JPH0938466A - Reducing agent injecting device for denitrifying device - Google Patents
Reducing agent injecting device for denitrifying deviceInfo
- Publication number
- JPH0938466A JPH0938466A JP7198488A JP19848895A JPH0938466A JP H0938466 A JPH0938466 A JP H0938466A JP 7198488 A JP7198488 A JP 7198488A JP 19848895 A JP19848895 A JP 19848895A JP H0938466 A JPH0938466 A JP H0938466A
- Authority
- JP
- Japan
- Prior art keywords
- reducing agent
- boiler
- air
- exhaust gas
- denitration
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000003638 chemical reducing agent Substances 0.000 title claims abstract description 82
- 238000002347 injection Methods 0.000 claims abstract description 17
- 239000007924 injection Substances 0.000 claims abstract description 17
- 238000001704 evaporation Methods 0.000 claims abstract description 13
- 239000007864 aqueous solution Substances 0.000 claims description 26
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims description 9
- 235000011114 ammonium hydroxide Nutrition 0.000 claims description 9
- WTHDKMILWLGDKL-UHFFFAOYSA-N urea;hydrate Chemical compound O.NC(N)=O WTHDKMILWLGDKL-UHFFFAOYSA-N 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 claims description 7
- 239000007789 gas Substances 0.000 abstract description 31
- 230000008020 evaporation Effects 0.000 abstract description 7
- 239000002912 waste gas Substances 0.000 abstract 2
- 239000000243 solution Substances 0.000 abstract 1
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 24
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 17
- 229910021529 ammonia Inorganic materials 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 230000003197 catalytic effect Effects 0.000 description 4
- 238000000605 extraction Methods 0.000 description 4
- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 description 3
- 229910052921 ammonium sulfate Inorganic materials 0.000 description 3
- 235000011130 ammonium sulphate Nutrition 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 3
- 238000007865 diluting Methods 0.000 description 3
- 239000012897 dilution medium Substances 0.000 description 3
- 230000006698 induction Effects 0.000 description 3
- 239000002609 medium Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 238000005485 electric heating Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000001603 reducing effect Effects 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 230000008016 vaporization Effects 0.000 description 2
- PAWQVTBBRAZDMG-UHFFFAOYSA-N 2-(3-bromo-2-fluorophenyl)acetic acid Chemical compound OC(=O)CC1=CC=CC(Br)=C1F PAWQVTBBRAZDMG-UHFFFAOYSA-N 0.000 description 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 1
- 239000001166 ammonium sulphate Substances 0.000 description 1
- 239000004202 carbamide Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000004071 soot Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 239000006200 vaporizer Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Treating Waste Gases (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、還元剤としてアン
モニア水、もしくは尿素水を使用するボイラ発電プラン
トの触媒脱硝装置に適用され、還元剤水溶液の蒸発用熱
源として空気予熱器からの熱空気を使用するようにした
還元剤注入装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is applied to a catalytic denitration device of a boiler power plant that uses ammonia water or urea water as a reducing agent, and uses hot air from an air preheater as a heat source for vaporizing a reducing agent aqueous solution. A reducing agent injection device adapted for use.
【０００２】[0002]
【従来の技術】触媒脱硝装置は、ボイラ等の煙源に含ま
れる窒素酸化物を触媒で除去低減するもので、当窒素酸
化物の還元作用にアンモニア系の物質を使用する。一般
的に、純粋アンモニアを使用する場合が多いが、ハンド
リングや安全上の理由でアンモニア水や尿素水などの水
溶液を使用することもある。これらの還元剤水溶液は、
窒素酸化物を含むボイラ排ガスと均等に混ぜるため、熱
ガスもしくは熱空気を加え気化希釈後、触媒前流で均一
に煙道内に噴射する。2. Description of the Related Art A catalytic denitration device removes and reduces nitrogen oxides contained in a smoke source such as a boiler with a catalyst, and uses an ammonia-based substance for the reducing action of the nitrogen oxides. In general, pure ammonia is often used, but an aqueous solution such as ammonia water or urea water may be used for handling and safety reasons. These reducing agent aqueous solutions are
In order to mix it evenly with the boiler exhaust gas containing nitrogen oxides, hot gas or hot air is added to evaporate and dilute it, and then it is uniformly injected into the flue with the catalyst upstream.
