CN204865547U - A control system for flue gas denitration of power plant - Google Patents
A control system for flue gas denitration of power plant Download PDFInfo
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- CN204865547U CN204865547U CN201520646118.1U CN201520646118U CN204865547U CN 204865547 U CN204865547 U CN 204865547U CN 201520646118 U CN201520646118 U CN 201520646118U CN 204865547 U CN204865547 U CN 204865547U
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- flue gas
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Abstract
The utility model discloses a control system for flue gas denitration of power plant who belongs to the flue gas denitrification technology field. Its governing valve, flowmeter, thermocouple, NOX concentration monitor, ammonia escape concentration detection appearance and boiler load monitoring devices all link to each other with the controller, are equipped with the choke flow distribution plate in the flue of the flue gas denitration of power plant device, and chimney outlet department is equipped with ammonia absorbing device. The utility model discloses a control system adopts the PLC controller, and control is convenient, and the accuracy is reliable, short response time, and the speed that the choke flow distribution plate of setting can make the flue gas flow out is even, simultaneously, can thoroughly get rid of NOX, and terminal ammonia absorbing device can get rid of a small amount of ammonia of escaping in the reaction for the gas of atmospheric dilution does not contain any gaseous pollutants.
Description
Technical field
The utility model belongs to gas denitrifying technology field, is specifically related to a kind of control system for power-plant flue gas denitration.
Background technology
In the electricity generation system taking coal gas as main power generation energy resource, NO and NO can be produced
2, being atmosphere pollution, is acid rain, the factor that PM2.5 is formed, and industrial in order to environmental protection, the process removed is the denitration of flue gas, and the denitration of flue gas mainly adopts selective catalytic reduction at present, uses liquefied ammonia as reducing agent, finally generates N
2and water, be discharged in air and go, in the operating process of reality, need the amount automatically controlling to add liquefied ammonia, need electric control system, in electric control system, the general DCS that adopts controls, and its principle controlled is for detecting NO
xconcentration, the injected volume of liquefied ammonia is increased when concentration is large, concentration hour reduces the injected volume of liquefied ammonia, but, because chemical reaction has response delay, this kind of method is adopted to control, accuracy is too low, and removal effect is not obvious, if liquefied ammonia amount adds larger, liquefied ammonia also can be caused to escape, cause secondary pollution.
Even if adopt perfect control program, still NO and NO can not be removed completely
2,also the control of carrying out discharging is needed, also not good control NO and NO in current denitrification apparatus at terminal drainage mouth
2the control system of not discharging completely and device.
Patent 201120306511.8 discloses a kind of reducing agent ejection control device of flue gas denitrification system, and the application of this device can than NO and NO removed more completely in flue gas
2,but, can not remove completely, and have a small amount of liquefied ammonia to escape.
Utility model content
For the defect of prior art, the utility model proposes a kind of control system for power-plant flue gas denitration.
For a control system for power-plant flue gas denitrification apparatus, control valve, flowmeter, thermocouple, NO
xconcentration monitor, ammonia slip concentration detector is all connected with controller with boiler load monitoring device; Boiler load monitoring device, controller and control valve form reducing agent and spray feedforward control system, the boiler load signal that boiler load monitoring device exports and cross oxygen signal sprays feedforward control system input signal as reducing agent; NO
xconcentration monitor, thermocouple, controller and control valve form reducing agent and spray feedback control system, are provided with choke flow distribution plate in the flue of described power-plant flue gas denitrification apparatus; The chimney outlet of described power-plant flue gas denitrification apparatus is provided with ammonia absorption device.
Described choke flow distribution plate scribbles catalyst.
Described choke flow distribution plate is the disk of polylith with round sieve; The aperture of described round sieve increases from inside to outside gradually, and the aperture of first lap sieve aperture is 0.1mm, and interval 3mm arranges next circle round sieve, and the diameter of round sieve increases 0.2mm.
Described choke flow distribution plate is the arc-like sheet of polylith with round sieve, flare shape; The cross-sectional shapes of described arc-like sheet is parabola; The aperture of described round sieve increases from inside to outside gradually, and the aperture of first lap sieve aperture is 0.2mm, and interval 5mm arranges next circle round sieve, and the diameter of round sieve increases 0.2mm.
