JPH03175103A - Steam turbine equipment, method for supplying steam thereto, power plant and combined plant - Google Patents

Abstract

PURPOSE:To simplify steam turbine equipment so as to reduce the manufacturing cost of the equipment by supplying steam into both a packing portion and condensate after adjusting the temperature of the steam using a temperature adjusting means. CONSTITUTION:Steam from a steam source is directed to a desuperheater 22 through auxiliary steam piping 21. The flow of spray water is adjusted by a spray water flow adjusting valve 23 and the temperature of steam flowing out from the desuperheater 22 is adjusted to within the permissible temperature of packing portions 28, 29. After adjusting the temperature the steam has its pressure adjusted by a supplied steam adjusting valve 24 and a released steam adjusting valve 33 and is supplied to the packing portions 28, 29 via sealing piping 26, 27 and is also injected as deaerating steam from a steam injection nozzle 43 via steam releasing piping 103 into condensate contained in a condensate portion 5. The equipment of the grand sealing system is thus partially combined with that of the dearating system so that the equipment is simplified to reduce the manufacturing cost of the equipment.

Description

Detailed Description of the Invention [Industrial Field of Application] The present invention relates to a steam turbine equipment comprising a steam turbine and a condenser that condenses steam from the steam turbine;
The present invention relates to a steam supply method, a power generation plant, and a combined plant equipped with the steam turbine equipment.

[Prior Art] Generally, the gland seal of a steam turbine is performed by supplying steam to a packing part.

During normal operation, the steam supplied to the gasket is the same as the steam supplied to the steam turbine itself. At startup, etc., the steam supplied to the gasket is supplied to the outside air in order to isolate the turbine chamber from the outside air before driving the steam turbine. Steam from is used.

In addition, in a combined plant with a gas turbine, the condenser connected to the steam turbine has an independent degassing Mf! In such plants, the condensate is degassed by directly supplying steam to the condensate in the condenser to raise the temperature of the condensate.

An example of conventional steam turbine equipment that can supply steam to a gasket and degas condensate in a condenser is shown in FIG. 10.

This steam turbine equipment uses steam from a specific steam source to
Equipment for a gland seal system that supplies the packing portions 28 and 29 and equipment for a deaeration system that supplies the inside of the condenser 5 for deaerating condensate are independently provided.

The permissible temperature of the packing parts 28 and 29 is predetermined in order to suppress the amount of thermal expansion of the packing parts 28 and 29 to a constant S degree. For this reason.

It is necessary to adjust the temperature of the steam supplied to the packing parts 28 and 29 to within the above-mentioned allowable temperature.

A desuperheater 22 is provided in the equipment of the GL/N seal system in order to adjust the steam from the steam source to within the permissible temperature range. The spray water supplied to the attemperator 22 is regulated by a spray water flow rate control valve 23 that is driven based on the steam temperature on the downstream side of the attemperator 22 .

The steam whose temperature has been adjusted to within the permissible temperature range is adjusted to a predetermined pressure by the supply steam control valve 24, and then supplied to the packing portions 28, 29 from the seal pipes 26 and 27 via the header pipe 25.

When the steam turbine 3 enters the steady "M" rotation state, the steam supplied to the turbine itself performs gland sealing, and the steam used for this is sent to the gland condenser 31, 31
is discharged as drain.

When the load on the steam turbine 31' increases, the packing part 2
The amount of steam discharged from 8.29 will increase.

In order to process this steam, a steam exhaust pipe 32 is provided between a part of the header pipe 25 and the condenser 5.

The steam exhaust pipe 32 is provided with an exhaust steam control valve 60 in order to keep the steam pressure in the header pipe 25 constant.

As shown in FIG. 2, the set pressure b1. b0 is higher than the set pressure at which the supply steam control valve 24 closes. In FIG. 2, Ao indicates the valve opening characteristic of the supply steam control valve 24, and Bo indicates the valve opening characteristic of the exhaust steam control valve 60.

This is the supply steam control valve 2 when the steam turbine 3 is started.
4 is open and the exhaust steam control valve 60 is closed, the gland seal steam is not supplied from the steam exhaust pipe 32 into the condenser 5, but is unilaterally supplied to the packing parts 28 and 29. It's for a reason.

Therefore, in this steam turbine equipment, steam from the steam source cannot be supplied into the condenser 5.

The equipment of the degassing system includes a condenser 5 that collects steam from the steam source.
a degassed steam pipe 7o that leads to the condensate in the condenser 5, a desuperheater 71 for adjusting the steam to within the permissible temperature of the condenser 5, and a sprayer for adjusting the flow rate of spray water supplied to the desuperheater 71. It is configured to include a water flow rate control valve 72 and a deaeration steam flow rate control valve 73 that adjusts the flow rate of steam introduced into the condenser 5.

The allowable temperature of the condenser 5 is determined in order to suppress the difference in thermal expansion between the heat exchanger tube and the body plate in the condenser 5 within a certain range and to ensure the sealing performance of the cooling water. However, this temperature is not significantly different from the allowable temperature of the packing portion 28,29 in the shell, and is higher than the allowable temperature of the packing portion 28,29.

