Fuel supply device for cup type burner
Technical Field
The utility model relates to a cup type combustor equipment technical field, concretely relates to a fuel feeding device for cup type combustor.
Background
Since the application principle and method of cup burner in measuring Fire extinguishing agent concentration was introduced in the paper of r.hirst and k.booth (Hirst R, Booth k.measurement of flame-extinguishing concentrations [ J ]. Fire Technology,1977,13(4):296-315.) in the system, the cup burner is a laboratory-scale coaxial diffusion flame device, because of its sufficient oxygen supply, its flame is less affected by ambient gas flow, its flame structure is stable, and it is more difficult to extinguish than actual flame, and is widely used in flame structure research and Fire extinguishing agent critical extinguishing concentration measurement, and the cup burner method has been listed in the relevant national and international standards for testing Fire extinguishing agent concentration.
In the existing experimental method based on the cup type combustor, the liquid level in the combustion cup needs to be kept constant under the condition that combustible liquid is used as fuel. The combustion cup is connected with the liquid storage container through the communicating pipe, so that the fuel liquid level in the combustion cup can be maintained by adjusting the liquid level in the liquid storage container. In the existing cup-type burner equipment and the testing method, the liquid level in the combustion cup is generally maintained by observing the liquid level of the combustion cup and then manually adjusting the height of a lifting platform bearing a liquid storage container. During the combustion process, fuel is consumed at all times, and the fuel mass loss rate changes at all times due to changes in combustion efficiency, combustion temperature and other factors. Moreover, because the flame of the cup type burner is relatively small, the slight fluctuation of the liquid level in the combustion cup is not easy to observe; in the process of adjusting the height of the liquid level of the combustion cup by adjusting the lifting platform, combustible liquid in the combustion cup is overflowed sometimes due to poor adjusting precision. In the fuel combustion process, the temperature of the combustion cup is high, the combustion rate is increased due to the rapid increase of liquid in the cup, the flame height is rapidly increased, the obvious flame oscillation phenomenon occurs, the flame oscillation phenomenon is not consistent with the test standard condition, and the experiment result is greatly influenced; and the fuel overflow sometimes can lead to flame splash, easily takes place the fire incident. Meanwhile, when the combustion phenomenon is researched, the mass loss rate of the fuel is a key parameter in the experiment. The existing device needs to manually adjust the height of the liquid level in the experimental process because the liquid storage container and the cup body are connected through the communicating vessel, and the mass loss rate in the combustion process of the combustible liquid can not be accurately measured. When the cup type burner is used for researching the combustion phenomenon and evaluating the efficiency of the fire extinguishing agent, the researched fuel is not only liquid combustible but also comprises gas combustible, and the existing device can not integrate the supply of the two types of combustible.
Chinese patent CN103454387B discloses a cup burner for foam extinguishing agent experiments, for the liquid fuel supply part, it uses three liquid containers of different heights to realize the control of the cup body liquid level, the device structure is complex, the recycling of collected liquid fuel can not be realized, the fuel supply rate can not be effectively controlled, the fuel quality loss rate can not be measured by this device, and the transportation of gas fuel can not be realized. The experimental equipment and the method provided by the document (Zhaohonghai composite gas fire extinguishing agent synergistic fire extinguishing performance research [ J ]. fire control science and technology, 2017 (2); Liming, Wang Steel. cup type burner is used for measuring the fire extinguishing volume fraction [ J ] of the gas fire extinguishing agent [ fire control science and technology, 2005,24(2): 218-doped 219; Fried, Chentao, Zhoushao, et al, heptafluoropropane and hydrogen fluoride generated in the flame action process research [ J ]. combustion science and technology, 2011,17(4).) need to maintain the height of the liquid level of a cup body by adjusting a liquid storage container platform, and can not overcome the fuel supply defect of the traditional cup type burner.
The existing device has the limitations that the effective control of the liquid level height of the cup body of the cup type burner cannot be met, and the mass loss rate of liquid fuel and the supply of various types of fuel to the cup type burner cannot be accurately measured. The device is complicated and inconvenient to use.
