In-Depth Analysis Of Wood Fired Steam Boiler | Is It Worth Buying?

Did you know that you can burn the cheapest biomass fuel, like wood waste, and get maximum heat production for your industry? It is a big advantage resulting in less cost on fuel consumption and giving higher performance yields.

Wood fired steam boiler burns wood waste like wood pellet and wood chips obtained from sawmills and furniture factories to produce heat energy. This wood waste is readily available in abundance and is less expensive. Many other features make it worth buying for your industry. Let us discuss these features for steam boiler one by one in this blog.

Wood Fired Steam Boilers

Are you looking for an affordable and efficient steam boiler for your industries to generate maximum heat for your operations? And you don’t want to deal with the hectic routine of dumping your industry’s wood waste? Don’t worry!! Wood fired steam boiler is a perfect solution to all your problems.

Wood steam boiler is a type of biomass fired boiler. These burn biomass which is the residue of living organisms. Likewise, wood is also a biomass waste as it comes directly from plants.

Reversal Chamber Boiler

Wood waste comes in different forms and shapes. Each form of wood waste has its specifications and fuel-efficiency when burnt. A different form of wood waste requires a different steam boiler for high efficiency working. Choosing the correct boiler according to the waste type also saves the boiler from damage.

General Overview And Working Principle Of Wood Fired Steam Boiler

Did you know biomass like wood in the form of barks, branches, or twigs has always been in use as fuel? Yes, that’s true. Introducing wood fired steam boilers for cheap production of heat. It uses wood as a fuel to get maximum heat production. On the other hand, it also helps to get rid of wood waste quickly. This way, it also contributes to reducing pollution.

It works on a simple combustion process, just like any other steam boiler. The difference is that it takes in solid waste as fuel. The wood waste goes in from the waste input door and then to a furnace. The furnace is the chamber where the heat produces. It is surrounded by water. When the added fuel (waste wood) starts burning, it transfers its heat to the surrounding water through the process of radiation.

After the water starts heating, it circulates in the tubes of the boiler and converts into hot steam. This process gives almost 80-94% energy efficiency.


Wood fired steam boiler has a similar design to any other biomass fired boiler. Let’s have a glimpse of its design.

  • To begin with, it consists of the wood waste bunker where waste wood is added to initiate the burning process.
  • Then there is a traveling fuel auger which allows the passing of wood waste in the metering bins.
  • These metering bins, also known as metering augers, slowly rotate the wood waste to prevent wood compaction.
  • Next is the stoker auger, which takes wood fuel from the metering auger and prepares the solid waste for combustion.
  • From here, the wood waste is transferred to the combustion chamber. Here comes the burning process. The combustor uses a significant amount of oxygen to burn wood waste.
  • The burning of wood waste produces considerable amounts of ash. This ash is removed in the ash removal system.
  • The heat produced in the combustion process is now ready to travel in the boiler tubes.
  • Here the process of breaching takes place. A boiler tube is used for exhaust gas discharge. This ensures a smooth heat transfer, leaving room for more heat production.
  • Like any steam boiler, it also has an economizer known as a stack. It balances out the heat produced inside the boiler by transferring it into the boiler tubes.
  • This heat then reaches emission test ports, leaving the boiler and traveling to the water, thus serving its function.

Technical Specifications

Wood fired steam boiler is an efficient source of heat energy. It has various technical specifications that precise its functioning and some of them are as follows. However, these are not precise entries and may vary according to the type of boiler. Also, the size and dimensions of tubes, furnaces, combustion chambers and augers may vary according to the model of your wood fired steam boiler.

Capacity 100kg/hr
Fuel type Wood waste
Material Mild steel and stainless steel
Working pressure 5-10kg/cm2
Temperature range 170 degree Celsius
Operating pressure 215 psi

Types Of Wood Waste Used As Fuel

Wood waste can come in the form of wood logs, wood pellets, and wood chips. Each type has a unique form and density. Thus, every form provides different results.

Wood logs

Wood logs are manually treated and thus are primarily available in village areas. Because of their manual operation, they are used on small-scale levels as biomass fuel. Wood logs burn when they are completely dried.

DZL/DZL6-1.25-AII coal boiler

Wood Pellets

Wood pellets are readily available from suppliers of manufacturing industries using wood as the main component. They are dense and produce more energy than wood chips in the combustion process. Plus, they are small and take up less space.

