LEL rapid online detection device

Abstract

The utility model discloses a kind of LEL rapid online detection device, including access end, pretreatment device, lead-out pipeline and acceleration mechanism, wherein, access end is communicated with pretreatment device by introduction pipeline;Pretreatment device, including detector and the inlet pipeline and discharge pipeline on detector, inlet pipeline is connected with introduction pipeline;Acceleration mechanism, including acceleration pipeline, jet device and connecting pipeline, wherein, acceleration pipeline is connected with discharge pipeline;Jet device is also provided on acceleration pipeline, wherein, jet device is connected with inlet pipeline by connecting pipeline.The utility model solves the problem of long detection time, detection data lag and other problems caused by long distance of lead pipe and long pretreatment pipeline during waste gas online detection process;It improves the flow rate of waste gas in lead pipe, greatly shortens the time of waste gas introduction, provides the timeliness and effectiveness of detection data;It does not occupy large area, and avoids the situation that airflow speed is unstable due to the increase of pump power.

Description

Technical Field

[0001] This utility model relates to an online detection device, and more particularly to a rapid online LEL detection device, belonging to the field of energy-saving and environmental protection equipment technology. Background Technology

[0002] In the field of online monitoring of environmental exhaust gas, online monitoring devices generally require a pretreatment device. This device introduces the exhaust gas in the main exhaust gas pipeline into the online monitoring instrument through a pipe and pre-treats the exhaust gas to be tested. The exhaust gas is then allowed to enter the monitoring instrument for testing only after it meets the inlet requirements of the online monitoring instrument. Otherwise, it may damage the online monitoring instrument.

[0003] However, adding a pretreatment device will prolong the residence time of the exhaust gas in the pipeline, causing the online detector to detect data in a delayed or untimely manner.

[0004] Currently, pretreatment devices for online monitoring instruments generally use pumps to pump exhaust gas into the instrument or inject compressed air via an ejector. While these methods are sufficient for short pipeline distances, they struggle to meet the required lead time when the distance is long or the lead time requirement is short, resulting in delayed data collection.

[0005] In safety-related testing, such as LEL online analyzers, data lag in online analyzers may result in high-concentration VOCs exhaust gas already entering the combustion system before the online analyzer has detected it, or even the exhaust gas to be tested not yet entering the online analyzer but still in the pretreatment device. High-concentration VOCs exhaust gas entering the combustion system is extremely dangerous and may cause the exhaust gas combustion equipment to overheat rapidly or explode.

[0006] In existing technologies, solutions to this problem include minimizing the length of the pipeline in the pretreatment device, increasing the power of the suction pump, or increasing the number of pumps to increase the gas flow rate of the waste gas to be tested in the inlet pipe. However, shortening the length of the inlet pipe before and after the pretreatment device and controlling it within a certain range is difficult to meet the requirements due to the limitations of the engineering site. Increasing the pump power has limited effect and will affect the online detector, resulting in large and unstable fluctuations in the intake pressure, affecting the test results, increasing investment costs, and making subsequent maintenance difficult. Summary of the Invention

[0007] The technical problem to be solved by this utility model is to provide a rapid online LEL detection device, which solves the problem of slow flow rate of exhaust gas in pipelines.

[0008] The technical problem to be solved by this utility model is achieved by the following technical solution:

[0009] This utility model provides a rapid online LEL detection device, including an access terminal, a preprocessing device, an output pipeline, and an acceleration mechanism, wherein...

[0010] The access terminal is connected to the pretreatment device via an inlet pipe;

[0011] The pretreatment device includes a detector and an inlet pipe and an outlet pipe on the detector, wherein,

[0012] The inlet pipe is connected to the outlet pipe;

[0013] The acceleration mechanism includes an acceleration pipe, an ejector, and a connecting pipe, wherein,

[0014] The acceleration pipeline is connected to the discharge pipeline;

[0015] The jet injector is also installed on the acceleration pipeline, wherein...

[0016] The jet injector is connected to the inlet pipe via a connecting pipe.

