Multi-fuel heat exchanger furnace

Abstract

A multi-fuel heat exchange furnace body comprises a lower header pipe, a plurality of pairs of special-shaped heat exchange pipes are connected to the lower header pipe in correspondence with left and right sides, the special-shaped heat exchange pipes are composed of a plurality of V-shaped pipes connected in sequence, the opening of the V-shaped pipe is inward, the lower edge of the lowermost V-shaped pipe is a vertical pipe, the lower end of the vertical pipe is connected to the lower header pipe, the upper edge of the uppermost V-shaped pipe is connected to the upper header pipe, a flow guide plate is fixedly arranged on the surface formed by the V-shaped edge except the uppermost V-shaped edge and the surface formed by the upper edge of the lowermost V-shaped pipe, the flow guide plates on the odd layers are located on the outer surface of the heat exchange pipes, the flow guide plates on the even layers are located on the inner surface of the heat exchange pipes, the outer ends of the two flow guide plates on the odd layers corresponding to the left and right sides are closed between the furnace body wall and the length space between the inner ends and the end of the V-shaped edge, the inner ends of the two flow guide plates on the even layers corresponding to the left and right sides are closed between the outer ends and the length space between the end of the V-shaped edge. The furnace body has small flow resistance.

Description

Technical Field

[0001] This utility model relates to heat exchange equipment, and in particular to a multi-fuel heat exchange furnace body, belonging to the field of heat exchange technology. Background Technology

[0002] The furnace body is one of the core components of a heat exchanger. It is the key area for heat exchange in the heat exchanger, and its design often determines the flow direction and flow resistance of high-temperature flue gas, which directly affects the heat exchange efficiency. Existing heat exchanger furnace bodies generally achieve sufficient heat exchange by setting up multiple flue gas return passes. Their structure generally adopts multiple heat exchange chambers (usually arranged vertically). Flue gas flows between multiple heat exchange chambers through horizontal reversal flow to achieve sufficient heat exchange. Although this method can achieve sufficient heat exchange, the resistance of flue gas under natural flow conditions is relatively large, which can easily form stagnation zones. Therefore, a large-power induced draft fan is generally required at the end of the flue gas path to provide a pressure difference for the flow of flue gas. Moreover, this type of furnace body is difficult to mass-produce through standardization and modularization. Summary of the Invention

[0003] The purpose of this invention is to provide a multi-fuel heat exchange furnace body.

[0004] To achieve the purpose of this utility model, the following technical solution is adopted: A multi-fuel heat exchange furnace body includes two lower manifolds, one on the left and one on the right, which are connected to a water inlet pipe. Multiple pairs of irregularly shaped heat exchange tubes are connected to the two lower manifolds on the left and right sides respectively. These pairs of irregularly shaped heat exchange tubes are distributed front to back, with gaps between adjacent pairs. Each pair of irregularly shaped heat exchange tubes consists of two separate tubes, one on the left and one on the right. Each irregularly shaped heat exchange tube is composed of multiple V-shaped tubes connected vertically. The openings of the V-shaped tubes face inwards. The lower edge of the lowest V-shaped tube is a vertical tube, the lower end of which is connected to the lower manifold. The upper edge of the highest V-shaped tube is connected to the upper manifold. The surface formed by the V-shaped edges other than the highest V-shaped edge... Guide plates are fixedly installed on the surfaces formed by the upper edges of the V-shaped tubes at the top and bottom. The guide plates cover the entire front-to-back length direction. The surface formed by the upper edge of the bottom V-shaped tube is defined as the first layer. On odd-numbered layers, the guide plates are located on the outer surface of the heat exchange tubes, and on even-numbered layers, the guide plates are located on the inner surface of the heat exchange tubes. On odd-numbered layers, the outer ends of the two guide plates facing each other on the left and right are closed with the furnace wall, and there is a length space between the inner ends and the ends of the V-shaped edges. On even-numbered layers, the inner ends of the two guide plates facing each other on the left and right are closed, and there is a length space between the outer ends and the ends of the V-shaped edges. The length space between the guide plates and the V-shaped edges forms a flue gas baffle channel. The furnace wall is located outside the vertical tubes, and the heat medium outlet pipe is connected to the upper manifold.

[0005] Furthermore, the upper edge of the lowest V-shaped tube is the same length as the V-shaped edge of the other V-shaped tubes.

