CN109713846B - Nuclear power station generator three-flow ring sealing oil system and air side sealing oil loop thereof - Google Patents
Nuclear power station generator three-flow ring sealing oil system and air side sealing oil loop thereof Download PDFInfo
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- CN109713846B CN109713846B CN201910025914.6A CN201910025914A CN109713846B CN 109713846 B CN109713846 B CN 109713846B CN 201910025914 A CN201910025914 A CN 201910025914A CN 109713846 B CN109713846 B CN 109713846B
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Abstract
The invention discloses a three-flow ring sealing oil system of a generator of a nuclear power station and an empty side sealing oil loop of the three-flow ring sealing oil system. The air side sealing oil circuit comprises: the main oil tank, the oil pump, the oil cooler, the filter, the check valve, the energy accumulator loop, the oil-hydrogen pressure difference regulating valve are arranged on the main pipeline and are sequentially connected in series along the flowing direction of the sealing oil in the main pipeline, at least one spare air side oil pump connected with the air side oil pump in parallel, the side pipeline, the pressure reducing valve arranged on the side pipeline and the oil-hydrogen pressure difference regulating valve are used for regulating the oil pressure of the sealing oil in the main pipeline of the air side sealing oil loop in a main pipeline regulating mode so as to maintain the oil pressure in the sealing bush of the generator to be higher than the hydrogen pressure in the generator. The three-flow ring sealing oil system provided by the invention solves the problem of variable working condition oil-hydrogen pressure difference fluctuation, and simultaneously solves the problem that the oil-hydrogen pressure difference is lower than 0 under the working condition of power failure accidents, thereby eliminating the hydrogen leakage hidden danger of the generator, and having great promotion effect on ensuring the safe, economical and stable operation of the unit.
Description
Technical Field
The invention relates to the technical field of nuclear power station debugging, in particular to a three-flow ring sealing oil system of a nuclear power station generator and an empty side sealing oil loop thereof.
Background
The generator sealing oil system supplies oil to the generator sealing tile, so that the oil pressure is higher than the hydrogen pressure in the generator, the hydrogen in the generator is prevented from leaking out along a gap between the rotating shaft and the sealing tile, and the hydrogen purity is prevented from being reduced because air enters the generator, and meanwhile, a large amount of oil is prevented from entering the generator because of overhigh oil pressure.
The three-flow ring seal oil system generally comprises: an air-side seal oil circuit, a hydrogen-side seal oil circuit, and a vacuum-side seal oil circuit. The air-side sealing oil loop generally comprises an air-side main oil tank, three air-side oil pumps, an oil cooler, a filter and two standby bypass oil-hydrogen differential pressure regulating valves. In order to ensure the reliability of the air side sealing oil loop, the air side sealing oil loop is provided with three redundant air side oil pumps which are mutually standby. In the normal operation process of the unit, a standby air-side oil pump in an air-side sealing oil loop needs to be started and stopped periodically to check the reliability of a standby pump. However, under the normal operation condition of the generator set, when a start-stop standby air side pump is periodically tested, the phenomenon that the pressure difference of oil and hydrogen greatly fluctuates and is lower than a trip value occurs.
In the prior art, the problem is solved by adopting a scheme of improving the response speed of the oil-hydrogen differential pressure valve, namely, the area of a diaphragm of the oil-hydrogen differential pressure valve in an air side sealing oil loop is increased. However, the response speed of the oil-hydrogen differential pressure valve cannot be infinitely increased, and too high response speed is not beneficial to stabilizing the oil-hydrogen differential pressure. Therefore, the air side sealing oil circuit needs to be redesigned to solve the above problems.
Disclosure of Invention
In order to solve the problems in the prior art, the embodiment of the invention provides a three-flow ring sealing oil system of a generator of a nuclear power station and an empty side sealing oil loop thereof. The technical scheme is as follows:
on one hand, the embodiment of the invention provides a three-flow ring sealing oil system of a generator of a nuclear power station, which comprises the following components: a hollow side sealing oil loop and a hydrogen side sealing oil loop which are connected with a sealing bush of a generator of the nuclear power station, and a vacuum side sealing oil loop which is respectively connected with the hollow side sealing oil loop and the hydrogen side sealing oil loop,
the air side sealing oil circuit comprises: a main pipeline communicated with a sealing bush of a generator of a nuclear power station, an empty side main oil tank, an empty side oil pump, an oil cooler, a filter, a check valve, an energy accumulator loop, an oil-hydrogen pressure difference regulating valve which are arranged on the main pipeline and are sequentially connected in series along the flowing direction of sealing oil in the main pipeline, at least one standby empty side oil pump connected with the empty side oil pump in parallel, a side pipeline communicated with the main pipeline, and a pressure reducing valve arranged on the side pipeline, wherein one end of the side pipeline is communicated with the empty side main oil tank, and the other end of the side pipeline is arranged between the oil cooler and the check valve,
the energy accumulator loop is used for maintaining the stability of the oil pressure in the main pipeline by storing or releasing sealing oil when the oil pressure in the main pipeline fluctuates due to various variable working conditions or accident working conditions;
the check valve is used for preventing sealing oil released by the energy accumulator loop from flowing back in the main pipeline;
the oil-hydrogen pressure difference regulating valve is used for regulating the oil pressure of the sealing oil in the main pipeline of the air side sealing oil loop in a main pipeline regulating mode so as to maintain the oil pressure in the sealing shoe of the generator to be higher than the hydrogen pressure in the generator;
the pressure reducing valve is used for maintaining the stability of the oil pressure in the main pipeline by adopting a bypass adjusting mode and guiding the sealing oil to flow back to the main oil tank at the empty side through the side pipeline when the oil pressure of the sealing oil in the main pipeline exceeds a preset threshold value.
In the three-flow-ring sealing oil system of the nuclear power plant generator according to the embodiment of the present invention, the spare air-side oil pump includes:
the emergency alternating-current sealing oil pump is used for standby starting to maintain the stability of oil pressure in the air side sealing oil loop when various variable working conditions occur;
the accident direct current sealing oil pump is used for standby starting when an accident occurs in the nuclear power station and the standby direct current power supply of the nuclear power station supplies power to maintain the stability of oil pressure in the empty side sealing oil loop.
