CN218296803U - Vacuumizing system of double-backpressure condenser - Google Patents
Vacuumizing system of double-backpressure condenser Download PDFInfo
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- CN218296803U CN218296803U CN202221731870.2U CN202221731870U CN218296803U CN 218296803 U CN218296803 U CN 218296803U CN 202221731870 U CN202221731870 U CN 202221731870U CN 218296803 U CN218296803 U CN 218296803U
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Abstract
The utility model discloses a two backpressure condenser evacuation systems, two backpressure condensers are including the low pressure condenser that is provided with the circulating water inlet and the high pressure condenser that is provided with the circulating water delivery port, evacuation system includes main vacuum pump, first reserve vacuum pump, the reserve vacuum pump of second, cooler and auto-change over device. The cooling of cooler and under the execution mode of auto-change over device, two backpressure condenser evacuation system operation modes are nimble, can enough be through only operating the main vacuum pump maintains high pressure condenser with the low pressure condenser is with high low back pressure operation, have saved two backpressure condenser evacuation system's operation and maintenance cost when having improved the vacuum pump reliability, also can be in when the main vacuum pump breaks down the concurrent operation first standby vacuum pump and second standby vacuum pump maintain high pressure condenser with the low pressure condenser is with high low back pressure operation.
Description
Technical Field
The utility model relates to a vacuum pump technical field especially relates to an evacuation system of two backpressure condensers.
Background
The production process of the thermal power plant is a production flow for sequentially converting chemical energy of coal into heat energy, mechanical energy and electric energy, wherein a steam turbine generator unit realizes conversion of the heat energy into the mechanical energy by virtue of a thermodynamic cycle device by virtue of the fact that water has a phase change characteristic of mutual conversion between a vapor state and a liquid state. The existing high-parameter high-capacity steam turbine generator unit with the power of 600MW or more generally adopts a four-steam-exhaust structure (two low-pressure cylinders and two condensers), circulating cooling water is used as a cooling medium of the condenser, the temperature of the condenser on the water inlet side of the circulating water is 5-8 ℃ lower than that of the condenser on the water outlet side of the circulating water due to the arrangement of the circulating water and the water inlet mode, and the back pressure difference of the condenser is 2-4 kPa. In order to improve the safety and the economical efficiency of the turbo generator unit, a vacuumizing system of a double-backpressure condenser is required to extract non-condensable gas in the condenser.
As shown in fig. 1, in a vacuum pumping system of a dual back pressure condenser in the prior art, the dual back pressure condenser includes a low pressure condenser 10 provided with a circulating water inlet and a high pressure condenser 20 provided with a circulating water outlet, the vacuum pumping system includes a first vacuum pump a, a second vacuum pump B and a third vacuum pump C, a first branch pipeline D1, a second branch pipeline D2, a third branch pipeline D3, a first pneumatic valve Q1, a second pneumatic valve Q2, a third pneumatic valve Q3, a first main pipeline E, a second main pipeline F, a first vacuum connection valve K1, a second vacuum connection valve K2, a first valve M1 and a second valve M2.
In the vacuum pumping system of the existing double-backpressure condenser, if the vacuum pumping system is in a working state, the first valve M1 and the second valve M2 are in a normally open state.
When the steam turbine generator unit is started to operate, the first vacuum interconnection gate K1, the second vacuum interconnection gate K2, the first pneumatic gate Q1, the second pneumatic gate Q2 and the third pneumatic gate Q3 are opened, and the first vacuum pump A, the second vacuum pump B and the third vacuum pump C are operated to establish the vacuum of the high-pressure condenser 20 and the vacuum of the low-pressure condenser 10.
When the steam turbine set normally operates, the following operation modes are mainly adopted: and closing the second pneumatic door Q2, stopping operating the second vacuum pump B for standby, closing the first vacuum connection door K1 or the second vacuum connection door K2, operating the first vacuum pump A to pump out the non-condensed gas in the high-pressure condenser 20 through the first main pipeline E and the first branch pipeline D1 in sequence, and operating the third vacuum pump C to pump out the non-condensed gas in the low-pressure condenser 10 through the second main pipeline F and the third branch pipeline D3 in sequence.
When the first vacuum pump a fails, the second vacuum pump B is started to pump out the noncondensable gas in the high-pressure condenser 20 through the first main pipeline E and the second branch pipeline D2 in sequence, or when the third vacuum pump C fails, the second vacuum pump B is started to pump out the noncondensable gas in the low-pressure condenser 10 through the second main pipeline F and the second branch pipeline D2 in sequence.
