DE1971546U - CONTINUOUS STEAM GENERATOR. - Google Patents

Description

Dipl.-Ing. WOLFHAM WATZKE Dipl.-Ing. ALEX STENGER

PATENTANWÄLTE 4 = DÜSSELDORF 1 CHARLOTTENSTKAS S E 58 TELEPHONE (0211) 360514/15 8516-b

Our sign, date: ^ _{Jul ±}

Dürrwerke Aktiengesellschaft, Ratingen Continuous steam generator

The innovation concerns a once-through steam generator rotationally symmetrical combustion chamber and perpendicular Radiation space, with the vertical combustion chamber is bounded by a group of cooling tubes that run in ascending helical turns.

In the case of such once-through steam generators, the adjustment is to high performance and different operating conditions made difficult by the need to remove the cooling tube walls to train gas-tight and the same flow conditions in parallel cooling tubes and one to achieve a better effect of the cooling pipes in the radiation room.

It is already known to connect several vertical combustion chambers to a common, ascending radiation space.

close, whereby this measure serves to better subdivide the combustion output. It is on the other hand known to provide the radiation space downstream of a combustion chamber with partition walls or in two to subdivide parallel flows of radiation.

The innovation was based on the task of a once-through steam generator of the type described for high performance while maintaining the rotationally symmetrical wall of the Combustion chamber to subdivide the flue gas, with approximately the same flow resistances in the cooling pipes achieved and uneven heat movements should be avoided to endanger the tightness of the jacket turn off.

For this purpose it is proposed according to the innovation to divide the radiation space into two or more of the fire gases to divide parallel through-flow radiation trains, each of which by a group in the flow-through parallel and cooling tubes that are welded to one another in a gas-tight manner and are wound approximately parallel to one another in an ascending manner.

In the case of a once-through steam generator designed in this way, the boundary wall has only the slightest differences in thermal expansion exposed, so that the stiffest form of the boundary wall j namely the gas-tight welded one Pipe wall, can be used. The pipes connected in parallel with regard to the flow of working medium show only slight temperature differences in relation to one another due to the increasingly sinuous arrangement on, even if the temperature of the working medium increases in the direction of flow. The top pipe of the sinuous The pipe band has a temperature difference compared to the bottom pipe of the following turn, which is the case when it is subdivided of the radiation space into two parallel radiation paths due to the shorter length of a turn can be mastered with the known means of elastic connection and in most cases still allows a tight weld.

According to further features of the innovation, the tube groups of the radiation trains within the combustion chamber should be designed as a known fire gas outlet tube with a total of circular cross-section _s which is divided by double-layer partition walls into several, perpendicularly parallel sections, which in cross-section one of the

Number of radiation trains have a corresponding shape of a segment of a circle. Preferably, each Strahlungszug is outside of the combustion chamber in law cross-section from the circular cutout transferred into a rectangle ₅ by the respective tube group is angled accordingly while maintaining the increasing winding. According to a further feature of the innovation, the tube groups of the radiation trains are designed as a continuation of the helically wound tube band that forms the combustion chamber.

The radiation paths can be designed spatially independently of one another so that they are freely accessible from all sides. But you can also have a common wall, which does not have to be completely gas-tight if the other outer walls together form a closed and gas-tight jacket. In the latter case, the design of the partition walls can be designed differently, for example without a slope and without gas-tight welding. I _n the other case can connect the partition walls at a common partition wall between two parallel contact trains. By reshaping the almost square cross-section of a beam

area to two rectangles with the same content, 50% of the radiation area is gained. In particular, ' there is the advantage that, due to the increasing winding of the tubes combined into tube groups, Partial loads do not result in instabilities as a result of the lowered furnace and that a cheap production is possible.

In the drawing, an embodiment of the innovation is shown, namely shows

Figure 1 is a vertical section through a schematically illustrated once-through steam generator of the innovation,

Figure 2 shows a vertical section through the lower part of the steam generator with the cooling pipe routing drawn in,

Fig. 3 shows a horizontal section along section line A-B in Fig. 2 and

Fig. 4 shows a horizontal section along section line G-D in accordance with Fig. 2.

The one equipped with a rotationally symmetrical combustion chamber 1 Steam generator has two radiation trains 3 and 4,

which emanate from a common flue gas outlet pipe 2. These radiation flues 3 and A can be brought together in front of the contact heating surfaces to form a common flue are or by means of a dash-dotted intermediate wall 5 in a known manner as individually controllable Trains 6 and 7 are continued, whereby the control is carried out if the superheater heating surface is unevenly distributed on both trains the steam temperature is facilitated.

The walls of the combustion chamber I _{5 of} the flue gas outlet pipe 2 and of the radiation flues 3 and consist of ascendingly wound strips of pipes that are gas-tight welded to one another and connected in parallel in the flow, as can be seen more clearly in Figure 2.

