CN116026130B

CN116026130B - Drying device

Info

Publication number: CN116026130B
Application number: CN202310313367.8A
Authority: CN
Inventors: 王兵; 闻浩诚
Original assignee: Tsinghua University
Current assignee: Tsinghua University
Priority date: 2023-03-28
Filing date: 2023-03-28
Publication date: 2023-06-02
Anticipated expiration: 2043-03-28
Also published as: CN116026130A

Abstract

The invention discloses a drying device which comprises a drying chamber, a rotary detonation gas generator and an air inlet assembly, wherein a feeding port and a discharging exhaust port are arranged on a drying cavity, and the feeding port is positioned between an air inlet and the discharging exhaust port of the drying cavity. The rotary detonation gas generator comprises a combustion chamber which is connected with the end part of the gas inlet of the drying cavity, the combustion chamber is a hollow annular cavity, and the rotary detonation gas generator is provided with a fuel injection assembly and an ignition structure which are communicated with the combustion chamber. The air inlet assembly comprises an air inlet cavity communicated with the combustion chamber and an air source conveying device for conveying air to the air inlet cavity, and the air outlet end of the air inlet cavity is connected with the combustion chamber. The high-temperature and high-frequency periodic pulsating rotary airflow is formed in the combustion chamber of the rotary detonation gas generator, and the high-frequency periodic pulsating strong-shearing airflow of the rotary airflow entering the drying cavity is beneficial to strengthening the heat and mass transfer process, a heating device is not required, and the drying efficiency of the drying device is improved by the high-temperature and high-frequency periodic pulsating rotary airflow.

Description

Drying device

Technical Field

The invention relates to the technical field of material drying, in particular to a drying device.

Background

The drying device is used as common equipment for drying materials, and has wide application in various fields such as food, chemical industry and the like.

The traditional drying device comprises a drying chamber, an air inlet device and an electric heater, wherein hot air generated by the air blower and the electric heater is introduced into the drying chamber, and materials positioned in the drying chamber are dried.

However, because the electric heater is required to be arranged for drying the materials, the drying device has the advantages of complex system, high energy consumption, slower heat transfer and lower drying efficiency.

Therefore, how to improve the drying efficiency of the drying device is a technical problem to be solved by the person skilled in the art.

Disclosure of Invention

The invention aims to provide a drying device for improving the drying efficiency of the drying device.

To achieve the above object, the present invention provides a drying apparatus comprising:

the drying chamber is internally provided with a hollow drying cavity which is in an annular shape, the drying cavity is provided with a feed inlet and a discharge exhaust port, and the feed inlet is positioned between an air inlet of the drying cavity and the discharge exhaust port;

the rotary detonation gas generator comprises a combustion chamber connected with the gas inlet of the drying cavity, the combustion chamber is a hollow annular cavity, and the rotary detonation gas generator is provided with a fuel injection assembly and an ignition structure which are communicated with the combustion chamber;

the air inlet assembly comprises an air inlet cavity communicated with the combustion chamber and an air source conveying device for conveying air to the air inlet cavity, and the air outlet end of the air inlet cavity is connected with the combustion chamber.

Optionally, in the above drying device, the air intake assembly further includes an anti-back pressure air valve disposed in the air intake chamber, the anti-back pressure air valve including a gas reverse inhibition chamber with a gradually decreasing cross-sectional area along an air flow direction, so that a flow resistance in a reverse air intake direction is greater than a resistance in a forward flow direction, the forward flow direction being a direction in which the gas in the anti-back pressure air valve flows toward the air intake of the rotary detonation gas generator, and the reverse air intake direction being a direction in which the gas in the back pressure air valve flows toward the air intake of the air intake assembly; the cross-sectional areas of the two sides of the air inlet end of the air reverse inhibition cavity are smaller than the cross-sectional area of the air inlet end along the air flow direction.

Optionally, in the above drying device, the gas reverse suppressing chambers are provided with at least two along the gas flow direction.

Optionally, in the above drying device, an air inlet end of the air reverse suppressing chamber is provided with an air flow suppressing step protruding toward a center of the air reverse suppressing chamber.

