Online monitoring system suitable for calcium carbonate supersaturated water environment

Abstract

The utility model discloses an on-line monitoring system suitable for a calcium carbonate supersaturated water environment. The on-line monitoring system comprises a wastewater tank, a sampling pipe, a dilute acid dosing device, a cleaning pipe, a flushing device, a flow cell, a drain pipe, a bottom discharge pipe and an on-line monitoring instrument, an outlet of the waste water tank is communicated with an inlet of the sampling pipe, an outlet of the dilute acid dosing device is communicated with an inlet of the cleaning pipe, an outlet of the flushing device is communicated with the inlet of the cleaning pipe, an outlet of the cleaning pipe is communicated with an inlet of the sampling pipe, and an outlet of the sampling pipe is communicated with a water inlet in the side face of the bottom of the flow cell. A water outlet in the side face of the top of the flow cell is communicated with a drainage pipe, an outlet in the bottom of the flow cell is communicated with a bottom discharge pipe, a flow cell cover is arranged at an opening in the top of the flow cell, an online monitoring instrument penetrates through the flow cell cover to be inserted into the flow cell, and the system can monitor saturated solutions of all waste water systems of a power plant.

Description

Technical Field

[0001] The utility model belongs to the technical field of wastewater treatment, and relates to an on-line monitoring system applicable to a calcium carbonate supersaturated water environment. Background Art

[0002] In each water system of a thermal power plant, in the circulating water system, desulfurization system, ash and slag removal system, etc., due to differences in makeup water quality, wastewater temperature, concentration ratio, etc., the system wastewater may be in a nearly saturated state at the flow-through equipment and pipelines, and then scale formation risks may be caused inside the pipelines and equipment, endangering the safe operation of the system. On-site, there are risks of system scaling and corrosion caused by blind chemical dosing due to the failure to timely master the wastewater quality with scaling tendency or the failure to timely change the system operation mode. During the continuous evaporation and concentration of the power plant circulating water, the concentrations of Ca 2+ , HCO 3 - increase and a large amount of loss of CO 2 both promote the increase of CO 3 2- concentration and the rise of pH value in the water. When the circulating water is concentrated to a certain extent, calcium carbonate will precipitate due to gradually exceeding its solubility. In addition, in recent years, some power plants using wet slag removal replenish high-salt wastewater such as desulfurization wastewater and circulating water system drainage into the slag system. Due to the relatively high temperature of the wastewater in the slag water system, the high-salt wastewater will be further concentrated, and problems such as corrosion and scaling may also occur in the slag water system. For another example, the desulfurization wastewater system generally adopts the "three-compartment box" treatment process. In the neutralization unit, lime needs to be added to adjust the pH value of the wastewater to 9.0 - 9.5. Many power plants often add too much lime, which causes scaling of subsequent pipelines and related equipment, thereby affecting the system output. During the operation of each wastewater system, there are many systems involving solutions close to the saturated state that do not have real-time monitoring devices. Content of the Utility Model

[0003] The purpose of the utility model is to overcome the above-mentioned shortcomings of the prior art, and provides an on-line monitoring system applicable to a calcium carbonate supersaturated water environment, which can monitor the saturated solutions of each wastewater system in a power plant.

[0004] To achieve the above purpose, the utility model discloses an on-line monitoring system applicable to a calcium carbonate supersaturated water environment, including a wastewater tank, a sampling pipe, a dilute acid dosing device, a cleaning pipe, a flushing device, a flow-through cell, a drain pipe, a bottom drain pipe and on-line monitoring instruments;

[0005] The outlet of the wastewater tank is communicated with the inlet of the sampling pipe. The outlet of the dilute acid dosing device is communicated with the inlet of the cleaning pipe. The outlet of the flushing device is communicated with the inlet of the cleaning pipe. The outlet of the cleaning pipe is communicated with the inlet of the sampling pipe. The outlet of the sampling pipe is communicated with the water inlet on the side of the bottom of the flow cell. The water outlet on the side of the top of the flow cell is communicated with the drain pipe. The outlet at the bottom of the flow cell is communicated with the bottom drain pipe. A flow cell cover is provided at the top opening of the flow cell, and the on-line monitoring instrument passes through the flow cell cover and is inserted into the flow cell.

