Evaluation method for dilute phase pneumatic conveying powder flow stability

Abstract

The invention relates to an evaluation method for dilute phase pneumatic conveying powder flow stability. The evaluation method is characterized by comprising the following steps: obtaining a differential pressure data set of gas flowing through a Venturi tube by a differential pressure sensor, and calculating the gas flow uniformity index of a powder pneumatic conveying device to be evaluated according to the differential pressure data set under a pure airflow condition; judging whether the gas flow of the powder pneumatic conveying device to be evaluated is stable according to the gas flow uniformity index of the powder pneumatic conveying device; obtaining the differential pressure data set of a gas-powder mixed fluid flowing through the Venturi tube by a differential pressure sensor, and carrying out noise reduction treatment on the differential pressure data set under a gas-powder mixed flowing condition; calculating the powder flow uniformity index and powder flow discreteness index of the powder pneumatic conveying device to be evaluated; and judging the powder flow stability of the powder pneumatic conveying device to be evaluated. The evaluation method can be widely used in the technical fields of pneumatic conveying and data processing.

Description

technical field [0001] The invention relates to a method for evaluating flow stability of dilute-phase pneumatic conveying powder, and belongs to the technical field of pneumatic conveying and data processing. Background technique [0002] The powder dilute phase pneumatic conveying method is widely used in various production fields. The general requirement for powder pneumatic conveying devices is to be able to continuously convey powder. In the pharmaceutical, energy and other industries, in addition to meeting the general requirements, the powder pneumatic conveying device also needs to ensure that the amount of powder conveyed per unit time is as uniform as possible, that is, the flow of powder conveyed is stable. In order to improve the stability of powder flow in the process of powder dilute-phase pneumatic conveying, in addition to upgrading the technology of powder pneumatic conveying equipment, it is necessary to establish an effective, reliable and simple method fo...

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Problems solved by technology

[0003] At present, there are two main methods for evaluating the flow stability of pneumatically conveyed powder: 1) direct weighing method, that is, to measure the real-time weight change in the aggregate container to obtain the real-time powder conveying volume. However, this method is costly. And due to the need to weigh the weight of the aggregate container, the measurement equipment has a large range and low precision, and the accuracy of the measurement cannot be guaranteed; 2) Indirect measurement method, that is, using tomography, ultrasonic and other methods to measure the real-time Flow rate, however, this method has high requirements on cost, technology and operating environment, poor reliability, and is not suitable for all pneumatic conveying equipment and harsh working environments

[0004] The pressure difference generated by the fluid flowing through the pipeline is proportional to the square of the fluid flow. Therefore, in addition to the above two methods, researchers also use the pressure difference of the delivery pipeline or throttling parts to characterize the powder flow. However, due to pipeline vibration, etc. Due to the interference of external factors and the instability of gas-solid flow itself, this method can only measure the average flow of powder, and the measurement accuracy is generally not high, so it cannot be used to evaluate the stability of powder flow in the process of pneumatic conveying

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