Waste gas environment-friendly treatment device and method based on black method adsorption

Abstract

The invention discloses an environment-friendly waste gas treatment device based on black adsorption and a method thereof, and mainly relates to carbon production. Comprising a waste gas pipeline connected with a roasting furnace, a flame arrester connected with the waste gas pipeline, a reactor connected with the flame arrester through a pipeline, a purified powder adding assembly connected with the reactor through a pipeline, a powder treatment assembly connected with the reactor through a pipeline, and an adsorption assembly connected with the powder treatment assembly through a pipeline, the forming part is connected with the adsorption assembly through a pipeline. The device has the beneficial effects that the problems of low efficiency, generation of micro waste products and the like of an electrical tar precipitator are solved, calcined petroleum coke powder is sprayed into a pipeline at a high speed through an ejector and is fully mixed with waste gas, and after being fully mixed, the calcined petroleum coke powder enters cloth bag dust removal equipment to be filtered and adsorbed; and the filtered calcined petroleum coke powder adsorbing the waste gas is conveyed into a forming workshop through auger conveying equipment, and ingredients are added again in the forming workshop as a formula of an anode carbon block to prepare a green anode carbon block.

Description

Technical Field

[0001] The present invention relates to the field of carbon production, and in particular to an environmentally friendly waste gas treatment device and method based on black process adsorption. Background Art

[0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] Anode carbon block refers to a carbon block produced with petroleum coke and asphalt coke as aggregates and coal tar as binder. It is used as anode material for prebaked aluminum electrolytic cells. Anode carbon block is known as the "heart" of large electrolytic cells. Its quality directly affects the normal production of electrolytic aluminum and the improvement of technical indicators. The quality of anode carbon block is particularly important. For the production process of anode carbon block, the petroleum coke raw material needs to be calcined first to discharge the moisture and volatile matter in the raw material so that the volume of the carbon raw material can be fully shrunk. During calcination, the volatile matter is discharged, the molecular structure changes continuously, and the volume of the raw material itself gradually shrinks, thereby increasing the density and mechanical strength of the raw material, and reducing the resistivity of the calcined petroleum coke. After calcination, petroleum coke is also called "calcined coke". After being transported and mixed with asphalt, it is crushed and then vibrated into shape by a vibration molding machine. The formed carbon blocks are green blocks. Then, the green blocks and metallurgical colloid particles are roasted together at a certain heating rate. After roasting, the strength and conductivity of the carbon blocks are enhanced. The exhaust gas generated is treated by a series of processes such as electric tar precipitator, desulfurization and denitrification, and then discharged into the atmosphere after meeting the standards.

[0004] It has been found in production and practice, as well as with the improvement of environmental awareness in enterprises, that it is insufficient to use electrostatic precipitators to treat pollutants in exhaust gas generated after roasting. First of all, electrostatic precipitators use the adsorption force generated by the high-voltage electric field after the electrodes are energized to capture dust and tar in the gas. However, when the exhaust gas after roasting is treated by electrostatic precipitators, its dust removal efficiency is low, and the tar produced by the electrostatic precipitator is easy to clog. The most critical thing is that the electrostatic precipitator cannot treat harmful gases in the exhaust gas, because coal tar is used as a binder in the production process of anode carbon blocks. When the asphalt is heated, the asphalt will produce asphalt smoke gas (harmful substances such as toluene and benzopyrene) and VOCs (volatile organic compounds), but for gases, electrostatic precipitators cannot be treated, so the exhaust gas treatment method needs to be improved.

[0005] Now, black adsorption is used to treat the waste gas generated by roasting. According to the application number: CN202210886491.9, the name is: A black adsorption device and method for roasting furnace flue gas. The above application uses metallurgical coke powder as an adsorbent for flue gas. After the waste gas is adsorbed, coke powder is formed. A binder is added to the coke powder. The coke powder is granulated by a granulation system and can be returned to the roasting filler again to achieve the entire industrial chain cycle. The above application has the following disadvantages: 1. The main active ingredient is charcoal, and the adsorption of charcoal is used to adsorb harmful gases. For metallurgical coke powder as an adsorbent for flue gas, the carbon content in the metallurgical coke powder is not very high and contains other impurities and other components. The carbon content is about 70%, so the adsorption effect of metallurgical coke powder is not the best. 2. For the coke powder formed after the waste gas adsorption, it is necessary to add a binder to the coke powder and then granulate it through a granulation system before it can be reused. Based on the above disadvantages, it is improved. Summary of the invention

