A municipal circulating water distribution network system

Abstract

The present invention discloses a municipal circulating water supply and distribution network system, characterized in that the water supply and distribution network system includes a main water supply ring pipe and a main return water ring pipe arranged in parallel along the road outside the water supply range, the main water supply ring pipe is connected to the water supply system of each block through a water supply branch pipe, and the water supply system of each block is connected to the main return water ring pipe through a return water branch pipe, and the main water supply ring pipe and the main return water ring pipe are connected to a booster circulation integrated pump station. The present invention greatly improves the fluidity of water in the pipe network, solves the problem of dead water sections that are prone to occur in traditional pipe networks, and prevents water quality deterioration; the annular arrangement of the water supply pipe and the return pipe allows for the flexible addition of water supply and return water branches, flexibly solving the problem of differences in water volume development among the blocks.

Description

Technical Field

[0001] The present invention relates to the technical field of municipal water supply engineering, and in particular to a municipal circulating water distribution pipe network system, which is suitable for the layout of small and medium-sized municipal water distribution pipe networks with high water quality assurance requirements. Background Art

[0002] In recent years, to meet people's demand for "high-quality water," various regions have successively carried out water purification plant process upgrades and deep treatment projects, which has significantly improved the water quality of the water leaving the factory. However, a large number of studies have shown that in the water distribution network, it is not only necessary to consider the issue of water distribution, but also to pay sufficient attention to the water quality in the network. However, it is a common situation that in traditional ring-shaped water distribution networks, the retention time of purified water in the network is too long, especially at the end of the network, which poses a certain risk of water quality deterioration. At the same time, excessive retention time leads to further consumption of residual chlorine in the water, reducing the biological safety of the water. The above phenomenon is mainly caused by the following reasons:

[0003] First, adhering to the principle of "designing for the worst-case operating condition," traditional water distribution networks are typically designed for the highest daily and hourly operating conditions of urban water supply. In daily operation, especially during periods of low water demand, the actual flow rate of purified water in the pipelines is far less than the designed value. Second, to ensure water supply security, traditional water distribution networks often use rings instead of branched pipes, resulting in a large amount of redundant pipes in the system, further increasing the "water age" in the network. Furthermore, in engineering practice, there is a widespread mismatch between planned water demand and actual water demand, further exacerbating these adverse effects.

[0004] Therefore, there is an urgent need for a new water supply and distribution network layout method that can reduce water age, ensure water quality, flexibly adjust, and be safe and reliable, so as to avoid a series of water quality problems that may be caused by traditional pipelines. Summary of the Invention

[0005] The purpose of the present invention is to provide a municipal circulating water distribution network system to improve the fluidity of the water distribution network, ensure water quality, prevent the generation of "stagnant water", and enable the water flow in the network to circulate back.

[0006] In order to achieve the above-mentioned purpose, the technical solution of the present invention is as follows: a municipal circulating water supply and distribution network system, characterized in that the water supply and distribution network system includes a main water supply ring pipe and a main return water ring pipe arranged in parallel along the road outside the water supply range, the main water supply ring pipe is connected to the water supply system of each block through a water supply branch pipe, and the water supply system of each block is connected to the main return water ring pipe through a return water branch pipe, and the main water supply ring pipe and the main return water ring pipe are connected to the booster circulation integrated pump station.

[0007] Furthermore, the starting end of the main water supply ring pipe is provided with a common water supply valve, and the end is provided with a main water supply emergency valve; the starting end of the main return water ring pipe is provided with a main return water emergency valve, and the end is provided with a common return water valve.

[0008] Furthermore, metering devices and flow control valves are provided on the main water supply ring pipe and the main return water ring pipe, and branch pipe flow control valves and flow balancing valves are provided on the water supply branch pipe and the return water branch pipe respectively, and a backflow prevention device is provided on the water supply branch pipe.

[0009] The boosting circulation integrated pump station includes a circulation pump group, the outlet pipe of the circulation pump group is connected to the main water supply ring pipe, and the inlet pipe of the circulation pump group is connected to the main return water ring pipe through a first switching valve. The boosting circulation integrated pump station also includes a water reservoir, the input end of the water reservoir is connected to the water inlet main pipe, and the output end of the water reservoir is connected to the outlet pipe of the boosting pump group through a pipeline. The water inlet main pipe is also connected to the inlet pipe of the boosting pump group through a bypass pipe, the outlet pipe of the boosting pump group is connected to the inlet pipe of the circulation pump group, and the main return water ring pipe is also connected to the inlet main pipe through a second switching valve.

