CN203927879U - A kind of economizer that improves SCR operational percentage under running on the lower load - Google Patents
A kind of economizer that improves SCR operational percentage under running on the lower load Download PDFInfo
- Publication number
- CN203927879U CN203927879U CN201420097259.8U CN201420097259U CN203927879U CN 203927879 U CN203927879 U CN 203927879U CN 201420097259 U CN201420097259 U CN 201420097259U CN 203927879 U CN203927879 U CN 203927879U
- Authority
- CN
- China
- Prior art keywords
- economizer
- scr
- lower load
- header
- under running
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 239000003054 catalyst Substances 0.000 claims abstract description 31
- 239000003245 coal Substances 0.000 claims description 9
- 239000012530 fluid Substances 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 9
- 239000003517 fume Substances 0.000 abstract description 4
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 230000000630 rising effect Effects 0.000 abstract description 3
- 235000019504 cigarettes Nutrition 0.000 abstract description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 23
- 239000003546 flue gas Substances 0.000 description 23
- 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
- 238000005516 engineering process Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000000428 dust Substances 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 230000008676 import Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 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
- 229910021529 ammonia Inorganic materials 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
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 230000001413 cellular effect Effects 0.000 description 1
- 238000002485 combustion reaction 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
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Landscapes
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
The utility model discloses a kind of economizer that improves SCR operational percentage under running on the lower load, a bypass is set on economizer entrance feedwater piping, the intermediate header of bypass conduit and economizer is connected, and the direction along media flow in bypass is equipped with check valve, choke valve and flow control valve successively.The utility model is to utilize under running on the lower load, to regulate bypass valve aperture to reduce the rate-of flow between economizer inlet header and intermediate header in boiler, thereby reduce the thermal discharge of economizer fume side, make the temperature rise of economizer exit cigarette, effectively improved the operational percentage of the SCR of power plant under running on the lower load, the rising of SCR system temperature causes SCR catalyst activity to promote, SCR system obtains higher denitration ability, thereby helps 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 that improves SCR operational percentage under running on the lower load.
Background technology
Selective catalytic reduction (SCR) is current the most ripe industrial denitration technology.This technology 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.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.
In recent years atmosphere pollutants emission standards day stricter, 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.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, makes one side denitration efficiency lower, and the escaping of ammonia rate is higher on the other hand, the NH of escape
3sO in meeting and flue gas
3reaction generates ammonium sulfate (NH
4)
2sO
4with ammonium hydrogen sulfate NH
4hSO
4, when serious, can cause the obstruction of catalyst reaction passage and air downstream preheater.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.The impact of the flue-gas temperature of considering SCR system on SCR 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.
Summary of the invention
Utility model object: in order to overcome the deficiencies in the prior art, utility model provides a kind of economizer that improves SCR operational percentage under running on the lower load.
Technical scheme: for solving the problems of the technologies described above, a kind of economizer that improves SCR operational percentage under running on the lower load that the utility model provides, the SCR reactor that comprises housing, is located at the economizer exit header in housing, the heat-exchanger rig being connected with economizer exit header, the economizer inlet header being connected with heat-exchanger rig and is connected with housing bottom; Described heat-exchanger rig comprises one group of Coal Saver Hanged Pipe connected with economizer exit header, 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, and described economizer coiled pipe is connected with economizer inlet header; Between described economizer inlet header and economizer intermediate header, be provided with a bypass duct, described bypass duct is provided with successively respectively one-way valve, stop valve and flow control valve 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 catalyst sublevel successively.
Further, described housing bottom is provided with an economizer hopper.
Further, the two ends of described bypass duct are respectively equipped with a three-way pipe connector, and bypass duct and intermediate header connected mode are welding.
Further, described control valve is electronic control and regulation valve.
Beneficial effect: the utility model just has the following advantages with respect to prior art:
The utility model is to utilize under running on the lower load, to regulate bypass valve aperture to reduce the rate-of flow between economizer inlet header and intermediate header in boiler, thereby reduce the thermal discharge of economizer fume side, make the temperature rise of economizer exit cigarette, owing to there is no heat transmission equipment between economizer exit and SCR reactor inlet, therefore the flue-gas temperature that enters SCR system obtains lifting equally, make some originally not reach the put into operation running on the lower load of condition of SCR and meet the temperature requirement that SCR puts into operation, effectively improved the operational percentage of the SCR of power plant under running on the lower load.In addition, the rising of SCR system temperature causes SCR catalyst activity to promote, and SCR system obtains higher denitration ability, thereby helps 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 bypass duct connection diagram of the present utility model.
