CN108931555A - It is a kind of to realize the multifactor flue gas acid dew point experimental provision quantitatively controlled and experimental method - Google Patents
It is a kind of to realize the multifactor flue gas acid dew point experimental provision quantitatively controlled and experimental method Download PDFInfo
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- CN108931555A CN108931555A CN201710383407.0A CN201710383407A CN108931555A CN 108931555 A CN108931555 A CN 108931555A CN 201710383407 A CN201710383407 A CN 201710383407A CN 108931555 A CN108931555 A CN 108931555A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/56—Investigating or analyzing materials by the use of thermal means by investigating moisture content
- G01N25/66—Investigating or analyzing materials by the use of thermal means by investigating moisture content by investigating dew-point
Abstract
A kind of to realize the multifactor flue gas acid dew point experimental provision quantitatively controlled and experimental method, experimental provision includes high pressure gas cylinder, shut-off valve, pressure reducing valve, throttle valve, mass flow controller, check-valves, flow indication controller, mixed gas tank, tubular heater, expansion box, pressure gauge, water storage device, flowmeter, micro-atomizing nozzle, heat-exchanger rig, temperature sensor, temperature display meter, ash bucket, screw(-type) feeder, constant temperature water tank, temperature control equipment, experimental section, acid dew point probe, data vision-control instrument, exhaust gas processing device；Experimental provision can quantify simulation different component, humidity, flow velocity, the flue gas stream of dust burdening, influence of the quantitative study difference factor to acid dew point.
Description
Technical field
The invention belongs to waste heat recycling, boiler low-temperature corrosion field, are related to a kind of realizing the multifactor flue gas quantitatively controlled
Acid dew point experimental provision and experimental method.
Background technique
Heat loss due to exhaust gas is one of maximum heat loss of boiler, therefore reducing exhaust gas temperature is to improve boiler thermal efficiency most
One of effective means.But contain CO in boiler tail flue gas2, SO2, SO3Equal sour gas, these are acid under cryogenic
Gas can form corresponding acid vapor in conjunction with the vapor in flue gas.When flue gas and the metal convection heating surface for being lower than acid dew point
When contact, acid vapor will go out acid droplet in metal heated face surface condensation.The acid droplet of these condensations not only will be to heating surface
It causes to corrode, moreover it is possible to cause dust stratification hardening blocking in conjunction with the iron rust of fly ash granule and metal heated face corrosion spalling in flue gas
Flue may cause burning in furnace and deteriorate or be unable to run.Thus, can Accurate Prediction flue gas acid dew point to station boiler
Safe and stable operation be of great significance.
The forming process of sulfuric acid vapor is sufficiently complex in practical flue gas environment.Flue gas composition, temperature, humidity, pressure, and
Dust burdening is all an important factor for influencing acid dew point.Related scholar domestic and international at present is about dust burdening in low-temperature flue gas to acid dew point
The research of influence is actually rare.
The method of studies in China acid dew point mainly has infusion method, In Situ, simulated experiment etc., in numerous methods at present
Middle experimental analogic method has the advantages of accurately controlling flue gas composition, analysis unitary variant influences acid dew point.But it is presently relevant
Experimental provision, which mostly uses greatly, sprays into dilute sulfuric acid in mixed gas to simulate gas containing acid fume, and not in view of ash content in flue gas
Influence of the content to acid dew point.
With a large amount of uses of flue gas waste heat recovery system, boiler tail exhaust gas temperature is lower and lower, in depth energy saving benefit
100 DEG C or so are down to middle smoke temperature, in conventional heat flue gas dew point hereinafter, but not occurring in actual moving process bright
Aobvious corrosion phenomenon, therefore consider that influence of the dust burdening to acid dew point just becomes particularly significant in flue gas.But it is domestic at present to close
The research influenced in ash content on acid dew point is actually rare, studies about quantitative study content of ashes acid dew point in low-temperature flue gas
Experimental bench at home there is not yet.
Summary of the invention
The present invention provides one kind can accurately control including cigarette gas component, the shadow including flow velocity, humidity, dust burdening etc.
