JPH07217808A - Steam supply using system - Google Patents

Abstract

PURPOSE:To prevent adverse influence of a temporarily occurring pressure drop to a steam using facility at the time of switching to other steam boiler when a malfunction occurs or at the time of simultaneously opening a plurality of steam supply passages, etc. CONSTITUTION:A relative steam generation amount insufficiency occurring dose to a large using steam flow rate of steam using facilities 5A, 5B is decided for present steam generation amount of steam boilers 1. Steam valves 7A, 7B are sequentially closed from a low priority order based on predetermined priority order information when the relative steam generation amount insufficiency is decided, and the closed valve is opened when the insufficiency is eliminated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steam supply system comprising steam-using equipment such as a heater or food machine that uses steam and steam-generating equipment including a plurality of steam-generating means for supplying steam to these steam-using equipment. It is about the system used.

[0002]

2. Description of the Related Art In such a steam supply and use system, control of steam supply to a steam use facility, that is, control of a steam valve provided in a steam supply path and control of the number of steam generating means of a steam generating side facility are independent. It was common practice.
And as the steam use equipment in the steam generation side equipment of the conventional system, it is necessary to maintain the temperature for production and it is not allowed to stop the supply of steam or stop the pressure even for a short time, such as a heater etc. In that case, even if the supply of steam is stopped, there is little effect. In general, steam generating equipment is designed with a margin for the total steam generation amount with respect to the total load (total steam flow rate) of these steam using equipment.

[0003]

However, in such a conventional steam supply / use system, when switching to another steam generation means when an abnormality occurs in one steam generation means, or when simultaneously opening a plurality of steam supply paths, etc. , Causing a temporary pressure drop. If such a pressure drop becomes large, there is a problem that it has an adverse effect on the steam using equipment that requires strict steam supply management as described above.

[0004]

The present invention has been made for the purpose of solving the above-mentioned problems, and the invention of claim 1 includes a plurality of steam-using facilities and a plurality of steam-generating means. , A steam collecting section for collecting the steam output from the steam generating means, a plurality of steam supply paths branched from the steam collecting section to supply steam to the steam using equipment, and steam supplying to each steam using equipment. Multiple steam valves to control,
What comprises a number control means for controlling the operating number of steam generating means, and a valve control means for controlling the opening and closing of the plurality of steam valves, wherein the steam used by the steam using facility with respect to the amount of steam generated by the steam generating means The steam generation amount shortage determination means for determining the relative steam generation amount shortage caused by the large flow rate, the setting means for setting the priority information for opening and closing the steam valve, and the priority information set by this setting means When the relative shortage of steam generation is determined by the storage means for storing and the shortage of steam generation determination means, the steam valves are closed from the lowest priority based on the priority information to eliminate the shortage of relative steam. And a valve control means for opening a closed steam valve,

According to a second aspect of the present invention, in the first aspect, the steam generation amount insufficiency determining means is composed of steam pressure detecting means in the steam collecting section, and the pressure detected by the steam pressure detecting means is equal to or lower than a preset reference pressure. In that case, it is characterized by determining that the relative steam generation amount is insufficient,

According to a third aspect of the present invention, in the second aspect, the steam generation amount calculation means for calculating the steam generation amount based on the operating condition of the steam generation means by the unit number control device and the valve opening / closing signal of the valve control means are provided. Setting means for setting the steam flow rate information of each of the related steam supply paths, and storage means for storing the steam flow rate information set by the setting means,
A virtual use steam flow rate calculation means for calculating a virtual use steam flow rate from the valve opening / closing signal output from the valve control means and the steam flow rate information, and a pressure gradient calculation means for calculating the gradient of the pressure detected by the steam pressure detection means. And a valve control means for closing a low-priority steam valve based on the priority information when the current steam generation amount is equal to or less than the virtual steam flow rate and the pressure gradient satisfies a downward trend condition. Characterized by

