Flue gas waste heat recovery device of gas-fired hot water boiler

Abstract

The utility model relates to a flue gas waste heat recovery device of a gas-fired hot water boiler, and aims to solve the technical problems that the existing coiled pipes are arranged in a stacked manner, so that the gathering effect on heat is inconvenient to generate, the heat exchange efficiency is lower, and the rapid and sufficient heat exchange is not facilitated, and the flue gas waste heat recovery device comprises a heat exchange box in which a heat exchange cavity is formed, a heat exchange module is detachably arranged in the heat exchange cavity, the heat exchange module comprises a first heat exchange assembly and a second heat exchange assembly which are arranged in a staggered and crossed mode, the first heat exchange assembly comprises multiple sets of first S-shaped heat exchange pipes which are transversely arranged at equal intervals, and the second heat exchange assembly comprises multiple sets of second S-shaped heat exchange pipes which are longitudinally arranged at equal intervals; the first snakelike heat exchange pipe and the second snakelike heat exchange pipe are arranged in a staggered and crossed mode, a multi-point heat gathering area with the function of promoting the heat exchange effect is formed at the crossed point of the first snakelike heat exchange pipe and the second snakelike heat exchange pipe, and the first snakelike heat exchange pipe and the second snakelike heat exchange pipe are each provided with a straight pipe part and a bent part. The heat exchanger has the advantage of improving the heat exchange efficiency.

Description

Technical Field

[0001] The utility model relates to the technical field of waste heat recovery devices, in particular to a flue gas waste heat recovery device for a gas-fired hot water boiler. Background Art

[0002] A boiler is an energy conversion device. The energy input into the boiler includes chemical energy and electrical energy in the fuel. The boiler outputs steam, high-temperature water or organic heat carrier with a certain amount of thermal energy. The original meaning of "pot" refers to a water container heated on fire, and "furnace" refers to a place where fuel is burned. The boiler consists of two major parts: the pot and the furnace. The hot water or steam generated in the boiler can directly provide the required thermal energy for industrial production and people's lives, and can also be converted into mechanical energy through a steam power device.

[0003] At present, a large amount of flue gas is generated when a gas-fired hot water boiler is working, in which a large amount of heat is dissipated with the flue gas, resulting in low thermal efficiency of the gas-fired hot water boiler. Therefore, in order to improve the thermal efficiency, a waste heat recovery device is usually used to recover the heat in the flue gas, so as to preheat the front water supply equipment of the gas-fired hot water boiler. When a traditional waste heat recovery device is used, it is mainly through stacking serpentine tubes in a preheating box, so that the high-temperature flue gas passes through the serpentine tubes and cooperates with heat exchange plates to achieve heat exchange with the water in the preheating box. However, due to the stacking arrangement of the serpentine tubes, it is not easy to produce a concentration effect on the heat, and it only cooperates with the heat exchange plates to conduct heat at different gradients. The heat exchange efficiency is low, which is not conducive to achieving rapid and sufficient heat exchange. In view of this, we propose a waste heat recovery device for flue gas from a gas-fired hot water boiler. Utility Model Content

[0004] The purpose of the utility model is to overcome the deficiencies of the prior art, meet actual needs, and provide a gas hot water boiler flue gas waste heat recovery device to solve the technical problems that the current serpentine tube stacking arrangement is not convenient for heat accumulation effect, the heat exchange efficiency is low, and it is not conducive to achieving rapid and sufficient heat exchange.

[0005] In order to achieve the purpose of the utility model, the technical solution adopted by the utility model is: designing a flue gas waste heat recovery device for a gas hot water boiler, including a heat exchange box with a heat exchange cavity formed therein;

[0006] A heat exchange module is detachably arranged inside the heat exchange cavity;

[0007] The heat exchange module comprises a first heat exchange component and a second heat exchange component which are staggered and cross-arranged;

[0008] The first heat exchange component includes a plurality of groups of serpentine heat exchange tubes 1 arranged at equal intervals in the transverse direction, and the second heat exchange component includes a plurality of groups of serpentine heat exchange tubes 2 arranged at equal intervals in the longitudinal direction. The serpentine heat exchange tubes 1 and 2 are arranged in an offset and cross manner, and a multi-point heat accumulation area is formed at the intersection of the serpentine heat exchange tubes 1 and 2 to promote the heat exchange effect.

[0009] Preferably, the serpentine heat exchange tube 1 and the serpentine heat exchange tube 2 both have a straight tube portion and a bent portion, and the straight tube portion and the bent portion are sequentially connected to form a serpentine structure.

[0010] Preferably, a heat storage cavity is opened inside the straight tube part of the serpentine heat exchange tube 1 and the serpentine heat exchange tube 2, and a spiral slow flow part is arranged in a ring array on the inner wall of the heat storage cavity. The spiral slow flow part is fixedly connected to the inner wall of the heat storage cavity, and the spiral slow flow part has an arc structure in the surface direction.

[0011] Preferably, the upper end surface and one side of the heat exchange box are equidistantly formed with through hole 1 and through hole 2 connected to the heat exchange cavity, and the upper end surface and one side of the heat exchange box are equidistantly formed with mounting hole 1 and mounting hole 2 connected to the heat exchange cavity.

[0012] Preferably, a smoke inlet hole one is detachably installed in the through hole one, one end of the serpentine heat exchange tube one is detachably connected to the smoke inlet hole one, a smoke inlet hole two is detachably installed in the through hole two, one end of the serpentine heat exchange tube two is detachably connected to the smoke inlet hole two, a smoke discharge hole one is detachably installed in the mounting hole one, the other end of the serpentine heat exchange tube one is detachably connected to the smoke discharge hole one, a smoke discharge hole two is detachably installed in the mounting hole two, the other end of the serpentine heat exchange tube two is detachably connected to the smoke discharge hole two.

[0013] Preferably, a drainage hole connected to the heat exchange chamber is provided at the bottom of one side of the heat exchange box, a drainage pipe is detachably installed in the drainage hole, and support feet for supporting effect are formed at the four corners of the lower end surface of the heat exchange box.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] 1. By arranging a heat exchange module in the heat exchange cavity, the mutually staggered and cross-arranged serpentine heat exchange tube 1 and serpentine heat exchange tube 2 are conducive to forming a multi-point heat accumulation area with a heat exchange effect at the intersection of the serpentine heat exchange tube 1 and the serpentine heat exchange tube 2, so that the heat in the flue gas can form multiple high heat sources in the heat exchange cavity in a lattice manner, thereby improving the heat exchange efficiency and further improving the waste heat recovery effect. Moreover, since the serpentine heat exchange tube 1 and the serpentine heat exchange tube 2 are arranged in multiple groups at equal intervals, multiple groups of serpentine heat exchange tubes 1 and serpentine heat exchange tubes 2 form a three-dimensional matrix of high heat sources at the intersection, which is conducive to further improving the heat exchange efficiency, thereby further improving the waste heat recovery effect.

[0016] 2. By arranging spiral slow flow parts in a circular array in the heat storage chamber, the spiral structure of the spiral slow flow part is conducive to slowing down the flow of flue gas, thereby delaying the flow speed of flue gas and extending its heat exchange time, thereby improving the heat exchange efficiency, and the spiral structure of the spiral slow flow part is conducive to gathering the flue gas on the inside, and guiding the flue gas to flow toward the middle of the heat storage chamber on the outside of the spiral slow flow part, so that the flue gas forms a linear accumulation in the middle of the heat storage chamber, so that the heat of the flue gas is concentrated and diffused toward the surroundings in the form of heat radiation, so that the water in the heat exchange box is heated by heat radiation, which is conducive to further improving the heat exchange efficiency and effect, and realizing rapid and sufficient heat exchange. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the utility model;

[0018] Figure 2 This is a schematic diagram of the internal structure of the heat exchange box of the utility model;

[0019] Figure 3 This is a schematic diagram of the structure of the heat exchange module of the utility model;

[0020] Figure 4 This is a schematic diagram of the structure of the first heat exchange component and the second heat exchange component of the utility model in a separated state;

[0021] Figure 5 This is a schematic diagram of the structure of the serpentine heat exchange tube 2 of the utility model;

[0022] Figure 6 For this utility model Figure 5 A magnified schematic diagram of the structure in the middle.

[0023] In the figure: 1. heat exchange box; 2. heat exchange chamber; 3. support leg; 4. drain pipe; 5. smoke inlet hole 1; 6. smoke exhaust hole 1; 7. smoke inlet hole 2; 8. smoke exhaust hole 2; 9. heat exchange module; 10. first heat exchange component; 1001. serpentine heat exchange tube 1; 11. second heat exchange component; 1101. serpentine heat exchange tube 2; 1102. heat storage chamber; 1103. spiral slow flow part. DETAILED DESCRIPTION

[0024] The utility model is further described below in conjunction with the accompanying drawings and embodiments:

[0025] Example 1: A gas hot water boiler flue gas waste heat recovery device, see Figure 1-Figure 5 , including a heat exchange box 1 with a heat exchange cavity 2 formed therein, a heat exchange module 9 is detachably arranged inside the heat exchange cavity 2, the heat exchange module 9 includes a first heat exchange component 10 and a second heat exchange component 11 which are staggered and cross-arranged, the first heat exchange component 10 includes a plurality of groups of serpentine heat exchange tubes 1001 which are equidistantly arranged laterally, the second heat exchange component 11 includes a plurality of groups of serpentine heat exchange tubes 1101 which are equidistantly arranged longitudinally, the serpentine heat exchange tubes 1001 and 1101 are staggered and cross-arranged with each other, and a multi-point heat accumulation area having the function of promoting the heat exchange effect is formed at the intersection of the serpentine heat exchange tubes 1001 and 1101.

[0026] See also Figure 4-Figure 6 The serpentine heat exchange tube 1001 and the serpentine heat exchange tube 2 1101 both have a straight tube portion and a bent portion, which are connected in sequence to form a serpentine structure. The straight tube portions of the serpentine heat exchange tube 1001 and the serpentine heat exchange tube 2 1101 are both provided with a heat storage chamber 1102 inside, and a spiral slow flow portion 1103 is arranged in a circular array on the inner wall of the heat storage chamber 1102. The spiral slow flow portion 1103 is fixedly connected to the inner wall of the heat storage chamber 1102, and the spiral slow flow portion 1103 is an arc-shaped structure in the surface direction.

[0027] See also Figure 1 , Figure 2 and Figure 4The upper end surface and one side of the heat exchange box 1 are respectively equidistantly provided with a through hole 1 and a through hole 2 connected to the heat exchange chamber 2, and the upper end surface and one side of the heat exchange box 1 are respectively equidistantly provided with a mounting hole 1 and a mounting hole 2 connected to the heat exchange chamber 2, a flue gas discharge hole 5 is detachably installed in the through hole 1, one end of the serpentine heat exchange tube 1001 is detachably connected to the flue gas discharge hole 15, a flue gas discharge hole 2 7 is detachably installed in the through hole 2, one end of the serpentine heat exchange tube 1101 is detachably connected to the flue gas discharge hole 2 7, a smoke exhaust hole 1 6 is detachably installed in the mounting hole 1, the other end of the serpentine heat exchange tube 1001 is detachably connected to the smoke exhaust hole 1 6, a smoke exhaust hole 2 8 is detachably installed in the mounting hole 2, and the other end of the serpentine heat exchange tube 1101 is detachably connected to the smoke exhaust hole 2 8.

[0028] See also Figure 1 and Figure 2 A drainage hole connected to the heat exchange chamber 2 is provided at the bottom of one side of the heat exchange box 1, and a drainage pipe 4 is detachably installed in the drainage hole. The four corners of the lower end surface of the heat exchange box 1 are structured with supporting feet 3 for supporting effect. The utility model solves the technical problem that the current serpentine tube stacking arrangement is not convenient for generating heat accumulation effect, the heat exchange efficiency is low, and it is not conducive to achieving rapid and sufficient heat exchange by setting the heat exchange module 9.

[0029] Working principle: When in use, the heat exchange box 1 is filled with water in advance, and then the flue gas is discharged into the serpentine heat exchange tube 1 1001 and the serpentine heat exchange tube 2 1101 through the flue gas discharge hole 1 5 and the flue gas discharge hole 2 7. The spiral structure of the spiral slow flow part 1103 is conducive to the slow flow effect of the flue gas, thereby delaying the flow speed of the flue gas, extending the heat exchange time, and thus improving the heat exchange efficiency. The spiral structure of the spiral slow flow part 1103 is conducive to gathering the flue gas on the inside, and guiding the flue gas to flow toward the middle of the heat storage chamber 1102 on the outside of the spiral slow flow part 1103, so that the flue gas forms a linear accumulation in the middle of the heat storage chamber 1102, so that the heat of the flue gas is concentrated and diffused to the surroundings in the form of heat radiation, thereby heat radiation to the water in the heat exchange box 1 Heating is performed, and the mutually staggered and crossed arrangement of the serpentine heat exchange tube 1 1001 and the serpentine heat exchange tube 2 1101 is conducive to forming a multi-point heat accumulation area with the function of promoting heat exchange effect at the intersection of the serpentine heat exchange tube 1 1001 and the serpentine heat exchange tube 2 1101, so that the heat in the flue gas can form multiple high heat sources in the form of a lattice inside the heat exchange chamber 2, thereby improving the heat exchange efficiency and further improving the waste heat recovery effect. Moreover, since the serpentine heat exchange tube 1 1001 and the serpentine heat exchange tube 2 1101 are arranged in multiple groups at equal intervals, multiple groups of serpentine heat exchange tubes 1001 and serpentine heat exchange tubes 1101 form a three-dimensional matrix of high heat sources at the intersection, which is conducive to further improving the heat exchange efficiency. After the heat exchange is completed, the flue gas is discharged through the smoke exhaust hole 1 6 and the smoke exhaust hole 2 8.

[0030] The embodiments of the present invention disclose preferred embodiments, but are not limited thereto. A person skilled in the art can easily understand the spirit of the present invention based on the above embodiments and make different extensions and changes. However, as long as they do not deviate from the spirit of the present invention, they are all within the protection scope of the present invention.

Claims

1. A gas hot water boiler flue gas waste heat recovery device, characterized in that: It comprises a heat exchange box (1) having a heat exchange cavity (2) formed therein; A heat exchange module (9) is detachably arranged inside the heat exchange chamber (2); The heat exchange module (9) comprises a first heat exchange component (10) and a second heat exchange component (11) which are staggered and cross-arranged; The first heat exchange component (10) includes a plurality of groups of serpentine heat exchange tubes (1001) arranged equidistantly in the transverse direction, and the second heat exchange component (11) includes a plurality of groups of serpentine heat exchange tubes (1101) arranged equidistantly in the longitudinal direction. The serpentine heat exchange tubes (1001) and the serpentine heat exchange tubes (1101) are arranged in a staggered and cross-arranged manner, and a multi-point heat accumulation area having the function of promoting the heat exchange effect is formed at the intersection of the serpentine heat exchange tubes (1001) and the serpentine heat exchange tubes (1101).

2. A gas hot water boiler flue gas waste heat recovery device as claimed in claim 1, characterized in that: The serpentine heat exchange tube 1 (1001) and the serpentine heat exchange tube 2 (1101) both have a straight tube portion and a bent portion, and the straight tube portion and the bent portion are sequentially connected to form a serpentine structure.

3. A gas hot water boiler flue gas waste heat recovery device as claimed in claim 2, characterized in that: A heat storage chamber (1102) is provided inside the straight tube portion of the serpentine heat exchange tube 1 (1001) and the serpentine heat exchange tube 2 (1101), and spiral slow flow portions (1103) are arranged in a ring array on the inner wall of the heat storage chamber (1102), and the spiral slow flow portions (1103) are fixedly connected to the inner wall of the heat storage chamber (1102), and the spiral slow flow portions (1103) are in an arc-shaped structure in the surface direction.

4. A gas hot water boiler flue gas waste heat recovery device as claimed in claim 1, characterized in that: The upper end surface and one side of the heat exchange box (1) are respectively provided with a first through hole and a second through hole connected to the heat exchange chamber (2) at equal distances, and the upper end surface and one side of the heat exchange box (1) are respectively provided with a first mounting hole and a second mounting hole connected to the heat exchange chamber (2) at equal distances.

5. A gas hot water boiler flue gas waste heat recovery device as claimed in claim 4, characterized in that: A smoke inlet hole (5) is detachably installed in the through hole one, and one end of the serpentine heat exchange tube (1001) is detachably connected to the smoke inlet hole (5). A smoke inlet hole (7) is detachably installed in the through hole two, and one end of the serpentine heat exchange tube (1101) is detachably connected to the smoke inlet hole (7). A smoke discharge hole (6) is detachably installed in the mounting hole one, and the other end of the serpentine heat exchange tube (1001) is detachably connected to the smoke discharge hole (6). A smoke discharge hole (8) is detachably installed in the mounting hole two, and the other end of the serpentine heat exchange tube (1101) is detachably connected to the smoke discharge hole (8).

6. A gas hot water boiler flue gas waste heat recovery device as claimed in claim 1, characterized in that: A drainage hole connected to the heat exchange chamber (2) is provided at the bottom of one side of the heat exchange box (1), a drainage pipe (4) is detachably installed in the drainage hole, and support feet (3) are formed at the four corners of the lower end surface of the heat exchange box (1) to provide a supporting effect.

Images