CN102937296B - 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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- CN102937296B CN102937296B CN201210473354.9A CN201210473354A CN102937296B CN 102937296 B CN102937296 B CN 102937296B CN 201210473354 A CN201210473354 A CN 201210473354A CN 102937296 B CN102937296 B CN 102937296B
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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 boiler plant field, especially a kind of denitration device that is suitable for bears the boiler that whole course load puts into operation.
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 denitration device that is suitable for and bear the boiler that whole course load puts into operation, make SCR equipment under whole course load state can both denitration.Technical scheme is as follows:
Be suitable for denitration device and bear the boiler that whole course load 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 is after other heating surfaces of boiler body, and first through forward and backward level economizer, the flue then by being connected with SCR equipment enters SCR equipment, enters air preheater finally by air preheater gas approach.
Preferably, also 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;
Preferably, 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), by a switching device, rear class economizer exit flue-gas temperature is improved, 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.
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 front stage economizer co-current flow and counter-current flow switching device shifter schematic diagram;
Fig. 4 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.
Fig. 3, 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. 4 is front stage economizer time and tide and connection in series-parallel switching device shifter schematic diagram, on the basis of Fig. 3, 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. 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 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 all around five valves have control valve function or or itself be shut-off valve but front and back arrange control valve, 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 the diagram, 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 suitable for denitration device and bear the boiler that whole course load puts into operation, 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 forward and backward level economizer, flue (4) then by being connected with SCR equipment enters SCR equipment (2), enters air preheater (3) finally by air preheater gas approach (5);
Also comprise a switching device, by this switching device, from carbonated drink side, make medium can be introduced into prime economizer (1), then enter rear class economizer (6); Also can be introduced into rear class economizer (6), then enter prime economizer (1).
2. the denitration device that is suitable for according to claim 1 bears the boiler that whole course load puts into operation, and it is characterized in that:
Described switching device comprises: front valve (7), rear valve (8), left valve (9), right valve (10) four valve;
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, when forward and backward valve cuts out, from carbonated drink side, front stage economizer is connected, and medium is introduced into rear class economizer, then enters prime economizer.
3. the denitration device that is suitable for according to claim 1 bears the boiler that whole course load puts into operation, and it is characterized in that:
A described switching device, by this switching device, from carbonated drink side, makes medium can be introduced into prime economizer (1), then enters rear class economizer (6); Also can enter front stage economizer simultaneously, and make rear class economizer counter-flow arrangement.
4. the denitration device that is suitable for according to claim 3 bears the boiler that whole course load puts into operation, and it is characterized in that:
Described switching device comprises: front valve (7), rear valve (8), left valve (9), right valve (10), middle valve (20) five valve;
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 (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 denitration device that is suitable for according to claim 2 or 4 bears the boiler that whole course load puts into operation, and it is characterized in that:
One of described valve has control valve function.
6. bear according to the denitration device that is suitable for one of claim 1-4 Suo Shu the boiler that whole course load puts into operation, it is characterized in that:
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 denitration device that is suitable for according to claim 5 bears the boiler that whole course load puts into operation, and it 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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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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| US4353206A (en) * | 1980-08-20 | 1982-10-12 | Westinghouse Electric Corp. | Apparatus for removing NOx and for providing better plant efficiency in combined cycle plants |
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Patent Citations (8)
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| US4353206A (en) * | 1980-08-20 | 1982-10-12 | Westinghouse Electric Corp. | Apparatus for removing NOx and for providing better plant efficiency in combined cycle plants |
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