This project was implemented in the Boiler House “Ziepniekkalns”, Riga, Latvia. The current boiler complex consists of two water boilers KVGM-50 and two steam boilers.

One of the water boilers was modernized in order to reduce the level of pollution to correspond the requirements of EU. In the process of modernization old burners were removed and substituted with two new ones, maximum capacity 20 MW per each, including all necessary sensors and adapters and adjusters of the automatic mode.

The natural gas was chosen as the main kind of combustible of the modernized boiler, however,  in case of any delivery irregularity, burners can be operated by oil-fuel as well. In such case an ignition of the boiler can be done with a compressed natural gas  and a set of gas cylinders.

The task of our company was to set up an automation system of the modernized boiler and its support equipment. A special attention was paid to the safety and failure tolerance of the operation process.

The established system of automation can operate the equipment of the Boiler House automatically in any operation mode (boiler’s workload can be easily adjusted in the limits of 5-100%), including turning ON/OFF, at the same time providing all necessary technological parameters within  adjusted limits and failure tolerance of the boiler.

Vizualisation system as a part of the whole automation complex was made on the basis of software Siemens WinCC and enables the Boiler House operators to control the process via the PC. The basic data of system’s parameters are archivated enabling a possibility of their output on monitors or printers graphically or in tables.

In order to provide security functions in highly important monitoring and control circuits, special input/output modules were used with a built-in functions of control of adapters and service equipment.

A standby server was installed for a further reliability of the system intended to monitor, control, data collection and storage apart from the host server. Therefore, even in the case of the principal server’s failure, the system automatically would be directed to standby srever, thus providing a continuous access of operators to the control system.

In case of a total failure of the main vizualisation system a backup equipment was provided based on graphic panel with a separate and independent communication channel to the controller, providing all functions of monitoring and control.

As one of the tasks of automation system was an immediate informing to the supervisor of the company concerning operation process of the Boiler House, a data transmission to the central server of customer’s company was established using OPC protocol.

This project was implemented in the year 2008-2009, based on Siemens Simatic S7-300 controller, vizualisation system Siemens Simatic WinCC, graphic control panel Siemens Simatic Multi Panel Touch and burners operation equipment by DURAG group.

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