[0006] The outlet of the wastewater tank is communicated with the inlet of the sampling pipe through a sampling valve.

[0007] The outlet of the dilute acid dosing device is communicated with the inlet of the cleaning pipe through an acid isolation valve.

[0008] The outlet of the flushing device is communicated with the inlet of the cleaning pipe through a flushing isolation valve.

[0009] The outlet of the cleaning pipe is communicated with the inlet of the sampling pipe through a cleaning isolation valve.

[0010] A bottom drain valve is provided on the bottom drain pipe.

[0011] It further includes a controller, and the controller is connected to the sampling valve, the acid isolation valve, the flushing isolation valve, the cleaning isolation valve and the bottom drain valve.

[0012] The controller is connected to the flushing isolation valve, the acid isolation valve, the cleaning isolation valve, the sampling valve and the bottom drain valve through a data transmission line.

[0013] The outlet of the dilute acid dosing device is communicated with the inlet of the cleaning pipe through an acid isolation valve;

[0014] The outlet of the flushing device is communicated with the inlet of the cleaning pipe through a flushing isolation valve;

[0015] The outlet of the cleaning pipe is communicated with the inlet of the sampling pipe through a cleaning isolation valve.

[0016] The outlet of the wastewater tank is communicated with the inlet of the sampling pipe through a sampling valve;

[0017] A bottom drain valve is provided on the bottom drain pipe.

[0018] The utility model has the following beneficial effects:

[0019] When the on - line monitoring system applicable to the calcium carbonate supersaturated water environment described in the utility model is in specific operation, the to - be - measured saturated solution in the waste water tank enters the flow - through cell through the sampling pipe via the water inlet on the side of the bottom of the flow - through cell. The supersaturated solution is monitored in real time by on - line monitoring instruments, and then the measurement results are output. During cleaning, first start the pickling operation to pickle the pipeline. The pickling waste liquid is discharged into the flow - through cell along the cleaning pipe. After the pickling is completed, industrial water is used to conduct a secondary flushing on the parts and pipelines pickled in the previous step. The flushing waste water is discharged into the flow - through cell along the cleaning pipe. After the cleaning operation is completed, the waste liquid in the flow - through cell is discharged through the bottom discharge pipe to complete the entire monitoring and cleaning process.

[0020] Further, the controller is connected to the flushing isolation valve, acid isolation valve, cleaning isolation valve, sampling valve and bottom discharge valve through a data transmission line, and the control of the valves is realized through the controller.

[0021] Further, the controller is connected to the on - line monitoring instrument to realize the transmission of the data measured by the on - line monitoring instrument. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The schematic diagram of the drawings forming a part of the present utility model is used to provide a further understanding of the present utility model. The schematic embodiments and descriptions thereof of the present utility model are used to explain the present utility model and do not constitute an improper limitation to the present utility model. In the drawings:

[0023] Figure 1 is the structural schematic diagram of the present utility model.

[0024] Among them, 1 is the controller, 2 is the waste water tank, 3 is the dilute acid dosing device, 4 is the flushing device, 5 is the flushing isolation valve, 6 is the acid isolation valve, 7 is the cleaning pipe, 8 is the on - line monitoring instrument, 9 is the cleaning isolation valve, 10 is the flow - through cell cover, 11 is the sampling pipe, 12 is the sampling valve, 13 is the flow - through cell, 14 is the bottom discharge pipe, 15 is the bottom discharge valve, 16 is the drain pipe, 17 is the data transmission line. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] In order to enable those skilled in the art of this technology to better understand the solution of the present utility model, the technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, not all of the embodiments, and are not intended to limit the scope of the present utility model disclosure. In addition, in the following description, the description of well - known structures and technologies is omitted to avoid unnecessarily confusing the concepts disclosed in the present utility model. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the scope of protection of the present utility model.

[0026] The structural schematic diagrams according to the disclosed embodiments of the present utility model are shown in the accompanying drawings. These drawings are not drawn to scale, where for the purpose of clear expression, certain details are enlarged and some details may be omitted. The shapes of various regions and layers shown in the drawings, as well as their relative sizes and positional relationships, are merely exemplary. In practice, there may be deviations due to manufacturing tolerances or technical limitations, and those skilled in the art can design regions / layers with different shapes, sizes, and relative positions according to actual needs.

[0027] Embodiment 1

[0028] Reference Figure 1 , the on-line monitoring system applicable to a calcium carbonate supersaturated water environment described in the present utility model includes a controller 1, a waste water tank 2, a dilute acid dosing device 3, a flushing device 4, a flushing isolation valve 5, an acid isolation valve 6, a cleaning pipe 7, an on-line monitoring instrument 8, a cleaning isolation valve 9, a flow cell cover 10, a sampling pipe 11, a sampling valve 12, a flow cell 13, a bottom drain pipe 14, a bottom drain valve 15, a drain pipe 16, and a data transmission line 17;

[0029] The outlet of the waste water tank 2 is connected to the inlet of the sampling pipe 11 through the sampling valve 12. The outlet of the dilute acid dosing device 3 is connected to the inlet of the cleaning pipe 7 through the acid isolation valve 6 for controlling the dilute acid dosing and cleaning operation. The outlet of the flushing device 4 is connected to the inlet of the cleaning pipe 7 through the flushing isolation valve 5 for controlling the flushing pipeline operation. The flushing device 4 generally starts after pickling to flush the residual acid liquid inside the flow-through pipeline and valves. The flushing can use the industrial water of the power plant. The outlet of the cleaning pipe 7 is connected to the inlet of the sampling pipe 11 through the cleaning isolation valve 9. The outlet of the sampling pipe 11 is connected to the water inlet on the bottom side of the flow cell 13. The water outlet on the top side of the flow cell 13 is connected to the drain pipe 16. The outlet at the bottom of the flow cell 13 is connected to the bottom drain pipe 14. A bottom drain valve 15 is provided on the bottom drain pipe 14. A flow cell cover 10 is provided at the top opening of the flow cell 13. The on-line monitoring instrument 8 passes through the flow cell cover 10 and is inserted into the flow cell 13. The water quality of the to-be-detected saturated solution is monitored in real time through the on-line monitoring instrument 8, so as to master its water quality index and adjust the operation conditions according to the water quality.

[0030] As an implementation manner of the present utility model, the controller 1 is connected to the flushing isolation valve 5, the acid isolation valve 6, the cleaning isolation valve 9, the sampling valve 12, and the bottom drain valve 15 through the data transmission line 17.

[0031] Embodiment 2

[0032] This embodiment discloses a working method of an on-line monitoring system applicable to a calcium carbonate supersaturated water environment. The on-line monitoring system applicable to a calcium carbonate supersaturated water environment includes a wastewater tank 2, a sampling pipe 11, a dilute acid dosing device 3, a cleaning pipe 7, a flushing device 4, a flow-through cell 13, a drain pipe 16, a bottom drain pipe 14 and an on-line monitoring instrument 8. The outlet of the wastewater tank 2 is communicated with the inlet of the sampling pipe 11. The outlet of the dilute acid dosing device 3 is communicated with the inlet of the cleaning pipe 7. The outlet of the flushing device 4 is communicated with the inlet of the cleaning pipe 7. The outlet of the cleaning pipe 7 is communicated with the inlet of the sampling pipe 11. The outlet of the sampling pipe 11 is communicated with the water inlet on the side of the bottom of the flow-through cell 13. The water outlet on the side of the top of the flow-through cell 13 is connected to the drain pipe 16. The outlet at the bottom of the flow-through cell 13 is connected to the bottom drain pipe 14. A flow-through cell cover 10 is provided at the top opening of the flow-through cell 13, and the on-line monitoring instrument 8 passes through the flow-through cell cover 10 and is inserted into the flow-through cell 13. The outlet of the dilute acid dosing device 3 is communicated with the inlet of the cleaning pipe 7 through an acid isolation valve 6. The outlet of the flushing device 4 is communicated with the inlet of the cleaning pipe 7 through a flushing isolation valve 5. The outlet of the cleaning pipe 7 is communicated with the inlet of the sampling pipe 11 through a cleaning isolation valve 9. The outlet of the wastewater tank 2 is communicated with the inlet of the sampling pipe 11 through a sampling valve 12. A bottom drain valve 15 is provided on the bottom drain pipe 14. The controller 1 is connected to the flushing isolation valve 5, the acid isolation valve 6, the cleaning isolation valve 9, the sampling valve 12 and the bottom drain valve 15 through a data transmission line 17. The control of the flushing isolation valve 5, the acid isolation valve 6, the cleaning isolation valve 9, the sampling valve 12 and the bottom drain valve 15 is realized through the controller 1, and the data detected by the on-line monitoring instrument 8 is sent to an external device.

[0033] Reference Figure 1 , the working method of the on-line monitoring system applicable to a calcium carbonate supersaturated water environment of the present utility model includes the following steps:

[0034] The saturated solution to be tested placed in the wastewater tank 2 is transported to the flow cell 13 through the sampling valve 12 and the sampling pipe 11 via the water inlet on the side of the bottom of the flow cell 13. The online monitoring instrument 8 is used to monitor the supersaturated solution in real time (mainly measuring indicators such as calcium hardness, pH value, alkalinity, etc.); the operation control of the system is guided according to the monitored water quality results (such as chemical dosing control, makeup water ratio control, sewage discharge control, and startup and closing of the cleaning system, etc.). Since the solution to be tested is a supersaturated solution, it will inevitably cause scaling problems in the flow valves and pipelines. Therefore, it needs to be cleaned regularly to ensure the normal operation of the entire set of equipment. During cleaning, first, the acid isolation valve 6 and the cleaning isolation valve 9 are opened through the controller, the sampling valve 12 is closed, and the pickling operation is started to pickle the pipeline. The pickling waste liquid is discharged into the flow cell 13 along the cleaning pipe 7. After the pickling is completed, the acid isolation valve 6 is closed through the controller, the flushing isolation valve 5 is opened, and water with better quality such as industrial water is used to perform a secondary flushing on the parts and pipelines pickled in the previous step. The flushing wastewater is discharged into the flow cell 13 along the cleaning pipe 7. The flow cell 13 operates in a bottom-in and top-out manner, and it is mainly used to collect the solution to be tested and the cleaning waste liquid. After each cleaning operation is completed, the bottom drain valve 15 is opened through the controller, and the cleaning waste liquid is discharged along the bottom drain pipe 14 to complete the entire monitoring and cleaning process. The entire monitoring device is in a dynamic operating state. The flow cell 13 continuously intakes water, the drain pipe 16 continuously discharges water, the online monitoring instrument 8 monitors the water quality of the supersaturated wastewater in real time, and the waste liquid in the flow cell 13 is discharged regularly through the bottom drain pipe 14 and the bottom drain valve 15.

[0035] It should be noted that the present utility model monitors the supersaturated solution in real time through the online monitoring instrument 8, mainly measuring indicators such as calcium hardness, pH value, alkalinity, etc., and is used to monitor the saturated solution of each wastewater system in the power plant in real time, timely grasp the wastewater quality, judge the scaling tendency, and provide a data basis for guiding the adjustment of the operation modes of each system. For example, chemical dosing control, makeup water ratio control, sewage discharge control, and startup and closing of the cleaning system, to ensure the safe and stable operation of each water system.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present utility model and are not intended to limit it. Although the present utility model has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications or equivalent replacements can still be made to the specific implementation manners of the present utility model. Any modification or equivalent replacement that does not depart from the spirit and scope of the present utility model shall be covered by the protection scope of the claims of the present utility model.

Claims

1. An online monitoring system suitable for calcium carbonate supersaturated water environment, characterized in that: It comprises a waste water tank (2), a sampling tube (11), a dilute acid dosing device (3), a cleaning tube (7), a flushing device (4), a circulation pool (13), a drainage pipe (16), a bottom drainage pipe (14) and an online monitoring instrument (8); The outlet of the wastewater tank (2) is connected to the inlet of the sampling tube (11), the outlet of the dilute acid dosing device (3) is connected to the inlet of the cleaning tube (7), the outlet of the flushing device (4) is connected to the inlet of the cleaning tube (7), the outlet of the cleaning tube (7) is connected to the inlet of the sampling tube (11), the outlet of the sampling tube (11) is connected to the water inlet on the bottom side of the circulation pool (13), the water outlet on the top side of the circulation pool (13) is connected to the drain pipe (16), the outlet at the bottom of the circulation pool (13) is connected to the bottom drain pipe (14), a circulation pool cover (10) is provided at the top opening of the circulation pool (13), and an online monitoring instrument (8) is inserted into the circulation pool (13) through the circulation pool cover (10).

2. The online monitoring system applicable to calcium carbonate supersaturated water environment according to claim 1, characterized in that, The outlet of the wastewater tank (2) is connected to the inlet of the sampling tube (11) via a sampling valve (12).

3. The online monitoring system applicable to calcium carbonate supersaturated water environment according to claim 1, characterized in that, The outlet of the dilute acid dosing device (3) is connected to the inlet of the cleaning pipe (7) via the acid isolation valve (6).

4. The online monitoring system applicable to calcium carbonate supersaturated water environment according to claim 1, characterized in that: The outlet of the flushing device (4) is connected to the inlet of the cleaning pipe (7) via the flushing isolation valve (5).

5. The online monitoring system applicable to calcium carbonate supersaturated water environment according to claim 1, characterized in that: The outlet of the cleaning pipe (7) is connected to the inlet of the sampling pipe (11) via the cleaning isolation valve (9).

6. The online monitoring system applicable to calcium carbonate supersaturated water environment according to claim 1, characterized in that: The bottom discharge pipe (14) is provided with a bottom discharge valve (15).

7. The online monitoring system applicable to calcium carbonate supersaturated water environment according to claim 1, characterized in that: It also comprises a controller, which is connected to the sampling valve (12), the acid isolation valve (6), the flushing isolation valve (5), the cleaning isolation valve (9) and the bottom drain valve (15).

8. The online monitoring system for calcium carbonate supersaturated water environment according to claim 7, characterized in that: The controller (1) is connected to the flushing isolation valve (5), the acid isolation valve (6), the cleaning isolation valve (9), the sampling valve (12) and the bottom drain valve (15) via a data transmission line (17).

9. The online monitoring system applicable to calcium carbonate supersaturated water environment according to claim 1, characterized in that: The outlet of the dilute acid dosing device (3) is connected to the inlet of the cleaning pipe (7) via the acid isolation valve (6); The outlet of the flushing device (4) is connected to the inlet of the cleaning pipe (7) via the flushing isolation valve (5); The outlet of the cleaning pipe (7) is connected to the inlet of the sampling pipe (11) via the cleaning isolation valve (9).

10. The online monitoring system applicable to calcium carbonate supersaturated water environment according to claim 1, characterized in that: The outlet of the wastewater tank (2) is connected to the inlet of the sampling tube (11) via a sampling valve (12); The bottom discharge pipe (14) is provided with a bottom discharge valve (15).

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