1. The purpose and significance of internship

Through practice, on the basis of mastering professional theoretical knowledge, we can further understand some actual production processes in the chemical industry, have a more comprehensive understanding of the production and management methods of modern chemical production enterprises, and consolidate and deepen the professional knowledge we have learned. At the same time, using the professional knowledge of chemical engineering, I can independently analyze and solve some practical problems in chemical production and master the characteristics of chemical production and operation, so as to achieve the purpose of applying theoretical knowledge, integrating and enhancing my ability to adapt to practical work.

2. The development of Shida Technology Group:

Shandong Shida Technology Group Co., Ltd. is a school-run enterprise of China Youshi University (East China), a key university directly under the Ministry of Education. It is an important teaching, scientific research and production base, and an important part of the National Engineering Technology Research Center-the Oil and Gas Processing New Technology Engineering Technology Center of the Ministry of Education.

The company covers an area of about 1850 mu, with total assets of11000000 yuan, total fixed assets of 423 million yuan and employees of 16 10. 20 1 1 year, with sales of 4.208 billion yuan; It is a comprehensive ranking of key high-tech enterprises in the national torch plan, top 100 enterprises in the national petroleum and chemical industry, top 1000 enterprise groups, top 500 enterprise groups, top 100 industrial enterprises in Shandong province and university-run industries in China.

At present, the crude oil processing capacity of the group company is 6.5438+500,000 tons/year. It has 6,543.8+250,000 tons/year atmospheric and vacuum distillation-asphalt oxidation combined unit, 250,000 tons/year atmospheric and vacuum distillation, 200,000 tons of catalytic cracking, 60,000 tons/year dimethyl carbonate, 36,000 tons/year propylene carbonate, 654.38+0.00 tons/year methyl ethyl carbonate and 654.38+0.00 tons/year dimethyl carbonate. 3. Implementation requirements:

As an important part of teaching, production practice is an important teaching means to be familiar with and understand the actual chemical production process, contact with chemical production practice and master basic chemical production skills. Through the production work, field visit, teaching and discussion of the main positions in the internship factory, each student is required to be familiar with the production principles and technological processes of the main production processes in the factory, understand the performance and structure of the main equipment, understand the basis and detection methods of the operation indicators of the main technological links, apply the basic theoretical knowledge learned, and analyze and understand the main production technological routes and key operations and principles in combination with the reality, so as to lay a good foundation for further study of this major.

2. Practice content 1. Start and close of viscosity reducer:

In the process of construction, we should always stick to it? Safety first, prevention first and comprehensive treatment? Our thoughts are unshakable, demanding full preparation, safety and reliability, leaving no hidden dangers, persisting in opposing reckless risks and eager for success. During the construction process, there will be no oil leakage, oil crossing, overtemperature, overpressure, defective products, tower flushing, tower dissatisfaction, evacuation, fire and explosion.

Basic idea of starting construction: 1. The first time. 2. Cool the remaining oil. 3. Increase the temperature of the point sticking furnace. 4. Determine the liquid level. 5. send it out at the bottom. 6. Raise the temperature and pressure to normal.

2. Operating skills:

Basic operation skills include heat exchanger switching and pump switching. The operation of this position is mainly to adjust the viscosity by controlling the viscosity reduction pressure, and to stabilize the transportation capacity of catalytic mixed wax oil by adjusting the liquid level of asphalt tower.

Throwing of heat exchanger:

Put into use:

1. Confirm that the refrigerant bypass valve of the heat exchanger is open, slightly open the refrigerant outlet valve of the heat exchanger, slightly open the vent valve of the heat exchanger, confirm that the heat exchanger is full of medium, and close the vent valve;

2. Slowly open the cold medium outlet valve of the heat exchanger, slowly open the cold medium inlet valve of the heat exchanger and slowly close the cold medium bypass valve of the heat exchanger. Confirm that the heat medium bypass valve of the heat exchanger is open, slightly open the heat medium outlet valve of the heat exchanger, slightly open the vent valve of the heat exchanger, confirm that the heat exchanger is full of medium and close the vent valve;