【０００３】従来のこのような還元剤水溶液を蒸発させ
る熱源及び希釈媒体として、大きく分類して次の２通り
の方法があった。As a conventional heat source and a diluting medium for evaporating such a reducing agent aqueous solution, there are roughly classified the following two methods.
【０００４】（１）ボイラ排ガス系から抽出した排ガス
の熱を利用する方法。(1) A method of utilizing heat of exhaust gas extracted from a boiler exhaust gas system.
【０００５】（２）電気加熱器で熱した大気を使用する
方法。(2) A method of using the atmosphere heated by an electric heater.
【０００６】図２は上記（１）の方法を適用したボイラ
発電プラントにおける還元剤注入装置のシステム系統図
である。図において、１はボイラ、２は触媒脱硝装置、
３は空気予熱器、４は煙道、６は還元剤水溶液供給管、
７は蒸発器、８は還元剤分配管寄せ、９は誘引ファン、
１０は押込み通風機、１１は空気供給管、１２は還元剤
供給管、１４は排ガス抽出管である。FIG. 2 is a system diagram of a reducing agent injection device in a boiler power plant to which the method (1) is applied. In the figure, 1 is a boiler, 2 is a catalytic denitration device,
3 is an air preheater, 4 is a flue, 6 is a reducing agent aqueous solution supply pipe,
7 is an evaporator, 8 is a reducing agent distribution pipe, 9 is an induction fan,
Reference numeral 10 is a forced draft fan, 11 is an air supply pipe, 12 is a reducing agent supply pipe, and 14 is an exhaust gas extraction pipe.
【０００７】このような図２に示すシステムでは、押込
み通風機１０から空気が空気予熱器３で加熱され、空気
供給管１１よりボイラ１に供給され、ボイラ１からの排
ガスは脱硝装置２で窒素酸化物が除去され、煙道４から
空気予熱器３に入り、ここで空気と熱交換した後、煙突
より排出される。In such a system as shown in FIG. 2, the air from the forced draft fan 10 is heated by the air preheater 3 and is supplied to the boiler 1 through the air supply pipe 11, and the exhaust gas from the boiler 1 is converted into nitrogen by the denitration device 2. Oxides are removed and enter the air preheater 3 through the flue 4, where they exchange heat with the air and are then discharged from the chimney.
【０００８】ボイラ１からの３００度Ｃから４００度Ｃ
の熱排ガスは脱硝装置２上流側、もしくは下流側の煙道
４から抽出管１４を通って誘引ファン９で抽出され、蒸
発器７に導かれる。蒸発器７内では、還元剤水溶液供給
管６で導かれた水溶液還元剤を、脱硝に必要な量、霧状
にスプレイし、排ガスの熱量で還元剤水溶液は気化され
る。その後、気化された還元剤は、供給管１２を通り、
還元剤分配管寄せ８に送られ、排ガスに均一に混合させ
る。300 ° C to 400 ° C from the boiler 1
The hot exhaust gas is extracted from the flue gas 4 on the upstream side or the downstream side of the denitration device 2 through the extraction pipe 14 by the induction fan 9 and guided to the evaporator 7. In the evaporator 7, the aqueous solution reducing agent introduced through the reducing agent aqueous solution supply pipe 6 is sprayed in the form of mist in an amount necessary for denitration, and the reducing agent aqueous solution is vaporized by the heat amount of the exhaust gas. Then, the vaporized reducing agent passes through the supply pipe 12,
The reducing agent distribution pipe 8 is sent to the exhaust gas and uniformly mixed with the exhaust gas.
【０００９】このとき気化後の希釈還元剤温度は、プラ
ント燃料に硫黄分を含まない天然ガス等のボイラ燃焼排
ガスの抽出で、硝安を生成しない２００度Ｃの温度以上
になるよう、また、硫黄分を含む油等のボイラ燃焼排ガ
ス抽出で硫安を生成しない２５０度Ｃの温度以上になる
よう運用させる。これは、還元剤蒸発系統内にある流量
計エレメント、ダンパ、及び還元剤注入ノズル等に硝安
や硫安付着で作動不良を起こさないような温度である。At this time, the temperature of the diluting reducing agent after vaporization is set to a temperature of 200 ° C. or higher at which no ammonium nitrate is produced by extraction of boiler combustion exhaust gas such as natural gas which does not contain sulfur in the plant fuel. It is operated at a temperature of 250 ° C or higher at which ammonium sulphate is not generated by extraction of boiler combustion exhaust gas such as oil containing minerals. This is a temperature at which a malfunction does not occur due to deposition of ammonium sulfate or ammonium sulfate on the flow meter element, damper, reducing agent injection nozzle, etc. in the reducing agent evaporation system.
