CN102721599A - Heating device for gas sampling - Google Patents
Heating device for gas sampling Download PDFInfo
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- CN102721599A CN102721599A CN2012101337668A CN201210133766A CN102721599A CN 102721599 A CN102721599 A CN 102721599A CN 2012101337668 A CN2012101337668 A CN 2012101337668A CN 201210133766 A CN201210133766 A CN 201210133766A CN 102721599 A CN102721599 A CN 102721599A
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Abstract
The invention relates to a heating device for gas sampling. A heating rod (3) is arranged directly in a gas-guide tube (4) which is used for gas sampling, so that the heating rod (3) can contact flue gases directly and heat the flue gases. Thus, gases in the tube are heated to a set temperature rapidly and effectively, thereby preventing formation of condensed water on the tube wall, avoiding losses caused by dissolving of gas components in the condensed water, maintaining integrity and authenticity of the gas components passing through the sampling tube, and ensuring that subsequent analyses on gas components and gas concentration are accurate.
Description
Technical field
The invention belongs to the atmosphere polluting controling technology field, be specifically related to a kind of device of gas sampling heating.
Background technology
The toxic emission of pollution source such as boiler of power plant, Industrial Stoves, heating boiler is the main source that China's the greater part ambient atmosphere pollutes, and sulphuric dioxide wherein (SO2) and oxides of nitrogen (NOx) are main polluted factors.The most of country in the world all controls and monitors it.In recent years, hydrogen chloride (HCL), hydrogen fluoride (HF), gaseous mercury pollution factors such as (Hg) are also monitored more and more.In China, the large-sized boiler of enterprises such as coal-burning power plant, petroleum chemical enterprise, even the above heat supply coal-burning boiler of certain tonnage all must install and fix the continuous flue gas monitoring instrument of formula.In addition, portable smoke components direct-reading monitor is the main testing tool of each environment monitoring, environmental supervision and the Installation and Debugging of fume emission opertaing device.The flue gas sampling mode overwhelming majority of existing instrument is an extraction-type, and promptly aspiration pump is drawn into the instrumental analysis part outside flue with flue gas from flue, and flue gas compositions such as sulfur in smoke, oxides of nitrogen are analyzed.
Carry out in the process that flue gas measures actual, flue-gas temperature necessarily is higher than environment temperature, if do not add processing; Flue gas is through after being exposed to the instrument sample lines in the surrounding air; Vaporous water steam in the flue gas forms the globule because dew point reduces, and on the air guide tube wall, thereby forms condensate water.Because gaseous sulfur dioxide, oxides of nitrogen, hydrogen chloride, hydrogen fluoride etc. are materials soluble in water, these in the flue gas become branches to be partly dissolved in the condensate water, are just losing a part before to the instrumental analysis part.For example, sulphuric dioxide is very easily water-soluble, and the water of 1 unit volume can dissolve the sulphuric dioxide of 40 unit volumes, precision of analysis is produced have a strong impact on.Therefore; Lot of domestic and foreign flue gas analyzer factory is studied this problem; Released flue gas sampling system separately (comprising flue gas sampling pipe, wireway and aspiration pump) and pretreater to flue gas before getting into the instrumental analysis part, heat, processed; With the generation of condensate water in the lowering apparatus sampling thief pipeline, reduce the loss of material soluble in water in the flue gas.
The structural member of the flue gas sampling pipe of numerous model brands of using at present is as shown in Figure 1, wherein is wrapped in the heater strip of sampling pipe outer wall among the figure, and conduit is heated to reach design temperature.Heater strip is surrounded by insulation material outward.There is following shortcoming in this structure: 1) processed complex: heater strip or heating tape will be wrapped on the conduit outer wall equably, also must add heat-insulation layer in addition, must carry out the protection of insulation and corrosion-resistant.2) reliability is low: the complicated process and the use of multiple material components will cause reliability low.3) conduct heat slowly: owing to be the indirect heating mode; It is at first heated air conduit outer wall of heater strip; Gas conduit is again with the gas in the heat conducting tube; The heat that heater strip produces has only part to be used for heated air, thereby other parts are used for heating wireway and lose through the radiation of heat-insulation layer ambient.4) it is slow to reach design temperature: because it is slow to conduct heat, the temperature that reaches setting will be slow.5) temperature keeps unstable: because it is slow to conduct heat, and has the heat-insulation layer insulation, make temperature be difficult to reach accurate control, fluctuation is big.6) power consumption is big: above 3), 4), 5) 3 to have caused adding heat power consumption big.7) filtrator is difficult for heating: because preposition dirt filtrator needs often to change, this type of heating is difficult to filtrator is heated.Not heating, the fraction in the flue gas of high humility are easily with plugged filter, and influence is sampled.
