It has been more than 70 years since the founding of New China. Under the leadership of the Communist Party of China, unprecedented progress has been made. It took New China 70 years to complete and catch up with some European and American countries that have developed for more than 200 years. With the pace of development, the urbanization of the new China’s population has also exceeded half, but my country’s population base is large, and there are still nearly 700 million people living in rural areas. In 2020, China’s comprehensive poverty alleviation work has been fully completed, and the rural areas have also taken on a new look. Not only have farmers’ wallets swelled up, but the rural living environment has also been upgraded to a new level. However, while managing the living environment, new problems have also been encountered, such as Now rural domestic waste has begun to be put into buckets and collected, and some areas have also begun to classify waste at the source. While similar work is in full swing, what we need to think about is how to deal with the sudden surge of collection and storage waste?
Most rural areas are scattered and far away from cities. If they are transported to large landfills or incineration power plants in cities, the transportation costs are high. Even if they can be transported to these disposal sites, most of them cannot be accepted because the design capacity of municipal waste disposal sites is limited. This requires a flexible and flexible approach to solve the current problem. Especially in the outbreak of the new crown pneumonia epidemic in the country, many villages and roads were closed in many rural areas, and garbage could not be transported out in time, resulting in a large amount of garbage accumulation. hazard.
In order to solve this situation, a group of environmental protection enterprises headed by Haiqi Environmental Protection began to explore new solutions for rural residential waste treatment as early as 2013, and proposed a novel small-scale waste pyrolysis and gasification technology. It can be constructed in a distributed manner, and has been tested by a third-party environmental protection technology department. This type of equipment has unique environmental protection characteristics, and its emissions are far superior to the traditional waste incineration process.
Pyrolysis gasification technology is called the “third generation” waste treatment technology, and its environmental performance is better than incineration technology is the biggest advantage of this technology. The most fundamental difference between this technology and waste direct incineration technology is that pyrolysis gasification incineration technology solves the problem. Flue gas pollution problem, no secondary pollution, flue gas emission standards. In particular, it has a remarkable effect on suppressing the production of dioxins.
The core of pyrolysis gasification incineration technology is to suppress dioxins. First, in the second combustion chamber, peroxy combustion is used, and the temperature is controlled at 850-1000 °C for a gas residence time greater than 2 seconds, which can completely burn and decompose PCBs, carbon residues, etc., and reduce the residual amount of dioxins. Very few. Second, the decomposed polychlorinated biphenyls will re-synthesize dioxins at 250-300°C under the catalysis of CuCl2 and C atoms. However, in a combustion chamber, the temperature is controlled at 600°C to 800°C, and the oxygen supply is controlled to form a reducing atmosphere. Copper, aluminum, and iron will not be oxidized. Catalysts for the resynthesis of dioxins (CuO, CuC12 and other compounds), without the catalysis of CuCl2 and carbon atoms, the synthesis of dioxins would be impossible.
At the same time, the pyrolysis gasification technology can also reduce the emission of NOx and SO2. This is because the oxygen-deficient combustion in a combustion chamber is a reducing atmosphere, and N and S are rarely oxidized and remain in the slag. The unique design of the secondary combustion chamber ensures that the flue gas forms a turbulent flow and is fully mixed with the oxygen in the air. The required air excess is low, and the N source from the air is correspondingly reduced, resulting in lower NOx emissions.
In addition, studies have shown that after the pyrolysis gasification reaction, most of the chlorine contained in the garbage is transferred to the solid phase product (bottom slag), so that the HCl content in the exhaust gas is much lower than the standard limit of conventional sludge incinerators. value.
Therefore, the environmental protection characteristics of this technology are outstanding, and the exhaust emissions can meet the latest EU emission standards due to the GB18485-2014 emission standard.
In particular, the small waste pyrolysis gasification system equipment independently designed by Haiqi Environmental Protection has a daily processing capacity of 5-50 tons, which can be adapted to natural villages with a population of several thousand people, and can also be used by towns with tens of thousands of people. This type of equipment is not only environmentally friendly, but also has a modular design, which is easy to install and operate. In this way, rural garbage can be properly disposed of without being shipped out. Especially in this major epidemic, the garbage in villages and townships where the equipment was installed was promptly disposed of, which brought great convenience to local epidemic prevention and control.
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