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Help CenterCarbon Plant Asphalt Flue Gas Black Method Adsorption, Black Method Adsorption, Industrial Asphalt Flue Gas Treatment Equipment, Oil-containing Flue Gas Treatment Equipment, Coke Oven Flue Gas Treatment Equipment
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Black method adsorption of asphalt fumesis a very ideal equipment for treating asphalt fumes in the carbon industry at present. It leads the calcined coke powder used in production to the newly built purification powder silo. One or more outlets are set at the discharge port of the purification powder silo according to the working conditions. Through the high-pressure centrifugal fan, the powder is respectively sent to the starting position of the fume collection branch pipes of the asphalt storage tank, mixing kettle and vibration molding machine with large fume generation. Purification starts from the source of fume generation, which can achieve better purification effect. At the same time, the starting section of the pipeline in the system is uniformly adsorbed by the grinding powder, which can effectively prevent the tar in the fume from adhering to the inner wall of the pipeline. The asphalt fume system after mixing with carbon powder becomes a simple dust collection system and enters the bag dust collector, and then re-enters the production process for batching through recycling. Thus, it can achieve the dual effects of fume adsorption purification and tar recovery.
Now let the editor of Cangzhou Jinding Environmental Protection Equipment Co., Ltd. introduce the working principle and process flow of the black method adsorption equipment for asphalt fumes in detail for you.
●Overview of asphalt fumes in the carbon industry
The carbon manufacturing industry usually uses petroleum coke as raw material and asphalt as binder through calcination. It is processed into various specifications of carbon products through processes such as raw material preparation, batching, mixing, molding and roasting. A large amount of productive dust overflows in each production process. Especially in the process of asphalt melting, mixing and molding in the molding workshop, a large amount of pollutants such as asphalt fumes, dust and water vapor will be generated. The composition of asphalt fumes is very complex, containing hundreds of substances. Among them, polycyclic aromatic hydrocarbons such as phenols, anthracene naphthalenes and benzopyrenes are harmful to humans, animals and plants. Especially3-4benzopyrene is a strong carcinogen, which has attracted more and more attention. In the mixing and molding processes of anode production, the overflow points of asphalt fumes are scattered. In the actual operation process, due to improper treatment methods, the asphalt fumes overflow, which endangers human health and causes environmental pollution, and has attracted great attention.
(1)Large specific surface area and porosity;
(2)Strong adsorption capacity;
(3)Good selectivity;
(4)Uniform particles, good mechanical strength, chemical stability and thermal stability;
(5) Simple production and low price; In the application of asphalt flue gas purification by kneading and molding, calcined coke powder is basically used as an adsorbent to adsorb tar in asphalt flue gas. After adsorption by coke, it enters the powder silo and participates in the batching. After the flue gas is purified by the bag filter, it returns to the atmosphere.
4,Application of black adsorption purification of asphalt flue gas in the molding workshop
Carbon forming production involves processes such as medium crushing, screening, asphalt melting, batching, kneading, forming, and green block cooling. The main work is to crush and screen the calcined coke and residual anodes produced in the calcination workshop to obtain particles of different grades, and then batch them with the melted liquid asphalt in a certain proportion. Under certain process conditions, kneading and forming are carried out to produce the required carbon products. Currently, many domestic carbon enterprises use the black adsorption method for asphalt flue gas, but the effect is not good, mainly reflected in the following problems:
(1)The problem of bag pasting in the dust collector bag;
(2)The problem of material blockage in the ash discharge screw conveyor of the dust collector;
(3) Blockage of the asphalt flue gas collection pipe, etc. The key to the purification efficiency lies in the adsorption efficiency. In terms of the adsorption mechanism, the adsorption of asphalt flue gas by coke powder is a mass exchange process between coke powder and asphalt fume. The coke powder and asphalt fume are in a flowing state, and the adsorption process is completed during the flow. In order to make the adsorption reach a saturated state, the amount of coke powder added must reach a certain solid-gas ratio.
Therefore, the new purification process of the black adsorption system for asphalt flue gas starts from a higher starting point and combines the ideal black purification technology for asphalt flue gas on the basis of fully integrating the production process. The advantages of this process technology are no waste material discharge and minimum product loss, and it will not cause secondary pollution problems. This black adsorption and purification system for asphalt flue gas fully mixes the powder produced by the grinding system with the heated and insulated asphalt flue gas in the reactor. The powder carrying the asphalt flue gas is collected by the bag dust collector and returned to the process as the raw material for the batching system. Its process flow: The asphalt flue gas discharged from the dust source points of the processes such as paste kneading, paste cooling, and forming is collected through pipes, and the temperature of the flue gas is regulated by heating before the asphalt flue gas is collected. After the regulated asphalt flue gas is centrally mixed, it flows through the vertically upward Venturi reactor along the designed route. Here, the Venturi provides the necessary mixing conditions. The flue gas is mixed with the coke powder ejected at high speed from the throat of the Venturi reactor, which is sufficient to make the asphalt flue gas adsorbed by the fine coke powder. The fine coke powder adsorbing the asphalt flue gas becomes the coke-carrying powder. The coke-carrying powder enters the pulse bag dust collector with the airflow, is collected by the bag dust collector, and enters the batching bin for later use.
5、Characteristics of the black adsorption and purification process for asphalt flue gas
Usea Venturi reactor to complete the adsorption process of dry materials on the flue gas.
Currently, the commonly used adsorption method is pipeline adsorption, that is, the coke powder enters the main pipeline containing asphalt flue gas, and the entire adsorption process takes place in the main pipeline. This method is simple; however, the adsorption efficiency is low, mainly because the gas-solid two-phase flow is uneven, and it is difficult to achieve the effect of full mixing of gas and solid. Therefore, to ensure the uniformity of the gas-solid two-phase flow, a reliable adsorption device must be found to ensure the adsorption efficiency. The flue gas adsorption device selected in this system is different from the traditional one. This method uses a Venturi reactor. The powder enters the VRI hollow cone, and through the holes arranged along the radiation line on the conical shell, it evenly flows into the flue gas pipeline in an overflow state and quickly covers the pipeline cross-section. The flue gas flows continuously, providing a uniform contact opportunity for the flue gas and the dry powder to complete the adsorption process of the dry materials on the flue gas. A heating device is used to heat the asphalt flue gas (suitable for severe cold areas).
To increase the air temperature after mixing in the entire system to a certain temperature or above, it is necessary to use an external heat source for heat exchange to supplement heat. Heating the collected flue gas before it enters the reactor can not only dry the moisture in the flue gas participating in the reaction but also raise the flue gas to a certain temperature, avoid water condensation, keep the flue gas temperature above the dew point, increase the temperature to fully mix the coke powder and the flue gas in the reactor and the pipeline, and improve the purification efficiency. Prevent the asphalt flue gas from solidifying and adhering to the pipeline wall. Thus, ensure the normal operation of the entire flue gas purification system.
The adsorbent silo realizes controllable discharging.
In terms of filter media selection, we choose high-quality, highly permeable, temperature-resistant, oil-repellent, and water-repellent membrane-coated filter media. We pre-treat the filter bags with coke powder carried by the flue gas to form a dust filter layer on the surface of the filter bags, which enhances the filtration of fine dust. Finally, the filtration efficiency of asphalt flue gas can reach over99.8%.
7.Asphalt flue gas emission indicators
After the environmental protection department tested the asphalt flue gas purification system, the purification effect was very ideal. The dust emission was below10mg/m3, and the purification efficiency was99.9%. The tar emission was below20mg/m3, reaching over97%. The purification efficiency of benzopyrene was92 - 95%. The technology adopted in this project far exceeds the national standards in terms of both dust and tar emissions. The environmental protection benefits are obvious.
8.Social benefit evaluation
Environmental protection benefits
In the forming workshop of the traditional carbon green anode manufacturing process, the pollution is the most serious, which not only affects the health of employees. The emitted asphalt flue gas also has an adverse impact on the surrounding environment, humans, and animals and plants. This project adopts advanced technology, and the emissions of both dust and tar are far below the national emission standards. The environmental protection benefits are obvious, and the working environment of employees is also effectively guaranteed.
Social benefits. Since this project adopts a large number of new processes and new equipment, it plays a positive role in promoting the cultivation of enterprise technical talents in the process of digesting, absorbing, improving and optimizing these new technologies.
