Specific Instructions For Reciprocating Boiler Grate

The reciprocating boiler grate is a small mechanized grate developed on the basis of the fixed stepped grate. It has the characteristics of simple structure, convenient manufacture, low metal consumption and good dust removal effect. Widely used in small industrial boilers, it is a kind of combustion equipment with great development prospects.
The structure of reciprocating grate includes: inclined reciprocating grate, horizontal reciprocating grate and water-cooled reciprocating grate. There are two types of inclined reciprocating boiler grate structures, one is the more common general inclined reciprocating grate, and the other is the water-cooled reciprocating grate developed in recent years.
The general inclined reciprocating boiler grate is mainly composed of fixed grate pieces, movable grate pieces, transmission mechanism and reciprocating mechanism. The entire combustion surface of the grate is composed of fixed grate pieces and movable grate pieces, which are stacked at intervals in a stepped shape and inclined at 15°. ~20. trumpet. Install the fixed grate on the fixed grate beam, and then fix the fixed grate beam on the inclined channel steel bracket. The movable grate is installed on the movable grate beam, and the movable grate beam leans on the rollers released from the two ends of the fixed grate beam. The lower ends on both sides of all movable grate beams are connected as a whole by connecting rods.
When the motor is started, the transmission mechanism drives the eccentric wheel to pass through the movable rod, connecting rod, push-pull shaft and connecting rod, so that the movable grate reciprocates on the fixed grate. The reciprocating stroke is generally 30~70mm, and the coal moves downward and backward accordingly. The motor is controlled by a time relay, and the on-off time is adjusted according to the requirements of different boiler loads and coal types.
The water-cooled reciprocating boiler grate is mainly composed of butterfly cast iron grate, water pipe frame, transmission mechanism and reciprocating mechanism. The water pipe rack is composed of a row of straight pipes with both ends welded on the header, and the front and rear headers are respectively connected with the connecting pipe and the steam drum to form a circulation loop. The butterfly-shaped cast iron grate is embedded between the pipes of the water pipe rack. The contact surface between the grate and the pipe is coated with metal powder mixed with water glass, and is tightly molded with modules. The flow of pot water cools the butterfly-shaped cast iron grate. Behind the inclined reciprocating grate, some are equipped with a burnout grate (also known as an afterburner grate). The ash basically burns off all the combustibles on this grate, then flip the grate over and dump out all the ash. Due to the serious air leakage of the burned out grate and complicated air conditioning, the ash pit is usually sealed with water, and the slag is discharged regularly or continuously.
When the inclined reciprocating grate is used together with coal with more volatile content and fast ignition, it is easy to burn at the exit of the coal hopper, and the coal hopper emits smoke. In order to eliminate this defect, the secondary air can be used to blow the flame to the furnace through the coal door. But a more thorough solution is to improve the coal feeding device under the coal scuttle, so that the coal leaves the coal scuttle, and then passes through the coal feeding plate, and is sent into the depth of the furnace before burning.
The inclined reciprocating boiler grate is the same as the chain furnace. In order to make the coal ignite smoothly and strengthen the gas mixing in the furnace, it is also necessary to arrange the furnace arch. For the specific situation of the reciprocating grate, a relatively simple inclined front arch can generally be used. When burning bituminous coal and lignite, some do not have a low and long back arch, but use a middle arch or a middle partition to match the front arch to help the new coal ignite. The middle arch or partition wall can be completely vertical, or the lower part can be vertical and the upper part can be inclined forward. When burning bituminous coal, a vertical rear partition wall is often used, and some slag retaining arches are also set up, that is, a small arch is extended on the rear wall to dissipate heat to the burnout area, so that the ash and slag can be completely burned.