PAS "Daugavpils siltumtīkli"

Daugavpils, Latvia
2010

Local boiler plant Kalkuni reconstructionimg_1894


Boiler plant reconstruction purpose was to change-over plant‘s fuel from heavy fuel oil (mazout) burning to biomass pellets burning (renewable, environment friendly fuel). It was installed 3 (three) new automatic water heating boilers with capacity 400 kW each, fully automatic fuel receiving, storage and supply to the boilers system, also other auxiliary equipment, including make-up water treatment plant, water supply and recirculation pumps, multicyclon, smoke fan, flue gases track and water pipelines, automatic control system. Boilers have fully automatic heating surfaces cleaning system by means of compressed air. The scope of the fulfilled reconstruction, commissioning and start-up works fully complied with the Contract. Works were fulfilled in very tight period (from the August till the middle of December) and in the end the boiler plant was switched to burn biomass. During commissioning and start-up all the boilers reached 110 % capacity. Installation of these new water heating boilers burning wood pellets reduced the costs of heat production: for 1 MW of produced heat fuel costs decreased for 70 %, electricity consumption decreased for 60 %.

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AB "Amber Grid"

Panevezys, Lithuania
2013

Water system equipment modernizationdscf4190


Technical-working Project implementation. Modernization of the process water cooling system. Execution of pre-commissioning, start-up and plant handover for commissioning.

 

 

 

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AB "Panevėžio energija"

Panevezys, Lithuania
2010

Supply of automatic vacuum deaeration systemdscf3600


Vacuum deaeration system capacity 37 m³/h
Nominal temperature of treated water before deaerator 75-80°С
Concentration of dissolved oxygen before deaerator > 8000 mkg/l
Concentration of dissolved oxygen after deaerator < 50 mkg/l

Chemically cleaned water with a temperature of 75-80°C goes to working nozzles of vacuum deaerator.

Vacuum deaerator may operate in three modes.

When deaerator works with load range up to 37m³/h feeding water goes to three deaeration nozzles. When deaerator works with load range up to 12m³/h feeding water goes to only one deaeration nozzle. The left nozzles can be activated or closed by the valve.

When the chemically cleaned water goes through the working nozzles it boils and then begins to discharge the dissolved corrosive gases (О2, СО2).

The pressure of vacuum deaerator is (-0,5÷-0,8) atm (by vacuum-gauge). Deaerating water flows after vacuum deaerator to hot well (volume is 5% of maximum rate during one hour V=2,5m³). Vacuum deaerators minimal installation height is 4 m above ground level.

Deaerating water goes from well to piping by gravity flow from the exhaustion side of the pump. The system is provided with two pumps, one working, another reserve; they are pumping the deaerating water to accumulator tank.

In accordance with pump output the water-level changes in a hot well. Level control works automatically by the frequency regulator and keep level on 20-30%.

To regulate the water-level in the deaerating tank as a primary device there is used pressure-difference transmitter.

Discharging corrosive gases are removed by the liquid-packed vacuum pump from deaerating column and deaerating tank to cold water tank. After vacuum pump discharge water and water mix with corrosive gases flow together to cold water tank, which is connected with atmosphere. The system has two pumps, one working, and another reserve. Cold process water with temperature 15-20°C is used as sealing water of vacuum pump. The cold water pumps from cold water tank, V=2 m³.

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Read more: AB "Panevėžio energija"