RU2784571C1 - Cooling system for pump unit bearings with self-cleaning filters - Google Patents

Abstract

FIELD: cooling systems.

SUBSTANCE: invention relates to cooling systems for bearings of pumping units and can be used, in particular, at thermal power plants (TPP) for cooling the bearings of circulation pumps and bearings of their electric motors. The pump unit bearing cooling system comprises a circulation pump, the inlet of which is connected to a cooling water supply pipeline, and the circulation pump outlet pipe is connected to a pressure pipeline, which is connected to at least two cooling water filtration pipelines, on the line of each of which a check valve is installed in series, the first stop valves, filter and second stop valves. Each of said cooling water filtration pipelines is connected to a distribution pipeline, on the line of which an auxiliary pump is installed. Wherein each filter contains a drain pipeline connected to it up to its filtering surface along the flow of water for cleaning the filtering surface, on the line of which a shut-off valve is installed. At the same time, a differential pressure gauge is installed on the line of each cooling water filtration pipeline between the filter inlet and outlet. At that, the distribution pipeline is connected to the cooling pipeline of the upper bearing of the electric motor of the circulation pump, on the line of which the first heat exchanger is installed, immersed in the first oil bath, connected to the first water drain pipeline; wherein the top bearing of the electric motor is placed inside the first oil tank. At that, the distribution pipeline is connected to the cooling pipeline of the lower bearing of the electric motor of the circulation pump, on the line of which the second heat exchanger is installed, immersed in the second oil bath, connected to the second water drain pipeline; moreover, the lower bearing of the electric motor is placed inside the second oil pan. In this case, the distribution pipeline is connected to the cooling pipeline of the upper bearing of the circulation pump, which is connected to the inlet to the housing of the upper bearing of the circulation pump. Moreover, the outlet from the housing of the upper bearing of the circulation pump is connected to the third water drain pipeline. At the same time, the distribution pipeline is also connected to each of at least two cooling water filtration pipelines by means of pipelines for filter cleaning, on the line of each of which a shut-off valve is installed, between the filter outlet and the shut-off valve installed after it.

EFFECT: increased reliability of the cooling system for bearings of pumping units.

1 cl, 2 dwg

Description

Technical field

The invention relates to cooling systems for bearings of pumping units and can be used, in particular, at thermal power plants (TPP) for cooling the bearings of circulation pumps and bearings of their electric motors.

State of the art

During the operation of high-capacity pumping units that transport raw water containing various bioorganisms and large suspended particles from a natural source of water supply, for example, a natural reservoir, problems may arise with auxiliary cooling systems for bearings of pumping units, which reduces the reliability of their operation and increases the risk of emergency shutdown.

Known as a prototype of the claimed invention is a water cooling system for bearings of auxiliary mechanisms and oil and gas coolers, containing a water intake line connected to a circulation conduit up to the condenser, in which, in order to increase reliability and efficiency, a water intake line with a pump is connected to the circulation conduit after the condenser (SU 334382 A1 , published: 03/30/1972 (hereinafter - [1])).

The main disadvantage of the system known from [1] is the absence of a water filtration device in the line of its supply to auxiliary mechanisms and oil and gas coolers, which can lead to contamination of the water supply line and, as a result, reduce the reliability of the operation of bearings of auxiliary mechanisms and oil and gas coolers.

Disclosure of invention

The task to be solved by the patented invention is to increase the reliability of the cooling system for the bearings of pumping units, and the technical results are to ensure the filtration of water supplied from a natural source of water supply to the cooling system of the bearings of the pumping units and to provide the possibility of alternate cleaning of filters installed on the water line supplied from a natural source of water supply to the cooling system of the bearings of pumping units, without stopping the cooling of the bearings.

The solution to this problem by achieving the specified technical results is ensured by the fact that the cooling system of the bearings of the pumping units contains a circulation pump, the inlet of which is connected to the cooling water supply pipeline, and the outlet pipe of the circulation pump is connected to the pressure pipeline, which is connected to at least two cooling water filtration pipelines. water, on the line of each of which a check valve, a first stop valve, a filter and a second stop valve are installed in series; wherein each of said cooling water filtration pipelines is connected to a distribution pipeline, on the line of which an auxiliary pump is installed; moreover, each filter contains attached to it up to its filtering surface in the direction of water flow drain pipeline for cleaning the filtering surface, on the line which is installed shutoff valves; at the same time, a differential pressure gauge is installed on the line of each cooling water filtration pipeline between the inlet and outlet of the filter;

wherein the distribution pipeline is connected to the cooling pipeline of the upper bearing of the electric motor of the circulation pump, on the line of which the first heat exchanger is installed, immersed in the first oil bath, connected to the first water drain pipeline; moreover, inside the first oil tank is the upper bearing of the electric motor;

wherein the distribution pipeline is connected to the cooling pipeline of the lower bearing of the electric motor of the circulation pump, on the line of which the second heat exchanger is installed, immersed in the second oil bath, connected to the second water drain pipeline; moreover, inside the second oil tank is the lower bearing of the electric motor;

wherein the distribution pipeline is connected to the cooling pipeline of the upper bearing of the circulation pump, which is connected to the inlet to the housing of the upper bearing of the circulation pump; moreover, the output from the upper bearing housing of the circulation pump is connected to the third water drain pipe;

wherein the distribution pipeline is also connected to each of at least two cooling water filtration pipelines by means of pipelines for filter cleaning, on the line of each of which a shut-off valve is installed, between the filter outlet and the shut-off valve installed after it.

The causal relationship between the essential features of the patented invention and the achieved technical results is as follows.

The presence in the cooling system of the bearings of the pumping units of at least two cooling water filtration pipelines, each of which is connected to a distribution pipeline connected to the cooling pipelines of the bearings of the pumping unit, ensures the filtration of water supplied from a natural source of water supply to the cooling system of the bearings of the pumping units, due to filters, installed on the line of cooling water filtration pipelines.

The possibility of alternate cleaning of filters installed on the lines of at least two cooling water filtration pipelines, without stopping the cooling of the bearings, is ensured by the possibility of closing the shut-off valves installed before and after the filter on the line of one of at least two cooling water filtration pipelines and return water to the filtering surface of the filter through one of the pipelines for filter cleaning connected to the distribution pipeline, and removal of debris from the filtering surface of the filter through one of the drain pipelines for cleaning the filtering surface, connected to the filter up to its filtering surface in the direction of the water flow, by opening the shutoff valves, installed on the pipeline line for cleaning the filter, and opening the shut-off valves on the drain pipeline line to clean the filter surface. In this case, the cooling water is supplied to the cooling system of the bearings of the pumping unit through another cooling water filtration pipeline by opening the shut-off valves installed on its line before and after the filter. Control of the degree of contamination of the filtering surface of the filters is controlled by the pressure drop readings on the differential pressure gauges installed on the line of each cooling water filtration pipeline between the filter inlet and outlet.

Brief description of the figures

In FIG. 1 shows the circulation pump OPV 5-110-KE in a longitudinal section along the axis of symmetry in the area of its outlet pipe with the pump shaft. In FIG. 2 shows a diagram of the cooling system for bearings of pumping units.

Description of the positions of the figures

1.1 - impeller;

1.2 - outlet pipe;

1.3 - supporting part;

1.4 - lower bearing of the circulation pump;

1.5 - fairing;

1.6 - pump shaft;

1.7 - shaft flange;

1.8 - gland seal;

1.9 - diffuser;

1.10 - impeller chamber;

1.11 - mortgage foundation ring;

1.12 - foundation bolts;

1.13 - upper pump bearing; 2.1 - cooling water supply;

2.2 - outlet pipe of the circulation pump;

2.3 - the first cooling water filtration pipeline;

2.4 - second cooling water filtration pipeline;

2.5, 2.6 - check valves;

2.7, 2.8 - shutoff valves;

2.9 - the first filter;

2.10 - second filter;

2.11, 2.12 - stop valves;

2.13 - distribution pipeline;

2.14 - auxiliary pump;

2.15 - the first drain pipe for cleaning the filter surface;

2.16 - second drain pipeline for cleaning the filter surface;

2.17, 2.18 - stop valves;

2.19 - the first differential pressure gauge;

2.20 - second differential pressure gauge;

2.21 - cooling pipeline for the upper bearing of the electric motor of the circulation pump;

2.22 - the first oil bath;

2.23 - the first coil heat exchanger;

2.24 - the first water drain pipeline;

2.25 - cooling pipeline for the lower bearing of the electric motor of the circulation pump;

2.26 - second oil bath;

2.27 - second coil heat exchanger;

2.28 - the second pipeline for draining water;

2.29 - pipeline for cooling the upper bearing of the circulation pump;

2.30 - housing of the upper bearing of the circulation pump;

2.31 - third water drain pipeline;

2.32 - pipeline for cleaning the first filter;

2.33 - shutoff valves;

2.34 - pipeline for cleaning the second filter;

2.35 - shutoff valves;

2.36 - pressure pipeline of circulating water;

2.37 - the electric motor of the circulation pump.

