CN114660228A - Fuel droplet combustion system with adjustable combustion intensity - Google Patents

Abstract

Provided is a fuel droplet combustion system with adjustable combustion intensity, which belongs to the basic research field of fuel droplet combustion, the core of which is the configuration of mixture fuel and the adjustment of combustion intensity, which is used for scientific research on combustion characteristics during dynamic changes of fuel oil. . The system adopts the partial pressure method to store propane, oxygen and air in the gas storage tank. The gas storage tank is used as the supply source of combustible gas mixture. The gas distribution follows the principle of complete combustion of propane and oxygen. Air is used as the combustion environment. Oxygen proportions of air form combustion environments with different oxygen proportions of air. The combustible mixture supplied by the gas storage tank to the burner adjusts the flow through the throttling and speed regulation of the needle valve, and is finally delivered to the burner through the gas path, and flows out from the porous medium plate of the burner. Homogeneous stable flame.

Description

Fuel droplet combustion system with adjustable combustion intensity

technical field

The invention belongs to the technical field of fuel droplet combustion research, in particular to a fuel droplet combustion system with adjustable combustion intensity.

Background technique

As an industrial fuel, fuel oil plays an important role in human industrial production and life. The use of fuel oil is very wide, such as the conversion of thermal energy and mechanical energy in engines to provide power, the heating furnace in the iron and steel industry, and the oil-fired power generation in the power industry. Depending on the application, the type of fuel used is also different. Whether fuel combustion is used as power or heat source, its thermal efficiency is not 100%, there is energy loss, and incomplete combustion will also generate pollutants. Therefore, scientists have been working on the development and utilization of fuel, aiming to improve combustion efficiency and reduce pollutant emissions.

Human research on combustion has continued for hundreds of years, and its mechanism has not yet been explored. In the past research on fuel combustion, advanced testing methods were used, from analyzing its chemical composition and physical properties to analyzing its luminescence and heating characteristics during combustion, so as to complete the whole process of fuel quality research. However, there are few studies focusing on the combustion of fuel droplets during the dripping process, because this process is a combination of kinetic and combustion processes, which is more complicated than a simple combustion process. Combustion mechanism, thus enriching the research on fuel quality. Therefore, it is necessary to design an experimental system that can realize the combustion of oil droplets during dynamic dripping.

SUMMARY OF THE INVENTION

The technical problem solved by the present invention is to provide a fuel oil droplet combustion system with adjustable combustion intensity. The present invention is suitable for the study of the dynamic combustion characteristics of fuel oil, and adopts high-speed optical testing means. Combustion information such as ignition delay time, brightness and flame color, to study the combustion characteristics of fuel oil in the dynamic development process under specific physical characteristics, and then evaluate the quality of fuel oil.

The technical scheme adopted in the present invention: a fuel droplet combustion system with adjustable combustion intensity, including a gas distribution system, a flow adjustment system, a burner, and a cooling system, and the gas distribution system includes a propane gas supply cylinder, an oxygen gas supply cylinder, an air A gas supply cylinder and a gas storage tank, a gas storage tank shut-off valve is arranged at the mouth of the gas storage tank, and the propane gas supply bottle mouth passes through the propane gas cylinder shut-off valve, the propane gas supply pressure reducing valve and the gas storage tank in turn. The air supply cylinder is connected to the stop valve of the gas storage tank, the oxygen supply cylinder is connected to the stop valve of the gas storage tank through the oxygen cylinder stop valve and the oxygen supply pressure reducing valve in turn, and the air supply cylinder is cut off through the air cylinder in turn. The valve and the air supply pressure reducing valve are connected with the gas storage tank shut-off valve of the gas storage tank;

The flow regulation system includes an air supply pressure reducing valve and a needle valve of an air storage tank, and the air storage tank shut-off valve of the air storage tank is sequentially connected to the air inlet interface of the burner through the air supply pressure reducing valve and the needle valve of the air storage tank. , the cooling system is connected with the water inlet interface and the return water interface of the burner for circulating cooling when the burner is working;

The gas distribution system completes the gas distribution operation of the combustible mixture by storing propane, oxygen and air in the gas storage tank according to the pressure from low to high by sequentially switching the shut-off valve and the air supply pressure reducing valve. The flow regulation system is used for stepless flow regulation of the combustible gas mixture delivered to the burner from the gas storage tank. The combustible gas mixture entering the burner is ignited to form a homogeneous and stable flame, and the fuel droplets falling from the central pipe are The oil droplet combustion process is completed near the flame;

