Safe mixing method of mixing system used for mine low-concentration gas recycling

Abstract

The invention discloses a safe mixing method of a mixing system used for mine low-concentration gas recycling. The mixing system comprises a gas drainage station, a mixed gas induced draft fan, a gas mixing device and a heat storage oxidation device. The gas drainage station and the mixed gas induced draft fan are connected with the gas mixing device through pipelines correspondingly, the gas mixing device is connected with the heat storage oxidation device through a pipeline, a valve, a concentration monitor and a gas flow monitor are installed on the corresponding pipeline, and the gas mixing device is further provided with a turbulent flow gas inlet. In the safe mixing method, according to the requirement of the heat storage oxidation device and online monitoring data of the concentration monitor and the flow monitor, the flow of required mixed gas and the flow of required low-concentration gas are calculated, then air is introduced into the gas mixing device, and then the low-concentration gas is introduced into the gas mixing device. The gas mixing device is provided with the turbulent flow gas inlet to improve the mixing uniformity, the safety of the mixing process is improved through the safe mixing method, and the gas mixing device has remarkable application value.

Description

technical field [0001] The invention belongs to the technical field of low-concentration gas utilization, and in particular relates to a safe mixing method for a mixing system for recovery and utilization of low-concentration gas in mines. Background technique [0002] Due to the design of the production process of coal mines, coal mines in my country usually produce gas with different gas concentrations during the production process. Among them, high-concentration gas can be used directly, while low-concentration gas, especially ventilation gas, due to the low gas methane concentration ( <0.3%) and large fluctuations, which is not conducive to the stable operation of the oxidation device. For example, the most important and promising technology for effective treatment of ultra-low-concentration and large-volume coal mine ventilation gas is regenerative oxidation technology. Before performing regenerative oxidation, it is necessary to mix low-concentration gas with air. F...

AI Technical Summary

Problems solved by technology

[0003]Direct pipeline cross blending is the most common and simplest blending method, but the gas mixing intensity of this blending method is poor, and it is often used to improve the uniformity of gas concentration Occasions with low requirements or long-distance transportation after blending

The existing main patented technologies include CN201367915Y, CN105032225A and CN105032225A, etc. However, the existing main patented technologies have technical defects such as the blending flow rate should not be too large, the blending uniformity is low, and the pressure loss in the blending process is too large.

In addition, due to the low-concentration gas produced in the coal mine production process, its main components are alkane gases, and there is a certain explosion concentration limit for combustible gases, so that the gas mixture has strict restrictions on the gas concentration, which greatly increases The difficulty of the gas blending process and the requirements for safety

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