Abstract: With the continuous development of the construction industry, the scale of cement production is also expanding, but the dust emitted during the cement production process will cause serious pollution to the atmosphere and the environment. In the process design of cement plants, it is necessary to use enhanced industrial dust removal technology. Even though the current dust removal technology of cement plants in my country has been researched, there are still some shortcomings. This article will analyze the application of storage technology in the supply design of cement plants.
The research on dust removal technology in the process design of cement plants has very complicated characteristics because it covers many aspects. The level of science and technology continues to rise, and nowadays the dust removal technology of cement plants is also enhanced, but there are often certain limitations. Therefore, it is of great significance to analyze and research the dust removal technology of cement plants, and relevant researchers must fundamentally study and solve the dust problem of cement plants. Then we must first analyze the source and characteristics of cement dust so that we can prescribe the right medicine to find a targeted solution.
1. Overview of dust removal technology in process design of cement plant
Because cement plants must process and treat raw materials in all stages of production, it is inevitable that dust will be generated in this process. At present, in many cement plants, the dusting equipment in the production process is unorganized non-point source emission from the ventilation and dust removal system; after the equipment ventilation and dust removal fails, the dust discharged by accidents will result. The main task of the grinding system in a cement plant is to grind raw meal and cement. If the flow rate of the airflow is not consistent with the output and ventilation of the powder, a large amount of dust will also be generated.
On the other hand, the manual grinding system may cause operational errors, the conveying device has a weak sealing degree, and a large amount of dust will also be generated. During the drying process of the cement plant, the barrel keeps running continuously, so the slag that is bumped up, the fine particles contained in its rise. In the process of making cement in cement plants, crushers must be used, but a large amount of dust will also appear in the process of crushing raw materials. The feeding, crushing, and final discharging of materials will produce a large number of fine particles in all steps. And coupled with the effect of airflow, the dust spreads in a large area, causing pollution. But what we need to pay attention to is that if the material processing in the crushing process is not perfect, it will further expand the dust emission. In the packaging process of cement plants, dust will also be generated due to various factors such as the human operation of equipment. The design principle in the process design of the cement plant is that the filter with plant fiber is used to separate the solid particles in the air. At present, there are mainly membrane filtration, dust filtration, etc. The specific filtration methods include sieving and gravity sedimentation. At present, the application of filter material filtration technology at home and abroad has been changed. Compared with the past, it has enhanced a higher collection rate, which can block dust on the surface of the green material, so it is easier to process glass. The bag filter produced in my country has achieved nearly 100% dust removal effect.
2. Design principles and related technical application requirements of cement plant dust removal technology
2.1 Design principles of dust removal technology in cement plants
First of all, in the process of designing the dust removal technology, it is necessary to maintain the accuracy and reliability of the basic data, and the overall layout must have strong rationality. Secondly, in order to better avoid secondary pollution, energy consumption must be reduced. The third point is to ensure that the processing technology used by itself is reasonable and scientific, and the processing capacity must meet the processing requirements. Reduce the cost of investment and energy consumption, promote the entire process of operation and management, while being simplified, it can also promote the increase of the safety factor. The equipment and materials used in the cement plant must have a certain degree of corrosion resistance so that the service life of the equipment can be extended. In the process of the exhaust gas treatment system, we must first pay attention to safety accidents, and also consider the use of equipment for corresponding protective measures. Finally, in the process of equipment installation and engineering settings, it is necessary to ensure that the relevant steps are in line with the requirements of my country's professional technology.
2.2 Application requirements for process design and storage requirements of cement plants
(1) Selection of high-efficiency dust collector
Choosing this high-efficiency dust collector in the process design of cement plants can better promote the reduction of dust emission rate concentration. In addition, the relevant technical staff should also pay attention to the technical content of the equipment, increase research efforts, and find better ways to control dust emissions. And in the process of selecting storage technology, it is necessary to choose to use the first-level system to simplify the system process while reducing the resistance of the system, thereby helping the system to operate stably.
