Fire tube energy saver

Abstract

The invention provides a fire tube economizer which comprises a barrel and a plurality of heat exchange tubes located in the barrel, an upper tube plate is arranged on the upper portion of the barrel, a lower tube plate and a water inlet tube are arranged on the lower portion of the barrel, the upper tube plate and the lower tube plate are each provided with a plurality of through holes allowing the heat exchange tubes to penetrate through, and the upper ends and the lower ends of the heat exchange tubes are fixedly welded to the upper tube plate and the lower tube plate respectively. A water storage cavity is formed between the barrel and the heat exchange tubes, an annular collecting box is arranged above the upper tube plate, the upper tube plate and the annular collecting box are connected through a water diversion pipe, and a water outlet pipe is arranged on the annular collecting box. As the position of the annular collecting box is higher than the upper tube plate, a cavity between the inner wall of the barrel and the upper and lower tube plates can be filled with water, so that the sections, close to the upper tube plate, of the upper tube plate and the heat exchange tube can be effectively cooled, and the service life is prolonged.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of boiler, in particular to a fire tube economizer. BACKGROUND

[0002] The fire tube economizer is a device for recovering waste heat in the flue gas discharged by industrial equipment (such as boiler, kiln), which converts the waste heat into available energy through heat exchange, so as to achieve energy saving and consumption reduction. The fire tube economizer in the prior art comprises a cylinder and a plurality of heat exchange tubes located in the cylinder, an upper tube plate and a water outlet pipe are arranged on the upper part of the cylinder, a lower tube plate and a water inlet pipe are arranged on the lower part of the cylinder, the upper tube plate and the lower tube plate are both provided with a plurality of through holes for the heat exchange tubes to pass through, the flue gas flows in the heat exchange tubes from top to bottom, and the water flows in the cavity between the outer wall of the heat exchange tube and the inner wall of the cylinder from bottom to top. Since the steam generated by the heated water will accumulate on the upper part of the cavity between the outer wall of the heat exchange tube and the inner wall of the cylinder, the upper tube plate and the part of the heat exchange tube close to the upper tube plate will not be effectively cooled for a long time and are prone to damage. SUMMARY

[0003] The technical problem to be solved by the present application is to provide a fire tube economizer which is not easy to be damaged.

[0004] In order to solve the above technical problem, the present application adopts the following technical scheme: a fire tube economizer, comprising a cylinder and a plurality of heat exchange tubes located in the cylinder, an upper tube plate is arranged on the upper part of the cylinder, and a lower tube plate and a water inlet pipe are arranged on the lower part of the cylinder; the upper tube plate and the lower tube plate are both provided with a plurality of through holes for the heat exchange tubes to pass through, the upper ends and the lower ends of the plurality of heat exchange tubes are respectively welded and fixed with the upper tube plate and the lower tube plate, so as to form a water storage cavity between the cylinder and the heat exchange tubes; an annular header is arranged above the upper tube plate, the upper tube plate and the annular header are connected through a water guide pipe, and a water outlet pipe is arranged on the annular header.

[0005] In the above technical scheme, the annular header is arranged above the upper tube plate, the upper tube plate and the annular header are connected through the water guide pipe, and the water outlet pipe is arranged on the annular header. The position of the annular header is higher than that of the upper tube plate, so that the water can fill the lower water storage cavity, thereby ensuring that the part of the upper tube plate and the heat exchange tube close to the upper tube plate is effectively cooled, and the service life is prolonged.

[0006] Preferably, the number of water guide pipes is multiple, so as to enhance the communication between the water storage cavity and the annular header.

[0007] Further, the side of the annular header and the water guide pipe facing the fire is protected by a refractory material to avoid damage caused by high temperature.

[0008] Further, the outer periphery of the entire economizer is covered with thermal insulation cotton.

[0009] In an embodiment, the lower tube plate is provided with a blowdown pipe.

[0010] In one embodiment, the energy saver is provided with flue connection flanges at both the upper and lower ends. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the overall structure of the fire tube energy saver in an embodiment of the present invention;

[0012] The attached figures are labeled as follows:

[0013] 1. Shell; 2. Heat exchange tubes; 3. Upper tube sheet; 4. Lower tube sheet; 5. Inlet pipe; 6. Drain pipe; 7. Water inlet pipe; 8. Annular header; 9. Outlet pipe; 10. Refractory material; 11. Insulation cotton; 12. Flue connection flange. Detailed Implementation

[0014] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to embodiments and accompanying drawings. The content mentioned in the embodiments is not intended to limit the present invention.

