At present, the development of the domestic cement industry has entered a period of deep adjustment, facing the dual pressures of overcapacity and shrinking market demand as a whole. The pressure on the operation of enterprises has intensified, and cost reduction and efficiency enhancement have become the core demands for the survival and development of major cement enterprises. At the same time, with the steady progress of the dual-carbon target and the increasingly stringent assessment of emission reduction in the industry, carbon reduction is no longer an optional topic, but a hard task for sustainable operation of enterprises.
For a long time, most carbon reduction technologies have the problems of high investment, slow return and difficult landing, which makes many cement enterprises fall into the development dilemma of "reducing emissions and increasing burdens". How to screen the carbon reduction path with strong landing, high cost performance, both emission reduction and efficiency value, and solve the contradiction between environmental protection and efficiency development has become the key to the transformation and upgrading of the cement industry. Shen Weiguo, a researcher and doctoral supervisor at the School of Materials Science and Engineering of Wuhan University of Technology, made an in-depth analysis of the development status of carbon neutralization in the cement industry and the mainstream landing carbon reduction technology, which provided a clear direction for enterprises to accurately lay out the carbon reduction track and tap new profit growth points.
Shen Weiguo said that the carbon neutralization of the cement industry is the long-term goal of the sustainable development of the cement industry, and the cement industry as a whole has entered the channel of overcapacity and shrinking demand. Carbon reduction technology increases the investment of enterprises, but in a sense, it also seeks new profit growth points for cement enterprises, so the choice of carbon reduction path is very important. The landing carbon reduction path with practical value in the industry is mainly divided into four categories, and the emission reduction efficiency, landing difficulties and profit potential of various technologies are different.
One is carbon reduction of alternative fuels. At present, urban garbage, energy-containing solid waste and urban solid waste are widely used as alternative fuels, and enterprises have reached a consensus on this, and their enthusiasm is high. With the formation of consensus, its profits will gradually tend to balance. Restricted by the source and substitution rate of alternative fuels, its carbon reduction effect is relatively not very obvious. As a highly popular way of carbon reduction in the industry, this path has low technical threshold and low landing difficulty, and is suitable for most cement enterprises. It is a conventional choice for enterprises to reduce basic emissions and optimize fuel structure. However, due to the shortage of raw material supply, it is difficult to achieve large-scale and deep carbon reduction.
The second is the application of common alternative calcium raw materials. For example, some high-calcium industrial waste residues (carbide slag, steel slag) are used to replace limestone to reduce the carbon emissions of raw materials produced by the decomposition of calcium carbonate, and the emission reduction effect is obvious. At present, there are also great constraints, and the distribution of carbide slag is relatively limited, especially with the improvement of the standard of water-soluble hexavalent chromium in cement in the future, the application of steel slag may be very limited, and the emission reduction effect will also be affected. The core advantage of this technology is that it relies on industrial solid waste to replace traditional mineral resources, which can not only reduce the carbon emissions caused by limestone mining, but also realize the resource utilization of solid waste. However, the continuous upgrading of environmental protection standards in the industry has greatly reduced the application space of raw materials, and the limitations of large-scale promotion of technology have gradually become prominent.
Third, industrial waste gypsum co-production of cement sulfuric acid. As a result of geopolitics and the war between the United States, Iraq and Israel, the import of sulfur has risen sharply, resulting in a sharp rise in the price of industrial blood sulfuric acid, which has not been successfully promoted for a long time. Because the quality of sulfuric acid and cement clinker produced by this technology does not have strong competitiveness and uncertainty in the future, enterprises that can achieve stable production and product quality guarantee will achieve excess profits and good emission reduction effect. In the current market environment of high prices of chemical raw materials, the technology is facing a phased development opportunity, which has dual values of solid waste utilization and product income generation, but the lack of product market competitiveness and high production stability requirements put forward extremely high requirements for enterprise technology management and control capabilities, only a few high-quality enterprises can rely on the technology to achieve long-term profit and carbon reduction win-win.
And fourthly, steel slag phase separation clinker. The steel slag phase-separation clinker can convert the steel slag into high-quality clinker at zero cost, improve the substitution rate of the steel slag for the clinker, reduce the coal consumption of the clinker, have the advantages of low hydration heat of the clinker product, better wear resistance, better corrosion resistance and the like, and solve the problems of easy grindability, narrow firing range and water solubility of hexavalent chromium of the steel slag through the unique principle of fused sintering. At present, some enterprises have not really mastered its core technology, and the content of steel slag is too low to give full play to the core value of the technology. But even so, the effect of waste utilization and low carbon has been very obvious, which is the choice of reducing cost efficiency and energy saving and emission reduction in the current situation. Compared with the traditional solid waste utilization technology, this path thoroughly solves the industry pain point of steel slag application, the multiple advantages of zero-cost raw materials, low energy consumption production and high-quality products, and perfectly meets the core needs of current cement enterprises to reduce costs, reduce emissions and improve quality. It is the carbon reduction and efficiency technology with the highest cost performance and the most prominent landing value at this stage.
To sum up, the carbon reduction transformation of cement industry is not only a simple cost input, but also a core opportunity for industrial upgrading and tapping new increments. Under the pressure of the overall operation of the industry, cement enterprises need to abandon the idea of blindly following the trend of carbon reduction, combine their own production scale, technical strength and resource conditions, and select the best carbon reduction path.
On July 29-30, China Cement Network will hold the 15th China Cement Energy Conservation and Environmental Protection Technology Exchange Conference and the 7th Intelligent Summit Forum in Wuhu, Anhui Province. This conference focuses on the practice of carbon market performance, the path of energy saving and carbon reduction technology, the experience of ultra-low emission transformation and the intelligent operation and maintenance scheme to help the industry go steadily and far in the "double carbon" era. At that time, Shen Weiguo , a researcher and doctoral supervisor of the School of Materials Science and Engineering of Wuhan University of Technology, will be invited to attend the 15th China Cement Energy Conservation and Environmental Protection Technology Exchange Conference and the 7th Intelligent Summit Forum . And make a keynote report on the theme of carbon emission reduction in the cement industry!
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