CN117361675A - System and process for preventing cavitation of centrifugal pump - Google Patents
System and process for preventing cavitation of centrifugal pump Download PDFInfo
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- CN117361675A CN117361675A CN202210772620.1A CN202210772620A CN117361675A CN 117361675 A CN117361675 A CN 117361675A CN 202210772620 A CN202210772620 A CN 202210772620A CN 117361675 A CN117361675 A CN 117361675A
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- water
- deoxidized
- centrifugal pump
- water tank
- pressure
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- 238000000034 method Methods 0.000 title claims abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 245
- 238000009530 blood pressure measurement Methods 0.000 claims abstract 3
- 229920006395 saturated elastomer Polymers 0.000 claims description 42
- 239000007788 liquid Substances 0.000 claims description 13
- 230000001105 regulatory effect Effects 0.000 claims description 12
- 230000000670 limiting effect Effects 0.000 claims description 5
- 230000000087 stabilizing effect Effects 0.000 claims description 3
- 230000002265 prevention Effects 0.000 claims 1
- 230000007547 defect Effects 0.000 abstract description 2
- 239000012808 vapor phase Substances 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 26
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 8
- 239000001301 oxygen Substances 0.000 description 8
- 229910052760 oxygen Inorganic materials 0.000 description 8
- 230000015556 catabolic process Effects 0.000 description 5
- 239000000945 filler Substances 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 239000013589 supplement Substances 0.000 description 2
- 229910052786 argon Inorganic materials 0.000 description 1
- 238000006392 deoxygenation reaction Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/20—Treatment of water, waste water, or sewage by degassing, i.e. liberation of dissolved gases
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D1/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
-
- 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
- F04D29/708—Suction grids; Strainers; Dust separation; Cleaning specially for liquid pumps
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Degasification And Air Bubble Elimination (AREA)
Abstract
The invention provides a system and a process for preventing cavitation of a centrifugal pump, which are characterized by comprising a thermal deaerator, a deaeration water tank and a centrifugal pump, wherein the deaeration water tank is arranged at the lower part of the thermal deaerator, a water seal is arranged in the deaeration water tank, a pressure measuring point is arranged at the top of the deaeration water tank, the bottom of the deaeration water tank is communicated with the centrifugal pump through a first pipeline, and the thermal deaerator is also provided with a water inlet to be deaerated and a deaeration steam inlet. The invention changes the pressure measurement point of the water vapor mixing section of the deaerator into the vapor phase pressure measurement point at the top of the deaeration water tank. The indirect control of the pressure of the deoxidizing water tank is changed into direct control, and because the steam outlet is a thermal deoxidizer, the defect of great fluctuation of the indirect control of the pressure of the deoxidizing water tank is eliminated while deoxidizing is ensured.
Description
Technical Field
The invention relates to the field of centrifugal pumps, in particular to a system and a process for preventing cavitation of a centrifugal pump.
Background
The deoxidized water enters into a deoxidized water tank after passing through a steam thermal deoxidizer, the deoxidized water temperature of the deoxidized water tank is controlled to be 102+/-2 ℃, and the deoxidized water in the deoxidized water tank enters into steam generating equipment after being pressurized by a high-speed centrifugal pump. In order to maintain the effective steam thermal deoxidization effect of the deoxidizer, the negative feedback loop is used for automatically controlling the pressure of the water vapor mixing section below the water inlet distributor of the deoxidizer, but the pressure of the water vapor mixing section cannot be stably controlled due to the influence of the received steam pressure, the water inlet flow and the change of the water inlet pressure, the deoxidization water tank pressure also fluctuates greatly, the pressure is too high, the water seal breaks down, the temperature of the deoxidization water is too low, and cavitation damage is finally induced to the impeller and the guide wheel of the high-speed centrifugal pump.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, an object of the present invention is to provide a system and a process for preventing cavitation of a centrifugal pump, which are used for solving the problem of cavitation of a centrifugal pump in the prior art.
To achieve the above and other related objects, the present invention provides a system for preventing cavitation of a centrifugal pump, comprising a thermal deaerator, a deaerating water tank and a centrifugal pump, wherein the deaerating water tank is arranged at the lower part of the thermal deaerator, a water seal is arranged in the deaerating water tank, a pressure measuring point is arranged at the top of the deaerating water tank, the bottom of the deaerating water tank is communicated with the centrifugal pump through a first pipeline, and the thermal deaerator is also provided with a water inlet to be deaerated and a deaerating steam inlet.