【００１０】さらに、本方式は、石炭焚きボイラ排ガス
など、高濃度の煤煙を含む排ガスを処理する脱硝装置に
適用するには、排ガス排出口にてダストを十分除去しな
い限り、ファン等の磨耗、ダストの蒸発器沈降があるた
め、実際的には適用不可能である。Further, this system is applicable to a denitration device for treating an exhaust gas containing a high concentration of soot such as a coal-fired boiler exhaust gas, unless the dust is sufficiently removed at the exhaust gas outlet, the wear of the fan, etc. Not practically applicable due to vaporizer settling of dust.
【００１１】図３は前述の（２）の方法を適用した還元
剤注入装置のシステム系統図である。このシステムで
は、符号１乃至４、６乃至８、１０乃至１２は前述の図
１と同じ構成であり、詳しい説明は省略するがこのよう
な脱硝装置において、大気を押し込みファン１０’で押
し込みし、電気加熱器１１で加熱し、配管１５を通して
蒸発器７へ供給する。蒸発器７では前述のように還元剤
が気化し、供給管１２により還元剤分配管寄せ８に供給
される。このとき、蒸発媒体が空気のため上述のような
還元剤と窒素酸化物の温度は１３０度Ｃ程度まで下げら
れる。しかしながら、電気加熱器１１で大気温度より、
還元剤蒸発器７入口温度３００度Ｃまで昇温する必要が
あるので、大きな電力を必要とし、プラント効率の低下
になっていた。FIG. 3 is a system diagram of a reducing agent injection device to which the method (2) is applied. In this system, reference numerals 1 to 4, 6 to 8, 10 to 12 have the same configurations as those in FIG. 1 described above, and although detailed description is omitted, in such a denitration device, the atmosphere is pushed in by a fan 10 ', It is heated by the electric heater 11 and supplied to the evaporator 7 through the pipe 15. In the evaporator 7, the reducing agent is vaporized as described above and is supplied to the reducing agent distribution pipe header 8 through the supply pipe 12. At this time, since the evaporation medium is air, the temperatures of the reducing agent and the nitrogen oxide as described above are lowered to about 130 ° C. However, with the electric heater 11,
Since it is necessary to raise the temperature of the reducing agent evaporator 7 at the inlet to 300 ° C., a large amount of electric power is required and the plant efficiency is reduced.
【００１２】[0012]
【発明が解決しようとする課題】上述したような従来の
技術によるボイラプラントの触媒脱硝装置において還元
剤水溶液を蒸発し、注入する装置は、図２に示すボイラ
燃焼排ガス利用のシステムの場合、アンモニア化合物生
成防止のため必要抽出ガス量が大きくファン消費電力が
大きくなり、又、図３に示す大気加熱方式の場合、電気
加熱器電力消費が大きくなる問題があった。The apparatus for evaporating and injecting the reducing agent aqueous solution in the catalytic denitration apparatus of the boiler plant according to the above-mentioned conventional technology is ammonia in the case of the system using the boiler combustion exhaust gas shown in FIG. There is a problem that the amount of extracted gas required for preventing compound formation is large and the power consumption of the fan is large, and in the case of the atmospheric heating system shown in FIG. 3, the electric power consumption of the electric heater is large.
【００１３】[0013]
【課題を解決するための手段】本発明はこのような課題
を解決するために、ボイラ発電プラントに適用される脱
硝装置用還元剤注入装置において、脱硝用の還元剤とし
てアンモニア水を使用し、ボイラ発電プラントに設置の
空気予熱器出口の熱空気を還元剤水溶液蒸発に利用する
ものである。更に、還元剤として尿素水を使用する注入
装置も提供する。In order to solve such a problem, the present invention uses ammonia water as a reducing agent for denitration in a reducing agent injection device for a denitration apparatus applied to a boiler power plant. Hot air at the outlet of the air preheater installed in the boiler power plant is used for evaporation of the reducing agent aqueous solution. Furthermore, an injection device using urea water as a reducing agent is also provided.
