Projects

Liepaja

The current priject has been implemented in the Southern Heating Boiler House of Liepaja city, Latvia. There was a new hot water boiler KVG-20, capacity 20 MW, installed in the existing boiler house. The boiler was equipped with one burner, an air supply ventilator, a smoke exhauster as well as a recirculation pump and a cold start bypass valve. Water system of the boiler was connected to the already existing water system of the boiler house including three water pumps.
The aim of this project has been a completely automated equipment of the new hot-water boiler, creation of visualization system allowing operators to monitor the boiler’s operating parameters as well as startup, stoppage and change of operational characteristics. Besides, the automatic control system should operate two network water pumps functioning in the boiler house.
As the main object of this automation project has been the boiler operating with a potentially dangerous substance, i.e., gas, than the highest attention had been paid to the operational safety. For this purpose a special equipment has been used in this project in order to control the boiler burner and track the safety level of parameters and a correct sequence of operations at startup, as well as an indication of the presence of flame has been added. Besides all the features mentioned above a fail-safe controller has been introduced designed to operating according to the highest security demands.
The created system of automation allows activation of the boiler by a mere push of a button, which provides an automatic sequence of all further actions. When the boiler is started, an operator just needs to assign definite capacity settings at the moment and accordingly all modes  available for the particular capacity are supported by the system. Information concerning all possible damages or emergencies is forwarded to an operator and emergency data history is available for inspection. The most important parameters of the system operation are represented on the monitor not only as graphic schemes but also as diagrams, thus allowing to compare the changes of parameters in time and track definite tendencies. In case of a necessity to stop the operation of the boiler, an operator should just press a button and confirm a stop command after which follows an automatic reduction of capacity and a complete stop.
Due to a complete automatic control of utilized amount of combustible and air, there is a substantial reduction of pollution from the boiler into the atmosphere. That allows to adjust the correlation of air and fuel according to the needs.
Adjustment by the help of visualisation system is valid for PID control of ventilator, smoke exhauster, pumps and the diverter valve, although only qualified engineering staff has an access to this kind of data including air and fuel settings as well.
During the development process of this project a need for some data reading of few devices arouse. Such devices as the gas meter and the heat meter were located in hardly accessible places that made the parameter control rather difficult to read off. Acquisition of information from both meters was solved by different protocols which were able to provide the required data to operators in the common system of visualisation.
After accomplishment of the project all the staff of the Boiler House has been trained to work with the new system, acquainted with its main functioning principles and safety operational rules.
This project has been carried out on the basis of Siemens  Simatic S7-300-F controller, including Siemens Simatic Multi Panel Touch graphic panel and an equipment for burners DURAG Group in the year 2008-2009.