[0006] Furthermore, the upper edge of the V-shaped tube at the bottom slopes upward from the outside in, and the surfaces of the odd-numbered layers are parallel to each other, as are the surfaces of the even-numbered layers.

[0007] Furthermore, a drain pipe is connected to the lower manifold.

[0008] Furthermore, the heterogeneous heat exchange tube consists of three V-shaped tubes connected vertically.

[0009] Furthermore, the aforementioned irregularly shaped heat exchange tube is either a finned tube or a smooth tube.

[0010] The positive and beneficial technical effects of this utility model are as follows: the flue gas in this furnace body flows from bottom to top, which conforms to the principle of hot gas rising, resulting in low flow resistance and improved heat exchange efficiency of positive pressure combustion. In heat exchange, a very small induced flow fan or no fan can be used. In addition, the irregular heat exchange tubes in this furnace body have the same shape, which is easy to standardize and mass-produce. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the front and rear directions of this utility model.

[0012] Figure 2 This is a perspective view of the present invention without the furnace wall. Detailed Implementation

[0013] To more fully explain the implementation of this utility model, implementation examples are provided. These implementation examples are merely illustrative of this utility model and do not limit its scope.

[0014] The present invention will be further explained in detail with reference to the accompanying drawings, in which the following references are made: 1: Water inlet pipe; 2: Lowermost V-shaped pipe; 3: Middle V-shaped pipe; 4: Uppermost V-shaped pipe; 5: Vertical pipe; 6: Guide plate on the first layer; 7: Guide plate on the second layer; 8: Upper manifold; 9: Uppermost V-shaped edge; 10: Liquid level gauge mounting pipe; 11: Furnace wall; 12: Lower manifold; 13: Heat medium outlet pipe; 14: Combustion chamber.

[0015] As shown in the attached diagram, a multi-fuel heat exchanger furnace body includes two lower manifolds 12, one on the left and one on the right. A drain pipe is connected to each lower manifold, and the two lower manifolds are connected to a water inlet pipe 1. Multiple pairs of irregularly shaped heat exchange tubes are connected to the left and right sides of the two lower manifolds. These irregularly shaped heat exchange tubes are either finned tubes or plain tubes. The multiple pairs of irregularly shaped heat exchange tubes are distributed front to back, with gaps between adjacent pairs. Each pair of irregularly shaped heat exchange tubes consists of two different types of tubes connected vertically. The combustion chamber is formed by the cross-section between the bottom pair of V-shaped tubes. In this embodiment, the heterogeneous heat exchange tube is composed of three V-shaped tubes connected vertically. The three V-shaped tubes are the bottom V-shaped tube 2, the middle V-shaped tube 3, and the top V-shaped tube 4. The openings of the V-shaped tubes face inward. In this invention, "inward" refers to the horizontal direction towards the upper manifold, and "outward" refers to the directions on both sides of the upper manifold. The lower edge of the bottom V-shaped tube is a vertical tube 5, and the lower end of the vertical tube 5 is connected to the lower manifold. On 12, the upper edge of the uppermost V-shaped tube is connected to the upper manifold 8. Figure 9 shows the uppermost V-shaped edge. Guide plates are fixedly installed on the surfaces formed by the V-shaped edges (excluding the uppermost V-shaped edge) and the surface formed by the upper edge of the lowermost V-shaped tube. No guide plates are installed on the surfaces formed by the vertical tubes. The guide plates cover the entire front-to-back length. The surface formed by the upper edge of the lowermost V-shaped tube is defined as the first layer below. On odd-numbered layers, the guide plates are located on the outer surface of the heat exchange tubes; on even-numbered layers, the guide plates are located on the inner surface of the heat exchange tubes. On odd-numbered layers, the outer ends of two opposing guide plates are closed to the furnace wall 11, while the inner ends have a length space between them and the ends of the V-shaped edges. On even-numbered layers, the inner ends of two opposing guide plates are closed, while the outer ends have a length space between them and the ends of the V-shaped edges. Figure 6 shows the guide plate on the first layer; Figure 7 shows the guide plate on the second layer. The length space between the guide plates and the V-shaped edges forms a flue gas baffle channel. Figure 1 The middle arrow indicates the flue gas flow path. The furnace wall 11 is located outside the vertical pipe, and the heat medium outlet pipe 13 is connected to the upper manifold. In this embodiment, the upper edge of the lowest V-shaped pipe is equal in length to the V-shaped edge of the other V-shaped pipes; the upper edge of the lowest V-shaped pipe slopes upward from the outside to the inside, and the surfaces of the odd-numbered layers are parallel to each other, as are the surfaces of the even-numbered layers. A level gauge mounting pipe 10 is installed on the furnace body. Figure 1 Section 14 is the cross-section of the combustion chamber, which is the cross-section formed by the pair of V-shaped tubes at the bottom.

