CN219390590U - High-efficient vacuum pumping system of two backpressure condensers - Google Patents
High-efficient vacuum pumping system of two backpressure condensers Download PDFInfo
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- CN219390590U CN219390590U CN202320591588.7U CN202320591588U CN219390590U CN 219390590 U CN219390590 U CN 219390590U CN 202320591588 U CN202320591588 U CN 202320591588U CN 219390590 U CN219390590 U CN 219390590U
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Abstract
The utility model relates to the technical field of power generation systems, in particular to a high-efficiency vacuumizing system with double back pressure condensers, which is provided with a low back pressure condenser and a high back pressure condenser, wherein the low back pressure condenser and the high back pressure condenser are communicated through a condensate communicating pipe, two low back pressure vacuumizing holes are formed in the low back pressure condenser and are respectively connected with a low back pressure vacuumizing main pipe through a first low pressure vacuumizing pipe and a second low pressure vacuumizing pipe, two high back pressure vacuumizing holes are formed in the high back pressure condenser and are respectively connected with the high back pressure vacuumizing main pipe through the first high pressure vacuumizing pipe and the second high back pressure vacuumizing pipe, the low back pressure vacuumizing main pipe and the high back pressure vacuumizing main pipe are connected through a vacuumizing connecting pipe, and the vacuumizing connecting pipe is sequentially connected with a first vacuum pipe, a second vacuum pipe, a third vacuum pipe and a fourth vacuum pipe.
Description
Technical Field
The utility model relates to the technical field of power generation systems, in particular to a high-efficiency vacuumizing system of a double-backpressure condenser, which has the advantages of simple structure, electric energy saving, no blockage of air extraction and good air extraction performance.
Background
It is well known that the main function of a condenser is to create a vacuum (about 4.9 kPa) in the exhaust section of a turbine so that the steam can work to its maximum and then cool it to condensate that is recovered into the thermal well. The condenser can realize the function by means of the cooperation of a vacuum pumping system and a circulating water system. The vacuum pumping system pumps out non-condensable gas; the circulating water system takes away the steam condensation heat in time, ensures that the steam is continuously condensed, recovers working media and ensures high vacuum of a steam exhaust part.
With the development of large-scale thermal power generation technology, more energy-saving double-back pressure condensers are arranged on the steam turbine with the size of more than 600MW, namely, the condenser of the same steam turbine comprises a high-back pressure condenser and a low-back pressure condenser, the design pressure (vacuum) of the high-back pressure condenser is about 5.4-7.4 kPa, the design pressure (vacuum) of the low-back pressure condenser is about 4.4-6.4 kPa, the pressure difference is 1-1.5 kPa, the average pressure (back pressure) is 4.9-6.9 kPa, the average pressure of the double-back pressure condenser is slightly lower than that of the single-back pressure condenser under the same cooling condition, and because the double-back pressure condenser introduces the condensed water on the low-back pressure side into the high-back pressure side through the communicating pipe 3 for heating (the condensed water temperature on the high-back pressure side is about 4.5 ℃ higher than the condensed water temperature on the low-back pressure side), the condensed water temperature is improved, the extraction quantity of the low-pressure heater is reduced, and the power generation heat consumption rate is reduced. The double back pressure unit is better than the past single back pressure unit in terms of operational economy benefits.
The conventional vacuumizing pipeline connection mode of the double-backpressure condenser generally adopts a serial arrangement mode, namely, two vacuumizing air pipes of the high-backpressure condenser enter the low-backpressure condenser and are connected with the vacuumizing pipeline of the low-backpressure condenser, and then the vacuumizing air pipes are connected to 3 water-ring-type vacuum pumps with 50% capacity through vacuumizing air female pipes. The evacuation pipelines in the series arrangement mode are mostly arranged inside the low-back-pressure condenser, and the pipeline arrangement after penetrating out of the low-back-pressure condenser is simpler. However, the connection mode has serious defects that air and a small amount of non-condensable gas flow from the high-back pressure condenser to the low-back pressure condenser by means of pressure difference, so that the pumping load of the low-back pressure condenser is increased, and the pumping of the low-back pressure condenser gas can be adversely affected; meanwhile, the cooling load of the low back pressure condenser is caused to squeeze the cooling of partial non-condensed gas in the low back pressure condenser, the heat exchange effect of the low back pressure condenser is weakened, and the vacuum and end difference cannot reach the design value. The result is that the pressure difference between the high back pressure condenser and the low back pressure condenser is far lower than 1kPa, the average pressure difference between the condenser ends is higher than 4.5 ℃, the operating pressures of the high back pressure condenser and the low back pressure condenser are very close, the pressure difference is only 0.1-0.3 kPa, and the double back pressure condenser loses the economical efficiency and the working characteristics of the design.
In order to improve the air pumping performance of the low back pressure condenser, although a throttling orifice plate with proper aperture is arranged on the air pumping pipeline of the high back pressure condenser to throttle the air (steam) mixture pumped by the high back pressure condenser, thereby reducing the pumping quantity of the air (steam) mixture pumped by the high back pressure condenser and improving the pumping of the accumulated air in the low back pressure condenser, test results show that the high back pressure condenser and the low back pressure condenser are in a serial arrangement mode, even if the throttling orifice plate is arranged on the vacuum pumping connecting pipe of the high back pressure condenser, the current limiting effect is limited, the air pumping in the low back pressure condenser is still blocked, and the operation pressure difference between the high back pressure condenser and the low back pressure condenser is 0.2-0.5 kPa, so that the problem of blocking the air pumping of the low back pressure condenser is fundamentally improved, the high back pressure condensing pressure and the low back pressure condensing pressure are increased to the design value (1-1.5 kPa), and the equipment reconstruction is necessary.
Disclosure of Invention
The utility model aims to solve the defects of the prior art and provide the efficient vacuumizing system of the double-backpressure condenser, which has the advantages of simple structure, electric energy saving, no blockage of air extraction and good air extraction performance.
The technical scheme adopted for solving the technical problems is as follows:
the high-efficiency vacuumizing system with the double back pressure condensers is provided with the low back pressure condenser and the high back pressure condenser, and the low back pressure condenser and the high back pressure condenser are communicated through a condensate communicating pipe.
The first vacuum tube, the second vacuum tube, the third vacuum tube and the fourth vacuum tube are sequentially provided with an air inlet manual valve, a check valve and an air inlet pneumatic control valve in the direction facing the vacuum pump.
The power of the vacuum pump connected with the first vacuum tube is 1.5 times of the power of the vacuum pump connected with the second vacuum tube, and the power of the vacuum pump connected with the fourth vacuum tube is 1.5 times of the power of the vacuum pump connected with the third vacuum tube.
The low back pressure condenser is connected with a circulating cooling water inlet pipe, and a circulating cooling water outlet pipe is connected with the high back pressure condenser.
The low-back-pressure air suction hole of the low-back-pressure condenser and the high-back-pressure air suction hole of the high-back-pressure condenser are respectively arranged at the throats of the low-back-pressure condenser and the high-back-pressure condenser, and the elevations of the low-back-pressure air suction hole of the low-back-pressure condenser and the high-back-pressure air suction hole of the high-back-pressure condenser are consistent.
The utility model discloses a condensate water communicating pipe provided with an anti-ventilation structure, which comprises a floating body, a guide rod and a guide cylinder, wherein the floating body is arranged in the condensate water communicating pipe, the upper end of the floating body is connected with the guide rod, the lower end of the floating body is provided with a spherical upper end which is provided with a cylindrical structure, and the upper end of the floating body and the upper end of the guide rod extend into the guide cylinder connected with the condensate water communicating pipe.
By adopting the structure, the utility model has the advantages of simple structure, electric energy saving, unhindered air extraction, good air extraction performance and the like.
Drawings
Fig. 1 is a schematic structural view of the present utility model.
