阅读说明：本技术 一种基于连通器的液面稳定伴流燃烧实验装置 (Liquid level stabilization wake flow combustion experimental device based on communicating vessels ) 是由 王强 涂煜 史明立 汪绍明 唐飞 石琴 于 2019-10-18 设计创作，主要内容包括：本发明提供一种基于连通器的液面稳定伴流燃烧实验装置,该实验装置包括燃油补给部分、燃烧器部分、称重部分以及数据采集部分。通过燃油补给部分控制油池的液面高度,并且此高度在一定范围内连续可调,实现对不同稳定液面高度情况下的油池火燃烧特性及燃烧速率的研究；燃烧器部分可以实现油池火在不同的伴流速度、不同的气氛和不同的液面高度下的燃烧行为研究；称重部分用于测量燃烧过程中的燃油减少量；数据采集部分将采集实验数据,用于油池火燃烧行为的分析和研究。本发明提供了一种基于连通器的液面稳定伴流燃烧实验装置,可用于研究不同液面高度油池火稳定燃烧状态下的行为特征,对油类火灾防控技术的开发具有重要意义。(The invention provides a liquid level stable wake flow combustion experimental device based on a communicating vessel. The liquid level of the oil pool is controlled by the fuel supply part, and the height is continuously adjustable in a certain range, so that the research on the combustion characteristics and the combustion rate of the oil pool under the conditions of different stable liquid level heights is realized; the combustor part can realize the combustion behavior research of the oil pool fire under different wake flow speeds, different atmospheres and different liquid level heights; the weighing part is used for measuring the fuel reduction amount in the combustion process; the data acquisition part is used for acquiring experimental data for analyzing and researching the combustion behavior of the oil pool fire. The invention provides a liquid level stable wake combustion experimental device based on a communicating vessel, which can be used for researching the behavior characteristics of oil pool fire in stable combustion states at different liquid level heights and has important significance for the development of oil fire prevention and control technology.)

1. The utility model provides a liquid level stabilizes wake flow burning experimental apparatus based on linker which characterized in that: including fuel supply part, combustor part, gas supply part, weighing part and data acquisition part, wherein:

the fuel supply part comprises a fuel storage box (2) at the upper layer of the iron stand (1) and a fuel supply box (3) at the lower layer, and the two are connected by two stainless steel pipes, namely a left stainless steel pipe (4) and a right stainless steel pipe (5); the upper fuel oil storage tank (2) positioned above is additionally provided with a funnel opening (6); before the experiment begins, fuel is filled through the funnel opening (6), and the funnel opening (6) is plugged by a rubber plug in the experiment process, so that the upper layer fuel oil storage tank (2) is kept closed; in the experimental process, when the fuel in the lower fuel supply tank (3) is reduced to the state that the lower port of the left stainless steel pipe (4) is exposed to the oil surface, the fuel in the upper fuel storage tank (2) flows into the lower fuel supply tank (3) through the right stainless steel pipe (5), so that the fuel is supplied to an oil pool (8) through a stainless steel hose (7), and the liquid level height between the oil pool (8) and the lower fuel supply tank (3) is approximately kept consistent; the lifting platform (9) can control the whole iron frame (1) to ascend and descend so as to realize fuel oil level control of the lower fuel oil supply tank (3), further change the liquid level height of the oil pool (8), and the height can be continuously adjusted in a certain range, so that the research on the combustion characteristics and the combustion rate of the oil pool under the condition of different stable liquid level heights is realized; in addition, in the fuel combustion and supply process, the supply rate of fuel flowing into the lower fuel supply tank (3) from the upper fuel storage tank (2) is required to be slightly greater than the combustion rate of the fuel in the oil pool (8) until the lower port of the stainless steel pipe (4) is immersed below the oil level, and the test is stopped, so that the stable combustion state can be achieved and the test can be continued for a long time; a fuel on-off valve (10) for controlling the on-off of the fuel is arranged in the middle of a stainless steel hose (7) communicated between the oil pool (8) and the fuel supply tank (3) to control the on-off of the fuel at any time;

the weighing part is used for measuring the fuel reduction amount of the fuel storage tank in the experimental combustion process, and mainly comprises an electronic balance (11) on the upper layer of the iron frame (1);

the burner part comprises an oil pool (8), a wake ring (12), a stainless steel hose (7) connecting the oil pool (8) and a lower fuel supply tank (3), a rectifying honeycomb (13) and a non-sealed mesh (14) above the wake ring;

the gas supply device part comprises N₂And O₂A steel cylinder (15), a pressure reducing valve (16), a mass flow meter (17) and a mixing chamber (18); the whole device provides mixed gas for the wake ring (12) to support combustion; the on-off of the gas is controlled by a gas on-off valve (19);

the data acquisition part comprises a digital video camera (20), an R-type thermocouple (21), a 7018 data acquisition module (22) and a data acquisition computer (23); the digital camera (20) is used for shooting the phenomenon of the whole combustion process, the R-shaped thermocouple is used for measuring the flame temperature, and the data acquisition computer (23) is used for acquiring real-time temperature data and mass loss data of the electronic balance (11).

2. The liquid level stabilization wake flow combustion experimental device based on the communicating vessels as claimed in claim 1, wherein: the fuel supply part is communicated with the burner part through a stainless steel hose (7), so that the liquid level of the oil pool (8) is always kept the same as the liquid level of the lower fuel supply tank (3); meanwhile, a fuel on-off valve (10) for controlling the on-off of fuel inside the pipeline is arranged in the middle of the pipeline, and the on-off of the fuel is controlled at any time.

3. The liquid level stabilization wake flow combustion experimental device based on the communicating vessels as claimed in claim 1, wherein: the fuel supply section requires only two fuel storage tanks.

4. The liquid level stabilization wake flow combustion experimental device based on the communicating vessels as claimed in claim 1, wherein: but electronic balance (11) high accuracy real-time measurement oil bath (8) flame quality of fuel loss when stabilizing the combustion state, the quality of stabilizing the burning stage fuel storage box reduces the speed promptly the burning rate of oil bath, has solved the unstable problem that leads to of ration oil bath liquid level can't accurately measure the burning rate of the abundant development period of oil bath fire.

5. The apparatus of claim 1 for experiment of steady-state combustion of liquid level with accompanying current based on communicating vesselsThe method is characterized in that: the gas supply device can change the wake flow gas N₂And O₂The oil pool fire combustion behavior under the action of different wake flow speeds and atmospheres is researched.

6. The apparatus for liquid level stable wake combustion experiment based on the communicating vessels as claimed in claim 5, wherein: a filter screen and a honeycomb pipeline (13) are arranged in the flow accompanying ring (12) in the gas supply device, the gas supply device has the functions of efficient filtering and purifying and airflow stabilizing on passing mixed gas, and a non-sealed net (14) is arranged above the flow accompanying ring, so that pollutants such as carbon smoke particles generated by combustion can be effectively filtered, and the environmental pollution is reduced.

Technical Field

The invention belongs to the technical field of combustion science and fire safety science, and particularly relates to an experimental device for continuously and stably researching fire behavior characteristics of an oil pool based on a liquid level of a communicating vessel.

Background

In the technical fields of combustion science and fire safety, the combustion behavior of oil pool fire is always an important research content, the oil pool fire is generally rapidly developed and easily forms explosive fire, the fire extinguishing difficulty is high, the re-combustion phenomenon is common, and the caused harm forces people to deeply research the combustion characteristics, the combustion phenomenon and other problems of the oil pool fire.

For the combustion behavior of oil pool fire, many related researches have been carried out at home and abroad. Where the burning rate is considered as an important parameter for scientific research on fire and analysis of risk of fire, the change of burning rate with time is one of the essential characteristics of the process of fire occurrence, and the burning rate also determines the rate of heat release from fire. Typically, the burn rate is experimentally measured and studies have shown that the burn rate of fuel increases with increasing pool size, i.e. the pool area determines the burn rate. In practice, the depth of the fuel bed also has a significant effect on the rate of combustion. After the oil pool fire combustion starts, the liquid surface temperature rapidly rises and reaches the boiling point, at the moment, the high-temperature fuel layer gradually transfers heat to the lower-temperature fuel layer, and along with the combustion, a temperature gradient is formed in the depth direction in the fuel layer. For an oil pool with a fixed fuel amount, the fuel depth can gradually decrease in the later combustion period, so that the fuel temperature is continuously increased. On the other hand, after the fuel liquid level is lowered, the flame is directly exposed inside the oil pool, so that the temperature of the whole oil pool is increased, the evaporation of the fuel is accelerated, and certain influence is caused on the combustion stability.

Therefore, the method has important significance for researching the burning behavior and burning rate of the oil pool under the stable burning state by maintaining the liquid level height of the oil pool. The invention provides a liquid level stable wake combustion experimental device based on a communicating vessel, which can not only continuously supplement fuel to a burning oil pool to continuously maintain the liquid level height to be stable and unchanged, but also accurately monitor and record the combustion rate of oil pool fire in the experiment in real time by a method for measuring the quality of a fuel oil storage tank.

Disclosure of Invention

In order to develop the research on the influence of the fuel bed depth on the combustion behavior of the oil pool fire, the invention provides a liquid level stable wake flow combustion experimental device based on a communicating vessel, wherein the liquid level height of an oil pool can be freely regulated and controlled, and the liquid level stable wake flow combustion experimental device is used for researching the combustion characteristics and rules of the oil pool fire during stable combustion and measuring the combustion rate of the oil pool fire under different fuel bed depth conditions in real time.

The technical scheme for realizing the purpose is as follows: the utility model provides a liquid level stabilizes wake flow burning experimental apparatus based on linker, includes fuel supply part, combustor part, gas supply part, weighing part and data acquisition part, wherein:

the fuel supply part comprises a fuel storage box at the upper layer of the iron stand and a fuel supply box at the lower layer of the iron stand, and the fuel storage box and the fuel supply box are connected by two stainless steel pipes, namely a left stainless steel pipe and a right stainless steel pipe; the upper fuel oil storage tank positioned above is additionally provided with a funnel opening; before the experiment is started, fuel is filled through the funnel opening, and the funnel opening is plugged by a rubber plug in the experiment process, so that the upper-layer fuel storage tank is kept closed; in the experimental process, when the fuel in the lower fuel supply tank is reduced to the state that the lower port of the left stainless steel pipe exposes out of the fuel surface, the fuel in the upper fuel storage tank flows into the lower fuel supply tank through the right stainless steel pipe, so that the fuel is supplied to the oil pool through the stainless steel hose, and the liquid level height between the oil pool and the lower fuel supply tank is approximately kept consistent; the lifting platform can control the whole iron stand to ascend and descend so as to realize the fuel level control of the lower fuel supply tank and further change the liquid level height of the oil pool, and the height can be continuously adjusted in a certain range, so that the research on the combustion characteristics and the combustion rate of the oil pool under the condition of different stable liquid level heights is realized; in addition, in the fuel combustion and supply process, the supply rate of the fuel flowing into the lower fuel supply tank from the upper fuel storage tank is required to be slightly greater than the combustion rate of the fuel in the fuel pool until the lower port of the stainless steel pipe is immersed below the oil level, so that the experiment can be ensured to reach a stable combustion state and continue to be carried out for a long time; a fuel on-off valve for controlling the on-off of the fuel is arranged in the middle of a stainless steel hose communicated between the oil pool and the fuel supply tank, so that the on-off of the fuel is controlled at any time;

the weighing part is used for measuring the fuel reduction amount of the fuel storage tank in the experimental combustion process, and mainly comprises an electronic balance on the upper layer of an iron stand;

the combustor part comprises an oil pool, a flow accompanying ring, a stainless steel hose connecting the oil pool and a lower fuel supply tank, a rectifying honeycomb and a non-sealed mesh above the flow accompanying ring;

the gas supply device part comprises N₂And O₂A steel cylinder, a pressure reducing valve, a mass flow meter and a mixing chamber; the whole device provides mixed gas for the wake flow ring to support combustion; the on-off of the gas is controlled by a gas on-off valve;

the data acquisition part comprises a digital camera, an R-type thermocouple, a 7018 data acquisition module and a data acquisition computer; the digital camera is used for shooting the phenomenon of the whole combustion process, the R-type thermocouple is used for measuring the flame temperature, and the data acquisition computer is used for acquiring real-time temperature data and mass loss data of the electronic balance.

The fuel supply part is communicated with the burner part through a stainless steel hose, so that the liquid level of the oil pool is always kept the same as the liquid level of the lower fuel supply tank; meanwhile, a fuel on-off valve for controlling on-off of fuel inside the pipeline is arranged in the middle of the pipeline, and on-off of the fuel is controlled at any time.

The fuel supply section requires only two fuel storage tanks.

The electronic balance can measure the fuel loss quality of the oil pool in a stable combustion state of flame in real time with high precision, the mass reduction rate of the fuel storage tank in a stable combustion stage is the combustion rate of the oil pool, and the problem that the combustion rate of the oil pool in a full development period of fire cannot be accurately measured due to the fact that the liquid level of the quantitative oil pool is unstable is solved.

The gas supply means may be modifiedFlowing gas N₂And O₂The oil pool fire combustion behavior under the action of different wake flow speeds and atmospheres is researched.

The gas supply device is characterized in that the flow accompanying ring is internally provided with the filter screen and the honeycomb pipeline, the gas supply device has the functions of efficiently filtering and purifying passing mixed gas and stabilizing air flow, and the non-sealed net is arranged above the flow accompanying ring, so that pollutants such as carbon smoke particles and the like generated by combustion can be effectively filtered, and the environmental pollution is reduced.

The advantages and beneficial technical effects of the invention are embodied in the following aspects:

1. the invention provides a liquid level stable wake combustion experimental device based on a communicating vessel, which solves the problems that the fuel temperature is continuously increased and the wall heat loss is continuously increased due to the fact that the liquid level of an oil pool is gradually reduced along with the combustion, and simultaneously can solve the problem that the combustion rate of the oil pool in the full development period of the fire cannot be accurately measured due to the fact that the liquid level of a quantitative oil pool is unstable;

2. in the aspect of the liquid level height adjustment of the oil pool, the oil pool and the lower fuel supply tank are communicated through a U-shaped stainless steel hose, so that the liquid level height of the oil pool is always consistent with the liquid level height of the fuel supply tank, and the working mode is as follows: when the fuel oil in the oil pool is reduced, the fuel oil in the fuel oil supply tank is reduced, when the stainless steel pipe on the left side in the fuel oil supply tank is exposed out of the surface of the fuel oil, the fuel oil in the fuel oil storage tank flows into the supply tank through the stainless steel pipe on the right side, the supply rate is slightly greater than the combustion rate until the liquid level of the fuel oil in the fuel oil supply tank submerges the bottom end of the stainless steel pipe on the left side, and the fuel oil supply process is stopped;

3. in the aspect of influence of fuel oil depth, the whole iron stand can be controlled to ascend and descend by adjusting the height of the lifting platform, so that the fuel oil level of the fuel oil supply tank is controlled, the liquid level height of the oil pool is changed, the height can be continuously adjusted within a certain range, and the research on the combustion characteristics and the combustion rate of the oil pool under the conditions of different stable liquid level heights is realized;

4. in the aspect of measuring the combustion rate, because the experiment requires that the liquid level of the oil pool is kept constant and the fuel is stably and continuously combusted all the time, the electronic balance measures the mass of the fuel storage tank, the reduction rate of the mass of the fuel storage tank in the stable combustion stage is the combustion rate of the oil pool fire experiment, the error of measured data is small, and the precision is high.

Drawings

FIG. 1 is a schematic diagram of a liquid level stabilization wake flow combustion experimental device based on a communicating vessel;

FIG. 2 is a schematic illustration of the refueling arrangement of the present invention;

FIG. 3 is a schematic view of the connection structure of the U-shaped stainless steel hose between the refueling part and the oil pool according to the present invention;

the reference numbers in the figures mean: 1 is an iron stand; 2 is an upper layer fuel oil storage tank; 3 is a lower fuel supply tank; 4 is a left stainless steel tube; 5 is a stainless steel tube on the right side; 6 is a funnel mouth; 7 is a stainless steel hose; 8 is an oil pool; 9 is a lifting platform; 10 is a fuel on-off valve; 11 is an electronic balance; 12 is an adjoint flow ring; 13 is a rectifying honeycomb; 14 is a non-sealing mesh over the wake ring; 15 is N₂And O₂A steel cylinder; 16 is a pressure reducing valve; 17 is a mass flow meter; 18 is a mixing chamber; 19 is a gas on-off valve; 20 is a digital video camera; 21 is an R-type thermocouple; 7018 is a data acquisition module; and 23, a data acquisition computer.

Detailed Description

The specific embodiment of the invention is as follows with reference to the attached drawings:

referring to fig. 1, the liquid level stabilization wake flow combustion experimental device based on the communicating vessels comprises a fuel supply part, a burner part, a gas supply part, a weighing part and a data acquisition part.

