Precooling method for infiltrative type low-temperature liquid pump

A low-temperature liquid and immersion-type technology, which is applied to the components of pumping devices for elastic fluids, liquid fuel engines, pump components, etc., can solve problems such as energy waste, safety accidents, and air pollution, and reduce production. cost, shorten the pre-cooling time, avoid the effect of waste

Inactive Publication Date: 2013-05-01
SHANDONG TAISHAN STEEL GROUP
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Problems solved by technology

With this technology, it takes about 40 minutes from the beginning of pre-cooling to normal operation. During this period, a large amo

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  • Precooling method for infiltrative type low-temperature liquid pump

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Embodiment Construction

[0014] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0015] During the use of liquefied natural gas (LNG), in order to input low-pressure natural gas into high-pressure natural gas pipeline network or gas tank, it is necessary to use submerged low-temperature liquid pump (hydrocarbon pump 5) for pressurized delivery. figure 1 Medium 1# high-pressure LNG storage tank 1 has a liquid level of 8.6m and a pressure of 0.49Mpa, and 2# low-pressure LNG storage tank 6 has a liquid level of 6.2m and a pressure of 0.39Mpa. The hydrocarbon pump 5 is also connected with a discharge pipe 4 .

[0016] First slowly open the liquid outlet root valve 2, LNG liquid flows out from the 1# low-pressure LNG storage tank, slowly open the inlet valve 3 of the hydrocarbon pump, the return valve 10 of the hydrocarbon pump, and open the return valve 9 and upper liquid inlet valve 8 of the low-pressure storage tank at the same time, ...

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Abstract

The invention discloses a precooling method for an infiltrative type low-temperature liquid pump. The method comprises the following steps of: (1) preparing two storage tanks between which a pressure difference exists, wherein the storage tanks are connected in series with the infiltrative type low-temperature liquid pump through a pipeline and a valve body arranged on the pipeline respectively; (2) opening the valve, feeding a low-temperature liquid into a low-pressure storage tank from a high-pressure storage tank by the infiltrative type low-temperature liquid pump while precooling the infiltrative type low-temperature liquid pump; and (3) when the temperature of the infiltrative type low-temperature liquid pump falls below a usage temperature according to display of a computer, which indicates that the infiltrative type low-temperature liquid pump is pre-cooled fully and can be put into use, starting the infiltrative type low-temperature liquid pump. Compared with the conventional precooling technology for an infiltrative type low-temperature liquid pump, the precooling method has the advantages that waste caused by precooling of the infiltrative type low-temperature liquid pump through low temperature dissipating liquids (such as substance which are gaseous at the normal temperature including liquefied natural gas and liquefied coal gas) is avoided, the precooling time is shortened, energy and precooling time are saved, the safety coefficient is increased, and the production cost is lowered.

Description

technical field [0001] The invention relates to a precooling method, in particular to a precooling method for an immersion cryogenic liquid pump used for transporting cryogenic liquid. Background technique [0002] In the process of using liquefied natural gas (LNG), in order to input low-pressure natural gas into high-pressure natural gas pipeline network or gas tank, submerged cryogenic liquid pumps (hydrocarbon pumps) are required for pressurized delivery. Since the immersion cryogenic liquid pump is at normal temperature and pressure before use, the natural gas in the pump is in a gaseous state, and the hydrocarbon pump can only pressurize and transport liquid natural gas, so the immersion cryogenic liquid pump must be pre-cooled to reduce It can only work under the condition of natural gas liquid, that is, below -100°C. At present, the pre-cooling technology of immersion cryogenic liquid pump is to use three divergent pipes on the top of the hydrocarbon pump. Through t...

Claims

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Application Information

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IPC IPC(8): F04B53/08
Inventor 平纪芳王学军李丰宾阚绪杰徐光富赵庆涛
Owner SHANDONG TAISHAN STEEL GROUP
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