JP2022059338A - Catalyst regeneration device and catalyst regeneration confirmation method - Google Patents

Catalyst regeneration device and catalyst regeneration confirmation method Download PDF

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JP2022059338A
JP2022059338A JP2020167016A JP2020167016A JP2022059338A JP 2022059338 A JP2022059338 A JP 2022059338A JP 2020167016 A JP2020167016 A JP 2020167016A JP 2020167016 A JP2020167016 A JP 2020167016A JP 2022059338 A JP2022059338 A JP 2022059338A
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regenerated air
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absorption
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catalyst regeneration
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全一 鎌田
Zenichi Kamata
譲 大山
Yuzuru Oyama
昌明 倉田
Masaaki Kurata
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Takuma Co Ltd
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Abstract

To provide a catalyst regeneration device which measures pH of an absorbent which is caused to absorb catalyst regeneration air, thereby enabling confirmation of completion of regeneration, and a catalyst regeneration completion confirmation method.SOLUTION: A catalyst regeneration device comprises: a catalyst reaction tower 1 in which a flue gas is introduced to occur catalytic reaction; a heater 2 for catalyst regeneration which is used for warming and regenerating a catalyst accumulated in the catalyst reaction tower 1; a regenerated air circulation line L1 which is derived from the catalyst reaction tower 1, and is returned to the catalyst reaction tower 1 via the heater 2 for catalyst regeneration; an air blower 3 for circulation which is provided on the regenerated air circulation line L1; a regenerated air absorption part 5 which is provided on a downstream side of the air blower 3 for circulation on the regenerated air circulation line L1; and a pH measurement part 6 which measures pH of an absorbent in which regenerated air has been absorbed at the regenerated air absorption part 5.SELECTED DRAWING: Figure 2

Description

本発明は、触媒再生装置および触媒再生確認方法に関する。 The present invention relates to a catalyst regeneration device and a catalyst regeneration confirmation method.

触媒の被毒物質である硫酸アンモニウム、硫酸水素アンモニウムを加熱分解した際にＳＯｘとＮＨ３が発生する。ＮＨ３の一部は、触媒で酸化されてＮＯｘとなり、触媒上で分解除去される。ＳＯｘの濃度低下をもって再生完了と判断している。
その確認方法として、（１）ＳＯｘ濃度をＳＯ２連続分析計で測定する、（２）手動分析でＳＯｘ濃度をバッチ測定する、（３）従来のプラントの実績をもとに再生時間を予め設定する。 SOx and NH 3 are generated when ammonium sulfate and ammonium hydrogen sulfate, which are toxic substances of the catalyst, are thermally decomposed. A part of NH 3 is oxidized by the catalyst to NOx, which is decomposed and removed on the catalyst. It is judged that the reproduction is completed when the concentration of SOx decreases.
As the confirmation method, (1) SOx concentration is measured with SO2 continuous analyzer, ( 2 ) SOx concentration is measured in batch by manual analysis, and (3) Regeneration time is set in advance based on the results of the conventional plant. do.

特許文献１または２は、再生時間を予め設定して運転しており、再生時間の完了を判断する方法については開示していない。 Patent Document 1 or 2 does not disclose a method of determining the completion of the reproduction time because the reproduction time is set in advance and the operation is performed.

特開平１１－２５３７５４号公報Japanese Unexamined Patent Publication No. 11-253754 特開２０１７－２１５０８３号公報Japanese Unexamined Patent Publication No. 2017-215083

しかし上記（１）から（３）に対応して以下の課題がある。
（１Ａ）発生したＳＯ２は触媒で酸化されてＳＯ３となる。ＳＯ３は、ＳＯ２連続分析計では測定できず、ＳＯ３濃度の低下については確認することができない。
（２Ａ）再生空気を吸収させた吸収液を、現場でなく分析機関などで、イオンクロマトグラフを用いてＳＯｘ濃度を分析する。もしくは、現地で中和滴定によりＳＯｘ濃度を分析する方法もあるが、いずれも専門の分析業者による作業が数日にわたって必要となる。
（３Ａ）プラントごとに運転条件が異なり、また同じプラントでもごみ質は変動するため、実績ベースで再生時間を決定すると、触媒の再生が不十分となる可能性がある。また、再生時間に十分余裕をみる方法もあるが、休炉時間を長く設定する必要が生じ、かつ過剰に熱量を加えることはＬＣＣ（ライフサイクルコスト）の観点から避けるべきである。 However, there are the following problems corresponding to the above (1) to (3).
(1A) The generated SO 2 is oxidized by a catalyst to become SO 3 . SO 3 cannot be measured by the SO 2 continuous analyzer, and the decrease in SO 3 concentration cannot be confirmed.
(2A) The SOx concentration of the absorbed liquid having absorbed the regenerated air is analyzed by using an ion chromatograph not at the site but at an analysis institution or the like. Alternatively, there is a method of analyzing the SOx concentration by neutralization titration on site, but all of them require work by a specialized analyst for several days.
(3A) Since the operating conditions differ from plant to plant and the quality of waste varies even in the same plant, if the regeneration time is determined based on actual results, the regeneration of the catalyst may be insufficient. In addition, although there is a method of allowing a sufficient margin for the regeneration time, it is necessary to set a long shutdown time, and adding an excessive amount of heat should be avoided from the viewpoint of LCC (life cycle cost).