According to a fourth aspect of the present invention, in the second aspect, the pressure gradient calculating means for calculating the gradient of the pressure detected by the vapor pressure detecting means and the predetermined reference pressure based on the pressure gradient under the condition that the detected pressure is decreasing. Arrival time calculating means for calculating the arrival time to reach, and means for determining whether there is a start instruction of the steam generating means with a delay in output,
When the presence of the activation instruction is determined, the delay time from the present time to the activation is compared with the minimum arrival time, and when the former is longer than the latter, valve control means for closing the steam valve based on the priority information is provided. Characterized by having,

[0008]

According to the means of claim 1, when it is judged that the relative amount of steam generated is insufficient, the steam valve with the lower priority is closed, so that the steam valve with the higher priority is kept open and there is no problem. Required steam is supplied to the steam facility.
Then, when the relative shortage of steam generation is eliminated, the closed steam valve is opened, and steam is supplied to all required steam use equipment. According to the means of claim 2, claim 1
In addition to the above action, if it is determined that the supply steam pressure is lower than the predetermined reference pressure, the steam valve with the lower priority will be closed, so the steam valve with the higher priority will be kept open, and the steam usage facility will not be affected. The steam required for is supplied.
According to the means of claim 3, in addition to the effect of claim 2, the condition that the generated steam amount is less than the virtual used steam flow rate and the pressure gradient shows a downward tendency even if the detected pressure is equal to or higher than the predetermined reference pressure. When the above condition is satisfied, the steam valve having a lower priority is closed based on the priority information, so that the excess or deficiency of the steam generation amount is more finely detected and the possibility that the supply steam pressure becomes equal to or lower than the predetermined reference pressure is reduced. According to the means of claim 4, in addition to the operation of claim 2, when there is a start instruction of the steam generating means accompanied by output delay even if the detected pressure is equal to or higher than the predetermined reference pressure, the pressure drop time and Since the steam valve is controlled to be opened / closed in consideration of the output delay time, the possibility that the steam pressure will be equal to or lower than the predetermined reference pressure is reduced.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A steam supply and use system of a preferred embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, 1 is a plurality of steam boilers as steam generating means,
Each is equipped with a combustion device 2 as a heating means for vaporizing water. In the illustrated example, the boiler 1 is a once-through steam boiler, the combustion device 2 is a gas burner oil-fired burner, etc., and the combustion device 2 is in a stopped state, a low combustion (low combustion) state, and a high combustion (high combustion) state. Therefore, the steam boiler 1 is configured so as to be able to take three output states: an output stop state, a low output state, and a high output state. The output characteristics of each boiler, that is, the low fuel vaporization amount and the high fuel vaporization amount are respectively R
L1 and RH1 (unit is kg / h), and in this embodiment, RH1≈2 × RL1 is set, but the present invention is not limited to this.
The evaporation amount and the steam generation amount have the same meaning.

Then, the boiler 1 in the stopped state has a predetermined time T seconds for pre-purge (scavenging), ignition, etc. from the input of the low fuel start signal to the start of combustion, strictly speaking, until evaporating. It has the required delayed activation characteristic. It should be noted that any type of boiler may be used as long as it can generate steam, and it is possible to use a steam boiler of a water tube type or a furnace tube type other than the once-through type, and as the heating means, an induction heating means other than the combustion device, an electric heater. The heating means or the like can be used.