Preferably, at least one of the following technical features is also included:
1) The top of the thermal deaerator is provided with a first valve;
2) The deoxygenated water inlet is externally connected with a deoxygenated water inlet second pipeline for inputting deoxygenated water to be deoxygenated, the deoxygenated steam inlet is externally connected with a deoxygenated steam third pipeline for inputting deoxygenated steam, the third pipeline comprises a main pipeline, the main pipeline is sequentially provided with a first pipe section, a second pipe section and a third pipe section along the deoxygenated steam input direction, the second pipe section is provided with a second valve, and a branch pipeline is arranged between the first pipe section and the third pipe section; a third valve is arranged between the first pipe section and the second pipe section, a fourth valve is arranged between the second pipe section and the third pipe section, and a fifth valve is arranged on the branch pipe;
4) The water inlet to be deoxygenated is arranged above the deoxygenated steam inlet.
Preferably, the system further comprises an overflow drain, one end of the water seal is communicated with the second pipeline, and the other end of the water seal is communicated with the overflow drain.
Preferably, the deoxidizing water tank is further provided with a pressure-stabilizing gas inlet, and the pressure-stabilizing inlet is externally connected with a fourth pipeline for inputting pressure-stabilizing gas.
Preferably, the fourth pipeline is provided with a sixth valve, a regulated gas flow limiting orifice plate and a seventh valve in sequence along the regulated gas input direction.
Preferably, the system comprises a level gauge provided on the side of the deoxygenated water tank.
The second aspect of the present invention also provides a process for preventing cavitation of a centrifugal pump, using the system for preventing cavitation of a centrifugal pump described in any one of the above, comprising:
1) Inputting the water to be deoxidized and deoxidized steam into a thermal deoxidizer to be deoxidized by mixing, so as to obtain deoxidized water;
2) And outputting the deoxidized water in a deoxidized water tank through a centrifugal pump.
Preferably, at least one of the following technical features is included:
1) The temperature of the deoxidized water is 100-102 ℃;
2) The pressure of the deoxidized water tank is 10-20KPa;
3) The water inflow of the water to be deoxidized is 35-45T/h;
4) The water inlet temperature of the deoxidized water is 30-35 ℃;
5) The liquid level of the deoxidized water tank is 50% -70% of the height of the deoxidized water tank;
6) The deoxidized steam is saturated steam with the pressure of 0.2-0.5 MPa.
The third aspect of the present invention also provides a process B for preventing cavitation of a centrifugal pump, using the system for preventing cavitation of a centrifugal pump described above, comprising:
1) Inputting the water to be deoxidized, the pressure-stabilizing gas and deoxidized steam into a thermal deoxidizer for mixed deoxidization to obtain deoxidized water;
2) And outputting the deoxidized water in a deoxidized water tank through a centrifugal pump.
Preferably, at least one of the following technical features is included:
1) The temperature of the deoxidized water is 100-102 ℃;
2) The pressure of the deoxidized water tank is 10-20KPa;
3) The water inflow of the water to be deoxidized is 35-45T/h;
4) The water inlet temperature of the deoxidized water is 30-35 ℃;
5) The liquid level of the deoxidized water tank is 50% -70% of the height of the deoxidized water tank;
6) The deoxidized steam is saturated steam with the pressure of 0.2-0.5 MPa;
7) The pressure stabilizing gas is low-pressure gas of 0.3-0.7 MPa.
As described above, the system and the process for preventing cavitation of the centrifugal pump have the following beneficial effects:
1) The pressure measuring point of the vapor mixing section of the deaerator is changed into the vapor phase pressure measuring point at the top of the deaerating water tank, and the indirect control of the pressure of the deaerating water tank is changed into direct control.
2) The invention uses saturated steam of 0.2-0.5Mpa, the pressure automatic control of the deoxidizing water tank is more stable than that of the saturated steam of 1.0Mpa, and meanwhile, the front-back differential pressure of the control valve is only 1/3 of the differential pressure when the saturated steam of 1.0Mpa is used, so that the opening of the control valve is much larger under the condition that the saturated steam enters a little, the effective regulation stability of the control valve is greatly increased, and the phenomenon of water seal breakdown is basically avoided.
