CN102937297B - Boiler economizer suitable for denitration device whole course load commissioning - Google Patents
Boiler economizer suitable for denitration device whole course load commissioning Download PDFInfo
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- CN102937297B CN102937297B CN201210473384.XA CN201210473384A CN102937297B CN 102937297 B CN102937297 B CN 102937297B CN 201210473384 A CN201210473384 A CN 201210473384A CN 102937297 B CN102937297 B CN 102937297B
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Abstract
The invention discloses a boiler economizer suitable for denitration device whole load commissioning boiler economizer. A boiler comprises an economizer, a selective catalytic reduction (SCR) device and an air pre-heater, and the economizer is divided into a former stage economizer and a later stage economizer. After passing through other heated faces of a boiler body, flue gas combusted by the boiler firstly passes through the former state economizer, then enters into the SCR device through a flue connected with the SCR device, then passes through the later stage economizer, and finally enters to the air pre-heater through an inlet flue of the air pre-heater. The front stage economizer is arranged in the flue before the SCR device, and the later stage economizer is arranged in a flue after the SCR device. The arrangement mode ensures that temperature of flue gas entering into the SCR device is higher than reaction temperatures required by other catalysts under all loads.
Description
Technical field
The present invention relates to boiler plant field, especially a kind of boiler economizer being applicable to put into operation under all loads of denitration device.
Background technology
Along with country is to the pay attention to day by day of environmental protection, in order to ensure the discharge index of final NOx, while employing low NOx combustion equipment, denitration device has become one of standard configuration of boiler from now on.In the boiler design of routine, if adopt SCR (SCR) denitration mode, denitrification apparatus is usually placed in the outlet of boiler heating surface, the entrance of air preheater.But in order to guarantee the efficiency that boiler can reach higher simultaneously, time usually at full capacity, the flue-gas temperature of air preheater is at about 350 ~ 400 DEG C, and this flue-gas temperature can meet the requirement that puts into operation of SCR equipment under high loads.But along with the reduction of load, the flue-gas temperature through SCR equipment also decreases, if lower than a certain temperature (as 315 DEG C, SCR equipment is seen in specific requirement), the catalyst in SCR equipment just cannot work, and therefore cannot 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 entering SCR equipment time then at full capacity will far above conventional value, equally because flue gas does not produce significantly temperature drop substantially through SCR equipment, so high flue-gas temperature enters the material that air preheater cannot use original air preheater first, second cannot meet the requirement of conventional exhaust gas temperature by means of only air preheater, cause the increase that boiler exhaust gas loses.
Summary of the invention
The object of this invention is to provide a kind of boiler economizer being applicable to put into operation under all loads of denitration device, make SCR equipment under whole course load state can both denitration.Technical scheme is as follows:
Be applicable to the boiler economizer put into operation under all loads of denitration device, 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 is after other heating surfaces of boiler body, first through prime economizer, flue then by being connected with SCR equipment enters SCR equipment, then through rear class economizer, enters air preheater finally by air preheater gas approach.
Preferably, comprise a switching device, from carbonated drink side, medium can be introduced into prime economizer, then enters rear class economizer; Also can be introduced into rear class economizer, then enter prime economizer.Preferably, described switching device comprises: four valves all around; When forward and backward valve is opened, when left and right valve cuts out, from carbonated drink side, front stage economizer is connected, and medium successively enters front stage economizer; When left and right, valve is opened, and when front and back valve cuts out, from carbonated drink side, front stage economizer is connected, and medium is introduced into rear class economizer, then enters prime economizer.
Preferably, comprise a switching device, from carbonated drink side, medium can be introduced into prime economizer, then enters rear class economizer; Also can enter front stage economizer simultaneously, and make rear class economizer counter-flow arrangement.Preferably, described switching device comprises: five valves all around; When forward and backward valve is opened, when in left and right, three valves cut out, from carbonated drink side, front stage economizer is connected, and medium successively enters front stage economizer; When left valve with after valve close, when front valve, right valve and middle valve are opened, from carbonated drink side, front stage economizer is connected in parallel, rear class economizer counter-flow arrangement.
Preferably, one of described valve has control valve function.
Preferably, described SCR equipment entrance place arranges a flue gas temperature measurement device; Between switching device and cigarette temperature device, arrange automatic feedback device, when SCR equipment entrance temperature is lower than certain temperature, instruction switching device switches.
Preferably, described SCR equipment entrance place arranges a flue gas temperature measurement device; Arrange automatic feedback device at control valve or between adjusting device and cigarette temperature device, described automatic feedback device associates with the aperture of control valve with flue gas temperature measurement device.
The present invention is by the optimization to system, the system of boiler is improved, guarantee the reaction temperature of flue-gas temperature all higher than its catalyst requirement under all loads entering SCR equipment, guarantee that the flue-gas temperature entering air preheater is also at its zone of reasonableness, does not increase the difficulty of air preheater design and the flue gas loss of boiler simultaneously.
Boiler afterbody heating surface is economizer, the present invention is by afterbody heating surface hierarchical arrangement (serial or parallel connection), before wherein one-level is arranged in SCR equipment, after another level is arranged in SCR equipment, air preheater entrance, realize the Interest frequency of flue gas, 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 present invention guarantees the reaction temperature of flue-gas temperature all higher than its catalyst requirement under all loads entering SCR equipment.
Accompanying drawing explanation
Fig. 1 is the π layout of boiler diagram of conventional band SCR equipment;
Fig. 2 is the tower boiler layout diagram of conventional band SCR equipment;
Fig. 3 is the π type layout of boiler diagram of the band SCR equipment optimized;
Fig. 4 is that diagram arranged by the tower boiler of the band SCR equipment optimized;
Fig. 5 is front stage economizer co-current flow and counter-current flow switching device shifter schematic diagram;
Fig. 6 is front stage economizer time and tide and series and parallel switching device shifter schematic diagram;
In figure: prime economizer 1, SCR equipment 2, air preheater 3, the connection flue 4 of body and SCR equipment, air preheater gas approach 5, rear class economizer 6, front valve 7, rear valve 8, left valve 9, right valve 10, middle valve 20.
Detailed description of the invention
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 π layout of boiler diagram of conventional band SCR equipment.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 is after other heating surfaces of boiler body, and first through economizer, the flue 4 then by being connected with SCR equipment enters SCR equipment 2, and then flue gas enters air preheater 3 through air preheater gas approach 5.
Fig. 2 is the tower boiler layout diagram of conventional band SCR equipment.Economizer is arranged in upper boiler flue, as the last main heating surface of boiler body.
The present invention improves the π boiler of the band SCR equipment of routine and tower boiler, and the form of improvement is shown in Fig. 3, Fig. 4.
Fig. 3 is the π type layout of boiler figure of the band SCR equipment optimized, and as shown in the figure, economizer is classified as prime economizer 1 and rear class economizer 6.Prime economizer 1 can for being arranged in the economizer in single flue, and the economizer also can separated in flue for being arranged in front and back combines, and its combination form can be in parallel or series connection; It can be in parallel between prime economizer 1 and rear class economizer 6 or series connection; Carbonated drink side medium can be introduced into prime economizer 1, also can be introduced into rear class economizer 6, or enters front and back stages economizer simultaneously.In the present embodiment, prime economizer 1 is arranged in boiler back end ductwork, after rear class economizer 6 is arranged in SCR equipment 2; SCR equipment 2 is arranged between front and back stages economizer, and boiler body is connected by flue 4 with SCR equipment, and rear class economizer 6 is connected by flue with air preheater 3.Flue gas after boiler combustion is after other heating surfaces of boiler body, first through prime economizer 1, flue 4 then by being connected with SCR equipment enters SCR equipment 2, flue gas is by entering rear class economizer 6 after SCR equipment 2, and then flue gas enters air preheater 3 through air preheater gas approach 5.
Fig. 4 is the tower boiler layout drawing of the band SCR equipment optimized, and in the present embodiment, economizer is arranged in upper boiler flue, as the last main heating surface of boiler body; Before SCR equipment 2 is arranged in air preheater 3, boiler body is connected by flue with SCR equipment, and SCR equipment is connected by flue with air preheater.Flue gas after boiler combustion is after other heating surfaces of boiler body, first through prime economizer 1, flue 4 then by being connected with SCR equipment enters SCR equipment 2, flue gas is by entering rear class economizer 6 after SCR equipment 2, and then flue gas enters air preheater 3 through air preheater gas approach 5.
Fig. 5, front stage economizer series and parallel switching device shifter schematic diagram.One valve is set before the import of prime economizer, is called front valve 7, a valve is set after 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, between namely after front valve 7 and after rear valve, the first bypass is set; Between in addition before front valve 7 and before rear valve 8, the second bypass is set.Two bypasses respectively arrange a valve, namely left valve 9 is set in the first bypass, the second bypass arranges right valve 10.When left and right valve cuts out, when front and back valve is opened, from carbonated drink side, front stage economizer is by prime being connected in series to rear class.When front and back valve cuts out, when left and right valve is opened, from carbonated drink side, front stage economizer is by rear class being connected in series to prime.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 outside economizer, 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, to water and air etc.) and flue gas.When flue gas is identical with the flow direction of working medium, 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, when front and back valve is opened, front stage economizer down current arrangement; When front and back valve is opened, left and right valve cuts out, front stage economizer counter-flow arrangement.When the carbonated drink medium total amount entering economizer is constant, by the switching of co-current flow and counter-current flow, the temperature of prime economizer exit flue gas and rear class economizer exit flue gas can be changed.During front stage economizer entirety adverse current, 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 following current of front stage economizer entirety, heat transfer temperature and pressure are low, and recept the caloric little, the flue-gas temperature of rear class economizer exit is high.Namely, when boiler load reduces, enter SCR equipment flue-gas temperature to improve, economizer should down current arrangement.If four valves have control valve function or itself is shut-off valve but front and back arrange control valve, the rate-of flow entering economizer also can be regulated all around.Such as when front and back valve is opened, when one of left and right valve has certain aperture, the rate-of flow entering economizer reduces to some extent, and the temperature of exiting flue gas rises.
Fig. 6 is front stage economizer time and tide and connection in series-parallel switching device shifter schematic diagram, on the basis of Fig. 5, after the left valve 9 and between prime economizer exit, arranges the 3rd bypass duct, and in the 3rd bypass duct is arranged valve 20.When central valve 20 cuts out, its situation is identical with Fig. 5, 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 carbonated drink side, front stage economizer is connected in parallel; Suppose that flue gas flows to rear class economizer 6 from prime economizer 1, now, prime economizer down current arrangement, rear class economizer counter-flow arrangement.If five valves have control valve function or itself is shut-off valve but front and back arrange control valve all around, also can regulate to enter rate-of flow ratio between front stage economizer, such as prime accounts for 40%, and rear class accounts for 60%.
In figure 6, when front and back valve cuts out, when left, center, right valve is opened, carbonated drink medium is introduced into rear class economizer, and after going out rear class economizer, carbonated drink divides two-way, and a road therefrom valve 20 is passed through; One road from prime economizer process, then through left valve; Last two-way is in merging.Now, middle valve 20 is the equal of the effect of a bypass valve.By the aperture of valve in adjustment, regulate the Steam-water Flow entering prime economizer, thus regulate the temperature of prime economizer exit flue gas.
Claims (7)
1. be applicable to the boiler economizer put into operation under all loads of denitration device, 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 of boiler body, first through prime economizer (1), flue (4) then by being connected with SCR equipment enters SCR equipment (2), again through rear class economizer (6), enter air preheater (3) finally by air preheater gas approach (5);
Comprise a switching device, from carbonated drink side, medium is introduced into prime economizer (1), then enters rear class economizer (6); After switching device switches, medium is introduced into rear class economizer (6), then enters prime economizer (1).
2. the boiler economizer being applicable to put into operation under all loads of denitration device according to claim 1, is characterized in that:
Described switching device comprises: four valves (7,8,9,10) all around;
Current valve (7), rear valve (8) are opened, and when left valve (9), right valve (10) are closed, from carbonated drink side, front stage economizer is connected, and medium successively enters front stage economizer;
When left valve (9), right valve (10) are opened, when front valve (7), rear valve (8) are closed, from carbonated drink side, front stage economizer is connected, and medium is introduced into rear class economizer, then enters prime economizer.
3. be applicable to the boiler economizer put into operation under all loads of denitration device, described boiler be furnished with in flue economizer,
SCR equipment (2), air preheater (3); Described economizer, from fume side, is divided into prime economizer (1)
With rear class economizer (6); It is characterized in that:
Flue gas after boiler combustion is after other heating surfaces of boiler body, first through prime economizer (1), flue (4) then by being connected with SCR equipment enters SCR equipment (2), again through rear class economizer (6), enter air preheater (3) finally by air preheater gas approach (5);
Comprise a switching device, from carbonated drink side, medium is introduced into prime economizer (1), then enters rear class economizer (6);
After switching device switches, from carbonated drink side, medium enters front stage economizer simultaneously, and makes rear class economizer counter-flow arrangement.
4. the boiler economizer being applicable to put into operation under all loads of denitration device according to claim 3, is characterized in that:
Described switching device comprises: five valves (7,8,9,10,20) all around;
Current valve (7), rear valve (8) are opened, when left valve (9), right valve (10), middle valve (20) three valve are closed, from carbonated drink side, front stage economizer is connected, and medium successively enters front stage economizer;
When left valve (9) with after valve (8) close, when front valve (7), right valve (10) and middle valve (20) are opened, from carbonated drink side, front stage economizer is connected in parallel, rear class economizer counter-flow arrangement.
5. the boiler economizer being applicable to put into operation under all loads of denitration device according to claim 2 or 4, is characterized in that:
One of described valve has control valve function.
6., according to the boiler economizer being applicable to put into operation under all loads of denitration device one of claim 1-4 Suo Shu, it is special
Levy and be:
Described SCR equipment (2) porch arranges a flue gas temperature measurement device; Between switching device and flue gas temperature measurement device, arrange automatic feedback device, when SCR equipment (2) inlet temperature is lower than certain temperature, instruction switching device switches.
7. the boiler economizer being applicable to put into operation under all loads of denitration device according to claim 5, is characterized in that:
Described SCR equipment (2) porch arranges a flue gas temperature measurement device; Between control valve and flue gas temperature measurement device, arrange automatic feedback device, described automatic feedback device associates with the aperture of control valve with flue gas temperature measurement device.
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| JP5624646B1 (en) * | 2013-05-23 | 2014-11-12 | 電源開発株式会社 | Thermal power plant and operation method of thermal power plant. |
| CN114307574A (en) * | 2021-12-17 | 2022-04-12 | 武汉旭清工程技术有限公司 | Flue gas purification system applied to biomass power plant |
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| CN102937296A (en) * | 2012-11-20 | 2013-02-20 | 上海锅炉厂有限公司 | Boiler suitable for denitration device negative whole process load operation |
| CN102937295A (en) * | 2012-11-20 | 2013-02-20 | 上海锅炉厂有限公司 | Boiler economizer arrangement form suitable for denitration device negative whole process load operation |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US20040191709A1 (en) * | 2003-03-26 | 2004-09-30 | Miller Eric S. | Economizer bypass with ammonia injection |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN201237334Y (en) * | 2007-11-28 | 2009-05-13 | 四川东方锅炉工业锅炉集团有限公司 | Non-low temperature corrosion boiler of air preheater |
| CN102512953A (en) * | 2011-12-23 | 2012-06-27 | 东方电气集团东方锅炉股份有限公司 | CFB boiler SCR denitration technology and denitration device |
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| CN102937296A (en) * | 2012-11-20 | 2013-02-20 | 上海锅炉厂有限公司 | Boiler suitable for denitration device negative whole process load operation |
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