A.V.Luikov Heat and Mass Transfer Institute of the NAS of Belarus offers consumers the technology of two-stage combustion of solid biofuels in a fluidized bed under a commercial agreements with technical assistance, equipment for burning solid biofuels under a manufacturing agreement.

The development of technologies and boiler equipment with fluidized bed furnaces is considered one of the most promising areas in modern thermal power engineering. The fluidized bed, which is a randomly circulating mixture of solid fuel and inert non-combustible materials, ensures stable combustion in a fairly narrow, stable and controlled temperature range.

A.V.Luikov Heat and Mass Transfer Institute of the NAS of Belarus has developed a technology for two-stage combustion of solid biofuels in a fluidized bed, which combines layered fuel combustion with vortex afterburning of fine fractions and gaseous combustible products in the above-layer space.

The technology allows maximum use of the energy potential of the fuel and at the same time minimizes the formation of harmful gaseous emissions. Adjustment of technological parameters allows you to burn almost any materials of organic origin, including household waste.

The technology makes it possible to implement a furnace process with a higher thermal stress of the furnace volume, significantly reduce the excess air coefficient, increase the efficiency of the boiler and reduce the concentration of carbon monoxide in the exhaust gases compared to direct-flow stratified combustion furnaces.

The method of two-stage combustion with a vortex organization of the above-layer space of solid biofuels can significantly reduce the excess air coefficient (up to α = 1.15-1.25) and reduce the concentration of carbon monoxide (CO) in the exhaust gases compared to direct-flow stratified combustion furnaces without flow swirling.

The geometrical parameters of the furnace (relative pinch diameter dout/D, free area of ​​the nozzles), furnace operation modes (power, ratio of bottom and tangential blast) are optimized, at which the concentration of nitrogen oxides does not exceed 500 mg/nm3, and carbon monoxide 50÷500 mg/ nm3 (at α = 1.2).

Technology characteristics:

excess air ratio	1,15-1,25
efficiency coefficient	до 92 %
metal consumption reduction	by 20…30 %

The main advantages of the developed technology are:
- high-quality vortex mixture formation of volatile products of incomplete combustion with secondary air supplied tangentially to the above-layer space;
- a significant reduction in the entrainment of fine particles due to the action of centrifugal force;
- a noticeable decrease in the above-layer space and, consequently, the dimensions of the furnace.

Scope: furnace equipment.

The Institute offers partners:
* as part of a commercial agreement with technical assistance, the acquisition of technology of two-stage combustion of solid biofuels in a fluidized bed;
* equipment for combustion of solid biofuels under a manufacturing agreement.

The technology of two-stage combustion of solid biofuels can be used to create boilers of small and medium power (≤ 9.0 MW) for burning solid biofuels (wood and household waste, milled peat, pellets from agricultural waste, bedding and manure, activated sludge) of high humidity (up to 55-60%).

The content of CO and NOx in the exhaust gases is significantly lower than the requirements of regulatory documents.

A prototype of a cyclone-layer furnace has been created. A water boiler with a capacity of 2 MW is successfully operated in the Brest housing and communal services.

A working prototype of the furnace was presented as part of the Belarusian Industrial Forum 2018.

Patent of the Republic of Belarus for utility model № 7853 dated 2011.12.30;
Patent of the Republic of Belarus for utility model № 8360 dated 2012.06.30;
Patent of the Republic of Belarus for utility model № 10824 dated 2015.10.30;
Patent of the Republic of Belarus for utility model № 11136 dated 2016.08.30.

A.V. Luikov Institute of Heat and Mass Transfer of the NAS of Belarus is the largest scientific institution in the republic dealing with fundamental and applied problems of heat and mass transfer, fluid dynamics, energy, heat engineering, chemical physics, physics of combustion and explosion, nanotechnologies, as well as the creation of energy-efficient and environmentally friendly technologies and equipment, devices and devices for energy and mechanical engineering, agro-industrial complex and construction industry, medicine, chemical, electronic, radio engineering, food industry, space industry.

Main directions of scientific and technical activity:
- processes of heat and mass transfer in capillary-porous bodies, disperse systems, rheological and turbulent media, non-equilibrium flows, low-temperature plasma and in the interaction of radiation with matter;
- dynamics, transfer and elementary processes in systems with chemical and phase transformations;
- physical kinetics, heat transfer and transport processes on micro- and nanoscales;
- energy-efficient heat and mass transfer technologies, equipment and devices;
- transfer processes, heat transfer in biological systems and complex molecules;
- physical and structural properties of substances, materials and surfaces under internal structuring and extreme impacts;
- mechanics of liquids, gases and plasma;
- mechanics and rheology of viscoelastic media under shear, temperature, electromagnetic influences;
- numerical methods and software packages for numerical simulation of physical, chemical and heat transfer processes;
- catalytic technologies and equipment for the production of hydrogen, synthesis-, endo- and exo-gases, synthetic and mixed fuels;
- technologies and equipment for the processes of obtaining nano- and micro-structures and materials;
- plasma, plasma-chemical and chemical methods of waste treatment and disposal.

The Institute carries out scientific, scientific-organizational and scientific-production cooperation with academic and industry research institutes, universities, design bureaus, associations and enterprises of Belarus, Russia, Ukraine, Kazakhstan, Moldova, Uzbekistan, Lithuania, Latvia, China, USA, India, Germany, Poland , Czech Republic, Israel, Brazil, Italy, France and other countries.

Consumers interested in purchasing a technology of two-stage combustion of solid biofuels in a fluidized bed under a commercial agreements with technical assistance.

Partners interested in acquiring equipment for the combustion of solid biofuels under a manufacturing agreement.