CN113654853B - SO suitable for high-humidity flue gas 3 Partitioned classified sampling device and sampling method - Google Patents
SO suitable for high-humidity flue gas 3 Partitioned classified sampling device and sampling method Download PDFInfo
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- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
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- G01N1/2258—Sampling from a flowing stream of gas in a stack or chimney
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- G01N1/40—Concentrating samples
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- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
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- G01N2001/225—Sampling from a flowing stream of gas isokinetic, same flow rate for sample and bulk gas
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- G01N1/00—Sampling; Preparing specimens for investigation
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- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/2247—Sampling from a flowing stream of gas
- G01N1/2258—Sampling from a flowing stream of gas in a stack or chimney
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Abstract
Suitable for high-humidity flue gasSO 3 A sampling inlet is connected with an air inlet of a primary filter through a pipeline, a heat tracing device is arranged outside a pipeline communicated with the sampling inlet and a primary filter body, an air outlet of the primary filter is connected with an air inlet of a spiral condenser pipe through a pipeline, an air outlet of the spiral condenser pipe is connected with an air inlet of a condensate collecting bottle through a pipeline, an air outlet of the condensate collecting bottle is connected with an air inlet of a dry type impact bottle through a pipeline, the pipeline extends to the bottom of the dry type impact bottle, an air outlet of the dry type impact bottle is connected with an air inlet of a high-efficiency filter through a pipeline, a polytetrafluoroethylene membrane is arranged in the high-efficiency filter, an air outlet of the high-efficiency filter is connected with an air pump, a sampling controller is arranged on the pipeline connected with the high-efficiency filter and the air pump, and the condensate collecting bottle and the body of the dry type impact bottle are immersed in a water bath device 3 And liquid SO 3 Classified sampling is carried out, and SO is improved 3 The sampling accuracy of (2).
Description
Technical Field
The invention relates to SO of high-humidity flue gas 3 The detection system is particularly suitable for SO of high-humidity flue gas 3 A subarea classification sampling device and a sampling method, belonging to SO of high-humidity flue gas 3 The field of detection technology.
Background
SO in flue gas 3 Mainly from combustion of sulfur-containing substances and SO 2 High temperature oxidation and catalytic oxidation. SO (SO) 3 Is a common atmospheric pollutant, has strong harm to production equipment and atmospheric environment, and is SO for the production equipment 3 And sulfate formed by the sulfate can cause corrosion and blockage on the sulfate, and the normal production is influenced; for atmospheric conditions, SO 3 The induced acid rain can corrode buildings, cause soil acidification and pollute rivers and lakes, and form sulfuric acid mist aerosol in the atmosphere to aggravate dust haze and acid sedimentation pollution; for human health, SO 3 The composite material has strong irritation to human mucosa and respiratory system, is one of important precursors of fine particle pollutants, and has potential harm to human body. Therefore, the SO in the flue gas is known 3 The content of (A) and then the emission of (B) are controlled, SO that the method has very important environmental protection significance, and convenient and reliable SO is mastered 3 Sampling testing methodLaw, is a necessary prerequisite to achieve this goal.
SO for industrial emissions 3 Currently, the main sampling methods are the controlled condensation method (GB/T21508-2008, DL/T1990-2019) and the isopropanol absorption method (U.S. EPAMethod8). The controlled condensation method is to firstly remove SO in the flue gas 3 Condensing in a spiral tube, and washing and collecting with water or isopropanol solution; the isopropanol absorption law is that the flue gas is introduced into 80% isopropanol in an ice water bath to directly absorb SO in the flue gas 3 . In the method, SO in the original flue gas is reversely deduced by detecting the sulfate radical content in the liquid sample 3 Concentration of H present in the flue gas in gas/liquid state 2 SO 4 With true SO 3 In one conversation, the SO measured 3 The concentration is the mixture concentration of the substances and can not react with SO in the flue gas 3 The true concentration of (A) cannot distinguish between SO in different forms 3 . In SO 3 In the related research, the gaseous SO is often examined 3 And liquid SO 3 The mutual conversion process and the proportional relation between the SO and the SO are necessary 3 And the change forms of the parameters are subjected to subarea classification sampling measurement. SO in flue gas 3 Initially existing in a gaseous state, but in a complex flue gas environment, gaseous H can be formed under the influence of factors such as water vapor and temperature change 2 SO 4 Liquid H 2 SO 4 (sulfuric acid fog drop) and the like, and in addition, when the humidity of the flue gas is high, a large amount of liquid water can be separated out in the condensation control process, so that the condenser pipe is overflowed, and normal sampling is influenced; especially when SO is in flue gas 3 When the concentration is lower, long-time sampling is needed to ensure that the concentration of sulfate radicals in the sample reaches the detection limit, more water is analyzed at the moment, the sampling is interrupted or failed, and SO is reduced 3 The sampling accuracy of (2).
Disclosure of Invention
The invention aims to provide SO suitable for high-humidity flue gas 3 The sampling device and the sampling method for classifying by regions have simple structure and convenient operation, and can be used for sampling gaseous SO in flue gas 3 And liquid SO 3 Classified sampling is carried out, and SO 3 The sampling accuracy of (2).
In order to achieve the aim, the invention provides SO suitable for high-humidity flue gas 3 The sampling inlet is connected with an air inlet of a primary filter through a pipeline, a heat tracing device is arranged outside a pipeline communicated with the primary filter body, an air outlet of the primary filter is connected with an air inlet of a spiral condensation pipe through a pipeline, an air outlet of the spiral condensation pipe is connected with an air inlet of a condensate collecting bottle through a pipeline, an air outlet of the condensate collecting bottle is connected with an air inlet of a dry type impact bottle through a pipeline, the pipeline extends to the bottom position of the dry type impact bottle, an air outlet of the dry type impact bottle is connected with an air inlet of a high-efficiency filter through a pipeline, a polytetrafluoroethylene film is arranged in the high-efficiency filter, an air outlet of the high-efficiency filter is connected with an air pump, a sampling controller is arranged on a pipeline connected with the air pump of the high-efficiency filter, the condensate collecting bottle and a bottle body of the dry type impact bottle are immersed in a water bath device, a circulating water pump arranged in the water bath device is communicated with a water inlet of the spiral condensation pipe, constant temperature water in the water bath device is pumped into the spiral condensation pipe through the circulating water pump, heat exchange is carried out between the constant temperature water in the spiral condensation pipe and flue gas in the spiral condensation pipe, and then the water bath device, and the temperature of the water bath device is controlled to be kept consistent with the temperature of the water bath device.
Preferably, a quartz filter membrane is arranged in the primary filter, so that solid and liquid impurities in the flue gas can be filtered.
Preferably, the length of spiral condenser pipe is greater than 350mm, and spiral condenser pipe is two-layer inside and outside, and the inlayer sets up to flue gas channel, and the skin sets up to the cover water layer, and the flue gas is walked to the inlayer, and the skin is the cover water layer, and the water in the water layer is derived from circulating water pump, and its temperature is less than flue gas initial temperature, can reduce the flue gas to the assigned temperature.
Preferably, the volume of the condensate collecting bottle is more than or equal to 1L, and the condensate collecting bottle is used for collecting and controlling a large amount of liquid water and part of condensed acid mist separated out in the condensation process, so that condensed water is prevented from entering a follow-up device.
Preferably, the bottle height of the dry impact bottle is between 20 and 30cm, and the dry impact bottle and the high-efficiency filter are used for collecting small-particle-size acid mist drops which pass through the spiral condensation pipe and the condensate collecting bottle due to undersize particle size.
Preferably, the pore size of the polytetrafluoroethylene membrane is 0.3um or less.
Preferably, the sampling control comprises a thermometer, a pressure gauge and a flowmeter, the thermometer, the pressure gauge and the flowmeter are respectively used for detecting the smoke temperature, the smoke humidity, the sampling pressure and the sampling flow, and the sampling controller is used for assisting in controlling the sampling speed.
