A system for continuously monitoring carbon emissions in thermal power plants

Abstract

The present invention discloses a system for uninterruptedly monitoring carbon emissions in a thermal power plant, the system comprising: a flue gas sampling device, a host computer, a first sampling solenoid valve, a first zeroing solenoid valve, a first flue gas analyzer, a second sampling solenoid valve, a second zeroing solenoid valve and a second flue gas analyzer; the flue gas sampling device is used to collect flue gas in a flue, and transmit it to a first and a second flue gas analyzer respectively through a first and a second zeroing solenoid valve; when the first flue gas analyzer performs zeroing calibration, the host computer controls the first sampling solenoid valve to close, and controls the first zeroing solenoid valve to open; when the second flue gas analyzer performs zeroing calibration, the host computer controls the second sampling solenoid valve to close, and controls the second zeroing solenoid valve to open; wherein the zeroing calibration periods of the first flue gas analyzer and the second flue gas analyzer are different. By implementing the present invention, the carbon emissions in the flue can be continuously monitored during the zero point calibration of the system.

Description

Technical Field

[0001] The present invention relates to the field of carbon emission monitoring, and in particular to a system for continuously monitoring carbon emissions in a thermal power plant. Background Art

[0002] The current online carbon emission monitoring system requires zero point calibration. During the zero point calibration, carbon emission data cannot be obtained, resulting in missing carbon emission data during this period. The current conventional method is to use the data before the system zero point calibration to fill in the gaps, but this will result in inaccurate monitoring data. Therefore, how to enable the system to continuously monitor carbon emissions during the zero point calibration of the system is an urgent problem to be solved. Summary of the invention

[0003] The present invention provides a system for continuously monitoring carbon emissions in a thermal power station, which can continuously monitor carbon emissions during the zero point calibration period of the system.

[0004] The present invention provides a system for uninterruptedly monitoring carbon emissions in a thermal power plant, comprising: a flue gas sampling device, a host computer, a first sampling solenoid valve, a first zeroing solenoid valve, a first flue gas analyzer, a second sampling solenoid valve, a second zeroing solenoid valve and a second flue gas analyzer;

[0005] The sampling probe of the smoke sampling device is arranged in the smoke duct to be detected, and the gas outlet of the smoke sampling device is connected with the gas inlet of the first sampling solenoid valve and the gas inlet of the second sampling solenoid valve;

[0006] The gas outlet end of the first sampling solenoid valve is connected to the gas inlet end of the first flue gas analyzer, and the gas outlet end of the second sampling solenoid valve is connected to the gas inlet end of the second flue gas analyzer;

[0007] The air inlet end of the first zeroing solenoid valve is communicated with the external air, and the outlet end of the first zeroing solenoid valve is communicated with the air inlet end of the first flue gas analyzer; the air inlet end of the second zeroing solenoid valve is communicated with the external air, and the outlet end of the second zeroing solenoid valve is communicated with the air inlet end of the second flue gas analyzer;

[0008] The host computer is respectively connected to the first sampling solenoid valve, the first zeroing solenoid valve, the second sampling solenoid valve, the second zeroing solenoid valve, the first flue gas analyzer and the second flue gas analyzer for communication;

[0009] The first flue gas analyzer and the second flue gas analyzer are used to perform flue gas analysis on the flue gas collected by the flue gas sampling device and transmit the analysis results to the host computer;

[0010] The host computer is used to control the first sampling solenoid valve to be closed and the first zeroing solenoid valve to be opened when the first flue gas analyzer is performing zeroing calibration; and to control the second sampling solenoid valve to be closed and the second zeroing solenoid valve to be opened when the second flue gas analyzer is performing zeroing calibration; wherein the zeroing calibration time periods of the first flue gas analyzer and the second flue gas analyzer are different.

[0011] Further, it also includes: a heat tracing pipe;

[0012] The gas outlet end of the smoke sampling device is connected to the gas inlet end of the first sampling solenoid valve and the gas inlet end of the second sampling solenoid valve through the heating pipe;

[0013] The heating pipe is used to heat and keep the obtained flue gas warm.

[0014] Furthermore, it also includes: a first condenser, a first filter, a second filter, a second condenser, a third filter and a fourth filter;

[0015] The air outlet end of the first sampling solenoid valve and the air outlet end of the first zeroing solenoid valve are connected to the air inlet end of the first condenser, the air outlet end of the first condenser is connected to the air inlet end of the first filter, the air outlet end of the first filter is connected to the air inlet end of the second filter, and the air outlet end of the second filter is connected to the air inlet end of the first flue gas analyzer;

[0016] The gas outlet end of the second sampling solenoid valve and the gas outlet end of the second zeroing solenoid valve are connected to the gas inlet end of the second condenser, the gas outlet end of the second condenser is connected to the gas inlet end of the third filter, the gas outlet end of the third filter is connected to the gas inlet end of the fourth filter, and the gas outlet end of the fourth filter is connected to the gas inlet end of the second flue gas analyzer;

[0017] The first condenser is used to condense the flue gas passing through the first sampling solenoid valve; the second condenser is used to condense the flue gas passing through the second sampling solenoid valve;

[0018] The first filter is used to perform a first-stage filtration on the flue gas passing through the first condenser, and the second filter is used to perform a second-stage filtration on the flue gas passing through the first filter;

[0019] The third filter is used for performing a first-stage filtration on the flue gas passing through the second condenser, and the fourth filter is used for performing a second-stage filtration on the flue gas passing through the third filter.

