CN210410203U - Automatic ammonia optimization adjustment system that spouts of SCR denitration - Google Patents

Automatic ammonia optimization adjustment system that spouts of SCR denitration Download PDF

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CN210410203U
CN210410203U CN201920448780.4U CN201920448780U CN210410203U CN 210410203 U CN210410203 U CN 210410203U CN 201920448780 U CN201920448780 U CN 201920448780U CN 210410203 U CN210410203 U CN 210410203U
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唐郭安
唐树芳
朱跃
王丰吉
王建峰
李壮
陈艺秋
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Huadian Electric Power Research Institute Co Ltd
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Abstract

The utility model relates to an automatic ammonia optimization adjustment system that spouts of SCR denitration, the top of first layer catalyst, be provided with a set of measurement pipe network between first layer catalyst and the second layer catalyst, between second layer catalyst and the third layer catalyst and below the third layer catalyst, telescopic thermoscope and telescopic dynamic pressure measuring apparatu, each set of measurement pipe network all includes a measurement house steward, the branch is divided into a plurality of ways of auxiliary pipes in the measurement house steward pierces into denitration flue, it has a plurality of ways of branch pipes to divide equally on each way of auxiliary pipe, the measurement pipe network arranges with the grid method and carries out the multiple spot sampling measurement, realize to each layer catalyst import and export flue gas sampling analysis, obtain each layer temperature, pressure, the velocity of flow, each component gas distribution data, through arrangement and calculation to the data, confirm the ammonia injection volume, automatically adjust each branch pipe ammonia injection volume, the operational aspect of each layer catalyst of every module is taken notes simultaneously, provide basis for the replacement of the catalyst.

Description

Automatic ammonia optimization adjustment system that spouts of SCR denitration
Technical Field
The utility model relates to a coal fired boiler atmospheric pollutants control technical field, specifically say, relate to an automatic ammonia optimization adjustment system that spouts of SCR denitration.
Background
With the increasing severity of the atmospheric pollutants, the emission control of the atmospheric pollutants NOX in thermal power generation enterprises is also more and more strict. In order to achieve the purpose of controlling NOx emission, an SCR denitration technology is introduced. The SCR denitration technology is characterized in that ammonia gas and nitric oxide are sprayed into the SCR denitration technology to carry out chemical reaction under the condition of a catalyst, so that NOX in flue gas can be removed efficiently. But is influenced by factors such as flue gas flow field and component distribution uniformity, catalyst abrasion, catalyst inactivation and the like, so that the denitration efficiency cannot meet the design requirement, and further excessive ammonia spraying or ammonia spraying unevenness is caused, finally, NOX emission cannot be effectively controlled, and meanwhile, ammonium bisulfate can be generated to damage the tail equipment of the flue. In order to avoid the situation, ammonia injection optimization adjustment needs to be performed frequently, but the existing adjustment modes can only ensure denitration efficiency under certain specific working conditions, and have no real-time performance and long-term performance.
Chinese patent with application No. 2015101046986 and granted publication No. CN 104699061B: an on-line detection and ammonia injection optimization control method for an SCR denitration catalyst is characterized in that the existing measuring points of a CEMS system are used for carrying out automatic ammonia injection optimization adjustment, and the performance reduction condition of the catalyst can be judged.
Chinese patent with application No. 2015105145209 and granted publication No. CN 105126616B: an ammonia injection optimization method of an SCR denitration system based on weight valve regulation and control is disclosed in the patent, the ammonia injection optimization method can measure the flow velocity distribution condition of flue gas in operation but cannot measure the concentration distribution condition of NOx, and a manual measurement method is used, so that the operation effect of the SCR system cannot be adjusted in real time.
Chinese patent with application No. 2016102313885 and granted publication No. CN 105854597B: the intelligent optimization and adjustment system and method for the ammonia injection grid of the SCR denitration device can detect the concentration distribution of NH3 and NOX at the inlet of the denitration catalyst and the concentration distribution of NOX at the outlet of the denitration catalyst, obtain the optimal ammonia injection amount through calculation of an intelligent control system, adjust an ammonia injection branch pipe, and finally achieve the purpose of ammonia injection optimization and adjustment conveniently, accurately and quickly.