(2) Select the dust collector according to the process equipment
Because all the links in the production process of cement plants are different and have different characteristics, we also need to select process equipment according to these different production steps. Because the cause and nature of the dust generated by different supply equipment in the operation process are also different, we should also pay attention to a certain degree of pertinence when choosing the storage period. According to the actual characteristics of the process equipment to choose the dust collector that meets its requirements, so that while controlling the production cost, it can also promote the increase of equipment maintenance efficiency.
(3) Focus on prevention and treatment
During the production process, the cement plant must strengthen the sealing of the process equipment and thoroughly solve the air leakage problem in the ventilation system. In this way, dust emissions can be reduced from the source.
(4) Reinforce the transformation of the old dust collector
Because some cement plants are located in special geographical locations, they may not be convenient in terms of economy and transportation, and this will also hinder the upgrading of cement plants. Then those related equipment managers must improve some older storage devices, or eliminate them.
2.3 Analysis of the design of dust removal technology in cement plants-with bag filter as a reference
First of all, in terms of technology, the bag filter is highly adaptable, but also has the characteristics of lower energy consumption. The use of this type of dust collector in current cement plants has been very popular. We can divide dust removal technology into two types: dust removal technology and filter material technology. These two technologies use rapping dust removal methods and reverse air blowing methods. Then when designing and selecting the belt dust collector, it should be decided according to the actual use situation, and the choice of filter bag material should be considered.
Secondly, in terms of fabric selection, the bag material usually uses needle-punched felt fabrics with strong oxidation resistance and temperature resistance. For example, the dragon frame needs to use 16 vertical bars, and the selected NOMEX fiber temperature must be maintained at 200 degrees upwards, and at the same time, it must have the ability to resist acid and alkali gases.
In the process of selecting the fabric of the kiln tail, the cost-effective glass fiber PTFE is usually used to cover the fabric, and the number of ribs in the longitudinal direction cannot be less than 24, which must be removed during the sewing process. Use the TEFLON line.
The cloth for cement mill usually chooses polyester needle felt PTFE coated filter material. By using this cloth, it can better ensure that the equipment is in operation to reduce the running resistance, thereby enhancing the stability coefficient of the equipment operation.
When choosing fabrics for coal mills, we must choose fiber polyester needle-punched felt fabrics with strong antistatic properties, which can reduce the probability of unstable phenomena during the kiln firing process.
2.4 Dust removal application of mill
Through the use of the lifting cycle machine and the exhaust function of the mill flow, the mill ventilation can be achieved. In this case, exhaust gas in the range of 150g/Nm3 will be generated, and the temperature is generally lower than 100 degrees Celsius, but also contains more Moisture. It is impossible to treat the exhaust gas from ordinary dust collectors, thereby reducing the dust removal effect of the dust collector. At present, there are many cement manufacturers, and most of them choose to use new dust removal and dust removal equipment that integrates dust removal technology control technology and filtration technology, and this equipment has a higher dust removal effect.
2.5 Treatment method of dryer flue gas
Under normal circumstances, the flue gas emitted from the dryer has a higher concentration, temperature, and humidity compared with ordinary hoods. It is difficult for ordinary cyclone dust collectors to truly treat these flue gases, so then, The problem of corrosion will occur. In response to this situation, the cement plant usually adopts anti-condensation wave fiber belt dust removal technology during the drying process. Through the application of this technology, the dust content can be better controlled within a reasonable range, it effectively promotes the increase of the overall effect of the cement plant.
All in all, with the continuous update of modern process equipment and ventilation devices, this has promoted the increase in cement production and also reduced the maintenance cost of cement plants. The author hopes that there will be more professional people who can invest in the storage technology research of cement plants, and put forward the shortcomings of this article. Promote the real control of the dust in the cement plant, promote the more stable operation of the cement plant equipment, extend the service life of the equipment, and better build a cement plant with a high-quality working environment.
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