CN105842006A - Primary air dust pipe monitoring sampling device and accurate sampling control method for sampling pipe of primary air dust pipe monitoring sampling device - Google Patents

Primary air dust pipe monitoring sampling device and accurate sampling control method for sampling pipe of primary air dust pipe monitoring sampling device Download PDF

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Publication number
CN105842006A
CN105842006A CN201610313046.8A CN201610313046A CN105842006A CN 105842006 A CN105842006 A CN 105842006A CN 201610313046 A CN201610313046 A CN 201610313046A CN 105842006 A CN105842006 A CN 105842006A
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China
Prior art keywords
temperature
probe tube
primary air
pipe
sampling
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Chinese (zh)
Inventor
程时鹤
田冠玉
陈腾飞
周福
方军庭
李冬
李德
郝绍勋
孙超
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China Datang Corp Science and Technology Research Institute Co Ltd East China Branch
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China Datang Corp Science and Technology Research Institute Co Ltd East China Branch
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Priority to CN201610313046.8A priority Critical patent/CN105842006A/en
Publication of CN105842006A publication Critical patent/CN105842006A/en
Pending legal-status Critical Current

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00—Sampling; Preparing specimens for investigation
    • G01N1/02—Devices for withdrawing samples
    • G01N1/10—Devices for withdrawing samples in the liquid or fluent state
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K13/00—Thermometers specially adapted for specific purposes
    • G01K13/12—Thermometers specially adapted for specific purposes combined with sampling devices for measuring temperatures of samples of materials
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00—Sampling; Preparing specimens for investigation
    • G01N1/02—Devices for withdrawing samples
    • G01N1/10—Devices for withdrawing samples in the liquid or fluent state
    • G01N2001/1006—Dispersed solids
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00—Sampling; Preparing specimens for investigation
    • G01N1/02—Devices for withdrawing samples
    • G01N1/10—Devices for withdrawing samples in the liquid or fluent state
    • G01N2001/1031—Sampling from special places
    • G01N2001/105—Sampling from special places from high-pressure reactors or lines

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Sampling And Sample Adjustment (AREA)

Abstract

The invention discloses a primary air dust pipe monitoring sampling device and an accurate sampling control method for a sampling pipe of the primary air dust pipe monitoring sampling device. The sampling pipe is connected with a primary air speed measuring device in a primary air dust pipe through a sampling opening, and a temperature closed-loop control system in the sampling pipe of the primary air speed measuring device is established. A heating wire is laid on the outer side of the sampling pipe, temperature measuring points and a temperature sensor are arranged in the sampling pipe, a temperature signal ti in the sampling pipe is fed back to a controller through a temperature transmitter, a given temperature signal t is preset in the controller, and ti and t are compared; if ti is smaller than t, the controller controls a heating wire heat source switch to be closed, and primary air in the sampling pipe is heated; if ti is larger than t, the controller controls the heating wire heat source switch to be opened, and heating the primary air in the sampling pipe is stopped. The situation that the sampling pipe is blocked by coal dust blocks caused by condensation of vapor in the primary air in the pressure taping process of the dust pipe can be prevented, the accuracy of primary air measuring of a coal combustion boiler is improved, and the primary air dust pipe monitoring sampling device and the accurate sampling control method have important significance for guiding safe and stable running of a heat-engine plant boiler.

Description

Primary air inlet monitoring sampler and the accurate sampling control method of probe tube thereof
Technical field
The invention belongs to coal-burning boiler equipment technical field, relate in particular to boiler-burner and be connected The monitoring sampling equipment of primary air inlet and the control method of accurately sampling.
Background technology
The survival and development of mankind nowadays be unable to do without the energy and make basis, as the basis of national development Industry, the stable and high effective operation of the energy device sustainable development to national economy in energy industry Most important.As the look-ahead industry of national economy, power industry occupies important in energy industry Status.At present in the electric structure of China, thermoelectricity accounts for leading position, the coal of annual exploitation Have 60% for thermal power generation.
Boiler is as one of the three big main frames of coal-burning power plant, and can it direct shadow of stable and high effective operation The safety of Xiang Zhe coal-burning power plant and economy.Primary air inlet is directly and the burner phase of boiler Even, its internal primary wind and powder mixture speed is monitored accurately and real-time and is directly influenced boiler Combustion position, especially with the large-scale coal-fired pot of multilamellar corner direct current injection tangential firing technology Stove, if the primary air velocity of each layer each angle injection differs greatly, skewness can cause burner hearth fire Flame off-centring, flame are adherent, furnace load is uneven, temperature deviation is big, NOx row High-volume increase, produce the problems such as local water-cooling wall overtemperature, coking.Therefore primary air velocity is accurate Monitor most important to the safety and economic operation of boiler.
According to statistics, the commonly used Pitot tube of primary air velocity monitoring device of China's coal unit is former Reason.Therefore, it is primary wind and powder mixture present in the dynamic and static pressure probe tube of monitoring device, And owing to raw coal is dried in coal pulverizer by First air, the moisture major part in raw coal is steamed It is dealt in First air air-flow, causes First air humidity to become big.When primary wind and powder mixture enters temperature After spending relatively low probe tube, the steam in First air is met condensation knot and is caused the coal dust in probe tube Caking blocking probe tube, causes pressure mistake, finally affects accurately measuring and prison of primary air velocity Survey.
Summary of the invention
It is an object of the invention to provide a kind of primary air inlet monitoring sampler and probe tube The accurately control method of sampling, it is possible to make sampling and measuring condition closer to the actual feelings in wind powder pipe Condition, it is achieved accurately measuring and monitoring of primary air velocity, the burning of accurate, real-time monitoring boiler Situation.
It is an object of the invention to be achieved through the following technical solutions:
Primary air inlet monitoring sampler, described sampler includes: take with wind powder pipe tube wall Probe tube, temperature sensor, temperature transmitter and the controller that sample mouth connects, described probe tube Heating wire is laid in outside, arranges temperature point and install described temperature sensor in probe tube, logical Cross described temperature transmitter and temperature signal in probe tube is fed back to described controller, by controller Control the switching electricity of heating wire thermal source circuit；Caliber is set in described probe tube more than probe tube Cavity, described temperature sensor is arranged in cavity.
Further, described probe tube includes dynamic pressure probe tube and static pressure probe tube, described sampling Pipe is connected with wind powder pipe tube wall sample tap by the way of screw socket or welding.
Further, the spacing of described dynamic pressure probe tube and static pressure probe tube is more than or equal to 10cm。
Further, described heating wire is axially wound around setting outside probe tube.
Further, described probe tube is stainless steel tube, stainless steel tube diameter 10mm.
Accurate sampling control method based on primary air inlet monitoring sampler, described sampling fills Put and include: the probe tube being connected with wind powder pipe tube wall sample tap, be axially wound around outside probe tube Having heating wire, arrange temperature sensor in probe tube, a temperature transmitter is by temperature in probe tube Degree signal feeds back to a temperature controller, and temperature controller controls electrothermal wire power's circuit Switching, described method is: by temperature in temperature transmitter acquisition probe tube, by obtain In pipe, temperature compares to fixed temperature with preset at temperature controller, when in pipe, temperature is less than During to fixed temperature, temperature controller is connected electrothermal wire power and is heated probe tube, when temperature in pipe More than during to fixed temperature, temperature controller cuts off electrothermal wire power to be stopped heating probe tube, institute State to preset and to the method for fixed temperature be: the steam partial pressure in air-flow in acquisition primary air inlet, Then First air dew point is determined according to the steam partial pressure in air-flow in the primary air inlet obtained Temperature, will be set greater than to fixed temperature or equal to by First air dew point temperature.
