CN105843156B - An automatic water discharge device and method for water quality deterioration control at the end of a water supply pipe network based on multi-parameter monitoring - Google Patents

Abstract

The invention discloses an automatic water discharge device and method for controlling the deterioration of water quality at the end of a water supply pipe network based on multi-parameter monitoring. The device includes a monitoring system, a data transmission storage system and a control discharge system. The monitoring system is composed of turbidity online analyzer, DO electrode probe and ORP electrode probe. The data transmission and storage system is composed of GPRS wireless module, router and remote control computer. The control discharge system is composed of PLC main controller and the turbidity meter touch screen connected to it. , DO and ORP touch screen, No. 1 electric valve, No. 2 electric valve, ground wire, "local/remote" switch, electric valve switch. The invention is suitable for controlling the deterioration of water quality caused by the low water consumption and long interval between water use by users at the end of the urban water supply pipe network. The device starts the discharge before monitoring the water quality index in the pipeline exceeding the standard until the water quality reaches the preset standard, and obtains the water quality information accurately and quickly. It is an effective device to ensure the water quality safety at the end of the pipeline network.

Description

An automatic drainage system for water quality deterioration control at the end of water supply pipe network based on multi-parameter monitoring Water discharge device and method

technical field

The invention relates to an automatic water discharge device and a use method, in particular to an automatic water discharge device and a use method for controlling the deterioration of water quality at the end of a water supply pipe network based on multi-parameter monitoring.

Background technique

The water quality of the water source and the water quality of the municipal water supply network are still the links with many problems in the system of "from the source to the leader". The water quality problem of the water source can be solved to a certain extent through the source control and the water purification plant. After the factory water that reaches the national drinking water standard enters the pipeline network transmission and distribution system, there are still complex physical, chemical and microbial process changes and transformations in water quality, which in turn affect the water quality at the end. The chemical transformation of water quality mainly includes the following aspects: (1) Chemical reactions such as deposition, precipitation and crystallization occur, and the concentration of fine particulate matter (such as calcium carbonate) increases or deposits on the pipe wall. (2) Electrochemical corrosion occurs between the water body and the pipe wall, resulting in the release of corrosion products into the water body and the increase in the concentration of metal ions in the water. (3) Some components in the water body will form soluble complexes with the metal ions released from the tube wall corrosion tumor, which will greatly increase the concentration of heavy metals in the water body. For example, lead ions will form complexes with ammonia nitrogen. At the same time, because it is at the end, the residual chlorine concentration in the water body basically attenuates to zero, the microorganisms multiply again, and the microorganisms attach to the inner wall of the pipeline to form a biofilm. Under the condition of stagnation, some microorganisms in the biofilm will fall off into the water body to increase drinking water Aquatic life security risks. Certain microorganisms also affect corrosion. Studies have shown that the synergistic mechanism of electrochemical corrosion and microbial corrosion will accelerate the corrosion of the pipe wall and the deterioration of water quality, thereby greatly increasing the risk of water quality safety. The substandard water quality of the end pipe network is often manifested as excessive metal ions such as Fe and Mn and the total amount of bacteria exceeding the standard. At present, the above indicators are still difficult to achieve online monitoring or cannot be implemented due to the high construction and maintenance costs of online monitoring. Therefore, it is necessary to consider looking for some relevant indicators, which are not only convenient for online monitoring, but also have an inherently reliable model relationship with the above indicators. On this basis, according to the monitoring and judgment of related indicators, to achieve the standard control of the water quality of the end pipe network and ensure the safety of drinking water quality. The invention adopts real-time monitoring of changes in water quality-related indicators at the tip of the water supply pipe network, and takes timely drainage measures to prevent the occurrence of "yellow water" and "black water" problems, and avoid harm to end users' daily water use and water safety.

