WO2021129174A1 - 一种利用气体测量、控制系统及在脱硝烟气检测中的应用 - Google Patents

一种利用气体测量、控制系统及在脱硝烟气检测中的应用 Download PDF

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WO2021129174A1
WO2021129174A1 PCT/CN2020/126420 CN2020126420W WO2021129174A1 WO 2021129174 A1 WO2021129174 A1 WO 2021129174A1 CN 2020126420 W CN2020126420 W CN 2020126420W WO 2021129174 A1 WO2021129174 A1 WO 2021129174A1
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measurement
sampling
gas
patrol
sample gas
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PCT/CN2020/126420
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French (fr)
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钟洪玲
罗志刚
陈鸥
刘国栋
金鑫
沈鹏
徐浩
张浩亮
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北京国电龙源环保工程有限公司
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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
    • G01N33/0073—Control unit therefor
    • 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
    • G01N33/0011—Sample conditioning
    • 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
    • G01N33/0011—Sample conditioning
    • G01N33/0016—Sample conditioning by regulating a physical variable, e.g. pressure, temperature
    • 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
    • G01N33/0011—Sample conditioning
    • G01N33/0018—Sample conditioning by diluting a gas

Definitions

  • the invention relates to the technical field of denitrification and environmental protection, in particular to a gas measurement and control system and its application in denitration flue gas detection.
  • Thermal power plants have been implementing denitrification and environmental protection for more than 10 years.
  • denitrification efficiency due to the uneven distribution of NO X concentration field at the inlet and outlet of the denitration system, the single point sampling method of NO X at the outlet of the denitration SCR cannot extract representative samples. , It cannot reflect the NO X concentration value of the entire section, and the representativeness is poor.
  • the uneven distribution of pollutant concentration cannot be monitored, which causes the problem of excessive ammonia injection for denitrification, which leads to the shortening of the life of the denitrification catalyst and air preheating caused by excessive ammonia injection in some power plants.
  • a series of problems such as the increase of the resistance of the generator, the hypertrophy of the pole line of the electrostatic precipitator, the increase of the power consumption of the induced/supply fan, the failure of the desulphurization slurry, the difficulty of lifting the load of the unit.
  • the present invention provides a gas measurement control system and its application in denitration flue gas detection.
  • the gas measurement control system of the present invention includes: 1-sampling probe, 2-sampling distribution unit (21-distribution interface, 22-mixing device, 23-zoned inspection group), 3-analysis unit (31-mixed measurement analyzer, 32-patrol analyzer); 4-control center (41 controller, 42-big data-artificial intelligence control module).
  • the sampling probes are respectively set in each section of the gas channel outlet section, and the sample gas of each section reaches the interface of the sampling distribution unit through the sampling probe in a continuous equal amount and at the same time; the sampling distribution unit distributes the sample gas of each section into two channels, and accesses one channel.
  • the partition inspection sampling group is connected to the mixing device all the way; the mixed sample gas is fully mixed by the mixing device and then continuously enters the mixed measurement analyzer.
  • the partition sample gas enters the inspection analyzer in sequence through the inspection sampling group according to the inspection rule, and passes Adjust specific parameters such as pipeline length, mixed sample gas flow, and patrol sample gas flow to ensure the synchronization of zone patrol and mixed measurement;
  • the control center includes a controller and a big data-artificial intelligence control module, including sampling probes and sampling The distribution unit, analysis unit, etc. are controlled and connected to the controller, and the big data-artificial intelligence control module uses the mixed measurement value as the "synchronization reference value" to evaluate the patrol value of each partition, complete the partition optimization control, and complete the control target with the mixed measurement value Total optimization control.
  • the gas measurement and control system also includes a multi-rod dilution probe with a fast bypass device, which can shorten the transmission time of the sample gas from the channel section to the probe end from 120 seconds to 15 seconds.
