CN114323904B - Gas preheating and additive vaporizing device for combustible gas combustion experiment - Google Patents
Gas preheating and additive vaporizing device for combustible gas combustion experiment Download PDFInfo
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- CN114323904B CN114323904B CN202111579892.1A CN202111579892A CN114323904B CN 114323904 B CN114323904 B CN 114323904B CN 202111579892 A CN202111579892 A CN 202111579892A CN 114323904 B CN114323904 B CN 114323904B
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Abstract
The invention discloses a gas preheating and additive vaporizing device for a combustible gas combustion experiment, which comprises a heat preservation barrel, a heat preservation barrel cover, a liquid cavity, a coil pipe, an air inlet pipe, a liquid discharge pipe, an exhaust pipe, a safety valve, a heat preservation pipe, a vacuum pump, an explosion-proof electric heating belt, an insulating heat preservation material, a flow controller, a thermocouple, a pressure transmitter, a liquid level meter, a control cabinet and a valve. The liquid chamber is arranged in the heat-preserving barrel, the coil pipe is arranged between the heat-preserving barrel and the liquid chamber, the explosion-proof electric heating belt is wound outside the liquid chamber and the coil pipe, insulating heat-preserving materials are filled among the heat-preserving barrel, the liquid chamber and the coil pipe, liquid additives are placed in the liquid chamber, gas circulates in the coil pipe, the glass tube type liquid level meter is arranged on the liquid chamber, and the steam pressure in the liquid chamber, the gas temperature in the coil pipe and the flow are controlled by the control cabinet. The invention has the functions of uniform preheating of gas, rapid vaporization of additive, high-efficiency quantitative control of the temperature, flow rate and component concentration of mixed gas, and the like, and has compact structure, high safety and easy popularization and application.
Description
Technical Field
The invention belongs to the technical field of gas preheating and liquid vaporization, and particularly relates to a gas preheating and additive vaporization device for a combustible gas combustion experiment, which has the functions of uniform gas preheating, rapid additive vaporization, efficient quantitative control of the temperature, flow rate and component concentration of mixed gas and the like.
Background
The addition of the combustion improver improves the combustion performance of the fuel gas, is an effective way for improving the utilization efficiency of the fuel gas and reducing the emission of harmful gases, but the liquid combustion improver can efficiently play a role in the gas combustion process after being gasified. On the other hand, the application of the clean combustible gas brings convenience and also has the risk of gas leakage, so that fire and even explosion accidents can be possibly induced, and serious life and property loss is caused. The flame retardant has remarkable flame inhibition effect, but the high-efficiency flame retardant (such as perfluoroethanone, water and the like) commonly used at present mainly exists in a liquid form at normal temperature and normal pressure, and can more effectively play a flame retardant effect only after the flame retardant is vaporized. The liquid additive body vaporizing device used for the gas combustion experiment at present can meet the requirement of liquid vaporization, but still has a plurality of defects, such as: the steam flow cannot be flexibly regulated and controlled, and the quantitative addition of the additive is not facilitated; the heating cavity is not provided with a safety valve, so that the pressure cannot be released in time when the air pressure is too high, and the safety is poor; the temperature of the liquid additive cannot be known in real time, so that the heating power is difficult to flexibly and automatically regulate and control.
In the research process of gas combustion experiments, if vaporized liquid additives are converged into a liquid state after being converged into normal-temperature air flow, the liquid additives are difficult to enter a combustion area along with the air flow, so that normal functions cannot be normally exerted, and if the liquid additives exist in a pipeline, gas flow measurement and control can be influenced, and even equipment is damaged. It is therefore necessary to preheat the gas stream to the desired temperature, avoid condensation of the additive vapors, and to flexibly vary the preheat temperature depending on the nature of the additive. On the other hand, the combustible mixed gas is preheated, so that the combustion efficiency, flame stability and temperature uniformity are improved, and the problem that the combustible gas (such as ammonia gas and the like) is difficult to ignite can be effectively solved; in addition, by preheating the air, the flame temperature can be increased and NO can be reduced X And the emission of pollutants. However, the existing gas preheating device for the combustible gas combustion experiment can achieve the aim of preheating gas, but has a plurality of defects, such as short preheating distance, which is unfavorable for quickly, stably and uniformly preheating gas, thereby influencing the preheating effect; the preheating airflow is difficult to quantitatively obtain due to the lack of a flow speed and flow regulating device; the temperature measuring point is only positioned in the heating cavity, and the temperature change caused by heat loss in the process of transferring the preheating airflow to the reaction zone is uncertain, so that the experimental result can be influenced.
The invention comprises the following steps:
the invention provides a gas preheating and additive vaporizing device for a combustible gas combustion experiment, which has the functions of uniform preheating of gas, rapid vaporization of additives, high-efficiency quantitative control of the temperature, the flow rate and the component concentration of mixed gas and the like, and is compact in structure, high in safety and easy to popularize and apply.
The invention overcomes the defects in the prior art, and provides the gas preheating and additive vaporizing device for the combustible gas combustion experiment, which has the functions of uniform preheating of gas, rapid vaporization of additive, efficient quantitative control of the temperature, flow rate and component concentration of mixed gas, and the like, and has the advantages of compact structure, high safety and easy popularization and application.
