DE1176155B - Steep tube boiler with an upper, cooled projection on the rear wall - Google Patents

Description

Steep tube boiler with upper, cooled rear wall projection The invention relates to a vertical tube boiler with an upper rear wall projection protruding into the all-round cooled furnace, also cooled, horizontal superheater duct with one in front of and one behind the superheater, formed from wall pipes and with a loosened gas passage in the direction of flow of the Flue gases behind the rear gas outlet and subsequent vertical gas flue.

In order to achieve uniform heating of the contact heating surfaces, it has proven to be useful to swirl the gases in the combustion chamber with one another, depending on the distance from the flame core, before entering the horizontal gas flue by narrowing the gas flow cross-section and deflecting the gases from the direction of flow.

The rear wall projection required for the swirling of the hot gases but has the disadvantage that the space above the projection for Sidewall pipes are lost as a radiant heating surface.

In a known steam generator, they are in the area of the rear wall projection located side wall pipes combined in a collector at the level of the rear wall projection been. However, the steam-water mixture produced must still be fed to the top drum which leads to tangled pipe guides and possibly pipe crossings.

So that all side wall tubes in their entire length up to the upper combustion chamber cover are heated, the rear wall pipes are in a further known steam generator bent into the narrowed gas cross-section and the one in the area of the constriction located side wall pipes sloping upwards and then continued as rear wall pipes and used as a loosened gas passage in the area of the horizontal throttle cable.

With this arrangement, the radiant space is created by the contact heating surfaces and the tubes of the contact heating surfaces are subjected to high temperature loads exposed.

A radiant boiler with a large radiant heating surface in which the The radiant space is free of contact heating surfaces up to the horizontal throttle and which has the advantages of the cooled rear wall projection and also a relatively large one Has contact heating surface, consists according to the invention in that the rear wall projection only from side wall pipes bent from the side walls located in its area is covered, which then form the front gas passage, and that all rear wall tubes passed through the rear wall projection to form the rear gas passage are.

This results in a high level of radiation without contact heating surfaces formed with good heat utilization, with no loss of space above the protrusion for the side wall pipes is to be recorded as radiant heating surface and the side or. Back wall pipes heated in their entire length and bent relatively easily are.

The superheater arranged between the two gas passages is due to the lack of side wall pipes easily accessible from the side and expandable.

In order to further enlarge the boiler heating surface, according to the invention one or more in the horizontal throttle cable in front of and / or behind the rear wall pipes further evaporation heating surfaces can be arranged, which are preferably between over the boiler roof arranged transverse collectors and connected to these by downpipes lower cross distributors are laid.

In addition, two lateral longitudinal drums connected to one another by several cross-headers or a central drum can be arranged above the boiler ceiling, and the pipes that form the front wall, the two gas passages and the evaporation heating surfaces arranged behind them open into these cross-headers. The side wall pipes, which are not in the area of the rear wall projection, can be used for tubing the boiler roof and open into the middle drum or the two longitudinal drums. It is also possible to use the pipes in the front wall to line the boiler ceiling.

Such an arrangement of longitudinal drums and cross collectors is it is possible to have any number of groups of evaporation heating surfaces in the horizontal gas flue to be arranged one behind the other.

The drawing shows an exemplary embodiment of the subject matter of the invention, namely shows . A b b. 1 and 2 show a longitudinal and a cross section of a vertical tube boiler according to the invention, from b. 3 another embodiment, # b b. 4 a horizontal section to A b b. 3, # b b. 5 shows a cross section to A b b. 3 and # b b. 6 and 7 two embodiments with a middle, upper drum.

According to A b b. 1 and 2, 1 is the combustion chamber rear wall in the upper part a projecting into the radiation chamber 2 back wall projection 3. The tubes 4 of the rear wall 1 penetrate the back wall projection 3 and form in the horizontal flue 5 the on-Z, Crelockerten gas passage 4a. The side wall pipes 6 located in the area of the rear wall projection 3 are only led up to the rear wall projection 3 , then serve to cover the underside of the rear wall projection 3 and then form the loosened gas passage 6 a from the radiation space 2 to the horizontal flue gas flue 5. The gas passages 4 a and 6 a open Above the boiler roof in cross-headers 8, which connect the two laterally arranged longitudinal drums 9 to one another. The not located in the region of the rear wall of the projection 3, the side wall pipes 7 serve for the tubing of the boiler top casing and opening 9 in the longitudinal drums in the horizontal flue 5 is between the two gas passages 4 a and 6 a of the superheater 10. Behind the gas passage 4 a, evaporation heating surfaces 11 and 12 are laid as a bundle of tubes between the upper cross-headers 8 and the lower cross-distributors 13 connected to these by downpipes 14.

