JP2001033001A - Steam supply system with set-up time calculation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable the operation of a steam boiler to start at the most appropriate timing by correctly calculating a set-up time for steam supply. SOLUTION: A steam supply system comprises a steam boiler 1, steam supply piping 2 and a controller 4, wherein the controller 4 includes a pipe warming time storage device 7 and a set-up time calculation circuit 8, and the steam supply pipe 2 connects the steam boiler 1 and use points 9 to feed steam generated in the steam boiler 1 to the use points 9. The pipe warming time storage device 7 stores therein pipe warming time that is the time required for warming the steam piping as far as the use points 9, while the set-up time calculation circuit 8 calculates time that is earlier than input time, at which the use of steam starts in the use points 9, by preparation time, which is the total of steam starting time required for generating steam in the boiler and the pipe warming time, as the start time of boiler operation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steam supply device provided with a preparation time calculation device.

[0002]

2. Description of the Related Art In a plant using steam, a steam supply pipe is connected between a steam boiler and a point of use, steam is generated by operating the steam boiler, and steam is supplied to the point of use. During a cold start of the steam boiler, the steam boiler cannot start producing steam until the internal boiler reaches the boiling temperature even after the steam boiler starts operating. Need to start before. The steam generated by the steam boiler is sent through a steam supply pipe.If the temperature of the steam supply pipe is low, the heat of the steam is used to heat the steam supply pipe, and the temperature of the steam in the steam supply pipe is reduced. Therefore, it is necessary to perform a warm-up operation in which the steam supply pipe is heated in advance.

[0003] The steaming time from when the operation switch of the steam boiler is turned on until the start of generation of steam is almost constant for each boiler, but the time required for the warm tube operation differs for each use point of steam. It is necessary for the boiler operator to start the operation of the boiler earlier than the time required for preparing the steam supply from the start time of using steam at the use point, and if there are multiple use points, the boiler Complicated work of finding the operation start time and selecting the earliest time from it was necessary. The preparation time is calculated by the boiler operator, but it is troublesome to calculate the preparation time accurately, and if the operation start of the boiler is too early, the boiler is wastefully operated, and the operation start is too slow. When the steam at the use point is needed, a problem occurs that the steam cannot be made in time.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to accurately calculate a preparation time for steam supply and to start operation of a steam boiler at an optimum timing.

[0005]

A steam supply device having a steam boiler, a steam supply pipe, and a control device, wherein the control device has a warm pipe operation time storage device and a preparation time calculation circuit, The supply pipe connects the steam boiler and the point of use, and sends the steam generated by the steam boiler to the point of use. The warm pipe operation time storage device is required for the warm pipe operation of the steam pipe to the point of use. The warm-up operation time, which is the time, is stored, and the preparation time calculation circuit calculates the steaming time, which is the time required for the steam generation of the boiler, from the input steam use start time at the use point,
The time earlier by the preparation time obtained by adding the warm-up operation time is calculated as the boiler operation start time.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a flow chart of a steam supply device embodying the present invention, and FIG. 2 is an explanatory diagram showing a relationship between a steam use start time at a use point and a boiler operation start time. The steam boiler 1 supplies steam to three use points 9, and the use points 9 are referred to as use points A, B, and C, respectively. The steam boiler 1 and each use point are connected by a steam supply pipe 2, and a steam header 5 is provided on the steam supply pipe 2. The steam generated in the steam boiler 1 is once sent to the steam header 5 through the steam supply pipe 2 and is sent from the steam header 5 to each use point 9, and the steam supply connected to each use point Each of the pipes 2 is provided with a steam supply control valve 6. The control of the steam boiler 1 is performed by the control device 4, and the steam boiler 1 is controlled.
Each of the operating units operates based on a signal from the control device 4.

The control device 4 is provided with a preparation time calculation device 3 and a timer device 10, and the preparation time calculation device 3 is provided with a warm-up operation time storage device 7 and a preparation time calculation circuit 8. When the steam supply control valve 6 in the middle of the steam supply pipe 2 connected to the use point requiring steam supply is opened and steam is generated by the steam boiler, the steam is sent to the use point 9 through the steam supply pipe 2. . By sending steam to the steam supply pipe 2, warm-up operation of the steam supply pipe can be performed, and the time required for the warm-up operation is determined in advance for each use point and stored in the warm-up operation time storage device 7.

Here, the warm-up operation time for warming up the steam supply pipe 2 up to the use point A is tA, the warm-up operation time of the steam supply pipe 2 up to the use point B is tB, and the steam supply up to the use point C is performed. The warm-up operation time of pipe 2 is t
C. In the normal case, the longer the length of the steam supply pipe, the longer the warm-up operation time, and each warm-up operation time is tA <tB <
tC. The steaming time, which is the time from when the operation switch of the steam boiler is turned on until the steam starts to be generated, is constant regardless of the use point at which steam is supplied, and the steaming time t1 is determined by the preparation time calculating circuit 8 Set to.