3. Slowly open the outlet valve of the heat exchanger, slowly open the inlet valve of the heat exchanger and slowly close the bypass valve of the heat exchanger;

4. After the heat exchanger is put into use, confirm that there is no leakage in the heat exchanger, perform hot tightening as required, and check and adjust the temperature, pressure and flow rate of the inlet and outlet of the heat exchanger. Confirm that the heat exchanger is operating normally and restore heat preservation. Excision:

1. Open the inlet and outlet valves for cold medium of heat exchanger, open the inlet and outlet valves for hot medium of heat exchanger, block the blind plate area separating the vent valve of heat exchanger and the condensate drain valve, and isolate the blind plate of steam purging replacement pipeline of heat exchanger;

2. Open the heat medium bypass valve, close the heat medium inlet valve and close the heat medium outlet valve. Open the cold medium bypass valve, close the cold medium inlet valve and close the cold medium outlet valve.

Pump switching:

1. Make preparations before starting the pump, check whether the pressure gauge, fire cover and oil label of the pump are complete, whether the anchor screws, inlet and outlet valves and flange screws are tightened, turn the car by hand and idle for several times, check whether the turning direction is noisy, whether the lubricating oil tank and oil cup are fully lubricated, whether the cooling water is unblocked and whether the hot oil pump should be fully preheated;

2. Start the standby motor;

3. After the pressure reaches the rated lift, slowly open the outlet valve until it is fully open. Contact the operation room with walkie-talkie at the same time, and pay attention to the flow direction at any time;

4. When switching pumps, slowly close the outlet valve of the pump to be stopped until the flow of the running pump is large enough, and then close the outlet valve of the pump to be stopped;

5. Cut off the power supply of the pump motor to be stopped;

6. After the standby pump runs smoothly, check whether all parts of the pump are normal, and then slowly open the outlet valve of the pump. At this point, with the opening of the pump outlet valve, the pump outlet pressure will drop slightly, but the motor current will increase, so pay attention to the inspection;

7. Turn down the pump outlet pressure gauge valve;

8. After parking, the cooling water of the pump can't stop;

9. The hot oil pump should be preheated after stopping the pump.

Adjust the viscosity reducing pressure:

When the viscosity reduction pressure is low, open the auxiliary line valve of the water tank, turn down the oil and gas outlet valve of the water cooler, open the auxiliary line valve of oil and gas, turn down the auxiliary line valve of circulating water, or open the D 13 1 bottom coil to vaporize the oil into gas, and the pressure will increase. When the viscosity reducing pressure is high, the adjustment is opposite. Adjust the hot feed level:

When the hot feed level is high, open the valve at the inlet of P 1 16 on the wax oil supply collection pipe or the valve at the pump outlet of wax oil supply pipeline. When the hot feed level is low, the adjustment is opposite.

3. Accident handling:

Full tower processing:

After receiving the dispatch notice, it shall be treated as emergency shutdown, and the gas shall be vented for pressure relief. After the accident state is stable, the viscosity reduction system is put into operation normally; Purge the safety valve jumper pipe and equipment with steam to prevent condensation, and coordinate the vehicle to take the dirty oil in the visbreaking jump tank D 130 to the loading line for purging. After the safety valve is re-pressurized, it is installed and put into use, and its viscosity is reduced.

Tower flushing treatment:

Close the manual gas valve in front of the furnace, notify the dispatching and workshop, and send the visbreaking oil and pour point depressant at the bottom of the flash tower to check the liquid level.

4, safety training:

To enter the company, we must first carry out three-level safety education at the factory level, workshop level and team level, so as to firmly establish? Safety first? Realize. At the same time, there are ten bans on personal safety and ten bans on fire and explosion. Four don't let go? , three no injuries, three no hot work and other important safety regulations have been studied. 20 1 1, 12, 10 to 20 1 1, to carry out safety production throughout the company, by means of anti-violation, plugging loopholes and eliminating hidden dangers, and by means of fire prevention, explosion prevention, poisoning prevention and prevention. Activities. We're gonna keep going, okay? The greatest saving is safety, the greatest waste is accidents, the greatest hidden danger is carelessness, and the greatest contribution is conscientious? I thought, in my usual work? Take safety in production as your responsibility? Work in strict accordance with operating rules and labor discipline, avoid laziness and luck, and realize a safe and harmonious atmosphere throughout the company.