SUMMARY OF THE INVENTION

The purpose of the present invention is to overcome the deficiencies of the prior art, and to provide an automatic water discharge device for improving the water quality at the tip of the water supply pipe network. The device has simple process, convenient operation, high reliability, and can quickly and accurately obtain water quality parameter information. Ensure water safety for end users of the water supply network.

To achieve the above object, the present invention adopts the following technical solutions:

An automatic water discharge device for water quality deterioration control at the end of a water supply pipe network based on multi-parameter monitoring includes a monitoring system, a data transmission storage system and a control discharge system. The monitoring system is composed of a turbidity online analyzer, a DO electrode probe and an ORP electrode probe. The turbidity online analyzer, DO electrode probe and ORP electrode probe are installed in the water supply pipeline at the end of the pipe network, and are connected to the PLC main controller through the signal line; the data transmission and storage system is composed of GPRS wireless module, router, and remote control computer. , the GPRS wireless module is connected to the PLC main controller, the router is connected to the GPRS wireless module, the remote control computer receives the data information sent by the router and stores it; the control discharge system is controlled by the PLC main controller and the turbidity meter touch screen, DO and ORP connected to it. Touch screen, No. 1 electric valve, No. 2 electric valve, ground wire, "local/remote" switch, electric valve switch. The PLC main controller controls the No. 1 electric valve and the 2 The opening and closing of the electric valve.

The turbidity online analyzer, DO electrode probe and ORP electrode probe are directly installed on the water supply pipeline. The DO electrode probe and ORP electrode probe are installed with necessary protective sleeves, and the length of the protective sleeve is greater than the length of the electrode probe to avoid water flow. Direct impact on the electrode probe when flowing.

Said PLC main controller adopts SIEMENS S7-300 series.

A gate valve is installed on the water supply pipeline, and the valve can be closed to facilitate the maintenance of the relevant operating equipment.

The GPRS wireless module can transmit the data in the PLC main controller to the remote control computer.

The GPRS wireless module adopts 4G communication mode to ensure real-time and stable data transmission.

The length of the signal line of the turbidity online analyzer, DO electrode probe and ORP electrode probe is all less than 3 meters, which reduces the deviation from the actual value caused by the attenuation of the signal during the transmission process.

The use method of the automatic water discharge device for controlling the water quality deterioration at the end of the water supply pipe network based on multi-parameter monitoring includes the following steps:

The device starts to run: first switch the working status of the PLC main controller from "local" to "remote", and set the upper limit of the iron and manganese concentration and the total number of culturable bacteria on the remote control computer, as well as the discharge time and standing time of water. When the turbidity online analyzer, DO electrode probe and ORP electrode probe monitor a certain water quality parameter index in the water supply pipeline after being converted by the PLC main controller, it reaches the upper limit of the iron and manganese concentration and the total number of cultivable bacteria set on the remote control computer. For a limited time, the No. 2 electric valve controlled by the PLC main controller through the signal line is opened, and the No. 1 electric valve is closed. When the opening time of the No. 2 electric valve reaches the set discharge time, it will be closed, and the No. 1 electric valve will be opened at the same time. After time, when the water quality parameters monitored by the turbidity online analyzer, DO electrode probe and ORP electrode probe are still at the upper limit set by the remote control computer after being converted by the PLC main controller, the No. 2 electric valve is opened again, and the No. 1 electric valve is opened again. The valve is closed until the water quality parameters monitored in the pipeline meet preset standards.

The remote control computer in the use method steps can set the water discharge time and standing time, and can set the upper limit of the iron and manganese concentration and the total number of culturable bacteria respectively in different temperature ranges.

The DO electrode probe in the steps of the use method can monitor the water temperature while monitoring the dissolved oxygen in the water body, and feed the result back to the PLC main controller, and the PLC main controller automatically calls the iron and manganese within the corresponding temperature range according to the monitored water temperature. The upper limit of the concentration and the total number of culturable bacteria.