[0017] As a preferred embodiment of this utility model, a second flow meter is also provided on the connecting pipeline.

[0018] In a preferred embodiment of this invention, the acceleration pipeline of the acceleration mechanism is connected to a compressed air device at its distal end and is equipped with a third ball valve.

[0019] The acceleration pipeline is also equipped with a fourth ball valve and a pressure reducing valve, and is located before the ejector.

[0020] As a preferred embodiment of this utility model, the inlet pipeline is further provided with a first ball valve, a filter, and a first flow meter, wherein...

[0021] The connection point between the connecting pipe and the inlet pipe is located between the filter and the first flow meter.

[0022] In a preferred embodiment of this invention, the discharge pipe is connected to the lead-out pipe.

[0023] As a preferred embodiment of this utility model, the lead-out pipe is connected to the outlet end, and a second ball valve is also provided on the lead-out pipe.

[0024] The beneficial effects of this utility model are: it solves the problems of long detection time and delayed detection data caused by excessively long lead pipe distance and long pretreatment pipeline in the online detection of exhaust gas; it increases the flow rate of exhaust gas in the lead pipe, greatly shortens the time of exhaust gas introduction, and provides timely and effective detection data; it does not occupy a large area and avoids the situation of unstable airflow speed caused by increasing pump power. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of this utility model;

[0026] In the diagram: 1. Inlet; 11. Inlet pipe; 2. Pretreatment device; 21. Detector; 22. Inlet pipe; 221. First ball valve; 222. Filter; 223. First flow meter; 23. Outlet pipe; 3. Outlet pipe; 31. Second ball valve; 32. Outlet end; 4. Acceleration mechanism; 41. Acceleration pipe; 42. Third ball valve; 43. Fourth ball valve; 44. Pressure reducing valve; 45. Ejector; 46. Second flow meter; 47. Connecting pipe. Detailed Implementation

[0027] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0028] Example

[0029] like Figure 1 As shown, this embodiment provides a rapid online detection device for LEL, including an access end 1, a pretreatment device 2, an outlet pipe 3, and an acceleration mechanism 4. The access end 1 is connected to the pretreatment device 2 through an inlet pipe 11, and the exhaust gas sample introduced from the access end 1 can enter the pretreatment device 2.

[0030] Specifically, the pretreatment device 2 includes a detector 21 and an inlet pipe 22 and an outlet pipe 23 on the detector 21. The inlet pipe 22 is connected to the inlet pipe 11. The exhaust gas enters the detector 21 for detection, such as LEL detection.

[0031] The acceleration mechanism 4 includes an acceleration pipe 41, an ejector 45, and a connecting pipe 47. The acceleration pipe 41 is connected to the discharge pipe 23. Specifically, the acceleration pipe 41 is also equipped with an ejector 45, which is connected to the inlet pipe 22 through the connecting pipe 47. The compressed air introduced by the acceleration mechanism 4 flows into the inlet pipe 22 through the ejector 45 in the acceleration pipe 41, thereby pressurizing the gas in the inlet pipe 22, increasing the pressure and gas flow rate in the sample inlet pipe, and reducing the time of the waste gas to be tested in the inlet pipe.

[0032] A second flow meter 46 is also installed on the connecting pipe 47 to facilitate the detection of gas flow.

[0033] The acceleration pipeline 41 of the acceleration mechanism 4 is connected to a compressed air device at its far end and is equipped with a third ball valve 42. The acceleration pipeline 41 is also equipped with a fourth ball valve 43 and a pressure reducing valve 44, which are located before the ejector 45.

[0034] The inlet pipe 22 is also equipped with a first ball valve 221, a filter 222 and a first flow meter 223, wherein the connection point between the connecting pipe 47 and the inlet pipe 22 is located between the filter 222 and the first flow meter 223.

[0035] The discharge pipe 23 is connected to the lead-out pipe 3, and the gas that has been tested is discharged through the lead-out pipe 3. The lead-out pipe 3 is connected to the outlet 32, and a second ball valve 31 is also installed on the lead-out pipe 3.