When the vacuum pumping system of the double-backpressure condenser works, three vacuum pumps run in a mode of two-running and one-standby, in order to maintain the high and low backpressure of the condenser, the double vacuum pumps must be started to run to respectively pump out non-condensed gas in the high-pressure condenser and the low-pressure condenser, because of the running of the double vacuum pumps, the actual non-condensed gas amount in the condenser is very small, and extremely high vacuum is formed at the inlet of the vacuum pump, so that cooling water in the vacuum pump is vaporized and condensed after acting on the cooling water to form cavitation, the cracks of an impeller are increased due to the cavitation, the maintenance work of equipment is high, and the reliability of the vacuum pump is reduced; in addition, the economic cost of adopting the double vacuum pump to operate is higher.
SUMMERY OF THE UTILITY MODEL
In view of the deficiencies in the prior art, the utility model provides a two backpressure condenser vacuum pumping systems to solve current two backpressure condenser vacuum pumping systems and need move the problem of two vacuum pumps at the during operation.
In order to solve the problems, the utility model provides a double-backpressure condenser vacuum pumping system, which comprises a low-pressure condenser provided with a circulating water inlet and a high-pressure condenser provided with a circulating water outlet, wherein the vacuum pumping system comprises a main vacuum pump, a first standby vacuum pump, a second standby vacuum pump, a cooler and a switching device; wherein the content of the first and second substances,
two paths of mutually independent first medium passages and second medium passages are formed in the switching device, the input ends of the first medium passages are connected to the high-pressure condenser through a first main pipeline, the input ends of the second medium passages are connected to the low-pressure condenser through a second main pipeline, and the output ends of the first medium passages and the second medium passages are respectively connected to the main vacuum pump;
the first backup vacuum pump is connected to the first main line at a first connection point by a first branch line, and a first vacuum communication door is arranged on the first main line between the first connection point and the input end of the first medium passage; the second standby vacuum pump is connected to the second main pipeline at a second connection point through a second branch pipeline, and a second vacuum communication door is arranged on the second main pipeline between the second connection point and the input end of the second medium channel;
the cooler is disposed on the first main line and between the first connection point and the high-pressure condenser.
Preferably, a first pneumatic gate is arranged on the first branch pipeline between the first connection point and the first standby vacuum pump, and a second pneumatic gate is arranged on the second branch pipeline between the second connection point and the second standby vacuum pump.
Preferably, the first main pipeline is located the cooler with be provided with first valve between the high pressure condenser, the second main pipeline is located the second connection site with be provided with the second valve between the low pressure condenser.
Preferably, the circulating cooling water of the cooler and the circulating water of the double back pressure condenser are taken from the same water source.
Preferably, the main vacuum pump is a single-suction vacuum pump, and the output ends of the first medium passage and the second medium passage in the switching device are combined in the same output pipeline and connected to the suction inlet of the single-suction vacuum pump.
More preferably, the switching means comprises a first duct, a second duct and third and fourth ducts;
the first pipeline is provided with a first gate valve, the second pipeline and the third pipeline are respectively provided with a first check valve, the fourth pipeline is internally provided with a partition plate extending along the length direction of the fourth pipeline, the first end of the second pipeline and the first end of the third pipeline are respectively communicated to the first pipeline at two opposite sides of the first gate valve, the second ends of the second pipeline and the third pipeline are respectively communicated to the first end of the fourth pipeline at two opposite sides of the partition plate, when the first gate valve is closed and the first check valve is opened, one part of the first pipeline, one part of the second pipeline and one part of the fourth pipeline form the first medium passage, and the other part of the first pipeline, the other part of the third pipeline and the other part of the fourth pipeline form the second medium passage;
wherein one end of the first pipe is formed as an input end of the first medium passage, and the other end is formed as an input end of the second medium passage; the second end of the fourth pipe is formed as the combined output end of the first medium passage and the second medium passage and is connected to the suction port of the single suction vacuum pump.
Still preferably, the first gate valve is disposed in the middle of the first pipeline, the second pipeline and the third pipeline are symmetrically located on opposite sides of the first gate valve and are connected to the first pipeline, respectively, and the isolation plate is disposed in the middle of the fourth pipeline.
Preferably, the main vacuum pump is a double-suction vacuum pump, the output end of the first medium passage in the switching device is connected to the first suction port of the double-suction vacuum pump, and the output end of the second medium passage in the switching device is connected to the second suction port of the double-suction vacuum pump.