According to Figure 2, this is from the one not shown, in the touch cable feed water preheater located several (according to Figure 3, for example twelve) incoming water in parallel switched distributors 8 supplied. The water flows from the distributors in cocurrent through the outgoing ones Pipe bands 9, each consisting for example of eight cooling pipes, which are connected in parallel and in known

Way are welded gas-tight to one another directly or with the interposition of webs. This results twelve helically ascending tubular belts 9, the form the bottom, the jacket and the ceiling of the combustion chamber 1. The division into several connected in parallel Pipe straps 9 facilitate manufacture, since a pipe wall of eight are welded to one another over the entire length Cooling tubes are manufactured as a flat tube wall and, after welding, are bent on a kind of tape winding machine can without the fear of breaks or cracks in the weld seams. In addition, it is easier to use a multi-course, for example two-course helix that End surfaces to be filled in than with a catchy one. Furthermore, the temperature difference in the top pipe of the Tape opposite the lowest tube of the one above Tape only a corresponding fraction, so that it allows the gas-tight welding of the pipes to one another. In the case of the conical spiral, as it occurs in the floor and in the ceiling of the combustion chamber 1, the slope is changed, whereas the winding step remains unchanged.

The pipe bands 9 open out at the upper end of the combustion chamber ceiling in twelve collectors 10, from which the water to be evaporated through twelve groups of connecting pipes 11 to twelve distributors 12 arrives, of which twelve pipe belts 13? go out, initially the star-shaped Form twist / breaker 14, as can be seen in Figure 4 the pipe bands 9 are divided into two pipe groups 15 and 15, which together form the jacket 17 of the flue gas outlet pipe 2 result. Here, the division of the radiation space is prepared by adding six each as shown in Figure 4 Bands after 180 circumferential angles radially and horizontally traverse the flue gas outlet pipe 2 and thus form a two-layer partition 19, 20 inside the flue gas outlet pipe 2 does not have to be completely gas-tight.

After separating the radiation lines 3 and 4 (see Figure 3), each partition 19 and 20 forms an outer wall, so that it must also be made gas-tight. Here it is included again in the winding step, so that each radiation train 3 and 4 consists altogether of cooling tubes which are wound parallel to one another and ascending. The cross section the radiation paths 3 and 4 is in the illustrated embodiment from the semicircular shape to the right

.,. AQ

corner shape transferred.

In the ceiling of the combustion chamber 1 burners 18 are arranged in a known manner, which generate a flame ₅ which runs downwards in helical turns, reverses at the bottom of the combustion chamber 1 ^ when entering the flue gas outlet pipe on the walls of the swirl breaker 14 and loses its twist is distributed in parallel flow to the radiation trains 3 and 4. If a partition 5 is present, as shown in Figure 1 , the distribution can be regulated with the aid of throttle valves 21, 22.

Claims (4)

■ 7/14/67 Protection claims: 1, once-through steam generator with rotationally symmetrical Combustion chamber and vertical radiation space, with the vertical combustion chamber through a group of Cooling tubes are limited in ascending screw turns run, characterized in that the radiation space is divided into two or several radiation trains (3, A) through which the fire gases flow in parallel, each of which is divided by a group (15, 16) in the flow of cooling tubes connected in parallel and welded to one another in a gastight manner which are wound parallel to each other in an increasing manner. 2. Steam generator according to claim 1, characterized in that that the tube groups (15, 16) of the radiation passes (3, 4) within the combustion chamber (1) are known per se Fire gas outlet pipe (2) of generally circular Cross-section are formed by double-layered Partition walls (19, 20) in several, in the vertical direction is divided into parallel sections, the cross-section of which corresponds to the number of radiation trains (3, 4) Have the shape of a segment of a circle. 3. Steam generator according to claim 1 and 2, characterized in that each radiation train (3, 4) outside the combustion chamber (l) merges in cross section from the circular segment to a rectangle by the respective tube group (15 or 16) while maintaining the rising wick is angled accordingly. 4. Steam generator according to claim 1 to 3, characterized _s that the tube bundles (15,16) are formed of the radiation trains (3,4) as a continuation of the combustion chamber (1) forming helically wound pipe bands (9). -U / Bra- List of reference numbers see 1 Combustion chamber 2 Flue gas outlet pipe 3 S t ra hlung s train A. S t ra hlung s train 5 Intermediate wall 6th train 7th train 8th Distributor 9 Pipe tape 10 Collector 11th Connecting pipe 12th Distributor 13th Pipe tape 14th Swirl breaker 15th Tube group 16 Tube group 17th coat 18th burner 1Θ partition wall 20th partition wall 21 throttle 22nd throttle -U / Bra-