Cement clinker firing system carbon footprint whole-process tracking and energy-saving regulation and control method

Abstract

The invention provides a carbon footprint whole-process tracking and energy-saving regulation and control method for a cement clinker sintering system, and belongs to the technical field of cement production. According to the method, a cement firing kiln tail six-stage preheater heat exchange system is adopted for conducting waste heat recovery on kiln tail flue gas of a cement firing system, a self-denitration decomposing furnace is adopted for firing, a middle roll breaking cooling machine is adopted for cooling, and energy consumption of a fan adopted in the method is lower than a certain threshold value. The thermal insulation material adopted in the method is a low-thermal-conductivity nanometer thermal insulation material. According to the invention, the resistance loss of a preheater system is less than 5000 Pa, the C1 outlet temperature is 220-250 DEG C, the secondary air temperature is 1150-1220 DEG C, the tertiary air temperature is 950-1030 DEG C, the standard coal consumption of a sintering system is less than or equal to 93 kg / t.c1, and the comprehensive power consumption of clinker is less than or equal to 43 kWh / t.c1; the system heat consumption of a single cement production line is reduced by 5%-12%, and the carbon emission is reduced by 15-32 kg / t.c1. Compared with the prior art, energy consumption and carbon emission of the system can be remarkably reduced, and tracking of the whole process of the carbon footprint is achieved.

Description

Technical Field

[0001] This invention relates to the field of cement production technology, specifically to a method for full-process carbon footprint tracking and energy-saving control of cement clinker calcination systems. Background Technology

[0002] A cement clinker production line is an industrialized cement production system based on the new dry process. It transforms raw materials such as limestone into cement clinker through crushing, homogenization, and calcination processes. Characterized by low energy consumption and high efficiency, it is widely used in the modern cement manufacturing industry. The cement clinker calcination system is the core process system in cement production, converting raw materials into clinker through high-temperature calcination. It mainly includes raw material pretreatment, high-temperature calcination, and waste heat recovery, involving key technologies such as multi-stage preheating, decomposition, rotary kiln calcination, and cooling.

[0003] As a complete high-temperature calcination process chain, the cement clinker calcination system encompasses a comprehensive process from raw material pretreatment to clinker formation. Its core processes include the following: Raw material pretreatment: This includes crushing, homogenization, and grinding processes to process raw materials such as limestone into raw meal. Preheating and decomposition: The raw meal enters a five-stage cyclone preheater, where carbonates are pre-decomposed by high-temperature airflow, achieving an efficiency of over 90% and reducing the heat load on the rotary kiln. Rotary kiln calcination: The high-temperature airflow carries the material into the rotary kiln, where mineral recrystallization is completed at approximately 1450℃, producing clinker. Waste heat recovery: Waste heat is recovered through a cooler, reducing energy consumption and enabling cascaded power generation. Simultaneously, dust removal and denitrification devices are installed to control emissions. In recent years, the main technological innovation direction for cement clinker calcination systems has been to reduce energy consumption, decrease carbon emissions, and achieve environmental control while ensuring process quality. Currently, conventional process systems still have relatively high energy consumption, and carbon emissions have not been effectively controlled. Summary of the Invention

[0004] The technical problem to be solved by this invention is: how to further reduce the energy consumption and carbon emissions of cement clinker calcination systems, and to achieve full-process tracking of carbon footprint.

[0005] To achieve the above technical objectives, the present invention adopts the following technical solution: A method for full-process carbon footprint tracking and energy-saving control of cement clinker calcination system is proposed. In this method, a six-stage preheater heat exchange system at the kiln tail of cement calcination system is used to recover waste heat from the flue gas at the kiln tail. Calcination is carried out using a self-denitrification decomposition furnace, and cooling is carried out using a centrally located roller crusher cooler. The energy consumption of the fans used in this method is lower than a certain threshold. The heat insulation material used in this method is a low thermal conductivity nano-insulation material.

[0006] Preferably, the self-denitrification decomposition furnace improves the combustion efficiency of pulverized coal while reducing the system's harmful gas emissions.

[0007] Preferably, the harmful gas is nitrogen oxide.

[0008] Preferably, the centrally located roller crusher cooler is a fourth-generation centrally located roller crusher cooler.

[0009] Preferably, the fourth-generation central roller crusher cooler improves heat recovery of high-temperature materials and reduces cooling air volume and power consumption.

[0010] Preferably, this method employs intelligent control techniques to perform control.

[0011] Preferably, in this method, the preheater system resistance loss is <5000Pa, the C1 outlet temperature is 220~250℃, the secondary air temperature is 1150~1220℃, and the tertiary air temperature is 950~1030℃.

[0012] Preferably, in this method, the standard coal consumption of the calcination system is ≤93kg / t.c1, and the comprehensive power consumption of clinker is ≤43kWh / t.c1.

[0013] Preferably, in this method, a seven-stage preheater is used instead of the six-stage preheater; the standard coal consumption of the calcination system is ≤90kg / t.c1.

[0014] As a preferred embodiment, in this method, the system heat consumption of a single cement production line is reduced by 5% to 12%, and carbon emissions are reduced by 15 to 32 kg / t.cl.