The technical scheme of the invention is as follows:
a gas preheating and additive vaporization device for combustible gas combustion experiments comprises a heat preservation barrel, a heat preservation barrel cover, a liquid cavity, a liquid inlet pipe, a liquid discharge pipe, a first coil pipe, a second coil pipe, a first air inlet pipe, a second air inlet pipe, a first heat preservation pipe, a second heat preservation pipe, a third heat preservation pipe, an exhaust pipe, a first flow controller, a second flow controller, a third flow controller, a first thermocouple, a second thermocouple, a third thermocouple, a fourth thermocouple, a pressure transmitter, a liquid level meter and a control cabinet.
The heat-preserving barrel cover covers the heat-preserving barrel. The liquid cavity is arranged in the heat-insulating barrel, the liquid cavity is communicated with the liquid level meter, a spiral groove is formed in the outer surface of the side wall of the liquid cavity, the liquid cavity explosion-proof electric heating belt is wound along the spiral groove, the top of the liquid cavity is connected with the liquid inlet pipe, the third heat-insulating pipe, the pressure relief pipe and the third thermocouple, and the bottom of the liquid cavity is connected with the liquid discharge pipe; the liquid inlet pipe is provided with a liquid inlet pipe valve and a pressure transmitter; the first coil pipe is of a spiral structure and is positioned between the heat-insulating barrel and the liquid cavity, the outer surface of the first coil pipe is wound with a first coil pipe explosion-proof electric heating belt, and the bottom and the top of the first coil pipe are respectively connected with a first air inlet pipe and a first heat-insulating pipe; the second coil pipe is of a spiral structure and is positioned between the first coil pipe and the liquid cavity, the outer surface of the second coil pipe is wound with a second coil pipe explosion-proof electric heating belt, and the bottom and the top of the second coil pipe are respectively connected with a second air inlet pipe and a second heat preservation pipe; the first heat preservation pipe is sequentially connected with a first thermocouple, a first valve, a first flow controller and a third heat preservation pipe; the second heat preservation pipe is sequentially connected with a second thermocouple, a second valve, a second flow controller and a third heat preservation pipe; the third heat preservation pipe is sequentially connected with a third valve, a third flow controller, a second heat preservation pipe, a first heat preservation pipe, an exhaust pipe, a fourth thermocouple and a fourth valve; the control cabinet is connected with the liquid cavity explosion-proof electric heating belt, the first coil explosion-proof electric heating belt, the second coil explosion-proof electric heating belt, the first flow controller, the second flow controller, the third flow controller, the first thermocouple, the second thermocouple, the third thermocouple, the fourth thermocouple and the pressure transmitter.
Wherein the device further comprises a safety valve and a vacuum pump. The heat-preserving barrel and the heat-preserving barrel cover are of hollow wall structures. The bottom of the heat preservation barrel is provided with supporting legs. The liquid cavity is of a cylindrical structure. And a drain pipe valve is arranged on the drain pipe. And a safety valve is arranged on the pressure relief pipe. And a fifth valve and a vacuum pump are arranged on the exhaust pipe. Insulating materials are filled among the heat insulating barrel, the liquid cavity, the first coil pipe and the second coil pipe. The first thermocouple, the second thermocouple and the fourth thermocouple are respectively positioned in the first heat preservation pipe, the second heat preservation pipe and the third heat preservation pipe.
The first thermocouple is arranged at the joint of the first heat preservation tube and the first coil. The second thermocouple is arranged at the joint of the second heat-insulating pipe and the second coil pipe. The first thermocouple temperature measuring point is located at the central axis of the first heat preservation tube and used for monitoring the temperature of the preheated air flow. The second thermocouple temperature measuring point is located the second insulating tube central axis for the air current temperature after the monitoring preheats. The fourth thermocouple is arranged below the fourth valve, and the temperature measuring point is positioned on the central axis of the third heat preservation pipe and used for monitoring the temperature of the front air flow entering the combustion experiment section.
Wherein, a liquid additive is placed in the liquid cavity; the first air inlet pipe and the second air inlet pipe are respectively connected with a first air inlet pipe valve and a second air inlet pipe valve; the pressure transmitter, the safety valve and the liquid level meter are all positioned outside the heat-preserving barrel; the third thermocouple stretches into the liquid cavity through the liquid inlet pipe, and the temperature measuring point is located the liquid cavity bottom.
The working process of the experimental device is as follows:
1) Closing a first air inlet pipe valve and a second air inlet pipe valve, connecting the first air inlet pipe and the second air inlet pipe with a high-pressure nitrogen gas cylinder, and connecting a third heat preservation pipe with a combustion experiment section;
2) Setting temperature warning values of the first thermocouple and the second thermocouple, pressure warning values of the pressure transmitter, expected temperature values of the third thermocouple and the fourth thermocouple on a control cabinet, and setting flow values of the first flow controller, the second flow controller and the third flow controller to be maximum;
3) Closing a liquid discharge pipe valve, opening a liquid inlet pipe valve and a third valve, injecting liquid additive into the liquid cavity through the liquid inlet pipe, observing the position of the liquid level of the additive in the liquid cavity through a liquid level meter, stopping liquid additive injection when the liquid level reaches the two-thirds height of the liquid cavity, and closing the liquid inlet pipe valve;
4) Closing the first valve, the second valve and the fourth valve, opening the fifth valve, operating the vacuum pump, and vacuumizing the liquid cavity;
5) Stopping the operation of the vacuum pump after the pressure in the liquid cavity reaches an experimental value, and closing the fifth valve and the third valve;
6) Heating the liquid additive in the liquid cavity;
7) Sequentially opening a fourth valve, a first valve and a first air inlet pipe valve to enable nitrogen to flow into the first coil, and simultaneously starting heating of the explosion-proof electric heating belt of the first coil;
8) When the temperature value measured by the fourth thermocouple reaches the expected temperature value and is stable, sequentially opening the second valve and the second air inlet pipe valve to enable nitrogen to flow into the second coil, and simultaneously starting heating by the explosion-proof electric heating belt of the second coil;
9) When the temperature value measured by the fourth thermocouple reaches the expected temperature value and is stable, if the pressure and the temperature in the liquid cavity meet the requirements, closing a first air inlet pipe valve and a second air inlet pipe valve, respectively connecting the first air inlet pipe and the second air inlet pipe with a high-pressure air bottle filled with gas required by a gas combustion experiment, and opening the first air inlet pipe valve, the second air inlet pipe valve and a third valve to enable additive steam to flow into a third heat insulation pipe;
10 Setting expected flow values of the first flow controller, the second flow controller and the third flow controller on a control cabinet, and carrying out a gas combustion experiment by utilizing the mixed gas entering a gas combustion experiment section from a third heat preservation pipe after the temperature value measured by the fourth thermocouple reaches the expected temperature value again and is stable to obtain the required combustible mixed gas containing the additive;
11 After the gas combustion experiment observation is completed, closing a fourth valve, then rapidly closing the third valve, the first air inlet pipe valve and the second air inlet pipe valve, and stopping running the liquid cavity explosion-proof electric heating belt, the first coil explosion-proof electric heating belt and the second coil explosion-proof electric heating belt; setting the flow values of the first flow controller, the second flow controller and the third flow controller to be maximum on a control cabinet, opening a fifth valve, operating a vacuum pump, vacuumizing a pipeline, and stopping the operation of the vacuum pump after a certain time; when the pressure in the liquid cavity is reduced to normal pressure, sequentially opening a liquid discharge pipe valve and a liquid inlet pipe valve, and discharging the liquid additive to a specific container; closing a valve of the liquid discharge pipe, injecting clear water through the liquid inlet pipe until the liquid cavity is full, then opening the valve of the liquid discharge pipe to discharge water, and repeating the process three to five times to ensure that the additive remained in the liquid cavity is cleaned; the explosion-proof electric heating belt of the liquid cavity is operated, so that residual moisture in the liquid cavity is heated and vaporized; closing a liquid inlet pipe valve and a liquid discharge pipe valve, opening a third valve, then operating a vacuum pump, and vacuumizing a pipeline and a liquid cavity; stopping the operation of the vacuum pump after the pressure in the liquid cavity reaches the experimental value, and closing the fifth valve; stopping the operation of the explosion-proof electric heating belt of the liquid cavity; opening the liquid inlet pipe valve, and closing the liquid inlet pipe valve after the pressure in the liquid cavity rises to normal pressure; and stopping the operation of the control cabinet.
Compared with the prior art, the invention has the advantages that:
(1) The double-spiral coil pipe design obviously increases the preheating distance of air flow, can realize simultaneous preheating of two paths of air, is wound with the coil pipe explosion-proof electric heating belt outside the coil pipe, and can rapidly and stably preheat the air;
(2) The liquid additive is placed in the liquid cavity, can be quickly heated and vaporized, and then mixed into preheated air flow;
(3) The automatic control system has the functions of high-efficiency quantitative control of the temperature and the component concentration of the mixed gas, and automatically controls the heating power of the explosion-proof electric heating belt of the coil pipe and the explosion-proof electric heating belt of the liquid cavity and the air flow passing through each flow controller through the control cabinet, so that the air flow temperature, the additive concentration and the air ratio of each path are efficiently regulated, the quick response can be realized, and the human error caused by manual operation can be avoided;
(4) The safety is high, the electric heating belt and the heat insulation material have electric explosion resistance, the glass tube type liquid level meter, the third thermocouple and the pressure transmitter are arranged on the liquid cavity, additives can be timely supplemented, the temperature and the pressure of the liquid cavity can be monitored in real time and can be rapidly controlled, and the safety valve is arranged on the liquid cavity;
(5) The structure is simple and compact, conventional equipment and materials are adopted, the spiral coil is used for heating gas, the coil and the liquid cavity are arranged in the same heat-preserving barrel, the processing and the use are convenient, and the space is saved.
Drawings
FIG. 1 is a schematic diagram of a gas preheating and additive vaporizing device for gas combustion experiments according to the present invention.