The present invention adopts the above technical scheme and has the following advantages: (1) the device can monitor the changes of water quality at the tip of the pipe network in real time and stably online, and can provide data reference for studying the law of relevant water quality changes; (2) the device can monitor the water quality parameters according to the monitored water quality parameters. It is worth scientific drainage to save water resources to the greatest extent; (3) The device can accurately and quickly obtain water quality information, and automatically discharge the deteriorated water at the end of the pipe network in a timely manner, so as to avoid affecting the daily water consumption of end users.

Description of drawings

Fig. 1 is the process flow diagram of the control device of automatic discharge water;

Fig. 2 is the schematic diagram of probe electrode installation of the present invention;

3 is a detailed view of the probe electrode installation of the present invention;

In the picture: router 1, GPRS wireless module 2, PLC main control box 3, turbidimeter touch screen 4, DO and ORP touch screen 5, turbidity online analyzer 6, signal line 7, DO electrode probe 8, ORP electrode probe 9, No. 2 electric valve 10, No. 1 electric valve 11, "local/remote" manual switch 12, electric valve switch 13, remote control computer 14, gate valve 15, electrode probe protective cover 16, ground wire 17.

Detailed ways

The present invention will be described in detail below with reference to the accompanying drawings and embodiments.

As shown in FIG. 1 , the present invention is an automatic water discharge device for water quality deterioration control at the end of a water supply pipe network based on multi-parameter monitoring, including a monitoring system, a data transmission and storage system, and a control discharge system. The monitoring system is composed of turbidity online analyzer 6, DO electrode probe 8 and ORP electrode probe 9. Turbidity online analyzer 6, DO electrode probe 8 and ORP electrode probe 9 are installed in the water supply pipeline at the end of the pipe network, and pass the signal Line 7 is connected to the PLC main controller 3; the data transmission and storage system is composed of a GPRS wireless module 2, a router 1, and a remote control computer 14. The GPRS wireless module 2 is connected to the PLC main controller 3, and the router 1 is connected to the GPRS wireless module 2. , the remote control computer 14 receives the data information sent by the router 1 and stores it; the control discharge system is controlled by the PLC main controller 3 and the turbidimeter touch screen 4, DO and ORP touch screen 5, No. 1 electric valve 11, and No. 2 electric valve connected to it. 10. The "local/remote" switch 12 and the electric valve switch 13 are constituted. The PLC main controller 3 controls the opening of the No. 1 electric valve 11 and the No. 2 electric valve 10 by receiving the valve opening and closing instructions issued by the operating software of the remote control computer 14. with off.

As shown in Figures 2 and 3, the turbidity online analyzer 6, the DO electrode probe 8 and the ORP electrode probe 9 are directly installed on the water supply pipeline, and the DO electrode probe 8 and the ORP electrode probe 9 are installed with the necessary protective cover 16, and the protection The length of the sleeve 16 is greater than the length of the electrode probe, so as to avoid direct impact on the electrode probe when the water flows.

PLC main controller 3 adopts SIEMENS S7-300 series with superior performance.

A gate valve 15 is installed on the water supply pipeline, and the valve can be closed to facilitate the maintenance of related operating equipment.

The PLC main controller 3 is suspended and connected to the ground wire 16 to avoid hazards to people and equipment due to accidents such as electric leakage.

Both the No. 1 electric valve 11 and the No. 2 electric valve 10 can receive analog signals and can be controlled by the PLC main controller 3 .

The GPRS wireless module 2 can transmit the data in the PLC main controller 3 to the remote control computer 14 .

GPRS wireless module 2 adopts 4G communication mode to ensure real-time and stable data transmission.

The length of the signal line 7 of the turbidity online analyzer 6, the DO electrode probe 8 and the ORP electrode probe 9 is all less than 3 meters, which reduces the signal attenuation during the transmission process and causes a large deviation from the actual value.

