CN117516203A - Condenser back pressure maintaining system - Google Patents
Condenser back pressure maintaining system Download PDFInfo
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- CN117516203A CN117516203A CN202311416019.XA CN202311416019A CN117516203A CN 117516203 A CN117516203 A CN 117516203A CN 202311416019 A CN202311416019 A CN 202311416019A CN 117516203 A CN117516203 A CN 117516203A
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- 238000000034 method Methods 0.000 claims description 16
- 238000012423 maintenance Methods 0.000 claims description 12
- 230000001105 regulatory effect Effects 0.000 claims description 12
- 238000004891 communication Methods 0.000 claims description 7
- 230000001276 controlling effect Effects 0.000 claims description 4
- 238000011144 upstream manufacturing Methods 0.000 claims description 4
- 230000000903 blocking effect Effects 0.000 claims description 3
- 230000003247 decreasing effect Effects 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 4
- 230000002159 abnormal effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
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- 238000009825 accumulation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28B—STEAM OR VAPOUR CONDENSERS
- F28B9/00—Auxiliary systems, arrangements, or devices
- F28B9/10—Auxiliary systems, arrangements, or devices for extracting, cooling, and removing non-condensable gases
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28B—STEAM OR VAPOUR CONDENSERS
- F28B11/00—Controlling arrangements with features specially adapted for condensers
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Abstract
The invention discloses a condenser back pressure maintaining system, which comprises a double back pressure condenser, a connection switching device, a vacuum pump, a vacuum tank and a central controller, wherein the connection switching device comprises a first valve, a second valve, a three-way valve, two air inlets and three air outlets, the suction inlet of the vacuum pump is respectively connected to the three air outlets of the connection switching device, the air outlet of the condenser is connected to the air inlet of the connection switching device through a main way valve, before an air inlet valve is opened, the vacuum degree in the vacuum tank is higher than that of the condenser, an air outlet valve of the vacuum tank is connected to the air inlet of the connection switching device, and the air inlet valve of the vacuum tank is connected to the air outlet of the condenser. The system overcomes the problems that in the prior art, when the back pressure of the condenser is maintained, the starting speed of the vacuumizing system is low, the back pressure difference value is difficult to be effectively increased and decreased, the vacuum degree of the condenser cannot be guaranteed when the vacuum pump fails, and the like, can realize the quick starting of the condenser and the continuous and effective regulation and control of the back pressure difference value, and is efficient and reliable.
Description
Technical Field
The invention relates to the technical field of condenser vacuumizing, in particular to a condenser back pressure maintaining system.
Background
In a turbo generator set of a power plant, a condenser is an indispensable part, most of domestic power plants adopt double back pressure condensers, non-condensable gas permeates into a vacuum space of the condenser in the working process, the high back pressure and the low back pressure of the condenser can rise to influence the condensation effect, in order to ensure the high-performance operation of the condenser, the non-condensable gas needs to be timely extracted from the vacuum space, and the back pressure difference value of the high-pressure condenser and the low-pressure condenser is maintained in an effective range, so that the double back pressure condensers can exert the due operation advantages.
The method generally adopted at present is to use a three-vacuum pump vacuumizing mechanism with two operations and one standby, and the publication date is 2019, 03 and 29, and the name is a condenser vacuumizing system of a double-back-pressure turbo generator set and a control method thereof.
Disclosure of Invention
The invention solves the problems that the starting speed of a vacuum pumping system is low, the back pressure difference value is difficult to be effectively increased and decreased when the back pressure of a condenser is maintained in the prior art, the vacuum degree of the condenser cannot be ensured when a vacuum pump fails, and the like.
In order to achieve the above purpose, the present invention adopts the following scheme:
a condenser backpressure maintenance system, comprising:
the first connection switching device comprises a first valve, a second valve, a three-way valve, two air inlets and three air outlets, wherein the air inlets comprise a first air inlet and a second air inlet, the air outlets comprise a first air outlet, a second air outlet and a third air outlet, the first air outlet is connected to the first air inlet through the first valve, the second air outlet is connected to the second air inlet through the second valve, the three interfaces of the three-way valve are respectively connected with the first air inlet, the second air inlet and the third air outlet, and the second connection switching device has the same structure as the first connection switching device;
the number of the vacuum pumps is three, the suction inlets of the three vacuum pumps are respectively connected to the three air outlets of the first connection switching device, and the suction inlets of the three vacuum pumps are also respectively connected to the three air outlets of the second connection switching device;
the double back pressure condenser comprises a high pressure condenser positioned at the downstream of the circulating water channel and a low pressure condenser positioned at the upstream of the circulating water channel, wherein an exhaust port of the high pressure condenser is connected to a first air inlet of the first connection switching device through a first main channel valve, and an exhaust port of the low pressure condenser is connected to a second air inlet of the first connection switching device through a second main channel valve;
the first vacuum tank and the second vacuum tank respectively comprise an air outlet valve and an air inlet valve, the air outlet valve of the first vacuum tank is connected to the first air inlet of the second connection switching device, the air inlet valve of the first vacuum tank is connected to the air outlet of the high-pressure condenser, the air outlet valve of the second vacuum tank is connected to the second air inlet of the second connection switching device, the air inlet valve of the second vacuum tank is connected to the air outlet of the low-pressure condenser, and before the air inlet valve is opened, the vacuum degree in the first vacuum tank is higher than that in the high-pressure condenser, and the vacuum degree in the second vacuum tank is higher than that in the low-pressure condenser;
and the central controller is connected with and controls the opening and closing of all vacuum pumps and valves through the wireless communication module.