? Safety is not everything. But if you lose your sense of security, you lose everything? It can be seen that the important position of safety in our work cannot be ignored. The relationship between safety and production-they are not contradictory. Only under safe conditions can there be production: without safety, there will be no production. Neither production efficiency nor safety can be suppressed by production efficiency. Safety in production, not the center of gravity, affects the center of gravity: not Gankun, left and right Gankun. Each of our employees should establish? Safety in production, my responsibility? Concept, start from small things, start from now, start from yourself, and put safety into practical work.

5. Equipment and process:

800,000 tons/year atmospheric and vacuum distillation-oxidized asphalt-visbreaking combined unit was put into operation in July 2004. The designed annual processing capacity is 800,000 tons of Shengli crude oil, and DCS distributed operation control system is adopted. In addition to the conventional atmospheric and vacuum distillation products, this device can also produce 100 # A road asphalt, and at the same time, it can also produce visbreaking fuel oil with qualified kinematic viscosity.

The principle of visbreaking is that under the condition of high temperature and high pressure, the long carbon chain molecules are reduced to short carbon chain molecules after a certain period of delayed cracking reaction of vacuum residue, thus reducing the viscosity of oil products and producing fuel oil with qualified quality requirements. The visbreaking unit uses the principle of thermal cracking reaction to make the high temperature residue mainly undergo cracking and condensation reactions.

The post-treatment includes viscosity reduction treatment and hot feed treatment. In addition, it also includes public processes and fire control processes. The common processes in our factory include fresh water, circulating water, softened water, stripping steam, light dirty oil, purified air, non-purified air and 8kg steam. The fire fighting process includes the process of fire fighting water, fire fighting steam, fire fighting foam and fire fighting facilities such as fire monitors, foam guns and fire boxes.

Three. Practice results

After nearly two months of study, I have a comprehensive understanding of the public security fire control process of the device and a clear understanding of the technological process of this post. In terms of operation, the rejection and rejection of heat exchanger are studied theoretically. Able to operate the switch of the pump; Can independently adjust the viscosity reduction pressure and hot feed level of this position. In the study of accident handling, we only have theoretical knowledge and understanding, and we can't operate it well. This quarter's exam, I scored more than 70 points, indicating that I still have room for improvement. I will continue to work hard and make unremitting efforts to make myself a higher leap.

Four. internship summary

Summarizing the two-month internship, although some progress and achievements have been made, there are still some shortcomings, such as low enthusiasm and initiative. When you come to the company, you must rely on your own self-study to improve your skills, and the knowledge you have learned is your own. I often make some mistakes in my work, which is my dereliction of duty and a great lesson. Usually, we must anticipate possible accidents, be prepared for danger in times of peace, act cautiously, and work with a responsible attitude towards ourselves, others, the workshop and the company.

The new year has arrived. In this year, I will seriously study the rules and regulations, labor discipline and operation skills of the company and workshop, strive to make my ideological consciousness and work efficiency to a new level, make my own contribution to the development of the company and win glory for the school.

Self-evaluation of Chemical Engineering Practice Part III (1) Introduction to Practice

I feel very honored to have the opportunity to practice in the factory this time. Although it's only been a week, during this time, with the help and guidance of teachers and technical masters, I have a perceptual understanding of some common theoretical things and feel benefited a lot. This will be of great help to our future study and work. Thanks to the leaders and teachers of the college for giving us such an opportunity to learn, and also thanks to the teachers and workers for their careful guidance.

(2) Description of internship:

Our internship is mainly in the urea production plant in Xx. I practiced for half a day in five workshops including shift, decarbonization, carbonization, ammonia synthesis and urea synthesis. Under the detailed explanation and careful guidance of the workshop master, we have a detailed understanding of the equipment and control system in each section and a preliminary understanding of the process indicators in each section of the factory. ) the management system is also briefly understood. On the last day of internship, we also visited Xx Huaming Cellophane Co., Ltd., which develops, produces and sells chemical fiber, refined carbon disulfide, bleached cellophane, colored cellophane and its processed products, and operates the export business of self-produced products and technologies. Understand the production process and workshop of cellophane.

