JP7495861B2 - Catalyst regeneration device and catalyst regeneration confirmation method - Google Patents
Catalyst regeneration device and catalyst regeneration confirmation method Download PDFInfo
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- 230000008929 regeneration Effects 0.000 title claims description 131
- 238000011069 regeneration method Methods 0.000 title claims description 131
- 239000003054 catalyst Substances 0.000 title claims description 55
- 238000000034 method Methods 0.000 title claims description 15
- 238000012790 confirmation Methods 0.000 title claims description 4
- 238000010521 absorption reaction Methods 0.000 claims description 111
- 239000007788 liquid Substances 0.000 claims description 100
- 239000002699 waste material Substances 0.000 claims description 40
- 238000006555 catalytic reaction Methods 0.000 claims description 24
- 238000001139 pH measurement Methods 0.000 claims description 24
- 238000011144 upstream manufacturing Methods 0.000 claims description 9
- 239000007791 liquid phase Substances 0.000 claims description 8
- 230000001172 regenerating effect Effects 0.000 claims description 7
- 238000002485 combustion reaction Methods 0.000 claims description 5
- 239000012071 phase Substances 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 3
- 239000007789 gas Substances 0.000 description 7
- 238000004458 analytical method Methods 0.000 description 5
- 238000005259 measurement Methods 0.000 description 5
- 230000007423 decrease Effects 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 230000010365 information processing Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 239000000523 sample Substances 0.000 description 2
- WWILHZQYNPQALT-UHFFFAOYSA-N 2-methyl-2-morpholin-4-ylpropanal Chemical compound O=CC(C)(C)N1CCOCC1 WWILHZQYNPQALT-UHFFFAOYSA-N 0.000 description 1
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 1
- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 description 1
- 229910052921 ammonium sulfate Inorganic materials 0.000 description 1
- 235000011130 ammonium sulphate Nutrition 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 239000002574 poison Substances 0.000 description 1
- 231100000614 poison Toxicity 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000004448 titration Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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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 method for confirming catalyst regeneration.
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 NH3 are generated when ammonium sulfate and ammonium hydrogen sulfate, which are catalyst poisons, are decomposed by heating. Some of the NH3 is oxidized by the catalyst to become NOx, which is decomposed and removed on the catalyst. Regeneration is considered complete when the concentration of SOx decreases.
The confirmation method is as follows: (1) measuring the SOx concentration with a continuous SO2 analyzer; (2) measuring the SOx concentration in batches by manual analysis; (3) setting the regeneration time in advance based on the past plant performance.
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 documents 1 and 2 operate with a preset regeneration time, but do not disclose a method for determining when the regeneration time is complete.
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 SO2 is oxidized by a catalyst to become SO3 . SO3 cannot be measured by a continuous SO2 analyzer, and the decrease in the SO3 concentration cannot be confirmed.
(2A) The SOx concentration of the absorbing liquid that has absorbed the regeneration air is analyzed by an analysis agency or the like using an ion chromatograph, rather than on-site. Alternatively, the SOx concentration can be analyzed on-site by neutralization titration, but either method requires work by a specialized analysis company over several days.
(3A) Because the operating conditions differ for each plant, and the waste quality varies even in the same plant, if the regeneration time is determined based on past performance, there is a possibility that the catalyst will not be regenerated sufficiently. In addition, there is a method to allow for a sufficient margin in the regeneration time, but this will require setting a long shutdown time, and adding excessive 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。 The present invention aims to provide a catalyst regeneration device and a method for confirming the completion of catalyst regeneration by measuring the pH of the absorption 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 regenerating device of the present invention comprises:
a catalytic reaction tower (1) into which a combustion exhaust gas (discharged from a combustion furnace) is introduced and which causes a catalytic reaction;
a catalyst regeneration heater (2) used for heating and regenerating the catalyst stored in the catalytic reaction tower (1);
a regeneration air circulation line (L1) leading from the catalytic reaction tower (1) and returning to the catalytic reaction tower (1) via the catalyst regeneration heater (2);
A circulation blower (3) provided in the regeneration air circulation line (L1);
a regeneration air absorption section (5) provided downstream of the circulation blower (3) in the regeneration air circulation line (L1) (and upstream of the catalyst regeneration heater (2));
a pH measuring section (6) for measuring the pH of the absorbing liquid into which the regeneration air has been absorbed in the regeneration air absorption section (5);
Equipped with.
