A real-time carbon emission monitoring device for a thermal power plant

Abstract

The utility model discloses a kind of real-time carbon emission monitoring devices of thermal power plant, it relates to environmental protection monitoring technical field, the device includes flue, flue is equipped with branch pipe one, branch pipe two and branch pipe three in turn along flue gas flow direction, respectively connect ultrasonic flowmeter, temperature and pressure sensor and sampling tube;Sampling tube is double-layer structure and built-in heating wire, connect with filter box by venturi injector, filter box is equipped with three-stage filter layer, its outlet is connected in turn membrane separation dehumidification unit, gas outlet pipe with pressure balance unit, gas outlet pipe is connected with external gas analyzer.Simultaneously, real-time carbon emission is calculated in combination with flowmeter and temperature and pressure sensor data when working, flue gas is filtered, dehumidified, pressure stabilized and supplied analyzer detection, simultaneously, real-time carbon emission is calculated in combination with flowmeter and temperature and pressure sensor data.The device realizes homologous sampling and parameter monitoring, solves the problems, such as sampling blockage, insufficient pretreatment accuracy, large data deviation in prior art, and has high monitoring precision and strong stability, and is suitable for real-time monitoring of carbon emission of fixed pollution source of thermal power plant.

Description

Technical Field

[0001] This utility model relates to the field of environmental protection monitoring technology, specifically a real-time carbon emission monitoring device for thermal power plants. Background Technology

[0002] With the advancement of the "dual carbon" goals, the accurate monitoring of carbon emission data from thermal power plants, as major sources of carbon emissions, has become a core requirement for environmental regulation and corporate carbon management. Existing extraction-type carbon emission monitoring devices suffer from several technical challenges: First, sampling and parameter monitoring originate from different sources; flow rate, temperature, and pressure sensors are often located at different points in the flue, leading to poor data correlation and significant calculation errors. Second, sampling tubes are prone to blockage due to flue gas condensation and dust adhesion, affecting monitoring continuity, especially in high-humidity flue gas environments. Third, the pretreatment process is inadequate; traditional filtration and condensation dehumidification methods either lack sufficient filtration accuracy, causing wear on analyzer components, or result in carbon dioxide loss due to condensation, affecting concentration detection accuracy. Fourth, insufficient flue gas delivery power can easily lead to stagnation within the pipeline, reducing real-time performance. Fifth, pressure fluctuations affect detection stability; flue gas entering the analyzer without pressure stabilization often causes concentration measurement deviations due to changes in flow rate. These problems make it difficult for existing devices to meet the ±2% monitoring accuracy requirement, necessitating a real-time monitoring device that achieves simultaneous sampling, efficient anti-blocking, accurate pretreatment, and stable operation.

[0003] Therefore, those skilled in the art have provided a real-time carbon emission monitoring device for thermal power plants to solve the problems mentioned in the background art. Utility Model Content

[0004] The purpose of this invention is to provide a real-time carbon emission monitoring device for thermal power plants to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A real-time carbon emission monitoring device for a thermal power plant includes a horizontally arranged flue. Three branch pipes, designated as branch pipe one, branch pipe two, and branch pipe three, are welded sequentially along the flue gas flow direction. Branch pipe one is sealed with an ultrasonic flow meter via a flange, with its sensing end extending into the flue. Branch pipe two is sealed with a temperature and pressure sensor via a flange, with its sensing end at the same horizontal level as the ultrasonic flow meter's sensing end. Branch pipe three is sealed with a sampling tube via a flange, and the outlet end of the sampling tube is sealed with the side suction port of a Venturi injector via a flange. A filter box is fixedly connected to the outlet end of the Venturi injector via a flange.

[0007] As a further embodiment of this utility model: the filter box is provided with a coarse filter layer, a medium filter layer and a fine filter layer in sequence along the flue gas flow direction. The three filter materials are fixed by a slot and are tightly attached to the inner wall of the box. The front end of the filter box is detachably installed with a sealing cover by bolts, and a rubber sealing ring is embedded in the inner side of the sealing cover.

