DE1244200B - Forced flow boiler with welded pipe walls - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Int. Cl .:

F22b

German KL: 13 g-7

Number: 1244 200

File number: D 443 801 a / 13 g

Filing date: May 9, 1964

Opened on: July 13, 1967

The invention relates to forced flow boilers with welded pipe walls, which flowed through from parallel, there are vertical pipe registers connected by downpipes, whereby the flow takes place in opposite directions.

In large boiler construction, the development is leading to welded pipe walls. This is as long as that is out vertical pipe registers existing pipe walls in the evaporation area, no big problem, because here the temperature differences between two adjacent pipes are practically zero. at the boiler sizes currently being built with the required pressures, especially for once-through boilers, However, the evaporation areas are very small, so that only a small part of the wall heating surface can be welded. So a way has to be sought that makes it possible, regardless to weld the pipes of the wall register to one another on the medium present in the pipes. To do this, the following conditions must be met:

1. A mean temperature that is as uniform as possible between two pipes in the horizontal section of the Boiler.

2. Temperature difference between two adjacent pipes not greater than 50 ° C.

3. Slight heating misalignments to prevent instability or backflow at low loads.

4. Adaptation of the mass nuts to the heating.

5. General applicability for all types of firing and boilers.

The invention aims to create a pipe assembly which meets the requirements for Welding the pipes from pipe walls in a technically and economically optimal manner is sufficient. the The solution to the problem is that the vertical pipe register are in a comb-like manner in one another and form a common pipe wall. This results in an equal stretch over the length and width of the heating surfaces, since the temperature differences that still occur are negligibly small. The advantages of such an arrangement are also that a smaller number of collectors is required and results in approximately twice the height or length of the heating surface without this a greater temperature difference occurs.

Forced flow boilers are already known with tubular registers connected one behind the other in the direction of flow. However, there is a risk that uneven stretching will occur over the entire width and length, which can lead to bulging of the walls. Furthermore, forced-through-once-through boilers are welded
Pipe walls

Applicant:

German Babcock & Wilcox steam boiler works Aktien-Gesellschaft, Oberhausen (RhId.)

Named as inventor:

Peter Schaloske, Oberhausen (RhId.)

Running steam generator known, which consists of parallel flow, connected by downpipes vertical Pipe registers exist, with the flow taking place in opposite directions. Here it flows Work equipment in one pipe arrangement from the center in two partial flows outwards, in the other accordingly in two partial flows from the outside to the inside. Such arrangements of pipe registers however, obviously have the major disadvantage that the maintenance of the smallest possible temperature difference between the pipes of the pipe register is not possible, since the individual pipe registers are next to each other rather than in a comb-like manner, as in the subject matter of the present invention.

Further details and advantages emerge from the illustrations, which in principle show the arrangement of the pipes and registers point with the heating surface flowing through from bottom to top, whereby the pipe register are in a comb-like manner and, of course, corresponding variants are possible, for example with flow from top to bottom, without departing from the concept of the invention. It shows

Fig. 1 is a view of a schematic arrangement according to the invention,

F i g. 2 side view of an arrangement according to the invention with collectors.

The medium to be heated is initially divided between lines 1 and 2 and passes through the corresponding lines Collectors 3 and 3 ', which are at opposite ends of a pipe wall, into the pipe register 4 and 4 ', which like the other pipe registers 5 and 5', 6 and 6 'etc., the walls of a Cover the combustion chamber. The collectors arranged at the inlet and outlet ends of the pipe registers are, as in particular from FIG. 2 can be seen, arranged outside the combustion chamber. The

709 610/67

After flowing through the pipe registers 4 and 4 ', the warming medium enters the lower headers of the pipe registers 5 and 5', in which it rises upwards in the direction of the arrow and then enters the pipe registers 6 and 6 'and the following 7 and T in a corresponding manner . After leaving the last-mentioned pipe register, it is fed via their upper outlet headers to the inlet headers, pipe registers 8 and 8 ', 9 and 9' as well as 10 and 10 'and 11 and 11' arranged accordingly higher. From this scheme, which can be repeated as often as desired, it can be seen that the individual pipe registers 4 and 7 ', 5 and 6' etc. lie in a comb-like manner and, as a result of this arrangement, only small temperature differences occur between the individual pipes in the pipe registers. Warping and bulging of a welded pipe wall is practically no longer possible.

The conditions set at the beginning for the welding of pipes to pipe walls and registers are fulfilled by the arrangement according to the invention in an ideal manner. For the temperature difference Between two adjacent pipes, the heating in the heating surface is decisive, i. H. at a Given the permissible temperature difference, the heating in the heating surface must not exceed this value exceed. In the middle of the heating surface, the pipe registers 5 'and 6' and in the upper part 9 and 10 to each other. This ensures that the same temperature difference is achieved at the interface between the pipe register is present between the adjacent pipes, as in pipe registers 9 'and 10 and 9 and 10 'on the one hand and 5 and 6' and 5 'and 6 on the other hand. In certain combination cases this is Temperature difference 0.

The connection of the entire lower heating surface, consisting of the pipe registers 4 and 4 ', 5 and 5', 6 and 6 'as well as 7 and 7' with the correspondingly formed overlying heating surface is done by combing the outlet-side and inlet-side ends of the pipe register with each other, whereby in each case Comb the ends of the pipe registers 6 and 7 and 6 'and T of the lower heating surface with the ends of the pipe register 8 and 9 and 8' and 9 'of the upper heating surface. This ensures that the maximum permissible temperature differences between adjacent pipes of the pipe register are not exceeded in this area either.

The individual pipe registers should not exceed a certain length. Temperature imbalances between the individual registers are expediently arranged at the entry of the register, known throttle valves 12 and 12 ', etc. compensated.

The mass flows are adapted to the heating by changing the number of pipes in the individual pipe registers. The arrangement of the registers allows each firebox in a horizontal position Touching direction through a corresponding plurality of tubing strings, being in the vertical direction the height of the heating surfaces due to the permissible temperature difference between two neighboring ones Pipes is determined. As the boiler output increases, the number of pipe registers in a heating surface increases and the number of pipe strings increases until the number of pipe registers equals the number of strings is.

Claims (3)

Patent claims: 1. Forced flow boiler with welded pipe walls, which consist of vertical pipe registers connected by means of downpipes, with parallel flow, the flow taking place in opposite directions, characterized in that the vertical pipe register (4, 4 ' to 11, 11') lie in a comb-like manner and a common pipe wall form. 2. once-through boiler according to claim 1, characterized in that in per se known Way at the entrance to the register (4,4 'etc.) throttle valves (12,12' etc.) are arranged for Adjustment of temperature imbalances. 3. once-through boiler according to claim 1 and 2, characterized in that when superimposed Pipe walls the outlet-side and inlet-side ends of the pipe register with each other comb. Considered publications:
German Patent No. 911264;
German Auslegeschrift No. 1 001284;
U.S. Patent No. 2989036. 1 sheet of drawings 709 610/67 7.67 © Bundesdruckerei Berlin