Recently, Tao Congxi, chief expert of China Resources Building Materials Technology Holdings Co., Ltd., shared the "3C" carbon neutralization technology and practical exploration of cement industry at the "2024 13th China Cement Industry Summit Main Forum and TOP100 Award Ceremony" held by China Cement Network.
< IMG SRC = "Carbon Emissions
of https://img7.ccement.com/richtext/img/2abse3d87o81711624968123.1
and Cement Industry In recent years, China has pledged to achieve carbon peak by 2030 and carbon neutrality by 2060, and has formulated a series of policies from the central government to the local government. China's cement carbon emission reduction is imminent! In the past ten years, it has fluctuated between 2.2 billion and 2.4 billion tons and entered a plateau period. China's cement industry has entered a plateau period. With the arrival of national carbon neutralization, the future cement supply will gradually decline and enter the era of green low-carbon economy.
< IMG SRC = "https://img7.ccement.com/richtext/img/y3mlkrg4zge1712124035403. National Development and Reform Commission Requirements" China's Cement Industry Energy Efficiency Benchmark Level in 2025 < a Href = "https://price.ccement.com/Price_list-1-s0-e0-p0-c0-k100059-b0. that in 2020, only 5% of the cement industry's capacity will be energy efficient above benchmark levels.". In 2022, the cement industry will emit about 13 CO2. Therefore, it is urgent to reduce carbon emissions in China's cement industry.
2、 of domestic and international carbon emission reduction technology path
International technology path:
from the European Cement Association: 2050 cement industry carbon neutral road-based on the carbon reduction technology route of the whole industry chain. In 2030, the carbon reduction of clinker is 61 kg; the carbon reduction of cement is 35 kg; the carbon reduction of concrete is 28 kg; the carbon reduction of building is 71 kg. In 2050, the carbon reduction will be 160 kg for clinker, 117 kg for cement, 59 kg for concrete and 51 kg for buildings. IEA (
International Energy Agency) requires 2050 low-carbon road map for cement industry, which is based on carbon reduction technology route of cement process. Improve cement production efficiency and energy efficiency, reduce carbon by about 3%; alternative fuel technology (co-processing, etc.), reduce carbon by about 12%; reduce clinker coefficient (admixture instead of clinker), reduce carbon by about 37%; carbon capture and utilization technology, reduce carbon by 13% in 2030, and ultimately reduce carbon by 48%.
< IMG SRC = "https://img7.ccement.com/richtext/img/g3r5l1o0bir1712124054810.2020-2030
through energy efficiency, Use alternative fuel raw materials and new binders to reduce the carbon emission intensity of clinker; reduce the carbon emission intensity of cement and concrete by using clinker with low carbon emission, optimizing the proportion of concrete and new cement types; At the same time, the carbon capture and utilization project (CCUS) is used to integrate carbon dioxide capture, recarbonization of recycled concrete, use of carbon dioxide in circular economy and promotion of new technologies on an industrial scale. Continue to improve energy efficiency, replace cement materials, increase low-carbon/zero-carbon products, use hydrogen as fuel and kiln electrification, and support long-term research and development of new technologies
in 2030-2050. Finally, achieve carbon neutrality in 2050.
The domestic technology path is based on the idea of carbon reduction under the high output of cement in China. According to the model deduction, in order to achieve carbon neutrality in China's cement industry by 2060, the cement output should be controlled at 7.
The general idea is: source control + carbon emission reduction + end capture
raw material: reducing limestone consumption; preparation of low-carbon cementitious material
fuel: alternative fuel; Energy saving and carbon reduction of clean fuel alternative coal
production system: energy efficiency improvement
of process and equipment, efficient utilization of cement (concrete): cement grinding aid, reduction of cement consumption in concrete, extension of service life; CO2 Capture and Utilization of Carbon Sequestration Concrete Products
: Capture, Purification and Efficient Utilization of
Carbon Emission Market: Establishment of Evaluation System (Standard) and Carbon Sink (Trading)
It was found in the benchmarking of cement energy consumption between China and the world. Based on the technical status quo, the space for further improvement of energy efficiency is limited, which has reached the world advanced level; the clinker coefficient is better than the international target value, and the space for substantial carbon reduction is "limited". We will encourage the development of alternative fuel technologies and equipment to reduce carbon emissions from energy consumption! We will encourage the development of new energy technologies and equipment and reduce carbon emissions from the energy structure! Encourage the development of low-carbon cement concrete technology to reduce carbon emissions from materials and applications! The theoretical system is in line with the cement production mine, cement clinker burning system, grinding system, concrete and other industrial chain links, and formulates the technical route of energy saving and carbon reduction to solve the problem of carbon reduction in the industry.
are as follows: (836 kg based on advanced production line) Based on CO2 /t. Cl)
< IMG SRC = "https://img7.ccement.com/richtext/img/tj3tw20ly691712124150468. granite sludge and leftover materials contain a certain amount of resin, which can be used for batching after pretreatment to improve the grindability of raw meal, thereby reducing the grinding power consumption and batching cost.". 12.
Technical route-2: Development and application of wet coal cinder as low calorific value raw meal. The wet coal cinder has the properties of high alumina and low silica, which can be used as raw material for sialic correction after pretreatment to improve the activity of raw meal. The preparation technology of low energy consumption cement raw meal is developed by using the calorific value of coal cinder and the crystal nucleus effect of coal cinder in the process of clinker formation, which is beneficial to promote the formation of clinker minerals.
Relying on the one-stop co-disposal project of multiple solid wastes, Huarun Cement declared "Key Technologies and Applications of Industrial Solid Waste Preparation of High-quality Cementitious Materials" and won the first prize of Guangxi Science and Technology Progress in 2021.
Raw Material Substitution Case 2: Waste Residue Utilization
China Resources JS: Starting from cement raw materials, taking yellow phosphorus slag and carbide slag as examples, the carbon emission reduction scheme of cement industry is studied to directly reduce carbon emission sources. After the utilization of waste slag, the standard coal consumption of clinker in 2020 will be reduced by 13.78 kgce/t. Sh compared with that in 2015. At present, the standard coal consumption of the system is less than 80kg.ce/t.
Case 1 of fuel substitution: technical route of co-disposal
of municipal sludge: co-disposal of "drying in sewage treatment plant + incineration in cement kiln". After the sludge is dried and reduced, the sludge is incinerated in a cement kiln, so that the land for landfill is greatly saved; no ash is discharged, so that the 100% reduction disposal of minerals and organic matters is realized; heavy metals are stably solidified in cement clinker minerals; the high-temperature incineration realizes the full digestion of organic pollutants; and the waste water and waste gas treatment process is configured, so that the zero emission of pollutants is realized.
Fuel Substitution Case 2: Co-disposal
of Urban and Rural Domestic Waste China Resources Building Materials Technology has never stopped
exploring co-disposal < IMG SRC = "https://img7.ccement.com/richtext/img/1heqrs8vdcqj1712124178144.
Fuel Substitution Case 3: Light Solid Waste.". Surrounding resources are utilized, and multiple light solid wastes such as waste rags, barks and fuel rods are selected as alternative fuels.
New Energy Case 1: Construction of Green Renewable Energy
Solar Energy and Wind Energy Zero Power Purchase Project: The best operation mode of the zero power purchase project is "self-generation and self-use, and the surplus electricity is connected to the grid". Take the 6000tpd project as an example: photovoltaic power generation: the photovoltaic power generation area is 67049 m2; the annual average power generation in 25 years is 8986 MWh. Wind power generation: 10 sets of wind turbines; annual average power generation in 20 years: 93,593 MWh. Total power generation: MWh 102579. Among them, 70% of the self-use power supply and the remaining 30% of the surplus power generation are connected to the grid. Total investment: 331.08 million yuan; investment recovery period: about 11 years.
New Energy Case 2: Green Ammonia Fuel Replaces Coal
in Cement Production Line Green ammonia fuel has been applied to the 5,000-ton clinker production line of Donghua Cement in Zibo, Shandong Province as an alternative fuel for cement production. The first phase of the project has achieved 6% coal substitution, while reducing nitrogen oxides produced in cement production to less than 50 mg, and the second phase has achieved 20% coal substitution.
New Energy Case 3: Hydrogen Energy Replaces Coal
in Cement Production Line Hydrogen Energy (Part) Replaces Pulverized Coal: About 21 kg H2 is consumed per ton of clinker. Taking 5,000 TPD clinker production line as an example, about 370,000 tons of carbon emissions can be reduced annually; The UK ETP Clean Energy Technology Guide will test the use of alternative fuels such as hydrogen in Tarmac and Hanson Cement.
(2) Process carbon reduction practice case
Process carbon reduction technology path analysis focuses on the application effect of "3C" process carbon reduction from three aspects: the optimization of production process and technical equipment of burning system and grinding system, and the research and development of cement emission reduction grinding AIDS.
