A test method for gas low temperature heat transfer performance

Abstract

The invention proposes a gas low-temperature heat transfer performance test method, comprising the following steps: step 1), air tightness inspection; step 2), passing oxygen into the cooling coil; step 3), injecting liquid nitrogen into the cavity And observe the temperature sensor of the coil pipe outlet, so that the temperature after the oxygen is cooled down to the target temperature; step 4), record the temperature, pressure, flow rate at this time, and record the liquid level H1 of the liquid nitrogen at this time; step 5), put Replace the oxygen cylinder with a nitrogen cylinder, and replace the pipeline; step 6), feed methane into the cooling coil, adjust the opening of the first regulating valve and the third regulating valve, and stabilize the pressure and flow at the target value; step 7 ), repeat step 3) and step 4), record the corresponding temperature T2, pressure P2, flow Q2 of cooling methane, and record the liquid level H2 of liquid nitrogen at this time. The heat transfer method of the present invention is convection, which avoids the problem of large heat conduction resistance.

Description

technical field [0001] The invention relates to the field of industrial safety, in particular to a test method for gas low-temperature heat exchange performance. Background technique [0002] my country has abundant reserves of coalbed methane resources and great potential for development. The coalbed methane currently mined mostly contains air components such as nitrogen and oxygen, which has the risk of explosion. Coalbed methane liquefaction is one of the main application areas of coalbed methane. In the purification stage of the coalbed methane liquefaction process, in the rectification tower, with the gradual liquefaction and purification of methane, the content of oxygen and nitrogen at the top of the rectification tower gradually increases, and the content of methane is relatively low. Therefore, under the "low temperature and high pressure" working conditions of the rectification tower, methane may be within the explosion limit range. If it encounters sporadic spark...

AI Technical Summary

Problems solved by technology

Because the system is filled with fillers, it is impossible to add a coil inside the test tank to cool down. The only way is to use heat conduction, but the thermal resistance is large, and it may not be possible to cool down directly.

Images