OCEC analysis device

Abstract

The utility model relates to environmental analysis, and particularly provides an OCEC analysis device which comprises an analysis channel, a sampling channel and an oxidation channel, the sampling channel and the oxidation channel are respectively communicated with the analysis channel, and measuring light emitted by a light source enters the analysis channel; the infrared temperature measurement module is arranged on the analysis channel and is used for obtaining the temperature of the filter membrane in the analysis channel; and the distance between the sampling channel and the position of the filter membrane is more than 2 cm. The device has the advantages of accurate analysis result and the like.

Description

Technical Field

[0001] This utility model relates to environmental monitoring, and in particular to an OCEC analysis device. Background Technology

[0002] When the OCEC online analyzer is used for analysis, the analysis furnace needs to be heated by externally wound heating wires to achieve multiple rapid temperature increases in a short period of time. The purpose is to heat the filter membrane and decompose the carbonaceous components in the particulate matter sampled by the filter membrane according to the temperature rise program. The organic carbon (OC) and elemental carbon (EC) precipitated by the filter membrane at different temperatures can indicate the source of pollution.

[0003] Currently, analyzers on the market use contact thermocouples for temperature measurement, extending the thermocouple into the analysis furnace through a sampling branch, and assuming the temperature of the analysis furnace space is the filter membrane temperature. In contrast, quartz furnaces are designed with the sampling branch close to the filter membrane installation location, allowing the thermocouple to extend into the analysis furnace through the sampling branch, making the thermocouple-measured temperature closer to the filter membrane temperature. The main drawback of this approach is:

[0004] 1. Poor accuracy of test results.

[0005] Currently, the thermocouples in the OCEC analysis furnace measure the temperature of the furnace space, which differs significantly from the actual temperature of the filter membrane. When the thermocouple-measured temperature is higher than the actual filter membrane temperature, the actual filter membrane temperature may not reach the set temperature, causing OC and EC to fail to precipitate according to the set temperature gradient, and some OCEC may not be pyrolyzed.

[0006] 2. Poor operational reliability.

[0007] Currently, the OCEC online analyzer inserts a thermocouple into the analyzer through a sampling branch. To ensure the measured temperature is close to the filter membrane temperature, the sampling branch is designed to be near the filter membrane mounting location. However, interference from the sampling branch causes uneven and non-uniform heating wire wrapping around the filter membrane mounting area during furnace operation. This results in poor heating performance, causing the heating wire temperature to be significantly higher than the internal temperature during heating, leading to uneven heating, easy burnout of the heating wire, and poor heat dissipation. Summary of the Invention

[0008] To address the shortcomings of the existing technical solutions, this utility model provides an OCEC analysis device.

[0009] The objective of this utility model is achieved through the following technical solution:

[0010] An OCEC analysis device includes an analysis channel, a sampling channel, and an oxidation channel, wherein the sampling channel and the oxidation channel are respectively connected to the analysis channel, and measurement light emitted from a light source is incident on the analysis channel; the OCEC analysis device further includes:

[0011] An infrared temperature measurement module is installed on the analysis channel to obtain the temperature of the filter membrane inside the analysis channel.

[0012] The distance between the sampling channel and the filter membrane exceeds 2 cm.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0014] 1. The test results are accurate;

[0015] The temperature of the filter membrane is obtained by using an infrared temperature measurement module, rather than the temperature inside the analysis channel, so that OCEC can be precipitated according to the set temperature gradient, thereby improving the accuracy of the detection results.

[0016] 2. High operational reliability;

[0017] Since the infrared temperature measurement module is used, there is no need for thermocouples, which allows the sampling branch to be located away from the filter membrane. This allows the heating wire to be wrapped evenly and tightly around the outside of the second pipe, resulting in uniform heating and the heating wire being less likely to burn out, thus significantly improving the reliability of operation. Attached Figure Description

[0018] The disclosure of this utility model will become more readily understood with reference to the accompanying drawings. It will be readily understood by those skilled in the art that these drawings are merely illustrative of the technical solutions of this utility model and are not intended to limit the scope of protection of this utility model. In the drawings:

[0019] Figure 1 This is a simplified structural diagram of the OCEC analysis device according to Embodiments 1-2 of this utility model;

[0020] Figure 2 This is a simplified structural diagram of the OCEC analysis device according to Embodiment 3 of this utility model;

[0021] Figure 3 This is a simplified structural diagram of the OCEC analysis device according to Embodiment 4 of this utility model. Detailed Implementation

[0022] Figures 1-3 The following description illustrates optional embodiments of the present invention to teach those skilled in the art how to implement and reproduce it. For the purpose of teaching the technical solutions of the present invention, some conventional aspects have been simplified or omitted. Those skilled in the art should understand that variations or substitutions derived from these embodiments will be within the scope of the present invention. Those skilled in the art should understand that the following features can be combined in various ways to form multiple variations of the present invention. Therefore, the present invention is not limited to the following optional embodiments, but is defined only by the claims and their equivalents.

[0023] Example 1.

