CN103274217A - Novel coal conveying bunker type pump with blockage-preventing outlet - Google Patents
Novel coal conveying bunker type pump with blockage-preventing outlet Download PDFInfo
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- CN103274217A CN103274217A CN2013102483026A CN201310248302A CN103274217A CN 103274217 A CN103274217 A CN 103274217A CN 2013102483026 A CN2013102483026 A CN 2013102483026A CN 201310248302 A CN201310248302 A CN 201310248302A CN 103274217 A CN103274217 A CN 103274217A
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Abstract
A novel coal conveying bunker type pump with a blockage-preventing outlet comprises a bunker body, a pulverized coal bunker, a coaling pipeline, a pressurizing pipeline, an air incoming pipeline, a mixing chamber, a conveying pipeline, a purging pipeline, an air replenishing pipeline, a coaling fluidifying pipeline and an air exhausting pipeline. A flow choking screen plate is arranged between the bottom of the bunker body and the mixing chamber, the pressurizing pipeline comprises an upper pressurizing pipe and a lower pressurizing pipe, a pressure adjusting valve is arranged on the pressurizing pipeline, an outlet block valve is arranged at an initial end of the conveying pipeline, and a purging pipeline is connected after the block valve. The novel coal conveying bunker type pump with the blockage-preventing outlet can realize long-distance conveying of a great deal of pulverized coal, and is high in powder-air ratio and obvious in air saving effect, multilevel pressure protection and automatic constant-pressure adjusting are realized, the problem that pipeline blockage when coal is conveyed by a bunker type pump with a long outlet horizontal pipe is solved, material consumption and energy consumption are reduced, and normal production is guaranteed.
Description
Technical field
The present invention relates to the strength transportation art, belong to the novel defeated coal cone pump of a kind of outlet anti-clogging of the big flow of low pressure.
Background technology
At present, domestic blast furnace ordinary production all can also will be equipped with relevant devices such as coal grinder to carrying out coal powder injection in the stove.If the powder process ability is enough big, can also can utilize coal dust to act as a fuel or the equipment place of supplemental fuel fails coal to other, can save the relevant device capital fund like this.For coal dust smooth and easy conveying in flow ground greatly in pipeline, the past pulverized coal conveying at a distance of pulverized coal preparation system is substantially all selected the dense phase pump load transfer device for use now, i.e. Tong Cheng cone pump.During conveying, in sealed cabin body, by the power gas mixed coal powder it is sent to required field of employment.
In the normal process of pulverized coal conveying, after cone pump is carried a bit of horizontal feed pipeline of outlet, all need design one section vertical uplift pipeline, utilize solid gravity decline gas stream to rise, increase the boiling fluidisation mixed effect of conveying gas and coal dust (as shown in Figure 1,101 is vertical pipeline section boiling fluidisation interface point among the figure), it only exists in pipeline mixture effectively to prevent from taking place in the horizontal pipeline section coal dust after because of the rising pipeline section to gather obstruction, but utilizes this method to make dense phase pump lose its original intention of carrying as the concentrated phase strength.The powder controlled atmosphere throttling mixing that should carry out in comparatively roomy blending box is changed in the less relatively straight length in cross section and is carried out, and powder gas concentration will reduce, and same operational throughput will increase gas consumption.And if transfer line is even with the ascent stage sublevel, or pipeline tilts to install, or point of delivery and acceptance point sea level elevation are very nearly the same, gas and powder are adjusted under the rational situation in the cone pump blending box, feed status is except denseer mixture flows, mixed airflow can also the drive level or the powder of tilted tube bottom deposition do flowing forward of sand dune shape and carry, improved transport efficiency.But in present existing processes, unreasonable because of the cone pump structure, blending box does not have the gentle ratio adjusting of powder and fully mixes, transfer out the flat pipeline of mouthful horizontal saliva when longer, continue high dense coal dust and supply with and will make the bottom powder layer thickness in the horizontal pipe more and more higher, coal dust in horizontal pipe the filling long enough apart from the time, resistance increases, air-flow reduces, and finally will cause the plugging fault (as shown in Figure 2, among the figure 201 stop up point for horizontal pipeline section coal dust gathers) of pipe choking.
The to sum up analysis of two kinds of mounting processs can be reduced or remitted the plugging accident though outlet adds vertical pipeline section, and powder to air ratio can't promote, and gas consumption increases.Particularly coal dust is carried for safety and aqueous ingredients two aspects and is considered, generally with nitrogen as pumped (conveying) medium.Powder to air ratio can't rise to peak, then can't reach energy-saving effect.Though and the mode of movement of level and inclination pipeline can reach the dense conveying of Mi Xianggao in theory, there is defective in existing cone pump structure, the easy plugging of high dense conveying, and adopting time conveying of the little loadings multifrequency of every batch of material then to consume gas increases, valve shortening in service life.And after high dense conveying frequently plugging takes place, except influence is produced, get rid of plugging also to want labor intensive, need to consume source of the gas in addition, the waste coal dust.Plugging also can cause warehouse pressure to rise to the bleed pressure value of relatively high pressure in addition, and the sealing property of each valve is exerted an influence.
Summary of the invention
The technical problem to be solved in the present invention is: provide a kind of outlet anti-clogging novel defeated coal cone pump, set by pressure and can regulate down the coal amount automatically; The multistage pressure protection prevents plugging; According to operating mode, progressively improve powder to air ratio, reduce nitrogen consumption, energy savings; Increase airshed and reach coal amount down, promote traffic capacity, enhance productivity.
The technical solution adopted for the present invention to solve the technical problems is: the novel defeated coal cone pump of a kind of outlet anti-clogging, comprise warehouse, Pulverized Coal Bin, blending box, the pipeline of coalingging, the pressurising pipeline, admission line, transfer line, scavenging pipeline, the tonifying Qi pipeline, the fluidisation of coalingging pipeline and bleeder line, described warehouse top is communicated with at the bottom of the Pulverized Coal Bin by the pipeline of coalingging, Pulverized Coal Bin tapering and the fluidisation pipeline connection of coalingging, be connected bleeder line between warehouse and the Pulverized Coal Bin, warehouse one side and pressurising pipeline connection, the warehouse bottom is communicated with blending box, be provided with the choked flow web plate between described blending box and the warehouse, blending box and admission line, transfer line is communicated with, described transfer line initial end is provided with the outlet shutoff valve, connect scavenging pipeline on the transfer line behind the outlet shutoff valve, transfer line and tonifying Qi pipeline connection, described tonifying Qi pipeline and pressurising pipeline connection.
Described pressurising pipeline comprises the last pressurising pipe that is communicated with the warehouse top and the following fluidisation pipe that is communicated with the blending box of warehouse bottom, the described mouth of fluidisation pipe down is connected with short tube, described short tube extends to choked flow web plate top, and the pressurising pipeline is provided with pressure-modulation valve.
The characteristics that the present invention exports the novel defeated coal cone pump of anti-clogging below are described in detail in detail:
At first, because it is spacious empty that the structure of cone pump mostly is outlet greatly, in order to reach the gentle purpose that can mix of powder, a slice choked flow web plate is installed between the flange of warehouse bottom and bottom blending box, like this, after carrying air to open to open, it just is not coal dust in the storehouse of whole accumulation that air-flow is met right, but the part coal dust that from mesh, flows out.The delivery air amount is certain, by regulating down the coal amount, just can change powder to air ratio.
Described choked flow web plate is round plate, evenly has some mesh on the round plate, and the choked flow web plate is easy to process, and tooling cost is lower.
Then, the fluidisation hole on original blending box is drawn a short tube to more than the choked flow web plate, as the following fluidisation of warehouse pressurising pipeline.It can form a cyclone district on the choked flow web plate, pulverize low intensive tide knot coal dust piece, can prevent that tide knot coal dust from stopping up choked flow web plate hole, weakens coal regulating power down.The fluidisation pipe was communicated with pressurising pipe on the warehouse under this short tube passed through, and inserted and regulated source of the gas, sealed in a pressure-modulation valve again.Control the pressurising airshed by the aperture of system's automatic regulating valve, thus coal amount under the control.Powder to air ratio increases in delivery duct, and the storehouse is pressed and will be risen, and system can turn down the pressurising suction quantity automatically, and following coal amount reduces thereupon, and the coal amount reduces back chimneying resistance and reduces, and pressure descends, and valve is opened coal amount under the big increasing more automatically.So just reach the purpose of dynamically regulating powder to air ratio by setting pressure point, neither can cause plugging, do not wasted source of the gas again.
Secondly, some coal dust can see through the choked flow web plate and enter blending box in the process owing to coaling, also can bring the part bed material into when overbottom pressure discharged to delivery duct in the storehouse after the circulation stopping transportation was supplied gas automatically, carry air to open to open the starting stage in next time like this and still plugging may take place, therefore increase by one road scavenging pipeline in the transfer line initial end, when system's auto state always with a low discharge gas flow purging transfer line.It is except being transported away the bed material powder of transfer line initial segment, can also in system's auto-programming, suitably improve the force value of circulation terminal point, with clout amount in bed material discharge rate and the whole pipeline in the storehouse that increases, in the charging flow process, transfer to sweep gas and finish conveying, consequently reduced by every batch time of delivery, increased efficient.
At last, because delivery system adopts the negative pressure cloth bag to receive the mode of powder, in the process of coalingging, some coal dust is inhaled in the delivery duct of negative pressure, also can impact coal dust after the coning tower tray of the Pulverized Coal Bin of the conduit upper of coalingging melts and opens and enter delivery duct, coaling the time more progress to go into the coal dust of delivery duct more many, weighing exerts an influence to warehouse for this, also may cause plugging in addition, therefore increase an outlet shutoff valve in the delivery duct initial end, avoided the generation of above-mentioned situation.
In addition, (big as coal dust aqueous ingredients high viscosity under special circumstances, misoperation etc.), if also plugging can take place, can't carry out the block clearing operation as purging by above-mentioned low discharge, perhaps plugging back cabin body internal pressure does not descend continually and steadily, or opens behind the blow off valve release and purge still invalidly again, then can clear up obstruction by manual block clearing pipeline.
The present invention exports the novel defeated coal cone pump of anti-clogging and has following advantage:
(1) increased a slice choked flow web plate, thereby made the possibility of carrying gas and coal dust that the mixing adjusted is arranged, can reach best coal speed down, and prevent plugging;
(2) the fluidisation pipe draws short tube to choked flow web plate upper surface down, has increased fluidisation, prevents that choked flow web plate bore portion from stopping up;
(3) increased a pressure-modulation valve, pressure-modulation valve can be controlled flow of aerating air in the warehouse, and the coal amount is controlled down thereby reach, and the dynamic adjustments powder to air ratio also can be adjusted parameter according to field working conditions, and alerting ability is good;
(4) increase by one road scavenging pipeline at transfer line, can constantly carry out gas flow purging to transfer line, further prevent plugging;
(5) increase the outlet shutoff valve in the transfer line initial end, guaranteed continuous data, and also can prevent from carrying the plugging at initial stage to take place.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples.
Fig. 1 is the part-structure scheme drawing of prior art middle outlet pipeline section cone pump vertically upward;
Fig. 2 is the part-structure scheme drawing of the cone pump of prior art middle outlet pipeline section level;
Fig. 3 is that the present invention exports the novel defeated coal bunker formula pump structure scheme drawing of anti-clogging;
Among the figure: 1. warehouse, the pipeline of 2. coalingging, 3. charging valve, 4. Pulverized Coal Bin, 5. bleeder line, 6. blow off valve, the fluidisation of 7. coalingging pipeline, 8. coning tower tray valve, 9. pressure tester, 10. admission line, 11. reducing valve, 12. transfer valves, 13. blending boxs, 14. transfer line, 15. outlet shutoff valves, 16. scavenging pipelines, 17. blow down valve, 18. block clearing pipelines, 19. manual block clearing valves, 20. the tonifying Qi pipeline, 21. fluidisation gulp valves, 22. tonifying Qi reducing valves, 23. valve is propped up in tonifying Qi, 24. pressurising pipelines, 25. pressure-modulation valves, 26. following fluidisation pipe, pressurising pipe on 27., 28. choked flow web plates, 29. short tube, 101. vertical pipeline section boiling fluidisation interface point, 201. horizontal pipeline section coal dusts gather the obstruction point.
The specific embodiment
In conjunction with the accompanying drawings, the present invention is further detailed explanation.These accompanying drawings are the scheme drawing of simplification, basic structure of the present invention only is described in a schematic way, so it only show the formation relevant with the present invention.
As shown in Figure 3, the novel defeated coal cone pump of a kind of outlet anti-clogging comprises warehouse 1, the pipeline 2 of coalingging, bleeder line 5, the fluidisation of coalingging pipeline 7, pressure tester 9, admission line 10, blending box 13, transfer line 14, scavenging pipeline 16, manual compositions such as block clearing pipeline 18, tonifying Qi pipeline 20, pressurising pipeline 24, choked flow web plate 28.It is divided into charging, conveying, adjusting, manual intervention four bulks substantially.Describe in detail below in conjunction with diagram.
Among Fig. 3, feeding one comprises following facility substantially: the warehouse 1 of the coal dust of intending packing into; The coaling charging valve 3 of pipeline 2, it is composed in series by two clock valves, the sealing reliability in the time of can increasing strength and carry; The Pulverized Coal Bin 4 on charging valve 3 tops is sources, storehouse of pulverized coal conveying.When plan is coaling, open the blow off valve 6 of warehouse 1 upper exhaust line 5 earlier, bleeder line 5 is connected to Pulverized Coal Bin 4 tops, because Pulverized Coal Bin 4 has the powder of receipts bag dust collector, be negative pressure in the storehouse, blow off valve 6 is opened in the back cabin body 1 and also just is communicated with for negative pressure state, and is ready for coalingging.Again, charging valve 3 is opened respectively from the bottom to top, and Pulverized Coal Bin 4 beginnings are feeded in warehouse 1.Be to accelerate charging speed, can be according to the coning tower tray valve 8 on the default fluidisation pipeline 7 of coalingging of operating mode open time point and time length.Opening of coning tower tray valve 8, one can accelerate charging speed, and two can purge bleeder line 5 indirectly, and the coal dust flow velocity of sneaking into when making it be unlikely because of natural exhaust is deposition obstruction gradually slowly, loses exhaust effect, and influence is coaling.When the coal dust in the warehouse 1 is packed weight into when reaching certain value, control system is closed top charging valve 3 automatically earlier, closes bottom charging valve 3 again, closes blow off valve 6 at last, finishes the charging process automatically.This wherein, coning tower tray valve 8 because of default duration of valve opening less than charge time, be in closed condition.
Among Fig. 3, carry one and comprise following facility substantially: admission line 10 provides main supplying nitrogen, and pipeline comprises the reducing valve 11 of relying on oneself, transfer valve 12; Admission line connects blending box 13 left ends, and blending box 13 right-hand members connect transfer line 14, and blending box 13 upper ends connect warehouse 1, between itself and the warehouse 1 a slice choked flow web plate 28 is installed; On the transfer line 14, an outlet shutoff valve 15 is installed, has access to thinner scavenging pipeline 16 behind the outlet shutoff valve 15, scavenging pipeline 16 is provided with blow down valve 17; In addition tonifying Qi pipeline 20 and transfer line 14 are parallel, and segmentation inserts tonifying Qi on the transfer line 14, and to prop up valve 23 some, and it is fluidisation gulp valve 21 that a shutoff valve is arranged on the tonifying Qi pipeline 20, and a manual tonifying Qi reducing valve 22 is arranged thereafter.System finishes when changing feed status over to by coalingging in automatically, at first opens outlet shutoff valve 15, opens gulp valve 21 again, after open transfer valve 12, begin to fail the coal process.The judging point that defeated coal finishes is pressure tester 9, and warehouse 1 internal pressure rises after carrying beginning gradually, and resistance reaches maxim when all comprising powder gas mixture in transfer line 14 whole tube sections, and warehouse 1 pressure is in maxim thereupon.Carry rear, warehouse 1 interior coal dust amount is asymptotic to be zero, and powder to air ratio descends, and powder to air ratio also gradually down gradually, press and decrease by the storehouse in the pipeline.Press when being reduced to a default force value when the storehouse, namely give tacit consent to this batch of material and carry and finish, change the charging process of next batch of material automatically over to.
In defeated coal process, variotrol have or not and quality is related to input and the expenditure of production continuity and human and material resources.During cone pump before practicability of the present invention uses, or system carries powder to air ratio low, and energy consumption is big, or frequent plugging, lost labor and raw material.Characteristics of the present invention just are can the dynamic adjustments operating mode, when promoting powder to air ratio and reduce gas consumption, eliminates the plugging phenomenon fully, has avoided extra human input and nitrogen and coal dust loss.One of automatic adjusting of the present invention comprises following facility: pressurising pipeline 24, pneumatic pressure-regulating valve 25, go up pressurising pipe 27, fluidisation pipe 26, choked flow web plate 28 down, when other comprises one road auto state often open scavenging pipeline 16 and on blow down valve 17.Below describe in detail.
Among Fig. 3, pressurising pipeline 24 is connected in tonifying Qi pipeline 20, the one characteristic requirement because of the pressure-modulation valve 25 on the pressurising pipeline 24, pressure-modulation valve 25 general no hermetically sealed indexs, so all be to be installed on after the shutoff valve in the basic production technology, two because namely connecting blending box 13 after the existing cone pump master transfer valve 12, can't set up stable high pressure behind its valve, for fear of adding an independently pressurising shutoff valve again, so pressurising pipeline 24 is taken at after the gulp valve 21.After carrying beginning, the opening time point of pressure-modulation valve 25 monitoring transfer valves 12 adds a modifiable time-delay back control cock and drops into automatically, and valve is the complete shut-down state before.Why add time-delay, gather in the blending box 13 because there being coal dust to bleed in the process of coalingging, carry directly to add after the beginning and depress coal, plugging might take place.After pressure-modulation valve 25 dropped into automatically, it compared according to the force value in the warehouse 1 and preset value, by the PID computing, and the aperture of dynamic adjustments valve.The big pressure of the many resistances of powder rises and then closes minor valve, and the few resistance of powder lowers then opens big valve, and valve opening influences charge air in the warehouse 1, and charge air influences the following coal speed in the choked flow web plate 28.Carrying the intermediary, the action of pressure-modulation valve 25 remains near the preset value pressure in the warehouse 1, and powder to air ratio reaches maxim.Carrying after-stage, because coal dust amount in the storehouse reduces, even reaching standard-sized sheet, pressure-modulation valve 25 can not keep preset pressure value, and be in coal dust feed status in the pipeline this moment, and powder to air ratio descends to some extent.When pressure is lower than another preset value, assert that namely course of conveying finishes, finish to carry flow process.
Scavenging pipeline 16 is produced actual increasing for the present invention for reply, and effect obviously.In order to save nitrogen, when stopping using, coal handling system can guarantee to cut off all source of the gas outputs, add pneumatic cut-off valve 17 in the scavenging pipeline 16.It transfers in total system gets to normally open when automatic, always with a whole transfer line 14 of low discharge gas flow purging.This purging air-flow prevents the plugging except guaranteeing, the warehouse 1 interior bed material that discharges to pipeline in the stress-relief process in the warehouse 1 in the time of can also carrying stopping transportation to supply gas.Observe by operating mode and grope, the pressure preset value in the time of can also suitably improving stopping transportation and supply gas reduces the defeated coal time, and the time that reduces is interior should transfer to sweep gas by the part coal dust of conveying gas conveying finish transportation work in the time period of coalingging.Accelerated production efficiency in the time of energy-conservation again.It is the light plugging phenomenon of eliminating automatically under the special operation condition that scavenging pipeline also has the purposes of a maximum.Through knowhow being groped find that same powder to air ratio is more prone to take place coal dust blocking pipe phenomenon when carrying gas smaller when flow is big.Low discharge purges the elimination plugging and also is applied to aborning.When plugging takes place when, stop all air supply sources, pressure descends gradually in the storehouse and in the pipeline.After reducing to zero, if add a low discharge air-flow, the coal dust of obstruction can slowly be dredged and purge totally, if directly add the air-flow of a big flow again again, coal dust still can be forced to compress blocking pipe.Given this, existing cone pump except increasing control system, has also been done bigger change to system program.Added the multistage pressure protection, the first order is the self-regulatory energy of pressure-modulation valve 25, and press because special operation condition continues to rise in the storehouse, and pressure-modulation valve 25 is the output complete shut-down automatically; For the pipeline transfer valve 12 of delivery air amount maximum, close valve point as second stage pressure; Three-level protective is that fluidisation gulp valve 21 closes automatically; Level Four then is sweep gas, if sweep gas is stopped the setting value that back pressure drops to blow down valve 17, blow down valve 17 can be opened again automatically, and other valves are as the same.After sweep gas is stopped, because making pressure, possible leakage gas rises to again when purging the nearer Pyatyi alarm set point of definite value, system's outputting alarm, and switch to manually the prompting manual intervention automatically.Unless pursue too high powder to air ratio, generally the plugging alarm condition can not take place in Pyatyi pressure protect.
The manual intervention of system mainly refers to on-site manual block clearing operation, and it comprises following facility: manual block clearing pipeline 18, and on manual block clearing valve 19.After the plugging situation takes place, can't carry out the block clearing operation as purging by above-mentioned low discharge, perhaps plugging back cabin body 1 internal pressure does not descend continually and steadily, or opens blow off valve 6 back releases and purge still invalidly again, then can consider to start manual block clearing operation.During operation, operating personal only needs the manual block clearing valve 19 at scene is opened, open sweep gas again or carry gas, the coal mill coal spout that connects close together because of the pipeline behind the manual block clearing valve 19, manually during block clearing and open the grinding machine Powder discharging fan, negative pressure is bigger in this moment pipeline, and distance is nearer again, so manually the coal dust that stops up during block clearing is easier to be purged in the grinding machine.But it is invalid that manual unimpeded in use took place existing cone pump, needs transfer line segmentation flange disassembling bolts, unload the mode of operation that pipeline carries out block clearing, its science practicality of the present invention of having given counterevidence.
Compared with prior art, the present invention exports the novel defeated coal cone pump of anti-clogging and has following advantage:
(1) increased a slice choked flow web plate 28, thereby made the possibility of carrying gas and coal dust that the mixing adjusted is arranged, can reach best coal speed down, and prevent plugging;
(2) fluidisation pipe 26 draws short tube 29 to choked flow web plate 28 upper surfaces down, has increased fluidisation, prevents that choked flow web plate 28 bore portions from stopping up;
(3) increased a pressure-modulation valve 25, pressure-modulation valve 25 can be controlled flow of aerating air in the warehouse 1, and the coal amount is controlled down thereby reach, and the dynamic adjustments powder to air ratio also can be adjusted parameter according to field working conditions, and alerting ability is good;
(4) increase by one road scavenging pipeline 16 at transfer line 14, can constantly carry out gas flow purging to transfer line 14, further prevent plugging;
(5) increase outlet shutoff valve 15 in transfer line 14 initial end, guaranteed continuous data, and also can prevent from carrying the plugging at initial stage to take place.
The technical scope of this invention is not limited to the content on the specification sheets, must determine its technical scope according to the claim scope.
Claims (3)
1. one kind exports the novel defeated coal cone pump of anti-clogging, it is characterized in that: comprise warehouse, Pulverized Coal Bin, blending box, the pipeline of coalingging, the pressurising pipeline, admission line, transfer line, scavenging pipeline, the tonifying Qi pipeline, the fluidisation of coalingging pipeline and bleeder line, described warehouse top is communicated with at the bottom of the Pulverized Coal Bin by the pipeline of coalingging, Pulverized Coal Bin tapering and the fluidisation pipeline connection of coalingging, be connected bleeder line between warehouse and the Pulverized Coal Bin, warehouse one side and pressurising pipeline connection, the warehouse bottom is communicated with blending box, be provided with the choked flow web plate between described blending box and the warehouse, blending box and admission line, transfer line is communicated with, described transfer line initial end is provided with the outlet shutoff valve, connect scavenging pipeline on the transfer line behind the outlet shutoff valve, described transfer line and tonifying Qi pipeline connection, described tonifying Qi pipeline and pressurising pipeline connection.
2. the anti-blocking novel coal powder injection cone pump of outlet as claimed in claim 1, it is characterized in that: described pressurising pipeline comprises the last pressurising pipe that is communicated with the warehouse top and the following fluidisation pipe that is communicated with the blending box of warehouse bottom, the described mouth of fluidisation pipe down is connected with short tube, described short tube extends to choked flow mesh plate top, and the pressurising pipeline is provided with pressure-modulation valve.
3. the anti-blocking novel coal powder injection cone pump of outlet as claimed in claim 1, it is characterized in that: described choked flow web plate is round plate, evenly has some mesh on the round plate.
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| CN108016883A (en) * | 2016-11-02 | 2018-05-11 | 建浩Enc股份有限公司 | Powder conveying device |
| CN110775454A (en) * | 2019-12-02 | 2020-02-11 | 四川石油天然气建设工程有限责任公司 | A vertical barite powder working device |
| CN114476690A (en) * | 2021-12-09 | 2022-05-13 | 大连海大自动化控制工程有限公司 | Automatic clear stifled device of defeated grey system of thermal power plant |
| CN115140558A (en) * | 2022-08-25 | 2022-10-04 | 湖南核三力技术工程有限公司 | Low-fragmentation air force conveying method and device based on wind flow layer exchange in pipeline |
| CN115140558B (en) * | 2022-08-25 | 2024-05-03 | 湖南核三力技术工程有限公司 | Low-breakage pneumatic conveying method and device based on wind power flow layer exchange in pipeline |
| CN117361144A (en) * | 2023-12-08 | 2024-01-09 | 潍坊奥龙锌业有限公司 | Zinc oxide pneumatic pipeline conveying device |
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