This article on the pipeline valves artificial-site operation status quo, pipeline valves remote control technology solutions. Practical application shows that the system has played an optimized pipeline network running an important role to improve the safety and reliability of water supply system.
The valve regulation the status quo of the pipe network
In recent years, with technological progress and reconstruction funding, the majority of water supply enterprises to establish a water supply data monitoring and control systems (SCADA), water and raw water conveyance system monitoring, water structure and process equipment monitoring, as well as water supply pipe network manometry function. Part of the water supply enterprises has also established a hotline call center system and the pipe network geographic information system (GIS). The above establishment timely monitoring of water supply equipment running and found in possession of Wangshi so greatly enhance the level of water supply services.
Limited to the technology, equipment and system design philosophy, and many other reasons, also limited to manual scheduling of the pipe network management and run-control. Pressure telemetry and accident information acquisition, collection and judgment to achieve information technology and automation, but the opening and closing valves and regulator must also rely on the operation of the workers to the site manually to complete. This is mainly the following deficiencies:
1 water supply pipe network conditions instantaneous status quo, the real-time optimization of pipe network run by artificial scene to adjust almost impossible to achieve.
(2) To ensure the safe operation of the water supply system in the event of a major water supply accident, you need several important valve in the pipe network repeatedly regulation, manual operation is difficult to do the job.
Judge to the artificial-site regulation valve ③ from the tube the Wangshi so the information access, according to the size of the cities, the repair strength and traffic reports, there will be a delay of about 1 h. This will result in the loss of accident to expand, triggering a related problem.
④ pipe network scheduling mode client can not achieve timely and reasonable regulation and control.
The pipeline valves remote-control significance
Pipeline valves is important facilities in the water supply system, play a conveyor off, regulating water flow, pressure and change the flow of the pipe network regulation, it is important to ensure smooth water supply system transmission and distribution pipe network repair, maintenance, renovation measures .
Pipe network valve timely realization of the above functions directly affect the quality of service of the security of water supply and water supply industries. Importantly, when the water supply system to a major failure and to deal with the large tube rupture, pipeline valves if not timely and effective manner regulation deal with the accident will delay the timing of, the consequences are serious.
Scientific control of the water supply network with real-time regulation must first solve the problem of valve remote-control several important valve key valve in the pipe network, the ability to achieve timely and effective regulation and control of a direct impact on the safety of water supply, directly in the dispatch center of the pipe network valve remote-control operation to guarantee the normal operation of the safety of the water supply system has an important significance.
Implementation
Scientific control of the water supply system to achieve the key is to increase the means of control and operating mode management system innovation. For completely rely on manual regulating valve can not respond promptly to sudden incident handling, is not conducive to the current situation of water supply management and services, through the investigation and analysis of the factors and equipment technical parameters of the project objectives, equipment, work environment, and RTU, electric actuators institutions proposed use of the existing pipeline network manometry the RTU equipment important valves on the pipeline network for telemetry, remote technical solutions, as well as the tube Wangshi so when you deal with and adapt to changes in working conditions, improve water management and service level.
Technical program
① remote communication / control terminal selection
Valve remote-control system of the pipe network and compatible with existing SCADA systems, can make full use of existing equipment, radio spectrum resources. The RTU chosen using existing SCADA system the MOSCAD RTU, to rewrite control procedures based on control objectives.
② PC configuration programming
Set the host computer in the dispatch center end telemetry, remote valve control window, and operation screen, wireless SCADA system based on short-wave radio, real-time detection of the valve end run parameters, command control MOSCAD RTU.
(3) the selection of implementing agencies
Pipeline valves valve installed in a damp environment well, and poor working conditions. In order to ensure control reliability and safety of equipment, the choice of protection class IP68 electric head and high reliability of the valve with as the executing agency, to reach normal operating requirements.
④ Power
Charged with the valve near the unit to find the right power / lighting power charged with a valve system power. Choose electric power situation head drive power way. Conditions permit, the possible use of the power supply as a working power source.
⑤ subsidiary instrument
In order to grasp the situation and the effect of the valve-control valve installed downstream pressure sensor. The acquisition of the pressure signal transmission through the RTU to the SCADA system, usually used as measurement points.
System security measures
In order to ensure the safety of equipment and personal safety, program design and implementation of the project to take technical measures:
① security of electricity supply
Special workplace power box design leakage protection. RTU control electric the head power only during remote-control operation when connected valve the borehole equipment peacetime and mains isolation.
② valve wells and covers design selection
Favorable external environment is an important factor in the safe operation of equipment. Although the design selection of equipment to meet immersion environment, improve system reliability, telecommunications waterproof covers, valve well designed to prevent rainwater intrusion valve well and provide a good external environment for the implementing agencies. The valve shaft design considerations stagnant water as well chamber infiltration processing well Indoors soakaway.