[0010] Furthermore, the booster circulation integrated pump station also includes a chlorine supply device, which is connected to the chlorine supply points arranged at the water reservoir input end, the water reservoir output end and the water inlet pipe of the circulation pump group through a chlorine supply pipeline.

[0011] The present invention also provides a circulating water distribution method for a municipal circulating water distribution network system with high water quality assurance, which improves the fluidity of the water distribution network, prevents the generation of "dead water", and enables the water flow in the network to circulate back.

[0012] In order to achieve the above-mentioned purpose, the technical solution of the present invention is as follows: a circulating water distribution method of a municipal circulating water distribution network system with high water quality assurance, characterized in that: the pressurized water or circulating water passing through the booster circulation integrated pump station enters the main water supply ring pipe and enters the water supply system of each block through the water supply branch pipe, and the unconsumed return water utilizes the residual pressure to enter the main return water ring pipe through the return water branch pipe, and finally enters the booster circulation integrated pump station for circulation.

[0013] Furthermore, when an accident occurs at a certain point in the pipeline, the maintenance valves on both sides of the accident area are closed nearby, and the water supply emergency valve is opened to make the main water supply ring pipe flow in the opposite direction to ensure the water supply needs of most areas; at the same time, the commonly used return water valve is closed and the return water emergency valve is opened, thereby ensuring the same-flow form of the water supply pipeline.

[0014] The present invention sets a circulation pump group, a main water supply ring pipe and a main return water ring pipe in the water supply area, so that the outlet points of each branch pipe can meet the principle of "co-route arrangement", ensure the formation of circulation, and prevent short-circuit; by setting a circulating water pump, the fluidity of water in the pipe network is greatly improved, and the generation of dead water is avoided; the inlet and outlet valves of the circulating pump station are reasonably designed. When an accident occurs in the main water supply ring pipe, reverse water supply and backflow are achieved by switching the valves, which greatly improves the safety of the water distribution network, and the scientific pipeline layout can reasonably retain residual pressure and reduce energy consumption; through the annular arrangement of the water supply pipe and the return pipe, branch pipes can be flexibly added to solve the problem of different water volume development in different plots, with high flexibility; chlorine replenishment facilities are set in the circulating booster integrated pump station. When the water from the water treatment plant or the residual chlorine in the circulating water cannot be guaranteed, chlorine can be replenished in time to improve biological safety. A regulating and storage tank is set in the circulating pump station to coordinate the contradiction between the water output of the water plant and the instantaneous water demand of the users, and improve the regulating and storage capacity and safety of the water supply system. This invention is distinguished by its ability to improve the fluidity of water distribution networks, preventing the formation of "stagnant water" and enabling water circulation and backflow within the network. This ensures water supply requirements in the event of an emergency (e.g., partial pipeline damage). In medium- to large-scale urban water supply systems, water supply can be divided into zones, and the inlet pipes of the booster circulation integrated pumping stations in each zone can be arranged in a loop, further enhancing safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is an example diagram of the system layout of the present invention.

[0016] Figure 2 This is a schematic diagram of the layout of the boosting and circulating integrated pump station in the present invention.

[0017] Figure 3 This is a schematic diagram of the operation of the present invention under accident conditions.

[0018] The figure includes: a booster circulation integrated pump station 1, a main water supply ring pipe 2, a main return water ring pipe 3, a plot 4, a water supply branch pipe 5, a return water branch pipe 6, an emergency valve of the main water supply ring pipe 9, an emergency valve of the main return water ring pipe 10, a water inlet main pipe 11, a metering device 12, a flow control valve 13, a backflow prevention device 15, a water reservoir 16, a booster pump group 17, a circulation pump group 18, a second switching valve 19, a first switching valve 21, a common water supply valve 22, a common return water valve 23, a chlorine replenishing device 24, and an override pipe 26. DETAILED DESCRIPTION

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0020] like Figure 1The system layout diagram of the present invention is shown. The system mainly consists of a booster circulation integrated pump station 1, a main water supply ring pipe 2, a main return water ring pipe 3, a water supply branch pipe 5, a return water branch pipe 6, a main water supply ring pipe emergency valve 9, and a main return water ring pipe emergency valve 10. As shown in the figure, the internal layout diagram of the booster circulation integrated pump station 1 is shown in detail. Figure 2 .