[0016] The furnace body can be equipped with a reciprocating grate or a chain grate in the combustion chamber 14 for a combustion mode using biomass raw materials as fuel; and a fuel combustion mode using oil or gas can be achieved by adding an oil or gas burner in front of the combustion chamber.

[0017] When this furnace is in use, the flue gas generated in the combustion chamber flows downwards and upwards through the length of space not covered by the guide plate. The two adjacent lengths of space not covered by the guide plate are staggered in the left and right directions, which can deflect the flue gas and improve the heat exchange efficiency. During the deflection process, heat is exchanged with the heat medium in the heat exchange tube. After the heat medium enters the upper manifold, it flows out from the heat medium outlet pipe. It can be used as a steam generator furnace body or a hot water furnace furnace body. When in use, a waste heat exchanger can be connected after the space formed by the V-shaped tube at the top to recover waste heat.

[0018] After a detailed description of the embodiments of this utility model, those skilled in the art will clearly understand that various changes and modifications can be made without departing from the scope and spirit of the above-mentioned patent applications. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of this utility model shall fall within the scope of the technical solution of this utility model, and this utility model is not limited to the embodiments of the examples given in the specification.

Claims

1. A multi-fuel heat exchanger body, comprising two lower manifolds, left and right, the two lower manifolds being connected to a water inlet pipe, characterized in that: Multiple pairs of irregularly shaped heat exchange tubes are connected to the two lower manifolds on the left and right sides, respectively. These pairs are distributed front to back, with gaps between adjacent pairs. Each pair consists of two irregularly shaped heat exchange tubes, each composed of multiple V-shaped tubes connected vertically. The openings of the V-shaped tubes face inwards. The lower edge of the lowest V-shaped tube is a vertical tube, the lower end of which is connected to the lower manifold. The upper edge of the highest V-shaped tube is connected to the upper manifold. Guide tubes are fixedly installed on the surfaces formed by the V-shaped edges (excluding the uppermost V-shaped edge) and the surfaces formed by the upper edge of the lowest V-shaped tube. The guide plate covers the entire front-to-back length direction. The surface formed by the upper edge of the V-shaped tube at the bottom is defined as the first layer. On odd-numbered layers, the guide plates are located on the outer surface of the heat exchange tube, and on even-numbered layers, the guide plates are located on the inner surface of the heat exchange tube. On odd-numbered layers, the outer ends of the two opposite guide plates are closed with the furnace wall, and there is a length space between the inner ends and the V-shaped edge. On even-numbered layers, the inner ends of the two opposite guide plates are closed, and there is a length space between the outer ends and the V-shaped edge. The length space between the guide plate and the V-shaped edge forms a flue gas baffle channel. The furnace wall is located outside the vertical tube, and the heat medium outlet pipe is connected to the upper manifold.

2. The multi-fuel heat exchange furnace body according to claim 1, characterized in that: The upper edge of the bottom V-shaped tube is the same length as the V-shaped edge of the other V-shaped tubes.

3. The multi-fuel heat exchange furnace body according to claim 2, characterized in that: The upper edge of the V-shaped tube at the bottom slopes upward from the outside in, and the surfaces of the odd-numbered layers are parallel to each other, as are the surfaces of the even-numbered layers.

4. The multi-fuel heat exchange furnace body according to claim 1, characterized in that: A drain pipe is connected to the lower manifold.

5. A multi-fuel heat exchange furnace body according to claim 1, characterized in that: The heterogeneous heat exchange tube consists of three V-shaped tubes connected vertically.

6. A multi-fuel heat exchange furnace body according to claim 1, characterized in that: The irregularly shaped heat exchange tube is either a finned tube or a smooth tube.

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