A pre-detection device of a total organic carbon detector

Abstract

A kind of pre-detection device of total organic carbon detector belongs to environmental detection technical field.It is characterized in that: sample delivery pipe (2) and total organic carbon detector (1) and pre-detection device (5) are all provided with stop valve;Pre-detection pipe (51) is communicated with sample delivery pipe (2), acid liquid feeding mechanism (7) is communicated with the top of pre-detection pipe (51), stirring device is arranged in pre-detection pipe (51), non-dispersed infrared method flue gas analyzer (54) is communicated with the upper portion of pre-detection pipe (51), and water removal device (6) is arranged between non-dispersed infrared method flue gas analyzer (54) and pre-detection pipe (51).The present application effectively avoids the low precision and invalid detection of TOC caused by IC greater than TOC, improves the economy of total organic carbon detector detection, and at the same time, when processing sample, can fully mix sample liquid and carry out efficient treatment such as water removal, greatly improve the precision and detection speed of IC detection.

Description

Technical Field

[0001] A pre-detection device for a total organic carbon detector belongs to the field of environmental monitoring technology. Background Technology

[0002] Total organic carbon (TOC) refers to the total amount of carbon contained in dissolved and suspended organic matter in water. There are many types of organic matter in water, including elements such as hydrogen, nitrogen, and sulfur in addition to carbon, and not all of them can be separated and identified. It is often represented by "TOC". TOC is a comprehensive indicator for rapid detection. It expresses the total amount of organic matter in water by the amount of carbon. Since TOC is determined by combustion, it can oxidize all organic matter and is usually used as an important basis for evaluating the degree of organic pollution in water bodies.

[0003] However, in current organic carbon detection, combustion oxidation-nondispersive infrared absorption method is generally used to detect total organic carbon (TOC). When the inorganic carbon IC content in the sample is less than the total organic carbon (TOC) content, the analyzer can directly measure the TOC content. However, when the inorganic carbon IC content in the sample is greater than the total organic carbon (TOC) content, it will not only reduce the accuracy of TOC detection, but may even result in a TOC detection result of 0. In this case, it is necessary to use the more expensive non-purgeable organic carbon (NPOC) detection method for re-detection. Repeated detection is not only troublesome to operate, but also results in invalid detection and wastes detection costs. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a pre-detection device for a total organic carbon detector that can ensure detection accuracy and speed without repeated detection and is easy to operate.

[0005] The technical solution adopted by the present invention to solve its technical problem is: the pre-detection device of the total organic carbon detector, characterized in that: it includes a total organic carbon detector, a pre-detection device and a sample delivery pipe that is connected to both the total organic carbon detector and the pre-detection device, and a shut-off valve is provided between the sample delivery pipe and both the total organic carbon detector and the pre-detection device. The pre-detection device includes a pre-detection tube, a stirring device, an acid feeding mechanism, a dehydration device, and a non-dispersive infrared flue gas analyzer. The pre-detection tube is connected to the sample delivery tube, the acid feeding mechanism is connected to the top of the pre-detection tube, the stirring device is installed inside the pre-detection tube, the non-dispersive infrared flue gas analyzer is connected to the upper part of the pre-detection tube, and the dehydration device is installed between the non-dispersive infrared flue gas analyzer and the pre-detection tube.

[0006] Preferably, the dehydration device includes a spiral blade, a guide blade, and a drive motor arranged sequentially along the gas flow direction. The output shaft of the drive motor is connected to both the spiral blade and the guide blade, and is also connected to a stirring device. The drive motor drives the spiral blade and the guide blade to rotate, thereby capturing and removing droplets from the gas to ensure more accurate detection.

[0007] Preferably, two helical blades are arranged side by side, each helical blade having a convex center that forms a cavity between the two helical blades. The convex center of each helical blade, forming a cavity between the two helical blades, causes a change in airflow velocity as it passes through the cavity, allowing the two helical blades to fully contact the airflow and capture droplets in the airflow.

[0008] Preferably, the guide vanes are provided with a number of elongated holes arranged side by side and spaced apart, and a number of water removal blades are formed on the guide vanes at intervals.