In addition, the equipment for the grand seal system includes:
There is one described in JP-A-54-130706.

This ground seal system equipment separates steam from a specific steam source before the condenser, passes one through the condensate in the condenser, and then combines the two again into the packing section. The flow rate of at least one of the steam that is supplied and flowed for one minute is adjusted based on the steam temperature on the downstream side. That is, by adjusting the flow rate of one of the divided steams, the amount of heat exchanged with the condensate in the condenser is adjusted, and steam at an appropriate temperature is supplied to the packing section.

The steam from the specific steam source partially exchanges heat with the condensate in the condenser, so that the temperature of the condensate is raised and the condensate is degassed. However, the steam flow rate required for gland seal steam is only 20 to 30% of the steam flow rate required for degassing steam, and furthermore, since the steam that performs degassing is only a part of the steam flow rate, the degassing effect is almost negligible. I can't wait.

Therefore, the equipment for this grand seal system also requires the equipment for the degassing system described above.

[Problems to be Solved by the Invention] In the steam turbine equipment, after dividing steam from a specific steam source, the steam is supplied to independently provided gland seal system equipment and deaeration system equipment. This achieves a grand seal for the steam turbine and deaeration of condensate. For this reason, things that adjust the temperature of steam,
There is a problem in that each piece of equipment must have its own equipment, such as a device to adjust the steam pressure, which increases production costs.

The present invention has been made by focusing on these conventional problems, and is capable of supplying steam at an appropriate temperature to the packing part, degassing condensate, and eliminating the need for glands. By integrating the sealing system equipment and the degassing system equipment, the aim is to simplify the equipment and reduce manufacturing costs.

[Means for Solving the Problem] In order to achieve the above object, the present application provides the following invention.

The invention relating to steam turbine equipment includes a steam turbine and a condenser that condenses steam from the steam turbine, and uses predetermined steam to seal the gland of the steam turbine and degas the condensate. In the steam turbine equipment, the steam temperature adjusting means adjusts the temperature of the predetermined steam to within an allowable temperature of a packing part of the steam turbine.

The present invention is characterized by comprising a gland seal steam supply pipe that guides the predetermined temperature-adjusted steam to a packing portion of the steam turbine, and a steam discharge pipe that discharges the predetermined steam into the condensate.

Another invention related to steam turbine equipment includes a steam turbine and a condenser that condenses steam from the steam turbine, and a predetermined steam is used to seal the grand seal of the steam turbine and the condensate. In steam turbine equipment that performs deaeration, a heat exchange device that exchanges heat between the predetermined steam and the condensate.

a gland seal steam supply pipe that guides the steam that has passed through the heat exchange device to a packing part of the steam turbine;
and steam discharge piping for discharging into the condensate.

The heat exchanger is characterized by comprising: steam flow rate adjusting means for adjusting the flow rate of the predetermined steam passing through the heat exchanger based on the temperature of the steam downstream from the heat exchanger.

Here, the heat exchange device may include the condenser and a pipe that is disposed in the condensate in the condenser and through which the predetermined steam passes.

Further, the heat exchange device includes a tank for storing the condensate;
It may be configured to include a pipe that is disposed in the condensate in the tank and through which the predetermined steam passes, and a condensate circulation means that circulates the condensate between the tank and the condenser. .

Yet another invention related to steam turbine equipment.

A steam turbine facility comprising a steam turbine and a condenser that condenses steam from the steam turbine, and performs grand sealing of the steam turbine and deaeration of the condensate using predetermined steam. a steam temperature adjusting means for adjusting the temperature of the steam within the permissible temperature of the packing part of the steam turbine; a supply steam regulating valve for adjusting the pressure of the predetermined steam whose temperature has been adjusted; A gland seal steam supply pipe that guides predetermined steam to a packing part of the steam turbine, a steam release pipe that releases the steam into the condensate water, and a discharge steam control valve that adjusts the amount of steam released into the condensate water.

When degassing the condensate at the time of starting up the steam turbine, the set pressure at which the discharge steam control valve opens is set to a value lower than the set pressure at which the supply steam control valve closes, and the condensate is degassed. The apparatus is characterized by comprising set pressure converting means for making the set pressure at which the discharge steam regulating valve opens higher than the set pressure at which the supply steam regulating valve closes when the discharge steam regulating valve is closed.

Note that a power generation plant may be configured by connecting a generator to the steam turbine of the steam turbine equipment.

Further, a combined plant may be configured such that exhaust gas from a gas turbine is supplied to a steam generator that supplies steam to a steam turbine of the steam turbine equipment.

Steam turbine equipment comprising a steam turbine and a condenser that condenses steam from the steam turbine, the steam turbine equipment supplying a predetermined amount of steam to a gasket part of the steam turbine and the condensate water. The invention relating to the steam supply method is characterized in that the temperature of the predetermined steam is adjusted to within an allowable temperature of the packing part of the steam turbine, and then the steam is supplied to the packing part of the steam turbine and the condensate. It is something to do.

