Heating systems of the latest generation are developing in the direction of increasing efficiency. The most popular in connection with the increase in the cost of energy were heating devices with high efficiency, they are capable of generating the maximum amount of heat with the same fuel load.
In the field of developing energy-efficient furnace devices, coal-fired boilers have become a real breakthrough. By purchasing the described equipment, you become the owner of a modern device that is capable of working for a long time without human intervention. There is no need to control its operation during operation of the unit, constantly tossing fuel. In this case, the boiler will maintain a high temperature, which transfers heat to the heat carrier in the heat exchanger.
Principle of operation
Coal fired boilers operate on a different principle, burning in them does not occur from the bottom up, but on the opposite principle. Thanks to modern technology, the boiler has acquired a device where the combustion process spreads from top to bottom. This allows you to achieve maximum burning time of the fuel, therefore, the user saves on heating.
If you plan to purchase such equipment, consider boilers for long burning on coal, then you should be prepared for some difficulties, namely the need for large reserves of fuel. Among other things, coal will require a separate storage space, which must be located close to the room where the equipment is installed. It is important to exclude damping of coal, as well as blowing fuel with a strong wind.
The owner of the equipment will have to load fuel in the usual way with a shovel or specially scoop. After complete combustion of the fuel, the boiler requires cleaning, since soot settles on the internal surfaces, which negatively affects the efficiency of the device, reducing efficiency by 15%. The places where the coal is loaded, as well as the fuel exhaust channels, are subject to cleaning, since they are responsible for the injection of oxygen and the quality of combustion. Most often, the combustion chamber in such equipment is quite voluminous, it is able to accommodate a huge amount of fuel. This allows you to heat the house during the day and even more, which in a particular case depends on the model. In this case, you do not have to load additional coal.
Long burning process
Coal fired boilers are sometimes equipped with a combustion chamber, the volume of which is 500 liters. A limited amount of air is supplied through the top located duct into the device, or rather, into the combustion chamber. Coming inside, it contributes to decay, but not burning, where open fire would be present.
The heating system, which is based on a long-burning boiler, has a heat exchanger located in a special way. If we are talking about traditional furnaces, then this element is located in the upper region of the furnace compartment, in the place where the greatest heating occurs. As for the chambers of long burning, the coil of the heat exchanger is oriented along the walls of the inner surface of the furnace. This helps increase system efficiency by up to 95 percent.
The combustion process is controlled by special devices. Automation guarantees a uniform supply of oxygen to all layers of combustible fuel, ensuring consistent and complete combustion of coal. All this together with the uniform heat generation increases the efficiency of long-term combustion devices.
Main advantages
Boilers for long burning on coal are not chosen by consumers by chance, they have many advantages.
The consumer has the opportunity to use not only coal as fuel, but also other materials such as wood, sawdust and peat. After one boot, the equipment will work for a long time, while human intervention is not required, the device will function for a day or more, everything will depend on the model.
The coal-fired boiler has more outstanding characteristics, heat dissipation and efficiency compared to analogues. With the help of such units, you can easily heat an arbitrarily large area, but it is important to choose the right boiler power. Fuel consumption when using such equipment is reduced by 50%. This indicates a reduction in heating costs.
Additional advantages
A coal boiler is chosen by customers not only because of energy savings, because in such a device all the fuel is not simultaneously burned. The process resembles smoldering, in which coal enters the furnace, which begins to be burned in layers. Air injection to ensure a chemical reaction is automatically controlled. Gradual combustion leads to the fact that coal burns out almost completely, only 2% of the initial loaded mass accounts for individual unburned residues.
Solid fuel boilers not only do not involve operator intervention in the work for several days, but also reduce the level of complexity of servicing the device, since soot is formed in smaller quantities. As a rule, solid fuel heating boilers are overheated. This is due to the unevenness of the combustion process. During operation of long-burning boilers, the process is automatically regulated, which is the key to an even temperature distribution. This mode is very convenient to use in heating systems, because it is possible to maintain comfortable conditions in the house.
Main disadvantages
Solid fuel boilers, like any other equipment, have their drawbacks. In the manufacturing process, fairly complex automation is used, which can significantly increase the cost of the device. As a result, the price is 2 times higher compared to conventional designs, which have the same power.
Among other things, for the reason that the combustion process is automated, the owner of the equipment cannot interfere with the operation of the boiler during coal smoldering. This indicates that it is not possible to extend the combustion period in such a device. Sometimes this creates certain difficulties during operation.
Boiler device
Pyrolysis boilers for long-burning coal operate on the principle of fuel combustion. The combustion chamber of such units has a cylindrical shape, as for the whole case, in which 2 doors are built. One of them is designed for unloading ash, while the other is for filling fuel. The ash chamber is located below, it is separated by the grate from the firebox. The device of a long-burning coal-fired boiler provides an opening in the upper part of the body through which oxygen is supplied to the firebox by a fan.
An air channel is presented to the opening from the inside, represented by a tube, at the end of which a steel pancake with an opening for oxygen is fixed. The pipe is composed of several sections, forming a telescopic structure. The pancake, which performs the function of the cargo, is made of 10 mm metal, its diameter is smaller than the size of the furnace for moving the element inside. There are metal fins on the bottom surface of the cargo to disperse the air. The telescopic design at the end has a mechanical drive, which is necessary for the movement of the node.
Consumer Reviews
If you are interested in boilers of long burning on coal, it is recommended to read customer reviews. Perhaps they will let you understand which model is best to choose for your home.
Customers quite often purchase Stropuva products, which are medium-sized boilers for sale. If, over time, you are no longer satisfied with the working pressure indicator, you can increase it to 3 bar with an initial 1.5. Owners of private houses argue that such equipment is not at all demanding not only in terms of fuel, but also to the moisture content of wood, if you intend to use it for kindling. The main thing is to provide oxygen access.
How to choose coal
Those users who decide to purchase the equipment described in the article should think about which coal is best for a long-burning boiler. Experts advise using anthracite, coal or lignite. It is universally available in any quantities, it can be purchased in the amount of one bag or several tons.
Cost
Consumers who choose a coal burning boiler for their home, the price of which they are primarily interested in, pay attention to the manufacturer as well. Domestic factory "Conord" offers for sale single-circuit and double-circuit boilers with a capacity of 16 watts, the minimum price of which is 18,000 rubles. If you need higher power, then you can purchase Siberia Hephaestus equipment, which will cost 17800 rubles.