Combined type refrigerant low-temperature flash point testing system

Abstract

The invention relates to a combined type refrigerant low-temperature flash point testing system. In the primary refrigeration (external cooling), a Freon compressor (heat pump) is utilized to reduce the temperature of a flow medium, and the medium is in closed cycle; and in the secondary refrigeration (internal cooling), a semiconductor cold reactor is utilized, the heat dissipation end of the cold reactor is cooled by the low-temperature flow medium so as to greatly reduce the temperature of the refrigeration end. The testing system consists of an external cooling device, a flash point testing device, an isolation hood and an air drying and filtering device, wherein the flash point testing device is connected with the external cooling device via a thermal insulation pipeline, and is isolated from the environment by an organic glass cover, and an air opening of the air drying and filtering device is arranged in the cover. Compared with the prior art, the invention extends the low-temperature testing range of the existing rapid equilibrium closed cup flash point instrument, eliminates the tap water cooling method when being used, and saves water, gas drying avoids the defects of frosting and condensation, and the exhaust gas is adsorbed and discharged via filtration, which has certain energy saving and environment protection value.

Description

technical field [0001] The invention relates to a flash point test system, in particular to a low-temperature flash point test system of compound refrigeration. Background technique [0002] According to the definition of GB / T 5208-2008 / ISO3679:2004, the flash point of a chemical refers to: under the specified experimental conditions, when tested by the specified method, the steam of the test sample can be instantly ignited by using the test flame, and the flame Spread over the entire liquid surface and are corrected to the lowest temperature of the test sample at an atmospheric pressure of 101.3KPa. [0003] The principle of flash point determination by the rapid balance method is to inject a specified volume of test sample into a test cup kept at the expected flash point temperature of the test material. After a specified period of time, ignite and observe whether there is flash fire. Point to continue the test with fresh samples until the flash point is determined and th...

AI Technical Summary

Problems solved by technology

However, since the temperature of tap water (close to the heat dissipation end of the semiconductor cooling stack) usually used as a heat dissipation medium is 10°C-25°C, the lowest temperature of the test cup close to the end face of the semiconductor refrigeration can reach -10°C-0°C, which cannot Measure test samples with lower flash point, and need to turn on tap water for cooling during the test, which is not conducive to energy saving

In addition, when the test temperature is relatively low, frost or condensation will form on the surface of the test cup, which will affect the test results of the flash point

Images