Coal-fired flue gas mercury homogeneous/heterogeneous reaction form transformation mechanism device and method for detecting form of mercury by using same

Abstract

The invention discloses a coal-fired flue gas mercury homogeneous/heterogeneous reaction form transformation mechanism device and a method for detecting the form of mercury by using the same. The device comprises a feeding device, a cooling device, a dust removal filter and a detecting device, wherein the feeding device comprises a burning device of a drop tube furnace; the cooling device comprises a flue gas water-cooled tube, the flue gas water-cooled tube comprises a quartz tube core and a water-cooled tube which is wrapped outside the quartz tube core and provided with a water inlet and a water outlet, and the upper end of the flue gas water-cooled tube is connected with a lower outlet of the drop tube furnace; the upper end of the dust removal filter is connected with the lower outlet of the flue gas water-cooled tube; the detecting device comprises a temperature detector, a flue gas component detector and a mercury form detector. The device and method disclosed by the invention have the advantages that the influence of fly ash on the form of Hg in the process of sampling can be reduced or avoided, and the mutual switching between homogeneous heterogeneous researches under same experiment setting conditions is realized, thereby facilitating the implementation of comparison experiments, and facilitating the more clear understanding of the effect of particulate matters such as fly ash and the like in the heterogeneous process during Hg oxidation.

Description

technical field [0001] The present invention relates to the technical field of analysis of the influence of coal-fired flue gas components on the oxidation of Hg forms, and specifically relates to a device for the conversion mechanism of mercury in coal-fired flue gas and heterogeneous reaction forms and a method for detecting mercury forms by using the device, which can also be called It is a mechanism device and detection method for mercury homogeneous or heterogeneous reaction form transformation in coal-fired flue gas. Background technique [0002] The research on the oxidation of Hg forms by coal-fired flue gas components has always been the focus of research in the field of Hg control. The laboratory mechanism research is mostly based on the simulation of Hg homogeneous reaction in flue gas, or using general combustion test benches, such as fixed bed, ordinary Settlement furnace, to study the heterogeneous reaction of Hg in combustion flue gas. No matter in homogeneou...

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Problems solved by technology

The advantage of using the fixed bed mode is that the fly ash is fixed (for example, it is fixed on a specific filter, and the flue gas flows through the fly ash on the filter to realize the contact between the flue gas and the fly ash). Sampling and analysis will not cause changes in the form of Hg during the sampling process; however, in the fixed bed mode, the fly ash and flue gas adopt a filtration mode and carry out "more intimate contact", which cannot reflect the actual flue gas process. The contact mode cannot take into account factors such as gas diffusion, gas-solid contact time and contact form, and the experimental results often "positively deviate" from the actual out-of-phase process.

The research on the oxidation of Hg forms in the flow state of the ordinary settling furnace can better simulate the heterogeneous interaction process between the fly ash in the flue gas and the flue gas components, but it is usually not possible to conduct a good comparative study on the homogeneous reaction; in addition, due to The flue gas contains fly ash particles, and the general filtration sampling process will cause the change of Hg form, which makes the experimental results "positively deviate" from the actual results

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