Multi-probe sampler and ammonia mixing uniformity testing system

Abstract

The utility model discloses a multi-probe sampler and an ammonia gas mixing uniformity testing system, and belongs to the technical field of diesel engine tail gas after-treatment. The multi-probe sampler comprises a shell and a plurality of sampling pipes, and one part of each sampling pipe extends into the shell and is used for collecting a gas sample. The shell is connected with other devices through the flange connecting seat, and the sampling pipe is quickly connected and detached through the quick connector. The multi-probe sampler is simple in structure and convenient to install and adjust, does not need to be supported by a power supply and compressed air, and reduces the use cost. The system can evaluate the mixing uniformity of ammonia gas by measuring the concentration of NH3 gas, and is widely applicable to tail gas treatment testing. According to the technical scheme, the working efficiency and the testing accuracy are improved, and the problems of equipment blockage and energy waste are reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of diesel engine tail gas aftertreatment, more particularly to a multi-probe sampler and ammonia gas mixing uniformity test system. BACKGROUND

[0002] The selective catalytic reduction (SCR) system of diesel engine is one of the key technologies for effectively reducing nitrogen oxides (NOx) emissions of diesel engine. In the SCR system, the mixing uniformity of urea injection and exhaust gas directly affects the conversion efficiency of SCR and the emission compliance. In order to ensure the smooth progress of the NOx reduction reaction, ammonia gas and exhaust gas in the SCR system need to be fully mixed to ensure uniform distribution of ammonia gas on the carrier surface. However, in the prior art, the mixing uniformity of ammonia gas is difficult to control, and often leads to poor mixing, resulting in the SCR system failing to achieve the ideal conversion efficiency.

[0003] Currently, the multi-probe position samplers used in the market usually rely on complex electronic control systems, which often face great difficulties during commissioning, especially in complex environments. The sampling tube is prone to blockage, leading to inaccurate sampling and even affecting the ammonia gas mixing uniformity test results of the entire SCR system. At the same time, the manufacturing and maintenance costs of these systems are high, and the utilization rate is low, which makes it difficult for enterprises to bring efficient economic benefits.

[0004] In addition, some sampling equipment designs have multiple switching valves, which are prone to failure during long-term operation, leading to inaccurate gas measurement and even possible equipment downtime maintenance. This not only increases the operating costs of enterprises, but also may affect the efficiency and accuracy of the entire experimental process. In summary, the existing technology has many limitations in the application of ammonia gas mixing uniformity test in the SCR system, and a simpler and more efficient sampling device is needed to solve these problems. UTILITY MODEL CONTENTS

[0005] The utility model provides a multi-probe sampler and ammonia gas mixing uniformity test system to overcome the technical problems in the prior art.

[0006] To solve the above technical problems, the technical scheme of the utility model is as follows:

[0007] A multi-probe sampler, the multi-probe sampler comprises a shell and a plurality of sampling tubes mounted on the shell, wherein:

[0008] The shell is cylindrical, comprising an open barrel mouth, a closed barrel bottom and a barrel wall;

[0009] The shell is provided with a flange connection seat at the barrel mouth, and the barrel wall of the shell is provided with an outlet;

[0010] Part of the sampling tube is located outside the shell and is connected with a quick connector, and another part of the sampling tube penetrates the barrel bottom into the inside of the shell.

[0011] Further, the barrel bottom of the shell is provided with a locking mechanism corresponding to the number of sampling tubes, and the locking mechanism comprises a base and a buckle, wherein:

[0012] The base is a hollow structure, and the base is fixedly connected to the outer surface of the barrel bottom, and the sampling tube penetrates the hollow part of the base and enters the inside of the shell;

[0013] The buckle is installed on the base, and the buckle is configured to lock and fix the sampling tube on the barrel bottom when the length of the sampling tube extending into the inside of the shell reaches a preset length.

[0014] Further, a plurality of sampling tubes are installed on the barrel bottom along a first direction, and a plurality of sampling tubes are parallel to each other;

[0015] One side of the barrel wall is provided with the outlet along a second direction, and the second direction is perpendicular to the first direction.

[0016] Further, the sampling tube is provided with a sampling port and a connecting port at the two ends, the sampling port is the port of one end of the sampling tube entering the inside of the shell, and the connecting port is the port of one end of the sampling tube located outside the shell.

[0017] The quick connector is installed on the connecting port, and the distance from the sampling port to the plane of the barrel bottom is greater than the distance from any point on the outlet to the plane of the barrel bottom.

