Steam boiler for solid fuels

Steam boiler for solid fuels

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Warranty 12 months

DBW series biomass-fired boilers

The two-drum steam boilers have designed to generate saturated and superheated steam using various types of biomass, food and agricultural waste and have steam capacity from 4,0 to 10,0 t/h. The furnace is completely water-cooled using membrane wall construction. The boilers used reciprocating grate for fuel combustion.

The boiler operates both on wood chips and on complex fuels:

  • husk of sunflower

  • litter of poultry complexes

  • Weeds of oats and other cereals

  • Peat

  • Lignin

  • Corn stalk

  • soybean waste

  • Waste pellets

Boilers provide a fully automated operation mode without the need for a constant presence of maintenance personnel.

Equipment advantages:

  • Burns various fuels from biomass. (humidity level up to 55 percent)

  • Low NOX and CO emissions - optimum combustion. Correction of the combustion process occurs fully automatically

  • Gas-tight execution of panels, automatic cleaning of surfaces

  • Ability to burn low-quality fuel

  • High boiler efficiency - at least 85% 

Solid Fuel Steam Boiler
Щнековый питатель топлива

Fuel feeding system

  Fuel feeding system consists of screw feeders ( the number of the screw feeders depends on the steam boiler capacity), fuel bunker with level sensors. The screw feeders use to control biomass flow from the fuel bunker at a uniform rate.

Fuel is supplied to the boiler furnace through water-cooled wall which is mounted in the front of the reciprocating grate. This water-cooled wall prevents  ignition of fuel in the screw feeders at low loads. Temperature sensors are installed on the screw feeders bodies in case of fuel ignition and water supply for fire extinguishing is provided.

Reciprocating grate stoker

The reciprocating grate stoker consists of alternating rows of fixed and moving grate bars. The grate is devided into several air zones along the length which allows to achieve optimal results when burning different types of fuel. The undergrate air in combination with overfire air, which is fed though the nozzles located on the furnace wall, allows to achieve good results of emissions in the atmosphere. 

The moving speed and the shape of the grate bars depend on the fuel, the moisture content of which can be up to 55 %.

The grate bars are made of cast iron with a chromium content of 27%, which in combination with the optimized shape of the grate bars for different types of fuel, ensures a long life cycle of the grate.

Колосниковая решетка
Шнек золоудаления с котла

Ash handling system 

The fully water-cooled deashing screw is placed at the end of the combustion grate and transports the ashes from the grate to the dry deashing conveyor.

Boiler automation

Automation provides control, automatic control and protection of steam boiler from emergencies.  

Boiler control includes:

  • Control the boiler drum water level;

  • Control and regulation of pressure in the boiler;

  • Rarefaction  regulation in the boiler furnace;

  • Regulation of the amount of primary and secondary air;

  • Furnace temperature control;

  • Flue gases temperature control;

  • Economizer inlet and outlet water temperature control;

  • Fuel feed control;

  • Reciprocating grate control;

  • Automatic ash removal;

  • Boiler protection

Consists of:

  • boiler control panel

  • fans control panel

  • sensors and indicating devices

  • actuators

Панель управления котлом
Щит управления паровым котлом

Boiler control panel

The control panel has a metal body. Frequency converters, power supply, circuit breakers, controller with I / O modules, motor circuit breakers are installed inside. On the doors there is an operator panel, a power indicator, a button for resetting the audible alarm, a button "Emergency stop of the boiler" and a ventilation grill with a filter and a fan.

Induced draft fan and forced draft fans control panel

Щит управления дымососом

The control panel has a metal body. Frequency converters, circuit breakers for short-circuit protection of converters are installed inside. On the doors there is an operator panel, indicator lights, and a ventilation grill with a filter and a fan.

Scope of delivery

The scope of delivery of the boiler unit includes: a boiler pipe system with supporting structures, a fuel supply system (fuel bunker, screw feeders), a reciprocating grate stoker with an ash handling system and air circuits.

Optionally, at the request of the customer, insulation, refractory lining, draft fans, valves and pipelines within the boiler, ladders and platforms, and boiler automation set.