A further limitation to the above technical solution, the propane gas supply cylinder bottle mouth is connected to a propane gas cylinder cut-off valve, the propane gas cylinder cut-off valve is connected to a propane gas supply pressure reducing valve through a hose, and the propane gas supply pressure reducing valve is connected. It is connected with the stop valve of the gas storage tank through a hose, the mouth of the oxygen supply cylinder is connected with the stop valve of the oxygen cylinder, and the stop valve of the oxygen cylinder is connected with the oxygen supply pressure reducing valve through a hose, and the oxygen supply pressure is reduced. The valve is connected to the shut-off valve of the air storage tank through a hose, the mouth of the air supply bottle is connected to the shut-off valve of the air bottle, and the shut-off valve of the air bottle is connected to the air supply pressure reducing valve through a flexible tube, and the air supply pressure reduction valve is connected. The pressure valve is connected to the shut-off valve of the air storage tank through a hose, the shut-off valve of the air storage tank is connected to the air supply pressure reducing valve of the air storage tank through a hose, and the air supply pressure reducing valve of the air storage tank is connected to the needle valve through a hose connect.

To further limit the above technical solution, the burner includes a burner cavity, the burner cavity is divided into a liquid-passing cavity and a ventilation cavity, the cooling system includes an electric pump and a water tank, and the end cover will pass the liquid. The cavity is sealed, the water inlet port is set at the water inlet end of the liquid passage cavity, the return water port is set at the return water end of the liquid passage chamber, and the water inlet port is connected with the electric pump, which pumps from the water tank The cooling water is sucked, and the water return interface flows the cooling water back to the water tank. The porous medium plate is pressed and fixed by the gland and the pressing bolt in the ventilation cavity, and the center pipe is sealed from the middle of the ventilation cavity and the liquid passage cavity. , the air inlet interface is arranged at the air inlet end of the ventilation cavity.

The advantages of the present invention compared with the prior art:

1. This scheme is a fuel droplet combustion system that can realize adjustable combustion intensity. The system is used for combustion research in the dynamic process of fuel droplet dripping, and provides technical support for fuel quality research;

2. This scheme can realize the adjustment of the combustion intensity. Through the throttling and speed regulation of the needle valve, the flow rate of the mixed fuel passing through the porous media plate of the burner can be adjusted, so as to achieve the effect of adjusting the combustion intensity;

3. This scheme can create a combustion environment with air with different oxygen ratios. Three kinds of fuel mixtures of propane, oxygen and air are arranged in the gas storage tank by the partial pressure method. The partial pressure method ensures the complete combustion of propane and oxygen, so it can be configured The different ratios of oxygen in the air to form the combustion environment of different oxygen ratios when propane is burned, such as oxygen-lean and oxygen-rich air environments, provide technical support for the analysis of fuel combustion in air environments with different oxygen ratios.

Description of drawings

FIG. 1 is a schematic diagram of the overall system principle of the present invention.

Fig. 2 is a working schematic diagram of the burner in the present invention during combustion.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

It should be noted that, herein, the terms "comprising", "comprising" or any other variation thereof are intended to encompass non-exclusive inclusion, such that a process, method, article or device comprising a series of elements includes not only those elements, It also includes other elements not expressly listed or inherent to such a process, method, article or apparatus. without more restrictions. An element qualified by the phrase "comprising a..." does not preclude the presence of additional identical elements in a process, method, article or apparatus that includes the element.

Please refer to FIGS. 1-2 for a detailed description of an embodiment of the present invention.

Fuel droplet combustion system with adjustable combustion intensity, including gas distribution system, flow adjustment system, burner, and cooling system.

