CN106248720B - A kind of flue gas acid dew point on-line measurement device and method - Google Patents
A kind of flue gas acid dew point on-line measurement device and method Download PDFInfo
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- CN106248720B CN106248720B CN201610824443.1A CN201610824443A CN106248720B CN 106248720 B CN106248720 B CN 106248720B CN 201610824443 A CN201610824443 A CN 201610824443A CN 106248720 B CN106248720 B CN 106248720B
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/02—Investigating or analyzing materials by the use of thermal means by investigating changes of state or changes of phase; by investigating sintering
- G01N25/12—Investigating or analyzing materials by the use of thermal means by investigating changes of state or changes of phase; by investigating sintering of critical point; of other phase change
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Abstract
The present invention discloses a kind of flue gas acid dew point on-line measurement device and method, and in the device, B sections of rotating inner tube of A sections of rotating inner tube is connected by joinery and its construction, is placed in outer layer protection casing.External voltage is added in by electrode contacts on high resistive film, and weak current is generated；Simultaneously be passed through cooling air so that resistor disc is cooled to dew point hereinafter, when acid dew condensation make resistor disc electric conductivity enhance, to make electric current occur significant change, and with this determine acid dew condensation at the time of and temperature.The present invention uses the direct method of measurement, the influence that reduction dust and other correlative factors measure acid dew point to improve the speed and precision of dew point temperature measurements, be in time boiler safety, economical operation provides reliable control parameter.
Description
Technical field
The present invention is a kind of flue gas acid dew point on-line measurement device and method, belongs to the skill of boiler smoke on-line continuous monitoring
Art field.
Background technology
In boiler smoke recycling, H in flue gas2SO4Steam condensation is that the temperature of acid dew is known as acid dew point.In order to reduce pot
The heating surfaces such as economizer, air preheater are generally all arranged in boiler tail in stove heat loss due to exhaust gas.When these equipment and Gas phase Smoke
When the wall surface temperature of contact portion is less than flue gas acid dew point, dense H is just had2SO4Solution condenses in wall surface, to metal
Heavy corrosion is caused, the safe operation of boiler is jeopardized.Low-temperature corrosion can be prevented by improving exhaust gas temperature, but reduce boiler
The thermal efficiency.The economy of boiler, the exhaust gas temperature of safety should control in some region of a little higher than flue gas acid dew point.
Inspection information finds dust in the big main cause of many measurement method measurement result dispersion degrees or coal-burning boiler
Content is too high.A large amount of dust has just been covered in the front sensor for measuring acid dew point, sensor is impacted, is hindered significantly
The accurate measurement of acid dew point is hindered.Many instruments can not achieve on-line continuous monitoring, make feedback not in time.So key is to gather around
Have under sensitive measurement of inductance system, can accomplish timely dedusting and on-line continuous measures acid dew point.
Invention content
Technical problem：The object of the present invention is to provide a kind of flue gas acid dew point on-line measurement device and method, using direct
Mensuration reduces the influence of dust and other correlative factors, improves the speed and precision of dew point temperature measurements, be in time boiler
Safety, economical operation provide reliable control parameter, achieve the purpose that not only energy saving but also low-temperature corrosion do not occur.
Technical solution：The present invention uses the direct method of measurement, and dust is reduced to dew point measurement using sintering metal dedusting guard
Influence.Probe designs are that separable inner and outer pipes are rotary, it can be achieved that continuous measure.Measured value client is remembered using curvilinear motion
Instrument is recorded, convenient for observation.External voltage is added in by electrode contacts on high resistive film, and weak current is generated；It is passed through cooling simultaneously
Air makes resistor disc cool to dew point hereinafter, when acid dew condensation makes resistor disc electric conductivity enhance, to make electric current that apparent become occur
Change, and with this determine acid dew condensation at the time of and temperature.
In order to solve the above technical problems, the present invention provides a kind of flue gas acid dew point on-line measurement device and method, flue gas acid
The structure of dew point on-line measurement device is：
Resistor disc fits to the inner end of A sections of rotating inner tube, and thermocouple is inserted into the thermocouple hole in A sections of rotating inner tube, leads
Line is connected on electrode contacts；And B sections of A sections of rotating inner tube and rotating inner tube are fastened by joinery and its construction, it is combined into interior
Pipe；
The inner tube combined is inserted into outer layer protection casing, is made on scale and the outer layer protection casing in rotating inner tube B sections
Scale alignment, and make A sections of catch for withstanding outer layer protection casing front end of rotating inner tube, tighten fastening bolt and be allowed to fixed；
Micropore dedusting guard is fixed by screw thread and outer layer protection casing, composition probe；Cooling air is blown into pipeline
One end is inserted into the probe, and the other end controls to adjust valve, flowmeter B and pressure by the thick control regulation valve B of gas flow, temperature
The B connections of contracting cooling air source；One end of snorkel is inserted into the probe, the other end by the thick control regulation valve A of gas flow,
Flowmeter A, four-way regulating valve are connect with compression cooling air source A；Hot wire and ampere wires that inner tube is drawn are connected respectively
It is connected on moisture recorder and galvo-recorder.
The resistor disc is made by material of the resistance value more than 1k Ω and is designed as fan-shaped flake structure, rotating inner tube
A sections are made of insulating materials, and A sections of rotating inner tube, B sections of rotating inner tube are connected by joinery and its construction.
A sections of the rotating inner tube has positioned at the dual-purpose pipe hole of the perforative pressure-vaccum in middle, can with rubber tube will pop one's head in
Cooling air be blown into cooling air and be blown into pipeline, blown out from cooling air blow pipe；Have beside resistance film trap hollow
Gas chamber is fan-shaped and is angularly distributed that side is evenly equipped with metallic channel and is inserted into heat for cooling air circulation, the resistance film trap of front end
The hole of galvanic couple.
A kind of On-line Measuring Method of flue gas acid dew point on-line measurement device of the present invention is：
Step 1: first being preheated to probe, then the probe combined is integrally inserted into flue, opens power supply
Switch and record current value at this time charged to resistor disc；It opens the thick control regulation valve A of gas flow and gas flow slightly controls adjusting
The registration variation of valve B, observation flowmeter A, flowmeter B and moisture recorder；
Step 2: when the jump variation of apparent ladder occurs for galvo-recorder registration, record temperature registration at this time and
Time continues observation a period of time as the first group observations；
Step 3: after the first group observations of record, closes the thick control regulation valve A of gas flow and gas flow slightly controls adjusting
Valve B, unscrews tight fixed bolt, and probe inner tube is rotated to next scale and tightens tight fixed bolt after being aligned；Open four-way regulating valve and
The thick control regulation valve A of gas flow realizes blowback, later, closes four-way regulating valve and opens the thick control regulation valve B of gas flow, continue
Observe each instrument numerical value change；
Step 4: when galvo-recorder registration significant change such as step 2 record the second group observations, repeat step 3
Until resistor disc is finished, taking out probe dismounting and change high resistive film can remeasure, and be compared and be averaged to observation
Value, acid dew-point temperature is obtained after amendment.
Wherein：
Outer layer protection internal surface of sleeve pipe mentioned in step 2 is coated with insulation material layer；Have with tail end among rotating inner tube
The shaft shoulder and gasket have certain scope of activities when it being made to be fixed with outer tube.
Micropore dedusting guard mentioned in step 3 is formed by metal sintering, and aperture is micron order.
Preheating temperature is higher than dew-point temperature at 150 DEG C or so in step 1.
Probe designs are separable rotary, and also instant fill can directly be welded described in step 1.Inner tube tail end-side
Face is provided with bolt notch, and there is baffle ring in outer tube front end, and fan-shaped ventilation opening is provided on baffle ring, and outer tube is solid with interior effective tight fixed bolt
It is fixed.
Advantageous effect：
1. using the direct method of measurement, dew-point temperature is timely feedbacked.
2. using sintered porous metal material dedusting, the influence of dust is reduced, improves precision.
3. cooling air cools down, convenient for adjusting.
4. having blowing function, dust accretions are solved the problems, such as.
5. probe designs are detachable, it is convenient for changing, there is certain economy；It is designed as rotatably, it can be multiple
It measures, improves efficiency.
Description of the drawings
Fig. 1 is a kind of schematic diagram of flue gas acid dew point on-line measurement device and method.
In figure：Rotating inner tube A sections 1, micropore dedusting guard 2, electrode contacts 3, high resistive film 4, thermocouple 5, cooling air
It is blown into the dual-purpose pipeline 7 of pipeline 6, pressure-vaccum, cooling air blow pipe 8, outer layer protection casing 9, rotating inner tube B sections 10, clamp screw
The thick control regulation valve B15 of bolt 11, washer 12, moisture recorder 13, galvo-recorder 14, gas flow, temperature control to adjust valve 16,
Flowmeter B17, compression cooling air source B18, compression cooling air source A19, four-way regulating valve 20, flowmeter A21, gas flow
Thick control regulation valve A22.
