CN105865542A - Integrated measuring device and method for smoke flow and pollutants - Google Patents
Integrated measuring device and method for smoke flow and pollutants Download PDFInfo
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- CN105865542A CN105865542A CN201610207402.8A CN201610207402A CN105865542A CN 105865542 A CN105865542 A CN 105865542A CN 201610207402 A CN201610207402 A CN 201610207402A CN 105865542 A CN105865542 A CN 105865542A
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- 239000003344 environmental pollutant Substances 0.000 title claims abstract description 48
- 231100000719 pollutant Toxicity 0.000 title claims abstract description 48
- 238000000034 method Methods 0.000 title abstract description 10
- 239000000779 smoke Substances 0.000 title abstract description 6
- 238000005259 measurement Methods 0.000 claims abstract description 33
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 132
- 239000003546 flue gas Substances 0.000 claims description 132
- 230000003068 static effect Effects 0.000 claims description 12
- 239000007789 gas Substances 0.000 claims description 10
- 230000009467 reduction Effects 0.000 claims description 5
- 230000008859 change Effects 0.000 claims description 3
- 230000008676 import Effects 0.000 claims description 3
- 238000000691 measurement method Methods 0.000 claims description 2
- 230000001737 promoting effect Effects 0.000 claims description 2
- 239000011159 matrix material Substances 0.000 description 8
- 239000000428 dust Substances 0.000 description 6
- 239000012535 impurity Substances 0.000 description 5
- 238000005070 sampling Methods 0.000 description 5
- 238000001514 detection method Methods 0.000 description 4
- 208000028659 discharge Diseases 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000012544 monitoring process Methods 0.000 description 4
- 235000019504 cigarettes Nutrition 0.000 description 3
- 238000011109 contamination Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 239000000523 sample Substances 0.000 description 3
- 238000005406 washing Methods 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 2
- 239000003082 abrasive agent Substances 0.000 description 2
- 238000000738 capillary electrophoresis-mass spectrometry Methods 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 239000003500 flue dust Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 229910052815 sulfur oxide Inorganic materials 0.000 description 2
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/05—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects
- G01F1/34—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/06—Investigating concentration of particle suspensions
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
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- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Medicinal Chemistry (AREA)
- Food Science & Technology (AREA)
- Combustion & Propulsion (AREA)
- Dispersion Chemistry (AREA)
- Fluid Mechanics (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention discloses an integrated measuring device and method for smoke flow and pollutants. The measuring device comprises a collecting unit, a smoke flow measuring unit and a smoke pollutant measuring unit. The collecting unit comprises a plurality of collecting pipes, a positive differential pressure communicating pipe and a negative differential pressure communicating pipe. Each collecting pipe comprises a positive pressure measuring pipe and a negative pressure measuring pipe. A plurality of positive pressure measuring holes are formed in the positive pressure measuring pipes in the length direction, and a plurality of negative pressure measuring holes are formed in the negative pressure measuring pipes in the length direction. The positive pressure measuring pipes of the collecting pipes are connected through the positive differential pressure communicating pipe, and the negative pressure measuring pipes of the collecting pipes are connected through the negative differential pressure communicating pipe. An outlet of the positive differential pressure communicating pipe and an outlet of the negative differential pressure communicating pipe are connected with the smoke flow measuring unit. The point flow speed is converted into the line flow speed and the face flow speed, the problem that a short flue flow speed field is uneven in distribution is solved, and the measurement influence caused by the large pipeline diameter of a flue needing to be measured and uneven distribution of a flow field on the cross section is effectively reduced, so that measurement is more accurate.
Description
Technical field
The present invention relates to pollutant levels integrated measuring field in flue gas flow and flue gas, being specifically related to many dot matrix types flue gas flow and pollutant integral measurement method and device thereof, this method and device thereof are applied in the real time on-line monitoring system of large-scale flue gas in flue.
Background technology
Coal-burning power plant is the primary discharge source of sulfur dioxide, nitrogen oxides, flue dust and GHG carbon dioxide etc.; constantly pay attention to now with Environmental protection; pollutant standard in the flue gas of coal-burning power plant's discharge also improves constantly; in order to ensure that the major polluting sources fume emission industry of China develops towards greenization, free of contamination direction; coal-burning power plant is mounted smoke on-line monitoring system (CEMS); and by this system to needing the flue gas of discharge in air carry out real-time sampling and detect, it is to avoid flue gas is to environment.
