Ultra-low concentration gas safety mixing device and method

Abstract

The invention relates to ultra-low concentration gas safety mixing device and method. The device comprises an inlet flange, an inlet pipeline, a narrow-down pipeline, an outlet pipeline and an outletflange which are communicated in turn, wherein the inlet pipeline and the outlet pipeline are conventional pipelines with equal diameter; the diameter of one side, connected with the inlet pipeline, of the narrow-down pipeline is the same as that of the inlet pipeline, and the diameter of one side connected with the outlet pipeline is small; the diameter of the pipeline at the joint between the narrow-down pipeline and the outlet pipeline changes suddenly; a circle of annular pipeline is arranged on the outer wall of the narrow-down pipeline; a circle of gap communicated with an inner cavity of the annular pipeline and an inner cavity of the narrow-down pipeline is arranged at the sealing joint between the annular pipeline and the narrow-down pipeline; the gap sprays high-concentration gasinto the flowing low-concentration gas for mixing. The invention provides a method for adjusting the mixing proportion according to the output gas concentration; according to the method, the concentration of the gas output by the mixing is stabilized at about 1.2%, and explosion is prevented; moreover, regular accuracy correction can be performed on the system.

Description

technical field [0001] The invention belongs to the technical field of low-concentration gas utilization, and in particular relates to an ultra-low-concentration gas safe mixing device and a method for utilizing the device. Background technique [0002] Regenerative oxidation is an important and promising technology for dealing with coal mine ventilation gas with low methane concentration (about 0.5%), difficult enrichment, and large gas volume. In the actual operation of the thermal storage oxidation device based on the thermal storage oxidation technology, the methane concentration in the ventilation gas is too low (<0.3%) and fluctuates greatly, which is not conducive to the stable operation of the oxidation device; For heat, electricity and other energy needs, it is usually necessary to mix the extraction gas with a high concentration of methane (about 3%-5%) in the ventilation gas with a very low concentration, on the one hand to ensure that the concentration of the ...

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Problems solved by technology

[0003] However, in the process of blending, often affected by factors such as site area, conditions, and economics, the length of the pipelines where the blended gas flows through the flow monitoring point, concentration monitoring point, and oxidation device is limited, and it is difficult to Realize uniform mixing, affect the accuracy of online concentration monitoring and flow measurement, cause uneven distribution and stratification of the mixed gas calorific value, affect the stability of the temperature field of the regenerative oxidation device, and the concentration monitoring error is accompanied by potential safety hazards

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