[0018] Further, the sampling ports on a plurality of sampling tubes are divided into three groups, the first group of sampling ports is distributed along a first circumference, the second group of sampling ports is distributed along a second circumference, and the third group of sampling ports is distributed along a third circumference.

[0019] Further, the first circumference, the second circumference and the third circumference are three concentric circles arranged inside the shell near the barrel port, the diameter of the first circumference is less than that of the second circumference, and the diameter of the second circumference is less than that of the third circumference.

[0020] Further, the sampling ports are provided with 26 sampling ports, wherein:

[0021] The first circumference is uniformly distributed with 6 sampling ports;

[0022] The second circumference is uniformly distributed with 8 sampling ports;

[0023] The third circumference is uniformly distributed with 12 sampling ports.

[0024] An ammonia mixing uniformity test system is provided with a multi-probe sampler, wherein the multi-probe sampler is the multi-probe sampler described above.

[0025] Further, the ammonia mixing uniformity test system comprises, in sequence, an oxidation catalytic converter, a particulate trap, a urea nozzle, a first selective catalytic converter;

[0026] The barrel mouth of the multi-probe sampler is connected with the outlet of the first selective catalytic converter; the multi-probe sampler is further connected with a gas analyzer, which is configured to be connected with each quick connector on the multi-probe sampler in sequence to measure and analyze the gas in the sampling tube corresponding to each quick connector.

[0027] Further, a NO X sensor and a first temperature sensor are installed before the inlet of the oxidation catalytic converter;

[0028] A second temperature sensor is installed between the oxidation catalytic converter and the particulate trap; differential pressure sensors are connected with the inlet and outlet of the particulate trap;

[0029] A third temperature sensor is installed at the inlet of the first selective catalytic converter.

[0030] Compared with the prior art, the technical scheme of the utility model has the beneficial effects that:

[0031] The multi-probe sampler provided by the utility model has the advantages of simple structure, convenient installation and adjustment, accurate sampling, accurate testing, etc.; the system can realize efficient sampling and measurement of NH3 gas, and can perform multi-point analysis through the gas analyzer to evaluate the ammonia mixing uniformity; meanwhile, the application optimizes the distribution of sampling tubes and adds sensors for real-time monitoring, thereby improving the stability of equipment operation and the accuracy of experiments, reducing energy consumption and use cost, and greatly improving the test efficiency of tail gas treatment. BRIEF DESCRIPTION OF DRAWINGS

[0032] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced as follows; obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained according to these drawings without creative labor.

[0033] Figure 1 is a perspective structural schematic view of the multi-probe sampler provided in an embodiment of the application;

[0034] Figure 2 is another perspective view of the multi-probe sampler provided in an embodiment of the present application;

[0035] Figure 3 is a front view of the multi-probe sampler provided in an embodiment of the present application;

[0036] Figure 4 is a right view of the multi-probe sampler provided in an embodiment of the present application; Figure 3

[0037] Figure 5 is a perspective view of the ammonia mixing uniformity test system provided in an embodiment of the present application;

[0038] Marking in the figure:

[0039] 1, quick connector; 2, outlet; 3, shell; 4, sampling pipe; 5, flange connecting seat; 6, locking mechanism; 7, first circumference; 8, second circumference; 9, third circumference;

[0040] 11, NO X sensor; 12, first temperature sensor; 13, oxidation catalytic converter; 14, second temperature sensor; 15, particulate trap; 16, differential pressure sensor; 17, urea nozzle; 18, third temperature sensor; 19, first selective catalytic converter; 20, multi-probe sampler; 21, gas analyzer. DETAILED DESCRIPTION

[0041] In order to better understand the purpose, structure and function of the present application, the technical scheme of the present application will be further described in detail below in combination with the drawings and specific preferred embodiments.

[0042] In the description of the present application, it should be understood that the terms "left side", "right side", "upper part", "lower part" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and "first", "second" and the like do not represent the importance of the parts, therefore it cannot be understood as a limitation on the present application. The specific dimensions used in the embodiments are only for the purpose of illustrating the technical scheme and do not limit the protection scope of the present application. It is understandable that some well-known structures in the drawings and their descriptions may be omitted for those skilled in the art.