[0021] The incoming water enters the boosting and circulating integrated pump station 1 from the main water inlet pipe 11. The main water supply ring pipe 2 and the main return water ring pipe 3 are arranged in parallel along the road outside the water supply range. The outlet end and the return water section of the boosting and circulating integrated pump station 1 are connected to the main water supply ring pipe 2 and the main return water ring pipe 3 respectively. The water supply branch pipe 5 and the return water branch pipe 6 are connected from the main water supply ring pipe 2 and the main return water ring pipe 3 respectively to realize water supply to the plot 4 and ensure the water supply and return water circulation of each plot. Under normal working conditions, the boosting water or circulating water passing through the boosting and circulating integrated pump station 1 enters the main water supply ring pipe 2 and enters each water receiving plot through the water supply branch pipe 5. The unconsumed return water uses the residual pressure to enter the main return water ring pipe 3 through the return water branch pipe 6, and finally enters the boosting and circulating integrated pump station 1 for circulation. To ensure normal circulation, metering devices 12 and flow control valves 13 should be installed at appropriate locations on the main water supply loop 2 and main return loop 3 to meet the control requirements of the water pumps and valves. Branch flow control valves 7 and flow balancing valves 8 should also be installed on the water supply branch pipes 5 and return branch pipes 6 of each plot, respectively. A backflow prevention device 15 should be installed on the water supply branch pipe 5. The layout of the main water supply loop 2 and main return loop 3 essentially ensures the principle of "co-routing" the water supply branch pipes 5 and return branch pipes 6 of different plots, facilitating circulation. Each plot can connect to the main water supply loop 2 and main return loop 3 at its nearest location, or it can be connected in groups (as shown in the middle plot).

[0022] Figure 2This is a schematic diagram of the internal layout of the integrated booster and circulation pump station 1. Upstream water enters the regulating and storage reservoir 16 through the main inlet pipe 11. When the residual pressure of the incoming water is high, for energy conservation purposes, the bypass pipe 26 can be activated to directly flow the water into the booster pump unit 17 for superimposed boosting. Alternatively, depending on the inlet pressure, the water can be directly replenished with chlorine before entering the main water supply loop 2. Under normal operating conditions, the emergency valves 9 and 10 of the main water return loop should be closed. To prevent water stagnation in the system, valves 9 and 10 should be opened regularly under normal operating conditions. The booster pump unit is primarily responsible for replenishing water to the main water supply loop 2, and the outlet pressure should meet the user's requirements at the most unfavorable point. The outlet pipe of the circulation pump unit 18 is connected to the main water supply loop 2, and the incoming water returns to the loop 3. Multiple variable frequency speed-controlled pumps are installed to circulate water within the water distribution network. By closing first switching valve 21 and opening second switching valve 19, return water can flow back to water inlet pipe 11, and circulation can be achieved using booster pump unit 17, providing more flexible operating conditions. A chlorine replenishment device 24 should be installed in the booster circulation integrated pump station. Chlorine addition points can be set before and after the water reservoir 16 and on the water inlet pipe of the circulation pump unit to meet the chlorine replenishment and disinfection requirements under different operating conditions.

[0023] Figure 3 What is shown is a schematic diagram of the working condition when an accident occurs in the main water supply ring pipe 2. When an accident occurs at a certain point in the pipeline, first close the maintenance valves on both sides of the water outage area nearby, open the water supply emergency valve 9, and make the main water supply ring pipe 2 flow in the opposite direction to ensure the water supply needs of most areas; at the same time, close the common return water valve 23, and open the return water emergency valve 10, thereby ensuring the same-flow form of the water supply pipeline. As can be seen from the figure, most water-using plots can realize the circulation of water in the pipeline network under accident conditions, ensuring normal water supply and high safety. It is obvious that when the common water supply valve 22 and the water supply emergency valve 9 on the water supply main are opened at the same time and the circulating pump group is opened, the present invention is similar to the traditional two-pipe water supply system, and the water supply capacity is greatly increased. Therefore, this system has extremely high flexibility and safety.

