Quantitative oxygen supply path device for high-pressure combustion

Abstract

The utility model provides a kind of high-pressure combustion's quantitative oxygen supply path device, comprising: crucible, combustion furnace, main oxygen supply path and quantitative supplementary oxygen supply system, the crucible is arranged in combustion furnace, the main oxygen supply path is connected with the internal cavity of combustion furnace, for filling oxygen into combustion furnace before combustion;The quantitative supplementary oxygen supply system includes supplementary gas tank and connecting pipeline;The supplementary gas tank is connected with the inside of combustion furnace by connecting pipeline, and its outlet is arranged in the combustion area where crucible is located;The quantitative supplementary oxygen supply system can store the quantitative oxygen in supplementary gas tank in advance during sample combustion process, and supplement to the combustion area.The utility model solves the problems of difficult to accurately control oxygen supply, high equipment cost and difficult to maintain in the prior art, and ensures the accuracy of oxygen quantity by pre-charging oxygen and quantitative supplementary oxygen design, avoids high-pressure risk in low-pressure environment, improves the accuracy and reliability of elemental analysis.

Description

Technical Field

[0001] This utility model relates to the field of analytical testing technology, and in particular to a high-pressure combustion quantitative oxygen supply circuit device. Background Technology

[0002] In the process of elemental analysis of samples such as coal, ore, biomass, and pharmaceuticals, it is usually necessary to burn and decompose the samples, and calculate the content of each element in the sample by analyzing the oxygen concentration in the mixed gas after combustion. Existing combustion analysis techniques mainly include high-temperature furnace combustion method and high-pressure oxygen bomb combustion method.

[0003] The high-temperature furnace combustion method uses a high-temperature furnace body and introduces oxygen at normal pressure. The sample is burned at high temperature by external heating (such as silicon carbide tubes, corundum tubes, etc.). Although this method can achieve complete combustion of the sample, it has problems such as long combustion time, high energy consumption, easy damage to heating elements, and complex equipment structure and high maintenance cost.

[0004] The high-pressure oxygen bomb combustion method (such as the oxygen bomb technology used in calorimeters) involves filling a sealed container with oxygen at pressures up to 3.0 MPa and igniting the sample under high pressure. While this method can achieve rapid combustion, the extremely high pressure places stringent requirements on the pressure resistance of the gas circuit components, resulting in high equipment costs. Furthermore, the high pressure environment increases the condensation temperature of water (H element), which is prone to condensation after combustion, affecting the accuracy of the test results. Therefore, this method is usually only used for measuring the calorific value of combustion and is not suitable for oxygen concentration analysis.

[0005] In addition, there is a scheme in the existing technology that involves combustion in a medium-low pressure environment and real-time oxygen replenishment. Although this scheme can avoid the disadvantages of high-temperature furnaces and high-pressure oxygen bombs, the pressure changes inside the furnace due to the temperature rise during combustion make it difficult to accurately calculate the total amount of oxygen charged, thus affecting the accuracy of the final elemental analysis.

[0006] Therefore, there is still a lack of a medium- and low-pressure combustion oxygen supply device that can ensure complete combustion, safety and reliability, and accurately control the total amount of oxygen, and is suitable for elemental analysis. Utility Model Content

[0007] In view of this, the purpose of this utility model is to provide a quantitative oxygen supply circuit device for high-pressure combustion, which introduces a quantitative amount of oxygen under non-combustion heating conditions and then introduces it into the combustion furnace during combustion, so as to ensure that the amount of oxygen introduced each time for each combustion analysis is accurate and stable.

[0008] The technical solution adopted by this utility model to solve its technical problem is:

[0009] A high-pressure combustion quantitative oxygen supply circuit device is provided, comprising: a crucible, a combustion furnace, a main oxygen supply circuit, and a quantitative supplementary oxygen supply system. The crucible is disposed inside the combustion furnace and is used to hold the sample to be tested. The main oxygen supply circuit is connected to the internal cavity of the combustion furnace and is used to charge oxygen into the combustion furnace before combustion. The quantitative supplementary oxygen supply system includes a supplementary gas tank and a connecting pipeline. The supplementary gas tank is connected to the interior of the combustion furnace through the connecting pipeline, and its outlet is located in the combustion zone where the crucible is located. The quantitative supplementary oxygen supply system can supplement the combustion zone with a quantitative amount of oxygen pre-stored in the supplementary gas tank during sample combustion.

[0010] Preferably, the combustion furnace includes a sealed furnace body and a furnace cover. The furnace cover is equipped with an oxygen charging head and an ignition device. The main oxygen supply line is connected to the internal cavity of the combustion furnace through the oxygen charging head. The ignition device is located on the furnace cover directly above the crucible and can ignite the sample to be tested. The side wall of the furnace body is provided with an analytical gas outlet and a gas replenishment port. The quantitative oxygen replenishment system is connected to the internal cavity of the combustion furnace through the gas replenishment port. The analytical gas outlet is connected to external analytical equipment, and a fourth solenoid valve is provided on its connecting pipeline.

[0011] Preferably, a pressure sensor is also provided on the furnace cover, which can detect pressure changes inside the combustion furnace in real time.

[0012] Preferably, the main oxygen supply circuit includes an oxygen source, a pressure regulating valve, and a first solenoid valve. The oxygen source provides the oxygen required for combustion of the device. The pressure regulating valve is installed on the oxygen source and can regulate the pressure of the output oxygen. The first solenoid valve is installed on the connecting pipeline between the oxygen source and the combustion furnace and can control the on / off connection between the main oxygen supply circuit and the combustion furnace.

[0013] Preferably, the quantitative supplemental oxygen supply system includes a second solenoid valve, a third solenoid valve, a speed regulating valve, and a supplemental gas tank. One end of the supplemental gas tank is connected to the combustion furnace, and the other end is connected to the main oxygen supply line. The second solenoid valve is installed on the connecting pipeline between the supplemental gas tank and the combustion furnace, and the third solenoid valve and the speed regulating valve are installed on the connecting pipeline between the supplemental gas tank and the main oxygen supply line.

[0014] Preferably, the supplementary gas cylinder is a piston-type gas cylinder, which is divided into a first chamber and a second chamber that are not interconnected by a piston; the first chamber is connected to the combustion zone of the combustion furnace through a connecting pipe, and the second chamber is connected to the oxygen source through a connecting pipe.

[0015] Preferably, the speed regulating valve is installed on the connecting pipeline between the third solenoid valve and the second chamber, and is capable of regulating the oxygen flow rate entering the second chamber.

[0016] Preferably, it also includes a control system, which is connected to the pressure sensor, the first solenoid valve, the second solenoid valve, the third solenoid valve, the fourth solenoid valve and the ignition device, and is able to control each component to work together according to a preset program.

[0017] Preferably, the furnace body of the combustion furnace is further provided with a crucible support, on which the crucible is placed; and the height of the crucible support is adapted to the position of the ignition device.

[0018] Preferably, the oxygen pressure supplied to the combustion furnace through the main oxygen supply line before combustion is in the range of 0.1MPa-1MPa.

[0019] The beneficial effects of this utility model are:

[0020] This utility model provides a high-pressure combustion quantitative oxygen supply circuit device. Through the design of "pre-oxygenation + quantitative oxygen replenishment", a fixed amount of oxygen is injected into the combustion furnace and the first chamber of the replenishment gas tank under non-combustion heating conditions, avoiding the influence of temperature changes during combustion on the calculation of the total oxygen amount. With the addition of a piston-type double-chamber replenishment gas tank, the accuracy of oxygen supply is ensured, and the reliability of elemental analysis results is significantly improved. The medium-low pressure design avoids the safety hazards and water condensation problems caused by high-pressure environments, while reducing the requirements for the pressure resistance performance of the equipment, reducing equipment manufacturing costs and maintenance difficulties. The complete automated control system realizes the automated operation of the entire combustion analysis process, improving the convenience of operation and system reliability. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of a high-pressure combustion quantitative oxygen supply circuit device according to the present invention.

[0022] In the diagram: 1. Furnace body; 2. Furnace cover; 3. Crucible; 4. Analytical gas outlet; 5. Gas supply port; 6. Oxygen charging head; 7. Ignition device; 8. Pressure sensor; 9. Oxygen source; 10. Pressure regulating valve; 11. First solenoid valve; 12. Second solenoid valve; 13. Third solenoid valve; 14. Fourth solenoid valve; 15. Speed ​​control valve; 16. Gas supply tank.

