JPH06329A - Exhaust gas treatment method for coal-fired boiler - Google Patents
Exhaust gas treatment method for coal-fired boilerInfo
- Publication number
- JPH06329A JPH06329A JP4184629A JP18462992A JPH06329A JP H06329 A JPH06329 A JP H06329A JP 4184629 A JP4184629 A JP 4184629A JP 18462992 A JP18462992 A JP 18462992A JP H06329 A JPH06329 A JP H06329A
- Authority
- JP
- Japan
- Prior art keywords
- tower
- activated carbon
- denitration
- desulfurization
- exhaust gas
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
Landscapes
- Treating Waste Gases (AREA)
Abstract
(57)【要約】
【目的】 活性炭の機械的損耗を低減して活性炭の使用
量を減少し、経済的に極めて有効にして、かつＣｌの濃
縮現象を抑制する石炭だきボイラーの排ガス処理方法を
提供すること。
【構成】 石炭だきボイラーからの排ガスの活性炭／乾
式脱硫・脱硝の２段処理方法において、再生塔４からの
活性炭を脱硫塔２と脱硝塔３とに各別に供給すると共
に、脱硫塔２と脱硝塔３とからの使用済み活性炭を各別
に再生塔４へ導くこと。
(57) [Summary] [Objective] A method for treating exhaust gas of a coal-fired boiler, which reduces mechanical wear of activated carbon, reduces the amount of activated carbon used, makes it extremely economically effective, and suppresses the concentration phenomenon of Cl. To provide. [Structure] In a two-stage treatment method of activated carbon / dry desulfurization / denitration of exhaust gas from a coal-fired boiler, activated carbon from a regeneration tower 4 is separately supplied to a desulfurization tower 2 and a denitration tower 3, and the desulfurization tower 2 and denitration Directing the used activated carbon from the tower 3 to the regeneration tower 4 separately.
Description
【０００１】[0001]
【産業上の利用分野】本発明は、微粉炭燃焼方式あるい
は流動床燃焼方式などの石炭だきボイラーからの排ガス
中に含まれるＳＯ2 、ＮＯx の濃度を低減する排ガス処
理方法であって、特に活性炭／乾式脱硫・脱硝の２段処
理方法に関する。FIELD OF THE INVENTION The present invention relates to an exhaust gas treatment method for reducing the concentration of SO 2 and NO x contained in the exhaust gas from a coal-fired boiler such as a pulverized coal combustion system or a fluidized bed combustion system. The present invention relates to a two-step treatment method of activated carbon / dry desulfurization / denitration.
【０００２】[0002]
【従来の技術】石炭が石油とともにエネルギー源として
使用されているが、石炭燃焼火力は石油燃焼火力に比し
て排ガス中のＳＯ2 、ＮＯx の含有量が多く、従来より
これらの濃度を低減する種々の方法が採られている。2. Description of the Related Art Coal is used as an energy source together with petroleum, but the coal burning thermal power has a larger content of SO 2 and NO x in the exhaust gas than the petroleum burning thermal power, and the concentration of these is lower than in the past. Various methods are adopted.
【０００３】その処理方法の一例に活性炭／乾式脱硫・
脱硝の２段処理方法があるが、図２にその従来例のフロ
ーシートを示す。白線矢印に示すように、ボイラーから
の排ガス１は、まず脱硫塔２に入り、該脱硫塔２内を移
動する（下降する）活性炭にＳＯ2 が吸着されて約９５
％の１次脱硫処理が行われる。An example of the treatment method is activated carbon / dry desulfurization.
Although there is a two-stage denitration treatment method, FIG. 2 shows a conventional flow sheet. As shown by the white arrow, the exhaust gas 1 from the boiler first enters the desulfurization tower 2, and SO 2 is adsorbed by the activated carbon that moves (descends) in the desulfurization tower 2 to about 95%.
% Primary desulfurization treatment is performed.
【０００４】そして、１次脱硫処理されて脱硫塔２から
出た排ガス１は、ＮＨ3 が混入されて脱硝塔３に入り、
該脱硝塔３内を移動する（下降する）活性炭の触媒作用
によりＮＯx と反応してＮＯが分解され、約８０％の脱
硝処理と副次的（２次的）に約５％の脱硫処理が行わ
れ、脱硝塔３を出た排ガス１は、脱硫率約１００％、脱
硝率約８０％に処理される。[0004] Then, the exhaust gas 1 leaving the desulfurization tower 2 is primary desulfurization, NH 3 is mixed enters the denitration tower 3,
NO is decomposed by reacting with NO x by the catalytic action of the activated carbon that moves (descends) in the denitration tower 3, and approximately 80% denitration treatment and secondary (secondary) desulfurization treatment of approximately 5% are performed. The exhaust gas 1 that has exited the denitration tower 3 is treated to a desulfurization rate of about 100% and a denitration rate of about 80%.
