Lubricating and cooling system

Abstract

The utility model discloses a lubricating and cooling system which comprises an oil tank, a working oil pump, a heat exchanger and a first filter which are sequentially connected, and lubricating oil in the oil tank sequentially passes through the working oil pump, the heat exchanger and the first filter and then enters a bearing lubricating chamber of a turboset. An oil outlet of the bearing lubricating chamber is connected with an oil return port of the oil tank; wherein the working oil pump comprises a main oil pump and a standby oil pump, the main oil pump and the standby oil pump are connected with the heat exchanger through a first pipeline and are arranged in parallel, and the working oil pump, the heat exchanger and the first filter are all arranged above the oil tank. Through the arrangement of the main oil pump and the standby oil pump, the turboset does not need to be shut down when the lubricating and cooling system is overhauled, it is guaranteed that the turboset always operates normally, and the production efficiency of an enterprise is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of turbine safety protection, in particular to a lubrication cooling system. Background Art

[0002] Steam turbine units are large-scale machines that run at high speeds and generate a lot of heat when working. Their support bearings and thrust bearings require a lot of oil for lubrication and cooling. Therefore, steam turbines must have an oil supply system to ensure the normal operation of the above devices. With the increasing popularity of the concept of smart power plants, higher requirements are also placed on the safe, stable and fully automatic operation of the entire unit.

[0003] The current lubrication and cooling system requires the steam turbine unit to be shut down when the lubrication and cooling system needs to be inspected and maintained, which will cause the unit to be unable to operate normally and affect the company's production efficiency. Utility Model Content

[0004] The utility model aims to solve at least one of the technical problems existing in the prior art or related technology.

[0005] In view of this, the utility model provides a lubrication and cooling system, wherein the lubrication and cooling system, through the setting of a main oil pump and a backup oil pump, can ensure that the steam turbine unit always operates normally and improve the production efficiency of the enterprise when the lubrication and cooling system is under maintenance without shutting down the steam turbine unit.

[0006] Specifically, the following technical solutions are included:

[0007] The utility model provides a lubrication and cooling system, which comprises an oil tank, a working oil pump, a heat exchanger and a first filter connected in sequence, wherein the lubricating oil in the oil tank passes through the working oil pump, the heat exchanger and the first filter in sequence and then enters the bearing lubrication chamber of the steam turbine unit, and the oil outlet of the bearing lubrication chamber is connected to the oil return port of the oil tank;

[0008] Among them, the working oil pump includes a main oil pump and a backup oil pump, the main oil pump and the backup oil pump are connected to the heat exchanger through a first pipeline, the main oil pump and the backup oil pump are arranged in parallel, and the working oil pump, the heat exchanger and the first filter are all arranged above the oil tank.

[0009] Optionally, the cooling system further comprises:

[0010] The second filter is arranged between the oil outlet of the bearing lubrication chamber and the oil return port of the oil tank. The second filter is connected to the oil outlet of the bearing lubrication chamber and the oil return port of the oil tank through a fourth pipeline.

[0011] Optionally, the lubrication and cooling system further comprises:

[0012] A jacking oil device is arranged above the oil tank and is used to control the lifting and lowering of the rotor of the steam turbine unit. The oil inlet of the jacking oil device is connected to the oil outlet of the first filter, the oil outlet of the jacking oil device is connected to the oil inlet of the bearing lubrication chamber, and the oil return port of the jacking oil device is connected to the oil return port of the oil tank.

[0013] Optionally, the lubrication and cooling system further comprises:

[0014] An accumulator is arranged at one side of the oil tank, and the accumulator is connected between the oil outlet of the first filter and the oil inlet of the bearing lubrication chamber through a pipeline;

[0015] An emergency oil pump, wherein the oil outlet of the emergency oil pump is connected to the oil outlet of the first filter and the oil inlet of the bearing lubrication chamber through a second pipeline.

[0016] Optionally, the lubrication and cooling system further comprises:

[0017] A control cabinet, arranged on a side wall of the oil tank;

[0018] A heater is arranged at the bottom of the oil tank, and the heater is connected to the control cabinet;

[0019] A thermometer is arranged on the side wall of the oil tank and is connected to the control cabinet. The thermometer obtains the temperature of the lubricating oil in the oil tank and transmits it to the control cabinet. The control cabinet controls the opening and closing of the heater according to the temperature of the lubricating oil.

[0020] Optionally, a temperature control valve is further provided on the oil tank, and the temperature control valve is located between the heat exchanger and the first filter. The temperature control valve is respectively connected to the heat exchanger and the first filter through a third pipeline, and the temperature control valve is configured to control the outlet oil temperature of the heat exchanger.

[0021] Optionally, the lubrication cooling system has two heat exchangers, and the two heat exchangers are connected via a three-way switching valve, and the three-way switching valve is configured to switch the states of the two heat exchangers;

[0022] The lubrication cooling system includes two first filters, the first filters are duplex filters, the two first filters are connected via a six-way switching valve, and the six-way switching valve is configured to switch the states of the two first filters.

[0023] Optionally, the lubrication and cooling system further comprises:

[0024] The liquid level transmitter comprises a magnetic flap liquid level gauge and a guided wave radar liquid level gauge. The liquid level transmitter is arranged on the side wall of the oil tank and is connected to the control cabinet.

[0025] Optionally, the lubrication and cooling system further comprises:

[0026] An oil mist separator is arranged above the oil tank, the inlet and the liquid outlet of the oil mist separator are both connected to the oil tank, and the air outlet of the oil mist separator is connected to the exhaust pipe;

[0027] An explosion-proof plate is arranged on the side wall of the oil tank, and the explosion-proof plate is located at an end away from the bottom wall of the oil tank.

[0028] Optionally, the lubrication and cooling system further comprises:

[0029] An emergency oil drain port, the emergency oil drain port is arranged at the bottom of the oil tank, and the diameter of the emergency oil drain port is 180 mm to 220 mm;

[0030] An oil purification device interface is arranged on the side wall of the oil tank, the oil purification device interface includes an oil supply interface and an oil return interface, the oil supply interface is located at one end of the oil tank close to the bottom wall, the oil return interface is located at one end of the oil tank away from the bottom wall, and the oil purification device interface is connected to the oil purification device;

[0031] The lubricating oil cooling system further comprises: an inspection hole, the oil tank comprises a cover plate, and the inspection hole is arranged on the cover plate;

[0032] Lifting ears, a plurality of the lifting ears are symmetrically arranged on the two side walls of the oil tank.

[0033] The lubrication and cooling system provided by the embodiment of the utility model comprises an oil tank, a working oil pump, a heat exchanger and a first filter which are connected in sequence through pipelines, and the lubrication oil in the oil tank is transported to the bearing lubrication chamber of the steam turbine unit, so as to provide lubrication oil for the steam turbine unit and ensure the stable operation of the steam turbine unit; the temperature of the lubrication oil entering the bearing lubrication chamber can be ensured by setting the heat exchanger, so as to meet the requirements of the steam turbine unit on the lubrication oil temperature and improve the reliability of the operation of the steam turbine unit; the first filter can prevent impurities from entering the bearing lubrication chamber and causing wear on the bearing, so as to improve the service life of the steam turbine unit and extend the maintenance time of the steam turbine unit; the oil outlet of the bearing lubrication chamber is connected to the oil return port of the oil tank, so that the lubrication oil Oil reuse can improve the utilization rate of lubricating oil and improve the economy of the lubrication and cooling system; the working oil pump, heat exchanger and first filter are all arranged above the oil tank, which has a more compact structure, thereby reducing the footprint of the lubrication and cooling system and improving the scope of application of the lubrication and cooling system; the working oil pump includes a main oil pump and a standby oil pump, the main oil pump is connected to the oil tank and the heat exchanger respectively through a first pipeline, and the standby oil pump is connected to the oil tank and the heat exchanger respectively through a first pipeline, so as to realize the parallel connection of the main oil pump and the standby oil pump. When the main oil pump fails or needs to be overhauled, the standby oil pump can continue to provide lubricating oil to the bearing lubrication chamber of the steam turbine unit without shutting down the steam turbine unit, thereby ensuring the normal operation of the steam turbine unit and improving the production efficiency of the enterprise.

[0034] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0036] Figure 1 A side view of a lubrication and cooling system according to an embodiment of the utility model;

[0037] Figure 2 It is a top view of a lubrication and cooling system according to an embodiment of the utility model.

