Flow field uniform distribution device suitable for adjustable shrinkage cavity of pulverized coal pipeline

Abstract

The invention discloses a flow field uniform distribution device suitable for an adjustable shrinkage cavity of a pulverized coal pipeline, which comprises a shell, a central bluff body arranged at the center of the shell, and a first flow guide ring, a second flow guide ring and a third flow guide ring arranged between the shell and the central bluff body from outside to inside. The first flow guide ring, the second flow guide ring and the third flow guide ring are connected with the shell through the supporting ribs. The central bluff body comprises a lip-shaped bluff body and annular blades arranged in the circumferential direction of the lip-shaped bluff body, and an air inlet and an air outlet are formed in the shell in the axial direction. And a multi-layer annular airflow channel is formed among the first flow guide ring, the second flow guide ring, the third flow guide ring, the central bluff body and the shell. The distribution characteristic of airflow after adjustable shrinkage of the primary air pipe can be improved, the airflow distribution uniformity is improved, and the test requirements can be met under the existing actual conditions, so that the test precision is improved, and the working efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of coal-fired thermal power plant equipment, and in particular relates to a flow field uniform distribution device suitable for adjustable shrinkage holes in pulverized coal pipelines. Background technique [0002] The primary wind speed plays a very important role in the safe, economical and stable operation of the boiler. If the primary wind speed deviation of each layer is large, it will cause a series of problems such as deflection of the flame in the furnace, uneven heat load of the furnace, overheating of the heating surface, and coking of the water wall. Generally, a wind speed leveling test is required during the commissioning of a new unit or before and after boiler maintenance. Therefore, the accuracy of a wind speed measurement is very important to ensure the safety and economy of the boiler operating state. [0003] In order to accurately measure the primary wind speed, the commonly used primary ...

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Problems solved by technology

This method is easy to implement and has high stability, but this method has relatively strict requirements on the location of the measuring point. According to the recommendation of GB / T10184 on the measurement interface, it is required to measure the length L of the straight pipe section before the interface (upstream) 1 About 8 to 10 times the equivalent diameter of the pipe, it is required to measure the length L of the straight pipe section after the interface (downstream) 2 It is about 1 to 3 times the equivalent diameter of the pipeline. Since most current engineering projects occupy a relatively small area in order to save investment costs, and the spatial layout design is relatively compact, it is difficult to meet the standard requirements for the location of the measuring points.

In addition, for the primary air duct installed with adjustable shrinkage holes, due to the throttling interference effect of the adjustable shrinkage holes, the subsequent airflow distribution is very disordered, which largely reduces the accuracy of the primary wind speed test and reduces work efficiency. Lowering and other issues

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