Further, described First air dew point temperature and steam partial pressure are respectively by following relational expression Obtain:
td=f (Pv) (1)；
P v = d o P 0.622 + d o - - - ( 2 ) ;
d o = q c × M a r + q a × d 1 + d q a × 1 1 + d = q c × M a r × ( 1 + d ) + q a × d q a - - - ( 3 ) ;
Wherein:
tdIt is First air dew point temperature, by looking into the P of saturated steam thermobarometervObtain correspondence Dew point temperature；
doIt is that coal pulverizer outlet First air is relative to water capacity；
D is coal pulverizer inlet First air relative to water capacity, local hydrological data obtain；
qcIt is coal pulverizer coal-supplying amount/t/h；
MarBe to the total moisture of coal；
qaIt is coal pulverizer inlet primary air flow/t/h
PvIt is the steam partial pressure in primary air inlet in air-flow,
P is pressure after coal pulverizer.
Further, d takes air maximum water capacity d in the middle of local a yearmax, P takes coal pulverizer Separator pressure Pamx, to fixed temperature t equal to First air dew point temperature td。
Further, described probe tube includes dynamic pressure probe tube and static pressure probe tube, and dynamic pressure samples Pipe is identical to fixed temperature with static pressure probe tube.
Further, described is by controlling terminal input to fixed temperature, when described primary wind and powder In pipe, the steam partial pressure in air-flow is more than when setting threshold value, described will again set to fixed temperature Fixed.
The invention has the beneficial effects as follows:
The present invention, by setting up a primary air speed measuring device probe tube temperature control system, makes Controller receives the feedback temperature in First air wind powder pipe probe tube, with giving that controller is preset Fixed temperature compares, when feedback temperature less than to fixed temperature time, to probe tube outside heating wire Heat, when feedback temperature is higher than during to fixed temperature, and controller controls heating wire cut-off, stops Only heating.In so can making probe tube, First air temperature remains at more than its dew point temperature, Successfully prevent because steam coagulation causes coal dust caking to cause sampling pipe plug in First air Plug, improve one dant combusting boiler primary air velocity measure accuracy, high efficient and reliable, simple and easy to do, To instructing, power plant boiler safe and stable operation is significant.
Below in conjunction with the accompanying drawings and the present invention is described in further detail by detailed description of the invention.
Accompanying drawing explanation
Fig. 1 is present configuration principle schematic.
Reference: 1. dynamic pressure probe tube；2. static pressure probe tube；3. heating wire；4. temperature transmitter； 5. thermal source switch；6. controller；7. primary air speed measuring device；8. temperature sensor；9. cavity.
Detailed description of the invention
Embodiment 1
Primary air inlet monitoring sampler, described sampler includes: take with wind powder pipe tube wall Probe tube, temperature sensor, temperature transmitter and the controller that sample mouth connects, described probe tube Heating wire is laid in outside, arranges temperature point and install described temperature sensor in probe tube, logical Cross described temperature transmitter and temperature signal in probe tube is fed back to described controller, by controller Control the switching electricity of heating wire thermal source circuit；Caliber is set in described probe tube more than probe tube Cavity, described temperature sensor is arranged in cavity.Described probe tube includes dynamic pressure probe tube With static pressure probe tube, described probe tube samples with wind powder pipe tube wall by the way of screw socket or welding Mouth connects.
Embodiment 2
The present embodiment is the improvement carried out on the basis of embodiment 1, with enforcement in the present embodiment The part that example 1 is identical, refer to the content disclosed in embodiment 1 and understands, embodiment 1 Disclosure should also be as the content as the present embodiment, is not repeated description herein.
As it is shown in figure 1, primary air inlet monitoring sampler in the present embodiment, including: with wind (sample tap connects one for the static pressure probe tube 1 of tube cell tube wall sample tap connection and dynamic pressure probe tube 2 Primary air speed measuring device 7 in secondary point of tube cell), temperature sensor 8, temperature transmitter 4 and Controller 6, the most axially lays heating wire outside described dynamic pressure probe tube 2 and static pressure probe tube 1 3；It is respectively provided with the most independent temperature sensor in dynamic pressure probe tube 2 and static pressure probe tube 1 8, and by the temperature pick-up 4 of each connection, respective temperature signal is fed back to respectively respectively Described controller 6, described controller 6 is by two independent thermal source switch 5 (air switches) Control the switching electricity of the heating wire thermal source circuit of dynamic pressure probe tube 2 and static pressure probe tube 1 respectively.
The spacing of dynamic pressure probe tube 2 and static pressure probe tube 1 is 10cm.Dynamic pressure probe tube 2 Be respectively provided with caliber in static pressure probe tube 1 more than the circular cavity 9 of probe tube, set in cavity 9 Put temperature point mounting temperature sensor 8, to prevent the installation of temperature point from blocking probe tube. Dynamic pressure probe tube 2 and static pressure probe tube 1 are stainless steel tube, diameter 10mm, beneficially heat conduction.