【００１４】即ち、本発明は、（１）ボイラ排ガス煙道
に空気予熱器を設け、同ボイラに供給する空気を同排ガ
スで昇温するボイラ発電プラントに適用される脱硝装置
に脱硝用還元剤を注入する装置と、還元剤水溶液を加熱
源により蒸発させ、前記注入装置に供給する装置とより
なる脱硝装置用還元剤注入装置において、前記還元剤と
してアンモニア水を使用すると共に前記加熱源として前
記空気予熱器出口の熱空気を使用したことを特徴とする
脱硝装置用還元剤注入装置を提供する。That is, the present invention provides (1) a denitrification reducing agent for a denitrification apparatus applied to a boiler power plant in which an air preheater is provided in a boiler exhaust gas flue and the air supplied to the boiler is heated by the exhaust gas. In a reducing agent injecting device for a denitration device, which comprises an injecting device and an apparatus for evaporating a reducing agent aqueous solution by a heating source and supplying the same to the injecting device, ammonia water is used as the reducing agent and the heating source is used as the heating source. Provided is a reducing agent injection device for a denitration device, which uses hot air at the outlet of an air preheater.
【００１５】（２）更に、前述の（１）の発明におい
て、前記還元剤として尿素水を使用したことを特徴とす
る脱硝装置用還元剤注入装置も提供する。(2) Further, in the invention of the above (1), there is also provided a reducing agent injecting device for a denitration device, wherein urea water is used as the reducing agent.
【００１６】本発明はこのような装置であるので、その
（１）の発明では、還元剤供給装置において還元剤水溶
液を加熱して蒸発させる。この加熱による蒸発はボイラ
発電プラントの空気予熱器出口からの熱空気を抽出、例
えば、２５０℃〜３００℃の熱空気を抽出し、蒸発器に
送り、この蒸発器に還元剤水溶液、即ち、アンモニア水
を導き、スプレイすることにより蒸発させて注入装置へ
送る。注入装置では、供給装置から気化したアンモニア
水を例えば、還元剤分配管寄せ、等により脱硝装置の入
口煙道内に注入し、排ガスと混合し、脱硝装置において
排ガス中から窒素酸化物を除去する。Since the present invention is such an apparatus, in the invention of (1), the reducing agent supply apparatus heats and evaporates the reducing agent aqueous solution. The evaporation due to this heating extracts hot air from the air preheater outlet of the boiler power plant, for example, hot air at 250 ° C to 300 ° C is extracted and sent to the evaporator, and the reducing agent aqueous solution, that is, ammonia, is fed to the evaporator. Water is directed and evaporated by spraying and sent to the injector. In the injection device, the ammonia water vaporized from the supply device is injected into the inlet flue of the denitration device by, for example, reducing agent distribution piping, mixed with the exhaust gas, and the nitrogen oxides are removed from the exhaust gas in the denitration device.
【００１７】このような注入装置であれば、還元剤蒸発
媒体が空気のため、付着の原因になるアンモニア化合物
の生成が無く、また蒸発器出口希釈還元剤温度を例え
ば、１３０℃程度に低く設定できるため、従来の排ガス
を導入する方法、電気加熱による方法に較べ、通風機等
の動力が少くてすみ、少ない風量で効率的に還元剤水溶
液を蒸発できる。With such an injection device, since the reducing agent evaporating medium is air, there is no formation of ammonia compounds that cause adhesion, and the evaporator outlet dilution reducing agent temperature is set to a low value of, for example, about 130 ° C. Therefore, compared with the conventional method of introducing exhaust gas and electric heating, less power is required for the ventilator and the like, and the reducing agent aqueous solution can be efficiently evaporated with a small amount of air.
【００１８】（２）の発明では、還元剤として従来用い
ていた尿素水を用いて、従来よりも小さな動力で注入す
ることができ、（１）と同様の作用、効果を奏するもの
である。In the invention of (2), urea water, which has been conventionally used as a reducing agent, can be injected with a smaller power than in the conventional case, and the same action and effect as in (1) can be obtained.
