CN208937524U - A kind of online flue gas dew point monitoring device - Google Patents
A kind of online flue gas dew point monitoring device Download PDFInfo
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- CN208937524U CN208937524U CN201820693413.6U CN201820693413U CN208937524U CN 208937524 U CN208937524 U CN 208937524U CN 201820693413 U CN201820693413 U CN 201820693413U CN 208937524 U CN208937524 U CN 208937524U
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- dew point
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Abstract
A kind of online flue gas dew point monitoring device, the monitoring device is mainly made of proportioning valve, measuring probe, PLC regulator control system, the PLC regulator control system reaches probe conducting, generates electric current by the compressed air require of the cooling measuring probe internal probe of adjusting ratio valve regulation；Regulator control system measures detecting probe surface temperature at this time, the as real-time acid dew-point temperature of flue gas by being built in the Pt100 thermal resistance at probe simultaneously.The utility model has regulator control system realization to automatically control the on-line real time monitoring, it can be achieved that flue gas dew point temperature completely, and then provides reference to prevent flue gas waste heat recovery equipment from dew point corrosion occurs.The waste-heat recovery device of the online dew point monitoring device particularly suitable for sulfur-containing smoke gas.
Description
Technical field
The utility model belongs to heat recovery technology field, is related to a kind of online flue gas dew point monitoring device.
Background technique
Sulfur-containing smoke gas is mainly the acid waste gas combustion product that upstream device generates, wherein containing a certain amount of SO3, pole
Easily H is formed with the Water vapor condensation in flue gas2SO4Steam, when the metallic surface temperature of waste heat recovery apparatus heat transfer element is close or
Lower than H2SO4When the adiabatic condensation temperature of steam, H2SO4Steam is condensed in metal surface, metal erosion is caused, to limit smoke evacuation
The reduction of temperature.
Under normal conditions, flue gas acid dew point range of temperature is smaller, and waste heat recovery apparatus design tube wall temperature is above
Dew point corrosion phenomenon will not occur for flue gas acid dew point temperature, equipment.But the SO when upstream device fluctuates, in flue gas3
Content changes, and acid dew-point temperature is caused to increase, and device operator can not obtain flue gas dew point temperature in time at this time, cannot
The effective tube wall temperature for adjusting waste-heat recovery device causes device to stop so that dew point corrosion occurs for equipment.Therefore, online
Continuous monitoring flue gas acid dew point temperature can provide important guarantee to the continuous safety in production of low-temperature flue gas waste heat recyclable device.
There are two types of methods for traditional acid dew point determination: theoretical calculation and the offline acid dew point instrument of use.Theoretical calculation passes through true
Determine the SO in flue gas3With the content of vapor, use experience formula carries out that flue gas acid dew point temperature is calculated.In usual flue gas
SO3Content measuring carries out sampling analysis using dedicated gas sampling system, to obtain SO3Concentration.The method test result
It is more accurate, but continuous mode is complicated for operation, heavy workload, time-consuming, can not accomplish real-time monitoring.
Offline acid dew point tester uses portable surveying instrument, by manually measuring to acid dew-point temperature.First can not
Realize the real-time monitoring to acid dew point；Secondly, measurement process is completed by manual operation, measurement accuracy not can guarantee, be unable to satisfy
The control accuracy requirement of commercial plant, the practicability is poor.
Patent 201220172563.5 proposes a kind of on-line continuous monitoring coal-burning boiler tail flue gas acid dew point device, needs
Flue gas is introduced into external device (ED) and is measured, can theoretically realize the on-line monitoring to flue gas acid dew point, but external dress
It sets that structure is complicated, is influenced by external environmental factor, practicability is poor, cannot achieve popularization and application.
To solve the above problems, the utility model proposes a kind of online flue gas dew point monitoring device, entire measurement process is complete
Cheng Wuxu is manually participated in, and measurement accuracy is high, can fundamentally be solved current waste heat recovery apparatus dew-point temperature monitoring and be deposited
The above problem.
Utility model content
The utility model provides a kind of online flue gas dew point monitoring device, can be realized to low temperature exhaust heat recyclable device
The real-time dew point monitoring of sulfur-containing smoke gas, and entire monitoring process Automatic Control, without manual intervention, measurement accuracy is high, and reaction is fast.
The technology employed by the present utility model is
A kind of online flue gas dew point monitoring device, the monitoring device is mainly by proportioning valve, measuring probe, PLC regulator control system
Composition, the PLC regulator control system reach probe by the compressed air require of the cooling measuring probe internal probe of adjusting ratio valve regulation
Conducting generates electric current；Regulator control system measures detecting probe surface temperature at this time by being built in the Pt100 thermal resistance at probe simultaneously,
The as real-time acid dew-point temperature of flue gas.
The measuring probe includes coaxial mounted probe outer cylinder, probe inner cylinder；Built-in Pt100 is installed in the probe inner cylinder
Upside probe, the downside probe of thermal resistance；Have between the upside probe, downside probe gap and both with probe Continuity signal
Cable, Pt100 thermal resistance signal cable connection；The probe outer cylinder is equipped with compressed air outlet, and sets on inner cylinder of popping one's head in
There is compressed air to be distributed mouth；The side that is relatively distant from of the upside probe and downside probe is equipped with compressed air inlet pipeline.
Gap between the upside probe, downside probe is 0.5 ~ 1.0mm.
The upside probe, downside probe are rectangular flat plate formula structure, have multiple probes thereon.
The monitoring device includes stop valve, and the regulator control system periodically opens stop valve, makes low-pressure steam by being placed in
Low-pressure steam purge system between probe implements the cleaning to probe.
The low-pressure steam purge system includes the steam blowing pipeline being placed between upside probe and downside probe, the steaming
Steam-distributing pipe is installed in the exit of vapour blow line, and steam jet is arranged on the steam-distributing pipe.
The positive effect of the utility model is: the online dew point monitoring device can be low with newly-built or reconstruction sulfur-containing smoke gas
Warm waste-heat recovery device matches, to scrap build amount very little, and can real-time monitoring flue gas acid dew point temperature, in time adjust
The tube wall temperature of whole low temperature exhaust heat recyclable device prevents equipment from dew point corrosion occurs.Secondly, the online dew point monitoring device is whole
It automatically controls, is not necessarily to manual intervention, and there is self-cleaning function, realizes substantially non-maintaining, improve the reliability of equipment, guarantee
Long-term operation.
The utility model can be used for the various sulfur-containing smoke gas waste heat recycling occasions of the industrial departments such as petroleum, chemical industry, metallurgy, realize
To the real-time monitoring of flue gas acid dew point.
Detailed description of the invention
Fig. 1 is the utility model principle figure；
Fig. 2 is the utility model measuring probe structural schematic diagram；
Fig. 3 is the side view of Fig. 2；
Fig. 4 is the utility model measuring probe steam purge system schematic diagram.
Specific embodiment
The utility model is furtherd elucidate below by case study on implementation, and in conjunction with attached drawing, but the utility model is not merely
It is confined to cited case study on implementation.
As shown in Figure 1, a kind of online flue gas dew point monitoring device, the monitoring device mainly by proportioning valve, measuring probe,
PLC regulator control system composition, the compressed air stream which passes through the cooling measuring probe internal probe of adjusting ratio valve regulation
Amount reaches probe conducting, generates electric current；Regulator control system is measured by being built in the Pt100 thermal resistance at probe and is visited at this time simultaneously
Wire surface temperature, the as acid dew-point temperature of flue gas realize the real-time monitoring to flue gas acid dew point.Further, which fills
It sets including stop valve, the PLC regulator control system periodically opens stop valve, steams low-pressure steam by the low pressure being placed between probe
Vapour purge system, implementation reach self-cleaning function to the cleaning of probe.
The course of work of the utility model is: firstly, measuring probe need to be mounted on low temperature exhaust heat recyclable device or sulfur-bearing cigarette
On the flue of gas, it is ensured that measuring probe can directly be contacted with flue gas；Secondly, regulator control system is cooling by the valve regulation of adjusting ratio
The compressed air require of measuring probe internal probe is visited at this time so that detecting probe surface temperature is reduced to flue gas acid dew point adiabatic condensation temperature
Needle conducting, generates electric current；Third, regulator control system measure detecting probe surface temperature at this time by being built in the Pt100 thermal resistance at probe
Degree, the as acid dew-point temperature of flue gas.4th, to guarantee detecting probe surface cleaning, measurement is accurate, which is internally provided with low pressure
Steam purge system can periodically purge detecting probe surface.
The utility model is further illustrated below by specific embodiment.
As shown in Figure 2 and Figure 3, the measuring probe includes coaxial mounted probe outer cylinder 1, probe inner cylinder 2；In the probe
Upside probe 3, the downside probe 4 of built-in Pt100 thermal resistance are installed in cylinder 2；There is gap between the upside probe 3, downside probe 4
And it is both connected with probe Continuity signal cable 9, Pt100 thermal resistance signal cable 10；The probe outer cylinder 1 is equipped with compression
Air outlet 8, and inner cylinder 2 of popping one's head in is distributed mouth 7 equipped with compressed air；The upside probe 3 and downside probe 4 it is relatively remote
Compressed air inlet pipeline 5 is installed from side.
Gap between the upside probe 3, downside probe 4 is 0.5 ~ 1.0mm, can guarantee acid dew shape in a short time
At, and be not easy to be blocked by cigarette ash dirt, it is convenient for steam blowing, is made of sulfuric acid corrosion resistant material.
