CN113230847A - Automatic centralized monitoring system for wet flue gas desulfurization multi-furnace multi-tower oxidation air volume - Google Patents
Automatic centralized monitoring system for wet flue gas desulfurization multi-furnace multi-tower oxidation air volume Download PDFInfo
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- 238000007254 oxidation reaction Methods 0.000 title claims abstract description 83
- 230000003647 oxidation Effects 0.000 title claims abstract description 82
- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 18
- 230000023556 desulfurization Effects 0.000 title claims abstract description 18
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 14
- 239000003546 flue gas Substances 0.000 title claims abstract description 14
- 238000012544 monitoring process Methods 0.000 title claims abstract description 13
- 239000002002 slurry Substances 0.000 claims abstract description 50
- 238000010521 absorption reaction Methods 0.000 claims abstract description 35
- 238000005259 measurement Methods 0.000 claims abstract description 9
- 238000006243 chemical reaction Methods 0.000 claims abstract description 5
- 230000007246 mechanism Effects 0.000 claims description 17
- 239000007788 liquid Substances 0.000 claims description 12
- 230000001105 regulatory effect Effects 0.000 claims description 9
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- 238000010168 coupling process Methods 0.000 claims description 3
- 238000005859 coupling reaction Methods 0.000 claims description 3
- 238000005070 sampling Methods 0.000 abstract description 8
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical compound OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 abstract description 4
- 230000008901 benefit Effects 0.000 abstract description 4
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 238000004891 communication Methods 0.000 abstract description 2
- 230000008859 change Effects 0.000 description 14
- 238000000034 method Methods 0.000 description 12
- 230000008569 process Effects 0.000 description 10
- 238000001514 detection method Methods 0.000 description 7
- 239000003245 coal Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 238000011010 flushing procedure Methods 0.000 description 5
- 229920000742 Cotton Polymers 0.000 description 4
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 4
- 230000006870 function Effects 0.000 description 4
- 239000010440 gypsum Substances 0.000 description 4
- 229910052602 gypsum Inorganic materials 0.000 description 4
- 239000010410 layer Substances 0.000 description 4
- 239000011593 sulfur Substances 0.000 description 4
- 229910052717 sulfur Inorganic materials 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 150000002500 ions Chemical class 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000004321 preservation Methods 0.000 description 3
- GBAOBIBJACZTNA-UHFFFAOYSA-L calcium sulfite Chemical compound [Ca+2].[O-]S([O-])=O GBAOBIBJACZTNA-UHFFFAOYSA-L 0.000 description 2
- 235000010261 calcium sulphite Nutrition 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 239000000523 sample Substances 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 235000019738 Limestone Nutrition 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- 230000008025 crystallization Effects 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 231100000572 poisoning Toxicity 0.000 description 1
- 230000000607 poisoning effect Effects 0.000 description 1
- 238000011897 real-time detection Methods 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
- B01D53/501—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound
- B01D53/504—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound characterised by a specific device
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
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Abstract
The invention discloses a multi-furnace multi-tower oxidation air volume centralized automatic monitoring system for wet flue gas desulfurization, which belongs to the technical field of wet flue gas desulfurization, and comprises two groups of absorption towers for desulfurization reaction and also comprises: the main pipe is arranged between the two groups of absorption towers, and is provided with a plurality of groups of branch pipes which respectively extend into the two groups of absorption towers; the invention utilizes the configuration of a DCS control room control system to complete the realization of the control function of the whole system, a slurry oxidation analyzer is used for sampling and analyzing the oxidation index of slurry in an absorption tower, namely, the concentration of sulfite which is a residual product of slurry oxidation is controlled in a specified range, a measurement signal is transmitted into the DCS control room, real-time early warning is provided when the slurry is seriously insufficient to ensure that the unit is safely operated without environmental accidents, the independent control of a single furnace and the centralized control switching of two furnaces can be realized by opening and closing a main pipe and an electric communication door, and the overall advantage of the maximized utilization of system resources is exerted.
Description
Technical Field
The invention belongs to the technical field of wet flue gas desulfurization, and particularly relates to a multi-furnace multi-tower oxidation air volume centralized automatic monitoring system for wet flue gas desulfurization.
Background
At present, more than 90 percent of domestic thermal power plants adopt limestone-gypsum wet desulphurization technology. However, the oxidation link in the wet desulphurization process is not well known, the wet desulphurization process is divided into four stages of absorption, neutralization, oxidation and crystallization, and the biggest difference between the wet desulphurization process and other desulphurization modes (such as a dry method, a semi-dry method and the like) is that calcium sulfite is fully oxidized in the oxidation process, and finally, the calcium sulfite is crystallized into gypsum capable of being comprehensively utilized. The problem that an oxidation stage has no control means generally exists in the wet desulphurization process, the oxidation stage has no reliable and effective monitoring means in the wet desulphurization process, SO2 in flue gas caused by insufficient oxidation air volume can not be fully absorbed and discharged to exceed the standard due to the change of the sulfur content of coal, human factors and the like, the risks of slurry poisoning, increased operation cost (large limestone consumption), reduced gypsum purity, difficult gypsum dehydration and the like are caused, meanwhile, when a unit runs at low load, the excessive oxidation air volume causes the risks of large electric energy loss of an oxidation fan, increased wastewater treatment difficulty, dust discharge exceeding the standard and the like, the model selection of the oxidation fan is designed on the basis of the BMCR working condition of a boiler and the sulfur content of coal of designed coal, and because of no on-line measuring instrument and automatic control function, the fan is manually operated in a rated current mode under the BMCR working condition according to operation rules, most of the oxidation air volume is wasted; and the oxidation air system adopts a single-furnace operation mode, the unit systems with the same capacity are not shared, the spare oxidation fans are more, the air quantity cannot be controlled in a centralized manner, the adjustment allowance of a single tower cannot be fully utilized, the functions of multi-furnace multi-tower centralized control and single-tower independent adjustment are not exerted, the waste that equipment resources and air quantity cannot share automatic matching is caused, and the overall advantage cannot be exerted.
Disclosure of Invention
The invention provides a multi-furnace multi-tower oxidation air volume centralized automatic monitoring system for wet flue gas desulfurization, which aims to solve the problems mentioned in the background.
In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a many stoves of wet flue gas desulfurization tower oxidation amount of wind automatic monitoring system in concentration, includes two sets of absorption towers that are used for desulfurization reaction, still includes:
the main pipe is arranged between the two groups of absorption towers, a plurality of groups of branch pipes are arranged on the main pipe, the plurality of groups of branch pipes respectively extend into the two groups of absorption towers, and an electric connection door is arranged on the main pipe;
slurry oxidation analyzers, namely SOAs, are respectively arranged at the outer sides of the two groups of absorption towers, and liquid inlets of the slurry oxidation analyzers are communicated with the absorption towers;
the DCS control chamber is arranged below the electric contact door, a signal input end of the DCS control chamber is electrically connected with a measurement signal output end of the slurry oxidation analyzer, and a signal output end of the DCS control chamber is electrically connected with the electric contact door;
the oxidation fan is provided with four groups, and two groups are that a unit sets up respectively in electronic contact door both sides, the air outlet of oxidation fan all communicates female pipe, the signal output part of oxidation fan electric connection DCS control room.
Preferably, the air inlet of the oxidation fan is provided with a regulating device, namely SSR.
Preferably, a branch tower flow regulating device is arranged at a position of the main pipe close to the absorption tower.
Preferably, the adjusting device comprises a fixed disk fixed with the oxidation fan, an air inlet shell is arranged on one side of the fixed disk, a fairing is arranged inside the air inlet shell, a fan body is arranged on the other side of the fixed disk, a fan impeller is arranged inside the fan body, and an adjusting mechanism is arranged on the periphery of the air inlet shell;
adjustment mechanism is including setting up the circumferential strip in the outside of air inlet casing, the periphery of circumferential strip evenly is provided with the dead lever, the outer end of dead lever all is provided with the movable block, set up flutedly on the movable block, the dead lever sets up in the recess, the last fixed axis of rotation that is provided with of movable block, the axis of rotation runs through and stretches into inside the air inlet casing, the axis of rotation is connected with the rotation of air inlet casing, the one end that the axis of rotation is located the air inlet casing inside is provided with the blade.
Preferably, the oxidation fan comprises a fan body, a fan impeller is arranged in the fan body, and a fan volute is arranged on one side of the fan body.
Preferably, a driving mechanism is arranged on the ring strip;
actuating mechanism is including fixing the fixed column at the girth outside surface, the outside of fixed column is provided with the fixed strip, the notch has been seted up on the fixed strip, the fixed column sets up in the notch, the one end of fixed strip sets up the dwang, the outside of dwang is provided with the sleeve, telescopic outside one side is provided with the fixed plate, the fixed plate is fixed outside the air inlet casing, the dwang stretches out telescopic upper end rigid coupling and has the movable rod.
Preferably, one end of the movable rod is provided with an actuator.
Preferably, the fairing is provided with a spherical shape on one side and a long cylinder shape on one side.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention utilizes the configuration of a DCS control room control system to complete the realization of the control function of the whole system, a slurry oxidation analyzer is used for sampling and analyzing the oxidation index of slurry in an absorption tower, namely, the concentration of sulfite which is a residual product of slurry oxidation is controlled in a specified range, a measurement signal is transmitted into the DCS control room, real-time early warning is provided when the slurry is seriously insufficient to ensure that the unit is safely operated without environmental accidents, a main pipe is opened and closed and an electric communication door is used for realizing the independent control of a single furnace and the centralized control switching of two furnaces, the operation flexibility of the system is improved, and the overall advantage of the maximized utilization of system resources is exerted; according to the overall control range of SOA oxidation indexes of the two absorption towers, the opening of an inlet valve of the centrifugal fan is automatically controlled by the DCS control room, so that the continuous and accurate adjustment of the oxidation air quantity of the two absorption towers along with the load of a random group and the change of the sulfur content of fire coal is met, the automatic energy-saving operation of an oxidation air system is realized, and the oxidation air quantity is utilized to the maximum extent; and the tower-dividing flow regulating devices respectively arranged on the branch pipes of each absorption tower automatically regulate the air volume according to the deviation of the oxidation index and a set value, so that the air volume of each tower is automatically matched as required.
2. The box body of the slurry oxidation analyzer disclosed by the invention is isolated from air, so that data distortion caused by air oxidation is avoided, a certain speed and direction vortex is formed by slurry entering the sampler from the sampling pipe, the analyzer body can be stably and continuously detected by the flow direction change of the slurry, and a measurement signal is transmitted to the DCS control chamber, so that real-time monitoring is realized, the slurry can be prevented from being deposited and blocked by the flushing water of a specific flushing water pipe, and the problem of detection data fluctuation caused by bubbles caused by the quality problem of the slurry is solved; the heat preservation cotton and the heat preservation layer protect the temperature of the slurry to be stable, and the distortion of other ion point positions to the detection data is isolated, so that the detection is accurate, and the real-time detection is realized.
3. The adjusting device has a large adjusting range and excellent adjusting performance;
through the passageway that forms between air inlet casing, radome fairing, blade and air inlet casing and the radome fairing, have unique variable geometry runner, be different from the adjustable stator in the import of fan factory present configuration, if: petal valve can effectively reduce the impact and the flow friction loss of air current, forms the swirl field in advance, and effectual reduction guarantees that the wind pressure reaches the technological requirement because the wind pressure loss that the inlet valve opening degree of adjusting low caused, has unique wind field design to guarantee that fan regulation performance is stable, adjust the degree of depth big, there is not ordinary fan entry, if: the butterfly, the gate valve and the petal valve have dead zones during adjustment, the rotating speed of the fan is kept unchanged, but the current of the motor can be reduced by timely changing the flow of the fan, so that a large amount of electricity can be saved, and if the fan works under 70% load, the electricity saving rate can reach 15-20% or even more;
4. the adjusting device reduces surge and enlarges a working area;
the invention is different from the traditional adjusting mode which is easy to cause the surging of the fan, the working interval is far less than the requirement of the change of the actual working condition, and the great waste of resources is caused.
5. The adjusting device is efficient and energy-saving, and the manufacturing cost is reduced;
the integrated technology has high economic value, is convenient to install, does not need any change on the original fan unit, and has relatively gentle fan pressure drop in the adjusting process, so the requirement of a user on the fan pressure can be considered while the air supply amount is reduced, the maintenance and maintenance workload is extremely low, the fan flow can be dynamically and finely adjusted in real time according to the actual operation working condition, the precision is high, the adjusting performance is stable, the excellent flow-pressure adjusting performance is realized, the motor does not need to be modified and replaced, the cost performance is very high, and the fan unit is suitable for popularization.
Drawings
FIG. 1 is a schematic structural diagram of an automatic monitoring and centralized control system for wet flue gas desulfurization and oxidation air volume.
FIG. 2 is a schematic view of the connecting structure of the SSR and the oxidation fan.
Fig. 3 is a schematic view of the internal structure of the air intake housing of the present invention.
Fig. 4 is a schematic structural diagram of the driving mechanism of the present invention.
Fig. 5 is a schematic structural diagram of the adjusting mechanism of the present invention.
FIG. 6 is a connection structure diagram of the ring strip, the fixed rod, the groove and the movable block.
Fig. 7 is a schematic view of the state of adjustment of the adjusting mechanism of the present invention.
FIG. 8 is a comparison graph of the surge limit of the ordinary blower with the SSR.
FIG. 9 is a comparison graph of the original wind speed and the SSR added.
FIG. 10 is a schematic view of the structure of the slurry oxidation analyzer of the present invention.
FIG. 11 is a side view of a slurry oxidation analyzer of the present invention.
FIG. 12 is a schematic perspective view of a slurry oxidation analyzer according to the present invention.
Fig. 13 is a schematic diagram of the system of the present invention.
In the figure: 1. an air inlet housing; 2. a cowling; 3. a drive mechanism; 31. an actuator; 32. a fixing plate; 33. a sleeve; 34. a fixing strip; 35. fixing a column; 36. a notch; 37. rotating the rod; 38. a movable rod; 4. a fan impeller; 5. a fan volute; 6. a fan body; 7. fixing the disc; 8. an adjustment mechanism; 81. a blade; 82. a ring strip; 83. fixing the rod; 84. a groove; 85. a movable block; 86. a rotating shaft; 101. a seal member; 102. flushing the water pipe; 103. a sampler; 104. a liquid collector; 105. a liquid baffle; 106. a heat-insulating layer; 107. a platform base; 108. a lifting frame; 109. a placing table; 110. heat preservation cotton; 111. a sampling tube; 112. a display screen; 113. an analyzer body; 114. a first door; 115. a blow-off pipe; 116. a box body; 117. a second door.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-13, the present invention provides the following technical solutions:
example 1
The utility model provides a many stoves of wet flue gas desulfurization tower oxidation amount of wind automatic monitoring system in concentration, includes two sets of absorption towers that are used for desulfurization reaction, still includes:
the main pipe is arranged between the two groups of absorption towers, a plurality of groups of branch pipes are arranged on the main pipe, the plurality of groups of branch pipes respectively extend into the two groups of absorption towers, an electric connection door is arranged on the main pipe, and a tower splitting flow adjusting device is arranged at the position, close to the absorption towers, of the main pipe;
slurry oxidation analyzers, namely SOAs, are respectively arranged at the outer sides of the two groups of absorption towers, and liquid inlets of the slurry oxidation analyzers are communicated with the absorption towers;
the DCS control chamber is arranged below the electric contact door, a signal input end of the DCS control chamber is electrically connected with a measurement signal output end of the slurry oxidation analyzer, and a signal output end of the DCS control chamber is electrically connected with the electric contact door;
the oxidation fan adopts centrifugal fan, is provided with four groups, and two sets of unit that are set up respectively in electronic contact door both sides, the air outlet of oxidation fan all communicates female pipe, the signal output part of oxidation fan electric connection DCS control room.
