Carbon emission monitoring device for thermal power plant

Abstract

The utility model discloses a carbon emission monitoring device for a thermal power plant, which comprises a collection pipe, a first end of which is used for being inserted into a flue to be detected; the heating assembly is arranged on the periphery of the second end of the collecting pipe; the filter is arranged in the collecting tube; and the gas analysis unit is connected with the second end of the collecting pipe and can detect the CO2 concentration of the gas collected by the collecting pipe. According to the utility model, the CO2 content in the gas can be detected in a severe environment.

Description

Technical Field

[0001] This utility model relates to the field of carbon dioxide detection technology, specifically to a carbon emission monitoring device for thermal power plants. Background Technology

[0002] Currently, carbon emission monitoring in thermal power plants mainly employs two methods: the accounting method and the online monitoring method. The accounting method estimates carbon emissions by calculating data such as coal consumption and fuel characteristics, offering advantages such as wide applicability and standardized calculations. The online monitoring method uses equipment installed at the emission source to monitor flue gas concentration and flow rate in real time to obtain the total carbon emissions, characterized by good timeliness and high automation. Regarding CO2 concentration monitoring technologies, common methods include non-dispersive infrared absorption spectroscopy (NDIR), Fourier transform infrared absorption spectroscopy (FTIR), and tunable laser absorption spectroscopy (TDLAS). NDIR technology is mature and relatively inexpensive, but it is susceptible to interference from moisture and other gases; FTIR can simultaneously measure multiple gases, but preprocessing is complex and costly; TDLAS offers high accuracy and selectivity, but requires temperature and pressure compensation and is relatively expensive.

[0003] NDIR is susceptible to interference from moisture and background gases, while FTIR preprocessing is complex and has a long response time. The measurement principle of NDIR is sensitive to ambient humidity, and FTIR requires complex spectral analysis and calibration. How to reduce the sensitivity to environmental interference from CO2 and improve data quality and reliability is one of the important problems that urgently need to be solved in this field. Utility Model Content

[0004] The purpose of this invention is to provide a carbon emission monitoring device for thermal power plants to address the shortcomings of existing technologies and enable the detection of CO2 content in gases under harsh environments.

[0005] This utility model provides a carbon emission monitoring device for a thermal power plant, comprising:

[0006] The first end of the collection tube is used to insert into the flue to be tested;

[0007] A heating element is disposed on the outer periphery of the second end of the collection tube;

[0008] A filter is installed inside the collection tube;

[0009] The gas analysis unit, connected to the second end of the collection tube, is capable of detecting the CO2 concentration of the gas collected by the collection tube.

[0010] The carbon emission monitoring device for thermal power plants described above may optionally include a dryer for removing moisture from the gas.

[0011] In the carbon emission monitoring device for thermal power plants described above, optionally, the drying unit is located between the second end of the collection tube and the gas analysis unit or inside the collection tube.

[0012] In the carbon emission monitoring device for thermal power plants described above, optionally, a first mixing module is provided inside the collection tube for premixing the gas inside the collection tube.

[0013] In the carbon emission monitoring device for thermal power plants described above, optionally, the gas analysis unit is further provided with a second mixing module for further mixing the gas.

[0014] In the carbon emission monitoring device for thermal power plants described above, optionally, the gas analysis unit further includes a gas detection and analysis module for detecting gas concentration and a data transmission module for outputting the gas detection and analysis results to a host computer or server.

[0015] The carbon emission monitoring device for thermal power plants described above may optionally include a first housing and a second housing, wherein the first housing and the second housing are integrally formed; the second end of the collection tube, the heating component and the filter are all located inside the first housing, and the gas analysis unit is located inside the second housing.

[0016] In the carbon emission monitoring device for thermal power plants described above, optionally, both the first housing and the second housing are fixed to the outer wall of the flue to be tested.

[0017] In the carbon emission monitoring device for thermal power plants described above, optionally, the second housing is located at the bottom of the first housing.

[0018] In the carbon emission monitoring device for thermal power plants described above, optionally, the collection pipe is sealed to the side wall of the flue.

[0019] Compared to existing technologies, this invention directly connects the gas analysis unit to the second end of the sampling tube, eliminating the need for the sampling tube to travel through a long pipeline before reaching the gas analysis unit. This avoids errors caused by flue gas extraction and ensures data accuracy. Adding a filter prevents particulate impurities in the flue gas from entering the gas analysis unit, preventing blockage or damage to subsequent components. The heating element heats the portion of the sampling tube located outside the flue, maintaining its temperature and preventing gas condensation on the inner wall of the sampling tube, which could affect measurement results. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0021] Figure 2 yes Figure 1 The left view;

[0022] Figure 3 This is a schematic diagram of the structure of this utility model;

[0023] Figure 4 This is a schematic diagram of the gas analysis unit proposed in this utility model;

[0024] Figure 5 This is a flowchart of the steps involved in heat and humidity compensation.

[0025] Explanation of reference numerals in the attached figures:

[0026] 1-Collection tube, 2-Heating assembly, 3-Filter, 4-Gas analysis unit, 5-First mixing module, 6-Second mixing module, 7-First housing, 8-Second housing, 9-Dryer. Detailed Implementation

[0027] The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0028] Please refer to Figures 1 to 4 This embodiment proposes a carbon emission monitoring device for a thermal power plant, which includes a collection tube 1, a heating component 2, a filter 3, and a gas analysis unit 4. The collection tube 1 is used to collect gas in the flue and is made of corrosion-resistant and high-temperature-resistant materials. The gas analysis unit 4 adopts high-precision laser absorption spectroscopy technology, which can accurately measure the CO2 concentration. It uses a laser of a specific wavelength to detect the absorption characteristics of CO2 molecules and calculates the CO2 concentration in the flue gas by analyzing the laser absorption spectrum.

[0029] Specifically, the first end of the sampling tube 1 is used to insert into the flue to be tested. During installation, the sampling tube 1 should be sealed to the side wall of the flue.

[0030] The heating component 2 is disposed on the outer periphery of the second end of the collection tube 1; specifically, the portion of the collection tube 1 located outside the flue should be covered by the heating component 2. By setting the heating component 2, the collection tube 1 can be kept at a certain temperature to prevent moisture condensation from occurring on the inner wall of the collection tube 1 after the gas being tested enters it, thus affecting the measurement results. In specific implementation, the outer side of the heating component 2 can be wrapped with a layer of insulation material to reduce heat loss and ensure the temperature stability of the gas during transmission.

[0031] Filter 3 is installed inside the collection pipe 1; the function of filter 3 is to filter out large particulate impurities in the flue gas and prevent clogging and damage to subsequent components. Specifically, filter 3 can be a filter screen.

[0032] Gas analysis unit 4 is connected to the second end of the collection tube 1 and can detect the CO2 concentration of the gas collected by the collection tube 1. The function of gas analysis unit 4 is to detect the absorption characteristics of CO2 molecules using a laser of a specific wavelength, and to calculate the CO2 concentration in the flue gas by analyzing the laser absorption spectrum. That is, detection is performed using a tunable laser absorption spectrum method. This is prior art to those skilled in the art and can be implemented by them, so it will not be described in detail here.

[0033] In practical implementation, to further remove minute particles and moisture from the gas and improve measurement accuracy, this embodiment also includes a dryer 9 for removing moisture from the gas. Specifically, the dryer 9 can be disposed inside the collection tube 1 or between the second end of the collection tube 1 and the gas analysis unit 4. The key is to ensure that drying is completed before the gas enters the gas analysis unit 4.

[0034] In some implementations, the collection tube 1 is further provided with a first mixing module 5 for premixing the gas in the collection tube 1. Specifically, the first mixing module 5 can be a guide plate or a rotating component, as long as it can mix the gas before it enters the gas analysis unit 4.

[0035] In actual testing, the more uniform the gas mixing, the more accurate the test results. To further ensure uniform gas mixing, the gas analysis unit 4 is also equipped with a second mixing module 6 for further mixing the gas. In specific implementations, the second mixing module 6 can also be a guide plate or a rotating component, as long as it can remix the gas in the gas analysis unit 4 after it enters the unit.

[0036] In practical implementation, the gas analysis unit 4 further includes a gas detection and analysis module for detecting gas concentration and a data transmission module for outputting the gas detection and analysis results to a host computer or server. In practical implementation, the data transmission module acquires the detection results from the gas detection and analysis module, processes and transmits them in real time. This module is equipped with a high-performance embedded processor and wireless transmission equipment, enabling real-time transmission of monitoring data to the background monitoring system, achieving remote monitoring and analysis of the data. It also has data storage and fault alarm functions to ensure the stability and reliability of the monitoring process.

[0037] In some implementations, a first housing 7 and a second housing 8 are also included, with the first housing 7 and the second housing 8 integrally formed. The second end of the collection tube 1, the heating component 2, and the filter 3 are all located within the first housing 7, and the gas analysis unit 4 is located within the second housing 8. The first housing 7, the second housing 8, and the collection tube 1 are all made of high-temperature and corrosion-resistant materials. The entire device uses high-temperature and corrosion-resistant materials to ensure stable operation in harsh environments, while also providing convenient installation and maintenance, reducing operating costs, and offering an efficient and accurate solution for carbon emission monitoring in thermal power plants.

[0038] Both the first housing 7 and the second housing 8 are fixed to the outer wall of the flue to be tested. This allows for immediate analysis after gas collection, avoiding errors in the collected data due to transmission distance. It also effectively reduces the gas transmission path, preventing liquefaction due to cooling during transmission and ensuring measurement accuracy. The second housing is located at the bottom of the first housing. The collection tube is sealed to the side wall of the flue. In specific implementation, both the first housing 7 and the second housing 8 are sealed cavities, with a connecting hole between them. During sampling, a pump or other suction device is used to draw gas from the second housing 8. The gas to be tested enters the second housing 8 from the flue through the first housing 7. (The pump is not shown.)

[0039] In this embodiment, the gas analysis unit 4 employs TDLAS technology, which is significantly different from commonly used chemical analysis methods and Fourier transform infrared spectroscopy. TDLAS can suppress noise and avoid interference from other gas components. It can avoid interference from CO during monitoring, thus achieving accurate measurement even in environments with high CO concentrations. The technical features of gas analysis unit 4 are: the device is unaffected by the measurement of other gas components; by selecting near-infrared CO2 absorption lines, interference from CO and other gases can be avoided, making it suitable for complex monitoring environments with high CO concentrations and high humidity; it has a wide measurement range (0-30% (Vol), resolution of 0.01%), requires no calibration, and is easy to operate and maintain.

[0040] In some preferred implementations, to make the detection results more accurate, a temperature sensor and a humidity sensor can be added. Both the temperature sensor and the humidity sensor are connected to the gas analysis unit 4 so that high-precision detection results can be obtained through damp heat compensation.

[0041] Please refer to Figure 5 The temperature data collected by the temperature sensor and the humidity data collected by the humidity sensor are converted into absolute humidity (AH). The specific conversion can be performed using the following formula:

[0042]

[0043] Where T is the ambient temperature (°C) and RH is the relative humidity (%).

[0044] The measurement data are corrected according to the damp heat method compensation formula. The damp heat method compensation formula is as follows:

[0045] C corrected =C measured ×(1+k(AH-AH ref ));

[0046] Among them, C corrected For the corrected gas concentration, C measured The measured gas concentration is given by k, where k is the compensation coefficient and AH is the gas concentration. ref Using absolute humidity as a reference, a model is established to model the relationship between measurement error and the concentration of interfering gases based on the collected data. Linear regression or other fitting methods are typically used to obtain the relationship between error and the concentration of interfering gases. The compensation coefficient k is then calculated based on the fitted relationship. This coefficient reflects the degree of influence of changes in the concentration of interfering gases on the measurement results.

