CN215866401U - Quick-response online continuous sulfur trioxide measurement system - Google Patents
Quick-response online continuous sulfur trioxide measurement system Download PDFInfo
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- CN215866401U CN215866401U CN202121825654.XU CN202121825654U CN215866401U CN 215866401 U CN215866401 U CN 215866401U CN 202121825654 U CN202121825654 U CN 202121825654U CN 215866401 U CN215866401 U CN 215866401U
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Abstract
The utility model relates to a quick-response online continuous sulfur trioxide measuring system, which comprises a sampling measuring unit and a control system connected with the sampling measuring unit; the sampling measurement unit comprises a multi-channel sampling gun, a flue gas acquisition device and a flushing device which are respectively connected with each channel of the multi-channel sampling gun in a one-to-one correspondence manner, and a common sulfate ion measurement device; the flue gas collecting device comprises serpentine condenser pipes connected to the outlets of all channels of the multichannel sampling gun, and a gas-liquid separator, a gas flowmeter and a gas pump which are sequentially connected to the outlets of all the serpentine condenser pipes through a first outlet of a three-way electromagnetic valve; the flushing device comprises flushing liquid storage tanks which are correspondingly connected with inlets of the snakelike condensation pipes through independent flushing pipelines respectively; the sulfate ion measuring device comprises a collecting liquid storage tank connected with a second outlet of the three-way electromagnetic valve, a reaction bed connected with the outlet of the collecting liquid storage tank and a photoelectric signal detection system; the input end of the reaction bed is also connected with a standard liquid storage tank.
Description
Technical Field
The utility model relates to SO in flue gas3The on-line measurement of concentration, in particular to a sulfur trioxide on-line continuous measurement system with quick response.
Background
SO in flue gas of coal-fired unit3Boiler pipeline equipment corrosion is easily caused, and in recent years, the international coal price is increased, electricity coal is deficient, and a plurality of power plants are doped with high-sulfur coal for power generation, so that the more serious boiler pipeline equipment corrosion problem is easily caused; in addition, SO discharged from the stack3Is an important precursor for forming PM2.5 and is easy to introduceAnd generating atmospheric haze. For SO in coal-fired flue gas3The online monitoring is not only helpful for environmental protection workers to know the SO of the coal-fired flue gas3The concentration discharge condition has important guiding significance for adjusting the ammonia injection amount and the blending ratio of high-sulfur coal in a thermal power plant.
Therefore, the SO in the coal-fired flue gas is urgently needed3And the concentration is subjected to online monitoring research, and a test system with accurate test and sensitive response is developed. SO (SO)3The difficulty in measuring the concentration is that SO3The isopropyl alcohol absorption method and the controlled condensation method are two sampling methods which are used most in the industry. The industry has the SO based on the sampling principles of an isopropanol absorption method and a controlled condensation method respectively3On-line analyzer, SO developed based on isopropyl alcohol absorption method3The on-line analyzer can display the measured data in real time, but the device is not popularized in the industry, a small number of scientific research institutions purchase the analyzer, and research on the measurement accuracy is carried out, and the research finds that the measurement accuracy of the tester is 60-80%, and the true SO in the flue gas cannot be reflected3Concentration profile. SO developed based on controlled condensation method3The on-line analyzer can accurately measure SO in the flue gas3The concentration, but the instrument displays the measured data intermittently, and can not display the SO in the flue gas in real time3The concentration has the defect of long time interval for intermittently displaying the measured data. Therefore, shortening of SO developed based on the controlled condensation method3The time interval between the readings of the on-line analyzer is particularly important.
SUMMERY OF THE UTILITY MODEL
Aiming at the problems in the prior art, the utility model provides the sulfur trioxide online continuous measuring system with quick response, which has the advantages of reasonable design, short interval of intermittent display time, effective shortening of the measuring response time of the measuring system, accurate measurement and stable operation performance.
The utility model is realized by the following technical scheme:
a sulfur trioxide online continuous measuring system with quick response comprises a sampling measuring unit and a control system connected with the sampling measuring unit;
the sampling measurement unit comprises a multi-channel sampling gun, a flue gas acquisition device and a flushing device which are respectively connected with each channel of the multi-channel sampling gun in a one-to-one correspondence manner, and a common sulfate ion measurement device;
the flue gas collecting device comprises serpentine condenser pipes connected to the outlets of all channels of the multichannel sampling gun, and a gas-liquid separator, a gas flowmeter and a gas pump which are sequentially connected to the outlets of all the serpentine condenser pipes through the first outlet of a three-way electromagnetic valve;
the flushing device comprises flushing liquid storage tanks which are correspondingly connected with inlets of the snakelike condensation pipes through independent flushing pipelines respectively;
the sulfate ion measuring device comprises a collecting liquid storage tank, a reaction bed and a photoelectric signal detection system, wherein the collecting liquid storage tank is connected and arranged through a second outlet of the three-way electromagnetic valve; the input end of the reaction bed is also connected with a standard liquid storage tank.
Furthermore, the sampling gun adopts a multi-channel sampling gun with at least two channels, or a plurality of single sampling guns in parallel.
Furthermore, the contact surface of the sampling gun and the flue gas is provided with a sulfuric acid passivation layer or made of inert materials.
Furthermore, the snakelike condensation pipe is also connected with a constant temperature system; the constant temperature system adopts a water bath, an oil bath or other heat preservation heating systems.
Furthermore, the photoelectric signal detection system is provided with a temperature control device; and the gas-liquid separator, the reaction bed and the gas flowmeter are provided with refrigerating systems for cooling.
Furthermore, the reaction bed adopts any system for carrying out color reaction with sulfate ions.
Furthermore, the flushing system also comprises a delivery pump, wherein the delivery pump adopts any one of a multi-channel peristaltic pump, a plurality of single-channel peristaltic pumps or a plurality of pulse pumps; the delivery pump is respectively connected with the waste liquid outlet of the collecting liquid storage tank, the outlet of the standard liquid storage tank and the waste liquid outlet of the photoelectric signal detection system and is used for delivering corresponding media.
Furthermore, a pulse pump or a single peristaltic pump is respectively arranged on the second outlet pipeline of the three-way electromagnetic valve, the waste liquid outlet pipeline of the gas-liquid separator and each flushing liquid pipeline; the pulse pumps respectively arranged on the second outlet pipelines and/or the plurality of flushing liquid pipelines of the plurality of three-way electromagnetic valves are multi-channel peristaltic pumps, and the number of channels of the multi-channel peristaltic pumps corresponds to the number of outlets of the snake-shaped condensation pipes and/or the number of flushing pipelines respectively.
Compared with the prior art, the utility model has the following beneficial technical effects:
the utility model adopts the multi-channel sampling gun and the snake-shaped condenser pipes, the flushing pipelines and the flue gas acquisition system which are connected with the channels of the sampling gun in a one-to-one correspondence and are mutually independent, SO that each sampling channel is provided with the independent flushing pipeline, the gas-liquid separator, the gas flowmeter and the gas pump, the multi-channel sequential switching sampling and flushing can be more conveniently and rapidly carried out, the interval of intermittent display time is effectively shortened, the measurement response time of the measurement system is further shortened, and the utility model has important guiding significance for preventing and treating air preheater blockage and pipeline corrosion of a coal-fired power plant and an industrial boiler, guiding the coal-fired power plant to adjust the ammonia injection amount and the high-sulfur coal blending combustion ratio, and can monitor the SO of clean flue gas on line3Concentration discharge conditions.
Furthermore, the utility model adopts the multi-channel sampling gun with at least two channels or a plurality of parallel single sampling guns as the sampling guns, and has various forms, convenience and reliability.
Further, the utility model carries out passivation treatment on the contact surface of the sampling gun and the flue gas, thereby forming an oxide film on the surface of the sampling gun and avoiding SO in the flue gas3Or sulfuric acid vapor reaction, can effectively ensure the air extraction sampling temperature.
Furthermore, the temperature of the snake-shaped condenser pipe can be effectively controlled by arranging the water bath or oil bath constant temperature system on the snake-shaped condenser pipe, so that the flue gas condensation effect is ensured.
Furthermore, the utility model adopts a refrigeration system to control the temperature of the gas-liquid separator, the gas flowmeter and the reaction bed, and adopts a temperature control device of the photoelectric signal detection system to control the temperature, thereby effectively improving the system acquisition and measurement efficiency and ensuring accurate and reliable measurement results.
Furthermore, the delivery pump is arranged in the system, so that the collected gas can be effectively transmitted, and the efficiency of the whole system is improved; meanwhile, the pulse pump is arranged, so that the measurement rate of the whole system is further improved.
Drawings
Fig. 1 is a schematic structural diagram of the system according to the embodiment of the present invention.
In the figure: sampling gun 1, pulse pump 2, first pulse pump 2A, second pulse pump 2B, flush fluid storage tank 3, snakelike condenser pipe 4, first snakelike condenser pipe 4A, second snakelike condenser pipe 4B, collect liquid storage tank 5, mark liquid storage tank 6, delivery pump 7, reaction bed 8, three-way solenoid valve 9, first three-way solenoid valve 9A, second three-way solenoid valve 9B, photoelectric signal detecting system 10, vapour and liquid separator 11, gas flowmeter 12, air pump 13, first air pump 13A, second air pump 13B, constant temperature system 14, control system 15.
Detailed Description
The present invention will now be described in further detail with reference to specific examples, which are intended to be illustrative, but not limiting, of the utility model.
Example 1
The utility model relates to a sulfur trioxide online continuous measurement system with quick response, which comprises a sampling measurement unit and a control system 15; the sampling measurement unit comprises a multi-channel sampling gun 1, a flue gas collection device consisting of a serpentine condenser tube 4, a gas-liquid separator 11, a gas flowmeter 12 and an air pump 13, a flushing device consisting of a flushing fluid storage tank 3, and a sulfate ion measurement device consisting of a collected liquid storage tank 5, a standard liquid storage tank 6, a reaction bed 8 and a photoelectric signal detection system 10; the sampling measurement unit also comprises a three-way electromagnetic valve 9, a constant temperature system 14, a pulse pump 2 and a delivery pump 7;
each channel of the multi-channel sampling gun 1 is connected with the inlet of each snake-shaped condenser pipe 4 through an independent flushing pipeline, and each independent flushing pipeline is provided with a pulse pump 2 and is connected with a common flushing liquid storage tank 3; each serpentine condenser pipe 4 is connected with a constant temperature system 14, and the outlet of each serpentine condenser pipe 4 is respectively provided with a three-way electromagnetic valve 9; the first outlet of each three-way electromagnetic valve is respectively connected with an independent gas-liquid separator 11, an independent gas flowmeter 12 and an independent air pump 13, and the second outlet is provided with a pulse pump 2 and is connected with a common collected liquid storage tank 5; the outlet of the collecting liquid storage tank 5 is connected with a reaction bed 8 and a photoelectric signal detection system 10, and the waste liquid outlet is connected with a delivery pump 7; the input end of the reaction bed 8 is also connected with a standard liquid storage tank 6, and the outlet of the standard liquid storage tank 6 is connected with a delivery pump 7; a waste liquid outlet of the photoelectric signal detection system 10 is connected with a delivery pump 7; and a waste liquid outlet pipeline of the gas-liquid separator 11 is also provided with a pulse pump 2.
