.

Description

Technical Field

[0001] This application relates to the technical field of waste gas collection and treatment, and particularly to a flue gas collection device for a graphitization furnace. Background Art

[0002] Graphitization of the anode material is a process in which non-graphitic carbon is heat-treated at high temperature. By fully utilizing the resistance heat, the carbonaceous material is heated to 2300 - 3000 °C to be transformed into graphitic carbon with a three-dimensional regular and ordered graphite structure, so that the carbon with an amorphous turbostratic structure is transformed into an ordered graphite crystalline structure.

[0003] The Acheson furnace crucible method is the current mainstream production process for graphitization. Its production process mainly includes: evenly putting the anode material into a graphite crucible, then putting the crucible into a graphitization furnace, putting resistance material around the graphite crucible at the furnace core, and then covering it with heat-insulating material to fill the furnace body, completing the furnace loading. After the furnace body is filled, it enters the electric heating process. Through the electrodes on both sides of the graphitization furnace, electric current is passed for heating, and the temperature in the furnace is raised to 2800 - 3000 °C. Under high-temperature heat treatment, the carbon-containing substances in the crucible reduce the impurities at the edges of the amorphous carbon microcrystalline structure, making it have the characteristics of a graphite crystal structure.

[0004] The materials for graphitization mainly include graphitizable carbon such as petroleum coke and needle coke. During the heating process of the graphitization furnace (in the temperature range of 200 - 500 °C), due to heat, the volatile components (mainly hydrocarbon organic compounds), moisture, and soot in it form flue gas and are discharged. Some production enterprises directly discharge the flue gas, but this method obviously does not meet the environmental protection requirements. Therefore, some enterprises will pass the flue gas into a corresponding combustion furnace, burn the flue gas and combine it with the tail gas of the combustion furnace for treatment. Although this method can solve the problem of environmental pollution caused by direct discharge of flue gas, this method fails to recover the recyclable substances in the flue gas, such as organic hydrocarbon compounds, thus resulting in waste of resources. Utility Model Content

[0005] This application provides a flue gas collection device for a graphitization furnace to solve the problem of resource waste caused by the existing treatment of burning the flue gas of the graphitization furnace.

[0006] This application provides a flue gas collection device for a graphitization furnace, including a graphitization furnace, a dust collector, a draft fan, a desulfurization tower, a water washing tower, and an absorption tower connected in series in sequence;

[0007] A gas collection hood is arranged on the graphitization furnace, and the gas output end of the gas collection hood is connected to the gas input end of the dust collector.

[0008] Optionally, the desulfurization tower is also connected in series with a filter press and a gypsum storage bin in sequence;

[0009] The filter press is also connected to a filtrate storage tank, and the filtrate storage tank is also connected to the desulfurization tower.

[0010] Optionally, the water washing tower is also connected to a filtrate storage tank.

[0011] Optionally, the absorption tower is also connected to an off-gas treatment device.

[0012] Optionally, the lower end face of the gas collecting hood is open, and the upper end face is provided with an air outlet and is connected to the gas input end of the dust collector;

[0013] Inside the gas collecting hood, a cooler is arranged to divide the gas collecting hood into an upper chamber and a lower chamber that communicate with each other;

[0014] The cooler includes a water inlet header and a water outlet header fixed to opposite side faces of the gas collecting hood;

[0015] The water inlet header and the water outlet header are connected through a plurality of cooling plates arranged at intervals;

[0016] The cooling plates are of a hollow structure and are arranged vertically.

[0017] Optionally, the gas collecting hood is also connected to a heat pump;

[0018] The water inlet header is connected to a water supply device through a water inlet pipe, and the water outlet header is connected to the heat pump through a water outlet pipe;

[0019] Both the water inlet pipe and the water outlet pipe are respectively arranged through the side face of the gas collecting hood.

[0020] Optionally, adjacent cooling plates are connected through a plurality of vertically arranged fins.

[0021] The present application provides a device for collecting flue gas of a graphitization furnace. By arranging a gas collecting hood above the graphitization furnace, the flue gas generated during the graphitization process of raw materials is collected and transferred to a dust collector for dust removal. Then, the dust-removed flue gas is successively subjected to desulfurization and water washing to remove sulfur oxides in the flue gas. Then, the water-washed flue gas is input into an absorption tower, and the hydrocarbon substances in the flue gas are absorbed by an organic solvent in the absorption tower for recovery. Through the combined use of the above-mentioned equipment, the flue gas discharged from the graphitization furnace is purified through dust removal, desulfurization, etc., and then enriched by absorption with an organic solvent, realizing the collection of the flue gas of the graphitization furnace, and overcoming the drawback of resource waste caused by burning and treating the flue gas of the graphitization furnace in the existing methods for treating the flue gas of the graphitization furnace. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0023] Figure 1 Schematic diagram of a flue gas collection device for a graphitization furnace provided by an embodiment of the present application;