[0024] In summary, it is different from the existing technology in that: first, the booster pump station of the traditional water supply and distribution system generally only has the functions of regulating and boosting, while the pump station in the present invention also has the function of circulating water flow. Secondly, the traditional water supply and distribution network is a ring network. Under different working conditions, there is a phenomenon of low flow velocity in some parts of the network, which is easy to form dead water areas and the water quality is easily affected. However, in the present invention, the flow of water in the municipal pipeline is guaranteed by the setting of the main water supply ring pipe and the main return water ring pipe and the variable frequency regulation of the circulation pump, which greatly reduces the risk of water quality deterioration. In addition, the access method of the water supply branch pipe and the return water branch pipe of each block within the water supply range can flexibly arrange the construction sequence and does not pose a threat to the water quality safety of the main pipe, which is also difficult to achieve in the traditional system. Finally, emergency valves are set on the main water supply ring pipe and the main return water pipe to ensure the normal operation of the pipe network system in the event of an accident, which is relatively safe and reliable. Among them, chlorine replenishment facilities, water pump groups, equipment and their controls belong to the existing technology and will not be described in detail here.

Claims

1. A municipal circulating water distribution network system, characterized in that: The water supply and distribution network system includes a main water supply ring pipe and a main return water ring pipe arranged in parallel along the road outside the water supply range. The main water supply ring pipe is connected to the water supply system of each block through a water supply branch pipe, and the water supply system of each block is connected to the main return water ring pipe through a return water branch pipe. The main water supply ring pipe and the main return water ring pipe are connected to a booster circulation integrated pump station. A common water supply valve is provided at the starting end of the main water supply ring pipe, and a main water supply ring pipe emergency valve is provided at the end. A main return water ring pipe emergency valve is provided at the starting end, and a common return water valve is provided at the end. A backflow prevention device is provided on the water supply branch pipe.

2. A municipal circulating water distribution network system according to claim 1, characterized in that: Metering devices and flow control valves are installed on the main water supply ring pipe and the main return water ring pipe, and branch pipe flow control valves and flow balancing valves are installed on the water supply branch pipe and the return branch pipe respectively.

3. A municipal circulating water distribution network system according to claim 1, characterized in that: The boosting circulation integrated pump station includes a circulation pump group, the outlet pipe of the circulation pump group is connected to the main water supply ring pipe, and the inlet pipe of the circulation pump group is connected to the main return water ring pipe through a first switching valve. The boosting circulation integrated pump station also includes a water reservoir, the input end of the water reservoir is connected to the water inlet main pipe, and the output end of the water reservoir is connected to the outlet pipe of the boosting pump group through a pipeline. The water inlet main pipe is also connected to the inlet pipe of the boosting pump group through a bypass pipe, the outlet pipe of the boosting pump group is connected to the inlet pipe of the circulation pump group, and the main return water ring pipe is also connected to the inlet main pipe through a second switching valve.

4. A municipal circulating water distribution network system according to claim 3, characterized in that: The booster circulation integrated pump station also includes a chlorine supply device, which is connected to the chlorine supply points arranged at the input end of the water reservoir, the output end of the water reservoir and the water inlet pipe of the circulation pump group through a chlorine supply pipeline.

5. The circulating water supply and distribution method of the municipal circulating water supply and distribution pipe network system according to claim 1, characterized in that: The outlet water from the booster circulation integrated pump station enters the main water supply ring pipe and enters the water supply system of each block through the water supply branch pipe. The unconsumed return water uses the residual pressure to enter the main return water ring pipe through the return water branch pipe, and finally enters the booster circulation integrated pump station for circulation.

6. The circulating water supply and distribution method of the municipal circulating water supply and distribution pipe network system according to claim 1, characterized in that: When an accident occurs at a certain point in the pipeline, the maintenance valves on both sides of the accident area are closed nearby, and the emergency valve of the main water supply ring pipe is opened to make the main water supply ring pipe flow in the reverse direction to ensure the water supply needs of most areas; at the same time, the commonly used return water valves are closed and the emergency valve of the main return water ring pipe is opened, thereby ensuring the same-flow form of the water supply pipeline.

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