CN103575567A - Continuous flying ash sampling device based on emission spectrum measuring technology - Google Patents
Continuous flying ash sampling device based on emission spectrum measuring technology Download PDFInfo
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- CN103575567A CN103575567A CN201310526927.4A CN201310526927A CN103575567A CN 103575567 A CN103575567 A CN 103575567A CN 201310526927 A CN201310526927 A CN 201310526927A CN 103575567 A CN103575567 A CN 103575567A
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Abstract
The invention discloses a continuous flying ash sampling device based on an emission spectrum measuring technology. The continuous flying ash sampling device comprises a sampling gun, a gas-solid separation device, a measuring device and a negative pressure forming device, wherein one end of the sampling gun is arranged in a flue, and the other end of the sampling gun is connected with the gas-solid separation device; the gas-solid separation device comprises an exhaust hole and a powder falling hole; the top of the measuring device is connected with the powder falling hole of the gas-solid separation device; a regulating valve is arranged at the bottom of the measuring device and is connected with the negative pressure forming device; the exhaust hole is connected with the negative pressure forming device through an exhaust pipe. Therefore, the two outlets of the gas-solid separation device are connected with the negative pressure forming device, the separation efficiency of the gas-solid separation device is improved, and the reliability of detection on components of flying ash in the flue through a laser-induced breakdown spectroscopy method is improved.
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 weighing filtration combustion efficiency.The on-line measurement of unburned carbon in flue dust is significant for real-time adjustment boiler operatiopn level.
The unburned carbon in flue dust detection method of having applied is at present mainly microwave carbon determination method and quick calcination loss method.Microwave carbon determination method, be subject to the impact of coal type change larger, and the coal type change of current domestic power plant is larger on the measuring accuracy of unburned carbon in flue dust, Gu user is difficult to adjust according to the measurement result of the method the operational factor of boiler.Calcination loss method is not subject to the impact of coal type change fast, 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 Laser-induced Breakdown Spectroscopy technology use focuses on is on measured matter, after measured object ablation, gasification, there is the characteristic spectral line of representative element content, by Collection and analysis characteristic spectral line, obtain the information such as measured object component content, and powdery Fly ash sampling is formed to continuous particulate a fluid stream, and direct measurement can improve the reliability that Laser-induced Breakdown Spectroscopy technology is applied to detect flyash ingredient for particle a fluid stream.And in industry spot, power plant's fume duct fly ash exists with dilute phase liquid form, according to the sampling of traditional sampling system, cannot reach the requirements such as utilize that Laser-induced Breakdown Spectroscopy directly measures stable, concentration.
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.
In an embodiment, one end that described sampling gun is arranged in flue is provided with taper sample tap therein, and described taper sample tap is towards flying dust direction of motion.
In an embodiment, the scope of described taper sample tap angle of taper is 30～60 degree therein.
In an embodiment, also comprise differential pressure measurement device therein, comprising:
The first static tube, the second static tube and differential pressure pickup, described differential pressure pickup is connected with the second static tube with described the first static tube respectively, described the first static tube is installed in flue, and described the second static tube is installed on described sampling gun near the gun barrel wall of gas-solid separating device.
In an embodiment, described measurement mechanism comprises collecting the gray bottle therein, and described collecting the gray bottle offers laser measurement window, and described laser measurement window is provided with plated film laser window.
Therein in an embodiment, described variable valve and weary gas port are connected in 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 in the first arm, described weary gas port is connected in the second arm, and described supervisor is connected with described negative pressure shape apparatus for converting.
In an embodiment, described the first arm and the second arm angle are less than 60 degree therein.
Therein 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.
In an embodiment, also comprise counter sample rifle therein, described counter sample rifle one end is connected with described negative pressure shape apparatus for converting, and the other end is arranged in flue.
In an embodiment, the rifle head of described counter sample rifle is flying dust direction of motion dorsad therein.
