阅读说明：本技术 一种炉头、火焰炉、热流量实验台系统 (Furnace end, flame stove, heat flow laboratory bench system ) 是由 李海涛 阳业 陈元熙 于 2021-03-23 设计创作，主要内容包括：本发明提供一种炉头、火焰炉、热流量实验台系统,涉及火焰燃烧领域。一种炉头,包括导流体、燃烧头和保温套,导流体具有沿设定方向设置的第一气流通道；燃烧头套设于导流体上,其上设有部分暴露第二开口的燃烧孔,燃烧孔中设有燃烧网；保温套套设于燃烧头上,且二者之间具有以形成空腔的间隙,空腔用于以通入换热介质控制所述第一气流通道内的温度。一种火焰炉,包括上述的炉头和连接于炉头的炉膛。一种热流量实验台系统,包括上述的火焰炉、连接于炉膛的供气装置、连接于火焰炉的换热介质提供装置和测控装置。本发明能够解决目前缺乏对预混层流火焰速度测量和层流蜂窝状火焰现象观测的有效设备的技术问题。(The invention provides a furnace end, a flame furnace and a heat flow experiment table system, and relates to the field of flame combustion. A furnace end comprises a flow guide body, a combustion head and a heat insulation sleeve, wherein the flow guide body is provided with a first air flow channel arranged along a set direction; the combustion head is sleeved on the flow guide body, combustion holes with parts exposed out of the second openings are formed in the combustion head, and combustion nets are arranged in the combustion holes; the heat-insulating sleeve is sleeved on the combustion head, a gap for forming a cavity is formed between the heat-insulating sleeve and the combustion head, and the cavity is used for controlling the temperature in the first air flow channel by introducing a heat exchange medium. A flame stove comprises the furnace end and a hearth connected with the furnace end. A heat flow experiment table system comprises the flame furnace, a gas supply device connected to a hearth, a heat exchange medium supply device connected to the flame furnace and a measurement and control device. The invention can solve the technical problem that effective equipment for measuring the speed of the premixed laminar flame and observing the laminar honeycomb flame phenomenon is lacked at present.)

1. A burner, comprising:

a flow conductor (201), the flow conductor (201) having a first air flow passage arranged along a set direction, the first air flow passage gradually converging from a first opening (2011) along the set direction and terminating at a second opening (2012);

the combustion head (202) is sleeved on the flow guide body (201), a combustion hole (2021) at least partially exposing the second opening (2012) is formed in the combustion head (202), a combustion net (800) is arranged in the combustion hole (2021), a temperature measuring element is arranged on the combustion net (800), the temperature measuring element is arranged in a ring shape at the center of the combustion net (800), and multiple rings are arranged at a set distance;

the heat insulation sleeve (203) is sleeved on the combustion head (202), a gap for forming a cavity is formed between the heat insulation sleeve (203) and the combustion head, and the cavity is used for controlling the temperature in the first air flow channel by introducing a heat exchange medium.

2. The burner of claim 1, wherein the jacket (203) has a burner inlet pipe (2031) and a burner outlet pipe (2032) that communicate with the cavity.

3. A flame burner, comprising:

a jamb according to any of the preceding claims 1-2;

the furnace hearth (400) is connected to the first opening (2011), a second airflow channel arranged along a set direction is arranged on the furnace hearth (400), a mixing partition plate (1100) is arranged in the second airflow channel, the mixing partition plate (1100) is provided with a plurality of through grooves (1101), and a plurality of air holes (1102) are arranged in the through grooves (1101);

the hearth (400) is provided with a furnace wall, a chamber (403) is arranged in the furnace wall, and the chamber (403) is used for controlling the temperature in the second airflow channel by introducing a heat exchange medium;

the second air flow passage is communicated with the first air flow passage, and air flows from the second air flow passage to the first air flow passage.

4. The flame furnace according to claim 3, wherein the furnace wall is provided with a furnace feed pipe (401) and a furnace discharge pipe (402) communicating with the chamber.

5. The flame furnace according to claim 4, further comprising a heat-insulating housing (300), wherein the heat-insulating housing (300) is sleeved outside the hearth (400).

6. A heat flux laboratory bench system for observing a flame of a combustible gas, said laboratory bench system comprising:

a flame burner as claimed in any one of the preceding claims 3 to 5;

a gas supply device connected to the hearth (400), wherein the gas supply device supplies combustible gas to the flame furnace through the second gas flow channel;

a heat exchange medium supply device connected with a heat insulation sleeve (203) of the flame furnace and a hearth (400), wherein the heat exchange medium supply device is used for supplying a heat exchange medium to the cavity and the chamber so as to keep the first air flow channel and the second air flow channel at constant temperature;

and the measurement and control device is used for controlling the flame furnace to work in different combustion modes.

7. The heat flow bench system of claim 6, wherein the combustion mode is determined by one or more of a temperature of a heat exchange medium, a gas flow rate, a composition of a combustible gas.

8. The heat flow laboratory bench system according to claim 7, wherein the gas supply device comprises a flammable gas branch, a nitrogen branch and an exhaust branch, the flammable gas branch and the nitrogen branch are respectively provided with a flow controller, and the flow controllers are used for changing the ratio of the gases in each branch;

and the exhaust branch is used for exhausting residual gas in each branch when the combustible gas branch and the nitrogen branch are closed.

Technical Field

The application relates to the field of flame combustion, in particular to a furnace end, a flame furnace and a heat flow experiment table system.

Background

With the continuous progress of science and technology, scientific research is continuously advanced. The demands for premixed laminar flame speed measurement and laminar honeycomb flame phenomenon observation are increasing.