[0043] ​Unless otherwise clearly indicated and limited, the terms "mounting", "setting", "connecting", "fixing" and the like should be interpreted broadly, for example, can be fixed connection, can also be detachable connection, or integral; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be internal communication of two elements or interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0044] Embodiment 1:

[0045] As shown in Figures 1-2 The utility model provides a technical scheme:

[0046] A multi-probe sampler, the multi-probe sampler includes a shell 3 and several sampling tubes 4 installed on the shell 3, wherein:

[0047] The shell 3 is cylindrical, including an open barrel mouth, a closed barrel bottom and a barrel wall;

[0048] The shell 3 is provided with a flange connecting seat 5 at the barrel mouth, and the barrel wall of the shell 3 is provided with an outlet 2;

[0049] Part of the sampling tube 4 is located outside the shell 3 and is connected with a quick connector 1, and the other part of the sampling tube 4 penetrates the barrel bottom and enters the inside of the shell 3.

[0050] The existing electrically controlled position sampler is troublesome to install and debug, the sampling tube is easy to block, and the test efficiency and accuracy are affected. Moreover, it is expensive, has low utilization rate and high use cost. Now a simple sampler is used, which can be installed with different post-processing through a flange, the distance between the sampling tube 4 and the carrier is adjusted after installation, the working efficiency and test accuracy are greatly improved, and there is no need to use power and compressed air, thereby reducing unnecessary energy loss.

[0051] In summary, the multi-probe sampler in the embodiment has simple structure, convenient installation and debugging, avoids the problems of complex installation and debugging of traditional electrically controlled samplers and easy blocking of sampling tubes, and significantly improves the experimental efficiency and test accuracy. Through the flange connection design, the multi-probe sampler can be quickly adapted to different post-processing systems, the distance adjustment of the sampling tube is facilitated, and the operation process is greatly simplified. In addition, the sampler does not depend on power and compressed air, reduces energy consumption, is suitable for various working conditions, and has high economic efficiency and practicality.

[0052] Embodiment 2:

[0053] On the basis of embodiment 1, reference is made to Figures 1-4The bottom of the shell 3 is provided with a locking mechanism 6 corresponding to the number of sampling tubes 4, which comprises a base and a buckle, wherein:

[0054] The base is a hollow structure and is fixedly connected to the outer surface of the bottom, and the sampling tube 4 enters the inside of the shell 3 through the hollow part of the base;

[0055] The buckle is installed on the base and is configured to lock and fix the sampling tube 4 on the bottom when the length of the sampling tube 4 extending into the inside of the shell 3 reaches a preset length.

[0056] Further, the sampling tubes 4 are all stainless steel tubes with an inner diameter of 6 mm and an outer diameter of 8 mm.

[0057] Further, the sampling tubes 4 are installed on the bottom along a first direction, and the sampling tubes 4 are parallel to each other.

[0058] The side of the barrel wall is provided with the outlet 2 along a second direction, and the second direction is perpendicular to the first direction.

[0059] Further, the sampling tube 4 is provided with a sampling port and a connecting port at the two ends, the sampling port is the port of one end of the sampling tube 4 entering the inside of the shell 3, and the connecting port is the port of one end of the sampling tube 4 located outside the shell 3.

[0060] The quick connector 1 is installed on the connecting port, and the distance from the sampling port to the bottom is greater than the distance from any point on the outlet 2 to the bottom.

[0061] Further, the sampling ports on the sampling tubes 4 are divided into three groups, the first group of sampling ports is distributed along a first circumference 7, the second group of sampling ports is distributed along a second circumference 8, and the third group of sampling ports is distributed along a third circumference 9.

[0062] Further, the first circumference 7, the second circumference 8 and the third circumference 9 are three concentric circles arranged inside the shell 3 near the barrel port, the diameter of the first circumference 7 is smaller than that of the second circumference 8, and the diameter of the second circumference 8 is smaller than that of the third circumference 9.

[0063] Further, the sampling ports are provided with 26 sampling ports in total, wherein:

[0064] The first circumference 7 is uniformly provided with 6 sampling ports;

[0065] The second circumference 8 is uniformly provided with 8 sampling ports;

[0066] The third circumference 9 is uniformly provided with 12 sampling ports.

[0067] On the basis of embodiment 1, this embodiment adds a locking mechanism to ensure that the sampling tube is stable in the predetermined position, further improving the accuracy and stability of sampling. The locking mechanism not only ensures the accurate fixing of the position of the sampling tube, but also can adjust the length of the sampling tube entering the shell according to the needs, making the sampling more flexible. At the same time, the sampling tube made of stainless steel has high corrosion resistance and durability, which enhances the service life of the equipment. In addition, the sampling tubes are evenly distributed according to different circumferences, ensuring the comprehensiveness and representativeness of sampling.

[0068] Embodiment 3:

[0069] As shown in Figure 5 The utility model provides a technical scheme:

[0070] A kind of ammonia gas mixing uniformity test system, multiple probe samplers 20 are equipped in the ammonia gas mixing uniformity test system, and the multiple probe sampler 20 uses the multiple probe sampler described above.

[0071] Further, the ammonia gas mixing uniformity test system includes sequentially connected oxidation catalytic converter 13, particle trap 15, urea nozzle 17, first selective catalytic converter 19;

[0072] The oxidation catalytic converter 13 is connected with the exhaust port of engine or burner;

[0073] The urea nozzle 17 is to spray urea solution into the pipeline connected between particle trap 15 and first selective catalytic converter 19, and the urea solution is first decomposed into ammonia NH3 and carbon dioxide CO2 under high-temperature exhaust environment;The generated ammonia as reducing agent chemically reacts with nitrogen oxides NOx in exhaust, and NOx is reduced to harmless nitrogen N2 and water H2O, thereby effectively reducing harmful substances in emissions;

[0074] The barrel mouth of the multiple probe sampler 20 is connected with the outlet of the first selective catalytic converter 19;The multiple probe sampler 20 is further connected with a gas analyzer 21, and the gas analyzer 21 is configured to be connected with each quick connector 1 on the multiple probe sampler in sequence to measure and analyze the gas in the sampling tube 4 corresponding to each quick connector 1;

[0075] The gas analyzer 21 analyzes the gas in each sampling tube 4 respectively, obtains the concentration value of each component of the gas in each sampling tube 4;And according to the concentration value of each component of the gas in multiple sampling tubes 4, the distribution uniformity coefficient of NH3 at the front end of the first selective catalytic converter 19 is calculated.

[0076] Further, the sampling pipe 4 adjusts the distance from the rear end of the first selective catalytic converter 19 through the locking mechanism 6, and fixes the sampling pipe 4 through the locking mechanism 6 after the distance is adjusted.

[0077] The working principle of the system is that the exhaust gas is generated by the engine or the burner, the exhaust gas is oxidized by the oxidation catalytic converter 13, and then enters the particulate trap 15 for particulate filtration; the urea solution is sprayed into the system by the urea nozzle 17, the nitrogen oxides NOx are reduced by the first selective catalytic converter 19 to generate nitrogen and water; the multi-probe sampler 20 is installed at the rear end of the first selective catalytic converter 19, i.e. the rear end of SCR1, and is connected with the first selective catalytic converter 19 through the flange, for measuring the concentrations of NOx, NH3 and HNCO, and judging the uniformity of ammonia gas mixture. The various components of the system are connected through pipelines, and temperature sensors and differential pressure sensors are installed at different positions of the system to monitor the temperature and pressure, and ensure the accuracy of the system operation.

[0078] The ammonia gas mixture uniformity test system provided in the embodiment realizes effective measurement of the uniformity of ammonia gas mixture by combining the multi-probe sampler. The gas analyzer analyzes the gas components in the multi-point sampling pipe, and calculates the uniformity coefficient of ammonia gas distribution to accurately evaluate the ammonia gas mixture state. At the same time, the system adjusts the distance of the sampling pipe to realize flexible adaptability to the ammonia gas mixture state under different working conditions, and ensures the accuracy of the measurement results.

[0079] Embodiment 4:

[0080] On the basis of Embodiment 3, referring to Figure 5 , a NO X sensor 11 and a first temperature sensor 12 are installed before the inlet of the oxidation catalytic converter 13;

[0081] A second temperature sensor 14 is installed between the oxidation catalytic converter 13 and the particulate trap 15;

[0082] A differential pressure sensor 16 is connected to the inlet and outlet of the particulate trap 15, for detecting the gas pressure difference between the front and rear ends of the particulate trap 15, so as to monitor the working state and ash accumulation of the particulate trap 15;

[0083] A third temperature sensor 18 is installed at the inlet of the first selective catalytic converter 19.

[0084] The embodiment further optimizes the test system, realizes real-time monitoring on the system running state by increasing the NOx sensor, the temperature sensor and the pressure difference sensor.

