METHOD AND DEVICE FOR CONVERTING CARBON DIOXIDE IN FLUE GAS INTO NATURAL GAS

摘要

A device for converting carbon dioxide in flue gas into natural gas using dump energy. The device includes a transformer and rectifier device, an electrolytic cell, a turbine, a carbon dioxide heater, a primary fixed bed reactor, a secondary fixed bed reactor, a natural gas condenser, and a process water line. An outlet of the transformer and rectifier device is connected to a power interface of the electrolytic cell, a gas-liquid outlet of a cathode of the electrolytic cell is connected to a gas-liquid inlet of a hydrogen separator, and a liquid outlet of the hydrogen separator is connected to a liquid reflux port of the cathode of the electrolytic cell.

主权项

1. A device for converting carbon dioxide in flue gas into natural gas using dump energy, the device comprising:
a) a transformer and rectifier device; b) an electrolytic cell; c) a turbine; d) a carbon dioxide heater ; e) a primary fixed bed reactor; f) a secondary fixed bed reactor; g) a natural gas condenser; and h) a process water line;wherein
an outlet of the transformer and rectifier device is connected to a power interface of the electrolytic cell, a gas-liquid outlet of a cathode of the electrolytic cell is connected to a gas-liquid inlet of a hydrogen separator, a liquid outlet of the hydrogen separator is connected to a liquid reflux port of the cathode of the electrolytic cell, a H2 outlet of the hydrogen separator is connected to an inlet of a hydrogen cooler, both an outlet of the hydrogen cooler and an outlet of the carbon dioxide heater are connected to an inlet of the primary fixed bed reactor; an outlet of the primary fixed bed reactor is connected to an inlet of the secondary fixed bed reactor successively through a superheater and mixed gas line of a primary heat exchanger, and an outlet of the secondary fixed bed reactor is connected to an inlet of the natural gas condenser successively through a secondary heat exchanger and a mixed gas line of the preheater; and the process water line is connected to an aqueous medium inlet of the preheater, an aqueous medium outlet of the preheater is connected to a steam inlet of the superheater through a steam pocket, a steam outlet of the superheater is connected to a steam inlet of the turbine, and an electric outlet of the turbine is connected to an inlet of the transformer and rectifier device.