But at present, effective equipment for measuring the speed of the premixed laminar flame and observing the laminar honeycomb-shaped flame phenomenon is lacked.

Disclosure of Invention

A first object of the embodiments of the present application is to provide a burner, which is configured to burn a combustible gas on the burner and measure a combustion temperature of the combustible gas in a burner environment with different temperatures.

Another object of the embodiments of the present application is to provide a flame furnace, which can solve the technical problem of the lack of effective equipment for measuring the velocity of premixed laminar flame at different temperatures and observing the combustion phenomenon thereof.

Another object of the embodiments of the present application is to provide a heat flux experiment table system, which can perform an experiment using the flame furnace, and complete measurement and recording of flame burning speed under preset parameters, and analyze experimental data.

In a first aspect, an embodiment of the present application provides a furnace end, including a baffle, a burner and a thermal insulation sleeve. The flow guide body is provided with a first air flow channel arranged along a set direction. The first air flow passage gradually shrinks from the first opening along the set direction and ends at the second opening. The combustion head is sleeved on the flow guide body, and combustion holes with parts exposed out of the second opening are formed in the combustion head. The burning net is arranged in the burning hole. The combustion net is provided with a temperature measuring element. The temperature measuring elements are arranged in a central ring of the combustion net and are provided with a plurality of rings at set distances. The heat-insulating sleeve is sleeved on the combustion head, and a gap for forming a cavity is arranged between the heat-insulating sleeve and the combustion head. The cavity is used for controlling the temperature in the first air flow channel by introducing a heat exchange medium.

In the implementation process, the flow guide body of the furnace end is set to be of a structure with a first air flow channel inside. The first air flow channel has the characteristic of gradually contracting along the channel direction, so that the guide body is of a structure with the second opening smaller than the first opening, and the air flow in the guide body can be gathered when the air flow flows from the first air flow channel to the second opening through the first opening of the guide body.

In addition, the guide body is sleeved with the combustion head, the combustion head is provided with the combustion hole, and the combustion hole has the characteristic that part or all of the second opening of the guide body is exposed, so that the airflow can be partially or completely gathered in the combustion hole; the combustion holes are internally provided with a combustion net, and the combustion net is provided with a temperature measuring element, so that the combustible gas is combusted at the combustion net, and the combustion temperature of flame is measured by the temperature measuring element.

Meanwhile, the combustion head is sleeved with the heat insulation sleeve, and a certain gap is formed between the heat insulation sleeve and the combustion head, so that a cavity with a certain space is formed between the heat insulation sleeve and the combustion head. And furthermore, the flow guide body wrapped by the heat insulation sleeve has a certain temperature in a mode of introducing a heat exchange medium into the cavity. The temperature in the flow guide body can be kept constant by introducing a constant-temperature heat exchange medium, and the temperature in the flow guide body can be changed by introducing a variable-temperature heat exchange medium. In a word, make the furnace end inside temperature receive heat transfer medium's temperature influence through the mode that lets in heat transfer medium with setting up the insulation cover and the cavity in the insulation cover, and do not receive ambient temperature's influence, play the effect of isolated environment for furnace end and inside environment become an independent microsystem, and then make the burning net edge have stable temperature.

The combustion net is provided with the temperature measuring element, so that the combustible gas is combusted on the combustion net, and the combustion temperature can be measured through the temperature measuring element; the temperature measuring elements are uniformly distributed in a concentric circular ring-shaped arrangement mode, so that the temperature measurement is more accurate.

Combine the first aspect, be equipped with furnace end inlet pipe and furnace end discharging pipe with cavity UNICOM on the insulation cover.

In the implementation process, the heat exchange medium can be introduced into the cavity through the furnace end feeding pipe, and then the heat exchange medium is discharged through the furnace end discharging pipe.

It should be noted that, the heat exchange medium can be introduced and discharged according to actual requirements, for example, in actual conditions, flame combustion can be finished in a short time, and then the heat exchange medium is introduced only through the furnace end feeding pipe, and after the combustion is finished, the heat exchange medium is discharged through the furnace end discharging pipe; in another case, in order to prevent the influence of the external environment temperature on the flame combustion and simultaneously require the flame combustion for a longer time to obtain better temperature measurement and flame combustion observation effects, the heat exchange medium needs to be continuously introduced at this time to prevent the heat exchange medium from being cooled after a longer time, so that the influence of the environment temperature on the results of the flame combustion temperature measurement and the flame combustion phenomenon observation is avoided. At this time, the heat exchange medium needs to be continuously introduced into the cavity. Under another kind of extreme condition, furnace end inlet pipe and furnace end discharging pipe can be same pipe, only sets up a pipe promptly, both act as the furnace end inlet pipe and act as the furnace end discharging pipe again.

In a second aspect, the embodiment of the present application provides a flame stove, which includes the above-mentioned furnace end and furnace hearth. Wherein, furnace connects in the first opening part of furnace end, and it is equipped with the second air current passageway that sets up along setting for the direction. A mixing baffle plate is arranged in the second airflow channel. The mixed baffle is equipped with a plurality of logical grooves, leads to the inslot and is equipped with a plurality of gas pockets. The hearth is provided with a furnace wall, a chamber is arranged in the furnace wall, and the chamber is used for controlling the temperature in the second airflow channel by introducing a heat exchange medium. The second airflow passage is communicated with the first airflow passage, and airflow flows from the second airflow passage to the first airflow passage.

In the implementation process, the hearth is arranged to be of a structure with a second airflow channel inside, so that airflow can circulate inside the hearth.

