CN115753674A - Power plant flue gas carbon dioxide emission monitoring system with temperature compensation and operation method - Google Patents
Power plant flue gas carbon dioxide emission monitoring system with temperature compensation and operation method Download PDFInfo
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- CN115753674A CN115753674A CN202111027006.4A CN202111027006A CN115753674A CN 115753674 A CN115753674 A CN 115753674A CN 202111027006 A CN202111027006 A CN 202111027006A CN 115753674 A CN115753674 A CN 115753674A
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Abstract
The invention discloses a power plant flue gas carbon dioxide emission monitoring system with temperature compensation, which comprises a flue gas monitoring system, a data processing system and a carbon dioxide laser control measurement module, wherein the flue gas monitoring system is used for monitoring flue gas parameters, and the data processing system is used for processing data measured by the flue gas monitoring system and the carbon dioxide laser control measurement module; the carbon dioxide laser control measurement module comprises a laser controller, a laser collimator, a photoelectric detector and a data collector. The invention fully considers the influence of the flue gas temperature on the carbon dioxide concentration measurement and carries out corresponding temperature compensation, thereby improving the accuracy of the actual carbon dioxide concentration measurement. The temperature compensation function reduces the influence of the deviation of the calculation result on the carbon dioxide concentration measurement result when the absorbance integral value and the line intensity are calculated from the carbon dioxide absorption line.
Description
Technical Field
The invention belongs to the technical field of carbon emission monitoring, and particularly relates to a power plant flue gas carbon dioxide emission monitoring system with temperature compensation and an operation method.
Background
Global climate problems are more and more attracting high attention of people, and low carbon economy characterized by low energy consumption, low emission and low pollution becomes a hotspot of global political economy games. China's power supply mainly takes thermal power as a main factor, which also determines that the carbon dioxide emission of the power industry is large.
Recently, china continuously carries out new measures and new actions on the aspect of realizing the 30/60 double-carbon target. Formally online carbon emission trading market in 7 months 2021. The power generation industry is used as the first starting industry of a carbon emission right trading market, and enterprises which are listed as key emission units exceed 2000 families, so that higher requirements are provided for monitoring carbon dioxide emission of thermal power plants.
The carbon dioxide emission monitoring of coal-fired and gas-fired power plants mainly adopts an emission factor method, and the technology is mature and complete. However, coal-fired power plants in China generally have mixed combustion, and factors such as installed capacity, process technology, carbon content actual measurement conditions and the like also have great influence on an emission factor method, so that default values provided by the nation are difficult to be applied to all power plants, and the representativeness of the power plants is in constant debate. Currently, on-line monitoring technology (CEMS) is rapidly developing, and most power plants meet the requirements for CEMS provisioning. Therefore, it is necessary to provide an online carbon dioxide emission monitoring method to accurately measure the carbon dioxide emission and assist the healthy development of the carbon emission right trading market. Since the temperature of the flue gas of the power plant has a significant influence on the accuracy of the carbon dioxide concentration measurement, it is necessary to consider the correction of the measured carbon dioxide concentration by temperature compensation.
Disclosure of Invention
The invention aims to provide a power plant flue gas carbon dioxide emission monitoring system with temperature compensation and an operation method thereof, aiming at the technical problems that the installed capacity, the process technology and the actual measurement condition of carbon content have great influence on an emission factor method and the emission factor method is not suitable for all power plants in the prior art.
In order to achieve the purpose, the invention provides a power plant flue gas carbon dioxide emission monitoring system with temperature compensation, which comprises: the system comprises a flue gas monitoring system, a data processing system and a carbon dioxide laser control measurement module, wherein the flue gas monitoring system is used for monitoring flue gas parameters, and the data processing system is used for processing data measured by the flue gas monitoring system and the carbon dioxide laser control measurement module; the carbon dioxide laser control measurement module comprises a laser controller, a laser collimator, a photoelectric detector and a data collector, wherein the laser controller is used for controlling the temperature and the input current of the laser; the laser is arranged at the downstream of the laser controller and is used for emitting laser; the laser collimator is arranged at the downstream of the laser and is used for converting the laser into parallel light; the photoelectric detector is arranged at the downstream of the laser collimator and is used for converting the laser signal into a voltage signal or a current signal; the data acquisition card is arranged at the downstream of the photoelectric detector and is used for acquiring voltage signals or current signals.
