CN104482527B - Ensure the adjustment system and method for the boiler economizer heating surface heat exchange area of SCR safe cigarette temperature - Google Patents
Ensure the adjustment system and method for the boiler economizer heating surface heat exchange area of SCR safe cigarette temperature Download PDFInfo
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- CN104482527B CN104482527B CN201410755680.8A CN201410755680A CN104482527B CN 104482527 B CN104482527 B CN 104482527B CN 201410755680 A CN201410755680 A CN 201410755680A CN 104482527 B CN104482527 B CN 104482527B
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Abstract
The invention discloses the adjustment system and method for the boiler economizer heating surface heat exchange area ensureing SCR safe cigarette temperature, this adjustment system includes electric magnet, iron slide block, spacer pin and control device, described electric magnet, iron slide block and spacer pin are multiple, each electric magnet is all connected with described control device, control device and control the electric current of electric magnet, thus controlling the electromagnetic force that electric magnet produces, described iron slide block set is contained in economizer tube panel on the straight length of horizontally set, it is within the scope of the magnetic force of electric magnet, described spacer pin is welded on the bottom of the straight length equipped with iron slide block, the welding position of spacer pin is the limit point place of iron slide block, iron slide block on same straight length stops when touching spacer pin in sliding process. this adjustment system can solve the problem that fibre selection problem, it is ensured that the safe operation of follow-up SCR denitration system, to meet existing thermal power plant's pollutant emission standard. the present invention discloses its control method.
Description
Technical field
The invention belongs to coal-burning boiler emission-reduction technology, specifically refer to ensure the adjustment system and method for the boiler economizer heating surface heat exchange area of SCR safe cigarette temperature.
Background technology
Along with the fast development of China's economy, the installed capacity of fired power generating unit is increasing, and coal consumption also increases day by day, and thing followed pollution problem also increasingly sharpens, and the discharged nitrous oxides of coal-burning power plant has become the emphasis direction of China's control of sewage disposal. The main selective catalytic reduction method (SCR) of gas denitrifying technology of China and SNCR method (SNCR), wherein selective catalytic reduction (SCR) is that technology is the most ripe in the world at present, apply maximum denitrating techniques.
The performance of catalyst directly affects the denitration efficiency that power plant is overall, decides the operating cost of SCR, and flue-gas temperature is to affect the key factor that catalyst runs, and not only decides the response speed of reactant, and decides reactivity and the life-span of catalyst. When cigarette temperature is higher than the preference temperature of catalyst, catalyst channels and micropore can deform, and cause effective passage and area to reduce, so that catalysqt deactivation. When flue-gas temperature is lower than the preference temperature of catalyst, can there is side reaction in catalyst, make NH3 and SO3 and H2O react, and product sticks to catalyst surface, reduces catalysis activity. Therefore, it is necessary to control flue-gas temperature, make SCR denitration system properly functioning.
For the problems referred to above, the control cigarette temperature measure adopted at present has the outside flue duct bypass of the bypass of economizer feed water by-pass, economizer Internal Flue, economizer, high-temperature flue bypass and economizer hierarchical arrangement etc., present invention also proposes a kind of boiler heating surface heat exchange area ensureing SCR safe cigarette temperature and regulates System and method for.
Summary of the invention
An object of the present invention is to provide the adjustment system of the boiler economizer heating surface heat exchange area ensureing SCR safe cigarette temperature, this adjustment system can solve the problem that fibre selection problem, ensure the safe operation of follow-up SCR denitration system, to meet existing thermal power plant's pollutant emission standard, meet the requirement of environmental protection.
The above-mentioned purpose of the present invention realizes by following technical solution: ensure the adjustment system of the boiler economizer heating surface heat exchange area of SCR safe cigarette temperature, it is characterized in that: described adjustment system includes electric magnet, iron slide block, spacer pin and control device, described electric magnet, iron slide block and spacer pin are multiple, wherein, described electric magnet symmetrically shape is vertically attached on the front-back wall of boiler economizer tube panel, each electric magnet is all connected with described control device, control device and control the electric current of electric magnet, thus controlling the electromagnetic force that electric magnet produces, described iron slide block set is contained in economizer tube panel on the straight length of horizontally set, it is within the scope of the magnetic force of electric magnet, iron slide block can slide along the straight length of economizer under electric magnet magneticaction, described spacer pin is welded on the bottom of the straight length equipped with iron slide block, the welding position of spacer pin is the limit point place of iron slide block, iron slide block on same straight length stops when touching spacer pin in sliding process, adjacent and be sleeved on the iron slide block of lower section straight length in sliding process not be welded on above the spacer pin of straight length touch mutually, described adjustment system is by controlling device, electric magnet and spacer pin regulate iron slide block and are in the diverse location of economizer straight length, thus changing the heat exchange area of flue gas and economizer surface, improve the temperature of economizer exit flue gas, ensure the properly functioning of follow-up SCR denitration system.
In the present invention, described electric magnet, iron slide block and the complete setting of spacer pin, electric magnet in every suit is four pieces, wherein two pieces are attached on the front wall of boiler economizer tube panel in upper and lower shape, other two pieces are attached on the rear wall of boiler economizer tube panel in upper and lower shape, iron slide block is five pieces, it is set on five sections of straight lengths of continuous print neighbouring in economizer tube panel, spacer pin is also five, be respectively welded at the bottom of five sections of straight lengths corresponding to five pieces of iron slide blocks, neighbouring spacer pin between left and right from equal with the length of iron slide block.
In the present invention, described electric magnet is cuboid. Electric magnet is set to rectangular shape by the present invention, along flow of flue gas direction, often organize horizontally disposed a pair electric magnet in both sides of pipe, the electromagnet current of both sides can be controlled by switch cubicle, thus controlling the electromagnetic force that electric magnet produces, under different electromagnetic forces, slide block is promoted to slide to corresponding limit point.
In the present invention, described iron slide block is cuboid, and the length of iron slide block is 15cm.
In the present invention, there is between width and the economizer of described iron slide block the transverse pitch of 2-3mm, there is between height and the economizer of iron slide block the longitudinal pitch of 2-3mm, avoid flue gas to pass through between iron slide block as far as possible.
Electric magnet is arranged on the front-back wall of economizer tube panel by the present invention, and electric magnet is connected by circuit with switch cubicle; Switch cubicle is built with the control device controlling electromagnet current and voltage; Iron slide block is divided into some groups, and often group is made up of five row's slide blocks, is respectively fitted on the tube panel of economizer, and every section of straight tube is cased with a slide block, and often group slide block is by corresponding magnet control, it is possible to along economizer pipeline direction slidably; Spacer pin is welded on the limit point place of pipe, is positioned at the bottom of pipe, it is prevented that sweep of gases spacer pin, and neighbouring spacer pin is between left and right from for its length.
The present invention is by controlling electric current and the magnitude of voltage of switch cubicle, thus controlling the electromagnetic force of electric magnet, under different electromagnetic forces, iron slide block is made to slide to corresponding limit point, thus the heat exchange area changed between flue gas and economizer tube wall, improve economizer exit flue-gas temperature, it is ensured that SCR denitration system properly functioning.
In the process of adjusting slider, the slide block shift position on same level bank of tubes to ensure equal, and owing to gaE slide is little, flue gas leakage current between slide block can be ignored, and flow of flue gas is limited mainly by the impact of slide block flow-disturbing, and the pipe area of shield portions is not by sweep of gases.
Workflow of the present invention is: when boiler at low load runs, SCR denitration system inlet flue gas temperature reduces, when lower than catalyst preference temperature, along flow of flue gas direction, strengthen the electric current of each switch cubicle on the left of pipe successively, slide block is made to move to centre successively, it is subject to the effect of spacer pin, slide block is blocked in limit point place, thus ensure to be connected with each other between upper sliding block, it is unlikely to flue gas to reveal between slide block, flue gas circulation area is gradually reduced, heat exchange amount between flue gas and economizer tube wall also gradually decreases, economizer exit cigarette temperature rise, denitrating system import cigarette temperature rise, ensure that catalyst is properly functioning in suitable temperature range. declining in various degree according to cigarette temperature, controlling the circulation area of flue gas, thus continuously adjusting denitrating system inlet flue gas temperature.
The two of the purpose of the present invention are to provide the control method of the boiler economizer heating surface heat exchange area ensureing SCR safe cigarette temperature, and the method is easy to operate, and the adjustment result of the satisfaction obtained.
