Everything You Should Know About Coal Fired Steam Boiler

How Is Your Coal Fired Steam Boiler Works?

Using finely ground coal for combustion comes from the idea that if the powdered coal is fine enough, it will burn nearly as readily and effectively as gas.

Using pellet coal as a fuel, the coal is ground into a powder, with less than 2% above 300 microns and 70-75% under microns. A portion of the combustion air is mixed with the pellet coal and blasted into the boiler plant through a series of burner nozzles along with it. The heat of combustion ranges from 1300-1700 degrees Celsius, mainly dependent on the kind of coal used.

When a furnace produces flue gas, it travels through many components, including the superheater, economizer, air preheater, and ESP, before being expelled up the chimney by an induced draught fan. Here, you can see the coal fired steam boiler design in this figure.

Now, Bottom ash hoppers catch the combustion chamber ash that falls to the ground. ESP separates the fine ash that flies in the flue gas and collects it in ESP hoppers. The ash is collected in these hoppers.

Then Feed Water enters the boiler through the flue gas economizer tubes. The flue gas passes via economizer tubes that heat the feed water. The boiler’s feed water is heated in the economizer before entering the boiler drum located above the furnace.

After that, water circulates through the tubes and is heated in the furnace, turning it into steam. From there, it goes via a superheater portion before becoming accessible at the boiler output header.

Pellet fuel firing system is widely used nowadays because it greatly improves the thermal efficiency of solid fuel. In the pellet fuel fire system, we use grinding mills to ground the coal finely. We call the process of pulverizing the fuel powder. Hot air sprayed over the crushed coal in the combustion chamber. Extra air needed to complete the combustion is called secondary air. Thermal efficiency of pellet fuel-burning relies on the crushed coal fineness. When coal is not appropriate for solid fuel-burning, pellet fuel is used.

Benefits Of Coal Fired Steam Boiler

• Coal’s surface area for burning is greatly increased by crushing it, increasing thermal efficiency. Consequently, the rate of combustion is accelerated, and less secondary air is needed to complete the combustion. As a result, the air intake fans’ workload is lightened.
• Even lower-grade coal may be turned into a useful fuel by pulverizing it.
• By increasing the combustion rate, you improve the system’s responsiveness to changes in load.
• In a pellet coal fire system, there are no clinker or slagging issues.
• A greater quantity of heat is produced than a solid firing system of the same physical size.
• Pellet coal fire system may be up and running in less time than the solid firing system. Even in a cold state, it can quickly and effectively begin functioning. This boiler system characteristic is critical to the overall stability of the electrical grid.
• The Pellet firing system’s other key characteristic is the absence of any moving components within the combustion chamber, ensuring a long service life.
• It’s easier to manage the ash with this system since there’s no solid ash to handle

What Is Your Chain Grate Coal Fired Steam Boiler?

Solid fuel is drawn into the furnace by rotating an endless chain-grate kind of mechanical stoker for the furnace.

Boiler grate is a similar term. Heat Exchanger Grate for a Boiler. In a steam boiler furnace, a grate is supplied to support the solid fuel. As part of its construction, these grates may also let air into the solid fuel to help it burn more efficiently.

Solid fuel like coal, coke, or anthracite is fed into a steam boiler’s furnace through mechanical stokers. After 1900, they were popular on steam locomotives and ships and in power plants.

A fireman, stoker, or water tender’s job is to keep the fires in boilers, buildings, or steam engines burning smoothly. Much of the work entails strenuous physical activity, such as shoveling coal into the boiler’s firebox.

How About Your Coal Fired Steam Boiler Efficiency?

Coal-fired steam boiler efficiency measures how much energy is derived from each pound of coal burned to produce one tonne of steam to be used in the boiler.

It comprises thermal efficiency, combustion efficiency, and fuel-to-steam efficiency. The effectiveness of a steam boiler is directly related to its size. Steam boilers typically have an efficiency between 80 and 88 percent.

Many losses may occur, such as incomplete combustion, radiation from the steam boiler outside the wall, and faulty combustion gas. As a result, steam boiler efficiency leads to this outcome.

Boiler operation and maintenance have an impact on thermal efficiency. Heat transfer fouling, poor combustion, operation, and maintenance lead to decreased boiler efficiency and evaporation ratio over time. Weakened fuel and water quality may also have an impact on boiler efficiency. Heat absorption in the main and secondary air preheaters controls the boiler efficiency loss at the exit. This increase in flue gas temperature is responsible for the efficiency loss.

As the operating conditions change regularly, efficiency is an important performance metric for boiler maintenance. The boiler’s efficiency may be assessed using both direct and indirect techniques. There are two methods for evaluating boiler efficiency in this paper: a direct approach and an indirect way, and their limits are presented.

Does Coal Fired Steam Boiler Belong To Water Tube Boiler?