SUMMERY OF THE UTILITY MODEL
In order to solve the defects of the cup type burner device and the problems existing in the practical use, the utility model provides a fuel supply device for the cup type burner.
In order to achieve the above object, the utility model adopts the following technical scheme:
a fuel supply device for a cup type burner comprises a liquid storage container, an overflow pipe, a flow monitor, a liquid storage container, an electronic balance, a pump, a four-way pipe fitting, a stop valve, a combustible gas supply pipeline, a backfire preventer, a flow controller, a pressure reducing valve, a combustion cup, a rectifying net, glass beads, a stainless steel base, a quartz cup cover, an air and fire extinguishing agent supply pipeline and an isolation net; the liquid storage container is connected with the combustion cup through a stop valve and a four-way pipe fitting through a conveying pipeline, the top end of the overflow pipe and the top end of the combustion cup are located on the same horizontal line, when the height of liquid in the combustion cup exceeds the top end of the overflow pipe, the liquid flows into the liquid collection container through the overflow pipe and a flow monitor, the liquid collection container is placed above the electronic balance, and combustible liquid in the container is conveyed into the liquid storage container through a pump; the combustible liquid in the combustion cup and the liquid storage container is communicated with the lower end of the overflow pipe through a four-way pipe and a stop valve; when the supplied fuel is combustible gas, the rectifying net is tightly attached to the wall surface of the combustion cup and is placed in the combustion cup, and the combustible gas is communicated with the combustion cup through a combustible gas supply pipeline through a pressure reducing valve, a flow controller, a backfire preventer, a stop valve, a four-way pipe fitting and the rectifying net; the combustion cup is positioned on the central axis of the quartz cup cover, the quartz cup cover is placed on the stainless steel base, and glass beads are filled in the stainless steel base; an isolation net is arranged at the joint of the air and fire extinguishing agent supply pipeline and the stainless steel base;
the liquid storage container is used for supplying combustible liquid to the combustion cup and controlling the height of the liquid in the combustion cup;
the overflow pipe is used for controlling the liquid level in the liquid storage container;
the flow monitoring meter is used for monitoring the real-time flow of the liquid flowing through the overflow pipe from the liquid storage container;
the liquid collecting container is used for collecting the liquid in the overflow pipe and supplying combustible liquid to the liquid supply and storage container;
the electronic balance is used for monitoring the real-time mass change of the combustible liquid in the liquid collecting container;
the pump is used for conveying the combustible liquid in the liquid collecting container to the liquid storage container;
the four-way pipe fitting is used for connecting the liquid storage container, the combustion cup, the combustible gas supply pipeline and the overflow pipe;
the stop valve is arranged on each pipeline connected with the four-way pipe fitting and used for controlling the communication of each pipeline;
the combustible gas supply pipeline is used for supplying fuel gas to the combustion cup, and the pressure reducing valve, the flow controller and the backfire preventer are arranged on the pipeline and are respectively used for controlling the pressure and the flow of the fuel gas entering the pipeline and preventing flame from spreading towards the direction of a pipeline gas source;
the combustion cup, the quartz cup cover, the stainless steel base, the rectifying net, the glass beads, the air and fire extinguishing agent supply pipeline and the isolation net form a cup type combustor main body; the combustion cup is used for containing fuel and supporting flame for combustion; the quartz cup cover is used for isolating the combustion cup from the environment and reducing the interference of the environmental airflow to the flame of the combustion cup; the rectification net can make the fuel gas flow uniformly; the glass beads are used for rectifying air and fire extinguishing agent gas; the separation net is used for preventing the glass beads from entering the air and fire extinguishing agent supply pipeline.
The number of layers of the rectifying net is at least one, and the rectifying net can be made of stainless steel and ceramic materials and is used for rectifying the gas fuel.
When combustible liquid is supplied, the combustible liquid among the liquid storage container, the combustion cup and the connecting pipeline can be released into the overflow pipe through the stop valve and the four-way pipe fitting to enter the liquid collection container, so that the recovery of the combustible liquid is realized.
The combustible liquid in the utility model can be, but is not limited to heptane, gasoline, diesel oil, aviation kerosene, alcohol substances, aldehyde substances, ketone substances, benzene and homologues thereof and the like.
The combustible gas in the utility model can be, but is not limited to, alkane, alkene, alkyne gas, liquefied petroleum gas and natural gas.
Compared with the prior art, the utility model, its advantage is as follows:
1. the liquid level of the liquid fuel combustion cup can be accurately controlled;
2. accurate measurement of the fuel mass loss rate can be achieved;
3. the combustible liquid can be recycled;
3. the supply of different kinds of fuel can be realized;
4. the device has high integration degree and simple and convenient operation.
Drawings
Fig. 1 is a front view of a fuel supply device for a cup burner according to the present invention.
Fig. 2 is a schematic plan view of the structure of the device of the present invention.
Fig. 3 is a schematic view of a rectifier network, in which fig. 3(a) is a plan view and fig. 3(b) is a front view.
FIG. 4 is a schematic view of the four-way fitting and shut-off valve connection.
In the figure, 1 is a liquid storage container; 2 is an overflow pipe; 3 is a flow monitoring meter; 4 is a pump; 5 is a liquid collecting container; 6 is an electronic balance; 7 is a stop valve; 8 is a four-way pipe fitting; 9 is a backfire arrester; 10 is a flow controller; 11 is a pressure reducing valve; 12 is a combustible gas supply line; 13 is air and fire extinguishing agent supply line; 14 is a combustion cup; 15 is a rectifying net; 16 is glass beads; 17 is a stainless steel base; 18 is a quartz cup cover; 19 is an isolation net.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and the embodiments.
As shown in fig. 1 and 2, the utility model discloses a fuel supply device for cup type combustor, including stock solution container 1, overflow pipe 2, flow monitor 3, pump 4, liquid collecting container 5, electronic balance 6, stop valve 7, four-way pipe fitting 8, tempering prevention ware 9, flow controller 10, relief pressure valve 11, combustible gas supply line 12, air and fire extinguishing agent supply line 13, burning cup 14, rectifier net 15, glass pearl 16, stainless steel base 17, quartz cup cover 18, separation net 19. The parts are connected by mechanical connection and transport pipelines to form a set of device.
The liquid storage container 1 is connected with the combustion cup 14 through a stop valve 7 and a four-way pipe 8 through a conveying pipeline, an overflow pipe 2 is arranged in the liquid storage container 1, the height of the overflow pipe 2 and the top end of the combustion cup 14 are located on the same horizontal line, when the height of liquid in the combustion cup 14 exceeds the height of the top end of the overflow pipe 2, the liquid flows into the liquid collecting container 5 through an upper pipe opening of the overflow pipe 2 through the flow monitor 3, the liquid collecting container 5 is placed above the electronic balance 6, and combustible liquid in the liquid collecting container 5 can be conveyed into the liquid storage container 1 through the pump 4; the combustion cup 14 is communicated with combustible liquid in the liquid storage container 1 through a four-way pipe fitting 8 and a stop valve 7 with the overflow pipe 2; when the fuel is supplied as gas, the rectifying net 15 is put into the combustion cup 14. The combustible gas is communicated with a combustion cup 14 through a combustible gas supply pipeline 12, a pressure reducing valve 11, a flow controller 10, a backfire preventer 9, a stop valve 7, a four-way pipe fitting 8 and a rectifying net 15; the combustion cup 14 is positioned on the central axis of the quartz cup cover 18, the quartz cup cover 18 is placed on the stainless steel base 17, and the base 17 is filled with glass beads 16; an isolation net 19 is arranged at the joint of the air and fire extinguishing agent supply pipeline 13 and the stainless steel base 17.
