Bamboo charcoal modified material for improving cement ingredients
By replacing coal with bamboo charcoal made of mosaic bamboo slices and mosaic bamboo powder, cement ingredients are improved, and the problems of high energy consumption, high emissions and low-grade limestone resource utilization in cement production are solved, and the effect of reducing carbon emissions and improving resource utilization is achieved.
Patent Information
- Application Number
- CN202510388117.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-31
- Publication Date
- 2025-06-27
AI Technical Summary
There are problems of high energy consumption and high emissions in the existing cement production process, and the utilization rate of low-grade limestone resources is low, resulting in environmental pollution and waste of resources.
Bamboo charcoal modified materials made of mosaic bamboo slices and mosaic bamboo powder are used to form bamboo charcoal through thermal cracking process, and use it to replace coal and improve cement ingredients.
It reduces the carbon emission intensity of cement production, improves the utilization rate of cement production raw materials, optimizes cement quality, and slows down environmental pollution and resource waste.
Smart Images
Figure CN120208565A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of building materials, and particularly relates to a bamboo charcoal modified material for improving cement batching. Background Art
[0002] The cement industry, as an important pillar of the global economy, provides indispensable raw materials for the construction industry and plays a crucial role in the development of the national economy.
[0003] However, while the cement industry is developing rapidly, it also faces a series of severe technical problems. First of all, the cement industry is a typical high-energy-consuming and high-emission industry, and the problems of environmental pollution and resource consumption are becoming increasingly prominent. The traditional cement production method mainly relies on fossil fuels such as coal, heavy oil, and natural gas. As a major cement-producing country in China, bituminous coal is mainly used in combination with some anthracite, which not only increases the carbon emission intensity but also causes serious environmental pollution problems.
[0004] Secondly, although the use of high-quality coal in combination with limestone mines can improve the quality of cement to a certain extent, the large use of coal also restricts the effective utilization of low-grade limestone. Cement production has a high dependence on limestone resources. With the rapid expansion of production capacity, high-quality limestone resources are becoming increasingly scarce. Low-grade limestone has complex components and contains harmful components such as Mg2+, Na+, K+, and Cl-. Once the content of these harmful components exceeds the standard, it will seriously affect the quality of cement clinker, resulting in low utilization rate of cement mines and a serious "mineral pressure" phenomenon, further exacerbating resource waste and environmental pressure. Summary of the Invention
[0005] The purpose of the present invention is to provide a bamboo charcoal modified material for improving cement batching to solve the problems of poor quality of existing cement, increased carbon emission intensity, reduced utilization rate of cement production raw materials, and serious environmental pollution.
[0006] A bamboo charcoal modified material for improving cement batching includes bamboo charcoal made from biomass raw materials. The biomass raw materials consist of bamboo slices and bamboo powder. The bamboo slices serve as the main raw material for biomass pyrolysis, and a certain proportion of bamboo powder serves as a pyrolysis additive.
[0007] Preferably, the cross-sectional thickness of the bamboo slices is 10 mm, the length is less than 50 mm, and the particle size of the bamboo powder is less than 1 mm.
[0008] Preferably, the processing process of the bamboo charcoal is as follows:
[0009] Step 1: Slicing, crushing the bamboo biomass into slices to reach the required specifications.
[0010] Step 2: Drying. Dry the moisture of the bamboo slices through a drying system.
[0011] Step 3: Mixing. Mix the dried bamboo slices and bamboo powder in a certain mass ratio.
[0012] Step 4: Pyrolysis. Transport the well - mixed bamboo slices and bamboo powder into a rotary kiln pyrolysis system through a belt. Under certain temperature and residence time conditions, pyrolyze the bamboo slices and bamboo powder to form poplar charcoal.
[0013] Step 5: Water cooling. Conduct water - cooling treatment on the poplar charcoal to form bamboo charcoal.
[0014] Preferably, the drying system in Step 2 needs to dry the moisture of the bamboo slices to less than 15% to ensure that the water content of the bamboo slices entering the pyrolysis furnace is less than 15%, and the water content of the bamboo powder is less than 5%.
[0015] Preferably, the mass mixing ratio of the bamboo slices to the bamboo powder in Step 3 is 1:1.
[0016] Preferably, the mixing method in Step 3 is to mechanically mix equal amounts of bamboo powder and dried bamboo slices, stir and mix evenly so that the bamboo slices are evenly coated with bamboo powder.
[0017] Preferably, the pyrolysis atmosphere in Step 4 adopts nitrogen or an oxygen - free environment.
[0018] Preferably, the heating rate of pyrolysis in Step 4 is 10 ° / min, the final pyrolysis temperature range is 240 °C to 270 °C, the pyrolysis residence time is 15 min, the carbon yield on dry basis of pyrolysis is 41.5% to 77.5%, and the high calorific value on air - dry basis is 5100 kcal / kg to 6400 kcal / kg.
[0019] Preferably, the main technical index range of the bamboo charcoal modification material is controlled as follows: internal water ≤ 3%, ash content ≤ 5%, volatile matter ≤ 50%, fixed carbon ≥ 42%, calorific value on air - dry basis ≥ 23 MJ / / kg, and in the ash component, R2O ≤ 15%, MgO ≤ 10%.
[0020] The advantages of the present invention are as follows: In the present invention, a bamboo charcoal modified material for improving cement batching uses bamboo chips and bamboo powder to make bamboo charcoal, replacing coal. As the proportion of bamboo charcoal replacing coal increases, the carbon emission intensity of cement production is reduced. At the same time, due to its characteristics of low ash, low aluminum content, and high calorific value, the proportion of ash settlement incorporated into the batching gradually decreases. While maintaining the same three modulus values of the clinker leaving the cement kiln, as the proportion of biomass charcoal used increases, the CaO content of the limestone used for batching and related control indicators are all optimized. The bamboo charcoal modified material has an obvious improvement effect on cement batching, optimizes the quality of cement, reduces the carbon emission intensity during the production process, improves the utilization rate of cement production raw materials, and alleviates the waste of resources and environmental pressure. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] Figure 1 It is a process flow diagram of bamboo charcoal production in the present invention.
[0022] Figure 2 It is a bar chart showing the influence of the final temperature of pyrolysis on the pyrolysis characteristics of the mixture of bamboo chips and bamboo powder in the present invention.
[0023] Figure 3 It is a table showing the change of CaO content of limestone for batching in the present invention.
[0024] Figure 4 It is a table showing the change of CaO content of raw meal limestone in the present invention.
[0025] Figure 5 It is a table showing the change of the proportion of ash settlement incorporated into the batching in the present invention.
[0026] Figure 6 It is a table showing the change of alkali content in the clinker in the present invention.
[0027] Figure 7 It is a table showing the change of chloride ion content in the clinker in the present invention.
[0028] Figure 8 It is a schematic diagram of the bamboo charcoal production device in the present invention. DETAILED DESCRIPTION OF THE INVENTION
[0029] To make the technical means, creative features, achieved purposes, and functions of the present invention easy to understand, the present invention will be further described below in conjunction with specific embodiments.
[0030] As Figures 1 to 8 shown, a bamboo charcoal modified material for improving cement batching includes bamboo charcoal made from biomass raw materials. The biomass raw materials consist of bamboo chips and bamboo powder. The bamboo chips serve as the main raw material for biomass pyrolysis, and a certain proportion of bamboo powder serves as a pyrolysis additive.
[0031] In this embodiment, the cross-sectional thickness of the bamboo slices is 10 mm, the length is less than 50 mm, and the particle size of the bamboo powder is less than 1 mm.
[0032] In this embodiment, the processing flow of the bamboo charcoal is as follows:
[0033] Step 1: Slicing, crushing the bamboo biomass into slices to reach the required specifications.
[0034] Step 2: Drying, drying the moisture of the bamboo slices through a drying system.
[0035] Step 3: Mixing, mixing the dried bamboo slices and bamboo powder in a certain mass ratio.
[0036] Step 4: Pyrolysis, transporting the fully mixed bamboo slices and bamboo powder into a rotary kiln pyrolysis system through a conveyor belt. Under certain temperature and residence time conditions, the bamboo slices and bamboo powder are pyrolyzed to form poplar charcoal.