More preferably, the switching means comprises a fifth pipe, a sixth pipe and a seventh pipe;
a second gate valve is arranged on the fifth pipeline, a second check valve is respectively arranged on the sixth pipeline and the seventh pipeline, a first end of the sixth pipeline and a first end of the seventh pipeline are respectively communicated to the fifth pipeline at two opposite sides of the second gate valve, when the second gate valve is closed and the second check valve is opened, a part of the fifth pipeline and the sixth pipeline form the first medium passage, and the other part of the fifth pipeline and the seventh pipeline form the second medium passage;
wherein one end of the fifth pipe is formed as an input end of the first medium passage, and the other end is formed as an input end of the second medium passage; the second end of the sixth pipeline is formed that the output end of the first medium passage is connected to the first suction port of the double suction vacuum pump, and the second end of the seventh pipeline is formed that the output end of the second medium passage is connected to the second suction port of the double suction vacuum pump.
Still preferably, the second gate valve is disposed in a middle position of the fifth pipeline, and the sixth pipeline and the seventh pipeline are bilaterally symmetrically located on opposite sides of the second gate valve and are respectively connected to the fifth pipeline.
The embodiment of the utility model provides a two backpressure condenser evacuation systems, two backpressure condensers are including the low pressure condenser that is provided with the circulating water inlet and the high pressure condenser that is provided with the circulating water delivery port, evacuation system includes main vacuum pump, first reserve vacuum pump, the reserve vacuum pump of second, cooler and auto-change over device. The cooling of cooler and under the execution mode of auto-change over device, two backpressure condenser evacuation system operation modes are nimble, can enough be through only operating the main vacuum pump maintains high pressure condenser with the low pressure condenser is with high low back pressure operation, have saved two backpressure condenser evacuation system's operation and maintenance cost when having improved the vacuum pump reliability, also can be in when the main vacuum pump breaks down the concurrent operation first standby vacuum pump and second standby vacuum pump maintain high pressure condenser with the low pressure condenser is with high low back pressure operation.
Drawings
FIG. 1 is a schematic structural diagram of a double back pressure condenser vacuum pumping system in the prior art;
fig. 2 is a schematic structural view of a double back pressure condenser vacuum pumping system in the embodiment of the present invention;
fig. 3 is a schematic structural diagram of the switching device in an embodiment of the present invention in a closed state;
fig. 4 is a schematic structural diagram illustrating the switching device in an open state according to an embodiment of the present invention;
fig. 5 is a schematic structural view of a switching device in a closed state according to another embodiment of the present invention;
fig. 6 is a schematic structural diagram of a switching device in an open state according to another embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts all belong to the protection scope of the present invention.
In the description of the embodiments of the present invention, it should be noted that, if the terms "upper", "lower", "vertical", "horizontal", "inner", "outer", etc. indicate the directions or positional relationships based on the directions or positional relationships shown in the drawings, or the directions or positional relationships that the products of the present invention are placed as usual when used, it is only for the convenience of describing the present invention and simplifying the description, but it is not intended to indicate or suggest that the device or element indicated by the terms must have a specific direction, be constructed and operated in a specific direction, and therefore, should not be construed as limiting the present invention. Furthermore, the appearances of the terms "first," "second," and the like in the description of the present invention are only used for distinguishing between the descriptions and are not intended to indicate or imply relative importance.
In the description of the embodiments of the present invention, it should be further noted that unless otherwise explicitly specified or limited, the terms "disposed" and "connected" should be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
To two backpressure condenser evacuation system among the prior art need operate two vacuum pumps not enough at the during operation, the utility model provides an evacuation system of two backpressure condensers, the evacuation system during operation of two backpressure condensers can only operate a vacuum pump.
The utility model provides a vacuum pumping system of two backpressure condensers, refer to fig. 2, two backpressure condensers are including the low pressure condenser 10 that is provided with the circulating water inlet and the high pressure condenser 20 that is provided with the circulating water delivery port, vacuum pumping system includes main vacuum pump 1, first reserve vacuum pump 2, the reserve vacuum pump of second 3, cooler 4 and auto-change over device 5.
In a specific scheme, two mutually independent first medium passages 5a and two mutually independent second medium passages 5b are formed in the switching device 5, an input end of the first medium passage 5a is connected to the high-pressure condenser 20 through a first main pipe 6, an input end of the second medium passage 5b is connected to the low-pressure condenser 10 through a second main pipe 7, and output ends of the first medium passage 5a and the second medium passage 5b are respectively connected to the main vacuum pump 1.
In a specific embodiment, the first standby vacuum pump 2 is connected to the first main pipe 6 at a first connection point 61 via a first branch pipe 8, and a first vacuum connection door 62 is arranged on the first main pipe 6 between the first connection point 61 and the input end of the first medium path 5 a; the second standby vacuum pump 3 is connected to the second main line 7 at a second connection point 71 via a second branch line 9, and a second vacuum connection door 72 is provided on the second main line 7 between the second connection point 71 and the input end of the second medium path 5b.
In a specific embodiment, the cooler 4 is disposed on the first main pipeline 6 and is located between the first connection point 61 and the high-pressure condenser 20.
Specifically, the circulating cooling water of the cooler 4 and the circulating water of the double-backpressure condenser are taken from the same water source.
It is worth mentioning that, in the embodiment of the present invention, after the gas extracted from the high pressure condenser 20 is cooled by the cooler 4, the temperature of the gas is substantially the same as the temperature of the gas extracted from the low pressure condenser 10.
In the embodiment of the present invention, the vacuum pumping system of the dual back pressure condenser further comprises a first pneumatic valve 81, a second pneumatic valve 91, a first valve 63 and a second valve 73.
In particular, the first pneumatic door 81 is arranged on the first branch line 8 between the first connection point 61 and the first back-up vacuum pump 2.
In particular, the second pneumatic gate 91 is arranged on the second branch line 9 between the second connection point 71 and the second standby vacuum pump 3.
Specifically, the first valve 63 is disposed on the first main pipeline 6 and between the cooler 4 and the high-pressure condenser 20.
Specifically, the second valve 73 is disposed on the second main line 7 between the second connection point 71 and the low-pressure condenser 10.
It should be noted that, in the embodiment of the present invention, the main vacuum pump 1 may be a single-suction vacuum pump or a double-suction vacuum pump, and the structure of the switching device 5 is selected according to the number of the suction ports of the main vacuum pump 1.
In an embodiment of the present invention, the main vacuum pump 1 is a single-suction vacuum pump, and the output ends of the first medium passage 5a and the second medium passage 5b in the switching device 5 are combined in the same output pipeline to be connected to the suction inlet of the single-suction vacuum pump.
Specifically, when the main vacuum pump 1 is a single suction vacuum pump, referring to fig. 3 and 4, the switching device 5 includes a first pipe 51, a second pipe 52, a third pipe 53, and a fourth pipe 56; a first gate valve 54 is disposed on the first pipeline 51, first check valves 55 are disposed on the second pipeline 52 and the third pipeline 53, respectively, a partition plate 57 extending along a length direction of the fourth pipeline 56 is disposed in the fourth pipeline 56, a first end of the second pipeline 52 and a first end of the third pipeline 53 are communicated to the first pipeline 51 at opposite sides of the first gate valve 54, respectively, and second ends of the second pipeline 52 and the third pipeline 53 are communicated to a first end of the fourth pipeline 56 at opposite sides of the partition plate 57, respectively.
It should be noted that the embodiment of the present invention provides a first check valve 55, which can prevent the airflow from reversing, and only a medium passage from the first end of the second pipeline 52 to the second end of the second pipeline 52 exists in the second pipeline 52, and similarly, only a medium passage from one end of the third pipeline 53 of the second pipeline to the second end of the third pipeline 53 exists in the third pipeline 53.
Actually, as shown in fig. 3, when the switching device 5 is in a closed state, the first gate valve 54 is closed and the first check valve 55 is opened, and at this time, the medium passage of the first pipe 51 is interrupted, and the medium passages of the second pipe 52 and the third pipe 53 are allowed to flow, so that a part of the first pipe 51, a part of the second pipe 52 and a part of the fourth pipe 56 form the first medium passage 5a, and the other part of the first pipe 51, a part of the third pipe 53 and a part of the fourth pipe 56 form the second medium passage 5b.
Wherein one end of the first pipe 51 is formed as an input end of the first medium passage 5a, and the other end is formed as an input end of the second medium passage 5 b; a second end of the fourth duct 56 is formed as a combined output end of the first medium passage 5a and the second medium passage 5b, and is connected to a suction port of a single suction vacuum pump.
Further, as shown in fig. 4, when the switching device 5 is in the open state, the first gate valve 54 is opened and the first check valve 55 is closed, and at this time, the medium passage of the first pipe 51 is allowed to flow, and the medium passage of the second pipe 52 and the third pipe 53 is blocked, so that the medium can flow only through the first pipe 51, from the first end of the first pipe 51 to the second end of the first pipe 51, or from the second end of the first pipe 51 to the first end of the first pipe 51.
