On May 27, the "2025 China Cement Double Carbon Conference and the 13th Energy Conservation and Environmental Protection Technology Exchange Conference" was successfully held in Wuhan, Hubei Province. Lu Guixin, former first-level inspector of the Department of Raw Materials Industry of
the Ministry of Industry and Information Technology, Wang Fazhou, Standing Committee and Vice President of the Party Committee of Wuhan University of Technology, Ma Weiping, Chairman of OCC, Wei Huashan, Chairman of Queshi Cement Group Co., Ltd., and Wang Xuejun, Executive Chairman of Hubei Cement Industry Association. Wang Lei, President of North Cement Co., Ltd., Xu Li, Vice General Manager of Tangshan Jidong Cement Co., Ltd., Chen Zhongsheng, Vice President of Shandong Shanshui Cement Group Co., Ltd., Zhu Gang, Deputy Engineer of Tianshan Material Co., Ltd. Xu Yue, Assistant General Manager of Anhui Conch Cement Co., Ltd. 
, delivered a speech and pointed out that from January to April, the value added of industries above designated size increased by 6.4% year-on-year." Unfortunately, in the first four months, the added value of the building materials industry decreased by 0.5% compared with the same period last year. In particular, the total output of cement, the backbone building materials industry, in the first four months was only 495 million tons, down 2 from the same period last year. This fully shows that the cement industry is most affected by the decline of the real estate industry, and the task of achieving steady growth and improving efficiency is very arduous.
At present, global climate change is bringing severe challenges to human survival and development, and reducing carbon emissions and achieving carbon neutrality have become a global consensus. As a responsible big country, China actively implements its carbon emission reduction commitments and contributes to global climate governance. Cement industry is a key area of energy consumption and carbon dioxide emissions, and its carbon emission reduction process plays a vital role in achieving the goal of "double carbon" in China. With the increasingly stringent constraints on national energy intensity and carbon emissions, it is urgent to reduce carbon emissions in the cement industry.
Cement industry is an important basic industry of the national economy, which must adapt to the needs of the development of the situation, shoulder the responsibility of carbon reduction, regard green development as the core of the development of the industry, and actively participate in carbon emission reduction actions, which is not only responsible for the environment and society, but also an inevitable choice for the sustainable development of the industry.
However, we should be more aware that good economic benefits are the solid foundation for the transformation and upgrading of the cement industry. Without the support of economic benefits, it is difficult for enterprises to invest resources in technological innovation and equipment upgrading, and energy saving and carbon reduction will become passive water. Only by balancing green development and economic benefits can industry achieve long-term prosperity.
At present, the cement industry is facing multiple pressures such as shrinking demand, overcapacity and high cost, and the situation is grim and complex.". Faced with the current predicament, the first is to strengthen industry self-discipline. Second, we should accelerate transformation and upgrading, and make every effort to promote energy-saving and carbon reduction transformation. Third, speed up the pace of capacity reduction in the industry.
As a think tank of the cement industry, China Cement Network has always kept pace with the times and bravely shouldered the mission of the industry. We are well aware that data is an important asset driving the green transformation of the industry. To this end, China Cement Network, relying on the deep industrial data resources accumulated over the years, has built a comprehensive and multi-level data monitoring and analysis system with big data, market communication, cement index, concrete index and photovoltaic glass index as the core, relying on AI technology and cement big data, to provide comprehensive factor data support for the green development and low-carbon transformation of the industry.
The conference brought together top experts in the industry, outstanding business representatives and resources from all sides. It is hoped that through this double carbon conference, in-depth exchanges and cooperation, brainstorming, overcoming technical difficulties, accelerating the implementation of policies, and achieving efficient docking of resources. At today's conference, Cement Network will also release the world's first "2025 Cement Industry ESG Ranking List", set up industry benchmarks, lead the whole industry to actively practice social responsibility, and move towards a new journey of green and high-quality development.
At the same time, Wang Hongmei put forward 10 suggestions on the environmental protection work of cement enterprises.