The flue gas monitoring system and the carbon dioxide laser control measurement module can simultaneously monitor the concentration of carbon dioxide and the flow of flue gas on line, thereby realizing the purpose of monitoring the emission of carbon dioxide in flue gas on line in real time. The laser collimator of the invention changes the light emitted by the laser into parallel light, so that the beam passing through the smoke reaches the maximum energy density, and the detection sensitivity is improved. The laser controller of the invention realizes the fast tuning and wavelength modulation of the wavelength by changing the input current of the laser; the temperature of the laser is controlled to be within a set temperature range, so that the normal work of the laser is guaranteed.
Further, the flue gas parameters include flue gas temperature, flue gas pressure and flue gas flow.
Further, the parallel light is incident into the flue gas, and carbon dioxide in the flue gas selectively absorbs the parallel light.
Further, the laser is one of a fabry-perot laser, a distributed feedback semiconductor laser, a distributed bragg reflector laser, a vertical cavity surface emitting laser, or an external cavity tunable semiconductor laser.
Further, the data processing system calculates the carbon dioxide concentration in the actual flue gas after temperature compensation according to the measured carbon dioxide absorption spectral line based on the corresponding relation between the carbon dioxide concentration and the carbon dioxide absorption spectral line which are calibrated in advance.
The data processing system of the invention fully considers the influence of the flue gas temperature on the carbon dioxide concentration measurement, and carries out corresponding temperature compensation, thereby improving the accuracy of the actual carbon dioxide concentration measurement. The temperature compensation function reduces the influence of the deviation of the calculation result on the carbon dioxide concentration measurement result when the absorbance integral value and the line intensity are calculated from the carbon dioxide absorption line.
Further, the data processing system calculates the carbon dioxide emission according to the carbon dioxide concentration and the flue gas flow.
The invention also provides an operation method of the power plant flue gas carbon dioxide emission monitoring system with temperature compensation, which comprises the following steps:
(1) Selecting a proper monitoring point in a tail flue of the power plant, installing a flue gas monitoring system, and testing the temperature, pressure and flow of the flue gas;
(2) Starting a carbon dioxide laser control measurement module, controlling the temperature and input current of a laser by using a laser controller, emitting laser from the laser, converting the laser into parallel light after passing through a laser collimator, and injecting the parallel light into a flue;
(3) The carbon dioxide in the flue gas selectively absorbs the incident parallel light, and the carbon dioxide has different absorption intensities to the parallel light with different wavelengths and shows the form of a carbon dioxide absorption peak;
(4) Parallel light absorbed by carbon dioxide is incident to a photoelectric detector, and the photoelectric detector converts a laser light signal into a voltage signal or a current signal;
(5) The data acquisition card acquires a voltage signal or a current signal and transmits the voltage signal or the current signal to the data processing system;
(6) The data processing system calculates the integral value of the spectral absorption rate in the full-wave number domain according to the measured carbon dioxide absorption spectral line based on the corresponding relation between the flue gas with the carbon dioxide concentration calibrated in advance and the carbon dioxide absorption spectral line and the integral value of the spectral absorption rate in the full-wave number domain at different temperatures, and calculates the carbon dioxide concentration of the actual flue gas at the corresponding temperature after temperature compensation;
(7) And the data processing system calculates to obtain the real-time carbon dioxide emission in the flue gas of the power plant according to the calculated concentration of the carbon dioxide in the flue gas and the calculated flow rate of the flue gas, so that the real-time monitoring of the carbon dioxide emission in the flue gas is completed.
Further, the calculation formula of the carbon dioxide concentration is as follows: the formula I is as follows:
wherein X is the measured value of carbon dioxide concentration, A is the integral value of the absorptivity of the carbon dioxide absorption spectrum line, S (T) is the spectrum line intensity, P is the flue gas pressure, L is the optical path, and L is kept unchanged on a fixed device;
measuring the corresponding relation between the A/S (T) value and X at different temperatures, and performing linear fitting to obtain a formula II:
a/S (T) = cX + d, wherein c, d are linear fitting coefficients;
when the concentration of carbon dioxide in the flue gas is monitored, A and (T) are respectively calculated according to the absorption spectrum line of the carbon dioxide in the flue gas, and the A and (T) are substituted into a formula I to obtain X 0 X is to be 0 And substituting the formula II to obtain A/S (T) of temperature compensation, and substituting the A/S (T) to the formula I to obtain X of temperature compensation, wherein X is the actual concentration of the carbon dioxide.
Further, the formula for calculating the emission amount of carbon dioxide is as follows: q = X × V, where Q is an emission amount of carbon dioxide, X is a carbon dioxide concentration, and V is a flue gas flow rate.
The invention adopts a direct absorption method based on the tunable semiconductor laser absorption spectrum technology and carries out temperature compensation, thereby improving the measurement precision of the carbon dioxide concentration and reducing the relative error.
Compared with the prior art, the invention has the technical effects that: the power plant flue gas carbon dioxide emission monitoring system with the temperature compensation fully considers the influence of the flue gas temperature on the carbon dioxide concentration measurement, so that the temperature compensation is carried out, the measurement precision of the carbon dioxide concentration is improved, and the relative error is reduced; the flue gas monitoring system and the carbon dioxide laser control measurement module can simultaneously monitor the concentration of carbon dioxide and the flow of flue gas in the flue gas on line, further realize the purpose of monitoring the emission of carbon dioxide in the flue gas on line in real time, and guide the optimized operation of a power plant by combining the quota index of the carbon emission right of the power plant; the invention can also make full use of the existing flue gas monitoring points of the power plant, and reduce the cost for monitoring the emission of carbon dioxide.
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The foregoing and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic structural diagram of a power plant flue gas carbon dioxide emission monitoring system with temperature compensation according to the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are illustrative and intended to explain the present invention and should not be construed as limiting the present invention.
The following describes a power plant flue gas carbon dioxide emission monitoring system with temperature compensation and an operation method thereof according to an embodiment of the invention with reference to the accompanying drawings.
As shown in FIG. 1, the system for monitoring carbon dioxide emission from flue gas of power plant with temperature compensation comprises: the system comprises a flue gas monitoring system, a data processing system and a carbon dioxide laser control measurement module, wherein the flue gas monitoring system is used for monitoring flue gas parameters, and the data processing system is used for processing data measured by the flue gas monitoring system and the carbon dioxide laser control measurement module; the carbon dioxide laser control measurement module comprises a laser controller, a laser collimator, a photoelectric detector and a data collector, wherein the laser controller is used for controlling the temperature and the input current of the laser; the laser is arranged at the downstream of the laser controller and used for emitting laser; the laser collimator is arranged at the downstream of the laser and is used for converting the laser into parallel light; the photoelectric detector is arranged at the downstream of the laser collimator and is used for converting the laser signal into a voltage signal or a current signal; the data acquisition card is arranged at the downstream of the photoelectric detector and used for acquiring voltage signals or current signals.
The flue gas monitoring system is installed in a power plant flue and used for monitoring flue gas parameters in real time and transmitting the flue gas parameters to the data processing system. The flue gas parameters include flue gas temperature, flue gas pressure and flue gas flow. In addition, the flue gas refers to flue gas in a tail flue of a thermal power plant, and the thermal power plant comprises a coal-fired power plant, a gas-fired power plant, an IGCC power plant, a biomass power plant, a waste incineration power plant and the like.
The invention adopts a direct absorption method based on tunable semiconductor laser absorption spectrum Technology (TDLAS) to determine the carbon dioxide absorption spectrum line, namely, the carbon dioxide laser control measurement module is completed based on the TDLAS technology. The carbon dioxide laser control measurement module comprises a laser controller, a laser collimator, a photoelectric detector and a data acquisition unit. The laser controller is used for controlling the temperature and the input current of the laser, so that the temperature of the laser is controlled within a set temperature range to ensure the normal work of the laser. The laser is disposed downstream of the laser controller for emitting laser light. The laser comprises a Fabry-Perot laser, a distributed feedback semiconductor laser, a distributed Bragg reflection laser, a vertical cavity surface emitting laser and an external cavity tuning semiconductor laser, wherein the laser adopts the distributed feedback semiconductor laser, and the central wavelength is 1580nm. The laser collimator is arranged at the downstream of the laser and used for converting laser into parallel light, the parallel light is incident into flue gas, carbon dioxide in the flue gas selectively absorbs the parallel light, and the carbon dioxide has different absorption intensities on the parallel light with different wavelengths and presents the form of a carbon dioxide absorption peak. The photoelectric detector is arranged at the downstream of the laser collimator, parallel light absorbed by carbon dioxide is incident to the photoelectric detector, the photoelectric detector converts a laser signal into a voltage signal or a current signal, and the photoelectric detector has a high signal-to-noise ratio to the laser signal in a wavelength range of 1550-1600 nm. The data acquisition card is arranged at the downstream of the photoelectric detector and used for acquiring voltage signals or current signals and transmitting the voltage signals or the current signals to the data processing system, the data processing system converts the electric signals into absorption spectra firstly, and then the carbon dioxide concentration is calculated through the absorption spectra.
