CN105222114A - The low NO of economizer sectional boiler full load xdevice and remodeling method - Google Patents
The low NO of economizer sectional boiler full load xdevice and remodeling method Download PDFInfo
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- CN105222114A CN105222114A CN201510701175.XA CN201510701175A CN105222114A CN 105222114 A CN105222114 A CN 105222114A CN 201510701175 A CN201510701175 A CN 201510701175A CN 105222114 A CN105222114 A CN 105222114A
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Abstract
<b> the present invention relates to a kind of economizer sectional boiler full load low </b><bGreatT.Gre aT.GTNOX</b><bGr eatT.GreaT.GT device and remodeling method.Existing </b><bGreatT.Gre aT.GTSCR</b><bGr eatT.GreaT.GT denitrification apparatus boiler load lower than </b><bGreatT.Gre aT.GT50%</b><bGr about eatT.GreaT.GT and below time reaction efficiency degradation, the requirement of pollution discharging thing discharge standard can not be met.The present invention's composition comprises: boiler (</b><bGreatT.Gre aT.GT15</b><bGre atT.GreaT.GT), described boiler tail has </b><bGreatT.Gre aT.GTSCR</b><bGr eatT.GreaT.GT denitration reaction district (</b><bGreatT.Gre aT.GT8</b><bGrea tT.GreaT.GT), high temperature section economizer (</b><bGreatT.Gre aT.GT4</b><bGrea tT.GreaT.GT) and middle-temperature section economizer (</b><bGreatT.Gre aT.GT5</b><bGrea tT.GreaT.GT) are installed above </b><bGreatT.Gre aT.GTSCR</b><bGr eatT.GreaT.GT denitration reaction district, middle-temperature section economizer is connected with high temperature section economizer with pipeline by valve, low-temperature zone economizer (</b><bGreatT.Gre aT.GT7</b><bGrea tT.GreaT.GT) is installed below </b><bGreatT.Gre aT.GTSCR</b><bGr eatT.GreaT.GT denitration reaction district, low-temperature zone economizer is by valve and pipeline and described middle-temperature section economizer, high temperature section economizer connects, flue gas temperature measurement device (</b><bGreatT.Gre aT.GT19</b><bGre atT.GreaT.GT) is installed below middle-temperature section economizer, the entrance of low-temperature zone economizer is connected with water supply system (</b><bGreatT.Gre aT.GT18</b><bGre atT.GreaT.GT) by pipeline, air preheater (</b><bGreatT.Gre aT.GT14</b><bGre atT.GreaT.GT) is installed below described boiler tail.The present invention is used for the low </b><bGreatT.Gre aT.GTNO of economizer sectional boiler full load
x</b><bGreatT.Gre aT.GT device.</b>
Description
technical field:
the present invention relates to denitration technology field, be specifically related to the low NO of a kind of economizer sectional boiler full load
x
device and remodeling method.
background technology:
along with national environmental protection is to fired power generating unit NO
x
the restriction of discharge is more and more stricter, and thermal power plant's air needs to realize NO under full load
x
discharge is all lower than 100mg/Nm
3
, existing SCR denitration device boiler load lower than about 50% and below time reaction efficiency degradation, the requirement of pollution discharging thing discharge standard can not be met.According to the requirement of " fossil-fuel power plant atmospheric pollutant emission standard " that country newly puts into effect, for new-built unit and existing unit, the boiler controller system except " W " type flame combustion is adopted to need to realize NO
x
discharge is lower than 100mg/Nm
3
limit value, the boiler controller system for " W " type flame combustion needs to realize NO
x
discharge is lower than 200mg/Nm
3
limit value, the denitrating technique of current most of boiler is SCR method denitration technology, and the key element of SCR method denitration technology is catalyst, and the effecting reaction temperature range of general catalyst is about 300 ~ 400 DEG C; Outside above-mentioned reaction temperature, efficiency can significantly reduce, according to the requirement in national environmental protection portion, Denitration in Boiler system should be able to continue safe operation between boiler minimum steady combustion load and any operating mode of BMCR, but due to the inherent characteristic of catalyst, spray ammonia temperature needs to control between 300 ~ 400 DEG C, and current most unit all can not meet above-mentioned code requirement.
summary of the invention:
the object of this invention is to provide the low NO of a kind of economizer sectional boiler full load
x
device and remodeling method.
above-mentioned object is realized by following technical scheme:
the low NO of a kind of economizer sectional boiler full load
x
device, its composition comprises: boiler, described boiler tail has SCR denitration reaction zone, high temperature section economizer and middle-temperature section economizer are installed above described SCR denitration reaction zone, described middle-temperature section economizer is connected with described high temperature section economizer with pipeline by valve, below described SCR denitration reaction zone, low-temperature zone economizer is installed, described low-temperature zone economizer is by valve and pipeline and described middle-temperature section economizer, described high temperature section economizer connects, below described middle-temperature section economizer, flue gas temperature measurement device is installed, the entrance of described low-temperature zone economizer is connected with water supply system by pipeline, below described boiler tail, air preheater is installed.
the described low NO of economizer sectional boiler full load
x
device, the outlet of described middle-temperature section economizer is connected by pipeline A with the entrance of described high temperature section economizer, described high temperature section economizer exit is connected with described middle-temperature section economizer entrance by arm, described arm is separately installed with flow divider, flowmeter A, return pump, described low-temperature zone economizer exit is connected by pipeline B with described middle-temperature section economizer entrance, described pipeline B is separately installed with flow divider, flowmeter B, described low-temperature zone economizer exit and described middle-temperature section economizer exit, by described pipeline A between described high temperature section economizer entrance, rapid cut-off valve, triple valve connects.
the described low NO of economizer sectional boiler full load
x
device, under described boiler minimum steady combustion load ~ BMCR load condition, described high temperature section economizer exit flue-gas temperature is no more than 300 ~ 400 DEG C, denitrating catalyst optimum temperature interval.
the described low NO of economizer sectional boiler full load
x
device, described high temperature section economizer and described middle-temperature section economizer arrange 3:1 ~ 1:1 by a certain percentage, and described low-temperature zone economizer and described middle-temperature section economizer arrange 1:3 ~ 1:1 by a certain percentage.
a kind of economizer sectional boiler full load low NOX device and remodeling method, the method comprises the steps: it is first carried out transforming high temperature section economizer as by former boiler economizer, middle-temperature section economizer, low-level (stack-gas) economizer three sections, middle-temperature section economizer exit is connected by pipeline with high temperature section economizer entrance, high temperature section economizer exit arranges an arm and is connected with middle-temperature section economizer entrance, arm arranges flow divider and flowmeter, return pump, middle-temperature section economizer downstream arranges flue gas temperature measurement device, economizer adds level, one-level low-temperature zone economizer is added after SCR denitration reaction zone, low-temperature zone economizer is connected respectively by pipeline and valve with between middle-temperature section economizer and high temperature section economizer, low-temperature zone economizer exit and middle-temperature section economizer entrance are by pipeline and flow divider, flowmeter connects, low-temperature zone economizes coal export and middle-temperature section economizer exit, pipeline is passed through between high temperature section economizer entrance, rapid cut-off valve, triple valve connects,
high temperature section economizer exit arranges a lateral and is connected with middle-temperature section economizer entrance, branch line arranges flow divider, flow is taken into account and is returned pump, middle-temperature section economizer downstream arranges cigarette temperature and surveys device, flow divider and flow divider feed back corresponding adjustment aperture separately by middle-temperature section economizer downstream flue gas temperature measurement value, control high temperature section economizer to return water pipe and return the water yield and low-temperature zone economizer exit pipe divides flowing water to be mixed into the flow of middle-temperature section economizer entrance, two flowmeters are measured water from high temperature section economizer lateral and low-temperature zone portion isocon in real time and are entered the flow of middle-temperature section, guarantee that middle-temperature section economizer runs under safety condition, can ensure that again middle-temperature section economizer downstream cigarette temperature is in SCR denitration reactive adaptation temperature (300 ~ 400 DEG C) scope.
beneficial effect:
1. the invention solves SCR denitration under current boiler full load can not the problem of real-time high-efficiency denitration reaction, under boiler minimum steady combustion load ~ BMCR load, can reach NO
x
the index of low emission, meets national environmental standard.
the present invention both can ensure the raising of SCR inlet flue gas temperature under boiler at low load, be able to the bringing normally into operation of SCR denitration, ensure that economizer can not be overheated and do not produce boiling (vaporization) phenomenon simultaneously, ensure that in economizer, discharge within the specific limits again, also can ensure under boiler high load capacity operating mode simultaneously, SCR reaction zone inlet flue gas temperature can not be too high, and arrange low-temperature zone economizer and contribute to reducing the deficient enthalpy of boiler water, is conducive to boiler hydrodynamics stability.
the present invention adopts valve switch, return pump, flow divider, aperture is by middle-temperature section economizer downstream cigarette temperature feedback, control high temperature section economizer exit part water and the mixing of low-temperature zone economizer exit part water return middle-temperature section economizer entrance, middle-temperature section economizer exit is connected with pipeline between low-temperature zone and high temperature section economizer, realize middle-temperature section economizer caloric receptivity at low load to reduce even can not absorb heat and don't middle-temperature section economizer can be caused overheated, like this by reducing SCR reaction zone upstream economizer caloric receptivity, improve the flue-gas temperature of economizer exit, remain on SCR reaction zone downstream economizer simultaneously and absorb the non-absorption portion heat of Upstream section.
the present invention due to SCR reaction zone cigarette temperature cooling extent less, whole economizer system is made to keep original heat absorption to be similar to share by this structure, simultaneously under high loads by the switch of valve, each section of economizer is all put into operation circulation status, keep economizer exit cigarette temperature to there will not be overheating problem, can run by normal table.
the SCR that the present invention is applicable under can solving boiler full load mode sprays ammonia temperature requirement problem, to realize under boiler full load mode denitration reaction normally and efficiently, economizer water side can be avoided to occur boiling phenomenon simultaneously, keep the normal table under boiler full load mode to run.
under boiler at low load operating mode of the present invention, open the flow divider of high temperature section economizer exit branch line, aperture is by middle-temperature section economizer downstream cigarette temperature feedback, return pump and low-temperature zone economizer exit rapid cut-off valve and thus bypasses valve, pass through flow divider, flow is taken into account and is returned pump and control high temperature section and go out saliva and low-temperature zone and go out discharge after saliva mixing in middle-temperature section economizer, ensure both to have there will not be the overheated and inner cavitation of economizer by controlling certain flow, also in low as far as possible reduction middle-temperature section economizer, current are logical absorbs heat, ensure the optimum range of middle-temperature section outlet cigarette temperature at denitration reaction.
under boiler high load capacity operating mode of the present invention, close the flow divider of high temperature section economizer exit branch line, return pump and low-temperature zone economizer exit rapid cut-off valve, standard-sized sheet thus bypasses valve, under recovering normal boiler working condition, economizer runs the method for operation circulated piecemeal, namely economizer flows through middle-temperature section economizer by low-temperature zone economizer and flow to high temperature section economizer again, ensure that middle-temperature section economizer exit cigarette temperature there will not be excessive temperature by the normal circulation heat absorption of middle-temperature section economizer, cigarette temperature can be in the preference temperature interval of denitration reaction.
accompanying drawing illustrates:
accompanying drawing 1 is structural representation of the present invention.
accompanying drawing 2 is former boiler structure schematic diagrames.
in figure: 9 is former boiler economizers.
detailed description of the invention:
embodiment 1:
the low NO of a kind of economizer sectional boiler full load
x
device, its composition comprises: boiler 15, described boiler tail has SCR denitration reaction zone 8, high temperature section economizer 4 and middle-temperature section economizer 5 are installed above described SCR denitration reaction zone, described middle-temperature section economizer is connected with described high temperature section economizer with pipeline by valve, below described SCR denitration reaction zone, low-temperature zone economizer 7 is installed, described low-temperature zone economizer is by valve and pipeline and described middle-temperature section economizer, described high temperature section economizer connects, below described middle-temperature section economizer, flue gas temperature measurement device 19 is installed, the entrance of described low-temperature zone economizer is connected with water supply system 18 by pipeline, air preheater 14 is installed below described boiler tail.
embodiment 2:
the low NO of economizer sectional boiler full load according to embodiment 1
x
device, the outlet of described middle-temperature section economizer is connected by pipeline A10 with the entrance of described high temperature section economizer, described high temperature section economizer exit is connected with described middle-temperature section economizer entrance by arm 13, described arm is separately installed with flow divider 1, flowmeter A16, return pump 6, described low-temperature zone economizer exit is connected by pipeline B12 with described middle-temperature section economizer entrance, described pipeline B is separately installed with flow divider 3, flowmeter B17, described low-temperature zone economizer exit and described middle-temperature section economizer exit, by described pipeline A between described high temperature section economizer entrance, rapid cut-off valve 2, triple valve 11 connects.
embodiment 3:
the low NO of economizer sectional boiler full load according to embodiment 2
x
device, under described boiler minimum steady combustion load ~ BMCR load condition, described high temperature section economizer exit flue-gas temperature is no more than 300 ~ 400 DEG C, denitrating catalyst optimum temperature interval.
embodiment 4:
the low NO of economizer sectional boiler full load according to embodiment 3
x
device, described high temperature section economizer and described middle-temperature section economizer arrange 3:1 ~ 1:1 by a certain percentage, and described low-temperature zone economizer and described middle-temperature section economizer arrange 1:3 ~ 1:1 by a certain percentage.
embodiment 5:
a kind of remodeling method utilizing economizer sectional boiler full load low NOX device described in embodiment 1-4, this method is: be first carried out transforming high temperature section economizer as by former boiler economizer, middle-temperature section economizer, low-level (stack-gas) economizer three sections, middle-temperature section economizer exit is connected by pipeline with high temperature section economizer entrance, high temperature section economizer exit arranges an arm and is connected with middle-temperature section economizer entrance, arm arranges flow divider and flowmeter, return pump, middle-temperature section economizer downstream arranges flue gas temperature measurement device, economizer adds level, one-level low-temperature zone economizer is added after SCR denitration reaction zone, low-temperature zone economizer is connected respectively by pipeline and valve with between middle-temperature section economizer and high temperature section economizer, low-temperature zone economizer exit and middle-temperature section economizer entrance are by pipeline and flow divider, flowmeter connects, low-temperature zone economizes coal export and middle-temperature section economizer exit, pipeline is passed through between high temperature section economizer entrance, rapid cut-off valve, triple valve connects,
high temperature section economizer exit arranges a lateral and is connected with middle-temperature section economizer entrance, branch line arranges flow divider, flow is taken into account and is returned pump, middle-temperature section economizer downstream arranges cigarette temperature and surveys device, flow divider and flow divider feed back corresponding adjustment aperture separately by middle-temperature section economizer downstream flue gas temperature measurement value, control high temperature section economizer to return water pipe and return the water yield and low-temperature zone economizer exit pipe divides flowing water to be mixed into the flow of middle-temperature section economizer entrance, two flowmeters are measured water from high temperature section economizer lateral and low-temperature zone portion isocon in real time and are entered the flow of middle-temperature section, guarantee that middle-temperature section economizer runs under safety condition, can ensure that again middle-temperature section economizer downstream cigarette temperature is in SCR denitration reactive adaptation temperature (300 ~ 400 DEG C) scope.
Claims (5)
1. the low NO of economizer sectional boiler full load
xdevice, its composition comprises: boiler, it is characterized in that: described boiler tail has SCR denitration reaction zone, high temperature section economizer and middle-temperature section economizer are installed above described SCR denitration reaction zone, described middle-temperature section economizer is connected with described high temperature section economizer with pipeline by valve, below described SCR denitration reaction zone, low-temperature zone economizer is installed, described low-temperature zone economizer is by valve and pipeline and described middle-temperature section economizer, described high temperature section economizer connects, below described middle-temperature section economizer, flue gas temperature measurement device is installed, the entrance of described low-temperature zone economizer is connected with water supply system by pipeline, below described boiler tail, air preheater is installed.
2. the low NO of economizer sectional boiler full load according to claim 1
xdevice, is characterized in that:
The outlet of described middle-temperature section economizer is connected by pipeline A with the entrance of described high temperature section economizer, described high temperature section economizer exit is connected with described middle-temperature section economizer entrance by arm, described arm is separately installed with flow divider, flowmeter A, return pump, described low-temperature zone economizer exit is connected by pipeline B with described middle-temperature section economizer entrance, described pipeline B is separately installed with flow divider, flowmeter B, described low-temperature zone economizer exit and described middle-temperature section economizer exit, by described pipeline A between described high temperature section economizer entrance, rapid cut-off valve, triple valve connects.
3. the low NO of economizer sectional boiler full load according to claim 2
xdevice, is characterized in that: under described boiler minimum steady combustion load ~ BMCR load condition, described high temperature section economizer exit flue-gas temperature is no more than 300 ~ 400 DEG C, denitrating catalyst optimum temperature interval.
4. economizer sectional boiler full load low NOX device according to claim 3, is characterized in that:
Described high temperature section economizer and described middle-temperature section economizer arrange 3:1 ~ 1:1 by a certain percentage, and described low-temperature zone economizer and described middle-temperature section economizer arrange 1:3 ~ 1:1 by a certain percentage.
5. utilize a remodeling method for the economizer sectional boiler full load low NOX device described in claim 1-4, it is characterized in that: the method comprises the steps:
First be that former boiler economizer is carried out transforming high temperature section economizer as, middle-temperature section economizer, low-level (stack-gas) economizer three sections, middle-temperature section economizer exit is connected by pipeline with high temperature section economizer entrance, high temperature section economizer exit arranges an arm and is connected with middle-temperature section economizer entrance, arm arranges flow divider and flowmeter, return pump, middle-temperature section economizer downstream arranges flue gas temperature measurement device, economizer adds level, one-level low-temperature zone economizer is added after SCR denitration reaction zone, low-temperature zone economizer is connected respectively by pipeline and valve with between middle-temperature section economizer and high temperature section economizer, low-temperature zone economizer exit and middle-temperature section economizer entrance are by pipeline and flow divider, flowmeter connects, low-temperature zone economizes coal export and middle-temperature section economizer exit, pipeline is passed through between high temperature section economizer entrance, rapid cut-off valve, triple valve connects,
High temperature section economizer exit arranges a lateral and is connected with middle-temperature section economizer entrance, branch line arranges flow divider, flow is taken into account and is returned pump, middle-temperature section economizer downstream arranges cigarette temperature and surveys device, flow divider and flow divider feed back corresponding adjustment aperture separately by middle-temperature section economizer downstream flue gas temperature measurement value, control high temperature section economizer to return water pipe and return the water yield and low-temperature zone economizer exit pipe divides flowing water to be mixed into the flow of middle-temperature section economizer entrance, two flowmeters are measured water from high temperature section economizer lateral and low-temperature zone portion isocon in real time and are entered the flow of middle-temperature section, guarantee that middle-temperature section economizer runs under safety condition, can ensure that again middle-temperature section economizer downstream cigarette temperature is in SCR denitration reactive adaptation temperature (300 ~ 400 DEG C) scope.
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Cited By (5)
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|---|---|---|---|---|
| CN106705090A (en) * | 2016-12-02 | 2017-05-24 | 华电电力科学研究院 | SCR system based on flue gas waste heat gradient utilization and SCR denitration method |
| CN107152673A (en) * | 2017-06-06 | 2017-09-12 | 大唐贵州发耳发电有限公司 | A kind of device for improving coal-fired electric generation furnace denitration inlet flue gas temperature |
| CN108159880A (en) * | 2018-01-09 | 2018-06-15 | 杭州临江环保热电有限公司 | A kind of flue gas denitrification system |
| CN109442375A (en) * | 2018-10-09 | 2019-03-08 | 中国神华能源股份有限公司 | Boiler system |
| CN110296389A (en) * | 2019-06-30 | 2019-10-01 | 无锡华光锅炉股份有限公司 | A kind of economizer arragement construction |
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