The above-mentioned purpose of the present invention realizes by following technical solution: ensure the control method of the boiler economizer heating surface heat exchange area of SCR safe cigarette temperature, it is characterised in that the method comprises the steps:
(1) on the front-back wall of boiler economizer tube panel, symmetrically shape vertically attaches electric magnet, and is connected with the control device being arranged in switch cubicle each through electric wire by each electric magnet, controls, by controlling device, the electromagnetic force that electric magnet produces;
(2) being set with iron slide block in economizer tube panel on the straight length of horizontally set, iron slide block is within the scope of the magnetic force of electric magnet, can slide along the straight length of economizer under electric magnet magneticaction;
(3) it is welded with spacer pin in the bottom correspondence of the straight length equipped with iron slide block, the welding position of spacer pin is the limit point place of iron slide block, stop when iron slide block on same straight length touches spacer pin in sliding process, adjacent and be sleeved on the iron slide block of lower section straight length in sliding process not be welded on above the spacer pin of straight length touch mutually;
(4) regulate iron slide block be in the diverse location of economizer straight length by control device, electric magnet and spacer pin, thus changing the heat exchange area of flue gas and economizer surface, improve the temperature of economizer exit flue gas, it is ensured that follow-up SCR denitration system properly functioning.
Accompanying drawing explanation
Below in conjunction with accompanying drawing and instantiation, the present invention is described in further detail:
Fig. 1 is the use state diagram that the present invention regulates that system is arranged in coal-burning power plant's back-end ductwork;
Fig. 2 is that the present invention regulates the system adjustment schematic diagram when boiler at low load runs, and now the circulation area of flue gas reduces;
Fig. 3 is that the present invention regulates the system adjustment schematic diagram when boiler at low load runs, and compared with Fig. 2, now the circulation area of flue gas reduces further;
Fig. 4 is that the present invention regulates the system adjustment schematic diagram when boiler at low load runs, and compared with Fig. 3, now the circulation area of flue gas reduces further;
Fig. 5 is the part drawing of iron slide block in adjustment system of the present invention.
Description of reference numerals,
1-economizer exit header, 2-economizer import header, 3-economizer, 31-straight length, 4-SCR denitrating system, 5,7,9-be positioned at the electric magnet on the left of economizer, 6,8,10-be positioned at the electric magnet on the right side of economizer, the iron slide block of 11-, 11a-slide opening, 12-spacer pin, a-length, b-width, c-is high, A-is not by sweep of gases area, and B-is not by sweep of gases area, and C-is not by sweep of gases area.
Detailed description of the invention
The adjustment system of the boiler economizer heating surface heat exchange area of guarantee SCR safe cigarette temperature as shown in Figures 1 to 5, boiler can be the boiler of all models formula, economizer 3 is arranged in coal-burning power plant's back-end ductwork, enters SCR denitration system 4 from economizer 3 flue gas out. This adjustment system includes some electric magnet, iron slide block 11 and spacer pin 12 and switch cubicle, is provided with control device in switch cubicle.
Electric magnet in the present embodiment, iron slide block 11 and the complete setting of spacer pin 12, electric magnet is cuboid, iron slide block 11 is cuboid, iron slide block 11 has the slider bore 11a of suit straight length 31, the long a of iron slide block 11 is 15cm, electric magnet symmetrically shape is vertically attached on the front-back wall of boiler economizer 3 tube panel, each electric magnet is all connected with control device, control device and control the electric current of electric magnet, thus controlling the electromagnetic force that electric magnet produces, electric magnet in every suit is four pieces, wherein two pieces are attached on the front wall of boiler economizer 3 tube panel in upper and lower shape, other two pieces are attached on the rear wall of boiler economizer 3 tube panel in upper and lower shape, iron slide block 11 is five pieces, it is set on five sections of straight lengths 31 of continuous print of horizontally set neighbouring in economizer 3 tube panel, it is within the scope of the magnetic force of electric magnet, iron slide block 11 can slide along the straight length 31 of economizer 3 under electric magnet magneticaction, spacer pin 12 is also five, it is respectively welded at five sections of bottoms equipped with the straight length 31 of iron slide block 11 corresponding to five pieces of iron slide blocks 11, the welding position of spacer pin 12 is the limit point place of iron slide block 11, iron slide block 11 on same straight length 31 stops when touching spacer pin 12 in sliding process, adjacent and be sleeved on lower section straight length 31 iron slide block 11 in sliding process not be welded on above straight length 31 spacer pin 12 phase touching, neighbouring spacer pin 12 between left and right from equal with the length of iron slide block 11.
