CN209148055U - A kind of temperature control heat tracing Pitot tube - Google Patents
A kind of temperature control heat tracing Pitot tube Download PDFInfo
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- CN209148055U CN209148055U CN201920075163.4U CN201920075163U CN209148055U CN 209148055 U CN209148055 U CN 209148055U CN 201920075163 U CN201920075163 U CN 201920075163U CN 209148055 U CN209148055 U CN 209148055U
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Abstract
A kind of temperature control heat tracing Pitot tube, belongs to flue gas inspection equipment technical field.Heating film and insulating layer are successively enclosed with outside the total pressure test tube and back pressure test tube of the temperature control heat tracing Pitot tube respectively, thermal insulation layer is enclosed with outside the insulating layer of total pressure test tube and back pressure test tube jointly, the outside of thermal insulation layer is equipped with protection outer housing, the side wall that at least one temp probe passes through protection outer housing protrudes into thermal insulation layer, the measurement end of temp probe is close to the position that the insulating layer of total pressure test tube and back pressure test tube contacts with each other, the one end of total pressure connector far from total pressure test tube, the one end of one end and temp probe far from its measurement end of back pressure connector far from back pressure test tube is connect with online monitoring instruments.The temperature control heat tracing Pitot tube, temperature in Pitot tube can be maintained 80 DEG C or more, solve Pitot tube etching problem caused by due to condensation, online monitoring instruments have the function of purging, the solid particulate matter impurity in discharge gas can be effectively removed, the blockage problem of Pitot tube is efficiently solved.
Description
Technical field
The utility model relates to flue gas inspection equipment technical field, in particular to a kind of temperature control heat tracing Pitot tube.
Background technique
In flue gas inspection work, Pitot tube is one of most common Sampling device in detection sample devices.It will when measurement
In Pitotmeter probe insertion pipeline, and total pressure and back pressure center probe axis is made to be in flow section center and and streamline
Direction is consistent, and incoming flow is coped in total pressure probe gaging hole front, detects fluid stagnation pressure, and pass it to monitoring system；Back pressure simultaneously
Probe gaging hole pickup is throttling pressurized also to pass it to monitoring system, and monitoring system reads total, static pressure, finds out dynamic pressure and static pressure
Difference calculates flow velocity numerical value using formula.
It, not only can be rotten but due to containing various gas componants, such as vapor, sulfur dioxide, nitrogen oxides etc. in flue gas
Pitot tube is lost, and the blocking of Pitot tube will cause due to the condensation of gas when temperature is lower, influences the accuracy of detection.
So the corrosion of Pitot tube and blockage problem are two hang-ups anxious to be resolved in flow velocity measurement.It is commonly used in flow velocity at present
The Pitot tube of measurement, total pressure and back pressure pipe generally are solved to corrode and be ground in such a way that stainless steel material adds stainless steel sheath
Damage problem, but for blockage problem, there are no relatively good solutions.
Summary of the invention
It is of the existing technology in order to solve the problems, such as, the purpose of the utility model is to provide a kind of temperature control heat tracing Pitot tube,
Temperature in Pitot tube can be maintained 80 DEG C or more, solve Pitot tube etching problem caused by due to condensation, it is online to supervise
Surveying instrument has the function of purging, can effectively remove the solid particulate matter impurity in discharge gas, efficiently solve Pitot tube
Blockage problem.
To achieve the goals above, the technical solution of the utility model is:
A kind of temperature control heat tracing Pitot tube, including total pressure test tube and back pressure test tube, one end of the total pressure test tube connect with total pressure
Head connection, the other end of total pressure test tube are provided with total pressure gaging hole, and one end of the back pressure test tube is connect with back pressure connector, and back pressure is surveyed
The other end of pipe is provided with back pressure gaging hole, is successively enclosed with heating film and insulation outside the total pressure test tube and back pressure test tube respectively
Thermal insulation layer is enclosed with outside the insulating layer of layer, total pressure test tube and back pressure test tube jointly, the outside of the thermal insulation layer is equipped with protection shell
Body, the side wall that at least one temp probe passes through protection outer housing protrude into thermal insulation layer, and the measurement end of temp probe is close to total pressure
The position that the insulating layer of test tube and back pressure test tube contacts with each other, one end far from total pressure test tube of the total pressure connector, back pressure connector
The one end of one end and temp probe far from its measurement end far from back pressure test tube is connect with online monitoring instruments.
The outside of the online monitoring instruments is equipped with temperature indicator, pressure display unit, total pressure interface, back pressure interface, temperature
Probe interface and source purge gas interface are spent, online monitoring instruments are internally provided with pressure difference transmitter one, pressure difference transmitter two, meter
When device one, timer two, timer three, timer four, solenoid valve one, solenoid valve two, solenoid valve three and solenoid valve four, the temperature
Degree probe is connect far from one end of its measurement end with temp probe interface, and temp probe interface is connect with temperature indicator, described
The one end of total pressure connector far from total pressure test tube is connect with total pressure interface, and total pressure interface is defeated by pipeline three and pressure difference transmitter one
Enter end connection, the pipeline three be equipped with solenoid valve three and timer three, the one end of the back pressure connector far from back pressure test tube with
The connection of back pressure interface, back pressure interface are connect by pipeline four with the input terminal of pressure difference transmitter two, and the pipeline four is equipped with electricity
Magnet valve four and timer four, the output end of pressure difference transmitter one and the output end of pressure difference transmitter two connect with pressure display unit
Connect, one end of the source purge gas interface is connect with external air source, the other end of source purge gas interface pass through simultaneously pipeline one with
Pipeline tee joint is connected to by pipeline two with pipeline four, and the pipeline one is equipped with solenoid valve one and timer one, on pipeline two
Equipped with solenoid valve two and timer two.
The solenoid valve three and timer three are respectively positioned between the junction of pipeline one and pipeline three and pressure difference transmitter one,
The solenoid valve four and timer four are respectively positioned between the junction of pipeline two and pipeline four and pressure difference transmitter two.
The heating film is Kapton PI Electric radiant Heating Film.
The insulating layer is silicon rubber, asbestos or micarex.
The thermal insulation layer is glass fibre guard glass fibre cotton, polyurethane foam material or rock wool.
The utility model has the beneficial effects that
(1) temperature control heat tracing Pitot tube heats total pressure test tube and back pressure test tube using heating film, guarantees that flue gas will not
State in condensation prevents the corrosion and blocking of total pressure test tube and back pressure test tube, keeps flow measurement more accurate；
(2) temp probe is in close to the position that the insulating layer of total pressure test tube and back pressure test tube contacts with each other, can be simultaneously
Total pressure test tube and back pressure test tube temperature are monitored, to control the heater switch of heating film, the excessively high stopping of temperature according to set temperature
Heating film heating, the lower heater switch for opening heating film of temperature, in addition, flue gas is as a kind of more special medium, temperature
Range is likely to be breached higher temperature under 40-120 DEG C or so, particular case, and flue gas is condensed in low-temperature condition in order to prevent,
Temperature in Pitot tube can be maintained 80 DEG C or more by the utility model, solved the corrosion of Pitot tube caused by due to condensation and asked
Topic；
(3) online monitoring instruments are able to detect dynamic pressure in pipeline, static pressure and temperature, and can be carried out real time temperature monitoring, make
Flow velocity measurement is more accurate；
(4) online monitoring instruments have the function of purging, can effectively remove the solid particulate matter etc. contained in discharge gas
Impurity is further ensured that Pitot tube is not blocked, and can effectively solve the problem that the blockage problem of Pitot tube, increases the stability of measurement,
Reduce the service work of operation maintenance personnel；
(5) the temperature control heat tracing Pitot tube of the utility model can be widely applied for all kinds of environmental protections and clean room, mine
Well ventilation and energy management department, can gas flow rate to various boilers, stove flue and mine for air exhaustion pipeline, temperature, pressure
It is monitored on-line.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of temperature control heat tracing Pitot tube provided by the utility model；
Fig. 2 is the enlarged drawing of B in Fig. 1 provided by the utility model；
Fig. 3 is the sectional view along A-A in Fig. 1 provided by the utility model；
Fig. 4 is a kind of scheme of installation of temperature control heat tracing Pitot tube provided by the utility model；
Fig. 5 is the structural schematic diagram of online monitoring instruments provided by the utility model.