In the figure: 1-heat preservation barrel, 2-heat preservation barrel cover, 3-liquid cavity, 4-liquid inlet pipe, 5-liquid discharge pipe, 6-first coil pipe, 7-second coil pipe, 8-first air inlet pipe, 9-second air inlet pipe, 10-first heat preservation pipe, 11-second heat preservation pipe, 12-third heat preservation pipe, 13-exhaust pipe, 14-first flow controller, 15-second flow controller, 16-third flow controller, 17-first thermocouple, 18-second thermocouple, 19-third thermocouple, 20-fourth thermocouple, 21-pressure transmitter, 22-safety valve, 23-liquid level gauge, 24-control cabinet, 25-vacuum pump, 26-support leg, 27-liquid cavity explosion-proof electric heating belt, 28-pressure relief pipe, 29-liquid inlet pipe valve, 30-first coil pipe explosion-proof electric heating belt, 31-second coil pipe explosion-proof electric heating belt, 32-first valve, 33-second valve, 34-third valve, 35-fourth valve, 36-fifth valve, 37-first air inlet pipe valve, 38-first air inlet pipe, 39-second valve.
Detailed Description
The invention is described in further detail below with reference to the attached drawings and detailed description:
in fig. 1, a gas preheating and additive vaporizing device for a gas combustion experiment mainly comprises a heat insulation barrel 1, a heat insulation barrel cover 2, a liquid cavity 3, a liquid inlet pipe 4, a liquid discharge pipe 5, a first coil pipe 6, a second coil pipe 7, a first air inlet pipe 8, a second air inlet pipe 9, a first heat insulation pipe 10, a second heat insulation pipe 11, a third heat insulation pipe 12, an exhaust pipe 13, a first flow controller 14, a second flow controller 15, a third flow controller 16, a first thermocouple 17, a second thermocouple 18, a third thermocouple 19, a fourth thermocouple 20, a pressure transmitter 21, a safety valve 22, a liquid level meter 23, a control cabinet 24, a vacuum pump 25 and the like.
The heat-insulating barrel 1 and the heat-insulating barrel cover 2 adopt cylindrical structures, and the wall surfaces of the heat-insulating barrel and the heat-insulating barrel cover adopt hollow structures so as to achieve a heat-insulating effect. The heat-preserving barrel cover 2 covers the heat-preserving barrel 1. Four supporting legs 26 are arranged at the bottom of the heat preservation barrel 1, and the supporting legs 26 are of a cylindrical structure. The liquid cavity 3 is of a cylindrical structure, is arranged in the heat-preserving barrel 1 and is used for placing a liquid additive and enabling the liquid additive to be heated and vaporized; the central axis of the top of the liquid cavity 3 is connected with a third heat preservation pipe 12; a liquid inlet pipe 4 is arranged at the position of the top of the liquid cavity 3, which is away from the central axis by two thirds of the inner radius of the liquid cavity 3, the lower part of the liquid inlet pipe 4 is connected with the upper end of a liquid level meter 23, a liquid inlet pipe valve 29 is arranged at the top, and a transverse branch pipe is arranged at the middle part of the liquid inlet pipe for installing a pressure transmitter 21 and monitoring the steam pressure in the liquid cavity 3; the liquid inlet pipe 4 rotates 180 degrees around the central axis of the liquid cavity 3, a pressure relief pipe 28 is arranged at the position, and a safety valve 22 is arranged on the pressure relief pipe 28 to prevent the occurrence of danger due to overlarge steam pressure in the liquid cavity 3; a liquid discharge pipe 5 is arranged at the central axis of the bottom of the liquid cavity 3, and the liquid discharge pipe 5 is sequentially connected with the lower end of the liquid level meter 23 and a liquid discharge valve 37; the outer surface of the side wall of the liquid cavity 3 is provided with a spiral groove to improve heat exchange efficiency, and the liquid additive in the liquid cavity 3 is heated along the spiral groove wound on the explosion-proof electric heating belt 27 of the liquid cavity, so that the additive is quickly vaporized. The upper end of the liquid level meter 23 is positioned inside the heat preservation barrel cover 2 and is connected with the liquid inlet pipe 4, the lower end of the liquid level meter 23 is positioned inside the heat preservation barrel 1 and is connected with the liquid discharge pipe 5, the middle part of the liquid level meter 23 is of a vertical heat preservation glass pipe structure and is positioned outside the heat preservation barrel 1 and the heat preservation barrel cover 2 and is used for displaying the liquid level position. The third thermocouple 19 stretches into the liquid cavity 3 through the liquid inlet pipe 4, and a temperature measuring point of the third thermocouple 19 is located at the bottom of the liquid cavity 3 and is used for monitoring the temperature of the liquid additive. The first coil pipe 6 is of a copper spiral structure, is positioned between the heat-insulating barrel 1 and the liquid cavity 3, is wound with a first coil pipe explosion-proof electric heating belt 30 on the outer surface, and the bottom and the top of the first coil pipe 6 are respectively connected with a first air inlet pipe 8 and a first heat-insulating pipe 10; the second coil pipe 7 is of a copper spiral structure, is positioned between the first coil pipe 6 and the liquid cavity 3, is wound with a second coil pipe explosion-proof electric heating belt 