In the embodiment, the liquid storage container 1 and the overflow pipe 2 are made of stainless steel, and the overflow pipe 2 is connected with the liquid storage container 1 in a welding mode;
in this embodiment, as shown in fig. 3, the rectifying net 15 is made of stainless steel, the mesh is a regular triangle with a side length of 1mm, and the height is 50mm, so as to form a multi-layer cylindrical cage structure, and the outer diameter of the cylindrical cage structure is consistent with the inner diameter of the combustion cup 14, so that the rectifying net 15 is tightly attached to the wall surface of the combustion cup 14;
in this embodiment, the glass beads 16 are chemically inert spherical glass beads with a diameter of 3mm, and are filled with the stainless steel base 17;
in this embodiment, the isolation net 19 is a single-layer stainless steel net with a diameter of 1mm circular mesh, and is welded to the stainless steel base 17 to prevent the glass beads 16 from entering the air and fire extinguishing agent supply line 13.
The utility model discloses well fuel mass loss's measurement accessible electronic balance 6, flow monitor 3, pump 4, flow controller 10 realize. When the fuel is combustible liquid, the mass of the fuel in the combustion cup 14 is continuously consumed in the combustion process, the liquid level height of the liquid storage container 1 is always consistent with that of the combustion cup 14 due to the supply of the pump 4, the mass of the liquid storage container is not changed, and the mass change of the whole liquid supply system is only reflected on the liquid collection container 5, so that the mass loss of the liquid fuel can be obtained by monitoring the mass change of the liquid collection container 5 in the combustion process in real time through the electronic balance 6; meanwhile, in order to keep the liquid level in the liquid storage container 1 consistent with the height in the combustion cup 14, the liquid collecting container 5 needs to continuously supply the liquid fuel into the liquid storage container 1 by setting a constant mass flow of the pump 4, the liquid level exceeds the height of the overflow pipe 2 and then flows into the liquid collecting container 5 through the flow monitor 3, and the mass loss rate of the fuel can be calculated through the difference between the mass flow of the pump 4 and the mass flow monitored by the flow monitor 3. When supplying the gaseous fuel, the mass loss of the gaseous fuel is obtained directly from the mass flow rate of the gaseous fuel set by the flow controller 10 connected to the combustible gas supply line 12.
The utility model discloses well supply of different fuel and liquid fuel's recovery is realized through tee bend 8 and stop valve 7, introduces concrete mode with figure 1 and figure 4:
when the combustible liquid fuel is supplied, the a and b valves of the shutoff valves 7 are opened, and the remaining shutoff valves are closed. The liquid collecting container 5 is filled with combustible liquid, the constant mass flow of the pump 4 is set, and after the pump 4 is started, the combustible liquid is supplied to the liquid storage container 1 through a pipeline. Due to the principle of communicating pipes, the fuel quickly reaches the top end of the combustion cup 14 of the cup-type combustor, when the liquid level in the liquid storage container 1 reaches the pipe opening of the overflow pipe 2, the liquid fuel supplied from the liquid collection container 5 enters the liquid collection container 5 again through the overflow pipe 2, and therefore the liquid level stability of the combustion cup 14 and the recycling of the fuel are maintained; after the experiment is completed, the pump 4 is closed, a large amount of combustible liquid is left in the liquid storage container 1, the connecting pipeline and the combustion cup 14, the valve d in the stop valve 7 is opened at the moment, the combustible liquid flows into the overflow pipe 2 through the four-way pipe 8 and the stop valve 7d, and the combustible liquid is completely recovered by the liquid collection container.
When the combustible gas fuel is supplied, the valves c and b of the shutoff valves 7 are opened, and the remaining shutoff valves are closed. The rectifying net 15 is put into the combustion cup, the mass flow of the flow controller 10 is set, the pressure reducing valve 11 is opened and adjusted, the gas fuel enters the cup type combustor combustion cup 14 through the pipeline, and the backfire preventer 9 plays a safety protection role in preventing the combustible gas from being back-burned through the pipeline. After the experiment is finished, the pressure reducing valve is closed, and the combustible gas fuel is stopped from being supplied.
It is above only the utility model discloses preferred embodiment, the utility model discloses the protection scope does not confine above-mentioned embodiment to, the fan belongs to the utility model discloses technical scheme under the thinking all belongs to the utility model discloses a protection scope.