Detection and calibration device and method for stationary pollution source flue gas preprocessor

Abstract

The invention discloses a detection and calibration device and method for a stationary pollution source flue gas preprocessor. The detection and calibration device comprises a gas generation module, a constant temperature module, a humidity generation module, a multi-element gas proportioning module and a gas uniform mixing and storage module, the gas generation module is connected with the constant temperature module, the constant temperature module is used for heating gas output by the gas generation module, the constant temperature module is connected with the humidity generation module and the multi-element gas proportioning module, the humidity generation module is used for humidifying the gas, and the multi-element gas proportioning module is used for proportioning the multi-element gas. And the gas mixing and storing module is connected with the multi-element gas proportioning module and is used for mixing the humidified gas with the dry gas and storing the gas.

Description

Technical Field

[0001] The present invention relates to the technical field of flue gas preprocessor detection, and more particularly to a detection and calibration device and method for a fixed pollution source flue gas preprocessor. Background Art

[0002] Stationary pollution sources generally refer to fixed sources of atmospheric pollutants, including boilers and kilns in factories, enterprises, institutions, and the food service industry, as well as exhaust pipes used by residents. Boilers are one of the main emitters of stationary atmospheric pollution sources. With the development of human production and the prosperity of life, especially the development of modern industry and energy, the harm caused by pollutants emitted by stationary atmospheric pollution sources to the environment has become increasingly apparent. In order to further verify whether the content of harmful substances in the exhaust gas emitted by stationary pollution sources meets relevant national or local emission standards and total amount control, more accurate measurement of the content of harmful substances in the exhaust gas is necessary.

[0003] The publication number is CN205562259U, and the name is a flue gas preprocessor for a continuous flue gas emission monitoring system. It includes a sampling pipe (1), a heat tracing pipe (2), a condenser (3), a filter (4), an adjustable rotor flowmeter (5), and a gas analyzer (6) connected in sequence. A backflush module is connected between the sampling pipe and the heat tracing pipe via a one-way valve (7). The backflush module includes a ball valve (8), a pressure regulating filter (9), a gas storage tank (10), and a backflush valve (11) connected in sequence. The backflush valve is connected to the one-way valve. The beneficial effects of the utility model are to optimize the flue gas gas path flow of the continuous flue gas emission monitoring system equipment, improve the average trouble-free operation time of the online equipment, optimize the sampling process, optimize the calibration gas path, and greatly improve the stability and reliability of the system.

[0004] Currently, the verification / calibration techniques for flue gas analyzers are based on JJG 962-2002, "Verification Procedure for Flue Gas Analyzers," JJF1585-2016, "Calibration Specification for Continuous Monitoring Systems for Flue Gas Emissions from Stationary Pollution Sources," and JJF 1362-2012, "Outline for Type Evaluation of Flue Gas Analyzers." None of these standards address testing requirements for flue gas preconditioners. While metrology departments can test common parameters such as preconditioner dew point and dehydration rate, provincial-level research institutes in China, with advanced technology, are actively exploring both equipment and methods for testing parameters such as sulfur dioxide loss rate.

[0005] Therefore, how to provide a fixed pollution source flue gas preprocessor detection and calibration device and method is a problem that technical personnel in this field urgently need to solve. Summary of the Invention

[0006] In view of this, the present invention provides a detection and calibration device and method for a fixed pollution source flue gas preprocessor, which aims to solve the technical problem that the inner cavity of the constant temperature module is large in volume and is not a closed space, making it difficult to complete the mixing of sulfur dioxide; during the mixing process, there will be oxygen in the inner cavity of the constant temperature module. Under the conditions of oxygen, water vapor and sulfur dioxide at the same time, a chemical reaction may occur to generate sulfuric acid, which will further corrode equipment components. During the gas distribution process, sulfur dioxide dissolves in water.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] A detection and calibration device for a fixed pollution source flue gas preprocessor, comprising: a gas generation module, a constant temperature module, a humidity generation module, a multi-gas proportioning module, and a gas mixing and storage module;

[0009] The gas generation module is connected to a constant temperature module, which is used to heat the gas output by the gas generation module. The constant temperature module is connected to the humidity generation module and the multi-gas matching module, which is used to humidify the gas. The gas mixing and storage module is connected to the multi-gas matching module, which is used to mix the humidified gas with the dry gas and store the gas.

