CN105020700B - 一种层燃锅炉组合脱硝装置与方法 - Google Patents
一种层燃锅炉组合脱硝装置与方法 Download PDFInfo
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- CN105020700B CN105020700B CN201510402824.6A CN201510402824A CN105020700B CN 105020700 B CN105020700 B CN 105020700B CN 201510402824 A CN201510402824 A CN 201510402824A CN 105020700 B CN105020700 B CN 105020700B
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- 238000010304 firing Methods 0.000 title claims abstract description 26
- 229910002089 NOx Inorganic materials 0.000 claims abstract description 37
- 239000007789 gas Substances 0.000 claims abstract description 33
- OKTJSMMVPCPJKN-UHFFFAOYSA-N carbon Chemical compound data:image/svg+xml;base64,<?xml version='1.0' encoding='iso-8859-1'?>
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N carbon monoxide Chemical compound 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[O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 37
- 239000003546 flue gases Substances 0.000 claims description 34
- XSQUKJJJFZCRTK-UHFFFAOYSA-N urea Chemical compound 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O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 2
- 235000019504 cigarettes Nutrition 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000003134 recirculating Effects 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 206010002660 Anoxia Diseases 0.000 description 1
- 241000976983 Anoxia Species 0.000 description 1
- FGIUAXJPYTZDNR-UHFFFAOYSA-N Potassium nitrate Chemical compound 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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
一种层燃锅炉组合脱硝装置与方法,属于燃煤层燃锅炉污染物排放控制领域,以实现层燃锅炉NOx达标排放。炉膛内前拱下方设有气化室,炉膛隔墙上设有煤气出口,炉排下方由前至后依次设有气化风室、第一、第二、第三、第四及第五风室,炉膛前墙上位于前拱上方设有二次风口,炉膛的出口与带加速段的卧式旋风分离器的入口连通,带加速段的卧式旋风分离器底部通过回料阀与炉膛下部主燃区连通,带加速段的卧式旋风分离器依次与对流排管、省煤器、空气预热器连通,空气预热器与除尘器连通,除尘器与再循环风机和引风机连通,再循环风机与烟气通道连通,送风机与气化风室、第一、第二、第三、第四、第五风室及二次风口连通。本发明用于层燃锅炉组合脱硝。