The gas distribution system includes a propane gas supply cylinder 1, an oxygen gas supply cylinder 2, an air gas supply cylinder 3, and a gas storage tank 11. The gas storage tank 11 is provided with a gas storage tank cut-off valve 10 at the bottle mouth. The bottle mouth of the gas supply cylinder 1 is connected to the gas storage tank stop valve 10 of the gas storage tank 11 through the propane gas cylinder cut-off valve 4 and the propane gas supply pressure reducing valve 9 in turn, and the oxygen gas supply cylinder 2 passes through the oxygen cylinder cut-off valve 5 in turn. And the oxygen supply gas pressure reducing valve 8 is connected with the gas storage tank cut-off valve 10 of the gas storage tank 11, and the air supply cylinder 3 is connected to the gas storage tank 11 through the air cylinder cut-off valve 6 and the air supply pressure reducing valve 7 in turn. The gas tank shut-off valve 10 is connected. Specifically, the mouth of the propane gas supply cylinder 1 is connected to a propane gas cylinder cut-off valve 4, and the propane gas cylinder cut-off valve 4 is connected to a propane gas supply pressure reducing valve 9 through a hose, and the propane gas supply pressure reducing valve 9 It is connected with the gas storage tank cut-off valve 10 through a hose, the oxygen cylinder cut-off valve 5 is connected to the bottle mouth of the oxygen gas supply cylinder 2, and the oxygen cylinder cut-off valve 5 is connected with the oxygen supply gas pressure reducing valve 8 through a hose. The oxygen supply air pressure reducing valve 8 is connected with the gas storage tank cut-off valve 10 through a hose, the air supply cylinder 3 is connected to the air cylinder cut-off valve 6, and the air cylinder cut-off valve 6 is connected with the air supply air reduction valve 6 through a hose. The pressure valve 7 is connected, and the air supply and air pressure reducing valve 7 is connected with the shut-off valve 10 of the air storage tank through a hose. In the above, three gas cylinders store three kinds of high-pressure gases respectively, three gas cylinder shut-off valves are used as switches for the three gas cylinders, and three pressure reducing valves are used to set the pressure of the three kinds of gases during gas distribution by the partial pressure method. The tank stores the combustible mixed gas configured by the partial pressure method, and the shut-off valve of the gas tank is used as the switch of the gas tank.

The gas distribution system adopts the partial pressure method to complete the gas distribution operation. When distributing gas, it passes through the propane cylinder cut-off valve 4, the oxygen cylinder cut-off valve 5, the air cylinder cut-off valve 6, the air supply pressure reducing valve 7, the oxygen supply pressure reducing valve 8, the propane gas supply pressure reducing valve 9, and the gas storage tank. The sequential operations of the shut-off valve 10, according to the pressure from low to high, respectively store propane, oxygen and air in the gas storage tank 11 to complete the configuration operation of the combustible mixture.

The flow regulation system includes a gas tank supply pressure reducing valve 12 and a needle valve 13, and the gas tank shut-off valve 10 of the gas tank 11 is connected to the burner through the gas tank supply pressure reducing valve 12 and the needle valve 13 in turn. The intake port 22 is connected. Specifically, the gas storage tank shut-off valve 10 is connected to the gas storage tank gas supply pressure reducing valve 12 through a hose, and the gas storage tank gas supply pressure reducing valve 12 is connected to the needle valve 13 through a hose.

The flow adjustment system can perform stepless flow adjustment of the combustible mixture delivered from the gas storage tank 11 to the burner. The air supply pressure reducing valve 12 of the air storage tank performs a depressurization operation on the combustible mixed gas output from the air storage tank 11, and the flow of the combustible mixed gas is steplessly adjusted by adjusting the opening size of the needle valve 13. When the pressure of the combustible gas mixture in the air storage tank 11 is lower than the pressure value set by the air supply pressure reducing valve 12 of the air storage tank, it is necessary to use the partial pressure method to re-distribute the gas.

The burner includes a burner cavity 16, the burner cavity 16 is divided into a liquid-passing cavity 17 and a ventilation cavity 18, the cooling system includes an electric pump 15 and a water tank 14, and the end cover 21 connects the liquid-passing cavity. 17. Cover, the water inlet port 19 is set at the water inlet end of the liquid passage 17, the return water port 20 is set at the water return end of the liquid passage chamber 17, the water inlet port 19 is connected to the electric pump 15, the The electric pump 15 sucks the cooling water from the water tank 14, the water of the water return port 20 flows back to the water tank 14, and the porous medium plate 25 is pressed and fixed in the ventilation cavity 18 by the gland 23 and the pressing bolt 24. 25 The combustible gas mixture flows out through the tiny holes all over it. The central pipe 26 is sealed through the middle of the ventilation cavity 18 and the liquid passage 17. The central pipe 26 is used to pass the dripping fuel droplets. The central pipe 26 and the end cover 21 are welded to the burner cavity 16 to ensure the liquid passage. 17 and the seal of the vent chamber 18. The air inlet port 22 is provided at the air inlet end of the ventilation cavity 18 .

The burner is the carrier that finally burns. The combustible gas mixture entering the burner ventilation cavity 18 flows out through the porous media plate 25, and forms a homogeneous and stable flame after being ignited. During the fuel droplet burning experiment, the oil droplets pass through the central pipe 26 after the droplets drop, and the oil droplets burn below near the flame.

