JPS5946404A - Feedwater controller - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] [Technical field of invention] The present disclosure relates to a water supply control system for a Niitun plant.

[Technical background of the invention]

For example, in the thermal power plant 1, as shown in Fig. 1, the superheated steam generated in the boiler 1 is pumped to the main turbine 2, the expanded steam is returned to the boiler 1, and the reheater 3 The water is heated to an extremely high temperature (11), expanded rapidly in the main turbine 2, and cooled in the condenser 4 to become saturated water. The power plant system in this thermal power plant includes steam turbine driven pumps (T-BFP-A), 5.4A air turbine driven pumps (T-BFP-IJ), 6 steam turbine driven pumps (M-BFI), and 7. It consists of a water supply pump outlet valve 8 provided on the pump discharge side, and when one or two of these water supply pumps are operated, the upper 6 self f! iU ;'F
IJ water is pressurized and supplied to boiler 1.

In recent years, many thermal power plants have adopted variable pressure operation in which the boiler pressure is increased depending on the A load, but in variable pressure operation, the feedwater pump's sludge flow is mainly as shown in curve 9 shown in Figure 2. Yε).

That is, in FIG. 2, No-N3 is a curve representing the relationship between the pump flow rate Q and the pump head (water resistance pressure) H with the rotation speed as a parameter. I? When the pump rotation speed is constant,
The pump flow rate Q and the water pressure H can take arbitrary values on this curve. Curve 10 shows the relationship between the boiler outlet main steam flow rate and pressure required based on the plant load increase plan +I
IJIffl. This issue? Ira exit main illumination θ)CL
This is a song that shows the relationship between LT and pressure. This boiler outlet main steam amount + gland 10751 and boiler population A sui υit
Volume and pressure are determined as shown in curve 9. This curve 9
To the system, when the y-curve is cut, when the pressure is applied, W
aWater bomb 0 , water supply flow rate 1ti control is required at a predetermined rotation speed or higher. On the other hand, in the low range of the system head 9 curve 9, it is recommended to increase the speed of the i1'iG water ponzo to increase the number of revolutions. l
! II j For wholesale, throttle the water supply bonder outlet valve jf 1
Since market pressure will be applied after iiJ, the cost requirement is to operate at as low a rotation speed as possible. Therefore, conventionally -2, while controlling the rotation speed to a short rotation speed in the low load zone, , ij control lI41 sets the opening degree of the water supply pump outlet valve to a! ! 4 *i No luck with L, water supply 4 if you enter the city delivery zone? While fully opening the pump outlet valve, adjust the rotation speed to supply water +l'lt A: 1ill 1+t
Figure 2 Y (
If N1 is the target rotational speed when controlling the rotational speed in a low load zone, then in a low-mounted engine p'i city, the leg rotational speed Nl is divided by +
+l-11 while tiζf water υ11. By setting the opening degree of the exit slot P by J・1 according to the amount ν ice, υ, from 0 point to 9
Move to point 1 and supply water v'+t it Q k J Buyer 1
” At point 06, the water supply pump outlet valve is fully open, and at point 0, it is fully open. Between the 0 point and I) A is the exit juice IJ L
ilJ degree (beforehand, depending on the opening degree, force 4i /
The area where J (and 1. This is the region where the water υii', iIi Q increases, and the water supply flow 'Lli-Q is determined by the rotational speed. water +/
At the wind control tsuba at 0 of 1C and Q, fully open the live water pump outlet valve and adjust the rotation speed to adjust the flow ii1iiOn+4
Since there is a switching point that shifts to 1, the operation of the open side is impaired, causing vibrations in the water supply flow rate and pressure at the switching point, which affects pumps and valves. In addition, when operating by manual operation, it is necessary to determine at which point on the system head curve the plant state is, that is, to determine the flow rate i'u of the water supply flow rate Q depending on the opening dimming j of the regular water pump outlet.
:l +Wholesale? Judging whether it is in the J now area or in the singing area where υ water supply flow 1 and Q's υij 臘i 鼠 1111 Il is performed by adjusting the rotation speed by turning the water supply bonder out 1゛♀1jIi and exiting. JP Adjust both the opening and rotation speed.
71" or the next hole, there was a problem in the temple where the operation became extremely sloppy.

[Purpose of the invention]

Misfire J It: J', % (trlJ l1llll
The purpose is to maintain the smoothness and flexibility of the operation, and to provide the water liner 11 devices 1 to 1 for manual operation.

[Outline of ``release ψ'']

For this reason, in the current 13th year, the pump rotation speed was set to exceed the dangerous rotation speed range.''2.
At the same time as controlling the pump rotation speed fII11, while the pump rotating ore is in the Ilj can area, the water supply pump outlet 4+゛ is changed from fully closed to public Ji4 'J= and the inlet pressure becomes -, and the opening length is increased. , city 111 mark-j%
be a sign.

[An offering of invention]

FIG. 3 shows an embodiment of the present invention? water rli']
In the configuration diagram of the filv ironworker, 11 is the water supply control in device 1χ
, 12 is the plant side water supply equipment. This water supply tlil
l (iii device) 1 is the water supply pump outlet valve open k ?l
i! J (consists of two control systems: the ijl system and the water pump rotation speed control system. Historically, the water supply pump outlet valve opening control line is based on the target value PR of the water supply pump output single-force pressure,
Plant 1 [feed water obtained from tll, flit with j9 pump outlet valve pressure P! The difference is calculated, and the deviation is applied to the proportional product numerator id control element J3, +ti! [Prompt] A water supply pump outlet valve opening command obtained as an output of the pump 13 is given to the amplifier 14. The servo pump 14 is configured to drive the actuator 15 in accordance with a given outlet valve opening command to adjust the opening degree of the water pump outlet valve. On the other hand, the water supply pump rotation speed ratio is 2.
The target value QR of the nL quantity and the pale north of the water supply flow obtained from the lant side are expressed as p, shi, and its polarization is proportional to the polarization side 1
Surf 3? to the amplifier 17. The servo amplifier 17 is configured to drive the actuator 18 according to a given water pump rotational speed command to increase the water pump rotational speed W·', ]141.

”-Note 11・■ When the agent water is pumped out, the pressure target value P+t for “Person 1”? ', j, boat) Water pump/''included! Make sure that the rotational speed of the turbine is always at least 12a rotational speed, or you can do it in the meantime/', iJl li ::!Choose 4-C in advance＞'
t will be done. On the other hand, shore 11 water tAF, :1jll target value Q
+t i-J diagram no j < not APC (automatic plant control j
II device & ) with boiler master command and 1 yen water bit,
; 0 obtained by compensating the deviation from 0, therefore, based on the plant load increase plan, the safe water flow rate applied to the water resistant control equipment 11 from the APC 1 + h,
QR Ka J'i4 /Jll 'jc start Zurt, A?
; water fill fill 4i iit, I IV
, t8 water 4 to follow the increasing target 1 shift QR? Increase the pump speed index and increase the feed water flow -Q.

7)～゛1 water bomb 0 times 1117, when Makoto adds a shield,
Since the water supply pump outlet J upper blade, i.e., jF water bonzo output valve population level increases, the difference between the first order 1 and the target 11 ILPR increases, opening the water supply pump output lob and increasing its opening IW. Let the person L1 pressure - Po's goal 1i "t
PH + 1] - 1

When the target 1 shift QR of the water supply flow LIj is added to the east by ``I,l'', the same operation is repeated and the water supply 7 in Fig. 2 is added.
From point E at 1 o'clock to point 1 at full open 71.8 Wednesday while being held in PR,) IL Co. 1Q failed.

At point f), the exit is 1゛, and from this point υ,
History j1iI7j top! When faced with the necessity of increasing the system head curve 9''2 by increasing the demand for 1.
The target values Q and R are not shown (increased to Sano of the tiger material 4, and the water supply side (ill device M1) increases the water supply pump rotation number (6 orders) to increase the water flow rate Q. When it increases, 1. Flood control pump output ('masu population per month increases, so the water supply pump outlet ff'l-'f] m-command &
(Requires additional work on development. However, 1.
, ↓ Since it is already fully open, it will remain fully open when it is tied up with the load ahead.

In this way, water vit M: Q's llk 01
+, +Hi to +'t'r Flow r(i. 6.1B water flow L4i electric "suppression"("out1") regardless of the A section of the opening degree, ne water pump in all enclosures over the flow r(i. This is done by adjusting the four-turn ridge.

Therefore, in the case of this S example &CkJ, 1 statement νL rice 1
Irrigation water υ explained in [41]! j i+ of control operation 1,1
There is no monthly stress point, all-C from low load ■) to surface load emperor
Continuous and smooth control can be performed in this range.

Also, when operating the water pump f manually, even if you do not know at which point the plant head is on the system head curve, -14 is the first vote value Cf for the water supply flow rate. Alternatively, manually operate the rotation speed of the water supply pump by adjusting the rotation speed of the water supply pump.
By doing i, one water supply company's ii! I + Wholesaling can be done.

Four to one. The LJ image value of the utility power is the water supply pump, the drive fly (turbine critical cycle 11, setting 1 shift over several ranges, and that 1 shift 1 shift) (as much as possible) By selecting 1 person and 7E, δ”+
: +I to 7? force on the pump outlet valve” +tiJ [
By making the 4th run 1st smaller, you can also eliminate the d herare given to one run.

In the above-mentioned article 1], we explained the water supply control 1LlI:tQl valley of the thermal power plant Kame plant as an example. The Japanese water system ktl is also t14 Jll +su111
Of course, the original number is 111.

[Effect of brother Ming]

According to the present invention, as shown in ``2'' below, the low position 1'+j
i! Smooth i-water control can be performed from + to high negative range by using only the rotation number 141j, and 1.41
．． ! l :+i'l! At the same time, JJI makes it easy to move, and at the same time makes it easy to move automatically and manually. I S water system Tsukuda j≠, II A is obtained 2).

[Brief explanation of drawings]

Figure 1 ←L shows an example of application of the present invention, and shows a water supply system diagram of a temporary thermal power plant, Part 2: I
Figure 3 is the u-H curve diagram of the water pump, which is the cause of (1) of the water supply control system, which shows the first loss of the present invention.l... Boiler, 2 ...Main turbine, 3...(・1
Heat gain, 4... Ling Shui Seki, 5, 6... Fish turbine! ′
j, 4 i "il pumping, 7...'-6 motion, j5 n 1.8...4 combined water, I? pump output L"] [,
9...System head curve, 10...Boiler output (principal point (curve, 11...η water landing) iii +ν (1 device; i, 12...Plant 1 + H1 water supply 11 Zo 1
is13+16... Ratio 1 Nori 4 Responsibility Mountain 1
1iil', υ thread, 14.17...-'j-
't'J'rQ Width, I 5 , . 18... Acnereta. Figure 7 Figure 3

Claims (1)

[Claims] In a total water system water supply control device including a water supply pump outlet valve at the discharge port of the water supply pump, means for adjusting the opening or failure of the water supply pump Yamaguchi valve according to the deviation between the target value and the actual value of the water supply pump outlet valve inlet pressure; , means for adjusting the rotation speed of the water supply pump according to the deviation between the target value of the water supply flow rate and the actual water supply flow rate 11q.