Coal economizer and waste heat recovery boiler with the same

Abstract

The application discloses a coal economizer and a waste heat recovery boiler with the same, which comprises frame plates and a plurality of rows of pipes, the pipes are fixedly connected with the frame plates, further comprises a support for supporting the pipes, the support is arranged between two frame plates, and the pipes are arranged in connection with the support; the support is a heat exchange pipe. The coal economizer and the waste heat recovery boiler with the same have reasonable structure, the pipes between the frame plates can be supported, and the heat exchange efficiency of the coal economizer is improved.

Description

Technical Field

[0001] This invention relates to a support assembly, and more particularly to an economizer and a waste heat recovery boiler having the economizer. Background Technology

[0002] Waste heat recovery boilers are boilers that utilize the waste heat of high-temperature flue gas. Waste heat recovery boilers are generally vertically arranged and can be divided into multiple circulation loops. Each circulation loop consists of downcomers and risers. Feedwater enters the boiler drum through the economizer, and from the boiler drum, it is introduced into each lower header of the flue through the downcomers and then enters each heating surface. The steam generated after the water passes through the heating surface enters the header and then enters the boiler drum.

[0003] An economizer is an essential component of a waste heat recovery boiler. The existing economizer structure, as described in CN204693369U, includes a first header, a low-temperature economizer inlet, a second header, a low-temperature economizer outlet, a heating surface tube bank, and an anti-wear structure. The first header is connected to the low-temperature economizer inlet, which is connected to one end of the heating surface tube bank. The other end of the heating surface tube bank is connected to the second header, which is connected to the low-temperature economizer outlet. The anti-wear structure covers the heating surface tube bank. The heating surface tube bank includes multiple tube sections, multiple connecting structures, and multiple connecting elbows. The tube sections and connecting elbows are connected through the connecting structures, and the anti-wear structure covers the multiple connecting elbows.

[0004] The pipe bank is fixed by the first header and the second header. Due to the excessive length of the pipe bank, the pipe bank located between the first header and the second header is unsupported. Under the action of gravity, the impact of high-temperature flue gas, and the accumulation of dust, deformation will occur. Over time, this will easily damage the structure of the pipe bank itself and the connection structure between the pipe bank and the first header and the second header, affecting the service life of the economizer.

[0005] Therefore, it is necessary to improve the economizers in the existing technology and the waste heat recovery boilers with such economizers. Summary of the Invention

[0006] The purpose of this invention is to overcome the defects in the prior art and provide an economizer and a waste heat recovery boiler with the economizer, which can support the pipes between the frame plates and improve the heat exchange efficiency of the economizer.

[0007] To achieve the above-mentioned technical effects, the technical solution of the present invention is as follows: an economizer, comprising a frame plate and a plurality of pipes, wherein the pipes are fixedly connected to the frame plate, and further comprising a support member for supporting the pipes, wherein the support member is disposed between two of the frame plates, and the pipes are connected to the support member; the support member is a heat exchange tube.

[0008] A preferred technical solution is that the heat exchange tube is provided with an enhancement structure to improve its heat exchange efficiency.

[0009] A preferred technical solution is that the lifting structure includes a spiral section, and the heat exchange tube is provided with the spiral section.

[0010] A preferred technical solution is that two adjacent spiral units of the spiral segment are fixedly connected.

[0011] A preferred technical solution is that the heat exchange tube is provided with reinforcing ribs to improve the strength of the spiral segment, and the reinforcing ribs are fixedly provided between two adjacent spiral units of the spiral segment.

[0012] A preferred technical solution further includes heat exchange fins for connecting to the pipe, the heat exchange fins being fixedly disposed on the reinforcing ribs; the heat exchange fins are provided with limiting grooves that limit and cooperate with the pipe.

[0013] A preferred technical solution is that the outer wall of the heat exchange tube and the pipe is fixedly provided with a thickening plate.

[0014] A preferred technical solution further includes an inlet pipe communicating with the inlet of the drain pipe and an outlet pipe communicating with the outlet of the drain pipe; the inlet pipe is provided with an inlet branch pipe, and the inlet of the heat exchange tube is connected to the inlet branch pipe; the outlet pipe is provided with an outlet branch pipe, and the outlet of the heat exchange tube is connected to the outlet branch pipe.