Ring the experimental provision and method of the multifactor quantitative flue gas acid dew point of realization of the factor of flue gas acid dew point.
In order to achieve the above objectives, the inventive system comprises gas mixing heating system, gas storage pressure fixing system, humidification systems
System, temperature control equipment add ash system, experimental section, exhaust gas processing device；
The gas mixing heating system includes four high pressure gas cylinders, four quality streams being respectively connected with high pressure gas cylinder
Amount controller, mix gas tank, tubular heater, four mass flow controller imports by pipeline respectively with four high pressures
Gas cylinder is connected, and the mass flow controller outlet that wherein sulfur dioxide and oxygen flow through is connected by pipeline with mixed gas tank entrance,
The mass flow controller outlet that carbon dioxide and nitrogen flow through is connected by pipeline with gas storage pressure fixing system, the quality stream
Amount controller is connected by route with flow indication controller, and the mixed gas tank outlet passes through pipeline and tubular heater entrance
It is connected, tubular heater outlet is connected with gas storage pressure fixing system；
The gas storage pressure fixing system is made of air accumulator and level pressure bypass pipeline section, and air accumulator entrance passes through pipeline and tubular type
Furnace outlet and the two mass flow controllers outlet for flowing through carbon dioxide and nitrogen are connected, and reservoir outlet passes through pipe
Road is connected with temperature control equipment, and the level pressure bypass pipeline section entrance is connected with air accumulator associated outlet with exhaust treatment system；
The humidification system is by water storage device, flowmeter, throttle valve, micro-atomizing nozzle composition, the water storage device
Outlet is connected by pipeline with flowmeter entrance, and the flowmeter outlet is connected by pipeline with throttle valve import, and throttle valve goes out
Mouth is connected by pipeline with the microatomization nozzle being mounted at the top of air accumulator；
The temperature control equipment is the heat exchanger of temperature-controllable；
Described plus ash system is made of screw(-type) feeder and ash bucket；
Be disposed with the heat-exchanger rig being connected by pipeline with constant temperature water tank inside the experimental section, and with acid dew point data
The connected acid dew point probe of vision-control instrument, adds resistive heater inside the constant temperature water tank, inside constant temperature water tank
Resistive heater be connected with temperature control equipment by route；
The exhaust gas processing device includes solution storage device, and long tube, short tube, the long tube inlet and experimental section export
It is connected, the liquid level of liquid is hereinafter, the short tube entrance and the solution storage device page in long tube outlet insertion solution storage device
Above to be connected, short tube outlet is passed through outdoor environment；
Experimental method of the invention includes the following steps：
1) it mixes gas heating system and quantitatively controls mixing gas component：
The pressure that high pressure gas cylinder eluting gas is reduced by pressure reducing valve flows out gas by throttle valve coarse adjustment high pressure gas cylinder (29)
The flow of body accurately controls gas flow by the flow number that flow indication controller sets four mass flow controllers,
Heat sulfur dioxide by setting tubular heater temperature makes it react a certain amount of sulfur trioxide of generation with oxygen；
2) gas storage pressure fixing system mixture pressure controls：
The aperture of throttle valve on pipeline section is bypassed by adjusting level pressure come inside Control experiment section inlet pressure level and air accumulator
Pressure value；
3) experimental section inlet temperature controls
The temperature value as measured by the temperature sensor installed additional in air accumulator with experimental section inlet adjusts heat-exchanger rig
Inlet temperature adjusts the mixed gas temperature into experimental section with this；
4) gas storage pressure fixing system mixed gas humid control
Flowmeter numerical stability is passed through into fine mist in setting value by adjusting the throttle valve on humidification system export pipeline
Change nozzle and quantitative deionized water atomization is sprayed into air accumulator；
5) mixed gas dust burdening controls：
The ash quantity that pipeline section is added is controlled by adjusting screw(-type) feeder revolving speed；
6) mixed gas temperature controls in test section
The water temperature in constant temperature water tank is controlled by set temperature control device parameter, passes through the water in regulating thermostatic water tank
Temperature carrys out mixed gas temperature in substantially Control experiment section.