In the switching device 5 as shown in fig. 4, a first end of the first pipe 51 is connected to the first vacuum interconnection gate 62, and a second end of the first pipe 51 is connected to the second vacuum interconnection gate 72.
In the embodiment of the present invention, it is preferable that the gate valve 54 is disposed at a middle position of the first pipe 51, the second pipe 52 and the third pipe 53 are bilaterally symmetrically located at opposite sides of the gate valve 54 and are respectively connected to the first pipe 51, and the isolation plate 57 is disposed at a middle position of the fourth pipe 56. With this setting, when the switching device 5 is in the closed state, the first medium passage 5a and the second medium passage 5b are the same in size.
In another embodiment of the present invention, the main vacuum pump 1 is a double-suction vacuum pump, the output end of the first medium passage 5a in the switching device 5 is connected to the first suction port of the double-suction vacuum pump, and the output end of the second medium passage 5b in the switching device 5 is connected to the second suction port of the double-suction vacuum pump.
Specifically, when the main vacuum pump 1 is a double-suction vacuum pump, referring to fig. 5 and 6, the switching device 5 includes a fifth pipeline 501, a sixth pipeline 502, and a seventh pipeline 503; a second gate valve 504 is disposed on the fifth pipeline 501, a second check valve 505 is disposed on each of the sixth pipeline 502 and the seventh pipeline 503, and a first end of the sixth pipeline 502 and a first end of the seventh pipeline 503 are respectively communicated to the fifth pipeline 501 at two opposite sides of the second gate valve 504.
It should be noted that the check valve 55 provided in the embodiment of the present invention can prevent the airflow from reversing, and only a medium passage from the first end of the sixth pipeline 502 to the second end of the sixth pipeline 502 exists in the sixth pipeline 502, and similarly, only a medium passage from one end of the seventh pipeline 503 to the second end of the seventh pipeline 503 exists in the seventh pipeline 503.
In fact, as shown in fig. 5, when the switching device 5 is in the closed state, the second gate valve 504 is closed and the second check valve 505 is opened, the medium passage of the fifth pipe 501 is cut off, and the medium passages of the sixth pipe 502 and the seventh pipe 503 are allowed to flow, so that a part of the fifth pipe 501 and the sixth pipe 502 form the first medium passage 5a, and the other part of the fifth pipe 501 and the seventh pipe 503 form the second medium passage 5b.
Wherein one end of the fifth pipe 501 is formed as an input end of the first medium passage 5a, and the other end is formed as an input end of the second medium passage 5 b; a second end of the sixth pipe 502 is formed such that an output end of the first medium passage 5a is connected to a first suction port of the double suction vacuum pump, and a second end of the seventh pipe 503 is formed such that an output end of the second medium passage 5b is connected to a second suction port of the double suction vacuum pump.
Further, as the switching device 5 shown in fig. 6 is in the open state, the second gate valve 504 is opened, and the second check valve 505 is closed, at this time, the medium passage of the fifth pipe 501 is allowed to flow, and the medium passages of the sixth pipe 502 and the seventh pipe 503 are blocked, so that the medium can flow only through the fifth pipe 501, can flow from the first end of the fifth pipe 501 to the second end of the fifth pipe 501, and can also flow from the second end of the fifth pipe 501 to the first end of the fifth pipe 501.
In the switching device 5 as shown in fig. 6, a first end of the fifth pipe 501 is connected to the first vacuum interconnection gate 62, and a second end of the fifth pipe 501 is connected to the second vacuum interconnection gate 72.
In the embodiment of the present invention, it is preferable that the gate valve 504 is disposed in the middle of the fifth pipeline 501, and the sixth pipeline 502 and the seventh pipeline 503 are bilaterally symmetrically located on opposite sides of the gate valve 504 and are respectively connected to the fifth pipeline 501. With this setting, when the switching device 5 is in the closed state, the first medium passage 5a and the second medium passage 5b are the same size.
In fact, in the switching device 5 as shown in fig. 3, 4 or 5, 6, the first shutter 54 and the second shutter 504, and the second check valve 55 and the second check valve 505 may also be electrically connected to an actuating drive mechanism, automatically controlled such that when the first shutter 54 and the second shutter 504 are opened, the first check valve 55 and the second check valve 505 are closed; when the first shutter 54 and the second shutter 504 are closed, the first check valve 55 and the second check valve 505 are opened.
