Heat pipe for boiler

 

(57) Abstract:

Heat pipe consists of a cylindrical steel smooth wall of the outer tube (1) into which is inserted a core insert (2). Core insert is formed in two poliovaccine (3, 4) that are fixed to each other with their longitudinal edges by recesses (7) and the protrusions (8). Both half shells (3, 4) have on their internal surfaces of the longitudinal ribs (5) which are directed in such a way that each Probatica forms together with their edges open with one hand profile. The invention allows to increase the heat transfer and to facilitate the manufacture of the pipe. 6 C.p. f-crystals, 3 ill.

The present invention relates to a heat transfer pipe for a heating boiler, in particular for the boiler on gas fuel according to the restrictive part p. 1 claims.

Heat boilers, which operate mainly with heating boilers on gas, gaseous products of combustion are cooled to obtain a liquid condensate exhaust gases, in order to use the heat of condensation. A prerequisite of this is that the boiler operates at the temperature of the water in the boiler, which is the dew of the gaseous combustion products. While striving to be as brief as possible the area of the movement path of the gaseous products of combustion cooled using a water-cooled heat exchanger tubes of a heating boiler gaseous products of combustion at a high temperature at the inlet, which in modern gas burners may be located at about 850oC to the temperature existing at a level between dew point temperature and a lower temperature of boiler water existing on the way back to hot water heating boiler, for example, if 30oC. this known heat exchanger tubes, which consist of smooth cylindrical outer tube, made of steel, corrosion-resistant acid condensate exhaust gas, and the aluminum core insert having a cross section in the shape of a star and inserted in the outer pipe. In boilers of the most commonly used outer pipe must be made of steel to be welded to the bottom of the tube or to the plates of tubes that divide the water chamber of the boiler, heat exchanger surrounding the pipe, on the one hand from the combustion chamber and on the other side from the collection of the exhaust gases will heat the, who may be exposed to high temperature gas existing at the entrance, because aluminum has a higher coefficient of elongation than steel, so the profile box in the places of contact with the outer tube even under increasing pressure due to increasing temperature retains heat conducting contact with the outer tube. In the case of known connecting pipe heat transfer from the aluminum profile inserts made in the form of a star, to the outer steel tube is limited by the fact that the core insert is related to the external pipe only in places toothed surfaces of the radial elements of the core insert, the walls of which are relatively thin in its cross section, so as to keep enough free cross section in the outer tube for the passage of gaseous products of combustion. Next, for welding the outer steel pipe to the plates of the tubes was necessary that the ends of the outer tube, the ends of the aluminum profile insert, made in the shape of a star, were offset by a sufficient distance to prevent the destruction of radial elements aluminum profile inserts under the action of t is to create a heat exchange tube of the type specified above, which allows you to get a higher coefficient of heat transfer from the combustion gases of the boiler water and can easily be manufactured, and may be subjected to further processing during installation in the boiler.

This problem is solved by the present invention due to the design of heat-exchange pipes made as the connecting pipe consisting of an outer steel pipe and aluminum profile insert, and having distinctive features according to p. 1 claims.

Profile of the tubular insert the tubes in accordance with the present invention is on the one hand with a very large inner surface receiving the heat of the gaseous products of combustion and located mainly within both probetec ribs in the form of combs, and fits in comparison with the known profiles, having the shape of a star, its significantly greater outer surface to the inner edge of the water-cooled steel outer tube, resulting in a coefficient of heat transfer from the combustion gases of the boiler water increases significantly. As a result of experiments it was found that heat to the UP>C, if the length of the heat exchanger tube in accordance with the present invention until the outlet temperature is about 48oC, only slightly higher than the temperature of the circulating water. This unexpected result is obtained by hitherto unknown and applicable to heat the boiler heat exchanger tubes. A small length of heat transfer tube provides the ability to get another significant advantage of the fact that heat boiler at a vertical arrangement of the tubes can be made lower or horizontal arrangement of the heat exchange tubes can be made shorter and thus saves space. Despite the implementation of the profile insert with a large surface adjacent to the outer tube, and density of the heating surfaces inside the pipe, profile can insert having the shape of a tube to be manufactured simply and inexpensively by separating the two half shells and due to the fulfillment of each of the half shells with their edges in the form of an open on one side of the profile. For manufacturing using profile extrusion does not require any so-called mobile terminals in the matrix of the exhaust stamp, resulting in a tube with whom accordance with the present invention or during installation in the heating boiler is obtained in when the welding of the outer tube to his plate is not the destruction of the aluminum profile of the insert due to the very large heat-conducting contact surface and a large coefficient of thermal conductivity, if the end of the profile insert extends to coincide with the end of the outer tube, which is welded to the plate. Heat pipe must therefore be made with an offset relative to the ends of the outer tube ends of the profile insert, but may at the time of installation in the boiler to cut off a simple straight cut to the required length of the part being manufactured. The design of the contacting longitudinal edges of both probetec with labyrinthine seal, comprising photobrush grooves and ribbed protrusions, prevents the formation of gaps between the aluminum core insert and a steel outer tube, through which can penetrate the exhaust gas or condensate that may cause corrosion in the gaps. If the profile box at the simple design of the heat exchange tube in accordance with the present invention fits directly around the entire circumference of its tubular body to an external that has such an outer diameter, which basically corresponds to the inner diameter of the outer tube and is reduced only to such a small value, so that the tubular body can be freely introduced into the outer pipe, and that thereafter the outer tube in the compression process around the entire circumference of the outer tube, for example, in the process of rolling or process extracts were compressed in the radial direction and pressed against the aluminum profile is inserted. As a result of this contact the longitudinal edges of both probetec, as well as the tubular body and the outer tube are pressed tightly together so that there is no gap. It is also important for end edges of the end parts of the tubes serving plate for pipe, so also in this place could not penetrate the exhaust gas or condensate between the tubular body of the aluminum profile insert and the outer steel pipe.

