Guo Hongjun: Energy saving, carbon reduction and nitrogen reduction! Adopt advanced proces technology to improve that comprehensive performance of firing system

The new dry process production technology has experienced the development process from SP kiln to N-SP kiln (decomposition outside the kiln), thus realizing the substantial improvement of technical performance such as output and heat consumption. China's top 100 cement clinker production capacity list

in 2022 shows that as of December 31, 2022, there are 1598 cement clinker production lines in China. Guo Hongjun, founder of Zibo Kebang Heat Engine Technology Co., Ltd., pointed out that the process structure of more than 1500 clinker production lines in China is seriously homogeneous, and there are many similar process and technical problems:

1. The tertiary air valve of the calciner can not be fully opened; 2. that pas time of the flue gas in

the calciner is too long (more than 3.5 second), the volume output is low, but the calciner is still small;

3. the calciner has no external (re) circulation process structure, the solid-gas ratio of the calciner is low, and the volume utilization rate is not high; 4.the staged combustion designed by

taking the staged combustion of the DD and RSP furnaces as the principle does not realize that when the NOx concentration at the outlet of the decomposition furnace is reduced by 70-80%, At the same time, 3kgce/TCL is reduced, the outlet pressure of the decomposition furnace is reduced by 300-800Pa, and the output of more than 200t/d is improved;

;

6. The coal injection pipe at the kiln head does not have a flame holding cover, and many of the coal injection pipes with a flame holding cover do not exert the effect that the flame holding cover can improve the burnout rate of pulverized coal and directly reduce the coal consumption;

7. Most factories have not adopted the "normal flame calcination system" for clinker calcination, and even do not know that the use of this "calcination system" can reduce heat consumption, increase output, improve strength, change clinker granulation, improve the qualified rate of free calcium, and change the condition of kiln skin;

8. The quenching effect of most grate coolers is not good (petrographic analysis), and there are few quenching structures that can cool the clinker to the petrographic state shown in the figure below (the effect of a fourth-generation grate cooler after transformation);

9. The length-diameter ratio of the rotary kiln is much greater than 11, and the time for raw materials to reach the firing zone after entering the kiln is much greater than 5 minutes (short kiln principle), so the quality of clinker is far from the higher quality level that the raw materials used now can be calcined.

Guo Hongjun said that in order to save coal, electricity, carbon and nitrogen in the burning system, and produce the best quality clinker with the lowest energy consumption and emissions, it is necessary to solve the above problems. The "Cement Clinker Energy-saving and Nitrogen-reducing Firing Technology" listed in the "Recommended Catalogue of National Industrial Energy-saving Technology and Equipment 2019" has achieved the above problems.

"Energy-saving and nitrogen-reducing burning technology of cement clinker" is a technology with five advanced process characteristics, which can reduce coal consumption, power consumption, system resistance and NOx generation, improve clinker quality and output, and stabilize system operation. Advanced system technology to achieve CO2 emission reduction. At present, there are less than 20 production lines running in different degrees in China with

the "energy-saving and nitrogen-reducing cement clinker burning technology". This technology enables all production lines in stable operation to achieve the following technical indicators:

1. Reduce the heat consumption of the system again; 5-10 kg ce/TCL;

2. Reduce system NOx again: 50-70% (700ppm at kiln inlet);

3. Reduce power consumption again: 3-5kWh/TCL;

4. Reduce the system resistance: 500-1000 Pa (without expanding the diameter);

5. The valve of the tertiary air pipe is fully opened, and there is no ash in the pipe;

6. The clinker quenching effect is good, and the grinding time is shortened.

Guo Hongjun introduced that the technology used more than 20 utility model patents to successfully combine four foreign original technologies (decomposition furnace recycling technology, graded combustion decomposition furnace technology, low nitrogen burner with closed flame hood, longitudinal air supply fixed bed technology) into a firing system, and the technology was applied to the production. Through the original "precise balance operation technology" in China, the comprehensive performance of coal saving, electricity saving, carbon reduction and nitrogen reduction of the firing system has been improved to a higher level. On September 12-13,

2023, China Cement Network will hold the "2023 Cement'Double Carbon 'Conference and the 10th China Cement Energy Conservation and Environmental Protection Technology Exchange Conference" in Zhengzhou, Henan Province. Guo Hongjun , founder of Zibo Kebang Heat Engine Technology Co., Ltd., will share the current situation of cement clinker firing system and the application of advanced technology of energy saving and carbon reduction!

At the same time, the medal ceremony of "2023 Advanced Enterprises of Double Carbon in Cement Industry" and the "Double Carbon" Equipment Exhibition will be held . After the meeting, we will also organize a visit to the UNK4 of Jiyuan Zhonglian Cement Co., Ltd. "The world's first production line of steel slag capturing cement kiln flue gas CO2 to prepare carbon sequestration auxiliary cementitious materials and low-carbon cement". 6。 0HTML0UNK47