RU2646524C1 - Water tube boiler - Google Patents

Abstract

FIELD: heat engineering.

SUBSTANCE: invention relates to heat engineering. Water-tube boiler comprises a combustion chamber, a front and a back wall, supply and return tubes, a gas flue and a heat exchanger, formed of finned tubes arranged in a parallel position to each other. Finned tubes are welded to both walls and located along the perimeter of the combustion chamber in one row and connected in zigzag fashion by drainages to form a single water path.

EFFECT: invention is aimed at reducing the number of drains and eliminating the boiler from airlocking.

1 cl, 6 dwg

Description

The invention relates to the field of heat engineering and can be used to produce heat or steam.

A well-known boiler is a water pipe with forced circulation, containing a combustion chamber, rear and front walls, a gas duct and a water pipe heat exchanger formed by horizontal finned tubes parallel to each other directly in the furnace around the circumference (patent RU No. 2559109, class F24H 1/00, publ. 08/10/2015).

The disadvantages of the known boiler are the complexity of its manufacture, due to the complexity of welding the reversal bends of the heat exchanger, the need to produce a complex metal-intensive opening cover and the difficulty of removing air and draining water from the heat exchanger. The large dimensions of the boiler and, as a consequence, the large metal consumption lead to a rise in price of the boiler and low competitive ability in the market.

A technical problem is the expansion of the arsenal of technical means with the elimination of these shortcomings. The technical result, the achievement of which the present invention is directed, is to create a device of increased reliability and efficiency with reduced manufacturing costs.

This problem is solved, and the technical result is achieved due to the fact that in the boiler containing the combustion chamber, the back and front walls, supply and return pipes, a gas duct and a heat exchanger formed from finned tubes parallel to each other, finned tubes are welded to both walls are located along the perimeter of the combustion chamber in one row and are connected in zigzag taps with the formation of a single water path. Due to the fact that the heat exchanger consists of separate parts that can be manufactured separately on the conductor, welding of finned tubes has been greatly simplified, which, unlike the prototype, is fastened directly to the front and rear walls without additional welding to the position plates. With this design, it is possible to manufacture a heat exchanger with one row of pipes located around the combustion chamber not only around the circumference. It also became possible not to make a laborious and metal-intensive front cover, reduce the number of drains and air vents and solve the problem of boiler airing.

In FIG. 1 shows a perspective view of the boiler, front view.

In FIG. 2 - perspective view of the boiler, rear view.

In FIG. 3 is a side view.

In FIG. 4 is a rear view.

In FIG. 5 is a front view.

In FIG. 6 - node A in FIG. 5.

The water tube boiler contains a combustion chamber 1, a heat exchanger 2, a front wall 3, a rear wall 4. The heat exchanger is formed of welded to both walls and parallel to each other along the perimeter of the combustion chamber in one row of finned tubes 5 and contains a cooled chamber 6. The boiler is equipped with air vents 7 and drains 8. Hot water from the boiler enters the consumer through the supply pipe 9 and returns back to the boiler through the return pipe 10.

The proposed boiler with forced circulation as part of a boiler installation (not shown) works as follows. Fuel and air are supplied through the burner 11 to the combustion chamber 1, where the fuel burns with heat. The combustion products are cooled in a heat exchanger, transferring heat through the body of the pipe and fins, on which reflectors 14 are mounted (Fig. 6), causing the combustion products to work out as efficiently as possible, then are removed into the chimney (not shown). The heat received during the combustion of fuel is absorbed by water through the heating surfaces. The coolant through the return pipe 10 enters the cooled chamber 6. Then, through the bends 12 (Fig. 2) it enters parallel flows from the finned tubes 5, through which it moves, turning around in the bends 13, gradually heating from the combustion products to the desired temperature, and is removed from the boiler to the consumer through the supply pipe 9. This design avoids airing the boiler during operation, has the same water speed in the pipe system and reduces thermal and hydraulic scans in the circuit.

Replacing the supply pipe 9 to the return pipe 10, that is, changing the direction of movement of the coolant, does not affect the operation of the boiler.

Optimum speeds of movement of water allow to avoid an overheat of water and metal. During operation, after stopping the boiler, drainage 8 opens to empty it, and when filling it with water, air vents 7 open (with closed drainages 8).

Thus, the use of a furnace and convection part in a single water path in the proposed boiler makes the hydraulic circuit of the boiler optimal, simplifies its design and manufacture through the use of simple, similar elements, reduces the boiler’s metal consumption and increases operational reliability and economy in operation compared to the prototype, makes it possible to create many variants of the same type boilers of various capacities.

Claims (1)

A water tube boiler containing a combustion chamber, front and rear walls, supply and return pipes, a gas duct and a heat exchanger formed of finned tubes parallel to each other, characterized in that finned tubes are welded to both walls, are arranged along the perimeter of the combustion chamber in one row and zigzag connected by bends with the formation of a single water path.

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