CN202844881U - Intelligent low-temperature denitration system - Google Patents
Intelligent low-temperature denitration system Download PDFInfo
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- CN202844881U CN202844881U CN 201220488345 CN201220488345U CN202844881U CN 202844881 U CN202844881 U CN 202844881U CN 201220488345 CN201220488345 CN 201220488345 CN 201220488345 U CN201220488345 U CN 201220488345U CN 202844881 U CN202844881 U CN 202844881U
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Abstract
The utility model discloses an intelligent low-temperature denitration system. The intelligent low-temperature denitration system comprises a boiler, an economizer, an air pre-heater, a dust remover and a chimney which are sequentially connected, wherein an energy-saving device is connected between the air pre-heater and the dust remover, a low-temperature denitration unit is arranged between the dust remover and the chimney, and the low-temperature denitration unit and the energy-saving device are both communicated with a water supply system of the boiler. An absorption tower in the intelligent low-temperature denitration system disclosed by the utility model is arranged in a tail flue of the boiler, and the absorption tower is small in volume and does not need not take up lots of space, so that the low-temperature denitration is implemented without carrying out modification on a boiler body, and a reconstruction process is implemented just through stopping the boiler within about 7 days. In the intelligent low-temperature denitration system, an intelligent full-automatic energy-saving device is arranged in back of the air pre-heater and in front of the dust remover, so that in the process of denitration completion, the flue gas loss of the boiler is reduced and concurrently the energy-saving requirements are taken into consideration.
Description
Technical field
The utility model relates to a kind of denitrating system, and particularly a kind of intelligent low-temperature denitrating system is used for industrial boiler system.
Background technology
Flue denitration (SCR) technology that adopts at present, the reaction bed of its catalyst are arranged in behind the economizer before the air preheater mostly, and reaction temperature is between 350 ℃-400 ℃, and its absorption tower is arranged between economizer and the air preheater.As shown in Figure 1, successively by an economizer 2, a denitrification apparatus 3, an air preheater 4, a deduster 5 and a desulfurizer 6, the flue gas after processing is at last discharged by a chimney 7 by boiler 1 flue gas out.According to traditional flue denitrating technique, it requires economizer 2 that 6 meters space will be arranged between air preheater 4 at least, and the flue between most of boiler economizer and the air preheater is all compact.Therefore, usually need rearrange by-pass flue.
The huge need of absorption tower volume of tradition flue denitration take very large space, and for the body that cooperates traditional flue denitration boiler must be made larger change, whole engineering needs blowing out 2-3 month.The blowing out loss is huge, for example the 300MW unit surpasses hundred million yuans because idle cost is transformed in the denitration under the traditional handicraft, in addition, because its absorption tower is arranged between economizer and the air preheater in traditional denitrating technique, such as the serious stifled ash that extremely easily causes air preheater bigger than normal of amount of ammonia slip in the technique.
To this, introduced the technology of low-temperature denitration, its reaction temperature is between 160 ℃-240 ℃, and reaction bed is arranged in after the deduster, and floor space is little, and furnace outage time was at 7-10 days.But the catalyst of low-temperature denitration has strict requirement to the dust-laden in the flue gas and sulfur content, so after mostly can only being arranged in desulfurization.Yet the flue-gas temperature after the desulfurization only has 50 ℃-70 ℃, needs extraneous thermal source with flue gas to 160 ℃, brings difficulty in the concrete technology flow process.
The utility model content
The technical problems to be solved in the utility model is large in order to overcome traditional flue denitrating system occupation of land volume, and the blowing out improvement cost is high and be unfavorable for energy-conservation defective, and a kind of intelligent low-temperature denitrating system is provided, and is applicable in the industrial boiler system.
The utility model is to solve above-mentioned technical problem by following technical proposals: a kind of intelligent low-temperature denitrating system, comprise the boiler, an economizer, an air preheater, a deduster and the chimney that connect successively, its characteristics are, be connected with an energy saver between described air preheater and the described deduster, be provided with a low-temperature denitration unit between described deduster and described chimney, described low-temperature denitration unit and described energy saver all are communicated with the water supply system of described boiler.
Preferably, described low-temperature denitration unit comprises a desulfurizer, a First Heat Exchanger, a low-temperature denitration device and one second heat exchanger that connects successively, described First Heat Exchanger is communicated with the boiler circuit of described boiler, and described the second heat exchanger is communicated with the water supply system of described boiler.
Preferably, described energy saver and described the second heat exchanger are equipped with a circulating pump and several thermal detectors to the pipeline of the water supply system of described boiler.
Preferably, described First Heat Exchanger is provided with a steam control valve to the pipeline of the boiler circuit of described boiler.
Preferably, be equipped with a thermo detector on the front side pipeline of described First Heat Exchanger, described the second heat exchanger and described energy saver and/or the rear side pipeline.