[0023] It should be noted that these accompanying drawings and textual descriptions are not intended to limit the scope of the present invention in any way, but rather to illustrate the concept of the present invention to those skilled in the art by referring to specific embodiments. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] like Figure 1 As shown, a high-pressure combustion quantitative oxygen supply circuit device includes: a crucible 3, a combustion furnace, a main oxygen supply circuit, and a quantitative supplementary oxygen supply system. The crucible 3 is placed inside the combustion furnace to hold the sample to be tested. The main oxygen supply circuit is connected to the internal cavity of the combustion furnace and is used to fill the combustion furnace with oxygen before combustion. The quantitative supplementary oxygen supply system includes a supplementary gas tank 16 and a connecting pipeline. The supplementary gas tank 16 is connected to the interior of the combustion furnace through the connecting pipeline, and its outlet is located in the combustion area where the crucible 3 is located. The quantitative supplementary oxygen supply system can supplement the combustion area with a quantitative amount of oxygen pre-stored in the supplementary gas tank 16 during sample combustion.

[0026] It should be noted that crucible 3, as the physical container for the sample, can fix the spatial position of the sample to be tested within the combustion furnace, ensuring stable combustion within the preset combustion area and avoiding incomplete combustion or uneven heat distribution caused by sample displacement. The combustion furnace, as the core combustion space, provides a relatively enclosed environment for sample combustion, preventing oxygen leakage during combustion and gas loss after combustion, ensuring the combustion reaction takes place within a controllable space. The main oxygen supply line, connected to the internal cavity of the combustion furnace, delivers oxygen into the furnace before sample combustion begins, pre-storing initial oxygen for the combustion reaction and meeting the oxygen requirements during the sample combustion start-up phase. This system lays the foundation for the smooth initiation of the combustion reaction. The supplementary gas tank 16 in the quantitative oxygen supply system is used to pre-store a quantitative amount of oxygen before combustion. The connecting pipeline serves as an oxygen delivery channel, connecting the supplementary gas tank 16 to the combustion zone where the crucible 3 is located in the combustion furnace. During the sample combustion process, when the initial oxygen in the furnace is consumed due to combustion, the quantitative oxygen supply system can accurately deliver the quantitative amount of oxygen pre-stored in the supplementary gas tank 16 to the combustion zone through the connecting pipeline, continuously replenishing oxygen for the combustion reaction to ensure complete combustion. At the same time, relying on the pre-stored quantitative mode, the system avoids the impact of environmental changes during combustion on the stability of the oxygen supply.

[0027] In one embodiment, the combustion furnace includes a sealed furnace body 1 and a furnace cover 2. The furnace cover 2 is provided with an oxygen charging head 6 and an ignition device 7. The main oxygen supply line is connected to the internal cavity of the combustion furnace through the oxygen charging head 6. The ignition device 7 is located on the furnace cover 2 directly above the crucible 3 and can ignite the sample to be tested. The side wall of the furnace body 1 is provided with an analytical gas outlet 4 and a gas replenishment port 5. The quantitative oxygen replenishment system is connected to the internal cavity of the combustion furnace through the gas replenishment port 5. The analytical gas outlet 4 is connected to external analytical equipment, and a fourth solenoid valve 14 is provided on its connecting pipeline.

[0028] It should be noted that the furnace body 1 and the furnace cover 2 are connected by a sealing structure, together forming a sealed combustion chamber that can maintain a medium-low pressure environment, preventing gas leakage during combustion, ensuring the stability of the total amount of oxygen and pressure inside, and providing a closed reaction space for accurate calculations; the oxygen charging head 6, as a dedicated interface between the main oxygen supply line and the internal cavity of the combustion furnace, can safely and efficiently introduce the external oxygen source 9 into the sealed furnace cavity, while ensuring the overall sealing of the furnace cover 2 after it is closed; the ignition device 7 is set on the furnace cover 2 directly above the crucible 3, which can accurately ignite the sample to be tested in the crucible 3. By igniting directly above the sample, the reliability of ignition and combustion are ensured. The accuracy of the starting position of combustion is ensured; the analytical gas outlet 4 on the side wall of the furnace body 1 is used to export the mixed gas after combustion, providing a necessary channel for subsequent gas analysis; the gas supply port 5 can accurately introduce a quantitative amount of oxygen from the gas supply tank 16 into the furnace during combustion, and guide the oxygen flow to the combustion area where the crucible 3 is located through its position design; the fourth solenoid valve 14 set on the analytical gas outlet 4 passage can precisely control the opening and closing of the analytical gas outlet 4, keeping it closed during combustion to prevent gas leakage, and opening it in a timely manner after combustion to allow the mixed gas to enter the analysis equipment, thereby ensuring the accuracy and reliability of the analysis results.