31 on the outer surface, and the bottom and the top of the second coil pipe 7 are respectively connected with a second air inlet pipe 9 and a second heat preservation pipe 11; the spiral structure design can obviously increase the preheating distance of the air flow, improve the preheating efficiency and uniformity, and enable the temperature of the air flow to be more stable. The first air inlet pipe 8 and the second air inlet pipe 9 are respectively provided with a first air inlet pipe valve 38 and a second air inlet pipe valve 39. The first heat preservation pipe 10 is sequentially connected with a first thermocouple 17, a first valve 32, a first flow controller 14 and a third heat preservation pipe 12. The second heat-insulating pipe 11 is sequentially connected with a second thermocouple 18, a second valve 33, a second flow controller 15 and a third heat-insulating pipe 12. The third heat-preserving pipe 12 is sequentially connected with a third valve 34, a third flow controller 16, a second heat-preserving pipe 11, a first heat-preserving pipe 10, an exhaust pipe 13, a fourth thermocouple 20 and a fourth valve 35. The exhaust pipe 13 is provided with a fifth valve 36 and a vacuum pump 25. The first thermocouple 17 is arranged at the joint of the first heat preservation pipe 10 and the first coil pipe 6, and the second thermocouple 18 is arranged at the joint of the second heat preservation pipe 11 and the second coil pipe 7. The temperature measuring point of the first thermocouple 17 is located at the central axis of the first heat preservation tube 10 and is used for monitoring the temperature of the preheated air flow. The second thermocouple 18 temperature measuring point is located at the central axis of the second heat preservation pipe 11 and is used for monitoring the temperature of the preheated air flow. The fourth thermocouple 20 is installed below the fourth valve 35, and a temperature measuring point is located at the central axis of the third heat insulation pipe 12 and is used for monitoring the temperature of the air flow before entering the combustion experiment section. The control cabinet 24 is connected with the liquid cavity explosion-proof electric heating belt 27, the first coil explosion-proof electric heating belt 30, the second coil explosion-proof electric heating belt 31, the first flow controller 14, the second flow controller 15, the third flow controller 16, the first thermocouple 17, the second thermocouple 18, the third thermocouple 19, the fourth thermocouple 20 and the pressure transmitter 21. Insulating materials are filled among the heat insulating barrel 1, the liquid cavity 3, the first coil pipe 6 and the second coil pipe 7.
The control cabinet 24 works according to the following principle: setting a desired temperature value of the third thermocouple 19, and when the temperature of the liquid additive in the liquid cavity 3 measured by the third thermocouple 19 is lower than the desired temperature value, automatically increasing the heating power of the liquid cavity explosion-proof electric heating belt 27 by the control cabinet 24; when the temperature of the liquid additive in the liquid cavity 3 measured by the third thermocouple 19 is higher than a desired temperature value, the control cabinet 24 automatically reduces the heating power of the liquid cavity explosion-proof electric heating belt 27 until the temperature value measured by the third thermocouple 19 is stabilized at the set desired temperature value; and meanwhile, the pressure warning value of the pressure transmitter 21 is set, and when the steam pressure in the liquid cavity 3 measured by the pressure transmitter 21 reaches the pressure warning value, the control cabinet 24 automatically reduces the heating power of the liquid cavity explosion-proof electric heating belt 27. Setting a desired temperature value of the fourth thermocouple 20, and when the temperature of the air flow measured by the fourth thermocouple 20 before entering the combustion experiment section is lower than the desired temperature value, automatically increasing the heating power of the first coil explosion-proof electric heating belt 30 and the second coil explosion-proof electric heating belt 31 by the control cabinet 24; when the temperature of the air flow measured by the fourth thermocouple 20 before entering the combustion experiment section is higher than the expected temperature value, the control cabinet 24 automatically reduces the heating power of the first coil explosion-proof electric heating belt 30 and the second coil explosion-proof electric heating belt 31 until the temperature value measured by the fourth thermocouple 20 is stabilized at the set expected temperature value; simultaneously, temperature warning values of the first thermocouple 17 and the second thermocouple 18 are respectively set, and when the first thermocouple 17 detects that the temperature of the air flow after the first coil 6 is preheated reaches the temperature warning value, the control cabinet 24 automatically reduces the heating power of the explosion-proof electric heating belt 30 of the first coil; when the second thermocouple 18 detects that the temperature of the air flow after the second coil 7 is preheated reaches the temperature warning value, the control cabinet 24 automatically reduces the heating power of the explosion-proof electric heating belt 31 of the second coil.