Single-point feedingBlack method adsorptionProcess introduction
1Process introduction
The single-point feeding black method adsorption system collects the flue gas from each flue gas collection port and then converges it into the settling cylinder for settling. After the flue gas reacts and adsorbs with the adsorbent in the asphalt flue gas reactor, it enters the bag filter through the main flue for purification and then is discharged. The advantage of this scheme is that the reaction and adsorption mainly take place in the asphalt flue gas reactor, and its powder feeding pipeline is simple and easy to arrange. The main equipment of the single-point feeding black method adsorption process includes: metering system, variable frequency rotary feeding system, feeding pipe, feeding fan, asphalt flue gas reactor, settling cylinder, main flue, pulse bag filter, main fan, control system, and steam fire extinguishing system.
2Process flow
The process of the black method adsorption purification system is as follows: The main fan at the front end of the main flue gas pipeline (after the dust collector) is started, forming a certain wind speed and negative pressure in the flue gas pipeline, providing the flow and pressure to discharge the flue gas collected and purified from anode production into the atmosphere. At each flue gas generation point (The electric valves at the smoke collection points of the kneading pots are respectively interlocked with the kneading pots. When asphalt is added to the kneading pots and the paste is discharged from the pots, the valves are opened to collect the flue gas, and they are closed under normal circumstances, saving the air volume to a certain extent. Manual valves are used to adjust the pressure and air volume at each point.)The flue gas passes through the dust collection hood and the branch flue gas pipes and is collected into the main pipeline. Due to the effect of gravity and the sudden decrease in wind speed, the large - particle dust in the flue gas naturally settles in the settling tank and is discharged into the oil drum at the lower end. The small - particle dust rises with the high - temperature flue gas and enters the asphalt flue gas vortex reactor. At the same time, the adsorbent in the adsorption powder silo - extremely fine calcined petroleum coke powder is continuously transported to the asphalt flue gas reactor by the fan through the variable - frequency feeding device at the lower part of the powder silo. The asphalt flue gas and the fine calcined coke powder move in convection in the reactor, fully contact and mix, so that the adsorbent can fully adsorb the tar and toxic substances in the asphalt flue gas, achieving the purpose of removing tar molecules and purifying the flue gas. Then, the fine powder carrying the asphalt flue gas rises with the airflow induced by the main fan and reaches the bag filter. Through the filtration of the bag, the settlement in the ash hopper, and the discharge system, it is discharged from the bag filter and transported to the process batching silo (Ball mill powder silo) to participate in the process batching. The purified clean air without dust and tar is discharged into the atmosphere with the induced draft fan.
※ The characteristics and requirements of the asphalt flue gas black - method adsorption system are summarized as follows:
1) The exhaust gas is clean;
2) The petroleum coke powder containing tar and moisture is all returned to the process flow without causing secondary pollution and waste;
3) The dust collector uses differential pressure to control the ash - cleaning cycle to extend the service life of the bag;
4) The adsorbent comes from the process powder silo and is returned to the process batching without affecting the production process;
5) Reasonable layout and calculation of the pipe network, pipe diameter, etc. (fully considering the flue gas flow direction, equipment maintenance, process maintenance, flue gas flow velocity in the pipe network, etc.). Each smoking point is equipped with a manual regulating valve to adjust the flow rate and pressure. Each pipeline is provided with a pre - expected maintenance port, an observation port, and a sewage outlet. The flue gas pipeline from the dust collection point to the settling cylinder is all installed with steam or heat - conducting oil tracing and insulation, which can effectively prevent the flue gas from cooling too quickly and sticking to the pipe wall, and prevent the pipeline from being blocked during long - term operation.
6) Effectively reduce the number of maintenance and lower the labor intensity of workers;
7) The system is equipped with an automatic fire - extinguishing steam system, ensuring safe use.
Cangzhou Jinding Environmental Protection Equipment Co., Ltd. The company's main products includeBag filter,Electric tar precipitator,Asphalt fumeBlack method adsorption,Woodworking dust collector,Medium - frequency furnace dust collector,Boiler dust collector,Mine dust collector,Cement plant dust collector and other series of products, photo-oxidation catalytic purifier, low-temperature plasma air purifier, and spare parts for dust collectors (mainly includingDust filter bag,Dust filter cage,Electromagnetic pulse valve,Pulse controller, star-shaped discharger, screw conveyor, dust humidifier, etc.). Welcome new and old customers to call for consultation,Company website:
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