SO suitable for high-humidity flue gas 3 The partition classification sampling method comprises two times of sampling, and comprises the following specific steps:
constant-speed sampling for the first time:
(1) a quartz filter membrane is arranged in the first-stage filter, a polytetrafluoroethylene membrane is arranged in the high-efficiency filter, a pipeline is connected, and the tightness of the device is checked;
(2) placing a sampling inlet in the flue and facing away from the flowing direction of the flue gas, and starting a heat tracing device and a water bath device to heat the system to a preset temperature; if the temperature of the flue gas is lower than 130 ℃, the set temperature of the heat tracing device is 130 ℃; if the temperature of the flue gas is higher than 130 ℃, the set temperature of the heat tracing device is the same as the temperature of the flue gas; setting the temperature of the water bath device to 65 ℃;
(3) rotating the sampling inlet to enable the sampling inlet to be opposite to the flowing direction of the flue gas, starting an air suction pump for sampling, and controlling the flow and the time length of the flue gas sampling through a sampling controller;
(4) after sampling is finished, sequentially flushing a pipeline between the primary filter and the spiral condenser pipe, a condensate collecting bottle and a dry type impact bottle by using an isopropanol solution with the volume fraction of 80 percent to remove SO on a polytetrafluoroethylene membrane in the high-efficiency filter 3 Carrying out ultrasonic extraction, and mixing the flushing solution and the extraction solution to obtain a sample 1;
and (3) constant-speed sampling for the second time:
(5) removing the quartz filter membrane in the primary filter, filling a new quartz filter membrane, filling a new polytetrafluoroethylene membrane in the high-efficiency filter, connecting a pipeline, and checking the tightness of the device;
(6) placing a sampling inlet in the flue and back to the flow direction of the flue gas, starting a heat tracing device and a water bath device, setting the temperature of the heat tracing device to be 350 ℃ and the temperature of the water bath device to be 65 ℃, and repeating the steps (3) and (4) to obtain a sample 2;
(7) measuring the content of sulfate ions in the sample 1 and the sample 2, and respectively obtaining SO in the primary sampled flue gas by combining with the sampling flow calculation 3 Standard condition mass concentration C of 1 And sampling SO in the original flue gas for the second time 3 Standard condition mass concentration C of 2 ，C 1 、C 2 In mg/Nm 3 (ii) a The calculation formula is as follows:
in the formula: rho 1 、ρ 2 Respectively measuring the concentration of sulfate radicals in a unit of mol/L in a liquid sample 1 and a liquid sample 2;
V 1 the total volume of the mixed sample of the flushing liquid and the extraction liquid in the first sampling is L;
V 2 the total volume of the mixed sample of the flushing liquid and the extraction liquid in the second sampling is L;
80.86 is SO 3 The molar mass of (a) is in g/mol;
V nd converted into the total volume of the sampled smoke in the standard state, in Nm 3 ，V nd Calculated by the following formula:
in the formula: v d The sampling volume of dry flue gas is m under actual working condition 3 ；
B a Is local atmospheric pressure in Pa;
P r before the flow meterFlue gas pressure, unit Pa;
T r is the flue gas temperature before the flowmeter, unit ℃;
(8) respectively obtaining gaseous SO in the original flue gas by calculation 3 Concentration C of gases ＝C 1 And liquid SO 3 Concentration C of drops ＝C 2 -C 1 。
Compared with the prior art, the sampling device has the advantages that the sampling inlet, the primary filter, the spiral condenser pipe, the condensate collecting bottle, the dry type impact bottle, the high-efficiency filter, the sampling controller and the air pump are sequentially connected through the sampling pipeline; the method for controlling condensation and structural gas-liquid separation is adopted to realize SO in high-humidity flue gas 3 The purpose of sampling by partition classification is realized, and the SO is improved 3 The precision of the detection; according to the invention, a condensate collecting bottle is used for collecting and controlling a large amount of liquid water and part of condensed acid mist separated out in the condensation process, so that condensed water is prevented from entering a subsequent device; the dry impact bottle and the high-efficiency filter are used for collecting small-particle-size acid mist drops which pass through the spiral condensation pipe and the condensate collecting bottle due to undersize particle size, SO that the SO content is improved 3 The sampling accuracy of (2).
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
In the figure: 1. the device comprises a sampling inlet, 2 a primary filter, 3 a heat tracing device, 4 a spiral condenser pipe, 5 a water bath device, 6 a circulating water pump, 7 a condensate collecting bottle, 8 a dry impact bottle, 9 a high-efficiency filter, 10 a sampling controller, 11 and an air pump.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
As shown in figure 1, SO suitable for high-humidity flue gas 3 Categorised sampling device of subregion, sampling import 1 passes through the air inlet of tube coupling primary filter 2, the direction of sampling import 1 can be adjusted, can be applicable to different flue gas pipeline, sampling import 1 sets up heat tracing device 3 with the pipeline of 2 body intercommunications of primary filter, the air inlet of tube coupling spiral condenser pipe 4 is passed through to the gas outlet of primary filter 2, the gas outlet of spiral condenser pipe 4 is through the gas outlet of tube coupling spiral condenser pipe 4The air inlet of tube coupling condensate receiving flask 7, the air inlet of tube coupling dry-type impact bottle 8 is passed through to the gas outlet of condensate receiving flask 7, and the pipeline extends to the bottom position of dry-type impact bottle 8, the air inlet of tube coupling high efficiency filter 9 is passed through to the gas outlet of dry-type impact bottle 8, high efficiency filter 9 embeds the polytetrafluoroethylene membrane, aspiration pump 11 is connected to high efficiency filter 9's gas outlet, set up sampling controller 10 on the pipeline that high efficiency filter 9 and aspiration pump 11 are connected, condensate receiving flask 7, the body submergence of dry-type impact bottle 8 is in water bath device 5, circulating water pump 6 that sets up in water bath device 5 and the water inlet of spiral condenser pipe 4 communicate, pump the thermostatted water in water bath device 5 into spiral condenser pipe 4 through circulating water pump 6, the thermostatted water in spiral condenser pipe 4 carries out the heat transfer with the flue gas in the spiral condenser pipe 4 after entering into water bath device 5 by the delivery port of spiral condenser pipe 4, thereby control the temperature of flue gas keeps unanimous with the temperature of water bath device 5, the length of spiral condenser pipe 4 is greater than 350mm, spiral condenser pipe 4 divides the water layer into the water layer, set up to the outer layer, the outer layer is set up to the outer layer, the flue gas temperature is lower than the initial temperature of circulating water layer, the flue gas temperature of the outer layer, it is lower than the water layer.
A quartz filtering membrane is arranged in the primary filter 2, so that solid and liquid impurities in the flue gas can be filtered.
The volume of the condensate collecting bottle 7 is more than or equal to 1L, and the condensate collecting bottle 7 is used for collecting and controlling a large amount of liquid water and part of condensed acid mist separated out in the condensation process, so that condensed water is prevented from entering a follow-up device.
The bottle height of the dry impact bottle 8 is between 20 and 30cm, and the dry impact bottle 8 and the high-efficiency filter 9 are used for collecting small-particle-size acid mist drops which pass through the spiral condensation pipe 4 and the condensate collecting bottle 7 due to undersize particle sizes.
The pore diameter of the polytetrafluoroethylene membrane is less than or equal to 0.3um.
The sampling controller 10 comprises a thermometer, a pressure gauge and a flowmeter, which are respectively used for detecting the temperature of the flue gas, the humidity of the flue gas, the sampling pressure and the sampling flow, and the sampling controller 10 assists in controlling the sampling speed.
