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Method and device for cleaning steam turbine blades at low temperature

A steam turbine blade and low temperature technology, which is applied in the field of steam turbines, can solve problems such as incomplete cleaning, economic loss of the company, and increased technical difficulty, so as to achieve the effect of improving economic benefits of production and avoiding economic losses

Inactive Publication Date: 2015-10-28
ANHUI WANBEI COAL REFCO GRP LTD HANSHAN HENGTAI NONMETALLIC MATERIALS BRANCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] For the cleaning of steam turbine blades in the traditional process, most of them choose to remove them after the unit stops, and then use high-pressure water guns to clean them. The disadvantages are: 1. Due to the parking conditions, it not only wastes a lot of time It will bring economic losses to the company; 2. Since the rotor with blades needs to be disassembled and cleaned, it undoubtedly increases the technical difficulty when disassembling and assembling the rotor, and it is prone to rework
3. It is difficult to choose the high and low pressure of the high-pressure water gun during the cleaning process. If the water pressure is low, the cleaning will not be thorough; if the water pressure is high, the blade will be damaged to a certain extent.

Method used

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  • Method and device for cleaning steam turbine blades at low temperature

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] A method for cleaning steam turbine blades at low temperature, comprising the following steps:

[0040] (1) get the salt scale on the outer wall of the condenser tube and analyze, after according to the composition of salt scale, the hydrochloric acid mass concentration of preparation cleaning salt scale is 3%;

[0041] (2) Put the hydrochloric acid in (1) into the dosing tank, pressurize it through the diaphragm pump to make the pressure 5.0MPa, and then mix it with the soft water produced by the thermoelectric water storage device; there is a pressure adjustment device behind the diaphragm pump A meter and a flowmeter for controlling the liquid flow; a deluge valve for pressure relief is provided behind the thermoelectric water storage device;

[0042] (3) Pass the mixture in (2) into the nozzle to form mist droplets;

[0043] (4) The steam generated by the steam engine is cooled to 220°C by the cooler, and then flows through the nozzle, so that the mist droplets in ...

Embodiment 2

[0047] A method for cleaning steam turbine blades at low temperature, comprising the following steps:

[0048] (1) get the salt scale on the outer wall of the condenser tube and analyze, after according to the composition of salt scale, the hydrochloric acid mass concentration of preparation cleaning salt scale is 5%;

[0049] (2) Put (1) Chinese medicinal water into the dosing tank, pressurize it through the diaphragm pump to make the pressure 10MPa, and then mix it with the soft water produced by the thermoelectric water storage device; the diaphragm pump is equipped with a pressure gauge to adjust its pressure and a flow meter for controlling the liquid flow; a deluge valve for pressure relief is provided behind the thermoelectric water storage device;

[0050] (3) Pass the mixture in (2) into the nozzle to form mist droplets;

[0051] (4) The steam generated by the steam engine is cooled to 250°C by the cooler, and then flows through the nozzle, so that the mist droplets in...

Embodiment 3

[0055] Such as figure 1 As shown, the device for cleaning steam turbine blades at low temperature includes a steam engine 9 and a condenser 16 connected to the exhaust port of the steam turbine 15. The steam engine 9 communicates with the nozzle 12 through the cooler 10, and the inlet ends of the nozzle 12 are respectively connected to the nozzles for providing The thermoelectric water storage device 8 for the soft water of the boiler is connected to the outlet end of the diaphragm pump for pressurizing the desalination and scale medicine contained in the dosing tank 1 .

[0056] Further, the outlet end of the dosing tank 1 is provided with two parallel first diaphragm pumps 2-1 and the second diaphragm pump 2-2, the inlet and outlet of the first diaphragm pump 2-1 and the second diaphragm pump 2-2 Each is provided with a first stop valve 3-1; the outlet end of the dosing tank 1 is also provided with a first drain valve 7-1; the outlet port of the first diaphragm pump 2-1 and ...

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Abstract

The invention provides a method for cleaning a turbine blade at a low temperature. The method comprises the steps of preparing a cleaning liquid agent, adding the cleaning liquid agent into a dosing slot, pressurizing the cleaning liquid agent with a diaphragm pump and mixing with soft water generated by a thermal electric water storing device; introducing into a spray nozzle to form mist-like liquid drops, distributing in steam, fully mixing with a mixer, cleaning the salt dirty of the turbine blade and recycling and cooling steam. The invention also provides a cleaning device, which comprises a steam engine and a steam condenser connected to the steam discharging port of a turbine; the steam engine is communicated with the spray nozzle by a cooler; the inlet end of the spray nozzle is respectively connected with the thermal electric water storing device and the diaphragm pump for pressurizing the cleaning liquid agent in the dosing slot; the outlet end of the spray nozzle is connected with the inlet end of the turbine by the mixer. The targeted cleaning liquid agent is prepared according to the components of the salt dirty and the turbine blade is cleaned by mixing the cleaning liquid agent, the soft water and the steam, so the aim of fast removing the salt dirty on the blade is achieved, stopping is not needed in the cleaning process, and the production economical benefits are improved.

Description

technical field [0001] The invention relates to the technical field of steam turbines, in particular to a method and device for cleaning steam turbine blades at low temperature. Background technique [0002] In modern enterprises, steam turbines, as indispensable power operation equipment, have been widely used in metallurgy, chemical industry, pharmaceuticals, electric power, etc. , ships, nuclear power and other fields. [0003] As the power source of steam turbine, the quality of steam directly affects its heat conversion efficiency, which in turn restricts the level of load. If the quality of the steam is poor, it will cause salt scaling on the blades of the steam turbine, which will reduce the flow of steam and fail to reach the rated speed of the unit. Salt fouling on steam turbine blades seriously affects the size of the load. If it is not resolved in time, the axial thrust and axial displacement will increase. In severe cases, the blades will be damaged and the uni...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B08B3/08B08B13/00
CPCB08B3/02B08B3/08
Inventor 应天龙余东洋吴敏
Owner ANHUI WANBEI COAL REFCO GRP LTD HANSHAN HENGTAI NONMETALLIC MATERIALS BRANCH