Wherein,
1, total pressure connector；2, back pressure connector；3, total pressure test tube；4, back pressure test tube；5, temp probe；6, outer housing is protected；
7, total pressure gaging hole；8, back pressure gaging hole；9, flue gas flow direction；10, heating film；11, insulating layer；12, thermal insulation layer；14, total pressure interface；
15, back pressure interface；16, source purge gas interface；17, temperature indicator；18-1, pressure difference transmitter one；18-2, pressure difference transmitter
Two；19-1, timer one；19-2, timer two；19-3, timer three；19-4, timer four；20, solenoid valve one；21, electric
Magnet valve two；22, solenoid valve three；23, solenoid valve four；24, pressure display unit；25, temp probe interface.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clear, complete description.In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, art
Language " installation ", " being provided with ", " connection " etc., shall be understood in a broad sense, such as " connection ", may be a fixed connection, and being also possible to can
Dismantling connection, or be integrally connected；It can be mechanical connection, be also possible to be electrically connected；It can be directly connected, can also pass through
Intermediary is indirectly connected, and can be the connection inside two elements.For the ordinary skill in the art, can have
Body situation understands the concrete meaning of above-mentioned term in the present invention.In the description of the present invention, it should be noted that
The orientation or positional relationship of the instructions such as term " one end ", " other end " is to be based on the orientation or positional relationship shown in the drawings, and is only
For ease of description the utility model and simplify description, rather than the device or element of indication or suggestion meaning must have it is specific
Orientation, be constructed and operated in a specific orientation, therefore should not be understood as limiting the present invention.In addition, term " one ",
" two ", " three ", " four " are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance.
Of the existing technology in order to solve the problems, such as, as shown in Figures 1 to 5, the utility model provides a kind of temperature control companion
Hot Pitot tube, including total pressure test tube 3 and back pressure test tube 4, one end of total pressure test tube 3 are connect with total pressure connector 1, total pressure test tube 3
The other end is provided with total pressure gaging hole 7, and one end of back pressure test tube 4 is connect with back pressure connector 2, and the other end of back pressure test tube 4 is provided with
Heating film 10 and insulating layer 11,3 He of total pressure test tube are successively enclosed with outside back pressure gaging hole 8, total pressure test tube 3 and back pressure test tube 4 respectively
Thermal insulation layer 12 is enclosed with outside the insulating layer 11 of back pressure test tube 4 jointly, the outside of thermal insulation layer 12, which is equipped with, protects outer housing 6, and at least one
The side wall that a temp probe 5 passes through protection outer housing 6 protrudes into thermal insulation layer 12, in the present embodiment, using a temp probe 5,
The measurement end of temp probe 5 close to the position that the insulating layer 11 of total pressure test tube 3 and the insulating layer 11 of back pressure test tube 4 contact with each other,
Total pressure connector 1 one end, back pressure connector 2 far from total pressure test tube 3 one end and temp probe 5 far from back pressure test tube 4 are far from its survey
The one end at amount end is connect with online monitoring instruments.