The water quality deterioration control at the end of the water supply pipe network that the automatic water discharge device of the present invention is used for monitoring can be carried out according to the steps of the following embodiments:

Example 1

a) Collect the water samples at the end of the water supply network in a certain area in the four seasons of spring, summer, autumn and winter respectively, and collect an average of 9 times in each season, and the length of each collection is 24 hours. Water quality parameters were detected separately: dissolved oxygen, redox potential, turbidity, iron and manganese concentration, total number of culturable bacteria.

b) According to different temperature ranges: 0-15°C, 15-25°C, and 25-35°C, respectively, establish the relationship between redox potential, dissolved oxygen, turbidity, iron and manganese concentration, and total number of culturable bacteria. Relational model, edit the relational model formula and input it into the control program of PLC main controller 3, so as to control the changes of iron, manganese concentration and the total number of culturable bacteria in the water body through the monitoring of redox potential, dissolved oxygen and turbidity

c) The device starts running: the working state of the PLC main controller 3 is switched from "local" to "remote", and the remote control computer 14 is set on the numerical upper limit of the concentration of iron and manganese and the total number of cultivable bacteria, as well as the discharge time of water and the static Time, when the turbidity online analyzer 6, DO electrode probe 8 and ORP electrode probe 9 monitor any water quality index in the water supply pipeline, after the numerical conversion of the relationship model of the PLC main controller 3, it reaches the iron and manganese set on the remote control computer 14. When the upper limit of the concentration and the total number of cultivable bacteria is reached, the No. 2 electric valve 10 controlled by the PLC main controller 3 through the signal line 7 is opened, and the No. 1 electric valve 11 is closed. When the opening time of the No. 2 electric valve 10 reaches the set discharge time That is, it is closed, and the No. 1 electric valve 11 is opened at the same time. After standing for a period of time, when the water quality parameters monitored by the turbidity online analyzer 6, DO electrode probe 8 and ORP electrode probe 9 are converted by the PLC main controller, it is still in remote control. When the upper limit set by the computer 14 is reached, the No. 2 electric valve 10 is opened again, and the No. 1 electric valve 11 is closed until the water quality parameters monitored in the pipeline meet the preset standards.

Example 2

In the PLC main controller 3, an empirical model, an empirical relational expression or an existing relational model between the redox potential, dissolved oxygen, turbidity and iron and manganese concentration, and the total number of culturable bacteria are directly input.

The device starts to run: the working state of the PLC main controller 3 is switched from "local" to "remote", and the remote control computer 14 is set on the numerical upper limit of Fe, Mn concentrations and the total number of cultivable bacteria, as well as the discharge time and standing time of water , when the turbidity online analyzer 6, the DO electrode probe 8 and the ORP electrode probe 9 monitor any water quality index in the water supply pipeline, after the relational expression or model in the PLC main controller 3 is converted, it reaches the value set on the remote control computer 14. When the upper limit of the iron and manganese concentration and the total number of cultivable bacteria is reached, the No. 2 electric valve 10 controlled by the PLC main controller 3 through the signal line 7 is opened, and the No. 1 electric valve 11 is closed. When the opening time of the No. 2 electric valve 10 reaches the set value After the discharge time, it will be closed, and the No. 1 electric valve 11 will be opened at the same time. After standing for a period of time, when the water quality parameters monitored by the turbidity online analyzer 6, DO electrode probe 8 and ORP electrode probe 9 are converted by the PLC main controller. When it is at the upper limit set by the remote control computer 14, the No. 2 electric valve 10 is opened again, and the No. 1 electric valve 11 is closed until the water quality parameters monitored in the pipeline meet the preset standards.

On the basis of the technical solution of the present invention, any improvement and equivalent transformation of the individual equipment of the device according to the principle of the present invention are not excluded from the protection scope of the present invention.

