CN102937296A - Boiler suitable for denitration device negative whole process load operation - Google Patents
Boiler suitable for denitration device negative whole process load operation Download PDFInfo
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- CN102937296A CN102937296A CN2012104733549A CN201210473354A CN102937296A CN 102937296 A CN102937296 A CN 102937296A CN 2012104733549 A CN2012104733549 A CN 2012104733549A CN 201210473354 A CN201210473354 A CN 201210473354A CN 102937296 A CN102937296 A CN 102937296A
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- 238000000034 method Methods 0.000 title abstract description 5
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 38
- 239000003546 flue gas Substances 0.000 claims abstract description 38
- 238000010438 heat treatment Methods 0.000 claims abstract description 9
- 238000002485 combustion reaction Methods 0.000 claims abstract description 5
- 235000014171 carbonated beverage Nutrition 0.000 claims description 19
- 239000007789 gas Substances 0.000 claims description 7
- 238000009529 body temperature measurement Methods 0.000 claims description 6
- 238000013459 approach Methods 0.000 claims description 4
- 235000019504 cigarettes Nutrition 0.000 claims description 4
- 239000003517 fume Substances 0.000 claims description 2
- 239000003054 catalyst Substances 0.000 abstract description 4
- 238000006243 chemical reaction Methods 0.000 abstract description 4
- 238000010531 catalytic reduction reaction Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 8
- 230000002411 adverse Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000008676 import Effects 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention discloses a boiler suitable for denitration device negative whole process load operation. The boiler is characterized in that an economizer, a selective catalytic reduction (SCR) device (2) and an air pre-heater (3) are distributed in a flue, the economizer is divided into a front stage economizer (1) and a rear stage economizer (6) in terms of the flue gas side, and after the flue gas generated by boiler combustion passes through other heating surfaces of a boiler body, the flue gas firstly passes through the front stage economizer and the rear stage economizer, then enters into the SCR device (2) through a flue (4) connected with the SCR device and finally enters into the air pre-heater (3) through a air pre-heater entrance flue (5). By means of the boiler, the temperature of the flue gas entering into the SCR device is always higher than the reaction temperature required by the catalyst under all loads.
Description
Technical field
The present invention relates to the boiler plant field, the boiler that the negative omnidistance load of especially a kind of applicable denitration device puts into operation.
Background technology
Along with the pay attention to day by day of country to environmental protection, in order to ensure the discharge index of final NOx, when adopting low NOx combustion equipment, denitration device has become one of standard configuration of boiler from now on.In conventional boiler design, if adopt the SCR(SCR) the denitration mode, denitrification apparatus is usually placed in the outlet of boiler heating surface, the entrance of air preheater.But in order to guarantee that boiler can reach higher efficiency simultaneously, usually the flue-gas temperature of air preheater is 350 ~ 400 ℃ of left and right at full capacity the time, and under high load capacity, this flue-gas temperature can meet the requirement that puts into operation of SCR equipment.But along with the reduction of load, the flue-gas temperature of process SCR equipment also decreases, if lower than a certain temperature (as 315 ℃, SCR equipment is seen in specific requirement), the catalyst in SCR equipment just can't be worked, and therefore can't play the effect of de-NOx.If the flue-gas temperature full load of guaranteeing to enter SCR equipment meets the reaction temperature of catalyst, the flue-gas temperature that enters SCR equipment at full capacity the time will be far above conventional value, equally because flue gas does not produce significantly temperature drop substantially through SCR equipment, so high flue-gas temperature enters air preheater and can't use the material of original air preheater first, second only by air preheater, can't meet the requirement of conventional exhaust gas temperature, cause the increase of boiler exhaust gas loss.
Summary of the invention
The purpose of this invention is to provide the boiler that the negative omnidistance load of a kind of applicable denitration device puts into operation, make the SCR equipment under omnidistance load condition can both denitration.Technical scheme is as follows:
The boiler that the negative omnidistance load of a kind of applicable denitration device puts into operation, described boiler is furnished with economizer, SCR equipment, air preheater in flue; Described economizer, from fume side, is divided into prime economizer and rear class economizer;
Flue gas after boiler combustion, after other heating surfaces through boiler body, first passes through forward and backward level economizer, then by the flue be connected with SCR equipment, enters SCR equipment, finally by the air preheater gas approach, enters air preheater.
