Raw straw biomass furnace

Energetics | Raw straw biomass furnace


Our company is a manufacturer of systems for burning straw, with the financial support of institutions for making hot water from agricultural waste. The straw can be used as a substitute for other fuels, in particular fossil fuels (natural gas, fuel oil or coal, etc). In this case, in addition to the effects of environmental protection in terms of reducing the production of carbon dioxide and achieved economic effects can be seen in a low biomass cost compared to fuel prices.


The use of boilers for combustion of straw:

  • Public institutions for the production of heating and hot water heating;
  • Agriculture - Agricultural farms
  • Industry - the technological processes and water heating, etc.


Basic parameters of straw biomass boilers:

Type of boiler

















We can make all kinds of boilers within power range from 400kW to 5000KW









Operating Pressure

0.3 – 0.6 MPa

Outlet water temperature

90 – 110 °C

Inlet temper.

60 °C

Fuel  consumption

115 kg/h

180 kg/h

285 kg/h

456 kg/h

713 kg/h



Features of used biomass

The optimum amount of humidity around 18%, with a special adjustment max. to 22% form - straw bale length 2.5m, height 0.6 to 1.2 meters and width of 1.2m; calorific value of the biomass at 15% moisture content is 14 to 15 GJ/t

Emission rate

In accordance with the law ČZ 146/2007. Sb. Biomass corresponding of set of future emission values from 2016. The limit values of SO2 - 160mg/Nm3; NOx - 200mg/Nm3, other particles TZL - 30 mg/Nm3


 Image, conceptual design stoves straw: 1 – Conditioner in fuel tank; 2 - Device for cutting and dispersing; 3 - Conditioner for chipped fuel - straw; 4 - Fire place and combustion; 5 - A system for automatic ash removal (ASH system hydraulic ash removal from combustible structures); 6 - Flue gas removal;


Fuel consumption - fuel system implementation allows the furnace supplied with baled straw bales, separate from the chamber where the combustion. Implementation of fuel is done through ramp boiler. Continuously variable has a positive impact on the maximum use of the energy potential of the fuel (efficiency of the combustion process) and the resulting minimal emissions and ash that remains after combustion, which can be used as organic fertilizer,


Boiler - integral design without ceramic pieces, double wall, water cooled. It consists of parts that are under pressure, including a fireplace, large chambers for post-combustion and fire control, tube heat exchangers and air vents for flue gases. The pressure of the boiler, which controls the operation of the cyclone, which is positioned on the steel frame is equipped with sensors to measure the pressure and was accompanied by a corresponding holes that open and close and build a good thermal insulation. Special materials and hydraulic cleaning system prevents the adhesion of molten ash on the inner surfaces of the device and the burning vibrating grid. The structural design of the furnace provides better thermal insulation and prevents excessive clogging ash on the walls of the oven.


Removing ash - ash after combustion of the fuel in the chamber to the hydraulic system in the Afterburner chamber and paddle screw conveyor system leads to a container for ashes. Anticipated amount of ash depends on the quantity and quality of biomass burned and can range up to a maximum of 8% of the total burnt fuel.


Regulation of flue gases - emission control exhaust fan shall be controlled frequency converter, which depends on the pressure in the combustion chamber. The elimination of the flue gases is provided by multi-cyclone separation system according to the specific weight of the particles. This may be an additional system as well as an additional step for the filtration, thus eliminating the occurrence of a sudden expansion of the smoke. The collected ash from the bottom of the furnace is automatically transferred into the container through the double conditioner with regulators.


Automatic control system - technology management is carried out as an integrated system, to improve the fuel economy of use, and to better control the boiler for combustion with the air, and the regulation of emissions, and the process of collecting the ashes. Monitoring and automatic control of the process control processor (Siemens PLC) for optimum combustion, the required performance and ensure all operational and emergency functions for safe and long-lasting operation.


Fuel - which can be used (agriculture straw)

  • The recommended moisture biomass below 18%
  • Technical adjustments can be achieved by burning the moisture content to about 22% of the fuel
  • Straw bale shape with a width of 1.2 m, a height of 0.6 to 1.2 m, length of 2.6 m, with the possibility of adjustment depending on the baling system and method for collecting


The main advantages of straw as fuel:

  • Renewable, local energy source
  • Low cost of fuel with high calorific value of 13.2 to 14.9 GJ/t
  • Does not increase the proportion of gases damaging greenhouse emissions gases showed low levels of heavy metals, sulfur, and other
  • Practical use of raw materials that can not be used, even careless use of environmentally friendly,
  • Reduction of energy imports in the region and the use of local labor to obtain an efficient process combustion


Benefits of Technology boiler ST series - compared to the standard equipment type, or equipment for the combustion space is equipped with a ceramic coating, which provides many benefits:

  • Minimizing the number of components to quickly carry materials, particularly related to coating and construction bars
  • Easy replacement of worn parts, which are exposed to high dynamic performance and a high degree of flexibility to change the power output and the obtained output performance
  • High availability of different financing methods boiler enables fast start-up from cold conditions without Risk of damage to, and any other effect on shortening the operational period of the boiler.


Allows quick power reduction or complete cessation of rapid operation of the boiler without the risk of overheating. Boilers ST series meet the most demanding requirements for protection of the environment and in terms of the forthcoming levels of greenhouse gas emissions and a very favorable economic solution for the production of thermal energy.


Reference building biomass boiler:

Name and location of the project


Type of fuel


Central heating in Great Karlovu

1.2 MWt

Wood chips


Biomass boiler in Brno

2.6 MWt

Wood,Wood chips


Constructing heating system in Olomouc


Wood chips


Heating station in Mariankich Lazni

3.4 MWt

Straw,Wood chips


Biomass boiler in New Jičína

1.5 MWt

Wood chips


Boiler for central heating in Zeliezovica (Slovakia)

2 MWt




For more accurate calculations and forming the inquires, please fill in form of questionnaire for biomass heating systems, by downloading from the link:

After filling the word document please send us on e-mail your inquiry for defining power of biomass furnace.

Pronađite nas na: