JPS5946403A - Controller for water level - 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 the Invention] The present invention relates to a water level control device, and particularly relates to a water level control device for a feed water heater used in a thermal power plant or a nuclear power plant. Regarding.

[Technical backlog of 96 Ming] Figure 1 shows a system diagram of a well-known power generation plant including a feed water heater. It shows 14 formations.

In the same figure, the water supplied from the condenser 9 is 11] Water pump 1
Boosted at 0? Water heaters 1, 2, 3, 4 ゜5
The water is heated at fr, and the pressure is increased by high pressure 1) J water pump 13.

Furthermore, the boiler 7 in the furnace is heated to 1k heated by the feed water heater 6.
is sent to become steam. The steam generated in the boiler 7 is worked in the turbine 8, enters the straw waterer 9, and is circulated in the same system to the watered trowel. The feed water heaters 1 to 6 are heated by the turbine bleed air and the drain from the feed water heater one step above, and the drain generated in the ridge itself is heated by the drain from the feed water heater one step downstream.
;1 Dirty water is poured into the water heater.

21s<l is the conventional water level that is used urgently in the system shown in Figure i'i1.1! In the system diagram of ti control device〆1, 'r
'F) shows part of the feed water heater control circuit connected to the feed water heater drain system. In the same figure, the feed water heaters 2 and 3 heat the feed water 16 with turbine oil ◇t14, 15 and the h1 water heater drain 2 (27) on the upstream side, and the feed water heater 2 heats the feed water 16 with the water heater drain 2 (27). 25 is sent to the feed water heater 1 one stage downstream for heat recovery). Feed water heater 2. 23 drain water level is measured by water level detector 17
, 18 (■ name water level indication 1t11-1 excavation 1g
, 20 C) is given, but the water level indication g: (# Ni
i '4t 19, 201□: 1-4 & out)), place'
d: ! Compared to t'e list price, "1. Sky change] Kaibe It
21 s In 22, output Section 1 (+II, 4th edition, and change the tempering izu 123, 71ii of 24. TaJ
It will be L.

In addition, a branch path is provided at the upstream [11+ of key 1111g p2: (, 2 = 1], and a bypass line is formed to reach 7t (power water i4r: 9), but this fl, i:1 water level Drains of feed water heaters 2 and 3 at the time of different irises ++'t, Jg
Revised) Acts to release water to Suiseki 9.

The control block applied to the Itodomari light in Fig. 31 &J, 'r'11, 2 is the control block [N1]. Same, in 1,
The deviation between the drain water level of feed water heaters 2 and 3 and the setting candy is FJ
') 141'j total 19, 211') becomes the fli control signal, which is determined by the characteristics of III, the sudden transducers 21, 22, and the control valves 2:3, 24? r
i! l: jlJjl valve actuation 4 pieces 28, 29 i 1
i-11jiteB"A, b (1 valve 23, 24) Kt
Its', K C1,':l;;+.

As a result, the drain flow ft 25 t 2 (3) is determined by the flow of the control 141 valves 23 and 24 (modification gain 0.; Drain 26, 27 !Ai: On and turbine sleeve body 1
4 and 15 are added, and the water level of each drain tank 32 and 331C of the feed water heater 2.3 is determined. In addition, Noh's h., 1 Suikakokuro: AI, 4
, 5.6 as well, the I indication η',' 71 (G'2.
'! jili shun 1j will be held.

[Problems with background technology]

However, in such a system, in order to keep the drain water level of the feed water heaters 1 to 6 constant due to load fluctuations of the turbine 8, etc., the control valves 23, 24, etc. There is a nJ problem in which the drain level flowing into the downstream side fluctuates, and the drain water level of the feed water heater is affected by the lower level. In particular, at the feed water heater on the downstream side, 'J'li + i〈l汐ir□1
・Compared to F... Drain hole coming in from the upper level training.
There were many. The response and stability of this system are as follows:

[Parameter 14 of 9] The present invention υ], Part 1, 1f) The purpose is to solve the problems of the prior art and to provide a water level control device with a small scale of responsiveness and safety. do.