1. Cement production shall be subject to pollution prevention and control in the whole process, including source control, production process optimization and end treatment;
2. While the requirements for organized emission of cement kilns, especially NOx, are becoming more and more stringent, the problem of ammonia escape shall be reduced by means of precise ammonia injection;
3. The selection of cement kiln denitration technology should be combined with the actual situation of enterprises, and SCR technology should be based on low nitrogen and staged combustion;
4. In the production of carbide slag cement, the pre-drying of carbide slag and the reduction of oxygen content in the drying process are the key points to improve the process technology. When the ammonia in the carbide slag is too high, it is necessary to increase the water spray/pickling tower to reduce the ammonia escape;
5. Cement enterprises have made great progress in fugitive emission, but they still need to reduce the generation of smoke and dust through fine control and continuous improvement of process;
6. Measures should be taken to prevent secondary pollution in the process of waste co-disposal, focusing on the rational design of source and process;
7. Clean transportation 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;
9. Enterprise environmental management requires environmental protection personnel to improve through continuous learning, including production technology, treatment technology, etc;
10. In the past two years, the central air pollution prevention and control fund has focused on supporting cement ultra-low transformation projects (transformation and upgrading of organized and unorganized emissions on the basis of meeting the emission standards), and enterprises need to put them on the agenda as soon as possible.
For enterprises, the types of carbon assets include carbon quotas issued by the government through free allocation and auction; the process of developing carbon emission reduction projects and issuing certified emission reductions is equivalent to the primary market; the carbon emissions of emission control enterprises need to be compensated by carbon assets. Carbon assets can be obtained in the primary market or purchased directly in the secondary market. If the carbon assets held by emission control enterprises are insufficient to offset their carbon liabilities, they need to purchase more carbon assets, or strengthen energy conservation and emission reduction to reduce the scale of carbon liabilities.
Carbon assets management is through specialized management, can greatly improve the circulation of carbon assets, revitalize carbon assets, achieve value preservation and appreciation, for emission control enterprises, under the premise of ensuring performance, optimize the management and use of carbon assets, not only can reduce the cost of carbon emission performance, but also can reduce the cost of carbon emission performance. It can also broaden financing channels and improve profitability for enterprises.
of digitalization transformation, relying on the conch "Yungong" industrial Internet platform, we will build a unified digitalization base for the group, establish a unified standard and security protection system, integrate identification analysis, edge computation, large data platform and AI large model technology, and realize equipment interconnection, data intelligent application, industrial development analysis and decision-making. Support the green and intelligent transformation of the whole chain of cement manufacturing.
According to reports, the annual production electricity consumption of Jining Conch 5000t/d clinker base plant is about 143 million degrees, five forms of green renewable energy power generation projects, installed capacity of 55.46 MW, annual power generation of about 165 million degrees, saving 20000 tons of standard coal, reducing carbon dioxide 12.
Practice has proved that intelligent transformation is an important core path of carbon emission reduction in the cement industry, through the construction of an ecological model of development cooperation and technology sharing, driving cross-plate and cross-industry collaborative innovation, realizing resource integration and value reconstruction of the industrial chain. Jointly promote sustainable green industry, Intelligent high-quality development
In addition, Qi Yanyong said that the use of oxygen enrichment is an important measure to improve the firing capacity. The most direct way is to buy oxygen directly, because in most provinces in China, oxygen is not easy to sell, nitrogen is easy to sell, and the cost of oxygen is not necessarily high, so the cost of direct purchase of oxygen by enterprises is not high. After a factory in Henan added oxygen, the temperature of 5000t/d production line rose from 1591 degrees to 1710 degrees.
Qi Yanyong also said that raising the temperature without burning bricks is an important issue in the industry. The damage of rotary kiln bricks is caused by the wrong position of the flame. Therefore, in order to save energy, reduce the cost, improve the quality and have strong adaptability, the flame temperature should be increased, or the short and thick flame should be realized. In this case, oxygen-enriched combustion can play a better role.
Wang Xingpeng pointed out that the characteristics of flue gas in cement industry are complex, compared with the sticky nature of flue gas dust in power plants, carbon emissions of alternative fuels need to be calculated separately and deducted, so it is difficult to ensure the accuracy of CEMS.
Wang Xingpeng also said that the emission sources covered by CO2 CEMS online monitoring are different from those covered by the existing accounting methodology in the cement industry. The results of CO2 CEMS online monitoring and accounting are different, and the measurement of flue gas velocity is the main source of error, which is greatly affected by instruments and equipment, monitoring points, flue gas flow field, operation and maintenance quality, etc., and the technical threshold of carbon monitoring and operation and maintenance costs are high. The key parameters of carbon accounting are highly uncertain, and the measurement deviation of clinker output, coal consumption and alternative raw materials is widespread.
Wang Xingpeng believes that the next step of cement industry carbon measurement data governance and quality improvement mainly includes two aspects: 1, carbon data key common measurement technology research; 2, the establishment of "energy measurement-carbon measurement-carbon accounting" traceability platform.
