DE1776200C - Control device for steam turbine systems with single or multiple reheating. Eliminated from: 1401447 - Google Patents

Description

1 77t 2QQ

Control and interception valve or the control and discharge line to the bypass station UL arranged Urnleit-

control valves until the degree of closure valves regem and d? e the reheater pressure

of the interception valve or the interception valve with this interception valve AV in line c to the low pressure

Setpoint matches. This measure has provided the part of the turbine.

Advantage of lower accuracy requirements on the 5 In the circuit diagram is the path of the working damper

Measuring and control devices, because they are generally represented by a dashed line, waörenamii

smaller measured variable corresponding to the signal DU with a dash-dotted line the path of the uoer-

JäiU represent greater absolute accuracy than the production steam, also called diversion steam,

the measured variable corresponding to the signal Dl is illustrated. .

The amount of bypass steam per z * iieinneii is determined by the control device according to the invention

The technical progress achieved consists in particular and the amount of turbine steam per unit of time

^{in that a real reheating} pressure measured, and the measured values tu f, l ect " ^sc ° ^e - ^ ^lgn n _r ^e _r

regulation takes place by converting each of the intermediate; the corresponding signals new υυ

Superheater pressure measured, with that from the boiler and Dl. The signals DU and Dl are un ^ umm-

compared to the target pressure generated by the amount of steam and added up to 15 Formers I. The result, the signal υ l plus υυ

In relation to the control deviation, the associated conversion serves as a reference variable for the setpoint of the

pilot valve is adjusted. In addition, every intermediate intermediate to be regulated by the diversion station UL

superheater emptied only in the U.afang, superheater pressure, on the other hand, together with the

how the boiler steam production goes back, ie, there signal DU, for the formation of the ratio

there is less storage steam from the interim 20
superheater or reheater in the

Overheating in the

Condenser emptied when the boiler, e.g. B. after Dl + DU

a load shedding, not back to the same extent. . ,

is driven like the turbine. in quotient generator II. This ratio is the

It is also the low-pressure part of the turbine a ₅ setpoint of the degree of closure of the intercepting valve A K, the

for fast loading within the overproduct from the ratio converter l / W through slow subsequent

tion operation ready without affecting its gear ratio brought about

profitability takes place. A chocolate will ensue.

tion of the high-pressure part of the turbine, since the re-As a pulse for the degree of closure of the diverter valve

pressure part of the turbine immediately at the load increase 30 or the interception valves AV is according to the invention

involved. The high-pressure part only closes in the range of the quotient bypass steam volume per unit of time

men of his performance share are more heavily burdened. He should have boiler steam volume per unit of time or one of this

otherwise take over the entire additional service, with quotient derived value selected, including the

Its share of the total output is determined by the translation converter UW use

speaking would change. 35 denotes the stroke ratio between the interception and

An embodiment of the invention is in the control valve or the interception and control valves A IK,

DargesteUt drawing and is continuously adjusted in the following description RV in the manner in Dall

wrote: for each set transmission ratio this valve

The evaporator part of a boiler is named with AT, groups simultaneously reach the closed end position while the associated main superheater 40 is reached with HÜ. Without bypass operation, the degree of closure and, with CLOSED, the associated reheater is equal to 0, the interception valve is AV or the interception is displayed. HD is the high-pressure part and with valves are currently fully open, and when the ND Niedi; rdruckteil indicated the turbine. To close, the interception valve AV begins together with the reheater ZU lead two feed lines, and with the control valve RV or the interception from the /// »part of the turbine, the line α and 45 valves together with the control valves, the subsequent high-pressure reducing station RSt the line b, movement. Since the boiler load does not change for the first time during the reheater from line c to, the bypass operation now begins. If the low-pressure part of the LP goes off. From there, the steam is now reduced to the boiler load, thus reduced to the condenser. If there is two intermediate superheater pressure, on the one hand, because the superheating is between the first and second 50 setpoint pressure of the reheater pressure control to-reheater, a further diversion station moves forward; on the other hand, the diversion quotient increases, but the following description increases the amount of steam per unit of time Boiler steam quantity per, for the sake of simplicity, only depends on a simple intermediate time unit. The Abiangventil or the interception overheating dte speech. But there are al'e versions valves AV open, with the power distribution mutatis mutandis to machines with multiple 55 to the individual turbine parts for high pressure HD reheat. and low pressure LP changes only a little. If against

Furthermore, in the following the generator and the boiler load are not reduced with G, then

with ÜW a translation converter and with RV that remain the interception valves AV and the interception valve

Control valves and with Λ V the interception valves are named. in the throttled position and the power

In each of the ίο outgoing from the reheater ZU to the high pressure part HD and the low

Lines are installed valves, wherein in the druckteü ND of the turbine remains constant.

1 sheet of drawings

Claims (1)

€ 1 77> 200 ι superheater pressure is greater than the minimum intermediate Claim: superheater pressure, the interception valve fully open. at The conventional control method thus arises Control device for steam turbine systems with the intermediate superheater pressure corresponding to the steam single or multiple intermediate superheating, 5 throughput of the turbine. The resulting with a diversion station or several diversion emptying of the reheater with load shedding stations, a control valve or several control valves brings the disadvantage of a disturbance variable on the TemventÜen, an interception valve or several temperature control of the boiler, since the Uampffangventilen and one of the Control of the output of the reheater by the released catch valve or the intercept valve serving io storage steam volume is larger. Furthermore, the translation converter, characterized by emptying the reheater an additional sign η e t, means that the measured variables bypass loss because the steam in the condenser is knocked down per unit of time and turbine steam. Another deficiency is the increased quantity of signals DU, which is proportional to the time unit, and the load on the bypass station, pipeline and Dl for turbine and bypass control in four diverting devices and the condenser, are used so that DU and Dl are added to a totalizer by increasing the steam to be diverted ( T) added as a lead quantity. size for the setpoint pressure of the By-pass station (UL) to be regulated intermediate overristic is above low load a quick rental heater pressure is used, and that the ratio created by ao stung increase at the low pressure part not even then a quoüentenbiidner (II) is possible, who η the current steam generation the boiler would allow this in itself (this hä gt DU ultimately depends on the throughput of the turbine The intermediate superheater setpoint made by the γ DU and the one already made as before the load increase open interception valves collect the translation converter ( ÜW) as the setpoint). The lack of controllability of the downshift, which the transmission ratio pressure part of the turbine must through the high pressure to! between the control and interception valve or the are balanced and therefore easily leads to sched-control and interception valves (A K) readjusts so long, borrowed overstresses, especially at the degree of closure of the interception valve or the last high pressure stage. In the event of malfunctions, intercepting valves (AV) correspond to this setpoint - impermissible pressure increases in the reheater are correct. cannot be excluded from the known regulation be regulated because no real regulation of the intermediate superheater pressure is carried out. The rub 35 management therefore does not have the function at the same time 35 g The invention relates to a control device of a second, before the safety valves on for steam turbine systems with simple or more effective protection against excessively high multiple reheating, with a diversion station for superheater pressure, what from the safety-related or multiple diversion stations, from a control valve standpoint is a disadvantage. or more control valves, an interception valve 40 The invention is based on the object of a or to create several interception valves and one of the control devices that avoid it tion of the interception valve or the interception valves serve to overload the high-pressure part of the turbine the translation converter. allows the turbine to be ready for immediate It is the regulation of a steam turbine system with load increase during the bypass operation in one Reheating and bypass are known to increase 45 levels, as this without impairment (Magazine »Brown-Boveri-Mitteilungen«, January / Spring - the profitability of the plant is possible. It should bruar 1960, issue 1/2, pp. 19 to 26), in which the parallel boiler is as unaffected as possible by load shedding Operation of the turbine and bypass, d. H. be in excess and can be driven at will. Further Production operation, for example when starting up, or should the regulation meet the needs of one at the same time after a shutdown, the cross-sectional second protection against excessively high reheater ratio at any time meet the low-pressure to high-pressure bypass pressure. valve is kept the same as the ratio of the cross sections of the turbine interception valves to the sum of the initially mentioned type according to the invention thereby the cross sections of the high pressure control valves in steam turbine systems. Solved by the fact that the measured quantities bypass steam volume, apart from special cases, is achieved by the fact that in the 55 per unit of time and amount of turbine steam per time reheater, each partial flow, ie signals DU and oil proportional to and through the turbine through the bypass unit, considered individually, the same turbine and bypass control in such a way has intermediate pressure, which has the consequence that the influxes are drawn, that DU and Dl add the steam quantity distribution in a summation circuit of the bypass, as a fueling variable for the set pressure through high-pressure and low-pressure turbines not 60 of the affected by the respective diversion station. In this known regulation, the reheater pressure is used, and the reheater pressure is not regulated, but rather sets the ratio formed by a quotient generator by itself according to the known one Position assignment between the bypass valve, the W High pressure reducing station, the interception valve and 65 Di-Y DU
Ijen control valves. During the rerouting operation, this is known to be connected to the translation converter as a setpoint value th plant, with the proviso that the intermediate is that the transmission ratio between the