[0029] In one embodiment, a pressure sensor 8 is also provided on the furnace cover 2, which can detect pressure changes inside the combustion furnace in real time.

[0030] It should be noted that pressure sensor 8 converts pressure changes into electrical signal output, providing the system with real-time monitoring data of the pressure status inside the combustion furnace. By continuously monitoring pressure changes, the pressure fluctuations during the combustion process can be grasped in a timely manner, providing an important basis for judging whether the combustion is proceeding normally, whether the oxygen supply is sufficient, and whether there are any abnormalities such as leaks, thereby ensuring the safety and accuracy of the entire combustion analysis process.

[0031] In one embodiment, the main oxygen supply circuit includes an oxygen source 9, a pressure regulating valve 10, and a first solenoid valve 11. The oxygen source 9 provides the oxygen required for combustion of the device. The pressure regulating valve 10 is installed on the oxygen source 9 and can regulate the pressure of the output oxygen. The first solenoid valve 11 is installed on the connecting pipeline between the oxygen source 9 and the combustion furnace and can control the on / off connection between the main oxygen supply circuit and the combustion furnace.

[0032] It should be noted that oxygen source 9, as the oxygen supply source of the entire device, provides a continuous and stable oxygen source for the combustion process, ensuring sufficient oxidant for the combustion reaction; pressure regulating valve 10 is installed on oxygen source 9, and controls the output pressure of oxygen by adjusting the opening of the internal valve core, so that the oxygen pressure can be precisely adjusted to the optimal pressure value required for combustion, ensuring that the combustion reaction takes place in a suitable pressure environment; the first solenoid valve 11 is installed on the connecting pipeline between oxygen source 9 and combustion furnace, and controls the opening and closing state of the valve core by the on and off state of the solenoid coil, realizing precise control of the gas path between the main oxygen supply line and combustion furnace. It opens when oxygen needs to be charged to the combustion furnace, and closes when oxygen charging is completed or during combustion, ensuring the timeliness and safety of oxygen supply.

[0033] In one embodiment, the quantitative oxygen supply system includes a second solenoid valve 12, a third solenoid valve 13, a speed regulating valve 15, and a supplementary gas tank 16. One end of the supplementary gas tank 16 is connected to the combustion furnace, and the other end is connected to the main oxygen supply line. The second solenoid valve 12 is installed on the connecting pipeline between the supplementary gas tank 16 and the combustion furnace, and the third solenoid valve 13 and the speed regulating valve 15 are installed on the connecting pipeline between the supplementary gas tank 16 and the main oxygen supply line.

[0034] It should be noted that the supplementary gas tank 16, as the core gas storage unit of the system, is connected to the combustion furnace at one end via a connecting pipe equipped with a second solenoid valve 12. This solenoid valve acts as a switch for oxygen supplementation during the combustion stage, opening when oxygen supplementation is needed to allow the pre-stored oxygen in the tank to flow into the combustion zone. The other end is connected to the main oxygen supply line via a connecting pipe equipped with a third solenoid valve 13 and a speed regulating valve 15. The third solenoid valve 13 is responsible for opening during the initial oxygen filling stage before combustion, allowing oxygen from the main gas line to enter and fill the supplementary gas tank 16 to complete the pre-storage of a fixed amount of oxygen. The speed regulating valve 15 is connected in series in this pipe, generating local resistance by changing the flow channel orifice diameter, thereby precisely regulating the oxygen flow rate entering the supplementary gas tank 16, ensuring a smooth and controllable filling process, and avoiding pressure shocks.

[0035] In one embodiment, the speed regulating valve 15 is disposed on the connecting pipeline between the third solenoid valve 13 and the second chamber, and is capable of regulating the oxygen flow rate entering the second chamber.