SO suitable for high-humidity flue gas 3 The partition classification sampling method comprises two times of sampling, and comprises the following specific steps:
constant-speed sampling for the first time:
(1) a quartz filtering membrane is arranged in the first-stage filter 2, a polytetrafluoroethylene membrane is arranged in the high-efficiency filter 9, a pipeline is connected, and the tightness of the device is checked;
(2) placing the sampling inlet 1 in a flue and facing away from the flowing direction of flue gas, and starting the heat tracing device 3 and the water bath device 5 to heat the system to a preset temperature; if the temperature of the flue gas is lower than 130 ℃, the set temperature of the heat tracing device 3 is 130 ℃; if the temperature of the flue gas is higher than 130 ℃, the set temperature of the heat tracing device 3 is the same as the temperature of the flue gas; the temperature of the water bath device 5 is set to be 65 ℃;
(3) rotating the sampling inlet 1 to enable the sampling inlet to be opposite to the flowing direction of the flue gas, starting an air suction pump 11 for sampling, and controlling the flow and the time length of the flue gas sampling through a sampling controller 10;
(4) after sampling is finished, a pipeline between the primary filter 2 and the spiral condenser pipe 4, the condensate collecting bottle 7 and the dry type impact bottle 8 are sequentially washed by an isopropanol solution with the volume fraction of 80%, and SO on a polytetrafluoroethylene membrane in the high-efficiency filter 9 is treated 3 Carrying out ultrasonic extraction, and mixing the flushing solution and the extraction solution to obtain a sample 1;
and (3) sampling at constant speed for the second time:
(5) removing the quartz filtering membrane in the primary filter 2, filling a new quartz filtering membrane, filling a new polytetrafluoroethylene membrane in the high-efficiency filter 9, connecting a pipeline, and checking the tightness of the device;
(6) placing the sampling inlet 1 in a flue and facing away from the flowing direction of flue gas, starting the heat tracing device 3 and the water bath device 5, setting the temperature of the heat tracing device 3 to be 350 ℃ and the temperature of the water bath device 5 to be 65 ℃, and repeating the steps (3) and (4) to obtain a sample 2;
(7) measuring the sulfate ion content in the sample 1 and the sample 2, and respectively obtaining SO in the primary flue gas sampled for the first time by combining with the sampling flow calculation 3 Standard condition mass concentration C 1 And sampling SO in the original flue gas for the second time 3 Standard condition mass concentration C of 2 ，C 1 、C 2 In mg/Nm 3 (ii) a The calculation formula is as follows:
in the formula: rho 1 、ρ 2 Respectively measuring the concentration of sulfate radical in a liquid sample 1 and a liquid sample 2, wherein the unit is mol/L;
V 1 the total volume of the mixed sample of the flushing liquid and the extraction liquid in the first sampling is L;
V 2 the total volume of the mixed sample of the flushing liquid and the extraction liquid in the second sampling is L;
80.86 is SO 3 The unit of the molar mass of (a) is g/mol;
V nd converted into the total volume of the sampled smoke in the standard state in Nm 3 ，V nd Calculated by the following formula:
in the formula: v d The sampling volume of dry flue gas is m under actual working condition 3 ；
B a Is local atmospheric pressure in Pa;
P r the flue gas pressure before the flowmeter is in Pa;
T r is the flue gas temperature before the flowmeter, unit ℃;
(8) respectively obtaining gaseous SO in the original flue gas by calculation 3 Concentration C of gases ＝C 1 And liquid SO 3 Concentration C of drops ＝C 2 -C 1 。
When sampling for the first time, if the temperature of the flue gas is lower than 130 ℃, the temperature of the heat tracing device 3 is 130 ℃; if the temperature of the flue gas is higher than 130 ℃, the temperature of the heat tracing device 3 is the same as the temperature of the flue gas; the temperature of the heat tracing device 3 during the second sampling is 350 ℃; the temperature of the water bath device should be controlled to 65 ℃.