[0020] Further, it also includes: a standard gas output device, a first calibration control valve and a second calibration control valve;

[0021] The gas outlet end of the first filter is connected to the first gas inlet end of the first calibration control valve, the gas outlet end of the first calibration control valve is connected to the gas inlet end of the second filter, and the gas outlet end of the second filter is connected to the first flue gas analyzer;

[0022] The gas outlet end of the third filter is connected to the first gas inlet end of the second calibration control valve, the gas outlet end of the second calibration control valve is connected to the gas inlet end of the fourth filter, and the gas outlet end of the fourth filter is connected to the second flue gas analyzer;

[0023] The gas outlet end of the standard gas output device is in communication with the second gas inlet end of the first calibration control valve and the second gas inlet end of the second calibration control valve;

[0024] The gas outlet end of the standard gas output device is in communication with the second gas inlet end of the first calibration control valve and the second gas inlet end of the second calibration control valve;

[0025] When performing range calibration on the first flue gas analyzer, the first air inlet end of the first calibration control valve is controlled to be closed, and the second air inlet end of the first calibration control valve is controlled to be opened; when performing range calibration on the second flue gas analyzer, the first air inlet end of the second calibration control valve is controlled to be closed, and the second air inlet end of the second calibration control valve is controlled to be opened; wherein the range calibration time periods of the first flue gas analyzer and the second flue gas analyzer are different.

[0026] Furthermore, the first flue gas analyzer and the second flue gas analyzer are used to perform flue gas analysis on the flue gas collected by the flue gas sampling device and transmit the analysis results to the host computer, including:

[0027] The first flue gas analyzer is used to analyze the carbon dioxide volume concentration of the flue gas passing through the first sampling solenoid valve, obtain first carbon dioxide volume concentration data, and send the first carbon dioxide volume concentration data to the host computer;

[0028] The second flue gas analyzer is used to analyze the carbon dioxide volume concentration of the flue gas passing through the second sampling solenoid valve, obtain second carbon dioxide volume concentration data, and send the second carbon dioxide volume concentration data to the host computer.

[0029] Further, it also includes: flue sensing equipment;

[0030] The flue sensor device is communicatively connected with the host computer;

[0031] The detection probe of the flue sensing device is arranged in the flue to be detected, and is used to detect the flue gas parameters of the flue gas; wherein the flue gas parameters include: detecting the temperature, static pressure, flow rate and moisture content of the flue gas in the flue;

[0032] The smoke temperature data, smoke pressure data and smoke flow rate data generated after the detection are sent to the host computer, so that the host computer calculates the dry smoke volume flow rate under standard conditions according to the smoke parameters.

[0033] Furthermore, the host computer calculates the dry flue gas volume flow rate under standard conditions according to the flue gas parameters, including:

[0034] The dry flue gas volume flow rate under standard conditions is calculated by the following formula:

[0035]

[0036] Among them, Q sn Indicates the dry flue gas volume flow rate under standard conditions; F indicates the area of ​​the measurement section; K v represents the velocity field coefficient; V p Indicates the wet flue gas velocity measured at the measurement section; t s Indicates flue gas temperature; B s Represents the atmospheric pressure constant; P s Indicates flue gas static pressure; X sw Indicates the humidity content of flue gas.

[0037] Furthermore, the host computer is further used to: calculate the mean of the first carbon dioxide volume concentration data and the second carbon dioxide volume concentration data to generate carbon dioxide volume concentration mean data;

[0038] The carbon emission data of the flue is calculated based on the mean value data of the carbon dioxide volume concentration and the dry flue gas volume flow data under standard conditions.

[0039] Furthermore, the carbon emission data of the flue is calculated according to the mean value data of the carbon dioxide volume concentration and the dry flue gas volume flow data under standard conditions, including:

[0040] The carbon emission rate is calculated according to the following formula:

[0041] G h =C s ×Q sn ×(44 / 22.4)×10-5

[0042] Among them, G h Represents the carbon emission rate; C s Represents the mean data of carbon dioxide volume concentration.

[0043] Furthermore, the host computer calculates the daily carbon emissions of the flue using the following formula:

[0044]

[0045] The monthly carbon emissions of the flue are calculated using the following formula:

[0046]

[0047] The annual carbon emissions of the flue are calculated using the following formula:

[0048]

[0049] Among them, G d Represents daily carbon dioxide emissions; G hi represents the daily carbon dioxide emissions in the i-th hour of the day; G m Represents monthly carbon dioxide emissions; G di represents the daily carbon dioxide emissions on the i-th day of the month; G y Represents annual carbon dioxide emissions; G di' represents the daily carbon dioxide emissions on the i-th day of the year; D m Indicates the number of days in the month; D y Indicates the day of the year.