Specific implementation mode
The present invention is done with reference to embodiment and attached drawing and is further explained.Following embodiments do not limit in any form
The system present invention, all technical solutions obtained by the way of equivalent substitution or equivalent transformation are in the protection model of the present invention
Among enclosing.
The flue gas acid dew point on-line measurement device and measurement method of the present invention, as shown in Figure 1, including following content：
Step 1: -276 resistor disc of Hastelloy C alloys of resistance value up to 1K Ω or more are fitted to corresponding in rotating inner tube A sections
In slot, the thermocouple of diameter 4mm is inserted into the thermocouple hole in A sections of rotating inner tube, and the conducting wire of diameter 1mm or so is connected to rotation
Turn on the electrode contacts in A sections of outside notches of inner tube；And B sections of A sections of rotating inner tube and rotating inner tube are fastened by joinery and its construction
It is fixed, it is combined into inner tube；The inner tube combined is inserted into outer layer protection casing, the scale and outer layer in rotating inner tube B sections are made
Scale alignment in protection sleeve pipe, and make A sections of catch for withstanding outer layer protection casing front end of rotating inner tube, tightening fastening bolt makes
Fixation；Micropore dust removal and filtration guard made of titanium is sintered is fixed by screw thread and outer layer protection casing, is combined into probe；
Step 2: one end that cooling air is blown into pipeline is inserted into probe, the other end slightly controls adjusting by gas flow
Valve B, temperature control to adjust valve, flowmeter B is connect with compression cooling air source B；One end of snorkel is inserted by interstitial hole and is visited
In head, the other end is connect by the thick control regulation valve A of gas flow, flowmeter A, four-way regulating valve with compression cooling air source A；It will
The hot wire and ampere wires that inner tube is drawn are connected respectively on moisture recorder and galvo-recorder.
Step 3: being preheated to probe, its temperature is set to reach 150 DEG C or so (being higher than dew-point temperature), preheating terminates vertical
It is inserted into exhaust gases passes.Turn on the power switch and record current value at this time charged to resistor disc；Gas flow is opened slightly to control
The registration of the regulating valve A and thick control regulation valve B of gas flow, Continuous aeration, observation flowmeter A, flowmeter B and moisture recorder becomes
Change.
Step 4: when the jump variation of apparent ladder occurs for galvo-recorder registration, record temperature registration at this time and
Moment continues observation a period of time as the first group observations, and the temperature that the significant change moment occurs for electric current is considered sour dew
Point；
Step 5: after the first group observations of record, closes the thick control regulation valve A of gas flow and gas flow slightly controls adjusting
Valve B, unscrews tight fixed bolt, and probe inner tube is rotated to next scale and tightens tight fixed bolt after being aligned；Open four-way regulating valve and
The thick control regulation valve A of gas flow realizes blowback, later, closes four-way regulating valve and opens the thick control regulation valve B of gas flow, continue
Ventilation continues to observe each instrument numerical value change.
Step 6: when galvo-recorder registration significant change such as step 2 record the second group observations, repeat step 3
Until resistor disc is finished, taking out the new resistor disc of probe dismounting and change can remeasure, and be compared and make even to observation
Mean value obtains acid dew-point temperature after amendment.
Claims (8)
1. a kind of flue gas acid dew point on-line measurement device, which is characterized in that the structure of the device is：
Resistor disc (4) fits to the front end of rotating inner tube A sections (1), and thermocouple (5) is inserted into the thermocouple in A sections of rotating inner tube (1)
In hole, conducting wire is connected on the electrode contacts (3) of resistor disc (4)；And it is rotating inner tube A sections (1) and B sections of rotating inner tube (10) is logical
It crosses joinery and its construction to be fastened, is combined into inner tube；
The rotating inner tube combined is inserted into outer layer protection casing (9), makes the scale and outer layer protection on B sections of rotating inner tube (10)
Scale alignment on casing (9), and rotating inner tube A sections (1) is made to withstand the catch of outer layer protection casing (9) front end, tighten fastening
Bolt (11) keeps outer layer protection casing (9) fixed；
, the composition probe fixed by screw thread and outer layer protection casing (9) by micropore dedusting guard (2)；Cooling air is blown into pipeline
(6) one end is inserted into the probe, and the other end controls to adjust valve by the thick control regulation valve B (15) of gas flow, temperature
(16), flowmeter B (17) is connect with compression cooling air source B (18)；One end of snorkel (7) is inserted into the probe, separately
One end passes through the thick control regulation valve A (22) of gas flow, flowmeter A (21), four-way regulating valve (20) and compression cooling air source A
(19) it connects；The hot wire and ampere wires drawn from inner tube are connected respectively to moisture recorder (13) and galvo-recorder
(14) on.