Well indoor setting position design and installation of the reed switch water level switch, because the valve well for some reason the water / seepage, the water level reaches the set height RTU will send water level alarm information prompts overhaul.
③ pipe network security operation
Control valve remote operation to take the "move - stop - move" intermittent operation mode, reducing the valve control pressure fluctuations affect the safe operation of the pipeline network. The control process by the dispatch end host computer - site RTU "under program control to achieve.
The ④ operating authority and system management
Critical valves affect the running of the water supply equipment developed in order to prevent misuse, dispatch center host computer has a login password and manage permissions and Administrative Procedures, such as the implementation of the operation ticket system: remote-control system of valve operation, on a regular basis opening and closing operation of the valve to prevent equipment corrosion, according to the season Timer Remote connected to electric head and built-in moisture-proof dehumidification electric device.
The actual application and run effect
According to the technical design and implementation plan, the transformation of the provincial textile machinery DN800 pipe gateway key valve. October 2005 system commissioning is completed and put into operation, nearly a year production run shows that the system is stable and reliable, to achieve the desired purpose.
Regulation of production scheduling
The valve is important regulation valve in the pipe network, to play adjust Shiyuan, stone water and other main water plant water supply area and adjust the pressure of the Western local pipe network role. Valve remote control system put into use, the dispatch center at any time based on production needs and optimal scheduling of the valve-control operation, achieve optimized production purposes.
Response to the water supply of major accidents
Evening of 1 July 2006 20: 58, by the grid of Henan shock failure impact Shiyuan, Stone Buddha, Eastern Zhou waterworks all discontinued, all measurement points are low pressure alarm. The grid normal water supply system is gradually restored, a large area without water pipe network, the pipeline has accumulated gas pipeline pressure is low. In this case, for safety reasons, the dispatch center to the provincial textile the remote valve remote operation with the Beijing-Guangzhou Road valves manual adjustment, followed by car, according to the pressure changes in scheduling the waterworks of the water supply system to recover in a short period of time.
Response to the pipe network of major accidents
June 19, 14: 10, the Sino-French Water Supply Plant DN1 200 raw water pipeline burst pipe near the Yellow River Bridge toll station, the water treatment plant can not maintain a normal supply. According to the emergency plan, the dispatch center several times on the the provincial textile remote valve for remote operation with the Central Plains Road valves manually adjust, change Shiyuan, stone water plant water supply area, supply in urban areas in central and northern inadequate water supply, to maintain the City District pipe network normal pressure. The above measures basically not affected by the urban water supply, water pressure equalization pipe network.
To expand the application
Remote-control of the important parts of the pipe network and key links valves optimize water supply system is running, raise important technology to ensure water supply security and reliability, but also to the pipe network scheduling mode innovation.
Pipeline valves remote-control system plays a key role in the above application, it was decided that all remote-control system transformation of the Navigation Road DN1 000, Huashan Road DN1 200, Agricultural Road DN800 six pipeline network key valve currently being implemented process.
Application Prospect
The test program selected the RTU, electric head equipment combined mode with high reliability, powerful features, and consider the possibility of further improvement in scale application.
Reduce system costs
Remote communications / remote control device in the application of the test selection based on short-wave communications RTU. Although powerful, but the high cost of single-station equipment. Can try a selection of data acquisition and remote control functions, based on the functional blocks of the wireless digital public network, such as GPRS - RTU, CDMA-RTU to reduce single-station construction costs.
② Power bottlenecks
Valve installed on municipal roads underground pipe network and the appropriate power / lighting mains power supply may not be able to get. Remote-control and mains power can not be solved, you can choose to use a DC power supply, high output torque, low-speed electric head, power lead-acid batteries in key valves.
Choice of electric vehicles used 48V14AH lead-acid battery pack in a month for the rotation of the charge cycle, calculated within the charging cycle of rotation can be completed more than 50 times the fully open - fully closed valve operation, meet the functional requirements. Maintenance and management through the strengthening of the battery charge, there is no valve remote-control can be achieved in the case of mains power. Pursuing a dream content management system
③ large-capacity clean water tank users on the internal the timing regulation can try Timer Remote water supply according to their pipe network conditions, in order to take full advantage of the clean water tank pipe network "peaking" function.
Valve remote-control of the pipeline network, a timely response to the accident and to raise the level of water supply management services; critical and important valve-scale applications can run real-time optimization of the pipe network and reduce the manufacturing cost of supplying water, achieve the scheduling execution automation of important technical means and initiatives, is also a breakthrough of the existing mode of operation scheduling and innovation.
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