[0024] The OCEC analysis device of Embodiment 1 of this utility model, such as Figure 1 As shown, the OCEC analysis device includes:

[0025] Sampling channel 12 and oxidation channel 13 are respectively connected to the analysis channel, and the measurement light emitted by light source 31 enters the analysis channel;

[0026] An infrared temperature measurement module 41 is installed on the analysis channel to obtain the temperature of the filter membrane 61 inside the analysis channel.

[0027] The distance between the sampling channel 12 and the filter membrane 61 is more than 2cm, so that the sampling channel 12 does not affect the installation of the heating wire 51.

[0028] Example 2.

[0029] Application example of the OCEC analysis device according to Embodiment 1 of this utility model.

[0030] In this application example, such as Figure 1 As shown, the analysis channel is formed within the first conduit 21 and the second conduit 22. The second conduit 22 includes a larger inner diameter portion and a smaller inner diameter portion, and the first conduit 21 extends into the larger inner diameter portion and is blocked by the smaller inner diameter portion.

[0031] A membrane holder is provided inside the second pipe 22. The diameter of the membrane holder is larger than that of the first pipe 21. The filter membrane 61 is sandwiched between the end of the first pipe 21 and the membrane holder. The sampling channel 12 and the oxidation channel 13 are connected to the second pipe 22.

[0032] (Outside of filter membrane 61) A spiral heating wire 51 is evenly and tightly wound on the outside of the second pipe 22. An insulation layer is provided on the outside of the heating wire 51. The distance between the sampling channel 12 and the filter membrane 61 is greater than 2cm, so that there is a gap between the outer edge of the heating wire 51 and the sampling channel 12, so as to avoid the sampling channel 12 affecting the uniform and tight installation of the heating wire 51.

[0033] The light source 31 is a semiconductor laser. The light source 31 and the dichroic mirror 33 are fixed at the end of the first pipe 21 away from the filter membrane 61. The measurement light emitted by the light source 31 passes through the dichroic mirror 33 and enters the analysis channel. It is reflected by the filter membrane 61 and the dichroic mirror 33 in sequence, and the reflected light is received by the detector 32.

[0034] The infrared temperature measurement module 41 is located at the end of the second pipe 22 that is away from the first pipe 21.

[0035] Example 3.

[0036] The application example of the OCEC analysis device according to Embodiment 1 of this utility model differs from Embodiment 2 in that:

[0037] like Figure 2 As shown, there is no need to set up a dichroic mirror 33. The detector 32 is set at the end of the first pipe 21 away from the filter membrane 61, and the light source 31 is set at the end of the second pipe 22 away from the first pipe 21. The measuring light emitted by the light source 31 passes through the filter membrane 61 and is received by the detector 32.

[0038] Example 4.

[0039] The application example of the OCEC analysis device according to Embodiment 1 of this utility model differs from Embodiment 3 in that:

[0040] like Figure 3 As shown, the infrared temperature measurement module 41 is located on one side of the second pipe 22, and the infrared radiation emitted by the filter membrane 61 can be received by the infrared temperature measurement module 41.

Claims

1. An OCEC analysis apparatus, comprising an analysis channel, a sampling channel, and an oxidation channel, wherein the sampling channel and the oxidation channel are respectively connected to the analysis channel, and measurement light emitted from a light source is incident on the analysis channel; characterized in that, The OCEC analysis device also includes: An infrared temperature measurement module is installed on the analysis channel to obtain the temperature of the filter membrane inside the analysis channel. The distance between the sampling channel and the filter membrane exceeds 2 cm.

2. The OCEC analysis apparatus according to claim 1, characterized in that, The analysis channel is formed within a first pipe and a second pipe. The second pipe includes a larger inner diameter portion and a smaller inner diameter portion. The first pipe extends into the larger inner diameter portion and is blocked by the smaller inner diameter portion. The filter membrane is sandwiched between the end of the first pipe and the smaller inner diameter portion. The sampling channel and oxidation channel are connected to the second pipe.

3. The OCEC analysis apparatus according to claim 2, characterized in that, A spiral heating wire is wound around the outside of the second conduit, and there is a gap between the edge of the heating wire and the sampling channel on the outside of the second conduit.

4. The OCEC analysis apparatus according to claim 2, characterized in that, The light source is fixed at the end of the first pipe away from the filter membrane, and the infrared temperature measurement module is located at the end of the second pipe away from the first pipe.

5. The OCEC analysis apparatus according to claim 2, characterized in that, The OCEC analysis device also includes: The measurement light passes through the dichroic mirror and enters the analysis channel, where it is reflected sequentially by the filter and the dichroic mirror, and the reflected light is received by the detector.

6. The OCEC analysis apparatus according to claim 5, characterized in that, The OCEC analysis device also includes: The detector is located at the end of the second pipe away from the first pipe. The measuring light passes through the dichroic mirror, enters the analysis channel, and is received by the detector.

7. The OCEC analysis apparatus according to claim 5, characterized in that, The light source is a semiconductor laser.

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