[0009] Preferably, the acid feeding mechanism includes a storage pipe and a first centrifugal valve and a second centrifugal valve disposed within the storage pipe. The second centrifugal valve is spaced above the first centrifugal valve, forming an acid chamber between the first and second centrifugal valves. The outlet of the first centrifugal valve is connected to a pre-detection tube. Both the first and second centrifugal valves are connected to a stirring device. The first centrifugal valve opens as the stirring device rotates, and the second centrifugal valve closes as the stirring device rotates. When the stirring device stops working, the first centrifugal valve closes and the second centrifugal valve opens, allowing liquid to enter and fill the acid chamber. When the stirring device rotates, the second centrifugal valve closes and the first centrifugal valve opens, allowing the acid in the acid chamber to enter the pre-detection tube, thus achieving quantitative addition of acid.

[0010] Preferably, the first centrifugal valve includes a first centrifugal valve disc, a first centrifugal valve flap, and a compression spring. The first centrifugal valve disc is sealed to the liquid storage tube. The first centrifugal valve disc is provided with a liquid outlet hole. The first centrifugal valve flap is slidably mounted on the first centrifugal valve disc. The compression spring is connected to the first centrifugal valve flap and pushes it to close the liquid outlet hole.

[0011] Preferably, the first centrifugal valve disc is provided with a radial first guide groove, the first centrifugal valve flap is slidably installed in the first guide groove, and the compression spring is provided on the outside of the first centrifugal valve flap.

[0012] Preferably, the second centrifugal valve includes a second centrifugal valve disc, a second centrifugal valve flap, and a tension spring. The second centrifugal valve disc is sealed to the liquid storage tube. A liquid replenishment hole is provided on the second centrifugal valve disc. The second centrifugal valve flap is slidably mounted on the second centrifugal valve disc. The second centrifugal valve flap closes the liquid replenishment hole as the second centrifugal valve disc rotates. The tension spring is connected to the second centrifugal valve flap and causes the second centrifugal valve flap to open the liquid replenishment hole.

[0013] Preferably, the stirring device includes an auger and a drive motor, the drive motor being connected to the auger, and the auger having spiral grooves arranged along the auger.

[0014] Preferably, it also includes a heating device connected to the pre-detection tube.

[0015] Compared with the prior art, the beneficial effects of this invention are: The pre-detection device of this total organic carbon analyzer can quickly determine the amount of TOC and IC in the sample. By comparing the TOC and IC contents, the detection method can be selected, effectively avoiding the low accuracy and invalid detection of TOC caused by IC being greater than TOC, thus avoiding waste of detection costs and improving the economic efficiency of the total organic carbon analyzer. At the same time, when processing the sample, it can perform efficient treatments such as thorough mixing and dehydration of the sample liquid, which greatly improves the accuracy and speed of IC detection. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the pre-detection device for a total organic carbon analyzer.

[0017] Figure 2 This is a schematic diagram of the pre-detection tube structure of the pre-detection device for a total organic carbon analyzer.

[0018] Figure 3 This is a schematic diagram of the water removal device structure of the pre-detection unit of the total organic carbon analyzer.

[0019] Figure 4 This is a schematic diagram of the spiral blade structure of the pre-detection device for a total organic carbon analyzer.

[0020] Figure 5 This is a schematic diagram of the guide vane structure of the pre-detection device for a total organic carbon analyzer.

[0021] Figure 6 This is a schematic diagram of the acid feeding mechanism of the pre-detection device for a total organic carbon analyzer.

[0022] Figure 7 This is a schematic diagram of the internal structure of the first transmission link of the pre-detection device for a total organic carbon analyzer.

[0023] In the diagram: 1. Total Organic Carbon (TOC) detector; 2. Sample delivery pipe; 3. TOC detection delivery valve; 4. NPOC detection delivery valve; 5. Pre-detection device; 6. Dehydration device; 7. Acid feeding mechanism; 51. Pre-detection pipe; 52. Heating coil; 53. Sealing cap; 54. Non-dispersive infrared flue gas analyzer; 55. Connecting pipe; 56. First transmission linkage; 57. Screwdriver; 58. First transmission bevel gear; 59. Guide pipe; 61. Drive motor 62. Second transmission connecting rod; 63. Guide vane; 64. Spiral vane; 65. Water removal vane; 66. Second transmission bevel gear; 71. Liquid storage pipe; 72. First centrifugal valve disc; 73. First guide groove; 74. Liquid outlet; 75. First centrifugal valve flap; 76. Compression spring; 77. Second centrifugal valve disc; 78. Second guide groove; 79. Tension spring; 510. Pre-detection feed valve; 710. Second centrifugal valve flap; 711. Liquid replenishment hole. Detailed Implementation

[0024] The present invention will be further described below with reference to specific embodiments. However, those skilled in the art should understand that the detailed description given here with reference to the accompanying drawings is for better explanation. The structure of the present invention necessarily exceeds the limited embodiments described herein. Some equivalent alternatives or common means will not be described in detail here, but still fall within the protection scope of this application.

[0025] Figures 1-7 This is the preferred embodiment of the present invention, which is described below in conjunction with the accompanying drawings. Figures 1-7 The present invention will be further described below.

[0026] A pre-detection device for a total organic carbon (TOC) detector includes a TOC detector 1, a pre-detection device 5, and a sample delivery pipe 2 connected to both the TOC detector 1 and the pre-detection device 5. A shut-off valve is provided between the sample delivery pipe 2 and both the TOC detector 1 and the pre-detection device 5. The pre-detection device 5 includes a pre-detection tube 51, a stirring device, an acid feeding mechanism 7, a dehydration device 6, and a non-dispersive infrared (NDIR) flue gas analyzer 54. The pre-detection tube 51 is connected to the sample delivery pipe 2, the acid feeding mechanism 7 is connected to the top of the pre-detection tube 51, the stirring device is located inside the pre-detection tube 51, the NIR flue gas analyzer 54 is connected to the upper part of the pre-detection tube 51, and the dehydration device 6 is located between the NIR flue gas analyzer 54 and the pre-detection tube 51. The pre-detection device 5 of this total organic carbon analyzer can quickly determine the amount of TOC and IC in the sample. By comparing the TOC and IC contents, the detection method can be selected, which effectively avoids the low accuracy and invalid detection of TOC caused by IC being greater than TOC, avoids waste of detection costs, and improves the economic efficiency of the total organic carbon analyzer. At the same time, when processing the sample, it can perform efficient treatments such as thorough mixing and dehydration of the sample liquid, which greatly improves the accuracy and speed of IC detection.

[0027] Specifically: such as Figure 1 As shown: A pre-detection device 5 is fixedly installed on the side of the total organic carbon (TOC) detector 1. A TOC detection feed valve 3 and an NPOC detection feed valve 4 are located on the side of the TOC detector 1 close to the pre-detection device 5. Both the TOC detection feed valve 3 and the NPOC detection feed valve 4 are shut-off valves. A pre-detection tube 51 is fixedly installed at the bottom inner side of the pre-detection device 5. A heating coil 52 is fixedly installed on the outer wall of the pre-detection tube 51. A non-dispersive infrared (NDIR) flue gas analyzer 54 is fixedly installed inside the pre-detection device 5. A connecting pipe 55 is fixedly installed between 54 and the pre-detection pipe 51. A sealing cap 53 is fixedly installed on the top of the pre-detection pipe 51. A water storage device 6 is provided in the middle section of the connecting pipe 55. A pre-detection feeding valve 510 is provided on the top of the pre-detection machine 5. A set of pipes is diverted from the sample feeding pipe 2 and passes through the pre-detection feeding valve 510 and the sealing cap 53 to connect with the inner cavity of the pre-detection pipe 51. The end of the sample feeding pipe 2 is also diverted through a set of tee connectors to two sets of pipes that are respectively connected to the TOC detection feeding valve 3 and the NPOC detection feeding valve 4.

