CN103557524B - Swirling premixed regenerative micro-catalytic combustion reactor - Google Patents

Abstract

The invention discloses a swirl premixed regenerative miniature catalytic combustion reactor, which comprises an outer cylindrical body, an upper panel, a porous panel and a U-shaped panel; the upper panel and the U-shaped panel form a cavity with a rectangular cross section , the perforated panel is set at one end of the cavity, and the cavity is set in the outer cylinder; the upper plate is arranged with four upper heat storage cylinders extending vertically downwards into the cavity, and the lower bottom plate of the U-shaped panel is set with six A lower regenerative cylinder that is vertically upward and staggered with the upper regenerative cylinder; the outer cylinder is arranged with two air inlets and two gas inlets along the tangential direction of the circumference, and the center of the left panel An air outlet protruding outward is provided at the place. The present invention combines the outer cylinder, the porous panel and the cavity into an airflow premixing channel, which can avoid direct contact between the high-temperature wall of the combustion chamber and the environment, and reduce heat loss. At the same time, the high-temperature wall of the cavity can preheat the premixed gas, Increase the initial temperature of the premixed gas to reduce the difficulty of gas ignition.

Description

Swirling premixed regenerative micro-catalytic combustion reactor

technical field

The invention relates to a reactor suitable for gas catalytic combustion, in particular to a swirl premixed regenerative miniature catalytic combustion reactor.

Background technique

The utilization of energy generated by fuel combustion is the most widely used energy utilization method in production and life. With the development of science and technology, the application of micro-mechanical systems has been paid more and more attention by scientists. The microscale burners studied so far generally occur in volumes below 1 cm ³ . Microscale burners have the advantages of low cost, longer shelf life, more stable voltage, high energy density and easy refueling. The research on micro-scale burners hopes to solve the problem of long-term stable power supply for portable electronic devices, but in addition to this application, micro-scale combustion has another important application field, that is, the application in future national defense. Micro-aircraft, micro-satellites, and combat soldiers in modern warfare all require high-performance power and electric support. To solve these problems, an energy supply system with small size, light weight, and high energy and power density is urgently needed, but there is no suitable energy supply method at present. Microdynamic energy systems based on microscale combustion, which have high energy density, are currently recognized as one of the most promising approaches to address these issues. But at this stage, micro-scale burners still have the following deficiencies: first, serious heat dissipation; second, insufficient gas premixing; third, due to the small size of the burner, short residence time, and too small reaction area, the reaction cannot fully occur The efficiency is too low; 4. The structure of the reactor is complex and the processing is too difficult.

Contents of the invention

Aiming at the above-mentioned deficiencies in the prior art, the present invention provides a swirl premixed regenerative miniature catalytic combustion reaction which is convenient to connect with the gas source, reduces heat dissipation loss and enables rapid and efficient catalytic combustion reaction of micro-flow gas. device.

In order to solve the problems of the technologies described above, the present invention adopts the following technical solutions:

Swirling flow premixed regenerative miniature catalytic combustion reactor, including an outer cylinder, an upper panel, a porous panel and a U-shaped panel with a U-shaped cross section;

The upper panel is arranged at the top opening of the U-shaped panel, and the upper panel and the U-shaped panel form a cavity with a rectangular cross section. The porous panel is arranged at one end of the cavity, and the aperture of the porous panel extends from all sides to The middle gradually increases; the cavity is set in the outer cylinder body, and the board surfaces of the upper panel and the U-shaped panel are parallel to the axis of the outer cylinder; one end of the outer cylinder is provided with a right side panel, and the other end The left side panel is set, and the porous panel is close to the right side panel and has a gap with the right side panel;

There are four upper regenerative cylinders extending vertically downwards into the cavity on the upper panel, and six upper regenerative cylinders arranged vertically upward and staggered from the upper regenerative cylinders are arranged on the lower bottom plate of the U-shaped panel. The lower regenerative cylinder; the heights of the upper regenerative cylinder and the lower regenerative cylinder are both less than the distance between the upper panel and the lower bottom plate of the U-shaped panel;

The inner walls of the upper panel, the U-shaped panel and the porous panel, and the outer walls of the upper regenerative cylinder and the lower regenerative cylinder are all coated with catalysts; Channels, wherein the two air intake channels symmetrically distributed relative to the outer cylinder are air intakes, and the other two are gas intakes; the air outlet.

As a preferred solution of the present invention, both the upper regenerative cylinder and the lower regenerative cylinder are made of regenerative materials.

Compared with the prior art, the swirl premixed regenerative miniature catalytic combustion reactor of the present invention has the following advantages:

1. Combining the outer cylinder, the porous panel and the cavity to form an airflow premixing channel can avoid direct contact between the high temperature wall of the combustion chamber and the environment, reducing heat loss. At the same time, the high temperature wall of the cavity can preheat the premixed gas. Increasing the initial temperature of the premixed gas can reduce the difficulty of gas ignition.

2. The air intake passage is arranged along the tangential direction of the outer cylinder, and gas and air enter the airflow passage along the tangential direction of the outer cylinder, which can form a swirling airflow, increase the premixing effect, prolong the gas movement path, and increase the The distance between the inlet pipes is improved, and the connection of the pipes is more convenient.

3. The aperture of the porous panel at one end of the cavity gradually increases from the surrounding to the middle, which can reduce the unevenness of gas distribution in the combustion chamber.

4. The inner walls of the cavity and porous panels, as well as the outer walls of the upper and lower regenerative cylinders are coated with catalysts to improve combustion stability and efficiency.

5. The upper regenerative cylinder and the lower regenerative cylinder adopt regenerative materials, which can effectively store part of the heat released when the combustion reaction is intense, and avoid high temperature deactivation of the catalyst due to the high temperature of the inner wall of the cavity; When the internal temperature decreases, the combustion can be improved by releasing the stored heat, which plays a role in stabilizing combustion and intensifying combustion, so that the combustion efficiency can be improved.

6. The existence of the outer cylinder increases the surface area of the catalytic wall. At the same time, the outer cylinder also plays the role of blunt body disturbance, which prolongs the reaction time and enhances the mixing effect of air and gas, improves the reaction efficiency, and is beneficial to reduce The size of the small micro burner.

Description of drawings

Fig. 1 is the top view of swirl premixed regenerative miniature catalytic combustion reactor;

Fig. 2 is the sectional view of swirl premixed regenerative miniature catalytic combustion reactor along A-A direction;

Fig. 3 is the cross-sectional view of the swirl premixed regenerative miniature catalytic combustion reactor along the B-B direction;

Fig. 4 is a left view of the swirl premixed regenerative miniature catalytic combustion reactor.

In the accompanying drawings: 1—outer cylinder; 2—upper panel; 3—U-shaped panel; 4—porous panel; 5—upper regenerative cylinder; 6—bottom regenerative cylinder; 7—left panel; 81 - air inlet; 82 - gas inlet; 9 - gas outlet.

Detailed ways

The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

As shown in Figures 1, 2, 3, and 4, the swirl premixed regenerative micro catalytic combustion reactor includes an outer cylinder 1, an upper panel 2, a porous panel 4 and a U-shaped panel 3 with a U-shaped cross section. .

The upper panel 2 is set at the top opening of the U-shaped panel 3. The upper panel 2 and the U-shaped panel 3 form a cavity with a rectangular cross section. Flow resistance, the porous panel 4 is set at one end of the cavity, there are many circular holes of different sizes on the porous panel 4, the aperture of the porous panel 4 gradually increases from the surrounding to the middle, and the change of the aperture can effectively adjust the gas density in different parts of the combustion chamber The inhomogeneity reduces the adverse effect on combustion caused by the uneven gas flow rate. The cavity is arranged in the outer cylinder 1 , and the upper panel 2 and the U-shaped panel 3 are parallel to the axis of the outer cylinder 1 . One end of the outer cylindrical body 1 is provided with a right side panel, and the other end is provided with a left side panel 7, and the perforated panel 4 is close to the right side panel with a gap therebetween.

On the upper panel 2 are arranged four upper heat storage cylinders 5 extending vertically downwards into the cavity, and on the lower bottom plate of the U-shaped panel 3 are arranged six vertically upward and staggered arrangements with the upper heat storage cylinders 5 The size and material of the lower regenerative cylinder 6, the four upper regenerative cylinders 5 and the six lower regenerative cylinders 6 are exactly the same. The heights of the upper heat storage cylinder 5 and the lower heat storage cylinder 6 are both smaller than the distance between the upper panel 2 and the lower bottom plate of the U-shaped panel 3 . Both the upper regenerative cylinder 5 and the lower regenerative cylinder 6 are made of regenerative materials. The upper regenerative cylinder 5 and the lower regenerative cylinder 6 can not only increase the disturbance of the mixed gas and prolong the residence time, but also the stored heat can release part of the heat when the combustion temperature is low, improving the stable combustion effect.

