Constant flow system for chemical sampling water of thermal power plant

Abstract

The utility model discloses a thermal power plant chemical sampling water constant flow system which comprises a steam-water system main pipe, a first sampling pipeline, a second sampling pipeline and a buffer overflow tank, the first sampling pipeline is respectively connected with the steam-water system main pipe and the water inlet end of the buffer overflow tank, and the second sampling pipeline is connected with the water outlet end of the buffer overflow tank. The system further comprises a first constant current device which is arranged on the first sampling pipeline; the first constant flow device is used for carrying out constant flow treatment on sampling water in the first sampling pipeline; the buffer overflow tank is used for stabilizing the pressure and flow of the sampled water and conveying the sampled water to the outside through the second sampling pipeline for sampling analysis. The water sampling device can ensure the accuracy and the stability of sampled water.

Description

TECHNICAL FIELD

[0001] The utility model relates to chemical water treatment technical field especially relates to a constant flow system of chemical sampling water of thermal power plant. BACKGROUND

[0002] In thermal power plant, chemical sampling water is usually sampled from boiler make-up water, condensate water and the like, and then subsequent chemical analysis is carried out, and the premise of general chemical analysis is to ensure the accuracy and stability of water sample, so as to ensure that the dosing amount of water quality can be accurately adjusted according to the analysis result, and then the water quality is improved.

[0003] However, at present, the chemical sampling water of thermal power plant is drained from the steam-water system main pipe to the sampling pipeline without adopting the buffer constant flow device, and the unstable sampling water flow leads to unstable sampling, which is easy to cause inaccurate chemical instrument measurement, and inaccurate instrument data will affect the dosing amount of water quality adjustment, and inaccurate dosing amount will affect water quality, and poor water quality will affect the service life of unit pipeline and rotor. Therefore, it is necessary to provide a device or system capable of ensuring the accuracy and stability of sampling water. SUMMARY

[0004] The utility model aims at solving the technical problems in the prior art at least to some extent. Therefore, the purpose of the utility model is to provide a constant flow system of chemical sampling water of thermal power plant, which can ensure the accuracy and stability of sampling water.

[0005] In order to achieve the above purpose, the utility model realizes the following technical scheme:

[0006] A constant flow system of chemical sampling water of thermal power plant, comprising a steam-water system main pipe, a first sampling pipeline, a second sampling pipeline and a buffer overflow tank, the first sampling pipeline is connected with the water inlet end of the steam-water system main pipe and the buffer overflow tank respectively, the second sampling pipeline is connected with the water outlet end of the buffer overflow tank, the system further comprises a first constant flow device, and the first constant flow device is arranged on the first sampling pipeline; the first constant flow device is used for constant flow treatment of sampling water in the first sampling pipeline; the buffer overflow tank is used for stabilizing the pressure and flow of sampling water, and the sampling water is delivered to the outside through the second sampling pipeline for sampling analysis.

[0007] Preferably, the system further comprises a second constant flow device arranged on the second sampling pipeline.

[0008] Preferably, the first constant flow device and the second constant flow device are the same in structure, the first constant flow device or the second constant flow device comprises a controller, a flow meter and a flow adjusting device, the flow meter and the flow adjusting device are connected with the controller, and the flow meter and the flow adjusting device are arranged on the sampling pipeline.

[0009] Preferably, the system further comprises a multi-in-one electrode cup, and the second sampling pipeline is connected with the multi-in-one electrode cup.

[0010] Preferably, at least one group of electrodes is inserted into the multi-in-one electrode cup.

[0011] Preferably, the system further comprises a chemical instrument control cabinet, and the chemical instrument control cabinet samples and analyzes the sampled water in the multi-in-one electrode cup through the at least one group of electrodes.

[0012] Preferably, the at least one group of electrodes comprises a PH electrode, a conductivity electrode and a sodium ion electrode.

[0013] Preferably, the first sampling pipeline and the second sampling pipeline are both provided with sampling valves.

[0014] Preferably, the buffer overflow tank and the multi-in-one electrode cup are both provided with overflow pipes.

[0015] Preferably, the controller is a PLC controller, and the flow regulating device is an electric regulating ball valve.

[0016] The utility model at least has following technical effect:

[0017] The utility model sets two-stage buffer constant flow device in sampling water pipeline, that is, sampling pipeline, first, ensure the flow stability, it can make the water flow velocity of sampling keep constant, in thermal power plant, no matter other working condition such as pipeline pressure change, equipment start-stop etc. change, can provide stable flow water sample for chemical analysis, guarantee the accuracy of analysis result. Second, guarantee accurate sampling, that is, can obtain representative sample according to predetermined, stable flow, like this, it is helpful to long-term, effective monitoring of water quality, such as monitoring the acid-base degree, hardness, dissolved oxygen, metal ion concentration etc. various key indexes in water, guarantee the safe and stable operation of water pipeline and water turbine blade.

[0018] Additional aspects and advantages of the utility model will be partially given in the following description, partially become obvious from the following description, or be understood by the practice of the utility model. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is the structure schematic drawing of the constant flow system of thermal power plant chemical sampling water of the utility model embodiment.

[0020] Figure 2 It is the structure schematic drawing of the constant flow device of the utility model embodiment. DETAILED DESCRIPTION

[0021] The embodiments are described in detail below with reference to the accompanying drawings, wherein the same or like designations denote the same or like elements or elements having the same or similar functions throughout the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present application, and cannot be understood as limiting the present application.

[0022] The constant flow system for chemical sampling water of a thermal power plant according to the present embodiment is described below with reference to the accompanying drawings.

[0023] Figure 1 FIG. 1 is a structural schematic diagram of the constant flow system for chemical sampling water of a thermal power plant according to the present embodiment. As shown in the figure, the system comprises a steam-water system main pipe 1, a first sampling pipeline, a second sampling pipeline and a buffer overflow tank 2, the first sampling pipeline is connected with the steam-water system main pipe 1 and the water inlet end of the buffer overflow tank 2 respectively, the second sampling pipeline is connected with the water outlet end of the buffer overflow tank 2, and the system further comprises a first constant flow device 3, which is arranged on the first sampling pipeline. Figure 1 The first constant flow device 3 is used for constant flow treatment of the sampling water in the first sampling pipeline, and the buffer overflow tank 2 is used for stabilizing the pressure and flow of the sampling water and conveying the sampling water to the outside through the second sampling pipeline for sampling analysis.

[0024] Further, the system further comprises a second constant flow device 4, which is arranged on the second sampling pipeline.

[0025] In the present embodiment, the first constant flow device 3 and the second constant flow device 4 are the same in structure, and the first constant flow device or the second constant flow device comprises a controller 11, a flow meter 12 and a flow adjusting device 13, as shown in FIG. 2, the flow meter 12 and the flow adjusting device 13 are connected with the controller 11, and the flow meter 12 and the flow adjusting device 13 are arranged on the sampling pipeline. Figure 2

[0026] The controller is a PLC (programmable logic controller) controller, and the flow adjusting device is a small electric regulating ball valve. In the present embodiment, the PLC controller can perform an algorithm, which can perform basic arithmetic operations. In the constant flow device, the PLC can calculate the difference of the sampling water flow, that is, the difference is obtained by subtracting the actual measured flow from the set target flow, and then the flow adjusting device is instructed to adjust the flow, so that the sampling water flow reaches the constant flow purpose.

[0027] ​Further, the system further comprises a multi-purpose electrode cup 5, and the second sampling pipeline is connected with the multi-purpose electrode cup 5. The system further comprises a chemical instrument control cabinet 6, wherein instruments for performing various chemical analyses are arranged. At least one group of electrodes is inserted into the multi-purpose electrode cup 5, and the at least one group of electrodes comprises a PH electrode, a conductivity electrode and a sodium ion electrode. The various instruments in the chemical instrument control cabinet 6 perform sampling analysis on the sampling water in the multi-purpose electrode cup 5 through the multiple groups of electrodes.

[0028] Further, the first sampling pipeline and the second sampling pipeline are both provided with sampling valves. Specifically, the first sampling pipeline is provided with a first sampling valve 7, and the second sampling pipeline is provided with a second sampling valve 8. When the first sampling valve 7 is opened, the first sampling pipeline samples the sampling water from the steam-water system main pipeline 1. When the second sampling valve 8 is opened, the second sampling pipeline samples the sampling water after the first constant flow treatment from the buffer overflow tank 2. In order to prevent overflow, the buffer overflow tank 2 is provided with a first overflow pipe 9, and the multi-purpose electrode cup 5 is provided with a second overflow pipe 10, so that the overflow water can be transported to other storage places through the overflow pipes.

[0029] The working principle of the utility model is as follows: in the process of sampling and analyzing the chemical water, the first sampling pipeline samples the sampling water from the steam-water system main pipeline 1, and the sampling water passes through the first sampling valve 7 and enters the buffer overflow tank 2 through the first constant flow device 3, i.e. a first-stage constant flow device (this stage of constant flow device is mainly designed for the steam-water system main pipeline 1, because the flow and pressure of the sampling water from the steam-water system main pipeline 1 fluctuate greatly, so a first-stage constant flow device is needed). The buffer overflow tank 2 stores a certain amount of sampling water, and then the second sampling valve 8 is opened. After the sampling water in the buffer overflow tank 2 passes through the second constant flow device 4, i.e. another stage of constant flow device (this stage of constant flow device is mainly designed for the buffer overflow tank 2. After the sampling water in the buffer overflow tank 2 passes through the first-stage constant flow device, the flow and pressure of the water are obviously reduced), the stable sampling water enters the multi-purpose sampling electrode cup 5. The multi-purpose electrode cup 5 can be inserted into the PH electrode, the conductivity electrode and the sodium ion electrode, so that the instruments can obtain constant-flow stable sampling water. The real-time data are analyzed through the instrument device, and then transmitted to the DCS (distributed control) system through a data line. The terminal staff of the centralized control monitors and operates according to the water quality data.

[0030] The utility model has the following technical effects:

[0031] (1) Application of multi-stage constant flow device

[0032] The utility model discloses a two -stage constant current device is adopted in sampling system, is designed respectively to steam -water system main pipe and buffer overflow tank. The first constant current device is used to stabilize the flow and pressure of steam -water system main pipe sampling water, and the second constant current device further optimizes the sampling water parameter of buffer overflow tank. Its advantage lies in, the traditional sampling system usually only adopts single -stage constant current device, and it is difficult to deal with the problem that steam -water system main pipe sampling water flow and pressure fluctuate greatly. But the utility model discloses more accurate flow and pressure control through two -stage constant current device, and the stability of sampling water is improved significantly.

[0033] (2) the design of buffer overflow tank

[0034] The design of buffer overflow tank provides an intermediate storage link for sampling water, further stabilizing the pressure and flow of sampling water. Its advantage lies in that the design of buffer overflow tank can effectively alleviate the influence of steam -water system main pipe sampling water fluctuation on subsequent instruments, and ensure that the water sample entering the multifunctional sampling electrode cup is more stable.

[0035] (3) the design of multifunctional sampling electrode cup

[0036] The multifunctional sampling electrode cup, namely the all-in-one electrode cup, allows multiple electrodes (such as pH electrode, conductivity electrode, sodium ion electrode) to be inserted simultaneously, achieving simultaneous monitoring of multiple water quality parameters. Its advantage lies in that the traditional sampling system usually needs multiple independent sampling points or devices to complete the measurement of different parameters, while the utility model simplifies the system design through a multifunctional sampling electrode cup, improving the efficiency.

[0037] (4) overall system integration

[0038] The scheme organically combines the multi-stage constant current device, buffer overflow tank and multifunctional sampling electrode cup, forming a complete steam -water system water sample supervision solution. Compared with the traditional sampling system, the scheme has significant improvement in stability, accuracy and integration.

[0039] It should be noted that, in this text, relational terms such as first and second are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment. Without more limitations, the element defined by the statement "including a" does not exclude the presence of another identical element in the process, method, article or equipment including the element.

[0040] Although the content of the utility model has been introduced in detail through the above preferred embodiments, it should be recognized that the above description should not be considered as a limitation of the utility model. After reading the above content, various modifications and substitutions of the utility model will be obvious to those skilled in the art. Therefore, the protection scope of the utility model should be limited by the attached claims.

Claims

1. A constant flow system for chemically sampled water in a thermal power plant, characterized in that, The system includes a main steam-water system pipe, a first sampling pipeline, a second sampling pipeline, and a buffer overflow tank. The first sampling pipeline is connected to the inlet of both the main steam-water system pipe and the buffer overflow tank. The second sampling pipeline is connected to the outlet of the buffer overflow tank. The system also includes a first constant flow device, which is installed on the first sampling pipeline. The first constant flow device is used to maintain a constant flow for the sampled water in the first sampling pipeline. The buffer overflow tank is used to stabilize the pressure and flow rate of the sampled water and to transport the sampled water to the outside for sampling and analysis via the second sampling pipeline.

2. The constant flow system for chemical sampling water in a thermal power plant as described in claim 1, characterized in that, The system also includes a second constant current device, which is installed on the second sampling pipeline.

3. The constant flow system for chemical sampling water in a thermal power plant as described in claim 2, characterized in that, The first constant flow device and the second constant flow device have the same structure. The first constant flow device or the second constant flow device includes a controller, a flow meter and a flow regulating device. The flow meter and the flow regulating device are both connected to the controller and are both installed on the sampling pipeline.

4. The constant flow system for chemical sampling water in a thermal power plant as described in claim 2, characterized in that, The system also includes an all-in-one electrode cup, and the second sampling line is connected to the all-in-one electrode cup.

5. The constant flow system for chemical sampling water in a thermal power plant as described in claim 4, characterized in that, At least one set of electrodes is inserted into the all-in-one electrode cup.

6. The constant flow system for chemical sampling water in a thermal power plant as described in claim 5, characterized in that, The system also includes a chemical instrumentation control cabinet, which uses at least one set of electrodes to sample and analyze the water in the multi-electrode cup.

7. The constant flow system for chemical sampling water in a thermal power plant as described in claim 5 or 6, characterized in that, At least one set of electrodes includes a pH electrode, a conductivity electrode, and a sodium ion electrode.

8. The constant flow system for chemical sampling water in a thermal power plant as described in claim 1, characterized in that, Both the first sampling pipeline and the second sampling pipeline are equipped with sampling valves.

9. The constant flow system for chemical sampling water in a thermal power plant as described in claim 4, characterized in that, Both the buffer overflow tank and the all-in-one electrode cup are equipped with overflow pipes.

10. The constant flow system for chemical sampling water in a thermal power plant as described in claim 3, characterized in that, The controller is a PLC controller, and the flow regulating device is an electric regulating ball valve.

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