Equipment for rapidly measuring content of silicate

Abstract

The utility model relates to the field of water quality detection and analysis, and provides equipment for rapidly determining the content of silicate radicals, which comprises a four-channel peristaltic pump, a to-be-detected liquid storage device, a first reaction coil pipe, a second reaction coil pipe, a third reaction coil pipe and a spectrophotometer which are sequentially connected through a connecting pipe, four input ends of the four-channel peristaltic pump are respectively connected with a silicon-free water storage device, an ammonium molybdate storage device, an oxalic acid storage device and an ammonium ferrous sulfate storage device, and four output ends of the four-channel peristaltic pump are respectively provided with a silicon-free water output pipe, an ammonium molybdate output pipe, an oxalic acid output pipe and an ammonium ferrous sulfate output pipe. According to the utility model, the measurement result is accurate and reliable, the automation degree of the test process is high, the influence of human factors is reduced, the test speed is higher, the working efficiency is greatly improved, and the technical problems of lower measurement speed and poorer measurement precision when the silicon content in water is measured are solved.

Description

Technical Field

[0001] This utility model relates to the field of water quality testing and analysis, and in particular to a device for rapidly determining silicate content. Background Technology

[0002] The silica content in power plant feedwater and boiler water is one of the main performance indicators for assessing water quality. Measuring silica content allows for understanding the quality of drinking water and boiler water, and determining whether appropriate treatment measures are needed. Power standards stipulate that the silicate content in medium-pressure, high-pressure, and ultra-high-pressure boiler water should be controlled between 0 and 2000 μg / L, and the silicate content in subcritical (or once-through) boiler water should not exceed 250 μg / L; the silicate content in feedwater should be controlled below 20 μg / L. Currently, thermal power plants mainly use the following methods as one of the water quality monitoring standards for silica content determination: molybdenum blue spectrophotometry is used when SiO2 content is 1–5 mg / L; and a laboratory micro-silicate analyzer is used when SiO2 content is 0–100 μg / L. Currently, analysis is usually done manually by laboratory personnel. Even for a skilled analyst, it takes about 15 minutes to analyze one sample, resulting in low efficiency and insufficient accuracy. Utility Model Content

[0003] Therefore, to address the aforementioned problems, this invention proposes a device for rapidly determining silicate content. It solves the technical problems of slow measurement speed and poor measurement accuracy when measuring silicon content in water.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A device for rapidly determining silicate content includes a four-channel peristaltic pump, a test solution storage device, a first reaction coil, a second reaction coil, a third reaction coil, and a spectrophotometer, all connected sequentially via connecting pipes. The spectrophotometer is connected to a data logger. The four input terminals of the four-channel peristaltic pump are respectively connected to a silica-free water storage device, an ammonium molybdate storage device, an oxalic acid storage device, and a ferrous ammonium sulfate storage device. The four output terminals of the four-channel peristaltic pump are respectively provided with silica-free water output pipes, ammonium molybdate output pipes, oxalic acid output pipes, and ferrous ammonium sulfate output pipes. The silica-free water output pipe is connected to the output terminal of the test solution storage device. The ammonium molybdate output pipe is connected to a connecting pipe between the test solution storage device and the first reaction coil. The oxalic acid output pipe is connected to a connecting pipe between the first and second reaction coils. The ferrous ammonium sulfate output pipe is connected to a connecting pipe between the second and third reaction coils.

[0006] Further:

[0007] The ammonium molybdate storage device contains 3%-7% ammonium molybdate solution, the oxalic acid storage device contains 7%-11% oxalic acid solution, and the ferrous ammonium sulfate storage device contains 4%-8% ferrous ammonium sulfate solution.

[0008] The ammonium molybdate storage device contains a 5% ammonium molybdate solution, the oxalic acid storage device contains a 9% oxalic acid solution, and the ferrous ammonium sulfate storage device contains a 6% ferrous ammonium sulfate solution.

[0009] The silicon-free water storage device stores silicon-free water, which is high-purity water with a conductivity of less than 0.06 μS / cm.

[0010] The speed of the four-channel peristaltic pump is controlled at 45 rpm.

[0011] The first reaction coil is 150cm long, the second reaction coil is 80cm long, and the third reaction coil is 50cm long.

[0012] The spectrophotometer has a 1cm optical path flow cell.

[0013] The absorption wavelength of the spectrophotometer is selected as 800 nm.

[0014] By adopting the aforementioned technical solution, the beneficial effects of this utility model are:

[0015] Silicon content is one of the important indicators for evaluating water quality. This invention is mainly used to detect the silicon content in power plant feedwater and boiler water. The measurement results are more accurate and reliable, the testing process is highly automated, reducing the impact of human factors on the test results and lowering the risk of human error. The test results have good repeatability, small error, and faster testing speed, which can shorten the waiting time for results and greatly improve work efficiency. Furthermore, under a certain acidity, silicates react with ammonium molybdate to produce silicomolybdate yellow, which is reduced to silicomolybdate blue with a reducing agent. The depth of this color conforms to the Lambert-Beer theorem with the concentration of silicates in the water. When there is interference from phosphorus, arsenic, etc. in the water, masking agents such as oxalic acid are added. Oxalic acid can also prevent interference from a small amount of iron ions and the reduction of excess ammonium molybdate. Furthermore, the four-channel peristaltic pump runs at a constant speed to reduce the influence of random errors. Furthermore, the optical path flow cell can reduce light loss and reduce measurement errors. The absorption wavelength of 800nm ​​is selected because it has strong absorbance. Above or below 800nm, the light intensity weakens, resulting in a decrease in absorbance. Attached Figure Description

[0016] Figure 1 This is a simplified structural diagram of the present invention.

[0017] In the diagram: 1. Connecting pipe; 2. Four-channel peristaltic pump; 3. Test solution storage device; 4. First reaction coil; 5. Second reaction coil; 6. Third reaction coil; 7. Spectrophotometer; 8. Data logger; 9. Silicon-free water storage device; 10. Ammonium molybdate storage device; 11. Oxalic acid storage device; 12. Ferrous ammonium sulfate storage device; 13. Silicon-free water output pipe; 14. Ammonium molybdate output pipe; 15. Oxalic acid output pipe; 16. Ferrous ammonium sulfate output pipe. Detailed Implementation

[0018] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0019] refer to Figure 1 This utility model provides a device for rapidly determining silicate content, including a four-channel peristaltic pump 2, a test liquid storage device 3, a first reaction coil 4, a second reaction coil 5, a third reaction coil 6, a spectrophotometer 7, and a data logger 8 connected to the spectrophotometer 7, all connected in sequence via a connecting pipe 1.

[0020] The four-channel peristaltic pump 2 has four input terminals connected to a silicon-free water storage device 9, an ammonium molybdate storage device 10, an oxalic acid storage device 11, and a ferrous ammonium sulfate storage device 12, respectively. The four output terminals of the four-channel peristaltic pump 2 are respectively provided with a silicon-free water output pipe 13, an ammonium molybdate output pipe 14, an oxalic acid output pipe 15, and a ferrous ammonium sulfate output pipe 16. The silicon-free water output pipe 13 is connected to the output terminal of the test solution storage device 3. The ammonium molybdate output pipe 14 is connected to the connecting pipe 1 between the test solution storage device 3 and the first reaction coil 4. The oxalic acid output pipe 15 is connected to the connecting pipe 1 between the first reaction coil 4 and the second reaction coil 5. The ferrous ammonium sulfate output pipe 16 is connected to the connecting pipe 1 between the second reaction coil 5 and the third reaction coil 6.

[0021] The ammonium molybdate storage device 10 stores a 5% ammonium molybdate solution, the oxalic acid storage device 11 stores a 9% oxalic acid solution, and the ferrous ammonium sulfate storage device 12 stores a 6% ferrous ammonium sulfate solution. The silica-free water storage device 9 stores silica-free water, which is high-purity water with a conductivity of less than 0.06 μS / cm. The speed of the four-channel peristaltic pump 2 is controlled at 45 rpm. The length of the first reaction coil 4 is 150 cm, the length of the second reaction coil 5 is 80 cm, and the length of the third reaction coil 6 is 50 cm. The spectrophotometer 7 has a 1 cm optical path flow cell, and the absorption wavelength of the spectrophotometer 7 is selected as 800 nm.

[0022] The first reaction coil 4, the second reaction coil 5, and the third reaction coil 6 mentioned above can also be of other lengths, depending on the specific circumstances.

[0023] The aforementioned four-channel peristaltic pump 2, spectrophotometer 7, and data logger 8 are well-known technologies and will not be described in detail here.

[0024] The working principle of this utility model is as follows:

[0025] S1. Use a four-channel peristaltic pump 2 to draw in silica-free water as the carrier of the reaction system. The test liquid storage device 3 outputs 0.8 mL of test liquid. The silica-free water and the test liquid enter the first reaction coil 4 along the connecting tube 1.

[0026] S2. A 5% ammonium molybdate solution is drawn into the first reaction coil 4 using a four-channel peristaltic pump 2 to react. The test solution and the 5% ammonium molybdate solution are mixed and reacted to generate silicomolybdenum yellow.

[0027] S3. To eliminate the interference of phosphate in the sample, a 9% oxalic acid solution was drawn into the second reaction coil 5 using a four-channel peristaltic pump 2. The 9% oxalic acid solution reacted with the interfering substance (phosphomolybdic yellow) to form a colorless complex.

[0028] S4. 6% ferrous ammonium sulfate is drawn in by a four-channel peristaltic pump 2 and reacted in the third reaction coil 6. Then, the silicomolybdenum yellow produced in S2 is mixed with 6% ferrous ammonium sulfate and reacted to produce silicomolybdenum blue.

[0029] S5. Use spectrophotometer 7 to test the absorbance of the silicomolybdenum blue generated in S4;

[0030] S6. Record and analyze the above test data using the data logger 8.

[0031] Although the present invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that various changes in form and detail may be made to the present invention without departing from the spirit and scope of the present invention as defined in the appended claims, and all such changes shall be within the scope of protection of the present invention.

Claims

1. A device for rapidly determining silicate content, characterized in that: The device includes a four-channel peristaltic pump, a test solution storage device, a first reaction coil, a second reaction coil, a third reaction coil, and a spectrophotometer, all connected sequentially via connecting pipes. The spectrophotometer is connected to a data logger. The four input terminals of the four-channel peristaltic pump are respectively connected to a silica-free water storage device, an ammonium molybdate storage device, an oxalic acid storage device, and a ferrous ammonium sulfate storage device. The four output terminals of the four-channel peristaltic pump are respectively equipped with silica-free water output pipes, ammonium molybdate output pipes, oxalic acid output pipes, and ferrous ammonium sulfate output pipes. The silica-free water output pipe is connected to the output terminal of the test solution storage device. The ammonium molybdate output pipe is connected to the connecting pipe between the test solution storage device and the first reaction coil. The oxalic acid output pipe is connected to the connecting pipe between the first and second reaction coils. The ferrous ammonium sulfate output pipe is connected to the connecting pipe between the second and third reaction coils.

2. The device for rapid determination of silicate content according to claim 1, characterized in that: The ammonium molybdate storage device contains 3%-7% ammonium molybdate solution, the oxalic acid storage device contains 7%-11% oxalic acid solution, and the ferrous ammonium sulfate storage device contains 4%-8% ferrous ammonium sulfate solution.

3. The device for rapid determination of silicate content according to claim 2, characterized in that: The ammonium molybdate storage device contains a 5% ammonium molybdate solution, the oxalic acid storage device contains a 9% oxalic acid solution, and the ferrous ammonium sulfate storage device contains a 6% ferrous ammonium sulfate solution.

4. The device for rapid determination of silicate content according to claim 1, characterized in that: The silicon-free water storage device stores silicon-free water, which is high-purity water with a conductivity of less than 0.06 μS / cm.

5. The device for rapid determination of silicate content according to claim 1, characterized in that: The speed of the four-channel peristaltic pump is controlled at 45 rpm.

6. The device for rapid determination of silicate content according to claim 1, characterized in that: The first reaction coil is 150cm long, the second reaction coil is 80cm long, and the third reaction coil is 50cm long.

7. The device for rapid determination of silicate content according to claim 1, characterized in that: The spectrophotometer has a 1cm optical path flow cell.

8. The device for rapid determination of silicate content according to claim 1, characterized in that: The absorption wavelength of the spectrophotometer is selected as 800 nm.

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