PRESSURE REDUCING SYSTEM FOR FUEL GAS AND NATURAL GAS DEWAXING VEHICLE

• US 20120138182A1
• Filed: 08/11/2010
• Published: 06/07/2012
• Est. Priority Date: 08/12/2009
• Status: Active Grant

• Current Assignee: ZYT Petroleum Equipment Co., Ltd.
• Original Assignee: ZYT Petroleum Equipment Co., Ltd.
• Inventors: Liang, Dequan, Wang, Weizhong, Dai, Xiangfu, Li, Nian, Wang, Xingpu, Li, Peng, Lu, Shucheng, Luo, Yuqiong, Li, Zhangying, Tan, Jinsong, Wu, Dan, Lin, Sen
• Granted Patent: US 9,441,577 B2
• Time in Patent Office: Days
• US Class Current: 137/899
• CPC Class Codes: B60P 3/225 Adaptations for pumps or valves
• CPC Class Codes: F02M 21/06 Apparatus for de-liquefying, e.g. by heating
• CPC Class Codes: G05D 16/2033 the plurality of throttling means being arranged in series
• CPC Class Codes: Y02T 10/30 Use of alternative fuels, e.g. biofuels
• CPC Class Codes: Y10T 137/6855 Vehicle
• CPC Class Codes: Y10T 137/7761 Electrically actuated valve
• CPC Class Codes: Y10T 137/86196 Separable with valved-connecting passage
• CPC Class Codes: Y10T 137/86292 System with plural openings, one a gas vent or access opening
• CPC Class Codes: Y10T 137/87925 Separable flow path section, valve or closure in each

Abstract

A pressure reducing system for fuel gas and a natural gas dewaxing vehicle are disclosed. The pressure reducing system (6) comprises fuel gas pipelines which consist of successively connected a high pressure pipeline (41), a medium pressure pipeline (42) and a low pressure pipeline (43) in the flow direction of fuel gas. The tail end of the low pressure pipeline (43) connects with an combustion apparatus (7). A high pressure relief valve (17), a high pressure air feed valve (21), a heat exchanger (24) and a primary pressure reducing valve subassembly are connected on the high pressure pipeline (41). The heat exchanger (24) is provided with a hot fluid inlet (24A) and a hot fluid outlet (24B), wherein the hot fluid inlet (24A) connects with an hot water apparatus (12), and the hot fluid outlet (24B) connects with an water storage apparatus. The medium pressure pipeline (42) is equipped with a medium pressure relief valve (27) and a secondary pressure reducing valve (29). The low pressure pipeline (43) is equipped with a low pressure relief valve (31) and a third pressure reducing valve (34). Because of the adoption of three-level pressure reduction, the pressure reducing system (6) for fuel gas can guarantee output pressure of natural gas meeting combustion requirements. The natural gas dewaxing vehicle comprises an automobile chassis (1), a bedplate (11), a water supply system, a dynamic system, a combustion mechanism, a gas storage device (9) and a pressure reducing system for fuel gas (6). The natural gas dewaxing vehicle, which employing the pressure reducing system (6) for fuel gas, can make it possible to use natural gas without enlarging the volume of a vehicle, and can largely reduce the cost of use and modification.

Claims

1. A fuel gas pressure reducing system comprising a fuel gas pipeline,

wherein along a flow direction of fuel gas, the fuel gas pipeline comprises a high pressure pipeline, a medium pressure pipeline and a low pressure pipeline which are successively connected,

wherein the high pressure pipeline is provided therein with a high pressure gas supply valve and a first stage pressure reducing valve assembly;

wherein the medium pressure pipeline is provided therein with a second stage pressure reducing valve; and

wherein the low pressure pipeline is provided therein with a third stage pressure reducing valve.

2. The fuel gas pressure reducing system according to claim 1, wherein the high pressure pipeline is further provided therein with a heat exchanger, the heat exchanger is located upstream of the first stage pressure reducing valve assembly.

3. The fuel gas pressure reducing system according to claim 2, wherein the high pressure pipeline is further provided therein with a high pressure relief valve, the medium pressure pipeline is further provided therein with a medium pressure relief valve, and the low pressure pipeline is further provided therein with a low pressure relief valve.

4. The fuel gas pressure reducing system according to claim 3, wherein a tail section of the low pressure pipeline is further connected to a combined solenoid valve assembly in series, the combined solenoid valve assembly comprises an overpressure cut-off solenoid valve and a flow regulating solenoid valve connected in series.

5. The fuel gas pressure reducing system according to claim 4, wherein the first stage pressure reducing valve assembly comprises two pressure reducing valves connected in parallel, and it is provided in series a cut-off valve upstream and downstream of each of the pressure reducing valves, respectively.

6. A natural gas dewaxing vehicle comprising a vehicle chassis provided thereon with a bedplate on which a water supply system, a power mechanism, a combustion mechanism, a gas storage device and a fuel gas pressure reducing system connected to the gas storage device are provided;

wherein along a flow direction of water, the water supply system comprises a water tank, a water pump, a hot water device and a heat exchanger which are successively connected via a water pipeline system, and discharged water from the heat exchanger flows back into the water tank;

wherein the combustion mechanism comprises an air blower connected to a natural gas combustion device via an air outlet pipe, the natural gas combustion device is provided to heat the hot water deice;

wherein the power mechanism comprises a power device which is connected to the air blower and the water pump and provides power to the air blower and the water pump;

wherein along a flow direction of natural gas, a gas supply system comprises the gas storage device and the fuel gas pressure reducing system, and

wherein the fuel gas pressure reducing system is the fuel gas pressure reducing system according to any one of claims 2, a tail end of the low pressure pipeline is connected to the natural gas combustion device, a beginning end of the high pressure pipeline is connected to the gas storage device;

a hot fluid inlet of the heat exchanger is connected to the hot water device, a hot fluid outlet of the heat exchanger is connected to the water tank.

7. The natural gas dewaxing vehicle according to claim 6, wherein the power device is an on-bedplate engine;

and

wherein the natural gas dewaxing vehicle further comprises a control system provided on the bedplate, the control system is connected to the natural gas combustion device, the water pump and the hot water device, respectively.

8. The natural gas dewaxing vehicle according to claim 7, wherein along the flow direction of the fuel gas, the high pressure pipeline downstream of the high pressure relief valve is provided therein with a tee joint, three gas ports of the tee joint are respectively connected to the gas storage device, the high pressure gas supply valve and a gas charging valve, a cut-off valve is connected between the gas charging valve and the tee joint in series;

the high pressure pipeline between the tee joint and the high pressure gas supply valve is provided therein with a high pressure manometer;

the high pressure pipeline between the high pressure gas supply valve and the heat exchanger is provided therein with a high pressure shut-off valve and a filter connected in series;

the medium pressure pipeline between the medium pressure relief valve and the second stage pressure reducing valve is provided therein with a medium pressure manometer;

the low pressure pipeline upstream of the low pressure relief valve is provided with a low pressure manometer;

the low pressure pipeline between the low pressure relief valve and the third stage pressure reducing valve is provided therein with a low pressure gas supply valve and a flowmeter connected in series.

9. The natural gas dewaxing vehicle according to claim 6, wherein the hot water device is a heating furnace or a heater, the air blower is a centrifugal air blower, the gas storage device is a natural gas steel cylinder group, the natural gas steel cylinder group comprises more than three natural gas steel cylinders which are connected via pipelines, a part of the natural gas steel cylinder group is provided on a top portion of the water tank, the other part of the natural gas steel cylinder group is provided on the bedplate behind the water tank.

10. The natural gas dewaxing vehicle according to claim 9, wherein a carriage is provided in a region from a front end of the bedplate to a front portion of the water tank, a bottom portion of a front end of the carriage is fixedly connected to the bedplate, a bottom portion of a rear end of the carriage is fixedly connected to the top portion of the water tank.

11. The natural gas dewaxing vehicle according to claim 6, wherein the high pressure pipeline is further provided therein with a high pressure relief valve, the medium pressure pipeline is further provided therein with a medium pressure relief valve, and the low pressure pipeline is further provided therein with a low pressure relief valve.

12. The natural gas dewaxing vehicle according to claim 11, wherein a tail section of the low pressure pipeline is further connected to a combined solenoid valve assembly in series, the combined solenoid valve assembly comprises an overpressure cut-off solenoid valve and a flow regulating solenoid valve connected in series.

13. The natural gas dewaxing vehicle according to claim 12, wherein the first stage pressure reducing valve assembly comprises two pressure reducing valves connected in parallel, and it is provided in series a cut-off valve upstream and downstream of each of the pressure reducing valves, respectively.