Described ammonia absorption device is mol sieve reactors; The aperture of described mol sieve reactors is 4.0 Ethylmercurichlorendimides.
Described ammonia absorption device is active carbon.
Compared with prior art, the utility model has following beneficial effect: control system of the present utility model adopts PLC, and it is convenient to control, accurately, reliably, the response time is short, the rate uniform that the choke flow distribution plate arranged can make flue gas flow out, meanwhile, thoroughly can remove NO
x, the ammonia absorption device of end can remove a small amount of ammonia of escaping in reaction, makes the gas entering air not containing any dusty gas.
Accompanying drawing explanation
Fig. 1 is the Control system architecture schematic diagram of the utility model for power-plant flue gas denitrification apparatus;
Fig. 2 is the structural representation of choke flow distribution plate;
Fig. 3 is another structural representation of choke flow distribution plate;
1-control valve, 2-flowmeter, 3-thermocouple, 4-spray gun, 5-NO
xconcentration monitor, 6-ammonia slip concentration detector, 7-boiler load monitoring device, 8-controller, 9-choke flow distribution plate, 10-flue, 11-ammonia absorption device.
Detailed description of the invention
Below in conjunction with accompanying drawing, detailed description of the invention of the present utility model is described in detail, but is to be understood that protection scope of the present invention not by the restriction of detailed description of the invention.
For a control system for power-plant flue gas denitrification apparatus, as shown in Figure 1, control valve 1, flowmeter 2, thermocouple 3, NO
xconcentration monitor 5, ammonia slip concentration detector 6 is all connected with controller 8 with boiler load monitoring device 7; Boiler load monitoring device 7, controller 8 and control valve 1 form reducing agent and spray feedforward control system, the boiler load signal that boiler load monitoring device 7 exports and cross oxygen signal and spray the input signal of feedforward control system as reducing agent; NO
xconcentration monitor 5, thermocouple 3, controller 8 and control valve 1 form reducing agent and spray feedback control system.The bottom of described thermocouple 3 is provided with spray gun 4; Described controller 8 is PLC.
NO
xthe concentration current signal that records 22 milliamperes by nitrous oxides concentration detector send into PLC analog quantity channel and convert and obtain; Amount of ammonia slip records the conversion of 20 milliamperes of current signals feeding PLC analog quantity channels by ammonia slip concentration detector and obtains; The signal that temperature is recorded by thermocouple or Special temperature measurement instrument is sent into the conversion of PLC analog quantity channel and is obtained; Control valve adopts the mode of 16 milliamperes of analog quantity regulation and control to carry out the aperture of by-pass valve control to control the consumption of reducing agent.
Choke flow distribution plate 9 is provided with in the flue 10 of described power-plant flue gas denitrification apparatus; Choke flow distribution plate 9 scribbles catalyst, described catalyst energy catalyzing N O
xthe reaction of nitrogen and water is generated, as CuO/ γ-Al with ammonia react
2o
3catalyst; Described choke flow distribution plate has delay air-flow through-rate, increases the effect of reaction chance, also has shunting, make the effect of gas outlet uniform stream.Because the air-flow velocity degree in the middle part of flue is larger, in order to make the air-flow rate of outflow even, inventor, by repeatedly testing, finds to arrange the mesh screen structure increasing mesh size from inside to outside gradually, can address this problem.
As shown in Figure 2, be a kind of structure of choke flow distribution plate 9, for polylith is with the disk of round sieve; The aperture of described round sieve increases from inside to outside gradually, and the aperture of first lap sieve aperture is 0.1mm, and interval 3mm arranges next circle round sieve, and the diameter of round sieve increases 0.2mm.
As shown in Figure 3, be the another kind of structure of choke flow distribution plate 9, described choke flow distribution plate 9 is the arc-like sheet of polylith with round sieve, flare shape; The cross-sectional shapes of described arc-like sheet is parabola; The aperture of described round sieve increases from inside to outside gradually, and the aperture of first lap sieve aperture is 0.2mm, and interval 5mm arranges next circle round sieve, and the diameter of round sieve increases 0.2mm.
The chimney outlet of described power-plant flue gas denitrification apparatus is provided with ammonia absorption device 11;
Preferred described ammonia absorption device 11 is mol sieve reactors; The aperture of described mol sieve reactors is 4.0 Ethylmercurichlorendimides.
Another kind of embodiment, described ammonia absorption device 11 is active carbon.
Be only specific embodiment of the utility model above, but the present invention is not limited thereto, the changes that any person skilled in the art can think of all should fall into protection scope of the present invention.
Claims (6)
1. for a control system for power-plant flue gas denitrification apparatus, control valve, flowmeter, thermocouple, NO
xconcentration monitor, ammonia slip concentration detector is all connected with controller with boiler load monitoring device; Boiler load monitoring device, controller and control valve form reducing agent and spray feedforward control system, the boiler load signal that boiler load monitoring device exports and cross oxygen signal sprays feedforward control system input signal as reducing agent; NO
xconcentration monitor, thermocouple, controller and control valve form reducing agent and spray feedback control system, it is characterized in that, are provided with choke flow distribution plate in the flue of described power-plant flue gas denitrification apparatus; The chimney outlet of described power-plant flue gas denitrification apparatus is provided with ammonia absorption device.
2. a kind of control system for power-plant flue gas denitrification apparatus according to claim 1, is characterized in that, described choke flow distribution plate scribbles catalyst.
3. a kind of control system for power-plant flue gas denitrification apparatus according to claim 1, it is characterized in that, described choke flow distribution plate is the disk of polylith with round sieve; The aperture of described round sieve increases from inside to outside gradually, and the aperture of first lap sieve aperture is 0.1mm, and interval 3mm arranges next circle round sieve, and the diameter of round sieve increases 0.2mm.
4. a kind of control system for power-plant flue gas denitrification apparatus according to claim 1, it is characterized in that, it is characterized in that, described choke flow distribution plate is the arc-like sheet of polylith with round sieve, flare shape; The cross-sectional shapes of described arc-like sheet is parabola; The aperture of described round sieve increases from inside to outside gradually, and the aperture of first lap sieve aperture is 0.2mm, and interval 5mm arranges next circle round sieve, and the diameter of round sieve increases 0.2mm.
5. a kind of control system for power-plant flue gas denitrification apparatus according to claim 1, it is characterized in that, it is characterized in that, described ammonia absorption device is mol sieve reactors; The aperture of described mol sieve reactors is 4.0 Ethylmercurichlorendimides.
6. a kind of control system for power-plant flue gas denitrification apparatus according to claim 1, it is characterized in that, it is characterized in that, described ammonia absorption device is active carbon.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520646118.1U CN204865547U (en) | 2015-08-25 | 2015-08-25 | A control system for flue gas denitration of power plant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520646118.1U CN204865547U (en) | 2015-08-25 | 2015-08-25 | A control system for flue gas denitration of power plant |
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| CN204865547U true CN204865547U (en) | 2015-12-16 |
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| CN201520646118.1U Expired - Fee Related CN204865547U (en) | 2015-08-25 | 2015-08-25 | A control system for flue gas denitration of power plant |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107486012A (en) * | 2017-09-27 | 2017-12-19 | 北京京桥热电有限责任公司 | A kind of denitrating flue gas control method |
| CN110263452A (en) * | 2019-06-25 | 2019-09-20 | 华电国际电力股份有限公司技术服务分公司 | Flue gas Annual distribution characteristic analysis method, system and denitrating system in a kind of flue |
-
2015
- 2015-08-25 CN CN201520646118.1U patent/CN204865547U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107486012A (en) * | 2017-09-27 | 2017-12-19 | 北京京桥热电有限责任公司 | A kind of denitrating flue gas control method |
| CN110263452A (en) * | 2019-06-25 | 2019-09-20 | 华电国际电力股份有限公司技术服务分公司 | Flue gas Annual distribution characteristic analysis method, system and denitrating system in a kind of flue |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20151216 Termination date: 20160825 |