In view of the above, there is a need for improvement of the existing SCR denitration ammonia injection optimization adjustment system and method.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome the above-mentioned not enough that exists among the prior art, and provide one kind and can arrange characteristics and operation characteristics according to SCR deNOx systems, realize having accuracy, agility, real-time's automatic ammonia injection optimization adjustment system and adjustment method.
The utility model provides a technical scheme that above-mentioned problem adopted is: an automatic ammonia injection optimization and adjustment system for SCR denitration comprises a denitration flue, and a first layer of catalyst, a second layer of catalyst, a third layer of catalyst and an ammonia injection grid which are arranged in the denitration flue, wherein the first layer of catalyst, the second layer of catalyst and the third layer of catalyst are arranged from top to bottom, and the ammonia injection grid is positioned above the first layer of catalyst; the method is characterized in that: a set of measuring pipe network, a telescopic temperature measuring instrument and a telescopic dynamic pressure measuring instrument are arranged above the first layer of catalyst, between the first layer of catalyst and the second layer of catalyst, between the second layer of catalyst and the third layer of catalyst and below the third layer of catalyst, wherein the measuring pipe network arranged above the first layer of catalyst is positioned below the ammonia injection grid; each set of measuring pipe network comprises a measuring main pipe, the measuring main pipe penetrates into the denitration flue and is branched into a plurality of auxiliary pipes, the auxiliary pipes are located in the same horizontal plane and are arranged at equal intervals, each auxiliary pipe is evenly branched with a plurality of branch pipes which are located in the same vertical plane and are arranged at equal intervals from top to bottom in the height direction, the horizontal lengths of the branch pipes branched from each auxiliary pipe are sequentially decreased in an equal difference manner from top to bottom, namely the horizontal length of the branch pipe located at the uppermost position is longest, and the horizontal length of the branch pipe located at the lowermost position is shortest; the end parts of the branch pipes are provided with measuring holes, and each branch pipe is provided with a branch pipe electric valve; the denitration flue is characterized in that a pressure gauge, a flue gas analyzer and an ammonia concentration detector are arranged on the measuring main pipe penetrating out of the denitration flue and connected, and a main pipe electric valve is arranged on the pressure gauge.
Preferably, the measuring main pipe penetrating out of the denitration flue is connected with a compressed air inlet pipeline, and a purging valve is installed on the compressed air inlet pipeline.
Preferably, the telescopic temperature measuring instrument and the telescopic dynamic pressure measuring instrument are both installed through telescopic pipelines; the telescopic pipeline is arranged outside the denitration flue, and one end of the telescopic pipeline is communicated and connected with the denitration flue; the outsides of the telescopic pipelines are provided with steam cooling protection devices; the telescopic pipeline for installing the telescopic temperature measuring instrument and the telescopic pipeline for installing the telescopic dynamic pressure measuring instrument can share one set of steam cooling protection device, and also can respectively use two sets of steam cooling devices.
Preferably, the first layer of catalyst, the second layer of catalyst and the third layer of catalyst have the same structure and are all composed of M rows and N columns of catalyst installation modules; the number of the auxiliary pipes is equal to the number of M lines, the number of the branch pipes branched from each auxiliary pipe is equal to the number of N columns, the total number of the branch pipes in each set of measuring pipe network is equal to the product of the number of M lines and the number of N columns, the branch pipes correspond to the catalyst mounting modules one by one, the measuring pipe network presents a grid method arrangement mode, and the measuring surface of the measuring pipe network can cover the cross section of the whole flue gas flow field; each branch pipe is a sampling point which is dense enough to cover the whole flue section.
Preferably, the first layer of catalyst, the second layer of catalyst and the third layer of catalyst are all composed of five rows and seven columns of catalyst installation modules, namely, each set of measuring pipe network comprises 5 auxiliary pipes and 35 branch pipes.
In order to solve the technical problem, the utility model discloses still provide another technical scheme: an adjusting method of an SCR denitration automatic ammonia injection optimization adjusting system is set as follows: the outlet concentration of nitrogen oxide is 50mg/m under the condition that the outlet concentration of nitrogen oxide is not more than the outlet concentration of nitrogen oxide allowed by the current national standard3Is a limit value; the measurement pipe network above the first layer of catalyst is a first set of measurement pipe network, the measurement pipe network between the first layer of catalyst and the second layer of catalyst is a second set of measurement pipe network, the measurement pipe network between the second layer of catalyst and the third layer of catalyst is a third set of measurement pipe network, and the measurement pipe network below the third layer of catalyst is a fourth set of measurement pipe network.
