CN106152165B - A kind of apparatus and method for changing flow of flue gas control SCR inlet smoke temperature - Google Patents
A kind of apparatus and method for changing flow of flue gas control SCR inlet smoke temperature Download PDFInfo
- Publication number
- CN106152165B CN106152165B CN201510109206.2A CN201510109206A CN106152165B CN 106152165 B CN106152165 B CN 106152165B CN 201510109206 A CN201510109206 A CN 201510109206A CN 106152165 B CN106152165 B CN 106152165B
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- Prior art keywords
- roller shutter
- flue gas
- steel
- control
- motor
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 51
- 239000003546 flue gas Substances 0.000 title claims abstract description 51
- 239000000779 smoke Substances 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims abstract description 17
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 60
- 239000010959 steel Substances 0.000 claims abstract description 60
- 230000001105 regulatory effect Effects 0.000 claims abstract description 25
- 230000009471 action Effects 0.000 claims abstract description 6
- 238000005096 rolling process Methods 0.000 claims description 5
- 238000003032 molecular docking Methods 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 2
- 108700018263 Brassica oleracea SCR Proteins 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 5
- 239000007789 gas Substances 0.000 description 5
- 239000003245 coal Substances 0.000 description 4
- 239000003054 catalyst Substances 0.000 description 3
- 230000001276 controlling effect Effects 0.000 description 3
- 230000008676 import Effects 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000006555 catalytic reaction Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 235000019504 cigarettes Nutrition 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000006722 reduction reaction Methods 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/30—Technologies for a more efficient combustion or heat usage
Abstract
The invention discloses a kind of apparatus and method for changing flow of flue gas control SCR inlet smoke temperature, which is made of steel roller shutter, regulating rod, motor and switchgear.The steel roller shutter is made of several pieces of flat steel discs, is connected between steel disc by rotatable pin, and roller shutter one end is free end, and the other end is rolled with the rotation of regulating rod on regulating rod and stretches steel roller shutter；The regulating rod connection gear, rotates under the action of motor；Rotation direction, rotation time and the velocity of rotation of the switchgear control motor.When the inlet flue gas temperature of SCR denitration system is too low, control roller shutter trails, and shield portions heat-transfer surface reduces economizer caloric receptivity, improves SCR inlet smoke temperature, ensures denitrating system normal operation.The present invention solves the problems, such as that coal-burning power plant SCR can not put into operation because smoke temperature is too low.
Description
Technical field
The present invention relates to a kind of apparatus and method for changing flow of flue gas control SCR inlet smoke temperature, belong to coal-burning boiler and subtract
Drainage technique field.
Background technology
With increasingly sharpening for environmental degradation, China has put into effect substantial amounts of energy-saving and emission-reduction measure, and power plant, which stands in the breach, to be become
The important object administered.During " 12th Five-Year Plan ", requirement thermal power generation unit equipment denitrating system in China's controls the discharge of NOx,
Most domestic power plant uses selective catalytic reduction (SCR) flue gas denitrification system.In SCR denitration system operational process, denitration
Catalyst often causes catalytic efficiency low due to smoke temperature is not suitable for, and denitrating system operation is influenced, for this purpose, all multi-experts are to denitrating system
Preceding heat exchanger is transformed.
SCR optimal reaction temperature windows are concentrated mainly on 340~380 DEG C, when inlet flue gas temperature is below 360~380 DEG C,
SCR reaction efficiencies are improved with the raising of temperature.For this phenomenon, presently, there are in economizer feed water by-pass, economizer
Multinomial measure, the economizer such as flue duct bypass, high-temperature flue bypass and economizer hierarchical arrangement are given outside portion's flue duct bypass, economizer
Water bypass reduces the main flow of economizer, so as to reduce economizer caloric receptivity, achievees the purpose that improve SCR inlet smoke temperature；Save coal
Flue duct bypass, high-temperature flue bypass are by controlling economizer exit flue gas and side outside the bypass of device Internal Flue, economizer
The mixed proportion of road flue gas come achieve the purpose that control SCR inlet smoke temperature；Economizer hierarchical arrangement be by reduce flue gas with to
Heat exchange amount between water achievees the purpose that improve SCR inlet smoke temperature.
It also proposed a kind of method for controlling SCR inlet smoke temperature herein, this method is by changing flue gas flow direction, controlling cigarette
The coefficient of heat transfer and heat exchange area between gas and feedwater, so as to control SCR inlet flue-gas temperature.
The content of the invention
It is an object of the invention to control SCR denitration system inlet flue gas temperature, ensure denitrating system normal operation, with economizer
A kind of the problem of to transform object, due to smoke temperature is too low denitrating system being caused to be stopped transport for current coal-burning power plant, it is proposed that change
Flow of flue gas controls the apparatus and method of SCR inlet smoke temperature, to meet existing thermal power plant's pollutant emission standard, reaches environmental protection
It is required that.
The purpose of the present invention is realized by following technical measures：
A kind of apparatus and method for changing flow of flue gas control SCR inlet smoke temperature, it is characterised in that：The device is rolled up by steel
Curtain, regulating rod, motor and switchgear composition.
The control device, along flow of flue gas direction, in economizer both sides arranged for interval, gap size is five layers of pipe
Row.
The steel roller shutter is made of several pieces of steel discs, and steel disc is in flat, and the side of steel disc is welded with annulus, adjacent
The annulus docking of two steel discs is connected by steel pin through annulus, and interface can rotate, and the steel disc after connection is roller shutter,
Roller shutter one end is free end, and the other end is fixed on regulating rod, and with the rotation of regulating rod, roller shutter be free to roll and stretch
Exhibition is connected preferable after roller shutter stretching, extension between steel disc, and seamless, flue gas cannot pass through.
Described regulating rod one end is placed on rotating base, other end welded gear, the gear and another gear phase
Mutually occlusion, gear can rotate under the action of motor, drive regulating rod rotation, so as to control rolling and stretching for steel roller shutter
Exhibition.
The motor is connected with gear, and band moving gear rotates during motor rotation.
The switchgear is connected with motor, can control rotation direction, rotation time and the velocity of rotation of motor,
So as to control the area of steel rolling screen shielding economizer tube wall, the heat exchange amount between flue gas and steam is reduced, controls economizer exit
Flue-gas temperature ensures SCR denitration system normal operation.
The length of the steel roller shutter is the half of flue, prevents the long flue that blocks of roller shutter from causing flue gas normal
Circulation.
Close to hot wall, roller shutter direction of extension can be controlled by having on wall for other two side of the steel roller shutter
Groove, two sides of roller shutter are placed in groove, under the driving of regulating rod, steel roller shutter along groove track forward
Movement.
The motor can under the control of power supply positive and negative rotation, when motor rotates clockwise, control steel
Roller shutter is rolled, and reduces the heat exchange area blocked, and when motor rotated counterclockwise, control steel roller shutter extends, and increase hides
The heat exchange area of gear.
Workflow of the present invention is：When boiler at low load is run, SCR denitration system inlet flue gas temperature reduces, when less than catalysis
During 320 DEG C of agent preference temperature, switchgear power supply is opened, makes motor rotated counterclockwise, band moving gear rotates, and controls to adjust stick edge
It rotates clockwise, under the action of regulating rod, control steel roller shutter extends, and blocks a part of heat exchange area, flue gas is with saving
The heat exchange amount of feedwater is reduced in coal device, the rise of economizer exit smoke temperature, and the rise of denitrating system import smoke temperature ensures that catalyst exists
Normal operation within the temperature range of 320 DEG C to 420 DEG C.Declined according to smoke temperature it is different degrees of, along flow of flue gas direction, successively
The steel roller shutter of economizer both sides is opened, controls the heat exchange area between flue gas and feedwater, so as to control between flue gas and feedwater
Heat exchange amount continuously adjusts denitrating system inlet flue gas temperature, ensures SCR denitration system normal operation.
Description of the drawings
The present invention is described in further detail with specific example below in conjunction with the accompanying drawings：
Fig. 1 is the present invention in coal-burning power plant's back-end ductwork usage state diagram；
Fig. 2 continuously adjusts schematic diagram when being run for boiler at low load, the heat exchange area between flue gas and feedwater is reduced；
Fig. 3 continuously adjusts schematic diagram when being run for boiler at low load, compared with Fig. 2, the heat exchange area between flue gas and feedwater
It is further reduced；
Fig. 4 continuously adjusts schematic diagram when being run for boiler at low load, compared with Fig. 3, the heat exchange area between flue gas and feedwater
It is further reduced；
Fig. 5 is a whole set of control device；
Fig. 6 is steel roller shutter.
Reference sign,
1- economizer exit headers, 2- economizer import headers, 3- economizers, 4-SCR denitrating systems, 5,7- economizers it is left
Side steel roller shutter, steel roller shutter on the right side of 6- economizers, 8- motor, 9,11- gears, 10- universal driving shafts, 12- regulating rods, 13- bottoms
Seat, 14- roller shutter head ends, 15- roller shutters end, 16,17- roller shutters side, A- not by sweep of gases area, B- not by sweep of gases area,
C- is not by sweep of gases area.
Specific embodiment
The present invention is further illustrated with reference to the accompanying drawings and detailed description, but the present invention be not limited to it is following
Embodiment.Boiler can be all models formula, it is illustrated that by taking Π type boilers as an example, but the actual not merely limitation diagram type of furnace.
This paper presents a kind of apparatus and method for changing flow of flue gas control SCR inlet smoke temperature, arrange after-burning of the present invention
Coal-fired plant's back-end ductwork equipment state is as shown in Figure 1, control device is made of steel roller shutter, regulating rod, motor and switchgear.
The system has several set control devices, and along flow of flue gas direction, in economizer both sides arranged for interval, gap size is five layers of pipe
Row.
Steel roller shutter in the present embodiment is made of several pieces of steel discs, and steel disc is in flat, and the side of steel disc is welded with circle
Ring, the annulus docking of two neighboring steel disc are connected by steel pin through annulus, and interface can rotate, and the steel disc after connection is
For roller shutter, roller shutter one end is free end, and the other end is fixed on regulating rod, and with the rotation of regulating rod, roller shutter be free to
It rolls and stretches, be connected preferable between steel disc after roller shutter stretching, extension, seamless, flue gas cannot pass through.
Regulating rod one end in the present embodiment is placed on rotating base, other end welded gear, the gear and another
Gear is mutually twisted, and gear can rotate under the action of motor, regulating rod rotation is driven, so as to control the volume of steel roller shutter
It rises and stretches.
Motor in the present embodiment is connected with gear, and band moving gear rotates during motor rotation.
Switchgear in the present embodiment is connected with motor, can control the rotation direction of motor, rotation time and turn
Dynamic speed so as to control the area of steel rolling screen shielding economizer tube wall, reduces the heat exchange amount between flue gas and steam, and control saves coal
Device exit gas temperature ensures SCR denitration system normal operation.
The length of steel roller shutter in the present embodiment is the half of flue, prevents the long flue that blocks of roller shutter from causing flue gas not
It can normally circulate.Close to hot wall, roller shutter direction of extension can be controlled by having on wall for other two side of steel roller shutter
Groove, two sides of roller shutter are placed in groove, under the driving of regulating rod, steel roller shutter along groove track forward
Movement.
Motor in the present embodiment can under the control of power supply positive and negative rotation, when motor rotates clockwise, control
Steel roller shutter processed is rolled, and reduces the heat exchange area blocked, and when motor rotated counterclockwise, control steel roller shutter extends,
Increase the heat exchange area blocked.
Workflow of the present invention is：When boiler at low load is run, SCR denitration system inlet flue gas temperature reduces, when less than catalysis
During 320 DEG C of agent preference temperature, switchgear power supply is opened, makes motor rotated counterclockwise, band moving gear rotates, and controls to adjust stick edge
It rotates clockwise, under the action of regulating rod, control steel roller shutter extends, and blocks a part of heat exchange area, flue gas is with saving
The heat exchange amount of feedwater is reduced in coal device, the rise of economizer exit smoke temperature, and the rise of denitrating system import smoke temperature ensures that catalyst exists
Normal operation within the temperature range of 320 DEG C to 420 DEG C.Declined according to smoke temperature it is different degrees of, along flow of flue gas direction, successively
The steel roller shutter of economizer both sides is opened, controls the heat exchange area between flue gas and feedwater, so as to control between flue gas and feedwater
Heat exchange amount continuously adjusts denitrating system inlet flue gas temperature, ensures SCR denitration system normal operation.
The present invention do not limit to above-mentioned specific embodiment, according to the above, according to the ordinary technical knowledge of this field
And customary means, under the premise of the above-mentioned basic fundamental thought of the present invention is not departed from, the present invention can also make other diversified forms
Equivalent modifications, replacement or change, all fall among protection scope of the present invention.
Claims (6)
1. a kind of apparatus and method for changing flow of flue gas control SCR inlet smoke temperature, it is characterised in that：The device is rolled up by steel
Curtain, regulating rod, motor and switchgear composition；The steel roller shutter is made of several pieces of steel discs, and steel disc is in flat, steel disc
Side be welded with annulus, the annulus docking of two neighboring steel disc, by steel pin through annulus connection, interface can rotate,
Steel disc after connection is roller shutter, and roller shutter one end is free end, and the other end is fixed on regulating rod, with the rotation of regulating rod,
Roller shutter be free to roll and stretch, and be connected preferable between steel disc after roller shutter stretching, extension, seamless, flue gas cannot pass through；It is described
Regulating rod one end be placed on rotating base, other end welded gear, the gear is mutually twisted with another gear, electronic
Gear can rotate under the action of machine, drive regulating rod rotation, so as to control rolling and stretching for steel roller shutter；Described is electronic
Machine can under the control of power supply positive and negative rotation, when motor rotates clockwise, control steel roller shutter roll, reduce what is blocked
Heat exchange area, when motor rotated counterclockwise, control steel roller shutter extends, and increases the heat exchange area blocked.
2. the apparatus and method according to claim 1 for changing flow of flue gas control SCR inlet smoke temperature, it is characterised in that：
The control device, along flow of flue gas direction, in economizer both sides arranged for interval, gap size is arranged for five layers of pipe.
3. the apparatus and method according to claim 1 for changing flow of flue gas control SCR inlet smoke temperature, it is characterised in that：
The motor is connected with gear, and band moving gear rotates during motor rotation.
4. the apparatus and method according to claim 1 for changing flow of flue gas control SCR inlet smoke temperature, it is characterised in that：
The switchgear is connected with motor, rotation direction, rotation time and the velocity of rotation of motor can be controlled, so as to control
The area of steel rolling screen shielding economizer tube wall reduces the heat exchange amount between flue gas and steam, controls economizer exit flue-gas temperature,
Ensure SCR denitration system normal operation.
5. the apparatus and method according to claim 2 for changing flow of flue gas control SCR inlet smoke temperature, it is characterised in that：
The length of the steel roller shutter is the half of flue, prevents the long flue that blocks of roller shutter from causing flue gas that cannot normally circulate.
6. the apparatus and method according to claim 2 for changing flow of flue gas control SCR inlet smoke temperature, it is characterised in that：
There is the groove that can control roller shutter direction of extension in other two side of the steel roller shutter close to hot wall on wall,
Two sides of roller shutter are placed in groove, and under the driving of regulating rod, steel roller shutter travels forward along the track of groove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510109206.2A CN106152165B (en) | 2015-03-13 | 2015-03-13 | A kind of apparatus and method for changing flow of flue gas control SCR inlet smoke temperature |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510109206.2A CN106152165B (en) | 2015-03-13 | 2015-03-13 | A kind of apparatus and method for changing flow of flue gas control SCR inlet smoke temperature |
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| Publication Number | Publication Date |
|---|---|
| CN106152165A CN106152165A (en) | 2016-11-23 |
| CN106152165B true CN106152165B (en) | 2018-05-22 |
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| CN201510109206.2A Expired - Fee Related CN106152165B (en) | 2015-03-13 | 2015-03-13 | A kind of apparatus and method for changing flow of flue gas control SCR inlet smoke temperature |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1533490A (en) * | 2000-12-20 | 2004-09-29 | Ͳ | Boiler internal flue gas by-pass regulator for flue gas temperature control |
| JP2010175152A (en) * | 2009-01-29 | 2010-08-12 | Mitsubishi Heavy Ind Ltd | Protector structure for boiler heat transfer tube |
| CN201593934U (en) * | 2010-01-26 | 2010-09-29 | 宁波市北仑银海机械制造有限公司 | Adjustable plate-type heat exchanger |
| JP2012199148A (en) * | 2011-03-22 | 2012-10-18 | Toyota Industries Corp | Battery temperature controller |
-
2015
- 2015-03-13 CN CN201510109206.2A patent/CN106152165B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1533490A (en) * | 2000-12-20 | 2004-09-29 | Ͳ | Boiler internal flue gas by-pass regulator for flue gas temperature control |
| JP2010175152A (en) * | 2009-01-29 | 2010-08-12 | Mitsubishi Heavy Ind Ltd | Protector structure for boiler heat transfer tube |
| CN201593934U (en) * | 2010-01-26 | 2010-09-29 | 宁波市北仑银海机械制造有限公司 | Adjustable plate-type heat exchanger |
| JP2012199148A (en) * | 2011-03-22 | 2012-10-18 | Toyota Industries Corp | Battery temperature controller |
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| Publication number | Publication date |
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| CN106152165A (en) | 2016-11-23 |
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