The outside of online monitoring instruments is equipped with temperature indicator 17, pressure display unit 24, total pressure interface 14, back pressure interface
15, temp probe interface 25 and source purge gas interface 16, online monitoring instruments are internally provided with one 18-1 of pressure difference transmitter, pressure
Poor two 18-2 of transmitter, one 19-1 of timer, two 19-2 of timer, three 19-3 of timer, four 19-4 of timer, solenoid valve one
20, solenoid valve 2 21, solenoid valve 3 22 and solenoid valve 4 23, the one end of temp probe 5 far from its measurement end connect with temp probe
Mouth 25 connects, and temp probe interface 25 is connect with temperature indicator 17, total pressure connector 1 one end and total pressure far from total pressure test tube 3
Interface 14 connects, and total pressure interface 14 is connect by pipeline three with the input terminal of one 18-1 of pressure difference transmitter, and pipeline three is equipped with electricity
Three 19-3 of magnet valve 3 22 and timer, the one end of back pressure connector 2 far from back pressure test tube 4 are connect with back pressure interface 15, back pressure interface
15 are connect by pipeline four with the input terminal of two 18-2 of pressure difference transmitter, and pipeline four is equipped with solenoid valve 4 23 and timer four
The output end of two 18-2 of output end and pressure difference transmitter of 19-4, one 18-1 of pressure difference transmitter are connect with pressure display unit 24,
One end of source purge gas interface 16 is connect with external air source, and the other end of source purge gas interface 16 is connected by pipeline one and pipeline three
It is logical, it is connected to and at the same time the other end of source purge gas interface 16 also passes through pipeline two with pipeline four, pipeline one is equipped with solenoid valve
One 20 and one 19-1 of timer, pipeline two are equipped with two 19-2 of solenoid valve 2 21 and timer.Solenoid valve 3 22 and timer three
19-3 is located between one 18-1 of junction and pressure difference transmitter of pipeline one and pipeline three, four 19- of solenoid valve 4 23 and timer
4 between pipeline two and two 18-2 of junction and pressure difference transmitter of pipeline four.
Heating film 10 is Kapton PI Electric radiant Heating Film.Insulating layer 11 is silicon rubber, asbestos or micarex, the present embodiment
In, micarex uses flexible micanite.Thermal insulation layer 12 is glass fibre guard glass fibre cotton, polyurethane foam material or rock wool.
In the present embodiment, online monitoring instruments have the function of temperature monitoring, pressure monitoring and purging three, can be real-time
The temperature of temperature control heat tracing Pitot tube is monitored, the pressure of total pressure gaging hole 7 and back pressure gaging hole 8 can irregularly remove 3 He of total pressure test tube
Solid particulate matter in back pressure test tube 4.External air source is compressed air, is blown by meter solenoid valve 1 and one 19-1 of timer control
The purging frequency for sweeping total pressure test tube 3 purges frequency by solenoid valve 2 21 and two 19-2 of timer control purging back pressure test tube 4.This
In embodiment, the HD-730 of 17 model SUHED of temperature indicator, two 18-2 of one 18-1 of pressure difference transmitter and pressure difference transmitter
Model be Suo Pumei MIK-6000, the XMT for the model Ou Wei that pressure is shown, 5 model star of temp probe ring production
MF-53-103-F-3950, the type of one 19-1 of timer, four 19-4 of two 19-2 of timer, three 19-3 of timer and timer
It number is the H7ET-BLM of SANTEN.
In the utility model, selecting correct installation site is that temperature control heat tracing Pitot tube is reliable, the premise that effectively runs, temperature
Control heat tracing Pitot tube installation quality has larger impact to its measurement accuracy, since temperature control heat tracing Pitot tube is according to full of round tube
Steady flow channel theory works, therefore selects that fluidised form wave should be easily caused far from Feng Ji ﹑ Fa Men ﹑ elbow etc. when measurement point
Dynamic position, and measurement point upstream should have the straight pipe of 3D~5D, to guarantee that measurement point flow section speed distribution regularities accord with
It closes and requires.In addition, noting also the following: 1. installation site should avoid smoke canal elbow and section position jumpy；②
The position of corrosion and pernicious gas should be avoided in installation site；3. installation point wants easy to reach, facilitate installation and maintenance channel
Safety；4. the arrangement of signal wire should avoid interfering with each other far from other electromagnetic equipments.
A kind of working principle of above-mentioned temperature control heat tracing Pitot tube is as follows:
As shown in figure 4, temperature control heat tracing Pitot tube is inserted into pipeline when measurement, and make total pressure gaging hole 7 and back pressure gaging hole 8
Central axis is in flow section center and consistent with flue gas flow direction 9, and 7 front reply incoming flow of total pressure gaging hole detects fluid total pressure,
It is connected by total pressure connector 1 with the total pressure interface 14 of online monitoring instruments, total pressure is passed into one 18-1 of pressure difference transmitter, is pressed
The total pressure value that poor one 18-1 of transmitter is measured is shown on pressure display unit 24；Back pressure gaging hole 8 picks up throttling back to incoming flow simultaneously
Static pressure is connected with the back pressure interface 15 of online monitoring instruments by back pressure connector 2, gives pressure difference transmitter two 18- Hydrostatic Transfer Device
2, the static pressure that two 18-2 of pressure difference transmitter is measured is shown on pressure display unit 24.In actual work, according to total pressure value and
Static pressure obtains dynamic pressure value, and dynamic pressure value, that is, total pressure value and static pressure difference, dynamic pressure value is related with flue gas flow rate, and flow velocity then moves greatly
Pressure value is big, and dynamic pressure value is zero when no flow velocity, thus according to Bernoulli equation, by dynamic pressure, flue gas constant, flue-gas temperature, skin
Trustship correction factor etc. calculates flow velocity numerical value.
As shown in figure 5, solid line is that pipeline connection indicates gas circuit, dotted line is conducting wire connection table timberline road.Online monitoring instruments
Other than the total pressure of measurement flue gas and static pressure, additionally it is possible to which the insulating layer 11 for measuring total pressure test tube 3 and back pressure test tube 4 contacts with each other
The temperature at position, temp probe 5 pick up temperature value, show on temperature indicator 17, operator is according to temperature indicator 17
The temperature of display compares the temperature of setting, and to control the switch of heating film 10, in the present embodiment, the temperature that display is shown is high
In being equal to 80 DEG C, the heater switch of heating film 10 is closed, the temperature that display is shown is lower than 80 DEG C, opens the heating of heating film 10
Switch solves the technical issues of Pitot tube caused by due to condensation corrodes to prevent flue gas from condensing in low-temperature condition.In addition, surveying
During amount, need aperiodically to be purged to clear up temperature control heat tracing Pitot tube.
There are two types of the online monitoring instruments operating modes of the utility model:
The first operating mode: temperature control heat tracing Pitot tube is in running order, opens solenoid valve 3 22 and solenoid valve 4 23,
It closes solenoid valve 1 and solenoid valve 2 21, flue gas successively passes through total pressure gaging hole 7, total pressure test tube 3, total pressure connector 1, total pressure interface
14, one 18-1 of solenoid valve 3 22 and pressure difference transmitter shows total pressure value on pressure display unit 24, while flue gas is successively by back
Gaging hole 8, back pressure test tube 4, back pressure connector 2, two 18-2 of back pressure interface 15, solenoid valve 4 23 and pressure difference transmitter are pressed, it is aobvious in pressure
Show and shows static pressure on device 24；
Second of operating mode: when clearing up temperature control heat tracing Pitot tube, it is electrically turn off magnet valve three and solenoid valve 4 23, is beaten
Open electromagnetic valve 1 and solenoid valve 2 21, compressed air pass through source purge gas interface 16, and a part of compressed air successively passes through electricity
Magnet valve 1, total pressure interface 14, total pressure connector 1, clear up total pressure test tube 3, meanwhile, another part compressed air successively passes through
Solenoid valve 2 21, back pressure interface 15, back pressure connector 2 are crossed, back pressure test tube 4 is cleared up.
When online monitoring instruments work, one 19-1 of timer is used to control the opening and closing of solenoid valve 1 to control total pressure test tube
3 purging frequency, two 19-2 of timer are used to control the opening and closing of solenoid valve 2 21 to control the purging frequency of back pressure test tube 4, originally
In embodiment, total pressure test tube 3 is identical with the purging frequency of back pressure test tube 4, purging frequency can depending on operating condition, as smoke moisture with
In the very low situation of particulate matter, it is primary generally to may be set to 4 hours purgings.Three 19-3 of timer is for controlling solenoid valve 3 22
Opening and closing and four 19-4 of timer be used to control the opening and closing of solenoid valve 4 23, when solenoid valve 1 and solenoid valve 2 21 are in and close
When state, just solenoid valve 3 22 and solenoid valve 4 23 are opened；Conversely, when solenoid valve 1 and solenoid valve 2 21 are in open shape
When state, just solenoid valve 3 22 and solenoid valve 4 23 are closed.
The above is only the preferred embodiment of the present invention, is not intended to limit the utility model, all practical at this
Within novel spirit and principle, any modification, equivalent replacement, improvement and so on should be included in the guarantor of the utility model
Within the scope of shield.
Claims (6)
1. a kind of temperature control heat tracing Pitot tube, including total pressure test tube and back pressure test tube, one end of the total pressure test tube and total pressure connector
Connection, the other end of total pressure test tube are provided with total pressure gaging hole, and one end of the back pressure test tube is connect with back pressure connector, back pressure test tube
The other end be provided with back pressure gaging hole, which is characterized in that heating is successively enclosed with outside the total pressure test tube and back pressure test tube respectively
It is enclosed with thermal insulation layer jointly outside the insulating layer of film and insulating layer, total pressure test tube and back pressure test tube, the outside of the thermal insulation layer is equipped with
Outer housing is protected, the side wall that at least one temp probe passes through protection outer housing protrudes into thermal insulation layer, the measurement end of temp probe
Close to the position that the insulating layer of total pressure test tube and back pressure test tube contacts with each other, one end far from total pressure test tube of the total pressure connector,
The one end of one end and temp probe far from its measurement end of back pressure connector far from back pressure test tube is connect with online monitoring instruments.
2. temperature control heat tracing Pitot tube according to claim 1, which is characterized in that the outside of the online monitoring instruments is equipped with
Temperature indicator, pressure display unit, total pressure interface, back pressure interface, temp probe interface and source purge gas interface, on-line computing model
Device be internally provided with pressure difference transmitter one, pressure difference transmitter two, timer one, timer two, timer three, timer four,
Solenoid valve one, solenoid valve two, solenoid valve three and solenoid valve four, the temp probe one end and temp probe far from its measurement end
Interface connection, temp probe interface are connect with temperature indicator, and the one end of the total pressure connector far from total pressure test tube connects with total pressure
Mouth connection, total pressure interface are connect by pipeline three with the input terminal of pressure difference transmitter one, and the pipeline three is equipped with solenoid valve three
With timer three, the one end of the back pressure connector far from back pressure test tube is connect with back pressure interface, back pressure interface by pipeline four with
The input terminal of pressure difference transmitter two connects, and the pipeline four is equipped with solenoid valve four and timer four, pressure difference transmitter one it is defeated
The output end of outlet and pressure difference transmitter two is connect with pressure display unit, one end of the source purge gas interface and external air source
The other end of connection, source purge gas interface passes through pipeline one and pipeline tee joint simultaneously, is connected to by pipeline two with pipeline four, institute
Pipeline one is stated equipped with solenoid valve one and timer one, pipeline two is equipped with solenoid valve two and timer two.
3. temperature control heat tracing Pitot tube according to claim 2, which is characterized in that the solenoid valve three and the equal position of timer three
Between the junction and pressure difference transmitter of pipeline one and pipeline three one, the solenoid valve four and timer four are respectively positioned on pipeline two
Between the junction and pressure difference transmitter two of pipeline four.
4. temperature control heat tracing Pitot tube according to claim 1, which is characterized in that the heating film is Kapton PI
Electric radiant Heating Film.
5. temperature control heat tracing Pitot tube according to claim 1, which is characterized in that the insulating layer be silicon rubber, asbestos or
Micarex.
6. temperature control heat tracing Pitot tube according to claim 1, which is characterized in that the thermal insulation layer be glass fibre guard glass fibre cotton,
Polyurethane foam material or rock wool.
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| CN201920075163.4U CN209148055U (en) | 2019-01-17 | 2019-01-17 | A kind of temperature control heat tracing Pitot tube |
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| CN201920075163.4U CN209148055U (en) | 2019-01-17 | 2019-01-17 | A kind of temperature control heat tracing Pitot tube |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109489744A (en) * | 2019-01-17 | 2019-03-19 | 临沂大学 | A kind of temperature control heat tracing Pitot tube |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109489744A (en) * | 2019-01-17 | 2019-03-19 | 临沂大学 | A kind of temperature control heat tracing Pitot tube |
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