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 regeneration air absorption section (5) may be provided in a branch line (L11) branched off from the regeneration air circulation line (L1) downstream of the circulation blower (3), and the branch line (L11) may join the regeneration air circulation line (L1) upstream of the circulation blower (3). The branch line (L11) may be provided with valves (V2, V3, e.g., ON/OFF gate valves, flow control valves, etc.) upstream and/or downstream of the regeneration air absorption section (5). The regeneration air absorption section (5) may be provided with a separate valve for introducing and/or discharging the regeneration 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 regeneration air circulation line (L1) may be provided with a valve (V1, for example, an ON/OFF gate valve, a flow control valve, etc.) on the discharge side (line inlet side) and/or the return side (line outlet side) of the catalytic reaction tower (1).
A discharge branch line (L12) may be provided which branches off from the downstream side of the circulation blower (3) of the regeneration air circulation line (L1) and leads to a dust collection facility. The discharge branch line (L12) may be provided with a valve (V8, for example, an ON/OFF gate valve, a flow 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 regeneration air absorption section (5) comprises:
An absorption bottle (51) for storing an absorption liquid;
a feed line (L51) for feeding the regeneration air from the branch line (L11) into the liquid phase of the absorption liquid in the absorption bottle (51);
an outlet line (L52) for extracting (absorbed) regeneration air from the gas phase of the absorption bottle (51) and sending it to the branch line (L11);
A flow control valve (52) (a flow meter and a flow rate adjustment valve that adjusts the flow rate in response to the flow rate) provided in the outlet line (L52);
a waste liquid discharge line (L53) through which the waste liquid is discharged from the absorption bottle (51) (the waste liquid discharge line is provided with a waste liquid discharge valve (V53));
a waste liquid tank (53) for storing the waste liquid sent through the waste liquid discharge line (L53);
a three-way valve (55) provided in the feed line (L51) upstream of the absorption bottle (51);
an absorption liquid tank (56) for storing the absorption liquid to be guided to the three-way valve (55) and sent to the absorption bottle (51);
an absorption liquid replenishment line (L54) extending from the absorption liquid tank (56) to the three-way valve (55);
a liquid delivery pump (57) provided in the absorption liquid replenishment line (L54) for delivering the absorption liquid;
It may have some or more of the above.
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 regeneration air absorption section (5) comprises:
an absorption treatment mode in which, during regeneration (or during a predetermined period of time (10 to 60 minutes, 1 L/min flow rate) from the start of regeneration, a valve (V2, V3) of the branch line (L11) is opened (and/or a three-way valve is switched) to send the regeneration air to the absorption bottle (51) and to switch the three-way valve (55) and control the valve (valve of the branch line L11) so as to return the regeneration air that has been absorbed from the branch line (L11) to the regeneration air circulation line (L1);
a waste liquid discharge mode for controlling the waste liquid discharge valve (V53) so as to discharge waste liquid (used absorbing liquid) from the absorption bottle (51) to a waste liquid tank (53);
an absorption liquid replenishment mode in which the three-way valve (55) is switched and the liquid feed pump (57) is controlled so as to replenish the absorption bottle (51) with the absorption liquid after the waste liquid is discharged;
a pH measurement mode in which pH measurement is automatically performed (continuously or batchwise) by the pH measurement unit (6) during or after the absorption treatment mode;
The mode control unit (501) may control 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 may directly measure the pH of the liquid phase in the absorption bottle (51).
The absorption bottle (51) may be configured to be detachable. In such a case, the pH measurement unit (6) may insert a measurement probe from an opening of the absorption bottle (51) to measure the pH of the liquid phase automatically or manually.
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。
Another method for confirming catalyst regeneration according to the present invention is to
a pH measurement step of absorbing the regeneration air discharged from the catalytic reaction tower (1) into an absorbing liquid in a regeneration air absorption section (5) and continuously or discontinuously measuring the pH of the absorbing liquid into which the regeneration air has been absorbed;
The method includes 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.
Completion of catalyst regeneration may be determined, for example, when the pH value is 6 or more and the pH value no longer fluctuates (is stable) (the change (slope) per unit of time is below a threshold value).
The absorbing liquid may be, for example, pure water or hydrogen peroxide solution.
There may be one or more absorption bottles.
［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, the timing of catalyst regeneration completion can be grasped more accurately than by measuring and monitoring with a SO2 continuous analyzer.
There is no need for specialized analysts to carry out analysis on-site.
Analysis can be easily performed on-site without relying on external analytical agencies.
Since it is possible to confirm the completion of catalyst regeneration, there is no need to allow for leeway in the catalyst regeneration process time, and the time required for catalyst regeneration process can be shortened, which in turn shortens the shutdown period and reduces the amount of electricity used by the heater for catalyst regeneration.
（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 a catalyst regenerating device 100 according to a first embodiment.
The catalyst regeneration device 100 includes a catalytic reaction tower 1 , a catalyst regeneration heater 2 , a circulation blower 3 , a regeneration air absorption section 5 , and a pH measurement section 6 .
The catalytic reaction tower 1 is a reaction tower into which the combustion exhaust gas discharged from the combustion furnace is introduced and which causes a catalytic reaction. Examples of the catalyst disposed in the catalytic reaction tower 1 include a denitrification catalyst.
The catalyst regeneration heater 2 is used to heat and regenerate the catalyst stored in the catalytic reaction tower 1. The regeneration air circulation line L1 is a pipe that is led out from the catalytic reaction tower 1 and returns to the catalytic reaction tower 1 via the catalyst regeneration heater 2. A circulation blower 3 is provided in the regeneration air circulation line L1.
The regeneration air circulation line L1 is provided with a valve V1 on the outlet side (line inlet side) of the catalytic reaction tower 1. The valve V1 is an ON/OFF gate valve.
In addition, a discharge branch line L12 is provided, which branches off from the regeneration air circulation line L1 downstream of the circulation blower 3 and leads to a dust collection facility (not shown). A valve V8 is provided in the discharge branch line L12. The valve V8 is an ON/OFF gate 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 regeneration air absorption section 5 is provided in a branch line L11 branched off from the regeneration air circulation line L1 downstream of the circulation blower 3. The branch line L11 joins the regeneration air circulation line L1 upstream of the circulation blower 3.
In the branch line L11, valves V2 and V3 are provided upstream and downstream of the regeneration air absorbing section 5. The valves V2 and V3 are ON/OFF gate valves. The pH measuring section 6 measures the pH of the absorption liquid in which the regeneration air has been absorbed in the regeneration air absorbing section 5 continuously or at a predetermined timing. In this embodiment, the pH measuring section 6 is attached to the absorption bottle 51 and directly measures the pH of the liquid phase in 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 regeneration air absorption section 5 and a pH measurement section 6 .
The regeneration air absorption section 5 includes an absorption bottle 51 for storing the absorption liquid, an inlet line L51 for sending the regeneration air from the branch line L11 to the liquid phase of the absorption liquid in the absorption bottle 51, an outlet line L52 for drawing out the regeneration air that has been absorbed from the gas phase of the absorption bottle 51 and sending it to the branch line L11, and a flow control valve 52 provided in the outlet line L52. The flow control valve 52 is composed of a flow meter and a flow adjustment valve that adjusts the flow rate depending on the result of the flow meter.
The regeneration air absorption section 5 also includes a waste liquid discharge line L53 through which the waste liquid is discharged from the absorption bottle 51, a waste liquid discharge valve V53 provided in the waste liquid discharge line L53, and a waste liquid tank 53 for storing the waste liquid.
Furthermore, a three-way valve 55 is provided on the feed line L51.
The regeneration air absorption section 5 also includes an absorption liquid tank 56 that stores the absorption liquid that is guided to the three-way valve 55 and sent to the absorption bottle 51, an absorption liquid replenishment line L54 that runs from the absorption liquid tank 56 to the three-way valve 55, and a liquid delivery pump 57 that is provided in the absorption liquid replenishment line L54 and delivers 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 this embodiment, it is preferable to set the distance from the branch line L11 to the absorption bottle 51 (or the distance of the feed line L51 from the three-way valve 55 to the absorption bottle 51) as short as possible, for example, within 200 mm, within 100 mm. This is because it is desired to prevent SOx (especially SO3 ) from remaining in the feed 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。
The regeneration air absorption unit 5 also includes a mode control unit 501 .
