CN204063081U - The flue structure that a kind of SCR flue gas denitrification system inlet flue gas temperature is adjustable - Google Patents
The flue structure that a kind of SCR flue gas denitrification system inlet flue gas temperature is adjustable Download PDFInfo
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- CN204063081U CN204063081U CN201420182708.9U CN201420182708U CN204063081U CN 204063081 U CN204063081 U CN 204063081U CN 201420182708 U CN201420182708 U CN 201420182708U CN 204063081 U CN204063081 U CN 204063081U
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- flue gas
- flue
- economizer
- scr
- straight channel
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 85
- 239000003546 flue gas Substances 0.000 title claims abstract description 85
- 239000007789 gas Substances 0.000 claims abstract description 28
- 238000009529 body temperature measurement Methods 0.000 claims abstract description 11
- 230000007246 mechanism Effects 0.000 claims abstract description 8
- 238000005452 bending Methods 0.000 claims abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 abstract description 12
- 239000003054 catalyst Substances 0.000 description 13
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 12
- 238000005516 engineering process Methods 0.000 description 11
- GQPLMRYTRLFLPF-UHFFFAOYSA-N Nitrous Oxide Chemical compound [O-][N+]#N GQPLMRYTRLFLPF-UHFFFAOYSA-N 0.000 description 7
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 239000003245 coal Substances 0.000 description 3
- 238000010248 power generation Methods 0.000 description 3
- 229910021529 ammonia Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 1
- 230000009102 absorption Effects 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 229940095054 ammoniac Drugs 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000004202 carbamide Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 239000002817 coal dust Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
Landscapes
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
The utility model discloses the flue structure that a kind of SCR flue gas denitrification system inlet flue gas temperature is adjustable, comprise the first economizer, second economizer, SCR equipment for denitrifying flue gas, SCR inlet flue gas temperature measurement mechanism, flue collector, bypass flue, gas proportioning damper and feedback device thereof, wherein, flue collector comprises three Vertical Channel and two bending linkage path, two kinds of passages alternately connect successively, three Vertical Channel are followed successively by the first straight channel, second straight channel, 3rd straight channel, the first economizer is laid successively in first straight channel, second economizer, SCR equipment for denitrifying flue gas is laid with in 3rd straight channel, bypass flue is provided with between first straight channel and the second straight channel, bypass flue is provided with gas proportioning damper.The utility model structure is simple, and field conduct is convenient, can ensure that SCR inlet flue gas temperature is in its reaction temperature window ranges, greatly improves the safety and reliability that SCR flue gas denitrification system runs.
Description
Technical field
The utility model relates to the adjustable flue structure of a kind of SCR flue gas denitrification system inlet flue gas temperature.
Background technology
Coal is main primary energy in China, accounts for more than 60% of energy resource consumption total amount, and wherein gross coal consumption rate has accounted for 50%.According to " first time national Pollutant source investigation publication " display, within 2007, national nitrogen oxide emission reaches 1797.7 ten thousand tons, and wherein the discharge capacity of coal-burning power plant is 6,950,000 tons, accounts for 38.7% of total amount, visible, coal fired power generation is one of main source of China atmosphere pollution NOx.Along with the develop rapidly of China's economy, the installed capacity of generating set constantly increases, if do not take effective control measure, the nitrogen oxide emission expecting coal-burning power plant in 2015 will reach 1,116 ten thousand tons, will reach 1,234 ten thousand tons to the year two thousand twenty.Visible, the discharge of thermal power plant's nitrogen oxide will be more and more serious on the impact of ecological environment, realize the key that thermal power plant's nitrogen oxide reduction of discharging is discharged nitrous oxides overall control.For this reason, China has promulgated up-to-date " thermal power plant's air pollution emission standard (GB13223-2011) ", and formally implements on January 1st, 2012.Clear stipulaties in standard, key area was from 1 day January in 2012, and the newly-built thermal power generation boiler NOx discharge upper limit is 100mg/m
3; From 1 day July in 2014, the existing thermal power generation boiler NOx discharge upper limit was 100mg/m
3.
The 1950's, developed country starts to study the formation mechanism of nitrogen oxide and control method, and progressively realizes business application.At present, what be able to large-scale commercial application in thermal power plant's nitrogen oxide control device mainly contains two kinds: low NOx combusting technology and gas denitrifying technology.What low NOx combusting technology mainly adopted is the burning of stove internal classification, what gas denitrifying technology mainly adopted is that SNCR technology SNCR, SCR technology SCR and SNCR/SCR combine gas denitrifying technology three kinds, wherein SCR technology accounts for most market demand, be considered to current so that from now on quite over a long time in topmost gas denitrifying technology.
