The AGB-06(P)/3AH industrial hot water boiler plant model ensures heat production at a low cost and is eco-friendly. The fuel used in the boiler plant is biomass, i.e., wood chips and shredded wood waste. Fuels with moisture content up to 55% can be used. This boiler plant model consists of two main parts: a one-way furnace and a three-way horizontal boiler situated above the furnace.
The boiler plant is made of high-quality metal sheet and seamless round pipes from reliable manufacturers. The furnace is made of welded steel carcass, which is lined with refractory bricks from the inside and is equipped with an air preheating system. The boiler plant is covered with mechanically resistant coating. The fuel is burned in a hydraulically operated alloy cast iron grate (chromium content at least 28%). The ash is removed from the furnace by a hydraulic ash pusher. The furnace is equipped with primary, secondary, and tertiary air supply systems including air preheating function.
The fuel on the surface of the movable grate is pushed into the back part of the furnace by the hydraulic pusher (of the AGB UHV type), where it dries and begins to gasify. The movable grate mechanism distributes the fuel throughout the grate area, forming a proper surface for burning. The ashes from the space above and below the grate are pushed by a hydraulic scraper into the outer ash mechanism. Afterwards the ashes are transported to the ash collection container. The furnace is equipped with two pressuriser air fans (of the AGB GP type) with an automatic control system (ACS), which facilitates the fuel burning efficiency.
Burning quality control
The burning process quality control is possible due to the signal transmitters (stack effect, remaining oxygen content (lambda), air mass, temperature, etc.) installed in both the furnace and in the boiler as well as thanks to the automatic control system (ACS), which controls the operation of all mechanism actuators, including smoke pump, pressuriser fan, fuel supply, movement of grate, removal of ashes, etc. Depending on the type of fuel used, especially if it noticeably differs in quality, it is possible to save and load different configurations. This type of boiler unit allows for constant smooth operation and ensures cost-effectiveness and quality of fuel burning.
Quality control of the burning process
The quality control of the burning process is possible due to the installed signal transmitters which can process all of the relevant measurements such as lambda, air mass, temperature, etc. They are installed in both – the furnace and boiler. Also, the automatic control system (ACS) is installed in the boiler plant which then controls all of the actuator mechanisms, smoke pumps, pressuriser fan, fuel supply, grate movement, etc. Furthermore, it is possible to save and load different configurations in the console if there is a noticeable quality difference in the fuel used. This kind of boiler plant ensures constant and error-free operations which is a very cost-effective method whilst maximizing the quality of fuel burning process.
Heat carrier transport
A heat carrier is applied to certain areas in order to protect the most important parts of the furnace from overheating (the outermost ends of the furnace) and to maximise the energy conversion efficiency. The backflow of the heat carrier from the heat utilisation equipment is directed towards certain parts of the furnace, after which it flows through the lower part of the boiler to the convective part of the boiler, thus being applied to all of the thermally stressed surfaces. The flow of the heat carrier to the heat utilisation equipment occurs in the upper part of the convection boiler.
Exhaust gas
Exhaust products of thefurnace are conducted from the upper part of the boiler, through outer piping into the flue gas purifier – multicyclone (of the AGB MC type). After purification the gas is directed to the chimney stack by the flue gas fan (of the AGB DS type). Hot products of the fuel combustion flowing through the fire tubes of the boiler, deposit their heat energy into the heat carrier, for example, water.Flue gases are cooled from ~1000 ºC down to 140–160 ºC in the AGB-06(P)/3AH boiler plant. If necessary, then other flue gas systems can be installed in accordance with customers’ requirements, for example, an additional cooler/incoming air preheater.
The flow of flue gases
The flue gases flow to the upper part of the hot water boiler and through the outer flue to the flue gas purifier – the multicyclone (of the AGB MC type) and lastly the gas is pushed out into the flue gas stack by the flue gas fan (AGB DS type). When the flue gases flow through the fire tubes of the boiler, energy which is derived from the heat is then absorbed by the heat carrier which can be applied to heat the water.
The technical solution of the heating system allows for accessible and convenient cleaning, ensuring the economical and effective functioning throughout the period of operation. The front door of the boiler is used for cleaning the boiler and the back door for ash removal.
In order to keep the boiler room clean when cleaning the boiler plant a special collector for the removed ash and soot has been installed near the boiler doors, so that the removed substance could be disposed. The airshot fire tube pneumatic cleaning system has been installed additionally in order to extend the interval between the shutdown of the device and cleaning. This system sends blasts of air in the fire tube zones at specified intervals of time, which causes the ash particles to separate from the fire tube surface and be carried into the multicyclone with the stream of flue gas. The airshot system greatly increases the cost-effectiveness and efficiency of the boiler plant.
Boiler plant | Nominal power/kW | Minimum power/kW | Type of fuel | Fuel moisture content, %* | Volume, l | Type | Operating pressure, bar | Test pressure, bar | Mounting position | Working temperature of the furnace | Minimum return temperature | Furnace operating temp., °C | Max temp. of the furnace, °C | Boundary strength class of bricks, °C | Heat carrier supply and return connection dimensions, DN | Efficiency, % | Flue connection DN, mm | Type of the furnace | Ash collection and discharge |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
AGB 500kW-06(P)/3AH | 500 | 75 | Wood chips | 55 | 1800 | Firetube A three-way horizontal boiler | Up to 6.0 | 9.0 | Horizontal Above the furnace | 110°C | 65°C | 650-950 | 1200 | 1600 | 80 | Up to 87 | 300 | One-way/Moving grates | Included |
AGB 800kW-06(P)/3AH | 800 | 120 | Wood chips | 55 | 2400 | Firetube A three-way horizontal boiler | Up to 6.0 | 9.0 | Horizontal Above the furnace | 110°C | 65°C | 650-950 | 1200 | 1600 | 80 | Up to 87 | 400 | One-way/Moving grates | Included |
AGB 1.0MW-06(P)/3AH | 1000 | 150 | Wood chips | 55 | 3000 | Firetube A three-way horizontal boiler | Up to 6.0 | 9.0 | Horizontal Above the furnace | 110°C | 65°C | 650-950 | 1200 | 1600 | 100 | Up to 87 | 450 | One-way/Moving grates | Included |
AGB 1.5MW-06(P)/3AH | 1500 | 225 | Wood chips | 55 | 3800 | Firetube A three-way horizontal boiler | Up to 6.0 | 9.0 | Horizontal Above the furnace | 110°C | 65°C | 650-950 | 1200 | 1600 | 125 | Up to 87 | 500 | One-way/Moving grates | Included |
AGB 2.0MW-06(P)/3AH | 2000 | 300 | Wood chips | 55 | 4800 | Firetube A three-way horizontal boiler | Up to 6.0 | 9.0 | Horizontal Above the furnace | 110°C | 65°C | 650-950 | 1200 | 1600 | 125 | Up to 87 | 550 | One-way/Moving grates | Included |
AGB 2.5MW-06(P)/3AH | 2500 | 375 | Wood chips | 55 | 4800 | Firetube A three-way horizontal boiler | Up to 6.0 | 9.0 | Horizontal Above the furnace | 110°C | 65°C | 650-950 | 1200 | 1600 | 150 | Up to 87 | 600 | One-way/Moving grates | Included |
AGB 3.0MW-06(P)/3AH | 3000 | 450 | Wood chips | 55 | 4800 | Firetube A three-way horizontal boiler | Up to 6.0 | 9.0 | Horizontal Above the furnace | 110°C | 65°C | 650-950 | 1200 | 1600 | 200 | Up to 87 | 600 | One-way/Moving grates | Included |
SIA “AGB Serviss”
Registration number: 48503009453
Company address:
Kuldīgas šoseja 6, Saldus pagasts, Saldus novads, Latvija. LV-3862
Bank:
A/S Swedbank,
HABALV22, account: LV18HABA0551005193364
A/S SEB Bank,
UNLALV2X, account: LV94UNLA0050003181147