[0008] As a further embodiment of this utility model: the coarse filter layer is made of sintered metal mesh, the medium filter layer is made of activated carbon filter element, and the fine filter layer is made of PTFE filter membrane.

[0009] As a further embodiment of this utility model: the outlet end of the filter box is fixedly connected to a membrane separation dehumidification unit via a flange. The membrane separation dehumidification unit adopts a cylindrical shell and internally encapsulates a hydrophobic hollow fiber membrane module. Both ends of the module are fixed by epoxy resin potting. An electric heating sleeve is provided on the outside of the hollow fiber membrane module, and the electric heating sleeve is electrically connected to an external controller.

[0010] As a further improvement of this utility model: the outlet end of the membrane separation dehumidification unit is fixedly connected to an air outlet pipe, and the end of the air outlet pipe is fixedly connected to the air inlet of an external gas analyzer through a quick connector.

[0011] As a further improvement of this utility model: a pressure balancing unit is connected in series on the air outlet pipe, and the pressure balancing unit includes a pressure sensor welded to the pipe and an electromagnetic automatic regulating valve.

[0012] As a further improvement of this utility model: the outer wall of the sampling tube has a double-layer sleeve structure, with a heating wire spirally wound in the middle interlayer, and the outer wall of the sampling tube is wrapped with an aluminum silicate heat insulation layer, and the heat insulation layer is covered with a stainless steel protective layer.

[0013] As a further improvement of this utility model: the inlet end of the Venturi injector is connected to a clean air source pipe via a flange, and the other end of the clean air source pipe is fixedly connected to an external compressed air source via a ball valve, with a pressure gauge installed on the pipe.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] By installing three branch pipes at the same location in the flue, the consistency of flow rate, temperature, pressure, and sampling data is ensured, improving monitoring accuracy. The heating and insulation design of the sampling pipe and the power delivery of the Venturi injector effectively prevent flue gas condensation and pipe blockage. The three-layer filter material combination and membrane separation dehumidification technology of the filter box improve the flue gas pretreatment effect and reduce damage to the analyzer. The pressure balancing unit ensures the stability of gas detection. The overall device, through modular design and precise parameter control, realizes real-time and accurate monitoring of carbon emissions from thermal power plants, and is easy to install and maintain, adapting to complex flue conditions. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of a real-time carbon emission monitoring device for a thermal power plant.

[0017] Figure 2 This is a schematic diagram of the structure of a membrane separation dehumidification unit in a real-time carbon emission monitoring device for a thermal power plant.

[0018] Figure 3 This is a front view of a real-time carbon emission monitoring device for a thermal power plant.

[0019] Figure 4 This is a schematic diagram of the filter box in a real-time carbon emission monitoring device for a thermal power plant.

[0020] Figure 5 This is a schematic diagram of the sampling tube in a real-time carbon emission monitoring device for a thermal power plant.

[0021] Figure 6 This is a schematic diagram of the gas outlet pipe in a real-time carbon emission monitoring device for a thermal power plant.

[0022] In the diagram: 1. Flue; 2. Branch pipe 1; 3. Branch pipe 2; 4. Branch pipe 3; 5. Sampling pipe; 6. Heating wire; 7. Venturi injector; 8. Clean air source pipe; 9. Filter box; 10. Coarse filter layer; 11. Medium filter layer; 12. Fine filter layer; 13. Sealing cover; 14. Membrane separation dehumidification unit; 15. Air outlet pipe; 16. Pressure sensor; 17. Automatic regulating valve; 18. Ultrasonic flow meter; 19. Temperature and pressure sensor. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Example 1