7) acid dew point measures
Acid dew point probe temperature is adjusted by data vision-control instrument, the voltage occurred by data vision-control instrument
Situation of change determines acid dew point numerical value.
Compared with existing experimental technique, the present invention is had the following advantages that：
1, the present invention achievees the purpose that be quantitatively adding ash content using screw(-type) feeder and ash bucket, to realize quantitative study ash
Divide the purpose of the influence to low-temperature flue gas acid dew point；
2, Actual combustion process is simulated using the mixed gas of tubular heater heating sulfur dioxide and oxygen in the present invention
The generation of middle sulfur trioxide；
3, the present invention is the stabilization of guarantee test section experimental situation, be may be implemented provided with gas storage pressure fixing system to experimental section
The control of inlet pressure, and by by the cooperation of gas storage pressure fixing system and test section inlet mass flow controller, realizing pair
The control of experimental section inlet flow rate.
Detailed description of the invention
The present invention will be further described with reference to the accompanying drawing.
Fig. 1 is structural schematic diagram of the invention.
In figure respectively marked as：1, pressure reducing valve；2, throttle valve；3, mass flow controller；4, flow indication controller；5, only
Return valve；6, gas tank is mixed；7, flowmeter；8, water storage device；9, micro-atomizing nozzle；10, the heat exchanger of temperature-controllable；11, spiral
Batcher；12, ash bucket；13, pressure gauge；14, experimental section；15, constant temperature water tank；16, temperature control equipment；17, short tube；18, molten
Liquid storage device；19, long tube；20, acid dew point is popped one's head in；21, data vision-control instrument；22, temperature sensor；23, by level pressure
Siphunculus section；24, temperature display meter；25, expansion box；26, tubular heater；27, shut-off valve；28, high pressure gas cylinder.
Specific embodiment
Referring to Fig. 1, the inventive system comprises gas mixing heating system, gas storage pressure fixing system, humidification system, temperature controls
Device processed adds ash system, experimental section, exhaust gas processing device；
The gas mixing heating system includes four high pressure gas cylinders (28), and four are respectively connected with high pressure gas cylinder (28)
Mass flow controller (3), mix gas tank (6), tubular heater (26), four mass flow controller (3) imports
It is connected by pipeline with four high pressure gas cylinders (28), two mass flow controllers (3) for flowing through sulfur dioxide and oxygen export
It is connected by pipeline with mixed gas tank (6) entrance, two mass flow controllers (3) outlet for flowing through carbon dioxide and nitrogen passes through
Pipeline is connected with gas storage pressure fixing system, and the mass flow controller (3) passes through route and flow indication controller (4) phase
Even, the mixed gas tank (6) outlet is connected by pipeline with tubular heater (26) entrance, tubular heater (26) outlet and storage
Gas pressure fixing system is connected, and successively pacifies on gas piping according to gas flow direction before described mass flow controller (3) import
Equipped with shut-off valve (27), pressure reducing valve (1), throttle valve (2) is equipped with check-valves on the mass flow controller export pipeline
(5)；The adjustable flow that mass flow controller (3) are flowed through with control of the Mass flow controllers (4)；The pipe
Formula heating furnace (27) can control heating temperature, and four high pressure gas cylinders (28) are respectively provided with liquid sulfur dioxide, nitrogen,
Oxygen, carbon dioxide；
The gas storage pressure fixing system is made of air accumulator (25) and level pressure bypass pipeline section (23), and air accumulator (25) entrance is logical
It crosses pipeline and tubular heater (26) outlet and flows through the outlet of two mass flow controllers (3) of carbon dioxide and nitrogen
It is connected, air accumulator (25) outlet is connected by pipeline with temperature control equipment entrance, and the tubular heater (26) can be manual
Heating temperature is set, tubular heater (26) is internal and gas contact portion is the more empty nonmetallic substances of high temperature resistant, described fixed