Preferably, the high-pressure condenser, the low-pressure condenser and the vacuum tank are all provided with internal pressure measuring devices, and the internal pressure measuring devices are used for measuring corresponding pressure values in real time and sending the pressure values to the central controller.
Preferably, the air inlet valve of the vacuum tank is a flow control valve, and the air inlet rate of the air inlet valve is regulated by a central controller.
Preferably, the system further comprises two special vacuum pumps, and the suction inlets of the two special vacuum pumps are respectively connected to the air outlet valves of the first vacuum tank and the second vacuum tank through control valves.
The application also provides a condenser back pressure maintaining method, based on the condenser back pressure maintaining system provided by any one of the schemes, the method comprises the following steps:
s1: opening air inlet valves of a first vacuum tank and a second vacuum tank, closing the air inlet valve of the first vacuum tank and opening a first main path valve when the internal pressure of the first vacuum tank is consistent with that of a high-pressure condenser, closing the air inlet valve of the second vacuum tank and opening a second main path valve when the internal pressure of the second vacuum tank is consistent with that of a low-pressure condenser, regulating all valves in a second connection switching device to be in a full blocking state, regulating all valves in the first connection switching device to be in a full communication state, and simultaneously opening three vacuum pumps;
s2: when the vacuum of the condenser reaches a stable working value, one of the vacuum pumps is closed as a standby, two air outlets connected with the two vacuum pumps which continue to run are respectively and correspondingly and independently communicated with the two air inlets one by adjusting the on-off of a valve in the first switching device, the suction inlet of the standby vacuum pump is communicated with the air outlet valve of the vacuum tank with the reduced vacuum degree by adjusting the valve in the second switching device, and the standby vacuum pump is started to vacuumize the vacuum tank to restore the vacuum degree to the value before the air inlet valve is opened;
s3: if one of the vacuum pumps which continuously operates at present fails, the vacuum pump is closed, if the vacuum pump is communicated with a first main valve before failure, an air inlet valve of a first vacuum tank is opened to maintain vacuum and back pressure in a high-pressure condenser, and if the vacuum pump is communicated with a second main valve before failure, an air inlet valve of a second vacuum tank is opened to maintain vacuum and back pressure in a low-pressure condenser; starting a standby vacuum pump, and adjusting a valve in a first connection switching device to enable two air outlets connected with two currently operated vacuum pumps to be respectively and independently communicated with two air inlets in a one-to-one correspondence manner;
s4: after the standby vacuum pump finishes starting normal work, opening a corresponding first main valve or second main valve and closing an air inlet valve of a corresponding vacuum tank;
s5: after the vacuum pump with faults is overhauled, the vacuum pump is communicated to an air outlet valve of a vacuum tank with the reduced vacuum degree by adjusting a valve in the second connection switching device, and the vacuum tank is vacuumized to restore the vacuum degree to a preset value.
Preferably, the air inlet valve of the vacuum tank is a flow control valve, the air inlet rate of the air inlet valve is regulated by the central controller, and the condenser back pressure maintaining method further comprises the following steps:
s6: the central controller obtains the real-time pressure in the high-pressure condenser and the low-pressure condenser through the internal pressure measuring device, compares the real-time pressure with the normal working pressure, opens the air inlet valve of the corresponding vacuum tank if the real-time pressure is higher than the normal working pressure, and reduces the internal pressure of the high-pressure condenser and the low-pressure condenser to the normal working pressure by controlling the air inlet rate of the air inlet valve.