Optionally, in the above drying device, the gas reverse inhibition cavity includes a main gas inlet cavity and a gas backflow cavity with two ends respectively communicated with an inlet end and an outlet end of the main gas inlet cavity, and two ends of the main gas inlet cavity are connected with the gas inlet cavity; along the air flow direction, the two ends of the main air inlet cavity and the air inlet cavity are arranged in equal cross sections, and the cross section area of the air return cavity is smaller than that of the main air inlet cavity.

Optionally, in the above drying device, the rotary detonation gas generator includes a generator inner ring and a generator outer ring sleeved outside the generator inner ring, the combustion chamber is formed between the generator inner ring and the generator outer ring, the fuel injection assembly includes a plurality of, a plurality of the fuel injection assemblies are circumferentially distributed along the generator outer ring, the fuel injection assembly and the ignition structure are both installed at the generator outer ring, and the ignition structure is located downstream of the fuel injection assembly along the air flow direction.

Optionally, in the above drying device, the air inlet assembly includes an air inlet guide plate and an air inlet outer cover sleeved on the outer side of the air inlet guide plate, the air inlet guide plate is a conical structure protruding towards the air inlet end of the air inlet cavity, the air inlet cavity is formed between the air inlet outer cover and the conical structure, and the cross-sectional area of the air inlet cavity is gradually reduced along the air flow direction.

Optionally, in the above drying device, the drying chamber includes a chamber inner ring, a chamber outer ring and an end plate, the chamber outer ring is sleeved outside the chamber inner ring, the end plate is connected with the chamber inner ring and the chamber outer ring, and seals off one end of the drying chamber away from the rotary detonation gas generator, the chamber inner ring and the chamber outer ring are connected with the rotary detonation gas generator, and the section area of an air inlet channel of the drying chamber along the air flow direction is gradually increased.

Optionally, in the above drying device, the chamber inner ring, the chamber outer ring and the end plate are an integrally formed structure.

Optionally, in the above drying device, the feed inlet includes a plurality of feed inlets, and the plurality of feed inlets are distributed along a wall surface of the drying cavity in a circumferential direction; the discharge exhaust ports are distributed along the circumferential direction of the wall surface of the drying cavity, and the discharge exhaust ports are tangential outlets along the drying cavity.

Optionally, in the above drying device, the drying device further comprises a material blocking net disposed in the drying cavity and/or the combustion chamber, and the material blocking net is located upstream of the feed inlet along the air flow direction.

Optionally, in the above drying apparatus, the fuel injection assembly is detachably connected to the combustion chamber.

Optionally, in the above drying device, a cooling device for cooling the rotary detonation gas generator is further included.

Optionally, in the above drying device, the cooling device includes a water-cooled cooler surrounding an outer wall of the rotary detonation gas generator.

Optionally, in the above drying device, the drying chamber, the rotary detonation gas generator and the gas inlet assembly are sequentially arranged from top to bottom, the feed inlet is located at the bottom end of the side wall of the drying chamber, and the discharge exhaust port is located at the top end of the side wall of the drying chamber.

In the technical scheme, the drying device provided by the invention comprises a drying chamber, a rotary detonation gas generator and an air inlet assembly, wherein the drying chamber is provided with a feed inlet and a discharge exhaust port, and the feed inlet is positioned between an air inlet and the discharge exhaust port of the drying chamber. The rotary detonation gas generator comprises a combustion chamber which is connected with a drying cavity air inlet, the combustion chamber is a hollow annular cavity, and the rotary detonation gas generator is provided with a fuel injection assembly and an ignition structure which are communicated with the combustion chamber. The air inlet assembly comprises an air inlet cavity communicated with the combustion chamber and an air source conveying device for conveying air to the air inlet cavity, and the air outlet end of the air inlet cavity is connected with the combustion chamber. Through setting up rotatory detonation gas generator for the gas that gets into in the rotatory detonation gas generator through the subassembly that admits air and the gas that gets into the combustion chamber ignites under the effect of ignition structure, forms high temperature, the rotatory air current of high frequency periodic pulsation in the combustion chamber, the air current gets into the drying chamber, and the material gets into the drying chamber through the feed inlet, is heated under the effect of rotatory air current, and is dry and is transported to ejection of compact gas vent under the air current effect at last, and is discharged by ejection of compact gas vent along with the air current.

According to the above description, in the drying device provided by the application, the high-temperature and high-frequency periodically-pulsed rotary air flow is formed in the combustion chamber of the rotary detonation gas generator, the high-frequency periodically-pulsed strong-shearing air flow of the rotary air flow entering the drying cavity is beneficial to strengthening the heat and mass transfer process, a heating device is not required, and the drying efficiency of the drying device is improved by the high-temperature and high-frequency periodically-pulsed rotary air flow.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.

Fig. 1 is an external view of a drying device according to an embodiment of the present invention;

fig. 2 is a cross-sectional view of a drying apparatus according to an embodiment of the present invention;

FIG. 3 is a cross-sectional view of another drying apparatus according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of a gas reverse suppressing chamber according to an embodiment of the present invention;

FIG. 5 is a schematic diagram of another embodiment of a gas reverse inhibition chamber;

FIG. 6 is a graph of tangential flow velocity profile of a rotary detonation gasifier outlet provided in an embodiment of the present invention.

Wherein in fig. 1-5:

1-air inlet assembly, 101-air inlet housing, 102-air inlet guide plate, 103-back pressure resistant pneumatic valve, 1031-gas reverse inhibition cavity, 10311-main air inlet cavity, 10312-gas backflow cavity, 1032-gas flow inhibition step and 1033-conical surface;

2-rotary detonation gas generator, 201-fuel injection assembly, 202-ignition structure, 203-generator outer ring, 204-generator inner ring;

3-drying chamber, 301-feeding port, 302-drying cavity, 303-discharging exhaust port and 304-air inlet;

4-material barrier net.

Detailed Description

The core of the invention is to provide a drying device to improve the drying efficiency of the drying device.

The present invention will be described in further detail below with reference to the drawings and embodiments, so that those skilled in the art can better understand the technical solutions of the present invention.

Please refer to fig. 1 to 6.

In a specific embodiment, the drying device provided by the embodiment of the invention comprises a drying chamber 3, a rotary detonation gas generator 2 and an air inlet assembly 1, wherein a feeding port 301 and a discharging air outlet 303 are arranged on a drying cavity 302, and the feeding port 301 is positioned between an air inlet 304 and the discharging air outlet 303 of the drying cavity 302.

The rotary detonation gas generator 2 comprises a combustion chamber which is connected with a gas inlet 304 of a drying cavity 302, and the combustion chamber is a hollow annular cavity. As shown in fig. 2, specifically, the cross section of the combustion chamber along the direction perpendicular to the center line may be circular arc or ring shape with polygonal cross section, and for the convenience of gas rotation, it is preferable that the polygonal angular position is smoothly transited.

The rotary detonation gas generator 2 is provided with a fuel injection assembly 201 in communication with the combustion chamber and an ignition structure 202. Specifically, the ignition structure 202 may be a spark plug. The fuel injection assembly 201 may be a fuel nozzle.

The air inlet assembly 1 comprises an air inlet cavity communicated with the combustion chamber and an air source conveying device for conveying air to the air inlet cavity, and the air outlet end of the air inlet cavity is connected with the combustion chamber.

In a specific embodiment, the discharge exhaust ports 303 include a plurality of discharge exhaust ports 303 circumferentially distributed along the wall surface of the drying cavity 302, and the discharge exhaust ports 303 are tangentially discharged along the wall surface of the drying cavity 302, that is, the discharge exhaust ports 303 are tangential outlets of the drying cavity 302, that is, the discharge exhaust ports 303 extend tangentially and outwardly along the wall surface of the drying cavity 302. The feed inlet 301 is located at the bottom end of the side wall of the drying chamber 3, and the discharge outlet 303 is located at the top end of the side wall of the drying chamber 3. The drying chamber 3 is internally provided with a hollow drying cavity 302 which is arranged in a ring shape, the drying chamber 3 can be in a ring shape, and the inlet of the drying chamber 3 is gradually expanded.

In specific operation, a plurality of feed inlets 301 and discharge exhaust ports 303 are arranged on the outer wall surface, materials are uniformly injected into the drying chamber 3 through the plurality of feed inlets 301 at the bottom, are rapidly dried in the pulsating rotary air flow at the outlet of the gas generator, rise along with tail gas, and the tail gas and the materials are discharged through the top discharge exhaust ports 303.

The combustion chamber is an annular combustion chamber, and is air and fuelThe material is sprayed into the combustion chamber, a self-sustaining and periodically continuously rotating detonation wave is formed in the combustion chamber after ignition, the expansion of the first-stage airflow after detonation is accelerated, and high-temperature fuel gas is discharged from the tail part of the combustion chamber to the drying chamber 3. The flow field of the rotary detonation in the rotary detonation gas generator 2 also has the following features: firstly, the airflow pressure after rotary knocking is continuously reduced, and the flow field pressure after a certain distance is lower than the inlet pressure, so that air can be sucked again independently without external air supply equipment; secondly, the high-frequency periodic pulsation of the rotary knocking flow field is realized, the knocking wave speed can reach 1000-2000 m/s, the rotation frequency of the detonation wave in the combustion chamber can reach thousands of hertz, the tangential velocity component of the outlet of the combustion chamber of the rotary knocking is extremely strong in non-uniformity and large in velocity fall, and the strong pulsation and strong shearing flow field can obviously strengthen the convection and heat and mass transfer processes; third, the rotary detonation combustion also has high thermal efficiency and NO _X The yield is small. Because the rotary detonation combustion has self-pressurization property, the thermodynamic cycle efficiency of the device can be improved, and the drying efficiency is further improved.

In one embodiment, the fuel injection assembly 201 is removably coupled to the combustion chamber, and the fuel injection assembly 201 may be a fuel nozzle. The fuel injector assembly 201 is independently replaceable, and is adaptable to a variety of gaseous fuels, including natural gas, and the fuel flow rate can be adjusted over a range to adjust the outlet gas stream temperature.

In a specific embodiment, the drying device further comprises cooling means for the rotary detonation gas generator 2. Specifically, the gas in the rotary detonation gas generator 2 can be cooled by cooling gas by providing air cooling channels in the inner and outer walls of the rotary detonation gas generator 2.

Preferably, the rotary detonation gas generator 2 is annular, and the inner wall and the outer wall of the rotary detonation gas generator 2 are provided with water cooling channels, so that the rotary detonation gas generator 2 can be cooled, and the rotary detonation gas generator 2 can work stably for a long time.

The drying device further comprises a material blocking net 4, specifically, the material blocking net 4 is arranged in the drying cavity 302, and also can be arranged in a combustion chamber, the material blocking net 4 is located at the upstream of the feeding hole 301 along the air flow direction, and materials are prevented from falling below the material blocking net 4. In view of the high gas temperature, it is preferable that the material blocking net 4 is a high temperature resistant wire mesh structure or a high temperature resistant nonmetallic material. Specifically, the size of the holes in the material blocking net 4 depends on the particle size of the material, and the present application is not particularly limited.

In particular, the drying device as a whole may be arranged obliquely, and for ease of installation, it is preferable that the drying chamber 3, the rotary detonation gas generator 2 and the gas intake assembly 1 are arranged in this order from top to bottom as shown in fig. 1 to 3.

By arranging the rotary detonation gas generator 2, the gas entering the rotary detonation gas generator 2 through the gas inlet assembly 1 and the gas entering the combustion chamber are ignited under the action of the ignition structure 202, a high-temperature and high-frequency periodically-pulsed rotary gas flow is formed in the combustion chamber, the gas flow enters the drying cavity 302, the material enters the drying cavity 302 through the feeding hole 301, is heated under the action of the rotary gas flow, is finally dried under the action of the gas flow, is conveyed to the discharge gas outlet 303, and is discharged from the discharge gas outlet 303 along with the gas flow.

As can be seen from the above description, in the drying device provided in the specific embodiment of the present application, the high-temperature and high-frequency periodic pulsating rotary airflow is formed in the combustion chamber of the rotary detonation gas generator 2, so that the high-frequency periodic pulsating strong-shear airflow of the rotary airflow entering the drying cavity 302 is helpful to strengthen the heat and mass transfer process, no heating device is required, the drying efficiency of the drying device is improved by the high-temperature and high-frequency periodic pulsating rotary airflow, and meanwhile, by adopting the drying device provided in the present application, no electric energy is required, the energy consumption is reduced, and the pollutant emission is less.

The air intake assembly 1 further comprises an anti-back pressure air valve 103 arranged in the air intake chamber, the anti-back pressure air valve 103 comprises a gas reverse suppressing chamber 1031 with a cross-sectional area gradually decreasing along the air flow direction, and the wall surface of the gas reverse suppressing chamber 1031 is preferably a conical surface 1033 so that the flow resistance in the reverse air intake direction is larger than the flow resistance in the forward flow direction. In a specific design, the flow resistance in the reverse intake direction may be one or at least twice the flow resistance in the forward flow direction, with the specific flow resistance being dependent on the actual need.

The forward flow direction is the direction of the gas flowing into the intake port of the rotary detonation gas generator 2 in the back pressure resistant pneumatic valve 103, that is, the direction of the gas flowing into the rotary detonation gas generator 2. The reverse air inlet direction is the direction of the air flowing into the air inlet of the air inlet assembly 1 in the back pressure pneumatic valve 103, namely the direction of the air flowing into the air inlet of the back pressure pneumatic valve 103. The cross-sectional area of both sides of the gas inlet end of the gas reverse-suppressing chamber 1031 in the gas flow direction is smaller than the cross-sectional area of the gas inlet end. Specifically, the anti-back pressure pneumatic valve 103 can be arranged at the inlet position of the rotary detonation gas generator 2, and can reduce the influence of the back pressure of the rotary detonation gas generator 2 on the gas supply and maintain the rotary detonation propagation.

The rotary knocking gas generator 2 adopts a self-air suction mode for air supply, so that air supply equipment is simplified, and construction cost and energy consumption are reduced. Of course, when the device is specifically used, external auxiliary air supply can be selected, the air inflow is increased, and the power of the device is improved.

As shown in fig. 4, the gas reverse suppressing chambers 1031 are provided with at least two in the gas flow direction. The gas reverse inhibition chambers 1031 may be specifically provided with 3 or 4, etc., and adjacent gas reverse inhibition chambers 1031 are sequentially connected, and by providing a plurality of gas reverse inhibition chambers 1031, gas backflow is further avoided.

In order to improve the gas flow reversal suppressing effect of the gas reversal suppressing chamber 1031, it is preferable that the gas inlet end of the gas reversal suppressing chamber 1031 is provided with a gas flow suppressing step 1032 protruding toward the center of the gas reversal suppressing chamber 1031. Specifically, the included angle between the gas flow suppressing step 1032 and the support of the tapered surface 1033 of the gas reverse suppressing cavity 1031 is an acute angle, and in order to facilitate gas flow guiding, it is preferable that the junction between the tapered surface 1033 and the gas flow suppressing step 1032 is smooth. By forming the plurality of zigzag structures in the plurality of gas flow restraining steps 1032, the gas flows in the gas flow restraining steps 1032 to be standing surfaces when the gas moves in the reverse direction, and the gas stagnates in the standing surfaces, thereby dissipating the kinetic energy to restrain the reverse transmission.

As shown in fig. 5, the gas reverse suppressing chamber 1031 includes a main gas inlet chamber 10311 and a gas return chamber 10312 having both ends respectively communicating with an inlet end and an outlet end of the main gas inlet chamber 10311, and both ends of the main gas inlet chamber 10311 are joined with the gas inlet chamber. Along the air flow direction, the two ends of the main air inlet chamber 10311 and the air inlet chamber are arranged in equal cross sections, and specifically, the two ends of the main air inlet chamber 10311 and the air inlet chamber can be both in a circular ring-shaped cavity structure. In the direction of the gas flow, the area of the gas return chamber 10312 is smaller than the area of the main gas inlet chamber 10311. One or at least two gas return chambers 10312 may be provided, and when there are a plurality of gas return chambers 10312, gas converging chambers are distributed along the circumferential direction of the main gas inlet chamber 10311, preferably, the intervals between two adjacent gas return chambers 10312 are equal.

In particular, to facilitate gas channeling, it is preferable that the junction of the primary inlet chamber 10311 and the gas return chamber 10312 be smooth and excessive. Specifically, the included angle between the air flow direction of the air outlet end of the air return chamber 10312 and the air flow direction of the main air inlet chamber 10311 may be an obtuse angle or a right angle. The shape of the gas return chamber 10312 along the direction of gas flow therein may be an arcuate configuration. Specifically, the gas return chamber 10312 has an arc-shaped structure in which the distance from the main gas inlet chamber 10311 increases gradually and then decreases gradually in the direction of the flow of the gas therein. As shown in fig. 5, the back pressure resistant pneumatic valve 103 is consistent with tesla's valve principle, where two gases (two in this case gas return chambers 10312) pass through the outer gas return chamber 10312 and converge at the dashed arrow, dissipating kinetic energy.

In fig. 3 and 4, the solid arrows are marked as the intake direction, the dashed arrows are marked as the reverse intake direction, and the aerodynamic resistance in the intake direction is much smaller than that in the reverse intake direction, thereby achieving a weakening effect on the back pressure of the downstream rotary detonation gas generator 2.

The rotary detonation gas generator 2 comprises an inner generator ring 204 and an outer generator ring 203 sleeved outside the inner generator ring 204, a combustion chamber is formed between the inner generator ring 204 and the outer generator ring 203, the fuel injection assemblies 201 comprise a plurality of fuel injection assemblies 201 which are distributed along the circumference of the outer generator ring 203. Preferably, adjacent fuel injection assemblies 201 are equally spaced.

The fuel injection assembly 201 and the ignition structure 202 are both mounted to the generator outer ring 203, and the ignition structure 202 is located downstream of the fuel injection assembly 201.

In the concrete assembly, the fuel injection assembly 201 is connected with the outer ring 203 of the generator through a flange, the fuel injection assembly 201 is of a hollow annular structure, gas fuel comprising natural gas is supplied from the outside, firstly enters a hollow gas collection cavity to play a certain buffering role, the fuel in the gas collection cavity is injected into the gas generator through a plurality of injection holes on the inner wall surface of the fuel injection assembly 201, fully mixed with air, enters an annular combustion chamber restrained by the outer ring 203 of the generator and the inner ring 204 of the generator, and is ignited and detonated by the ignition structure 202, so that rotary detonation waves which are propagated along the circumferential direction of the annular combustion chamber are formed, namely, a periodic continuous rotary detonation wave is formed at the head of the gas generator, and the gas flow after detonation is accelerated to expand and is discharged into the drying chamber 3.

When the rotary knocking gas generator 2 is started, stable rotary knocking combustion is not established in a flow field in the combustion chamber, self-air-suction capacity is not achieved yet, air is supplied through an air source of the air inlet component 1, and the rotary knocking gas generator can be separated from an external air source to work independently after combustion is stable. As shown in fig. 6, the tangential velocity component of the wake discharged from the stably operating rotary detonation gas generator 2 can reach hundreds of meters per second, and the spatial distribution is strong in non-uniformity and large in variance, so that the convection and heat and mass transfer processes can be enhanced. In particular, the temperature of the outlet gas stream of the rotary detonation gas generator 2 can be controlled by adjusting the fuel quantity in operation.

The air inlet assembly 1 comprises an air inlet guide plate 102 and an air inlet outer cover 101 sleeved outside the air inlet guide plate 102, preferably, the air inlet guide plate 102 and the generator inner ring 204 can be integrally formed, the connection position is reduced, and the tightness is improved.

As shown in fig. 2 and 3, the air intake guide plate 102 has a tapered structure protruding toward the air intake end of the air intake chamber, and an air intake chamber is formed between the air intake housing 101 and the tapered structure, and the cross-sectional area of the air intake chamber gradually decreases in the air flow direction. The air inlet cavity plays a certain rectifying role, and can be selectively connected with external air supply equipment (such as a blower) through a flange or not so as to provide additional air inlet and improve drying power; the anti-backpressure pneumatic valve 103 has the ability to attenuate the gasifier backpressure to attenuate the effect on the intake air of the rotary detonation gasifier 2. The cross-sectional area of the inlet chamber is gradually reduced to reduce the effect on the outlet flow field of the rotary detonation gas generator 2.

Specifically, the drying chamber 3 includes a chamber inner ring, a chamber outer ring and an end plate, the chamber outer ring is sleeved outside the chamber inner ring, the end plate is connected with the chamber inner ring and the chamber outer ring, and the end plate is used for blocking one end of the drying cavity 302 away from the rotary detonation gas generator 2, the chamber inner ring and the chamber outer ring are connected with the rotary detonation gas generator 2, and the section area of the air inlet end of the drying cavity 302 along the air flow direction is gradually increased. A drying chamber 302 is formed between the chamber inner ring, the chamber outer ring and the end plates.

Wherein, the outer ring and the inner ring of the cavity are respectively connected with the corresponding outer shell of the rotary detonation gas generator 2 through flanges, the outlet air flow of the rotary detonation gas generator 2 is discharged into the annular cavity of the drying chamber 3 to form high-temperature and high-frequency periodical pulsating rotary air flow, and the materials are sprayed into the drying chamber 302 through a plurality of feeding holes arranged on the outer wall surface of the drying chamber 302, dried and conveyed to the top of the drying chamber 302 under the action of the air flow and discharged from the discharging exhaust port 303.

In order to improve the assembly efficiency, the chamber inner ring, the chamber outer ring and the end plate are preferably integrally formed.

In a specific embodiment, the feeding ports 301 include a plurality of feeding ports 301, materials enter through the plurality of feeding ports 301, the plurality of feeding ports 301 are circumferentially distributed along the wall surface of the drying cavity 302, the materials enter through the feeding ports 301, and the number of the feeding ports 301 is 2-8, and specifically can be 4-6. Preferably, the adjacent two inlets 301 are equally spaced to improve flow uniformity in the drying chamber 3.

In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A drying apparatus, comprising:

the drying device comprises a drying chamber (3), wherein a hollow drying cavity (302) which is annularly arranged is arranged in the drying chamber (3), a feeding hole (301) and a discharging exhaust port (303) are arranged on the drying cavity (302), and the feeding hole (301) is positioned between an air inlet (304) of the drying cavity (302) and the discharging exhaust port (303);

the rotary detonation gas generator (2), the rotary detonation gas generator (2) comprises a combustion chamber connected with a gas inlet (304) of the drying cavity (302), the combustion chamber is a hollow annular cavity, and the rotary detonation gas generator (2) is provided with a fuel injection assembly (201) and an ignition structure (202) which are communicated with the combustion chamber;

the air inlet assembly (1), the air inlet assembly (1) comprises an air inlet cavity communicated with the combustion chamber and an air source conveying device for conveying air to the air inlet cavity, and an air outlet end of the air inlet cavity is connected with the combustion chamber.

2. The drying apparatus according to claim 1, wherein the gas inlet assembly (1) further comprises an anti-back pressure pneumatic valve (103) provided in the gas inlet chamber, the anti-back pressure pneumatic valve (103) comprising a gas reverse inhibition chamber (1031) having a gradually decreasing cross-sectional area in the gas flow direction such that the flow resistance in the reverse gas inlet direction is greater than the flow resistance in the forward flow direction, the forward flow direction being the direction of gas flow in the anti-back pressure pneumatic valve (103) to the gas inlet of the rotary detonation gas generator (2), the reverse gas inlet direction being the direction of gas flow in the anti-back pressure pneumatic valve (103) to the gas inlet of the gas inlet assembly (1); the cross-sectional area of both sides of the gas inlet end of the gas reverse suppressing chamber (1031) is smaller than the cross-sectional area of the gas inlet end in the gas flow direction.

3. Drying apparatus according to claim 2, wherein the gas reverse inhibition chamber (1031) is provided with at least two in the gas flow direction.

4. The drying apparatus according to claim 2, wherein an air inlet end of the air reverse suppressing chamber (1031) is provided with an air flow suppressing step (1032) protruding toward a center of the air reverse suppressing chamber (1031).

5. The drying apparatus according to claim 2, wherein the gas reverse inhibition chamber (1031) comprises a main gas inlet chamber (10311) and a gas return chamber (10312) with two ends respectively communicated with an inlet end and an outlet end of the main gas inlet chamber (10311), and two ends of the main gas inlet chamber (10311) are connected with the gas inlet chamber; along the air flow direction, the two ends of the main air inlet cavity (10311) are arranged with the air inlet cavity in a uniform cross section, and the cross section area of the air return cavity (10312) is smaller than that of the main air inlet cavity (10311).

6. The drying apparatus according to claim 1, wherein the rotary detonation gas generator (2) comprises an inner generator ring (204) and an outer generator ring (203) sleeved outside the inner generator ring (204), the combustion chamber is formed between the inner generator ring (204) and the outer generator ring (203), the fuel injection assembly (201) comprises a plurality of fuel injection assemblies (201) distributed circumferentially along the outer generator ring (203), the fuel injection assemblies (201) and the ignition structure (202) are both mounted on the outer generator ring (203), and the ignition structure (202) is located downstream of the fuel injection assembly (201) in the air flow direction.

7. The drying device according to claim 6, wherein the air inlet assembly (1) comprises an air inlet guide plate (102) and an air inlet outer cover (101) sleeved outside the air inlet guide plate (102), the air inlet guide plate (102) is a conical structure protruding towards the air inlet end of the air inlet cavity, the air inlet cavity is formed between the air inlet outer cover (101) and the conical structure, and the cross-sectional area of the air inlet cavity is gradually reduced along the air flow direction.

8. The drying device according to claim 1, wherein the drying chamber (3) comprises a chamber inner ring, a chamber outer ring and an end plate, the chamber outer ring is sleeved outside the chamber inner ring, the end plate is connected with the chamber inner ring and the chamber outer ring and seals off one end of the drying chamber (302) away from the rotary detonation gas generator (2), the chamber inner ring and the chamber outer ring are connected with the rotary detonation gas generator (2), and the section area of an air inlet channel of the drying chamber (302) along the air flow direction is gradually increased.

9. The drying apparatus of claim 8, wherein the chamber inner ring, the chamber outer ring, and the end plate are of an integrally formed construction.

10. The drying apparatus according to claim 1, wherein the feed opening (301) includes a plurality of feed openings (301) distributed circumferentially along a wall surface of the drying chamber (302); the discharge exhaust ports (303) comprise a plurality of discharge exhaust ports (303) which are circumferentially distributed along the wall surface of the drying cavity (302), and the discharge exhaust ports (303) are outlets tangentially arranged along the drying cavity (302).

11. The drying apparatus according to claim 1, further comprising a material barrier web (4) arranged in the drying chamber (302) and/or in the combustion chamber, the material barrier web (4) being located upstream of the feed opening (301) in the direction of the air flow.

12. The drying apparatus according to claim 1, wherein the fuel injection assembly (201) is detachably connected to the combustion chamber.

13. Drying apparatus according to claim 1, further comprising cooling means for cooling the rotary detonation gas generator (2).

14. Drying apparatus according to claim 13, characterized in that the cooling means comprise a water-cooled cooler surrounding the outer wall of the rotary detonation gas generator (2).

15. The drying apparatus according to any one of claims 1-14, wherein the drying chamber (3), the rotary detonation gas generator (2) and the gas inlet assembly (1) are arranged in sequence from top to bottom, the feed inlet (301) is located at the bottom end of the side wall of the drying chamber (3), and the discharge exhaust port (303) is located at the top end of the side wall of the drying chamber (3).