Device capable of removing siloxane in combustible gas stably and continuously

Abstract

The invention discloses a device capable of removing siloxane in combustible gas stably and continuously, which belongs to the field of utilization and purification of renewable energy sources. The device comprises a refrigeration cycle, a landfill gas circulation system and a monitoring and control system, and particularly comprises a compressor, a gas-liquid separator, a condenser, two evaporators in parallel connection, an expansion valve, a drying filter, a liquid viewer, a pre-cooling heat exchanger, a sewage discharging device, a temperature sensing device, a pressure gauge, a pluralityof valves and pipelines. A novel defrosting method of self-defrosting of incoming gas is provided, refrigeration and defrosting can be operated independently and simultaneously, and effective defrosting is achieved while stable operation of the refrigeration system can be guaranteed. Meanwhile, due to the precise control system, the temperature of the landfill gas can be kept within a set temperature in the whole treatment process, and impurities such as siloxane, water and the like in the landfill gas can be removed stably, continuously and effectively.

Description

Technical field [0001] The invention relates to a device for removing impurities in combustible gas, which is mainly used to remove siloxane impurities in combustible gas, and belongs to the field of renewable energy utilization and purification. Background technique [0002] Biomass gas such as landfill gas, biogas, and petroleum-associated gas contains a large amount of methane. Compared with letting it be discharged into the atmosphere and worsening the greenhouse effect, using it as a raw material to burn for power generation is more energy-saving and environmentally friendly. However, landfill gas, biogas, and petroleum-associated gas contain a certain amount of siloxane and other impurities and moisture, which will cause damage to the equipment during the combustion process. [0003] If the landfill gas containing volatile siloxane is burned, a silicon dioxide layer will be produced on the internal surface of the internal combustion engine. The silicon dioxide coating will we...

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Problems solved by technology

Experiments have proved that the system has the following problems: 1. During the valve switching process of the system, the temperature of the incoming landfill gas rises very high when the two evaporators switch. After switching, the system treats the incoming gas to the set temperature. A stable process is required, and the treatment of gas at this stage cannot meet the requirements, and the real continuous removal of siloxane cannot be realized; 2. The defrosting method of the system is subcooling defrosting, which is easy to cause The suction is filled with liquid, and the temperature, pressure and other parameters of the refrigerant circulation system in the two evaporators vary greatly, and the stability of the system decreases; When the temperature is set, the pre-cooling effect on the incoming gas is also reduced, which in turn increases the load on the refrigeration system, causing a vicious circle for the operation and processing of the entire system

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