At the same time, the use of three-dimensional digital aerial photography technology, three-dimensional modeling and GPS navigation loaded by electric mine car in the "smart mine" system for mining planning, blasting, quality inspection, personnel positioning, vehicle intelligent scheduling, e lectronic boundary piles, environmental monitoring, slope early warning and other links to monitor and warn, to achieve a fixed point. Unmanned measurement, fixed-point unloading, automatic scheduling, automatic early warning and other functions, improve the production efficiency and safety level of the mine in all aspects, and realize the comprehensive and systematic management of mining quantity and quality.
Tan Junwei said that the SCR technology scheme of high temperature and medium dust is reliable and stable, and there is no need to set up a flue gas bypass system to ensure the synchronous operation of denitrification devices and cement kilns, and the environmental emission index is stable and better than ultra-low emission requirements. The high temperature and medium dust technology with mature technology and reliable operation is selected, which has very good adaptability under various complex working conditions. In the aspect
of unorganized emission control, it is generally required that under the premise of ensuring safe production, measures such as sealing and sealing should be taken first, and the collection rate of waste gas should be effectively improved by increasing the area of dust collection hood, increasing negative pressure and atomizing spraying, and no visible smoke and dust should escape from dust-producing points and workshops.
Chemical absorption, membrane separation/membrane absorption and solid adsorption are the main methods of carbon capture from industrial flue gas, and the development of advanced carbon capture technology is an important task to promote carbon emission reduction from industrial flue gas. Chemical absorption is a relatively mature carbon capture technology, which has been widely used in the separation of CO2 from process gases in the petrochemical industry. However, when it is applied to industrial flue gas with atmospheric pressure, wet saturation, high oxygen content and low CO2 partial pressure, There are still many problems.
Under the existing technical conditions, due to the limitation of operating conditions, the industrial application of pressure swing adsorption and membrane separation process is excluded, and chemical absorption is relatively the most feasible industrial application technology! Technological achievements produce direct economic benefits 7.
system can automatically identify abnormal events, timely warning and reminding, effectively avoid potential safety hazards such as fleeing goods, stealing goods and exchanging goods on the way, improve the efficiency of enterprise management, reduce costs and increase efficiency, help enterprises to enhance market share and enhance brand influence.
At the same time, based on the intelligent management and control system of cement cargo flow direction, real-time calculation is carried out by using on-board intelligent terminals and sensors, and custom electronic fence is supported to delineate loading area, unloading area and transportation route, automati C perception of vehicle location and status, and abnormal conditions such as yaw, abnormal parking, loading and unloading in non-designated areas are automatically detected. Realize in-transit visual management. Through the change of vehicle trajectory and the weight of transported goods, and the precise management of assisted transportation, the problem of cargo supervision is solved.
Fu Hongzheng pointed out that the main reasons for the damage of refractory materials in large cement rotary kilns include: 1. Chemical erosion at high temperature; 2. Thermal stress and mechanical stress; 3. Abrasion.
In the large-scale cement production line, with the increase of the diameter of the rotary kiln, the ellipticity of the rotary kiln increases, and the mechanical stress and thermal stress of the refractory brick increase year by year, which has higher requirements for the high temperature strength and flexibility of the refractory brick. At the same time, high production has higher requirements for the wear resistance of refractory materials. In addition, the higher production also increases the concentration of (R2O) thio-chloro-alkali salt in the rotary kiln; the promotion of waste co-processing technology makes this problem more prominent.
Fu Hongzheng said that the performance requirements of the 10,000-ton kiln firing zone for refractory bricks include three aspects: 1. Excellent resistance to sulfur, chlorine, alkali and salt penetration and erosion; 2. Good kiln skin adhesion; 3. Excellent resistance to mechanical stress and thermal stress.
1. Alternative fuel sources: industrial and commercial garbage, decoration garbage, domestic garbage, waste oil, organic solvent, etc.
2. Fuel quality: decomposition furnace > 3300Kcal/kg (size: 50mm), kiln head > 4500Kcal/kg (size: <30mm ).
3. Equipped with compatibility and kiln feeding system to ensure uniform calorific value, uniform size, stable transportation and accurate measurement.
4. Adopt the multi-point feeding mode of kiln head + decomposition furnace + flue gas chamber + tertiary air duct to easily increase the TSR substitution rate to 60%.
5. Add harmful material sorting machine for fuel preparation pretreatment, or introduce bypass ventilation process to reduce the impact of harmful elements.
浙公网安备33010802003254号