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JP3817896B2 - Method and apparatus for measuring sulfuric anhydride in exhaust gas and sulfuric acid neutralizer - Google Patents
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JP3817896B2 - Method and apparatus for measuring sulfuric anhydride in exhaust gas and sulfuric acid neutralizer - Google Patents

Method and apparatus for measuring sulfuric anhydride in exhaust gas and sulfuric acid neutralizer Download PDF

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JP3817896B2
JP3817896B2 JP11427698A JP11427698A JP3817896B2 JP 3817896 B2 JP3817896 B2 JP 3817896B2 JP 11427698 A JP11427698 A JP 11427698A JP 11427698 A JP11427698 A JP 11427698A JP 3817896 B2 JP3817896 B2 JP 3817896B2
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Prior art keywords
exhaust gas
gas
ammonia gas
ammonia
concentration
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JPH11295293A (en
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文彦 山口
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石川島播磨重工業株式会社
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Description

【0001】
【発明の属する技術分野】
本発明は、オリマルジョン等がボイラで燃焼された後の排ガス中の無水硫酸を計測する為の無水硫酸測定方法及び装置及び排ガス中の無水硫酸中和装置に関するものである。
【0002】
【従来の技術】
オリマルジョン等の燃料を燃焼させた場合に燃焼排ガス中には所謂酸性雨の原因とされている窒素酸化物(NOx )、硫黄酸化物(SOx )が含まれている。発電設備等に於けるボイラには、燃料の燃焼により発生する排ガス中の窒素酸化物(NOx )、硫黄酸化物(SOx )を除去する為の排煙処理システムが設けられている。先ず、排煙処理システムについて図3に於いて説明する。
【0003】
この排煙処理システムは、燃料を燃焼するボイラ1と、該ボイラ1から排出される排ガス中の窒素酸化物を除去する脱硝装置2と、該脱硝装置2からの排ガスの熱回収をするエアヒータ3と、該エアヒータ3からの排ガス中のダストを除去する電気集塵器4と、該電気集塵器4から排ガスを吸引する誘引ファン6と、該誘引ファン6からの排ガス中の硫黄酸化物を除去する脱硫装置7と、脱硫直前に熱回収を行うガスヒータ8と、該ガスヒータ及び脱硫後に再加熱を行うガスヒータ9と、これら2個のガスヒータ8,9を連結して熱媒体を循環する循環パイプ10と、前記ガスヒータ9からの排ガスを大気に放出する煙突11で構成されている。
【0004】
前述した様に、ボイラ1でオリマルジョンを燃焼すると高濃度の無水硫酸(SO3 )を含む排ガスが発生する。排ガスの温度がSO3 の酸露点以下に下がると、SO3 が凝縮して硫酸となり装置を腐食するという問題がある。上記した排煙処理システムに於いては、排ガスの温度はエアヒータ3を出る迄は酸露点以上に保たれているが、これより下流側では酸露点以下に低下していく。
【0005】
前記エアヒータ3より下流側に位置する電気集塵器4、ガスヒータ7を硫酸による腐食から防止する為、電気集塵器4より上流側の煙道中に、アルカリ性のアンモニア(NH3 )、炭酸カルシウム(CaCO3 )等の中和剤を投入している。中和剤の投入量は無水硫酸を中和するに過不足ないのが好ましく、投入量が不足する場合は、未反応の無水硫酸が凝縮して硫酸となり電気集塵器4等の装置を腐食し、又過剰であると不経済であるという問題がある。