2. a kind of flue gas acid dew point on-line measurement device according to claim 1, which is characterized in that the resistor disc by
Material of the resistance value more than 1k Ω makes and is designed as fan-shaped flake structure, and A sections of rotating inner tube is made of insulating materials, rotation
A sections of inner tube, B sections of rotating inner tube are connected by joinery and its construction.
3. a kind of flue gas acid dew point on-line measurement device according to claim 1, which is characterized in that the rotating inner tube
A sections have positioned at the dual-purpose pipe hole of the perforative pressure-vaccum in middle, the cooling air in probe can be blown into cooling air with rubber tube
It is blown into pipeline (6), is blown out from cooling air blow pipe (8)；There is free motive room for cooling air stream beside resistance film trap
Logical, the resistance film trap of front end is fan-shaped and is angularly distributed, and side is evenly equipped with metallic channel and is inserted into the hole of thermocouple.
4. a kind of a kind of On-line Measuring Method of flue gas acid dew point on-line measurement device as described in profit requires 1, which is characterized in that
Step 1: first being preheated to probe, then the probe combined is integrally inserted into flue, is turned on the power switch
And record current value at this time charged to resistor disc；It opens the thick control regulation valve A (22) of gas flow and gas flow slightly controls adjusting
The registration variation of valve B (15), observation flowmeter A (21), flowmeter B (17) and moisture recorder (13)；
Step 2: when the jump variation of apparent ladder occurs for galvo-recorder (14) registration, record temperature registration at this time and
Time continues observation a period of time as the first group observations；
Step 3: after the first group observations of record, closes the thick control regulation valve A (22) of gas flow and gas flow slightly controls adjusting
Valve B (15) unscrews fastening bolt (11), and rotating inner tube is rotated to next scale and tightens fastening bolt after being aligned；Open four-way
Regulating valve and the thick control regulation valve A (22) of gas flow realize blowback, later, close four-way regulating valve (20) and open gas flow
Thick control regulation valve B (15), continues to observe each instrument numerical value change；
Step 4: when galvo-recorder registration significant change such as step 2 record the second group observations, repeat step 3 until
Resistor disc is finished, and taking out probe dismounting and change high resistive film (4) can remeasure, and be compared and be averaged to observation
Value, acid dew-point temperature is obtained after amendment.
5. a kind of flue gas acid dew point on-line measurement device according to claim 1, which is characterized in that the outer layer protection
Casing (9) inner wall is coated with insulation material layer；Among rotating inner tube and tail end has the shaft shoulder and gasket to make itself and outer layer protection casing
There is certain scope of activities when fixed.
6. a kind of flue gas acid dew point on-line measurement device according to claim 1, which is characterized in that the micropore dedusting
Guard (2) is formed by metal sintering, and aperture is micron order.
7. a kind of On-line Measuring Method of flue gas acid dew point on-line measurement device according to claim 4, which is characterized in that
Preheating temperature is higher than dew-point temperature at 150 DEG C or so in step 1.
8. a kind of On-line Measuring Method of flue gas acid dew point on-line measurement device according to claim 4, which is characterized in that
Probe is separable rotary, and B sections of (10) tail end sides of rotating inner tube are provided with bolt notch, and outer layer protection casing (9) front end has
Catch is provided with fan-shaped ventilation opening on catch, and B sections of rotating inner tube (10) is fixed with outer layer protection casing (9) with fastening bolt.
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| CN201610824443.1A CN106248720B (en) | 2016-09-14 | 2016-09-14 | A kind of flue gas acid dew point on-line measurement device and method |
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| CN201610824443.1A CN106248720B (en) | 2016-09-14 | 2016-09-14 | A kind of flue gas acid dew point on-line measurement device and method |
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| CN106248720B true CN106248720B (en) | 2018-10-12 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107037082B (en) * | 2017-06-07 | 2019-10-18 | 中石化炼化工程（集团）股份有限公司 | A kind of acid dew point detection device and method |
| CN107764861B (en) * | 2017-09-30 | 2020-02-14 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Correction method for dew point instrument in plateau area |
| CN108225854B (en) * | 2017-12-29 | 2020-03-31 | 江苏汇环环保科技有限公司 | VOC on-line monitoring double-pump negative pressure sampling system |
| CN113834854B (en) * | 2021-09-23 | 2023-12-29 | 上海轻叶能源股份有限公司 | Acid dew point temperature monitoring system for air bath flue gas |
| CN117491425B (en) * | 2024-01-03 | 2024-03-08 | 东方华瑞(成都)科技开发有限责任公司 | Detection device for flue gas acid dew point |
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