Summary of the invention
In view of the defective of prior art, the object of the invention is to provide a kind of gas sampling heating arrangement and method, can with the gas of being adopted fast, accurately, stable and be heated to temperature required with low power.The present invention is based on the abundant research of flue temperature, humidity is understood, and the long-term on-the-spot test and the observation post of high humidity flue gas sampling problem drawn.
To achieve these goals, the invention provides a kind of device that gas sampling is heated, comprising: admission piece (1), filtrator (2), heating rod (3), wireway (4), outlet nozzle (5), tempilstick (6), handle (7), attachment plug (8), connecting line (9), temperature controller (10); Wherein, wireway and admission piece (1) are tightly connected, and other end sealing and fixing is on handle (7); Wireway (4) set inside tempilstick (6); Be used for measuring in real time wireway (4) gas inside temperature, and the temperature parameter of gathering is fed back to temperature controller (10) through connecting line (9), and then temperature controller (10) is according to the "on" position of the temperature value control of setting to heating rod (3); Thereby realize the temperature of adjustment wireway (4) internal gas; It is characterized in that heating rod (3) directly places in the middle of the gas sampling wireway (4), pass wireway (4) center, an end stretches out wireway; Get in the filtrator cylinder in the admission piece (1), the other end is fixed in the handle (7).
Further, the device that gas sampling is heated of the present invention is characterized in that wireway (4) is anticorrosion stainless-steel tube or polyfluortetraethylene pipe.
Further, the device that gas sampling is heated of the present invention is characterized in that the cylinder of said filtrator (2) for teflon or pottery or stainless steel material.
Further, the device that gas sampling is heated of the present invention is characterized in that said heating rod (3) is a stainless steel armouring heating rod.
Further; The device that gas sampling is heated of the present invention; One section that it is characterized in that constituting said handle (7) is a cavity, and an end face of this cavity is a gland bonnet, is used for sealing wireway; And on gland bonnet, intert heating rod (4) and tempilstick (6), the other end is connected with connecting line (9) through attachment plug (8).
Further; The device that gas sampling is heated of the present invention is characterized in that said tempilstick (6) is the stainless steel armoured thermocouple, and thermopair partly extend in the wireway (4); Directly contact and the measurement gas temperature, and temperature signal is passed to temperature controller (10).
Further; The device that gas sampling is heated of the present invention; It is characterized in that said outlet nozzle (5) is metal tube or rapid-acting coupling or metal ferrule pneumatic joint; Be fixed on the rear portion of wireway (4), be positioned on the wireway near handle portion, be used for connecting duct gas is delivered to analytical instrument.
Further, the device that gas sampling is heated of the present invention is characterized in that said handle (7) is the handle that usefulness insulation, thermal insulation material are processed.
Further, the device that gas sampling is heated of the present invention is characterized in that said temperature controller (10) is the PID temperature controller, on statistics have shown that screen shows gas temperature and control information, have button to supply the user to set the control temperature simultaneously.
The device that gas sampling is heated of the present invention is through directly placing heating rod in the middle of the gas sampling wireway; Making it directly contact flue gas heats; Fast and effeciently the gas heating in the pipe is arrived design temperature, prevent that tube wall from forming condensate water, avoids the composition in the gas to be dissolved in condensate water and to produce loss; Kept integrality and authenticity, assurance is provided the accuracy of follow-up gas componant and concentration analysis through the gas componant of sampling pipe.
Description of drawings
Fig. 1 is the structural drawing of existing gas sampling heating arrangement;
Fig. 2 is the structural drawing of gas sampling heating arrangement of the present invention;
Fig. 3 is the gas flow synoptic diagram in the gas sampling heating arrangement of the present invention.
