CN103575567B - Based on the flying dust continuous sampling system of emission spectroscopy measurements technology - Google Patents
Based on the flying dust continuous sampling system of emission spectroscopy measurements technology Download PDFInfo
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Abstract
A kind of flying dust continuous sampling system based on emission spectroscopy measurements technology, comprise sampling gun, gas-solid separating device, measurement mechanism and negative pressure shape apparatus for converting, sampling gun one end is installed in flue, the other end is connected with gas-solid separating device, gas-solid separating device comprises weary gas port and powder falling mouth, and measurement mechanism top is connected with tripping device powder falling mouth, and bottom is provided with variable valve, variable valve is connected with negative pressure shape apparatus for converting, and weary gas port is connected with negative pressure shape apparatus for converting by blast pipe.So, two outlets of gas-solid separating device are connected with negative pressure shape apparatus for converting, improve the separation efficiency of gas-solid separating device, add the reliability that Laser-induced Breakdown Spectroscopy method detects fume duct fly ash composition.
Description
Technical field
The present invention relates to boiler fly ash pick-up unit technical field, particularly relate to a kind of flying dust continuous sampling system based on emission spectroscopy measurements technology.
Background technology
In the flying dust of coal-fired power station boiler flue, the content of contained uncompleted burned carbon element is an important indicator of measures filtration burning efficiency.The on-line measurement of unburned carbon in flue dust is significant for the level of adjustment boiler operatiopn in real time.
Flying marking quantity measuring method mainly microwave carbon determination method and the quick calcination loss method applied at present.Microwave carbon determination method, comparatively large by the impact of coal type change on the measuring accuracy of unburned carbon in flue dust, and the coal type change of current domestic power plant is comparatively large, Gu user is difficult to the operational factor adjusting boiler according to the measurement result of the method.Quick calcination loss method is not by the impact of coal type change, but apparatus structure is complicated, and failure rate is high, and industrial environment complex effects is to its reliable and stable work.
Laser action after LIBS focuses on is on measured matter, the characteristic spectral line of representative element content is there is after measured object ablation, gasification, the information such as measured object component content are obtained by Collection and analysis characteristic spectral line, and continuous particulate a fluid stream is formed to powdery Fly ash sampling, and directly measure for particle a fluid stream and can improve LIBS and be applied to the reliability detecting flyash ingredient.And in industry spot, power plant's fume duct fly ash exists with dilute phase liquid form, the sampling of sampling system traditionally cannot reach the requirements such as stable, the concentration utilizing Laser-induced Breakdown Spectroscopy directly to measure.
Summary of the invention
Based on this, be necessary to provide a kind of serial sampling and the flying dust continuous sampling system based on emission spectroscopy measurements technology of the close phase particle a fluid stream of continous-stable is provided.
A kind of flying dust continuous sampling system based on emission spectroscopy measurements technology, comprise sampling gun, gas-solid separating device, measurement mechanism and negative pressure shape apparatus for converting, described sampling gun one end is installed in flue, the other end is connected with described gas-solid separating device, described gas-solid separating device comprises weary gas port and powder falling mouth, described measurement mechanism top is connected with tripping device powder falling mouth, bottom is provided with variable valve, described variable valve is connected with described negative pressure shape apparatus for converting, and described weary gas port is connected with described negative pressure shape apparatus for converting by blast pipe.
Wherein in an embodiment, described sampling gun one end be arranged in flue is provided with taper sample tap, and described taper sample tap is towards flying dust direction of motion.
Wherein in an embodiment, the scope of described taper sample tap angle of taper is 30 ~ 60 degree.
Wherein in an embodiment, also comprise differential pressure measurement device, comprising:
First static tube, the second static tube and differential pressure pickup, described differential pressure pickup is connected with described first static tube and the second static tube respectively, described first static tube is installed in flue, and described second static tube is installed on the gun barrel wall of described sampling gun near gas-solid separating device.
Wherein in an embodiment, described measurement mechanism comprises collecting the gray bottle, and described collecting the gray bottle offers laser measurement window, and described laser measurement window is provided with plated film laser window.