Yes, coal-fired steam boiler is one kind of water tube boiler. A water tube boiler is a steam boiler in which water and hot gases travel through the tubes. Unlike fire tube boilers, this boiler can reach high pressures and high steam capacities. This is due to hoop stress or concentrated tangential pressure on tubes.

Water tube boilers produce high-temperature and high-pressure steam. It has a tiny steam drum and narrow tubes within. This boiler’s components produce high-volume vapor for high-capacity uses.

Our coal fired steam boilers are the most used, replacing fire tube boilers due to less weight, quicker steam production, bespoke design, and high efficiency. Earlier water tubes feature a single drum linked by short straight tubes and curved pipes. The hot gases will only cross the pipes once. See the coal fired steam boiler diagram.

Can I Know What Kind of Your Coal Fired Steam Boiler is For Sale?

There are many types of boilers like DZL, SZL, and LHG. You will get to know most about fuel fired boilers and coal boilers.

You can easily get wood fired steam boiler, biomass steam boiler, and water tube boiler. These entire boilers have the best efficiency. You will be pleased to know that all these boilers meet international standards. Here you will get the best coal fired steam boiler price than other suppliers. Coal fired steam boiler china gives you the best competitive price worldwide.

• DZL Coal Fired Steam Boiler

You can easily get DZL Coal/Biomass Fired Boiler. Fuel for the DZL type biodiesel boiler is made from wood pellets and has a vertical single-drum chain grate design. It’s a brand-new kind of high-efficiency boiler that consumes less energy. As a renewable energy source, wood fuel biomass is excellent because of its year-round high production.

This boiler may take the place of coal-burning power plants, saving businesses money on fuel expenses while also using trash in a way that has the potential to provide significant economic gains. As a result of this, economic and social progress has been made. Other benefits include a quick ramp-up time, excellent thermal efficiency, and an expansive heating surface.

• DZH Hand Feeding Coal Fired Steam Boiler

A single-drum vertical type is the DZH type manually biomass fuelled boiler. Our business came up with this new boiler as a reaction to environmental protection policies. As a fuel, it makes use of biomass pellets made from agricultural wastes including straw, sawdust, and peanut shells. Flue gas emissions are significantly decreased compared to coal-fired boilers, and they satisfy all applicable environmental regulations.

• SZL Large Capacity Coal Fired Steam Boiler

Clean biomass fuel is used in the SZL type biomass boiler, which has a double-drum vertical configuration with a chain grate. It’s up to date with consumer preferences and market demands. The top body boiler and the bottom combustion portion make up the boiler. Furnace, combustion chamber, convection tube bundle, and so on all contribute to the generation of flue gas that exits the tail flue. In order to exhaust, a dust collector, an inducer fan, and a chimney are used.

Do You Have Other Boilers Similar To Coal Fired Steam Boiler?

As we all know, with the recent bad environmental development, many highly polluting products will be gradually replaced. Here, we also have more choices similar to coal fired steam boiler. Better choices can make us greener, low-carbon, and make our own contribution to the planet.

Here we recommend 2 alternatives to coal fired steam boiler

Biomass steam boiler

The growing desire for greener energy sources has prompted several boiler manufacturers to reinvent biomass to produce steam and heat. To regulate emissions air quality, today’s biomass boiler uses advanced technologies. New designs, cutting-edge technology, and a glimpse into the future arrived with the modernization of steam boilers.

Biomass boilers produce heat by burning organic materials. Fuel is ignited by feeding it into a combustion chamber — either manually or semi-automatically. To utilize the property’s central heating system, hot gas and air generated by this process flow via a chimney and into a heat exchanger.

Wood fired boiler

Wood is the world’s oldest fuel source. Heating with wood is self-sufficient and reliable. Wood heating systems are perfect for people who own or have access to a forest. Gasoline is affordable and readily accessible. Also, compared to oil and gas, wood heating saves a lot of CO2.

Wood boilers are becoming more popular as households seek alternate heating methods. The use of wood boilers for residential heating reduces fossil fuel use and expenses. A wood burner can replace your whole heating system in a few hours.

To produce heat, a wood boiler burns firewood in a regulated chamber. In a nutshell, the fuel source distinguishes a wood boiler from an oil boiler. Wood fuel benefits the local economy and reduces gasoline expenses.

Outdoor and indoor wood boilers are available. Unlike outside wood boilers, interior wood boilers are weatherproof and transmit heat through pipes to your home.

A wood boiler has two chambers, an ash box, a water supply, return connections, and a control system. They then light the wood and let it burn. Starting with the wood, the gases draw into the secondary chamber, burning to maximum heat production. Heat transfer tubes produce hot water by transferring heat to pipes.

Due to the chamber’s high efficiency, hazardous smoke is reduced considerably. Wood boilers may be used as a backup system for your current furnace or as your main source of heat all year. Mainly all boilers are made on the coal fired model.

Conclusion:

Once you are going to take a new coal boiler, first think about our coal fired steam boiler. It helps you to save fuel cost and investment cost. We have rich experience in sales, installation and after-sales. Please feel free to contact us.