The working process of the experimental device is as follows:
1) Closing a first air inlet pipe valve 38 and a second air inlet pipe valve 39, connecting the first air inlet pipe 8 and the second air inlet pipe 9 with a high-pressure nitrogen gas cylinder, and connecting the third heat preservation pipe 12 with a combustion experiment section;
2) Setting the temperature warning values of the first thermocouple 17 and the second thermocouple 18, the pressure warning value of the pressure transmitter 21, the desired temperature values of the third thermocouple 19 and the fourth thermocouple 20, and setting the flow values of the first flow controller 14, the second flow controller 15 and the third flow controller 16 to be maximum values on the control cabinet 24;
3) Closing the drain pipe valve 37, opening the liquid inlet pipe valve 29 and the third valve 34, injecting the liquid additive into the liquid cavity 3 through the liquid inlet pipe 4, simultaneously observing the position of the liquid level of the additive in the liquid cavity 3 through the liquid level meter 23, stopping the injection of the liquid additive when the liquid level reaches the two-thirds height of the liquid cavity 3, and closing the liquid inlet pipe valve 29;
4) Closing the first valve 32, the second valve 33 and the fourth valve 35, opening the fifth valve 36, operating the vacuum pump 25, and vacuumizing the liquid cavity 3;
5) When the pressure in the liquid cavity 3 reaches the experimental value, stopping the operation of the vacuum pump 25, and closing the fifth valve 36 and the third valve 34;
6) Heating the liquid additive in the liquid cavity 3;
7) Sequentially opening the fourth valve 35, the first valve 32 and the first air inlet pipe valve 38 to enable nitrogen to flow into the first coil 6, and simultaneously starting heating of the first coil explosion-proof electric heating belt 30;
8) After the temperature value measured by the fourth thermocouple 20 reaches the expected temperature value and is stable, the second valve 33 and the second air inlet pipe valve 39 are sequentially opened, so that nitrogen flows into the second coil pipe 7, and the explosion-proof electric heating belt 31 of the second coil pipe starts to be heated;
9) After the temperature value measured by the fourth thermocouple 20 reaches the expected temperature value and is stable, if the pressure and the temperature in the liquid cavity 3 meet the requirements, closing the first air inlet pipe valve 38 and the second air inlet pipe valve 39, respectively connecting the first air inlet pipe 8 and the second air inlet pipe 9 with a high-pressure air bottle filled with gas required by a gas combustion experiment, and opening the first air inlet pipe valve 38, the second air inlet pipe valve 39 and the third valve 34 to enable additive steam to flow into the third heat insulation pipe 12;
10 Setting the expected flow values of the first flow controller 14, the second flow controller 15 and the third flow controller 16 on the control cabinet 24, quantitatively regulating and controlling the flow rate of the mixed gas and the concentration of each component, and after the temperature value measured by the fourth thermocouple 20 reaches the expected temperature value again and is stable, obtaining the required combustible mixed gas containing the additive, and carrying out a gas combustion experiment by using the mixed gas entering the gas combustion experiment section from the third heat preservation pipe 12;
11 After the gas combustion experiment observation is completed, the fourth valve 35 is closed, then the third valve 34, the first air inlet pipe valve 38 and the second air inlet pipe valve 39 are rapidly closed, and the operation of the liquid cavity explosion-proof electric heating belt 27, the first coil explosion-proof electric heating belt 30 and the second coil explosion-proof electric heating belt 31 is stopped; setting the flow values of the first flow controller 14, the second flow controller 15 and the third flow controller 16 to be maximum on the control cabinet 24, opening a fifth valve 36, operating the vacuum pump 25, vacuumizing the pipeline, and stopping the operation of the vacuum pump 25 after a certain time; when the pressure in the liquid cavity 3 is reduced to normal pressure, the liquid discharge pipe valve 37 and the liquid inlet pipe valve 29 are sequentially opened to discharge the liquid additive to a specific container; closing the drain pipe valve 37, injecting clear water through the liquid inlet pipe 4 until the liquid cavity 3 is full, then opening the drain pipe valve 37 to drain water, and repeating the process three to five times to ensure that the additive remained in the liquid cavity 3 is cleaned; the liquid cavity explosion-proof electric heating belt 27 is operated to heat and vaporize residual moisture in the liquid cavity 3; closing the valve 29 of the liquid inlet pipe and the valve 37 of the liquid outlet pipe, opening the third valve 34, and then operating the vacuum pump 25 to vacuumize the pipeline and the liquid cavity 3; stopping the operation of the vacuum pump 25 when the pressure in the liquid cavity 3 reaches the experimental value, and closing the fifth valve 36; stopping the operation of the liquid cavity explosion-proof electric heating belt 27; opening the liquid inlet pipe valve 29, and closing the liquid inlet pipe valve 29 after the pressure in the liquid cavity 3 rises to normal pressure; the operation of the control cabinet 24 is stopped.
The invention, in part, is not disclosed in detail and is well known in the art.
While the foregoing describes illustrative embodiments of the present invention to facilitate an understanding of the present invention by those skilled in the art, it should be understood that the present invention is not limited to the scope of the embodiments, but is to be construed as protected by the accompanying claims insofar as various changes are within the spirit and scope of the present invention as defined and defined by the appended claims.
