초록 ▼

Various embodiments include systems for controlling the flow of main steam from a high-pressure (HP) turbine to a turbine packing. In some cases, a system is disclosed including: a high pressure (HP) turbine including a plurality of stages, the plurality of stages including an early stage, a middle

Various embodiments include systems for controlling the flow of main steam from a high-pressure (HP) turbine to a turbine packing. In some cases, a system is disclosed including: a high pressure (HP) turbine including a plurality of stages, the plurality of stages including an early stage, a middle stage and a later stage; an intermediate pressure (IP) turbine operably connected with the HP turbine; a packing separating the HP turbine and the IP turbine; a main conduit fluidly connecting the middle stage of the HP turbine and the packing, the main conduit including a main valve; and a bypass conduit fluidly connected to the main conduit and bypassing the main valve, the bypass conduit including: a blocking valve; and an opening between the blocking valve and a downstream connection with the main conduit.

대표청구항 ▼

1. A system comprising: a high pressure (HP) steam turbine including a plurality of stages, the plurality of stages including an early stage, a middle stage and a later stage;an intermediate pressure (IP) steam turbine operably connected with the HP steam turbine;a packing separating the HP steam tu

1. A system comprising: a high pressure (HP) steam turbine including a plurality of stages, the plurality of stages including an early stage, a middle stage and a later stage;an intermediate pressure (IP) steam turbine operably connected with the HP steam turbine;a packing separating the HP steam turbine and the IP steam turbine;a main conduit fluidly connecting the middle stage of the HP steam turbine and the packing, the main conduit including a main valve; anda bypass conduit fluidly connected to the main conduit and bypassing the main valve, the bypass conduit including: a blocking valve; andan opening between the blocking valve and a downstream connection with the main conduit. 2. The system of claim 1, further comprising a control system operably connected with the main valve and the blocking valve. 3. The system of claim 2, the control system configured to perform the following: monitor an operating parameter of the HP steam turbine; andadjust a position of at least one of the main valve or the blocking valve in response to the operating parameter deviating from a predetermined range. 4. The system of claim 3, wherein the operating parameter is an operating load of the HP steam turbine. 5. The system of claim 4, wherein the control system is configured to close the main valve and open the bypass valve in response to determining the operating load of the HP steam turbine exceeds a predetermined threshold. 6. The system of claim 4, wherein the control system is configured to close both of the main valve and the bypass valve in response to determining a malfunction has occurred. 7. The system of claim 1, wherein the main valve includes a ball valve, and wherein the main valve is devoid of a cross-drilled hole. 8. The system of claim 1, wherein the opening includes an orifice plate and an orifice, wherein the opening meters steam flow during operation of the HP steam turbine and the IP steam turbine at base load. 9. The system of claim 1, wherein the bypass conduit has an inner diameter approximately 10-20 percent smaller than an inner diameter of the main conduit, such that a lesser fluid flow rate is permitted through the bypass conduit than the main conduit. 10. The system of claim 1, wherein the HP steam turbine and the IP steam turbine are connected along a common shaft. 11. A system comprising: a high pressure (HP) steam turbine;a packing separating the HP steam turbine from an IP steam turbine;a main conduit fluidly connecting a middle stage of the HP steam turbine and the packing, the main conduit including a main valve, wherein the main valve is devoid of a cross-drilled hole; anda bypass conduit fluidly connected to the main conduit and bypassing the main valve, the bypass conduit including: a blocking valve; andan opening between the blocking valve and a downstream connection with the main conduit. 12. The system of claim 11, wherein the main valve includes a ball valve. 13. The system of claim 12, wherein the opening includes an orifice plate and an orifice, wherein the opening meters fluid flow during operation of the HP steam turbine and the IP steam turbine at base load. 14. The system of claim 11, wherein the bypass conduit has an inner diameter approximately 10-20 percent smaller than an inner diameter of the main conduit, such that a lesser fluid flow rate is permitted through the bypass conduit than the main conduit. 15. A system comprising: at least one computing device configured to monitor a reheat steam bypass system by performing actions including: determining an operating parameter of a high-pressure (HP) steam turbine fluidly connected with a packing; andadjusting a position of at least one of a reheat rotor cooling valve (RHCV) or a cooling steam blocking valve (CSBV) to modify a flow of main steam in the reheat steam bypass system in response to the operating parameter of the HP steam turbine deviating from a predetermined range,wherein the RHCV and the CSBV are connected in parallel in the reheat steam bypass system. 16. The system of claim 15, wherein the operating parameter is an operating load of the HP steam turbine. 17. The system of claim 16, wherein the at least one computing device is further configured to close the RHCV and open the CSBV in response to determining the operating load of the HP steam turbine deviates from the predetermined range. 18. The system of claim 16, wherein the at least one computing device is further configured to close both of the RHCV and the CSBV in response to determining a malfunction has occurred in the HP steam turbine.