CN103657405A - Intelligent low-temperature denitration system - Google Patents
Intelligent low-temperature denitration system Download PDFInfo
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- CN103657405A CN103657405A CN201210356933.5A CN201210356933A CN103657405A CN 103657405 A CN103657405 A CN 103657405A CN 201210356933 A CN201210356933 A CN 201210356933A CN 103657405 A CN103657405 A CN 103657405A
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Abstract
The invention discloses an intelligent low-temperature denitration system which comprises a boiler, an economizer, an air preheater, a dust remover and a chimney which are connected with one another in sequence, wherein an energy saving device is connected between the air preheater and the dust remover; a low-temperature denitration unit is arranged between the dust remover and the chimney; both the low-temperature denitration unit and the energy-saving device are communicated with a water feeding system of the boiler. An absorption tower of the intelligent low-temperature denitration system disclosed by the invention is arranged on a tail flue of the boiler, and the size of the absorption tower is small, so that the absorption tower does not need to occupy a large space; a boiler body does not need to be modified due to the low-temperature denitration, and a modification process can be finished only by stopping the boiler for about 7 days. The low-temperature denitration system adopts the intelligent full-automatic energy-saving device which is arranged behind the air preheater and in front of the dust remover; in the process of implementing denitration, the smoke discharging loss of the boiler is reduced, and the requirement on energy saving is met.
Description
Technical field
The present invention relates to a kind of denitrating system, a kind of intelligent low-temperature denitrating system particularly, for industrial boiler system.
Background technology
Flue denitration (SCR) technology adopting at present, the reaction bed of its catalyst is arranged in after economizer before air preheater mostly, and reaction temperature is between 350 ℃-400 ℃, and its absorption tower is arranged between economizer and air preheater.As shown in Figure 1, by boiler 1 flue gas out, successively by an economizer 2, a denitrification apparatus 3, an air preheater 4, a deduster 5 and a desulfurizer 6, the flue gas after finally processing is discharged by a chimney 7.According to traditional flue denitrating technique, it requires economizer 2 at least will have the space of 6 meters between air preheater 4, and flue between most of boiler economizer and air preheater is all compact.Therefore, conventionally need rearrange by-pass flue.
The huge need of absorption tower volume of tradition flue denitration take very large space, and for coordinating the body of traditional flue denitration boiler must make larger change, whole engineering needs blowing out 2-3 month.Blowing out loss is huge, for example 300MW unit is because the denitration transformation idle cost under traditional handicraft surpasses hundred million yuans, in addition, because its absorption tower in traditional denitrating technique is arranged between economizer and air preheater, the serious stifled ash that extremely easily causes air preheater as bigger than normal in amount of ammonia slip in technique.
To this, introduced the technology of low-temperature denitration, its reaction temperature is between 160 ℃-240 ℃, and after reaction bed is arranged in deduster, floor space is little, and furnace outage time is at 7-10 days.But the catalyst of low-temperature denitration has strict requirement to the dust-laden in flue gas and sulfur content, therefore mostly can only be arranged in after desulfurization.Yet the flue-gas temperature after desulfurization only has 50 ℃-70 ℃, need extraneous thermal source by flue gas to 160 ℃, in concrete technology flow process, bring difficulty.
Summary of the invention
The technical problem to be solved in the present invention is large in order to overcome traditional flue denitrating system occupation of land volume, and blowing out improvement cost is high and be unfavorable for energy-conservation defect, and a kind of intelligent low-temperature denitrating system is provided, and is applicable in industrial boiler system.
The present invention solves 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 feature is, between described air preheater and described deduster, be connected with an energy saver, between described deduster and described chimney, be provided with a low-temperature denitration unit, described low-temperature denitration unit and described energy saver are all 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 connecting 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, on the front side pipeline of described First Heat Exchanger, described the second heat exchanger and described energy saver and/or rear side pipeline, be equipped with a thermo detector.
Positive progressive effect of the present invention is: the catalyst reaction temperatures of intelligent low-temperature denitrating system of the present invention is at 160 ℃-200 ℃, its absorption tower is arranged in the back-end ductwork of boiler, and the volume on absorption tower is little of taking large quantity space, low-temperature denitration does not need boiler body to change, and transformation process only needs blowing out about 7 days.Described low-temperature denitrifying system has adopted the energy saver of Intelligent automatic after air preheater before deduster, reduced the flue gas loss of boiler in completing the process of denitration simultaneously, has taken into account energy-conservation requirement.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of traditional flue denitrating system.
Fig. 2 is the schematic diagram of intelligent low-temperature denitrating system of the present invention.
The specific embodiment
Mode below by embodiment further illustrates the present invention, but does not therefore limit the present invention among described scope of embodiments.
As shown in Figure 2, intelligent low-temperature denitrating system of the present invention comprises a boiler 1, an economizer 2, an air preheater 4, a deduster 5 and the chimney 7 connecting 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 are all 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 connecting 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 exchange heat effectively by the water supply system of described boiler.Enter approximately 300 ℃-400 ℃ of the flue-gas temperatures of energy saver 9, and the flue-gas temperature that enters the second heat exchanger 11 after low-temperature denitration is still about 160 ℃ of left and right.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 extend 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, make approximately 85 ℃ of left and right of exhaust gas temperature of finally being discharged by chimney 7, meet the requirement of energy-conserving and environment-protective.
In addition, due to lower through First Heat Exchanger 10 flue-gas temperature out after desulfurization, approximately 50 ℃-70 ℃, such temperature cannot meet low-temperature denitration reaction temperature (approximately 160 ℃-200 ℃ of catalyst reaction temperatures after this.Therefore, in low-temperature denitrifying system of the present invention, First Heat Exchanger 10 is connected with the boiler circuit of described boiler, by high-quality the drawing gas in described boiler steam and water circuit, high-temperature steam heats this flue gas, make its temperature be increased to 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 circulating pump 92,112 and several thermal detectors to the pipeline of the water supply system of described boiler.At First Heat Exchanger 10, to the pipeline of the boiler circuit of described boiler, be provided with a steam control valve 101.Circulating pump 92,112 can be realized the medium circulation in heat-exchanging loop effectively, and the flow that steam control valve 101 can control medium, described thermal detector can be monitored the temperature of heat-exchanging loop medium, and convenient operation is controlled.In addition, on the front side pipeline of First Heat Exchanger 10, the second heat exchanger 11 and energy saver 9 and/or rear side pipeline, be equipped with a thermo detector 91,111, in order to monitor the turnover flue-gas temperature of relevant device.Described thermal detector in whole low-temperature denitrifying system and described thermo detector, all for the temperature at real-time monitored pipeline each point place, make whole system operation steady and smooth more.
In addition, preferably, energy saver 9 is an Intelligent full-automatic boiler energy-saving control equipment, and its structure is similar to the utility model patent that applicant's license notification number is CN201779641U, repeats no more herein.
According to the structure of low-temperature denitrifying system described above, its whole technological process is: after boiler 1 afterbody air preheater 4, install energy saver 9 additional, 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 in former boiler steam and water circuit, steam turbine is bled and controlling steam flow by steam control valve 101, flue-gas temperature is reached more than 160 ℃.Now, flue gas enters the out of stock device 8 of low temperature and can effectively realize low-temperature denitration reaction.
Then, the flue gas of process denitration enters the second heat exchanger 11, after the water supply system heat exchange with described boiler, the flue-gas temperature after denitration is down to 85 ℃, finally by chimney, is discharged, thereby completes whole service flow process.
All above processes, and the action of all parts, carry out automated intelligent control by master controller 12 and computer 13 work stations, to realize whole flow process unmanned.
Intelligent low-temperature denitrating system of the present invention has met the very strict service condition of low-temperature denitration, has avoided again using outside combustion gas, but has used high-quality drawing gas in generating set boiler circuit.This flow process has reduced the cigarette temperature before desulfurization, has reduced desulfurization cooling water inflow, and has farthest made up owing to adopting high-quality drawing gas to cause the thermodynamic equilibrium of generating set boiler circuit.In addition, after denitration, the flue-gas temperature that enters chimney is controlled to 85 ℃ of left and right, thereby has promoted the cigarette ability of pulling out of flue gas, solved chimney and emitted this insoluble environmental issue of white cigarette.
Although more than described the specific embodiment of the present invention, it will be understood by those of skill in the art that these only illustrate, protection scope of the present invention is limited by appended claims.Those skilled in the art is not deviating under the prerequisite of principle of the present invention and essence, can make various changes or modifications to these embodiments, but these changes and modification all fall into protection scope of the present invention.
Claims (5)
1. an 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, between described air preheater and described deduster, be connected with an energy saver, between described deduster and described chimney, be provided with a low-temperature denitration unit, described low-temperature denitration unit and described energy saver are all 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 connecting 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. the intelligent low-temperature denitrating system as described in claim 2-4 any one, is characterized in that, on the front side pipeline of described First Heat Exchanger, described the second heat exchanger and described energy saver and/or rear side pipeline, is equipped with a thermo detector.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210356933.5A CN103657405A (en) | 2012-09-21 | 2012-09-21 | Intelligent low-temperature denitration system |
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| CN201210356933.5A CN103657405A (en) | 2012-09-21 | 2012-09-21 | Intelligent low-temperature denitration system |
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| CN103657405A true CN103657405A (en) | 2014-03-26 |
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| CN201210356933.5A Pending CN103657405A (en) | 2012-09-21 | 2012-09-21 | Intelligent low-temperature denitration system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103977664A (en) * | 2014-05-16 | 2014-08-13 | 山西清泽环境科技有限公司 | Flue gas desulfurization, denitration and dust removal method |
| CN105749740A (en) * | 2016-04-27 | 2016-07-13 | 武汉凯比思电力设备有限公司 | Alkali recovery boiler low-temperature denitration system and process |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0731845A (en) * | 1993-06-28 | 1995-02-03 | Mitsubishi Heavy Ind Ltd | Cooling method of leaking ammonia recovering apparatus |
| CN1301584A (en) * | 1999-12-30 | 2001-07-04 | 赵善茂 | Complex utilization method for boiler fume |
| CN101785969A (en) * | 2010-03-03 | 2010-07-28 | 王向明 | Method of flue gas purification and system thereof |
| CN202177093U (en) * | 2011-05-19 | 2012-03-28 | 中国电力工程顾问集团华东电力设计院 | Multi-level efficient displacement type fume waste-heat utilization system |
| CN202844881U (en) * | 2012-09-21 | 2013-04-03 | 上海阳高新能源科技有限公司 | Intelligent low-temperature denitration system |
-
2012
- 2012-09-21 CN CN201210356933.5A patent/CN103657405A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0731845A (en) * | 1993-06-28 | 1995-02-03 | Mitsubishi Heavy Ind Ltd | Cooling method of leaking ammonia recovering apparatus |
| CN1301584A (en) * | 1999-12-30 | 2001-07-04 | 赵善茂 | Complex utilization method for boiler fume |
| CN101785969A (en) * | 2010-03-03 | 2010-07-28 | 王向明 | Method of flue gas purification and system thereof |
| CN202177093U (en) * | 2011-05-19 | 2012-03-28 | 中国电力工程顾问集团华东电力设计院 | Multi-level efficient displacement type fume waste-heat utilization system |
| CN202844881U (en) * | 2012-09-21 | 2013-04-03 | 上海阳高新能源科技有限公司 | Intelligent low-temperature denitration system |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103977664A (en) * | 2014-05-16 | 2014-08-13 | 山西清泽环境科技有限公司 | Flue gas desulfurization, denitration and dust removal method |
| CN105749740A (en) * | 2016-04-27 | 2016-07-13 | 武汉凯比思电力设备有限公司 | Alkali recovery boiler low-temperature denitration system and process |
| CN105749740B (en) * | 2016-04-27 | 2018-06-19 | 武汉凯比思电力设备有限公司 | Alkali recovery boiler low-temperature denitrifying system and technique |
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