And the data processing system calculates the carbon dioxide concentration in the actual flue gas after carrying out temperature compensation according to the measured carbon dioxide absorption spectral line based on the corresponding relation between the carbon dioxide concentration and the carbon dioxide absorption spectral line calibrated in advance. And the data processing system calculates the carbon dioxide emission according to the carbon dioxide concentration and the flue gas flow.
The carbon dioxide concentration is calculated by the formula: the formula I is as follows:
wherein X is the measured value of carbon dioxide concentration, A is the integral value of the absorptivity of the carbon dioxide absorption spectrum line, S (T) is the spectrum line intensity, P is the flue gas pressure, L is the optical path, and L is kept unchanged on a fixed device;
measuring the corresponding relation between the A/S (T) value and X at different temperatures, and performing linear fitting to obtain a formula II:
a/S (T) = cX + d, wherein c, d are linear fitting coefficients;
when the concentration of carbon dioxide in the flue gas is monitored, A and (T) are respectively calculated according to the absorption spectrum line of the carbon dioxide in the flue gas, and the A and (T) are substituted into a formula I to obtain X 0 X is to be 0 And substituting the formula II to obtain A/S (T) of temperature compensation, and substituting the A/S (T) to the formula I to obtain X of temperature compensation, wherein X is the actual concentration of the carbon dioxide.
The formula for calculating the emission of carbon dioxide is as follows: q = X × V, where Q is an emission amount of carbon dioxide, X is a carbon dioxide concentration, and V is a flue gas flow rate.
The operation method of the power plant flue gas carbon dioxide emission monitoring system with temperature compensation comprises the following steps:
(1) Selecting a proper monitoring point in a tail flue of the power plant, installing a flue gas monitoring system, and testing the temperature, pressure and flow of flue gas;
(2) Starting a carbon dioxide laser control measurement module, controlling the temperature and input current of a laser by using a laser controller, emitting laser from the laser, converting the laser into parallel light after passing through a laser collimator, and injecting the parallel light into a flue;
(3) The carbon dioxide in the flue gas selectively absorbs the incident parallel light, and the carbon dioxide has different absorption intensities to the parallel light with different wavelengths and shows the form of a carbon dioxide absorption peak;
(4) Parallel light absorbed by carbon dioxide is incident to a photoelectric detector, and the photoelectric detector converts a laser light signal into a voltage signal or a current signal;
(5) The data acquisition card acquires voltage signals or current signals and transmits the voltage signals or the current signals to the data processing system;
(6) The data processing system calculates the integral value of the spectral absorption rate in the full-wave number domain according to the measured carbon dioxide absorption spectral line based on the corresponding relation between the flue gas with the carbon dioxide concentration calibrated in advance and the integral value of the spectral absorption rate in the full-wave number domain at different temperatures, and calculates the actual carbon dioxide concentration of the flue gas at the corresponding temperature after temperature compensation;
(7) And the data processing system calculates to obtain the real-time carbon dioxide emission in the flue gas of the power plant according to the calculated concentration of the carbon dioxide in the flue gas and the calculated flow rate of the flue gas, so that the real-time monitoring of the carbon dioxide emission in the flue gas is completed.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Moreover, various embodiments or examples and features of various embodiments or examples described in this specification can be combined and combined by one skilled in the art without being mutually inconsistent.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless explicitly specified otherwise.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (9)
1. A power plant flue gas carbon dioxide emission monitoring system with temperature compensation is characterized by comprising a flue gas monitoring system, a data processing system and a carbon dioxide laser control measuring module, wherein the flue gas monitoring system is used for monitoring flue gas parameters, and the data processing system is used for processing data measured by the flue gas monitoring system and the carbon dioxide laser control measuring module; the carbon dioxide laser control measurement module comprises a laser controller, a laser collimator, a photoelectric detector and a data collector, wherein the laser controller is used for controlling the temperature and the input current of the laser; the laser is arranged at the downstream of the laser controller and is used for emitting laser; the laser collimator is arranged at the downstream of the laser and is used for converting the laser into parallel light; the photoelectric detector is arranged at the downstream of the laser collimator and is used for converting a laser signal into a voltage signal or a current signal; the data acquisition card is arranged at the downstream of the photoelectric detector and used for acquiring the voltage signal or the current signal.