In addition, the hearth is connected with the furnace end, and the second airflow channel is communicated with the first airflow channel, so that airflow can flow into the furnace end through the second airflow channel of the hearth, and flows to the first opening through the second opening of the flow guide body of the furnace end, and is gathered at the combustion net. In the process, the air flow firstly flows through the mixing partition plate and continues to flow along the second air flow channel to the first air flow channel through the air holes on the mixing partition plate. It is noted that the gas flow may be a single component gas or a mixture of a plurality of component gases. The mixing baffle plate is used for enabling the airflow to be uniform and stable. After the air flow passes through the mixing partition plate, the flow state of the air flow is improved, uniform steady flow is formed, and under the condition that the second air flow channel is designed to be long enough, the laminar flow state is gradually formed in the process of continuously flowing to the first air flow channel. However, the furnace wall of the hearth can also have a condition of blocking airflow to influence the airflow flowing state, so that the flow guide body is designed into a gradually shrinking shape, and in the process that airflow flows from the second airflow channel to the first airflow channel, the gradually shrinking flow guide body concentrates the airflow on one hand, and on the other hand, the influence of the furnace wall of the hearth on the airflow blocking to influence the laminar flow state of the airflow is reduced, so that the airflow is still in a uniform and stable laminar flow state when reaching the combustion net.

The factors influencing the flowing state of the airflow also comprise the temperature, different temperatures can influence the viscous resistance of the airflow so as to change the flowing state of the airflow, the flowing state of the airflow can influence the combustion state of the airflow during combustion, when the airflow is in a uniform and stable state, the airflow is also in a uniform and stable state, and the flame combustion layer is at the same horizontal height, namely when the flame is combusted, the combustion temperature at the same horizontal height is the same, so that the measurement of the combustion speed of the flame is facilitated, and the observation of the flame combustion phenomenon is also facilitated; if the airflow is in a non-uniform and stable flowing state, the flame is also in non-uniform and stable combustion during combustion, and the combustion temperature of the flame at the same horizontal height is different, so that the measurement of the combustion speed of the flame is deviated, and the observation of the flame combustion phenomenon is not facilitated.

In the measurement of the flame combustion speed, the temperature of the flame combustion at each position on the combustion net can be measured through the temperature measuring elements arranged on the combustion net, and according to the principle that the flame combustion speed is equal to the incoming flow speed of unburned gas under the uniform and stable combustion state of gas, when the temperatures of the temperature measuring elements at each position on the combustion net are consistent, the flame can be known to be in the uniform and stable combustion state, and the combustion speed of the flame at the moment is the incoming flow speed of the unburned gas.

Therefore, in order to avoid the influence of the temperature of the external environment on the viscous resistance change of the airflow and further change the flowing state of the airflow, the airflow needs to be isolated from the external environment, and the temperature of the airflow needs to be adjusted according to the actual flame combustion, so that the combustion speed of the airflow at different temperatures can be measured and the combustion phenomenon can be observed conveniently.

For this purpose, the furnace is provided as a structure with a certain thickness, in the walls of which chambers are provided. So that the hearth has certain temperature by introducing heat exchange medium into the chamber. The temperature in the hearth can be kept constant by introducing a constant-temperature heat exchange medium, and the temperature in the hearth can be changed by introducing a variable-temperature heat exchange medium. In a word, through make the inside temperature of furnace receive heat transfer medium's temperature influence with the mode that sets up the cavity and let in heat transfer medium in the cavity, and do not receive ambient temperature's influence, play the effect of isolated environment for furnace and its internal environment become an independent little system. And adverse influence of the external environment temperature on the airflow is avoided.

It should be noted that, because furnace and furnace end are all through letting in heat transfer medium's mode for furnace and furnace end all become the little system that exists independent of external environment, do not receive external environment's interference. According to actual needs, the hearth and the furnace end can be set to be at the same temperature, and different temperatures can also be set. This requires adaptation according to the actual requirements.

In combination with the second aspect, a hearth feed pipe and a hearth discharge pipe communicated with the cavity are arranged on the furnace wall.

In the implementation process, the heat exchange medium can be introduced into the cavity through the hearth feeding pipe, and then the heat exchange medium is discharged through the hearth discharging pipe.

It should be noted that, the heat exchange medium can be introduced and discharged according to actual requirements, for example, in actual conditions, flame combustion can be finished in a short time, and then the heat exchange medium is introduced only through the furnace end feeding pipe, and after the combustion is finished, the heat exchange medium is discharged through the furnace end discharging pipe; in another case, in order to prevent the influence of the external environment temperature on the flame combustion and simultaneously require the flame combustion for a longer time to obtain better temperature measurement and flame combustion observation effects, the heat exchange medium needs to be continuously introduced at this time to prevent the heat exchange medium from being cooled after a longer time, so that the influence of the environment temperature on the results of the flame combustion temperature measurement and the flame combustion phenomenon observation is avoided. At this time, the heat exchange medium needs to be continuously introduced into the cavity. In another extreme case, furnace inlet pipe and furnace discharging pipe can be same pipe, only sets up a pipe promptly, both act as the furnace inlet pipe and act as the furnace discharging pipe again.

With reference to the second aspect, the flame furnace further comprises a heat-insulating housing. The heat preservation shell is sleeved outside the hearth.

In the above-mentioned realization process, because the volume of furnace probably is greater than the volume of furnace end in the demand of reality for furnace reaches isolated external environment interference's ability not as furnace end through letting in heat transfer medium and reaches isolated external environment interference's ability, so need establish one deck heat preservation overcoat outside furnace again, make furnace combine the mode that lets in heat transfer medium can reach better isolated external environment's ability.

