Boiler flue gas waste heat recovery equipment

Abstract

The utility model relates to boiler flue gas waste heat recovery equipment which comprises a waste heat recovery pipe, boiler tail gas treatment equipment, an inner core body and a heat exchange pipe, the waste heat recovery pipe is vertically arranged, the boiler tail gas treatment equipment is connected to the top end of the waste heat recovery pipe and is used for filtering and purifying filtered tail gas, and the inner core body is arranged in the waste heat recovery pipe. The heat exchange pipe is arranged in an annular cavity channel formed between the inner wall of the waste heat recovery pipe and the outer wall of the inner core body, and the flow inlet end and the flow outlet end of the heat exchange pipe both penetrate and extend to the outer portion of the waste heat recovery pipe. The boiler flue gas waste heat recovery equipment is vertically arranged, high-temperature flue gas can flow upwards under the action of a heat convection principle, the flue gas can automatically flow upwards in the waste heat recovery pipe in combination with the flow guide action provided when the boiler flue gas is discharged, additional flow guide equipment does not need to be arranged, the equipment cost investment is saved, and the boiler flue gas waste heat recovery equipment is suitable for large-scale popularization and application. And meanwhile, miniaturization of equipment is facilitated.

Description

Technical Field

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

[0002] Boiler flue gas refers to the gas mixture generated during the boiler combustion process, mainly including carbon dioxide, water vapor, nitrogen, oxygen and various combustion products, such as carbon monoxide, nitrogen oxides, sulfur oxides, particulate matter, etc. When the boiler flue gas is discharged, the flue gas needs to be treated and meet the emission standards before it can be discharged.

[0003] Secondly, boiler flue gas contains a large amount of heat. In traditional technology, boiler flue gas is directly discharged to the outside after treatment, and the large amount of heat contained in it is discharged into the air, which not only causes thermal pollution, but also causes waste of thermal energy. Utility Model Content

[0004] The purpose of the utility model is to provide a boiler flue gas waste heat recovery device, which effectively solves the problems raised in the above background technology.

[0005] In order to achieve the above-mentioned purpose, the present utility model provides the following technical solutions.

[0006] A boiler flue gas waste heat recovery device includes a waste heat recovery pipe, a boiler exhaust gas treatment device, an inner core and a heat exchange pipe. The waste heat recovery pipe is arranged vertically, and the boiler exhaust gas treatment device is connected to the top of the waste heat recovery pipe for filtering and purifying the filtered exhaust gas. The inner core is arranged in the waste heat recovery pipe and extends vertically. The heat exchange pipe is arranged in an annular cavity formed between the inner wall of the waste heat recovery pipe and the outer wall of the inner core, and the inlet end and the discharge end of the heat exchange pipe both extend through and extend to the outside of the waste heat recovery pipe.

[0007] It can be seen that the flue gas flows vertically upward along the annular cavity between the inner wall of the waste heat recovery tube and the outer wall of the inner core, and water is supplied into the heat exchange tube through the inlet end. When the high-temperature flue gas in the annular cavity is distributed outside the heat exchange tube, the heat can be effectively exchanged to the water in the heat exchange tube, and the water is heated, and then the hot water is discharged through the discharge end, thereby realizing the waste heat recovery and utilization of the boiler flue gas.

[0008] In addition, the boiler flue gas waste heat recovery equipment is arranged vertically. Under the principle of heat convection, the high-temperature flue gas will flow upward. Combined with the diversion effect provided when the boiler flue gas is discharged, it is ensured that the flue gas will automatically flow upward in the waste heat recovery pipe. There is no need to install additional diversion equipment, which saves equipment cost investment and is conducive to the miniaturization of the equipment.

[0009] Furthermore, a vertically penetrating inner cavity is provided in the inner core, and a heat exchange channel is provided around the inner cavity. One end of the heat exchange channel is connected to an inlet pipe, and the other end is connected to an outlet pipe. Both the inlet pipe and the outlet pipe extend to the outside of the waste heat recovery pipe.

[0010] Furthermore, the heat exchange tube is spirally wound around the outside of the inner core, and the heat exchange channel extends in a spiral shape.