The upside probe 3, downside probe 4 are rectangular flat plate formula structure, have multiple probes thereon, more by being arranged
Measurement precision is improved in a contact point, shortens time of measuring.
The specific measurement process of measuring probe are as follows: firstly, compressed air is entered after ratio valve regulation by compressed air
5 pairs of upside probes 3 of mouth pipeline and 4 inner surface of downside probe cool down, and compressed air after cooling is distributed mouth 7 by compressed air
Outflow is discharged after mixing in the cavity between outer cylinder 1 and inner cylinder 2 of popping one's head in of popping one's head in by compressed air outlet 8；Secondly, when upper
It is formed between 4 outer surface of side probe 3 and downside probe after condensing acid dewdrop, upper and lower two sides probe conducting, current signal passes through
Probe Continuity signal cable 9 is transmitted to regulator control system.At the same time, the Pt100 thermal resistance at probe is built in measure at probe
Temperature, spread out of through Pt100 thermal resistance signal cable 10, which is the online real-time acid dew-point temperature of flue gas at this time.
As shown in figure 4, the low-pressure steam purge system includes the steam being placed between upside probe 3 and downside probe 4
Steam-distributing pipe 11 is installed in blow line 6, the exit of the steam blowing pipeline 6, and setting steam sprays on the steam-distributing pipe 11
Mouth 12.Specific regulation process are as follows: PLC regulator control system periodically opens stop valve, after low-pressure steam passes through steam blowing pipeline 6, warp
By the distribution of steam-distributing pipe 11 to each steam jet 12, probe outer surface flue dust is purged, guarantees probe measurement
Accuracy.
The utility model proposes a kind of online flue gas dew point monitoring device, have that measurement accuracy is high, full-automatic prison in real time
The advantages that survey, automatically cleaning, at the same it is minimum to low temperature exhaust heat reclaimer change amount, structure is simple, and it is easy to accomplish, have extensive
Application value.
Claims (5)
1. a kind of online flue gas dew point monitoring device, it is characterised in that: the monitoring device is mainly by proportioning valve, measuring probe, PLC
Regulator control system composition, the PLC regulator control system pass through the compressed air require of the cooling measuring probe internal probe of adjusting ratio valve regulation,
Reach probe conducting, generates electric current；Regulator control system measures probe table at this time by being built in the Pt100 thermal resistance at probe simultaneously
Face temperature, the as real-time acid dew-point temperature of flue gas；In the measuring probe includes coaxial mounted probe outer cylinder (1), pops one's head in
Cylinder (2)；Upside probe (3), the downside probe (4) of built-in Pt100 thermal resistance are installed in the probe inner cylinder (2)；The upside probe
(3), have between downside probe (4) gap and both with probe Continuity signal cable (9), Pt100 thermal resistance signal cable
(10) it connects；The probe outer cylinder (1) is equipped with compressed air outlet (8), and inner cylinder of popping one's head in (2) is equipped with compressed air point
Cloth mouth (7)；The side that is relatively distant from of the upside probe (3) and downside probe (4) is equipped with compressed air inlet pipeline (5)；It visits
Needle Continuity signal cable (9), Pt100 thermal resistance signal cable (10) the other end connected with PLC regulator control system.
2. a kind of online flue gas dew point monitoring device according to claim 1, it is characterised in that: the upside probe (3),
Gap between downside probe (4) is 0.5 ~ 1.0mm.
3. a kind of online flue gas dew point monitoring device according to claim 2, it is characterised in that: the upside probe (3),
Downside probe (4) is rectangular flat plate formula structure, has multiple probes thereon.
4. a kind of online flue gas dew point monitoring device according to claim 1, it is characterised in that: the monitoring device includes cutting
Disconnected valve, the regulator control system periodically open stop valve, make low-pressure steam by the low-pressure steam purge system that is placed between probe,
Implement the cleaning to probe.
5. a kind of online flue gas dew point monitoring device according to claim 4, it is characterised in that: the low-pressure steam purging
System includes the steam blowing pipeline (6) being placed between upside probe (3) and downside probe (4), the steam blowing pipeline (6)
Steam-distributing pipe (11) are installed in exit, and steam jet (12) are arranged on the steam-distributing pipe (11).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820693413.6U CN208937524U (en) | 2018-05-10 | 2018-05-10 | A kind of online flue gas dew point monitoring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820693413.6U CN208937524U (en) | 2018-05-10 | 2018-05-10 | A kind of online flue gas dew point monitoring device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208937524U true CN208937524U (en) | 2019-06-04 |
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ID=66714322
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820693413.6U Active CN208937524U (en) | 2018-05-10 | 2018-05-10 | A kind of online flue gas dew point monitoring device |
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| Country | Link |
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| CN (1) | CN208937524U (en) |
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2018
- 2018-05-10 CN CN201820693413.6U patent/CN208937524U/en active Active
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