JPS63194800A - Process for controlling evaporation load of steam dryer - Google Patents
Process for controlling evaporation load of steam dryerInfo
- Publication number
- JPS63194800A JPS63194800A JP62025308A JP2530887A JPS63194800A JP S63194800 A JPS63194800 A JP S63194800A JP 62025308 A JP62025308 A JP 62025308A JP 2530887 A JP2530887 A JP 2530887A JP S63194800 A JPS63194800 A JP S63194800A
- Authority
- JP
- Japan
- Prior art keywords
- dryer
- steam
- water content
- drain
- dried
- 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.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims description 9
- 238000001704 evaporation Methods 0.000 title abstract description 16
- 230000008020 evaporation Effects 0.000 title abstract description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 29
- 239000000463 material Substances 0.000 claims abstract description 17
- 239000007788 liquid Substances 0.000 claims abstract description 5
- 230000001105 regulatory effect Effects 0.000 claims description 9
- 238000010438 heat treatment Methods 0.000 claims description 4
- 238000001035 drying Methods 0.000 abstract description 6
- 238000005303 weighing Methods 0.000 abstract 4
- 239000010802 sludge Substances 0.000 description 28
- 230000001276 controlling effect Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000004043 responsiveness Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は蒸気式乾燥機で汚泥等の被乾燥物の水分を間接
加熱して乾燥させる際、蒸発負荷を制御して乾燥機出口
側の乾燥物に含有する水分量を調節する蒸気式乾燥機の
蒸発負荷制御方法に関する。Detailed Description of the Invention (Industrial Field of Application) The present invention is designed to control the evaporation load when drying moisture in a material to be dried, such as sludge, by indirect heating in a steam dryer. The present invention relates to an evaporation load control method for a steam dryer that adjusts the amount of moisture contained in dried material.
従来の間接加熱型蒸気式乾燥機においては、乾燥機に供
給された例えば汚泥をボイラから供給される蒸気により
間接加熱し、乾燥機出口側ラインに設けられたドレント
ラップ等に乾燥機内で凝縮したドレンを排出させていた
。しかし、このように汚泥を蒸気により間接加熱するだ
けでは乾燥機に供給される蒸気量が同じ状態で伝熱面積
が一定であれば、蒸発量は一定となり、乾燥機出口側の
汚泥含水量の制御を行なうことができない。In conventional indirect heating steam dryers, for example, sludge supplied to the dryer is indirectly heated by steam supplied from a boiler, and condensed inside the dryer in a drain trap installed on the dryer outlet line. The drain was being discharged. However, if the sludge is only indirectly heated with steam in this way, if the amount of steam supplied to the dryer is the same and the heat transfer area is constant, the amount of evaporation will be constant and the water content of the sludge at the dryer outlet will decrease. cannot be controlled.
そこで、従来ではこの汚泥含水量を調節する目的で汚泥
の乾燥機内滞留量を減らしたりすることが試みられてい
るが、応答性、操作性等の点で問題があり、未だ実用化
に至っていない。Therefore, attempts have been made to reduce the amount of sludge retained in the dryer in order to adjust the water content of the sludge, but there are problems with responsiveness, operability, etc., and this has not yet been put to practical use. .
また、実際に汚泥の含水量を調節する場合、汚泥の含水
率を連続的に測定できる装置が必要になり、従来このよ
うな装置の検討が種々なされていたが、実用化の域に達
していなかった。しかし、最近では含水率を連続的に測
定可能な信頼度の高い連続水分測定器が開発されてきて
いる。In addition, when actually adjusting the water content of sludge, a device that can continuously measure the water content of sludge is required, and although various studies have been made on such devices, none have reached the stage of practical application. There wasn't. However, recently, highly reliable continuous moisture measuring instruments that can continuously measure moisture content have been developed.
本発明は蒸気式乾燥機出口側の乾燥物に含有する水分量
の制御、つまり蒸発負荷制御を可能にして、乾燥機出口
側の乾燥物の含有水分量を調節することができる蒸気式
乾燥機の蒸発負荷制御方法を提供することを目的とする
。The present invention is a steam dryer that is capable of controlling the amount of moisture contained in the dried material on the outlet side of the steam dryer, that is, it is possible to control the evaporation load, thereby adjusting the amount of moisture contained in the dried material on the outlet side of the dryer. The purpose of this invention is to provide a method for controlling evaporation load.
