CN102230577A - Comprehensive water quality simulation test system for quasi-closed circulation pipe network - Google Patents

Abstract

The invention discloses a quasi-closed circulation pipe network water quality comprehensive simulation test system, which includes a water supply subsystem and an independent circulation pipe network subsystem. The water supply subsystem includes a water supply tank with a water inlet, a water outlet and a drug injection port; The network sub-system is a circuit including the main circulation pump connected in series through the pipeline, the electromagnetic flowmeter and the high-level replenishment and exhaust water tank; the circuit is connected with a water replenishment system for replenishing water for the circuit, a venting branch for discharging water in the circuit and water quality monitoring system. The pipeline of the independent circulation pipe network subsystem is also connected with a medicament filling system. The quasi-closed circulation pipe network water quality comprehensive simulation test system utilizes the mutual cooperation of various components, and has the advantages of high simulation degree and closer to the actual municipal water supply pipe network system.

Description

A quasi-closed circulation pipe network water quality comprehensive simulation test system

technical field

The invention relates to the technical field of a test simulation system for a drinking water supply pipe network, in particular to a quasi-closed circulation pipe network water quality comprehensive simulation test system.

Background technique

The water supply pipe network is an important part of the urban water supply system. Its function is to deliver water that meets the national drinking water quality standards after being purified by the water plant to the user terminal. The water quality indicators of most waterworks in my country can meet or exceed the national drinking water quality standards, but when it is delivered to users through the pipe network, it often fails to meet the standards and even endangers the health of users. According to the data, the water quality of the water plant shows a trend of decreasing obviously from the factory to the user, mainly manifested in the increase of the content of iron, manganese, chroma, turbidity, total number of bacteria, etc. in the water, even exceeding the national standard. It has been found in the actual operation of the water plant. In addition, although the rapid development of water treatment technology has fully guaranteed the safety and sanitation of the treated water quality, the secondary pollution problem in the pipe network has become the main factor affecting the failure of the effluent water quality to meet the standard. the key of.

The water supply network is like a sensitive, dynamic and huge reactor with its own characteristics. Due to the long residence time in the pipeline, the water itself is constantly re-polluted, and complex physical, chemical and biological changes occur in the pipeline. , leading to a decline in the sanitary conditions in the pipeline. According to the statistics of the water quality data of 34 major domestic cities in the "2000 Technological Progress and Development Plan of Urban Water Supply Industry", 21% of the water produced by surface water plants is basically stable, 50% are corrosive, and 50% are slightly scaled. 29%. 50% of the factory water is basically stable, 30% is corrosive, and 20% is slightly corrosive. According to the survey of 36 cities accounting for 42.44% of the total water supply in the country, the average turbidity of the factory water was 1.3 degrees, while the pipe network water increased to 1.6 degrees; the chromaticity increased from 5.2 degrees to 6.7 degrees; the iron increased from 0.09mg/l to 0.11mg/l; the total number of bacteria increased from 6.6cfu/ml to 29.2cfu/ml. In a certain city, it was found that the scale in the water supply pipe was 16-20mm thick, red, smelly, containing 16 kinds of metal elements, and 6 kinds of microorganisms including iron bacteria and Escherichia coli were detected (see Qin Qiuli, Chen Jingyan, Chinese Urban Analysis of water supply safety status and research on safeguard countermeasures, Water Economics, 2001.5). According to the statistics of the roughness coefficient of the pipe network regularly measured in Shanghai, Tianjin and other cities, it is found that the water delivery capacity of the pipeline without anti-corrosion measures has been reduced by more than 1/3. Scaling of pipelines, deterioration of water quality, and decline in pipeline water delivery capacity have become common phenomena in urban water supply networks.

With the expansion of my country's urban built-up areas and the rapid advancement of urban-rural integrated water supply, social progress and improvement of people's living standards, residents' requirements for drinking water are no longer limited to the protection of pressure and water quantity, but more attention Water quality problems, water quality stability and safety issues of urban water supply pipe network are becoming more and more urgent. The quality of drinking water must not only meet the standard when it leaves the factory, but also need to meet the standard at the tap of the user to meet the drinking water quality standard. As the most important and sensitive link in drinking water delivery, the sanitation of the water supply pipe network is the premise and basis for ensuring the safety of the water quality of the final tap water. Studying the mechanism of water quality changes in the pipe network, and proposing and verifying relevant countermeasures are the key to ensuring the sanitation inside the pipe network and ensuring the safety of the water quality at the end of the pipe network.

To carry out the above research work, pipe network experimental research is the basic means, which can be realized through three levels of experimental means. The most direct way is to carry out field tests, but there are problems such as uncontrollable external conditions, and it is difficult to carry out targeted quantitative research. What is more critical is that the test pipe network involves thousands of households, and it is not easy to add test chemicals; the simplest It is an indoor beaker test or a simple local reactor test, but this kind of test has few water samples and cannot be used for long-term cycle tests. Compared with the actual working conditions of the actual pipeline, there are serious test distortion problems. Therefore, many research institutions at home and abroad tend to use the test device of the circulating pipe network model to conduct high-simulation simulation of the real pipe network and provide panoramic display and analysis. In the existing technology, the water quality simulation test system of the circulating pipe network at home and abroad all adopts an open circulation method, that is, a low-level reservoir is connected to the circulating pipe loop, and the water flows into the reservoir after passing through the pipeline, and then passes through the lift pump. Lift water up the pipe system for circulation. The storage tank is not only the test raw water deployment tank but also has the function of exhausting. However, because the circulating water samples are in contact with the air in a large area every time they flow through the storage tank, the quality of the circulating water will be affected; and the raw water tank participates in the pipe network circulation test. , there is a certain difference between the water flow conditions and the actual pipe network, resulting in a large deviation between the simulation effect and the real pipe network. Moreover, the pipeline circulation design of the entire circulation pipe network test system is very simple, and the circulation distance is short, so there are technical defects such as simulation distortion, few controllable parameters, narrow water quality research scope, and difficulty in studying working conditions and internal habitats. In essence, it is a comprehensive simulation test system for circulating pipe network water quality.

Contents of the invention

The invention provides a quasi-closed circulation pipe network water quality comprehensive simulation test system, in the whole quasi-closed circulation pipe network water quality comprehensive simulation test system, each component cooperates with each other, the simulation degree is high, and the actual water supply main pipe network system can be simulated .