Specifically, the control function of the whole system is realized by utilizing the configuration of a DCS control room control system, a slurry oxidation analyzer monitors the slurry oxidation index in real time, namely, the concentration of sulfite which is a residual product of slurry oxidation is controlled in a specified range, a measurement signal is transmitted into the DCS control room, real-time early warning is provided when the slurry oxidation is serious and insufficient, the safe operation of a unit is ensured, no environmental protection accident occurs, the independent control of a single furnace and the centralized control switching of two furnaces can be realized by opening and closing a main pipe and an electric contact door, the operation flexibility of the system is improved, the overall advantage of the maximized utilization of system resources is exerted, the air volume of each absorption tower is independently controlled, the accurate adjustment is realized by utilizing a sub-tower flow regulating device according to the load of each unit and the slurry oxidation index of the absorption tower, and the automatic matching is realized according to requirements.
Example 2
As an optional situation, please refer to fig. 1 and fig. 10-12, a centralized automatic monitoring system for wet flue gas desulfurization multi-furnace multi-tower oxidation air volume, wherein a slurry oxidation analyzer comprises a box body 116, a liquid collector 104 is arranged inside the box body 116, a drain pipe 115 is arranged at the bottom of the liquid collector 104 for discharging slurry in the liquid collector 104, the drain pipe 115 extends into the outside of the box body 116, and a liquid baffle plate 105 is arranged below the liquid collector 104 for preventing slurry from leaking; a sampler 103 is arranged above the liquid collector 104, a placing table 109 is arranged on the outer side of the bottom of the sampler 103, a lifting frame 108 is arranged at the lower end of the placing table 109, a sealing element 101 is arranged at the upper end of a box body 116, an analyzer body 113 is arranged at the upper end of the sealing element 101, a measuring signal of the analyzer body 113 is input into a DCS control room, a first box door 114 which is hinged to the surface of the analyzer body 113 is arranged for viewing analysis data, and a display screen 112 is arranged in the middle of the first box door 114; a detection probe of the analyzer body 113 is inserted into the sampler 103, a sampling tube 111 is arranged at the rear side of the box body 116, and the sampling tube 111 extends into the sampler 103 and is attached along the inner wall of the sampler 103; in order to stably support the platform base 107, the platform base 107 is arranged at the bottom of the box body 116;
in this embodiment, in order to avoid the thick liquid sediment jam, and can eliminate the bubble, prevent the bubble gathering, the rear side of box 116 is provided with wash pipe 102, and wash pipe 102 stretches into in sampler 103, and sets up along the laminating of sampler 103 inner wall.
In this embodiment, in order to protect the temperature stability of the slurry and isolate the distortion of the detection data caused by other ion point positions, the surface of the box 116 is hinged with a second box door 117, the adjacent surfaces of the closed positions of the second box door 117 and the box 116 are both provided with an insulating layer 106, and the interlayer of the inner wall of the box 116 is provided with insulating cotton 110.
Specifically, slurry in the absorption tower continuously enters the sampler 103 through the sampling pipe 101, the oxidation index of the slurry is measured through a probe of the analyzer body 113, namely, the concentration of sulfite which is a residual product of slurry oxidation is controlled in a specified range, air is isolated through the box body 116, so that data distortion caused by air oxidation is avoided, the slurry enters the sampler 103 from the sampling pipe 111 to form a vortex with a certain speed and direction, the analyzer body 113 can stably and continuously detect the slurry through flow direction conversion of the slurry, a measurement signal is transmitted to the DCS control chamber, the slurry can be prevented from being precipitated and blocked by flushing of a specific flushing water pipe 102, and the problem of detection data fluctuation caused by bubbles caused by the problem of slurry quality is solved; the heat insulation cotton 106 and the heat insulation layer 110 protect the temperature stability of the slurry and isolate the distortion of other ion point positions to the detection data.
The scheme in this embodiment can be selectively combined with the scheme in other embodiments.
Example 3
As an optional situation, please refer to fig. 2-9, an automatic monitoring and centralized control system for wet flue gas desulfurization and oxidation air volume, wherein an oxidation separator comprises a fan body, a fan impeller 4 is arranged inside the fan body 6, a fan volute 5 is arranged on one side of the fan body 6, an air inlet of the oxidation fan is provided with a regulating device, namely an SSR, the regulating device comprises a fixed disk 7 fixed with the oxidation fan, an air inlet housing 1 is arranged on one side of the fixed disk 7, a fairing 2 is arranged inside the air inlet housing 1, the fairing 2 is arranged in a spherical shape on one side and in a long cylindrical shape on one side, so that the turbulent flow generated before air enters the fan can be well regulated, unnecessary mechanical wear and energy loss are reduced, and the fan can be used more efficiently; the air inlet shell 1 and the fairing 2 form a unique air inlet channel, so that air can be reasonably turned and is closer to the wind direction of the fan impeller 4, and the air inflow speed is increased; the periphery of the air inlet shell 1 is provided with an adjusting mechanism 8;
For driving and adjusting, the ring strip 82 is provided with a driving mechanism 3;
In the prior art, a fan always works in combination with a pipe network, if the resistance of a pipe network system is stable in the combined work, the fan also can work stably under a certain working condition, and the working condition is the design working condition of the fan. The resistance of the pipe network can change frequently in the actual production operation, namely the performance change curve of the pipe network, and the flow and pressure change of the fan is required to meet the specific value according to the requirement of the production process. According to the change of the performance of the pipe network, the performance curve of the pipe network is correspondingly changed, and the process is called as the performance adjustment of the fan. The adjusting device can achieve the purpose of changing the performance of the fan by changing the angle of the inlet air flow entering the fan impeller 4, and simultaneously can change the boundary, the flow, the air pressure and the shaft power, as shown in fig. 7, when the equal-pressure outlet and equal-flow adjustment of the fan are adopted, the power of the fan body 6 is obviously reduced due to the large reduction of the flow and the higher adjusting efficiency, thereby achieving the dual purposes of saving power and adjusting, and the adjusting device is operated according to the change of working conditions to implement remote manual operation or automatic control.
According to the velocity triangle, the velocity of the fluid in the fan wheel 4 is the sum of the vectors of the tangential traction velocity along the fan wheel 4 and the axial relative velocity, see fig. 8. The adjusting device changes the wind direction and strengthens the wind speed, so that the wind speed at the outlet of the fan body 6 is increased, and the wind direction opposite to the running direction of the fan is formed. According to the wind pressure formula, the wind pressure and the wind speed are in a direct proportion relation, and when the wind speed is increased, the wind pressure is also increased along with the increase of the wind speed. Therefore, the stability of the wind pressure at the outlet of the fan body 6 well kept by the adjusting device can better meet the requirement of the desulfurization oxidation wind process, a wind direction opposite to the fan body 6 can be formed through the blades 81 to form a rotational flow field, the loss of the wind pressure can be effectively reduced, and the energy loss is reduced.
Specifically, during the use, it rotates to drive movable rod 38 through executor 31, thereby drive dwang 37 and fixed strip 34 and rotate, it rotates along air inlet casing 1 to drive fixed column 35 and gird 82 through notch 36, thereby it rotates to drive dead lever 83, it rotates to drive movable block 85 through dead lever 83, it rotates to drive axis of rotation 86, finally drive blade 81 and rotate, thereby it changes the direction of entry air to make to reach the change blade 81 direction, form the air current unanimous with fan wheel 4 turning, make in the more efficient entering fan body 6 of air, the more efficient operation of fan body 6.
The scheme in this embodiment can be selectively combined with the scheme in other embodiments.
The working principle and the using process of the invention are as follows: when the device is used, a slurry oxidation analyzer, namely an SOA (service oriented architecture) samples from a position representative of the slurry oxidation reaction of the absorption tower, the slurry is connected through a pipeline, the slurry of the absorption tower continuously enters the SOA, the SOA measures in real time, and the slurry oxidation index is measured; the SOA transmits a measurement signal to the DCS system chamber, the DCS system chamber controls the size of an inlet by controlling the operation of the oxidizing fan inlet adjusting device, the DCS system chamber controls the closing or opening of the electric contact door to realize the independent control of a single furnace and the centralized control switching of two furnaces, and the opening of the inlet valve of the centrifugal fan is automatically controlled according to the overall control range of SOA oxidation indexes of the two absorption towers, so that the continuous and accurate adjustment of the oxidation air volume of the two absorption towers along with the load of a random group and the change of the sulfur content of fire coal is met; and the tower-dividing flow regulating devices respectively arranged on the branch pipes of each absorption tower automatically regulate the air volume according to the deviation of the oxidation index and a set value, so that the air volume of each tower is automatically matched as required.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. The utility model provides a many stoves of wet flue gas desulfurization tower oxidation amount of wind automatic monitoring system in concentration, includes two sets of absorption towers that are used for desulfurization reaction, its characterized in that still includes:
the main pipe is arranged between the two groups of absorption towers, a plurality of groups of branch pipes are arranged on the main pipe, the plurality of groups of branch pipes respectively extend into the two groups of absorption towers, and an electric connection door is arranged on the main pipe;
the slurry oxidation analyzers are respectively arranged at the outer sides of the two groups of absorption towers, and liquid inlets of the slurry oxidation analyzers are communicated with the absorption towers;
the DCS control chamber is arranged below the electric contact door, a signal input end of the DCS control chamber is electrically connected with a measurement signal output end of the slurry oxidation analyzer, and a signal output end of the DCS control chamber is electrically connected with the electric contact door;
the oxidation fan is provided with four groups, and two groups are that a unit sets up respectively in electronic contact door both sides, the air outlet of oxidation fan all communicates female pipe, the signal output part of oxidation fan electric connection DCS control room.
2. The system of claim 1, wherein the system comprises: and an air inlet of the oxidation fan is provided with an adjusting device.
3. The system of claim 1, wherein the system comprises: and a tower dividing flow regulating device is arranged at the position of the main pipe close to the absorption tower.
4. The system of claim 2, wherein the system comprises: the adjusting device comprises a fixed disk fixed with the oxidation fan, an air inlet shell is arranged on one side of the fixed disk, a fairing is arranged inside the air inlet shell, a fan body is arranged on the other side of the fixed disk, a fan impeller is arranged inside the fan body, and an adjusting mechanism is arranged on the periphery of the air inlet shell;
adjustment mechanism is including setting up the circumferential strip in the outside of air inlet casing, the periphery of circumferential strip evenly is provided with the dead lever, the outer end of dead lever all is provided with the movable block, set up flutedly on the movable block, the dead lever sets up in the recess, the last fixed axis of rotation that is provided with of movable block, the axis of rotation runs through and stretches into inside the air inlet casing, the axis of rotation is connected with the rotation of air inlet casing, the one end that the axis of rotation is located the air inlet casing inside is provided with the blade.
5. The system of claim 1, wherein the system comprises: the oxidation fan comprises a fan body, a fan impeller is arranged in the fan body, and a fan volute is arranged on one side of the fan body.
6. The system of claim 4, wherein the system comprises: the ring strip is provided with a driving mechanism;
actuating mechanism is including fixing the fixed column at the girth outside surface, the outside of fixed column is provided with the fixed strip, the notch has been seted up on the fixed strip, the fixed column sets up in the notch, the one end of fixed strip sets up the dwang, the outside of dwang is provided with the sleeve, telescopic outside one side is provided with the fixed plate, the fixed plate is fixed outside the air inlet casing, the dwang stretches out telescopic upper end rigid coupling and has the movable rod.
7. The system of claim 6, wherein the system comprises: one end of the movable rod is provided with an actuator.
8. The system of claim 4, wherein the system comprises: the fairing is set to be spherical on one side and long-barrel-shaped on one side.
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| CN202110627907.0A CN113230847A (en) | 2021-06-05 | 2021-06-05 | Automatic centralized monitoring system for wet flue gas desulfurization multi-furnace multi-tower oxidation air volume |
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