CN111426649B - Boiler furnace near water-cooled wall reducing atmosphere testing and combustion optimizing adjusting system - Google Patents
Boiler furnace near water-cooled wall reducing atmosphere testing and combustion optimizing adjusting system Download PDFInfo
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- 238000012360 testing method Methods 0.000 title claims abstract description 51
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 36
- 238000005070 sampling Methods 0.000 claims abstract description 118
- 239000003546 flue gas Substances 0.000 claims abstract description 87
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 85
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 51
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 45
- 239000001301 oxygen Substances 0.000 claims abstract description 45
- 239000003245 coal Substances 0.000 claims abstract description 31
- 238000005259 measurement Methods 0.000 claims abstract description 31
- 238000005457 optimization Methods 0.000 claims abstract description 22
- 238000010926 purge Methods 0.000 claims description 28
- 239000000779 smoke Substances 0.000 claims description 25
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 23
- 238000000034 method Methods 0.000 claims description 13
- 238000007664 blowing Methods 0.000 claims description 10
- 229910002091 carbon monoxide Inorganic materials 0.000 claims description 8
- 239000007789 gas Substances 0.000 claims description 8
- 238000001514 detection method Methods 0.000 claims description 7
- 238000002848 electrochemical method Methods 0.000 claims description 7
- 230000003111 delayed effect Effects 0.000 claims description 4
- 239000002912 waste gas Substances 0.000 claims description 4
- 230000000750 progressive effect Effects 0.000 claims description 3
- 229910002089 NOx Inorganic materials 0.000 claims 4
- 238000012544 monitoring process Methods 0.000 abstract description 6
- 238000007689 inspection Methods 0.000 abstract description 4
- 238000012423 maintenance Methods 0.000 abstract description 4
- 230000001105 regulatory effect Effects 0.000 abstract description 3
- 238000001816 cooling Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 229910052717 sulfur Inorganic materials 0.000 description 5
- 230000007797 corrosion Effects 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 238000010408 sweeping Methods 0.000 description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- 230000001680 brushing effect Effects 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
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- 240000004282 Grewia occidentalis Species 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
- G01N21/3504—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for analysing gases, e.g. multi-gas analysis
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N5/00—Systems for controlling combustion
- F23N5/003—Systems for controlling combustion using detectors sensitive to combustion gas properties
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N5/00—Systems for controlling combustion
- F23N5/20—Systems for controlling combustion with a time programme acting through electrical means, e.g. using time-delay relays
- F23N5/206—Systems for controlling combustion with a time programme acting through electrical means, e.g. using time-delay relays using electrical or electromechanical means
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/33—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using ultraviolet light
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
- G01N27/27—Association of two or more measuring systems or cells, each measuring a different parameter, where the measurement results may be either used independently, the systems or cells being physically associated, or combined to produce a value for a further parameter
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D27/00—Simultaneous control of variables covered by two or more of main groups G05D1/00 - G05D25/00
- G05D27/02—Simultaneous control of variables covered by two or more of main groups G05D1/00 - G05D25/00 characterised by the use of electric means
-
- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Abstract
The invention provides a system for testing reducing atmosphere of a boiler furnace near water-cooled wall and adjusting combustion tour optimization, which comprises: flue gas sampling point, patrol survey unit, afterbody flue gas sampling analytic system, sampling control unit and patrol excellent regulation and control unit, patrol excellent regulation and control unit includes: oxygen control module, coal pulverizer play control module, primary air pressure control module and secondary air door control module are according to after regulating and control the adjustment parameter is regulated and control operation oxygen volume control, mill group coal feeding volume rational arrangement, primary air pressure control and secondary air door and the air of over fire respectively. Has the advantages that: the inspection unit is adopted, and only one reducing flue gas analyzer is used, so that the number of the test sample points is ensured, the real-time monitoring of the reducing atmosphere measurement data can be realized, and the investment and maintenance cost is reduced; the optimization treatment of the control unit realizes the optimization adjustment of the secondary air door, the running oxygen amount, the running primary air pressure and the output configuration of the coal mill, and reduces the reducing atmosphere of the furnace near water-cooled wall.
Description
Technical Field
The invention belongs to the technical field of thermal power unit safety, and particularly relates to a system for testing reducing atmosphere of a boiler furnace near water-cooled wall and adjusting combustion optimization.