They form by compressing wood waste, such as sawdust, into small tubular shapes for easy handling. They are often used in small wood fired steam boilers, such as outdoor pellets and froling pellets.

wood pellet

·       Outdoor Wood Boiler

The outdoor pellet boiler is an excellent replacement for wood stoves requiring excessive maintenance and care. You can link it to your house’s existing heating system and provides heat to the whole house. That is why it can also replace indoor heaters that can only heat one room at a time.

Wood Fired Boiler, Solid Fuel Fired Boiler For Sale No 1

What’s more? Outdoor pellet boiler saves both time and maintenance, providing extended heat production. It also comes in handy in terms of capital.

·       Froling pellet boiler

A Froling pellet boiler is a compact boiler. It not only works as a central heating system but also acts as a geezer to make water hot. The best thing is that it has a built-in lambda-controlled sensor.

Lambda sensors are efficient controllers of oxygen and fuel ratio in the combustion chambers. They prevent blasts in the exhaust section of a boiler.

coal fired heaters

Wood Chips

Wood chips are another waste wood used as fuel in wood fired steam boilers. These come from untreated wood waste. This means it is usually a by-product of the manufacturing process of sawmills. It also originates from furniture production.

Wood chips need larger space than wood pellets and are generally used in larger systems. These can sometimes be hazardous and contribute to pollution as they may contain different chemicals and paints from their source.

Types Of Industrial Wood Steam Boilers

As you know, waste wood generates different amounts of heat in different forms. Depending upon the type of wood waste, wood fired steam boiler also has various types. Let us discuss what factors contribute to wood fired steam boilers’ classification.

Criteria Of Classification

There is a broader range of wood fired steam boilers according to their function and specifications. These peculiarities are the reasons for its various types. These generally include:

  • The capacity of fuel consumption.
  • Amount of heat produced.
  • Fuel feeding system, which may be manual or automatic.
  • Fuel type and its characteristics.

Considering all these specifications, we have divided wood fired steam boilers into four main types.

Product Certificate

·       Stoker Burning Boiler

Stoker is the central part of wood fired steam boiler. It introduces the fuel into the combustor. The stoker burner boiler uses an overfed stoker which means the fuel is introduced in the boiler from the above. It is generally best suitable for small-capacity boilers, ranging from 30kW to 50kW.

Stoker burners use wood chips and pellets because of their small size and easy operation. As it is best suitable for small-capacity boilers, it is easily treated in a stoker boiler to produce heat.

It has two combustion chambers. One is a primary, and the other is a secondary combustion chamber. The primary combustion chamber takes in fuel to start the process of combustion. Afterward, it transfers the heat to the secondary combustion chamber to manage the temperature of the boiler. It takes in oxygen with the help of a single fan to carry on combustion. The fan in the combustion chamber plays a vital role in balancing the boiler temperature and preventing it from blasting.

There are several benefits of using stoker burning boiler, including

  • Simplest automatic feeding system
  • Less costly process because of the easy and abundant availability of fuel which produces maximum heat.
  • Rapidly balances temperature because two combustion chambers actively transfer heat from the primary to the secondary chamber.

industrial gas boiler regulations

·       Machine Grate Boilers

Machine grate boiler, also known as moving grate boiler, uses an overfed feeding technique. It can work in vast capacity ranges from 10kW to 100MW and is available in various flexible designs. Also, It has compatibility with various kinds of wood waste as fuel.

It has various inclined plates that transfer fuel to the combustion chambers. You can also change the speed of plates to change the duration of the whole process. This feature provides complete control of the combustion process to the user. Also, it ensures complete combustion by reducing the amount of soot or ash.

The machine grate boiler transfers fuel to combustion chambers through an auger and rams stoker. Fuel may be wood pellets or wood chips. The most common is wood chips, which are cheap. Plus, these can be fed in larger amounts compared to others.

moving grate boiler

Using a machine grate boiler is a good option because its moving and inclined plates prevent fuel stacking. A wide range of biomass fuels can be fed at once. Plus, it has two fans for the combustion chamber, unlike a stoker boiler. It provides additional oxygen and temperature control.

·       Underfed Stoker Boilers

As the name suggests, an underfed stoker boiler transfers fuel to the combustion chambers using augers under the grate. Combustion occurs in a dome-shaped chamber connected to the inverted cone-shaped grate from where it takes in fuel.