Fig. 2 is a diagram showing a connection relationship between the ventilation preventing structure and the condensate communication pipe in the present utility model.
Detailed Description
The utility model is further described below with reference to the accompanying drawings:
as shown in the drawing, a high-efficiency vacuum pumping system with double back pressure condensers is provided with a low back pressure condenser 1 and a high back pressure condenser 2, the low back pressure condenser 1 and the high back pressure condenser 2 are communicated through a condensate communicating pipe 3, and the high back pressure condenser is characterized in that two low back pressure pumping holes are formed in the low back pressure condenser 1, the low back pressure pumping holes are respectively connected with a low back pressure pumping parent pipe 6 through a first low pressure pumping pipe 4 and a second low pressure pumping pipe 5, two high back pressure pumping holes are formed in the high back pressure condenser 2, the two high back pressure pumping holes are respectively connected with a high back pressure pumping parent pipe 9 through a first high pressure pumping pipe 7 and a second high pressure pumping pipe 8, the first low pressure pumping pipe 4, the second low back pressure pumping pipe 5, the first high pressure pumping pipe 7 and the second high back pressure pumping pipe 8 are respectively provided with a manual isolation valve 10, the low back pressure pumping parent pipe 6 and the high back pressure pumping parent pipe 9 are respectively connected through a pumping pipe 11, the pumping parent pipe 11 is respectively connected with a vacuum pump 13, a vacuum ring 13, a vacuum pump 14 and a vacuum ring 13 are respectively arranged on the vacuum ring 13, the vacuum ring 13 and the vacuum ring 14 are respectively, and the vacuum ring vacuum pump 14 are respectively connected with the vacuum pump 14.
Further, an air inlet manual valve 16, a check valve 17 and an air inlet pneumatic control valve 18 are sequentially arranged on the first vacuum tube 12, the second vacuum tube 13, the third vacuum tube 14 and the fourth vacuum tube 15 towards the vacuum pump direction, and the air inlet manual valve 16 is used for corresponding vacuum pump maintenance isolation; the check valve 17 is automatically closed by the back pressure difference, and is used for preventing the operation of the vacuum pump to stop pumping air for the operation of the vacuum pump when one water ring vacuum pump is operated; the intake air valve 18 is used for remote operation of the vacuum pump to be quickly closed or opened.
Further, the power of the vacuum pump connected to the first vacuum tube 12 is 1.5 times that of the vacuum pump connected to the second vacuum tube 13, and the power of the vacuum pump connected to the fourth vacuum tube 15 is also 1.5 times that of the vacuum pump connected to the third vacuum tube 14.
Furthermore, the low back pressure condenser 1 is connected with a circulating cooling water inlet pipe 19, and a circulating cooling water outlet pipe 20 is connected with the high back pressure condenser 2.
Further, the low back pressure air suction hole of the low back pressure condenser 1 and the high back pressure air suction hole of the high back pressure condenser 2 are respectively arranged at the throats of the low back pressure condenser 1 and the high back pressure condenser 2, and the elevations of the low back pressure air suction hole of the low back pressure condenser 1 and the high back pressure air suction hole of the high back pressure condenser 2 are consistent.
Further, the condensate water communicating pipe 3 on be equipped with and prevent ventilation structure 24, prevent ventilation structure 24 include body 21, guide bar 22 and guide cylinder 23, body 21 establish in condensate water communicating pipe 3's inside, guide bar 22 is connected to body 21's upper end, body 21 lower extreme set up to spherical upper end and set up to the cylindricality structure, body 21's upper end and guide bar 22's upper end stretch into in the guide cylinder 23 that is connected with condensate water communicating pipe 3.
The circulating cooling water inlet pipe 19 (the circulating water inlet temperature is low) must be connected to the side of the low back pressure condenser 1, and the circulating water outlet pipe (the circulating water outlet temperature is 8-10 ℃ higher than the inlet water) must be connected to the side of the high back pressure condenser 2. In the reconstruction, the pressure difference between the Gao Beiya condenser 2 and the low back pressure condenser 1 is found to be not greatly changed, because the positions of the circulating cooling water inlet pipe and the circulating cooling water outlet pipe are reversed in the design or installation process of the unit.