Preferably, the condenser back pressure maintaining system further comprises two special vacuum pumps, wherein the suction inlets of the two special vacuum pumps are respectively connected to the air outlet valves of the first vacuum tank and the second vacuum tank through control valves, and before the vacuum pump with the fault is overhauled, the special vacuum pumps are used for vacuumizing the vacuum tank to enable the vacuum degree to be restored to the value before the air inlet valve is opened in the step S5.
The invention at least comprises the following beneficial effects: (1) When the condenser starts to start, the air in the condenser is quickly sucked away by opening the air inlet valve of the vacuum tank, so that the establishment of the vacuum of the condenser can be accelerated, and the starting speed of the condenser is greatly improved; (2) The back pressure of the condenser can be maintained in an effective interval by a vacuum tank during the operation interval of the vacuum pump; (3) The vacuum degree of the condenser can be maintained by the vacuum tank during the period that the standby vacuum pump is started when the vacuum pump fails until the standby vacuum pump operates normally; (4) When the two vacuum pumps are out of order, the vacuum degree dropping speed of the condenser can be slowed down by the vacuum tanks, so that enough time is provided for overhauling and replacing equipment; (5) By adopting the mode of matching the two connection switching devices, the standby vacuum pump can be used for vacuumizing the vacuum tank, and the utilization rate of the vacuum pump is improved.
Drawings
FIG. 1 is a schematic diagram of a back pressure maintenance system of a condenser according to the present invention;
fig. 2 is a schematic structural diagram of a connection switching device according to the present invention.
In the figure: the device comprises a first main path valve 1, a second main path valve 2, a first valve 3, a second valve 4, a three-way valve 5, a first air inlet 601, a second air inlet 602, a first air outlet 701, a second air outlet 702, a third air outlet 703, a special vacuum pump 8 and a vacuum pump 9.
Detailed Description
The present invention is described in further detail below with reference to the drawings to enable those skilled in the art to practice the invention by referring to the description.
It will be understood that terms, such as "having," "including," and "comprising," as used herein, do not preclude the presence or addition of one or more other elements or groups thereof.
It should be noted that the experimental methods described in the following embodiments, unless otherwise specified, are all conventional methods, and the materials, unless otherwise specified, are all commercially available; in the description of the present invention, it should be noted that, unless explicitly stated and limited otherwise, the terms "mounted," "connected," and "disposed" are to be construed broadly, and may be fixedly connected, disposed, or detachably connected, disposed, or integrally connected, disposed, for example. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art. The terms "transverse," "longitudinal," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used for convenience in describing and simplifying the description of the present invention based on the orientation or positional relationship shown in the drawings, and do not denote or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus are not to be construed as limiting the present invention.
As shown in fig. 1, the back pressure maintenance system for a condenser provided by the invention comprises:
the first connection switching device and the second connection switching device, the first connection switching device comprises a first valve 3, a second valve 4, a three-way valve 5, two air inlets and three air outlets, the air inlets comprise a first air inlet 601 and a second air inlet 602, the air outlets comprise a first air outlet 701, a second air outlet 702 and a third air outlet 703, the first air outlet 701 is connected to the first air inlet 601 through the first valve 3, the second air outlet 702 is connected to the second air inlet 602 through the second valve 4, the three interfaces of the three-way valve 5 are respectively connected with the first air inlet 601, the second air inlet 602 and the third air outlet 703, and the second connection switching device has the same structure as the first connection switching device; the three air outlets of the first connection switching device are respectively connected to the suction inlets of the three vacuum pumps 9, and in normal operation, two vacuum pumps 9 are in a working state and are used for pumping non-condensed gas in the condenser to maintain the vacuum degree in the condenser at a normal working value, and the other vacuum pump 9 is a standby vacuum pump 9. If the suction inlet of the standby vacuum pump 9 is connected to the first air outlet 701 of the first connection switching device, the first valve 3 is closed, the second valve 4 is opened, and the three-way joint is adjusted to enable the third air outlet 703 to be communicated with the first air inlet 601 but not the second air inlet 602; if the suction inlet of the standby vacuum pump 9 is connected to the second air outlet 702 of the first connection switching device, the second valve 4 is closed, the first valve 3 is opened, and the three-way joint is adjusted to enable the third air outlet 703 to be communicated with the second air inlet 602 but not the first air inlet 601; if the suction port of the standby vacuum pump 9 is connected to the third air outlet 703 of the first connection switching device, the first valve 3 and the second valve 4 are opened, and the three-way joint is adjusted to a state in which all three interfaces thereof are blocked. The three air outlets of the first connection switching device are respectively connected to the suction inlets of the three vacuum pumps 9, and in normal operation, if the suction inlet of the standby vacuum pump 9 is connected to the first air outlet 701, the first valve 3 is opened, the second valve 4 is closed, and the three-way joint is adjusted to enable the first air inlet 601 to be communicated with the second air inlet 602; if the suction inlet of the standby vacuum pump 9 is connected to the second air outlet 702, the second valve 4 is opened, the first valve 3 is closed, and the three-way joint is adjusted to enable the first air inlet 601 to be communicated with the second air inlet 602; if the suction port of the standby vacuum pump 9 is connected to the third air outlet 703, the first valve 3 and the second valve 4 are closed, and the three-way connector is adjusted so that the three connectors are all communicated with each other. The standby vacuum pump 9 and the operating vacuum pump 9 are judged based on the actual operating state of each vacuum pump 9 when the condenser is vacuumized normally, and each vacuum pump 9 is set to an initial state by the system and can be adjusted at any time by the central controller.