[0011] Furthermore, a plurality of heat-conducting nets are arranged at intervals from top to bottom in the inner cavity, and both the heat-conducting nets and the inner core are made of a high-thermal-conducting metal material.

[0012] Furthermore, an isolation cover is fixedly connected to the bottom end of the inner core, and the inner diameter of the isolation cover increases downwards. The bottom end of the isolation cover is fixedly connected to the inner wall of the waste heat recovery pipe. Several inlet slots are arranged in a circular array on the isolation cover, and a filter is installed in each inlet slot.

[0013] Furthermore, the boiler tail gas treatment equipment includes a treatment box, an air inlet and an exhaust port. The air inlet is arranged at the bottom of the treatment box and is connected to the top of the waste heat recovery pipe. The exhaust port is arranged at the top of the treatment box.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows.

[0015] 1. The utility model allows the flue gas to flow vertically upward along the annular cavity between the inner wall of the waste heat recovery tube and the outer wall of the inner core, and water is supplied into the heat exchange tube through the inlet end. When the high-temperature flue gas in the annular cavity is distributed outside the heat exchange tube, heat can be effectively exchanged to the water in the heat exchange tube, and then the hot water is discharged through the discharge end, thereby realizing the waste heat recovery of the boiler flue gas.

[0016] 2. The boiler flue gas waste heat recovery equipment provided by the present invention is arranged vertically. Under the action of the heat convection principle, the flue gas with high temperature will flow upward. Combined with the diversion effect provided when the boiler flue gas is discharged, it is ensured that the flue gas will automatically flow upward in the waste heat recovery pipe. There is no need to install additional diversion equipment, which saves equipment cost investment and is conducive to the miniaturization of the equipment.

[0017] 3. In the present invention, part of the flue gas enters the annular cavity, and the other part of the flue gas enters the inner cavity. The water is supplied to the heat exchange channel through the inlet pipe. The heat of the flue gas in the inner cavity will be transferred to the inner core, and the water in the heat exchange channel will be heated by heat exchange, thereby achieving additional heat recovery effect. In combination with the heat exchange tube, dual-channel heat recovery is realized, and the inner and outer peripheries are arranged with a reasonable structural layout, thereby effectively improving the efficiency of flue gas heat recovery.

[0018] 4. The flue gas in the present invention can enter the annular cavity through the inlet notch to normally heat the water in the heat exchange tube. The filter can effectively filter the particulate matter in the flue gas to prevent it from entering the annular cavity and accumulating on the outside of the heat exchange tube for a long time, thereby affecting the heat exchange efficiency. In addition, the isolation cover serves as both a filter component and a connecting piece for fixing the inner core and the waste heat recovery tube, thus killing two birds with one stone. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a three-dimensional schematic diagram of the overall structure of the utility model;

[0020] Figure 2 This is a schematic diagram of the local structure of the preheating recovery pipe in the present utility model;

[0021] Figure 3 It is a schematic cross-sectional view of a local structure in the present utility model;

[0022] Figure 4 for Figure 3 A magnified schematic diagram of the structure in the middle.

[0023] In the figure: 1. Waste heat recovery pipe; 2. Boiler exhaust gas treatment equipment; 21. Treatment box; 22. Air inlet; 23. Exhaust port; 3. Inner core; 301. Annular cavity; 4. Heat exchange tube; 41. Inlet end; 42. Discharge end; 5. Inner cavity; 51. Heat conduction network; 6. Heat exchange channel; 61. Inlet pipe; 62. Discharge pipe; 7. Isolation cover; 71. Inlet slot; 72. Filter. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0025] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms, "connection", and "installation" should be understood in a broad sense. For example, "connection" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. In addition, "communication" can be a direct connection or an indirect connection through an intermediate medium. Here, "fixed" means that the two are connected to each other and the relative position relationship after connection remains unchanged. The directional terms mentioned in the embodiments of the present invention, such as "inside", "outside", "top", "bottom", etc., are only reference to the directions of the accompanying drawings. Therefore, the directional terms used are for better and clearer explanation and understanding of the embodiments of the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present invention.

