CN111894912A - Off-line washing method for compressor of gas turbine combined cycle unit - Google Patents
Off-line washing method for compressor of gas turbine combined cycle unit Download PDFInfo
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- CN111894912A CN111894912A CN202010787707.7A CN202010787707A CN111894912A CN 111894912 A CN111894912 A CN 111894912A CN 202010787707 A CN202010787707 A CN 202010787707A CN 111894912 A CN111894912 A CN 111894912A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/70—Suction grids; Strainers; Dust separation; Cleaning
- F04D29/701—Suction grids; Strainers; Dust separation; Cleaning especially adapted for elastic fluid pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/70—Suction grids; Strainers; Dust separation; Cleaning
- F04D29/701—Suction grids; Strainers; Dust separation; Cleaning especially adapted for elastic fluid pumps
- F04D29/705—Adding liquids
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- General Engineering & Computer Science (AREA)
- Control Of Positive-Displacement Pumps (AREA)
Abstract
The invention relates to the technical field of compressor washing, and discloses a compressor off-line washing method of a gas turbine combined cycle unit, which comprises the following steps of firstly, detecting the water level and the water temperature of a washing tank and the air temperature at the inlet of a compressor, and determining that the set requirements are met; detecting that the temperature between turbine wheels of the gas turbine is lower than a set temperature by 150 DEG F; forcing the vacuum degree and the drum water level of the unit to meet the starting conditions of the unit in a manual control mode; step four, starting off-line washing operation on the operation system, running the unit at a first rotating speed, and washing the unit with clean water; step five, the unit runs at a second rotating speed, and the unit is cleaned by detergent; step six, stopping the unit, and soaking and cleaning the unit; running the unit at a third rotating speed, and rinsing the unit by using clear water; and step eight, the unit operates at a fourth rotating speed to perform spin-drying operation. The off-line water washing method does not need to start auxiliary equipment, and reduces the off-line water washing cost.
Description
Technical Field
The invention relates to the technical field of compressor washing, in particular to a compressor off-line washing method of a gas turbine combined cycle unit.
Background
A9F gas-steam combined generator set belongs to a large-scale gas generator set of a new technology in China, a gas turbine needs to continuously suck air during operation, the air possibly contains dust, dust and the like, the dust and the like are continuously deposited in a gas compressor to cause the reduction of pressure ratio and efficiency, the pressure ratio and the flow of the gas compressor are influenced, the reduction of the power and the efficiency of a gas turbine is directly caused, the safety, the reliability and the economy of the generator set are reduced, and therefore the gas compressor needs to be subjected to off-line water washing through a water solution containing a detergent. China has no mature experience on the water washing period of the compressor, and many power plants wash the compressor according to the instruction of manufacturers.
When the compressor is washed off-line according to the manufacturer's instruction, for example, in an off-line washing operation mode provided by general electric company, the off-line washing of the compressor is a standard for normal operation of the gas turbine combined cycle unit, and when the unit is normally started, it is necessary to ensure that main parameters such as the vacuum degree of the turbine, the shaft seal temperature, the water level of a boiler drum and the like must reach the unit starting condition for washing, and in order to meet the parameters, the relevant auxiliary equipment such as the boiler, the open type circulating water pump, the condensate water pump, the vacuum pump, the shaft air blower and the like need to be started to maintain operation. The off-line water washing is that the gas turbine runs in a cold-dragging mode after the unit is shut down, the mixed washing liquid of the washing liquid and water is adopted to thoroughly wash the blades of the gas compressor, boiler water supply is not needed, the rotating speed and the like during the water washing are much lower than the running state of the unit during the opening, the unit does not need to have the vacuum degree during normal working, resources are wasted due to the fact that related auxiliary equipment is opened, and the cost of the off-line water washing is improved.
Disclosure of Invention
The purpose of the invention is: the method for washing the gas compressor of the gas turbine combined cycle unit off line is provided, and the problems that in the prior art, the normal operation of the gas turbine combined cycle unit is used as a starting standard during washing of the gas compressor, resources are wasted, and the cost of off-line washing is increased are solved.