[0024] Figure 2 Schematic diagram of a flue gas collection device for a graphitization furnace provided by another embodiment of the present application;

[0025] Figure 3 Schematic diagram of a flue gas collection device for a graphitization furnace provided by yet another embodiment of the present application;

[0026] Figure 4 Schematic diagram of the three-dimensional structure of a gas hood provided by an embodiment of the present application;

[0027] Figure 5 Schematic diagram of the bottom view structure of a gas hood provided by an embodiment of the present application;

[0028] Figure 6 Schematic diagram of the three-dimensional structure of a cooler provided by an embodiment of the present application;

[0029] Figure 7 Schematic diagram of a flue gas collection device for a graphitization furnace provided by still another embodiment of the present application.

[0030] Explanation of reference numerals:

[0031] 1, Graphitization furnace; 2, Dust collector; 3, Induced draft fan; 4, Desulfurization tower; 5, Water scrubber; 6, Absorption tower; 7, Gas hood; 8, Tail gas treatment device; 9, Heat pump; 41, Filter press; 42, Gypsum storage bin; 43, Filtrate storage tank; 71, Cooler; 72, Water header; 73, Outlet water header; 74, Cooling plate; 701, Gas outlet; 7201, Water inlet pipe; 7301, Water outlet pipe. Detailed implementation manners

[0032] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below. Apparently, the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without making creative efforts also belong to the scope of protection of the present application.

[0033] As Figure 1 shown, the present application provides a flue gas collection device for a graphitization furnace, including a graphitization furnace 1, a dust collector 2, an induced draft fan 3, a desulfurization tower 4, a water scrubber 5, and an absorption tower 6 connected in series in sequence;

[0034] A gas hood 7 is provided on the graphitization furnace 1, and the gas output end of the gas hood 7 is connected to the gas input end of the dust collector 2.

[0035] In this application, the absorption tower 6 can also be connected to a desorption tower, and the flue gas enriched in the absorption liquid is released by heating, distillation, etc., and then recovered.

[0036] During use, the raw material to be graphitized (such as pitch coke) is added to the graphitization furnace 1, heating is started, and the temperature in the furnace is raised. During the heating-up process, the raw material gradually loses weight (the weight loss temperature range is in the interval of 200-500 °C), and the volatile components, water, sulfides, etc. in it gradually gasify to form flue gas, and these flue gases are discharged through the flue gas outlet provided on the graphitization furnace 1. At the same time, the induced draft fan 3 is turned on to draw air through the dust collector 2 into the gas hood 7, and the flue gas discharged from the graphitization furnace 1 enters the gas hood 7 from bottom to top.

[0037] The flue gas is sucked and collected by the gas hood 7, and then discharged into the dust collector 2 for dust removal. In this application, the dust collector 2 is a cyclone dust collector, an electrostatic precipitator or a bag filter, etc. The flue gas after dust removal by the dust collector 2 will contain sulfur dioxide (generated by the reaction of sulfides and oxygen at high temperature). First, the flue gas is input into the desulfurization tower 4 and circulated and sprayed with lime milk as a desulfurizing agent for washing. The flue gas after desulfurization washing will contain a small amount of desulfurizing agent. Then, the desulfurized flue gas is input into the water washing tower 5 for water washing to remove the alkaline desulfurizing agent therein, and then the water-washed flue gas is input into the absorption tower 6 to absorb the hydrocarbon substances in the flue gas by using a solvent such as paraffin oil, and the unabsorbed gases such as hydrogen are discharged from the absorption tower 6 to corresponding tail gas treatment equipment for harmless treatment.

[0038] This application provides a device for collecting graphitization furnace flue gas. By arranging a gas hood 7 above the graphitization furnace 1, the flue gas generated during the graphitization process of the raw material is collected and transferred to the dust collector 2 for dust removal. Then, the dust-removed flue gas removes sulfur oxides in the flue gas successively through desulfurization and water washing processes, and then the water-washed flue gas is input into the absorption tower 6, and the hydrocarbon substances in the flue gas are absorbed by the organic solvent in the absorption tower 6 for recovery. Through the combined use of the above-mentioned equipment, the flue gas discharged from the graphitization furnace is purified through dust removal, desulfurization, etc., and then enriched by absorption with an organic solvent, realizing the collection of graphitization furnace flue gas, and overcoming the drawback of resource waste caused by burning and treating the graphitization furnace flue gas in the existing methods for treating graphitization furnace flue gas.

[0039] As Figure 2 shown, optionally, the desulfurization tower 4 is also connected in series with a filter press 41 and a gypsum storage bin 42 in sequence;

[0040] The filter press 41 is also connected to a filtrate storage tank 43, and the filtrate storage tank 43 is also connected to the desulfurization tower 4.

[0041] In this application, the product generated after desulfurization in the desulfurization tower 4 is mainly calcium sulfate, i.e., gypsum, which is input into the filter press 41 for pressure filtration and dehydration to separate the gypsum from the water. The separated filter cake, i.e., the gypsum solid, is temporarily stored in the gypsum storage bin 42, while the separated filtrate is transferred to the filtrate storage tank 43 for temporary storage, used for preparing lime milk, and then reused in the desulfurization tower 4.

[0042] As Figure 2 shown, optionally, the water washing tower 5 is also connected to the filtrate storage tank 43.

[0043] In this application, the washing water that has washed the desulfurizer in the flue gas in the water washing tower 5 can be input into the filtrate storage tank 43 and combined with the filtrate obtained from the filter press 41 for preparing the desulfurizer.

[0044] As Figure 3 shown, optionally, the absorption tower 6 is also connected to the tail gas treatment device 8.

[0045] In this application, the unabsorbed gases such as hydrogen are discharged from the absorption tower 6 to the tail gas treatment device 8 for treatment. In this application, the tail gas treatment device 8 is, for example, an incinerator, and the tail gas is harmlessly treated and then centrally treated.

[0046] As Figures 4 to 6 shown, optionally, the lower end face of the gas collecting hood 7 is open, and the upper end face is provided with an air outlet 701 and is connected to the gas input end of the dust collector 2;

[0047] Inside the gas collecting hood 7, the temperature reducer 71 divides the gas collecting hood 7 into an upper chamber and a lower chamber that communicate with each other;

[0048] The temperature reducer 71 includes a water inlet header 72 and a water outlet header 73 fixed to the opposite sides of the gas collecting hood 7;

[0049] The water inlet header 72 and the water outlet header 73 are connected by a plurality of spaced cooling plates 74;

[0050] The cooling plate 74 is of a hollow structure and is vertically arranged.

[0051] In this application, during use, the induced draft fan 3 is turned on to draw air from the dust collector 2 into the gas collecting hood 7, and the flue gas discharged from the graphitization furnace 1 enters the gas collecting hood 7 from bottom to top.

[0052] Meanwhile, supply cooling water (room temperature is fine) to the cooler 71. The cooling water enters the water inlet header 72, and then is distributed to a plurality of vertically arranged cooling plates 74 through the water inlet header 72. The flue gas entering the gas collection hood 7 ascends through the gap between the cooling plates 74 from the lower chamber of the gas collection hood 7, contacts the cooling plates 74 for heat exchange, reduces the temperature of the flue gas, and the temperature of the cooling water after heat exchange rises. The cooling water enters the water outlet header 73 from the cooling plates 74 and is output from the water outlet header 73 to the corresponding heat-using equipment.

[0053] The flue gas cooled by the cooler 71 in the gas collection hood 7 is discharged from the gas outlet 701 at the top of the gas collection hood 7 and enters the dust collector 2 for dust removal.

[0054] As Figure 6 and Figure 7 shown, optionally, the gas collection hood 7 is also connected to the heat pump 9;

[0055] The water inlet header 72 is connected to the water supply device through the water inlet pipe 7201, and the water outlet header 73 is connected to the heat pump 9 through the water outlet pipe 7301;

[0056] Both the water inlet pipe 7201 and the water outlet pipe 7301 are respectively arranged through the side surface of the gas collection hood 7.

[0057] In this application, during use, the temperature of the cooling water in the cooling plates 74 rises after heat exchange, enters the water outlet header 73 from the cooling plates 74, and is then transported to the heat pump 9 through the water outlet pipe 7301. The heat therein is recovered and utilized to generate high-grade heat, and the heat pump 9 supplies the high-grade heat to other heat-using equipment for utilization.

[0058] Optionally, adjacent cooling plates 74 are connected by a plurality of vertically arranged fins.

[0059] In this application, the fins between adjacent cooling plates 74 will strengthen the heat exchange process so that the heat in the flue gas can be fully absorbed by the cooling plates 74.

[0060] A flue gas collection device for a graphitization furnace has the following working process:

[0061] During use, add the raw material to be graphitized (such as pitch coke) into the graphitization furnace 1, start heating, raise the temperature inside the furnace. During the heating-up process, the raw material gradually loses weight (the weight loss temperature range is in the interval of 200 - 500 °C), and the volatiles, water, sulfides, etc. therein gradually gasify to form flue gas, and these flue gases are discharged through the flue gas outlet provided on the graphitization furnace 1. At the same time, start the induced draft fan 3 to draw air from the dust collector 2 to the gas collection hood 7, and the flue gas discharged from the graphitization furnace 1 enters the gas collection hood 7 from bottom to top.

