Marine tail gas multi-component detection device

Abstract

The utility model relates to a gas detection device, in particular to a marine tail gas multi-component detection device which comprises a shell, the shell is composed of an upper shell and a lower shell which are correspondingly connected in a sealed mode, a plurality of gas inlet channels are formed in the upper shell, inlets of the gas inlet channels are all communicated with a gas inlet in the center of the upper shell, and the gas inlet channels are communicated with a gas outlet in the center of the lower shell. The outlets are respectively communicated with a plurality of corresponding gas detection chambers; a plurality of exhaust passages are correspondingly arranged in the lower shell, inlets of the plurality of exhaust passages are respectively communicated with the plurality of corresponding gas detection chambers, and outlets of the plurality of exhaust passages are communicated with an exhaust port in the center of the lower shell; and the plurality of gas detection chambers are respectively provided with sensors for detecting different gas components. The device is simple in structure, small in size, easy to operate, capable of simultaneously detecting multiple components in tail gas, and high in accuracy and reliability.

Description

Technical Field

[0001] The utility model relates to a gas detection device, in particular to a marine exhaust multi-component detection device. Background Art

[0002] The environmental pollution caused by ship transportation is becoming increasingly prominent. In order to implement the requirements of the Environmental Protection Law and the Air Pollution Prevention and Control Law, the Ministry of Environmental Protection has formulated the Emission Limits and Measurement Methods of Ship Engine Exhaust Pollutants (China Phase I and II). The Maritime Safety Administration often uses the method of boarding ships to extract fuel for testing to promote air pollution prevention and control. Later, it developed into drone aerial patrols, patrol boat water patrols, and electronic patrols, and the "sniffing method" for exhaust remote sensing. However, boarding detection has a lag and is inconvenient; the remote sensing method, which sniffs the gases emitted into the air, has accuracy issues.

[0003] With the increasing demand for multi-component detection of exhaust gas, it is necessary to detect multiple components in the exhaust gas at the same time. For example, Announcement No. 217385417U discloses a portable ship engine exhaust pollutant detection device, including a device body, a push handle is provided on one side of the device body, universal wheels are provided at the four corners of the lower wall of the device body, a detection chamber is provided inside the device body, an exhaust gas collection pipe extending from the outside of the device body is penetrated through the shell of one side of the detection chamber, a connector is connected to the end of the exhaust gas collection pipe, a piston plate is installed inside the detection chamber, a pneumatic telescopic rod and a cylinder are provided on the top of the piston plate, a detection probe is installed on the inner wall of the detection chamber, and an exhaust gas analyzer body is installed on the outer wall, and the signal output end of the detection probe is connected to the signal input end of the exhaust gas analyzer body.

[0004] In order to detect multiple components in exhaust gas, multiple sensors are required. However, if the analyzer that integrates multiple sensors is connected to the same exhaust gas pipe, and the sensors that detect different exhaust gas components are concentrated in one place for detection, other components produced by physical or chemical reactions occurring during detection by different sensors will affect the data detected by other sensors, interfere with each other, cause deviations in the test results, and directly affect the accuracy and reliability of the detection.

[0005] On the other hand, the public literature only introduces that the exhaust gas after detection should be treated before being discharged, but the exhaust gas remaining in the pipeline after each detection will affect the accuracy of the next detection. Summary of the invention

[0006] The purpose of the utility model is to solve the above technical problems and to provide a marine exhaust multi-component detection device which has a simple structure, a small size, is easy to operate, can detect multiple components in exhaust gas at the same time, and has high accuracy and reliability.

[0007] The utility model discloses a marine exhaust multi-component detection device, comprising a shell, wherein the shell is composed of an upper shell and a lower shell which are correspondingly sealed and connected, wherein a plurality of air intake channels are arranged in the upper shell, wherein the inlets of the plurality of air intake channels are all connected to the air intake port at the center of the upper shell, and the outlets are respectively connected to a plurality of corresponding gas detection chambers; wherein a plurality of exhaust channels are correspondingly arranged in the lower shell, wherein the inlets of the plurality of exhaust channels are respectively connected to a plurality of corresponding gas detection chambers, and the outlets are connected to the exhaust port at the center of the lower shell; and wherein the plurality of gas detection chambers are respectively provided with sensors for detecting different gas components.