[0010] Further, the gas generating module includes a first gas output unit and a second gas output unit;

[0011] The first gas output unit is used to store SO2 gas and output it to the constant temperature module, and the second gas output unit is used to store N2 gas and output it to the constant temperature module.

[0012] Furthermore, a proportional valve and a flow meter are installed between the gas generation module and the constant temperature module. The proportional valve is used to control the proportion of gas output from the gas generation module to the constant temperature module, and the flow meter is used to measure the flow rate of gas output from the gas generation module to the constant temperature module.

[0013] Furthermore, the multi-gas proportioning module includes a first mixing valve and a second mixing valve, one input end of the first mixing valve is connected to the constant temperature module, and the other input end is connected to the humidity generating module, one input end of the second mixing valve is connected to the first mixing valve, and the other input end is connected to the constant temperature module, and the output end of the second mixing valve is connected to the storage module.

[0014] Furthermore, a constant temperature chamber is provided, in which the constant temperature module, humidity generating module, multi-element gas proportioning module, and gas mixing and storage module are all provided;

[0015] A temperature sensor is also provided in the constant temperature chamber.

[0016] Furthermore, a user operation module is provided, which is connected to the proportional valve and the flow meter and is used for setting parameter values.

[0017] Furthermore, the humidity generating module is specifically composed of a humidifying unit and a four-stage oil-water separation unit. The humidifying unit is connected in series with the four-stage oil-water separation unit. The humidifying unit produces water vapor and inputs it into the four-stage oil-water separation unit. The four-stage oil-water separation unit filters liquid water and micro water droplets to obtain gaseous water vapor.

[0018] A method for detecting and calibrating a flue gas preprocessor for a fixed pollution source comprises the following steps:

[0019] S1. Detecting stability performance: Set the preprocessor temperature to the target temperature and preheat to stabilize it. Place the temperature probe of the temperature and humidity inspection instrument at the same position as the smoke temperature probe of the preprocessor. After the temperature stabilizes, read a value every h time. Read n groups of values ​​and calculate the stability performance based on these n groups of values.

[0020] S2. Dehydration efficiency testing: Divide the experimental environment into three zones, set the temperature and relative humidity for each zone, and after the temperature and humidity of the experimental environment stabilize, obtain the temperature, humidity, and dew point of the experimental environment, calculate the moisture content as the initial value, obtain the temperature, humidity, and dew point of the gas discharged from the preprocessor, calculate the moisture content as the final value, and calculate the dehydration efficiency based on the initial and final values;

[0021] S3. Detect the loss rate of SO2 components: dilute the standard gas, and after the mixed gas stabilizes, pass it into a flue gas analyzer that has withered and is in normal working condition, measure the initial concentration of each component in the mixed gas, and record the initial value of each component in the mixed gas. Pass the mixed gas into a fixed pollution source flue gas preprocessor, and after it stabilizes, mix the gas at the outlet of the preprocessor and pass it into the flue gas analyzer that has withered and is in normal working condition again. After stabilization, record the results to obtain the final value, and calculate the conversion efficiency of the instrument to be tested based on the initial and final values.

[0022] Furthermore, the calculation formula of stability performance is:

[0023] δ=T max -T min

[0024] Where, T max is the maximum temperature measurement, T min The minimum value of temperature measurement, in °C;

[0025] The calculation formula for dehydration efficiency is:

[0026]

[0027] Where η is the dehydration efficiency, η 初 is the initial value of moisture content, η 终 It is the moisture content after the pre-processor.

[0028] Furthermore, the calculation formula for the SO2 component loss rate is:

[0029] When the initial concentration In the range of 50-250 μmol / mol and >250 μmol / mol:

[0030]

[0031] When the initial concentration In the range of 0-50 μmol / mol:

[0032]

[0033] Where, SO 2丢 is the loss rate, SO 2初 is the initial value, SO 2终 is the final value after the preprocessor.

[0034] The present invention discloses a detection and calibration device and method for a flue gas preprocessor of a fixed pollution source. Compared with the existing technology, the present invention can set the target temperature, humidity and sulfur dioxide concentration through the user operation module, and then the constant temperature module and the constant humidity module continuously supply temperature and humidity. High-purity nitrogen, sulfur dioxide and water vapor reach the mixing and storage module in a certain proportion through the mass flow controller, and the air in the cavity is emptied until the cavity is filled with mixed gas and reaches dynamic equilibrium. Afterwards, a dew point meter is used to measure the dew point temperature of the mixed gas, and a temperature and humidity patrol meter measures the temperature and humidity of the mixed gas before and after entering the flue gas preprocessor, and calculates the temperature fluctuation range and the dehumidification efficiency indication error; a flue gas analyzer is used to measure the sulfur dioxide concentration in the mixed gas before and after entering the flue gas preprocessor, and calculates the sulfur dioxide loss rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0036] Figure 1 The figure is a schematic diagram of the gas path structure of a detection and calibration device for a flue gas preprocessor of a fixed pollution source according to the present invention.

[0037] Figure 2 This is a schematic diagram of the moisture content standard value calculation interface of a fixed pollution source flue gas preprocessor detection and calibration device of the present invention.

[0038] Figure 3 This is a schematic diagram of the placement of sensors in a mixing chamber of a fixed pollution source flue gas preprocessor detection and calibration device of the present invention. DETAILED DESCRIPTION

[0039] The following is a clear and complete description of the technical solutions in the embodiments 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 making any creative efforts are within the scope of protection of the present invention.

[0040] See attached Figure 1 , the embodiment of the present invention discloses a gas generation module, a constant temperature module, a humidity generation module, a multi-gas proportioning module, and a gas mixing and storage module;

[0041] The gas generation module is connected to the constant temperature module, the constant temperature module is used to heat the gas output by the gas generation module, the constant temperature module is connected to the humidity generation module and the multi-gas matching module, the humidity generation module is used to humidify the gas, and the gas mixing and storage module is connected to the multi-gas matching module, for mixing the humidified gas with the dry gas and storing the gas.

[0042] The first gas output unit stores SO2 gas and outputs it to the constant temperature module. The second gas output unit stores N2 gas and outputs it to the constant temperature module. A proportional valve and flow meter are also installed between the gas generation module and the constant temperature module. The proportional valve controls the ratio of gas output from the gas generation module to the constant temperature module, and the flow meter measures the flow rate of gas output from the gas generation module to the constant temperature module.

[0043] The multi-gas proportioning module includes a first mixing valve and a second mixing valve. One input end of the first mixing valve is connected to the constant temperature module, and the other input end is connected to the humidity generating module. One input end of the second mixing valve is connected to the first mixing valve, and the other input end is connected to the constant temperature module. The output end of the second mixing valve is connected to the storage module.

[0044] A constant temperature chamber is also provided, in which a constant temperature module, a humidity generating module, a multi-gas proportioning module and a gas mixing and storage module are all arranged; a temperature sensor is also provided in the constant temperature chamber.

[0045] A user operation module is also provided, connected to the proportional valve and flowmeter for parameter setting. The humidity generation module specifically comprises a humidification unit and a four-stage oil-water separation unit. The humidification unit and the four-stage oil-water separation unit are connected in series. The humidification unit produces water vapor and feeds it into the four-stage oil-water separation unit, which filters the liquid water and micro-water droplets to produce gaseous water vapor.

[0046] S1. Detecting stability performance: Set the preprocessor temperature to the target temperature and preheat to stabilize it. Place the temperature probe of the temperature and humidity inspection instrument at the same position as the smoke temperature probe of the preprocessor. After the temperature stabilizes, read a value every h time. Read n groups of values ​​and calculate the stability performance based on these n groups of values.

