Boiler flue gas waste heat recovery device

Abstract

The utility model relates to a boiler flue gas waste heat recovery device which comprises a boiler flue gas waste heat recoverer, the boiler flue gas waste heat recoverer comprises a first tank body, a second tank body, a spiral water supply pipeline and a multi-ring-shaped water supply pipeline, the second tank body is installed in the first tank body, and the multi-ring-shaped water supply pipeline is installed in the second tank body. A cavity is formed between the second tank body and the first tank body, and the spiral water supply pipeline is mounted in the cavity; due to the design of the annular water supply pipelines and the spiral water supply pipelines, the retention time of high-temperature flue gas waste heat is prolonged, heat can be conveniently spread through the annular pipes or the spiral pipes, the heat exchange heating surface is increased, the contact area of flue gas and a heat exchange medium is large, sufficient heat exchange is conducted inside and outside the annular pipes or the spiral pipes, and the high-temperature flue gas waste heat recycling rate is high.

Description

TECHNICAL FIELD

[0001] The utility model relates to flue gas waste heat recovery technical field, especially a kind of boiler flue gas waste heat recovery device. BACKGROUND

[0002] Boiler is a kind of energy conversion equipment, water enters boiler, and in steam-water system, the heat absorbed by boiler heating surface is transferred to water, so that water is heated to hot water or steam of certain temperature and pressure, then hot water or steam is led out and used.In the combustion equipment part, fuel combustion constantly releases heat, and the high-temperature flue gas generated by combustion transfers heat to the boiler heating surface by heat transfer, and finally is discharged by flue.The conventional boiler utilization process, there is the problem of high exhaust gas temperature, low boiler thermal efficiency, for this problem, high-temperature flue gas waste heat recovery technology has been proposed, which uses low-temperature water or air as heat exchange medium to cool flue gas and recycle the heat in flue gas, but the existing boiler waste heat recovery device uses single pipe to transport heat exchange medium, and the high-temperature flue gas waste heat stays for a short time, the contact area between high-temperature flue gas and heat exchange medium is small, which leads to low utilization rate of high-temperature flue gas waste heat. SUMMARY

[0003] The utility model discloses a kind of boiler flue gas waste heat recovery devices, can increase high-temperature flue gas waste heat stay time, increase the contact area between high-temperature flue gas and heat exchange medium, fully absorb the heat in high-temperature flue gas, to solve the problem proposed in above background technology.

[0004] To achieve the above object, the utility model provides the following technical scheme: including boiler flue gas waste heat recovery device, one side of the boiler flue gas waste heat recovery device is equipped with inlet, the inlet is communicated with the outlet of boiler by flue;The boiler flue gas waste heat recovery device includes first tank body, second tank body, spiral water supply pipeline and multiple annular water supply pipeline, the second tank body is installed in the first tank body, and one end of the second tank body is communicated with the first tank body, the multiple annular water supply pipeline is installed in the inside of the second tank body, and the water outlet end of the multiple annular water supply pipeline is communicated with the inlet pipe of boiler and extends out of the first tank body and the second tank body;Cavity is formed between the second tank body and the first tank body, the spiral water supply pipeline is installed in the cavity, and the water outlet end of the spiral water supply pipeline is communicated with the inlet pipe of boiler and extends out of the first tank body;The cavity is communicated with flue gas discharge pipe.

[0005] Further, a buffer plate is installed between the inlet and the multiple annular water supply pipeline in the second tank body, and a plurality of flue gas discharge holes are formed in the buffer plate.

[0006] Further, the diameter of the flue gas discharge hole in the middle of the buffer plate is smaller than the diameter of the flue gas discharge hole on the periphery of the buffer plate.

[0007] Further, a plurality of first fins are installed on the multi-ring water feeding pipe.

[0008] Further, a plurality of second fins are installed on the spiral water feeding pipe.

[0009] Further, a filter is arranged at the communication between the second tank and the first tank.

[0010] Further, a fixing cover is arranged at one end of the first tank, a fixing ring is connected to the fixing cover through a fixing column, the fixing ring can be clamped on one end of the second tank, and the filter is arranged on the fixing ring.

[0011] Further, a heat preservation layer is arranged outside the first tank.

[0012] Compared with the prior art, the present application has the following beneficial effects:

[0013] The boiler flue gas waste heat recovery device comprises a boiler flue gas waste heat recovery device, a multi-ring water feeding pipe, a spiral water feeding pipe, a first tank, a second tank, a filter, a fixing cover, a fixing ring and a heat preservation layer. BRIEF DESCRIPTION OF DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0015] Fig. 1 It is a schematic diagram of the overall structure of the present application.

[0016] Fig. 2 It is a sectional view of the present application.