[0085] Obviously, the above embodiments of the utility model are only examples for clearly illustrating the utility model, and are not a limitation on the embodiments of the utility model. For ordinary skilled in the art, other different forms of changes or variations can be made on the basis of the above description. Here, all the embodiments are not required to be exhausted. Any modification, equivalent replacement and improvement, etc. made within the spirit and principle of the utility model should be included in the protection scope of the utility model claim.

Claims

1. A multi-probe sampler, characterized in that: The multi-probe sampler comprises a housing (3) and a plurality of sampling tubes (4) mounted on the housing (3), wherein: The shell (3) is cylindrical and comprises an open cylinder mouth, a closed cylinder bottom and a cylinder wall; A flange connection seat (5) is provided at the barrel opening of the shell (3), and an outlet (2) is provided on the barrel wall of the shell (3); A portion of the sampling tube (4) is located outside the shell (3) and is connected to a quick connector (1), and another portion of the sampling tube (4) passes through the bottom of the cylinder and enters the interior of the shell (3).

2. The multi-probe sampler according to claim 1, characterized in that: The bottom of the housing (3) is provided with locking mechanisms (6) corresponding to the number of the sampling tubes (4), and the locking mechanisms (6) include a base and a buckle, wherein: The base is a hollow structure and is fixedly connected to the outer surface of the bottom of the cylinder. The sampling tube (4) passes through the hollow portion of the base and then enters the interior of the shell (3); The buckle is mounted on the base, and is configured to lock and fix the sampling tube (4) on the bottom of the cylinder when the length of the sampling tube (4) extending into the interior of the shell (3) reaches a preset length.

3. The multi-probe sampler according to claim 1, characterized in that: A plurality of sampling tubes (4) are installed on the bottom of the cylinder along a first direction, and the plurality of sampling tubes (4) are parallel to each other; The outlet (2) is opened on one side of the cylinder wall along a second direction, and the second direction is perpendicular to the first direction.

4. The multi-probe sampler according to claim 1, characterized in that: The sampling tube (4) is provided with a sampling port and a connecting port at both ends thereof, the sampling port being the port at one end of the sampling tube (4) entering the interior of the housing (3), and the connecting port being the port at one end of the sampling tube (4) located outside the housing (3); The quick connector (1) is installed on the connection port, and the distance from the sampling port to the plane where the cylinder bottom is located is greater than the distance from any point on the outlet (2) to the plane where the cylinder bottom is located.

5. The multi-probe sampler according to claim 4, characterized in that: The sampling ports on the plurality of sampling tubes (4) are divided into three groups, wherein the first group of sampling ports is distributed along a first circumference (7), the second group of sampling ports is distributed along a second circumference (8), and the third group of sampling ports is distributed along a third circumference (9).

6. The multi-probe sampler according to claim 5, characterized in that: The first circumference (7), the second circumference (8) and the third circumference (9) are three concentric circles arranged inside the shell (3) near the barrel mouth. The diameter of the first circumference (7) is smaller than that of the second circumference (8), and the diameter of the second circumference (8) is smaller than that of the third circumference (9).

7. The multi-probe sampler according to claim 5, characterized in that: There are 26 sampling ports in total, including: Six sampling ports are evenly distributed on the first circumference (7); Eight sampling ports are evenly distributed on the second circumference (8); Twelve sampling ports are evenly distributed on the third circumference (9).

8. An ammonia mixing uniformity testing system, characterized in that: The ammonia mixing uniformity test system is provided with a multi-probe sampler (20), and the multi-probe sampler (20) is the multi-probe sampler according to any one of claims 1 to 7.

9. The ammonia mixing uniformity testing system according to claim 8, characterized in that: The ammonia mixing uniformity test system comprises an oxidation catalytic converter (13), a particulate trap (15), a urea nozzle (17), and a first selective catalytic converter (19) connected in sequence; The mouth of the multi-probe sampler (20) is connected to the outlet of the first selective catalytic converter (19); the multi-probe sampler (20) is also connected to a gas analyzer (21), and the gas analyzer (21) is configured to be connected to each quick connector (1) on the multi-probe sampler in sequence to measure and analyze the gas in the sampling tube (4) corresponding to each quick connector (1).

10. The ammonia mixing uniformity testing system according to claim 9, characterized in that: A NO X sensor (11) and a first temperature sensor (12); A second temperature sensor (14) is installed between the oxidation catalytic converter (13) and the particulate trap (15), and a pressure difference sensor (16) is connected to the inlet and outlet of the particulate trap (15); A third temperature sensor (18) is installed at the inlet of the first selective catalytic converter (19).

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