Device for purifying methane liquid from purified landfill gas

Abstract

The invention discloses a device for purifying methane liquid from purified landfill gas. The device comprises a pretreatment unit, a molecule sieve absorption unit, a main heat exchanger, a low-temperature rectifying tower, a nitrogen refrigeration circulation unit and a controller. The device for purifying the methane liquid from the purified landfill gas has the advantages that energy resources are fully utilized, the landfill gas can be prevented from being directly discharged into air to cause environment pollution and the greenhouse effect, the cold source and the heat source needed in the process that low-temperature rectification is carried out on the purified landfill gas to extract the methane liquid are both provided by the nitrogen refrigeration circulation unit, the device is a simple, economical and practical innovation, the energy of all working sections can achieve cold and heat energy exchange, the energy utilization rate is high, recycled liquid methane is high in purification degree, and the effects of saving energy, reducing emissions and managing the environment are achieved.

Description

technical field [0001] The invention relates to the technical field of gas cryogenic rectification and separation, in particular to a device for purifying methane liquid from purified landfill gas. Background technique [0002] With the rapid growth of population and the continuous development of natural resources, the gas produced by industrial waste and domestic waste seriously causes global warming and threatens human health, which has attracted the attention of scientists all over the world. In order to stabilize the greenhouse gas content in the atmosphere at an appropriate level and prevent drastic climate change from causing harm to human beings, the "Kyoto Protocol" was passed in Kyoto, Japan, stipulating that developed countries and developing countries undertake the obligation to reduce carbon emissions , my country began to undertake the task of reducing greenhouse gas emissions. [0003] At present, hundreds of landfills in more than 20 countries have installed l...

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Problems solved by technology

[0004] my country has promulgated the "National Action Plan for the Collection and Utilization of Landfill Gas from Urban Waste in China". The recycling and utilization of landfill gas has been highly valued and supported by leaders at all levels since it started in Anshan, Hangzhou, Nanjing and other places, and has been widely spread throughout the country. Developed and successfully mastered landfill gas pre-treatment technology, but most of them are based on direct combustion. Recently, there are also examples of using TSA and PSA processes to recover carbon dioxide and methane, but there are problems of low product purity and high cost

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