The adjusting method comprises the following specific steps:
the first step is as follows: branch electric valves arranged on 35 branch pipes in the first set of measurement pipe network are opened in sequence, and the flue gas analyzer, the ammonia concentration detector and the pressure gauge in the set of measurement pipe network are used for measuring the concentration average value NO of the nitrogen oxide inletX inletAverage oxygen concentration value O2 inletAverage carbon dioxide concentration CO2 inletAverage sulfur dioxide concentration SO2 inletAverage ammonia concentration NH3 inletAnd inlet static pressure mean value PInlet portSimultaneously using a telescopic thermometer and a telescopic dynamic pressure measuring instrument which are arranged above the first layer of catalyst to respectively measure the average value T of the inlet temperatureInlet portAnd inlet dynamic pressure △ PInlet portThen calculating according to a formula to obtain the theoretical ammonia injection amount w1；
Theoretical ammonia injection quantity w1The calculation formula of (2) is as follows:
Figure BDA0002017643000000031
wherein: theoretical ammonia injection quantity w1The unit of (A) is kg/h;η DeNOx efficiency%0Is the flue gas volume m under standard state, dry basis and actual oxygen content3/h；NOX inletThe average value of the concentration of nitrogen oxides at the denitration inlet is shown.
η is calculated as:
Figure BDA0002017643000000032
wherein: NOX outletTaking the average value of the concentration of nitrogen oxides at the outlet of the denitration as 50mg/m3。
Q0The calculation formula of (2) is as follows:
Figure BDA0002017643000000033
wherein: qwFor denitration, the flue gas amount m under the standard state, the wet basis and the actual oxygen content of the inlet3/h；TInlet portThe average temperature of the denitration inlet is DEG C; pInlet portIs the average static pressure of the denitration inlet, Pa; b isaAtmospheric pressure, Pa; theta is the moisture content of the flue gas,%.
QwThe calculation formula of (2) is as follows:
Qw＝3600×S×Vi
wherein: s is the measured cross-sectional area, m2；ViTo measure the velocity at point i, m/s.
ViThe calculation formula of (2) is as follows:
Figure BDA0002017643000000041
wherein K is backrest tube coefficient and is 0.84, △ PInlet portTo measure the dynamic pressure at point i, Pa; rho is standard state, wet base smoke density, kg/m3。
The calculation formula of rho is as follows:
Figure BDA0002017643000000042
wherein:O2 inletIs the volume percentage of dry oxygen gas in the flue gas,%;
CO2 inletIs the volume percentage of dry carbon dioxide in the flue gas;
SO2 inletIs the volume percentage of dry sulfur dioxide gas in the flue gas;
Figure BDA0002017643000000043
taking 1.4286kg/m as standard state and wet-based oxygen density3；
Figure BDA0002017643000000044
Taking 1.9643kg/m as standard state and wet carbon dioxide density3；
Figure BDA0002017643000000045
Taking 2.8580kg/m as standard state and wet-based sulfur dioxide density3；
Figure BDA0002017643000000046
Taking 0.8036kg/m as standard state and wet base water vapor density3；
Figure BDA0002017643000000047
Taking 1.2507kg/m as standard state and wet-based nitrogen density3；
The second step is that: sequentially opening branch electric valves arranged on 35 branch pipes in a fourth set of measurement pipe network to measure the average NO of the concentration of the nitrogen oxide outletX outletAverage value of outlet static pressure PAn outletAnd the average value T of the outlet temperatureAn outletThen correcting the theoretical ammonia spraying amount obtained by the first step to obtain the ammonia spraying amount w2；
The third step: when NO is presentX outletLess than 50mg/m3Relative standard deviation DAn outletWhen the ammonia injection amount is less than 10 percent, the ammonia injection optimization adjustment is finished; when D is presentAn outletWhen the concentration of the nitrogen oxide is more than 10 percent, adjusting the concentration of the nitrogen oxideAmmonia spraying grid corresponding to the position with larger deviation until NOX outletLess than 50mg/m3And DAn outletLess than 10%;
the fourth step: the method comprises the following steps of measuring the concentration, temperature and pressure of nitrogen oxides at an inlet and an outlet of each catalyst installation module by utilizing four sets of measurement pipe networks, respectively calculating the denitration efficiency of each module, recording data, analyzing the operation condition of the modules and providing a basis for catalyst replacement;
the fifth step: and (5) opening a purging valve, and self-cleaning the measurement pipe network by using compressed air.
Compared with the prior art, the utility model, have following advantage and effect:
1) the real-time and continuous adjustment of ammonia injection optimization is realized, the adjustment is not limited by load working conditions, the measurement pipe network is arranged in the denitration flue, the parameters such as flue gas components and the like can be measured in real time, and the adjustment of ammonia injection amount is not limited by the load working conditions any more;
2) the intelligent adjustment of ammonia injection optimization is realized, manual operation is greatly reduced, and the manual operation is greatly reduced by automatically processing data and automatically controlling a system;
3) the accurate measurement of smoke components and static pressure is realized, and the measuring surface can cover the whole smoke flow field section; the measuring pipe network is arranged in the flue by a grid method, and the sampling points are dense enough to cover the whole flue section;
4) the monitoring of the running state of each layer of catalyst is realized, the upper part and the lower part of each layer of catalyst are uniformly provided with a measuring pipe network, the inlet and outlet parameters of each layer of catalyst can be sampled in real time and data can be recorded, a database is established for the performance parameters of each catalyst, and data support is provided for the performance analysis and replacement of the catalyst;
5) the telescopic temperature measuring instrument and the telescopic dynamic pressure measuring instrument are used for measuring temperature and dynamic pressure flexibly and quickly, and the telescopic measuring gun is used for measuring the temperature and the dynamic pressure, so that the total amount of measuring probes is reduced on the premise of ensuring enough sampling points, and the abrasion of the instrument in a flue is effectively avoided.
Drawings
Fig. 1 is a schematic front view structure diagram of an embodiment of the present invention.
Fig. 2 is a schematic illustration of the top layout of the second set of pipe networks in the embodiment of the present invention.
Fig. 3 is a distribution structure diagram of 7 branch pipes of a secondary pipe branch in the second set of measurement pipe network in the height direction from the main view.
In the figure:
a first layer of catalyst 1, a second layer of catalyst 2 and a third layer of catalyst 3;
the denitration flue 4, the ammonia injection grid 5, the flue gas analyzer 6, the ammonia concentration detector 7 and the catalyst mounting die 8;
a pressure gauge 21, an electric valve 210, a compressed air inlet pipeline 15 and a purging valve 9;
a measurement main pipe 11 of a first set of measurement pipe network;
a measurement main 12 of a second set of measurement pipe networks;
a third set of measurement manifold 13 of measurement piping network;
a fourth measurement manifold 14 of a measurement pipe network;
5-way secondary pipes 121, 122, 123, 124 and 125 branched from the measurement main pipe 12;
7 branch pipes 1251, 1252, 1253, 1254, 1255, 1256, 1257 branched from the sub-pipe 125;
a manifold electric valve 12571 is mounted on the manifold 1257.
Detailed Description
The present invention will be described in further detail by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not intended to limit the present invention.
Example (b):
see fig. 1-3.
The embodiment is an automatic ammonia optimization adjustment system that spouts of SCR denitration, and this system includes denitration flue 4 and sets up first layer catalyst 1, second floor catalyst 2, third layer catalyst 3 and the ammonia injection grid 5 in denitration flue 4, and first layer catalyst 1, second floor catalyst 2 and third layer catalyst 3 top-down arrange, and ammonia injection grid 5 is located the top of first layer catalyst 1.
In this embodiment, a set of measuring pipe network, a telescopic thermometer 88 and a telescopic dynamic pressure measuring instrument 99 are arranged above the first layer of catalyst 1, between the first layer of catalyst 1 and the second layer of catalyst 2, between the second layer of catalyst 2 and the third layer of catalyst 3 and below the third layer of catalyst 3. Setting: the measurement pipe network above the first layer of catalyst 1 is a first set of measurement pipe network, the measurement pipe network between the first layer of catalyst 1 and the second layer of catalyst 2 is a second set of measurement pipe network, the measurement pipe network between the second layer of catalyst 2 and the third layer of catalyst 3 is a third set of measurement pipe network, and the measurement pipe network below the third layer of catalyst 3 is a fourth set of measurement pipe network. The first set of measuring pipe network is located below the ammonia injection grid 5.
In this embodiment, each set of measurement pipe network has the same structure and includes one measurement main pipe, referring to fig. 1, where 11 in the figure is a measurement main pipe of a first set of measurement pipe network, 12 in the figure is a measurement main pipe of a second set of measurement pipe network, 13 in the figure is a measurement main pipe of a third set of measurement pipe network, and 14 in the figure is a measurement main pipe of a fourth set of measurement pipe network.
Taking a second set of measuring pipe network as an example, the structure of the measuring pipe network is described, referring to fig. 2 and 3, the measuring main pipe 12 penetrates into the denitration flue 4 and is branched into 5 secondary pipes 121, 122, 123, 124 and 125, the 5 secondary pipes are positioned in the same horizontal plane and are arranged at equal intervals, each secondary pipe is equally branched with 7 branch pipes positioned in the same vertical plane and arranged at equal intervals from top to bottom in the height direction, the horizontal lengths of the 7 branch pipes branched on each secondary pipe are sequentially decreased in equal difference from top to bottom, that is, the horizontal length of the branch pipe positioned at the uppermost part is longest, and the horizontal length of the branch pipe positioned at the lowermost part is shortest. For example, fig. 3 is a schematic diagram of a distribution structure of 7 branch pipes branched from the sub pipe 125, where the 7 branch pipes are 1251, 1252, 1253, 1254, 1255, 1256, and 1257 sequentially from top to bottom. The end part of each branch pipe is provided with a measuring hole, and each branch pipe is provided with a branch pipe electric valve; for example, a manifold electric valve 12571 is mounted on the manifold 1257.
The measurement pipe network is designed to be in a grid method arrangement mode, and is matched with a structural mode of three layers of catalysts, in the embodiment, a first layer of catalyst 1, a second layer of catalyst 2 and a third layer of catalyst 3 are in the same structure and are all composed of five-row and seven-column catalyst installation modules 8; the number of the auxiliary pipes is equal to the number of rows, the number of the branch pipes branched from each auxiliary pipe is equal to the number of columns, the product of the total number of the branch pipes of each set of measuring pipe network and the number of the rows and the number of the columns is equal, namely the total number of the branch pipes is 35, and the branch pipes correspond to the catalyst mounting modules 8 one by one, so that the measuring surface of the measuring pipe network can cover the cross section of the whole flue gas flow field; each branch pipe is a sampling point which is dense enough to cover the whole flue section.
In this embodiment, a pressure gauge 21, a flue gas analyzer 6 and an ammonia concentration detector 7 are installed on the measuring header pipe 11 penetrating out of the denitration flue 4, and a header pipe electric valve 210 is installed on the pressure gauge 21. The measuring main pipe penetrating out of the denitration flue 4 is connected with a compressed air inlet pipeline 15, and the compressed air inlet pipeline 15 is provided with a purging valve 9.
In this embodiment, the telescopic temperature measuring instrument 88 and the telescopic dynamic pressure measuring instrument 99 are both installed through telescopic pipes; the telescopic pipeline is arranged outside the denitration flue 4, and one end of the telescopic pipeline is communicated and connected with the denitration flue 4. The outsides of the telescopic pipelines are provided with steam cooling protection devices; the telescopic pipeline for installing the telescopic temperature measuring instrument and the telescopic pipeline for installing the telescopic dynamic pressure measuring instrument can share one set of steam cooling protection device, and also can respectively use two sets of steam cooling devices. As for the specific structure of the telescopic pipe and the structure and installation manner of the telescopic temperature measuring instrument 88 and the telescopic dynamic pressure measuring instrument 99, reference can be made to the prior art.
In this embodiment, the adjusting method of the SCR denitration automatic ammonia injection optimization adjusting system is as follows: setting: the outlet concentration of nitrogen oxide is 50mg/m under the condition that the outlet concentration of nitrogen oxide is not more than the outlet concentration of nitrogen oxide allowed by the current national standard3Is a limit value;
the first step is as follows: the branch electric valves arranged on the 35 branch pipes in the first set of measurement pipe network are opened in sequence, and the flue gas analyzer, the ammonia concentration detector and the pressure gauge in the set of measurement pipe network are used for measuring the concentration of the nitrogen oxide inletMean value of NOX inletAverage oxygen concentration value O2 inletAverage carbon dioxide concentration CO2 inletAverage sulfur dioxide concentration SO2 inletAverage ammonia concentration NH3 inletAnd inlet static pressure mean value PInlet portSimultaneously using a telescopic thermometer and a telescopic dynamic pressure measuring instrument which are arranged above the first layer catalyst 1 to respectively measure the average value T of the inlet temperatureInlet portAnd inlet dynamic pressure △ PInlet portThen calculating according to a formula to obtain the theoretical ammonia injection amount w1；
Theoretical ammonia injection quantity w1The calculation formula of (2) is as follows:
Figure BDA0002017643000000071
wherein: theoretical ammonia injection quantity w1In kg/h, η is denitration efficiency,%, Q0Is the flue gas volume m under standard state, dry basis and actual oxygen content3/h；NOX inletThe average value of the concentration of nitrogen oxides at the denitration inlet is shown.
η is calculated as:
Figure BDA0002017643000000072
wherein: NOX outletTaking the average value of the concentration of nitrogen oxides at the outlet of the denitration as 50mg/m3。
Q0The calculation formula of (2) is as follows:
Figure BDA0002017643000000081
wherein: qwFor denitration, the flue gas amount m under the standard state, the wet basis and the actual oxygen content of the inlet3/h；TInlet portThe average temperature of the denitration inlet is DEG C; pInlet portIs the average static pressure of the denitration inlet, Pa; b isaAtmospheric pressure, Pa; theta is the moisture content of the flue gas,%.
QwThe calculation formula of (2) is as follows:
Qw＝3600×S×Vi
wherein: s is the measured cross-sectional area, m2；ViTo measure the velocity at point i, m/s.
ViThe calculation formula of (2) is as follows:
Figure BDA0002017643000000082
wherein K is backrest tube coefficient and is 0.84, △ PInlet portTo measure the dynamic pressure at point i, Pa; rho is standard state, wet base smoke density, kg/m3。
The calculation formula of rho is as follows:
Figure BDA0002017643000000083
wherein: o is2 inletIs the volume percentage of dry oxygen gas in the flue gas,%;
CO2 inletIs the volume percentage of dry carbon dioxide in the flue gas;
SO2 inletIs the volume percentage of dry sulfur dioxide gas in the flue gas;
Figure BDA0002017643000000084
taking 1.4286kg/m as standard state and wet-based oxygen density3；
Figure BDA0002017643000000085
Taking 1.9643kg/m as standard state and wet carbon dioxide density3；
Figure BDA0002017643000000086
Taking 2.8580kg/m as standard state and wet-based sulfur dioxide density3；
Figure BDA0002017643000000087
Taking 0.8036kg/m as standard state and wet base water vapor density3；
ρN2Taking 1.2507kg/m as standard state and wet-based nitrogen density3；
The second step is that: sequentially opening branch electric valves arranged on 35 branch pipes in a fourth set of measurement pipe network to measure the average NO of the concentration of the nitrogen oxide outletX outletAverage value of outlet static pressure PAn outletAnd the average value T of the outlet temperatureAn outletThen correcting the theoretical ammonia spraying amount obtained by the first step to obtain the ammonia spraying amount w2；
The third step: when NO is presentX outletLess than 50mg/m3Relative standard deviation DAn outletWhen the ammonia injection amount is less than 10 percent, the ammonia injection optimization adjustment is finished; when D is presentAn outletWhen the concentration of the nitrogen oxides is more than 10 percent, adjusting the corresponding ammonia injection grid at the position with larger concentration deviation of the nitrogen oxides until NO is obtainedX outletLess than 50mg/m3And DAn outletLess than 10%;
the fourth step: the method comprises the following steps of measuring the concentration, temperature and pressure of nitrogen oxides at an inlet and an outlet of each catalyst installation module by utilizing four sets of measurement pipe networks, respectively calculating the denitration efficiency of each module, recording data, analyzing the operation condition of the modules and providing a basis for catalyst replacement;
the fifth step: and (4) starting a purging valve 9, and self-cleaning the measurement pipe network by using compressed air.
Although the present invention has been described with reference to the above embodiments, it should not be construed as being limited to the scope of the present invention, and any modifications and alterations made by those skilled in the art without departing from the spirit and scope of the present invention should fall within the scope of the present invention.

Claims (5)

1. An automatic ammonia injection optimization and adjustment system for SCR denitration comprises a denitration flue, and a first layer of catalyst, a second layer of catalyst, a third layer of catalyst and an ammonia injection grid which are arranged in the denitration flue, wherein the first layer of catalyst, the second layer of catalyst and the third layer of catalyst are arranged from top to bottom, and the ammonia injection grid is positioned above the first layer of catalyst;
the method is characterized in that: a set of measuring pipe network, a telescopic temperature measuring instrument and a telescopic dynamic pressure measuring instrument are arranged above the first layer of catalyst, between the first layer of catalyst and the second layer of catalyst, between the second layer of catalyst and the third layer of catalyst and below the third layer of catalyst, wherein the measuring pipe network arranged above the first layer of catalyst is positioned below the ammonia injection grid;
each set of measuring pipe network comprises a measuring main pipe, the measuring main pipe penetrates into the denitration flue and is branched into a plurality of auxiliary pipes, the auxiliary pipes are located in the same horizontal plane and are arranged at equal intervals, each auxiliary pipe is evenly branched with a plurality of branch pipes which are located in the same vertical plane and are arranged at equal intervals from top to bottom in the height direction, the horizontal lengths of the branch pipes branched from each auxiliary pipe are sequentially decreased in an equal difference manner from top to bottom, namely the horizontal length of the branch pipe located at the uppermost position is longest, and the horizontal length of the branch pipe located at the lowermost position is shortest; the end parts of the branch pipes are provided with measuring holes, and each branch pipe is provided with a branch pipe electric valve;
the measuring main pipe is provided with a pressure gauge, a flue gas analyzer and an ammonia concentration detector which are connected, and the pressure gauge is provided with a main pipe electric valve.
2. The SCR denitration automatic ammonia injection optimization adjustment system of claim 1, wherein: the measuring main pipe is connected with a compressed air inlet pipeline, and a purging valve is installed on the compressed air inlet pipeline.
3. The SCR denitration automatic ammonia injection optimization adjustment system of claim 1, wherein: the telescopic temperature measuring instrument and the telescopic dynamic pressure measuring instrument are both installed through telescopic pipelines; the telescopic pipeline is arranged outside the denitration flue, and one end of the telescopic pipeline is communicated and connected with the denitration flue; the outsides of the telescopic pipelines are provided with steam cooling protection devices; the telescopic pipeline for installing the telescopic temperature measuring instrument and the telescopic pipeline for installing the telescopic dynamic pressure measuring instrument can share one set of steam cooling protection device, and also can respectively use two sets of steam cooling devices.
4. The SCR denitration automatic ammonia injection optimization adjustment system of claim 1, wherein: the first layer of catalyst, the second layer of catalyst and the third layer of catalyst have the same structure and are all composed of M rows and N columns of catalyst installation modules; the number of the auxiliary pipes is equal to the number of the M lines, the number of the branch pipes branched from each auxiliary pipe is equal to the number of the N columns, the total number of the branch pipes in each set of measuring pipe network is equal to the product of the number of the M lines and the number of the N columns, and the branch pipes correspond to the catalyst mounting modules one by one.
5. The SCR denitration automatic ammonia injection optimization adjustment system of claim 4, wherein: the first layer of catalyst, the second layer of catalyst and the third layer of catalyst are all composed of catalyst installation modules in five rows and seven columns, namely each set of measuring pipe network comprises 5 auxiliary pipes and 35 branch pipes.
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110090552A (en) * 2019-04-04 2019-08-06 华电电力科学研究院有限公司 A kind of SCR denitration sprays ammonia automatically and optimizes and revises system and its method of adjustment
CN112379035A (en) * 2020-10-28 2021-02-19 山东电力研究院 System and method for evaluating performance of catalyst of SCR (selective catalytic reduction) denitration device on line

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110090552A (en) * 2019-04-04 2019-08-06 华电电力科学研究院有限公司 A kind of SCR denitration sprays ammonia automatically and optimizes and revises system and its method of adjustment
CN110090552B (en) * 2019-04-04 2024-01-23 华电电力科学研究院有限公司 SCR denitration automatic ammonia injection optimization adjustment system and adjustment method thereof
CN112379035A (en) * 2020-10-28 2021-02-19 山东电力研究院 System and method for evaluating performance of catalyst of SCR (selective catalytic reduction) denitration device on line
CN112379035B (en) * 2020-10-28 2022-11-01 国网山东省电力公司电力科学研究院 System and method for evaluating performance of SCR (selective catalytic reduction) denitration device catalyst on line

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