In one embodiment, a system is provided. The system includes a combustor configured to combust a fuel, and a three-way valve fluidly coupled the combustor and disposed upstream of the combustor. The system also includes a fuel circuit comprising a fuel supply, wherein the fuel circuit is disposed up
In one embodiment, a system is provided. The system includes a combustor configured to combust a fuel, and a three-way valve fluidly coupled the combustor and disposed upstream of the combustor. The system also includes a fuel circuit comprising a fuel supply, wherein the fuel circuit is disposed upstream of the three-way valve and is configured to provide the fuel to the three-way valve. The system additionally includes a fuel conduit section fluidly coupling the fuel circuit to the combustor. The system further includes an inert fluid supply configured to provide an inert fluid to the three-way valve and a compressor discharge (CPD) fluid source configured to provide a purge fluid to the three-way valve. The three-way valve is configured to purge the fuel from a first portion of the fuel conduit section by using the purge fluid.
대표청구항▼
1. A system, comprising: a turbine system comprising:a combustor configured to combust a fuel;a switching circuit fluidly coupled to the combustor and disposed upstream of the combustor;a fuel circuit comprising a fuel supply, wherein the fuel circuit is disposed upstream of the switching circuit an
1. A system, comprising: a turbine system comprising:a combustor configured to combust a fuel;a switching circuit fluidly coupled to the combustor and disposed upstream of the combustor;a fuel circuit comprising a fuel supply, wherein the fuel circuit is disposed upstream of the switching circuit and is configured to provide the fuel to the switching circuit;a fuel conduit section fluidly coupling the fuel circuit to the combustor;an inert fluid supply configured to provide an inert fluid to the switching circuit;a compressor discharge (CPD) fluid source configured to provide a purge fluid to the switching circuit, wherein the switching circuit is configured to purge the fuel from a first portion of the fuel conduit section by using the purge fluid, and wherein the first portion includes a length of between 5 ft and 50 ft; anda control system configured to control the switching circuit to maintain a purge condition by:(1) shutting down the turbine system via a normal shutdown;(2) introducing air or inert fluid to create and maintain a pressurized pipe section; and(3) continuously monitor a liquid fuel block and a drain valve position so that if continuous monitoring is lost or the liquid fuel block or the drain valve deviates from an assigned position, the purge credit is lost and the subsequent start of the turbine system use a purge operation prior to a light-off; and(4) continuously monitor a pressure in a double block and a drain pipe sections, and if the continuous monitoring is lost or a pressure downstream of a middle block valve decreases to less than approximately 3 PSID above an upstream pressure, purge credit is lost and the subsequent start of the turbine system use a purge operation prior to light-off. 2. The system of claim 1, wherein the switching circuit comprises a three-way valve, a tee having two check valves, a tee having two 2-way valves, a multiport valve having 6 to 18 lines, or a combination thereof. 3. The system of claim 2, wherein the purge of the first portion of the fuel conduit section complies with a purge credit as described in a National Fire Protection Association (NFPA) document 85 (NFPA 85), boiler and combustion systems hazards code edition 2011. 4. The system of claim 1, comprising a turbine compartment configured to enclose the turbine system having the combustor, and wherein the first portion of the fuel conduit section comprises a piping section diposed outside of the turbine compartment. 5. The system of claim 4, wherein the turbine compartment comprises a width of between 5 ft. to 50 ft, a length of between 5 ft and 50 ft, and a height of between 5 ft and 50 ft. 6. The system of claim 1, wherein the switching circuit is controlled by the controller to maintain a second portion of the fuel conduit section substantially full of the fuel while purging the fuel from the first portion of the fuel conduit section. 7. The system of claim 1, wherein the fuel comprises a diesel, a syngas, or a combination thereof. 8. The system of claim 1, wherein the inert fluid comprises a nitrogen. 9. The system of claim 1, wherein the purge fluid comprises a compressed air. 10. The system of claim 9, wherein the compressed air comprises a pressure of at least 14.7 PSI in order to eliminate backflow. 11. The system of claim 1, wherein the purge of the first portion of the fuel conduit section complies with a purge credit as described in a National Fire Protection Association (NFPA) document 85 (NFPA 85), boiler and combustion systems hazards code edition 2011. 12. A turbine system, comprising: a turbine fluidly coupled to a combustor configured to combust a fuel;a multi-way valve having a first inlet, a second inlet, and an outlet, wherein the outlet is fluidly coupled to the combustor;a compressor discharge (CPD) fluid source configured to provide a CPD purge fluid to the multi-way valve through a first circuit fluidly coupled to the first inlet and through a second circuit fluidly coupled to the second inlet, wherein the multi-way valve is configured to switch between the first and the second inlets to purge the fuel from the turbine by using the CPD purge fluid; anda control system configured to maintain a purge condition by:(1) shutting down the turbine system via a normal shutdown;(2) introducing air or inert fluid to create and maintain a pressurized pipe section; and(3) continuously monitor a liquid fuel block and a drain valve position so that if continuous monitoring is lost or the liquid fuel block or the drain valve deviates from an assigned position, the purge credit is lost and the subsequent start of the turbine system use a purge operation prior to a light-off; and(4) continuously monitor a pressure in a double block and a drain pipe sections, and if the continuous monitoring is lost or a pressure downstream of a middle block valve decreases to less than approximately 3 PSID above an upstream pressure, purge credit is lost and the subsequent start of the turbine system use a purge operation prior to light-off. 13. The system of claim 12, comprising the first circuit, wherein the first circuit is fluidly coupled to a fuel delivery circuit configured to provide the fuel from a fuel supply, and wherein the first circuit is configured to be maintained substantially full of the fuel during the purge. 14. The system of claim 13, comprising a second circuit having a liquid fuel purge manifold disposed between the multi-way valve and the CPD fluid source, and the multi-way valve is configured to direct the CPD purge fluid into the combustor through the second circuit to purge the fuel from the turbine. 15. The system of claim 12, wherein the first circuit is fluidly coupled to a fuel delivery circuit configured to provide the fuel from a fuel supply, and wherein the first circuit is configured to be maintained substantially empty of the fuel during the purge. 16. The system of claim 15, wherein the first circuit extends beyond a width, a length, and a height of a turbine compartment having the turbine. 17. The system of claim 15, comprising a 14 to 1 manifold disposed between the multi-way valve and the CPD fluid source, wherein the multi-way valve is configured to direct the CPD purge fluid into the 14 to 1 manifold to purge the fuel from the first circuit and from the turbine. 18. The system of claim 12, wherein at least one circuit fluidly coupled to or comprising the multi-way valve complies with a purge credit as described in a National Fire Protection Association (NFPA) document 85 (NFPA 85), boiler and combustion systems hazards code edition 2011. 19. A system comprising: a three-way valve having a first inlet, a second inlet, and an outlet, wherein the outlet is configured to fluidly couple to a turbine system;a fuel circuit fluidly coupled to the first inlet, wherein the fuel circuit is configured to provide a fuel to the turbine system; a purge circuit fluidly coupled to the second inlet, wherein the purge circuit is configured to purge the turbine system of the fuel, and wherein the three-way valve is configured to switch between the first and the second inlets to purge the fuel from the turbine system; and a control system configured to maintain a purge condition by:(1) shutting down turbine system via a normal shutdown;(2) introducing air or inert fluid to create and maintain a pressurized pipe section; and(3) continuously monitor a liquid fuel block and a drain valve position so that if continuous monitoring is lost or the liquid fuel block or the drain valve deviates from an assigned position, the purge credit is lost and the subsequent start of the turbine system use a purge operation prior to a light-off; and(4) continuously monitor a pressure in a double block and a drain pipe sections, and if the continuous monitoring is lost or a pressure downstream of a middle block valve decreases to less than approximately 3 PSID above an upstream pressure, purge credit is lost and the subsequent start of the turbine system use a purge operation prior to light-off. 20. The system of claim 19, wherein the three-way valve is configured to open the first inlet and close the second inlet to enable a flow of purge fluid through the fuel circuit, substantially removing the fuel from the fuel circuit and from the turbine system. 21. The system of claim 19, wherein the three-way valve is configured to open the second inlet and close the first inlet to enable a flow of purge fluid through the purge circuit, substantially removing the fuel from the turbine system while the fuel circuit is maintained substantially full of the fuel. 22. The system of 19, wherein the purge circuit complies with a purge credit as described in a National Fire Protection Association (NFPA) document 85 (NFPA 85), boiler and combustion systems hazards code edition 2011.
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이 특허에 인용된 특허 (9)
Mina Theodors I. (Lincoln GBX), Dual fuel injector with purge and premix.
Robert Scott Traver ; Robert Joseph Iasillo ; Howard Jay Kaplan ; Troy Joseph Schroeder ; Christopher John Morawski, Liquid fuel and water injection purge systems and method for a gas turbine having a three-way purge valve.
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