CN220119408U

CN220119408U - Boiler flue gas waste heat recovery heat pipe heat exchanger

Info

Publication number: CN220119408U
Application number: CN202321506298.4U
Authority: CN
Inventors: 张晓清; 晁海亮; 李攀; 张�浩; 王颖; 张鹏
Original assignee: Xi'an Xingang Distributed Energy Co ltd
Current assignee: Xi'an Xingang Distributed Energy Co ltd
Priority date: 2023-06-13
Filing date: 2023-06-13
Publication date: 2023-12-01
Anticipated expiration: 2033-06-13

Abstract

The utility model belongs to the technical field of boiler waste heat recovery, and relates to a boiler flue gas waste heat recovery heat pipe heat exchanger, which comprises a boiler and a recovery heat pipe heat exchanger.

Description

Boiler flue gas waste heat recovery heat pipe heat exchanger

Technical Field

The utility model belongs to the technical field of boiler waste heat recovery, and relates to a boiler flue gas waste heat recovery heat pipe heat exchanger.

Background

Among the various heat losses of the boiler, the smoke emission losses account for a significant portion. The direct discharge of high-temperature flue gas is a huge energy waste and can cause environmental pollution. If the heat of the exhausted smoke can be effectively recovered, the heat efficiency of the boiler is improved, and a large amount of fuel consumption can be saved. Therefore, the efficient recovery of the waste heat of the flue gas of the boiler is realized by adopting an effective method, and the focus of attention is always focused.

However, the existing small-sized boiler or household boiler cannot be provided with the whole set of waste heat recovery system due to insufficient space and excessive cost, so that energy sources are wasted and the environment is polluted when high-temperature flue gas is discharged. Accordingly, there is a need for a compact boiler flue gas waste heat recovery device suitable for use in a small boiler to solve the above problems.

Disclosure of Invention

The technical scheme adopted for solving the technical problems is as follows: a boiler flue gas waste heat recovery heat pipe heat exchanger comprising: the boiler is provided with a boiler water inlet, a boiler water outlet, a boiler air inlet and a boiler flue gas port, the recovery heat pipe heat exchanger is cuboid, a cuboid primary heat exchanger is arranged at the upper part of the recovery heat pipe heat exchanger, and a cuboid secondary heat exchanger is arranged at the lower part of the recovery heat pipe heat exchanger;

a plurality of long straight square tubes with square cross sections are clustered side by side in the primary heat exchanger, the square tubes are divided into a smoke square tube and a cooling water square tube, the smoke square tube is used as a smoke channel, the cooling water square tube is used as a water flow channel, two ends of the square tube cluster are respectively provided with a cluster end, two one-way multiple tube interfaces are arranged in the cluster end, all the two ends of the smoke square tube are respectively communicated to a smoke inlet and a smoke outlet of the smoke square tube by the cluster end, all the two ends of the cooling water square tube are respectively communicated to a cooling water square tube water inlet and a cooling water square tube water outlet by the cluster end, the smoke square tube and the cooling water square tube are alternately and closely arranged at intervals, the smoke square tube and the cooling water square tube are made of heat conducting materials, and the smoke flow direction in the smoke square tube is opposite to the water flow direction in the cooling water square tube; in the primary heat exchanger, heat in the flue gas is recovered once in a mode that water flow is adjacent to the flue gas and objects flow, and the flue gas square pipes and the cooling water square pipes are arranged in parallel in a clustered mode and are staggered and abutted at intervals, so that heat exchange is more sufficient, and in actual use, the heat exchange efficiency can be enhanced again in a mode that the flue gas square pipes and the cooling water square pipes share adjacent pipe walls;

a plurality of long hexagonal pipes with regular hexagonal cross sections are clustered side by side in the secondary heat exchanger, the hexagonal pipes are divided into a flue gas hexagonal pipe and an air hexagonal pipe, the flue gas hexagonal pipe is used as a flue gas channel, the air hexagonal pipe is used as an air channel, the clustered ends of the hexagonal pipes are respectively provided with clustered ends, the clustered ends respectively communicate all the two ends of the flue gas hexagonal pipe with a flue gas inlet and a flue gas outlet of the flue gas hexagonal pipe, the clustered ends respectively communicate all the two ends of the air hexagonal pipe with a flue gas inlet and a flue gas outlet of the air hexagonal pipe, six side surfaces of the flue gas hexagonal pipe are all made of heat conducting materials, and the flue gas flow direction in the flue gas hexagonal pipe is opposite to the air flow direction in the air hexagonal pipe; the secondary heat exchanger adopts a mode that an air hexagonal pipe for circulating cold air surrounds a flue gas hexagonal pipe from six sides, and the periphery of the whole flue gas hexagonal pipe is wrapped in the cold air, so that secondary heat recovery is carried out on the flue gas after primary recovery to a greater extent;