In the three-flow-ring sealing oil system of the nuclear power plant generator according to the embodiment of the present invention, the air-side sealing oil loop further includes: at least one pressure transmitter is arranged on the base,
the pressure transmitter is arranged between the air side oil pump and the oil cooler and used for monitoring the oil pressure of the sealing oil in the main pipeline and sending corresponding start-stop control signals to any one or more of the air side oil pump, the emergency alternating current sealing oil pump and the accident direct current sealing oil pump according to the monitored oil pressure.
In the three-flow-ring sealing oil system of the nuclear power plant generator according to the embodiment of the present invention, the accumulator loop includes: the three accumulators are connected in parallel and used for maintaining the stability of the oil pressure in the main pipeline by storing or releasing sealing oil when the oil pressure in the main pipeline fluctuates due to various variable working conditions or accident working conditions.
In the three-flow-ring sealing oil system of the nuclear power plant generator according to the embodiment of the present invention, the air-side sealing oil loop further includes: a spare oil hydrogen pressure difference regulating valve connected with the oil hydrogen pressure difference regulating valve in parallel,
and the standby oil hydrogen pressure difference regulating valve is used for being standby mutually with the oil hydrogen pressure difference regulating valve so as to maintain that the oil pressure in the generator sealing tile is higher than the hydrogen pressure in the generator.
On the other hand, an embodiment of the present invention provides an empty-side sealing oil circuit of a three-flow-ring sealing oil system of a nuclear power plant generator, which is suitable for the three-flow-ring sealing oil system of the nuclear power plant generator, and the empty-side sealing oil circuit includes: a main pipeline communicated with a sealing bush of a generator of a nuclear power station, an empty side main oil tank, an empty side oil pump, an oil cooler, a filter, a check valve, an energy accumulator loop, an oil-hydrogen pressure difference regulating valve which are arranged on the main pipeline and are sequentially connected in series along the flowing direction of sealing oil in the main pipeline, at least one standby empty side oil pump connected with the empty side oil pump in parallel, a side pipeline communicated with the main pipeline, and a pressure reducing valve arranged on the side pipeline, wherein one end of the side pipeline is communicated with the empty side main oil tank, and the other end of the side pipeline is arranged between the oil cooler and the check valve,
the energy accumulator loop is used for maintaining the stability of the oil pressure in the main pipeline by storing or releasing sealing oil when the oil pressure in the main pipeline fluctuates due to various variable working conditions or accident working conditions;
the check valve is used for preventing sealing oil released by the energy accumulator loop from flowing back in the main pipeline;
the oil-hydrogen pressure difference regulating valve is used for regulating the oil pressure of the sealing oil in the main pipeline of the air side sealing oil loop in a main pipeline regulating mode so as to maintain the oil pressure in the sealing shoe of the generator to be higher than the hydrogen pressure in the generator;
the pressure reducing valve is used for maintaining the stability of the oil pressure in the main pipeline by adopting a bypass adjusting mode and guiding the sealing oil to flow back to the main oil tank at the empty side through the side pipeline when the oil pressure of the sealing oil in the main pipeline exceeds a preset threshold value.
In the above-described air side seal oil circuit according to the embodiment of the present invention, the backup air side oil pump includes:
the emergency alternating-current sealing oil pump is used for standby starting to maintain the stability of oil pressure in the air side sealing oil loop when various variable working conditions occur;
the accident direct current sealing oil pump is used for standby starting when an accident occurs in the nuclear power station and the standby direct current power supply of the nuclear power station supplies power to maintain the stability of oil pressure in the empty side sealing oil loop.
In the above-described air-side seal oil circuit according to the embodiment of the present invention, the oil circuit further includes: at least one pressure transmitter is arranged on the base,
the pressure transmitter is arranged between the air side oil pump and the oil cooler and used for monitoring the oil pressure of the sealing oil in the main pipeline and sending corresponding start-stop control signals to any one or more of the air side oil pump, the emergency alternating current sealing oil pump and the accident direct current sealing oil pump according to the monitored oil pressure.
In the above-described air-side sealing oil circuit according to an embodiment of the present invention, the accumulator circuit includes: the three accumulators are connected in parallel and used for maintaining the stability of the oil pressure in the main pipeline by storing or releasing sealing oil when the oil pressure in the main pipeline fluctuates due to various variable working conditions or accident working conditions.
In the above-described air-side seal oil circuit according to the embodiment of the present invention, the oil circuit further includes: a spare oil hydrogen pressure difference regulating valve connected with the oil hydrogen pressure difference regulating valve in parallel,
and the standby oil hydrogen pressure difference regulating valve is used for being standby mutually with the oil hydrogen pressure difference regulating valve so as to maintain that the oil pressure in the generator sealing tile is higher than the hydrogen pressure in the generator.
