On June 13, the 11th China Cement Energy Conservation and Environmental Protection Technology Exchange Conference and Equipment Renewal Forum, sponsored by China Cement Network, was held in Nanjing, Jiangsu Province. Zhang Zhenkun, Chairman of the Board of Directors of
China Cement Network, Chief Executive Officer of Asia Cement (China) Holding Company, Senior Consultant of
China Cement Network href="https://price.ccement.com/brandnewslist-1-1000179.
Shao Jun introduced that the theme of the conference was "equipment renewal, cost reduction and efficiency enhancement". Shao Jun expressed his belief that with the joint efforts of all of us, the cement industry would be able to take the lead in the crisis, open up a new situation in the changing situation, and move towards a future of higher energy efficiency and greener environmental protection. According to
https://img7.ccement.com/richtext/img/5q66rwc86fa1718247869445. Chang Chen-kun, The development of an enterprise and an industry will face the start-up period, development period, maturity period and transition period. The cement industry has stepped out of the first curve of development from 2015 to 2023 and has entered the transition period.
Zhang Zhenkun said that the transformation and development of new quality productivity will create the second curve of the cement industry and achieve a new leap forward in economic and social benefits.
< IMG SRC = "https://img7.ccement.com/richtext/img/y665zv1zjy1718248645364. Chen Zengfu introduced that technological innovation drives the upgrading of technology and equipment, and green low-carbon leads the upgrading of technology and equipment.".
Chen Zengfu pointed out that intelligent manufacturing enables new quality productivity of equipment. On the basis of specialized division of labor in production and processing, it is necessary to build an intelligent manufacturing solution for the whole process of production automation, digital management and cloud control, so as to reduce staff, increase production and increase efficiency.
< IMG SRC = "https://img7.ccement.com/richtext/img/pmt2bvmoca1718248676130. Ba Taibin pointed out that nitrogen oxide emissions are large and harmful to the environment, and the policy control is strong." Ultra-low emission targets have been clearly defined, and the completion time of technical transformation to achieve ultra-low emissions has entered the countdown. For enterprises, "denitrification technology transformation, emission standards" is necessary, and there is no other choice.
Bataibin said that the pipeline reduction denitrification technology is a technological innovation, which uses the mechanism of NOx reduction in the pipeline to control from the source. We should increase investment in scientific research, overcome technical problems, constantly improve denitrification methods, and ultimately achieve ammonia-free denitrification and discharge standards.
< IMG SRC = "https://img7.ccement.com/richtext/img/dgjqsvxry4i1718261350200. Wu Shangan pointed out that the cement industry is experiencing unprecedented economic difficulties and a shortage of talents.". Environmental protection is the red line for the survival of cement enterprises. Cement enterprises expected to survive in the future should have long-term development plans, scientific and reasonable choices, stable operation, mature technology, convenient management, low operation cost and no secondary pollution. At present, we should also consider the ultra-low emission technology route with convenient start and stop and energy saving, especially the choice of out-of-stock technology route must be based on long-term and reliable operation as the first choice.
< IMG SRC = "https://img7.ccement.com/richtext/img/ypi292t4gdg1718249846852. Gao Yuzong pointed out that co-disposal + biomass substitution is a common disposal mode at present and in the future." The mixing treatment of the hazardous waste solid waste and the biomass is beneficial to improving the incineration efficiency, realizing the elimination of the influence of the hazardous waste solid waste on the environment, realizing the carbon emission reduction, and realizing the reduction, recycling and harmlessness.
< IMG SRC = "https://img7.ccement.com/richtext/img/fy0vitndko81718269742223. Liu Wei introduced that on November 8, 2022, Jurong Taini completed all unmanned electric mine card security personnel getting off, The whole process of "loading, transportation, unloading, parking and charging" is fully realized.
The digital intelligent mine intelligent loading and unloading system mainly includes intelligent dispatching system, unmanned pure electric mine car, unmanned middle platform system, emergency takeover system, vehicle-road coordination system, unloading management system, etc., to realize the flexible zero-carbon driverless transportation of the whole process of "loading, transportation, unloading, parking and charging" of the mine car.
