CN114002027A - Ultrasonic pulverized coal sampling system - Google Patents
Ultrasonic pulverized coal sampling system Download PDFInfo
- Publication number
- CN114002027A CN114002027A CN202111397801.2A CN202111397801A CN114002027A CN 114002027 A CN114002027 A CN 114002027A CN 202111397801 A CN202111397801 A CN 202111397801A CN 114002027 A CN114002027 A CN 114002027A
- Authority
- CN
- China
- Prior art keywords
- ultrasonic
- powder
- coal
- flow
- pulverized coal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000003245 coal Substances 0.000 title claims abstract description 98
- 238000005070 sampling Methods 0.000 title claims abstract description 90
- 239000000843 powder Substances 0.000 claims abstract description 148
- 238000007789 sealing Methods 0.000 claims abstract description 35
- 230000001105 regulatory effect Effects 0.000 claims abstract description 18
- 238000007599 discharging Methods 0.000 claims abstract description 13
- 230000000903 blocking effect Effects 0.000 claims description 40
- 239000002817 coal dust Substances 0.000 claims description 36
- 239000010410 layer Substances 0.000 claims description 25
- 239000003822 epoxy resin Substances 0.000 claims description 8
- 229920000647 polyepoxide Polymers 0.000 claims description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 5
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 5
- 238000007731 hot pressing Methods 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 4
- 229920003229 poly(methyl methacrylate) Polymers 0.000 claims description 4
- 239000004926 polymethyl methacrylate Substances 0.000 claims description 4
- 239000002356 single layer Substances 0.000 claims description 4
- 238000010298 pulverizing process Methods 0.000 abstract description 8
- 238000012545 processing Methods 0.000 abstract description 3
- 235000012431 wafers Nutrition 0.000 description 10
- 230000000694 effects Effects 0.000 description 9
- 238000000034 method Methods 0.000 description 8
- 230000003068 static effect Effects 0.000 description 8
- 238000007664 blowing Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 238000002485 combustion reaction Methods 0.000 description 4
- 230000005484 gravity Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000000565 sealant Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/2247—Sampling from a flowing stream of gas
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/2202—Devices for withdrawing samples in the gaseous state involving separation of sample components during sampling
- G01N1/2205—Devices for withdrawing samples in the gaseous state involving separation of sample components during sampling with filters
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/2247—Sampling from a flowing stream of gas
- G01N2001/225—Sampling from a flowing stream of gas isokinetic, same flow rate for sample and bulk gas
Landscapes
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Molecular Biology (AREA)
- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention discloses an ultrasonic coal powder sampling system, belonging to the field of coal processing, comprising a sampling pipe, an ultrasonic coal powder collector, a regulating valve, an air suction pump, a pressure measuring pipe assembly and a pressure gauge; the ultrasonic coal powder collector comprises an ultrasonic sealing strip, a spoiler, a movable plate, a coal powder collecting box and a shell, and the pressure measuring pipe assembly comprises a first pressure measuring pipe and a second pressure measuring pipe. The sampling pipe is sequentially connected with the ultrasonic pulverized coal collector, the regulating valve and the air pump; the ultrasonic sealing tape is connected with the inner wall of the top of the shell, and the spoiler is provided with a plurality of flow-stopping bulges and an upper powder-discharging hole; the movable plate is positioned between the spoiler and the pulverized coal collecting box, and a plurality of lower pulverized coal discharging holes are formed in the movable plate; one end of the first pressure measuring pipe is positioned in the sampling pipe, and the first pressure measuring pipe and the second pressure measuring pipe are both connected with the pressure gauge; the ultrasonic sealing tape is used to generate ultrasonic waves. The coal powder sampling operation of the direct-fired pulverizing system under the variable working condition can be better realized, and the sampling efficiency is better in the direct-fired pulverizing system under the small-flow working condition.
Description
Technical Field
The invention belongs to the field of coal processing, and relates to an ultrasonic coal powder sampling system.
Background
A thermal power plant represented by coal combustion dominates. Generally, in the process of coal combustion, the finer the fineness of the pulverized coal fed into the furnace, the more complete the combustion, and the higher the boiler combustion efficiency. However, the finer the pulverized coal fineness is, the higher the coal grinding cost is, and the pulverized coal explosion is easily caused. Therefore, the fineness of the pulverized coal needs to be maintained within a reasonable interval. In the operation process of a coal-fired power plant, the fineness of the pulverized coal needs to be measured and analyzed in real time, the optimal interval of the fineness of the pulverized coal is compared according to the measurement result, and the operation condition of a coal pulverizing system is continuously adjusted, so that the whole coal-fired unit can safely operate under the efficient and stable condition.