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, and measurement mechanism bottom is provided with variable valve.So, two outlets of gas-solid separating device are connected with negative pressure shape apparatus for converting, improved the separation efficiency of gas-solid separating device, make fly ash granule rapidly and efficiently separated with weary gas, make tested fly ash granule a fluid stream continuously, stable and increased its concentration, thereby improved the reliability that Laser-induced Breakdown Spectroscopy method detects fume duct fly ash composition; Measurement mechanism bottom is provided with variable valve, by regulating and controlling valve, the fly ash granule in measurement mechanism is piled up, form the mobile equilibrium of buildup post, and then the drag size of adjusting measuring junction and negative pressure shape apparatus for converting, when buildup post reach a certain height, further improve the separation efficiency of gas-solid separating device, increased the concentration of tested flying dust, increased the reliability of Laser-induced Breakdown Spectroscopy method detection 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.In accompanying drawing, provided preferred embodiment of the present invention.But the present invention can realize in many different forms, be not limited to embodiment described herein.On the contrary, providing the object of these embodiment is to make to the understanding of disclosure of the present invention more thoroughly comprehensively.
It should be noted that, when element is called as " being fixed on " another element, can 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 have centering elements simultaneously.Term as used herein " vertical ", " level ", " left side ", " right side " and similar statement are just for illustrative purposes.
Unless otherwise defined, all technology of using are herein identical with the implication that belongs to the common understanding of those skilled in the art of the present invention with scientific terminology.The term using in instructions of the present invention herein, just in order to describe the object of specific embodiment, is not intended to be restriction the present invention.Term as used herein " and/or " comprise one or more relevant Listed Items arbitrarily with all combinations.
As shown in Figure 1, the flying dust continuous sampling system based on emission spectroscopy measurements technology, comprises sampling gun 110, gas-solid separating device 120, measurement mechanism 130 and negative pressure shape apparatus for converting 140.
Sampling gun 110 one end are 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 tops are 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 are arranged in flue, and the other end is communicated with gas-solid separating device 130.
In the present embodiment, at sampling gun 110, near the part of gas-solid separating device 130, can be provided with ball valve 112 and also can be provided with other devices as electrovalve, thereby can regulate by the control of ball valve 112 speed of sampling to be convenient to realize continuous isokinetic sampling.Be understandable that, sampling gun 110 can adopt stainless-steel tube also can adopt other materials to make, as long as realize, can bear 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 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 tops are 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, and plated film laser window is installed on laser measurement window 134.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, plays the effect of the storage of fly ash granule.In industry spot, conventionally 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.
In the bottom of collecting the gray bottle 132, be provided with variable valve 150, variable valve 150 is connected with negative pressure shape apparatus for converting 140, by regulating and controlling valve 150, the fly ash granule falling from gas-solid separating device 120 is piled up, and form the mobile equilibrium of buildup post, thereby keep the fly ash granule in collecting the gray bottle 132 to keep certain concentration, met and utilized the directly requirement of the stable and concentration of measurement of Laser-induced Breakdown Spectroscopy, increased measurement reliability and representativeness.
Negative pressure shape apparatus for converting 140 is connected with variable valve 150, by blast pipe, is connected with weary gas port 122.
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, contains a jet blower, and contains three interfaces, and the weary gas port 122 of gas-solid separating device 120 and variable valve 150 are all communicated with by an interface wherein.Thrower 142 another interfaces are 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 can not arrange yet, can realize the control object to compressed-air actuated speed and flow by controlling air compression plant, the pressure reduction that the suction force of change negative pressuren zone and sampling gun are 110 sections, to realize the object of constant speed, stable sampling.Air compression plant can be that air exhauster can be also vacuum pump, as long as realize the object that forms 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, swabbing action due to negative pressuren zone, the power of sampling is provided, flying dust in flue enters gas-solid separating device 120 through sampling gun 110, gas-solid separating device 120 is separated into fly ash granule and weary gas by flying dust, fly ash granule falls by powder sinking tube 124 and enters measurement mechanism 130, measurement mechanism 130 bottoms are provided with variable valve 150, by regulating and controlling valve 150, make fly ash granule in 130 li of accumulations of measurement mechanism, form buildup post, 130 pairs of fly ash granule buildup posts of measurement mechanism 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, swabbing action due to 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, and tested fly ash granule a fluid stream is continuous, stable and increased its concentration, thereby has improved the reliability of Laser-induced Breakdown Spectroscopy method detection fume duct fly ash composition.And having changed the weary gas port of traditional row needs independently to pass into measurement flue, has reduced the difficulty of site layout project, has saved cost of layout.