【００１９】[0019]
【発明の実施の形態】以下、本発明の実施の形態につい
て図面に基づいて具体的に説明する。図１は本発明の実
施の一形態に係る脱硝装置用還元剤注入装置のシステム
系統図である。図において１はボイラ、２は脱硝装置、
３は空気予熱器、４は煙道、５は誘引通風器、６は還元
剤水溶液供給管、７は蒸発器、８は還元剤分配管寄せ、
９は還元剤タンクであり、アンモニア系の水溶液が入っ
ている。１０は押込み通風機、１１は空気供給管、１２
は還元剤供給管、１３は配管である。Embodiments of the present invention will be specifically described below with reference to the drawings. FIG. 1 is a system diagram of a reducing agent injection device for a denitration device according to an embodiment of the present invention. In the figure, 1 is a boiler, 2 is a denitration device,
3 is an air preheater, 4 is a flue, 5 is a draft fan, 6 is a reducing agent aqueous solution supply pipe, 7 is an evaporator, 8 is a reducing agent distribution pipe,
A reducing agent tank 9 contains an ammonia-based aqueous solution. 10 is a forced draft fan, 11 is an air supply pipe, 12
Is a reducing agent supply pipe, and 13 is a pipe.
【００２０】このような構成のシステムにおいて、脱硝
装置２は、ボイラ１からの排ガス中の窒素酸化物を取り
除く装置で、煙道４に組み込まれ、窒素酸化物を除去し
た後、空気予熱器３で熱交換し、煙突より排出される。
一方、ボイラ１へは押込み送風機１０からの空気が空気
予熱器３で排ガスの熱に昇温され、導入される。In the system having such a structure, the denitration device 2 is a device for removing nitrogen oxides in the exhaust gas from the boiler 1 and is incorporated in the flue 4 to remove the nitrogen oxides and then the air preheater 3 Heat is exchanged at and is discharged from the chimney.
On the other hand, the air from the forced draft blower 10 is heated to the heat of the exhaust gas by the air preheater 3 and introduced into the boiler 1.
【００２１】脱硝するための還元剤水溶液は、アンモニ
ア系の水溶液であり、アンモニア水や尿素水が用いら
れ、蒸発及び希釈するため空気予熱器３出口の誘因通風
機５で配管１３を通し、２５０℃〜３００℃の熱空気を
抽出し、蒸発器７に送る。一方、還元剤タンク９内の還
元剤水溶液は、還元剤水溶液供給管６を通じ蒸発器７内
でスプレイされる。ここで熱空気によって気化、希釈さ
れた還元剤は、還元剤供給管１２通り、約１３０℃とな
り還元剤分配管寄せ８を通じ煙道内に排ガスと均一に混
合させる。The reducing agent aqueous solution for denitration is an ammonia-based aqueous solution, and aqueous ammonia or urea water is used. For evaporating and diluting, the reducing agent aqueous solution is passed through the pipe 13 by the inducing fan 5 at the outlet of the air preheater 3, The hot air of ℃ to 300 ℃ is extracted and sent to the evaporator 7. On the other hand, the reducing agent aqueous solution in the reducing agent tank 9 is sprayed in the evaporator 7 through the reducing agent aqueous solution supply pipe 6. Here, the reducing agent vaporized and diluted by the hot air passes through the reducing agent supply pipe 12 and reaches about 130 ° C., and is uniformly mixed with the exhaust gas through the reducing agent distribution pipe 8 into the flue.
【００２２】このように本発明の実施の形態では、ボイ
ラ発電プラントから発生する窒素酸化物を低減する脱硝
装置の還元剤水溶液注入システムにおいて、ボイラプラ
ントの空気予熱器２出口空気をこの還元剤水溶液の蒸
発、かつ希釈媒体に使ったものである。As described above, in the embodiment of the present invention, in the reducing agent aqueous solution injection system of the denitration device for reducing the nitrogen oxides generated from the boiler power generation plant, the outlet air of the air preheater 2 of the boiler plant is supplied with this reducing agent aqueous solution. It was used for the evaporation and dilution medium of.