The embodiment is as follows:
the invention is utilized to clean SO in flue gas after wet desulphurization of a power plant 3 Carrying out sectional classified sampling detection on the concentration, respectively carrying out three times of parallel sampling on the first sampling and the second sampling, setting the sampling flow to be 20L/min, and the single sampling time to be 50min, after sampling, fixing the volume of a mixed sample of flushing liquid and extract liquid to be 0.25L, and setting other parameters as described above, wherein the sampling result is shown in table 1;
TABLE 1-SO 3 Sampling table for partition classification
As shown in Table 1, the average concentration ρ of sulfate groups in the first sample liquid sample was detected 1 Is 1.23X 10 -5 mol/L, average concentration of sulfate radical in the second liquid sample ρ 2 Is 7.08X 10 -5 mol/L, SO the SO in the original flue gas is obtained by the first sampling 3 Has an average standard condition mass concentration of 0.344mg/Nm 3 The second sampling obtains SO in the original flue gas 3 Has an average standard condition mass concentration of 1.826mg/Nm 3 . The calculation shows that the gaseous SO in the wet desulphurization clean flue gas of the power plant 3 And liquid SO 3 Respectively at a concentration of 0.34mg/Nm 3 And 1.482mg/Nm 3 。
Claims (7)
1. SO suitable for high-humidity flue gas 3 The sampling method of the subarea classification sampling device is characterized in that a sampling inlet (1) of the sampling device is connected with an air inlet of a primary filter (2) through a pipeline, a heat tracing device (3) is arranged outside the pipeline for communicating the sampling inlet (1) with the primary filter (2), an air outlet of the primary filter (2) is connected with an air inlet of a spiral condensing pipe (4) through a pipeline, and an air outlet of the spiral condensing pipe (4) is connected with an air inlet of the spiral condensing pipe (4) through a pipelineThe device comprises an air inlet of a condensate collecting bottle (7), an air outlet of the condensate collecting bottle (7) is connected with an air inlet of a dry type impact bottle (8) through a pipeline, the pipeline extends to the bottom position of the dry type impact bottle (8), an air outlet of the dry type impact bottle (8) is connected with an air inlet of a high-efficiency filter (9) through a pipeline, a polytetrafluoroethylene membrane is arranged in the high-efficiency filter (9), an air outlet of the high-efficiency filter (9) is connected with an air suction pump (11), a sampling controller (10) is arranged on the pipeline connecting the high-efficiency filter (9) and the air suction pump (11), the condensate collecting bottle (7) and a bottle body of the dry type impact bottle (8) are immersed in a water bath device (5), a circulating water pump (6) arranged in the water bath device (5) is communicated with an water inlet of a spiral condensation pipe (4), constant-temperature water in the water bath device (5) is pumped into the spiral condensation pipe (4) through the circulating water pump (6), and the constant-temperature water in the spiral condensation pipe (4) exchanges heat with flue gas in the spiral condensation pipe (4) and then enters the water bath device (5) to control the temperature of the water bath device to be consistent with the flue gas temperature of the flue gas;
the sampling method of the sampling device comprises two times of sampling, and comprises the following specific steps:
constant-speed sampling for the first time:
(1) a quartz filtering membrane is arranged in the first-stage filter (2), a polytetrafluoroethylene membrane is arranged in the high-efficiency filter (9), a pipeline is connected, and the tightness of the device is checked;
(2) placing the sampling inlet (1) in a flue and facing back to the flow direction of flue gas, and starting the heat tracing device (3) and the water bath device (5) to heat the system to a preset temperature; if the temperature of the flue gas is lower than 130 ℃, the set temperature of the heat tracing device (3) is 130 ℃; if the temperature of the flue gas is higher than 130 ℃, the set temperature of the heat tracing device (3) is the same as the temperature of the flue gas; the temperature of the water bath device (5) is set to 65 ℃;
(3) rotating the sampling inlet (1) to just face the flow direction of the flue gas, starting an air extraction pump (11) for sampling, and controlling the flow and the duration of the flue gas sampling through a sampling controller (10);
(4) after sampling is finished, isopropanol solution with volume fraction of 80% is used for sequentially flushing a pipeline between the primary filter (2) and the spiral condensing tube (4), the condensate collecting bottle (7) and the dry type impact bottle (8), and high efficiency is achievedSO on the PTFE membrane in the filter (9) 3 Carrying out ultrasonic extraction, and mixing the flushing solution and the extraction solution to obtain a sample 1;
and (3) sampling at constant speed for the second time:
