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CNG Pressure Reducing Station
Process introduction of CNG Pressure Reducing Station
Operating principle of compressed natural CNG Pressure Reducing Station: pre-heat the high-pressure natural gas inside the tank, reduce the pressure step by step, perform safety control, and metering and odorizing working procedures so that the gas pressure meets the required pressure to the pipeline. According to the pressure-regulating mechanism, it can be divided into two-stage pressure regulation and three-stage pressure regulation.
Structure introduction of CNG Pressure Reducing Station
According to the layout of equipment and station and the functions of equipment, compressed natural CNG Pressure Reducing Station can be divided into:
Unloading system (high-pressure rubber hose, quick coupler and high-pressure valve)
Pressure-regulating and heat-exchanging system (high-pressure emergency shut-off valve, heat exchanger, pressure regulator and blow-off valve)
Flow metering system (flowmeter)
Control system (central control board)
Heating system (gas-fired boiler, hot water pump, etc.)
Make the high-pressure natural gas enter the pressure-regulating and heat-exchanging system via the unloading system, perform two-stage heat exchange and two-stage or three-stage pressure regulation inside the pressure-regulating and heat-exchanging system to enter flow metering and odorizing system, and then into the pipeline. The heating system provides required heat in the process of the gas pressure reduction, and the control system monitors the whole system.
CNG Pressure Reducing Station process
A. Two-stage pressure-regulating process: connect high-pressure rubber hose and quick coupler with the steel tank truck, compress the natural gas via ball valve and high-pressure shut-off valve into one-stage heat exchanger, heat the gas inside the one-stage heat exchanger, reduce the pressure up to 0.1-0.4MPa via one-stage pressure regulator, regulate the pressure up to 1.0-4.0MPa via two-stage heat exchanger and two-stage pressure regulator, enter the flowmeter to perform flow metering, and then odorize the gas and transmit the gas into the medium-pressure pipeline.
Gas pressure, temperature, flow, water temperature, control of key valve, and two-way switch inside the pressure regulating station are controlled by central control board.
B. Three-stage pressure-regulating process: connect high-pressure rubber hose and quick coupler with the steel tank truck, compress the natural gas via ball valve and high-pressure shut-off valve into one-stage heat exchanger, heat the gas inside the one-stage heat exchanger, reduce the pressure up to 3.0-7.5MPa via one-stage pressure regulator, regulate the pressure up to 1.6-2.5MPa via two-stage heat exchanger and two-stage pressure regulator, and up to 0.1-0.4MPa via three-stage pressure regulation, enter the flowmeter to perform flow metering, and then odorize the gas and transmit the
gas into the medium-pressure pipeline. Gas pressure, temperature, flow, water temperature, control of key valve, and two-way switch inside the pressure regulating station are controlled by central control board.
CNG Pressure Reducing Station Performance Parameter Table
| Specifications | YG-300 | YG-500 | YG-1000 | YG-2000 | YG-2000 | YG-3000 | YG-4000 |
| Maximum flow per hour（Nm3/h） | 300 | 500 | 1000 | 2000 | 2000 | 3000 | 4000 |
| Structural type | One-stand-by & two-use | ||||||
| Number of heat-exchanging stages | Two-stage heat exchange | ||||||
| Number of pressure-regulating stages | Two-stage pressure regulation | Three-stage pressure regulation | |||||
| Water inlet temperature （℃） | 65-85 | 65-85 | 65-85 | 65-85 | 65-85 | 65-85 | 65-85 |
| Return water temperature of one-stage heat exchange（℃） | 60 | 60 | 60 | 60 | 60 | 60 | 60 |
| Return water temperature of two-stage heat exchange（℃） | 60 | 60 | 60 | 60 | 60 | 60 | 60 |
| Outlet gas temperature （℃） | 10-20 | 10-20 | 10-20 | 10-20 | 10-20 | 10-20 | 10-20 |
| Gas pressure after one-stage pressure regulation（MPa） | 1.0-6.0 | 1.0-6.0 | 1.0-6.0 | 2.0-6.0 | 3.0-7.5 | 3.0-7.5 | 3.0-7.5 |
| Gas pressure after two-stage pressure regulation（MPa） | 0.1-0.4 | 0.1-0.4 | 0.1-0.4 | 0.1-0.4 | 1.6-2.5 | 1.6-2.5 | 1.6-2.5 |
| Gas pressure after three-stage pressure regulation（MPa） | - | - | - | - | 0.1-0.4 | 0.1-0.4 | 0.1-0.4 |
| Outlet gas pressure（MPa） | 0.1-0.4 | 0.1-0.4 | 0.1-0.4 | 0.1-0.4 | 0.1-0.4 | 0.1-0.4 | 0.1-0.4 |
| One-stage blow-off pressure（MPa） | 1.3-7.8 | 1.3-7.8 | 2.6-7.8 | 2.6-7.8 | 3.9-9.75 | 3.9-9.75 | 3.9-9.75 |
| Two-stage blow-off pressure（MPa） | 0.13-0.52 | 0.13-0.52 | 0.13-0.52 | 0.13-0.52 | 2.08-3.25 | 2.08-3.25 | 2.08-3.25 |
| Three-stage blow-off pressure（MPa） | - | - | - | - | 0.13-0.52 | 0.13-0.52 | 0.13-0.52 |
| Inlet diameter | DN25 | DN25 | DN25 | DN40 | DN40 | DN50 | DN50 |
| Outlet diameter | DN50 | DN80 | DN80 | DN100 | DN100 | DN150 | DN150 |
| Dimensions (m) | 4.5×2×2.3 | 4.5×2×2.3 | 5.5×2×2.3 | 6.5×2×2.3 | 6.5×2×2.3 | 6.5×2×2.6 | 6.5×2×2.6 |
| Weight (tons) | 2.0 | 2.5 | 2.8 | 3.0 | 3.5 | 4 | 4 |
| Optional boiler power (kcal) | 20,000 | 25,000 | 50,000 | 100,000 | 100,000 | 150,000 | 20万 |
