CN105627317B - Rapidly mixing tubulose flame burner with axial jet - Google Patents

Abstract

The invention relates to a rapid mixing tubular flame burner with axial jet. According to the burner of the present invention, it includes a burner body and an axial jet device, the burner body has a swirl mixing chamber inside; the burner body also includes at least two air streams that communicate with the swirl mixing chamber tangentially along the swirl mixing chamber Entrance. The fuel and oxidant of the present invention are respectively injected into the burner from tangential slit inlets evenly distributed on the circumference, which can prevent flashback or even explosion under the condition of low flow rate or high oxygen concentration or even pure oxygen. The invention utilizes aerodynamic characteristics to form a layer of unburned gas film with high density and low temperature on the inner wall of the quartz glass tube, which wraps the flame area inside the quartz glass tube and reduces the heat transfer between the flame and the wall. , effectively reduces heat loss, high heat utilization rate, easy to obtain higher temperature, can improve the quality of flame cutting and the output of flame-synthesized nanoparticles.

Description

Rapid mixing tubular flame burner with axial jet

technical field

The invention relates to the field of combustion, in particular to a rapid mixing tubular flame burner with axial jet flow.

Background technique

Since the establishment of China Welding Society and China Welding Association, the two associations have made outstanding contributions to the development of cutting industry, cutting technology and promotion and application. At present, the application of flame cutting in industry has been very common. For the cutting of low-carbon steel plate materials with large thickness (greater than 20mm), flame cutting has the advantages of energy saving, low cost, high cutting quality and high production efficiency. Has been widely used. It is widely used in shipbuilding, automobile and other fields in our country. In addition, flame synthesis of nanomaterials has gradually attracted people's attention. Since hydrocarbon flames can provide high-temperature environments and carbon sources, the required combustion equipment is relatively simple and easy to implement, and has been widely used.

However, there are many problems in the flame cutting technology at the present stage, such as edge defects, cutting section defects, dross, cracks and other problems, which have a great impact on the quality of flame cutting processing, and to a certain extent affect the promotion of flame cutting use. The main reason for these problems is that the temperature of the preheating flame cannot be adjusted flexibly, which will cause great damage to the metal plate surface; the nozzle is easily blocked or even damaged, which affects the flatness of the flame cutting surface; the temperature of the preheating flame is not high enough, resulting in Cracks appear, affecting the processing quality of flame cutting; the surface of the cutting piece is heated unevenly, causing the cutting edge to collapse, etc. In order to improve the quality of flame cutting, higher requirements are put forward for the flame cutting burner, which needs to be able to flexibly adjust the temperature of the preheating flame, improve the service life of the nozzle, reduce slag hanging, and fast heating. At present, the flame synthesis technology of nanomaterials is mostly realized by using a swirling flame to generate a stagnant flame zone (turbulent combustion). On the one hand, the turbulent flame is not easy to finely control, the flame temperature distribution may be uneven, and the particle size of the synthesized nanoparticles is uneven. On the other hand, it is difficult to realize the synthesis of large quantities of nanoparticles with this type of burner. Therefore, it is of great practical significance to design a burner that is safe and reliable, can work for a long time, has high stability, and has a uniform and controllable heating temperature.

The rapid mixing tubular flame burner with axial jet flow of the present invention can better adjust the length of the swirling tubular flame structure. The most critical advantage is that the length of the pure oxygen preheating flame can be extended to ensure automation under rough interfaces The mechanical cutting is carried out smoothly to meet the cutting thickness requirements; at the same time, it can also form a uniform, stable and controllable flame. The flame temperature can be regulated in the range of 1200-2600 degrees Celsius by changing the oxygen flow rate, thus achieving a wider temperature range for nanoparticles. large-scale synthesis techniques. In addition, this kind of flame burner has no backfire danger during operation, is safe and reliable, and in addition to gas combustion, it can also be used for solid and liquid combustion and heating. It has the characteristics of wide fuel sources, simple structure, and low use requirements.

Contents of the invention

The purpose of the present invention is to propose a rapid mixing tubular flame with axial jets to solve the problems of uneven heating of the cut piece, occurrence of dross, cutting surface defects, cracks, and insufficient output of flame-synthesized nanomaterials during the flame cutting process. burner.

A rapid mixing tubular flame burner with an axial jet, the burner includes a burner body and an axial jet device, the burner body has a swirl mixing chamber inside; the burner body also includes at least two along the swirl mixing chamber Tangential to the gas flow inlet communicating with the swirl mixing chamber.

Further, the burner body includes a front cover body, a swirl frame and a rear cover body; the axial jet device includes a nozzle; the nozzle is provided with a through hole; the rear cover body is provided with a through hole; the nozzle is arranged inside the through hole; at least two The two air inlets are arranged on the swirl frame.

Further, at least two grooves are arranged inside the swirl frame, and adjustment blocks corresponding to the number of grooves are arranged inside the grooves, and air inlets are formed between the adjustment blocks and the side walls of the grooves.

Further, the rear cover body and the nozzle are connected by threads.

Further, the adjustment block has a guide arc surface matched with the swirl mixing chamber.

Further, the at least two airflow inlets include a fuel inlet and an oxidant inlet, and the fuel and the oxidant are connected to the adapter connected to the swirl frame through conduits.

Further, the burner also includes a quartz glass tube, and the quartz glass tube is connected to the front cover body through a glass tube fixing sleeve.

Further, the quartz glass tube is concentric with the inner arc surface of the swirl mixing chamber and has the same diameter.

Further, the front cover body, the swirl frame and the rear cover body are connected by fastening bolts.

Further, the adjustment block and the swirl frame are fixed with fastening bolts.

The characteristics of the burner are: 1) Fuel and oxidant are injected into the combustion chamber of the burner from tangential inlets for rapid mixed combustion. These tangential inlets are evenly distributed in the circumferential direction and circumferential axis of the combustion chamber. Under the condition of pure oxygen, it can effectively prevent the occurrence of tempering phenomenon, has good safety and reliability, and can meet the requirements of various temperatures for flame cutting. 2) By adjusting the ratio of oxygen and diluent through the flowmeter, the concentration of oxygen can be flexibly adjusted, thereby changing the temperature of the preheating flame, broadening the field of processing materials for flame cutting, and improving the processing quality of nanomaterials. 3) Utilize the tangential inlets distributed on the circumference of the combustion chamber and the inlets along the axial direction to make the high-speed inflowing gas rotate and advance along the chamber wall and tube wall at high speed. The gas clings to the inner wall of the swirling quartz glass tube, forming a layer of gas film with high density and low temperature, which wraps the flame inside the tube body, restrains the heat conduction between the flame and the wall surface, and effectively reduces Reduce the loss of flame heat, increase the temperature of the preheating flame, the formed tubular flame has good dynamic stability and thermal stability, and form a flame with uniform radial temperature distribution in the inner area of the tube, which can uniformly heat the surface of the workpiece to be cut heating. 4) The non-gas film cuts off the direct contact between the flame and the flame burner wall, reduces the wall temperature of the flame cutting burner, effectively protects the burner, prolongs the service life of the burner, and expands the burner The range of materials obtained. 5) Due to the swirling characteristics of the preheating flame, the ablation and clogging of the nozzle are prevented to a certain extent; the nozzle and the jet device are connected by threads, and the size of the nozzle can be flexibly adjusted according to the demand. 6) The preheating flame rotates and flows in the tube, and the rotating flame flows out at the nozzle to heat the surface of the workpiece; when the swirling flame heats the surface of the heating part, the flame is not easy to extinguish, and it can be blown off to a certain extent The slag generated during flame cutting improves the quality of flame cutting. 7) The burner can add a jet device in the axial direction to form a flame cutting burner, and can also feed precursors in the axial direction, and use the method of flame synthesis to produce nanomaterials. Since the formed flame is a laminar tubular flame, It is easier to control, can improve the quality of nanomaterial processing, and can change the size of the burner according to the output, so as to carry out mass production; in addition, it can also be used for heating metal surfaces, etc., and has a wide range of uses.

Beneficial effect:

1. The fuel and the oxidant of the present invention are injected into the combustion chamber of the burner from the tangential slit inlet uniformly distributed on the circumference and mixed and burned rapidly, which can prevent tempering or even The occurrence of an explosion has inherent safety and reliability.

2. The present invention can flexibly adjust the temperature of the preheating flame by adjusting the oxygen concentration, the temperature range adjusted by the preheating flame is large, and the processed materials for flame cutting are widened.

3. The present invention uses aerodynamic characteristics to form a layer of unburned gas film with high density and low temperature on the inner wall of the quartz glass tube, which wraps the flame area inside the quartz glass tube and reduces the distance between the flame and the wall. Heat transfer effectively reduces heat loss, high heat utilization rate, easy to obtain higher temperature, and can improve the quality of flame cutting.

4. Due to its swirling flow characteristics, the present invention can effectively protect the wall surface of the burner, prevent ablation, and prolong the service life of the burner; at the same time, the swirling flame at the nozzle is not easy to extinguish on the surface of the heating element, the heating effect is good, and it can also blow Remove dross generated during flame cutting, improving the efficiency and quality of flame cutting.

5. The present invention can be used in two different combustion situations of rapid mixing and premixing, both of which can form a safe and stable laminar tubular flame with uniform temperature distribution; due to its good dynamic characteristics and thermal stability, the surface of the cutting material is evenly heated , can improve the quality of flame cutting and reduce the generation of cracks.

6. The present invention can obtain flame cutting slits of different widths by changing the number N2 and size of holes on the nozzle. Due to the swirling characteristics of the preheating flame, the nozzle is protected to a certain extent to prevent the gap from being disturbed and deformed.

7. The present invention can be used not only for flame cutting, but also for heating metal surfaces, and also for flame synthesis of nanometer materials, with a very wide range of applications.

Description of drawings

The accompanying drawings constituting a part of this application are used to provide further understanding of the present invention, and the schematic embodiments and descriptions of the present invention are used to explain the present invention, and do not constitute an improper limitation of the present invention. In the attached picture:

Fig. 1 is the external view of flame cutting burner;

Fig. 2 is a half-sectional view of a flame cutting burner;

Fig. 3 is the exterior view of the swirler of the flame cutting burner;

Description of reference signs: 1. Quartz glass tube; 2. Glass tube fixing sleeve; 3. Front cover body; 4. Copper gasket; 5. Pipe joint; 6. Cyclone; 7. Back cover body; 8. Fixed Bolt; 9. Nozzle; 10. Pipe joint; 11. Copper washer.

Detailed ways

In order to better illustrate the purpose and advantages of the present invention, the specific implementation manners of the present invention will be further described below in conjunction with the drawings.

A rapidly mixing tubular flame burner with axial jet flow, the main components include: quartz glass tube 1, glass tube fixing sleeve 2, copper gasket 11, front cover body 3, copper gasket 4, swirler 6, Back cover body 7, nozzle 9, pipe joint 10, fixing bolt 8 etc. are formed.

The front cover body 3 and the quartz glass tube 1 adopt a transition fit, the copper gasket 10 is inserted into the quartz glass tube 1, and the glass tube fixing sleeve 2 is inserted into the quartz glass tube 1 and the burner front cover body 3 is connected by threads; There are N1 tangential inlet slits inside the device 6, which are tangent to the circular combustion chamber in the middle of the swirler 6, and N1 pipe joints 5 are connected to the outside of the swirler, respectively communicating with the N1 tangential slits; the burner The middle of the back cover body 7 is a threaded through hole, the nozzle 9 and the back cover body 7 are threadedly connected, and the nozzle 9 is distributed with a number of fine holes with a diameter of N2; the front cover body 3, the cyclone 6, and the back cover body 7 are connected together by N3 fixing bolts 8 to form a rapidly mixed flame cutting burner with an axial jet.

When in use, the fuel and the oxidant flow into the gap inlet of the cyclone through the pipe joint 5 respectively, and a swirling mixed gas is formed in the quartz glass tube 1, which is ignited with an igniter at the mouth of the quartz glass tube 1, and the jet gas passes through the pipe joint 10 flows into the through hole of the burner back cover body 7, flows out through the nozzle 9, and forms a jet flow inside the tubular flame. Under the preheating condition of the external tubular flame, the jet flame cuts industrial materials. Precursors can also be directly added in the jet part to achieve flame synthesis of nanoparticles in large quantities.

The above description further elaborates on the purpose, technical solutions and advantages of the present invention. It should be understood that the above description is only a specific implementation process of the present invention, which is used to explain the present invention and is not used to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention. The present invention can also be used in the case of pre-mixed combustion, that is, the fuel and the oxidant are mixed and passed into the burner tangentially. Although it cannot effectively prevent flashback, it can still form a stable and controllable laminar tubular flame with uniform temperature distribution. Prevent ablation phenomenon. Combustion in premixed form adopts the same structure, so it is also within the protection scope of the present invention.

Claims (1)

1. a kind of rapidly mixing tubulose flame burner with axial jet, it is characterised in that：Including quartz glass tube (1), Glass tube fixing sleeve (2), copper washer (11), front cover body (3), copper backing (4), pipe fitting one (5), cyclone (6), rear cover sheet Body (7), fixing bolt (8), nozzle (9), pipe fitting two (10)；

Its connection relation：Front cover body (3) is coordinated with quartz glass tube (1) using transition, and copper washer (11) set, glass tube is solid Fixed set (2) is sequentially sleeved in quartz glass tube (1) outside, glass tube fixing sleeve (2) is rotated clockwise, with screw thread and burner protecgulum Ontology (3) connects, and copper washer (11) is compressed；It can adjust and cut on demand with N1 adjustment block, adjustment block in cyclone (6) To entry gap width, and ensure that the circular hole among tangential inlet gap and cyclone (6) is tangent, connect outside cyclone (6) N1 pipe fitting one (5) is connected to, is communicated respectively with N1 tangential gaps；It is tapped through hole among rear cover of burner ontology (7), spray Mouth (9) using being threadedly coupled, is dispersed with the pore that quantity is a diameter of XX of N2 with rear cover ontology (7) on nozzle (9)；By nozzle (9) after screwing in place, the mode being connected through a screw thread tightens pipe fitting two (10) and rear cover ontology (7)；Front cover body (3), Cyclone (6), rear cover ontology (7) are linked together by N3 fixing bolt (8), and formation combination facilitates, is conveniently replaceable, zero Part is versatile, can be directly used in the industrial tubular flame cutting burner of guidance；

The course of work：Fuel is flowed into the gap of cyclone (6) with oxidant by pipe fitting (5) respectively, in quartz glass tube (1) mixed gas of eddy flow is formed in, is lighted at quartz glass tube (1) nozzle with igniter, Gas Jet flows into burner It in the through-hole of rear cover ontology (7), is flowed out through nozzle, a flame jet is formed inside tubular flame, it is pre- in external tubular flame Under conditions of heat, jet flame cuts industrial materials.