Recently, Foshan Ruitaoda Ceramic Machinery Equipment Co., Ltd. (hereinafter referred to as Ruitaoda) independently developed the "R & D and Application of Ceramic Roller Kiln Hot Air Pressurization Combustion Support Technology" project successfully passed by the Foshan Science and Technology Bureau. Appraisal of scientific and technological achievements. After expert group appraisal, it is believed that the project achieves a comprehensive energy saving of the kiln of 20%, reaching the domestic leading level.

The expert group for this appraisal meeting was composed of Professor Zeng Lingke from South China University of Technology, Dong Kaijun, a professor-level senior engineer at the Guangzhou Institute of Energy Research, Chinese Academy of Sciences, Gao Yue, vice president of energy efficiency test researcher of Foshan Special Equipment, Gong Yue, and Kong Haifa, senior engineer of Foshan Ceramic Society Huang Xiran, a senior engineer of Foshan Ceramic Industry Association, Lu Dunmu, a senior engineer of Guangdong Silicate Society, and Ye Shulin, a professor from Foshan Institute of Science and Technology, are composed of seven experts.

At the meeting, the appraisal committee with Zeng Lingke as the director heard a detailed introduction of the relevant person in charge of Ruitao Da to the "R & D and application of hot air booster combustion technology for ceramic roller kiln". After reviewing relevant documents, a series of replies, expert questions and intense discussions, the experts finally made an objective and fair evaluation of the project. Experts of the appraisal committee unanimously passed the appraisal of the project and believed that: to achieve a comprehensive energy saving of 20% in the kiln and improve the firing quality of the product, the project has obtained 2 utility model patents and reached the domestic leading level; the project products have been used by users. The response is good, with significant economic and social benefits, and it is recommended to promote the application in the industry.

It is understood that this project was formally established in March 2011, and the successful completion of R & D was March 2012, with a total investment of 3 million yuan. The successful research and development of the project has achieved the expected results, achieved energy saving and emission reduction, and brought huge economic and environmental benefits. At the same time, the project has obtained two utility model patents, realizing the company's strategic intention of technological innovation.

Three major innovations reach domestic leading level

At present, domestic and foreign kiln waste heat has achieved successful experience. The kiln waste heat has been used in two parts: high temperature flue gas and cooling hot air. The first part, high temperature flue gas, is mainly used in the dryer, or it is used in the spray tower for spray drying; the second part, cooling hot air, there are three main ways of utilization: one is used on the dryer, the other is It is used as combustion-supporting air for kiln. The third is to use the waste heat from the dryer to the spray tower. The use of kiln cooling hot air and hot flue gas can basically meet the zero fuel consumption of the green body drying. Ruitaoda independently develops hot air booster combustion technology, which can circulate the hot air inside the kiln and reduce the loss of hot air.

According to the appraisal report, Ruitaoda uses independent intellectual property rights technology, through the comprehensive application of combustion air boosting technology, brick blank waste heat recovery technology, and dual automatic control combustion technology, to reduce the temperature difference in the cross section of the kiln, improve the combustion efficiency of the burner, and strengthen the waste heat Recycling, reducing the temperature of the green body out of the kiln, reducing the distribution of combustion air, and improving the complete degree of combustion. According to reports, Ruitaoda's "Ceramic Roller Kiln Hot Air Pressurization Combustion Support Technology Development and Application" project has three key technologies. The first is the innovation of combustion assist hot air booster technology, and the second is the innovation of brick heat recovery technology. The third is the innovation of dual automatic combustion technology.

First of all, the combustion-supporting hot air supercharging technology uses the self-developed FS-211X burner to use high-temperature hot air above 300 ° C after quenching the kiln as the combustion-supporting air to reduce the local temperature difference in the kiln and achieve full utilization of waste heat. Secondly, the technology of residual heat recovery of brick blanks enables the heat exchange between air and brick blanks through the self-innovated cross-section circulation stirring air curtain, so that the temperature of the product exiting the kiln is controlled below 200 ° C (currently the temperature of the brick exiting roller kiln reaches 250 ~ 300 ° C) , The use of waste heat in this field is still blank in the industry), the waste heat is further used while reducing the product's later deformation and improving the professional environment. Third, the dual-automatic combustion technology detects the kiln atmosphere online, and controls the air distribution according to the CO concentration in the flue gas, so that the temperature and atmosphere can be automatically controlled at the same time (at present, the kiln only has temperature automatic control).

Comprehensive energy saving up to 20%

The appraisal report pointed out that the use of ceramic roller kiln hot air booster combustion technology to achieve a comprehensive energy saving of the kiln up to 20% and improve the product firing quality.

Liang Xinuan, general manager of Foshan Ruitaoda Ceramic Machinery Equipment Co., Ltd. once told reporters: "Hot air assisted combustion reduces positive pressure in the kiln and slows down the vertical flow, which can give full play to the heat and reduce the temperature difference between the locations inside the kiln. The biggest breakthrough is to change the original firing curve, reducing the maximum temperature zone by more than 30 degrees Celsius, which can reduce energy consumption by 10% to 15%, and can save energy consumption by at least 20%. "At the appraisal meeting, according to user use The data show that the use of ceramic roller kiln hot air booster combustion technology makes the temperature difference in the same cross section of the kiln less, has little effect on the color and quality of the calcined product, and the product quality has been improved.

In addition, the appraisal report stated that the product of the project was tested by the Guangzhou Energy Inspection and Research Institute in accordance with GB / T23459-2009 "Measurement and Calculation Method of Thermal Balance and Thermal Efficiency of Ceramic Kiln Industrial Kilns", and the thermal efficiency of the kiln was improved by 15.87% after the transformation. This means that the kiln can reduce the amount of gas fuel required for kiln combustion after implementing hot air boost combustion technology.

According to statistics, according to the calculation of 3,600 kilns nationwide, if 20% of the ceramic kilns can adopt hot-air pressurization and combustion-supporting technology, the country will save about 2.4 million tons of coal per year. At the same time, it indirectly reduces SO2 emissions for enterprises and brings huge economic and environmental benefits to society.

Close to the main theme of energy saving and environmental protection

At the appraisal meeting, Foshan City Specialist Energy Efficiency Test Researcher Senior Engineer and Deputy Dean Gong Yue highly praised Ruitaoda's project. She said: "This project has a good effect on the energy saving of ceramic enterprises. The ceramic enterprises have done a lot of energy saving and emission reduction work during the" Eleventh Five-Year Plan "period. If the hot air booster combustion technology of ceramic roller kilns is used in ceramic enterprises, Energy savings of 20% to 30% have a boosting effect on energy saving and emission reduction of ceramic enterprises. "

The hot air pressurized combustion-supporting technology of ceramic roller kiln independently researched and developed by Ruitao not only improves the complete degree of combustion, but also improves the calcination quality of the product. In addition, through the renovation of the equipment of the Ruitaoda kiln, the waste heat energy in the cold room is utilized, and the waste heat of the kiln is fully utilized to further reduce the later deformation of the product. The modified kiln can not only reduce the amount of gas fuel required for kiln combustion, but also reduce SO2 emissions. The application of the hot air pressurization and combustion-supporting technology of the ceramic roller kiln has realized energy saving and emission reduction, which not only brings economic and environmental benefits, but also improves the living environment of human society.

Ceramic companies have always faced many unfavorable policies, and the ceramic industry has been classified as a high energy consumption and high pollution industry. In 2011, the Ministry of Industry and Information Technology officially issued the "Twelfth Five-Year Development Plan for the Building Materials Industry" and the "Twelfth Five-Year" Development Plans for five building material sub-sectors such as cement and ceramics. This shows that energy saving and emission reduction is a breakthrough and an important starting point for China to adjust its economic structure and transform its development mode. The main way to save energy and reduce emissions is to use science and technology as a means to constantly explore the production process and promote the transformation of production technology. The emergence of hot air pressurization and combustion-supporting technology for ceramic roller kilns has become an important breakthrough in energy conservation and emission reduction in the ceramic industry.

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