【0006】
そこで、中和剤の投入量の適正化を図る為、ボイラの負荷に応じて排ガスに含有される無水硫酸の濃度を想定し、想定量に見合った量の中和剤を投入し、更に排ガスを実際にサンプリングして排ガス中の実際の無水硫酸の濃度を測定し、投入量が適正であるかどうかを判断している。
【0007】
従来の排ガスをサンプリングして無水硫酸の濃度を測定する方法を図4に於いて説明する。
【0008】
ダクト5内の煙道にサンプリングノズル14の先端を挿入し、該サンプリングノズル14の基端は冷却コイル15に接続する。該冷却コイル15は冷却槽16の冷却媒体17に浸漬され、冷却コイル15の他端は回収器(図示せず)に接続されている。
【0009】
前記ダクト5内を300℃〜400℃の温度の排ガスが流通し、サンプリングノズル14よりサンプリングされた前記排ガスは、前記冷却コイル15を流通する過程で、90℃の前記冷却媒体17により冷却され、140℃程度に冷却される。排ガス中の無水硫酸が凝縮し、前記回収器により凝縮した無水硫酸が回収され、沈殿滴定法等により手分析で無水硫酸の量を測定していた。
【0010】
【発明が解決しようとする課題】
上記した従来の排ガス中の無水硫酸測定方法では、分析測定が連続的ではなく、回分の為、時間が掛り、中和剤の投入量を連続的に制御するデータ取得手段として使用することは難しい。又無水硫酸のサンプリング時に排ガス中に含有されるダストの影響を受け、正確な値を得るのが難しい。更に、無水硫酸の凝縮が完全であるとは保証し得ず、凝縮が充分でない場合は、やはり、正確な値が得られない。
【0011】
本発明は斯かる実情に鑑み、連続的に排ガス中の無水硫酸の量を測定できると共に、測定の信頼性、測定精度を向上させるものであり、更に連続的に得られる無水硫酸の測定結果を基に無水硫酸を中和する中和剤の投入量を制御しようとするものである。
【0012】
【課題を解決するための手段】
本発明は、抽出した排ガスに定量のアンモニアガスを反応させ、未反応アンモニアガスを検出して排ガス中の無水硫酸の濃度を検出する排ガス中の無水硫酸測定方法に係り、又排ガスの一部を連続的に抽出し、該抽出した排ガスに定流量のアンモニアガスを連続的に供給し、反応後のガスに対し赤外線吸収法によりアンモニアガスの濃度を測定する排ガス中の無水硫酸測定方法に係り、又排ガスの一部を抽出する排ガス抽出手段と、アンモニアガスを定流量供給するアンモニアガス供給手段と、前記排ガス抽出手段からの抽出排ガスとアンモニアガス供給手段からのアンモニアガスを反応させる反応器と、該反応器から送出されるガス中の未反応アンモニアガスに対して赤外線吸収法によりアンモニアガスの濃度を測定するアンモニアガス分析器と、未反応アンモニアガス濃度より排ガス中の無水硫酸を演算する演算部とを具備した排ガス中の無水硫酸測定装置に係り、更に排ガスの一部を抽出する排ガス抽出手段と、アンモニアガスを定流量供給するアンモニアガス供給手段と、前記排ガス抽出手段からの抽出排ガスとアンモニアガス供給手段からのアンモニアガスを反応させる反応器と、該反応器から送出されるガス中の未反応アンモニアガスを赤外線吸収法によりアンモニアガスの濃度を測定するアンモニアガス分析器と、未反応アンモニアガス濃度より排ガス中の無水硫酸を演算する演算部と、排ガス中に無水硫酸用中和剤を投入する中和剤投入手段とを具備し、前記演算部からの演算結果に基づき前記中和剤投入手段からの中和剤投入量を制御する排ガス中の無水硫酸中和装置に係るものであり、排ガス中の無水硫酸の濃度、量を略リアルタイムで而も連続的に測定でき、測定結果は中和剤投入量を決定するデータとして利用でき、中和剤投入を適正な量に連続的に制御することを可能とする。
【0013】
【発明の実施の形態】
以下、図面を参照しつつ本発明の実施の形態を説明する。
【0014】
図1は本発明の実施の形態に係る排ガス中の無水硫酸測定装置の概略を示すものである。
【0015】
ダクト5内を横断する様に、中和剤供給ノズル21が設けられ、該中和剤供給ノズル21は中和剤供給管20及び該中和剤供給管20に設けられた流量制御弁23を介して図示しない中和剤供給源に接続されている。前記中和剤供給ノズル21、流量制御弁23等は中和剤投入手段を構成する。又、前記ダクト5内の煙道にサンプリングノズル24が突出して設けられ、該サンプリングノズル24は反応器25に接続され、排ガス抽出手段として機能する。前記反応器25には図示しないアンモニアガス供給源からのアンモニアガス導入管28が接続され、該アンモニアガス導入管28には前記反応器25へのアンモニアの供給量を定流量に制御する流量制御弁29、該流量制御弁29の上流にはアンモニアガスの流量を検出する流量計30が設けられている。前記アンモニアガス導入管28、流量制御弁29、流量計30等はアンモニアガス供給手段を構成する。
【0016】
