Element mercury and divalent mercury standard gas generation system and working method thereof

A technology for generating system and divalent mercury, applied in standard gas analyzers, analyzing gas mixtures, and structural details of gas analyzers, etc., can solve problems such as fluctuations in the concentration of divalent mercury vapor, and achieve easy generation speed and reasonable structural design , full-featured effects

Pending Publication Date: 2020-10-02
HUANENG POWER INTERNATIONAL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Some documents and patents have proposed a method of evaporating mercuric chloride solution to produce only divalent mercury vapor, but the related devices have the problem of evaporating divalent mercury deposition, resulting in large fluctuations in the concentration of divalent mercury vapor produced, and evaporating mercuric chloride solution only can produce a divalent mercury gas

Method used

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  • Element mercury and divalent mercury standard gas generation system and working method thereof
  • Element mercury and divalent mercury standard gas generation system and working method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Step 1: add the mercuric chloride standard solution diluted with deionized water to the mercuric chloride standard solution storage device 11, its concentration M1, the shut-off valve 13 is closed, and the elemental mercury control valve 15 is closed;

[0049] Step 2: Set the temperature on the left side of the heating module 9 (the carrier gas pipeline 7 side) to 180°C, and the temperature on the right side of the heating module 9 to 160°C;

[0050] Step 3: Open the divalent mercury standard gas control valve 16, set the flow value V1 of the flow valve 3, set the temperature of the preheater 4 to 160°C, open the nitrogen gas storage device 1, and purge the system for 120 seconds;

[0051] Step 4: Turn on the pump 12, set the flow rate Q1, the mercuric chloride standard solution enters the gradient evaporation chamber 8 from the liquid inlet device 10, and vaporizes to generate divalent mercury vapor;

[0052] Step 5: The nitrogen gas in the carrier gas pipeline 7 enter...

Embodiment 2

[0056] Step 1: Add the mercuric chloride standard solution diluted with deionized water to the mercuric chloride standard liquid storage device 11, its concentration M2, add reducing agent 10% tin protochloride solution to the reduction reactor 14, the shut-off valve 13 closed state , the divalent mercury calibration gas control valve 16 is closed;

[0057] Step 2: Set the temperature on the left side of the heating module 9 (the carrier gas pipeline 7 side) to 180°C, and the temperature on the right side of the heating module 9 to 160°C;

[0058] Step 3: Open the elemental mercury control valve 15, set the flow value V2 of the flow valve 3, set the temperature of the preheater 4 to 160°C, open the nitrogen gas storage device 1, and purge the system for 120 seconds;

[0059] Step 4: Turn on the pump 12, set the flow rate Q2, the mercuric chloride standard solution enters the gradient evaporation chamber 8 from the liquid inlet device 10, and vaporizes to generate divalent merc...

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Abstract

The invention discloses an element mercury and divalent mercury standard gas generation system and a working method thereof, and belongs to the technical field of gaseous mercury monitoring and analysis. A first inlet of a siphon type tee joint is connected with a low-temperature end of a gradient evaporation chamber, a high-temperature end of the gradient evaporation chamber is connected with thetee joint through a carrier gas pipeline, and the tee joint is further connected with a second inlet and a preheater; the preheater is connected with a flow valve, the flow valve is connected with afilter, and the filter is connected with a nitrogen storage device; an outlet is connected with two branches, a reduction reactor and an elemental mercury standard gas control valve are arranged on one branch, and a divalent mercury standard gas control valve is arranged on the other branch; and a heating module is arranged outside the gradient evaporation chamber, the gradient evaporation chamberis connected with a liquid inlet device, the liquid inlet device is connected with a stop valve, the stop valve is connected with a pump, and the pump is connected with a mercuric chloride standard liquid storage device. The structure design is reasonable, stable output of mercury standard gas concentrations of different valence states is achieved, and accuracy of mercury and mercury compound detection equipment checking and related scientific tests is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of gaseous mercury monitoring and analysis, and in particular relates to a system for generating elemental mercury and divalent mercury standard gas and a working method thereof. Background technique [0002] Mercury is a toxic heavy metal element. Its elemental state can migrate and transform around the world. It stays in the atmosphere for as long as 0.5 to 2 years. It will cause serious pollution to the ecological environment such as water, air and soil. In order to reduce mercury pollution and protect human health, people have carried out a lot of research work on the emission, migration, transformation, deposition and control of mercury and its compounds. [0003] In the research of mercury and its compounds in the laboratory, the elemental mercury standard gas is generally produced by mercury permeation tubes. Although a constant temperature water bath is used to ensure the stable release of elemental...

Claims

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Application Information

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IPC IPC(8): G01N33/00
CPCG01N33/0006G01N33/007G01N33/0072
Inventor 韩立鹏钟犁萧云志郭涛
Owner HUANENG POWER INTERNATIONAL
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