[0008] The plurality of air inlet passages are uniformly arranged along the radial direction of the air inlet opening at the center of the upper shell; and the plurality of air exhaust passages are uniformly arranged along the radial direction of the air exhaust opening at the center of the lower shell.

[0009] The air inlet is connected to the tail gas inlet pipe via a vacuum pump.

[0010] The tail gas intake pipe is provided with an air intake port and a three-way valve.

[0011] The device also includes a controller connected to the display, and the input end of the controller is respectively connected to a plurality of sensors for detecting different gas components.

[0012] The output end of the controller is connected to a vacuum pump.

[0013] The output end of the controller is connected to a three-way valve.

[0014] Beneficial effects:

[0015] 1) In order to meet the need of detecting multiple components of exhaust gas, multiple sensors are arranged in different gas detection chambers, and the exhaust gas is evenly introduced into different gas detection chambers through multiple air inlet channels. Each gas detection chamber only detects a single component, and the detected gas is then discharged into the exhaust port through the exhaust channel. This not only meets the need to simultaneously detect multiple components in the exhaust gas, but also has the airways evenly distributed and different detectors placed in different gas detection chambers, which are independent of each other, do not interfere with each other, and produce accurate results. This avoids the problem of deviation in test results caused by derived gases when multiple sensors are concentrated in one place for detection, thereby ensuring the authenticity, accuracy and reliability of the data.

[0016] 2) Use a vacuum pump in conjunction with a three-way valve. When the vacuum pump is connected to the exhaust gas intake pipe, the exhaust gas can be pumped into the air inlet in the center of the upper shell. When the test is completed, connect the vacuum pump to the outside air to draw in air, clean the internal pipes of the shell, and remove the residual exhaust gas, which will not affect the accuracy of the next test.

[0017] 3) Multiple inlet and outlet channels and gas detection chambers are concentrated in the shell, which is small in size and easy to move and install. The shell consists of an upper shell and a lower shell, which is easy to assemble and maintain. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is the principle diagram of the utility model.

[0019] Figure 2 It is a schematic diagram of the upper shell structure.

[0020] Figure 3 It is a schematic diagram of the lower shell structure.

[0021] Figure 4 It is the overall installation diagram of the shell.

[0022] Among them, 1-upper shell, 2-lower shell, 3-intake channel, 4-exhaust channel, 5-intake port, 6-exhaust port, 7-gas detection chamber, 8-sensor, 9-exhaust intake pipe, 10-three-way valve, 11-vacuum pump, 12-display, 13-controller, 14-air inlet port. DETAILED DESCRIPTION

[0023] The utility model is further explained below in conjunction with the accompanying drawings:

[0024] See also Figure 2 and Figure 3 The shell body is composed of an upper shell body 1 and a lower shell body 2 which are correspondingly sealed and connected. A plurality of air inlet channels 3 (7 in this embodiment) are provided in the upper shell body 1. The inlets of the plurality of air inlet channels 3 are connected with the air inlet port 5 at the center of the upper shell body 1, and the outlets are respectively connected with a plurality of corresponding gas detection chambers 7 (7 in this embodiment); a plurality of exhaust channels 4 (7 in this embodiment) are correspondingly provided in the lower shell body 2. The inlets of the plurality of exhaust channels 4 are respectively connected with a plurality of corresponding gas detection chambers 7, and the outlets are connected with the exhaust port 6 at the center of the lower shell body 2; the plurality of gas detection chambers 7 are respectively provided with sensors 8 for detecting different gas components.

[0025] from Figure 2 It can be seen that, preferably, the plurality of air inlet channels 3 are evenly arranged radially along the air inlet 5 at the center of the upper shell; Figure 3 It can be seen that the exhaust channels 4 are evenly arranged radially along the exhaust port 6 at the center of the lower shell.

[0026] See also Figure 1 The air inlet 5 of the housing is connected to the tail gas inlet pipe 9 via a vacuum pump 11. The tail gas inlet pipe 9 is provided with an air inlet 14 and a three-way valve 10.