[0038] in, Figure 1 and Figure 2 The corresponding relationship between the reference numerals and the component names is as follows:

[0039] 100 Lubrication and cooling system, 101 oil tank, 102 main oil pump, 103 standby oil pump, 104 emergency oil pump, 105 heat exchanger, 106 first filter, 107 oil mist separator, 108 accumulator, 109 jacking oil device, 110 second filter, 111 heater, 112 control cabinet, 113 explosion-proof panel, 114 temperature control valve, 115 first pipeline, 116 third pipeline, 117 second pipeline, 118 emergency oil drain port, 119 thermometer, 120 liquid level transmitter, 121 three-way switching valve, 122 six-way switching valve, 123 lifting lug, 124 inspection hole, 125 oil purification device interface. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0041] Before further describing the embodiments of the present invention in detail, the directional terms involved in the embodiments of the present invention, such as "upper part", "lower part" and "side part", do not have the meaning of limiting the protection scope of the present invention.

[0042] In order to make the technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0043] like Figure 1 and Figure 2 As shown, an embodiment of the utility model provides a lubrication and cooling system 100, which includes an oil tank 101, a working oil pump, a heat exchanger 105 and a first filter 106 connected in sequence. The lubricating oil in the oil tank 101 passes through the working oil pump, the heat exchanger 105 and the first filter 106 in sequence, and then enters the bearing lubrication chamber of the steam turbine unit. The oil outlet of the bearing lubrication chamber is connected to the oil return port of the oil tank;

[0044] Among them, the working oil pump includes a main oil pump 102 and a backup oil pump 103, the main oil pump 102 and the backup oil pump 103 are connected to the heat exchanger 105 through the first pipeline 115, the main oil pump 102 and the backup oil pump 103 are arranged in parallel, and the working oil pump, the heat exchanger 105 and the first filter 106 are all arranged above the oil tank 101.

[0045] It should be noted that the lubrication and cooling system 100 of the present application can be widely used in industries such as petroleum, chemical industry, electric power and air separation to provide lubricating oil for large steam turbine units therein.

[0046] The lubrication and cooling system 100 includes an oil tank 101, a working oil pump, a heat exchanger 105 and a first filter 106 which are sequentially connected by pipelines, and the lubrication oil in the oil tank 101 is transported to the bearing lubrication chamber of the steam turbine unit to provide lubrication oil for the steam turbine unit and ensure the stable operation of the steam turbine unit; the heat exchanger 105 is provided to ensure the temperature of the lubrication oil entering the bearing lubrication chamber, meet the requirements of the steam turbine unit on the lubrication oil temperature, and improve the reliability of the steam turbine unit; the first filter 106 is provided to prevent impurities from entering the bearing lubrication chamber and causing wear on the bearing, thereby improving the service life of the steam turbine unit and extending the maintenance time of the steam turbine unit; the oil outlet of the bearing lubrication chamber is connected to the oil return port of the oil tank 101, so that the lubrication oil is reused, which can improve the utilization rate of the lubrication oil and improve the efficiency of the lubrication and cooling system 1 00's economy; the working oil pump, the heat exchanger 105 and the first filter 106 are all arranged above the oil tank 101, and the structure is more compact, thereby reducing the footprint of the lubrication and cooling system 100 and improving the application scope of the lubrication and cooling system 100; the working oil pump includes a main oil pump 102 and a standby oil pump 103, the main oil pump 102 is connected to the oil tank 101 and the heat exchanger 105 respectively through a first pipeline 115, and the standby oil pump 103 is connected to the oil tank 101 and the heat exchanger 105 respectively through the first pipeline 115, so as to realize the parallel connection of the main oil pump 102 and the standby oil pump 103. When the main oil pump 102 fails or needs to be overhauled, the standby oil pump 103 can continue to provide lubricating oil to the bearing lubrication chamber of the steam turbine unit, without shutting down the steam turbine unit, thereby ensuring the normal operation of the steam turbine unit and improving the production efficiency of the enterprise.

[0047] Specifically, the heat exchanger 105 is usually a plate heat exchanger, which has good heat exchange efficiency, thereby improving the cooling effect of the lubricating and cooling system 100; compact structure, small footprint, thereby ensuring the flexibility of the lubricating and cooling system 100; having a long service life, thereby extending the maintenance time, improving the efficiency of the lubricating and cooling system 100, and extending the service life of the lubricating and cooling system 100. The plate heat exchanger cools the lubricating oil output by the working oil pump to the allowable oil supply temperature by connecting to the external circulating water pipeline, that is, to achieve the cooling of the lubricating oil and ensure the normal operation of the steam turbine unit. The first filter 106 adopts a double filter, which ensures the lubricating oil output by the lubricating and cooling system 100 through a 40μm filter element, and can meet the cleanliness requirements of entering the steam turbine unit. The double filter has many advantages such as good sealing, strong flow capacity, simple operation, etc., with a wide range of applications and strong adaptability; at the same time, the filter bag of the double filter has a small probability of side leakage, can accurately ensure the filtering accuracy, and can quickly replace the filter bag, and there is basically no material consumption in the filtering, reducing the filtering operation cost. Both the main oil pump 102 and the backup oil pump 103 are centrifugal pumps, which are driven by a driving motor to provide lubricating oil to the lubrication and cooling system 100, thereby maintaining the stability of the oil volume and oil pressure of the lubrication and cooling system 100. No additional adjustment device is required, which simplifies the structure of the lubrication and cooling system 100 and makes the structure of the lubrication and cooling system 100 more compact.

[0048] It is necessary to explain that the oil tank 101 includes a bottom plate, a side plate and a cover plate, and the bottom plate, the side plate and the cover plate enclose a closed cavity for storing lubricating oil. The oil tank 101 also includes ribs, internal supports and bottom supports to improve the strength of the oil tank 101, so as to improve the supporting strength of the working oil pump, the heat exchanger 105 and the first filter 106 arranged on the oil tank 101, thereby ensuring the working reliability of the lubrication and cooling system 100.

[0049] In a feasible implementation manner, the cooling system 100 further includes:

[0050] The second filter 110 is disposed between the oil outlet of the bearing lubrication chamber and the oil return port of the oil tank 101 . The second filter 110 is connected to the oil outlet of the bearing lubrication chamber and the oil return port of the oil tank 101 through a fourth pipeline.

[0051] Among them, a second filter 110 is arranged between the oil outlet of the bearing lubrication chamber and the oil return port of the oil tank 101, and the lubricating oil in the bearing lubrication chamber is filtered before returning to the oil tank 101 to avoid bringing impurities and dust in the bearing lubrication chamber back into the oil tank 101, thereby improving the purity of the lubricating oil and avoiding impurities and dust from polluting the lubricating oil in the oil tank 101.

[0052] In a feasible implementation manner, the lubrication cooling system 100 further includes:

[0053] The top shaft oil device 109 is arranged above the oil tank 101 and is used to control the lifting and lowering of the rotor of the turbine unit. The oil inlet of the top shaft oil device 109 is connected to the oil outlet of the first filter 106, the oil outlet of the top shaft oil device 109 is connected to the oil inlet of the bearing lubrication chamber, and the oil return port of the top shaft oil device 109 is connected to the oil return port of the oil tank.

[0054] Among them, the top shaft oil device 109 includes an oil pump, a filter, a relief valve and an accumulator, forming a small oil supply system. It uses its own oil pump to take out part of the lubricating oil after passing through the first filter 106, and then pressurizes and injects it into the bearing area of ​​the unit after filtering through its own filter, which is used for lifting the rotor during the start-up and shutdown of the turbine.

[0055] Specifically, as the capacity of the steam turbine unit continues to increase, the weight of the rotor increases accordingly, and a single lubricating oil can no longer meet the needs of continuous cranking. In order to reduce the rotor rotation torque in the steam turbine unit and avoid wear of the bearing, it is also necessary to add a top shaft oil device 109 to the steam turbine unit. When continuous cranking is performed, the top shaft oil device is turned on to ensure the stable rotation of the rotor in the steam turbine unit; at the same time, when the steam turbine unit is running at a low speed, an oil film is formed by passing high-pressure oil between the journal and the bearing to avoid contact between the journal and the bearing, prevent friction and abrasion, which can not only reduce the cranking power of the steam turbine and ensure smooth operation during cranking, but also prevent low-speed grinding of the bearing, reduce the cranking torque, and provide protection for the rotor and bearing.

[0056] It should be noted that the built-in accumulator maintains pressure stability when the oil pump is started and fault-switched, and the relief valve can discharge the excess lubricating oil output by the oil pump and return it to the oil tank 101, ensuring the stability of the output flow of the top shaft oil device 109. The top shaft oil device 109 is set to be opened and closed completely manually. The top shaft oil device 109 is manually controlled to be opened before the rotor lifting work is required. According to the actual situation on site, it is selected to be continuously opened or manually closed when the rotor reaches a sufficient speed and the working oil pump is supplying lubricating oil normally. The oil return port of the top shaft oil device 109 is connected to the oil return port of the oil tank 101, and can return to the oil tank 101 after passing through the second filter 110.

[0057] In a feasible implementation manner, the lubrication cooling system 100 further includes:

[0058] The accumulator 108 is disposed at one side of the oil tank 101, and the accumulator 108 is connected between the oil outlet of the first filter 106 and the oil inlet of the bearing lubrication chamber through a pipeline;

[0059] The emergency oil pump 104 , the oil outlet of the emergency oil pump 104 is connected to the oil outlet of the first filter 106 and the oil inlet of the bearing lubrication chamber through the second pipeline 117 .

[0060] It can be understood that the accident oil pump 104 is connected to the emergency power supply to drive the operation of the accident oil pump 104. In the event of a power outage in the factory, the accident oil pump 104 continues to output sufficient lubricating oil to the lubrication and cooling system 100 to ensure that the steam turbine unit can be shut down stably. That is to say, when both the main oil pump 102 and the backup oil pump 103 fail or the power outage in the factory makes both of them unable to work, the steam turbine unit will also shut down at this time, but due to inertia, the steam turbine unit will continue to run for a period of time. At this time, lubricating oil is still needed to avoid turbine unit failure caused by oil-free operation. The accident oil pump 104 is started to supply oil to the steam turbine unit. When the steam turbine unit is shut down stably, the accident oil pump 104 is manually shut down.

[0061] It should be noted that the accumulator 108 includes a bracket, a cylinder and a bladder. The accumulator 108 is connected to the emergency oil pump 104, and nitrogen is input into the bladder. At the same time, lubricating oil is filled in the cylinder. When the main oil pump 102 is working, the lubricating oil will be brought into the cylinder for storage. When the main oil pump 102 stops working (it may be due to a failure of the main oil pump 102, or the main oil pump 102 is manually shut down when maintenance is required), the overall control system of the turbine unit will automatically trigger the start of the backup oil pump 103. However, it takes a certain amount of time for the backup oil pump 103 to reach the oil supply pressure. During this period of time, the main oil pump 102 has stopped, so the accumulator 108 is used to maintain the oil supply pressure stable to ensure that the turbine unit can operate continuously without being affected by the switching of the main oil pump 102 and the backup oil pump 103. Specifically, the lubricating oil stored in the cylinder is input into the bearing lubrication chamber through the nitrogen in the airbag to ensure the stability of the oil supply pressure when the standby oil pump 103 is just started. When the standby oil pump 103 runs stably, the accumulator 108 stops working. Through the setting of the accumulator 108, after the main oil pump 102 stops working, the stability of the subsequent standby oil pump 103 supplying oil to the steam turbine unit is guaranteed, and the safety protection of the lubrication and cooling system 100 in an accident state is realized.

[0062] In a feasible implementation manner, the lubrication and cooling system 100 further includes:

[0063] A control cabinet 112 is disposed on a side wall of the oil tank 101;

[0064] A heater 111 is disposed at the bottom of the oil tank 101 and is connected to a control cabinet 112;

[0065] The thermometer 119 is disposed on the side wall of the oil tank 101 and is connected to the control cabinet 112. The thermometer 119 obtains the temperature of the lubricating oil in the oil tank 101 and transmits it to the control cabinet 112. The control cabinet 112 controls the opening and closing of the heater 111 according to the temperature of the lubricating oil.

[0066] Among them, all instruments of the lubrication cooling system 100 are integrated in the control cabinet 112, which belongs to the conventional setting in this field and will not be described in detail. The heater 111 is installed on the side of the bottom of the oil tank 101 to heat the lubricating oil in the oil tank 101, and is used in conjunction with the thermometer 119. The temperature of the lubricating oil in the oil tank 101 is measured in time by the thermometer 119. When the temperature is lower than the set value, the control cabinet 112 controls the heater 111 to turn on and heat the lubricating oil. When the temperature is greater than or equal to the set value, the heater 111 is controlled to turn off by the control cabinet 112. The control cabinet 112 receives the real-time temperature to control the heater 111 to turn on and off, which can not only save energy, but also prevent the lubricating oil with too high temperature from entering the heat exchanger 105 and increasing the workload of the heat exchanger 105.