A quasi-closed circulation pipe network water quality comprehensive simulation test system, including a water supply subsystem and an independent circulation pipe network subsystem connected to the water supply subsystem;

The water supply subsystem includes a water supply tank with a water inlet, a water outlet and a medicament injection port;

The independent circulation pipe network subsystem is a circuit comprising a main circulation pump connected in series through pipelines, an electromagnetic flowmeter and a high-level replenishment and exhaust water tank; the circuit is provided with a water inlet, and the water inlet of the circuit is connected to the water supply tank The water outlet is connected through a pipeline with a first valve;

The circuit is connected with a water supply system for replenishing water in the circuit, a venting branch for discharging water in the circuit, and a water quality monitoring system for monitoring the water quality of the water in the circuit;

The water replenishment system includes a series-connected experimental water filling tank and an experimental water filling pump, the outlet of the experimental water filling pump is connected to the circuit, the inlet of the experimental water filling tank is connected to the water outlet of the water supply tank connected;

The top surfaces of the water supply tank and the high-level supplementary exhaust water tank are close to the same horizontal plane, and the horizontal plane is located at the highest horizontal position of the quasi-closed circulation pipe network water quality comprehensive simulation test system, and the placement of the main circulation pump The location is lower than that of the water supply tank and the high-level replenishment and exhaust tank;

The high-level replenishment and exhaust water tank includes a box body and a piston-shaped floating cover located in the box, and there is a gap between the piston-shaped floating cover and the inner wall of the box; the density of the piston-shaped floating cover is less than that of water. density.

The water supply tank is a water source for the quasi-closed circulation pipe network water quality comprehensive simulation test system. The water outlet of the water supply tank is generally located at the bottom of the water supply tank, that is, the bottom surface of the water supply tank or the side of the water supply tank close to the bottom surface of the water supply tank. In this way, the water in the water supply tank can better flow into the independent circulation pipe network subsystem, and better supply water for the independent circulation pipe network subsystem. The water source of the water supply tank generally uses tap water to supply water directly through the water inlet of the water supply tank or directly pours the water into the water supply tank through the water inlet of the water supply tank after being transported by a water storage vehicle. It needs to be deployed to get the required water supply source.

In order to keep the water in the water supply tank free from pollution and to discharge the gas in the water supply tank smoothly, the top of the water supply tank is covered with a water supply tank dust cover with an area slightly larger than the top surface of the water supply tank; The top of the side wall is provided with a through hole for exhaust.

The water supply tank is connected with a pipeline branch with a mixing circulation pump, and the two ends of the pipeline branch are respectively communicated with the water supply tank; there is preferably a height difference between the two ends of the pipeline branch, such as pipeline One end of the branch is set on the bottom of the water supply tank or the side wall of the water supply tank close to the bottom of the water supply tank, and the other end of the branch is set on the top of the water tank or the side wall of the water supply tank close to the top of the water tank. In this way, there is a certain height difference between the two ends of the pipeline branch of the water supply water tank. Go in from the other end of the pipeline branch (ie the high end of the pipeline branch), so that the water in the water supply tank is fully stirred, and finally mixed evenly.

The main circulation pump provides power for the water circulation in the pipes of the independent circulation pipe network subsystem, so that the water in the pipes of the independent circulation pipe network subsystem can have a stable flow rate. Preferably, the bottom surface of the main circulation pump is located at the quasi The lowest level of the water quality comprehensive simulation test system of the closed circulation pipe network, so that when the pipes of the independent circulation pipe network subsystem are filled with test water from the water supply tank, the inner cavity of the main circulation pump can also be filled with water, and the main circulation pump is started for independent circulation The water in the pipes of the pipe network subsystem provides power. The control of the flow rate is completed by the frequency conversion control of the main circulation pump, and the measurement of the flow rate can be carried out by an electromagnetic flowmeter.

In the described water replenishment system, the experimental water filling tank and the experimental water filling pump connected in series can be used. At the same time, an electromagnetic flowmeter can also be set to feed back the amount of water replenishment. The liquid level of the test raw water in the high-level exhaust water replenishment water tank of the pipe network subsystem is higher than that of the water supply water tank, so that most of the test raw water in the water supply water tank can enter the independent circulation pipe network subsystem to save raw water loss. When the water quality monitoring system reduces the water in the pipes of the independent circulation pipe network subsystem due to the need for monitoring and sampling, in view of the fact that the reduction in the sampled water is very small, it can When the water replenishment is completed, when the pipe water replenishment volume of the circulating pipe network subsystem is relatively large, that is, when the pipes of the circulating pipe network subsystem need to be supplemented with a large amount of water after exhaust or the water level of the high-level exhaust replenishment water tank is relatively low, you can The water replenishment system is used to replenish water, so that there is always water stored in the high-level exhaust water replenishment water tank, and the water level is kept at an appropriate level to prevent air from entering the pipes of the circulation pipe network subsystem.

The venting branch is composed of a venting valve and a system venting pipe, which discharges all the circulating pipe network water after the simulation test is completed, and then refills the water through the water supply tank to start a new test.

Although domestic and foreign pipeline network simulation systems are equipped with water tanks to remove the air in the pipeline, avoid vacuum in the circulation loop and cause instability and vibration. However, the existing water tank is an open box, and the water tank with this structure will inevitably make the water sample have the opportunity to contact with the air during the circulation process, which will cause the change of the water quality in each cycle, and lead to the simulation of the pipe network simulation. The decrease in degree leads to a large deviation in the research results. For this reason, in the quasi-closed circulation pipe network water quality comprehensive simulation test system of the present invention, the high-level replenishment and exhaust water tank in the independent circulation pipe network subsystem is provided with a piston-shaped floating cover with the same shape as the bottom surface, and the piston-shaped floating cover Place it horizontally in the high-level water replenishment and exhaust water tank, and leave a gap with the inner wall of the high-level water replenishment and exhaust water tank. The density of the piston-shaped floating cover is less than that of water, so that the piston-shaped floating cover can replenish water and exhaust air at a high position. The water level in the water tank rises or falls to make a piston movement, which ensures that the gas in the pipeline is emptied while minimizing the chance of the circulating water flow in contact with the air outside the pipeline, ensuring that the water quality of the simulated pipeline is consistent with the real pipeline network. The requirement for density is mainly to make the piston-shaped floating cover float up. The density mentioned refers to the overall density of the piston-shaped floating cover, not the density of the material of the piston-shaped floating cover. For example, the piston-shaped floating cover can be made of thin stainless steel. A closed piston-type floating cover made of a board and filled with air in the middle, such a piston-type floating cover can also float on water, meeting the density requirements of the present invention for the piston-shaped floating cover.

The high-level replenishment and exhaust water tank has a wall surface perpendicular to the bottom surface, and is a three-dimensional shape and area of any cross-section. It is more convenient that the piston-shaped floating cover whose shape is similar to the cross-section and whose area is slightly smaller than the cross-section can perform piston movement in the vertical direction. The top surface dustproof cover of the high-level replenishment and exhaust water tank on the top surface of the water tank. The top surface dust-proof cover of the high-level replenishment and exhaust water tank can be effectively supported by the high-level replenishment and exhaust water tank body. The top of the side wall of the high-level replenishment and exhaust water tank is provided with a through hole for exhaust, so that the chance of the water sample contacting the air during the circulation process can be greatly reduced, and the air in the independent circulation pipe network subsystem can be separated. The air in the circulating water is discharged smoothly. Preferably, the casing of the high-level replenishment and exhaust water tank can be selected to be cylindrical.

In order to better remove air bubbles in the water in the pipes of the independent circulation pipe network subsystem, the water outlet of the high-level replenishment and exhaust water tank is located at the bottom of the high-level replenishment and exhaust water tank, that is, it is located close to the bottom surface of the high-level replenishment and exhaust water tank The side wall of the high-level replenishment and exhaust water tank or the bottom surface of the high-level replenishment and exhaust water tank, the water inlet of the high-level replenishment and exhaust water tank is higher than the water outlet of the high-level replenishment and exhaust water tank and lower than half of the height of the high-level replenishment and exhaust water tank a location. In this way, the water inlet of the high-level water supply and exhaust water tank is higher than the water outlet of the high-level water supply and exhaust water tank. Rising, easy to discharge.

The independent circulation pipe network subsystem is multiple and the pipes of the multiple independent circulation pipe network subsystems are the same or different; the pipes of the independent circulation pipe network subsystem are ductile iron pipes, polyethylene pipes (PE pipes) , copper or stainless steel tubes. The pipes of the independent circulation pipe network subsystem are the carrier of water flow in the circulation pipe network and also the transportation environment. Since the degree of secondary pollution of water by pipes of different materials is different, the specific chemical, physical and biological changes will also vary. Different, therefore, the present invention has selected ductile iron pipes, PE pipes, copper pipes, stainless steel pipes, etc. commonly used in actual pipelines as the pipelines of the independent circulation pipe network subsystem, to study the effects of different pipelines on the water quality changes in the transportation pipe network. impact, put forward relevant technical countermeasures, and verify the effectiveness of relevant technical countermeasures.

The water supply subsystem in the present invention can be connected with a plurality of independent circulation pipe network subsystems, and a plurality of independent circulation pipe network subsystems can be tested independently, such as a water supply subsystem is connected with four independent circulation pipe network subsystems, that is A water supply subsystem is connected to the independent circulation pipe network subsystem, the independent circulation pipe network subsystem is the ductile iron pipe, the independent circulation pipe network subsystem is the PE pipe independent circulation pipe network subsystem, the independent circulation pipe network subsystem The independent circulation pipe network subsystem whose pipes are stainless steel pipes and the independent circulation pipe network subsystem whose pipes are copper pipes.

In order to monitor the water quality in the pipes of the independent circulation pipe network subsystem, the pipes of the independent circulation pipe network subsystem are connected with a water quality monitoring system for monitoring the water quality of the water in the loop, and the pipes of the independent circulation pipe network subsystem are sampled for water quality The amount of monitored water is very small, almost negligible. Generally, water replenishment can be completed by storing water in the high-level exhaust water replenishment water tank (in special test cases, the demand for water replenishment in the pipes of the independent circulation pipe network subsystem exceeds the high-level drain. The maximum amount of replenishment water that can be provided in the air replenishment water tank can also be replenished in time through the replenishment system). Therefore, under normal circumstances, water samples can be directly discharged into the trench after passing through the water quality monitoring system. But in order to minimize the impact of the water quantity of collecting water samples on the water in the pipeline of the independent circulation pipe network subsystem: the described water quality monitoring system is made up of the water quality monitoring circulation pipeline branch and the water quality monitoring non-circulation pipeline branch; The branch circuit of the monitoring circulation pipeline includes a conductivity meter, a pH meter and a dissolved oxygen tester connected in parallel. Since conductivity monitoring, water pH monitoring and dissolved oxygen monitoring do not involve chemical changes, they can be monitored. Therefore, the water quality of the above-mentioned monitored water samples is basically the same as that of the water in the pipes of the independent circulation pipe network subsystem. After monitoring The water samples can be returned to the pipeline of the independent circulation pipe network subsystem through the water quality monitoring loop again. Based on the above reasons, real-time monitoring can be used for conductivity monitoring, water pH monitoring and dissolved oxygen monitoring, that is, monitoring can be carried out at any time. It will not cause destabilization of the water flow in the pipelines of the monitoring independent circulation pipe network subsystem, wherein, the above-mentioned conductivity monitoring, water pH monitoring and dissolved oxygen monitoring can all use commercially available instruments and equipment.

The non-recyclable pipeline branch for water quality monitoring includes a parallel residual chlorine detector, turbidity detector and particle content detector, and one end of the non-circulatory pipeline branch for water quality monitoring is connected to the pipeline of the independent circulation pipe network subsystem , and the other end is connected to the trench. Because residual chlorine monitoring, turbidity monitoring and particle content monitoring need to add reagents, the water quality of the test water in the circulating pipeline is changed, or the water is diverted out for testing and loses pressure, and it is no longer possible to return to the pipeline of the independent circulation pipe network subsystem through the pressure difference. Therefore, it can only be discharged into the ditch, and the residual chlorine monitoring, turbidity monitoring and particle content monitoring can all be monitored by commercially available instruments. In order to reduce the loss of water samples, the tests of these three indicators adopt the method of intermittent and regular monitoring. It can be turned on and off manually, or it can be turned on automatically according to the set initial time and interval time, and it will be turned off automatically after the time required for test stability is reached and the reading signal is transmitted and displayed.

In order to simulate various working conditions such as secondary disinfection of the actual water supply network (such as chloramine, chlorine dioxide, ozone, sodium hypochlorite, etc.), invasion of exogenous pollutants, and sudden changes in water quality, and to study the law of water quality changes, the independent cycle The pipeline of the pipe network subsystem is connected with a medicament filling system, and the medicament filling system includes a medicament filling tank and a medicament filling pump connected in series. The medicine can be selectively added through the medicine filling system. Among them, the medicine filling pump is a precision metering filling pump, and the precision metering filling pump can add the set amount of medicine according to the set running time, so as to achieve precise control The timing and dosage of the drug. The number of the medicament filling systems can be increased or decreased as required. When performing simulation tests in the quasi-closed circulation pipe network water quality comprehensive simulation test system, it is sometimes necessary to select agents to add according to the water quality results monitored by the water quality monitoring system. Preferably, the number of agent filling systems is 1 to 5. It is also possible to monitor the water quality results after adding chemicals according to the water quality monitoring system, such as the monitoring of disinfection by-products after disinfection. In addition, the tracer can also be added through the drug filling system, and the amount of the added tracer can be accurately controlled through the drug filling pump to ensure that the conditions of each test are consistent. , to ensure that the pipeline is flushed clean, so that it will not interfere with the test results and ensure the accuracy of the test results.

The pipeline of the independent circulation pipe network subsystem is provided with an outlet for manual water sampling, and a second valve is provided at the outlet position. When the water sample is not taken, the second valve is closed. When the water sample needs to be taken, By opening the second valve, water samples can be directly taken from the outlet, and the water quality indicators of the sampled water can be analyzed by means of chemical reaction or instrumental analysis.

The present invention has the following advantages:

The water supply water tank of the present invention can provide tap water of various water qualities for the quasi-closed circulation pipe network water quality comprehensive simulation test system, so as to meet the research requirements of the quasi-closed circulation pipe network water quality comprehensive simulation test system for different water quality and water sources, and to cope with the different water quality in different places at present. The different water quality changes and different secondary pollution problems of the factory tap water in the pipeline network transportation of the water quality can simulate the problems of the factory water in the pipeline network transportation at a higher level.

The high-level replenishment and exhaust water tank of the present invention can well drain the air bubbles in the circulation pipe network, and can quickly replenish the water lost in the test with the water stored in the high-level replenishment and exhaust water tank that actually participates in the circulation. When the liquid level in the tank is low, water can be replenished through the water replenishment system, so that the comprehensive simulation test of the water quality of the circulating pipe network is closer to the reality and the water flow in the circulating pipe network is stable, thus ensuring the accuracy of the test results.

The water quality monitoring system and electromagnetic flowmeter of the present invention can well realize residual chlorine monitoring, turbidity monitoring, particle content monitoring, residual chlorine monitoring, turbidity monitoring, particle content monitoring and flow monitoring, and ensure the parameters of water quality in the circulation pipe network and operating status monitoring, so as to have a comprehensive grasp of the working conditions in the circulating pipe network, which is more conducive to the study of physical changes, chemical changes and biological changes, such as residual chlorine decay law and kinetic analysis, pipe network internal The model and biochemical mechanism analysis of the formation and migration of disinfection by-products, the biological and chemical stability of the water supply network, the electrochemical mechanism of pipe scale, and the microbial habitat in the pipe provide a high-simulation simulation hardware platform for the water supply network. The prevention and control of secondary pollution provides basic theoretical data.

The medicament filling system of the present invention can precisely control the filling time and filling dose, and can simulate working conditions such as secondary and tertiary chlorine addition, foreign pollutant invasion, water quality mutation and other working conditions of the quasi-closed circulation pipe network water quality comprehensive simulation test system , used to study the injection time, dosage, water quality changes and potential hazards after the intrusion of exogenous pollutants, and to verify the effectiveness of countermeasures, which improves the adaptability of the water quality comprehensive simulation test system for circulating pipe networks. It has important theoretical guiding significance and engineering application value for improving the existing drinking water treatment process, developing new technologies and processes, establishing methods and strategies for drinking water pollution control in pipe networks, and providing safe and high-quality drinking water.

The quasi-closed cycle pipe network water quality comprehensive simulation test system of the present invention provides a good platform for carrying out relevant research on the cause mechanism, influencing factors, and control methods of pipe network water quality pollution, and is useful for transforming existing treatment processes and establishing pipe network water quality pollution control. methods and strategies. The water quality comprehensive simulation test system of the quasi-closed circulation pipe network of the present invention is a new type of medicament such as water quality stabilizer, preservative, disinfection slow-release agent, new technology and means of water supply treatment, new technology, new method, new means such as new pipe material application, etc. Provide a hardware site for safety and effectiveness evaluation and testing, and provide standard methods and means for identification and evaluation of the impact of new technologies and methods on the water quality of the pipe network. Water has important theoretical guiding significance and engineering application value.

Description of drawings

Fig. 1 is a schematic structural diagram of a quasi-closed circulation pipe network water quality comprehensive simulation test system of the present invention.

Detailed ways

As shown in Figure 1, the quasi-closed circulation pipe network water quality comprehensive simulation test system of the present invention consists of 1 water supply subsystem and 4 independent circulation pipes connected to the water supply subsystem by the pipeline 2 (hereinafter referred to as pipeline 2) of the water supply subsystem network subsystem.

