Nitrogen oxide testing device
By designing quantitative and pretreatment components, the problems of gas flow and impurities in traditional nitrogen oxide testing devices were solved, achieving precise control of gas mixing ratio and purity, and ensuring the accuracy and repeatability of experimental results.
Patent Information
- Application Number
- CN202520240037.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-16
- Publication Date
- 2025-12-05
- Estimated Expiration
- 2035-02-16
AI Technical Summary
Traditional nitrogen oxide testing equipment has difficulty in accurately controlling the flow rate of each gas in the gas supply stage, making it impossible to stably reproduce diverse experimental conditions. This results in large deviations in experimental results and insufficient data reliability. Furthermore, impurities in the gas interfere with chemical reactions and corrode the equipment.
A nitrogen oxide testing device was designed, comprising a quantitative component and a pretreatment component. The quantitative component achieves precise control of the gas ratio through a gas flow regulating valve and a control panel. The pretreatment component removes impurities through activated carbon and molecular sieves, and an electric heating coil provides preheating to ensure gas purity and temperature consistency.
It achieves precision and purity in gas mixing ratio, ensuring the accuracy and repeatability of experimental results, broadening the application range of the device, and avoiding interference from impurities and equipment corrosion.
Smart Images
Figure CN223628385U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to environmental science and engineering technical field, especially relate to a nitrogen oxide testing device. BACKGROUND
[0002] Nitrogen oxide as the key component of atmospheric pollutants, plays an important role in acid rain formation, photochemical smog induction and haze aggravation and other environmental problems, therefore, in-depth study of various properties of nitrogen oxide, reaction mechanism, for effective prevention and control of air pollution is extraordinary, the corresponding test device is essential.
[0003] The traditional nitrogen oxide testing device has many limitations, in the gas supply link, it is difficult to accurately control the flow of each gas, and it is impossible to stably reproduce various experimental conditions, since nitrogen oxide related experiments often need to mix nitrogen, oxygen, nitric oxide, nitrogen dioxide and other gases in a specific ratio, ordinary devices rely on simple valve control, which cannot meet the stringent requirements of high-precision experiments on the accuracy of gas ratio, resulting in large experimental result deviation and insufficient data reliability, and the existence of impurities in the gas not only interferes with the normal development of chemical reactions, but also may erode experimental equipment, greatly affecting the stability and repeatability of the experiment.
[0004] Therefore, a nitrogen oxide testing device is proposed. UTILITY MODEL CONTENTS
[0005] The utility model aims at providing a nitrogen oxide testing device, which can solve the problems of the existing nitrogen oxide testing device, such as many limitations, difficulty in accurately controlling the flow of each gas in the gas supply link, inability to stably reproduce various experimental conditions, and the like, since nitrogen oxide related experiments often need to mix nitrogen, oxygen, nitric oxide, nitrogen dioxide and other gases in a specific ratio, ordinary devices rely on simple valve control, which cannot meet the stringent requirements of high-precision experiments on the accuracy of gas ratio, resulting in large experimental result deviation and insufficient data reliability, and the existence of impurities in the gas not only interferes with the normal development of chemical reactions, but also may erode experimental equipment, greatly affecting the stability and repeatability of the experiment.
[0006] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: a nitrogen oxide testing device, comprising a base, a reaction kettle is fixedly connected to the middle part of the top of the base, and an exhaust pipe is fixedly communicated with the front side of the reaction kettle, gantry frames are fixedly connected to the two sides of the top of the base, a quantitative assembly is arranged in the interior of the gantry frame, a pretreatment assembly is arranged at the bottom of the quantitative assembly, and the pretreatment assembly comprises a mixing cavity;
[0007] The quantitative assembly includes a mounting plate, a plurality of gas cylinders are arranged in the mounting plate, the bottoms of the gas cylinders are fixedly connected with a conveying pipe, the other end of the conveying pipe is fixedly connected with a mixing cavity, a gas flow regulating valve is arranged on the surface of the conveying pipe, a control panel is arranged on the right side of the gantry, and the gas flow regulating valve is electrically connected with the control panel.
