JP7460518B2 - Systems, methods, control devices and programs for controlling the wetness of steam - Google Patents

Description

The present invention relates to a system, method, control device, and program for controlling steam wetness.

Steam is used in various industrial processes, and its characteristics such as temperature and wetness (or dryness) are controlled depending on the purpose of use. For example, Patent Document 1 discloses a device for controlling the wetness, dryness or superheat of steam. In this device, a pressure reducing valve is provided in the steam line, and a gas-liquid separator is provided downstream of the pressure reducing valve. The gas-liquid separator receives steam containing condensate from the pressure reducing valve, removes the condensate from the steam, and allows only the steam to flow into the steam pipe. A steam flow meter is provided downstream of the gas-liquid separator. Only steam from which condensate has been separated from the gas-liquid separator flows into this steam flow meter. Therefore, the steam flow meter can accurately measure the amount of steam flowing through the steam line.

JP 2005-121262 A

In the device of Patent Document 1, since condensate is removed from steam by a gas-liquid separator, only steam having a certain degree of dryness (wetness) can be provided.

In consideration of the above-mentioned problems, the present invention aims to provide a system, method, control device, and program for controlling the humidity of steam, which can provide steam having a desired humidity. purpose.

In order to solve the above problems, a system for controlling the humidity of steam according to one aspect of the present invention has a first line through which steam passes, and an inlet connected to the first line, a pressure reducing means for converting steam into superheated steam by adiabatic expansion; a second line connected to the outlet of the pressure reducing means and passing the superheated steam; and a flow meter disposed in the first line for measuring the flow rate of the steam. , a thermometer disposed in the second line for measuring the temperature of the superheated steam; and a water supply means connected downstream of the thermometer to the second line for supplying water to the second line. , the amount of water added to the second line from the water supply means based on the flow rate of the steam as measured by the flow meter, the temperature of the superheated steam as measured by the thermometer, and the target dryness in the second line. and a control device for determining the pressure, and the set pressure at the outlet of the pressure reducing means is in a range of not less than atmospheric pressure and not more than atmospheric pressure +100 kPa .

The pressure of the superheated steam flowing through the second line may be in the range of ±10 kPa of the set pressure at the outlet of the pressure reducing means.

Another aspect of the invention is a method for controlling the wetness of steam, comprising the steps of: arranging a flow meter for measuring a flow rate of steam in a first line connected to an inlet of a pressure reducing means through which the steam passes and which converts the steam into superheated steam by adiabatic expansion; arranging a thermometer for measuring a temperature of the superheated steam in a second line connected to an outlet of the pressure reducing means and through which the superheated steam passes; connecting a water supply means for supplying water to the second line downstream of the thermometer to the second line; communicatively connecting a control device to the flow meter, the thermometer and the water supply means; and determining in the control device an amount of water to add from the water supply means to the second line based on the flow rate of steam measured by the flow meter, the temperature of the superheated steam measured by the thermometer and a target dryness fraction in the second line, wherein the set pressure at the outlet of the pressure reducing means is in the range of atmospheric pressure or more and atmospheric pressure + 100 kPa or less .

Yet another aspect of the present invention is a method for controlling the wetness of steam, comprising the steps of receiving a flow rate of steam from a flow meter disposed in a first line connected to an inlet of a pressure reducing means through which the steam passes and which converts the steam into superheated steam by adiabatic expansion, receiving a temperature of the superheated steam from a thermometer disposed in a second line connected to an outlet of the pressure reducing means and through which the superheated steam passes, accepting an input of a target dryness fraction in the second line, and determining an amount of water to be added to the second line from a water supply means based on the flow rate of steam received from the flow meter, the temperature of the superheated steam received from the thermometer, and the target dryness fraction, wherein the set pressure at the outlet of the pressure reducing means is in the range of atmospheric pressure or more and atmospheric pressure + 100 kPa or less .

Yet another aspect of the present invention is a control device for controlling the wetness of steam, configured to execute the steps of receiving a flow rate of steam from a flow meter arranged in a first line connected to an inlet of a pressure reducing means through which the steam passes and which converts the steam into superheated steam by adiabatic expansion, receiving a temperature of the superheated steam from a thermometer arranged in a second line connected to an outlet of the pressure reducing means and through which the superheated steam passes, accepting an input of a target dryness fraction in the second line, and determining an amount of water to be added to the second line from a water supply means based on the flow rate of steam received from the flow meter, the temperature of the superheated steam received from the thermometer, and the target dryness fraction , wherein the set pressure at the outlet of the pressure reducing means is in the range of atmospheric pressure or more and atmospheric pressure + 100 kPa or less .