[4th aspect of the invention (, Cao)] In order to configure the above, in wood 51-light, 1. A feed water heater with a number of rice grains of 11.".1 which is placed out of place in the water supply system of the boiler. Rei: Turn around, the water level along the water heating in each state ([exist] out, lower b1.

1. Water supply power 11 The control 111 means to control the drain 111 that is sent out during the heat cycle for 1 time is determined by one performer. upstream (
Water level il1 flowing into drain 1, 1 of Ill feed water heater
By providing the 111 valving bow and having the advance control 1iil element, it is possible to prevent water level fluctuations in the water supply heater (iii) from affecting the water level in the downstream water supply water heater j16. There is.

[4I) 16th Example of the Meiji Dynasty] Hereinafter, examples of the Honzu & Meiji examples will be explained with reference to the accompanying drawings.

4th ;'+ +- Makono fruit 111 cases Vko・1. 91 width "f" of the water level control device to be taken, and the same number as in the above-mentioned Fig. 2 indicates the same starting point as the center.The difference from tj' in Fig. 2 is f: J, + :”l 14'l valve 23 +2
Detects the opening 111 of 4 and performs
Therefore, it was added to the control number 1148 of the downstream 111i1 feed water heater and was regenerated by 1.

In such a configuration, upstream 11111 water addition kA TJ
The lift (i.e., the opening 1) of the successor valve 24 of 3 is detected using a body shimometer, etc., and the water level fluctuation of 1 [11i introduction water addition M θ 2] due to the shoulder entry of the drain 726 is detected. Performance 1r: The bell will ring at i35 in order to eliminate the problem. This calculated value is the downstream (ill sieve -, -+71 water level indicator bar of heater 2)
? In fi request iT'1'19, control ri11+ f,
Add to No. i 9-S] L, rack threader 2j and control valve 2
3 further down the drain;
Add water to the upstream side! 1 (S't*3 drain change mb can prevent the downstream side feed water heater 20 drain water level from being affected.
, Section 1: The opening degree of 11123 is determined through the calculator 34, and further T'? I11', 1llll feed water heater ÷ 1
By detecting 1 at 1, the control of the rotation I is carried out.

2↑S51...l &J, i'8 to 1,1;, is a +111 fill block diagram applied to the l system. Let G, (S) be the number of transmission intervals of I5 in 1 class. That's too bad, I set the pressure 29 of the control valve 24 of the upstream water heater 3 to 1/1/1.
1-1-'l', S, flow section 4 gain 3J all.

In the same phase, both IJ1 of the lower b1', capacity water supply, and S11 heating device 2
” rI′l f? of valve 23? t+*, dynamic characteristics 28 to 17
'l+T,S.

υ11 snoring gain, 3 () Shun, and so on. This j cup,
・If there is no thread including the old operator 35, and the drain to the lower 5IE side water supply heating unit 2 in the Kamodai, the state r5:i 'M and the flow h1- by the operator 35 are in agreement. ”-I. For this reason, Q'2, performance 11 instrument 35's transmission 'Funekant'=+
Qzs: Gs (S) t, 1, becomes] force i; i,
f i "ii・!I), r!, -j, that vagina 4
1.
Vessel 34's transmission・rl-'1] Number G! (S)&yo, becomes. stomach! 1, and here T, , 1-;-, one,
iJ and further downstream water supply d (time constant for vessel 1, bar I←?-) - fNf, +i'+gain.

As stated above, performance! :1.ぢ1134, +35
Function G2 ('') T 08 (S) 'f: By determining, the water 4d of the drain 26 of the water supply heater 3 is can be prevented from giving.

By applying similar control to all feed water heaters 1 to 6, the water level of the entire system can be determined. Near...: Keeping it constant is the DI ability.

No. 6 [10, Mizuko according to the real birj example of the song of the present invention) 7
H4l! In the configuration of the system 1 of the ≠ position, the point that is - (・) with the configuration of the 4th 1 is that the inputs of the input devices 34 and 35 are input to the 10 valves 24 and 24. . . . Instead of taking the control signal from the valve internal assistant, the control signal is taken from the water level indication adjustment drawing 20, . . . .

Figure 7 shows a > 1 (ili l applied to the system in Figure 6)
It is a l1Ji block diagram. In the block of FIG.
Member, a's (S). Here, the computing unit 35
Downstream feed water heater 2 where there is no string containing
If the amount of drain 26 to the drain 26 and the flow due to the balance rW 3 ri lρ -, the uppermost one is canceled out, then it becomes . The R' fortune teller 1. The transfer function G\(
S) is the upstream 1
11!1 Fluctuations in the water level in the water supply heater 3 reduce the flow of water in the downstream feed water heater 2 and at the same time indicate the water level; 1. ′, i kana 20 no control j
By inputting the i+11 signal to the arithmetic unit 34, it is possible to calculate
I(+: It is possible to increase the effect of time 1;p without using any means to detect it.

On the left, the water level of the lees and water adding device 2 and 3 is: ・+ 10
11 characteristics 28°29, the time constant T is 7 for the same plant.

and T S &! , (": +1 can be considered to be the same. Therefore, it can be simplified as before, (5), (6), de, 5, r, J-. Then, r = ,
Water supply power for all staff 1 and II (to vessels 1 to 6; l
, jj river (from C, it is possible to keep the water level of the entire system completely stable.

〔Effect of the invention〕

As explained above, the main part 1', the light part 11, the water heater's water supply temperature X'L according to the cargo change accommodation
If G2 moves, can you also consider the upstream 1jjll water supply heating city? I”):, 'jl') Means water level?Opening of the old i-section valve LJj:t: or dividing 1 line, lower bIC tsukuda water supply g'i screw:: wholesale valve 11 (means) water level measure f1
1. By adding this in addition to the above, it suppresses vertical fluctuations of the water heater for all threads, increases the consistency of water, and improves the water level Hj1. Water level 1 that can improve responsiveness
1i11 i wholesale/dedicated 1 self can be obtained.

[Brief explanation of the drawing]

Figure 1 shows the well-known 40'i';
j system diagram, Figure 3 is a control block diagram of the system in Figure 2,
FIG. 41 shows a system A of a water level control device according to an embodiment of the present invention.
hlx knee i, ♂Psl? 1illω11 block diagram applied to the system of lldsu41];
ll Ministry 11 device 1・'i system 1<1,',;'117
The figure is shown in Figure 6.
ili, l block 1 sol).・1 to 6...Water supply device, 8...Turbine, 9...
・Condenser, 1.7.1.8...Water G, r detector, river,
20...Water level indication ti+,', I clock, 21, 2'
, shi...Tunkuuga 1 vessel, 23, 24... control valve,
34゜ "A5..., 1 ji + 31 I, poem. 114 Applicant's agent Inomata 71v No. 1 Fig. 2 Fig. 3'#14 Fig. 5 Subaru 6 Fig. 7

Claims (1)

[Scope of Claims] 1. I placed in series in the water supply system of the boiler.
(J Several feed water heaters and the water of each feed water heater are detected and the drain switch sent to the -F flow ()ill's water supply e4'y 6n is controlled 7t1 + 1) 1 A flill fdJI means for adjusting the opening degree of the valve and one on the upstream side.
Operator 19'' and 'tcf' which apply a signal corresponding to 11 water hn heater drain-(it to the control hand 1)
2.4! #'l - In the wheeling according to claim 1, the means for controlling the water level adjusts the signal corresponding to the drain. Water level control device 1 that detects the opening of a valve and controls the water level.
°r+''. 3. In the device according to claim 1,
Shading 1? The means corresponds to the drain piece 1: (to the water level control device 1 in which the f4 is borrowed from the output No. 11 of the control means.