阅读说明：本技术 一种具有背压结构的声波助燃装置及其安装方式 (Sound wave combustion-supporting device with back pressure structure and installation method thereof ) 是由 薛晓亮 郭金柱 岳婷 崔冠一 于 2021-09-01 设计创作，主要内容包括：本发明公开一种具有背压结构的声波助燃装置及其安装方式,包括用于声波助燃装置的背压结构,其包括与进气管连通的背压腔,背压腔位于叶轮的出气侧,叶轮顶部穿过进气管暴露在背压腔中。通过在声波助燃装置中设计背压结构,采用将与进气管连通的背压腔设置在叶轮的出气侧,叶轮顶部穿过进气管暴露在背压腔中的结构设计,使其利用进气管中相同的空气压力施加在叶轮的出气侧上,由此使叶轮的进气侧和出气侧的压力得以平衡,进而提高叶轮的工作寿命,从而保证声波发生器的正常工作。(The invention discloses a sound wave combustion-supporting device with a backpressure structure and an installation mode thereof. Through designing the backpressure structure in the combustion-supporting device of sound wave, adopt the back pressure chamber setting that will communicate with the intake pipe in the play gas side of impeller, the impeller top passes the structural design that the intake pipe exposes in the back pressure chamber, makes it utilize the same air pressure in the intake pipe to exert on the play gas side of impeller, makes the pressure of the side of admitting air of impeller and the side of giving vent to anger balance from this, and then improves the working life of impeller to guarantee the normal work of acoustic wave generator.)

1. A backpressure structure for a sound wave combustion-supporting device is characterized in that: the impeller comprises a back pressure cavity communicated with an air inlet pipe, the back pressure cavity is positioned on the air outlet side of the impeller, and the top of the impeller penetrates through the air inlet pipe to be exposed in the back pressure cavity.

2. The back pressure structure according to claim 1, wherein: the back pressure cavity is communicated with the air inlet pipe through a bypass, and an inlet of the bypass is formed at a position close to an inlet of the air inlet pipe.

3. An acoustic wave combustion supporting device is characterized in that: the air inlet pipe mounting hole, the sound wave guide pipe mounting hole and the driving device mounting hole are respectively formed in different end faces of the shell; the air inlet of the air inlet pipe is arranged at the air inlet pipe mounting hole, and the air outlet of the air inlet pipe extends to the sound wave guide pipe mounting hole from the inside of the shell; the acoustic waveguide is arranged at the mounting hole of the acoustic waveguide and is communicated with the air outlet of the air inlet pipe; the driving device is arranged at the mounting hole of the driving device and is connected with the transmission device; the transmission device is connected with the driving device and an impeller arranged in the shell; the impeller can penetrate through the air inlet pipe along the cross section direction of the air inlet pipe, and can cut flowing air in the air inlet pipe when rotating; further comprising a back pressure structure as claimed in claim 1 or 2.

4. The acoustic wave combustion supporting device according to claim 3, wherein: the end face of the air inlet pipe mounting hole is vertical to the end face of the acoustic waveguide mounting hole; the air inlet pipe is a tapered arc-shaped pipe.

5. The acoustic wave combustion supporting device according to claim 4, wherein: the acoustic waveguide is a flared acoustic waveguide; is connected with the air inlet pipe through a flange.

6. The acoustic wave combustion supporting device according to claim 4, wherein: the end face where the driving device mounting hole is located is parallel to the end face where the acoustic waveguide mounting hole is located, and the driving device is a variable frequency motor.

7. The acoustic wave combustion supporting device according to claim 6, wherein: the transmission device is a transmission shaft, and the transmission shaft is superposed with the central shafts of the variable frequency motor and the impeller; one end of the transmission shaft is connected with a driving shaft of the variable frequency motor, and the other end of the transmission shaft is connected with a rotating shaft of the impeller.

8. The utility model provides a combustion-supporting device's mounting means of sound wave which characterized in that: the four furnace walls of the boiler furnace are respectively provided with 9 sound wave combustion-supporting devices, the sound wave combustion-supporting devices are arranged in a 3 x 3 mode, and each row of the sound wave combustion-supporting devices and the burners on each layer of the boiler furnace are located on the same plane.

Technical Field

The invention relates to a gas-sound conversion device in the technical field of sound energy application, in particular to a sound wave combustion-supporting device with a back pressure structure and an installation mode thereof.

Background

During the production and operation of the boiler, the contact surfaces of the heating surfaces (a water-cooled wall, a superheater, an economizer, a heat exchanger, a flue and the like) of the boiler and coal combustion gas have the phenomena of dust deposition, slag bonding and coking, so that the heat transfer effect of the boiler is seriously weakened, the heat exchange efficiency is greatly reduced, the great waste of the coal combustion heat value is caused, meanwhile, the corrosion and the abrasion of the pipe wall of a heating body are aggravated, the probability of the pipe explosion accident of the boiler is increased, and the safety production is influenced. Coking in the boiler also poses great harm to the safe operation of the boiler.

The existing soot blowing devices installed on the utility boiler mainly comprise a steam soot blower, a sound wave soot blower and a shock wave soot blower.

Steam soot blower is traditional soot blower, because the characteristics of structure and medium, in addition high temperature environment's influence, the soot blowing barrel easily takes place phenomenons such as jam, malfunctioning, steam leakage, and equipment fault rate is higher relatively, requires to maintain the level higher, and long-time trouble is not handled and can be leaded to blowing to decrease the pipe wall shortcoming: (1) soot blowing consumes steam, reduces the dew point of flue gas, and increases boiler make-up water. (2) Soot blowing can only remove the blown heating surface and has dead angles. (3) The telescopic part of the long telescopic soot blower is easy to deform and jam, steam blows to damage a heating surface to cause tube explosion, and the long telescopic soot blower is large in maintenance amount, large in structural size and large in occupied space position.

The existing diaphragm acoustic wave soot blower has a small acoustic wave energy effect, and the soot blowing effect is not obvious, so that the existing accumulated dust can not be removed basically.

The shock wave soot blower is also a kind of ash removing technology, and utilizes the energy of instantaneous explosion to produce super shock wave to remove the ash accumulated in boiler. But the gas source is influenced by the dangers of acetylene, natural gas and other gas sources, and the gas source is worried about the selection. The disadvantages are as follows: (1) soot blowing consumes fuel gas, and the gas supply equipment needs to be replaced periodically. (2) Soot blowing mainly has a large effect on a vertical brushing surface and has dead corners. (3) Soot blowing is performed for a long time to wash a fixed heating surface, and gas needs to be paid attention to safety.

In view of the above, chinese patent (CN106196117A) discloses a dynamic and static ring type low-frequency high-power acoustic soot blower, which is structurally characterized in that an acoustic amplifier is connected with one end of an acoustic generator main body through an acoustic pipe, the upper part of the acoustic generator main body is connected with an air inlet pipe through an air inlet elbow, one side of the acoustic generator main body is provided with a front baffle, a movable ring disc is arranged in a cavity formed by the front baffle and the acoustic generator main body after being hermetically connected, one end of a transmission shaft is fixedly connected with the movable ring disc through the acoustic generator main body, and the other end of the transmission shaft is connected with a variable frequency speed control motor and fixed on an acoustic generator base; compared with the prior art, the structure is reasonable, the energy conversion efficiency is high, and the soot blowing effect is good.

Meanwhile, the chinese patent (CN202382260U) also discloses an acoustic wave generator, which comprises a base, an air source surge tank and a motor fixed on the base, a turntable base fixed on the base, a turntable cavity and a turntable sealing cover arranged outside the turntable base, a turntable with a plurality of air holes uniformly distributed in the turntable cavity, and a turntable driven to rotate by the motor fixed on the base inside through a rotating shaft; air inlet holes and air outlet holes are respectively arranged on the turntable base and the turntable sealing cover which correspond to the air vent holes, and a horn cylinder is arranged at the position of the air outlet hole on the outer side of the turntable sealing cover; the air source pressure stabilizing tank is provided with a small air inlet pipe and a large air outlet pipe, and the large air outlet pipe is communicated with the air inlet hole through an arc reducing bent pipe. Compared with the prior art, the device has the advantages of simple structure, high gas-sound conversion efficiency, wide audio frequency adjustment range and convenient operation, and is suitable for removing ash and slag of various furnaces and kilns.

However, in the actual working process of the acoustic wave soot blower or the acoustic wave generator, because the impeller cuts the compressed air in the air inlet pipe, the air inlet side of the acoustic wave soot blower or the acoustic wave generator always receives the flowing pressure of the compressed air, and as the impeller receives the air pressure in one direction in the air inlet pipe for a long time, the structure of the acoustic wave soot blower or the acoustic wave generator is deformed, and then the acoustic wave soot blower or the acoustic wave generator is abraded or damaged, so that the normal work is influenced. For this, the prior art does not provide a solution.

Therefore, in order to prolong the service life of the impeller in the sound wave generator and ensure the normal operation of the sound wave generator, the structural design of the sound wave generator needs to be improved.

Disclosure of Invention

The invention aims to solve the technical problems and provides an acoustic wave combustion-supporting device with a backpressure structure and an installation mode thereof.

In order to achieve the purpose, the invention provides the following scheme: the backpressure structure comprises a backpressure cavity communicated with an air inlet pipe, wherein the backpressure cavity is positioned on the air outlet side of an impeller, and the top of the impeller penetrates through the air inlet pipe and is exposed in the backpressure cavity.

Preferably, the back pressure chamber communicates with the intake pipe through a bypass, and an inlet of the bypass is opened near the inlet of the intake pipe.

The sound wave combustion-supporting device comprises a shell, wherein different end surfaces of the shell are respectively provided with an air inlet pipe mounting hole, a sound wave guide pipe mounting hole and a driving device mounting hole; wherein, the air inlet of the air inlet pipe is arranged at the mounting hole of the air inlet pipe, and the air outlet of the air inlet pipe extends to the mounting hole of the sound wave guide pipe from the inside of the shell; the acoustic waveguide is arranged at the mounting hole of the acoustic waveguide and is communicated with the air outlet of the air inlet pipe; the driving device is arranged at the mounting hole of the driving device and is connected with the transmission device; the transmission device is connected with the driving device and an impeller arranged in the shell; the impeller can penetrate through the air inlet pipe along the cross section direction of the air inlet pipe, and can cut flowing air in the air inlet pipe when rotating; the back pressure structure is also included.

Preferably, the end face of the air inlet pipe mounting hole is vertical to the end face of the acoustic waveguide mounting hole; the air inlet pipe is a tapered arc-shaped pipe.

Preferably, the sonic duct is a flared sonic duct; is connected with the air inlet pipe through a flange.

Preferably, the end face of the mounting hole of the driving device is parallel to the end face of the mounting hole of the sound wave guide tube, and the driving device is a variable frequency motor.

Preferably, the end face of the mounting hole of the driving device is parallel to the end face of the mounting hole of the sound wave guide tube, and the driving device is a variable frequency motor.

Preferably, the transmission device is a transmission shaft, and the transmission shaft is superposed with the central shafts of the variable frequency motor and the impeller; one end of the transmission shaft is connected with a driving shaft of the variable frequency motor, and the other end of the transmission shaft is connected with a rotating shaft of the impeller.

The installation mode of the sound wave combustion-supporting device is also provided, 9 sound wave combustion-supporting devices are respectively installed on four furnace walls of the boiler hearth, the sound wave combustion-supporting devices are arranged in a 3 multiplied by 3 mode, and each row of the sound wave combustion-supporting devices and the burners on each layer of the boiler hearth are located on the same plane.

Compared with the prior art, the invention has the following technical effects:

according to the invention, the backpressure structure is designed in the acoustic wave combustion-supporting device, the backpressure cavity communicated with the air inlet pipe is arranged on the air outlet side of the impeller, and the top of the impeller passes through the air inlet pipe and is exposed in the backpressure cavity, so that the same air pressure in the air inlet pipe is applied to the air outlet side of the impeller, the pressure on the air inlet side and the air outlet side of the impeller is balanced, the service life of the impeller is prolonged, and the normal operation of the acoustic wave generator is ensured.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.

FIG. 1 is a schematic structural diagram of a sonic combustion-supporting device with a backpressure structure according to the present invention;

FIG. 2 is a front view of the acoustic wave combustion supporting apparatus of the present invention after installation;

fig. 3 is a top view of the acoustic wave combustion-supporting device of the present invention after installation.

Wherein, 1-acoustic wave combustion-supporting device; 2-a boiler; 3-a burner; 11-shell, 12-air inlet pipe, 13-sound wave guide pipe, 14-variable frequency motor, 15-impeller, 16-back pressure cavity and 17-bypass.

Detailed Description

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.

The invention aims to provide an acoustic wave combustion-supporting device with a backpressure structure and an installation mode thereof.

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.

As shown in fig. 1, the present invention provides a back pressure structure for a sonic combustion-supporting device, which includes a back pressure cavity 16, wherein the back pressure cavity 16 is communicated with an air inlet pipe 12, and the communication modes of the back pressure cavity 16 and the air inlet pipe 12 are various, for example: a bypass 17 is provided between the back pressure chamber 16 and the inlet pipe 12; or a blind hole is formed in the back pressure chamber 16, and the hole is formed in the intake pipe 12.

The back pressure cavity 16 is located on the air outlet side of the impeller 15 (the right side of the impeller 15 in fig. 1), wherein the top of the impeller 15 continues to extend upward after passing through the air inlet pipe 12 until part of the air outlet side of the impeller 15 is exposed in the back pressure cavity 16, at this time, the air inlet side (the left side of the impeller 15 in fig. 1) of the impeller 15 is a shell, and the air outlet side is the back pressure cavity 16; because the impeller 15 will receive the flowing pressure of the compressed air in the air inlet pipe 12 at the air inlet side during the operation, and the impeller 15 will cause its structure to deform due to the long-term air pressure in one direction in the air inlet pipe 12, and then wear or damage occurs, after the impeller 15 extends through the air inlet pipe, a back pressure cavity 16 communicated with the air inlet pipe 12 is arranged at the air outlet side opposite to the air inlet side, and the same air pressure in the air inlet pipe 12 is applied to the air outlet side of the impeller 15, so that the pressures at the air inlet side and the air outlet side of the impeller 15 are balanced, and the service life of the impeller 15 is prolonged.

As shown in fig. 1, there is also provided an acoustic wave combustion-supporting device, which comprises a housing 11, an air inlet pipe 12, an acoustic wave guide pipe 13, an impeller 15 and a driving device; wherein, different end surfaces of the shell 11 are respectively provided with an air inlet pipe mounting hole, an acoustic wave guide mounting hole and a driving device mounting hole, an air inlet of the air inlet pipe 11 is mounted at the air inlet pipe mounting hole, and an air outlet thereof extends from the inside of the shell 11 to the acoustic wave guide mounting hole; the acoustic waveguide 13 is arranged at the mounting hole of the acoustic waveguide and is communicated with the air outlet of the air inlet pipe 12; the driving device is arranged at the mounting hole of the driving device and is connected with the transmission device; the transmission device is connected with the driving device and an impeller 15 arranged in the shell 11; the impeller 15 can penetrate through the air inlet pipe 12 along the cross section direction of the air inlet pipe 12, and the impeller 15 can cut flowing air in the air inlet pipe 12 when rotating; the back pressure structure is also included.

Furthermore, the end surface of the air inlet pipe mounting hole and the end surface of the acoustic wave guide pipe mounting hole can be perpendicular to each other or parallel to each other, or the air inlet pipe mounting hole and the acoustic wave guide pipe mounting hole can be arranged on the same plane; correspondingly, the air inlet pipe 12 only needs to be designed into an adaptive arc pipe, a straight pipe, a U-shaped pipe and the like; here, for the convenient arrangement of the impeller 15 and the transmission device in the housing 11 and the flowing effect of the compressed air, the air inlet pipe 12 is a tapered arc pipe, so that on one hand, the axes of the driving device, the transmission device and the impeller 15 can be overlapped, the structural design of the transmission device is simplified, and the transmission efficiency is improved; on the other hand, the gradually-reduced arc-shaped pipe can convey compressed air smoothly relative to other special-shaped pipe structures, interference of the structure on flowing of the compressed air is reduced, the compressed air can be effectively gathered, and the generation quality of subsequent sound waves is improved.

Further, the acoustic waveguide 13 is a flared acoustic waveguide, the flare of which may be circular or square, or may be designed into any shape according to actual requirements; the acoustic waveguide 13 is connected to the intake pipe 12 by a flange, and it should be noted that the connection of the intake pipe 12 and the acoustic waveguide 13 by a flange is a common connection method at present, but the present application is not limited to the flange connection, and may also adopt a connection method such as welding, screw connection, etc.

Furthermore, the end face of the mounting hole of the driving device and the end face of the mounting hole of the sound wave guide tube can be parallel or vertical to each other; the parallelism and the perpendicularity of the end surfaces where the two mounting holes are located mean that the structural design of the transmission device between the driving device and the impeller 15 is different, namely when the end surfaces where the two mounting holes are located are parallel, the axes of the driving device, the transmission device and the impeller 15 can be overlapped, the transmission device only needs to adopt a transmission shaft to connect the driving device with the impeller 15, wherein one end of the transmission shaft is connected with a driving shaft of the driving device, and the other end of the transmission shaft is connected with a rotating shaft of the impeller 15; when the end surfaces of the two mounting holes are perpendicular to each other, the axes of the driving device, the transmission device and the impeller 15 cannot be overlapped, and at the moment, a bevel gear needs to be arranged in the transmission device to change the transmission direction; in order to meet the requirement of controlling the change of the sound wave generation frequency, the driving device selects the variable frequency motor 14, namely the variable frequency motor is adopted to change the frequency of the compressed air cut by the impeller 15, thereby achieving the purpose of regulating and controlling the sound production frequency.

Furthermore, a plurality of openings are formed in the impeller 15 in the upward direction on the impeller 15 by taking the rotating shaft of the impeller 15 as the center, when the impeller 15 rotates, the openings are alternately arranged in the air inlet pipe 12, wherein the distance between the openings is larger than the diameter of the air inlet pipe 12 where the impeller 15 is located, so that in the actual working process, when the openings in the impeller 15 are aligned with the air inlet pipe 12, compressed air normally flows, and when the openings and the air inlet pipe 12 are staggered, the compressed air is blocked by the impeller 15, and the compressed air is continuously cut in the rotating process of the impeller 15, so that oscillation sound waves are generated; meanwhile, the intensity of the sound wave is directly related to the airflow flow, so that the intensity of the sound wave can be regulated and controlled only by regulating the rotating speed of the impeller 15 and then the airflow flow.

Furthermore, because the sound wave is a mechanical elastic wave, when an object moves, the medium connected with the sound wave causes changes of parameters such as pressure, particle velocity and the like, air is a basic medium for transmitting the sound wave, and when the elastic medium such as air meets the motion of the object, adjacent air generates compression expansion and sparse and dense periodic changes and alternately expands to the space from near to far. The high-frequency high-sound-intensity sound wave can make the medium produce displacement, speed and acceleration in the process of propagation, and the action intensity of the high-frequency high-sound-intensity sound wave is related to the magnitude of sound power. Therefore, on the basis, the strong sound waves can be used in the power station boiler to promote the combustion of the pulverized coal in the boiler and enhance the heat transfer of the heat exchanger, so that the comprehensive efficiency of the boiler is improved, the coal consumption is reduced, and the pollutant emission is reduced;

furthermore, a sound wave generator is arranged on the hearth to generate strong sound waves, and the high-frequency high-sound-intensity sound field generated by the sound wave generator accelerates the diffusion speed of fresh oxygen and also accelerates the speed of adsorption and diffusion of combustion products into flue gas. The sound wave can cause strong vibration of molecules and particles, so that strong mass exchange, momentum exchange and heat exchange among the particles of the coal powder, the molecules of the smoke and the particles of the smoke are accelerated, the burning-out time of the coal powder is shortened as a result of the exchange, and combustible substances of fly ash and slag are greatly reduced, thereby achieving the purposes of saving energy and reducing consumption. The forced oscillation method is utilized to convert the air flow of the blower into low-frequency oscillation sound waves, and the low-frequency strong sound waves can improve the combustion efficiency of the fire coal by more than 5 percent.

Therefore, as shown in fig. 2 and 3, the invention also provides an installation mode of the acoustic wave combustion-supporting device, wherein 9 acoustic wave combustion-supporting devices 1 are respectively installed on four furnace walls of a hearth of the boiler 1, the acoustic wave combustion-supporting devices 1 on each furnace wall are arranged in a 3 x 3 mode, and each row of acoustic wave combustion-supporting devices and the burners 3 on each layer of the hearth of the boiler 1 are located on the same plane.

Furthermore, a control system of the acoustic wave combustion-supporting device 1 can be arranged on site, a control cabinet of the acoustic wave combustion-supporting device 1 is placed near a hearth combustor, and attention needs to be paid to the fact that the control cabinet needs to be placed in a place where rain and sun are sheltered; the control cabinet can also be placed in an electronic room and controlled by a PLC (programmable logic controller), and the operation parameters are set; the sound wave combustion-supporting control system can be connected to a DCS system to start and stop, and can check the sound wave combustion-supporting operation condition through pictures and give an abnormal alarm.

By adopting the installation mode, the smoke abatement and combustion supporting are firstly realized, the smoke and the coal particles are relatively moved by the oscillating flow caused by sound waves, and the fuel products (such as ash shells) enclosed on the outer layer of the coal particles can be separated from the unburned particles in the coal particles, so that oxygen can be better contacted with the fuel particles, and the fuel combustion speed is accelerated; secondly, heat transfer is enhanced, and the sound wave can eliminate the coal particles and a temperature boundary layer near the heat transfer surface of the heat exchanger, so that the heat transfer is promoted, the sound wave assists in combustion and enhances the heat transfer, the heat efficiency of the boiler can be effectively improved, and the dust concentration and blackness of the discharged smoke are reduced; and thirdly, removing dust, wherein the flue gas contains fly ash with small particles and larger particles. The small particle fly ash in the smoke collides with each other by utilizing the aggregation of sound waves to polymerize into larger particles, the larger particle fly ash collides with each other and sinks under the action of gravity, so that the dust content of the smoke is reduced.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.