Ｃ問題点を解決するための手段〕
本発明は上記問題点を解決するために、次のような手段
を採っている。すなわち、乾燥機の蒸気入口側に圧力調
整弁を設け、乾燥機のドレン出口側にドレンポットを設
けると共にそのドレン排出ラインにドレンポットの液位
を制御するドレン水１つ講か弁を設け、さらに乾燥機の
乾燥物出口側に乾燥物の排出量を連続的に計量する計量
器及び含有水分を連続的に計測する水分測定器とをそれ
ぞれ設けて、前記計量器及び水分測定器により前記乾燥
機出口側の乾燥物に含有する水分量を測定し、この水分
量を制御要素として目標値をもとに前記圧力調節弁の開
度を調節することにより、蒸発負荷制御を行なうことを
特徴としている。Means for Solving Problem C] In order to solve the above problems, the present invention takes the following measures. That is, a pressure regulating valve is provided on the steam inlet side of the dryer, a drain pot is provided on the drain outlet side of the dryer, and a drain water valve for controlling the liquid level in the drain pot is provided in the drain discharge line. Further, a measuring device for continuously measuring the discharge amount of the dried material and a moisture measuring device for continuously measuring the contained moisture are provided on the dried material outlet side of the dryer, and the drying is performed by the measuring device and the moisture measuring device. Evaporation load control is performed by measuring the amount of moisture contained in the dried material on the machine outlet side and using this amount of moisture as a control element to adjust the opening degree of the pressure regulating valve based on a target value. There is.
従って、このような蒸気式乾燥機の蒸発負荷制御方法に
あっては、計量器及び水分測定器により測定された乾燥
機出口側の乾燥物に含有する水分量を制御要素として目
標値をもとに圧力調節弁の開度が調節されると、乾燥機
伝熱面の温度制御が行なわれると共に供給熱量も制御さ
れるので、乾燥機出口側の水分を一定にすることができ
、乾燥物に含有する水分の均一化を図ることが可能とな
る。Therefore, in such a method of controlling the evaporation load of a steam dryer, the target value is based on the amount of moisture contained in the dried material at the outlet of the dryer, which is measured by a measuring instrument and a moisture measuring device, as a control element. When the opening degree of the pressure control valve is adjusted, the temperature of the heat transfer surface of the dryer is controlled and the amount of heat supplied is also controlled, so the moisture content on the dryer outlet side can be kept constant and the drying material It becomes possible to equalize the water content.
以下本発明の一実施例を図面を参照して説明する。 An embodiment of the present invention will be described below with reference to the drawings.
第１図は本発明による蒸気乾燥機の蒸発負荷制御方法を
説明するための系統構成例を示すものである。第１図に
おいて、１は汚泥を蒸気により間接加熱して含有水分を
除去する乾燥機で、この乾燥機１にはボイラ２から蒸気
が供給されるようになっており、この蒸気供給ラインに
圧力調節弁３が設けられている。また、４は乾燥機１内
で凝縮したドレン水の排出ラインに設けられたドレンポ
ットで、このドレンポット４は乾燥機１から排出される
ドレンを収容し、その液位が常に一定になるようにドレ
ンポット４の排出ラインに設けられたドレン水位調節弁
５を開閉制御するものである。FIG. 1 shows an example of a system configuration for explaining the evaporation load control method for a steam dryer according to the present invention. In Figure 1, 1 is a dryer that indirectly heats sludge with steam to remove the moisture contained in it. Steam is supplied to this dryer 1 from a boiler 2, and pressure is applied to this steam supply line. A regulating valve 3 is provided. Further, 4 is a drain pot installed in the drain line of the condensed water condensed in the dryer 1. This drain pot 4 accommodates the drain discharged from the dryer 1, and keeps the liquid level constant at all times. It controls the opening and closing of the drain water level control valve 5 provided in the discharge line of the drain pot 4.
また、６及び７は乾燥機１で乾燥した汚泥の排出ライン
にそれぞれ設けられた計量器及び水分測定器で、計量器
６は乾燥汚泥の排出量を連続的に計量するものであり、
水分測定器７は乾燥汚泥の含有水分を連続的に計測する
ものである。一方、８はこれら計量器６及び水分測定器
７で測定された乾燥機１の乾燥汚泥に含有する水分量を
圧力調節弁３の制御要素として目標値をもとに弁開度を
求める演算器で、この演算器８で求められた弁開度制御
信号を圧力調節弁３に与えてボイラ２から乾燥機１へ供
給される蒸気圧力を制御するものである。Further, 6 and 7 are a measuring instrument and a moisture measuring instrument respectively installed in the discharge line of the sludge dried in the dryer 1, and the measuring instrument 6 continuously measures the discharge amount of the dried sludge.
The moisture measuring device 7 continuously measures the moisture content of the dried sludge. On the other hand, reference numeral 8 is a computing device that calculates the valve opening degree based on the target value, using the amount of water contained in the dried sludge in the dryer 1 as a control element for the pressure regulating valve 3, which is measured by the measuring device 6 and the moisture measuring device 7. The valve opening degree control signal obtained by this calculator 8 is given to the pressure regulating valve 3 to control the steam pressure supplied from the boiler 2 to the dryer 1.
次に上記のような系統構成による蒸気式乾燥機の蒸発負
荷制御方法について述べる。いま、乾燥機１に汚泥が収
容されている状態でボイラ２から乾燥機１に加熱源であ
る蒸気が蒸気圧力調節弁３を介して供給されているもの
とする。このような状態にあっては乾燥機１内で汚泥が
間接加熱されて乾燥し、そのとき凝縮したドレンは乾燥
ｍ１のドレン排出口からドレンポット４に排出される。Next, a method for controlling the evaporation load of a steam dryer using the system configuration described above will be described. It is now assumed that steam, which is a heating source, is being supplied from the boiler 2 to the dryer 1 via the steam pressure control valve 3 while the dryer 1 contains sludge. In such a state, the sludge is indirectly heated and dried in the dryer 1, and the condensed drain is discharged into the drain pot 4 from the drain outlet of the dryer m1.
このドレンポット４に溜ったドレン水はその液位が常に
一定値になるようにドレン水位調節弁５が制御される。A drain water level control valve 5 is controlled so that the liquid level of the drain water accumulated in the drain pot 4 is always at a constant value.
また、乾燥機１の汚泥出口から乾燥汚泥が排出され、こ
のとき排出ラインに設けられた計量器６及び水分測定器
７により乾燥汚泥示とその中に含有する水分が連続的に
計測され、その計測値がそれぞれ演算器８に入力される
。この演算器８ではこれら計量器６及び水分測定Ｂ７で
測定された乾燥機１出口の乾燥汚泥に含有する水分量を
圧力調節弁３の！！ｌ ｔ［ｌ要素として設定器９から
入力される目標値をもとに弁開度を求め、この間面制御
信号を圧力調節弁３に与えてボイラ２から乾燥機１へ供
給される蒸気圧力を制御する。つまり、計量器６及び水
分測定器７により計量された乾燥機出口側の乾燥汚泥に
含有する水分量を圧力調節弁３の制御要素として乾燥汚
泥の含有水分目標値をもとに乾燥機１の入口蒸気圧力を
制御するいわゆるカスケード制御により、乾燥機伝熱面
の温度と供給熱量とが制御されて蒸発負荷制御を行なう
ことが可能となる。なお、演算器８の目標値として炉温
等を入力することが考えられ、この場合には乾燥機出口
側の乾燥汚泥に含有する全水分量と炉温等が蒸気圧力調
節弁３の制御要素となる。In addition, dried sludge is discharged from the sludge outlet of the dryer 1, and at this time, the dry sludge and the moisture contained therein are continuously measured by a measuring device 6 and a moisture measuring device 7 installed in the discharge line. Each measured value is input to the calculator 8. This calculator 8 calculates the amount of water contained in the dried sludge at the outlet of the dryer 1, which is measured by the measuring device 6 and the water measuring device B7. ! The valve opening degree is determined based on the target value input from the setting device 9 as the l t [l element, and this control signal is given to the pressure regulating valve 3 to adjust the steam pressure supplied from the boiler 2 to the dryer 1. Control. In other words, the amount of moisture contained in the dried sludge on the dryer outlet side measured by the meter 6 and the moisture measuring device 7 is used as a control element for the pressure regulating valve 3, and the dryer 1 is controlled based on the target moisture content of the dried sludge. By so-called cascade control that controls the inlet steam pressure, the temperature of the dryer heat transfer surface and the amount of heat supplied are controlled, making it possible to control the evaporation load. Note that it is possible to input the furnace temperature, etc. as the target value of the calculator 8, and in this case, the total water content contained in the dried sludge on the dryer outlet side, the furnace temperature, etc. are the control elements of the steam pressure regulating valve 3. becomes.
このようにして乾燥機１の蒸発負荷制御を可能とするこ
とにより、例えば乾燥−焼却プロセスにおいて、焼却炉
の炉温の制御が可能となる。また、汚泥の含有水分及び
供給量が乾燥機１に入る前に変動することが有り得るが
、前述したような蒸発負荷制御を行なうことにより、乾
燥ＦＭ１の汚泥出口側の水分を一定にすることができ、
乾燥汚泥の含有水分の均一化を図ることができる。した
がつて、乾燥設備以降の設備１例えば焼却設備等の安定
運転に大きく寄与できる。By making it possible to control the evaporation load of the dryer 1 in this manner, it becomes possible to control the furnace temperature of the incinerator in, for example, a drying-incineration process. Furthermore, although the water content and supply amount of sludge may fluctuate before it enters the dryer 1, by controlling the evaporation load as described above, it is possible to keep the water content on the sludge outlet side of the drying FM 1 constant. I can do it,
It is possible to equalize the moisture content of dried sludge. Therefore, it can greatly contribute to the stable operation of the equipment 1 after the drying equipment, such as the incineration equipment.
第２図は本発明の他の実施例を示すもので、第１図の系
統構成に対して更に乾燥機１に汚泥を供給する汚泥供給
ポンプ１０の出口側に前述同様の計量器６′と水分測定
器７′とを設け、これら計量器６−と水分測定器７′に
より乾燥機１に供給される汚泥の全水分量を計量し、こ
れを前述した乾燥機１の出口側の乾燥汚泥に含有する水
分量と共に圧力制御弁３の制御要素として演算器８に入
力することにより、更に蒸発負荷制−を厳密に行なうこ
とができる。FIG. 2 shows another embodiment of the present invention, in which, in addition to the system configuration shown in FIG. A moisture measuring device 7' is provided, and the total moisture content of the sludge supplied to the dryer 1 is measured by the measuring device 6- and the moisture measuring device 7'. By inputting the amount of water contained in the water into the computing unit 8 as a control element for the pressure control valve 3, the evaporation load can be controlled more precisely.
なお、上記各実施例では乾燥機により汚泥を被乾燥物と
して水分を除去する場合について述べたが、本発明は水
分を含有する他の被乾燥物であってもよいことは勿論で
ある。In each of the above embodiments, a case has been described in which water is removed from sludge as a material to be dried using a dryer, but it goes without saying that the present invention may be applied to other materials to be dried that contain water.
以上述べたように本発明によれば、蒸気式乾燥機出口側
の乾燥物に含有する水分量の制御、つまり蒸気負荷制御
を可能にしたので、乾燥機出口側の水分を一定にするこ
とができ、乾燥物に含有する水分の均一化を図ることが
できる蒸気式乾燥機の蒸発負荷制御方法を提供すること
ができる。As described above, according to the present invention, it is possible to control the amount of moisture contained in the dried material on the outlet side of the steam dryer, that is, to control the steam load, so it is possible to keep the moisture content on the outlet side of the dryer constant. Accordingly, it is possible to provide a method for controlling evaporation load of a steam dryer, which can achieve uniformity of moisture contained in dried material.
第１図は本発明の一実施例を示す蒸気式乾燥機の制御系
統構成図、第２図は本発明の他の実施例を示す蒸気式乾
燥機の制御系統構成図である。
１・・・・・・乾燥機、２・・・・・・ボイラ、３・・
・・・・圧力調節弁、４・・・・・・ドレンボット、５
・・・・・・ドレン水位調節弁、６・・・・・・計量器
、７・・・・・・水分測定器、８・・・・・・演算器、
９・・・・・・設定器、１０・・・・・・汚泥供給ポン
プ。FIG. 1 is a control system block diagram of a steam dryer showing one embodiment of the present invention, and FIG. 2 is a control system block diagram of a steam dryer showing another embodiment of the present invention. 1...Dryer, 2...Boiler, 3...
...Pressure control valve, 4...Drain bot, 5
... Drain water level control valve, 6 ... Measuring instrument, 7 ... Moisture measuring device, 8 ... Arithmetic unit,
9...Setting device, 10...Sludge supply pump.
Claims (1)
燥機において、乾燥機の蒸気入口側に設けられた圧力調
節弁と、乾燥機のドレン出口側に設けられたドレンポッ
トと、該ドレンポットの排出ラインに設けられドレンポ
ットの液位を制御するドレン水位調節弁と、乾燥機の乾
燥物出口側にそれぞれ設けられ乾燥物の排出量を連続的
に計量する計量器及び含有水分を連続的に計測する水分
測定器とを備え、前記計量器及び水分測定器により前記
乾燥機出口側の乾燥物に含有する水分量を測定し、この
水分量を制御要素として目標値をもとに前記圧力調節弁
の開度を調節することにより、蒸発負荷制御を行なうこ
とを特徴とする蒸気式乾燥機の蒸発負荷制御方法。A steam dryer that dries a material to be dried by indirect heating with steam, comprising: a pressure regulating valve provided on the steam inlet side of the dryer; a drain pot provided on the drain outlet side of the dryer; and the drain pot. A drain water level control valve is installed in the discharge line of the dryer to control the liquid level in the drain pot, and a measuring device is installed on the dried material outlet side of the dryer to continuously measure the amount of dried material discharged. and a moisture measuring device that measures the moisture content at the outlet side of the dryer. An evaporative load control method for a steam dryer, characterized in that the evaporative load is controlled by adjusting the opening degree of a control valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62025308A JPH0757359B2 (en) | 1987-02-05 | 1987-02-05 | Evaporative load control method for steam dryer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62025308A JPH0757359B2 (en) | 1987-02-05 | 1987-02-05 | Evaporative load control method for steam dryer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63194800A true JPS63194800A (en) | 1988-08-11 |
| JPH0757359B2 JPH0757359B2 (en) | 1995-06-21 |
Family
ID=12162377
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62025308A Expired - Lifetime JPH0757359B2 (en) | 1987-02-05 | 1987-02-05 | Evaporative load control method for steam dryer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0757359B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102628644A (en) * | 2011-02-07 | 2012-08-08 | 三菱重工环境·化学工程株式会社 | Evaporation load control system of drying machine |
| JP2020139654A (en) * | 2019-02-27 | 2020-09-03 | 株式会社Ihi | Dryer, and drying method |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61256180A (en) * | 1985-05-09 | 1986-11-13 | 川崎製鉄株式会社 | Method of controlling powdered and granular body drier |
-
1987
- 1987-02-05 JP JP62025308A patent/JPH0757359B2/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61256180A (en) * | 1985-05-09 | 1986-11-13 | 川崎製鉄株式会社 | Method of controlling powdered and granular body drier |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102628644A (en) * | 2011-02-07 | 2012-08-08 | 三菱重工环境·化学工程株式会社 | Evaporation load control system of drying machine |
| JP2012163257A (en) * | 2011-02-07 | 2012-08-30 | Mitsubishi Heavy Industries Environmental & Chemical Engineering Co Ltd | Evaporation load control system of dryer |
| CN102628644B (en) * | 2011-02-07 | 2015-05-27 | 三菱重工环境·化学工程株式会社 | Evaporation load control system of drying machine |
| JP2020139654A (en) * | 2019-02-27 | 2020-09-03 | 株式会社Ihi | Dryer, and drying method |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0757359B2 (en) | 1995-06-21 |
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