Method and device for pressurizing raw natural gas by using natural gas pipeline network pressure energy
A technology of natural gas and supercharged turbines, applied in pipeline systems, gas/liquid distribution and storage, mechanical equipment, etc., can solve problems such as waste of pressure energy, waste of energy, threats to safe operation, etc., to achieve flexible load-changing operations, Reduced energy consumption and simple process
Active Publication Date: 2017-02-15
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 using the pressure energy of the pipeline network to pressurize the natural gas. The method comprises that the raw natural gas of the liquefaction plant enters the compression end of the pressurized turboexpander for pressurization, and the pressurized natural gas undergoes heat exchange. After being cooled, it enters the downstream natural gas purification and liquefaction system; the high-pressure natural gas from the gate station enters the expansion end of the booster turbo expander to expand and reduce pressure. After the low-pressure natural gas pipeline network. The pressure generated by the decompression of high-pressure natural gas from the natural gas gate station can pressurize the raw natural gas of the liquefied natural gas plant, without additional compression power consumption, and recover the cooling capacity generated by the decompression of high-pressure natural gas; the depressurized natural gas enters The pipeline network after the gate station pressure regulation; due to the increase of the pressure of natural gas, the energy consumption of the liquefaction plant is significantly reduced, and on the other hand, the load of the gate station is also reduced; the process of the method of the invention is simple, and the device is flexible in load-changing operation.
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...
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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