[0015] This invention provides a method for full-process carbon footprint tracking and energy-saving control of cement clinker calcination systems. This technical solution can achieve a preheater system resistance loss of <5000Pa, a C1 outlet temperature of 220~250℃, a secondary air temperature of 1150~1220℃, a tertiary air temperature of 950~1030℃, a standard coal consumption of ≤93kg / t.c1, and a comprehensive clinker power consumption of ≤43kWh / t.c1. This invention improves the five-stage preheater to a six-stage preheater and upgrades the cooler to a fourth-generation centrally located roller crusher, thereby reducing the system heat consumption of a single cement production line by 5%~12% and carbon emissions by 15~32kg / t.c1. Compared with existing technologies, this invention can significantly reduce system energy consumption and carbon emissions, and achieve full-process carbon footprint tracking. Attached Figure Description

[0016] Figure 1 This is a technical roadmap of the method of the present invention. Detailed Implementation

[0017] The specific embodiments of the present invention will be described in detail below. To avoid excessive and unnecessary detail, well-known structures or functions will not be described in detail in the following embodiments. The approximate language used in the following embodiments is for quantitative purposes, indicating that a certain degree of variation in quantity is permissible without changing the basic function. Unless otherwise defined, the technical and scientific terms used in the following embodiments have the same meaning as commonly understood by those skilled in the art to which this invention pertains.

[0018] Methods for full-process carbon footprint tracking and energy-saving control of cement clinker calcination systems: This technology employs a six-stage preheater heat exchange system at the tail of the cement kiln to enhance waste heat recovery from the flue gas at the kiln tail of the cement firing system; a self-denitrification decomposition furnace to improve the combustion efficiency of pulverized coal while reducing NOx emissions; and a fourth-generation centrally located roller crusher cooler to improve heat recovery from high-temperature materials, reduce cooling air volume and power consumption. It also uses high-efficiency, low-energy-consumption process fans and low-thermal-conductivity nano-insulation materials as auxiliary means, combined with intelligent control methods, to significantly reduce the system's coal and power consumption.

[0019] This technology can reduce the resistance loss of the preheater system to <5000Pa, the C1 outlet temperature to 220~250℃, the secondary air temperature to 1150~1220℃, the tertiary air temperature to 950~1030℃, the standard coal consumption of the calcination system to ≤93kg / t.c1, and the comprehensive power consumption of clinker to ≤43kWh / t.c1. The standard coal consumption of the seven-stage preheater system can be further reduced by 3~4 kg / t.c1 compared to the six-stage system. By replacing the five-stage preheater with a six-stage preheater and upgrading the cooler to the fourth-generation central roller crusher, a single cement production line can reduce system heat consumption by 5%~12% and carbon emissions by 15~32kg / t.c1.

[0020] The embodiments of the present invention have been described in detail above, but the content described is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the scope of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for full-process carbon footprint tracking and energy-saving control of cement clinker calcination systems, characterized in that, In this method, a six-stage preheater heat exchange system at the tail of the cement kiln is used to recover waste heat from the flue gas at the tail of the cement kiln. The kiln is calcined using a self-denitrification decomposition furnace, and the cooling is achieved using a centrally located roller crusher cooler. The energy consumption of the fan used in this method is below a certain threshold, and the heat insulation material used in this method is a low thermal conductivity nano-insulation material.

2. The method for full-process carbon footprint tracking and energy-saving control of cement clinker calcination system according to claim 1, characterized in that, The self-denitrification decomposition furnace improves the combustion efficiency of pulverized coal while reducing the system's harmful gas emissions.

3. The method for full-process carbon footprint tracking and energy-saving control of cement clinker calcination system according to claim 2, characterized in that, The harmful gas is nitrogen oxide.

4. The method for full-process carbon footprint tracking and energy-saving control of cement clinker calcination system according to claim 1, characterized in that, The centrally located roller crusher cooler is a fourth-generation centrally located roller crusher cooler.

5. The method for full-process carbon footprint tracking and energy-saving control of cement clinker calcination system according to claim 4, characterized in that, The fourth-generation central roller crusher cooler improves heat recovery of high-temperature materials and reduces cooling air volume and power consumption.

6. The method for full-process carbon footprint tracking and energy-saving control of cement clinker calcination system according to claim 1, characterized in that, In this method, intelligent control methods are used to perform control.

7. The method for full-process carbon footprint tracking and energy-saving control of cement clinker calcination system according to claim 1, characterized in that, In this method, the preheater system resistance loss is <5000Pa, the C1 outlet temperature is 220~250℃, the secondary air temperature is 1150~1220℃, and the tertiary air temperature is 950~1030℃.

8. The method for full-process carbon footprint tracking and energy-saving control of cement clinker calcination system according to claim 1, characterized in that, In this method, the standard coal consumption of the calcination system is ≤93kg / t.c1, and the comprehensive power consumption of clinker is ≤43kWh / t.c1.

9. The method for full-process carbon footprint tracking and energy-saving control of cement clinker calcination system according to claim 1, characterized in that, In this method, a seven-stage preheater is used instead of the six-stage preheater; the standard coal consumption of the calcination system is ≤90kg / t.c1.

10. The method for full-process carbon footprint tracking and energy-saving control of cement clinker calcination system according to claim 1, characterized in that, In this method, a single cement production line reduces system heat consumption by 5% to 12% and carbon emissions by 15 to 32 kg / t.cl.

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