To control the dust pollution caused
by the unloading of a multilevel
ore pass, numerical simulation and similar experiments were carried
out to study the airflow and dust migration influenced by the unloading
quantity and the continuous unloading at different time intervals
in the ore pass. From this research, the following conclusions are
drawn: when the first level of the ore pass is unloaded, the third
and fourth levels are the main dust-producing positions, and the concentrations
of dust in the breathing zone can reach 85 and 325 mg/m
3
, respectively. Increasing the unloading interval and reducing the
total single unloading quantity can prevent the superposition of dust
production. The foam dust removal technology can reduce the secondary
dust generation caused by the backlash of the airflow in the ore pass,
and the dust emission rate can reach 60% at the fourth level.
Pipeline transportation has become the main mode of natural
gas
transportation. Due to inevitable aging, corrosion, and third-party
damage, natural gas pipeline leakage accidents occur frequently. Leakage
in the tunnel will lead to the leakage and accumulation of natural
gas, and the potential explosion risk will threaten the tunnel’s
safety. It is significant to elaborate on the diffusion behavior of
leaked natural gas in tunnel space for the traceability of leakage
points and the formulation of safety technical measures. In this paper,
a scale-down experimental platform for natural gas pipeline leakage
in the tunnel is built, and the influence of pipeline pressure on
natural gas diffusion characteristics is described. The results show
that the diffusion process of leaked natural gas in the tunnel space
shows obvious segmentation characteristics, and the concentration
of natural gas reaches the maximum at the end of the continuous leakage
stage. The increased pipeline pressure promotes natural gas diffusion,
and the concentration of natural gas under 1.0 and 1.2 MPa rises sharply.
First dangerous time (FDT) and maximum accumulated concentration (MAC)
have a negative correlation with the leakage distance, while FDT and
MAC have a good exponential and linear relationship with the pipeline
pressure (0.2–1.2 MPa), respectively.
In order to better apply the “situational response” model in the field of fluidized mining emergency management, it is the first step and the most critical problem to construct a reasonable scenario for fluidized mining emergency drills and reasonably put forward emergency management measures. Therefore, the structural similarity method is adopted in this paper to design emergency exercise scenarios. Firstly, a model of hierarchical structured scenarios is proposed, namely, modules of “Event-Environment-State of scenario-Disposal of task-Emergency action- Resources subject.” Secondly, a scenario chain is designed, and a prediction method of the event development trend under the current scenario is proposed. Thirdly, the calculation method of scenario similarity and the proposed emergency response scheme method under the current situation after similarity comparison are proposed. Finally, the structural similarity analysis method is used to verify the application of “scenario construction” in oil and gas pipeline accidents, and better analysis results are obtained. Through this research, the application of “scenario design” in fluidized mining emergency management has been expanded and enriched, and technical support for “scenario design” of fluidized mining assisted decisions is provided.
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