[0028] The bottom center of the pre-detection tube 51 is rotatably connected to the first transmission link 56 via a bearing. The top of the first transmission link 56 is fixedly installed with a guide tube 59. The acid feeding mechanism 7 is installed on the top of the guide tube 59. The acid feeding mechanism 7 communicates with the inner cavity of the pre-detection tube 51 through the guide tube 59. The outer side wall of the first transmission link 56 is also fixedly installed with an auger 57 and a first transmission bevel gear 58.

[0029] The total organic carbon analyzer 1 is existing technology. The TOC detection feed valve 3 and the NPOC detection feed valve 4 are connected to the internal measuring instruments of the total organic carbon analyzer 1, and can measure the total organic carbon (TOC) and non-purgeable organic carbon (NPOC) in the sample respectively. At the same time, the heating coil 52 can heat and maintain the sample liquid inside the pre-detection tube 51 at 150°C to keep the inorganic carbonates in the sample liquid in a state of efficient decomposition, improve detection efficiency, and reduce detection time.

[0030] It should be noted that acidification of the sample solution can decompose the inorganic carbonates in the sample solution into carbon dioxide. After absorption and detection by the non-dispersive infrared flue gas analyzer 54, the content of inorganic carbon IC in the sample can be obtained. At the same time, it is compared with the total organic carbon (TOC) content obtained by the TOC detection feed valve 3 entering the total organic carbon analyzer 1, so as to select the subsequent detection method for the sample. This effectively avoids the low accuracy and invalid detection of TOC caused by IC being greater than TOC.

[0031] like Figure 2As shown: The stirring device includes an auger 57, and multiple sets of spiral grooves are opened along the surface of the auger 57. The side of the auger 57 is in contact with the inner wall of the pre-detection tube 51, and the bottom of the auger 57 is in contact with the bottom of the pre-detection tube 51.

[0032] The spiral grooves on the surface of the auger 57 can increase the disturbance of the sample liquid inside the pre-detection tube 51 by the auger 57, improve the stirring efficiency. At the same time, by the auger 57 being in contact with the bottom and inner wall of the pre-detection tube 51, the inner wall and bottom of the pre-detection tube 51 can be scraped and cleaned when the auger 57 rotates, preventing the heating coil 52 from causing impurities inside the sample liquid to precipitate on the inner wall of the pre-detection tube 51.

[0033] like Figure 3 As shown: The dewatering device 6 includes a drive motor 61 and spiral blades 64 and guide blades 63 arranged sequentially along the airflow direction inside the connecting pipe 55. The drive motor 61 is fixedly installed inside the connecting pipe 55 via multiple sets of fixed shafts and a set of sealing boxes. One end of the fixed shaft is fixedly connected to the inner wall of the connecting pipe 55, and the other end is fixedly connected to the sealing box. Several fixed shafts are arranged at intervals around the sealing box. In this embodiment, three fixed shafts are evenly distributed around the sealing box, thereby realizing the installation and fixation of the sealing box. The drive motor is located inside the sealing box. A second transmission connecting rod 62 is fixedly installed on the output shaft of the drive motor 61. One end of the second transmission connecting rod 62 extends into the sealing box and is connected to the output shaft of the drive motor 62. The other end extends into the pre-detection pipe 51 and is equipped with a second transmission bevel gear 66, which meshes with a first transmission bevel gear 58. The axes of the output shaft of the drive motor 61 and the second transmission connecting rod 62 are both coincident with the axis of the connecting pipe 55. Several guide blades 63 are evenly distributed around the second transmission connecting rod 62.

[0034] like Figure 4 As shown: There are two symmetrical sets of spiral blades 64, and the middle part of the spiral blades 64 protrudes outward, forming a cavity between the two sets of spiral blades 64.

[0035] The spiral blade 64 is provided with a spiral-shaped elongated hole that penetrates the spiral blade 64, and several spiral-shaped elongated holes are evenly distributed around the spiral blade 64. The spiral-shaped elongated holes and the protrusions can effectively increase the contact area between the spiral blade 64 and water vapor in the air, improve the capture efficiency and speed of water vapor by the spiral blade 64, and improve the water removal effect.