In addition, the switching device 5 can be manufactured on site according to the structural size of an inlet pipe of the vacuum pump and then put into a vacuum pumping system of the double-backpressure condenser for use, and can also be produced in batches according to the type of the vacuum pump.
In fact, when the vacuum pumping system of the dual back pressure condenser is in operation, the first valve 63 and the second valve 73 are normally open.
When the turbo generator set is started, in the vacuumizing system of the double-backpressure condenser, the first connecting valve 62, the second connecting valve 72, the first pneumatic valve 81, the second pneumatic valve 91 and the switching device 5 are opened, and the main vacuum pump 1, the first standby vacuum pump 2 and the second standby vacuum pump 3 establish the vacuum of the low-pressure condenser 10 and the vacuum of the high-pressure condenser 20.
And when the turboset normally operates, closing the first pneumatic valve 81, the second pneumatic valve 91 and the switching device 5, stopping operating the first standby vacuum pump 2 and the second standby vacuum pump 3, and operating the main vacuum pump 1. At this time, the main vacuum pump 1 extracts non-condensing gases from the high-pressure condenser 20 and the low-pressure condenser 10 to maintain the high-low back pressure operation of the condensers, which is specifically represented as: the main vacuum pump 1 pumps out noncondensable gas in the high-pressure condenser 20 through the first main line 6 and the first medium passage 5a, and simultaneously, the main vacuum pump 1 pumps out noncondensable gas in the low-pressure condenser 10 through the second main line 7 and the second medium passage 5b.
In fact, the formation of the high and low back pressure of the condenser is mainly determined by the mode and the temperature of the inlet water of the cooling circulating water. Because the cooling circulating water flows out after passing through the condenser on one side and then exchanging heat through the condenser on the other side, high and low back pressure is formed.
In the embodiment of the present invention, when the main vacuum pump 1 pumps out the noncondensable gas in the high-pressure condenser 20 and the low-pressure condenser 10, a part of the saturated steam is also pumped out.
The embodiment of the utility model provides an in, cooler 4 sets up on the first main line 6, cooler 4 recirculated cooling water with the circulating water of two backpressure condensers is got from the same water source, consequently, follows the gas process that high pressure condenser 20 was taken out the temperature behind cooler 4 is unanimous basically with the follow the temperature of the gas that low pressure condenser 10 was taken out, follows the gas pressure of taking out behind cooler 4 is unanimous basically with the follow the gas pressure of taking out low pressure condenser 10. Because the vacuum of the suction inlet of the main vacuum pump 1 is far higher than the vacuum in the high-pressure condenser 20 and the low-pressure condenser 10, and the first medium passage 5a and the second medium passage 5b are independent from each other and are respectively connected to the main vacuum pump 1, the gas extracted from the high-pressure condenser 20 and the gas extracted from the low-pressure condenser 10 are pumped away by the main vacuum pump without medium exchange, so that two air flows enter the vacuum pump independently without being squeezed by each other, and the operation of the condenser at high and low back pressures is maintained by a single vacuum pump.
According to dalton's law, the pressure in the condenser is equal to the sum of the partial pressures of the gases, which is mainly the sum of the partial pressure of saturated steam at the exhaust temperature and the partial pressure of the non-condensable gases (mainly air). Taking a certain 600MW unit as an example, the rated output of a vacuum pump is 75kg/h, and the volume of a condenser in operation is 1360m 3 And on the left and right, the condenser vacuum tightness meets the standard requirement of being not more than 0.27kPa/min, the condenser is qualified, the non-condensed gas is measured according to air, other factors are not changed when the unit is in operation, the vacuum is reduced due to the fact that the air leaking into the non-condensed gas is leaked, if the vacuum is reduced by 0.27kPa/min, in order to maintain the vacuum, the air quantity which needs to be pumped away is about 23kg/h and is less than the rated output of a vacuum pump by 75kg/h. That is to say, when the condenser vacuum is maintained in the qualified range, only the main vacuum pump 1 is operated, and the requirement of the vacuumizing system of the double-backpressure condenser can be completely met.
It is worth mentioning that, under the condition that only the main vacuum pump 1 is operated, the non-condensed gas in the high-pressure condenser 20 and the low-pressure condenser 10 is extracted by the main vacuum pump 1, and the amount of the non-condensed gas in the main vacuum pump 1 is increased, so that when the output is ensured, the back pressure at the inlet of the vacuum pump is reduced, and the evaporation amount of the working water in the vacuum pump is reduced, thereby preventing the impeller from increasing the equipment maintenance workload due to the cracks caused by cavitation, improving the operation reliability of the vacuum pump, and saving the operation and maintenance costs of a double-back-pressure condenser vacuum-extraction system.