In the present embodiment:
The heating wire of dynamic and static pressure probe tube is respectively connected to 220V alternating current power supply, opens with air Close control heating wire switching electricity, with PLC control two air switches Guan Bi and Disconnect；The circular cavity that welding one caliber is bigger in the middle of probe tube, welding temperature in cavity Measuring point；Reload temperature sensor in temperature point, and by temperature transmitter by temperature signal Feed back to controller；Given controller one temperature signal t The temperature sensor precision of temperature point < 0.2 DEG C.Probe tube end band female thread nut, pad Structure, probe tube is threaded connection with sample tap.
Embodiment 3
The accurate sampling control method of primary air inlet probe tube, described probe tube by sample tap with Primary air speed measuring device in described primary air inlet connects, as it is shown in figure 1, set up one Cryocooler Temperature Closed Loop Control System in primary air speed measuring device probe tube, lays electric heating outside probe tube Silk, is arranged temperature point mounting temperature sensor, will be taken by temperature transmitter in probe tube Temperature signal t in sample pipeiFeeding back to controller, given temperature signal t preset by controller, compares tiAnd t；If ti＜ t, controller controls heating wire thermal source switch Guan Bi, to First air in probe tube Heat；If ti＞ t, controller controls heating wire thermal source and switches off, stops probe tube Interior First air heats.
The acquisition methods of described given temperature signal t comprises the following steps:
1) assume that the full water in given coal is all evaporated in First air；Measure or consult relevant ginseng Number, and bring the middle coal pulverizer outlet First air that obtains of formula (1) into relative to water capacity do,
d o = q c &times; M a r + q a &times; d 1 + d q a &times; 1 1 + d = q c &times; M a r &times; ( 1 + d ) + q a &times; d q a - - - ( 1 )
In formula: doCoal pulverizer outlet First air is relative to water capacity；qcCoal pulverizer coal-supplying amount/t/h； MarThe total moisture of given coal；qaCoal pulverizer inlet primary air flow/t/h；D coal pulverizer Entrance First air is relative to water capacity；
2) coal pulverizer is exported First air relative to water capacity doSubstitute in formula (2) and obtain once Steam partial pressure P in air-flow in wind powder pipev,
P v = d o P 0.622 + d o - - - ( 2 )
In formula: P is pressure after coal pulverizer；
3) P is obtained by looking into saturated steam thermobarometervCorresponding dew point temperature td, td=f (Pv)。
In order in making probe tube, steam is non-condensing, then give controller temperature t and should be greater than coal-grinding First air dew point temperature t after machined, t under therefore t takes maximum conditionsdMaximum.Work as mill Coal machine First air entrance takes maximum d relative to water capacity dmax, coal pulverizer outlet pressure P takes maximum Value PmaxTime, tdMaximum.dmaxAnd PmaxLook into local hydrological data and coal pulverizer device parameter obtains ?；
In the present embodiment, the acquisition of each parameter is as follows:
D coal pulverizer inlet First air is relative to water capacity；(by Anhui can as a example by Hefei Power Plant be, Consult locality, Hefei City water temperature data, dmax=100%, air maximum water capacity in the middle of a year, The inquiry of local weather bureau；Can also be obtained by measurement)
qcCoal pulverizer coal-supplying amount/t/h；(pulverizer capacity, by Anhui can as a example by Hefei Power Plant be, Consulting " coal pulverizer operation operation instructions " 17-72t/h, power plant provides)
MarThe total moisture of given coal；(coal total moisture checked by coal pulverizer, can send out in Hefei with Anhui Being to consult " coal pulverizer operation operation instructions ", 7.96% as a example by power plant, power plant provides)
qaCoal pulverizer inlet primary air flow/t/h；(coal pulverizer inlet primary air flow, can Hefei with Anhui Being to consult " coal pulverizer operation operation instructions " as a example by power plant, 70-120t/h, power plant carries For)
doCoal pulverizer outlet First air is relative to water capacity；(substituting into above parameter, calculate)
Pressure after P coal pulverizer；(pressure after coal pulverizer can be to look into as a example by Hefei Power Plant by Anhui Read " coal pulverizer operation operation instructions ", Pmax=3000Pa, i.e. separator for coal mill pressure, Power plant provides)
Probe tube includes that dynamic pressure probe tube and static pressure probe tube, described dynamic pressure probe tube and static pressure take The most independent temperature sensor it is respectively provided with and respectively by the temperature each connected in sample pipe Respective temperature signal is fed back to described controller by transmitter respectively, and described controller passes through two Individual independent air switch controls the heating wire thermal source of dynamic pressure probe tube and static pressure probe tube respectively The switching electricity of circuit, in order to eliminate the pressure in the heated rear dynamic and static probe tube of probe tube Difference is affected, and the most dynamic and static probe tube arranges same controller and gives temperature signal t.

Claims (10)

1. primary air inlet monitoring sampler, it is characterised in that: described sampler includes: with Probe tube, temperature sensor, temperature transmitter and the controller that wind powder pipe tube wall sample tap connects, Lay heating wire outside described probe tube, temperature point is set in probe tube and described temperature is installed Sensor, feeds back to described control by described temperature transmitter by temperature signal in probe tube Device, is controlled the switching electricity of heating wire thermal source circuit by controller；In described probe tube, pipe is set Footpath is more than the cavity of probe tube, and described temperature sensor is arranged in cavity.
Primary air inlet monitoring sampler the most according to claim 1, it is characterised in that: described Probe tube includes dynamic pressure probe tube and static pressure probe tube, and described probe tube is by screw socket or welding Mode is connected with wind powder pipe tube wall sample tap.
Primary air inlet the most according to claim 1 or claim 2 monitoring sampler, it is characterised in that: The spacing of described dynamic pressure probe tube and static pressure probe tube is more than or equal to 10cm.
Primary air inlet the most according to claim 1 or claim 2 monitoring sampler, it is characterised in that: Described heating wire is axially wound around setting outside probe tube.
Primary air inlet the most according to claim 1 or claim 2 monitoring sampler, it is characterised in that: Described probe tube is stainless steel tube, stainless steel tube diameter 10mm.
6. accurate sampling control method based on primary air inlet monitoring sampler, described sampling fills Put and include: the probe tube being connected with wind powder pipe tube wall sample tap, be axially wound around outside probe tube Having heating wire, arrange temperature sensor in probe tube, a temperature transmitter is by temperature in probe tube Degree signal feeds back to a temperature controller, and temperature controller controls electrothermal wire power's circuit Switching, described method is: by temperature in temperature transmitter acquisition probe tube, by obtain In pipe, temperature compares to fixed temperature with preset at temperature controller, when in pipe, temperature is less than During to fixed temperature, temperature controller is connected electrothermal wire power and is heated probe tube, when temperature in pipe More than during to fixed temperature, temperature controller cuts off electrothermal wire power to be stopped heating probe tube, its Being characterised by, described presetting to the method for fixed temperature is: in acquisition primary air inlet in air-flow Steam partial pressure, then determines according to the steam partial pressure in air-flow in the primary air inlet obtained First air dew point temperature, will be set greater than to fixed temperature or equal to by First air dew point temperature.
Control method the most according to claim 6, it is characterised in that: described First air dew point temperature Obtained by following relational expression respectively with steam partial pressure:
td=f (Pv) (1)；
P v = d o P 0.622 + d o - - - ( 2 ) ;
d o = q c &times; M a r + q a &times; d 1 + d q a &times; 1 1 + d = q c &times; M a r &times; ( 1 + d ) + q a &times; d q a - - - ( 3 ) ;
Wherein:
tdIt is First air dew point temperature, by looking into the P of saturated steam thermobarometervObtain correspondence Dew point temperature；
doIt is that coal pulverizer outlet First air is relative to water capacity；
D is that coal pulverizer inlet First air is relative to water capacity；
qcIt is coal pulverizer coal-supplying amount/t/h；
MarBe to the total moisture of coal；
qaIt is coal pulverizer inlet primary air flow/t/h
PvIt is the steam partial pressure in primary air inlet in air-flow,
P is pressure after coal pulverizer.
Control method the most according to claim 7, it is characterised in that: d takes locality and works as a hollow in Gas maximum water capacity dmax, P takes separator for coal mill pressure Pamx, to fixed temperature t equal to dew Point temperature td。
Control method the most according to claim 6, it is characterised in that: described probe tube includes moving Pressure probe tube and static pressure probe tube, dynamic pressure probe tube and static pressure probe tube identical to fixed temperature.
Control method the most according to claim 6, it is characterised in that: described is logical to fixed temperature Cross the input of control terminal, when the steam partial pressure in air-flow in described primary air inlet is more than setting During threshold value, described will reset to fixed temperature.
CN201610313046.8A 2016-05-11 2016-05-11 Primary air dust pipe monitoring sampling device and accurate sampling control method for sampling pipe of primary air dust pipe monitoring sampling device Pending CN105842006A (en)

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