CN110530684A - A kind of boiler of power plant exhaust gas components sampler, measuring system and method - Google Patents
A kind of boiler of power plant exhaust gas components sampler, measuring system and method Download PDFInfo
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- CN110530684A CN110530684A CN201910767362.6A CN201910767362A CN110530684A CN 110530684 A CN110530684 A CN 110530684A CN 201910767362 A CN201910767362 A CN 201910767362A CN 110530684 A CN110530684 A CN 110530684A
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- flue gas
- gun body
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
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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
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/2247—Sampling from a flowing stream of gas
- G01N1/2258—Sampling from a flowing stream of gas in a stack or chimney
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- 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
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
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- Sampling And Sample Adjustment (AREA)
Abstract
The present invention relates to a kind of boiler of power plant exhaust gas components samplers, measuring system and method, including gun body, the gun body, which passes through, probe tube, backing tube and thermocouple well, probe tube, backing tube and thermocouple well both ends extend out to outside gun body and are fixedly connected with gun body, the probe tube is used to flue gas introducing flue gas analysis device, the backing tube with speed measuring device for connecting, measure the flow velocity of flue gas, the thermocouple well is used to measure the temperature of flue gas, the present invention has fully considered velocity of flue gas field and temperature profile effect, it is accurate for the measurement result of exhaust gas components.
Description
Technical field
The present invention relates to flue gas technical field of measuring equipment, and in particular to a kind of boiler of power plant exhaust gas components sampler,
Measuring system and method.
Background technique
Exhaust gas components in power plant in measurement boiler flue are generally taken takes multiple points to carry out on a measurement section
The method of independent measurement, this section, which is generally located on upstream and downstream, the sufficiently long straight pipeline position that meets the requirements, and usually neglects
The slightly influence of speed, temperature change, then obtains exhaust gas components numerical value at section by the method for arithmetic average for measurement result.It is right
For the little length of certain changes of section and straight flue, flow field is relatively stable, ignore in this way speed, temperature change influence also
Acceptable, but inventors have found that in boiler this flue quantity be after all it is seldom, flow development length is limited, seldom
Requirement can be reached, be more band turn, variable cross-section, straight pipe is short, have vortex, there is dead area, to deflector or leans on
The pipeline of nearly rotating machinery such as air preheater, the concentration field of flue gas, velocity field and change of temperature field are very big in pipeline, this is in sky
Show especially prominent in air preheater inlet and outlet pipeline, for the flue of these types, speed, temperature change are to the shadow of measurement
Sound cannot have ignored, it is necessary to pay attention to and evaluate.And measuring speed, temperature, composition, then respective special equipment is needed,
Measurement velocity of flue gas needs standard pitot tube and difference gauge, and measurement flue-gas temperature needs thermocouple and its support frame and point thermometer,
Measurement exhaust gas components need sampler and flue gas analyzer, are inserted into three kinds of measuring devices respectively and measure it cannot be guaranteed that three
Parameter keeps synchronous reading, and being inserted into three kinds of measuring devices simultaneously then makes entire measuring system seem numerous and jumbled incomparable, on pipeline
The region of aperture becomes larger, and it is also time-consuming hard to operate, and more personnel is also needed to operate.In addition when need to measure temperature compared with
When high flue at such as furnace outlet, also the flue gas of measuring device and extraction is carried out it is effectively cooling such as external cooler,
To prevent high-temperature flue gas from damaging equipment, this has more a set of cooling system again, to keep entire measuring system more complicated.
Summary of the invention
The purpose of the present invention is in order to overcome the deficiencies of the prior art, providing a kind of boiler of power plant exhaust gas components sampler,
Applicability is wide, simple and reliable, and the data obtained after use are accurate, rigorous.
To achieve the above object, the present invention adopts the following technical solutions:
A kind of boiler of power plant exhaust gas components sampler, including gun body, the gun body, which passes through, probe tube, backing tube and heat
Galvanic couple pipe, probe tube, backing tube and thermocouple well both ends extend out to outside gun body and are fixedly connected with gun body, the thermocouple well
In thermocouple is installed, the probe tube is used to flue gas introducing flue gas analysis device, and the backing tube is used for and speed measuring device
Connection, measures the flow velocity of flue gas, and the thermocouple is used to measure the temperature of flue gas.
Further, the gun body is also fixedly connected with cooling medium inlet tube and cooling medium outlet, cooling medium
Inlet tube protrudes into inside gun body, and for being passed through cooling medium into gun body, the cooling medium outlet is for being discharged cooling Jie
Matter.
Further, the outer peripheral surface of the gun body is further fixed on handle, and the handle is vertical with the axis of gun body.
Further, the gun body is made of steel material.
A kind of boiler of power plant exhaust gas components measuring system, it is described using the boiler of power plant exhaust gas components sampler
Probe tube is connect with flue gas analysis device, and the backing tube is connect with speed measuring device, thermocouple and survey in the thermocouple well
Warm device connection.
Further, the flue gas analysis device uses flue gas analyzer.
Further, the speed measuring device uses electronics difference gauge.
Further, the temperature measuring equipment uses point thermometer.
The invention also discloses a kind of working methods of boiler of power plant exhaust gas components measuring system: surveying needed for gun body is inserted into
It measures inside flue, gun body axis and flue axis perpendicular measure the flow velocity of flue gas by speed measuring device, adjust flue gas analysis dress
The sample rate set makes the sample rate of flue gas analysis device be equal to the flow velocity for the flue gas that test device measurement obtains, utilizes cigarette
Gas analytical equipment obtains the composition of flue gas, obtains the temperature of flue gas using thermocouple and temperature measuring equipment.
Further, the boiler of power plant exhaust gas components measuring system working method comprising the following specific steps
Step (1): a section on measurement flue needed for taking is opening up gaging hole at pipeline location where section, by net
Lattice method divides section and obtains the position of each measuring point on grid；
Step (2): being inserted into flue for gun body, and backing tube, probe tube and thermocouple is made to reach a measuring point position on section
It sets.
Step (3): using the flow velocity of speed measuring device measurement flue gas, the sample rate of flue gas analysis device is adjusted, flue gas is made
The sample rate of analytical equipment is equal to the flow velocity for the flue gas that test device measurement obtains, using flue gas analysis device to exhaust gas components
It is analyzed, obtains the temperature of flue gas using thermocouple and temperature measuring equipment.
Step (4): the method for using step (2)-step (3) obtains the exhaust gas components and temperature of each measuring point on section.
Step (5): being modified the exhaust gas components of each measuring point, obtains exhaust gas components numerical value in whole cross section.
Beneficial effects of the present invention:
1. the present invention has backing tube and thermocouple, speed measuring device and temperature measuring equipment can be connected, flue gas is fully taken into account
Speed, temperature change can measure parameters to the great influence of measurement result simultaneously, by backing tube and speed measuring device,
The sample rate for adjusting flue gas analysis device can be facilitated, realize isokinetic sampling's analysis to flue gas, measurement result more can generation
Exhaust gas components at table measurement point and whole cross section, while measurement obtains speed, the temperature of flue gas, can fill in data analysis
Point evaluation because caused by the factors such as flue gas in flue concentration field is uneven, velocity field is uneven, temperature field is uneven to flue gas at
The influence of part measurement, make by speed, the measurement result of temperature adjustmemt is more accurate, it is more representative, have more convincingness.
2. sampler of the invention, the ability for adapting to different pipelines is strong, and integrated functionality is strong, to concentration field, velocity field and
The very big pipeline of change of temperature field can the composition of acquisition flue gas of constant speed, speed, temperature, can really reflect measurement
The exhaust gas components in region change, and the data obtained are accurate, rigorous, and whole system is simple and reliable, easy to use, can also be according to need
To use one such or several functions.
3. sampler of the invention has cooling medium inlet tube and cooling medium outlet, can carry out to flue gas
It is cooling, high-temperature flue gas damage flue gas analysis device and speed measuring device are prevented, the measurement demand of high-temperature area tunnel gas is met.
Detailed description of the invention
The accompanying drawings constituting a part of this application is used to provide further understanding of the present application, and the application's shows
Meaning property embodiment and its explanation do not constitute the restriction to the application for explaining the application.
Fig. 1 is 1 overall structure schematic front view of the embodiment of the present invention；
Fig. 2 is 1 overall structure schematic side view of the embodiment of the present invention；
Wherein, 1. gun body, 2. probe tubes, 3. backing tubes, 4. thermocouple wells, 5. cooling medium inlet pipes, 6. cooling mediums
Outlet, 7. handles.
Specific embodiment
It is noted that following detailed description is all illustrative, it is intended to provide further instruction to the application.Unless another
It indicates, all technical and scientific terms used herein has usual with the application person of an ordinary skill in the technical field
The identical meanings of understanding.
It should be noted that term used herein above is merely to describe specific embodiment, and be not intended to restricted root
According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singular
Also it is intended to include plural form, additionally, it should be understood that, when in the present specification using term "comprising" and/or " packet
Include " when, indicate existing characteristics, step, operation, device, component and/or their combination.
In order to facilitate narration, if there is "upper", "lower", " left side " " right side " printed words in the present invention, only expression and attached drawing itself
Upper and lower, left and right direction it is consistent, not to structure rise restriction effect, it is only for convenient for description the present invention and simplification retouch
It states, rather than the equipment of indication or suggestion meaning or element must have a particular orientation, and be constructed and operated in a specific orientation,
Therefore it is not considered as limiting the invention.
As background technique is introduced, existing flue gas sampling device make measurement and analysis instrument can not consider velocity field,
Unevenly to the influence of measurement result, cause measurement result inaccurate, in view of the above-mentioned problems, present applicant proposes one kind in temperature field
Boiler of power plant exhaust gas components sampler.
In a kind of exemplary embodiment embodiment 1 of the application, as shown in Figs. 1-2, a kind of boiler of power plant exhaust gas components are taken
Sampling device, includes gun body 1 made of steel material, and it is the end A that gun body, which is used to protrude into the end of pipeline, when use, and the other end is the end B,
Passing through in the gun body has probe tube 2, backing tube 3 and thermocouple well 4, is fixed with thermocouple in the thermocouple well, described to take
The both ends of sample pipe, backing tube and thermocouple well are pierced by gun body, and are welded and fixed and are connect with gun body, solid using welding
It is fixed, the gap between probe tube, backing tube and thermocouple well and gun body can be sealed, probe tube, backing tube and thermoelectricity
Even pipe can also be used other modes and be fixedly connected with gun body, and sealing ring, those skilled in the art are arranged between gun body
It can select to be fixedly connected with mode according to actual needs, herein without being described in detail.Probe tube, backing tube and thermocouple well are used for
It is extend out to outside gun body from the end A of gun body with the end of smoke contacts, the other end is extend out to outside gun body from the end B of gun body.
The length of the thermocouple well is less than the length of probe tube and backing tube, and thermocouple can be made to expose measuring head, make thermocouple end
Portion, backrest tube end and sampling tube end can reach at the same point position.
The gun body is also fixedly connected with the cooling medium inlet pipe 5 of L-type, and cooling medium inlet pipe is stretched from the end A of gun body
Enter inside gun body, and stretch at another end position of gun body, cooling medium inlet pipe is welded and fixed with gun body, cooling medium
Inlet tube can inject cooling medium, such as cooling water, compressed air, for cooling down to flue gas, the rifle into gun body
It is also connected with cooling medium outlet 6 on the side wall of the B end position of body, for cooling medium to be discharged.
The probe tube, backing tube and thermocouple are all made of existing equipment, and specific structure is herein without detailed
Narration.
Two handles 7 are welded on the end outer circumference surface of the gun body, the handle is vertical with the axis of gun body
Setting guarantees that gun body will not be crooked when measurement, to influence measurement accuracy.
Embodiment 2:
Present embodiment discloses a kind of boiler of power plant exhaust gas components measuring systems, including boiler of power plant described in embodiment 1
Exhaust gas components sampler.
For protruding into flue, the other end is connect with flue gas analysis device, can be by the cigarette in flue for described probe tube one end
Conductance enters flue gas analysis device, and the flue gas analysis device uses existing flue gas analyzer.
One end is for protruding into flue, the measuring head energy of the one end for the thermocouple installed in thermocouple well in the thermocouple well
It enough protrudes into flue, the other end of thermocouple is connect with temperature measuring equipment, and the temperature measuring equipment is using point thermometer or has thermometric function
The multimeter of energy can be directly by thermocouple and flue gas point if the flue gas analyzer connecting with probe tube has temp sensing function
Analyzer connection.
For protruding into flue, the other end is connect with speed measuring device for described backing tube one end, and the speed measuring device uses electronics
Difference gauge can obtain the flow velocity of flue gas by measuring the pressure difference of flue gas.
Embodiment 3:
Present embodiment discloses a kind of working methods of boiler of power plant exhaust gas components measuring system, comprising the following steps:
Step (1): any one section on measurement flue needed for taking is opening up gaging hole at pipeline location where section, is pressing
Gridding method divides section and obtains the position of each measuring point on grid.
Specifically, pressing gridding method dividing sample section, by taking rectangular section as an example, size are as follows: long L × wide H is drawn by gridding method
Point sampling section, amount to a × b mesh point, obtain the position coordinates P (x, y) of each mesh point, wherein x=(1, a), y=(1,
b)；Wherein a indicates the point number on the direction x, and b indicates the point number on the direction y.
Step (2): gun body is inserted into inside pipeline by gaging hole, makes probe tube, the measuring head of thermocouple and backrest pipe end
Portion reaches the position of a measuring point on section.
Step (3): the velocity of flue gas Vxy at a mesh point P (x, y) is measured using backing tube and electronics difference gauge, is adjusted
The sample rate for saving flue gas analyzer makes the sample rate of flue gas analyzer be equal to the stream for the flue gas that the measurement of electronics difference gauge obtains
Fast Vxy, it is a certain required for being measured at this mesh point P (x, y) with flue gas analyzer, gas sampling probe, thermocouple and point thermometer
(q can be O by kind or a variety of exhaust gas components qxy2、CO2、CO、NO、SO2、SO3With other composition such as NH for needing to measure3Deng), temperature
Txy is spent, records the measurement beginning and ending time txy of this point, (these numerical value can be instantaneous value, be also possible to by record Vxy, qxy, Txy
This puts the arithmetic mean of instantaneous value of measured value in a period of time)；
Step (4): the method for using step (2)-step (3), obtain on section the exhaust gas components of other each measuring points and
Temperature.
Step (5) is modified the exhaust gas components of each measuring point according to the flue-gas temperature and speed of obtained each measuring point,
Obtain exhaust gas components numerical value in whole cross section.
Step (5) method particularly includes:
Step (a): temperature correction coefficient lt, xy, the speed correction factor of each point within a sampling and measuring period are calculated
lv,xy；
Step (b): the exhaust gas components obtained according to the temperature correction coefficient of each point, speed correction factor and measurement, meter
Calculation obtains the various composition Qxy of the revised flue gas of each point；
Qxy=qxy × lv, xy/lt, xy
Step (c): arithmetic average obtains a certain composition numerical value Q of flue gas at whole cross section in the sampled measurements period,
Same method is it can be concluded that other compositions in flue gas.
When calculating other types section, the calculating of previous step (a), step (b), update the system in step (c)
The calculation method of the various composition Qxy of method, flue gas and in the sampled measurements period at whole cross section flue gas a certain kind at number
The calculation method of value Q etc. is identical, and uniquely difference is not that the value of a, b are different, and a, b value after different cross section segmentation are
Different.
In the present embodiment, when needing to measure the exhaust gas components in the higher flue of temperature (such as at furnace outlet),
Before step (2) carries out, cooling water or compressed air are passed through in cooling medium inlet pipe in advance, gun body is then passed through into gaging hole
It is inserted into flue, the flue gas of extraction can be cooled down, high-temperature flue gas damage measuring device and analysis instrument are prevented.
The measuring system of the present embodiment has backing tube and thermocouple well, can connect speed measuring device and temperature measuring equipment, fill
Divide in view of velocity of flue gas, temperature change are to the great influence of measurement result, parameters can be measured simultaneously, pass through backing tube
And speed measuring device, the sample rate for adjusting flue gas analysis device can be facilitated, realize isokinetic sampling's analysis to flue gas, measurement
As a result more representative of the exhaust gas components at measurement point and whole cross section, while measurement obtains speed, the temperature of flue gas, in data point
Caused by can sufficiently being evaluated in analysis because of the factors such as flue gas in flue concentration field is uneven, velocity field is uneven, temperature field is uneven
The influence to exhaust gas components measurement, make by speed, the measurement result of temperature adjustmemt is more accurate, it is more representative, have more
Convincingness.
The measuring system of the present embodiment, the ability for adapting to different pipelines is strong, and integrated functionality is strong, to concentration field, velocity field and
The very big pipeline of change of temperature field can the composition of acquisition flue gas of constant speed, speed, temperature, can really reflect measurement
The exhaust gas components in region change, and the data obtained are accurate, rigorous.
The present embodiment has the function of measuring flue gas flow rate, composition and speed, can use as needed one such
Or several functions.
Above-mentioned, although the foregoing specific embodiments of the present invention is described with reference to the accompanying drawings, not protects model to the present invention
The limitation enclosed, those skilled in the art should understand that, based on the technical solutions of the present invention, those skilled in the art are not
Need to make the creative labor the various modifications or changes that can be made still within protection scope of the present invention.
Claims (10)
1. a kind of boiler of power plant exhaust gas components sampler, which is characterized in that including gun body, the gun body pass through have probe tube,
Backing tube and thermocouple well, probe tube, backing tube and thermocouple well both ends extend out to outside gun body and are fixedly connected with gun body, institute
It states and thermocouple is installed in thermocouple well, the probe tube is used to flue gas introducing flue gas analysis device, and the backing tube is used for
It is connect with speed measuring device, measures the flow velocity of flue gas, the thermocouple is used to measure the temperature of flue gas.
2. a kind of boiler of power plant exhaust gas components sampler as described in claim 1, which is characterized in that the gun body is also fixed
It is connected with cooling medium inlet tube and cooling medium outlet, cooling medium inlet tube protrudes into inside gun body, for into gun body
It is passed through cooling medium, the cooling medium outlet is for being discharged cooling medium.
3. a kind of boiler of power plant exhaust gas components sampler as described in claim 1, which is characterized in that the periphery of the gun body
Face is further fixed on handle, and the handle is vertical with the axis of gun body.
4. a kind of boiler of power plant exhaust gas components sampler as described in claim 1, which is characterized in that the gun body uses steel
Material is made.
5. a kind of boiler of power plant exhaust gas components detection system, which is characterized in that including the described in any item power plant of claim 1-4
Boiler smoke composition sampler, the probe tube are connect with flue gas analysis device, and the backing tube is connect with speed measuring device, institute
Thermocouple is stated to connect with temperature measuring equipment.
6. a kind of boiler of power plant exhaust gas components detection system as claimed in claim 5, which is characterized in that the flue gas analysis dress
It sets using flue gas analyzer.
7. a kind of boiler of power plant exhaust gas components detection system as claimed in claim 5, which is characterized in that the speed measuring device is adopted
With electronics difference gauge.
8. a kind of boiler of power plant exhaust gas components detection system as claimed in claim 5, which is characterized in that the temperature measuring equipment is adopted
Use point thermometer.
9. a kind of working method of the described in any item boiler of power plant exhaust gas components detection systems of claim 5-8, feature exist
In inside measurement flue needed for being inserted into gun body, gun body axis and flue axis perpendicular measure flue gas by speed measuring device
Flow velocity adjusts the sample rate of flue gas analysis device, so that the sample rate of flue gas analysis device is equal to test device measurement and obtains
Flue gas flow velocity, obtain the composition of flue gas using flue gas analysis device, obtain the temperature of flue gas using thermocouple and temperature measuring equipment
Degree.
10. method as claimed in claim 9, which is characterized in that comprising the following specific steps
Step (1): a section on measurement flue needed for taking is opening up gaging hole at pipeline location where section, by gridding method
It divides section and obtains the position of each measuring point on grid；
Step (2): being inserted into flue for gun body, and backing tube, probe tube and thermocouple well is made to reach a point position on section；
Step (3): using the flow velocity of speed measuring device measurement flue gas, the sample rate of flue gas analysis device is adjusted, flue gas analysis is made
The sample rate of device is equal to the flow velocity for the flue gas that test device measurement obtains, and is carried out using flue gas analysis device to exhaust gas components
Analysis, obtains the temperature of flue gas using thermocouple and temperature measuring equipment；
Step (4): the method for using step (2)-step (3) obtains the exhaust gas components and temperature of each measuring point on section；
Step (5): being modified the exhaust gas components of each measuring point, obtains exhaust gas components numerical value in whole cross section.
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| CN111337545B (en) * | 2019-12-24 | 2023-04-07 | 中国特种设备检测研究院 | Device and method for measuring moisture content of rapid supersaturated flue gas facing wind |
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| CN111339716B (en) * | 2020-02-19 | 2022-07-22 | 浙江大学 | Boiler high-temperature flue gas flow field online agent model construction method |
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