Graphite roller kiln carbonization and tail gas separation system

Abstract

The utility model discloses a graphite roller hearth kiln carbonization and tail gas separation system. The system includes roller hearth kiln, exhaust line and tar separation device, exhaust line includes first exhaust line and second exhaust line, the exhaust port of roller hearth kiln is connected with the air inlet of tar separation device through first exhaust line, the air outlet of tar separation device is connected with the air inlet of second exhaust line, tar separation device is oil storage tank, and the condensate pipe that communicates with external water cooling system is equipped with temperature control unit in oil storage tank, and the condensate pipe is arranged in vertical direction or horizontal direction parallel in the oil storage tank. The system can combine the carbonization workshop and existing device that has been built directly to reform and apply, and the large amount of tar existing in tail gas is separated out, thereby greatly improving the coking condition of tail gas tar in the furnace, and then reducing the energy loss and yield loss caused by the reheating of roller hearth kiln after temperature reduction and furnace cleaning.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of carbonization and tail gas separation system of graphite roller kiln. BACKGROUND

[0002] In the domestic lithium ion battery negative electrode material manufacturing industry, carbonization is widely used in the preparation of various fast-charging negative electrode materials as a method that can convert coating agent into carbon layer, build hard shell for graphite, improve the surface structure of graphitized particles and increase the charge-discharge channel. After traditional graphite material and pitch material are fully mixed, carbonization is carried out at 1000-1200℃ by roller kiln, which can exhibit excellent electrochemical performance and chemical stability. Therefore, the carbonization process is an indispensable process for high-end graphite negative electrode products. However, during the heating and carbonization process, solid or liquid pitch can produce volatile matter. When the temperature reaches 230-400℃, the decomposition rate of pitch material increases, and a large amount of volatile matter is discharged. When the temperature rises to 400-500℃, the decomposition and volatilization slow down, and pyrolysis and condensation occur, reducing the amount of volatile matter. Volatile matter is in the form of tail gas, which enters the electric precipitator after passing through the tail gas main of the roller kiln. There is a mixture of tar fumes and particulate matter in the tail gas. When the concentration of tail gas in the electric precipitator is too high, the treatment efficiency of the electric precipitator decreases, and high-concentration tail gas may flow back into the tail gas main and enter the roller kiln. There is a high-temperature zone in the roller kiln, and the temperature of this zone exceeds the tar coking temperature of the tail gas, resulting in the formation of block-shaped solid coke in the roller kiln and the adhesion of the coke to the heating rod, affecting the heating efficiency. In severe cases, it may cause short circuit of the heating rod, posing a safety hazard, and may also affect production output, reduce the service life of the roller kiln, and cause environmental pollution.

[0003] Chinese patent CN208949214U discloses a carbonization tail gas recovery, purification and separation system, but this system has many devices, a long construction period, a large floor space and a high cost, and is not suitable for modification in an existing carbonization workshop. UTILITY MODEL CONTENT

[0004] The utility model is to solve the defects in the prior art that the tail gas separation system of graphite roller kiln is complex, has a high cost, and is difficult to directly modify and apply in an existing carbonization workshop. The utility model provides a carbonization and tail gas separation system of graphite roller kiln. The carbonization graphite roller kiln tail gas separation system provided by the utility model can be directly modified and applied in combination with an existing carbonization workshop and existing devices, successfully solving the problems of limited modification space, time and cost. By separating a large amount of tar in the tail gas, the coking of tar in the furnace is greatly improved, and the energy loss and yield loss caused by reheating after temperature reduction and furnace cleaning are reduced.