By regulating and controlling valve 150, make fly ash granule in 130 li of accumulations of measurement mechanism, 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 accumulation stock column height reach a certain height, when the pressure reduction on measurement mechanism 130 and gas-solid separating device 120 tops 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 increased the fly ash granule concentration in measurement mechanism 130, made the method measurement flyash ingredient of Laser-induced Breakdown Spectroscopy more reliable.
In addition, by the setting of variable valve 150, not only can guarantee 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, measures fly ash granule and weary gas later and can finally discharge by negative pressure shape apparatus for converting, and system can be sampled by continous-stable.
Refer to Fig. 1, in an embodiment, one end that sampling gun 110 is arranged in flue is provided with taper sample tap 114 therein, 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, collects object.The impact that arranged by flue, actual flue gas flow rate distribution, flying dust granularity and the concentration inhomogeneous of Fly ash sampling position, because just need total cross-section sampling, could improve samples' representativeness.A plurality of sample taps can reduce actual flue gas flow rate, the flying dust granularity impacts that on sample inequality cause different from concentration of sampling place, and sample tap is tapered and towards flying dust direction of motion, increased the collecting amount of flying dust, has improved the representativeness of Fly ash sampling.
Therein in an embodiment, the angle of taper of taper sample tap 114 is 30～60 degree, if angle of taper is excessive, can produce certain resistance to flying dust, thus collecting amount and the speed of flying dust reduced, when angle is that 30 degree～60 are when spend, flying dust resistance to flow is less, make flying dust enter sampling gun by certain speed, improved flying dust collecting amount, improved the representativeness of Fly ash sampling.
Refer to Fig. 1, in an embodiment, the flying dust detection system of Laser-induced Breakdown Spectroscopy technology also comprises differential pressure measurement device 160 therein, and differential pressure measurement device 160 comprises the first static tube 162, the second static tube 164 and differential pressure pickup 166.Differential pressure pickup 166 one end are connected with the first static tube 162, the other end is connected with the second static tube 164, the first static tube 162 is installed in flue, installation direction is perpendicular to the mobile direction of flying dust, and the second static tube 164 at right angle settings are in sampling gun 110 on the gun barrel wall near 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, the velocity of flue gas that V is sample location.By measuring flue differential pressure, smoke density and the flue gas flow rate of boiler under different load, can obtain the characteristics resistance coefficient of sampler scope inner flue.According to fluid mechanics principle; enter behind 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 velocities equal flue flow velocity, Fly ash sampling is only accurately, therefore; when the pressure differential of the pressure in flue and sampling gun 110 equates, can guarantee that sampling gun 110 muzzle velocities equal flue flow velocity.By peripheral control unit, regulate the aperture of electric proportional-regulation valve 146 to make the pressure reduction of flue and sampling gun 110 approach zero, realize isokinetic sampling, increased reliability and the representativeness measured.
Refer to Fig. 1, therein in an embodiment, the flying dust detection system of Laser-induced Breakdown Spectroscopy technology also comprises counter sample rifle 170, counter sample rifle 170 one end are connected with negative pressure shape apparatus for converting 140, one end is arranged in flue, measure fly ash granule and weary gas later and can return in flue by counter sample rifle, 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.Thereby counter sample rifle 170 can be provided with ball valve 172 with the pressure reduction in the discharge capacity control system of adjusting flying dust 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 is flow back to flue, and is convenient to the object of arranging.
