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1. 发明专利

JPH04359786A CONTROL METHOD OF AIR SEPARATOR 失效
公开(公告)号：JPH04359786A
公开(公告)日：1992-12-14
申请号：JP13260291
申请日：1991-06-04
申请人： HITACHI LTD , HITACHI TECHNO ENG
发明人： SHIRACHI KENZOU , KAWATANI TADAHISA , TAHARA TOSHIYUKI , HASHIMOTO KENICHI , TASAKA YASUO
IPC分类号： F25J3/04
摘要： PURPOSE:To enhance the collection rate by installing a concentration controller for a specific component contained in a feed gas supplied to a coarse argon tower from the top of a main refining tower and controlling an outlet bypass valve based on its concentration in a low temperature air separator which collects argon. CONSTITUTION:Air in an air heat exchanger 1 exchanges heat with return gas from a main refining tower A. After it is cooled, it is blown into a lower tower 2 of the main refining tower A, where it is refined and separated into liquid nitrogen at the top and liquid air at the bottom. The liquid nitrogen and liquid air are supplied to an upper tower 3, but a part of the liquid air is supplied to a concentrator of a coarse Argon tower 4 where the feed gas from the upper tower 3 is liquefied. An expansion turbine 5 is driven by a part of the raw material air cooled by the air heat exchanger 1. The air from the expansion turbine 5 is blown into the upper tower 3 where it is refined and separated. A part of the air flows through an outlet bypass valve 7 and made to enter a waste nitrogen piping line from the upper tower 3. The outlet bypass valve 7 is automatically controlled according to the outlet of a concentration controller 9 which monitors the concentration of argon.

2. 发明专利

JPS63302281A METHOD OF CONTROLLING PURITY OF PRODUCT OF AIR SEPARATOR 失效
公开(公告)号：JPS63302281A
公开(公告)日：1988-12-09
申请号：JP13809287
申请日：1987-06-03
申请人： HITACHI LTD , HITACHI TECHNO ENG
发明人： TSUSHIMA HIROSHI , TASAKA YASUO , YAMAZAKI MASAHIRO
IPC分类号： F25J3/04

3. 发明专利

JPS63229120A CONTROL METHOD FOR PREPROCESSOR OF AIR SEPARATION PLANT 失效
公开(公告)号：JPS63229120A
公开(公告)日：1988-09-26
申请号：JP6099387
申请日：1987-03-18
申请人： HITACHI LTD , HITACHI TECHNO ENG
发明人： TASAKA YASUO , SASAKI KIYOSHI , SATONO TADASHI , YAMAZAKI MASAHIRO , TSUSHIMA HIROSHI
IPC分类号： B01D53/04 , F25J3/04 , F25J3/08
摘要： PURPOSE:To carry out a simple and highly reliable control by operating and outputting the opening degree of a pressure regulating valve by means of utilizing the time after starting the pressurizing process of an adsorption tower and the constant. CONSTITUTION:After the regenerating process, adsorption towers 6 and 7 enter into the pressurizing process, and are pressurized gradually by opening a pressure regulating valve 12. At that time, the opening degree of the pressurizing valve 12 is computed by utilizing the time after the pressurizing process is started and the constant, and the result of operation is transmitted to the pressure regulating valve 12 by means of a control device 16 to make the flow rate at the time of being pressurized constant. By said process, a simple and highly reliable control can be carried out without using a flow rate sensor and the like.

4. 发明专利

JPH07253271A PRODUCT PRESSURE CONTROLLING METHOD FOR HIGH COOLED SEPARATOR DEVICE 失效
公开(公告)号：JPH07253271A
公开(公告)日：1995-10-03
申请号：JP4681394
申请日：1994-03-17
申请人： HITACHI LTD , HITACHI TECHNO ENG
发明人： NAKAMURA HIROHIKO , TASAKA YASUO , TSUSHIMA HIROSHI , KAWAMURA YUTAKA
IPC分类号： F25J3/04
摘要： PURPOSE:To perform an automatic control of a product pressure of a high cooled separator device. CONSTITUTION:A pressure gauge 4 is installed at a product line, and a pressure adjusting meter 6 and a valve 3 are installed in a waste gas line. A set value of a waste gas pressure adjusting meter 6 is automatically set with a pressure of product. With such an arrangement as above, an automatic control for the product pressure of the high cooled separator device can become possible. A minimum raw material pressure can be attained for getting a product pressure.

5. 发明专利

JPH051881A CONTROL METHOD OF NITROGEN MANUFACTURING DEVICE 失效
公开(公告)号：JPH051881A
公开(公告)日：1993-01-08
申请号：JP15293291
申请日：1991-06-25
申请人： HITACHI LTD , HITACHI TECHNO ENG
发明人： KAWATANI TADAHISA , TASAKA YASUO , YANAGII TOSHIAKI , FURUYA MITSUHIRO , KOYAMA SHOJI
IPC分类号： F25J3/04
摘要： PURPOSE:To make the control operation of an operator unnecessary and an efficiently optimum operation by a method wherein the amount of liquid nitrogen, collected from the title device, is controlled by the opening degree of an automatic valve provided in a waste gas main tube or the flow rate of waste gas, flowing through the waste gas main tube. CONSTITUTION:When cold heat is excessive, the load of a turbine 7 is reduced by the operation of a liquid surface regulator 38 and the amount of waste gas is increased whereby the opening degree of an automatic valve is increased. On the contrary, when the cold heat is insufficient, the load of the turbine 7 is increased by the operation of the liquid surface regulator 38 and the amount of waste gas is reduced whereby the opening degree of the automatic valve is reduced. According to this method, the inlet pressure of the turbine is controlled in constant at all times. The opening degree of the bypass valve 15 of the turbine 7 is inputted into the opening degree regulator 36 to effect cascade control, in which the set value of a liquid nitrogen flow rate regulator 37 is changed by the output of the opening degree regulator 36. The output of the opening degree regulator 36 is set so as not to exceed the maximum collectable amount of liquid nitrogen whereby the amount of liquid nitrogen in accordance with the excessive degree of the generating amount of cold heat can be collected at all times.

6. 发明专利

JPH04139375A METHOD FOR OPERATING PRE-TREATMENT DEVICE FOR AIR-SEPARATOR 失效
公开(公告)号：JPH04139375A
公开(公告)日：1992-05-13
申请号：JP26058390
申请日：1990-10-01
申请人： HITACHI LTD , HITACHI TECHNO ENG
发明人： YANAGII TOSHIAKI , TASAKA YASUO , KAWATANI TADATAKA
IPC分类号： F25J3/04
摘要： PURPOSE:To enable a smooth energization of a device to be carried out by a method wherein a pressure removing valve of an adsorption column is opened when an energization is started and an amount of air more than a limited amount of reduction in a freezer is assured. CONSTITUTION:If a pre-treatment device for an air separator is being energized or the separator is being planned to be stopped and a degree of opening of an air releasing valve 14 is larger than its specified value, either a pressure releasing valve 12 or 13 of an adsorption column 6 or 7 being used is opened, a part of an air volume released from an air releasing valve 14 is released from the pressure reducing valve 12 or 13 so as to keep an amount of air. In addition, in case that the planned stopping is being carried out and a degree of opening of the air releasing valve 14 is more than its specified value or during the time in which the separator is ranged from its rectifying operation to its normal operation, either the pressure reducing valve 12 or 13 is opened only when the pressure is being decreased and it is not opened in other occasions. In this case, since the main body of the separator requires a rated amount of air, the rated amount of air can be assured and so it does not lower a limited amount of reduct of the freezer.

7. 发明专利

JPH0253179A RESTAURANT ORDER SYSTEM 失效
公开(公告)号：JPH0253179A
公开(公告)日：1990-02-22
申请号：JP20320088
申请日：1988-08-17
申请人： HITACHI LTD , HITACHI TECHNO ENG
发明人： ISHIZU HISAZUMI , TASAKA YASUO , KAWATANI TADANAO
IPC分类号： G07G1/12 , G06Q30/06 , G06Q50/00
摘要： PURPOSE:To speedily execute an order and to reduce the number of waitresses by observing a menu with a customer, inputting the order to a terminal equipment, simultaneously printing a receipt to the terminal equipment and displaying the contents of the order in a kitchen. CONSTITUTION:An order terminal equipment 1 is set in each table and the customer observes the menu and inputs the order. The ordered contents are printed to the order terminal equipment 1, processed by a processor 2 and displayed on a display device 3 which is set in the kitchen. The order terminal equipment 1 is composed of an input part 4, a display part 5 and a printer 6. The customer inputs the number of persons at the table and the order number of the menu and finally pushes the button of the sum. The ordered contents are displayed on the display part 5 and printed to the printer 6. Then, when the order is finished and the button of the sum is pushed, the receipt is completed by the printer 6. The customer takes the receipt to a register and executes payment.

8. 发明专利

JPH01296074A CONTROL OF SEPARATOR FOR VERY COLD LIQUEFIED GAS 失效
公开(公告)号：JPH01296074A
公开(公告)日：1989-11-29
申请号：JP12177188
申请日：1988-05-20
申请人： HITACHI LTD , HITACHI TECHNO ENG
发明人： TASAKA YASUO , YANAGII TOSHIAKI , KIBUNE KAZUTAKA , KAWATANI TADANAO
IPC分类号： F25J3/02 , F01K25/10 , F25J3/04
摘要： PURPOSE:To eliminate a delay in the response of a control system and make it easy to change the setting for the quantity of product liquid by adding to a primary buffer the quantity corresponding to the quantity of change at the time when a set value of the quantity of the product liquid is made and outputting gradually the quantity in the primary buffer for controlling the load of an expansion turbine. CONSTITUTION:An adder 15 for feed-forward is provided at an intermediate point in the signal from a liquid level adjustor 13 to a valve 4 at the inlet of an expansion turbine to carry out the calculation of the amount (MV) of feed-forward for the change of a set value from a flow rate control system and output the output value from the liquid level adjustor 13 with MV added. The product of the amount of change in the setting and a coefficient is added to the amount (FFB) of buffer of the feed-forward and it is outputted gradually until FFB becomes zero which was once stored. With this arrangement the feed-forward receives only the necessary amount and no sudden variation is affected to the expansion turbine.

9. 发明专利

JPS63229119A CONTROL METHOD FOR PREPROCESSOR OF AIR SEPARATION PLANT 失效
公开(公告)号：JPS63229119A
公开(公告)日：1988-09-26
申请号：JP6099187
申请日：1987-03-18
申请人： HITACHI LTD , HITACHI TECHNO ENG
发明人： TSUSHIMA HIROSHI , TASAKA YASUO , YAMAZAKI MASAHIRO
IPC分类号： B01D53/04 , F25J3/04 , F25J3/08
摘要： PURPOSE:To control variation of generated gas pressure by adding a feed forward signal to make a regenerated gas pressure regulating valve open at the time of completing the regenerating process of an adsorption tower and also adding a feed forward signal to make said valve close at the time of starting the regenerating process. CONSTITUTION:Changeover of the adsorption process and the regenerating process of adsorption towers 1 and 2 is carried out by opening and closing selector valves 3A, 3B and 4A, 4B and also a selector valve 5 for pressurizing by means of a signal issued from a changeover control device 7. Since regenerated gas is discharged out of a pressure regulating valve 6 while the selector valves 4A and 4B are closed, the variation of regenerated gas pressure can be minimized by adding a feed forward signal to make the pressure regulating valve 6 open at the time of the regenerating process of an adsorption tower and a feed forward signal to make the pressure regulating valve 6 close at the time of starting the regenerating process respectively to an output signal of the pressure regulating gage.

10. 发明专利

JPH05223A CONTROL OF FLOW RATE OF PURIFIED GAS OF TSA ADSORBING TOWER 失效
公开(公告)号：JPH05223A
公开(公告)日：1993-01-08
申请号：JP15293391
申请日：1991-06-25
申请人： HITACHI LTD , HITACHI TECHNO ENG
发明人： NAKAMURA HIROHIKO , TASAKA YASUO , TSUSHIMA HIROSHI
IPC分类号： B01D53/04
摘要： PURPOSE:To reduce the fluctuation of the flow rate on the downstream side of a TSA adsorbing tower and to make the flow rate and pressure of purified air constant by preliminarily increasing the inlet flow rate of the TSA adsorbing tower corresponding to the change-over time of the TSA adsorbing tower before the TSA adsorbing tower enters a pressurizing process. CONSTITUTION:The inlet guide blade 11 of an air compressor 12 is preliminarily operated by a control unit 12 a definite time before a TSA adsorbing tower 2 enters a pressurizing process at the time of the completion of a cooling process and the air compressor 1 is subjected to incremental operation. Next, the TSA adsorbing tower 2 enters the pressurizing process and a part of purified air is sent to the TSA adsorbing tower 2 through a pressure gas inlet change- over valve 10. Whereupon, the purified air is increased in quantity to be capable of being sent out in the same amount as the purified air before pressurization. By this constitution, the flow rate of the purified gas of the TSA adsorbing tower is always kept constant and the pressure of purified gas is kept almost constant to always perform stable operation.

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