[0050] The embodiments of the present invention have the following beneficial effects:

[0051] The present invention provides a system for uninterruptedly monitoring carbon emissions in a thermal power plant; the system comprises: a flue gas sampling device, a host computer, a first sampling solenoid valve, a first zeroing solenoid valve, a first flue gas analyzer, a second sampling solenoid valve, a second zeroing solenoid valve and a second flue gas analyzer; when the first flue gas analyzer needs to be zeroed and calibrated, it is only necessary to control the first sampling solenoid valve to be closed by the host computer to block the flue gas flowing into the first flue gas analyzer, and control the first zeroing solenoid valve to be opened to allow air to enter, and when the air passes through the first flue gas analyzer, the first flue gas analyzer can be zeroed and calibrated; similarly, when the second flue gas analyzer needs to be zeroed and calibrated, it is only necessary to control the second sampling solenoid valve to be closed by the host computer to block the flue gas flowing into the first flue gas analyzer, and control the second zeroing solenoid valve to be opened to allow air to enter, and when the air passes through the first flue gas analyzer, the second flue gas analyzer can be zeroed and calibrated, so that the zeroing and calibration time periods of the first flue gas analyzer and the second flue gas analyzer are different, and the system can realize uninterrupted carbon emission monitoring. By implementing the present invention, the carbon emission in the flue can be continuously detected during the zero point calibration of the flue gas analyzer in the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1This is a schematic diagram of the structure of a system for continuously monitoring carbon emissions in a thermal power plant provided by an embodiment of the present invention; DETAILED DESCRIPTION

[0053] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0054] like Figure 1 As shown, a system for uninterruptedly monitoring carbon emissions in a thermal power plant includes: a flue gas sampling device, a host computer, a first sampling solenoid valve, a first zeroing solenoid valve, a first flue gas analyzer, a second sampling solenoid valve, a second zeroing solenoid valve, and a second flue gas analyzer;

[0055] The sampling probe of the smoke sampling device is arranged in the smoke duct to be detected, and the gas outlet of the smoke sampling device is connected with the gas inlet of the first sampling solenoid valve and the gas inlet of the second sampling solenoid valve;

[0056] The gas outlet end of the first sampling solenoid valve is connected to the gas inlet end of the first flue gas analyzer, and the gas outlet end of the second sampling solenoid valve is connected to the gas inlet end of the second flue gas analyzer;

[0057] The air inlet end of the first zeroing solenoid valve is communicated with the external air, and the outlet end of the first zeroing solenoid valve is communicated with the air inlet end of the first flue gas analyzer; the air inlet end of the second zeroing solenoid valve is communicated with the external air, and the outlet end of the second zeroing solenoid valve is communicated with the air inlet end of the second flue gas analyzer;

[0058] The host computer is respectively connected to the first sampling solenoid valve, the first zeroing solenoid valve, the second sampling solenoid valve, the second zeroing solenoid valve, the first flue gas analyzer and the second flue gas analyzer for communication;

[0059] The first flue gas analyzer and the second flue gas analyzer are used to perform flue gas analysis on the flue gas collected by the flue gas sampling device and transmit the analysis results to the host computer;

[0060] The host computer is used to control the first sampling solenoid valve to be closed and the first zeroing solenoid valve to be opened when the first flue gas analyzer is performing zeroing calibration; and to control the second sampling solenoid valve to be closed and the second zeroing solenoid valve to be opened when the second flue gas analyzer is performing zeroing calibration; wherein the zeroing calibration time periods of the first flue gas analyzer and the second flue gas analyzer are different.

[0061] Specifically, after collecting the flue gas, the flue gas sampling device transmits the collected flue gas to the branch where the first sampling solenoid valve and the first flue gas analyzer are located, and transmits the flue gas to the branch where the second sampling solenoid valve and the second flue gas analyzer are located. At this time, the first flue gas analyzer and the second flue gas analyzer are in a period of working together; when the first flue gas analyzer has been working for a certain period of time and needs to be zeroed and calibrated as required, the upper computer sends a closing control signal to the first sampling solenoid valve, and sends an opening control signal to the first zeroing solenoid valve, so that the first sampling solenoid valve and the second flue gas analyzer are in a period of working together; when the first flue gas analyzer has been working for a certain period of time and needs to be zeroed and calibrated as required, the upper computer sends a closing control signal to the first sampling solenoid valve, and sends an opening control signal to the first zeroing solenoid valve, so that the first sampling solenoid valve and the second flue gas analyzer are in a period of working together; when the first flue gas analyzer has been working for a certain period of time and needs to be zeroed and calibrated as required, the upper computer sends a closing control signal to the first sampling solenoid valve, and sends an opening control signal to the first zeroing solenoid valve, so that the first sampling solenoid valve and the second flue gas analyzer are in a period of working together; when the first flue gas analyzer has been working for a certain period of time and needs to be zeroed and calibrated as required, the upper computer sends a closing control signal to the first sampling solenoid valve, and sends a ... A sampling solenoid valve is closed, and the first zeroing solenoid valve is opened; at this time, since the first sampling solenoid valve is closed, the flue gas in the branch is blocked and cannot enter the flue gas analyzer, and since the first zeroing solenoid valve is opened, external air is drawn into the branch to pre-purge the subsequent pipelines and analyzers, so that the first flue gas analyzer uses the full air as zero gas and the zero gas as the zeroing indicator for zeroing calibration. After the zeroing calibration is completed, the upper computer controls the first sampling solenoid valve to open and the first zeroing solenoid valve to close.