The number of the vacuum pumps 9 is three, the suction inlets of the three vacuum pumps 9 are respectively connected to the three air outlets of the first connection switching device, and the suction inlets of the three vacuum pumps 9 are also respectively connected to the three air outlets of the second connection switching device; the suction inlets of the three vacuum pumps 9 are respectively connected to the three air outlets of the first connection switching device, and are optionally communicated with the air outlets of the high-pressure condenser and the low-pressure condenser through the two air inlets of the first connection switching device, and the three vacuum pumps 9 can be used for vacuumizing the condenser in a two-operation one-standby mode and maintaining the stability of the high back pressure and the low back pressure of the double-back pressure condenser. The suction ports of the vacuum pumps 9 are also respectively connected to the three air outlets of the second connection switching device, and are optionally communicated with the air outlet valve of the first vacuum tank through the two air inlets of the second connection switching device, when the two vacuum pumps 9 are operated to vacuumize the condenser, the standby vacuum pump 9 can be started to vacuumize the vacuum tank to maintain the set value of the vacuum degree before the air inlet valve is opened, and the vacuum pump 9 is normally used for vacuuming the condenser without using the highest power, so that the vacuum degree in the vacuum tank can be pumped to be higher than that of the low-pressure condenser and the high-pressure condenser.
The double back pressure condenser comprises a high pressure condenser positioned at the downstream of the circulating water channel and a low pressure condenser positioned at the upstream of the circulating water channel, wherein an exhaust port of the high pressure condenser is connected to a first air inlet 601 of the first connection switching device through a first main channel valve 1, and an exhaust port of the low pressure condenser is connected to a second air inlet 602 of the first connection switching device through a second main channel valve 2; because the structural design of two backpressure condensers, at its during operation, circulating water heat transfer leads to the backpressure of the high, low pressure condenser that is in circulating water upstream and downstream to have certain difference, be maintaining the average backpressure of two backpressure condensers and high low back pressure difference in certain effective range can make its condensing effect because single backpressure condenser, high pressure condenser and low pressure condenser are respectively connected first main way valve 1 and second main way valve 2 the back and are respectively independently linked to different vacuum pumps 9 through the pipeline in the first connection auto-change over device again, thereby realize the independent evacuation of high pressure condenser and low pressure condenser, high low pressure both sides do not communicate, guaranteed the effective maintenance of high low back pressure difference.
The first vacuum tank and the second vacuum tank respectively comprise an air outlet valve and an air inlet valve, the air outlet valve of the first vacuum tank is connected to the first air inlet 601 of the second connection switching device, the air inlet valve of the first vacuum tank is connected to the air outlet of the high-pressure condenser, the air outlet valve of the second vacuum tank is connected to the second air inlet 602 of the second connection switching device, the air inlet valve of the second vacuum tank is connected to the air outlet of the low-pressure condenser, before the air inlet valve is opened, the vacuum degree in the first vacuum tank is higher than that in the high-pressure condenser, and the vacuum degree in the second vacuum tank is higher than that in the low-pressure condenser; the first vacuum tank and the second vacuum tank are vacuumized in advance, the pressure in the vacuum tank is respectively lower than the pressure in the high-pressure condenser and the low-pressure condenser when the air inlet valve is not opened, the pressure in the vacuum tank comprises an upper pressure limit and a lower pressure limit, the pressure is determined according to the space size in the vacuum tank, the vacuum space size of the condenser, the normal working backpressure of the condenser and the effective variation range of the backpressure, the pressure can be maintained at the lower pressure limit in a vacuumizing mode when the vacuum tank does not work, and the size of the internal space of the vacuum tank can be set to be larger than the vacuum space of the condenser so as to achieve a better vacuum maintaining effect; the back pressure of the condenser is basically separated from the normal range, namely, the pressure of the vacuum space is increased due to accumulation of non-condensed gas in the condenser, and when an air inlet valve of the vacuum tank is opened, part of the non-condensed gas in the condenser can be naturally sucked into the vacuum tank because the pressure in the vacuum tank is smaller than the pressure of the vacuum space of the condenser, so that the vacuum degree of the condenser is increased; the air outlet valve of the vacuum tank is communicated to the suction inlet of the standby vacuum pump 9 through the second connection switching device, when the air inlet valve of the vacuum tank is closed, if the pressure in the vacuum tank is higher than the set upper pressure limit, the air outlet valve is opened, the standby vacuum pump 9 is started to vacuumize, the pressure in the vacuum tank is restored to the lower pressure limit, and therefore the vacuum tank can be used for maintaining the vacuum of the condenser at any time.
