TOC analyzer using ozone catalysis

Abstract

The utility model discloses a TOC (Total Organic Carbon) analyzer utilizing ozone catalysis. The TOC analyzer comprises an air stripping pipe, a liquid inlet unit, a liquid inlet pump, an air pump, an ozone supply unit and a detector, the liquid inlet pump is used for communicating a liquid outlet of the liquid inlet unit with a liquid inlet in the bottom of the air stripping pipe; one end of the air pump is connected with an air pipe, and the other end of the air pump is communicated with the stripping pipe; a gas outlet of the ozone supply unit is communicated with the stripping pipe; the detector is used for monitoring the concentration of carbon dioxide in real time, and an air inlet of the detector is communicated with an air outlet in the top of the air stripping pipe. The ozone supply unit is arranged in the analyzer, sufficient ozone can be provided to fully oxidize a sample, organic carbon is oxidized and decomposed into carbon dioxide, and under the action of the ozone supply unit, when the analyzer is used for measuring TOC, the oxidation efficiency is high, the measured result is accurate, and the test effect is good.

Description

Technical Field

[0001] The utility model relates to the technical field of water quality analysis, in particular to a TOC analyzer utilizing ozone catalysis. Background Art

[0002] Total organic carbon (TOC) is an important indicator for assessing the degree of organic contamination in water, expressed as the mass concentration of carbon (C). Currently, TOC measurement relies on converting the organic carbon in a sample into carbon dioxide using various oxidation methods. The TOC content is then calculated using the corresponding relationship between the carbon content of carbon dioxide and TOC.

[0003] Measurement methods can be categorized as direct or indirect. Direct methods generally produce more accurate results, but because they rely on combustion oxidation, they are less convenient for online monitoring. Therefore, indirect methods, i.e., wet oxidation, are often used for online water quality monitoring.

[0004] When using the indirect method to determine TOC, a variety of oxidants can be used, including hydrogen peroxide, potassium peroxide, potassium permanganate, potassium dichromate, persulfate, etc. However, in actual testing, it was found that the oxidation efficiency was still relatively low, which was not conducive to the accurate determination of TOC content. Utility Model Content

[0005] The purpose of the utility model is to provide a TOC analyzer using ozone catalysis to achieve accurate determination of TOC content.

[0006] In order to achieve the above purpose, the technical solution adopted by the present utility model is as follows:

[0007] A TOC analyzer using ozone catalysis includes a stripping pipe, a liquid inlet unit, a liquid inlet pump, an air pump, an ozone supply unit and a detector; the liquid inlet pump connects the liquid outlet of the liquid inlet unit with the liquid inlet at the bottom of the stripping pipe; one end of the air pump is connected to an air pipe, and the other end is connected to the stripping pipe; the air outlet of the ozone supply unit is connected to the stripping pipe; the detector is used to monitor the carbon dioxide concentration in real time, and the air inlet of the detector is connected to the air outlet at the top of the stripping pipe.

[0008] Furthermore, the liquid inlet unit includes three-way valves Q1-Q7, which are arranged in stages, and between any two adjacent three-way valves, the common end of the upper-level three-way valve and the normally open end of the lower-level three-way valve are connected to each other; the normally open end of the three-way valve Q1 at the first stage is connected to a cleaning pipe, and the control end is connected to an air pipe; the common end of the three-way valve Q7 at the last stage is connected to the liquid inlet pump.

[0009] Furthermore, the liquid inlet unit also includes a pure water pipe, a sample tube, a standard liquid pipe, a waste liquid pipe and two reagent tubes. The pure water pipe, sample tube, standard liquid pipe, waste liquid pipe, reagent pipe and the three-way valve are arranged one by one and are respectively connected to the control end of the three-way valve Q2-Q7.

[0010] Furthermore, a three-way valve Q8 is provided between the ozone supply unit and the stripping pipe. The normally open end of the three-way valve Q8 is blocked, the control end is connected to the air inlet at the top of the stripping pipe, and the common end is connected to the air outlet of the ozone supply unit.