[0062] Similarly, when the second flue gas analyzer has been working for a certain period of time and needs to be zeroed and calibrated as required, the host computer will send a closing control signal to the second sampling solenoid valve and an opening control signal to the second zeroing solenoid valve, so that the first sampling solenoid valve is closed and the first zeroing solenoid valve is opened; the same as the zeroing and calibration of the first flue gas analyzer, the second flue gas analyzer will eventually be filled with air, and the filled air will be used as zero gas, and the zero gas will be used as the zeroing indicator for zeroing and calibration, and after the zeroing is completed, the second sampling solenoid valve will be controlled to open and the second zeroing solenoid valve will be controlled to close by the host computer.

[0063] During the zeroing calibration of the first flue gas analyzer, the second flue gas analyzer continues to work, at which time the host computer shields the analysis data provided by the first flue gas analyzer, and then uses the analysis data provided by the second flue gas analyzer as subsequent calculation data; similarly, during the zeroing calibration of the second flue gas analyzer, the first flue gas analyzer continues to work, at which time the host computer shields the analysis data provided by the second flue gas analyzer, and uses the analysis data provided by the first flue gas analyzer as subsequent calculation data; in this way, the carbon emissions in the flue can be continuously monitored during the zeroing calibration of the system;

[0064] In an optional embodiment, the zeroing calibration period of the first delay analyzer and the second flue gas analyzer includes but is not limited to: 4 hours; in this case, it is only necessary to stagger the working hours of the first flue gas analyzer and the second flue gas analyzer by 2 hours, and then in the subsequent process, the system will perform zeroing calibration every two hours, and during the zeroing calibration, the system can continuously monitor the carbon emissions of the flue gas in the flue.

[0065] In an optional embodiment, the flue gas sampling equipment is composed of a sampling probe and a sampling box, the air inlet end of the sampling probe is inside the flue, and the air outlet end is connected to the sampling box; after collecting the flue gas in the flue, the sampling probe transmits the flue gas to the sampling box; the extracted flue gas has a high temperature and humidity, and in order to prevent the water in the flue gas from liquefying to form acid mist, a heater is provided in the sampling box, and the collected flue gas is insulated and heated by the heater, and the heater is communicatively connected to the host computer, and the heating is controlled by the host computer.

[0066] In an optional embodiment, it also includes: a heating pipe, which has a heating function to keep the flue gas at a high temperature during transmission and prevent the moisture in the flue gas from forming acid mist due to a drop in temperature.

[0067] The gas outlet end of the smoke sampling device is connected to the gas inlet end of the first sampling solenoid valve and the gas inlet end of the second sampling solenoid valve through the heating pipe;

[0068] Similarly, in order to prevent the water content of the flue gas from liquefying and forming acid mist, the flue gas is heated and insulated by a heating pipe during the process of transmitting the flue gas to the first sampling solenoid valve; the heating pipe is also communicatively connected to the host computer, and the heating is controlled by the host computer.

[0069] In a preferred embodiment, it further comprises: a first condenser, a first filter, a second filter, a second condenser, a third filter and a fourth filter;

[0070] The air outlet end of the first sampling solenoid valve and the air outlet end of the first zeroing solenoid valve are connected to the air inlet end of the first condenser, the air outlet end of the first condenser is connected to the air inlet end of the first filter, the air outlet end of the first filter is connected to the air inlet end of the second filter, and the air outlet end of the second filter is connected to the air inlet end of the first flue gas analyzer;

[0071] The gas outlet end of the second sampling solenoid valve and the gas outlet end of the second zeroing solenoid valve are connected to the gas inlet end of the second condenser, the gas outlet end of the second condenser is connected to the gas inlet end of the third filter, the gas outlet end of the third filter is connected to the gas inlet end of the fourth filter, and the gas outlet end of the fourth filter is connected to the gas inlet end of the second flue gas analyzer;

[0072] The first condenser is used to condense the flue gas passing through the first sampling solenoid valve; the second condenser is used to condense the flue gas passing through the second sampling solenoid valve;

[0073] The first filter is used to perform a first-stage filtration on the flue gas passing through the first condenser, and the second filter is used to perform a second-stage filtration on the flue gas passing through the first filter;

[0074] The third filter is used for performing a first-stage filtration on the flue gas passing through the second condenser, and the fourth filter is used for performing a second-stage filtration on the flue gas passing through the third filter.

[0075] Specifically, the flue gas passing through the first sampling solenoid valve and the second sampling solenoid valve has a high temperature and humidity, and needs to be cooled and filtered before the flue gas analysis.