The technical scheme provided by the embodiment of the invention has the following beneficial effects:
through adjusting the oil hydrogen differential pressure governing valve to main road pipeline by the bypass pipeline in the sealed oil return circuit of air side, adopt the main road regulation mode promptly, make the aperture change of oil hydrogen differential pressure governing valve only need rely on the required flow change of sealed tile, and because the required flow of sealed tile is stable basically, the aperture of oil hydrogen differential pressure governing valve does not need to change, consequently, when opening and shutting variable working condition such as reserve air side oil pump, oil hydrogen differential pressure valve aperture does not need to change, as long as the main road pipeline in the sealed oil return circuit of air side has enough flow can guarantee the stability of system oil hydrogen differential pressure, can solve oil hydrogen differential pressure and appear undulant too big, the problem of machine tripping appears. In addition, when the oil pressure of the air side sealing oil loop is kept stable, an energy accumulator loop is adopted, and when the oil pressure in the main pipeline fluctuates due to various variable working conditions or accident working conditions, the stability of the oil pressure in the main pipeline is kept by storing or releasing sealing oil; meanwhile, a pressure reducing valve is adopted, when the oil pressure of the sealing oil in the main pipeline exceeds a preset threshold value, a bypass adjusting mode is adopted, and the sealing oil is guided to flow back to the main oil tank at the empty side through a side pipeline, so that the stability of the oil pressure in the main pipeline is maintained. In conclusion, the three-flow ring sealing oil system of the generator of the nuclear power station solves the problem of variable working condition oil-hydrogen pressure difference fluctuation, and simultaneously solves the problem that the oil-hydrogen pressure difference is lower than 0 when the power failure accident is in working condition, thereby eliminating the hidden danger of hydrogen leakage of the generator and having great promotion effect on ensuring safe, economical and stable operation of the unit.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a three-flow ring sealing oil system of a generator of a nuclear power plant according to a first embodiment of the present invention;
FIG. 2 is a schematic diagram of the difference of the oil-hydrogen pressure in the air-side sealing oil loop under variable working conditions according to a first embodiment of the present invention;
FIG. 3 is a schematic diagram of the difference of the oil-hydrogen pressure in the air-side sealing oil circuit under still another variable operating condition according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of the difference of the oil-hydrogen pressure in the air-side sealing oil circuit under still another variable operating condition according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a difference of oil-hydrogen pressure in the air-side sealing oil loop under the power switching test condition according to an embodiment of the present invention;
fig. 6 is a schematic diagram of the difference of the oil-hydrogen pressure in the air-side sealing oil circuit under still another variable operating condition according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Example one
The embodiment of the invention provides a three-flow-ring sealing oil system of a generator of a nuclear power station, and referring to fig. 1, the three-flow-ring sealing oil system can comprise: the system comprises an Air Side sealing oil loop (namely Air Side) and a Hydrogen Side sealing oil loop (namely Hydrogen Side) which are connected with a sealing bush of a generator of the nuclear power station, and a Vacuum Side sealing oil loop (namely Vacuum Side) which is respectively connected with the Air Side sealing oil loop and the Hydrogen Side sealing oil loop, wherein the Hydrogen Side sealing oil loop is also respectively connected with a driving end (DESIDE) and a non-driving end (NDE SIDE) of a bearing of the generator.
Wherein, referring to fig. 1, the air side sealing oil circuit may include: a main pipeline communicated with a sealing bush of a nuclear power plant generator, an empty side main oil tank (namely 1110BA in figure 1), an empty side oil pump (namely 2115PO in figure 1), an oil cooler (namely 2215RF in figure 1), a filter (namely 23315FI in figure 1), a check valve (namely 2330VH in figure 1), an accumulator loop, an oil-hydrogen pressure difference regulating valve, at least one spare empty side oil pump connected with the empty side oil pump in parallel, a side pipeline communicated with the main pipeline, and a pressure reducing valve (namely 2413VH in figure 1) arranged on the side pipeline, wherein one end of the side pipeline is communicated with the empty side main oil tank, and the other end of the side pipeline is arranged between the oil cooler and the check valve,
the empty side main oil tank is used for storing sealing oil in the empty side sealing oil loop;
the air side oil pump is used for providing required oil pressure for sealing oil in the air side sealing oil loop;
a spare idle side oil pump for providing a required oil pressure for the sealing oil in the idle side sealing oil circuit when the idle side oil pump cannot provide a sufficient oil pressure;
a filter for filtering the sealing oil in the air side sealing oil circuit;
the oil cooler is used for adjusting the temperature of the sealing oil in the air side sealing oil loop, taking away redundant heat carried by the sealing oil and avoiding influencing the heat dissipation of the generator;
the energy accumulator loop is used for maintaining the stability of the oil pressure in the main pipeline by storing or releasing sealing oil when the oil pressure in the main pipeline fluctuates due to various variable working conditions or accident working conditions;
the check valve is used for preventing sealing oil released by the energy accumulator loop from flowing back in the main pipeline;
and the oil-hydrogen pressure difference regulating valve is used for regulating the oil pressure of the sealing oil in the main pipeline of the air side sealing oil loop in a main pipeline regulating mode so as to maintain the oil pressure in the sealing shoe of the generator to be higher than the hydrogen pressure in the generator. The function of the sealing oil differential pressure regulating valve is to ensure that the pressure of the sealing oil is always higher than the hydrogen pressure in the generator by 0.05MPa, thereby ensuring that the hydrogen cannot leak. It is a piston cylinder, and the sealing oil pressure and hydrogen pressure are respectively introduced into the upper and lower chambers of the piston, but the hydrogen pressure is indirectly replaced by oil pressure. The pressure difference between the upper chamber and the lower chamber is adjusted by a tension spring, so that the pressure difference between the sealing oil and the hydrogen is indirectly maintained. The tension of the spring is changed, so that the magnitude of the oil-hydrogen differential pressure can be changed.
The pressure reducing valve is used for maintaining the stability of the oil pressure in the main pipeline by adopting a bypass adjusting mode and guiding the sealing oil to flow back to the main oil tank at the empty side through the side pipeline when the oil pressure of the sealing oil in the main pipeline exceeds a preset threshold value.
In the prior art, in order to prevent hydrogen from leaking to cause combustion explosion during the operation of a generator and maintain the purity and pressure of hydrogen in the generator unchanged, two sets of sealing shoes are respectively arranged at two ends of a generator shaft, and sealing oil with pressure higher than that of the hydrogen is supplied to the two ends of the generator shaft to form oil rings so as to seal the hydrogen in the generator and prevent the hydrogen from leaking outwards and prevent a large amount of oil from entering the generator due to overhigh oil pressure. In order to maintain the stability of the oil-hydrogen differential pressure between the seal oil in the seal shoe and the hydrogen in the generator, a three-flow ring seal oil system may be employed. In the prior art, under a variable working condition, for example, during a periodic test of starting and stopping a standby pump, the flow of the air-side sealing oil loop is doubled when the standby air-side oil pump (with constant volume pump flow) is started, and the flow required by a sealing shoe of a generator is unchanged, so that the opening of an oil-hydrogen pressure difference regulating valve mounted on a bypass is increased to drain the sealing oil back to an air-side main oil tank; when the spare air side oil pump of outage, the air side seal oil return circuit flow becomes original one-half, and at this moment, the oil hydrogen differential pressure regulating valve aperture of installing at the bypass by needs diminishes, satisfies sealed tile flow demand, and mechanical oil hydrogen differential pressure regulating valve action is untimely, can lead to the variable operating mode under the valve rod aperture can not in time adjust to new required aperture, and oil hydrogen differential pressure appears the fluctuation by a wide margin even machine tripping. This is determined by the mechanical characteristics of the oil-hydrogen differential pressure valve, and the improvement space is small.
