CA1130097A - Power plant and method of operation - Google Patents
Power plant and method of operationInfo
- Publication number
- CA1130097A CA1130097A CA318,115A CA318115A CA1130097A CA 1130097 A CA1130097 A CA 1130097A CA 318115 A CA318115 A CA 318115A CA 1130097 A CA1130097 A CA 1130097A
- Authority
- CA
- Canada
- Prior art keywords
- gas
- expansion engine
- pressure section
- control element
- line
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
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- Control Of Eletrric Generators (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
The present invention provides a method for automatic control of a power plant including an electric generator and an expansion engine having a high-pressure section, a take-off chamber and a low-pressure section and coupled to the electric generator's shaft, in which method a control signal of the electric load of the electric generator is applied to a first control element which controls the flow rate of gas supplied from a gas line to the high-pressure section of the expansion engine, which controls the amount of gas discharged from the take-off chamber of the expansion engine to a gas main; a control signal of the pressure downstream of the expansion engine is applied to a second control element which controls the flow rate of a part of the gas flow supplied through the low-pressure section of the expansion engine to a controlled counterpressure gas line; the control signal of the pressure downstream of the expansion engine is applied to a third control element which controls the flow rate of the rest of the gas flow, which third control element is installed in a line that bypasses the expansion engine, whereby the rest of the gas flow is directed to the controlled counterpressure gas .
line. The invention also provides an apparatus for use in the method.
The present invention provides a method for automatic control of a power plant including an electric generator and an expansion engine having a high-pressure section, a take-off chamber and a low-pressure section and coupled to the electric generator's shaft, in which method a control signal of the electric load of the electric generator is applied to a first control element which controls the flow rate of gas supplied from a gas line to the high-pressure section of the expansion engine, which controls the amount of gas discharged from the take-off chamber of the expansion engine to a gas main; a control signal of the pressure downstream of the expansion engine is applied to a second control element which controls the flow rate of a part of the gas flow supplied through the low-pressure section of the expansion engine to a controlled counterpressure gas line; the control signal of the pressure downstream of the expansion engine is applied to a third control element which controls the flow rate of the rest of the gas flow, which third control element is installed in a line that bypasses the expansion engine, whereby the rest of the gas flow is directed to the controlled counterpressure gas .
line. The invention also provides an apparatus for use in the method.
Description
113~0~17 TI~E O~ ~XE INVEN~ION
~IE~HO~ ~OR AU~O~ATIC CON~ROL OF PO~R PLAN~ AND
POWER PLAN~ OF COMPRESSOR STATION OF GAS PIPE~INE
SYS~EM, WHEREIN SAID METHOD IS EF~CTED
~ he present invention relates to heat-power engi~eer-ing and, more particularly~ to a method for automatic cont-rol o~ a power plant and to a power plant o~ a compressor station o~ a gas pipeline system, in which said method is ef~ected. ~he invention is applicable to power supply sy-stems of gas compressor stations operating under variable conditions.
BACKGROUND OE ~H~ INVE~ION
There is widely known a method of ~ontrolling a power plant (a steam turbine) with a controlled bleed and counter-pressure. According to this method, electrical energy is produced by a gas flow one part of which is partially dis-charged from the controlled bleed chamber, whereas the other part is directed from the power plant to the controlled co-unterpressure header. According to the mebhod under review~
a control ~ignal to control the pressure downstream o~ the power plant (in the controlled counterpressure header) is applied to a control element which controls the ~low rate o~ gas supplied to the high-pressure section o~ the power plant. ~he signal to control the pressure in the controlled .. . , . ................... - - -.. "
~130097
~IE~HO~ ~OR AU~O~ATIC CON~ROL OF PO~R PLAN~ AND
POWER PLAN~ OF COMPRESSOR STATION OF GAS PIPE~INE
SYS~EM, WHEREIN SAID METHOD IS EF~CTED
~ he present invention relates to heat-power engi~eer-ing and, more particularly~ to a method for automatic cont-rol o~ a power plant and to a power plant o~ a compressor station o~ a gas pipeline system, in which said method is ef~ected. ~he invention is applicable to power supply sy-stems of gas compressor stations operating under variable conditions.