The specific embodiment
Below in conjunction with accompanying drawing, the utility model is further described.
As depicted in figs. 1 and 2, under running on the lower load, improve an economizer for SCR operational percentage, the SCR reactor that comprises housing 20, is located at the economizer exit header 2 in housing 20, the heat-exchanger rig being connected with economizer exit header 2, the economizer inlet header 10 being connected with heat-exchanger rig and is connected with housing 20 bottoms, described heat-exchanger rig comprises one group of Coal Saver Hanged Pipe 3 connected with economizer exit header 2, the economizer intermediate header 4 being connected with each Coal Saver Hanged Pipe 3, the one group of economizer coiled pipe 6 being connected with economizer intermediate header 4, and described economizer coiled pipe 6 is connected with economizer inlet header 10, between described economizer inlet header 10 and economizer intermediate header 4, be provided with a bypass duct 5, described bypass duct 5 is provided with successively respectively one-way valve 9 on fluid flow direction, stop valve 8 and flow control valve 7, described SCR reactor comprises reactor shell 21, be located at successively the reserved layer 14 of catalyst in reactor shell 21, the catalyst first floor 15 and catalyst sublevel 16, described housing 20 bottoms are provided with an economizer hopper 12, the two ends of described bypass duct 5 are respectively equipped with one first three-way pipe connector 18, the second three-way pipe connector 19, described flow control valve 7 is electronic control and regulation valve.
The condition that SCR denitrating system puts into operation is determined according to the active temperature of SCR catalyst is interval, is generally designed to 300 ℃～400 ℃.Under underrun operating mode, economizer import flue gas 1 enters economizer, boiler economizer outlet flue gas 11 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 13 temperature and economizer exit temperature approximately equal, lower than the put into operation lower limit of temperature range of SCR system, now open bypass stop valve 8, and progressively increase the rate-of flow that control valve 7 valve openings are controlled bypass, 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 11 and SCR import flue gas 13 temperature are raise over 300 ℃, reach the temperature range that puts into operation of SCR system, the operational percentage of SCR system and the effective storage life of catalyst have effectively been improved.
A kind of strategy situation when real work that improves running on the lower load SCR operational percentage of the present utility model is as follows:
Boiler economizer heat-exchanger rig 17 is mainly comprised of Coal Saver Hanged Pipe 3 and economizer coiled pipe 5, coiled pipe is connected between inlet header 10 and intermediate header 6, column pipe is connected between intermediate header and outlet header 2, the heat exchange area of coiled pipe is greater than column pipe, plays main heat exchange effect.Under boiler at low load operating condition, economizer exit flue gas 11 temperature are lower than 300 ℃, now open bypass stop valve 8, and progressively increase the rate-of flow that control valve 7 valve openings are controlled bypass, due to the shunting action of bypass, the rate-of flow of participating in heat exchange in coiled pipe can reduce, and causes the heat exchange amount of medium and flue gas to reduce, therefore flue gas reduces at the thermal discharge in coiled pipe heat exchange region, thereby economizer exit flue-gas temperature is raise over 300 ℃.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 14, reserved layer is below for being filled with the catalyst first floor 15 and the catalyst sublevel 16 of cellular catalyst, owing to there is no heat transmission equipment between economizer exit and SCR reactor inlet, therefore enter flue gas 13 temperature and the economizer exit temperature approximately equal of SCR ground floor catalyst 15, 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. under running on the lower load, improve an economizer for SCR operational percentage, it is characterized in that: the SCR reactor that comprises housing, is located at the economizer exit header in housing, the heat-exchanger rig being connected with economizer exit header, the economizer inlet header being connected with heat-exchanger rig and is connected with housing bottom; Described heat-exchanger rig comprises one group of Coal Saver Hanged Pipe connected with economizer exit header, 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, and described economizer coiled pipe is connected with economizer inlet header; Between described economizer inlet header and economizer intermediate header, be provided with a bypass duct, described bypass duct is provided with successively respectively one-way valve, stop valve and flow control valve on fluid flow direction.
2. the economizer that improves SCR operational percentage under running on the lower load according to claim 1, is characterized in that: described SCR reactor comprises reactor shell, is located at the reserved layer of catalyst, the catalyst first floor and the catalyst sublevel in reactor shell successively.
3. the economizer that improves SCR operational percentage under running on the lower load according to claim 1, is characterized in that: described housing bottom is provided with an economizer hopper.
4. the economizer that improves SCR operational percentage under running on the lower load according to claim 1, is characterized in that: the two ends of described bypass duct are respectively equipped with a three-way pipe connector.
5. the economizer that improves SCR operational percentage under running on the lower load according to claim 1, is characterized in that: described control valve is electronic control and regulation valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420097259.8U CN203927879U (en) | 2014-03-05 | 2014-03-05 | A kind of economizer that improves SCR operational percentage under running on the lower load |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420097259.8U CN203927879U (en) | 2014-03-05 | 2014-03-05 | A kind of economizer that improves SCR operational percentage under running on the lower load |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203927879U true CN203927879U (en) | 2014-11-05 |
Family
ID=51823684
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420097259.8U Expired - Lifetime CN203927879U (en) | 2014-03-05 | 2014-03-05 | A kind of economizer that improves SCR operational percentage under running on the lower load |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203927879U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103939884A (en) * | 2014-03-05 | 2014-07-23 | 东南大学 | Economizer improving SCR commissioning rate under low load working condition |
| CN104406155A (en) * | 2014-11-27 | 2015-03-11 | 哈尔滨锅炉厂有限责任公司 | Connecting pipe for improving water temperature of coal economizer |
-
2014
- 2014-03-05 CN CN201420097259.8U patent/CN203927879U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103939884A (en) * | 2014-03-05 | 2014-07-23 | 东南大学 | Economizer improving SCR commissioning rate under low load working condition |
| CN104406155A (en) * | 2014-11-27 | 2015-03-11 | 哈尔滨锅炉厂有限责任公司 | Connecting pipe for improving water temperature of coal economizer |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN203927880U (en) | A kind of economizer that improves SCR system underrun denitration ability | |
| CN203944290U (en) | A kind of SCR flue gas denitrification system | |
| CN203862139U (en) | Denitration system for flue | |
| CN204933221U (en) | A kind of denitrating flue gas treatment system in conjunction with distributed system | |
| CN103638805B (en) | A kind of CFB boiler SNCR denitration method for flue gas of dual reducting agents | |
| CN106362590A (en) | Flue gas system and method for raising fume temperature of inlet of SCR (Selective Catalytic Reduction) denitration device | |
| CN203170222U (en) | System for improving running capability of SCR (selective catalytic reduction) denitrating device in power plant | |
| CN103277788A (en) | SCR temperature regulating system of boiler and method for regulating smoke temperature of SCR inlet of boiler | |
| CN106540529A (en) | A kind of gas pollutant integrated treatment unit | |
| CN203771375U (en) | Coal economizer for increasing flue-gas temperature at SCR system entrance | |
| CN203927879U (en) | A kind of economizer that improves SCR operational percentage under running on the lower load | |
| CN203364109U (en) | SCR temperature regulating system of boiler | |
| CN103900073A (en) | Economizer for improving denitrification capacity of SCR system during low-load operation | |
| CN208786167U (en) | A kind of system of the wide load denitration of air water cooperative achievement | |
| CN103939884A (en) | Economizer improving SCR commissioning rate under low load working condition | |
| CN203316011U (en) | Structure for improving coal-fired boiler tail smoke denitration input rate | |
| CN110701631A (en) | System and method for relieving blockage of air preheater through catalytic oxidation of escaped ammonia | |
| CN105889895B (en) | It is a kind of to change area and the type of flow to improve the economizer of SCR inlet smoke temperature | |
| CN203784915U (en) | Working temperature control device of SCR (selective catalytic reduction) denitrification reactor of thermal power plant | |
| CN103900072A (en) | Economizer for improving temperature of smoke in inlet of SCR system | |
| CN203836997U (en) | Various-contaminant high-efficiency cooperative removing integrated system | |
| CN105889899A (en) | Superheated steam temperature adjusting system and method suitable for SCR low-load operation | |
| CN205379806U (en) | Electro -catalysis low temperature wet process full load deNOx systems | |
| CN107051191A (en) | The efficient SCR denitration structures and methods that a kind of achievable full load puts into operation | |
| CN203075835U (en) | Accident spraying system for preventing SCR (Selective Catalytic Reduction) denitration catalyst from overheating |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20141105 |