In order to achieve the aim, the invention provides an off-line washing method for a gas compressor of a gas turbine combined cycle unit, which comprises the following steps of firstly, detecting the water level and the water temperature of a washing tank and the air temperature at the inlet of the gas compressor, and determining that the water level and the water temperature of the washing tank and the air temperature at the inlet of the gas compressor meet set requirements; detecting that the temperature between turbine wheels of the gas turbine is lower than a set temperature, wherein the set temperature is 150 DEG F; changing the starting condition of the unit of the operating system in a manual control mode, and forcing the vacuum degree and the steam drum water level of the unit to meet the starting condition of the unit; step four, starting off-line washing operation on the operation system, running the unit at a first rotating speed, starting a washing pump, and washing the unit by using clean water; step five, adding a detergent into the unit, operating the unit at a second rotating speed, and cleaning the unit by using the detergent; step six, stopping the unit, and soaking and cleaning the unit; running the unit at a third rotating speed, and rinsing the unit by using clear water; and step eight, starting the unit, and operating the unit at a fourth rotating speed to perform spin-drying operation.
Preferably, in step one, the water level in the water washing tank is no lower than 3/4 at the highest water level and the water temperature in the water tank is no lower than 75 ° f.
Preferably, in the first step, the air temperature at the inlet of the compressor is not lower than 10 ℃.
Preferably, in the fourth step, the first rotating speed is 540rpm, and the time for washing the unit with clean water is 60 seconds.
Preferably, in step five, the flow rate of the detergent is 10-12 GPM.
Preferably, in the fifth step, the second rotating speed is variable, the detergent is injected into the unit for eight times, the second rotating speed of the unit is 540rpm when the detergent is injected for the first time, and the first injection time of the detergent is 1 minute; after the detergent is injected for the first time, the second rotating speed of the unit is 435rpm, the detergent is injected for the second time to the sixth time in sequence after 4 minutes, the injection time of each detergent is 1 minute, and the interval time is 4 minutes; after the detergent is injected for the sixth time, the interval is 3 minutes, the second rotating speed of the unit is reduced, and the detergent is injected for the seventh time to the eighth time in sequence, wherein the injection time of the detergent is 1 minute each time, and the interval time is 3 minutes; and after the 8 th injection of the detergent is finished, the washing pump automatically stops running.
Preferably, in the sixth step, the jigger runs at a speed of 4rpm during soaking and cleaning, and the soaking time of the unit is 30 minutes.
Preferably, in the seventh step, during the rinsing operation, the third rotation speed of the unit is 435rpm, the rinsing is performed in a pulse manner, 30 rinsing cycles are performed, the interval between two adjacent rinsing cycles is 3.5 minutes, and the time of each rinsing cycle is 60 seconds.
Preferably, in the seventh step, the water quality is detected after rinsing, and if the water quality does not reach the standard, the rinsing operation is continued until the water quality reaches the standard.
Preferably, in step eight, the fourth speed is 399rpm, and the unit is operated for 60 minutes at the fourth speed.
Compared with the prior art, the off-line washing method for the compressor of the gas turbine combined cycle unit has the beneficial effects that: during off-line washing, the starting condition of the unit of the operating system is changed in a manual control mode, the vacuum degree and the steam drum water level of the unit are forced to meet the starting condition of the unit, the operations of starting a boiler and adjusting the vacuum degree of the unit during washing are avoided, the set temperature for detection among turbine wheels of the gas turbine is determined to be 150 DEG F, the set position value of the operating system is prevented from changing in the washing process, auxiliary equipment does not need to be started, and the off-line washing cost is reduced.
Drawings
FIG. 1 is a schematic flow diagram of a compressor off-line water wash method of a gas turbine combined cycle plant of the present invention.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
In the preferred embodiment of the method for washing the compressor of the gas turbine combined cycle unit offline, as shown in fig. 1, the method for washing the compressor of the gas turbine combined cycle unit offline is used for washing the compressor of a 9FA heavy-duty gas turbine combined cycle unit offline periodically, and when the compressor of the 9FA heavy-duty gas turbine combined cycle unit is washed offline, a Mark vi operating system of GE (general electric company) is adopted to carry out offline washing operation during unit maintenance.