After being modified by adopting a separate independent arrangement mode, the water ring type vacuum pump set can adopt the following operation mode and set corresponding operation control logic:
(1) Normal operation mode: the communication valve is closed, the water ring type vacuum pumps 7A and 7B independently pump air (one runs for standby) to the low back pressure condenser 1, and the water ring type vacuum pumps 7C and 7D (one runs for standby) independently pump air to the high back pressure condenser 2. The vacuum pumping systems of the high-back pressure condenser 1 and the low-back pressure condenser 1 are independent and do not interfere with each other, so that the 'displacement phenomenon' of two air exhaust pipelines is thoroughly eliminated, and double back pressures are naturally formed.
(2) The fault operation mode of the vacuum pump is as follows: when one operation vacuum pump (such as the vacuum pump A or C) fails, the standby pump B (or D) is automatically started, and at least one water ring type vacuum pump is used as a standby for the low back pressure condenser 1 and the high back pressure condenser 2, so that the reliability of the vacuumizing system is improved.
(3) The electricity-saving operation mode is as follows: in spring and autumn, the circulating cooling water is reduced along with the air temperature, so that the condenser has better vacuum. At the moment, the communication valve is opened, and the low back pressure condenser 1 can be operated by adopting the power water ring type vacuum pump 7A because the air pressure in the low back pressure condenser is lower; the other vacuum pumps 7B, 7C, 7D are all shut down, wherein the vacuum pump 7D serves as a backup pump for the 7A pump.
(4) The deep electricity-saving operation mode is as follows: in winter, the condenser has good vacuum because the circulating cooling water is very low. At the moment, the communication valve is opened, and the low back pressure condenser 1 has lower air pressure, so that the vacuum pump 7B with small power can be independently operated; the other vacuum pumps 7A, 7C, 7D are all shut down, wherein the vacuum pump 7C serves as a backup pump for the 7B pump.
The utility model has the beneficial effects that:
(1) In normal operation, the connecting valve 25 is closed, the air evacuation pipelines of the low back pressure condenser 1 and the high back pressure condenser 2 are not crossed, and the air evacuation pipelines are independent air evacuation systems. The phenomenon that high-pressure air from the high-back pressure condenser 2 is expelled from low-pressure air in the low-back pressure condenser 1 is thoroughly eliminated, and the condenser is restored to the double-back pressure energy-saving characteristic operation state. The operation data show that under the same conditions, the heat exchange effect of the low back pressure condenser 1 and the high back pressure condenser 2 is improved, and the heat efficiency of the unit is improved (the pressure difference between the high back pressure condenser 2 and the low back pressure condenser 1 is at least improved to more than 1.2kPa, the average back pressure of the high back pressure condenser and the low back pressure condenser is reduced by more than 0.6kPa, and the end difference of the condenser is reduced by more than 1.5 ℃).
(2) In spring and autumn, the low back pressure condenser 1 and the high back pressure condenser 2 are simultaneously evacuated by 1 high-power water ring type vacuum pump, so that electric energy is saved.
In winter, the low back pressure condenser 1 and the high back pressure condenser 2 are simultaneously vacuumized by 1 low-power vacuum pump, so that electricity is further saved.
(3) The manual isolation valves 10 are additionally arranged on the first high-pressure exhaust pipe 7 and the second high-pressure exhaust pipe 8, and the manual isolation valves 10 are additionally arranged on the first low-pressure exhaust pipe 4 and the second low-pressure exhaust pipe 5, so that the vacuumizing requirement during single-side isolation cleaning of the high-back-pressure condenser 2 and the low-back-pressure condenser 1 can be met.
