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A system for simultaneous sampling and detection of no and mercury in flue gas from thermal power plants

A technology for thermal power plants and flue gas is applied in the field of environmental detection and sampling equipment, which can solve the problems of different sampling points for mercury and NO concentration, high sampling and detection costs, and no simultaneous NO and mercury sampling and detection systems have been developed. Achieving the effect of ensuring consistency and improving representativeness

Active Publication Date: 2018-07-31
HUANENG POWER INT INC +2
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Problems solved by technology

[0007] However, in the prior art, there is only a separate sampling and detection system for NO or mercury in the flue gas, and no system capable of simultaneously sampling and detecting NO and mercury has been developed, resulting in high sampling and detection costs
At the same time, because it is impossible to detect NO and mercury at the same sampling point at the same time, the obtained mercury and NO concentration values ​​are not at the same sampling point, which seriously affects the representativeness, repeatability and efficiency of NO and mercury sampling and detection.
In addition, the adsorbent used to collect mercury in flue gas is activated carbon, and those skilled in the art believe that activated carbon has an adsorption effect on NO, which also greatly restricts the simultaneous sampling and detection of NO and mercury in flue gas. system development

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  • A system for simultaneous sampling and detection of no and mercury in flue gas from thermal power plants
  • A system for simultaneous sampling and detection of no and mercury in flue gas from thermal power plants
  • A system for simultaneous sampling and detection of no and mercury in flue gas from thermal power plants

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Embodiment Construction

[0027] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0028] see figure 1, the present invention includes an off-line mercury measuring device and a sampling probe 4 for extending into the flue, the sampling probe 4 includes a housing and two independent quartz pipelines arranged in the housing and used to collect flue gas, each quartz A filter 5 and an activated carbon adsorption tube 6 filled with an adsorbent are sequentially installed on the pipeline along the flue gas flow direction; There is also a heating layer on the wall to keep the sampling probe 4 at 120-180°C. The heating layer is a heating wire wrapped with an aluminum radiator on the outer layer. When the temperature of the flue gas measured by the thermocouple is low, it can ensure that the sampling probe The temperature of the gun 4 is 120-180° C., preferably 140° C., so as to prevent the condensation of water vapor in the flue gas and cause the...

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Abstract

A system for simultaneous sampling and detection of NO and mercury in a thermal power plant flue gas, comprising an offline mercury measuring device and a sampling probe extending into a flue, wherein the flue gas pipelines of the sampling probe are several independently set quartz pipelines, and the quartz The outlet of the pipeline is connected with the flue gas dust removal, acid removal, dehumidification device, flow control device and NO detector in sequence, and the flow control device and the NO detector are connected with the computer; The probe gun is maintained at a heating layer above 120°C. Each quartz pipeline is equipped with an activated carbon adsorption tube. The activated carbon adsorption tube is filled with adsorbent. The adsorbent is divided into a mercury oxide capture layer with KCl as the adsorbent and an adsorption The agent is the elemental mercury adsorption layer of mercury-removing activated carbon. The invention can simultaneously realize the sampling and detection of two pollutants of NO and mercury in the same sampling point in the flue gas of the power plant, and can also realize parallel flow sampling and constant flow sampling, and the detection results are mutually calibrated.

Description

technical field [0001] The invention relates to an environment detection and sampling device, in particular to a system for simultaneous sampling and detection of flue gas NO and mercury in a thermal power plant. Background technique [0002] Mercury emitted from coal combustion is a highly toxic pollutant. When mercury is released into the atmosphere, it will cause serious harm. Mercury is a neurotoxin that can accumulate in brain tissue, causing movement disorders, language barriers, etc. Flue gas from thermal power plants can have a synergistic effect on mercury removal while denitrification, dust removal and desulfurization. The European Union's "Best Available Technology Reference Document for Large-Scale Combustion Plants" recommends that mercury removal be prioritized by adopting the technical route of high-efficiency dust removal, flue gas desulfurization and denitrification coordinated control. [0003] Selective catalytic reduction technology (SCR process) has be...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N1/22G01N1/34G01N33/00
Inventor 谭增强牛国平罗志王晓冰侯炜齐全
Owner HUANENG POWER INT INC
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