[0026] In the embodiments of the present invention, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, features specified as "first" or "second" may explicitly or implicitly include one or more of the features.

[0027] See also Figure 1-Figure 4 The utility model provides a boiler flue gas waste heat recovery device, including a waste heat recovery pipe 1, a boiler exhaust gas treatment device 2, an inner core 3 and a heat exchange pipe 4. The waste heat recovery pipe 1 is arranged vertically, and the boiler exhaust gas treatment device 2 is connected to the top of the waste heat recovery pipe 1 for filtering and purifying the filtered exhaust gas. The inner core 3 is arranged in the waste heat recovery pipe 1 and extends vertically. The heat exchange pipe 4 is arranged in an annular cavity 301 formed between the inner wall of the waste heat recovery pipe 1 and the outer wall of the inner core 3, and the inlet end 41 and the discharge end 42 of the heat exchange pipe 4 both extend through and extend to the outside of the waste heat recovery pipe 1.

[0028] When using this equipment to preheat and recover boiler flue gas, the bottom end of the waste heat recovery pipe 1 is connected to the boiler tail gas exhaust pipe, and the waste heat recovery pipe 1 is ensured to extend vertically. The tail gas discharged from the boiler tail gas exhaust pipe enters the waste heat recovery pipe 1 and flows vertically upward along the annular cavity 301 between the inner wall of the waste heat recovery pipe 1 and the outer wall of the inner core 3. At the same time, water is supplied to the heat exchange tube 4 through the inlet end 41. When the high-temperature flue gas in the annular cavity 301 and the water body distributed outside the heat exchange tube 4 can effectively exchange heat to the heat exchange tube 4, the water is heated and then the hot water is discharged through the discharge end 42, thereby realizing the waste heat recovery of the boiler flue gas, and the flue gas is finally discharged after being filtered and purified by the boiler tail gas treatment equipment 2.

[0029] In addition, the boiler flue gas waste heat recovery equipment is arranged vertically. Under the action of the heat convection principle, the high-temperature flue gas will flow upward. Combined with the diversion effect provided when the boiler flue gas is discharged, it is ensured that the flue gas will automatically flow upward in the waste heat recovery pipe 1. There is no need to install additional diversion equipment, which saves equipment cost investment and is conducive to the miniaturization of the equipment.

[0030] Specifically, a vertically through inner cavity 5 is provided in the inner core 3, and a heat exchange channel 6 is provided around the inner cavity 5 in the inner core 3. One end of the heat exchange channel 6 is connected to an inlet pipe 61, and the other end is connected to a discharge pipe 62. The inlet pipe 61 and the discharge pipe 62 both extend to the outside of the waste heat recovery pipe 1. Part of the flue gas enters the annular cavity 301, and the other part of the flue gas enters the inner cavity 5. The water body is supplied to the heat exchange channel 6 through the inlet pipe 61. The heat of the flue gas in the inner cavity 5 will be transferred to the inner core 3, and the water body in the heat exchange channel 6 will be heated by heat exchange, achieving additional heat recovery effect. In conjunction with the heat exchange pipe 4, dual-channel heat recovery is realized, and the inner and outer peripheries are arranged, and the structural layout is reasonable, which effectively improves the efficiency of flue gas heat recovery, and the heated hot water can be finally discharged from the discharge pipe 62.

[0031] Specifically, the heat exchange tube 4 is spirally coiled on the outside of the inner core 3, and the heat exchange channel 6 extends in a spiral shape. The spiral heat exchange tube 4 and the heat exchange channel 6 can increase the lead in the waste heat recovery pipe 1, thereby increasing the heating time of the water body and improving the heat recovery effect.

[0032] Specifically, a number of heat-conducting nets 51 are arranged at intervals from top to bottom in the inner cavity 5. The heat-conducting nets 51 and the inner core 3 are both made of high-thermal-conductivity metal materials, such as copper, aluminum, etc., which can efficiently transfer heat. When the flue gas passes through the heat-conducting nets 51, the heat can be transferred to the inner core 3 through the heat-conducting nets 51, thereby effectively heating the water in the heat exchange channel 6.

