DE2144675C3 - Continuous steam generator - Google Patents

Description

The invention relates to a mk pulverized coal firing tu operating large steam generator as a continuous steam generator is designed, .lit subdivision of the combustion chamber by at least one parallel to the External walls through which work equipment flows, a partition wall with a controlled or regulated Distribution of the working medium flow to the heating surfaces of the partition wall and the outer walls takes place in such a way that that at the exit of the partition heating surface there is essentially saturated steam temperature, while in the Outer wall heating surfaces a higher level of warming takes place corresponding to the steam generator load.

Such a steam generator corresponds to that of the earlier patent application P 21 32 454.9.

The present invention is based on the object of providing a particularly advantageous circuit for the dividing wall heating surface to be specified for large steam generators.

This object is achieved in that the steam outlet from the upper end of the Partition wall is connected by downpipes with passage collectors, which belong to the outer wall heating surfaces and are interposed behind a heating surface section of the outer wall, where a transition to A larger number of parallel pipe runs takes place. In this way, if the Working means in the outer wall heating surfaces in the upper area of the same an increased flow be accomplished with the work equipment, since there it is not the partial flow, but the full work flow can be used to avoid excessively high heat loads in this heating surface section to counteract.

This measure can be used with steam generators both with one train and with two trains perform accordingly. In the case of steam generators with a single train, the partition wall is created by the convection heating surfaces pulled through upwards, while two or more puffs through the steam generator ceiling Furthermore, the invention is primarily of importance for steam generators with the training Outer wall heating surfaces as a helical winding and is particularly suitable for a design in which the The helical winding ends in about two thirds of the height of the combustion chamber and behind a passage collector is continued by vertical tubing.

ίο In addition, means can be provided to the

To control mass flow through the partition wall or to

regulate that the enthalpy at the exit of the partition is the same as at the passage collector.

The invention is to be described in greater detail on the basis of the drawing

explained. The figures show an embodiment in its essential parts for the invention in a greatly simplified, partly schematic representation.

As shown in FIG. 1 can be seen, is the work equipment

promoted with the feed pump 7 through the economizer heating surface 8, in front of or behind this heating surface the working fluid is divided into two partial flows. Using the as a control or regulating valve working valve 9 is the mass flow to the outer wall heating surfaces, through which in the same way Acting valve 10 influences the mass flow to the partition heating surface. While on the valve 9 in In most cases, throttling with the aid of valve 10 could be dispensed with

so required. The firebox partition is in the illustrated embodiment by the vertical Tubes provided heating surface 4 symbolizes, its inlet manifold with 5 and its outlet collector is denoted by 6. Correspondingly, of course, several combustion chamber partition walls can also be used instead of a single one be provided of this type.

The outer wall heating surfaces are in the one shown Embodiment formed by a helical winding 51 with an inlet manifold 52, but which does not extend over the entire height of the furnace, but ends at an intermediate collector 53, from where vertical pipes 54 to an outlet collector 55 are carried up. The steam escaping there arrives via lines 56 to a

Mixing vessel 57 and from there to a superheater heating surface 24.

The steam generated in the heating surface 4 is according to the invention in the passage collector 53 of the Outer wall heating surface, with suitable cases

M pipes 58, 59 and 60 for removing the steam from the outlet collector 6 of the combustion chamber partition wall to the Watch passage collector 53 of the outer wall heating surface. The mass flow through the partition can be regulate by adjusting the valves 9 and 10 so that the enthalpy of the steam in the outlet header 6 is the same as that of the steam in the passage collector 53. In this way the will be perpendicular guided pipes interspersed with the full amount of working fluid.

In the F i g. 2 and 3 is perpendicular to each other in two running sectional views the pipe guide in Area of the passage collector 53 illustrated in more detail. As the illustration shows, the Passage collector 53 the sloping pipes

f> 5 61 of the helical winding vertically upwards bent, with short pieces of pipe 62 extend vertically upwards. At point 63 these tubes are like can be seen in particular from Fig. 3, downwards (stretch

ken 64) to the passage collector 53. From the passage collector 53, branch pipes 65 are made , which get back to point 63, from there as vertical pipes 66 to the upper outlet header 55 in the sense of the vertical tubes 54 (FIG. 1). Also are in the gaps between the raised Pipe sections i52 each upwardly leading pipes 67 and 68 interposed in this way a gas-tight welded closure is facilitated with the help of fin tubes The downpipes 58, 59, 60 from the heating surface 4 open into the passage collector 53 from above.

For this purpose 2 sheets of drawings

Claims (2)

Patent claims: 1. Large steam generator to be operated with pulverized coal firing, which is a once-through steam generator is designed, with subdivision of the combustion chamber by at least one parallel to the External walls through which work equipment flows, a partition wall with a controlled or regulated Distribution of the working medium flow to the heating surfaces of the partition wall and the outer walls like this takes place that at the exit of the partition wall heating surface there is essentially saturated steam temperature, while in the outer wall heating surfaces a higher one corresponding to the steam generator load Warming takes place, characterized that the steam emerges from the upper end of the partition (4) through downpipes (58,59,60) is connected to passage collectors (53) which belong to the outer wall heating surfaces (51, 54) and behind a heating surface section (51) of the outer wall are intermediate where a transition occurs a larger number of parallel pipe runs takes place. 2. Large steam generator according to claim!, Characterized in that the passage collector (53) between a section with a helical winding (51) and a section with a vertical bore (54) is arranged.