And the central controller is connected with and controls the opening and closing of all the vacuum pumps 9 and valves through the wireless communication module. The central controller collects state data of the condenser, the vacuum pump 9 and the vacuum tank, and controls the opening and closing of the vacuum pump 9 and each valve according to the state data so as to achieve the effect of maintaining the back pressure of the condenser.
When the system operates, the main valve is closed and the air inlet valve of the vacuum tank is opened, when the internal pressure of the vacuum tank and the condenser is balanced, a large part of non-condensable gas initially existing in the condenser is extracted, at the moment, the air inlet valve of the vacuum tank is closed and the main valve is opened, all valves in the second connection switching device are kept in a non-communication state, all valves in the first connection switching device are adjusted to a full-open state, and simultaneously, three vacuum pumps 9 are opened to extract the residual non-condensable gas in the condenser so as to quickly establish vacuum. When the vacuum degree of the condenser reaches a stable working value, one of the vacuum pumps 9 is closed as a standby, the suction inlets of the two vacuum pumps 9 which continue to operate are communicated with the exhaust ports of the high-pressure condenser and the low-pressure condenser in a one-to-one correspondence and independent mode through adjusting the on-off of the valve in the first switching device, the high-pressure condenser and the low-pressure condenser independently adjust the back pressure through the two pipelines and the two vacuum pumps 9, the difference value between the high back pressure and the low back pressure is maintained in an effective range, the suction inlet of the standby vacuum pump 9 is communicated to the air outlet valve of the vacuum tank with the reduced vacuum degree through adjusting the valve in the second connection switching device, and the standby vacuum pump 9 is started to vacuumize the vacuum tank to restore the vacuum degree to a value before the air inlet valve is opened. In the continuous operation process of the system, if one of the vacuum pumps 9 which is continuously operated at present fails, closing the vacuum pump 9 and opening an air inlet valve of a corresponding vacuum tank to maintain the vacuum and the back pressure in the corresponding condenser; and starting the standby vacuum pumps 9, and adjusting valves in the first connection switching device to enable the suction inlets of the two vacuum pumps 9 which are currently operated to be communicated with the exhaust ports of the high-pressure condenser and the low-pressure condenser in a one-to-one correspondence mode, wherein the high-pressure condenser and the low-pressure condenser independently adjust back pressure through the two pipelines and the two vacuum pumps 9. After the standby vacuum pump 9 finishes starting normal work, the corresponding main way valve is opened, and the air inlet valve of the corresponding vacuum tank is closed, so that the device for maintaining the vacuum of the condenser is converted into the vacuum pump 9 from the vacuum tank, and smooth switching from the fault vacuum pump 9 to the standby vacuum pump 9 is realized. After the vacuum pump 9 with the fault is overhauled or replaced, the valve in the second connection switching device is adjusted to enable the vacuum pump 9 to be communicated with the air outlet valve of the vacuum tank with the reduced vacuum degree, the vacuum tank is vacuumized to enable the vacuum degree to be restored to the value before the air inlet valve is opened, and at the moment, the whole system is restored to the normal running state.
According to the back pressure maintenance system of the condenser, the air inlet valve of the vacuum tank is opened when the condenser starts to start to suck away air in the condenser, so that the establishment of the vacuum of the condenser can be accelerated, and the starting speed of the condenser is greatly improved. The use of a vacuum tank during the operational intervals of the vacuum pump 9 can maintain the back pressure of the condenser in the active interval. The vacuum tank can be used for maintaining the vacuum degree of the condenser until the standby vacuum pump 9 operates normally during the period that the standby vacuum pump 9 is started when the vacuum pump 9 fails, and the vacuum degree dropping speed of the condenser can be slowed down by the vacuum tank even if two vacuum pumps 9 fail, so that more time is provided for overhauling and replacing equipment. By adopting the mode of matching the two connection switching devices, the standby vacuum pump 9 can be used for vacuumizing the vacuum tank, and the utilization rate of the vacuum pump 9 is improved.
In another technical scheme, the high-pressure condenser, the low-pressure condenser and the vacuum tank are all provided with internal pressure measuring devices, and the internal pressure measuring devices are used for measuring corresponding pressure values in real time and sending the pressure values to the central controller. The internal pressure measuring device is arranged to acquire the internal pressure of the condenser and the vacuum tank in real time, and the central controller can accurately control the running state of each element according to the abnormal pressure data.
In another technical scheme, the air inlet valve of the vacuum tank is a flow control valve, and the air inlet rate of the air inlet valve is regulated by the central controller. The vacuum pump 9 can have certain interval time to the condenser evacuation, can be through adjusting the degree of opening of flow control valve with the vacuum tank continuously adjust the vacuum of condenser during this interval and make its backpressure maintain at effective interval.
In another technical scheme, the system further comprises two special vacuum pumps 8, and the suction inlets of the two special vacuum pumps 8 are respectively connected to the air outlet valves of the first vacuum tank and the second vacuum tank through control valves. By arranging two special vacuum pumps 8 to evacuate the first vacuum tank and the second vacuum tank respectively, after the vacuum pump 9 fails to switch the vacuum pump 9, the vacuum degree of the vacuum tank is maintained by the spare vacuum pump 9 which is not available before the failure vacuum pump 9 is overhauled and replaced, and at the moment, the vacuum tank can be quickly restored to a high vacuum state by evacuating the vacuum tank by using the special vacuum pump 8 without waiting for a new available spare vacuum pump 9.
The application also provides a condenser back pressure maintaining method, based on the condenser back pressure maintaining system provided by any one of the schemes, the method comprises the following steps:
s1: opening air inlet valves of a first vacuum tank and a second vacuum tank, closing the air inlet valve of the first vacuum tank and opening a first main path valve 1 when the internal pressure of the first vacuum tank is consistent with that of a high-pressure condenser, closing the air inlet valve of the second vacuum tank and opening a second main path valve 2 when the internal pressure of the second vacuum tank is consistent with that of a low-pressure condenser, regulating all valves in a second connection switching device to be in a full blocking state, regulating all valves in the first connection switching device to be in a full communication state, and simultaneously opening three vacuum pumps 9;
s2: when the vacuum of the condenser reaches a stable working value, one of the vacuum pumps 9 is closed as a standby, two air outlets connected with the two vacuum pumps 9 which continue to run are respectively and correspondingly and independently communicated with the two air inlets one by adjusting the on-off of a valve in the first switching device, the suction inlet of the standby vacuum pump 9 is communicated with an air outlet valve of a vacuum tank with the reduced vacuum degree by adjusting the valve in the second switching device, and the standby vacuum pump 9 is started to vacuumize the vacuum tank to restore the vacuum degree to a value before the air inlet valve is opened;
s3: if one of the vacuum pumps 9 which is continuously operated at present breaks down, the vacuum pump 9 is closed, if the vacuum pump 9 is communicated with the first main path valve 1 before the break down, an air inlet valve of the first vacuum tank is opened to maintain the vacuum and the back pressure in the high-pressure condenser, and if the vacuum pump 9 is communicated with the second main path valve 2 before the break down, an air inlet valve of the second vacuum tank is opened to maintain the vacuum and the back pressure in the low-pressure condenser; starting a standby vacuum pump 9, and adjusting a valve in a first connection switching device to enable two air outlets connected with the two vacuum pumps 9 which are currently operated to be respectively and independently communicated with the two air inlets in a one-to-one correspondence manner;
s4: after the standby vacuum pump 9 finishes starting normal work, opening the corresponding first main valve 1 or second main valve 2 and closing the air inlet valve of the corresponding vacuum tank;
s5: after the vacuum pump 9 with the fault is overhauled, the vacuum pump 9 is communicated to an air outlet valve of a vacuum tank with the reduced vacuum degree by adjusting a valve in the second connection switching device, and the vacuum tank is vacuumized to restore the vacuum degree to a value before an air inlet valve is opened.
According to the back pressure maintaining method for the condenser, the air inlet valve of the vacuum tank is opened when the condenser starts to start to suck the air in the condenser, so that the establishment of the vacuum of the condenser can be accelerated, and the starting speed of the condenser is greatly improved. Communicating the vacuum tank with the condenser during the operational intervals of the vacuum pump 9 can maintain the back pressure of the condenser in the effective interval. The vacuum level of the condenser is maintained by the vacuum tank during the start-up of the standby vacuum pump 9 when the vacuum pump 9 fails, the system can also operate normally during the start-up of the standby vacuum pump 9, and in the event of simultaneous failure of two vacuum pumps 9, which is relatively urgent in prior art solutions, by slowing down the condenser vacuum level down with the vacuum tank, more operating time is provided for maintenance and replacement of equipment. The vacuum pump 9 is used for directly maintaining the back pressure of the condenser and also is used for reserving a high vacuum space for vacuumizing the vacuum tank by controlling the on-off matching mode of the two valves connected with the switching device, so that the back pressure of the condenser is indirectly maintained, and the utilization rate of the vacuum pump 9 is improved.
In another technical scheme, the air inlet valve of the vacuum tank is a flow control valve, the air inlet rate of the air inlet valve is regulated by the central controller, and the condenser back pressure maintaining method further comprises the following steps:
s6: the central controller obtains the real-time pressure in the high-pressure condenser and the low-pressure condenser through the internal pressure measuring device, compares the real-time pressure with the normal working pressure, opens the air inlet valve of the corresponding vacuum tank if the real-time pressure is higher than the normal working pressure, and reduces the internal pressure of the high-pressure condenser and the low-pressure condenser to the normal working pressure by controlling the air inlet rate of the air inlet valve.
The central controller acquires the internal pressure of the condenser and the vacuum tank in real time through the set internal pressure measuring device, and accurately controls the running state of each element according to the pressure abnormal data, so that the back pressure of the condenser can be continuously adjusted to maintain the condenser in a high-efficiency working state.
In another technical scheme, the condenser back pressure maintaining system further comprises two special vacuum pumps 8, wherein the suction inlets of the two special vacuum pumps 8 are respectively connected to the air outlet valves of the first vacuum tank and the second vacuum tank through control valves, and before the vacuum pump 9 with the fault is overhauled in the step S5, the special vacuum pumps 8 are used for vacuumizing the vacuum tanks to enable the vacuum degree to be restored to a value before the air inlet valve is opened.
Through setting up two special vacuum pumps 8 and vacuumizing for first vacuum tank and second vacuum tank respectively, at any time for the vacuum tank evacuation makes its high vacuum state of recovering fast, improved the reliability that whole system is used for maintaining condenser backpressure.
The number of equipment and the scale of processing described herein are intended to simplify the description of the present invention. Applications, modifications and variations of the present invention will be readily apparent to those skilled in the art.
Although embodiments of the present invention have been disclosed above, it is not limited to the details and embodiments shown and described, it is well suited to various fields of use for which the invention would be readily apparent to those skilled in the art, and accordingly, the invention is not limited to the specific details and illustrations shown and described herein, without departing from the general concepts defined in the claims and their equivalents.
Claims (7)
1. Condenser backpressure maintenance system, its characterized in that includes:
the first connection switching device comprises a first valve, a second valve, a three-way valve, two air inlets and three air outlets, wherein the air inlets comprise a first air inlet and a second air inlet, the air outlets comprise a first air outlet, a second air outlet and a third air outlet, the first air outlet is connected to the first air inlet through the first valve, the second air outlet is connected to the second air inlet through the second valve, the three interfaces of the three-way valve are respectively connected with the first air inlet, the second air inlet and the third air outlet, and the second connection switching device has the same structure as the first connection switching device;
the number of the vacuum pumps is three, the suction inlets of the three vacuum pumps are respectively connected to the three air outlets of the first connection switching device, and the suction inlets of the three vacuum pumps are also respectively connected to the three air outlets of the second connection switching device;
the double back pressure condenser comprises a high pressure condenser positioned at the downstream of the circulating water channel and a low pressure condenser positioned at the upstream of the circulating water channel, wherein an exhaust port of the high pressure condenser is connected to a first air inlet of the first connection switching device through a first main channel valve, and an exhaust port of the low pressure condenser is connected to a second air inlet of the first connection switching device through a second main channel valve;
the first vacuum tank and the second vacuum tank respectively comprise an air outlet valve and an air inlet valve, the air outlet valve of the first vacuum tank is connected to the first air inlet of the second connection switching device, the air inlet valve of the first vacuum tank is connected to the air outlet of the high-pressure condenser, the air outlet valve of the second vacuum tank is connected to the second air inlet of the second connection switching device, the air inlet valve of the second vacuum tank is connected to the air outlet of the low-pressure condenser, and before the air inlet valve is opened, the vacuum degree in the first vacuum tank is higher than that in the high-pressure condenser, and the vacuum degree in the second vacuum tank is higher than that in the low-pressure condenser;
and the central controller is connected with and controls the opening and closing of all vacuum pumps and valves through the wireless communication module.
2. The condenser back pressure maintenance system according to claim 1, wherein the high pressure condenser, the low pressure condenser and the vacuum tank are each provided with an internal pressure measuring device for measuring a corresponding pressure value in real time and transmitting the measured pressure value to the central controller.
3. The condenser back pressure maintenance system according to claim 2, wherein the intake valve of the vacuum tank is a flow control valve, the intake rate of which is regulated by a central controller.
4. The condenser back pressure maintenance system according to claim 1, further comprising two dedicated vacuum pumps, the suction ports of the two dedicated vacuum pumps being connected to the outlet valves of the first and second vacuum tanks, respectively, through control valves.
5. A condenser back pressure maintenance method, characterized in that, based on the condenser back pressure maintenance system according to any one of claims 1 to 4, the method comprises the steps of:
s1: opening air inlet valves of a first vacuum tank and a second vacuum tank, closing the air inlet valve of the first vacuum tank and opening a first main path valve when the internal pressure of the first vacuum tank is consistent with that of a high-pressure condenser, closing the air inlet valve of the second vacuum tank and opening a second main path valve when the internal pressure of the second vacuum tank is consistent with that of a low-pressure condenser, regulating all valves in a second connection switching device to be in a full blocking state, regulating all valves in the first connection switching device to be in a full communication state, and simultaneously opening three vacuum pumps;
s2: when the vacuum of the condenser reaches a stable working value, one of the vacuum pumps is closed as a standby, two air outlets connected with the two vacuum pumps which continue to run are respectively and correspondingly and independently communicated with the two air inlets one by adjusting the on-off of a valve in the first switching device, the suction inlet of the standby vacuum pump is communicated with the air outlet valve of the vacuum tank with the reduced vacuum degree by adjusting the valve in the second switching device, and the standby vacuum pump is started to vacuumize the vacuum tank to restore the vacuum degree to the value before the air inlet valve is opened;
s3: if one of the vacuum pumps which continuously operates at present fails, the vacuum pump is closed, if the vacuum pump is communicated with a first main valve before failure, an air inlet valve of a first vacuum tank is opened to maintain vacuum and back pressure in a high-pressure condenser, and if the vacuum pump is communicated with a second main valve before failure, an air inlet valve of a second vacuum tank is opened to maintain vacuum and back pressure in a low-pressure condenser; starting a standby vacuum pump, and adjusting a valve in a first connection switching device to enable two air outlets connected with two currently operated vacuum pumps to be respectively and independently communicated with two air inlets in a one-to-one correspondence manner;
s4: after the standby vacuum pump finishes starting normal work, opening a corresponding first main valve or second main valve and closing an air inlet valve of a corresponding vacuum tank;
s5: after the vacuum pump with faults is overhauled, the vacuum pump is communicated to an air outlet valve of a vacuum tank with the reduced vacuum degree by adjusting a valve in the second connection switching device, and the vacuum tank is vacuumized to restore the vacuum degree to a preset value.
6. The method of maintaining back pressure of a condenser according to claim 5, wherein the air intake valve of the vacuum tank is a flow control valve, the air intake rate of which is regulated by a central controller, the method further comprising the steps of:
s6: the central controller obtains the real-time pressure in the high-pressure condenser and the low-pressure condenser through the internal pressure measuring device, compares the real-time pressure with the normal working pressure, opens the air inlet valve of the corresponding vacuum tank if the real-time pressure is higher than the normal working pressure, and reduces the internal pressure of the high-pressure condenser and the low-pressure condenser to the normal working pressure by controlling the air inlet rate of the air inlet valve.
7. The method according to claim 5, wherein the condenser back pressure maintaining system further comprises two dedicated vacuum pumps, the suction ports of the two dedicated vacuum pumps are respectively connected to the air outlet valves of the first vacuum tank and the second vacuum tank through control valves, and before the failed vacuum pump is overhauled, the dedicated vacuum pump is used for vacuumizing the vacuum tank to restore the vacuum degree to the value before the air inlet valve is opened in step S5.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311416019.XA CN117516203A (en) | 2023-10-30 | 2023-10-30 | Condenser back pressure maintaining system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311416019.XA CN117516203A (en) | 2023-10-30 | 2023-10-30 | Condenser back pressure maintaining system |
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| CN117516203A true CN117516203A (en) | 2024-02-06 |
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| CN202311416019.XA Pending CN117516203A (en) | 2023-10-30 | 2023-10-30 | Condenser back pressure maintaining system |
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| CN (1) | CN117516203A (en) |
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- 2023-10-30 CN CN202311416019.XA patent/CN117516203A/en active Pending
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