3) According to the invention, one path of low-pressure stabilizing gas is injected into the gas phase part at the top of the deoxidizing water tank, so that the phenomenon that the water temperature is too high due to excessive saturated steam in the pressure increasing process is inhibited, and the effect of no temperature rise due to pressure increasing is effectively realized.
Drawings
Fig. 1 shows a schematic view of a system for preventing cavitation of a centrifugal pump according to the present invention.
Description of element reference numerals
1. Thermal deaerator
2. Deoxidizing water tank
3. Water seal
4. Pressure measuring point
5. First pipeline
6. Centrifugal pump
7. Water inlet for removing oxygen
8. Deoxidizing steam inlet
9. First valve
10. Second pipeline
11. Third pipeline
12. Main pipeline
121. First pipe section
122. Second pipe section
123. Third pipe section
13. Second valve
14. Branch pipeline
15. Third valve
16. Fourth valve
17. Fifth valve
18. Pressure-stabilizing gas inlet
19. Fourth pipeline
20. Sixth valve
21. Pressure-stabilizing gas flow-limiting orifice plate
22. Seventh valve
23. Liquid level meter
Detailed Description
Further advantages and effects of the present invention will become apparent to those skilled in the art from the disclosure of the present invention, which is described by the following specific examples.
Please refer to fig. 1. It should be understood that the structures, proportions, sizes, etc. shown in the drawings are for illustration purposes only and should not be construed as limiting the invention to the extent that it can be practiced, since modifications, changes in the proportions, or otherwise, used in the practice of the invention, are not intended to be critical to the essential characteristics of the invention, but are intended to fall within the spirit and scope of the invention. Also, the terms such as "upper," "lower," "left," "right," "middle," and "a" and the like recited in the present specification are merely for descriptive purposes and are not intended to limit the scope of the invention, but are intended to provide relative positional changes or modifications without materially altering the technical context in which the invention may be practiced.
As shown in fig. 1, the invention provides a system for preventing cavitation of a centrifugal pump, which is characterized by comprising a thermal deaerator 1, a deaeration water tank 2 and a centrifugal pump 6, wherein the deaeration water tank 2 is arranged at the lower part of the thermal deaerator 1, a water seal 3 is arranged in the deaeration water tank 2, a pressure measuring point 4 is arranged at the top of the deaeration water tank 2, the bottom of the deaeration water tank 2 is communicated with the centrifugal pump 6 through a first pipeline 5, and the thermal deaerator 1 is also provided with a water inlet 7 to be deaerated and a deaeration steam inlet 8.
According to the invention, the thermal deaerator 1 is arranged at the top of the deaeration water tank 2, saturated steam and salt water to be deaerated are reversely and uniformly contacted in the filler layer of the thermal deaerator 1, so that the temperature of the water to be deaerated is increased, then dissolved oxygen in the water to be deaerated is stripped, and the oxygen content in the salt water to be deaerated is effectively reduced.
The deoxidized water is internally provided with the water seal 3, and firstly, the deoxidized water tank 2 is maintained in a positive pressure state of 10-20KPa, so that the deoxidized water in the deoxidized water tank 2 is not boiled. Secondly, because the deoxidized water tank 2 is designed to bear lower pressure (no more than 100 KPa), the water seal 3 plays a role of a safety valve, and the breakdown value (equivalent to the tripping value of the safety valve) of the water seal 3 is 30KPa.
The top of the deoxidizing water tank 2 is provided with the pressure measuring point 4, and the steam outlet is the thermal deoxidizer 1, so that the defect of indirect control of the pressure of the deoxidizing water tank 2 to greatly fluctuate is overcome while deoxidizing is ensured.