【０００５】而して、前記の活性炭は、黒線矢印に示す
ように、再生塔４（４００℃の加熱再生）→脱硝塔３→
脱硫塔２→再生塔４の直列的な循環経路によって供給さ
れている。なお、活性炭の脱硝塔３内及び脱硫塔２内の
滞留時間はそれぞれ５０時間程度に制御されている。The above-mentioned activated carbon, as shown by the black arrow, is a regeneration tower 4 (heat regeneration at 400 ° C.) → a denitration tower 3 →
It is supplied by a serial circulation path from the desulfurization tower 2 to the regeneration tower 4. The residence time of the activated carbon in the denitration tower 3 and the desulfurization tower 2 is controlled to about 50 hours.
【０００６】[0006]
【発明が解決しようとする課題】前記のように、従来の
排ガス処理方法においては、活性炭が直列的な循環経路
を移動することによって供給されているので、活性炭の
供給量は主に脱硫塔２の要求量（排ガス発生源の特性に
基づく）に支配されることとなる。しかし、この要求量
は脱硝塔３では過剰な量となり、多量の活性炭が脱硝塔
３内を滞留時間５０時間という移動速度で移動する際
に、粒子間の衝突がはげしくなって、活性炭の機械的損
耗量が多く、経済的に不都合な点がみられた。なお、活
性炭を加熱再生する際には化学的消耗もあるが、これは
ＮＨ3 の混入により低減される。例えば、出力：１，０
００ＭＷ、ＳＯ2 ：１，０００ppm の場合の機械的損耗
率は１．６％（脱硫筒０．８％、脱硝筒０．８％）、化
学的損耗率１．０％である。As described above, in the conventional exhaust gas treatment method, the activated carbon is supplied by moving in the serial circulation path, so the activated carbon is mainly supplied to the desulfurization tower 2. Will be governed by the required amount (based on the characteristics of the exhaust gas source). However, this required amount becomes an excessive amount in the denitrification tower 3, and when a large amount of activated carbon moves in the denitration tower 3 at a moving speed of a residence time of 50 hours, collision between particles becomes violent and the mechanical strength of the activated carbon is increased. There was a large amount of wear, which was an economical disadvantage. There is also chemical consumption when the activated carbon is heated and regenerated, but this is reduced by the incorporation of NH 3 . For example, output: 1,0
In the case of 00 MW and SO 2 : 1,000 ppm, the mechanical wear rate is 1.6% (desulfurization cylinder 0.8%, denitration cylinder 0.8%) and the chemical wear rate is 1.0%.
【０００７】また、石炭だきボイラーの排ガス中のＣｌ
は活性炭の表面に吸着するが、ＳＯ2 の吸着が優先する
ために脱硫塔２内ではＣｌを吸着せずに脱硝塔３内でＣ
ｌの吸着が行われる。ところで、従来例のように、活性
炭の供給が直列的な循環経路によって行われるため、脱
硝塔３内で吸着したＣｌは脱硫塔２内で脱離し、再び脱
硝塔３内で吸着が起るという作用の繰り返しによって、
脱硫塔２と脱硝塔３との間でＣｌの濃縮現象が起り、最
終的には脱硝塔３内の活性炭の表面が塩化物で閉塞され
てしまい、所期の脱硫、脱硝効果を期し得ないという不
都合な点がみられた。Also, Cl in the exhaust gas of a coal-fired boiler
Is adsorbed on the surface of the activated carbon, but SO 2 is prioritized, so that Cl is not adsorbed in the desulfurization tower 2 and C is adsorbed in the denitration tower 3.
Adsorption of 1 is performed. By the way, as in the conventional example, since activated carbon is supplied through a serial circulation path, Cl adsorbed in the denitration tower 3 is desorbed in the desulfurization tower 2 and adsorption occurs again in the denitration tower 3. By repeating the action,
A Cl concentration phenomenon occurs between the desulfurization tower 2 and the denitration tower 3, and finally the surface of the activated carbon in the denitration tower 3 is clogged with chlorides, and the desired desulfurization and denitration effects cannot be expected. The inconvenient point was seen.
【０００８】本発明は、かかる点に鑑みなされたもの
で、活性炭の機械的損耗を少なくして活性炭の使用量を
低減し、経済的に極めて有効にして、かつＣｌの濃縮現
象を抑制する石炭だきボイラーの排ガス処理方法を提供
することを目的とする。The present invention has been made in view of the above points, and is a coal that reduces mechanical wear of activated carbon to reduce the amount of activated carbon used, makes it extremely economically effective, and suppresses the concentration phenomenon of Cl. It is an object of the present invention to provide a method for treating exhaust gas from a diesel boiler.
【０００９】[0009]
【課題を解決するための手段】本発明は前記の目的を達
成するために、石炭だきボイラーからの排ガスの活性炭
／乾式脱硫・脱硝の２段処理方法において、再生塔から
の活性炭を脱硫塔と脱硝塔とに各別に供給すると共に、
脱硫筒と脱硝筒とからの使用済み活性炭を各別に再生塔
へ導くようにしたことにある。[Means for Solving the Problems] In order to achieve the above object, the present invention provides a two-stage treatment method of activated carbon / dry desulfurization / denitration of exhaust gas from a coal-fired boiler, in which activated carbon from a regeneration tower is combined with a desulfurization tower. While separately supplying to the denitration tower,
The purpose is to separately guide the used activated carbon from the desulfurization cylinder and the denitration cylinder to the regeneration tower.
【００１０】[0010]
【作用】脱硫塔、脱硝塔に供給する活性炭の量を各別に
制御する、即ち、脱硫塔には約９５％の１次脱硫処理を
するに必要な量の活性炭を供給し、脱硝塔には約８０％
の脱硝処理と約５％の２次脱硫処理をするために見合う
量の活性炭を供給するようにして、活性炭の脱硫塔内の
滞留時間を約５０時間、脱硝塔内の滞留時間を約２００
時間に制御することを可能とし、脱硝塔内での活性炭の
機械的損耗率が０．６％程度低減される。また、脱硫塔
からの使用済みの活性炭を直接再生塔へ導くことによ
り、Ｃｌの濃縮現象が抑制される。The amount of activated carbon supplied to the desulfurization tower and the denitration tower is controlled separately, that is, about 95% of the amount of activated carbon required for the primary desulfurization treatment is supplied to the desulfurization tower, and the denitration tower is supplied to the denitration tower. About 80%
The denitrification treatment and the secondary desulfurization treatment of about 5% are performed by supplying an appropriate amount of activated carbon, and the activated carbon has a residence time in the desulfurization tower of about 50 hours and a residence time in the denitrification tower of about 200.
It is possible to control the time, and the mechanical wear rate of the activated carbon in the denitration tower is reduced by about 0.6%. Further, by directly guiding the used activated carbon from the desulfurization tower to the regeneration tower, the Cl concentration phenomenon is suppressed.
【００１１】[0011]
【実施例】本発明の実施例を図面を参照して説明する。
なお、従来例と同一部品には同一符号を付す。図１の白
線矢印に示すように、石炭だきボイラーからの排ガス１
は、まず脱硫塔２に入って該塔２内を移動する活性炭に
より約９５％の１次脱硫処理が行われ、次いでＮＨ3 が
混入されて脱硝塔３に入った排ガス１は、該塔３内を移
動する活性炭によって約８０％の脱硝処理と約５％の２
次脱硫処理が行われる。この点は従来例と同様である。Embodiments of the present invention will be described with reference to the drawings.
The same parts as those in the conventional example are designated by the same reference numerals. Exhaust gas from coal-fired boiler 1 as shown by the white line arrow in FIG.
The primary desulfurization of about 95% activated carbon to move the tower in 2 is performed by first entering the desulfurization tower 2, and then the exhaust gas 1 NH 3 came mixed into denitrating tower 3, the tower 3 About 80% of denitration treatment and about 5% of 2 by activated carbon moving inside
Next desulfurization treatment is performed. This point is similar to the conventional example.
【００１２】而して、活性炭は、黒線矢印に示すよう
に、 脱硫塔２と脱硝塔３とに各別に供給され、また両塔２，
３の使用済みの活性炭が再生塔４に各別に導入されるよ
うになっている。即ち、再生塔４、脱硫塔２、脱硝塔３
とが並列に、活性炭供給経路と使用済み活性炭の回収経
路によって連結されているものである。[0012] Thus, activated carbon, as shown by the black arrow, Desulfurization tower 2 and denitration tower 3 are supplied separately, and both towers 2,
The used activated carbon 3 is introduced into the regeneration tower 4 separately. That is, the regeneration tower 4, the desulfurization tower 2, the denitration tower 3
And are connected in parallel by an activated carbon supply route and a used activated carbon recovery route.
【００１３】よって、脱硫塔２と脱硝塔３への活性炭の
供給量を各別に制御するので、従来のように、脱硝塔３
への活性炭供給量が脱硫塔２への活性炭供給量に支配さ
れるということがなくなり、脱硫塔２内の活性炭滞留時
間は従来例のように約５０時間に制御するが、脱硝塔３
内の活性炭滞留時間を約２００時間という長時間に制御
することが可能となり、機械的損耗率が約０．６％低減
し、活性炭全量の機械的損耗率は１．０％（脱硫塔２内
で０．８％、脱硝塔３内で０．２％）となる。Therefore, since the supply amounts of activated carbon to the desulfurization tower 2 and the denitration tower 3 are controlled separately, as in the conventional case, the denitration tower 3
The amount of activated carbon supplied to the desulfurization tower 2 is no longer controlled by the amount of activated carbon supplied to the desulfurization tower 2, and the residence time of activated carbon in the desulfurization tower 2 is controlled to about 50 hours as in the conventional example.
It is possible to control the activated carbon residence time in the long time of about 200 hours, the mechanical wear rate is reduced by about 0.6%, and the mechanical wear rate of the entire activated carbon is 1.0% (in the desulfurization tower 2 Of 0.8% and 0.2% in the denitration tower 3.
【００１４】前記のように、脱硝塔３内での活性炭の機
械的損耗率が約０．６％低減するので、活性炭の使用量
が減少し、下記のように経済的に極めて有利である。 6,000ton／年×（0.6 ％／2.6 ％）×100,000 円／ton
＝138,500 千円／年 （0.6 ％低減分、2.6 ％：従来例の損耗率1.6 ％＋本発
明の損耗率1.0 ％） また、脱硫塔２からの使用済みの活性炭を直接再生塔４
へ導くので、Ｃｌの濃縮現象は抑制される。As described above, since the mechanical wear rate of the activated carbon in the denitration tower 3 is reduced by about 0.6%, the amount of the activated carbon used is reduced, which is economically extremely advantageous as described below. 6,000 tons / year x (0.6% / 2.6%) x 100,000 yen / ton
= 138,500 thousand yen / year (0.6% reduction, 2.6%: conventional example wear rate 1.6% + present invention wear rate 1.0%) In addition, the used activated carbon from the desulfurization tower 2 is directly regenerated in the tower 4.
Therefore, the concentration phenomenon of Cl is suppressed.
【００１５】[0015]
【発明の効果】本発明は、脱硫塔と脱硝塔とに活性炭を
各別に供給すると共に、両塔での使用済み活性炭を各別
に再生塔へ導くようにしたので、 （ａ） 活性炭の機械的損耗率が低減し、活性炭の使用
量の減少に伴う経済的効果が大きい。 （ｂ） Ｃｌの濃縮現象を抑制することができ、脱硫、
脱硝効果を向上することができる。According to the present invention, the activated carbon is separately supplied to the desulfurization tower and the denitration tower, and the used activated carbon in both towers is separately guided to the regeneration tower. (A) Mechanical properties of activated carbon The wear rate is reduced, and the economic effect is large with the decrease in the amount of activated carbon used. (B) The concentration phenomenon of Cl can be suppressed, and desulfurization,
The denitration effect can be improved.
【図１】本発明の実施例を示すフローシートである。FIG. 1 is a flow sheet showing an example of the present invention.
【図２】従来例のフローシートである。FIG. 2 is a flow sheet of a conventional example.
１ 石炭だきボイラーからの排ガス ２ 脱硫塔 ３ 脱硝塔 ４ 再生塔 1 Exhaust gas from coal-fired boiler 2 Desulfurization tower 3 Denitration tower 4 Regeneration tower
Claims (1)
／乾式脱硫・脱硝の２段処理方法において、再生塔から
の活性炭を脱硫塔と脱硝塔とに各別に供給すると共に、
脱硫筒と脱硝筒とからの使用済み活性炭を各別に再生塔
へ導くことを特徴とする石炭だきボイラーの排ガス処理
方法。1. In a two-stage treatment method of activated carbon / dry desulfurization / denitration of exhaust gas from a coal-fired boiler, activated carbon from a regeneration tower is separately supplied to a desulfurization tower and a denitration tower, and
A method for treating exhaust gas from a coal-fired boiler, characterized in that used activated carbon from a desulfurization cylinder and a denitration cylinder is separately introduced to a regeneration tower.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4184629A JPH06329A (en) | 1992-06-19 | 1992-06-19 | Exhaust gas treatment method for coal-fired boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4184629A JPH06329A (en) | 1992-06-19 | 1992-06-19 | Exhaust gas treatment method for coal-fired boiler |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06329A true JPH06329A (en) | 1994-01-11 |
Family
ID=16156577
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4184629A Pending JPH06329A (en) | 1992-06-19 | 1992-06-19 | Exhaust gas treatment method for coal-fired boiler |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06329A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108607346A (en) * | 2018-05-21 | 2018-10-02 | 中冶华天工程技术有限公司 | Parallel active coke dry-method desulfuration denitrating system |
-
1992
- 1992-06-19 JP JP4184629A patent/JPH06329A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108607346A (en) * | 2018-05-21 | 2018-10-02 | 中冶华天工程技术有限公司 | Parallel active coke dry-method desulfuration denitrating system |
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