[0047] The carbon dioxide concentration value is calculated by fusing the corrected gas concentration data with the flue gas flow data.

[0048] It should be noted that in this embodiment, in order to facilitate the extraction of flue gas into the gas analysis unit 4, a pump can be used for extraction. This is prior art to those skilled in the art and can be implemented by them, so it will not be described in detail here.

[0049] This embodiment offers at least the following advantages: Employing TDLAS technology enables high-precision and high-sensitivity measurement of CO2 concentration, ensuring data accuracy. It achieves real-time carbon emission monitoring, providing immediate data to help companies adjust their emission strategies promptly and meet environmental requirements. It offers transparent and reliable data support, facilitating carbon emission management and enhancing corporate social responsibility. The damp-heat compensation design effectively solves the data drift problem of traditional monitoring technologies in high-temperature and high-humidity environments, ensuring data stability. The in-situ installation eliminates the need for a complex flue gas extraction system, reducing equipment complexity and maintenance costs. The device can operate stably in harsh environments such as high temperature, high humidity, and high corrosion, making it suitable for various complex industrial environments. Real-time monitoring and data correction ensure the accuracy and reliability of monitoring data, providing strong support for carbon emission management. It provides real-time data support, helping companies optimize carbon emission management strategies, reduce carbon emission costs, and improve economic efficiency.

[0050] The above description, based on the embodiments shown in the drawings, details the structure, features, and effects of this utility model. The above description is only a preferred embodiment of this utility model, but the scope of implementation of this utility model is not limited to what is shown in the drawings. Any changes made in accordance with the concept of this utility model, or modifications to equivalent embodiments, that do not exceed the spirit covered by the specification and drawings, shall be within the protection scope of this utility model.

Claims

1. A carbon emission monitoring device for thermal power plants, characterized in that: include, The first end of the collection tube (1) is used to be inserted into the flue to be tested; Heating component (2) is disposed on the outer periphery of the second end of the collection tube (1); A filter (3) is installed inside the collection tube (1); The gas analysis unit (4) is connected to the second end of the collection tube (1) and can detect the CO2 concentration of the gas collected by the collection tube (1).

2. The carbon emission monitoring device for thermal power plants according to claim 1, characterized in that: It also includes a dryer (9) for removing moisture from the gas.

3. The carbon emission monitoring device for thermal power plants according to claim 2, characterized in that: The drying device is located between the second end of the collection tube (1) and the gas analysis unit (4) or inside the collection tube (1).

4. The carbon emission monitoring device for thermal power plants according to claim 1, characterized in that: The collection tube (1) is also provided with a first mixing module (5) for premixing the gas in the collection tube (1).

5. The carbon emission monitoring device for thermal power plants according to claim 4, characterized in that: The gas analysis unit (4) is further provided with a second mixing module (6) for further mixing the gas.

6. The carbon emission monitoring device for thermal power plants according to claim 1, characterized in that: The gas analysis unit (4) also includes a gas detection and analysis module for detecting gas concentration and a data transmission module for outputting gas detection and analysis results to a host computer or server.

7. The carbon emission monitoring device for thermal power plants according to any one of claims 1-6, characterized in that: It also includes a first housing (7) and a second housing (8), the first housing (7) and the second housing (8) are integrally formed; the second end of the collection tube (1), the heating component (2) and the filter (3) are all located in the first housing (7), and the gas analysis unit (4) is located in the second housing (8).

8. The carbon emission monitoring device for thermal power plants according to claim 7, characterized in that: Both the first housing (7) and the second housing (8) are fixed to the outer wall of the flue to be tested.

9. The carbon emission monitoring device for thermal power plants according to claim 7, characterized in that: The second housing (8) is located at the bottom of the first housing (7).

10. The carbon emission monitoring device for thermal power plants according to any one of claims 1-6, characterized in that: The collection tube (1) is sealed to the side wall of the flue.

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