JPS60201009A - Operation of reheat steam turbine plant - Google Patents

Abstract

PURPOSE:To keep the thermal stress of the rotor of high-pressure exhaust stage and the strength of blades at a sufficiently safe level by increasing the flow rate of main steam beyond that of reheat steam during the no-load or low-load period of a reheat steam turine. CONSTITUTION:The error signal DELTAN of set revolving numers 30 and actual revolving number 31 is multiplied by an intercept valve constant 32, a lower limit valve constant 33, and a main steam stop valve constant 34. By a function generator 38, the flow rate ratio between the main steam and the reheat steam is obtained from the main steam temperature 36 and the reheat steam pressure 37. The flow rate of the main steam is increased beyond that of the reheat steam during the no-load or low-load period of the reheat steam turbine, and as the reheat steam turbine becomes of high loads, the flow rate of the reheat steam is allowed to approach that of the main steam. The thermal stress of the rotor in high-pressure exhaust portion can thus be reduced, and the strength of the blades, etc., of high-pressure exhaust stage can be sufficiently kept.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a method of operating a reheat steam turbine plan 1 to The present invention relates to an operating method for the reheat natural air turbine bypass 1.

[Technical disadvantages of the invention (1 and its problems) J3 is used in thermal and nuclear power plants, etc.
The steam generation source such as a furnace is kept in a constant operating state by a single power system, that is, a turbine bypass operation system is adopted.
There is.

g', that is, this turbine bypass) Sub-11v, Type 6 is a low load or stoppage of the turbine] 11 (Well, the excess steam is bypassed through the turbine while keeping the amount of steam generated by the boiler 79 constant -C condensate It is a method of collecting in a container, and in recent years,
It is used at many power plants to flexibly follow power load fluctuations during the day and night.

This turbine bypass operation increases the continued operation of the boiler.
+L capacity is 1J, so at night when the power demand is low, the power of Kujin is 1. 2. () between starting 11'1 or C. Also, turbine I-li 7' l+, 'l or negative (-1 h...
11.1 after the start of LI turn +
1. 'Is it to try to reduce the 71 (] between 1? (Saru.

Figure 1 shows a reheating hot air turbine 1- consisting of thermal power.
9, Soil hot air stop valve 'IO or (3l-R3 atmospheric pressure valve bypass valve 11 to bypass dirt, and steam power 1
U if'% Moon Turbi Turbine 2 Heshi 9° then C', 1 Yo hot air J'? Iru Atsushi Neruni 1
゛-を'f, :! After hitting the red turbine 2, 111 air was generated from the high pressure turbine 2.
JIIll air reverse 11 - Pass through valve 13 and reheat pipe 14 for low 21 items
It is guided through the Boiso 11\ mountain and heated again. This I
Ij heat and λ air due to high temperature internal heat pipe 16? "l Heat stop valve 1
7J5 and interlobe 1 through valve 18 or interhib 1 to valve bypass valve 19, it flows into intermediate pressure turbine 3, and the effective thermal energy is led to the turbine 11 and is introduced to the turbine 11. Techniques are applied to the turbine.
The water is collected and used as condensate.

In this case, it is 1 meter for the target <r fever recycling (Harr
Pamesystem Ll, +:'u IIJ3 J, Hilc
l-1U) 2-)'s system is J, Su (1''+1 is made and C is 36! I41 I, 10R5 Ki 11.Mebr
100), 12f + CI in this part, Irunki t',
9J, ri branch, high angle bypass device 11) 1 Go, J, Rii! Mr. 1 (in'I)
l'J u,! j” (1'l to rl 1)iL
Li, >1:':+ 11 By bus twin? 2nd, circular hole 1111 5t 'I 7 no 1 () 1 death El;
iJ, 1i (high drawing 1 mountain!) 1'~1 (3J, 11 support, 1 generation 1 + bypass bar 1゛20 J, sud・j
,) 1 and further desuperheater? 1 (, 2 J, reduced (product) (Condenser 0 (5 times 11y, low j1 Harasunoin J3 Dokarai 1" 11 formation 81shi (1, this J, do not use the eel system suit) Tahin Bypass Ren ij7;
(Has been 1., z, /i kika high 11 since before Kujin started.
Low through bypass twin 22 (1111 Yamanetsu T”,'
1/l'\Inflow a), and 11] The hot fish air flows into the low temperature tank 23, the desuperheater 21, and then flows into the vessel 6.

As a result, the high-pressure bypass line 22J5 and the low-angle bypass line 23 have a steam pressure of 41, and the bypass system is connected to a plant where the bypass system is not affected. .

In other words, in this case, the 41 mountain thermal steam turbine blunt C is in a negative state when the air pressure is high (the C terminus is activated). In the non-negative state (i, L, the steam h1 passing through the high-pressure turbine 02 is determined (low + rH 3, as a result, the ^pressure + Jl stage vanes rotate J, ru I! I! l Lost, λ0 temperature Iu, 1rf? L, "5 (1) Heat 11) Kafe (
14, IJ l% Nidenj bait, 14411II7
．． There is a problem of subtracting the body's li+a degree by "-5"?8.

So, these days the height is 7414.11 culms 1μ j
``There is power in the world,'' and furthermore, this phenomenon is
There is a problem with J.

Such t'? 11. I-j1ki 7Ka II's first impact is extremely steep, 1] 1 to A-buster 1 (is the main 7.I toki stone I of turbine ventilation 11. High LIE 4) 1 temperature melon is absolutely su・j11 white (b
It's quite a bit of a bit of a bit of a bit of a bit of a bit of a bit of a bit of a bit of a bit of a bit of a bit of a bit of a bit of a bit of a bit of a bit of a bit of. This results in high 1±IJI
Kidan 1. The resistance to the thermal stress of the computer, the strength of the blades, etc. becomes more severe.

However, the temperature of this high-pressure air is greatly influenced by the flow ratio of main steam and reheated steam, J, and the resiliency of the hot air.

2nd I;i] is the heat output steam 1" and power on the horizontal axis, and the vertical axis is HAHA IJI qc crystal 1, and the jf-force of the heat generated is 1.
” pressure [11 ki? : Shows the relationship with lli degree. In the figure (13 (song 1! 1! a, 11, C1 veer away from the main R air and i14) which flow of hot air, the tllI ratio is 2:'l
, 3: I J > Yohi 4:1 / x case is made small It is clear from the 9° diagram l) l J, sea urchin, fever Moon-1.11 Ki?
Akira 1 tool or 1-affect, ma/= ,', I it and λ・
j ril j heat steam? , 1 gori'f /JV more culms+”:!+ I-+1 Ikein Akira I student or 11 kunatsu (
go),.

Figure S3 shows the relationship between the turbine negative 6・I and the high pressure IJI air 11σ, with the turbine ventilation axis on the horizontal axis and the axis 111 + iXI on the axis. As shown in Figure 2, the main steam and IIf thermal steam flow ω ratios are taken as shown in Fig. , due to turbine losses, Juru culm, Rinawara,
The main steam dj J and the reheated iA air are increasing, and the heat generated by the windage is cooling down, and the air temperature is decreasing.

As is clear from FIGS. 2 and 3, the larger the flow rate of main steam to the reheat steam flow, the more suppressed the rise in high-pressure exhaust temperature can be.

[Object of the Invention 1 The present invention has been made in response to such conventional circumstances.
This prevents the rise in high-pressure exhaust temperature that occurs when starting the turbine from a turbine bypass operation state, that is, a state where the pressure of main steam and reheated steam is high, and prevents the thermal stress of the rotor of the high-pressure exhaust stage, the strength of the blades, etc. There is a method for operating a reheat steam turbine plant that can maintain a high level of heat.

Summary of the Invention] 1. In other words, the present invention provides a high-pressure turbine driven by main steam led from the boiler through a main steam pipe, such as a boiler having a reheater, and an exhaust gas from the high-pressure turbine that is A reheat steam turbine driven by hot steam led from the reheater of the boiler through the high temperature reheat pipe, and a reheat steam turbine branched from the main steam pipe and bypassing the high pressure turbine. A reheat steam turbine plan comprising: a high-pressure bypass line connected to the low-temperature reheat pipe; and a low-pressure bypass line branching from the high-temperature reheat pipe, bypassing the reheat steam turbine, and connecting to a condenser. In the operating method, the flow rate of the main steam is made larger than the flow rate of the reheat steam when the reheat steam turbine is under no load or at a low load, and as the load of the reheat steam turbine becomes high, the flow rate of the main steam is increased. This is a method of operating a reheat steam turbine plan, characterized in that the flow rate of the main steam is brought closer to the flow rate of the main steam.