Its capacity generally exceeds 5MW. It mostly has separate fans for primary and secondary combustion chambers, aiding combustion control. The type of fuel can be wood chips or wood pellets.

underfed stoker boiler

Its most considerable flex is that it is available in various sizes. It provides maximum yield and lesser ash production. Because of the availability of separate fans, each combustion chamber quickly responds to heat changes.

·       Fluidized Bed Combustion Boiler

Fluidized bed combustion converts static solid fuel, such as wood waste, into a dynamic one. It changes its state by introducing forced pressurized liquid to the solid fuel. This boiler also uses particular burning particles that provide extreme temperatures to change the form of a solid.

After this process, the solid waste now possesses fluid-like properties. This helps to burn fluid waste easily. It also reduces ash or suit emissions and makes its removal easier.

thermal fluid heater

Some other benefits include

  • It takes up lesser space.
  • Less emission of harmful chemicals.
  • Can deal with complex solid waste by converting it into a fluid.
  • Soot or ash is easily removed and doesn’t constantly accumulate inside the boiler.
  • The use of unique burning particles has higher efficiency in the combustion process.

Log boiler

Another type of wood waste fired boiler is a log boiler. These log boilers burn wood logs as fuel. They are easy to operate and require more manual labor. Despite more labor, it is relatively less costly in terms of operation, maintenance, and installation. They are most commonly available in less industrial areas like rural vicinities.

Its advantages include its relatively low cost and simple and easy maintenance. But it demands effort to dry the wood logs before using them as fuel.

Buying Considerations For Wood Fired Steam Boiler

Choosing an efficient wood fired steam boiler for your industry is quite a matter of concern. You can decide by considering your industry’s demands and working strategies. Wood fired boilers can be an efficient choice for your industry as they occupy less space. They are compact. Plus, their heat emission system designs prevent blasts in the boilers.

If you are looking to buy an effective wood fired steam boiler, then you must consider the following factors before making a purchase:

·       Safety

Safety must be a significant concern when considering a boiler. A boiler is a continuous heating system that requires proper handling and care. Also, it must have a robust design to handle extreme temperatures and pressures.

In a matter of safety, wood fired boilers are safer than other industrial boilers because of their dual combustion chamber. Moreover, they use lambda sensors that manage the temperature inside the boiler effectively. Therefore, the temperature remains in controlled levels, preventing any mishaps in the boiler structure

·       Reliability

It would be best if you are looking for a reliable steam boiler for your industry because your work depends on a boiler. Plus, it isn’t something that you can buy every day; It’s a one-time investment. So, it’s crucial to consider the boiler’s reliability in the first place.

Wood fired steam boilers are reliable because they don’t need additional chemicals to start their process. They have built-in burners and air-controlling fans. So, they are primarily on their own. These features make it a good option for your industry. Also, wood fired boilers have longer life spans than other industrial boilers.

Durable packaged boiler equipped with single drum and chain grate

·       Cost

Every industry wants maximum outcomes with lesser investment. It would help if you had a budget-friendly boiler for your industry that can give you maximum heat production. In this case, wood fired steam boiler is an excellent option for your industry. They are relatively less costly and take in less fuel to provide full steam launch. So, you are saving on buying costs and fuel costs in one place.

·       Life of a boiler

Along with the cost, the life of a boiler is also a matter of concern. A suitable boiler is one that gives long-term efficient working. It should not be the one demanding costly maintenance after short time intervals.

Wood fired steam boilers are a great option in this case because their ash or soot deposit inside the walls of the boiler is not much hazardous and doesn’t block the way of steam. Plus, most wood fired boilers do not accumulate large amounts of soot. This means that it will protect your boiler from wear, tear and corrosion by guaranteeing a longer life span.


In the evidence of all these facts, there is no doubt that wood fired steam boilers are an efficient choice for your industry. These boilers serve their purpose effectively and save your manual efforts.

For example, this boiler is cost-friendly and efficient in its working. This way, it decreases your investment and increases your industry’s annual revenue by giving maximum production.

Now you know why wood fired steam boilers are an excellent option for your industry, you may ask where to buy them. Well, there are many options to choose from as many progressing companies provide the best options. But try to choose the one that provides complete usage strategies and testing samples to ensure safety and reliability.

As per customer demands, we have many designs of wood fired steam boiler for sale that is tested and trusted after undergoing several experimental procedures.

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