If the main vacuum pump 1 fails, the first vacuum interconnection door 62 or the second vacuum interconnection door 72 is closed, the first pneumatic door 81, the second pneumatic door 91 and the switching device 5 are opened, the first standby vacuum pump 2 is started and operated to pump out the non-condensed gas in the high-pressure condenser 20 through the first main pipeline 6 and the first branch pipeline 8 in sequence, and the second standby vacuum pump 3 is started and operated to pump out the non-condensed gas in the low-pressure condenser 10 through the second main pipeline 7 and the first branch pipeline 9 in sequence.
The embodiment of the utility model provides an in, through implementing as above the evacuation system of two back pressure condensers, at the evacuation system of two back pressure condensers during operation, three vacuum pumps are with the mode operation of "one fortune two is equipped with", take a certain 600MW unit as an example, vacuum pump power is 160kW, annual operation 5000 hours is calculated, than former system stoppage of operation one vacuum pump during the unit operation, can save the power consumption of mill and be 80 ten thousand degrees, save the charges of electricity about 30 ten thousand yuan.
To sum up, the utility model provides a two backpressure condenser evacuation systems, two backpressure condensers are including the low pressure condenser that is provided with the circulating water inlet and the high pressure condenser that is provided with the circulating water delivery port, evacuation system includes main vacuum pump, first reserve vacuum pump, the reserve vacuum pump of second, cooler and auto-change over device. The cooling of cooler and under the execution mode of auto-change over device, two backpressure condenser evacuation system operation modes are nimble, can enough be through only operating the main vacuum pump maintains high pressure condenser with the low pressure condenser is with high low back pressure operation, have saved two backpressure condenser evacuation system's operation and maintenance cost when having improved the vacuum pump reliability, also can be in when the main vacuum pump breaks down the concurrent operation first standby vacuum pump and second standby vacuum pump maintain high pressure condenser with the low pressure condenser is with high low back pressure operation.
The foregoing is directed to embodiments of the present application and it is noted that numerous modifications and adaptations may be made by those skilled in the art without departing from the principles of the present application and are intended to be within the scope of the present application.
Claims (10)
1. A vacuum pumping system of a double-backpressure condenser comprises a low-pressure condenser (10) provided with a circulating water inlet and a high-pressure condenser (20) provided with a circulating water outlet, and is characterized by comprising a main vacuum pump (1), a first standby vacuum pump (2), a second standby vacuum pump (3), a cooler (4) and a switching device (5); wherein the content of the first and second substances,
two independent first medium passages (5 a) and two independent second medium passages (5 b) are formed in the switching device (5), the input ends of the first medium passages (5 a) are connected to the high-pressure condenser (20) through a first main pipeline (6), the input ends of the second medium passages (5 b) are connected to the low-pressure condenser (10) through a second main pipeline (7), and the output ends of the first medium passages (5 a) and the second medium passages (5 b) are respectively connected to the main vacuum pump (1);
the first standby vacuum pump (2) is connected to the first main line (6) by means of a first branch line (8) at a first connection point (61), a first vacuum interconnection door (62) being arranged on the first main line (6) between the first connection point (61) and the input of the first medium duct (5 a); the second standby vacuum pump (3) is connected to the second main pipe (7) at a second connection point (71) by a second branch pipe (9), and a second vacuum connection door (72) is arranged on the second main pipe (7) between the second connection point (71) and the input end of the second medium passage (5 b);
the cooler (4) is arranged on the first main line (6) and is located between the first connection point (61) and the high-pressure condenser (20).
2. The evacuation system of a double back pressure condenser according to claim 1, characterized in that a first pneumatic gate (81) is arranged on the first branch pipe (8) between the first connection point (61) and the first back-up vacuum pump (2), and a second pneumatic gate (91) is arranged on the second branch pipe (9) between the second connection point (71) and the second back-up vacuum pump (3).
3. The evacuation system of a dual back pressure condenser according to claim 1, characterized in that a first valve (63) is arranged on the first main line (6) between the cooler (4) and the high pressure condenser (20), and a second valve (73) is arranged on the second main line (7) between the second connection point (71) and the low pressure condenser (10).
4. The evacuation system of a double back pressure condenser according to claim 1, wherein the circulating cooling water of the cooler (4) and the circulating water of the double back pressure condenser are taken from the same water source.
