JPS59173526A - Method and device for controlling blast furnace gas energy recovering turbine - Google Patents

Abstract

PURPOSE:To recover efficient energy by opening and closing only a part of stationary vanes when the flow rate of the blast furnace gas that passes through a recovery turbine is low, while opening and closing the whole stationary vanes at the same angle when the flow rate of the gas is high. CONSTITUTION:Stationary vane driving signals xsi which are sent out from a governor 8 is fed to the two converting parts 91, 92 of a signal converter 9 through a line l1 and, then, they are fed to stationary vane driving devices 521, 522 through lines l2, l3, as output signals xsi1, xsi2 respectively. Each of the driving devices 521, 522 controls the stationary-vane angles of a part of stationary vanes 511 and the stationary-vane angles of the remaining stationary vanes 512 through driving rods 531, 532 respectively. That is, when the flow rate of a blast furnace gas passing through a recovery turbine is low, the stationary- vane angles of only a part of stationary vanes 511 are controlled, while controlling the remaining stationary vanes to be in a totally closed condition. On the other hand, when the flow rate of the gas is high, the stationary-vane angle of the whole stationary vanes 511, 512 are controlled so as to be opened or closed at the same angle or almost at the same angle.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a stator blade control M& structure for a blast furnace gas energy recovery turbine having variable pitch stator blades, and a method for controlling a blast furnace gas energy recovery turbine plant using the same.

Conventionally, in order to recover the energy possessed by the blast furnace gas discharged from the blast furnace, a recovery turbine 5 is placed in the blast furnace gas discharge system in parallel with the septum valve 3, as shown in Fig. 1(a), to reduce the furnace top pressure. The septum valve 3 is controlled to maintain a preset value, and a part of the blast furnace gas is supplied to the recovery turbine 5 for energy recovery. In such prior art, energy recovery from the blast furnace gas passing through the septum valve 3 is not performed, so the recovery efficiency is quite low.

One way to solve this problem is to use conventional methods as shown in Figure 1 (L
, ), during normal operation, the septum valve 3 is fully open, and the speed regulator valve 14 controls the furnace top pressure to 1v1.
In the event of an abnormality in the blast furnace or when the turbine starts or stops, the governor valve 14
In cases where the entire range of l#lJ is controlled, a method has been considered in which the septum valve 3 is moved forward. This method also has the problem that when blast furnace gas bleeding decreases, the regulating valve throttles the flow rate in order to keep the furnace top pressure constant, resulting in large scale losses and low energy recovery efficiency.

Furthermore, in order to solve this problem, in Ike's prior art, a variable pitch static A is installed in the recovery turbine 5, and the static pitch T4 is changed in place of the governor valve 14 to adjust the vibration of the gas flow passing through the turbine. It has been considered to control the furnace top pressure using the furnace top pressure 1ljlJ and the rotation speed when starting and stopping the recovery turbine 5. In the slightly open state where the static A pitch angle is 0, that is, the fully open state gradually increases, not only does it generate a large noise, but the sensitivity of the opening convection is very crystallized, especially when the generator load In such cases, it is very difficult to design a rotation speed control device when controlling the no-load rated rotation and synchronizing it to the power grid.

One way to solve this problem is to use the regulating valve 14 to control startup, shutdown, synchronization, and other operations when the flow rate passing through the turbine is small, so that the furnace top pressure can be adjusted in advance against disturbances such as the injection of μ-9 into the blast furnace. The furnace top pressure is maintained at a set value by changing the stator blade pitch. Even with this method, when the regulating valve is slightly opened,
The diaphragm generates loud noises and shock waves that adversely affect the quietness downstream.

FIG. 1C shows a prior art blast furnace gas energy recovery plant. The 1% furnace gas discharged from the blast furnace 1 passes through the stripe remover 2, and when the recovery turbine is stopped, the septum valve 3
The furnace top pressure P is controlled by control number 1d from the furnace top pressure control device 7.
The blood is directed to the downstream side so that b is maintained at the furnace top pressure set value pBS.