At present, for a middle storage type coal pulverizing system, a coal powder movable sampling pipe and a coal powder free sampler are often adopted for sampling coal powder. For the direct-fired pulverizing system, a constant-speed sampling system is mainly adopted. The direct-blowing type coal pulverizing system has the advantages of small occupied area, convenience in putting and combining coal mills, high running safety, low coal pulverizing power consumption and the like, but has the defect of uneven distribution of the fineness of coal powder in the coal conveying pipe. Therefore, a movable constant-speed sampling method is usually adopted to obtain accurate information of the fineness of the coal dust in the powder conveying pipe of the direct-fired pulverizing system.
The constant-speed sampling system introduces the airflow in the powder conveying pipe into the sampling pipe by means of air suction, and the pulverized coal is collected by gas-solid separation of the multistage cyclone separator. However, the constant velocity sampling system using the cyclone has the following problems: 1) the constant-speed sampling system using the cyclone separator has higher requirements on the stability and the continuity of the extracted air flow, and the sampling efficiency of the constant-speed sampling system on the pulverized coal is reduced when the flow velocity fluctuation in the powder conveying pipe is larger and the change of the powder outlet flow of the powder making system is obvious; 2) the constant-speed sampling system using the cyclone separator needs to adopt a special miniature cyclone separator under the gas-powder flow with small flow, so that the cost and the complexity of the device are increased, and the sampling effect on the coal powder is not satisfactory.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide an ultrasonic coal powder sampling system.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
an ultrasonic coal powder sampling system comprises a sampling pipe, an ultrasonic coal powder collector, a regulating valve, an air extracting pump, a pressure measuring pipe assembly and a pressure gauge; the ultrasonic coal powder collector comprises an ultrasonic sealing belt, a spoiler, a movable plate, a coal powder collecting box and a shell, and the pressure measuring pipe assembly comprises a first pressure measuring pipe and a second pressure measuring pipe; one end of the sampling pipe is sequentially connected with an ultrasonic pulverized coal collector, a regulating valve and an air pump; the shell is sleeved above the spoiler, the ultrasonic sealing band is connected with the inner wall of the top of the shell, the spoiler is provided with a plurality of flow-resisting bulges, and an upper powder discharge hole is formed between every two adjacent flow-resisting bulges; the movable plate is positioned between the spoiler and the pulverized coal collecting box, and a plurality of lower pulverized coal discharging holes are formed in the movable plate; one end of the first pressure measuring pipe is positioned in the sampling pipe, and the first pressure measuring pipe and the second pressure measuring pipe are both connected with the pressure gauge; the ultrasonic sealing tape is used to generate ultrasonic waves.
Optionally, a filter is arranged between the ultrasonic coal powder collector and the regulating valve.
Optionally, the distance between adjacent flow-resisting protrusions is 10-100 mm, and the thickness of each flow-resisting protrusion is 1-5 mm.
Optionally, the lengths of the upper powder discharge hole and the lower powder discharge hole are not less than 90% of the length of the flow blocking protrusion and not more than the length of the flow blocking protrusion.
Optionally, the total length of gaps between the two side surfaces of the flow blocking protrusion in the length direction and the inner wall surface of the shell is not more than 0.5 mm.
Optionally, the distance between the adjacent upper powder discharge holes is not less than 1.2 times of the width of the upper powder discharge hole, and the distance between the adjacent lower powder discharge holes is not less than 1.2 times of the width of the lower powder discharge hole.
Optionally, at least 7 flow blocking protrusions are provided.
Optionally, the gap between the ultrasonic sealing band and the top of the spoiler is not more than 5 mm.
Optionally, the ultrasonic sealing tape comprises a backing, an acoustic-electric wafer layer, a matching layer and an acoustic lens; one side of the acoustic lens is sequentially connected with the matching layer, the acoustic-electric chip layer, the back lining and the inner wall of the top of the shell.
Optionally, the acoustic-electric wafer layer is composed of a plurality of acoustic-electric wafers which are arranged in series, the frequency range of ultrasonic waves generated by the acoustic-electric wafers is 40-200 kHz, the backing is formed by mixing iron powder and epoxy resin and then hot-pressing, the matching layer is made of epoxy resin which is filled with alumina in a single layer, and the acoustic lens is made of polymethyl methacrylate.
Compared with the prior art, the invention has the following beneficial effects:
the ultrasonic coal powder sampling system comprises a first pressure measuring pipe, a second pressure measuring pipe and a pressure gauge, wherein one end of the first pressure measuring pipe is positioned in the sampling pipe, the first pressure measuring pipe and the second pressure measuring pipe are connected with the pressure gauge, the first pressure measuring pipe and the second pressure measuring pipe are used for measuring the static pressure of the flow of the coal powder inside and outside the sampling pipe, and the opening of the regulating valve is adjusted according to the static pressure, so that the flow speed of the flow of the coal powder inside and outside the sampling pipe is balanced, constant-speed sampling is realized, different flow speeds in the coal powder conveying pipe are adapted, and the coal powder sampling work of the direct-blowing coal powder preparation system under the variable working condition can be better realized. The flow-resisting bulges in the ultrasonic coal dust collector and the ultrasonic sealing strip form a plurality of mutually independent cavities, and the powder plays a role in slowing and stopping the airflow flowing through the ultrasonic coal dust collector. Meanwhile, ultrasonic waves emitted by the ultrasonic sealing strip are combined, secondary flow different from the flow direction of the gas-powder flow can be generated in a sealing gap between the ultrasonic sealing strip and the top of the flow blocking protrusion by means of sound flow phenomenon, the kinetic energy of the gas-powder flow is further dissipated, the slowing effect on the gas-powder flow is enhanced, then the coal powder in the gas-powder flow is settled by means of the gravity action of the coal powder, and the sampling efficiency is better in a direct-blowing type powder preparation system under the working condition of small flow.
Furthermore, a filter is arranged between the ultrasonic coal powder collector and the regulating valve. Residual coal dust in the air-powder flow flowing out of the ultrasonic coal dust collector is collected through the filter, and damage to the regulating valve and the air suction pump caused by coal dust particles is prevented.
Furthermore, the distance between the adjacent flow blocking protrusions is 10-100 mm, the thickness of each flow blocking protrusion is 1-5 mm, and good sampling effect is achieved while material loss and low processing and manufacturing difficulty are guaranteed.
Drawings
FIG. 1 is a schematic structural diagram of an ultrasonic pulverized coal sampling system according to the present invention;
FIG. 2 is a schematic structural view of an ultrasonic coal dust collector of the present invention;
FIG. 3 is a schematic view of a baffle structure of the present invention;
FIG. 4 is a schematic diagram of a movable plate structure according to the present invention;
fig. 5 is a schematic view of the ultrasonic sealing tape structure of the present invention.
Wherein: 1-a sampling tube; 2-a powder conveying pipe; 3-a pipeline; 4-ultrasonic wave coal dust collector; 5-a filter; 6-adjusting the valve; 7-an air pump; 8-a pressure tube assembly; 9-a pressure gauge; 10-ultrasonic sealing tape; 11-a spoiler; 12-upper powder discharging holes; 13-a movable plate; 14-lower powder discharge holes; 15-a pulverized coal collection box; 16-outer shell.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The invention is described in further detail below with reference to the accompanying drawings:
referring to fig. 1 and 2, in an embodiment of the present invention, an ultrasonic coal powder sampling system is provided, including a sampling pipe 1, an ultrasonic coal powder collector 4, a regulating valve 6, an air pump 7, a pressure measuring pipe assembly 8, and a pressure gauge 9; the ultrasonic coal dust collector 4 comprises an ultrasonic sealing strip 10, a spoiler 11, a movable plate 13, a coal dust collecting box 15 and a shell 16, and the pressure measuring pipe assembly 8 comprises a first pressure measuring pipe and a second pressure measuring pipe.
Wherein, one end of the sampling pipe 1 is sequentially connected with an ultrasonic pulverized coal collector 4, a regulating valve 6 and an air pump 7; the shell 16 is sleeved above the spoiler 11, the ultrasonic sealing tape 10 is connected with the inner wall of the top of the shell 16, a plurality of spoiler protrusions are arranged on the spoiler 11, and an upper powder discharge hole 12 is formed between every two adjacent spoiler protrusions; the movable plate 13 is positioned between the spoiler 11 and the pulverized coal collecting box 15, and the movable plate 13 is provided with a plurality of lower pulverized coal discharging holes 14; one end of the first pressure measuring pipe is positioned inside the sampling pipe 1, and the first pressure measuring pipe and the second pressure measuring pipe are both connected with a pressure gauge 9; the ultrasonic sealing tape 10 is used to generate ultrasonic waves.