In a third aspect, an embodiment of the present application provides a heat flux experiment table system for measuring a flame combustion speed of a combustible gas and observing a flame combustion phenomenon, where the experiment table system includes the flame furnace, a gas supply device, a heat exchange medium supply device, and a measurement and control device. The gas supply device is connected to the hearth and supplies combustible gas to the flame furnace through the second gas flow channel. And the heat exchange medium supply device is connected to the flame furnace and is used for supplying a heat exchange medium to the cavity and the empty chamber so as to keep the temperature of the first air flow channel and the second air flow channel constant. And the measurement and control device is used for controlling the flame furnace to work in different combustion modes, measuring and recording the combustion temperature of the flame and displaying the combustion temperature in real time.

In the implementation process, the measurement and control device is used as a master control device and can control the gas component proportion of the combustible gas introduced into the flame furnace by the gas supply device and the gas flow speed flowing into the flame furnace. Meanwhile, the heat exchange medium supply device can be controlled, so that the temperature of the heat exchange medium can be changed according to actual requirements, and the aim of changing the temperatures of a furnace end and a hearth of the flame furnace under the actual requirements is fulfilled.

It should be noted that for the purpose of the present application of measuring the flame combustion temperature and observing the flame combustion phenomenon under different conditions, it is necessary to operate the flame furnace under different conditions. The variables in this application are: the temperature of the flame furnace which is not interfered by the external environment, the component proportion of the combustible gas and the flow rate of the combustible gas.

The temperature of the flame furnace, which is not interfered by the external environment, is regulated by the heat exchange media respectively introduced into the cavity and the cavity, and the aim of controlling the temperature of the flame furnace can be achieved by changing the temperature of the heat exchange media; the component proportion of the combustible gas and the flow rate of the combustible gas are regulated and controlled by the gas supply device. Utilize measurement and control device control air feeder and heat transfer medium to provide the device, can be quick change corresponding variable according to the actual demand, reach flame stove under different operating conditions, measurement and control device measures and records and show combustion temperature in real time through the temperature element to flame combustion temperature.

In combination with the third aspect, the combustion mode is determined by one or more of the temperature of the heat exchange medium, the gas flow rate, and the composition of the combustible gas.

In the above implementation, the combustion mode is a mode according to which the adjustment is implemented by changing the above-described variables. Such modes can be classified into single variable modes, bivariable modes, and trivariable modes. For convenience of description, the temperature of the variable flame furnace, which is not interfered by the external environment, may be defined as a variable a1, the composition ratio of the combustible gas may be defined as a2, and the flow rate of the combustible gas may be defined as A3.

In the above modes, the single variable mode may again include changing only a1 without changing a2 and A3, changing only a2 without changing a1 and A3, changing only A3 without changing a1 and a 2. Then the flame furnace is enabled to work in various modes under the single variable mode through the measurement and control device, and different flame combustion speed measurement results and flame combustion phenomenon observation results can be obtained.

Among the above modes, the bivariate mode may again include changing only a1 and a2 without A3, changing only a1 and A3 without a2, and changing only a2 and A3 without a 1. Then the flame furnace is enabled to work in various modes under the double-variable mode through the measuring and controlling device, and different flame combustion speed measurement and flame combustion phenomenon observation results can be obtained.

In the above-described patterns, the three variable patterns, i.e., a1, a2, and A3, are all changed. Then the flame furnace is enabled to work under the three-variable mode through the measurement and control device, and different flame combustion speed measurement and flame combustion phenomenon observation results can be obtained.

With reference to the third aspect, the gas supply means includes a combustible gas branch, a nitrogen branch, and an exhaust branch. Wherein the combustible gas branch and the nitrogen branch are respectively provided with a flow controller. The flow controller is used for changing the gas ratio of each branch. The exhaust branch is used for exhausting residual gas in each branch when the combustible gas branch and the nitrogen branch are closed.

In the implementation process, the nitrogen is used for purging combustible gas to prevent explosion.

In the realization process above, this application realizes the completely cut off flame furnace with external environment through providing one kind in order to let in heat transfer medium, can change the temperature of furnace end and furnace through the temperature of adjusting the heat transfer medium who lets in furnace end and furnace for flame burning can go on under the temperature condition of difference. The technical problem that effective equipment for measuring the speed of the premixed laminar flame and observing the laminar honeycomb flame phenomenon is lacked at present is solved; simultaneously this application still provides a heat flow laboratory bench system, and it can utilize foretell flame stove to carry out the experiment to accomplish the measurement and the record of flame burning speed under the parameter of predetermineeing, and the analysis experiment data.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.

Fig. 1 is a flowchart of a thermal flow laboratory bench system according to an embodiment of the present disclosure;

FIG. 2 is a schematic structural diagram of a flame burner according to an embodiment of the present disclosure;

FIG. 3 is a schematic view of a flame furnace according to an embodiment of the present disclosure after removing a furnace cover;

FIG. 4 is a top view of a flame burner according to an embodiment of the present disclosure;

FIG. 5 is a cross-sectional view of a flame burner according to an embodiment of the present disclosure;

fig. 6 is a cross-sectional view of a burner of a flame burner according to an embodiment of the present disclosure;

FIG. 7 is a schematic structural view of a furnace cover of a flame furnace according to an embodiment of the present disclosure;

fig. 8 is a schematic structural diagram of a mixing partition plate of a flame burner according to an embodiment of the present disclosure.