< IMG SRC = "https://img7.ccement.com/richtext/img/wlp7lq9ne5h1718272100067. Wang Xingpeng shared the experience of Huaxin Chongqing Diwei Company in the construction of the" Dissecting Sparrow "project for energy conservation and carbon reduction.
Wang Xingpeng said that the practice of Diwei Company has fully proved that the cement clinker production line is not the larger the scale, the more advanced, through the development and application of advanced and applicable technology, the daily production of 2500 tons of kiln line can also achieve the leading level. Huaxin will continue to take scientific and technological innovation as the starting point, take green and low-carbon as the orientation, accelerate the transformation of greening, intellectualization and internationalization, devote itself to creating new productivity in the cement industry, and contribute Huaxin's strength to the realization of green and low-carbon goals.
< IMG SRC = "https://img7.ccement.com/richtext/img/kd09et6uesa1718334646754. Wang Lan introduced zero power purchase, zero fossil fuels, zero primary resources, zero carbon dioxide emissions, zero waste emissions, The concept of 60 cement plant construction with zero employees.
Wang Lan pointed out that coping with climate change and reducing carbon dioxide and air pollutant emissions are urgent tasks for the green and sustainable development of the cement industry.
< IMG SRC = "According to yuan Liangguo, a https://img7.ccement.com/richtext/img/cdufphwv5bc1718335561758., the energy utilization rate of ball mills for grinding materials is only 2% -3%.". The power consumption of ball mill accounts for 50% -70% of the energy consumption of cement production system. Therefore, it is of great significance to study the energy saving of ball mill.
yuan Liangguo introduced that the impact powder grinder can greatly improve the grinding efficiency and subvert the working mode of the traditional ball mill.
< IMG SRC = "https://img7.ccement.com/richtext/img/3adk8c76n271718335594281. Wang Hongmei made a number of recommendations for environmental protection in cement enterprises:
1. Cement production requires pollution prevention and control in the whole process, including source control, production process optimization and end treatment;
2. Coordination consideration of pollution reduction and carbon reduction is the homework that cement enterprises should pay attention to;
3. While the requirements for organized emission of cement kilns, especially NOx, are becoming more and more stringent, the problem of ammonia escape should be paid more and more attention to; It is a trend for
4、 cement enterprises to use waste heat or purchase dried materials independently. If natural gas is used for drying, the oxygen content needs to be converted to 8% (cement national standard requirements), and it is difficult for independent grinding stations to meet the requirements steadily; Although
5、 cement enterprises have made great progress in fugitive emissions, they still need to reduce the generation of smoke and dust through fine control and continuous process improvement;
6. Measures should be taken to prevent secondary pollution in the process of co-disposal of wastes, focusing on the rational design of sources and processes; Clean transportation of
7、 is one of the most important environmental protection requirements for the cement industry, and it is also the most difficult, but it is unstoppable;
8. With the continuous improvement of monitoring and control means, cement enterprises are required to gradually improve the overall environmental protection level through fine management; The environmental protection level of
9、 enterprises must be continuously improved, and environmental managers should improve their level through continuous learning.
< IMG SRC = "https://img7.ccement.com/richtext/img/rjd2u64n5e1718335712627. Zou Weibin said," The new standard of GB175-2023 "General Portland Cement" puts forward new technical requirements for the existing cement grinding process, which needs to be followed up and implemented.
Zou Weibin pointed out that in the production process, great attention should be paid to the influence of particle size distribution of cement products on physical and chemical performance indicators, especially on strength and water demand indicators.
< IMG SRC = "https://img7.ccement.com/richtext/img/0lqa1n4ueolk1718252991432. Li Kunming pointed out that coal currently accounts for the majority of energy consumption and cost in the cement industry, and the key to reducing cost and increasing efficiency is to control coal.".
In terms of the development and application of new energy, the current installed capacity of photovoltaic in the cement industry is 1 GW, and Li Kunming expects to reach 2 GW in 2025 and 7 GW in 2030.
In terms of alternative fuels, Li Kunming said that alternative fuels have obvious consumption reduction effect and large development space, but there are still some problems, such as single source, unstable calorific value, high moisture content and poor economic benefits.