The boiler 1 has a plurality of units n (an integer of ≧ 2),
In the illustrated example, four units having the same output specifications are installed side by side, and the steam output passages 3 ... Of each boiler 1 are connected to a steam header 4 as a common steam collecting section, and from this header 4 a steam supply passage (steam line). ) 6A, 6B, 6C are branched and connected to supply steam to a plurality of steam using facilities 5A, 5B, 5C. Distribution of each steam in each steam supply path,
As a result, the steam supply to the corresponding steam supply equipment is turned on and off.
Steam valves 7A, 7B and 7C for FF control are provided. It should be noted that the steam use facility includes a heater, a food machinery facility that directly uses steam, a factory facility, and the like. The maximum steam flow rate, the minimum steam flow rate, and priority information regarding valve opening / closing are used as the steam information during use of these steam supply paths 6A, 6B, and 6C, but as shown in FIG. 2, the maximum steam flow rates are RHa, RHb, and RHC (unit: kg / h), each minimum steam flow rate is RLa, RLb, RLc (unit: kg / h)
h), the priority information indicates the priority of steam supply for opening the valve by 2, 1, and 3, and the priority of closing the valve is the opposite. The steam flow rate information is empirically or calculated in advance, and the priority information is determined in consideration of the type of steam equipment used and specifications such as steam pressure required by the equipment.

Reference numeral 8 is a pressure sensor as a load change detecting means for detecting an actual change in the steam load as a change in the steam state, specifically, a change in the steam pressure inside the steam header 4, and 9 is a unit number control including a microcomputer or the like. The device controls the number of operating steam boilers 1 in accordance with a predetermined start and stop priority order so that the pressure detected by the pressure sensor 8 becomes a target steam pressure PC having a certain control width, for example. This control method is well known and is disclosed in, for example, Japanese Patent Publication No. 60-42363. In the present embodiment, the control of the number of operating machines means control of the number of steam boilers 1 ... Stopping, low combustion, and high combustion.

M1 is each steam boiler 1 as shown in FIG.
.. Operation priority, that is, start priority of four steam boilers (in this case, stop priority is reversed), low fuel evaporation, high fuel evaporation, current output status, current Reading and writing are controlled by a central processing unit (not shown) of the number-of-units control device 9 by a second storage means that stores delayed activation information indicating whether or not the transition from stop to low output is in progress. S1 is a first setting means for setting information such as a driving priority.

Reference numeral 10 denotes a valve control device including a microcomputer or the like, which controls opening / closing of the steam valves 7A, 7B, 7C in accordance with a processing procedure stored in advance. S2 is the maximum steam flow rate RHa in each of the steam supply paths 6A, 6B, 6C.
.., minimum steam flow rate RLa ..., second setting means for manually setting control information such as use steam information including use priority information (valve opening / closing priority information) and valve opening / closing information, M2 is second setting In-use steam information set by the means S2 and opening / closing of the steam valve at the present time (ON-O
FF) state, a second storage means for storing closing processing information such as whether or not the opened valve is temporarily closed,
The stored contents are stored in a table format as shown in FIG. 2, for example, so that the in-use steam information such as the maximum steam flow rate and the minimum steam flow rate information of the steam supply path can be read out based on the valve opening / closing information.

M3 is a third storage means for storing the valve opening / closing information set by the second setting means S2. As shown in FIG. 4, the set valve opening / closing information is stored in the steam valves 7A, 7A.
The open / close state information of ON (open) or OFF (closed) of B and 7C and the open / close time information are transmitted to the respective steam valves at the set time, whereby the open / close control of each steam valve is performed. It If there is no time setting, the valve opening / closing information is immediately transmitted to each steam valve.

Next, the operation of the above embodiment will be described with reference to FIG. First, when the system is started up, the first setter S1 of the number-of-units control device 9 is used to input the start priority order, the low-fuel evaporation amount, and the high-fuel evaporation amount of each steam boiler 1, and the first storage means M is entered.
Store in 1. Also, using the second setting device S2 of the valve control device 10, the steam information during use is input and stored in the second storage means M2, and the valve opening / closing information is input when necessary, and the third storage is performed. It is stored in the means M3.

First, in step S1 (hereinafter SN means processing step SN), it is determined whether or not the pressure detected by the sensor 8 is equal to or higher than a predetermined minimum reference pressure P0 (<target vapor pressure PC). Here, NO is determined, that is, a relative shortage of steam generation caused by a large flow rate of steam used by the steam using facility with respect to the current steam generation (output) quantity based on the number of operating steam boilers 1 is determined. Then, the process proceeds to S2, and the low-priority steam valve among the currently open steam valves is closed, and the closing process information "1" indicating that the closing process information is closed is stored in the second storage means M2. When there is no closing valve, the process returns to S1. Post-processing of S2 is S3
Go to and determine if the detected pressure is at least the minimum reference pressure. Here, a certain fixed time is set, and it is determined whether or not the detected pressure reaches the predetermined reference pressure P0 within that time. In the case of NO, the process returns to S2, and the steam valve having the next lower priority (higher priority than the valve closed earlier) is closed. The steam pressure is recovered by opening the steam valve in S2, and if YES is determined in S3, the steam valves closed earlier in S2 are opened in descending order of priority in S2. After opening, the closing process information in the second storage means is returned to the original "0". Next, in S5, it is determined whether or not the gradient of the detected pressure indicates a decrease. If YES, stop at S5, N
In the case of O, it is determined from the closing process information of FIG. 2 whether or not there is a valve that should be opened in S6, that is, a valve that has not been opened among the steam valves that have been closed in S2. NO in S6
In the case, the process returns to S3, and the opening process of the valve having the second highest priority (lower priority than the previously opened valve) is performed after S4. If YES, the process returns to S1. If YES is determined in S1, the process proceeds to S7, and if there is a valve opening / closing instruction by the valve control device 10, the valve opening / closing is performed according to the instruction and the process returns to S1. The determinations of S1 and S5 may be detected vapor pressure> predetermined reference pressure.

In this way, the steam pressure is detected, and the temporary excess or deficiency of the steam supply (generation) amount is detected. When the steam pressure is insufficient, the steam valve with a low priority is closed to recover the steam pressure, When the condition is restored, the closed steam valve can be opened to supply steam to the facility using steam, which is required to be opened and closed as usual, while maintaining the required steam pressure.

Next, a second embodiment of the present invention will be described with reference to FIG. 6 shows the valve control device 1 of FIG.
Compared with FIG. 5, S11 is S1, S12 is S2, S13 is S3, and S is a different processing procedure performed by 0.
14 corresponds to S4, S15 corresponds to S6, and S17 corresponds to S7, which are the same as those in FIG. Figure 5
4 is different from FIG. 4 in that the process of S16 is added before S17 in the process when it is determined in S11 (S1 in FIG. 5) that the relative steam generation amount is not insufficient. That is, when it is determined in S11 that there is no shortage of the relative steam generation amount, the process proceeds to S16, in which the sum of the minimum steam flow rates from the open / closed state of the steam valve in FIG.
+ RLb) is calculated, and the current total amount of evaporation (RL1 + RL2 in the case of FIG. 3) is calculated from the combustion state of the steam boiler shown in FIG. 3, and the current total amount of evaporation is <total of minimum steam flow rate and gradient of steam pressure Is falling (negative) is determined. The vapor pressure gradient is obtained by calculating the temporal change in the pressure detected by the sensor 8. If the determination in S16 is YES, that is, if the current steam supply amount is relatively insufficient from the open / closed state of the valve and the pressure drops, the process proceeds to S12, and the above S12 to S15 are performed.
The steam pressure recovery process is performed. In the meantime, the unit number control device 1
If 0 is determined in S16 by increasing the number of operating vehicles, the process proceeds to S17. Here, if there is a valve opening / closing instruction from the valve control device 10, the valve opening / closing is performed according to the instruction, and the process returns to S11. In this embodiment, it can be said that the determination of the relative steam generation amount insufficiency in S16 is added in order to more rigorously determine the relative steam generation amount insufficiency in the process of S11. The possibility that the excess or deficiency of the amount will be detected more finely and the pressure of the steam supplied to the steam using facility will fall below a predetermined reference pressure is reduced.

