Cement Plant Internship Report

Catalogue 1 Cement Plant Internship Report 2 Cement Plant Internship Report 3 Cement Plant Internship Report Part 1: Cement Plant Internship Report

I. Internship purpose 2. Internship requirements

3. Internship content and methods

3.1 Internship time Internship location Unit name 3.2 Company profile

3.3 Internship main process and internship content

1. Cement production process: raw material mining, raw material preparation, clinker calcination, cement production, cement shipment 2. Specific process

1). Raw material pre-homogenization: homogenization equipment + principle 2). Raw material preparation process: equipment + process flow, sandstone, iron powder, set by quality control according to a certain proportion, respectively, through each plate feeder, quantitative feeder It is fed into the grinding belt and is fed into the grinding machine by a rotary hopper. The grinding belt is equipped with a metal detector. When the metal detector detects that there is metal in the material, it jumps into the grinding belt. The material fed into the mill is dried and ground in the mill. The ground material is separated by the powder separator, and the coarse particles are re-grinded into the mill. The qualified fine powder is pretreated with the airflow inlet bellows and then enters the electricity collection. Dust collection, through the zipper, rigid impeller feeder, air chute, lifted by the bucket lift through the eight nozzle dispenser into the raw material homogenization library. The grinding slag is scraped out of the grinding chamber by the scraper, and the dispensing feeder is lifted through the vibrating feeder and the bucket lifting machine. When the grinding operation is performed, the dispensing valve is selected, and vice versa, the dispensing valve is selected into the buffer chamber. )

3). Clinker firing process: Rotating flow in the annular space between them, and moving downwards while rotating, from the cylinder to the cone, can extend to the end of the cone, and then turn Rotate up and up and exhaust by the exhaust pipe. } Rotary kiln calcination process:

The wet rotary kiln body is usually relatively long. In order to increase the heat transfer area of ​​the kiln, a chain is often attached at the end of the kiln to accelerate the evaporation of water. In the production of wet rotary kiln, water is added to the raw mill, and the raw material is made into a slurry containing 30% to 40% of water. After homogenization, the required slurry is sent to the kiln for calcination and ripening. The kiln clinker is cooled by a cooling machine and sent to the clinker storage. The raw coal is dried and pulverized into pulverized coal and then burned to supply the calories required for calcination. Equipment: Preheater rotary kiln decomposition furnace clinker cooling equipment: cement clinker cooling machine Working principle: The carbonate is further rapidly decomposed in the rotary kiln and a series of solid phase reactions occur to form a series of minerals in the cement clinker. As the temperature of the material rises, these minerals become liquid, and the dissolved in the liquid phase reacts to form a large amount. After the clinker is fired, the temperature begins to decrease. Finally, the high temperature clinker discharged from the rotary kiln is cooled by the cement clinker cooler to the temperature that can be withstood by the downstream conveying, storage and cement grinding, and the sensible heat of the high temperature clinker is recovered, and the thermal efficiency and clinker quality of the system are improved. )

4). Cement process: 5). Cement packaging and transportation:

3.4 Production Process 3.5 Product Features and Uses: IV. Analysis of problems in the production process and their solutions

The noise generated by the machine is too large, which is very detrimental to the health of the workers. The sound insulation of the machine should be strengthened. V. Internship questions

4.1 Characteristics of new dry process cement production?

A: The new dry-process cement production is based on suspension preheating and pre-decomposition technology, and the latest achievements in modern science and technology and industrial production are widely used in the whole process of cement production, so that cement production is efficient, high-quality, resource-saving and clean. Production, modern cement production methods that meet environmental protection requirements and large-scale, automated, and scientific management features. Features: 1 The whole process of raw material preparation is widely used in modern pre-homogenization technology. The mining and transportation of raw materials - raw material pre-homogenization - raw material grinding - raw material homogenization process, become a complete "homogenization chain" in the raw material preparation process. 2 The suspension preheating and pre-decomposition techniques are used to change the preheating and decomposition methods of the material accumulation state in the traditional rotary kiln. 3Using high-efficiency multi-functional extrusion grinding technology and new mechanical powder conveying device. 4 The large-scale process equipment has made the cement industry develop in an intensive direction. 5 “Provides favorable conditions for clean production and extensive use of waste residue, waste, recycled fuel and degradation of toxic and hazardous waste. 6 Production automation. 7 Widely adopted new heat-resistant, wear-resistant, heat-insulating and supporting refractory materials. 8 sets of IT technology , the implementation of modern scientific management.

4.2 What are the process characteristics of China Cement Factory Co., Ltd.? A: Guidance book: The main features of the production line.

Part 2: Cement Plant Internship Report

I. Internship purpose

The purpose of this production internship is to understand the production process, production equipment and production organization of the factory.

Through production internship, master the specific production process of cement materials, master the formation process of cement clinker, master the working principle and function of various production equipment, supplement knowledge for future work, recognize the society, and cultivate the ability of independent thinking and independent work. Gather the necessary materials and data for future graduation designs. After graduation, I can better adapt to work.

The location of this production internship is Zhihai Group Yuci Cement Branch. Yuci Cement Branch is a subsidiary of Zhihai Group. The company's products are suitable for the manufacture of concrete, reinforced concrete and prestressed reinforced concrete structures in the ground, underground and water, including structures that are subject to re-frozen. It can also be used to prepare high-grade concrete and high-strength engineering requirements; it is suitable for high temperature workshops and concrete structures with heat and fire resistance requirements, mass concrete engineering, steam curing concrete structures, and general engineering requirements for resistance to sulfate attack. Honor: AAA grade standard of Shanxi Province's quality and credit in 2006; “Top Ten Cement Products of National Cement” in 2006; “Outstanding Enterprise of Building Materials Industry in Shanxi Province” in 2007; “Shanxi Famous Brand Product” in 2008; National Building Materials Industry Technology in 2008 The second prize of the Innovation Awards Arts and Crafts. Second, the internship content 1, the supply workshop internship 1.1 broken

In the cement production process, most of the raw materials are broken, such as limestone, clay, iron ore and coal. Limestone is the raw material for producing the largest amount of cement. After mining, the particle size is larger and the hardness is higher. Therefore, the crushing of limestone plays an important role in the material crushing of cement plants. 1.2 Raw material pre-homogenization

Pre-homogenization technology is to use the scientific stacking and reclaiming technology to realize the initial homogenization of raw materials in the process of depositing and taking raw materials, so that the raw material storage yard has the functions of storage and homogenization.

1.3 raw material preparation

In the cement production process, at least 3 tons of material should be ground for every ton of tantalate cement produced. According to statistics, the power required for the grinding operation of the dry cement production line accounts for more than 60% of the power of the whole plant, of which raw material is ground. More than 30%, coal mills account for about 3%, cement grinding accounts for about 40%. Therefore, rational selection of grinding equipment and process, optimization of process parameters, correct operation, and control of operating systems are of great significance for ensuring product quality and reducing energy consumption. 1.4 Raw material homogenization

In the production process of new dry process cement, the stable raw material composition is the premise of stable clinker burning thermal system, and the raw material homogenization system plays a final role in stabilizing the raw material composition. 2. Burning workshop internship 2.1 Preheat decomposition

The preheating and partial decomposition of the raw material are completed by the preheater, instead of the partial function of the rotary kiln, the length of the return kiln is shortened, and the gas heat exchange process in the kiln is carried out in a stacked state, and moved to the preheater in a suspended state. Under the process, the raw material can be fully mixed with the hot gas discharged from the kiln, the contact area of ​​the gas material is increased, the heat transfer speed is fast, and the heat exchange efficiency is high, thereby improving the production efficiency of the kiln system and reducing the heat consumption of the clinker. purpose. Material dispersion

80% of the heat transfer takes place in the inlet pipe. The raw material fed into the preheater pipe, under the impact of the high-speed updraft, the material turns and moves with the airflow while being dispersed. Gas-solid separation

When the airflow carries the powder into the cyclone, it is forced to rotate in the annular space between the cyclone cylinder and the inner cylinder, and moves downward while rotating, from the cylinder to the cone. It can be extended to the end of the cone and then turned up and up, and discharged by the exhaust pipe. Precalcination

The emergence of pre-decomposition technology is a technological leap in the cement calcination process. It is an endothermic process of adding a decomposing furnace between the preheater and the rotary kiln and using the kiln tail ascending flue, and providing a fuel injection device to decompose the exothermic process of the fuel combustion and the carbonate decomposition of the raw material, in the decomposition furnace Rapidly in the suspended state or in the fluidized state, the decomposition rate of the raw material into the kiln is increased to over 90%. The carbonate decomposition task originally carried out in the rotary kiln is moved to the decomposition furnace; most of the fuel is added from the decomposition furnace, and a small part is added by the kiln head, which reduces the heat load of the calcination zone in the kiln and prolongs the lining The service life is conducive to the large-scale production; due to the uniform mixing of the fuel and the raw material, the fuel combustion heat is transferred to the material in time, and the combustion, heat exchange and carbonate decomposition processes are optimized. Therefore, it has a series of excellent performances and features such as high quality, high efficiency and low consumption. 2.2 Burning of cement clinker

