Chemical water pretreatment monitoring system

Abstract

The utility model relates to a chemical water pretreatment monitoring system, belongs to the technical field of water treatment, and solves the problem that existing untreated natural water or improperly treated natural water aggravates damage and aging of thermal equipment. The system comprises a PLC (Programmable Logic Controller), a water inlet device, a raw water heating device, a clarification device and a water outlet device which are electrically connected with the PLC, and a monitoring device which is in network connection with the PLC, the water inlet device, the raw water heating device, the clarification device and the water outlet device are sequentially connected through pipelines; the clarification device comprises three clarification tanks, clarification water tanks in one-to-one correspondence with the clarification tanks and five clarification water pumps; water inlets of the clarification tanks are connected through pipelines and then are connected with a water outlet pipeline of the raw water heating device, and a water outlet of each clarification tank is connected with a water inlet pipeline of the corresponding clarification water tank; the water outlets of the clarification water tanks are connected through pipelines and then are connected with the water inlets of the clarification water pumps through pipelines. The pretreatment of the chemical water and the monitoring of the pretreatment process are realized.

Description

Technical Field

[0001] The utility model relates to the technical field of water treatment, in particular to a chemical water pretreatment monitoring system. Background Technique

[0002] The working principle of thermal power generation is to use fossil fuels (usually coal, oil or natural gas), heat the water in the boiler through the heat energy generated by combustion, generate high-temperature and high-pressure steam in the boiler, drive the impeller of the turbine, and then drive the rotor of the generator to release electric energy. Power plants that use coal, oil or natural gas as fuel are called thermal power plants.

[0003] In the production process of thermal power plants, water plays an important role in energy transfer and is also a cooling medium. Years of practical experience have shown that the quality of water and steam in the thermal system of thermal power plants is one of the most important factors affecting the safe and economic operation of thermal equipment (such as boilers and steam turbines). Untreated natural water contains many impurities and should not enter the steam cycle. To ensure good water quality in thermal power plants, natural water must be properly purified and treated, and strictly monitored to prevent untreated or improperly treated natural water from affecting thermal equipment and exacerbating the damage and aging of thermal equipment.

[0004] Therefore, there is an urgent need for a chemical water pretreatment monitoring system to pre-treat and monitor untreated natural water. Content of the Utility Model

[0005] In view of the above analysis, the utility model aims to provide a chemical water pretreatment monitoring system to solve the problem that untreated or improperly treated natural water exacerbates the damage and aging of thermal equipment.

[0006] The purpose of the utility model is mainly achieved through the following technical solutions:

[0007] The utility model provides a chemical water pretreatment monitoring system, including a PLC controller, a water inlet device, a raw water heating device, a clarification device, a water outlet device electrically connected to the PLC controller, and a monitoring device network-connected to the PLC controller; wherein, the water inlet device, the raw water heating device, the clarification device and the water outlet device are sequentially connected by pipelines; wherein,

[0008] The clarification device includes three clarification ponds, clarification water tanks corresponding to each of the clarification ponds one by one, and five clarification water pumps; the inlet pipelines of each clarification pond are connected after being joined as the inlet of the clarification device and are connected to the outlet pipeline of the raw water heating device; the outlet of each clarification pond is connected to the inlet of the corresponding clarification water tank through a pipeline; the outlet pipelines of each clarification water tank are connected after being joined and are simultaneously connected to the inlet pipelines of each clarification water pump; the outlet pipelines of each clarification water pump are connected after being joined and are connected to the inlet pipeline of the outlet device.

[0009] Based on a further improvement of the above solution, the clarification device further includes a coagulant aid dosing unit; the coagulant aid dosing unit includes two coagulant aid tanks and three coagulant aid dosing pumps;

[0010] The inlet of each coagulant aid tank is connected to the outlet pipeline of the outlet device, and the outlet pipelines of each coagulant aid tank are connected after being joined and are simultaneously connected to the inlet pipelines of each coagulant aid dosing pump; the outlet of each coagulant aid dosing pump is connected to the first dosing inlet of each clarification pond in a one-to-one correspondence and through a pipeline.