[0006] The purpose of the present invention is to provide an environmentally friendly waste gas treatment device and method based on black method adsorption. It uses black method adsorption to replace the traditional electric tar collector, solves the problems of low efficiency of the electric tar collector and the generation of micro-waste products, and sprays the calcined petroleum coke powder into the pipeline at high speed through an injector and fully mixes it with the waste gas. After fully mixing, it enters the bag dust removal equipment and then filters and adsorbs it. The filtered calcined petroleum coke powder that adsorbs the waste gas is transported to the molding workshop through the auger conveying equipment, and is used as the formula of the anode carbon block in the molding workshop. The ingredients are re-added to make raw anode carbon blocks. The gas filtered by the bag dust removal will be further processed by the desulfurization and denitrification equipment in the park, thereby realizing a closed loop in the entire waste gas treatment process, thereby achieving green emissions.

[0007] In order to achieve the above object, the present invention is implemented through the following technical solutions: The waste gas environmental protection treatment device based on black method adsorption includes a waste gas pipeline connected to the roasting furnace, a flame arrester connected to the waste gas pipeline, a reactor connected to the flame arrester through a pipeline, a clean powder adding component connected to the reactor through a pipeline, a powder processing component connected to the reactor through a pipeline, an adsorption component connected to the powder processing component through a pipeline, and a molding part connected to the adsorption component through a pipeline; the clean powder adding component is connected to the molding bin of the molding part through a pipeline, and the clean powder adding component includes a clean powder bin connected to the molding part and an induced draft fan; the induced draft fan transports the calcined petroleum coke powder in the clean powder bin to the reactor In the reactor, the clean powder bin is connected to the reactor and the pipelines at the two locations are provided with jet components; the powder processing component comprises a plurality of pulse bag dust removal devices and an auger conveying component connected to the pulse bag dust removal devices; the air inlet pipeline of the pulse bag dust removal is connected to the reactor, and the air outlet pipeline of the pulse bag dust removal is connected to the exhaust gas treatment equipment; the forming section is a forming workshop in the anode carbon block production line, and the forming section comprises a plurality of forming bins, and calcined petroleum coke powder is contained in the forming bins. The calcined petroleum coke powder is used as the adsorption medium in the reactor and is fully mixed with the exhaust gas in the reactor after being conveyed.

[0008] An elevator and an adsorption bin connected to the elevator are provided between the forming part and the adsorption assembly. A feeding valve is provided in the adsorption bin to control the quantitative addition of calcined petroleum coke powder adsorbed with waste gas into the forming part after the waste gas is adsorbed.

[0009] It also includes an explosion-proof component, which is connected to the reactor and the pulse bag dust removal equipment, and the explosion-proof component is a nitrogen generator.

[0010] The particle size of the calcined petroleum coke powder is 0.7-0.8 mm.

[0011] The method for using the waste gas environmental protection treatment device based on black process adsorption, S1, the calcined petroleum coke powder in the forming bin is transported to the clean powder bin, and then transported to the reactor by the pressurized jet of the clean powder bin to mix and contact with the waste gas in the waste gas pipeline; S2, after the calcined petroleum coke powder is fully mixed with the waste gas in the reactor, the waste gas and the calcined petroleum coke powder enter the pulse bag dust collector, and the pulse bag dust collector separates the adsorbed gas from the calcined petroleum coke powder; S3, the adsorbed gas flows from the outlet pipe of the pulse bag dust collector to the exhaust gas treatment equipment and is finally discharged into the atmosphere; the calcined petroleum coke powder adsorbed with waste gas is filtered out and transported to the inside of the adsorption bin through the auger conveying component and the elevator, and the calcined petroleum coke powder adsorbed with waste gas is quantitatively added to the forming part through the feeding valve.

