Recently, the Ministry of Industry and Information Technology released the third typical experience and practice case of energy efficiency "leader" enterprises in key energy-using industries in 2022: building materials industry. Huaxin Cement (Huangshi) Co., Ltd., Huaxin Jinlong Cement (Yunxian) Co., Ltd., B ole Shangfeng Cement Co., Ltd., Bazhong Conch Cement Co. The comprehensive energy consumption per unit product of clinker is 86.76 kg standard coal/ton, 89.1 kg standard coal/ton, 90.7 kg standard coal/ton and 92 respectively.
Huaxin Cement (Huangshi) Co., Ltd.
Huaxin Cement (Huangshi) Co., Ltd. has a 9500t/d clinker production line, which adopts the second-generation intelligent new dry precalcining kiln production process and is equipped with a 30MW pure low-temperature waste heat power generation system. In 2021, 3,682,600 tons of clinker and 2,418,700 tons of cement will be produced, and the comprehensive energy consumption per unit product of clinker will be 86.76 kg standard coal/ton, which is higher than benchmark level of energy efficiency. 13. The main methods are as follows:
(1) Use high-efficiency grate cooler and kiln head burner. The fourth generation grate cooler is used for clinker cooling, the heat recovery efficiency is up to 80%, and the temperature of secondary and tertiary air entering the kiln is increased. The kiln head adopts the imported multi-channel low nitrogen burner, the air consumption rate of the primary air is as low as 10%, and the temperature of the secondary air entering the kiln is increased.
Low pressure loss five-stage preheater
(1) The advanced Huaxin intelligent advanced control system is applied. Compared with the same output and quality, the heat consumption per ton of clinker was reduced by about 2 kcal, and the power consumption was reduced by about 3.
(II) Energy-saving renovation projects such as motor frequency conversion were implemented. Energy-saving technical renovation projects such as high-efficiency fan renovation of raw mill circulating fan, high-efficiency fan renovation of kiln tail exhaust fan, frequency conversion renovation of air compressor and centralized automation control renovation, frequency conversion renovation of equipme NT driving motor, high-efficiency energy-saving motor replacing ordinary motor, etc. Annual power saving 1449.
(1) Coal-fired slag is used as fuel. Coal-fired slag and raw materials will be mixed into the furnace in an appropriate proportion to provide a certain amount of heat for the calcination process of semi-finished clinker products. In 2021, 58,400 tons of coal-fired slag will be used to save 9952 standard coal.
(2) Energy-saving technical transformation of preheater, fan and kiln burner will be implemented. The preheater system and the smoke chamber at the kiln end were reformed to save 10800 tons of standard coal. Circulating fans and tail exhaust fans were replaced by high-efficiency fans, saving 7818 tons of standard coal. The original three-channel kiln head burner is replaced by a four-channel low nitrogen kiln head burner to improve the burnout rate and combustion speed of pulverized coal. Refractory bricks in the rotary kiln and high-alumina anti-skinning materials in the preheater are replaced by silicon-mullite red bricks.
Fan high-voltage frequency converter
4. Bazhong Conch Cement Co., Ltd
. Bazhong Conch Cement Co., Ltd. has a 4500 tons/day new dry process cement clinker production line, supporting 9 MW pure low-temperature waste heat power generation system. In 2021, 1.9283 million tons of clinker and 2.0619 million tons of cement will be produced, and the comprehensive energy consumption per unit product of clinker will be 92.08 kg of standard coal/ton, which is higher than benchmark level of energy efficiency. 7. The main measures are as follows:
(1) Implement the transformation of replacing electric dust removal with bag dust removal. Electric dust collection at kiln head and kiln tail is changed to bag dust collection, the concentration of flue gas emission is reduced to 10 mg/m3, and the comprehensive power consumption per unit product of clinker is reduced by 2 kWh/ton. Reduce the height of the material retaining ring of the raw material mill, reduce the internal circulation of the mill by lowering the material layer by 6, improve the grinding capacity, and reduce the power consumption of the raw material grinding process. 1.
(2) Co-disposal of municipal solid waste. The project of co-disposal of municipal solid waste in cement kilns has been completed, and the waste gas from waste incineration can be disposed of in cement kilns, which can save 10000 tons of standard coal annually.
Co-processing of municipal solid waste
in cement kilns < IMG SRC = "Establish an automatic electric energy acquisition system and an online energy monitoring platform https://img7.ccement.com/richtext/img/dkwi4kur1681679015654069." In 2021, intelligent systems such as expert optimization operating system, cement automatic bag inserting machine and automatic loading machine will be implemented.
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