Wherein in an embodiment, described variable valve and weary gas port are connected to described negative pressure shape apparatus for converting by three-way pipe, described three-way pipe comprises the first arm, the second arm and supervisor, described variable valve is connected to the first arm, described weary gas port is connected to the second arm, and described supervisor is connected with described negative pressure shape apparatus for converting.
Wherein in an embodiment, described first arm and the second arm angle are less than 60 degree.
Wherein in an embodiment, described negative pressure shape apparatus for converting comprises thrower, the air pressure draw, electric proportional-regulation valve, hand valve and air compression plant, described variable valve is connected with described thrower with weary gas port, described thrower is connected with described air compression plant by the described air pressure draw, and the described air pressure draw is provided with described electric proportional-regulation valve and hand valve successively away from the direction of described thrower.
Wherein in an embodiment, also comprise counter sample rifle, described counter sample rifle one end is connected with described negative pressure shape apparatus for converting, and the other end is arranged in flue.
Wherein in an embodiment, the rifle head flying dust direction of motion dorsad of described counter sample rifle.
The above-mentioned flying dust continuous sampling system based on emission spectroscopy measurements technology, the weary gas port of gas-solid separator is connected with negative pressure shape apparatus for converting, and powder falling mouth is connected with negative pressure shape apparatus for converting through measurement mechanism, is provided with variable valve bottom measurement mechanism.So, two outlets of gas-solid separating device are connected with negative pressure shape apparatus for converting, improve the separation efficiency of gas-solid separating device, fly ash granule is rapidly and efficiently separated with weary gas, make tested fly ash granule a fluid stream continuous, stable and add its concentration, thus improve the reliability that Laser-induced Breakdown Spectroscopy method detects fume duct fly ash composition; Variable valve is provided with bottom measurement mechanism, by regulating and controlling valve, the fly ash granule in measurement mechanism is piled up, form the mobile equilibrium of buildup post, and then regulate the drag size of measuring junction and negative pressure shape apparatus for converting, when buildup post reach a certain height, further increase the separation efficiency of gas-solid separating device, add the concentration of tested flying dust, add the reliability that Laser-induced Breakdown Spectroscopy method detects fume duct fly ash composition.
Accompanying drawing explanation
Fig. 1 is the structural representation of the flying dust continuous sampling system based on emission spectroscopy measurements technology of an embodiment.
Embodiment
For the ease of understanding the present invention, below with reference to relevant drawings, the present invention is described more fully.Preferred embodiment of the present invention is given in accompanying drawing.But the present invention can realize in many different forms, is not limited to embodiment described herein.On the contrary, provide the object of these embodiments be make the understanding of disclosure of the present invention more comprehensively thorough.
It should be noted that, when element is called as " being fixed on " another element, directly can there is element placed in the middle in it on another element or also.When an element is considered to " connection " another element, it can be directly connected to another element or may there is centering elements simultaneously.Term as used herein " vertical ", " level ", "left", "right" and similar statement are just for illustrative purposes.
Unless otherwise defined, all technology used herein and scientific terminology are identical with belonging to the implication that those skilled in the art of the present invention understand usually.The object of term used in the description of the invention herein just in order to describe specific embodiment, is not intended to be restriction the present invention.Term as used herein " and/or " comprise arbitrary and all combinations of one or more relevant Listed Items.
As shown in Figure 1, based on the flying dust continuous sampling system of emission spectroscopy measurements technology, comprise sampling gun 110, gas-solid separating device 120, measurement mechanism 130 and negative pressure shape apparatus for converting 140.
Sampling gun 110 one end is installed in flue, the other end is connected with gas-solid separating device 120, gas-solid separating device 120 comprises weary gas port 122 and powder falling mouth 124, measurement mechanism 130 top is connected with the powder falling mouth 124 of gas-solid separating device 120, bottom is provided with variable valve 150, variable valve 150 is connected with negative pressure shape apparatus for converting 140, and weary gas port 122 is connected with negative pressure shape apparatus for converting 140 by blast pipe.
Sampling gun 110 one end is arranged in flue, and the other end is communicated with gas-solid separating device 130.
In the present embodiment, can be provided with ball valve 112 at sampling gun 110 near the part of gas-solid separating device 130 and also can be provided with other devices as electrovalve, the control by ball valve 112 regulates the speed of sampling thus is convenient to realize continuous isokinetic sampling.Be understandable that, sampling gun 110 can adopt stainless-steel tube that other materials also can be adopted to make, as long as realize bearing temperature higher in flue, also has the object that certain intensity is convenient to site layout project.
Gas-solid separating device 120 comprises weary gas port 122 and powder falling mouth 124, and weary gas port 122 is connected with negative pressure shape apparatus for converting 140 by blast pipe, and powder falling mouth 124 is connected with measurement mechanism 130.
In the present embodiment, gas-solid separating device 120 can be cyclone type gas-solid separator, comprise weary gas port 122 and powder falling mouth 124, weary gas port 122 is positioned at the top of gas-solid separating device 120, powder falling mouth 124 is positioned at the below of gas-solid separator 120, due to centrifugal and effect that is gravity, flying dust is divided into fly ash granule and weary gas, fly ash granule enters measurement mechanism 130 by powder falling mouth 124, and weary gas enters negative pressure shape apparatus for converting 140 by weary gas port 122.
Measurement mechanism 130 top is connected with the powder sinking tube 124 of gas-solid separator 120, and bottom is provided with variable valve 150, and variable valve 150 is connected with negative pressure shape apparatus for converting 140.
In the present embodiment, measurement mechanism 130 comprises collecting the gray bottle 132, and the side opening of collecting the gray bottle 132 is provided with laser measurement window 134, laser measurement window 134 is provided with plated film laser window.Collecting the gray bottle 132 is connected with the powder falling mouth 124 of gas-solid separator 120 by powder sinking tube, fly ash granule can be fallen and enter collecting the gray bottle 132, play the effect of the storage of fly ash granule.In industry spot, usually adopt laser instrument to measure, the side opening of collecting the gray bottle 132 is provided with laser measurement window 134, and laser measurement window 134 is provided with plated film laser window, so that laser instrument carries out composition detection by plated film laser window to flying dust.
Variable valve 150 is provided with in the bottom of collecting the gray bottle 132, variable valve 150 is connected with negative pressure shape apparatus for converting 140, by regulating and controlling valve 150, the fly ash granule fallen from gas-solid separating device 120 is piled up, and form the mobile equilibrium of buildup post, thus keep the fly ash granule in collecting the gray bottle 132 to keep certain concentration, meet the requirement of the stable and concentration utilizing Laser-induced Breakdown Spectroscopy directly to measure, add Measurement reliability and representativeness.
Negative pressure shape apparatus for converting 140 is connected with variable valve 150, is connected with weary gas port 122 by blast pipe.
In the present embodiment, negative pressure shape apparatus for converting 140 comprises thrower 142, the air pressure draw 144, electric proportional-regulation valve 146, hand valve 148 and external air compression plant (not shown).Thrower 142 is hollow structure, and containing a jet blower, and containing three interfaces, the weary gas port 122 of gas-solid separating device 120 and variable valve 150 are all by a wherein orifice.Another interface of thrower 142 is connected with the air pressure draw 144, and the air pressure draw 144 is connected with external air compression plant, and the air pressure draw 144 is provided with electric proportional-regulation valve 146 and hand valve 148 successively away from the direction of thrower 142.
Be understandable that, electric proportional-regulation valve 146 and hand valve 148 also can not be arranged, realize the control object to compressed-air actuated speed and flow by control air compression plant, change the suction force of negative pressuren zone and the pressure reduction of sampling gun 110 sections, to realize the object of constant speed, stable sampling.Air compression plant can be air exhauster also can be vacuum pump, as long as realize the object forming negative pressuren zone.
The above-mentioned flying dust continuous sampling system based on emission spectroscopy measurements technology, negative pressure shape apparatus for converting 140 forms negative pressuren zone, due to the swabbing action of negative pressuren zone, the power of sampling is provided, flying dust in flue enters gas-solid separating device 120 through sampling gun 110, flying dust is separated into fly ash granule and weary gas by gas-solid separating device 120, fly ash granule falls through powder sinking tube 124 and enters measurement mechanism 130, variable valve 150 is provided with bottom measurement mechanism 130, by regulating and controlling valve 150, fly ash granule is piled up in measurement mechanism 130, form buildup post, measurement mechanism 130 pairs of fly ash granule buildup posts are measured.Weary gas port 122 is connected with negative pressure shape apparatus for converting 140 by blast pipe, and variable valve 150 is connected with negative pressure shape apparatus for converting 140, and the weary gas after measurement and fly ash granule are discharged by negative pressure shape apparatus for converting 140.
So, the weary gas port 122 of gas-solid separating device 120 is connected with negative pressuren zone by blast pipe, powder falling mouth 124 is connected with negative pressuren zone by variable valve 150, due to the swabbing action of negative pressuren zone, the separation efficiency of gas-solid separating device 120 is improved, fly ash granule is rapidly and efficiently separated with weary gas, tested fly ash granule a fluid stream continuously, stable and add its concentration, thus improve the reliability that Laser-induced Breakdown Spectroscopy method detects fume duct fly ash composition.And change the weary gas port of traditional row and need independently to pass into measurement flue, decrease the difficulty of site layout project, save cost of layout.
By regulating and controlling valve 150, fly ash granule is piled up in measurement mechanism 130, form buildup post, and reach mobile equilibrium, and then the drag size of adjustable measurement mechanism 130 and negative pressure shape apparatus for converting.When piling up stock column height and reaching a certain height, when the pressure reduction on measurement mechanism 130 and gas-solid separating device 120 top reaches certain particular value, the separation efficiency of gas-solid separating device 120 reaches optimization, make fly ash granule as much as possible fall into measurement mechanism 130 and do not introduce too much weary gas simultaneously, further increase the fly ash granule concentration in measurement mechanism 130, make the method for Laser-induced Breakdown Spectroscopy measure flyash ingredient more reliable.
In addition, by the setting of variable valve 150, not only can ensure that the flying dust accumulation stock column in measurement mechanism 130 reaches certain mobile equilibrium, keep certain concentration, variable valve 150 is connected with negative pressure shape apparatus for converting 140, weary gas port 122 is also connected with negative pressure shape apparatus for converting 140, and the fly ash granule after measurement and weary gas are finally discharged by negative pressure shape apparatus for converting, and system can be sampled by continous-stable.
Refer to Fig. 1, wherein in an embodiment, sampling gun 110 one end be arranged in flue is provided with taper sample tap 114, and taper sample tap 114 is towards flying dust direction of motion.Be understandable that, the number of taper sample tap 114 can be selected according to the layout of flue, as long as realize good flying dust to collect object.By the impact that flue is arranged, the actual flue gas flow rate distribution of Fly ash sampling position, flying dust granularity and concentration are also uneven, because just need total cross-section to sample, could improve samples' representativeness.Multiple sample tap can reduce the actual flue gas flow rate of sampling place, flying dust granularity is different from concentration the uneven impact caused of sampling, and sample tap is tapered and towards flying dust direction of motion, add the collecting amount of flying dust, improves the representativeness of Fly ash sampling.
Wherein in an embodiment, the angle of taper of taper sample tap 114 is 30 ~ 60 degree, if angle of taper is excessive, certain resistance can be produced to flying dust, thus reduce collecting amount and the speed of flying dust, when angle is 30 degree ~ 60 degree, flying dust resistance to flow is less, make flying dust can enter sampling gun by certain speed, improve flying dust collecting amount, improve the representativeness of Fly ash sampling.
Refer to Fig. 1, wherein in an embodiment, the flying dust detection system of LIBS also comprises differential pressure measurement device 160, and differential pressure measurement device 160 comprises the first static tube 162, second static tube 164 and differential pressure pickup 166.Differential pressure pickup 166 one end is connected with the first static tube 162, the other end is connected with the second static tube 164, first static tube 162 is installed in flue, the direction that installation direction flows perpendicular to flying dust, the second static tube 164 is installed vertically on sampling gun 110 on the gun barrel wall of gas-solid separating device 120.