Description
一种层燃锅炉组合脱硝装置与方法
技术领域
[0001] 本发明涉及层燃炉控制N〇x排放的装置及方法,属于燃煤层燃锅炉污染物排放控 制领域。
背景技术
[0002] 层燃炉常在城镇居民集中区使用,且多为低空排放,使得工业锅炉对周围环境,特 别是城镇环境污染尤为严重,而N0X在污染物中占据的份额较大,因此经济有效地降低层燃 炉队^排放,对于减轻大气污染具有十分重要的意义。
[0003] 目前层燃锅炉的NOx排放浓度都不能达到GB13271-2014的排放标准,单纯的SNCR 也难以达标,尾部采用SCR虽然能够达标,但投资及运行成本高,用户难以接受,因此,有必 要同时实施多种措施,来满足GB13271-2014的排放标准。
[0004] 现有的层燃炉低N0X燃烧技术主要包括:(1) “燃料分级”燃烧技术,如授权公告号 为CN202993174U、授权公告日为2013年06月12日、名称为《一种燃煤燃气组合型高效低排放 层燃燃烧装置》公开了 一种在层燃炉中采用外加燃气再燃来降低NOx排放的方法,通过引入 外来燃气(天然气、煤气),在主燃区上方形成富燃料区,强化还原N0X。这种方法采用了天然 气作为再燃气体,天然气的价格很高,使得运行成本大幅增加,在实际应用中难以实施。(2) 炉内SNCR脱硝技术,即在炉内喷尿素与已生成的NOx反应生成N2,降低NOx排放,但是由于层 燃炉炉膛截面大,喷入炉膛的尿素很难与炉膛整个截面上的烟气均匀混合,导致脱硝效果 差,脱硝率一般只有40%左右。
发明内容
[0005] 本发明的目的是提供一种层燃锅炉组合脱硝装置与方法,以实现层燃锅炉NOx达 标排放。
[0006] 实现上述目的,本发明的技术方案是:
[0007] 本发明的一种层燃锅炉组合脱硝装置,包括气化室、炉膛隔墙、烟气通道、炉排、炉 膛前拱、炉膛、喷嘴、带加速段的卧式旋风分离器、对流排管、省煤器、空气预热器、送风机、 再循环风机、除尘器、引风机、回料阀及六个风室;所述六个风室分别是气化风室、第一风 室、第二风室、第三风室、第四风室及第五风室;
[0008] 所述炉膛内的前下部设有气化室,气化室由炉膛前拱、炉膛隔墙及炉膛两侧墙围 成,炉膛隔墙上设有多个煤气出口,气化室通过所述多个煤气出口与炉膛下部主燃区相通, 炉排下方由前至后依次设有气化风室、第一风室、第二风室、第三风室、第四风室及第五风 室,所述气化风室设置在气化室下方,所述第一风室和第二风室设置在炉膛下部主燃区下 方;位于炉膛前拱上方设有二次风口;炉膛的出口与所述带加速段的卧式旋风分离器的入 口连通,带加速段的卧式旋风分离器的入口处设有所述喷嘴,带加速段的卧式旋风分离器 的底部通过所述回料阀与炉膛下部主燃区连通,带加速段的卧式旋风分离器的出口与所述 对流排管的入口相通,对流排管的出口与所述省煤器的入口连通,省煤器的出口与所述空 气预热器的入口连通,空气预热器的出口通过管路与所述除尘器的入口连通,除尘器的出 口分别通过管路与所述再循环风机和引风机的入口连通,再循环风机的出口与设置在炉排 下方的所述烟气通道的入口连通,烟气通道与第一风室及第二风室相通,所述送风机的出 口分别通过管路与每个风室的进风口及二次风口连通。
[0009] 本发明利用层燃锅炉组合脱硝装置实现层燃锅炉组合脱硝的方法,所述方法包括 如下步骤:
[0010] 步骤一:煤自煤斗进入气化室内,煤层在气化室对应的炉排上着火燃烧,在缺氧条 件下热解气化产生煤气,煤气经设置在炉膛隔墙上的煤气出口进入炉膛下部主燃区,在还 原性气氛下实现燃气再燃,还原已生成的N0X;与此同时,所述煤气化后生成的煤焦随炉排 移动至第一风室、第二风室上方的炉排上高温燃烧,燃烧温度达到1300°c〜140CTC,这样会 产生NOx,为了抑制NOx的生成量,分别向第一风室6和第二风室7内通入冷烟气,使之在缺氧 条件下燃烧,使煤焦燃烧温度低于ll〇〇°C,抑制NOx生成量;由于缺氧,所以燃烧过程中产生 C0、H2及CxHy可燃气体,与气化室2产生的煤气汇合,在还原性气氛下二次燃烧,从而进一步 降低NOx排放,煤焦在小于1100°C下和缺氧的环境下燃烧;
[0011] 步骤二:从炉膛前拱上方的二次风口向炉膛下部主燃区的上方通入二次风,使二 次风与未燃尽的可燃成分充分混合燃烧,将未完全燃烧的可燃气体及颗粒进一步燃烧,实 现空气分级燃烧,降低NOx排放;
[0012] 步骤三:烟气经炉膛的上部四周水冷壁换热后,由炉膛的出口流出进入带加速段 的卧式旋风分离器内,在带加速段的卧式旋风分离器的入口处设置喷嘴向烟气中喷入雾化 后尿素水溶液进行SNCR脱硝,所述尿素水溶液的浓度为5〜10%,喷入的尿素液滴在高温烟气 的加热下转化为气态,与高速旋转的烟气在所述卧式旋风分离器内充分混合,在950〜1050 °(:温区范围内脱硝率大于60%;同时,卧式旋风分离器分离出的未完全燃尽的颗粒经回料阀 送回炉膛下部主燃区内再燃;经分离后的烟气进入对流排管换热,之后进入省煤器,经省煤 器吸收烟气热量后进入空气预热器内,再经空气预热器换热后,进入除尘器除尘处理,除尘 后的烟气分成两部分,其中一部分经再循环风机及烟气通道送入第一风室及第二风室,用 于控制炉排上煤焦的燃烧温度,其余的烟气经引风机送入脱硫塔后进入烟囱排入大气中。
[0013] 本发明相对于现有技术的有益效果是:
[0014] (1)炉膛内的前侧(在层燃炉前部)设置一个气化室,煤在气化室内产生煤气代替 天然气,节省了能源,降低了运行成本;煤气进入炉膛下部主燃区,并在还原性气氛下二次 再燃,实现“燃料分级”燃烧,降低N〇x的排放;
[0015] (2)第一风室和第二风室均设置在炉膛下部主燃区,采用冷烟气再循环,再循环烟 气量占总烟气量的10-30%,减少了主燃区进风量,降低了主燃区煤层及其上方燃烧温度,使 得该区在缺氧条件下燃烧,抑制了氮氧化物的生成,同时产生的大量的C〇、H2、CxHy可燃气体 与气化室产生的燃气汇合,在还原性气氛下二次再燃,还原部分N〇x,进一步降低N〇x;
[0016] (3)从炉排下方向六个风室通入的一次风量占总风量的70〜80%,从炉膛前拱上方 的二次风口向炉膛下部主燃区上方通入的二次风量占总风量的2〇〜3〇%,且分别送风,实现 “空气分级”燃烧,降低N0X的排放;
[0017] (4)在炉膛的出口处设置一个带加速段的卧式旋风分离器,将未完全燃烧的颗粒 分离回送炉膛再燃,降低飞灰含碳量,飞灰含碳量由过去的2〇〜3〇%降至10〜丨5%,锅炉热效率 提闻2〜3%;
[0018] (5)在所述卧式旋风分离器入口处喷尿素水溶液进行SNCR脱硝,尿素与高温烟气 在分离器内强烈均匀混合,在950~1050°C温区范围内脱硝率大于60%,大于目前在炉膛截面 上喷尿素脱硝率只有4〇%左右的现状。
[0019] 上述综合脱硝措施的处理效果是NOx排放浓度低于150mg/m3,远低于GB13271-2014规定的NOx排放浓度。
附图说明
[0020] 图1是本发明的层燃锅炉组合脱硝装置的主视结构示意图,炉排为链条炉排;
[0021] 图2是图1的A-A剖视图;
[0022] 图3是图1的M向视图;
[0023]图4是本发明的层燃锅炉组合脱硝装置的主视结构示意图,炉排为往复炉排。
[0024] 图中:主燃区1、气化室2、炉膛隔墙3、煤气出口 4、气化风室5、第一风室6、第二风室 7、第三风室8、第四风室9、第五风室10、进风口 11、烟气通道12、链条炉排13、炉膛前拱14、炉 膛后拱15、二次风口 16、炉膛17、折焰角18、喷嘴19、带加速段的卧式旋风分离器20、对流排 管21、省煤器22、空气预热器23、送风机24、再循环风机25、除尘器26、引风机27、炉膛前墙 28、回料阀29、脱硫塔30、尾部烟道31、煤斗32、烟囱33。
具体实施方式
[0025]
具体实施方式一:如图1〜图4所示,一种层燃锅炉组合脱硝装置,包括气化室2、炉 膛隔墙3、烟气通道12、炉排13、炉膛前拱14、炉膛17、喷嘴19、带加速段的卧式旋风分离器 20、对流排管21、省煤器22、空气预热器23、送风机24、再循环风机25、除尘器26、引风机27、 回料阀29及六个风室;所述六个风室分别是气化风室5、第一风室6、第二风室7、第三风室8、 第四风室9及第五风室10;