[0008] Preferably, the first moving frame and the second moving frame are slidably connected in the mixing cavity, and the first moving frame is located above the second moving frame; the first moving frame is internally provided with activated carbon; and the second moving frame is internally provided with molecular sieve.
[0009] Preferably, the first moving frame and the second moving frame are externally fixedly connected with a matching plate, the matching plate is internally threadedly connected with a bolt, and the surface of the mixing cavity is provided with a connecting groove matched with the bolt.
[0010] Preferably, the bottom of the mixing cavity is fixedly connected with a guide pipe, the surface of the guide pipe is fixedly sleeved with a shell, the shell is internally provided with an electric heating coil pipe, and the electric heating coil pipe is wound on the surface of the guide pipe.
[0011] Preferably, the top of the mixing cavity is provided with a top cover, the inside of the top cover is provided with a through hole, and the through hole is matched with the guide pipe.
[0012] Preferably, the top of the top cover is provided with a matching groove, the surface of the guide pipe is fixedly sleeved with a sleeve ring, the bottom of the sleeve ring is provided with a sealing ring, and the sealing ring is matched with the matching groove.
[0013] Preferably, the top of the gantry is fixedly connected with an electric push rod, and the telescopic end of the electric push rod is fixedly connected with the top of the mounting plate.
[0014] Preferably, the electric push rod and the electric heating coil pipe are electrically connected with the control panel.
[0015] Compared with the prior art, the application has the following beneficial effects:
[0016] 1. The quantitative assembly can uniformly mix different gases in different gas cylinders in the mixing cavity according to a preset accurate proportion, lays a foundation for reproducing accurate and stable reaction conditions for nitrogen oxide related experiments, effectively avoids experimental result deviation caused by gas proportion deviation, and can easily cope with various complex nitrogen oxide experiment scenes, whether it is a low-concentration nitrogen oxide reaction in a simulated atmospheric environment or a high-concentration reaction working condition in a simulated industrial waste gas, and can rely on the accurate quantitative assembly to accurately adjust the gas composition and flow, thereby widening the application range of the device.
[0017] 2, The application can greatly remove various impurities in the gas through the setting of the pretreatment assembly, transport high-purity gas for subsequent nitrogen oxide experiments, avoid the interference of impurities on the reaction process, guarantee the accuracy of the experimental results, and can provide stable and accurate preheating for the mixed gas entering the reaction kettle, so that the mixed gas reaches the accurate preset temperature when entering the reaction kettle, ensures the consistency of the reaction starting conditions, and makes the experimental data more reliable and repeatable. BRIEF DESCRIPTION OF DRAWINGS
[0018] Figure 1 It is the overall structure diagram of the nitrogen oxide test device of the utility model;
[0019] Figure 2 It is the structure schematic view of the quantitative assembly of the utility model;
[0020] Figure 3 It is the structure schematic view of the pretreatment assembly of the utility model;
[0021] Figure 4 It is the utility model Figure 1 It is the enlarged schematic view of A in the utility model;
[0022] Figure 5 It is the enlarged schematic view of B in the utility model. Figure 3
[0023] In the drawing, 1, base; 2, reaction kettle; 3, exhaust pipe; 4, gantry; 5, quantitative assembly; 501, mounting plate; 502, gas cylinder; 503, conveying pipe; 504, gas flow regulating valve; 6, pretreatment assembly; 601, mixing cavity; 602, first moving frame; 603, second moving frame; 604, lamination plate; 605, guide pipe; 606, shell; 607, electric heating coil; 7, control panel; 8, bolt; 9, connecting groove; 10, top cover; 11, through hole; 12, matching groove; 13, collar; 14, electric push rod. DETAILED DESCRIPTION
[0024] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.