【００２３】前述のボイラプラントの脱硝装置用還元剤
注入装置によれば、例えば、１５０ＭＷ出力の油焚きボ
イラで、脱硝率９０％の脱硝装置に、濃度３０％のアン
モニア水を使用したと仮定する。図２に示すようにボイ
ラ排ガスを希釈媒体として使う場合、誘引ファン９が１
１５ＫＷの電力を必要とし、また、図３に示すように希
釈媒体として大気を使い電気加熱器１１を使用する場
合、押し込みファン１０’で５０ＫＷ、電気加熱器１１
で１，０５０ＫＷの電力が必要となる。一方、本実施の
形態を採用すると、誘引ファン５の８５ＫＷの電力消費
量のみですむ。According to the reducing agent injection device for the denitration device of the boiler plant described above, it is assumed that, for example, in an oil-fired boiler having a power output of 150 MW, ammonia water having a concentration of 30% is used for the denitration device having a denitration rate of 90%. . When the boiler exhaust gas is used as a dilution medium as shown in FIG.
When the electric heater 11 is used by using the atmosphere as a dilution medium as shown in FIG. 3 and requires an electric power of 15 KW, the pushing fan 10 ′ has an electric heater of 50 KW.
Therefore, 1,050 KW of electric power is required. On the other hand, if this embodiment is adopted, only 85 KW of power consumption of the attraction fan 5 is required.
【００２４】[0024]
【発明の効果】以上、具体的に説明したように、本発明
の脱硝装置用還元剤注入装置は要するに、ボイラ発電プ
ラントに適用される脱硝装置用還元剤注入装置におい
て、脱硝用の還元剤としてアンモニアを使用し、ボイラ
発電プラントに設置の空気予熱器出口の熱空気を還元剤
水溶液蒸発に利用することを特徴とし、更に、還元剤と
して尿素水を使用する注入装置も提供するので、従来よ
り用いられているアンモニア水や尿素水を使用して電気
加熱器を用いることなく、少ないファン消費電力ですむ
ものである。As described above in detail, the reducing agent injecting device for the denitration device of the present invention is basically used as a reducing agent for denitration in a reducing agent injecting device for a denitration device applied to a boiler power plant. Ammonia is used, and the hot air at the outlet of the air preheater installed in the boiler power plant is used for evaporation of the reducing agent aqueous solution.Furthermore, since an injection device using urea water as a reducing agent is also provided, It is possible to use a small amount of fan power consumption without using an electric heater by using the aqueous ammonia or urea used.
【図１】本発明の実施の一形態に係る脱硝装置用還元剤
注入装置のシステム系統図である。FIG. 1 is a system diagram of a reducing agent injecting device for a denitration device according to an embodiment of the present invention.
【図２】従来の脱硝装置用還元剤注入装置のシステム系
統図で、ボイラ排ガスの熱を利用する例を示す。FIG. 2 is a system diagram of a conventional reducing agent injection device for a denitration device, showing an example of using heat from a boiler exhaust gas.
【図３】従来の脱硝装置用還元剤注入装置のシステム系
統図で、電気加熱による例を示す。FIG. 3 is a system diagram of a conventional reducing agent injection device for a denitration device, showing an example of electric heating.
１ ボイラ ２ 脱硝装置 ３ 空気予熱器 ４ 煙道 ５ 誘引通風機 ６ 還元剤水溶液供給管 ７ 蒸発器 ８ 還元剤分配管寄せ ９ 還元剤タンク １０ 押込み送風機 １１ 空気供給管 １２ 還元剤供給管 １３ 配管 1 Boiler 2 Denitration device 3 Air preheater 4 Flue 5 Induction fan 6 Reducing agent aqueous solution supply pipe 7 Evaporator 8 Reducing agent distribution pipe 9 Reducing agent tank 10 Air blower 11 Air supply pipe 12 Reducing agent supply pipe 13 Piping
Claims (2)
同ボイラに供給する空気を同排ガスで昇温するボイラ発
電プラントに適用される脱硝装置に脱硝用還元剤を注入
する装置と、還元剤水溶液を加熱源により蒸発させ、前
記注入装置に供給する装置とよりなる脱硝装置用還元剤
注入装置において、前記還元剤としてアンモニア水を使
用すると共に前記加熱源として前記空気予熱器出口の熱
空気を使用したことを特徴とする脱硝装置用還元剤注入
装置。1. An air preheater is provided in the boiler exhaust gas flue,
A device for injecting a denitration reducing agent into a denitration device applied to a boiler power plant that heats the air supplied to the boiler with the same exhaust gas, and a device for evaporating the reducing agent aqueous solution by a heating source and supplying it to the injection device. A reducing agent injecting device for a denitration device, wherein ammonia water is used as the reducing agent and hot air at the outlet of the air preheater is used as the heating source.
