The heater

 

(57) Abstract:

The invention is intended for use in the field of heat, and it can be used in air heating systems, air conditioning, ventilation. The invention contains the path of the coolant channels of the duct cross-direction Teploobmennik environments and surface heat transfer, and the path of the coolant is made in the form of whole boxes formed by the cross section of the flat walls, two of which, opposite are performed symmetrically relative to each other through a slit with a fillet around the perimeter, through which space over the exterior surfaces of the walls communicated to each other via a closed perimeter elements forming a heat exchange surface, is made of sheet metal, mounted with a tight fit their extremities in these rounded slit, moreover, the ends of the closed ends of the elements around the perimeter of the junction in the slits made with closed outside edges, protruding above the outer surface of the walls, a closed element in the region of one of its rounded surfaces are made with nachlese wall. The invention allows to significantly improve the efficiency of operation of the heat exchanger. 2 Il.

The invention relates to the field of power engineering, and specifically to the boiler building for heating the air leaving gases of boilers, and can be used in air heating systems, ventilation, air conditioning, furnace aggregates industry, transport and stationary objects.

Known heater comprising a heat exchange surface in the form of straight pipes, reported its ends with tubular boards and installed in the flue of the boiler, while the gases are moving inside the pipe, and the outside air in the cross-direction (see the book. The development of marine steam generators: a Textbook authors Dementiev K. S. and other HP: Shipbuilding, 1986, S. 178-184). The disadvantages of this heater are:

the relatively large mass through the use of pipes with wall thickness more than 1 mm;

- low coefficient of compactness, f50 square m/cubic m;

- the complexity of the replacement tubular heat exchange surface during repairs;

- the difficulty of clearing of sediments with gas and especially with the air of the parties.

Una) during operation.

Known heater comprising a gas duct and the duct cross-direction Teploobmennik environments and the heat exchange surface in the form of profiled sheets or plates welded around the perimeter and collected in bags, with the formation of specialized channels for the movement of gas and air (see ibid., pp. 185-189). This heater, as the closest, selected as a prototype of the proposed solution. The disadvantages of the prototype are:

the relatively large mass of the heater through the use of heat transfer surface with a material thickness of about 1 mm;

- the complexity and the relatively greater complexity of manufacturing due to the great length of welds;

the difficulty or impossibility of replacing the worn part of the surface heat transfer and the need for full and time-consuming replacement in cross-corrosion damage;

- low efficiency of use of corrosion-resistant coating of heat transfer surface, damaged in the area of the welds during fabrication;

the difficulty of cleaning the profile of the channels in areas of narrowing or t-shaped joints, often accompanied by a decrease in the efficiency of utilization.

The challenge which seeks the invention is to remedy these disadvantages: reduction in weight and complexity of the manufacturing process, the possibility of a simplified replace partially or completely the surface of heat transfer, including without factory repair, elimination of welds and the ability to effectively use anti-corrosion coatings, nepodrazhaemyj in the manufacture and replacement of heat transfer surface, simplifying cleanup operations, which increases the efficiency of operation of the heater.

This object is achieved in that in the known heater comprising a path of the coolant and the channels of the duct cross-direction Teploobmennik environments and surface heat transfer, in contrast, in the inventive path of the coolant is made in the form of whole boxes formed by the cross section of the flat walls, two of which, oppositely located, have performed symmetrically relative to each other through a slit with a fillet around the perimeter, through which space over the exterior surfaces of the walls communicated with each other through closed on perimete fit their extremities in these rounded slit, moreover, the ends of the closed ends of the elements around the perimeter of the junction in the slits made with a curved outside edges, protruding above the outer surface of the walls, a closed element in the region of one of the rounding its surface is made with overlapping walls formed at the junction of the fit of this rounded surface of the element to the surface of its side wall, and themselves through the cracks of the walls placed with a uniform pitch on their surface.

The claimed combination of restrictive and distinctive characteristics provides a simplification of manufacture and repair, and persistence povrezhdaemosti corrosion-resistant coating on the surface of the heat exchange in the manufacture, maintenance and cleaning, increases reliability, and improves operating efficiency.

Box-like shape of the heat path from the heat exchange surface in the form of a flat walls closed around the perimeter of elements provides, firstly, the ability of the composition of the heater from a number of series and(or) installed in parallel and joined to each other end surfaces of the flat wall sections to increase the surface of heat exchange with the cost accounting Teploobmennik coolant and air access for inspection, clean or repair if the blockage or damage to the heat exchange surface.

Performing heat exchange surface in the form of flat surfaces, closed on the perimeter of the slit overlap, allows, firstly, as preparations to use thin-walled (0.5 mm) material with corrosion-resistant coating and eliminate damage to the coating at curves in the region of the fillet slot flat wall, and secondly, it is easy to remove the damaged surface heat transfer through a lamina of material from the surface cracks.