The cooling system is connected with the water inlet port 19 and the return water port 20 of the burner, and the cooling system provides a steady stream of circulating cooling water for the liquid passage 17 of the burner cavity 16, which is used for circulating cooling when the burner is working. . The cooling system performs circulating cooling when the burner is working. The electric pump 15 sucks the cooling water from the water tank 14 and sends it to the liquid passing chamber 17 of the burner, and then the cooling water flows back to the water tank, and the cycle is repeated to complete the cyclic cooling of the burner.

working principle:

The gas distribution system adopts the partial pressure method to configure the combustible mixture, and all shut-off valves are closed before the gas distribution. First, configure the propane, open the propane gas cylinder shut-off valve 4, adjust the propane gas supply pressure reducing valve 9 to the required pressure value, open the gas storage tank shut-off valve 10, and let the propane in the propane gas supply cylinder 1 enter the gas storage tank 11. , when the inflation pressure is stable, close the gas storage tank shut-off valve 10 and the propane gas cylinder shut-off valve 4, and the propane configuration is completed. Secondly, according to the principle of complete combustion of propane and oxygen, oxygen higher than the pressure of propane is arranged, the oxygen cylinder shut-off valve 5 is opened, the oxygen supply gas pressure reducing valve 8 is adjusted to the required pressure value, and the gas storage tank shut-off valve 10 is opened to allow oxygen supply. The oxygen in the bottle 2 enters the gas storage tank 11, and after the inflation pressure is stabilized, the gas storage tank cut-off valve 10 and the oxygen cylinder cut-off valve 5 are closed, and the oxygen configuration is completed. Finally, configure the air with the highest pressure, open the air bottle shut-off valve 6, adjust the air supply pressure reducing valve 7 to the required pressure value, and open the air storage tank shut-off valve 10 to allow the air in the air supply cylinder 3 to enter the air storage tank 11. , after the inflation pressure is stable, close the shut-off valve 10 of the air storage tank and the shut-off valve 6 of the air bottle, and the air configuration is completed.

The combustible gas mixture delivered to the burner by the gas storage tank 11 needs to go through a flow regulating system. First close the needle valve 13, then open the gas storage tank shut-off valve 10, adjust the gas supply pressure reducing valve 12 of the gas storage tank to reduce the supply pressure, and finally open the needle valve 13 to adjust the flow rate of the combustible mixture supplied to the burner to adjust the combustion intensity. When the pressure of the combustible mixed gas in the air storage tank 11 is lower than the set value of the air supply pressure reducing valve 12 of the air storage tank, it is necessary to re-use the partial pressure method to configure the combustible mixed gas.

The burner is the carrier for the final combustion, the inlet port 22 is connected to the combustible mixture, the water inlet port 19 is connected to the cooling water inlet, and the return water port 20 is connected to the cooling return water. The combustible gas mixture flowing into the ventilation cavity 18 flows out from the porous medium plate 25, and after ignition, a stable flame with an adjustable average combustion intensity is formed. During the experiment, the dripping fuel droplets pass through the central pipe 26, and combustion occurs near the flame. .

In order to keep the temperature of the burner from being too high, a cooling system is used to cool the burner in a cycle. The cooling medium is water, and the electric pump 15 sucks the cooling water from the water tank 14, sends it to the liquid passage 17 of the burner through the water inlet port 19, and then flows back to the water tank 14 through the return water port 20 to complete the circulating cooling.

The invention adopts the partial pressure method to store propane, oxygen and air in the gas storage tank, the gas storage tank is used as the gas supply source of the combustible gas mixture, the gas distribution follows the principle of complete combustion of propane and oxygen, and the air is used as the combustion environment. The air with different oxygen ratios forms a combustion environment with different oxygen ratios; the combustible gas mixture supplied to the burner by the gas storage tank adjusts the flow rate through the throttling and speed regulation of the needle valve, and is finally delivered to the burner through the gas path, from the porous medium of the burner. The plate flows out and is ignited to form a homogeneous and stable flame with steplessly adjustable combustion intensity, which is used for scientific research on the combustion characteristics during the dynamic change of fuel. The present invention adopts high-speed optical testing means to study the combustion characteristics of the fuel oil in the dynamic development process under specific physical characteristics by observing the combustion information such as the ignition delay period, brightness and flame color during combustion during the dynamic dripping process of the fuel oil droplets, and then Evaluate the quality of fuel.

It will be apparent to those skilled in the art that the present invention is not limited to the details of the above-described exemplary embodiments, but that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments are to be regarded in all respects as illustrative and not restrictive, and the scope of the invention is to be defined by the appended claims rather than the foregoing description, which are therefore intended to fall within the scope of the claims. All changes within the meaning and scope of the equivalents of , are included in the present invention. Any reference signs in the claims shall not be construed as limiting the involved claim.