Background
The high-temperature corrosion of the water wall refers to the phenomenon that sulfur in the fuel generates a corrosive ash layer or slag layer and a corrosive atmosphere in the combustion process, so that the surface of the water wall tube is corroded. Many scholars have studied the judgment basis of high-temperature corrosion, and the judgment standard is generally considered to be mainly the sulfur content of coal and CO and H in flue gas ２ S and O 2 Volume fraction of (a).
Therefore, in order to research the influence of the change of the related parameters of the boiler on the reducing atmosphere of the water wall area, a test hand is requiredExtracting flue gas from the adherence position of the water-cooled wall of the hearth, and testing CO and H in the flue gas ２ S and O 2 Volume fraction of (a). The measurement method mainly adopted at present is as follows: a flue gas sampling tube with the diameter of about 8mm is additionally arranged on the wall body around the water-cooled wall of the boiler in advance, and the flue gas close to the water-cooled wall is extracted by a test instrument for analysis. However, the testing method has limited test timeliness, and many power plants do not carry out the work or carry out the annual test, the measured value has long representativeness, the combustion condition in the furnace cannot be known in real time, and the power plants cannot be guided to reasonably distribute coal and reasonably carry out combustion adjustment. In addition, the power plant operating personnel have limited means for adjusting the reducing atmosphere, and often have less adjustment and consideration content, and still can cause the water wall to be seriously corroded.
On the other hand, because the furnace reducing flue gas analyzer belongs to a precise instrument, the investment is large, and if a single flue gas analyzer is arranged at each measuring point, the investment is increased, and the maintenance amount is increased.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, provides a system for testing reducing atmosphere of a boiler hearth near water-cooled wall and adjusting combustion optimization, and particularly comprises the following technical scheme:
boiler furnace is close near water-cooled wall reducing atmosphere test and burning and is patrolled excellent governing system, includes:
a plurality of flue gas sampling points are respectively and equidistantly arranged on the middle water-cooled wall of two adjacent layers of burners in the area of the pulverized coal burner, between the pulverized coal burner and the SOFA wind burner of the boiler and on the upper part of the SOFA wind burner of the boiler; a tail flue gas sampling point is arranged at the outlet of the boiler; sampling at each flue gas sampling point to obtain reducing atmosphere measurement data and hearth outlet flue gas component measurement data;
the system comprises a patrol unit, a detection unit and a control unit, wherein the patrol unit is connected with a boiler tail flue negative pressure system and comprises reducing atmosphere analysis equipment, a flue gas sampling pipe, a compressed air purging pipe and a compressed air system, the reducing atmosphere analysis equipment is communicated with each flue gas sampling point through the flue gas sampling pipe to analyze collected gas samples, each flue gas sampling pipe is provided with a sampling quick-closing valve, the compressed air system is communicated with each flue gas sampling pipe through the compressed air purging pipe in a one-to-one correspondence manner, and each compressed air purging pipe is provided with a purging quick-closing valve;
the tail flue gas sampling and analyzing unit is used for analyzing a gas sample collected by a tail flue gas sampling point, and the real-time monitored waste gas is discharged into a tail flue negative system;
the sampling control unit is used for realizing the patrol detection function of the smoke samples of each measuring point in a circulating control mode; when sampling is carried out at any smoke sampling point, controlling the sampling quick closing valve of the corresponding smoke sampling pipe to be opened, and the sampling quick closing valves of the rest smoke sampling pipes to be closed, closing the blowing quick closing valve of the corresponding compressed air blowing pipe, and closing and opening the blowing quick closing valves of the rest compressed air blowing pipes, and blowing the pipeline;
the tour optimization regulation and control unit comprises: oxygen control module, coal pulverizer play control module, primary air pressure control module and secondary air door control module, according to reducing atmosphere measured data and furnace export flue gas composition measured data are regulated and control operation oxygen volume control, mill group coal feeding volume rational arrangement, primary air pressure control and secondary air door and the air of burning out respectively.
The system for testing the reducing atmosphere close to the water-cooled wall of the boiler furnace and adjusting the combustion optimization is further designed in a way that a flue gas sampling point arranged at the upper part of the SOFA air burner of the boiler is 1m or 2m away from the SOFA air burner.
The boiler furnace near water-cooled wall reducing atmosphere testing and combustion optimizing adjusting system is further designed in that the oxygen amount control module sets a condition for oxygen amount control to judge: if two thirds of the test value in a patrol period is higher than a set value A and the NOx at the outlet of the hearth is lower than a set reference value B, triggering an oxygen control module, overlapping a forward oxygen amount bias by the oxygen control module, improving the total air supply amount of the hearth, increasing the oxygen amount of the hearth, and stopping the increase of the forward oxygen amount bias if the NOx content exceeds the set reference value B; if all the test values are lower than the set value A and the measured CO at the outlet of the furnace is lower than the set value D, setting a negative bias on the running oxygen quantity, reducing the running oxygen quantity until the measured value of two thirds of the furnace is higher than the set value A, and triggering the positive bias of the oxygen quantity.
The system for testing the reducing atmosphere of the boiler furnace near water-cooled wall and adjusting the combustion optimization is further designed in that the coal mill output control module is used for judging the high value of the reducing atmosphere measurement data of each layer of the main combustion area, then comparing the high value with the average value of the high values of all the layers, if the measurement data is higher than the average value by F, setting a negative bias to the output of the coal mill of the corresponding layer, reducing the output of the layer, and setting a lower limit value to the corresponding output.
The boiler furnace near water wall reducing atmosphere testing and combustion optimizing adjusting system is further designed in that the primary wind pressure control module carries out a primary wind pressure control program if a three-quarter test value in a polling period is higher than a set value A, a negative wind pressure bias is superposed, the negative wind pressure bias sets a lower limit value C, and the lower limit value C needs to be manually set according to different types of units.
The boiler furnace near water wall reducing atmosphere test and combustion optimizing adjustment system is further designed in that the secondary air door control module adopts an average progressive control method to judge the high value of the reducing atmosphere measurement data of each layer of the main combustion area, compares the high value of each layer with the average value of the high values of all layers, increases an opening K value on the opening of the secondary air door of the layer if the measurement data is higher than the average value by F, gradually reduces the opening of the overfire air door if the opening of the air door of the layer reaches 95% and the measurement data of the reducing atmosphere is still higher than a set value A, and stops corresponding adjustment of the overfire air opening when the NOx content of the outlet of the furnace is higher than a reference value B.
The boiler furnace near water wall reducing atmosphere testing and combustion optimizing adjusting system is further designed in the way that the K value is obtained according to the measuring data of the reducing atmosphere of the layer, when the testing value of the reducing atmosphere is higher than a set value A, K =10%, and when the testing value of the reducing atmosphere is not larger than the set value A, K = 0%.
The system for testing the reducing atmosphere near the water-cooled wall of the boiler furnace and adjusting the combustion optimization is further designed in such a way that the main combustion zone is set as a measurement layer below an over-fire air layer.
The boiler furnace near water-cooled wall reducing atmosphere testing and combustion optimizing adjusting system is further designed in that the sweeping quick-closing valve and the sampling quick-closing valve have the functions of opening and closing in a linked mode, if the flue gas sampling quick-closing valve of the flue gas sampling pipe is closed, the sweeping quick-closing valve corresponding to the flue gas sampling pipe is opened in a linked mode, the flue gas sampling quick-closing valve of the next group of flue gas sampling system is opened in a delayed mode for 30s, and meanwhile the corresponding sweeping quick-closing valve is closed.
The system for testing the reducing atmosphere of the near water-cooled wall of the boiler furnace and adjusting the combustion optimization is further designed in that the reducing atmosphere analysis equipment requires that CO measurement is carried out by adopting an infrared method, and H measurement is carried out by adopting an infrared method 2 S is measured by UV method, O 2 Then measured electrochemically; and the tail flue gas sampling and analyzing unit monitors the emission of NOx, CO and O2 by an electrochemical method. The invention has the following advantages:
the system for testing the reducing atmosphere near the water-cooled wall of the boiler furnace and adjusting the combustion optimization inspection adopts the inspection unit, only one reducing flue gas analyzer is used, the number of testing sample points is ensured, the real-time monitoring of the measuring data of the reducing atmosphere can be realized, and the investment and maintenance cost is reduced; the patrol detection unit and the tail flue gas sampling and analyzing system are both connected with a negative pressure system of a boiler tail flue, and the system forms a negative pressure system, so that a self-suction function can be realized without auxiliary increase of suction power; through the optimization treatment of the control unit, the optimization adjustment of the configuration of a secondary air door, the operation oxygen amount, the operation primary air pressure and the output of a coal mill is realized, the reducing atmosphere of a furnace near water-cooled wall is reduced, and the problem of high-temperature corrosion of the furnace is relieved or eliminated.
Drawings
FIG. 1 is a schematic diagram of the general structure and flow of the present invention.
FIG. 2 is a schematic diagram of a sampling and testing system for a reducing atmosphere analyzer.
FIG. 3 is a logic control diagram of an oxygen control module (a detection part related to NOx), a coal mill output control module and a secondary air door control module in the cruise control unit.
FIG. 4 is a logic control diagram of an oxygen control module (regarding the CO detection section).
Fig. 5 is a logic control diagram of a primary wind pressure control module.
The method comprises the following steps of 1-pulverized coal fired boiler, 2-boiler pulverized coal burner, 3-boiler SOFA air burner, 4-furnace near water wall flue gas sampling point, 5-flue gas sampling pipe, 6-reducing atmosphere analysis equipment, 7-boiler tail flue gas composition analyzer, 8-boiler DCS system, 9-feedback adjustment parameter, 10-compressed air system, 11-sampled waste gas discharge point, 12-tail flue gas sampling point, 13-compressed air purging pipe, 14-compressed air purging quick-closing valve and 15-flue gas sampling quick-closing valve.
Detailed Description
The technical solution of the present invention is further explained with reference to the specific embodiments and the accompanying drawings.
Referring to fig. 1, the system for testing reducing atmosphere and adjusting combustion optimization of the near water-cooled wall of the boiler furnace mainly comprises a flue gas sampling point, an inspection unit, a tail flue gas sampling analysis system, a sampling control unit and an optimization adjustment and control unit.
A flue gas sampling point (4) close to a water wall of a hearth is additionally arranged at a corresponding position of a water wall of a boiler, a measuring point is arranged at a fin between adjacent water wall pipelines, a sampling hole with the diameter of about 8mm is arranged at the fin, and then a flue gas sampling tube (5) is used for leading reducing atmosphere analysis equipment (6) to carry out analysis. The combustor that provides to this embodiment is the boiler of four corners tangential circle arrangement mode, the nearly water-cooled wall flue gas sampling point of furnace (4) are installed respectively around the water-cooled wall, pulverized coal burner (2) are regional, the mounted position is located the water-cooled wall in the middle of the adjacent two-layer combustor, the nearly water-cooled wall flue gas sampling point of three furnace (4) of equidistant installation, can monitor the regional reducing atmosphere of side of facing a fire and side of being away from a fire simultaneously, the concrete number of piles is decided according to actual boiler design combustor number of piles, if the water-cooled wall both sides are equipped with big bellows, then do not install. The area between the pulverized coal burner (2) and the SOFA air burner (3) of the boiler is a water wall easy-to-wear area which is an oxygen-deficient combustion area, a layer of smoke sampling points (4) close to a water wall of a hearth are required to be additionally arranged on the water wall around the area at equal intervals respectively, and the smoke sampling points (4) close to the water wall of the hearth are required to be additionally arranged on the periphery of the water wall [1m, 2m ] on the upper layer of the SOFA air burner (3) of the boiler. For a boiler with a burner arranged in a way of opposite flushing of front and rear walls, high-temperature corrosion areas of the boiler are mainly positioned on water cooling walls of left and right walls, smoke sampling points (4) close to the water cooling walls of a hearth are additionally arranged on the water cooling walls of the left and right walls of the boiler in the same way as the boiler with the burner arranged in a way of four-corner tangential circles, and the smoke sampling points (4) close to the water cooling walls of the hearth are additionally arranged at equal intervals between adjacent main burners, between the main burners and SOFA air layers and on SOFA air upper layers (1 m and 2 m) of the water cooling walls. And sampling at each flue gas sampling point to obtain reducing atmosphere measurement data.
The system of this embodiment also requires monitoring of NOx, CO, O at the boiler outlet (economizer outlet) 2 The amount of discharge of (c). Sampling is carried out at a tail flue gas sampling point (12), a boiler tail flue gas component analyzer (7) is adopted to carry out real-time monitoring on extracted sample gas to obtain tail gas measurement data, and the measurement principle can be realized by adopting an electrochemical method.
The patrol and survey unit mainly comprises a flue gas sampling tube (5), reducing atmosphere analysis equipment (6), a compressed air purging tube (13) and a compressed air system (10). Each furnace chamber near water-cooled wall flue gas sampling point (4) is respectively connected with a reducing atmosphere analysis device (6) through a flue gas sampling pipe (5), each flue gas sampling pipe (5) is provided with a flue gas sampling quick-closing valve (15), and each flue gas sampling pipe (5) can be separately controlled to independently sample. Compressed air is taken from compressed air system (10), sweeps pipe (13) through compressed air and is connected with each flue gas sampling tube (5), sweeps the flue gas sampling tube, and every compressed air sweeps pipe (13) and all sets up a compressed air and sweeps fast valve (14) that closes, and wherein the interface that compressed air swept pipe and flue gas sampling tube is located flue gas sample fast valve (15) upper reaches. When the reducing atmosphere analysis equipment (6) samples a certain measuring point, the corresponding flue gas sampling quick-closing valve (15) is opened, the corresponding compressed air purging quick-closing valve is closed, the flue gas sampling is carried out, and the other flue gas sampling quick-closing valves are closed,all the other compressed air purging quick-closing valves are opened, so that the pipeline purging effect is achieved, no residual gas is ensured in the sampling pipe, and meanwhile, the anti-blocking effect is achieved. In addition, compressed air is introduced into the furnace, so that the problem of wall brushing of smoke in the corresponding area can be reduced to a certain extent. The reducing atmosphere analysis equipment (6) of the embodiment is provided with a self-cleaning function, lasts for 30s and eliminates residual flue gas in an analysis system. The purging fast-closing valve and the sampling fast-closing valve have the functions of being opened and closed in a linked mode, if the flue gas sampling fast-closing valve of the flue gas sampling pipe is closed, the purging fast-closing valve corresponding to the flue gas sampling pipe is opened in a linked mode, the flue gas sampling fast-closing valve of the next group of flue gas sampling system is opened in a delayed mode for 30s in a linked mode, and meanwhile the corresponding purging fast-closing valve is closed in a linked mode. From which each sample point is analyzed one by one. By adopting the polling method, the number of the test sampling points is ensured, and a large amount of investment and maintenance cost is saved. The patrol unit is connected with a negative pressure system of a boiler tail flue, and the system forms a negative pressure system, so that the self-suction function can be realized without auxiliary increase of suction power. The reducing atmosphere analysis equipment of the embodiment needs to measure CO and H simultaneously 2 S、O 2 Due to the use of electrochemical methods, measuring CO and H 2 S has the problem of mutual interference, the system designs that CO measurement is carried out by adopting an infrared method, H 2 S is measured by UV method, O 2 Electrochemical measurements are used. Wherein the CO measurement range is 0-30% vol, H 2 The S measurement range is 0-2000 ppm.
Tail flue gas sampling and analyzing system with monitoring values of NOx, CO and O 2 . In the embodiment, sampling is carried out at a tail flue gas sampling point (12), a boiler tail flue gas component analyzer (7) is adopted to carry out real-time monitoring on extracted sample gas, and an electrochemical method is adopted in the measuring principle. The sampling exhaust emission system that this embodiment provided discharges reducing atmosphere analytical equipment (6) and boiler afterbody flue gas composition analysis appearance (7) real-time supervision's exhaust emission to afterbody flue negative system in, reduces the pollution of discharging waste gas to the environment.
The sampling control unit of the embodiment adopts PLC independent control, and the sampling system adopts a circulation control mode to realize the patrol function of the smoke samples of each measuring point; when sampling is carried out at any smoke sampling point, controlling the smoke sampling quick-closing valve (15) of the corresponding smoke sampling pipe (5) to be opened, closing the smoke sampling quick-closing valves (15) of the other smoke sampling pipes (5), closing the compressed air purging quick-closing valve (14) of the corresponding compressed air purging pipe (13), closing the compressed air purging quick-closing valves (14) of the other compressed air purging pipes (13) to be opened, and purging a pipeline; the compressed air purging quick-closing valve (14) and the smoke sampling quick-closing valve (15) of the embodiment have the functions of opening and closing in a linked mode, if the smoke sampling quick-closing valve (15) of the smoke sampling pipe (5) is closed, the compressed air purging quick-closing valve (14) corresponding to the smoke sampling pipe (5) is opened in a linked mode, the smoke sampling quick-closing valve of the next group of smoke sampling system is opened in a delayed mode for 30s, and meanwhile the corresponding compressed air purging quick-closing valve is closed in a linked mode.
The optimizing regulation and control unit mainly comprises an oxygen control module, a coal mill output control module, a primary air pressure control module and a secondary air door control module, and regulates and controls the running oxygen amount, the coal feeding amount of the mill group, the primary air pressure control and the secondary air door and the over fire air respectively according to the regulation and control parameters.
As shown in fig. 3 and 4, the oxygen amount control module of the present embodiment sets the following conditions for oxygen amount control: if there is two-thirds test value to be higher than setting value A in a period of patrolling and examining, and furnace outlet NOx is less than set reference value B, then trigger oxygen control module, and oxygen control system is last to overlap a forward oxygen volume biasing, improves furnace total air supply volume, increases furnace oxygen volume. However, the increase of the oxygen amount is simultaneously limited by the NOx content at the furnace outlet, and if the NOx content exceeds a set reference value B, the increase of the positive bias of the oxygen amount is stopped. In order to increase the energy-saving and consumption-reducing capacity of the unit, if all the test values are lower than a set value A and the measured CO at the outlet of the hearth is lower than a set value D in a patrol period, a negative bias is set on the running oxygen quantity, the running oxygen quantity is reduced until the measured value of two thirds of the hearth is higher than the set value A, and the positive bias of the oxygen quantity is triggered.
The coal mill output force control module of the embodiment judges the high value of each layer of reducing atmosphere measurement data (the main combustion zone is the measurement layer below the burnout air layer) in the main combustion zone, then compares the high value with the average value of the high values of all layers, and sets a negative bias to the output force of the coal mill on the corresponding layer if the measurement data is higher than the average value by F, so that the output force of the layer is reduced, but the corresponding output force needs to set a lower limit value. In order to ensure the output of the unit, the output of the lower layer coal mill needs to be increased by corresponding forward bias, the lowest layer is preferred, and when the upper limit of the output of the lower layer coal mill is triggered, the forward bias is set on the output of the second layer coal mill. In order to ensure the safe operation of the unit, the module is set to be in a manual input mode without an automatic trigger mode.
As shown in fig. 5, in the primary air pressure control module of this embodiment, if a three-quarter test value is higher than a set value a in a polling period, a primary air pressure control procedure is performed, a negative air pressure bias is superimposed on the primary air control system, so as to reduce the primary air rigidity, reduce the risk of wall brushing of the air-powder mixture, reduce the ignition heat, advance the ignition, and move down the flame center. However, a lower limit value C needs to be set for the primary wind pressure negative bias, and the lower limit value C needs to be manually set according to different types of units.
The secondary air door control module of the embodiment adopts an average progressive control method. High value judgment is carried out on the measurement data (measurement layers below the burnout air layer) of each layer of reducing atmosphere in the main combustion zone, then the high value is compared with the average value of the high values of all layers, if the measurement data is higher than the average value by F (the F is comprehensive data and is combined with different site specific settings, the F contains H 2 S, CO, any one value satisfies the validity of the trigger F value), then an opening K is added to the opening of the secondary air door (the measuring point corresponds to the next layer of combustor), when the testing value of the reducing atmosphere is higher than the set value A, K =10%, and when the testing value of the reducing atmosphere is not larger than the set value A, K = 0%.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (9)
1. The utility model provides a nearly water-cooled wall reducing atmosphere of boiler furnace tests and burning and patrols excellent adjustment system which characterized in that includes:
a plurality of flue gas sampling points are respectively and equidistantly arranged on the middle water-cooled wall of two adjacent layers of burners in the area of the pulverized coal burner, between the pulverized coal burner and the SOFA wind burner of the boiler and on the upper part of the SOFA wind burner of the boiler; a tail flue gas sampling point is arranged at the outlet of the boiler; sampling at each flue gas sampling point to obtain reducing atmosphere measurement data and hearth outlet flue gas component measurement data;
the system comprises a patrol unit, a detection unit and a control unit, wherein the patrol unit is connected with a boiler tail flue negative pressure system and comprises reducing atmosphere analysis equipment, a flue gas sampling pipe, a compressed air purging pipe and a compressed air system, the reducing atmosphere analysis equipment is communicated with each flue gas sampling point through the flue gas sampling pipe to analyze collected gas samples, each flue gas sampling pipe is provided with a sampling quick-closing valve, the compressed air system is communicated with each flue gas sampling pipe through the compressed air purging pipe in a one-to-one correspondence manner, and each compressed air purging pipe is provided with a purging quick-closing valve;
the tail flue gas sampling and analyzing unit is used for analyzing a gas sample collected by the tail flue gas sampling point, and the waste gas monitored in real time is discharged into a tail flue negative system;
the sampling control unit is used for realizing the patrol detection function of the smoke samples of each measuring point in a circulating control mode; when sampling is carried out at any smoke sampling point, controlling the sampling quick closing valve of the corresponding smoke sampling pipe to be opened, and the sampling quick closing valves of the rest of the smoke sampling pipes to be closed, closing the blowing quick closing valve of the corresponding compressed air blowing pipe, and closing and opening the blowing quick closing valves of the rest of the compressed air blowing pipes, and blowing the pipeline;
the tour optimization regulation and control unit comprises: the system comprises an oxygen control module, a coal mill output control module, a primary air pressure control module and a secondary air door control module, wherein the oxygen control module, the coal mill output control module, the primary air pressure control module and the secondary air door control module are used for respectively controlling the running oxygen amount, the reasonable coal feeding amount of a mill group, the primary air pressure control and the secondary air door and the over fire air according to the reducing atmosphere measurement data and the hearth outlet flue gas component measurement data;
the oxygen amount control module sets a condition judgment for oxygen amount control: if two thirds of the test value in a patrol period is higher than a set value A and the NOx at the outlet of the hearth is lower than a set reference value B, triggering an oxygen control module, overlapping a forward oxygen amount bias by the oxygen control module, improving the total air supply amount of the hearth, increasing the oxygen amount of the hearth, and stopping the increase of the forward oxygen amount bias if the NOx content exceeds the set reference value B; if all the test values are lower than the set value A and the measured CO at the outlet of the furnace is lower than the set value D, setting a negative bias on the running oxygen quantity, reducing the running oxygen quantity until the measured value of two thirds of the furnace is higher than the set value A, and triggering the positive bias of the oxygen quantity.
2. The system for testing reducing atmosphere and adjusting combustion optimization of the boiler furnace near water-cooled wall according to claim 1, is characterized in that: the distance between the sampling point of the flue gas arranged at the upper part of the SOFA air burner of the boiler and the SOFA air burner is 1m and 2 m.
3. The system for testing reducing atmosphere and adjusting combustion optimization of the boiler furnace near water-cooled wall according to claim 1, is characterized in that: and the coal mill output control module is used for judging the high value of the measurement data of the reducing atmosphere of each layer in the main combustion area, then comparing the high value with the average value of the high values of all the layers, and if the measurement data is higher than the average value by F, setting a negative bias on the output of the coal mill of the corresponding layer to reduce the output of the layer, but setting a lower limit value on the corresponding output.
4. The boiler furnace near water wall reducing atmosphere testing and combustion optimizing adjusting system according to claim 1, characterized in that: and if three-quarter test values in a patrol period are higher than a set value A, the primary wind pressure control module performs a primary wind pressure control program, a negative wind pressure bias is superposed, a lower limit value C is set in the negative wind pressure bias, and the lower limit value C needs to be manually set according to different types of units.
5. The system for testing reducing atmosphere and adjusting combustion optimization of the boiler furnace near water-cooled wall according to claim 1, is characterized in that: the secondary air door control module adopts an average progressive control method to judge the high value of the reducing atmosphere measured data of each layer of the main combustion zone, compares the high value of each layer with the average value of the high values of all the layers, if the measured data is higher than the average value by F, an opening K value is added to the opening of the secondary air door of the layer, if the opening of the air door of the layer reaches 95 percent and the reducing atmosphere measured data is still higher than a set value A, the opening of the burnout air door is adjusted by-5 percent, the opening of the burnout air door is gradually reduced from the top layer of the burnout air, and when the content of NOx at the outlet of the hearth is higher than a reference value B, the corresponding burnout air opening adjustment is stopped.
6. The system for testing reducing atmosphere and adjusting combustion optimization of the boiler furnace near water-cooled wall according to claim 5, is characterized in that: the K value is obtained according to the measurement data of the reducing atmosphere of the layer, when the testing value of the reducing atmosphere is higher than the set value A, K is 10%, and when the testing value of the reducing atmosphere is not more than the set value A, K is 0%.
7. The system for testing reducing atmosphere and adjusting combustion optimization of the boiler furnace near water-cooled wall according to claim 3 or 5, is characterized in that: the main burning zone is set as a measuring layer below the over-fire air layer.
8. The system for testing reducing atmosphere and adjusting combustion optimization of the boiler furnace near water-cooled wall according to claim 1, is characterized in that: the purging quick-closing valve and the sampling quick-closing valve have the functions of being opened and closed in a linked mode, if the flue gas sampling quick-closing valve of the flue gas sampling pipe is closed, the purging quick-closing valve corresponding to the flue gas sampling pipe is opened in a linked mode, the flue gas sampling quick-closing valve of the next group of flue gas sampling system is opened in a delayed mode for 30s in a linked mode, and meanwhile the corresponding purging quick-closing valve is closed in a linked mode.
9. The boiler furnace near water wall reducing atmosphere test according to claim 1And a combustion optimizing adjusting system, which is characterized in that: the reducing atmosphere analysis equipment requires that CO measurement is carried out by adopting an infrared method, H 2 S is measured by UV method, O 2 Electrochemical measurements are used; the tail flue gas sampling and analyzing unit monitors NOx, CO and O by an electrochemical method 2 The amount of discharge of (c).
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| CN112763648A (en) * | 2020-11-25 | 2021-05-07 | 华能国际电力股份有限公司德州电厂 | Method for measuring flue gas atmosphere of hearth of lean coal boiler |
| CN112648607A (en) * | 2020-11-25 | 2021-04-13 | 华能国际电力股份有限公司德州电厂 | Water-cooled wall local reducing atmosphere monitoring system for online CO monitoring by grid method |
| CN112555896A (en) * | 2020-12-14 | 2021-03-26 | 国家能源菏泽发电有限公司 | Intelligent analysis system and method for boiler combustion efficiency of thermal power plant |
| CN113137625A (en) * | 2021-04-15 | 2021-07-20 | 苏州西热节能环保技术有限公司 | Method for relieving high-temperature corrosion of cold ash bucket of tangential firing boiler |
| CN113669753B (en) * | 2021-08-16 | 2024-01-26 | 华北电力科学研究院有限责任公司 | Method, system and device for determining excess air coefficient of flame in hearth |
| CN113983489B (en) * | 2021-10-09 | 2024-01-19 | 苏州西热节能环保技术有限公司 | Secondary air distribution method for active corrosion prevention of opposed firing boiler |
| CN114135897B (en) * | 2021-11-24 | 2023-12-19 | 吉林省电力科学研究院有限公司 | Online monitoring method for high-sulfur coal fired boiler |
| CN114755069B (en) * | 2022-06-14 | 2022-11-01 | 安诺克斯(北京)环境科技有限公司 | Dynamic multipoint real-time monitoring system of sampling pipeline |
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| CN105675810B (en) * | 2016-01-18 | 2017-10-20 | 南京博沃科技发展有限公司 | A kind of monitoring method of boiler water-cooling wall high-temperature corrosion atmosphere monitoring system and high-temperature corrosion atmosphere |
| CN106196149B (en) * | 2016-08-03 | 2017-12-19 | 国网山东省电力公司电力科学研究院 | Boiler water wall surface oxidation atmosphere active strengthening system and method, boiler |
| CN106644612B (en) * | 2017-02-27 | 2023-07-25 | 国电科学技术研究院有限公司 | Flue gas grouping on-line monitoring system for near-wall area of boiler water-cooled wall |
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| CN110426494A (en) * | 2019-08-08 | 2019-11-08 | 艾俊清 | Method based on the reduction unburned carbon in flue dust monitored on-line of water cooling wall region CO in furnace |
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