[0012] Compared with the prior art, the beneficial effects of the present invention are: The traditional electric tar collector is replaced by black adsorption, which solves the problems of low efficiency of electric tar collector and generation of micro-waste products. The calcined petroleum coke powder is sprayed into the pipeline at high speed through the ejector and fully mixed with the waste gas. After fully mixed, it enters the bag dust removal equipment for filtration and adsorption. The filtered calcined petroleum coke powder adsorbed with waste gas is transported to the molding workshop through the auger conveying equipment, and is re-added as the formula of anode carbon blocks in the molding workshop to make raw anode carbon blocks. The gas filtered by the bag dust removal will be further processed by the desulfurization and denitrification equipment in the park, so as to realize the closed loop of the entire waste gas treatment process and achieve green emissions. Using the product (calcined petroleum coke) in the park as the adsorption medium, the waste gas treatment link in the production process is overcome, the waste gas treatment efficiency is improved, and the by-products in the waste gas can be put into production for reuse. The two-way reuse of the black adsorption production line and the molding workshop ingredients realizes a real technological breakthrough and saves production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Attached Figure 1 It is a production process flow chart of the present invention.

[0014] Numbers shown in the accompanying drawings: 1. Exhaust gas pipeline; 2. Flame arrester; 3. Reactor; 4. Clean powder bin; 5. Nitrogen generator; 6. Induced draft fan; 7. Pulse bag dust removal device; 8. Auger conveying assembly; 9. Forming bin; 10. Elevator; 11. Adsorption bin; 12. Feeding valve. DETAILED DESCRIPTION

[0015] The present invention will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms fall within the scope limited by the application equally.

[0016] The present invention is an environmentally friendly waste gas treatment device based on black adsorption, as shown in the accompanying drawings of the specification. Figure 1 As shown, the main structure includes an exhaust gas pipeline 1 connected to the roasting furnace, a flame arrester 2 connected to the exhaust gas pipeline 1, a reactor 3 connected to the flame arrester 2 through a pipeline, a clean powder adding component connected to the reactor 3 through a pipeline, a powder processing component connected to the reactor 3 through a pipeline, an adsorption component connected to the powder processing component through a pipeline, and a molding part connected to the adsorption component through a pipeline; The exhaust gas pipeline 1 is connected to the exhaust port of the roasting furnace. The exhaust gas pipeline 1 is a diagram in the specification. Figure 1The pipeline marked with the blue line in the middle, the exhaust gas generated by the roasting furnace is transported by the exhaust gas pipeline 1. From the perspective of fire safety, in order to prevent the flame from flowing back into the roasting furnace through the exhaust gas pipeline 1 after the explosion inside the reactor 3, a flame arrester 2 is installed between the exhaust gas pipeline 1 and the reactor 3, and two-way fire blocking is achieved through the flame arrester 2.

[0017] The clean powder adding component is connected to the forming bin 9 of the forming part through a pipeline. The clean powder adding component includes a clean powder bin 4 and an induced draft fan 6 connected to the forming part. The calcined petroleum coke powder in the forming bin 9 is transported to the clean powder bin 4 by the fan, and then the induced draft fan 6 transports the calcined petroleum coke powder in the clean powder bin 4 to the reactor 3. Since the black method adsorption requires the calcined petroleum coke powder to fully react with the exhaust gas before it can be completely absorbed, the internal space of the reactor 3 is large, and the pipeline at the connection between the clean powder bin 4 and the reactor 3 is A jet component is provided, and the jet component is a Venturi nozzle. The ejector is based on the Venturi effect. It changes the diameter of the pipeline and controls the pressure inside the pipeline, so as to increase the pressure and eject the calcined petroleum coke powder ejected by the ejector. The ejected calcined petroleum coke powder has a fast flow rate and is more dispersed in distribution, and is in more complete contact with the exhaust gas. After the calcined petroleum coke powder and the exhaust gas are fully mixed inside the reactor 3, the calcined petroleum coke powder (hereinafter referred to as the attached powder) that has adsorbed the exhaust gas needs to be filtered through the powder treatment component.