Icon: 100-furnace cover; 200-a furnace end; 300-a heat-insulating shell; 400-hearth; 500-a connecting flange;

600-a gasket; 700-an air inlet pipe; 800-a combustion net; 900-a first O-ring; 1000-a second O-ring; 1100-hybrid septum; 401-hearth feed tube; 402-furnace discharge pipe; 403-a chamber;

201-a flow conductor; 202-a combustion head; 203-insulating sleeve; 2011-first opening; 2012-a second opening;

2021-combustion orifice; 2031-furnace end feed pipe; 2032-furnace end discharge pipe; 1101-through groove; 1102-air holes; 1200-a heat exchange medium providing means; 1300-gas supply means; 1400-measurement and control device; 1310-a methane cylinder; 1311-methane cylinder top valve; 1312-methane cylinder pressure reducing valve; 1313-methane ball valve;

1314-flame arrestor; 1315-methane mass flow meter; 1316-methane filter; 1320-nitrogen cylinder;

1321-nitrogen cylinder top valve; 1322-nitrogen relief valve; 1323-nitrogen ball valve; 1324-nitrogen mass flow meter; 1330-an air compressor; 1331-air ball valve; 1332-air filter; 1333-a compressed air pressure reducing valve; 1334-mass air flow meter; 1340-nitrogen purge valve; 1341-exhaust main valve.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.

Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.

The present application is specifically described below by way of embodiments of the present application with reference to fig. 1 to 8:

in a first aspect, an embodiment of the present application provides a furnace end 200.

First, as shown in fig. 6, the burner 200 includes a baffle 201.

In this example, current carrier 201 is provided in a cylindrical shape. A first air flow channel is formed in the center of the current carrier 201 in the direction of the arrow shown in fig. 6. The first air flow passage gradually converges from the first opening 2011 in the direction of the arrow and terminates at the second opening 2012. A hollow cylindrical structure with one end opening smaller than the other end opening is formed. When the airflow flows from the first opening 2011 to the second opening 2012, the airflow can be gathered on a path gradually contracting the second opening 2012, and then the airflow is stabilized.

In this example, the baffle 201 is vertically disposed, and the end with the smaller opening (i.e., the second opening 2012) is located above.

It should be understood that current carrier 201 is only one embodiment of the present application, and the present application does not limit the shape and configuration of current carrier 201. The current carrier 201 may also be configured in other shapes, such as a square, a truncated cone, etc.

Next, as shown in fig. 6, the burner 200 further includes a burner head 202. The burner head 202 is sleeved on the flow guiding body 201.

In this example, the combustion head 202 is configured to be circular and has a structure in which the combustion holes 2021 of the second opening 2012 are partially or entirely exposed. The size of the combustion hole 2021 is designed according to actual needs. In this example, the combustion hole 2021 is designed to have a diameter smaller than that of the second opening 2012.

In this example, a combustion net 800 is provided in the combustion hole 2021, and the combustible gas is ignited and burned in the combustion net 800. In order to measure the temperature of the flame during combustion, a temperature measuring element needs to be provided on the combustion net 800. In this example, the temperature measuring elements are arranged in a ring shape in the center of the combustion net 800, and are provided with multiple rings, for example, one ring, two rings, three rings, four rings, or five rings may be provided, and the number of the rings may be specifically set according to the requirement of actual measurement accuracy; each ring can be provided with one temperature measuring element, two temperature measuring elements, three temperature measuring elements, four temperature measuring elements or five temperature measuring elements, and the number of the temperature measuring elements arranged on each ring can be set according to actual measurement requirements.

In this example, a T-type thermocouple was selected as the temperature measuring element for use in the combustion of the combustible gas.

In a preferred embodiment, 2 thermocouples can be welded at the center of the combustion network 800, 3 thermocouples can be arranged on a circle with the diameter phi 8, 3 thermocouples can be arranged on a circle with the diameter phi 22, 3 thermocouples can be arranged on a circle with the diameter phi 35, the thermocouples on each circle are uniformly distributed, each layer of the thermocouples are staggered by an angle of 60 degrees, and 11 thermocouples are calculated.

It should be appreciated that the configuration of the burner head 202 as shown in fig. 6 is intended to match the shape of the baffle 201 described above. The shape and configuration of the burner head 202 as provided in the present example is not intended to be limiting solely thereto. The burner head 202 may also be configured in other shapes, such as square, frustoconical, etc.

Then, as shown in fig. 6, the burner 200 further includes a thermal sleeve 203. The thermal insulation sleeve 203 is sleeved on the combustion head 202.

In this example, the insulating jacket 203 is configured as a circular shell-like structure. Which is connected to the burner head 202 to form a sealed structure. And a certain gap is arranged between the two to form a cavity which has a certain space and surrounds the combustion head. The heat exchange medium is introduced into the cavity to achieve the purpose of controlling the temperature in the first air flow channel.

It will be appreciated that the configuration of the insulating sleeve 203 as shown in FIG. 6 is intended to match the shape of the burner head 202 as described above. The shape and configuration of the insulating sleeve 203 given in this example is not intended to be limited solely by this example. The insulating sleeve 203 may also be configured in other shapes, such as a square, a truncated cone, etc.

On the other hand, the cavity formed between the insulating sleeve 203 and the burner head 202 in this application is annular. The form and shape of the cavity is not uniquely determined by the present application. It should be understood that any cavity having features surrounding the burner head is satisfactory for the present application, and the cavity is not limited to being annular, but may be square, polygonal, or annular with a diameter that varies from top to bottom in the direction of the arrows shown in fig. 5, etc.

In this example, water is used as the heat exchange medium because water has good fluidity and thermal conductivity. The present example is not intended to be limiting. In other embodiments, other materials such as oil may be used as the heat transfer medium.