Next, a third embodiment of the present invention will be described with reference to FIG. What is shown in FIG. 7 is the valve control device 1 of FIG.
In a different processing procedure performed by 0, S21 is S1, S22 is S2, S23 is S3, and S23 are compared with FIG.
Since 24 corresponds to S4, S25 corresponds to S6, and S30 corresponds to S7, which are the same as those in FIG. 5, description thereof will be omitted. 7 is different from FIG. 5 in that, in S21 (S1 in FIG. 5), when the relative steam generation amount is determined to be sufficient, the processes of S26 to S29 are added before S17. . That is, when it is determined in S21 that there is no shortage of the relative steam generation amount, the process proceeds to S26 and it is determined whether the pressure is decreasing (the pressure gradient is negative). If YES is determined, the process proceeds to S27, and the reference pressure arrival time until the predetermined reference pressure P0 is reached is calculated based on the present detected pressure and the present pressure gradient. Next, in S28, it is determined from FIG. 3 whether or not there is a steam boiler for which delayed activation is instructed at the present time. If YES is determined, in S29, the reference pressure arrival time obtained in S27 is compared with the delay time (time obtained by subtracting the elapsed time from the boiler start instruction time during stop to the present time from the above time T), and the delay time> In the case of the reference pressure reaching time, the process proceeds to S22 and the steam pressure recovery process of S22 to S25 is performed. If NO is determined in S29, S
If NO is determined in 28 or S26, the process proceeds to S30, and if there is a valve opening / closing instruction from the valve control device 10, the valve is opened / closed according to the instruction and the process returns to S11. The determination in S29 may be delay time ≧ reference pressure arrival time. In this embodiment, by adding the processing of S26 to S29, that is, the processing of temporarily determining the shortage of the relative steam generation amount due to the delayed start of the steam boiler, the supply steam pressure becomes equal to or lower than the minimum reference pressure due to the delayed start. Fear is reduced.

It should be noted that the present invention is not limited to the above-mentioned embodiment, but it is desirable that the valve opening process after the valve having the lower priority is closed and the steam pressure is recovered is performed in the order of priority opposite to the closing. , You may ignore the priority order.

Further, the number-of-units control device 9 is provided with a control means for controlling the operating number of steam boilers by the pressure detected by the sensor 8 and the target steam pressure PC. In addition to this means, the valve control device 10 shown in FIG. The in-use steam information (minimum steam flow rate, maximum steam flow rate) of each steam supply path related to valve opening and closing as shown in FIG. 3 is set by the setting means S2, and the in-use steam information set by this setting means is stored in the storage means M2. And the valve control means 10 for receiving via the transmission line 11
Initial value of the number of operating steam boilers based on the in-use steam information obtained according to the valve opening / closing information from (Operation of the steam boiler to be in a low output state calculated based on the sum of the minimum flow rate information of each steam supply path) (Including the initial value of the number of steam generators and the initial value of the maximum number of steam generators calculated based on the sum of the maximum flow rate information of each steam supply path) Are also included in the embodiments of the present invention.

According to this embodiment, the operating number is directly calculated based on the valve opening / closing information from the valve control device 10 which controls the steam valve of each steam supply passage.
As a result, the operation of the steam boiler 1 is controlled, and the supplied steam amount is controlled with good responsiveness to changes in the steam load used.
Further, by setting the steam flow rate as the in-use steam information in advance by the setting means S2, it is read from the storage means M2 based on the valve opening / closing information from the valve control device 10 which controls the steam valve of each steam supply path. The initial value of the number of operating steam boilers 1 is calculated based on the generated steam flow rate, and the operation of the steam boiler 1 is initially controlled by the number-of-units control device 9 based on the calculated initial value of the operating number of steam boilers 1 as well as the actual load. The initial value of the number of operating units is corrected based on the steam state such as the steam pressure, and the effect is that the supplied steam amount is controlled with good response to changes in the steam load used.

Further, according to the embodiment, the minimum flow rate information of the steam flow rate is set in advance as the in-use steam information by the setting means S2, so that the valve control device 10 for controlling the steam valve of each steam supply passage. The initial value of the operating number of the steam boiler 1 to be kept in a low output state is calculated based on the minimum flow rate information read from the storage means M2 based on the valve opening / closing information from The operation of the steam boiler 1 is initially controlled by the control device 9, and the initial value of the number of operating units is corrected based on the steam state such as the steam pressure due to the actual load change, and the supply steam amount is responsive to changes in the steam load used. Has the effect of being controlled.

Further, according to the embodiment, the maximum flow rate information of the steam flow rate is previously set as the in-use steam information by the setting means S2, so that the valve control device 10 for controlling the steam valve of each steam supply passage. The maximum operating number of steam boilers 1 is calculated on the basis of the maximum flow rate information read from the storage means M2 based on the valve opening / closing information, and the number control device 10 operates based on the calculated maximum operating number. The number of operating steam boilers 1 is limited, and the operation of an excessive number of steam boilers 1 is suppressed.

Further, as an embodiment of the present invention, a system in which the valve control device 10 and the unit number control device 9 of FIG. 1 are mechanically and electrically integrated is also included. In such a case, downsizing of the control device and quantitative reduction of the storage means can be realized.

Furthermore, in the above-mentioned embodiment, the number of operating units is controlled based on the steam pressure, but a structure in which the steam temperature is detected instead of the steam pressure is also included as an embodiment of the present invention.

Further, in the above embodiment, the steam valve is turned on.
Although the OFF type two-position type is used, the present invention is also applicable to a system using a steam valve in which the degree of opening and closing can be controlled in multiple stages or in proportion. Further, examples of the present invention include a system using a plurality of steam boilers having different evaporation amounts and a system using a steam boiler capable of proportionally controlling the evaporation amounts. Further, although the steam valve is provided in the steam supply path in the above-described embodiment, the present invention can be applied to a system provided in a steam using facility.

Further, in the embodiment of FIG. 7, the delay time in S29 is mainly required for pre-purge, but each steam boiler 1 is provided with a steam pressure detector (not shown),
The delay time may be obtained by adding the estimated time required for reaching the predetermined pressure from the pressure detected by the steam pressure detector of the boiler about to start up to the time required for this pre-purge. With such a configuration, it is possible to grasp the delay time in more detail and reduce the pressure drop due to the delayed start.

Further, in each of the embodiments shown in FIGS. 5 to 7, the excess or deficiency of the relative steam generation amount is judged from the currently detected steam pressure, but the valve opening / closing information issued from the valve control device 10 is used. Even if a relative shortage of steam generation is expected, the steam valve is closed according to the priority order, and then the valve is opened / closed based on the valve opening / closing information to avoid a temporary shortage of steam pressure. It may be configured, and these are also included in the embodiments of the present invention. As a specific example in this embodiment, for example, the shortage of the relative steam generation amount is the total steam generation amount obtained from the number of operating steam boilers 1 at the present time, and the steam flow rate of the steam supply path obtained based on the valve opening / closing information. (It may be the maximum steam flow rate, or the average value of the minimum steam flow rate and the maximum steam flow rate,
It may be stored in advance and the average steam flow rate may be used) to make a judgment by comparing with the sum, and when the former is less than the latter, it is judged to be insufficient, and when insufficient, from the steam valves that are about to open, the steam valve that is about to open now. Also close the low priority steam valve,
When there is no steam valve that meets such conditions, the process of opening the steam valve, which has the highest priority among the steam valves to be opened, is sequentially performed at predetermined time intervals. In this embodiment, there is an effect that it is possible to cope with a temporary relative steam generation amount due to opening / closing of the steam valve.

Regarding the priority order for opening the steam valve in the above embodiment, the priority order at the time of system startup and the priority order after system startup may be different. Depending on the type of steam supply equipment, this may delay the supply of steam at the time of initial startup, but there is equipment where it is important to maintain the pressure once steam is supplied. The opening priority of steam valves corresponding to such equipment is set to be low at startup and high after startup. By such a method, there is an effect that the valve opening / closing control can be performed in consideration of the equipment used.

[0032]

As described above, according to the present invention, even when a temporary pressure drop occurs at the time of switching to another steam generating means when an abnormality occurs in one steam generating means, the steam having a low priority is generated. By closing the valve, it is possible to recover the supply steam pressure, and it is possible to reduce the risk of adversely affecting steam-using equipment that requires strict steam supply management.

[Brief description of drawings]

FIG. 1 is a diagram showing a system configuration of an embodiment of the present invention.

FIG. 2 is a diagram showing an example of stored contents of a storage means of the embodiment.

FIG. 3 is a diagram showing an example of contents stored in another storage means of the embodiment.

FIG. 4 is a diagram showing an example of stored contents of another storage means of the embodiment.

FIG. 5 is a diagram showing an example of a processing procedure by the number-of-units control device of the embodiment.

FIG. 6 is a diagram showing another embodiment of the processing procedure by the number-of-units control device of the embodiment.

FIG. 7 is a diagram showing another embodiment of the processing procedure by the unit number control apparatus of the embodiment.

[Explanation of symbols]

1
Steam boiler 4
Steam header 5A, 5B, 5C
Steam equipment 6A, 6B, 6C
Steam supply path 7A, 7B, 7C
Steam valve 8
Sensor 9
Number control device 10
Valve control device M1, M2, M3
Storage means S1, S2
Setting means

Claims (4)

[Claims] 1. A plurality of steam using facilities, a plurality of steam generating means, a steam collecting part for collecting steam output from the steam generating means, and a steam branching from the steam collecting part to supply steam to the steam using facility. A plurality of steam supply paths for supplying, and a plurality of steam valves for controlling the steam supply to each steam using facility,
What comprises a number control means for controlling the operating number of steam generating means, and a valve control means for controlling the opening and closing of the plurality of steam valves, wherein the steam used by the steam using facility with respect to the amount of steam generated by the steam generating means The steam generation amount shortage determination means for determining the relative steam generation amount shortage caused by the large flow rate, the setting means for setting the priority information for opening and closing the steam valve, and the priority information set by this setting means When the relative shortage of steam generation is determined by the storage means for storing and the shortage of steam generation determination means, the steam valves are closed from the lowest priority based on the priority information to eliminate the shortage of relative steam. And a valve control means for opening a closed steam valve when the steam supply system is operated. 2. The steam generation deficiency determination means according to claim 1, comprising a steam pressure detection means in the steam collecting portion,
A system for supplying and using steam, characterized in that when the pressure detected by the steam pressure detecting means is equal to or lower than a predetermined reference pressure set in advance, it is determined that the relative steam generation amount is insufficient. 3. A steam generation amount calculation means for calculating a steam generation amount based on an operating condition of the steam generation means by the unit number control device, and each steam related to a valve opening / closing signal of the valve control means. Setting means for setting the steam flow rate information of the supply path, storage means for storing the steam flow rate information set by this setting means, a valve opening / closing signal output from the valve control means, and the virtual use steam from the steam flow rate information. A virtual use steam flow rate calculation means for calculating a flow rate and a pressure gradient calculation means for calculating a gradient of the pressure detected by the steam pressure detection means are provided, and the current steam generation amount is equal to or less than the virtual use steam flow rate, and the pressure gradient is When the condition indicating the downward tendency is satisfied, the steam control device further comprises valve control means for closing a steam valve having a low priority based on the priority information. Supply system. 4. The pressure gradient calculating means for calculating the gradient of the pressure detected by the vapor pressure detecting means according to claim 2, and the arrival time for the pressure gradient to reach a predetermined reference pressure under the condition that the detected pressure is decreasing. Arrival time calculation means for calculating, and a means for determining whether or not there is a start instruction of the steam generating means with a delay in output, and a delay time from the present time to start when the presence of the start instruction is judged. And the arrival time are compared with each other, and when the former is longer than the latter, valve control means for closing the steam valve based on the priority information is provided.