The high-temperature water heating station was built in 1994 and was put into operation by the end of the year. Mainly provide production heat for FAW-Volkswagen and various production units in the second plant area. The heat source is 1.0Mpa superheated steam in thermal power plant. In 96 years, as the demand of users increases, the high-temperature water system is increased in capacity and the heating equipment is powered by the power station. Moving out of the steam turbine workshop, a new high-temperature water station was built outside the western wall of the steam turbine workshop. At the end of 1996, capacity expansion was completed. In 1999 it reached 39.75GJ. The high-temperature water system renovation project was a key technical transformation project of FAW Group in 2000. Tsinghua Tongfang analyzed the system and proposed to renovate the steam heating system in the original first station on the one hand, and replace the hybrid heat exchanger with a surface heat exchanger. The constant pressure method adopts the frequency conversion and speed regulation of the supplement water pump, and the frequency and the main circulation quantity are also adjusted by frequency conversion. The corresponding control equipment is added to ensure the safe operation within the station; additional control systems are set up for each heat user, and automatic adjustment is performed according to the load of the heat consumers; Communication, coordinated control of the whole network; the control system adopts RH2000 distributed control management system newly developed by Tsinghua Tongfang, which can meet the purpose of the system to ensure the safe, reliable and economical operation of the system.

High temperature water automatic control system includes:


It automatically detects the pressure, temperature and flow rate of two steams on the primary side of the heat exchanger.
Automatic detection of outdoor temperature.
Automatic detection of the high temperature water supply temperature of the backlog heat exchanger.
Automatic detection of high temperature water supply, return flow, temperature and pressure.
Automatic detection of heat exchanger internal level status.
According to the temperature of the high temperature water supply side of the heat exchanger, the steam is automatically controlled to enter the opening of each heat exchanger inlet regulating valve.
Automatically detect the inlet and outlet temperature and pressure of the hydrophobic cooler, and automatically control the opening of the electric butterfly valve on the secondary side of the water cooler according to the outlet temperature to prevent the hydrophobic pressure and automatically control the speed of the hydrophobic pump.
Automatically detects the operating status of the hydrophobic pump and automatically controls the speed of the hydrophobic pump according to the hydrophobic pressure.
Automatically detect the running state of the circulating pump, and automatically control the speed of the main circulation pump according to the end user, that is, the inlet pressure and pressure difference of the inlet of FAW-Volkswagen, so as to ensure the self-use indenter of FAW-Volkswagen.
According to the constant pressure point, the pump speed is automatically controlled.
Fault diagnosis and alarm (according to the parameter information, diagnose faults of each system in time and guide maintenance).

The function completed by this automation system:


Formulate system management, scheduling, operation and control strategies;
Access to data and control parameters;
Management, scheduling, monitoring and control system operation;
Display system operating data, images and curves;
Print all kinds of reports;
Perform system operation history and trend analysis;

The project started in October 2000 and was fully put into use in July 2001. The temperature difference between the water supply and the return water increased to 40 degrees, the water return pressure was stable, and the energy saving effect was significant. The original design goal was basically achieved, and it was well received by users.