5. The vacuum pumping system of the double back pressure condenser according to any one of claims 1 to 4, wherein the main vacuum pump (1) is a single suction vacuum pump, and the output ends of the first medium passage (5 a) and the second medium passage (5 b) in the switching device (5) are merged in the same output pipeline and connected to the suction port of the single suction vacuum pump.
6. The vacuum pumping system of a double back pressure condenser according to claim 5, characterized in that the switching device (5) comprises a first pipe (51), a second pipe (52), a third pipe (53) and a fourth pipe (56);
a first gate valve (54) is arranged on the first pipe (51), a first check valve (55) is arranged on each of the second pipe (52) and the third pipe (53), a partition plate (57) extending along the length direction of the fourth pipe (56) is arranged in the fourth pipe (56), a first end of the second pipe (52) and a first end of the third pipe (53) are communicated with the first pipe (51) at opposite sides of the first gate valve (54), respectively, a second end of the second pipe (52) and a second end of the third pipe (53) are communicated with a first end of the fourth pipe (56) at opposite sides of the partition plate (57), respectively, when the first gate valve (54) is closed and the first check valve (55) is opened, a part of the first pipe (51), the second pipe (52) and a part of the fourth pipe (56) form the first medium passage (5 a), and another part of the first pipe (51), the third pipe (53) and the fourth pipe (56) form the other medium passage (5 b);
wherein one end of the first conduit (51) is formed as an input of the first medium passage (5 a) and the other end is formed as an input of the second medium passage (5 b); the second end of the fourth duct (56) is formed as a combined output end of the first medium passage (5 a) and the second medium passage (5 b) and is connected to a suction port of a single suction vacuum pump.
7. The vacuum pumping system of the double back pressure condenser according to claim 6, wherein the first gate valve (54) is disposed at a middle position of the first pipe (51), the second pipe (52) and the third pipe (53) are bilaterally symmetrically disposed at opposite sides of the first gate valve (54) and are respectively connected to the first pipe (51), and the partition plate (57) is disposed at a middle position of the fourth pipe (56).
8. The vacuum pumping system of a double back pressure condenser according to any one of claims 1 to 4, wherein the main vacuum pump (1) is a double suction vacuum pump, an output end of the first medium passage (5 a) in the switching device (5) is connected to a first suction port of the double suction vacuum pump, and an output end of the second medium passage (5 b) in the switching device (5) is connected to a second suction port of the double suction vacuum pump.
9. The evacuation system of a dual back pressure condenser according to claim 8, characterized in that the switching device (5) comprises a fifth conduit (501), a sixth conduit (502) and a seventh conduit (503);
a second gate valve (504) is arranged on the fifth pipeline (501), a second check valve (505) is respectively arranged on the sixth pipeline (502) and the seventh pipeline (503), a first end of the sixth pipeline (502) and a first end of the seventh pipeline (503) are respectively communicated with the fifth pipeline (501) at two opposite sides of the second gate valve (504), when the second gate valve (504) is closed and the second check valve (505) is opened, a part of the fifth pipeline (501) and the sixth pipeline (502) form the first medium passage (5 a), and the other part of the fifth pipeline (501) and the seventh pipeline (503) form the second medium passage (5 b);
wherein one end of the fifth pipe (501) is formed as an input end of the first medium passage (5 a) and the other end is formed as an input end of the second medium passage (5 b); the second end of the sixth pipe (502) is formed that the output end of the first medium passage (5 a) is connected to the first suction port of the double suction vacuum pump, and the second end of the seventh pipe (503) is formed that the output end of the second medium passage (5 b) is connected to the second suction port of the double suction vacuum pump.
10. The vacuum pumping system of the double back pressure condenser according to claim 9, wherein the second gate valve (504) is disposed at a middle position of the fifth pipeline (501), and the sixth pipeline (502) and the seventh pipeline (503) are bilaterally symmetrically disposed at opposite sides of the second gate valve (504) and are respectively connected to the fifth pipeline (501).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221731870.2U CN218296803U (en) | 2022-07-05 | 2022-07-05 | Vacuumizing system of double-backpressure condenser |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221731870.2U CN218296803U (en) | 2022-07-05 | 2022-07-05 | Vacuumizing system of double-backpressure condenser |
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| Publication Number | Publication Date |
|---|---|
| CN218296803U true CN218296803U (en) | 2023-01-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221731870.2U Active CN218296803U (en) | 2022-07-05 | 2022-07-05 | Vacuumizing system of double-backpressure condenser |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218296803U (en) |
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2022
- 2022-07-05 CN CN202221731870.2U patent/CN218296803U/en active Active
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