前記反応器25ではサンプリングノズル24で抽出された排ガスと前記アンモニアガス導入管28より供給されたアンモニアガスとが反応し、反応後のガスはアンモニアガス分析器26に送出され、更に排出ノズル27により前記煙道内に戻される。
【0017】
前記アンモニアガス分析器26では反応後のガス中のアンモニアガスの濃度を検出し、該検出結果は制御部31に入力される。該制御部31はアンモニアガスの濃度から供給したアンモニアガスに対する消費量を演算し、更に演算されたアンモニアガスの消費量から無水硫酸の量、濃度を演算する演算部を具備している。又、前記流量制御弁23、流量制御弁29は前記制御部31によって開閉し、流量調整等の制御が行われる。
【0018】
以下、図2(A)(B)を参照して作用を説明する。
【0019】
前記反応器25は温度を200℃以下の一定温度に維持されており、該反応器25に前記アンモニアガス導入管28よりアンモニアガスを導入する。アンモニアガスの導入量は計画値の無水硫酸SO3 を中和する2倍以上の定量とする。前記反応器25では無水硫酸SO3 と前記アンモニアガスNH3 とが反応し、硫安(NH42SO4 が生成する。硫安と未反応分のアンモニアガスが前記アンモニアガス分析器26に送給され、該アンモニアガス分析器26に於いて未反応アンモニアガスの濃度が測定される。
【0020】
前記アンモニアガス分析器26に於けるアンモニアガス分析は、例えば赤外線吸収法による。
【0021】
前記アンモニアガス分析器26には反応後のガスが充填される計測室があり、該計測室を横切る様に測定用の赤外レーザ光32が射出され(図2(A)参照)、前記測定室を横断した赤外レーザ光32は光量検出器(図示せず)により受光される。前記アンモニアガスは図2(B)に見られる様に、特定波長の赤外光を吸収し、この特定波長の赤外光の受光量Im を測定することでアンモニアガスの濃度、言換えればアンモニアガスの消費量を検出することができる。前記受光量Im と入射した赤外レーザ光32の光量I0 よりアンモニアガス濃度Cが、ランベルトの基本式(数1)により求めることができる。
【0022】
【数1】
n(I0/Im)=αCL
α:アンモニアガスの赤外線吸収係数
L:赤外レーザ光の測定室通過距離
C:アンモニアガス濃度
【0023】
前記アンモニアガス分析器26により検出されたアンモニアガス濃度Cは前記制御部31に入力される。該制御部31では前記アンモニアガス濃度Cより前記アンモニアガス導入管28より供給したアンモニアガス消費量を求め、該アンモニアガスの消費量に相当する排ガス中の無水硫酸の濃度、或は量を演算する。更に、演算された排ガス中の無水硫酸を中和するに必要な中和剤の量が演算され、該演算結果により前記流量制御弁23の流量制御が行われ、無水硫酸の中和に必要な適正量の中和剤が前記中和剤供給ノズル21を介して前記ダクト5内に投入される。中和剤としては、例えばアンモニアガスNH3 、炭化カルシウムCaCO3 が挙げられる。
【0024】
而して、サンプリングノズル24より排ガスを連続的に抽出し、更に前記アンモニアガス導入管28より前記反応器25に定量のアンモニアガスを連続的に供給することで排ガス中の無水硫酸の量を連続的に検出することができるので、中和剤の投入量を連続的に制御でき、常に最適な状態で無水硫酸を中和させることができる。
【0025】
【発明の効果】
以上述べた如く本発明によれば、排ガス中の無水硫酸の濃度、量を略リアルタイムで而も連続的に測定できるので、中和剤投入量を決定するデータとして利用でき、中和剤投入を適正な量に連続的に制御を可能とすると言う優れた効果を発揮する。
【図面の簡単な説明】
【図1】本発明の実施の形態に係る排ガス中の無水硫酸測定装置の概略を示す説明図である。
【図2】(A)(B)は同前本発明の実施の形態に於ける作用説明図である。
【図3】排ガス中の無水硫酸測定装置が設備される排煙処理システムの全体構成図である。
【図4】従来の排ガス中の無水硫酸測定装置の説明図である。
【符号の説明】
5 ダクト
23 流量制御弁
24 サンプリングノズル
25 反応器
26 アンモニアガス分析器
29 流量制御弁
30 流量計
31 制御部
[0001]
BACKGROUND OF THE INVENTION
TECHNICAL FIELD The present invention relates to a sulfuric anhydride measurement method and apparatus for measuring sulfuric anhydride in exhaust gas after combustion of an oligion and the like in a boiler, and a sulfuric anhydride neutralizer in exhaust gas.