[0037] Step 5: Water cooling, performing water cooling treatment on the poplar charcoal to form bamboo charcoal.
[0038] In this embodiment, the drying system in Step 2 needs to dry the moisture of the bamboo slices to less than 15% to ensure that the moisture content of the bamboo slices entering the pyrolysis furnace is less than 15%, and the moisture content of the bamboo powder is less than 5%.
[0039] In this embodiment, the mass mixing ratio of the bamboo slices to the bamboo powder in Step 3 is 1:1. The mixing method is to mechanically mix equal amounts of bamboo powder and dried bamboo slices, stir and mix evenly so that the bamboo slices are evenly coated with bamboo powder.
[0040] In this embodiment, the pyrolysis atmosphere in Step 4 uses nitrogen or an anaerobic environment.
[0041] In this embodiment, the heating rate of the pyrolysis is 10 ° / min, the optimal final pyrolysis temperature is 250 °C, the pyrolysis residence time is 15 min, the optimal pyrolysis dry basis carbon yield is 77.5%, and the optimal air-dried basis higher calorific value is 5431 kcal / kg.
[0042] In this embodiment, the main technical index range of the bamboo charcoal modification material is controlled within: internal water ≤ 3%, ash content ≤ 5%, volatile matter ≤ 50%, fixed carbon ≥ 42%, air-dried basis calorific value ≥ 23 MJ / / kg, where in the ash composition, R2O ≤ 15%, MgO ≤ 10%.
[0043] In this embodiment, the bamboo charcoal and cement limestone raw material batching adopts the method of directly replacing coal. After being ground and mixed by the original coal powder grinding system, it directly enters the cement firing system, so as to provide the heat environment required for the reaction while batching. Taking a certain cement production line as an example, the theoretical batching calculations are carried out with the replacement ratios of bamboo charcoal modified materials for coal being 0%, 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, and 100% respectively, and the changes in the CaO content of limestone for batching, the CaO content of raw meal, the incorporation ratio of ash sedimentation into batching, the alkali content in clinker, and the chloride ion content in clinker are demonstrated on the premise that the target values of the three modulus values of clinker out of the cement kiln remain consistent.
[0044] When the bamboo charcoal replaces coal by 0% - 100%, the contents of lime saturation coefficient (KH), silica modulus (SM), and aluminum modulus (IM) of the cement clinker are measured respectively and recorded in the following table:
[0045]
[0046] In the national standard for cement quality, the required range of KH is usually between 0.82 and 0.96, the required range of SM is usually between 1.5 and 3.5, and the required range of IM is usually between 0.64 and 3.0. From the above table, it can be seen that when the bamboo charcoal replaces coal by 0% - 100%, the three modulus values of the clinker out of the cement kiln all meet the national standard for cement quality requirements.
[0047] As Figure 3 shown, when the bamboo charcoal replaces coal by 0% - 100%, the allowable CaO content of limestone for batching drops from 48.05% to 44.5%, and the CaO content of limestone drops by 3.55%.
[0048] As Figure 4 shown, when the biomass charcoal replaces the same coal by 0% - 100%, the CaO content of raw meal drops from 44.15% to 42.79%, and the CaO content of raw meal drops by 1.36%.
[0049] As Figure 5 shown, when the bamboo charcoal replaces coal by 0% - 100%, the incorporation ratio of ash sedimentation into batching drops from 3.7% to 0.6%, and the incorporation ratio of ash sedimentation into batching drops by 3.1%.
[0050] As Figure 6 shown, when the bamboo charcoal replaces coal by 0% - 100%, the alkali content in the cement clinker rises from 0.80% to a maximum of 1.09%. When the replacement ratio exceeds 50%, the alkali content in the clinker is basically stable at about 1.00%. Due to the decrease in the grade of limestone, the alkali content in limestone rises, but the ash content decreases, and the alkali content in the clinker basically reaches stability.
[0051] AsFigure 7 As shown, when the bamboo charcoal replaces 0%-100% of the coal, the chloride ion content in the cement clinker gradually decreases from 0.014% to 0.008%, mainly due to the decrease in the proportion of coal ash sediment incorporated into the batching.
[0052] In summary, as the proportion of bamboo charcoal replacing coal increases, the carbon emission intensity of cement production is reduced by more than 15%. Affected by its characteristics of low ash, low aluminum content, and high calorific value, the proportion of ash sediment incorporated into the batching gradually decreases. When the proportion of biomass charcoal reaches 100% while maintaining the same three modulus values of the clinker leaving the cement kiln, the CaO content of the allowable batching limestone and related control indicators are all optimized. The bamboo charcoal modified material has an obvious improvement effect on the cement batching, optimizes the cement quality, reduces the carbon emission intensity during the production process, and improves the utilization rate of the raw materials for cement production.
[0053] As is known by technical common sense, the present invention can be implemented by other embodiments that do not depart from its spiritual essence or essential features. Therefore, the above-disclosed embodiments are illustrative in all aspects and not exclusive. All changes within the scope of the present invention or within the scope equivalent to the present invention are encompassed by the present invention.
Claims
1. A bamboo charcoal modified material for improving cement batching, characterized in that: The invention comprises bamboo charcoal made from biomass raw materials, wherein the biomass raw materials are composed of bamboo slices and bamboo powder, the bamboo slices are used as the main raw materials for biomass thermal cracking, and a certain proportion of bamboo powder is used as a thermal cracking additive.
2. The bamboo charcoal modified material for improving cement batching according to claim 1, characterized in that: The cross-sectional thickness of the bamboo slice is 10 mm, the length is less than 50 mm, and the particle size of the bamboo powder is less than 1 mm.
3. The bamboo charcoal modified material for improving cement batching according to claim 2, characterized in that: The processing flow of the bamboo charcoal is as follows: Step 1: Slice and break the bamboo biomass into pieces to the required size; Step 2: Drying: Drying the moisture of the bamboo slices through a drying system; Step 3: Mixing: Mixing the dried bamboo chips and bamboo powder in a certain mass ratio; Step 4: Pyrolysis: The fully mixed bamboo chips and bamboo powder are transported into the rotary kiln pyrolysis system through a belt, and under certain temperature and residence time conditions, the bamboo chips and bamboo powder are pyrolyzed to form poplar charcoal; Step 5: Water cooling: water cooling the poplar charcoal to form bamboo charcoal.
4. The bamboo charcoal modified material for improving cement batching according to claim 3, characterized in that: The drying system in step 2 needs to dry the moisture content of the bamboo chips to less than 15% to ensure that the moisture content of the bamboo chips entering the pyrolysis furnace is less than 15%, wherein the moisture content of the bamboo powder is less than 5%.
5. The bamboo charcoal modified material for improving cement batching according to claim 3, characterized in that: In the step three, the mass mixing ratio of the bamboo chips to the bamboo powder is 1:
1.
6. The bamboo charcoal modified material for improving cement batching according to claim 5, characterized in that: The mixing method in step three is to mechanically mix equal amounts of bamboo powder and dried bamboo chips, and stir and mix them evenly so that the bamboo chips are evenly coated with the bamboo powder.
7. The bamboo charcoal modified material for improving cement batching according to claim 3, characterized in that: In step 4, the thermal cracking atmosphere is nitrogen or an oxygen-free environment.
8. The bamboo charcoal modified material for improving cement batching according to claim 7, characterized in that: The heating rate of the thermal cracking in step 4 is 10° / min, the final temperature range of the thermal cracking is 240°C to 270°C, the thermal cracking residence time is 15min, the char yield on a dry basis of the thermal cracking is 41.5% to 77.5%, and the higher calorific value on an air-dry basis is 5100kcal / kg to 6400kcal / kg.
9. The bamboo charcoal modified material for improving cement batching according to claim 1, characterized in that: The main technical index ranges of the bamboo charcoal modified material are controlled within the range of internal water ≤3%, ash ≤5%, volatile matter ≤50%, fixed carbon ≥42%, air-dried basis calorific value ≥23MJ / / kg, wherein R2O ≤15% and MgO ≤10% in the ash component.