Specifically, the sampling pipe 1, the ultrasonic coal dust collector 4, the regulating valve 6 and the air pump 7 are connected through a pipeline 3. When the sampling device is used, the inlet end of the sampling pipe 1 faces the incoming flow direction of the gas-powder flow and is placed in the powder conveying pipe 2, the sampling pipe 1 penetrates through an opening in the pipe wall of the powder conveying pipe 2, and the outlet end of the sampling pipe is connected with the inlet of the ultrasonic coal powder collector 4 through the pipeline 3; the first pressure measuring pipe is used for measuring the static pressure outside the sampling pipe 1, one end of the first pressure measuring pipe is arranged in a flow field close to the outside of the sampling pipe 1, and the other end of the first pressure measuring pipe is connected with a pressure gauge 9; the second piezometric tube is used for measuring the static pressure in the sampling tube 1, one end of the second piezometric tube is arranged in the sampling tube 1, and the other end of the second piezometric tube is also connected with the pressure gauge 9.
Specifically, the ultrasonic coal dust collector 4 is divided into a gas-powder flow standing area and a coal dust collecting area from top to bottom, and a movable plate 13 capable of reciprocating along the gas-powder flow flowing direction is arranged between the two areas in a clinging manner; the housing 16 of the ultrasonic pulverized coal collector 4 remains sealed, leaving only the inlet and outlet for the flow of the pulverized coal. An ultrasonic sealing belt 10 is arranged on the inner wall of the top of the gas-powder flow standing area, a flow blocking plate 11 is arranged at the bottom of the gas-powder flow standing area, a plurality of flow blocking protrusions are arranged on the flow blocking plate 11, and an upper powder discharging hole 12 is formed between every two adjacent flow blocking protrusions; the plate surface of the flow choking protrusion is vertical to the flowing direction of the gas-powder flow, the upper powder discharge hole 12 is in a long and narrow strip shape, and the inlet and the outlet of the ultrasonic coal powder collector 4 are respectively arranged at the left and the right of the gas-powder flow standing area. The movable plate 13 can reciprocate along the flowing direction of the gas powder flow; the movable plate 13 is provided with a lower powder discharge hole 14; optionally, the number, shape and arrangement form of the lower powder discharge holes 14 and the upper powder discharge holes 12 are completely the same, and the coal dust collecting area is only provided with a coal dust collecting box 15 which can be taken out and put back.
According to the ultrasonic coal dust sampling system, the first pressure measuring pipe, the second pressure measuring pipe and the pressure gauge 9 are arranged, one end of the first pressure measuring pipe is positioned inside the sampling pipe 1, the first pressure measuring pipe and the second pressure measuring pipe are both connected with the pressure gauge 9, the pressure gauge 9 is used for measuring the static pressure of the gas-powder flow inside and outside the sampling pipe 1, the opening degree of the regulating valve 6 is adjusted accordingly, the flow velocity of the gas-powder flow inside and outside the sampling pipe 1 is balanced, constant-speed sampling is achieved, the flow velocity inside and outside the sampling pipe 1 is adapted to different flow velocities inside the powder conveying pipe, and coal dust sampling work of a direct-blowing type coal dust making system under variable working conditions can be better achieved. The flow-resisting bulges in the ultrasonic coal dust collector 4 and the ultrasonic sealing strip 10 form a plurality of mutually independent cavities, and the powder plays a role in slowing and stopping the airflow flowing through the ultrasonic coal dust collector 4. Meanwhile, ultrasonic waves emitted by the ultrasonic sealing strip 10 are combined, secondary flow different from the flow direction of the gas-powder flow can be generated in a sealing gap between the ultrasonic sealing strip 10 and the top of the flow blocking protrusion by means of a sound flow phenomenon, the kinetic energy of the gas-powder flow is further dissipated, the slowing effect on the gas-powder flow is enhanced, then the coal powder in the gas-powder flow is settled by means of the gravity action of the coal powder, and the sampling efficiency is better in a direct-blowing type powder preparation system under a small-flow working condition.
In one possible embodiment, a filter 5 is arranged between the ultrasonic coal dust collector 4 and the regulating valve 6. Residual coal dust in the air-powder flow flowing out of the ultrasonic coal dust collector 4 is collected through the filter 5, and damage to the regulating valve 6 and the air pump 7 caused by coal dust particles is prevented.