According to A b b. 3 and 4, the tubes of the front wall 16 of the radiation space 2 are used for tubing the boiler ceiling and open into a transverse collector 8, which connects the longitudinal drums 9 to one another. The gas passage 6 a acts partly as a radiant heating surface, partly as a contact heating surface. The side wall pipes 6, which form the gas passage 6 a , are arranged in the gas passage in such a way that three adjacent pipes 6 are placed one behind the other in the gas passage. A plate superheater 10a is arranged behind the gas passage 6a and then the second gas passage 4a formed by the rear wall pipes 4, the pipes of which open into a transverse collector 8 at the top, together with the pipes of the evaporation heating surfaces 11 arranged behind it. The next evaporation heating surface 12 is designed as a loose contact bundle. The heating surface in the horizontal gas flue is designed in such a way that the free passage cross-section decreases in the direction of flow.

According to Fig.5, the evaporation heating surface12 is between an upper one Cross collector8 and a lower cross distributor13, whereby the upper cross collector8 connects the two longitudinal drums9 with each other, which through the downpipes14 with the lower transverse distributor13 are in connection.

According to Fig. 6, only one longitudinal drum 18 is provided above the boiler ceiling, from which transverse collectors 8 a and 8 b emanate on both sides, into which the tubes of the evaporation heating surface 12 open and from which the downpipes 14 extend.

After Ab b. 7 , part of the tubes of the evaporation heating surface 12 is inserted into the two transverse laminators 8 a, 8 b . while the middle tubes 12 a open directly into the longitudinal drum 18.

The fire gases, which heat the front, 15, side, 6 and 7, and rear wall pipes 4 in the radiation space by radiation, are deflected by the rear wall projection 3 from their vertically ascending direction, at the same time the gas flow cross-section is narrowed. In this way, a turbulence occurs in the individual gas layers of different temperatures depending on the distance from the flame core, which then enter the horizontal flue gas duct 5 through the gas passage 6 a and the superheater 10 or 10 a, the back wall pipes forming the second gas passage 4 a 4 and the other evaporation heating surfaces 11 and 12 heat. The secondary heating surfaces as well as the vertical gas flue adjoining the horizontal flue gas flue are not shown in the drawing.

Since the side wall tubes disposed in the region of the rear wall projection 3 6 are used for the tubing of the underside of the back wall projection 3 and the rear wall tubes 4 constitute a second gas passage 4a in the flue 5, the side walls of the flue gas train 5 via the rear wall projection 3 remain free of pipes, without thereby a reduction in the heating surface occurs. In this way, the superheater 10 or 10 a arranged above the rear wall projection 3 is easily accessible and removable from the side.

By arranging one or two longitudinal drums 18 or 9, which are connected to cross collectors 8 a, 8 b or 8 , it is possible, depending on the length of the drums 18 or 9, to add any number of cross collectors 8 a, 8 b or 8 and thus any number of evaporation heating surfaces to be arranged in the horizontal gas flue 5 in order to adapt the boiler heating surface to the requirements.

The invention can also be applied to two-pressure boilers.

Claims (2)

1. A vertical tube boiler with a protruding in the sides-cooled combustion chamber, also cooled, the upper rear wall projection horizontal überhitzerzug with one arranged in the flow direction of the flue gas behind the rear gas passage upstream and downstream of the superheater, situated formed from wall tubes loosened gas passage and with Auxiliary heating surfaces and subsequent vertical throttle cable, characterized in that the rear wall projection (3) is only covered by side wall tubes (6) which are located in its area and which are bent away from the side walls and which then form the front gas passage (6a), and that all the rear wall tubes ( 4) are passed through the rear wall projection to form the rear gas passage. 2. vertical tube boiler with a central or two lateral longitudinal drums according to claim 1, characterized in that the tubes (15) of the front wall (16), the two gas passages (6a, 4a) and the evaporation heating surfaces (11, 12) arranged behind the gas passage in Cross collectors (8 or 8a, 8b) open, which connect the two longitudinal drums (9) to one another or are connected to the middle drum (18) . 3. Steep tube boiler according to claim 2, characterized in that the evaporative heating surfaces (11, 12) located in the horizontal gas flue (5) between transverse collectors (8 or 8a, 8b) arranged above the boiler ceiling and lower transverse distributors connected to these by drop gauges (14) (13) are relocated. Documents considered: German Patent No. 944 791; British Patent No. 706,965.