Design of a liquid-piston compressor for raw-wet-biogas to produce biomethane for vehicles and back up power.

设计用于原湿沼气的液体活塞压缩机，以生产车辆用生物甲烷和备用电源。

• 批准号: 104370
• 金额: $ 8.87万
• 依托单位: ENGAS (UK) LTD
• 依托单位国家: 英国
• 项目类别: Feasibility Studies
• 财政年份: 2018
• 资助国家: 英国
• 起止时间: 2018 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=104370
• 关键词: Design; liquid; piston; compressor; raw

"Engas UK Ltd is developing a novel raw-wet biogas compressor to directly produce ultra high purity bio-methane for i) refuelling of natural gas vehicles, and ii) Cloud-based back up power. This backup power will be suited for Smart Grid services and off-grid power generation. This solution will also be exported to abroad where CNG vehicles are common and the electricity grid is often unreliable.**Problem:** There is often a lot of stranded biogas in smaller sewage treatment sites, landfill gas sites, and many existing biogas plants sites where moving raw biogas from one location to another location will create a significant business opportunity; unfortunately shipment of raw biogas is currently NOT feasible due to the high moisture content, high level of CO2 and corrosive H2S impurities. The moisture content in biogas will block the mechanical piston unless the gas is dried upfront of compression. Then CO2 will liquefy during compression at above 60bar at ambient temperature causing serious blockage of piston/valves etc. H2S in raw biogas will also cause corrosion inside the compressor. Drying of raw biogas is inefficient due to the relative humidity causing a high level of surface water in raw biogas.**Solution:** Engas UK is developing a technology where wet-corrosive biogas having high CO2 content will be compressed and dried and the CO2 will be separated thus producing about 97% Biomethane at 200-250bar, which can be then shipped to a different location for usage e.g. refuelling of vehicles, or for power generation as back up power replacing diesel generators. There is an ongoing debate to phase out diesel backup generators to reduce local pollution and for example, the Government of Delhi has banned the use of diesel generators in Delhi from Nov 2017 to reduce the air pollution, which opens up a large market for bioCNG powered back up generators.At 250 bar biomethane has 3 times greater volumetric energy density (kWh/lt) than hydrogen, and 3 times greater energy density than the best Li-ion batteries, which will be ideal for energy storage at the most economical options for £/kW installed, and £/kWh delivered.The above solution addresses all three aspects of **energy trilemma of ""Affordable, carbon neutral, high efficiency, and energy security.** This solution would be suited for stranded biogas from existing sources and also to convert the organic waste to Biomethane at dairy farms, pig farms, new sustainable housing projects, University Campus, business parks etc."

“Engas UK Ltd正在开发一种新型的生湿沼气压缩机，直接生产超高纯度的生物甲烷，用于i）天然气汽车的加油，ii）基于云的备用电源。这种备用电源将适用于智能电网服务和离网发电。该解决方案还将出口到国外，在那里CNG汽车很常见，电网往往不可靠。问题：** 在较小的污水处理场、垃圾填埋气场和许多现有的沼气厂场地中，经常有大量的滞留沼气，将原料沼气从一个地点转移到另一个地点将创造重大的商业机会;不幸的是，由于高水分含量、高水平的CO2和腐蚀性H2S杂质，目前运输原料沼气是不可行的。沼气中的水分含量会阻塞机械活塞，除非气体在压缩之前干燥。然后，在环境温度下，在60 bar以上的压缩过程中，CO2会发生膨胀，导致活塞/阀门等严重堵塞。未加工沼气中的H2S也会导致压缩机内部腐蚀。由于相对湿度导致原始沼气中的地表水含量较高，因此原始沼气的干燥效率低下。**解决方案：** Engas UK正在开发一种技术，将具有高CO2含量的湿腐蚀性沼气压缩和干燥，并将CO2分离，从而在200- 250 bar下产生约97%的生物甲烷，然后将其运送到不同的位置用于车辆加油或发电，作为替代柴油发电机的备用电源。为了减少当地的污染，人们一直在讨论逐步淘汰柴油备用发电机，例如，德里政府已经从2017年11月开始禁止在德里使用柴油发电机，以减少空气污染，这为生物CNG动力的备用发电机开辟了一个巨大的市场。在250巴的生物甲烷的体积能量密度（kWh/lt）是氢气的3倍，能量密度是最好的锂离子电池的3倍，这将是最经济的能源存储选择的理想选择，安装£/kW，交付£/kWh。上述解决方案解决了 ** 能源三难的所有三个方面：“经济实惠，碳中和，高效率和能源安全。"该解决方案将适用于现有来源的滞留沼气，也适用于将奶牛场，养猪场，新的可持续住房项目，大学校园，商业园区等的有机废物转化为生物甲烷。"