When steam is used at a plurality of use points, the operation start time of the boiler is obtained for each of the use points, and the earliest time is determined as the operation start time of the boiler. The time at which the use of steam at the use point A is started is T1, the time at which the use of steam is started at the use point B is T2, and the steam boiler 1 is in a cold state.
The case where the operation is started at an appropriate time will be described.

When the steam use start time T1 of the use point A is inputted to the preparation time calculation circuit 8, the preparation time calculation circuit 8 reads the warm-up operation time tA of the use point A from the warm-up operation time storage device 7, and performs the warm-up operation. A preparation time (tA + t1) obtained by adding the operation time tA and the steaming time t1 is obtained, and a time T3 earlier by the preparation time than the time T1 at which the use of steam at the use point A is started is obtained. Similarly, the preparation time calculation circuit 8
When the steam use start time T2 of the use point B is input, the preparation time calculation circuit 8 reads the warm-up time tB of the use-point B from the warm-up time operation time storage device 7, and the warm-up time tB and the transpiration time t1. Preparation time (tB +
t1) is obtained, and a time T4 earlier by the preparation time than the time T2 at which the use of steam at the use point B is started is obtained.

In the preparation time calculation circuit 8, the calculated time T3
And the time T4, and the earliest time is set as the boiler operation start time. In use point A and use point B,
The steaming time t1 is the same, but since the warm-up time tB is longer than the warm-up time tA, the boiler operation start time T4 is earlier than the boiler operation start time T3. Time T4 is calculated as the start time.

Time T, which is the calculated boiler operation start time
4 is sent to the timer device 10 of the control device 4 and is set to start the operation of the boiler at the calculated boiler operation start time, so that the timer device 10 starts the operation of the boiler at time T4.

[0013]

According to the present invention, the operation of the steam boiler can be started at an optimum timing.
Also, the trouble of performing complicated calculations can be saved.

[Brief description of the drawings]

FIG. 1 is a flow chart of a steam supply device embodying the present invention.

FIG. 2 is an explanatory diagram showing a relationship between a steam use start time at a use point and a boiler operation start time.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Steam boiler 2 Steam supply pipe 3 Preparation time calculation device 4 Control device 5 Steam header 6 Steam supply control valve 7 Warm-up operation time storage device 8 Preparation time calculation circuit 9 Use point 10 Timer device

Claims (5)

[Claims] 1. A steam supply device comprising a steam use start time input means, a preparation time calculation circuit, and a preparation time calculation device having a boiler operation start time output means, wherein the steam use start time input means comprises a steam use start time input means. The use start time is input to a preparation time calculation circuit, and the preparation time calculation circuit calculates a time earlier by a predetermined time from the input steam use start time as a boiler operation start time. The output means is a steam supply device provided with a preparation time calculation device for outputting the boiler operation start time calculated by the preparation time calculation circuit. 2. A steam supply device having a steam boiler, a steam supply pipe, and a control device, wherein the control device has a warm-up operation time storage device and a preparation time calculation circuit. The steam boiler is connected to the point of use and the steam generated by the steam boiler is sent to the point of use. The warm-pipe operation time storage device stores the warm-up time required for the warm-pipe operation of the steam piping section up to the point of use. The tube operation time is stored, and the preparation time calculation circuit calculates the sum of the steaming time, which is the time required for steam generation of the boiler, and the warm-up tube operation time from the input steam use start time at the use point. A steam supply device that calculates a minute earlier as the boiler operation start time. 3. The steam supply device according to claim 2, wherein when there are a plurality of use points, the warm-pipe operation time storage device stores a warm-pipe operation time for each steam pipe to each use point. The preparation time calculation circuit sets a time earlier by the preparation time obtained by adding the steaming time and the warm-up time of the corresponding use point as the boiler operation start time from the steam use start time at the input use point. Steam supply device to calculate. 4. The steam supply device according to claim 3, wherein when the start time of using steam at a plurality of use points is input to the preparation time calculation circuit, the preparation time calculation circuit performs, for each input use point, A steam supply device that obtains an earlier time corresponding to a preparation time obtained by adding a steaming time and a warm-up operation time of a corresponding use point from a steam use start time, and calculates the earliest time as a boiler operation start time. 5. The steam supply device according to claim 2, further comprising a timer device for starting operation of the steam boiler when a set time is reached in the control device, and starting the boiler operation calculated by the preparation time calculation circuit. A steam supply device having a timer start function for automatically inputting the time to the timer device and automatically starting the operation of the boiler when the boiler operation start time calculated by the preparation time calculation circuit is reached.