[0036] like Figure 5As shown: The guide vane 63 is provided with several rectangular elongated holes, which are arranged radially along the second transmission connecting rod 62, and several water removal blades 65 are formed on the guide vane 63 in parallel and spaced apart. When the guide vane 63 rotates, the water removal blades 65 can increase the contact area with water vapor, thereby improving the capture and condensation effect of water vapor in the air.

[0037] like Figure 6 As shown: The acid feeding mechanism 7 includes a storage pipe 71, a first centrifugal valve, and a second centrifugal valve. The storage pipe 71 is fixedly installed on the top of the guide pipe 59, and the top of the storage pipe 71 is rotatably connected to the sealing cap 53 through a set of sealed bearings. The first centrifugal valve and the second centrifugal valve are both located inside the storage pipe 71 and rotate synchronously with the storage pipe 71. The second centrifugal valve is spaced above the first centrifugal valve and forms an acid chamber between the first centrifugal valve and the second centrifugal valve.

[0038] The first centrifugal valve includes a first centrifugal valve disc 72, a first centrifugal valve flap 75, and a compression spring 76. The first centrifugal valve disc 72 is coaxial with and fixedly connected to the top of the guide pipe 59, and rotates synchronously with the guide pipe 59. The first centrifugal valve disc 72 is sealed to the liquid storage pipe 71 and drives the liquid storage pipe 71 to rotate synchronously. Several radial first guide grooves 73 are provided on the upper surface of the first centrifugal valve disc 72. In this embodiment, four first guide grooves 73 are evenly distributed around the first centrifugal valve disc 72. An outlet hole 74 is provided at the inner end of each first guide groove 73, which connects the acid chamber to the guide pipe 59. A first centrifugal valve flap 75 and a compression spring 76 are slidably installed in each first guide groove 73. The compression spring 76 is located on the outside of the corresponding first centrifugal valve flap 75. One end of the compression spring 76 is connected to the first centrifugal valve disc 72, and the other end is connected to the first centrifugal valve flap 75, pushing the first centrifugal valve flap 75 inward and closing the corresponding outlet hole 74. When the guide tube 59 drives the first centrifugal valve disc 72 to rotate, the first centrifugal valve flap 75 moves outward under the action of centrifugal force and opens the corresponding liquid outlet 74, so that the acid in the acid chamber enters the pre-detection tube 51.

[0039] The second centrifugal valve includes a second centrifugal valve disc 77, a second centrifugal valve flap 710, and a tension spring 79. The second centrifugal valve disc 77 is spaced above the first centrifugal valve disc 72. The second centrifugal valve disc 77 is sealed and fixedly connected to the inner wall of the liquid storage tube 71. The second centrifugal valve disc 77 rotates synchronously with the liquid storage tube 71. The acid chamber is located between the second centrifugal valve disc 77 and the first centrifugal valve disc 72. A plurality of radial second guide grooves 78 are provided on the upper end surface of the second centrifugal valve disc 77. In this embodiment, four second guide grooves 78 are evenly distributed around the second centrifugal valve disc 77. A replenishment hole 711 is provided at the outer end of each second guide groove 78, which connects the acid chamber to the upper part of the liquid storage tube 71. Each second guide groove 78 has a slidably mounted second centrifugal valve disc 710 and a tension spring 79. The tension spring 79 is located inside the corresponding second centrifugal valve disc 710. One end of the tension spring 79 is connected to the second centrifugal valve disc 77, and the other end is connected to the second centrifugal valve disc 710, causing the second centrifugal valve disc 710 to move inward and open the corresponding replenishment hole 711. The sealing cover 53 has a chamber for storing acid, and the chamber in the sealing cover 53 is connected to the upper part of the storage tube 71. The acid in the upper part of the storage tube 71 flows into the acid chamber between the first centrifugal valve disc 72 and the second centrifugal valve disc 77 through the replenishment hole 711. When the guide tube 59 drives the first centrifugal valve disc 72 to rotate, the second centrifugal valve disc 710 moves outward under the action of centrifugal force and closes the corresponding replenishment hole 711, preventing the acid from re-entering the acid chamber and realizing the quantitative addition of acid. To ensure that all the acid in the acid chamber can flow into the pre-detection tube 51. A buffer gas pipe can be installed at the top of the acid chamber to ensure that the gas pressure inside the acid chamber is constant, thereby ensuring that the acid can flow smoothly into or out of the acid chamber.