[0036] Specifically, the exhaust gas sample enters the pretreatment device pipeline through the inlet pipe. Specifically, the exhaust gas enters the pretreatment device 2 through the inlet pipe 11, is filtered by the first ball valve 221 and filter 222 of the pretreatment device 2, and then enters the online detector 21 for detection through the rotor flow meter (first flow meter 223). After the detection is completed, it is discharged back into the exhaust gas pipeline (outlet pipe 3) through the sample outlet pipe (discharge pipe 23). Since the combustible gas lower explosive limit analyzer has time requirements for the detection data, there are requirements for the length of the inlet pipe, which is generally not available at the engineering project site.

[0037] In this embodiment, an acceleration mechanism 4 is also included. In order to increase the gas flow rate of the waste gas in the inlet pipe and enable it to reach the online detector for detection as soon as possible, the fast circuit includes ball valves (third ball valve 42, fourth ball valve 43), pressure reducing valve 44, ejector 45, jet pipeline (connecting pipeline 47), compressed air pipeline (acceleration pipeline 41), etc. Compressed air is ejected from the outlet of ejector 45 to form a high-speed jet, which increases the pressure and gas flow rate in the sample inlet pipeline (inlet pipeline 22) and reduces the time of the waste gas to be detected in the inlet pipe.

[0038] This invention solves the problems of long detection time and data lag caused by excessively long lead-in pipe distance and long pretreatment pipeline in online exhaust gas detection. It increases the flow velocity of exhaust gas in the lead-in pipe, greatly shortens the exhaust gas introduction time, and provides timely and effective detection data. It does not occupy a large area and avoids the instability of airflow velocity caused by increasing pump power. It increases the flow velocity of the gas to be detected in the lead-in pipe, improves the timeliness and accuracy of the detection results of the online detector, and the system process is simple, reducing the requirements for distance at the engineering site. By using compressed air to increase the flow velocity of the sample gas in the lead-in pipe, it reduces the lag time of detection data and provides time safety assurance for exhaust gas combustion equipment.

[0039] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments, and various changes and modifications can be made without departing from the spirit and scope of this utility model. All such changes and modifications fall within the scope of protection claimed by this utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A rapid online LEL detection device, characterized in that, It includes an access terminal (1), a pretreatment device (2), an outlet pipe (3), and an acceleration mechanism (4), wherein, The access terminal (1) is connected to the pretreatment device (2) through the inlet pipe (11); The pretreatment device (2) includes a detector (21) and an inlet pipe (22) and an outlet pipe (23) on the detector (21), wherein, The inlet pipe (22) is connected to the outlet pipe (11); The acceleration mechanism (4) includes an acceleration pipe (41), an ejector (45), and a connecting pipe (47), wherein, The acceleration pipeline (41) is connected to the discharge pipeline (23); The jet injector (45) is also provided on the acceleration pipeline (41), wherein, The jet injector (45) is connected to the inlet pipe (22) via a connecting pipe (47).

2. The LEL rapid online detection device according to claim 1, characterized in that, A second flow meter (46) is also installed on the connecting pipe (47).

3. The LEL rapid online detection device according to claim 1 or 2, characterized in that, The acceleration pipeline (41) of the acceleration mechanism (4) is connected at its far end to a compressed air device and is equipped with a third ball valve (42). The acceleration pipeline (41) is also equipped with a fourth ball valve (43) and a pressure reducing valve (44), which are located before the jet injector (45).

4. The LEL rapid online detection device according to claim 3, characterized in that, The inlet pipe (22) is also equipped with a first ball valve (221), a filter (222), and a first flow meter (223), wherein, The connection point between the connecting pipe (47) and the inlet pipe (22) is located between the filter (222) and the first flow meter (223).

5. The LEL rapid online detection device according to claim 1, characterized in that, The discharge pipe (23) is connected to the outlet pipe (3).

6. The LEL rapid online detection device according to claim 5, characterized in that, The outlet pipe (3) is connected to the outlet end (32), and a second ball valve (31) is also provided on the outlet pipe (3).

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