In the dependent claims describe the predominant variants of the tubes in accordance with the present invention.

The drawings depict various variants of the structural design of the heat exchange tube in accordance with the present image is through the insert, directly adjacent to the outer steel pipe;

Fig. 2 shows a variant of embodiment according to the type of the variant shown in Fig. 1, with a simple additional element, designed to increase the inner surface;

Fig. 3 shows a variant of embodiment of the profile insert type shown in Fig. 1, adjacent with the staging profile to the outer pipe.

It is shown in Fig. 1 heat pipe consists of a smooth cylindrical outer tube 1, made of corrosion-resistant chrome steel, and from a profile insert 2 made of aluminum. Profile of the insert 2 is formed by a tubular body which is divided by an imaginary dividing plane passing through the longitudinal axis of the outer tube into two half shells 3, 4. On their inner surfaces are made both half shells 3, 4 ribs 5 which extend in the longitudinal direction of the outer tube and thus act in the lumen cross-section of the tubular body, each Probatica 3, 4 with their ribs 5 forms open with one hand profile, so that the half shells with their edges can simply and cheaply be manufactured using the tool the Ribs 5, as shown in the variant of embodiment of Fig. 1, are particularly advantageous manner in the form of scallops and perpendicular to the separation plane within both probetec 3, 4, and the ribs 5 both probetec 3, 4 are arranged in pairs relative to each other and extend to the dividing plane, or at least almost up to her. In particular, with this arrangement, the ribs 5 in the form of scallops can fin in the manufacture of probetec profile a press provided with a corrugated surface profile, passing in the longitudinal direction of the outer tube 1 or probetec 3, 4, which creates a substantial increase in heat transfer inner surface profile of the insert 2, a streamlined gaseous combustion products. Their contact on the separation plane of the longitudinal edges 6 are both half shells 3, 4 razoobrazny recesses 7 and ribbed projections 8, which are part of each other in the perpendicular direction relative to the dividing plane, and the longitudinal edges interact by type of labyrinth seal. Seal both of the joining surfaces between the longitudinal edges of probetec assetstatus body shaped insert 2 and the outer tube 1 and would cause corrosion in the gap. If both half shells, as shown in Fig. 1, made by one longitudinal edge with razoobrazny recess and the other longitudinal edge of the ribbed ledge, you can both half shells to cut off from one profile strip made of specialized press, in accordance with the desired length and each Probatica when rotated 180oaround the longitudinal axis is consistent with other paleobotany. In Fig. 1 shows a heat exchanger tube for greater clarity, not in final finished form. Composed of both probetec 3, 4 of the tubular body, which in the case of the example of embodiment according to Fig. 1 fits directly over its entire surface to the outer tube 1, made with an outside diameter which is only slightly less than the inner diameter of the outer tube to thereby tubular body or core insert 2 can easily be inserted in the outer pipe. After the pipe is exposed by rolling or drawing process compression along its entire circumference in the radial direction, in order to obtain important for heat transfer solid contact over the entire inner surface of the outer tube and across externally compressed without education gap thus Inbox each other recesses and projections of the longitudinal edges of both probetec and sealed absolutely tight against exhaust gas or condensate, it is impossible to identify when microdermabrasion cross-section of the finished heat exchanger tubes of any seam between the longitudinal edges of probetec. Joint compression without the formation clearance of the outer tube and core inserts by contact surfaces prevents further order from the front side mounted in the boiler heat exchanger tubes could penetrate exhaust gas or condensate between the outer tube and the core insert. Very high heat transfer coefficient of the heat transfer pipe between the core insert and the outer tube is extremely beneficial to reverse the heat flow during welding of the ends of the tubes with the tubes or plates of the tubes of the heating boiler. Experiments with welding showed that when combined end edge of the aluminum profile insert with the edge of the outer tube of chrome steel aluminum is not damaged and is not molten, while the outer tube made of chrome-plated steel must connect with the molten metal plate heat pipe of the boiler. Heat exchanger tube can therefore be cut to required for heating boiler length with a simple operation is 2">

In Fig. 2 shows a similar example of embodiment, in which the ends are arranged in the form of scallops ribs 5 keep such a distance from each other that between the ends can be inserted aluminum plate from a flat profile 9. The length of the ribs is of such dimensions that when combined probetec 3, 4 for receiving the tubular profiled insert the ends of the scallops with their end surfaces corresponding to the cross section of ribs, tightly and without education gap pressed to the flat profile 9 in order to obtain reliable heat-conducting contact between the flat profile and edges. In addition, the contacting longitudinal edges of both probetec can also be performed in such a way that they can capture the longitudinal edge of the flat profile and the finished tubular heat exchanger is firmly compressed between them, providing a good thermal conductivity. Using situated between the two pelobatidae flat profile can thermally conductive inner surface profile of the insert 2 to increase in a simple way without significant cost to the significant value of the order of 10% or more.

