Method for computing air powder airflow velocity of primary air pipe of direct blowing type powder manufacturing system
A technology of milling system and calculation method, applied in the direction of measuring fluid velocity by pressure difference, measuring device, instrument, etc.
Active Publication Date: 2014-07-30
STATE GRID CORP OF CHINA +2
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Embodiment 1
[0065] The method of the present invention is used to calculate the flow rate of air powder air flow in a direct blowing type pulverizing system of a boiler in a certain company's power station:
[0066] (1) Determination of relevant parameters:
[0067] Table 1 Example 1 parameter measurement result
[0068]
[0069] (2) Bring the parameters into the following calculation formula for calculation:
[0070]
[0071] Result: Dusty airflow density ρ=1.5833 kg / m 3 ;
[0072] Use this result to calculate the airflow velocity ,get =25.67 m / s.
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The invention relates to a method for computing the air powder airflow velocity of a primary air pipe of a power station boiler direct blowing type powder manufacturing system. According to the technical scheme, the total mass Mz of the air powder airflow and total volume Vz of the air powder airflow are computed to obtain the density Rho of the air powder airflow, and the air powder airflow velocity, shown in the specification, of the primary air pipe is computed. According to the computing method, the air powder airflow speed is accurately measured, and most importantly, the density of the air powder airflow is scientifically and reasonably computed. The deviation caused by the fact that the coal dust mass is ignored in the prior art in the computing method is corrected. The measuring and computing result is more accurate and more reliable, and the safety and the economical efficiency of power plant operation are improved.
Description
technical field [0001] The invention belongs to the technical field of power generation, and in particular relates to a method for calculating the flow rate of air powder air flow in a primary air duct of a direct blowing type pulverizing system of a power station boiler. Background technique [0002] There are many kinds of air flow velocity measuring devices in the primary air duct of the direct-blowing pulverizing system, one of which is the anti-blocking back pipe. The density, and the coefficient of the back tube, calculate the flow rate of the airflow. [0003] The measuring device is usually installed in front of the air powder mixer, and the air flow rate after the air powder mixing is calculated by the air temperature before mixing, the air temperature after the air powder mixing and the air flow velocity measured by the measuring device. That is to say, the airflow velocity after the air powder is mixed is realized by calculating the parameters of the measuring de...
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Inventor 马登卿马辉汪潮洋卢晓周若明
Owner STATE GRID CORP OF CHINA
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