CN217526992U - Flue gas denitration treatment system - Google Patents
Flue gas denitration treatment system Download PDFInfo
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- CN217526992U CN217526992U CN202220605391.XU CN202220605391U CN217526992U CN 217526992 U CN217526992 U CN 217526992U CN 202220605391 U CN202220605391 U CN 202220605391U CN 217526992 U CN217526992 U CN 217526992U
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 151
- 239000003546 flue gas Substances 0.000 title claims abstract description 151
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 claims abstract description 360
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 278
- 238000001514 detection method Methods 0.000 claims abstract description 181
- 229910021529 ammonia Inorganic materials 0.000 claims abstract description 124
- 238000002347 injection Methods 0.000 claims description 100
- 239000007924 injection Substances 0.000 claims description 100
- 239000007789 gas Substances 0.000 claims description 43
- 230000005611 electricity Effects 0.000 claims description 3
- 238000005507 spraying Methods 0.000 abstract description 16
- 230000000694 effects Effects 0.000 abstract description 14
- 238000000034 method Methods 0.000 abstract description 11
- 230000008569 process Effects 0.000 abstract description 8
- 238000012545 processing Methods 0.000 abstract description 8
- GQPLMRYTRLFLPF-UHFFFAOYSA-N Nitrous Oxide Chemical compound [O-][N+]#N GQPLMRYTRLFLPF-UHFFFAOYSA-N 0.000 description 110
- 238000006243 chemical reaction Methods 0.000 description 7
- 239000003054 catalyst Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 239000001272 nitrous oxide Substances 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 238000010790 dilution Methods 0.000 description 3
- 239000012895 dilution Substances 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 238000004868 gas analysis Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000005192 partition Methods 0.000 description 3
- 238000005070 sampling Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000000498 cooling water Substances 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000036544 posture Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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Abstract
The application provides a flue gas denitration processing system, flue gas denitration processing system includes: the device comprises a flue gas treatment flue, a detection device and a control device, wherein the flue gas treatment flue comprises an input end and an output end, and is provided with a detection hole; the nitrogen oxide detection device is inserted into the detection hole, and the detection end of the nitrogen oxide detection device is positioned outside the flue gas treatment flue; the reactor is positioned in the flue gas treatment flue and is used for reacting nitrogen oxides in the flue gas treatment flue with ammonia gas; the ammonia spraying end of the ammonia spraying device is positioned inside the flue gas treatment flue, and the ammonia spraying device is positioned between the input end and the reactor; and the nitrogen oxide detection device and the ammonia spraying device are respectively electrically connected with the control device. The technical scheme of the application improves the control effect that improves nitrogen oxide at least in the process of handling nitrogen oxide.
Description
Technical Field
The application relates to the technical field of environmental protection, especially, relate to a flue gas denitration processing system.
Background
With the increasing awareness of environmental protection, strict requirements are imposed on flue gas discharged by factories, and especially strict emission standards are imposed on the emission of nitrogen oxides. Based on this, in the prior art, before the flue gas is discharged, the flue gas is generally required to be treated so as to reach the corresponding discharge standard.
At present, in the process of treating nitrogen oxides in flue gas, ammonia gas is generally required to be sprayed into a flue so as to react with the nitrogen oxides, thereby reducing the content of the nitrogen oxides in the flue gas. However, when the amount of ammonia gas introduced is insufficient, the content of nitrogen oxides in the flue gas becomes high, and when the amount of ammonia gas is excessively introduced, the cost for treating nitrogen oxides increases. It can be seen that, at present, in the process of treating nitrogen oxides, the problem of poor control effect on ammonia injection amount exists.
SUMMERY OF THE UTILITY MODEL
An object of the embodiment of the present application is to provide a flue gas denitration treatment system, the control effect of the ammonia injection amount in the nitrogen oxide treatment process can be improved.
In order to achieve the above object, an embodiment of the present application provides a flue gas denitration treatment system, including:
the device comprises a flue gas treatment flue, a detection device and a control device, wherein the flue gas treatment flue comprises an input end and an output end, and is provided with a detection hole;
the nitrogen oxide detection device is inserted into the detection hole, and the detection end of the nitrogen oxide detection device is positioned outside the flue gas treatment flue so as to detect the content of nitrogen oxide in the gas inside the flue gas treatment flue;
the reactor is positioned inside the flue gas treatment flue and is used for reacting nitrogen oxides inside the flue gas treatment flue with ammonia gas;
the ammonia spraying end of the ammonia spraying device is positioned inside the flue gas treatment flue, and the ammonia spraying device is positioned between the input end and the reactor;
and the control device is used for controlling the ammonia spraying device to spray ammonia based on the detection result of the nitrogen oxide detection device.
Optionally, the nitrogen oxide detection device comprises a shell, a nitrogen oxide sensor and a gas drainage piece, wherein the shell forms a detection chamber, a gas inlet is formed in the shell, and the gas inlet is communicated with the inside of the flue gas treatment flue;
the nitrogen oxide sensor with gas drainage piece respectively with the controlling means electricity is connected, just the nitrogen oxide sensor with gas drainage piece set up respectively in the detection chamber, the inlet end orientation of gas drainage piece gas inlet, with will gas introduction in the flue is handled to the flue gas the detection chamber.
Optionally, the detection holes include a first detection hole and a second detection hole, the nitrogen oxide detection device includes a first nitrogen oxide detection device and a second nitrogen oxide detection device, the first nitrogen oxide detection device is inserted into the first detection hole, the second nitrogen oxide detection device is inserted into the second detection hole, the first detection hole is close to the input end, the second detection hole is close to the output end, and along the extension direction of the flue gas treatment flue, the ammonia injection device and the reactor are respectively located between the first detection hole and the second detection hole;
the first nitrogen oxide detection device is used for detecting the content of the nitrogen oxide at the input end, the second nitrogen oxide detection device is used for detecting the content of the nitrogen oxide at the output end, and the control device is used for controlling the total ammonia injection amount of the ammonia injection device according to the content of the nitrogen oxide at the input end and the content of the nitrogen oxide at the output end.
Optionally, at least two second detection holes are formed in the side wall of the flue gas treatment flue, and at least two second oxynitride detection devices which correspond to the at least two second detection holes one by one are inserted into the side wall of the flue gas treatment flue;
the control device is used for determining the content of the nitrogen oxides at the output end according to the detection results of the at least two second nitrogen oxide detection devices.
Optionally, the at least two second nitrous oxide detection devices are arranged at intervals along the circumferential direction of the flue gas treatment flue, and the at least two second nitrous oxide detection devices divide the cross section of the flue gas treatment flue into at least two detection areas, wherein one second nitrous oxide detection device corresponds to one detection area;
the control device is used for determining the content of nitrogen oxides in the at least two detection areas according to the detection results of the two second nitrogen oxide detection devices, and the control device is further used for controlling the ammonia spraying amount of the ammonia spraying device to different areas in the flue gas treatment flue according to the content of nitrogen oxides in the at least two detection areas.
Optionally, the ammonia injection device comprises at least two ammonia injection grids, and the at least two ammonia injection grids are respectively arranged in a target section of the flue gas treatment flue, wherein one ammonia injection grid corresponds to one detection area;
the control device is used for spraying ammonia to different areas in the flue gas treatment flue based on the at least two ammonia spraying grids.
Optionally, the ammonia injection device further includes an ammonia gas supply pipeline, the ammonia gas supply pipeline includes a main pipeline and at least two branch pipelines, the at least two branch pipelines correspond to the at least two ammonia injection grills one to one, and the ammonia injection grills are communicated with the main pipeline through the corresponding branch pipelines;
the main pipeline is provided with a first control valve for controlling the opening and closing of an ammonia gas inlet of the main pipeline, and the branch pipeline is provided with a second control valve and a flowmeter;
the control device is used for controlling the total ammonia injection amount based on the first control valve, and the control device is also used for controlling the ammonia injection amount of the ammonia injection device to different areas in the flue gas treatment flue based on the second control valve and the flow meter.
Optionally, at least two first detection holes are formed in the side wall of the flue gas treatment flue, at least two first nitrogen oxide detection devices which are in one-to-one correspondence with the at least two first detection holes are inserted into the side wall of the flue gas treatment flue, and the at least two first detection holes are arranged at intervals along the circumferential direction of the flue gas treatment flue;
the control device is used for determining the content of the nitrogen oxides in the input end according to the detection results of the two first nitrogen oxide detection devices.
Optionally, the nitrogen oxide detection device further comprises a fault detection module, and a manual control valve is arranged on the branch pipeline;
when the control device receives a fault signal sent by the fault detection module, the control device switches the control mode of the ammonia spraying device from an automatic control mode to a manual control mode;
when the control mode is the automatic control mode, the control device controls the ammonia injection device based on the first nitrogen oxide detection device, the second nitrogen oxide detection device, the first control valve, the second control valve, and the flow meter;
and when the control mode is the manual control mode, the control device performs manual control on the ammonia spraying device based on the second control valve.
Optionally, the flue gas denitration treatment system further comprises a flow field adjusting device for adjusting a gas flow field in the flue gas treatment flue, wherein the flow field adjusting device is arranged in the flue gas treatment flue, and the flow field adjusting device is located between the ammonia injection device and the reactor.
In this embodiment, the nitrogen oxide content in the flue gas treatment flue is detected in real time by the nitrogen oxide detection device, so that the control device can quantitatively control the ammonia injection amount of the ammonia injection device based on the nitrogen oxide content, thereby improving the control effect of the ammonia injection amount. Simultaneously, because nitrogen oxide detection device can direct detection the inside nitrogen oxide content of flue gas treatment flue for need carry out steps such as flue gas sampling, sample gas transmission, sample gas preliminary treatment, sample gas analysis and data processing among the correlation technique, can improve the real-time of testing result to further improve the control effect to spouting ammonia volume.
It should be understood that the statements in this section do not necessarily identify key or critical features of the embodiments of the present application, nor do they limit the scope of the present application. Other features of the present application will become apparent from the following description.
Drawings
The drawings are included to provide a better understanding of the present solution and are not to be construed as limiting the present disclosure. Wherein:
FIG. 1 is a schematic structural diagram of a flue gas denitration treatment system provided by the present application;
FIG. 2 is a schematic structural diagram of an ammonia injection device in an embodiment of the present application;
FIG. 3 is a schematic view of a portion of the input end of a flue gas treatment stack according to an embodiment of the present disclosure;
FIG. 4 is a schematic view of a partial structure of an output end of a flue gas treatment stack according to an embodiment of the present disclosure;
fig. 5 is a second schematic structural diagram of a flue gas denitration treatment system provided by the present application.
Detailed Description
The following description of the exemplary embodiments of the present application, taken in conjunction with the accompanying drawings, includes various details of the embodiments of the application to assist in understanding, which are to be considered exemplary only. Accordingly, those of ordinary skill in the art will recognize that various changes and modifications of the embodiments described herein can be made without departing from the scope and spirit of the present application. Also, descriptions of well-known functions and constructions are omitted in the following description for clarity and conciseness.
Please refer to fig. 1 to 4, which are schematic structural diagrams of a flue gas denitration treatment system provided in an embodiment of the present application, the flue gas denitration treatment system includes:
the detection device comprises a flue gas treatment flue 100, wherein the flue gas treatment flue 100 comprises an input end 110 and an output end 120, and a detection hole is formed in the flue gas treatment flue 100;
the nitrogen oxide detection device 200 is inserted into the detection hole, and the detection end of the nitrogen oxide detection device 200 is positioned outside the flue gas treatment flue 100 so as to detect the content of nitrogen oxide in the gas inside the flue gas treatment flue 100;
a reactor 300, wherein the reactor 300 is located inside the flue gas treatment flue 100, and the reactor 300 is used for reacting nitrogen oxides inside the flue gas treatment flue 100 with ammonia gas;
an ammonia injection device 400, wherein an ammonia injection end of the ammonia injection device 400 is positioned inside the flue gas treatment flue 100, and the ammonia injection device 400 is positioned between the input end 110 and the reactor 300;
and a control device 500, wherein the nitrogen oxide detection device 200 and the ammonia injection device 400 are electrically connected to the control device 500, respectively, and the control device 500 is configured to control the ammonia injection device 400 to inject ammonia based on a detection result of the nitrogen oxide detection device 200.
Specifically, the input end 110 may be connected to a flue gas discharge port in a plant, and the output end 120 may be communicated with the outside, or the output end 120 may be connected to a chimney of the plant. Of course, the flue gas treatment stack 100 may also form the chimney.
The nitrogen oxide detection device 200 can be hermetically connected with the detection hole to prevent the flue gas in the flue gas treatment flue 100 from leaking through a gap between the nitrogen oxide detection device 200 and the detection hole. The nitrogen oxide detection device 200 may include a nitrogen oxide detection sensor commonly known in the art, wherein the nitrogen oxide detection sensor may form a detection end of the nitrogen oxide detection device 200 to detect the content of nitrogen oxide in the gas in the flue gas treatment flue 100. Specifically, the gas in the flue gas treatment flue 100 may be introduced into a nitrogen oxide detection sensor inside the nitrogen oxide detection device 200, so as to detect the content of nitrogen oxide in the flue gas. The reactor 300 may be a denitration reactor commonly used in the prior art, wherein the denitration reactor 300 may include a catalyst for catalyzing the reaction of nitrogen oxides with ammonia gas. Thus, when the nitrogen oxides and ammonia gas flow to the reactor 300, the reaction can be performed under the action of the catalyst to reduce the content of nitrogen oxides in the gas.
It is understood that the reactor 300 may be a reaction device which operates independently, when the reactor 300 is a reaction device which operates independently, there is no connection between the reactor 300 and the control device 500, and related personnel may periodically add substances which are consumed in the reaction process, such as a catalyst, into the reactor 300, so as to manage the reactor 300.
In addition, referring to fig. 5, in another embodiment of the present application, the reactor 300 may also be electrically connected to the control device 500, in which case, the relevant personnel may control the operating state of the reactor 300 based on the control device 500, and may manage the substances required to be consumed by the reactor 300 during the operation process based on the control device 500. In addition, the control device 500 may perform predetermined management of the characteristics of the reactor 300 based on the detection result of the nitrogen oxide detecting device 200, thereby further improving the management effect of the reactor 300.
The ammonia injection device 400 may include an ammonia gas production facility or an ammonia storage tank in which a large amount of ammonia gas is stored. In addition, the ammonia injection device 400 further comprises an ammonia injection grid 460 connected to the ammonia gas production facility or the ammonia storage tank, and the ammonia injection grid 460 is located in the flue gas treatment flue 100, so as to inject ammonia into the flue gas treatment flue 100 through the ammonia injection grid 460. The ammonia injection grid 460 may be located between the input end 110 and the reactor 300, so that the flue gas input from the input end 110 can drive the ammonia gas injected from the ammonia injection grid 460 to flow to the reactor 300, and the flue gas flowing to the reactor 300 and the ammonia gas can react in the reactor 300 under the action of a catalyst.
Referring to fig. 1, the control device 500 may include a denitration controller 510 and a DCS controller 520, wherein the denitration controller 510 is electrically connected to the DCS controller 520, the nitrogen oxide detection device 200, and the ammonia injection device 400, respectively. The denitration controller 510 is configured to receive a detection result of the nitrogen oxide detection apparatus 200, analyze characteristics such as content and distribution of various substances in the flue gas treatment flue 100, transmit the analysis result to the DCS controller 520, send a corresponding control instruction to the denitration controller 510 based on the analysis result, and control the ammonia injection apparatus 400 based on the control instruction by the denitration controller 510.
In the related art, when detecting the content of nitrogen oxides in flue gas, steps such as flue gas sampling, sample gas transmission, sample gas pretreatment, sample gas analysis, data processing and the like are usually required, and the process consumes relatively long time, so that the detection result is relatively delayed. This leads to a problem that the amount of ammonia injection cannot be controlled based on the real-time content of nitrogen oxides in the flue gas. Based on this, in the embodiment of the present application, the nitrogen oxide detection device 200 is inserted into the flue gas treatment flue 100 to detect the content of nitrogen oxide in the gas in the flue gas treatment flue 100 in real time, so that the real-time performance of the detection result can be improved.
In this embodiment, the content of nitrogen oxide in the flue gas treatment flue 100 is detected in real time by the nitrogen oxide detection device 200, so that the control device 500 can quantitatively control the ammonia injection amount of the ammonia injection device 400 based on the content of nitrogen oxide, thereby improving the control effect on the ammonia injection amount. Meanwhile, because the nitrogen oxide detection device 200 can directly detect the content of nitrogen oxide in the flue gas treatment flue 100, compared with the steps of flue gas sampling, sample gas transmission, sample gas pretreatment, sample gas analysis, data processing and the like in the related art, the real-time performance of the detection result can be improved, and the control effect on the ammonia injection amount is further improved.
Optionally, the nitrogen oxide detection device 200 includes a housing, a nitrogen oxide sensor, and a gas guide member, where the housing forms a detection chamber, and a gas inlet is formed on the housing, and the gas inlet is communicated with the inside of the flue gas treatment flue 100;
the nitrogen oxide sensor with gas drainage spare respectively with controlling means 500 electricity is connected, just the nitrogen oxide sensor with gas drainage spare set up respectively in detect the indoor, the inlet end orientation of gas drainage spare gas inlet to with gas introduction in the flue is handled to the flue gas detect the room.
Wherein the gas inlet of the housing can be located in the flue gas treatment flue 100 to draw flue gas at a specific location in the flue gas treatment flue 100 into the detection chamber for detection. The gas-guiding member may be a suction nozzle, for example, a suction nozzle of negative pressure type commonly known in the art, to suck the smoke in the smoke treatment flue 100 to the detection chamber.
In this embodiment, the flue gas in the flue gas treatment flue 100 is guided to the detection chamber, so that the nitrogen oxide sensor detects the content of nitrogen oxide in the flue gas entering the detection chamber.
Optionally, the detecting holes include a first detecting hole 130 and a second detecting hole 140, the nitrogen oxide detecting device 200 includes a first nitrogen oxide detecting device 210 and a second nitrogen oxide detecting device 220, the first nitrogen oxide detecting device 210 is inserted into the first detecting hole 130, the second nitrogen oxide detecting device 220 is inserted into the second detecting hole 140, the first detecting hole 130 is close to the input end 110, the second detecting hole 140 is close to the output end 120, and along the extending direction of the flue gas treatment flue 100, the ammonia injection device 400 and the reactor 300 are respectively located between the first detecting hole 130 and the second detecting hole 140;
wherein, the first nitrogen oxide detecting device 210 is used for detecting the nitrogen oxide content of the input terminal 110, the second nitrogen oxide detecting device 220 is used for detecting the nitrogen oxide content of the output terminal 120, and the control device 500 is used for controlling the total ammonia injection amount of the ammonia injection device 400 according to the nitrogen oxide content of the input terminal 110 and the nitrogen oxide content of the output terminal 120.
It is understood that the first nitrogen oxide detecting device 210 and the second nitrogen oxide detecting device 220 may have the same structure.
In this embodiment, can tentatively confirm the ammonia injection total amount through the nitrogen oxide content according to input 110, simultaneously, because the effect of nitrogen oxide content processing can be represented to the nitrogen oxide content of output 120, like this, combine output 120 nitrogen oxide content to generate feedback signal, adjust the ammonia injection total amount of tentatively confirming, can further improve the control effect to the ammonia injection volume.
Optionally, at least two second detection holes 140 are formed in the side wall of the flue gas treatment flue 100, and at least two second nitrogen oxide detection devices 220 corresponding to the at least two second detection holes 140 in one-to-one correspondence are inserted into the side wall of the flue gas treatment flue 100;
wherein the control device 500 is configured to determine the nox content of the output 120 according to the detection results of the at least two second nox detecting devices 220.
Specifically, the at least two second nitrogen oxide detecting devices 220 may be arranged at intervals, for example, may be arranged at equal intervals along the circumferential direction of the flue gas treatment flue 100, or may be arranged at intervals along the length direction of the flue gas treatment flue 100. The control device 500 may calculate an average value of the detection results of the at least two second nox detection devices 220 that detect nox, and determine a calculated average value determination value as the nox content of the output terminal 120. Therefore, compared with single-point detection, the method can avoid the problem of inaccurate detection result caused by higher or lower local nitrogen oxides, thereby being beneficial to further improving the accuracy of ammonia injection amount control.
The number of the second nitrous oxide detection devices 220 may be determined according to different application scenarios, and may be generally 4 to 12. For example: for a 300MW generator set, the number of the second nox detecting device 220 may be 4 to 6. For a 600MW power generating set, the number of the second nox detecting device 220 may be 6 to 8. For a 1000MW generator set, the number of the second nox detecting device 220 may be 8 to 12.
In an embodiment of the present application, the flue gas denitration treatment system may include 4 second nitrogen oxide detection devices 220, and if the detection results of the 4 second nitrogen oxide detection devices 220 for detecting nitrogen oxides are: A. b, C, D, the nox content of the output 120 can be expressed as: e = (a + B + C + D)/4.
Optionally, the at least two second nox detection devices 220 are arranged at intervals along the circumferential direction of the flue gas treatment flue 100, and the at least two second nox detection devices 220 divide the cross section of the flue gas treatment flue 100 into at least two detection zones, wherein one second nox detection device 220 corresponds to one detection zone;
the control device 500 is configured to determine the nitrogen oxide content of the at least two detection areas according to the detection results of the two second nitrogen oxide detection devices 220, and the control device 500 is further configured to control the ammonia injection amount of the ammonia injection device 400 to different areas in the flue gas treatment flue 100 according to the nitrogen oxide content of the at least two detection areas.
In this embodiment, the content of nitrogen oxides in different areas of the same cross section of the flue gas treatment flue 100 is detected by the second nitrogen oxide detection device 220 based on different differences, so that the ammonia injection amount in different areas can be respectively adjusted according to the content of nitrogen oxides in different areas of the flue gas treatment flue 100, and the problem of local excessive ammonia injection or local insufficient ammonia injection is avoided.
In one embodiment of the present application, the ammonia injection device 400 further comprises an ammonia gas supply pipeline, the ammonia gas supply pipeline comprises a main pipeline 410 and at least two branch pipelines 420, the at least two branch pipelines 420 correspond to the at least two ammonia injection grills 460 one by one, and the ammonia injection grills 460 are communicated with the main pipeline 410 through the corresponding branch pipelines 420;
a first control valve 470 for controlling the opening and closing of an ammonia gas inlet of the main pipeline 410 is arranged on the main pipeline 410, and a second control valve 440 and a flow meter 430 are arranged on the branch pipeline 420;
the control device 500 is used for controlling the total ammonia injection amount based on the first control valve 470, and the control device 500 is also used for controlling the ammonia injection amount of the ammonia injection device 400 to different areas in the flue gas treatment flue 100 based on the second control valve 440 and the flow meter 430.
Specifically, the ammonia injection grid 460 may include an ammonia injection pipe and an ammonia injection port opened on the ammonia injection pipe, and the ammonia injection pipe is communicated with the branch pipe 420, so that the ammonia gas flowing into the ammonia injection pipe may be injected into the flue gas treatment flue 100 through the ammonia injection port.
Referring to fig. 2, the main flue may also be in flow communication with a dilution air flue 700, and since the ammonia gas concentration entering the main flue is generally high, dilution air may be introduced into the main flue through the dilution air flue 700 to dilute the ammonia gas concentration to a safe concentration.
In this embodiment, when the total ammonia injection amount is determined, the opening degree of the first control valve 470 may be determined based on the total ammonia injection amount to control the total amount of ammonia gas entering the ammonia injection device 400. Meanwhile, since the flow meter 430 can measure the flow rate of the ammonia gas corresponding to the branch pipe 420, and the second control valve 440 can control the flow rate of the ammonia gas corresponding to the branch pipe 420, the flow rate of the ammonia gas in the corresponding branch pipe 420 can be adjusted based on the second control valve 440 and the flow meter 430, and thus the ammonia injection amount of each area can be controlled.
The ammonia injection amount of each region controlled by the ammonia injection device 400 may specifically be: the average nox content of the output terminal 120 is calculated based on the detection results of the at least two second nox detection devices 220, the total amount of ammonia injection is calculated based on the average nox content, then the total amount of ammonia injection is divided by the number of ammonia injection grilles 460 to obtain an initial value of the amount of ammonia injection for each zone, and when the amount of nox in a certain zone is higher than the average nox content, the amount of ammonia injection for that zone is increased based on the initial value. Correspondingly, when the nitrogen oxide content of a certain partition is lower than the average nitrogen oxide content, the ammonia injection amount of the partition is reduced on the basis of the initial value. Thereby realizing the process of spraying ammonia to different areas in the flue gas treatment flue 100.
It can be understood that, in the working process of the flue gas denitration treatment system, the nitrogen oxide detection device 200 of each region can detect the content of nitrogen oxide in the corresponding region in real time, and meanwhile, the control device 500 can dynamically adjust the ammonia injection amount of each region according to the detection result of the nitrogen oxide detection device 200. Adopt among the prior art regularly to sample and detect the flue gas to realize regularly carrying out the technical scheme who adjusts to spouting ammonia volume, adopt the technical scheme of this application can realize carrying out real-time regulation to spouting ammonia volume to each subregion based on the real-time condition of nitrogen oxide in flue gas treatment flue 100, thereby can further improve the treatment effect of flue gas denitration processing system to the flue gas.
Optionally, at least two first detection holes 130 are formed in the side wall of the flue gas treatment flue 100, at least two first nitrogen oxide detection devices 210 corresponding to the at least two first detection holes 130 in a one-to-one manner are inserted into the side wall of the flue gas treatment flue 100, and the at least two first detection holes 130 are arranged at intervals along the circumferential direction of the flue gas treatment flue 100;
the control device 500 is configured to determine the nox content of the input terminal 110 according to the detection results of the two first nox detecting devices 210.
In this embodiment, the control device 500 may calculate an average value of the detection results of the at least two first nitrogen oxide detection devices 210 for detecting nitrogen oxides, and determine the calculated average value as the nitrogen oxide content of the input terminal 110. Therefore, compared with single-point detection, the method can avoid the problem of inaccurate detection result caused by higher or lower local nitrogen oxides, thereby being beneficial to further improving the accuracy of ammonia injection amount control.
Optionally, the nitrogen oxide detection apparatus 200 further includes a fault detection module, and the branch pipeline 420 is provided with a manual control valve 450;
when the control device 500 receives the fault signal sent by the fault detection module, the control device 500 switches the control mode of the ammonia spraying device 400 from the automatic control mode to the manual control mode;
in the case where the control mode is the automatic control mode, the control device 500 controls the ammonia injection device 400 based on the first nitrogen oxide detection device 210, the second nitrogen oxide detection device 220, the first control valve 470, the second control valve 440, and the flow meter 430;
when the control mode is the manual control mode, the control device manually controls the ammonia injection device 400 based on the second control valve 440.
In this embodiment, an automatic control mode and a manual control mode are set, and when the nitrogen oxide detection device 200 fails, the mode is automatically switched to the manual control mode, so that when the nitrogen oxide detection device 200 fails, a relevant person can manually control the ammonia injection amount 400 of each partition based on the second control valve 440, and thus, when a system fails, the ammonia injection amount can be controlled.
Optionally, the flue gas denitration treatment system further includes a flow field adjusting device 600 for adjusting a gas flow field in the flue gas treatment flue 100, the flow field adjusting device 600 is disposed inside the flue gas treatment flue 100, and the flow field adjusting device 600 is located between the ammonia injection device 400 and the reactor 300.
Specifically, since the maximum deviation of the gas flow velocity distribution is allowed to be 15% in the inlet cross section at the top of the reactor 300, if the difference of the gas flow velocities at different positions on the same cross section exceeds 15%, the reaction effect will be deteriorated. Based on this, in the embodiment of the present application, the flow field adjusting device 600 is disposed between the ammonia injection device 400 and the reactor 300 to adjust the flow rates of different areas in the flue gas treatment flue 100, so as to reduce the gas flow velocity difference on the top inlet cross section of the reactor 300, thereby improving the reaction effect.
The flow field adjusting device 600 may include a flow guide plate and/or a flow equalizing plate. For example, a flow equalizing plate can be disposed on one of the cross sections of the flue gas treatment flue 100, and the flow equalizing plate comprises a plate body and flow equalizing holes uniformly distributed on the surface of the plate body, so that the flow of flue gas in each area is relatively equalized after flowing through the flow equalizing plate.
In one embodiment of the present application, the flow field distribution of the flue gas treatment flue 100 may be simulated by CFD software, and based on the simulation result, a flow guide plate and/or a flow equalizing plate may be added in the flue gas treatment flue 100, so that the flow field flow rate deviation at the inlet of the reactor 300 is less than 15%. The specific positions and the specific postures of the flow guide plate and the flow equalizing plate can be determined according to a simulation result, and are not limited herein.
Referring to fig. 1, in an embodiment of the present application, an economizer 800 is further disposed in the flue gas treatment flue 100, wherein the economizer 800 may be a common heat exchanger, and cooling water may be introduced into the economizer 800, so that when high-temperature flue gas in the flue gas treatment flue 100 flows through the economizer 800, the cooling water in the economizer 800 may be heated, so as to achieve an effect of recovering heat in the flue gas through the economizer 800, thereby improving utilization rate of energy.
The above-described embodiments should not be construed as limiting the scope of the present application. It will be apparent to those skilled in the art that various modifications, combinations, sub-combinations, and substitutions can be made in accordance with design requirements and other factors. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (9)
1. A flue gas denitration treatment system, characterized by comprising:
the device comprises a flue gas treatment flue (100), wherein the flue gas treatment flue (100) comprises an input end (110) and an output end (120), and a detection hole is formed in the flue gas treatment flue (100);
the nitrogen oxide detection device (200) is inserted into the detection hole, and the detection end of the nitrogen oxide detection device (200) is positioned outside the flue gas treatment flue (100) so as to detect the content of the nitrogen oxide in the gas inside the flue gas treatment flue (100);
a reactor (300), wherein the reactor (300) is positioned inside the flue gas treatment flue (100), and the reactor (300) is used for reacting nitrogen oxides inside the flue gas treatment flue (100) with ammonia gas;
an ammonia injection device (400), wherein an ammonia injection end of the ammonia injection device (400) is positioned inside the flue gas treatment flue (100), and the ammonia injection device (400) is positioned between the input end (110) and the reactor (300);
and the control device (500), the nitrogen oxide detection device (200) and the ammonia injection device (400) are respectively electrically connected with the control device (500).
2. The flue gas denitration treatment system according to claim 1, wherein the nitrogen oxide detection device (200) comprises a housing, a nitrogen oxide sensor and a gas guide member, the housing forms a detection chamber, and a gas inlet is formed on the housing and communicated with the interior of the flue gas treatment flue (100);
the nitrogen oxide sensor with gas drainage spare respectively with controlling means (500) electricity is connected, just the nitrogen oxide sensor with gas drainage spare set up respectively in detect the indoor, the inlet end orientation of gas drainage spare gas inlet to with gas introduction in flue (100) is handled to the flue gas detect the room.
3. The system of claim 1, wherein the detection holes comprise a first detection hole (130) and a second detection hole (140), the nitrogen oxide detection device (200) comprises a first nitrogen oxide detection device (210) and a second nitrogen oxide detection device (220), the first nitrogen oxide detection device (210) is inserted into the first detection hole (130), the second nitrogen oxide detection device (220) is inserted into the second detection hole (140), the first detection hole (130) is close to the input end (110), the second detection hole (140) is close to the output end (120), and the ammonia injection device (400) and the reactor (300) are respectively located between the first detection hole (130) and the second detection hole (140) along the extending direction of the flue gas treatment flue (100);
the first nitrogen oxide detection device (210) is used for detecting the nitrogen oxide content of the input end (110), and the second nitrogen oxide detection device (220) is used for detecting the nitrogen oxide content of the output end (120).
4. The flue gas denitration treatment system according to claim 3, wherein at least two second detection holes (140) are formed in the side wall of the flue gas treatment flue (100), and at least two second oxynitride detection devices (220) corresponding to the at least two second detection holes (140) in a one-to-one manner are inserted into the side wall of the flue gas treatment flue (100).
5. The flue gas denitration treatment system according to claim 4, wherein the at least two second nitrogen oxide detection devices (220) are arranged at intervals along the circumferential direction of the flue gas treatment flue (100), and the at least two second nitrogen oxide detection devices (220) divide the cross section of the flue gas treatment flue (100) into at least two detection zones, wherein one second nitrogen oxide detection device (220) corresponds to one detection zone.
6. The flue gas denitration treatment system of claim 5, wherein the ammonia injection device (400) comprises at least two ammonia injection grids (460), and the at least two ammonia injection grids (460) are respectively arranged in a target section of the flue gas treatment flue (100), wherein one ammonia injection grid (460) corresponds to one detection area.
7. The flue gas denitration treatment system according to claim 6, wherein the ammonia injection device (400) further comprises an ammonia gas supply pipeline, the ammonia gas supply pipeline comprises a main pipeline (410) and at least two branch pipelines (420), the at least two branch pipelines (420) correspond to the at least two ammonia injection grills (460) in a one-to-one manner, and the ammonia injection grills (460) are communicated with the main pipeline (410) through the corresponding branch pipelines (420);
the main pipeline (410) is provided with a first control valve (470) for controlling the opening and closing of an ammonia gas inlet of the main pipeline (410), and the branch pipeline (420) is provided with a second control valve (440) and a flow meter (430).
8. The flue gas denitration treatment system of claim 3, wherein at least two first detection holes (130) are formed in the side wall of the flue gas treatment flue (100), at least two first nitrogen oxide detection devices (210) corresponding to the at least two first detection holes (130) in a one-to-one manner are inserted into the side wall of the flue gas treatment flue (100), and the at least two first detection holes (130) are arranged at intervals along the circumferential direction of the flue gas treatment flue (100).
9. The flue gas denitration treatment system according to any one of claims 1 to 8, further comprising a flow field adjusting device (600) for adjusting a gas flow field in the flue gas treatment flue (100), wherein the flow field adjusting device (600) is disposed inside the flue gas treatment flue (100), and the flow field adjusting device (600) is located between the ammonia injection device (400) and the reactor (300).
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| CN114452801A (en) * | 2022-03-18 | 2022-05-10 | 山东创宇环保科技有限公司 | Flue gas denitration treatment system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114452801A (en) * | 2022-03-18 | 2022-05-10 | 山东创宇环保科技有限公司 | Flue gas denitration treatment system |
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