The water supply subsystem includes a water supply tank 1, a pipeline 2, a mixing circulation pump 3, a valve 4, a valve 5, a valve 19 and a pipeline 6. The water supply tank 1 is cylindrical and has a volume of 6000L. The water supply tank 1 includes a water outlet 101 of the water supply tank 1 , the water inlet 102 of the water supply tank 1, the medicament injection port 103 of the water supply tank 1, the outlet 104 of the water supply tank 1, the inlet 105 of the water supply tank 1 and the dustproof cover 106 of the water supply tank, the water outlet 101 of the water supply tank 1 is located near the water supply tank 1 The side wall of the water supply tank 1 on the bottom surface; the outlet 101 of the water supply tank 1 is connected with a valve 19, which is used to control the opening and closing of the water supply tank 1, and is connected to the independent circulation pipe network subsystem through the pipeline 2 connected in series with the valve 19 The water inlet 102 of the water supply tank 1 and the medicament injection port 103 of the water supply tank 1 are located on the top surface of the water supply tank 1, and the outlet 104 of the water supply tank 1 is positioned at the side wall of the water supply tank 1 near the water supply tank 1 bottom surface, and the inlet of the water supply tank 1 105 is located on the side wall of the water supply tank 1 close to the top surface of the water supply tank 1, and the dustproof cover 106 of the water supply tank is covered on the casing of the water supply tank 1, and the top side wall of the water supply tank 1 is provided with a small exhaust through hole (not marked) . The outlet 104 of the water supply tank 1 is connected with the inlet of the mixing circulation pump 3 through the pipeline 6 connected with the valve 5 in series, and the outlet of the mixing circulation pump 3 is connected with the inlet 105 of the water supply tank through the pipeline 6 with the valve 4 connected in series, and the outlet of the pipeline 2 The inner diameter is 150 mm, and the inner diameter of the pipe 6 is 80 mm.

The four independent circulation pipe network subsystems are the first independent circulation pipe network subsystem, the second independent circulation pipe network subsystem, the third independent circulation pipe network subsystem and the fourth independent circulation pipe network subsystem.

The first independent circulation pipe network subsystem includes a main circulation pump 7, an electromagnetic flowmeter 8, a high-level replenishment and exhaust water tank 9, pipes 10 of the independent circulation pipe network subsystem, a water replenishment system 11, a venting branch 12, a water quality monitoring system 13, A first medicament filling system 15 , a second medicament filling system 16 , a valve 17 and a valve 18 . The main circulation pump 7, the electromagnetic flowmeter 8 and the high-level replenishment and exhaust water tank 9 are sequentially connected in series through the pipeline 10 of the independent circulation pipe network subsystem to form a circuit. There is a valve 17 . The top surfaces of the high-level replenishment and exhaust water tank 9 and the water supply water tank 1 are located at the highest level of the water quality comprehensive simulation test system of the quasi-closed circulation pipe network; the placement position of the main circulation pump 7 is located at the lowest position of the quasi-closed circulation pipe network water quality comprehensive simulation test system . The total length of the pipes 10 of the independent circulation pipe network subsystem is 78m, and the inner diameter of the pipes of the independent circulation pipe network subsystem is 150mm.

The high-level replenishment and exhaust water tank 9 is cylindrical, with a volume of 400L, and its height is consistent with that of the water supply tank 1. The high-level replenishment and exhaust water tank 9 has a built-in circular piston-shaped floating cover 903, and its area is slightly smaller than the high-level replenishment and exhaust water tank 9, so that When the piston-shaped floating cover 903 is placed horizontally, a certain gap can be left with the inner wall of the high-level replenishment and exhaust water tank 9. The density of the piston-shaped floating cover 903 is less than that of water, and the piston-shaped floating cover 903 is made of a thin stainless steel plate. Closed piston type floating cover filled with air in the middle. When the high-level replenishment and exhaust water tank 9 was full of water, the piston-shaped floating cover 903 moved up and down along the rising or lowering of the high-level replenishment and exhaust water tank 9 water level under the effect of the buoyancy of the water. The top of the high-level replenishment and exhaust water tank 9 is covered with a dustproof cover 904. The area of the dust-proof cover 904 is slightly larger than the top surface of the high-level replenishment and exhaust water tank 9, and it is effectively supported on the high-level replenishment and exhaust water tank 9. The side wall of the high-level replenishment and exhaust water tank 9 top surface is provided with a small through hole (not marked) for exhaust, which can smoothly remove the water in the pipeline 10 of the independent circulation pipe network subsystem. Air out. In this way, the air in the pipeline 10 of the independent circulation pipe network subsystem can be exhausted through the gap between the piston-shaped floating cover and the pipe wall of the high-level replenishment and exhaust water tank 9, and the high-level water replenishment and drainage can also be realized through the piston-shaped floating cover. The quasi-closed isolation of gas water tank 9. The high-level replenishment and exhaust water tank 9 is provided with a water inlet 901 of the high-level replenishment and exhaust water tank and a water outlet 902 of the high-level replenishment and exhaust water tank. Position, the water outlet 902 of the high-level replenishment and exhaust water tank is located on the side wall of the high-level replenishment and exhaust water tank near the bottom surface of the high-level replenishment and exhaust water tank and is lower than the water inlet 901 of the high-level replenishment and exhaust water tank. A valve 18 is provided on the pipeline 10 of the independent circulation pipe network subsystem near the water inlet 901 of the high-level replenishment and exhaust water tank 9. The valve 18 is an electric valve, which adopts an industrial process control valve and can adjust the opening degree. Under the same condition, the flow of water in the pipeline can also be controlled by adjusting the opening of the valve 18 .

The pipeline 10 of the independent circulation pipeline network subsystem is provided with the first outlet 1001 of the pipeline 10 of the independent circulation pipeline network subsystem, the second outlet 1002 of the pipeline 10 of the independent circulation pipeline network subsystem, the pipeline 10 of the independent circulation pipeline network subsystem The third inlet 1003 (water inlet of the loop), the fourth outlet 1004 of the pipeline 10 of the independent circulation pipe network subsystem, the first inlet 1005 of the pipeline 10 of the independent circulation pipe network subsystem, the pipeline of the independent circulation pipe network subsystem The second inlet 1006 of 10 and the third inlet 1007 of the pipe 10 of the independent circulation pipe network subsystem.

The water quality monitoring system 13 is composed of a water quality monitoring circulation pipeline branch 1301 and a water quality monitoring non-circulation pipeline branch 1302. The water quality monitoring circulation pipeline branch 1301 is composed of a conductivity meter (not shown), a pH meter (not shown) and dissolved oxygen The three testers (not marked) are connected in parallel, and the water quality monitoring circulation pipeline branch 1301 is connected to the first outlet 1001 of the pipeline of the independent circulation pipe network subsystem and the pipe of the independent circulation pipe network subsystem through a pipe with an inner diameter of 20mm. First import 1005. The water quality monitoring non-recirculating pipeline branch 1302 is composed of residual chlorine detector (not shown), turbidity detector (not shown) and particle content detector (not shown) connected in parallel. The water quality monitoring non-circulating loop 1302 One end is connected to the first outlet 1001 of the pipe of the independent circulation pipe network subsystem through a pipe with an inner diameter of 20 mm, and the other end is connected to the trench.