[0002]
[Prior art]
When a fuel such as orimulsion is burned, the combustion exhaust gas contains nitrogen oxides (NO x ) and sulfur oxides (SO x ) that are the cause of so-called acid rain. A boiler in a power generation facility or the like is provided with a flue gas treatment system for removing nitrogen oxides (NO x ) and sulfur oxides (SO x ) in exhaust gas generated by fuel combustion. First, the smoke emission processing system will be described with reference to FIG.
[0003]
The flue gas treatment system includes a boiler 1 that burns fuel, a denitration device 2 that removes nitrogen oxides in exhaust gas discharged from the boiler 1, and an air heater 3 that recovers heat of the exhaust gas from the denitration device 2. An electric dust collector 4 for removing dust in the exhaust gas from the air heater 3, an induction fan 6 for sucking the exhaust gas from the electric dust collector 4, and sulfur oxides in the exhaust gas from the induction fan 6 A desulfurization device 7 to be removed, a gas heater 8 that recovers heat immediately before desulfurization, a gas heater 9 that reheats after the gas heater and desulfurization, and a circulation pipe that connects these two gas heaters 8 and 9 to circulate the heat medium 10 and a chimney 11 for releasing the exhaust gas from the gas heater 9 to the atmosphere.
[0004]
As described above, when the boiler 1 is combusted, the exhaust gas containing high concentration sulfuric anhydride (SO 3 ) is generated. When the temperature of the exhaust gas falls below the acid dew point of SO 3 , there is a problem that SO 3 is condensed to become sulfuric acid and corrodes the device. In the above-described flue gas treatment system, the temperature of the exhaust gas is kept above the acid dew point until it exits the air heater 3, but falls below the acid dew point on the downstream side.
[0005]
In order to prevent the electrostatic precipitator 4 and the gas heater 7 located downstream from the air heater 3 from being corroded by sulfuric acid, alkaline ammonia (NH 3 ), calcium carbonate ( A neutralizing agent such as CaCO 3 ) is used. It is preferable that the amount of the neutralizing agent input is not excessive or insufficient to neutralize the anhydrous sulfuric acid. If the input amount is insufficient, the unreacted anhydrous sulfuric acid is condensed into sulfuric acid, which corrodes the devices such as the electrostatic precipitator 4. However, there is a problem that it is uneconomical if it is excessive.
[0006]
Therefore, in order to optimize the amount of neutralizer, the concentration of sulfuric anhydride contained in the exhaust gas is assumed according to the load on the boiler, and an amount of neutralizer that matches the assumed amount is added. Is actually sampled to measure the actual concentration of sulfuric anhydride in the exhaust gas to determine whether the input is appropriate.
[0007]
A conventional method of sampling exhaust gas and measuring the concentration of sulfuric anhydride will be described with reference to FIG.
[0008]
The tip of the sampling nozzle 14 is inserted into the flue in the duct 5, and the base end of the sampling nozzle 14 is connected to the cooling coil 15. The cooling coil 15 is immersed in the cooling medium 17 of the cooling tank 16, and the other end of the cooling coil 15 is connected to a recovery device (not shown).
[0009]
An exhaust gas having a temperature of 300 ° C. to 400 ° C. circulates in the duct 5, and the exhaust gas sampled from the sampling nozzle 14 is cooled by the cooling medium 17 of 90 ° C. in the course of flowing through the cooling coil 15, It is cooled to about 140 ° C. The anhydrous sulfuric acid in the exhaust gas was condensed, and the condensed anhydrous sulfuric acid was recovered by the collector, and the amount of anhydrous sulfuric acid was measured manually by precipitation titration method or the like.
[0010]
[Problems to be solved by the invention]
In the conventional method for measuring sulfuric anhydride in exhaust gas as described above, the analytical measurement is not continuous, it takes time because of batching, and it is difficult to use as a data acquisition means for continuously controlling the amount of neutralizing agent input. . In addition, it is difficult to obtain an accurate value due to the influence of dust contained in the exhaust gas during sampling of sulfuric anhydride. Moreover, it cannot be guaranteed that the condensation of sulfuric anhydride is complete, and if the condensation is not sufficient, an accurate value is still not obtained.
[0011]
In view of such circumstances, the present invention can continuously measure the amount of sulfuric anhydride in exhaust gas, improve the measurement reliability and measurement accuracy, and further obtain the measurement results of sulfuric acid obtained continuously. It is intended to control the amount of the neutralizing agent that neutralizes sulfuric acid anhydride.
[0012]
[Means for Solving the Problems]
The present invention relates to a method for measuring anhydrous sulfuric acid in exhaust gas by reacting a certain amount of ammonia gas with extracted exhaust gas, detecting unreacted ammonia gas, and detecting the concentration of anhydrous sulfuric acid in the exhaust gas. Continuously extracting, supplying a constant flow of ammonia gas to the extracted exhaust gas, and relating to a method for measuring sulfuric anhydride in exhaust gas by measuring the concentration of ammonia gas by infrared absorption method for the gas after reaction, An exhaust gas extraction means for extracting a part of the exhaust gas; an ammonia gas supply means for supplying ammonia gas at a constant flow; a reactor for reacting the extracted exhaust gas from the exhaust gas extraction means and the ammonia gas from the ammonia gas supply means; An ammonia gas component for measuring the concentration of ammonia gas by an infrared absorption method with respect to unreacted ammonia gas in the gas sent from the reactor. And an apparatus for measuring anhydrous sulfuric acid in exhaust gas comprising an arithmetic unit for calculating sulfuric anhydride in exhaust gas from the concentration of unreacted ammonia gas, exhaust gas extraction means for extracting a part of the exhaust gas, and ammonia gas Ammonia gas supply means for supplying a flow rate, a reactor for reacting extracted exhaust gas from the exhaust gas extraction means and ammonia gas from the ammonia gas supply means, and infrared absorption of unreacted ammonia gas in the gas sent from the reactor Ammonia gas analyzer that measures the concentration of ammonia gas by the method, a calculation unit that calculates sulfuric anhydride in the exhaust gas from the unreacted ammonia gas concentration, and a neutralizer injection means that introduces a neutralizing agent for anhydrous sulfuric acid into the exhaust gas And in sulfuric anhydride in exhaust gas for controlling the amount of neutralizing agent input from the neutralizing agent input means based on the calculation result from the calculation unit Concerning the equipment, the concentration and amount of sulfuric anhydride in exhaust gas can be measured continuously in near real time, and the measurement results can be used as data for determining the amount of neutralizing agent input. It is possible to continuously control the amount.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0014]
FIG. 1 schematically shows an apparatus for measuring anhydrous sulfuric acid in exhaust gas according to an embodiment of the present invention.
[0015]
A neutralizing agent supply nozzle 21 is provided so as to cross the inside of the duct 5, and the neutralizing agent supply nozzle 21 includes a neutralizing agent supply pipe 20 and a flow rate control valve 23 provided in the neutralizing agent supply pipe 20. To a neutralizing agent supply source (not shown). The neutralizing agent supply nozzle 21, the flow control valve 23, etc. constitute neutralizing agent charging means. A sampling nozzle 24 protrudes from the flue in the duct 5, and the sampling nozzle 24 is connected to a reactor 25 and functions as an exhaust gas extraction means. An ammonia gas introduction pipe 28 from an ammonia gas supply source (not shown) is connected to the reactor 25, and the ammonia gas introduction pipe 28 is a flow rate control valve for controlling the supply amount of ammonia to the reactor 25 to a constant flow rate. 29, a flow meter 30 for detecting the flow rate of ammonia gas is provided upstream of the flow control valve 29. The ammonia gas introduction pipe 28, the flow control valve 29, the flow meter 30 and the like constitute ammonia gas supply means.
[0016]
In the reactor 25, the exhaust gas extracted by the sampling nozzle 24 reacts with the ammonia gas supplied from the ammonia gas introduction pipe 28, and the gas after the reaction is sent to the ammonia gas analyzer 26, and is further discharged by the discharge nozzle 27. Returned into the flue.
[0017]
The ammonia gas analyzer 26 detects the concentration of ammonia gas in the gas after reaction, and the detection result is input to the control unit 31. The control unit 31 includes a calculation unit that calculates the consumption amount of the supplied ammonia gas from the concentration of the ammonia gas, and further calculates the amount and concentration of sulfuric anhydride from the calculated consumption amount of the ammonia gas. The flow rate control valve 23 and the flow rate control valve 29 are opened and closed by the control unit 31, and control such as flow rate adjustment is performed.
[0018]
Hereinafter, the operation will be described with reference to FIGS.
[0019]
The reactor 25 is maintained at a constant temperature of 200 ° C. or less, and ammonia gas is introduced into the reactor 25 through the ammonia gas introduction pipe 28. The amount of ammonia gas introduced is determined twice or more to neutralize the anhydrous sulfuric acid SO 3 of the planned value. In the reactor 25, anhydrous sulfuric acid SO 3 reacts with the ammonia gas NH 3 to produce ammonium sulfate (NH 4 ) 2 SO 4 . Ammonium sulfate and unreacted ammonia gas are fed to the ammonia gas analyzer 26, and the concentration of unreacted ammonia gas is measured in the ammonia gas analyzer 26.
[0020]
The ammonia gas analysis in the ammonia gas analyzer 26 is performed by, for example, an infrared absorption method.
[0021]
The ammonia gas analyzer 26 has a measurement chamber filled with the gas after reaction, and an infrared laser beam 32 for measurement is emitted so as to cross the measurement chamber (see FIG. 2A). The infrared laser beam 32 that has crossed the chamber is received by a light amount detector (not shown). The ammonia gas as seen in FIG. 2 (B), to absorb infrared light of a specific wavelength, the concentration of ammonia gas by measuring the received light amount I m of the infrared light of the specific wavelength, if words Kaere The consumption amount of ammonia gas can be detected. The ammonia gas concentration C can be determined from the received light amount Im and the amount of light I 0 of the incident infrared laser light 32 by Lambert's basic equation (Equation 1).
[0022]
[Expression 1]
l n (I 0 / I m ) = αCL
α: Infrared absorption coefficient of ammonia gas L: Distance of infrared laser beam passing through measurement chamber C: Ammonia gas concentration
The ammonia gas concentration C detected by the ammonia gas analyzer 26 is input to the control unit 31. The control unit 31 obtains the consumption amount of ammonia gas supplied from the ammonia gas introduction pipe 28 from the ammonia gas concentration C, and calculates the concentration or amount of sulfuric anhydride in the exhaust gas corresponding to the consumption amount of the ammonia gas. . Further, the calculated amount of neutralizing agent necessary to neutralize the anhydrous sulfuric acid in the exhaust gas is calculated, and the flow rate control of the flow rate control valve 23 is performed based on the calculation result, which is necessary for neutralizing the anhydrous sulfuric acid. An appropriate amount of neutralizing agent is introduced into the duct 5 through the neutralizing agent supply nozzle 21. Examples of the neutralizing agent include ammonia gas NH 3 and calcium carbide CaCO 3 .
[0024]
Thus, exhaust gas is continuously extracted from the sampling nozzle 24, and a fixed amount of ammonia gas is continuously supplied from the ammonia gas introduction pipe 28 to the reactor 25, thereby continuously increasing the amount of sulfuric anhydride in the exhaust gas. Therefore, it is possible to continuously control the input amount of the neutralizing agent, and to always neutralize sulfuric anhydride in an optimal state.
[0025]
【The invention's effect】
As described above, according to the present invention, since the concentration and amount of sulfuric anhydride in exhaust gas can be measured continuously in substantially real time, it can be used as data for determining the amount of neutralizing agent input. The excellent effect of enabling continuous control to an appropriate amount is exhibited.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram showing an outline of an apparatus for measuring anhydrous sulfuric acid in exhaust gas according to an embodiment of the present invention.
FIGS. 2A and 2B are explanatory views of operations in the embodiment of the present invention. FIG.
FIG. 3 is an overall configuration diagram of a flue gas treatment system equipped with an apparatus for measuring sulfuric anhydride in exhaust gas.
FIG. 4 is an explanatory view of a conventional sulfuric acid anhydride measurement apparatus in exhaust gas.
[Explanation of symbols]
5 Duct 23 Flow control valve 24 Sampling nozzle 25 Reactor 26 Ammonia gas analyzer 29 Flow control valve 30 Flow meter 31 Control unit

Claims (4)

抽出した排ガスに定量のアンモニアガスを反応させ、未反応アンモニアガスを検出して排ガス中の無水硫酸の濃度を検出することを特徴とする排ガス中の無水硫酸測定方法。A method for measuring anhydrous sulfuric acid in exhaust gas, comprising reacting a certain amount of ammonia gas with the extracted exhaust gas, detecting unreacted ammonia gas, and detecting the concentration of anhydrous sulfuric acid in the exhaust gas. 排ガスの一部を連続的に抽出し、該抽出した排ガスに定流量のアンモニアガスを連続的に供給し、反応後のガスに対し赤外線吸収法によりアンモニアガスの濃度を測定する請求項1の排ガス中の無水硫酸測定方法。The exhaust gas according to claim 1, wherein a part of the exhaust gas is continuously extracted, ammonia gas at a constant flow rate is continuously supplied to the extracted exhaust gas, and the concentration of ammonia gas is measured with respect to the reacted gas by an infrared absorption method. Method for measuring sulfuric anhydride. 排ガスの一部を抽出する排ガス抽出手段と、アンモニアガスを定流量供給するアンモニアガス供給手段と、前記排ガス抽出手段からの抽出排ガスとアンモニアガス供給手段からのアンモニアガスを反応させる反応器と、該反応器から送出されるガス中の未反応アンモニアガスに対し赤外線吸収法によりアンモニアガスの濃度を測定するアンモニアガス分析器と、未反応アンモニアガス濃度より排ガス中の無水硫酸を演算する演算部とを具備したことを特徴とする排ガス中の無水硫酸測定装置。An exhaust gas extraction means for extracting a part of the exhaust gas, an ammonia gas supply means for supplying ammonia gas at a constant flow rate, a reactor for reacting the extracted exhaust gas from the exhaust gas extraction means and the ammonia gas from the ammonia gas supply means, An ammonia gas analyzer that measures the concentration of ammonia gas by the infrared absorption method for unreacted ammonia gas in the gas sent from the reactor, and a calculation unit that calculates sulfuric anhydride in the exhaust gas from the unreacted ammonia gas concentration An apparatus for measuring sulfuric anhydride in exhaust gas, comprising: 排ガスの一部を抽出する排ガス抽出手段と、アンモニアガスを定流量供給するアンモニアガス供給手段と、前記排ガス抽出手段からの抽出排ガスとアンモニアガス供給手段からのアンモニアガスを反応させる反応器と、該反応器から送出されるガス中の未反応アンモニアガスを赤外線吸収法によりアンモニアガスの濃度を測定するアンモニアガス分析器と、未反応アンモニアガス濃度より排ガス中の無水硫酸を演算する演算部と、排ガス中に無水硫酸用中和剤を投入する中和剤投入手段とを具備し、前記演算部からの演算結果に基づき前記中和剤投入手段からの中和剤投入量を制御することを特徴とする排ガス中の無水硫酸中和装置。An exhaust gas extraction means for extracting a part of the exhaust gas, an ammonia gas supply means for supplying ammonia gas at a constant flow rate, a reactor for reacting the extracted exhaust gas from the exhaust gas extraction means and the ammonia gas from the ammonia gas supply means, An ammonia gas analyzer that measures the concentration of ammonia gas in the gas delivered from the reactor by infrared absorption, an arithmetic unit that calculates sulfuric anhydride in the exhaust gas from the unreacted ammonia gas concentration, and an exhaust gas A neutralizing agent charging means for charging the neutralizing agent for sulfuric anhydride therein, and controlling the amount of neutralizing agent supplied from the neutralizing agent charging means based on the calculation result from the calculation unit. An anhydrous sulfuric acid neutralizer in exhaust gas.
JP11427698A 1998-04-09 1998-04-09 Method and apparatus for measuring sulfuric anhydride in exhaust gas and sulfuric acid neutralizer Expired - Fee Related JP3817896B2 (en)

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