First, in introducing the current thermal station operation management of my country is still in the manual operation stage, affecting the full playback of centralized heating superiority. Mainly reflected in: lack of comprehensive parameter measurement means, unable to systematically analyze the operating conditions; it is difficult to eliminate system operating conditions disorders, resulting in uniform user cold and cold; heating parameters fail to operate under the best conditions, The heat transfer does not match the heat required; the operation data is not full, it is difficult to realize the management. Do a good job in urban central heating projects, we must improve the level of heating technology. First, we must improve the level of automation control of the heating system, and the other is to improve the management level of the heating industry. Automatic control in heating engineering is very important for ensuring high quality heating, safe operation, economic energy saving and environmental protection of heating systems.
Second, the composition structure
Third, the main technical principle: 1. GPRS Data Communication Technology Overview GPRS is a general packet wireless service (General Packet Radio Service), which is a new bearer service developed on the existing GSM system, with a packet-group data service for GSM users. GPRS uses the same wireless modulation standard, the same frequency band, the same burst structure, the same frequency band, the same TDMA frame structure, the same frequency band, the same TDMA frame structure, this new packet data channel is extremely similar to the voice traffic channel exchanged by the current circuit. . Therefore, the existing base station subsystem (BSS) provides a comprehensive GPRS overlay from the beginning. GPRS allows users to send and receive data in end-to-end packet transfer mode without the need to utilize network resources of circuit switched modes. This provides an efficient and low-cost wireless packet data service. It is especially suitable for interrupt, burst and frequent, small amounts of data transmission, but also for occasional large data volume transmission. GPRS Theory bandwidth can reach 171.2kbit / s, the actual application bandwidth is approximately 40 ~ 100kbit / s, which provides TCP / IP connections on this channel, which can be used for Internet connection, data transmission and other applications. GPRS is a new mobile data communication service that provides a connection between mobile users and data networks, providing a high-speed wireless IP or X.25 service to mobile users. GPRS uses grouping exchange techniques, each user can occupy multiple wireless channels simultaneously, and the same wireless channel can be shared by multiple users. The resources are valid, and the data transfer rate is as high as 160kbps. Use GPRS technology to implement data packets to send and receive, users will always reducing service costs in line and press traffic. Common networking structures are as follows:
2. Power Control Configuration Software: * Powerful web features and Internet / Intranet browser technology, directly support multi-document. The WWW feature is implemented with VC , so there is a better real-time when the monitoring screen is remotely accessed on the Internet. At the same time, it is easy to use the rapid development tool such as ASP to build the B / S system structure and can directly access the single window. * Domestic leading network architecture, support B / S and C / S access methods, support multi-level network redundancy and failover. Provide multiple redundant structures, support IO equipment redundancy, network redundancy, database redundancy, etc .; full support for radio, dialing (wheel tuft), wireless Ethernet, GPRS, CDMA, and GSM SMS, the remote data is collected and Alarm; * The first GPRS DTU product in China is interconnected with control equipment such as PLC, instrument, and module, etc., and can connect multiple different manufacturers to the GPRS terminals and control devices can be remotely communicated; GSM mobile phone SMS alarm management system facilitates management alarm information; * Applicable to various pipe networks (such as hot, water, electricity, oil, gas, etc.), mines, hydrology, transportation, environmental protection and other systems for remote monitoring
4. System function detail data acquisition and processing function collects the running data of each heat exchange station into the scheduling station through wireless mode (GPRS), and is displayed, calculated, and processing on the scheduling station. The screen display function main screen displays a dry line dynamic process flow chart of the entire main network. The flow diagram is marked with the actual position of each heat exchange station, and the main parameters of the heat exchange station are displayed. Data from the transfer station transfer can also be displayed in the form of a table or a rod. You can switch to any heat exchanger through the button to view the details of the heat transfer station. Equipment Alarm Features When the device of the heat transfer station runs a malfunction, the fault information is automatically transferred to the dispatch station, promptly reminding the operator. The CRT screen displays the fault area flowchart, the accident device graphics discoloration. The alarm window will pop up the alarm information, report the alarm type, time, alarm value, whether to restore information. The alarm system issued a sound report accident.