[0015] It should be noted in advance that, in this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0016] like Figure 1 The fire-tube energy-saving device shown includes a cylinder 1 and multiple heat exchange tubes 2 located inside the cylinder 1. An upper tube sheet 3 is provided at the upper part of the cylinder 1, and a lower tube sheet 4 and a water inlet pipe 5 are provided at the lower part of the cylinder 1. A drain pipe 6 is provided on the lower tube sheet 4. Both the upper tube sheet 3 and the lower tube sheet 4 are provided with multiple through holes for the heat exchange tubes 2 to pass through. The upper and lower ends of the multiple heat exchange tubes 2 are welded and fixed to the upper tube sheet 3 and the lower tube sheet 4 respectively, so that a water storage cavity is formed between the cylinder 1 and the heat exchange tubes 2. An annular header 8 is provided above the upper tube sheet 3. The upper tube sheet 3 and the annular header 8 are connected by multiple water inlet pipes 7. A water outlet pipe 9 is provided on the annular header 8. Flue gas flows from top to bottom inside the heat exchange tubes 2, and water flows from bottom to top in the water storage cavity. The fire-facing side of the annular header 8 and the water inlet pipes 7 are protected with refractory material 10. The outer circumference of the entire energy-saving device is covered with thermal insulation cotton 11. Flue connection flanges 12 are provided at both the upper and lower ends of the energy-saving device.

[0017] In the above technical solution, an annular header 8 is provided above the upper tube sheet 3, and the upper tube sheet 3 and the annular header 8 are connected by a water inlet pipe 7. The annular header 8 is provided with a water outlet pipe 9. The position of the annular header 8 is higher than that of the upper tube sheet 3, so that water can fill the water storage cavity below, thereby ensuring that the upper tube sheet 3 and the section of the heat exchange tube 2 close to the upper tube sheet 3 are effectively cooled and the service life is extended.

[0018] The above embodiments are preferred implementations of the present invention. In addition, the present invention can be implemented in other ways. Any obvious substitutions without departing from the concept of the present technical solution are within the protection scope of the present invention.

[0019] To facilitate understanding by those skilled in the art of the improvements of this invention over the prior art, some of the accompanying drawings and descriptions have been simplified, and for clarity, some other elements have been omitted from this application. Those skilled in the art should realize that these omitted elements may also constitute the content of this invention.

Claims

1. A fire-tube energy-saving device, characterized in that: It includes a cylinder (1) and multiple heat exchange tubes (2) located inside the cylinder (1). The upper part of the cylinder (1) is provided with an upper tube sheet (3), and the lower part of the cylinder (1) is provided with a lower tube sheet (4) and a water inlet pipe (5). Both the upper tube sheet (3) and the lower tube sheet (4) are provided with multiple through holes for the heat exchange tubes (2) to pass through. The upper and lower ends of the multiple heat exchange tubes (2) are welded and fixed to the upper tube sheet (3) and the lower tube sheet (4) respectively, so that a water storage cavity is formed between the cylinder (1) and the heat exchange tubes (2). An annular header (8) is provided above the upper tube sheet (3). The upper tube sheet (3) and the annular header (8) are connected by a water inlet pipe (7). The annular header (8) is provided with a water outlet pipe (9).

2. The fire-tube energy-saving device according to claim 1, characterized in that: The number of water pipes (7) is multiple.

3. The fire-tube energy-saving device according to claim 1 or 2, characterized in that: The fire-facing side of the annular header (8) and the water pipe (7) is protected with fire-resistant material (10).

4. The fire-tube energy-saving device according to claim 1 or 2, characterized in that: The entire outer periphery of the energy-saving device is covered with thermal insulation cotton (11).

5. The fire-tube energy-saving device according to claim 1 or 2, characterized in that: The lower tube sheet (4) is equipped with a sewage pipe (6).

6. The fire-tube energy-saving device according to claim 1 or 2, characterized in that: Both the upper and lower ends of the energy-saving device are equipped with flue connection flanges (12).

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