Energy transfer structure for boiler flue gas waste heat recovery

Abstract

The utility model relates to the technical field of heat exchangers, in particular to an energy transfer structure for boiler flue gas waste heat recovery, which comprises a flue gas waste heat recovery mechanism, the flue gas waste heat recovery mechanism comprises a shell, and a stirring heat absorption mechanism is fixedly connected in the shell. According to the utility model, the pipeline fan is arranged at the smoke inlet pipe, so that the flowability of smoke can be improved, meanwhile, the smoke is effectively prevented from being driven to flow back by airflow caused when the stirring heat absorption mechanism rotates, the driving effect of the airflow on the smoke is effectively prevented, the backflow risk is reduced, and the working efficiency and the stability are improved; the pipe diameter of the smoke inlet pipe is set to be smaller than the pipe diameter of the smoke outlet pipe, when smoke flows through the shell area, the smoke staying time can be prolonged, the smoke staying time in the shell area is longer, and the equipment stirring heat absorption mechanism and the waste heat sufficient recovery unit have more chances to conduct heat energy exchange and absorption with the smoke; the heat energy recovery rate is effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of heat exchangers, in particular to an energy transfer structure for recovering waste heat from boiler flue gas. Background Art

[0002] The energy transfer structure for boiler flue gas waste heat recovery is a flue gas heat exchanger. It is used to recover heat energy from boiler flue gas. The main flue gas heat exchanger establishes a heat exchange interface between the flue gas and the recovery medium, so that the high-temperature heat energy in the flue gas is transferred to the recovery medium. During the heat transfer process, the temperature of the flue gas decreases, while the temperature of the recovery medium increases, realizing the recovery and utilization of flue gas waste heat.

[0003] In order to ensure the fluidity of the flue gas, a certain distance must be maintained between the heat exchange tubes. It is inevitable that some flue gas cannot fully contact the heat exchange tubes, resulting in a decrease in heat transfer efficiency, inability to fully utilize the waste heat in the flue gas, and reduced recovery efficiency. Utility Model Content

[0004] In order to overcome the above-mentioned technical problems, the purpose of the present invention is to provide an energy transfer structure for recovering waste heat from boiler flue gas. By arranging a duct fan at the smoke inlet pipe, the fluidity of the smoke can be increased, and at the same time, the airflow caused by the rotation of the stirring heat absorption mechanism can be prevented from driving the smoke backflow, thereby effectively preventing the driving effect of the airflow on the smoke, reducing the risk of backflow, and improving work efficiency and stability. By setting the diameter of the smoke inlet pipe to be smaller than the diameter of the smoke outlet pipe, the residence time of the smoke can be increased when the smoke flows through the shell area, and the smoke stays in the shell area longer, so that the equipment stirring heat absorption mechanism and the waste heat recovery unit have more opportunities to exchange and absorb heat energy with the smoke, thereby effectively improving the heat energy recovery rate.

[0005] The purpose of this utility model can be achieved through the following technical solutions:

[0006] An energy transfer structure for recovering waste heat from flue gas of a boiler, comprising a waste heat recovery mechanism for flue gas, wherein the waste heat recovery mechanism for flue gas comprises a shell, and a stirring heat absorption mechanism is fixedly connected to the inside of the shell;

[0007] A duct fan is fixedly connected to an outer wall of one side of the shell near the bottom end, and a smoke inlet pipe is fixedly connected to an outer wall of one end of the duct fan.

[0008] Furthermore, a smoke outlet pipe is fixedly connected to an outer wall of one side of the shell near the top, and the diameter of the smoke outlet pipe is smaller than the diameter of the smoke inlet pipe.

[0009] Furthermore, a baffle is fixedly connected to the inner wall of the shell near the position of the pipeline fan.

[0010] Furthermore, the inner bottom wall of the shell is conical, and a drain pipe is fixedly connected to the bottom end of the shell near the center.