[0062] At the same time, cooling water (room temperature is fine) is supplied to the cooler 71. The cooling water enters the water inlet header 72 from the water inlet pipe 7201, and then is distributed to a plurality of vertically arranged cooling plates 74 through the water inlet header 72. The flue gas entering the gas collecting hood 7 ascends through the gap between the cooling plates 74 from the lower chamber of the gas collecting hood 7, contacts the cooling plates 74 for heat exchange, reduces the temperature of the flue gas. At the same time, the fins between adjacent cooling plates 74 will enhance the heat exchange process. The temperature of the cooling water after heat exchange rises and enters the water outlet header 73 from the cooling plates 74, and is input into the heat pump 9 through the water outlet pipe 7301 to recover the heat therein and generate high-grade heat. The heat pump 9 then supplies the high-grade heat to other heat-using equipment for utilization.

[0063] The flue gas cooled by the cooler 71 in the gas collecting hood 7 is discharged from the air outlet 701 at the top of the gas collecting hood 7 and enters the dust collector 2 for dust removal. In this application, the dust collector 2 is a cyclone dust collector, an electrostatic dust collector or a bag dust collector, etc. The flue gas after dust removal by the dust collector 2 will contain sulfur dioxide (generated by the reaction of sulfide and oxygen at high temperature). First, the flue gas is input into the desulfurization tower 4 and circulated and sprayed with lime milk as the desulfurizing agent for washing. The flue gas after desulfurization washing will contain a small amount of desulfurizing agent. Then, the desulfurized flue gas is input into the water washing tower 5 for water washing to remove the alkaline desulfurizing agent therein. Then, the water-washed flue gas is input into the absorption tower 6 and washed with a solvent (such as paraffin oil) to absorb the hydrocarbon substances in the flue gas. The unabsorbed gases such as hydrogen are discharged from the absorption tower 6 to the tail gas treatment device 8 for treatment. In this application, the tail gas treatment device 8 is, for example, an incinerator, and the tail gas is harmlessly treated and then centrally treated.

[0064] The main product generated after desulfurization in the desulfurization tower 4 is calcium sulfate, that is, gypsum. It is input into the filter press 41 for pressure filtration and dehydration to separate the gypsum and water. The separated filter cake, that is, the gypsum solid, is stored in the gypsum storage bin 42 for temporary storage, and the separated filtrate is transferred to the filtrate storage tank 43 for temporary storage to be used for preparing lime milk, and then used for the desulfurization tower 4 for reuse.

[0065] The washing water that has washed the desulfurizing agent in the flue gas in the water washing tower 5 can be input into the filtrate storage tank 43 and merged with the filtrate obtained by the filter press 41 for preparing the desulfurizing agent.

[0066] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A graphitization furnace fume collection device, characterized in that: It comprises a graphitization furnace (1), a dust collector (2), an induced draft fan (3), a desulfurization tower (4), a water washing tower (5) and an absorption tower (6) which are connected in series in sequence; The graphitization furnace (1) is provided with a gas collecting hood (7), and the gas output end of the gas collecting hood (7) is connected to the gas input end of the dust collector (2).

2. The graphitization furnace fume collection device according to claim 1, characterized in that: The desulfurization tower (4) is also connected in series with the filter press (41) and the gypsum storage bin (42); The filter press (41) is also connected to a filtrate storage tank (43), and the filtrate storage tank (43) is also connected to a desulfurization tower (4).

3. The graphitization furnace fume collection device according to claim 2, characterized in that: The water washing tower (5) is also connected to the filtrate storage tank (43).

4. The graphitization furnace fume collection device according to claim 1, characterized in that: The absorption tower (6) is also connected to a tail gas treatment device (8).

5. The graphitization furnace fume collection device according to any one of claims 1 to 4, characterized in that: The lower end surface of the gas collecting hood (7) is open, and the upper end surface is provided with a gas outlet (701) which is connected to the gas input end of the dust collector (2); The gas collecting hood (7) is divided into an upper chamber and a lower chamber which are interconnected by a cooler (71) provided inside the gas collecting hood (7); The cooler (71) comprises a water inlet header (72) and a water outlet header (73) fixed to opposite sides of the air collecting hood (7); The water inlet header (72) and the water outlet header (73) are connected via a plurality of cooling plates (74) arranged at intervals; The cooling plate (74) is a hollow structure and is arranged vertically.

6. The graphitization furnace fume collection device according to claim 5, characterized in that: The gas collecting hood (7) is also connected to a heat pump (9); The water inlet header (72) is connected to the water supply device via a water inlet pipe (7201), and the water outlet header (73) is connected to the heat pump (9) via a water outlet pipe (7301); The water inlet pipe (7201) and the water outlet pipe (7301) are respectively arranged through the side surfaces of the air collecting hood (7).

7. The graphitization furnace fume collection device according to claim 5, characterized in that: Adjacent cooling plates (74) are connected via a plurality of vertically arranged fins.

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