Landfill gas LNG vehicles use clean energy One of the most common waste treatment methods in urban areas in China is landfill. Due to biodegradation, a large amount of landfill gas is continuously generated during landfill. The main components are methane, carbon dioxide, nitrogen, oxygen, ammonia, hydrogen sulfide, Hydrogen, etc., are flammable and explosive, and also belong to toxic and odorous gases. Direct discharge will cause air pollution and cause waste of energy. Beijing Environmental Sanitation Group said that the conventional treatment of landfill gas is direct combustion emission, combustion heating or internal combustion engine power generation. Among them, internal combustion engine power generation technology has high energy efficiency and is relatively mature. However, if power supply is not available, energy cannot be recycled. . "On the one hand, we must alleviate the odor of landfills, on the other hand, we must realize the reuse of resources." He Liang, deputy general manager of Beijing Environmental Sanitation Group, said that the main component of landfill gas is methane, which is polluted into the air. The environment has wasted precious resources. In order to fully recycle the energy of landfill gas, replace traditional petrochemical energy such as gasoline, and realize waste recycling, Beijing Environmental Protection Group Environmental Research and Development Co., Ltd. has undertaken a major science and technology project organized by the Beijing Municipal Science and Technology Commission. The key technologies and demonstration engineering applications of clean fuels, starting from how to achieve high-efficiency collection and how to achieve high-efficiency purification, after three years of painstaking research, in 2010 developed key technologies and products, and obtained five patents. The reporter saw in the Daxing Anding Waste Sanitary Landfill that the park was clean and sanitary. The garbage mountain of more than 30 meters was covered by green plants. After the garbage leachate was treated, it became a small pond filled with water. Approaching the landfill, there was no smell of strong smell. A sanitation sprinkler drove into the gas trap at the Anding Waste Sanitary Landfill in Daxing District. The driver opened the fuel tank cap and skillfully inserted the gas gun marked with LNG into the fuel tank and unscrewed the valve to start filling. The driver said that when the tank is filled up, the sprinkler can run for 450 kilometers, and there is basically no pollutant discharge. It is understood that the landfill can process 5.6 million standard cubic meters of landfill gas per year and produce 2.394 million standard cubic meters of liquefied natural gas. Only the recovered landfill gas can reduce carbon dioxide emissions by 52,100 tons per year. Landfill gas resource utilization is both environmentally friendly and energy efficient The industry believes that waste recycling is the direction of waste disposal. Using landfill gas as raw material to produce clean fuel is a new measure for landfill gas utilization in China. It has the dual effects of environmental protection and energy conservation. He Liang summarized the innovations of this key technology mainly: First, the use of self-developed new high-efficiency landfill gas collection process, greatly improving the collection efficiency of landfill gas. The huge garbage mountain is not sealed. How can we effectively collect landfill gas? The research team decided to insert rows and columns of horizontal pipe vertical tubes into the pile according to the height layer, and connect the tail end of the pipe to the negative pressure device to force the landfill gas to be sucked into the anaerobic gas collecting tank. The test found that the average gas production per hour reached 1000 cubic meters, and the effect was very good. The second is to adopt a complete set of technical routes for obtaining clean fuels from landfill gas as raw materials, and to build a demonstration project with a scale of 5.6 million standard for landfill gas treatment. He Liang said that the collected landfill gas should be subjected to desulfurization, deoxidation, PC (PSA) primary decarburization unit, drying, deep dehydration purification and other processes. Thirdly, it has made important breakthroughs in key technologies such as deep purification of landfill gas, achieving deep removal of multiple impurity components in raw material gas, and recovery rate of methane is not less than 95%. The clean energy products produced are in line with national standards. standard. He Liang introduced that this system can convert methane and carbon dioxide in landfill gas into clean energy, which can significantly reduce the odor of the landfill, reduce the greenhouse effect, and also contribute to liquefied natural gas, methanol, etc., in a true sense. Turning waste into treasure. "The technical device is suitable for renewable methane-based biogas such as domestic landfill gas, biomass anaerobic biogas, and combined with landfill gas internal combustion engine power generation technology to form a complete landfill gas treatment and resource utilization system." Bright said. According to the plan, Beijing will promote the use of liquefied natural gas sanitation vehicles on a large scale. By 2015, 2,500 sanitation vehicles in Beijing will use clean energy fuel extracted from garbage to achieve the goal of “sanitation vehicles use sanitation gasâ€. In the case of expansion to taxis, buses and other fields. Beijing will also jointly develop biogas sanitation vehicles with the well-known automobile manufacturers and the domestic and international automobile manufacturers and the sanitation equipment manufacturing industry affiliated to the Beijing Environmental Sanitation Group to reduce the technical threshold and operation of landfill gas clean fuels. cost. Waste resource treatment needs to promote the approval of technical funds Vigorously increasing the proportion of waste recycling is a consensus among the industry, including local governments. According to the “Three-year Implementation Plan for Beijing Domestic Waste Treatment Facilities Construction (2013-2015)†formulated by Beijing Municipality at the beginning of this year, in 2015, Beijing daily garbage disposal capacity will reach 23,100 tons, and waste incineration, biochemical and other resource treatment. The ratio is over 70%, and the landfill ratio is reduced to less than 30%. Wu Yamei, deputy director of the Municipal Municipal Municipal Committee of Municipalities, said that the main problems facing Beijing's garbage disposal are: the gap in domestic waste disposal is large, the existing facilities are generally overloaded, and waste management is not in place. Taking kitchen waste as an example, the daily production in 2015 will reach 2,650 tons, and there is a big gap in the centralized processing capacity of kitchen waste. Second, the domestic waste treatment structure is single. In the future, Beijing will give priority to waste incineration, integrated treatment and kitchen waste recycling technology in the waste disposal route. During the “Twelfth Five-Year Plan†period, Beijing will accelerate the construction of domestic waste incineration and biochemical treatment facilities, further increase the proportion of waste incineration, and build a batch of domestic waste recycling facilities such as Lujiashan Domestic Waste Incineration Project and Nangong Domestic Waste Incineration Plant. And put into use, accelerate the construction of key waste incineration and biochemical treatment projects, and solve the problem of domestic garbage disposal gap. The insiders suggest that the first is to adopt the world's advanced and common mature technology and standards, focus on solving the technical problems of leachate concentrate treatment, resource treatment process and deodorization; carry out key demonstration projects and continuously improve the construction of domestic garbage treatment facilities. , operating and managing regulatory standards. He Liang said that the garbage produced in Beijing has “three highsâ€, that is, high water content, high organic matter content and high chlorophyll content. These indicators are among the highest in the world. This brings problems to the harmless treatment and resource utilization of garbage. We must develop our own garbage disposal technology suitable for Beijing. At present, many innovative projects have been accumulated in the fields of domestic waste cleaning and heat treatment, biomass waste resource utilization, sustainable landfill technology research, and landfill gas clean fuel. The second is to adhere to the principle of combining government investment and social investment, and encourage social capital to invest in energy conservation and environmental protection. On the one hand, the municipal and district governments should increase capital investment in the construction of waste treatment facilities, operation management and supporting municipal infrastructure construction, and clarify the subsidy policy for municipal fund construction on district and county facilities. On the other hand, encourage the society and enterprises to participate in the construction of waste treatment facilities, establish and improve the investment return mechanism, study and determine the reasonable price, charging standards, adjustment mechanism and fund guarantee system of waste disposal services, and further improve the economic compensation mechanism for waste disposal. The third is to make overall plans and layouts, formulate relevant policies on prices and economic compensation, adopt departmental parallel approval methods, speed up the project approval process, and strive to smoothly start construction of the project. Mao Da, a researcher at the environmental protection NG0 organization, said that it is very easy for people to oppose the construction of landfills or incineration sites. It is very difficult to advance the work of landing, demolition and construction. This requires an appropriate EIA report to be released to the public. , gain the trust of the people.
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Beijing's first landfill gas liquefied natural gas
With the expansion of the population, Beijing faces the difficulty of dealing with large gaps in domestic garbage disposal, reduction, harmlessness, and resource processing. In recent years, Beijing has focused on increasing the proportion of waste resource utilization and increasing the research and development of related technologies. In particular, Beijing Environmental Sanitation Group has taken the lead in developing landfill gas liquefied natural gas in the country, which has the dual effects of environmental protection and energy conservation.