an absorption treatment mode in which the mode control unit 501 opens the valve V2 of the branch line L11 and switches the three-way valve 55 to introduce the air into the absorption bottle 51 during regeneration (or during timer operation for a predetermined period of time (10 to 60 minutes, 1 L/min flow rate) from the start of regeneration), switches the three-way valve 55 and controls the valves V2 and V3 (valves provided in the branch lines) so as to send the regeneration air to the absorption bottle 51 and return the regeneration air that has been absorbed from the branch line L11 to the regeneration air circulation line L1;
a waste liquid discharge mode for controlling the waste liquid discharge valve V53 so as to discharge waste liquid (used absorbing liquid) into the absorption bottle 51 and into the waste liquid tank 53;
an absorption liquid replenishment mode in which the three-way valve 55 is switched and the liquid supply pump 57 is controlled so as to replenish the absorption bottle 51 with the absorption liquid after the waste liquid is discharged;
A pH measurement mode in which pH measurement is performed as a batch measurement by the pH measuring unit 6 while overlapping with a part of the absorption treatment mode or after the absorption treatment mode is switched between these modes.
After the pH measurement as a batch measurement, the mode control unit 501 sends the absorbing liquid from the absorption bottle 51 to the waste liquid tank 53, and then closes the waste liquid discharge valve V53 (or the waste liquid discharge valve may be left open). The three-way valve 55 is switched, and the liquid feed pump 57 is driven to send the absorbing liquid from the absorbing liquid tank 56 to the absorption bottle 51, and the residual SOx in the feed line L51 and the absorption bottle 51 is washed. After washing with a certain amount of the absorbing liquid, the waste liquid discharge valve V53 is opened, and the washed liquid is discharged to the waste liquid tank 53. Thereafter, the waste liquid discharge valve V53 is closed, and a predetermined amount of the absorbing liquid is sent to the absorption bottle 51. The liquid feed pump 57 is stopped, and the three-way valve 55 is switched. The system waits until it is determined that the next catalyst regeneration is complete.
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 regeneration air absorption unit 5 may have a judgment unit 7 that judges that catalyst regeneration is complete if the pH value measured by the pH measurement unit 6 is within a predetermined range. In addition to the judgment unit 7, the pH measurement value may be displayed on a monitor so that an operator can judge the completion of regeneration. In such a case, the judgment unit 7 may function as an aid to the operator's judgment.
The determination unit 7 may determine that regeneration is complete when, for example, the pH value is 6 or more and the pH value has stopped fluctuating (is stable) (the change (slope) per unit of time is less than a 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 regeneration air absorption unit 5 may have a control unit 10 that controls the start and stop of catalyst regeneration. When catalyst regeneration starts, the control unit 10 drives the circulation blower 3 and the catalyst regeneration heater 2 and opens the valve V1 of the regeneration air circulation line L1. When catalyst regeneration starts, the control unit 10 also closes the dampers on the exhaust gas upstream side and the exhaust gas downstream side of the catalytic reaction tower 1.
When the judgment unit 7 judges that regeneration is complete, or when manual intervention such as an operator's judgment is made, the control unit 10 stops the circulation blower 3 and the catalyst regeneration heater 2, and closes the valve V1 of the regeneration air circulation line L1.
The mode control unit 501, the control unit 10, and the determination unit 7 may be configured as an information processing device (e.g., a computer, a server) having a memory, a processor, and a software program, a dedicated circuit, firmware, etc. The information processing device may be either on-premise or on 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 for performing a manual pH measurement.
The regeneration air absorption section 5 includes an absorption bottle 51 for storing absorption liquid, an inlet line L51 for sending regeneration air from the branch line L11 to the liquid phase of the absorption liquid in the absorption bottle 51, an outlet line L52 for drawing out the regeneration air that has been absorbed from the gas phase of the absorption bottle 51 and sending it to the branch line L11, and a flow control valve 52 provided in the outlet line L52.
When measuring pH, valves V2 and V3 are closed, the absorption bottle 51 is removed from the branch line L11, and a measurement probe is inserted from the opening of the absorption bottle 51, so that the pH of the liquid phase can be manually measured by the pH measuring unit 6.
During manual measurement, an absorption bottle containing a replacement absorbing liquid may be set in 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 as follows:
a pH measurement step of absorbing the regeneration air discharged from the catalytic reaction tower 1 into an absorbing liquid in the regeneration air absorption section 5, and continuously or discontinuously measuring the pH of the absorbing liquid into which the regeneration air has been absorbed;
The method includes 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.
Completion of catalyst regeneration may be determined, for example, when the pH value is 6 or more and the pH value no longer fluctuates (is stable) (the change (slope) per unit of time is below a threshold value).
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 Catalytic reaction tower 2 Catalyst regeneration heater 3 Circulation blower 5 Regeneration air absorption section 6 pH measurement section
Claims (5)
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 into which the combustion exhaust gas is introduced and which causes a catalytic reaction;
a catalyst regeneration heater used for heating and regenerating the catalyst stored in the catalytic reaction tower;
a regeneration air circulation line leading from the catalytic reaction tower and returning to the catalytic reaction tower via the catalyst regeneration heater;
A circulation blower provided in the regeneration air circulation line;
a regeneration air absorption section provided downstream of the circulation blower in the regeneration air circulation line;
a pH measuring unit for measuring a pH of an absorbing liquid in which the regeneration air is absorbed by the regeneration air absorbing unit;
A catalyst regenerating device comprising:
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 branches off from the regeneration air circulation line downstream of the circulation blower and joins the regeneration air circulation line upstream of the circulation blower;
The regeneration air absorption section comprises:
an absorption bottle for storing an absorbing liquid;
a feed line for feeding the regeneration air from the branch line into the liquid phase of the absorption liquid in the absorption bottle;
an outlet line for extracting regeneration air from the gas phase of the absorption bottle and sending it to the branch line;
A flow control valve provided in the outlet line;
The catalyst regeneration device according to claim 1 .
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 regeneration air absorption section comprises:
a waste liquid discharge line through which the waste liquid is discharged from the absorption bottle;
a waste liquid tank for storing the waste liquid delivered through the waste liquid discharge line;
a three-way valve provided in the feed line upstream of the absorption bottle;
an absorption liquid tank for storing the absorption liquid that is guided to the three-way valve and sent to the absorption bottle;
an absorbing liquid refill line extending from the absorbing liquid tank to the three-way valve;
a liquid delivery pump provided in the absorption liquid replenishment line for delivering the absorption liquid;
The catalyst regenerator of claim 2 further comprising:
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 regeneration air absorption section comprises:
an absorption treatment mode in which, during regeneration, the valve of the branch line is opened, the regeneration 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 regeneration air that has been absorbed is returned from the branch line to the regeneration air circulation line;
a waste liquid discharge mode for controlling a waste liquid discharge valve so as to discharge waste liquid from the absorption bottle to a waste liquid tank;
an absorption liquid refilling mode in which the three-way valve is switched and the liquid sending pump is controlled so as to refill the absorption bottle with the absorption liquid after the waste liquid is discharged;
A pH measurement mode in which a pH measurement is performed by a pH measurement unit during or after the absorption treatment mode.
The catalyst regenerating device according to claim 3 , further comprising a mode control unit that controls:
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 of absorbing the regeneration air led out from the catalytic reaction tower into an absorbing liquid in a regeneration air absorption section, and continuously or discontinuously measuring the pH of the absorbing liquid into which the regeneration air has been absorbed;
The catalyst regeneration confirmation method includes 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.
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| JP2008073665A (en) | 2006-09-25 | 2008-04-03 | Takuma Co Ltd | Catalyst regeneration method and regeneration facility |
| JP2010058067A (en) | 2008-09-04 | 2010-03-18 | Takuma Co Ltd | Method for regenerating denitration catalyst, unit for regenerating denitration catalyst and apparatus for treating exhaust gas by using the unit |
| JP2011036736A (en) | 2009-08-06 | 2011-02-24 | Sumitomo Heavy Ind Ltd | Exhaust gas treatment system and facility for cleaning desorption gas |
| JP2015116520A (en) | 2013-12-17 | 2015-06-25 | 三菱日立パワーシステムズ株式会社 | Wet type flue-gas desulfurization apparatus and application method of the wet type flue-gas desulfurization apparatus |
| WO2015159657A1 (en) | 2014-04-15 | 2015-10-22 | 株式会社Ihi | Desulfurization apparatus, and exhaust gas treatment system equipped with same |
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