[0011] Furthermore, a waste heat recovery unit is fixedly connected near the top position inside the shell, and the waste heat recovery unit includes a plurality of heat exchange tubes 1. A circular tube 3 is fixedly connected between the outer walls of two adjacent heat exchange tubes 1 near the two ends, one of the outer walls of the heat exchange tubes 1 is fixedly connected to the outer wall of the shell, and the outer walls at both ends are located outside the shell and are respectively fixedly connected with a water inlet pipe and a water outlet pipe 2.

[0012] Furthermore, the stirring heat absorption mechanism includes a round rod, a motor and a plurality of heat exchange tubes 2, the outer wall of the round rod is rotatably connected to the outer wall of the shell, circular grooves are provided on the outer walls at both ends of the round rod, a water outlet pipe 1 is fixedly connected to the outer wall of one end of the round rod, a spur gear 1 is sleeved and fixedly connected to the outer wall of the one end of the round rod, a protective shell is fixedly connected to the outer wall of the shell at a place of the spur gear, the outer wall of the motor is fixedly connected to the inner wall of the protective shell, the outer wall of the motor shaft of the motor is sleeved and fixedly connected to a spur gear 2, and the outer wall of the spur gear 2 is meshed and transmitted with the outer wall of the spur gear 1.

[0013] Preferably: the outer wall of the round rod is located at the circular groove and is fixedly connected with four round tubes 1 at equal angles around its axis, and a round tube 2 is fixedly connected between the outer walls of two adjacent heat exchange tubes 2 near the two ends, one of the outer walls of the heat exchange tube 2 is fixedly connected to the outer wall of the round tube 1, and the outer wall of one end of the round rod is rotatably connected with a rotary joint, and the outer wall of the rotary joint is fixedly connected to the outer wall of the shell.

[0014] Beneficial effects of this utility:

[0015] 1. A stirring heat absorbing mechanism is fixedly connected inside the shell, a duct fan is fixedly connected to the outer wall of one side of the shell near the bottom, and a smoke inlet pipe is fixedly connected to the outer wall of one end of the duct fan. By arranging the duct fan at the smoke inlet pipe, the fluidity of the smoke can be increased, and at the same time, the airflow caused by the rotation of the stirring heat absorbing mechanism can be prevented to drive the smoke backflow, effectively preventing the driving effect of the airflow on the smoke, reducing the risk of backflow, and improving work efficiency and stability.

[0016] 2. A smoke outlet pipe is fixedly connected to the outer wall of one side of the shell near the top position. The diameter of the smoke outlet pipe is smaller than that of the smoke inlet pipe. By setting the diameter of the smoke inlet pipe smaller than that of the smoke outlet pipe, the residence time of the smoke can be increased when the smoke flows through the shell area. The smoke stays in the shell area longer, so that the equipment's stirring heat absorption mechanism and waste heat recovery unit have more opportunities to exchange and absorb heat energy with the smoke, thereby effectively improving the heat energy recovery rate.

[0017] 3. A baffle is fixedly connected to the inner wall of the shell near the position of the duct fan. By adding a baffle near the position of the duct fan inside the shell, the condensed water thrown out during the movement of the stirring heat absorption mechanism can be effectively prevented from entering the duct fan and the smoke inlet pipe, and prevented from flowing out along the pipe. This adjustment can significantly improve the working stability of the mechanism and ensure the normal operation of the flue gas waste heat recovery mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention is further described below in conjunction with the accompanying drawings.

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

[0020] Figure 2 It is a schematic diagram of the partial structure inside the shell of the utility model;

[0021] Figure 3 This is a schematic diagram of the internal structure of the flue gas waste heat recovery mechanism in the utility model;

[0022] Figure 4 It is a schematic diagram of the cross-sectional structure of the stirring heat absorption mechanism in the utility model;

[0023] Figure 5 It is a schematic diagram of the structure of the waste heat full recovery unit in the utility model.

[0024] In the figure: 100, flue gas waste heat recovery mechanism; 110, shell; 111, duct fan; 112, smoke inlet pipe; 113, smoke outlet pipe; 114, drain pipe; 115, protective shell; 116, baffle; 120, waste heat recovery unit; 121, heat exchange tube 1; 122, round tube 3; 123, water inlet pipe; 124, water outlet pipe 2; 200, stirring heat absorption mechanism; 210, round rod; 211, round groove; 212, spur gear 1; 213, water outlet pipe 1; 214, round tube 1; 220, motor; 221, spur gear 2; 230, heat exchange tube 2; 231, round tube 2; 240, rotary joint. DETAILED DESCRIPTION

[0025] The following will be combined with the practical embodiment to clearly and completely describe the technical solution in the practical embodiment. Obviously, the described embodiment is only a part of the practical embodiment, not all of the embodiments. Based on the embodiment in the practical, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this practical.

[0026] See also Figure 1-5In an embodiment of the utility model, an energy transfer structure for recovering waste heat from boiler flue gas includes a flue gas waste heat recovery mechanism 100, which includes a shell 110. A stirring heat absorption mechanism 200 is fixedly connected to the inside of the shell 110. A pipeline fan 111 is fixedly connected to an outer wall of one side of the shell 110 near the bottom end. A smoke inlet pipe 112 is fixedly connected to an outer wall of one end of the pipeline fan 111. A smoke outlet pipe 113 is fixedly connected to an outer wall of one side of the shell 110 near the top end. The diameter of the smoke outlet pipe 113 is smaller than the diameter of the smoke inlet pipe 112. A baffle 116 is fixedly connected to the inner wall of the shell 110 near the position of the pipeline fan 111.

[0027] The inner bottom wall of the shell 110 is conical, and a drain pipe 114 is fixedly connected to the bottom of the shell 110 near the center position, and a waste heat recovery unit 120 is fixedly connected to the inner side of the shell 110 near the top position. The waste heat recovery unit 120 includes a plurality of heat exchange tubes 121, and a circular tube 3 122 is fixedly connected to the outer walls of two adjacent heat exchange tubes 121 near both ends. The outer wall of one heat exchange tube 121 is fixedly connected to the outer wall of the shell 110, and the outer walls at both ends are located outside the shell 110 and are respectively fixedly connected to an inlet pipe 123 and an outlet pipe 124. The stirring heat absorption mechanism 200 includes a round rod 210, a motor 220 and a plurality of heat exchange tubes 230. The outer wall of the round rod 210 is rotatably connected to the outer wall of the shell 110, and circular grooves 211 are provided on the outer walls at both ends of the round rod 210. The outer wall of one end of the round rod 210 is fixed. A water outlet pipe 213 is connected, a spur gear 212 is sleeved and fixedly connected to the outer wall of one end of the round rod 210, a protective shell 115 is fixedly connected to the outer wall of the shell 110 at the spur gear 212, an outer wall of the motor 220 is fixedly connected to the inner wall of the protective shell 115, a spur gear 221 is sleeved and fixedly connected to the outer wall of the motor shaft of the motor 220, and the outer wall of the spur gear 221 is meshed with the outer wall of the spur gear 212 for transmission, the outer wall of the round rod 210 is located at the circular groove 211 and four round tubes 214 are fixedly connected around its axis at equal angles, and round tubes 231 are fixedly connected between the outer walls of two adjacent heat exchange tubes 230 near both ends, and the outer wall of one of the heat exchange tubes 230 is fixedly connected to the outer wall of the round tube 214, and a rotary joint 240 is rotatably connected to the outer wall of the round rod 210, and the outer wall of the rotary joint 240 is fixedly connected to the outer wall of the shell 110.

[0028] Specifically, during operation, smoke enters the smoke inlet pipe 112, and the duct fan 111 drives to accelerate the flow of smoke into the housing 110. Water quickly enters the circular groove 211 at one end of the round rod 210 or the heat exchange tube 1 121 from the rotary joint 240 or the water inlet pipe 123. The water in the circular groove 211 at one end of the round rod 210 flows along the circular tube 1 214 and the circular tube 231 into the heat exchange tube 2 230. The motor 220 drives the spur gear 221 to rotate, drives the spur gear 1 212 to rotate, and drives the stirring heat absorption mechanism 200 to rotate, so that the heat exchange tube 230 is fully connected with the heat exchange tube 230 in the housing 110. The flue gas contacts with the heat exchange tube 121 to accelerate the heat absorption efficiency. The flue gas after absorbing heat is absorbed again by the waste heat recovery unit 120, so that the heat energy is fully recovered. The distance between two adjacent heat exchange tubes 121 is short, so that the flue gas can fully contact with the heat exchange tube 121. The treated flue gas is discharged along the smoke outlet pipe 113, and the water after absorbing heat in the heat exchange tube 230 or the heat exchange tube 121 is discharged along the water outlet pipe 1 213 or the water outlet pipe 2 124. The condensed water generated in the shell 110 during the heat exchange process will be discharged from the drain pipe 114 along the conical bottom wall inside the shell 110.

[0029] Embodiment 1

[0030] like Figure 1 and 4 As shown, in this embodiment, the stirring heat absorption mechanism 200 includes a round rod 210, a motor 220 and a plurality of heat exchange tubes 230. The outer wall of the round rod 210 is rotatably connected to the outer wall of the shell 110. Circular grooves 211 are provided on the outer walls at both ends of the round rod 210. The outer wall of one end of the round rod 210 is fixedly connected to a water outlet pipe 213. The outer wall of one end of the round rod 210 is sleeved and fixedly connected to a spur gear 212. The outer wall of the shell 110 is fixedly connected to a protective shell 115 at the spur gear 212. The outer wall of the motor 220 is fixedly connected to the inner wall of the protective shell 115. The outer wall of the motor shaft of the motor 220 is sleeved and fixedly connected to a spur gear 221. The outer wall of the spur gear 221 is meshed and driven with the outer wall of the spur gear 212.

[0031] In this embodiment, according to work needs, the motor 220 drives the spur gear 221 to rotate, drives the spur gear 1 212 to rotate, and drives the stirring heat absorption mechanism 200 to rotate, so that the heat exchange tube 230 is fully in contact with the flue gas in the shell 110, accelerates the heat absorption efficiency, and thus realizes efficient energy conversion.

[0032] like Figure 3-4As shown, in this embodiment, the outer wall of the round rod 210 is located at the circular groove 211 and is fixedly connected with four circular tubes 214 at equal angles around its axis, and a circular tube 231 is fixedly connected between the outer walls of two adjacent heat exchange tubes 230 near both ends, wherein the outer wall of one heat exchange tube 230 is fixedly connected to the outer wall of the circular tube 1 214, and the outer wall of one end of the round rod 210 is rotatably connected with a rotary joint 240, and the outer wall of the rotary joint 240 is fixedly connected to the outer wall of the shell 110.

[0033] In specific implementation, water flows from the rotary joint 240 into one of the circular grooves 211 in the rotating round rod 210, and quickly flows along the circular tube 1 214 into the circular tube 2 231 and the heat exchange tube 2 230, and is discharged from the other circular groove 211 along the water outlet pipe 1 213 after absorbing heat.

[0034] Embodiment 2

[0035] like Figure 3 and 5 As shown, in this embodiment, a waste heat recovery unit 120 is fixedly connected near the top position inside the shell 110, and the waste heat recovery unit 120 includes a plurality of heat exchange tubes 121, and a circular tube 3 122 is fixedly connected between the outer walls of two adjacent heat exchange tubes 121 near the two ends, wherein the outer wall of one heat exchange tube 121 is fixedly connected to the outer wall of the shell 110, and the outer walls at both ends are located outside the shell 110 and are respectively fixedly connected with a water inlet pipe 123 and a water outlet pipe 124.

[0036] During specific implementation, water flows from the water inlet pipe 123 into one of the heat exchange tubes 121, and then flows into multiple heat exchange tubes 121 along the circular tube 3 122. The flue gas is absorbed again by the waste heat recovery unit 120, so that the heat energy is fully recovered. The distance between two adjacent heat exchange tubes 121 is short, so that the flue gas can fully contact the surface of the heat exchange tube 121, and the water after absorbing heat is discharged from the water outlet pipe 2 124.

[0037] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific characteristic structure materials or features described in conjunction with the embodiment or example are included in at least one embodiment or example of the present utility. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific characteristic structure materials or features described can be combined in any one or more embodiments or examples in a suitable manner.

[0038] The above contents are merely examples and explanations of the present invention. The technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the utility or exceed the scope defined in the claims, they should all fall within the protection scope of the present invention.

Claims

1. An energy transfer structure for recovering waste heat from boiler flue gas, characterized in that: It includes a flue gas waste heat recovery mechanism, which includes a shell, and a stirring heat absorption mechanism is fixedly connected inside the shell; A duct fan is fixedly connected to an outer wall of one side of the shell near the bottom end, and a smoke inlet pipe is fixedly connected to an outer wall of one end of the duct fan.

2. The energy transfer structure for recovering waste heat from boiler flue gas according to claim 1 is characterized in that: A smoke outlet pipe is fixedly connected to the outer wall of one side of the shell near the top position, and the diameter of the smoke outlet pipe is smaller than the diameter of the smoke inlet pipe.

3. The energy transfer structure for recovering waste heat from boiler flue gas according to claim 1 is characterized in that: A baffle is fixedly connected to the inner wall of the shell near the position of the pipeline fan.

4. The energy transfer structure for recovering waste heat from boiler flue gas according to claim 1 is characterized in that: The inner bottom wall of the shell is conical, and a drainage pipe is fixedly connected to the bottom end of the shell near the center.

5. The energy transfer structure for recovering waste heat from boiler flue gas according to claim 1 is characterized in that: A waste heat recovery unit is fixedly connected near the top position inside the shell, and the waste heat recovery unit includes a plurality of heat exchange tubes 1. A circular tube 3 is fixedly connected between the outer walls of two adjacent heat exchange tubes 1 near the two ends, one of the outer walls of the heat exchange tubes 1 is fixedly connected to the outer wall of the shell, and the outer walls at both ends are located outside the shell and are respectively fixedly connected with a water inlet pipe and a water outlet pipe 2.

6. The energy transfer structure for recovering waste heat from boiler flue gas according to claim 1, characterized in that: The stirring heat absorption mechanism includes a round rod, a motor and a plurality of heat exchange tubes 2. The outer wall of the round rod is rotatably connected with the outer wall of the shell. Circular grooves are provided on the outer walls at both ends of the round rod. The outer wall of one end of the round rod is fixedly connected with a water outlet pipe 1. The outer wall of one end of the round rod is sleeved and fixedly connected with a spur gear 1. The outer wall of the shell is fixedly connected with a protective shell at a place of the spur gear. The outer wall of the motor is fixedly connected with the inner wall of the protective shell. The outer wall of the motor shaft of the motor is sleeved and fixedly connected with a spur gear 2. The outer wall of the spur gear 2 is meshed and driven with the outer wall of the spur gear 1.

7. The energy transfer structure for recovering waste heat from boiler flue gas according to claim 6, characterized in that: The outer wall of the round rod is located at the circular groove and is fixedly connected with four round tubes 1 at equal angles around its axis. A round tube 2 is fixedly connected between the outer walls of two adjacent heat exchange tubes 2 near both ends. The outer wall of one of the heat exchange tubes 2 is fixedly connected to the outer wall of round tube 1. The outer wall of one end of the round rod is rotatably connected with a rotary joint, and the outer wall of the rotary joint is fixedly connected to the outer wall of the shell.

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