[0076] For the branch where the first sampling solenoid valve is located, the first condenser will condense the high-temperature and high-humidity flue gas into dry cold-dried flue gas and output it; then it will go through the first and second filtrations to filter out the dust in the flue gas, and then the filtered cold-dried flue gas will be transported to the first flue gas analyzer for analysis; for the branch where the second sampling solenoid valve is located, the principle is the same, and finally the filtered cold-dried flue gas will be transported to the second flue gas analyzer for analysis, which will not be repeated here.

[0077] In an optional embodiment, it also includes: a first peristaltic pump, a second peristaltic pump, a first flow control valve, a second flow control valve, a first air pump and a second air pump.

[0078] The water outlet of the first condenser is connected to the water inlet of the first peristaltic pump, and the water outlet of the first peristaltic pump discharges sewage; the water outlet of the second condenser is connected to the water inlet of the second peristaltic pump, and the water outlet of the second peristaltic pump discharges sewage.

[0079] The outlet end of the first sampling solenoid valve is connected to the inlet end of the first flow control valve, and the outlet end of the first flow control valve is connected to the inlet end of the first condenser; the outlet end of the second sampling solenoid valve is connected to the inlet end of the second flow control valve, and the outlet end of the second flow control valve is connected to the inlet end of the second condenser.

[0080] The air outlet end of the first filter is connected to the air inlet end of the first air pump, and the air outlet end of the first air pump is connected to the air inlet end of the second filter; the air outlet end of the third filter is connected to the air inlet end of the second air pump, and the air outlet end of the second air pump is connected to the air inlet end of the fourth filter.

[0081] The vacuum pump provides power to the smoke in the system. The sampling probe is provided with a filter device but no power device.

[0082] In a preferred embodiment, it further comprises: a standard gas output device, a first calibration control valve and a second calibration control valve;

[0083] The gas outlet end of the first filter is connected to the first gas inlet end of the first calibration control valve, the gas outlet end of the first calibration control valve is connected to the gas inlet end of the second filter, and the gas outlet end of the second filter is connected to the first flue gas analyzer;

[0084] The gas outlet end of the third filter is connected to the first gas inlet end of the second calibration control valve, the gas outlet end of the second calibration control valve is connected to the gas inlet end of the fourth filter, and the gas outlet end of the fourth filter is connected to the second flue gas analyzer;

[0085] The gas outlet end of the standard gas output device is in communication with the second gas inlet end of the first calibration control valve and the second gas inlet end of the second calibration control valve;

[0086] When performing range calibration on the first flue gas analyzer, the first air inlet end of the first calibration control valve is controlled to be closed, and the second air inlet end of the first calibration control valve is controlled to be opened; when performing range calibration on the second flue gas analyzer, the first air inlet end of the second calibration control valve is controlled to be closed, and the second air inlet end of the second calibration control valve is controlled to be opened; wherein the range calibration time periods of the first flue gas analyzer and the second flue gas analyzer are different.

[0087] Specifically, in combination with an embodiment, the air outlet end of the first air pump is connected to the first air inlet end of the first calibration control valve, and the air outlet end of the first calibration control valve is connected to the air inlet end of the second filter; the air outlet end of the second air pump is connected to the first air inlet end of the second calibration control valve, and the air outlet end of the second calibration control valve is connected to the air inlet end of the fourth filter.

[0088] When it is necessary to perform range calibration on the first flue gas analyzer, the upper computer first shields the analysis data uploaded by the first flue gas analyzer, and then controls the first air inlet end of the first calibration control valve to be closed, and controls the second air inlet end of the first calibration control valve to be opened, so as to block the flow of flue gas and allow the standard gas to enter the first flue gas analyzer. After a period of time (including but not limited to 10S), the reading on the instrument is stable, and the range calibration is performed on the instrument; after the calibration is completed, the first control valve is manually operated to control the first air inlet end of the first calibration control valve to be opened, and the second air inlet end of the first calibration control valve to be closed, so as to block the standard gas and allow the flue gas to flow. After a certain period of time, the upper computer removes the shielding of the first flue gas analyzer. When the second flue gas analyzer is calibrated, its principle is the same as that of the first flue gas analyzer, which will not be repeated here.

[0089] In a preferred embodiment, the first flue gas analyzer and the second flue gas analyzer are used to perform flue gas analysis on the flue gas collected by the flue gas sampling device and transmit the analysis results to the host computer, including:

[0090] The first flue gas analyzer is used to analyze the carbon dioxide volume concentration of the flue gas passing through the first sampling solenoid valve, obtain first carbon dioxide volume concentration data, and send the first carbon dioxide volume concentration data to the host computer;

[0091] The second flue gas analyzer is used to analyze the carbon dioxide volume concentration of the flue gas passing through the second sampling solenoid valve, obtain second carbon dioxide volume concentration data, and send the second carbon dioxide volume concentration data to the host computer.

[0092] Specifically, in an optional embodiment, the first flue gas analyzer analyzes the carbon dioxide volume concentration and oxygen concentration of the flue gas passing through the first sampling solenoid valve, obtains first carbon dioxide volume concentration data and first oxygen concentration data, and sends the carbon dioxide volume concentration data and oxygen concentration data to the host computer. Similarly, the second flue gas analyzer analyzes the carbon dioxide volume concentration and oxygen concentration of the flue gas passing through the second sampling solenoid valve, obtains second carbon dioxide volume concentration data and first oxygen concentration data, and sends the second carbon dioxide volume concentration data and second oxygen concentration data to the host computer.