[0011] Furthermore, it also includes a three-way valve Q9, the liquid inlet at the bottom of the blow-off pipe is connected to the common end of the three-way valve Q9, the liquid inlet pump is connected between the liquid inlet unit and the normally open end of the three-way valve Q9, and the air pump is connected to the control end of the three-way valve Q9 and then connected to the blow-off pipe.

[0012] Furthermore, an adjustable flow meter is provided between the air pump and the three-way valve Q9.

[0013] Furthermore, the detector is a non-dispersive infrared carbon dioxide sensor.

[0014] Furthermore, a TOC gas reaction chamber is provided between the detector and the stripping tube, and the TOC gas reaction chamber is filled with copper particles and a desiccant that does not absorb carbon dioxide.

[0015] Furthermore, it also includes an air outlet control unit and an ozone absorber; the air inlet of the air outlet control unit is connected to the air outlet at the top of the blow-off tube, and the air outlet is respectively connected to the air inlet of the ozone absorber and the detector; the ozone absorber is equipped with an ozone catalyst.

[0016] Furthermore, the gas outlet control unit includes three-way valves Q10-Q12; the normally open end of the three-way valve Q10 is connected to a waste liquid pipe, the control end is connected to the ozone absorber, and the common end is connected to the control end of the three-way valve Q11; the normally open end of the three-way valve Q11 is connected to the detector, and the common end is connected to the common end of the three-way valve Q12; the normally open end of the three-way valve Q12 is connected to the gas outlet at the top of the blow-off pipe, and the control end is connected to the liquid discharge port of the blow-off pipe.

[0017] The utility model has the following beneficial effects:

[0018] The utility model provides a TOC analyzer utilizing ozone catalysis. The analyzer is equipped with an ozone supply unit, which can provide sufficient ozone to fully oxidize the sample, so that the organic carbon is oxidized and decomposed into carbon dioxide. Under the action of the ozone supply unit, when the analyzer is used to measure TOC, the oxidation efficiency is high, the measured result is relatively accurate, and the test effect is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic structural diagram of the utility model.

[0020] Explanation of the main component symbols: 1. Blow-off tube; 2. Liquid inlet unit; 3. Liquid inlet pump; 4. Air pump; 5. Ozone supply unit; 6. Detector; 7. Adjustable flow meter; 8. TOC gas reaction chamber; 9. Gas outlet control unit; 10. Ozone absorber; Q1-Q12, three-way valve; Air, air pipe; WS, cleaning pipe; H, pure water pipe; S, sample tube; C, standard solution tube; W, waste liquid tube; R1-R2, reagent tube. DETAILED DESCRIPTION

[0021] The present invention will be further described below with reference to the accompanying drawings and specific implementation methods.

[0022] like Figure 1 As shown, the utility model discloses a TOC analyzer using ozone catalysis, including a stripping tube 1, a liquid inlet unit 2, a liquid inlet pump 3, an air pump 4, an ozone supply unit 5 and a detector 6. The stripping tube 1 is made of glass and is the main reaction site. The top of the stripping tube 1 is covered and provided with a liquid discharge port, an air outlet and an air inlet. The bottom of the stripping tube 1 is provided with a liquid inlet. The liquid inlet pump 3 adopts a peristaltic pump, and the liquid outlet of the liquid inlet unit 2 is connected to the liquid inlet at the bottom of the stripping tube 1, which can provide power for the liquid to enter and exit and flow in the flow path. One end of the air pump 4 is connected to the air pipe Air, and the other end is connected to the stripping tube 1, which can provide stripping gas to strip carbon dioxide. The air outlet of the ozone supply unit 5 is connected to the stripping tube 1 to provide sufficient ozone. The detector 6 is used to monitor the carbon dioxide concentration in real time, and the air inlet of the detector 6 is connected to the air outlet at the top of the stripping tube 1.

[0023] Specifically, the liquid inlet unit 2 includes two three-way valves Q1-Q7, which are arranged in stages, and between any two adjacent three-way valves, the common end of the three-way valve of the upper stage is connected to the normally open end of the three-way valve of the lower stage. For example, the common end of the three-way valve Q1 is connected to the normally open end of the three-way valve Q2, and the common end of the three-way valve Q2 is connected to the normally open end of the three-way valve Q3. The normally open end of the three-way valve Q1 at the first stage is connected to the cleaning pipe WS, and the control end is connected to the air pipe Air. The common port of the three-way valve Q7 at the last stage is the liquid outlet of the liquid inlet unit 2, and the common end of the three-way valve Q7 is connected to the liquid inlet pump 3.

[0024] The liquid inlet unit 2 also includes a pure water pipe H, a sample pipe S, a standard liquid pipe C, a waste liquid pipe W and two reagent pipes (i.e., a reagent pipe R1 and a reagent pipe R2). The pure water pipe H, the sample pipe S, the standard liquid pipe C, the waste liquid pipe W, the reagent pipe and the three-way valve are arranged in a one-to-one correspondence and are respectively connected to the control ends of the three-way valves Q2-Q7. In conjunction with the liquid inlet pump 3, the reagents, samples, standard liquids, cleaning liquids and other liquids can be correspondingly extracted into the stripping pipe 1. In this embodiment, the control end of the three-way valve Q2 is connected to the reagent pipe R1, the control end of the three-way valve Q3 is connected to the reagent pipe R2, the control end of the three-way valve Q4 is connected to the pure water pipe H, the control end of the three-way valve Q5 is connected to the sample pipe S, the control end of the three-way valve Q6 is connected to the standard liquid pipe C, and the control end of the three-way valve Q7 is connected to the waste liquid pipe W.

[0025] A three-way valve Q8 is arranged between the ozone supply unit 5 and the stripping pipe 1. The normally open end of the three-way valve Q8 is sealed by a plug, the control end is connected to the air inlet at the top of the stripping pipe 1, and the common end is connected to the air outlet of the ozone supply unit 5. The ozone produced by the ozone supply unit 5 can be introduced into the stripping pipe 1 to oxidize the sample through the three-way valve Q8 and the corresponding pipeline, and the supply and stop of ozone can be controlled.

[0026] A three-way valve Q9 is installed between the air pump 4 and the stripping tube 1. The liquid inlet at the bottom of the stripping tube 1 is connected to the common end of the three-way valve Q9. The liquid inlet pump 3 is connected between the liquid inlet unit 2 and the normally open end of the three-way valve Q9. The air pump 4 is connected to the control end of the three-way valve Q9 and thus to the stripping tube 1. The three-way valve Q9 coordinates the liquid inlet pump 3 and the air pump 4 to switch and control the liquid inlet and stripping operations. An adjustable flowmeter 7 is installed between the air pump 4 and the three-way valve Q9 to accurately measure and effectively control the stripping airflow.

[0027] Detector 6 utilizes a non-dispersive infrared (NDIR) carbon dioxide sensor, employing non-dispersive infrared (NDIR) technology to efficiently and accurately monitor and measure real-time carbon dioxide concentrations, obtaining peak carbon dioxide concentration data. A TOC gas reaction chamber 8 is located between detector 6 and stripping tube 1. This chamber contains copper particles and a non-carbon dioxide-absorbing desiccant, such as CaCl2. This desiccant absorbs moisture and other impurities from the stripped carbon dioxide, leaving only the carbon dioxide to reach detector 6, resulting in more accurate measurement results.

[0028] The analyzer also includes an outlet control unit 9 and an ozone absorber 10. The ozone absorber 10 contains an ozone catalyst that effectively absorbs ozone. The air inlet of the outlet control unit 9 is connected to the outlet at the top of the stripping tube 1, which in turn connects to the ozone absorber 10 and the air inlet of the detector 6. The outlet control unit 9 controls the gas in the stripping tube 1 to enter the detector 6 for testing or to enter the ozone absorber 10 to absorb excess ozone.

[0029] In this embodiment, the gas outlet control unit 9 includes three-way valves Q10-Q12. The normally-open end of three-way valve Q10 is connected to a waste liquid pipe W, its control end is connected to the ozone absorber 10, and its common end is connected to the control end of three-way valve Q11. The normally-open end of three-way valve Q11 is connected to the detector 6, and its common end is connected to the common end of three-way valve Q12. The normally-open end of three-way valve Q12 is connected to the gas outlet at the top of the blow-off pipe 1, and its control end is connected to the liquid outlet of the blow-off pipe 1.

[0030] The steps for measuring TOC with this analyzer are as follows:

[0031] S1. Extract pure water: Open the control end of the three-way valve Q4 and rotate the liquid inlet pump 3 forward to extract pure water from the pure water pipe H and pump it into the stripping pipe 1.

[0032] S2. Empty the stripping tube 1: Open the three-way valve Q7 and the three-way valve Q11, and reverse the liquid inlet pump 3 to extract the liquid in the stripping tube 1 and empty it through the waste pipe W. After the emptying is completed, close the three-way valve Q7 and the liquid inlet pump 3.

[0033] S3. Sampling: Open the three-way valve Q5 and the three-way valve Q11, and rotate the liquid inlet pump 3 forward to draw the sample from the sample tube S and pump it into the stripping tube 1. After sampling is completed, close the three-way valve Q5 and the liquid inlet pump 3.

[0034] S4. Primary Stripping: Open three-way valves Q3 and Q11, and rotate liquid inlet pump 3 forward. Acid reagent is drawn from reagent tube R2 and pumped into stripping tube 1 to lower the sample pH. After the sample is pumped in, close three-way valve Q3. Then, open three-way valve Q9 and operate air pump 4. Air is pumped into stripping tube 1, purging the inorganic carbon in the sample as CO2. The purged gas passes through TOC gas reaction chamber 8 and directly into detector 6. Detector 6 then detects an inorganic carbon peak in real time. Then, close three-way valve Q9 and air pump 4.

[0035] S5. Digestion: Open three-way valves Q2 and Q11 and rotate liquid inlet pump 3 forward to draw alkaline reagent from reagent tube R1 and pump it into stripping tube 1. Once digestion is complete, close three-way valve Q2. Then, open three-way valves Q8 and Q10 and activate ozone supply unit 5 to introduce ozone for oxidation. Excess ozone is absorbed by ozone absorber 10. Ozone oxidation fully oxidizes the sample, converting organic carbon into CO2.

[0036] S6. Secondary Stripping: Open three-way valves Q3 and Q11, and rotate liquid inlet pump 3 forward. Acid reagent is again drawn from reagent tube R2 and pumped into stripping tube 1 to lower the sample pH. After the acid reagent is pumped in, close three-way valve Q3. Then, open three-way valve Q9 again and operate air pump 4 to purge the oxidized organic carbon in the sample as CO2. Detector 6 then measures the organic carbon peak in real time. Then, close three-way valve Q9 and air pump 4.

[0037] S7. Calculation: The TOC concentration of the sample can be calculated from the inorganic carbon peak, organic carbon peak, and peak values ​​of the standard solution and blank sample obtained by the test.

[0038] In summary, the TOC analyzer has high conversion efficiency, relatively accurate measurement results, good test effect and high stability.

[0039] Although the present invention has been specifically shown and described in conjunction with the preferred embodiments, it should be understood by those skilled in the art that various changes in form and details of the present invention are within the scope of protection of the present invention without departing from the spirit and scope of the present invention as defined in the appended claims.

Claims

1. A TOC analyzer using ozone catalysis, characterized in that: It includes a stripping pipe, a liquid inlet unit, a liquid inlet pump, an air pump, an ozone supply unit and a detector; the liquid inlet pump connects the liquid outlet of the liquid inlet unit with the liquid inlet at the bottom of the stripping pipe; one end of the air pump is connected to an air pipe, and the other end is connected to the stripping pipe; the air outlet of the ozone supply unit is connected to the stripping pipe; the detector is used to monitor the carbon dioxide concentration in real time, and the air inlet of the detector is connected to the air outlet at the top of the stripping pipe.

2. A TOC analyzer utilizing ozone catalysis as claimed in claim 1, characterized in that: The liquid inlet unit includes three-way valves Q1-Q7, which are arranged in stages, and between any two adjacent three-way valves, the common end of the three-way valve of the upper stage is connected to the normally open end of the three-way valve of the lower stage; the normally open end of the three-way valve Q1 at the first stage is connected to a cleaning pipe, and the control end is connected to an air pipe; the common end of the three-way valve Q7 at the last stage is connected to the liquid inlet pump.

3. A TOC analyzer utilizing ozone catalysis as claimed in claim 2, characterized in that: The liquid inlet unit also includes a pure water pipe, a sample pipe, a standard liquid pipe, a waste liquid pipe and two reagent pipes. The pure water pipe, sample pipe, standard liquid pipe, waste liquid pipe, reagent pipe and the three-way valve are arranged one by one and are respectively connected to the control end of the three-way valve Q2-Q7.

4. A TOC analyzer utilizing ozone catalysis as claimed in claim 1, characterized in that: A three-way valve Q8 is provided between the ozone supply unit and the stripping pipe. The normally open end of the three-way valve Q8 is blocked, the control end is connected to the air inlet at the top of the stripping pipe, and the common end is connected to the air outlet of the ozone supply unit.

5. A TOC analyzer utilizing ozone catalysis as claimed in claim 1, characterized in that: It also includes a three-way valve Q9. The liquid inlet at the bottom of the blow-off pipe is connected to the common end of the three-way valve Q9. The liquid inlet pump is connected between the liquid inlet unit and the normally open end of the three-way valve Q9. The air pump is connected to the control end of the three-way valve Q9 and then connected to the blow-off pipe.

6. A TOC analyzer utilizing ozone catalysis as claimed in claim 5, characterized in that: An adjustable flow meter is provided between the air pump and the three-way valve Q9.

7. A TOC analyzer utilizing ozone catalysis as claimed in claim 1, characterized in that: The detector is a non-dispersive infrared carbon dioxide sensor.

8. A TOC analyzer utilizing ozone catalysis as claimed in claim 1, characterized in that: A TOC gas reaction chamber is provided between the detector and the stripping pipe, and the TOC gas reaction chamber is filled with copper particles and a desiccant that does not absorb carbon dioxide.

9. A TOC analyzer utilizing ozone catalysis as claimed in claim 1, characterized in that: It also includes an air outlet control unit and an ozone absorber; the air inlet of the air outlet control unit is connected to the air outlet at the top of the blow-off tube, and the air outlet is respectively connected to the air inlet of the ozone absorber and the detector; the ozone absorber is equipped with an ozone catalyst.

10. A TOC analyzer utilizing ozone catalysis according to claim 9, characterized in that: The gas outlet control unit includes three-way valves Q10-Q12; the normally open end of the three-way valve Q10 is connected to a waste liquid pipe, the control end is connected to the ozone absorber, and the common end is connected to the control end of the three-way valve Q11; the normally open end of the three-way valve Q11 is connected to the detector, and the common end is connected to the common end of the three-way valve Q12; the normally open end of the three-way valve Q12 is connected to the gas outlet at the top of the blow-off pipe, and the control end is connected to the liquid discharge port of the blow-off pipe.

Images