Reforming chamber with multiple electrodes to generate hydrogen
Embodiments described herein generally relate to a reforming chamber housing a hydrocarbon-water mixture and receiving a control voltage signal to cause molecular breakdown of the mixture and create a feed of hydrogen and carbon and dioxide that can be supplied to fuel cells. The reforming chamber includes multiple electrodes positioned across from a ground plane inside a cylindrical support structure. An input tube receives and directs the mixture to the vertical cavity where the mixture rises past the electrodes. Mixture that is not broken down is recycled back to the bottom of the vertical cavity by a fan while the resultant hydrogen and carbon dioxide is allowed to rise to a trap that separates the hydrogen from the carbon dioxide. The hydrogen can then be directed to the fuel cells or other hydrogen-dependent devices.
1. A cold plasma reforming chamber, comprising:
an input for receiving a chemical gas mixture;
a structure enveloping a vertical cavity coupled to the input and including two or more electrodes, wherein the vertical cavity provides a vertical path for the chemical gas mixture to rise past the two or more electrodes and the ground plane;
wherein the two or more electrodes are configured to receive, from a drive circuit, a control voltage large enough to produce an electrical discharge for causing a cold plasma reaction efficient to molecularly break down a portion of the chemical gas mixture into hydrogen and unreacted chemical gas mixture;
a control circuit including a sensor configured to sense a DC current or a DC voltage from the drive circuit and determine whether an electrical discharge is occurring in the vertical cavity in response to the sensed DC current or DC voltage;
a drive circuit configured to vary a variable input voltage based on the determined occurrence of the electrical discharge in the vertical cavity; and
a recycling chamber for redirecting the unreacted chemical gas mixture from an upper exit of the structure toward a reentry into the vertical cavity.
2. The cold plasma reforming chamber of claim 1 , wherein the variable input voltage is increased when the electrical discharge is not occurring in the vertical cavity and decreased or maintained when the electrical discharge is occurring in the cavity.
3. The cold plasma reforming chamber of claim 1 , wherein the control circuit comprises:
a DC-to-DC converter configured to reduce the variable input voltage before detection by the sensor;
a DC-to-AC inverter configured to produce an AC voltage based on the reduced voltage from the DC-to-DC converter; and
one or more transformers configured to generate a drive signal for the two or more electrodes based on the AC voltage.