Referring to fig. 3, in a possible embodiment, the distance between the adjacent flow-resisting protrusions is 10 to 100mm, and the thickness of the flow-resisting protrusions is 1 to 5 mm. Specifically, the distance between the adjacent flow blocking protrusions is the flow blocking plate pitch a, the smaller the flow blocking plate pitch is, the better the coal dust collecting effect is, but the influence of the upper powder discharging holes 12 is received, and the influence of the air pressure size of the air suction pump 7 is achieved, the flow blocking plate pitch cannot be too small, the distance between the adjacent flow blocking protrusions is set to be 10-100 mm, and the better coal dust collecting effect is obtained. The thickness c of the flow-resisting protrusion is the average value of the thicknesses of the upper end and the lower end of the flow-resisting protrusion. The thickness of the flow resisting bulge is too thick, so that the space where the air powder flow slowly flows can be compressed, and the consumption of materials is increased; the thickness of the flow blocking protrusion is too thin, the difficulty of machining and manufacturing can be improved, the thickness of the flow blocking protrusion is set to be 1-5 mm, and balance between the flow blocking protrusion and the flow blocking protrusion is well achieved.
Referring to fig. 4, in a possible embodiment, the lengths of the upper and lower powder discharge holes 12 and 14 are not less than 90% of the length of the flow blocking protrusion, and are not more than the length of the flow blocking protrusion. Specifically, the lengths of the upper powder discharge hole 12 and the lower powder discharge hole 14, i.e., the dimension d of the upper powder discharge hole 12 and the lower powder discharge hole 14 perpendicular to the flowing direction of the air powder flow. The longer the upper powder discharge hole 12 and the lower powder discharge hole 14 are, the larger the powder discharge area is, the smoother the powder discharge is, but the lengths of the upper powder discharge hole 12 and the lower powder discharge hole 14 cannot be longer than that of the flow blocking protrusion; meanwhile, the upper powder discharge hole 12 and the lower powder discharge hole 14 cannot be too short, so that the powder discharge area is reduced, and the collection of pulverized coal is not facilitated. The length of the upper powder discharge hole 12 and the lower powder discharge hole 14 is set to be not less than 90% of the length of the flow blocking protrusion and not more than the length of the flow blocking protrusion, so that the powder discharge efficiency is ensured to the maximum extent.
In one possible embodiment, the total length of the gaps between both side surfaces of the flow-obstructing projection in the longitudinal direction and the inner wall surface of the housing 16 is not more than 0.5 mm. Specifically, the length of the flow-resisting protrusion, i.e., the dimension b of the flow-resisting protrusion perpendicular to and opposite to the flow direction of the gas-powder flow. The longer the length of the flow blocking bulge is, the better the flow blocking bulge is, the longer the flow blocking bulge is, the better the flow blocking bulge can be connected with the shell 16, and the shortest the flow blocking bulge can not enable the total length of a gap between the flow blocking plate 11 and the inner wall surface of the ultrasonic coal dust collector 4 to exceed 0.5mm, so that the coal dust collecting effect of the ultrasonic coal dust collector 4 is ensured.
In a possible embodiment, the distance between the adjacent upper powder discharge holes 12 is not less than 1.2 times the width of the upper powder discharge hole 12, and the distance between the adjacent lower powder discharge holes 14 is not less than 1.2 times the width of the lower powder discharge hole 14.
In one possible embodiment, at least 7 flow-blocking projections are provided.
In a possible embodiment, the gap between the ultrasonic sealing band 10 and the top of the spoiler 11 is not more than 5 mm.
In one possible embodiment, the spoiler projection tapers in a direction away from the spoiler 11.
Referring to fig. 5, in one possible embodiment, the ultrasonic sealing tape 10 includes a backing 17, an acousto-electric chip layer 18, a matching layer 19 and an acoustic lens 20; the acoustic lens 20 is connected on one side to the matching layer 19, the acoustic-electric chip layer 18, the backing 17 and the top inner wall of the housing 16 in that order.
Specifically, a backing 17 in the ultrasonic sealing tape 10 is closely attached to the inner wall of the top of the shell 16, an acoustic-electric chip layer 18 is closely attached to the outer side of the backing 17, a matching layer 19 is closely attached to the outer side of the acoustic-electric chip layer 18, an acoustic lens 20 is closely attached to the outer side of the matching layer 19, and the acoustic lens 20 is in direct contact with the air powder flow.