Pressure bypass pipeline section (23) entrance is connected with air accumulator (25), and level pressure bypass pipeline section (23) outlet is connected with exhaust treatment system；Institute
Pressure gauge (13) and temperature sensor (22) are housed in the air accumulator (25) stated, section is installed on level pressure bypass pipeline section (23)
It flows valve (2)；
The humidification system is by water storage device (8), flowmeter (7), throttle valve (2), micro-atomizing nozzle (9) composition, institute
Water storage device (8) outlet stated is connected by pipeline with flowmeter (7) entrance, and flowmeter (7) outlet passes through pipeline and section
Valve (2) import to be flowed to be connected, throttle valve (2) outlet is connected by pipeline with the microatomization nozzle (9) being mounted at the top of air accumulator,
The water storage device (8) is for storing deionized water, and the microatomization nozzle (9) is for deionized water to be atomized and spray
Enter air accumulator (25)；
The temperature control equipment is the heat exchanger (10) of temperature-controllable, and the heat exchanger (10) of the temperature-controllable can
With according to be installed in air accumulator (25) and temperature measured by the temperature sensor (22) of test section inlet adjust heat exchange
Medium entrance temperature controls mixed gas temperature with this；
Described plus apparatus for ash is made of screw(-type) feeder (11) and ash bucket (12), and the screw(-type) feeder (11) can be with hand
Dynamic to adjust revolving speed, the ash bucket (12) is for storing dry ash；
The heat-exchanger rig being connected by pipeline with constant temperature water tank (15), three and acid are disposed with inside the experimental section (14)
The connected acid dew point of dew point data vision-control instrument (21) is popped one's head in (20), and heating electricity is added in the constant temperature water tank (15)
Silk is hindered, resistive heater is connected by route with temperature control equipment (16) in constant temperature water tank (15), the temperature control equipment
(16) temperature of adjustable constant temperature water tank (15), the experimental section (14) pass through temperature control equipment (16) during the test
The temperature of regulating thermostatic water tank (16), and then mixed gas temperature substantially in Control experiment section, the data display regulator
Table (21) can regulate and control acid dew point probe (20) temperature, and determine acid dew point number by the voltage change of acid dew point probe (20)
Value, arrangement heat-exchanger rig can be such that ash content mixes sufficiently with mixed gas inside experimental section (14), and substantially control simulation cigarette
The temperature of gas, makes experimentation and is actually more nearly；
The exhaust gas processing device includes solution storage device (18), and long tube (19) and short tube (17) form, wherein growing
Pipe (19) entrance is connected with experimental section (14) outlet, and long tube (19) outlet is protruded under alkaline solution liquid level, the short tube (17)
Entrance is in alkaline solution liquid level or more, and short tube (17) outlet is communicated with outdoor environment；
Experimental method of the present invention is as follows：
1) it mixes gas heating system and quantitatively controls mixing gas component：
By the opening and closing of shut-off valve (27) control high pressure gas cylinder (28), high pressure gas cylinder (29) stream is reduced by pressure reducing valve (1)
The pressure of gas out passes through flow indication controller by the flow of throttle valve (27) coarse adjustment high pressure gas cylinder (28) eluting gas
(4) flow of four mass flow controllers (3) is set, flow indication controller (4) is by adjusting mass flow controller (3)
The aperture thin tuning gas flow of itself valve is cooperated by throttle valve (2) and flow indication controller (4) by each group shunt volume
It is adjusted to setting value；
2) gas storage pressure fixing system simulated flue gas pressure controls：
By adjust temperature-controllable heat exchanger (10) export pipeline on throttle valve (2) and pressure reducing valve (1) coarse adjustment entrance
The flow of the mixed gas of test section (14) is exported by the controllable heat exchanger (10) of flow indication controller (4) set temperature