[0005] The utility model discloses a graphite roller kiln carbonization and tail gas separation system through the following technical scheme to solve the above technical problem:

[0006] The utility model provides a kind of graphite roller kiln carbonization and tail gas separation system, the graphite roller kiln carbonization and tail gas separation system includes roller kiln, exhaust line and tar separation device;

[0007] The exhaust line includes first exhaust line and second exhaust line;The exhaust port of the roller kiln is connected with the gas inlet of the tar separation device by the first exhaust line;The gas outlet of the tar separation device is connected with the gas inlet of the second exhaust line;

[0008] The tar separation device is oil storage tank, temperature control unit and condensate pipe that are communicated with external water cooling system are equipped in the oil storage tank, the condensate pipe is arranged in vertical direction or horizontal direction in the oil storage tank parallelly.

[0009] In some preferred embodiments, the condensate pipe is arranged in vertical direction in the oil storage tank parallelly;The setting column number of the condensate pipe is 20-50 columns;Each column of the condensate pipe is arranged in horizontal direction with adjacent column of the condensate pipe or staggered.

[0010] In some preferred embodiments, the condensate pipe is arranged in horizontal direction in the oil storage tank parallelly;The setting row number of the condensate pipe is 20-50 rows;Each row of the condensate pipe is arranged in vertical direction with adjacent row of the condensate pipe or staggered.

[0011] In some preferred embodiments, the diameter of the condensate pipe is 1-3cm;The gap between every two adjacent condensate pipes in each row and / or each column is 1-3cm.

[0012] In some preferred embodiments, the oil storage tank includes first part and second part, the first part is arranged above the second part and is integrated structure with the second part;The height of the oil storage tank is 50-100cm;The height ratio of the first part and the second part is (2-3) : 1.

[0013] In some preferred embodiments, the first part is cuboid chamber, and the second part is inverted quadrangular pyramid chamber connected with the first part;The length of the cuboid chamber is 50-300cm;The width of the cuboid chamber is 50-150cm.

[0014] In some preferred embodiments, the bottom of the oil storage tank is provided with valve, and the valve is used to control the discharge of tar.

[0015] In some preferred embodiments, the exhaust port of the second exhaust pipeline is connected with a fan, and the fan is used to accelerate the flow of the exhaust gas generated in the roller kiln along the airflow direction.

[0016] In some preferred embodiments, the graphite roller kiln carbonization and exhaust separation system further comprises an exhaust treatment device, and the air inlet of the exhaust treatment device is connected with the air outlet of the fan.

[0017] In some preferred embodiments, the exhaust treatment device is an electric tar precipitator.

[0018] In the utility model, the external water cooling system can comprise a cooling tower and a water cooling system pipeline.

[0019] In the utility model, the exhaust refers to the volatile components discharged in the heating stage after the mixed asphalt graphite enters the roller kiln.

[0020] In the utility model, after the high-temperature exhaust gas contacts the condensate pipe in the oil storage tank, the tar in the exhaust gas is cooled and condensed to form liquid tar under the cold atmosphere and falls into the bottom of the oil storage tank, and the liquid tar is discharged through the valve at the bottom of the oil storage tank and is recycled. In this process, the low-temperature water in the cooling tower is input into the condensate pipe through the water cooling system pipeline, forming a cooling water circulation, the condensate pipe continuously cools the oil storage tank, and the high-temperature exhaust gas continuously enters the oil storage tank. Under the regulation of the temperature control unit, the temperature in the oil storage tank is kept lower than the temperature at which the tar is condensed into liquid tar and higher than the temperature at which the tar is formed into solid tar.

[0021] In the utility model, after the tar is separated by the oil storage tank, the remaining solid particle flue gas in the exhaust gas is discharged into the second exhaust pipeline and introduced into the electric tar precipitator through the fan for exhaust treatment.

[0022] The positive progress effect of the utility model lies in that:

[0023] (1) The graphite roller kiln carbonization and exhaust separation system provided by the utility model can be directly transformed and applied in combination with the built carbonization workshop and the existing device, successfully solving the problems of limited transformation space, time and cost, realizing the purpose of reducing pollution, reducing cost and improving the operating environment in the production process by separating a large amount of tar in the exhaust gas.

[0024] (2) The graphite roller kiln carbonization and exhaust separation system provided by the utility model can collect most of the tar in the exhaust gas, thereby greatly improving the coking of exhaust gas tar in the furnace, and further reducing the energy loss and yield loss caused by reheating after the roller kiln is cooled and cleaned.

[0025] (3) The graphite roller kiln carbonization and tail gas separation system can effectively alleviate the tail gas pressure of the subsequent tail gas treatment device (electrical tar catcher), slow down the frequency of maintaining the tail gas treatment device, further reduce the equipment maintenance cost, improve the production rhythm, and thus greatly improve the competitiveness of the product in the market.

[0026] (4) The graphite roller kiln carbonization and tail gas separation system makes most of the tar in the tail gas be collected and then be used for resource recycling research or sold, and the high-temperature water discharged from the condensate pipe can also be used for cleaning the calcium carbonate scale in the water cooling system pipeline of the roller kiln, thereby saving energy consumption. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 It is a top view structural schematic diagram (overall) of the graphite roller kiln carbonization and tail gas separation system of the embodiment 1 of the utility model.

[0028] Figure 2 It is a front view structural schematic diagram (part) of the graphite roller kiln carbonization and tail gas separation system of the embodiment 1 of the utility model.

[0029] Figure 3 It is a three-dimensional structural schematic diagram of the oil storage tank of the graphite roller kiln carbonization and tail gas separation system of the embodiment 1 of the utility model.

[0030] Figure 4 It is a left view structural schematic diagram of the oil storage tank of the graphite roller kiln carbonization and tail gas separation system of the embodiment 1 of the utility model.

[0031] Figure 5 It is a left view structural schematic diagram of the oil storage tank of the graphite roller kiln carbonization and tail gas separation system of the embodiment 2 of the utility model.

[0032] Figure 6 It is a left view structural schematic diagram of the oil storage tank of the graphite roller kiln carbonization and tail gas separation system of the embodiment 3 of the utility model.

[0033] Figure 7 It is a left view structural schematic diagram of the oil storage tank of the graphite roller kiln carbonization and tail gas separation system of the embodiment 4 of the utility model.

[0034] BRIEF DESCRIPTION OF DRAWINGS

[0035] Roller kiln 1

[0036] First exhaust pipe 21

[0037] Second exhaust pipe 22

[0038] Oil storage tank 31

[0039] Temperature control unit 32

[0040] Condensate pipe 33

[0041] Ball valve 4

[0042] Fan 5

[0043] Electrical tar precipitator 6

[0044] Water cooling system pipe 71

[0045] Cooling tower 72. DETAILED DESCRIPTION

[0046] The specific embodiments of the present application will be further described below with reference to the accompanying drawings. It should be noted that the description of these embodiments is used to help understand the present application, but does not constitute a limitation on the present application. In addition, the technical features involved in each embodiment of the present application described below can be combined with each other as long as they do not conflict with each other.

[0047] Example 1

[0048] The present embodiment discloses a graphite roller kiln carbonization and tail gas separation system, as shown in the figure, the graphite roller kiln carbonization and tail gas separation system comprises a roller kiln 1, an exhaust pipe and a tar separation device; Figures 1-4

[0049] The exhaust pipe comprises a first exhaust pipe 21 and a second exhaust pipe 22; the exhaust port of the roller kiln 1 is connected with the gas inlet of the tar separation device through the first exhaust pipe 21; the gas outlet of the tar separation device is connected with the gas inlet of the second exhaust pipe 22;

[0050] The tar separation device is an oil storage tank 31, which is provided with a temperature control unit 32 and a condensate pipe 33 communicating with an external water cooling system, and the condensate pipes 33 are arranged in parallel in the horizontal direction in the oil storage tank 31.

[0051] In the present embodiment, the condensate pipes 33 are arranged in parallel in the horizontal direction in the oil storage tank 31; the setting row number of the condensate pipes 33 is 25 rows; each row of condensate pipes 33 and the adjacent row of condensate pipes 33 are arranged in a staggered manner in the vertical direction.

