JP2013160093A - Protection device for turbine exhaust chamber and condenser, and monitoring and control device for turbine exhaust chamber and condenser - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a turbine exhaust chamber and a condenser from being damaged while reducing a time and cost required for recovery.SOLUTION: A protection device for a turbine exhaust chamber and a condenser includes: a condenser 107; a turbine exhaust chamber casing 106 integrally covering a steam turbine and the condenser; atmospheric air discharge plates 100a, 100b which are broken when pressure in the turbine exhaust chamber casing reaches a first predetermined value; temperature measuring means 102a, 102b for measuring temperatures in the turbine exhaust chamber casing; a setter 205 for setting a second predetermined value; a comparator 206 which outputs an external output when pressure corresponding to the measured temperature becomes equal to or more than a second predetermined value for the pressure or when the measured temperature becomes equal to or higher than a second predetermined value for temperatures based on the measured temperature and the second preset value; and a vacuum destruction valve 103 which discharges steam in the turbine exhaust chamber casing when the external output is performed.

Description

  The present invention relates to a protection device for a turbine exhaust chamber and a condenser, and a monitoring control device for the turbine exhaust chamber and a condenser.

  A power plant having a steam turbine is provided with a condenser for cooling and condensing the exhaust steam of the turbine. During plant operation, the condenser is kept at a negative pressure.

  Seawater for cooling the exhaust steam of the turbine is supplied by a circulating water pump. However, the cooling water supply by the circulating water pump may stop for some reason. Alternatively, as a situation where the flow rate of the cooling water is insufficient, for example, an all-in-house (blackout) accident in which all power in the power plant is lost may occur. In this case, the condenser cooling and condensing functions are lost.

  When such an accident occurs, the boiler and the steam turbine are stopped urgently. However, the boiler immediately after stopping has residual heat. In order to release this residual heat, steam and hot drain water flow into the condenser via a turbine bypass valve, various drain valves and the like.

  However, the steam does not condense due to the loss of the condenser cooling and condensation functions. For this reason, the pressure in the condenser and the turbine exhaust chamber integrated with the condenser as a pressure vessel gradually rises due to the vapor pressure, and finally changes from negative pressure to positive pressure, that is, atmospheric pressure or higher. This positive pressure state is not preferable for a condenser or a turbine exhaust chamber that is originally designed on the assumption that the negative pressure is used.

  Therefore, an atmospheric discharge plate is used as a protection device for the condenser and the turbine exhaust chamber.

  The air release plate is installed on the ceiling of the turbine exhaust chamber and forms part of the turbine exhaust chamber. When the pressure in the turbine exhaust chamber becomes positive, specifically, when the gauge pressure becomes positive from about 20 kPa to 40 kPa, the atmospheric discharge plate is broken. In this way, it is designed to open the steam in the condenser to the atmosphere.

  That is, the atmospheric discharge plate is provided to prevent breakage of the important turbine exhaust chamber and condenser by being broken by itself.

  The following description exists in the third page, the fifth column, lines 36 to 41 of the following Patent Document 1 that discloses a conventional protection device.

  “Many current steam turbines are structured to withstand negative pressure. Therefore, as in this prior art, when outside air is pushed into a steam turbine for cooling and the inside of the steam turbine is made positive pressure, Unexpected damage will occur, such as the release plate being destroyed. "

Japanese Patent Publication No. 3-4723

  When the atmospheric release plate breaks, it takes several days to restore it. For this reason, the power plant is forced to stop, which has a great impact on society, for example, when power demand is tight.

  For IPP operators (Independent Power Producers) who operate power plants under a power sale contract with a commercial power company, this is directly connected to a large economic loss.

  In view of the above circumstances, the present invention provides a protection device for a turbine exhaust chamber and a condenser, a turbine exhaust chamber and a condenser that can prevent damage to the turbine exhaust chamber and the condenser without requiring much time and cost for restoration. It is an object of the present invention to provide a monitoring control device for a water vessel.

A turbine exhaust chamber and condenser protection device according to an embodiment of the present invention includes:
A condenser that cools and condenses the steam exhausted from the steam turbine;
A turbine exhaust chamber casing that integrally covers the steam turbine and the condenser;
An atmospheric discharge plate that breaks when the pressure inside the turbine exhaust chamber casing reaches a first predetermined value;
Temperature measuring means for measuring the temperature inside the turbine exhaust chamber casing;
A first setter for setting a second predetermined value;
Based on the temperature measured by the temperature measuring means and the second predetermined value set in the first setter, the pressure corresponding to the temperature is greater than or equal to the second predetermined value relating to pressure. Or when the temperature is equal to or higher than the second predetermined value related to temperature, an output means for making an external output;
When the output is made from the output means, discharge means for releasing the steam inside the turbine exhaust chamber casing to the outside,
It is characterized by providing.

A turbine exhaust chamber and condenser monitoring and control device according to an embodiment of the present invention includes:
A first setter for setting a first predetermined value;
A condenser that cools and condenses steam exhausted from the steam turbine, a measured temperature inside a turbine exhaust chamber casing that integrally covers the steam turbine, and the first setter set in the first setter An output that outputs an external output when the pressure corresponding to the temperature becomes equal to or higher than the first predetermined value related to pressure, or when the temperature becomes equal to or higher than the first predetermined value related to temperature, based on the predetermined value of 1 Means,
It is characterized by providing.

  According to the turbine exhaust chamber and condenser protection device and the turbine exhaust chamber and condenser monitoring and control device of the present invention, the turbine exhaust chamber and condenser can be damaged without requiring much time and cost for restoration. It is possible to prevent.

It is a longitudinal cross-sectional view which shows the structure of the protection apparatus of the turbine exhaust chamber and the condenser by the 1st Embodiment of this invention. It is a graph which shows the relationship between saturated steam pressure and saturated steam temperature. It is a circuit diagram which shows the structure of the monitoring control apparatus with which the protection apparatus of the turbine exhaust chamber and a condenser is provided. It is a longitudinal cross-sectional view which shows the structure of the monitoring control apparatus with which the protection apparatus of the turbine exhaust chamber and condenser by the 2nd Embodiment of this invention is provided.

  As described above, when the pressure in the turbine exhaust chamber becomes positive, the atmospheric discharge plate breaks, and the steam in the condenser is released to the atmosphere, thereby preventing damage to the important turbine exhaust chamber and condenser. be able to. Such an air release plate is useful when it breaks itself. Therefore, it is necessary to provide the atmospheric discharge plate as a final protection means. However, if it is possible to detect that the turbine exhaust chamber has become positive pressure before the atmospheric release plate breaks and release the steam in the turbine exhaust chamber to the atmosphere, the above-described useless recovery Construction can be avoided.

  What is important here is to measure a very small positive pressure near atmospheric pressure with high accuracy.

  In general, pressure measurement is performed using a pressure transmitter, a pressure switch, or the like. However, when trying to accurately measure the minimum positive pressure using these, there is a problem that "the pressure transmitter and the pressure switch measure the saturation pressure of the atmospheric temperature, not the internal pressure of the turbine exhaust chamber" . Hereinafter, such a phenomenon will be described.

  In general, in the measurement of pressure using a pressure transmitter, the actual process at the measurement point, i.e., steam, water, oil, etc., to be measured is guided to the pressure transmitter through a capillary tube, also called instrumentation piping, Pressure is measured.

  Consider the case of measuring the pressure in the vicinity of the atmospheric release plate using such a pressure transmitter.

  In the vicinity of the atmospheric discharge plate in the turbine exhaust chamber, for example, a basket chip that takes in steam as an actual process is installed. Steam in the turbine exhaust chamber enters the basket chip, is led out of the turbine exhaust chamber through the capillary tube, and is sent to a pressure transmitter to measure the pressure.

  At this time, the vapor pressure is affected by the environmental temperature surrounding the capillary tube outside the turbine exhaust chamber, that is, the atmospheric temperature. More specifically, the pressure in the capillary tube becomes a saturation pressure of the atmospheric temperature or a pressure near the saturation pressure under the influence thereof.

  As a result, the pressure transmitter measures not the pressure in the turbine exhaust chamber but the saturation pressure of the atmospheric temperature outside the turbine exhaust chamber or a pressure in the vicinity thereof. Such inconvenience is also the same in the pressure switch that uses the capillary tube to derive and measure the steam outside the turbine exhaust chamber.

  This phenomenon can be ignored if the actual process is much hotter and higher pressure than the atmosphere. However, it cannot be ignored in the measurement of an actual process having a pressure or temperature near atmospheric pressure, and the measurement accuracy is lowered.

  In order to alleviate such a situation, measures such as applying a heat insulating material around the capillary tube can be considered. However, with such measures, it is very difficult to fundamentally improve the accuracy of pressure measurement.

  Therefore, in the embodiment of the present invention, the inventors have noticed that the steam in the turbine exhaust chamber is saturated steam, and have found that the temperature in the turbine exhaust chamber is measured instead of the pressure measurement. The measured temperature is converted into steam saturation pressure. It is detected that the pressure in the obtained turbine exhaust chamber has become a predetermined positive pressure. This is characterized in that any of the discharge means is operated to release the steam in the turbine exhaust chamber into the atmosphere before the atmospheric discharge plate is broken.

  Hereinafter, a protection device for a turbine exhaust chamber and a condenser according to an embodiment of the present invention will be described with reference to the drawings.

(1) 1st Embodiment In FIG. 1, the structure of the protection apparatus of the turbine exhaust chamber and condenser by the 1st Embodiment of this invention is shown. FIG. 1 shows a cross-sectional configuration of a low-pressure turbine rotor 104, an inner casing 105, a turbine exhaust chamber casing 106, and a condenser 107 in a power plant. The turbine exhaust chamber casing 106 is formed so as to integrally cover the turbine and the condenser 107 as a container.

  During the operation of the power plant, the internal pressures of the turbine exhaust chambers 101a and 101b and the condenser 107 (hereinafter referred to as the internal pressure) are maintained at a negative pressure close to a vacuum. Steam a flows into the crossover pipe 108 from the exhaust of the intermediate pressure turbine (not shown). This steam a is guided to the inner casing 105 and drives the low-pressure turbine rotor 104 as driving steam b.

  The driving steam b decreases the pressure for each stage of the low-pressure turbine rotor 104. Finally, exhaust steam c and d is discharged to the turbine exhaust chambers 101a and 101b and the condenser 107, respectively. Exhaust steams c and d are condensed by cooling water sent from the circulating water pump (not shown) into the condenser 107 and accumulated in the lower hot well 109.

  If the circulating water pump is stopped due to some accident from this operating state and the supply of cooling water is stopped or the flow rate is insufficient, the exhaust steam c and d are not condensed. As a result, when the internal pressure increases and the value rises to the protection trip value, the power plant including the steam turbine and the boiler is urgently stopped, and the inflow of the exhaust steam c and d is stopped.

  However, the boiler immediately after stopping has residual heat. This heat flows into the condenser 107 as bypass steam e sent from the turbine bypass valve 110 or heat drain water f sent from the drain valve 111. Thereby, the internal pressure rises gradually.

  As described above, the steam in the turbine exhaust chambers 101a and 101b is saturated steam. For this reason, as shown in FIG. 2, a relationship is established between the saturated steam pressure and the saturated steam temperature in which the pressure increases as the temperature increases.

  The atmospheric release plates 100a and 100b are broken when the internal pressure increases from negative pressure to positive pressure, for example, when 129.51 kPa · abs (abs is absolute pressure) is reached. Thereby, the saturated steam in the turbine exhaust chamber casing 106 is released to the atmosphere. In the following description, for convenience, it is assumed that the pressure when the atmospheric discharge plates 100a and 100b are broken is 129.51 kPa · abs.

  The configuration provided in the first embodiment in order to release saturated steam at the stage before reaching the breaking pressure of the atmospheric discharge plates 100a and 100b will be described in detail.

  A resistance temperature detector 102a measures the internal temperature g near the atmospheric discharge plate 100a in the turbine exhaust chamber casing 106, and the resistance temperature detector 102b determines the internal temperature h near the atmospheric discharge plate 100b. Measure each. The measured temperatures g and h are input to the monitoring control device 201 through the cables 112a and 112b, respectively.

  FIG. 3 shows a configuration of the arithmetic unit circuit 202 provided in the monitoring control apparatus 201. The arithmetic unit circuit 202 includes a high value selector 203, a converter 204, a setter 205, a comparator 206, a setter 207, and a comparator 208. The converter 204 and the comparator 206 constitute output means for generating the output n.

  The internal temperatures g and h measured by the resistance temperature detectors 102 a and 102 b are input to the high value selector 203. The higher one of the in-vessel temperatures g and h is output as the steam temperature j and input to the converter 204.

  Inside the converter 204, a characteristic curve showing the relationship between the saturated steam pressure and the saturated steam temperature shown in FIG. 2 is set. Thus, when the steam temperature j is input to the converter 204, a saturation pressure k corresponding to the steam temperature j is obtained and output based on this characteristic curve. More specifically, in the characteristic curve shown in FIG. 2, the Y-axis steam temperature j is converted to the X-axis saturated steam pressure k and output.

  The output saturated steam pressure k is input to the comparators 206 and 208, respectively.

  The setter 205 is set with a predetermined set value m. The saturated steam pressure k and the set value m are input to the comparator 206, and both are compared. While the saturated steam pressure k is equal to or lower than the set value m, the output n of the comparator 106 remains off. When the saturated steam pressure k becomes larger than the set value m, the output n is turned on. The operation of the comparator 208 will be described later.

  Here, as the set value m, for example, the vacuum breaking valve opening pressure 105.09 kPa · abs shown in FIG. 2 is set. This set value m is set to a value smaller than the pressure 129.51 kPa · abs when the atmospheric discharge plates 100a and 100b break.

  When the external output n from the comparator 206 is generated, the external output n from the monitoring controller 201 shown in FIG. 1 is made. This output is transmitted to the drive motor 114 through the cable 113. By driving the drive motor 114, the vacuum breaker valve 103 is opened. Thereby, the saturated steam in the turbine exhaust chamber casing 106 is released to the atmosphere through the pipe 115.

  Here, when an external output n is made from the comparator 206, the vacuum breaker valve 103 is used as a discharge means for releasing the steam in the turbine exhaust chamber casing 106 to the outside. However, the vacuum break valve is not limited as long as it can operate as a means for discharging the steam in the turbine exhaust chamber casing 106 to the outside in response to the output of the comparator.

  By the way, the vacuum breaker valve 103 is an electric valve that is always provided in the condenser 107. The vacuum breaker valve 103 is for performing a so-called vacuum break that opens the condenser 107 to the atmospheric state when the plant is stopped for a long time.

  As described above, the vacuum breaker valve 103 is installed on the pipe 115 that communicates the inside and the outside of the condenser 107. While maintaining the negative pressure state in the condenser 107, the vacuum breaker valve 103 is closed. When performing a vacuum break, the vacuum break valve 103 is opened and the atmosphere flows into the condenser 107.

  In the first embodiment, on the contrary, when the internal pressures of the turbine exhaust chamber casing 106 and the condenser 107 reach predetermined positive pressures, the vacuum breaker valve 103 is opened. Thereby, internal vapor | steam is discharge | released in air | atmosphere.

  As described above, saturated steam holds the internal pressure of the turbine exhaust chamber casing 106. Therefore, by measuring the internal temperature, the internal pressure can be obtained using the characteristic curve of FIG.

  As described above, for example, a thermocouple can be used to measure the internal temperature in addition to the resistance temperature detector. When temperature measurement is performed using a resistance temperature detector or a thermocouple, there is no need for a capillary tube that is necessary for measuring the internal pressure. Therefore, it is possible to measure the internal temperature with high accuracy and calculate the internal pressure without being affected by the atmospheric temperature. In the first embodiment, a resistance temperature detector, which is generally considered to have higher measurement accuracy than a thermocouple, is used.

  As shown in the characteristic curve of FIG. 2, the saturation temperature corresponding to the pressure 105.09 kPa · abs preset as the set value m in the setting device 205 is 101 ° C. On the other hand, the saturation temperature corresponding to the pressure 129.51 kPa · abs at which the atmospheric discharge plates 100a and 100b break is 107 ° C. By using the resistance temperature detectors 102a and 102b, the temperature difference of 6 ° C. can be reliably separated.

  Therefore, the vacuum breaker valve 103 is opened when the internal temperature 101 ° C., which is sufficiently lower than the internal temperature 107 ° C. corresponding to the internal pressure at which the atmospheric discharge plates 100a and 100b break, is detected. Thereby, the turbine exhaust chamber casing 106 and the condenser 107 can be protected.

  Here, the vacuum breaker valve 103 is used as means for releasing the internal steam of the turbine exhaust chamber casing 106 and the condenser 107. As described above, the vacuum breaker valve 103 is a facility that is always provided in the condenser 107. Therefore, it is not necessary to provide an additional means for releasing steam. For this reason, an increase in cost can be prevented.

  Further, the vacuum breaker valve is usually provided as an electric valve driven by a direct current (DC) power source in preparation for stopping turbine rotation as an emergency means.

  In other words, the alternating current (AC) power source is lost in all in-house accidents. However, a direct current (DC) power supply is always ensured even in an emergency. For this reason, by using the vacuum breaker valve 103 that can be driven by a direct current (DC) power supply, a reliable protective device can be obtained.

  Note that there are points to consider when the vacuum breaker valve 103 is used as a vapor discharge means. That is, when the atmospheric discharge plates 100a and 100b are ruptured, the internal vapor is released at once because the large area is ruptured. On the other hand, in the vapor discharge by the vacuum breaker valve 103, due to the size limitation of the pipe 115, it cannot be opened at a stretch and is discharged over time.

  Needless to say, the opening of the vacuum breaker valve 103 must be performed at a positive pressure smaller than the positive pressure at which the atmospheric discharge plates 100a and 100b break. However, it is necessary to consider that it takes time to reduce the internal pressure in the vapor discharge by the vacuum breaker valve 103.

  Therefore, it is appropriate that the opening timing of the vacuum breaker valve 103 is set to a very small positive pressure immediately after the saturation pressure changes from a negative pressure to a positive pressure. For this reason, in the first embodiment, the set value m is set to 105.09 kPa · abs. Such a setting is possible by measurement with high accuracy using the resistance temperature detectors 102a and 102b.

  According to the first embodiment, the vacuum break valve 103 is opened immediately after the saturation pressure changes from negative pressure to positive pressure, so that the residual heat flowing into the turbine exhaust chamber casing 106 thereafter is Run away. This prevents the internal pressure from increasing when the valve is opened.

  In the first embodiment, it is conceivable that the atmospheric discharge plates 100a and 100b are not provided by providing the configuration in which the vacuum breaker valve 103 is opened after the saturation pressure changes from negative pressure to positive pressure. . In this case, the manufacturing cost of the atmospheric release plate and the cost required for recovery can be reduced.

  However, depending on the various types of accidents in the power plant, the internal pressure does not necessarily increase gradually, and the possibility of a rapid increase cannot be denied.

  As described above, in consideration of all types of accidents, it is considered desirable to install the atmospheric release plates 100a and 100b in order to further improve safety.

  By the way, it has been stated that it is appropriate to set the set value m to a very small positive pressure immediately after the saturation pressure changes from negative pressure to positive pressure and to open the vacuum breaker valve 103. However, it is also conceivable that a further time margin can be provided by setting the set value m to a negative pressure value lower than the positive pressure and opening the vacuum breaker valve 103 at the negative pressure stage.

  However, when the vacuum breaker valve 103 is opened with a negative pressure, the internal pressure rises toward the atmospheric pressure at that moment.

  Consider the phenomena that can occur at this time. Sealing steam is supplied to the ground portions 116 a and 116 b through which the low-pressure turbine rotor 104 passes through the turbine exhaust chamber casing 106 in order to seal the gaps existing in the through portions.

  However, once the in-house accident has occurred, the ground steam exhauster stops and the function of collecting the seal steam is lost. While the internal pressure is negative, the seal steam is sucked into the condenser 107. For this reason, leakage does not occur in the gap between the through portions, or even if it occurs, it is reduced.

  However, when the internal pressure becomes atmospheric pressure, the seal steam leaks from the gap between the through portions, and steam and moisture are mixed into the bearing oil. Alternatively, the bearing oil may be carried by the leaked seal steam and come into contact with a hot object, resulting in a fire.

  Thus, it is also important to prevent breakage of the air release plates 100a and 100b. However, it is also important to maintain this negative pressure state while the internal pressure is negative.

  Therefore, considering the two points of preventing breakage of the air release plates 100a and 100b and maintaining the negative pressure state in the chamber, the first embodiment is configured as follows.

  Assuming an accident situation in which the boiler has a relatively small amount of residual heat and the amount of heat sufficient to boost the internal pressure to a positive pressure or higher does not flow in, the vacuum breaker valve 103 remains closed and maintains negative pressure as much as possible. Keep it.

  From this state, at a small positive pressure immediately after the internal pressure changes to a positive pressure, the vacuum breaker valve 103 is opened to release steam. As the positive pressure at this time, as described above, a value of 105.09 kPa · abs slightly larger than the atmospheric pressure (101.42 kPa · abs) is set as the set value m.

  By the way, the fact that the internal pressure changes from negative pressure to positive pressure has a great influence on the operation of the power plant. Therefore, it is also important as a protective device to notify the operator of this change.

  Therefore, as shown in FIG. 3, the monitoring control apparatus 201 includes a setting device 207 and a comparator 208.

  A set value p is set in the setting device 207 in advance. The comparator 208 is given the saturation pressure k output from the converter 204 and the set value p output from the setter 207. The comparator 208 compares the two, and when the saturation pressure k becomes larger than the set value p, an alarm q is output. In the first embodiment, the set value p is set to 99 kPa · abs immediately before the internal pressure changes from negative pressure to positive pressure.

  As described above, according to the first embodiment, when the internal pressure changes from a negative pressure to a positive pressure and reaches 105.09 kPa, the vacuum release valve 103 is opened to release air into the atmosphere. It is possible to prevent the plates 100a and 100b from being broken and prevent the turbine exhaust chamber and the condenser from being damaged without requiring much time and cost for restoration.

(2) Second Embodiment A turbine exhaust chamber and condenser protection device according to a second embodiment of the present invention will be described with reference to the drawings.

  The second embodiment is different from the monitoring control apparatus 201 in the first embodiment in the configuration of the monitoring control apparatus 401. As shown in FIG. 4, the arithmetic unit circuit 402 provided in the monitoring control device 401 includes a high value selector 403, a setter 405, and a comparator 406. The comparator 406 constitutes output means for generating the external output n.

  The internal temperature g and the internal temperature h are supplied to the high value selector 403, and the higher value is selected and output as the steam temperature j, and directly input to the comparator 406 without going through the converter. .

  In the setting device 405, 101 ° C. is set in advance as the set value r. The set steam temperature 101 ° C. corresponds to the steam pressure 105.09 kPa when the vacuum breaker valve 103 is opened in FIG.

  The set value r is input to the comparator 406, and the steam temperature j and the set value r are compared. When the steam temperature j becomes larger than the set value r, the output n is turned on. Thereafter, as in the first embodiment, the vacuum breaker valve 103 is opened when an external output n is generated.

  Thus, in the second embodiment, the set value r is given as the temperature set value. The steam temperature j output from the high value selector 403 is input to the comparator 406 without being converted into steam pressure by the converter. By not requiring a converter, the circuit configuration of the arithmetic unit circuit 402 is simplified and the cost is reduced.

  However, considering the case of revising and modifying the steam pressure when the vacuum break valve opens, the steam pressure is set directly in the setting device 205 and set in the comparator 206 as in the first embodiment. It is more convenient to compare the value m with the steam pressure k.

  As described above, according to the second embodiment, when the internal pressure changes from negative pressure to positive pressure and reaches a temperature of 101 ° C. corresponding to 105.09 kPa, the vacuum breaker valve 103 is turned on. By opening the valve, it is possible to prevent the atmospheric discharge plates 100a and 100b from being destroyed and prevent the turbine exhaust chamber and the condenser from being damaged without requiring much time and cost for restoration. In addition, the configuration of the arithmetic unit circuit 402 is simplified and contributes to cost reduction.

  Although some embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the technical scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the technical scope and gist of the invention, and are also included in the invention described in the claims and the equivalents thereof.

  For example, in the first and second embodiments, the saturation pressure when the vacuum breaker valve 103 is opened is 109.09 kPa. However, this value is an example and is not limited to this value.

  In the first embodiment, a set value of 99 kPa · abs is set as the pressure for outputting an alarm. However, the value is not limited to this value, and the set value p can be set to a desired value.

  In the second embodiment, an alarm is output in the same manner as in the first embodiment. Therefore, an alarm may be output when the steam temperature j reaches a predetermined pressure value.

100a, 100b Atmospheric discharge plates 101a, 101b Turbine exhaust chambers 102a, 102b RTDs
103 Vacuum break valve 104 Low pressure turbine rotor 105 Inner casing 106 Turbine exhaust chamber casing 107 Condenser 108 Crossover pipe 109 Hot well 110 Turbine bypass valve 111 Drain valves 112a, 112b, 113, 418 Cable 114 Drive motor 115 Piping 201 Monitoring control Device 201 Arithmetic circuit 203, 403 High value selection circuit 204 Converter 205, 207, 405 Setting device 206, 208, 406 Comparator a Steam b Drive steam c, d Exhaust steam e Bypass steam f Thermal drain water g, h Inside the vessel Temperature j Steam temperature k Saturation pressure m, p, r Set value n External output q Alarm

Claims (13)

A condenser that cools and condenses the steam exhausted from the steam turbine;
A turbine exhaust chamber casing that integrally covers the steam turbine and the condenser;
An atmospheric discharge plate that breaks when the pressure inside the turbine exhaust chamber casing reaches a first predetermined value;
Temperature measuring means for measuring the temperature inside the turbine exhaust chamber casing;
A first setter for setting a second predetermined value;
Based on the temperature measured by the temperature measuring means and the second predetermined value set in the first setter, the pressure corresponding to the temperature is greater than or equal to the second predetermined value relating to pressure. Or when the temperature is equal to or higher than the second predetermined value related to temperature, an output means for making an external output;
When the external output is made from the output means, discharge means for releasing the steam inside the turbine exhaust chamber casing to the outside,
An apparatus for protecting a turbine exhaust chamber and a condenser, comprising: The output means is provided with a temperature measured by the temperature measurement means, and converts the pressure into a corresponding pressure and outputs the converter,
A comparator that compares the pressure converted by the converter with the second predetermined value relating to the pressure set in the first setting device, and outputs when the pressure is equal to or higher than the second predetermined value. The apparatus for protecting a turbine exhaust chamber and a condenser according to claim 1.   The output means compares the temperature measured by the temperature measuring means with the second predetermined value related to the temperature set in the first setting device, and the temperature is equal to or higher than the second predetermined value. The turbine exhaust chamber and condenser protection device according to claim 1, further comprising a comparator that outputs when   The pressure corresponding to the second predetermined value related to the pressure set in the first setter or the second predetermined value related to the temperature set in the first setter is the first predetermined value. The turbine exhaust chamber and condenser protection device according to any one of claims 1 to 3, wherein the protection device is a lower value.   The pressure corresponding to the second predetermined value relating to the pressure set in the first setting device or the second predetermined value relating to the temperature set in the first setting device is equal to or higher than a positive pressure. The apparatus for protecting a turbine exhaust chamber and a condenser according to any one of claims 1 to 4.   The said discharge | release means is a vacuum breaker valve provided in the piping which connects the inside and the exterior of the said condenser, and is driven by DC power supply. Turbine exhaust chamber and condenser protection device. A second setter for setting a third predetermined value;
Based on the temperature measured by the temperature measuring means and the third predetermined value set in the second setter, the pressure corresponding to the temperature is greater than or equal to the third predetermined value relating to pressure. The turbine exhaust chamber according to any one of claims 1 to 6, further comprising alarm means for outputting an alarm when the temperature becomes equal to or higher than the third predetermined value related to temperature. Water device protection device. A first setter for setting a first predetermined value;
A condenser that cools and condenses steam exhausted from the steam turbine, a measured temperature inside a turbine exhaust chamber casing that integrally covers the steam turbine, and the first setter set in the first setter An output that outputs an external output when the pressure corresponding to the temperature becomes equal to or higher than the first predetermined value related to pressure, or when the temperature becomes equal to or higher than the first predetermined value related to temperature, based on the predetermined value of 1 Means,
A turbine exhaust chamber and a condenser monitoring and control apparatus comprising: The output means is provided with the measured temperature inside the turbine exhaust chamber casing, and converts the pressure into a corresponding pressure and outputs the converter,
A comparator that compares the pressure converted by the converter with the first predetermined value related to the pressure set in the first setter, and outputs when the pressure exceeds the first predetermined value. The turbine exhaust chamber and condenser monitoring and control device according to claim 8.   The output means compares the measured temperature inside the turbine exhaust chamber casing with the first predetermined value related to the temperature set in the first setter, and the temperature is the first value. 9. The turbine exhaust chamber and condenser monitoring and control device according to claim 8, further comprising a comparator that outputs a predetermined value or more.   The first predetermined value related to the pressure set in the first setter or the pressure corresponding to the first predetermined value related to the temperature set in the first setter is the first predetermined value. The monitoring control device for a turbine exhaust chamber and a condenser according to any one of claims 8 to 10, wherein the monitoring control device has a lower value.   The pressure corresponding to the first predetermined value relating to the pressure set in the first setting device or the first predetermined value relating to the temperature set in the first setting device is equal to or higher than a positive pressure. The turbine exhaust chamber and condenser monitoring and control device according to any one of claims 8 to 11. A second setter for setting a second predetermined value;
Based on the temperature measured by the temperature measuring means and the second predetermined value set in the second setter, the pressure corresponding to the temperature is greater than or equal to the second predetermined value relating to pressure. The turbine exhaust chamber and recovery unit according to any one of claims 8 to 12, further comprising alarm means for outputting an alarm when the temperature reaches or exceeds the second predetermined value related to temperature. Water monitor monitoring and control device.

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