In the present embodiment, in order to solve the above problem, a main path adjustment method is adopted in which the oil-hydrogen pressure difference adjustment valve is adjusted from the bypass path to the main path of the air-side sealed oil circuit. When the main path is adjusted, because the flow required by the sealing bush is basically stable, the opening of the oil-hydrogen differential pressure regulating valve does not need to be changed, and only the pressure and the flow in the front main pipe of the oil-hydrogen differential pressure valve are changed. Therefore, when the standby air side oil pump is started or stopped and other variable working conditions are met, the opening degree of the oil-hydrogen differential pressure valve does not need to be changed, the stability of the oil-hydrogen differential pressure of the system can be guaranteed as long as the main pipeline of the air side sealing oil loop has enough flow, and the problems that the oil-hydrogen differential pressure fluctuates too much and the trip occurs can be solved. In addition, when the oil pressure of the air side sealing oil loop is kept stable, an energy accumulator loop is adopted, and when the oil pressure in the main pipeline fluctuates due to various variable working conditions or accident working conditions, the stability of the oil pressure in the main pipeline is kept by storing or releasing sealing oil; meanwhile, a pressure reducing valve is adopted, when the oil pressure of the sealing oil in the main pipeline exceeds a preset threshold value, a bypass adjusting mode is adopted, and the sealing oil is guided to flow back to the main oil tank at the empty side through a side pipeline, so that the stability of the oil pressure in the main pipeline is maintained.
Alternatively, referring to fig. 1, the standby air side oil pump may include:
the emergency alternating-current sealing oil pump (such as 2125PO shown in figure 1) is used for standby starting to maintain the stability of the oil pressure in the air side sealing oil loop when various variable working conditions occur;
an emergency dc seal oil pump (2135 PO shown in fig. 1) is used for standby start-up to maintain stable oil pressure in the empty side seal oil circuit when a nuclear power plant has an accident and is powered by a standby dc power supply of the nuclear power plant.
In practical application, in order to ensure the reliability of the system, the air side sealing oil loop is provided with three redundant air side oil pumps which are mutually standby. In the normal operation process of the unit, the spare air side oil pump is started and stopped periodically to check the reliability of the spare air side oil pump.
Further, referring to fig. 1, the air side sealing oil circuit further includes: at least one pressure transmitter (e.g., 2144MP, 2150MP, as shown in FIG. 1).
And the pressure transmitter is arranged between the air side oil pump and the oil cooler and used for monitoring the oil pressure of the sealing oil in the main pipeline and sending corresponding start-stop control signals to any one or more of the air side oil pump, the emergency alternating current sealing oil pump and the accident direct current sealing oil pump according to the monitored oil pressure.
In this embodiment, the pressure transmitter is a device for converting pressure into pneumatic or electric signals for control and remote transmission, and can convert physical pressure parameters of gas, liquid and the like sensed by the load cell sensor into standard electric signals (such as 4-20 mADC and the like) to be supplied to secondary instruments such as an indication alarm, a recorder, a regulator and the like for measurement, indication and process regulation.
In this embodiment, the pressure transmitter measures the pressure before the oil-hydrogen differential pressure regulating valve, and if the pressure is lower than a certain value (e.g. 9bar), it is determined that the oil pump on the air side is failed, and the spare oil pump on the air side (e.g. 2125PO, 2135PO) is immediately activated. In addition, the condition that errors occur in data measurement can be effectively reduced by adopting a plurality of pressure transmitters.
Alternatively, referring to fig. 1, the accumulator circuit may comprise: the energy storage device comprises three energy storage devices (namely 2145AQ, 2155AQ and 2165AQ in fig. 1) which are connected in parallel, and the energy storage devices are used for maintaining the stability of the oil pressure in the main pipeline by storing or releasing sealing oil when the oil pressure in the main pipeline fluctuates due to various variable working conditions or accident working conditions.
In this embodiment, the accumulator is an energy storage device in a hydropneumatic system. The energy in the system is converted into compression energy or potential energy to be stored at a proper time, and when the system needs the energy, the compression energy or the potential energy is converted into hydraulic energy or air pressure and the like to be released, and the energy is supplied to the system again. When the system pressure is increased instantaneously, it can absorb the energy of the part to ensure the pressure of the whole system is normal.
In practical application, the energy accumulator is connected with an interface of the air side sealing oil loop, is arranged in front of the oil hydrogen differential pressure valve and behind the check valve, and is filled with oil by the sealing oil in the main pipeline of the air side sealing oil loop, so that the energy accumulator can immediately supplement the oil when the oil pressure in the main pipeline is reduced; the experiment shows that in order to maintain the oil-hydrogen pressure difference at the sealing tile at the rated hydrogen pressure working condition of the unit at the design value, the sealing oil pressure in the main pipeline of the air side sealing oil loop needs to be more than 8.6bar, and therefore the nitrogen pressure in the energy accumulator is set to be 8.6 bar. Thus, when the system operates normally, the accumulator is filled with 8.6bar of nitrogen, and the oil pressure is 10 bar.
Optionally, referring to fig. 1, the air side sealing oil circuit further includes: a spare oil hydrogen pressure difference regulating valve connected with the oil hydrogen pressure difference regulating valve in parallel,
and the standby oil hydrogen pressure difference regulating valve is used for being standby mutually with the oil hydrogen pressure difference regulating valve so as to maintain that the oil pressure in the generator sealing tile is higher than the hydrogen pressure in the generator.
In this embodiment, two oil-hydrogen pressure difference adjusting valves (2435 VH and 2445VH in fig. 1) that are backup to each other are changed to the outlet position of the main pipe of the air-side sealing oil circuit, and the oil pressure of the sealing oil in the main pipe of the air-side sealing oil circuit is adjusted by adopting a main pipe adjusting mode, so as to maintain the oil pressure in the sealing shoe of the generator higher than the hydrogen pressure in the generator. In practice, 2435VH may be set at 800mbar and 2445VH may be set at 600 mbar.