[0017] The names of the components marked in the figure are as follows:

[0018] 1. boiler flue gas waste heat recovery device; 2. flue; 3. first tank body; 4. second tank body; 5. spiral water supply pipeline; 6. multi-ring water supply pipeline; 7. cavity; 8. exhaust pipe; 9. buffer plate; 10. exhaust hole; 11. filter; 12. fixed cover; 13. fixed ring; 14. fixed column; 15. heat preservation layer. DETAILED DESCRIPTION

[0019] In order to further illustrate the technical means and effects adopted by the present application to achieve the predetermined object of the present application, the specific embodiments, structures, features and effects according to the present application are described in detail as follows in combination with the drawings and preferred embodiments.

[0020] Embodiment: Please refer to Figs. 1-2A boiler flue gas waste heat recovery device, including boiler flue gas waste heat recovery device 1, one side of boiler flue gas waste heat recovery device 1 is equipped with flue gas inlet, flue gas inlet is communicated with the flue gas outlet of boiler through flue 2, high temperature flue gas in boiler flows into boiler flue gas waste heat recovery device 1 through flue gas outlet, flue 2 and flue gas inlet and carries out waste heat utilization.Boiler flue gas waste heat recovery device 1 includes first tank body 3, second tank body 4, spiral water supply pipeline 5 and multiple annular water supply pipeline 6, second tank body 4 is installed in first tank body 3, and one end of second tank body 4 is communicated with first tank body 3, multiple annular water supply pipeline 6 is installed in the inside of second tank body 4, the water outlet end of multiple annular water supply pipeline 6 is communicated with the water inlet pipe of boiler and is stretched out of first tank body 3 and second tank body 4, multiple annular water supply pipeline 6 is equipped with multiple first fins, first fin is prior art, so it is not shown in the drawing, can slow down the flow rate of high temperature flue gas, increase the residence time of high temperature flue gas waste heat, increase the heat exchange efficiency of high temperature flue gas and the water in multiple annular water supply pipeline 6. Between second tank body 4 and first tank body 3, form cavity 7, spiral water supply pipeline 5 is installed in cavity 7, the water outlet end of spiral water supply pipeline 5 is communicated with the water inlet pipe of boiler and is stretched out of first tank body 3, and spiral water supply pipeline 5 is equipped with multiple second fins. Second fin is prior art, so it is not shown in the drawing, can slow down the flow rate of high temperature flue gas, increase the residence time of high temperature flue gas waste heat, increase the heat exchange efficiency of high temperature flue gas and the water in spiral water supply pipeline 5. Cavity 7 is communicated with flue gas exhaust pipe 8, high temperature flue gas and normal temperature water in multiple annular water supply pipeline 6 carry out heat exchange, high temperature flue gas is preliminarily cooled after;High temperature flue gas flows into cavity 7 in first tank body 3 from second tank body 4, high temperature flue gas and normal temperature water in spiral water supply pipeline 5 carry out heat exchange, high temperature flue gas is further cooled, and is discharged again through flue gas exhaust pipe 8;Flue gas exhaust pipe 8 is also equipped with air pump, to facilitate the discharge of cooled flue gas. The outside of first tank body 3 is equipped with insulation layer 15, to ensure that the water in spiral water supply pipeline 5 after heat exchange is not cooled by the temperature of the outside.In operation, normal temperature water is respectively delivered to the multi-ring water supply pipe 6 and the spiral water supply pipe 5, and the high-temperature flue gas generated by the boiler is delivered into the second tank body 4 from the flue 2 through the smoke inlet, the high-temperature flue gas exchanges heat with the normal temperature water in the multi-ring water supply pipe 6, and the high-temperature flue gas is preliminarily cooled; then the high-temperature flue gas flows into the cavity 7 in the first tank body 3 from the second tank body 4, the high-temperature flue gas exchanges heat with the normal temperature water in the spiral water supply pipe 5, and the high-temperature flue gas is further cooled; the design of the multi-ring water supply pipe 6 and the spiral water supply pipe 5 increases the residence time of the high-temperature flue gas waste heat, facilitates the spread of heat through the annular pipe or the spiral pipe, increases the heat exchange heating surface, and increases the contact area between the flue gas and the heat exchange medium, so that sufficient heat exchange is performed inside and outside the annular pipe or the spiral pipe, and the high-temperature flue gas waste heat is recycled.

[0021] The communication position of the second tank body 4 and the first tank body 3 is provided with a filter 11, the filter 11 is installed on the second tank body 4, blocks the communication between the second tank body 4 and the first tank body 3, and avoids the high-temperature flue gas from flowing out from the gap between the second tank body 4 and the first tank body 3; the filter 11 can be an activated carbon layer, can adsorb pollutants in the flue gas, and avoids that the discharged flue gas contains impurities and harmful substances. One end of the first tank body 3 is provided with a fixed cover 12, the fixed cover 12 is connected with a fixed ring 13 through a fixed column 14, the fixed ring 13 can be clamped on one end of the second tank body 4, the filter 11 is installed on the fixed ring 13, the fixed ring 13 and the filter 11 are connected with the fixed cover 12 through the fixed column 14, and it is guaranteed that the high-temperature flue gas can flow into the cavity 7 after being filtered by the filter 11; meanwhile, when the boiler flue gas waste heat recycler 1 does not work, the fixed cover 12 and the filter 11 can be pulled out through the handle on the fixed cover 12, and the filter 11 is cleaned or replaced.

[0022] The working principle of the embodiment is as follows: when the boiler works, the boiler flue gas waste heat recycler 1 starts to work, normal temperature water is respectively delivered to the multi-ring water supply pipe 6 and the spiral water supply pipe 5, the high-temperature flue gas generated by the boiler is delivered into the second tank body 4 from the flue 2 through the smoke inlet, the high-temperature flue gas exchanges heat with the normal temperature water in the multi-ring water supply pipe 6, and the high-temperature flue gas is preliminarily cooled; then the high-temperature flue gas flows into the filter 11 from the second tank body 4 for filtration, the filtered high-temperature flue gas flows into the cavity 7 in the first tank body 3, the high-temperature flue gas exchanges heat with the normal temperature water in the spiral water supply pipe 5, the high-temperature flue gas is further cooled, and is discharged through the smoke exhaust pipe 8, and the work is repeated.

[0023] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there can be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there can be an intervening element. The terms "upper", "lower", "left", "right", "front", "rear", and the like as used herein are for the purpose of illustration only.

[0024] The above merely describes the preferred embodiments of the present application, and is not intended to limit the present application in any form. Although the present application has been disclosed with the preferred embodiments as above, it is not intended to limit the present application. Any person skilled in the art can make some changes or modifications to the above disclosed technical content to obtain equivalent embodiments with equivalent changes, without departing from the technical solution of the present application. Any modification, change, equivalent change and modification of the above embodiments made according to the technical essence of the present application, without departing from the technical solution of the present application, still belongs to the scope of the technical solution of the present application.

Claims

1. A boiler flue gas waste heat recovery device, characterized by: The utility model provides a boiler flue gas waste heat recovery device, which comprises a boiler flue gas waste heat recovery device (1), one side of the boiler flue gas waste heat recovery device (1) is provided with a flue gas inlet, the flue gas inlet is communicated with the flue gas outlet of the boiler through a flue (2), the boiler flue gas waste heat recovery device (1) comprises a first tank body (3), a second tank body (4), a spiral water supply pipeline (5) and a multi-ring water supply pipeline (6), the second tank body (4) is installed in the first tank body (3), one end of the second tank body (4) is communicated with the first tank body (3), the multi-ring water supply pipeline (6) is installed in the second tank body (4), and the water outlet end of the multi-ring water supply pipeline (6) is communicated with the water inlet pipe of the boiler and protrudes from the first tank body (3) and the second tank body (4), a cavity (7) is formed between the second tank body (4) and the first tank body (3), the spiral water supply pipeline (5) is installed in the cavity (7), and the water outlet end of the spiral water supply pipeline (5) is communicated with the water inlet pipe of the boiler and protrudes from the first tank body (3); the cavity (7) is communicated with a flue gas exhaust pipe (8).

2. The boiler flue gas waste heat recovery device according to claim 1, characterized in that: A buffer plate (9) is installed between the flue gas inlet and the multi-ring water supply pipeline (6) in the second tank body (4), a plurality of flue gas exhaust holes (10) are formed in the buffer plate (9).

3. The boiler flue gas waste heat recovery device according to claim 2, characterized by: The diameter of the flue gas exhaust hole (10) in the middle of the buffer plate (9) is smaller than the diameter of the flue gas exhaust hole (10) on the circumferential side of the buffer plate (9).

4. The boiler flue gas waste heat recovery device according to claim 1, characterized by: A plurality of first fins are installed on the multi-ring water supply pipeline (6).

5. The boiler flue gas waste heat recovery device according to claim 1, characterized in that: A plurality of second fins are installed on the spiral water supply pipeline (5).

6. The boiler flue gas waste heat recovery device according to claim 1, characterized by: A filter (11) is arranged at the communication position of the second tank body (4) and the first tank body (3).

7. The boiler flue gas heat recovery device according to claim 6, characterized in that: One end of the first tank body (3) is provided with a fixed cover (12), the fixed cover (12) is connected with a fixed ring (13) through a fixed column (14), the fixed ring (13) can be clamped on one end of the second tank body (4), and the filter (11) is installed on the fixed ring (13).

8. The boiler flue gas waste heat recovery device according to claim 1, characterized by: An insulating layer (15) is arranged on the outside of the first tank body (3).

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