RU2689497C1 - Boiler with forced circulation - Google Patents

Abstract

FIELD: manufacturing technology.SUBSTANCE: invention relates to boilers with forced circulation. Boiler with forced circulation contains furnace chamber from screen tubes and located behind it convective part, which consists of several packets in-series connected in parallel to each other and arranged in rows of vertical ribbed pipes welded from both ends to top and bottom respectively to horizontal manifold to form common water path together with furnace chamber tubes.EFFECT: invention is aimed at simplification of labor intensity of manufacturing and repair and increase of efficiency of boiler.1 cl, 9 dwg

Description

The invention is intended to produce heat and steam and can be used to create direct-flow steam and hot water boilers.

Known boiler with forced circulation, containing the combustion chamber, made of horizontal pipes, interconnected by collectors, and the convective part (patent RU №2362094 class F24H / 12, publ. 20.07.2009).

The disadvantage of the known boiler with forced circulation is the complexity of its manufacture and repair, due to the large number of welding and assembly work. As well as insufficient efficiency due to not optimal distribution of coolant temperatures relative to flue gases.

The technical problem is the elimination of the noted deficiencies. The technical result is to simplify the complexity of manufacturing and repair and increase with the efficiency of the boiler.

The problem is solved, and the technical result is achieved due to the fact that the forced circulation boiler contains a combustion chamber of screen tubes and a convective part located behind it, which consists of several successively connected branches of parallel arranged packets, each made of a series of vertical finned tubes, welded from two ends to the upper and lower respectively to the horizontal manifold with the formation, together with the pipes of the combustion chamber, of a single water path.

FIG. 1 - shows the perspective view of the boiler.

FIG. 2 - front view.

FIG. 3 - axonometry of the furnace part.

FIG. 4 - axonometric view of the convective part without frame.

FIG. 5 - axonometry of the package of the convective part.

FIG. 6 shows section A-A in FIG. 2

FIG. 7 is a section bb of FIG. 2

FIG. 8 is a section view of CC in FIG. 2

FIG. 9 is a node D in FIG. eight.

The boiler with forced circulation contains the combustion chamber 1. and the convective part 2 (Fig. 2 and 4). The combustion chamber is made of screen tubes 3. The convective part 2 consists of several successively interconnected branches of parallel-arranged packages 4 (FIG. 5), each made from a series of vertical finned tubes 5, welded from two ends to the upper and lower respectively to the horizontal collector 6 with the formation, together with the pipes of the combustion chamber, of a single water path

The boiler is equipped with air 7 and 8 drainage cranes. Hot water from the boiler enters the consumer through line 9 and returns back to the boiler through line 10.

The proposed boiler with forced circulation in the composition of the boiler room (not shown) works as follows. Fuel and air are fed through the burner 11 into the combustion chamber 1, where the fuel is burned with heat. Combustion products are cooled in the convective part 2 and ejected into a chimney (not shown). The heat obtained during the combustion of fuel is perceived by water through the heating surfaces of the collectors 6, the screen tubes 3, and the finned tubes 5 of the convective part 2.

Partitions 12 (Fig. 1 and 7) installed in the collectors 13, force water to change the direction of movement along the screen tubes, as shown by the arrows. Partitions 12 in the collectors 13 are located so that the water flows are directed through the same number of pipes 3. This allows you to have the same water velocity in the screen tubes, thereby reducing thermal and hydraulic sweeps in the furnace part.

The coolant from the consumer enters through the trunk 10 into the upper collector 6 of the outermost package 4 of the convective part, then heating in finned tubes 5 closed on the outside with reflective plates 14 (FIG. 9) to increase heat transfer from the pipe fin and uniform distribution of the flue gases over the section convective part, moves to the lower manifold 6 of packet 4, where through the taps 15 it enters the next packet from the finned tubes and, similarly as in the first packet, the coolant moves through the finned tubes 5 only along the direction The upward direction already goes to the upper collector 6, where through the taps 15 it enters the next package 4 nearest to the furnace. The coolant moves sequentially through all the packages (the number of packages is determined for each type of boiler size) arranged parallel to each other and from the collector 6 near the package It also moves to the combustion chamber through the taps 15 into the screen tubes of the combustion chamber, where, when heated to a predetermined temperature, it is fed to the consumer through the supply connection. Due to oncoming flows of flue gas and heat carrier temperatures in the convective part, as well as a large surface area of the convective part, due to the finning of the tubes arranged in a staggered manner, the maximum heat transfer effect and correspondingly high efficiency are achieved.

During operation, after stopping the boiler, drainage taps 8 open to empty it, and when filled with water, air taps 7 open (with closed drainage taps)

Thus, the design of the boiler makes it possible to compactly place a large surface of the heat transfer surface with the possibility of good circulation of coolant with oncoming flows of flue gas and water temperatures. All this, respectively, significantly increases the efficiency. Simplifies its design, improves maintainability and efficiency in the work compared with the prototype; allows you to create a variety of variants of the same type of boilers of different power.

Claims (1)

A forced circulation boiler containing a combustion chamber of screen tubes and a convective part located behind it, characterized in that the convective part consists of several successively interconnected branches of parallelly arranged packages, each made of a series of vertical finned tubes welded from two ends to the upper and lower, respectively, horizontal collectors with the formation, together with the pipes of the combustion chamber, of a single water path

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