Summary of desulfurization work 1 First of all, I am very grateful to the factory leaders for sending me out to participate in this training. It can be said that I benefited a lot from participating in this environmental protection training, which gave me a further understanding of environmental protection. The measures of environmental protection have also been further studied theoretically. In the past, I only had a little intuitive and perceptual knowledge about boiler flue gas desulfurization. After this training, it's different now. After this intensive study, I have learned a lot about desulfurization methods. The treatment of boiler flue gas in our factory is only a simple treatment of so2 in flue gas. The treatment method is simple, the efficiency is limited, and the utilization rate of calcium powder is low. If we want to comprehensively control our boiler flue gas and carry out desulfurization and denitrification, we still need to make great efforts, which is the shortcoming of all our power plants.
/kloc-In May of 0/4, I was assigned to Jinji Hotel in Taiyuan to participate in the 40th qualification training of environmental protection equipment for enterprises in Shanxi Province. The accommodation environment of Jinji is average, but the training classroom and dining place are not bad. In eight days, Taiyuan invited professional training teachers from the Provincial Environmental Protection Department and Shanxi University to focus on the knowledge of pollutants such as flue gas, dust and sewage post-treatment. Understand the generation of boiler flue gas in power plant and the treatment methods of pollutants with harmful components to the environment; Master the theory and method of boiler flue gas treatment. In the later training, we focused on learning a lot of advanced theoretical knowledge of desulfurization and out-of-stock, and also had a certain understanding of the by-products of desulfurization and denitrification. The following is my summary of desulfurization technology in China after this study.
Desulfurization refers to fixing sulfur in coal into solid by calcium-based method to prevent so2 from being generated during combustion. Generally speaking, desulfurization methods can be divided into three categories: desulfurization before combustion, desulfurization during combustion and desulfurization after combustion.
Desulfurization after combustion, also known as flue gas desulfurization (FGD), is better than calcium-based desulfurization in our combustion. In flue gas desulfurization technology, according to the types of desulfurizers, it can be divided into the following five methods: calcium method based on CaCO3, magnesium method based on MgO, sodium method based on Na2SO3, ammonia method based on NH3 and organic alkali method based on organic alkali. The commercial technology widely used in the world is calcium method, accounting for more than 90%. According to the wet and dry conditions of absorbent and desulfurization products during desulfurization, desulfurization technologies can be divided into wet, dry and semi-dry methods. Wet flue gas desulfurization technology is to use absorbent solution or slurry to desulfurize and treat desulfurization products in wet state. This method has the advantages of fast desulfurization reaction, simple equipment and high desulfurization efficiency, but there are many problems such as serious corrosion, high operation and maintenance cost and easy to cause secondary pollution. Desulfurization absorption and product treatment of dry flue gas desulfurization technology are carried out in dry state. This method has the advantages of no waste water, no acid discharge, little equipment corrosion, no obvious cooling of flue gas during purification, high temperature of flue gas after purification, good tail gas diffusion and less secondary pollution, but there are some problems such as low desulfurization efficiency, slow reaction speed and huge equipment. Semi-dry flue gas desulfurization technology refers to dry desulfurization and wet regeneration, or wet and dry desulfurization
Flue gas desulfurization technology for treating desulfurization products under different conditions. Especially, the semi-dry method of wet desulfurization and dry treatment of desulfurization products has attracted wide attention because of its advantages of fast reaction speed and high desulfurization efficiency, as well as the advantages of dry method of no waste acid discharge from sewage and easy treatment of desulfurization products. According to the use of desulfurization products, it can be divided into two methods: discard method and recovery method.
Desulfurization Work Summary 2 In order to implement this month's working ticket activity and make this activity effective, the team leader and Commissioner often go deep into the grassroots and the site to conduct on-site inspections to ensure the normal development of the activity. In the work ticket month activities, each team timely guides and urges, and earnestly implements the work ticket system. Through the planned, organized and purposeful analysis of this responsibility accident, the problems on the work ticket are finally found out. The activities of "Working Ticket Month" are summarized as follows:
First, strengthen the working ticket process, improve the understanding of mis process and strengthen management.
1. According to the operation process of working ticket, all working leaders are trained in the operation process of producing mis system working ticket, operation ticket and equipment defect treatment every Sunday night. How to correctly fill in the work ticket and the dangerous points and pre-control measures in the work to deal with the equipment defects of new employees, and ensure that every employee has a process of handling tickets for mis. For the actual operation of each employee, some new employees are not clear about the correct specification of filling in the work ticket, and the person in charge of the work will only lead the employees to work without knowing the state of the work ticket processing process, which effectively improves the actual working ability and business level of the person in charge of the work.
2. Before the team leader and technician start work every day, the working director must explain the work tasks to all members of the working class, explain the isolation measures, do a good job in hazard analysis and pre-control, and formulate detailed hazard analysis and corresponding preventive measures. Only then can the members of the working group sign the letter of guarantee, emphasizing that they can't work without tickets, can't work with tickets, strictly supervise the signing of working tickets, strengthen the implementation of work cards and work tickets audit management, and standardize working procedures. Make the disclosure of each work be implemented before the start of construction, and the safety officer of the professional team will check the supervision of each work. If there is any illegal operation in the working ticket, the working director will inform and correct it in time. If the circumstances are serious, the monitor technician and the person in charge of the work will assess together to lay the foundation for safe production.
Second, strengthen the supervision and management of work tickets and analyze the importance of safety.
1, so that every employee can always realize that the work ticket is the first life guarantee in the work and realize the importance of the work ticket, and a work director carries multiple work tickets at the same time; Put an end to non-staff responsible for collecting working tickets. If the person in charge of the work is not on the scene on vacation, replace the person in charge of the work in time. The person in charge of the work must make safety technical disclosure to the members of the working class, explain the dangerous points and pre-control measures in this work, and all members of the working class can understand and sign the safety guarantee or safety technical disclosure before starting work.
2. Working ticket and operation ticket are the operation credentials of the operator. It must be audited by the drawer, guardian and other personnel to check whether the safety measures and pre-control of dangerous points are correct and complete before operation. In order to ensure personal and equipment safety, the working ticket requires the operator to take isolation safety measures.
The "two votes and three systems" in power plants were exchanged by the predecessors of power production with blood and life, and were written with the lessons of accidents. In practice, we should conscientiously study and implement various rules and regulations, standardize and abide by the "two votes and three systems", improve the ability to prevent accidents, nip misoperation, abnormal equipment and accidents in the bud, change the erroneous thinking that accidents are inevitable in the past production process, prevent accidents, and fill in working tickets correctly.
Third, weekly working ticket analysis meeting
In the daily maintenance work, problems of one kind or another often occur during the execution of thermal machinery work tickets, which may easily lead to personal injury and equipment damage. Therefore, it is necessary to summarize and analyze the causes of these common problems in time, and take preventive and corrective measures to ensure the safety of personal equipment during maintenance. It is also necessary to strengthen the management of work tickets, the implementation of work tickets by each team member within one week, and some problems and suggestions on work ticket management. The safety officer in the team will report the problems found in the quality of the working tickets of each team within one week. Summarize all the problems and discuss and analyze them one by one according to the actual situation, and formulate feasible on-site dangerous point analysis and pre-control measures for some management loopholes and new problems. At the same time, each team will set the work priorities for next week, study and solve the difficulties and problems in the work, make the work ready in advance, put an end to passive coping and blind recklessness in the work, and make employees realize the importance of working tickets in the work, thus ensuring the safety of on-site work.
Summary of Desulfurization Work 3 Time flies, and 20xx years will soon pass. At this time, in order to better do all the work, learn from each other's strengths and give full play to our advantages, we summarized the work of the past year. Under the correct guidance of the branch leaders, the desulfurization work has achieved fruitful results in the past year. At the same time, there are many shortcomings. Over the past year, we have mainly done the following work:
First of all, in terms of safety production, we take "current management, behavior control and continuous improvement" as the guiding ideology, and closely focus on "life first, safety first" as the action guide to implement all the work. At the beginning of the year, under the premise of the rules and regulations of the branch factory, we formulated more specific management regulations according to the actual situation. Adhere to safety before class, check safety during class and summarize safety after class. Let every employee always remember safety first. The team members carefully studied the spirit of various safety instructions and promptly rectified the safety hazards found on the spot. Leave no hidden dangers. Especially in the overhaul in April this year, we organized well, paid attention to safety, and always reminded everyone not to forget safety. Because we always put safety first, the safety alarm kept ringing, so there was no accident due to poor management during the maintenance. However, where safety management is neglected in normal production, various safety management systems should be improved in future work to make safety management go up a storey still higher. In the implementation of process discipline, I can seriously implement the process discipline of the company and the branch factory, and basically complete the tasks assigned by my superiors. At the same time, we also have many shortcomings: for example, after the transformation of electrostatic precipitator, we did not pay attention to the implementation of indicators in the operation process, and our sense of responsibility was not strong enough, and we did not strictly follow the patrol inspection system, which led to the temperature of electrostatic precipitator not reaching the standard, which led to the repeated bursting of porcelain bottles, which affected production and caused great losses to the company and the branch factory. We will certainly learn a lesson, strictly implement the technical indicators in our future work, and try our best to make all the work foolproof and contribute to the flight.