Claims (3)

1. a kind of automatic-discharging water installations of the water supply network end water quality deterioration control based on multi-parameter monitoring, feature exist In: including monitoring system, data transmission storage system and control exhaust system, system is monitored by turbidity on-line analyzer (6), DO Electrode probe (8) and ORP electrode probe (9) are constituted, turbidity on-line analyzer (6), DO electrode probe (8) and ORP electrode probe (9) it is mounted in the water supply line of pipe network tip, and is connected on PLC main controller (3) by signal wire (7)；Data transmission is deposited Storage system is made of GPRS wireless module (2), router (1), remotely controlling computer (14), and GPRS wireless module (2) is connected to PLC main controller (3), router (1) are connect with GPRS wireless module (2), and remotely controlling computer (14) receiving router (1) issues Data information and storage；Control exhaust system by PLC main controller (3) and coupled transmissometer touch screen (4), DO and ORP touch screen (5), No. 1 electrically operated valve (11), No. 2 electrically operated valves (10), ground line (17), " on the spot/long-range " switch (12), Electrically operated valve switchs (13) and constitutes, the controlled valve instruction that PLC main controller (3) is issued by reception remotely controlling computer (14), Control the open and close of No. 1 electrically operated valve (11) and No. 2 electrically operated valves (10)；

The drain time and time of repose and can be within the scope of different temperature of water can be set in the remotely controlling computer The upper limit of ferrimanganic concentration and cultivable bacteria sum is respectively set；The turbidity on-line analyzer (6), DO electrode probe (8) Be directly installed on water supply line with ORP electrode probe (9), DO electrode probe (8) and ORP electrode probe (9) installation it is necessary to Protective case (16), and the length of protective case (16) be greater than electrode probe length, avoid water flow when flowing to electrode probe produce It is raw directly to impact；Signal wire (7) length of the turbidity on-line analyzer (6), DO electrode probe (8) and ORP electrode probe (9) Degree is respectively less than 3 meters, reduces the decaying because of signal in transmit process due to causes to be deviated with actual value.

2. a kind of automatic-discharging of the water supply network end water quality deterioration control based on multi-parameter monitoring as described in claim 1 The application method of water installations, comprising the following steps:

Device brings into operation: the working condition of first PLC main controller (3) is electric by switching to " long-range " " on the spot ", then in long-range control The numerical upper limits of ferrimanganic concentration and cultivable bacteria sum and the drain time and time of repose of water are set on brain (14), when turbid Degree in-line analyzer (6), DO electrode probe (8) and ORP electrode probe (9) monitor that a certain water quality parameter in water supply line refers to Mark reaches the ferrimanganic concentration being arranged on remotely controlling computer (14) after PLC main controller (3) conversion and cultivable bacteria sum refers to When the target upper limit, PLC main controller (3) is opened by No. 2 electrically operated valves (10) that signal wire (7) control, No. 1 electrically operated valve (11) It closes, is closed immediately after No. 2 electrically operated valve (10) opening times reaching set drain time, while No. 1 electrically operated valve (11) it opens, after standing a period of time, when turbidity on-line analyzer (6), DO electrode probe (8) and ORP electrode probe (9) monitor The water quality parameter arrived through PLC main controller conversion after still in the setting of remotely controlling computer (14) the upper limit when, No. 2 electrically operated valves (10) it is again turned on, No. 1 electrically operated valve (11) is closed, until the water quality parameter monitored in pipeline meets preset standard value；

The drain time and time of repose and can be within the scope of different temperature of water can be set in the remotely controlling computer The upper limit of ferrimanganic concentration and cultivable bacteria sum is respectively set.

3. according to the method described in claim 2, it is characterized by: the DO electrode probe (8) is in monitoring Dissolved Oxygen in Water While can also monitor water temperature, and result is fed back to PLC main controller (3), PLC main controller (3) according to the water temperature monitored from The upper limit of dynamic the ferrimanganic concentration called within the scope of corresponding temperature and cultivable bacteria sum.