Implementation of the invention

Below is a particular example of a cooling system for bearings of pumping units and the principle of its operation.

The cooling system for the bearings of the pumping units contains a circulation pump OPV 5-110-KE (Fig. 1), the inlet of which is connected to the cooling water supply 2.1, and the outlet of its discharge pipe 2.2 to the circulation water pressure pipeline 2.36, which is connected to two cooling water filtration pipelines 2.3 and 2.4. At the same time, a check valve 2.5, stop valves 2.7, the first filter 2.9 and stop valves 2.11 are installed in series on the pipeline line 2.3, and a check valve 2.6, stop valves 2.8, the second filter 2.10 and stop valves 2.12 are installed in series on the pipeline line 2.4. Moreover, the cooling water filtration pipelines 2.3 and 2.4 are connected to the distribution pipeline 2.13, on the line of which an auxiliary pump 2.14 is installed, which was used as a pump 1.5K-6. In this case, the first filter 2.9 contains a drain pipeline connected to it up to its filtering surface in the direction of the water flow for cleaning the filtering surface 2.15, on the line of which a shut-off valve 2.17 is installed, and the second filter contains a drain pipeline connected to it up to its filtering surface in the direction of the water flow for cleaning the filtering surface 2.16, on the line of which a shut-off valve 2.18 is installed. Moreover, the first differential pressure gauge 2.19 is installed on the line of the cooling water filtration pipeline 2.3 between the inlet and outlet of the first filter 2.9, and the second differential pressure gauge 2.20 is installed on the line of the cooling water filtration pipeline 2.4 between the inlet and outlet of the second filter 2.10. As the first and second filters 2.9 and 2.10, mesh filters ZETKAMA 821A Du50 Ru16 fl, Tmax = 300 821A050C50 are used, and as the first and second differential pressure gauges 2.19 and 2.20 - differential pressure sensors with IP65 digital indicators complete with SAPFIR-22EM pressure transducers .

As the electric motor of the circulation pump 2.37, the VAN 143-51-12UZ electric motor is used. At the same time, the distribution pipeline 2.13 is connected to the cooling pipeline of the upper bearing of the electric motor of the circulation pump 2.21, on the line of which the first coil heat exchanger 2.23 is installed, immersed in the first oil pan 2.22, which is the housing of the upper bearing of the electric motor of the circulation pump. Moreover, the first coil heat exchanger 2.23 is connected to the first water drain pipe 2.24.

At the same time, the distribution pipeline 2.13 is connected to the cooling pipeline of the lower bearing of the electric motor of the circulation pump 2.25, on the line of which the second coil heat exchanger 2.27 is installed, immersed in the second oil bath 2.26, which is the housing of the lower bearing of the electric motor of the circulation pump. Moreover, the second coil heat exchanger 2.27 is connected to the second water drain pipeline 2.28.

In this case, the distribution pipeline 2.13 is connected to the cooling pipeline of the upper bearing of the circulation pump 2.29, which is connected to the inlet to the housing of the upper bearing of the circulation pump 2.30. Moreover, the output from the housing of the upper bearing of the circulation pump 2.30 is connected to the third water drain pipeline 2.31.

At the same time, the distribution pipeline 2.13 is connected to the first cooling water filtration pipeline 2.3 using a pipeline for cleaning the first filter 2.32, on the line of which a stop valve 2.33 is installed, between the outlet of the first filter 2.9 and the stop valve 2.11 installed after it. Also, the distribution pipeline 2.13 is connected to the second cooling water filtration pipeline 2.4 using a pipeline for cleaning the second filter 2.34, on the line of which a shut-off valve 2.35 is installed, between the outlet of the second filter 2.10 and the shut-off valve 2.12 installed after it (Fig. 2).

The operation of the cooling system for bearings of pumping units is carried out as follows.

In the absence of contamination of the filtering surface of the first filter 2.9 and the second filter 2.10, shutoff valves 2.8, 2.12, 2.17, 2.18, 2.33 and 2.35 are transferred to the "closed" position, and shutoff valves 2.7 and 2.11 - to the "open" position. In this case, the cooling water from a natural source of water supply enters the circulation pump through the cooling water supply 2.1, after which most of the water enters through the pressure pipeline 2.36 to cool the condenser (not shown in Fig.), and a smaller part of the water enters through the first cooling water filtration pipeline 2.3, on the line of which the first filter 2.9 is installed, into the distribution pipeline 2.13. From the distribution pipeline 2.13, with the help of an auxiliary pump 2.14, water is pumped: through the cooling pipeline of the upper bearing of the electric motor of the circulation pump 2.21 into the first coil heat exchanger 2.23, located inside the first oil tank 2.22; through the cooling pipeline of the lower bearing of the electric motor of the circulation pump 2.25 to the second coil heat exchanger 2.27, located inside the second oil tank 2.26; and through the cooling pipeline of the upper bearing of the circulation pump 2.29 into the housing of the upper bearing of the circulation pump 2.30. From the first coil heat exchanger 2.23, the second coil heat exchanger 2.27 and the housing of the upper bearing of the circulation pump 2.30, water is drained through the first water drain pipe 2.24, the second water drain pipe 2.28 and the third water drain pipe 2.31 into a common collector (not shown in Fig.), from which the water is drained back into the natural water supply. Cooling of the upper and lower bearings of the electric motor of the circulation pump is carried out due to heat exchange between the cooling water flowing through the first and second coil heat exchangers 2.23 and 2.27, and the oil located in the first and second oil pans 2.22, 2.26 and lubricating the upper and lower bearings of the electric motor. In this case, the cooling of the lower bearing of the circulation pump 1.4 (Fig. 1) is carried out due to the water flowing through the outlet pipe of the circulation pump 2.2.

Pollution of the filtering surface of the first filter 2.9 is fixed according to the readings of the first differential pressure gauge 2.19 when the predetermined value of the pressure difference between the inlet and outlet of the first filter 2.9 is reached. When the filtering surface of the first filter 2.9 is contaminated, the shut-off valves 2.7 and 2.11 are transferred to the “closed” position (the shut-off valves 2.18 and 2.35 remain in the “closed” position), and the shut-off valves 2.8, 2.12, 2.17 and 2.33 are transferred to the “open” position . In this case, the water pumped by the circulation pump enters through the second cooling water filtration pipeline 2.4, on the line of which the second filter 2.10 is installed, into the distribution pipeline 2.13, from which part of the water flows to cool the upper and lower bearings of the electric motor and the upper bearing of the pump 1.13, as follows was shown above. At the same time, the other part of the water from the distribution pipeline 2.13 enters through the pipeline for cleaning the first filter 2.32 into the pipeline 2.3 and passes through the filter surface of the first filter 2.9 in the opposite direction, carrying away the debris that has settled on the filter surface of the first filter 2.9 from its inlet side, after whereupon the specified part of the water flows from the first filter 2.9 to the first drain pipeline for cleaning the filter surface 2.15, from which the water drains into a common collector (not shown in Fig.), and then from the collector into a natural source of water supply. Cleaning takes place until the value of the differential pressure on the differential pressure gauge 2.19 of the filter 2.9 becomes equal to the set value corresponding to the completion of cleaning the filter surface of the filter 2.9. After that, the shut-off valves 2.17, 2.33 are transferred to the closed position, and the filter 2.9 itself on the filter line 2.3 is transferred to the reserve.

Pollution of the filtering surface of the second filter 2.10 is recorded according to the readings of the second differential pressure gauge 2.20 when the predetermined value of the pressure difference between the inlet and outlet of the second filter 2.10 is reached. When the filtering surface of the second filter 2.10 is contaminated, the shut-off valves 2.8, 2.12, 2.17 and 2.33 are transferred to the “closed” position, and the shut-off valves 2.7, 2.11, 2.18 and 2.35 are transferred to the “open” position. In this case, the water pumped by the circulation pump enters through the first cooling water filtration pipeline 2.3, on the line of which the first filter 2.9 is installed, into the distribution pipeline 2.13, from which part of the water flows to cool the upper and lower bearings of the electric motor and the upper bearing of the pump 1.13, as follows was shown above. At the same time, the other part of the water from the distribution pipeline 2.13 flows through the pipeline for cleaning the second filter 2.34 into the pipeline 2.4 and passes through the filtering surface of the second filter 2.19 in the opposite direction, taking with it the debris that has settled on the filtering surface of the second filter 2.10 from its inlet side, after whereby the specified part of the water flows from the second filter 2.10 to the second drain pipeline for cleaning the filtering surface 2.16, from which the water drains into a common collector (not shown in Fig.), and then from the collector into a natural source of water supply. Cleaning takes place until the value of the differential pressure on the differential pressure gauge 2.20 of the filter 2.10 becomes equal to the set value corresponding to the completion of the cleaning of the filter surface of the filter 2.10. After that, the shut-off valves 2.18, 2.35 are transferred to the closed position, and the filter 2.10 itself on the filter line 2.4 is transferred to the reserve.

Thus, the presence in the cooling system of the bearings of the pumping units of two pipelines for filtering the cooling water 2.3 and 2.4, each of which is connected to the distribution pipeline 2.13, connected to the cooling pipelines of the bearings of the pumping unit 2.21, 2.25 and 2.29, ensures the filtration of water supplied from a natural source of water supply through the supply of cooling water 2.1 to the cooling system of the bearings of pumping units, due to the first filter 2.9 installed on the line of the cooling water filtration pipeline 2.3, and the second filter 2.10 installed on the line of the cooling water filtration pipeline 2.4.

At the same time, the possibility of alternately cleaning filters 2.9 or 2.10, without interrupting the cooling of the bearings, is ensured by the possibility of closing the shut-off valves 2.7 and 2.11 installed on the line of the first cooling water filtration pipeline 2.3, or the shut-off valves 2.8 and 2.12 installed on the line of the second cooling water filtration pipeline 2.4 and supplying water in reverse to the filtering surface of one of the filters 2.9 or 2.10 through one of the pipelines for cleaning filters 2.32 or 2.34 connected to the distribution pipeline 2.13, and removing debris from the filtering surface of one of the filters 2.9 or 2.10 through the first drain pipeline for cleaning filter surface 2.15, connected to the filter 2.9 up to its filter surface in the direction of water flow, or a second drain pipe for cleaning the filter surface 2.16, connected to filter 2.10 up to its filter surface in the direction of water flow. In this case, the opening of the shut-off valves 2.33 installed on the pipeline line for cleaning the first filter 2.32, or the opening of the shut-off valves 2.35 installed on the pipeline line for cleaning the second filter 2.34, and the opening of the shut-off valves 2.17 installed on the pipeline line for cleaning the filter surface 2.15, or opening of shut-off valves 2.18 installed on the drain pipeline line to clean the filter surface 2.16. Moreover, the cooling water is supplied to the cooling system of the bearings of the pumping unit through the cooling water filtration pipeline 2.3 or 2.4 by opening the shut-off valves 2.7 and 2.11 installed on the pipeline line 2.3 before and after the first filter 2.9, or by opening the shut-off valves 2.8 and 2.12 installed on the line pipeline 2.4 before and after the second filter 2.10. At the same time, the degree of pollution of the filtering surface of the first filter 2.9 is controlled by the readings of the pressure drop on the differential pressure gauge 2.19, and the second filter 2.10 is controlled by the readings of the pressure drop on the differential pressure gauge 2.20.

Industrial Applicability

The patented invention meets the condition of "industrial applicability". The essence of the technical solution is disclosed in the formula, description and drawings clearly enough for understanding and industrial implementation by the relevant specialists, and the means used are simple and accessible for industrial implementation in the field of pump unit bearing cooling systems.

Claims (5)

The cooling system for the bearings of pumping units, characterized in that it contains a circulation pump, the inlet of which is connected to the cooling water supply pipeline, and the outlet pipe of the circulation pump is connected to the pressure pipeline, which is connected to at least two cooling water filtration pipelines, on the line of each of which a non-return valve, a first shutoff valve, a filter and a second shutoff valve are installed in series; wherein each of said cooling water filtration pipelines is connected to a distribution pipeline, on the line of which an auxiliary pump is installed; moreover, each filter contains attached to it up to its filtering surface in the direction of water flow drain pipeline for cleaning the filtering surface, on the line which is installed shutoff valves; at the same time, a differential pressure gauge is installed on the line of each cooling water filtration pipeline between the inlet and outlet of the filter; wherein the distribution pipeline is connected to the cooling pipeline of the upper bearing of the electric motor of the circulation pump, on the line of which the first heat exchanger is installed, immersed in the first oil bath, connected to the first water drain pipeline; and inside the first maslovanna placed the upper bearing of the motor; wherein the distribution pipeline is connected to the cooling pipeline of the lower bearing of the electric motor of the circulation pump, on the line of which the second heat exchanger is installed, immersed in the second oil bath, connected to the second water drain pipeline; and inside the second maslovanny placed the lower bearing of the motor; wherein the distribution pipeline is connected to the cooling pipeline of the upper bearing of the circulation pump, which is connected to the inlet to the housing of the upper bearing of the circulation pump; moreover, the output from the upper bearing housing of the circulation pump is connected to the third water drain pipe; wherein the distribution pipeline is also connected to each of at least two cooling water filtration pipelines by means of pipelines for filter cleaning, neither of which has a shut-off valve installed between the filter outlet and the shut-off valve installed after it.

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