RU212520U1 - Moving bottom firebox - Google Patents

Abstract

The utility model relates to devices for burning hard and brown coal and can be used in the manufacture of boilers. A furnace with a movable bottom contains a frame formed by longitudinal lower beams 1 and longitudinal upper beams 2, between which there are racks 3 along the length of the device. On the upper beams 2 there is a section with support beams 4 for installing the combustion chamber of the furnace. For loading and supplying fuel, the furnace is equipped with a hopper 5 with a feeder 6. A single movable bottom is placed under the hopper 5, which has the ability to reciprocate. The movable bottom is assembled on a separate frame 8, which is placed inside the frame along its length and rests on wheels 7 mounted on racks 3. On the frame 8 there is a stoker floor 9 with teeth 10, the continuation of which is a water-cooled 15 grate without failure, connected to a water source through pipelines 17. Support beams 4 are made with windows 11, which are arranged in pairs and opposite to each other. On the support beams 4 above the frame 8 there are screwing strips 12, each of which is a trihedral hollow strip, at both ends of which there are hollow bodies 13 and 14, equipped with fittings 15, 16, for connecting water supply pipelines to the screwing strip 12. All screwing the strips 12 with their hollow bodies 13,14 are brought into the corresponding windows 11 of the support beams 4 and detachably fixed in them. The technical result is the possibility of replacing a failed screwing bar without stopping the boiler and with a minimum number of repair operations. 3 w.p. f-ly, 5 ill.

Description

The utility model relates to devices for burning hard and brown coal and can be used in the manufacture of boilers.

Known is a furnace with a screwing bar, in which, in order to simultaneously mechanize the supply of fuel to the grate and remove focal residues from the ash pan, a chain moving forward and backward is used, bending in one direction and having a common drive, to one end of which a fuel-spinning bar is attached, and to the second a scraper is attached to the end, which removes slag from the ash pan (SU 85412 A1, publ. 09/30/1950).

The applicant also took into account the technical solution for the utility model patent of the Russian Federation No. 115334, publ. 27.0.2012, Stoker floor "Live bottom".

The closest technical solution adopted by the applicant as a prototype is a firebox with a screed bar, consisting of a base in the form of a frame with longitudinal lower and upper beams, as well as racks between them, installed along the length of the frame, on the upper beams there is a section with support beams for installation of a combustion chamber, a cooled grate, a shaving bar driven by a mechanical drive, a shaft with tilting grates, a mechanism for their rotation and a bunker with a sector feeder, and the part of the base located under the grate and forming a blast box is divided by transverse partitions into zones, each of which has on one side a separate window for connecting the air duct with a valve, and on the opposite side - a window for removing the dip, the grate consists of non-dip grates, which are bolted to a water-cooled grate made of steel pipes, while the mechanism for turning overturning i of the grates is equipped with an electromechanical drive, and the upper part of the base frame is made on the sides with cast-iron seals and guides in the form of channels facing the shelves down with the possibility of installing boiler collectors on them (utility model RF No. 70344, publ. 20.01.2003).

The disadvantage of this technical solution is that in case of failure of the screwing bar designed for moving and shoving fuel, in order to replace it, the operation of the boiler should be stopped to cool it down, this takes several hours. At the same time, she

The technical objective of the claimed utility model is to improve the maintainability of the device.

The technical result achieved in this case is that a failed screwing bar installed in the boiler furnace can be replaced without stopping the boiler and with a minimum number of repair operations.

The technical problem is solved by the fact that the furnace with a movable bottom contains a frame formed by longitudinal lower and upper beams with racks between them, installed along the length of the frame, on the upper beams there is a section with support beams intended for installing a combustion chamber, a water-cooled non-dip grate, means for moving and shoving fuel, a hopper with a feeder and a drive, characterized in that it additionally contains a movable bottom, made with the possibility of longitudinal movement relative to the frame, the movable bottom is made in the form of a frame with a stoker floor, a water-cooled non-dip grate is placed on the frame in series with the stoker floor , at the same time, the support beams for installing the combustion chamber are made with windows located on the support beams in pairs and opposite to each other, the means for moving and shuffling the fuel is a screed bar, each screed bar is equipped with hollow bodies at the ends, which led into the windows of the support beams and detachably fixed in them.

Additionally, in the claimed device, the supporting beams for installing the combustion chamber of the furnace are lined with refractory reinforced concrete, which leads to an increase in operational reliability.

The water cooling of the screwing bars and the water-cooled non-dip grate are made independent of each other.

Comparison of the claimed utility model with the prototype shows that it differs in the following features:

additionally contains a movable bottom, made with the possibility of longitudinal movement relative to the frame;

the movable bottom is made in the form of a frame with a stoker floor;

water-cooled non-dip grate is placed on the frame in series with the stoker floor;

support beams for installing the combustion chamber are made with windows located on the support beams in pairs and opposite to each other;

a means for moving and shoving fuel is a shaving strip;

each screwing bar is equipped with hollow bodies at the ends;

hollow bodies are brought into the windows of the support beams and detachably fixed in them.

Therefore, it can be assumed that the claimed utility model meets the criterion of "novelty".

The utility model can be manufactured using known equipment, so it meets the criterion of "industrial applicability".

In FIG. 1 shows the complete firebox,

in fig. 2 shows the screw bar,

in fig. 3 shows the movable bottom,

in fig. 4 shows a water-cooled non-dip grate,

in fig. 5 shows a cross section of a stoker floor tooth.

The device contains a frame formed by longitudinal lower beams 1 (Fig. 1) and longitudinal upper beams 2, between which there are racks 3 along the length of the device. On the upper beams 2 there is a section with support beams 4 for installing the combustion chamber of the furnace. For loading and supplying fuel, the furnace is equipped with a hopper 5 with a feeder 6. The design of the furnace provides for a single movable bottom, which is located under the hopper 5 and under the combustion chamber of the boiler, and has the ability to reciprocate using a drive (not shown in the figure) on wheels 7, which are fixed on racks 3. The movable bottom (Fig. 3) is assembled on a separate frame 8, which is placed inside the frame along its length and rests on wheels 7 mounted on racks 3. A stoker floor 9 with teeth 10 ( Fig. 5), the continuation of which is a water-cooled non-dip grate 15 (Fig. 4), connected to a water source through pipelines17. The upper beams 2 have a section with support beams 4, which are lined with refractory reinforced concrete to install the combustion chamber. Support beams 4 are made with windows 11, which are arranged in pairs and opposite to each other. On the support beams 4 above the frame 8, there are screw bars 12 (Fig. 2). Each screw bar 12 is a trihedral hollow bar at both ends of which there are hollow bodies 13 and 14, equipped with fittings 15, 16, for connecting water supply pipelines to the screw bar 12. All screwing strips 12 with their hollow bodies 13,14 are brought into the corresponding windows 11 of the support beams 4 and detachably fixed in them, for example, using bolted connections or other similar fasteners. In the frame under the water-cooled non-dip grate 15, space is provided for installing a blast duct and organizing air supply.

The device works as follows.

Fuel in the form of coal is loaded into the bunker 5. Then, by means of a drive, the movable bottom is set in motion in the form of a frame 8 on wheels 7. During the reciprocating motion of the frame 8, the teeth 10 of the stoker floor 9 are removed from the bunker through the gap of the feeder 6 portions of the fuel that enter on the water-cooled non-dip grate 15. Since the water-cooled non-dip grate 15 also performs reciprocating motion, the shaving bars 12 located above the water-cooled non-dip grate 15 move portions of the burning and withdrawn fuel from the hopper 5.

A feature of the design of the furnace is that in case of failure of any screw bar 12 during the operation of the furnace, it is enough to disconnect the water supply pipes from the fittings 15 and 16, loosen the fastenings of the hollow bodies 13,14, remove the failed screw bar 12, and replace it with a new one in reverse order. Such a replacement is carried out without stopping the boiler furnace with a minimum number of repair operations in a short time and only when the drive of the moving bottom is turned off for a short time.

Thus, the claimed utility model improves the maintainability of the proposed device.

Claims (4)

1. A furnace with a movable bottom, containing a frame formed by longitudinal lower and upper beams with racks between them, installed along the length of the frame, on the upper beams there is a section with support beams designed to install a combustion chamber, a water-cooled non-dip grate, a means for moving and fuel, a bunker with a feeder and a drive, characterized in that it additionally contains a movable bottom, made with the possibility of longitudinal movement relative to the frame, the movable bottom is made in the form of a frame with a stoker floor, a water-cooled non-dip grate is placed on the frame in series with the stoker floor, while the support beams for installing the combustion chamber are made with windows located on the support beams in pairs and opposite to each other; detachably fixed in them. 2. A furnace with a movable bottom according to claim 1, characterized in that the support beams for installing the combustion chamber are lined with refractory reinforced concrete. 3. A furnace with a movable bottom according to claim 1, characterized in that the hollow bodies of the screwing bar are equipped with fittings for connecting water supply pipelines. 4. A firebox with a movable bottom according to claim 1, characterized in that the movable bottom in the form of a frame with a stoker floor is driven and rests on wheels mounted on racks.

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