[0025] Please refer to Figures 1-5 The utility model provides technical scheme:
[0026] The nitrogen oxide testing device comprises a base 1, a reaction kettle 2 fixedly connected to the middle of the top of the base 1, an exhaust pipe 3 fixedly communicated with the front side of the reaction kettle 2, gantry frames 4 fixedly connected to the two sides of the top of the base 1, a quantitative assembly 5 arranged in the interior of the gantry frame 4, a pretreatment assembly 6 arranged at the bottom of the quantitative assembly 5, and the pretreatment assembly 6 comprises a mixing cavity 601.
[0027] The quantitative assembly 5 comprises a mounting plate 501, a plurality of gas cylinders 502 arranged in the interior of the mounting plate 501, a conveying pipe 503 fixedly communicated with the bottom of the gas cylinder 502, the other end of the conveying pipe 503 fixedly communicated with the mixing cavity 601, a gas flow regulating valve 504 arranged on the surface of the conveying pipe 503, a control panel 7 arranged on the right side of the gantry frame 4, and the gas flow regulating valve 504 electrically connected with the control panel 7.
[0028] In the embodiment, the gas cylinders 502 are used as storage containers of various gases, and store the gases required by the experiment, such as nitrogen, oxygen, nitric oxide and nitrogen dioxide. When the experiment is started, the gases in the gas cylinders 502 flow to the mixing cavity 601 along the conveying pipe 503 fixedly communicated with the bottom under the action of the self-pressure, and the conveying pipe 503 builds a gas transmission path between the gas cylinders 502 and the mixing cavity 601, thereby providing a material basis for subsequent mixing and reaction. The gas flow regulating valve 504 can receive the electrical signal instruction from the control panel 7, and accurately adjust the valve opening degree by relying on the built-in electric or mechanical driving device, so that the flow area changes, thereby accurately controlling the gas flow rate, and enabling each gas to enter the mixing cavity 601 according to the preset flow rate, thereby ensuring that the gas mixing ratio is accurate and correct at all times.
[0029] Specifically, as shown in Figure 3 , the first moving frame 602 and the second moving frame 603 are slidably connected in the interior of the mixing cavity 601, and the first moving frame 602 is located above the second moving frame 603, the interior of the first moving frame 602 is provided with activated carbon, and the interior of the second moving frame 603 is provided with molecular sieve.
[0030] Specifically, as shown in Figure 3 , Figure 5 , the outer sides of the first moving frame 602 and the second moving frame 603 are fixedly connected with the cladding plates 604, the interiors of the cladding plates 604 are threadedly connected with the bolts 8, and the surface of the mixing cavity 601 is provided with the connecting grooves 9 matched with the bolts 8.
[0031] Specifically, as shown in Figure 3 , the bottom of the mixing cavity 601 is fixedly communicated with the conduit 605, the surface of the conduit 605 is fixedly sleeved with the shell 606, the interior of the shell 606 is provided with the electric heating coil 607, and the electric heating coil 607 is wound on the surface of the conduit 605.
[0032] In the embodiment, through the above setting, when the mixed gas enters the mixing cavity 601, it first contacts the activated carbon in the first moving frame 602. The activated carbon has a highly developed pore structure, and according to the principle of physical adsorption, macromolecular organic impurities, oil and other pollutants will be captured by the activated carbon pores, completing the preliminary purification. Subsequently, the gas continues to descend and enters the second moving frame 603 containing molecular sieve. The molecular sieve has a regular and precise pore size and has selective adsorption of molecules of a specific size. It can adsorb water, small molecular acidic or basic gas and other impurities, so that relatively pure gas can be output. When the activated carbon in the first moving frame 602 is saturated or the molecular sieve in the second moving frame 603 loses its adsorption capacity, the operator only needs to use a tool to unscrew the bolt 8 to pull out the corresponding moving frame along the mixing cavity 601. After replacing the moving frame filled with activated carbon or molecular sieve, the bolt 8 is tightened and fixed, the purification function of the mixing cavity 601 can be quickly restored to ensure the continuous and stable operation of the gas purification process. Then the purified gas flows to the reaction kettle 2 through the conduit 605. When the electric heating coil 607 is connected to the power supply, the electric current passes through the coil with a certain resistance, and the electric energy is converted into heat energy, causing the temperature of the coil to rise. The conduit 605 is in close contact with the coil, and the heat is transferred from the high-temperature coil to the conduit 605 by heat conduction, so that the gas flowing through the inside of the conduit 605 can be transferred, thereby gradually increasing the temperature of the gas and achieving the effect of preheating the mixed gas.
