CN210786833U - SNCR denitration automatic control system - Google Patents
SNCR denitration automatic control system Download PDFInfo
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- CN210786833U CN210786833U CN201822226486.7U CN201822226486U CN210786833U CN 210786833 U CN210786833 U CN 210786833U CN 201822226486 U CN201822226486 U CN 201822226486U CN 210786833 U CN210786833 U CN 210786833U
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Abstract
The utility model relates to a denitration treatment technical field specifically is a SNCR denitration automatic control system. The utility model provides a SNCR denitration automatic control system, includes the control unit, alarm unit, sprays unit, storage unit, conveying unit, the control unit includes controller, human-computer interaction interface, the control unit with alarm unit, conveying unit electricity are connected, conveying unit includes delivery pump, pipeline, conveying unit UNICOM spray the unit with storage unit. Realize automatic control and carry aqueous ammonia, dilution water, compressed air flow, spray the denitration by the aqueous ammonia after spraying the unit and will dilute again, accessible human-computer interaction interface realizes remote control, effectively uses manpower sparingly, realizes the automatic control process.
Description
Technical Field
The utility model relates to a denitration treatment technical field specifically is a SNCR denitration automatic control system.
Background
The SNCR (selective non-catalytic reduction) denitration process has the advantages of low investment, small occupied area and suitability for small-sized kiln denitration modification projects, but the knowledge level of operators is uneven, the SNCR denitration system has ammonia spraying excess in the operation process, the ammonia escape rate is high, the denitration efficiency is low, problems cannot be solved, the operation cost is high, and the enterprise profit is reduced. If can further improve SNCR deNOx systems automation, it will possess good market prospect in circulating fluidized bed boiler, cement kiln, waste incinerator denitration transformation field.
The key point of the SNCR denitration control system is to control three quantities of ammonia water, dilution water and compressed air, and after the three physical quantities are reasonably configured, the denitration efficiency can be effectively improved, and the operating cost is reduced. At present, SNCR denitration control systems widely adopted are all that operating personnel adjust aqueous ammonia electric regulating valve and dilution water electric regulating valve according to the NOx reduced value of export, and some operating personnel only adjust the volume of aqueous ammonia, and when standard after, also can not adjust, and when boiler operation condition changes the back, will cause to spout the aqueous ammonia and waste to a great extent raw materials, only when adjusting through export NOx reduced value, have the problem of regulation hysteresis, cause the standard exceeding easily.
SUMMERY OF THE UTILITY MODEL
In view of the not enough and defect that exists among the prior art, the utility model aims to provide a SNCR denitration automatic control system can realize the high efficiency denitration by online automatically regulated control aqueous ammonia, dilution water, compressed air flow, uses manpower sparingly, practices thrift the cost.
In order to solve the technical problem, the utility model discloses a following technical scheme: the utility model provides a SNCR denitration automatic control system, includes the control unit, alarm unit, sprays unit, storage unit, conveying unit, the control unit includes controller, human-computer interaction interface, the control unit with alarm unit, conveying unit electricity are connected, conveying unit includes delivery pump, pipeline, conveying unit UNICOM spray the unit with storage unit. Realize automatic control and carry aqueous ammonia, dilution water, compressed air flow, spray the denitration by the aqueous ammonia after spraying the unit and will dilute again, accessible human-computer interaction interface realizes remote control, effectively uses manpower sparingly, realizes the automatic control process.
The control unit also comprises a control system, a cloud system and a CEMS flue gas online monitoring system. And real-time online monitoring and remote control are realized.
The alarm unit comprises a field alarm system and a remote alarm system, the field alarm system comprises a warning lamp and an alarm, and the remote alarm system is in electric signal connection with the human-computer interaction interface. The unmanned monitoring, automatic monitoring and automatic early warning process is realized, and the occurrence of dangerous accidents is effectively avoided.
The conveying pipeline comprises a compressed air conveying pipeline, an ammonia water conveying pipeline and a dilution water conveying pipeline, and the conveying pump is arranged on the ammonia water conveying pipeline. The ammonia water, the dilution water and the compressed air are conveyed independently, so that the flow can be adjusted and controlled independently, and the proportion control is more accurate.
The injection unit includes spray gun, pressure transmitter, compressed air governing valve, dilution water electrical control valve, aqueous ammonia electrical control valve, compressed air pipeline, aqueous ammonia pipeline, dilution water pipeline respectively with the spray gun intercommunication, compressed air governing valve, dilution water electrical control valve, aqueous ammonia electrical control valve set up respectively in on compressed air pipeline, the dilution water pipeline, on the aqueous ammonia pipeline, pressure transmitter set up respectively in on compressed air pipeline, the dilution water pipeline, on the aqueous ammonia pipeline. The pressure transmitter can transmit a pressure signal to the control system in time, the control system acts on the controller, and the controller further controls the flow of the compressed air regulating valve, the dilution water electric regulating valve and the ammonia water electric regulating valve.
Compared with the prior art, the utility model discloses the beneficial effect who has does:
1. the utility model discloses can realize online monitoring, the automatic control process is effectively used manpower sparingly, practices thrift the cost.
2. The utility model discloses remote control process is realized to accessible human-computer interface, and simultaneously when dangerous, alarm unit in time sends alarm signal, and the scene can be in time controlled, has avoided dangerous emergence and has stretched.
3. The utility model discloses well CEMS flue gas on-line monitoring system can realize flue gas on-line monitoring to give control system with the signal transmission, through analysis processes after the control controller again by controller control compressed air governing valve, dilution water electric regulating valve, aqueous ammonia electric regulating valve carry different flow compressed air, dilution water and aqueous ammonia as required, realize high efficiency, no waste denitration process.
Drawings
The invention will be further described with reference to the accompanying drawings and specific embodiments:
fig. 1 is a schematic structural diagram of the present invention.
In the figure: 1. the system comprises a storage tank, 2, a control unit, 3, a conveying unit, 4, a conveying pump, 5, a CEMS, 6, a control system, 7, a controller, 8, an alarm unit, 9, a human-computer interaction interface, 10, a cloud system, 11, a dilution water conveying pipeline, 12, an ammonia water conveying pipeline, 13, a compressed air conveying pipeline, 14, a spray gun, 15, a compressed air regulating valve, 16, a dilution water electric regulating valve, 17, an ammonia water electric regulating valve, 18 and a pressure transmitter.
It is noted that in the description of the present invention, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Detailed Description
In order to make the technical solution and the advantages of the present invention more clear, the present invention will be further described in detail with reference to the accompanying drawings and the specific embodiments,
as shown in figure 1, an SNCR denitration automatic control system comprises a control unit 2, an alarm unit 8, an injection unit, a storage tank 1 and a conveying unit 3, wherein the control unit 2 comprises a controller 7 and a human-computer interaction interface 9, the control unit 2 is electrically connected with the alarm unit 8 and the conveying unit 3, the conveying unit 3 comprises a conveying pump 4 and a conveying pipeline, the conveying unit 3 is communicated with the injection unit and the storage tank 1, the control unit 2 further comprises a control system 6, a cloud system 10 and a CEMS flue gas online monitoring system 5, the alarm unit 8 comprises a field alarm system and a remote alarm system, the field alarm system comprises a warning lamp and a warning indicator, the remote alarm system is in electrical signal connection with the human-computer interaction interface 9, and the conveying pipeline comprises a compressed air conveying pipeline 13, an ammonia water conveying pipeline 12, a compressed air conveying pipeline 12, a nitrogen gas conveying pipeline 3, Dilution water pipeline 11, delivery pump 4 set up in on the aqueous ammonia pipeline 12, injection system includes spray gun 14, pressure transmitter 18, compressed air governing valve 15, dilution water electrical control valve 16, aqueous ammonia electrical control valve 17, compressed air pipeline 13, aqueous ammonia pipeline 12, dilution water pipeline 11 respectively with spray gun 14 intercommunication, compressed air governing valve 15, dilution water electrical control valve 16, aqueous ammonia electrical control valve 17 set up respectively in on compressed air pipeline 13, the dilution water pipeline 11, the aqueous ammonia pipeline 12, pressure transmitter set up respectively in on compressed air pipeline 13, the dilution water pipeline 11, the aqueous ammonia pipeline 12.
The utility model discloses during the implementation, at first set for one and discharge concentration value, the system can adopt to meet the limit and weaken integral PID control algorithm, carries out feedforward control according to the temperature that NOx concentration, oxygen content, flue gas volume, the reaction of SNCR entry need and adjusts, and 5 on-line monitoring NOx concentration of rethread export CEMS flue gas on-line monitoring system, oxygen content value carry out closed loop feedback control and adjust.
The method comprises the steps of firstly, feedforward control adjustment, smoke gas amount, oxygen content, NOx original concentration and denitration efficiency, automatically analyzing corresponding values from a cloud system 10 according to a previous operation data system, then transmitting information to a control system, controlling opening and closing of a compressed air adjusting valve 15, a dilution water electric adjusting valve 16 and an ammonia water electric adjusting valve 17 by the control system through a controller, increasing the ammonia water electric adjusting valve 17 if the original values are increased, reducing the dilution water electric adjusting valve 16, increasing the concentration of mixed ammonia water under the condition of ensuring that the total amount is not changed, or simultaneously increasing the flow of the ammonia water and dilution water, further increasing the flow of each spray gun, and simultaneously adjusting the pressure and the flow of corresponding compressed air according to the ammonia water pressure of each spray gun.
Then closed loop feedback control adjustment is carried out, and the flow adjustment is further controlled by the control unit 2 by adopting a meet limit weakening integral PID (proportion integration differentiation) adjustment algorithm according to the oxygen content and the NOx original concentration at the outlet. This the utility model discloses go back the accessible human-computer interaction interface 9 and carry out long-range on-line monitoring and control, can in time discover the problem of operation in-process and in time control the adjustment, can realize alone controlling a plurality of devices, effectively use manpower sparingly.
It should be understood that the detailed description and specific examples, while indicating the invention, are given by way of illustration only, not by way of limitation, since other embodiments will become apparent to those skilled in the art upon consideration of the following detailed description of the invention without any creative effort.
Claims (4)
1. The utility model provides a SNCR denitration automatic control system, its characterized in that, includes the control unit, alarm unit, sprays unit, storage unit, conveying unit, the control unit includes controller, human-computer interaction interface, the control unit with alarm unit, conveying unit electricity are connected, conveying unit includes delivery pump, pipeline, the conveying unit intercommunication spray the unit with storage unit, pipeline includes compressed air pipeline, aqueous ammonia pipeline, dilution water pipeline, the delivery pump set up in on the aqueous ammonia pipeline.
2. The SNCR denitration automatic control system of claim 1, wherein the control unit further comprises a control system, a cloud system, and a CEMS flue gas on-line monitoring system.
3. The SNCR denitration automatic control system of claim 1, wherein the alarm unit comprises a field alarm system and a remote alarm system, the field alarm system comprises a warning lamp and a warning indicator, and the remote alarm system is in electrical signal connection with the human-computer interaction interface.
4. The SNCR denitration automatic control system of claim 1, wherein the injection unit comprises a spray gun, a pressure transmitter, a compressed air regulating valve, a dilution water electric regulating valve and an ammonia water electric regulating valve, the compressed air conveying pipeline, the ammonia water conveying pipeline and the dilution water conveying pipeline are respectively communicated with the spray gun, the compressed air regulating valve, the dilution water electric regulating valve and the ammonia water electric regulating valve are respectively arranged on the compressed air conveying pipeline, the dilution water conveying pipeline and the ammonia water conveying pipeline, and the pressure transmitter is respectively arranged on the compressed air conveying pipeline, the dilution water conveying pipeline and the ammonia water conveying pipeline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822226486.7U CN210786833U (en) | 2018-12-27 | 2018-12-27 | SNCR denitration automatic control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822226486.7U CN210786833U (en) | 2018-12-27 | 2018-12-27 | SNCR denitration automatic control system |
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| Publication Number | Publication Date |
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| CN210786833U true CN210786833U (en) | 2020-06-19 |
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| CN201822226486.7U Active CN210786833U (en) | 2018-12-27 | 2018-12-27 | SNCR denitration automatic control system |
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| CN (1) | CN210786833U (en) |
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