Preferably, also comprise a switching device, from the carbonated drink side, medium can be introduced into the prime economizer, then enters the rear class economizer; Also can be introduced into the rear class economizer, then enter the prime economizer.Preferably, described switching device comprises: four valves all around; When forward and backward valve is opened, when the left and right valve cuts out, from the carbonated drink side, the series connection of front and back level economizer, level economizer before and after medium successively enters; When left and right, valve is opened, when the front and back valve cuts out, and from the carbonated drink side, the series connection of front and back level economizer, medium is introduced into the rear class economizer, then enters the prime economizer.
Preferably, comprise a switching device, from the carbonated drink side, medium can be introduced into the prime economizer, then enters the rear class economizer; Level economizer before and after also can simultaneously entering, and make rear class economizer counter-flow arrangement.Preferably, described switching device comprises: five valves all around;
Preferably, when forward and backward valve is opened, when in left and right, three valves cut out, from the carbonated drink side, the series connection of front and back level economizer, level economizer before and after medium successively enters; When left valve with after valve close, when front valve, right valve and middle valve are opened, from the carbonated drink side, front and back level economizer is connected in parallel, rear class economizer counter-flow arrangement.
Preferably, one of described valve has the control valve function.
Preferably, described SCR equipment entrance place arranges a flue gas temperature measurement device; Between switching device and cigarette temperature device, the automatic feedback device is set, when SCR equipment entrance temperature, during lower than certain temperature, the instruction switching device is switched.
Preferably, described SCR equipment entrance place arranges a flue gas temperature measurement device; Between control valve or adjusting device and cigarette temperature device, the automatic feedback device is set, described automatic feedback device is associated with the aperture of flue gas temperature measurement device and control valve.
The present invention is by the optimization to system, the system of boiler is improved, guarantee to enter the reaction temperature that the flue-gas temperature of SCR equipment all requires higher than its catalyst under all loads, guarantee that the flue-gas temperature that enters air preheater, at its zone of reasonableness, does not increase the difficulty of air preheater design and the flue gas loss of boiler yet simultaneously.
Boiler afterbody heating surface is economizer, the present invention is by afterbody heating surface hierarchical arrangement (serial or parallel connection), by a switching device, make rear class economizer exit flue-gas temperature improve, guarantee the temperature range of in boiler full load SCR reaction, guarantee that the design of air preheater and exhaust gas temperature are in rational level simultaneously.
The accompanying drawing explanation
Fig. 1 is the conventional layout of boiler of the π with SCR equipment diagram;
Fig. 2 arranges diagram for the conventional tower boiler with SCR equipment;
Fig. 3 is front and back level economizer co-current flow and counter-current flow switching device shifter schematic diagrames;
Fig. 4 is front and back level economizer time and tide and series and parallel switching device shifter schematic diagram;
In figure: prime economizer 1, SCR equipment 2, air preheater 3, body and SCR equipment be connected flue 4, air preheater gas approach 5, rear class economizer 6, front valve 7, rear valve 8, left valve 9, right valve 10, middle valve 20.
The specific embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation, but the present invention is not limited to following embodiment.
Fig. 1 is the conventional layout of boiler of the π with SCR equipment diagram.Economizer is arranged in boiler back end ductwork, as the afterbody heating surface of boiler body; Before SCR equipment 2 is arranged in air preheater 3, boiler body is connected by flue 4 with SCR equipment, and SCR equipment 2 is connected by flue with air preheater 3.Flue gas after boiler combustion, after other heating surfaces through boiler body, first passes through economizer, then by the flue 4 be connected with SCR equipment, enters SCR equipment 2, and then flue gas enters air preheater 3 through air preheater gas approach 5.
Fig. 2 arranges diagram for the conventional tower boiler with SCR equipment.Economizer is arranged in the upper boiler flue, as the last main heating surface of boiler body.
Fig. 3, front and back level economizer series and parallel switching device shifter schematic diagram.Before the import of prime economizer, one valve is set, is called front valve 7, a valve is set after the rear class economizer exit, be called rear valve 8.Two bypass ducts are set between the import of prime economizer and rear class economizer exit, after front valve 7 and between after rear valve, the first bypass are set; Before front valve 7 and between before rear valve 8, the second bypass is set in addition.One valve respectively is set in two bypasses, left valve 9 is set in the first bypass, right valve 10 is set in the second bypass.When left and right, valve cuts out, and when the front and back valve is opened, from the carbonated drink side, front and back level economizer is being connected in series to rear class by prime.When front and back, valve cuts out, and when the left and right valve is opened, from the carbonated drink side, front and back level economizer is being connected in series to prime by rear class.Therefore by the switching of these four valves, make carbonated drink side medium can be introduced into prime economizer 1, also can be introduced into rear class economizer 6, coordinate with the flue gas of economizer outside, realize the switching of following current and adverse current.Co-current flow and counter-current flow refers to the relative flow direction between working medium (steam, feedwater and air etc.) and flue gas.When the flow direction of flue gas and working medium is identical, claim following current; When the flow direction of flue gas and working medium is contrary, claim adverse current.Suppose that flue gas flows to rear class economizer 6 from prime economizer 1, when left and right, valve cuts out, and when the front and back valve is opened, front and back level economizer following current is arranged; When the front and back valve is opened, the left and right valve cuts out, front and back level economizer counter-flow arrangement.When the carbonated drink medium total amount that enters economizer is constant, can, by the switching of co-current flow and counter-current flow, change the temperature of prime economizer exit flue gas and rear class economizer exit flue gas.During the whole adverse current of front and back level economizer, the heat transfer temperature and pressure are high, and caloric receptivity is large, and the flue-gas temperature of rear class economizer exit is low; During the whole following current of front and back level economizer, the heat transfer temperature and pressure are low, recept the caloric little, and the flue-gas temperature of rear class economizer exit is high.When boiler load reduces, in order to improve, enter SCR equipment flue-gas temperature, economizer should be arranged in following current.If four valves have control valve function or itself for shut-off valve but front and back arrange control valve, also can regulate the rate-of flow that enters economizer all around.For example when the front and back valve, open, when one of left and right valve has certain aperture, the rate-of flow that enters economizer reduces to some extent, and the temperature of outlet flue gas rises.
Fig. 4 is front and back level economizer time and tide and connection in series-parallel switching device shifter schematic diagram, on the basis of Fig. 3, at left valve 9, afterwards and between the prime economizer exit the 3rd bypass duct is set, and at the 3rd bypass duct, middle valve 20 is set.When central valve 20 cuts out, its situation is identical with Fig. 3, no longer sets forth.When left valve 9 with after valve 8 close, when front valve 7, right valve 10 and middle valve 20 are opened, from the carbonated drink side, front and back level economizer is connected in parallel; Suppose that flue gas flows to rear class economizer 6 from prime economizer 1, now, the following current of prime economizer is arranged, rear class economizer counter-flow arrangement.If all around five valves have the control valve function or or itself be shut-off valve but front and back arrange control valve, also can regulate level economizer before and after entering between the rate-of flow ratio, for example prime accounts for 40%, rear class accounts for 60%.
In Fig. 4, when front and back, valve cuts out, and when the left, center, right valve is opened, the carbonated drink medium is introduced into the rear class economizer, and after going out the rear class economizer, carbonated drink is divided two-way, and a road is valve 20 processes therefrom; One road is from prime economizer process, then passes through left valve; Last two-way is merging.Now, the effect that middle valve 20 is the equal of a bypass valve.By the aperture of valve in regulating, regulate the Steam-water Flow that enters the prime economizer, thereby regulate the temperature of prime economizer exit flue gas.
Claims (8)
1. an applicable denitration device is born the boiler that omnidistance load puts into operation, and described boiler is furnished with economizer, SCR equipment (2), air preheater (3) in flue; Described economizer, from fume side, is divided into prime economizer (1) and rear class economizer (6); It is characterized in that:
Flue gas after boiler combustion is after other heating surfaces through boiler body, first pass through forward and backward level economizer, then by the flue (4) be connected with SCR equipment, enter SCR equipment (2), finally by air preheater gas approach (5), enter air preheater (3).
2. the boiler that the negative omnidistance load of applicable denitration device according to claim 1 puts into operation is characterized in that:
Also comprise a switching device, from the carbonated drink side, medium can be introduced into prime economizer (1), then enters rear class economizer (6); Also can be introduced into rear class economizer (6), then enter prime economizer (1).
3. the boiler that the negative omnidistance load of applicable denitration device according to claim 2 puts into operation is characterized in that:
Described switching device comprises: front valve (7), rear valve (8), left valve (9), right valve (10) four valves;
When forward and backward valve is opened, when left and right valve cuts out, from the carbonated drink side, the series connection of front and back level economizer, level economizer before and after medium successively enters;
When left and right valve is opened, when forward and backward valve cuts out, from the carbonated drink side, the series connection of front and back level economizer, medium is introduced into the rear class economizer, then enters the prime economizer.
4. the boiler that the negative omnidistance load of applicable denitration device according to claim 1 and 2 puts into operation is characterized in that:
Comprise a switching device, from the carbonated drink side, medium can be introduced into prime economizer (1), then enters rear class economizer (6); Level economizer before and after also can simultaneously entering, and make rear class economizer counter-flow arrangement.
5. the boiler that the negative omnidistance load of applicable denitration device according to claim 4 puts into operation is characterized in that:
Described switching device comprises: front valve (7), rear valve (8), left valve (9), right valve (10), middle valve (20) five valves;
When forward and backward valve is opened, when in left and right, three valves cut out, from the carbonated drink side, the series connection of front and back level economizer, level economizer before and after medium successively enters;
When left valve (9) with after valve (8) close, front valve (7), right valve (10) and middle valve (20) are while opening, from the carbonated drink side, front and back level economizer is connected in parallel, rear class economizer counter-flow arrangement.
6. the boiler put into operation according to the negative omnidistance load of the described applicable denitration device of claim 3 or 5 is characterized in that:
One of described valve has the control valve function.
7. the boiler put into operation according to the negative omnidistance load of the described applicable denitration device of one of claim 2-5 is characterized in that:
Described SCR equipment (2) porch arranges a flue gas temperature measurement device; Between switching device and cigarette temperature device, the automatic feedback device is set, when SCR equipment (2) inlet temperature, during lower than certain temperature, the instruction switching device is switched.
8. the boiler that the negative omnidistance load of applicable denitration device according to claim 6 puts into operation is characterized in that:
Described SCR equipment (2) porch arranges a flue gas temperature measurement device; Between control valve or adjusting device and cigarette temperature device, the automatic feedback device is set, described automatic feedback device is associated with the aperture of flue gas temperature measurement device and control valve.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210473354.9A CN102937296B (en) | 2012-11-20 | 2012-11-20 | Boiler suitable for denitration device negative whole process load operation |
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| CN201210473354.9A CN102937296B (en) | 2012-11-20 | 2012-11-20 | Boiler suitable for denitration device negative whole process load operation |
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| CN102937296A true CN102937296A (en) | 2013-02-20 |
| CN102937296B CN102937296B (en) | 2015-04-08 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102937297A (en) * | 2012-11-20 | 2013-02-20 | 上海锅炉厂有限公司 | Arrangement mode of boiler economizer suitable for denitration device whole course load commissioning |
| CN103846007A (en) * | 2014-03-17 | 2014-06-11 | 山西新唐工程设计有限公司 | Denitration control method of flue-gas selective catalytic reduction device |
| CN104879743A (en) * | 2015-05-22 | 2015-09-02 | 中国神华能源股份有限公司 | Boiler thermodynamic system and boiler |
| CN103836607B (en) * | 2014-03-05 | 2015-12-09 | 华电电力科学研究院 | Thermal power plant's SCR denitration reactor working temperature controller and control method thereof |
| CN108590817A (en) * | 2018-03-21 | 2018-09-28 | 天津大学 | Switchable type SCR denitration system behind the preceding whirlpool in whirlpool |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102937297A (en) * | 2012-11-20 | 2013-02-20 | 上海锅炉厂有限公司 | Arrangement mode of boiler economizer suitable for denitration device whole course load commissioning |
| CN102937297B (en) * | 2012-11-20 | 2015-04-08 | 上海锅炉厂有限公司 | Boiler economizer suitable for denitration device whole course load commissioning |
| CN103836607B (en) * | 2014-03-05 | 2015-12-09 | 华电电力科学研究院 | Thermal power plant's SCR denitration reactor working temperature controller and control method thereof |
| CN103846007A (en) * | 2014-03-17 | 2014-06-11 | 山西新唐工程设计有限公司 | Denitration control method of flue-gas selective catalytic reduction device |
| CN104879743A (en) * | 2015-05-22 | 2015-09-02 | 中国神华能源股份有限公司 | Boiler thermodynamic system and boiler |
| CN108590817A (en) * | 2018-03-21 | 2018-09-28 | 天津大学 | Switchable type SCR denitration system behind the preceding whirlpool in whirlpool |
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| CN102937296B (en) | 2015-04-08 |
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