KR102013584B1 - Apparatus and method for controlling steam flow - Google Patents

Abstract

The present invention relates to an apparatus and a method for controlling a steam flow rate of a turbine, which increases the output of the turbine by adjusting the flow rate of steam added from the turbine, and protects the condenser by adjusting the flow rate of the cooled steam supplied from the condenser to the heater. A vapor flow rate control apparatus and method.
An apparatus for controlling a steam flow rate according to an embodiment of the present invention includes a boiler for generating steam, a turbine supplied with steam, and additionally extracting a part of steam, a first valve for controlling a flow rate of steam extracted from the turbine, and a turbine. A condenser for cooling the introduced steam, a heater for reheating the cooled steam introduced from the condenser using steam extracted from the turbine, a second valve for controlling the flow rate of the cooled steam introduced from the condenser to the heater, and It includes a control unit for controlling the opening degree of the first valve and the second valve.

Description

Apparatus and method for controlling steam flow

The present invention relates to a steam flow control device and method, and more particularly, to regulate the output of the turbine by adjusting the flow rate of the steam to be added from the turbine, and the water supply heating by adjusting the flow rate of the cooled steam supplied to the feed water heater in the condenser A steam flow control device and method for protecting a machine are disclosed.

In general, a turbine is a machine that converts the energy of a fluid such as water, gas, steam, etc. into mechanical work, usually by planting several feathers or vanes on the circumference of a rotating body and exhaling steam or gas thereon to generate high It is a turbo type machine that rotates.

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

In this process, a valve is installed to extract steam from the turbine to the heater, which has a problem in that it is not possible to adjust the amount of steam to be added to the heater by performing only the opening and closing.

The present invention is to solve the above-described problems, by adjusting the flow rate of the steam is added to the feed water heater in the turbine to adjust the output of the turbine, and by adjusting the flow rate of the cooled steam supplied to the feed water heater in the condenser It is an object of the present invention to provide a vapor flow control device and method for protecting the same.

In addition to the technical task of the present invention mentioned above, other features and advantages of the present invention will be described below, or from such description and description will be clearly understood by those skilled in the art.

A steam flow control apparatus for a turbine according to an embodiment of the present invention for achieving the above object is a boiler for generating steam, a turbine supplied with steam, and a condenser for cooling the steam flowing from the turbine and a portion of the steam is added A water supply heater for reheating the cooled steam introduced from the condenser by using steam extracted from the turbine, a first valve for controlling the flow rate of steam added from the turbine to the water supply heater, and cooling introduced into the water supply heater from the condenser A second valve for controlling the flow rate of the vaporized steam, and a control unit for controlling the opening degree of the first valve and the second valve.

Here, the control unit reduces the opening degree of the first valve to increase the output of the turbine, thereby reducing the flow rate of the steam bleeding from the turbine to the feed water heater.

In addition, the control unit increases the opening degree of the first valve in order to reduce the output of the turbine, thereby increasing the flow rate of steam which is extracted from the turbine to the feed water heater.

In addition, the control unit determines the flow rate of steam to be extracted 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 steam to be added to the feed water heater from the turbine.

In addition, when the opening degree of the first valve is increased and the flow rate of the additional steam is increased, the opening degree of the second valve is decreased to increase the amount of steam transferred from the condenser to the feed water heater.

In addition, the controller increases the opening degree of the second valve by decreasing the amount of steam transferred from the condenser to the water heater when the opening degree of the first valve is reduced and the flow rate of the additional steam decreases.

In addition, the second valve is disposed in a plurality of pipes connecting the condenser and the water supply heater, and a bypass pipe connecting the conduit connecting the water supply heater and the boiler.

In addition, the control unit controls the opening degree of the second valve so that a predetermined or more cooled steam is not supplied to the feed water heater.

In addition, the second valve transfers a part of the cooled steam supplied from the condenser to the engine that connects the water heater and the boiler based on the controlled opening degree based on the control signal of the controller.

In addition, the turbine includes a high pressure turbine and a low pressure turbine, the water heater includes a high pressure water heater and a low pressure water heater, and the first valve is a high pressure pump and a low pressure turbine and a low pressure water supply heating connecting the high pressure turbine and the high pressure water heater. It is arranged in each of the low pressure duct connecting the group.

Steam flow control method of the steam flow control apparatus of the turbine according to an embodiment of the present invention for achieving the above object is to extract a portion of the steam supplied from the boiler, and to transfer a portion of the remaining steam to the condenser, and the controller Controlling the flow rate of the additional steam by controlling the opening degree of the first valve in the control unit; and controlling the opening degree of the second valve in the control unit to transfer a part of the steam cooled by the condenser to the engine connecting the water heater and the boiler And reheating the portion of the remaining cooled steam using the additional steam.

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

In addition, in the step of controlling the flow rate of the additional steam, when the output of the turbine is increased, the flow rate of the additional steam is increased by increasing the opening degree of the first valve.

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

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

In addition, in the reheating step using the additional steam, when the opening degree of the first valve is reduced and the flow rate of the additional steam is reduced, 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 that a predetermined or more cooled steam is not supplied to the water supply heater, and a part of the steam cooled to the controlled opening is delivered to the engine. .

The apparatus and method for controlling the steam flow rate of a turbine according to an embodiment of the present invention may control the output of the turbine by adjusting the flow rate of steam added to the feed water heater in the turbine.

In addition, the flow rate of the cooled steam supplied from the condenser to the feed water heater may be adjusted to prevent the feed water heater from being damaged by the cooled steam.

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

1 is a view showing the configuration of a steam flow control device according to an embodiment of the present invention.
2 is a view showing a steam flow rate control method of the 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 an embodiment of the present invention.
4 is a view showing a modification of the method for controlling the steam flow rate of the second valve according to an embodiment of the present invention.
5 is a view illustrating a steam flow rate control device 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 so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention.

In order to clearly describe the present invention, parts irrelevant to the description are omitted, and like reference numerals designate like elements throughout the specification.

Throughout the specification, when a part is "connected" to another part, this includes not only "directly connected" but also "electrically connected" with another element in between. . In addition, when a part is said to "include" a certain component, which means that it may further include other components, except to exclude other components unless otherwise stated.

When a portion is referred to as being "above" another portion, it may be just above the other portion or may be accompanied by another portion in between. In contrast, when a part is mentioned as "directly above" another part, no other part is involved between them.

Terms such as first, second, and third are used to describe various parts, components, regions, layers, and / or sections, but are not limited to these. These terms are only used to distinguish one part, component, region, layer or section from another part, component, region, layer or section. Accordingly, the first portion, component, region, layer or section described below may be referred to as the second portion, component, region, layer or section without departing from the scope of the invention.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the singular forms “a,” “an,” and “the” include plural forms as well, unless the phrases clearly indicate the opposite. As used herein, the meaning of "comprising" embodies a particular characteristic, region, integer, step, operation, element and / or component, and the presence of other characteristics, region, integer, step, operation, element and / or component It does not exclude the addition.

Terms indicating relative space such as "below" and "above" may be used to more easily explain the relationship of one part to another part shown in the drawings. These terms are intended to include other meanings or operations of the device in use with the meanings intended in the figures. For example, if the device in the figure is reversed, any parts described as being "below" of the other parts are described as being "above" the other parts. Thus, the exemplary term "below" encompasses both up and down directions. The device can be rotated 90 degrees or at other angles, the terms representing relative space being interpreted accordingly.

Unless defined otherwise, all terms including technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. Commonly defined terms used are additionally interpreted to have a meaning consistent with the related technical literature and the presently disclosed contents, and are not interpreted in an ideal or very formal sense unless defined.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention.

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

Referring to FIG. 1, the steam flow control apparatus 100 according to an embodiment of the present invention may include a boiler 110, a turbine 120, a condenser 130, a water supply heater 140, a first valve 150, and a first valve 150. It may include two valve 160 and the control unit 170.

Boiler 110 may generate steam. Steam generated in the boiler 110 may be introduced into the turbine 120. Here, a valve may be disposed between the boiler 110 and the turbine 120 to supply steam to 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 may be used as an energy source for causing the turbine 120 to generate rotational energy, and the rotational energy may be converted into electrical energy by rotating a generator. Steam discharged from the turbine 120 is introduced into the condenser 130, a portion of the steam may be additionally introduced into the feed water heater 140. The extraction pipe 230 may be connected between the turbine 120 and the feed water heater 140 to allow the steam to be introduced into the feed water heater 140. The purge tube 230 may be provided with a first valve 150 for controlling the amount of additional steam supplied to the feed water heater 140.

The condenser 130 may cool steam introduced from the turbine 120. The condenser 130 may reduce the steam rotated by 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 feed water heater 140 to allow the cooled steam to flow into the feed water heater 140. Steam cooled in the condenser 130 through the conduit 220 may be supplied to the water supply heater 140, the conduit 220 is the second valve 160 for controlling the opening and closing degree of the conduit 220 It may include adjusting the amount of cooled steam supplied to the feed water heater 140.

The water supply heater 140 may reheat the cooled steam introduced from the condenser 130 by using steam extracted from the turbine 120. That is, steam additionally extracted from the turbine 120 may be introduced into the feedwater heater 140, and steam cooled from the condenser 130 may be introduced. At this time, the water supply heater 140 may reheat the steam introduced from the water supply heater 140 using the additional steam introduced from the turbine 120 as a heat source. The reheated steam may enter the boiler 110 again. In addition, the water supply heater 140 may transfer the heated steam back to the condenser 130 to cool. In this case, the water supply heater 140 may supply the steam heated to the condenser 130 through a separate pipe from the conduit tube 220 in which the steam cooled in the condenser 130 is transferred to the water supply heater 140.

The first valve 150 may control the flow rate of the steam to be added to the feed water heater 140 in the turbine 120. The first valve 150 may be a control valve that can adjust the opening degree. The first valve 150 may adjust an opening degree of the valve based on the control of the controller 170. Here, when the opening degree of the first valve 150 is reduced, the flow rate of steam added to the water supply heater 140 may be reduced, and accordingly, the amount of steam introduced into the turbine 120 is increased, so that the output of the turbine 120 is increased. Can increase. In addition, when the opening degree of the first valve 150 is increased, the flow rate of steam added to the water supply heater 140 may be increased, thereby reducing the amount of steam flowing into the turbine 120, thereby outputting the turbine 120. May decrease.

The second valve 160 is a bypass pipe connecting the plurality of pipes 220 connecting the condenser 130 and the water supply heater 140 and the ash pipe 240 connecting the water supply heater 140 and the boiler 110. May be disposed at 250. The second valve 160 may control a flow rate of the cooled steam flowing into the water heater 140 from the condenser 130. The second valve 160 may be a control valve that can adjust the opening degree. The second valve 160 may adjust the opening degree of the valve based on the control of the controller 170. Here, when the opening degree of the second valve 160 is reduced, the flow rate of the cooled steam flowing into the water supply heater 140 may be increased, and when the opening degree of the second valve 160 is increased, it is introduced into the water supply heater 140. The flow rate of the cooled steam being reduced can be reduced.

The controller 170 may adjust the opening degrees of the first valve 150 and the second valve 160. When the controller 170 determines that the output of the turbine 120 is reduced, the controller 170 may control the opening degree of the first valve 150 that adjusts the flow rate of steam added from the turbine 120 to the feed water heater 140 to be lowered. have. Accordingly, the amount of steam of the turbine 120 may increase, so that the output of the turbine 120 may increase. In addition, when it is determined that the output of the turbine 120 is increased, the control unit 170 controls the opening degree of the first valve 150 for adjusting the flow rate of steam added from the turbine 120 to the feed water heater 140. can do. Accordingly, the amount of steam of the turbine 120 may be reduced, and thus the output of the turbine 120 may be reduced.

In addition, the controller 170 may control the opening degree of the second valve 160 to increase when it is determined that a predetermined amount or more of steam enters the water heater 140 from the condenser 130. That is, the controller 170 may adjust the opening degree of the second valve 160 so that only the amount of steam to be reheated by the water heater 140 flows into the water heater 140. Accordingly, the amount of steam exceeded in a predetermined amount can be delivered to the engine 240 along the bypass pipe 250, the water supply heater 140 so that a predetermined or more steam is not supplied to the water supply heater 140. Can protect. Here, the steam passing through the second valve 160 and the steam discharged by being reheated by the feed water heater 140 may be introduced into the boiler 110 again.

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 supply heater 140 is 60, the second valve 160 may reduce the amount of cooled steam discharged from the condenser 130. 40 out of 100 can be passed to the institution 240. Accordingly, the water supply heater 140 may be protected so that the amount of steam introduced into the water supply heater 140 does not exceed a predetermined amount or more that can be reheated by the water supply heater 140.

In addition, the controller 170 determines the flow rate of steam transmitted from the turbine 120 to the water heater 140 by the opening degree of the first valve 150, and flows into the water heater 140 from the turbine 120. The opening degree of the second valve 160 may 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 control unit 170 and the flow rate of steam added to the water supply heater 140 increases, the control unit 170 adjusts the opening degree of the second valve 160. Decrease to increase the amount of steam delivered from the condenser 130 to the feedwater heater 140. As the steam added to the feedwater heater 140 increases, the feedwater heater 140 may heat a larger amount of steam using the extracted steam. Therefore, the controller 170 may reduce the opening degree of the second valve 160 to increase the amount of steam introduced into the water heater 140 so that the water heater 140 may heat more steam. In addition, when the opening degree of the first valve 150 is reduced by the control of the controller 170 and the flow rate of steam added to the feed water heater 140 decreases, the controller 170 increases the opening degree of the second valve 160. The amount of steam delivered from the condenser 130 to the water heater 140 may be reduced. As the steam added to the feedwater heater 140 decreases, the feedwater heater 140 may heat only a small amount of steam using the extracted steam. Accordingly, the control unit 170 increases the opening degree of the second valve 160 to reduce the amount of steam introduced into the water supply heater 140 so that the amount greater than the amount of steam that the water supply heater 140 can heat. It is possible to prevent the ingress of steam. Therefore, the water supply heater 140 may be protected by not exceeding a predetermined amount or more that can be reheated in the water supply heater 140.

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

1 and 2, the turbine 120 extracts a part of the steam supplied from the boiler 110 (S11). The turbine 120 may supply a portion of the steam to the feed water heater 140. In this case, between the turbine 120 and the feed water heater 140 may be connected to the extraction pipe 230 for transmitting the additional steam to the feed water heater 140. In the extraction pipe 230, a first valve 150 may be disposed to adjust an amount of steam to be extracted.

Next, it is determined whether the output of the turbine 120 is reduced (S12).

When the output of the turbine 120 is reduced, the control unit 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 amount of steam to be added by lowering the opening degree of the first valve 130. Accordingly, the amount of steam in the turbine 120 may increase, so that the output of the turbine 120 may increase.

On the other hand, if the output of the turbine 120 is not reduced, the control unit 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 amount of steam to be added by increasing the opening degree of the first valve 130. Accordingly, the amount of steam is reduced in the turbine 120, the output of the turbine 120 can be reduced.

The water supply heater 140 heats the steam introduced from the condenser 130 using the steam extracted by the water supply heater 140 (S15). A steam whose amount is adjusted according to the opening degree may be introduced into the water supply heater 140, and steam cooled by the condenser 130 may be introduced. The water supply heater 140 may heat the cooled steam introduced from the condenser 130 using the extracted steam as a heat source.

Steam heated in the water supply heater 140 is introduced into the boiler (S16). The boiler 110 may supply steam introduced from the water supply heater 140 to the turbine 120 to be used as energy for generating rotational energy in the turbine 120. Thus, the above process can be repeated.

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

1 and 3, the turbine 120 supplies a part of the steam supplied from the boiler 110 to the condenser 130 (S21). The turbine 120 may extract a part of steam supplied from the boiler 110 and transfer a part of the remaining steam to the condenser 130.

The condenser 130 cools the supplied steam (S22).

Next, it is determined whether the steam cooled in the condenser 130 is a predetermined amount or more (S23). Here, the predetermined amount may be an amount of steam to be heated in the water supply heater 140, which may be a capacity for receiving steam cooled in the water supply heater 140, a capacity for heating steam in the water supply heater 140, and the like. Can be determined.

When the steam cooled in the condenser 140 is greater than or equal to a predetermined amount, the opening degree of the second valve 160 is controlled to transfer the amount of steam exceeded by the predetermined amount to the engine 240 (S24). If the steam cooled in the condenser 140 is a predetermined amount or more, the controller 170 may control the opening degree of the second valve 160. Here, the controller 170 may control the opening of the second valve 160 to be more opened when the amount of cooled steam exceeds a predetermined amount, and the second valve 160 when the amount of cooled steam slightly exceeds a predetermined amount. Can be controlled to open a little. The cooled steam may be delivered to the steam engine 240 by the opening of the second valve 160, and may flow into the boiler 110 along the steam engine 240.

The water supply heater 140 heats the steam introduced from the condenser 130 (S25). The water supply heater 140 may heat the steam introduced by a predetermined amount by the opening of the second valve 160. In addition, when the steam cooled in the condenser 130 is not a predetermined amount or more, all of the cooled steam may be introduced into the water supply heater 140, and the water supply heater 140 may heat the introduced steam.

Steam heated in the feed water heater 140 is introduced into the boiler (S26). The boiler 110 may supply steam introduced from the water supply heater 140 to the turbine 120 to be used as energy for generating rotational energy in the turbine 120. Thus, the above process can be repeated.

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

1 and 4, it is determined whether the flow rate of steam added from the turbine 120 to the feed water heater 240 is increased (S31). Here, the flow rate of the steam to be added to the water supply heater 240 may vary according to the opening degree of the first valve 150, the control unit 270 to adjust the opening degree of the first valve 150 to output the turbine 120 Can be adjusted.

When the flow rate of the steam added from the turbine 120 to the feed water heater 240 is increased, the control unit 270 reduces the opening degree of the second valve 160 (S32). When the flow rate of 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 the extracted steam can be used to heat a larger amount of steam. . Accordingly, the control unit 270 reduces the opening degree of the second valve 160 to reduce the flow rate of the steam flowing directly into the boiler 110, so that a larger amount of steam is introduced into the feed water heater 240. Can be heated.

On the other hand, if the flow rate of the steam added to the feed water heater 240 in the turbine 120 is not increased, the control unit 270 increases the opening degree of the second valve 160 (S33). When the flow rate of steam added to the feedwater heater 240 is reduced, 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 extracted steam. do. Accordingly, the controller 270 increases the flow rate of steam bypassed by increasing the opening degree of the second valve 160 and directly flowing into the boiler 110, so that the flow rate of steam that the water heater 240 can heat is increased. Excessive water may be prevented from flowing into the water heater 240.

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

Steam heated in the feed water heater 140 is introduced into the boiler (S35). The boiler 110 may supply steam introduced from the water supply heater 140 to the turbine 120 to be used as energy for generating rotational energy in the turbine 120. Thus, the above process can be repeated.

The present invention provides a turbine steam flow control apparatus and method for increasing the output of the turbine by adjusting the flow rate of the steam to be added from the turbine, and protects the feed water heater by adjusting the flow rate of the cooled steam supplied to the feed water heater in the condenser. Can be.

5 is a view illustrating a steam flow rate control device 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 be introduced into the high pressure turbine 122 through the steam pipe 210.

The high pressure turbine 122 may 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 transfer a portion of the steam to the high pressure water heater 142. Here, the steam of the high pressure turbine 122 may be delivered to the high pressure water supply heater 142 through the high pressure extractor 232, and the high pressure extractor 230 may supply the flow rate of the steam delivered to the high pressure water supply heater 142. An adjusting high pressure first valve 152 may be disposed.

The low pressure turbine 124 may generate rotational energy using steam introduced from the high pressure turbine 122. The low pressure turbine 124 may be operated by a relatively low pressure / low temperature steam than the high pressure turbine (122). The generated rotational energy may be converted into electrical 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 feed water heater 144. Here, the steam of the low pressure turbine 124 may be delivered to the low pressure water supply heater 144 through the low pressure extraction pipe 234, the flow rate of the steam delivered to the low pressure water supply heater 144 to the low pressure extraction pipe 234. An adjustable low pressure first valve 154 may be disposed.

The condenser 130 may reduce the steam rotated in the low pressure turbine 124 to water through heat exchange. The steam cooled in the condenser 130 may be supplied to the water supply heater 140 through the conduit 220. 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 water supply heater 140 may include a low pressure water heater 144 and a high pressure water heater 142. Between the low pressure water supply heater 144 and the low pressure turbine 124, a low pressure extraction pipe 234 for supplying low pressure steam to the low pressure water supply heater 144 may be connected. The cooled steam may be heated by using the additional steam delivered through the low pressure duct 234 as a heat source. Steam heated through the low pressure feed water heater 144 may be stored in the feed 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 heater 142. A high pressure extractor 232 may be connected between the high pressure turbine 122 and the high pressure feed water heater 142 to supply the high pressure steam to the high pressure feed water heater 142. The steam supplied to the high pressure water supply heater 142 may be heated by using the high pressure additional steam delivered through the high pressure extractor 232 as a heat source. The steam heated by the high pressure feed water heater 142 may be supplied to the boiler 110.

Unlike the above-described example, the turbine 120 is described as being composed of a high pressure turbine 122 and a low pressure turbine 124, but is not limited thereto. A medium pressure turbine may be further included between the high pressure turbine 122 and the low pressure turbine 124.

Those skilled in the art to which the present invention pertains may understand that the present invention may be embodied in other specific forms without changing the technical spirit or essential features, and thus, the embodiments described above are exemplary in all respects and are not intended to be limiting. Should be. The scope of the present invention is shown by the following claims rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included in the scope of the present invention. .

100: steam flow control device 110: boiler
120: turbine 130: condenser
140: water supply heater 150: first valve
160: second valve 170: control unit
180: water supply tank 190: embankment pump
210: steam pipe 220: plural pipe
230: extractor 240: institution
250: bypass tube 122: high-pressure turbine
124: low pressure turbine 232: high pressure extraction pipe
234: low pressure pump 142: high pressure water heater
144: low pressure water supply heater 152: high pressure first valve
154: low pressure first valve

Claims (17)

Boilers for generating steam;
A turbine which receives the steam and extracts a part of the steam;
A condenser for cooling the steam introduced from the turbine;
A water supply heater for reheating the cooled steam introduced from the condenser using the steam extracted from the turbine;
A first valve controlling a flow rate of the steam which is added to the feed water heater in the turbine;
A second valve controlling a flow rate of the cooled steam flowing into the water heater from the condenser; And
And a control unit for controlling the opening degrees of the first valve and the second valve.
The control unit determines the flow rate of the steam to be added to the feed water heater in the turbine by the opening degree of the first valve,
The controller may increase the amount of steam transferred from the condenser to the water heater 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.
The control unit increases the opening degree of the second valve when the opening degree of the first valve is reduced to reduce the amount of the steam transferred from the condenser to the water supply heater when the flow rate of the additional steam is reduced,
The control unit controls the opening degree of the second valve so that the excess steam in the predetermined amount is not transmitted to the water supply heater when the steam cooled in the condenser is a predetermined amount or more,
And said constant amount is the amount of steam to be reheated in said feed water heater. The method of claim 1,
The control unit reduces the flow rate of the steam to be added to the feed water heater in the turbine by reducing the opening degree of the first valve to increase the output of the turbine. The method of claim 1,
And the control unit increases the flow rate of the steam which is added to the feed water heater in the turbine by increasing the opening degree of the first valve to reduce the output of the turbine. delete delete delete The method of claim 1,
And the second valve is disposed in a plurality of pipes connecting the condenser and the water supply heater, and a bypass pipe connecting the exhaust pipe connecting the water supply heater and the boiler. The method of claim 1,
The control unit is a steam flow rate control device for controlling the opening degree of the second valve so that the cooled steam is not supplied to a predetermined level. The method of claim 1,
The second valve is a steam flow control device for delivering a portion of the cooled steam supplied from the condenser in a controlled opening based on a control signal of the control unit to the engine that connects the water heater and the boiler. The method of claim 1,
The turbine comprises a high pressure turbine and a low pressure turbine,
The water heater includes a high pressure water heater and a low pressure water heater,
And the first valve is disposed in a high pressure extraction pipe connecting the high pressure turbine and the high pressure water supply heater, and a low pressure extraction pipe connecting the low pressure turbine and the low pressure water supply heater, respectively. In the steam flow control method of the steam flow control device,
Extracting a portion of the steam supplied from the boiler to the turbine and transferring the remaining portion of the steam to a condenser;
Controlling the flow rate of the additional steam by controlling the opening degree of the first valve in the control unit;
The control unit controls the opening degree of the second valve to transfer a part of the steam cooled by the condenser to an engine that connects the water heater and the boiler, and re-heats the part of the remaining cooled steam by using the additional steam. Comprising;
Reheating using the additional steam,
The flow rate of the additional steam is determined by the opening degree of the first valve,
When the opening degree of the first valve is increased and the flow rate of the additional steam is increased, the opening degree of the second valve is decreased to increase the amount of steam cooled in the condenser,
When the opening degree of the first valve is reduced and the flow rate of the additional steam is decreased, the opening degree of the second valve is increased to reduce the amount of steam cooled in the condenser,
The control unit controls the opening degree of the second valve so that the excess steam in the predetermined amount is delivered to the water supply heater when the steam cooled by the condenser is a predetermined amount or more,
The greater the amount of excess steam increases the opening degree of the second valve. The method of claim 11,
In the step of controlling the flow rate of the additional steam,
And when the output of the turbine is reduced, reducing the opening degree of the first valve to reduce the flow rate of the additional steam. The method of claim 11,
In the step of controlling the flow rate of the additional steam,
And when the output of the turbine is increased, increasing the opening degree of the first valve to increase the flow rate of the additional steam. delete delete delete The method of claim 11,
Reheating using the additional steam,
And controlling the opening degree of the second valve such that at least a predetermined amount of the cooled steam is not supplied to the water supply heater, and transferring a part of the cooled steam to the engine at a controlled opening degree.

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