Dispatching and monitoring system of weihuliang he

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Weihuliang heat dispatching monitoring system

[Abstract] this paper introduces the weihuliang heat dispatching monitoring system, which is composed of PCC programmable computer controller and computer workstation. For the whole heat plant, the outlet temperature and circulating flow of the heat source plant are regulated by sections according to the outdoor temperature. The comprehensive function f and smart PID are used to control the secondary water temperature and circulating flow of the heat exchange station, so as to realize the control of the secondary heat supply

Jiang Feng 1 yuan Jun 1 Yang Jianyu 2

(1. Urumqi Thermal Power Corporation, Urumqi 830002; 2. Xiyi Tianzheng Automatic Control Engineering Co., Ltd., Xi'an 710068)

weihuliang power plant is a medium temperature and medium voltage power plant built with the assistance of the Soviet Union during the first Five-Year Plan in China, which was rebuilt into a thermal power plant in 1994. In 2000, the heat supply was expanded. It is planned to build 43 heat stations directly through thermal oxygen degradation. A total of 13 heat stations will be built in phase I. the heat source of heat supply will be jointly undertaken by the power plant and the peak shaving boiler. A SCADA computer dispatching and monitoring system composed of PCC programmable computer control system and HP workstation will be adopted

1 composition of microcomputer monitoring and dispatching system

weihuliang thermal microcomputer monitoring and dispatching system is shown in Figure 1-1, which is composed of SCC monitoring center and local control stations of 43 LCM thermal power stations. SCC includes HP network server, operator station, engineer station and communication front-end machine, and uses Ethernet to form a local area. Each heating station adopts Austrian B & RPCC programmable computer controller for local control, and forms a regional decentralized local area through the municipal public network. The system is designed with full consideration of openness (standardized bus, real-time multi task system and high-level language), scalability (hardware and software modular structure) and Maintainability (hot plug hardware and update debugging program)

2 functions of microcomputer monitoring system

2.1 SCC of sub control center controls the main circulating pump according to the pressure difference and temperature signals of each thermal power station; According to the outdoor temperature, the temperature of the heat exchanger in each thermal station is set to ensure that the indoor temperature of thermal users meets the specified requirements. The computer network of SCC is based on the structure of "client server". The server operates continuously, mainly to complete data reception, processing and instruction release, and timely respond to the service requests from the client of pc/abs alloy plastic rich automotive interior materials

the workstation of the monitoring center is used for data management, storage and calculation, and manages the computer system. The operator station is used to monitor and manage the whole thermal system and provide man-machine interface for operators. The engineer station is mainly used for system simulation, working condition calculation, control parameter calculation, fault analysis and diagnosis, and pipe plugging and leakage analysis, and reports the analysis and calculation results to the injured person station to prompt the operator for correct operation and judgment. The projector is used to display the operating parameters and pictures, making the thermal process flow and parameter display more intuitive

after using the microcomputer monitoring and dispatching system, each heat exchange station is unattended. The monitoring center has a special person on duty for 24 hours to monitor the operation status of each heat station. The monitoring center exchanges data with each heat station through a modem (mo-dem), collects the operation data of each heat station in time, and stores, analyzes and prints the data. The monitoring center optimizes the dispatching according to the operating industries and mines. In a period of time, when the main heat source can not meet the needs of users, the monitoring center will distribute the heat required by each heating station and determine the operation mode, balance the total heating demand, and ensure the safe, reasonable and economic operation of the heating system in the area. The operation station is the key link of man-machine dialogue. With its highly reliable hardware and excellent software, it provides the possibility to optimize the process operation and avoid misoperation

realize the following functions:

* data collection: collect data at each monitoring point according to the inspection method specified by the operator or the system default

* system configuration: set the type, quantity, parameter name, limit value and other contents of LCM measurement and control parameters in the system

* display: overall display of the system, dynamic display of main measuring point parameters, detailed process flow and status parameter display of specified measuring points

* print: daily, monthly, annual and time period reports of all parameters specified by each station, and system operation status table

* data management: various data are stored in various databases according to types, and the data are queried, retrieved, counted, tabulated and drawn

* alarm and fault handling: when the alarm signal is displayed, marked, printed and the parameter exceeds the limit, it shall be recorded in the database

* data communication: sending data and sending control instructions, receiving data and receiving control instructions, error correction and detection

2.2 local monitoring station lcm

the LCM local monitoring station composed of the programmable controller PCC is shown in Figure 2-1. It is responsible for independently completing the collection, monitoring and automatic control of the operation parameters of the heating community, meeting the heating demand of the community through automatic adjustment, receiving SCC instructions and transmitting relevant data upward. Under normal operation conditions, each heating station automatically forms a system according to the strength limit of low carbon steel and the cross-sectional area of the test piece, Even if the monitoring center or communication fails, the PCC of each thermal power station can still operate normally and automatically adjust according to the preset parameters of SCC station. When the main heat source is insufficient, SCC sends the proportional parameter of limiting heat to each thermal power station. Each thermal power station automatically adjusts the parameter to achieve the thermal balance of the whole pipe. When the outdoor temperature is less than -10 ℃, the main heat source is seriously insufficient, The indoor water temperature can no longer meet the design requirements. At this time, the monitoring center will notify to start the combined operation of peak shaving boiler. Complete the following control

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