[0015] A preferred technical solution is that the frame plate is fixedly provided with a fixing plate for fixing the water inlet branch pipe and the water outlet branch pipe.

[0016] A waste heat recovery boiler includes any of the economizers described above.

[0017] The advantages and beneficial effects of the present invention are as follows: The economizer and the waste heat recovery boiler having the economizer have a reasonable structure. By setting heat exchange tubes between the frame plates, the tubes not only provide support for the tubes, but also exchange heat with the tubes and with the high-temperature flue gas, thereby improving the heat exchange efficiency of the economizer. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the economizer of the present invention and a waste heat recovery boiler having the economizer in Embodiment 1;

[0019] Figure 2 yes Figure 1 Partial diagram of the explosion;

[0020] Figure 3 This is a schematic diagram of the structure of the heat exchange tube and the pipe arrangement in Example 1;

[0021] Figure 4 This is a schematic diagram of the heat exchange tube structure in Example 1;

[0022] Figure 5 This is a structural schematic diagram of Example 2;

[0023] Figure 6 This is a schematic diagram of the structure of the heat exchange tubes and the pipe arrangement in Example 2;

[0024] Figure 7 This is an exploded schematic diagram of the heat exchange tube and welded tube in Example 2;

[0025] Figure 8 This is a top view of the heat exchange tube in Example 2;

[0026] Figure 9 This is a schematic diagram of the welded pipe in Example 2;

[0027] Figure 10 This is a schematic diagram of the heat exchange tube structure in Example 3;

[0028] Figure 11 yes Figure 10 An explosion diagram;

[0029] Figure 12 This is an exploded schematic diagram of the heat exchange tube in Example 4;

[0030] In the diagram: 1. Frame plate; 11. Fixing plate; 2. Pipeline; 3. Heat exchanger tube; 31. Welded tube; 311. Protruding column; 312. Annular wall; 313. Perforation; 32. Connecting pipe; 4. Spiral section; 5. Reinforcing rib; 6. Heat exchanger fin; 61. Limiting groove; 7. Thickened plate; 8. Inlet pipe; 81. Inlet branch pipe; 9. Outlet pipe; 91. Outlet branch pipe. Detailed Implementation

[0031] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solutions of the present invention and should not be construed as limiting the scope of protection of the present invention.

[0032] In the description of this invention, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "horizontal," "vertical," "top," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations of the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0033] Example 1

[0034] like Figure 1-4 As shown, the economizer of Embodiment 1 includes a frame plate 1 and several pipes 2. The pipes 2 are fixedly connected to the frame plate 1. It also includes a support for supporting the pipes 2. The support is disposed between two of the frame plates 1. The pipes 2 are connected to the support. The support is a heat exchange tube 3.

[0035] Both ends of the pipe 2 are fixed to the frame plate 1 respectively. Since the pipe 2 is too long, if the pipe 2 between the two frame plates 1 is not supported, it is easy to deform under the action of gravity or flue gas impact, which will eventually lead to structural damage to the pipe. Through the above design, the heat exchange pipe 3 can not only support the pipe 2 between the two frame plates 1, but also further play a heat exchange role. The heat exchange pipe 3 exchanges heat with the pipe 2 and the external high-temperature flue gas at the same time, improving the heat absorption efficiency of the high-temperature flue gas.

[0036] Furthermore, the heat exchange tube 3 is an in-line water-cooled heat exchange tube, and a heat exchange fin 6 connected to the pipe 2 is fixedly installed on the in-line water-cooled heat exchange tube. The heat exchange fin 6 is provided with a limiting groove 61 that is matched with the pipe 2 for limiting.

[0037] With this design, the pipe 2 is confined within the heat exchange fin 6, achieving the purpose of fixed connection between the pipe 2 and the heat exchange tube 3. The heat exchange tube 3 provides support for the pipe 2 and achieves the purpose of heat exchange.

[0038] Specifically, the heat exchange tube 3 extends to be provided with a welded tube 31 for welding and fixing to the support beam of the smoke box, and the extension direction of the welded tube 31 is consistent with the direction from the bottom of the limiting groove 61 to the opening of the groove.

[0039] This design achieves the goal of hoisting and installing the economizer.

[0040] Specifically, it also includes an inlet pipe 8 connected to the inlet of the drain pipe 2 and an outlet pipe 9 connected to the outlet of the drain pipe 2; the inlet pipe 8 is provided with an inlet branch pipe 81, and the inlet of the heat exchange pipe 3 is connected to the inlet branch pipe 81; the outlet pipe 9 is provided with an outlet branch pipe 91, and the outlet of the heat exchange pipe 3 is connected to the outlet branch pipe 91.

[0041] This design enables water to flow through pipe 2 and heat exchange pipe 3, allowing cold water to enter and hot water to exit, thus absorbing heat from the flue gas.

[0042] Furthermore, the frame plate 1 is fixedly provided with a fixing plate 11 for fixing the water inlet branch pipe 81 and the water outlet branch pipe 91.

[0043] This design achieves the purpose of fixing the inlet branch pipe 81 and the outlet branch pipe 91.

[0044] Furthermore, the heat exchange fins 6 are configured in a one-to-one correspondence with the pipes 2.

[0045] With this design, all the pipes 2 can be effectively supported, and the heat exchange efficiency between the pipes 2 and the heat exchange tubes 3 is enhanced by increasing the contact area.

[0046] Furthermore, the heat exchange tubes 3 are arranged in several groups along the axial direction of the pipe array 2.

[0047] This design further enhances the support for pipe 2 and improves heat exchange efficiency.

[0048] A waste heat recovery boiler includes the aforementioned economizer.

[0049] The usage of Example 1 is as follows: High-temperature flue gas is introduced into the waste heat recovery boiler and passes through the economizer; cooling water enters the drain pipe 2 and heat exchange pipe 3 from the inlet pipe 8. The drain pipe 2 and heat exchange pipe 3 exchange heat with the high-temperature flue gas, and the cooling water absorbs heat and rises in temperature. The hot water is discharged from the outlet pipe 9 for use, thus realizing the purpose of utilizing the waste heat of high-temperature flue gas.

[0050] Example 2

[0051] like Figure 5-9 As shown, Embodiment 2 is based on Embodiment 1, except that the heat exchange tube 3 is provided with an enhancement structure to improve its heat exchange efficiency.

[0052] With this design, the heat exchange efficiency of the heat exchange tube 3 can be improved by increasing the surface area of ​​the heat exchange tube 3 and extending the flow time of the water in the heat exchange tube 3.

[0053] Specifically, the lifting structure includes a spiral section 4, and the heat exchange tube 3 is provided with the spiral section 4.

[0054] Through this design, the spiral section 4 greatly increases the surface area of ​​the heat exchange tube 3 (not only the outer surface can exchange heat with the high-temperature flue gas, but the inner surface can also exchange heat with the high-temperature flue gas), and the high-temperature flue gas has a sufficiently large contact area with the heat exchange tube 3, thereby enhancing the heat exchange efficiency of the heat exchange tube 3; the spiral section 4 also increases the flow distance of the flowing water, thereby increasing the flow time of the flowing water in the heat exchange tube 3, further enhancing the heat exchange efficiency of the heat exchange tube 3.

[0055] Furthermore, two adjacent spiral units of the spiral segment 4 are fixedly connected.

[0056] This design ensures the strength of the spiral segment 4. Two adjacent spiral units can be welded together and fixed, or filler can be welded into the gap between two adjacent spiral units.

[0057] Furthermore, the heat exchange tube 3 is provided with reinforcing ribs 5 to improve the strength of the spiral segment 4, and the reinforcing ribs 5 are fixedly provided between two adjacent spiral units of the spiral segment 4.

[0058] This design ensures the strength of the spiral section 4 and prevents it from deforming under the impact of flue gas and the accumulation of soot.

[0059] Specifically, it also includes heat exchange fins 6 for connecting to the pipe 2, the heat exchange fins 6 being fixedly mounted on the reinforcing rib 5.

[0060] With this design, the heat exchange fin 6 contacts the reinforcing rib 5, and the reinforcing rib 5 contacts the spiral segment 4. Compared with the heat exchange fin 6 being directly fixed to the surface of the spiral segment 4, this increases the contact area between the heat exchange fin 6 and the spiral segment 4, and improves the heat exchange effect of the heat exchange fin 6.

