Effect of combustion air humidification on the operation of a biomass boiler – Theoretical analysis

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21220%2F25%3A00380622" target="_blank" >RIV/68407700:21220/25:00380622 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1016/j.heliyon.2025.e42299" target="_blank" >https://doi.org/10.1016/j.heliyon.2025.e42299</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.heliyon.2025.e42299" target="_blank" >10.1016/j.heliyon.2025.e42299</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Effect of combustion air humidification on the operation of a biomass boiler – Theoretical analysis

Popis výsledku v původním jazyce

The article describes the influence of additional installation of the combustion air humidifier for a biomass hot water boiler, which is equipped with a flue gas spray condenser, on its operating parameters and the heat supplied to the district heating system. Humidification of the air is carried out by spraying with water heated in the flue gas condenser, which is pre-cooled in the exchanger for preheating the return water from the district heating system. The case of the additional installation of the combustion air humidifier to the biomass hot water boiler JUSTSEN type JUE-FVB 7.2 with a heat output of 8 MW equipped with flue gas spray condenser is analyzed. Humidification and preheating of the combustion air leads to fuel savings and an increase in the dew point temperature of the flue gas, which improves the conditions for utilizing the waste heat from the flue gas in the condenser, as the heat is available at a higher temperature level. Humidification of the combustion air also affects the operating parameters of the boiler. In particular, the flue gas outlet temperature and flow rate increase and the efficiency of the boiler decreases slightly. Fuel consumption, however, decreases due to the heat input in the preheated and humidified combustion air. The application of the proposed solution would increase the heat supplied to the district heating system, by about 7 %–9 % of the boiler nominal heat output, depending on the heating of the air in the humidifier. A summer drop in biomass moisture would be reflected in a reduction in the energy benefit of the flue gas condenser by more than 20 %. However, humidification of the combustion air can limit this negative effect.

Název v anglickém jazyce

Effect of combustion air humidification on the operation of a biomass boiler – Theoretical analysis

Popis výsledku anglicky

The article describes the influence of additional installation of the combustion air humidifier for a biomass hot water boiler, which is equipped with a flue gas spray condenser, on its operating parameters and the heat supplied to the district heating system. Humidification of the air is carried out by spraying with water heated in the flue gas condenser, which is pre-cooled in the exchanger for preheating the return water from the district heating system. The case of the additional installation of the combustion air humidifier to the biomass hot water boiler JUSTSEN type JUE-FVB 7.2 with a heat output of 8 MW equipped with flue gas spray condenser is analyzed. Humidification and preheating of the combustion air leads to fuel savings and an increase in the dew point temperature of the flue gas, which improves the conditions for utilizing the waste heat from the flue gas in the condenser, as the heat is available at a higher temperature level. Humidification of the combustion air also affects the operating parameters of the boiler. In particular, the flue gas outlet temperature and flow rate increase and the efficiency of the boiler decreases slightly. Fuel consumption, however, decreases due to the heat input in the preheated and humidified combustion air. The application of the proposed solution would increase the heat supplied to the district heating system, by about 7 %–9 % of the boiler nominal heat output, depending on the heating of the air in the humidifier. A summer drop in biomass moisture would be reflected in a reduction in the energy benefit of the flue gas condenser by more than 20 %. However, humidification of the combustion air can limit this negative effect.

Druh

J_SC - Článek v periodiku v databázi SCOPUS

CEP obor

—

OECD FORD obor

20301 - Mechanical engineering

Projekt

<a href="/cs/project/TK04030297" target="_blank" >TK04030297: Využití kondenzačního tepla ze spalin kotlů na biomasu</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2025

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Heliyon

ISSN

2405-8440

e-ISSN

2405-8440

Svazek periodika

11

Číslo periodika v rámci svazku

3

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

15

Strana od-do

—

Kód UT WoS článku

—

EID výsledku v databázi Scopus

2-s2.0-85216273030