[0040] The sealing cap 53 is filled with an acidic solution such as hydrochloric acid or phosphoric acid; the acid chamber between the first centrifugal valve disc 72 and the second centrifugal valve disc 77 matches the acid volume required by the pre-detection tube 51 to acidify the sample solution, which can realize the quantitative supply of acid to the inside of the pre-detection tube 51.

[0041] When the device is not in operation, the acid chamber between the first centrifugal valve disc 72 and the second centrifugal valve disc 77 can be filled through the replenishment hole 711. When in operation, the replenishment hole 711 can be blocked by rotating the storage tube 71, and at the same time, acid is filled into the pre-detection tube 51 through the outlet hole 74 to acidify the sample solution. This realizes the quantitative replenishment of acid during pre-detection and automatic replenishment of acid after the operation is completed, without the need for manual addition of acid. At the same time, it avoids the difference in the amount of acid added during the acidification process, ensuring stable and efficient acidification of the pre-detection liquid while avoiding waste of acid.

[0042] like Figure 7As shown: The top opening of the guide tube 59 is connected to the bottom of the outlet hole 74, and the connection between the guide tube 59 and the storage tube 71 is sealed. The bottom of the guide tube 59 is coaxially connected to the first transmission connecting rod 56 and rotates synchronously. An acid channel is provided inside the first transmission connecting rod 56. The inlet of the acid channel is connected to the bottom opening of the guide tube 59, and the outlet of the acid channel is located on the side of the first transmission connecting rod 56, and the outlet is located below the first transmission bevel gear 58. During operation, this can prevent the acid from directly contacting the first transmission bevel gear 58 and causing corrosion.

[0043] The non-dispersive infrared flue gas analyzer 54 and the total organic carbon detector 1 are electrically connected. The total organic carbon detector 1 and the TOC detection feed valve 3, the pre-detection feed valve 510 and the NPOC detection feed valve 4 are also electrically connected.

[0044] The non-dispersive infrared flue gas analyzer 54 can detect the inorganic carbon (IC) content in a sample. By comparing it with the total organic carbon (TOC) in the pre-detection, it can select an appropriate detection method for the subsequent overall sample detection, effectively avoiding low accuracy and invalid detection of TOC caused by IC being greater than TOC, and avoiding waste of detection costs.

[0045] It should be noted that TOC detection is currently a commonly used method for total organic carbon detection. Compared with NPOC detection, it is lower in cost and faster. By pre-detecting the sample, the detection method for subsequent samples can be automatically selected, ensuring the accuracy of total organic carbon detection while maintaining the economy of detection. By pre-processing the sample and automatically selecting the detection method based on the processing results, not only is the accuracy of total organic carbon content detection effectively guaranteed, but invalid monitoring is also effectively avoided, greatly improving the working efficiency of the total organic carbon detector and avoiding wasted costs.

