Method and device for pressurizing raw natural gas through natural gas pipeline network pressure energy
A natural gas pipeline network and natural gas technology, applied in the pipeline system, gas/liquid distribution and storage, mechanical equipment, etc., can solve the problems of pressure energy waste, energy waste, and threats to safe operation, etc. Reduced consumption and simple process
Active Publication Date: 2014-04-09
XINDI ENERGY ENG TECH
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Problems solved by technology
High-pressure natural gas contains huge pressure energy, and this part of pressure energy is often wasted in vain during the process of pressure regulation through pressure regulating equipment
In addition, due to the rapid drop in pressure and temperature of natural gas, it is easy to pose a threat to the safe operation of pressure regulating equipment and pipeline equipment, so it is necessary to introduce heating facilities to heat the cooled natural gas, resulting in waste of energy
Method used
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[0034] Such as figure 1 As shown, as an implementation of the method for using pipeline network pressure energy to pressurize natural gas, the method includes:
[0035] Raw natural gas 1 (pressure 2.0-6.0MPaG) from the liquefied natural gas plant enters the compression end C1 of the booster turbo expander TEC1 for pressurization (pressurization to 4.5-8.5MPaG, preferably 5-8MPaG, more preferably 5.5-7.5MPaG) , the pressurized natural gas 2 enters the first heat exchanger E1 to cool down to 35-45°C, and then enters the downstream natural gas purification and liquefaction system as the natural gas 3 to be purified and liquefied; the natural gas 4 from the high-pressure pipeline network at the gate station (pressure 2.0~6.0MPaG) into the expansion end X1 of the supercharged turboexpander TEC1 for primary expansion and decompression (depressurization to 0.3~1.6MPaG, preferably 0.5~1.5MPaG, more preferably 0.7~1.2MPaG), after expansion and decompression The natural gas (low-temper...
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The invention provides a method and device for pressurizing raw natural gas through natural gas pipeline network pressure energy. The method comprises the steps that the raw natural gas of a liquefaction factory enters the compression end of a booster expansion turbine to be pressurized, and the pressurized natural gas is cooled by a heat exchanger and then enters a downstream natural gas purification and liquefaction system; high-pressure natural gas from a door station enters the expansion end of the booster expansion turbine to be expanded and depressurized, and the depressurized natural gas enters a low-pressure natural pipeline network, with the pressure adjusted, of the door station after the cold of the depressurized natural gas is recycled by the heat exchanger. The raw natural gas of the liquefied natural gas factory is pressurized through the pressure energy generated by depressurizing the high-pressure natural gas from the natural gas door station, additional compression power consumption is not needed, and the cold generated by the depressurization of the high-pressure natural gas is recycled. The depressurized natural gas enters the pipeline network, with the pressure adjusted, of the door station. Due to the fact that the pressure of the natural gas is improved, the energy consumption of the liquefaction factory is obviously reduced, and the load of the door station is lowered. The method is simple in process, and the load change operation of the device is flexible.
Description
technical field [0001] The invention relates to a method and device for boosting raw natural gas by using the pressure energy of the natural gas pipeline network, that is, using the pressure difference between the high and low pressure natural gas pipeline networks to boost the natural gas before purification and liquefaction without requiring additional compression power consumption . Background technique [0002] Pipeline natural gas is generally transported to the downstream urban pipeline network in a high-pressure way through long-distance pipelines. Before it is supplied to end users, it usually needs to enter the natural gas gate station and perform pressure reduction treatment through pressure regulating equipment so that the pressure of natural gas can match the gas consumption facilities. . High-pressure natural gas contains huge pressure energy, and this part of pressure energy is often wasted in vain during the process of pressure regulation through pressure reg...
Claims
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IPC IPC(8): F17D1/20F17D3/01
Inventor 何振勇煜龙张生傅建青韩金潮
Owner XINDI ENERGY ENG TECH