The liquid-fuel burner

 

The invention can be used to heat gases in various industrial installations, such as drying agent in the agricultural grain dryers. The liquid-fuel burner contains a fan, a combustion chamber for the gasification and combustion, toplevelbase device installed in the front part of the combustion chamber connected to the fan casing that encloses the combustion chamber and forming around it an annular space for the passage of air in the combustion chamber is made side Windows for air flow from the annular space, respectively, in the gasification zone and a combustion zone, the combustion chamber has a section of the gasification and combustion section, and the gasification section is made in the form of the cone, covering the cone of the spray of fuel, and the combustion section as connected in series confuser and cone, in place of the coupling sections provided by the annular gap for the passage of air. In the end part of the gasification section with holes for the passage of air. In the diffuser section of the combustion installed swirl. Swirl has a Central hole. The side Windows to supply air to the zone of combustion is made for satirical the PRA section of the combustion covers and overlaps in the axial direction of the outlet section of the diffuser section of the gasification. The output part of the diffuser section of the gasification and the input part of the confuser section of the combustion cylindrical bands, and the annular gap for the passage of air is formed by a gap between these bands. The invention allows to improve the mixing of fuel with air, to reduce the likelihood of local hypothermia of the torch and nabryzgivanii fuel on the walls of the combustion chamber, which increases the combustion efficiency and reliability of operation of the burner. 7 C.p. f-crystals, 2 Il.

The invention relates to heat engineering and can be used mainly for heating gases in various industrial installations, such as drying agent in the agricultural grain dryers.

Known liquid-fuel burner in the gas heater.with. The USSR №1825070, CL F 24 N 3/02, F 26 23/02 from 1991). It contains a fan, a combustion chamber (heating pipe), toplevelbase device in the form of air nozzle installed in the front part of the combustion chamber connected to the fan casing that encloses the combustion chamber and forming an annular space for the passage of air. In the combustion chamber is made of a side window for submission to the air of the above-mentioned annular space.

Lack of turbulization of the flow of air-fuel mixture forced to perform a combustion chamber of relatively large size.

The prototype declared burner is a burner of a heat generator of the mixture of flue gases with air.with. The USSR # 213690, CL F 26 40/60 from 1968). Burner-the prototype includes a fan, a combustion chamber for the gasification and combustion, toplevelbase device installed in the front part of the combustion chamber connected to the fan casing that encloses the combustion chamber and forming around it an annular space for the passage of air. In the combustion chamber are tangentially directed side Windows for air flow from the annular space, respectively, in the gasification zone and a combustion zone.

Burner-the prototype is relatively compact, but it also does not provide sufficient completeness of combustion and on the walls of the combustion chamber is formed Nagar due nabryzgivaniya fuel. This methods of payment when drops of fuel to fly under the action of centrifugal forces.

In addition, the filing of all of the air required for the gasification and combustion, only through the side window of the combustion chamber leads to local hypothermia of the torch in the area of these Windows, which affects the combustion and also contributes to the formation, reducing the reliability of operation of the burner.

The objective of the invention is the improvement of combustion efficiency and reliability of operation of the burner by improving the mixing of fuel with air, reducing the likelihood of local hypothermia of the torch and nabryzgivaniya fuel on the walls of the combustion chamber.

This problem is solved by the fact that the proposed burner, like its prototype, includes a fan, a combustion chamber for the gasification and combustion, toplevelbase device installed in the front part of the combustion chamber connected to the fan casing that encloses the combustion chamber and forming around it an annular space for the passage of air. In the combustion chamber is made side Windows for air flow from the annular space, respectively, in the gasification zone and a combustion zone. However, unlike the prototype, its combustion chamber has a section gazifikacia, and the combustion section as connected in series confuser and diffuser. In place of the coupling sections provided by the annular gap for the passage of air.

The presence in the combustion chamber of the two sections specified form creates a variable throttle cross section, providing the speed and turbulence of the gas flow, which improves the mixing of fuel with air. It does not use the rotational movement of the gas stream, as in the similar and the prototype, i.e. particles of fuel is not centrifugal force, which significantly reduces the likelihood of fuel on the walls of the combustion chamber and the formation of soot on them.

A circular slot provided in place of the coupling section of the gasification and combustion section, together with the confuser last provide smooth, distributed in space adulteration needed for combustion air in the gasified fuel-air mixture that does not cause local hypothermia of the torch. This forms the moving air layer (air layer) along the wall confuser that prevents nabryzgivanii fuel on it.

So, the above new set of common essential features, in the exercise of zapchasti cases implementing the inventive burner, in the end part of the gasification section with holes for the passage of air.

In addition, the diffuser section of the combustion installed swirl. It increases the speed of air-fuel mixture and creates for him an area of reverse currents.

In addition, the swirl has a Central opening through which a portion of the air-fuel mixture fed into the zone of reverse currents for the swirl. This promotes better mixing of the fuel-air mixture.

In addition, the side Windows to supply air to the zone of combustion is made for the swirl. Thanks to the air incoming through the mentioned side Windows, heated and mixed in the area of reverse currents for the swirl.

In addition, the combustion section covered by a protective screen attached to its confuser and diffuser. On the one hand, keeps a constant cross-section of the annular channel, and on the other, protects the walls of the combustion section from the cooling air passing through this channel. As a result, the part of heat by conduction is transferred from the warmer end of the plot section of the combustion to the less-heated primary. This increases the temperature of the initial portion of the combustion section, which leads to greater evaporation of fuels which opens in the axial direction of the outlet section of the diffuser section of the gasification. This ensures efficient direction of the air flow entering through the annular gap into the combustion chamber.

In addition, the output portion of the diffuser section of the gasification and the input part of the confuser section of the combustion cylindrical bands, and the annular gap for the passage of air is formed by a gap between these bands. Cylindrical bands enhance the above effect and increase the stiffness of the mating edges of the sections of the combustion chamber.

Considered private significant features enhance the technical result specified in the invention.

The essence of the invention is illustrated by drawings.

In Fig.1 shows a liquid-fuel burner, a General view of the local section, as shown in Fig.2.

The liquid-fuel burner (Fig.1, 2) contains the fan 1, the fuel system 2, toplevelbase device 3, the spark plug 4, the casing 5 within which is installed in the combustion chamber 6. The combustion chamber 6 consists of a gasification section, made in the form of the diffuser 7, and the combustion section, made from connected together confuser 8 and 9 diffuser. In place of the coupling sections has a circular slot 10 width S made, in particular, between the cylindrical Spigots provided on the edges of secla the passage of air.

In the diffuser 9 is installed swirl 14 having a center hole 15. For entry of air into the burning zone of the diffuser 9 has a lateral window 16. The confuser 8 and the cone 9 is covered by a protective screen 17.

The liquid-fuel burner works as follows (Fig.1, 2).

Fan 1 creates air flow Q, while in the fuel system 2 is pressurized and the liquid fuel rasplivaetsa toplivozapravschik device 3 at an angle. Sprayed fuel is ignited by a spark plug 4. In the direction of the air flow Q is divided into multiple threads. Flow Q1 passing through the hole 11, is mixed with the sprayed fuel and creates the initial conditions for combustion. For the hole 11, the flow Q1 forms a turbulence, resulting in possible nabryzgivanii fuel on the walls of the diffuser 7. The flow Q2 supplied through holes 12, removes the zone of turbulence from the end wall, thereby preventing nabryzgivanii fuel on it. Also it is mixed with the burning fuel and sustain combustion.

As the promotion of fuel-air mixture along the diffuser 7 the velocity is reduced, which contributes to the mixing and increases the residence time of the mixture in the gasification section.

In Rasa nabryzgivanii fuel on it. At the same time it is mixed with the air-fuel mixture, maintaining the combustion.

In the area of gasification, the fuel burns incompletely, the amount of air flows Q1, Q2, Q3, create an air excess factor<1.

Further, during the movement of the air-fuel mixture at the outlet of the diffuser 7 is added to the air flow Q4 directed at an angle to the direction of movement of the latter. Air flow Q4 prevents nabryzgivanii fuel on the walls of the confuser 8, at the same time it is intensively mixed with the air-fuel mixture, which, falling into the confuser 8, increases its speed, this also contributes to the flow direction at an angle to the movement of the gas mixture.

The fuel-air mixture entering the diffuser 9, first, reduce your speed, and then increases, falling into the installation area of the swirler 14. At the end of the last speed maximum air-fuel mixture. Significant changes of speed and direction of movement of the air-fuel mixture contributes to its intensive mixing and, therefore, the best preparation for burning.

Sebastopoli through the side window 16, located behind the swirler 14, quickly heated and mixed with the air-fuel mixture. This also contributes to the flow of air-fuel mixture flowing through the opening 15 in the swirler 14. The air flow Q5 increases the excess air coefficient>1, intensive mixing of the preheated gas mixture with air ensures efficient combustion.

The cover 17 covering the confuser 8 and 9 diffuser, can change the temperature along the walls of the combustion section. Due to the heat of the walls of the diffuser 9 of the heat is transferred from the warmer end of the site to a less heated primary. This increases the temperature of the initial section of the cone 9 and the end confuser 8, which contributes to better fuel vaporization.

In addition, the installation of the casing 17 can reduce the loss of air pressure during its movement from the fan 1 to the side Windows 16 located behind the swirler 14.

The above data confirm the possibility of increasing combustion efficiency and reliability of operation of the burner by better mixing of fuel with air and the reduction of carbon formation on the walls of the combustion chamber by reducing narashinodai for heating the drying agent in grain dryers. The burner works well on diesel fuel, tested and recommended for use burners on crude oil.

Claims

1. The liquid-fuel burner, comprising a fan, a combustion chamber for the gasification and combustion, toplevelbase device installed in the front part of the combustion chamber connected to the fan casing that encloses the combustion chamber and forming around it an annular space for the passage of air in the combustion chamber is made side Windows for air flow from the annular space, respectively, in the gasification zone and a combustion zone, wherein the combustion chamber has a section of the gasification and combustion section, and the gasification section is made in the form of the cone, covering the cone of the spray of fuel, and the combustion section as connected in series confuser and cone, in place of the coupling sections provided by the annular gap for the passage of air.

2. Burner under item 1, characterized in that the end part of the gasification section with holes for the passage of air.

3. Burner under item 1 or 2, characterized in that the diffuser section of the burning of the mouth of the Burner under item 3 or 4, characterized in that the side Windows to supply air to the zone of combustion is made for the swirl.

6. Burner under item 1 or 2 or 3 or 4 or 5, characterized in that section of the combustion covered by a protective screen attached to its confuser and diffuser.

7. Burner under item 1 or 2 or 3 or 4 or 5 or 6, characterized in that the input part of the confuser section of the combustion covers and overlaps in the axial direction of the outlet section of the diffuser section of the gasification.

8. Burner under item 1 or 2 or 3 or 4 or 5 or 6 or 7, characterized in that the output part of the diffuser section of the gasification and the input part of the confuser section of the combustion cylindrical bands, and the annular gap for the passage of air is formed by a gap between these bands.

 

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