[0033] Specifically, as shown in Figure 4 The top of the reaction kettle 2 is provided with a top cover 10, and a through hole 11 is formed in the inside of the top cover 10. The through hole 11 is used in cooperation with the conduit 605.
[0034] Specifically, as shown in Figure 4 A matching groove 12 is formed in the top of the top cover 10, and a sleeve ring 13 is fixedly sleeved on the surface of the conduit 605. The bottom of the sleeve ring 13 is provided with a sealing ring, and the sealing ring is used in cooperation with the matching groove 12.
[0035] In the embodiment, through the above setting, the conduit 605 can pass through the through hole 11 to make the pretreated mixed gas enter the reaction kettle 2 without any obstruction, providing materials for nitrogen oxide related reactions. When the conduit 605 is inserted into the through hole 11 of the top cover 10, the sleeve ring 13 will embed the sealing ring into the matching groove 12. During the experimental operation, the inside of the reaction kettle 2 may be in a high-pressure and high-temperature state. The sealing ring is elastically deformed under pressure and tightly fills the small gap between the matching groove 12 and the sleeve ring 13, forming a reliable sealing structure and eliminating the possibility of mixed gas leakage from the joint between the conduit 605 and the top cover 10. The pressure in the reaction kettle 2 is stable, preventing the composition and pressure of the reaction system from changing due to gas leakage, thereby avoiding interference with the accuracy of the experimental results.
[0036] Specifically, as shown in Figure 1 The top of the gantry 4 is fixedly connected with an electric push rod 14, and the telescopic end of the electric push rod 14 is fixedly connected with the top of the mounting plate 501.
[0037] Specifically, as shown in Figure 1 , Figure 3 The electric push rod 14 and the electric heating coil 607 are electrically connected with the control panel 7.
[0038] In this embodiment: by arranging the electric push rod 14, the electric push rod 14 can drive the mounting plate 501 to descend, facilitating the operator to install, check or replace the gas cylinder 502, and making the operation space more open during daily maintenance, while the mounting plate 501 can be lifted to an appropriate height, ensuring smooth connection of the gas cylinder 502 and the lower conveying pipe 503, maintaining a stable gas conveying height difference, and ensuring that the gas flows into the mixing chamber 601 by relying on an appropriate pressure difference, by arranging the control panel 7, the control panel 7 can integrate multiple key operations on the same interface, and the operator only needs to input instructions on the control panel 7 to synchronously control the extension of the electric push rod 14 and the heating power of the electric heating coil 607, greatly simplifying the operation process and improving the use convenience.
[0039] Working principle: when the test is carried out, the gas in the gas cylinder 502 flows to the mixing chamber 601 through the bottom conveying pipe 503 under the action of its own pressure, the gas flow regulating valve 504 can be adjusted to accurately control the gas flow, so that different gases are gathered in the mixing chamber 601 according to the preset ratio to realize accurate quantitative gas distribution, then the gas enters the mixing chamber 601, first contacts the first moving frame 602, and the first moving frame 602 adsorbs impurities such as oil, macromolecular organic matter and the like in the gas, then the gas enters the second moving frame 603, and the molecular sieve in the second moving frame 603 adsorbs water, small-molecule acidic or alkaline gas and the like in the gas, so as to complete the purification of the gas, and the purified gas flows into the conduit 605, the electric heating coil 607 wound on the surface of the conduit 605 generates heat, the heat is transmitted to the conduit 605 and the internal gas through heat conduction, so as to increase the temperature of the gas, then the electric push rod 14 drives the mounting plate 501 and the conduit 605 to move downward, the conduit 605 is inserted into the through hole 11 of the top cover 10 with the sleeve ring 13, in the process of insertion, the sleeve ring 13 is embedded in the matching groove 12, and the sealing ring is deformed under extrusion, so as to seal the joint, then the mixed gas reacts with the catalyst in the reaction kettle 2, after the reaction is completed, the waste gas or the remaining gas which is not completely reacted is discharged through the exhaust pipe 3.
[0040] It should be noted that the specific structure, working principle and use method of the gas flow regulating valve and the electric heating coil in the present application are all mature technologies, and therefore are not described in detail herein.
[0041] The above merely describes the preferred embodiments of the present application, and is not intended to limit the present application, and any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims
1. A nitrogen oxide test device comprising a base (1), characterised in that: The middle part of the top of the base (1) is fixedly connected with a reaction kettle (2), and the front side of the reaction kettle (2) is fixedly connected with an exhaust pipe (3); both sides of the top of the base (1) are fixedly connected with a portal frame (4); the inside of the portal frame (4) is provided with a quantitative assembly (5); the bottom of the quantitative assembly (5) is provided with a pretreatment assembly (6); the pretreatment assembly (6) comprises a mixing cavity (601). The quantitative assembly (5) comprises a mounting plate (501), the inside of the mounting plate (501) is provided with a plurality of gas cylinders (502), the bottom of the gas cylinder (502) is fixedly connected with a conveying pipe (503), the other end of the conveying pipe (503) is fixedly connected with the mixing cavity (601), the surface of the conveying pipe (503) is provided with a gas flow regulating valve (504), the right side of the portal frame (4) is provided with a control panel (7), and the gas flow regulating valve (504) and the control panel (7) are electrically connected.
2. A device for testing nitrogen oxides according to claim 1, characterized in that: The inside of the mixing cavity (601) is slidably connected with a first moving frame (602) and a second moving frame (603), and the first moving frame (602) is located above the second moving frame (603); the inside of the first moving frame (602) is provided with activated carbon, and the inside of the second moving frame (603) is provided with molecular sieve.
3. A device for testing nitrogen oxides according to claim 2, characterized in that: The outside of the first moving frame (602) and the second moving frame (603) is fixedly connected with a matching plate (604), the inside of the matching plate (604) is threadedly connected with a bolt (8), and the surface of the mixing cavity (601) is provided with a connecting groove (9) matched with the bolt (8).
4. A device for testing nitrogen oxides according to claim 1, characterized in that: The bottom of the mixing cavity (601) is fixedly connected with a guide pipe (605), the surface of the guide pipe (605) is fixedly sleeved with an outer shell (606), the inside of the outer shell (606) is provided with an electric heating coil (607), and the electric heating coil (607) is wound on the surface of the guide pipe (605).
5. A device for testing nitrogen oxides according to claim 1, characterized in that: The top of the reaction kettle (2) is provided with a top cover (10), the inside of the top cover (10) is provided with a through hole (11), and the through hole (11) is matched with the guide pipe (605).
6. A device for testing nitrogen oxides according to claim 5, characterized in that: The top of the top cover (10) is provided with a matching groove (12), the surface of the guide pipe (605) is fixedly sleeved with a sleeve ring (13), the bottom of the sleeve ring (13) is provided with a sealing ring, and the sealing ring is matched with the matching groove (12).
7. A device for testing nitrogen oxides according to claim 4, characterized in that: The top of the portal frame (4) is fixedly connected with an electric push rod (14), and the telescopic end of the electric push rod (14) is fixedly connected with the top of the mounting plate (501).
8. A device for testing nitrogen oxides according to claim 7, characterized in that: The electric push rod (14) and the electric heating coil (607) are electrically connected with the control panel (7).