Of course, different cement production processes will also lead to different energy consumption.

The specific energy consumption can be referred to the following list: for the firing system equipment, all high-quality thermal insulation materials with low thermal conductivity system can be used, and this technology has been widely used in China.

If we really want to apply it to actual production, we need more research and try.

2 Use of alternative fuels to reduce CO2 emissions during the production of fossil fuel cement.

These materials can reduce the hidden carbon in future concrete.

Improve the clinker quality and reduce the clinker coefficient.

Of course, since it is waste, it must also be considered that it contains substances that pollute the environment, which also needs to update the purification and filtration technology to match.

01 Energy saving and carbon reduction technology path in the cement industry As far as the current common cement production process is concerned, carbon dioxide emissions mainly come from fuel combustion and clinker production, and the two processes of raw meal pre-decomposition and rotary kiln account for about 90% of carbon emissions in the production process.

Other technologies such as cement proportioning detection are mainly used to reduce cement production loss and carbon emissions by improving cement quality control and effectively guiding production.
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However, calcium substitute raw materials have problems such as insufficient source, unstable composition and influence on cement quality.

Picture: Sun Ting, “Research on Carbon Emission Accounting and Low-carbon Development Path of Cement Industry” The traditional process of producing cement clinker is to decompose limestone under high temperature environment to produce a large amount of carbon dioxide.

Table 1 is based on GB16780 “Energy Consumption Quota per Unit Product of Cement”, and the relevant calculation of energy consumption values of “comparable clinker” and “comparable cement” is comparable.

Replacing limestone with calcium industrial solid waste can significantly reduce the emission of carbonate decomposition.

The European Cement Association predicts that the use of calcium substitute raw materials will reduce CO2 emissions by 3.5% by 2030 and 8% by 2050.

It can be seen that the use of calcareous substitute raw materials can significantly reduce CO2 emissions and has a large space for promotion and application.

7 At present, the use of end-of-pipe carbon capture and storage technology CCUS is one of the globally recognized effective ways to solve high carbon emissions, that is, to purify the carbon dioxide emitted in the production process, and then put it into the new production process, which can be recycled, rather than simply stored.

Solid alternative fuels mainly include wood chips, plastics, agricultural residues, waste tires, petroleum coke, etc; Liquid alternative fuels mainly include mineral oil, hydraulic oil, etc; Gaseous alternative fuels mainly include coke oven gas, refinery gas, cracking gas, and gas generated by buried waste.

The development of low carbon cementitious material Portland cement has the defects of high energy consumption and high temperature chamber gas (CO2) emission.

At present, cement production is mainly divided into dry process and wet process.

Therefore, the CO2 emission values of clinker and cement in the paper are calculated according to this principle.

It is necessary to develop low carbon cementitious material system and partially replace Portland cement scientifically.

4 Reduce the CO2 emission from carbonate decomposition of raw materials Use calcium to replace the carbonate decomposition of raw materials in cement production to produce 57.73% CO2.

Alternative fuels can be divided into solid alternative fuels, liquid alternative fuels and gaseous alternative fuels.

1.

If the demand for cement remains unchanged or increases, then the price may rise and the supply may not meet the demand.

Under the condition of ensuring the same cement performance, the better the clinker quality, the more admixture can be added.

8.

However, it is worth noting that, such as fly ash and flue gas desulfurization gypsum, because they are the products of coal power, with the replacement of coal power, its by-products will certainly decrease gradually in the future.

5 Select the appropriate process type.

China’s digital development has already penetrated into industrial manufacturing, and the comprehensive implementation of digital and intelligent technological transformation of cement production is also an effective way to improve the current situation of high energy consumption.

China has begun to use slag, steel slag, fly ash, sulfuric acid slag, flue gas desulfurization gypsum, coal gangue and other wastes for cement production.

When the amount of admixture increases by 1%, the amount of cement clinker can be reduced by 1%.

According to the characteristics of cement production process, the development of a series of energy-saving technologies and monitoring management software by using digital management such as platform-based monitoring and energy-saving technology is also the focus of engineers at present, such as low-temperature waste heat power generation and cement kiln energy-saving monitoring.

Improve the technological level and reduce the unit energy consumption of cement Since the 1980s, China’s cement technological level has been continuously improved and the unit energy consumption of cement has been continuously reduced.

Cross heat exchange refers to alternating the materials in the two bins in the heat exchange preheater, and the material flow crosses into the parallel air flow, so that 100% of the materials exchange heat with 50% of the air flow to further improve the heat exchange rate of the system and reduce the temperature of the exhaust gas.

3.

However, the development of CCUS in China is still generally difficult.

6.

With the continuous development of the economy and infrastructure in the world, the demand for cement is increasing year by year, and the negative effects on the earth’s ecological environment and climate change are gradually obvious.

At present, a foreign team has developed an integrated solution of dry powder intelligent factory, including cloud technology, equipment and construction waste production.

Waste oil, waste tires and sludge are widely used as alternative fuels, among which waste oil has the highest calorific value and the lowest carbon emission factor.

China Conch Group has developed a demonstration production line project for carbon dioxide purification and environmental protection of cement kiln flue gas.

However, such as the use of cross heat exchange or multistage heat exchange technology, especially the technology of more than six levels has not been widely applied.

Therefore, the use of alternative raw materials containing calcium oxide with low carbon emissions can also effectively reduce the emissions in the cement production process.

Therefore, it is also necessary to make preparations in advance and look for more collaborative waste.

Generally, the industrial solid wastes available include carbide slag, blast furnace slag, steel slag and fly ash.