CN216955914U - A gas turbine outlet flue NOx concentration rapid survey system for deNOx systems - Google Patents
A gas turbine outlet flue NOx concentration rapid survey system for deNOx systems Download PDFInfo
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- CN216955914U CN216955914U CN202123007880.XU CN202123007880U CN216955914U CN 216955914 U CN216955914 U CN 216955914U CN 202123007880 U CN202123007880 U CN 202123007880U CN 216955914 U CN216955914 U CN 216955914U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/16—Combined cycle power plant [CCPP], or combined cycle gas turbine [CCGT]
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Abstract
The utility model provides a quick measuring system for NOx concentration of a gas turbine outlet flue of a denitration system, which relates to the technical field of flue gas denitration of a gas-steam combined cycle power station and comprises a sampling pipe, a measuring pipe, a return pipe and a quick NOx concentration measuring instrument; the lower end of the sampling tube is vertically inserted into the front end of the outlet flue of the gas turbine; the upper end of the sampling tube is connected with the front end of the measuring tube, the rear end of the measuring tube is connected with the upper end of the return tube, and the measuring tube is positioned outside the outlet flue of the gas turbine; the lower end of the return pipe is vertically inserted into the rear end of the outlet flue of the gas turbine; the side wall of the part of the sampling tube inserted into the outlet flue of the gas turbine is provided with a plurality of flue gas sampling ports, and the opening direction of the flue gas sampling ports is opposite to the flow direction of flue gas; the rapid NOx concentration measuring instrument is arranged on the measuring tube. The utility model relieves the technical problems that a single-measuring-point sampling device measures the concentration of NOx, certain hysteresis exists on the basis of the concentration of NOx at a denitration outlet, and certain error exists between a single-measuring-point sampling measurement value and an actual average value.
Description
Technical Field
The utility model relates to the technical field of flue gas denitration of a gas-steam combined cycle power station, in particular to a quick measurement system for NOx concentration in a gas turbine outlet flue of a denitration system.
Background
The main pollutant of the gas turbine is nitrogen oxide (NOx) generated in the combustion process, and the concentration content of the NOx in the flue gas is reduced by adopting a low-nitrogen combustor and an SCR denitration system in the conventional gas combined cycle unit. The SCR method, a selective catalytic reduction denitration technique, mainly utilizes the reduction characteristics of NH3 on NOx, and reduces NOx to N2 and H2O which are harmless to the environment under the action of a catalyst. In engineering practice, an ammonia injection grid is arranged at an inlet of an SCR denitration device for ammonia injection, and because ammonia has explosion hidden trouble, the ammonia is generally injected into a dilution air pipeline, and the ammonia concentration is diluted to be below 5% and then enters the ammonia injection grid. There are several ammonia spraying branch pipes, and each ammonia spraying branch pipe is provided with one branch pipe regulating valve and one in-situ flow meter.
When the load of the gas turbine changes, the concentration of NOx in the flue gas changes, and the ammonia injection amount needs to be adjusted in time so as to avoid secondary pollution caused by the fact that the concentration of NOx at an SCR outlet exceeds a limit value due to too low ammonia injection amount or a large amount of ammonia escapes due to too high ammonia injection amount, and therefore the control of the ammonia injection amount according to the related real-time concentration of the NOx in the flue gas is particularly important for improving the denitration efficiency. The SCR denitration device controls ammonia injection flow through an ammonia injection total amount control system according to an ammonia flow demand signal calculated according to NOx concentration in flue gas, and accurate real-time measurement is needed to be carried out on the NOx concentration in the flue gas.
The general flue gas gets into SCR denitrification entrance of denitrification facility through combustion engine export flue, reaches the denitration export through the denitration process. In principle, the ammonia injection amount in the denitration process should be adjusted according to the concentration of NOx at the denitration inlet.
At present, most of NOx concentration measurement adopts a traditional single-measuring-point sampling device, the concentration of a denitration outlet is measured, certain hysteresis is realized by taking the NOx concentration of the denitration outlet as a basis, and a single-measuring-point sampling measurement value and an actual average value have certain error in the actual operation process.
SUMMERY OF THE UTILITY MODEL
In view of this, the present invention aims to provide a system for rapidly measuring the NOx concentration in the outlet flue of the combustion engine, so as to alleviate the technical problem that most of the NOx concentration measurements are performed by using a conventional single-point sampling device at the NOx outlet, the NOx concentration at the NOx outlet has a certain hysteresis based on the conventional single-point sampling device, and a certain error exists between the single-point sampling measurement value and the actual average value during the actual operation process.
In order to achieve the purpose, the embodiment of the utility model adopts the following technical scheme:
a quick NOx concentration measuring system for a gas turbine outlet flue of a denitration system comprises a sampling pipe, a measuring pipe, a return pipe and a quick NOx concentration measuring instrument; the lower end of the sampling tube is vertically inserted into the front end of the outlet flue of the gas turbine; the upper end of the sampling tube is connected with the front end of the measuring tube, the rear end of the measuring tube is connected with the upper end of the return tube, and the measuring tube is positioned outside the outlet flue of the gas turbine; the lower end of the return pipe is vertically inserted into the rear end of the outlet flue of the gas turbine; a plurality of flue gas sampling ports are arranged on the side wall of the part of the sampling tube inserted into the outlet flue of the gas turbine, and the opening direction of the flue gas sampling ports is opposite to the flow direction of flue gas; the rapid NOx concentration measuring instrument is arranged on the measuring tube.
Furthermore, the sampling tube, the measuring tube and the return tube are made of high-temperature-resistant alloy materials.
Furthermore, a mixing pipe is arranged on the measuring pipe and is arranged in front of the NOx concentration rapid measuring instrument, and the diameter of the mixing pipe is larger than that of the measuring pipe.
Further, still include sample main valve and flowmeter, sample main valve and flowmeter set gradually in front of the hybrid tube.
Furthermore, the plurality of flue gas sampling ports are sequentially arranged on the part, located in the outlet flue of the combustion engine, of the sampling pipe from top to bottom according to the principle that the cross section of the flue is equal in area.
Further, the lower end port of the sampling tube is closed.
Compared with the prior art, the quick measuring system for the concentration of NOx in the outlet flue of the combustion engine for the denitration system has the following technical effects:
1. in the technical scheme, a sampling pipe, a measuring pipe and a return pipe are sequentially connected, the lower end of the sampling pipe is vertically inserted into the front end of an outlet flue of a gas turbine, the front end of the measuring pipe is connected with the upper end of the sampling pipe, the rear end of the measuring pipe is connected with the upper end of the return pipe, a flue gas sampling port is arranged on the side wall of the part of the sampling pipe inserted into the outlet flue of the gas turbine, the opening direction of the flue gas sampling port is opposite to the flow direction of flue gas, and because of the characteristic of high flow rate of the flue gas in the outlet flue of the gas turbine, the flue gas extraction power in the device is derived from the self momentum of the flue gas and the front-back pressure difference between the sampling pipe and the return pipe, so that the sampling of the differential pressure self-return flue gas is realized; the rapid measurement of the NOx concentration can be realized by the arrangement of the rapid NOx concentration measuring instrument; secondly, the arrangement of the plurality of flue gas sampling ports can realize the partitioned sampling of the flue gas, and compared with single-point sampling, the reliability is higher, and the deviation is smaller; the arrangement of the return pipe can enable the flue gas to flow back to the rear end of the outlet flue of the gas turbine after the measurement is finished, and subsequent denitration treatment is carried out, so that the environment pollution caused by the discharge of the flue gas is prevented;
in addition, the measuring system measures the concentration of NOx in the outlet flue of the combustion engine, and the outlet flue of the combustion engine is directly communicated with the denitration inlet of the denitration device, so that the concentration of NOx in the outlet flue of the combustion engine measured by the measuring system is equivalent to the concentration of NOx in the denitration inlet, and the NOx concentration at the denitration inlet measured in real time is calculated by the ammonia injection total amount control system so as to guide the SCR denitration device to inject ammonia accurately, thereby achieving the purpose of improving the denitration efficiency.
The ammonia injection total amount control system guides the SCR denitration device to perform the ammonia injection operation process, a target value is set at a denitration outlet of the SCR denitration device, NOx concentration measurement is performed at the denitration outlet, a certain difference value exists between a measured NOx concentration value at the denitration outlet and the target value, the ammonia injection total amount control system comprehensively calculates the measured NOx concentration of a flue at an outlet of a combustion engine in combination with parameters such as flue gas flow velocity, operation load and total air volume, the calculated result is used as a feed-forward amount introduced into the ammonia injection total amount control system, operation is performed in combination with the difference value between the measured NOx concentration value and the target value, so that the ammonia injection system is guided to adjust the ammonia injection amount, the measured NOx concentration value at the denitration outlet is enabled to be continuously close to the target value, and the SCR denitration device and the ammonia injection total amount control system belong to the prior art and are only briefly described herein.
2. And each pipeline of the measuring system is made of high-temperature-resistant alloy materials, so that the loss of high-temperature smoke to the pipe can be avoided.
3. The measuring tube is provided with the mixing tube with the diameter larger than that of the measuring tube, so that the zoned sampling smoke can be mixed, and the comprehensive analysis of the zoned sampling smoke is facilitated; and the mixing tube sets up before NOx concentration rapid survey instrument, and the sample flue gas flows through the sampling tube and surveys the buret, arrives and measures again behind the mixing tube, can make the flue gas natural cooling to NOx concentration rapid survey instrument operating temperature within range, then carries out the rapid survey.
4. And the sampling main valve and the flowmeter are used for controlling and metering the sampled smoke data.
5. The plurality of flue gas sampling ports are arranged according to the equal-area method principle, namely, the cross section of the flue is divided into a plurality of virtual partitions with equal areas, the flue gas sampling ports are arranged at the centers of the partitions, each flue gas sampling port samples flue gas in a corresponding partition, each partition of the flue gas is respectively sampled, and then mixed measurement is carried out, so that the flue gas sample data is more accurate.
6. The lower end port of the sampling tube is closed, so that sampling smoke can enter the sampling tube only from the smoke sampling port, and the smoke is prevented from entering the sampling tube from the lower end port to cause interference on smoke samples.
Drawings
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
In order to more clearly illustrate the embodiments of the present invention, the drawings which are needed to be used in the embodiments will be briefly described below, and it is apparent that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained from the drawings without inventive labor to those skilled in the art.
Fig. 1 is a schematic diagram of a system for rapidly measuring a NOx concentration in an outlet flue of a combustion engine for a denitration system according to an embodiment of the present invention.
Description of reference numerals:
1-an outlet flue of a gas turbine; 2-sampling tube; 21-a flue gas sampling port; 3-measuring tube; 4-a return pipe; 5-a rapid NOx concentration measuring instrument; 6-a mixing tube; 7-a main sampling valve; 8-flow meter.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, as presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Some embodiments of the utility model are described in detail below with reference to the accompanying drawings. The embodiments described below and the features of the embodiments can be combined with each other without conflict.
The embodiment provides a system for rapidly measuring the concentration of NOx in a gas turbine outlet flue of a denitration system, and the system comprises a sampling pipe 2, a measuring pipe 3, a return pipe 4 and a rapid NOx concentration measuring instrument 5, wherein the sampling pipe 2 is connected with the measuring pipe 3; the lower end of the sampling tube 2 is vertically inserted into the front end of the outlet flue 1 of the gas turbine; the upper end of the sampling pipe 2 is connected with the front end of the measuring pipe 3, the rear end of the measuring pipe 3 is connected with the upper end of the return pipe 4, and the measuring pipe 3 is positioned outside the outlet flue 1 of the gas turbine; the lower end of the return pipe 4 is vertically inserted into the rear end of the outlet flue 1 of the combustion engine; a plurality of flue gas sampling ports 21 are arranged on the side wall of the part of the sampling tube 2 inserted into the outlet flue 1 of the combustion engine, and the opening direction of the flue gas sampling ports 21 is opposite to the flow direction of flue gas; the NOx concentration rapid measuring instrument 5 is provided on the measuring pipe 3.
Compared with the prior art, in the technical scheme, the sampling tube 2, the measuring tube 3 and the return tube 4 are sequentially connected, the lower end of the sampling tube 2 is vertically inserted into the front end of the outlet flue 1 of the gas turbine, the front end of the measuring tube 3 is connected with the upper end of the sampling tube 2, the rear end of the measuring tube 3 is connected with the upper end of the return tube 4, the flue gas sampling port 21 is arranged on the side wall of the part of the sampling tube 2 inserted into the outlet flue 1 of the gas turbine, the opening direction of the flue gas sampling port 21 is opposite to the flow direction of flue gas, and because of the characteristic of high flue gas flow speed in the outlet flue 1 of the gas turbine, the flue gas extraction power in the device is derived from the self momentum of the flue gas and the front-back pressure difference between the sampling tube 2 and the return tube 3, so that the sampling of the self-return flue gas with the pressure difference is realized; the rapid NOx concentration measuring instrument 5 can realize rapid measurement of NOx concentration; secondly, the arrangement of the plurality of flue gas sampling ports 21 can realize the partitioned sampling of the flue gas, and compared with single-point sampling, the reliability is higher, and the deviation is smaller; the arrangement of the return pipe 4 can enable the flue gas to flow back to the rear end of the outlet flue 1 of the gas turbine after the measurement is finished, and subsequent denitration treatment is carried out, so that the environment pollution caused by the discharge of the flue gas is prevented;
in addition, the measuring system measures the concentration of NOx in the gas turbine outlet flue 1, and the gas turbine outlet flue 1 is directly communicated with the denitration inlet of the denitration device, so that the concentration of NOx in the gas turbine outlet flue 1 measured by the measuring system is equivalent to the concentration of NOx in the denitration inlet, and the measured concentration of NOx in the denitration inlet is calculated by the ammonia injection total amount control system so as to guide the SCR denitration device to inject ammonia accurately, so that the aim of improving the denitration efficiency is fulfilled.
More preferably, the sampling tube 2, the measuring tube 3 and the return tube 4 are made of high-temperature-resistant alloy materials. In the technical scheme, each pipeline of the measuring system is made of high-temperature-resistant alloy materials, so that the loss of high-temperature smoke to the pipe can be avoided.
More preferably, a mixing pipe 6 is provided on the measuring pipe 3, the mixing pipe 6 is provided in front of the NOx concentration rapid measuring instrument 5, and the diameter of the mixing pipe 6 is larger than that of the measuring pipe 3. In the technical scheme, the mixing pipe 6 with the diameter larger than that of the measuring pipe 3 is arranged on the measuring pipe 3, so that the zoned sampling flue gas can be mixed, and the comprehensive analysis of the zoned sampling flue gas is facilitated; and the mixing pipe 6 is arranged in front of the NOx concentration rapid measuring instrument 5, the sampled smoke flows through the sampling pipe 2 and the measuring pipe 3, and then the measurement is carried out after the sampled smoke reaches the mixing pipe 6, so that the smoke can be naturally cooled to the working temperature range of the NOx concentration rapid measuring instrument 5, and then the rapid measurement is carried out.
More preferably, the system further comprises a sampling main valve 7 and a flow meter 8, wherein the sampling main valve 7 and the flow meter 8 are arranged in sequence before the mixing pipe 6. In the technical scheme, the sampling main valve 7 and the flowmeter 8 are arranged and used for controlling and metering sampling smoke data.
More preferably, the plurality of flue gas sampling ports 21 are sequentially arranged on the portion of the sampling pipe 2 located in the outlet flue 1 of the combustion engine from top to bottom according to the principle of equal area of flue cross section. In the technical scheme, the plurality of flue gas sampling ports 21 are arranged according to the equal-area principle, namely, the cross section of the flue is divided into a plurality of virtual partitions with equal areas, the flue gas sampling ports 21 are arranged at the centers of the partitions, the flue gas sampling ports 21 sample the flue gas in the corresponding partitions, the sampling ports sample the flue gas in each partition respectively, and then the mixed measurement is carried out, so that the flue gas sample data is more accurate.
More preferably, the lower end port of the sampling tube 2 is closed. In this technical scheme, the lower extreme port of sampling tube 2 seals and can guarantee that the sample flue gas only gets into sampling tube 2 from flue gas sample connection 21 in, avoids the flue gas to get into from the lower extreme port of sampling tube 2 and causes the interference to the flue gas sample.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the utility model has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (6)
1. The utility model provides a combustion engine outlet flue NOx concentration rapid survey system for deNOx systems which characterized in that: comprises a sampling tube, a measuring tube, a return tube and a NOx concentration rapid measuring instrument;
the lower end of the sampling tube is vertically inserted into the front end of the outlet flue of the gas turbine, and the lower end port of the sampling tube is closed; the upper end of the sampling tube is connected with the front end of the measuring tube, the rear end of the measuring tube is connected with the upper end of the return tube, and the measuring tube is positioned outside the outlet flue of the gas turbine; the lower end of the return pipe is vertically inserted into the rear end of the outlet flue of the combustion engine;
a plurality of flue gas sampling ports are arranged on the side wall of the part of the sampling pipe inserted into the outlet flue of the gas turbine, and the opening direction of the flue gas sampling ports is opposite to the flow direction of flue gas; the rapid NOx concentration measuring instrument is arranged on the measuring pipe.
2. The system for rapidly measuring the concentration of NOx in the outlet flue of the combustion engine for the denitration system according to claim 1, wherein: the sampling tube, the measuring tube and the return tube are all made of high-temperature-resistant alloy materials.
3. The system for rapidly measuring the concentration of NOx in the outlet flue of the combustion engine for the denitration system according to claim 1, wherein: be provided with the hybrid tube on surveying the buret, the hybrid tube set up in before the quick measuring instrument of NOx concentration, just the diameter of hybrid tube is greater than survey the diameter of buret.
4. The system for rapidly measuring the NOx concentration of the outlet flue of the combustion engine for the denitration system as claimed in claim 3, wherein: still include sample main valve and flowmeter, sample main valve with the flowmeter sets gradually in front of the hybrid tube.
5. The system for rapidly measuring the concentration of NOx in an outlet flue of a combustion engine for a denitration system of claim 1, wherein: a plurality of the flue gas sample connection arranges in proper order from top to bottom according to the equal area principle of flue cross-section on the sampling tube be located part in the gas turbine outlet flue.
6. The system for rapidly measuring the concentration of NOx in the outlet flue of the combustion engine for the denitration system according to claim 1, wherein: the lower end port of the sampling tube is closed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123007880.XU CN216955914U (en) | 2021-12-01 | 2021-12-01 | A gas turbine outlet flue NOx concentration rapid survey system for deNOx systems |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123007880.XU CN216955914U (en) | 2021-12-01 | 2021-12-01 | A gas turbine outlet flue NOx concentration rapid survey system for deNOx systems |
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| CN216955914U true CN216955914U (en) | 2022-07-12 |
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| CN202123007880.XU Active CN216955914U (en) | 2021-12-01 | 2021-12-01 | A gas turbine outlet flue NOx concentration rapid survey system for deNOx systems |
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