Self-powered flue gas emission on-line monitoring device based on thermoelectric power generation

Abstract

The utility model discloses a self-powered flue gas emission on-line monitoring device based on thermoelectric power generation, which comprises a flue gas monitoring sensor arranged in a flue gas emission pipeline, the flue gas monitoring sensor is electrically connected with a signal acquisition unit, and the signal acquisition unit is electrically connected with a signal processing unit. The signal processing unit is connected with a flue gas emission monitoring background through the wireless communication unit, a base with heat conduction performance is tightly attached and fixed to the outer wall of the flue gas emission pipeline, the side, away from the flue gas emission pipeline, of the base is a plane, and a heat conduction end face of a thermoelectric power generation module is tightly attached and fixed to the plane. The thermoelectric power generation module is connected with the power supply management module, the power supply management module is respectively connected with the signal acquisition unit, the signal processing unit and the wireless communication unit, and the power supply management module is also connected with the battery; according to the device, the signal acquisition unit, the signal processing unit and the wireless communication unit are powered by thermoelectric power generation through the thermoelectric power generation module by using the temperature difference between the flue gas emission pipeline and the surrounding environment.

Description

Technical Field

[0001] The utility model relates to the field of electrolytic aluminum production, and in particular to a self-powered flue gas emission online monitoring device based on temperature difference power generation. Background Art

[0002] A large amount of flue gas is generated during the production process of aluminum electrolysis industry. The electrolytic flue gas contains harmful substances such as sulfide and hydrogen fluoride. The current common flue gas purification method is to mix a large amount of cold air to cool the high-temperature flue gas, and then use dry or wet purification. If the harmful substances in the flue gas enter the surrounding environment, it will cause environmental pollution and have toxic side effects on animal and plant organisms. Therefore, electrolytic aluminum plants generally require the installation of an online flue gas emission monitoring system to track whether the flue gas emission index data meets the emission requirements. At present, most flue gas emission monitoring systems are active devices, which require external power supplies or battery packs to power equipment such as flue gas sensors. This brings great difficulties to the deployment, installation and maintenance of the online monitoring system, and the stability and reliability of the system itself are relatively low. Utility Model Content

[0003] In view of this, the purpose of the utility model is to provide a self-powered online flue gas emission monitoring device based on temperature difference power generation, which is wiring-free, easy to install, maintenance-free and capable of achieving self-power.

[0004] The purpose of this utility model is achieved through the following technical solutions:

[0005] A self-sufficient online flue gas emission monitoring device based on temperature difference power generation, comprising a flue gas monitoring sensor arranged in a flue gas emission duct, the flue gas monitoring sensor is electrically connected to a signal acquisition unit, the signal acquisition unit is electrically connected to a signal processing unit, the signal processing unit is connected to a flue gas emission monitoring background via a wireless communication unit, a base with thermal conductivity is tightly fixed on the outer wall of the flue gas emission duct, the side of the base facing away from the flue gas emission duct is flat and a thermal conductive end face of a temperature difference power generation module is tightly fixed thereon, the temperature difference power generation module is connected to a power management module, the power management module is respectively connected to the signal acquisition unit, the signal processing unit and the wireless communication unit, and the power management module is also connected to a battery.

[0006] Furthermore, the temperature difference power generation module includes a heat conductive end surface, a heat collecting block, a thermoelectric conversion unit and a heat dissipation unit connected in sequence, and the whole formed by the base, the heat conductive end surface, the heat collecting block and the thermoelectric conversion unit is provided with a heat insulating layer in the circumference.

[0007] Furthermore, the flue gas monitoring sensor includes a CO2 sensor, a hydrogen fluoride sensor, a SO2 sensor, a PM2.5 sensor and a temperature and humidity sensor.

[0008] Furthermore, the smoke monitoring sensor is arranged on a probe rod, the probe rod is located in the inner radial direction of the smoke exhaust pipe and one end of the probe rod is vertically fixed to the wall of the smoke exhaust pipe near the base, and the probe rod is provided with a plurality of flow holes in the smoke flow direction.

[0009] Furthermore, the base is fixed to the smoke exhaust pipe by bolts or steel wire ropes.

[0010] Furthermore, the power management module, the signal acquisition unit, the signal processing unit and the wireless communication unit are integrated on a circuit board, and the circuit board is arranged in an electrical box, and a battery is also placed in the electrical box.

[0011] Furthermore, the electrical box is fixed on the heat dissipation unit.

