Boiler flue gas waste heat utilization device

Abstract

The utility model discloses a boiler flue gas waste heat utilization device, and relates to the technical field of flue gas waste heat utilization, the boiler flue gas waste heat utilization device comprises a bottom plate, the top of the bottom plate is fixedly connected with a heat exchange box, the upper part of the interior of the heat exchange box is fixedly connected with a first dispersion pipe, and the lower part of the interior of the heat exchange box is fixedly connected with a second dispersion pipe; a plurality of flue gas branch pipes are fixedly connected between the first dispersion pipe and the second dispersion pipe, a flue gas inlet pipe is fixedly connected to the front end of the first dispersion pipe, the front end of the flue gas inlet pipe penetrates through the front side wall of the heat exchange box and extends to the outer side of the heat exchange box, and a flue gas outlet pipe is fixedly connected to the front side of the second dispersion pipe; the front end of the smoke outlet pipe penetrates through the front side wall of the heat exchange box and extends to the outer side of the heat exchange box, and power generation assemblies are arranged on the upper surface of the bottom plate and the front end of the heat exchange box. The device has the advantages that heat energy in the flue gas can be utilized, energy cost is saved, kinetic energy generated when the flue gas flows can be utilized for power generation, and comprehensive utilization of resources is achieved.

Description

Technical Field

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

[0002] Boiler flue gas refers to a gas mixture composed of combustion products and emissions produced when a boiler burns fuel. In a boiler, fuel (such as coal, oil, natural gas, etc.) undergoes a combustion reaction under heated conditions, generating heat for heating water or producing steam, and also produces flue gas. Solid particles in boiler flue gas may be dust, coal ash, smoke, etc., which are products of fuel combustion or impurities in the fuel. In addition, boiler flue gas may also contain some organic matter, sulfur oxides, nitrogen oxides, etc. These substances have certain effects on the environment and health, so they need to be controlled and treated to reduce pollution to the environment.

[0003] For example, a boiler flue gas waste heat utilization device disclosed in Chinese patent (CN202320851460.X) includes a boiler body, a smoke exhaust pipe is provided on the upper part of the boiler body, a support platform is provided around the outer periphery of the smoke exhaust pipe, a water tank is installed on the support platform, and a water tank cover is provided on the smoke exhaust pipe. A water inlet pipe is provided on the left side of the water tank, and a water outlet pipe is provided on the right side of the water tank. At least four groups of serpentine heating tubes are evenly distributed in an array around the smoke exhaust pipe inside the water tank, and the plane formed by each group of serpentine heating tubes is perpendicular to the outer wall of the smoke exhaust pipe. A central tube extending out of the top of the water tank is provided in the center of the water tank above the smoke exhaust pipe outlet, the inlet end of each group of serpentine heating tubes is fixed on and connected to the smoke exhaust pipe, and the outlet end of each group of serpentine heating tubes is connected and connected to the lower port of the central tube. A thermometer is provided on the outer surface of the water tank, and the measuring probe of the thermometer extends into the water tank.

[0004] However, there are still problems. The serpentine pipe is used to exchange heat energy in the flue gas with cold water. The contact area of ​​the serpentine pipe is limited. The velocity and pressure distribution of the fluid in the serpentine pipe are uneven at different bends, which can easily lead to uneven flow of the fluid and reduce the efficiency of heat exchange. In addition, only the thermal energy of the flue gas is utilized, which can easily lead to low energy utilization. Utility Model Content

[0005] In order to solve the above technical problems, a boiler flue gas waste heat utilization device is provided, which solves the above-mentioned current use of serpentine pipes to exchange heat energy in the flue gas with cold water. The contact area of ​​the serpentine pipe is limited, and the velocity and pressure distribution of the fluid in the serpentine pipe at different bends are uneven, which can easily lead to uneven flow of the fluid and reduce the efficiency of heat exchange. In addition, only the thermal energy of the flue gas is utilized, which can easily lead to the problem of low energy utilization.

[0006] To achieve the above objectives, the technical solution adopted by the utility model is: a boiler flue gas waste heat utilization device, comprising a base plate, the upper top of the base plate is fixedly connected to a heat exchange box, the upper interior of the heat exchange box is fixedly connected to a first dispersion pipe, the lower interior of the heat exchange box is fixedly connected to a second dispersion pipe, a number of flue gas branch pipes are fixedly connected between the first dispersion pipe and the second dispersion pipe, the front end of the first dispersion pipe is fixedly connected to a flue gas inlet pipe, the front end of the flue gas inlet pipe passes through the front side wall of the heat exchange box and extends to the outside of the heat exchange box, the front side of the second dispersion pipe is fixedly connected to a flue gas outlet pipe, the front end of the flue gas outlet pipe passes through the front side wall of the heat exchange box and extends to the outside of the heat exchange box, a power generation component is arranged on the upper surface of the base plate and the front end of the heat exchange box, and the flue gas outlet pipe is connected to the power generation component.

[0007] Preferably, the power generation assembly includes a mounting pipe and a gear box, the mounting pipe is fixedly connected to the smoke outlet pipe via a connecting flange, and the gear box is fixedly connected to the upper surface of the base plate.

[0008] Preferably, a turbine blade is rotatably connected inside the mounting tube, a first transmission rod is rotatably connected to the left side of the gear box, and a left end of the first transmission rod passes through the right side wall of the mounting tube and is fixedly connected to the rotating shaft of the turbine blade.

[0009] Preferably, the output end of the gear box is fixedly connected to a second transmission rod, the right end of the second transmission rod is fixedly connected to a driving gear, and a generator is fixedly mounted on the upper surface of the base plate and the right side of the driving gear.

[0010] Preferably, the generator includes a mounting base fixedly connected to the top of the base plate, a shell fixedly connected to the top of the mounting base, a rotor core rotatably connected to the inside of the shell, a plurality of rotor poles fixedly connected to the inner wall of the shell, a driven gear fixedly connected to the left side of the rotor core via a rotating shaft, and the driven gear meshes with the driving gear.

[0011] Preferably, a cold water inlet pipe is fixedly connected to the right end of the rear bottom of the heat exchange box, and a hot water outlet pipe is fixedly connected to the left end of the rear bottom of the heat exchange box.

[0012] Preferably, shock-absorbing seats are fixedly connected at the four corners of the bottom of the base plate, and an inspection cover is fixedly connected to the top of the heat exchange box by bolts.

[0013] Compared with the prior art, the advantages of the utility model are:

[0014] 1. The utility model heats the cold water inside the heat exchange box by setting up multiple flue gas branches to exchange heat with the cold water inside the heat exchange box. Compared with the serpentine pipe, the contact area between the multiple flue gas branches and the cold water is larger. The heat energy in the flue gas is used for heating water treatment, which can make fuller use of energy and improve energy utilization efficiency. The hot water can also reduce the energy cost in the production process and is transported to the dormitory area through pipelines as living water for personnel or circulated through the pipeline system for heating.

[0015] 2. The utility model utilizes the kinetic energy of flue gas flow by arranging turbine blades, a first transmission rod, a gear box, a second transmission rod, a driving gear, a driven gear and a generator. By utilizing the kinetic energy of flue gas to generate electricity, comprehensive utilization of resources can be achieved. This method can not only reduce the impact of flue gas emissions on the environment, but also effectively utilize the energy resources in the exhaust gas.

[0016] 3. Using the kinetic energy of flue gas to generate electricity can bring economic benefits. It can be used by the factory to generate electricity, reducing production costs. It can also reduce the consumption of other energy sources and reduce energy costs, thereby improving the economic benefits of the enterprise. By using the kinetic energy in the exhaust gas to generate electricity, it is possible to achieve sustainable use of this resource and reduce dependence on other non-renewable energy sources. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;

[0018] Figure 2 It is a structural schematic diagram of the utility model from another perspective;

[0019] Figure 3 It is a schematic diagram of the internal structure of the heat exchange box in the utility model;

[0020] Figure 4 This is a schematic diagram of the structure of the power generation component in the utility model;

[0021] Figure 5 It is a schematic diagram of the internal structure of the generator in the utility model.

[0022] The numbers in the figure are: 1. bottom plate; 2. heat exchange box; 3. inspection cover; 4. flue gas inlet pipe; 5. first dispersion pipe; 6. flue gas branch pipe; 7. second dispersion pipe; 8. flue gas outlet pipe; 9. cold water inlet pipe; 10. hot water outlet pipe; 11. power generation component; 1101. mounting pipe; 1102. turbine blades; 1103. first transmission rod; 1104. gear box; 1105. second transmission rod; 1106. driving gear; 1107. driven gear; 1108. generator; 11081. mounting base; 11082. casing; 11083. rotor core; 11084. rotor pole; 12. shock absorber seat. DETAILED DESCRIPTION

[0023] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art may think of other obvious variations.

[0024] Reference Figure 1-5 As shown, a boiler flue gas waste heat utilization device comprises a bottom plate 1, a heat exchange box 2 is fixedly connected to the top of the bottom plate 1, a first dispersion pipe 5 is fixedly connected to the upper part of the heat exchange box 2, a second dispersion pipe 7 is fixedly connected to the lower part of the heat exchange box 2, a plurality of flue gas branch pipes 6 are fixedly connected between the first dispersion pipe 5 and the second dispersion pipe 7, a flue gas inlet pipe 4 is fixedly connected to the front end of the first dispersion pipe 5, the front end of the flue gas inlet pipe 4 passes through the front side wall of the heat exchange box 2 and extends to the outside of the heat exchange box 2, and a flue gas branch pipe 6 is fixedly connected to the front side of the second dispersion pipe 7. Gas outlet pipe 8, the front end of the smoke outlet pipe 8 passes through the front side wall of the heat exchange box 2 and extends to the outside of the heat exchange box 2, the upper surface of the bottom plate 1 and the front end of the heat exchange box 2 are provided with a power generation component 11, the smoke inlet pipe 4, the first dispersion pipe 5, the smoke branch pipe 6, the second dispersion pipe 7 and the smoke outlet pipe 8 are connected in sequence, and a filter is installed inside the smoke inlet pipe 4 to filter out solid particles in the smoke. By arranging multiple smoke branch pipes 6, the contact area with cold water is increased, thereby improving the efficiency of heat exchange, and the smoke outlet pipe 8 is connected to the power generation component 11.

[0025] Preferably, the power generation component 11 includes a mounting tube 1101 and a gear box 1104. The mounting tube 1101 is fixedly connected to the flue gas outlet pipe 8 via a connecting flange. The gear box 1104 is fixedly connected to the upper surface of the base plate 1. The gear box 1104 can improve the power generation efficiency by increasing the rotation speed, and by increasing the rotation speed, the size and weight of the required mechanical transmission elements can be reduced, thereby reducing the manufacturing cost.

[0026] Specifically, the installation tube 1101 is rotatably connected to the inside of the turbine blade 1102 , and the left side of the gear box 1104 is rotatably connected to the first transmission rod 1103 . The left end of the first transmission rod 1103 passes through the right side wall of the installation tube 1101 and is fixedly connected to the rotating shaft of the turbine blade 1102 .

[0027] It is worth noting that the output end of the gear box 1104 is fixedly connected to the second transmission rod 1105, the right end of the second transmission rod 1105 is fixedly connected to the driving gear 1106, and a generator 1108 is fixedly installed on the upper surface of the base plate 1 and the right side of the driving gear 1106. The generator 1108 uses the kinetic energy of the flue gas flow to generate electricity.

[0028] It is worth mentioning that the generator 1108 includes a mounting base 11081 fixedly connected to the top of the base plate 1, a shell 11082 fixedly connected to the top of the mounting base 11081, a rotor core 11083 rotatably connected inside the shell 11082, a plurality of rotor poles 11084 fixedly connected to the inner wall of the shell 11082, a driven gear 1107 fixedly connected to the left side of the rotor core 11083 through a rotating shaft, the driven gear 1107 is meshed with the driving gear 1106, a support seat is installed on the upper surface of the base plate 1 and below the second transmission rod 1105, the support seat is used to support the second transmission rod 1105 to ensure the stability of the second transmission rod 1105 during rotation.

[0029] Optionally, a cold water inlet pipe 9 is fixedly connected to the right end of the bottom rear side of the heat exchanger box 2, and a hot water outlet pipe 10 is fixedly connected to the left end of the bottom rear side of the heat exchanger box 2. Electromagnetic valves are installed on the cold water inlet pipe 9 and the hot water outlet pipe 10. The electric energy generated by the generator 1108 can be used to power the electromagnetic valves, and can also be used to power external equipment.

[0030] Specifically, shock-absorbing seats 12 are fixedly connected at the four corners of the bottom of the base plate 1, and an inspection cover 3 is fixedly connected to the top of the heat exchange box 2 by bolts. The shock-absorbing seats 12 perform shock-absorbing treatment when the device is running to ensure the stability and safety of the device during operation. The inspection cover 3 is fixed by bolts to facilitate the maintenance of the components inside the heat exchange box 2.

[0031] Working principle: When in use, first inject cold water into the heat exchange box 2 through the cold water inlet pipe 9. The flue gas generated by the boiler combustion is pressurized by the booster device and enters the first dispersion pipe 5 from the flue gas inlet pipe 4, and then dispersed into the flue gas branch pipe 6. The high-temperature flue gas completes heat exchange with the cold water in the heat exchange box 2 in the flue gas branch pipe 6, and heats the cold water inside the heat exchange box 2. The flue gas after heat exchange enters the second dispersion pipe 7 and then enters the installation pipe 1101 from the flue gas outlet pipe 8, and then drives the turbine blades 1102 to rotate. The turbine blades 1102 drive the gears inside the gear box 1104 to rotate through the first transmission rod 1103. After the speed is increased by the gear box 1104, the second transmission rod 1105 drives the driving gear 1106 to rotate, and the rotor core 11083 is rotated through the driven gear 1107 meshing therewith. When the rotor core 11083 rotates, it will cut the electromagnetic field of the rotor pole 11084, thereby achieving the effect of power generation.

[0032] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and the specification only describe the principles of the utility model. The utility model may be subject to various changes and improvements without departing from the spirit and scope of the utility model. These changes and improvements fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. A boiler flue gas waste heat utilization device, characterized in that: The invention comprises a bottom plate (1), the top of which is fixedly connected to a heat exchange box (2), a first dispersion pipe (5) is fixedly connected to the upper part of the interior of the heat exchange box (2), a second dispersion pipe (7) is fixedly connected to the lower part of the interior of the heat exchange box (2), a plurality of smoke branch pipes (6) are fixedly connected between the first dispersion pipe (5) and the second dispersion pipe (7), a smoke inlet pipe (4) is fixedly connected to the front end of the first dispersion pipe (5), the front end of the smoke inlet pipe (4) passes through the front side wall of the heat exchange box (2) and extends to the outside of the heat exchange box (2), a smoke outlet pipe (8) is fixedly connected to the front side of the second dispersion pipe (7), the front end of the smoke outlet pipe (8) passes through the front side wall of the heat exchange box (2) and extends to the outside of the heat exchange box (2), a power generation component (11) is arranged on the upper surface of the bottom plate (1) and the front end of the heat exchange box (2), and the smoke outlet pipe (8) is connected to the power generation component (11).

2. A boiler flue gas waste heat utilization device according to claim 1, characterized in that: The power generation assembly (11) comprises a mounting pipe (1101) and a gear box (1104); the mounting pipe (1101) is fixedly connected to the smoke outlet pipe (8) via a connecting flange; and the gear box (1104) is fixedly connected to the upper surface of the base plate (1).

3. A boiler flue gas waste heat utilization device according to claim 2, characterized in that: The installation tube (1101) is rotatably connected to a turbine blade (1102) inside, and the left side of the gear box (1104) is rotatably connected to a first transmission rod (1103), wherein the left end of the first transmission rod (1103) passes through the right side wall of the installation tube (1101) and is fixedly connected to the rotating shaft of the turbine blade (1102).

4. A boiler flue gas waste heat utilization device according to claim 2, characterized in that: The output end of the gear box (1104) is fixedly connected to a second transmission rod (1105), the right end of the second transmission rod (1105) is fixedly connected to a driving gear (1106), and a generator (1108) is fixedly installed on the upper surface of the base plate (1) and on the right side of the driving gear (1106).

5. A boiler flue gas waste heat utilization device according to claim 4, characterized in that: The generator (1108) comprises a mounting base (11081) fixedly connected to the top of the base plate (1), a housing (11082) fixedly connected to the top of the mounting base (11081), a rotor core (11083) rotatably connected inside the housing (11082), a plurality of rotor poles (11084) fixedly connected to the inner wall of the housing (11082), a driven gear (1107) fixedly connected to the left side of the rotor core (11083) via a rotating shaft, and the driven gear (1107) meshes with the driving gear (1106).

6. The boiler flue gas waste heat utilization device according to claim 1, characterized in that: A cold water inlet pipe (9) is fixedly connected to the right end of the bottom rear side of the heat exchange box (2), and a hot water outlet pipe (10) is fixedly connected to the left end of the bottom rear side of the heat exchange box (2).

7. The boiler flue gas waste heat utilization device according to claim 1, characterized in that: Shock-absorbing seats (12) are fixedly connected at the four corners of the bottom of the base plate (1), and an inspection cover (3) is fixedly connected to the top of the heat exchange box (2) by means of bolts.

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