[0093] In an optional embodiment, the host computer compares the first oxygen concentration data and the second oxygen concentration data with a preset calibration value. If the first oxygen concentration data is greater than the preset calibration value and the second oxygen concentration data is less than the preset calibration value, it is determined that there is a leak in the branch where the first flue gas analyzer is located in the system; if the first oxygen concentration data is less than the preset calibration value and the second oxygen concentration data is greater than the preset calibration value, it is determined that there is a leak in the branch where the second flue gas analyzer is located in the system; if the first oxygen concentration data and the second oxygen concentration data are both greater than the preset calibration value, it is determined that there is a leak in the branch where the first flue gas analyzer and the second flue gas analyzer are located in the system; if the first oxygen concentration data and the second oxygen concentration data are both less than the preset calibration value, it is determined that there is no leakage fault in the system; wherein the preset calibration value includes but is not limited to: 21%.

[0094] In a preferred embodiment, it also includes: a flue sensing device;

[0095] The flue sensor device is communicatively connected with the host computer;

[0096] The detection probe of the flue sensing device is arranged in the flue to be detected, and is used to detect the flue gas parameters of the flue gas; wherein the flue gas parameters include: detecting the temperature, static pressure, flow rate and moisture content of the flue gas in the flue;

[0097] The smoke temperature data, smoke pressure data and smoke flow rate data generated after the detection are sent to the host computer, so that the host computer calculates the dry smoke volume flow rate under standard conditions according to the smoke parameters.

[0098] Specifically, the flue sensing device is equipped with a plurality of sensors at the same time; wherein the equipped sensors include but are not limited to: a temperature sensor, a static pressure sensor, a flow rate sensor and a moisture content sensor.

[0099] The flue gas sensing device can simultaneously detect the temperature, static pressure, flow rate and moisture content of the flue gas, and send the flue gas temperature data, flue gas pressure data and flue gas flow rate data generated after the detection to the host computer, so that the host computer calculates the dry flue gas volume flow rate under standard conditions according to the flue gas parameters;

[0100] In a preferred embodiment, the dry flue gas volume flow rate under standard conditions is calculated by the following formula:

[0101]

[0102] Among them, Q sn It indicates the dry flue gas volume flow rate under standard conditions, in cubic meters per hour (m3 / h); F indicates the area of ​​the measurement section, in square meters (m2); K v represents the velocity field coefficient; V p It indicates the wet flue gas velocity measured at the measuring section, in meters per second (m / s); t s Indicates the flue gas temperature in degrees Celsius (℃); B s Represents the atmospheric pressure constant, in Pascal (Pa); P s Indicates the static pressure of flue gas, in Pascal (Pa); X sw Indicates the humidity content of flue gas, in percentage (%).

[0103] In a preferred embodiment, the host computer is further used to: calculate the mean of the first carbon dioxide volume concentration data and the second carbon dioxide volume concentration data to generate carbon dioxide volume concentration mean data;

[0104] The carbon emission data of the flue is calculated based on the mean value data of the carbon dioxide volume concentration and the dry flue gas volume flow data under standard conditions.

[0105] Specifically, in an optional embodiment, while the first flue gas analyzer and the second flue gas analyzer are working together, the host computer calculates the average of the first carbon dioxide volume concentration data and the second carbon dioxide volume concentration data to generate carbon dioxide volume concentration average data, and uses the carbon dioxide volume concentration average data and the dry flue gas volume flow data under standard conditions to calculate the carbon emission data of the flue.

[0106] When the second flue gas analyzer is calibrated to zero or range, the host computer calculates the carbon emission data of the flue according to the carbon dioxide volume concentration data uploaded by the first flue gas analyzer and the dry flue gas volume flow data under standard conditions. Similarly, when the first flue gas analyzer is calibrated to zero or range, the host computer calculates the carbon emission data of the flue according to the carbon dioxide volume concentration data uploaded by the second flue gas analyzer and the dry flue gas volume flow data under standard conditions. It should be noted that since the flue gas is dry-cooled after passing through the condenser, the carbon dioxide volume concentration data finally analyzed by the flue gas analyzer can also be called the dry-based volume concentration of carbon dioxide.

[0107] In a preferred embodiment, the carbon emission rate is calculated according to the following formula:

[0108] G h =C s ×Q sn ×(44 / 22.4)×10-5

[0109] G h Indicates the carbon emission rate in tons per hour (t / h); C s It represents the mean value of carbon dioxide volume concentration, in volume percentage (%).

[0110] In a preferred embodiment, the daily carbon emission of the flue is calculated by the following formula:

[0111]

[0112] The monthly carbon emissions of the flue are calculated using the following formula:

[0113]

[0114] The annual carbon emissions of the flue are calculated using the following formula:

[0115]

[0116] Among them, G d Indicates the daily carbon dioxide emissions in tons per day (t / d); G hirepresents the daily carbon dioxide emissions in the ith hour of the day, in tons per hour (t / h); G m Indicates monthly carbon dioxide emissions in tons per month (t / m); G di represents the daily carbon dioxide emissions on the ith day of the month, in tons per day (t / d); G y Indicates the annual carbon dioxide emissions, in tons per year (t / a); G di' represents the daily carbon dioxide emissions on the i-th day of the year, in tons per day (t / d); D m Indicates the number of days in the month; D y Indicates the day of the year.