As shown in fig. 6, the heat-insulating sleeve 203 is provided with a furnace end inlet pipe 2031 communicated with the cavity for introducing a heat-exchanging medium and a furnace end outlet pipe 2032 for discharging the heat-exchanging medium.

In this example, the furnace end feed pipe 2031 and the furnace end discharge pipe 2032 are symmetrically arranged. However, in other examples, the jamb feed tube 2031 and the jamb discharge tube 2032 are not symmetrically positioned, such as 90 apart, 120 apart, etc.

In other extreme examples, the head feed pipe 2031 and head discharge pipe 2032 may be the same pipe. This is an installation mode in which flame combustion can be completed in a short time. The heat transfer medium can not produce huge temperature difference in this moment short time, and the inside temperature of furnace end 200 can not take place huge change in the short time promptly, can not produce decisive influence to the result of experiment.

As shown in fig. 6, in the present example, when the burner head 202 is sleeved and connected with the flow guiding body 201, a first O-ring 900 is further used as a connection intermediate body between the burner head and the flow guiding body. The first O-ring 900 serves both for sealing and for strengthening the connection.

In a second aspect, embodiments of the present application provide a flame burner, as shown in fig. 5, including the burner 200 and the hearth 400 described above.

The hearth 400 is configured to be cylindrical and is connected to the first opening 2011 of the burner 200. The furnace 400 is provided with a second airflow channel inside along the direction of the arrow shown in fig. 5, and the second airflow channel is communicated with the first airflow channel. In use, the airflow first passes through the second airflow passage and then enters the first airflow passage.

While the furnace 400 has furnace walls. A chamber 403 is provided in the furnace wall. And introducing a heat exchange medium into the chamber to achieve the purpose of controlling the temperature in the second airflow channel.

As shown in fig. 5, when the hearth 400 and the burner 200 are connected, a second O-ring 1000 is used as a connecting intermediate body between the two. The second O-ring 1000 serves both for sealing and for strengthening the connection.

As shown in fig. 5, when the furnace 400 is connected with the burner 200, a sealing gasket 600 is used at the connection part between the two, so that the connection between the furnace 400 and the burner 200 maintains a certain air tightness.

In this example, as shown in FIG. 5, the chamber 403 of the furnace 400 is an annular, closed cavity hollowed out in the wall of the furnace 400. It should be understood that the chamber 403 is configured according to the structure of the furnace 400 in this example, but the shape and configuration thereof is not limited solely by this application. When the hearth 400 is square, the chamber 403 may also be square; when the furnace 400 is polygonal, the chamber 403 may also be polygonal; meanwhile, in order to meet other special requirements, the chamber 403 may also be designed into a ring shape with a diameter decreasing from top to bottom in the direction of the arrow shown in fig. 5.

It should be understood that the configuration of the firebox 400 as shown in fig. 5 is intended to match the shape of the burner 200 as described above. The shape and configuration of the firebox 400 given in this example is not intended to be exclusive as such. The firebox 400 may also be configured in other shapes, such as a square, a truncated cone, etc.

In this example, water is used as the heat exchange medium because water has good fluidity and thermal conductivity. The present example is not intended to be limiting. In other embodiments, other materials such as oil may be used as the heat transfer medium.

In connection with the second aspect, in this example, a furnace feed pipe 401 and a furnace discharge pipe 402 are provided in the furnace wall in communication with the chamber.

The hearth feed pipe 401 and the hearth discharge pipe 402 are symmetrically arranged. In other examples, however, the furnace feed tube 401 and the furnace discharge tube 402 are not symmetrically disposed, such as 90 apart, 120 apart, and so forth.

In other extreme examples, the furnace feed pipe 401 and the furnace discharge pipe 402 may be the same pipe. This is an installation mode in which flame combustion can be completed in a short time. The heat exchange medium can not generate huge temperature difference in the short time, namely, the internal temperature of the hearth 400 can not change greatly in the short time, and the decisive influence on the experimental result can not be generated.

As shown in fig. 5 and 8, a mixing baffle 1100 is provided in the second gas flow path. The mixing partition 1100 is configured in a disk shape. A plurality of through slots 1101 are provided on the hybrid spacer 1100. A plurality of air holes 1102 are provided in each through slot 1101.

In this example, in the process of flowing the air flow to the first air flow channel through the second air flow channel, the air flow passes through the mixing partition 1100, the through groove 1101 is formed on the mixing partition 1100, and the air hole 1102 is formed in the through groove 1101, so that the air flow forms a stable flow state after passing through the mixing partition 1100. In the case of using the mixed combustible gas as the combustion gas, the mixing partition 1100 can achieve a uniform mixed state of the mixed gas flow.

It should be appreciated that the hybrid baffle 1100 is configured as shown in fig. 5 or fig. 8 to match the shape of the furnace 400 as described above. The shape and configuration of the hybrid septum 1100 presented in this example is not intended to be limited solely by this example. Hybrid septum 1100 may also be configured in other shapes, such as square, frustoconical configurations, and the like.

In connection with the second aspect, as shown in fig. 2, 3 and 5, the flame furnace of the present example further includes a heat-insulating housing 300. The thermal insulation case 300 is constructed in a hollow cylindrical structure. The heat preservation shell 300 is sleeved outside the hearth 400. The mode that combines to let in the heat transfer medium in the chamber in order to reach furnace 400 can reach better isolated external environment, prevents that external environment from to the inside influence of furnace.

