CA2791305A1

CA2791305A1 - L.p.g. vaporizer for propane, butane etc. for gas burning equipment

Info

Publication number: CA2791305A1
Application number: CA2791305A
Authority: CA
Inventors: Allen A. Neufeldt
Original assignee: Individual
Current assignee: Individual
Priority date: 2012-10-15
Filing date: 2012-10-15
Publication date: 2014-04-15

Abstract

The vaporizer changes liquified petroleum gas ( propane, butane,etc. ) to vapor for gas burning equipment. The vaporizer is installed downstream from the liquified petroleum gas (L.P.G.) supply tank and before the utilizing gas equipment (eg., industrial &
construction heating, grain dryers ,asphalt heating etc.).

Description

II
L.P.G. VAPORIZER FOR PROPANE, BUTANE ETC.
FOR GAS BURNING EQUIPMENT
_ Description oi the Prior Art - -VapOrizers for liquid propane and other liquid petroleum gases- exist Most vaporizers use pressure vessels. Liquid propane expands as it cools and pressure is reduced. The - pressure.:vessel is usually heated with direct Baum to vapor-ize the propane. Over time, a residue accumulates in the pressure tank. Usually, the pressure vessel has a temperature sensing device to control the temperature of the liquid and a float to prevent liquid nom exiting Arm& the outlet of the vaporizer. Pressure vessels are expensive and they can be dangerous to operate.
Propane vaporizers used in motor vehicles for carburetion are quite small. Water from the cooling system of the motor vehicle is used to vaporize the liquid fuel.
SUMMARY OF THE INVENTION
It is an object of the present invention to ptovide a vaporizer that operates at low pressure. It is a further-object of the present invention to provide a vaporizer that vaporizes liquid petroleum gas from a high pressure supply aild is suitable for operntion on a small scale.
A vaporizer is used with a supply of liquid petroleum-gas.
The vaporizer has a helical coil with an inlet and an-outlet:
The inlet of the coil is connected to the supply of liquid petroleum gas and the liquid petroleum gas is substantially vaporized in the call. The outlet is connected to a fuel powered device and there are control means to control the flow of petroleum gas from the supply through the coil to the fuel powered device. The coil is located within a housing containing a bath and the coil is immersed in the bath with heating means to heat the cod Vaporizer and Heater Patent Application Description of the Invention Fig. 1 is a schematic side view of the vaporizer Fig. 2 is circuit diagram for the vaporizer The liquified petroleum gas flows from the fuel tank 1 through a supply line 2.
The supply line has a hydrostatic relief valve 3 and a pressure gauge 4.
The pressure of the liquified petroleum gas (L.P.gas) is reduced with a liquid regulator 6 to about 50 p.s.i.g. The enthalpy of the LPG vaporizes about 15% of the liquid propane. The pressure gauge 4 is required to adjust the regulator to the desired pressure. The propane then flows through a heat exchanger coil 8 The coil is located in a water bath 9 , where the balance of the liquid L.P.G. is vaporized. The water bath 9 is heated with an infra-red burner 10. The burner is made from sintered metallic material.
The burner is fueled from the outlet side of the vaporizer A temperature sensor 11 controls the water bath temperature to the desired temperature. A gas line 27 with regulator 28 and a solenoid valve 29 supply gas to the burner 10 which is ignited by a flame rod 12. A vapor line from the top of the propane tank 1 to the outlet of the vaporizer by-passes the vaporizer. This by-pass line burns off the light end of the carbon chain and prevents the relief valves form discharging in extreme hot weather.
When the pressure is reduced by regulator 15 to about 80 p.s.i.g. the pressure sensor 16 closes valve 17 and the vaporizer takes over.
The pressure reduction in the fuel tank prevents the tank relief valve from discharging in extreme hot weather. On the outlet side of the vaporizer, a regulator 18 controls the pressure to the requirement of utilizing equipment 30. The gas then is filtered through a filter 22 which has a molecular sieve and screen 19 which separates the compressor oil and pipe line rouge, and which is drained through valve 20.
When the vaporizer is shut down valves 5, 17, 31 close trapping liquid in the heat exchanger.
The liquid L.P.G. which is trapped in the heat exchanger coil 8 flows back to the fuel tank 1 through a by-pass line 23 with back check valve 24. Should the sensor 21 sense a temperature below the operating temperature it would shut down the vaporizer, indicating flame-out. The vaporizer would then have to be manually started.
To start the vaporizer the operator would push the momentary switch Fig 2 (35). This would close relay switch Fig 2 (32) starting the vaporizer. A by pass timer Fig 2 (33) would by pass sensor Fig 1 (21). This would allow the vaporizer to reach operating temperature and sensor Fig 1 ( 21) would close the circuit and the vaporizer would continue to operate. Fig 2 (34) is the control panel. Fig . 3 (36) is the orifice and Fig. (37) is the venturi tube.
Fig.3 (38) is the infra-red heating surface.

Claims

1. A vaporizer that vaporizes liquid propane and other natural gas liquids to vapor using a heat exchanger coil in a water bath heated with an infra-red burner.

2. The burner is fueled from the outlet side of the vaporizer through a pressure reducing regulator.

3. The infra-red surface is made from sintered metallic metal.

4. The burner is a vertical tube type heater that radiates heat in 360 to the cylindrical shaped water bath.

5. The burner is located in the center of the water bath.

6. The vaporizer has a bypass line from the top of the propane tank which supplies vapor to the outlet side of the vaporizer. This supplies fuel for start-up.

7. The vapor line draws of the very light hydrocarbons preventing the relief valves from discharging in extreme hot weather.

8. A pressure sensor shuts down the the by-pass line when the pressure is down to about 80 p.s.i.g. , and the vaporizer starts to supply the gas automatically.

9. The vaporizer supplies gas at a constant temperature and pressure, facilitating complete combustion and b.t.u input.

10. A filter located downstream of the of the operating regulator separates the compressor oil and pipe line rouge .

11 The filter contains molecular sieve and a screen.

12 A regulator at the inlet of the vaporizer reduces the pressure to about 50 p.s.i.g.
and the LPG enthalpy vaporizes 15 %, increasing the capacity of the vaporizer.

13 A high pressure inspirator which uses a venturi to mix the propane and air under high pressure conditions required to push the mixture through the sintered material.

14 The heater contains an infrared heating surface with a sintered metallic material.

15 The heater contains a layer of skein above the infrared heating surface to produce an even flow through the infrared heating surface.

16 The heater contains expanded metal which retains the skein.

17 The sintered metal mesh, skein and expanded metal are installed in a sealed metal hood which is built to withstand the high pressure produced by the orifice and venturi.

18 The vaporizer is designed to operate with a wide range of grades of propane.