Practice writing practice summary is used to record your own practice process. This paper is a summary and feeling of coking plant practice, for reference only.
Fan Wen 1: Practice summary and feelings of coking plant; We will visit Nanjing Coking Plant for a week. It mainly includes three steps: pre-internship preparation, visiting internship stage and writing internship report. In the early stage, it is necessary to know the general situation of Zhengnan Coking Plant, prepare mineral processing and find out the route. We visited and practiced for two days. On the first day, we visited two sets of coking processes. The next day, we visited the chemical production process. Next, we look for information, arrange notes and write papers.
After we arrived at the factory, Minister Zhu of the Coking Plant introduced the general situation and safety knowledge of the factory to me. The technician introduced us to the tour process and called on us to work here after graduation. On the first day we visited the coking process. They have two sets of equipment and work at the same time. We ended our visit yesterday afternoon. From coal preparation to coking to finished products. Although the environment was a bit harsh, the students were curious and the master explained it in detail. The next day, we visited the chemical production process. We are all careful to avoid being clumsy, adding fertilizer, tar and cinder, and these dangerous working environments. After the visit, we thanked the masters and left. Back at school, we searched for information in the library, sorted out our notes, and finally edited the report. Through this internship in the South Coking Plant, we learned about the composition, production technology and main equipment of the coking plant. Know an important direction of your major, and establish perceptual knowledge about the verification of professional basic courses and the study of professional courses. At the same time, I found my lack of knowledge in many aspects in this internship, so as to make up for my lack in the process of learning professional knowledge in the future.
Thank you very much for arranging this internship. I feel much better than lectures, and I can better understand and master the process. Practice has tempered us, let us see the real chemical equipment, understand the actual working environment of the chemical industry, and at the same time find out the actual defects and deficiencies, which has aroused our enthusiasm for learning. This is a successful and meaningful practical activity. I hope the school can arrange it next time. Reflections on practice;
Companies looking for jobs now often ask us about our work experience. University internship is an excellent opportunity for us to accumulate work experience. Although this internship is a cognitive internship, I learned a lot from it. Although we don't know much about what the masters said, it is of great help to have a macro understanding of what we will learn in the future. Tell me more about my feelings.
Zhengnan Coking Plant is a large private coking plant with high utilization rate of chemical raw materials. Both coal raw materials and ammonia water are almost recycled. This makes me feel very happy. After all, it is a step towards green chemical industry. The equipment layout in the chemical plant is simple and reasonable, and the safety warning is obvious and convincing. The workers and masters in the factory are very skilled. I was deeply impressed by the way they skillfully operated the machine. I am very grateful to them for their patient explanation. At the same time, it also talks about the qualities that a professional chemist should have. Flexible mind, rigorous attitude, always pay attention to your personal safety. Coking plant has two sets of process equipment, which work at the same time, from which we can see that the plant pays attention to equipment renewal and is full of vitality. But even so, the harsh environment of the coking plant still makes me uneasy. On the first day, when we visited the coking process, the wind was particularly strong. In the coal preparation stage, pulverized coal flew everywhere, as if we had dug it out of a coal pit. So how much coal will be wasted year after year. When quenching, high-temperature water is sprayed and cooled, and how much heat is lost. These may not affect profits, but they are not green and harmonious to the environment and energy. It is hoped that future engineers will consider energy saving and efficient utilization when designing process flow.
In addition to the above professional knowledge, I am deeply proud of the wisdom of the working people. Such a large production equipment, such a large production tool and such a large production process are all created by our great working people! Maybe our present working technology is not excellent, maybe our working principle is not perfect, but as long as we work hard and study hard, we will have excellent technology and perfect principle. Therefore, as a new generation of future chemical workers, we can only learn our own professional knowledge, constantly improve and innovate, and strive for a green and harmonious chemical industry!
In college, we study theoretical knowledge and lack practical opportunities. Through this practice, I have learned a lot, broadened my horizons, and understood that the actual complexity is far from being simple in theory. So thank the school for organizing this internship opportunity, and hope to have the opportunity to exercise in the future.
Fan Wen 2:20xx Summary and feeling of coking plant practice on July 25th? On August 23, I came to Xiaoyi Hongta Coal Coke Co., Ltd. for production study and practice, and for the first time I linked theoretical knowledge with actual production. From this, I really realized the importance of the school experimental class, which is a sword for us to really get in touch with production and verify theoretical knowledge.
In the first week of factory practice, accompanied by the production technician Master Rou, I learned the process of preparing coal for the first time. The factory adopts the process of blending coal first and then crushing: raw coal? Coal unloading machinery? Conveyor belt, stacker and reclaimer? Different brands of coal are stored in coal storage plants? According to the production needs, the stacker reclaimer takes coal from the coal plant, transports it to the coal blending tank with a belt, and stores the coal separately? Mix all kinds of coking coals in a certain proportion according to production needs? Enter the crusher to crush and mix? Conveyed by belt to coal storage tower.
Then I visited the coking process. Master Rou gave me a detailed explanation and guidance from the structure and heating mode of coke oven. Have a deep understanding of gas equipment, waste gas equipment, exchange equipment, raw gas export equipment and furnace protection equipment, and make relevant notes. After that, I saw the coke oven machinery: coal charging car, coke pusher car, coke blocking car and coke quenching car. I watched the whole production process from coal loading to coke pushing and coke drying, and got a mental picture of the operation of each equipment, and recorded the relevant data in detail.
In the second week, Master Rou gave me some books and materials on mechanical coking and relevant operating procedures of various workshops. In the office, I read these books carefully, and further learned about some equipment I visited the previous week in theory. I also looked up a lot of relevant information on the internet, made a practical investigation on the information I didn't know, and exchanged and studied with many workshop workers. I have benefited a lot from this week's study and exchange of integrating theory with practice. Have a deep understanding of the whole production process and equipment of mechanical coking, and master many safety matters that need to be paid attention to during coking. After all, safety comes first!
In the third week, Master Rou took me to visit the purification of coke oven gas and the whole production process of coking chemical products. To tell the truth, it is really complicated to see many complicated pipes, but under the tireless explanation of Master Rou, I gradually got a clue. According to the color of the pipeline, the gray pipeline is filled with gas; The yellow tube is full of ammonia; The red pipe is filled with steam; The blue tube is nitrogen; It suddenly occurred to me that the significance of pipeline color distinction in our laboratory has such mysterious significance in real production. Color discrimination really makes some complicated pipelines simple and clear.
Then I learned the whole purification process of crude gas: crude gas? Riser? Bridge tube? Gas collector? Gas primary cooler for gas-liquid separator? Machine tar catcher? Electric tar catcher? Desulfurization tower? Series ammonia scrubber? Benzene scrubber? Benzene paint remover? Purifying gas; The decomposition of coal tar ammonia water is also known, mainly through the mechanized tar ammonia water clarification tank to separate ammonia water, tar and oil residue.
But also through the assembly line route to understand the whole production process. The gas entering the desulfurization tower, ammonia washing tower, benzene washing tower and benzene stripping tower enters from the bottom of the tower, countercurrent to the washing liquid at the top of the tower, and is discharged from the top of the tower. Of course, each process is interrelated, and a lot of washing liquid is recovered. I have made detailed notes on these processes, and many process plates have drawn many flow charts, and every detail is deeply understood.
In the fourth week, Master Rou gave me the information of coke oven chemical production in our factory. By comparing the data with the notes made last week, we know the principle and function of each equipment in each process section, as well as the principle and reaction process of chemical reflection in each tower, among which the primary cooler (horizontal tube primary cooler in the factory), electric tar catcher and mechanized tar ammonia tank have been further studied:
1, horizontal tube primary cooler
The gas passes through the primary cooler from top to bottom, the cooling water enters from the lower part of each section, and the low-temperature water is supplied to the lowest section, so as to improve the heat transfer temperature difference and reduce the gas outlet temperature; A spray device is arranged at the upper part of each shell side of the cooler to continuously spray ammonia water containing coal tar to clean coal tar and naphthalene deposited on the outer wall of the pipeline, and at the same time, a part of naphthalene can be absorbed from the coal gas. It is reasonable for gas and condensate to flow from top to bottom at the same time in a cross-section tube condenser. Because the naphthalene deposited on the tube wall is washed and dissolved by condensate, and ammonia water is sprayed on the upper part of the cooler and coal tar is sprayed from the middle part, the deposited naphthalene can be washed away better, thus effectively improving the heat transfer coefficient. In addition, it can prevent the condensed water from evaporating again.
2. Electric tar catcher
Its shell is cylindrical, the diameter of the settling tube is 250mm, and the length is 3500 mm The corona electrode wire is hung in the center of each settling tube and tensioned by the upper frame and the lower frame, and the eccentricity is not more than 3 mm The corona electrode with better strength can be used. 3.5-4 mm carbon steel wire or 2 mm nickel-chromium steel wire. Gas enters from the bottom and is evenly distributed to each deposition tube through two gas distribution plates. The purified gas escapes from the top gas outlet.
3. Mechanized tar ammonia clarifier: Its function is to separate tar and ammonia water and remove tar residue.
Mechanized tar ammonia clarifier is a container with rectangular cross section. It is divided into two parallel grids by the mediastinal plate, and the scraper conveyor runs slowly at the bottom, driven by the motor through the reducer and transmission chain. Tar, ammonia water and tar residue from the gas-liquid separator and the primary cooler enter the clarifier from the water inlet pipe through the receiver, and they are layered according to their respective specific gravity. The tar residue deposited at the bottom is transported to the upper part of the inclined bottom by the scraper conveyor and discharged through the funnel.
The linear speed of the scraper is: 1.74- 13.5m/h, too high speed will easily bring out tar and ammonia. Tar residue accounts for 0.2-0.4% of the total tar content. When anthracite is loaded, it can reach 1.5%, and dust below 2mm accounts for 72%, so it is very sticky. In order to prevent caking and sticking to the pot in winter, a steam pipe is installed around the funnel for indirect heat preservation. The clarified ammonia water is discharged through the overflow port, and the tar is pressed out from the lower part through the liquid level regulator.
This internship was deeply moved by the ingenuity of process design. In the future study, I will also seize every subtle place to study and study hard, so as to lay a solid foundation for stepping into social work in the future.
This practical study has benefited a lot! ! !
Finally, I am very grateful to * * * Coal Coke Co., Ltd. for giving me this opportunity to practice and study, and I am even more grateful to Master Rou * * who patiently guided me in my study! ! !
Fan Wen 3: Summary and feeling of internship in coking plant When the school bus drove into Masteel Coking Company, my first feeling was that it was so big here. This is the size of the factory I imagined. I have to say that the internship place is bigger than the last two, and it is much bigger. I can't help but imagine what it's like inside. Soon, the school bus stopped slowly and began our two-hour visit and study.
Before the visit, the relevant person in charge showed us the safety knowledge video, gave us safety education, and briefly introduced the relevant situation of Masteel Coking Company. Masteel Coal Coking Company has 8 coke ovens with an annual output of about 4,665,438+10,000 tons of coke. In recent years, the technologies of energy saving and emission reduction in coking industry, such as dry quenching, 7.63 m coke oven and vacuum potassium carbonate dehydration process, have been gradually applied in the company, which has promoted the realization of production efficiency, clean products and environmental friendliness.
Next, we arranged three teams to visit the production site, and under the leadership of the worker's master, we learned more about the coking process. Coking, also known as coking, refers to the process of converting coking coal into coke, coke oven gas and related chemical products through high-temperature dry distillation in a coking furnace. Coking coal is heated to about 1000℃ (high temperature dry distillation) under the condition of air isolation, and coke, coke oven gas and coking chemical products are produced by thermal decomposition coking.
