RU2639438C1 - Boiler with forced circulation - Google Patents

Abstract

FIELD: heating system.SUBSTANCE: boiler with forced circulation contains combustion chamber, gas duct and heat exchanger, while the chamber is formed by curved finned tubes, arranged parallel to one another and united in collectors, in which partitions with holes are installed.EFFECT: achieving optimum hydraulic circuit of the boiler and its design is simplified and through the use of simple, similar items boiler metal intensity is reduced and reliability and efficiency in work is enhanced compared with the prototype, that provides the ability to create a variety of options of the same type of boilers of different capacity.9 dwg

Description

The invention relates to the field of heat engineering and can be used for heating buildings for communal household and industrial purposes, having a heating system with a coolant.

Known boiler with forced circulation, containing a combustion chamber, rear and front walls, a gas duct and a water tube heat exchanger formed by horizontal finned tubes parallel to each other directly in the chamber around the circumference (patent RU 2559109 C1, CL F24H 1/00, publ. 10.08 .2015).

A disadvantage of the known boiler is the complexity of its manufacture, due to the complexity of welding the reversal bends of the heat exchanger, the large dimensions of the boiler and, as a result, the large metal consumption, which leads to a rise in the cost of the boiler and low competitive ability in the market.

The technical problem of the invention is the elimination of the noted disadvantages. The technical result, the achievement of which the present invention is directed, is to increase reliability, efficiency and reduce manufacturing costs.

The problem is solved, and the technical result is ensured by the fact that in a forced circulation boiler containing a combustion chamber, a gas duct and a heat exchanger, the chamber is formed by curved finned tubes located parallel to each other and connected to collectors in which partitions with openings are installed.

Due to the fact that the chamber consists of individual parts that can be manufactured separately on the conductor, welding of finned pipes to the manifolds has been greatly simplified;

In FIG. 1 shows a general view of the boiler in a perspective view (with two rows of bent finned tubes).

In FIG. 2 - cross section of the boiler.

In FIG. 3 is a section along AA in FIG. 2.

In FIG. 4 - node B in FIG. 2

In FIG. 5 - node B in FIG. 3.

In FIG. 6 is a section along G-D in FIG. 3

In FIG. 7 is a general view of the boiler in a perspective view (with one row of bent finned tubes).

In FIG. 8 is a cross-sectional view of the boiler of FIG. 7.

In FIG. 9 is a section along DD in FIG. 8.

The forced circulation boiler contains a combustion chamber 1, a convection-convection part 2, a front cooled wall 3, a rear cooled wall 4. The combustion chamber is made of bent finned tubes 5 connected by collectors 6. Vertical partitions 7 are installed in the collectors 6 (Fig. 4 and 5). The boiler is equipped with overhead 8 and 9 drainage taps. Hot water from the boiler enters the consumer through line 10 and returns back to the boiler through line 11 (Fig. 2).

The proposed boiler with forced circulation as part of a boiler installation (not shown) works as follows. Fuel and air is supplied through the burner 12 to the combustion chamber 1, where the fuel burns with heat. The combustion products are cooled in the furnace-convective part 2 and emitted into the chimney (not shown). The heat received during the combustion of fuel is absorbed by water through the heating surfaces; collectors 6, bent finned tubes 5, front wall 3, rear wall 4.

Partitions 7 installed in the manifolds 6 cause the water to change the direction of movement along the bent finned tubes 5, as shown by arrows 13 (Fig. 4). Partitions 7 in the collectors 6 are arranged so that water flows along the same number of bent finned tubes 5. This allows you to have the same water speed in the pipe system, thereby reducing thermal and hydraulic reamers in the circuit.

During operation, after stopping the boiler, drainage taps 9 are opened to empty it, and when filling it with water, air taps 8 are opened (with closed drainage 9). Moreover, in the deaf compartments formed by the partitions 7, the function of the drainage and air valves is performed by the holes 14 in the partitions 7.

It is also possible not to make holes 14 (Fig. 5) in the partitions, if each compartment has its own drainage 9 and air 8 taps.

The presence of 6 vertical partitions 7 in the collectors makes it possible to ensure optimal water speeds, which avoids overheating of water and metal.

With this design, it is possible to manufacture a heat exchanger with one (Fig. 7) or two rows of pipes (Fig. 1) staggered (Fig. 6), which can significantly reduce the dimensions of the boiler and use the heat of the flue gases with maximum efficiency. Due to the bending of the finned tubes, additional structural strength appeared, which allows to increase the length of the boiler and expand the power range.

When designing a boiler with two rows of bent finned pipes, colder water from the consumer is supplied to the outer row of pipes, where it additionally removes the heat of the flue gases. This allows the boiler to be operated efficiently with high efficiency on superheated water without additional installation of an exhaust gas utilizer.

Thus, in the invention, the optimal hydraulic circuit of the boiler is achieved, its design is simplified, and due to the use of simple, similar elements, the metal consumption of the boiler is reduced and the operation reliability and economy in operation are increased compared to the prototype, which makes it possible to create many variants of the same type boilers of various capacities. The invention can be used to create once-through steam and hot water boilers.

Claims (1)

A forced circulation boiler containing a combustion chamber, a gas duct and a heat exchanger, characterized in that the furnace is formed by bent finned tubes parallel to each other and connected to collectors in which partitions are installed.

Images