Waste gasification power generation (weekly topic)

Problems faced in waste gasification for power generation: 1. Purification of biogas; 2. Utilization of biogas sludge as fertilizer, and the conflict between seasonal use and year-round production. 3. Safety issues: The recent incident with toxic cucumbers in the EU is said to have been caused by fermentation bacteria; if that is the case, the problems faced by our bioengineering sector are no less severe than those resulting from the nuclear accident in Japan. 4. The issue of grid connection: Due to the small scale of biogas power generation and its poor stability, **the power grid is unwilling to accept it. A more direct reason is that private biomass power generation would put pressure on the high management costs of state-owned enterprises; this situation means that **the power grid will do its best to restrict private enterprises from entering this field before it decides to get involved itself.

New technology uses municipal waste for gasification to generate electricity, attracting many investors 2007-06-07 09:34:39 Source: CNET Technology News Website 1 comment from users Go to forum Municipal landfill waste can be used to produce electricity, and investors are investing in this technology. Vaporization device As the energy crisis deepens, interest in finding alternative energy sources is also increasing day by day. Generating electricity from urban solid waste could become a major breakthrough in the 21st century. An American company named Ze-gen is receiving an investment of $4.5 million from Flagship Capital. This money will be used to build an experimental waste-to-energy plant, which will be completed by the end of this month. Using urban waste to generate electricity or reduce pollution is nothing new. Every day, landfill workers breathe in methane released by the decomposition of organic matter. The steam emitted from the waste incineration furnace is sufficient to drive a turbine to generate electricity. Ze-gen’s waste-to-energy plant uses gasification technology to convert waste into energy, resulting in low costs and minimal pollution. Bill Davis, CEO of Ze-gen, said, “Even if you don’t care about the environment, from an economic perspective alone, generating electricity from waste holds great economic potential compared to burying it underground.” ” Now, many companies and investors have taken a keen interest in the potential of this industry. Davis said that the United States generates 300 million tons of waste each year, and this waste could produce tens of terawatts of electricity, worth $28 billion. Jim Matheson, a partner at Flagship Capital, said that Ze-gen’s experimental methods are cleaner than traditional waste incineration methods, and they do not produce methane, a gas considered to contribute to the greenhouse effect. Matheson said, “Among all the energy sources under discussion, clean technologies and sustainable energy options are much more viable. We believe that waste materials have been **overlooked**, both in terms of their energy value and their environmental impact.” ” Ze-gen’s factories are designed to handle construction waste rather than household waste, as construction waste is of a simpler nature. Ze-gen does not burn these construction wastes, such as wood; instead, these wastes go through a high-temperature iron melting process. This chemical gasification process converts waste into synthetic gas, also known as syngas, which is primarily composed of carbon monoxide and hydrogen. Davis explained, “We use a large hydraulic feeding device to convert it into gas.” Just like toothpaste, steam keeps being emitted from the cast iron frame. ” Once synthetic gas is produced, it can be used for combustion to drive turbines and generate electricity. Ze-gen’s factory is capable of processing 10 to 50 tons of construction waste per day. In the future, a plant of this size will be able to gasify 450 tons of waste per day and generate 30 megawatts of electricity, enough to power 10,000 households. Lori Scozzafava, head of the North American Solid Waste Association, said that there are currently 89 waste-to-energy plants in the United States. Together, these plants can generate 2,700 megawatts of electricity, enough to power 2.3 million households. She said that the United States is currently considering building three more waste-to-energy plants, but gasification power plants have not yet reached commercial operation. Scozzafava said, “As the demand for renewable energy increases, interest in waste-to-energy generation is also growing. Waste-to-energy generation is not only sustainable but also makes use of materials that are available locally.” Waste-to-energy plants allow waste to be processed near where it is generated. “ Other waste-to-energy technologies include the ethanol method, the methane method, and the method of producing diesel from animal fat. Many of these technologies have already entered the realm of commercial application. Davis of Ze-gen said that in the past, generating electricity from urban waste was not given much attention due to a lack of enthusiasm for finding alternative fuels and an underestimation of the availability of raw materials. It is reported that a local waste processing facility will pay Ze-gen a \"processing fee\"; without this factory, the waste processing facility would have to transport the waste elsewhere. But Davis said that even without funding from the waste processing center, the factory is very cost-effective on its own. It is foreseeable that in the future, waste-to-energy plants will actually go out to purchase waste in order to generate electricity. If this technology is successful, it will expand the family of renewable energy technologies and reduce carbon dioxide emissions. By the end of the year, Ze-gen will know the quality of what is produced in its factory, such as the purity of syngas, and so on. In the future, this factory will also be able to gasify other types of waste.

Reply to 1# Standing in the East, OP: Is garbage gasification being carried out now? I hope we can exchange ideas!

Reply to 4# xueluwinner: I am currently working in biomass gasification; I only have a basic understanding of waste gasification for power generation. I heard a senior explain some things.

I did gasification of used tires in school, but I hardly used that skill after graduating. It’s not bad that a circulating fluidized bed boiler was used.

Generating electricity from urban waste is a great idea; however, without any prior background, social investors do not currently have the necessary conditions to get involved. Thermal power plants encouraged by our country’s policies cannot be connected to the power grid. Even if you plead with everyone possible and search online tirelessly, the price remains pitifully low. It’s not worth it at all.

I heard that Westinghouse’s plasma gasification technology has been applied to MSW gasification projects. In the UK, it is still an IGCC project.

Waste gasification is a process with significant social benefits; its raw material supply chain is closely linked to our daily lives. Through the gasification process, combustible waste from our lives can be converted into syngas, which is then used in C1 chemistry to produce various raw materials that we need. Obviously, there are many different types of waste, and therefore waste sorting has become one of the important aspects that require good social morals to regulate it. Just as traffic rules help maintain order in society, by getting used to such practices, our lives can become better. Furthermore, the diversity of waste also leads to instability in the properties of the gasification feedstock; it is necessary to organize the feedstock in certain proportions and focus on proper management, one of the foundations of which is waste sorting. Most importantly, waste is mostly solid and comes in various shapes; it needs to undergo preprocessing to meet certain requirements before it can be fed into the gasification furnace. The preprocessing step is very important. Finally, there is the gasification unit; fixed-bed gasification or moving-bed gasification generates large amounts of waste liquid and waste gas, which is very harmful to the environment. After careful consideration, high-temperature gasification or plasma gasification proved to be the best options, as a result of environmental regulations. The advantage of plasma gasification is that the waste is completely decomposed; moreover, it is easy to achieve heat balance under optimized conditions, which is very suitable for waste with a low calorific value. Our country has a large amount of idle capital; by investing a small amount of it in technology research and development, it is possible to achieve the gasification of waste using plasma, so there’s no need to envy little Japan.