を特徴とする請求項１記載の脱硝装置用還元剤注入装
置。2. The reducing agent injecting device for a denitration device according to claim 1, wherein urea water is used as the reducing agent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19848895A JP3354756B2 (en) | 1995-08-03 | 1995-08-03 | Reducing agent injection device for denitration equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19848895A JP3354756B2 (en) | 1995-08-03 | 1995-08-03 | Reducing agent injection device for denitration equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0938466A true JPH0938466A (en) | 1997-02-10 |
| JP3354756B2 JP3354756B2 (en) | 2002-12-09 |
Family
ID=16391957
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19848895A Expired - Lifetime JP3354756B2 (en) | 1995-08-03 | 1995-08-03 | Reducing agent injection device for denitration equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3354756B2 (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001241603A (en) * | 2000-02-28 | 2001-09-07 | Miura Co Ltd | Denitration device for boiler |
| WO2006061912A1 (en) * | 2004-12-10 | 2006-06-15 | Babcock-Hitachi Kabushiki Kaisha | Exhaust smoke denitrating apparatus and method of exhaust smoke denitration |
| JP2010249407A (en) * | 2009-04-15 | 2010-11-04 | Mitsubishi Heavy Ind Ltd | Coal burning boiler and plant equipped with the same |
| CN107158948A (en) * | 2017-06-12 | 2017-09-15 | 盐城诚达环保工程有限公司 | Denitrification reducing agent gas ammonia is produced and denitrating flue gas integrated apparatus |
| CN110170248A (en) * | 2019-02-02 | 2019-08-27 | 昆山市三维换热器有限公司 | Natural wind heats denitrating system |
| WO2022181586A1 (en) | 2021-02-24 | 2022-09-01 | 三菱重工業株式会社 | Heat exchange piping configuration for vaporizing ammonia in denitrification device |
| CN116617839A (en) * | 2023-05-22 | 2023-08-22 | 辽宁大唐国际锦州热电有限责任公司 | Urea hydrolysis denitration dilution air device of thermal power factory |
-
1995
- 1995-08-03 JP JP19848895A patent/JP3354756B2/en not_active Expired - Lifetime
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001241603A (en) * | 2000-02-28 | 2001-09-07 | Miura Co Ltd | Denitration device for boiler |
| WO2006061912A1 (en) * | 2004-12-10 | 2006-06-15 | Babcock-Hitachi Kabushiki Kaisha | Exhaust smoke denitrating apparatus and method of exhaust smoke denitration |
| US7722844B2 (en) | 2004-12-10 | 2010-05-25 | Babcock-Hitachi Kabushiki Kaisha | Exhaust smoke denitrating apparatus and method of exhaust smoke denitration |
| JP2010249407A (en) * | 2009-04-15 | 2010-11-04 | Mitsubishi Heavy Ind Ltd | Coal burning boiler and plant equipped with the same |
| CN107158948A (en) * | 2017-06-12 | 2017-09-15 | 盐城诚达环保工程有限公司 | Denitrification reducing agent gas ammonia is produced and denitrating flue gas integrated apparatus |
| CN110170248A (en) * | 2019-02-02 | 2019-08-27 | 昆山市三维换热器有限公司 | Natural wind heats denitrating system |
| WO2022181586A1 (en) | 2021-02-24 | 2022-09-01 | 三菱重工業株式会社 | Heat exchange piping configuration for vaporizing ammonia in denitrification device |
| CN116617839A (en) * | 2023-05-22 | 2023-08-22 | 辽宁大唐国际锦州热电有限责任公司 | Urea hydrolysis denitration dilution air device of thermal power factory |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3354756B2 (en) | 2002-12-09 |
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