Embodiment
For making above-mentioned purpose of the present invention, feature and advantage more obviously understandable, the present invention is done further detailed explanation below in conjunction with accompanying drawing and embodiment.
Fig. 2 is the structural drawing of gas sampling heating arrangement of the present invention; Wherein 1 is that admission piece, 2 is that filtrator, 3 is that heating rod, 4 is that wireway, 5 is that outlet nozzle, 6 is that tempilstick, 7 is that handle, 8 is that attachment plug, 9 is that connecting line, 10 is a temperature controller.The present invention directly places heating rod 4 in the middle of the gas sampling wireway 4; Pass the wireway center, an end stretches out wireway, gets in the filtrator cylinder in the admission piece; The other end is fixed in the handle; Make it directly contact flue gas and heat, the concrete form of heating rod 3 does not limit at this, and those skilled in the art can adopt various forms to realize.Wireway 4 is anticorrosion stainless-steel tube or polyfluortetraethylene pipe, and an end has external thread, is tightly connected with admission piece 1, and other end sealing and fixing is on handle 7.
In addition; The present invention carries out PID control heating through 10 pairs of heating rods of temperature controller 3; (that is: temperature controller control is opened and is energized to heating rod, the i.e. heating of heating rod energising, and the temperature sensor that is positioned at the wireway inwall feeds back to temperature controller with the temperature signal of measuring; Temperature controller is according to the signal adjustment of feedback conduction time to heating rod, and then control heating rod intensity that gas is heated) so that the gas temperature in the wireway reach and remain on set definite value.The concrete realization is at wireway 4 set inside tempilsticks; Be used for measuring in real time wireway 4 gas inside temperature; And the temperature parameter of gathering fed back to temperature controller 10 through connecting line 9; And then temperature controller 10 is according to the "on" position of the temperature value control of setting to heating rod 4, thereby realizes the temperature of adjustment wireway 4 internal gas.
Preferably, admission piece 1 is the short tube of a stainless steel, and an end is the beginning of whole device air inlet for the wedge-like mouth, and the other end has internal thread, adorns a filtrator cylindraceous in the tube, is used for the dust of filtering gas.Admission piece covers on the outside of filtrator 2, is connected with wireway 4 through internal thread, is used for protecting filtrator 2.Admission piece is tightly connected through internal thread and wireway.Can pull down admission piece changes or filter rinsed.
Preferably, said filtrator 2 is the cylinder of teflon or pottery or stainless steel material, is placed in the admission piece, is positioned at wireway 4 fronts, is used for solid or gluey particulate in the filtering gas.
Preferably, said heating rod 3 is a stainless steel armouring heating rod, is placed in the wireway 4, runs through from admission piece 1 to outlet nozzle 5 wireway entire portion, is used to heat the gas in the wireway.
Constituting 7 one sections on said handle is a cavity, and an end face of this cavity is a gland bonnet, is used for sealing wireway, and on gland bonnet, interts heating rod 4 and tempilstick 6, and the other end is connected with connecting line 9 through attachment plug 8, and said cavity is a cylindrical cavity.
Preferably, said tempilstick 6 is the stainless steel armoured thermocouple, and thermopair partly extend in the wireway 4, directly contacts and the measurement gas temperature, and temperature signal is passed to temperature controller 10.
Preferably, said outlet nozzle 5 is metal tube or rapid-acting coupling or metal ferrule pneumatic joint, is fixed on the rear portion of wireway, is positioned on the wireway near handle portion, is used for connecting duct gas is delivered to analytical instrument or other devices.
Preferably; Said handle 7 is the handle that usefulness insulation, thermal insulation material are processed; Front end connects wireway 4, and there is attachment plug 8 rear end, is connected with temperature controller 10 with cable; Give temperature controller to the heating rod power supply with the signal feedback of tempilstick, the heating power supply line of heating rod and the signal wire of tempilstick all are connected with the plug that is positioned at the handle rear portion.