[0061] Specifically, the welded pipe 31 is provided with a protruding post 311 that is fixedly connected to the inner ring of the spiral segment 4, and the welded pipe 31 is provided with an annular wall 312 that is fixedly connected to the outer ring of the spiral segment 4. The end of the spiral segment 4 is clamped and fixed between the annular wall 312 and the protruding post 311.

[0062] With this design, the protrusion 311 of the welded pipe 31 and the annular wall 312 can be welded and fixed to the inner and outer rings of the spiral section 4, ensuring the firmness of the welded pipe 31 and the spiral section 4.

[0063] Specifically, the water inlets of two adjacent spiral segments 4 are connected by a connecting pipe 32, and the annular wall 312 is provided with a perforation 313 for the connecting pipe 32 to pass through.

[0064] This design achieves the goal of connecting two adjacent spiral sections 4, ensuring water flow through the spiral section 4 without affecting its hoisting.

[0065] Example 3

[0066] like Figure 10-11 As shown, Embodiment 3 is based on Embodiment 2, except that: the heat exchange tube 3 includes several identical spiral segments 4, the center lines of several spiral segments 4 are arranged to coincide, and the spiral units of two adjacent spiral segments 4 are arranged to fit together.

[0067] Regarding a single spiral segment 4, although the increased pitch reduces the flow time of the flowing water compared to Example 2, the flow time of the flowing water is still longer compared to the straight tube of Example 1. This design avoids the flowing water from having an excessively long flow time within the spiral segment 4, which would cause the temperature of the flowing water within the spiral segment 4 to become too high and reduce the heat exchange effect. The stacking of multiple spiral segments 4 increases the flow pipe, thereby increasing the flow rate of the flowing water and further improving the heat exchange effect.

[0068] Example 4

[0069] like Figure 12 As shown, Embodiment 3 is based on Embodiment 1, except that: the outer wall of the heat exchange tube 3 and the pipe 2 is fixedly provided with a thickening plate 7.

[0070] This design avoids the impact of flue gas on heat exchange tubes 3 and pipe 2, which would cause wear to the heat exchange tubes 3 and pipe 2. The thickened plate 7 can extend the service life of heat exchange tubes 3 and pipe 2.

[0071] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. An economizer, comprising a frame plate (1) and a plurality of pipes (2), wherein the pipes (2) are fixedly connected to the frame plate (1), characterized in that, It also includes a support member for supporting the pipe (2), the support member being disposed between the two frame plates (1), and the pipe (2) being connected to the support member; the support member is a heat exchange pipe (3). The heat exchange tube (3) is provided with a lifting structure to improve its heat exchange efficiency; The lifting structure includes a spiral section (4), and the heat exchange tube (3) is provided with the spiral section (4). The two adjacent spiral units of the spiral segment (4) are fixedly connected; It also includes an inlet pipe (8) connected to the inlet of the drain pipe (2) and an outlet pipe (9) connected to the outlet of the drain pipe (2); the inlet pipe (8) is provided with an inlet branch pipe (81), and the inlet of the heat exchange pipe (3) is connected to the inlet branch pipe (81); the outlet pipe (9) is provided with an outlet branch pipe (91), and the outlet of the heat exchange pipe (3) is connected to the outlet branch pipe (91); The heat exchange tube (3) is provided with reinforcing ribs (5) for improving the strength of the spiral segment (4), and the reinforcing ribs (5) are fixedly provided between two adjacent spiral units of the spiral segment (4); the heat exchange tube (3) includes several identical spiral segments (4), the center lines of several spiral segments (4) are arranged to coincide, and the spiral units of two adjacent spiral segments (4) are fitted together. It also includes heat exchange fins (6) for connecting to the pipe (2), the heat exchange fins (6) being fixedly disposed on the reinforcing rib (5); the heat exchange fins (6) are provided with limiting grooves (61) that limit and cooperate with the pipe (2). Thickening plates (7) are fixedly installed on the outer walls of the heat exchange tube (3) and the pipe (2); The frame plate (1) is fixedly provided with a fixing plate (11) for fixing the water inlet branch pipe (81) and the water outlet branch pipe (91).

2. A waste heat recovery boiler, characterized in that, Includes the economizer as described in claim 1.

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