[0012] The beneficial effects of the utility model are:

[0013] The utility model discloses a self-sufficient online flue gas emission monitoring device based on temperature difference power generation. The temperature difference power generation module utilizes the temperature difference between the flue gas emission pipeline and the surrounding environment to generate power for powering a signal acquisition unit, a signal processing unit and a wireless communication unit, or powers the signal acquisition unit, the signal processing unit and the wireless communication unit through a battery, thereby realizing real-time monitoring of flue gas emissions of an electrolytic aluminum plant, avoiding the arrangement of external power supply wires, facilitating installation and deployment, and easy maintenance, and having high reliability.

[0014] Other advantages, objectives and features of the present invention will be described in the following description to some extent, and will be apparent to those skilled in the art based on the following examination and research, or can be taught from the practice of the present invention to some extent. The objectives and other advantages of the present invention can be achieved and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model will be further described in detail below with reference to the accompanying drawings, in which:

[0016] Figure 1 This is the principle structure diagram of the utility model.

[0017] Figure 2 The figure is a schematic diagram of the arrangement of the temperature difference power generation module and the probe rod on the flue gas exhaust pipe of the utility model.

[0018] Figure 3 It is a top view of the temperature difference power generation module of the utility model.

[0019] In the figure: flue gas emission pipeline 1, flue gas monitoring sensor 2, signal acquisition unit 3, signal processing unit 4, wireless communication unit 5, base 6, temperature difference power generation module 7, heat conductive end surface 71, heat collecting block 72, thermoelectric conversion unit 73, heat dissipation unit 74, power management module 8, battery 9, thermal insulation layer 10, probe rod 11, flow hole 12, electrical box 13. DETAILED DESCRIPTION

[0020] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the preferred embodiments are only for illustrating the present invention, rather than for limiting the protection scope of the present invention.

[0021] like Figure 2 As shown, a self-sufficient flue gas emission online monitoring device based on temperature difference power generation includes a flue gas monitoring sensor 2. Specifically, the flue gas monitoring sensor 2 includes a CO2 sensor, a hydrogen fluoride sensor, a SO2 sensor, a PM2.5 sensor, a temperature and humidity sensor, etc. The flue gas monitoring sensor 2 is arranged on the surface of a probe rod 11. The probe rod 11 is located in the inner radial direction of the flue gas emission pipe 2 and one end thereof is vertically connected to the wall of the flue gas emission pipe. Specifically, the probe rod 11 is in the shape of a slender block. The probe rod 11 is provided with a plurality of flow holes 12 in the direction of flue gas flow. The plurality of flow holes 12 are evenly spaced along the length direction of the probe rod 11 to reduce the obstruction of the probe rod 11 to the flow of flue gas.

[0022] like Figure 1 As shown, the flue gas monitoring sensor 2 is electrically connected to the signal acquisition unit 3, the signal acquisition unit 3 is electrically connected to the signal processing unit 4, and the signal processing unit 4 is electrically connected to the flue gas monitoring background through the wireless communication unit 5; the signal acquisition unit 3 collects the signal generated by the flue gas monitoring sensor 2 and transmits the signal to the signal processing unit 4 for processing, and then transmits the signal to the flue gas monitoring background through the wireless communication unit 5 so that the monitoring personnel can know the flue gas emission index data in real time.

[0023] like Figure 2 and 3As shown, a base 6 with excellent thermal conductivity and toughness is fixed on the outer wall of the flue gas exhaust pipe 1 near the probe rod 11 by bolts or steel wire ropes. The base 6 is arc-shaped on the side facing the flue gas exhaust pipe 1 and is tightly fitted on the wall of the flue gas exhaust pipe. The side of the base 1 away from the flue gas exhaust pipe is flat and the heat-conducting end face 71 of the temperature difference power generation module 7 is tightly fitted thereon. The temperature difference power generation module 7 includes a heat-conducting end face 71, a heat collecting block 72, a thermoelectric conversion unit 73 and a heat dissipation unit 74 connected in sequence, wherein the hot end of the thermoelectric conversion unit 73 is connected to the heat collecting block 72, and the cold end is connected to the heat dissipation unit 74. The thermoelectric conversion unit 73 is The semiconductor device for temperature difference power generation is composed of semiconductor materials N-Bi2Te3, P-Bi2Te3 and ceramic sheets. The heat dissipation unit 74 dissipates heat naturally through air cooling. The heat-conducting end face 71 is fixed to the base 6 by bolts. The overall periphery formed by the base 6, the heat-conducting end face 71, the heat collecting block 72 and the thermoelectric conversion unit 73 is provided with a heat insulation layer 10. The base 6 conducts the heat of the flue gas exhaust pipe 2 to the heat-conducting end face 71, and the heat-conducting end face 71 conducts the heat to the heat collecting block 72. The heat dissipation unit 74 realizes effective heat dissipation, and a temperature difference is formed at the hot and cold ends of the thermoelectric conversion unit 73, thereby converting heat into electrical energy to achieve long-term and stable power generation.