Positive progressive effect of the present utility model is: the catalyst reaction temperatures of the utility model intelligent low-temperature denitrating system is at 160 ℃-200 ℃, its absorption tower is arranged in the back-end ductwork of boiler, and the volume on absorption tower is little to need not to take large quantity space, low-temperature denitration does not need boiler body is changed, and transformation process only needs blowing out about 7 days.Described low-temperature denitrifying system has adopted the energy saver of Intelligent automatic before the deduster behind air preheater, reduced simultaneously the flue gas loss of boiler in finishing the process of denitration, has taken into account energy-conservation requirement.
Description of drawings
Fig. 1 is the schematic diagram of traditional flue denitrating system.
Fig. 2 is the schematic diagram of the utility model intelligent low-temperature denitrating system.
The specific embodiment
Mode below by embodiment further specifies the utility model, but therefore the utility model is not limited among the described scope of embodiments.
As shown in Figure 2, the utility model intelligent low-temperature denitrating system comprises a boiler 1, an economizer 2, an air preheater 4, a deduster 5 and a chimney 7 that connects successively, between air preheater 4 and deduster 5, be connected with an energy saver 9, between deduster 5 and chimney 7, be provided with a low-temperature denitration unit.Described low-temperature denitration unit and energy saver 9 all are communicated with the water supply system of described boiler.Wherein, described low-temperature denitration unit comprises a desulfurizer 6, a First Heat Exchanger 10, a low-temperature denitration device 8 and one second heat exchanger 11 that connects successively, First Heat Exchanger 10 is communicated with (not shown) with the boiler circuit of described boiler, and the second heat exchanger 11 is communicated with the water supply system of described boiler.
Like this, energy saver 9 and the second heat exchanger 11 can carry out effectively exchange heat by the water supply system of described boiler.Enter approximately 300 ℃-400 ℃ of the flue-gas temperatures of energy saver 9, and still be about about 160 ℃ through the flue-gas temperature that enters the second heat exchanger 11 behind the low-temperature denitration.Energy saver 9 by and the water supply system of described boiler between heat exchange, utilize the flue-gas temperature of original steam generator system to heat boiler feedwater on the one hand, reduced on the other hand by energy saver 9 flue-gas temperature out, pass through successively again deduster 5 and desulfurizer 6, be conducive to prolong the life-span of deduster 5 and desulfurizer 6.In like manner, the second heat exchanger 11 by and the water supply system of described boiler between heat exchange, utilize flue-gas temperature to heat boiler feedwater on the one hand, reduced on the other hand by the second heat exchanger 11 flue-gas temperature out, so that the exhaust gas temperature of finally being discharged by chimney 7 approximately about 85 ℃, meets the requirement of energy-conserving and environment-protective.
In addition, because lower through First Heat Exchanger 10 flue-gas temperature out after the desulfurization, approximately 50 ℃-70 ℃, such temperature can't satisfy low-temperature denitration reaction temperature (approximately 160 ℃-200 ℃ of catalyst reaction temperatures) after this.Therefore, in the utility model low-temperature denitrifying system First Heat Exchanger 10 is connected with the boiler circuit of described boiler, by high-quality the drawing gas in the described boiler steam and water circuit, be that high-temperature steam heats this flue gas, make its temperature be increased to the low-temperature denitration reaction temperature, thereby guarantee the enforcement of low-temperature denitration.
Preferably, energy saver 9 and the second heat exchanger 11 are equipped with a circulating pump 92,112 and several thermal detectors to the pipeline of the water supply system of described boiler.To the pipeline of the boiler circuit of described boiler, be provided with a steam control valve 101 at First Heat Exchanger 10.Circulating pump 92,112 medium circulation that can effectively realize in the heat-exchanging loop, and the flow that steam control valve 101 can control medium, described thermal detector can be monitored the temperature of heat-exchanging loop medium, convenient operation control.In addition, be equipped with a thermo detector 91,111 at front side pipeline and/or the rear side pipeline of First Heat Exchanger 10, the second heat exchanger 11 and energy saver 9, in order to monitor the turnover flue-gas temperature of relevant device.Described thermal detector in the whole low-temperature denitrifying system and described thermo detector be all for the temperature at Real Time Monitoring pipeline each point place, so that whole system operation steady and smooth more.
In addition, preferably, energy saver 9 is an Intelligent full-automatic boiler energy-saving control equipment, and the license notification number that its structure is similar to the applicant is the utility model patent of CN201779641U, repeats no more herein.
