JPH0480156B2 - - Google Patents
Info
- Publication number
- JPH0480156B2 JPH0480156B2 JP16900385A JP16900385A JPH0480156B2 JP H0480156 B2 JPH0480156 B2 JP H0480156B2 JP 16900385 A JP16900385 A JP 16900385A JP 16900385 A JP16900385 A JP 16900385A JP H0480156 B2 JPH0480156 B2 JP H0480156B2
- Authority
- JP
- Japan
- Prior art keywords
- black liquor
- concentration
- liquor temperature
- temperature
- injected
- 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.)
- Expired
Links
- 238000002347 injection Methods 0.000 claims description 27
- 239000007924 injection Substances 0.000 claims description 27
- 238000011084 recovery Methods 0.000 claims description 27
- 238000002485 combustion reaction Methods 0.000 claims description 21
- 238000000034 method Methods 0.000 claims description 10
- 230000008859 change Effects 0.000 claims description 7
- 238000010411 cooking Methods 0.000 claims description 6
- 230000009467 reduction Effects 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 3
- 239000002994 raw material Substances 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 2
- 238000001514 detection method Methods 0.000 claims 3
- 239000007789 gas Substances 0.000 description 19
- 238000010586 diagram Methods 0.000 description 8
- 239000010446 mirabilite Substances 0.000 description 6
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 5
- 230000007423 decrease Effects 0.000 description 5
- 238000006722 reduction reaction Methods 0.000 description 4
- 230000007774 longterm Effects 0.000 description 3
- 238000009835 boiling Methods 0.000 description 2
- 239000000567 combustion gas Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000009194 climbing Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- VDQVEACBQKUUSU-UHFFFAOYSA-M disodium;sulfanide Chemical compound [Na+].[Na+].[SH-] VDQVEACBQKUUSU-UHFFFAOYSA-M 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 239000012716 precipitator Substances 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- RSIJVJUOQBWMIM-UHFFFAOYSA-L sodium sulfate decahydrate Chemical compound O.O.O.O.O.O.O.O.O.O.[Na+].[Na+].[O-]S([O-])(=O)=O RSIJVJUOQBWMIM-UHFFFAOYSA-L 0.000 description 1
- 150000004763 sulfides Chemical class 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Landscapes
- Paper (AREA)
- Incineration Of Waste (AREA)
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、パルプ生産工程における回収ボイラ
の操業管理に利用される装置に係わり、特に前記
回収ボイラから排出される燃焼排ガス内のSO2濃
度を低減する手段の改良に関する。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a device used for operational management of a recovery boiler in a pulp production process, and in particular, to control the SO 2 concentration in the combustion exhaust gas discharged from the recovery boiler. This invention relates to improvements in means for reducing.
一般に、パルプ生産工程においては、チツプ蒸
解工程より廃液として生じる黒液を燃焼し、発電
等に用いる蒸気を発生させると共にチツプ蒸解用
薬剤原料を回収する回収ボイラが使用されてい
る。この回収ボイラにおいては、黒液噴射機構に
より前記黒液が炉内へ噴射されると、この黒液が
浮遊乾燥して炉底部にチヤーベツドを形成し、こ
のチヤーベツドが燃焼することにより蒸気を発生
させ、かつその際の還元反応によつて薬剤原料を
回収するものとなつている。
Generally, in the pulp production process, a recovery boiler is used to burn the black liquor produced as waste liquid from the chip cooking process, to generate steam used for power generation, etc., and to recover chemical raw materials for chip cooking. In this recovery boiler, when the black liquor is injected into the furnace by the black liquor injection mechanism, this black liquor floats and dries to form a chamber bed at the bottom of the furnace, and when this chamber bed is combusted, steam is generated. , and the drug raw material is recovered by the reduction reaction at that time.