Draw after deliberation, the property calculation formula Δ P=δ of flue
1(ρ V^2)/2, wherein Δ P is flue differential pressure, δ
1for flue resistance coefficient, ρ is smoke density, and V is the velocity of flue gas of sample location.By measuring flue differential pressure, smoke density and the flue gas flow rate of boiler under different load, the characteristics resistance coefficient of sampler scope inner flue can be obtained.According to fluid mechanics principle; after entering flow field law; the resistance coefficient of flue is constant; according to fly ash constant speed sampling theorem; only have when sampling gun 110 muzzle velocity equals flue flow velocity, Fly ash sampling is only accurately, therefore; when the pressure differential of the pressure in flue and sampling gun 110 is equal, can ensure that sampling gun 110 muzzle velocity equals flue flow velocity.Regulate the aperture of electric proportional-regulation valve 146 to make the pressure reduction of flue and sampling gun 110 close to zero by peripheral control unit, realize isokinetic sampling, add reliability and the representativeness of measurement.
Refer to Fig. 1, wherein in an embodiment, the flying dust detection system of LIBS also comprises counter sample rifle 170, counter sample rifle 170 one end is connected with negative pressure shape apparatus for converting 140, one end is arranged in flue, fly ash granule after measurement and weary gas can be returned in flue by counter sample rifle, and system can be sampled by continous-stable.
Particularly, counter sample rifle 170 can be the metal tube of a bending, and one end is connected with an opening of the thrower 142 of negative pressure shape apparatus for converting 140, and kink is muzzle.Counter sample rifle 170 can be provided with ball valve 172 to regulate the discharge capacity of flying dust thus the pressure reduction in control system near the gun barrel of thrower 142.Be understandable that, counter sample rifle 170 can be metal tube and also can be the other materials that higher hardness and intensity is convenient to arrange and make, as long as realize flying dust to flow back to flue, and is convenient to the object of arranging.
Refer to Fig. 1, wherein in an embodiment, the rifle head direction of counter sample rifle 170 is identical with flying dust direction of motion, and namely gun barrel overbending direction is identical with the direction of motion of flying dust.When after measurement, by regulating electric proportional-regulation valve 146, variable valve 150, fly ash granule after ball valve 172 etc. makes measurement and weary gas send flue back to through thrower 142 outlet and ball valve 172, wherein, the overbending direction of one end that counter sample rifle 170 bends is identical with flying dust direction of motion, the fly ash granule in flue and gas can be utilized to be flowing in counter sample rifle 170 muzzle and to form back pressure, thus make counter sample rifle 170 muzzle have certain suction force, thus add the suction force of sampling system, and make the fly ash granule after measurement and weary gas be convenient to get rid of, reduce intrasystem line clogging and realize serial sampling, add stability and the reliability of system, also make system can serial sampling and measurement.
Refer to Fig. 1, wherein in an embodiment, variable valve 150 and weary gas port 122 are connected to negative pressure shape apparatus for converting 140 by three-way pipe, three-way pipe comprises the first arm and the second arm and supervisor, variable valve 150 is connected to the first arm, blast pipe is connected to the second arm, and supervisor is connected with an interface of the jet blower 142 of negative pressure shape apparatus for converting 140.
So, when measuring, fly ash granule in the collecting the gray bottle 132 of measurement mechanism 130 enters the first arm by variable valve 150, weary gas enters the second arm by blast pipe, then fly ash granule and weary gas merge supervisor, the fly ash granule making concentration larger becomes dilute phase liquid form to be existed, enter the interface of jet blower 142, thus flow back to flue by counter sample rifle 170, avoid fly ash granule and directly enter jet blower and weary gas mixes the gambling plug that may cause, fly ash granule is also made to become dilute phase flowing, accelerate the eliminating of the fly ash granule after measuring, system can be sampled by continuous circulation.
Wherein in an embodiment, the angle of the first arm and the second arm is less than 60 degree, and the first arm and the second arm are with the center line Central Symmetry of supervisor.The angle of the first arm and the second arm is less than 60 degree, can reduce the resistance of arm to fly ash granule and weary gas, accelerates it and gets rid of, reduce intrasystem line clogging, add stability and the reliability of system, also makes system can serial sampling and measurement.