< IMG SRC = "https://img7.ccement.com/richtext/img/otxfg1x1c6e1718335666864. Fang Tao introduced the construction path and concept of the ultra-low emission integrated platform." The platform can help enterprises to monitor the data in real time and present it in a visual way, so as to realize the fine control of pollution emission sources.
< IMG SRC = "https://img7.ccement.com/richtext/img/5q01mexnb121718248714046. Miao Runkang introduced the concept of intelligent factory construction and clarified the importance of intelligent factory construction.".
Miao Runkang pointed out that intelligent factories can improve the utilization rate of mineral resources, prolong the service life of mines, promote the synchronization of visualization and informatization, realize fine management, and significantly improve production efficiency and equipment operation rate. According to
https://img7.ccement.com/richtext/img/0pmoiuhooud1718248743249. Lu Shoujiang, At present, the application of carbon capture technology is facing many challenges, such as high cost of emission reduction, mismatch of sources and sinks, urgent deployment time, lack of business model and so on.
Lu Shoujiang introduced that the use of steel slag to capture and solidify CO2 in flue gas from steel, cement and power industries can solve the stability problem of steel slag, improve its activity and improve its grindability.
< IMG SRC = "According to https://img7.ccement.com/richtext/img/moz51yl9je1718249810355. Feng Changlin, nearly 60% of the cost of cement production comes from energy (coal & electricity)." More than 50% of the operating cost of the dust collection system is the power consumption of the fan. Therefore, saving the power consumption of the fan = reducing the operating cost.
< IMG SRC = "https://img7.ccement.com/richtext/img/xxygsjshmke1718249920433. Jiang Baoqing pointed out that the selection of SCR denitration technology route must be combined with flue gas conditions.". The content of chloride ion in some production line dust is high, which is easy to form reddish-brown crusts on the upper surface of the catalyst, and then block the catalyst, which is extremely difficult to remove. It is suggested that most of the dust containing chloride ions should be removed in advance to reduce or eliminate the formation of crusts.
< IMG SRC = "https://img7.ccement.com/richtext/img/fcj0r3x4yw61718249975113. Li Xiang pointed out that castables are prone to wear and crack in key parts during use." Non-standard construction, drying and baking lead to more unstable service life, which can not reach the advanced index in the industry: 5 years service life outside the kiln.
Titanium-aluminum ceramic composite is the main solution at present. Ceramic materials have high strength and high corrosion resistance in high temperature environment. The long-term use temperature of titanium-aluminum alloy fibers is 1450 ℃, and the content of steel fibers in titanium-aluminum ceramic materials is as high as 30%.
< IMG SRC = "According to https://img7.ccement.com/richtext/img/b41lo5ah47j1718261380371. Zheng Jinru, bag-type dust collectors are important equipment in cement production." Capable of filtering exhaust gas and collecting dust. He pointed out that there are some problems in the current manual inspection, such as heavy workload, high risk, difficult to find and difficult to locate. The intelligent diagnosis scheme of bag filter can reduce the cost of equipment and improve the stability and safety of equipment operation.
< IMG SRC = "https://img7.ccement.com/richtext/img/g9m3ky86oab1718261414843. Shi Wenguo introduced the five core technologies of maglev power energy-saving equipment:
1." The high-efficiency permanent magnet synchronous motor is directly connected with a three-dimensional flow turbine, the transmission efficiency is high, and the energy efficiency reaches the first level
; 2, the magnetic suspension bearing system is friction-free, lubrication-free, high-efficiency and low-noise
; and 3, the fluid component is a three-dimensional flow impeller backward-bent design, The highest pneumatic efficiency reaches 89.8%
. 4. High-efficiency frequency converter and automatic anti-drop system: independent research and development of frequency conversion technology, high efficiency and energy saving
. 5. Intelligent operation and maintenance management system: in-depth integration of Internet of Things and big data. Full life cycle equipment operation and maintenance management
< IMG SRC = "https://img7.ccement.com/richtext/img/ko6mb56y8cg1718261448594." For the transformation of the spreader box, Zheng Yiqi pointed out that the installation position of the spreader was too high. Has great influence on that retention time and the heat exchange of the material in the preheater, and the downward movement of the length of the material spread box is equal to the extension of the length of the gooseneck tube of the decomposing furnace, thereby having less investment and quick effect. However, it is necessary to consider the coverage area, heat exchange capacity and impact force of materials in order to determine the direction of technical transformation.