The adjustment system of the present embodiment regulates iron slide block 11 be in the diverse location of economizer 3 straight length 31 by controlling device, electric magnet and spacer pin 12, thus changing the heat exchange area of flue gas and economizer 3 heating surface, improve the temperature of economizer 3 exiting flue gas, it is ensured that follow-up SCR denitration system properly functioning.
The present embodiment is arranged on the front-back wall of economizer 3 tube panel by electric magnet, and electric magnet is connected (not shown in FIG.) with switch cubicle by circuit; Switch cubicle is built with the control device controlling electromagnet current and voltage; Iron slide block is divided into some groups, often group is made up of the five iron slide blocks of row, it is respectively fitted on the tube panel 3 of economizer, every section of straight tube is cased with an iron slide block, often organize iron slide block to be controlled by corresponding electric magnet (in Fig. 1 shown in 5,6,7,8,9,10), it is possible to along economizer pipeline direction slidably; Spacer pin 12 is welded on the limit point place of pipe, is positioned at the bottom of pipe, thus preventing sweep of gases spacer pin, neighbouring spacer pin is between left and right from for iron its length.
In the present embodiment, there is between the wide and economizer 3 of iron slide block 11 transverse pitch of 2-3mm, there is between height and the economizer 3 of iron slide block 11 longitudinal pitch of 2-3mm, avoid flue gas to pass through between iron slide block 11 as far as possible.
Electric magnet is rectangular shape, along flow of flue gas direction, horizontally disposed a pair electric magnet in both sides (in Fig. 1 shown in 5,6) of every five combs, the electromagnet current of both sides can be controlled by switch cubicle, thus controlling the electromagnetic force that electric magnet produces, under different electromagnetic forces, iron slide block is promoted to slide to corresponding limit point, as shown in Figure 2.
The present embodiment is by controlling electric current and the magnitude of voltage of switch cubicle, thus controlling the electromagnetic force of electric magnet 5,6, under different electromagnetic forces, iron slide block 11 is made to slide to corresponding limit point 12, thus the heat exchange area changed between flue gas and economizer 3 tube wall, improve economizer 3 exit gas temperature, thus ensureing the properly functioning of SCR denitration system 4.
In the process regulating iron slide block, iron slide block shift position on same level bank of tubes to ensure equal, and owing to iron gaE slide is little, flue gas leakage current between iron slide block can be ignored, flow of flue gas is limited mainly by the impact of iron slide block flow-disturbing, and the pipe area of shield portions is not by sweep of gases.
When boiler at low load runs, the inlet flue gas temperature of SCR denitration system 4 reduces, properly functioning for ensureing denitrating system 4, take following measure: along flow of flue gas direction, strengthen the switch cubicle electric current on the left of first group of economizer pipe, iron slide block 11 is made to move to centre, it is subject to the effect of spacer pin 12, iron slide block 11 is blocked in limit point place, as shown in Figure 2, flue gas is stopped by iron slide block, circulation area is gradually reduced, heat exchange amount between flue gas and economizer 3 tube wall also gradually decreases, economizer 3 exports cigarette temperature rise, denitrating system 4 import cigarette temperature rise, ensure that catalyst is properly functioning in suitable temperature range. declining in various degree according to cigarette temperature, controlling iron slide position as it is shown on figure 3, thus the circulation area of flue gas reduces further, economizer 3 exports cigarette temperature and raises further, and denitrating system 4 import cigarette temperature also raises, thus continuously adjusting denitrating system 4 inlet flue gas temperature, continuously adjust cigarette temperature process as shown in Figure 2,3, 4, do not increased to A by sweep of gases area from a-quadrant and add B region, finally increase to A and add B and add C region, be connected with each other between upper and lower iron slide block, flue gas is along iron slide block flow-disturbing, thus ensureing that flue gas is unlikely to wash away tube wall.
