CNG Decompression station

Summary

With the change of energy structure and the increasing of environmental protection, the opening of natural gas

Development and utilization are developing rapidly.Compressed natural gas is the purified and compressed wellhead natural gas or pipeline natural gas for high-pressure storage and transportation to the use site, through multi-level heat exchange, decompression directly into the pipe network for supply to class users.

For this reason, our company has carefully developed, researched and manufactured a series of simple, convenient and flexible decompression stations.

• CNG pressure reducing station is applicable to the places where the gas pipeline network is not radiated, and it can also be used as emergency standby gas source for urban gate stations and industrial users who must continuously supply gas.
  

• CNG pressure reducing station is equipped with pressure relief column, high-pressure cut-off valve, filter, multistage heat exchange, step-by-step pressure regulation and safety control, and then enters the pipe network after measurement and odorization. According to its pressure regulation mechanism, it can be divided into two-stage pressure regulation and three-stage pressure regulation.
  

• gas pressure at all levels in the decompression station.The control of temperature, heater, water temperature, main valves and the switching between two channels (including bypass) are all controlled by the central console interlocking.
  

Basic configuration

• filter

• secondary regulator

• primary bleed valve

• primary heat exchanger

• secondary relief valve

• safety shut-off valve
  

• primary pressure regulator

• tertiary pressure regulator (tertiary system)

• flowmeter
  

Console display and control content

• gas inlet pressure

• return water temperature of secondary heat exchanger

• gas temperature before and after primary heat exchanger

• outlet pressure of secondary pressure regulator

• return water temperature of primary heat exchanger

• outlet temperature of secondary pressure regulator
  

• outlet pressure of primary pressure regulator

• high pressure cut-off at inlet side
  

Gas temperature before and after secondary heat exchanger

Voltage regulation technology

• secondary pressure regulating process: first, connect the high-pressure rubber tube and quick fitting joint with the tank car, and the compressed natural gas enters the primary heat exchanger through the ball valve, high-pressure shut-off valve and high-pressure filter. Heat the gas in the primary heat exchanger, and then reduce the pressure to 1.0-4.0mpa through the primary pressure regulator, and enter the flowmeter for heating through the secondary heat exchanger and regulating the pressure to 0.1-0.4mpa through the secondary pressure regulator.Flowmeter metering, and finally odorization of gas, input into the medium pressure pipe network.The gas pressure, temperature, flow, water temperature, control of key valves and switching between the two routes in the pressure regulating station are all controlled by the central control console through interlocking.

• three stage pressure regulating process: first, connect the high-pressure rubber tube and quick assembly joint with the tank car, and then the compressed natural gas enters the first stage heat exchanger through the ball valve, high-pressure shut-off valve and high-pressure filter. Heat the gas in the first stage heat exchanger, then reduce the pressure to 3.0-7.5mpa through the first stage pressure regulator, and then adjust the pressure to 1.6-2.5mpa through the second stage heat exchanger and the second stage pressure regulator, and then adjust the pressure to 1.6-2.5mpa through the third stage pressure regulator.After 0.1-0.4mpa, it will enter the flowmeter for metering, and finally odorize the gas and input it into the medium pressure pipe network.Gas pressure, temperature, flow rate at all levels in the regulating station
  

The temperature of the water, the control of the key valves and the switching between the two routes are all controlled by the interlocking of the central console.

Technical parameter