JPH0454246B2 - - Google Patents
Info
- Publication number
- JPH0454246B2 JPH0454246B2 JP57039929A JP3992982A JPH0454246B2 JP H0454246 B2 JPH0454246 B2 JP H0454246B2 JP 57039929 A JP57039929 A JP 57039929A JP 3992982 A JP3992982 A JP 3992982A JP H0454246 B2 JPH0454246 B2 JP H0454246B2
- Authority
- JP
- Japan
- Prior art keywords
- flow rate
- mixed fuel
- temperature
- valve
- control valve
- 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 - Lifetime
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Classifications
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D7/00—Control of flow
- G05D7/06—Control of flow characterised by the use of electric means
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Blast Furnaces (AREA)
- Flow Control (AREA)
- Control Of Temperature (AREA)
- Manufacture Of Iron (AREA)
Description
本発明は管内を通流する石炭・重油混合燃料、
石炭・タール混合燃料等の高粘性スラリー状の混
合燃料の流量を制御する方法に関する。
曽て高炉で使用する燃料はコークスだけであつ
たが、高炉技術の発展により羽口から高炉内へ補
助燃料として重油が吹き込まれるようになり、更
に最近のエネルギ事情を反映して上記重油に替え
て石炭・重油混合燃料（以下COMという）が吹
き込まれるようになり、更には石炭・タール混合
燃料（以下CTMという）を吹き込むことが検討
されている。
従つてCOM、CTM等の高粘性スラリー状の流
体の優れた流量制御方法の開発が待望されてい
る。斯かる流体の流量制御方法としては、一般に
管に設けた流量調節弁の弁開度を調節することに
より制御する方法が用いられるが、この方法によ
る場合は流量調節を有効に行い得る流量調節弁開
度が限定されているという問題点がある。
第１図はその制御特性を、横軸に流量調節弁開
度をとり、縦軸に流量をとつて示したものである
が、流量調節弁開度が25〜50％のときは、流量調
節弁開度をわずかに変化させるだけで流量調節量
を大きく変化させ得るが、50％を超えると流量調
節弁開度を相当変化させても流量調節量は殆ど変
化しないことが分かる。
また流量調節弁開度が25％以下の状態でCOM、
CTM等の流体流量を制御することきは、流量調
節弁が摩耗したり流量調節弁に燃料が詰まつたり
するので、流量調節弁開度を25％以下にすること
は避けた方がよい。
またCOM、CTM等の流体は温度依存性のある
高粘度流体であるので、管内を通流する流体の温
度をその管に付設した加熱器により調節して流量
制御を行う方法も考えられるが、この方法は応答
性が悪いという難点がある。
これに対して本願出願人は管に設けた流量調節
弁の弁開度調節量及び／又は管に設けた加熱器の
温度調節量を調整することにより流体流量を制御
する方法（特願昭56−213836号）を提案し、その
制御性及び応答性の向上を図つた。
この方法において、弁開度調節量及び温度調節
量を上下限設定しつつ調整することにより、管内
を通流するCOMの流量を、350／時を目標値と
して制御した結果の一例を第２図に示した。
即ち第２図は横軸に時間をとり、縦軸に流量、
弁開度及び温度をとり、これらの経時的変化（流
量：実線、弁開度：一転鎖線、温度：二点鎖線）
を示したものである。図に示す第一の時間帯Ａに
おいては、流量調節弁の弁開度及び加熱器の温度
調節量の両方を調整することにより適正な流量制
御がなされているが、流量が急激に増加した第二
の時間帯Ｂにおいては、流量調節弁の弁開度が流
量調節弁の摩耗、燃料の詰まり等の防止のために
設定した下限弁開度（30％）に達しているために
加熱器の温度調節量のみによる制御がなされてい
る。
従つて前述した如く応答性の悪い加熱器の温度
調節量のみによる制御では流量をその目標値に至
らせるのに相当の応答時間が必要であることが分
かる（この場合30分程度必要であつた）。
更にそれに続く第三の時間帯Ｃにおいては流量
調節弁はその下限弁開度に近い状態にて制御され
ており、この状態から流量が急激に増加すると第
二の時間帯Ｂと同様の状況となり、制御の応答性
が若干問題となる。
本発明は斯かる事情に鑑みてなされたものであ
り、管内を通流するCOM、CTM等の高粘質スラ
リー状の固液混合燃料の流量を制御する場合に、
制御性、応答性ともに優れ、流量制御器の損傷、
燃料の詰まり等が生じない流量制御方法を提供す
ることを目的とする。
本発明に係る混合燃料の流量制御方法は、管内
を通流する固液混合燃料の流量を管に設けた流量
調節弁の弁開度により制御する方法において、流
量調節弁よりも上流側の固液混合燃料通流域に温
度調節手段を、また流量調節弁よりも下流側に流
量計を夫々設け、前記流量調節弁の開閉による適
正な制御が可能な流量調節の範囲内に目標値を設
定し、前記流量計による検出値を前記目標値に一
致させるべく前記温度調節手段により固液混合燃
料の温度を調節することを特徴とする。
以下本発明方法をその実施例に基づいて説明す
る。第３図は本発明方法の実施状態を示す模式図
である。枝管ｉは本管（図示せず）が分岐されて
高炉羽口（図示せず）へ導かれている枝管のうち
の１つであり、その中途には、枝管ｉ内を通流す
る混合燃料（COM）の流量を調節する流量調節
弁１及びその混合燃料の流量を実測する流量計２
が取付られている。
また枝管ｉには加熱器３が付設されており、該
加熱器３には枝管ｉ内を通流する混合燃料の温度
を調節すべく、蒸気が蒸気弁４にて調節されて供
給されるようになつている。
更に流量調節弁１には弁開度計５が付設されて
おり、流量調節弁１の弁開度を実測するようにな
つており、また加熱器３の近傍の枝管ｉには温度
計６が取り付けられており、加熱器３により加熱
された枝管ｉ内混合燃料の温度を実測するように
なつている。
流量計２にて実測された枝管ｉを通流する混合
燃料の流量F1に関する信号は平均流量算出回路
１１へ入力されるが、該平均流量算出回路１１へ
は、他の枝管（図示せず）内を通流する混合燃料
の流量に関する信号も入力され、下記(1)式による
平均流量Fが算出されるようになつている。F
＝N
〓i=1
Fi／Ｎ ……(1)
但し、
Ｎ：枝管の本数（例えば38本）
次に弁開度変更量換算回路１２へは、上述のよ
うにして算出された平均流量Fに関する信号と
共に枝管ｉ内を通流する混合燃料の流量Fiに関す
る信号も入力される。
そして弁開度変更量換算回路１２は両者を比較
し、その結果を用いて下記(2)式による換算を行
い、枝管ｉに取り付けられた流量調節弁１の開度
変更量Zsviを算出する。
Zsvi＝fi（Fi−F） ……(2)
そしてこの開度変更量Zsviに関する信号は、流
量調節弁１に対応させて設けてある上下限設定器
１３へ入力され、該上下限設定器１３に設定して
ある条件を満足するときは流量調節弁１に対応さ
せて設けてある弁開度調節器１４へ入力され、そ
れに基づいて弁開度調節器１４が流量調節弁１の
弁開度を調節する。
また前記開度変更量Zsviが上下限設定器１３に
設定されている条件を満足しないときはその上限
又は下限の設定値に相当する信号により弁開度調
節器１４が流量調節弁１の弁開度を調節する。
なお上下限設定器１３に設定してある上下限設
定値は、前述した流量調節弁の制御特性を考慮し
た値である（第１図参照）。
然して調節された流量調節弁１の弁開度Ziは前
記弁開度計５にて実測され、それに関する信号は
弁開度調節器１４へフイードバツク信号として入
力されると共に温度変更量換算回路１５へ入力さ
れる。該温度変更量換算回路１５においては制御
特性を考慮した弁開度目標値（例えば50％）が予
め設定されており、この設定値と上述のように入
力される弁開度Ziとを比較し、その差を解消すべ
き温度変更量Tsviを換算する。
そしてその結果に関する信号は平均温度変更量
算出回路１６へ入力されるが、該平均温度変更量
算出回路１６へは他の枝管に係る温度変更量に関
する信号も入力され、下記(3)式による平均温度変
更量Tが算出されるようになつている。T
＝N
〓i=1
Tsvi／Ｎ ……(3)
次に平均温度変更量換算回路１７へは、上述の
ようにして算出された平均温度変更量Tに関す
る信号と共に前記温度変更量換算回路１５にて換
算された温度変更量Tsviに関する信号も入力され
る。そして平均温度変更量換算回路１７は両者を
比較して補正した補正温度変更量Tsvi′を算出す
る。
この補正温度変更量Tsvi′に関する信号は、蒸
気弁４に対応させて設けてある上下限設定器１８
へ入力され、該上下限設定器１８に設定してある
条件を満足するときは蒸気弁４に対応さてて設け
てある温度調節器１９へ入力され、それに基づい
て温度調節器１９が加熱器３内に供給される蒸気
の量を調節すべく蒸気弁４の弁開度を調節する。
このようにして調節された加熱器３内の蒸気量
により適度に枝管ｉ内の混合燃料が加熱され、そ
の温度は前記温度計６にて実測され、それに関す
る信号は温度調節器１９へフイードバツク信号と
して入力される。
上述の如く構成された装置を用いて混合燃料を
高炉羽口へ均等に分配送給すべくその分配流量を
制御する場合は、流量調節弁１の弁開度をその制
御特性を考慮した目標値に一致させるべく加熱器
３内への蒸気の供給量を調節し、枝管ｉ内を通流
する混合燃料の温度を調節するので、流量調節及
び温度調整の一方だけの制御では制御しきれない
ような条件についても相互に補い合つて分配流量
を制御することが可能となる上、応答性の優れた
流量調節弁１による制御を常に行わせ、混合燃料
の温度を調節する方法のみを用いて分配流量を制
御する場合のような応答性の悪さを解消すること
ができる。
また流量調節弁１の弁開度を所定の目標値とな
るように制御し、更にその下限も設定してあるの
で、流量制御機器の損傷、燃料の詰まり等の問題
が生じない。
なお本実施例においては複数の枝管にて混合燃
料を均等に分配送給する場合について述べたが、
各枝管ごとに送給量を変化させて混合燃料を送給
する場合又は単一の管にて混合燃料を送給する場
合においては、開度変更量換算回路１２にて開度
変更量Zsviを算出するときは、当該管内を通流す
る混合燃料の流量Fi及びその目標値を用いること
とし、更に温度調節用の上下限設定器１８へ入力
する補正温度変更量Tsvi′としては温度変更量換
算回路１５にて換算した温度変更量Tsviをそのま
ま用いればよい。
次に本発明の実施例について説明する。第４図
ａ，ｂはCOMを分配送給した場合の枝管内を通
流する固液混合燃料の温度、流量調節弁の弁開度
及び枝管内を通流する回液混合燃料の流量（実測
流量と目標流量との差）の経時的変化を示してい
る。
ａ は枝管に設けた流量調節弁の弁開度調節量
及び枝管に設けた加熱器の温度調節量を上下限設
定しつつ調節することにより固液混合燃料の流量
を制御する従来法により等量分配制御を行つた場
合、ｂは本発明方法により等量分配制御を行つた
場合について夫々示している。
図において、●印は固液混合燃料温度を、○印
は弁開度を、×印は固液混合燃料流量を夫々示し
ている。またこれらのデータを数値にて比較した
のが第１表である。表においてＣ，Ｄとは第４図
の横軸にて示す第一の時間帯Ｃ、第二の時間帯Ｄ
のことを夫々示している。
The present invention provides a coal/heavy oil mixed fuel flowing through a pipe,
This invention relates to a method for controlling the flow rate of a highly viscous slurry-like mixed fuel such as coal/tar mixed fuel. In the past, the only fuel used in blast furnaces was coke, but with the development of blast furnace technology, heavy oil was injected into the blast furnace through the tuyere as an auxiliary fuel, and in response to the recent energy situation, it was replaced with the above-mentioned heavy oil. As a result, coal/heavy oil mixed fuel (hereinafter referred to as COM) has been injected, and further injection of coal/tar mixed fuel (hereinafter referred to as CTM) is being considered. Therefore, the development of an excellent flow rate control method for highly viscous slurry fluids such as COM and CTM is eagerly awaited. As a method for controlling the flow rate of such fluid, a method is generally used in which control is performed by adjusting the valve opening degree of a flow rate control valve provided in a pipe, but in this method, a flow rate control valve that can effectively control the flow rate is used. There is a problem that the opening degree is limited. Figure 1 shows the control characteristics, with the horizontal axis representing the flow rate control valve opening and the vertical axis representing the flow rate. It can be seen that the flow rate adjustment amount can be greatly changed by changing the valve opening degree slightly, but when it exceeds 50%, the flow rate adjustment amount hardly changes even if the flow rate adjustment valve opening degree is considerably changed. Also, when the flow rate control valve opening is 25% or less, COM,
When controlling the flow rate of a fluid such as a CTM, it is best to avoid setting the flow rate control valve opening below 25%, as this may cause the flow rate control valve to wear out or become clogged with fuel. Furthermore, since fluids such as COM and CTM are temperature-dependent and highly viscous fluids, it is possible to control the flow rate by adjusting the temperature of the fluid flowing through the pipe with a heater attached to the pipe. This method has the disadvantage of poor responsiveness. On the other hand, the applicant of the present application proposed a method of controlling the fluid flow rate by adjusting the valve opening degree of a flow rate control valve provided in a pipe and/or the temperature control amount of a heater provided in a pipe (Japanese Patent Application No. 56 -213836) with the aim of improving its controllability and responsiveness. In this method, by adjusting the valve opening adjustment amount and temperature adjustment amount while setting upper and lower limits, the flow rate of COM flowing through the pipe is controlled with a target value of 350/hour. An example of the result is shown in Figure 2. It was shown to. In other words, in Figure 2, the horizontal axis represents time, and the vertical axis represents flow rate.
Valve opening degree and temperature are taken, and their changes over time (flow rate: solid line, valve opening: one-dash line, temperature: two-dot chain line)
This is what is shown. In the first time period A shown in the figure, appropriate flow control is achieved by adjusting both the valve opening of the flow control valve and the temperature adjustment amount of the heater. In the second time period B, the opening of the flow rate control valve has reached the lower limit valve opening (30%) set to prevent wear of the flow rate control valve, fuel clogging, etc., so the heater is closed. Control is performed only by the amount of temperature adjustment. Therefore, as mentioned above, it can be seen that control using only the temperature adjustment amount of the heater, which has poor response, requires a considerable response time to bring the flow rate to the target value (in this case, about 30 minutes was required). ). Furthermore, in the third time period C that follows, the flow rate control valve is controlled in a state close to its lower limit valve opening, and if the flow rate increases rapidly from this state, the situation will be similar to that in the second time period B. , there is a slight problem with control responsiveness. The present invention was made in view of such circumstances, and when controlling the flow rate of a solid-liquid mixed fuel in the form of a highly viscous slurry such as COM or CTM flowing through a pipe,
Excellent controllability and responsiveness, no damage to the flow controller,
It is an object of the present invention to provide a flow rate control method that does not cause fuel clogging. The method for controlling the flow rate of a mixed fuel according to the present invention is a method for controlling the flow rate of a solid-liquid mixed fuel flowing through a pipe by the valve opening of a flow rate regulating valve provided in the pipe. A temperature control means is provided in the liquid mixed fuel flow area, and a flow meter is provided downstream of the flow rate control valve, and a target value is set within a range of flow rate adjustment that can be appropriately controlled by opening and closing the flow rate control valve. , the temperature of the solid-liquid mixed fuel is adjusted by the temperature adjustment means so that the value detected by the flowmeter matches the target value. The method of the present invention will be explained below based on examples thereof. FIG. 3 is a schematic diagram showing the implementation state of the method of the present invention. Branch pipe i is one of the branch pipes into which the main pipe (not shown) is branched and led to the blast furnace tuyere (not shown), and in the middle of the branch pipe, there is a flow through the branch pipe i. A flow rate control valve 1 that adjusts the flow rate of the mixed fuel (COM) and a flow meter 2 that actually measures the flow rate of the mixed fuel
is installed. Further, a heater 3 is attached to the branch pipe i, and steam is supplied to the heater 3 after being regulated by a steam valve 4 in order to adjust the temperature of the mixed fuel flowing through the branch pipe i. It is becoming more and more common. Furthermore, a valve opening meter 5 is attached to the flow rate regulating valve 1 to actually measure the valve opening degree of the flow rate regulating valve 1, and a thermometer 6 is attached to a branch pipe i near the heater 3. is installed to actually measure the temperature of the mixed fuel in the branch pipe i heated by the heater 3. A signal regarding the flow rate F 1 of the mixed fuel flowing through the branch pipe i actually measured by the flow meter 2 is input to the average flow rate calculation circuit 11. A signal regarding the flow rate of the mixed fuel flowing through (not shown) is also input, and the average flow rate F is calculated using the following equation (1). F = N 〓 i=1 F i /N ...(1) However, N: Number of branch pipes (for example, 38) Next, the valve opening change amount conversion circuit 12 is supplied with the amount calculated as described above. Along with the signal regarding the average flow rate F , a signal regarding the flow rate F i of the mixed fuel flowing through the branch pipe i is also input. Then, the valve opening change amount conversion circuit 12 compares the two, uses the result to perform conversion using the following formula (2), and calculates the opening change amount Z svi of the flow rate control valve 1 attached to the branch pipe i. do. Z svi = f i (F i − F ) ...(2) The signal regarding this opening change amount Z svi is input to the upper and lower limit setter 13 provided corresponding to the flow rate control valve 1, and When a certain condition set in the lower limit setter 13 is satisfied, the input is input to the valve opening regulator 14 provided corresponding to the flow rate regulating valve 1, and based on the input, the valve opening regulator 14 adjusts the flow rate regulating valve 1. Adjust the valve opening degree. Further, when the opening degree change amount Z svi does not satisfy the conditions set in the upper and lower limit setter 13, the valve opening degree controller 14 changes the valve of the flow rate control valve 1 by a signal corresponding to the upper or lower limit set value. Adjust the opening. Note that the upper and lower limit setting values set in the upper and lower limit setter 13 are values that take into consideration the control characteristics of the flow rate regulating valve described above (see FIG. 1). The adjusted valve opening Z i of the flow rate control valve 1 is actually measured by the valve opening meter 5, and a signal related thereto is inputted as a feedback signal to the valve opening controller 14 and is also input to the temperature change amount conversion circuit 15. is input to. In the temperature change amount conversion circuit 15, a valve opening target value (for example, 50%) is set in advance in consideration of control characteristics, and this set value is compared with the valve opening Z i input as described above. Then, the temperature change amount T svi that should eliminate the difference is converted. The signal related to the result is input to the average temperature change amount calculation circuit 16, but the signal related to the temperature change amount related to other branch pipes is also input to the average temperature change amount calculation circuit 16, and is calculated by the following equation (3). The average temperature change amount T is now calculated. T = N 〓 i=1 T svi /N ...(3) Next, the average temperature change amount conversion circuit 17 receives the signal regarding the average temperature change amount T calculated as described above, as well as the temperature change amount conversion circuit 17. A signal regarding the temperature change amount T svi converted in step 15 is also input. Then, the average temperature change amount conversion circuit 17 calculates a corrected temperature change amount T svi ' by comparing the two. A signal regarding this corrected temperature change amount T svi ' is sent to the upper and lower limit setter 18 provided corresponding to the steam valve 4.
When the condition set in the upper and lower limit setter 18 is satisfied, the input is inputted to the temperature regulator 19 provided corresponding to the steam valve 4, and based on the input, the temperature regulator 19 controls the heater 3. The opening degree of the steam valve 4 is adjusted to adjust the amount of steam supplied into the steam valve. The mixed fuel in the branch pipe i is appropriately heated by the amount of steam in the heater 3 regulated in this way, and the temperature is actually measured by the thermometer 6, and a signal related thereto is fed back to the temperature controller 19. Input as a signal. When controlling the distribution flow rate in order to evenly distribute the mixed fuel to the blast furnace tuyeres using the device configured as described above, the valve opening degree of the flow rate control valve 1 should be set to a target value that takes into account its control characteristics. Since the amount of steam supplied to the heater 3 is adjusted to match the temperature of the mixed fuel flowing through the branch pipe i, control cannot be achieved by controlling only one of flow rate adjustment and temperature adjustment. It becomes possible to control the distributed flow rate by mutually complementing each other under such conditions, and also by constantly controlling the flow rate control valve 1 with excellent responsiveness and using only the method of adjusting the temperature of the mixed fuel. It is possible to eliminate the poor responsiveness that occurs when controlling the distribution flow rate. In addition, since the valve opening of the flow control valve 1 is controlled to a predetermined target value, and the lower limit thereof is also set, problems such as damage to the flow control device and fuel clogging do not occur. In addition, in this embodiment, a case has been described in which mixed fuel is distributed and supplied evenly through a plurality of branch pipes.
When feeding mixed fuel by changing the feeding amount for each branch pipe, or when feeding mixed fuel through a single pipe, the opening change amount conversion circuit 12 calculates the opening change amount Z. When calculating svi , the flow rate F i of the mixed fuel flowing through the pipe and its target value are used, and the corrected temperature change amount T svi ′ to be input to the upper and lower limit setter 18 for temperature adjustment is The temperature change amount T svi converted by the temperature change amount conversion circuit 15 may be used as is. Next, examples of the present invention will be described. Figures 4a and b show the temperature of the solid-liquid mixed fuel flowing through the branch pipe when COM is distributed, the valve opening of the flow rate control valve, and the flow rate of the liquid mixed fuel flowing through the branch pipe (actually measured). The difference between the flow rate and the target flow rate) changes over time. a is based on the conventional method of controlling the flow rate of solid-liquid mixed fuel by adjusting the valve opening degree of the flow rate control valve installed in the branch pipe and the temperature adjustment amount of the heater installed in the branch pipe while setting upper and lower limits. In the case where equal amount distribution control is performed, b shows the case where equal amount distribution control is performed by the method of the present invention. In the figure, the ● mark indicates the solid-liquid mixed fuel temperature, the ○ mark indicates the valve opening degree, and the x mark indicates the solid-liquid mixed fuel flow rate. Table 1 is a numerical comparison of these data. In the table, C and D refer to the first time period C and the second time period D shown on the horizontal axis in Figure 4.
Each shows the following.
【表】
第４図ａ，ｂ及び第１表に示す如く本発明方法
による場合は従来法による場合と比して流量が目
標値に略一致しており、そのばらつきも小さくな
つていることが分かつた。また本発明方法による
場合は弁開度が上下限状態になつている流量調節
弁は皆無であり、流量調節弁による制御が常に行
われていることから本発明方法は応答性が優れた
制御方法であることが分かつた。
以上の如く本発明にあつては、流量調節弁より
も上流側の固液混合燃料通流域に温度調節手段
を、また流量調節弁よりも下流側に流量計を夫々
設け、流量調節弁の開閉による適正な制御が可能
な流量調節の範囲内に目標値を設定し、流量計に
よる検出値を目標値に一致させるべく温度調節手
段により固液混合燃料の温度を調節することとし
たから、温度調節手段による流量調節の粗さ、応
答性の遅さを流量調節弁によつて補い、また流量
調節弁による流量調節では摩耗、詰まりを生じる
虞のある範囲内は温度調節手段によつてこれを補
い得ることとなり、流量調節弁による制御及び温
度調節手段による制御が相互に補い合つてその制
御性を向上させ、また流量調節弁による制御を常
に行わせてその応答性を向上させ、更に流量調節
弁の弁開度を適正な範囲内として制御して流量制
御機器の損傷、燃料の詰まり等の発生を防止する
ことができる。
従つて本発明は高炉操業において、省エネルギ
を図るべくCOM、CTM等の高粘性スラリー状の
固液混合燃料を高炉羽口から吹き込む場合等に特
に優れた効果を奏する。[Table] As shown in Figures 4a and b and Table 1, when the method of the present invention is used, the flow rate almost matches the target value and the variation is smaller than when using the conventional method. I understand. In addition, in the case of the method of the present invention, there are no flow control valves whose opening degree is at the upper or lower limits, and control by the flow control valve is always performed, so the method of the present invention is a control method with excellent responsiveness. It turns out that it is. As described above, in the present invention, a temperature control means is provided in the solid-liquid mixed fuel flow area upstream of the flow rate control valve, and a flow meter is provided downstream of the flow rate control valve, and the flow rate control valve is opened and closed. The target value is set within the range of flow rate adjustment that can be properly controlled by A flow control valve compensates for the roughness and slow response of the flow rate adjustment by the control means, and a temperature control means compensates for the roughness and slow response of the flow rate adjustment by the flow control means. Therefore, the control by the flow rate control valve and the control by the temperature control means complement each other to improve the controllability, and the control by the flow rate control valve is always performed to improve its responsiveness, and the control by the temperature control means is improved. By controlling the opening degree of the valve within an appropriate range, it is possible to prevent damage to the flow control device, fuel clogging, and the like. Therefore, the present invention is particularly effective when a solid-liquid mixed fuel in the form of a highly viscous slurry such as COM or CTM is injected from the blast furnace tuyere in order to save energy during blast furnace operation.
第１図は流量調節弁の制御特性を示すグラフ、
第２図は従来法によるCOM流量の制御結果を示
すグラフ、第３図は本発明方法の実施状態を示す
模式図、第４図ａ，ｂは本発明方法の効果を示す
グラフである。
ｉ……枝管、１……流量調節弁、２……流量
計、３……加熱器、４……蒸気弁、５……弁開度
計、６……温度計、１２……弁開度変更量換算回
路、１３，１８……上下限設定器、１４……弁開
度調節器、１５……温度変更量換算回路、１９…
…温度調節器。
Figure 1 is a graph showing the control characteristics of the flow control valve.
FIG. 2 is a graph showing the results of controlling the COM flow rate according to the conventional method, FIG. 3 is a schematic diagram showing the state of implementation of the method of the present invention, and FIG. 4 a and b are graphs showing the effects of the method of the present invention. i... Branch pipe, 1... Flow control valve, 2... Flow meter, 3... Heater, 4... Steam valve, 5... Valve opening meter, 6... Thermometer, 12... Valve open Temperature change amount conversion circuit, 13, 18...Upper/lower limit setter, 14...Valve opening controller, 15...Temperature change amount conversion circuit, 19...
…air conditioner.
Claims (1)
けた流量調節弁の弁開度調節により制御する方法
において、流量調節弁よりも上流側の固液混合燃
料通流域に温度調節手段を、また流量調節弁より
も下流側に流量計を夫々設け、前記流量調節弁の
開閉による適正な制御が可能な流量調節の範囲内
に目標値を設定し、前記流量計による検出値を前
記目標値に一致させるべく前記温度調節手段によ
り固液混合燃料の温度を調節することを特徴とす
る混合燃料の流量制御方法。1. In a method of controlling the flow rate of solid-liquid mixed fuel flowing through a pipe by adjusting the valve opening of a flow rate control valve provided in the pipe, a temperature control means is provided in the solid-liquid mixed fuel flow area upstream of the flow rate control valve. Further, a flow meter is provided downstream of the flow rate control valve, a target value is set within a range of flow rate adjustment that can be properly controlled by opening and closing the flow rate control valve, and the value detected by the flow meter is set to the target value. A method for controlling the flow rate of a mixed fuel, characterized in that the temperature of the solid-liquid mixed fuel is adjusted by the temperature adjusting means so as to match the temperature of the solid-liquid mixed fuel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3992982A JPS58158720A (en) | 1982-03-12 | 1982-03-12 | Flow rate controlling method for fluid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3992982A JPS58158720A (en) | 1982-03-12 | 1982-03-12 | Flow rate controlling method for fluid |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58158720A JPS58158720A (en) | 1983-09-21 |
| JPH0454246B2 true JPH0454246B2 (en) | 1992-08-28 |
Family
ID=12566625
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3992982A Granted JPS58158720A (en) | 1982-03-12 | 1982-03-12 | Flow rate controlling method for fluid |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58158720A (en) |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5733719A (en) * | 1980-08-06 | 1982-02-23 | Sumitomo Metal Ind Ltd | Controlling method of flow rate distribution for mixed fuel |
-
1982
- 1982-03-12 JP JP3992982A patent/JPS58158720A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58158720A (en) | 1983-09-21 |
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