A water-cooled gas sampling rake

Abstract

The invention relates to a water-cooled gas sampling rake, which is used to directly measure gas in a high-temperature and high-pressure internal flow field. The sampling section of the sampling rake includes a measuring section and a wedge-shaped bottom; the measuring rake is a hollow prism structure, and the cross section is approximately wedge-shaped; There are cooling lines and multiple sampling tubes. Compared with the cylindrical sampling section, the geometric structure of the sampling rake of the present invention is wedge-shaped, which has less damage to the rear structure of the flow field; multiple sampling tubes can avoid the interference of abnormal points, and the cooling pipeline can quickly cool the liquid in the sampling tube. The high-temperature flue gas improves the heat exchange efficiency by means of the bump on the inner wall of the measuring section and the thread on the wall of the sampling tube, and protects the wall of the sampling rake from overheating.

Description

technical field [0001] The invention relates to the field of gas sampling, in particular to a water-cooled gas sampling rake. Background technique [0002] The combustor is one of the three core components of a gas turbine. Its function is to convert the chemical energy of the fuel into thermal energy to drive the high-speed rotation of the turbine, and then convert it into mechanical work. In the combustion state, the interior of the combustion chamber flame tube is high-temperature, high-pressure, and high-speed multi-phase turbulent combustion, and its combustion effect can usually be obtained by analyzing the composition of the reaction products. As the country's requirements for pollutant emission concentration become increasingly stringent, it is necessary to accurately measure the composition of the gas at the outlet of the combustion chamber. The existing flue gas sampling equipment is mostly used to measure the composition of the flue gas at the outlet. [0003] Si...

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Problems solved by technology

[0003] Since the temperature, pressure, and flow rate of the flue gas composition measurement environment are much lower than the internal flow field of the combustion chamber, the following issues need to be paid attention to when sampling the flue gas composition: first, ensure that the combustion chemical reaction in the flue gas entering the sampling equipment The rapid termination can accurately reflect the real sample gas composition of the sampling point; secondly, the parameters such as temperature and velocity in the flow field in the combustion chamber are much higher than those at the outlet, and the sampling equipment faces serious risk of ablation, so the sampling equipment needs to be protected

[0005] However, in the low-pollution combustion technology, there is a high demand for the fine control of the flow field shape in the combustion chamber and the chemical reaction process in it. Unlike traditional combustion equipment, the flow field in the combustion chamber of a gas turbine has strong characteristics. Among them, the appearance of the sampling section of the flue gas sampling equipment in the flow field is mostly cylindrical or cuboid. During the sampling process, the sampling equipment will affect the original structure of the flow field, interfere with the reaction process in the combustion chamber, and affect the accuracy of subsequent experimental measurements. , and the cooling effect of the sampling rake still needs to be improved

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