SCR method denitration principle is under catalyst action, and reducing agent (ammonia that liquefied ammonia or urea etc. generate) reacts with NOx selectively and generates harmless N
2and H
2o, thus the object reaching removing NOx, its reaction equation is as shown in (1.1) ~ (1.4).In the NOx that coal-fired boiler combustion produces, NO accounts for 90%, therefore it has been generally acknowledged that (1.1) main reaction formula for coal-burning boiler SCR denitrating flue gas.
4NO+4NH
3+O
2→4N
2+6H
2O （1.1）
6NO+4NH
3→5N
2+6H
2O （1.2）
6NO
2+8NH
3→7N
2+12H
2O （1.3）
2NH
3+NO+NO
2→2N
2+3H
2O （1.4）
Catalyst is the most crucial part of SCR method denitrating system, and the quality of its performance directly affects the denitration effect of SCR.The typical reaction temperature window of SCR technology is 320 DEG C ~ 400 DEG C, and when reaction temperature is higher, catalyst can produce sintering or crystalline polamer; When reaction temperature is lower, the activity of catalyst can reduce at the micropore of catalyst surface condensation blocking catalyst because of sulfate of ammoniac.Therefore, the key issue that inlet flue gas temperature becomes SCR flue gas denitrification system safety, Effec-tive Function is controlled.
Summary of the invention
The utility model is in order to solve the problem, propose the flue structure that a kind of SCR flue gas denitrification system inlet flue gas temperature is adjustable, this flue structure is simple, and field conduct is convenient, can ensure that SCR inlet flue gas temperature is in its reaction temperature window ranges, greatly improve the safety and reliability that SCR runs.
To achieve these goals, the utility model adopts following technical scheme:
The flue structure that a kind of SCR flue gas denitrification system inlet flue gas temperature is adjustable, comprise the first economizer, second economizer, SCR equipment for denitrifying flue gas, SCR inlet flue gas temperature measurement mechanism, flue collector, bypass flue, gas proportioning damper and feedback device thereof, wherein, flue collector comprises three Vertical Channel and two bending linkage path, two kinds of passages alternately connect successively, three Vertical Channel are followed successively by the first straight channel, second straight channel, 3rd straight channel, the first economizer is laid successively in first straight channel, second economizer, SCR equipment for denitrifying flue gas is laid with in 3rd straight channel, bypass flue is provided with between first straight channel and the second straight channel, bypass flue is provided with gas proportioning damper.
Described first economizer is light pipe economizer or H type economizer.
Described second economizer is light pipe economizer or H type economizer.
Described first economizer and the second economizer are arranged in series in flue.
The influent header of described second economizer is connected with main feed water pipe road.
The outlet header of described first economizer is connected with boiler-steam dome.
Described bypass flue is provided with gas proportioning damper, and is provided with open degree feedback device.
The junction of described bypass flue and the first straight channel is arranged between the first economizer, the second economizer.
The front end that described 3rd straight channel is laying SCR equipment for denitrifying flue gas place is provided with flue gas temperature measurement device, and the end of the 3rd straight channel is provided with air preheater.
Described flue collector connects boiler furnace.
The beneficial effects of the utility model are:
(1) when SCR inlet flue gas temperature is lower than catalyst reaction temperatures lower window edge, by opening large flue gas by-pass damper, reducing the exhaust gas volumn through the second economizer, inlet flue gas temperature can be increased to claimed range;
(2) when SCR inlet flue gas temperature is higher than catalyst reaction temperatures window upper limit, by turning down gas bypass baffle plate, increasing the exhaust gas volumn through the second economizer, inlet flue gas temperature can be reduced to claimed range;
(3) gas bypass controllable register aperture can adjust automatically with the change of SCR inlet flue gas temperature;
(4) first economizers and the second economizer use light pipe or H type extended surface tube according to actual conditions, can meet different thermal transmission requirement;
(5) device structure is simple, and field conduct is convenient, greatly enhances the control ability of SCR inlet flue gas temperature.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model.
Wherein, 1. boiler furnace, 2. flue collector, 3. the first economizer, 4. the second economizer, 5. bypass flue, 6. gas proportioning damper, 7. feedback device, 8.SCR equipment for denitrifying flue gas, 9. flue gas temperature measurement device, 10. air preheater.