Fig. 3 shows an example of embodiment in which directly with the inner surface of the outer tube 1, but has an external diameter that is substantially smaller than the inner diameter of the outer tube 1. Formed in this way the annular space between the outer tube 1 and the core box 2 is located a cylindrical intermediate profile 10 of aluminum. This intermediate profile 10 comprises a tubular wall along its entire outer surface adjacent across the inner surface of the outer tube 1, providing conductivity, and from a large number of ribs 11 arranged in the radial direction on the inner surface of the tubular body, which extends to the outer surface profile of the insert 2 and in contact with the outer surface of the core insert, providing conductivity. The intermediate profile 10 is divided similarly as the inner core insert 2 dividing plane passing through the longitudinal axis of the outer tube into two halves intermediate profile, open on one side, which can be manufactured using a simple matrix exhaust stamp without rolling rod when using profile extrusion of aluminum. The intermediate profile 10 is accomplished similarly as shown in Fig. 1 core insert, sealed arianta design, it is shown in Fig. 1 can use a variant of embodiment shown in Fig. 3, to increase the total internal heat transfer surface of heat exchanger tubes, streamlined gaseous combustion products, at almost 100%. As a result, the length of the tubes can be made even shorter, to heat the boiler to cool the gaseous products of combustion at a temperature input, for example, 850oC, until the outlet temperature equal to the lower boundary of the formation of dew point of the gaseous combustion products, for example, 48oC.

1. Heat transfer pipe for a heating boiler, in particular for the boiler on gas, consisting of a smooth cylindrical steel pipe (1), which is flowed around by the exhaust gases of fuel combusted in the boiler and is washed out with water heating boiler, and inserted into the outer tube profile aluminum insert (2) to increase the inner surface of the outer tube has ribs (5), passing in its longitudinal direction, and contacts to ensure thermal conductivity with the outer tube, wherein the core insert (2) comprises a tubular body, that section is(3,4), both half shells on their adjoining longitudinal edges (6) is made with razoobrazny recesses (7) and ribbed protrusions (8) and thereby firmly into each other in the perpendicular direction relative to an imaginary dividing plane, and that the two half shells (3,4) on its inner side so done with ribs (5) extending in the longitudinal direction of the outer tube and protruding in the lumen cross-section of the tubular body, each Probatica with their edges forming an open one side of the profile.

2. Heat pipe under item 1, characterized in that the two half shells (3,4) are located inside the ribs (5) in the form of scallops, which are set perpendicular to the imaginary dividing plane and extends to an imaginary dividing plane being located in pairs opposite each other.

2. Heat pipe under item 1 or 2, characterized in that the two half shells (3,4) are provided, respectively, with the sealing groove (7) on one longitudinal edge (6) and on the other longitudinal edge (6) with sealing protrusion (8) corresponding to the shape of the groove (7).

4. Heat transfer t the stew, passing in the longitudinal direction of the outer tube or probetec (3,4).

5. Heat pipe under item 1, characterized in that it is composed of both probetec (3,4) core insert (2) has an external diameter generally corresponding to the inner diameter of the outer tube (1), and throughout its circumference is attached directly to the outer tube, and that the profile of the insert (2) is compressed with the outer tube (1) through a process of joint compression around the entire circumference of the outer tube in the radial direction.

6. Celebrina pipe under item 2, characterized in that between the ends made in the form of scallop edges (5) both probetec (3,4) is inserted aluminium flat profile (9) in the form of plates and the length of the ribs (5) shall be of such dimensions that when combined probetec (3,4) in the relevant box (2) the ends of the scallops pressed to the flat profile, providing conductivity.

7. Heat pipe under item 2, wherein the core insert (2), consisting of probetec (3,4) with the ribs (5) in the form of a comb, has an outer diameter that is substantially smaller than the inner diameter of the outer tube (1), and that in the annular chamber between the core insert (2) and outer tube (1) is located and the short ribs (11), extending in the radial direction from the tubular wall and extending to the profile of the insert (2), and similarly divided into two, open on one side of the half shells of the intermediate profile with an imaginary dividing plane passing through the longitudinal axis of the outer tube that are adjacent to each other along the longitudinal edges of its tubular wall and are sealed, the intermediate profile (10) is compressed under the action of the compression process in the radial direction of the outer tube (1) with the tube and with the inner core insert (2), providing conductivity.

 

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