Labor discipline of civilized production: to ensure safe, stable and high-standard production, reduce unnecessary losses, strengthen management, put the responsibility on people, put an end to leakage, save energy and reduce consumption, and maintain equipment to achieve long-term operation. Seriously convey and implement the spirit of the company's documents, so that every employee can be civilized and polite. In view of the violation of labor discipline at work, we adopt the concept of "people-oriented" and take the Labor Discipline Regulations as the criterion to achieve equality before discipline. The team leader who asks employees to do it must first do it, and the team leader should take the lead in setting an example for employees. Starting from 1 month, we organized employees to seriously study "white team management" and carry out various tasks under the guiding ideology of "six threes". Improve the management level of each monitor. We take the "Management Regulations" as the criterion to deal with individual employees who violate discipline. Due to our strict management, there was no serious violation of discipline throughout the year.
In terms of learning, we can seriously organize each team to learn the superior documents by changing shifts, and establish and improve the team management system. Members of the class committee are elected through democratic appraisal, giving full play to the leading role of each class committee. During the overhaul in April, under the leadership of the squad leader, we were able to finish the work of dismantling the tower, installing the tower and cleaning the tank ahead of schedule, which laid a solid foundation for driving ahead of schedule.
Hold a meeting of team leaders once a month, give full play to democratic centralism, democratize and institutionalize team management, and fully embody the people-oriented management system. In the past year, there were achievements and mistakes. In order to do better in the future, we should sum up the past and look forward to the future. In the future work, we should redouble our efforts, strictly manage, conscientiously complete the tasks assigned by superior leaders, and give full play to the intelligence of the team leader. Make due contributions to the work of the branch factory.
Desulfurization
20xx. 12
Summary of Desulfurization Work Article 4 Desulfurization Major has formulated the professional work objectives at the beginning of 20xx, focusing on dust leakage control of electrostatic precipitator and ash conveying pipeline, stable operation of desulfurization equipment and civilized production on site.
According to the existing personnel situation, it is difficult for us to complete the work goal. With the support of relevant leaders, two backbones were transferred from steam turbine specialty to enrich the dust removal class. After the dust removal class is enriched, the management of the team has been improved and the appearance of the team members has changed. There were more than 20 equipment defects in the first week of the year, and now the number is no more than 10, which greatly improves the reliability of the equipment.
The key point of equipment defect management is to grasp the quality of defect elimination, organize key personnel to study the post-level law of multiple defects, and make a defect elimination plan. It is listed as follows: the discharge valve is worn after three months, and the balance pipe elbow is worn after six months. Follow-up inspection and acceptance when handling defects.
In order to solve the problem of short operation period of spherical pneumatic blanking valve in pneumatic ash conveying system of 200,000 electrostatic precipitator, the desulfurization specialty and valve designers comprehensively analyzed the field operation and made a transformation plan. Four rotary blanking valves with ceramic valves were installed in the electric field of 1 boiler. The main advantages of this kind of blanking valve are that the sealing surface of the valve plate is made of ceramic material, which has high hardness and strong adaptability to the change of coal ash and particle size. The valve does not need a compressed air sealing system, which reduces the failure. Through the operation results and the inspection during shutdown and maintenance, the sealing surface of the valve is not damaged, the pneumatic ash conveying system runs normally, and there is no unsmooth ash accumulation in the ash hopper. In 20xx, we will continue to follow up and inspect the reformed valve to ensure the normal operation of the equipment, and at the same time confirm the final use effect of the valve, so as to accumulate technical data and feasible schemes for the next transformation of the ash conveying system.
1, No.2 electrostatic precipitator pneumatic ash conveying system 1, 16 pneumatic ash conveying silo pumps were put into operation from 20xx to 20xx, and the silo pumps frequently leaked. By measuring the thickness of the metal tank wall of the silo pump, it is found that the thickness of the tank wall is only 3 mm-5 mm (the original thickness is 12mm), and the wear and leakage parts of the tank are mainly concentrated in the inlet and outlet parts of the tank with the highest airflow speed. Therefore, the 16 silo pump will be replaced as a whole in 20xx. After consultation with the manufacturer, the price of each silo pump is about 30 thousand yuan. If 16 is replaced, in order to save the cost and fully implement the working principle of repairing the old and recycling the waste, the desulfurization specialty has carried out special investigation on the leakage situation, found the main leakage points and reasons, and found the metal material with good wear resistance. Finally, the scheme of replacing the lower cone of the silo pump to solve the frequent leakage is determined.
