JPH0639759B2 - Paper machine dryer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Industrial field of application) The present invention relates to a paper making dryer device in a paper making device.

(Prior Art) Conventionally, a papermaking dryer and its piping in a papermaking machine are generally configured as shown in FIGS. 5 and 6.

In this conventional paper making dryer device, steam from a steam source is applied to each of the paper making dryers 2a, 2b, ... Through a steam line 1, and the surfaces of the paper making dryers 2a, 2b ,. The web 3 that comes into contact with is dried.

The steam 4 discharged from each paper dryer 2a, 2b, ... Is discharged directly to the outside of the system, or is separated into condensed water and steam by a two-phase separation device 5, and the condensed water 6 is discharged to the outside of the system, The generated steam 7 is returned to another paper making dryer 2a whose vapor pressure is set to be relatively low.

(Problems to be Solved by the Invention) However, in the case of such a conventional papermaking drying apparatus, since reusable steam is directly discharged to the outside of the system, there is a problem in that energy utilization efficiency is poor.

Further, even in the case where the regenerated steam is reused by using a two-phase separator, the route for returning the regenerated steam is fixed, so even if it is better to reuse it in another paper making dryer, However, there was a problem that the objective was not sufficiently achieved from the viewpoint of energy reuse.

The present invention has been made in order to solve such a conventional problem, and can optimize the route for returning the regenerated steam, thereby improving the utilization efficiency of the regenerated steam and contributing to energy saving. An object is to provide a paper making dryer device.

[Means for Solving the Problems] (Means for Solving the Problems) A paper making dryer device of the present invention has a steam line for introducing steam from a heat steam source to a plurality of paper making dryers provided side by side, and a steam outlet side of each paper making dryer. A two-phase separator installed, a re-generated steam line that guides the re-generated steam obtained by each two-phase separator to each paper making dryer, an on-off valve that opens and closes the re-generated steam line that leads to each dryer, and Reuse calculation control means for inferring the optimum combination of papermaking dryers for reusing the regenerated steam from the two-phase separation device based on pre-stored knowledge rules, and a command for this reuse calculation control means Based on this, there is provided a valve opening / closing control means for opening / closing a predetermined opening / closing valve in order to supply the regenerated steam to an arbitrary paper making dryer.

(Operation) In the paper making dryer device of the present invention, the steam from the hot steam source can be supplied to each paper making dryer, and the regenerated steam is returned to the paper making dryer by selecting the paper making dryer with high utilization. You can

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 2 is a system diagram showing an embodiment of the present invention, showing a dryer part of a papermaking plant, and a steam line 12 is connected to a plurality of papermaking dryers 11a, 11b, 11c ,. Has been done.

Further, two-phase separators 14a, 14b ... for the discharged steams 13a, 13b, ... Are provided on the steam outlet side of each paper making dryer 11a, 11b ,. The return lines 16a, 16b, ... Of the steam 15a, 15b ...
1b, ...

An on-off valve 17a is provided in each of the return lines 16a, 16b, ....
a, 17ab, 17ac, ...; 17ba, 17bb, 1
7bc, ...; 17ca, 17cb ... are provided, and the regenerated steam 15a, 15 from any of the two-phase separators 14a, 14b ,.
b, ..., any papermaking dryer 11a, 11
b, ... Can be returned.

In FIG. 2, 18a, 18b, 18c, ... Are hot steam flow rate sensors, 19a, 19b, .. are steam pressure sensors, 20a, 20b ... are regenerated steam flow rate, pressure, temperature sensors, 21a, 21b. Is an exhaust steam flow rate sensor.

FIG. 1 shows a configuration of a control arithmetic unit 22 which calculates a combination of the open / closed states of the open / close valves 17a, 17b, 17c, ... Of the paper dryer in order to realize optimum energy utilization.

This control calculation device 22 is used for various plant information of the papermaking plant, for example, steam temperature and vapor pressure supplied to the respective papermaking dryers 11a, 11b, ..., Two-phase separation devices 14a, 14
Regenerated steam 15a, 15 from the exhaust steam in b, ...
b, ... Temperature, pressure, each paper making dryer 11a, 11b,
The surface temperature or the like of ... Is used as an input parameter, and the optimum reuse path calculation unit 23 that calculates this input parameter and the IF-T
A knowledge base 24 that stores selection information of the optimum route in the HEN rule format, an input device 25 that updates and adds data to the knowledge base 24, and a display device 26.
And the open / close valves 17aa, 17ab, ...; 17ba, 17bb ...
.. and the valve opening / closing control unit 27 for realizing the opening / closing combination.

The operation of the paper making dryer having the above structure will be described below.

The knowledge base 24 stores information obtained through the operator's many years of operation experience as a database in a simple IF-THEN rule format. As shown in FIG. 3, the paper making dryers 11a, 11b, 11c, Parameter information P from the vapor pressure sensors 19a, 19b, ...
I is classified by a, Pb, Pc, ...
It is stored in the F-THEN rule format.

Here, the condition part IF includes, for example, the following.

○ Comparison of process data and constants, ○ Comparison of process data with each other, ○ Comparison of two types of process data with comparison with constant, ○ Comparison of two types of process data with other process data Comparison with the size.

The process data is mainly the physical quantity detected from the sensor, but if it is defined in advance, it will be calculated between items such as the process data and the addition / subtraction result of the model parameter. It is also possible to use the result of.

The hypothesis section THEN commands the selection of a route for which regenerated steam is reused in which paper making dryer.

An example of this IF-THEN rule is as follows.

IF [(regenerated steam flow rate of the two-phase separator 14b> 2.
0) and (flow rate of steam flowing into the two-phase separator 14c> 3.0)] THEN [from the two-phase separator 14b to the paper dryer 11c
The path of inference by the optimum reuse path calculation unit 23 follows the flowchart shown in FIG.

This inference operation is repeatedly controlled to confirm that the energy efficiency is improved each time, and then the next control is performed. Therefore, the energy use efficiency is calculated before starting the inference. In this case, the total value of the amount of steam discharged outside the system without being reused can be used as an index.

When the nth calculation is performed, the first time (n-
The energy use efficiency for the route selection of 1) is obtained (step S1), and from the time before the last time (n-2) to the previous time (n-).
It is determined whether or not the energy use efficiency has been improved by the time of 1) (step S2).

If improvements are seen, IF-THEN rule,
The items having a higher degree of conformity to the current situation are rearranged in order (step S3).

In the operation of this step S3, various plant data are collected, the compatibility with the IF condition part of the rule is examined, and rearranged in descending order of compatibility. By doing so, the efficiency of energy use is increased by executing the THEN execution unit of the rule with a high degree of conformity, and the effect of energy saving is enhanced.

Then, select one with the highest priority (step S
4) If there is a candidate, it is judged whether or not the candidate route is already used (step S5).
S6) If the route is not used, this route is determined to be the optimum route (step S7), the validity of this route is examined, and a command is output to the valve opening / closing control unit 27 as the optimal route (step S8). .

In the step S2, when there is no improvement in the energy use efficiency of the previous time (n-1), the route with the highest energy use efficiency up to the (n-1) th time is reselected,
The valve opening / closing control unit 27 is instructed (step S9).

If the selected route is already used in step S6, this route is excluded, and the route having the second highest priority is selected (steps S6, S10, S).
4).

If a route candidate with a high priority is not found in step S5, the process stops and the route previously selected (n-1) is used as it is.

The route command selected in this way is the valve opening / closing control unit 27.
The valve opening / closing control unit 27 determines which opening / closing valve is to be opened and which opening / closing valve is to be closed based on the determined path, and each opening / closing valve 17a is determined by the determined result.
a, 17ab, ...; 17ba, 17bb, ...; 17c
The open / close control of a, 17cb, ... Is performed to establish a path that enables efficient reuse of the regenerated steam from each of the two-phase separators 14a, 14b, 14c ,.

[Advantages of the Invention] As described above, according to the present invention, it is possible to optimally reuse the regenerated steam according to the operating status of the plant of the papermaking machine, improve the efficiency of energy use, and realize energy saving. You can

[Brief description of drawings]

FIG. 1 is a circuit block diagram of one embodiment of the present invention, FIG. 2 is a system diagram of the above embodiment, FIG. 3 is an explanatory diagram showing the structure of a knowledge base IF-THEN rule of the above embodiment, and FIG. FIG. 5 is a flow chart for explaining the optimum reuse path calculation operation of the regenerated steam in the above embodiment, FIG. 5 is a configuration diagram of a general paper making dryer, and FIG. 6 is a system diagram of a conventional example. 11a, 11b, ...: Paper making dryer 12: Steam line 13a, 13b, ...: Exhaust steam 14a, 14b, ...: Two-phase separator 15a, 15b, ...: Regenerated steam 16a, 16b, ...: Regenerated steam line 17aa , 17ab, ..., 17dd: open / close valve

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Akira Yamaguchi, Aomori Prefecture, Hachinohe City, Oji, 3rd Aomori Valley, Aomori Yachi, Mitsubishi Paper Mills, Ltd. (72) Inventor, Hiroaki Kobayashi, Hachinohe City, Aomori, Aomori, 3rd place, Aomori Valley Mitsubishi Paper Mills, Ltd. Hachinohe Mill (72) Inventor Minoru Taniguchi, Aomori, Aomori, Aomori Prefecture, No. 3 Aomori Yachi No. 3 Mitsubishi Paper Mills, Hachinohe Mill (72) Hashimoto Nobuaki, Hachinohe, Aomori, Aomori Valley, Aomori Valley Address Mitsubishi Paper Mills, Ltd. Hachinohe Mill (56) References Japanese Patent Publication Sho 58-25955 (JP, B2) Japanese Patent Publication Sho 54-36336 (JP, B2)

Claims (1)

[Claims] 1. A steam line that guides a plurality of steams from a steam source to a paper making dryer provided side by side, a two-phase separating device installed at the steam outlet side of each paper making dryer, and a two-phase separating device. A regenerated steam line that guides the regenerated steam to each paper making dryer, an on-off valve that opens and closes the regenerated steam line that leads to each of the dryers, and the most suitable papermaking machine for reusing the regenerated steam from each two-phase separator. Reuse calculation control means for deducing a combination of dryers based on pre-stored knowledge rules, and a predetermined on-off valve for supplying regenerated steam to an arbitrary paper making dryer based on a command from the reuse calculation control means And a valve opening and closing control means for opening and closing the paper making machine.