The off-line washing method for the gas compressor of the gas turbine combined cycle unit comprises the following steps of:
detecting the water level and the water temperature of the washing tank and the air temperature of the inlet of the air compressor, and determining that the water level and the water temperature of the washing tank and the air temperature of the inlet of the air compressor meet set requirements.
Preferably, the water wash tank has a water level not less than 3/4 of the maximum water level, a water temperature in the tank no less than 75 ° f inward, and an air temperature at the compressor inlet no less than 10 ℃ to confirm that the offline water wash isolation measure of the gas turbine combined cycle plant has been fully implemented. The water level of the washing tank is not lower than 3/4 of the highest water level, which can provide enough washing water for off-line washing operation, ensure that the washing operation is completed at one time, the water temperature is not lower than 75 DEG F, and can improve the washing efficiency.
And secondly, detecting that the temperature between turbine wheels of the gas turbine is lower than a set temperature, wherein the set temperature is 150 DEG F. Mark vi operating system of GE corporation (general electric) defaults to a set temperature of a gas turbine wheel set that is a variable value, which is counted using compressor inlet temperature and unit rotational speed as calculation variables such that even if the maximum inter-wheel temperature of the gas turbine is below 150 DEG F before off-line water washing and is allowed to start, after the unit is started during off-line water washing operation, it is also possible that the wash allowable inter-wheel temperature values are slightly below 150 DEG F due to sudden changes in compressor inlet temperature or changes in unit rotational speed, therefore, the off-line washing procedure is stopped because the temperature condition among the wheels is not satisfied, but the safe operation can be ensured as long as the temperature among the wheels is lower than 150 DEG F when the unit runs at low speed, therefore, the temperature setting between turbine wheels of the gas turbine is manually determined to be 150 DEG F, so that the operation stop caused by the allowable temperature change can be avoided, and the efficiency of off-line water washing can be improved.
And step three, changing the starting conditions of the unit of the operating system in a manual control mode, and forcing the vacuum degree and the steam drum water level of the unit to meet the starting conditions of the unit.
Preferably, the vacuum degree of the unit takes the vacuum degree of a condenser as a constant value, the vacuum degree of the condenser is less than 127mmHg, namely the vacuum degree of the condenser is manually input into a Mark VI e operating system, and the vacuum degree of the condenser is less than 170 mmHg as a default. The vacuum degree is used for reducing the pressure value between the vanes in the unit, the air of the unit between the vanes is prevented from rubbing with the vanes to increase heat when the unit is started, the rotating speed of the unit in normal work is high, and therefore the heat generated after rubbing with the air is large, but the rotating speed of the unit in off-line water washing is far lower than that in normal work, and therefore the vacuum degree of the unit in normal work is not required to be maintained. And a manual input mode is adopted to input a vacuum degree value to the Mark VI operating system, the default vacuum degree meets the requirement of starting the unit, the starting of related auxiliary equipment can be avoided, and the cost is reduced.
And step four, starting off-line washing operation on the operation system, enabling the unit to run at the first rotating speed, starting the washing pump, and washing the unit by using clean water. Specifically, selecting Off Line Water Wash ON ON the Mark VI operating system, selecting a Crank in the running mode, clicking a Start button to Start the unit, and starting Off-Line Water washing.
Preferably, the first rotating speed is 540rpm, after the rotating speed of the unit is increased to 540rpm, the adjustable guide vane IGV at the inlet of the air compressor is automatically opened to the maximum angle, the washing pump is started, the off-line washing pneumatic valve sprays clean water to the blades of the air compressor, the washing time of the clean water to the unit is 60 seconds, and after the washing of the clean water is finished, the washing pump stops operating.
And step five, adding a detergent into the unit, operating the unit at a second rotating speed, and cleaning the unit by using the detergent.
Preferably, the flow of the detergent is 10-12 GPM, a manual valve at the outlet of the detergent box is opened, the flow of the detergent is adjusted by the manual valve, an 'initial Wash' (Start washing) button is clicked on a Mark VI operation system, the water washing pump is started, an off-line water washing pneumatic valve is opened, and the detergent is injected into the unit.
Preferably, when the unit is cleaned by adopting the detergent, the second rotating speed of the unit is taken as a variable, the detergent is injected into the unit for eight times, the second rotating speed of the unit is 540rpm when the detergent is injected for the first time, and the first injection time of the detergent is 1 minute; after the detergent is injected for the first time, the rotating speed of the unit is reduced to 435rpm, the second rotating speed of the unit is 435rpm, the detergent is injected for the second time to the sixth time in sequence after 4 minutes, the injection time of each detergent is 1 minute, and the interval time is 4 minutes; after the detergent is injected for the sixth time, the interval is 3 minutes, the second rotating speed of the unit is reduced, and the detergent is injected for the seventh time to the eighth time in sequence, wherein the injection time of the detergent is 1 minute each time, and the interval time is 3 minutes; and after the 8 th injection of the detergent is finished, the washing pump automatically stops running.
And step six, stopping the unit, and soaking and cleaning the unit.
Preferably, during soaking and cleaning, the unit assembly is reduced to 0rpm, the jigger is put into operation, the jigger operates at the speed of 4rpm, and the unit soaking time is 30 minutes. During soaking, a manual valve at the outlet of the detergent box is closed, the washing three-way valve is switched to a sewage discharge position, the washing pump is manually started, and the washing supply pipeline is washed for 10 minutes by using clean water. And after the washing is finished, the washing three-way valve is switched to a washing position, and the washing pump is switched to an automatic mode.
And step seven, the unit runs at a third rotating speed, and the unit is rinsed by using clean water. Specifically, the "Initiate Ring" (start Rinse) button is clicked on the Mark VI e operating system to start rinsing.
Preferably, in the rinsing operation, the third rotation speed of the unit is 435rpm, the rinsing is performed in a pulse mode, 30 rinsing cycles are performed totally, the interval between two adjacent rinsing cycles is 3.5 minutes, and the time of each rinsing cycle is 60 seconds.
Preferably, after 30 times of rinsing cycles are completed, sampling is carried out on the sewage, the quality of the sewage discharged by the unit is tested, if the water quality does not reach the standard, 5 times of rinsing cycles are carried out in the rinsing mode, and sampling and testing are carried out on the sewage until the quality of the sewage is qualified. After rinsing is finished, clicking an End Ring button on a Mark VI operating system, clicking a Stop button, selecting an Off Line Water OFF, starting to reduce the rotating speed of the unit, and automatically putting into operation and turning the vehicle after the rotating speed of the unit reaches zero.
And step eight, starting the unit, and operating the unit at a fourth rotating speed to perform spin-drying operation. Selecting a 'Crank' (cold drawing) on a Mark VI operating system, clicking a 'Start' (Start) button, and performing spin-drying operation.
Preferably, the fourth speed is 399rpm and the unit is run for 60 minutes at the fourth speed. And after the completion, clicking a Stop button on a Mark VI e operating system, reducing the rotating speed of the unit, automatically putting into operation and turning the vehicle after the rotating speed reaches zero, and finishing the off-line water washing process.
And step nine, removing the forced signals of the unit on the Mark VI operating system about condenser vacuum, high, medium and low pressure steam drum water level and washing allowable inter-wheel temperature, removing the unit offline washing isolation measure, and recovering the unit to a standby state.
To sum up, the embodiment of the present invention provides an offline washing method for a compressor of a gas turbine combined cycle unit, which changes a starting condition of a unit of an operating system in an offline washing manner by using a manual control manner, forces a vacuum degree and a drum water level of the unit to meet the starting condition of the unit, avoids starting a boiler operation and adjusting the vacuum degree operation of the unit during washing, determines a set temperature detected between turbine wheels of a gas turbine to be 150 ° f, avoids a set position value of the operating system from changing during washing, does not need to start auxiliary equipment, and reduces the cost of offline washing.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.
Claims (10)
1. The off-line washing method for the compressor of the gas turbine combined cycle unit is characterized by comprising the following steps of detecting the water level and the water temperature of a washing tank and the air temperature at the inlet of the compressor, and determining that the water level and the water temperature of the washing tank and the air temperature at the inlet of the compressor meet set requirements; detecting that the temperature between turbine wheels of the gas turbine is lower than a set temperature, wherein the set temperature is 150 DEG F; changing the starting condition of the unit of the operating system in a manual control mode, and forcing the vacuum degree and the steam drum water level of the unit to meet the starting condition of the unit; step four, starting off-line washing operation on the operation system, running the unit at a first rotating speed, starting a washing pump, and washing the unit by using clean water; step five, adding a detergent into the unit, operating the unit at a second rotating speed, and cleaning the unit by using the detergent; step six, stopping the unit, and soaking and cleaning the unit; running the unit at a third rotating speed, and rinsing the unit by using clear water; and step eight, starting the unit, and operating the unit at a fourth rotating speed to perform spin-drying operation.
2. The gas turbine combined cycle unit compressor off-line water wash method as set forth in claim 1, wherein in step one, the water wash tank is not below 3/4 of maximum water level and the water tank has an inward water temperature of not less than 75 ° f.
3. The method for offline water washing the compressor of the gas turbine combined cycle plant according to claim 1, wherein in the first step, the air temperature at the inlet of the compressor is not lower than 10 ℃.
4. The method for washing the compressor of the gas turbine combined cycle unit offline as set forth in any one of claims 1 to 3, wherein in the fourth step, the first rotation speed is 540rpm, and the time for washing the unit with clean water is 60 seconds.
5. The compressor offline water-washing method of the gas turbine combined cycle unit according to any one of claims 1 to 3, wherein in the fifth step, the flow rate of the detergent is 10 to 12 GPM.
6. The offline water washing method for the compressor of the gas turbine combined cycle unit according to claim 5, wherein in the fifth step, the second rotating speed is variable, the detergent is injected into the unit for eight times, the second rotating speed of the unit is 540rpm when the detergent is injected for the first time, and the time for injecting the detergent for the first time is 1 minute; after the detergent is injected for the first time, the second rotating speed of the unit is 435rpm, the detergent is injected for the second time to the sixth time in sequence after 4 minutes, the injection time of each detergent is 1 minute, and the interval time is 4 minutes; after the detergent is injected for the sixth time, the interval is 3 minutes, the second rotating speed of the unit is reduced, and the detergent is injected for the seventh time to the eighth time in sequence, wherein the injection time of the detergent is 1 minute each time, and the interval time is 3 minutes; and after the 8 th injection of the detergent is finished, the washing pump automatically stops running.
7. The off-line water washing method for the compressor of the gas turbine combined cycle unit according to any one of claims 1 to 3, wherein in the sixth step, the jigger is operated at a speed of 4rpm during soaking washing, and the soaking time of the unit is 30 minutes.
8. The compressor offline water-washing method of the gas turbine combined cycle plant according to any one of claims 1 to 3, wherein in the seventh step, the third rotation speed of the plant during the rinsing operation is 435rpm, the rinsing operation is performed in a pulse mode, 30 rinsing cycles are performed in total, the interval between two adjacent rinsing cycles is 3.5 minutes, and the time of each rinsing cycle is 60 seconds.
9. The offline compressor water-washing method of the gas turbine combined cycle unit as set forth in claim 8, wherein in the seventh step, the water quality is detected after rinsing, and if the water quality does not reach the standard, the rinsing operation is continued until the water quality reaches the standard.
10. The compressor offline water-washing method of the gas turbine combined cycle plant according to any one of claims 1 to 3, wherein in the eighth step, the fourth rotation speed is 399rpm, and the plant is operated at the fourth rotation speed for 60 minutes.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010787707.7A CN111894912A (en) | 2020-08-07 | 2020-08-07 | Off-line washing method for compressor of gas turbine combined cycle unit |
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| CN202010787707.7A CN111894912A (en) | 2020-08-07 | 2020-08-07 | Off-line washing method for compressor of gas turbine combined cycle unit |
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