Supply wall heat tract symmetric end-to-end slits allows, firstly, to easily make the surface of the heat transfer inside the heat tract on either side of the slot walls with the formation of the same amount of protrusion on the outer surface of the walls, secondly, to make the injection of heat transfer surface on both sides relative to the surface cracks using the opposite set of wedges with a maximum size corresponding to the size and shape of the slit, i.e., effectively, in the third place, it is easy to perform sealing of the duct due to the pre-connection lapped surface-side heat transfer heat is a need for corrosion-resistant coating on the heat exchange surface, improve the reliability and efficiency of operation of the heater.

The claimed technical solution is illustrated by the following illustrations. In Fig. 1 presents a diagram of the heater, and Fig.2 - the same, in axonometric view.

The heater has the following device. Two pairs of flat walls 1 and 2 are welded to each other along the adjacent end surfaces form a box-like shape tract fluid, for example gas. A flat wall 2 provided with a through slit 3, rounded edges and are made with a uniform pitch on a flat surface. The heat exchange surface contains 4 sheets, folded in the form of a slit in a closed heat exchange elements 5 with the formation of the channels 6. Each channel 6 of the element 5 is formed by connecting lap 7 sheets 4. Tip element 5 is pressed into the slits 3 flared 8 on their outer contour on the outer surface of the flat walls 2.

The heater used in the following way. A supply of air heated in the air heater, perform one of the sides of the walls 2 (the direction of flow of cold air shown in the diagram on the right side of the arrows) into the channels 6. Passing through kanelopoulos side wall 2. Supply of hot gases carried out as shown in the diagram on the underside of the box bounded by the walls 1 and 2. Washing the external cold surface of the sheet 4, the gases are cooled and discharged from the upper part of the boxes, as shown by the arrows.

Proof of air moving in the channels 6 in the cavity tract fluid connection is provided by lap 7 sheets 4 element 5. Due to excessive air pressure in the channel 6 against the pressure of the gas in the path of the coolant is provided by the seal 7. This also contributes to the reduction of rigidity of the material due to the small thickness of the sheets 4, which does not exceed 0.5 mm Using the flange 8 on the outer surface of the wall 2, is obtained by using compression is the opposite set of wedges (not shown), prevents the bypass of air between channels 6 and the surface of the slits 3 in the cavity of the path of the coolant.

The lack of hard links (welding, brazing, etc.,) between the United overlapping sheets 4 and between the elements 5 and the surface of the slits 3 in the wall 2 provides the possibility of thermal expansion of the heat transfer elements 5 without distorting their shape and with the exception of thermal stresses in the elements Coca air heater from deposits on the outer and inner surfaces of the channels 6 may be carried out by blasting the surface with jets of steam during operation from stationary Barabanenkov, mounted on carrier Cabinet construction with flanged inlet-exhaust gas and air (not shown), and by mechanical cleaning in misexplanation period when removing the heater from the specified bearing structure (not shown) in the transverse direction relative to the flow of air and gases with the implementation of the inspection and detection of heat transfer surface. Repair heat exchange surface when replacing a damaged heat exchanger elements 5 is carried out by lamina thin sheets 4 (not shown) and their removal and subsequent replacement. This ensures the safety of anti-corrosion coating on the surface of the sheet material used for the heater.

Thus, the decreasing weight of the air heater through the use of thin-walled heat exchange surface, reducing the complexity of the manufacturing process by eliminating the welding joints of structural elements with surface heat transfer, ease of replacement or repair of heat transfer surface that does not require complicated equipment or high qualification of the work force, high efficiency corrosion-resistant coating of heat transfer surface, not powerhead operation while maintaining high thermal efficiency of the heater.

The heater containing the path of the coolant and the channels of the duct cross-direction Teploobmennik environments and surface heat transfer, characterized in that the path of the coolant is made in the form of whole boxes formed by the cross section of the flat walls, two of which, opposite are performed symmetrically relative to each other through a slit with a fillet around the perimeter, through which space over the exterior surfaces of the walls communicated to each other via a closed perimeter elements forming a heat exchange surface, is made of sheet metal, mounted with a tight fit their extremities in these rounded slit, moreover, the ends of the closed ends of the elements around the perimeter of the junction in the slits made with a curved outside edges, protruding above the outer surface of the walls, a closed element in the region of one of the rounding its surface is made with overlapping walls formed at the junction of the fit of this rounded surface of the element to the surface of its side wall, and themselves through the cracks of the walls placed with a uniform pitch on their surface.

 

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