[0047] The calculation formula for stability performance is:

[0048] δ=T max -T min

[0049] Where, T max is the maximum temperature measurement, T min The minimum value of temperature measurement, in °C;

[0050] S2. Dehydration efficiency testing: Divide the experimental environment into three zones, set the temperature and relative humidity for each zone, and after the temperature and humidity of the experimental environment stabilize, obtain the temperature, humidity, and dew point of the experimental environment, calculate the moisture content as the initial value, obtain the temperature, humidity, and dew point of the gas discharged from the preprocessor, calculate the moisture content as the final value, and calculate the dehydration efficiency based on the initial and final values;

[0051] The calculation formula for dehydration efficiency is:

[0052]

[0053] Where η is the dehydration efficiency, η 初 is the initial value of moisture content, η 终 is the moisture content after the pre-processor;

[0054] S3. Detect SO2 component loss rate: dilute the standard gas, and after the mixed gas stabilizes, pass it into a flue gas analyzer that has withered and is in normal working condition, measure the initial concentration of each component in the mixed gas, and record the initial value of each component in the mixed gas. Pass the mixed gas into a fixed pollution source flue gas preprocessor. After it stabilizes, mix the gas at the outlet of the preprocessor and pass it into the flue gas analyzer that has withered and is in normal working condition again. After stabilization, record the results to obtain the final value. Calculate the conversion efficiency of the instrument under test based on the initial and final values;

[0055] When the initial concentration CSO 2初In the range of 50-250 μmol / mol and >250 μmol / mol:

[0056]

[0057] When the initial concentration In the range of 0-50 μmol / mol:

[0058]

[0059] Where, SO 2丢 is the loss rate, SO 2初 is the initial value, SO 2终 is the final value after the preprocessor.

[0060] Based on the settings in the user-operated module, sulfur dioxide and high-purity nitrogen pass through mass flow controllers and flow through a constant-temperature pipeline. Here, the gases are heated to a specific temperature and maintained constant. A portion of the high-purity nitrogen then passes through a humidity generator, releasing a mixture of high-purity nitrogen and water vapor. This mixture then passes through a mixing valve and sulfur dioxide for a secondary mixing process, ensuring the uniformity of the final target gas. The secondary mixed gas ultimately reaches the storage chamber for use by the flue gas preprocessor.

[0061] The calibration process of the flue gas preprocessor calibration device can be summarized as follows: the target temperature, humidity and sulfur dioxide concentration are set through the user operation module, and then the constant temperature module and the constant humidity module continuously supply temperature and humidity. High-purity nitrogen, sulfur dioxide and water vapor reach the mixing and storage module in a certain proportion through the mass flow controller, and the air in the cavity is evacuated until the cavity is filled with mixed gas and reaches dynamic equilibrium. After that, a dew point meter is used to measure the dew point temperature of the mixed gas, and a temperature and humidity patrol meter is used to measure the temperature and humidity of the mixed gas before and after entering the flue gas preprocessor, and the temperature fluctuation range and the dehumidification efficiency indication error are calculated; a flue gas analyzer is used to measure the sulfur dioxide concentration in the mixed gas before and after entering the flue gas preprocessor, and the sulfur dioxide loss rate is calculated.

[0062] The mixing chamber is a key component of this project. During the equipment construction phase, the project team initially discussed using the interior of the constant temperature module as the mixing chamber for sulfur dioxide, water vapor, and nitrogen. However, post-equipment testing revealed the following issues: 1. The constant temperature module's interior is large and not airtight, making it difficult to mix the sulfur dioxide. 2. During the mixing process, oxygen enters the constant temperature module. The combined presence of oxygen, water vapor, and sulfur dioxide could lead to a chemical reaction that produces sulfuric acid, which could further corrode equipment components. Therefore, the project team considered using a separate mixing chamber. Because sulfur dioxide is an acidic gas, the material for the separate mixing chamber needed to be resistant to acidic gas corrosion. Furthermore, the volume of the separate mixing chamber needed to be further determined. Too large a volume would result in prolonged mixing time, increased standard gas consumption, and increased costs; too small a volume could result in insufficient flow. After multiple tests, the project team ultimately resolved these issues and determined the appropriate material and size for the separate mixing chamber.

[0063] Sulfur dioxide is an acidic gas. In the presence of water droplets and sulfur dioxide, the two react to form sulfurous acid. If oxygen is also present, further chemical reactions occur to form sulfuric acid, causing irreversible damage to equipment components. Therefore, addressing the problem of sulfur dioxide dissolving in water during the gas distribution process became the primary challenge of this project. By selecting an independent mixing module, the project team eliminated the possibility of oxygen being present. Furthermore, they needed to address the issue of sulfurous acid being formed by the coexistence of sulfur dioxide and microscopic water droplets. Using a common humidifier during the gas distribution process would inevitably result in the presence of microscopic water droplets. This led to the question of selecting a humidity module. Conventional humidifiers were not an option. Simply humidifying the nitrogen through a gas scrubber would not allow for controlled humidity levels. Therefore, the project team designed a custom humidity module that connected a humidifier pump and a four-stage oil-water separator in series. The oil-water separator can effectively filter liquid water / micro water droplets. The filtered gas can be considered to be gaseous water vapor. Although gaseous water vapor will still react chemically with sulfur dioxide, the generated sulfurous acid is very unstable. In the absence of oxygen, it will quickly decompose into water vapor and sulfur dioxide. After a period of time, this process will form a dynamic equilibrium, which also ensures the accuracy of sulfur dioxide in the subsequent mixing chamber.

[0064] When the calibration device sets the SO2 concentration to 40.0 μmol / mol, the theoretical value of the gas distribution is calculated to be 39.9 μmol / mol based on the flow rate displayed by the distribution ratio. The standard value measured by the flue gas analyzer is 39.3 μmol / mol. Therefore, the water solubility of SO2 in the gas distribution process of this device is 1.5%.

[0065] 1. Standard instruments used in the test

[0066] Table 1 Test standards

[0067]

[0068] 2. Pilot Project

[0069] (1) Humidity uniformity and fluctuation in the mixing chamber

[0070] (2) Uniformity of SO2 gas concentration in the mixing chamber

[0071] (3) Stability of SO2 gas concentration in the mixing chamber

[0072] 3. Experimental plan, operation methods and data processing

[0073] Test 1: Set the temperature and humidity of the calibration device to 60°C and 65% RH (atmospheric pressure of 101.0 kPa, the humidity content is 14.8%, and the humidity content is calculated using the Vaisala Humidity Calculator, as shown in the following example: Figure 2 ), after the temperature and humidity in the mixing chamber of the device are stable, press the temperature and humidity sensor of the temperature and humidity inspection instrument Figure 3 The positions are placed at 1 / 3, 1 / 2, and 2 / 3 in the mixing chamber. The values ​​are read at each position within 30 minutes, and one value is recorded every 5 minutes to calculate the humidity uniformity and fluctuation in the chamber.

[0074] The test data is as follows:

[0075] Table 2 Humidity values ​​of sensor at position 1

[0076] time 5min 10min 15min 20min 25min 30min Volatility Value (%RH) 65.7 65.0 66.3 67.2 64.7 67.3 1.3

[0077] Table 3 Humidity values ​​of sensor at position 2

[0078] time 5min 10min 15min 20min 25min 30min Volatility Value (%RH) 66.2 67.5 68.1 64.5 65.1 64.0 2.1

[0079] Table 4 Humidity values ​​of sensor at position 3

[0080] time 5min 10min 15min 20min 25min 30min Volatility Value (%RH) 64.3 65.7 65.9 63.7 66.2 65.6 1.1

[0081] Humidity fluctuation is calculated according to formula (1):

[0082] H 波动度 =(H max -H min ) / 2·············(1)

[0083] Humidity uniformity is calculated according to formula (2):

[0084] H 均匀性=[(H max1 -H min1 )+(H max2 -H min2 )+(H max3 -H min3 )] / 3·······(2)

[0085] According to the above data and formula (2), the humidity uniformity is 2.9% RH.