[0018] The powder processing assembly includes a plurality of pulse bag dust removal devices 7 and an auger conveying assembly 8 connected to the pulse bag dust removal devices 7; The multiple pulse bag dust collectors 7 are in two groups, each group is provided with 6 multiple pulse bag dust collectors 7, the air inlet pipeline of the pulse bag dust collector is connected to the reactor 3, and the air outlet pipeline of the pulse bag dust collector is connected to the exhaust gas treatment equipment; the loaded powder after the reaction in the reactor 3 flows into the multiple pulse bag dust collectors 7 through the air flow, and is filtered step by step by the pulse bag dust collectors 7, and the filtered gas is discharged from the air outlet pipeline to the desulfurization and denitrification equipment inside the factory, and is further treated and discharged after meeting the standards. The filtered attached powder is recycled, so an elevator 10 and an adsorption bin 11 connected to the elevator 10 are provided between the molding part and the adsorption component. The elevator is transported to the elevator 10 by the auger conveying component 8, and the attached powder is sent into the adsorption bin 11 through the elevator 10. The adsorption bin 11 is connected with a feeding valve 12, and the attached powder after adsorbing the exhaust gas is quantitatively added to the molding part through the feeding valve 12. The attached powder is directly recycled as an ingredient in the production of anode carbon blocks, and there is no need to perform secondary treatment on the attached powder, which will not affect the quality of the finished anode carbon blocks, and will also improve various indicators of the anode carbon blocks. Moreover, experiments have shown that since the asphalt flue gas is adsorbed in the attached powder, the asphalt raw materials used in the formula for producing anode carbon blocks will be further saved, thereby saving the production cost of the enterprise.

[0019] The molding section is a molding workshop in the anode carbon block production line. The finely crushed calcined petroleum coke powder is mixed with asphalt and vibrated and molded by a vibration molding machine. The molding section includes a plurality of molding bins 9. The molding bins 9 contain calcined petroleum coke powder. The calcined petroleum coke powder is used as the adsorption medium in the reactor 3. After being transported, it is fully mixed with the exhaust gas in the reactor 3. Compared with the carbon content of the metallurgical coke powder in the reference document, the carbon content of the calcined petroleum coke powder is very high, usually between 90% and 97%, and the carbon content of the metallurgical coke powder is about 70%. Therefore, compared with the adsorption medium in the reference document, the calcined petroleum coke powder has a higher carbon content and a better adsorption effect, so that the exhaust gas can be better adsorbed.

[0020] In order to further improve the adsorption effect of the calcined petroleum coke powder after mixing with the exhaust gas, it is necessary to control the particle size of the calcined petroleum coke powder. Therefore, the calcined petroleum coke powder transported to the clean powder bin 4 is an ultrafine powder with a particle size of 0.7-0.8 mm after being ground by a Raymond mill. After being ground into ultrafine powder, it is sprayed out by a Venturi nozzle and reacts with the exhaust gas in the reactor 3. The finer the calcined petroleum coke powder, the larger the reaction contact area and the better the adsorption effect. In order to avoid dust explosion of the calcined petroleum coke powder in the reactor 3, the exhaust gas environmental protection treatment device also includes an explosion-proof component, which is a nitrogen generator 5, as shown in the attached figure of the specification. Figure 1 As shown in the pipeline with green lines, the explosion-proof component is connected to the reactor 3 and the pulse bag dust removal equipment. The nitrogen generator 5 generates nitrogen as a protector and fills the reactor 3, thereby preventing dust explosion from occurring in the reactor 3.

[0021] S1, the calcined petroleum coke powder in the forming bin 9 is transported to the clean powder bin 4, and then transported to the reactor 3 by the pressurized jet of the clean powder bin 4, and mixed with the exhaust gas in the exhaust pipe 1; S2, after the calcined petroleum coke powder is fully mixed with the exhaust gas in the reactor 3, the exhaust gas and the calcined petroleum coke powder enter the pulse bag dust collector 7, and the pulse bag dust collector 7 separates the adsorbed gas from the calcined petroleum coke powder; S3, the adsorbed gas flows from the outlet pipe of the pulse bag dust collector to the exhaust gas treatment equipment, and is finally discharged into the atmosphere; the calcined petroleum coke powder adsorbed with waste gas is filtered out and transported to the inside of the adsorption bin 11 through the auger conveying assembly 8 and the elevator 10, and the calcined petroleum coke powder adsorbed with waste gas is quantitatively added to the forming part through the feeding valve 12.

[0022] In summary, this device replaces the traditional electric tar collector with black adsorption, solving the problems of low efficiency of electric tar collector and generation of micro-waste products. The calcined petroleum coke powder is sprayed into the pipeline at high speed through the ejector and fully mixed with the exhaust gas. After fully mixed, it enters the bag dust removal equipment for filtration and adsorption. The filtered calcined petroleum coke powder adsorbed with exhaust gas is transported to the molding workshop through the auger conveying equipment, and is re-added as the formula of anode carbon blocks in the molding workshop to make raw anode carbon blocks. The gas filtered by the bag dust removal will be further processed by the desulfurization and denitrification equipment in the park, thereby realizing a closed loop in the entire exhaust gas treatment process and achieving green emissions.

Claims

1. An environmentally friendly waste gas treatment device based on black adsorption, characterized in that: It comprises an exhaust gas pipeline (1) connected to the roasting furnace, a flame arrester (2) connected to the exhaust gas pipeline (1), a reactor (3) connected to the pipeline of the flame arrester (2), a clean powder adding component connected to the pipeline of the reactor (3), a powder processing component connected to the pipeline of the reactor (3), an adsorption component connected to the pipeline of the powder processing component, and a molding part connected to the pipeline of the adsorption component; The clean powder adding component is connected to the forming bin (9) of the forming part via a pipeline, and the clean powder adding component comprises a clean powder bin (4) connected to the forming part and an induced draft fan (6); the induced draft fan (6) transports the calcined petroleum coke powder in the clean powder bin (4) to the reactor (3); the clean powder bin (4) is connected to the reactor (3), and a jet component is provided in the pipeline at the connection between the two. The powder processing assembly comprises a plurality of pulse bag dust removal devices (7) and an auger conveying assembly (8) connected to the pulse bag dust removal devices (7); the air inlet pipeline of the pulse bag dust removal is connected to the reactor (3), and the air outlet pipeline of the pulse bag dust removal is connected to the exhaust gas treatment equipment; The molding section is a molding workshop of an anode carbon block production line, and the molding section comprises a plurality of molding bins (9). Calcined petroleum coke powder is contained inside the molding bins (9). The calcined petroleum coke powder serves as an adsorption medium in the reactor (3) and is fully mixed with the waste gas in the reactor (3) after being transported.

2. The exhaust gas environmental protection treatment device based on black adsorption according to claim 1 is characterized in that: An elevator (10) and an adsorption bin (11) connected to the elevator (10) are provided between the molding section and the adsorption assembly. The adsorption bin (11) is connected to a feed valve (12) for controlling the quantitative addition of the calcined petroleum coke powder adsorbed with waste gas to the molding section after adsorption of waste gas through the feed valve (12).

3. The waste gas environmental treatment device based on black adsorption according to claim 1 or 2 is characterized in that: It also includes an explosion-proof component, which is connected to the reactor (3) and the pulse bag dust removal equipment, and the explosion-proof component is a nitrogen generator (5).

4. The exhaust gas environmental treatment device based on black adsorption according to claim 1 is characterized in that: The particle size of the calcined petroleum coke powder is 0.7-0.8 mm.

5. The method for using the waste gas environmental treatment device based on black adsorption according to any one of claims 1 to 4, characterized in that: S1, the calcined petroleum coke powder in the forming bin (9) is transported to the powder cleaning bin (4), and then transported to the reactor (3) by the pressurized jet of the powder cleaning bin (4), to be mixed and contacted with the exhaust gas in the exhaust gas pipeline (1); S2, after the calcined petroleum coke powder is fully mixed with the waste gas in the reactor (3), the waste gas and the calcined petroleum coke powder enter the pulse bag dust removal device (7), and the pulse bag dust removal device (7) separates the adsorbed gas from the calcined petroleum coke powder; S3, the adsorbed gas flows from the outlet pipe of the pulse bag filter to the exhaust gas treatment equipment and is finally discharged into the atmosphere; the calcined petroleum coke powder adsorbed with the waste gas is filtered out and transported to the inside of the adsorption bin (11) through the auger conveying component (8) and the elevator (10), and the calcined petroleum coke powder adsorbed with the waste gas after the waste gas is adsorbed is quantitatively added to the forming part through the feed valve (12).

Images