Online desulfurization wastewater intelligent analyzer

Abstract

The utility model discloses an on-line intelligent analyzer for desulfurization waste water. The online desulfurization wastewater intelligent analyzer comprises: an ion chromatograph; the device comprises a detection module and a dilution module, the detection module comprises a first peristaltic pump, a second peristaltic pump, a third peristaltic pump, a quantitative loop, a six-way valve, a first conductivity detector and a mixer, and the dilution module comprises a first reversing valve, a second reversing valve, a sample temporary storage container, an injection pump, a mixing pool, a standard sample storage tank and a second pure water storage tank. A liquid outlet of the sample temporary storage container, a liquid inlet / outlet of the injection pump and a liquid outlet of the second pure water storage tank are respectively connected with the first reversing valve, a liquid inlet / outlet of the mixing pool and a liquid inlet of the ion chromatograph are connected with the second reversing valve, and a liquid outlet of the third peristaltic pump is connected with a liquid inlet of the sample temporary storage container. The dilution ratio is automatically adjusted according to the concentration, so that the detection accuracy is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of intelligent measuring instruments and analyzers, in particular to an on-line intelligent analyzer for desulfurized waste water. Background Art

[0002] Thermal power plants need to measure the contents of various cations and anions in desulfurized waste water to ensure the efficiency of the desulfurization process and avoid equipment corrosion in a high-salt environment, providing necessary guarantees for the efficient desulfurization of thermal power plants and the normal operation of equipment. At present, for the detection of desulfurized waste water in thermal power plants, the traditional chemical method is mainly used, which has low efficiency and a very cumbersome process. When using ion chromatography for detection, the pretreatment of samples also needs to be manually completed by experimental personnel. The sample pretreatment also reaches the analysis requirements through manual filtration and multiple manual dilutions. Since the ion content in the sample cannot be known in advance, the specific dilution multiple of the sample can only be judged by the experimental personnel themselves. If the dilution multiple is inappropriate, it needs to be rediluted, resulting in heavy manual detection work, greatly extended analysis time and poor reproducibility. In view of this, how to design a technology for automatic liquid injection detection to improve the detection efficiency is the technical problem to be solved by the utility model. Summary of the Utility Model

[0003] The utility model provides an on-line intelligent analyzer for desulfurized waste water, which can automatically adjust the dilution multiple according to the sample concentration and fully mix the sample and the diluent to improve the detection accuracy of the on-line intelligent analyzer for desulfurized waste water.

[0004] To achieve the above object, the utility model adopts the following technical solutions:

[0005] The utility model provides an on-line intelligent analyzer for desulfurized waste water, comprising:

[0006] An ion chromatograph, which is provided with a sampling valve;

[0007] A detection module, which includes a first peristaltic pump, a second peristaltic pump, a quantitative loop, a six-way valve and a first conductivity detector. The quantitative loop, the liquid outlet of the first peristaltic pump, the liquid outlet of the second peristaltic pump and the liquid inlet of the first conductivity detector are respectively connected to the six-way valve. The liquid inlet of the first peristaltic pump is connected to a sample storage tank, and the liquid inlet of the second peristaltic pump is connected to a first pure water storage tank;

[0008] Dilution module, which includes a first switching valve, a second switching valve, a sample temporary storage container, an injection pump, a mixing tank, and a second pure water storage tank. The liquid outlet of the sample temporary storage container, the liquid inlet and outlet of the injection pump, and the liquid outlet of the second pure water storage tank are respectively connected to the first switching valve. The liquid inlet and outlet of the mixing tank and the sampling valve are respectively connected to the second switching valve. The first switching valve and the second switching valve are connected. The liquid inlet of the sample temporary storage container is also connected to the six-way valve.

[0009] Further, the six-way valve is used to switch the quantitative loop to be respectively communicated with the first peristaltic pump and the first conductivity detector;

[0010] The six-way valve is also used to switch the quantitative loop to be respectively communicated with the second peristaltic pump and the sample temporary storage container.

[0011] Further, the first switching valve is used to switch the injection pump to selectively communicate with the sample temporary storage container, the second pure water storage tank, or the second switching valve.

[0012] Further, the second switching valve is used to switch the first switching valve to selectively communicate with the mixing tank and the ion chromatograph.

[0013] Further, the liquid outlet of the first conductivity detector is also connected with a pH detector.

[0014] Further, two such dilution modules are included;

[0015] The on-line intelligent analyzer for desulfurized waste water further includes a third switching valve. The liquid inlets of the sample temporary storage containers of the two dilution modules and the six-way valve are respectively connected to the third switching valve.

[0016] Further, the third switching valve is used to switch the six-way valve to be communicated with the liquid inlet of the sample temporary storage container of one of the dilution modules.

[0017] Further, a Na-type pretreatment column is also provided and connected between the liquid inlet of the sample temporary storage container of one of the dilution modules and the third switching valve.

[0018] The technical solution of the present utility model has the following technical effects compared with the prior art: The first conductivity detector is used to detect whether the concentration of the sample needs to be diluted, and the second peristaltic pump is used for pre-dilution. Since the volumes of the mixer and the quantitative loop are fixed, a certain amount of pure water is transported to the mixer by the second peristaltic pump, so that the sample in the quantitative loop is transported to the sample storage container together with the pure water. According to the information of the detected concentration of the sample, dilution by a set multiple can be carried out through the dilution module, realizing automatic adjustment of the dilution multiple according to the sample concentration and full mixing of the sample and the diluent, so as to improve the detection accuracy of the on-line desulfurized waste water intelligent analyzer. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic structural diagram of an embodiment of the on-line desulfurized waste water intelligent analyzer of the present utility model;

[0020] Figure 2 It is a schematic structural diagram of the detection module in an embodiment of the on-line desulfurized waste water intelligent analyzer of the present utility model;

[0021] Figure 3 It is one of the schematic assembly structural diagrams of the dilution module and the ion chromatograph in an embodiment of the on-line desulfurized waste water intelligent analyzer of the present utility model;

[0022] Figure 4 It is the schematic assembly structure principle of the dilution module and the ion chromatograph in an embodiment of the on-line desulfurized waste water intelligent analyzer of the present utility model Figure 2 .

[0023] Reference numerals:

[0024] 100, detection module;

[0025] 110, first peristaltic pump; 120, second peristaltic pump; 130, third peristaltic pump; 140, quantitative loop; 150, six-way valve; 160, first conductivity detector; 170, mixer; 180, PH detector;

[0026] 111, sample storage tank; 121, first pure water storage tank; 131, second conductivity detector;

[0027] 200, dilution module;

[0028] 210, first reversing valve; 220, second reversing valve; 230, sample storage container; 240, injection pump; 250, mixing tank; 260, standard sample storage tank; 270, second pure water storage tank; 280, third reversing valve; 290, fourth reversing valve;

[0029] 300, ion chromatograph;

[0030] 310, Sampling valve; 320, First quantifier; 330, Second quantifier; 340, Isocratic pump; 350, Eluent container. Detailed implementation mode

[0031] As Figures 1 - 3 shown, the present utility model provides an on-line desulfurized waste water intelligent analyzer, comprising: a detection module 100, a dilution module 200 and an ion chromatograph 300.

[0032] The detection module 100 includes a first peristaltic pump 110, a second peristaltic pump 120, a sampling loop 140, a six-way valve 150 and a first conductivity detector 160. The sampling loop 140, the liquid outlet of the first peristaltic pump 110, the liquid outlet of the second peristaltic pump 120, the liquid inlet of the first conductivity detector 160 and the liquid inlet of the mixer 170 are respectively connected to the six-way valve 150. The liquid inlet of the first peristaltic pump 110 is connected to a sample storage tank 111, and the liquid inlet of the second peristaltic pump 120 is connected to a first pure water storage tank 121;

[0033] The dilution module 200 includes a first reversing valve 210, a second reversing valve 220, a sample temporary storage container 230, an injection pump 240, a mixing tank 250, a standard sample storage tank 260 and a second pure water storage tank 270. The liquid outlet of the sample temporary storage container 230, the liquid inlet and outlet of the injection pump 240, and the liquid outlet of the second pure water storage tank 270 are respectively connected to the first reversing valve 210. The liquid inlet and outlet of the mixing tank 250 and the liquid inlet of the ion chromatograph 300 are connected to the second reversing valve 220. The first reversing valve 210 is connected to the second reversing valve 220, and the liquid outlet of the six-way valve 150 is connected to the liquid inlet of the sample temporary storage container 230.

[0034] Specifically, in the actual detection process, it is not known in advance whether the concentration of the sample solution in the sample storage tank 111 meets the detection range requirements of the ion chromatograph 300. For this reason, for the sample in the sample storage tank 111, the sample is first transported to the sampling loop 140 through the first peristaltic pump 110 for quantitative sampling, and the excessive sample will flow through the first conductivity detector 160, and the first conductivity detector 160 is used to detect the concentration of the sample (the specific detection method can refer to the record of Chinese Patent Publication No. CN 108267356 A, which will not be limited and elaborated here).

[0035] According to the detected concentration, the dilution multiple required for the sample can be known. Then, the six-way valve 150 is switched so that the second peristaltic pump 120 sucks the pure water in the first pure water storage tank 121 and transports it to the sampling loop 140 to transport the sample in the positioning loop to the sample temporary storage container 230.

[0036] For the dilution module 200, it can perform a dilution process on the sample temporary storage container 230 according to the dilution multiple required for the concentration of the sample detected by the detection module 100.

[0037] Specifically, when the concentration of the sample detected by the detection module 100 exceeds the detection range, it is diluted by the dilution module 200. When the first switching valve 210 switches the injection pump 240 to be connected to the second pure water storage tank 270, a certain amount of pure water is inhaled from the second pure water storage tank 270 through the injection pump 240; then, the first switching valve 210 switches the injection pump 240 to be connected to the sample temporary storage container 230, and a certain amount of liquid is inhaled from the sample temporary storage container 230 through the injection pump 240 to meet the requirements of the dilution multiple.

[0038] Preferably, the detection module 100 further includes a third peristaltic pump 130 and a mixer 170. The sampling loop 140, the liquid outlet of the first peristaltic pump 110, the liquid outlet of the second peristaltic pump 120, the liquid inlet of the first conductivity detector 160, and the liquid inlet of the mixer 170 are respectively connected to the six-way valve 150. The liquid outlet of the mixer 170 is connected to the liquid inlet of the third peristaltic pump 130, and the liquid outlet of the third peristaltic pump 130 is connected to the liquid inlet of the sample temporary storage container 230.

[0039] Specifically, the second peristaltic pump 120 sucks the pure water in the first pure water storage tank 121 and transports it to the sampling loop 140 to transport the sample in the positioning loop to the mixer 170 for pre-dilution. Since the volume in the mixer 170 is certain, the multiple of the pre-diluted sample is also certain.

[0040] The pure water and the sample are mixed in the mixer 170 to form a pre-mixed solution, and the pre-mixed solution is transported to the sample temporary storage container 230 of the dilution module 200 through the third peristaltic pump 130.

[0041] For the pre-mixed solution transported by the detection module 100, if it does not reach the detection range requirements of the ion chromatograph 300 after pre-dilution, it will be finally diluted by the dilution module 200. When the first switching valve 210 switches the injection pump 240 to be connected to the second pure water storage tank 270, a certain amount of pure water is inhaled from the second pure water storage tank 270 through the injection pump 240; then, the first switching valve 210 switches the injection pump 240 to be connected to the sample temporary storage container 230, and a certain amount of pre-mixed solution is inhaled from the sample temporary storage container 230 through the injection pump 240, and the ratio of the pre-mixed solution to the pure water can exactly meet the requirements of the final dilution multiple of the sample.

[0042] The first switching valve 210 switches the connection between the injection pump 240 and the second switching valve 220. The second switching valve 220 switches to connect with the mixing tank 250. The injection pump 240 will reciprocate to enable the premixed liquid and pure water to be fully and evenly mixed to form a sample detection liquid. After the sample detection liquid is evenly mixed, the second switching valve 220 switches to connect with the ion chromatograph 300 to input the sample detection liquid into the ion chromatograph 300 for detection.

[0043] Among them, for the six-way valve 150, it has two states during the working process, that is, the six-way valve 150 is used to switch the connection between the quantitative loop 140 and the first peristaltic pump 110 and the first conductivity detector 160 respectively; the six-way valve 150 is also used to switch the connection between the quantitative loop 140 and the second peristaltic pump 120 and the mixer 170 respectively.

[0044] In addition, for the first switching valve 210, the first switching valve 210 is used to switch the injection pump 240 to selectively connect to the sample temporary storage container 230, the second pure water storage tank 270, the standard sample storage tank 260, or the second switching valve 220. Similarly, the second switching valve 220 is used to switch the first switching valve 210 to selectively connect to the mixing tank 250 and the ion chromatograph 300.

[0045] In addition, during the actual use process, in order to calculate the content of the unknown sample, standard substances are usually used for calculation. By measuring a series of standard solutions of a certain substance, the peak areas of each solution can be obtained. Taking the concentration as the abscissa and the peak area as the ordinate, a standard curve can be obtained. Therefore, when detecting an unknown concentration sample, the process of obtaining the standard curve through the standard sample storage tank 260 can refer to the specific operation process of conventional ion chromatography analysis, which will not be elaborated and restricted here.

[0046] Preferably, the outlet of the first conductivity detector 160 is also connected to a PH detector 180.

[0047] Furthermore, a second conductivity detector 131 is also provided between the inlet of the third peristaltic pump 130 and the outlet of the mixer 170.

[0048] Specifically, the second conductivity detector 131 can further detect the concentration of the premixed liquid again, so as to confirm whether the pre-dilution of the detection module 100 reaches the set pre-dilution multiple. At the same time, the dilution module 200 will finally determine the final dilution multiple based on the concentration of the premixed liquid detected by the second conductivity detector 131. In this way, the problem of inaccurate pre-dilution caused by too low amount of pure water transported by the second peristaltic pump 120 resulting in the pre-dilution not reaching the set pre-dilution multiple can be avoided, which is more conducive to precise dilution of the sample.

[0049] Further, it further includes two of the dilution modules 200; the on-line desulfurized waste water intelligent analyzer further includes a third switching valve 280; the liquid inlets of the sample temporary storage containers 230 of the two dilution modules 200 and the liquid outlet of the third peristaltic pump 130 are respectively connected to the third switching valve 280.

[0050] Specifically, in order to reduce the equipment investment cost, when it is necessary to simultaneously meet the detection requirements of cations and anions, two dilution modules 200 are configured. One dilution module 200 is used for diluting cation samples, and the other dilution module 200 is used for diluting anion samples. A Na-type pretreatment column 201 is further provided at the inlet of the sample temporary storage container 230 of the dilution module 200 for diluting anion samples. Each dilution module 200 is connected to a corresponding ion chromatograph 300.

[0051] Wherein, the third switching valve is used to switch the liquid outlet of the third peristaltic pump 130 to communicate with the liquid inlet of the sample temporary storage container 230 of one of the dilution modules 200.

[0052] Based on the above embodiments, optionally, as Figure 4 shown, since the second peristaltic pump 120 configured in the detection module 100 definitely needs to pre-dilute the sample during use, and for samples with concentrations within the detection range, after pre-dilution, there will be a situation where the concentration of the pre-diluted low-concentration sample is too low to be detected; similarly, for samples with too low concentrations, after re-pre-dilution, there will also be a situation where the concentration further decreases and the ion chromatograph 300 cannot detect it. Therefore, the following structural improvements are made to the ion chromatograph 300 and the dilution module 200.

[0053] The dilution module 200 further includes a fourth reversing valve 290, and the fourth reversing valve 290 is connected between the second reversing valve 220 and the ion chromatograph 300. The fourth reversing valve 290 has an inlet and two outlets.

[0054] The ion chromatograph 300 is further provided with a sampling valve 310, a first quantifier 320, a second quantifier 330 and a metering pump 340. The sampling valve 310 has at least ten valve ports. The first quantifier 320, the second quantifier 330 and the metering pump 340 are connected to the corresponding valve ports of the sampling valve 310. The liquid inlet of the metering pump 340 is connected to an eluent container 350; the volume of the first quantifier 320 is smaller than the volume of the second quantifier 330; the two outlets of the fourth reversing valve 290 are respectively connected to the corresponding valve ports of the sampling valve 310.

[0055] The injection valve 310 is used to switch one outlet of the fourth switching valve 290 to connect to the first quantitative device 320, and the injection valve 310 is also used to switch the other outlet of the fourth switching valve 290 to connect to the second quantitative device 330.

[0056] Specifically, for the pre-mixture that has been detected by the detection module 100 and pre-diluted and is transported to the dilution module 200, if the concentration meets the detection range of the ion chromatograph 300, it can be directly transported to the injection valve 310 through one outlet of the fourth switching valve 290 without additional dilution and enter the first quantitative device 320; similarly, for the sample detection solution diluted by the dilution module 200 to a reasonable detection range, it can also be directly transported to the injection valve 310 through one outlet of the fourth switching valve 290 and enter the first quantitative device 320. The injection valve 310 switches to connect the flat pump 340 and the first quantitative device 320, and uses the eluent to transport the sample detection solution in the first quantitative device 320 to the ion chromatograph 300 for analysis. Among them, the first quantitative device 320 can also use a quantitative loop for quantitative sampling.

[0057] For the case where the concentration of the sample is low, after being pre-diluted by the detection module 100, if the concentration of the pre-mixture is already lower than the minimum detection concentration value of the ion chromatograph 300, the dilution module 200 transports the pre-mixture as the sample detection solution to the injection valve 310 through the other outlet of the fourth switching valve 290 and enters the second quantitative device 330.

[0058] Specifically, for the situation where the concentration of the sample is too low and also exceeds the sample concentration detection range, and since the concentration of the sample is too low to be concentrated, in order to meet the detection requirements of the sample with too low concentration, a second quantitative device 330 with a larger capacity (such as a longer concentration column, etc.) can be configured on the injection valve 310.

[0059] In this way, when the concentration of the sample is lower than the detection range of the set concentration, the injection valve 310 switches the second quantitative device 330 to participate in the work to obtain a sufficient amount of the sample through the second quantitative device 330. And because the total amount of the sample is large, when a large amount of the sample is transported from the injection valve 310 to the ion chromatographic analysis under the action of the flat pump 340, although the concentration of the sample is low, the sufficient amount of the sample enables the total amount of the substance to be detected to meet the detection requirements, and thus can meet the detection requirements of the sample with too low concentration, more effectively broadening the applicable range of the intelligent chromatograph and having a higher degree of intelligence.

[0060] The technical solution of the present utility model has the following technical effects compared with the prior art: The first conductivity detector is used to detect whether the concentration of the sample needs to be diluted, and the second peristaltic pump is used for pre-dilution. Since the volumes of the mixer and the quantitative loop are fixed, the second peristaltic pump conveys a certain amount of pure water to the mixer, so that the pure water conveys the sample in the quantitative loop to the mixer for quantitative pre-dilution together; the third peristaltic pump can convey the pre-mixed liquid to the sample storage container of the dilution module. According to the information of the detected concentration of the sample, the dilution module can be used to perform dilution by a set multiple, realizing automatic adjustment of the dilution multiple according to the sample concentration and ensuring full mixing of the sample and the diluent, so as to improve the detection accuracy of the on-line desulfurized waste water intelligent analyzer.

[0061] The above is only the specific implementation manner of the present utility model, but the protection scope of the present utility model is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present utility model should be covered by the protection scope of the present utility model. Therefore, the protection scope of the present utility model shall be subject to the protection scope of the claims.

Claims

1. An online desulfurization wastewater intelligent analyzer, characterized in that: include: An ion chromatograph, wherein the ion chromatograph is provided with an injection valve; A detection module, comprising a first peristaltic pump, a second peristaltic pump, a quantitative loop, a six-way valve and a first conductivity detector, wherein the quantitative loop, the liquid outlet of the first peristaltic pump, the liquid outlet of the second peristaltic pump and the liquid inlet of the first conductivity detector are respectively connected to the six-way valve, the liquid inlet of the first peristaltic pump is connected to a sample storage tank, and the liquid inlet of the second peristaltic pump is connected to a first pure water storage tank; The dilution module includes a first reversing valve, a second reversing valve, a sample temporary storage container, a syringe pump, a mixing pool and a second pure water storage tank. The liquid outlet of the sample temporary storage container, the liquid inlet and outlet of the syringe pump, and the liquid outlet of the second pure water storage tank are respectively connected to the first reversing valve, the liquid inlet and outlet of the mixing pool and the injection valve are respectively connected to the second reversing valve, the first reversing valve and the second reversing valve are connected, and the liquid inlet of the sample temporary storage container is also connected to the six-way valve.

2. The online desulfurization wastewater intelligent analyzer according to claim 1 is characterized in that: The six-way valve is used to switch the quantitative ring to be connected to the first peristaltic pump and the first conductivity detector respectively; The six-way valve is also used to switch the quantitative ring to be connected to the second peristaltic pump and the sample temporary storage container respectively.

3. The online desulfurization wastewater intelligent analyzer according to claim 1 is characterized in that: The first reversing valve is used to switch the injection pump to selectively connect to the sample temporary storage container, the second pure water storage tank, or the second reversing valve.

4. The online desulfurization wastewater intelligent analyzer according to claim 3 is characterized in that: The second reversing valve is used to switch the first reversing valve to selectively connect the mixing tank and the injection valve.

5. The online desulfurization wastewater intelligent analyzer according to claim 1 is characterized in that: The liquid outlet of the first conductivity detector is also connected to a pH detector.

6. The online desulfurization wastewater intelligent analyzer according to any one of claims 1 to 5, characterized in that: Also includes two of the dilution modules; The online desulfurization wastewater intelligent analyzer also includes a third switching valve, and the liquid inlets of the sample temporary storage containers of the two dilution modules and the six-way valve are respectively connected to the third switching valve.

7. The online desulfurization wastewater intelligent analyzer according to claim 6 is characterized in that: The third switching valve is used to switch the six-way valve to communicate with a liquid inlet of the sample temporary storage container of the dilution module.

8. The online desulfurization wastewater intelligent analyzer according to claim 6 is characterized in that: A Na-type pretreatment column is also provided between the liquid inlet of the sample temporary storage container of one of the dilution modules and the third switching valve for communication.

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