Heat recovery from flue gas which results in increased fuel to heat efficiency of the biomass boiler plant (approx. 8 - 12 %)
Environmentally friendly investment
EU funds supported
Reduces the cost of energy
Suitable for new construction or retrofit applications
Klaipėdos Energija biomass boiler plant energy efficiency solutions
- Hot process fluid (water or steam) at a temperature of at least 110 °C, in some cases up to 80 °C, such as hot boiler water or steam.
- Warm process water up to 50 °C, for example, return district heating water.
IMPORTANT: the technology must contain a medium with a low temperature energy potential, such as flue gas.
Second stage condensing economizer
The absorption heat pump consists of an evaporator, an absorber, a condenser, a generator, a solution heat exchanger, an absorber heat exchanger, a coolant/solution pump, a purge pump and control equipment. The operation of the absorption heat pump is initiated by starting to supply a high temperature fluid (e.g., heating water from the boiler or steam) to the generator circuit. At that time, the thermal energy of the low-temperature condensate accumulated in the evaporator circuit, in the second stage flue gas condensing economizer, is used to evaporate the operating fluid. The total thermal energy supplied from the generator circuit and obtained in the evaporator circuit is transferred to the heating water or other process fluid in the absorber and condenser circuits.
For the cooling process to take place continuously, the generated steam in the evaporator circuit must be removed. A solution of lithium bromide in the absorber circuit is used to absorb these liquid vapours. During this process, lithium bromide is diluted, resulting in a decrease in its absorption capacity. The pumps transfer this solution to a generator in which the hot water/steam flowing in the circuit heats the diluted lithium bromide solution and reaches the boiling point. The boiling of the coolant increases the concentration of lithium bromide. The coolant vapour emitted on the generator circuit side enters the condenser where it returns to the liquid state when cooled. The coolant returns to the evaporator and begins a new cycle.