[0036] It should be noted that the speed control valve 15 is precisely positioned on the connecting pipeline between the third solenoid valve 13 and the second chamber, forming an oxygen flow control link from the main oxygen supply line to the second chamber. By adjusting the opening of the internal valve core, the speed control valve 15 can precisely control the oxygen flow rate entering the second chamber after flowing out of the third solenoid valve 13. By controlling the oxygen flow rate and total amount entering the second chamber, the pressure change rate in the second chamber is indirectly controlled, thereby affecting the piston movement speed. Ultimately, this achieves precise adjustment of the oxygen supply rate from the first chamber to the combustion zone, ensuring the stability and controllability of oxygen supply during combustion.

[0037] In one embodiment, the supplementary gas tank 16 is a piston-type gas tank, which is divided by a piston to form a first chamber and a second chamber that are not connected to each other; the first chamber is connected to the combustion zone of the combustion furnace through a connecting pipe, and the second chamber is connected to the oxygen source 9 through a connecting pipe.

[0038] It should be noted that the internal gas tank is divided into two completely independent and non-communicating chambers, a first chamber and a second chamber, by an internally sliding piston, thus separating the functions of oxygen storage and power drive. The first chamber is directly connected to the combustion zone of the combustion furnace through a connecting pipe, and is specifically used to store a fixed amount of oxygen before combustion and to accurately deliver this oxygen to the combustion zone during combustion. The second chamber is connected to the oxygen source 9 through a connecting pipe, and is used to access high-pressure oxygen to drive the piston to move. When it is necessary to replenish oxygen to the combustion zone, high-pressure oxygen is introduced into the second chamber, pushing the piston towards the first chamber, thereby squeezing out the fixed amount of oxygen stored in the first chamber and realizing the fixed amount of oxygen supply to the combustion zone.

[0039] In one embodiment, the system further includes a control system, which is connected to the pressure sensor 8, the first solenoid valve 11, the second solenoid valve 12, the third solenoid valve 13, the fourth solenoid valve 14 and the ignition device 7, and is able to control each component to work together according to a preset program.

[0040] It should be noted that the control system precisely controls the on / off state of each solenoid valve and the start-up timing of the ignition device 7 based on the pressure information fed back by the pressure sensor 8 and the preset timing logic. This enables the automated and coordinated operation of various stages such as oxygen charging, pressure monitoring, ignition control, oxygen replenishment, and gas analysis throughout the combustion process. This ensures that the entire combustion analysis process proceeds in an orderly manner according to the predetermined procedure, thereby improving the automation level and operational reliability of the system.

[0041] In one embodiment, the furnace body 1 of the combustion furnace is further provided with a crucible 3 support, and the crucible 3 is placed on the crucible 3 support; and the height of the crucible 3 support is adapted to the position of the ignition device 7.

[0042] It should be noted that the crucible 3 is placed on the crucible 3 support, and the support helps the crucible 3 to be in the optimal combustion position in the combustion furnace. The height of the crucible 3 support is carefully designed to match the position of the ignition device 7 on the furnace cover 2, ensuring that the ignition device 7 can be accurately aligned with the sample in the crucible 3 to achieve reliable ignition, while ensuring that the heat generated by combustion can be evenly distributed, thereby improving combustion efficiency and analytical accuracy.

[0043] In one embodiment, the oxygen pressure supplied to the combustion furnace through the main oxygen supply line before combustion is in the range of 0.1 MPa-1 MPa.

[0044] It should be noted that oxygen is introduced into the furnace through the main oxygen supply line, and the pressure of the introduced oxygen is precisely controlled within the range of 0.1 MPa to 1 MPa. This medium-low pressure setting can meet the oxygen concentration requirements for complete combustion of the sample, while avoiding the safety hazards and technical difficulties brought about by a high-pressure environment. By controlling the pressure within this range, the condensation problem caused by the increase in the condensation temperature of water (H element) under high pressure can be effectively solved, ensuring the accuracy of gas analysis after combustion. At the same time, the medium-low pressure environment has relatively low requirements for the pressure resistance of the equipment, reducing the equipment manufacturing cost and maintenance difficulty, and improving the reliability and safety of the system.

[0045] The working principle and usage method of a high-pressure combustion quantitative oxygen supply circuit device of this utility model are as follows:

[0046] This utility model provides a high-pressure combustion quantitative oxygen supply circuit device. The crucible 3 serves as the sample carrier, placed on a crucible 3 support inside the combustion furnace. The height of the crucible 3 support is matched to the position of the ignition device 7 on the furnace cover 2, ensuring precise ignition of the sample. The combustion furnace forms a sealed combustion space through a sealed connection between the furnace body 1 and the furnace cover 2, preventing gas leakage. The oxygen filling head 6 on the furnace cover 2 provides an access channel for the main oxygen supply circuit. The ignition device 7 is located directly above the crucible 3 to reliably ignite the sample. The gas replenishment port 5 on the side wall of the furnace body 1 provides access for the quantitative supplementary oxygen supply system. The analytical gas outlet 4 is controlled by a fourth solenoid valve 14 to export the post-combustion mixed gas to external analytical equipment. The main oxygen supply circuit provides the oxygen required for combustion from the oxygen source 9. After the output pressure is adjusted by the pressure regulating valve 10, the oxygen is discharged through the first solenoid valve 1. 1. Controlling the on / off state: Before combustion, oxygen is introduced into the combustion furnace. In the quantitative oxygen supply system, the piston-type supplementary gas tank 16 is divided into a first chamber and a second chamber that are not interconnected by a piston. The first chamber is used to pre-store a quantitative amount of oxygen and is connected to the combustion area. The second chamber is connected to the oxygen source 9. The third solenoid valve 13 controls the on / off state of the main oxygen supply line to the second chamber. The speed regulating valve 15 adjusts the oxygen flow rate into the second chamber to control the piston movement speed, thereby pushing the quantitative amount of oxygen in the first chamber to supplement the combustion area through the second solenoid valve 12 and the connecting pipeline. The pressure sensor 8 detects the pressure change in the combustion furnace in real time and feeds back the signal. The control system is connected to the pressure sensor 8, each solenoid valve and the ignition device 7, and controls the coordinated work of each component according to the preset program to ensure that the entire combustion analysis process is carried out in an orderly manner.

[0047] In use, first open the furnace cover 2, which is sealed to the combustion furnace, place the sample to be tested into the crucible 3, and then place the crucible 3 on the crucible 3 support inside the furnace body 1, which is adapted to the height of the ignition device 7. Close the furnace cover 2 to form a sealed combustion space. Then, the first solenoid valve 11 of the main oxygen supply circuit is opened through the control system. After the pressure of the oxygen source 9 is adjusted by the pressure regulating valve 10, oxygen is injected into the internal cavity of the combustion furnace through the oxygen filling head 6 of the furnace cover 2. At the same time, oxygen is pre-stored in the first chamber of the piston-type supplementary oxygen tank 16 in the quantitative supplementary oxygen supply system until the pressure sensor 8 detects that the pressure inside the furnace has reached the set range. The control system then closes the first solenoid valve 11 to complete the pre-oxygenation. Confirm that all solenoid valves are closed. After closing, the control system activates the ignition device 7 directly above the furnace cover 2 to ignite the sample. During combustion, the control system opens the third solenoid valve 13 and the speed control valve 15, allowing oxygen to enter the second chamber of the supplementary gas tank 16 and push the piston. The pre-stored quantitative oxygen in the first chamber is then transported to the combustion area through the second solenoid valve 12 and the gas supply port 5 of the furnace body 1 to supplement the oxygen. After the oxygen is replenished, the relevant solenoid valves are closed. After the sample combustion is completed and the mixed gas in the furnace is uniform, the control system opens the fourth solenoid valve 14 of the analytical gas outlet 4 to export the combusted gas to the external analytical equipment. After the analysis is completed, the fourth solenoid valve 14 is closed, the furnace cover 2 is opened, and the crucible 3 is taken out, completing the single-use process.

[0048] Finally, it should be noted that the above description is only a preferred embodiment of this utility model and is used only to illustrate the technical solution of this utility model, and is not intended to limit the protection scope of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model are included within the protection scope of this utility model.

[0049] In the description of this utility model, it should be understood that the terms "upper", "lower", "upper end", "lower end", "upper surface", "lower surface", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0050] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

Claims

1. A high-pressure combustion metered oxygen supply circuit device; characterized in that, include: The system comprises a crucible (3), a combustion furnace, a main oxygen supply line, and a quantitative oxygen supply system. The crucible (3) is placed inside the combustion furnace to hold the sample to be tested. The main oxygen supply line is connected to the internal cavity of the combustion furnace to fill the combustion furnace with oxygen before combustion. The quantitative oxygen supply system includes a supplementary gas tank (16) and a connecting pipeline. The supplementary gas tank (16) is connected to the interior of the combustion furnace through the connecting pipeline, and its outlet is located in the combustion area where the crucible (3) is located. The quantitative oxygen supply system can replenish the combustion area with a quantitative amount of oxygen pre-stored in the supplementary gas tank (16) during the sample combustion process.

2. The high-pressure combustion metered oxygen supply circuit device as described in claim 1, characterized in that: The combustion furnace includes a sealed furnace body (1) and a furnace cover (2). The furnace cover (2) is provided with an oxygen charging head (6) and an ignition device (7). The main oxygen supply line is connected to the internal cavity of the combustion furnace through the oxygen charging head (6). The ignition device (7) is located on the furnace cover (2) directly above the crucible (3) and can ignite the sample to be tested. The side wall of the furnace body (1) is provided with an analytical gas outlet (4) and a gas replenishment port (5). The quantitative oxygen replenishment system is connected to the internal cavity of the combustion furnace through the gas replenishment port (5). The analytical gas outlet (4) is connected to external analytical equipment, and a fourth solenoid valve (14) is provided on its connecting pipeline.

3. The high-pressure combustion metered oxygen supply circuit device as described in claim 2, characterized in that: The furnace cover (2) is also equipped with a pressure sensor (8), which can detect pressure changes inside the combustion furnace in real time.

4. The high-pressure combustion metered oxygen supply circuit device as described in claim 2, characterized in that: The main oxygen supply circuit includes an oxygen source (9), a pressure regulating valve (10), and a first solenoid valve (11). The oxygen source (9) provides the oxygen required for combustion of the device. The pressure regulating valve (10) is installed on the oxygen source (9) and can regulate the pressure of the output oxygen. The first solenoid valve (11) is installed on the connecting pipeline between the oxygen source (9) and the combustion furnace and can control the on / off connection between the main oxygen supply circuit and the combustion furnace.

5. The high-pressure combustion metered oxygen supply circuit device as described in claim 2, characterized in that: The quantitative supplemental oxygen supply system includes a second solenoid valve (12), a third solenoid valve (13), a speed regulating valve (15), and a supplemental gas tank (16). One end of the supplemental gas tank (16) is connected to the combustion furnace, and the other end is connected to the main oxygen supply line. The second solenoid valve (12) is installed on the connecting pipeline between the supplemental gas tank (16) and the combustion furnace. The third solenoid valve (13) and the speed regulating valve (15) are installed on the connecting pipeline between the supplemental gas tank (16) and the main oxygen supply line.

6. The high-pressure combustion metered oxygen supply circuit device as described in claim 5, characterized in that: The supplementary gas tank (16) is a piston-type gas tank, which is divided by a piston to form a first chamber and a second chamber that are not connected to each other; the first chamber is connected to the combustion zone of the combustion furnace through a connecting pipe, and the second chamber is connected to the oxygen source (9) through a connecting pipe.

7. The high-pressure combustion metered oxygen supply circuit device as described in claim 6, characterized in that: The speed control valve (15) is installed on the connecting pipeline between the third solenoid valve (13) and the second chamber, and can regulate the oxygen flow rate entering the second chamber.

8. The high-pressure combustion metered oxygen supply circuit device as described in claim 5, characterized in that: It also includes a control system, which is connected to the pressure sensor (8), the first solenoid valve (11), the second solenoid valve (12), the third solenoid valve (13), the fourth solenoid valve (14) and the ignition device (7) and can control each component to work together according to a preset program.

9. The high-pressure combustion metered oxygen supply circuit device as described in claim 2, characterized in that: The furnace body (1) of the combustion furnace is also provided with a crucible (3) support, and the crucible (3) is placed on the crucible (3) support; and the height of the crucible (3) support is adapted to the position of the ignition device (7).

10. The high-pressure combustion metered oxygen supply circuit device as described in claim 1, characterized in that: The oxygen pressure range of the combustion furnace before combustion is 0.1MPa-1MPa, which is supplied through the main oxygen supply line.

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