In the transformation of cyclone inlet, Zheng Yiqi said that the angle between cyclone inlet and column diameter is too large, which will cause the negative pressure of the system to rise, the higher the negative pressure, the smaller the air volume.
< IMG SRC = "https://img7.ccement.com/richtext/img/a8f4a1c0ndp1718266128429. Fu Hongzheng introduced the development status of cement and refractories for cement kilns in China.". Most of the dry-process cement rotary kilns
in China are production lines below 6000t/d. With the development of the cement industry, the maximum production capacity is 10000-12000 t/d at present, and more than 30 production lines above 10000 t/d have been built or are under construction in China.
In recent ten years, various kinds of basic refractory bricks produced with iron-bearing raw materials have solved the problem of chromium-free refractories in China's cement industry, basically meeting the demand for chromium-free refractories for cement rotary kilns below 5000t/d.
Fu Hongzheng said that with the increase of kiln diameter, the ellipticity of rotary kiln increases, the mechanical stress and thermal stress of refractory bricks increase accordingly, and the performance of refractory bricks has higher requirements.
< IMG SRC = "According to https://img7.ccement.com/richtext/img/fsbu1ethlub1718266174663. Liu Dong, In view of the gradual improvement of ultra-low emission requirements of NOx in cement industry, especially after the ammonia escape index is included in the standard and monitoring scope, the existing technologies such as low nitrogen combustion technology, staged combustion technology and SNCR denitrification technology are difficult to meet the requirements of ultra-low emission and ammonia escape of 50 mg/Nm3 for a long time. Therefore, it is very necessary to adopt the mature selective catalytic reduction (SCR) technology to meet the requirements of ultra-low NOX emission of cement and ammonia slip standards.
< IMG SRC = "https://img7.ccement.com/richtext/img/sran421gcv1718266463526. Rong Weilong introduced that the catalyst is designed according to the required service life. The denitration rate, ammonia escape and ammonia water consumption have no obvious change. If the design is less, or the catalyst performance is insufficient, after a period of operation, a large amount of ammonia injection will be needed to meet the standard, which is equivalent to "insufficient power, people need to push the car".
Rong Weilong said that if we want to achieve the same service life and effect as the new catalyst, we can increase the amount of catalyst to improve the basic activity and surplus activity.However, due to the existence of various impurities in the raw materials, the SO2/SO3 conversion rate of the catalyst is generally high, which will lead to the blockage of ABS substances and corrosion of subsequent equipment, resulting in greater losses. Therefore, although the development of denitrification technology abroad is more than 50 years earlier than that in China, few catalysts with waste raw materials are used.
< IMG SRC = "https://img7.ccement.com/richtext/img/zxr7ernz611718266501500. Wei Tao said that At present, there are some problems in the dust collection system of finished products, such as high filtering wind speed, substandard dust emission, poor dust removal effect and high system resistance.
Wei Tao said that at present, the dust of cement mill finished product dust collector is required to achieve ultra-low emission, while further reducing the system operation resistance, reducing production power consumption, folding filter cartridge is a technical means to solve the problem.
< IMG SRC = "https://img7.ccement.com/richtext/img/h88op193ud81718266532468. Kang Minhui introduced that the metal membrane filter bag can remove dust from high-temperature flue gas with high precision and realize high-temperature and low-dust denitrification." It can effectively prevent the denitration catalyst from poisoning and make the exhaust gas reach the ultra-low emission standard. It reduces the abrasion of high dust on the catalyst, and the service life of the catalyst can be as long as 5 years. The usage amount of the catalyst is only 1/4 of that of the high-dust denitration and the medium-dust denitration, thereby reducing the treatment amount of hazardous wastes and making the most effective use of resources.
< IMG SRC = "https://img7.ccement.com/richtext/img/1oddl8bdcnni1718267735632. Chi Peng introduced that large cement rotary kilns in China generally use silicon mullite bricks and magnesia-alumina spinel bricks.". Because of its high thermal conductivity, the temperature of the outer wall of the front and rear cylinders is too high during the operation of the cement rotary kiln, with an average of about 350 ℃ and a maximum of 400 ℃.