The inner walls of the upper panel 2, the U-shaped panel 3 and the porous panel 4, and the outer walls of the upper regenerative cylinder 5 and the lower regenerative cylinder 6 are all coated with catalyst. The outer cylindrical body 1 is arranged with four air intake passages along the tangential direction of the circumference, of which the two air intake passages distributed symmetrically relative to the outer cylindrical body 1 are air inlets 81, and the other two are gas inlets 82, This kind of air inlet is conveniently connected to the air source, effectively solving and simplifying the problem of difficult connection between the air inlet and the air source. An air outlet 9 protruding outward and communicating with the cavity is provided at the center of the left side panel 7 .

A swirling gas premixing channel is formed between the outer cylinder 1 and the cavity, so that the incoming gas swirls along the gas channel, effectively prolonging the gas flow path and increasing the premixing time. At the same time, the high temperature wall surface of the cavity can be used for premixing The mixed gas is preheated to increase the initial temperature of the premixed gas combustion and reduce the difficulty of ignition; the combustion chamber is formed between the upper panel 2 and the U-shaped panel 3 of the cavity, and the upper regenerative cylinder 5 and the lower regenerative cylinder 6 The combustion surface area is increased, and the gas mixing disturbance is strengthened, which helps to enhance the stability of the flame in the micro-scale burner and improve the combustion efficiency.

When using the swirl premixed regenerative miniature catalytic combustion reactor, at first the air inlet 81 and the gas inlet 82 of the outer cylindrical body 1 are respectively connected to the corresponding gas source, and the gas forms a rotating preheating in the air flow channel. At the same time, the mixed air flow can absorb heat through the high-temperature wall of the cavity to increase the initial temperature of the combustion gas, and then the preheated mixed gas enters the combustion chamber through the porous panel 4, and passes through the upper regenerative cylinder 5 and the lower regenerative cylinder 6 Under the action of mixing disturbance and catalyst, a catalytic combustion reaction occurs, and the gas generated by the reaction is discharged from the gas outlet 9 .

Finally, it is noted that the above embodiments are only used to illustrate the technical solutions of the present invention without limitation. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be carried out Modifications or equivalent replacements without departing from the spirit and scope of the technical solution of the present invention shall be covered by the claims of the present invention.

Claims (2)

1. Swirling flow premixed regenerative miniature catalytic combustion reactor, characterized in that it includes an outer cylinder (1), an upper panel (2), a porous panel (4) and a U-shaped panel with a U-shaped cross section ( 3); The upper panel (2) is set at the top opening of the U-shaped panel (3), the upper panel (2) and the U-shaped panel (3) form a cavity with a rectangular cross section, and the porous panel (4) is set At one end of the cavity, the aperture of the porous panel (4) gradually increases from the periphery to the middle; the cavity is set in the outer cylinder (1), and the upper panel (2) and the U-shaped panel (3 ) is parallel to the axis of the outer cylinder (1); one end of the outer cylinder (1) is provided with a right panel, and the other end is provided with a left panel (7), and the porous panel (4) is close to There is a gap between the right panel and the right panel; The upper panel (2) is arranged with four upper heat storage cylinders (5) extending vertically downwards into the cavity, and the lower bottom plate of the U-shaped panel (3) is provided with six vertically upward and The lower regenerative cylinder (6) arranged in a staggered manner with the upper regenerative cylinder (5); the heights of the upper regenerative cylinder (5) and the lower regenerative cylinder (6) are both smaller than the upper panel (2) and The distance between the lower bottom plates of the U-shaped panels (3); The inner walls of the upper panel (2), the U-shaped panel (3) and the porous panel (4), and the outer walls of the upper regenerative cylinder (5) and the lower regenerative cylinder (6) are all coated with a catalyst; the The outer cylindrical body (1) is arranged with four air intake passages along the tangential direction of the circumference, of which the two air intake passages distributed symmetrically relative to the outer cylindrical body (1) are air inlets (81), and the other two are air inlets (81). A gas inlet (82); a gas outlet (9) protruding outward and communicating with the cavity is provided at the center of the left side panel (7). 2. The swirl premixed regenerative micro catalytic combustion reactor according to claim 1, characterized in that: the upper regenerative cylinder (5) and the lower regenerative cylinder (6) are both composed of regenerative material.