Claims (7)
1. A gas preheating and additive vaporization device for combustible gas burning experiments, characterized in that: the device comprises a heat preservation barrel (1), a heat preservation barrel cover (2), a liquid cavity (3), a liquid inlet pipe (4), a liquid discharge pipe (5), a first coil pipe (6), a second coil pipe (7), a first air inlet pipe (8), a second air inlet pipe (9), a first heat preservation pipe (10), a second heat preservation pipe (11), a third heat preservation pipe (12), an exhaust pipe (13), a first flow controller (14), a second flow controller (15), a third flow controller (16), a first thermocouple (17), a second thermocouple (18), a third thermocouple (19), a fourth thermocouple (20), a pressure transmitter (21), a liquid level meter (23) and a control cabinet (24);
the heat-preserving barrel cover (2) covers the heat-preserving barrel (1); the liquid cavity (3) is arranged in the heat-insulating barrel (1), the liquid cavity (3) is communicated with the liquid level meter (23), a spiral groove is formed in the outer surface of the side wall of the liquid cavity (3), the liquid cavity explosion-proof electric heating belt (27) is wound along the spiral groove, the top of the liquid cavity (3) is connected with the liquid inlet pipe (4), the third heat-insulating pipe (12), the pressure relief pipe (28) and the third thermocouple (19), and the bottom of the liquid cavity (3) is connected with the liquid outlet pipe (5); a liquid inlet pipe valve (29) and a pressure transmitter (21) are arranged on the liquid inlet pipe (4); the first coil pipe (6) is of a spiral structure, is positioned between the heat-insulating barrel (1) and the liquid cavity (3), is wound on the outer surface of the first coil pipe, is provided with a first coil pipe explosion-proof electric heating belt (30), and is respectively connected with a first air inlet pipe (8) and a first heat-insulating pipe (10) at the bottom and the top of the first coil pipe (6); the second coil pipe (7) is of a spiral structure, is positioned between the first coil pipe (6) and the liquid cavity (3), is wound on the outer surface of the second coil pipe, is provided with a second coil pipe explosion-proof electric heating belt (31), and is respectively connected with a second air inlet pipe (9) and a second heat preservation pipe (11) at the bottom and the top of the second coil pipe (7); the first heat preservation pipe (10) is sequentially connected with a first thermocouple (17), a first valve (32), a first flow controller (14) and a third heat preservation pipe (12); the second heat-insulating pipe (11) is sequentially connected with a second thermocouple (18), a second valve (33), a second flow controller (15) and a third heat-insulating pipe (12); the third heat preservation pipe (12) is sequentially connected with a third valve (34), a third flow controller (16), a second heat preservation pipe (11), a first heat preservation pipe (10), an exhaust pipe (13), a fourth thermocouple (20) and a fourth valve (35);
the control cabinet (24) is connected with the liquid cavity explosion-proof electric heating belt (27), the first coil explosion-proof electric heating belt (30), the second coil explosion-proof electric heating belt (31), the first flow controller (14), the second flow controller (15), the third flow controller (16), the first thermocouple (17), the second thermocouple (18), the third thermocouple (19), the fourth thermocouple (20) and the pressure transmitter (21).
2. A gas preheating and additive vaporizing device for combustible gas combustion experiments according to claim 1, wherein: the heat-insulating barrel (1) and the heat-insulating barrel cover (2) are of hollow wall structures; preferably, the bottom of the heat-preserving barrel (1) is provided with supporting legs (26); preferably the liquid chamber (3) is of cylindrical configuration; preferably, the drain pipe (5) is provided with a drain pipe valve (37); preferably, the pressure relief pipe (28) is provided with a safety valve (22); preferably, a fifth valve (36) and a vacuum pump (25) are arranged on the exhaust pipe (13); preferably, insulating materials are filled among the heat insulation barrel (1), the liquid cavity (3), the first coil pipe (6) and the second coil pipe (7); preferably the first thermocouple temperature measuring point is located in a first heat preservation tube (10); preferably, the temperature measuring point of the second thermocouple (18) is positioned in the second heat insulation pipe (11); preferably, the temperature measuring point of the fourth thermocouple (20) is positioned in the third heat insulation pipe (12).
3. A gas preheating and additive vaporizing device for combustible gas combustion experiments according to claim 1, wherein: and a liquid additive is placed in the liquid cavity (3).
4. A gas preheating and additive vaporizing device for combustible gas combustion experiments according to claim 1, wherein: the first air inlet pipe (8) and the second air inlet pipe (9) are respectively connected with a first air inlet pipe valve (38) and a second air inlet pipe valve (39).
5. A gas preheating and additive vaporizing device for combustible gas combustion experiments according to claim 1, wherein: the pressure transmitter (21), the safety valve (22) and the liquid level meter (23) are all positioned outside the heat preservation barrel (1).
6. A gas preheating and additive vaporizing device for combustible gas combustion experiments according to claim 1, wherein: the third thermocouple (19) stretches into the liquid cavity (3) through the liquid inlet pipe (4), and the temperature measuring point is located at the bottom of the liquid cavity (3).