In addition, it should be understood that although this specification is described in terms of embodiments, not each embodiment only includes an independent technical solution, and this description in the specification is only for the sake of clarity, and those skilled in the art should take the specification as a whole , the technical solutions in each embodiment can also be appropriately combined to form other implementations that can be understood by those skilled in the art.

Claims (3)

1. A fuel oil droplet combustion system with adjustable combustion intensity, characterized in that it comprises a gas distribution system, a flow regulating system, a burner, and a cooling system, and the gas distribution system comprises a propane supply cylinder (1), an oxygen supply cylinder (2), an air supply cylinder (3), an air storage tank (11), a gas storage tank shut-off valve (10) is provided at the mouth of the air storage tank (11), and the propane gas supply cylinder (1) The bottle mouth is connected to the gas storage tank shut-off valve (10) of the gas storage tank (11) through the propane gas cylinder cut-off valve (4) and the propane gas supply pressure reducing valve (9) in turn, and the oxygen gas supply cylinder (2) is sequentially The oxygen cylinder cut-off valve (5) and the oxygen supply gas pressure reducing valve (8) are connected to the gas storage tank cut-off valve (10) of the gas storage tank (11), and the air supply cylinder (3) is cut off by the air cylinder in turn. The valve (6) and the air supply pressure reducing valve (7) are connected with the air storage tank shut-off valve (10) of the air storage tank (11); The flow regulating system comprises an air supply pressure reducing valve (12) and a needle valve (13) of an air storage tank, and the air storage tank shut-off valve (10) of the air storage tank (11) sequentially decompresses the air supply through the air storage tank The valve (12) and the needle valve (13) are connected with the inlet port (22) of the burner, and the cooling system is connected with the water inlet port (19) and the return water port (20) of the burner for working on the burner Circulating cooling when The gas distribution system stores propane, oxygen and air in the gas storage tank (11) according to the pressure from low to high by sequentially switching the shut-off valves and the air supply pressure reducing valve to complete the gas distribution operation of the combustible mixture , the flow adjustment system is used for stepless flow adjustment of the combustible gas mixture delivered to the burner by the gas storage tank (11), and the combustible gas mixture entering the burner forms a homogeneous and stable flame after being ignited. (26) The falling fuel droplets complete the oil droplet combustion process near the flame. 2. The fuel droplet combustion system with adjustable combustion intensity according to claim 1, characterized in that: the propane gas supply cylinder (1) is connected to a propane gas cylinder shut-off valve (4) at the bottle mouth, and the propane gas cylinder The cut-off valve (4) is connected to the propane gas supply pressure reducing valve (9) through a hose, the propane gas supply pressure reducing valve (9) is connected to the gas storage tank cut-off valve (10) through a hose, and the oxygen supply gas The bottle mouth of the bottle (2) is connected to the oxygen bottle cut-off valve (5), and the oxygen bottle cut-off valve (5) is connected to the oxygen supply gas pressure reducing valve (8) through a hose, and the oxygen gas supply pressure reducing valve (8) It is connected with the shut-off valve (10) of the air storage tank through a hose, the bottle mouth of the air supply bottle (3) is connected with the shut-off valve (6) of the air bottle, and the shut-off valve (6) of the air bottle is supplied with air through a flexible tube. The pressure reducing valve (7) is connected, the air supply pressure reducing valve (7) is connected with the air storage tank stop valve (10) through the hose, and the air storage tank stop valve (10) is connected with the air storage tank through the hose The air supply pressure reducing valve (12) is connected, and the air supply pressure reducing valve (12) of the air storage tank is connected with the needle valve (13) through a hose. 3. The fuel droplet combustion system with adjustable combustion intensity according to claim 1, wherein the burner comprises a burner cavity (16), and the burner cavity (16) is divided into liquid A cavity (17) and a ventilation cavity (18), the cooling system includes an electric pump (15) and a water tank (14), the end cover (21) covers the liquid passing cavity (17), the water inlet port ( 19) Set at the water inlet end of the liquid passage chamber (17), the water return port (20) is set at the water return end of the liquid passage chamber (17), and the water inlet port (19) is connected with the electric pump (15), The electric pump (15) sucks cooling water from the water tank (14), the water of the return water interface (20) flows back to the water tank (14), and the venting cavity (18) passes through the gland (23) and the pressure. The tightening bolt (24) presses and fixes the porous medium plate (25), the central pipe (26) is sealed through the middle of the ventilation cavity (18) and the liquid passing cavity (17), and the air inlet port (22) is provided with At the air inlet end of the ventilation cavity (18).

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