After the raw material is preheated and pre-decomposed in the cyclone preheater, the next step is to enter the rotary kiln for clinker firing. In the rotary kiln, the carbonate is further rapidly decomposed and a series of solid phase reactions occur to form minerals such as dicalcium citrate in the cement clinker. As the temperature of the material rises, minerals such as dicalcium citrate become liquid phase, and dicalcium citrate and tricalcium aluminate dissolved in the liquid phase react to form a large amount. After the clinker is fired, the temperature begins to decrease. Finally, the high temperature clinker discharged from the rotary kiln is cooled by the cement clinker cooler to the temperature that can be withstood by the downstream conveying, storage and cement grinding, and the sensible heat of the high temperature clinker is recovered, and the thermal efficiency and clinker quality of the system are improved. 2.3 Cement grinding

Cement grinding is the last step in cement manufacturing and the most energy-intensive process. Its main function is to grind the cement clinker to a suitable particle size, form a certain particle gradation, increase its hydration area, accelerate the hydration speed, and meet the requirements of cement slurry condensation and hardening. 3. Internship in cement factory laboratory

The cement plant laboratory is divided into three major blocks, namely the physical group, the chemical group, and the fluorescence analysis group. 3.1 Physical Group

It mainly includes fineness detection, free calcium oxide content detection, cement standard consistency water consumption, setting time, stability measurement, cement specimen bending resistance and compressive strength testing. 3.2 Chemical Group

The chemical group includes the detection of components contained in cement raw materials, such as cl, Ca, Mg, Fe, Si, etc., and the detection of components contained in cement clinker and cement. 3.3 Fluorescence Analysis Group

It mainly measures whether the content of CaO, MgO, Al2O3, Fe2O3 and SiO2 in the cement is within the acceptable range. 4. Internship in the central control room

The central control room is the heart of the cement plant. China's cement industry has experienced manual experience operation, instrument monitoring-manual adjustment, until the development of computer automatic control, computer distributed control system has become the development trend of today's cement plant automation. Facts have proved that the automatic control of the whole process of cement production is not only important for improving product output and quality, saving energy, ensuring safe operation of equipment and prolonging service life, but also conducive to unified command and dispatch of production process. And management. It should be said that the automation of the whole process of cement production is one of the most significant features of the modernization of the cement industry. 5. Waste heat power generation internship 5.1 Technology development

China's cement kiln waste heat power generation technology has made great progress after nearly ten years of development, and is now close to the international advanced level.

5.2 Introduction to the waste heat power generation of the dry production technology kiln promoted by the state

Precalcining kiln and preheater kiln

In order to overcome the shortcomings of the medium-low temperature waste heat power generation system with the supplementary combustion boiler, the supplemental steam turbine unit is used to fully recover the waste heat of the exhaust gas below 200 °C, and the supplemental combustion boiler should use the low-quality coal or garbage such as coal gangue as fuel, save the economy. In addition to high-quality coal, it can also provide raw materials for cement production, reduce power generation costs, and further improve economic efficiency. At present, the personnel engaged in the technical work of the cement industry are committed to research on how to reduce the heat consumption of clinker and the power consumption of cement. The personnel engaged in the work of waste heat power generation are committed to how to improve the utilization rate of waste heat and improve the research on waste heat power generation. At present, there is no department that studies how to combine cement process technology with waste heat power generation technology to seek the lowest comprehensive energy consumption of cement and the best economic benefits. After analysis and research, the author believes that the best combination of cement technology and waste heat power generation technology should be: reduce the number of cement kiln preheater stages or change the preheater exhaust gas and material flow, so that the exhaust gas temperature of the preheater can reach 550 ° C ~ 650 ° C, so that the waste heat power generation system can cancel the supplemental combustion boiler, using the secondary heat recovery power generation system of the waste heat power generation kiln. This combination method, although the heat consumption of cement clinker has increased, but the power generation system can eliminate the supplemental combustion boiler without the problem of small capacity and low efficiency of the supplementary combustion boiler, while maintaining the production of high-pressure and high-temperature steam in the waste heat boiler to generate electricity. The system still has high operating efficiency. The waste heat recovery capacity of tonne clinker can be increased by more than 90 kWh. The comprehensive energy consumption of cement will be lower than the current precalciner kiln level, and the economic benefits will be significantly improved. Considering China's national conditions, this type of cement kiln and power generation system should be the main direction of the development of the cement industry with its lowest investment, lower comprehensive energy consumption and higher economic benefits. This is the cement industry needs to be serious. Major topics for research and discussion. The waste heat power generation kiln and the small preheater kiln fluidized decomposition furnace which have been put into production and the 1st to 2nd stage suspension preheater plus the waste heat power generation kiln secondary waste heat power generation technology are the waste heat power generation kiln and small scale that have been put into production in the future. The main mode of technical transformation of the preheater kiln. This comprehensive technology, in addition to cement clinker production can increase by 20% to 100%, per ton of cement \ clinker power generation capacity can reach 110 to 195 kWh, receiving triple increase in production, consumption, and economic benefits The effect, while the transformation of investment is also much lower than other models.

