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1. 发明专利

JP2001082105A INCREMENTAL SPEED VARIATION CONTROL METHOD AND DEVICE FOR STEAM TURBINE 失效
公开(公告)号：JP2001082105A
公开(公告)日：2001-03-27
申请号：JP26322299
申请日：1999-09-17
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： OMORI TAKASHI , NISHINOMIYA TAKUJI , KANEDA HIDEAKI
IPC分类号： F01D17/20
摘要： PROBLEM TO BE SOLVED: To enlarge a governor free operation area by adding each correction circuit and improve a load following property, further free a gradient settle ratio by correcting a real machine incremental speed variation, improve an governing valve body (hard part) by a correction circuit (soft) even without minute adjust and confirm the load follow property of a plant by an eyesight by CRT indication system. SOLUTION: On the way of the outputting of CV opening order signal 3 sent from a turbine control device 16, by adding a control system correction circuit 5 consisting of the circuits 6, 8, 10 for correcting a real machine operation characteristic (main steam pressure, temperature) and the intrinsic value of a turbine control system (governing valve flow rate characteristic, incremental speed variation), an ideal CV opening characteristic 1 and CV passing flow rate are obtained and the incremental speed variation is stabilized and the load following property is improved.

2. 发明专利

JPS6365104A CONTROL METHOD FOR REHEAT STEAM TURBINE 失效
公开(公告)号：JPS6365104A
公开(公告)日：1988-03-23
申请号：JP20787886
申请日：1986-09-05
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： KANEDA HIDEAKI , FURUKAWA KAZU
IPC分类号： F01K7/24
摘要： PURPOSE:To prevent steam from residing in a reheater or a wheel chamber of a steam turbine by opening valves by turns from the lower steam side to the upper stream side, and closing the valves by turns, in the contrary from the upper stream side to the lower stream side. CONSTITUTION:In case of opening valves, a valve opening degree command signal increases from 0% toward 100%. Accordingly, the valves open from the lower stream side such as from the second intercept valve 12 to a steam governor valve 8. On the other hand, in case of closing, since the valve opening degree command signal decreases from 100% toward 0%, in the contrary the valves close from the upper stream side such as from the steam governor valve 8, the first intercept valve 10, to the second intercept valve 12 in the order contrary to that of the opening case. Accordingly, the main steam, the first reheat steam and the second reheat steam do not reside in a steam turbine in either case and residing can be prevented, and overheat deformation of a wheel chamber caused by a burning loss or a wind loss of a reheater can be certainly prevented.

3. 发明专利

JPS61207805A WARMING OF REDUCING VALVE OF STEAM TURBINE AND APPARATUS THEREOF 失效
公开(公告)号：JPS61207805A
公开(公告)日：1986-09-16
申请号：JP4749085
申请日：1985-03-12
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： NISHINOMIYA TAKUJI , KANEDA HIDEAKI , MAEDA TAKAYOSHI , KUWAJIMA HIDESUMI
IPC分类号： F01D25/10
摘要： PURPOSE:To shorten the starting time by shortening the warming time for a reducing valve by automatically controlling the opening degree and the opening and closing timing of the warming valve of a steam reducing valve according to the temperature distribution state of a turbine. CONSTITUTION:In order to warm the steam reducing valve 3 of a turbine 4, a warming valve 5 installed onto a main steam stop valve 2 is controlled by a warming-valve opening-degree adjustor 6. A mode discriminating device 7 receives each temperature signal of the first high-pressure stage inner-wall temperature detector 8, reducing-value inner-wall temperature detector 10 and a reducing-valve outer-wall temperature detector 11 in the high pressure turbine 4, and selects the pattern of a previously set opening degree and the opening and closing timing according to the above-described temperature, and sends the valve control signals into the opening-degree adjustor 6 according to said pattern. Therefore, the warming valve 5 can be controlled according to the turbine temperature distribution state, and warming can be performed in the shortest time, suppressing the thermal stress of the reducing valve 3.

4. 发明专利

JPH11183268A THERMOCOUPLE 失效
公开(公告)号：JPH11183268A
公开(公告)日：1999-07-09
申请号：JP35665097
申请日：1997-12-25
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： KUROSAWA ATSUHIRO , KANEDA HIDEAKI , NAKAMURA TOKUJI , NAGAI SHINICHI
IPC分类号： G01K1/08 , G01K1/14 , G01K13/02
摘要： PROBLEM TO BE SOLVED: To obtain a thermocouple whose life can be made long by making the gap between a damping piece in a protecting tube and a radiation shield pipe small as far as possible to be at a prescribed value or lower and attaching a tip guide to the tip part of the radiation shield pipe. SOLUTION: A thermocouple is composed of a 4 of a Nimblocks thermocouple 5, a damping piece 6, a sway lock 7, a radiation shield pipe 13, and the like. The gap between the damping piece 6 and the radiation shield pipe 13 is made to be a size of a prescribed value or lower. In order to insert the thermocouple protecting tube 4, a structure in which a tip guide is attached to the tip part of the radiation shield pipe 13 is formed, and the gap between the thermocouple protective pipe 4 and the damping piece 6 can be reduced. Thereby, a vibration due to a fluid to be temperature-measured can be reduced between the thermocouple protecting tube 4 and the radiation shield pipe 13, and their damage and wear can be reduced. As a result, it is possible to obtain the thermocouple whose yield strength is high.

5. 发明专利

JPH07189609A CONTROL METHOD FOR MOISTURE CONTENT SEPARATION HEATER 失效
公开(公告)号：JPH07189609A
公开(公告)日：1995-07-28
申请号：JP33492993
申请日：1993-12-28
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： IGARASHI KINGO , AKITA AKIRA , KANEDA HIDEAKI , NISHINOMIYA TAKUJI
IPC分类号： F01K7/24
摘要： PURPOSE:To realize an operation method for a moisture content separation heater in which occurrence of turbine vibration is prevented so that non reheated operation for the moisture content separation heater is carried out when the malfunction of the moisture content separation heater or plant occurrs, and the plant operation is continued without causing any trouble to the moisture content separation heater and a steam turbine in the steam turbine having the moisture content separation heater. CONSTITUTION:A moisture content separation heater to prevent occurrence of turbine vibration is non reheatedly operated by outputting a non-reheat operation start command for the moisture content separation heater, and gradually lowering heating steam of the moisture content separation heater by means of a by-pass valve 12 of a heating steam control valve 11, the heating steam control valve 11 or a heating steam stop valve 10 in a controller 16. By such a process, the occurrence of steam turbine vibration is prevented so that the moisture content separation heater can be nonreheatedly operated.

6. 发明专利

JPH0610614A TURBINE LUBRICATING OIL NATURE REGULATING DEVICE 失效
公开(公告)号：JPH0610614A
公开(公告)日：1994-01-18
申请号：JP16573992
申请日：1992-06-24
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： YOSHIHARA NORIO , KANEDA HIDEAKI
IPC分类号： F01D25/18 , F16N29/04 , F16N39/06
摘要： PURPOSE:To reduce accident potential so as to monitor the differential pressure of a filter precisely by providing a level switch on the sedimentation chamber in the dry type oil cleaner in a steam turbine lubricating oil system so as to detect the amount of moisture, and announcing an alarm by an inter lock at the time of moisture abnormal condition so as to correspond to the accident. CONSTITUTION:In the lubricating oil system of a turbine, oil from an oil tank is led into an oil cleaner through a piping 10, and oil passes the water separating net 8 in a sedimentation chamber 7 in an arrow (a) direction so as to have water condensed and deposited. Moisture condensed in water drops is absorbed in a water layer provided below, and the amount 6 of moisture is detected by a level switch 1 provided in a water cylinder type container 5. When the level switch 1 is turned on by an inter lock, a filter pump is operated, and a drain valve 2 is opened by using a timer, and the valve 2 is closed thereafter. An alarm is announced when the level switch 1 is not turned off while taking the case into account where much amount of moisture flows into a system. It is thus possible to reduce accident potential so as to monitor differential pressure of a filter precisely.

7. 发明专利

JPH0281905A FORCED COOLING METHOD FOR STEAM TURBINE AND COOLING DEVICE FOR THE SAME 失效
公开(公告)号：JPH0281905A
公开(公告)日：1990-03-22
申请号：JP23229488
申请日：1988-09-19
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： NAGAI SHINICHI , TAKETOMO MASAKI , KANEDA HIDEAKI , SAKAMOTO AKIHISA
IPC分类号： F01D5/08 , F01D25/12 , F01D25/26 , F01K13/02
摘要： PURPOSE:To improve the cooling efficiency of a high pressure casing and enable shortening of the cooling period by sending a cooling air to a high pressure turbine between the inner casing, and the rotor and outer casing under controlling the flow rate and temperature. CONSTITUTION:The cooling air from an air pump 8 is subjected to temperature regulation in a heater 10 and introduced in a high pressure turbine exhaust pipe by a connecting pipe 19. One of the branched cooling air is passed between an inner casing 1 and a rotor 5 and released to the atmosphere from a main steam stop valve drain pipe 11a through a steam governing valve 11. On the other hand, the cooling air passed through the space a, b rooms between the inner casing 1 and the outer casing 2 is run through a cooling air passing port 2a provided on the outer casing 2 and released to the atmosphere through a cooling air low rate control valve 21. Hence, the high pressure turbine is cooled efficiency from the both inner and outer sides of the inner case 1, and the cooling period can be shortened.

8. 发明专利

JPH1061408A OPERATION METHOD OF TURBINE IN INDIVIDUAL OPERATION 失效
公开(公告)号：JPH1061408A
公开(公告)日：1998-03-03
申请号：JP23987996
申请日：1996-08-22
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： SATO OSAMU , IKEDA HIROSHI , KANEDA HIDEAKI , KONDO SATOSHI
IPC分类号： F01D17/24 , F01K7/22 , F01K7/24
摘要： PROBLEM TO BE SOLVED: To suppress excessive reduction of frequency (number of revolution) generated at the time of individual operation and make the individual operation in a system a success. SOLUTION: In repeat cycle thermal power generation facility which consists of a high pressure turbine having a high pressure turbine bypass line and a low pressure turbine bypass line, and an intermediate and low pressure turbine at the time of individual operation when a power system linked with this power generation facility is shut off and load of a generator is reduced, reheat steam pressure 14 is set temporarily in such a manner that it is kept at pressure 14 before the generation of individual operation by an analog switch 20 which is operated by an individual operation generation signal 39 in a system. A deviation between actual repeat steam pressure 16 and it is obtained based on the set pressure, proportional integration operation 18 is done to adjust a degree of opening of a low pressure turbine bypass valve 8, and output of the intermediate and low pressure turbine is controlled in such a manner that it is higher than output at the time of normal high and intermediate pressure operation.

9. 发明专利

JPH09105682A THERMOCOUPLE FOR MEASURING FLUID 失效
公开(公告)号：JPH09105682A
公开(公告)日：1997-04-22
申请号：JP26386895
申请日：1995-10-12
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： NAKAMURA TOKUJI , KANEDA HIDEAKI , NAGAI SHINICHI , YAMAGUCHI KOJI , AMANO HAJIME
IPC分类号： G01K1/08 , F02C7/00 , F02D35/00 , G01K13/02
摘要： PROBLEM TO BE SOLVED: To provide a thermocouple having such performance as a high strength and high response. SOLUTION: In the thermocouple in which a temperature measuring unit for measuring temperature is brought into direct contact with a fluid to be temperature-measured having random flow and which is required to have a high speed and high response to the temperature change of the fluid to be temperature-measured, a protective tube 4 for protecting a sheath 3 has a shape gradually thicker from the tip end to make it possible to perform high response and to reduce the stress generated by the fluid to be temperature-measured. The outer diameter of the tube at the tip end of the thermocouple is made thin, and the shape is so formed as to be gradually thicker by smooth shape change to make it possible to provide the thermocouple having performances of a high strength and high response contrary to each other.

10. 发明专利

JPS63248903A PROTECTING METHOD FOR STEAM TURBINE 失效
公开(公告)号：JPS63248903A
公开(公告)日：1988-10-17
申请号：JP8094787
申请日：1987-04-03
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： KANEDA HIDEAKI , FURUKAWA KAZU
IPC分类号： F01K7/24 , F01D21/12 , F01D21/16
摘要： PURPOSE:To surely protect steam turbines, by detecting temperature of reheat steam, in a reheat electric power plant formed with a reheat system, and stopping the steam turbines when the detected value becomes under the specified value. CONSTITUTION:Main steam heated in a boiler 1 flows in a high pressure turbine 4 through a main steam stop valve 2 and a steam control valve 3. Steam which has worked in the high pressure turbine 4, returns to the boiler 1 and is reheated here, and after that, flows in a middle pressure turbine 7 through a reheat steam stop valve 5 and an intercept valve 6. Moreover, steam which has worked in the middle pressure turbine 7, flows in a low pressure turbine 9 through a crossover pipe 8, and after that, is condensed in a condenser 10. By this constitution equipment, steam temperature detectors 13, 14 are set in the main steam system and the reheat steam system, respectively. Then, the steam turbine is stopped when temperature of the reheat steam becomes less than the specified value.

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