[0026] 所述炉膛17内的前下部设有气化室2,气化室2由炉膛前拱14、炉膛隔墙3及炉膛两 侧墙围成,炉膛隔墙3上设有多个煤气出口 4,气化室2通过所述多个煤气出口 4与炉膛17下 部主燃区1相通(多个煤气出口 4沿炉膛隔墙3左侧至右侧均布开设,使气化室2产生的煤气 进入炉膛17下部主燃区1,在还原性气氛下实现燃气再燃,还原已生成的NOx),炉排13下方 由前至后依次设有气化风室5、第一风室6、第二风室7、第三风室8、第四风室9及第五风室 10,所述气化风室5设置在气化室2下方,所述第一风室6和第二风室7设置在炉膛17下部主 燃区1下方(第一风室6、第二风室7沿炉排13宽度方向均匀通入冷烟气,使之与送入的空气 均匀混合后进入炉膛17下部主燃区1,使炉膛17下部主燃区1缺氧,进而控制燃烧温度,抑制 NOx生成量);位于炉膛前拱14上方设有二次风口 16 (二次风送入炉膛17下部主燃区1的上方 参与燃烧,将未完全燃烧的可燃气体及颗粒进一步燃尽,实现空气分级燃烧,降低N0x排 放);炉膛17的出口与所述带加速段的卧式旋风分离器20的入口连通,带加速段的卧式旋风 分离器20的入口处设有所述喷嘴19 (在带加速段的卧式旋风分离器20的入口利用喷嘴I9喷 尿素进行SNCR高效脱硝处理),带加速段的卧式旋风分离器20的底部通过所述回料阀29与 炉膛17下部主燃区1连通,带加速段的卧式旋风分离器20的出口与所述对流排管21 (为现有 技术)的入口相通,对流排管21的出口与所述省煤器22的入口连通,省煤器22的出口与所述 空气预热器23的入口连通(省煤器22和空气预热器23均设置在尾部烟道31内),空气预热器 23的出口通过管路与所述除尘器26的入口连通,除尘器26的出口分别通过管路与所述再循 环风机25和引风机27的入口连通(引风机27的出口与脱硫塔30相通,脱硫塔30出口与烟囱 33连通),再循环风机25的出口与设置在炉排13下方的所述烟气通道12的入口连通,烟气通 道12与第一风室6及第二风室7相通,所述送风机24的出口分别通过管路与每个风室的进风 口 11及二次风口 16连通。
[0027]本实施方式中的带加速段的卧式旋风分离器20结构及运行参数己在公开号为CN 101786050B、公开日为2011年4月6日的发明专利《循环流化床带加速段的水冷或汽冷高温 卧式旋风分离器》中公开。
[0028]具体实施方式二:如图1和图4所示,具体实施方式一所述的层燃锅炉组合脱硝装 置,所述炉排13为链条炉排或往复炉排,所述炉膛隔墙3下表面与链条炉排上表面之间的间 距Hl=450〜550mm(优选500mm),所述炉膛隔墙3的后侧面的竖直延伸面与往复炉排上表面的 相交线至炉膛隔墙3的下表面之间的间距H2=450〜550mm (优选500mm)。如此设置,一方面可 以阻挡燃气向下扩散,另一方面气化室2产生的热量与外部隔离,用于煤更好的气化,此外, 还方便检修。
[0029]具体实施方式三:如图1和图4所示,具体实施方式一所述的层燃锅炉组合脱硝装 置,所述炉膛17的出口处位于带加速段的卧式旋风分离器20下方设有折焰角18。效果是:一 方面使得炉膛17火焰充满度好,强化辐射换热;另一方面形成卧式旋风分离器2的加速段, 保证卧式旋风分离器2的分离效率大于95%,同时对尿素与烟气的充分混合非常有利。
[0030]
具体实施方式四:如图1〜图4所示,一种利用具体实施方式一、二或三所述的装置 实现层燃锅炉组合脱硝的方法,所述方法包括如下步骤:
[0031] 步骤一:煤自煤斗32进入气化室2内,煤层在气化室2对应的炉排13上着火燃烧,在 缺氧条件下热解气化产生煤气,煤气经设置在炉膛隔墙3上的煤气出口 4进入炉膛17下部主 燃区1 (炉膛17下部主燃区1位于第一风室6、第二风室7的炉排13上方),在还原性气氛下实 现燃气再燃,还原己生成的NOx;与此同时,所述煤气化后生成的煤焦随炉排13移动至第一 风室6、第二风室7上方的炉排13上高温燃烧,燃烧温度达到1300°C〜1400°C,这样会产生(大 量的)NOx,为了抑制NOx的生成量,分别向第一风室6和第二风室7 (沿炉排13宽度方向均匀 通入)内通入冷烟气,使之在缺氧条件下燃烧,使煤焦燃烧温度低于1100°C,抑制NOx生成 量;由于缺氧,所以燃烧过程中产生(大量的)C0、H2及CxHy可燃气体,与气化室2产生的煤气 汇合,在还原性气氛下二次燃烧(实现“燃料分级再燃”),从而进一步降低NOx排放,煤焦在 小于1100°C下和缺氧的环境下燃烧(使得煤焦在炉排13上燃烧时间延长,为了保证燃料燃 尽,需要增加炉排13长度,在原有炉排13的基础上增加0.5〜1.0米);
[0032] 步骤二:从炉膛前拱14上方的二次风口 16向炉膛17下部主燃区1的上方通入二次 风,使二次风与未燃尽的可燃成分充分混合燃烧,将未完全燃烧的可燃气体及颗粒进一步 燃烧,实现空气分级燃烧,降低N〇x排放;
[0033] 步骤三:烟气经炉膛17的上部四周水冷壁换热后,由炉膛17的出口流出进入带加 速段的卧式旋风分离器20内,在带加速段的卧式旋风分离器20的入口处设置喷嘴19向烟气 中喷入雾化后尿素水溶液进行SNCR脱硝,所述尿素水溶液的浓度为5〜10%,喷入的尿素液滴 在高温烟气(温度为950〜1050°C)的加热下转化为气态,与高速旋转的烟气在所述卧式旋风 分离器2〇内充分混合,在950〜1050 °C温区范围内脱硝率大于60% (这在循环流化床中已经被 广泛采用,是现有成熟技术);同时,卧式旋风分离器20分离出的未完全燃尽的颗粒经回料 阀29送回炉膛17下部主燃区1内再燃(降低飞灰含碳量,提高锅炉热效率;飞灰含碳量由过 去的20〜30%降至HK15%左右,锅炉热效率提高2〜3%);经分离后的烟气进入对流排管21换 热,之后进入省煤器22,经省煤器22吸收烟气热量后进入空气预热器23内,再经空气预热器 23换热后,进入除尘器26除尘处理,除尘后的烟气分成两部分,其中一部分经再循环风机25 及烟气通道12送入第一风室6及第二风室7,用于控制炉排13上煤焦的燃烧温度,其余的烟 气经引风机27送入脱硫塔30后进入烟囱33排入大气中。
[0034]具体实施方式五:如图1和图4所示,具体实施方式四所述的层燃锅炉组合脱硝的 方法,步骤二中,所述从炉排13下方向六个风室通入的一次风量占总风量的70〜80%,所述从 炉膛前拱14上方的二次风口 16向炉膛17下部主燃区1上方通入的二次风量占总风量的20〜 30%〇
[0035]具体实施方式六:如图1和图4所示,具体实施方式四或五所述的层燃锅炉组合脱 硝的方法,所述从第一风室6及第二风室7送入的再循环烟气量占总烟气量的1 〇〜30%。
[0036]以上的具体实施方式仅为本发明的一则实施例,并不用以限制本发明,凡在本发 明的精神及原则之内所做的任何修改、等同替换、改进等,均应包含在本创作的保护范围之 内。
Claims (6)
- L 一种层燃锅炉组合脱硝装置,包括气化室(2)、炉膛隔墙(3)、烟气通道(12)、炉排 (13)、炉膛前拱(14)、炉膛(17)、喷嘴(19)、带加速段的卧式旋风分离器(20)、对流排管 (21)、省煤器(22)、空气预热器(23)、送风机(24)、再循环风机(25)、除尘器(26)、引风机 (27)、回料阀(29)及六个风室;所述六个风室分别是气化风室(5)、第一风室(6)、第二风室 (7)、第三风室⑻、第四风室⑼及第五风室(10); 其特征是:所述炉膛(17)内的前下部设有气化室(2),气化室(2)由炉膛前拱(14)、炉膛 隔墙(3)及炉膛两侧墙围成,炉膛隔墙(3)上设有多个煤气出口(4),气化室(2)通过所述多 个煤气出口(4)与炉膛(17)下部主燃区(1)相通,炉排(13)下方由前至后依次设有气化风室 (5)、第一风室(6)、第二风室(7)、第三风室(8)、第四风室(9)及第五风室(10),所述气化风 室(5)设置在气化室(2)下方,所述第一风室(6)和第二风室(7)设置在炉膛(17)下部主燃区 (1)下方;位于炉膛前拱(14)上方设有二次风口(16);炉膛(17)的出口与所述带加速段的卧 式旋风分离器(20)的入口连通,带加速段的卧式旋风分离器(20)的入口处设有所述喷嘴 (19),带加速段的卧式旋风分离器(20)的底部通过所述回料阀(29)与炉膛(17)下部主燃区 ⑴连通,带加速段的卧式旋风分离器(20)的出口与所述对流排管(21)的入口相通,对流排 管(21)的出口与所述省煤器(22)的入口连通,省煤器(22)的出口与所述空气预热器(23)的 入口连通,空气预热器(23)的出口通过管路与所述除尘器(26)的入口连通,除尘器(26)的 出口分别通过管路与所述再循环风机(25)和引风机(27)的入口连通,再循环风机(25)的出 口与设置在炉排(13)下方的所述烟气通道(12)的入口连通,烟气通道(12)与第一风室(6) 及第二风室(7)相通,所述送风机(24)的出口分别通过管路与每个风室的进风口(11)及二 次风口(16)连通。
- 2. 根据权利要求1所述的层燃锅炉组合脱硝装置,其特征是:所述炉排(13)为链条炉排 或往复炉排,所述炉膛隔墙(3)下表面与链条炉排上表面之间的间距Hl=450〜550mm,所述炉 膛隔墙(3)的后侧面的竖直延伸面与往复炉排上表面的相交线至炉膛隔墙(3)的下表面之 间的间距H2=450〜550mm。
- 3. 根据权利要求1所述的层燃锅炉组合脱硝装置,其特征是:所述炉膛(17)的出口处位 于带加速段的卧式旋风分离器(20)下方设有折焰角(18)。
- 4. 一种利用权利要求1、2或3所述的装置实现层燃锅炉组合脱硝的方法,其特征是:所 述方法包括如下步骤: 步骤一:煤自煤斗(32)进入气化室(2)内,煤层在气化室(2)对应的炉排(13)上着火燃 烧,在缺氧条件下热解气化产生煤气,煤气经设置在炉膛隔墙(3)上的煤气出口(4)进入炉 膛(17)下部主燃区(1),在还原性气氛下实现燃气再燃,还原已生成的NOx;与此同时,所述 煤气化后生成的煤焦随炉排(13)移动至第一风室(6)、第二风室(7)上方的炉排(13)上高温 燃烧,燃烧温度达到130(TC〜1400°C,这样会产生NOx,为了抑制NOx的生成量,分别向第一风 室(6)和第二风室(7)内通入冷烟气,使之在缺氧条件下燃烧,使煤焦燃烧温度低于1 l〇(TC, 抑制NOx生成量;由于缺氧,所以燃烧过程中产生CO、H2及CxHy可燃气体,与气化室⑵产生的 煤气汇合,在还原性气氛下二次燃烧,从而进一步降低NOx排放,煤焦在小于1100°C下和缺 氧的环境下燃烧; 步骤二:从炉膛前拱(14)上方的二次风口(16)向炉膛(17)下部主燃区(1)的上方通入 二次风,使二次风与未燃尽的可燃成分充分混合燃烧,将未完全燃烧的可燃气体及颗粒进 一步燃烧,实现空气分级燃烧,降低NOx排放; 步骤三:烟气经炉膛(17)的上部四周水冷壁换热后,由炉膛(17)的出口流出进入带加 速段的卧式旋风分离器(20)内,在带加速段的卧式旋风分离器(20)的入口处设置喷嘴(19) 向烟气中喷入雾化后尿素水溶液进行SNCR脱硝,所述尿素水溶液的浓度为5〜10%,喷入的尿 素液滴在高温烟气的加热下转化为气态,与高速旋转的烟气在所述卧式旋风分离器(2〇)内 充分混合,在950〜1050°C温区范围内脱硝率大于60%;同时,卧式旋风分离器(20)分离出的 未完全燃尽的颗粒经回料阀(29)送回炉膛(17)下部主燃区(1)内再燃;经分离后的烟气进 入对流排管(21)换热,之后进入省煤器(22),经省煤器(22)吸收烟气热量后进入空气预热 器(23)内,再经空气预热器(23)换热后,进入除尘器(26)除尘处理,除尘后的烟气分成两部 分,其中一部分经再循环风机(25)及烟气通道(12)送入第一风室(6)及第二风室(7),用于 控制炉排(13)上煤焦的燃烧温度,其余的烟气经引风机(27)送入脱硫塔(30)后进入烟囱 (33)排入大气中。
- 5. 根据权利要求4所述的层燃锅炉组合脱硝的方法,其特征是:步骤二中,所述从炉排 (13)下方向六个风室通入的一次风量占总风量的70〜80%,所述从炉膛前拱(14)上方的二次 风口(16)向炉膛(17)下部主燃区(1)上方通入的二次风量占总风量的20〜30%。
- 6. 根据权利要求4或5所述的层燃锅炉组合脱硝的方法,其特征是:所述从第一风室(6) 及第二风室(7)送入的再循环烟气量占总烟气量的1〇〜30%。
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