Third, the internship results

1. Internship receipt

After a half-month production internship, I have a deeper understanding of the knowledge in the book, which gave me a preliminary understanding of the cement production process, production equipment and production organization, and put us in the school. The knowledge of learning is completely connected, familiar with the specific production process of cement materials, mastering the formation process of cement raw materials, and mastering the working principle and function of various production equipment. At the same time, it is of great help to understand the society, cultivate the ability to think independently and work independently, train the spirit of hard work and hard work, and honing the strong will of the students. It enhances our labor concept and cultivates our skills in production practice. 2. Suggestions on school practice teaching

We are very satisfied with the internship teaching in the school. Let us learn the knowledge and connect the theoretical knowledge with the practice through the internship. During the internship, the teacher's follow-up teaching let us know a lot of practical production knowledge.

Fourth, internship summary and experience

Through production internships, students are engaged in production labor training related to the profession, learning production practice knowledge, enhancing students' labor concepts, and cultivating students' skills in production practice. In the production labor, production technology education and inquiring and reading on-site materials, students' theory is brought into practice, and the management process, technical indicators, production equipment and technical operation, product quality, production cost, labor productivity, etc. of the tantalate factory are deeply understood. Production and technical conditions. Identify existing problems and present your own insights; to develop and improve students' ability to analyze and solve problems independently. Learn about the factory's production organization system through special reports and on-site visits. Conduct safety education, understand the various production measures and rules and regulations of the factory, ensure the safety of the internship, obtain technical knowledge of production safety, and cultivate awareness of safe production. Write an internship report and conduct an internship assessment; enable students to be fully trained in writing engineering technical reports and conducting production practices.

Production internship is an important practical teaching link in the teaching of inorganic non-metallic materials. Its purpose is to enable students to acquire inorganic material production technology and management knowledge, to verify, consolidate and enrich the content of the professional courses that have been studied, and to cultivate students' theory and practice. Improve their ability to investigate and study, observe problems, analyze problems and solve problems in production practice, and lay the foundation for the follow-up of professional courses. Production internship is also an important way for students to work, enhance their labor perspective, understand the society, and learn to survive. Through production internship, students should cultivate the enthusiasm of professionalism and realize the concept of life value in society.

I am very grateful to the teachers and school leaders who gave us the opportunity to give us this internship. At the same time, I would also like to thank the leaders and technicians of the internship unit for their support and care.

Part 3: Cement Plant Internship Report

Dear company leaders:

On August 4, 2019, I was fortunate to be a member of Shaanxi Pubai Yufeng Cement Co., Ltd. Today, the one-year apprenticeship is full. I would like to thank the leaders of the company for their concern and trust. I am grateful to the company for providing me with the opportunity to train and learn in the first line, so that I can continue to grow and improve in my work and study. Looking back at the past year, this is the most important stage in my life, and I have learned a lot of things that I have not touched before. Here, thanks to the leaders of various workshops, it is your concern that I can know nothing about cement from the past, and now I have a comprehensive and in-depth understanding of cement technology and equipment maintenance, and further improve the technical management in the future. A good foundation has been laid.

The probationary period is a process of familiarizing with corporate culture, understanding the management of the enterprise, and learning the technical knowledge and learning to do things for others. During the year, my main job was to conduct internships in various workshops. According to the company arrangement, I went through the laboratory, the firing workshop, the raw material workshop, and the production workshop. As a trainee university student, first of all, you should feel the corporate culture, be familiar with the work process, adapt to the working atmosphere, and second, learn new knowledge, sum up work experience, and lay a good technical foundation. Below I will give a brief report to the leaders on the work of the past year.

First stop: laboratory

This is the first stop of my trainee. Due to my preference for chemistry and my interest in chemistry, I quickly entered the working state under the guidance of the laboratory leaders and colleagues. The laboratory mainly has four functional departments: control room, physical examination room, analysis room and process group. The main task of the control room is to complete the production control sample collection, inspection, chemical analysis and other related work according to the production process flow chart and the technical requirements of the raw materials, semi-finished products and finished products. The main control items are limestone particle size, raw material GaO and Fe2O3 analysis. Raw meal fineness, decomposition rate, clinker rise and f-GaO, cement SO3 and fineness, fineness of coal powder, etc. The physical examination room mainly measures the physical properties of clinker, cement and cement, including stability, setting time and compressive strength. The analysis room mainly conducts chemical analysis on raw materials, clinker, cement, and raw materials, and provides important data for calculating KH, P, and N to guide production. The main task of the technician is to analyze the data provided by the control room, the physical inspection room and the analysis room, and adjust the process parameters at any time according to the actual production to ensure the quality and output of the cement. The laboratory is the brain of the cement plant, controlling the entire production process while shouldering the mission of optimizing process parameters. In the laboratory, I learned the process and chemical physics analysis, and went to the site to actually understand. After more than two months of study, the entire cement production process has formed a system in the brain. Nowadays, the whole cement process is developing in the direction of environmental protection, low energy and high efficiency. This puts higher demands on each technician, and also encourages me to continuously learn new knowledge and new skills in future work.

Second stop: firing workshop

Through the internship in the laboratory, after the actual understanding of the site, I have a general understanding of the firing process. The internship in the firing workshop made me further understand the production process of the new dry process kiln decomposition production line. I often hear this in the kiln head: firing is the focus of the company, and the kiln head is the focus of firing. This is true, the quality of the cement and the size of the production depend to some extent on the operational skills of the kiln. But I think that the kiln head is the heart of the company, and the laboratory is the company's eyes better. Just arrived at the firing workshop, the director knows what I have learned, let me learn more about the craft, I also want to develop in this area, therefore, I often go to the scene to understand the specific production process of cement, do not understand when the humility Ask the teacher for advice. Sometimes I work with everyone, have an overhaul, and arranged for me to change the kiln tail seal windshield, to work until 9 o'clock in the evening, for two consecutive days, although very hard, but looking at my own results, I still feel Very fulfilling. During the three months of firing, I experienced the repair process of replacing the burner, sweeping the coal mill shaft, and replacing the kiln seal with the windshield. At the same time, I continued to learn new dry production after work and work. The process has a deep understanding of the operation of the kiln workers.

Third stop: raw material workshop

Raw material production is the second step in the cement process, where two vertical mills are the focus. After I quickly mastered the production process, I spent the main time in learning equipment maintenance. After the Spring Festival, the raw material workshop was overhauled. I was assigned to NE to upgrade this group to participate in overhaul. For two consecutive weeks, I was all gray, and I persisted and continued to mature. During the overhaul process, when I took a break, I went to another group to learn about the whole process of overhaul. I am fully aware of the importance of combining theory with practice. On the one hand, I often go to the site to understand the process and equipment, and at the same time consult relevant information, I hope that I can work very quickly. During the study of raw materials, I have experienced new and old grinding sticks, bearing replacement, fan bearing replacement, reducer bearing repair and replacement equipment, and have mastered certain work experience, and identified good work in the future work. Professional foundation.

Fourth stop: making workshop

The manufacturing process is the last step in cement production and the workshop that reduces the cost of cement. The cement mill differs from the raw mill in that the cement mill uses a ball mill. Here, there are two types of mills, one is an open-circuit mill, without a classifier, and the other is a closed-circuit mill.

In view of the obsolete equipment and the harsh production environment, the lubrication of the equipment is more important. In the equipment maintenance that I have experienced, most of the equipment is worn due to lack of oil, and the bearing is strained. Although I found that I can work hard and work hard, but because of the lack of work experience, there are still many places that need me to improve, and constantly strive to achieve better.

In short, the details determine success or failure, ability + knowledge + diligence + mentality = success. Have a sense of responsibility to the company, be caring for the society, have perseverance in the work, be enthusiastic about the colleagues, have confidence in yourself, and strive to be the best in the big family of the company! The above is my right This year's summary of the trainee work, please lead criticism and correct, I hope that I can grow up quickly and make greater contributions to the company!

Sincerely