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Solid lump fuels such as coal, peat, chips of wood and waste can be burnt in a fire grate , in order to generate steam and possibly eliminate wastes. The grate is disposed in the combustion space either horizontally or at an angle. The grate consists of grate bars or grate plates, in or between which grate slots are provided. Stationary and movable grates are known. In the movable grates, the grate bars or plates are disposed on rotating rollers, or form an endless, moving belt, or are moved by vibration. The fuel is charged onto the grate manufacturer in the form of a layer. In the case of moving grates, the fuel is transported through the combustion space under the influence of gravity and/or the vibration of the grate bars or the rotation of the grate rollers or the speed of movement of the grate belt, where it burns with the combustion air. The combustion air is supplied to the fuel layer from the bottom through the grate slots (primary air). It is possible to supply part of the combustion air-to the fuel layer also from the top (secondary air).
The temperature at the surface of the grate bars and plates during the combustion and in particular during the ignition may reach values between 650 and 950° C., so that a cooling of the grate is required. Such cooling normally is effected by the combustion air. However, there are also known firing grates which are cooled with water. A small part of the ash formed during the combustion drops through the grate slots or through the spaces between the individual grate bar groups and is collected in ash hoppers. In the inclined and/or movable grates, the major part of the ash is dumped at the end of the grate. In the stationary, horizontal grates, the discharge of the ash is effected periodically, e.g. by shaking the grate bars or plates.
Fireplace grates are essential for a fireplace to make the fire more efficient by keeping all the wood together. There are different styles and types of fireplace grates. The selection of a grate depends on several factors, including how often you use your fireplace. There are also stylistic considerations. Some fireplace grates are more ornately designed than others, so the grate you select should fit in with the décor of the room. source:news jinma-boiler
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