Said temperature controller 10 is the PID temperature controller, on statistics have shown that screen shows gas temperature and control information, have button to supply the user to set the control temperature simultaneously.Temperature controller is connected to the attachment plug 8 on the handle by cable.PID control and transformation, mu balanced circuit are arranged in the temperature controller, display displays temperature, state and setup parameter are arranged outward.Other has button to supply operating personnel to set the heating target temperature.Through linking the cable of handle, the heating frequency of temperature controller control heating rod is accepted the feedback signal of tempilstick simultaneously, implement device add heat control.
Fig. 3 is the gas flow synoptic diagram in the gas sampling heating arrangement of the present invention.As can be seen from the figure since with heating rod as for wireway inside, gas sampling heating rod around flow through, make gas sampling fully contact with heating rod.
Generally take heater strip or heating tape are wrapped in the outer gas sampling type of heating that is carried out of wireway with respect to prior art, i.e. indirect heating method, major advantage of the present invention is:
1) owing to the direct contact with gas of heating rod, firing rate is accelerated greatly.Adopt the heating rod and the heater strip of equal-wattage, heat all the same wireway of diameter, wall thickness and length respectively, internal gas reaches the time of same temperature, and the direct heating means of heating rod are twined fast 5 times of outer heating means speed than heater strip.
2) under the equal-wattage, the time that reaches design temperature is short, so efficient is high, more power saving.
3) directly heat sample gas because of heating rod, temperature sensor is also directly measured the temperature of appearance gas, so temperature control is more stable and accurately, it is little to fluctuate.
4) because heating rod can reach in the filter cartridge, the heating of filtrator is carried out and can be realized easily.This just is difficult to realize for the mode that twines heater strip or heating tape outward.
5) because heating rod directly heats, do not have complicated procedures of forming such as heater strip winding, insulation, insulation, adopt the device assembles of this method simple, firm in structure, operation stability is strong, and is also more reliable.
Adopt the instrument of the inventive method and structure to pass through long-term different on-the-spot test, comprise that power plant boiler, heating boiler, petroleum chemical enterprise's production are with boiler etc.Test result has all confirmed above-mentioned advantage of the present invention.In concrete process of the test; We are with Beijing thermal power plant boiler fume emission mouth; Environment temperature is 65 ℃ for the 100C flue-gas temperature, and boiler adopts wet desulphurization, and the environment that smoke moisture is high is tested; Compare with traditional indirect heating mode heating arrangement, specifically relatively setting up procedure is following:
1) constructional device of the present invention is set 120 ℃ of identical temperature values with reference instrument;
2) with present device and the energized start simultaneously of reference equipment;
3) temperature displayed on the temperature controller of two devices of observation;
4) constructional device of the present invention temperature in 3 minutes just arrives 120 ℃, the temperature of reference instrument arrive 120 ℃ for up to 15 minutes;
5) apparatus of the present invention and reference instrument are put into the flue test port simultaneously, the temperature of observing two temperature controllers shows.Apparatus of the present invention are stabilized in 120 ℃ ± 1 ℃ always; And reference instrument is always 120 ℃ ± 5 ℃ variations.
Can draw according to contrast, adopt apparatus and method of the present invention can heat sample gas more apace and also more accurately and stably remain on design temperature with making gas.
Should be noted that at last: above embodiment is only in order to technical scheme of the present invention to be described but not to its restriction; Although with reference to preferred embodiment the present invention has been carried out detailed explanation, the those of ordinary skill in affiliated field is to be understood that: still can specific embodiments of the invention make amendment or the part technical characterictic is equal to replacement; And not breaking away from the spirit of technical scheme of the present invention, it all should be encompassed in the middle of the technical scheme scope that the present invention asks for protection.
Claims (9)
1. device that gas sampling is heated comprises: admission piece (1), filtrator (2), heating rod (3), wireway (4), outlet nozzle (5), tempilstick (6), handle (7), attachment plug (8), connecting line (9), temperature controller (10), wherein; Wireway and admission piece (1) are tightly connected; Other end sealing and fixing is on handle (7), and wireway (4) set inside tempilstick (6) is used for measuring in real time wireway (4) gas inside temperature; And the temperature parameter of gathering fed back to temperature controller (10) through connecting line (9); And then temperature controller (10) is according to the "on" position of the temperature value control of setting to heating rod (3), thereby realizes the temperature of adjustment wireway (4) internal gas, it is characterized in that heating rod (3) directly places in the middle of the gas sampling wireway (4); Pass wireway (4) center; One end stretches out wireway, gets in the filtrator cylinder in the admission piece (1), and the other end is fixed in the handle (7).