The above embodiment only have expressed several embodiment of the present invention, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.
Claims (9)
1. the flying dust continuous sampling system based on emission spectroscopy measurements technology, it is characterized in that, comprise sampling gun, gas-solid separating device, measurement mechanism and negative pressure shape apparatus for converting, described sampling gun one end is installed in flue, the other end is connected with described gas-solid separating device, described gas-solid separating device comprises weary gas port and powder falling mouth, described measurement mechanism top is connected with gas-solid separating device powder falling mouth, bottom is provided with variable valve, described variable valve is connected with described negative pressure shape apparatus for converting, by regulating and controlling valve, the fly ash granule fallen from gas-solid separating device is piled up, and form the mobile equilibrium of buildup post, described weary gas port is connected with described negative pressure shape apparatus for converting by blast pipe, described variable valve and weary gas port are connected to described negative pressure shape apparatus for converting by three-way pipe, described three-way pipe comprises the first arm, second arm and supervisor, described variable valve is connected to the first arm, described weary gas port is connected to the second arm, described supervisor is connected with described negative pressure shape apparatus for converting.
2. the flying dust continuous sampling system based on emission spectroscopy measurements technology according to claim 1, is characterized in that, described sampling gun one end be arranged in flue is provided with taper sample tap, and described taper sample tap is towards flying dust direction of motion.
3. the flying dust continuous sampling system based on emission spectroscopy measurements technology according to claim 2, is characterized in that, the scope of described taper sample tap angle of taper is 30 ~ 60 degree.
4. the flying dust continuous sampling system based on emission spectroscopy measurements technology according to claim 1, is characterized in that, also comprise differential pressure measurement device, comprising:
First static tube, the second static tube and differential pressure pickup, described differential pressure pickup is connected with described first static tube and the second static tube respectively, described first static tube is installed in flue, and described second static tube is installed on the gun barrel wall of described sampling gun near gas-solid separating device.
5. the flying dust continuous sampling system based on emission spectroscopy measurements technology according to claim 1, it is characterized in that, described measurement mechanism comprises collecting the gray bottle, and described collecting the gray bottle offers laser measurement window, and described laser measurement window is provided with plated film laser window.
6. the flying dust continuous sampling system based on emission spectroscopy measurements technology according to claim 1, is characterized in that, described first arm and the second arm angle are less than 60 degree.
7. the flying dust continuous sampling system based on emission spectroscopy measurements technology according to claim 1, it is characterized in that, described negative pressure shape apparatus for converting comprises thrower, the air pressure draw, electric proportional-regulation valve, hand valve and air compression plant, described variable valve is connected with described thrower with weary gas port, described thrower is connected with described air compression plant by the described air pressure draw, and the described air pressure draw is provided with described electric proportional-regulation valve and hand valve successively away from the direction of described thrower.
8. the flying dust continuous sampling system based on emission spectroscopy measurements technology according to claim 1 ~ 7 any one, it is characterized in that, also comprise counter sample rifle, one end that described counter sample rifle is provided with rifle head is arranged in flue, and the one end away from rifle head is connected with described negative pressure shape apparatus for converting.
9. according to claim 8 based on the flying dust continuous sampling system of emission spectroscopy measurements technology, it is characterized in that, the rifle head flying dust direction of motion dorsad of described counter sample rifle.
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| CN105527255A (en) * | 2016-01-20 | 2016-04-27 | 华南理工大学 | On-line monitoring system of coal characteristics of as-fired coal |
| CN105717075B (en) * | 2016-03-31 | 2019-03-15 | 四川大学 | A kind of excitation apparatus and test method of particulate material heavy metal element |
| CN107063945A (en) * | 2016-12-17 | 2017-08-18 | 广州敏远能源科技有限公司 | A kind of boiler coal-ash fineness on-line measurement apparatus and method based on image procossing |
| CN107101918A (en) * | 2017-05-18 | 2017-08-29 | 浙江大学 | A kind of grain graininess on-line measurement system |
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