Refer to Fig. 1, in an embodiment, the rifle head direction of counter sample rifle 170 is identical with flying dust direction of motion therein, and gun barrel overbending direction is identical with the direction of motion of flying dust.After measuring, by regulating electric proportional-regulation valve 146, variable valve 150, ball valve 172 grades make fly ash granule and the weary gas after measurement send flue back to through thrower 142 outlets and ball valve 172, wherein, the overbending direction of one end of counter sample rifle 170 bendings is identical with flying dust direction of motion, can utilize fly ash granule and gas in flue to be flowing in counter sample rifle 170 muzzle formation back pressures, thereby make counter sample rifle 170 muzzle there is certain suction force, thereby increased the suction force of sampling system, and make fly ash granule and weary gas after measuring be convenient to get rid of, reduce intrasystem line clogging and realize serial sampling, stability and the reliability of system have been increased, also make the system can serial sampling and measurement.
Refer to Fig. 1, therein in an embodiment, variable valve 150 and weary gas port 122 are connected in 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 in the first arm, blast pipe is connected in 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, make the fly ash granule that concentration is larger become the existence of dilute phase liquid form, enter the interface of jet blower 142, thereby flow back to flue by counter sample rifle 170, avoid fly ash granule directly to enter jet blower and weary gas and mixed the gambling plug that may cause, also making fly ash granule become dilute phase form flows, accelerate the eliminating of the fly ash granule after measuring, system can be sampled by continuous circulation.
In an embodiment, the angle of the first arm and the second arm is less than 60 degree therein, and the first arm and the center line Central Symmetry of the second arm to be responsible for.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, and reduces intrasystem line clogging, has increased stability and the reliability of system, also makes the system can serial sampling and measurement.
The above embodiment has only expressed several embodiment of the present invention, and it describes comparatively concrete and detailed, but can not therefore 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 (10)
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, and described weary gas port is connected with described negative pressure shape apparatus for converting by blast pipe.
2. the flying dust continuous sampling system based on emission spectroscopy measurements technology according to claim 1, is characterized in that, one end that described sampling gun is 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 comprises differential pressure measurement device, comprising:
The first static tube, the second static tube and differential pressure pickup, described differential pressure pickup is connected with the second static tube with described the first static tube respectively, described the first static tube is installed in flue, and described the second static tube is installed on described sampling gun near the gun barrel wall of gas-solid separating device.
5. the flying dust continuous sampling system based on emission spectroscopy measurements technology according to claim 1, 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, it is characterized in that, described variable valve and weary gas port are connected in 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 in the first arm, described weary gas port is connected in the second arm, and described supervisor is connected with described negative pressure shape apparatus for converting.
7. the flying dust continuous sampling system based on emission spectroscopy measurements technology according to claim 6, is characterized in that, described the first arm and the second arm angle are less than 60 degree.
8. 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.
9. according to the flying dust continuous sampling system based on emission spectroscopy measurements technology described in claim 1～8 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, away from one end of rifle head, is connected with described negative pressure shape apparatus for converting.
10. the flying dust continuous sampling system based on emission spectroscopy measurements technology according to claim 9, is characterized in that, the rifle head of described counter sample rifle is flying dust direction of motion dorsad.
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| CN114894561A (en) * | 2022-04-28 | 2022-08-12 | 苏州西热节能环保技术有限公司 | Mixed sampling measurement structure with ash removal function and working method thereof |
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Address after: 510080 Dongfeng East Road, Dongfeng, Guangdong, Guangzhou, Zhejiang Province, No. 8 Co-patentee after: South China University of Technology Patentee after: ELECTRIC POWER RESEARCH INSTITUTE, GUANGDONG POWER GRID CO., LTD. Co-patentee after: Shajiao C Power Station of Guangdong Yudean Group Co., Ltd. Address before: 510080 Dongfeng East Road, Dongfeng, Guangdong, Guangzhou, Zhejiang Province, No. 8 Co-patentee before: South China University of Technology Patentee before: Electrical Power Research Institute of Guangdong Power Grid Corporation Co-patentee before: Shajiao C Power Station of Guangdong Yudean Group Co., Ltd. |
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