  • the length of the sample gas transmission pipeline from the sampling probe of each zone to the interface of the sampling distribution unit is the same, and the amount of sample gas flowing through the sampling probe of each zone is the same, ensuring that the sample gas of each zone can be transmitted to the interface of the distribution unit continuously, equally, and simultaneously.
  • the sampling distribution unit distributes the sample gas of each partition into two channels, one way is connected to the partition patrol sampling group, and the sample gas of each partition enters the patrol analyzer according to the patrol rules in equal time sharing, and the single partition patrol cycle ⁇ 50 seconds; One way is connected to the mixing device, and the sample gas of each zone continuously enters the mixing device in equal amounts, and then enters the mixing analyzer after being fully mixed.
  • the transmission time of the sample gas through the mixing device is less than 5 seconds.
  • the control center contains a controller and a big data-artificial intelligence control module.
  • the sampling probe, sampling distribution unit, analysis unit, etc. are connected to the controller, and the big data-artificial intelligence control module uses the mixed measurement value as the "synchronization reference value" for evaluation
  • the patrol measurement value of each district completes the district optimization control, and uses the mixed measurement value as the control target to complete the total optimization control.
  • the gas measurement control system of the present invention has the following outstanding technical effects:
  • the gas measurement and control system provided by the present invention realizes "continuous uniform mixing sampling", which is used in denitration flue gas detection to reduce the deviation of NO X data between the denitration outlet and the total outlet from +15mg/Nm 3 to ⁇ 5mg Within /Nm 3 , the data is more representative than the single-point measurement of the independent survey technology.
  • the gas measurement and control system provided by the present invention realizes "continuous uniform mixing sampling", and uses the mixed measured NO X value at the denitration outlet as the target value for total amount control, which is the same as the total exhaust NO X value used in the separate inspection technology Compared with adjusting the control strategy of ammonia injection, the control response time is 3 minutes earlier, 9:59:32 denitration outlet mixed NO X measurement peak, 10:02:29 total exhaust NO X measurement peak.
  • the gas measurement and control system provided by the present invention realizes the "synchronized sampling measurement of zoned patrol and continuous mixed measurement", and the mixed measurement value is used as the "synchronized reference value” to evaluate the deviation of the patrol value of each zone in real time, and is used for zone optimization control
  • the cross-sectional average value is calculated according to each partition value, and the adjustment of the deviation of the inspection value of each partition is evaluated. It can grasp the NO X concentration distribution characteristics of the denitrification outlet in time and adjust the efficiency of the partitions. Higher, better regulation effect. Taking 40mg/Nm 3 as the emission benchmark value, the unequal rate of zone deviation can be well controlled within 20%.
  • the gas measurement and control system provided by the present invention realizes the "synchronized sampling measurement of the partitioned patrol and continuous mixed measurement", and the partitioned mixed measurement value is used as the "synchronized reference value" to evaluate the deviation of the patrol measured value of each partition in real time, and is used for partition optimization Control, the unequal rate of the partition deviation can be controlled within 20%. Compared with only the mixed measurement technology, the problem of excessive local ammonia injection is avoided, and the harm of ammonia escape is reduced. According to the online operation data, after the denitration of a power plant #1 adopts the technology of "zoned inspection and continuous mixed measurement and simultaneous sampling measurement", the real-time ammonia injection rate is lower than that of the original single point measurement (no zone inspection, no mixed measurement) technology. About 17.3%, which is about 12.2% lower than that of only continuous mixed measurement technology.
  • the gas measurement and control system provided by the present invention realizes that the sample gas of each subarea reaches the interface of the sampling distribution unit continuously and sequentially through the sampling probe, which greatly shortens the sample gas replacement and sample gas transmission time of the subarea sampling tube , Improve the inspection efficiency, on the basis of ensuring the analyzer T90 response standard, the single-zone inspection cycle ⁇ 50 seconds.
  • the big data-artificial intelligence control module takes the mixed measurement value as the control target to complete the total optimization control, and the control effect is as follows: based on the big data-artificial intelligence total control after the input of the synchronous sampling measurement technology of the partition patrol and continuous mixed measurement When the working conditions are changed, the ammonia injection adjustment of the denitration system is stable, the NO X emission fluctuation of the total exhaust outlet is reduced from ⁇ 15mg/Nm 3 to within ⁇ 5mg/Nm 3 , and the convergence effect is obvious.
  • Fig. 1 is a schematic diagram of a gas measurement control system according to a specific embodiment of the present invention.
  • the sampling probe 1-, 2- sampling dispensing means dispense interface 21, 22 mixing apparatus, 23- partition patrol group, 3-analyzing unit, 31- mixed measuring analyzer, 32- patrol analyzer, 4-control center, 41 controller, 42-big data-artificial intelligence control module;
  • Figure 2 is a diagram showing the deviation of the NOX data between the SCR outlet and the total outlet of the single-point measurement of the individual inspection technology
  • Figure 3 is a diagram showing the deviation of NOX data between the SCR outlet and the total outlet of the continuous uniform mixing sampling
  • Figure 4 is a sequence diagram of NOX values at the outlet of SCR and the total outlet of continuous uniform mixing sampling
  • Figure 5 is a diagram showing the total control effect of single-point sampling measurement
  • Figure 6 is based on the synchronous sampling and measurement of big data-total amount control effect diagram of zone survey and continuous mixed measurement
  • Figure 7 is a comparison chart of ammonia consumption reduction of various sampling and measurement techniques.
  • a gas measurement control system includes: 1-sampling probe, 2-sampling distribution unit (21-distribution interface, 22-mixing device, 23-zoning inspection group), 3-analysis unit (31 -Mixed measurement analyzer, 32-patrol measurement analyzer); 4-control center (41 controller, 42-big data-artificial intelligence control module).
  • the present invention sets multiple sampling zones at the denitration outlet, such as zone A1, zone A2,..., zone A5, zone B1, zone B2,..., zone B5 as shown in Figure 1, and according to the flue area, each Set 1 to 3 pollutant sampling points in different zones to form a matrix sampling.
  • the sample gas of each partition reaches the interface of the sampling distribution unit continuously and sequentially through the sampling probe; the sampling distribution unit distributes the sample gas of each partition into two paths, one is connected to the partition patrol sampling group, and the other is connected to the mixing device; mixed sample gas After being fully mixed by the mixing device, the sample gas of each partition enters the patrol analyzer in sequence through the patrol sampling group according to the patrol rules, and adjusts the pipeline length, the flow of the mixed sample gas, and the patrol sample gas flow.
  • the control center contains the controller and the big data-artificial intelligence control module, among which the sampling probe, sampling distribution unit, analysis unit and other control access controllers, big data-
  • the artificial intelligence control module uses the mixed measurement value as the "synchronization reference value" to evaluate the patrol measurement value of each partition, complete the partition optimization control, and complete the total optimization control with the mixed measurement value as the control target.
  • data transmission between the controller and the big data-artificial intelligence control module adopts a bus communication mode.
  • the gas measurement and control system is used in the denitrification flue gas detection to reduce the NOX data deviation between the denitrification outlet and the total outlet from +15mg/Nm3 to within ⁇ 5mg/Nm3.
  • the data is representative Stronger performance, as shown in Figure 2-3 and Table 1-3.
  • the mixed measured NOX value at the denitration outlet is used as the target value for total volume control.
  • the control response time is 3 minutes ahead of time, 9:59:32 for denitration
  • the measured peak value of mixed NOX at the outlet and the measured peak value of NOX at the total outlet at 10:02:29 are shown in Figure 4 and Table 1-3.
  • the cross-sectional average is calculated according to the values of each partition, and the adjustment of the deviation of the inspection value of each partition is evaluated. It can grasp the NOX concentration distribution characteristics of the denitrification outlet in time, and the partition adjustment efficiency is higher.
  • the adjustment effect is better, with 40mg/Nm3 as the emission benchmark value, the variability of the zone deviation can be well controlled within 20%.