Preferably, the top of the thermal deaerator 1 in the system is provided with a first valve 9, the first valve 9 is communicated with the outside, and the gas in the thermal deaerator 1 is discharged through a control valve. The deoxygenated water inlet 7 is externally connected with a deoxygenated water inlet second pipeline 10 for inputting deoxygenated water, and the deoxygenated steam inlet 8 is externally connected with a third pipeline 11 for inputting deoxygenated steam; the water inlet 7 to be deoxygenated is arranged above the deoxygenated steam inlet 8. The third pipeline 11 comprises a main pipeline 12, the main pipeline 12 is sequentially provided with a first pipe section 121, a second pipe section 122 and a third pipe section 123 along the deoxidizing steam input direction, the second pipe section 122 is provided with a second valve 13, and a branch pipeline 14 is arranged between the first pipe section 121 and the third pipe section 123; a third valve 15 is disposed between the first pipe section 121 and the second pipe section 122, a fourth valve 16 is disposed between the second pipe section 122 and the third pipe section 123, and a fifth valve 17 is disposed on the branch pipe 14.
More preferably, the system further comprises an overflow drain, one end of the water seal 3 is communicated with the second pipeline 10, the other end of the water seal is communicated with the overflow drain, the water seal is required to maintain the liquid seal and supplement water with uninterrupted small flow (compensate for the loss caused by evaporation), the water seal 3 is required to maintain a water level with a fixed height, the height of the water level determines a breakdown pressure set value (corresponding to the tripping value of a safety valve), the height of the overflow outlet of the water seal 3 determines the height of the fixed water level of the water seal 3, and the overflow drain 18 is a safe outlet for the overflow outlet of the water seal 3, so that redundant water supplement returns to a sewage well from the overflow outlet.
In the invention, the deoxidizing water tank 2 is also provided with a pressure-stabilizing gas inlet 18, and the pressure-stabilizing inlet is externally connected with a fourth pipeline 19 for inputting pressure-stabilizing gas. The stabilizator gas is usually a gas with stable properties, such as argon or nitrogen. In order to solve cavitation of the high-speed centrifugal pump 6, the invention has two directions: firstly, the temperature of the water to be deoxidized is reduced, and secondly, the pressure of the tank body is increased. The temperature of the water to be deoxygenated is reduced, so that the deoxygenation effect is influenced, the oxygen corrosion of the steam generating equipment is caused, and the dew point corrosion risk is brought to the boiler economizer in the subsequent process by the low temperature. However, increasing the pressure of the deoxidizing water tank 2 increases the usage amount of deoxidizing steam, which inevitably results in synchronous increase of the temperature of the water to be deoxidized, and this brings cavitation risk to the high-speed centrifugal pump 6. When the saturated steam of 1.0MPa of deoxidized steam is changed into the saturated steam of 0.2-0.5MPa, still heat is excessive, when a large amount of steam cannot be absorbed in a stage of relatively low water inflow of the deoxidizer, the pressure of the deoxidized water tank 2 rises suddenly and then breaks down the water seal 3, so that the tank body is communicated with the atmosphere, and the pressure at the inlet of the high-speed centrifugal pump 6 is synchronously reduced to induce cavitation. The invention also uses 0.2-0.5MPa steam and has the condition that the temperature of deoxidized water is higher (105 ℃), and the pressure-stabilizing gas is introduced into the top of the deoxidized water tank 2, so that the steam consumption is reduced on the premise of maintaining the pressure of the deoxidized water tank 2, the pressure is effectively increased without increasing the temperature, and finally, the process conditions which are not beneficial to cavitation of the high-speed centrifugal pump 6 and meet other working conditions of the device are created.
The invention changes the saturated steam of deoxidizing steam of 1.0MPa into the saturated steam of 0.2-0.5MPa, the pressure of the deoxidizing water tank is more stable than that of the deoxidizing water tank when the saturated steam of 1.0MPa is used, in particular, the deoxidizing steam can use the saturated steam of 0.5MPa and the saturated steam of 1.0MPa, and the difference of the enthalpy values is not great, so that the deoxidizing water tank and the deoxidizing water tank can meet the thermal deoxidizing requirement of deoxidizing water. Through rough calculation, the device heats 35-45T/h deoxidized water to 100 ℃ and approximately needs 3-4T/h saturated steam, when 0.5MPa saturated steam (actually 0.35MPa saturated steam) is used through actual operation comparison, the pressure of the deoxidized water tank is automatically controlled to be more stable than that of the deoxidized water tank when 1.0MPa saturated steam is used, namely when 1.0MPa saturated steam is used, the water seal of the deoxidized water tank is often broken down easily, and once broken down, the cavitation phenomenon of a centrifugal pump is aggravated. The reason why water seal breakdown is easily caused by using saturated steam of 1.0MPa is that: because the pressure of the deoxidizing water tank is controlled to be 10-20KPa, the saturated steam pressure of 1.0MPa is 1000KPa, the front-rear differential pressure of the pressure control valve is large, the opening degree of the control valve is small, when the pressure fluctuation of the deoxidizing water tank is caused by the change of the inflow of deoxidizing water, a great amount of steam can enter the deoxidizing device and the deoxidizing water tank when the control valve is slightly opened, and when the pressure of the tank body is more than 30KPa, the water seal breaks down.
However, when saturated steam of 0.2-0.5MPa is used for deoxidizing, the differential pressure before and after the control valve is only 1/3 of that when saturated steam of 1.0MPa is used, so that the opening of the control valve is much larger under the condition that the steam inlet amount is almost similar, the effective regulation stability of the control valve is greatly increased, the phenomenon of water seal breakdown is basically avoided, and the thermodynamic data of saturated steam of 0.5MPa and 1.0MPa are as follows:
| steam species | Actual pressure | Actual temperature | Enthalpy value |
| Saturated steam of 0.5MPa | 0.35MPa | 159.1℃ | 2732Kj/Kg |
| 1.0MPa saturated steam | 1.0Mpa | 179.8℃ | 2777Kj/Kg |
In the present invention, the fourth pipeline 19 is sequentially provided with a sixth valve 20, a regulated gas flow limiting orifice 21, and a seventh valve 22 along the regulated gas input direction, where the regulated gas flow limiting effect of the regulated gas orifice is to prevent the regulated gas amount injected into the deoxygenated water tank 2 from being affected by the regulated gas pressure and the deoxygenated water tank 2 pressure. In addition, the pressure-stabilizing gas flow-limiting orifice plate 21 is arranged between the two valves and can be replaced on line to adapt to the requirements of working conditions under different treatment capacities, and a 10+/-5 mm orifice plate can be used, for example, 5mm,6mm,7mm,8mm,9mm,10mm,11mm,12mm,13mm,14mm and 15mm. The flow rate of the regulated gas is 50+/-25 Nm 3 The regulated gas flow orifice 21 of/h may be, for example, 25Nm 3 /h，30Nm 3 /h，35Nm 3 /h，40Nm 3 /h，45Nm 3 /h，50Nm 3 /h，55Nm 3 /h，60Nm 3 /h，65Nm 3 /h，70Nm 3 /h，75Nm 3 /h。
Preferably, the invention comprises a liquid level meter 23, wherein the liquid level meter 23 is arranged on the side surface of the deoxidizing water tank 2 and is used for observing the water level of the deoxidizing water tank 2 and controlling the liquid level of the deoxidizing water tank 2 to be 50% -70% of the height of the deoxidizing water tank.
Example 1
The water to be deoxidized and saturated steam of 1.0Mpa are input into the thermal deoxidizer 1 for mixing, the pressure of the deoxidizing water tank 2 is controlled to be 25Kpa, the water inflow of the deoxidizing water tank 2 is controlled to be 42T/h, the water level of the deoxidizing water tank 2 is 60% of the height of the deoxidizing water tank, the second valve 13, the third valve 15 and the fourth valve 16 are controlled to be 8% of the opening degree of the deoxidizing water tank, the saturated steam and the water to be deoxidized are reversely and uniformly contacted in the filler layer of the thermal deoxidizer 1 for deoxidizing, dissolved oxygen in the water to be deoxidized is stripped, the deoxidizing water is obtained, the temperature of the deoxidizing water is 109.3 ℃, and the deoxidizing water is output in the deoxidizing water tank 2 through the centrifugal pump 6.
Example 2
The water to be deoxidized and saturated steam of 0.5Mpa are input into the thermal deoxidizer 1 for mixing, the pressure of the deoxidizing water tank 2 is controlled to be 25Kpa, the water inflow of the deoxidizing water tank 2 is controlled to be 42T/h, the water level of the deoxidizing water tank 2 is 60% of the height of the deoxidizing water tank, the second valve 13, the third valve 15 and the fourth valve 16 are controlled to be 48% of the opening of the deoxidizing water tank, the saturated steam and the water to be deoxidized are reversely and uniformly contacted in the filler layer of the thermal deoxidizer 1 for deoxidizing, the dissolved oxygen in the water to be deoxidized is stripped, the deoxidizing water is obtained, the temperature of the deoxidizing water is 109 ℃, and the deoxidizing water is output in the deoxidizing water tank 2 through the centrifugal pump 6.
It can be seen from examples 1 and 2 that when saturated steam of 1.0Mpa is changed into saturated steam of 0.5Mpa under the condition of ensuring the same pressure of the deaerator, the temperature of deaerated water is reduced, which is beneficial to preventing cavitation of the centrifugal pump 6.
Example 3
The water to be deoxidized and saturated steam of 1Mpa are input into a thermal deoxidizer 1 to be mixed, and simultaneously, 50Nm is introduced 3 The pressure of the deoxidizing water tank 2 is controlled to be 25Kpa, the water inflow of the deoxidizing water is 42T/h, the water level of the deoxidizing water tank 2 is 60% of the height of the deoxidizing water tank, the second valve 13, the third valve 15 and the fourth valve 16 are controlled to be 6% of the opening degree of the deoxidizing water tank, saturated steam and the water to be deoxidized reversely and uniformly contact and deoxidize in the filler layer of the thermal deoxidizer 1, dissolved oxygen in the water to be deoxidized is stripped, deoxidized water is obtained, the temperature of the deoxidized water is 104 ℃, and then the deoxidized water is output in the deoxidizing water tank 2 through the centrifugal pump 6.
It can be seen from examples 1 and 3 that under the condition of ensuring the same pressure of the deaerator, saturated low-pressure nitrogen is introduced to divide pressure, so that the temperature of deaerated water can be reduced, and cavitation of the centrifugal pump 6 can be prevented.
Example 4
Introducing water to be deoxygenated and saturated steam of 0.5Mpa into a thermal deoxygenator 1, mixing, and introducing 50Nm 3 The pressure of the deoxidizing water tank 2 is controlled to be 25Kpa, the water inflow of the deoxidizing water is 42T/h, the water level of the deoxidizing water tank 2 is 60% of the height of the deoxidizing water tank, the second valve 13, the third valve 15 and the fourth valve 16 are controlled to be 48% of the opening, saturated steam and the water to be deoxidized reversely and uniformly contact and deoxidize in the filler layer of the thermal deoxidizer 1, dissolved oxygen in the water to be deoxidized is stripped, deoxidized water is obtained, the temperature of the deoxidized water is 109 ℃, and then the deoxidized water is output in the deoxidizing water tank 2 through the centrifugal pump 6.
It can be seen from examples 2 and 4 that the temperature of the deoxidized water can be obviously reduced when the saturated water vapor of 1.0Mpa is changed into the saturated water vapor of 0.5Mpa while the pressure of the deoxidized water device is ensured to be the same, thereby being beneficial to preventing the cavitation of the centrifugal pump 6.
In summary, the present invention effectively overcomes the disadvantages of the prior art and has high industrial utility value.
The above embodiments are merely illustrative of the principles of the present invention and its effectiveness, and are not intended to limit the invention. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the invention. Accordingly, it is intended that all equivalent modifications and variations of the invention be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.
Claims (10)
1. The utility model provides a prevent system of centrifugal pump cavitation, its characterized in that, includes thermal deaerator (1), deoxidization water pitcher (2), centrifugal pump (6), deoxidization water pitcher (2) are located the lower part of thermal deaerator (1), deoxidization water pitcher (2) inside is equipped with water seal (3), deoxidization water pitcher (2) top is equipped with pressure measurement point (4), deoxidization water pitcher (2) bottom is through first pipeline (5) and centrifugal pump (6) intercommunication, thermal deaerator (1) still is equipped with and waits deoxidization water inlet (7) and deoxidization steam inlet (8).