Yet another aspect of the present invention is a program for operating a computer, which causes the computer to execute the steps of receiving a flow rate of steam from a flow meter arranged in a first line connected to an inlet of a pressure reducing means that passes the steam and converts the steam into superheated steam by adiabatic expansion, receiving a temperature of the superheated steam from a thermometer arranged in a second line that is connected to an outlet of the pressure reducing means and passes the superheated steam, accepting an input of a target dryness fraction in the second line, and determining an amount of water to be added to the second line from a water supply means based on the flow rate of steam received from the flow meter, the temperature of the superheated steam received from the thermometer, and the target dryness fraction , wherein the set pressure at the outlet of the pressure reducing means is in the range of atmospheric pressure or more and atmospheric pressure + 100 kPa or less .

The present invention makes it possible to provide steam with a desired wetness.

FIG. 1 is a schematic diagram illustrating a system for controlling steam wetness according to an embodiment. FIG. 2 shows an example of a table stored by a control device in the system of FIG. FIG. 3 is a flowchart illustrating a method for controlling steam wetness according to an embodiment.

The following describes in detail an embodiment of the present invention with reference to the attached drawings. The specific dimensions, materials, values, etc. shown in the embodiment are merely examples to facilitate understanding of the invention, and do not limit the present invention unless otherwise specified. In this specification and drawings, elements that have substantially the same functions and configurations are given the same reference numerals to avoid duplicated explanations. Also, elements that are not directly related to the present invention are not shown.

FIG. 1 is a schematic diagram illustrating a system 100 for controlling steam wetness according to an embodiment. The system 100 is applicable to a variety of industries that use steam, such as processes for manufacturing food (e.g., steaming, baking, distilling, pasteurizing, or drying), converting feed into solids, etc. process, drawing process of fibers, process of deforming wood, etc.). The industries to which the system 100 is applied are not limited to the above examples. The system 100 adjusts the steam from the steam supply means 1 to a predetermined pressure and wetness (dryness), and supplies the steam to a process that requires the steam.

The system 100 includes a steam supply means 1, a first line L1, a pressure reducing valve (pressure reducing means) 2, a second line L2, a flow meter 3, a thermometer 4, a water supply means 50, a sparge pipe 5, and a control device 6.

The steam supply means 1 is, for example, a boiler, and is connected to a first line (piping) L1. A flow meter 3 is disposed in the first line L1 and measures the flow rate M of the steam flowing through the first line L1. The flow meter 3 is connected to the control device 6 via wire or wireless communication so as to be able to communicate with the control device 6, and transmits data on the measured flow rate M to the control device 6.

The first line L1 is connected to the inlet (primary side) of the pressure reducing valve 2. The steam flowing through the first line L1 is converted to superheated steam by adiabatic expansion in the pressure reducing valve 2. The set pressure of the pressure reducing valve 2 (set pressure of the outlet (secondary side)) is a micropressure state close to atmospheric pressure (about 0.1 MPa), for example, atmospheric pressure + 100 kPa or less, preferably atmospheric pressure + 50 kPa or less, more preferably atmospheric pressure + 30 kPa or less. The wetness control described below can be achieved within the set pressure of the pressure reducing valve 2 ± 10 kPa (i.e., the pressure of the superheated steam flowing through the second line L2 can be within the set pressure of the pressure reducing valve 2 ± 10 kPa). The outlet of the pressure reducing valve 2 is connected to the second line (piping) L2, and the superheated steam from the pressure reducing valve 2 flows through the second line L2.

A thermometer 4 is disposed in the second line L2, and measures the temperature T of the superheated steam flowing through the second line L2. The thermometer 4 is communicably connected to the control device 6 by wire or wirelessly, and transmits data on the measured temperature T to the control device 6.

A water supply means 50 is connected downstream of the thermometer 4 in the second line L2, and water is supplied from the water supply means 50 to the second line L2. The water supply means 50 includes a tank 51, a third line L3, a pump 52, a valve 53, and a flow meter 54.

Tank 51 stores water. The tank 51 is connected to the third line L3, and water from the tank 51 flows through the third line L3. A pump 52 is arranged in the third line L3, and the water in the tank 51 is pumped by the pump 52. Further, a valve (for example, an electric valve) 53 is arranged in the third line L3, and the flow rate of water flowing through the third line L3 is adjusted by the valve 53. Furthermore, a flow meter 54 is disposed on the third line L3, and the flow meter 54 measures the flow rate _m1 of water flowing through the third line L3. The third line L3 is connected downstream of the flow meter 54 to the second line L2.

The pump 52, the valve 53 and the flow meter 54 are communicatively connected to the control device 6 by wire or wirelessly. The flow meter 54 transmits data of the measured flow rate _m1 to the control device 6, and the control device 6 controls at least one of the pump 52 and the valve 53 so that the flow rate _m1 measured by the flow meter 54 becomes a desired value.

The superheated steam flowing through the second line L2 is cooled by water from the water supply means 50 and converted into saturated steam (e.g., wet saturated steam) having a predetermined wetness (details will be described later). In this embodiment, the second line L2 is connected to the sparge pipe 5, and the saturated steam flowing through the second line L2 is supplied to the necessary process from the sparge pipe 5. However, the second line L2 may be connected to another device (e.g., a steamer, etc.) instead of the sparge pipe 5. Even if the saturated steam loses latent heat through use, it is kept at the saturated temperature as long as the steam is present (100°C under atmospheric pressure). Therefore, it is possible to heat an item at a constant temperature. For example, with respect to a process of steaming food, if superheated steam is used for this process, the temperature of the superheated steam will change as it loses sensible heat through use. For this reason, it may not be possible to steam food with a constant quality. In contrast, when the saturated steam according to this embodiment is used for the above process, as described above, its temperature is kept constant, so that food can be steamed with a constant quality. The superheated steam flowing through the second line L2 may be converted to dry saturated steam (wetterness of zero or nearly zero) by being cooled with water from the water supply means 50.

The control device 6 controls the system 100. The control device 6 can be a computer such as a PLC (Programmable Logic Controller), a desktop PC, a notebook PC, a server, or a tablet, and includes components such as a processor (CPU, etc.), a storage device (hard disk, ROM, RAM, etc.), a display device (liquid crystal display, touch panel, etc.), and an input device (keyboard, buttons, touch panel, etc.) (not shown). For example, the operation of the control device 6 shown below may be realized by a program stored in the storage device. In addition, the operator of the system 100 may input the target dryness D (%) of the saturated steam flowing through the second line L2 to the control device 6 via the input device.

In order to convert superheated steam flowing through the second line L2 into saturated steam having a desired wetness, the control device 6 controls the flow rate m of water to be added from the water supply means 50 to the second line L2 using a flow meter. 3, the temperature T of superheated steam measured by a thermometer, and the target dryness D in the second line L2.

Specifically, the following formulas (1) and (2) hold between the superheated steam flowing through the second line L2 (before cooling), the water added to the second line L2, and the saturated steam flowing through the second line L2 (after cooling). By substituting formula (2) into formula (1), it is possible to calculate the flow rate m of water required to obtain saturated steam having a target dryness D (i.e., a target wetness (wetness=100-D)) as shown in formula (3).
_H1M + _HWm = _H2 (M+m)... (1)
_H2 = _hk + _hsD /100... (2)
m = M ( _hk + _hsD /100 - _H1 ) / ( _-hk - _hsD /100 + _Hw ) ... (3)

here,
H ₁ : Total enthalpy of superheated steam (determined by temperature T and pressure)
_H2 : Total enthalpy of wet steam _HW : Energy of injected water M: Flow rate of superheated steam (measured with saturated steam)
m: Flow rate of water added D (%): Dryness of wet steam _hk : Sensible heat of wet steam (determined by pressure)
_hs : latent heat of wet steam (determined by pressure)

As described above, the pressure of the superheated steam flowing through the second line L2 (that is, the set pressure of the pressure reducing valve 2) is in a micro-pressure state close to atmospheric pressure, and such superheated steam has small pressure fluctuations. Therefore, the pressure required to determine H ₁ , h _k , and h _s can be considered as the set pressure of the pressure reducing valve 2 . In such a system 100, there is no need to provide a pressure gauge in the second line L2 to measure the pressure of superheated steam. Therefore, in equation (3), the measured values necessary to calculate the flow rate m of water to be added are the temperature T (° C.) of superheated steam and the flow rate M of superheated steam necessary to determine _H1 . Temperature T can be obtained from thermometer 4. The flow rate M of superheated steam flowing through the second line L2 is the same as the flow rate of steam flowing through the first line L1 obtained from the flow meter 3. Therefore, the control device 6 determines the flow rate m of water to be added from the water supply means 50 to the second line L2 based on the above equation (3).

2 shows an example of a table stored by the control device 6 in the system 100 of FIG. 1. For example, the control device 6 may store a table as shown in FIG. 2 in a storage device. This table is calculated based on the above formula (3) and shows each flow rate m 0 (m ³ /s) required to convert superheated steam of temperature T (° C.) per unit flow rate (M= ₁ (m ³ /s)) into saturated steam of dryness D (%). In this case, the control device 6 reads out the flow rate m ₀ corresponding to the dryness D and temperature T from the table based on the target dryness D input by the operator and the temperature T measured by the thermometer 4, and multiplies this flow rate m ₀ by the flow rate M measured by the flowmeter 3 to obtain the flow rate m of water to be added.

Next, the operation of the control device 6 will be explained.

FIG. 3 is a flowchart illustrating a method for controlling the wetness of steam according to an embodiment, and illustrates the operation of the control device 6. For example, the operation shown in FIG. 3 may be started after the operator inputs the target dryness D and an instruction to start supplying saturated steam.

The control device 6 receives the steam flow rate M from the flow meter 3 (step S100). Then, the control device 6 receives the superheated steam temperature T from the thermometer 4 (step S102). Then, the control device 6 receives the current water flow rate _m1 from the flow meter 54 (step S104).

Next, the control device 6 determines the flow rate m of water to be added based on the steam flow rate M received from the flow meter 3, the superheated steam temperature T received from the thermometer 4, and the target dryness fraction D input by the operator, based on the above formula (3) (or based on a table such as that shown in Figure 2 obtained from the above formula (3)) (step S106).

Next, the control device 6 controls the water supply means 50 (at least _one of the pump 52 or the valve 53) so that water at a flow rate m is supplied from the water supply means 50 to the second line L2 based on the flow rate m1 received in step S104 and the flow rate m determined in step S106 (step S108).

The control device 6 may repeat the above steps S100 to S108 at a predetermined interval (e.g., one hundred to several hundred milliseconds, one to several seconds, ten to several tens of seconds, or one to several minutes) until an arbitrary instruction (e.g., an instruction to stop the supply of saturated steam) is input by the operator.

The system 100 as described above includes a first line L1 through which steam passes, a pressure reducing valve 2 that has an inlet connected to the first line L1, and converts the steam into superheated steam by adiabatic expansion, and a pressure reducing valve. A second line L2 is connected to the outlet of the second line L2 and passes the superheated steam, a flow meter 3 is arranged in the first line L1 and measures the flow rate M of the steam, A thermometer 4 for measuring the temperature T of steam, a water supply means 50 connected downstream of the thermometer 4 to the second line L2 and for supplying water to the second line L2, and a flow meter 3 Water to be added from the water supply means 50 to the second line L2 based on the steam flow rate M measured by the steam flow rate M, the temperature T of the superheated steam measured by the thermometer 4, and the target dryness D in the second line L2. and a control device 6 that determines the flow rate m. According to the system 100, the flow rate m of water to be added to the superheated steam can be automatically determined by the control device 6 in order to obtain saturated steam having the target dryness D (i.e., the target wetness). can. Therefore, steam having a desired wetness can be provided.

Further, in the system 100, the set pressure at the outlet of the pressure reducing valve 2 is in a range of equal to or higher than atmospheric pressure and equal to or lower than atmospheric pressure +100 kPa. In such a low pressure state, the pressure fluctuation of the superheated steam is small, so the pressure required to determine the parameters H1, hk, and hs necessary to determine the flow rate m can be regarded as the set pressure of the pressure reducing valve 2. Can be done. For example, the pressure of the superheated steam flowing through the second line L2 is within the range of the set pressure at the outlet of the pressure reducing valve 2 ±10 kPa. Therefore, the calculation for determining the flow rate m can be simplified. Furthermore, as mentioned above, the pressure required to obtain the parameters H1, hk, and hs can be considered as the set pressure of the pressure reducing valve 2, so the pressure of the superheated steam is measured for the second line L2. There is no need to provide a pressure gauge for this purpose. Therefore, the configuration of the system 100 can be simplified.

In addition, in the system 100, among the components shown in FIG. 1, the flow meter 3, the thermometer 4 and the water supply means 50 may be retrofitted to an existing system including the steam supply means 1, the first line L1, the pressure reducing valve 2 and the second line L2. That is, the method for controlling the wetness of steam according to the embodiment includes the steps of: arranging a flowmeter 3 for measuring the flow rate M of steam in a first line L1 connected to the inlet of a pressure reducing valve 2 through which steam passes and converts the steam into superheated steam by adiabatic expansion; arranging a thermometer 4 for measuring the temperature T of the superheated steam in a second line L2 connected to the outlet of the pressure reducing valve 2 and through which the superheated steam passes; connecting a water supplying means 50 for supplying water to the second line L2 downstream of the thermometer 4 with respect to the second line L2; connecting a control device 6 to the flowmeter 3, the thermometer 4, and the water supplying means 50 in a communicative manner; and determining, in the control device 6, the flow rate m of water to be added from the water supplying means 50 to the second line L2 based on the flow rate M of steam measured by the flowmeter 3, the temperature T of the superheated steam measured by the thermometer 4, and the target dryness D in the second line L2. According to this method, steam having a desired wetness can be provided by retrofitting the above-mentioned components to an existing system. The control device 6 may already be provided in an existing system, and the program for executing the above operations may be installed later in the storage device of the existing control device 6. Alternatively, the control device 6 that pre-stores the program for executing the above operations may be attached later to an existing system, similar to the flowmeter 3, thermometer 4, and water supply means 50 described above.

The method executed in the control device 6 also includes a flow meter 3 disposed in a first line L1 connected to an inlet of a pressure reducing valve 2 through which steam passes and which converts the steam into superheated steam by adiabatic expansion. and receiving the temperature T of the superheated steam from the thermometer 4 arranged in the second line L2 connected to the outlet of the pressure reducing valve 2 and through which the superheated steam passes. , a step of receiving an input of the target dryness D in the second line L2, and based on the steam flow rate M received from the flow meter 3, the temperature T of the superheated steam received from the thermometer 4, and the target dryness D. , determining the flow rate m of water to be added from the water supply means 50 to the second line L2.

The control device 6 is also configured to execute the steps of receiving the steam flow rate M from a flowmeter 3 arranged on a first line L1 connected to the inlet of a pressure reducing valve 2 that passes steam and converts the steam into superheated steam by adiabatic expansion, receiving the temperature T of the superheated steam from a thermometer 4 arranged on a second line L2 that is connected to the outlet of the pressure reducing valve 2 and passes the superheated steam, accepting an input of a target dryness fraction D in the second line L2, and determining the flow rate m of water to be added from the water supply means 50 to the second line L2 based on the steam flow rate M received from the flowmeter 3, the superheated steam temperature T received from the thermometer 4, and the target dryness fraction D.

The program stored in the control device 6 causes the control device 6 to execute the steps of receiving the steam flow rate M from a flowmeter 3 arranged on a first line L1 connected to the inlet of a pressure reducing valve 2 that passes steam and converts the steam into superheated steam by adiabatic expansion, receiving the temperature T of the superheated steam from a thermometer 4 arranged on a second line L2 that is connected to the outlet of the pressure reducing valve 2 and passes superheated steam, accepting input of a target dryness fraction D in the second line L2, and determining the amount of water m to be added to the second line L2 from the water supply means 50 based on the steam flow rate M received from the flowmeter 3, the superheated steam temperature T received from the thermometer 4, and the target dryness fraction D.

The above-described method, control device 6, and program can provide steam with the desired wetness, similar to the above-described system 100.

Although preferred embodiments of the present invention have been described above with reference to the accompanying drawings, it goes without saying that the present invention is not limited to these embodiments. It is clear that those skilled in the art can come up with various changes and modifications within the scope of the claims, and these naturally fall within the technical scope of the present invention. Understood. Furthermore, the steps of the methods of the embodiments described above do not have to be performed in the order described above, and may be performed in a different order as long as there is no technical inconsistency.

For example, in the above embodiment, the pressure reducing valve 2 is used as a pressure reducing means for converting the steam flowing through the first line L1 into superheated steam by adiabatic expansion. However, in other embodiments, other pressure reducing means (e.g., a control valve) may be used instead of the pressure reducing valve 2. For example, when a control valve is used, a pressure gauge may be added to the second line L2, and the pressure of the superheated steam flowing through the second line L2 may be measured by the pressure gauge, and the steam flowing through the first line L1 may be converted into superheated steam of a desired pressure (set pressure) by the control valve based on the measured pressure. However, even in this case, it is not necessary to use the value of the pressure gauge added to the second line L2 in the calculation of the above formulas (1), (2), and (3) for calculating the flow rate m of water to be added from the water supply means 50 to the second line L2 to obtain saturated steam having a desired wetness.

2 Pressure reducing valve (pressure reducing means)
3 Flow meter 4 Thermometer 6 Control device 50 Water supply means 100 System D Target dryness L1 First line L2 Second line m Flow rate of water added from the water supply means to the second line M The first line Flow rate of steam flowing T Temperature of superheated steam flowing through the second line

Claims (6)

a first line through which steam passes;
a pressure reducing means having an inlet connected to the first line for converting the steam into superheated steam by adiabatic expansion;
a second line connected to the outlet of the pressure reducing means for passing superheated steam;
a flow meter disposed in the first line for measuring a flow rate of steam;
a thermometer disposed in the second line for measuring a temperature of the superheated steam;
a water supply means connected to the second line downstream of the thermometer for supplying water to the second line;
a control device that determines an amount of water to be added to the second line from the water supply means based on a flow rate of the steam measured by the flow meter, a temperature of the superheated steam measured by the thermometer, and a target dryness fraction in the second line;
Equipped with
A system for controlling the wetness of steam , wherein the set pressure at the outlet of the pressure reducing means is in the range of atmospheric pressure or more and atmospheric pressure + 100 kPa or less . The system for controlling the wetness of steam according to claim 1, wherein the pressure of the superheated steam flowing through the second line is in the range of ±10 kPa of the set pressure at the outlet of the pressure reducing means. a flow meter for measuring a flow rate of the steam in a first line connected to an inlet of a pressure reducing means through which the steam passes and which converts the steam into superheated steam by adiabatic expansion;
a thermometer for measuring a temperature of the superheated steam in a second line connected to an outlet of the pressure reducing means and passing the superheated steam;
connecting a water supply means to said second line downstream of said thermometer for supplying water to said second line;
a control device communicatively connected to the flow meter, the thermometer, and the water supply means;
determining, in the control device, an amount of water to be added from the water supply means to the second line based on a flow rate of the steam measured by the flow meter, a temperature of the superheated steam measured by the thermometer, and a target dryness fraction in the second line;
Including,
A method for controlling the wetness of steam , wherein the set pressure at the outlet of the pressure reducing means is in the range of atmospheric pressure or more and atmospheric pressure + 100 kPa or less . receiving a flow rate of the steam from a flow meter disposed in a first line connected to an inlet of a pressure reducing means through which the steam passes and converts the steam to superheated steam by adiabatic expansion;
receiving a temperature of the superheated steam from a thermometer connected to an outlet of the pressure reducing means and disposed in a second line through which the superheated steam passes;
receiving an input of a target dryness fraction in the second line;
determining an amount of water to be added to the second line from a water supply means based on the flow rate of the steam received from the flow meter, the temperature of the superheated steam received from the thermometer, and the target dryness fraction;
Including,
A method for controlling the wetness of steam , wherein the set pressure at the outlet of the pressure reducing means is in the range of atmospheric pressure or more and atmospheric pressure + 100 kPa or less . receiving a flow rate of the steam from a flow meter disposed in a first line connected to an inlet of a pressure reducing means through which the steam passes and converts the steam to superheated steam by adiabatic expansion;
receiving a temperature of the superheated steam from a thermometer connected to an outlet of the pressure reducing means and disposed in a second line through which the superheated steam passes;
receiving an input of a target dryness fraction in the second line;
determining an amount of water to be added to the second line from a water supply means based on the flow rate of the steam received from the flow meter, the temperature of the superheated steam received from the thermometer, and the target dryness fraction;
is configured to run
A control device for controlling the wetness of steam, wherein the set pressure at the outlet of the pressure reducing means is in the range of atmospheric pressure or more and atmospheric pressure + 100 kPa or less . receiving a flow rate of the steam from a flow meter disposed in a first line connected to an inlet of a pressure reducing means through which the steam passes and converts the steam to superheated steam by adiabatic expansion;
receiving a temperature of the superheated steam from a thermometer connected to an outlet of the pressure reducing means and disposed in a second line through which the superheated steam passes;
receiving an input of a target dryness fraction in the second line;
determining an amount of water to be added to the second line from a water supply means based on the flow rate of the steam received from the flow meter, the temperature of the superheated steam received from the thermometer, and the target dryness fraction;
Run the following on your computer :
The program , wherein the set pressure at the outlet of the pressure reducing means is in the range of atmospheric pressure or more and atmospheric pressure + 100 kPa or less.

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