[0046] The operation method of the pre-detection device of this total organic carbon (TOC) analyzer is as follows: Before the device is started, the TOC detection feed valve 3, the NPOC detection feed valve 4, and the pre-detection feed valve 510 are all in a closed state. First, the TOC analyzer 1 controls the opening of the pre-detection feed valve 510 and the TOC detection feed valve 3. The detection liquid inside the sample delivery tube 2 enters the TOC analyzer 1 and the pre-detection tube 51 quantitatively through the TOC detection feed valve 3 and the pre-detection feed valve 510, respectively. Then, the pre-detection feed valve 510 is closed, and the heating coil 52 is energized to heat the liquid inside the pre-detection tube 51. Then, the drive motor is controlled... When 61 is powered on, it drives the second transmission link 62 to rotate, which in turn drives the first transmission bevel gear 58 to rotate via the second transmission bevel gear 66. This, in turn, drives the first transmission link 56 to rotate, which in turn drives the pre-guided tube 59 to rotate, causing the storage tube 71 to rotate. Under the action of centrifugal force, the first centrifugal valve disc 75 moves towards the inner wall of the storage tube 71, compressing the compression spring 76 and exposing the outlet hole 74. The acid inside the storage tube 71 enters the guide tube 59 through the outlet hole 74, then enters the acid channel of the first transmission link 56 and flows into the pre-detection tube 51 to mix with the detection liquid. The rotation of the first transmission link 56 drives the auger 57 to rotate, stirring the detection liquid and acid, greatly improving the acidification speed and efficiency of the detection liquid, shortening the detection time, and increasing the detection speed. It can decompose inorganic carbonates in the detection liquid into carbon dioxide. At the same time, the rotation of the second transmission link 62 drives the guide vane 63 to rotate, guiding the water vapor and carbon dioxide generated inside the pre-detection tube 51 towards the non-dispersive infrared detector 54. When the water vapor and carbon dioxide pass through the spiral vane 64, the spiral vane 64 rotates under the drive of the second transmission link 62, which can capture water vapor in the mixed gas. In addition to the condensation effect, when the guide vane 63 rotates to guide the flow, the dewatering vane 65 can increase the contact area between the guide vane 63 and water vapor, achieving a good water vapor capture effect. The water condensed on the surface of the spiral vane 64 and the dewatering vane 65 is collected with the rotation of the spiral vane 64 and the guide vane 63 and thrown to the inner wall of the connecting pipe 55 under the action of centrifugal force, and then flows back to the interior of the pre-detection tube 51 under the action of gravity. This can effectively reduce water vapor in the air and improve the detection accuracy of carbon dioxide. At the same time, the sample entering the total organic carbon detector 1 is subjected to TOC detection to measure the total organic carbon (TOC) in the sample.

[0047] It should be noted that when the device is not in operation, the liquid storage tube 710 exposes the replenishment hole 711 under the elastic force of the tension spring 79, and the first centrifugal valve disc 75 blocks the outlet hole 74 under the elastic force of the compression spring 76. At this time, the acid inside the liquid storage tube 71 fills the space between the first centrifugal valve disc 72 and the second centrifugal valve disc 77 through the replenishment hole 711. When the device is rotating, the liquid storage tube 710 drives the tension spring 79 to stretch under the action of centrifugal force, blocking the replenishment hole 711 through the liquid storage tube 710. The first flow channel 73 is compressed under the action of centrifugal force, exposing the first flow channel 73. The outlet 74 fills the pre-detection tube 51 with acid, enabling automatic quantitative replenishment of acid to the space between the first centrifugal valve disc 72 and the second centrifugal valve disc 77 when the device is not in operation. When the device starts rotating, the centrifugal force can automatically stop the replenishment of acid and simultaneously fill the pre-detection tube 51 with acid. This achieves quantitative replenishment of acid during pre-detection and automatic replenishment of acid after the operation is completed, eliminating the need for manual acid addition. It also avoids differences in the amount of acid added during the acidification process, ensuring stable and efficient acidification of the pre-detection liquid while avoiding acid waste.

[0048] After the carbon dioxide undergoes dehydration treatment, it enters the non-dispersive infrared detector 54 to obtain the inorganic carbon content IC in the sample. When the detected TOC content is greater than the IC, the TOC detection feed valve 3 is opened to directly detect the total organic carbon content (TOC) in the sample. When the IC content in the sample is greater than the TOC content, the NPOC detection feed valve 4 is opened to detect the non-purgeable organic carbon in the sample.

