As the country's efforts in environmental protection continue to increase, various regions across the country have gradually introduced corresponding countermeasures. The treatment of coal-fired boilers is one of the measures. For the wallpaper industry, most of the early heating methods of the equipment used coal-fired boilers to heat the heat-conducting oil, and the hot air was heated by a heat exchanger to dry and foam the wallpaper. In order to solve the problem of coal-fired boiler pollution, the company where the author is located - Xi'an Yujie Electromechanical Equipment Co., Ltd. has introduced a natural gas direct-fired heating device, which adds a direct-fired heating system to each printing drying oven and foaming oven. heat. In the past year, Xi'an Jiejie has transformed more than 500 heating points for customers in Beijing, Zhejiang, Jiangsu and Hebei. In order to better optimize the performance of the heating system, the author and the company's R&D team passed the test and adjustment continuously, and launched the industry standard for the first time in China - 50mg/m 3 (national standard 200 mg/m 3 ). Below, the author will analyze the concerns of natural gas direct combustion heating around this new standard for readers:
1. What is 50mg/m 3 ?
The main component of natural gas is CH 4 , methane, and its full combustion chemical formula is as follows:
CH 4 +2O 2 =CO 2 +2H 2 O
It can be seen from the above formula that after the methane is fully burned, its products are carbon dioxide and water, and the discharge does not pollute the atmosphere, which is why it is environmentally friendly. However, in the case of insufficient combustion, its combustion chemical formula is as follows:
2CH 4 +3O 2 =2CO+4H 2 O
It can be seen from the above formula that carbon monoxide and water are produced in the case of insufficient combustion. In this case, it will lead to two problems: First, the gas is not fully decomposed, resulting in waste of energy; second, carbon monoxide itself is a toxic and harmful gas, causing great harm to the human body. Therefore, the CO content of the hot gas becomes a direct parameter for determining whether the entire combustion system is reasonable.
The meaning of 50mg/m 3 is that the carbon monoxide content is 50mg per 1m3 of gas discharged through the exhaust fan, and the national vehicle exhaust emission standard is 50mg/m 3 . The exhaust standard of the company's hot air system is very high.
2. What is the relationship between the CO content and the combustion system?
The production of CO is mainly related to the selection and commissioning of the burner and the valve group, and the structural design of the combustion chamber. First, the choice of the burner and the related valve group is the first step, because the burners and valve groups sold in the market are mixed. How to combine a set of burners suitable for wallpaper equipment conditions is critical, because it is directly related to the safety of the combustion process, natural gas combustion adequacy.
Second, the structural design of the combustion chamber is also critical. Natural gas and air pass through different pipelines, mix on the steady flame plate of the burner, and then act on the ignition electrode. It belongs to the post-mixing combustion and belongs to the diffusion type combustion. It must meet the "3T" condition to fully burn, due to natural gas and The mixed gas of air enters the combustion chamber under the action of pressure and blower, and the blower at the front end of the combustion chamber is continuously working, so the residence time of the hot air in the combustion chamber is very short. If the structural design is unreasonable, the natural gas and carbon monoxide which have not been fully decomposed are not fully decomposed. Will be quickly taken away by the fan, resulting in wasted energy. At the same time, unreasonable structural design can also result in low uniformity of hot air, resulting in large fluctuations in oven temperature, which leads to product quality problems.
3. How does the company achieve 50mg/m 3 technical indicators?
In order to meet the high standard requirement of 50mg/m 3 , the R&D team of Qijie Company has succeeded in continuous testing and testing. In the choice of burners and their valve sets, all imported brands are used to ensure combustion sufficiency and safety. On the combustion, 99% of the natural gas entering the burner is completely burned, and the intake air volume of the burner is controlled by the servo motor, and the linear ratio adjustment method is adopted to realize the stepless speed regulation. While adjusting the gas consumption, the inlet air volume passes through the linkage mechanism. Simultaneous control ensures that the flame does not mutate and also ensures that the flame does not extinguish during a small fire, thus ensuring the sufficiency of combustion and temperature stability.
In the design of the combustion box, the research and development personnel of Jiejie first adopted the three-dimensional modeling method to design a reasonable flow path, combined with the actual detection, and constantly revised. Through repeated practice, the company obtained the current system, reaching 50mg/m 3 standard. The three-dimensional simulation system developed by Qijie Company not only meets the requirements of the wallpaper industry equipment, but also for any hot air system, through the simulation of this system, the designed heating system can ensure the uniformity of hot air.
In summary, for the selection of natural gas direct-fired heating equipment, the production enterprise can not be careless. In the process of transformation, the following points must be noted: First, safety, which is related to the safety of life and property of the enterprise, so reliable products must be selected; The second is the sufficiency of combustion, because this directly affects the energy cost; the third is temperature stability, because this is directly related to the quality and yield of the product. As long as these three aspects of work can be guaranteed, the task of oil-to-gas reform will be completed satisfactorily, which is in line with the current environmental protection trend, and will not bring additional burdens and troubles to the enterprise.
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