The second outlet 1002 of the pipeline 10 of the independent circulation pipe network subsystem is connected to a vent branch 12 composed of a vent valve 1201 and a system vent pipe 1202 connected in series. The third inlet 1003 of the pipe of the independent circulation pipe network subsystem communicates with the water outlet 101 of the water supply tank 1 through the pipe 2; the fourth outlet 1004 of the pipe 10 of the independent circulation pipe network subsystem is connected with a second valve (not marked) Open the valve when collecting water samples, carry out required tests after collecting water samples, and close the valve at other times; the second inlet 1006 of the pipeline 10 of the independent circulation pipe network subsystem is connected with the first medicament filling The tank 1501 and the first precision metering pump 1502 are connected in series to form the first medicament filling system 15, and the third inlet 1007 of the pipeline 10 of the independent circulation pipe network subsystem is connected with the second medicament filling tank 1601 and the second precision metering system. The filling pump 1602 is connected in series to form the second medicament filling system 16 .

A first valve 14 is arranged between the water supply subsystem and the first independent circulation pipe network subsystem; the first valve 14 is connected with the pipeline 1101 of the water supply system, the experimental water filling tank 1102, the experimental water filling pump 1103 and the electromagnetic flowmeter The replenishment system 11 composed of 1104 in series is connected in parallel, the outlet of the electromagnetic flowmeter 1104 is connected with the pipeline 10 of the independent circulation pipe network subsystem through the pipeline 1101 of the replenishment system, and the inlet of the experimental water filling tank 1102 is connected with the pipeline 1101 of the replenishment system and the pipeline 2 Connected; the inner diameter of the pipeline 1101 of the replenishment system is 50mm, the volume of the experimental water filling tank 1102 is 100L, and there is a float water inlet valve inside.

The water supply subsystem is connected to the second independent circulation pipe network subsystem, the third independent circulation pipe network subsystem and the fourth independent circulation pipe network subsystem through the above connection method, the second independent circulation pipe network subsystem, the third independent circulation pipe network subsystem The pipe network subsystem and the fourth independent circulation pipe network subsystem communicate with the water supply subsystem through the B end, C end, and D end of the pipe 2 respectively.

The pipes and equipment of each independent circulation pipe network subsystem are the same, the difference is that the pipes of the independent circulation pipe network subsystem are different, the pipes of the independent circulation pipe network subsystem of the first independent circulation pipe network subsystem It is ductile iron pipe, the pipe of the independent circulation pipe network subsystem of the second independent circulation pipe network subsystem is PE pipe, the pipe of the independent circulation pipe network subsystem of the third independent circulation pipe network subsystem is stainless steel pipe, and the fourth independent circulation pipe network subsystem is made of stainless steel pipe. The pipes of the independent circulation pipe network subsystem of the circulation pipe network subsystem are ductile iron pipes. Ductile iron pipes are more commonly used. The comprehensive simulation experiment of water quality in the circulating pipe network is of great significance to the physical, chemical and biological changes of water quality simulated in the ductile iron pipe during transportation. The time required for the test is relatively long, and there are many comprehensive water quality simulation tests using ductile iron pipes in the circulation pipe network. The pipes of the independent circulation pipe network subsystem of the fourth independent circulation pipe network subsystem all adopt ductile iron pipes to meet the test requirements.

The specific working process of the quasi-closed circulation pipe network water quality comprehensive simulation test system of the present invention is as follows: first, through the water inlet 102 of the water supply water tank 1, add more than 2000 liters of water to the water supply water tank 1 to be entered into the pipe network cycle test and need to study its water quality change law Raw water. This step can be used in 2 ways, the first is to directly transport the factory water from the waterworks to be studied with the water storage vehicle, and directly pour the water into the water supply tank 1 through the water inlet 102 of the water supply tank 1. The second is to add more than 2000 liters of tap water at the end of the pipe network to the water supply tank 1 through the water inlet 102 of the water supply tank 1, and then according to the main water quality index to be studied in the test, the concentration will be prepared through the medicament injection port 103 of the water supply tank 1. Chemicals (such as adding sodium hypochlorite to simulate chlorination and disinfection of tap water before entering the pipe network, and studying the physical law of water quality changes after tap water with different concentrations of chloride ions flow in the pipe network for a long time and for a long time), poured into the water supply tank for more than 1 Realize manual deployment of test raw water. Secondly, according to the needs, valve 4 and valve 5 can be opened, and the mixing circulation pump 3 is started, so that the water in the water supply tank 1 comes out from the outlet 104 of the water supply tank 1, and then returns to the inlet 105 of the water supply tank 1, so that the water in the water supply tank 1 The water and the injected medicinal solution are mixed evenly.

Open the valve 19, the first valve 14, the valve 17 and the valve 18, so that the water in the water supply tank 1 is poured into the pipeline 10 (that is, the pipeline 10 of the independent circulation pipe network subsystem) under the action of gravity, and the high-level exhaust water replenishment water tank When the liquid level of 9 and water supply tank 1 is constant and the same level, it can be determined that the test water has been basically filled (of course there are many air bubbles that cannot be discharged). The pipeline 10 is filled with water, and then the first valve 14 is closed, and the water supply tank The raw water in 1 will be transported to the experimental water filling tank 1102 under the gravitational potential energy through the pipeline 2 connected with it, until the water level in the tank rises to drive the float valve inside to close the water inlet of the tank, and the water storage in the filling tank 1102 Under the action of the experimental water filling pump 1103 of the supplementary water system 11, it will be injected into the pipeline 10 of the independent circulation pipe network subsystem, and the electromagnetic flowmeter 1104 can display the supplementary water flow of the experimental water and accumulate the supplementary water flow. Under the action of the water replenishment system 11, the circulation pipe network subsystem is replenished with water, so that the test raw water liquid level in the high-level exhaust water replenishment water tank reaches the higher liquid level at the high 3/4 of the high-level exhaust water replenishment water tank (make this as far as possible The test raw water that water tank accumulates more, generally can be higher than water supply water tank liquid level), afterward replenishment system 11 is closed, can open again according to the needs of replenishment.

Begin to start the main circulation pump 7, the main circulation pump 7 is a variable frequency circulation pump, and the circulation loop flow is realized by adjusting the frequency of the main circulation pump 7, and the water in the pipeline 10 circulates under the action of the main circulation pump 7, and the water in the pipeline 10 Bubbles will be taken to the high-level replenishment and exhaust water tank 9 by the circulating water and discharged: due to the certain height difference between the water inlet 901 of the high-level replenishment and exhaust water tank 9 and the water outlet 902 of the high-level replenishment and exhaust water tank 9, water flows from The water inlet 901 of the high-level replenishment and exhaust water tank 9 comes in, and is sucked away from the water outlet 902 of the high-level replenishment and exhaust water tank 9. The running track in the high-level replenishment and exhaust water tank 9 is from top to bottom, and is brought into After the air bubbles come in from the water inlet 901 of the high-level replenishment and exhaust water tank 9, although they will move from top to bottom with the circulating water running track under the action of inertia to the water outlet 902 of the high-level replenishment and exhaust water tank 9, due to Its density is very small, and it will rise under the great buoyancy force, and will not be sucked into the pipeline by the water outlet 902 under the buffer of a sufficiently large height difference between the water inlet 901 and the water outlet 902 of the high-level replenishment and exhaust water tank 9 , but will be discharged through a certain gap between the piston-shaped floating cover 903 and the inner wall of the high-level replenishment and exhaust water tank 9 after floating, and finally pass through the vent for exhaust provided by the box body of the high-level replenishment and exhaust water tank 9 hole drain. When the water level in the high-level water replenishment and exhaust water tank 9 is low due to the exhaust water level, the water replenishment system 11 can be used to replenish water, so that the high-level water replenishment and exhaust water tank 9 maintains a certain high liquid level, preventing air from entering the independent circulation pipe again In the network subsystem, the electromagnetic flowmeter 8 will feed back the circulation flow in the pipeline 10 controlled by the frequency conversion of the main circulation pump 7. The independent circulation pipeline network subsystem formed in this way can make the test raw water in the pipeline 10 relatively closed. Circulation is a quasi-closed circulation, so that the various situations simulated and the results obtained by the simulation test of the quasi-closed circulation pipe network water quality comprehensive simulation test system are closer to reality.

The water quality monitoring system 13 is composed of a water quality monitoring circulation pipeline branch 1301 and a water quality monitoring non-circulation pipeline branch 1302. The water quality monitoring circulation pipeline branch 1301 is composed of an online conductivity meter (not shown), a pH meter (not shown) and a dissolved The oxygen tester (not marked) is connected in parallel, and the water quality monitoring circulation pipeline branch 1301 is connected to the first outlet 1001 of the pipeline of the water quality monitoring independent circulation pipe network subsystem and the independent circulation pipe network through a pipe with an inner diameter of 20mm. The first inlet 1005 of the pipeline of the system can be monitored at any time. Since there is no need to add reagents in the monitoring of conductivity, water pH and dissolved oxygen, and no chemical changes are involved, the monitored water quality can basically be regarded as not changing or not changing. Therefore, the above-mentioned water samples can be returned to the pipeline 10 through the water quality monitoring circulation pipeline branch 1301 after being monitored, and the monitoring can be carried out at any time during the pipeline operation. The water quality monitoring non-recirculating pipeline branch 1302 is composed of an online residual chlorine detector (not shown), a turbidity detector (not shown) and a particle content detector (not shown) connected in parallel. The water quality monitoring non-circulating pipeline branch One end of the road 1302 is connected to the first outlet 1001 of the pipe 10 of the independent circulation pipe network subsystem through a pipe with an inner diameter of 20mm, and the other end is connected to the trench. Since the circuit of this design involves the addition of reagents, the quality of the test water in the circulation pipeline is changed, or the pressure is lost after the water is diverted out for detection, and it cannot be returned to the circulation main pipe through the pressure difference. In order not to affect or pollute the water quality in the pipeline 10, The depressurized water after monitoring the water samples for residual chlorine monitoring, turbidity monitoring and particle content monitoring is directly discharged into the sewer, so that the water in the pipeline 10 will decrease thereupon, although it is used for online monitoring and sampling discharge The amount of water in the water sample is small, but the cumulative loss will be large if the sampling is continuously turned on, which will affect the accuracy of the test. Therefore, in order to reduce the loss of water samples, the interval between residual chlorine monitoring, turbidity monitoring and particle content monitoring can be adjusted. Set according to needs, and the collection of water samples generally used for online monitoring of residual chlorine, turbidity and particle content should not be too frequent on the basis of meeting the requirements of test data. Simultaneously, the water storage that participates in the cycle in the high-level water replenishment and exhaust water tank 9 can be supplemented at any time (under special test conditions, the replenishment demand in the pipeline 10 exceeds the maximum water replenishment capacity that can be provided in the high-level exhaust water replenishment tank 9, and can also Quickly and timely replenish water through the water replenishment system 11), so that the circulating water in the pipeline 10 runs stably.

In addition to the water quality monitoring system 13 monitoring the electrical conductivity, water pH, dissolved oxygen, residual chlorine, turbidity and particle content in the pipeline 10 of the independent circulation pipe network subsystem, the second valve with the second valve of the pipeline 10 can also The four outlets 1004, through the opening and closing of the second valve, carry out manual sampling to take water, and then transfer the collected water samples to the analysis instrument for off-line detection.

In addition to the changes in conductivity, water pH, dissolved oxygen, residual chlorine, turbidity and particle content in the pipeline 10 of the independent circulation pipe network subsystem monitored by the water quality monitoring system 13, the quasi-closed circulation pipe network water quality comprehensive simulation of the present invention The test system can also directly add medicament to the test raw water in the pipeline 10 through the first medicament filling system 15 and the second medicament filling system 16, which can simulate the secondary addition of disinfectant on the way to the actual water supply network (such as the secondary Chlorination) after the water quality change process, the medicament is put into the first medicament filling tank 1501 and the second medicament filling tank 1601, then in the first precision metering filling pump 1502 and the second precision metering filling pump 1602 (as required , under the action of setting the interval time of addition and each addition amount), it is put into the pipeline 10 of the independent circulation pipe network subsystem.