It is that therefore the accuracy of flow-speed measurement is directly connected to gross contamination emission, concentration calculates and the assessment of flue gas purification system efficiency, determines that the important parameter of gross contamination emission with the average flue gas flow rate of monitoring section as foundation that the discharge capacity of flue gas measures.The CEMS of current domestic coal-burning power plant uses the sample mode of single-point mostly, i.e. uses the mode of the sampling choosing a measuring point to carry out flue gas sampling to by the flue gas of flue in flue.Yet with limited by the field, the flue of most domestic power plant is laid all can not meet detection requirement, and the Flow Field Distribution of flue is complicated, flow field is in the change in moment, the concentration of polluter changes and time changing also with flow field, even if at same monitoring section, the Flow Field Distribution of difference position all differs the most in the same time, therefore the sample mode of single-point is difficult to ensure that the flow value of measurement represents cross section real traffic, it is also difficult to the accurately concentration of the pollutant in measurement flue gas.
The measuring instruments being presently used for flue gas flow is pitot tube mostly, and its operation principle is to measure according to differential pressure principle, and according to Bernoulli equation, the differential pressure signal that pitot tube produces is converted into flow output signal through instrument.Existing Pitot tube arrangement, pitot tube length up to 2m, application for Large-scale machine set is the strongest, the position near internal face, the flue cross section cannot be monitored, if but pitot tube is lengthened, due to flue vibration, the reason such as wind speed is bigger, pitot tube can be made shake in flue and make the gaging hole cannot be vertical with flue gas flow direction holding, and easily make pitot tube fracture.Same, as the measuring instrument of concentration of flue gas pollutants encounters with pitot tube problem, and the measurement of flue gas flow and concentration of flue gas pollutants can not synchronize carry out, and has a great impact the degree of accuracy of measurement.
And due to when coal-fired boiler in thermal power plant runs, the substantial amounts of impurity that can attach in flue gas, when measuring, the pressure tappings of pitot tube or even pressure pipe meeting Severe blockage, cause pitot tube to measure misalignment maybe cannot work, if supporting special blow device, the operating cost of height measuring system will necessarily be put forward, reduce the economy of system.Therefore, under actual condition, coal-burning power plant's flue gas in flue flow and concentration of flue gas pollutants are carried out on-line measurement and needs to solve following problem: the 1. situation in measured parameter value required objective ground reflection flue, certainty of measurement wants height；2. the anti-blocking performance of measurement apparatus is good；3. good economy performance, convenient for installation and maintenance.
Summary of the invention
The technical problem to be solved is for above-mentioned the deficiencies in the prior art, it is provided that a kind of can truly reflect flue gas flow and the measurement apparatus of pollutant levels and measuring method in flue.
For solving above-mentioned technical problem, the present invention adopts the following technical scheme that realization:
nullA kind of flue gas flow and pollutant integrated measurer，Including collecting unit、Flue gas flow measuring unit and flue gas pollutant measuring unit，Described collecting unit includes malleation outfan and negative pressure outfan，Described flue gas flow measuring unit is connected with described malleation outfan and negative pressure outfan，It is characterized in that，Described collecting unit includes multiple collection tube、Positive differential pressure communicating pipe and negative differential pressure could communicating pipe，The plurality of collection tube is positioned on the same plane vertical with flue gas flow direction direction，Described collection tube includes positive pressure pipe and negative pressure pipe，Described positive pressure pipe is provided with multiple positive pressure port along its length，The opening direction of this positive pressure port is just to described flue gas flow direction，Described negative pressure pipe is provided with multiple negative pressure port along its length，On described negative pressure pipe, the negative pressure port on same position is two along its length，The opening direction of this negative pressure port is vertical with described flue gas flow direction，It is connected by described positive differential pressure communicating pipe between the positive pressure pipe of the plurality of collection tube，It is connected by described negative differential pressure could communicating pipe between the negative pressure pipe of the plurality of collection tube，The outlet of described positive differential pressure communicating pipe and negative differential pressure could communicating pipe is connected with described flue gas flow measuring unit，The outlet of described negative differential pressure could communicating pipe is connected with described flue gas pollutant measuring unit by a three-way magnetic valve.The present invention bears negative pressure port on pressure pipe and does not use and be arranged on bottom (back side), it is to avoid because flue gas streams generation eddy current, cause crushing.Using opposition form to be arranged on both sides, local cigarette can be overcome to press unequal phenomenon, the flue gas pressures making measurement is more accurate.
Described collection tube also includes the described positive pressure pipe of connection and a sleeve for negative pressure pipe, is provided with heat tracing pipe and temperature tube, is provided with temperature sensor in described temperature tube, arrange by heater element in described heat tracing pipe in described sleeve.
Described positive pressure pipe is tangent with the axially in parallel of negative pressure pipe and the external diameter of the two, and described heat tracing pipe and temperature tube are the most tangent with the external diameter of positive pressure pipe, negative pressure pipe.By connected mode tangent to each other, it is not only convenient for mutual fixing, decreases the volume of sleeve pipe, reduce the impact of flue gas flow field in flue inner sleeve, thus improve the precision of measurement.Meanwhile, bush material cost is also reduced.
Described positive differential pressure communicating pipe and be the tee T comprising a dirt ash room negative differential pressure could communicating pipe.
The plurality of collection tube is arranged in parallel, described positive pressure port equidistant placement, described negative pressure port equidistant placement, and described positive pressure port and negative pressure port are positioned at the same position of collection tube length direction.By offering positive pressure port and negative pressure port at same position, the flow process of the flue gas made is consistent, has friction loss, can react the pressure reduction of flue gas more accurately.
It is provided with preventing clogging up device in described negative pressure pipe；Described preventing clogging up device includes the rotary shaft being arranged in described negative pressure pipe, and be connected with described rotary shaft in being arranged on described negative pressure pipe carries out promoting the blockage resisting blade rotated by the flue gas entered from described negative pressure port.
Described flue gas flow measuring unit is made up of differential pressure pick-up, static pressure transducer and data acquisition circuit, and two pressure acquisition pipes of described differential pressure pick-up are respectively communicated with described positive differential pressure communicating pipe and negative differential pressure could communicating pipe for measuring pressure reduction；Static pressure transducer collection tube was connected for measuring static pressure with negative differential pressure could communicating pipe；Data acquisition circuit gathers static pressure transducer, differential pressure pick-up and the signal of temperature sensor, changes into the flow of flue gas.
Described flue gas pollutant measuring unit includes a three-way magnetic valve, one flue gas premixed device, a flue gas analyzer and data acquisition circuit, the outlet of negative differential pressure could communicating pipe is connected with three-way magnetic valve air inlet, one end, gas outlet of three-way magnetic valve is connected with flue gas premixed device import, the three-way magnetic valve gas outlet other end is connected with the negative pressure inlet mouth of flue gas flow measuring unit, the outlet of flue gas premixed device is connected with flue gas analyzer, data acquisition circuit gathers the signal of telecommunication of flue gas analyzer, changes into the concentration of pollutant in flue gas.
A kind of flue gas flow and the measuring method of pollutant, use any of the above-described flue gas flow to measure with contaminant measurement device.
The present invention uses following operation principle to realize:
The present invention measures at same flue and uses multiple collection tube and multiple positive pressure port and the multiple negative pressure port being arranged on collection tube to form many dot matrix types metering system on cross section, practical situation according to cross section to be measured arranges measuring point number, then each measuring point was connected by differential pressure communicating pipe, malleation is connected with malleation, negative pressure is connected with negative pressure, positive and negative pressure side is respectively drawn and is connected with flue gas flow measuring unit a differential pressure communicating pipe, records the flow in flue cross section.Its principle is: according to Bernoulli equation principle, the fluid differential pressure signal being installed throttling element output in the duct by measurement reflects flow.Same, the present invention measures at same flue and uses many dot matrix types metering system to measure the concentration of pollutant in flue gas on cross section, its principle is: utilizes the switching of three-way magnetic valve to be connected with flue gas analyzer negative differential pressure could communicating pipe, thus measures the concentration of pollutant in flue gas.
Compared with prior art, the invention has the beneficial effects as follows:
1. the present invention uses many dot matrix types metering system in same flue cross section, and the differential pressure size obtained with malleation and the negative pressure of each measuring point calculates the flue gas flow in whole flue cross section.Realize some flow velocity to line flow velocity and the transformation of surface current speed, overcome short flue flow velocity field distribution problem of non-uniform, effectively reduce that the required pipe diameter measuring flue is big, the uneven measurement impact brought in flow field on cross section so that it is more accurate to measure.
2. the present invention can synchronously complete the measurement of pollutant levels in the flue gas of same flue cross section, therefore the operation of the removal device of pollutant in flue can be controlled more accurately, such as in the SCR system control of ammonia spraying amount, save operating cost, and measuring technology compared to existing pollutant levels, the present invention also has certain economy and has higher degree of accuracy.The present invention measures technology compared to flue direct sampling method concentration of flue gas pollutants can save the cost of probe tube, and utilize many dot matrix types metering system can accurately reflect the pollutant levels in whole flue cross section, secondly technology is measured compared to optical method concentration of flue gas pollutants, the present invention has higher accuracy, and do not affected by measuring environment, cost is the most less expensive.
3. present invention can apply to flow and the pollutant measurement of all kinds, the especially flue gas of heavy in section flue, can arbitrarily increase and decrease measure dot number according to the practical situation in cross section, easy for installation flexibly.
4. positive pressure pipe uses concave structure design, it is possible to overcome air-flow non-uniform phenomenon；Utilizing air-flow self-balancing principle, it is achieved that multipoint pressure equalization, negative pressure pipe uses opposition form simultaneously, overcomes local cigarette and presses unequal phenomenon, and the flue gas pressures making measurement is more accurate.Arranging heat tracing pipe, can prevent flue-gas temperature from reducing, the measurement making pollutant levels is more accurate.Temperature sensor built-in pipe is set, it is possible to the temperature in detection flue simultaneously.
5. reached to prevent the purpose of flue dust blocking gas circuit by the setting of preventing clogging up device and heavy ash room, without using blowback source of the gas, preferably resolve the normal work under the operating mode that dust impurities is dense in flue gas flow is measured with pollutant levels, effectively avoid pitot tube to be blocked by dust impurities, remain the unobstructed of pitot tube, it is achieved that choke preventing function.
6. pitot tube is placed in bullet type sleeve by the present invention, and when making flue gas flow through measuring point, flowing is more uniform, is effectively improved the output pressure reduction of pitot tube, increases range ratio, reduces crushing and effectively prevents from washing away pitot tube at flue gas and corroding.
7. bullet type sleeve selects high-abrasive material and Anticorrosion measure, effectively prevents from washing away bullet jacket cylinder and the corrosive gas corrosion to bullet jacket cylinder such as SOx, NOx in flue gas at flue gas.
Accompanying drawing explanation
In order to be illustrated more clearly that present disclosure, the accompanying drawing used required in embodiment will be briefly described, wherein below:
Fig. 1 is the structural representation installing 4 collection tubes in same flue detection sectional plane；
Fig. 2 is pressure port and collection tube structural representation；
Fig. 3 is the structural representation of dust collecting installation；
Fig. 4 is flue gas flow measuring unit and flue gas pollutant measuring unit structural representation.
Description of reference numerals:
1, collecting unit；2, collection tube；3, calculation matrix；4, positive pressure port；5, negative pressure port；6, positive pressure pipe；7, negative pressure pipe；8, positive differential pressure communicating pipe；9, negative differential pressure could communicating pipe；10, heavy ash room；11, heat tracing pipe；12, temperature tube；13, sleeve；14, mounting flange；15, fixture；16, rotary shaft；17, blade；18, plugging device；19, flue gas flow measuring unit；20, three-way magnetic valve；21, flue gas pollutant measuring unit；22, flue gas premixed device；23, flue gas analyzer.
Detailed description of the invention:
By combining accompanying drawings below and embodiment, the present invention is further elaborated.
As shown in Fig. 1, one flue gas flow of the present invention and pollutant integrated measurer, including collecting unit 1, flue gas flow measuring unit 19 and flue gas pollutant measuring unit 21.nullWherein，Collecting unit 1 includes multiple collection tube 2、Positive differential pressure communicating pipe 8 and negative differential pressure could communicating pipe 9，Multiple collection tubes 2 are positioned on the same plane vertical with flue gas flow direction direction，Collection tube 2 includes positive pressure pipe 6 and negative pressure pipe 7，Positive pressure pipe 6 is provided with multiple positive pressure port 4 along its length，The opening direction of this positive pressure port 4 is just to flue gas flow direction，Negative pressure pipe 7 is provided with multiple negative pressure port 5 along its length，On negative pressure pipe 7, the negative pressure port 5 on same position is two along its length，The opening direction of this negative pressure port 5 is vertical with flue gas flow direction，It is connected by positive differential pressure communicating pipe 8 between the positive pressure pipe 6 of multiple collection tubes 2，It is connected by described negative differential pressure could communicating pipe 9 between the negative pressure pipe 7 of multiple collection tubes 2，The outlet of positive differential pressure communicating pipe 8 and negative differential pressure could communicating pipe 9 is connected with flue gas flow measuring unit 19，For measuring the flow of flue gas.The outlet of negative differential pressure could communicating pipe 9 is connected with flue gas pollutant measuring unit 21 by three-way magnetic valve 20, for measuring the concentration of flue gas pollutant.
Measurement apparatus of the present invention is installed on walling of flue, and collection tube is positioned at flue and is perpendicular to walling of flue.As a example by flue cross section shown in Fig. 1, a total of 4 collection tubes of calculation matrix measured on cross section of same flue, the thief hole of 4 positive/negative-pressures is offered on each collection tube, thus a total of 16 sampling and measuring points, size according to flue cross section, can arbitrarily add and subtract the quantity of measuring point, therefore measurement result can react flue gas flow and the concentration of flue gas pollutants in this measurement cross section well.
As shown in Fig. 2 a, positive pressure port 4 is by several concave holes equidistantly left on positive pressure pipe 6, hole is oriented parallel to flow of flue gas direction, the dynamic pressure of difference position can be detected simultaneously, utilizing air-flow self-balancing principle, it is achieved that multipoint pressure equalization, perforate simultaneously is concave hole simultaneously, the direction just flow through flue gas, can get rid of airflow direction non-uniform phenomenon.Negative pressure port 5 is positioned on negative pressure pipe 7 by the some groups of negative pressure opposition holes equidistantly left, negative pressure opposition hole two concave hole becomes 90 degree of angles respectively with flow of flue gas direction, negative pressure port 5 uses opposition form, local cigarette can be overcome to press unequal phenomenon, and the flue gas pressures making measurement is more accurate.Collection tube 2 includes positive pressure pipe 6, negative pressure pipe 7, heat tracing pipe 11, temperature tube 12 and sleeve 13, and its middle sleeve 13 can be bullet type or other shapes, and temperature tube 12 is temperature sensor built-in pipe.Positive pressure pipe 6 is tangent with the axially in parallel of negative pressure pipe 7 and the external diameter of the two, heat tracing pipe 11 and temperature tube 12 are the most tangent with the external diameter of positive pressure pipe 6, negative pressure pipe 7, and positive pressure pipe 6, negative pressure pipe 7, heat tracing pipe 11, temperature tube 12 are through in sleeve 13.The top of sleeve 13 is provided with sealing member and fixture 15, and positive pressure pipe 6, negative a length of 4.2 m of pressure pipe 7, external diameter is 12 mm, a length of 4.2 m of heat tracing pipe 11, temperature tube 12, and external diameter is 5 mm.A length of 4.5 m of bullet type sleeve 13.Positive pressure pipe 6, negative pressure pipe 7, heat tracing pipe 11, the connected mode of temperature tube 12 are fixing connections, such as: welding, cementing etc..
Arranging heat tracing pipe 11, can prevent flue-gas temperature from reducing, the measurement making pollutant levels is more accurate.Temperature tube 12 is set, it is possible to the temperature in detection flue simultaneously.Sleeve 13 and mounting flange 14 and fixture 15 use high-abrasive material and Anticorrosion measure, can effectively prevent flue gas to bullet jacket cylinder 13 and mounting flange 14 and fixture 15 wash away and in flue gas the corrosive gas such as SOx, NOx to bullet jacket cylinder 13 and mounting flange 14 and the corrosion of fixture 15.Positive pressure pipe 6, negative pressure pipe 7 are positioned in sleeve, and when making flue gas flow through measuring point, flowing is more uniform, is effectively improved the output pressure reduction of pitot tube, increases range ratio, reduce crushing and effectively prevent from washing away pressure pipe at flue gas and corroding.Obviously the shape of sleeve 13 can also be other shapes, such as: the cylinder etc. of hollow, the shape of sleeve 13 can be adjusted flexibly in practice as required.
As shown in Fig. 2 b, being provided with preventing clogging up device in negative pressure pipe 7, preventing clogging up device includes the rotary shaft 16 being arranged in negative pressure pipe 7, the blade 17 being connected with described rotary shaft 16 in being arranged on described negative pressure pipe 7.Blade 17 uses stainless steel material to make, and blade 17 is positioned at the center of negative pressure pipe 7.When many dot matrix types flue gas flow, pollutant integrated measurer operationally, pollutant levels in flue gas are still measured by the flow whether surveying flue gas, active force and the vibrations of pipeline due to air-flow, the swing of blade 17 can be caused, the impurity depended in negative pressure pipe 7 can be scraped or shakes off while swinging, and then blown away by air-flow, realize the automatic dredging to negative pressure pipe 7, effectively avoid negative pressure pipe 7 to be blocked by dust impurities, the unobstructed of negative pressure pipe 7 can be remained, it is achieved that choke preventing function.
As shown in Fig. 3, positive differential pressure communicating pipe 8 after parallel connection and be placed in the top of heavy ash room 10 negative differential pressure could communicating pipe 9, i.e. positive differential pressure communicating pipe 8 after parallel connection and negative differential pressure could communicating pipe 9 all with heavy 10 groups, room of ash l-shaped shape, the heavy ash room 10 set up on positive differential pressure communicating pipe 8 and negative differential pressure could communicating pipe 9 can effectively be collected in pressure obtaning device gatherer process and be entered its internal dust, prevents a small amount of dust granule from entering flue gas flow measuring unit 19 and flue gas pollutant measuring unit 21 in Brownian movement mode.The end of heavy ash room 10 is additionally provided with on dismountable plugging device 18, differential pressure communicating pipe and heavy ash room and is mounted on the flange for fixation measuring group position.The combination of the L type shape being made up of positive differential pressure communicating pipe 8 and negative differential pressure could communicating pipe 9 and heavy ash room 10, can increase structural stability, prevent structure surge.
As shown in Fig. 4, flue gas flow measuring unit 19 is made up of differential pressure pick-up, static pressure transducer, data acquisition circuit, temperature sensor.Two pressure acquisition pipes of differential pressure pick-up are respectively communicated with positive differential pressure communicating pipe 8 and negative differential pressure could communicating pipe 9, for measuring the pressure differential of malleation and negative pressure, and convert it into the signal of telecommunication, static pressure transducer collection tube is only connected with negative differential pressure could communicating pipe 9, for measuring static pressure, and convert it into the signal of telecommunication, temperature sensor collection tube is only connected with temperature tube 12, for measuring measuring point temperature, and convert it into the signal of telecommunication, data acquisition circuit gathers static pressure transducer, differential pressure pick-up and the signal of telecommunication of temperature sensor, changes into the flow of flue gas.
Flue gas pollutant measuring unit 21 includes a three-way magnetic valve 20, one flue gas premixed device 22, one flue gas analyzer 23 and data acquisition circuit, the outlet of negative differential pressure could communicating pipe 9 is connected with three-way magnetic valve 20 air inlet, one end, gas outlet of three-way magnetic valve 20 is connected with flue gas premixed device 22 import, the three-way magnetic valve 20 gas outlet other end is connected with the negative pressure inlet mouth of flue gas flow measuring unit 19, flue gas premixed device 22 outlet is connected with flue gas analyzer 23, data acquisition circuit gathers the signal of telecommunication of flue gas analyzer, change into the concentration of pollutant in flue gas.
Claims (9)
- null1. flue gas flow and pollutant integrated measurer，Including collecting unit、Flue gas flow measuring unit and flue gas pollutant measuring unit，Described collecting unit includes malleation outfan and negative pressure outfan，Described flue gas flow measuring unit is connected with described malleation outfan and negative pressure outfan，It is characterized in that，Described collecting unit includes multiple collection tube、Positive differential pressure communicating pipe and negative differential pressure could communicating pipe，The plurality of collection tube is positioned on the same plane vertical with flue gas flow direction direction，Described collection tube includes positive pressure pipe and negative pressure pipe，Described positive pressure pipe is provided with multiple positive pressure port along its length，The opening direction of this positive pressure port is just to described flue gas flow direction，Described negative pressure pipe is provided with multiple negative pressure port along its length，On described negative pressure pipe, the negative pressure port on same position is two along its length，The opening direction of this negative pressure port is vertical with described flue gas flow direction，It is connected by described positive differential pressure communicating pipe between the positive pressure pipe of the plurality of collection tube，It is connected by described negative differential pressure could communicating pipe between the negative pressure pipe of the plurality of collection tube，The outlet of described positive differential pressure communicating pipe and negative differential pressure could communicating pipe is connected with described flue gas flow measuring unit，The outlet of described negative differential pressure could communicating pipe is connected with described flue gas pollutant measuring unit by a three-way magnetic valve.
- Measurement apparatus the most according to claim 1, it is characterized in that: described collection tube also includes the described positive pressure pipe of connection and a sleeve for negative pressure pipe, heat tracing pipe and temperature tube it is provided with in described sleeve, in described temperature tube, it is provided with temperature sensor, arranges by heater element in described heat tracing pipe.
- 3. the measurement apparatus as described in claim 2, it is characterised in that: described positive pressure pipe is tangent with the axially in parallel of negative pressure pipe and the external diameter of the two, and described heat tracing pipe and temperature tube are the most tangent with the external diameter of positive pressure pipe, negative pressure pipe.
- Measurement apparatus the most according to claim 3, it is characterised in that: described positive differential pressure communicating pipe and be the tee T comprising a dirt ash room negative differential pressure could communicating pipe.
- Measurement apparatus the most according to claim 4, it is characterised in that: the plurality of collection tube is arranged in parallel, described positive pressure port equidistant placement, described negative pressure port equidistant placement, and described positive pressure port and negative pressure port are positioned at the same position of collection tube length direction.
- 6. according to the measurement apparatus described in claim 1,2,3,4 or 5, it is characterised in that: in described negative pressure pipe, it is provided with preventing clogging up device；Described preventing clogging up device includes the rotary shaft being arranged in described negative pressure pipe, and be connected with described rotary shaft in being arranged on described negative pressure pipe carries out promoting the blockage resisting blade rotated by the flue gas entered from described negative pressure port.
- 7. according to the measurement apparatus described in claim 1,2,3,4 or 5, it is characterized in that: described flue gas flow measuring unit is made up of differential pressure pick-up, static pressure transducer and data acquisition circuit, two pressure acquisition pipes of described differential pressure pick-up are respectively communicated with described positive differential pressure communicating pipe and negative differential pressure could communicating pipe for measuring pressure reduction；Static pressure transducer collection tube was connected for measuring static pressure with negative differential pressure could communicating pipe；Data acquisition circuit gathers static pressure transducer, differential pressure pick-up and the signal of temperature sensor, changes into the flow of flue gas.
- Measurement apparatus the most according to claim 7, it is characterized in that: described flue gas pollutant measuring unit includes a three-way magnetic valve, one flue gas premixed device, one flue gas analyzer and data acquisition circuit, the outlet of negative differential pressure could communicating pipe is connected with three-way magnetic valve air inlet, one end, gas outlet of three-way magnetic valve is connected with flue gas premixed device import, the three-way magnetic valve gas outlet other end is connected with the negative pressure inlet mouth of flue gas flow measuring unit, the outlet of flue gas premixed device is connected with flue gas analyzer, data acquisition circuit gathers the signal of telecommunication of flue gas analyzer, change into the concentration of pollutant in flue gas.
- 9. a flue gas flow and pollutant integral measurement method, it is characterised in that: use the arbitrary described measurement apparatus of claim 1-8 to measure.
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Application publication date: 20160817 |