7. A gas preheating and additive vaporizing device for combustible gas combustion experiments according to any one of claims 1-6 wherein: the working process of the device is as follows:
1) Closing a first air inlet pipe valve (38) and a second air inlet pipe valve (39), connecting the first air inlet pipe (8) and the second air inlet pipe (9) with a high-pressure nitrogen gas cylinder, and connecting a third heat preservation pipe (12) with a combustion experiment section;
2) Setting temperature warning values of the first thermocouple (17) and the second thermocouple (18), pressure warning values of the pressure transmitter (21), expected temperature values of the third thermocouple (19) and the fourth thermocouple (20) on a control cabinet (24), and setting flow values of the first flow controller (14), the second flow controller (15) and the third flow controller (16) to be maximum values;
3) Closing a liquid discharge pipe valve (37), opening a liquid inlet pipe valve (29) and a third valve (34), injecting liquid additive into the liquid cavity (3) through the liquid inlet pipe (4), observing the position of the liquid level of the additive in the liquid cavity (3) through a liquid level meter (23), stopping liquid additive injection when the liquid level reaches two thirds of the height of the liquid cavity (3), and closing the liquid inlet pipe valve (29);
4) Closing the first valve (32), the second valve (33) and the fourth valve (35), opening the fifth valve (36), operating the vacuum pump (25), and vacuumizing the liquid cavity (3);
5) When the pressure in the liquid cavity (3) reaches an experimental value, stopping the operation of the vacuum pump (25), and closing the fifth valve (36) and the third valve (34);
6) Heating the liquid additive in the liquid cavity (3);
7) Sequentially opening a fourth valve (35), a first valve (32) and a first air inlet pipe valve (38) to enable nitrogen to flow into the first coil (6), and simultaneously starting heating of the explosion-proof electric heating belt (30) of the first coil;
8) When the temperature value measured by the fourth thermocouple (20) reaches a desired temperature value and is stable, sequentially opening a second valve (33) and a second air inlet pipe valve (39) to enable nitrogen to flow into the second coil (7), and simultaneously starting heating of the explosion-proof electric heating belt (31) of the second coil;
9) When the temperature value measured by the fourth thermocouple (20) reaches a desired temperature value and is stable, if the pressure and the temperature in the liquid cavity (3) meet the requirements, closing a first air inlet pipe valve (38) and a second air inlet pipe valve (39), respectively connecting the first air inlet pipe (8) and the second air inlet pipe (9) with a high-pressure air bottle filled with gas required by a combustible gas combustion experiment, and opening the first air inlet pipe valve (38), the second air inlet pipe valve (39) and a third valve (34) to enable additive steam to flow into a third heat insulation pipe (12);
10 Setting the expected flow values of the first flow controller (14), the second flow controller (15) and the third flow controller (16) on a control cabinet (24), and when the temperature value measured by the fourth thermocouple (20) reaches the expected temperature value again and is stable, obtaining the required combustible mixed gas containing the additive, and carrying out a gas combustion experiment by utilizing the mixed gas entering a combustion experiment section from the third heat preservation pipe (12);
11 After the gas combustion experiment observation is completed, the fourth valve (35) is closed, then the third valve (34), the first air inlet pipe valve (38) and the second air inlet pipe valve (39) are rapidly closed, and the operation of the liquid cavity explosion-proof electric heating belt (27), the first coil explosion-proof electric heating belt (30) and the second coil explosion-proof electric heating belt (31) is stopped; setting the flow values of the first flow controller (14), the second flow controller (15) and the third flow controller (16) to be maximum on a control cabinet (24), opening a fifth valve (36), operating a vacuum pump (25), vacuumizing the pipeline, and stopping the operation of the vacuum pump (25) after a certain time; when the pressure in the liquid cavity (3) is reduced to normal pressure, a liquid discharge pipe valve (37) and a liquid inlet pipe valve (29) are sequentially opened, and the liquid additive is discharged to the container; closing a drain pipe valve (37), injecting clear water through a liquid inlet pipe (4) until the liquid cavity (3) is full, then opening the drain pipe valve (37) to drain water, and repeating the process three to five times to ensure that the additive remained in the liquid cavity (3) is cleaned; operating the explosion-proof electric heating belt (27) of the liquid cavity to enable residual moisture in the liquid cavity (3) to be heated and vaporized; closing the valve (29) of the liquid inlet pipe and the valve (37) of the liquid outlet pipe, opening the third valve (34), and then operating the vacuum pump (25) to vacuumize the pipeline and the liquid cavity (3); stopping the operation of the vacuum pump (25) when the pressure in the liquid cavity (3) reaches an experimental value, and closing a fifth valve (36); stopping the operation of the explosion-proof electric heating belt (27) of the liquid cavity; opening a liquid inlet pipe valve (29), and closing the liquid inlet pipe valve (29) after the pressure in the liquid cavity (3) rises to normal pressure; stopping the operation of the control cabinet (24).
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| KR200181316Y1 (en) * | 1999-12-18 | 2000-05-15 | 포항종합제철주식회사 | An explosion detection and explosion prevention system of a hot wind blast combustion type air supply pipe in a blast furnace |
| CN103210702A (en) * | 2011-01-26 | 2013-07-17 | 深圳市泓耀环境科技发展股份有限公司 | Adding method for combustion additive for combustion of liquid fuel and plasmatron device therefor |
| CN106568887A (en) * | 2016-10-14 | 2017-04-19 | 中国科学院合肥物质科学研究院 | Experimental device for research on hydrogen combustion in nuclear power plant containment shell |
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2021
- 2021-12-22 CN CN202111579892.1A patent/CN114323904B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR200181316Y1 (en) * | 1999-12-18 | 2000-05-15 | 포항종합제철주식회사 | An explosion detection and explosion prevention system of a hot wind blast combustion type air supply pipe in a blast furnace |
| CN103210702A (en) * | 2011-01-26 | 2013-07-17 | 深圳市泓耀环境科技发展股份有限公司 | Adding method for combustion additive for combustion of liquid fuel and plasmatron device therefor |
| CN106568887A (en) * | 2016-10-14 | 2017-04-19 | 中国科学院合肥物质科学研究院 | Experimental device for research on hydrogen combustion in nuclear power plant containment shell |
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