DE558943C - Coiled tube boiler or superheater or the like. - Google Patents

Description

Coiled tube boiler or superheater or the like. It is known to generate steam or to use for steam overheating o arranged smooth tubes of advantageously the same length and from with the tubes welded elbow pieces of the same shape and size exist. The pipes are there either arranged directly above the combustion chamber, or they can also boilers upstream.

In the case of those that have emerged recently and that work with very high pressures Steam generation systems mean the arrangement of these heat exchangers that has been customary up to now a disadvantage, since the welds are so high temperatures as they are in high pressure systems come into question, may not be put on.

A version is already known in which the hanging, in [) -Form from one piece of bent tubes attached to the top of a common plenum are connected to a heating duct lierumgruppiert and with the [) -bows in an ash bed are embedded in order to protect them from flashes of fire. Furthermore are also known superheater coils in a hanging arrangement, in which the upper Elbow pipe above the boiler roof outside of the flue gas flow and to hold of the pipe coils.

For overhaul of such heat exchangers it was so far as far as they are z. B. with steep tube or inclined tube boilers without breaking open the boiler or boiler house masonry or the roof construction was often necessary, the whole individual snakes or a whole, made up of several connected with each other Completely remove snakes existing tube bundle from the boiler to individual To be able to replace snakes.

In these cases a number of pipe coils must be kept in stock and possibly the cumbersome work of expanding entire elements be accepted. The need to stock entire lines is particularly unpopular if there are different heat exchangers in one and the same company Size or of different types. If one breaks through the boiler or boiler house masonry or the roof structure, it results another disadvantage z. B. with steep tube and inclined tube boilers and the like insofar as than merely for the purpose of removing individual superheater coils or Tube bundles very high boiler house and in some cases coal bunker superstructures required are, which results in a significant increase in the cost of the entire system.

The invention has the purpose of all the disadvantages mentioned so far to avoid the usual arrangement of welded pipe coils, especially in systems, in which the pipes are directly exposed to the hottest gases. This purpose is achieved according to the invention in that the arranged in a known manner from standing smooth tubes of advantageously one and the same length and welded to them short pipe bends of the same shape existing heat exchangers with the upper ones and lower pipe bends next to the welds are arranged outside the fire gas zone and the pipe bends for supporting or suspending the heat exchanger in the manner are used that they are located outside of the fire gas zones, individually removable Support iron supported in this way or suspended in such a way on corresponding support irons are that single snakes from the bundle after detachment from the collecting chambers and after removing a strip of the boundary walls of the Heizgaszuges for the purpose of making accessible of the welds and for the purpose of cutting out and rewelding individual ones straighter. Pipe sections can be lowered and raised.

This first of all has the advantage that the heating surfaces The hottest fire gases can now be used without hesitation can leave, because now not only the pipe bends themselves, but also the welds are withdrawn from the direct influence of these gases.

Another advantage is that you now have the known Version with tubes of uniform length can be used without regard to whether the pipe bends are supported on horizontal or inclined beams or on them are hung. This is because short end sections of the pipes of the same length can be made with the welding points above or below more or less from the fire gas zones in that protrude against these covered spaces. Nothing stands in the way of that lower and upper pipe bends on parallel diagonal supports or diagonally to arrange lying carrying iron. If this also z. B. with regard to the question of space is not desired, you can put the upper or the lower pipe elbows alone into one Lay an inclined line so that only the straight pipe sections are of different lengths. The installation of the entire heat exchanger is also much easier than before, as the individual lines are only welded together at the construction site can.

When using dust or gas firing or the like. You can also go with the support structure under the boiler floor, the structure is comfortable can be designed to be accessible and space and masonry can be saved. As the single snakes resting on or hanging on individually detachable carrying irons, consists in the pipe division and in the width dimension of the heat exchanger no limitation, so that each desired cross-section of the gas passage, possibly in conjunction with the known Fire gas baffles can be chosen.

The simple nature of the construction also enables convenient adjustment to special steam circuits.

Another training of this type is also that the generally smooth-walled firebox through the shelters in which the carriers the pipe elements lying above the grate are accommodated, towards the middle to one Constriction can experience, whereby a good turbulence of the fire gases before the Coating the actual heating surfaces is achieved.

With all types of construction, the replacement is more damaged Pipes much simpler than in the previously known arrangements of such heat exchangers. In order to replace a damaged pipe section, you only need the one in question coming pipe coil detached from the collecting chambers and a corresponding strip the end walls of the fire gas zones as well as that which supports or carries this snake Carrying iron to be removed. You can then put the snake in one below Lower the lying inspection room and place the pipe section to be replaced at the bottom of the Cut the weld, then lift the snake so that the top part is in one upper inspection room, while the pipe section is cut off and pulled out at the top can be. Conversely, a new pipe can be drawn in from above in the same way and welded in first at the top and then at the bottom.