2. A system for preventing cavitation of a centrifugal pump according to claim 1, wherein: further comprising at least one of the following technical features:
1) The top of the thermal deaerator (1) is provided with a first valve (9);
2) The deoxygenated water inlet (7) is externally connected with a second pipeline (10) to input deoxygenated water, the deoxygenated steam inlet (8) is externally connected with a third pipeline (11) to input deoxygenated steam, the third pipeline (11) comprises a main pipeline (12), the main pipeline (12) is sequentially provided with a first pipeline section (121), a second pipeline section (122) and a third pipeline section (123) along the deoxygenated steam input direction, the second pipeline section (122) is provided with a second valve (13), a branch pipeline (14) is arranged between the first pipeline section (121) and the third pipeline section (123), a third valve (15) is arranged between the first pipeline section (121) and the second pipeline section (122), a fourth valve (16) is arranged between the second pipeline section (122) and the third pipeline section (123), and a fifth valve (17) is arranged on the branch pipeline (14);
3) The water inlet (7) to be deoxygenated is arranged above the deoxygenated steam inlet (8).
3. A system for preventing cavitation of a centrifugal pump as recited in claim 1, wherein: the system also comprises an overflow port floor drain, one end of the water seal (3) is communicated with the second pipeline (10), and the other end of the water seal is communicated with the overflow port floor drain.
4. A system for preventing cavitation of a centrifugal pump as recited in claim 1, wherein: the deoxygenated water tank (2) is also provided with a pressure-stabilizing gas inlet (18), and the pressure-stabilizing gas inlet (18) is externally connected with a fourth pipeline (19) for inputting pressure-stabilizing gas.
5. A system for preventing cavitation of a centrifugal pump as recited in claim 4, wherein: the fourth pipeline (19) is sequentially provided with a sixth valve (20), a regulated gas flow limiting orifice plate (21) and a seventh valve (22) along the regulated gas input direction.
6. A system for preventing cavitation of a centrifugal pump as recited in claim 1, wherein: the device comprises a liquid level meter (23), wherein the liquid level meter (23) is arranged on the side surface of the deoxidizing water tank (2).
7. A technology for preventing cavitation of a centrifugal pump is characterized in that: a system for preventing cavitation of a centrifugal pump 6 according to any one of claims 1 to 6, comprising:
1) Inputting the water to be deoxidized and saturated steam into a thermal deoxidizer for mixed deoxidization to obtain deoxidized water;
2) And outputting the deoxidized water in a deoxidized water tank through a centrifugal pump.
8. The centrifugal pump cavitation prevention a process of claim 7, wherein: at least one of the following technical characteristics:
1) The temperature of the deoxidized water is 100-102 ℃;
2) The pressure of the deoxidized water tank is 10-20KPa;
3) The water inflow of the water to be deoxidized is 35-45T/h;
4) The water inlet temperature of the deoxidized water is 30-35 ℃;
5) The level of the deoxidized water tank liquid is 50% -70% of the height of the deoxidized water tank liquid;
6) The deoxidized steam is saturated steam with the pressure of 0.2-0.5 MPa.
9. A technology B for preventing cavitation of a centrifugal pump is characterized in that: a system for preventing cavitation of a centrifugal pump according to claim 4 or 5, comprising:
1) Inputting the water to be deoxidized, the pressure-stabilizing gas and the saturated steam into a thermal deoxidizer for mixed deoxidization to obtain deoxidized water;
2) And outputting the deoxidized water in a deoxidized water tank through a centrifugal pump.
10. The process B for preventing cavitation of a centrifugal pump according to claim 9, wherein: at least one of the following technical characteristics:
1) The temperature of the deoxidized water is 100-102 ℃;
2) The pressure of the deoxidized water tank is 10-20KPa;
3) The water inflow of the water to be deoxidized is 35-45T/h;
4) The water inlet temperature of the deoxidized water is 30-35 ℃;
5) The level of the deoxidized water tank liquid is 50% -70% of the height of the deoxidized water tank liquid;
6) The deoxidized steam is saturated steam with the pressure of 0.2-0.5 MPa;
7) The pressure stabilizing gas is low-pressure gas of 0.3-0.7 MPa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210772620.1A CN117361675A (en) | 2022-06-30 | 2022-06-30 | System and process for preventing cavitation of centrifugal pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210772620.1A CN117361675A (en) | 2022-06-30 | 2022-06-30 | System and process for preventing cavitation of centrifugal pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117361675A true CN117361675A (en) | 2024-01-09 |
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ID=89397119
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210772620.1A Pending CN117361675A (en) | 2022-06-30 | 2022-06-30 | System and process for preventing cavitation of centrifugal pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117361675A (en) |
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2022
- 2022-06-30 CN CN202210772620.1A patent/CN117361675A/en active Pending
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