KR20190054736A - Apparatus and method for controlling steam flow - Google Patents

Abstract

The present invention relates to a steam flux control apparatus and method of a turbine and to a steam flux control apparatus and method of a turbine, which adjust the flux of steam extracted by a turbine to increase the output of the turbine and adjust the flux of cooled steam supplied from a steam condenser to a heater to protect the steam condenser. An embodiment of the present invention provides the steam flux control apparatus, comprising: a boiler generating the steam; the turbine receiving the steam and extracting a portion of the steam; a first valve controlling the flux of the steam extracted by the turbine; the steam condenser cooling the steam induced from the turbine; the heater reheating the cooled steam induced from the steam condenser using the steam extracted by the turbine; a second valve controlling the flux of the cooled steam induced from the steam condenser to the heater; and a control unit controlling opening degrees of the first valve and second valve.

Description

[0001] The present invention relates to a steam flow control apparatus,

The present invention relates to a steam flow rate control apparatus and method, and more particularly, to a steam flow rate control apparatus and method for controlling a flow rate of steam added from a turbine to adjust an output of a turbine, a flow rate of cooled steam supplied from a condenser to a feedwater heater, The present invention relates to a steam flow rate control apparatus and method for protecting a steam flow rate.

Generally, a turbine is a machine that converts the energy of a fluid such as water, gas, steam, etc. into mechanical work. It usually plantes several feathers or wings on the circumference of a rotating body and emits vapor or gas to it. It is a turbo-type machine that rotates.

The steam flow of the turbine is injected into the turbine at high temperature and high pressure generated in the boiler, the steam injected into the turbine is cooled through the condenser, and the cooled steam is reheated at the heater and injected back into the boiler. In addition, a part of the steam injected into the turbine is used as a heat source of the heater.

In this process, a valve for adding the steam of the turbine to the heater is installed. This valve performs only the opening and closing operation, so that the amount of steam added to the heater can not be controlled.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a steam turbine that adjusts the flow rate of steam added from a turbine to a feed water heater to adjust the output of the turbine, And to provide a steam flow rate control apparatus and method for protecting the steam flow rate.

Other features and advantages of the invention will be set forth in the description which follows, or may be obvious to those skilled in the art from the description and the claims.

According to an aspect of the present invention, there is provided an apparatus for controlling a steam flow rate of a turbine, including: a boiler for generating steam; a turbine for receiving steam and for adding a portion of the steam; A first valve for controlling the flow rate of steam added from the turbine to the feed water heater, and a second valve for controlling the flow of the cooling water from the condenser to the feedwater heater A second valve for controlling the flow rate of the steam, and a control unit for controlling the opening of the first valve and the second valve.

Here, the control unit reduces the opening of the first valve to increase the output of the turbine, thereby reducing the flow rate of steam added from the turbine to the feedwater heater.

In addition, the control increases the opening of the first valve to reduce the turbine output, thereby increasing the flow rate of the steam added from the turbine to the feedwater heater.

The control unit determines the flow rate of the steam added from the turbine to the feed water heater by the opening degree of the first valve and adjusts the opening degree of the second valve based on the flow rate of the steam added from the turbine to the feed water heater.

Further, when the opening degree of the first valve is increased to increase the flow rate of the steam to be added, the opening degree of the second valve is decreased to increase the amount of steam delivered from the condenser to the water heater.

In addition, the control unit increases the opening degree of the second valve to reduce the amount of steam delivered from the condenser to the feedwater heater when the flow rate of the steam to be added is decreased due to the decreased opening of the first valve.

Further, the second valve is disposed in a bypass pipe connecting a plurality of pipes connecting the condenser and the water heater, and a rotor connecting the water heater and the boiler.

In addition, the control unit controls the opening of the second valve so that the steam is not supplied to the feed water heater.

In addition, the second valve delivers a part of the cooled steam supplied from the condenser to the aspirator connecting the water heater and the boiler with the opening degree controlled based on the control signal of the controller.

The turbine includes a high-pressure turbine and a low-pressure turbine. The feedwater heater includes a high-pressure feedwater heater and a low-pressure feedwater heater. The first valve includes a high-pressure sprue and low- Pressure spur gears connecting the gears.

