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CN-224208645-U - Online cleaning system for steam turbine of geothermal power station

CN224208645UCN 224208645 UCN224208645 UCN 224208645UCN-224208645-U

Abstract

The utility model relates to the technical field of steam turbine cleaning equipment, in particular to an online cleaning system for a geothermal power station steam turbine, which comprises a condensate system, wherein the condensate system is connected with one end of an inlet pipeline, the other end of the inlet pipeline is connected with a cleaning water pump, the cleaning water pump is connected with one end of a first outlet pipeline, the other end of the first outlet pipeline is respectively connected with one end of a second outlet pipeline and one end of a recycling pipeline, a flowmeter and a needle-shaped regulating valve are arranged on the second outlet pipeline, the other end of the second outlet pipeline is connected with a plurality of cleaning branches, the tail end of each cleaning branch is provided with a nozzle, the nozzle is connected into a main steam pipeline, the main steam pipeline is connected with the geothermal power station steam turbine, and the other end of the recycling pipeline is connected with the condensate system. The condensed water is pressurized by the cleaning water pump, atomized by the nozzle and injected into the main steam pipeline, and the steam carries liquid drops to wash the nozzle and the blade of the steam turbine on line, so that the scale can be effectively removed in a non-stop state.

Inventors

  • LIU ZONGGEN
  • SUN HAITAO
  • WANG HONGGANG

Assignees

  • 青岛华丰伟业电力科技工程有限公司

Dates

Publication Date
20260508
Application Date
20250327

Claims (10)

  1. 1. The geothermal power station steam turbine online cleaning system comprises a condensate system (19), and is characterized in that the condensate system (19) is connected with one end of an inlet pipeline (1), the other end of the inlet pipeline (1) is connected with a cleaning water pump (4), the cleaning water pump (4) is connected with one end of a first outlet pipeline (22), and the other end of the first outlet pipeline (22) is respectively connected with one end of a second outlet pipeline (10) and one end of a recirculation pipeline (7); A flowmeter (11) and a needle-shaped regulating valve (12) are arranged on the second outlet pipeline (10), the other end of the second outlet pipeline (10) is connected with a plurality of cleaning branches, the tail end of each cleaning branch is provided with a nozzle (16), the nozzles (16) are connected into a main steam pipeline (17), and the main steam pipeline (17) is connected with a geothermal power station steam turbine (20); The other end of the recirculation pipeline (7) is connected with a condensate system (19).
  2. 2. The online cleaning system of the geothermal power station steam turbine according to claim 1 is characterized in that an inlet isolation valve (2) and a differential pressure transmitter (21) are sequentially arranged on an inlet pipeline (1) along the flowing direction of condensed water, the differential pressure transmitter (21) is connected with the inlet pipeline (1) in parallel through a connecting pipeline, and an inlet filter (3) is arranged on the inlet pipeline (1) connected with the differential pressure transmitter (21) in parallel.
  3. 3. An on-line cleaning system for steam turbines of geothermal power plants as claimed in claim 2, characterized in that the inlet filter (3) is connected to a sewage drain, on which a filter sewage drain valve (18) is arranged, the end of which is led into the sewage drain.
  4. 4. An on-line cleaning system for geothermal power station steam turbines according to claim 1, characterized in that a first pressure gauge (23) is arranged on the inlet pipe (1) close to the cleaning water pump (4), a second pressure gauge (24) is arranged on the first outlet pipe (22) close to the cleaning water pump (4), and a third pressure gauge (25) is arranged on the second outlet pipe (10).
  5. 5. An on-line cleaning system for geothermal power plant steam turbines according to claim 1, characterized in that the outlet non-return valve (5) and the outlet isolation valve (6) are arranged in sequence on the first outlet pipe (22) in the flow direction of the condensate.
  6. 6. An on-line cleaning system for steam turbines of geothermal power plants as claimed in claim 1, characterized in that the second outlet pipe (10) is connected to the inlet of an electrically operated isolation valve (13), the outlet of the electrically operated isolation valve (13) being connected to the cleaning branch.
  7. 7. An on-line geothermal power plant steam turbine cleaning system according to claim 1, characterized in that a manual isolation valve (15) is provided in the cleaning branch.
  8. 8. An on-line geothermal power plant steam turbine cleaning system according to claim 7, characterized in that a bleed valve (14) is arranged between manual isolation valves (15) of different cleaning branches.
  9. 9. An on-line cleaning system for steam turbines of geothermal power plants as claimed in claim 1, characterized in that the number of cleaning branches is two, the end of each cleaning branch is connected with two nozzles (16), and the two nozzles (16) of the same cleaning branch are arranged at diametrically opposite positions of the main steam pipe (17).
  10. 10. An on-line cleaning system for geothermal power plant steam turbines according to claim 1, characterized in that the recirculation pipe (7) is provided with a recirculation isolation valve (8) and an orifice plate (9).