At present, domestic waterworks only add enough chlorine disinfectant to the factory water at one time, so as to keep the tap water that meets the water quality standard at the factory and still maintain good water quality when it reaches the user's faucet after long-distance transportation through the pipe network. However, the delivery pipelines from the factory water to the end of the faucet of the pipe network users are long or short. In order to maintain the water quality of the tap water with the longest pipeline retention time, it may be necessary to add more disinfectants when leaving the factory, which will bring a lot of trouble. The harm of tap water disinfection by-products exceeding the standard for users connected to short pipe networks, if the dosage is less, the tap water of users connected to longer pipe networks may have bacteria and organic matter exceeding the standard, and the water quality cannot be kept up to standard. This is a dilemma. Therefore, many advanced cities in foreign countries have added equipment for secondary chlorine addition (other disinfectants can also be added) at suitable nodes in the middle of the long pipeline network connection through the optimization analysis of the pipeline network to reduce the amount of chlorine added to the factory water once. It can greatly reduce the residual hazards of disinfection by-products in tap water. However, the first medicament filling system 15 and the second medicament filling system 16 of the present invention can simulate the secondary and tertiary tests of adding disinfectant to the pipe network. Then, the water quality in the pipeline 10 of the independent circulation pipeline network subsystem is monitored through the water quality monitoring system 13 and the water intake with the second valve connected to the fourth outlet 1004 of the pipeline of the independent circulation pipeline network subsystem, so that it can be quantified Analyze the disinfection effect, water quality after disinfection and the attenuation change law of disinfection products and disinfection by-products.

Claims (10)

1. A quasi-closed circulation pipe network water quality comprehensive simulation test system is characterized in that it comprises a water supply subsystem and an independent circulation pipe network subsystem connected with the water supply subsystem; The water supply subsystem includes a water supply tank with a water inlet, a water outlet and a medicament injection port; The independent circulation pipe network subsystem is a circuit comprising a main circulation pump connected in series through pipelines, an electromagnetic flowmeter and a high-level replenishment and exhaust water tank; the circuit is provided with a water inlet, and the water inlet of the circuit is connected to the water supply tank The water outlet is connected through a pipeline with a first valve; The circuit is connected with a water supply system for replenishing water in the circuit, a venting branch for discharging water in the circuit, and a water quality monitoring system for monitoring the water quality of the water in the circuit; The water replenishment system includes a series-connected experimental water filling tank and an experimental water filling pump, the outlet of the experimental water filling pump is connected to the circuit, the inlet of the experimental water filling tank is connected to the water outlet of the water supply tank connected; The top surfaces of the water supply tank and the high-level supplementary exhaust water tank are close to the same horizontal plane, and the horizontal plane is located at the highest horizontal position of the quasi-closed circulation pipe network water quality comprehensive simulation test system, and the placement of the main circulation pump The location is lower than that of the water supply tank and the high-level replenishment and exhaust tank; The high-level replenishment and exhaust water tank includes a box body and a piston-shaped floating cover located in the box, and there is a gap between the piston-shaped floating cover and the inner wall of the box; the density of the piston-shaped floating cover is less than that of water. density. 2. quasi-closed circulation pipe network water quality comprehensive simulation test system according to claim 1, is characterized in that, the water outlet of described water supply water tank is positioned at the bottom of water supply water tank; The water supply tank is connected with a pipeline branch with a mixing circulation pump, and the two ends of the pipeline branch are respectively communicated with the water supply tank; The top of the water supply tank is covered with a water supply tank dustproof cover with an area slightly larger than the top surface of the water supply tank; The top of the side wall of the water supply tank is provided with a through hole for exhaust. 3. The quasi-closed circulation pipeline network water quality comprehensive simulation test system according to claim 2, characterized in that there is a height difference between the two ends of the pipeline branches. 4. the quasi-closed circulation pipe network water quality comprehensive simulation test system according to claim 1, is characterized in that, the wall surface of described high-level replenishment and exhaust water tank is perpendicular to the bottom surface; The top cover of the high-level replenishment and exhaust water tank has a dust-proof cover of the high-level replenishment and exhaust water tank whose area is slightly larger than the top surface of the high-level replenishment and exhaust water tank; The top of the side wall of the high-level replenishment and exhaust water tank is provided with a through hole for exhaust. 5. The quasi-closed circulation pipe network water quality comprehensive simulation test system according to claim 1 or 4, characterized in that the body of the high-level replenishment and exhaust water tank is cylindrical. 6. The quasi-closed circulation pipe network water quality comprehensive simulation test system according to claim 1, characterized in that, the water outlet of the high-level water replenishment and exhaust water tank is located at the bottom of the high-level water replenishment and exhaust water tank, and the high-level water replenishment drain The water inlet of the gas water tank is higher than the water outlet of the high-level replenishment and exhaust water tank and lower than the high position of 1/2 of the high-level replenishment and exhaust water tank. 7. The quasi-closed circulation pipe network water quality comprehensive simulation test system according to claim 1, characterized in that, the independent circulation pipe network subsystems are multiple and the pipes of the multiple independent circulation pipe network subsystems are the same or different ; The pipes of the independent circulation pipe network subsystem are ductile iron pipes, polyethylene pipes, copper pipes or stainless steel pipes. 8. The quasi-closed circulation pipe network water quality comprehensive simulation test system according to claim 1, wherein the water quality monitoring system is composed of a water quality monitoring circulation pipeline branch and a water quality monitoring non-circulation pipeline branch; The branch circuit of the water quality monitoring circulation pipeline includes a conductivity meter, a pH meter and a dissolved oxygen tester connected in parallel, and the two ends of the branch circuit of the water quality monitoring circulation pipeline are respectively connected with the pipelines of the independent circulation pipe network subsystem; The non-recyclable pipeline branch for water quality monitoring includes a parallel residual chlorine detector, turbidity detector and particle content detector, and one end of the non-circulatory pipeline branch for water quality monitoring is connected to the pipeline of the independent circulation pipe network subsystem , and the other end is connected to the trench. 9. The quasi-closed circulation pipe network water quality comprehensive simulation test system according to claim 1, characterized in that, the pipeline of the independent circulation pipe network subsystem is connected with a medicament filling system, and the medicament filling system Including the medicament filling tank and the medicament filling pump connected in series. 10. quasi-closed circulation pipe network water quality comprehensive simulation test system according to claim 1, is characterized in that, the bottom surface of described main circulation pump is positioned at the lowest level of quasi closed circulation pipe network water quality comprehensive simulation test system; An outlet for manual water sampling with a second valve is provided on the pipe of the independent circulation pipe network subsystem.

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