本発明は、触媒再生空気を吸収させた吸収液のｐＨを測定することで、再生完了の確認を可能とする触媒再生装置および触媒再生完了確認方法を提供することを目的とする。 It is an object of the present invention to provide a catalyst regeneration apparatus and a catalyst regeneration completion confirmation method capable of confirming the completion of regeneration by measuring the pH of the absorbent liquid that has absorbed the catalyst regeneration air.

本発明の触媒再生装置は、
（燃焼炉から排出された）燃焼排ガスが導入され、触媒反応を起こさせる触媒反応塔（１）と、
前記触媒反応塔（１）に貯留されている触媒の加温再生に使用される触媒再生用ヒータ（２）と、
前記触媒反応塔（１）から導出され、前記触媒再生用ヒータ（２）を介して、前記触媒反応塔（１）へ戻す再生空気循環ライン（Ｌ１）と、
前記再生空気循環ライン（Ｌ１）に設けられる循環用送風機（３）と、
前記再生空気循環ライン（Ｌ１）の前記循環用送風機（３）の下流側（かつ触媒再生用ヒータ（２）の上流側）に設けられる再生空気吸収部（５）と、
前記再生空気吸収部（５）で、再生空気が吸収された吸収液のｐＨを測定するｐＨ測定部（６）と、
を備える。 The catalyst regeneration device of the present invention
The catalytic reaction tower (1), in which the combustion exhaust gas (exhausted from the combustion furnace) is introduced and causes a catalytic reaction,
A catalyst regeneration heater (2) used for heating regeneration of the catalyst stored in the catalyst reaction tower (1), and a catalyst regeneration heater (2).
A regenerated air circulation line (L1) derived from the catalytic reaction tower (1) and returned to the catalytic reaction tower (1) via the catalyst regeneration heater (2).
The circulation blower (3) provided in the regenerated air circulation line (L1) and
A regenerated air absorbing unit (5) provided on the downstream side of the circulating blower (3) of the regenerated air circulation line (L1) (and on the upstream side of the catalyst regeneration heater (2)).
In the regenerated air absorbing unit (5), a pH measuring unit (6) for measuring the pH of the absorbing liquid in which the regenerated air is absorbed, and a pH measuring unit (6).
To prepare for.

前記再生空気吸収部（５）は、再生空気循環ライン（Ｌ１）の循環用送風機（３）より下流側から分岐された分岐ライン（Ｌ１１）に設けられ、当該分岐ライン（Ｌ１１）が再生空気循環ライン（Ｌ１）の循環用送風機（３）より上流側で合流してもよい。分岐ライン（Ｌ１１）には、前記再生空気吸収部（５）の上流および／または下流に弁（Ｖ２、Ｖ３、例えば、ＯＮ／ＯＦＦ仕切弁、流量制御弁など）が設けられていてもよい。なお、再生空気吸収部（５）に、再生空気を導入および／または導出するための弁が別に設けられていてもよい。 The regenerated air absorbing unit (5) is provided in a branch line (L11) branched from the downstream side of the circulation blower (3) of the regenerated air circulation line (L1), and the branch line (L11) circulates the regenerated air. It may join on the upstream side of the circulation blower (3) of the line (L1). The branch line (L11) may be provided with valves (V2, V3, for example, ON / OFF sluice valves, flow rate control valves, etc.) upstream and / or downstream of the regenerated air absorption unit (5). The regenerated air absorbing unit (5) may be separately provided with a valve for introducing and / or deriving the regenerated air.

前記再生空気循環ライン（Ｌ１）は、前記触媒反応塔（１）の導出側（ライン入口側）および／または戻し側（ライン出口側）に弁（Ｖ１、例えば、ＯＮ／ＯＦＦ仕切弁、流量制御弁など）が設けられていてもよい。
前記再生空気循環ライン（Ｌ１）の循環用送風機（３）より下流側から分岐され、集塵設備へ導く、排出分岐ライン（Ｌ１２）が設けられていてもよい。排出分岐ライン（Ｌ１２）には弁（Ｖ８、例えば、ＯＮ／ＯＦＦ仕切弁、流量制御弁など）が設けられていてもよい。 The regenerated air circulation line (L1) has a valve (V1, for example, ON / OFF sluice valve, flow rate control) on the lead-out side (line inlet side) and / or return side (line outlet side) of the catalytic reaction tower (1). A valve or the like) may be provided.
An discharge branch line (L12) that branches from the downstream side of the circulation blower (3) of the regenerated air circulation line (L1) and leads to the dust collecting facility may be provided. The discharge branch line (L12) may be provided with a valve (V8, for example, an ON / OFF sluice valve, a flow rate control valve, etc.).