In addition, it should be noted that, in the three-flow ring sealing oil system, with respect to the improvement of the empty side sealing oil circuit, the other two sealing oil circuits (i.e., the hydrogen side sealing oil circuit and the vacuum side sealing oil circuit) are not affected, and the overall design of the three-flow ring sealing oil system is not affected, specifically:
the influence of the transformation of the air side sealing oil loop on the vacuum side sealing oil loop is analyzed as follows: 1. the air side sealing oil loop is used for supplementing oil to a vacuum oil tank of the vacuum side sealing oil loop, and the function is not influenced after the vacuum side sealing oil loop is modified; 2. the vacuum side sealing oil loop and the empty side sealing oil loop are ensured to have the oil pressure higher than that of the empty side sealing oil loop by a pressure regulating check valve (namely 3112VH in figure 1) by 0.2bar, the partial pipelines are arranged at the downstream of the main pipeline reconstruction pipeline, the check valve (namely 2330VH in figure 1) is arranged on the empty side sealing oil loop of the three-flow ring sealing oil system, and the oil in the vacuum side sealing oil loop cannot flow to the upstream of the main pipeline, so that the oil in the vacuum side sealing oil loop cannot influence the flow.
The influence of the transformation of the air side sealing oil loop on the hydrogen side sealing oil loop is analyzed as follows: the main pipeline of the air side sealing oil loop is not directly connected with the hydrogen side sealing oil loop, oil returned by the air side sealing oil loop is filled into the hydrogen side oil pipe in the starting stage of the three-flow ring sealing oil system, and the hydrogen side sealing oil loop operates independently after the hydrogen side sealing oil loop is started, so that no influence is caused.
With reference to fig. 2-6, the three-flow ring sealing oil system of the nuclear power plant generator is described below, wherein under the variable working condition test conditions of atmospheric pressure in the generator, the rated hydrogen pressure (6bar) in the generator, the turbine generator rotor being stationary, the turning state of the turbine generator rotor (8.3rpm), the rated rotation speed of the turbine generator rotor (1500rpm), the loss of the hydrogen side loop, the loss of the vacuum side loop, the switching of the plant power supply to the auxiliary power supply, and the switching of the auxiliary power supply to the diesel power supply, the change of the oil-hydrogen pressure difference in the air side sealing oil loop is performed:
fig. 2 shows the change of the oil-hydrogen pressure difference when starting and stopping a spare air-side oil pump in the air-side sealed oil loop, and it can be seen that the oil-hydrogen pressure difference is only reduced by 130mbar and is not lower than the trip value of 200 mbar.
Fig. 3 shows the change of the oil-hydrogen pressure difference when the two spare air-side oil pumps are started and stopped in the air-side sealing oil loop, and it can be seen that the oil-hydrogen pressure difference is only reduced by 130mbar and is not lower than the trip value of 200mbar at this time.
Fig. 4 shows the change of the oil-hydrogen pressure difference when the air-side oil pump is stopped and two spare air-side oil pumps are started simultaneously in the air-side sealed oil loop, and it can be seen that the oil-hydrogen pressure difference is only reduced by 80mbar and is not lower than the trip value of 200mbar at this time.
Fig. 5 shows that in the empty-side sealed oil loop, a power switching test is performed (i.e., when the ac power of the nuclear power plant is lost, the emergency dc sealed oil pump is started by the standby dc power), and at this time, the oil-hydrogen pressure difference is only reduced by about 60mbar and is not lower than the trip value of 200 mbar. Meanwhile, the condition that the pressure difference of oil hydrogen is lower than 0mbar can not occur.
FIG. 6 shows that under the working conditions of the rated hydrogen pressure and the rated rotational speed (1500rpm) of the generator, the air side oil pump 2115PO is shut down, and the emergency AC sealing oil pump 2125PO and the accident DC sealing oil pump 2135PO are started; then the empty side oil pump 2115PO is started again, and the emergency alternating current sealing oil pump 2125PO and the accident direct current sealing oil pump 2135PO are stopped, wherein the oil hydrogen pressure difference fluctuation does not exceed 200 mbar.
In conclusion, the three-flow-ring sealing oil system provided by the invention solves the problem of fluctuation of the pressure difference of oil and hydrogen under variable working conditions, and also solves the problem that the pressure difference of oil and hydrogen is lower than 0 (the pressure difference of oil and hydrogen is lower than 0 mbar) under the working condition of power failure accidents, thereby eliminating the hidden danger of hydrogen leakage of a generator and having great promotion effect on ensuring safe, economical and stable operation of a unit.
In addition, an embodiment of the present invention further provides a dead side sealing oil loop of a three-flow ring sealing oil system of a generator of a nuclear power plant, which is suitable for the above three-flow ring sealing oil system of a generator of a nuclear power plant, and with reference to fig. 1, the method includes: the air side seal oil circuit may include: a main pipeline communicated with a sealing bush of a nuclear power plant generator, an empty side main oil tank (namely 1110BA in figure 1), an empty side oil pump (namely 2115PO in figure 1), an oil cooler (namely 2215RF in figure 1), a filter (namely 23315FI in figure 1), a check valve (namely 2330VH in figure 1), an accumulator loop, an oil-hydrogen pressure difference regulating valve, at least one spare empty side oil pump connected with the empty side oil pump in parallel, a side pipeline communicated with the main pipeline, and a pressure reducing valve (namely 2413VH in figure 1) arranged on the side pipeline, wherein one end of the side pipeline is communicated with the empty side main oil tank, and the other end of the side pipeline is arranged between the oil cooler and the check valve,
the empty side main oil tank is used for storing sealing oil in the empty side sealing oil loop;
the air side oil pump is used for providing required oil pressure for sealing oil in the air side sealing oil loop;
a spare idle side oil pump for providing a required oil pressure for the sealing oil in the idle side sealing oil circuit when the idle side oil pump cannot provide a sufficient oil pressure;
a filter for filtering the sealing oil in the air side sealing oil circuit;
the oil cooler is used for adjusting the temperature of the sealing oil in the air side sealing oil loop, taking away redundant heat carried by the sealing oil and avoiding influencing the heat dissipation of the generator;
the energy accumulator loop is used for maintaining the stability of the oil pressure in the main pipeline by storing or releasing sealing oil when the oil pressure in the main pipeline fluctuates due to various variable working conditions or accident working conditions;
the check valve is used for preventing sealing oil released by the energy accumulator loop from flowing back in the main pipeline;
and the oil-hydrogen pressure difference regulating valve is used for regulating the oil pressure of the sealing oil in the main pipeline of the air side sealing oil loop in a main pipeline regulating mode so as to maintain the oil pressure in the sealing shoe of the generator to be higher than the hydrogen pressure in the generator. The function of the sealing oil differential pressure regulating valve is to ensure that the pressure of the sealing oil is always higher than the hydrogen pressure in the generator by 0.05MPa, thereby ensuring that the hydrogen cannot leak. It is a piston cylinder, and the sealing oil pressure and hydrogen pressure are respectively introduced into the upper and lower chambers of the piston, but the hydrogen pressure is indirectly replaced by oil pressure. The pressure difference between the upper chamber and the lower chamber is adjusted by a tension spring, so that the pressure difference between the sealing oil and the hydrogen is indirectly maintained. The tension of the spring is changed, so that the magnitude of the oil-hydrogen differential pressure can be changed.