[0033] Specifically, the bottom end of the inner core 3 is fixedly connected to an isolation cover 7, and the inner diameter of the isolation cover 7 becomes larger as it goes downwards. The bottom end of the isolation cover 7 is fixedly connected to the inner wall of the waste heat recovery pipe 1, and a plurality of inlet slots 71 are arranged in a circular array on the isolation cover 7. A filter screen 72 is installed in each inlet slot 71. The flue gas can enter the annular cavity 301 through the inlet slot 71 to normally heat the water in the heat exchange tube 4. The filter screen 72 can effectively filter the particulate matter in the flue gas to prevent it from entering the annular cavity 301 and accumulating on the outside of the heat exchange tube 4 for a long time, thereby affecting the heat exchange efficiency. In addition, the isolation cover 7 serves as both a filter component and a connector for fixing the inner core 3 to the waste heat recovery pipe 1, killing two birds with one stone.

[0034] Specifically, the boiler exhaust gas treatment equipment 2 includes a treatment box 21, an air inlet 22 and an exhaust port 23. The air inlet 22 is arranged at the bottom of the treatment box 21 and is connected to the top of the waste heat recovery pipe 1. The exhaust port 23 is arranged at the top of the treatment box 21. The exhaust gas finally enters the treatment box 21 through the air inlet 22. The treatment box 21 is used to filter and purify the exhaust gas. After meeting the emission standards, it is discharged to the outside through the exhaust port 23 to avoid pollution to the air environment. The treatment box 21 adopts existing technology, and the specific structure and working principle are no longer repeated.

[0035] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be encompassed within the present invention. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

Claims

1. A boiler flue gas waste heat recovery device, characterized by: It comprises a waste heat recovery pipe (1), a boiler tail gas treatment device (2), an inner core (3) and a heat exchange pipe (4); The waste heat recovery pipe (1) is arranged vertically, and the boiler tail gas treatment device (2) is connected to the top of the waste heat recovery pipe (1) for filtering and purifying the filtered tail gas; The inner core (3) is arranged in the waste heat recovery pipe (1) and extends vertically; The heat exchange tube (4) is arranged in an annular cavity (301) formed between the inner wall of the waste heat recovery tube (1) and the outer wall of the inner core (3), and both the inlet end (41) and the outlet end (42) of the heat exchange tube (4) extend through to the outside of the waste heat recovery tube (1).

2. The boiler flue gas waste heat recovery device according to claim 1, characterized in that: A vertically penetrating inner cavity (5) is provided in the inner core (3), and a heat exchange channel (6) is provided in the inner core (3) surrounding the inner cavity (5); One end of the heat exchange channel (6) is connected to an inlet pipe (61), and the other end is connected to an outlet pipe (62). Both the inlet pipe (61) and the outlet pipe (62) extend through the outside of the waste heat recovery pipe (1).

3. The boiler flue gas waste heat recovery device according to claim 2, characterized in that: The heat exchange tube (4) is spirally wound around the outside of the inner core (3), and the heat exchange channel (6) extends in a spiral shape.

4. The boiler flue gas waste heat recovery device according to claim 2, characterized in that: A plurality of heat-conducting nets (51) are arranged at intervals from top to bottom in the inner cavity (5); the heat-conducting nets (51) and the inner core (3) are both made of a high-heat-conducting metal material.

5. The boiler flue gas waste heat recovery equipment according to claim 2, characterized in that: The bottom end of the inner core (3) is fixedly connected to an isolation cover (7), the inner diameter of the isolation cover (7) increases downward, and the bottom end of the isolation cover (7) is fixedly connected to the inner wall of the waste heat recovery pipe (1); A plurality of inlet slots (71) are arranged in a circular array on the isolation cover (7), and a filter screen (72) is installed in each of the inlet slots (71).

6. The boiler flue gas waste heat recovery device according to claim 1, characterized in that: The boiler tail gas treatment equipment (2) comprises a treatment box (21), an air inlet (22) and an exhaust port (23); The air inlet (22) is arranged at the bottom of the processing box (21) and is connected to the top end of the waste heat recovery pipe (1); The exhaust port (23) is arranged at the top of the processing box (21).

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