[0025] Reference Figures 1-6This embodiment provides a real-time carbon emission monitoring device for a thermal power plant, including a horizontally arranged flue duct 1. Three branch pipes are welded sequentially along the flue gas flow direction in the flue duct 1. The three branch pipes are branch pipe 1 (2), branch pipe 2 (3), and branch pipe 3 (4). Branch pipe 1 (2) is sealed with an ultrasonic flow meter 18 via a flange, with its sensing end extending into the flue duct 1. Branch pipe 2 (3) is sealed with a temperature and pressure sensor 19 via a flange, with its sensing end at the same horizontal plane as the sensing end of the ultrasonic flow meter 18. Branch pipe 3 (4) is sealed with a sampling tube 5 via a flange. The outer wall of the sampling tube 5 has a double-layer sleeve structure, with a heating wire 6 spirally wound in the middle layer. The outer wall of the sampling tube 5 is wrapped with an aluminum silicate insulation layer, and the insulation layer is covered with a stainless steel protective layer. The outlet end of the sampling tube 5 is sealed to the side suction port of the Venturi injector 7 through a flange. The outlet end of the Venturi injector 7 is fixedly connected to a filter box 9 through a flange. The inlet end of the Venturi injector 7 is connected to a clean air source pipe 8 through a flange. The other end of the clean air source pipe 8 is fixedly connected to an external compressed air source through a ball valve. A pressure gauge is installed on the pipeline.

[0026] Example 2

[0027] Reference Figures 1-6 This embodiment is based on the previous embodiment, but differs from the previous embodiment in that the filter box 9 is provided with a coarse filter layer 10, a medium filter layer 11 and a fine filter layer 12 in sequence along the flue gas flow direction. The three filter materials are fixed by slots and are tightly attached to the inner wall of the box. The front end of the filter box 9 is detachably installed with a sealing cover 13 by bolts. A rubber sealing ring is embedded in the inner side of the sealing cover 13. The coarse filter layer 10 is made of sintered metal mesh, the medium filter layer 11 is made of activated carbon filter element, and the fine filter layer 12 is made of PTFE filter membrane.

[0028] Furthermore, the outlet end of the filter box 9 is fixedly connected to a membrane separation dehumidification unit 14 via a flange. The membrane separation dehumidification unit 14 adopts a cylindrical shell and encapsulates a hydrophobic hollow fiber membrane module inside. The two ends of the module are fixed by epoxy resin potting. An electric heating sleeve is provided on the outside of the hollow fiber membrane module, and the electric heating sleeve is electrically connected to an external controller.

[0029] Furthermore, an air outlet pipe 15 is fixedly connected to the outlet end of the membrane separation dehumidification unit 14. The end of the air outlet pipe 15 is fixedly connected to the air inlet of an external gas analyzer via a quick connector. A pressure balancing unit is connected in series on the air outlet pipe 15. The pressure balancing unit includes a pressure sensor 16 welded to the pipeline and an electromagnetic automatic regulating valve 17.

[0030] Working principle: When the device is running, during the flow of flue gas in flue 1, the ultrasonic flow meter 18 on branch pipe 1 2 monitors the flue gas flow rate in real time, and the temperature and pressure sensor 19 on branch pipe 2 3 synchronously collects the flue gas temperature and pressure on the same horizontal plane. Meanwhile, the sampling tube 5 connected to branch pipe 3 4 extracts flue gas samples from the central axis of flue 1. The sampling tube 5 is heated by the heating wire 6 in the double-layer sleeve structure and is combined with the heat insulation layer to prevent flue gas condensation. The Venturi injector 7 uses compressed air provided by the clean air source pipe 8 as power to send the flue gas into the filter box 9. The metal sintered mesh (coarse filter layer 10) and columnar activated carbon filter element (middle filter layer 10) in the filter box 9 are used to send the flue gas into the filter box 9. 1) The PTFE filter membrane (fine filter layer 12) sequentially removes dust and harmful impurities from the flue gas. After being sealed by the sealing cover 13 to ensure no leakage, the flue gas enters the membrane separation dehumidification unit 14. The hydrophobic hollow fiber membrane module removes moisture without losing carbon dioxide with the assistance of the electric heating jacket. The treated flue gas is delivered to the external gas analyzer through the outlet pipe 15. The pressure balancing unit composed of the pressure sensor 16 and the electromagnetic automatic regulating valve 17 on the outlet pipe 15 stabilizes the pressure within a suitable range. Finally, the carbon dioxide concentration detected by the gas analyzer is calculated together with the data from the flow meter and the temperature and pressure sensor 19 to obtain the real-time carbon emission.

