Trigeneration system using DME

A trigeneration system using dimethyl ether (DME) comprising:

• a DME tank in which a DME fuel is stored;
• a DME engine driven by the DME fuel;
• a DME fuel supply unit for supplying the DME fuel stored in the DME tank to the DME engine;
• a treatment unit connected to an exhaust line for discharging exhaust gas of the DME engine and treating harmful components of the exhaust gas;
• a power generation unit for generating electricity with a driving force of the DME engine;
• and a heating/cooling unit for supplying or recovering heat by the driving force of the DME engine,
• wherein the DME fuel is supplied to the DME engine from the DME tank in a liquid state, which further comprises a fuel injection unit receiving the DME fuel through the DME fuel supply unit and injecting the DME fuel to the DME engine, wherein the DME fuel supply unit comprises a fuel injection line for supplying the DME fuel of the DME tank to the fuel injection unit, and a fuel recovery line for recovering the DME fuel from the fuel injection unit to the DME tank,
• wherein the fuel injection line comprises an electromagnetic valve provided on the side of an outlet through which the DME fuel is discharged from the DME tank;
• a filter connected downstream of the electromagnetic valve and removing foreign substances from the DME fuel;
• a fuel supply pump connected to the downstream of the filter and injecting the DME fuel into the fuel injection unit and a check valve connected to the downstream of the fuel supply pump and for preventing a reverse flow of the DME fuel,
• wherein the fuel recovery line comprises a regulator that recovers the DME fuel to adjust the pressure in order to prevent overpressure of the fuel injection unit a check valve connected to the downstream of the regulator for allowing the DME fuel to flow only from the fuel injection unit to the DME tank;
• an electromagnetic valve connected to the downstream of the check valve for determining whether to open or close the fuel recovery line;
• and a cooling fan for cooling the DME fuel flowing through the fuel recovery line,
• wherein the treatment unit generates carbon dioxide by treating the exhaust gas using a three-way catalyst, and further comprises a carbon dioxide supply unit for supplying carbon dioxide generated from the treatment unit to a demand facility,
• wherein the carbon dioxide supply unit supplies the carbon dioxide generated in the treatment unit to the demand facility at a certain time.