ところで、回収ボイラに噴射される黒液には硫
化物が含まれている。このため、燃焼すると排ガ
ス内にSO2が含まれるおそれがある。このSO2は
公害物質であり、規制値以下に抑制して外部へ排
出しなければならない。そこで、従来は回収ボイ
ラ内に投入される燃焼用空気量を調整して燃焼状
態を変化させることによりSO2濃度を制御するも
のとなつていた。 By the way, the black liquor injected into the recovery boiler contains sulfides. Therefore, when burned, there is a risk that SO 2 will be included in the exhaust gas. This SO 2 is a pollutant and must be suppressed to below regulatory limits before being discharged to the outside. Conventionally, therefore, the SO 2 concentration was controlled by adjusting the amount of combustion air introduced into the recovery boiler to change the combustion state.
しかるに、前記回収ボイラにおいては、ナトリ
ウム分の回収効率を高めるために、燃焼排ガス中
に含まれている芒硝（Na2SO4）を回収し、この
芒硝を黒液に混入した後、再びボイラ内に噴射さ
せて燃焼させるものとなつているが、上記芒硝の
回収量すなわち黒液への混入量は種々の要因によ
つて変動しやすい。この芒硝の混入量の変動は直
ちに燃焼排ガス中のSO2濃度に影響を与える。し
たがつて、前述したように燃焼用空気量を調節し
ただけでは、SO2濃度を十分に制御することはで
きなかつた。
However, in the recovery boiler, in order to increase the recovery efficiency of sodium components, the mirabilite (Na 2 SO 4 ) contained in the combustion exhaust gas is recovered, and after this mirabilite is mixed into the black liquor, it is reintroduced into the boiler. However, the amount of Glauber's salt recovered, ie, the amount mixed into the black liquor, tends to vary depending on various factors. Changes in the amount of mirabilite mixed in immediately affect the SO 2 concentration in the combustion exhaust gas. Therefore, it was not possible to sufficiently control the SO 2 concentration simply by adjusting the amount of combustion air as described above.
そこで本発明は、回収ボイラから排出される燃
焼排ガス中に含まれるSO2濃度を高精度に制御で
き、SO2濃度が上昇した場合には速やかに抑制す
ることが可能な回収ボイラのSO2濃度低減装置を
提供することを目的とする。 Therefore, the present invention aims to reduce the SO 2 concentration in the recovery boiler, which can control the SO 2 concentration contained in the combustion exhaust gas discharged from the recovery boiler with high precision, and can quickly suppress the SO 2 concentration when it increases. The purpose is to provide a reduction device.
本発明は、上記問題点を解決し目的を達成する
ために、回収ボイラ内に噴射される黒液の温度を
検出し、この検出された黒液温度が所定の噴射黒
液温度となるように調節すると共に、前記回収ボ
イラの燃焼排ガス内のSO2濃度を検知し、この検
知されたSO2濃度に応じて前記噴射黒液温度を制
御するようにしたものである。
In order to solve the above problems and achieve the purpose, the present invention detects the temperature of black liquor injected into a recovery boiler, and adjusts the temperature of the black liquor so that the detected black liquor temperature becomes a predetermined injected black liquor temperature. At the same time, the SO 2 concentration in the combustion exhaust gas of the recovery boiler is detected, and the injected black liquor temperature is controlled in accordance with the detected SO 2 concentration.
本発明は、このような手段を講じたことによ
り、SO2濃度の変動に応じて黒液温度が変化し、
SO2濃度の変動が抑制される。
By taking such measures, the present invention allows the black liquor temperature to change in accordance with fluctuations in SO 2 concentration,
Fluctuations in SO 2 concentration are suppressed.
以下、本発明の実施例を説明するにあたり、先
ず、この発明の原理について説明する。回収ボイ
ラにおける種々の特性調査によつて次に示す原理
が判明している。すなわち、燃料となる噴射黒液
温度を上昇させると過渡的には第２図に示す如く
燃焼排ガス中のSO2濃度が減少する。また、長期
的には第４図に示す如く燃焼排ガス中のSO2濃度
が最小となる噴射黒液温度が存在する。
EMBODIMENT OF THE INVENTION Below, in describing the embodiments of the present invention, first, the principle of the present invention will be explained. The following principle has been clarified through various investigations of the characteristics of recovery boilers. That is, when the temperature of the injected black liquor serving as fuel is increased, the SO 2 concentration in the combustion exhaust gas decreases transiently as shown in FIG. 2. Furthermore, in the long term, as shown in FIG. 4, there is an injection black liquor temperature at which the SO 2 concentration in the combustion exhaust gas becomes minimum.
