CN112178637B

CN112178637B - Flame stabilizing device convenient to adjust incoming flow

Info

Publication number: CN112178637B
Application number: CN202010823984.9A
Authority: CN
Inventors: 高怡; 王晓阳; 傅宸
Original assignee: Shanghai Jiaotong University
Current assignee: Shanghai Jiaotong University
Priority date: 2020-08-17
Filing date: 2020-08-17
Publication date: 2021-08-03
Anticipated expiration: 2040-08-17
Also published as: CN112178637A

Abstract

The invention relates to a flame stabilizing device convenient for adjusting incoming flow, which comprises an incoming flow adjusting section, a flow stabilizing section and an observing section which are sequentially connected, wherein the incoming flow adjusting section comprises a feeding shell, a stabilizing shell and a feeding shell which are sequentially connected, one end of the feeding shell is connected with a feeding fuel pipe, the other end of the feeding shell is connected with the stabilizing shell, a feeding air pipe and an igniter are arranged on the side surface of the feeding shell, one end of the feeding shell, far away from the stabilizing shell, is connected with the flow stabilizing section, and the feeding shell is provided with a supplementary fuel pipe and a supplementary air pipe. Compared with the prior art, the invention has the advantages of adjustable different incoming flow conditions, good flow stabilizing effect, stability, reliability, convenient use, convenient installation and the like.

Description

Flame stabilizing device convenient to adjust incoming flow

Technical Field

The invention relates to the field of flame stabilizers, in particular to a flame stabilizing device convenient for adjusting incoming flow.

Background

A flame holder, also known as a "flame holder", is a device used to hold a flame steady in a combustion apparatus. The flame stabilizer in the prior art mostly solves the stability problem caused by external interference in the flame combustion process, for example, the invention with the publication number of CN104896510B discloses a flame stabilizer, which comprises a central ring and a plurality of radial struts uniformly fixed on the outer ring surface of the central ring along the radial direction, wherein the ring body and the radial struts of the central ring are both composed of groove-shaped structural members, the directions of the notches of the central ring and the radial struts are the same, airflow channels are arranged in the groove-shaped structural members, the airflow channels are communicated with the outside through a plurality of air injection holes arranged at the groove bottom, and the airflow channels in the central ring and the radial struts are communicated with each other to form an airflow cavity with the shape corresponding to the flame stabilizer.

The flame stabilizer only aims at the stability problem of fuel gas under the impact of high-speed airflow, does not consider the incoming flow regulation of flame, and has defects in the stability consideration of flame.

In the prior art, the inflow condition of the flame is considered, but the factors such as pressure, oxygen content and flow rate are coupled together for adjustment, and the influence of a certain factor on the flame stability cannot be independently researched.

Disclosure of Invention

The present invention is directed to overcoming the above-mentioned drawbacks of the prior art and providing a flame stabilizing device capable of independently adjusting different factors of an incoming flow to facilitate the adjustment of the incoming flow.

The purpose of the invention can be realized by the following technical scheme:

the utility model provides a flame stabilizing device convenient to adjust incoming flow, is including the incoming flow regulation section, stationary flow section and the observation section that connect gradually, the incoming flow regulation section is including the feeding shell that connects gradually, stabilizing shell and feed supplement shell, the one end of feeding shell is connected with the feeding fuel pipe, and the other end is connected stabilize the shell, the side of feeding shell is equipped with feeding air pipe and igniter, the feed supplement shell is kept away from the one end of stabilizing the shell is connected the stationary flow section, the feed supplement shell is equipped with the feed supplement fuel pipe and supplements the air pipe.

Further, the air inlet direction of feeding air pipe is deviated the center of feeding shell, the supplementary air pipe with the feeding air pipe is located same plumb plane, the supplementary air pipe with the air inlet direction of feeding air pipe is opposite.

Further, the steady flow section includes steady flow square pipe and steady flow honeycomb panel, the both ends of steady flow square pipe are connected respectively the feed supplement shell with the observation section, the steady flow honeycomb panel is located the inside of steady flow square pipe is and be located be close to in the steady flow square pipe one side of feed supplement shell.

Further, the steady flow square tube is connected with the feeding shell and the observation section through square flanges respectively.

Further, the steady flow section also comprises a sensor, and the sensor is connected with the steady flow square tube and is used for detecting incoming flow in the steady flow square tube.

Further, the observation section includes switching unit and observation unit, the switching unit is connected respectively stationary flow section and observation unit, the observation unit is equipped with the transparent window that is used for observing.

Furthermore, the observation unit comprises an observation window frame, an observation window structure and a closed structure, wherein the observation window frame is respectively connected with the observation window structure, the switching unit and the closed structure to form an observation chamber.

Further, the observation window structure includes observation window, sealing washer, cover plate and film, the quantity of sealing washer is two, cover plate, a sealing washer, observation window, a sealing washer and film connect gradually.

Furthermore, the cover plate is detachably connected with the bottom plate, so that the cover plate, the sealing ring, the observation window, the sealing ring and the bottom plate are integrally fixed;

the film is detachably connected with the observation window frame, so that the observation window structure and the observation window frame are fixed.

Furthermore, the closed structure comprises a fifth square flange and a second square adapter pipe, the second square adapter pipe is respectively connected with the observation window frame and the fifth square flange, and the fifth square flange is used for adapting to the closed cavity.

Further, the switching unit is provided with an inflow adjusting plate, the inflow adjusting plate is provided with a plurality of holes, and the inflow adjusting plate performs inflow adjustment by setting the diameter and distribution density of the holes.

Compared with the prior art, the invention has the following advantages:

(1) according to the invention, the feeding air pipe and the igniter are arranged at the feeding end of the incoming flow adjusting section, so that the temperature (oxygen content) of the incoming flow can be adjusted; the supplementary fuel pipe and the supplementary air pipe are added at the supplementary material end, and the flow speed and the pressure of the incoming flow can be adjusted (the pressure of the device is adjusted by connecting the flange at the outlet end, namely the fifth square flange, with the low-pressure environment), so that the device can realize the coupling and decoupling of a plurality of incoming flow factors, complete the research on the influence of different factors on the flame stability, and ensure that the flame stability is higher.

(2) The stable shell can reduce the height of flame, and prevent the bottom heating flame from igniting the upper fuel; the steady flow section plays a role in stabilizing the flow, and the observation section is convenient for observing the condition of the fuel gas, so that the incoming flow is regulated.

(3) The supplementary air pipe and the feeding air pipe are positioned on the same vertical plane and have opposite air inlet directions, so that the rotational flows generated by the two air pipes are offset, and the flow stabilization is facilitated.

(4) The steady flow square pipe is connected with the material supplementing shell through the square flange, and can be disassembled and assembled through the bolt, so that the pipe diameter of the steady flow pipe of the steady flow honeycomb panel can be conveniently changed or other steady flow materials can be used according to the steady flow effect.

(5) The observation unit includes observation window frame, four observation window structures and enclosed construction, can all-round observation flame, and the observation window structure includes observation window, sealing washer, cover plate and film, and the inside and outside both sides of observation window all are equipped with the sealing washer, and when the environment of combustion chamber was the high pressure, the outside gasket atress, low pressure is vice versa, adapts to the needs of different environment from this to easily take off the washing.

Drawings

FIG. 1 is a schematic diagram of the general configuration of a flame holding apparatus of the present invention for facilitating regulation of incoming flow;

FIG. 2 is a schematic diagram of the structure of an incoming flow regulation section;

FIG. 3 is a perspective view of an inflow adjustment segment;

FIG. 4 is a perspective view of the construction of the flow stabilizer;

FIG. 5 is a schematic view of the installation state of the steady flow cellular board;

FIG. 6 is a schematic view of the structure of the observation section;

FIG. 7 is an exploded view of the viewing section;

FIG. 8 is a front view of the viewing window arrangement;

FIG. 9 is a view taken along line A of FIG. 8;

FIG. 10 is a schematic view showing an installation state of an inflow adjustment plate;

FIG. 11 is a schematic view of a recess provided in the viewing window;

in the figure, 1, incoming flow regulating section, 11, feeding housing, 12, stabilizing housing, 13, feeding housing, 14, feeding fuel pipe, 15, feeding air pipe, 16, igniter, 17, supplementary fuel pipe, 18, supplementary air pipe, 19, first square flange, 2, steady flow section, 21, steady flow square pipe, 22, steady flow honeycomb plate, 23, sensor, 24, second square flange, 25, third square flange, 3, observation section, 31, observation window frame, 32, observation window structure, 321, observation window, 322, sealing ring, 323, cover plate, 324, bottom plate, 325, recess, 33, closing structure, 331, fifth square flange, 332, second adapter square pipe, 34, incoming flow regulating plate, 35, fourth square flange, 36, first adapter square pipe.

Detailed Description

The invention is described in detail below with reference to the figures and specific embodiments. The present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.

Example 1

As shown in fig. 1, the present embodiment provides a flame stabilizing device for conveniently adjusting incoming flow, which can adjust different incoming flow conditions (incoming flow temperature (oxygen content), flow rate and velocity distribution, pressure), and generally includes an incoming flow adjusting section 1, a steady flow section 2, and an observation section 3, which are connected in sequence.

Each part is described in detail below.

1. Inflow regulation section 1

As shown in fig. 2 and 3, the inflow regulation section 1 comprises a feeding housing 11, a stabilizing housing 12 and a feeding housing 13 which are connected in sequence, wherein one end of the feeding housing 11 is connected with a feeding fuel pipe 14, the other end is connected with the stabilizing housing 12, a feeding air pipe 15 and an igniter 16 are arranged on the side surface of the feeding housing 11, one end of the feeding housing 13 far away from the stabilizing housing 12 is connected with a first square flange 19, the flow stabilization section 2 is flanged through the first square flange 19, and the feeding housing 13 is provided with a feeding fuel pipe 17 and a feeding air pipe 18.

The air intake direction of the feeding air pipe 15 is deviated from the center of the feeding housing 11, the supplementary air pipe 18 is located on the same vertical plane as the feeding air pipe 15, and the air intake direction of the supplementary air pipe 18 is opposite to that of the feeding air pipe 15. All the parts of the inflow adjusting section 1 are welded and sealed, and the sealing performance is ensured.

Working principle of the inflow regulation section 1:

if the incoming air needs to be heated, the incoming air is fed by the lower feed air pipe 15 and the feed fuel pipe 14, and the igniter 16 is ignited, and the feed air pipe 15 is offset in pipe to reduce the volume of the flame. The air inlet of the upper end supplementary air pipe 18 is also offset, the air inlet amount of the upper end air is larger than that of the upper end fuel, and the arrangement of the embodiment enables the air inlet flow of the supplementary air pipe 18 to be offset with the rotational flow generated by the downstream feeding air pipe 15, so that the stable flow is facilitated. The middle flame stabilizing jacket 12 can reduce the height of the flame and prevent the bottom flame from igniting the top fuel.

If heating is not needed, air is fed from the upper air inlet and the lower air inlet (namely the feeding air pipe 15 and the supplementary air pipe 18), fuel is fed from the feeding fuel pipe 14, the lower end of the feeding fuel pipe is fully mixed through rotational flow, and the air at the upper end counteracts the rotational flow to achieve the purpose of stabilizing the flow.

2. Stationary flow section 2

As shown in fig. 4 and 5, the flow stabilizing section 2 includes a flow stabilizing square tube 21 and a flow stabilizing honeycomb plate 22, two ends of the flow stabilizing square tube 21 are respectively connected to the supplementary material housing 13 and the observation section 3, and the flow stabilizing honeycomb plate 22 is located inside the flow stabilizing square tube 21 and on one side of the flow stabilizing square tube 21 close to the supplementary material housing 13.

The steady flow square tube 21 is connected with the feeding shell 13 through a second square flange 24, is connected with the observation section 3 through a third square flange 25, and is provided with a sealing ring at the connection part of the feeding shell 13 and the observation section 3.

The steady flow section 2 further comprises a sensor 2, and the sensor 23 is connected with the steady flow square tube 21 and used for detecting incoming flow in the steady flow square tube 21.

In the present embodiment, the sensors connected to the steady flow square tube 21 include an oxygen sensor, a temperature sensor, and a pressure sensor.

The working principle of the steady flow section 2 is as follows:

the main purpose of the flow stabilizer 2 is to stabilize the flow, in that the second square flange 24 in the lower connection transforms the circular cross section into a square shape, the size of the inner tube interface at the head and the middle part is unchanged.

Firstly, a rod piece for supporting the steady flow cellular board 22 is fixed on the second square flange 24 by bolts, so that the pipe diameter of the steady flow pipe of the steady flow cellular board 22 can be conveniently changed or other steady flow materials can be used according to the steady flow effect. The upper end of the flow stabilizing square tube 21 is fixed on the tube wall by a sensor 23 and is used for measuring the physical parameters of the incoming flow.

3. Observation section 3

As shown in fig. 6 and 7, the observation segment 3 includes a switching unit and an observation unit, the switching unit is respectively connected with the steady flow segment 2 and the observation unit, and the observation unit is provided with a transparent window for observation.

The observation unit comprises an observation window frame 31, an observation window structure 32 and a closed structure 33, wherein the observation window frame 31 is respectively connected with the observation window structure 32, the switching unit and the closed structure 33 to form an observation chamber.

The switching unit comprises a fourth square flange 35 and a first switching square pipe 36 which are connected in sequence, and switching is completed.

As shown in fig. 8 and 9, the observation window structure 32 includes two observation windows 321, two sealing rings 322, a cover plate 323, and a bottom plate 324, and the cover plate 323, one sealing ring 322, the observation windows 321, one sealing ring 322, and the bottom plate 324 are connected in sequence. The observation window 321 is a quartz observation window.

The sealing structure 33 includes a fifth square flange 331 and a second square adapter tube 332, the fifth square flange 331 is connected to the observation window frame 31 and the second square adapter tube 332, and the second square adapter tube 332 is used for adapting to a sealed cavity.

The switching unit is provided with an inflow adjustment plate 34, the inflow adjustment plate 34 is provided with a plurality of holes, and the inflow adjustment plate 34 performs inflow adjustment by setting the diameter and distribution density of the holes.

Equivalently, as shown in fig. 6, the observation section 3 is mainly formed by two square flanges and two adapter square pipes at two ends to complete the adapter; the middle is a flame flow field observation area. The uppermost fifth square flange 331 can be continuously connected to the closed cavity, if the connected cavity is low pressure, the whole burner is in a low pressure environment, and if the connected cavity is high pressure, the whole burner is in a high pressure environment; if the air is directly connected with the atmosphere, the environment is normal pressure.

The central observation area is the main part of the head observation section 3, and includes an observation window frame 31 and four observation window structures 32, each observation window structure 32 is composed of an observation window 321, a sealing ring 322, a cover plate 323 and a bottom plate 324, and the positional relationship therebetween is shown in the sectional view of fig. 9.

The two sealing rings 322, the observation window 321, the cover plate 323 and the bottom plate 324 form a whole in sequence of the cover plate 323, the sealing ring 322, the observation window 321, the sealing ring 322 and the bottom plate 324, the bolts fix the five sealing rings through the through holes in the cover plate 323 and the threaded holes in the bottom plate 324, and the whole is fixed on the frame through the bolts.

The observation window 321 is fixed on the observation window frame 31 by the bottom plate 324, and when in use, the observation window is firstly fixed in a whole body formed by five parts, and the whole body is fixed through the through hole on the bottom plate and the threaded hole on the frame.

The inside and outside of the observation window 321 are respectively provided with a sealing ring 322, when the environment of the combustion chamber is high pressure, the external sealing ring 322 is stressed, and vice versa, thereby being suitable for the requirements of different environments. In the aspect of size design, the internal sectional area is the same as the size of the steady flow section 2 by the multiple coordination sizes (the observation window frame 31, the quartz observation window, the sealing ring and the cover plate), so that the stability of the flow can be ensured to the maximum extent; meanwhile, the width of the inner section is equal to that of the quartz observation window, so that the flame can be observed in all directions.

If non-uniform incoming flow is required, an incoming flow adjusting plate 34 is added at the inlet of the head, and the uniform incoming flow is changed into target non-uniform incoming flow through the diameter and density of holes, as shown in fig. 10.

The connection among all parts fully ensures the uniformity of the flow field, is not interfered by the shape of the inner surface, and can adjust the incoming flow distribution by controlling the incoming flow adjusting plate.

The connection of the quartz observation window and the metal part realizes sealing through the arrangement of the sealing ring 322, the problem that the thermal expansion coefficients of quartz and metal are different under the high-temperature condition of combustion is guaranteed by reserving the gap between the observation window 321 and the metal frame, and meanwhile, the sealing ring 322 is arranged inside and outside, so that different combustion conditions of high pressure and low pressure are met. By means of the coordination of the structural dimensions, the same internal cross section of the part as before is achieved, without disturbing the flow. The design makes the observation window 321 easy to take off and wash: the bolts on the bottom plate 324 are unscrewed.

Flame stabilizers may be provided within the viewing area for further flame stabilization, as described in more detail below.

Fixing the flame stabilizer: as shown in fig. 11, a recess 325 with a shape similar to the shape of the stabilizer is formed on the observation window 321, the size of the recess is one turn larger, and a gasket is arranged in the gap to adapt to the size change of the cylindrical stabilizer and the observation window under the action of thermal expansion and cold contraction under the action of flame.

Connection between the stabilizer and the observation window: the stabilizer is suspended and stabilized in a flow field without redundant support, interference to the flow field is reduced, and in the aspect of size, thermal expansion is considered, so that the size of a clamping groove on the observation window is slightly larger than the stable size, and the installation is convenient.

The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.

Claims

1. The utility model provides a flame stabilization device convenient to adjust incoming flow, its characterized in that, including incoming flow regulation section (1), stationary flow section (2) and the observation section (3) that connect gradually, incoming flow regulation section (1) is including feeding shell (11), stable shell (12) and feed supplement shell (13) that connect gradually, the one end of feeding shell (11) is connected with feeding fuel pipe (14), and the other end is connected stable shell (12), the side of feeding shell (11) is equipped with feeding air pipe (15) and some firearm (16), feed supplement shell (13) are kept away from the one end of stable shell (12) is connected stationary flow section (2), feed supplement shell (13) are equipped with supplementary fuel pipe (17) and supplementary air pipe (18).

2. A flame stabilizing device for facilitating the regulation of incoming flow according to claim 1 wherein the intake direction of said feed air duct (15) is offset from the center of said feed housing (11), said supplementary air duct (18) is in the same vertical plane as said feed air duct (15), and said supplementary air duct (18) is in the opposite direction to the intake direction of said feed air duct (15).

3. The flame stabilizing device convenient for regulating the incoming flow according to claim 1, wherein the steady flow section (2) comprises a steady flow square pipe (21) and a steady flow cellular board (22), two ends of the steady flow square pipe (21) are respectively connected with the feeding shell (13) and the observation section (3), and the steady flow cellular board (22) is located inside the steady flow square pipe (21) and on one side of the steady flow square pipe (21) close to the feeding shell (13).

4. A flame stabilizing device for facilitating the regulation of incoming flow according to claim 3, wherein said flow stabilizing square tube (21) connects said feeding housing (13) and said observation section (3) by square flanges, respectively.

5. The flame stabilizing device for facilitating the regulation of incoming flow according to claim 3, wherein the steady flow section (2) further comprises a sensor (23), the sensor (23) is connected with the steady flow square tube (21) and is used for detecting the incoming flow in the steady flow square tube (21).

6. A flame stabilizing device for facilitating regulation of incoming flow according to claim 1, wherein the observation section (3) comprises a switching unit and an observation unit, the switching unit is connected with the steady flow section (2) and the observation unit respectively, and the observation unit is provided with a transparent window for observation.

7. A flame stabilizing device for facilitating the regulation of incoming flow according to claim 6, wherein the observation unit comprises an observation window frame (31), an observation window structure (32) and a closing structure (33), the observation window frame (31) connecting the observation window structure (32), the adapter unit and the closing structure (33) respectively, forming an observation chamber.

8. A flame stabilizing device for facilitating the regulation of incoming flow according to claim 7, characterized in that the said viewing window structure (32) comprises a viewing window (321), two sealing rings (322), a cover plate (323) and a bottom plate (324), the said cover plate (323), one sealing ring (322), the said viewing window (321), one sealing ring (322) and the bottom plate (324) are connected in turn.

9. A flame stabilizing device for facilitating the regulation of incoming flow according to claim 8 wherein said cover plate (323) is removably attached to said base plate (324) to effect the integral attachment of said cover plate (323), a sealing ring (322), said viewing window (321), a sealing ring (322) and base plate (324);

the bottom sheet (324) is detachably connected with the observation window frame (31) to realize the fixation of the observation window structure (32) and the observation window frame (31).

10. A flame stabilizing device for facilitating the regulation of incoming flow according to claim 6, wherein said adaptor unit is provided with an incoming flow regulating plate (34), the incoming flow regulating plate (34) is provided with a plurality of holes, and said incoming flow regulating plate (34) is provided with incoming flow regulation by setting the diameter and distribution density of the holes.