前記再生空気吸収部（５）は、
吸収液を貯留する吸収瓶（５１）と、
前記分岐ライン（Ｌ１１）から前記再生空気を前記吸収瓶（５１）の吸収液の液相へ送り込む送込ライン（Ｌ５１）と、
前記吸収瓶（５１）の気相から（吸収処理済みの）再生空気を導出し、前記分岐ライン（Ｌ１１）へ送る、導出ライン（Ｌ５２）と、
前記導出ライン（Ｌ５２）に設けられる、流量制御弁（５２）（流量計およびその結果に応じて流量を調整する流量調節弁）と、
前記吸収瓶（５１）から、廃液が導出される廃液導出ライン（Ｌ５３）（廃液導出ラインに廃液排出弁（Ｖ５３）が設けられ）と、
前記廃液導出ライン（Ｌ５３）を介して送られる廃液を貯留する廃液タンク（５３）と、
前記吸収瓶（５１）より上流側の前記送込ライン（Ｌ５１）に設けられる三方弁（５５）と、
前記三方弁（５５）へ導かれ、前記吸収瓶（５１）へ送られる吸収液を貯留する吸収液タンク（５６）と、
前記吸収液タンク（５６）から前記三方弁（５５）へ至る吸収液補充ライン（Ｌ５４）と、
前記吸収液補充ライン（Ｌ５４）に設けられ、吸収液を液送する送液ポンプ（５７）と、
を、一部または複数を有していてもよい。 The regenerated air absorbing unit (5) is
An absorption bottle (51) for storing the absorption liquid and
A delivery line (L51) that sends the regenerated air from the branch line (L11) to the liquid phase of the absorption liquid of the absorption bottle (51).
A derivation line (L52) that derives (absorbed) regenerated air from the gas phase of the absorption bottle (51) and sends it to the branch line (L11).
A flow rate control valve (52) (flow meter and a flow rate control valve that adjusts the flow rate according to the result) provided in the lead-out line (L52).
A waste liquid lead-out line (L53) from which the waste liquid is drawn out from the absorption bottle (51) (a waste liquid discharge valve (V53) is provided in the waste liquid lead-out line), and
A waste liquid tank (53) for storing waste liquid sent via the waste liquid lead-out line (L53), and a waste liquid tank (53).
A three-way valve (55) provided in the delivery line (L51) on the upstream side of the absorption bottle (51), and
An absorbent tank (56) for storing the absorbent liquid guided to the three-way valve (55) and sent to the absorbent bottle (51).
The absorbent liquid replenishment line (L54) from the absorbent liquid tank (56) to the three-way valve (55),
A liquid feeding pump (57) provided in the absorption liquid replenishment line (L54) to feed the absorption liquid, and a liquid feeding pump (57).
May have a part or a plurality.

前記再生空気吸収部（５）は、
再生中（もしくは、再生開始から所定期間（１０から６０分、１Ｌ／ｍｉｎ流速）の間、タイマー運転する）は、分岐ライン（Ｌ１１）の弁（Ｖ２、Ｖ３）を開け（および／または三方弁を切り替え）、再生空気を前記吸収瓶（５１）へ送り、吸収処理済みの再生空気を分岐ライン（Ｌ１１）から再生空気循環ライン（Ｌ１）へ戻すように、三方弁（５５）を切り替えおよび弁（分岐ラインＬ１１の弁）を制御する、吸収処理モードと、
吸収瓶（５１）から廃液タンク（５３）へ廃液（吸収液の使用ずみ）を排出するように、廃液排出弁（Ｖ５３）を制御する廃液排出モードと、
廃液を排出した後で、吸収液を吸収瓶（５１）へ補充するように、三方弁（５５）の切り替えおよび送液ポンプ（５７）を制御する、吸収液補充モードと、
前記吸収処理モードの際の一部に重複して、または吸収処理モードの後で、ｐＨ測定部（６）で自動的（連続測定またはバッチ測定として）にｐＨ測定を行う、ｐＨ測定モードと、
を制御するモード制御部（５０１）を有していてもよい。 The regenerated air absorbing unit (5) is
During regeneration (or timer operation for a predetermined period (10 to 60 minutes, 1 L / min flow rate) from the start of regeneration), the valves (V2, V3) of the branch line (L11) are opened (and / or three-way valves). To switch the three-way valve (55) so that the regenerated air is sent to the absorption bottle (51) and the regenerated air that has been absorbed is returned from the branch line (L11) to the regenerated air circulation line (L1). The absorption processing mode that controls (the valve of the branch line L11),
A waste liquid discharge mode that controls the waste liquid discharge valve (V53) so that the waste liquid (used liquid) is discharged from the absorption bottle (51) to the waste liquid tank (53).
An absorption liquid replenishment mode that controls the switching of the three-way valve (55) and the liquid feed pump (57) so that the absorption liquid is replenished to the absorption bottle (51) after the waste liquid is discharged.
A pH measurement mode in which pH measurement is automatically performed (as continuous measurement or batch measurement) by the pH measuring unit (6), which overlaps with a part of the absorption treatment mode or after the absorption treatment mode.
May have a mode control unit (501) for controlling the above.

前記ｐＨ測定部（６）は、前記吸収瓶（５１）に取り付けられ、吸収瓶（５１）の液相のｐＨを直接測定してもよい。
前記吸収瓶（５１）は、着脱可能に設定されてもよい。かかる場合に、前記ｐＨ測定部（６）が、前記吸収瓶（５１）の開口部から測定プローブを挿入し液相のｐＨを、自動でまたは手動で測定してもよい。 The pH measuring unit (6) may be attached to the absorption bottle (51) and directly measure the pH of the liquid phase of the absorption bottle (51).
The absorption bottle (51) may be set to be removable. In such a case, the pH measuring unit (6) may insert a measuring probe through the opening of the absorption bottle (51) to automatically or manually measure the pH of the liquid phase.

