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Method for calculating evaporation rate of low-temperature pool liquid under continuous leakage condition

A technology of evaporation rate and low temperature, applied in the field of energy efficient utilization and safety management

Inactive Publication Date: 2019-08-27
SOUTHWEST PETROLEUM UNIV
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Disastrous consequences for workers and the surrounding environment

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  • Method for calculating evaporation rate of low-temperature pool liquid under continuous leakage condition
  • Method for calculating evaporation rate of low-temperature pool liquid under continuous leakage condition
  • Method for calculating evaporation rate of low-temperature pool liquid under continuous leakage condition

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[0029] In order to make the purpose of the present invention, the advantages and feasibility of the technical solution clearer, the present invention will be further described below in conjunction with the accompanying drawings. It should be understood that the specific implementation cases described here are only used to explain the present invention, not to limit the present invention.

[0030] The invention provides an experimental method for measuring the evaporation rate of a low-temperature expansion pool, comprising the following steps:

[0031] Step 1, determine the leakage quality of the liquid nitrogen that needs to be tested The unit is kg.

[0032] Then, leak liquid nitrogen onto the plate at a constant speed, and record the initial time of leakage t st and the termination time t end , and subtract the two to get the leakage duration Δt=t end -t st .

[0033] Calculate the leakage mass rate as:

[0034]

[0035] In the formula, Q s is the leakage mass r...

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Abstract

The invention relates to an experimental method for calculating the evaporation rate of a low-temperature liquid pool liquid under a continuous leakage condition; the experimental method comprises thefollowing steps that the leakage mass of liquid nitrogen needing to be tested is determined firstly, then the liquid nitrogen is leaked to a flat plate at a constant speed, and the mass rate of leakage is calculated; then, an electronic scale is used for measuring the change of the mass of the flat plate along with time; meanwhile, the change of the radius of the pool liquid along with time is recorded, and the area of the pool liquid is calculated; and next, the evaporation rate of the mass is calculated, so as to obtain the evaporation rate of the low-temperature expansion pool. The methodhas the advantages that the equipment is simple, the manufacturing is easy, the occupied area is small, the experiment operation is convenient, the experiment process is easy to control, the calculation method is simple, and the method is particularly suitable for small laboratory measurement. Meanwhile, a large amount of experimental data can be obtained by easily changing the leakage conditions,the conditions of the experimental environment and a concrete plate and the like.

Description

technical field [0001] The invention relates to an experimental method, which is mainly used to measure the evaporation rate of low-temperature pool liquid under the condition of continuous leakage. It belongs to the category of efficient energy utilization and safety management. Background technique [0002] Cryogenic liquids generally refer to liquids that are gases at normal temperature and pressure, but are cryogenically cooled for storage and transportation, such as liquefied natural gas (LNG), liquid ammonia, liquid nitrogen, etc. These cryogenic liquids are widely used in industry and civil as energy sources, industrial raw materials or refrigerants. [0003] Taking LNG as an example, LNG is purified natural gas, then cryogenically cooled to -162°C under normal pressure to become liquid, and its main component is methane (CH 4 ), also contains a small amount of ethane (C 2 h 6 ), propane (C 3 h 8 ), butane (C 4 h 10 ), nitrogen (N 2 )Wait. The volume of LNG ...

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Application Information

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IPC IPC(8): G01N5/04
CPCG01N5/04
Inventor 董静雅敬成君彭阳贺溢青董事尔
Owner SOUTHWEST PETROLEUM UNIV
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