2. the device that gas sampling is heated according to claim 1 is characterized in that wireway (4) is anticorrosion stainless-steel tube or polyfluortetraethylene pipe.
3. the device that gas sampling is heated according to claim 1 is characterized in that the cylinder of said filtrator (2) for teflon or pottery or stainless steel material.
4. the device that gas sampling is heated according to claim 1 is characterized in that said heating rod (3) is a stainless steel armouring heating rod.
5. the device that gas sampling is heated according to claim 1; One section that it is characterized in that constituting said handle (7) is a cavity; One end face of this cavity is a gland bonnet; Be used for sealing wireway, and on gland bonnet, intert heating rod (4) and tempilstick (6), the other end is connected with connecting line (9) through attachment plug (8).
6. the device that gas sampling is heated according to claim 1; It is characterized in that said tempilstick (6) is the stainless steel armoured thermocouple; Thermopair partly extend in the wireway (4), directly contacts and the measurement gas temperature, and temperature signal is passed to temperature controller (10).
7. the device that gas sampling is heated according to claim 1; It is characterized in that said outlet nozzle (5) is metal tube or rapid-acting coupling or metal ferrule pneumatic joint; Be fixed on the rear portion of wireway (4); Be positioned on the wireway near handle portion, be used for connecting duct gas is delivered to analytical instrument.
8. the device that gas sampling is heated according to claim 1 is characterized in that said handle (7) is the handle that usefulness insulation, thermal insulation material are processed.
9. the device that gas sampling is heated according to claim 1 is characterized in that said temperature controller (10) is the PID temperature controller, on statistics have shown that screen shows gas temperature and control information, have button to supply the user to set the control temperature simultaneously.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101337668A CN102721599A (en) | 2012-05-03 | 2012-05-03 | Heating device for gas sampling |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012101337668A CN102721599A (en) | 2012-05-03 | 2012-05-03 | Heating device for gas sampling |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105203471A (en) * | 2014-06-21 | 2015-12-30 | 青岛理工大学 | Novel flue gas tester |
| CN105486818A (en) * | 2015-12-31 | 2016-04-13 | 郑州光力科技股份有限公司 | Standard gas preheating type online calibration device |
| CN107655725A (en) * | 2017-09-15 | 2018-02-02 | 苏州西热节能环保技术有限公司 | A kind of super low concentration particle sampling pipette tips suitable for low temperature and high relative humidity environment |
| CN108120622A (en) * | 2017-12-14 | 2018-06-05 | 北京航天易联科技发展有限公司 | It is a kind of can dust-proof heating gas sampling assembly |
| CN109163944A (en) * | 2018-09-26 | 2019-01-08 | 苏州曼德克光电有限公司 | A kind of sampler of Multi-stage heating |
| CN113916610A (en) * | 2020-07-10 | 2022-01-11 | 河北工业大学 | Fixed source heavy metal sampling device and using method thereof |
| CN115389278A (en) * | 2021-05-25 | 2022-11-25 | 江苏省环境科学研究院 | Sampling technology for VOCs vacuum box of unmanned aerial vehicle fixed pollution source |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105203471A (en) * | 2014-06-21 | 2015-12-30 | 青岛理工大学 | Novel flue gas tester |
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| CN109163944A (en) * | 2018-09-26 | 2019-01-08 | 苏州曼德克光电有限公司 | A kind of sampler of Multi-stage heating |
| CN113916610A (en) * | 2020-07-10 | 2022-01-11 | 河北工业大学 | Fixed source heavy metal sampling device and using method thereof |
| CN115389278A (en) * | 2021-05-25 | 2022-11-25 | 江苏省环境科学研究院 | Sampling technology for VOCs vacuum box of unmanned aerial vehicle fixed pollution source |
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Application publication date: 20121010 |