It should be understood that the configuration of the insulating shell 300 as shown in fig. 2, 3 and 5 is designed to match the shape of the firebox 400 described above. The shape and configuration of the insulated housing 300 given in this example is not intended to be limiting solely to this example. The heat insulating housing 300 may be formed in other shapes, such as a square shape, a circular truncated cone shape, and the like.

In connection with the second aspect, as shown in fig. 2 and 7, the flame furnace of the present application is further provided with a furnace cover 100. The cap 100 is used to seal the burner 200 so that the burner is not exposed to air when the flame burner is not in use.

As shown in fig. 5, the bottom of the flame furnace of this example is provided with a connection flange 500. The flame burner of the present example is enabled by the attachment flange 500 to be easily mounted and dismounted from any platform.

In a third aspect, as shown in fig. 1, the embodiments of the present application provide a heat flow laboratory bench system for measuring the flame burning speed of combustible gas and observing the flame burning phenomenon. The experiment table system comprises the flame furnace, the gas supply device 1300, the heat exchange medium supply device 1200 and the measurement and control device 1400.

Wherein the gas supply device 1300 is connected to the gas inlet pipe 700 shown in fig. 5 in the furnace 400. And supplying a combustible gas to the flame furnace through the second gas flow passage.

As shown in fig. 1, the gas supply device 1300 includes a combustible gas branch, a nitrogen branch, and an exhaust branch. The three branches finally merge into one branch, and then the mixed gas is introduced into the flame furnace through the gas inlet pipe 700 as shown in fig. 5. In this example, the combustible gas branch includes a methane branch and an air branch.

In the methane branch, a methane gas cylinder 1310 is used as a gas supply source for methane, a methane cylinder top valve 1311 of the methane gas cylinder 1310 is used as a gas source opening valve, and then the pressure of the methane gas cylinder 1310 is reduced to the pressure required by work through a methane gas cylinder reducing valve 1312 for gas source supply. The on-off of the whole methane branch is controlled by controlling the on-off of the methane ball valve 1313 by the methane gas. A flame arrestor 1314 is also provided in the branch after the methane ball valve 1313. A methane mass flow meter 1315 is also provided after the flame arrestor 1314, and the methane mass flow meter 1315 is used to control the flow rate of methane gas in the branch.

After the methane branch passes through the open methane cylinder top valve 1311, the methane gas is released from the methane cylinder 1310, and the pressure of the methane gas is reduced to the required working pressure by the methane cylinder pressure reducing valve 1312. And then through the control of a methane ball valve 1313 to determine whether methane gas enters the flame furnace. While the flow rate of methane gas in the branch can be adjusted by the methane mass flow meter 1315.

It is noted that the methane gas, after opening through the methane ball valve 1313, enters the flame arrestor 1314 and then enters the methane mass flow meter 1315. The flame arrester is arranged mainly for the consideration of equipment safety design, and the occurrence of special conditions such as backfire and the like is prevented.

In this example, the methane mass flow meter 1315 is controlled by the measurement and control device 1400. In other examples, the methane mass flow meter 1315 may also be manually controlled.

In this example, the methane mass flow meter 1315 accurately controls the flow rate of methane entering the flame furnace from the methane gas according to the control instruction of the measurement and control device, thereby controlling the content of methane in the combustion mixture gas.

In the air branch, air is supplied by an air compressor 1330 as an air source, and the on-off of the air branch is controlled by an air ball valve 1331. The air is then filtered through an air filter 1332 to the cleanliness required by the system. The filtered clean compressed air is decompressed by a compressed air decompression valve 1333 and enters an air mass flow meter 1334. Finally, the flow of air entering the flame furnace is controlled by an air mass flow meter 1334.

In this example, the air mass flow meter 1334 is controlled by the measurement and control device 1400. In other examples, air mass flow meter 1334 may also be manually controlled.

In this example, the air mass flow meter 1334 precisely controls the air flow rate of the air branch into the flame furnace according to the control instruction of the measurement and control device, so as to control the air content in the combustion mixture gas.

Then, in the nitrogen branch, the nitrogen gas uses a nitrogen gas cylinder 1320 as a gas supply source, and opens the valve by using a nitrogen gas cylinder top valve 1321 as a gas source, and then the pressure of the nitrogen gas is reduced to the pressure required by the operation by a nitrogen gas reducing valve 1322 to supply the gas source. The nitrogen branch controls the on-off of the whole nitrogen branch by controlling the on-off of the nitrogen ball valve 1323. A nitrogen mass flow meter 1324 is also provided on the nitrogen branch after the nitrogen ball valve 1323, and the nitrogen mass flow meter 1324 is used for controlling the flow rate of nitrogen in the branch.

After the nitrogen branch passes through the opened nitrogen cylinder top valve 1321, nitrogen is released from the nitrogen cylinder 1320, and the pressure of the nitrogen is reduced to a desired working pressure through the nitrogen pressure reducing valve 1322. The nitrogen gas is then controlled by a nitrogen ball valve 1323 to determine whether the nitrogen gas enters the flamed furnace. While the flow of nitrogen in the branch can be regulated by a nitrogen mass flow meter 1324.

In this example, the nitrogen mass flow meter 1324 is controlled by the measurement and control device 1400. In other examples, nitrogen mass flow meter 1324 may also be manually controlled.

In this example, the nitrogen mass flow meter 1324 precisely controls the flow rate of nitrogen gas entering the flame furnace according to the control instruction of the measurement and control device, thereby controlling the content of nitrogen gas in the combustion mixture gas.

As shown in fig. 1, in this example, the exhaust branch includes an exhaust duct, and the exhaust duct communicates with the methane branch and the nitrogen branch, respectively. Wherein, a nitrogen gas emptying valve 1340 is arranged on the pipeline connecting the exhaust pipeline and the nitrogen gas branch, and an emptying main valve 1341 is arranged on the main pipeline of the exhaust pipeline.

When the test is finished, firstly closing a methane cylinder top valve 1311, a nitrogen cylinder top valve 1321, a methane ball valve 1313, a nitrogen ball valve 1323 and a nitrogen evacuation valve 1340 of the methane cylinder 1310, and opening an evacuation main valve 1341 to evacuate residual methane gas in a methane branch; then, opening a top valve 1321 of a nitrogen cylinder and a nitrogen emptying valve 1340 to perform nitrogen flushing on the emptying pipeline so as to ensure that no residual methane gas exists in the emptying pipeline and ensure the safety of the test; after the purge is complete, the nitrogen cylinder top valve 1321, nitrogen purge valve 1340, and purge main valve 1341 are closed.

In this example, a mixed gas of methane gas, air and nitrogen gas is used as the combustible gas. It should be understood that the combustible gas is not limited to the present application, and may be a mixture of other gases.

In this example, a methane filter 1316 and a nitrogen filter may be disposed in the methane branch and the nitrogen branch after the stop valve of each branch to ensure the purity of methane gas and nitrogen gas. And the filter is a 20um filter.

In this example, pressure gauges may be further provided in the methane branch and the nitrogen branch before and after the pressure reducing valve of each branch to measure and display the pressures of methane and nitrogen before and after pressure reduction. The measuring range of the pressure gauge positioned in front of the pressure reducing valve is 0-25MPa, and the measuring range of the pressure gauge positioned behind the pressure reducing valve is 0-0.6 MPa.

In this example, the cylinder pressures of the methane cylinder 1310 and the nitrogen cylinder 1320 are 0-15 MPa.

In this example, an air pressure gauge is further provided in the air branch after the compressed air pressure reducing valve 1333. And the pressure measuring range of the air pressure gauge is 0.05-0.7 MPa.

In this example, the pressure ranges of the methane mass flow meter 1315, the nitrogen mass flow meter 1324, and the air mass flow meter 1334 are 0.1-0.35 MPa.

With reference to the third aspect, as shown in fig. 1, in the present example, the heat exchange medium supply device connected to the flame furnace is a water bath heating pan. In this example, two water bath heating pans are used to provide heated water to the cavity and the chamber, respectively, to maintain a constant temperature in the first and second airflow channels or to vary the temperature of the first and second airflow channels. In this example, the water bath has a heating device and a temperature sensor. The heating device is connected with the measurement and control device and is controlled by the measurement and control device, and the temperature sensor is also connected with the measurement and control device, and the measurement and control device can collect the temperature of the temperature sensor and display the temperature in real time.

When the first airflow channel and the second airflow channel are kept at constant temperature, the water bath kettle needs to be adjusted to be in a constant temperature mode, and water in the water bath kettle is continuously pumped into the cavity and the cavity, so that the temperature of the water is not changed violently. The measurement and control device can control the temperature of the heat exchange medium provided by the heat exchange medium providing device.

In other examples, the water bath may also be manually set with a thermostatic control.

With reference to the third aspect, in this example, the measurement and control device is configured to control the flame furnace to operate in different combustion modes, and simultaneously perform measurement and recording of the combustion temperature of the flame and display the combustion temperature in real time.

In this example, the combustion mode is determined by one or more factors of the temperature of the heat exchange medium, the gas flow rate, and the composition of the combustible gas.

The combustible gas composition and gas flow rate are realized by controlling the methane mass flow meter 1315, the air mass flow meter 1334 and the nitrogen mass flow meter 1324 by the measurement and control device so as to change the ratio of methane, air and nitrogen in the mixed gas.

The temperature of the heat exchange medium is realized by controlling the temperature of the water bath by the measurement and control device 1400.

In this example, the measurement and control device 1400 at least needs to satisfy the following requirements:

and (3) process control: completing the control of the test process according to preset parameters;

and (3) parameter measurement: in the test process, test data (temperature and flow) are collected and displayed and stored in real time;

data processing: test data was processed after the test.

The measurement and control device can adopt a test technical scheme with mature technology, and mainly comprises the following components:

a main control computer: the measurement and control system software is arranged in the device;

automatic measurement and control assembly: a temperature recorder and a mass flow controller;

other control components: a water bath kettle;

signal cable: measurement cables, control cables, power lines, etc.;

an operation table: installing an industrial personal computer, a display, a keyboard and a mouse, a finger control and the like;

the main control computer is used for completing a test data acquisition task, storing data in real time, displaying a real-time data curve and processing data after the fact; and controlling the mass flow controller to complete the test control task.

The temperature recorder is used for recording the temperature of the thermocouples arranged on the combustion net at different radiuses.

The function of the mass flow controller is to control the gas flow according to the flow parameters set by actual needs. (in this example, the mass flow controllers correspond to the methane mass flow meter 1315, air mass flow meter 1334, and nitrogen mass flow meter 1324, respectively), the mass flow controllers also retain some adjustable margin.

The water bath may be used for heating and cooling, in this example, high temperature circulating hot water may be fed into the cavity to provide a stable temperature at the edge of the combustion net; meanwhile, circulating water with normal temperature or lower temperature can be introduced into the chamber, so that the gas entering the second gas flow channel keeps constant temperature; it should be understood that the temperature of the circulating water introduced into the cavity and the chamber through the water bath is adjusted according to actual needs, and the temperature of the circulating water can be the same or different.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.