CN207197590U - A kind of power station denitration grid uiform section multiple spot differential pressure flue gas flow measuring system - Google Patents

A kind of power station denitration grid uiform section multiple spot differential pressure flue gas flow measuring system Download PDF

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Publication number
CN207197590U
CN207197590U CN201721277437.5U CN201721277437U CN207197590U CN 207197590 U CN207197590 U CN 207197590U CN 201721277437 U CN201721277437 U CN 201721277437U CN 207197590 U CN207197590 U CN 207197590U
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measuring
flue gas
measuring cylinder
gas flow
nox
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张福建
程玲玲
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Nanjing Tongluo Automation Technology Co Ltd
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Nanjing Tongluo Automation Technology Co Ltd
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Abstract

The utility model provides a kind of power station denitration grid uiform section multiple spot differential pressure flue gas flow measuring system, more particularly to flue gas field of measuring technique after power plant desulfurization denitration, first measuring cylinder including back-blowing device and in sampling flue, several second measuring cylinders and Duo Gen probe tubes, the back-blowing device is connected with first measuring cylinder, NOx flue gas measuring probes are equipped with first measuring cylinder and second measuring cylinder, first measuring cylinder described in all second measuring cylinder parallel communications, second measuring cylinder described in several described probe tube parallel communications, the probe tube is provided with multiple thief holes met to flue gas flow direction, the thief hole is distributed in the cigarette field of the sampling flue in mesh point.The utility model can be used in the inhomogeneities for solving the denitration SCR outlets sample point that domestic fired power generating unit is widely present, and solve the problems, such as denitration outlet NOx measurement and the NOX measured deviations at smoke stack emission mouth.

Description

A kind of power station denitration grid uiform section multiple spot differential pressure flue gas flow measuring system
Technical field
The utility model belongs to flue gas field of measuring technique after power plant desulfurization denitration, and in particular to a kind of power station denitration grid Uiform section multiple spot differential pressure flue gas flow measuring system
Background technology
At present, China's environmental improvement is in the forward stage of bearing a heavy burden, and also needs to go into overdrive, assaults fortified position with all strength.2017, China It will implement comprehensively《" 13 " ecological environmental protection is planned》, deeply implement big gas and water, Soil Pollution Control action plan, it is complete Kind long-range monitoring Quality Monitoring Control System.In the case where Environmental is increasingly paid attention to, the pressure that power plant faces is certainly Meeting will be increasing.Because power plant's sampling test point by mounting condition because being limited, denitration CEMS sampling test points are substantially unsatisfactory for《Gu Determine particulate matter measure and the gaseous contaminant method of sampling in pollution sources exhaust》Point position is wanted in GB/T16157-1996 Ask, be also unsatisfactory for the requirement of thermal technology's sampling test point, cause measurement data relatively large deviation to be present with actual value.Again because current flue gas It is sampled as extraction-type to sample, exhaust gas components skewness in flue, the sample gas for causing to adopt is without representativeness, existing measurement knot Fruit exist environment protection digital be not inconsistent it is logical, denitration outlet NOx and actual value data deviation it is big, cause data to have the situation of conflict, Have influence on green audit and control of the operations staff to ammonia spraying amount.
Just following problems may be encountered in this case:
1st, the NOx measurements before and after desulphurization and denitration are inaccurate, can influence ammonia spraying amount because the NOx that desulphurization and denitration exports is to use In an important parameter of DCS control ammonia spraying amounts, if value measurement is inaccurate, certainly will cause ammonia crosses spray or few spray, directly affects DS NOx Est value is up to standard.
2nd, desulphurization and denitration NOX measurements are inaccurate, environmental pollution caused by taking 600MW units as an example, by annual 5000 hours run Calculate, the year ammonia spraying amount of 1 unit is about 1200T, and liquefied ammonia is converted to gas ammonia, and it is 700 that it, which expands multiple value,.Ammonia spraying amount is excessive, meeting Cause the ammonia of escape to be diffused into air, easily form haze with micronic dust, surrounding environment is polluted.
If the NOx measurement for the 3, causing desulphurization and denitration catalyst poisoning desulphurization and denitration to export is bigger than normal, DCS meeting increases automatically Add ammonia spraying amount.Due to the smoke distribution inequality of SCR catalyst layer, ammonia is excessive easily adheres to Sulfates thing in catalyst surface for spray Matter, these sulfate species can cause catalyst poisoning, cause catalyst activity reduction, and to detect poisoning and generally require to shut down It could carry out.Thus, it is found that poisoning is essentially all permanent poisoning, its catalytic performance can not be recovered.
4th, air preheater is caused to block, if ammonia spraying amount is too high, ammonia density is too high, and the forward direction of ammonia and nitrogen oxides can be promoted anti- It should accelerate so that reaction product is the increase of bisulfite ammonia amount.The material is a kind of high viscous liquid material, and easily condensation is deposited on Air preheater heat exchange element surface, is bonded together with fly ash granule in flue gas, blocks the passage of flue gas, increases air preheater pressure difference Height, increase resistance of the flue gas by air preheater, heat exchange efficiency reduces, and needs stoppage in transit unit to carry out maintenance cleaning under serious conditions.
Therefore it is badly in need of a kind of inequality that can be used in solving the denitration SCR outlets sample point that domestic fired power generating unit is widely present Even property, solve the problems, such as denitration outlet NOx measurement and the power station denitration grid uiform section of the NOX measured deviations at smoke stack emission mouth Multiple spot differential pressure flue gas flow measuring system.
Utility model content
The purpose of this utility model is to provide a kind of power station denitration grid uiform section multiple spot differential pressure flue gas flow measuring system, It can be used in the inhomogeneities for solving the denitration SCR outlets sample point that domestic fired power generating unit is widely present, solve denitration outlet NOX Measured value and the NOX measured deviation problems at smoke stack emission mouth.
The utility model provides following technical scheme:
A kind of power station denitration grid uiform section multiple spot differential pressure flue gas flow measuring system, including back-blowing device and be located at Sample first measuring cylinder, several second measuring cylinders and the Duo Gen probe tubes in flue, the back-blowing device and described the One measuring cylinder is connected, in one end of the close back-blowing device of first measuring cylinder and one end of second measuring cylinder Provided with NOx flue gas measuring probes, the remote of the first measuring cylinder described in all second measuring cylinder parallel communications is provided with the NOx One end of flue gas measuring probe, the remote of the second measuring cylinder described in several described probe tube parallel communications are provided with the NOx cigarettes One end of gas measuring probe, the probe tube are provided with multiple thief holes met to flue gas flow direction, and the thief hole is in the sampling It is distributed in the cigarette field of flue in mesh point.The back-blowing device keeps first measuring cylinder, the second measurement by blowback effect It is unimpeded in cylinder and probe tube, free from dust obstruction;The remote of first measuring cylinder described in all second measuring cylinder parallel communications sets There is one end of the NOx flue gases measuring probe, the remote of the second measuring cylinder described in several described probe tube parallel communications is provided with One end of the NOx flue gases measuring probe, in order to ensure the NOx flue gases measuring probe measurement in first measuring cylinder It is the mixed mixed flue gas of flue gas in second measuring cylinder of all connection first measuring cylinders, described second measures What the NOx flue gases measuring probe in cylinder measured is the mixing in the probe tubes of all connection second measuring cylinders The mixed flue gas of flue gas afterwards.NOx flue gas measuring probes are equipped with first measuring cylinder and second measuring cylinder, can be with Difference between the flue gas of judgment part mixing and the flue gas measurement all mixed, so as to be advantageous to the measurement adjustment side in later stage Case.The thief hole is distributed in the cigarette field of the sampling flue in mesh point, is the multiple spot used based on flue gas environmental monitoring Sampling theory, i.e., by the way that each point is measured or extracted simultaneously in flue gas flow area, flue gas is mixed and measured again, is protected Demonstrate,prove the accuracy that the measurement of the high-precision flow in the case of short and straight pipe section, flow field turbulent flow namely ensures measurement.
Preferably, the NOx flue gases measuring probe respectively with first measuring cylinder and second measuring cylinder Pipeline is inserted in first measuring cylinder and second measuring cylinder in 5 degree of angles are oblique.The NOx flue gases measuring probe and pipeline It is consistent with flue gas flow direction in the oblique insertion pipeline in 5 degree of angles.The NOx flue gases measuring probe is connected with pipeline using flange, flange Disk size is consistent with the NOx flue gases measuring probe mounting flange size.
Preferably, the NOx flue gases measuring probe is externally provided with ceramic protective sleeve pipe.Protect the NOx flue gases measuring probe In order to avoid by the abrasion of dust etc., so as to increase the service life of the NOx flue gases measuring probe.
Preferably, the close measurement site in the gap between the ceramic protective sleeve pipe and the NOx flue gases measuring probe End be provided with and prevent filter screen that dust is dropped in the ceramic protective sleeve pipe.When dust is by gravity or the back-blowing device Effect when can drop, be easily stuck in the gap of the NOx flue gases measuring probe and the ceramic protective sleeve pipe, influence to measure Precision, cause measurement delay, provided with the filter screen dust can be avoided to fall into the NOx flue gases measuring probe and the ceramics guarantor In the gap of protecting pipe, so as to be advantageous to the accuracy of measurement.
Preferably, the number of the thief hole is 24-36.In theory, it is more that points are extracted, it is more representative, but Excessive sample point be clearly it is unpractical can not also realize, according to cross-sectional sizes, 24 points to 36 points measurements just think have substantially It is representative.
Preferably, the probe tube is welded on by angle steel or stainless steel tube in the side wall of the sampling flue, and described The solder side of the probe tube of sampling flue welding is provided with projection.It is weldingly fixed on using angle steel on the inside of the sampling flue, The outlet section of the probe tube carries out dual face seals welding with the sampling flue.In welding process, the pipe of the probe tube Wall can melt it is thinning, it is easily damaged, cause poor sealing, set with the solder side of the probe tube of the sampling flue welding The problem of having projection to be welded at the projection, the probe tube breakage would not be caused to influence sealing, occurs.
Preferably, it is provided with groove in the projection.Solder is directly entered in the groove and the sampling flue during welding The more fastening of welding is firm.
Preferably, first measuring cylinder is provided with the suction pump for exhausting close to one end of the back-blowing device.Work as cigarette Grey flow velocity can use the suction pump exhausting when too low, accelerate the flow velocity of flue gas.
The beneficial effects of the utility model are:It can be used in solving the denitration SCR outlets that domestic fired power generating unit is widely present The inhomogeneities of sample point, solve the problems, such as denitration outlet NOx measurement and the NOX measured deviations at smoke stack emission mouth.
Brief description of the drawings
Accompanying drawing is used for providing further understanding to of the present utility model, and a part for constitution instruction, with this practicality New embodiment is used to explain the utility model together, does not form to limitation of the present utility model.In the accompanying drawings:
Fig. 1 is the utility model structure diagram;
Fig. 2 is part distribution schematic diagram of the thief hole in flue is sampled;
Fig. 3 is the structural relation figure of NOx flue gases measuring probe of the present utility model and ceramic protective sleeve pipe;
Fig. 4 is the part-structure schematic diagram of probe tube of the present utility model.
Wherein in figure mark for:1st, back-blowing device;2nd, the first measuring cylinder;3rd, the second measuring cylinder;4th, probe tube;41st, sample Hole;42nd, projection;421st, groove;5th, NOx flue gases measuring probe;6th, ceramic protective sleeve pipe;7th, filter screen;8th, flue is sampled.
Embodiment
As Figure 1-4, a kind of power station denitration grid uiform section multiple spot differential pressure flue gas flow measuring system, including blowback dress Put 1 and first measuring cylinder 2, several second measuring cylinders 3 and Duo Gen probe tubes 4 in sampling flue 8, blowback Device 1 is connected with the first measuring cylinder 2, in one end of one end of the close back-blowing device 1 of the first measuring cylinder 2 and the second measuring cylinder 3 NOx flue gases measuring probe 5 is equipped with, the remote NOx flue gases that are provided with of all the first measuring cylinders of parallel communication 2 of second measuring cylinder 3 are surveyed One end of amount probe 5, the remote of several the second measuring cylinders of parallel communication 3 of probe tube 4 are provided with the one of NOx flue gases measuring probe 5 End, probe tube 4 are provided with multiple thief holes 41 met to flue gas flow direction, and thief hole 41 is in mesh point in the cigarette field of sampling flue 8 Distribution.Probe tube 4 is welded on by angle steel or stainless steel tube in the side wall of sampling flue 8, and sampling is weldingly fixed on using angle steel The inner side of flue 8, outlet section and the sampling flue 8 of probe tube 4 carry out dual face seals welding.The number of thief hole 41 is 24-36, In theory, extract more, the more representative but excessive sample point of counting be clearly it is unpractical can not also realize, according to Cross-sectional sizes, 24 points to 36 points measurements just think representative substantially.Back-blowing device 1 keeps the first measurement by blowback effect It is unimpeded in the 2, second measuring cylinder 3 of cylinder and probe tube 4, free from dust obstruction;All the first measuring cylinders of parallel communication 2 of second measuring cylinder 3 Away from the one end for being provided with NOx flue gases measuring probe 5, several the second measuring cylinders of parallel communication 3 of probe tube 4 away from being provided with One end of NOx flue gases measuring probe 5, what it is in order to ensure the measurement of NOx flue gases measuring probe 5 in the first measuring cylinder 2 is all companies The mixed mixed flue gas of flue gas in second measuring cylinder 3 of logical first measuring cylinder 2, the NOx flue gases measurement in the second measuring cylinder 3 What probe 5 measured is the mixed flue gas of the mixed flue gas in the probe tubes 4 of all connection second measuring cylinders 3.First surveys In the measuring cylinder 3 of graduated cylinder 2 and second it is equipped with NOx flue gases measuring probe 5, it can be determined that the flue gas and all mix that part mixes Difference between flue gas measurement, so as to be advantageous to the measurement Adjusted Option in later stage.Thief hole 41 sampling flue 8 cigarette field in be in Mesh point is distributed, and is the multi-point sampling theory used based on flue gas environmental monitoring, i.e., by flue gas flow area while to each Point is measured or extracted, and flue gas is mixed and measured again, ensures the high accuracy stream in the case of short and straight pipe section, flow field turbulent flow Measurement namely ensures the accuracy of measurement.
Specifically, NOx flue gases measuring probe 5 is in respectively 5 degree with the pipeline in the first measuring cylinder 2 and the second measuring cylinder 3 In angle the first measuring cylinder 2 of oblique insertion and the second measuring cylinder 3.NOx flue gases measuring probe 5 and the first measuring cylinder 2 and the second measurement It is consistent with flue gas flow direction in the oblique insertion pipeline in 5 degree of angles of pipeline in cylinder 3.NOx flue gases measuring probe 5 and the first measuring cylinder 2 and Pipeline in second measuring cylinder 3 is connected using flange, ring flange size and the mounting flange size one of NOx flue gases measuring probe 5 Cause.NOx flue gases measuring probe 5 is externally provided with ceramic protective sleeve 6 and managed.NOx flue gases measuring probe 5 is protected in order to avoid mill by dust etc. Damage, so as to increase the service life of NOx flue gases measuring probe 5.
Specifically, ceramic protective sleeve 6 manages the end in the close measurement site in the gap between NOx flue gases measuring probe 5 Provided with the filter screen 7 for preventing that dust from dropping in the pipe of ceramic protective sleeve 6.The meeting when effect of the dust by gravity or back-blowing device 1 From dropping, easily it is stuck in the gap of NOx flue gases measuring probe 5 and the pipe of ceramic protective sleeve 6, influences measurement accuracy, cause to measure Hysteresis, can avoid dust from falling into the gap of NOx flue gases measuring probe 5 and the pipe of ceramic protective sleeve 6, so as to have provided with filter screen 7 Beneficial to the accuracy of measurement.
Specifically, the solder side of the probe tube 4 welded with sampling flue 8 is provided with projection 42.In welding process, probe tube 4 tube wall can melt thinning, easy breakage, cause poor sealing, and the solder side of the probe tube 4 welded with sampling flue 8 is set The problem of having projection 42 to be welded at projection 42, the breakage of probe tube 4 would not be caused to influence sealing, occurs.
Specifically, it is provided with groove 421 in projection 42.Solder is directly entered in groove 421 during welding welds with sampling flue 8 More fastening it is firm.
The advantages of the present embodiment, is as follows:
1st, it can be used in the inhomogeneities for solving the denitration SCR outlets sample point that domestic fired power generating unit is widely present, solve Denitration exports NOx measurement and the NOX measured deviation problems at smoke stack emission mouth.;
2nd, it is equipped with NOx flue gases measuring probe 5 in the first measuring cylinder 2 and the second measuring cylinder 3, it can be determined that what part mixed Difference between flue gas and the flue gas measurement all mixed, can contrast and preferably judge the NOx's for sampling the flue gas in flue 8 Concentration.
The installation method of the present embodiment:
1st, A/B sides are exported on vertical sampling flue 8 and more probe tubes 4 is respectively set, be horizontally inserted vertical sampling flue 8, the pipeline of every probe tube 4 takes several thief holes 41, and thief hole 41 is met to flue gas flow direction and arranged;Probe tube 4 is in sampling cigarette The domestic demand of road 8 is fixed, and the inner side of sampling flue 8 is weldingly fixed on using angle steel or stainless steel tube, the outlet section of probe tube 4 is with taking Sample flue 8 carries out dual face seals welding.Need to build a workbench scaffold, convenient construction team inside sampling flue 8 5 work and personal safety protection;
2nd, reducing twice is carried out at the pipeline of measuring table vertical sampling pipe 4 first measuring cylinder 2 is installed, in the first measurement 5 degree of angles of pipeline of the Pipe installing NOx flue gases measuring probe 5 of cylinder 2, NOx flue gases measuring probe 5 and the first measuring cylinder 5 are oblique to insert Enter in pipeline, it is consistent with flue gas flow direction.NOx flue gases measuring probe 5 is connected with the pipeline of the first measuring cylinder 5 using flange, flange Disk size is consistent with probe mounting flange size.
Preferred embodiment of the present utility model is the foregoing is only, is not limited to the utility model, although ginseng The utility model is described in detail according to previous embodiment, for those skilled in the art, it still can be with Technical scheme described in foregoing embodiments is modified, or equivalent substitution is carried out to which part technical characteristic.It is all Within the spirit and principles of the utility model, any modification, equivalent substitution and improvements made etc., this practicality should be included in Within new protection domain.

Claims (8)

1. a kind of power station denitration grid uiform section multiple spot differential pressure flue gas flow measuring system, it is characterised in that including back-blowing device And first measuring cylinder, several second measuring cylinders and Duo Gen probe tubes in sampling flue, the blowback dress Put and be connected with first measuring cylinder, one end of the close back-blowing device of first measuring cylinder and second measuring cylinder One end in be equipped with NOx flue gas measuring probes, the first measuring cylinder is remote described in all second measuring cylinder parallel communications One end provided with the NOx flue gases measuring probe, the remote of the second measuring cylinder described in several described probe tube parallel communications set There is one end of the NOx flue gases measuring probe, the probe tube is provided with multiple thief holes met to flue gas flow direction, the thief hole It is distributed in the cigarette field of the sampling flue in mesh point.
2. power station denitration grid uiform section multiple spot differential pressure flue gas flow measuring system according to claim 1, its feature exist In the NOx flue gases measuring probe is respectively oblique in 5 degree of angles with the pipeline in first measuring cylinder and second measuring cylinder Into insertion first measuring cylinder and second measuring cylinder.
3. power station denitration grid uiform section multiple spot differential pressure flue gas flow measuring system according to claim 1 or 2, its feature It is, the NOx flue gases measuring probe is externally provided with ceramic protective sleeve pipe.
4. power station denitration grid uiform section multiple spot differential pressure flue gas flow measuring system according to claim 3, its feature exist In the end in the close measurement site in the gap between the ceramic protective sleeve pipe and the NOx flue gases measuring probe, which is provided with, prevents The filter screen that only dust is dropped in the ceramic protective sleeve pipe.
5. power station denitration grid uiform section multiple spot differential pressure flue gas flow measuring system according to claim 1, its feature exist In the number of the thief hole is 24-36.
6. power station denitration grid uiform section multiple spot differential pressure flue gas flow measuring system according to claim 1, its feature exist In the probe tube is welded on by angle steel or stainless steel tube in the side wall of the sampling flue, with the sampling flue welding The solder side of the probe tube be provided with projection.
7. power station denitration grid uiform section multiple spot differential pressure flue gas flow measuring system according to claim 6, its feature exist In the projection is interior to be provided with groove.
8. power station denitration grid uiform section multiple spot differential pressure flue gas flow measuring system according to claim 1, its feature exist In first measuring cylinder is provided with the suction pump for exhausting close to one end of the back-blowing device.
CN201721277437.5U 2017-09-30 2017-09-30 A kind of power station denitration grid uiform section multiple spot differential pressure flue gas flow measuring system Active CN207197590U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110987547A (en) * 2019-12-17 2020-04-10 广州中电荔新电力实业有限公司 Flue gas monitoring system of flue denitration export

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110987547A (en) * 2019-12-17 2020-04-10 广州中电荔新电力实业有限公司 Flue gas monitoring system of flue denitration export

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