[0027] The controller 13 (which may be a single chip microcomputer) is connected to the display 12 for displaying the detection data. The input end of the controller is respectively connected to a plurality of sensors 8 for detecting different gas components. The information collected by the sensors 8 is sent to the controller 13 for calculation and conversion, and the detection results are displayed on the display 12. The output end of the controller is respectively connected to the vacuum pump 11 and the three-way valve 10 for transmitting the start and stop control signal to the vacuum pump 11, and transmitting the control signal for connecting different paths to the three-way valve 10. The exhaust gas intake pipe 9 is used to connect the exhaust gas outlet of the engine.

[0028] The following takes the requirement of simultaneously detecting 7 components in tail gas, CO (ppm), HC (ppm), CH4 (ppm), NO2 (ppm), SO2 (ppm), NO (ppm), CO2 (%VOL = 10000ppm) as an example to illustrate the working principle of the utility model:

[0029] When it is necessary to detect the exhaust gas, the controller 13 controls to open the vacuum pump 11 and the three-way valve 10 at the same time, and connects the passage from the vacuum pump 11 to the exhaust gas intake pipe 9. Under the negative pressure of the vacuum pump 11, the exhaust gas to be detected is drawn out from the exhaust gas intake pipe 9 and sent to the air inlet 5, and then evenly dispersed through the 7 intake channels 3 and enter the 7 gas detection chambers 7 respectively, and is detected by the corresponding sensors 8. The detected exhaust gas is discharged in a centralized manner after being collected into the exhaust port 6 through the corresponding 7 exhaust channels 4;

[0030] When the detection is completed, the controller 13 controls the three-way valve 10 to switch, connects the passage from the vacuum pump 11 to the air inlet 14, closes the exhaust gas inlet pipe 9, and under the negative pressure of the vacuum pump 11, the air is sent into the air inlet 5 from the air inlet 14, and then into the air inlet channel 3, the gas detection chamber 7 and the exhaust channel 4, and finally discharged from the exhaust port 6. The residual exhaust gas in the pipeline and the gas detection chamber is removed by injecting air, which will not affect the accuracy of the next detection.

[0031] Furthermore, the sensor 8 can be turned on and off by the controller 13. When not detecting, the sensor 8 can be turned off to extend the service life. According to the number of engines on the hull, multiple exhaust gas intake pipes 9 can be connected accordingly, and multiple vacuum pumps 11 and three-way valves 10 can be used in parallel. By controlling the three-way valves 10 of different exhaust gas intake pipes 9 by the controller 13, the detection of exhaust gas from different engines can be switched, which is very flexible and convenient.

[0032] The housing is composed of an upper housing 1 and a lower housing 2, which can be easily disassembled and repaired as needed to prevent pipeline blockage and to perform maintenance or repair on the sensor 8 in a timely manner.

Claims

1. A marine exhaust multi-component detection device, comprising a housing, characterized in that: The shell is composed of an upper shell and a lower shell that are correspondingly sealed and connected. The upper shell is provided with multiple air inlet channels, the inlets of the multiple air inlet channels are connected to the air inlet port at the center of the upper shell, and the outlets are respectively connected to the corresponding multiple gas detection chambers; the lower shell is correspondingly provided with multiple exhaust channels, the inlets of the multiple exhaust channels are respectively connected to the corresponding multiple gas detection chambers, and the outlets are connected to the exhaust port at the center of the lower shell; the multiple gas detection chambers are respectively provided with sensors for detecting different gas components.

2. The marine exhaust multi-component detection device as claimed in claim 1, characterized in that: The plurality of air inlet passages are uniformly arranged along the radial direction of the air inlet opening at the center of the upper shell; and the plurality of air exhaust passages are uniformly arranged along the radial direction of the air exhaust opening at the center of the lower shell.

3. The marine exhaust multi-component detection device according to claim 1, characterized in that: The air inlet is connected to the tail gas inlet pipe via a vacuum pump.

4. The marine exhaust multi-component detection device according to claim 3, characterized in that: The tail gas intake pipe is provided with an air intake port and a three-way valve.

5. The marine exhaust multi-component detection device according to any one of claims 1 to 4, characterized in that: The device also includes a controller connected to the display, and the input end of the controller is respectively connected to a plurality of sensors for detecting different gas components.

6. The marine exhaust multi-component detection device according to claim 5, characterized in that: The output end of the controller is connected to a vacuum pump.

7. The marine exhaust multi-component detection device according to claim 6, characterized in that: The output end of the controller is connected to a three-way valve.

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