First, the basic situation:
Because of the geographical dispersion of urban heating, the stable acquisition and control functions, and the high safety requirements, the heating dispatch department needs to monitor the temperature, pressure, flow, and other parameters of the heat exchange stations dispersed in different geographical locations in real time to control the heat transfer. The operation of each device in the station. At the same time, according to the operating parameters of the heat exchange stations monitored from the site, the operating conditions of the thermal power plant are adjusted to ensure the stable operation of the entire heating in winter.
The current thermal station operation management in China is still in the manual operation stage, which affects the full play of the superiority of centralized heating. Mainly reflected in: the lack of a comprehensive method of parameter measurement, can not be a systematic analysis of the operating conditions to determine; system operating conditions are difficult to eliminate the misalignment, resulting in uneven users hot and cold; heating parameters failed to operate in the best conditions, The supply of heat does not match the demand for heat. Operational data is incomplete and it is difficult to achieve quantitative management. In order to do a good job in the city's central heating projects, we must comprehensively improve the level of heating technology.
Second, the system program:
2.1, System Overview:
Urban heating pipe network wireless remote monitoring system from the front-end part to complete the monitoring of the monitoring factor content and summary, conversion, transmission and other work, monitoring factors, including temperature, pressure, flow, etc., these monitoring factors from the monitoring and control terminal using different methods Measured to obtain a very accurate measurement data, this result through the data processing conversion to the monitoring center through the GPRS network to transmit data, monitoring center to achieve data receiving, filtering, storage, processing, statistical analysis and provide real-time data query and other tasks, When the temperature or pressure exceeds the set value, the specified device is automatically turned on or off. The entire system can achieve: safe, reliable, accurate, real-time, comprehensive, fast and efficient display of real city heating pipe network information in front of managers.
2.2, system composition:
2.21, Data Management (Monitoring Center):
The hardware mainly includes: workstation computers, servers (telecom, mobile or Unicom fixed IP line or dynamic ip domain name mode);
The software mainly includes: operating system software, data center software, database software, heating pipe network remote intelligent monitoring system software platform (using B / S structure, can support browsing in the wide area network view), firewall software;
2.22, Data Transmission Layer (Data Communication Network):
Using the mobile company's GPRS network to transmit data, the system does not require wiring to be simple, fast, and stable.
The mobile wireless networking mode has characteristics such as high data transmission rate, wide signal coverage, strong real-time performance, high security, low operating cost, and low maintenance cost.
2.23, data acquisition layer (front-end hardware device):
Remote measurement and control complete equipment: monitoring and control terminal;
Sensing and metering equipment: pressure sensor, temperature sensor, flow meter, solenoid valve;
2.3. System topology:
Third, system function:
01, collection function:
Pipeline flow: instantaneous flow;
Pipeline flow: cumulative flow;
Pipeline pressure: pressure value;
Pipe temperature: temperature value;
02. Alarm function:
Power outage alarm, pressure, temperature, flow failure alarm, measurement and control terminal alarm;
State change alarm: The alarm status changes. If the pressure suddenly increases or decreases;
03, storage function:
Pressure, temperature, flow information, real-time data, event records, operation records are stored in the database;
04, query function:
Pressure, temperature, flow information, historical records, historical curves, event records, operational records, historical reports;
05, statistical functions:
Reporting function: daily, monthly, annual report;
Curve function: daily curve, monthly curve, annual curve;
06, print function:
Pressure, temperature, flow information, historical records, historical curves, event records, operational records, reports;
07, security features:
Password function: enter the system must enter the password;
Permissions function: Different operators have different functions;
User switching: Different operators can switch in the system when handover;
08, extended function:
Pressure, Temperature, Flow Quantity: Users can add or remove sites.
Remote control: output of remote control valve can be opened under the condition of adding electromagnetic valve;
09, set the function:
Site information entry, modification;
Acquisition cycle settings, modifications;
10, remote maintenance function:
Remotely set site (pressure, temperature, flow) operating parameters;
Fourth, the system features:
01. Practicality: Urban heating stations are geographically dispersed. Therefore, high signal coverage of a wide range of GPRS networks is used. High-gain antennas are necessary to ensure the normal operation of the network.
02. Real-time performance: Using the latest communication and hardware and software technologies, a clear and reasonable system architecture has been established to achieve multi-threaded remote concurrent communications. In a matter of seconds, hundreds of monitoring and control terminals can be transmitted in real time. Centralized monitoring and remote scheduling to the monitoring center, timely alarm of failure information;
03. Scalability: The system reserves the interface for infinite expansion of the system or software and hardware modules, which facilitates long-term upgrades and maintenance, extends the system's life span, and allows the system to survive until the entire system is updated. Hey, causing a lot of investment losses;
04ã€Easy maintenance: The system can execute corresponding remote operation commands to the measurement and control terminal, including remote parameter settings, remote control, remote data copying, remote terminal reset, and remote measurement and control terminal upgrade;
05, easy to operate: system software features complete, modular, graphical design, the entire process of Chinese help, simple and convenient operation;
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