2. The temperature compensated power plant flue gas carbon dioxide emission monitoring system of claim 1, wherein the flue gas parameters include flue gas temperature, flue gas pressure, and flue gas flow.
3. The temperature compensated power plant flue gas carbon dioxide emission monitoring system of claim 1 or 2, wherein the collimated light is incident into the flue gas, and carbon dioxide in the flue gas selectively absorbs the collimated light.
4. The temperature compensated power plant flue gas carbon dioxide emission monitoring system of claim 3, wherein the laser is one of a Fabry-Perot laser, a distributed feedback semiconductor laser, a distributed Bragg reflector laser, a vertical cavity surface emitting laser, or an external cavity tuned semiconductor laser.
5. The power plant flue gas carbon dioxide emission monitoring system with temperature compensation of claim 4, wherein the data processing system calculates the carbon dioxide concentration in the actual flue gas after performing temperature compensation according to the measured carbon dioxide absorption spectrum line based on the corresponding relationship between the carbon dioxide concentration and the carbon dioxide absorption spectrum line calibrated in advance.
6. The temperature-compensated power plant flue gas carbon dioxide emission monitoring system of claim 5, wherein the data processing system calculates carbon dioxide emissions from the carbon dioxide concentration and the flue gas flow.
7. The method of operating a temperature compensated power plant flue gas carbon dioxide emission monitoring system of claim 6, comprising the steps of:
(1) Selecting a proper monitoring point in a tail flue of the power plant, installing a flue gas monitoring system, and testing the temperature, pressure and flow of flue gas;
(2) Starting a carbon dioxide laser control measurement module, controlling the temperature and input current of a laser by using a laser controller, emitting laser from the laser, converting the laser into parallel light after passing through a laser collimator, and injecting the parallel light into a flue;
(3) The carbon dioxide in the flue gas selectively absorbs the incident parallel light, and the carbon dioxide has different absorption intensities to the parallel light with different wavelengths and shows the form of a carbon dioxide absorption peak;
(4) The parallel light absorbed by the carbon dioxide is incident to a photoelectric detector, and the photoelectric detector converts a laser light signal into a voltage signal or a current signal;
(5) The data acquisition card acquires the voltage signal or the current signal and transmits the voltage signal or the current signal to a data processing system;
(6) The data processing system calculates the integral value of the spectral absorption rate in the full-wave number domain according to the measured carbon dioxide absorption spectral line based on the corresponding relation between the flue gas with the carbon dioxide concentration calibrated in advance and the integral value of the spectral absorption rate in the full-wave number domain at different temperatures, and calculates the carbon dioxide concentration of the actual flue gas at the corresponding temperature after temperature compensation;
(7) And the data processing system calculates to obtain the real-time carbon dioxide emission in the flue gas of the power plant according to the calculated concentration of the carbon dioxide in the flue gas and the flow of the flue gas, so that the real-time monitoring of the carbon dioxide emission in the flue gas is completed.
8. The method of operating a temperature compensated power plant flue gas carbon dioxide emission monitoring system of claim 7, wherein the carbon dioxide concentration is calculated as: the formula I is as follows:
wherein X is the measured value of carbon dioxide concentration, A is the integral value of the absorptivity of the carbon dioxide absorption spectrum line, S (T) is the spectrum line intensity, P is the flue gas pressure, L is the optical path, and L is kept unchanged on a fixed device;
measuring the corresponding relation between the A/S (T) value and X at different temperatures, and performing linear fitting to obtain a formula II:
a/S (T) = cX + d, wherein c, d are linear fitting coefficients;
when the concentration of the carbon dioxide in the flue gas is monitored, A and (T) are respectively calculated according to the absorption spectrum line of the carbon dioxide in the flue gas, and the A and (T) are substituted into a formula I to obtain X 0 X is to be 0 And substituting the formula II to obtain A/S (T) of temperature compensation, and substituting the A/S (T) to the formula I to obtain X of temperature compensation, wherein X is the actual concentration of the carbon dioxide.
9. The method of operating a temperature compensated power plant flue gas carbon dioxide emission monitoring system of claim 7, wherein the carbon dioxide emissions are calculated by the formula: q = X X V, wherein Q is the carbon dioxide emission, X is the carbon dioxide concentration, and V is the flue gas flow rate.
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