Gas fired catalytic heater
View Patent ↗A gas fired catalytic heater is provided that foregoes the need for an electrical heating element to provide the activation energy for the hydrocarbon catalyst pad. An alcohol self-igniting catalyst pad is used to provide the activation energy to the hydrocarbon catalyst pad thereby removing dependence of the heater on an outside electrical energy source to initiate start-up of the heater. The catalyst pad includes a flexible wash coat; a noble metal dispersed on the wash coat; an anti-sintering element saturating the wash coat; and a catalyst promoter saturating the wash coat.
1. A gas fired catalytic heater comprising:
a hydrocarbon catalyst pad for igniting a hydrocarbon fuel;
an alcohol injection device;
an alcohol self-igniting catalyst pad in communication with the alcohol injection device, the alcohol self-igniting catalyst pad adapted for exothermic reaction with alcohol to provide activation energy to activate the hydrocarbon catalyst pad and initiate catalytic combustion of the hydrocarbon fuel when injected thereacross; and
a regenerating moisture trap in proximity to the alcohol self-igniting catalyst pad for adsorbing moisture thereby reducing moisture adsorbed by the alcohol self-igniting catalyst pad;
wherein the alcohol injection device comprises holes situated adjacent the alcohol self-igniting catalyst pad for spraying alcohol onto the surface of the alcohol self-igniting catalyst pad when alcohol is injected into the alcohol injection device.
2. The catalytic heater of claim 1 wherein the alcohol self-igniting catalyst pad comprises:
a flexible wash coat; and
a noble metal catalyst highly dispersed on the wash coat.
3. The catalytic heater of claim 2 , wherein the flexible wash coat is a cloth-like flexible wash coat comprising at least one compound selected from Al2O3, SiO2, TiO2 or mixtures thereof.
4. The catalytic heater of claim 2 , wherein the noble metal is an oxidation catalyst metal selected from Rh, Ru, Pd, Pt, Ir, Au or mixtures thereof.
5. The catalytic heater of claim 2 , wherein the flexible wash coat is present in an amount of from 70-99% by weight and the noble metal is present in an amount of from 1 to 30% by weight.
6. The catalytic heater of claim 1 , wherein the alcohol self-igniting catalyst pad further comprises an anti-sintering element composed of a metal selected from Ni, Sb, Zr, La, Y or mixtures thereof and is present in an amount of 5% or less by weight.
7. The catalytic heater of claim 1 , wherein the alcohol self-igniting catalyst pad further comprises a catalyst promoter, wherein the catalyst promoter is a comprised of one or more metals selected from Al, Si, Zr, Ce or their respective oxides and is present in an amount of 5% or less by weight.
8. The catalytic heater of claim 1 , wherein the hydrocarbon fuel is natural gas, ethane, propane, butane or gas-air mixtures.
9. The catalytic heater of claim 1 , wherein the alcohol self-igniting catalyst pad is for exothermic reaction with methanol, ethanol, propanol or isopropanol.
10. The catalytic heater of claim 1 , further comprising an insulation layer and wherein the alcohol self-igniting catalyst pad is sandwiched between the insulation layer and the hydrocarbon catalyst pad.
11. The catalytic heater of claim 1 , wherein the alcohol self-igniting catalyst pad is approximately 4×4 inches in size and is housed in a metallic housing of similar dimensions.
12. The catalytic heater of claim 1 , wherein the catalytic heater is an explosion proof catalytic heater.
13. The catalytic heater of claim 1 , wherein the regenerating moisture trap comprises a desiccant.