(5) removing the quartz filtering membrane in the primary filter (2), filling a new quartz filtering membrane, filling a new polytetrafluoroethylene membrane in the high-efficiency filter (9), connecting a pipeline, and checking the tightness of the device;
(6) placing the sampling inlet (1) in a flue and back to the flow direction of flue gas, starting the heat tracing device (3) and the water bath device (5), setting the temperature of the heat tracing device (3) to be 350 ℃ and the temperature of the water bath device (5) to be 65 ℃, and repeating the steps (3) and (4) to obtain a sample 2;
(7) measuring the content of sulfate ions in the sample 1 and the sample 2, and respectively obtaining SO in the primary sampled flue gas by combining with the sampling flow calculation 3 Standard condition mass concentration C of 1 And sampling SO in the original flue gas for the second time 3 Standard condition mass concentration C of 2 ，C 1 、C 2 In mg/Nm 3 (ii) a The calculation formula is as follows:
in the formula: ρ is a unit of a gradient 1 、ρ 2 Respectively measuring the concentration of sulfate radicals in a unit of mol/L in a liquid sample 1 and a liquid sample 2;
V 1 the total volume of the mixed sample of the flushing liquid and the extraction liquid in the first sampling is L;
V 2 the total volume of the mixed sample of the flushing liquid and the extraction liquid in the second sampling is L;
80.86 is SO 3 The molar mass of (a) is in g/mol;
V nd for conversion into total volume of sampled flue gas in standard stateBit Nm 3 ，V nd Calculated by the following formula:
in the formula: v d The sampling volume of dry flue gas is m under actual working condition 3 ；
B a Is local atmospheric pressure in Pa;
P r the flue gas pressure before the flowmeter is in Pa;
T r is the flue gas temperature before the flowmeter, unit ℃;
(8) respectively obtaining gaseous SO in the original flue gas by calculation 3 Concentration C of gases ＝C 1 And liquid SO 3 Concentration C of drops ＝C 2 -C 1 。
2. SO suitable for high-humidity flue gas according to claim 1 3 The sampling method of the subarea classification sampling device is characterized in that a quartz filtering membrane is arranged in a primary filter (2).
3. SO suitable for high-humidity flue gas according to claim 2 3 The sampling method of the subarea classification sampling device is characterized in that the length of the spiral condensing pipe (4) is more than 350mm, the spiral condensing pipe (4) is divided into an inner layer and an outer layer, the inner layer is a flue gas channel, and the outer layer is a jacket water layer.
4. SO suitable for high humidity flue gas according to claim 2 or 3 3 The sampling method of the subarea classification sampling device is characterized in that the volume of the condensate collecting bottle (7) is more than or equal to 1L.
5. SO suitable for high-humidity flue gas according to claim 2 or 3 3 The sampling method of the subarea classification sampling device is characterized in that the bottle height of the dry impact bottle (8) is between 20 and 30 cm.
6. SO suitable for high-humidity flue gas according to claim 2 or 3 3 The sampling method of the subarea classification sampling device is characterized in that the aperture of the polytetrafluoroethylene membrane is less than or equal to 0.3um.
7. SO suitable for high-humidity flue gas according to claim 2 or 3 3 The sampling method of the subarea classification sampling device is characterized in that the sampling controller (10) comprises a thermometer, a pressure gauge and a flowmeter, the thermometer, the pressure gauge and the flowmeter are respectively used for detecting the flue gas temperature, the flue gas humidity, the sampling pressure and the sampling flow, and the sampling controller (10) is used for assisting in controlling the sampling speed.
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| JPH08210954A (en) * | 1994-09-28 | 1996-08-20 | Nisshin Steel Co Ltd | Method and device for collecting so3 gas in exhaust gas, and method and device for analyzing so3 concentration |
| CN107843464A (en) * | 2017-12-01 | 2018-03-27 | 西安交通大学 | The SO of rotatory sealing multichannel3And H2SO4Sampling detector for multifunctional and method |
| CN109959538B (en) * | 2017-12-22 | 2021-11-16 | 上海明华电力科技有限公司 | Device and method for testing sulfur trioxide and condensable particles emitted by fixed pollution source |
| CN108871877B (en) * | 2018-04-03 | 2021-08-10 | 南京师范大学 | Device for collecting condensable particles through multistage temperature control |
| CN208818550U (en) * | 2018-10-11 | 2019-05-03 | 合肥学院 | It may be inhaled the sampling apparatus of particle and gas phase organic matter in a kind of acquisition flue gas |
| CN110398398A (en) * | 2019-07-10 | 2019-11-01 | 东南大学 | A kind of the classification sampling system and method for the emission intensity suitable for high-humidity gas fume |
| CN110806339A (en) * | 2019-11-18 | 2020-02-18 | 国电南京电力试验研究有限公司 | SO in flue gas of thermal power plant3Sampling method |
| CN111239327A (en) * | 2020-02-25 | 2020-06-05 | 宁夏恒承电力技术有限公司 | SO (SO)3Concentration testing method and device thereof |
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