[0011] Based on a further improvement of the above solution, the clarification device further includes a flocculant dosing unit; the flocculant dosing unit includes two flocculant tanks, three flocculant dosing pumps, one flocculant dosing auxiliary pump, one drug dissolving tank and one circulation pump;

[0012] The circulation inlet of the circulation pump is connected to the outlet of the drug dissolving tank through a pipeline, and the circulation outlet is connected to the inlet of the drug dissolving tank; the inlet of the drug dissolving tank is connected to the outlet pipeline of the outlet device; the inlet of each flocculant tank is connected to the outlet pipeline of the outlet device, and the outlet pipelines of each flocculant tank are connected after being joined and are simultaneously connected to the inlet pipelines of each flocculant dosing pump and the flocculant dosing auxiliary pump; the outlet of each flocculant dosing pump is connected to the outlet of the flocculant dosing auxiliary pump through a pipeline and is connected to the second dosing inlet of each clarification pond in a one-to-one correspondence; the inlet of each flocculant tank is connected to the circulation outlet pipeline of the circulation water pump.

[0013] Based on a further improvement of the above solution, the raw water heating device includes two steam inlet control valves, two raw water inlet control valves and two heat exchangers;

[0014] The steam inlet of each steam inlet control valve is connected to the steam outlet of the steam generator through a pipeline, and the steam outlet is connected to the steam inlet of the heat exchanger in a one-to-one correspondence; the water inlet of each heat exchanger is connected to the outlet pipeline of the inlet device, and the outlet pipelines are connected after being joined as the outlet of the raw water heating device and are connected to the inlet pipeline of the clarification device.

[0015] For a further improvement based on the above solution, the raw water heating device further includes two degassers; each degasser is arranged at the water outlet of each heat exchanger; the water outlets of each heat exchanger pass through the degassers respectively and are then connected by pipelines to serve as the water outlet of the raw water heating device and are connected to the clarification device by pipelines.

[0016] For a further improvement based on the above solution, the clarifying tank includes a water inlet regulating valve, a mechanical stirrer and three sewage valves; the water inlet regulating valve is arranged at the water inlet of the clarifying tank, the mechanical stirrer is arranged inside the clarifying tank, and each sewage valve is arranged at the bottom of the clarifying tank.

[0017] For a further improvement based on the above solution, a coagulant aid mechanical stirrer is arranged inside the coagulant aid tank.

[0018] For a further improvement based on the above solution, a coagulant mechanical stirrer is arranged inside the coagulant tank.

[0019] For a further improvement based on the above solution, the PLC controller is connected to the monitoring device through TCP / IP Ethernet.

[0020] For a further improvement based on the above solution, the PLC controller is a Siemens S7-200 SMART PLC, wherein the main unit is CPU ST30 and the expansion module is EM DE16.

[0021] Compared with the prior art, the present utility model can at least achieve one of the following beneficial effects:

[0022] A chemical water pretreatment monitoring system provided by the present utility model includes a PLC controller, a water inlet device, a raw water heating device, a clarification device, a water outlet device electrically connected to the PLC controller, and a monitoring device network-connected to the PLC controller. The water inlet device, the raw water heating device, the clarification device and the water outlet device are sequentially connected by pipelines. Through this system, the pretreatment of chemical water can be realized to obtain water with impurities removed; and the progress of the pretreatment process can be monitored and controlled, the pretreatment process can be strictly controlled, problems of improper treatment can be found in time, the reliability of the pretreatment can be improved, and the damage and aging of thermal equipment can be slowed down.

[0023] In the present utility model, the above technical solutions can also be combined with each other to realize more preferred combination schemes. Other features and advantages of the present utility model will be described in the following content, and some advantages can be made obvious from the specification or understood by implementing the present utility model. The purpose and other advantages of the present utility model can be realized and obtained through the content specifically pointed out in the text and the drawings. Description of the Drawings

[0024] The accompanying drawings are only for the purpose of showing specific embodiments and are not considered as limiting the present utility model. Throughout the drawings, the same reference signs denote the same components.

[0025] Figure 1 It is a schematic structural diagram of a chemical water pretreatment monitoring system provided by the present utility model;

[0026] Figure 2 It is a detailed structural connection schematic diagram of a chemical water pretreatment monitoring system provided by the present utility model;

[0027] Figure 3 It is a connection schematic diagram of a PLD controller provided by the present utility model;

[0028] Figure 4 It is a connection schematic diagram of an analog expansion module AM06 provided by the present utility model. Specific embodiments

[0029] The following will specifically describe the preferred embodiments of the present utility model in conjunction with the accompanying drawings. Among them, the accompanying drawings form a part of this application and are used together with the embodiments of the present utility model to explain the principle of the present utility model, rather than to limit the scope of the present utility model.

[0030] A specific embodiment of the present utility model discloses a chemical water pretreatment monitoring system, as Figure 1 shown, including a PLC controller, a water inlet device, a raw water heating device, a clarification device, a water outlet device electrically connected to the PLC controller, and a monitoring device network-connected to the PLC controller; wherein, the water inlet device, the raw water heating device, the clarification device, and the water outlet device are sequentially connected by pipelines; wherein, as Figure 2 shown,

[0031] The clarification device includes 3 clarification tanks, clarification water tanks corresponding to each clarification tank one by one, and 5 clarification water pumps; the inlet pipelines of each clarification tank are connected and used as the inlet of the clarification device to be connected to the outlet pipeline of the raw water heating device, the outlet of each clarification tank is connected to the inlet of the corresponding clarification water tank by a pipeline; the outlet pipelines of each clarification water tank are connected and simultaneously connected to the inlet pipelines of each clarification water pump; the outlet pipelines of each clarification water pump are connected and then connected to the inlet pipeline of the water outlet device.

[0032] Specifically, the clarification tank includes an inlet regulating valve, a mechanical stirrer, and 3 drain valves; the inlet regulating valve is arranged at the inlet of the clarification tank, the mechanical stirrer is arranged inside the clarification tank, and each drain valve is arranged at the bottom of the clarification tank.

[0033] During implementation, the clarification device further includes a coagulant aid dosing unit; the coagulant aid dosing unit includes 2 coagulant aid tanks and 3 coagulant aid dosing pumps;

[0034] The water inlet of each coagulant aid tank is connected to the water outlet of the water outlet device through a pipeline, and after the medicine outlet pipelines of each coagulant aid tank are connected, they are simultaneously connected to the medicine inlet of each coagulant aid dosing pump through a pipeline; the medicine outlet of each coagulant aid dosing pump is in one-to-one correspondence with the first medicine inlet of each clarifying tank and is connected through a pipeline.

[0035] Specifically, a coagulant aid mechanical stirrer is provided inside the coagulant aid tank.

[0036] During implementation, the clarification device further includes a flocculant dosing unit; the flocculant dosing unit includes 2 flocculant tanks, 3 flocculant dosing pumps, 1 flocculant dosing auxiliary pump, 1 medicine dissolving tank and 1 circulating pump;

[0037] The circulating inlet of the circulating pump is connected to the medicine outlet of the medicine dissolving tank through a pipeline, and the circulating outlet is connected to the medicine inlet of the medicine dissolving tank; the water inlet of the medicine dissolving tank is connected to the water outlet of the water outlet device through a pipeline; the water inlets of each flocculant tank are all connected to the water outlet of the water outlet device through a pipeline, and after the medicine outlet pipelines of each flocculant tank are connected, they are simultaneously connected to the medicine inlets of each flocculant dosing pump and the flocculant dosing auxiliary pump through a pipeline; the medicine outlets of each flocculant dosing pump are respectively connected to the medicine outlet of the flocculant dosing auxiliary pump through a pipeline and are in one-to-one correspondence with the second medicine inlet of each clarifying tank and are connected through a pipeline; the medicine inlets of each flocculant tank are all connected to the circulating outlet of the circulating water pump through a pipeline.

[0038] Specifically, a flocculant mechanical stirrer is provided inside the flocculant tank.

[0039] During implementation, the raw water heating device includes 2 steam inlet control valves, 2 raw water inlet control valves and 2 heat exchangers;

[0040] The steam inlet of each steam inlet control valve is connected to the steam outlet of the steam generator through a pipeline, and the steam outlet is in one-to-one correspondence with the steam inlet of the heat exchanger and is connected through a pipeline; the water inlets of each heat exchanger are all connected to the water outlet of the water inlet device through a pipeline, and after the water outlet pipelines are connected, they serve as the water outlet of the raw water heating device and are connected to the water inlet of the clarification device through a pipeline.

[0041] Preferably, the raw water heating device further includes 2 degassers; each degasser is arranged at the water outlet of each heat exchanger; the water outlets of each heat exchanger respectively pass through the degasser and then are connected through a pipeline to serve as the water outlet of the raw water heating device and are connected to the clarification device through a pipeline.

[0042] Specifically, during chemical water pretreatment, raw water is transported through the inlet device and the flow rate is controlled by the raw water inlet regulating valve, and then enters the heat exchanger. At the same time, steam is transported to the heat exchanger by controlling the steam volume through the steam inlet regulating valve. After the raw water is heated in the heat exchanger, it is degassed by the degasser and then transported to each clarifier. After adding flocculant and coagulant aid through the dosing unit for turbidity removal treatment, the treated water is transported to the clarified water tank for storage, removing suspended solids or impurities in the raw water to further purify the water quality. Then, it is transported to the outlet device after passing through five clarified water pumps.

[0043] During implementation, the PLC controller is connected to the monitoring device through TCP / IP Ethernet.

[0044] During implementation, the PLC controller is a Siemens S7-200 SMART PLC. Among them, the main unit is CPU ST30, and the expansion module is EM DE16.

[0045] It can be understood that the Siemens S7-200 SMART series PLC controller, as a classic product in the Siemens PLC control system, has many applications in the industrial production industry. Its functional characteristics are rich, which can meet most production needs, with low price, good stability, high working efficiency, larger storage capacity than other equipment manufacturers, and rich features such as support for wireless connection and SD card module. For its configuration, the S7-200 SMART CPU consists of a central processing unit, a power supply, and input / output circuits. The S7-200 SMART CPU has a small and compact shell design but is a powerful micro PLC. Different CPU models will provide different characteristics and functions. The ST series has the characteristics of high performance and high reliability. Therefore, in this embodiment, CPU ST30 is selected to control each device in the system, and this control process is a common control method in the field and can be realized through existing technologies.

[0046] Specifically, in CPU ST30, S means that the CPU can expand modules to the right, T refers to transistor output, and 30 refers to the total number of inputs and outputs, including 18 DIs and 12 DOs. In S7-200 SMART, the Siemens PLC 485 interface generally has 3 as + and 8 as 485-, and the operation mode is half-duplex and supports USS and Modbus RTU protocols. The optional signal board consists of an interface and network status indicators. Among them, the interface is connected to a communication board starting with CB, which can usually be used as an additional communication path for CPU expansion, such as RS485 communication. The network status indicators transmit signals by guiding the light source of the circuit board through the light guide column to emit light. For the DI terminal block on CPU ST30, L+, M, and the ground symbol are connected to the 24V, 0V, and PE terminals respectively. If a component is damaged, the terminal block can be disassembled as a whole for easy replacement.

[0047] More specifically, as Figure 3 shown, it is the hardware wiring diagram of the S7-200 SMART PLC main module, including 18 input signals such as the open feedback of the No. 1 sewage discharge valve of the No. 1 clarifier (YH6501-1ZSO) and 14 output signals such as the command of the No. 1 sewage discharge valve of the No. 1 clarifier (YH6501-1O).

[0048] As shown in Table 1, it is the I / O list in the main module CPU ST30. The open and close feedbacks (I0.0 - I0.7, I1.0 - I0.7, I2.0 - I0.1) of the 3 sewage discharge valves of the No. 1 / 2 / 3 clarifiers corresponding to the interfaces are sent to the sewage discharge valve commands (Q0.0 - Q0.7, Q1.0 - Q1.3).

[0049] Table 1 I / O List in the Main Module CPU ST30

[0050]

[0051]

[0052] As shown in Table 2, in the expansion module, the I3.0 - I3.7 and I4.0 - I4.6 corresponding to EM DE16 send commands to the Q2.0 - Q2.7 and Q3.0 - 3.3 corresponding to EM DR08. According to the actual situation of on-site monitoring, a total of 14 AIs and 4 AOs need to be monitored and controlled for the control of the three clear water tanks.

[0053] Table 2 Interface List of EM DE16 in the Expansion Module

[0054]

[0055] Specifically, there are 14 analog input signals and 4 analog output signals in the chemical water pretreatment system, which are collected by selecting four analog expansion modules. The selected acquisition module is the S7-200 SMART PLC analog expansion module AM06. Part of the AM06 hardware wiring diagram is as Figure 4 . It includes two analog input signals, namely the water level of the No. 1 clear water tank and the water level of the No. 2 clear water tank, and the two-wire transmitter connection method is adopted. The connection methods of other analog signal acquisitions are the same as it. The input and output list of analog variables is shown in Table 3.

[0056] Table 3 Input and Output List of Analog Variables

[0057]

[0058] Specifically, the monitoring device is a monitoring computer, on which KingView software is set, and the configuration software is used for the system monitoring screen, trend screen, and alarm screen.

[0059] Compared with the prior art, the present embodiment provides a chemical water pretreatment monitoring system, including a PLC controller, a water inlet device, a raw water heating device, a clarification device, a water outlet device electrically connected to the PLC controller, and a monitoring device network-connected to the PLC controller. The water inlet device, the raw water heating device, the clarification device, and the water outlet device are sequentially connected through pipelines. Through this system, the pretreatment of chemical water can be realized to obtain water with impurities removed; and the process of the pretreatment process can be monitored and controlled, strictly controlled the pretreatment process, timely discover problems of improper treatment, improve the reliability of the pretreatment, and slow down the damage and aging of the thermal equipment.

[0060] Those skilled in the art can understand that the programs / software involved in the PLC controller in the above embodiments are common methods in the prior art, and the programs / software involved in the monitoring device are common methods in the prior art. For example, the methods in the existing Kingview can be run in the monitoring device. The present invention does not involve any improvement in software. The present invention only needs to connect the devices with corresponding functions through the connection relationships given in the embodiments of the present invention, and does not involve any improvement in program software. As for the connection methods between the hardware devices with corresponding functions, those skilled in the art can all implement them using the prior art and will not be described in detail here.

[0061] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention 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 invention should be covered by the protection scope of the present invention.

Claims

1. A chemical water pretreatment monitoring system, characterized in that It includes a PLC controller, a water inlet device, a raw water heating device, a clarification device, a water outlet device electrically connected to the PLC controller, and a monitoring device network-connected to the PLC controller; wherein, the water inlet device, the raw water heating device, the clarification device and the water outlet device are sequentially connected by pipelines; wherein, the clarification device includes 3 clarification tanks, clarification water tanks corresponding to each clarification tank one by one, and 5 clarification water pumps; the inlet pipelines of each clarification tank are connected after being connected as the inlet of the clarification device and are connected to the outlet pipeline of the raw water heating device, and the outlet of each clarification tank is connected to the inlet of the corresponding clarification water tank by a pipeline; the outlet pipelines of each clarification water tank are connected after being connected and are simultaneously connected to the inlet pipelines of each clarification water pump; the outlet pipelines of each clarification water pump are connected after being connected and are connected to the inlet pipeline of the water outlet device.

2. The chemical water pretreatment monitoring system according to claim 1, wherein The clarification device further includes a coagulant aid dosing unit; the coagulant aid dosing unit includes 2 coagulant aid tanks and 3 coagulant aid dosing pumps; the inlet of each coagulant aid tank is connected to the outlet pipeline of the water outlet device, and the medicine outlet pipelines of each coagulant aid tank are connected after being connected and are simultaneously connected to the medicine inlet pipelines of each coagulant aid dosing pump; the medicine outlet of each coagulant aid dosing pump is connected to the first medicine inlet of each clarification tank in a one-to-one correspondence and by a pipeline.

3. The chemical water pretreatment monitoring system according to claim 1, characterized in that The clarification device further includes a flocculant dosing unit; the flocculant dosing unit includes 2 flocculant tanks, 3 flocculant dosing pumps, 1 flocculant dosing auxiliary pump, 1 drug dissolving tank and 1 circulating pump; the circulating inlet of the circulating pump is connected to the medicine outlet of the drug dissolving tank, and the circulating outlet is connected to the medicine inlet of the drug dissolving tank; the water inlet of the drug dissolving tank is connected to the outlet pipeline of the water outlet device; the inlet of each flocculant tank is connected to the outlet pipeline of the water outlet device, and the medicine outlet pipelines of each flocculant tank are connected after being connected and are simultaneously connected to the medicine inlet pipelines of each flocculant dosing pump and the flocculant dosing auxiliary pump; the medicine outlet of each flocculant dosing pump is connected to the medicine outlet of the flocculant dosing auxiliary pump after being connected and is connected to the second medicine inlet of each clarification tank in a one-to-one correspondence and by a pipeline; the inlet of each flocculant tank is connected to the circulating outlet pipeline of the circulating water pump.

4. The chemical water pretreatment monitoring system according to claim 1, wherein The raw water heating device includes 2 steam inlet control valves, 2 raw water inlet control valves and 2 heat exchangers; the steam inlet of each steam inlet control valve is connected to the steam outlet of the steam generator, and the steam outlet is connected to the steam inlet of the heat exchanger in a one-to-one correspondence and by a pipeline; the water inlet of each heat exchanger is connected to the outlet pipeline of the water inlet device, and the outlet pipelines are connected after being connected as the outlet of the raw water heating device and are connected to the inlet pipeline of the clarification device.

5. The chemical water pretreatment monitoring system according to claim 4, wherein The raw water heating device further includes 2 degassers; each degasser is arranged at the outlet of each heat exchanger; the outlet of each heat exchanger passes through the degasser and then is connected by a pipeline as the outlet of the raw water heating device and is connected to the clarification device by a pipeline.

6. The chemical water pretreatment monitoring system according to claim 1, wherein The clarifier includes an inlet regulating valve, a mechanical stirrer, and three drain valves; the inlet regulating valve is arranged at the water inlet of the clarifier, the mechanical stirrer is arranged inside the clarifier, and each drain valve is arranged at the bottom of the clarifier.

7. The chemical water pretreatment monitoring system according to claim 2, wherein A coagulant aid mechanical stirrer is arranged inside the coagulant aid tank.

8. The chemical water pretreatment monitoring system according to claim 3, characterized in that, A coagulant mechanical stirrer is arranged inside the coagulant tank.

9. The chemical water pretreatment monitoring system according to claim 1, characterized in that, The PLC controller is connected to the monitoring device through TCP / IP Ethernet.

10. The chemical water pretreatment monitoring system according to claim 1, wherein The PLC controller is a Siemens S7-200 SMART PLC, where the main unit is CPU ST30 and the expansion module is EM DE16.

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