The fuel supply part consists of an upper fuel storage tank 2 and a lower fuel supply tank 3 of the iron stand 1, which are connected by two stainless steel pipes, namely a left stainless steel pipe 4 and a right stainless steel pipe 5; the fuel oil storage tank 2 on the upper layer is additionally provided with a funnel opening 6, fuel is filled through the funnel opening 6 before the experiment begins, and the funnel opening 6 is plugged by a rubber plug in the experiment process, so that the fuel oil storage tank 2 on the upper layer is kept closed; in the experimental process, when the fuel in the lower fuel supply tank 3 is reduced to the state that the lower port of the left stainless steel pipe 4 is exposed out of the oil surface, the fuel in the upper fuel storage tank 2 flows into the lower fuel supply tank 3 through the right stainless steel pipe 5, so that the fuel is supplied to the oil pool 8 through the stainless steel hose 7, the liquid level height between the oil pool 8 and the lower fuel supply tank 3 is always consistent, the lifting platform 9 can control the whole iron frame 1 to ascend and descend, the fuel level control of the lower fuel supply tank 3 is realized, the liquid level height of the oil pool 8 is changed, the height can be continuously adjusted within a certain range, and the research on the combustion characteristics and the combustion rate of the oil pool under the condition of different stable liquid level heights is realized; in addition, in the fuel combustion and supply process, the supply rate of the fuel flowing into the lower fuel supply tank 3 from the upper fuel storage tank 2 is required to be slightly larger than the combustion rate of the fuel in the oil pool 8 until the lower port of the stainless steel pipe 4 is immersed below the oil level, so that the experiment can be ensured to reach a stable combustion state and continue for a long time; a fuel on-off valve 10 for controlling the on-off of the fuel is arranged in the middle of the stainless steel hose 7 which is communicated between the fuel pool 8 and the lower fuel supply tank 3, and the on-off of the fuel is controlled at any time.

The weighing part is used for measuring the fuel reduction amount of the fuel storage tank in the experimental combustion process, and mainly comprises an electronic balance 11 on the upper layer of an iron frame 1 and an upper fuel storage tank 2 arranged on the electronic balance 11, wherein the measuring range and the precision of the electronic balance 11 need to meet the requirement of experimental data processing, and the internal structural design of the iron frame 1 needs to be enough for placing a corresponding experimental device;

the burner part comprises an oil pool 8, a half-flow ring 12, a stainless steel hose 7 connecting the oil pool 8 and the lower fuel supply tank 3, a rectifying honeycomb 13 and a non-sealing net 14 above the wake ring;

the gas supply device part comprises N₂And O₂A cylinder 15, a pressure reducing valve 16, a mass flow meter 17 and a mixing chamber 18; the whole device provides mixed gas for the flow-accompanying ring 12 to support combustion; the on-off of the gas is controlled by a gas on-off valve 19;

the data acquisition part comprises a digital camera 20, an R-type thermocouple 21, a 7018 data acquisition module 22 and a data acquisition computer 23; the digital camera 20 is used for shooting the phenomenon of the whole combustion process, the R-type thermocouple 21 is used for measuring the flame temperature, the data acquisition computer 23 is used for acquiring real-time temperature data and mass loss data of the electronic balance 11, and finally the combustion characteristic of the oil pool fire is obtained through analysis.

Referring to fig. 2, the fuel supply part is a simple and compact communication device, which comprises an upper fuel storage tank 2 and a lower fuel supply tank 3 which are connected by stainless steel pipes 4 and 5, a funnel opening 6 is additionally arranged on the upper fuel storage tank 2, so that fuel can be conveniently filled, and the funnel opening 6 is plugged by a rubber plug in the experimental process, so that the upper fuel storage tank 2 is kept closed; the material design and the size of the stainless steel tubes 4 and 5 should meet the experimental requirements according to the experimental characteristics. After the experiment is started, the fuel in the lower fuel supply tank 3 gradually decreases, and when the fuel in the lower fuel supply tank 3 decreases to the extent that the lower port of the left stainless steel tube 4 exposes the fuel, the fuel in the upper fuel storage tank 2 flows into the lower fuel supply tank 3 through the right stainless steel tube 5. For the experiment to continue to run steadily, the fueling rate is required to be slightly greater than the burn rate.

Referring to fig. 3, the stainless steel hose 7 connecting the oil pool 8 and the lower fuel supply tank 3 is a U-shaped stainless steel hose communication structure, so that the liquid level of the oil pool 8 is always kept the same as the liquid level of the lower fuel supply tank 3, and the height of the lower fuel supply tank 3 determines the liquid level of the oil pool 8, which can be adjusted within a certain range according to experimental requirements. Wherein, a fuel on-off valve 10 is arranged in the middle of the stainless steel hose 7 and is used for controlling the on-off of the internal fuel; the rectification honeycomb 13 comprises a filter screen and a honeycomb pipeline, and has the functions of high-efficiency filtration and purification and airflow stabilization for gas.

The above description is for the purpose of simplifying the embodiments of the present invention, and is only illustrative of the related art, but not intended to limit the scope thereof, and all changes and modifications that can be made by one of ordinary skill in the art in light of the above disclosure will fall within the scope of the appended claims.