[Operation] After the temperature of the predetermined steam is adjusted by the steam temperature adjusting means to within the permissible temperature of the packing part of the steam turbine, the predetermined steam is supplied into the packing part and the condensate.

The steam supplied to the packing part is regulated within the permissible temperature of the packing part, and this steam provides a gland seal without excessive thermal expansion of the packing part.

Further, the temperature of the condensate increases due to the steam supplied to the condensate, and the condensate is degassed.

Since both the degassed steam and the gland seal steam are temperature-controlled by the same steam regulating means, the equipment can be simplified.

In steam turbine equipment equipped with a heat exchange device, the heat exchange device exchanges heat between condensate and steam to adjust the temperature to within the permissible temperature of the packing section, and then supplies the steam to the packing section and the condensate to achieve the above-mentioned temperature. Similarly, gland sealing and condensate degassing are performed.

Furthermore, for the same reason as mentioned above, the equipment can be simplified.

The temperature of the steam is controlled by regulating the flow rate of steam passing through the heat exchanger using a steam flow rate control valve.

In the heat exchange device, since the condensate and steam exchange heat, the temperature of the condensate increases, further promoting the deaeration effect of the steam discharged into the condensate from the steam discharge piping.

In this way, temperature control using a heat exchanger is more effective than using a desuperheater that uses spray water.
Since the heat of steam can be used without waste for degassing condensate, the amount of steam used can be reduced, and the size of steam piping and control valves can be reduced, reducing running costs and manufacturing costs. Cost can be reduced.

[Example] Hereinafter, an example of the present invention will be described based on FIGS. 1 to 9. Note that the same parts in the prior art and the various embodiments are given the same reference numerals, and the explanation thereof will be omitted.

A first embodiment of the steam turbine equipment will be described based on FIGS. 1 and 2.

The steam turbine equipment of this embodiment includes a steam turbine 3, a condenser 5 that condenses steam from the steam turbine 3, and a condenser that supplies gland seal steam to packing parts 28 and 29 of the steam turbine 3. 5 and equipment for supplying deaerated steam.

The steam turbine 3 is connected to a main steam pipe 1 for introducing steam generated by a steam generator (not shown). The main steam pipe 1 is provided with a main steam stop valve 2 .

The steam turbine 3 includes a high-pressure packing section 28 that performs gland sealing on the steam inflow side of the turbine shaft, and a low-pressure packing section 29 that performs gland sealing on the steam exhaust side.

The high-pressure packing section 28 and the low-pressure packing section 29 are connected to a ground condenser 31 via a seal pipe 30.

An exhaust duct 4 that guides steam to a condenser 5 is provided on the steam exhaust port side of the steam turbine 3 .

The condenser 5 is connected to an air extractor 11 that extracts gas from the steam turbine exhaust in the process of condensing the steam turbine exhaust through heat exchange with cooling water.

Further, a condensate pipe 8 is connected to the condenser 5 for supplying condensate to the steam generator via a heat exchanger, a water supply pump, etc. (not shown). The condensate pipe 8 is provided with a condensate pump 7 that pumps out the condensate in the condenser 5. A condensate circulation pipe 9 is installed between the discharge side of the condensate pump 7 and the condenser 5 to circulate condensate between the condensate pump 7 and the condenser 5. . The condensate circulation pipe 9 is provided with a circulation flow rate control valve 10 that adjusts the circulation flow rate of condensate.

The equipment for supplying grand seal steam and deaerated steam includes an auxiliary steam pipe 21 extending from a steam source (not shown);
The steam passing through the auxiliary steam pipe 21 is transferred to the steam turbine 3.
A header piping 25 that is divided into the side and the condenser 5 side, a high pressure seal piping 26 that connects the header piping 25 and the high pressure packing section 28, a low pressure seal piping 27 that connects the header piping 25 and the low pressure packing section 29, and a header. a steam release sub-pipe 103 that guides the steam in the pipe 25 into the condensate in the condenser 5;
The apparatus includes an adjusting means for adjusting the flow rate, pressure, and temperature of the steam in the various pipings, and a detecting means for detecting the pressure and temperature of the steam in the various pipings.

The auxiliary steam pipe 21 is provided with an aerator 22 for regulating the temperature of the steam, and a supply steam control valve 24 for regulating the pressure of the steam supplied to the packing parts 28 and 29.

The spray water supplied to the desuperheater 22 is
．． The spray water flow rate yA control valve 23, which is driven based on the steam temperature on the downstream side of the attemperator 22, adjusts the steam supplied to the gaskets 28 and 26 to be within the permissible temperature of the gaskets 28 and 29. The steam temperature adjusting means includes a temperature reducing Ja 22 and a spray water flow rate vR regulating valve 23.

The supply steam control valve 24 includes a startup standby pressure setting device 101 that outputs the set value of the steam pressure in the header piping 25 during startup, etc., and a startup pressure setting device 101 that outputs the set value of the steam pressure in the header piping 25 during steady operation, etc. The pressure setting device 52 is connected to a computing unit 53 that outputs a valve opening control signal to the supply steam TAB valve 24 based on the set values from the pressure settings 552 and 101 and the detected value from the pressure detection l151. ing.

Regarding the startup waiting pressure setting 494101 and the pressure setting device 52, once the degassing of condensate at the time of startup is completed, the startup waiting pressure setting device 101 no longer outputs the set value.

A set value is output from the pressure setting device 52.

Note that the set pressure converting means is this startup waiting pressure setting device 10.
1 and a pressure setting device 52.

A discharge steam control valve 33 is provided in the steam discharge pipe 103 in order to keep the steam pressure in the header pipe 25 constant. The discharge steam control valve 33 has a pressure setting device 55 that outputs the set value of the steam pressure in the header piping 25, and a pressure setting device 55 that outputs the set value of the steam pressure in the header piping 25. A calculation W#56 that outputs a valve opening degree control signal to the control valve 33 is connected. A steam injection nozzle 43 for jetting steam into the condensate is provided at the end of the steam discharge pipe 103.

Next, the operation of the first embodiment of the steam turbine equipment will be explained.

First, the operation at the time of starting up the plant will be explained.

When starting up the plant, gland seal steam is not supplied from the steam turbine 3 itself to the high-pressure packing section 28 and the low-pressure packing section 29, so steam from a steam source (not shown) is supplied to the packing sections 28 and 29, and the steam is supplied to the packing sections 28 and 29. It is necessary to isolate the turbine 3 from the outside air.

Steam from the steam source passes through the auxiliary steam pipe 21,
It is guided to the desuperheater 22.

In the attemperator 22, the spray water flow rate control valve 23 adjusts the flow rate of the spray water, and the temperature of the steam flowing out from the attemperator 22 is adjusted to within the allowable temperature of the packing parts 28, 29.

The pressure of the steam whose temperature has been adjusted is adjusted by the supply steam control valve 24 which adjusts the aa based on the set value from the start-up standby pressure setting device 101.

The valve opening control of the supply steam regulating valve 24 and the discharge steam regulating valve 33 will be explained using FIG. 2.

In the figure, A1 represents the valve opening characteristic of the supply steam control valve 24, and B
o indicates the valve opening characteristic of the discharge steam control valve 33, and the steam pressure in the header pipe 25 is.

By the supply steam control valve 24 and the discharge steam control valve 33, b
It is controlled between 1 and a3.

The set pressure s,,b, at which the discharge steam regulating valve 33 opens is lower than the set pressure aim a, at which the supply steam regulating valve 24 closes, so that the header pressure is b□~a.

Between the supply steam control valve 24 and the discharge steam! ! 1 section valve 33
Both are open, and the steam that has passed through the supply steam control valve 24 is supplied as gland seal steam from the header piping 25 via the seal piping 26.27 to the packing part 28.29, and the steam discharge piping 103. The degassed steam is ejected from the steam injection nozzle 43 to the condensate in the condenser 5 via the discharge steam control valve 33.

The gland seal steam supplied to the packing parts 28 and 29 isolates the steam turbine 3 from the outside air.

Note that the temperature of this steam has already reached 28°29° at the packing part.
Since the temperature is adjusted within the allowable temperature range, the turbine shaft and the packing parts 28 and 29 will not undergo excessive thermal expansion. This steam used as a grand seal is led to the grand condenser 31 via the seal piping 30 and recovered as drain.

After the steam turbine 3 is isolated from the outside air, the air extractor 11
, and raise the vacuum chamber inside condenser 5.

As mentioned above, the temperature of the degassed steam supplied into the condenser 5 has already been adjusted to within the allowable temperature of the packing part 28, 29, so it is higher than the allowable temperature of the packing part 28, 29. In the condenser 5 having an allowable temperature, the sealing performance of the condenser 5 will not be impaired due to excessive thermal expansion.

The temperature of the condensate in the condenser 5 increases due to the degassed steam ejected into the condensate, and the partial pressure decreases due to the increase in the degree of vacuum.
Volume oxygen in the condensate is separated.

The oxygen separated from the condensate is exhausted by an air extractor 11.

At this time, the condensate is pumped by the condensate pump 7' to the condensate pipe 8,
Condensate circulation piping9. It is circulated between the condensers 5. This is to equalize the oxygen concentration in the condensate.

In this way, the degassed steam is temperature-controlled and pressure-controlled and is sufficiently supplied to the condensate in the condenser 5 6 Therefore,
The condensate in the condenser 5 can be reliably degassed.

The degassed condensate is supplied to the steam generator by the condensate pump 7 via a water supply pump (not shown) or the like.

When the sealing of the packing parts 28 and 29 and the degassing of condensate are completed, the main steam stop valve 2 opens, and steam for turbine driving starts to be supplied into the steam turbine 3.
After warming up, etc., the amount of supplied steam gradually increases, and the turbine starts to move and enters steady operation.

Next, the operation during steady operation of the plant will be explained.

Steam introduced into the steam turbine 3 from the main steam piping 1 via the main steam stop valve 2 operates the turbine, and then is led to the condenser 5 via the exhaust duct 4, where it collects cooling water and heat. It is exchanged and condensed to become condensate.

In the process of condensing steam, gas is separated from the condensate and discharged by the air extractor 11, so the oxygen concentration in the container is:
It is kept low.

This condensate is passed through a condensate pipe 8 by a condensate pump 7,
The water is supplied to the steam generator via a water supply pump (not shown) or the like.

Packing part 28.2 of steam turbine 3 during plant operation
The seal 9 is performed by steam supplied to the steam turbine 3 for turbine decommissioning.

For grand sealing, the steam supplied to the high pressure packing part 28 is transferred from the high pressure seal pipe 26 to the header pipe 25.
, is led to the low pressure packing part 29 via the low pressure seal piping 27. After this steam is used as a gland seal for the low-pressure packing section 29, it is led to the gland condenser 31 through the seal piping 30.

At this time, the supply steam control valve 24 is already connected to the start-up pressure setting device 10 when the degassing of condensate at the time of start-up is completed.
1 is transferred to control by the pressure setting device 52, and the valve opening characteristic is controlled as shown by Ao in FIG.

Therefore, when the steam supplied from the steam turbine 3 to the header pipe 25 via the high-pressure packing part 28 increases and the steam pressure in the header pipe 25 is 81 or higher, the supply steam control valve 24 is in the fully open state. It is.

The load on the steam turbine 3 further increases, and the header piping 2
When the steam pressure in 5 exceeds bl, the release steam control valve 33
begins to open, and the steam in the header pipe 25 is released into the condenser 5. Thereby, the pressure in the header piping 25 and the packing parts 28, 29 is controlled so as not to exceed a certain value.

As described above, in this embodiment, steam at an appropriate temperature can be supplied to the packing part at the time of starting up the plant, and condensate can be reliably degassed.

In addition, the steam discharge piping of the equipment of the grand seal system in the prior art is drawn into the condensate water of the condenser 5, and a steam injection nozzle 43 is provided there.

By providing the deaeration force setting device 101 to the supply steam control valve 24, the equipment of the gland seal system can also be used as equipment for deaeration, eliminating the need for any deaeration system equipment in the prior art. .

Equipment can be simplified and manufacturing costs can be reduced.

Next, a modification of the first embodiment will be explained based on FIGS. 3 and 4.

In the steam turbine equipment of this embodiment, instead of the startup pressure setting device 101 in the first embodiment, the discharge steam control valve 33 is controlled by the valve opening characteristic shown in FIG. 4B. The time pressure setting device 102 is provided in the discharge steam tA control valve 33, and the other parts are not changed at all.

According to this embodiment, when starting up the plant, the startup pressure setter 102 sets the set pressures aat al at which the discharge steam control valve 33 opens to be lower than the set pressure aat al at which the supply steam control valve 24 closes. Therefore, when the steam pressure in the header piping 25 is between b3 and ai, both the supply steam control valve 24 and the discharge steam control valve 33 are open, and the steam flows between the packing part 28, 29 and the condenser. Supplied within 5 days.

Therefore, the packing part 28 at the time of starting up the plant
．． The gland sealing and degassing of condensate in No. 29 can be performed reliably in the same manner as in the first embodiment.

Furthermore, in this embodiment, the steam pressure in the header piping 25 is controlled to be lower than that in the first embodiment, so that the allowable pressure of the equipment after the supply steam control valve 24 can be lowered. can further reduce manufacturing costs.

Next, regarding the second embodiment of the steam turbine equipment, the fifth
This will be explained using figures.

In the steam turbine equipment of this embodiment, the auxiliary steam piping 21 is immediately branched downstream of the supply steam control valve 24 of the first embodiment, and the gland seal steam is supplied to the packing portion 28, 29 of the steam turbine 3 on the one hand. One is equipped with equipment for supplying degassed steam to the condenser 5, and the other is equipped with equipment for supplying deaerated steam to the condenser 5.

The equipment that supplies the gland seal steam to the packing parts 28 and 29 includes a header pipe 25 that separates the steam branched from the auxiliary steam pipe 21 into the steam turbine 3 side and the condenser 5 side, and a header pipe 25 and the high-pressure packing part. 28 and high pressure seal piping 26.

A low-pressure seal pipe 27 connects the header pipe 25 and the low-pressure packing part 29, and the steam in the header pipe 25 is transferred to the condenser 5.
and a steam exhaust pipe 33 for discharging into the interior.

It is configured to include an exhaust steam control valve 60 that opens and closes based on the steam pressure in the header pipe 25.

The discharged steam control valve 60 contains the discharged steam in the first embodiment! Pressure setting device 55 provided in the 1lffi valve 33
and a computing unit 56 are connected.

The equipment that supplies deaerated steam to the condenser 5 is the auxiliary steam piping 2.
It is configured to include a steam discharge pipe 106 that discharges steam branched from 1 into condensate water in the condenser 5, and a discharge steam control valve 104.

A steam jet nozzle 43 is provided at the end of the steam discharge pipe 106 to jet steam into the condensate.

The discharge steam control valve 104 is equipped with a transmitter 10 that opens and closes the discharge steam control valve 104 during deaeration of condensate during startup.
5 is connected.

In addition, the equipment around temperature reduction 1ji22 in this example,
The equipment around the steam turbine 3 and the equipment around the condensate a5 are the same as in the first embodiment.

According to this embodiment, when starting up the plant, the packing part 2
8.29 and the condensate in the condenser 5 can be supplied with steam that has been adjusted to within the permissible temperature of the packing part 28.29 by the desuperheater 22. Similarly, the gland sealing of the packing parts 28 and 29 and the degassing of condensate can be reliably performed.

Furthermore, since the temperature of the steam from the specific steam source is lowered by the single attemperator 22 and then supplied as gland seal steam and deaerated steam, the equipment can be simplified. Manufacturing costs can be reduced.

Next, a third embodiment of the steam turbine equipment will be described based on FIG. 6.

The steam turbine equipment of this embodiment includes a steam turbine 3 that is the same as that of the first embodiment, a condenser 5 that is also the same as that of the first embodiment, and gland seals 28 and 26 of the steam turbine 3. and equipment for supplying deaerated steam to the condenser 5.

The equipment that supplies gland seal steam and deaeration steam is 1.
Auxiliary steam piping 21 extending from a steam source (not shown), heat exchanger tubes 112 for passing the steam that has passed through the auxiliary steam piping 21 into condensate water in the condenser 5 for heat exchange, and heat exchanger tubes 112. The passed steam is transferred to the steam turbine 3 side and the condenser 5
a relay pipe 113 for guiding the steam to the side, a header pipe 25 that divides the steam that has passed through the relay pipe 113 into the steam turbine 3 side and the condenser 5 side, and the header pipe 25 and packing parts 28 and 29. Seal piping 26°27 connecting the
A steam discharge pipe 32 for discharging steam from the header pipe 25 into the condenser 5, and a steam discharge pipe 115 for discharging steam from the middle of the relay pipe 113 into the condensate of the condenser 5.
, an adjusting means for adjusting the flow rate, pressure, and temperature of the steam in the various pipings, and a detecting means for detecting the pressure and temperature of the steam in the various pipings.

The heat exchanger tube 112 and the hot well chamber of the condenser 5 constitute a heat exchange device.

The steam release pipe 115 includes a steam flow rate control valve 1 that adjusts the steam flow rate passing through the auxiliary steam pipe 21 and the heat transfer tube 112 by adjusting the steam flow rate of the steam release pipe 115.
14 are provided.

The steam flow rate control valve 114 includes a temperature setter 122 that outputs the set value of the steam temperature after the heat transfer tube 112, and a steam flow rate adjustment valve based on the detected value by the temperature detector 121 and the set value from the temperature setter 122. A computing unit 123 that outputs a valve opening control signal is connected to the valve 114 . Note that the set value of the steam temperature is set to a value within the allowable temperature of the packing portions 28 and 29.

A pressure detector 124 is connected to the computing unit 123 to detect the steam pressure within the relay pipe 113. This pressure detector 124 is provided to prevent steam from getting wet by determining the degree of superheating of the steam from the steam pressure and steam temperature and correcting the output of the valve opening degree control signal.

A steam injection nozzle 43 for jetting steam into the condensate is provided at the end of the steam discharge pipe 115.

A supply steam control valve 24 that operates based on the pressure detected by the pressure detector 51 is provided downstream of the branch point of the steam release pipe 115 in the relay pipe 113.

A pressure setting device 52 and a calculator 53 are connected to the supply steam control valve 24 so that the valve opening characteristic of the supply steam control valve 24 is controlled as shown by Ao in FIG.

The steam exhaust pipe 32 is provided with an exhaust steam control valve 6o that opens and closes based on the pressure detected by a pressure detector 54 provided in the header pipe 25.

A pressure setting device 55 and a computing unit 56 are connected to the exhaust steam regulating valve 60 so that the valve opening characteristic of the exhaust steam regulating valve 6° is controlled as shown by Bo in FIG.

Next, the operation of the third embodiment will be explained.

When the plant is started up, the auxiliary steam piping 21 sends the steam necessary for gland sealing of the gaskets 28 and 29 and for degassing condensate.

This steam passes through the heat transfer tube 112, undergoes heat exchange with the condensate in the condenser 5, and is adjusted to within the permissible temperature of the packing parts 28 and 29.

The temperature adjustment at this time is performed as follows.

When the detected value by the temperature detector 121 is lower than the set value, the discharge steam control valve 114 operates to open.

This is because when the opening degree of the discharged steam control valve 114 becomes large, the flow rate of steam passing through the heat transfer tubes 112 increases.

Even if the amount of heat emitted from the heat exchanger tubes 112 does not change, the amount of temperature drop of the steam decreases, and the detected value of steam moisture increases and approaches the set value.

Further, when the detected value by the temperature detector 121 is higher than the set value, the discharge steam control valve 114 is activated.

Operates in the closing direction.

This is because when the opening degree of the discharged steam control valve 114 becomes smaller, the flow rate of steam passing through the heat exchanger tubes 112 decreases.

As the amount of steam temperature decrease increases, the detected steam temperature value decreases and approaches the set value.

Therefore, even if the temperature of the steam sent from the auxiliary steam pipe 21 changes, the temperature of the steam passing through the heat transfer tube 112 remains within the set value, which is the allowable temperature of the packing parts 28 and 29.

In this way, the temperature-controlled steam is transferred to the supply steam control valve 2.
After the pressure is adjusted by 4, header piping 25 and 0
It is supplied to the packing part 28.29 via the seal line 26.27. The amount of steam used as gland seal steam at this time is:

is almost constant.

The steam that has passed through the discharged steam control valve 114 is ejected from the steam injection nozzle 43 into the condensate as degassed steam, increases the temperature of the condensate, and degasses the condensate.

The steam passing through the heat transfer tubes 112 exchanges heat with the condensate to raise the temperature of the condensate, thereby further promoting deaeration of the condensate.

In this example, the temperature of the steam is adjusted by heat exchange with condensate rather than by spraying water, so the heat of the steam can be used without wasting it, and the amount of steam used can be reduced. At the same time, the size of the steam piping can be reduced, and running costs and manufacturing costs can be reduced.

Furthermore, in this embodiment, the temperature of the degassed steam and the gland seal steam is controlled by the same equipment.

The van can be simplified and manufacturing costs can be further reduced.

Next, a modification of the third embodiment will be explained based on FIG. 7.

In this embodiment, a heat exchange device 116 is provided outside the condenser 5 instead of the heat exchanger tube 112 in the condenser 5 in the third embodiment, and a connection between the heat exchange device 116 and the condenser 5 is provided. The condensate is circulated so that the condensate and steam exchange heat outside the condenser 5. Note that this embodiment is completely the same as the third embodiment regarding the parts other than Wl1m regarding this heat exchange.

The heat exchange device 116 includes a tank for temporarily storing condensate, and
Heat exchanger tube 1 that passes steam sent from auxiliary steam piping 21
12a.

Condensate circulation piping 1t7°118 for circulating condensate is installed between the condensate piping 8 and the heat exchange device 116 and between the heat exchange device 116 and the condenser 5.

The condensate circulation pipe 117 is provided with a circulation flow rate control valve 119 that adjusts the circulation flow rate of condensate.

A connecting pipe 120 is installed between the heat exchange device 1116 and the condenser 5 for guiding oxygen separated from the condensate in the heat exchange device fl16 to the air oil extractor 11 via the condenser 5. has been done. Note that this communication pipe 120 may be directly connected to the air extraction all without going through the condenser 5.

Compared to the third embodiment, this embodiment has the following points: when applying this embodiment to existing steam turbine equipment, the troublesome manufacturing process of providing the heat transfer tube 112 in the condensate Ja5 is eliminated, and the steam Exactly the same effects can be obtained as in the third embodiment, except that the heat exchange method between the third embodiment and the condensate is different.

Note that the first example, a modification of the first example, and a second example
Instead of the attemperator in the embodiment, a heat exchange device may be used as in the third embodiment and the present embodiment to constitute the steam temperature adjusting means.

Next, a combined plant in which the steam turbine equipment of the various embodiments described above is combined with gas turbine equipment will be described.

As shown in FIG. 8, the combined plant sends exhaust gas used for decommissioning gas turbines 153 and 154 to a steam generator 152, generates steam using the heat of the exhaust gas, and transfers this steam to a steam turbine 152. It is sent to

This combined plant is called a multi-shaft type, and the gas turbine 153, 154 and the steam turbine 3 are each provided with a shaft, and a generator 1 is attached to one end of the shaft.
55 and 151 are connected to each other.

Further, the steam turbine equipment of the various embodiments described above may constitute a single-shaft combined plant, as shown in FIG.

In general, in combined plants, the amount of steam supplied to the steam turbine is smaller than in plants that directly generate steam using fuel such as heavy oil or coal in the steam generator, so the amount of steam supplied to the steam turbine is smaller than that of steam generators that use fuel such as heavy oil or coal. Since there are almost no cases where an air vent is provided independently, it is preferable to apply the various embodiments described above to such equipment. Therefore, when the various embodiments described above regarding the steam power generation equipment are adopted in a combined plant, it is possible to obtain the effect of reducing manufacturing costs by integrating the deaeration system equipment and the gland seal system equipment as described above.

[Effects of the Invention] According to the present invention, the temperature of the steam is adjusted by the temperature adjusting means before the steam is supplied to the packing part and the condensate, so steam at an appropriate temperature is supplied to the packing part. In addition, condensate can be degassed by partially integrating the gland seal system equipment and deaeration system equipment.

Equipment can be simplified and manufacturing costs can be reduced.

[Brief explanation of drawings]

FIG. 1 and FIG. 2 show a first embodiment.
The figure is a system diagram of the steam turbine equipment, Figure 2 is a valve opening characteristic diagram of the supply steam control valve and discharge steam control valve, and Figures 3 and 4.
The figures show a modification of the first embodiment, Fig. 3 is a system diagram of the steam turbine equipment, Fig. 4 is a valve opening characteristic diagram of the supply steam control valve and discharge steam control valve, and Fig. 5 is a diagram of the valve opening degree characteristics of the supply steam control valve and discharge steam control valve. A system diagram of the steam turbine equipment of the second embodiment, FIG. 6 is a system diagram of the steam turbine Ha of the third embodiment, FIG. 7 is a system diagram of the steam turbine equipment of a modification of the third embodiment, FIG. 8 is a system diagram of a multi-shaft combined plant, FIG. 9 is a system diagram of a single-shaft combined plant, and FIG. 10 is a system diagram of conventional steam turbine equipment. 3... Steam turbine, 5... Condenser, 22... Attemperator, 24... Supply steam control valve, 26... High pressure seal piping. 27...Low pressure seal piping, 28...High pressure packing section, 29...Low pressure packing section, 32...Steam discharge piping, 33...Discharge steam control valve, 52.55...Pressure setting device . 60... Exhaust steam control valve, 101, 102... Starting pressure setting device, 103, 115... Steam discharge piping. 112.112a... Heat exchanger tube, 116... Heat exchange device, 151.155, 156... Generator, 152...
・Steam generator, 153,154...gas turbine.

Claims (1)

[Claims] 1. A steam turbine and a condenser that condenses steam from the steam turbine, and a predetermined steam that seals the gland of the steam turbine and degasses the condensate. In the steam turbine equipment, the steam temperature adjusting means adjusts the temperature of the predetermined steam to within an allowable temperature of the packing part of the steam turbine; 1. A steam turbine facility comprising: a gland seal steam supply pipe leading to the condensate; and a steam discharge pipe for discharging the condensate into the condensate. 2. A steam turbine facility comprising a steam turbine and a condenser that condenses steam from the steam turbine, and performs grand sealing of the steam turbine and deaeration of the condensate using predetermined steam, a heat exchange device for exchanging heat between the predetermined steam and the condensate; a gland seal steam supply pipe that guides the predetermined steam that has passed through the heat exchange device to a packing section of the steam turbine; and a steam flow rate adjusting means for adjusting the flow rate of the predetermined steam passing through the heat exchange device based on the temperature of the steam downstream from the heat exchange device. Characteristic steam turbine equipment. 3. The heat exchange device is characterized in that it is configured to include the condenser and a pipe that is disposed in the condensate in the condenser and through which the predetermined steam passes. Steam turbine equipment according to 2. 4. The heat exchange device includes a tank for storing the condensate, a pipe arranged in the condensate in the tank and through which the predetermined steam passes, and a pipe for transferring the condensate between the tank and the condenser. 3. The steam turbine equipment according to claim 2, further comprising a condensate circulation means for circulating condensate between the condensate and the condensate. 5. Steam turbine equipment comprising a steam turbine and a condenser that condenses steam from the steam turbine, and performs grand sealing of the steam turbine and deaeration of the condensate using a predetermined steam; a steam temperature regulating means for regulating the temperature of a predetermined steam to within an allowable temperature of the packing portion of the steam turbine; a supply steam regulating valve for regulating the pressure of the predetermined steam whose temperature has been regulated; A gland seal steam supply pipe that guides the predetermined steam to a packing part of the steam turbine, a steam release pipe that releases the predetermined steam into the condensate water, and a discharge steam control valve that adjusts the amount of steam released into the condensate water. , when degassing the condensate at the time of starting the steam turbine, the set pressure at which the discharge steam control valve opens is set to a value lower than the set pressure at which the supply steam control valve closes, and the deaeration of the condensate steam turbine equipment, comprising set pressure converting means for making the set pressure at which the discharge steam control valve opens higher than the set pressure at which the supply steam control valve closes when the discharge steam control valve is closed. 6. Steam turbine equipment comprising a steam turbine and a condenser that condenses steam from the steam turbine, the steam turbine supplying a predetermined amount of steam to the packing part of the steam turbine and the condensate water. The steam supply method for equipment is characterized in that the temperature of the predetermined steam is adjusted to within an allowable temperature of the packing section of the steam turbine, and then the steam is supplied to the packing section of the steam turbine and the condensate. Steam supply method for steam turbine equipment. 7. A power generation plant comprising the steam turbine equipment according to claim 1, 2, 3, 4, or 5, and comprising a generator that generates power by driving the steam turbine. 8. The steam turbine equipment according to claim 1, 2, 3, 4, or 5, comprising: a steam generator that supplies steam to the steam turbine; and a gas turbine that supplies exhaust gas as a heat source for the steam generator. A combined plant characterized by having.