In a possible embodiment, the sound-electricity wafer layer 18 is composed of a plurality of sound-electricity wafers which are arranged in series, the sound-electricity wafers are rectangular or circular sound-electricity wafers, and the frequency range of ultrasonic waves generated by the sound-electricity wafers is 40-200 kHz; the acousto-electric chip layer 18 is composed of a plurality of acousto-electric chips which are arranged in series, the frequency range of ultrasonic waves generated by the acousto-electric chips is 40-200 kHz, the backing 17 is formed by hot pressing after mixing iron powder and epoxy resin, the matching layer 19 is made of epoxy resin filled with alumina in a single layer, and the acoustic lens 20 is made of polymethyl methacrylate.
In a possible implementation mode, the sampling pipe 1 adopts a flat head type phi 25mm elbow sampling pipe, an inlet is opposite to the incoming flow direction of the gas powder flow, when the sampling pipe is used, the sampling pipe is perpendicular to the pipe wall of the powder conveying pipe 2, the sampling pipe 1 is arranged in the powder conveying pipe 2 at a position, which is more than 10 times of the diameter of the powder conveying pipe 2 away from a local resistance component on the upstream side, and the straight pipe section of the powder conveying pipe 2 on the downstream side is not less than 3 times of the diameter of the powder conveying pipe 2. The sampling pipe 1 penetrates through an opening on the pipe wall of the powder conveying pipe 2 and is connected with the ultrasonic pulverized coal collector 4, the section of the pipeline 3 adopts a soft rubber hose, and the other pipelines 3 at all positions all adopt canvas rubber hoses. Static pressure holes are respectively arranged on the inner and outer pipe walls of the sampling pipe 1, and pressure measuring pipe channels are reserved in the sampling pipe; pressure gauge 9 adopts the differential pressure sensor a little, and first pressure-measuring pipe and second pressure-measuring pipe between sampling pipe 1 and pressure gauge 9 all adopt the tubular metal resonator, pipe diameter phi 6 mm. During sampling, the fluctuation of the static pressure difference inside and outside the sampling pipe 1 is ensured to be less than 50-100 Pa. The connection part of the sampling tube 1 and the opening of the powder conveying tube 2 is fixed by a tube seat and sealed by sealant.
10 flow-resisting bulges with the average thickness of 5mm are arranged in the ultrasonic pulverized coal collector 4, the distance between every two adjacent flow-resisting bulges is 20mm, and the two ends of each flow-resisting bulge are connected with the inner wall of the shell 16 without gaps. An upper row of powder holes 12 are respectively arranged between the adjacent flow resisting bulges, the length of the upper row of powder holes 12 is 90 percent of that of the flow resisting bulges, the width of the upper row of powder holes 12 is 7mm, a lower row of powder holes 14 are arranged on the movable plate 13 according to the arrangement form of the upper row of powder holes 12, and the number, the interval, the length and the width of the lower row of powder holes 14 are the same as those of the upper row of powder holes 12.
The back lining 17 in the ultrasonic sealing tape 10 is formed by hot-pressing after fully mixing iron powder and epoxy resin, wherein the diameter of the iron powder is 50 mu m, and the volume fraction is 20 percent; the acoustic-electric wafer 18 is made of rectangular PZT piezoelectric ceramic plates, the frequency is 120 +/-10 kHz, the matching layer 19 is made of low-viscosity epoxy resin filled with single-layer alumina, wherein the alumina powder has the particle size of 5 mu m and the volume fraction of 15 percent, and is extruded into a thin layer by casting, filling and extruding; the acoustic lens 20 is made of polymethyl methacrylate.
Based on the design, the ultrasonic coal powder sampling system has good adaptability in high-temperature, high-humidity and high-corrosivity environments.
The specific working process of the ultrasonic coal powder sampling system comprises the following steps:
firstly, through a first pressure measuring pipe and a second pressure measuring pipe, the static pressure of the gas powder flow inside and outside the sampling pipe 1 is measured by using the pressure gauge 9, and the opening degree of the regulating valve 6 is adjusted accordingly, so that the flow velocity of the gas powder flow inside and outside the sampling pipe 1 is balanced, and constant-speed sampling is realized. Under the action of the air pump 7, the coal powder flow sequentially flows through the sampling pipe 1, the ultrasonic coal powder collector 4, the filter 5, the regulating valve 6 and the air pump 7.
The gas-powder flow is sampled through the sampling pipe 1, and the gas-powder flow entering the ultrasonic coal powder collector 4 from the sampling pipe 1 completes the collection function of most of coal powder in the ultrasonic coal powder collector 4. The flow-resisting bulges in the ultrasonic coal dust collector 4 and the ultrasonic sealing strip 10 form a plurality of mutually independent cavities, and the powder plays a role in slowing and stopping the airflow flowing through the ultrasonic coal dust collector 4; the ultrasonic wave emitted by the ultrasonic sealing strip 10 can generate secondary flow different from the flow direction of the gas-powder flow in the sealing gap between the ultrasonic sealing strip 10 and the top of the flow blocking bulge by means of sound flow phenomenon, further dissipate the kinetic energy of the gas-powder flow, enhance the slowing effect on the gas-powder flow, and further enable the coal powder in the gas-powder flow to settle by means of the self gravity effect.
When the upper powder discharge hole 12 and the lower powder discharge hole 14 are completely staggered, the pulverized coal is gathered between the adjacent flow blocking protrusions. When the upper powder discharge hole 12 and the lower powder discharge hole 14 are completely aligned, the pulverized coal falls into the pulverized coal collecting box 15 due to gravity, so that the pulverized coal is collected.
The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (10)
1. An ultrasonic coal powder sampling system is characterized by comprising a sampling pipe (1), an ultrasonic coal powder collector (4), an adjusting valve (6), an air pump (7), a pressure measuring pipe assembly (8) and a pressure gauge (9); the ultrasonic coal dust collector (4) comprises an ultrasonic sealing belt (10), a spoiler (11), a movable plate (13), a coal dust collecting box (15) and a shell (16), and the pressure measuring pipe assembly (8) comprises a first pressure measuring pipe and a second pressure measuring pipe;
one end of the sampling pipe (1) is sequentially connected with an ultrasonic pulverized coal collector (4), a regulating valve (6) and an air pump (7); the shell (16) is sleeved above the flow blocking plate (11), the ultrasonic sealing tape (10) is connected with the inner wall of the top of the shell (16), a plurality of flow blocking protrusions are arranged on the flow blocking plate (11), and an upper powder discharging hole (12) is formed between every two adjacent flow blocking protrusions; the movable plate (13) is positioned between the spoiler (11) and the coal dust collecting box (15), and the movable plate (13) is provided with a plurality of lower powder discharging holes (14); one end of the first pressure measuring pipe is positioned inside the sampling pipe (1), and the first pressure measuring pipe and the second pressure measuring pipe are both connected with a pressure gauge (9); the ultrasonic sealing tape (10) is used for generating ultrasonic waves.
2. The ultrasonic pulverized coal sampling system according to claim 1, wherein a filter (5) is arranged between the ultrasonic pulverized coal collector (4) and the regulating valve (6).
3. The ultrasonic pulverized coal sampling system according to claim 1, wherein the distance between adjacent flow-resisting protrusions is 10-100 mm, and the thickness of each flow-resisting protrusion is 1-5 mm.
4. The ultrasonic pulverized coal sampling system according to claim 1, wherein the lengths of the upper pulverized coal discharge hole (12) and the lower pulverized coal discharge hole (14) are not less than 90% of the length of the flow blocking protrusion and not more than the length of the flow blocking protrusion.
5. The ultrasonic pulverized coal sampling system according to claim 1, wherein the total length of gaps between both side surfaces of the flow-obstructing protrusion in the length direction and the inner wall surface of the housing (16) is not more than 0.5 mm.
6. The ultrasonic pulverized coal sampling system according to claim 1, wherein the distance between the adjacent upper pulverized coal discharging holes (12) is not less than 1.2 times the width of the upper pulverized coal discharging holes (12), and the distance between the adjacent lower pulverized coal discharging holes (14) is not less than 1.2 times the width of the lower pulverized coal discharging holes (14).
7. The ultrasonic pulverized coal sampling system according to claim 1, wherein at least 7 flow-resisting protrusions are provided.
8. An ultrasonic coal dust sampling system according to claim 1, characterized in that the gap between the ultrasonic sealing strip (10) and the top of the spoiler (11) is not more than 5 mm.
9. An ultrasonic coal dust sampling system according to claim 1, wherein the ultrasonic sealing tape (10) comprises a backing (17), an acousto-electric chip layer (18), a matching layer (19) and an acoustic lens (20); one side of the acoustic lens (20) is connected with the matching layer (19), the acoustic-electric chip layer (18), the back lining (17) and the inner wall of the top of the shell (16) in sequence.
10. The ultrasonic pulverized coal sampling system according to claim 9, wherein the sonotrode layer (18) is composed of a plurality of sonotrodes arranged in series, the frequency range of ultrasonic waves generated by the sonotrodes is 40-200 kHz, the backing (17) is formed by hot pressing after mixing iron powder and epoxy resin, the matching layer (19) is made of epoxy resin filled with alumina in a single layer, and the acoustic lens (20) is made of polymethyl methacrylate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111397801.2A CN114002027A (en) | 2021-11-23 | 2021-11-23 | Ultrasonic pulverized coal sampling system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111397801.2A CN114002027A (en) | 2021-11-23 | 2021-11-23 | Ultrasonic pulverized coal sampling system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114002027A true CN114002027A (en) | 2022-02-01 |
Family
ID=79930066
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111397801.2A Pending CN114002027A (en) | 2021-11-23 | 2021-11-23 | Ultrasonic pulverized coal sampling system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114002027A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2963899A (en) * | 1955-03-11 | 1960-12-13 | Parsons C A & Co Ltd | Sonic gas analysers |
| KR20030057582A (en) * | 2001-12-28 | 2003-07-07 | 류정인 | Exhaust emission gas and soots capturing system in using ultrasonic wave |
| CN105486549A (en) * | 2016-01-20 | 2016-04-13 | 四川大学 | Sampling system capable of realizing constant-flow isokinetic sampling |
| CN207248564U (en) * | 2017-08-22 | 2018-04-17 | 上海发电设备成套设计研究院有限责任公司 | The device of isokinetic sample of pulverized coal is realized using ultrasonic wave |
| CN109863396A (en) * | 2016-10-05 | 2019-06-07 | 雅培实验室 | Device and method for sample analysis |
| CN216433664U (en) * | 2021-11-23 | 2022-05-03 | 西安热工研究院有限公司 | Ultrasonic pulverized coal sampling system |
-
2021
- 2021-11-23 CN CN202111397801.2A patent/CN114002027A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2963899A (en) * | 1955-03-11 | 1960-12-13 | Parsons C A & Co Ltd | Sonic gas analysers |
| KR20030057582A (en) * | 2001-12-28 | 2003-07-07 | 류정인 | Exhaust emission gas and soots capturing system in using ultrasonic wave |
| CN105486549A (en) * | 2016-01-20 | 2016-04-13 | 四川大学 | Sampling system capable of realizing constant-flow isokinetic sampling |
| CN109863396A (en) * | 2016-10-05 | 2019-06-07 | 雅培实验室 | Device and method for sample analysis |
| CN207248564U (en) * | 2017-08-22 | 2018-04-17 | 上海发电设备成套设计研究院有限责任公司 | The device of isokinetic sample of pulverized coal is realized using ultrasonic wave |
| CN216433664U (en) * | 2021-11-23 | 2022-05-03 | 西安热工研究院有限公司 | Ultrasonic pulverized coal sampling system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5039317A (en) | Radial inflow particle separation method and apparatus | |
| CN216433664U (en) | Ultrasonic pulverized coal sampling system | |
| EP1707096A3 (en) | Multi-cyclone dust collecting apparatus | |
| WO2008131420A3 (en) | Sample collector and processor | |
| US5549721A (en) | Cell for gas cleaning | |
| CN114002027A (en) | Ultrasonic pulverized coal sampling system | |
| CN115824726A (en) | Device and method for collecting total amount of dust discharged by agricultural production equipment | |
| CN102658527B (en) | Ground powder collecting device provided with cyclone filtering dust collector | |
| CN207823380U (en) | A kind of soft magnetic ferrite production raw material sieve grain device | |
| CN211963583U (en) | Pulse dust collector for bin top powder tank | |
| JP2004009047A (en) | Cleaner head of air cleaner apparatus | |
| JPS5738916A (en) | Filter medium for gas | |
| CN108246033A (en) | A kind of small dry dust-extraction unit | |
| CN201659116U (en) | Cyclone plate-type pipeline dust remover | |
| CN108057290A (en) | A kind of transverse-plug type filter cartridge dust remover | |
| CN109210202B (en) | Ultrasonic honeycomb sealing device and method | |
| CN201511298U (en) | Power ascending muffler of vibrating machine | |
| CN206153154U (en) | Clear unit that blows of two -chamber formula | |
| CN205825064U (en) | Sound is hammered into shape | |
| CN206493233U (en) | A kind of filter of card base sandblasting | |
| CN216605621U (en) | Compound high-efficient cyclone | |
| US2949167A (en) | Electrostatic precipitator | |
| CN210090048U (en) | Filter performance detection device | |
| CN103785241A (en) | Low-pressure injection pulse-jet bag dust collector | |
| CN217774465U (en) | Grain size adjustable powder concentrator |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |