CN105156894A - Super-high power ultrasonic crude oil cooling transportation and viscosity reduction device - Google Patents
Super-high power ultrasonic crude oil cooling transportation and viscosity reduction device Download PDFInfo
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- CN105156894A CN105156894A CN201510501247.6A CN201510501247A CN105156894A CN 105156894 A CN105156894 A CN 105156894A CN 201510501247 A CN201510501247 A CN 201510501247A CN 105156894 A CN105156894 A CN 105156894A
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Abstract
The invention relates to a super-high power ultrasonic crude oil cooling transportation and viscosity reduction device. The cooling transportation and viscosity reduction device is composed of a master control system and a viscosity reduction system. The master control system is connected with the viscosity reduction system through a multi-core transmission composite cable. The master control system is composed of an ultrasonic power source, a control host, a monitoring system and a displayer. The viscosity reduction system is composed of two or more composite transducers. The composite transducers are placed in a pressure container in an embedded or inserted type installing manner. The composite transducers are connected with the ultrasonic power source in series or in parallel through the multi-core transmission composite cable. The cooling transportation and viscosity reduction device and an intelligent power control system can overcome the defects that in the existing pipeline conveying process of crude oil, energy losses are high, the technology is complex, and the environment is polluted.
Description
Technical field
The present invention relates to Crude Oil Transportation technical field, particularly relate to the cold defeated viscosity reduction equipment of a kind of ultrahigh-power ultrasonic crude oil.
Background technique
Current domestic crude oil generally adopts the delivery technology of heating, chemical viscosity reduction method in pipeline transport process.Heating needs to consume the technical order that substantial oil and rock gas just can reach Crude Oil Transportation in Crude Oil Transportation process, contaminated air again except energy consumption height except, once after conveying stops for a certain reason, recovery transport difficult is very big again.Chemical method needs based on crude characteristic to select different types of pour-point depressant, therefore complex process, and is subject to processing the factor impacts such as temperature, rate of cooling and pour-point depressant dose concentration, therefore execute-in-place is difficult, simultaneously to environment.
Utilize ultrasonic wave transducer method machinery viscosity reduction to be emerging a special kind of skill, but the shortcoming of existing employing ultrasonic wave transducer technology viscosity reducing process is:
1, the power due to transducing oscillator is too little, so numerous oscillators can only be adopted to work to reach reducing crude oil viscosity object simultaneously.But under the flow velocity of crude oil 2m/s in the duct, ultrasonic power and flow velocity coupling cannot be reached, realize dynamic viscosity reduction in carried of crude oil.
2, many oscillator structures are parallel operations on circuit, and have an oscillator to produce electrical breakdown, then integrated circuit short circuit, whole equipment cannot work, more there is maintenance difficult especially, spot replace oscillator, hardly may, entirety is pulled down and is sent factory to keep in repair, and wastes time and energy, and cost is too large.
3, numerous little resonator transducer is adopted, multiple stage ultrasound wave emitter need be adopted for realizing most Cui coupling, to making outfit of equipment long-pending large, oscillator is because be arranged on pipeline outer wall, the reason that each oscillator resonant frequency controls respectively due to the difference on processing, assembly technology and multiple stage transmitter, when ultrasonication, sound vibration coupling can be produced, admittedly have wider working band, once tank body natural frequency drops in the wide working band of many oscillators, will local resonance be produced, cause stress to concentrate, the working life of tank body will be affected.
4, transducer is pasted onto on tank skin, its acoustic energy is delivered in crude oil liquid medium, be subject to the reflection of metal tank skin medium, refractive effect, greatly increase the loss that acoustic energy transmits, it is by the impact of metal can wall material, thickness and frequency of okperation, to making acoustic energy transmissions efficiency reduce, correspondingly add observable index.
5, its sound output capacity of many oscillators external mounting type transducer is little, and acoustic density is large not, and the speed of viscosity reduction is slow, is difficult to optimizing power and regulates, reach the coupling of action time and flow velocity.
6, because oscillator invests pipeline outer wall, easy excitated body vibration is so can produce larger noise.
Therefore, a kind of solution that can solve the problem is needed to prior art.
Summary of the invention
The object of the invention is to propose the cold defeated viscosity reduction equipment of a kind of ultrahigh-power ultrasonic crude oil, in order to solve the problem of existing oil transport pipeline cold bonding.
Object of the present invention is mainly achieved through the following technical solutions:
The cold defeated viscosity reduction equipment of ultrahigh-power ultrasonic crude oil, comprising:
Master control system 1 and viscosity reduction system 2;
Described master control system 1 is connected with viscosity reduction system 2 by multicore transmission composite cable, and described master control system 1 is made up of Ultrasonic Power Source 1-1, main control system and supervisory system 1-2, display device 1-3; Ultrasonic Power Source 1-1 one end ABAP Adapter, the other end is connected with main control system and supervisory system 1-2 by cable, and main control system and supervisory system 1-2 are connected with display device 1-3 by cable;
Described viscosity reduction system 2 is made up of pressurized container and two or more transducers; Described transducer is formed primarily of crossover sub 2-1, data acquisition unit 2-2, inner connection plug-in unit section 2-3, element radiates section 2-4, cone seal section 2-5, and transducer top is connected with Ultrasonic Power Source 1-1 by multicore transmission composite cable serial or parallel connection;
Described master control system also comprises distributed signal collecting unit, and described distributed signal collecting unit is transferred to process control machine unit and power generation unit by CAN after being gathered by the parameter informations such as each road transducer real-time working voltage, electric current, temperature; The control system of these unit using controlled transducer parameters (speed of the parameter such as voltage, electric current, phase place, power, resonance point, temperature and change thereof) as feedback, after calculating actual output and given deviation, carry out the power stage correction of power cell, make each transducer can reach best resonance point and power rating, thus ensure the uniform viscosity reduction of crude oil energy, smooth transport.
Preferably, described pressurized container inside has dividing plate, and described dividing plate makes the inner crude oil flow of pressurized container form snakelike flowing; Form individual cavities between adjacent separator, in each cavity, all transducer is set.
Preferably, described transducer is composite cylindrical transducer; Described transducer connects and composes successively primarily of crossover sub 2-1, data acquisition unit 2-2, inner connection plug-in unit section 2-3, element radiates section 2-4, cone seal section 2-5, and transducer top is connected with Ultrasonic Power Source 1-1 by multicore transmission composite cable serial or parallel connection.
Preferably, described transducer adopts plug-in type or built-in mounting type.
Preferably, described transducer is insert cartridge; The axis of described transducer and the axis normal of described pressurized container cavity, described transducer is provided with flange, described transducer is connected to the side of described pressurized container cavity through described flange seal, and the end of described transducer is stretched into inside described pressurized container cavity along described pressurized container cavity radial direction.
Preferably, described transducer is built-in transducer; Described transducer is fixed on described pressurized container cavity inner wall by transducer mount, and described transducer is symmetrical arranged.
Preferably, described transducer is superhigh power efficient cylinder rod type transducer; Described superhigh power efficient cylinder rod type transducer adopts the quantity of circle-ring vibrator to change the size of power capacity.
Preferably, described circle-ring vibrator is four direction oscillators or two direction oscillators.
Preferably, described circle-ring vibrator quantity is 16; The limit electric power that each circle-ring vibrator produces is 2-3kw, then its power of transducer of 16 circle-ring vibrator compositions is 32kw-48kw.
Preferably, described flange root is provided with damping trough.
Can be found out by technique scheme, the advantage that the present invention has may be summarized as follows, and other advantages specifically do not listed can be represented in follow-up embodiment and in accompanying drawing:
1, the structure of this composite transducer be remain that longitudinal vibration transducer is firm in structure, power capacity is large, conversion efficiency is high, the advantage of reliable, good stability, one dimension vibration is converted into the radial vibration mode of tubular type, and increase radiation surface, namely radiation resistance is increased, further increase electro-acoustic conversion efficiency, simultaneously the more convenient field settings for pipeline shape.
2, for further illustrating structural feature, 2-4 longitudinal little oscillator is adopted to cut into cylinder cambered surface with public back shroud with by front shroud radiation surface, cylndrical surface is pieced together by 2-4 cambered surface, be enclosed within outside combined elements in order to certain magnitude of interference internal diameter steel annulus and temperature difference mode again, this is just applied with enough radial prestressing force, improve piezoelectric constant mechanical strength, add power capacity, form compound circle-ring vibrator, it is by than the large 3-4 of the power capacity of equidimension piezoelectric constant annulus doubly, and electro-acoustic conversion efficiency increases again because of the piezoelectric modulus that make use of piezoelectric constant different.
3, the power capacity of above-mentioned steel bluk recombination circle-ring vibrator can reach more than 2 kilowatts, according to power capacity requirement, by laser beam welding by tens of annulus formation garden welded together post rod type transducers, so that a composite transducer power capacity reaches tens of kilowatt, this just for the installing and using of this transducer, keep in repair, change in time and bring convenience.
4, paste ultrasonic vibrator relative to outside pipe, acoustic energy transmissions loss 50% will be reduced by internally-inlaid or plug-in type method, and improve conversion efficiency, relatively reduce energy consumption.In addition have enough power capacities, crude oil, obtaining the energy of dynamic viscosity reduction in time, could keep the custom requirements of crude oil flow velocity 2m/s.
5, by cylindrical rod transducer ingenious layout of crawling in buffer container, so that crude oil flows through the irradiation having ultrasonic energy in each chamber, be equivalent to carry out repeatedly oil degradation, adopt intelligent power to control to carry out Modulating Power density in starting and the whole progress of work simultaneously, crude oil flow velocity is made to obtain the most reasonably regulating, controlling, optimize the coupling of transducer power and crude oil flow velocity, thus obtain the optimum efficiency of reducing crude oil viscosity.
6, by the inner multiple control program technic of transmitter, original multiple stage transmitter is controlled to change into be controlled by a transmitter, simplifies viscosity-falling unit, reduce cost.Realize the conformity of multiple transducer synchronous vibration frequency.
Accompanying drawing explanation
Fig. 1 is the cold defeated viscosity reduction equipment schematic diagram of ultrahigh-power ultrasonic crude oil of the present invention;
Fig. 2 is circle-ring vibrator schematic diagram of the present invention;
Fig. 3 is transducer schematic diagram of the present invention;
Fig. 4 is transducer plug-in type of the present invention and built-in schematic diagram;
Fig. 5 is the cold defeated viscosity reduction equipment Control System schematic diagram of ultrahigh-power ultrasonic crude oil of the present invention.
Embodiment
For making object of the present invention, technological scheme and advantage clearly understand, enumerate preferred embodiment referring to accompanying drawing, the present invention is described in more detail.But it should be noted that, the many details listed in specification are only used to make reader to have a thorough understanding, even if do not have these specific details also can realize these aspects of the present invention to one or more aspect of the present invention.
What the present invention adopted is ultrasonic wave transducer principle, utilize the high density sound intensity that number multikilowatt power ultrasonic wave transducer produces, break through the acoustic cavitation that surface tension produces liquid in a fluid, the continuous accumulation energy of small bubble produced also constantly expands, when the bubbles burst, transient burst of energy among a small circle, produces High Temperature High Pressure, and produce high-speed micro-jet, produce strong mechanical vibration between micel.
The effect that the strong mechanical vibration of liquid cause is: one, at the separating surface place of fluid with pressurized container, due to crude oil particle vibration speed generation greatest differences, cause boundary friction, produce heat and cause local heating, even localized hyperthermia, thus reduce viscosity of crude; Two, crude oil, under long-time ul-trasonic irradiation, has larger acceleration because crude oil is intermolecular, forms intermolecular relative movement, and the effect of its inertial force makes molecular chain rupture, and large molecule is pulverized, thus reduces former oil viscosity; Three, crude oil can produce strong vibration under hyperacoustic effect, and under cavitation, the fracture of crude oil Middle molecule chain, reduces viscosity of crude; Four, localized hyperthermia's high pressure that cavitation produces, accelerating oxidation reduction reaction, the depolymerization of polymer substance, make cementing asphaltene molecules bond fission, in addition, the High Temperature High Pressure that cavitation produces can produce series of secondary reaction, as chemical effect, sonoluminescence, peptizaiton and emulsification etc. also can reduce former oil viscosity.
Based on ultrasonic wave transducer principle, the present invention is improved in cold defeated equipment transducing structure and control technique, just can play cold defeated viscosity reduction object.Superhigh power of the present invention efficient cylinder rod type transducer, has the structural type that double excitation, four excitations are different with multiple activation etc., and above-mentioned incentive structure produces two kinds of mode of vibration with difference excitation (homophase and anti-phase), and its harmonics is also variant.
Adopt built-in type or plug-type mounting type and intelligent power control system as shown in Figure 4, solve crude oil in the methodical deficiency in pipe conveying procedure Central Plains, be i.e. a series of disadvantage such as energy loss high, complex process, befouling environment.
Lower mask body introduces the structure of the cold defeated viscosity reduction equipment of the present invention, and therefrom embodies superiority of the present invention.
This equipment comprises master control system 1 and viscosity reduction system 2 two-part, and master control system 1 is connected with viscosity reduction system 2 by multicore transmission composite cable, and as shown in Figure 1, master control system 1 is made up of Ultrasonic Power Source 1-1, main control system and supervisory system 1-2, display device 1-3.Ultrasonic Power Source 1-1 one end ABAP Adapter, the other end is connected with main control system and supervisory system 1-2 by cable, and main control system and supervisory system 1-2 are connected with display device 1-3 by cable.
Viscosity reduction system 2 is made up of pressurized container and two or more transducers, and Ultrasonic Power Source 1-1 is because be connected with multiple transducer, so use multicore transmission composite cable.Transducer is formed primarily of crossover sub 2-1, data acquisition unit 2-2, inner connection plug-in unit section 2-3, element radiates section 2-4, cone seal section 2-5, and transducer top is connected with Ultrasonic Power Source 1-1 by multicore transmission composite cable serial or parallel connection.
The symplex structure form of composite transducer makes Surge chamber even, the interference fit of outer steel loop makes Surge chamber increase, relative piezoelectricity garden ring, be high tension electricity coefficient d33, and its mode of piezoelectric ceramic ring determines the piezoelectric coefficient d 31 worked, both differ from more than one times, and inside is not oil-filled in addition, eliminate interior radiation, make composite transducer have the characteristic of high efficiency, high power capacity.The overall structure form of transducer is simultaneously: crossover sub 2-1 is connected with data acquisition unit 2-2 by latch, data acquisition unit 2-2 is connected plug-in unit section 2-3 by connected set with inside and is connected, inner connection plug-in unit section 2-3, element radiates section 2-4, cone seal section 2-5 adopt straight mouth structure to locate at steel annulus overcoat successively, and seam crossing adopts laser bonding to be connected.Wherein data acquisition unit 2-2 is connected with element radiates section 2-4 makes this transducer become the controlled intelligent transducer of a kind of performance by the inner plug-in unit 2-3 that connects.
Compound garden post transducer changes the size of power capacity with 16 radial garden ring oscillator composition transducers neatly by adopting the quantity of the garden band of column, the limit electric power that each radial garden ring oscillator produces is 2-3kw, then 16 radial garden rings its power of molecular transducer that shakes is 32kw-48kw.Under high loading conditions, the general large what 50% of its electroacoustic conversion ratio, then the sound output of each transducer is 16kw-24kw.This has exceeded the power capacity of any one high power altrasonic transducer in the past
Preferably, carry out Redundancy Design, only adopt 1/3 of power limit in normal operation, namely the electric power of each radial garden ring oscillator is 1kw.The present invention adopts that research and development are voluntarily efficient, high power radial radiation cylindrical transducer, and this transducer is easy for installation, and maintenance, repair are simple, have employed Redundancy Design, and this design concept then substantially increases the stability of work, reliability, Security.
Transducer mounting type adopts plug-in type (as Fig. 4) or putting type (as Fig. 4) to be applied directly to by acoustic energy to be needed in the crude oil of viscosity reduction, decreases the reflection of acoustic energy in multilayer dielectricity, refraction loss, improves equipment work efficiency, reduces energy consumption.Two kinds of mounting types are chosen depending on on-the-spot condition.Because transducer power capacity is large and the snakelike flowing of crude oil in pressurized container, in each chamber, radial radiation cylindrical transducer is all set, carry out repeatedly oil degradation, adopt intelligent power to control to carry out Modulating Power density in starting and the whole progress of work simultaneously, crude oil flow velocity is made to obtain the most reasonably regulating, controlling, optimize transducer power and crude oil flow velocity matches, thus reach the most Cui effect of reducing crude oil viscosity.
Control system is made up of process control machine 6-1, power generation unit 6-2 and distributed signal collecting unit 6-3.Start with in each working hour in whole system, process control machine 6-1 passes through software program setting power change programme according to flow rates demand, produce power stage control data stream, by power generation unit 6-2 output power waveform, be loaded on transducer through composite cable by power, transducer carries out high-power ultrasonics transformation of energy to realize viscosity reduction.Simultaneously by the working condition of the real-time monitor transducer of distributed signal collecting unit 6-3, and can the power parameter of regulation output in real time, make the working procedure of cold defeated viscosity reduction obtain reasonably optimizing.Redundant power design adopts the mode of N+1 backup in addition, can even carry out rapidly changing, substituting when any one part of intelligent power system has fault in non-stop-machine situation.Thus ensure the reliability of integral device work, stability, Security.
Add redundant power design, in starting and each working hour, according to flow rates demand by software program setting power change programme, and have supervisory system, real-time adjustment, makes the progress of work be optimized, and ensure that the reliability of integral device work, stability, Security.Realize controlling as many as 12 ~ No. 24 transducer in real time respectively by a special chip, monitor the Parameters variation such as the electric current of each road transducer, voltage, power, efficiency, power factor, temperature, load, resonance point simultaneously, the parameters such as the output frequency of real-time adjustment every road transducer and output power, realize the working effect adjusting each transducer with the difference of environment and position, make crude Treatment in whole oil tank even, reach designing requirement.
By multiple control program and the technology of the inner intelligent chip of power generation unit 6-2, we achieve and control multichannel transducer unit (can reach 1 ~ 24 tunnel) in real time respectively by a special chip.Original multiple stage transmitter control multiple stage small-power transducer scheme is changed into and is controlled by a transmitter, multinomial output, thus the synchronous working realizing multiple transducer.Controlled to change into be controlled by a transmitter by original multiple stage transmitter, multinomial output, realizes multiple transducer synchronous resonant.
By process control machine 6-1, power generation unit 6-2 and and distributed signal collecting unit 6-3 original power open loop control program is upgraded to close-loop control scheme, to change after the power stage of original viscosity reduction transmission system state no matter.Distributed signal collecting unit is transferred to process control machine unit and power generation unit by CAN after being gathered by the parameter information such as transducer real-time working voltage, electric current, temperature on each road.The control system of these unit using controlled transducer parameters (speed of the parameter such as voltage, electric current, phase place, power, resonance point, temperature and change thereof) as feedback, after calculating actual output and given deviation, the power stage correction of power cell is carried out by core algorithm, make each transducer can reach best resonance point and power rating, thus ensure the uniform viscosity reduction of crude oil energy in whole oil tank, smooth transport.Monitor the Parameters variation such as the electric current of each road transducer, voltage, power, efficiency, power factor, temperature, load, resonance point by transmitter receiving system and transducer data collector simultaneously, original opened loop control is changed into closed loop control control system according to control object (speed of the parameter such as electric current, voltage, phase place, power, temperature, flow and change thereof) output feedack, Corrective control is carried out by core algorithm, when measuring reality, with plan, deviation occurring, correct by standard.Controlled transducer is made to reach optimum resonance point and expecting state.Define transducer working state real-time monitoring.
In sum, the invention solves crude oil heating loss crude oil, chemical process complexity and environmental pollution problem in pipe conveying procedure.By plug-in type or interior method for posting, transducer is directly contacted with crude oil, reduce acoustic energy transmissions loss, improve transmitting sound power, shorten pyrolysis time.Be equipped with efficient, high-power ultrasonic rod, bring convenience, due to radial oscillator arrangement mode to installation, maintenance, repair, power capacity is large, use under reduction power, greatly improve working stability, reliability, namely add the working life of equipment key part.Control several transducer technology parameters in real time by intelligent monitor system, and can independently control, make the work efficiency of equipment obtain largest optimization.
Although with reference to illustrative embodiments, invention has been described, but be to be understood that, the present invention is not limited in literary composition the embodiment described in detail and illustrate, when not departing from claims limited range, those skilled in the art can make various change to described illustrative embodiments.
Claims (10)
1. the cold defeated viscosity reduction equipment of ultrahigh-power ultrasonic crude oil, is characterized in that, comprising:
Master control system 1 and viscosity reduction system 2;
Described master control system 1 is connected with viscosity reduction system 2 by multicore transmission composite cable, and described master control system 1 is made up of Ultrasonic Power Source 1-1, main control system and supervisory system 1-2, display device 1-3; Ultrasonic Power Source 1-1 one end ABAP Adapter, the other end is connected with main control system and supervisory system 1-2 by cable, and main control system and supervisory system 1-2 are connected with display device 1-3 by cable;
Described viscosity reduction system 2 is made up of pressurized container and two or more transducers; Described transducer is formed primarily of crossover sub 2-1, data acquisition unit 2-2, inner connection plug-in unit section 2-3, element radiates section 2-4, cone seal section 2-5, and transducer top is connected with Ultrasonic Power Source 1-1 by multicore transmission composite cable serial or parallel connection;
Described master control system also comprises distributed signal collecting unit, and described distributed signal collecting unit is transferred to process control machine unit and power generation unit by CAN after being gathered by the parameter informations such as each road transducer real-time working voltage, electric current, temperature; The control system of these unit using controlled transducer parameters (speed of the parameter such as voltage, electric current, phase place, power, resonance point, temperature and change thereof) as feedback, after calculating actual output and given deviation, carry out the power stage correction of power cell, make each transducer can reach best resonance point and power rating, thus ensure the uniform viscosity reduction of crude oil energy, smooth transport.
2. the cold defeated viscosity reduction equipment of ultrahigh-power ultrasonic crude oil as claimed in claim 1, is characterized in that: described pressurized container inside has dividing plate, and described dividing plate makes the inner crude oil flow of pressurized container form snakelike flowing; Form individual cavities between adjacent separator, in each cavity, all transducer is set.
3. the cold defeated viscosity reduction equipment of ultrahigh-power ultrasonic crude oil as claimed in claim 1, is characterized in that: described transducer is composite cylindrical transducer; Described transducer connects and composes successively primarily of crossover sub 2-1, data acquisition unit 2-2, inner connection plug-in unit section 2-3, element radiates section 2-4, cone seal section 2-5, and transducer top is connected with Ultrasonic Power Source 1-1 by multicore transmission composite cable serial or parallel connection.
4. the cold defeated viscosity reduction equipment of ultrahigh-power ultrasonic crude oil as claimed in claim 1, is characterized in that: described transducer adopts plug-in type or built-in mounting type.
5. the cold defeated viscosity reduction equipment of ultrahigh-power ultrasonic crude oil as claimed in claim 1, is characterized in that: described transducer is insert cartridge; The axis of described transducer and the axis normal of described pressurized container cavity, described transducer is provided with flange, described transducer is connected to the side of described pressurized container cavity through described flange seal, and the end of described transducer is stretched into inside described pressurized container cavity along described pressurized container cavity radial direction.
6. the cold defeated viscosity reduction equipment of ultrahigh-power ultrasonic crude oil as claimed in claim 1, is characterized in that: described transducer is built-in transducer; Described transducer is fixed on described pressurized container cavity inner wall by transducer mount, and described transducer is symmetrical arranged.
7. the cold defeated viscosity reduction equipment of ultrahigh-power ultrasonic crude oil as claimed in claim 1, is characterized in that: described transducer is superhigh power efficient cylinder rod type transducer; Described superhigh power efficient cylinder rod type transducer adopts the quantity of circle-ring vibrator to change the size of power capacity.
8. the cold defeated viscosity reduction equipment of ultrahigh-power ultrasonic crude oil as claimed in claim 1, is characterized in that: described circle-ring vibrator is four direction oscillators or two direction oscillators.
9. the cold defeated viscosity reduction equipment of ultrahigh-power ultrasonic crude oil as claimed in claim 1, is characterized in that: described circle-ring vibrator quantity is 16; The limit electric power that each circle-ring vibrator produces is 2-3kw, then its power of transducer of 16 circle-ring vibrator compositions is 32kw-48kw.
10. the cold defeated viscosity reduction equipment of ultrahigh-power ultrasonic crude oil as claimed in claim 1, is characterized in that: described flange root is provided with damping trough.
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Cited By (4)
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| CN108998073A (en) * | 2018-08-13 | 2018-12-14 | 黑龙江兰德超声科技股份有限公司 | Power ultrasound reducing crude oil viscosity transfer process tank |
| CN109942051A (en) * | 2019-04-09 | 2019-06-28 | 苏州哈工拓普传感控制技术有限公司 | A kind of polymer-containing wastewater viscosity reduction system based on high-power ultrasonics |
| CN111570242A (en) * | 2019-02-19 | 2020-08-25 | 中国石油化工股份有限公司 | Ultrasonic transducer and ultrasonic transduction device for viscosity reduction of thick oil |
| CN112543065A (en) * | 2020-12-03 | 2021-03-23 | 中北大学 | Wireless power transmission and communication device and communication method for sealed metal container |
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Application publication date: 20151216 |
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