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Device and method for producing stable and concentration-adjustable gas phase HgCl2

An adjustable and stable technology, applied in chemical instruments and methods, chemical/physical processes, mercury halide, etc., can solve the problems of operator hazards, limited use range, unstable concentration, etc. stable effect

Inactive Publication Date: 2019-07-26
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But these two methods all have deficiencies, method (1) the HgCl at the outlet of the permeation tube 2 The concentration is unstable and HgCl is volatilized at the same time 2 mixed with a lot of Hg 0 , and is expensive; method (2) requires pure HgCl 2 Reagent, however HgCl 2 It is a highly toxic substance, the purchase has been restricted, and this method will inevitably make HgCl 2 H in the flue gas 2 O, so that its scope of use is limited, while replacing HgCl 2 When in solution, HgCl is volatilized 2 Steam is easy to cause hazards to operators

Method used

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  • Device and method for producing stable and concentration-adjustable gas phase HgCl2

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Weigh 25mg CuCl 2 / α-Al 2 o 3 (sample particle size is less than 40μm), mixed with 4g of quartz sand evenly, placed in a cylindrical glass fixed-bed reactor (glass reaction tube 5) with a length of 400mm and an inner diameter of 10mm, and controlled temperature with tube furnace 6. Set at 140°C. Precisely control the flow rate of the carrier gas through the mass flow meter 2, and the carrier gas used is N 2 , the gas flow rate is 1L / min. Use a constant temperature water bath to control the temperature of the mercury permeation tube water bath to 60°C. Use the VM-3000 mercury detector to measure the concentration of elemental mercury in real time, and the measured concentration of the first elemental mercury is 250μg / m 3 , after passing through this device, Hg 0 is oxidized to HgCl 2 , the Hg detected at the outlet of the device 0 The concentration is 5μg / m 3 , the efficiency of mercury oxidation is 98%, and can remain unchanged for 20 hours. Then the HgCl prod...

Embodiment 2

[0038] Weigh 50mg CuCl 2 / α-Al 2 o 3 (sample particle size is less than 40μm), mixed with 4g of quartz sand evenly, placed in a cylindrical glass fixed-bed reactor (glass reaction tube 5) with a length of 400mm and an inner diameter of 10mm, and controlled temperature with tube furnace 6. Set at 140°C. Precisely control the flow rate of the carrier gas through the mass flow meter, the carrier gas used is N 2 , the gas flow rate is 500mL / min. Use a constant temperature water bath to control the temperature of the mercury permeation tube water bath to 60°C. Use the VM-3000 mercury detector to measure the mercury concentration in real time, and the measured first elemental mercury concentration is 450μg / m 3 , after passing through this device, Hg 0 is oxidized to HgCl 2 , the Hg detected at the outlet of the device 0 The concentration is 9μg / m 3 , the efficiency of mercury oxidation is 98%, and can remain unchanged for 30 hours. Then the HgCl produced by the device 2 T...

Embodiment 3

[0040] Weigh 50mg CuCl 2 / α-Al 2 o 3 (sample particle size is less than 40μm), mixed with 4g of quartz sand evenly, placed in a cylindrical glass fixed-bed reactor (glass reaction tube 5) with a length of 400mm and an inner diameter of 10mm, and controlled temperature with tube furnace 6. Set at 140°C to precisely control the flow rate of the carrier gas through the mass flow meter, the carrier gas used is N 2 , the gas flow rate is 1L / min. Use a constant temperature water bath to control the temperature of the mercury permeation tube water bath to 75°C. Use the VM-3000 mercury detector to measure the mercury concentration in real time, and the measured first elemental mercury concentration is 350μg / m 3 , after passing through this device, Hg 0 is oxidized to HgCl 2 , the Hg detected at the outlet of the device 0 The concentration is 7μg / m 3 , the efficiency of mercury oxidation is 98%, and can remain unchanged for 30 hours. Then the HgCl produced by the device 2 The...

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Abstract

The invention discloses a device and method for producing stable and concentration-adjustable gas phase HgCl2. The device comprises a gas carrying device, a mass flowmeter, a U-shaped pipe and a glassreaction pipe which are sequentially connected through pipelines and is characterized in that the gas carrying device is loaded with inert gas inside, an elemental mercury permeation tube is arrangedin the U-shaped pipe, the U-shaped pipe is arranged in a constant-temperature water bath pot, the upper end of the glass reaction pipe is provided with a gas inlet, the lower end of the glass reaction pipe is provided with a gas outlet, the middle section of the glass reaction pipe is provided with a quartz sand core, and the quartz sand core is loaded with silica wool and CuCl2 / alpha-Al2O3 catalyst; the glass reaction pipe is arranged in a tube furnace. The device has the advantages that Hg0 can be completely converted into HgCl2 at low temperature, gas phase HgCl2 can be efficiently and stably generated, HgCl2 concentration can be regulated by controlling Hg0 concentration, the difficulty that stable and concentration-adjustable gas phase HgCl2 is unavailable in a lab currently is solved, and the device is simple and easy to operate and has an application value.

Description

technical field [0001] The invention belongs to the technical field of mercury pollution control of coal-fired flue gas, and in particular relates to a gas-phase HgCl with stable and adjustable concentration 2 devices and methods. Background technique [0002] Mercury is a flue gas pollutant that can seriously affect people's nervous system. It has been identified as a global environmental pollutant by the United Nations Environment Program (UNEP), and has attracted extensive attention from the international community. Mercury emissions from coal combustion account for the largest share of global anthropogenic mercury emissions. Many countries and regions around the world have successively formulated relevant laws, regulations and industry standards to control mercury emissions from coal combustion. my country also clarified the mercury emission standard for the first time in 2011, so the control of mercury emission from coal combustion is imminent. [0003] Mercury in co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J8/06C01G13/04
CPCB01J8/001B01J8/06C01G13/04
Inventor 李海龙蔡良烽屈文麒杨建平
Owner CENT SOUTH UNIV