BACKGROUND OE ~H~ INVE~ION
There is widely known a method of ~ontrolling a power plant (a steam turbine) with a controlled bleed and counter-pressure. According to this method, electrical energy is produced by a gas flow one part of which is partially dis-charged from the controlled bleed chamber, whereas the other part is directed from the power plant to the controlled co-unterpressure header. According to the mebhod under review~
a control ~ignal to control the pressure downstream o~ the power plant (in the controlled counterpressure header) is applied to a control element which controls the ~low rate o~ gas supplied to the high-pressure section o~ the power plant. ~he signal to control the pressure in the controlled .. . , . ................... - - -.. "
~130097
-2-- :
bleed chamber is also applied to said control element for controlling the flow rate of gas directed to the high-pres-sure section of the power plant.
~ he control signal to control the pressure downstream of the power plant is also applied to another control ele-ment to control the flow rate of gas directed to the low-pressure section of the power plant. The control signal of the electric load of the electric generator, i.e. a pulse carrying information on the rotation speed of the power plant's rotor, is applied to the control element which cont-rols the ~low rate of gas supplied to the high-pressure sec-tion of the power plant in order to raise the rotation speed of the power plantls rotor~
~ he method under review does not make it possible to automatically control a power plant operating under condi-tions when there are independent programs according to which power is produced and gas is supplied at a predetermined pressure to the heat engines which power the gas compressors.
There is widely known a power plant of a compressor station of a gas main with gas pumping units including gas compressors and oombustion ohambers of ga5 turbine instal-lations. ~he power plant under review comprises an electric generator having a power take-off chamber and intended to meet the power requirements of the compressor station, and ` ' ', ' . ' . ' ' ` .:
... ' :
i~ 3~ ~ ~7 an expansion engine whose shaft is coupled to that of said electric generator. ~he inlet of the expansion engine is con~
nected through a heater and a control eleme~t, installed at the inlet o~ said expansion engine, to the gas main. '~he outlet of the expansion engine is connected to the combus-tiOIl chambers of the gas ~urbine installations which power the gas compressors.
Similar power plants are provided with a line includ-ing a control member and bypassing -the foregoing units.
However, t~e above power plant only meets the power requirements of the compressor station depe~ding on the amo-un-t of gas supplied to the heat engines which power the gas compressors.
In case of a limitation in or a complete stop of the fuel gas supply due to an emergency situation at the compres-sor sta-tion, the foregoing power plant either limits or com-pletely stops the production of electrical energy. In such situations, the use of other types of power producing equip-ment to meet the power requirements of the compressor sta-tion in~olves serious difficultiss and considerably affects the operating reliability o~ the compressor station. ~or that reason, none of the existing autonomous compressor sta-tions incorporates a power plant of the foregoing type des-pite its obvious thermodynamic effectiveness.
.
, .,.
, , il3()0~7 BRIEF D~SCRIPTION O~ I~IE INVEN~IOM
It is an object of the present invention to provide a method which would make it possible to automatically cont-rol a power plant opera-ting under conditions when electrical energy is produced independently of the supply of gas to the heat engines which power -the gas compressors.
~ he foregoing object is attained by providing a method .
~or automa-tic control o~ a power plant, according to which a control signal of the electric load o~ the electric gene-rator is applied to a first control element to control the -~~low rate of gas supplied ~rom the pipeline to the high-pressure section of an e~pansion engine, whereas a control signal o~ the pressure downstream of the expansion engine is applied to a second control element to control the flow rate o~ the part of the gas flow which is supplied through the low-pressure section of the expansion engine to a cont-rolled coun-terpressure line~ which method is characterized, according to the invention, by that the control signal o~
the electric load of the electric generator is applied to the first con-trol element to control the flow rate o~ gas !
~: supplied from the gas pipeline to the high-pressure seotion o~ the e~pansion engine in order to control the amount of gas . discharged ~rom the take o~f chamber o~ the expansion engine to the gas line, whereas the con-trol signal of the pressure ,.. .
, : .
. ~
1~3~0g7 downstream o~ -the expansion engine is additionally applied to a third con-trol elemen-t to control the ~low rate o~ the res-t o~ the gas ~low, which is installed in a line that by-passes the low-pressure section o~ the expansion engine in order to direct the rest o~ -the gas flow to the controlled coun-ter,pressure line.
~ he object o~ the present invention is ~urther attained by providing a power plant of a compressor station o~ a gas pipeline system with gas mai~s and gas pumpin~ units includ-ing gas compressors and combustion chambers of gas -turbine installations, comprising an electric generator having a take o~f chamber and intended to meet the power requirements of the compressor station, an eæpansion engine whose sha~t is coupled to that o~ said electric generator and whose inlet is connected through a heater and a gas ~low ra-te control element to the gas main, whereas its outlet is connected to the combustion chambers of the gas turbine installations, and a gas flow rate control element installed at the inlet of the eæpan~ion engine, as well as a second control element ar-ranged at the inlet of the low-pressure section o~ said ex-pansion engine, which power plant is charaot~rized, accord-ing to the invention, by that it includes a third control element installed in a line which bypasses the low-pressure section o~ the expansion engine, a check valve installed at the outlet of the take-o~ chamber o~ the expansion engine, -, ~ , . . ~
- .: . ... :.. , . :
1~00~7 and a cooler o~ gas discharged ~rom the take-of~ chamber of the expansion engine, which is arranged between the check valve and the gas line.
BRIEF DESCRIP~IO~ OE THE A~ACHED DR~WI~G
Other obaects and advantages o~ the present invention will ba more readily understood ~rom the following detailed des~ription o~ a pre~erred embodiment thereof to be read in conjunction with the accompanying drawing which is a sche-matic diagram of a power plant, wherein the proposed method of controlling a power plant is realized.
DE~AI~ED DESCRIP~IO~ O~ THE INV~N~ION
The proposed method for automatic control of a power plant i~ as follows. A control signal of the electric load of an electric generator 1 is applied to a first gas ~1QW
rate control element 2. Gas is supplied from a pipeline 3 to a high-pressure section 4 of an e~pansion engine 5. This makes it possible to control the amount of gas discharged from a take-o~ chamber 6 of the e~pansion engine 5 through a gas line 7 to a gas main 8. A oontrol si~nal o~ the pres_ sure downstream of the e~pansion 0ngine 5 ~in a controlled counterpressure gas line 9) is applied to a second control element 10 intended to control the flow rate of the first part of the gas flow. ~he ~irst Part o~ the gas flow is di-' ':' ;' i, . . ..
-~
, . : , . . : ~ : ,, . ; .
., 3V0~7 rected through a low-pressure section 11 o~ the expansion e~gine 5 to the controlled counterpressure line 9. Simulta-neously, the control signal o~ the pressure downstream of the expansion engine 5 (in the controlled coun-terpressure gas line 9) is applied to a third control element 12 to cont-rol the ~low rate of the rest o~ the gas. ~he control ele-me~t 12 i9 installed in a line 13 which bypasses the e~pan-sion engine 5, whereby the rest of the gas ~low is directed to the controlled counterpressure gas line 9.
The proposed power plan-t of a compres~or sta-tion o~
a gas pipeline system with the gas ~ains 8 and gas pumping units 14 including gas compressors 15 and combustion chambers 16 of gas turbine installations 17 comprises the electric generator 1 ~hose sha~t is coupled to that of the epansion engine 5. ~he e~pansion engine 5 has a high-pressure section 4, the take-o~ chamber 6 and the low-pressure section 11.
~he inlet o~ the high-pressure section 4 o~ the expansion engine 5 is the inlet o~ said expansion engine 5. It is con-nected to the gas line 8 through a heater 18 and the cont-rol eleme~t 2 intended to control the flow rate of ~aq sup-plied to the expansion engi~e 5. ~he control element 2 is hydraulicallg connec-ted to an electric load transducer 19 o~ the electric generator 1. Due to said hydraulic connec-tion, the control signal to control the rotation speed of ",. ~ f, - . ' . , ' ` ' ' . ., ,:
, : . ,, ' ~300~7 the shaft (not shown) of the expansion engine 5 is applied to the control element 2 and the high-pressure section 4 of said expansion engine 5. q`he take-off chamber 6 of the expan-sion engine 5 is connected through a check valve 20 and a gas cooler 21 to -the inlet of the compressor 15 mounted on the same shaft with the gas turbine installation 17. ~he outlet of the high-pressure section 4 o~ the expansion en-gine 5 is connected to the inlet o~ the low-pressure sac-tion 11 of said expansion engine 5 through the control ele-ment 10 to control the flow rate of the first part of the gas flow, supplied to the low-pressure section 11 of said expansion engine 5. ~he outlet of the low-pressure section 11 of the expansion engine 5 is the outlet of said e~pansion engine 5 and is connecbed through the oontrolled counter-pressure gas line 9 to the combustion chamber 16 of the gas turbine installa-tion 17. The controlled counterpressure ga9 line 9 is also connected through the gas line 13, which bypasses the low-pressure section 11 of the expansion en-gine 5, to the gas line 7. In the gas line 13, which bypasses the low-pressure section 11 of the e~pansion engine 5, there is installed the control element 12 whioh direct.s the resb of the gas flow to the controlled counterpressure gas line 9. The control elements 10 and 12, which control the flow rate of gas directed to the controlled counterpressure gas line 9, are hydraulically connected to a pick-up 22 of pres-..-. . .. . - ,, ,- - ~ ~, .. - :
.
' ' ' . ,~ . . ~
.~
1~3(~0~7 _9_ sure in said gas line 9. Due to said hydrauli~ connection between the pick-up 22 and the control elements 10 and 12, the control signal of the pressure in the gas line 9 is applied to 9aid co~trol elements 10 and 12.
~ he operating principle o~ the proposed power plant o~ a compressor station o~ a gas pipeline system operating under variable conditions is as ~ollows.
At a low flow rate of ~uel gas and with a high ~l~ct-ric load of the power consuming equipment, when the pressure o~ the ~uel gas passing through the e~pansion engine 5 is insuf~icient to meet the power requirements, the oontrol element 2 i9 opened by a control signal arriving ~rom the electric load transducer 19 of the electric generator 1.
A9 a result, a greater amount of fuel gas i9 supplied ~rom the gas li~e 3 to the high-pressure section 4 o~ the e~pan-sion engine 5 than is neoessary to burn in the combustion chambers 16 of the heat engines 17 which power the gas com-pressors 15. Downstream o~ the high-pressure section 4 o~
the e~pansion engine 5, the excessive amount o~ ~uel gas is directed through the check valve 20 and the gas line 7 to the gas main 8. The necessary amount o~ gas i5 passed through the low-pressure section 11 o~ the e~pansion engine 5 to the controlled counter~pressure line 9 with the aid of the control element 10 by the control signal which arrives ~rom the pick-up 22 dependi~g on the pressure o~ gas in the line . ~ , ~ ' ' '. ~.
'. ' ' , ' '' ' ' ' ", ' ' ~ , .~' ', .
, ~ ' ' , li3~ 7 9. The control signal of the pick-up 22 keeps the control element 12 open, which control element 12 is installed in the gas :Line 13 that bypasses the low-pressure section 11 of the expansion engine 5.
As the electric load of the power consuming units is re-duced and as the fuel gas flow rate is increased so that the pressure of the fuel gas passed through the expansion engine 5 is greater than is necessary to meet the power requirements, there takes place the following sequence of events. The control element 2 is closed by the control signal arriving from the electric load transducer 19 of the electric genera-tor 1. Upstream of the check valve 20, the pressure is reduced so that said check valve 20 is closed. As this takes place, the control element 10 is fully opened by the control signal of the pick-up 22 produced due to a reduced gas pres-sure in the controlled counterpressure gas line 9. The amount of fuel gas passed to the controlled counterpressure gas line 9 through the low-pressure section 11 of the expansion engine 5 is limited by the control element 2; as a result, the pressure in the controlled counterpressure gas line 9 goes down. The control signal of the pick-up 22 opens the control element 12 so that the necessary additional amount of fuel gas is supplied through the gas line 13, which bypasses the low-pressure section 11 of the expansion engine 5, to . . :
: .
:
1~300~7 the controlled counterpressure gas line 9. ~hus the proposed power plant proves to be highly reliable and versatile in producing a required amount of power and maintaining a pre-de-termined flow rate of fuel gas, which substantially im-proves the operating conditions of the compressor station.
. , , ~ ~ .
.
.
:
: ~ :
: ~ .
'' .. . , , ., . ~. , : . .,. . . .. ... : , .. :- .
. ~, . : - ,: -,, .-, .-~, . . .
..
bleed chamber is also applied to said control element for controlling the flow rate of gas directed to the high-pres-sure section of the power plant.
~ he control signal to control the pressure downstream of the power plant is also applied to another control ele-ment to control the flow rate of gas directed to the low-pressure section of the power plant. The control signal of the electric load of the electric generator, i.e. a pulse carrying information on the rotation speed of the power plant's rotor, is applied to the control element which cont-rols the ~low rate of gas supplied to the high-pressure sec-tion of the power plant in order to raise the rotation speed of the power plantls rotor~
~ he method under review does not make it possible to automatically control a power plant operating under condi-tions when there are independent programs according to which power is produced and gas is supplied at a predetermined pressure to the heat engines which power the gas compressors.
There is widely known a power plant of a compressor station of a gas main with gas pumping units including gas compressors and oombustion ohambers of ga5 turbine instal-lations. ~he power plant under review comprises an electric generator having a power take-off chamber and intended to meet the power requirements of the compressor station, and ` ' ', ' . ' . ' ' ` .:
... ' :
i~ 3~ ~ ~7 an expansion engine whose shaft is coupled to that of said electric generator. ~he inlet of the expansion engine is con~
nected through a heater and a control eleme~t, installed at the inlet o~ said expansion engine, to the gas main. '~he outlet of the expansion engine is connected to the combus-tiOIl chambers of the gas ~urbine installations which power the gas compressors.
Similar power plants are provided with a line includ-ing a control member and bypassing -the foregoing units.
However, t~e above power plant only meets the power requirements of the compressor station depe~ding on the amo-un-t of gas supplied to the heat engines which power the gas compressors.
In case of a limitation in or a complete stop of the fuel gas supply due to an emergency situation at the compres-sor sta-tion, the foregoing power plant either limits or com-pletely stops the production of electrical energy. In such situations, the use of other types of power producing equip-ment to meet the power requirements of the compressor sta-tion in~olves serious difficultiss and considerably affects the operating reliability o~ the compressor station. ~or that reason, none of the existing autonomous compressor sta-tions incorporates a power plant of the foregoing type des-pite its obvious thermodynamic effectiveness.
.
, .,.
, , il3()0~7 BRIEF D~SCRIPTION O~ I~IE INVEN~IOM
It is an object of the present invention to provide a method which would make it possible to automatically cont-rol a power plant opera-ting under conditions when electrical energy is produced independently of the supply of gas to the heat engines which power -the gas compressors.
~ he foregoing object is attained by providing a method .
~or automa-tic control o~ a power plant, according to which a control signal of the electric load o~ the electric gene-rator is applied to a first control element to control the -~~low rate of gas supplied ~rom the pipeline to the high-pressure section of an e~pansion engine, whereas a control signal o~ the pressure downstream of the expansion engine is applied to a second control element to control the flow rate o~ the part of the gas flow which is supplied through the low-pressure section of the expansion engine to a cont-rolled coun-terpressure line~ which method is characterized, according to the invention, by that the control signal o~
the electric load of the electric generator is applied to the first con-trol element to control the flow rate o~ gas !
~: supplied from the gas pipeline to the high-pressure seotion o~ the e~pansion engine in order to control the amount of gas . discharged ~rom the take o~f chamber o~ the expansion engine to the gas line, whereas the con-trol signal of the pressure ,.. .
, : .
. ~
1~3~0g7 downstream o~ -the expansion engine is additionally applied to a third con-trol elemen-t to control the ~low rate o~ the res-t o~ the gas ~low, which is installed in a line that by-passes the low-pressure section o~ the expansion engine in order to direct the rest o~ -the gas flow to the controlled coun-ter,pressure line.
~ he object o~ the present invention is ~urther attained by providing a power plant of a compressor station o~ a gas pipeline system with gas mai~s and gas pumpin~ units includ-ing gas compressors and combustion chambers of gas -turbine installations, comprising an electric generator having a take o~f chamber and intended to meet the power requirements of the compressor station, an eæpansion engine whose sha~t is coupled to that o~ said electric generator and whose inlet is connected through a heater and a gas ~low ra-te control element to the gas main, whereas its outlet is connected to the combustion chambers of the gas turbine installations, and a gas flow rate control element installed at the inlet of the eæpan~ion engine, as well as a second control element ar-ranged at the inlet of the low-pressure section o~ said ex-pansion engine, which power plant is charaot~rized, accord-ing to the invention, by that it includes a third control element installed in a line which bypasses the low-pressure section o~ the expansion engine, a check valve installed at the outlet of the take-o~ chamber o~ the expansion engine, -, ~ , . . ~
- .: . ... :.. , . :
1~00~7 and a cooler o~ gas discharged ~rom the take-of~ chamber of the expansion engine, which is arranged between the check valve and the gas line.
BRIEF DESCRIP~IO~ OE THE A~ACHED DR~WI~G
Other obaects and advantages o~ the present invention will ba more readily understood ~rom the following detailed des~ription o~ a pre~erred embodiment thereof to be read in conjunction with the accompanying drawing which is a sche-matic diagram of a power plant, wherein the proposed method of controlling a power plant is realized.
DE~AI~ED DESCRIP~IO~ O~ THE INV~N~ION
The proposed method for automatic control of a power plant i~ as follows. A control signal of the electric load of an electric generator 1 is applied to a first gas ~1QW
rate control element 2. Gas is supplied from a pipeline 3 to a high-pressure section 4 of an e~pansion engine 5. This makes it possible to control the amount of gas discharged from a take-o~ chamber 6 of the e~pansion engine 5 through a gas line 7 to a gas main 8. A oontrol si~nal o~ the pres_ sure downstream of the e~pansion 0ngine 5 ~in a controlled counterpressure gas line 9) is applied to a second control element 10 intended to control the flow rate of the first part of the gas flow. ~he ~irst Part o~ the gas flow is di-' ':' ;' i, . . ..
-~
, . : , . . : ~ : ,, . ; .
., 3V0~7 rected through a low-pressure section 11 o~ the expansion e~gine 5 to the controlled counterpressure line 9. Simulta-neously, the control signal o~ the pressure downstream of the expansion engine 5 (in the controlled coun-terpressure gas line 9) is applied to a third control element 12 to cont-rol the ~low rate of the rest o~ the gas. ~he control ele-me~t 12 i9 installed in a line 13 which bypasses the e~pan-sion engine 5, whereby the rest of the gas ~low is directed to the controlled counterpressure gas line 9.
The proposed power plan-t of a compres~or sta-tion o~
a gas pipeline system with the gas ~ains 8 and gas pumping units 14 including gas compressors 15 and combustion chambers 16 of gas turbine installations 17 comprises the electric generator 1 ~hose sha~t is coupled to that of the epansion engine 5. ~he e~pansion engine 5 has a high-pressure section 4, the take-o~ chamber 6 and the low-pressure section 11.
~he inlet o~ the high-pressure section 4 o~ the expansion engine 5 is the inlet o~ said expansion engine 5. It is con-nected to the gas line 8 through a heater 18 and the cont-rol eleme~t 2 intended to control the flow rate of ~aq sup-plied to the expansion engi~e 5. ~he control element 2 is hydraulicallg connec-ted to an electric load transducer 19 o~ the electric generator 1. Due to said hydraulic connec-tion, the control signal to control the rotation speed of ",. ~ f, - . ' . , ' ` ' ' . ., ,:
, : . ,, ' ~300~7 the shaft (not shown) of the expansion engine 5 is applied to the control element 2 and the high-pressure section 4 of said expansion engine 5. q`he take-off chamber 6 of the expan-sion engine 5 is connected through a check valve 20 and a gas cooler 21 to -the inlet of the compressor 15 mounted on the same shaft with the gas turbine installation 17. ~he outlet of the high-pressure section 4 o~ the expansion en-gine 5 is connected to the inlet o~ the low-pressure sac-tion 11 of said expansion engine 5 through the control ele-ment 10 to control the flow rate of the first part of the gas flow, supplied to the low-pressure section 11 of said expansion engine 5. ~he outlet of the low-pressure section 11 of the expansion engine 5 is the outlet of said e~pansion engine 5 and is connecbed through the oontrolled counter-pressure gas line 9 to the combustion chamber 16 of the gas turbine installa-tion 17. The controlled counterpressure ga9 line 9 is also connected through the gas line 13, which bypasses the low-pressure section 11 of the expansion en-gine 5, to the gas line 7. In the gas line 13, which bypasses the low-pressure section 11 of the e~pansion engine 5, there is installed the control element 12 whioh direct.s the resb of the gas flow to the controlled counterpressure gas line 9. The control elements 10 and 12, which control the flow rate of gas directed to the controlled counterpressure gas line 9, are hydraulically connected to a pick-up 22 of pres-..-. . .. . - ,, ,- - ~ ~, .. - :
.
' ' ' . ,~ . . ~
.~
1~3(~0~7 _9_ sure in said gas line 9. Due to said hydrauli~ connection between the pick-up 22 and the control elements 10 and 12, the control signal of the pressure in the gas line 9 is applied to 9aid co~trol elements 10 and 12.
~ he operating principle o~ the proposed power plant o~ a compressor station o~ a gas pipeline system operating under variable conditions is as ~ollows.
At a low flow rate of ~uel gas and with a high ~l~ct-ric load of the power consuming equipment, when the pressure o~ the ~uel gas passing through the e~pansion engine 5 is insuf~icient to meet the power requirements, the oontrol element 2 i9 opened by a control signal arriving ~rom the electric load transducer 19 of the electric generator 1.
A9 a result, a greater amount of fuel gas i9 supplied ~rom the gas li~e 3 to the high-pressure section 4 o~ the e~pan-sion engine 5 than is neoessary to burn in the combustion chambers 16 of the heat engines 17 which power the gas com-pressors 15. Downstream o~ the high-pressure section 4 o~
the e~pansion engine 5, the excessive amount o~ ~uel gas is directed through the check valve 20 and the gas line 7 to the gas main 8. The necessary amount o~ gas i5 passed through the low-pressure section 11 o~ the e~pansion engine 5 to the controlled counter~pressure line 9 with the aid of the control element 10 by the control signal which arrives ~rom the pick-up 22 dependi~g on the pressure o~ gas in the line . ~ , ~ ' ' '. ~.
'. ' ' , ' '' ' ' ' ", ' ' ~ , .~' ', .
, ~ ' ' , li3~ 7 9. The control signal of the pick-up 22 keeps the control element 12 open, which control element 12 is installed in the gas :Line 13 that bypasses the low-pressure section 11 of the expansion engine 5.
As the electric load of the power consuming units is re-duced and as the fuel gas flow rate is increased so that the pressure of the fuel gas passed through the expansion engine 5 is greater than is necessary to meet the power requirements, there takes place the following sequence of events. The control element 2 is closed by the control signal arriving from the electric load transducer 19 of the electric genera-tor 1. Upstream of the check valve 20, the pressure is reduced so that said check valve 20 is closed. As this takes place, the control element 10 is fully opened by the control signal of the pick-up 22 produced due to a reduced gas pres-sure in the controlled counterpressure gas line 9. The amount of fuel gas passed to the controlled counterpressure gas line 9 through the low-pressure section 11 of the expansion engine 5 is limited by the control element 2; as a result, the pressure in the controlled counterpressure gas line 9 goes down. The control signal of the pick-up 22 opens the control element 12 so that the necessary additional amount of fuel gas is supplied through the gas line 13, which bypasses the low-pressure section 11 of the expansion engine 5, to . . :
: .
:
1~300~7 the controlled counterpressure gas line 9. ~hus the proposed power plant proves to be highly reliable and versatile in producing a required amount of power and maintaining a pre-de-termined flow rate of fuel gas, which substantially im-proves the operating conditions of the compressor station.
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'' .. . , , ., . ~. , : . .,. . . .. ... : , .. :- .
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Claims (2)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A method for automatic control of a power plant including an electric generator and an expansion engine having a high-pressure section, a take-off chamber and a low-pressure section and coupled to the electric generator's shaft, in which method a control signal of the electric load of the electric generator is applied to a first control element which controls the flow rate of gas supplied from a gas line to the high-pressure section of the expansion engine,/which controls the amount of gas discharged from the take-off chamber of the expansion engine to a gas main;/a control signal of the pressure downstream of the expansion engine is applied to a second control element which controls the flow rate of a part of the gas flow supplied through the low-pressure section of the expansion engine to a controlled counterpressure gas line; the control signal of the pressure downstream of the expansion engine is applied to a third control element which controls the flow rate of the rest of the gas flow, which third control element is installed in a line that bypasses the expansion engine, whereby the rest of the gas flow is directed to the controlled counterpressure gas line.
2. A power plant of a compressor station of a gas pipe-line system with gas mains and gas pumping units including gas compressors and combustion chambers of gas turbine in-stallations, which power plant comprises:
an electric generator intended to meet the power re-quirements of the compressor station;
an expansion engine whose shaft is coupled to that of said electric generator; a high-pressure section of said expansion engine, having an inlet, which is the inlet of said expansion engine, and an outlet; a take-off chamber of said expansion engine, having an inlet matched with the out-let of said high-pressure section, and an outlet; a low-pres-sure section of said expansion engine, having an inlet and an outlet which is the outlet of said expansion engine;
a first gas flow rate control element installed at the inlet of said high-pressure section of said expansion engine;
a check valve installed at the outlet of said take-off chamber of said expansion engine;
a second control element installed at the inlet of said low-pressure section of said expansion engine;
a heater of gas supplied to said expansion engine;
a line bypassing said low-pressure section of said expansion engine;
a third control element installed in said bypassing line;
a cooler of gas discharged from said take-off chamber of said expansion engine;
the inlet of the high-pressure section of said expan-sion engine being connected through said heater and said first control element to the gas main, where-as the outlet of the take-off chamber of said expansion en-gine is connected through the check valve and the cooler to another portion of the gas line, the outlet of the low-pres-sure section of said expansion engine being connected to said combustion chambers of said gas turbine installations.
an electric generator intended to meet the power re-quirements of the compressor station;
an expansion engine whose shaft is coupled to that of said electric generator; a high-pressure section of said expansion engine, having an inlet, which is the inlet of said expansion engine, and an outlet; a take-off chamber of said expansion engine, having an inlet matched with the out-let of said high-pressure section, and an outlet; a low-pres-sure section of said expansion engine, having an inlet and an outlet which is the outlet of said expansion engine;
a first gas flow rate control element installed at the inlet of said high-pressure section of said expansion engine;
a check valve installed at the outlet of said take-off chamber of said expansion engine;
a second control element installed at the inlet of said low-pressure section of said expansion engine;
a heater of gas supplied to said expansion engine;
a line bypassing said low-pressure section of said expansion engine;
a third control element installed in said bypassing line;
a cooler of gas discharged from said take-off chamber of said expansion engine;
the inlet of the high-pressure section of said expan-sion engine being connected through said heater and said first control element to the gas main, where-as the outlet of the take-off chamber of said expansion en-gine is connected through the check valve and the cooler to another portion of the gas line, the outlet of the low-pres-sure section of said expansion engine being connected to said combustion chambers of said gas turbine installations.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA318,115A CA1130097A (en) | 1978-12-18 | 1978-12-18 | Power plant and method of operation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA318,115A CA1130097A (en) | 1978-12-18 | 1978-12-18 | Power plant and method of operation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1130097A true CA1130097A (en) | 1982-08-24 |
Family
ID=4113156
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA318,115A Expired CA1130097A (en) | 1978-12-18 | 1978-12-18 | Power plant and method of operation |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1130097A (en) |
-
1978
- 1978-12-18 CA CA318,115A patent/CA1130097A/en not_active Expired
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| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |