CN203927880U - A kind of economizer that improves SCR system underrun denitration ability - Google Patents
A kind of economizer that improves SCR system underrun denitration ability Download PDFInfo
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- CN203927880U CN203927880U CN201420097167.XU CN201420097167U CN203927880U CN 203927880 U CN203927880 U CN 203927880U CN 201420097167 U CN201420097167 U CN 201420097167U CN 203927880 U CN203927880 U CN 203927880U
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- economizer
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- bypass duct
- catalyst
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- 239000003054 catalyst Substances 0.000 claims abstract description 34
- 239000012530 fluid Substances 0.000 claims abstract description 7
- 239000003245 coal Substances 0.000 claims description 11
- 238000003466 welding Methods 0.000 claims description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 abstract description 29
- 239000003546 flue gas Substances 0.000 abstract description 29
- 230000000694 effects Effects 0.000 abstract description 10
- 230000007613 environmental effect Effects 0.000 abstract description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 10
- 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
- 238000005516 engineering process Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000000428 dust Substances 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 239000003570 air Substances 0.000 description 2
- 229910021529 ammonia Inorganic materials 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000010531 catalytic reduction reaction Methods 0.000 description 2
- 239000003517 fume Substances 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 230000008676 import Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- WWILHZQYNPQALT-UHFFFAOYSA-N 2-methyl-2-morpholin-4-ylpropanal Chemical compound O=CC(C)(C)N1CCOCC1 WWILHZQYNPQALT-UHFFFAOYSA-N 0.000 description 1
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 238000003916 acid precipitation Methods 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 239000012080 ambient air Substances 0.000 description 1
- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 description 1
- 229910052921 ammonium sulfate Inorganic materials 0.000 description 1
- 235000011130 ammonium sulphate Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001413 cellular effect Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000000376 reactant Substances 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- XTQHKBHJIVJGKJ-UHFFFAOYSA-N sulfur monoxide Chemical compound S=O XTQHKBHJIVJGKJ-UHFFFAOYSA-N 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Landscapes
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
- Chimneys And Flues (AREA)
Abstract
The utility model discloses a kind of economizer of the SCR of raising system underrun denitration ability, on the supply line that connects economizer inlet header, a bypass is set, this bypass is divided into two strands of branch roads, article one, branch road is drawn with economizer intermediate header and is connected, another is connected with economizer exit header fairlead, in two arms, along the mobile direction of fluid, is disposed with respectively one-way valve, stop valve and flow control valve.Adopting the utility model is that utilization regulates the aperture of two branch road valves to regulate the flow of by-pass shunt medium, thereby control economizer exit flue-gas temperature by reducing the heat exchange amount of economizer system, make originally not reach the put into operation running on the lower load of condition of SCR and can meet the temperature requirement that SCR puts into operation, effectively improved the SCR of power plant denitrating system continuous operating time, under running on the lower load, in SCR system, the lifting of flue-gas temperature causes the activity of SCR catalyst to raise, SCR system denitration ability strengthens, help power plant within the longer time, to reach better environmental protection index.
Description
Technical field
The utility model relates to flue gas in power station boiler denitration field, specifically refers to a kind of economizer of the SCR of raising system underrun denitration ability.
Background technology
Selective catalytic reduction (SCR) is mainly used in the fields such as thermal power plant, motor vehicle, boats and ships, and its Main Function is to remove the nitrogen oxide that boiler or engine combustion produce.In nitrogen oxide, NO accounts for and is about 95%, NO
2account for and be about 5%, also contain in addition a small amount of N
2o, these gas dischargings, in atmosphere, can produce the harm such as acid rain, photochemical fog, Ozone Layer Depletion, are one of important sources of ambient air pollution.SCR technology is that reactant is adsorbed on catalyst and reacts under the effect of catalyst, generates the N harmless to the mankind
2and H
2o, due to the existence of catalyst, denitration efficiency can reach very high level, and selective catalytic reduction (SCR) has become industrial most important denitration technology at present.
The main energy sources of China is from coal burning, according to statistics, the nitrogen oxide emission of China 67% comes from the burning of coal, and thermal power plant's nitrogen oxide generation accounts for 50% of national total amount, and therefore controlling thermal power plant's discharged nitrous oxides is the most important thing of controlling China's discharged nitrous oxides total amount.Aspect thermal power plant, domestic requirements installs the retrofit work of SCR system additional to the active service unit of denitration device is not installed in recent years.The arrangement of SCR process system mainly comprises that high-temperature high dust is arranged, the low dirt of high temperature is arranged and the low dirt of low temperature is arranged, wherein high-temperature high dust is arranged and is adopted the most generally, SCR reactor is arranged between economizer and air preheater, this arrangement makes the flue-gas temperature that enters SCR denitrating system remain on 280 ℃～420 ℃, the active temperature that meets most catalyst is interval, in active temperature interval, SCR system can obtain good effect, and denitration performance raises along with the rising of flue-gas temperature.But when flue-gas temperature is lower than prescribing a time limit under catalyst activity temperature range, catalyst activity is lower, make one side denitration efficiency lower, the escaping of ammonia rate is higher on the other hand, the ammonia meeting of escaping and the oxysulfide reaction in flue gas generate ammonium sulfate and ammonium hydrogen sulfate, can cause the obstruction of catalyst reaction passage and air downstream preheater when serious.But when flue-gas temperature is higher than prescribing a time limit in catalyst activity temperature range, can make sintering of catalyst or recrystallization, reduce the service life of catalyst.
Consider the impact of temperature on SCR denitrating system and upstream device, the running temperature of SCR system generally designs at 300 ℃～400 ℃, and in this temperature range, catalyst can guarantee to move under higher activity.Because the generation load in power station is commanded by dispatching of power netwoks, in peak times of power consumption, station boiler remains under BMCR or high load capacity operating mode and moves, and the inlet temperature of denitrification apparatus can guarantee that denitrating system normally moves in the temperature range that puts into operation of SCR.Yet station boiler heavy-duty service for a long time, at electricity consumption low peak period, electrical network is lower to the demand of power station generation load, station boiler moves under underload, now in SCR system, the reaction temperature of flue gas is lower, because the activity with temperature of catalyst reduces, so denitration efficiency is also lower.In addition, when denitrification apparatus entrance flue gas temperature does not reach denitrating system and puts into operation lowest temperature, denitrating system is out of service, and the discharge capacity of nitrogen oxide increases, and power station is difficult to reach the environmental protection index of national regulation.Although catalyst quits work on the other hand, but still in the washing away of flue gas, flying dust does not reduce the wearing and tearing of catalyst, causes reduce the service life of catalyst.Therefore,, under Power Station Boiler in Low Loads operating condition, guaranteeing SCR denitrating system efficiency and improving the SCR denitrating system time of putting into operation is a difficult problem that needs solution in domestic denitration art.
Utility model content
Goal of the invention: in order to overcome the deficiencies in the prior art, the utility model provides a kind of economizer of the SCR of raising system underrun denitration ability.
Technical scheme: for solving the problems of the technologies described above, the economizer of a kind of SCR of raising system underrun denitration ability that the utility model provides, comprises burner hearth flue shell, is located at the economizer exit header in burner hearth flue shell, the one group of Coal Saver Hanged Pipe, the economizer intermediate header being connected with each Coal Saver Hanged Pipe, the one group of economizer coiled pipe being connected with economizer intermediate header, the economizer inlet header being connected with economizer coiled pipe that are connected with economizer exit header and the SCR reactor being connected with burner hearth flue outer casing bottom; Between described economizer inlet header and economizer exit header, be provided with one first bypass duct, described the first bypass duct is provided with successively respectively the first one-way valve, the first stop valve and first flow control valve on fluid flow direction, respectively and between the first bypass duct or economizer inlet header, be provided with one second bypass duct, described the second bypass duct is provided with successively respectively the second one-way valve, the second stop valve and second adjustable valve to described each economizer intermediate header on fluid flow direction.
Further, described SCR reactor comprises reactor shell, is located at the reserved layer of catalyst in reactor shell, the catalyst first floor and the catalyst second layer successively.
Further, one end of described the second arm is connected with the first arm by three-way pipe connector, and the other end of the second arm is connected by welding manner with several economizer intermediate headers.
Further, described burner hearth flue outer casing bottom is provided with an economizer hopper.
Further, the two ends of described the first bypass duct are respectively equipped with a three-way pipe connector.
Beneficial effect: the utility model just has the following advantages with respect to prior art:
The utility model is to adopt utilization to regulate the aperture of two branch road valves to regulate the flow of by-pass shunt medium, thereby control economizer exit flue-gas temperature by reducing the heat exchange amount of economizer system, make originally not reach the put into operation running on the lower load of condition of SCR and can meet the temperature requirement that SCR puts into operation, effectively improved economizer SCR denitrating system continuous operating time in power plant, on the other hand, under running on the lower load, in economizer, in SCR system, the lifting of flue-gas temperature causes the activity of SCR catalyst to raise, SCR system denitration ability strengthens, help power plant within the longer time, to reach better environmental protection index.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model.
Fig. 2 is the first bypass duct of the present utility model and the second bypass duct jockey schematic diagram.
The specific embodiment
Below in conjunction with accompanying drawing, the utility model is further described.
As depicted in figs. 1 and 2, improve an economizer for SCR system underrun denitration ability, comprise burner hearth flue shell 30, be located at the economizer exit header 2 in burner hearth flue shell 30, the one group of Coal Saver Hanged Pipe 5, the economizer intermediate header 6 being connected with each Coal Saver Hanged Pipe 5, the one group of economizer coiled pipe 7 being connected with economizer intermediate header 6, the economizer inlet header 14 being connected with economizer coiled pipe 7 that are connected with economizer exit header 2 and the SCR reactor being connected with burner hearth flue shell 30 bottoms; Between described economizer inlet header 14 and economizer exit header 2, be provided with one first bypass duct 3, described the first bypass duct 3 is provided with successively respectively the first one-way valve 9, the first stop valve 8 and first flow control valve 4 on fluid flow direction, respectively and between the first bypass duct 3 or economizer inlet header 14, be provided with one second bypass duct 10, described the second bypass duct 10 is provided with successively respectively the second one-way valve 13, the second stop valve 12 and second adjustable valve 11 to described each economizer intermediate header 6 on fluid flow direction; Described burner hearth flue shell 30 bottoms are provided with an economizer hopper 16; Described SCR reactor comprises reactor shell 31, is located at the reserved layer 18 of catalyst in reactor shell 31, the catalyst first floor 19 and the catalyst second layer 20 successively; One end of described the second bypass duct 3 is connected with the first bypass duct 3 by three-way pipe 24, and the other end of the second bypass duct 3 is connected by welding manner with several economizer intermediate headers 6; The two ends of described the first bypass duct are respectively equipped with one first three-way pipe connector 22, the second three-way pipe connector 23.
The condition that puts into operation of the SCR denitrating system in power station in economizer is determined according to the active temperature of SCR catalyst is interval, is generally designed at 300 ℃～400 ℃.Under underrun operating mode, gas enters from economizer import flue gas 1, boiler economizer outlet flue gas 15 temperature are lower than 300 ℃, and between economizer exit and SCR reactor inlet, there is no heat transmission equipment, therefore SCR reactor inlet flue gas 17 temperature and economizer exit temperature approximately equal, lower than the put into operation lower limit of temperature range of SCR system.If SCR inlet flue gas 17 temperature are little lower than the put into operation amplitude of lowest temperature of SCR system, open the second stop valve 12, and progressively increase the flow that the second control valve 11 valve openings are controlled 10 minutes flow mediums of the second branch road pipeline section; If SCR inlet flue gas 17 temperature are larger lower than the put into operation amplitude of lowest temperature of SCR system, open the first stop valve 8, and the valve opening that progressively increases by the first control valve 4 is controlled the flow of 3 minutes flow mediums of the first branch road pipeline section; Shunting action due to bypass, the rate-of flow of participating in heat exchange can reduce, cause the heat exchange amount of medium and flue gas to reduce, therefore flue gas reduces at the thermal discharge in economizer surface region, economizer exit flue gas 15 and SCR import flue gas 17 temperature are raise over 300 ℃, reach the temperature range that puts into operation of SCR system, effectively improved the operational percentage of SCR system and the effective storage life of catalyst.
The optimization method of a kind of SCR underrun of the present utility model and control strategy situation when real work is as follows:
Boiler economizer system heat-transfer surface is mainly comprised of Coal Saver Hanged Pipe 5 and economizer coiled pipe 7, economizer coiled pipe 7 is connected between inlet header 14 and intermediate header 7, Coal Saver Hanged Pipe 5 is connected between intermediate header 7 and outlet header 2, the heat exchange area of economizer coiled pipe 7 is greater than Coal Saver Hanged Pipe 5, plays main heat exchange effect.Under boiler at low load operating condition, if economizer exit flue gas 15 temperature are lower than the SCR lowest temperature that puts into operation, and it is less that both differ amplitude, now open bypass the second stop valve 12, and progressively increase the rate-of flow that the second control valve 11 valve openings are controlled bypass, shunting action due to bypass, the rate-of flow of participating in heat exchange in economizer coiled pipe 7 can reduce, cause the heat exchange amount of medium and flue gas to reduce, therefore the thermal discharge in flue gas 7 heat exchange regions in economizer coiled pipe reduces, thereby economizer exit flue gas 15 temperature are raise over 300 ℃.If economizer exit flue gas 15 temperature and SCR put into operation, lowest temperature differs larger, now can open bypass the first stop valve 8, and progressively increase the rate-of flow that the first control valve 4 valve openings are controlled bypass, because not entering economizer system completely, the medium of now bypass do not participate in heat exchange, impact on raising economizer exit temperature is larger, the aperture of the control valve by reasonable control the first bypass duct and the second bypass duct, can control the temperature of the outlet flue gas 15 of economizer neatly.The design of the SCR system temperature range that puts into operation is 300 ℃～400 ℃, three layers of catalyst of design in reactor, the first floor is reserved layer 18, reserved layer is below for being filled with the catalyst first floor 19 and the catalyst second layer 20 of cellular catalyst, owing to there is no heat transmission equipment between economizer exit and SCR reactor inlet, therefore enter flue gas 17 temperature and the economizer exit temperature approximately equal of SCR ground floor catalyst 19, reach the temperature range that puts into operation of SCR system, effectively improved the operational percentage of SCR system and the effective storage life of catalyst.In addition, the thermal capacity of side medium is higher than fume side, when reducing identical heat exchange amount, the amplitude that fume side outlet temperature raises is greater than the amplitude that side medium outlet temperature reduces, therefore the impact on boiler economic operation economizer media outlet temperature being reduced is less, has guaranteed the operability of the utility model in engineering.
The above is only preferred embodiment of the present utility model; be noted that for those skilled in the art; do not departing under the prerequisite of the utility model principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection domain of the present utility model.
Claims (5)
1. an economizer that improves SCR system underrun denitration ability, it is characterized in that: comprise burner hearth flue shell (30), be located at the economizer exit header (2) in burner hearth flue shell (30), the one group of Coal Saver Hanged Pipe (5) being connected with economizer exit header (2), the economizer intermediate header (6) being connected with each Coal Saver Hanged Pipe (5), the one group of economizer coiled pipe (7) being connected with economizer intermediate header (6), the economizer inlet header (14) being connected with economizer coiled pipe (7) and the SCR reactor being connected with burner hearth flue shell (30) bottom, between described economizer inlet header (14) and economizer exit header (2), be provided with one first bypass duct (3), described the first bypass duct (3) is provided with successively respectively the first one-way valve (9) on fluid flow direction, the first stop valve (8) and first flow control valve (4), described each economizer intermediate header (6) respectively and between the first bypass duct (3) or economizer inlet header (14), be provided with one second bypass duct (10), described the second bypass duct (10) is provided with successively respectively the second one-way valve (13) on fluid flow direction, the second stop valve (12) and second adjustable valve (11).
2. the economizer of raising according to claim 1 SCR system underrun denitration ability, is characterized in that: described SCR reactor comprises reactor shell (31), is located at the reserved layer of catalyst (18), the catalyst first floor (19) and the catalyst second layer (20) in reactor shell (31) successively.
3. the economizer of raising according to claim 1 SCR system underrun denitration ability, it is characterized in that: one end of described the second arm (10) is connected with the first arm (3) by three-way pipe connector (24), and the other end of the second arm (10) is connected by welding manner with several economizer intermediate headers (6).
4. the economizer of raising SCR system underrun denitration ability according to claim 1, is characterized in that: described burner hearth flue shell (30) bottom is provided with an economizer hopper (16).
5. the economizer of raising SCR system underrun denitration ability according to claim 1, is characterized in that: the two ends of described the first bypass duct (3) are respectively equipped with a three-way pipe connector.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420097167.XU CN203927880U (en) | 2014-03-05 | 2014-03-05 | A kind of economizer that improves SCR system underrun denitration ability |
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| CN201420097167.XU CN203927880U (en) | 2014-03-05 | 2014-03-05 | A kind of economizer that improves SCR system underrun denitration ability |
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| CN203927880U true CN203927880U (en) | 2014-11-05 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103900073A (en) * | 2014-03-05 | 2014-07-02 | 东南大学 | Economizer for improving denitrification capacity of SCR system during low-load operation |
| CN104819451A (en) * | 2015-04-03 | 2015-08-05 | 广东电网有限责任公司电力科学研究院 | Boiler economizer capable of controlling SCR inlet smoke temperature |
| 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 |
| CN106765039A (en) * | 2016-12-27 | 2017-05-31 | 宁夏清远顺合环保科技有限公司 | A kind of SCR inlet flue gas water side temperature raising system and method |
| CN108211790A (en) * | 2018-02-09 | 2018-06-29 | 河南环碧环保工程设备有限公司 | A kind of SCR denitration device and denitrating technique using ammonia-spraying grid |
| CN110568005A (en) * | 2018-06-05 | 2019-12-13 | 武汉理工大学 | Ice slurry-seawater two-phase flow heat exchange experiment table |
-
2014
- 2014-03-05 CN CN201420097167.XU patent/CN203927880U/en not_active Expired - Lifetime
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103900073A (en) * | 2014-03-05 | 2014-07-02 | 东南大学 | Economizer for improving denitrification capacity of SCR system during low-load operation |
| CN104819451A (en) * | 2015-04-03 | 2015-08-05 | 广东电网有限责任公司电力科学研究院 | Boiler economizer capable of controlling SCR inlet smoke temperature |
| CN104819451B (en) * | 2015-04-03 | 2016-08-24 | 广东电网有限责任公司电力科学研究院 | A kind of boiler economizer that can control SCR inlet flue-gas temperature |
| 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 |
| CN106765039A (en) * | 2016-12-27 | 2017-05-31 | 宁夏清远顺合环保科技有限公司 | A kind of SCR inlet flue gas water side temperature raising system and method |
| CN108211790A (en) * | 2018-02-09 | 2018-06-29 | 河南环碧环保工程设备有限公司 | A kind of SCR denitration device and denitrating technique using ammonia-spraying grid |
| CN110568005A (en) * | 2018-06-05 | 2019-12-13 | 武汉理工大学 | Ice slurry-seawater two-phase flow heat exchange experiment table |
| CN110568005B (en) * | 2018-06-05 | 2022-06-03 | 武汉理工大学 | Ice slurry-seawater two-phase flow heat exchange experiment table |
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