Preferably, the sampling gun 1 can be a plurality of channel sampling guns with the channel number larger than 1, or a plurality of single sampling guns, and the system measurement response time can be further shortened by adopting the plurality of sampling guns;
preferably, the contact surface of the sampling gun 1 and the flue gas is passivated by sulfuric acid or made of inert materials, SO that the contact surface of the sampling gun 1 is ensured not to be contacted with SO in the flue gas3Or sulfuric acid vapor reaction, and the heating temperature is controllable at 200-350 ℃, so that the temperature of the extracted gas is ensured to be not lower than 220 ℃.
Preferably, the specification of the serpentine condenser tube 4 is related to the sampling rate, and the specification is that SO can be realized when a certain sampling rate is adopted3/H2SO4Complete capture of the vapor is preferred.
Preferably, the thermostatic system 14 can be a water bath, an oil bath or any other heat-preserving heating system capable of ensuring a constant temperature control of the serpentine condenser tube 4, so that the serpentine condenser tube 4 is at a temperature ranging from 60 ℃ to 95 ℃.
Preferably, the optoelectronic signal testing system 10 is provided with a temperature control device, and the temperature of the temperature control device is constant at room temperature +3 ℃.
Preferably, the gas-liquid separator 11, the reaction bed 8 and the gas flowmeter 12 are provided with a refrigeration system for cooling, and the refrigeration system can be any one of a water chiller, a compression refrigerator, a peltier refrigerator and the like capable of cooling a system, so as to ensure the temperature of a low-temperature region.
Preferably, the reaction bed 8 can be any system capable of color reaction with sulfate ion.
Preferably, the delivery pump 7 may be a multi-channel peristaltic pump, a plurality of single-channel peristaltic pumps, or a plurality of pulse pumps.
Preferably, the pulse pump 2 can be replaced by a single peristaltic pump or a multi-channel peristaltic pump.
Preferably, the control system 15 can be any programmable software or element.
In this embodiment, taking the sampling gun 1 with two channels as an example, as shown in fig. 1, the two channels of the sampling gun 1 are respectively connected to a first serpentine condenser tube 4A and a second serpentine condenser tube 4B; the outlets of the first serpentine condenser pipe 4A and the second serpentine condenser pipe 4B are respectively provided with a first three-way electromagnetic valve 9A and a second three-way electromagnetic valve 9B, and the two flushing liquid pipelines of the inlets are respectively provided with a first pulse pump 2A and a second pulse pump 2B;
when the system is used, the measurement system is started, and a system calibration program is started to calibrate the test system;
after the system to be tested is calibrated, the system to be tested enters a test mode, the first serpentine condenser tube 4A gas path channel is started for sampling, and the second serpentine condenser tube 4B gas path sampling channel is in a closed state. After the sampling is performed for half of the time, the second serpentine condenser tube 4B gas path sampling channel is started for sampling (at the moment, the liquid path channel of the second serpentine condenser tube 4B is in a closed state), after the sampling of the first serpentine condenser tube 4A channel is finished, the first gas pump 13A is closed, the first pulse pump 2A is started to inject flushing liquid into the first serpentine condenser tube 4A to flush the inner wall of the first serpentine condenser tube 4A, the liquid path channel of the first three-way electromagnetic valve 9A is opened, the flushing liquid is collected in the collecting liquid storage tank 5, the collecting liquid enters the reaction bed 8 and the photoelectric signal detection system 10 successively under the power of the conveying pump 7 to be tested for sulfate ion concentration, and finally, the SO in the flue gas is calculated through a calculation formula written in the control system 153Concentration of and willThe concentration is displayed on a display screen of the control system 15;
after the collection of completion flush fluid, start the sampling procedure of first snakelike condenser pipe 4A passageway at once and sample, the sampling is accomplished to second snakelike condenser pipe 4B passageway afterwards, starts second pulse pump 2B immediately and pours into the flush fluid into second snakelike condenser pipe 4B and washes second snakelike condenser pipe 4B inner wall into to open first solenoid valve 9A's liquid way passageway, collect the flush fluid in collecting liquid storage tank 5. After the collection of completion flush fluid, start the sampling procedure of second snakelike condenser pipe 4B passageway at once and sample, switch over the process so in proper order, can shorten half with the system time interval of this equipment, the test response time of greatly reduced this system.
By adopting the two-channel sampling gun as an example, the operation steps in practical use comprise,
the reaction bed 8 and the photoelectric signal detection system 10 utilize the standard liquid in the standard liquid storage tank 6 to calibrate the test system;
after the system to be tested is calibrated, entering a test mode, starting a first serpentine condenser tube 4A gas path channel for sampling, and closing a second serpentine condenser tube 4B gas path sampling channel; when the sampling of the first serpentine condenser pipe 4A is performed for half of the time, a gas path sampling channel of a second serpentine condenser pipe 4B is started for sampling;
after sampling of the first serpentine condenser pipe 4A channel is finished, injecting flushing liquid into the first serpentine condenser pipe 4A to flush the inner wall of the first serpentine condenser pipe 4A, opening a liquid path channel connected with a second outlet of the first electromagnetic valve 9A, and collecting the flushing liquid in the liquid collecting storage tank 5; the collected liquid enters the reaction bed 8 and the photoelectric signal detection system 10 in sequence to carry out sulfate ion concentration test and is output to the control system 15;
after the washing liquid collection of the channel 4A of the first serpentine condenser pipe is finished, sampling is carried out; meanwhile, after the gas path of the second serpentine condenser pipe 4B finishes sampling, collecting flushing liquid;
and repeating the steps, and alternately sampling and flushing the first serpentine condenser pipe 4A and the second serpentine condenser pipe 4B to realize online continuous measurement of sulfur trioxide.
Wherein the content of the first and second substances,
the first serpentine condenser pipe 4A and the second serpentine condenser pipe 4B are provided with a constant temperature system 14, and the temperature control range is 60-95 ℃;
the photoelectric signal detection system 10 is provided with a temperature control device, and the temperature is controlled to be constant at room temperature plus 3 ℃;
and the gas-liquid separator 11, the reaction bed 8 and the gas flowmeter 12 are all provided with a refrigerating system for cooling.
The measurement system according to the utility model used in this example was carried out on a system as shown in FIG. 1 and used a sample containing 25mg/m3SO of (A)3/H2SO4Steam simulation flue gas is tested:
a simulated sulfuric acid steam test bed is built in a laboratory, SO3/H2SO4 steam containing 25mg/m3 is configured to simulate flue gas, a double-channel sampling system provided by the utility model is used for measurement, meanwhile, a single-channel sampling system is used for comparison test, and the sampling time is set to be 5 minutes. The test result is that the single-channel test system and the double-channel test system are accurate in measurement, the single-channel test numerical value display time interval is 6.3min, and the double-channel test numerical value display time interval is 3.15 min. The response time of the test system can be significantly reduced.
Example 2
The measurement system according to the utility model used in this example was carried out on a system as shown in FIG. 1 and used a sample containing 25mg/m3SO of (A)3/H2SO4Steam simulation flue gas is tested:
a simulated sulfuric acid steam test bed is built in a laboratory, SO3/H2SO4 steam containing 50mg/m3 is configured to simulate flue gas, a double-channel sampling system provided by the utility model is used for measurement, meanwhile, a single-channel sampling system is used for comparison test, and the sampling time is set to be 2 minutes. The test result is that the single-channel test system and the double-channel test system are accurate in measurement, the single-channel test numerical value display time interval is 2.8min, and the double-channel test numerical value display time interval is 1.4 min. The response time of the test system can be significantly reduced.
Claims (8)
1. The online continuous sulfur trioxide measuring system with quick response is characterized by comprising a sampling measuring unit and a control system (15) connected with the sampling measuring unit;
the sampling measurement unit comprises a multi-channel sampling gun (1), a flue gas acquisition device and a flushing device which are respectively connected with each channel of the multi-channel sampling gun (1) in a one-to-one correspondence manner, and a common sulfate ion measurement device;
the flue gas collecting device comprises serpentine condenser pipes (4) connected to the outlets of all channels of the multichannel sampling gun (1), and a gas-liquid separator (11), a gas flowmeter (12) and a gas pump (13) which are sequentially connected to the outlet of each serpentine condenser pipe (4) through a first outlet of a three-way electromagnetic valve (9);
the flushing device comprises flushing liquid storage tanks (3) which are correspondingly connected with inlets of the snakelike condensation pipes (4) through independent flushing pipelines respectively;
the sulfate ion measuring device comprises a collecting liquid storage tank (5) which is connected and arranged through a second outlet of a three-way electromagnetic valve (9), a reaction bed (8) which is connected with the outlet of the collecting liquid storage tank (5) and a photoelectric signal detection system (10); the input end of the reaction bed (8) is also connected with a standard liquid storage tank (6).
2. The system for the on-line continuous measurement of sulfur trioxide with fast response according to claim 1 is characterized in that the sampling gun (1) adopts a multi-channel sampling gun with at least two channels, or a plurality of single sampling guns in parallel.
3. The system for the on-line continuous measurement of sulfur trioxide with fast response according to claim 1, characterized in that the contact surfaces of the sampling gun (1) and the flue gas are provided with a sulfuric acid passivation layer or made of inert materials.
4. The system for the on-line continuous measurement of sulfur trioxide with fast response according to the claim 1 is characterized in that the serpentine condenser tube (4) is further connected with a constant temperature system (14); the constant temperature system (14) adopts a heat preservation heating system.
5. The system for the on-line continuous measurement of sulfur trioxide with rapid response according to claim 1, characterized in that the photoelectric signal detection system (10) is provided with a temperature control device; and the gas-liquid separator (11), the reaction bed (8) and the gas flowmeter (12) are all provided with refrigeration systems for cooling.
6. The system for the on-line continuous measurement of sulfur trioxide with rapid response according to claim 1, characterized in that the reaction bed (8) adopts any system which performs a color reaction with sulfate ions.
7. The system for on-line continuous measurement of sulfur trioxide in response to rapid speed according to claim 1, characterized in that the flushing device further comprises a delivery pump (7), the delivery pump (7) adopts any one of a multi-channel peristaltic pump, a plurality of single-channel peristaltic pumps, or a plurality of pulse pumps; and the delivery pump (7) is respectively connected with a waste liquid outlet of the collecting liquid storage tank (5), an outlet of the standard liquid storage tank (6) and a waste liquid outlet of the photoelectric signal detection system (10) and is used for delivering corresponding media.
8. The system for on-line continuous measurement of sulfur trioxide with fast response according to claim 1, characterized in that the second outlet pipeline of the three-way solenoid valve (9), the waste liquid outlet pipeline of the gas-liquid separator (11) and each flushing liquid pipeline are respectively provided with a pulse pump (2) or a single peristaltic pump; the pulse pumps (2) respectively arranged on the second outlet pipelines and/or the flushing liquid pipelines of the three-way electromagnetic valves (9) are multi-channel peristaltic pumps, and the number of channels of the multi-channel peristaltic pumps corresponds to the number of outlets of the serpentine condenser tubes (4) and/or the number of flushing pipelines respectively.
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| WO2023010634A1 (en) * | 2021-08-06 | 2023-02-09 | 西安热工研究院有限公司 | Quick-response online continuous measurement system for sulfur trioxide and method therefor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2023010634A1 (en) * | 2021-08-06 | 2023-02-09 | 西安热工研究院有限公司 | Quick-response online continuous measurement system for sulfur trioxide and method therefor |
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