[0052] In the present embodiment, the diameter of the condensate pipe 33 is 2 cm; the gap between each row and each column of adjacent two condensate pipes 33 is 2 cm.

[0053] In the present embodiment, the oil storage tank 31 comprises a first part and a second part, the first part is arranged above the second part and is an integral structure with the second part; the height of the oil storage tank 31 is 100 cm; the height ratio of the first part to the second part is 7:3.

[0054] ​In this embodiment, the first part is a cuboid chamber, and the second part is an inverted quadrangular pyramid chamber connected with the first part; the length of the cuboid chamber is 200 cm; and the width of the cuboid chamber is 100 cm.

[0055] In this embodiment, the bottom of the oil storage tank 31 is provided with a ball valve 4, which is used to control the discharge of the tar.

[0056] In this embodiment, the exhaust port of the second exhaust pipeline 22 is connected with a fan 5, which is used to promote the accelerated flow of the tail gas generated in the roller hearth furnace 1 along the airflow direction.

[0057] In this embodiment, the graphite roller hearth furnace carbonization and tail gas separation system further comprises a tail gas treatment device; the gas inlet of the tail gas treatment device is connected with the exhaust port of the fan 5.

[0058] In this embodiment, the tail gas treatment device is an electric tar precipitator 6.

[0059] In this embodiment, the external water cooling system comprises a cooling tower 72 and a water cooling system pipeline 71.

[0060] The working process of the graphite roller hearth furnace carbonization and tail gas separation system in this embodiment is as follows:

[0061] In this embodiment, the high-temperature tail gas generated in the roller hearth furnace 1 of the condensation and collection tar device of the carbonized graphite roller hearth furnace is discharged into the oil storage tank 31 through the first exhaust pipeline 21; in this process, the low-temperature water in the cooling tower 72 is input into the condensation water pipe 33 through the water cooling system pipeline 71 to form a cooling water circulation, the condensation water pipe 33 continuously cools the oil storage tank 31, and the high-temperature tail gas continuously enters the oil storage tank 31; under the regulation of the temperature control unit 32, the temperature in the oil storage tank 31 is kept lower than the temperature at which the tar condenses into liquid tar and higher than the temperature at which the tar forms solid tar; the tar separated by the oil storage tank 31 is discharged from the oil storage tank 31 through the ball valve 4, and the remaining solid particles in the tail gas are discharged into the second exhaust pipeline 22 and introduced into the electric tar precipitator 6 through the fan 5 for tail gas treatment.

[0062] In this embodiment, the coking condition in the roller hearth furnace 1 is obviously improved, and about 65% of the tar is collected for recycling or sale.

[0063] Embodiment 2

[0064] As shown in Figure 5 In this embodiment, the condensation water pipes 33 are arranged in parallel in the horizontal direction in the oil storage tank 31; the setting rows of the condensation water pipes 33 are 25 rows; and each row of condensation water pipes 33 is arranged in alignment with the adjacent row of condensation water pipes 33 in the vertical direction. Other settings are the same as those in Embodiment 1.

[0065] In this embodiment, the condensate pipes 33 are arranged horizontally and aligned. Since tar is viscous, adjusting the condensate pipes 33 to be aligned will increase the oil discharge speed, and the tar filtration rate is about 75%.

[0066] Example 3

[0067] like Figure 6 As shown, in this embodiment, the condensate pipes 33 are arranged vertically in parallel within the oil storage tank 31; the number of columns of condensate pipes 33 is 50; each column of condensate pipes 33 is staggered with the adjacent column of condensate pipes 33 in the horizontal direction. Other arrangements are the same as in Embodiment 1.

[0068] In this embodiment, the condensate pipes 33 are arranged vertically and staggered. Due to the staggered arrangement of the condensate pipes 33 and the gravity of the tar, the tar filtration rate is greatly increased to about 92%. However, at this time, the staggered condensate pipes are denser than the aligned ones, and the working pressure of the subsequent blower 5 continues to increase. In addition, it is easy to cause the furnace pressure in the roller kiln 1 to be too high.

[0069] Example 4

[0070] like Figure 7 As shown, in this embodiment, the condensate pipes 33 are arranged vertically in parallel within the oil storage tank 31; the number of columns of condensate pipes 33 is 50; each column of condensate pipes 33 is aligned vertically with the adjacent column of condensate pipes 33. Other arrangements are the same as in Embodiment 3.

[0071] In this embodiment, the condensate pipes 33 are arranged vertically and aligned, with a tar filtration rate of about 90%. The remaining small amount of tar enters the subsequent electrostatic precipitator 6 along with the exhaust gas for treatment, and the processing pressure of the electrostatic precipitator 6 is greatly reduced.

[0072] While specific embodiments of this utility model have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of this utility model is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of this utility model, but all such changes and modifications fall within the scope of protection of this utility model.

Claims

1. A carbonization and off-gas separation system for a graphite roller hearth kiln, characterized by, The graphite roller kiln carbonization and tail gas separation system comprises a roller kiln, an exhaust pipeline and a tar separation device. The exhaust pipeline comprises a first exhaust pipeline and a second exhaust pipeline; an exhaust port of the roller kiln is connected with an air inlet of the tar separation device through the first exhaust pipeline; an air outlet of the tar separation device is connected with an air inlet of the second exhaust pipeline. The tar separation device is an oil storage tank, which is provided with a temperature control unit and a condensate water pipe in communication with an external water cooling system; the condensate water pipes are arranged in parallel in a vertical direction or a horizontal direction in the oil storage tank.

2. The carbonization and off-gas separation system for a graphite roller hearth kiln according to claim 1, characterized in that, The condensate water pipes are arranged in parallel in a vertical direction in the oil storage tank; the number of columns of the condensate water pipes is 20-50; each column of the condensate water pipes is arranged in alignment or staggered with an adjacent column of the condensate water pipes in a horizontal direction.

3. The carbonization and off-gas separation system for a graphite roller hearth kiln according to claim 1, wherein The condensate water pipes are arranged in parallel in a horizontal direction in the oil storage tank; the number of rows of the condensate water pipes is 20-50; each row of the condensate water pipes is arranged in alignment or staggered with an adjacent row of the condensate water pipes in a vertical direction.

4. The carbonization and off-gas separation system for a graphite roller hearth kiln as claimed in claim 1, wherein, The diameter of the condensate water pipe is 1-3 cm. The gap between each row and / or each column of adjacent two condensate water pipes is 1-3 cm.

5. The carbonization and off-gas separation system for a graphite roller hearth kiln of claim 1, wherein, The oil storage tank comprises a first part and a second part; the first part is arranged above the second part and is an integral structure with the second part. The height of the oil storage tank is 50-100 cm; the height ratio of the first part to the second part is (2-3):

1.

6. The carbonization and off-gas separation system for a graphite roller hearth kiln according to claim 5, characterized in that, The first part is a cuboid chamber, and the second part is an inverted quadrangular pyramid chamber connected with the first part. The length of the cuboid chamber is 50-300 cm; the width of the cuboid chamber is 50-150 cm.

7. The carbonization and off-gas separation system for a graphite roller hearth kiln of claim 1, wherein, The bottom of the oil storage tank is provided with a valve for controlling the discharge of tar.

8. The carbonization and off-gas separation system for a graphite roller hearth kiln of claim 1, wherein, The air outlet of the second exhaust pipeline is connected with a fan for accelerating the flow of the tail gas generated in the roller kiln along the air flow direction.

9. The carbonization and off-gas separation system for a graphite roller hearth kiln according to claim 8, characterized in that, The graphite roller kiln carbonization and tail gas separation system further comprises a tail gas treatment device; the air inlet of the tail gas treatment device is connected with the air outlet of the fan.

10. The carbonization and off-gas separation system for a graphite roller hearth kiln of claim 9, wherein, The tail gas treatment device is an electric tar precipitator.

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