[0031] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0032] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A real-time carbon emission monitoring device for a thermal power plant, characterized in that, The system includes a horizontally arranged flue (1), which has three branch pipes welded sequentially along the flue gas flow direction. The three branch pipes are branch pipe one (2), branch pipe two (3), and branch pipe three (4). Branch pipe one (2) is connected to an ultrasonic flow meter (18) via a flange seal, and its detection end extends into the flue (1). Branch pipe two (3) is connected to a temperature and pressure sensor (19) via a flange seal, and its sensing end is at the same horizontal plane as the detection end of the ultrasonic flow meter (18). Branch pipe three (4) is connected to a sampling tube (5) via a flange seal, and the outlet end of the sampling tube (5) is connected to the side suction port of the Venturi injector (7) via a flange seal. The outlet end of the Venturi injector (7) is fixedly connected to a filter box (9) via a flange.

2. The real-time carbon emission monitoring device for a thermal power plant according to claim 1, characterized in that, The filter box (9) is provided with a coarse filter layer (10), a medium filter layer (11) and a fine filter layer (12) in sequence along the flue gas flow direction. The three filter materials are fixed by the slot and are tightly attached to the inner wall of the box. The front end of the filter box (9) is detachably installed with a sealing cover (13) by bolts. A rubber sealing ring is embedded in the inner side of the sealing cover (13).

3. The real-time carbon emission monitoring device for a thermal power plant according to claim 2, characterized in that, The coarse filter layer (10) is made of sintered metal mesh, the medium filter layer (11) is made of activated carbon filter element, and the fine filter layer (12) is made of PTFE filter membrane.

4. The real-time carbon emission monitoring device for a thermal power plant according to claim 1, characterized in that, The outlet end of the filter box (9) is fixedly connected to a membrane separation dehumidification unit (14) via a flange. The membrane separation dehumidification unit (14) adopts a cylindrical shell and encapsulates a hydrophobic hollow fiber membrane module inside. The two ends of the module are fixed by epoxy resin potting. The hollow fiber membrane module is covered with an electric heating sleeve, and the electric heating sleeve is electrically connected to an external controller.

5. The real-time carbon emission monitoring device for a thermal power plant according to claim 4, characterized in that, The outlet end of the membrane separation dehumidification unit (14) is fixedly connected to an air outlet pipe (15), and the end of the air outlet pipe (15) is fixedly connected to the air inlet of an external gas analyzer through a quick connector.

6. The real-time carbon emission monitoring device for a thermal power plant according to claim 5, characterized in that, A pressure balancing unit is connected in series on the outlet pipe (15). The pressure balancing unit includes a pressure sensor (16) welded to the pipe and an electromagnetic automatic regulating valve (17).

7. The real-time carbon emission monitoring device for a thermal power plant according to claim 1, characterized in that, The outer wall of the sampling tube (5) is a double-layer sleeve structure, with a heating wire (6) spirally wound in the middle interlayer. The outer wall of the sampling tube (5) is wrapped with an aluminum silicate heat insulation layer, and the heat insulation layer is covered with a stainless steel protective layer.

8. The real-time carbon emission monitoring device for a thermal power plant according to claim 1, characterized in that, The inlet end of the Venturi injector (7) is connected to a clean air source pipe (8) via a flange. The other end of the clean air source pipe (8) is fixedly connected to an external compressed air source via a ball valve. A pressure gauge is installed on the pipe.

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