Description

Online cleaning system for steam turbine of geothermal power station Technical Field The utility model relates to the technical field of steam turbine cleaning equipment, in particular to an online cleaning system for a geothermal power station steam turbine. Background The turbine is used as a rotary steam power device, is core equipment for converting heat energy into mechanical energy, and is used for jetting high-pressure steam to blades through nozzles to drive a rotor spindle to rotate so as to realize power output. In the field of geothermal power generation, geothermal power station turbines play a key role in converting geothermal fluid thermal energy into electrical energy. The hot steam has complex components, contains a large amount of Ca, mg, fe, siO 2, na, K and other components and H 2 S and other non-condensable gases, and the substances are easily accumulated on the nozzle and the blades to form scale in the long-term operation of the geothermal power station turbine, so that the scale not only can cause the reduction of the output power and the efficiency of the geothermal power station turbine, but also can corrode the nozzle and the blades, even can influence the abnormal vibration of the unit, and seriously threatens the safe and stable operation of the unit. In first-line work, it was found that when the blockage rate at the first stage nozzle of a geothermal power plant steam turbine gradually increased to about 10% -15%, the efficiency and safe operation of the steam turbine were affected. Currently, geothermal turbine cleaning mainly relies on shutdown operations, including three types of techniques, mechanical scraping, chemical soaking and high pressure water jet. The mechanical cleaning needs to disassemble the cylinder, the risk of damaging the precise blade profile exists, the chemical cleaning can dissolve part of scale, but strong acid and strong alkali are easy to accelerate metal corrosion, the dissolution efficiency of high-concentration silicate in geothermal steam is less than 60%, residual chemical liquid can pollute a geothermal recharging system, and the high-pressure water jet technology is easy to cause coating stripping due to improper impact force control and still needs to be stopped for implementation. The existing geothermal power station steam turbine cleaning method depends on shutdown cleaning, so that power generation loss and operation and maintenance cost are increased greatly. Geothermal power plants will face millions of power losses, estimated at a single shut down for 48 hours. In addition, off-line cleaning cannot remove dynamic scale in real time, so that the unit is in an efficiency attenuation state for a long time. More seriously, H 2 S in geothermal steam is electrochemically active with the ferrous sulfide scale layer generated by Fe 2+ at high temperature, and conventional chemical cleaning may exacerbate the corrosion process. Although the gas turbine art has attempted on-line water washing techniques, geothermal turbines have not yet developed a mature on-line washing scheme due to differences in dielectric properties. Disclosure of utility model Aiming at the technical problems that the nozzle and the blade of the geothermal power station turbine are fouled due to mineral impurities carried by geothermal steam and the traditional shutdown cleaning loss is serious, the utility model provides an online cleaning system for the geothermal power station turbine. And the cleaning strength is accurately controlled through the flowmeter and the needle-type regulating valve, so that the blade profile is prevented from being damaged by excessive scouring. The utility model provides an online cleaning system of a geothermal power station steam turbine, which comprises a condensate system, wherein the condensate system is connected with one end of an inlet pipeline, the other end of the inlet pipeline is connected with a cleaning water pump, the cleaning water pump is connected with one end of a first outlet pipeline, and the other end of the first outlet pipeline is respectively connected with one end of a second outlet pipeline and one end of a recirculation pipeline; The second outlet pipeline is provided with a flowmeter and a needle-shaped regulating valve, the other end of the second outlet pipeline is connected with a plurality of cleaning branches, the tail end of each cleaning branch is provided with a nozzle, the nozzles are connected into a main steam pipeline, and the main steam pipeline is connected with a geothermal power station steam turbine; the other end of the recirculation pipeline is connected with a condensate system. Further, an inlet isolation valve and a differential pressure transmitter are sequentially arranged on an inlet pipeline along the flowing direction of the condensate water, the differential pressure transmitter is connected with the inlet pipeline in parallel through a connecting pipeline, and an inlet filter is arr