On the other hand, when starting the recovery turbine 5 from this state, first fully open the shutoff valve 4, and then increase the setting value of the rotation speed setting device 811 of the speed regulating function 81 of the governor 8 to more than 1. Collection turbine 5's silent Kaede 51's ill 1
．． The NK angle is gradually opened to 0 (fully closed), the blast furnace gas is fed to the recovery turbine 5, and the rotation of the recovery turbine 5 and the generator 6 driven by the recovery turbine 5 is gradually increased. When the rotational speed of the recovery turbine 5'' and the generator 6 reach the rated rotational speed, the generator 6 is synchronously connected to the power system M. At this point, the governor 4a function 81 becomes unstable, so the rotational speed setting device 811 Release to the upper limit.Low selector 8 in Kapana 8
3, the function of the governor 8 is transferred from the speed governor 81 to the pressure regulation function, and the quiet angle of the static space 51 of the recovery turbine 5 is changed by the signal from the pressure regulation function of the governor 8,
It acts to maintain the furnace top pressure Pb at the set value pss. At this time, the set value 1) 8.5 is preset to a value slightly lower than the furnace top pressure set value pBS of the furnace top pressure control device 7 that drives the septum valve 3 (that is, pss=pBS-ΔPBS). As a result, the septum valve 3 is fully opened and all the sieve furnace gas passes through the recovery turbine 5.
can convert and recover the maximum amount of energy contained in blast furnace gas into electricity.

In such an operation of the recovery turbine 5, the recovery turbine 5 must be operated at a small opening degree from the time when the recovery turbine 5 is started until the synchronization is turned on, and the rotation angle of the recovery turbine 5 must be adjusted by one θ. In addition, in the operating section of the fermentation where energy is recovered, the stator vane angle is opened as much as possible, and the angle of the stationary blade is adjusted near the rated point so as not to disturb the gas flow as much as possible by closing the angle. Then set the furnace top pressure pb to the furnace pressure (
It is necessary to control to maintain it at alPss.

Here, the prior art I#'8 tile system ma shown in @1 Figure CC)
The structure 100 will be explained with reference to FIG. [The stator vane drive signal ξ output from the α air governor 8 is input to the stator vane driver 52, where it is converted into a mechanical displacement xK to drive the stator vane angle θ. Using this mechanism, all n + Adjusting the numbers is very difficult and often results in synchronization failures.

The purpose of the present invention is to provide a static space control mechanism that solves the above-mentioned technical problems, and in which all static spaces change at the same angle during steady-state operation and does not cause disturbances in the flow of blast furnace gas, and a static space control mechanism that uses this mechanism. An object of the present invention is to provide a method for controlling a severe gas energy recovery turbine plant.

FIG. 3 shows a block diagram of the main parts of an embodiment of the present invention. The silent stabbing 4g No. ξ sent out from the governor 8 is 18
The line 11 is connected to the two converters 91 and 92 of the code converter 9.
are provided via lines 12 and l!, respectively, and the output signals ξ1 and ξ2 are provided through lines 12 and l! Sends 3Vc. The stator vane driver 521 has an output value ξ via the line 12.
1, and stator vane drive #J unit 522 communicates output signal ξ2 via line 13. Therefore, Shizuka drive rod 531
and 532 are driven and controlled by the mechanical displacements x1 and x2, and are configured to cut the stator blade angle θ1 of some of the stator vanes 511 and the stator blade angle θ2 of the remaining stator blades 522, respectively. There is.

FIG. 4 shows #! sent from the nausea governor 8 when configured as described above. j4 drive signal, the stator blade angle θ1 of some of the stator blades 511 and the stator blade angle θ2 of the felling stator blade 512,
Indicates the relationship between the two. By setting as shown in Figure m'4, the relative control rlLl (i: '8ξ small 0
In the range of ≦ξ〈ζA, only a part of the static As1t changes in angle, the remaining static As1t remains fully closed, and then the static control factor increases, and ξA≦ξ ξB. Once within the range, the stationary blades 511 of the - group are stationary at a predetermined constant angle, and the remaining stationary blades 512 are at a sharp angle. Further, when the static difference 1b control G11l becomes ξ or ξ≧ξB, all the static 1A511 change angle V by the same angle. With this configuration, when it is necessary to control minute flow ebbs and flows with static Kaede, such as from the start of the recovery turbine 5 to the synchronization, in other words, when the stator blade drive signal ξ operates in a range smaller than ξA. In this case, it is only necessary to operate the angle of the second part 2451x to make it easier to control the gas flow. Furthermore, the furnace top pressure jlil (i
It is operated in the 111 state and the normal operating state, i.e. #
Commercial cutting (S") When Jξ operates near the rated operating point ξR, all stationary positions 51 change at the same angle, causing turbulence 7'1.'fc in the wake of Shizuoka 51. Then, the recovery turbine 5 is operated stably, and the older cylinder 6 is driven to convert the energy possessed by the furnace gas into chemical power for recovery.

As described above, one embodiment of the present invention includes a signal quality control section 9, which is composed of converters 91 and 92, which are driven by the static tm*m# signal ξ output from the power source 8; Silence reduction # 521 and 522, each silence drive rod 53
Regarding the stator vane controller 5200 composed of 1 and 532, the 100th converter section 9 functions as a converter at the 1st level, and is driven by its output. Each a m seat wt device 521 and 522tri, H number and bell output = number ξl and ξ2, love 1 output, mechanical position x1 and x
The explanation was given by taking as an example a servo mechanism that narrows down to 2.

FIG. 5 shows another embodiment of the servo mechanism.

Input the static filter 1d number ξ from the governor 8 to the compound cam 1 small unit 52a consisting of a servo mechanism, for example,
For example, the composite cam 10 as shown in Fig. 6 is the first! It is also possible to configure the static control rod 200 so as to move it in the direction of the arrow y, thereby driving the driving rods 531 and 532.

Figure 7 shows the height of the stator vane controller 44Ij 20LJ.
This is an example of Ibiki's Tentane. i'i'f' from governor 8 −
A continuous driving device 5 consisting of a servo mechanism that divides the drive signal ξ into one section.
2b, and the ren-kei-kei-ki 52b is given by some masters @ Kakusuke-kei 53
Drive 0 with four wheels. Furthermore, regarding the joint between the silent wing drive cutting rod 530 and the valley static bird driving connecting rod 540, the silent driving connecting rod 542 that drives a part of the static m51.1 removes the static blade 9. IjJ rod 5
30 and the oval shape tllt f, fl < 552 so as to be rotatable and vertically adjustable, and further biased downward by a spring 562. Therefore, in the order of FIG. 7 (a), (+)), (c), Vc <,
= the direction in which the rest 51 is closed from the fully open state, that is, the acid 1
When the A-stroke connecting rod 53'O moves too much, part of the blade 511 of H4 in FIG.

When the stator vane front rod 530 moves further downward, as shown in FIG.
The state of C), that is, the partially static TA 511 also becomes a fully closed window. In this case, the tip of the opposite drive connecting rod 542 that makes the remaining static ν joy 512 oily is oval shaped? 7it if < 552, the force of the d: spring 562 that is attracted to the lower end is blocked from the lower end of the groove 552, allowing the stationary tool driving rod 530 to move downward.

FIG. 8 shows the stationary drive mechanism 200, which is sent out from the stationary drive mechanism 200 and from the kapana 8, as shown in FIG. 7 above. I force 1 word ξ and -state S tfJ' difference 511
l'14': +1) Moon σ 1 and Hari no U or 512 song April 02 and Sen 1 τ uzu. In this case as well, we require the full opening of the Taisho No. 1 ζ or a few 0〈ζkuξ
If it is in the range of A, only i'+p I'ip difference 511 or IfjIIA month θ1? r: IJIJ sa, ma/
Kostop + 1r ym 'ilx + N area ξ = ζR
In the final report, Ichigun Misaki 511 was also cut down, and Ichigun 512 was also omitted.''
It is convenient to use a stator vane angle of 1 to 1 to reduce the furnace gas flow rate to 1.

As shown in the examples above, the stator vane control substructure 200 can be controlled by using a pneumatic type, a hydraulic type, a mechanical type, or a combination thereof, to control a part of the stator blade 51 of the recovery turbine 5. Silence ^
511 and the stationary blade 512 of the felling are slightly 1 JPJ, the opening degree of only the silent 511 is changed partially, and the Shizuoka 512 of the cutting is changed.
is maintained in a total 13-J state. Also, the stop of the recovery turbine 5
In other words, when the static fi 51 is operated with 1 degree of static fi 51 at 1 nob, some of the static blades 511 and the silence 512 are the same or Ill! By changing the stator blade angle of 1cjJ-, the recovery turbine 5 can operate in the normal operating range from start-up even if the function of the conventional recovery turbine 5 using the continuous valve is removed. It can be done safely, quietly;) efficiently.

The following embodiments are all blast furnace gas energy recovery turbine plants in which a septum valve 3 is installed in parallel with a recovery turbine 5 in the exhaust gas system of the blast furnace plant.

FIG. 9 shows another embodiment of the sieve furnace gas energy recovery turbine plant. In No. 9, the same components as shown in FIG. 1 are given the same reference numerals.

This embodiment is a blast furnace gas energy recovery turbine plant including a ring slit washer 11 in the blast furnace gas exhaust gas system for the purpose of dust removal function and furnace top pressure control function. A bypass valve 12 is installed in parallel with the recovery turbine 5. The furnace top pressure is always controlled by the ring slit washer l-1, and from the start νJ of the recovery turbine 5, 161 in the synchronized input building is controlled by the bypass valve 12 to keep the turbine 1jfJ EtE P F constant K by the turbine III pressure control device 13. '+li'J control, after synchronization, bypass valve 12
Keep it fully closed. Turbine surface pressure P1 due to recovery turbine 5 or Kapana 8? Sub A.111. In this type of blast furnace gas energy recovery plant, 1
J11 describes the case of a blast furnace gas energy recovery plant with 5 varnishes, 51 pts., and 1i = il, the furnace top pressure is the turbine 14ij pressure, and the septum valve is removed. It is clear that it is possible to control the recovery turbine using the P gas energy recovery turbine control system, which is a function of the E group control 4 function.

According to the present invention, as shown in FIG.
] In places where slight direct weight adjustment is required, such as when charging, only a part of the static world is stirred, so the precise flow rate adjustment is "J'nE" and the noise is reduced. In addition, during streetcar operation, etc., all differences in the flow rate of blast furnace exhaust gas due to material charging, etc. are improved in the same way at the same angle, and the furnace top pressure is improved.
Therefore, no turbulence is caused in the fluid, and as a result, efficient energy recovery is achieved.

[Brief explanation of the drawing]

Figure 1 is a block diagram of a blast furnace gas energy recovery plant in the prior art, and Figure 2 is a static control and structure 2 in the prior art.
00, FIG. 3 is a block diagram of Wang Biandu according to the embodiment of the first invention, and FIG. A graph showing the relationship between the angle θ12 of t511 and the angle θ2 of the yoke 512, and FIG. 5 is the static control side 1 mechanism 200.
A configuration diagram of another embodiment of the first invention, FIG. 6 shows the composite cam 1.
A diagram for explaining the displacement force direction of 0, Fig. 7 f-i static fly;
Still other embodiments of the first invention of μsu 1 Kano 5 Isokai 200,
Figure 8 shows the static diagonal θ1 of the fil 4 drive signal sent from the governor 8 when the calming control mechanism 200 is configured as shown in Figure 7. '
FIG. 9 is a block diagram of the blast furnace gas energy recovery turbine of the second invention -J Hu1. 1. Blast furnace, 2. Dust remover, 3. Capkum valve, 4.
・Crystal cutting valve, 5... Recovery turbine, 6... Generator, 7
...Furnace top pressure 11tlJ monument device, 8...Governor, lO...
・Multiple cam, 11...Ring slit sociator, 12
Nokuinoyasu valve, 13...Turbine support pressure city 1jf bending device, 51 ・Misaki i4, '52...Misaki Seki spinning machine, 81
...Reading function, 83.Low 1v selector, 91.92...
Hentaiki, 511,512...Tekketsu, 521.522
...1p strange qIIJ vessel, 530,53
1゜532...Drinking group 1 drive 11 rod, 542...111
1' Sitting νJ connecting rod, 552... Exploring the capital, 562... Spring agent Patent attorney Kei Nishi Part 3 Figure 4 Figure 5 Figure 6 -[-Co

Claims (2)

[Claims] (1) In a blast furnace gas energy recovery turbine power generation plant where a recovery turbine is installed in the exhaust gas system of a blast furnace plant to collect blast furnace gas and convert the energy contained in the blast furnace gas into electricity, the blast furnace gas is used to MM the recovery turbine. When there are few meteors, only one of the stationary blades is opened and closed, and the remaining stationary blades are kept fully closed. Furthermore, when the gas flow rate passing through the recovery turbine is large, A blast furnace gas energy recovery turbine control device characterized by having a static storm control mechanism that opens and closes the egg blade angles of all stationary blades at the same or substantially the same angle to adjust the flow rate of blast furnace gas passing through the recovery turbine. (2) A recovery turbine is installed in the exhaust gas system of the blast furnace plant, and the energy contained in the blast furnace gas is recovered by converting it into electricity. from) A3
Until the electric machine is synchronized into the gravity system, the furnace top pressure or turbine IJtJ pressure is controlled using the septum valve or bypass valve that has been reinstalled in parallel with the recovery turbine. Based on the output signal from J+J, only the stator blade angle of one group of the stator blades is opened or closed through the J+J stator blade control side structure, and the remaining static vanes are opened and closed.
The corner is arbitrarily held in a fully open position, and the flow rate of the Shima Furnace gas passing through the recovery turbine is set to 1 A, thereby controlling the rotational blow of the recovery turbine.
Furthermore, after the synchronization is turned on, the septum valve or bypass valve is kept in a waiting state in an almost fully closed state, while the recovery turbine is operated in a fully closed state by an output signal from the governor via a silence control mechanism. The blast furnace gas flow 1 passing through the recovery turbine is
Key 17? j L, control the furnace top pressure or turbine front pressure (
H control method of a blast furnace waste energy recovery turbine characterized by illumination.