The communication self-diagnosis function displays the communication station number, communication rate, communication port information on the screen. When the communication is faulty and a refillstion station, the information prompt will appear.
The management function can operate heat transfer efficiency, one or two network loss rates, heat balance relationships.
Historical Data Query The total scheduling station puts the data from each heat exchange station into the historical database, and can query the running data of a certain period of time by querying the historical data curve.
The report print function is summarized and classified by the heat transfer station. The printer of the scheduled station can output these data to form daily reports, monthly reports, and real-time reports.
The duty personnel of the production scheduling function scheduling station can down to the operator down to the operator down according to the actual health of the heat exchange station.
V. System Control Principle 1. Data Center: The data center uses the ADSL way to connect with the Intelnet public network, and the iP or domain name is fixed with public network. This solution needs to apply for ADSL and other broadband services at the Internet operator. Among them, the data center uses a public network fixed IP, and the monitoring points are directly connected to the center, run relatively reliable, stable. The basic structure of the computer monitoring system is shown in the main figure. Measurement sensors (temperature, pressure, liquid level, flow, etc.) detect the controlled object, convert the controlled amount into a unified electrical signal, converted into a digital signal delivery process controller by mold / digital converter ( Indes for industrial control or PLC. The computer compares this measurement with a given value, generates a control command, generates a control command, and converts the digital signal into an electrical signal, and controls the predetermined control target by executing the actual mechanism. The data of the heat exchange station exchanges data through the GPRS DTU and the data center scheduling station. Computer monitoring system as a supervision, management system, in addition to displaying, record, printing, and alarm functions, it is also possible to optimize the water supply temperature to direct direct control systems to automatically adjust the given value. Thus so that the heating process is in the optimal state. 2. Heating station: Each heat exchange station passes the control software of the data center to the data center by the PLC controller to heat the heat, pressure, flow, heat, etc., directly transmitting data directly to the power control software of the data center; the data center will receive After the data processing is processed, the processing result is sent to each heat transfer station with the control command, and truly reaches the unattended.
In all self-control systems, the wired network is the most common network, but for the hot network system, it is very difficult to lay a communication cable because of more in the urban area, and far from the distance.
Six, summary 1. Improve the work efficiency and accuracy of heating charges, ensuring high efficiency and stable operation of the fee. Increased engineering design levels and technical file management level, all of the basic data of the company's thermodynamic facilities are managed by the geographic information system, so that all the technical staff of the company can check the basic data of the company's thermodynamic facilities on the office network. It is convenient for heating. Run 3. Improve the horizontal level of thermal network operation, improve the quality of heating service, after the hot network is automatically run, the return water temperature of the secondary pipe network of the heat exchange station is always running within the specified range, and the hot network automatically runs quickly tracks outdoor temperature. When the outdoor temperature changes, the secondary pipe network is also followed by changes, ensuring that the indoor temperature of the heating user has always been balanced, avoiding the thermal network temperature lag, greatly improves the quality of heating service. At the same time, it reduces the heat of heat when the temperature is high during the day, so that a large amount of heat and power can be saved, reducing the operating cost of hot network. 4. Remote access, remote control. As shown in the main figure, the heating company's dispatcher, through the Login Internet (wireless or wired), enter the power control server of the data center. After obtaining permissions, you can adjust the heat network operation parameters at any time. You can improve the heating operation parameters in holidays, ensuring the user's indoor temperature, got the user's praise, and established a good corporate image for the enthusiasm. The above is designed and implemented by Harbin Tianxiang. This system has enhanced and promoted the efficiency and management level of the entire heating company, improves the quality of heating service, saving a large amount of heat and electricity for heating companies. Good economic benefits.