[0117] In an optional embodiment, it further includes: an externally purchased electricity meter and a biomass carbon emission detector;

[0118] The outsourced electricity meter and the biomass carbon emission detector are respectively connected to the host computer for communication.

[0119] The biomass carbon emission detector is used to transmit pre-calculated total carbon emission data of daily purchased electricity to the host computer.

[0120] The biomass carbon emission detector is used to transmit the pre-calculated total carbon emission data of biomass burning every day to the host computer; it should be noted that the biomass carbon emission detector in the present invention uses the existing commonly used analyzer, and the calculation of the total carbon emission data of biomass burning every day also adopts the existing conventional calculation method, which will not be discussed in detail here.

[0121] In an optional embodiment, the statistics of the purchased electricity are the main work of calculating the carbon dioxide emissions generated by the purchased electricity. The purchased electricity emissions are calculated by multiplying the purchased electricity by the grid emission factor.

[0122] E D =AD D ×EF D

[0123] Among them, E D A represents the carbon dioxide emitted from purchased electricity (tCo); D Represents the net electricity purchased by the enterprise (Mwh); EF D represents the average power supply emission factor of the regional power grid (tCO / MWh);

[0124] The purchased electricity volume shall be based on the meter records of the power generation enterprise, or the data on the electricity bill invoice provided by the supplier may also be used. The power supply emission factor adopts the emission factor of each region according to the regional division, or the latest value released by the Ministry of Ecology and Environment. my country's power supply emission factors are divided into Northeast China, North China, East China, Central China, Northwest China, and Southern China power grid emission factors by region. Every year, the national competent department will announce the emission factors of regional power grids.

[0125] At this point, carbon emissions can be calculated using the following formula:

[0126]

[0127] Among them, E wd It represents the total carbon emissions of purchased electricity per day, in tons (t); E csd It represents the total carbon emissions from burning biomass every day, in tons (t).

[0128] By implementing the above-mentioned embodiments of the present invention, the carbon emission in the flue can be continuously monitored during the zero point calibration of the system.

[0129] The above is a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications are also regarded as protection of the present invention.

Claims

1. A system for continuously monitoring carbon emissions in a thermal power plant, characterized in that: include: Flue gas sampling equipment, a host computer, a first sampling solenoid valve, a first zeroing solenoid valve, a first flue gas analyzer, a second sampling solenoid valve, a second zeroing solenoid valve, a second flue gas analyzer and a flue sensor device; The sampling probe of the smoke sampling device is arranged in the smoke duct to be detected, and the gas outlet of the smoke sampling device is connected with the gas inlet of the first sampling solenoid valve and the gas inlet of the second sampling solenoid valve; The gas outlet end of the first sampling solenoid valve is connected to the gas inlet end of the first flue gas analyzer, and the gas outlet end of the second sampling solenoid valve is connected to the gas inlet end of the second flue gas analyzer; The air inlet end of the first zeroing solenoid valve is communicated with the external air, and the outlet end of the first zeroing solenoid valve is communicated with the air inlet end of the first flue gas analyzer; the air inlet end of the second zeroing solenoid valve is communicated with the external air, and the outlet end of the second zeroing solenoid valve is communicated with the air inlet end of the second flue gas analyzer; The host computer is respectively connected to the first sampling solenoid valve, the first zeroing solenoid valve, the second sampling solenoid valve, the second zeroing solenoid valve, the first flue gas analyzer and the second flue gas analyzer for communication; The first flue gas analyzer is used to analyze the carbon dioxide volume concentration of the flue gas passing through the first sampling solenoid valve, obtain first carbon dioxide volume concentration data, and send the first carbon dioxide volume concentration data to the host computer; The second flue gas analyzer is used to analyze the carbon dioxide volume concentration of the flue gas passing through the second sampling solenoid valve, obtain second carbon dioxide volume concentration data, and send the second carbon dioxide volume concentration data to the host computer; The host computer is used to control the first sampling solenoid valve to be closed and the first zeroing solenoid valve to be opened when the first flue gas analyzer is performing zeroing calibration; and to control the second sampling solenoid valve to be closed and the second zeroing solenoid valve to be opened when the second flue gas analyzer is performing zeroing calibration; wherein the zeroing calibration periods of the first flue gas analyzer and the second flue gas analyzer are different; The flue sensor device is communicatively connected with the host computer; The detection probe of the flue sensing device is arranged in the flue to be detected, and is used to detect the flue gas parameters of the flue gas; wherein the flue gas parameters include: detecting the temperature, static pressure, flow rate and moisture content of the flue gas in the flue; The flue gas temperature data, flue gas pressure data and flue gas flow rate data generated after the detection are sent to the host computer, so that the host computer calculates the dry flue gas volume flow rate under the standard state according to the flue gas parameters; wherein the dry flue gas volume flow rate under the standard state is calculated by the following formula: Among them, Q sn Indicates the dry flue gas volume flow rate under standard conditions; F indicates the area of ​​the measurement section; K v represents the velocity field coefficient; V p Indicates the wet flue gas velocity measured at the measurement section; t s Indicates flue gas temperature; B s Represents the atmospheric pressure constant; P s Indicates flue gas static pressure; X sw Indicates the humidity content of flue gas.