The pressure reducing valve is used for maintaining the stability of the oil pressure in the main pipeline by adopting a bypass adjusting mode and guiding the sealing oil to flow back to the main oil tank at the empty side through the side pipeline when the oil pressure of the sealing oil in the main pipeline exceeds a preset threshold value.
In the prior art, in order to prevent hydrogen from leaking to cause combustion explosion during the operation of a generator and maintain the purity and pressure of hydrogen in the generator unchanged, two sets of sealing shoes are respectively arranged at two ends of a generator shaft, and sealing oil with pressure higher than that of the hydrogen is supplied to the two ends of the generator shaft to form oil rings so as to seal the hydrogen in the generator and prevent the hydrogen from leaking outwards and prevent a large amount of oil from entering the generator due to overhigh oil pressure. In order to maintain the stability of the oil-hydrogen differential pressure between the seal oil in the seal shoe and the hydrogen in the generator, a three-flow ring seal oil system may be employed. In the prior art, under a variable working condition, for example, during a periodic test of starting and stopping a standby pump, the flow of the air-side sealing oil loop is doubled when the standby air-side oil pump (with constant volume pump flow) is started, and the flow required by a sealing shoe of a generator is unchanged, so that the opening of an oil-hydrogen pressure difference regulating valve mounted on a bypass is increased to drain the sealing oil back to an air-side main oil tank; when the spare air side oil pump of outage, the air side seal oil return circuit flow becomes original one-half, and at this moment, the oil hydrogen differential pressure regulating valve aperture of installing at the bypass by needs diminishes, satisfies sealed tile flow demand, and mechanical oil hydrogen differential pressure regulating valve action is untimely, can lead to the variable operating mode under the valve rod aperture can not in time adjust to new required aperture, and oil hydrogen differential pressure appears the fluctuation by a wide margin even machine tripping. This is determined by the mechanical characteristics of the oil-hydrogen differential pressure valve, and the improvement space is small.
In the present embodiment, in order to solve the above problem, a main path adjustment method is adopted in which the oil-hydrogen pressure difference adjustment valve is adjusted from the bypass path to the main path of the air-side sealed oil circuit. When the main path is adjusted, because the flow required by the sealing bush is basically stable, the opening of the oil-hydrogen differential pressure regulating valve does not need to be changed, and only the pressure and the flow in the front main pipe of the oil-hydrogen differential pressure valve are changed. Therefore, when the standby air side oil pump is started or stopped and other variable working conditions are met, the opening degree of the oil-hydrogen differential pressure valve does not need to be changed, the stability of the oil-hydrogen differential pressure of the system can be guaranteed as long as the main pipeline of the air side sealing oil loop has enough flow, and the problems that the oil-hydrogen differential pressure fluctuates too much and the trip occurs can be solved. In addition, when the oil pressure of the air side sealing oil loop is kept stable, an energy accumulator loop is adopted, and when the oil pressure in the main pipeline fluctuates due to various variable working conditions or accident working conditions, the stability of the oil pressure in the main pipeline is kept by storing or releasing sealing oil; meanwhile, a pressure reducing valve is adopted, when the oil pressure of the sealing oil in the main pipeline exceeds a preset threshold value, a bypass adjusting mode is adopted, and the sealing oil is guided to flow back to the main oil tank at the empty side through a side pipeline, so that the stability of the oil pressure in the main pipeline is maintained.
Alternatively, referring to fig. 1, the standby air side oil pump may include:
the emergency alternating-current sealing oil pump (such as 2125PO shown in figure 1) is used for standby starting to maintain the stability of the oil pressure in the air side sealing oil loop when various variable working conditions occur;
an emergency dc seal oil pump (2135 PO shown in fig. 1) is used for standby start-up to maintain stable oil pressure in the empty side seal oil circuit when a nuclear power plant has an accident and is powered by a standby dc power supply of the nuclear power plant.
In practical application, in order to ensure the reliability of the system, the air side sealing oil loop is provided with three redundant air side oil pumps which are mutually standby. In the normal operation process of the unit, the spare air side oil pump is started and stopped periodically to check the reliability of the spare air side oil pump.
Further, referring to fig. 1, the air side sealing oil circuit further includes: at least one pressure transmitter (e.g., 2144MP, 2150MP, as shown in FIG. 1).
And the pressure transmitter is arranged between the air side oil pump and the oil cooler and used for monitoring the oil pressure of the sealing oil in the main pipeline and sending corresponding start-stop control signals to any one or more of the air side oil pump, the emergency alternating current sealing oil pump and the accident direct current sealing oil pump according to the monitored oil pressure.
In this embodiment, the pressure transmitter is a device for converting pressure into pneumatic or electric signals for control and remote transmission, and can convert physical pressure parameters of gas, liquid and the like sensed by the load cell sensor into standard electric signals (such as 4-20 mADC and the like) to be supplied to secondary instruments such as an indication alarm, a recorder, a regulator and the like for measurement, indication and process regulation.
In this embodiment, the pressure transmitter measures the pressure before the oil-hydrogen differential pressure regulating valve, and if the pressure is lower than a certain value (e.g. 9bar), it is determined that the oil pump on the air side is failed, and the spare oil pump on the air side (e.g. 2125PO, 2135PO) is immediately activated. In addition, the condition that errors occur in data measurement can be effectively reduced by adopting a plurality of pressure transmitters.
Alternatively, referring to fig. 1, the accumulator circuit may comprise: the energy storage device comprises three energy storage devices (namely 2145AQ, 2155AQ and 2165AQ in fig. 1) which are connected in parallel, and the energy storage devices are used for maintaining the stability of the oil pressure in the main pipeline by storing or releasing sealing oil when the oil pressure in the main pipeline fluctuates due to various variable working conditions or accident working conditions.
In this embodiment, the accumulator is an energy storage device in a hydropneumatic system. The energy in the system is converted into compression energy or potential energy to be stored at a proper time, and when the system needs the energy, the compression energy or the potential energy is converted into hydraulic energy or air pressure and the like to be released, and the energy is supplied to the system again. When the system pressure is increased instantaneously, it can absorb the energy of the part to ensure the pressure of the whole system is normal.
In practical application, the energy accumulator is connected with an interface of the air side sealing oil loop, is arranged in front of the oil hydrogen differential pressure valve and behind the check valve, and is filled with oil by the sealing oil in the main pipeline of the air side sealing oil loop, so that the energy accumulator can immediately supplement the oil when the oil pressure in the main pipeline is reduced; the experiment shows that in order to maintain the oil-hydrogen pressure difference at the sealing tile at the rated hydrogen pressure working condition of the unit at the design value, the sealing oil pressure in the main pipeline of the air side sealing oil loop needs to be more than 8.6bar, and therefore the nitrogen pressure in the energy accumulator is set to be 8.6 bar. Thus, when the system operates normally, the accumulator is filled with 8.6bar of nitrogen, and the oil pressure is 10 bar.
Optionally, referring to fig. 1, the air side sealing oil circuit further includes: a spare oil hydrogen pressure difference regulating valve connected with the oil hydrogen pressure difference regulating valve in parallel,
and the standby oil hydrogen pressure difference regulating valve is used for being standby mutually with the oil hydrogen pressure difference regulating valve so as to maintain that the oil pressure in the generator sealing tile is higher than the hydrogen pressure in the generator.
In this embodiment, two oil-hydrogen pressure difference adjusting valves (2435 VH and 2445VH in fig. 1) that are backup to each other are changed to the outlet position of the main pipe of the air-side sealing oil circuit, and the oil pressure of the sealing oil in the main pipe of the air-side sealing oil circuit is adjusted by adopting a main pipe adjusting mode, so as to maintain the oil pressure in the sealing shoe of the generator higher than the hydrogen pressure in the generator. In practice, 2435VH may be set at 800mbar and 2445VH may be set at 600 mbar.
According to the embodiment of the invention, the oil-hydrogen pressure difference regulating valve is regulated to the main pipeline from the bypass pipeline of the air side sealing oil loop, namely, a main pipeline regulating mode is adopted, so that the opening change of the oil-hydrogen pressure difference regulating valve only depends on the flow change required by the sealing bush, and the opening of the oil-hydrogen pressure difference regulating valve does not need to change because the flow required by the sealing bush is basically stable, therefore, the opening of the oil-hydrogen pressure difference valve does not need to change when a standby air side oil pump and other variable working conditions are started and stopped, the stability of the system oil-hydrogen pressure difference can be ensured as long as the main pipeline of the air side sealing oil loop has enough flow, and the problems of overlarge fluctuation and machine jump of the oil-hydrogen pressure difference can be solved. In addition, when the oil pressure of the air side sealing oil loop is kept stable, an energy accumulator loop is adopted, and when the oil pressure in the main pipeline fluctuates due to various variable working conditions or accident working conditions, the stability of the oil pressure in the main pipeline is kept by storing or releasing sealing oil; meanwhile, a pressure reducing valve is adopted, when the oil pressure of the sealing oil in the main pipeline exceeds a preset threshold value, a bypass adjusting mode is adopted, and the sealing oil is guided to flow back to the main oil tank at the empty side through a side pipeline, so that the stability of the oil pressure in the main pipeline is maintained. In conclusion, the three-flow ring sealing oil system of the generator of the nuclear power station solves the problem of variable working condition oil-hydrogen pressure difference fluctuation, and simultaneously solves the problem that the oil-hydrogen pressure difference is lower than 0 when the power failure accident is in working condition, thereby eliminating the hidden danger of hydrogen leakage of the generator and having great promotion effect on ensuring safe, economical and stable operation of the unit.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (8)
1. A three-flow ring sealing oil system of a generator of a nuclear power station comprises: an air side sealing oil loop and a hydrogen side sealing oil loop which are connected with a sealing bush of a generator of the nuclear power station, and a vacuum side sealing oil loop which is respectively connected with the air side sealing oil loop and the hydrogen side sealing oil loop,
the air side sealing oil circuit comprises: a main pipeline communicated with a sealing bush of a generator of a nuclear power station, an empty side main oil tank, an empty side oil pump, an oil cooler, a filter, a check valve, an energy accumulator loop, an oil-hydrogen pressure difference regulating valve which are arranged on the main pipeline and are sequentially connected in series along the flowing direction of sealing oil in the main pipeline, at least one standby empty side oil pump connected with the empty side oil pump in parallel, a side pipeline communicated with the main pipeline, and a pressure reducing valve arranged on the side pipeline, wherein one end of the side pipeline is communicated with the empty side main oil tank, and the other end of the side pipeline is arranged between the oil cooler and the check valve,
the energy accumulator loop is used for maintaining the stability of the oil pressure in the main pipeline by storing or releasing sealing oil when the oil pressure in the main pipeline fluctuates due to various variable working conditions or accident working conditions;
the check valve is used for preventing sealing oil released by the energy accumulator loop from flowing back in the main pipeline;
the oil-hydrogen pressure difference regulating valve is used for regulating the oil pressure of the sealing oil in the main pipeline of the air side sealing oil loop in a main pipeline regulating mode so as to maintain the oil pressure in the sealing shoe of the generator to be higher than the hydrogen pressure in the generator;
the pressure reducing valve is used for maintaining the stability of the oil pressure in the main pipeline by guiding the sealing oil to flow back to the main oil tank at the empty side through the side pipeline in a bypass adjusting mode when the oil pressure of the sealing oil in the main pipeline exceeds a preset threshold value;
the spare air side oil pump includes:
the emergency alternating-current sealing oil pump is used for standby starting to maintain the stability of oil pressure in the air side sealing oil loop when various variable working conditions occur;
the accident direct current sealing oil pump is used for standby starting when an accident occurs in the nuclear power station and the standby direct current power supply of the nuclear power station supplies power to maintain the stability of oil pressure in the empty side sealing oil loop.
2. The nuclear power plant generator three-flow ring seal oil system as recited in claim 1, wherein the air side seal oil circuit further comprises: at least one pressure transmitter is arranged on the base,
the pressure transmitter is arranged between the air side oil pump and the oil cooler and used for monitoring the oil pressure of the sealing oil in the main pipeline and sending corresponding start-stop control signals to any one or more of the air side oil pump, the emergency alternating current sealing oil pump and the accident direct current sealing oil pump according to the monitored oil pressure.
3. The nuclear power plant generator three-flow ring seal oil system of claim 1, wherein the accumulator circuit comprises: the three accumulators are connected in parallel and used for maintaining the stability of the oil pressure in the main pipeline by storing or releasing sealing oil when the oil pressure in the main pipeline fluctuates due to various variable working conditions or accident working conditions.
4. The nuclear power plant generator three-flow ring seal oil system as recited in claim 1, wherein the air side seal oil circuit further comprises: a spare oil hydrogen pressure difference regulating valve connected with the oil hydrogen pressure difference regulating valve in parallel,
and the standby oil hydrogen pressure difference regulating valve is used for being standby mutually with the oil hydrogen pressure difference regulating valve so as to maintain that the oil pressure in the generator sealing tile is higher than the hydrogen pressure in the generator.
5. The utility model provides a nuclear power station generator three-flow ring seals oily loop of side seal of oil system which characterized in that, the sealed oily loop of side seal includes: a main pipeline communicated with a sealing bush of a generator of a nuclear power station, an empty side main oil tank, an empty side oil pump, an oil cooler, a filter, a check valve, an energy accumulator loop, an oil-hydrogen pressure difference regulating valve which are arranged on the main pipeline and are sequentially connected in series along the flowing direction of sealing oil in the main pipeline, at least one standby empty side oil pump connected with the empty side oil pump in parallel, a side pipeline communicated with the main pipeline, and a pressure reducing valve arranged on the side pipeline, wherein one end of the side pipeline is communicated with the empty side main oil tank, and the other end of the side pipeline is arranged between the oil cooler and the check valve,
the energy accumulator loop is used for maintaining the stability of the oil pressure in the main pipeline by storing or releasing sealing oil when the oil pressure in the main pipeline fluctuates due to various variable working conditions or accident working conditions;
the check valve is used for preventing sealing oil released by the energy accumulator loop from flowing back in the main pipeline;
the oil-hydrogen pressure difference regulating valve is used for regulating the oil pressure of the sealing oil in the main pipeline of the air side sealing oil loop in a main pipeline regulating mode so as to maintain the oil pressure in the sealing shoe of the generator to be higher than the hydrogen pressure in the generator;
the pressure reducing valve is used for maintaining the stability of the oil pressure in the main pipeline by guiding the sealing oil to flow back to the main oil tank at the empty side through the side pipeline in a bypass adjusting mode when the oil pressure of the sealing oil in the main pipeline exceeds a preset threshold value;
the spare air side oil pump includes:
the emergency alternating-current sealing oil pump is used for standby starting to maintain the stability of oil pressure in the air side sealing oil loop when various variable working conditions occur;
the accident direct current sealing oil pump is used for standby starting when an accident occurs in the nuclear power station and the standby direct current power supply of the nuclear power station supplies power to maintain the stability of oil pressure in the empty side sealing oil loop.
6. The air side seal oil circuit of claim 5, further comprising: at least one pressure transmitter is arranged on the base,
the pressure transmitter is arranged between the air side oil pump and the oil cooler and used for monitoring the oil pressure of the sealing oil in the main pipeline and sending corresponding start-stop control signals to any one or more of the air side oil pump, the emergency alternating current sealing oil pump and the accident direct current sealing oil pump according to the monitored oil pressure.
7. The air side seal oil circuit of claim 6 wherein the accumulator circuit comprises: the three accumulators are connected in parallel and used for maintaining the stability of the oil pressure in the main pipeline by storing or releasing sealing oil when the oil pressure in the main pipeline fluctuates due to various variable working conditions or accident working conditions.
8. The air side seal oil circuit of claim 6, further comprising: a spare oil hydrogen pressure difference regulating valve connected with the oil hydrogen pressure difference regulating valve in parallel,
and the standby oil hydrogen pressure difference regulating valve is used for being standby mutually with the oil hydrogen pressure difference regulating valve so as to maintain that the oil pressure in the generator sealing tile is higher than the hydrogen pressure in the generator.
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| CN201910025914.6A CN109713846B (en) | 2019-01-11 | 2019-01-11 | Nuclear power station generator three-flow ring sealing oil system and air side sealing oil loop thereof |
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| CN201910025914.6A CN109713846B (en) | 2019-01-11 | 2019-01-11 | Nuclear power station generator three-flow ring sealing oil system and air side sealing oil loop thereof |
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| US8838398B2 (en) * | 2010-03-17 | 2014-09-16 | General Electric Company | Turbine-generator hydrogen seal oil system diagnosis |
| CN203225616U (en) * | 2013-02-04 | 2013-10-02 | 哈尔滨电机厂有限责任公司 | 600MW nuclear power conventional island auxiliary generator seal oil system |
| JP2015056962A (en) * | 2013-09-11 | 2015-03-23 | 株式会社東芝 | Seal oil trap tank and hydrogen cooled type power generator system including the same |
| CN203770655U (en) * | 2014-02-10 | 2014-08-13 | 大唐珲春发电厂 | Uniflow ring sealing oil system |
| CN104196576B (en) * | 2014-09-01 | 2015-11-25 | 大唐保定热电厂 | Hydrogen-cooled steam turbine power generation group sealing oil system |
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