Wind tunnel experiment method of pulverized coal piling-up dusting rules

A kind of wind tunnel experiment and experimental technology, applied in the direction of measuring device, aerodynamic test, machine/structural component test, etc., can solve the problems of raw material loss, air pollution, and less research on dust emission under loading and unloading operations, and achieve Ease of implementation and strong practicability

Inactive Publication Date: 2013-06-19
SHANDONG UNIV OF SCI & TECH
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Problems solved by technology

Under the action of dynamic loading and unloading of the stacker-reclaimer in the storage yard, a large amount of dust is released, which not only directly leads to the loss of hundreds of millions of raw materials, but also causes serious air pollution
[0003] At present, ther

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  • Wind tunnel experiment method of pulverized coal piling-up dusting rules
  • Wind tunnel experiment method of pulverized coal piling-up dusting rules
  • Wind tunnel experiment method of pulverized coal piling-up dusting rules

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Embodiment Construction

[0027] In order to better understand the present invention, it is necessary to carry out the following analysis to the dust law theory of coal dust loading earlier:

[0028] There are two main mechanisms of dust production in the process of pulverized coal stacking: (1) the escape of tiny particles during the falling process; (2) the entrainment air released when the falling particle flow hits the stack takes away some fine particles. During the falling process of pulverized coal particles, with the acceleration and expansion of the pulverized coal particle plume, air is entrained into the particle flow, and many coal particles with smaller particle sizes, and the entrained ambient air are at the core of the particle plume. The periphery of the region is mixed to form a boundary layer covered with coal dust, and the radius of the boundary layer increases with the height of the descent, see figure 1 . When the fine coal particles located in the boundary layer area are subjecte...

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Abstract

The invention discloses a wind tunnel experiment method of pulverized coal piling-up dusting rules. Experimental equipment or instruments are utilized, such as experimental wind tunnels, model machines of stacker-reclaimers, anemographs, microscale weighing scales, drying boxes and screening instruments; and by means of measurement of the dusting amount of four coal types comprising raw coal, large-mine raw coal, water washed coal and clean coal under a natural moisture content, the experimental correlation between the piling-up dusting rate and environmental wind speed, and loading and unloading heights satisfies the equation that beta=k*U<3.13>*H<1.64>, and correction factors k of the four coal types are obtained. Researches show that a certain relation exists between dusting quantity and entrainment air quantity during coal loading and unloading processes, and the values of the k are different if coal types are different. The wind tunnel experiment method is an effective method of being capable of being combined with pulverized coal piling-up dusting rule theoretical analysis, and is convenient to implement, strong in practicality, and capable of measuring the dusting quantity of different coal types along with changes of the loading and unloading heights and the wind speed. Therefore, the dusting rules during piling-up operation of coal can be explored, and basic data are provided for port dust prevention and treatment.

Description

technical field [0001] The invention relates to a wind tunnel experiment method for the law of dust emission in coal dust. Background technique [0002] The Total Suspended Particles (TSP) in my country's ports generally exceeds the standard, and the distribution of dust sources in ports is complex. 35%, 50% and 15% of the amount. The open-air operation method determines that the main dust-producing links such as storage, loading and unloading, and transmission of coal dust are completed in the open-air storage yard. Under the action of the dynamic loading and unloading of the stacker-reclaimer in the storage yard, a large amount of dust is released, which not only directly leads to the loss of hundreds of millions of raw materials, but also causes serious air pollution. [0003] At present, there are many studies on dust emission from coal stockpiling, and some relational expressions of coal powder starting wind speed and static dust emission amount have been obtained, but...

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Application Information

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IPC IPC(8): G01M9/02
Inventor 丛晓春
Owner SHANDONG UNIV OF SCI & TECH
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