2. The uninterrupted carbon emission monitoring system for a thermal power plant according to claim 1, characterized in that: Also includes: Heat tracing pipes; The gas outlet end of the smoke sampling device is connected to the gas inlet end of the first sampling solenoid valve and the gas inlet end of the second sampling solenoid valve through the heating pipe; The heating pipe is used to heat and keep the obtained flue gas warm.

3. The uninterrupted carbon emission monitoring system for a thermal power plant according to claim 2, characterized in that: Also includes: a first condenser, a first filter, a second filter, a second condenser, a third filter, and a fourth filter; The air outlet end of the first sampling solenoid valve and the air outlet end of the first zeroing solenoid valve are connected to the air inlet end of the first condenser, the air outlet end of the first condenser is connected to the air inlet end of the first filter, the air outlet end of the first filter is connected to the air inlet end of the second filter, and the air outlet end of the second filter is connected to the air inlet end of the first flue gas analyzer; The gas outlet end of the second sampling solenoid valve and the gas outlet end of the second zeroing solenoid valve are connected to the gas inlet end of the second condenser, the gas outlet end of the second condenser is connected to the gas inlet end of the third filter, the gas outlet end of the third filter is connected to the gas inlet end of the fourth filter, and the gas outlet end of the fourth filter is connected to the gas inlet end of the second flue gas analyzer; The first condenser is used to condense the flue gas passing through the first sampling solenoid valve; the second condenser is used to condense the flue gas passing through the second sampling solenoid valve; The first filter is used to perform a first-stage filtration on the flue gas passing through the first condenser, and the second filter is used to perform a second-stage filtration on the flue gas passing through the first filter; The third filter is used for performing a first-stage filtration on the flue gas passing through the second condenser, and the fourth filter is used for performing a second-stage filtration on the flue gas passing through the third filter.

4. The uninterrupted carbon emission monitoring system for a thermal power plant according to claim 3, characterized in that: Also includes: A standard gas output device, a first calibration control valve, and a second calibration control valve; The gas outlet end of the first filter is connected to the first gas inlet end of the first calibration control valve, the gas outlet end of the first calibration control valve is connected to the gas inlet end of the second filter, and the gas outlet end of the second filter is connected to the first flue gas analyzer; The gas outlet end of the third filter is connected to the first gas inlet end of the second calibration control valve, the gas outlet end of the second calibration control valve is connected to the gas inlet end of the fourth filter, and the gas outlet end of the fourth filter is connected to the second flue gas analyzer; The gas outlet end of the standard gas output device is in communication with the second gas inlet end of the first calibration control valve and the second gas inlet end of the second calibration control valve; When performing range calibration on the first flue gas analyzer, the first air inlet end of the first calibration control valve is controlled to be closed, and the second air inlet end of the first calibration control valve is controlled to be opened; when performing range calibration on the second flue gas analyzer, the first air inlet end of the second calibration control valve is controlled to be closed, and the second air inlet end of the second calibration control valve is controlled to be opened; wherein the range calibration time periods of the first flue gas analyzer and the second flue gas analyzer are different.

5. The uninterrupted carbon emission monitoring system for a thermal power plant according to claim 1, characterized in that: The host computer is further used to: calculate the mean of the first carbon dioxide volume concentration data and the second carbon dioxide volume concentration data to generate carbon dioxide volume concentration mean data; The carbon emission data of the flue is calculated based on the mean value data of the carbon dioxide volume concentration and the dry flue gas volume flow data under standard conditions.

6. The uninterrupted carbon emission monitoring system for a thermal power plant according to claim 5, characterized in that: The calculating of flue carbon emission data according to the carbon dioxide volume concentration mean data and the dry flue gas volume flow data under standard conditions includes: The carbon emission rate is calculated according to the following formula: G h =C s ×Q sn ×(44 / 22.4)×10-5 Among them, G h Represents the carbon emission rate; C s Represents the mean data of carbon dioxide volume concentration.

7. The uninterrupted carbon emission monitoring system for a thermal power plant according to claim 6, characterized in that: The host computer calculates the daily carbon emissions of the flue using the following formula: The monthly carbon emissions of the flue are calculated using the following formula: The annual carbon emissions of the flue are calculated using the following formula: Among them, G d Represents daily carbon dioxide emissions; G hi represents the daily carbon dioxide emissions in the i-th hour of the day; G m Represents monthly carbon dioxide emissions; G di represents the daily carbon dioxide emissions on the i-th day of the month; G y Represents annual carbon dioxide emissions; G di' represents the daily carbon dioxide emissions on the i-th day of the year; D m Indicates the number of days in the month; D y Indicates the day of the year.

Images