With reference to the drawing are two embodiments of the invention explained in more detail. Fig. I shows a single coil and Fig. A a section according to line A-B of Fig. i by a number of coils connected in parallel.

The short, uniformly shaped pipe bends b are connected to the straight long pipes a by the welds c. A lower pipe end d serves as a connection to a lower collecting chamber e and an upper pipe end f is used as a connection to an upper collecting chamber g. The pipe ends d, f are welded to the end pipes of the coil at the same height as the pipe bends. The turns of the snakes are advantageously laid in such a way that the offset pipe layer according to Fig. 2 results.

Fig. 3 shows the structure of a heat exchanger with a pre-built pulverized coal combustion chamber h, which can be selected for steam overheating but also for steam generation. The completely vertical heat exchanger i rests advantageously in or on profile-shaped support irons k, which also serve as guide rails for the individual snakes. The load taken up by this support iron k is transferred to the main girders L, which lie directly on the foundation masonry. The pipes of the heat exchanger are pulled down to below the boiler house corridor. Underneath the heat exchanger or its support structure there is a sufficiently high access room and above the pipe coils are held in place by a frame o, and the walls p, q are provided to protect the pipe bends b and the welds c against the flue gases. The path of the fire gases is determined by the guide walls r in the direction of the arrow. In order to facilitate the blowing off of the fly ash by the sootblower s, the walls p, r are arranged at an appropriate angle. The thermal insulation panels t, which are easily detachable, serve as a top and bottom finish.

A damaged pipe coil is repaired as follows: A strip of the walls p, q corresponding to the pipe coil in question is peeled off and the supporting iron h carrying the damaged pipe is removed. After the snake has been released from the collecting chambers e ', g located above, it is lowered onto trestles or the like, as indicated by dashed lines in Fig. 3. As a result, the lower welding point of the pipe to be replaced becomes accessible in the inspection room n, and the pipe can be cut off at this point. Then the snake will. `run necessary, e.g. B. lifted by means of a pulley system and cut the pipe, whereupon it can be pulled out upwards. Conversely, a new pipe is then inserted from above, first of all welded to the corresponding pipe bend at the top, whereupon the snake is lowered again and the new pipe is welded in below. Then the snake and the removed parts are put back in place.

Fig. 4 shows a cross section and Fig. 5 shows a longitudinal section of one Structure that is particularly suitable for a built-in traveling grate furnace 2c. Above the tube bundles i consisting of tube coils are opposite one another in the combustion chamber Arranged in a roof shape over the grate. The same is supported by the Carrying iron h and the girders v in the inspection rooms protruding into the fire chamber n. The design of the pipe coils otherwise corresponds to that of Fig. 3, and- the installation and removal of pipes takes place here in the same way as in the execution according to Fig. 3.

This structure results in a smooth, shaft-like combustion chamber ul without Continuous fire ceiling, whereby the length of the furnace (Fig. 5) can be chosen as desired can. The constriction that can be seen in Fig. 4 and formed by the inspection rooms n x of the combustion chamber ul causes a good swirling of the fire gases before the entrance to the heating surfaces of the pipe elements i.

The pipe elements i. can in the usual way more, for example elements y (Fig. 5) serving for water or air preheating are connected downstream.

Claims (3)

PATENT CLAIMS: r. Coiled tube boiler or superheater or the like with vertically arranged straight and smooth tubes of advantageously one and the same length and made of short tube bends of one and the same shape and size welded to them, characterized in that all tube bends (b) together with the welds (c) arranged outside the boundary walls of the heating gas flue and for supporting or suspending the pipe coils on individually removable support irons (k) located outside the heating gas flue or suspended from individually removable support irons in such a way that individual coils from the bundle after detachment from the collecting chambers (e or .e ', g) and, after removing a strip of the upper and lower boundary walls (p, q), can be lowered and raised for the purpose of making the welds accessible and for the purpose of cutting out and re-welding individual pipes. 2. coiled tube boiler according to claim z with pulverized coal or gas firing o. The like., Characterized in that the housing the coils (a, b) holding the back iron (k) in a bottom, optionally the ash cellar accessible space (s) and down are covered by a heat protection cladding, the inspection room possibly being under the boiler floor. 3. Coiled tube boiler according to claim i with grate firing, characterized in that the tube bundles (i) consisting of the tube coils (a, b) are arranged in two roof-shaped over the grate slightly inclined groups, the carriers (k, v) of the same in Shelters (n) that protrude into the fire chamber and the walls of which form a constriction (x) of the fire chamber (w). q .. System for heat exchange according to claim i to 3, characterized in that the elements consisting of the pipe coils (a, b) lie in groups on top of each other in separate fire gas chambers connected only by fire gas ducts, the carriers of the same in the protective spaces separating the fire gas chambers and the connecting channels of the fire gas chambers are used to pull out and insert the individual tubes.