(3) Introduction, business philosophy and development history of the internship unit:

(1), Xx Fertilizer Plant of Xx Group is one of the first 13 small nitrogenous fertilizer plants with an annual output of 2000 tons of synthetic ammonia built in China in 1958. After the reform of 200 1, it was renamed as XxXx chemical co., ltd. in 2002, it cooperated with the provincial department of agriculture to realize asset reorganization, which laid a more solid foundation for enterprise development.

After more than 40 years' efforts, the company has been commended by the leaders of the former Ministry of Chemical Industry, Sichuan Province and Xx City for many times, and won the honor of the first batch of six good enterprises, spiritual civilization factory and national beautiful environment factory named by the former Ministry of Chemical Industry. Nong Yu brand ammonium bicarbonate and urea were rated as provincial quality products. Since 1998, the company has continuously carried out technical transformation and adopted four sets of advanced imported and domestic DCS computer control systems, so that the output and quality of products have been continuously improved and the cost has been continuously reduced. At present, the company has an annual output of 654.38 million tons of synthetic ammonia, 654.38 million tons of urea, 654.38 million tons of ammonium bicarbonate and 654.38 million tons of compound fertilizer. Under the guidance of the production and operation tenet of quality first and customer first, the products have won the praise of users and the favor of the market. In 200 1 year, it won the top 30 market share of chemical raw materials and chemical products manufacturing industrial enterprises in Sichuan Province. In 2002, the company's Nong Yu brand urea was listed as an inspection-free product by Sichuan Bureau of Quality and Technical Supervision, and was awarded as a model enterprise in Xx City in 2003.

Xx Company holds 1 subsidiary and 3 sub-factories, Xx Kechuang Fine Chemical Co., Ltd. produces fine chemical products such as water treatment agent and polyacrylate special rubber, and Xx Fertilizer Plant produces urea and ammonium bicarbonate; Compound fertilizer factory of XxXx Chemical Co., Ltd. produces compound fertilizer; Baoji Chuanlong Chemical Co., Ltd. produces ammonium bicarbonate, methanol and first-class methanol.

Xx company is an old chemical fertilizer plant with a history of more than 40 years, which is located in the post station on the ancient Shu commercial road. Eight droughts? Military location? Xx, a poetic name and a rich treasure house, is the industrial zone of Xx City, where many large and small state-owned enterprises are located. Until the beginning of this century, after various changes, only a handful of enterprises survived and had vitality. Among them, XxXx Chemical Co., Ltd. is not only a very dynamic enterprise, but also one of the big taxpayers in Xx District.

? Yushu stands in the wind, and the dragon jumps out of the water and soars into the sky. ? A couplet inscribed for XxXx Chemical Co., Ltd. by the famous calligrapher Xx, the deputy director of Xx Branch of XX Municipal Bureau of Technical Supervision, vividly illustrates that today's XX Company is like a towering tree, standing firmly on the earth regardless of wind and rain, like a dragon in the sky and breaking the surface, which means that the company has broad development prospects.

The predecessor of Xx Chemical Co., Ltd. was one of the first 13 small nitrogenous fertilizer plants built in China in 1958. Located in Dawan Town, Xx District, Xx City, Sichuan Province, it was later renamed as Xx Fertilizer Plant, which is very famous in China. However, due to backward equipment, chaotic management and institutional reasons, enterprises quickly fell into a trough after achieving certain results in a short period of time. At that time, there were more than 30 independent accounting departments in this enterprise, which caused serious capital dispersion and loss, and one of the branch factories was inexplicable (! ) 5 million was squandered without a trace; A small enterprise with an annual output of 25,000 tons of synthetic ammonia actually has more than 1.600 employees. As a result, enterprises are not only unable to move forward, but also heavily in debt. Xx Chemical Fertilizer Plant is on the verge of bankruptcy!