他の発明の触媒再生確認方法は、
触媒反応塔（１）から導出された再生空気を、再生空気吸収部（５）で吸収液に吸収させ、再生空気が吸収された吸収液のｐＨを連続的または非連続的に測定するｐＨ測定ステップと、
前記ｐＨ測定ステップで測定されたｐＨ値が、所定範囲であれば、触媒再生が完了したと判断する判断ステップを含む。
触媒再生完了の判断は、例えば、ｐＨ値が６以上、ｐＨ値の変動がなくなった（安定した）（時間単位当たりの変化（傾き）が閾値以下の）場合に、再生完了したと判断してもよい。
吸収液は、例えば、純水、過酸化水素水であってもよい。
吸収瓶は、１つまたは複数であってもよい。 The catalyst regeneration confirmation method of another invention is
The regenerated air derived from the catalytic reaction tower (1) is absorbed by the regenerating air absorbing unit (5) in the absorbing liquid, and the pH of the absorbing liquid in which the regenerated air is absorbed is continuously or discontinuously measured. Steps and
If the pH value measured in the pH measurement step is within a predetermined range, it includes a determination step of determining that the catalyst regeneration is completed.
The determination of catalyst regeneration completion is determined, for example, when the pH value is 6 or more and the pH value does not fluctuate (stable) (the change (slope) per hour unit is equal to or less than the threshold value). May be good.
The absorption liquid may be, for example, pure water or hydrogen peroxide solution.
The number of absorption bottles may be one or more.

［効果］
ｐＨ値を指標に触媒再生空気中のＳＯｘ濃度を監視することで、ＳＯ２連続分析計で測定監視するよりも正確に触媒再生完了のタイミングを把握することができる。
専門の分析者に現地での分析作業が不要となる。
外部分析機関へ頼ることなく、現地で簡単に分析を行える。
触媒再生完了を確認できるため、触媒再生処理時間に余裕を持たせる必要がなくなり、触媒再生処理にかかる時間を短縮できるので休炉期間の短縮ができ、また、触媒再生用ヒータの電力使用量の削減ができる。 [effect]
By monitoring the SOx concentration in the catalyst regeneration air using the pH value as an index, it is possible to grasp the timing of the completion of the catalyst regeneration more accurately than by measuring and monitoring with the SO2 continuous analyzer.
It eliminates the need for on-site analysis work by specialized analysts.
You can easily perform analysis locally without relying on an external analysis organization.
Since the completion of catalyst regeneration can be confirmed, it is not necessary to allow a margin in the catalyst regeneration processing time, the time required for the catalyst regeneration processing can be shortened, the furnace shutdown period can be shortened, and the power consumption of the catalyst regeneration heater can be shortened. Can be reduced.

触媒再生装置の一例を示す図である。It is a figure which shows an example of a catalyst regeneration apparatus. 自動化された再生空気吸収部およびｐＨ測定部の一例である。It is an example of an automated regenerated air absorbing unit and a pH measuring unit. 手動における再生空気吸収部およびｐＨ測定部の一例である。This is an example of a manually regenerated air absorbing unit and a pH measuring unit.

（実施形態１）
図１に、実施形態１の触媒再生装置１００の例を示す。
触媒再生装置１００は、触媒反応塔１と、触媒再生用ヒータ２と、循環用送風機３と、再生空気吸収部５と、ｐＨ測定部６を備える。
触媒反応塔１は、燃焼炉から排出された燃焼排ガスが導入され、触媒反応を起こさせる反応塔である。触媒反応塔１に配置されている触媒としては、例えば、脱硝触媒などが挙げられる。
触媒再生用ヒータ２は、触媒反応塔１に貯留されている触媒の加温再生に使用される。再生空気循環ラインＬ１は、触媒反応塔１から導出され、触媒再生用ヒータ２を介して、触媒反応塔１へ戻る配管である。再生空気循環ラインＬ１には、循環用送風機３が設けられる。
再生空気循環ラインＬ１は、触媒反応塔１の導出側（ライン入口側）に弁Ｖ１が設けられる。弁Ｖ１は、ＯＮ／ＯＦＦ仕切弁である。
また、再生空気循環ラインＬ１の循環用送風機３より下流側から分岐され、集塵設備（不図示）へ導く、排出分岐ラインＬ１２が設けられる。排出分岐ラインＬ１２には弁Ｖ８が設けられる。弁Ｖ８は、ＯＮ／ＯＦＦ仕切弁である。 (Embodiment 1)
FIG. 1 shows an example of the catalyst regeneration device 100 of the first embodiment.
The catalyst regeneration device 100 includes a catalyst reaction tower 1, a catalyst regeneration heater 2, a circulation blower 3, a regeneration air absorption unit 5, and a pH measurement unit 6.
The catalytic reaction tower 1 is a reaction tower in which combustion exhaust gas discharged from a combustion furnace is introduced to cause a catalytic reaction. Examples of the catalyst arranged in the catalyst reaction column 1 include a denitration catalyst and the like.
The catalyst regeneration heater 2 is used for heating regeneration of the catalyst stored in the catalyst reaction tower 1. The regenerated air circulation line L1 is a pipe that is derived from the catalytic reaction tower 1 and returns to the catalytic reaction tower 1 via the catalyst regeneration heater 2. The regenerated air circulation line L1 is provided with a circulation blower 3.
The regenerated air circulation line L1 is provided with a valve V1 on the lead-out side (line inlet side) of the catalytic reaction tower 1. The valve V1 is an ON / OFF sluice valve.
Further, a discharge branch line L12 is provided, which is branched from the downstream side of the circulation blower 3 of the regenerated air circulation line L1 and leads to a dust collector (not shown). A valve V8 is provided on the discharge branch line L12. The valve V8 is an ON / OFF sluice valve.