[0049] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A pre-detection device for a total organic carbon detector, characterized in that: It includes a total organic carbon detector (1), a pre-detection device (5), and a sample delivery pipe (2) that is connected to both the total organic carbon detector (1) and the pre-detection device (5). A shut-off valve is provided between the sample delivery pipe (2) and both the total organic carbon detector (1) and the pre-detection device (5). The pre-detection device (5) includes a pre-detection tube (51), a stirring device, an acid feeding mechanism (7), a dehydration device (6), and a non-dispersive infrared flue gas analyzer (54). The pre-detection tube (51) is connected to the sample delivery tube (2), the acid feeding mechanism (7) is connected to the top of the pre-detection tube (51), the stirring device is installed inside the pre-detection tube (51), the non-dispersive infrared flue gas analyzer (54) is connected to the upper part of the pre-detection tube (51), and the dehydration device (6) is installed between the non-dispersive infrared flue gas analyzer (54) and the pre-detection tube (51). The acid feeding mechanism (7) includes a storage pipe (71) and a first centrifugal valve and a second centrifugal valve disposed in the storage pipe (71). The second centrifugal valve is disposed at intervals above the first centrifugal valve and forms an acid chamber between the first centrifugal valve and the second centrifugal valve. The outlet of the first centrifugal valve is connected to the pre-detection pipe (51). Both the first centrifugal valve and the second centrifugal valve are connected to the stirring device. The first centrifugal valve is turned on as the stirring device rotates, and the second centrifugal valve is turned off as the stirring device rotates.

2. The pre-detection device of the total organic carbon detector according to claim 1, characterized in that: The dewatering device (6) includes a spiral blade (64), a guide blade (63) and a drive motor (61) arranged sequentially along the gas flow direction. The output shaft of the drive motor (61) is connected to both the spiral blade (64) and the guide blade (63). The output shaft of the drive motor (61) is also connected to the stirring device.

3. The pre-detection device of the total organic carbon detector according to claim 2, characterized in that: The spiral blades (64) are arranged in two rows, with the middle of each spiral blade (64) protruding outward and forming a cavity between the two spiral blades (64).

4. The pre-detection device of the total organic carbon detector according to claim 2, characterized in that: The guide vane (63) is provided with a number of elongated holes arranged side by side and spaced apart, and a number of water removal blades (65) are formed on the guide vane (63) at intervals.

5. The pre-detection device of the total organic carbon detector according to claim 1, characterized in that: The first centrifugal valve includes a first centrifugal valve disc (72), a first centrifugal valve flap (75), and a compression spring (76). The first centrifugal valve disc (72) is sealed to the liquid storage tube (71). The first centrifugal valve disc (72) is provided with a liquid outlet hole (74). The first centrifugal valve flap (75) is slidably mounted on the first centrifugal valve disc (72). The compression spring (76) is connected to the first centrifugal valve flap (75) and pushes it to close the liquid outlet hole (74).

6. The pre-detection device of the total organic carbon detector according to claim 5, characterized in that: The first centrifugal valve disc (72) is provided with a radial first guide groove (73), the first centrifugal valve flap (75) is slidably installed in the first guide groove (73), and the compression spring (76) is provided on the outside of the first centrifugal valve flap (75).

7. The pre-detection device of the total organic carbon detector according to claim 1, characterized in that: The second centrifugal valve includes a second centrifugal valve disc (77), a second centrifugal valve flap (710), and a tension spring (79). The second centrifugal valve disc (77) is sealed to the liquid storage tube (71). A replenishment hole (711) is provided on the second centrifugal valve disc (77). The second centrifugal valve flap (710) is slidably mounted on the second centrifugal valve disc (77). The second centrifugal valve flap (710) closes the replenishment hole (711) as the second centrifugal valve disc (77) rotates. The tension spring (79) is connected to the second centrifugal valve flap (710) and causes the second centrifugal valve flap (710) to open the replenishment hole (711).

8. The pre-detection device of the total organic carbon detector according to claim 1, characterized in that: The stirring device includes an auger (57) and a drive motor (61). The drive motor (61) is connected to the auger (57), and the auger (57) is provided with a spiral groove along the auger (57).

9. The pre-detection device of the total organic carbon detector according to claim 1, characterized in that: It also includes a heating device connected to the pre-detection tube (51).

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