Gas low-temperature heat exchange performance test method
A heat transfer performance and test method technology, which is applied in the field of industrial safety, can solve the problems of large thermal resistance, inability to directly cool down, and inability to cool down in coils, and achieve the effect of avoiding large thermal resistance of heat conduction
Active Publication Date: 2016-01-20
CHINA COAL TECH & ENG GRP CHONGQING RES INST CO LTD
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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.
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[0020] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings; it should be understood that the preferred embodiments are only for illustrating the present invention, rather than limiting the protection scope of the present invention.
[0021] A gas low-temperature heat transfer performance test system, including a cavity 1, a liquid nitrogen generator 2, a cooling coil 3, a gas generator 4, a flow meter 5, a pressure gauge 6, a temperature sensor 7, a liquid level gauge 9 and an insulation layer 10.
[0022] The cavity is used as a test container; it is enough to use a stainless steel iron drum and an insulation layer. There is no special requirement for the inner diameter of the iron barrel. After the test purpose is achieved, the diameter can be recorded. This iron barrel is used when moving into the roadway for gas distribution.
[0023] Cooling coil: Purchasing copper tube and pipe bender to wind...
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The invention provides a gas low-temperature heat exchange performance test method. The method comprises the following steps: (1) checking airtightness; (2) introducing oxygen into a cooling coil; (3) introducing liquid nitrogen into a cavity, observing an air outlet temperature sensor of the coil, and cooling oxygen to a target temperature; (4) recording a temperature, a pressure and a flow at the current, and recording a liquid level H1 of the liquid nitrogen at the moment; (5) replacing a pipeline with a nitrogen steel cylinder instead of an oxygen steel cylinder; (6) introducing methane into the cooling coil, and adjusting the apertures of a first adjusting valve and a third adjusting valve to stabilize the pressure and flow at target values; (7) repeating the step (3) and the step (4), recording a temperature T2, a pressure P2 and a flow Q2 corresponding to the cooling methane, and recording a liquid level H2 of the liquid nitrogen at the moment. A convective heat transfer method is adopted, so that the problem of large thermal conduction resistance is solved.
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...
Claims
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IPC IPC(8): G01N25/20
Inventor 陈金华肖露蔡安宁姚成林甘海龙王勇肖正令狐磊杨强兰祥云
Owner CHINA COAL TECH & ENG GRP CHONGQING RES INST CO LTD