再生空気吸収部５は、再生空気循環ラインＬ１の循環用送風機３より下流側から分岐された分岐ラインＬ１１に設けられる。分岐ラインＬ１１は、再生空気循環ラインＬ１の循環用送風機３より上流側で合流する。
分岐ラインＬ１１には、再生空気吸収部５の上流および下流に弁Ｖ２、弁Ｖ３が設けられる。弁Ｖ２、Ｖ３は、ＯＮ／ＯＦＦ仕切弁である。ｐＨ測定部６は、再生空気吸収部５で再生空気が吸収された吸収液のｐＨを連続的にまたは所定のタイミングで測定する。本実施形態において、ｐＨ測定部６は、吸収瓶５１に取り付けられ、吸収瓶５１の液相のｐＨを直接測定する。 The regenerated air absorbing unit 5 is provided on the branch line L11 branched from the downstream side of the circulation blower 3 of the regenerated air circulation line L1. The branch line L11 joins on the upstream side of the circulation blower 3 of the regenerated air circulation line L1.
The branch line L11 is provided with valves V2 and valves V3 upstream and downstream of the regenerated air absorbing unit 5. The valves V2 and V3 are ON / OFF sluice valves. The pH measuring unit 6 measures the pH of the absorbing liquid in which the regenerated air is absorbed by the regenerated air absorbing unit 5 continuously or at a predetermined timing. In the present embodiment, the pH measuring unit 6 is attached to the absorption bottle 51 and directly measures the pH of the liquid phase of the absorption bottle 51.

図２に、自動化された再生空気吸収部５およびｐＨ測定部６を示す。
再生空気吸収部５は、吸収液を貯留する吸収瓶５１と、分岐ラインＬ１１から再生空気を吸収瓶５１の吸収液の液相へ送り込む送込ラインＬ５１と、吸収瓶５１の気相から吸収処理済みの再生空気を導出し、分岐ラインＬ１１へ送る、導出ラインＬ５２と、導出ラインＬ５２に設けられる、流量制御弁５２を備える。流量制御弁５２は、流量計およびその結果に応じて流量を調整する流量調節弁で構成される。
また、再生空気吸収部５は、吸収瓶５１から、廃液が導出される廃液導出ラインＬ５３と、その廃液導出ラインＬ５３に設けられる廃液排出弁Ｖ５３と、廃液を貯留する廃液タンク５３を備える。
また、送込ラインＬ５１に三方弁５５が設けられる。
また、再生空気吸収部５は、三方弁５５へ導かれ、吸収瓶５１へ送られる吸収液を貯留する吸収液タンク５６と、吸収液タンク５６から三方弁５５へ至る吸収液補充ラインＬ５４と、吸収液補充ラインＬ５４に設けられ、吸収液を液送する送液ポンプ５７を備える。 FIG. 2 shows an automated regenerated air absorbing unit 5 and a pH measuring unit 6.
The regenerated air absorbing unit 5 absorbs from the absorption bottle 51 that stores the absorption liquid, the delivery line L51 that sends the regenerated air from the branch line L11 to the liquid phase of the absorption liquid of the absorption bottle 51, and the gas phase of the absorption bottle 51. It includes a lead-out line L52 that draws out the regenerated air and sends it to the branch line L11, and a flow control valve 52 provided in the lead-out line L52. The flow rate control valve 52 includes a flow meter and a flow rate control valve that adjusts the flow rate according to the result.
Further, the regenerated air absorbing unit 5 includes a waste liquid lead-out line L53 from which the waste liquid is led out from the absorption bottle 51, a waste liquid discharge valve V53 provided in the waste liquid lead-out line L53, and a waste liquid tank 53 for storing the waste liquid.
Further, a three-way valve 55 is provided on the delivery line L51.
Further, the regenerated air absorption unit 5 includes an absorption liquid tank 56 that is guided to the three-way valve 55 and stores the absorption liquid that is sent to the absorption bottle 51, and an absorption liquid replenishment line L54 that extends from the absorption liquid tank 56 to the three-way valve 55. The absorption liquid replenishment line L54 is provided with a liquid feeding pump 57 for feeding the absorption liquid.

本実施形態において、分岐ラインＬ１１から吸収瓶５１までの距離（または三方弁５５から吸収瓶５１までの送込ラインＬ５１の距離）は、極力短く設定することが好ましく、例えば、２００ｍｍ以内、１００ｍｍ以内である。送込ラインＬ５１に、ＳＯｘ（特にＳＯ３）が極力残留しないようにしたいからである。 In the present embodiment, the distance from the branch line L11 to the absorption bottle 51 (or the distance of the delivery line L51 from the three-way valve 55 to the absorption bottle 51) is preferably set as short as possible, for example, within 200 mm and within 100 mm. Is. This is because we want to prevent SOx (particularly SO 3 ) from remaining on the delivery line L51 as much as possible.

また、再生空気吸収部５は、モード制御部５０１を備える。
モード制御部５０１は、再生中（もしくは、再生開始から所定期間（１０から６０分、１Ｌ／ｍｉｎ流速）の間のタイマー運転中）は、分岐ラインＬ１１の弁Ｖ２を開けおよび三方弁５５を吸収瓶５１へ導入するライン切り替え、再生空気を吸収瓶５１へ送り、吸収処理済みの再生空気を分岐ラインＬ１１から再生空気循環ラインＬ１へ戻すように、三方弁５５を切り替えおよび弁Ｖ２、Ｖ３（分岐ラインに設けられる弁）を制御する、吸収処理モードと、
吸収瓶５１へ、廃液タンク５３へ廃液（吸収液の使用ずみ）を排出するように、廃液排出弁Ｖ５３を制御する廃液排出モードと、
廃液を排出した後で、吸収液を吸収瓶５１へ補充するように、三方弁５５の切り替えおよび送液ポンプ５７を制御する、吸収液補充モードと、
吸収処理モードの際の一部に重複して、または吸収処理モードの後で、ｐＨ測定部６でバッチ測定としてｐＨ測定を行う、ｐＨ測定モードと、をそれぞれ切り替えて制御する。
モード制御部５０１は、バッチ測定としてのｐＨ測定後に、吸収瓶５１から吸収液を廃液タンク５３へ送り、その後に、廃液排出弁Ｖ５３を閉じる（または廃液排出弁を開けたままとしてもよい）。三方弁５５を切り替え、送液ポンプ５７を駆動して吸収液タンク５６から吸収液を吸収瓶５１へ送り、送込ラインＬ５１および吸収瓶５１の残留ＳＯｘを洗浄する。一定量の吸収液で洗浄した後、廃液排出弁Ｖ５３を開けて、洗浄した液を廃液タンク５３へ排出する。その後に、廃液排出弁Ｖ５３を閉じ、吸収瓶５１に吸収液を所定量おくる。送液ポンプ５７を停止し、三方弁５５を切り替える。次の触媒再生完了を判断するまで待機する。 Further, the regenerated air absorbing unit 5 includes a mode control unit 501.
The mode control unit 501 opens the valve V2 of the branch line L11 and absorbs the three-way valve 55 during regeneration (or during timer operation during a predetermined period (10 to 60 minutes, 1 L / min flow rate) from the start of regeneration). The three-way valve 55 is switched and valves V2 and V3 (branch) so that the line to be introduced into the bottle 51 is switched, the regenerated air is sent to the absorption bottle 51, and the regenerated air that has been absorbed is returned from the branch line L11 to the regenerated air circulation line L1. Absorption processing mode that controls the valve (valve provided on the line),
A waste liquid discharge mode that controls the waste liquid discharge valve V53 so that the waste liquid (used up of the absorbed liquid) is discharged to the absorption bottle 51 and the waste liquid tank 53.
An absorption liquid replenishment mode that controls the switching of the three-way valve 55 and the liquid feed pump 57 so that the absorption liquid is replenished to the absorption bottle 51 after the waste liquid is discharged.
The pH measurement mode is controlled by switching between the pH measurement mode and the pH measurement mode in which the pH measurement unit 6 performs the pH measurement as a batch measurement, which overlaps with a part of the absorption treatment mode or after the absorption treatment mode.
After the pH measurement as a batch measurement, the mode control unit 501 sends the absorbed liquid from the absorption bottle 51 to the waste liquid tank 53, and then closes the waste liquid discharge valve V53 (or may leave the waste liquid discharge valve open). The three-way valve 55 is switched, and the liquid feeding pump 57 is driven to send the absorbing liquid from the absorbing liquid tank 56 to the absorbing bottle 51 to clean the residual SOx of the feeding line L51 and the absorbing bottle 51. After cleaning with a certain amount of absorbing liquid, the waste liquid discharge valve V53 is opened and the washed liquid is discharged to the waste liquid tank 53. After that, the waste liquid discharge valve V53 is closed, and a predetermined amount of the absorbing liquid is placed in the absorbing bottle 51. The liquid feed pump 57 is stopped and the three-way valve 55 is switched. Wait until it is determined that the next catalyst regeneration is completed.

再生空気吸収部５は、ｐＨ測定部６で測定されたｐＨ値が、所定範囲内であれば、触媒再生が完了したと判断する判断部７を有していてもよい。判断部７と共に、ｐＨ測定値がモニターに表示され、オペレータが再生完了を判断してもよい。かかる場合、判断部７はオペレータの判断の支援として機能していてもよい。
判断部７は、例えば、ｐＨ値が６以上、ｐＨ値の変動がなくなった（安定した）（時間単位当たりの変化（傾き）が閾値以下の）場合に、再生完了したと判断してもよい。 The regenerated air absorbing unit 5 may have a determination unit 7 for determining that the catalyst regeneration is completed if the pH value measured by the pH measuring unit 6 is within a predetermined range. The pH measurement value may be displayed on the monitor together with the determination unit 7, and the operator may determine that the reproduction is completed. In such a case, the determination unit 7 may function as a support for the operator's determination.
The determination unit 7 may determine that the reproduction is completed, for example, when the pH value is 6 or more and the fluctuation of the pH value disappears (stable) (the change (slope) per time unit is equal to or less than the threshold value). ..

再生空気吸収部５は、触媒再生の開始、停止を制御する制御部１０を有していてもよい。制御部１０は、触媒再生開始の際に、循環用送風機３および触媒再生用ヒータ２を駆動し、再生空気循環ラインＬ１の弁Ｖ１を開ける。また、制御部１０は、触媒再生開始の際に、触媒反応塔１の排ガス上流側および排ガス下流側のダンパーを閉じる。
判断部７で再生完了が判断された場合に、あるいはオペレータの判断などの手動介入の場合に、制御部１０は、循環用送風機３および触媒再生用ヒータ２を停止し、再生空気循環ラインＬ１の弁Ｖ１を閉じる。
モード制御部５０１、制御部１０および判断部７は、メモリ、プロセッサー、ソフトウエアプログラムを有する情報処理装置（例えば、コンピュータ、サーバ）や、専用回路、ファームウエアなどで構成してもよい。情報処理装置は、オンプレミスまたはクラウドのいずれか一方、あるいは両方の組み合わせであってもよい。 The regenerated air absorbing unit 5 may have a control unit 10 that controls the start and stop of catalyst regeneration. The control unit 10 drives the circulation blower 3 and the catalyst regeneration heater 2 at the start of catalyst regeneration, and opens the valve V1 of the regeneration air circulation line L1. Further, the control unit 10 closes the dampers on the exhaust gas upstream side and the exhaust gas downstream side of the catalyst reaction tower 1 when the catalyst regeneration is started.
When the determination unit 7 determines that the regeneration is completed, or in the case of manual intervention such as the operator's determination, the control unit 10 stops the circulation blower 3 and the catalyst regeneration heater 2, and the regeneration air circulation line L1. Close the valve V1.
The mode control unit 501, the control unit 10, and the determination unit 7 may be configured by an information processing device (for example, a computer, a server) having a memory, a processor, and a software program, a dedicated circuit, firmware, and the like. The information processing device may be either on-premises or cloud, or a combination of both.

（別実施形態）
図３に示す別実施形態では、手動でｐＨ測定を行う方法である。
再生空気吸収部５は、吸収液を貯留する吸収瓶５１と、分岐ラインＬ１１から再生空気を吸収瓶５１の吸収液の液相へ送り込む送込ラインＬ５１と、吸収瓶５１の気相から吸収処理済みの再生空気を導出し、分岐ラインＬ１１へ送る、導出ラインＬ５２と、導出ラインＬ５２に設けられる、流量制御弁５２を備える。
ｐＨ測定をする場合には、弁Ｖ２、Ｖ３を閉じて、分岐ラインＬ１１から吸収瓶５１を取り出し、吸収瓶５１の開口部から測定プローブを挿入し液相のｐＨを、ｐＨ測定部６で、手動で測定することができる。
手動測定中には、替わりの吸収液入りの吸収瓶を分岐ラインＬ１１にセットしていてもよい。 (Another embodiment)
Another embodiment shown in FIG. 3 is a method of manually measuring pH.
The regenerated air absorbing unit 5 absorbs from the absorption bottle 51 that stores the absorption liquid, the delivery line L51 that sends the regenerated air from the branch line L11 to the liquid phase of the absorption liquid of the absorption bottle 51, and the gas phase of the absorption bottle 51. It includes a lead-out line L52 that draws out the regenerated air and sends it to the branch line L11, and a flow control valve 52 provided in the lead-out line L52.
When measuring the pH, the valves V2 and V3 are closed, the absorption bottle 51 is taken out from the branch line L11, a measurement probe is inserted from the opening of the absorption bottle 51, and the pH of the liquid phase is measured by the pH measurement unit 6. It can be measured manually.
During the manual measurement, an absorption bottle containing an alternative absorption liquid may be set on the branch line L11.

（実施形態２）
触媒再生確認方法は、
触媒反応塔１から導出された再生空気を、再生空気吸収部５で吸収液に吸収させ、再生空気が吸収された吸収液のｐＨを連続的または非連続的に測定するｐＨ測定ステップと、
ｐＨ測定ステップで測定されたｐＨ値が、所定範囲であれば、触媒再生が完了したと判断する判断ステップを含む。
触媒再生完了の判断は、例えば、ｐＨ値が６以上、ｐＨ値の変動がなくなった（安定した）（時間単位当たりの変化（傾き）が閾値以下の）場合に、再生完了したと判断してもよい。 (Embodiment 2)
The catalyst regeneration confirmation method is
A pH measurement step in which the regenerated air derived from the catalytic reaction tower 1 is absorbed by the regenerating air absorbing unit 5 into the absorbing liquid, and the pH of the absorbing liquid in which the regenerated air is absorbed is continuously or discontinuously measured.
If the pH value measured in the pH measurement step is within a predetermined range, it includes a determination step of determining that the catalyst regeneration is completed.
The determination of catalyst regeneration completion is determined, for example, when the pH value is 6 or more and the pH value does not fluctuate (stable) (the change (slope) per hour unit is equal to or less than the threshold value). May be good.

１ 触媒反応塔
２ 触媒再生用ヒータ
３ 循環用送風機
５ 再生空気吸収部
６ ｐＨ測定部 1 Catalyst reaction tower 2 Catalyst regeneration heater 3 Circulation blower 5 Regeneration air absorption unit 6 pH measurement unit

Claims (5)

燃焼排ガスが導入され、触媒反応を起こさせる触媒反応塔と、
前記触媒反応塔に貯留されている触媒の加温再生に使用される触媒再生用ヒータと、
前記触媒反応塔から導出され、前記触媒再生用ヒータを介して、前記触媒反応塔へ戻す再生空気循環ラインと、
前記再生空気循環ラインに設けられる循環用送風機と、
前記再生空気循環ラインの前記循環用送風機の下流側に設けられる再生空気吸収部と、
前記再生空気吸収部で再生空気が吸収された吸収液のｐＨを測定するｐＨ測定部と、
を備える、触媒再生装置。 A catalytic reaction tower where combustion exhaust gas is introduced and causes a catalytic reaction,
A catalyst regeneration heater used for heating regeneration of the catalyst stored in the catalyst reaction tower, and a heater for catalyst regeneration.
A regenerated air circulation line derived from the catalytic reaction tower and returned to the catalytic reaction tower via the catalyst regeneration heater.
The circulation blower provided in the regenerated air circulation line and
A regenerated air absorbing unit provided on the downstream side of the circulating blower of the regenerated air circulation line,
A pH measuring unit for measuring the pH of the absorbent liquid in which the regenerated air was absorbed in the regenerated air absorbing unit, and a pH measuring unit.
A catalyst regeneration device. 前記再生空気循環ラインの前記循環用送風機より下流側から分岐され、前記循環用送風機より上流側で合流する分岐ラインを設け、
前記再生空気吸収部は、
吸収液を貯留する吸収瓶と、
前記分岐ラインから前記再生空気を前記吸収瓶の吸収液の液相へ送り込む送込ラインと、
前記吸収瓶の気相から再生空気を導出し、前記分岐ラインへ送る、導出ラインと、
前記導出ラインに設けられる、流量制御弁と、
備える、請求項１に記載の触媒再生装置。 A branch line is provided which is branched from the downstream side of the circulating blower of the regenerated air circulation line and merges on the upstream side of the circulating blower.
The regenerated air absorbing unit is
An absorbent bottle for storing the absorbent liquid and
A delivery line that sends the regenerated air from the branch line to the liquid phase of the absorption liquid in the absorption bottle.
A derivation line that derives regenerated air from the gas phase of the absorption bottle and sends it to the branch line.
The flow control valve provided in the lead-out line and
The catalyst regeneration device according to claim 1. 前記再生空気吸収部は、
前記吸収瓶から、廃液が導出される廃液導出ラインと、
前記廃液導出ラインを介して送られる廃液を貯留する廃液タンクと、
前記吸収瓶より上流側の前記送込ラインに設けられる三方弁と、
前記三方弁へ導かれ、前記吸収瓶へ送られる吸収液を貯留する吸収液タンクと、
前記吸収液タンクから前記三方弁へ至る吸収液補充ラインと、
前記吸収液補充ラインに設けられ、吸収液を液送する送液ポンプと、
をさらに備える、請求項２に記載の触媒再生装置。 The regenerated air absorbing unit is
A waste liquid derivation line from which the waste liquid is derived from the absorption bottle,
A waste liquid tank for storing the waste liquid sent via the waste liquid lead-out line, and
A three-way valve provided on the delivery line on the upstream side of the absorption bottle,
An absorbent tank that stores the absorbent liquid that is guided to the three-way valve and sent to the absorbent bottle.
The absorbent liquid replenishment line from the absorbent liquid tank to the three-way valve,
A liquid feed pump provided in the absorption liquid replenishment line to feed the absorption liquid,
The catalyst regeneration device according to claim 2, further comprising. 前記再生空気吸収部は、
再生中は、分岐ラインの弁を開け、再生空気を前記吸収瓶へ送り、吸収処理済みの再生空気を分岐ラインから再生空気循環ラインへ戻すように、三方弁を切り替えおよび分岐ラインの弁を制御する、吸収処理モードと、
吸収瓶から廃液タンクへ廃液を排出するように、廃液排出弁を制御する廃液排出モードと、
廃液を排出した後で、吸収液を吸収瓶へ補充するように、三方弁の切り替えおよび送液ポンプを制御する、吸収液補充モードと、
前記吸収処理モードの際の一部に重複して、または吸収処理モードの後で、ｐＨ測定部でｐＨ測定を行う、ｐＨ測定モードと、
を制御するモード制御部をさらに備える、請求項３に記載の触媒再生装置。 The regenerated air absorbing unit is
During regeneration, the valve of the branch line is opened, the regenerated air is sent to the absorption bottle, and the three-way valve is switched and the valve of the branch line is controlled so that the regenerated air that has been absorbed is returned from the branch line to the regenerated air circulation line. The absorption processing mode and
A waste liquid discharge mode that controls the waste liquid discharge valve so that the waste liquid is discharged from the absorption bottle to the waste liquid tank,
Absorption liquid replenishment mode, which controls the switching of the three-way valve and the liquid feed pump so that the absorption liquid is replenished to the absorption bottle after draining the waste liquid.
A pH measurement mode in which the pH is measured by the pH measuring unit after the absorption treatment mode or overlapping with a part of the absorption treatment mode.
The catalyst regeneration device according to claim 3, further comprising a mode control unit for controlling the above. 触媒反応塔から導出された再生空気を、再生空気吸収部で吸収液に吸収させ、再生空気が吸収された吸収液のｐＨを連続的または非連続的に測定するｐＨ測定ステップと、
前記ｐＨ測定ステップで測定されたｐＨ値が、所定範囲であれば、触媒再生が完了したと判断する判断ステップを含む、触媒再生確認方法。 A pH measurement step in which the regenerated air derived from the catalytic reaction tower is absorbed by the regenerating air absorption unit into the absorbing liquid, and the pH of the absorbing liquid in which the regenerated air is absorbed is continuously or discontinuously measured.
A catalyst regeneration confirmation method including a determination step of determining that catalyst regeneration is completed if the pH value measured in the pH measurement step is within a predetermined range.
JP2020167016A 2020-10-01 2020-10-01 Catalyst regeneration device and catalyst regeneration confirmation method Pending JP2022059338A (en)

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