Metallurgical coke has high carbon content, high porosity and high strength (especially high temperature strength). It is an important fuel and reducing agent for blast furnace ironmaking, and also a proppant and loosening agent for the whole blast furnace burden column. Coke oven gas is a by-product of coking with high calorific value. It is an excellent gas fuel for open hearth and heating furnace, and also an important energy component of iron and steel complex. Coking chemical products are important chemical raw materials. Therefore, coking production is an important link in modern iron and steel industry.
Next, the masters will give us a brief introduction to the related technologies of coking. Mainly divided into coal preparation, coal transportation, coking, coke quenching, coke quenching and coke screening. The preparation of coking coal is referred to as coal preparation, which is to prepare all kinds of clean coal (or low ash raw coal) from coal mines into coal materials with accurate proportion, suitable particle size, uniform quality and meeting the requirements of coking. Generally, it includes: coal unloading, coal storage and mixing, coal blending, crushing and mixing, and sending the prepared coal to the coke oven coal storage tower.
When refining high-quality coke, we must pay enough attention to coal preparation operation. Uniform coal blending, improve coal blending accuracy, minimize coal quality fluctuation, ensure the stability of coke chemical composition and physical and mechanical properties, and stabilize coke quality. Therefore, coal blending equipment must accurately blend coal according to the given value; Coal blending tank should be evenly and continuously filled with coal. Impurities in coal should be removed and the water content should not be too high. Reasonable coal crushing can effectively improve the mechanical strength of coke.
It is necessary to determine the most suitable crushing particle size for different coal materials according to the specific situation. Put the prepared coal from the coal tower into the coal loading car and send it to each carbonization chamber for charging. The gas generated by dry distillation is sent to the chemical product recovery workshop for treatment through the gas collection system. After a coking cycle (that is, the time from furnace charging to coke pushing is generally 14- 18 hours, depending on the width of the carbonization chamber), the refined coke is pushed into the quenching car by the coke pusher through the coke stopper; After quenching, the coke is discharged into the coke cooling table; And then sieving and storing.
The last coke quenching became the focus of our visit. Coking Company of Maanshan Iron and Steel Co., Ltd. uses dry quenching to quench coke. CDQ is an energy-saving technology widely used abroad at present. Under the guidance of the master, everyone watched it there for a long time and got a preliminary understanding of it. The general process is that the coke truck full of red coke is dragged to the bottom of the lifting derrick by the electric locomotive. The hoist lifts the coke tank to the top of the dry quenching furnace, and the coke is loaded into the dry quenching furnace through a charging device with a distributor.
In the dry quenching furnace, the coke directly exchanges heat with inert gas, the coke is cooled to below 200℃, discharged to the belt conveyor through the coke discharge device, and then sent to the coke treatment system. The circulating fan blows inert gas for cooling coke into the dry quenching furnace from the gas supply device at the bottom of the dry quenching furnace, and exchanges heat with red hot coke in countercurrent. The temperature of hot circulating gas discharged from CDQ furnace is very high, and it enters CDQ waste heat boiler for heat exchange after primary dust removal, and the temperature drops to 250 ~ 270℃.
The cold circulating gas from the boiler is dedusted by the secondary dust collector, pressurized by the circulating fan, cooled to about 130℃ by the boiler feed water preheater, and then recycled in the dry quenching furnace. The steam generated by CDQ boiler is either incorporated into the steam pipe network of the factory or used to generate electricity. Compared with wet quenching, dry quenching obviously saves energy, and at the same time, the quality of coke obtained is obviously improved.
In Masteel Coking Company, we learned about the related coking technology. More importantly, the improvement of production technology not only improves the production capacity and quality, but also saves a lot of costs. We have studied energy conservation in the major of thermal energy and power engineering. I believe that if we learn more professional knowledge, we will definitely have a deeper understanding of it.
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