Chi Peng said that the special mullite brick for cement kiln has the advantages of low porosity, low density, high load softening temperature, high thermal shock stability and low thermal conductivity.
< IMG SRC = "https://img7.ccement.com/richtext/img/6vuyu1vtarj1718267767672. Guihua Zhou said that the heat-resistant steel hanging pieces are commonly used in the inner cylinder of cement preheater." However, due to the corrosion of harmful substances such as high temperature, high-speed airflow, high alkali content and excessive chloride ions in the inner cylinder of the preheater, the erosion of materials is accelerated under special working conditions, resulting in the rapid oxidation and corrosion of heat-resistant steel hangers, and the phenomenon of layer-by-layer fracture and shedding, thus blocking the preheater and forcing the kiln to be shut down for maintenance, and the service cycle of heat-resistant steel hangers is lower than that of the kiln liner, resulting in asynchronous maintenance. Greatly affected the production.
Zhou Guihua said that nanocomposite ceramics can significantly improve strength, toughness and high temperature resistance, while nanocomposites can also improve the hardness, corrosion, elastic modulus of materials, and have an impact on thermal expansion coefficient, thermal conductivity and thermal shock resistance.
< IMG SRC = "https://img7.ccement.com/richtext/img/cjsz1gwjjfn1718268841751. Ji Xudong introduced that SNCR + SCR denitration technology is currently used in the implementation of ultra-low emission transformation of denitration in China." At present, more than 200 production lines have adopted SCR denitrification technology, and the implementation of SCR transformation of cement kiln tail to reduce NOx emission is the direction of technical transformation of cement emission reduction.
Ji Xudong said that the application technology of SCR in cement industry has matured, and cement enterprises pay more attention to the application scenarios under special working conditions of their own production lines.
< IMG SRC = "https://img7.ccement.com/richtext/img/fxpsuzrmm7q1718272774763. Liu Wenjing introduced that HeSNCR is an efficient and accurate SNCR system. When combined with SCR, it can give full play to its value. The front-end preheater injects ammonia. SCR uses ammonia escape and auxiliary ammonia injection to denitrify again, which can achieve ultra-low emission of 50mg/Nm3 and ammonia escape of 5mg/Nm3. The HeSNCR + SCR combined solution technology is not a simple combination of the two processes, but a new solution combining the high efficiency of SCR technology and the economic and applicable investment of HeSNCR technology.
< IMG SRC = "https://img7.ccement.com/richtext/img/4yxs1022mh81718271446817. Sun Zhengjun said that Cement enterprises have been impacted by multiple unfavorable factors such as intensified market competition, high cost of upstream raw materials and fuels, and enhanced binding force of environmental protection and energy consumption. Enterprises need to pay more attention to operational efficiency, cost control and innovation of profit model to cope with market changes and challenges. The cement industry has entered a new era of "operation is king".
Sun Zhengjun introduced that the high-efficiency reheat technology power generation system has high cycle thermal efficiency and low power consumption, which can make better use of the surplus waste heat and flue gas of the production line and improve the power generation efficiency. Zhu Shunming, general manager of
Jiangsu Jida Powder, wrote "Realizing the power consumption of P.O42.5 grinding 19.9 kWh/tP.C42". Zhu Shunming introduced that the factors affecting the production of low energy consumption and high performance cement are numerous and complex, involving raw materials, proportioning, calcination, grinding and other aspects of cement production.
In order to adapt to the new energy-saving policy of "carbon peak and carbon neutralization" in the national cement industry, Jiangsu Jida Powder Engineering Design and Research Institute independently developed the third generation of "cement semi-final powder combined grinding process system", which has been successfully applied in the new and renovated cement grinding production lines of domestic cement enterprises.
< IMG SRC = "The brilliant conference report in the https://img7.ccement.com/richtext/img/847wqz2kfqw1718337797801.
made the guests applaud. People also benefited a lot from the dazzling exhibition booths outside the venue.
< IMG SRC = "On the afternoon of https://img7.ccement.com/richtext/img/uvwa9vfgtcm1718268663760.6 14, The guests also visited Jurong https://price.ccement.com/brandnewslist-1-1000094., a state-level green factory and a state-level green mine.