According to an aspect of the present invention, there is provided a method for controlling a steam flow rate of a turbine, including the steps of adding a portion of steam supplied from a boiler and transferring a part of the remaining steam to a condenser, Controlling the opening of the first valve to control the flow rate of the steam to be added, and controlling the opening of the second valve in the control unit to transfer a part of the steam cooled in the condenser to a sauna for connecting the water heater and the boiler , And reheating a portion of the remaining cooled steam using steam that is added.

Here, in the step of controlling the flow rate of the steam to be added, when the output of the turbine is reduced, the opening of the first valve is decreased to reduce the flow rate of the steam to be added.

Further, in the step of controlling the flow rate of the additional steam, when the output of the turbine is increased, the opening degree of the first valve is increased to increase the flow rate of the steam to be added.

Further, in the reheating step using the additional steam, the flow rate of the steam added by the opening of the first valve is determined, and the opening degree of the second valve is adjusted based on the flow rate of the steam to be added.

Further, in the reheating step using the additional steam, when the opening degree of the first valve is increased to increase the flow rate of the steam, the opening degree of the second valve is decreased to increase the amount of steam cooled in the condenser.

Further, in the reheating step using the additional steam, when the opening degree of the first valve is decreased to decrease the flow amount of the steam to be added, the opening degree of the second valve is increased to reduce the amount of steam cooled in the condenser.

In addition, in the step of reheating using the additional steam, the opening degree of the second valve is controlled so as not to supply the steam that has been cooled to a certain level to the water feed heater, and a part of the steam cooled by the controlled degree of opening is transferred to the rotor .

An apparatus and method for controlling a steam flow rate of a turbine according to an embodiment of the present invention can control the output of a turbine by controlling a flow rate of steam added from a turbine to a feedwater heater.

Further, it is possible to control the flow rate of the cooled steam supplied from the condenser to the feedwater heater, thereby preventing the feedwater heater from being damaged by the cooled steam.

In addition, other features and advantages of the present invention may be newly understood through embodiments of the present invention.

1 is a view showing a configuration of a steam flow rate control apparatus according to an embodiment of the present invention.
2 is a view illustrating a method of controlling a steam flow rate of a first valve according to an embodiment of the present invention.
3 is a view showing a modification of the steam flow rate control method of the second valve according to the embodiment of the present invention.
4 is a view showing a modification of the steam flow rate control method of the second valve according to the embodiment of the present invention.
5 is a view showing a steam flow control apparatus according to an embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art to which the present invention pertains. The present invention may be embodied in many different forms and is not limited to the embodiments described herein.

In order to clearly illustrate the present invention, parts not related to the description are omitted, and the same or similar components are denoted by the same reference numerals throughout the specification.

Throughout the specification, when a part is referred to as being "connected" to another part, it includes not only "directly connected" but also "electrically connected" with another part in between . Also, when an element is referred to as " comprising ", it means that it can include other elements as well, without departing from the other elements unless specifically stated otherwise.

If any part is referred to as being " on " another part, it may be directly on the other part or may be accompanied by another part therebetween. In contrast, when a section is referred to as being " directly above " another section, no other section is involved.

The terms first, second and third, etc. are used to describe various portions, components, regions, layers and / or sections, but are not limited thereto. These terms are only used to distinguish any moiety, element, region, layer or section from another moiety, moiety, region, layer or section. Thus, a first portion, component, region, layer or section described below may be referred to as a second portion, component, region, layer or section without departing from the scope of the present invention.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. The singular forms as used herein include plural forms as long as the phrases do not expressly express the opposite meaning thereto. Means that a particular feature, region, integer, step, operation, element and / or component is specified and that the presence or absence of other features, regions, integers, steps, operations, elements, and / It does not exclude addition.

Terms indicating relative space such as " below ", " above ", and the like may be used to more easily describe the relationship to other portions of a portion shown in the figures. These terms are intended to include other meanings or acts of the apparatus in use, as well as intended meanings in the drawings. For example, when inverting a device in the figures, certain portions that are described as being " below " other portions are described as being " above " other portions. Thus, an exemplary term " below " includes both up and down directions. The device can be rotated by 90 degrees or rotated at different angles, and terms indicating relative space are interpreted accordingly.

Unless otherwise defined, all terms including technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Commonly used predefined terms are further interpreted as having a meaning consistent with the relevant technical literature and the present disclosure, and are not to be construed as ideal or very formal meanings unless defined otherwise.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

1 is a view showing a configuration of a steam flow rate control apparatus according to an embodiment of the present invention.

1, a steam flow rate control apparatus 100 according to an embodiment of the present invention includes a boiler 110, a turbine 120, a condenser 130, a water heater 140, a first valve 150, 2 valve 160 and a control unit 170. [

The boiler 110 may generate steam. The steam generated in the boiler 110 may flow into the turbine 120. A valve for supplying steam to the turbine 120 may be disposed between the boiler 110 and the turbine 120. The valve may control the flow rate of steam supplied from the boiler 110 to the turbine 120.

The steam introduced into the turbine 120 can be used as an energy source for causing the turbine 120 to generate rotational energy, and the rotational energy can be converted into electric energy by rotating the generator. The steam discharged from the turbine 120 flows into the condenser 130, and a part of the steam may be sucked into the water heater 140. An additional steam generator 230 may be connected between the turbine 120 and the feed water heater 140 to supply steam to the steam heater 140. The spindle 230 may be provided with a first valve 150 for controlling the amount of the additional steam supplied to the feedwater heater 140.

The condenser 130 can cool the steam flowing in the turbine 120. The condenser 130 can reduce the steam that has rotated the turbine 120 to water through heat exchange. The steam cooled in the condenser 130 may be supplied to the water heater 140. A plurality of pipes 220 may be connected between the condenser 130 and the feedwater heater 140 to allow the cooled steam to flow into the feedwater heater 140. The steam cooled in the condenser 130 may be supplied to the feedwater heater 140 through the plurality of pipes 220 and the plurality of pipes 220 may include a second valve 160 for controlling the degree of opening and closing of the plurality of pipes 220, The amount of the cooled steam supplied to the feed water heater 140 can be adjusted.

The feed water heater 140 can reheat the cooled steam introduced from the condenser 130 using the steam added from the turbine 120. That is, the steam added by the turbine 120 flows into the feedwater heater 140, and the steam cooled by the condenser 130 flows into the feedwater heater 140. At this time, the water heater 140 can reheat the steam introduced from the water heater 140 by using the additional steam introduced from the turbine 120 as a heat source. The reheated steam may flow back into the boiler (110). In addition, the feed water heater 140 can return the heated steam to the condenser 130 for cooling. The water heater 140 may supply the steam heated by the condenser 130 to the water heater 140 through a separate pipe from the pipe 220 where the steam cooled in the condenser 130 is transferred to the water heater 140.

The first valve 150 may control the flow rate of the steam added from the turbine 120 to the feedwater heater 140. The first valve 150 may be a control valve capable of adjusting opening degree. The opening of the first valve 150 can be adjusted based on the control of the controller 170. If the opening degree of the first valve 150 is reduced, the flow rate of the steam added to the feedwater heater 140 may be reduced. Accordingly, the amount of steam flowing into the turbine 120 increases and the output of the turbine 120 increases . When the opening degree of the first valve 150 is increased, the flow rate of the steam added to the feedwater heater 140 can be increased. As a result, the amount of steam flowing into the turbine 120 decreases, .

The second valve 160 includes a plurality of pipes 220 connecting the condenser 130 and the water heater 140 and a bypass pipe 240 connecting the water heater 140 and the aspirator 240 connecting the boiler 110. [ (Not shown). The second valve 160 may control the flow rate of the cooled steam flowing from the condenser 130 to the feedwater heater 140. The second valve 160 may be a control valve capable of adjusting the opening degree. The opening degree of the second valve 160 can be adjusted based on the control of the controller 170. When the opening degree of the second valve 160 is reduced, the flow rate of the cooled steam flowing into the feedwater heater 140 can be increased. When the opening degree of the second valve 160 is increased, The flow rate of the cooled vapor to be cooled can be reduced.

The control unit 170 may adjust the opening degree of the first valve 150 and the second valve 160. The control unit 170 may control the opening degree of the first valve 150 for controlling the flow rate of the steam added from the turbine 120 to the feedwater heater 140 to be lowered have. Accordingly, the steam amount of the turbine 120 increases, and the output of the turbine 120 can increase. If the controller 170 determines that the output of the turbine 120 is increased, the control unit 170 controls the opening degree of the first valve 150, which controls the flow rate of the steam added from the turbine 120 to the feedwater heater 140, can do. Accordingly, the steam amount of the turbine 120 may be reduced and the output of the turbine 120 may be reduced.

The control unit 170 may control the opening degree of the second valve 160 to be greater when it is determined that a predetermined amount of steam is to be introduced from the condenser 130 to the feedwater heater 140. That is, the control unit 170 can adjust the opening degree of the second valve 160 so that only the amount of steam to be reheated in the water supply heater 140 flows into the water supply heater 140. Accordingly, steam exceeding a predetermined amount can be transmitted to the rotary shaft 240 along the bypass pipe 250 and the steam heater 140 can be prevented from being supplied to the steam heater 140, Lt; / RTI > Here, the steam passing through the second valve 160 and the steam reheated and discharged from the water heater 140 may flow back into the boiler 110.

For example, when the amount of cooled steam discharged from the condenser 130 is 100, and the amount of steam to be reheated in the water heater 140 is 60, the second valve 160 is operated to decrease the amount of the cooled steam discharged from the condenser 130 100 to the ash rotor assembly 240. [0064] Accordingly, it is possible to protect the water supply heater 140 by preventing the amount of steam flowing into the water supply heater 140 from exceeding a predetermined amount that can be reheated in the water supply heater 140.

The control unit 170 determines the flow rate of the steam delivered from the turbine 120 to the feedwater heater 140 by the opening of the first valve 150 and controls the flow rate of the steam flowing from the turbine 120 to the feedwater heater 140 The opening degree of the second valve 160 can be adjusted based on the flow rate of the steam.

Specifically, when the opening degree of the first valve 150 is increased by the control of the controller 170 and the flow rate of the steam added to the feedwater heater 140 is increased, the controller 170 controls the opening degree of the second valve 160 The amount of steam delivered from the condenser 130 to the feedwater heater 140 can be increased. As the steam added to the feedwater heater 140 increases, the feedwater heater 140 can heat the larger amount of steam using the additional steam. Accordingly, the controller 170 may reduce the opening degree of the second valve 160 to increase the amount of steam flowing into the feedwater heater 140 so that the feedwater heater 140 heats more steam. When the opening degree of the first valve 150 is reduced by the control of the controller 170 and the flow rate of the steam added to the feedwater heater 140 decreases, the controller 170 increases the opening degree of the second valve 160 Thereby reducing the amount of steam delivered from the condenser 130 to the feedwater heater 140. As steam added to the feedwater heater 140 is reduced, the feedwater heater 140 can heat only a small amount of steam using the supplemented steam. Accordingly, the controller 170 increases the opening degree of the second valve 160 to reduce the amount of steam flowing into the water heater 140 so that the water heater 140 can increase the amount of steam The steam can be prevented from flowing. Therefore, the water heater 140 can be protected by preventing the water heater 140 from exceeding a predetermined amount that can be reheated.

2 is a view illustrating a method of controlling a steam flow rate of a first valve according to an embodiment of the present invention.

1 and 2, the turbine 120 adds a portion of the steam supplied from the boiler 110 (S11). The turbine 120 may add a portion of the steam to the feed water heater 140. Here, an additional steam turbine 230 may be connected between the turbine 120 and the water heater 140 to transmit the steam to the water heater 140. The spindle 230 may be provided with a first valve 150 for regulating the amount of steam to be added.

Then, it is determined whether the output of the turbine 120 is decreased (S12).

When the output of the turbine 120 is reduced, the controller 170 lowers the opening degree of the first valve 150 (S13). When the output of the turbine 120 is reduced, the controller 170 may reduce the opening degree of the first valve 130 to reduce the amount of steam to be added. Accordingly, the amount of steam is increased in the turbine 120, and the output of the turbine 120 can be increased.

On the other hand, if the output of the turbine 120 is not decreased, the controller 170 increases the opening degree of the first valve 150 (S14). When the output of the turbine 120 is increased, the controller 170 may increase the opening degree of the first valve 130 to increase the amount of steam to be added. Accordingly, the amount of steam in the turbine 120 is reduced, and the output of the turbine 120 can be reduced.

The feedwater heater 140 heats the steam introduced from the condenser 130 using the steam added to the feedwater heater 140 (S15). In the feed water heater 140, steam having a controlled amount according to opening degree may be introduced into the first valve 150, and steam cooled in the condenser 130 may be introduced. The feedwater heater 140 may use the additional steam as a heat source to heat the cooled steam introduced from the condenser 130.

The steam heated by the feedwater heater 140 flows into the boiler (S16). The boiler 110 may be used as energy for supplying the steam introduced from the water heater 140 to the turbine 120 to generate rotational energy in the turbine 120. Therefore, the above process can be repeatedly executed.

3 is a view showing a modification of the steam flow rate control method of the second valve according to the embodiment of the present invention.

Referring to FIGS. 1 and 3, the turbine 120 supplies a portion of the steam supplied from the boiler 110 to the condenser 130 (S21). The turbine 120 may add a portion of the steam supplied from the boiler 110 and deliver some of the remaining steam to the condenser 130.

The condenser 130 cools the supplied steam (S22).

Then, it is determined whether the steam cooled in the condenser 130 is equal to or greater than a predetermined amount (S23). Here, the predetermined amount may be an amount of steam to be heated in the water feed heater 140, and may be a capacity to receive the steam cooled in the water heater 140, a capacity to heat the steam in the water heater 140 Lt; / RTI >

If the amount of steam cooled in the condenser 140 is equal to or greater than a predetermined amount, the degree of opening of the second valve 160 is controlled to transfer the amount of steam exceeding a predetermined amount to the syngas 240 (S24). When the amount of steam cooled in the condenser 140 is equal to or greater than a predetermined amount, the controller 170 can control the opening degree of the second valve 160. Here, if the amount of the cooled steam exceeds a predetermined amount, the control unit 170 may control the opening degree of the second valve 160 to be further opened. If the amount of the cooled steam is slightly exceeded, the second valve 160 ) Can be controlled to be slightly opened. The cooled steam may be delivered to the aspirator 240 by opening the second valve 160 and may enter the boiler 110 along the aspirator 240.

The water heater 140 heats the steam introduced from the condenser 130 (S25). The feed water heater 140 can heat the steam introduced by a predetermined amount by opening the second valve 160. In addition, when the steam cooled in the condenser 130 is not equal to or more than a predetermined amount, the cooled steam can be introduced into the feedwater heater 140, and the feedwater heater 140 can heat the introduced steam.

The steam heated by the water heater 140 flows into the boiler (S26). The boiler 110 may be used as energy for supplying the steam introduced from the water heater 140 to the turbine 120 to generate rotational energy in the turbine 120. Therefore, the above process can be repeatedly executed.

4 is a view showing a modification of the steam flow rate control method of the second valve according to the embodiment of the present invention.

Referring to FIGS. 1 and 4, it is determined whether the flow rate of steam added from the turbine 120 to the feedwater heater 240 has increased (S31). Here, the flow rate of the steam added to the feedwater heater 240 may vary according to the opening degree of the first valve 150, and the controller 270 adjusts the opening degree of the first valve 150 so that the output of the turbine 120 Can be adjusted.

When the flow rate of the steam added from the turbine 120 to the feedwater heater 240 is increased, the controller 270 decreases the opening degree of the second valve 160 (S32). When the flow rate of the steam added to the feedwater heater 240 is increased, the amount of steam that the feedwater heater 240 can use as a heat source is increased, and a larger amount of steam can be heated by using the added steam . Accordingly, the controller 270 decreases the opening degree of the second valve 160 to reduce the flow rate of the steam directly flowing into the boiler 110, so that a larger amount of steam flows into the water heater 240 So that it can be heated.

On the other hand, if the flow rate of the steam added from the turbine 120 to the feedwater heater 240 is not increased, the controller 270 increases the opening degree of the second valve 160 (S33). When the flow rate of the steam added to the feedwater heater 240 is decreased, the amount of steam that the feedwater heater 240 can use as a heat source is reduced, and the feedwater heater 240 can heat the steam using only the supplemented steam do. Accordingly, the controller 270 increases the opening degree of the second valve 160 to increase the flow rate of the steam directly flowing into the boiler 110, thereby increasing the flow rate of the steam that can be heated by the water heater 240 So that it can be prevented from flowing into the feed water heater 240.

The feed water heater 140 heats the steam introduced from the condenser 130 (S34). The feed water heater 140 can heat the steam introduced by a predetermined amount by opening the second valve 160.

The steam heated by the feedwater heater 140 flows into the boiler (S35). The boiler 110 may be used as energy for supplying the steam introduced from the water heater 140 to the turbine 120 to generate rotational energy in the turbine 120. Therefore, the above process can be repeatedly executed.

The present invention realizes an apparatus and a method for controlling a steam flow rate of a turbine that adjusts the flow rate of steam added from a turbine to increase the output of the turbine and protects the feedwater heater by controlling the flow rate of cooled steam supplied from the condenser to the feedwater heater .

5 is a view showing a steam flow control apparatus according to an embodiment of the present invention.

Referring to FIG. 5, the boiler 110 may generate steam by heating water with heat generated by burning fuel. The steam generated in the boiler 110 may flow into the high pressure turbine 122 through the steam pipe 210.

The high-pressure turbine 122 can generate rotational energy using the introduced steam. The high pressure turbine 122 may be operated by high pressure / high temperature steam delivered from the boiler 110. The high pressure turbine 122 may deliver a portion of the steam to the high pressure feedwater heater 142. The steam of the high pressure turbine 122 can be transferred to the high pressure feedwater heater 142 through the high pressure steam engine 232 and the flow rate of the steam delivered to the high pressure feedwater heater 142 can be supplied to the high pressure steam engine 230 A first high-pressure valve 152 may be disposed.

The low pressure turbine 124 can generate rotational energy using steam introduced from the high pressure turbine 122. The low pressure turbine 124 may be operated by relatively low / low temperature steam rather than the high pressure turbine 122. The generated rotational energy can be converted into electric energy by rotating a generator connected to the low-pressure turbine 124. [ The low pressure turbine 124 may deliver a portion of the steam to the low pressure feedwater heater 144. Here, the steam of the low-pressure turbine 124 can be transferred to the low-pressure feedwater heater 144 through the low-pressure feed pump 234 and the flow rate of the steam delivered to the low-pressure feedwater heater 144 can be transmitted to the low- Pressure low-pressure first valve 154 may be disposed.

The condenser 130 can reduce the steam that has rotated the low-pressure turbine 124 to water through heat exchange. The steam cooled in the condenser 130 may be supplied to the water heater 140 through the plurality of pipes 220. The plurality of pipes 220 may include a second valve 160 for controlling the opening and closing degree of the plurality of pipes 220.

The feedwater heater 140 may include a low pressure feedwater heater 144 and a high pressure feedwater heater 142. Pressure steam generator 234 may be connected between the low-pressure feedwater heater 144 and the low-pressure turbine 124 so that the low-pressure addition steam is supplied to the low-pressure feedwater heater 144. The cooled steam can be heated using the additional steam delivered through the low pressure sprue tube 234 as a heat source. The steam heated through the low pressure feedwater heater 144 may be stored in the water supply tank 180.

The heated steam stored in the water supply tank 180 may be boosted by the water supply pump 190 and supplied to the high pressure water supply heater 142. A high-pressure feed pipe 232 is connected between the high-pressure turbine 122 and the high-pressure feedwater heater 142 so that high-pressure addition steam is supplied to the high-pressure feedwater heater 142. The steam supplied to the high-pressure feedwater heater 142 may be heated using the high-pressure addition steam delivered through the high-pressure steam engine 232 as a heat source. The steam heated by the high-pressure feedwater heater 142 may be supplied to the boiler 110.

Unlike the above-described example, the turbine 120 is configured to include the high-pressure turbine 122 and the low-pressure turbine 124, but is not limited thereto. A medium pressure turbine may further be included between the high pressure turbine 122 and the low pressure turbine 124.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the following claims and their equivalents. Only. It is intended that the present invention covers the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents. .

100: Steam flow controller 110: Boiler
120: Turbine 130:
140: water heater 150: first valve
160: second valve 170:
180: Water tank 190: Forage pump
210: steam pipe 220: plural pipes
230: Extension engine 240:
250: Bypass tube 122: High pressure turbine
124: Low pressure turbine 232: High pressure impeller
234: low-pressure accumulator 142: high-pressure feedwater heater
144: low-pressure feedwater heater 152: high-pressure first valve
154: low pressure first valve

Claims (17)

Boilers that generate steam;
A turbine receiving the steam and adding a portion of the steam;
A condenser for cooling the steam entering the turbine;
A water heater for reheating the cooled steam introduced from the condenser by using the steam added from the turbine;
A first valve for controlling a flow rate of the steam added from the turbine to the feed water heater;
A second valve for controlling a flow rate of the cooled steam flowing into the feed water heater from the condenser; And
And a controller for controlling the opening of the first valve and the second valve. The method according to claim 1,
Wherein the controller reduces the opening of the first valve to increase the output of the turbine to reduce the flow rate of the steam added to the feedwater heater from the turbine. The method according to claim 1,
Wherein the controller increases the opening of the first valve to reduce the output of the turbine to increase the flow rate of the steam added from the turbine to the feedwater heater. The method according to claim 1,
Wherein the controller determines the flow rate of the steam added from the turbine to the feedwater heater by opening the first valve,
And adjusts the opening degree of the second valve based on a flow rate of steam added from the turbine to the feed water heater. 5. The method of claim 4,
Wherein the control unit decreases the opening degree of the second valve when the opening degree of the first valve is increased to increase the amount of the steam delivered from the condenser to the feed water heater, . 5. The method of claim 4,
Wherein the control unit increases the opening degree of the second valve when the opening degree of the first valve is decreased to decrease the amount of the steam delivered from the condenser to the feed water heater, . The method according to claim 1,
Wherein the second valve is disposed in a bypass pipe connecting a plurality of pipes connecting the condenser and the water heater to a steam pipe connecting the water heater and the boiler. The method according to claim 1,
Wherein the control unit controls the opening of the second valve so that the cooled steam is not supplied to the feedwater heater. The method according to claim 1,
And the second valve transfers a part of the cooled steam supplied from the condenser to a rotor connected to the water heater and the boiler at a controlled opening degree based on a control signal of the controller. The method according to claim 1,
The turbine includes a high-pressure turbine and a low-pressure turbine,
Wherein the feedwater heater includes a high-pressure feedwater heater and a low-pressure feedwater heater,
Wherein the first valve is disposed in each of a high-pressure sprinkling engine connecting the high-pressure turbine and the high-pressure feedwater heater, and a low-pressure sprue connecting the low-pressure turbine and the low-pressure feedwater heater. A method for controlling a steam flow rate of a steam flow rate control apparatus,
Adding a portion of the steam supplied from the boiler to the turbine and delivering the remaining portion of the steam to the condenser;
Controlling the opening of the first valve in the control unit to control the flow rate of the steam to be added;
The controller controls the opening degree of the second valve so that a part of the steam cooled in the condenser is transferred to a rotor connected to the feed water heater and the boiler and a part of the cooled steam remaining is reheated And controlling the flow rate of the steam. 12. The method of claim 11,
In the step of controlling the flow rate of the additional steam,
And decreasing the opening of the first valve to reduce the flow rate of the additional steam when the output of the turbine is reduced. 12. The method of claim 11,
In the step of controlling the flow rate of the additional steam,
And increasing the opening of the first valve to increase the flow rate of the additional steam when the output of the turbine is increased. 12. The method of claim 11,
In the reheating step using the additional steam,
Determining the flow rate of the steam to be added by opening of the first valve, and adjusting the opening of the second valve based on the flow rate of the steam to be added. 15. The method of claim 14,
In the reheating step using the additional steam,
And increasing the amount of steam cooled in the condenser by decreasing the opening degree of the second valve when the opening degree of the first valve is increased and the flow rate of the additional steam is increased. 15. The method of claim 14,
In the reheating step using the additional steam,
Wherein the amount of steam cooled in the condenser is reduced by increasing the opening degree of the second valve when the opening degree of the first valve is decreased and the flow rate of the additional steam is decreased. 12. The method of claim 11,
In the reheating step using the additional steam,
Controlling the opening of the second valve so that the cooled steam is not supplied to the feedwater heater, and delivering a part of the cooled steam to the rotor by the controlled opening degree.

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