[0086] From the above data, it can be seen that the uniformity and stability of the humidity in the mixing chamber of this device meet the requirements of the scientific research project contract indicators (humidity uniformity in the mixing chamber is <5.0%RH, and the fluctuation within 30 minutes is within ±3.0%RH).

[0087] Test 2: First, measure the error of the SO2 concentration indication of the calibration device. Set the temperature and humidity of the device to 60℃ and 65%RH, and the SO2 concentration to 40.0μmol / mol, 150.0μmol / mo, and 350.0μmol / mo, respectively. Figure 3 Place the tester in the middle 2 position and repeat the measurement for 3 times for each concentration. After the temperature, humidity and SO2 concentration values ​​are stable, start recording the values ​​and calculate the error of the SO2 concentration indication in the chamber. The test data are as follows:

[0088] Table 5 SO2 concentration indication error

[0089]

[0090]

[0091] The temperature and humidity of the calibration device were set to 60℃ and 65%RH, the SO2 concentration was set to 40.0μmol / mol, and the smoke gun probe of the flue gas analyzer was set to Figure 3 Place the tester at positions 1, 2, and 3, read the value at each position for 30 minutes, and record a value every 5 minutes. After the temperature, humidity, and SO2 concentration values ​​stabilize, start recording the values ​​and calculate the uniformity of the SO2 concentration value in the chamber. The test data is as follows:

[0092] Table 6 SO2 concentration values ​​at different locations when set to 40.0 μmol / mol

[0093]

[0094] The uniformity of SO2 concentration is calculated according to formula (3):

[0095] C 均匀性 =[(C max1 -C min1 )+(C max2-C min2 )+(C max3 -C min3 )] / 3·······(3)

[0096] According to the above data and formula (3), when the device is set to 40.0 μmol / mol, the SO2 concentration uniformity is 0.5 μmol / mol.

[0097] The temperature and humidity of the calibration device were set to 60℃ and 65%RH, the SO2 concentration was set to 150.0μmol / mol, and the smoke gun probe of the flue gas analyzer was set to Figure 3 Place the tester at positions 1, 2, and 3, read the value at each position for 30 minutes, and record a value every 5 minutes. After the temperature, humidity, and SO2 concentration values ​​stabilize, start recording the values ​​and calculate the uniformity of the SO2 concentration value in the chamber. The test data is as follows:

[0098] Table 7 SO2 concentration values ​​at different locations when set to 150.0 μmol / mol

[0099]

[0100] The uniformity of SO2 concentration is calculated according to formula (4):

[0101] C 均匀性 =[(C max1 -C min1 )+(C max2 -C min2 )+(C max3 -C min3 )] / C 设定值 ×100%···(4)

[0102] According to the above data and formula (4), when the device is set to 150.0 μmol / mol, the SO2 concentration uniformity is 1.1%.

[0103] The temperature and humidity of the calibration device were set to 60℃ and 65%RH, the SO2 concentration was set to 350.0μmol / mol, and the smoke gun probe of the flue gas analyzer was set to Figure 3 Place the tester at positions 1, 2, and 3, read the value at each position for 30 minutes, and record a value every 5 minutes. After the temperature, humidity, and SO2 concentration values ​​stabilize, start recording the values ​​and calculate the uniformity of the SO2 concentration value in the chamber. The test data is as follows:

[0104] Table 8 SO2 concentration values ​​at different locations when set to 350.0 μmol / mol

[0105]

[0106]

[0107] According to the above data and formula (4), when the device is set to 350.0 μmol / mol, the SO2 concentration uniformity is 0.7%.

[0108] From the above data, it can be seen that the uniformity of SO2 concentration in the mixing chamber of this device meets the requirements of the scientific research plan project task contract indicators ((1) sulfur dioxide concentration ≥ 250μmol / mol, uniformity ≤ 1%; (2) 50μmol / mol≤ sulfur dioxide concentration < 250μmol / mol, uniformity ≤ 1.5%; (3) sulfur dioxide concentration < 50μmol / mol, uniformity ≤ 1μmol / mol).

