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Gas vortex flowmeter

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1. What are the differences between a vortex flowmeter and a turbine?

Firstly, the measurement principles are different. Secondly, the measurement accuracy is also different: the vortex street measurement accuracy for liquids is 1.0, and the measurement accuracy for gases and vapors is 1.5; The maximum accuracy of measuring liquid with the vortex collapse flowmeter in the liquid reserve book is 0.2, which can also reach 0.5 in the imitation of Xiaohong; Measurement accuracy of gas 0.5.

2. What are the methods for detecting gas flow rate in gas combustion engines?

The mainstream detection methods for gas flow rate in gas combustion engines are divided into two categories: direct and indirect, which can be adapted according to the on-site working conditions and accuracy requirements The direct detection method collects gas flow data directly through a dedicated flowmeter, with high accuracy and relatively intuitive operation. The turbine flowmeter detection method utilizes the principle that the speed of the turbine under gas impact is proportional to the flow rate, and converts the speed signal into an electrical signal output. Suitable for clean, medium to low pressure gas pipelines, the common accuracy level is 0.5 to 1.0. It is important to note that a straight pipe section with a diameter of ≥ 10 times the diameter should be retained before and after installation to ensure detection accuracy. The vortex flowmeter detection method is based on the principle of fluid oscillation, and vortex generators are placed in the pipeline. When gas flows through, alternating vortices are generated, and the flow velocity is calculated by detecting the vortex frequency. Adapting to gas conditions with large p

Gas vortex flowmeter
ipe diameters and medium to high flow rates, it is not affected by small fluctuations in gas temperature and pressure, and has low daily maintenance costs. 3. Pitot tube speed measurement method measures the total pressure and static pressure of gas through pitot tubes, and calculates the instantaneous flow rate by combining the Bernoulli equation. Suitable for on-site temporary testing, only single point flow rate data can be obtained, and multiple points need to be averaged to ensure accurate results. It is not suitable for gas environments with high impurities. 2. Indirect detection method uses combustion parameters to infer gas flow rate, which is suitable for scenarios where flow meters cannot be directly installed. 1. Combustion heat balance method detects the oxygen content, exhaust temperature, and combustion heat load of the flue gas after combustion. By using combustion chemical equations to infer the theoretical combustion air volume of the gas, combined with the actual excess air coefficient, the volume flow rate of the gas is converted. It is necessary to cooperate with a flue gas analyzer to complete the detection, and the accuracy of the results is greatly affected by the sealing degree on site.

2. The pressure drop method is used for combustion engine gas pipelines with throttling devices. By measuring the pressure difference before and after the throttling element, combined with pipeline parameters and gas density, the flow rate is calculated.

. The flow coefficient of the throttling device needs to be calibrated in advance to withstand stuffiness and be suitable for working conditions where there is already a supporting pressure detection interface. 3. Precautions - Before testing, it is necess

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