The improve quality flow of flow controller (3) of pipeline makes the flow of mixed gas to setting value, the flow indication controller (4)
By adjusting the aperture thin tuning gas flow of mass flow controller (3) itself valve, pipeline section is bypassed by adjusting level pressure
(24) throttle valve (2) controls experimental section (14) inlet pressure level on, if setting value can not be adjusted, cooperation adjusts temperature-controllable
Throttle valve (2) and pressure reducing valve (1) on heat exchanger (10) export pipeline are repeated several times until by experimental section inlet pressure and flow
It is adjusted to setting value；
3) experimental section inlet temperature controls：
Temperature value measured by the temperature sensor installed additional as air accumulator (25) outlet with experimental section (14) entrance, manually
The inlet temperature for adjusting heat-exchange working medium in the heat exchanger (10) of temperature-controllable, adjusts the mixed gas into experimental section (14) with this
Temperature, if experimental section inlet temperature reaches set-point temperature control device and do not start；
4) gas storage pressure fixing system mixed gas humid control：
Flowmeter (7) numerical value is fixed on setting value by adjusting the throttle valve (2) on humidification system export pipeline, is passed through
Quantitative deionized water atomization is sprayed into air accumulator (25) by micro-atomizing nozzle (9)；
5) mixed gas dust burdening controls：
The ash quantity being added in pipeline section is controlled by adjusting screw(-type) feeder (13) revolving speed, the ash quantity of feeding can pass through calculating
It obtains；
6) mixed gas temperature controls in experimental section：
By set temperature control device (16) numerical value, the temperature of constant temperature water tank (15) is controlled, it will be in constant temperature water tank (15)
Water introduces test section (14) interior heat-exchanger rig, the temperature of mixed gas substantially in Control experiment section；
7) acid dew point measures
Three acid dew points probe (20) temperature respectively are adjusted by data vision-control instrument (21), passes through data and shows tune
Section instrument (21) measurement acid dew point probe (20) voltage change situation determines acid dew point numerical value；
Experiment first closes throttle valve (2) on the heat exchanger of temperature-controllable (10) export pipeline when starting, opening temperature
Control device (16), and temperature is set higher than to the numerical value of experimental temperature, level pressure is bypassed into throttle valve (2) on pipeline section (23) and is opened
To maximum, four high pressure gas cylinder (28) rates of discharge are then adjusted to setting value, to four high pressure gas cylinder (28) rate of discharge tune
After the completion of section, tubular heater (26) are opened and set temperature until reaching setting value, take portion before exhaust gas processing device entrance
Divide flue gas and measures SO3Concentration completes SO3After measurement of concetration, the throttle valve (2) slowly opened on humidification system export pipeline is adjusted
Section enters the flow of the deionized water of system to setting value, throttle valve (2) on heat exchanger (10) export pipeline of temperature-controllable, and
It is appropriate close throttle valve (2) in level pressure bypass pipeline section (24) and adjust enter the mixed gas flow of test section (11) to setting value,
The controllable heat exchanger of opening temperature (10) is determined whether according to air accumulator (14) interior mixed gas temperature, it can if opening adjusting temperature
It is simultaneously appropriate to readjust throttle valve (2) on heat exchanger (10) export pipeline for opening adjusting temperature-controllable for the heat exchanger (10) of control
Throttle valve (2) in level pressure bypass pipeline section (23) is closed to readjust into the flow containing acid gas of test section (14) to setting value,
Until the flow containing acid gas and pressure into test section (14) reach setting value, temperature control equipment (16) temperature number is adjusted
Value is experimental temperature, and constant temperature water tank is waited to be cooled to setting value, sets three acid dew points by data vision-control instrument (21)
Probe (20) temperature, and start to acquire data.
Claims (3)
1. a kind of flue gas acid dew point experimental provision for realizing multifactor quantitatively regulating and controlling, it is characterised in that：It includes that gas mixing adds
Hot systems, gas storage pressure fixing system, humidification system, temperature control equipment add ash system, experimental section, exhaust gas processing device；
The gas mixing heating system includes four high pressure gas cylinders (28), four matter being respectively connected with high pressure gas cylinder (28)
It measures flow controller (3), mixes gas tank (6), tubular heater (26), four mass flow controller (3) imports pass through
Pipeline is connected with four high pressure gas cylinders (28), and mass flow controller (3) outlet that wherein sulfur dioxide and oxygen flow through passes through
Pipeline is connected with mixed gas tank (6) entrance, and mass flow controller (3) outlet that carbon dioxide and nitrogen flow through passes through pipeline and storage
Gas pressure fixing system is connected, and the mass flow controller (3) is connected by route with flow indication controller (4), described
Mixed gas tank (6) outlet is connected by pipeline with tubular heater (26) entrance, tubular heater (26) outlet and gas storage level pressure system
System is connected；
The gas storage pressure fixing system is made of air accumulator (25) and level pressure bypass pipeline section (23), and air accumulator (25) entrance passes through pipe
Road exports and flows through carbon dioxide with tubular heater (26) and two mass flow controllers (3) outlet of nitrogen is connected,
Air accumulator (25) outlet is connected by pipeline with temperature control equipment, level pressure bypass pipeline section (23) entrance and air accumulator (26)
Associated outlet is connected with exhaust treatment system；
The humidification system is by water storage device (8), and flowmeter (7), throttle valve (2), micro-atomizing nozzle (9) forms, described
Water storage device (8) outlet is connected by pipeline with flowmeter (7) entrance, and flowmeter (7) outlet passes through pipeline and throttle valve
(2) import is connected, and throttle valve (8) outlet is connected by pipeline with the microatomization nozzle (9) being mounted at the top of air accumulator (25)；
The temperature control equipment is the heat exchanger (10) of temperature-controllable；
Described plus ash system is made of screw(-type) feeder (12) and ash bucket (13)；
The heat-exchanger rig being connected by pipeline with constant temperature water tank (15) is disposed with inside the experimental section (14), and aobvious with data
Show regulation meter (21) connected acid dew point probe (20), resistive heater passes through route and temperature in the constant temperature water tank (15)
Control device (16) are spent to be connected；
The exhaust gas processing device includes solution storage device (18), long tube (19), short tube (17), long tube (19) entrance
It is connected with experimental section (14) outlet, the liquid level of liquid is hereinafter, described short in long tube (19) outlet insertion solution storage device (18)
More than pipe (17) entrance and solution storage device (19) page it is connected, short tube (17) outlet is passed through outdoor environment.
2. a kind of flue gas acid dew point experimental provision for realizing multifactor quantitatively regulating and controlling as described in claim 1, it is characterised in that：
The experimental provision realizes the control to experimental section (14) pressure using gas storage pressure fixing system.
3. a kind of experimental method for the flue gas acid dew point experimental provision for realizing multifactor quantitatively regulating and controlling as described in claim 1,
It is characterized in that：
1) by adjusting screw(-type) feeder (12) revolving speed, ash content dry in ash bucket (13) is quantitatively adding in mixed gas, it is real
Now to the control of dust burdening in simulated flue gas；
2) it is generated three in sulfur trioxide simulated flue gas in experimentation using the mixed gas of high-temperature heating sulfur dioxide and oxygen
The formation of sulfur oxide.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710383407.0A CN108931555A (en) | 2017-05-26 | 2017-05-26 | It is a kind of to realize the multifactor flue gas acid dew point experimental provision quantitatively controlled and experimental method |
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| CN201710383407.0A CN108931555A (en) | 2017-05-26 | 2017-05-26 | It is a kind of to realize the multifactor flue gas acid dew point experimental provision quantitatively controlled and experimental method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113311099A (en) * | 2021-05-07 | 2021-08-27 | 齐鲁工业大学 | Experimental device for condensation of mixed acid steam of boiler tail flue gas |
| CN114515537A (en) * | 2022-03-07 | 2022-05-20 | 北京科技大学 | Metallurgical converter modified flue gas collecting and distributing system for crop growth |
-
2017
- 2017-05-26 CN CN201710383407.0A patent/CN108931555A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113311099A (en) * | 2021-05-07 | 2021-08-27 | 齐鲁工业大学 | Experimental device for condensation of mixed acid steam of boiler tail flue gas |
| CN114515537A (en) * | 2022-03-07 | 2022-05-20 | 北京科技大学 | Metallurgical converter modified flue gas collecting and distributing system for crop growth |
| CN114515537B (en) * | 2022-03-07 | 2022-11-08 | 北京科技大学 | Metallurgical converter modified flue gas collecting and distributing system for crop growth |
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