  • the zone mixed measurement value is used as the "synchronization reference value” to evaluate the deviation of each zone's survey value in real time, which is used for zone optimization control, and the zone deviation unequal rate can be controlled at 20% Within, compared with only the mixed measurement technology, it avoids the problem of excessive local ammonia injection and reduces the harm of ammonia escape.
  • the real-time ammonia injection volume is lower than the original single point measurement (no zone inspection, no mixed measurement) technology. About 17.3%, which is about 12.2% lower than that of only continuous mixed measurement technology.
  • the sample gas of each zone reaches the interface of the sampling distribution unit continuously and sequentially through the sampling probe, which greatly shortens the sample gas replacement and sample gas transmission time of the zone sampling tube, improves the inspection efficiency, and ensures the response of the analyzer T90 Based on the standard, the single-zone survey cycle ⁇ 50 seconds.
  • the big data-artificial intelligence control module uses the mixed measurement value as the control target to complete the total optimization control.
  • Table 1 The distribution data table of NO X concentration field at the denitration outlet of "Simultaneous sampling and measurement of regional patrol and continuous mixed measurement"
  • Table 3 The percentage of time in the fluctuation interval of NOX concentration at the total outlet based on the synchronous sampling measurement technology of the partitioned patrol and continuous mixed measurement

Abstract

一种气体测量控制系统，包括：取样探头（1）、取样分配单元（2）、分析单元（3）、控制中心（4）。其中，取样探头（1）分别设置在气体通道出口的截面各分区，各分区样气经取样探头（1）连续等量、同时序到达取样分配单元（2）的分配接口（21）；取样分配单元（2）将各分区样气分配为两路，一路接入分区巡测取样组（23），一路接入混合装置（22）；混合样气经混合装置（22）充分混合后连续进入混测分析仪（31），各分区样气经分区巡测取样组（23）按巡测规则按序进入巡测分析仪（32），通过调整管路长度、混合样气流量、巡测样气流量等具体参数，保证分区巡测与混合测量的同步性；控制中心（4）包含控制器（41）和大数据-人工智能控制模块（42），其中，取样探头（1）、取样分配单元（2）、分析单元（3）的控制接入控制器（41），大数据-人工智能控制模块（42）将混合测量值作为"同步基准值"评估各分区巡测值，完成分区优化控制，并以混合测量值为控制目标完成总量优化控制。

Description

一种利用气体测量、控制系统及在脱硝烟气检测中的应用 技术领域
本发明是关于脱硝环保技术领域，特别是关于一种利用气体测量、控制系统及在脱硝烟气检测中的应用。
背景技术
火电厂实施脱硝环保已10余年，随着脱硝效率的进一步提高，受脱硝系统SCR入口、出口NO X浓度场分布不均匀影响，脱硝SCR出口NO X单点取样方式无法抽取到代表性的样气，不能反应整个断面NO X浓度值，代表性差，同时无法监测到污染物浓度分布不均匀的变化，从而引起脱硝喷氨过量的问题，导致一些电厂因喷氨过量引起脱硝催化剂寿命缩短、空预器阻力升高、电除尘器极线肥大、引/送风机电耗增加、脱硫浆液失效、机组提升负荷困难等一系列问题。
目前亟需能连续监测脱硝SCR出口截面均匀混合烟气，又能同步智能巡测SCR出口分区的取样测量技术，结合喷氨总量优化、分区巡测优化大数据-人工智能控制技术来提高喷氨及时响应性、精准性，以解决电厂最为关心的脱硝SCR出口NO X浓度场不均匀、单点测量代表性差、控制调节滞后、自动投入品质差等问题。
发明内容
为了克服上述现有技术中存在的问题，本发明提供了一种气体测量控制系统及其在脱硝烟气检测中的应用。
本发明的气体测量控制系统包括：1-取样探头、2-取样分配单元(21-分配接口、22-混合装置、23-分区巡测组)、3-分析单元(31-混测分析仪、32-巡测分析仪)；4-控制中心(41控制器、42-大数据-人 工智能控制模块)。其中，取样探头分别设置在气体通道出口的截面各分区，各分区样气经取样探头连续等量、同时序到达取样分配单元接口；取样分配单元将各分区样气分配为两路，一路接入分区巡测取样组，一路接入混合装置；混合样气经混合装置充分混合后连续进入混测分析仪，各分区样气经巡测取样组按巡测规则按序进入巡测分析仪，通过调整管路长度、混合样气流量、巡测样气流量等具体参数，保证分区巡测与混合测量的同步性；控制中心包含控制器和大数据-人工智能控制模块，其中，取样探头、取样分配单元、分析单元等控制接入控制器，大数据-人工智能控制模块将混合测量值作为“同步基准值”评估各分区巡测值，完成分区优化控制，并以混合测量值为控制目标完成总量优化控制。
其中，气体测量、控制系统还包括带有快速旁路装置的多杆式稀释探头，可使样气从通道截面至探头端的传输时间由120秒缩短至15秒。各分区取样探头至取样分配单元接口处的样气传输管线长度一致，流经各分区取样探头的样气量一致，保证各分区样气能连续、等量、同时序的传输至配单元接口。
取样分配单元将每个分区样气分配为两路，一路接入分区巡测取样组，各分区样气按巡测规则等量分时进入巡测分析仪，单分区巡测周期≯50秒；一路接入混合装置，各分区样气连续等量进入混合装置，充分混合后进入混测分析仪，样气经混合装置的传输时间<5秒。
根据混合样气量、分区巡测样气量计算确定取样分配单元接口至混测分析仪、巡测分析仪之间的管路长度，保证进入混测分析仪、巡测分析仪为同一时刻下烟道样气，保证“分区巡测”与“均匀混合”两种取样测量的同步性。
控制中心包含控制器和大数据-人工智能控制模块，其中，取样探头、取样分配单元、分析单元等控制接入控制器，大数据-人工智 能控制模块将混合测量值作为“同步基准值”评估各分区巡测值，完成分区优化控制，并以混合测量值为控制目标完成总量优化控制。
与现有技术相比，本发明的气体测量控制系统具有如下突出的技术效果：
(1)本发明提供的气体测量、控制系统，实现“连续均匀混合取样”，用于脱硝烟气检测中，使脱硝出口与总排口NO X数据偏差由+15mg/Nm 3缩小到±5mg/Nm 3以内，同单独巡测技术单点测量相比，数据代表性更强。
(2)本发明提供的气体测量、控制系统，实现“连续均匀混合取样”，将脱硝出口混合测量NO X值作为目标值用于总量控制，同单独巡测技术用总排口NO X值调整喷氨的控制策略相比，控制响应时间提前了3分钟，9:59:32脱硝出口混合NO X测量峰值，10:02:29总排口NO X测量峰值。
(3)本发明提供的气体测量、控制系统，实现“分区巡测与连续混测同步取样测量”，混合测量值作为“同步基准值”实时评估各分区巡测值偏差，用于分区优化控制，同单独巡测技术，在所有分区巡测后，再根据各分区值计算截面平均值，评估各分区巡测值偏差的调整相比，能及时掌握脱硝出口NO X浓度分布特征，分区调整效率更高，调节效果更好，以40mg/Nm 3为排放基准值，分区偏差不等率可以很好控制在20％以内。
(4)本发明提供的气体测量、控制系统，实现“分区巡测与连续混测同步取样测量”，分区混合测量值作为“同步基准值”实时评估各分区巡测值偏差，用于分区优化控制，将分区偏差不等率可以控制在20％以内，同只有混测技术相比较，避免了局部喷氨过量问题，减少了氨逃逸的危害。根据在线运行数据，某电厂#1机脱硝采用“分区巡测与连续混测同步取样测量”技术后，实时喷氨量比原单点测量 (无分区巡测、无混测)技术氨耗量降低约17.3％，比仅连续混测技术氨耗量降低约12.2％。
(5)本发明提供的气体测量、控制系统，实现各分区样气经取样探头连续等量、同时序到达取样分配单元接口，极大的缩短了分区取样管的样气置换和样气传输时间，提高了巡测效率，在保证分析仪T90响应标准基础上，单分区巡测周期≯50秒。
(6)大数据-人工智能控制模块以混合测量值为控制目标完成总量优化控制，控制效果如下：基于分区巡测与连续混测同步取样测量技术的大数据-人工智能总量控制投入后，变工况时，脱硝系统喷氨调节稳定，总排口NO X排放波动由±15mg/Nm 3降低至±5mg/Nm 3以内，收敛效果明显。
附图说明
图1是根据本发明具体实施方式的气体测量控制系统示意图。 其 中：1-取样探头、2-取样分配单元、21-分配接口、22-混合装置、23-分区巡测组、3-分析单元、31-混测分析仪、32-巡测分析仪、4-控制中心、41控制器、42-大数据-人工智能控制模块；
图2是单独巡测技术单点测量SCR出口与总排口NOX数据偏差图；
图3是连续均匀混合取样SCR出口与总排口NOX数据偏差图；
图4是连续均匀混合取样SCR出口、总排口NOX值时序图；
图5是单点取样测量总量控制效果图；
图6是基于分区巡测与连续混测同步取样测量大数据-总量控制效果图；
图7是各种取样测量技术氨耗降低对比图。
具体实施方式
下面结合附图，对本发明的具体实施方式进行详细描述，但应当理解本发明的保护范围并不受具体实施方式的限制。
除非另有其它明确表示，否则在整个说明书和权利要求书中，术语“包括”或其变换如“包含”或“包括有”等等将被理解为包括所陈述的元件或组成部分，而并未排除其它元件或其它组成部分。
如图1所示，一种气体测量控制系统，包括：1-取样探头、2-取样分配单元(21-分配接口、22-混合装置、23-分区巡测组)、3-分析单元(31-混测分析仪、32-巡测分析仪)；4-控制中心(41控制器、42-大数据-人工智能控制模块)。
本发明在脱硝出口设置多个取样分区，如图1中所示的分区A1、分区A2、……、分区A5，分区B1、分区B2、……、分区B5，并根据烟道面积，每个分区设置1～3个污染物取样点，形成矩阵式取样。各分区样气经取样探头连续等量、同时序到达取样分配单元接口；取样分配单元将各分区样气分配为两路，一路接入分区巡测取样组，一路接入混合装置；混合样气经混合装置充分混合后连续进入混测分析仪，各分区样气经巡测取样组按巡测规则按序进入巡测分析仪，通过调整管路长度、混合样气流量、巡测样气流量等具体参数，保证分区巡测与混合测量的同步性；控制中心包含控制器和大数据-人工智能控制模块，其中，取样探头、取样分配单元、分析单元等控制接入控制器，大数据-人工智能控制模块将混合测量值作为“同步基准值”评估各分区巡测值，完成分区优化控制，并以混合测量值为控制目标完成总量优化控制。在本发明的一实施方式中，控制器与大数据-人工智能控制模块之间数据传输采用总线通讯方式。
将气体测量、控制系统用于脱硝烟气检测中，使脱硝出口与总排口NOX数据偏差由+15mg/Nm3缩小到±5mg/Nm3以内，同单独巡测技术单点测量相比，数据代表性更强，如图2-3和表1-3所示。将脱硝出口混合测量NOX值作为目标值用于总量控制，同单独巡测技术用总排口NOX值调整喷氨的控制策略相比，控制响应时间提前了3分钟，9:59:32脱硝出口混合NOX测量峰值，10:02:29总排口NOX测量峰值，如图4和表1-3所示。与单独巡测技术，在所有分区巡测后，再根据各分区值计算截面平均值，评估各分区巡测值偏差的调整相比，能及时掌握脱硝出口NOX浓度分布特征，分区调整效率更高，调节效果更好，以40mg/Nm3为排放基准值，分区偏差不等率可以很好控制在20％以内。实现“分区巡测与连续混测同步取样测量”，分区混合测量值作为“同步基准值”实时评估各分区巡测值偏差，用于分区优化控制，将分区偏差不等率可以控制在20％以内，同只有混测技术相比较，避免了局部喷氨过量问题，减少了氨逃逸的危害。根据在线运行数据，某电厂#1机脱硝采用“分区巡测与连续混测同步取样测量”技术后，实时喷氨量比原单点测量(无分区巡测、无混测)技术氨耗量降低约17.3％，比仅连续混测技术氨耗量降低约12.2％。实现各分区样气经取样探头连续等量、同时序到达取样分配单元接口，极大的缩短了分区取样管的样气置换和样气传输时间，提高了巡测效率，在保证分析仪T90响应标准基础上，单分区巡测周期≯50秒。大数据-人工智能控制模块以混合测量值为控制目标完成总量优化控制，变工况时，脱硝系统喷氨调节稳定，总排口NOX排放波动由±15mg/Nm3降低至±5mg/Nm3以内，收敛效果明显，如图5-7和表1-3所示。
表1“分区巡测与连续混测同步取样测量”脱硝出口NO X浓度场分布数据表
Figure PCTCN2020126420-appb-000001
Figure PCTCN2020126420-appb-000002
表2“分区巡测与连续混测同步取样测量”脱硝出口NO X浓度场分布数据表
Figure PCTCN2020126420-appb-000003
表3基于分区巡测与连续混测同步取样测量技术总排口NOX浓度波动区间时间百分比
Figure PCTCN2020126420-appb-000004

Claims (7)

  1. 一种气体测量控制系统，其特征在于：包括：取样探头(1)、取样分配单元(2)、分析单元(3)；控制中心(4)；其中，取样探头分别设置在气体通道出口的截面各分区，各分区样气经取样探头连续等量、同时序到达取样分析单元接口；取样分配单元将各分区样气分配为两路，一路接入分区巡测取样组，一路接入混合装置；混合样气经混合装置充分混合后连续进入混测分析仪，各分区样气经巡测取样组按巡测规则按序进入巡测分析仪；控制中心将混合测量值作为“同步基准值”评估各分区巡测值，完成分区优化控制，并以混合测量值为控制目标完成总量优化控制。
  2. 如权利要求1或2所述的气体测量控制系统，取样分配单元(2)包括分配接口(21)、混合装置(22)和分区巡测组(23)，分析单元(3)包括混测分析仪(31)和巡测分析仪(32)，控制中心(4)包括控制器(41)、大数据-人工智能控制模块(42)，其中，取样探头、取样分配单元接入控制器。
  3. 如权利要求1或2所述的气体测量控制系统，其特征在于：所述取样探头为带有快速旁路装置的多杆式稀释探头，使样气从通道截面至探头端的传输时间由120秒缩短至15秒。
  4. 如权利要求1或2所述的气体测量控制系统，其特征在于：各分区取样探头至取样分配单元接口处的样气传输管线长度一致，流经各分区取样探头的样气量一致，保证各分区样气能连续、等量、同时序的传输至配单元接口。
  5. 如权利要求1或2所述的气体测量控制系统，其特征在于：取样分配单元将每个分区样气分配为两路，一路接入分区巡测取样组，各分区样气按巡测规则等量分时进入巡测分析仪，单分区巡测周期≯40秒；一路接入混合装置，各分区样气连续等量进入混合装置，充分混合后进入混测分析仪，样气经混合装置的传输时间<5秒。
  6. 如权利要求1或2所述的气体测量控制系统，其特征在于：根据混合样气量、分区巡测样气量计算确定取样分配单元接口至混测分析仪、巡测分析仪之间的管路长度，保证进入混测分析仪、巡测分析仪为同一时刻下烟道样气，保证“分区巡测”与“均匀混合”两种取样测量的同步性。
  7. 权利要求1或2所述的气体测量控制系统，其特征在于：控制器与大数据-人工智能控制模块之间数据传输采用总线通讯方式。
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