problem During the 20xx overhaul, all the lower cones of the 16 silo pump were replaced. After the transformation, the silo pump has no leakage, which greatly reduces the work intensity of personnel and ensures civilized production on site. At the same time, it is found that the gasification tank at the lower part of 16 silo pump is seriously damaged, which can not play a good role in gasification and suspended ash conveying system. Therefore, a field task force was set up for desulfurization specialty to analyze and study the damage of gasification tank, and decided to abandon the fluidized cloth sandwich structure used in the original equipment and transform it into porous silicon carbide. After transformation, the gasification plate is not damaged, and the gasification tank runs normally, meeting the requirements of equipment operation.
The biggest technical transformation project of desulfurization specialty in 20xx is the transformation project of No.7 boiler electrostatic precipitator, which involves three electric fields: the primary precipitator and the secondary precipitator, with an investment of more than 5 million yuan. In order to ensure the smooth progress of the renovation project and ensure that the renovation project meets the standards, the desulfurization maintenance major and desulfurization operation major jointly set up a joint inspection team to conduct comprehensive supervision and inspection of the renovation project. By participating in the renovation project, the maintenance team was trained, which greatly improved the installation, quality supervision and maintenance technology of electrostatic precipitator, and accumulated a lot of practical experience for future equipment maintenance. At the same time, during the inspection, the problems existing in the safety and installation quality of the construction unit were supervised and rectified in time to ensure the smooth completion of the renovation project. The ESP reconstruction project of No.7 boiler was officially started on August 26th, and the unit was put into operation on1October 23rd 10, with no casualties.
The electrostatic precipitator of No.7 boiler runs to 165438+ 10/8. After transformation, the electrostatic precipitator runs stably and the dust removal efficiency is obviously improved compared with that before transformation. Due to the stable operation of electrostatic precipitator, the circulating ash required for the operation of desulfurization system is ensured, and the normal and stable operation of desulfurization system is ensured.
During the overhaul of the electrostatic precipitator of boiler No.7, in view of the frequent leakage of the fluidized chute and fluidized bottom bin of the original equipment, the desulfurization specialty assigned a special person to carry out internal inspection, which completely blocked the original leakage point. The damaged fluidization cloth of the fluidization bottom bin and four fluidization chutes has been completely replaced.
In the past operation, the vacuum belt dehydrator used in 200 thousand desulfurization system often appeared belt deviation and vacuum unqualified. Taking advantage of this year's overhaul, the pleated filter cloth was replaced, the tensioning devices of the transmission belt and filter cloth were readjusted and positioned, and the damaged valves and leaking flushing pipes were replaced. The vacuum belt dehydrator is equipped with a soft plastic curtain to prevent water splashing, which ensures the civilized production on site.
In 20xx, the desulfurization specialty carried out the transformation test on 200,000 sets of four on-off valves at the top of ash storage of No.2 storage. The original on-off valve is in the form of pneumatic alloy. Because the on-off valve equipment is not only outdoors, it will inevitably be attacked by rain and snow.
Because the on-off valve does not need to be operated frequently, the defects in the pneumatic system cannot be found in time. Whenever equipment is found to be damaged, it has often developed to the point where it must be completely replaced, which not only increases the maintenance cost and labor intensity, but also brings security risks to on-site installation and production. Therefore, the desulfurization major chose the manual ceramic on-off valve in this transformation work. Manual valve is reliable in operation and accurate in judging equipment failure. At the same time, the on-off valve is made of ceramic material, which improves the wear resistance of equipment and avoids the increase of workload caused by frequent wear of equipment. 20xx was installed and used from June to 165438+ 10, and the equipment operated stably and trouble-free.
1 during boiler maintenance, it was found that the nozzle of the absorption tower was seriously blocked, and the blockage reached 30%. It seriously affects the improvement of desulfurization efficiency and increases the power consumption of slurry circulating pump. Therefore, these blocked nozzles were cut during the maintenance of the unit, and all internal blockages were unblocked. The nozzle blockage was eliminated by dredging, and the test nozzle achieved the use effect after maintenance. At the same time, the operation specialty has formulated the nozzle flushing method when the absorption tower stops, which ensures that the nozzle will not be blocked again in the future. During the overhaul of 1 2 units, 6 slurry circulating pumps, 4 gypsum discharge pumps, cyclone stations and other systems and equipment were overhauled, and 14 sets of impellers and mechanical seals were replaced, and 40 damaged slurry pipes were replaced. The normal operation of the 200,000 desulfurization system is fundamentally guaranteed.
This year, the regular maintenance project of chemical system equipment was successfully completed. The steam tracing pipeline was added to the bottom ditch of compressed air pipeline in hydrogen production station, which solved the problem that the freezing of compressed air pipeline endangered the normal operation of hydrogen production system last winter through transformation.
In order to ensure that in the winter heating work of 20xx—20xx, the chemical maintenance team will start the maintenance of the chemical heating pipe network system as soon as possible with less personnel and heavy work. The inlet and outlet valves of each water tank in the heating network system will be thoroughly overhauled and 8 sets of valves will be replaced. Then overhaul all kinds of pumps in September to ensure the normal operation of the heating network system.
After 20xx years of maintenance, the desulfurization specialty has made some achievements in the treatment of equipment defects and leakage, but the existing problems of equipment are still outstanding, such as the corrosion of 200,000 chimneys and the corrosion and leakage of 200,000 flues, which still need a lot of capital and personnel investment. However, we believe that under the correct leadership of the company and through the efforts of professional departments, the future work will certainly achieve better results.
Summary of desulfurization work Chapter 5 This desulfurization process uses ammonia water as absorbent and ammonium sulfate fertilizer as by-product. The flue gas discharged from the boiler is cooled to 90~ 100℃ by the flue gas heat exchanger, and then enters the pre-scrubber, where hydrogen chloride and hydrogen fluoride are removed after washing. The washed flue gas passes through a droplet separator to remove water droplets, and then enters a pre-scrubber. In the pre-scrubber, ammonia water is sprayed from the top of the tower to wash the flue gas, and SO2 in the flue gas is absorbed and removed by washing. After the washed flue gas is discharged, the water droplets carried by it are removed by the droplet separator and enter the desulfurization scrubber. In this scrubber, the flue gas is further washed, and the mist droplets are removed by the demister at the top of the scrubber and enter the desulfurization scrubber. Then it is heated by the flue gas heat exchanger and discharged from the chimney. The ammonium sulfate solution with a concentration of about 30% generated in the washing process is discharged from the washing tower, and can be sent to a chemical fertilizer plant for further treatment or directly sold as liquid nitrogen fertilizer, or further concentrated, evaporated and dried, and processed into granular, crystalline or blocky chemical fertilizer for sale.
Through this environmental protection training, I have a pure theoretical understanding of the waste gas, dust and wastewater produced by our power plant, and combined with our usual work practice, I deeply realized the difficulty of dealing with environmental pollutants. Although after this study, I didn't fully master it. After all, time was limited, but I gradually realized this subject from my initial disgust and carelessness. I am really grateful to the factory leaders for sending me to attend the training. In fact, I really didn't take it seriously when I was informed to attend the training. I don't think there is anything to learn outside, and there is nothing interesting. Now there really won't be any previous thoughts.
Summary of desulfurization work Chapter VI Flue gas circulating fluidized bed desulfurization process consists of absorbent preparation, absorption tower, desulfurization ash recovery, dust collector and control system. In this process, dry hydrated lime powder is generally used as absorbent, and other dry powder or slurry with absorption and reaction ability to sulfur dioxide can also be used as absorbent.
The untreated flue gas discharged from the boiler enters from the bottom of the absorption tower (i.e. fluidized bed). There is a venturi device at the bottom of the absorption tower. After the flue gas flows through the Venturi tube, its speed is accelerated, and it is mixed with fine absorbent powder, and particles, gas and particles are violently rubbed to form a fluidized bed. Under the condition of spraying uniform water mist to reduce the temperature of flue gas, the absorbent reacts with sulfur dioxide in flue gas to produce CaSO3 and CaSO4. Flue gas containing a large number of solid particles after desulfurization is discharged from the top of the absorption tower, enters the recovery dust collector, and the separated particles return to the absorption tower through the middle ash bin. Because solid particles are recycled for hundreds of times, the utilization rate of absorbent is high.
The by-product of this process is dry powder, and its chemical composition is similar to that of spray drying desulfurization process. It is mainly composed of fly ash, CaSO3, CaSO4 and unreacted absorbent Ca(OH)2, which is suitable for backfilling waste ore and road foundation.
Typical flue gas circulating fluidized bed desulfurization process, when the sulfur content of coal is about 2% and the calcium-sulfur ratio is not more than 1.3, the desulfurization rate can reach above 90% and the exhaust temperature is about 70℃. This process is currently used in foreign10 ~ 200,000 kW units. Because of its small floor space and low investment, it is especially suitable for flue gas desulfurization of old units.