[Embodiments of the invention] The details of the present invention will be explained below with reference to the drawings.

FIG. 4 shows the basic blocks and locks of the electro-hydraulic control device for carrying out the operating method of the reheat steam turbine plan of the present invention. An adder is shown which inputs and outputs an error signal ΔN. This error signal ΔN is multiplied by an intercept valve constant 32, a lower limit valve constant 33, and a main steam stop valve bypass valve constant 34, respectively, and outputted to an adder 39b as a valve opening degree control signal corresponding to a predetermined speed arbitration rate. Load setting signals 1-a and lb from the function generator 38 are applied to this adder 39b.

Meanwhile, the function generator 38 uses the setting ff1Ls from the load setting device 35, the main steam temperature 36, and the reheat steam pressure 3.
7 is input, and the load setting value La to the intercept valve bypass valve 19 and the load setting value 1b to the main steam stop valve bypass valve 11 or the steam control valve 12 are output. A bias signal is applied to either the full-circle injection (FA)/partial injection (PA) switching device 49 to the main steam stop valve bypass valve 11 and the steam control valve 12, and the control by the main steam stop valve bypass valve 11 or Control by the steam control valve 12 is selected.

On the other hand, during transmission of the control signal for the intercept valve bypass valve 19, the relay 42 is closed by the intercept valve control end signal 41, and the full open bias signal 40 is applied to the adder 39d. The control signals for each valve to which the load set value is applied are each intercepted by an intercept valve position control loop 43;
The signal is input to the control valve position control loop 44 and the main steam stop valve bypass valve position control loop 45, and the opening setting signals for each valve are output from these control loops. The actuator 47, intercept valve, and intercept i-valve bypass valve actuator 46 are controlled.

That is, in such a control device, the function generator 38 inputs the main steam temperature 36 and the reheated steam pressure 37 during operation, calculates the flow rate ratio between the main steam and the reheated steam, and calculates the flow rate ratio between the main steam and the reheated steam. The value of the load setting value LS input from the load setting device 35 is changed based on the value of the flow rate ratio with steam. Here, the function generator 38 determines the flow rate ratio between the main steam and the reheated steam based on a graph (not shown in FIG. 2), with the high-pressure exhaust temperature allowed by the structure of the rotor, blades, etc. as the limit.

However, Figure 2 shows the relationship between the pressure of reheated steam and the high-pressure exhaust temperature for a constant main steam temperature.
K + Ruka, 10 ni mi ki? :+A melon? Almost the same screen appears when the temperature changes to I+, and the temperature of the soil vapor changes. J,suI+,! b letter +1. - %, 1 Let the flow ratio of the heat output steam be j' (Saru).

Below 1. Statement A: /JlIll (-TJ SekigR Hikari i1
ii! i 38 Ni, I, Rishu l to Kidoyama) An example of comparing Ryu III with Zenki (Rough C explanation) Goka, Boino=I; J, Hitajin's activation QSi l! I]; Me Jl [Constant C monkey l, i case, etc.) Figure 5 shows small 1 JJ, sea urchin, main steam mountain; 44j 71'; , ct itil 1-IQ
a j]/Jl horn r16i+ J
t I + white chisel + t J, ilJ 1- je3 fever 1t'! + Air flow lij ratio 1. There are 1 and 11 things that happen.

In other words, ') 3 The J diagram has the terminus on the horizontal axis and the negative number on the vertical axis (
Jfu43 airflow) i (small b's (, song Kiri is the main! airflow! 1i4 song ￥C, + I+ is fever, '7b airflow and -
'I'J 1. , Figure 0 (,
l Less example C is the example [,LJ1((negative i °fil11,
j / Jl t et al. L S 1 ;l, (゛most b +
','s r+ III Qi 2Aa 1. u is +! 76
<Is that what you mean? J';J! ηJ shown in diagram C1,
U IJ, this 1-3 IJ, (1f: Jl flow tA stage setting (j4 "I, main steam]]) Me valve bypass valve 11 or (
21'J, the sea urchin C is flowing. 1-sl or more? Is the amount of steam increased?
[Respectable class rf/or 1 respectable/, for j,” f! l
Air and heat steam flow Id ratio', r 1 : I
L: F”i If-'+near(-J(])sui fixed negative inquiry 1
-C setting to 32 (, ``l visit I 1 □ 1 shi I-S or A main h3 ki Ji J, hirtJ hot air flow Hn Ll) 1
+Q constant'rl toshi (') x.

It will be done.

C Interval U) °1 Valve high hub;゛l5)
d: + or Nori i 'zil f, 2 (=:1i,:
f '; According to Article 9 fl - rinter e throat valve; 11
ritohiragi''i1 □shiji41 is output, relay/12 or f'1 is activated, r jitareno 1~valve 1 is heard, □shishika mark 1111 is output, and J and reinterreno 1 are output. ~Br is fully opened, and JJ LJ control 2 in the first part
11 is performed and 1', :1. It's good to change it> (A81- only; Q redundantly for 11 requests).

(Efficacy of Excuse Song Dynasty) As mentioned above, the method of operating the 1jJ thermal steam generator of the present invention C is 7 of the ``rl'' thermal steam generator.
1! ! (The main air flow tli is increased to J or low load 11.1, 74i 71% air flow ■ Niri is also increased,
As the b'l load of the heatable steam turbine increases, l
j Ill, the speed of the hot air flow is close to the main φ air flow j7i,
J number] Tano'C, Q? The high 11 j that occurs in the low burden on j
J+Jl1 Ai no Uoshi? It is possible to suppress the high pressure jJ
I part U) 1. Reduce the thermal stress of your computer by 1 (high)
) 1) Maintaining the margin of blades etc. in 1 stage increases the efficiency and greatly improves the reliability of the turbine.
J or C monkey.

[Brief explanation of drawings]

Figure 1 shows the piping system diagram for the heat output steam terminal, A (Figure 2 shows the pressure and pressure of the heat output steam, J': + Ill: +
Are you worried? What is the relationship between quality and small (J Kunono, 2nd) diagram +, L tarjin O (+: + dor! + 711JI Ki 1i 141u
, which relation k small rig 7), the urlI diagram is 4-斤明ノ°
, the law is valid/, : Example 4' of the fl+ control 11 path, small grid diagram, Figure 1. L J steam flow tf
1 and 1 front claw/airflow 1 - Which setting example is small rig horn (there is. 1......Hoino 2...lj'!l E-terbisitter
Bin 3...Intermediate pressure turbine 4...
...1 generation)-1 turbine 9...
・Main steam pipe 10... Main steam stop valve 11...
...Main steam stop valve bypass valve 12...
......Steam control valve 14...
...(1 (Note + lj heat tube 15...
, January - Bypass Fin i G...
・High (crystal tli heat color 17・・・・・・・・・Meat heat bu?18・・・・・・・・・Interreso 1~Br19・・・・・・・・・Inter Ll1-B?High Hasb1゛22...1!'!+ I+Bypass Twin?,3......(1(+, i-bar r bus twin fee Jjil person b i J, 'i' l
9f III:1〕1Figure 4

Claims (1)

[Claims] (1) A boiler having a reheater, a high-pressure turbine driven by main steam led from the boiler through the main steamer, and exhaust gas from the high-pressure turbine being led to the reheater (
a low-temperature reheat pipe, a reheat steam turbine driven by reheat steam led from the reheater of the boiler through the high-temperature reheat pipe, and a reheat steam turbine branched from the main steam pipe to bypass the high-pressure turbine. - (a reheat steam turbine plant comprising a high-pressure bypass line connected to the low-temperature reheat pipe; and a low-pressure bypass line branched from the high-temperature reheat pipe, bypassing the reheat steam turbine, and connected to a condenser; In the operating method, the flow rate of the main steam is made larger than the flow rate of the reheat steam when the reheat steam turbine is under no load or at a low load, and as the load of the reheat steam turbine becomes high in the negative direction, the reheat steam turbine is Contribution to Reheat Steam Turbine Plan 1!, Method, characterized by bringing the flow rate of hot steam closer to the flow rate of the main steam.