本発明は以上の原理に基いてなされたものであ
り、以下、本発明の実施例について説明する。 The present invention has been made based on the above principle, and examples of the present invention will be described below.
第１図は本発明の第１の実施例の構成を示す系
統図である。同図において１０は回収ボイラであ
つて、このボイラ１０内には噴射黒液１１が噴射
ガン１２により投入される。この投入された噴射
黒液１１は、回収ボイラ１０内にて浮遊乾燥し、
炉底部に着床してチヤーベツド１３を形成する。
そして、チヤーベツド１３上の高温雰囲気によつ
て還元反応が行なわれ、噴射黒液１１中の芒硝は
硫化ナトリウム（Na2Ｓ）となつて回収され、パ
ルプ蒸解用薬剤として再利用される。 FIG. 1 is a system diagram showing the configuration of a first embodiment of the present invention. In the figure, reference numeral 10 denotes a recovery boiler, into which black liquor 11 is injected by an injection gun 12. This injected black liquor 11 is suspended and dried in the recovery boiler 10,
It lands on the bottom of the furnace to form a chamber bed 13.
A reduction reaction takes place in the high temperature atmosphere above the chamber bed 13, and the mirabilite in the jetted black liquor 11 is recovered as sodium sulfide (Na 2 S) and reused as a pulp cooking agent.
また、チヤーベツド１３の高温雰囲気によつて
燃焼された黒液の燃焼ガスは、図中矢印Ａで示す
如く上昇し、ボイラ１０内の種々の熱交換器１４
と熱交換して冷却された後、ボイラ１０外へ排出
される。そして、上記燃焼ガスはガス中の塵埃が
電気集塵器１５によつて集塵された後、煙突１６
から燃焼排ガスとして大気中に放出されるものと
なつている。 Further, the combustion gas of the black liquor combusted by the high-temperature atmosphere in the chamber bed 13 rises as shown by arrow A in the figure, and flows through the various heat exchangers 14 in the boiler 10.
After being cooled by exchanging heat with the boiler, it is discharged to the outside of the boiler 10. Then, after the dust in the gas is collected by the electric precipitator 15, the combustion gas is sent to the chimney 16.
It is now released into the atmosphere as combustion exhaust gas.
一方、第１図において１７はSO2濃度検出器で
あつて、上記燃焼排ガス中のSO2濃度を検出し、
このSO2濃度に応じた電気信号をSO2濃度信号Ｓ
１として不完全微分器１８に出力するものとなつ
ている。この不完全微分器１８は、SO2濃度信号
Ｓ１を不完全微分して不完全微分信号Ｓ２をリミ
ツタ１９に発信するものであり、すなわち、SO2
濃度が上昇時には正の不完全微分信号を発信し、
SO2濃度が下降時には負の不完全微分信号を発信
する。上記リミツタ１９は、上記不完全微分信号
Ｓ２が負の信号である場合にはカツトし、正の信
号で上限値以下である場合には入力レベルに比例
した出力を発信し、上限値を越えた場合には入力
レベルによらずに一定した出力を発信して、黒液
温度補正信号Ｓ３として加算器２０の一方の入力
端に供給するものであり、上記加算器２０の他方
の入力端には、噴射黒液温度設定器２１にて設定
された黒液温度設定値に応じて黒液温度設定信号
Ｓ４が供給される。そして、加算器２０におい
て、黒液温度設定信号Ｓ４に黒液温度補償信号Ｓ
３を加算することにより黒液温度設定値が補償さ
れ、黒液目標温度Ｔ１として黒液温度調節計２２
に出力されるものとなつている。 On the other hand, in FIG. 1, 17 is an SO 2 concentration detector, which detects the SO 2 concentration in the combustion exhaust gas,
The electrical signal corresponding to this SO 2 concentration is the SO 2 concentration signal S.
1 and is output to the incomplete differentiator 18. This incomplete differentiator 18 incompletely differentiates the SO 2 concentration signal S1 and sends an incompletely differentiated signal S2 to the limiter 19. In other words, the SO 2
When the concentration increases, it emits a positive incomplete differential signal,
When the SO 2 concentration decreases, a negative incomplete differential signal is transmitted. The limiter 19 cuts the incomplete differential signal S2 when it is a negative signal, and when it is a positive signal and is below the upper limit value, it outputs an output proportional to the input level, and when the signal exceeds the upper limit value, it outputs an output proportional to the input level. In this case, a constant output is transmitted regardless of the input level and supplied to one input terminal of the adder 20 as the black liquor temperature correction signal S3, and the other input terminal of the adder 20 is , a black liquor temperature setting signal S4 is supplied in accordance with the black liquor temperature setting value set by the injection black liquor temperature setting device 21. Then, in the adder 20, the black liquor temperature compensation signal S is added to the black liquor temperature setting signal S4.
By adding 3, the black liquor temperature set value is compensated, and the black liquor temperature controller 22 is set as the black liquor target temperature T1.
It is supposed to be output to .
また、噴射ガン１２に噴射黒液１１を供給する
噴射黒液供給ライン２３には上記噴射黒液１１の
温度を検出する黒液温度検出器２４が設けられて
おり、この黒液温度検出器２４にて検出された噴
射黒液温度Ｔ２は、前記黒液温度調節計２２に入
力される。そして、この黒液温度調節計２２にお
いて、噴射黒液温度Ｔ２が黒液目標温度Ｔ１に一
致するように、チツプ蒸解工程より排出される黒
液２５を加熱する黒液ヒータ２６の加熱量をフイ
ードバツク制御するものとなつている。 Further, the jet black liquor supply line 23 that supplies the jet black liquor 11 to the jet gun 12 is provided with a black liquor temperature detector 24 for detecting the temperature of the jet black liquor 11. The injected black liquor temperature T2 detected at is input to the black liquor temperature controller 22. The black liquor temperature controller 22 feeds back the heating amount of the black liquor heater 26 that heats the black liquor 25 discharged from the chip cooking process so that the injected black liquor temperature T2 matches the black liquor target temperature T1. It has become something to control.
このように構成された本装置においては、燃焼
排ガス中のSO2濃度がSO2濃度検出器１７によつ
て常時検出されており、このSO2濃度が下降する
と不完全微分演算器１８から負の不完全微分信号
Ｓ２が出力される。しかるに、この負の不完全微
分信号Ｓ２はリミツタ１９によつてカツトされる
ので、黒液温度補償信号Ｓ３は発信せず、噴射黒
液温度Ｔ２は変化しない。 In this device configured in this way, the SO 2 concentration in the combustion exhaust gas is constantly detected by the SO 2 concentration detector 17, and when this SO 2 concentration decreases, a negative value is output from the incomplete differential calculator 18. An incomplete differential signal S2 is output. However, since this negative incomplete differential signal S2 is cut off by the limiter 19, the black liquor temperature compensation signal S3 is not transmitted and the injected black liquor temperature T2 does not change.
一方、燃焼排ガス中のSO2濃度が上昇すると、
不完全微分演算器１８から正の不完全微分信号Ｓ
２が出力される。そうすると、この不完全微分信
号Ｓ２に応じてリミツタ１９から噴射黒液温度Ｔ
２を高めるような黒液温度補償信号Ｓ３が出力さ
れ、加算器２０にて噴射黒液温度設定信号Ｓ４に
加算されて黒液目標温度Ｔ１が演算される。そし
て、黒液温度調節計２２によつて噴射黒液温度Ｔ
２が黒液目標温度Ｔ１となるように黒液ヒータ２
６の加熱量が操作され、フイードバツク制御され
る。なお、噴射黒液温度Ｔ２は黒液２５の沸点よ
りも僅かに低い温度に保たれており、噴射黒液温
度Ｔ２が沸点以上となつてはならないので、リミ
ツタ１９によつて黒液温度補償量には上限が設け
られており、過大な補償が行なわれないようにな
つている。 On the other hand, when the SO 2 concentration in the combustion exhaust gas increases,
Positive incomplete differential signal S from the incomplete differential calculator 18
2 is output. Then, in response to this incomplete differential signal S2, the limiter 19 outputs the injection black liquor temperature T.
A black liquor temperature compensation signal S3 that raises the black liquor temperature T2 is outputted, and added to the injection black liquor temperature setting signal S4 in an adder 20 to calculate a black liquor target temperature T1. Then, the black liquor temperature controller 22 controls the injected black liquor temperature T.
Black liquor heater 2 so that temperature 2 becomes the black liquor target temperature T1.
The heating amount of No. 6 is manipulated and feedback controlled. Note that the jetted black liquor temperature T2 is maintained at a temperature slightly lower than the boiling point of the black liquor 25, and since the jetted black liquor temperature T2 must not exceed the boiling point, the black liquor temperature compensation amount is controlled by the limiter 19. An upper limit has been set on the amount to prevent excessive compensation.
ところで、噴射黒液温度Ｔ２と燃焼排ガス中の
SO2濃度との間には、第２図に示す如く過渡的に
は噴射黒液温度Ｔ２を上昇させるとSO2濃度が減
少する傾向がある。 By the way, the injection black liquor temperature T2 and the combustion exhaust gas
As shown in FIG. 2 , there is a tendency for the SO 2 concentration to decrease transiently as the injection black liquor temperature T2 is increased.
したがつて、本実施例によれば、燃焼排ガス中
のSO2濃度が上昇すると、噴射黒液温度設定値を
高めるような補償を行なつて黒液目標温度Ｔ１を
演算し、この黒液目標温度Ｔ１に噴射黒液温度Ｔ
２が一致するように黒液ヒータ２６を制御するこ
とにより噴射黒液１１の温度を上昇させるように
したので、第２図から明らかなように過渡的には
燃焼排ガス中のSO2濃度の上昇が抑制される。 Therefore, according to this embodiment, when the SO 2 concentration in the combustion exhaust gas increases, the black liquor target temperature T1 is calculated by performing compensation to increase the injection black liquor temperature set value, and this black liquor target temperature T1 is calculated. Injection black liquor temperature T at temperature T1
Since the temperature of the injected black liquor 11 is increased by controlling the black liquor heater 26 so that is suppressed.
かくして、黒液２５内に混入される芒硝の増加
等の外乱によつて燃焼排ガス中のSO2濃度が上昇
しても、速やかにこの上昇を抑制することができ
るので、公害物質であるSO2を常時規制値以下に
抑えられ、安定したボイラ操業を行なうことが可
能となる。 In this way, even if the SO 2 concentration in the combustion exhaust gas increases due to a disturbance such as an increase in mirabilite mixed into the black liquor 25, this increase can be quickly suppressed, so that the pollutant SO 2 can be suppressed. can be kept below the regulation value at all times, making it possible to perform stable boiler operation.
一方、噴射黒液温度とSO2濃度との間には長期
的には第４図に示す如くSO2濃度が最小となる噴
射黒液温度が存在することが判明している。そこ
で、公知のアルゴリズムである山登り法等を用い
て極値探索を行ない、最適な噴射黒液温度を見付
けてこれを保持し、SO2濃度を最小状態に保つよ
うにすることが可能である。 On the other hand, it has been found that, in the long term, there exists a jet black liquor temperature at which the SO 2 concentration is minimum, as shown in FIG. 4, between the jet black liquor temperature and the SO 2 concentration. Therefore, it is possible to search for extreme values using a well-known algorithm such as the hill-climbing method, to find and maintain the optimal injection black liquor temperature, and to keep the SO 2 concentration at a minimum state.
第３図はこの極値探索法を用いた本発明の第２
の実施例の構成を示す系統図である。本実施例が
前記第１の実施例と異なる点は、不完全微分演算
器１８とリミツタ１９との代わりに極値探索器３
０を設けた点であり、その他の部分は同様である
ので同一符号を付し、詳しい説明は省略する。 Figure 3 shows the second method of the present invention using this extreme value search method.
FIG. 2 is a system diagram showing the configuration of an embodiment. This embodiment differs from the first embodiment in that an extreme value searcher 3 is used instead of an incomplete differential calculator 18 and a limiter 19.
0 is provided, and other parts are the same, so the same reference numerals are given, and detailed explanation will be omitted.
上記極値探索器３０は、たとえば次の如く動作
する。すなわち、先ず、黒液温度検出器２４によ
つて検出された噴射黒液温度Ｔ２を取込み、この
黒液温度Ｔ２を所定温度ΔTだけ高めるような黒
液温度補償信号Ｓ３を加算器２０に出力する。そ
うすると、噴射黒液温度Ｔ２が所定温度ΔTだけ
上昇し、これによつてSO2濃度が変動する。この
とき、SO2濃度が減少したならば、再度、噴射黒
液温度Ｔ２を高めるような黒液温度補償信号Ｓ３
を出力し、逆にSO2濃度が上昇した場合には噴射
黒液温度Ｔ２を低めるような黒液温度補償信号Ｓ
３を出力する。そして、再度、SO2濃度の変動を
調べる。以下、この動作を繰返して山登り的に
SO2濃度が最小となる噴射黒液温度Ｔ２を見付
け、この値を保持するものとなつている。 The extreme value searcher 30 operates as follows, for example. That is, first, the injected black liquor temperature T2 detected by the black liquor temperature detector 24 is taken in, and a black liquor temperature compensation signal S3 is outputted to the adder 20 to increase the black liquor temperature T2 by a predetermined temperature ΔT. . Then, the injected black liquor temperature T2 increases by a predetermined temperature ΔT, thereby causing the SO 2 concentration to fluctuate. At this time, if the SO 2 concentration decreases, the black liquor temperature compensation signal S3 is sent again to increase the injected black liquor temperature T2.
On the other hand, if the SO 2 concentration increases, a black liquor temperature compensation signal S is output that lowers the injected black liquor temperature T2.
Outputs 3. Then, we examine the fluctuations in SO 2 concentration again. From now on, repeat this action like climbing a mountain.
The injection black liquor temperature T2 at which the SO 2 concentration is the minimum is found and this value is maintained.
このように、本実施例によれば、SO2濃度が最
小となる噴射黒液温度Ｔ２を山登り法によつて見
付け、この値を保持するようにしたので、燃焼排
ガス中に含まれるSO2濃度は常に最小な値となる
ように制御される。したがつて、SO2濃度を規制
値よりもかなり低いレベルに抑えることができる
ので、より安定したボイラ操業を行なうことがで
きる。また、外乱が入つたりプラント状況が変化
したりすると最適な噴射黒液温度が変化するが、
このような場合には再び極値探索を行なつてその
状況に応じた最適温度を求めることにより、常に
安定したSO2濃度制御が可能となる。 As described above, according to this embodiment, the injection black liquor temperature T2 at which the SO 2 concentration is minimum is found by the hill-climbing method, and this value is held, so that the SO 2 concentration contained in the combustion exhaust gas is is always controlled to be the minimum value. Therefore, since the SO 2 concentration can be suppressed to a level considerably lower than the regulatory value, more stable boiler operation can be performed. In addition, the optimal black liquor injection temperature changes when disturbances occur or plant conditions change.
In such a case, by performing the extreme value search again to find the optimal temperature according to the situation, stable SO 2 concentration control is always possible.
なお、本発明は前記各実施例に限定されるもの
ではない。たとえば前記実施例では噴射黒液温度
を所定の噴射黒液温度設定値となるように調節
し、この噴射黒液温度設定値をSO2濃度に応じて
制御する場合の例を用いて説明したが、直接的に
黒液温度をSO2濃度に応じて制御するように構成
してもよいことは言うまでもない。また、前記第
２の実施例では、極値探索器３０として山登り法
によりSO2濃度が最小となる噴射黒液温度Ｔ２を
見付ける場合を示したが、複数組の噴射黒液温度
Ｔ２とこれに対応するSO2濃度とのデータを求
め、これらデータから噴射黒液温度Ｔ２に対する
SO2濃度の関数を最小２乗法等によつて演算し、
その関数値（SO2濃度）を最小とする変数値（噴
射黒液温度）を求めて出力するようにしてもよ
い。また、前記第２の実施例では噴射黒液温度Ｔ
２を検出して極値探索を行なう場合を示したが、
噴射黒液温度設定器２１にて設定される噴射黒液
温度設定値を取込み、この設定値を基準として山
登り的にSO2濃度が最小となる噴射黒液温度Ｔ２
を求めるようにしてもよい。このほか本発明の要
旨を越えない範囲で種々変形実施可能であるのは
勿論である。 It should be noted that the present invention is not limited to the above embodiments. For example, in the above embodiment, the injection black liquor temperature is adjusted to a predetermined injection black liquor temperature setting value, and the injection black liquor temperature setting value is controlled according to the SO 2 concentration. It goes without saying that the black liquor temperature may be directly controlled in accordance with the SO 2 concentration. Furthermore, in the second embodiment, the extreme value searcher 30 uses a hill-climbing method to find the injected black liquor temperature T2 at which the SO 2 concentration is the minimum. Obtain the data with the corresponding SO 2 concentration, and from these data, calculate the injected black liquor temperature T2.
Calculate the function of SO 2 concentration by least squares method etc.
The variable value (injected black liquor temperature) that minimizes the function value (SO 2 concentration) may be determined and output. In addition, in the second embodiment, the injection black liquor temperature T
2 is detected and the extreme value search is performed, but
The injection black liquor temperature set value set by the injection black liquor temperature setting device 21 is taken in, and the injection black liquor temperature T2 is set at which the SO 2 concentration becomes the minimum in a hill-climbing manner based on this set value.
You may also ask for It goes without saying that various other modifications can be made without departing from the gist of the present invention.
以上詳述したように本発明は、回収ボイラ内に
噴射される黒液の温度を検出し、この検出された
黒液温度が所定の噴射黒液温度となるように調節
すると共に、前記回収ボイラの燃焼排ガス内の
SO2濃度を検知し、この検知されたSO2濃度に応
じて前記噴射黒液温度を制御するようにしたもの
である。
As described in detail above, the present invention detects the temperature of the black liquor injected into the recovery boiler, adjusts the detected black liquor temperature to a predetermined injection black liquor temperature, and controls the temperature of the black liquor injected into the recovery boiler. in the combustion exhaust gas of
The SO 2 concentration is detected and the temperature of the injected black liquor is controlled according to the detected SO 2 concentration.
したがつて、本発明によれば、SO2濃度の変動
に応じて黒液温度が変化し、SO2濃度の変動が抑
制されるので、回収ボイラから排出される燃焼排
ガス中に含まれるSO2濃度を高精度に制御でき、
SO2濃度が上昇した場合には速やかに抑制するこ
とが可能な回収ボイラのSO2濃度低減装置を提供
できる。 Therefore, according to the present invention, the black liquor temperature changes in accordance with fluctuations in the SO 2 concentration, and fluctuations in the SO 2 concentration are suppressed, so that the SO 2 contained in the combustion exhaust gas discharged from the recovery boiler is reduced. Concentration can be controlled with high precision,
It is possible to provide an SO 2 concentration reduction device for a recovery boiler that can quickly suppress an increase in SO 2 concentration.
第１図および第２図は本発明の一実施例を示す
図であつて、第１図は構成を示す系統図、第２図
は噴射黒液温度とSO2濃度との過渡的な状態にお
ける関係を示す図、第３図は本発明の第２の実施
例の構成を示す系統図、第４図は噴射黒液温度と
SO2濃度との長期的な状態における関係を示す図
である。
１０……回収ボイラ、１１……噴射黒液、１７
……SO2濃度検出器、１８……不完全微分演算
器、１９……リミツタ、２０……加算器、２１…
…噴射黒液温度設定器、２２……黒液温度調節
計、２４……黒液温度検出器、２５……黒液ヒー
タ、３０……極値探索器。
1 and 2 are diagrams showing one embodiment of the present invention, in which FIG. 1 is a system diagram showing the configuration, and FIG. 2 is a diagram showing a transient state of the injected black liquor temperature and SO 2 concentration. 3 is a system diagram showing the configuration of the second embodiment of the present invention, and FIG. 4 is a diagram showing the relationship between the injection black liquor temperature and
FIG. 3 is a diagram showing a long-term relationship with SO 2 concentration. 10...Recovery boiler, 11...Black liquor injection, 17
... SO 2 concentration detector, 18 ... incomplete differential calculator, 19 ... limiter, 20 ... adder, 21 ...
... Injection black liquor temperature setting device, 22 ... Black liquor temperature controller, 24 ... Black liquor temperature detector, 25 ... Black liquor heater, 30 ... Extreme value searcher.
Claims (1)
て蒸気を発生させると共にチツプ蒸解用薬剤原料
を回収する回収ボイラにおいて、前記回収ボイラ
内に噴射される黒液の温度を検出する黒液温度検
出手段と、前記回収ボイラの燃焼排ガス内のSO2
濃度を検知するSO2濃度検知手段と、このSO2濃
度検知手段にて検知されたSO2濃度に応じて前記
噴射黒液温度を制御する噴射黒液温度制御手段と
を具備したことを特徴とする回収ボイラのSO2濃
度低減装置。 ２ 前記噴射黒液温度制御手段は、SO2濃度が上
昇したときにその上昇を抑制するように前記噴射
黒液温度を変化させるようにしたものであること
を特徴とする特許請求の範囲第１項記載の回収ボ
イラのSO2濃度低減装置。 ３ 前記噴射黒液温度制御手段は、SO2濃度が最
小となるように前記噴射黒液温度を変化させるよ
うにしたものであることを特徴とする特許請求の
範囲第１項記載の回収ボイラのSO2濃度低減装
置。 ４ 前記噴射黒液温度制御手段は、極値探索法に
よつてSO2濃度が最小となるように前記噴射黒液
温度を変化させるようにしたものであることを特
徴とする特許請求の範囲第１項記載の回収ボイラ
のSO2濃度低減装置。[Scope of Claims] 1. In a recovery boiler that burns black liquor discharged from a chip cooking process to generate steam and recover chemical raw materials for chip cooking, the temperature of the black liquor injected into the recovery boiler is controlled. A black liquor temperature detection means for detecting SO 2 in the combustion exhaust gas of the recovery boiler.
It is characterized by comprising an SO 2 concentration detection means for detecting the concentration, and an injection black liquor temperature control means for controlling the injection black liquor temperature according to the SO 2 concentration detected by the SO 2 concentration detection means. SO 2 concentration reduction equipment for recovery boilers. 2. Claim 1, wherein the injected black liquor temperature control means is configured to change the injected black liquor temperature so as to suppress an increase in the SO 2 concentration when the concentration increases. SO 2 concentration reduction device for a recovery boiler as described in Section 2. 3. The recovery boiler according to claim 1, wherein the injected black liquor temperature control means is configured to change the injected black liquor temperature so that the SO 2 concentration is minimized. SO 2 concentration reduction device. 4. The jetted black liquor temperature control means is configured to change the jetted black liquor temperature using an extreme value search method so that the SO 2 concentration is minimized. The SO 2 concentration reduction device for a recovery boiler according to item 1.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16900385A JPS6229821A (en) | 1985-07-31 | 1985-07-31 | Device for reducing concentration of so2 of recovery boiler |
| US07/090,425 US4768469A (en) | 1985-07-31 | 1987-08-26 | Operation control apparatus for recovery boilers |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16900385A JPS6229821A (en) | 1985-07-31 | 1985-07-31 | Device for reducing concentration of so2 of recovery boiler |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6229821A JPS6229821A (en) | 1987-02-07 |
| JPH0480156B2 true JPH0480156B2 (en) | 1992-12-17 |
Family
ID=15878542
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16900385A Granted JPS6229821A (en) | 1985-07-31 | 1985-07-31 | Device for reducing concentration of so2 of recovery boiler |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6229821A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63243627A (en) * | 1987-03-28 | 1988-10-11 | Toshiba Corp | Injected black liquid particle size control system in heavy oil mixed firing recovery boiler |
-
1985
- 1985-07-31 JP JP16900385A patent/JPS6229821A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6229821A (en) | 1987-02-07 |
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