(4) The air inlet pneumatic control valve 18 and the communication valve 25 are both pneumatic doors, so that automatic remote control is convenient, and the number of equipment spare parts can be reduced.
(5) The connecting valve 25 is simple to open and close, and the water ring type vacuum pumps 7A, 7B, 7C and 7D are all provided with the check valve 17 in front, so that when one or two vacuum pumps are operated, other off-operation vacuum pumps can not close the corresponding air inlet pneumatic control valves 18.
(6) The condensate water communicating pipe 3 is provided with an anti-ventilation structure 24, the anti-ventilation structure 24 comprises a floating body 21, a guide rod 22 and a guide cylinder 23, the floating body 21 is arranged in the condensate water communicating pipe 3, the upper end of the floating body 21 is connected with the guide rod 22, the lower end of the floating body 21 is arranged to be a cylindrical structure, the upper end of the floating body 21 and the upper end of the guide rod 22 extend into the guide cylinder 23 connected with the condensate water communicating pipe 3, ventilation between the low back pressure condenser 1 and the high back pressure condenser 2 can be avoided through floating of the floating body 21, and then vacuumizing effect of a vacuum pump is affected.
Due to the adoption of the structure, the air pump has the advantages of simple structure, electric energy saving, unhindered air pumping, good pumping performance and the like.
Claims (6)
1. The high-efficiency vacuumizing system with the double back pressure condensers is provided with the low back pressure condenser and the high back pressure condenser, and the low back pressure condenser and the high back pressure condenser are communicated through a condensate communicating pipe.
2. The efficient vacuumizing system of the double back pressure condenser of claim 1, wherein the first vacuum tube, the second vacuum tube, the third vacuum tube and the fourth vacuum tube are sequentially provided with an air inlet manual valve, a check valve and an air inlet pneumatic valve in the direction facing the vacuum pump.
3. The efficient vacuumizing system of the double backpressure condenser of claim 1, wherein the power of the vacuum pump connected to the first vacuum tube is 1.5 times that of the vacuum pump connected to the second vacuum tube; the power of the vacuum pump connected to the fourth vacuum tube is also 1.5 times that of the vacuum pump connected to the third vacuum tube.
4. The efficient vacuumizing system of the double-backpressure condenser of claim 1, wherein the low backpressure condenser is connected with a circulating cooling water inlet pipe, and a circulating cooling water outlet pipe is connected with the high backpressure condenser.
5. The efficient vacuumizing system of the double-backpressure condenser, as set forth in claim 1, wherein the low backpressure air-extracting hole of the low backpressure condenser and the high backpressure air-extracting hole of the high backpressure condenser are respectively arranged at the throats of the low backpressure condenser and the high backpressure condenser, and the elevations of the low backpressure air-extracting hole of the low backpressure condenser and the high backpressure air-extracting hole of the high backpressure condenser are identical.
6. The efficient vacuumizing system of the double-backpressure condenser of claim 1, wherein the condensate water communicating pipe is provided with an anti-ventilation structure, the anti-ventilation structure comprises a floating body, a guide rod and a guide cylinder, the floating body is arranged in the condensate water communicating pipe, the upper end of the floating body is connected with the guide rod, the lower end of the floating body is in a cylindrical structure, and the upper end of the floating body and the upper end of the guide rod extend into the guide cylinder connected with the condensate water communicating pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320591588.7U CN219390590U (en) | 2023-03-23 | 2023-03-23 | High-efficient vacuum pumping system of two backpressure condensers |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320591588.7U CN219390590U (en) | 2023-03-23 | 2023-03-23 | High-efficient vacuum pumping system of two backpressure condensers |
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| Publication Number | Publication Date |
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| CN219390590U true CN219390590U (en) | 2023-07-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202320591588.7U Active CN219390590U (en) | 2023-03-23 | 2023-03-23 | High-efficient vacuum pumping system of two backpressure condensers |
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| CN (1) | CN219390590U (en) |
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- 2023-03-23 CN CN202320591588.7U patent/CN219390590U/en active Active
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