阅读说明：本技术 适合系留气艇的大气气态污染物中ho2自由基在线测量系统 (online measurement system for HO 2 free radicals in atmospheric gaseous pollutants suitable for mooring airship ) 是由 陈魁 楚志刚 薛丰昌 周可 詹少伟 张越 苗春生 于 2019-08-07 设计创作，主要内容包括：本发明公开了一种适合系留气艇的大气气态污染物中HO_2自由基在线测量系统,包括气艇、在线测量HO_2自由基部件和进气管；在线测量HO_2自由基部件设于气艇的悬挂篮内,包括沿气体流经方向依次设置的过滤器、混合器、加热管、高压反应管、测量室单元和气泵；诱导激光发生发射器发射的激光射入高压反应管,气体在高压反应管内、在激光的诱导下进行反应,生成HO_2自由基；激光探测器发出激光穿过测量室单元,激光穿过测量室单元时被测量室单元中的HO_2自由基吸收,激光的强度发生衰减,激光接收器接收穿过测量室单元的激光,根据激光强度的衰减量得到HO_2自由基的浓度。本发明具有准确、高效、稳定等优点。(the invention discloses an online measuring system for HO 2 free radicals in atmospheric gaseous pollutants, which is suitable for mooring an airship and comprises the airship, an online measuring HO 2 free radical component and an air inlet pipe, wherein the online measuring HO 2 free radical component is arranged in a suspension basket of the airship and comprises a filter, a mixer, a heating pipe, a high-pressure reaction pipe, a measuring chamber unit and an air pump which are sequentially arranged along the air flowing direction, laser emitted by a laser generator is induced to enter the high-pressure reaction pipe, gas is induced in the high-pressure reaction pipe to react under the induction of the laser to generate HO 2 free radicals, a laser detector emits laser to penetrate through the measuring chamber unit, the laser is absorbed by the HO 2 free radicals in the measuring chamber unit when penetrating through the measuring chamber unit, the intensity of the laser is attenuated, and a laser receiver receives the laser penetrating through the measuring chamber unit to obtain the concentration of the HO 2 free radicals according to the attenuation amount of the intensity of the laser.)

1. An online measurement system for HO ₂ free radicals in atmospheric gaseous pollutants suitable for mooring airships, which is characterized in that:

The device comprises an airship, an online measurement HO ₂ free radical component and an air inlet pipe;

The air boat comprises an air boat body and a hanging basket, the air boat body has buoyancy after being inflated, so that the air boat rises to any height, and the hanging basket is hung below the air boat body;

an online measurement HO ₂ free base part is arranged in the suspension basket;

The online measurement HO ₂ free base component comprises a filter, a mixer, a heating pipe, a high-pressure reaction pipe, a measurement chamber unit and an air pump which are sequentially arranged along the gas flowing direction;

one end of the air inlet pipe extends out of the hanging basket, and the other end of the air inlet pipe is connected with an air inlet of a filter of the online measurement HO ₂ free radical component;

The filter removes aerosol particles in the gas, and the gas enters the mixer after being filtered;

The mixer uniformly mixes the gas, and the gas enters the heating pipe after being mixed;

the heating pipe heats gas, and the gas enters the high-pressure reaction pipe after being heated;

The component for online measurement of the HO ₂ free radicals further comprises an induced laser generator, laser emitted by the induced laser generator is emitted into the high-pressure reaction tube, gas reacts in the high-pressure reaction tube under the induction of the laser to generate HO ₂ free radicals, and the HO ₂ free radicals and residual gas enter the measurement chamber unit;

The online measurement component for the HO ₂ radicals further comprises a laser detector and a detection laser receiver, wherein laser emitted by the laser detector passes through the measurement chamber unit, the laser is absorbed by HO ₂ radicals in the measurement chamber unit when passing through the measurement chamber unit, the intensity of the laser is attenuated, the laser receiver receives the laser passing through the measurement chamber unit, and the concentration of the HO ₂ radicals is obtained according to the attenuation of the intensity of the laser;

The gas in the measuring chamber unit is discharged through an exhaust pipeline after being detected by laser;

The air pump is arranged on the exhaust pipeline and provides power for a component for measuring HO ₂ free radicals on line when air enters.

2. The on-line measurement system for the HO ₂ free radical in atmospheric gaseous pollutants suitable for mooring airship according to claim 1, wherein:

The measuring chamber unit comprises a first measuring chamber and a second measuring chamber which are sequentially arranged along the gas flowing direction;

The on-line measurement HO ₂ free radical component further comprises a first optical prism and a second optical prism;

the laser detector and the first optical prism are respectively positioned on two sides of the first measuring chamber, the detection laser receiver and the second optical prism are respectively positioned on two sides of the second measuring chamber, and the laser detector and the detection laser receiver are positioned on the same side of the measuring chamber unit;

Laser emitted by the laser detector passes through the first measuring chamber, is emitted to the first optical prism, is reflected by the first optical prism, is emitted to the second optical prism, is reflected by the second optical prism, passes through the second measuring chamber and is received by the detection laser receiver.

3. The on-line measurement system for the HO ₂ free radical in atmospheric gaseous pollutants suitable for mooring airship according to claim 1, wherein:

wherein, the wavelength of the laser emitted by the induced laser generation emitter is 248 or 266nm, the induced gas carries out chemical reaction in the high-pressure reaction tube, and the reaction process sequentially comprises the following steps:

inducing reaction with the formula of H ₂ O ₂ + hv → 2OH, wherein hv is laser of 248 or 266 nm;

The OH precursor and H ₂ O ₂ are subjected to substance exchange reaction to generate HO ₂, and the reaction equation is OH + H ₂ O ₂ → H ₂ O + HO ₂;

The wavelength of the laser emitted by the laser detector is 308 nm.

4. The on-line measurement system for the HO ₂ free radical in atmospheric gaseous pollutants suitable for mooring airship according to claim 1, wherein:

Wherein, the air outlet of the heating pipe is directly connected with the air inlet of the high-pressure reaction pipe.

5. the on-line measurement system for the HO ₂ free radical in atmospheric gaseous pollutants suitable for mooring airship according to claim 1, wherein:

The induced laser generator is arranged on the side face of the tail end of the heating pipe, and laser emitted by the induced laser generator is firstly emitted into the tail end of the heating pipe and then emitted into the high-pressure reaction pipe.

6. The on-line measurement system for the HO ₂ free radical in atmospheric gaseous pollutants suitable for mooring airship according to claim 2, wherein:

And inert coatings are coated inside the heating pipe, the high-pressure reaction pipe, the first measuring chamber and the second measuring chamber.

7. The on-line measurement system for the HO ₂ free radical in atmospheric gaseous pollutants suitable for mooring airship according to claim 2, wherein:

Wherein the on-line measuring HO ₂ radical component further comprises a mass flow meter disposed between the measuring chamber unit and the gas pump in a direction in which gas flows.

8. the on-line measurement system for the HO ₂ free radical in atmospheric gaseous pollutants suitable for mooring airship according to claim 7, wherein:

The mixer is positioned below the filter, the induced laser generator, the heating pipe and the high-pressure reaction pipe are positioned on the side surfaces of the filter and the mixer, the first measuring chamber, the second measuring chamber, the mass flow meter and the air pump are all positioned below the mixer, the induced laser generator, the heating pipe and the high-pressure reaction pipe, the laser detector and the detection laser receiver are respectively positioned above the first measuring chamber and the second measuring chamber, and the first optical prism and the second optical prism are respectively positioned below the first measuring chamber and the second measuring chamber;

The first optical prism and the direction of laser emitted by the laser detector form an included angle of 45 degrees, and the second optical prism and the first optical prism are symmetrically arranged.

9. The on-line measurement system for the HO ₂ free radical in atmospheric gaseous pollutants suitable for mooring airship according to claim 1, wherein:

wherein the heating tube heats the gas to 25 ℃.

10. the on-line measurement system for the HO ₂ free radical in atmospheric gaseous pollutants suitable for mooring airship according to claim 1, wherein:

The online measurement HO ₂ free base part is arranged in the hanging basket and used for online measurement;

the motorboat further comprises a counterweight, a cable and a cable control motor;

the balance weights are uniformly arranged on the outer side of the hanging basket;

One end of the cable is connected with the central position of the bottom of the hanging basket, the other end of the cable is connected with the cable control motor, and the cable control motor controls the length of the cable to be released, so that the airship ascends or descends.

Technical Field

The invention belongs to the field of environmental measurement, relates to an online measurement system for HO ₂ free radicals in atmospheric gaseous pollutants, and particularly relates to an online measurement system for HO ₂ free radicals in atmospheric gaseous pollutants, which is suitable for mooring airships.

background

the atmosphere HO ₂ free radical is an initiator and a catalyst of atmosphere photochemical reaction, plays a key role in the formation of dust and haze and the balance of ozone in a troposphere, and the concentration level of the atmosphere HO ₂ free radical can be used as an important index for measuring the self oxidation level of the atmosphere.

at present, the classical method for measuring HO ₂ is a laser-induced fluorescence technology, peroxy radicals HO ₂ and RO ₂ are converted into OH radicals through chemical reaction, the generated OH is detected, and the concentration of the generated OH is calculated.

disclosure of Invention

The invention provides an online measuring system for HO ₂ free radicals in atmospheric gaseous pollutants, which is suitable for mooring airships and overcomes the defects of the prior art.

in order to achieve the purpose, the invention provides an online measuring system for HO ₂ free radicals in atmospheric gaseous pollutants, which is suitable for mooring an airship, and comprises the airship, an online measuring HO ₂ free radical component and a gas inlet pipe, wherein the airship comprises an airship body and a suspension basket, the airship body is inflated to have buoyancy force so that the airship ascends to any height, the suspension basket is suspended below the airship body, the online measuring HO ₂ free radical component is arranged in the suspension basket, the online measuring HO ₂ free base component comprises a filter, a mixer, a heating pipe, a high-pressure reaction pipe, a measuring chamber unit and a gas pump which are sequentially arranged along the gas flowing direction, one end of the gas inlet pipe extends out of the suspension basket, the other end of the gas inlet pipe is connected with a gas inlet of the online measuring HO ₂ free radical component, aerosol particles in gas are removed by the filter, the gas heating pipe enters the mixer after being filtered, the mixer uniformly mixes the gas, the gas enters the measuring chamber unit, the gas is heated and enters the high-pressure reaction pipe, the online measuring part, the online measuring system further comprises an induced laser generating emitter, the laser emitter emits the high-emitter, the laser emitter emits the laser emitter, the measuring unit.

the invention further provides an online measuring system for the HO ₂ free radicals in atmospheric gaseous pollutants, which is suitable for mooring an airship and can be further characterized in that the measuring chamber unit comprises a first measuring chamber and a second measuring chamber which are sequentially arranged along the gas flowing direction, the online measuring component for HO ₂ free radicals further comprises a first optical prism and a second optical prism, the laser detector and the first optical prism are respectively positioned at two sides of the first measuring chamber, the detection laser receiver and the second optical prism are respectively positioned at two sides of the second measuring chamber, the laser detector and the detection laser receiver are positioned at the same side of the measuring chamber unit, laser emitted by the laser detector penetrates through the first measuring chamber, is emitted to the first optical prism, is reflected by the first optical prism, is emitted to the second optical prism, is reflected by the second optical prism, and is received by the detection laser receiver through the second measuring chamber.

the invention further provides an online measurement system for the free radical HO ₂ in the atmospheric gaseous pollutants suitable for mooring airships, which can be further characterized in that the wavelength of laser emitted by the induced laser generation emitter is 248 or 266nm, the induced gas is subjected to chemical reaction in the high-pressure reaction tube, the reaction process sequentially comprises the induced reaction, the reaction equation is H ₂ O ₂ + hv → 2OH, the hv is 248 or 266nm laser, the OH precursor and H ₂ O ₂ are subjected to substance exchange reaction to generate HO ₂, the reaction equation is OH + H ₂ O ₂ → H ₂ O + HO ₂, and the wavelength of the laser emitted by the laser detector is 308 nm.

Further, the invention provides an online measuring system for HO ₂ free radicals in atmospheric gaseous pollutants suitable for mooring an airship, and can also be characterized in that the outlet of a heating pipe is directly connected with the inlet of a high-pressure reaction pipe.

The invention further provides an online measuring system for HO ₂ free radicals in atmospheric gaseous pollutants suitable for mooring an airship, which can be further characterized in that an induced laser generator is arranged on the side surface of the tail end of a heating pipe, and laser emitted by the induced laser generator is firstly emitted into the tail end of the heating pipe and then emitted into a high-pressure reaction pipe.

Further, the invention provides an online measuring system for HO ₂ free radicals in atmospheric gaseous pollutants suitable for mooring an airship, and can be further characterized in that the heating pipe, the high-pressure reaction pipe, the first measuring chamber and the second measuring chamber are coated with inert coatings.

Further, the invention provides an online measurement system for HO ₂ free radicals in atmospheric gaseous pollutants suitable for mooring an airship, and can be further characterized in that the online measurement component for HO ₂ free radicals further comprises a mass flow meter, and the mass flow meter is arranged between the measurement chamber unit and the air pump along the direction of gas flow.

The invention further provides an online measuring system for HO ₂ free radicals in atmospheric gaseous pollutants suitable for mooring an airship, which can be further characterized in that a mixer is positioned below a filter, an induced laser generator, a heating pipe and a high-pressure reaction pipe are positioned on the side surfaces of the filter and the mixer, a first measuring chamber, a second measuring chamber, a mass flow meter and an air pump are all positioned below the mixer, the induced laser generator, the heating pipe and the high-pressure reaction pipe, a laser detector and a detection laser receiver are respectively positioned above the first measuring chamber and the second measuring chamber, a first optical prism and a second optical prism are respectively positioned below the first measuring chamber and the second measuring chamber, the first optical prism and the direction of laser emitted by the laser detector form an included angle of 45 degrees, and the second optical prism and the first optical prism are symmetrically arranged.

Further, the invention provides an online measurement system for HO ₂ free radicals in atmospheric gaseous pollutants suitable for mooring an airship, and may also have the characteristic that a heating pipe heats the gas to 25 ℃.

the invention further provides an online measuring system for HO ₂ free radicals in atmospheric gaseous pollutants suitable for mooring an airship, and the online measuring system is further characterized by further comprising a battery power supply system, wherein the battery power supply system is arranged in the hanging basket and supplies power for online measuring of HO ₂ free base parts, the motorboat further comprises a counterweight, a cable and a cable control motor, the counterweight is uniformly arranged outside the hanging basket, one end of the cable is connected with the center of the bottom of the hanging basket, the other end of the cable is connected with the cable control motor, and the cable control motor controls the length of the cable to enable the motorboat to ascend or descend.

the invention has the beneficial effects that the online measurement system for the HO ₂ free radical in the atmospheric gaseous pollutants suitable for mooring the airship comprises the airship and an online measurement HO ₂ free radical component, wherein the online measurement HO ₂ free base component is induced by laser to enable sample gas to react to become gas containing HO ₂ free radicals in a stable state and with concentration, and then the stable HO ₂ free radical is subjected to concentration detection by configuring a laser detector, a measurement chamber unit and a detection laser receiver.

The online measurement HO ₂ free radical component can detect the HO ₂ free radical continuously and vertically, and the online measurement HO ₂ free base component can meet the strict conditions required by high-altitude online real-time monitoring.

The method is simple and convenient to operate, can quickly, efficiently and accurately detect the components of the atmospheric gaseous HO ₂ free radical, can realize automatic control, can stably run for a long time, has reliable results, can measure the vertical distribution of the concentration of the HO ₂ free radical in the atmospheric gaseous pollutants, and provides a quick, convenient and accurate device and system for the research of human health, atmospheric pollution, climate change and the like.

Drawings

FIG. 1 is a schematic structural diagram of an online measurement system for HO ₂ free radicals in atmospheric gaseous pollutants suitable for mooring an airship;

FIG. 2 is a schematic diagram of the structure of a component for online measurement of HO ₂ radicals.

Detailed Description

The following describes embodiments of the present invention with reference to the drawings.

As shown in figure 1, the invention provides an online measurement system for HO ₂ free radicals in atmospheric gaseous pollutants suitable for mooring an airship, which comprises the airship 1, an online measurement HO ₂ free radical component 2, an air inlet pipe 3 and a battery power supply system 4.

the airship 1 includes an airship body 11, a suspension basket 12, a counterweight 13, a cable 14, and a cable control motor 15.

the airship body 11 is provided with buoyancy after being filled with helium gas, so that the airship 1 can ascend to any height. The suspension basket 12 is suspended below the airship body 11 by suspension cords 16. The balance weights 13 are uniformly arranged outside the hanging basket 12, so that the hanging basket 12 is kept in a balanced state. One end of the cable 14 is connected to the central position of the bottom of the hanging basket 12, and the other end is connected to the cable control motor 15. The cable control motor 15 is a motor rotating loop rope drum, and the cable control motor 15 controls the length of the cable 14 to enable the airship 1 to ascend or descend.

the on-line measurement HO ₂ free radical component 2 is arranged in the hanging basket 12, and the airship 1 is loaded with the on-line measurement HO ₂ free radical component 2 to ascend or descend to the height required to be measured.

The battery power supply system 4 is arranged in the hanging basket 12 and supplies power for the component 2 for measuring HO ₂ free radicals on line.

The online measurement HO ₂ radical component 2 comprises a filter 201, a mixer 202, a heating pipe 203, a high-pressure reaction pipe 204, a measurement chamber unit, a mass flow meter 206 and an air pump 207 which are arranged in sequence along the gas flowing direction.

One end of the air inlet pipe 3 extends out of the hanging basket 12, the other end of the air inlet pipe 3 is connected with an air inlet of a filter 201 of the component 2 for measuring HO ₂ free radicals on line, air enters the filter 201 from the air inlet pipe 3, the air inlet pipe 3 is a flexible pipe with the inner diameter of 3-10mm, in the embodiment, the inner diameter of the air inlet pipe 3 is 4mm, the wall thickness of the air inlet pipe is 1mm, and a transparent polytetrafluoroethylene pipe is arranged at the air inlet, and an insect-proof net is.

The filter 201 removes aerosol particles from the gas. The filter 201 is a hydrophilic filter with a pore size of 0.1-0.50 microns, in this embodiment, the pore size of the filter 201 is 0.22 microns. The gas is filtered and enters the mixer 202.

The mixer 202 uniformly mixes the gas to ensure that the components of each part of the sample gas are uniform and consistent, and provides a precondition for accurate measurement. The mixer 202 has helical blades inside, and adjacent helical blades rotate in opposite directions and are staggered by 90 degrees, preferably 3-5 helical blades. The gases are mixed and enter the heating tube 203.

The heating tube 203 heats the gas to 25 ℃, and the gas enters the high-pressure reaction tube 204 after being heated. Because the temperature of the high-altitude environment is low, the gas is heated to be constant in temperature, so that the stable proceeding of the subsequent chemical reaction is facilitated. The heating pipe 203 is a heating wire wound outside the pipeline and wrapped with heat insulation cotton, so that the internal temperature is kept constant.

The component 2 for online measurement of the HO ₂ free radicals further comprises an induced laser generator 208, laser emitted by the induced laser generator 208 is emitted into the high-pressure reaction tube 204, gas reacts in the high-pressure reaction tube 204 under the induction of the laser to generate HO ₂ free radicals, and the HO ₂ free radicals and residual gas enter the measurement chamber unit.

Wherein, the gas outlet of the heating pipe 203 is directly connected with the gas inlet of the high-pressure reaction pipe 204, i.e. the two are directly connected without pipeline connection, so as to ensure that the gas starts to react immediately after being heated, and the reaction is stably carried out at the heating temperature.

The induction laser generator 208 is disposed at the side of the end of the heating tube 203, and the laser emitted from the induction laser generator 208 is first injected into the end of the heating tube 203 and then into the high-pressure reaction tube 204. That is, the gas is premixed with the laser before leaving the heating tube 203, and then enters the high pressure reaction tube 204, so that the laser-induced chemical reaction is more sufficient.

The wavelength of the laser emitted by the induced laser generation emitter 208 is 248 or 266nm, and the induced gas carries out chemical reaction in the high-pressure reaction tube 204, wherein the reaction process sequentially comprises the following steps:

The induction reaction is first carried out, the reaction equation is H ₂ O ₂ + hv → 2OH, laser with hv of 248 or 266nm, then the OH precursor and H ₂ O ₂ carry out the material exchange reaction to generate HO ₂, the reaction equation is OH + H ₂ O ₂ → H ₂ O + HO ₂.

The component 2 for online measurement of the HO ₂ free radicals further comprises a laser detector 209 and a detection laser receiver 210, wherein the laser detector 209 emits laser light to pass through the measuring chamber unit, the laser light is absorbed by HO ₂ free radicals in the measuring chamber unit when passing through the measuring chamber unit, the intensity of the laser light is attenuated, the laser receiver receives the laser light passing through the measuring chamber unit to obtain the intensity of the received laser light, a signal is obtained through a multiplier, and the concentration of the HO ₂ free radicals is obtained according to the attenuation amount of the emitted and received laser light intensity.

The laser detector 209 emits laser light with a wavelength of 308nm for detecting and obtaining the concentration of HO ₂. the HO ₂ free radicals in the gas can absorb the laser light with the wavelength, and other components in the gas have no influence on the laser light with the wavelength.

Wherein the measuring chamber unit comprises a first measuring chamber 2051 and a second measuring chamber 2052 which are arranged in sequence along the gas flowing direction the online measuring HO ₂ radical component 2 further comprises a first optical prism 2111 and a second optical prism 2112.

The laser detector 209 and the first optical prism 2111 are respectively located on both sides of the first measurement chamber 2051, and the detection laser receiver 210 and the second optical prism 2112 are respectively located on both sides of the second measurement chamber 2052. The laser detector 209 and the detection laser receiver 210 are located on the same side of the measurement chamber unit, on one side of the measurement chamber unit, and the first optical prism 2111 and the second optical prism 2112 are located on the other side of the measurement chamber unit.

The first optical prism 2111 and the direction of the laser emitted by the laser detector 209 form an included angle of 45 degrees, and the second optical prism 2112 and the first optical prism 2111 are symmetrically arranged.

The laser emitted by the laser detector 209 passes through the first measurement chamber 2051, is emitted to the first optical prism 2111, is reflected by the first optical prism 2111, is emitted to the second optical prism 2112, is reflected by the second optical prism 2112, passes through the second measurement chamber 2052, and is received by the detection laser receiver 210. the laser emitted by the laser detector 209 sequentially passes through the first measurement chamber 2051 and the second measurement chamber 2052, namely, passes through twice HO ₂ radical absorption, so that the attenuation degree of the laser is larger, the error in receiving the laser and converting the attenuation amount of the laser is reduced, and the measurement result of the concentration of the HO ₂ radical is more accurate.

The heating pipe 203, the high-pressure reaction pipe 204, the first measurement chamber 2051, and the second measurement chamber 2052 are coated with inert coatings. The inert coating is preferably polytetrafluoroethylene, so that the reaction of the measured object and the wall surface can be avoided, and the accuracy of the measurement result is improved.

The gas in the measuring chamber unit is detected by the laser beam and then discharged through the exhaust line.

Mass flow meter 206 and air pump 207 are sequentially placed on the exhaust line in the direction of gas flow the mass flow meter 206 is used to control the mass flow of the measurement gas, preferably a flow wave of 10 mL/min. air pump 207 powers the gas entry on-line measurement of HO ₂ radical part 2. in this embodiment, air pump 207 is a Japanese Kamoer, model KVP04-1.1-12, brushless vacuum pump.

Wherein the mixer 202 is located below the filter 201, the induced laser generator 208, the heating pipe 203 and the high pressure reaction pipe 204 are located on the side surfaces of the filter 201 and the mixer 202, the first measurement chamber 2051, the second measurement chamber 2052, the mass flow meter 206 and the air pump 207 are located below the mixer 202, the induced laser generator 208, the heating pipe 203 and the high pressure reaction pipe 204, the laser detector 209 and the detection laser receiver 210 are located above the first measurement chamber 2051 and the second measurement chamber 2052, respectively, and the first optical prism 2111 and the second optical prism 2112 are located below the first measurement chamber 2051 and the second measurement chamber 2052, respectively.

The arrangement of the devices in the HO ₂ radical component 2 for online measurement can reduce the consumption of connecting pipelines to the maximum extent, reduce the overall volume of the HO ₂ radical component 2 for online measurement, and meet the working requirement of being loaded on the airship 1 on the basis of realizing accurate measurement so as to finally realize continuous online vertical monitoring of the concentration of the HO ₂ radical.