[0109] Test 3: Set the temperature and humidity of the calibration device to 60℃, 65%RH, and the SO2 concentration to 40.0μmol / mol. Press the smoke gun probe of the flue gas analyzer to Figure 3 Place it in the middle 2 position, read the value within 1 hour, record a value every 15 minutes, and start recording the value after the temperature, humidity and SO2 concentration values ​​are stable, and calculate the stability of the SO2 concentration value in the chamber. The test data is as follows:

[0110] Table 9 SO2 concentration values ​​when set to 40.0μmol / mol

[0111]

[0112] The stability of SO2 concentration is calculated according to formula (5):

[0113] C 稳定性 =C max -C min ·······(5)

[0114] According to the above data and formula (5), when the device is set to 40.0 μmol / mol, the SO2 concentration stability is 0.6 μmol / mol.

[0115] The temperature and humidity of the calibration device were set to 60℃ and 65%RH, the SO2 concentration was set to 150.0μmol / mol, and the smoke gun probe of the flue gas analyzer was pressed Figure 3 Place it in the middle 2 position, read the value within 1 hour, record a value every 15 minutes, and start recording the value after the temperature, humidity and SO2 concentration values ​​are stable, and calculate the stability of the SO2 concentration value in the chamber. The test data is as follows:

[0116] Table 10 SO2 concentration values ​​when set to 150.0μmol / mol

[0117]

[0118] The stability of SO2 concentration is calculated according to formula (6):

[0119] C 稳定性 =(C max -C min ) / C 平均值 ·······(6)

[0120] According to the above data and formula (6), when the device is set to 150.0 μmol / mol, the SO2 concentration stability is 1.5%.

[0121] The temperature and humidity of the calibration device were set to 60℃ and 65%RH, the SO2 concentration was set to 350.0μmol / mol, and the smoke gun probe of the flue gas analyzer was pressed Figure 3 Place it in the middle 2 position, read the value within 1 hour, record a value every 15 minutes, and start recording the value after the temperature, humidity and SO2 concentration values ​​are stable, and calculate the stability of the SO2 concentration value in the chamber. The test data is as follows:

[0122] Table 11 SO2 concentration values ​​when set to 350.0μmol / mol

[0123]

[0124] According to the above data and formula (6), when the device is set to 350.0 μmol / mol, the SO2 concentration stability is 0.9%.

[0125] From the above data, it can be seen that the stability of SO2 concentration in the mixing chamber of this device meets the requirements of the scientific research plan project task contract indicators ((1) sulfur dioxide concentration ≥ 250μmol / mol, stability ≤ 1.5%; (2) 50μmol / mol≤ sulfur dioxide concentration < 250μmol / mol, stability ≤ 3%; (3) sulfur dioxide concentration < 50μmol / mol, stability ≤ 1.5μmol / mol)).

[0126] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0127] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A detection and calibration device for a flue gas preprocessor of a fixed pollution source, characterized in that: include: Gas generation module, constant temperature module, humidity generation module, multi-gas proportioning module, gas mixing and storage module; The gas generation module is connected to a constant temperature module, which is used to heat the gas output by the gas generation module. The constant temperature module is connected to the humidity generation module and the multi-gas matching module, which is used to humidify the gas. The gas mixing and storage module is connected to the multi-gas matching module, which is used to mix the humidified gas with the dry gas and store the gas.

2. A detection and calibration device for a stationary pollution source flue gas pre-processor according to claim 1, characterized in that: The gas generating module includes a first gas output unit and a second gas output unit; The first gas output unit is used to store SO2 gas and output it to the constant temperature module, and the second gas output unit is used to store N2 gas and output it to the constant temperature module.

3. The detection and calibration device for a stationary pollution source flue gas pre-processor according to claim 1, characterized in that: A proportional valve and a flow meter are also installed between the gas generation module and the constant temperature module. The proportional valve is used to control the proportion of gas output from the gas generation module to the constant temperature module, and the flow meter is used to measure the flow rate of gas output from the gas generation module to the constant temperature module.

4. The detection and calibration device for a stationary pollution source flue gas pre-processor according to claim 1, characterized in that: The multi-gas proportioning module includes a first mixing valve and a second mixing valve, one input end of the first mixing valve is connected to the constant temperature module, and the other input end is connected to the humidity generating module, one input end of the second mixing valve is connected to the first mixing valve, and the other input end is connected to the constant temperature module, and the output end of the second mixing valve is connected to the storage module.

5. The detection and calibration device for a stationary pollution source flue gas pre-processor according to claim 1, characterized in that: A constant temperature chamber is also provided, in which the constant temperature module, humidity generating module, multi-element gas proportioning module, and gas mixing and storage module are all provided; A temperature sensor is also provided in the constant temperature chamber.

6. The detection and calibration device for a stationary pollution source flue gas pre-processor according to claim 3, characterized in that: A user operation module is also provided, which is connected to the proportional valve and the flow meter and is used for setting parameter values.

7. The detection and calibration device for a stationary pollution source flue gas pre-processor according to claim 1, characterized in that: The humidity generating module specifically comprises a humidifying unit and a four-stage oil-water separation unit. The humidifying unit is connected in series with the four-stage oil-water separation unit. The humidifying unit produces water vapor and inputs it into the four-stage oil-water separation unit. The four-stage oil-water separation unit filters liquid water and micro water droplets to obtain gaseous water vapor.

8. A method for detecting and calibrating a flue gas preprocessor for a stationary pollution source, applicable to any one of the detection and calibration devices for a flue gas preprocessor for a stationary pollution source according to claims 1-7, characterized in that: The following steps are involved: S1. Detecting stability performance: Set the preprocessor temperature to the target temperature and preheat to stabilize it. Place the temperature probe of the temperature and humidity inspection instrument at the same position as the smoke temperature probe of the preprocessor. After the temperature stabilizes, read a value every h time. Read n groups of values ​​and calculate the stability performance based on these n groups of values. S2. Dehydration efficiency testing: Divide the experimental environment into three zones, set the temperature and relative humidity for each zone, and after the temperature and humidity of the experimental environment stabilize, obtain the temperature, humidity, and dew point of the experimental environment, calculate the moisture content as the initial value, obtain the temperature, humidity, and dew point of the gas discharged from the preprocessor, calculate the moisture content as the final value, and calculate the dehydration efficiency based on the initial and final values; S3. Detect the loss rate of SO2 components: dilute the standard gas, and after the mixed gas stabilizes, pass it into a flue gas analyzer that has withered and is in normal working condition, measure the initial concentration of each component in the mixed gas, and record the initial value of each component in the mixed gas. Pass the mixed gas into a fixed pollution source flue gas preprocessor, and after it stabilizes, mix the gas at the outlet of the preprocessor and pass it into the flue gas analyzer that has withered and is in normal working condition again. After stabilization, record the results to obtain the final value, and calculate the conversion efficiency of the instrument to be tested based on the initial and final values.

9. A method for detecting and calibrating a stationary pollution source flue gas pre-processor according to claim 8, characterized in that: The calculation formula for stability performance is: δ=T max -T min Where, T max is the maximum temperature measurement, T min The minimum value of temperature measurement, in °C; The calculation formula for dehydration efficiency is: Where η is the dehydration efficiency, η 初 is the initial value of moisture content, η 终 It is the moisture content after the pre-processor.

10. A method for detecting and calibrating a stationary pollution source flue gas pre-processor according to claim 8, characterized in that: The calculation formula for SO2 component loss rate is: When the initial concentration In the range of 50-250 μmol / mol and >250 μmol / mol: When the initial concentration In the range of 0-50 μmol / mol: Where, SO 2丢 is the loss rate, SO 2初 is the initial value, SO 2终 is the final value after the preprocessor.

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