[0024] In actual use, one or more groups of temperature difference power generation modules 7 can be selected according to the power supply load. During the daily production of electrolytic aluminum, the surface temperature of the flue gas duct is above 80°C, which can provide sufficient temperature difference for the thermoelectric conversion unit 73.

[0025] like Figure 1 As shown, the temperature difference power generation module 7 is connected to the power management module 8, and the power management module 8 is respectively connected to the signal acquisition unit 3, the signal processing unit 4 and the wireless communication unit 5. The power management module 8 is also connected to the battery 9, and the battery 9 operates in a "floating charge" form, preferably an industrial high-energy lithium battery that allows a high number of charge and discharge times, so that the temperature difference power generation module 7 directly supplies power to the signal acquisition unit 3, the signal processing unit 4 and the wireless communication unit 5, or the temperature difference power generation module 7 supplies power to the signal acquisition unit 3, the signal processing unit 4 and the wireless communication unit 5 through the battery 9.

[0026] The power management module 8 , the signal acquisition unit 3 , the signal processing unit 4 and the wireless communication unit 5 are integrated on a circuit board. The circuit board and the battery 9 are located in an electrical box 13 , and the electrical box 13 is fixed on the heat dissipation unit 74 of the temperature difference power generation module 7 .

[0027] The device utilizes the temperature difference between the flue gas emission duct 1 and the surrounding environment to generate electricity to power the signal acquisition unit 3, the signal processing unit 4 and the wireless communication unit 5 through the temperature difference power generation module 7, completely avoiding the layout of external power supply wires, facilitating installation and deployment and easy maintenance, having high reliability, providing a stable working power supply for the flue gas emission online monitoring device itself, and realizing real-time monitoring of the flue gas emission online monitoring device.

[0028] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution, which should be included in the scope of the claims of the utility model.

Claims

1. A self-powered flue gas emission online monitoring device based on temperature difference power generation, characterized in that: The invention comprises a flue gas monitoring sensor (2) arranged in a flue gas emission duct (1), the flue gas monitoring sensor (2) being electrically connected to a signal acquisition unit (3), the signal acquisition unit (3) being electrically connected to a signal processing unit (4), the signal processing unit (4) being connected to a flue gas emission monitoring background via a wireless communication unit (5), a base (6) having heat conductivity being tightly fitted and fixed on the outer wall of the flue gas emission duct (1), the side of the base (6) facing away from the flue gas emission duct (1) being a plane and having a heat conductive end surface (71) of a temperature difference power generation module (7) being tightly fitted and fixed thereon, the temperature difference power generation module (7) being connected to a power management module (8), the power management module being respectively connected to the signal acquisition unit (3), the signal processing unit (4) and the wireless communication unit (5), the power management module (8) being also connected to a battery (9).

2. According to claim 1, a self-sufficient flue gas emission online monitoring device based on temperature difference power generation is characterized in that: The temperature difference power generation module (7) comprises a heat-conducting end surface (71), a heat-collecting block (72), a thermoelectric conversion unit (73) and a heat-dissipating unit (74) connected in sequence, and a heat-insulating layer (10) is provided in the circumferential direction of the whole formed by the base (6), the heat-conducting end surface (71), the heat-collecting block (72) and the thermoelectric conversion unit (73).

3. The self-powered online flue gas emission monitoring device based on temperature difference power generation according to claim 1 is characterized in that: The flue gas monitoring sensor (2) comprises a CO2 sensor, a hydrogen fluoride sensor, a SO2 sensor, a PM2.5 sensor and a temperature and humidity sensor.

4. The self-powered online flue gas emission monitoring device based on temperature difference power generation according to claim 1 is characterized in that: The smoke monitoring sensor (2) is arranged on a probe rod (11), the probe rod (11) is located in the inner radial direction of the smoke exhaust pipe (1) and one end of the probe rod is vertically fixed to the wall of the smoke exhaust pipe near the base (6), and the probe rod (11) is provided with a plurality of flow holes (12) in the direction of smoke flow.

5. The self-powered online flue gas emission monitoring device based on temperature difference power generation according to claim 1 is characterized in that: The base (6) is fixed to the smoke exhaust pipe (1) by means of bolts or steel wire ropes.

6. The self-powered online flue gas emission monitoring device based on temperature difference power generation according to claim 2 is characterized in that: The power management module (8), the signal acquisition unit (3), the signal processing unit (4) and the wireless communication unit (5) are integrated on a circuit board. The circuit board is arranged in an electrical box (13). A battery (9) is also placed in the electrical box (13).

7. The self-powered online flue gas emission monitoring device based on temperature difference power generation according to claim 6 is characterized in that: The electrical box (13) is fixed on the heat dissipation unit (74).

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