Formaldehyde Emission Reduction in Natural Gas Fired Reciprocating Internal Combustion Engines (RICE)
OwnerMartin L. Spartzinventor
Life of this patent
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Abstract
Exhaust from an NG fired stationary or non-stationary RICE, such as, for example, a lean burn RICE, is directed to a first oxidation catalyst, then to a second oxidation catalyst. The second oxidation catalyst is operated at a temperature higher than a minimum temperature required to oxidize formaldehyde (to CO2 and H2O) and lower than a minimum temperature required to form formaldehyde, e.g., from CH4 and O2.
Claims30
A method for reducing HCOH emissions from an NG or methane fired stationary RICE, the method comprising:
- directing exhaust from the NG or methane fired stationary RICE to a first oxidation catalyst, then to a second oxidation catalyst,
- wherein the second oxidation catalyst is operated at a temperature that is above a minimum temperature required for the oxidation of HCOH, and below a minimum temperature required to form HCOH.
An NG or methane fired stationary RICE system, comprising:
- a NG or methane fired stationary RICE;
- a first oxidation catalyst disposed in a pathway for exhausting products of combustion from the NG or methane fired stationary RICE;
- and
- a second oxidation catalyst disposed in said pathway, downstream from the first oxidation catalyst.
A system for reducing HCOH emissions, the system comprising:
- an NG or methane fired stationary RICE;
- a first oxidation catalyst disposed in a pathway for exhausting products of combustion from the NG or methane fired stationary RICE;
- and
- a second oxidation catalyst disposed in said pathway, downstream from the first oxidation catalyst.
A method for reducing HCOH emissions from an NG or methane fired RICE, the method comprising:
- oxidizing CO present in exhaust generated from the RICE;
- and
- oxidizing HCOH present after the oxidation of CO.
A method for reducing HCOH emissions from an NG or methane fired non-stationary RICE, the method comprising:
- directing exhaust from the NG or methane fired RICE to a first oxidation catalyst, then to a second oxidation catalyst, the RICE being located in a vehicle, equipment, or vessel,
- wherein the second oxidation catalyst is operated at a temperature that is above a minimum temperature required for the oxidation of HCOH, and below a minimum temperature required to form HCOH.
An NG or methane fired non-stationary RICE system, comprising:
- an NG or methane fired stationary RICE that is located in a vehicle, equipment, or vessel;
- a first oxidation catalyst disposed in a pathway for exhausting products of combustion from the NG or methane fired stationary RICE;
- and
- a second oxidation catalyst disposed in said pathway, downstream from the first oxidation catalyst.
Dependencies are inferred from the claim text.