Detailed description of the invention:
Below in conjunction with accompanying drawing and embodiment, the utility model is described in further detail.
As shown in Figure 1, the flue structure that a kind of SCR flue gas denitrification system inlet flue gas temperature is adjustable, the flue structure that a kind of SCR flue gas denitrification system inlet flue gas temperature is adjustable, comprise the first economizer 3, second economizer 4, SCR equipment for denitrifying flue gas 8, SCR inlet flue gas temperature measurement mechanism 9, flue collector 2, bypass flue 5, gas proportioning damper 6 and feedback device 7 thereof, wherein, flue collector 2 comprises three Vertical Channel and two bending linkage path, two kinds of passages alternately connect successively, three Vertical Channel are followed successively by the first straight channel, second straight channel, 3rd straight channel, the first economizer 3 is laid successively in first straight channel, second economizer 4, SCR equipment for denitrifying flue gas 8 is laid with in 3rd straight channel, first straight channel, bypass flue 5 is separately provided with between second straight channel, gas proportioning damper 6 is provided with in bypass flue 5.First economizer 3 is light pipe economizer or H type economizer.Second economizer 4 is light pipe economizer or H type economizer.
First economizer 3 and the second economizer 4 are arranged in series in flue.The influent header of the second economizer 4 is connected with main feed water pipe road.
The outlet header of the first economizer 3 is connected with boiler-steam dome.
Bypass flue 5 is provided with gas proportioning damper 6, and installs open degree feedback device 7.The junction of bypass flue 5 and the first straight channel is arranged between the first economizer 3, second economizer 4.
The end that 3rd straight channel is provided with flue gas temperature measurement device the 9, three straight channel in the front end of laying SCR equipment for denitrifying flue gas 8 place is provided with air preheater 10.
Flue collector 2 connects boiler furnace 1.
Coal dust and air burn and generate high-temperature flue gas in boiler furnace 1, and it arrives the first economizer 3 after the heating surface heat absorptions at different levels in the water-cooling wall in burner hearth 1 and flue collector 2.Export at the first economizer 3, flue gas is divided into two-way: (1) one tunnel enters the gas approach of SCR equipment for denitrifying flue gas 8 through bypass flue 5; (2) one tunnel second economizers 4 enter the gas approach of SCR equipment for denitrifying flue gas 8.In order to regulate the exhaust gas volumn in two-way flue, at bypass flue 5, gas proportioning damper 6 is installed, and install feedback device 7 additional simultaneously, this feedback device 7 adjusts the aperture of gas proportioning damper 6 automatically according to the temperature data of the inlet flue gas temperature measurement mechanism 9 of SCR equipment for denitrifying flue gas 8, reach the object of control SCR equipment for denitrifying flue gas 8 inlet flue gas temperature, concrete operation method is: when the temperature that the inlet flue gas temperature measurement mechanism 9 of SCR equipment for denitrifying flue gas 8 records is lower than catalyst reaction temperatures lower window edge 320 DEG C (can according to specificity of catalyst sets itself), large flue gas by-pass damper 6 is opened by feedback device 7, reduce the exhaust gas volumn through the second economizer 4, inlet flue gas temperature is increased to claimed range, when the temperature that the inlet flue gas temperature measurement mechanism 9 of SCR flue gas denitrification system 8 records is higher than catalyst reaction temperatures window upper limit 400 DEG C (can according to specificity of catalyst sets itself), gas bypass baffle plate 6 is turned down by feedback device 7, increase the exhaust gas volumn through the second economizer 4, inlet flue gas temperature is reduced to claimed range.Like this, just achieve the regulable control of SCR flue gas denitrification system 8 inlet flue gas temperature, ensure that catalyst reaction temperatures maintains in the window temperature of regulation all the time, greatly improve the safety and reliability that SCR flue gas denitrification system runs.
By reference to the accompanying drawings detailed description of the invention of the present utility model is described although above-mentioned; but the restriction not to the utility model protection domain; one of ordinary skill in the art should be understood that; on the basis of the technical solution of the utility model, those skilled in the art do not need to pay various amendment or distortion that creative work can make still within protection domain of the present utility model.
Claims (9)
1. the flue structure that a SCR flue gas denitrification system inlet flue gas temperature is adjustable, it is characterized in that: comprise the first economizer, second economizer, SCR equipment for denitrifying flue gas, SCR inlet flue gas temperature measurement mechanism, flue collector, bypass flue, gas proportioning damper and feedback device thereof, wherein, flue collector comprises three Vertical Channel and two bending linkage path, two kinds of passages alternately connect successively, three Vertical Channel are followed successively by the first straight channel, second straight channel, 3rd straight channel, the first economizer is laid successively in first straight channel, second economizer, SCR equipment for denitrifying flue gas is laid with in 3rd straight channel, bypass flue is provided with between first straight channel and the second straight channel, bypass flue is provided with gas proportioning damper, described bypass flue is provided with gas proportioning damper, and is provided with open degree feedback device.
2. the flue structure that a kind of SCR flue gas denitrification system inlet flue gas temperature as claimed in claim 1 is adjustable, is characterized in that: described first economizer is light pipe economizer or H type economizer.
3. the flue structure that a kind of SCR flue gas denitrification system inlet flue gas temperature as claimed in claim 1 is adjustable, is characterized in that: described second economizer is light pipe economizer or H type economizer.
4. the flue structure that a kind of SCR flue gas denitrification system inlet flue gas temperature as claimed in claim 1 is adjustable, is characterized in that: described first economizer and the second economizer are arranged in series in flue.
5. the flue structure that a kind of SCR flue gas denitrification system inlet flue gas temperature as claimed in claim 3 is adjustable, is characterized in that: the influent header of described second economizer is connected with main feed water pipe road.
6. the flue structure that a kind of SCR flue gas denitrification system inlet flue gas temperature as claimed in claim 2 is adjustable, is characterized in that: the outlet header of described first economizer is connected with boiler-steam dome.
7. the flue structure that a kind of SCR flue gas denitrification system inlet flue gas temperature as claimed in claim 6 is adjustable, is characterized in that: the junction of described bypass flue and the first straight channel is arranged between the first economizer, the second economizer.
8. the flue structure that a kind of SCR flue gas denitrification system inlet flue gas temperature as claimed in claim 1 is adjustable, it is characterized in that: the front end that described 3rd straight channel is laying SCR equipment for denitrifying flue gas place is provided with flue gas temperature measurement device, and the end of the 3rd straight channel is provided with air preheater.
9. the flue structure that a kind of SCR flue gas denitrification system inlet flue gas temperature as claimed in claim 1 is adjustable, is characterized in that: described flue collector connects boiler furnace.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420182708.9U CN204063081U (en) | 2014-04-15 | 2014-04-15 | The flue structure that a kind of SCR flue gas denitrification system inlet flue gas temperature is adjustable |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420182708.9U CN204063081U (en) | 2014-04-15 | 2014-04-15 | The flue structure that a kind of SCR flue gas denitrification system inlet flue gas temperature is adjustable |
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| CN204063081U true CN204063081U (en) | 2014-12-31 |
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| CN201420182708.9U Expired - Lifetime CN204063081U (en) | 2014-04-15 | 2014-04-15 | The flue structure that a kind of SCR flue gas denitrification system inlet flue gas temperature is adjustable |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104560078A (en) * | 2015-02-02 | 2015-04-29 | 银川多贝科技有限公司 | S-shaped flue gas channel |
| CN105402746A (en) * | 2015-12-24 | 2016-03-16 | 哈尔滨锅炉厂有限责任公司 | Membrane type wall tube screen tube-bending device for forming smoke exhaust opening and smoke gas mixing method |
| CN105485657A (en) * | 2015-04-28 | 2016-04-13 | 无锡华光锅炉股份有限公司 | Coal economizer bypass flue structure |
| CN105597539A (en) * | 2016-03-25 | 2016-05-25 | 上海益格新技术工程有限公司 | SCR (Selective Catalytic Reduction) flue gas denitration system of hot confluence main pipe |
| CN106139889A (en) * | 2015-03-09 | 2016-11-23 | 刘炎军 | A kind of Industrial Boiler uses full load flue-gas denitration process and the device of afterburning |
| CN106178870A (en) * | 2015-05-07 | 2016-12-07 | 嘉兴新嘉爱斯热电有限公司 | A kind of SNCR-SCR combines flue gas denitrification system |
| CN106334439A (en) * | 2016-09-21 | 2017-01-18 | 天津市电力科技发展有限公司 | System for increasing smoke temperature at inlet of SCR denitration device |
| CN106362590A (en) * | 2016-11-03 | 2017-02-01 | 广东电网有限责任公司电力科学研究院 | Flue gas system and method for raising fume temperature of inlet of SCR (Selective Catalytic Reduction) denitration device |
| CN108654374A (en) * | 2018-07-24 | 2018-10-16 | 宁波国电龙高科环境工程技术有限公司 | A kind of ultra-clean Processing tecchnics system of flue gas |
| CN108854522A (en) * | 2018-07-02 | 2018-11-23 | 浙江宜清环境技术有限公司 | A kind of heating of full working scope denitration flue gas and even distribution device based on internal baffle |
| CN110822461A (en) * | 2019-11-01 | 2020-02-21 | 华电电力科学研究院有限公司 | Method for realizing wide-load denitration by bypass grading economizer |
| CN111649317A (en) * | 2020-05-13 | 2020-09-11 | 华能应城热电有限责任公司 | Wide-load denitration device and denitration method thereof |
| CN111795391A (en) * | 2020-07-01 | 2020-10-20 | 哈尔滨锅炉厂有限责任公司 | Waste incinerator economizer flue gas bypass system |
| CN113864759A (en) * | 2021-09-18 | 2021-12-31 | 山东中实易通集团有限公司 | System and method for regulating temperature of inlet flue gas of boiler denitration system |
-
2014
- 2014-04-15 CN CN201420182708.9U patent/CN204063081U/en not_active Expired - Lifetime
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104560078A (en) * | 2015-02-02 | 2015-04-29 | 银川多贝科技有限公司 | S-shaped flue gas channel |
| CN106139889A (en) * | 2015-03-09 | 2016-11-23 | 刘炎军 | A kind of Industrial Boiler uses full load flue-gas denitration process and the device of afterburning |
| CN105485657A (en) * | 2015-04-28 | 2016-04-13 | 无锡华光锅炉股份有限公司 | Coal economizer bypass flue structure |
| CN106178870A (en) * | 2015-05-07 | 2016-12-07 | 嘉兴新嘉爱斯热电有限公司 | A kind of SNCR-SCR combines flue gas denitrification system |
| CN106178870B (en) * | 2015-05-07 | 2019-01-08 | 嘉兴新嘉爱斯热电有限公司 | A kind of SNCR-SCR joint flue gas denitrification system |
| CN105402746B (en) * | 2015-12-24 | 2018-04-27 | 哈尔滨锅炉厂有限责任公司 | Membrane panel smoking mouth swan neck system and mixed flue gas method |
| CN105402746A (en) * | 2015-12-24 | 2016-03-16 | 哈尔滨锅炉厂有限责任公司 | Membrane type wall tube screen tube-bending device for forming smoke exhaust opening and smoke gas mixing method |
| CN105597539A (en) * | 2016-03-25 | 2016-05-25 | 上海益格新技术工程有限公司 | SCR (Selective Catalytic Reduction) flue gas denitration system of hot confluence main pipe |
| CN106334439A (en) * | 2016-09-21 | 2017-01-18 | 天津市电力科技发展有限公司 | System for increasing smoke temperature at inlet of SCR denitration device |
| CN106362590A (en) * | 2016-11-03 | 2017-02-01 | 广东电网有限责任公司电力科学研究院 | Flue gas system and method for raising fume temperature of inlet of SCR (Selective Catalytic Reduction) denitration device |
| CN108854522A (en) * | 2018-07-02 | 2018-11-23 | 浙江宜清环境技术有限公司 | A kind of heating of full working scope denitration flue gas and even distribution device based on internal baffle |
| CN108654374A (en) * | 2018-07-24 | 2018-10-16 | 宁波国电龙高科环境工程技术有限公司 | A kind of ultra-clean Processing tecchnics system of flue gas |
| CN110822461A (en) * | 2019-11-01 | 2020-02-21 | 华电电力科学研究院有限公司 | Method for realizing wide-load denitration by bypass grading economizer |
| CN111649317A (en) * | 2020-05-13 | 2020-09-11 | 华能应城热电有限责任公司 | Wide-load denitration device and denitration method thereof |
| CN111795391A (en) * | 2020-07-01 | 2020-10-20 | 哈尔滨锅炉厂有限责任公司 | Waste incinerator economizer flue gas bypass system |
| CN113864759A (en) * | 2021-09-18 | 2021-12-31 | 山东中实易通集团有限公司 | System and method for regulating temperature of inlet flue gas of boiler denitration system |
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