JPS6183391A - Concentration of black liquor - Google Patents
Concentration of black liquorInfo
- Publication number
- JPS6183391A JPS6183391A JP19950484A JP19950484A JPS6183391A JP S6183391 A JPS6183391 A JP S6183391A JP 19950484 A JP19950484 A JP 19950484A JP 19950484 A JP19950484 A JP 19950484A JP S6183391 A JPS6183391 A JP S6183391A
- Authority
- JP
- Japan
- Prior art keywords
- black liquor
- concentration
- viscosity
- concentrator
- direct contact
- 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
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Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、ノ９ルプ廃液である黒液な合理的に高濃度に
濃縮する方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for concentrating black liquor, which is waste liquid from No9lp, to a reasonably high concentration.
従来、ノ（ルプ廃液である黒液の処理として、これを濃
縮したのち回収ボイラにて燃焼してエネルギーを回収す
ることが行われていた。Conventionally, the treatment of black liquor, which is waste liquid from slag, has been to concentrate it and then burn it in a recovery boiler to recover energy.
このエネルギー回収では、黒液をできるだけ高濃度に濃
縮することが有利であるが、黒液の濃縮には、黒液の粘
度が高いために直接接触式の濃縮装置を用いることがで
きず、間接加熱型の多重効用蒸発装置が用いられていた
。In this energy recovery, it is advantageous to concentrate the black liquor to the highest concentration possible, but due to the high viscosity of black liquor, it is not possible to use a direct contact type concentrator, and indirect A heated multiple effect evaporator was used.
しかるに、多重効用蒸発装置による濃縮においても、高
濃度になる程黒液の粘度が高くなり、伝熱係数の低下、
スケールの付着、焼付は等によって効率が悪くなり、約
７０チ程度まで濃縮するのが限度であった。However, even in the case of concentration using a multi-effect evaporator, the higher the concentration, the higher the viscosity of the black liquor, the lower the heat transfer coefficient, and the higher the concentration.
Efficiency deteriorated due to scale adhesion, baking, etc., and the concentration was limited to about 70 cm.
本発明は、このような問題点を解決し、黒液の濃度を７
８〜９０％以上に濃縮することを容易にし、エネルギー
回収率を向上させようとするものである。The present invention solves these problems and reduces the concentration of black liquor to 7.
The purpose is to facilitate concentration of 8 to 90% or more and improve energy recovery rate.
− ３一
本発明は、濃縮缶内において黒液な蒸発濃縮する黒液濃
縮法において、前記濃縮缶内の圧力を大気圧以上の高圧
に保持し、黒液の沸点を上昇せしめて黒液を高温にし、
黒液粘度が蒸発操作を円滑に保つ許容限界粘度を超えな
いように保ちながら蒸発濃縮を行い、黒液濃度を７８チ
以上に濃縮することを特徴とするものである。-31 The present invention provides a black liquor concentration method in which black liquor is evaporated and concentrated in a concentrator, in which the pressure in the concentrator is maintained at a high pressure higher than atmospheric pressure, and the boiling point of the black liquor is raised to increase the black liquor. Bring to a high temperature;
This method is characterized in that evaporative concentration is carried out while keeping the viscosity of the black liquor so as not to exceed the permissible limit viscosity for keeping the evaporation operation smooth, and the black liquor is concentrated to a concentration of 78 cm or more.
本発明の一実施例を図面を参照しつつ説明すれば、第１
図においては、後述する多重効用蒸発装置で一次濃縮さ
れた濃度６０〜７０％程度の中濃度黒液ｌを予熱器２に
よって加熱し、濃縮缶３の上部より缶内へ供給する。濃
縮缶３内は、多孔板もしくは切り欠き板等４によって上
下に一段あるいは複数段に仕切られている。One embodiment of the present invention will be described with reference to the drawings.
In the figure, a medium-concentration black liquor l of about 60 to 70% concentration, which has been primarily concentrated in a multi-effect evaporator to be described later, is heated by a preheater 2 and fed into the can from the upper part of the concentrator 3. The inside of the concentrate can 3 is vertically divided into one or more stages by a perforated plate, a cutout plate, or the like 4.
一方、濃縮缶３内には下部から過熱蒸気５が吹き込まれ
、黒液は各段を流下する間に過熱蒸気と直接接触し、濃
縮される。このとき、黒液の粘度が高いと所定の蒸発濃
縮が行われなくなるから、濃縮缶３内の圧力を圧力調節
弁６によって大気圧以上に保持し、黒液の沸点を上昇さ
せて黒液を高温にし、黒液の粘度が蒸発操作を円滑に保
つ許容限界粘度を超えないように保ちながら蒸発濃縮を
行い、黒液濃度を７８〜９０％以上の高濃度にまで濃縮
し、この高濃度黒液７は取り出される。黒液の前記許容
限界粘度としては、例えば１０．０００ｃｐ程度を一つ
の目安とするのが便利である。また、過熱蒸気５は、黒
液から奪った水分によって飽和蒸気８となり、濃縮缶３
の上部より排出される。この排出された飽和蒸気８は、
図示しない多重効用蒸発装置における加熱源として有効
利用し、希黒液を６０〜７０％程度の中濃度黒液１に濃
縮するのが有利である。On the other hand, superheated steam 5 is blown into the concentrator 3 from the lower part, and while the black liquor flows down each stage, it comes into direct contact with the superheated steam and is concentrated. At this time, if the viscosity of the black liquor is high, the prescribed evaporation and concentration will not be carried out, so the pressure inside the concentrator 3 is maintained above atmospheric pressure by the pressure control valve 6, and the boiling point of the black liquor is raised. Evaporative concentration is carried out at a high temperature while maintaining the viscosity of the black liquor to not exceed the permissible limit viscosity that keeps the evaporation operation smooth, and the black liquor is concentrated to a high concentration of 78 to 90% or more. Liquid 7 is removed. It is convenient to set the permissible limit viscosity of the black liquor to, for example, about 10.000 cp. Also, the superheated steam 5 becomes saturated steam 8 due to the water taken from the black liquor, and the concentrator 3
is discharged from the top. This discharged saturated steam 8 is
It is advantageous to use it effectively as a heating source in a multi-effect evaporator (not shown) to concentrate the dilute black liquor to a medium concentration black liquor 1 of about 60 to 70%.
また、中濃度黒液１の過熱蒸気５との直接接触による蒸
発濃縮に際し、第２図に示す如く、濃縮缶３上部に設け
られたスプレーノズル９から、黒液を霧状もしくは滴状
に散布し、下部より供給された過熱蒸気６と直接接触す
るように構成することも可能である。In addition, when the medium concentration black liquor 1 is evaporated and concentrated by direct contact with the superheated steam 5, the black liquor is sprayed in a mist or droplet form from a spray nozzle 9 provided at the top of the concentrator 3, as shown in Fig. 2. However, it is also possible to configure it so that it comes into direct contact with the superheated steam 6 supplied from the bottom.
なお、濃縮缶３としては、前述した直接接触式が、伝熱
面が存在しないことからスケーリングの問題が発生せず
、かつ濃縮缶３内の内蔵物が少ないため、製作費用が低
減されるから有利であるが、必ずしも直接接触式に限ら
ず、間接加熱式を用いることもできる。As for the concentrate can 3, the above-mentioned direct contact type is preferable because there is no heat transfer surface, so there is no problem of scaling, and since there are few built-in contents in the concentrate can 3, the manufacturing cost is reduced. Advantageously, it is not necessarily limited to a direct contact type, but an indirect heating type can also be used.
黒液の粘性と液温との関係については、大気圧下での沸
点以上の温度域では液温か３０〜４０６Ｃ上昇する毎に
粘度は約督。となり、また総括伝熱形数Ｕ値は、粘度が
釉になると、１．５〜２倍となり、粘度が下がる程上昇
率が高い。したがって、液温か高くなるように缶内圧力
を高くすればＵ値は向上し、また低粘度化により所要動
力も軽減される。Regarding the relationship between black liquor viscosity and liquid temperature, in the temperature range above the boiling point under atmospheric pressure, the viscosity increases approximately every time the liquid temperature rises by 30 to 406 C. Moreover, the overall heat transfer type number U value becomes 1.5 to 2 times when the viscosity becomes glaze, and the rate of increase increases as the viscosity decreases. Therefore, if the pressure inside the can is increased to increase the liquid temperature, the U value will improve, and the required power will also be reduced by lowering the viscosity.
また、直接接触式濃縮も可能となり、設備費も低下する
。In addition, direct contact concentration is also possible, reducing equipment costs.
一例をあげると、８５ｑ６濃度のＫＰ黒液は、大気圧下
、液温１２５℃において、
粘度−２Ｏ０００−３００００ｃｐ で、直接接触式濃
縮は不可、
間接ｆｆｌ拌弐テｕ −２００〜３００ ｋａｐｌ、７
．、、 ｈ、、ｅｃであるが、
缶内圧力４ｋｇ％ｆＧ’ 液温１８０ ℃においては、
粘度＝７００〜ｓ ｏ ｏ ｃｐで、
直接接触式濃縮可能、
間接攪拌式Ｔ：Ｕ−７００〜８００ ｋｏ”／、（、
ｈ、、℃となり、粘度は下がり、Ｕ値も向上する。For example, KP black liquor with a concentration of 85q6 has a viscosity of -20000-30000 cp at atmospheric pressure and a liquid temperature of 125°C, and direct contact concentration is not possible.
．． , h,, ec, but at an internal pressure of 4 kg%fG' and a liquid temperature of 180 ℃,
Viscosity = 700~s o cp, direct contact type concentration possible, indirect stirring type T: U-700~800 ko''/, (,
h, °C, the viscosity decreases, and the U value also improves.
したがって、缶内圧力を大気圧以上に保持して液温を高
めて黒液の粘度を低くすれば、直接接触式でも間接加熱
式でも有利に濃縮することができる。Therefore, if the pressure inside the can is maintained above atmospheric pressure and the temperature of the liquid is raised to lower the viscosity of the black liquor, it is possible to advantageously concentrate the black liquor by either the direct contact method or the indirect heating method.
以上述べたように、本発明は、黒液を濃縮缶内にて蒸発
濃縮するに際し、缶内圧力を大気圧以上に保って液温を
高め、黒液の粘度を低下させつつ濃縮するものであるか
ら、黒液の濃縮効率が高まり、高濃度に濃縮することを
容易にし、エネルギー回収率も高まり、所要動力も低減
されるというきわめて有益なる効果を有するものである
。As described above, the present invention, when evaporating and concentrating black liquor in a concentrating can, maintains the pressure inside the can above atmospheric pressure, increases the liquid temperature, and concentrates the black liquor while reducing its viscosity. This has the extremely beneficial effects of increasing the black liquor concentration efficiency, making it easier to concentrate to a high concentration, increasing the energy recovery rate, and reducing the required power.
第１図は本発明の一実施例を示す説明図で、第２図は本
発明の他の実施例を示す説明図である。
１・・・・・・中濃度黒液、 ２・・・・・・予熱器
、 ３・・・・・・濃縮缶、 ４・・・・・・多孔
板もしくは切り欠き板等、 ５・・・・・・過熱蒸気
、 ６・・・・・・圧力調節弁、７・・・・・・高濃
度黒液、 ８・・・・・・飽和蒸気、 ９・・・・
・・スプレーノズル。
特許出願人 株式会社荏原製作所
代理人 弁理士 高 木 正 行代理人 弁理
士 依 １）孝 次 部手続補正書 籍FIG. 1 is an explanatory diagram showing one embodiment of the invention, and FIG. 2 is an explanatory diagram showing another embodiment of the invention. 1... Medium concentration black liquor, 2... Preheater, 3... Concentrator can, 4... Perforated plate or cutout plate, etc., 5... ...Superheated steam, 6...Pressure control valve, 7...High concentration black liquor, 8...Saturated steam, 9...
··spray nozzle. Patent Applicant Ebara Corporation Agent Patent Attorney Masayuki Takagi Agent Patent Attorney Yori 1) Takatsugu Department Procedure Amendment Book
Claims (1)
、前記濃縮缶内の圧力を大気圧以上の高圧に保持し、黒
液の沸点を上昇せしめて黒液を高温にし、黒液粘度が蒸
発操作を円滑に保つ許容限界粘度を超えないように保ち
ながら蒸発濃縮を行い、黒液濃度を７８％以上に濃縮す
ることを特徴とする黒液濃縮方法。 ２、前記濃縮缶として黒液と水蒸気とを直接接触させる
直接接触式濃縮缶を使用するものである特許請求の範囲
第１項記載の黒液濃縮方法。[Claims] 1. In a black liquor concentration method in which black liquor is evaporated and concentrated in a concentrator, the pressure in the concentrator is maintained at a high pressure higher than atmospheric pressure to raise the boiling point of the black liquor. A method for concentrating black liquor, which is characterized in that the viscosity of the black liquor is heated to a high temperature and evaporative concentration is carried out while maintaining the viscosity of the black liquor so as not to exceed the permissible limit viscosity that keeps the evaporation operation smooth, thereby concentrating the black liquor to a concentration of 78% or more. 2. The method for concentrating black liquor according to claim 1, wherein a direct contact type concentrator is used as the concentrator, in which black liquor and steam are brought into direct contact.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19950484A JPS6183391A (en) | 1984-09-26 | 1984-09-26 | Concentration of black liquor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19950484A JPS6183391A (en) | 1984-09-26 | 1984-09-26 | Concentration of black liquor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6183391A true JPS6183391A (en) | 1986-04-26 |
Family
ID=16408917
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19950484A Pending JPS6183391A (en) | 1984-09-26 | 1984-09-26 | Concentration of black liquor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6183391A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63502674A (en) * | 1985-11-29 | 1988-10-06 | エ−．ア−ルストロム コ−ポレ−シヨン | How to reduce black liquor viscosity |
-
1984
- 1984-09-26 JP JP19950484A patent/JPS6183391A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63502674A (en) * | 1985-11-29 | 1988-10-06 | エ−．ア−ルストロム コ−ポレ−シヨン | How to reduce black liquor viscosity |
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