Structure according to low-temperature denitrifying system described above, its whole technological process is: install energy saver 9 additional behind boiler 1 afterbody air preheater 4, utilize the heat heating part boiler feedwater of flue gas, monitoring inflow temperature and flue-gas temperature prevent fume side heat exchanger generation cold end corrosion.After desulfurizer 6, by First Heat Exchanger 10, by introducing the high-quality steam that steam turbine is bled in the former boiler steam and water circuit and passing through steam control valve 101 control steam flows, flue-gas temperature is reached more than 160 ℃.At this moment, flue gas enters the out of stock device 8 of low temperature and can effectively realize the low-temperature denitration reaction.
Then, enter the second heat exchanger 11 through the flue gas of denitration, by with the water supply system heat exchange of described boiler after, the flue-gas temperature after the denitration is down to 85 ℃, discharged by chimney at last, thereby finish the whole service flow process.
All above processes, and the action of all parts are carried out automated intelligent control by master controller 12 and computer 13 work stations, to realize whole flow process unmanned.
The utility model intelligent low-temperature denitrating system has satisfied the very strict service condition of low-temperature denitration, has avoided again using outside combustion gas, but has used high-quality drawing gas in the generating set boiler circuit.This flow process has reduced the cigarette temperature before the desulfurization, has reduced the desulfurization cooling water inflow, and has farthest remedied owing to adopting high-quality drawing gas to cause the thermodynamic equilibrium of generating set boiler circuit.In addition, the flue-gas temperature that will enter chimney after the denitration is controlled at about 85 ℃, thereby has promoted the cigarette ability of pulling out of flue gas, has solved chimney and has emitted this insoluble environmental issue of white cigarette.
Although more than described the specific embodiment of the present utility model, it will be understood by those of skill in the art that these only illustrate, protection domain of the present utility model is limited by appended claims.Those skilled in the art can make various changes or modifications to these embodiments under the prerequisite that does not deviate from principle of the present utility model and essence, but these changes and modification all fall into protection domain of the present utility model.
Claims (5)
1. intelligent low-temperature denitrating system, comprise the boiler, an economizer, an air preheater, a deduster and the chimney that connect successively, it is characterized in that, be connected with an energy saver between described air preheater and the described deduster, be provided with a low-temperature denitration unit between described deduster and described chimney, described low-temperature denitration unit and described energy saver all are communicated with the water supply system of described boiler.
2. intelligent low-temperature denitrating system as claimed in claim 1, it is characterized in that, described low-temperature denitration unit comprises a desulfurizer, a First Heat Exchanger, a low-temperature denitration device and one second heat exchanger that connects successively, described First Heat Exchanger is communicated with the boiler circuit of described boiler, and described the second heat exchanger is communicated with the water supply system of described boiler.
3. intelligent low-temperature denitrating system as claimed in claim 2 is characterized in that, described energy saver and described the second heat exchanger are equipped with a circulating pump and several thermal detectors to the pipeline of the water supply system of described boiler.
4. intelligent low-temperature denitrating system as claimed in claim 2 is characterized in that, described First Heat Exchanger is provided with a steam control valve to the pipeline of the boiler circuit of described boiler.
5. such as the described intelligent low-temperature denitrating system of claim 2-4 any one, it is characterized in that, be equipped with a thermo detector on the front side pipeline of described First Heat Exchanger, described the second heat exchanger and described energy saver and/or the rear side pipeline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220488345 CN202844881U (en) | 2012-09-21 | 2012-09-21 | Intelligent low-temperature denitration system |
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| CN 201220488345 CN202844881U (en) | 2012-09-21 | 2012-09-21 | Intelligent low-temperature denitration system |
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| CN202844881U true CN202844881U (en) | 2013-04-03 |
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| CN 201220488345 Expired - Fee Related CN202844881U (en) | 2012-09-21 | 2012-09-21 | Intelligent low-temperature denitration system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103657405A (en) * | 2012-09-21 | 2014-03-26 | 上海阳高新能源科技有限公司 | Intelligent low-temperature denitration system |
| CN103691315A (en) * | 2013-12-25 | 2014-04-02 | 北京建筑材料科学研究总院有限公司 | Heating type cement kiln low-temperature selective catalytic reduction denitration system |
| CN108079777A (en) * | 2017-11-28 | 2018-05-29 | 石河子大学 | A kind of coal-fired plant flue gas low-temperature denitration method and its device |
-
2012
- 2012-09-21 CN CN 201220488345 patent/CN202844881U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103657405A (en) * | 2012-09-21 | 2014-03-26 | 上海阳高新能源科技有限公司 | Intelligent low-temperature denitration system |
| CN103691315A (en) * | 2013-12-25 | 2014-04-02 | 北京建筑材料科学研究总院有限公司 | Heating type cement kiln low-temperature selective catalytic reduction denitration system |
| CN108079777A (en) * | 2017-11-28 | 2018-05-29 | 石河子大学 | A kind of coal-fired plant flue gas low-temperature denitration method and its device |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130403 Termination date: 20160921 |
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| CF01 | Termination of patent right due to non-payment of annual fee |