Conversion as the present embodiment, electric magnet in adjustment system, iron slide block 11 and spacer pin 12 all can arrange multiple or many sets or many groups according to actual needs, the electric magnet of each group or every suit, the quantity of iron slide block 11 and spacer pin 12 can also be determined according to actual needs, usual iron slide block 11 is identical with the quantity of spacer pin 12, and both of which is arranged on same straight length of economizer, wherein, electric magnet symmetrically shape is vertically attached on the front-back wall of boiler economizer 3 tube panel, each electric magnet is all connected with control device, control device and control the electric current of electric magnet, thus controlling the electromagnetic force that electric magnet produces, iron slide block 11 is sleeved in economizer 3 tube panel on the straight length of horizontally set, it is within the scope of the magnetic force of electric magnet, iron slide block can slide along the straight length of economizer under electric magnet magneticaction, spacer pin is welded on the bottom of the straight length equipped with iron slide block, the welding position of spacer pin is the limit point place of iron slide block, iron slide block on same straight length stops when touching spacer pin in sliding process, adjacent and be sleeved on the iron slide block of lower section straight length in sliding process not be welded on above the spacer pin of straight length touch mutually.
Conversion as the present embodiment, transverse pitch S1 between wide b and the economizer of iron slide block can at 2-3mm, the high c of iron slide block and the longitudinal pitch S2 of economizer can also in 2-3mm value, the slide block joint being connected between pipe is comparatively tight, prevent flue gas from passing through between slide block, avoid flue gas to pass through between iron slide block as far as possible.
Invention also provides the control method of the boiler economizer heating surface heat exchange area ensureing SCR safe cigarette temperature, the method comprises the steps:
(1) on the front-back wall of boiler economizer tube panel, symmetrically shape vertically attaches electric magnet, and is connected with the control device being arranged in switch cubicle each through electric wire by each electric magnet, controls, by controlling device, the electromagnetic force that electric magnet produces;
(2) being set with iron slide block in economizer tube panel on the straight length of horizontally set, iron slide block is within the scope of the magnetic force of electric magnet, can slide along the straight length of economizer under electric magnet magneticaction;
(3) it is welded with spacer pin in the bottom correspondence of the straight length equipped with iron slide block, the welding position of spacer pin is the limit point place of iron slide block, stop when iron slide block on same straight length touches spacer pin in sliding process, adjacent and be sleeved on the iron slide block of lower section straight length in sliding process not be welded on above the spacer pin of straight length touch mutually;
(4) regulate iron slide block be in the diverse location of economizer straight length by control device, electric magnet and spacer pin, thus changing the heat exchange area of flue gas and economizer surface, improve the temperature of economizer exit flue gas, it is ensured that follow-up SCR denitration system properly functioning.
The above embodiment of the present invention is not limiting the scope of the present invention; embodiments of the present invention are not limited to this; all this kind foregoing according to the present invention; ordinary technical knowledge and customary means according to this area; without departing under the above-mentioned basic fundamental thought premise of the present invention; to the amendment of other various ways that said structure of the present invention is made, replacement or change, all should drop within protection scope of the present invention.
Claims (6)
1. ensure the adjustment system of the boiler economizer heating surface heat exchange area of SCR safe cigarette temperature, it is characterized in that: described adjustment system includes electric magnet, iron slide block, spacer pin and control device, described electric magnet, iron slide block and spacer pin are multiple, wherein, described electric magnet symmetrically shape is vertically attached on the front-back wall of boiler economizer tube panel, each electric magnet is all connected with described control device, control device and control the electric current of electric magnet, thus controlling the electromagnetic force that electric magnet produces, described iron slide block set is contained in economizer tube panel on the straight length of horizontally set, it is within the scope of the magnetic force of electric magnet, iron slide block can slide along the straight length of economizer under electric magnet magneticaction, described spacer pin is welded on the bottom of the straight length equipped with iron slide block, the welding position of spacer pin is the limit point place of iron slide block, iron slide block on same straight length stops when touching spacer pin in sliding process, adjacent and be sleeved on the iron slide block of lower section straight length in sliding process not be welded on above the spacer pin of straight length touch mutually, described adjustment system is by controlling device, electric magnet and spacer pin regulate iron slide block and are in the diverse location of economizer straight length, thus changing the heat exchange area of flue gas and economizer surface, improve the temperature of economizer exit flue gas, ensure the properly functioning of follow-up SCR denitration system.
2. the adjustment system of the boiler economizer heating surface heat exchange area of guarantee SCR safe cigarette temperature according to claim 1, it is characterized in that: described electric magnet, iron slide block and the complete setting of spacer pin, electric magnet in every suit is four pieces, wherein two pieces are attached on the front wall of boiler economizer tube panel in upper and lower shape, other two pieces are attached on the rear wall of boiler economizer tube panel in upper and lower shape, iron slide block is five pieces, it is set on five sections of straight lengths of continuous print neighbouring in economizer tube panel, spacer pin is also five, the bottom of five sections of straight lengths it is respectively welded at corresponding to five pieces of iron slide blocks, neighbouring spacer pin between left and right from equal with the length of iron slide block.
3. the adjustment system of the boiler economizer heating surface heat exchange area of guarantee SCR safe cigarette temperature according to claim 2, it is characterised in that: described electric magnet is cuboid.
4. the adjustment system of the boiler economizer heating surface heat exchange area of guarantee SCR safe cigarette temperature according to claim 2, it is characterised in that: described iron slide block is cuboid, and the length of iron slide block is 15cm.
5. the adjustment system of the boiler economizer heating surface heat exchange area of guarantee SCR safe cigarette temperature according to claim 4, it is characterized in that: there is between width and the economizer of described iron slide block the transverse pitch of 2-3mm, there is between height and the economizer of iron slide block the longitudinal pitch of 2-3mm, avoid flue gas to pass through between iron slide block as far as possible.
6. ensure the control method of the boiler economizer heating surface heat exchange area of SCR safe cigarette temperature, it is characterised in that the method comprises the steps:
(1) on the front-back wall of boiler economizer tube panel, symmetrically shape vertically attaches electric magnet, and is connected with the control device being arranged in switch cubicle each through electric wire by each electric magnet, controls, by controlling device, the electromagnetic force that electric magnet produces;
(2) being set with iron slide block in economizer tube panel on the straight length of horizontally set, iron slide block is within the scope of the magnetic force of electric magnet, can slide along the straight length of economizer under electric magnet magneticaction;
(3) it is welded with spacer pin in the bottom correspondence of the straight length equipped with iron slide block, the welding position of spacer pin is the limit point place of iron slide block, stop when iron slide block on same straight length touches spacer pin in sliding process, adjacent and be sleeved on the iron slide block of lower section straight length in sliding process not be welded on above the spacer pin of straight length touch mutually;
(4) regulate iron slide block be in the diverse location of economizer straight length by control device, electric magnet and spacer pin, thus changing the heat exchange area of flue gas and economizer surface, improve the temperature of economizer exit flue gas, it is ensured that follow-up SCR denitration system properly functioning.
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| CN105546562A (en) * | 2016-01-29 | 2016-05-04 | 上海久试电力技术有限公司 | Flue and control method for controlling smoke temperature and improvement method for flue |
| CN106547286A (en) * | 2016-12-26 | 2017-03-29 | 北京神雾环境能源科技集团股份有限公司 | flue gas SCR denitration intelligent temperature control device |
| CN110319452B (en) * | 2019-07-05 | 2021-09-10 | 中节能(盘锦)清洁技术发展有限公司 | Boiler flue gas temperature adjusting device and method |
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| JP2009097794A (en) * | 2007-10-17 | 2009-05-07 | Ihi Plant Construction Co Ltd | Cryogenic liquid heating method and its device |
| CN102913896A (en) * | 2012-11-20 | 2013-02-06 | 上海锅炉厂有限公司 | Coal economizer for power station boiler |
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| JPS5710099A (en) * | 1980-06-20 | 1982-01-19 | Chiyoda Chem Eng & Constr Co Ltd | Regulator for fluid outlet temperature of heat exchanger |
| US5101640A (en) * | 1989-12-01 | 1992-04-07 | Hitachi, Ltd. | Air conditioning apparatus, heat exchanger for use in the apparatus and apparatus control method |
| JPH06323762A (en) * | 1993-05-10 | 1994-11-25 | Medeisu Kk | Heat exchanger |
| JP2009097794A (en) * | 2007-10-17 | 2009-05-07 | Ihi Plant Construction Co Ltd | Cryogenic liquid heating method and its device |
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