the boiler water inlet is communicated with the water outlet of the cooling water square pipe, and the water inlet of the cooling water square pipe is communicated with a water inlet source; the boiler smoke port is communicated with the smoke inlet of the smoke square pipe, the smoke outlet of the smoke square pipe is communicated with the smoke inlet of the smoke hexagonal pipe, and the smoke outlet of the smoke hexagonal pipe is communicated with the smoke outlet; the air inlet of the air hexagonal pipe is communicated with the boiler air supply system, and the air outlet of the air hexagonal pipe is communicated with the boiler air inlet; the water outlet of the boiler is communicated to a hot water user; the hot water after primary recovery and the hot air after secondary recovery enter the boiler for recycling, so that the recycling of the heat after recovery is ensured, and the energy consumption of the boiler is saved.

Preferably, the outermost layer that the side pipe tied in a bundle in one-level heat exchanger still wraps up has the pipe wall to be equipped with the outside side pipe of intermediate layer cavity, and the both ends of intermediate layer cavity communicate respectively to cooling water side pipe water inlet and cooling water side pipe delivery port, and the effect of outside side pipe is retrieved the heat of the outer flue gas side pipe radiation in the one-level heat exchanger, under the prerequisite of fully guaranteeing recycle rate, has guaranteed that the temperature of one-level heat exchanger shell can not rise because of long-time use, has also guaranteed that operational environment's temperature can not receive the influence of heat exchanger.

More preferably, the inner layer of the interlayer cavity is made of a heat conducting material, and the outer layer of the interlayer cavity is made of a non-heat conducting material.

Preferably, the outermost layers of the hexagonal tube bundles in the secondary heat exchanger are all air hexagonal tubes; the outermost layer is the air hexagonal pipe, has guaranteed that the temperature of second grade heat exchanger shell can not rise because of long-time use, has also guaranteed that the temperature of service environment can not receive the influence of heat exchanger.

More preferably, the outermost layer of the hexagonal tube bundle in the secondary heat exchanger is further wrapped with soundproof cotton; because the heat exchange air in the air hexagonal pipe circulates continuously and rapidly, certain noise can be generated, the noise of the secondary heat exchanger is reduced by wrapping the soundproof cotton on the outermost layer to adsorb the air flowing noise, and the influence on a user is reduced.

Preferably, the height of the water inlet of the cooling water square pipe in the primary heat exchanger is higher than the height of the water outlet of the cooling water square pipe; the height of the air outlet of the air hexagonal pipe in the secondary heat exchanger is higher than that of the air inlet of the air hexagonal pipe; the water inlet of the primary heat exchanger is higher than the water outlet, so that the cooling water can flow, and the air outlet of the secondary heat exchanger is higher than the air inlet, so that the air can flow in the pipeline after being heated, lifted and expanded.

Preferably, the inner pipe walls of the flue gas square pipe and the flue gas hexagonal pipe are coated with anticorrosive paint; the corrosion of corrosive gas in the flue gas to the pipeline is prevented, and the durability of the pipeline is enhanced.

The beneficial effects of the utility model are as follows:

according to the utility model, the primary heat recovery is carried out on the boiler flue gas through the arrangement of the square pipes side by side and the reverse flow of the flue gas and cooling water in the pipes in the primary heat exchanger, and then the secondary heat recovery is carried out through the hexagonal pipes of the secondary heat exchanger, wherein the hexagonal pipes are used for circulating the flue gas, and the hexagonal pipes are wrapped in an omnibearing manner, so that the full heat recovery of the boiler flue gas is completed in a compact structure, and the problems of energy waste and environmental pollution during the high-temperature flue gas emission of the small-sized boiler and the household boiler are solved.

Drawings

FIG. 1 is a schematic diagram of a heat pipe heat exchanger for recovering flue gas waste heat of a boiler;

FIG. 2 is an enlarged sectional view of A-A of FIG. 1;

fig. 3 is a schematic cross-sectional view of a bundling end.

1, a boiler; 2. recovering the heat pipe exchanger; 3. a boiler water inlet; 4. a boiler water outlet; 5. a boiler air inlet; 6. a boiler flue gas port; 7. a primary heat exchanger; 8. a secondary heat exchanger; 9. square tubes; 10. a smoke square tube; 11. cooling water square tubes; 12. a smoke inlet of the smoke square tube; 13. a smoke outlet of the smoke square tube; 14. cooling water square pipe water inlet; 15. a water outlet of the cooling water square tube; 16. a hexagonal tube; 17. a flue gas hexagonal tube; 18. an air hexagonal tube; 19. a smoke inlet of the smoke hexagonal pipe; 20. a smoke outlet of the smoke hexagonal pipe; 21. an air inlet of the air hexagonal pipe; 22. an air outlet of the air hexagonal pipe; 23. an interlayer cavity; 24. an outer square tube; 25. and (5) soundproof cotton.

Detailed Description

The following description of the related art will be made apparent to, and is not intended to limit the scope of, the embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Referring to fig. 1 to 3, a boiler flue gas waste heat recovery heat pipe heat exchanger includes: the boiler 1 is provided with a boiler water inlet 3, a boiler water outlet 4, a boiler air inlet 5 and a boiler flue gas port 6, the recovery heat pipe heat exchanger 2 is in a cuboid shape, the upper part of the recovery heat pipe heat exchanger 2 is provided with a cuboid-shaped primary heat exchanger 7, and the lower part of the recovery heat pipe heat exchanger 2 is provided with a cuboid-shaped secondary heat exchanger 8;

a plurality of long and straight square tubes 9 with square cross sections are clustered side by side in the primary heat exchanger 7, the square tubes 9 are divided into a flue gas square tube 10 and a cooling water square tube 11, the flue gas square tube 10 is used as a flue gas channel, the cooling water square tube 11 is used as a water flow channel, two clustered ends are respectively arranged at two ends of the square tube 9, two one-way and multi-tube interfaces are arranged in the clustered ends, the clustered ends respectively communicate all the two ends of the flue gas square tube 10 with a flue gas square tube smoke inlet 12 and a flue gas square tube smoke outlet 13, the clustered ends respectively communicate all the two ends of the cooling water square tube 11 with a cooling water square tube water inlet 14 and a cooling water square tube water outlet 15, the flue gas square tube 10 and the cooling water square tube 11 are alternately and closely arranged at intervals, the flue gas square tube 10 and the cooling water square tube 11 are made of heat conducting materials, and the flue gas flow direction in the flue gas square tube 10 is opposite to the water flow direction in the cooling water square tube 11; in the primary heat exchanger 7, heat in the flue gas is recovered once in a mode that water flow is adjacent to the flue gas and objects flow, and the flue gas square pipes 10 and the cooling water square pipes 11 are staggered and abutted at intervals in a parallel cluster arrangement mode of the square pipes 9, so that heat exchange is more sufficient, and in actual use, the heat exchange efficiency can be enhanced again in a mode that the flue gas square pipes 10 and the cooling water square pipes 11 share adjacent pipe walls;

a plurality of long hexagonal pipes 16 with regular hexagonal cross sections are clustered side by side in the secondary heat exchanger 8, the hexagonal pipes 16 are divided into a flue gas hexagonal pipe 17 and an air hexagonal pipe 18, the flue gas hexagonal pipe 17 is used as a flue gas channel, the air hexagonal pipe 18 is used as an air channel, clustered ends are respectively arranged at two clustered ends of the hexagonal pipe 16, the clustered ends respectively communicate two ends of all the flue gas hexagonal pipes 17 with a flue gas hexagonal pipe smoke inlet 19 and a flue gas hexagonal pipe smoke outlet 20, the clustered ends respectively communicate two ends of all the air hexagonal pipes 18 with an air hexagonal pipe air inlet 21 and an air hexagonal pipe air outlet 22, six side surfaces of the flue gas hexagonal pipe 17 are all arranged around the side surface of one air hexagonal pipe 18 in a close-abutting arrangement, the flue gas hexagonal pipe 17 and the air hexagonal pipe 18 are made of heat conducting materials, and the flue gas flow direction in the flue gas hexagonal pipe 17 is opposite to the air flow direction in the air hexagonal pipe 18; the secondary heat exchanger 8 adopts a mode that an air hexagonal pipe 18 for circulating cold air surrounds a flue gas hexagonal pipe 17 from six sides, and the periphery of the whole flue gas hexagonal pipe 17 is wrapped in the cold air, so that secondary heat recovery is carried out on the flue gas after primary recovery to a greater extent;

the boiler water inlet 3 is communicated with a cooling water square pipe water outlet 15, and the cooling water square pipe water inlet 14 is communicated with a water inlet source; the boiler flue gas port 6 is communicated with a flue gas square tube flue gas inlet 12, a flue gas square tube flue gas outlet 13 is communicated with a flue gas hexagonal tube flue gas inlet 19, and a flue gas hexagonal tube flue gas outlet 20 is communicated with a flue gas outlet; the air hexagonal pipe air inlet 21 is communicated with the boiler air supply system, and the air hexagonal pipe air outlet 22 is communicated with the boiler air inlet 5; the boiler water outlet 4 is communicated to a hot water user; the hot water after primary recovery and the hot air after secondary recovery enter the boiler 1 for recycling, so that the recycling of the heat after recovery is ensured, and the energy consumption of the boiler 1 is saved.

Further, the outermost layer that side pipe 9 tied in a bundle in one-level heat exchanger 7 still wraps up has the outside square tube 24 that the pipe wall is equipped with intermediate layer cavity 23, and the both ends of intermediate layer cavity 23 communicate respectively to cooling water side pipe water inlet 14 and cooling water side pipe delivery port 15, and the effect of outside square tube 24 is retrieved the heat that the outer layer flue gas side pipe 10 radiated in one-level heat exchanger 7, under the prerequisite of fully guaranteeing recycle rate, has guaranteed that the temperature of one-level heat exchanger 7 shell can not rise because of long-time use, has also guaranteed that operational environment's temperature can not receive the influence of heat exchanger.

Further, the inner layer of the interlayer cavity 23 is made of a heat conducting material, and the outer layer of the interlayer cavity 23 is made of a non-heat conducting material.

Further, the outermost layers of the hexagonal tubes 16 in the secondary heat exchanger 8 are all air hexagonal tubes 18; the outermost layers are all air hexagonal pipes 18, so that the temperature of the outer shell of the secondary heat exchanger 8 is guaranteed not to rise due to long-time use, and the temperature of the use environment is guaranteed not to be influenced by the heat exchanger.

Furthermore, the outermost layer of the hexagonal tube 16 bundle in the secondary heat exchanger 8 is also wrapped with soundproof cotton 25; due to the continuous rapid circulation of the heat exchange air in the air hexagonal tube 18, a certain noise may be generated, and the noise of the secondary heat exchanger 8 is reduced by wrapping the soundproof cotton 25 on the outermost layer to absorb the air flowing noise, thereby reducing the influence on the user.

Further, the height of the water inlet 14 of the cooling water square tube in the primary heat exchanger 7 is higher than the height of the water outlet 15 of the cooling water square tube; the height of the air outlet 22 of the air hexagonal pipe in the secondary heat exchanger 8 is higher than that of the air inlet 21 of the air hexagonal pipe; the water inlet of the primary heat exchanger 7 is higher than the water outlet, so that the cooling water can flow, and the air outlet of the secondary heat exchanger 8 is higher than the air inlet, so that the air can flow in the pipeline after being heated, lifted and expanded.

Further, the inner pipe walls of the flue gas square pipe 10 and the flue gas hexagonal pipe 17 are coated with anti-corrosion paint; the corrosion of corrosive gas in the flue gas to the pipeline is prevented, and the durability of the pipeline is enhanced.

In summary, the primary heat recovery is performed on the boiler flue gas by arranging the primary heat exchangers side by side through the square pipes and reversely flowing the flue gas and cooling water in the pipes, and then the secondary heat recovery is performed by wrapping one hexagonal pipe circulating the flue gas in an omnibearing manner through a plurality of hexagonal pipes circulating cold air of the secondary heat exchangers, so that the full heat recovery of the boiler flue gas is completed in a compact structure, the problems of energy waste and environmental pollution during high-temperature flue gas emission of the small-sized boiler and the household boiler are solved, and the secondary heat recovery device has wide application prospect.

It is emphasized that: the above embodiments are merely preferred embodiments of the present utility model, and the present utility model is not limited in any way, and any simple modification, equivalent variation and modification made to the above embodiments according to the technical substance of the present utility model still fall within the scope of the technical solution of the present utility model.

Claims

1. A boiler flue gas waste heat recovery heat pipe heat exchanger comprising: boiler (1), recovery heat pipe heat exchanger (2), boiler (1) are equipped with boiler water inlet (3), boiler delivery port (4), boiler air inlet (5), boiler flue gas mouth (6), its characterized in that: the recovery heat pipe heat exchanger (2) is cuboid, a cuboid primary heat exchanger (7) is arranged at the upper part of the recovery heat pipe heat exchanger (2), and a cuboid secondary heat exchanger (8) is arranged at the lower part of the recovery heat pipe heat exchanger (2);

a plurality of long straight square tubes (9) with square cross sections are clustered side by side in the primary heat exchanger (7), the square tubes (9) are divided into smoke square tubes (10) and cooling water square tubes (11), the smoke square tubes (10) are used as smoke channels, the cooling water square tubes (11) are used as water channels, clustered ends are respectively arranged at two ends of each square tube (9), two one-way multiple tube interfaces are arranged in each clustered end, two ends of all the smoke square tubes (10) are respectively communicated to a smoke inlet (12) and a smoke square tube smoke outlet (13) by the clustered ends, two ends of all the cooling water square tubes (11) are respectively communicated to a cooling water square tube water inlet (14) and a cooling water square tube water outlet (15), the smoke square tubes (10) and the cooling water square tubes (11) are arranged in a staggered and close manner at intervals, the smoke square tubes (10) and the cooling water square tubes (11) are made of heat conducting materials, and the flow direction of smoke in the smoke square tubes (10) is opposite to the cooling water flow direction in the cooling water square tubes (11);

a plurality of long hexagonal pipes (16) with regular hexagons in cross section are clustered side by side in the secondary heat exchanger (8), the hexagonal pipes (16) are divided into a flue gas hexagonal pipe (17) and an air hexagonal pipe (18), the flue gas hexagonal pipe (17) is used as a flue gas channel, the air hexagonal pipe (18) is used as an air channel, clustered ends are respectively arranged at two clustered ends of the hexagonal pipe (16), the clustered ends respectively communicate all the two ends of the flue gas hexagonal pipe (17) with a flue gas hexagonal pipe smoke inlet (19) and a flue gas hexagonal pipe smoke outlet (20), the clustered ends respectively communicate all the two ends of the air hexagonal pipe (18) with an air hexagonal pipe air inlet (21) and an air hexagonal pipe air outlet (22), six sides of the flue gas hexagonal pipe (17) are all round sides which are closely arranged with one air hexagonal pipe (18), the hexagonal pipe (17) and the air hexagonal pipe (18) are made of heat conducting materials, and the flue gas flowing in the directions of the flue gas hexagonal pipe (17) are opposite to the air flow directions of the flue gas in the hexagonal pipe (18);

the boiler water inlet (3) is communicated with a cooling water square pipe water outlet (15), and the cooling water square pipe water inlet (14) is communicated with a water inlet source; the boiler flue gas port (6) is communicated with the flue gas square tube flue gas inlet (12), the flue gas square tube flue gas outlet (13) is communicated with the flue gas hexagonal tube flue gas inlet (19), and the flue gas hexagonal tube flue gas outlet (20) is communicated with the flue gas outlet; the air hexagonal pipe air inlet (21) is communicated with the boiler air supply system, and the air hexagonal pipe air outlet (22) is communicated with the boiler air inlet (5); the boiler water outlet (4) is communicated to a hot water user.

2. The boiler flue gas waste heat recovery heat pipe heat exchanger according to claim 1, wherein the outermost layer of the square pipe (9) bundle in the primary heat exchanger (7) is further wrapped with an outer square pipe (24) with an interlayer cavity (23) on the pipe wall, and two ends of the interlayer cavity (23) are respectively communicated with a cooling water square pipe water inlet (14) and a cooling water square pipe water outlet (15).

3. A boiler flue gas waste heat recovery heat pipe heat exchanger according to claim 2, wherein the inner layer of the interlayer cavity (23) is made of a heat conducting material, and the outer layer of the interlayer cavity (23) is made of a non-heat conducting material.

4. A boiler flue gas waste heat recovery heat pipe heat exchanger according to claim 1, characterized in that the outermost layers of the hexagonal pipe (16) bundles in the secondary heat exchanger (8) are all air hexagonal pipes (18).

5. The heat pipe heat exchanger for recovering flue gas waste heat of boiler according to claim 4, wherein the outermost layer of the hexagonal pipe (16) bundle in the secondary heat exchanger (8) is further wrapped with soundproof cotton (25).

6. The boiler flue gas waste heat recovery heat pipe heat exchanger according to claim 1, wherein the height of a cooling water square pipe water inlet (14) in the primary heat exchanger (7) is higher than the height of a cooling water square pipe water outlet (15); the height of an air outlet (22) of the air hexagonal pipe in the secondary heat exchanger (8) is higher than that of an air inlet (21) of the air hexagonal pipe.

7. A boiler flue gas waste heat recovery heat pipe heat exchanger according to claim 1, characterized in that the inner pipe walls of the flue gas square pipe (10) and the flue gas hexagonal pipe (17) are coated with anticorrosive paint.