[0067] It should be noted that the set temperature is usually 42°C to 48°C, and 45°C is usually selected, which means that the lubricating oil temperature in the oil tank 101 is stabilized at 45°C, ensuring that in a low temperature environment, the lubricating oil temperature can meet the starting requirements of the working oil pump and the emergency oil pump 104, thereby ensuring the normal operation of the lubrication cooling system 100.

[0068] It is understandable that the main oil pump 102 and the standby oil pump 103 are interlocked through electrical signals. When the main oil pump 102 stops working, such as when the main oil pump 102 fails, or when the main oil pump 102 is shut down manually for maintenance, the system detects that the motor current of the main oil pump 102 drops, and automatically controls the standby oil pump 103 to start. This is done through the overall control system of the steam turbine unit, and the control cabinet 112 is configured to transmit electrical signals to the central control system. In this way, the standby oil pump 103 replaces the main oil pump 102, and the main oil pump 102 is repaired without stopping, and can be repaired online, ensuring the safe idling of the unit and the stable working condition of the steam turbine unit.

[0069] In a feasible embodiment, a temperature control valve 114 is also provided on the oil tank 101. The temperature control valve 114 is located between the heat exchanger 105 and the first filter 106. The temperature control valve 114 is respectively connected to the heat exchanger 105 and the first filter 106 through a third pipeline 116. The temperature control valve 114 is configured to control the outlet oil temperature of the heat exchanger 105.

[0070] The temperature control valve 114 adopts a self-operated temperature control valve, which can be used in heat exchange occasions. The valve has a simple structure, is easy to operate, has a wide temperature adjustment range, a fast response time, and reliable sealing performance. By automatically adjusting the lubricating oil bypass volume of the heat exchanger 105 (plate heat exchanger), it is ensured that the lubricating oil output from the plate heat exchanger can maintain a stable oil supply temperature at different return oil temperatures, which is 45°C in this embodiment.

[0071] It should be noted that the self-operated temperature control valve does not require external control or power supply. It is automatically controlled according to the temperature set at the factory. The temperature cannot be adjusted after it is set. Therefore, the temperature control valve 114 can automatically control the outlet oil temperature of the heat exchanger 105.

[0072] It is understandable that, in an ideal state, the lubricating oil temperature entering the heat exchanger 105 is 65°C, and the lubricating oil coming out after cooling through the heat exchanger 105 is 45°C. However, in actual operation, because the cooling water conditions are not very stable, an open water source is generally used on site, and the temperature difference between summer and winter is also very large, which may cause the lubricating oil to be higher than 45°C in summer and lower than 45°C in winter. Therefore, a temperature control valve 114 is set here to control the temperature of the lubricating oil. There are two types of temperature control valves 114, self-operated and pneumatic. In short, the self-operated type responds quickly, but the temperature is not very accurate, and the pneumatic type has a very accurate temperature, but responds very slowly. This embodiment selects the self-operated type to ensure that the cooling water temperature and flow rate can be quickly adjusted even when the cooling water temperature and flow rate fluctuate rapidly. The type of temperature control valve 114 can be selected according to actual production needs.

[0073] In a feasible implementation, the lubrication cooling system 100 includes two heat exchangers 105 , and the two heat exchangers 105 are connected via a three-way switching valve 121 , and the three-way switching valve 121 is configured to switch the states of the two heat exchangers 105 ;

[0074] The lubrication cooling system 100 includes two first filters 106 , which are duplex filters. The two first filters 106 are connected via a six-way switching valve 122 , and the six-way switching valve 122 is configured to switch the states of the two first filters 106 .

[0075] It should be noted that two heat exchangers 105 (plate heat exchangers) are used in this embodiment, that is, one is used and the other is reserved. Any plate heat exchanger can independently meet the cooling demand of the lubricating oil, and allows the other plate heat exchanger to be put into use at any time when one plate heat exchanger fails, and the failed plate heat exchanger is repaired online to ensure the normal use of the lubrication cooling system 100. The two plate heat exchangers are connected by a three-way switching valve 121, which is composed of two three-way valves and a connecting rod. The three-way switching valve 121 interface is aligned with the oil inlet and outlet of the plate heat exchanger through the connecting rod, which is used for online switching between the two plate heat exchangers.

[0076] At the same time, the first filter 106 in this embodiment adopts a double filter, and the double filter adopts a one-in-one-standby design, so that any filter can independently meet the lubricating oil filtering requirements, and allows the other filter to be put into use at any time when one filter fails, and the failed filter can be repaired online to ensure the normal use of the lubrication cooling system 100. The double filters are connected by a six-way switching valve 122, which is used to connect the oil inlet and outlet of the double filter for online switching between the two filters.

[0077] It should be noted that the three-way switching valve 121 and the six-way switching valve 122 can be purchased externally. The three-way switching valve 121 can realize the switching use of two plate heat exchangers, and the six-way switching valve 122 can realize the switching use of two double filters, without any restriction.

[0078] In a feasible implementation manner, the lubrication cooling system 100 further includes:

[0079] The liquid level transmitter 120 includes a magnetic flap liquid level gauge and a guided wave radar liquid level gauge. The liquid level transmitter 120 is disposed on the side wall of the oil tank 101 . The liquid level transmitter 120 is connected to the control cabinet 112 .

[0080] It should be noted that the liquid level transmitter 120 of this embodiment includes a magnetic flap level gauge and three guided wave radar level gauges, which can not only observe the liquid level in the oil tank 101 on-site, but also output high and low liquid level alarm signals, and can also serve as a signal source for shutdown control.

[0081] Among them, the magnetic flap level gauge is used to output high and low liquid level alarm signals, and to indicate the liquid level in the oil tank 101 locally; the guided wave radar level gauge is used to output a shutdown control signal. One magnetic flap level gauge and three guided wave radar level gauges are connected to the control cabinet 112, and the signal is transmitted to the general control system of the steam turbine unit through the control cabinet 112. It should be noted that the high and low liquid level alarm signals output by the magnetic flap level gauge are only used for prompting. The liquid level signal output by the guided wave radar level gauge is used for shutdown control. When the liquid level signal output by the guided wave radar level gauge shows that the liquid level in the oil tank 101 is too low, the general control system of the steam turbine unit will trigger the shutdown of the entire unit according to this signal.

[0082] It is understandable that according to the SIL2 standard, the interlocking shutdown signal needs to be two out of three to prevent false alarms caused by reasons such as failure of the guided wave radar level gauge, so three guided wave radar level gauges are set.

[0083] In a feasible implementation manner, the lubrication cooling system 100 further includes:

[0084] The oil mist separator 107 is disposed above the oil tank 101, the inlet and the liquid outlet of the oil mist separator 107 are both connected to the oil tank 101, and the gas outlet of the oil mist separator 107 is connected to the exhaust pipe;

[0085] The explosion-proof plate 113 is disposed on the side wall of the oil tank 101 . The explosion-proof plate 113 is located at an end away from the bottom wall of the oil tank 101 .

[0086] Among them, since the lubricating oil in the oil tank 101 cannot be filled, some gas and oil smoke are stored in the upper gap, and the oil smoke is extracted and discharged through the oil mist separator 107 to ensure the environmental protection of the lubricating and cooling system 100 and meet the environmental protection requirements. The oil mist separator 107 includes a blower and a three-stage separation system. The blower is driven by a motor to extract the oil smoke in the oil tank. The lubricating oil filtered by the three-stage separation system returns to the oil tank 101 to ensure the normal use of the lubricating and cooling system 100, and the remaining gas that meets the emission requirements is discharged into the atmosphere. It can be understood that the oil mist separator 107 is always in working condition to ensure environmental protection requirements.

[0087] It should be noted that the explosion-proof plate 113 is installed on the side wall of the oil tank 101 and is located above the highest liquid level. When an explosion occurs in the oil tank 101, the damage can be minimized. Since the oil tank 101 is a closed container, but the body of the oil tank 101 can hardly withstand pressure, when a fire or explosion occurs inside, the internal pressure is released through the explosion-proof plate 113 to prevent damage to the oil tank 101. Its principle is similar to the air release valve on a pressure cooker. When working normally, the explosion-proof plate 113 can ensure the sealing of the oil tank 101. Once an explosion occurs, the explosion-proof plate 113 breaks open, and the internal explosion pressure is released through the explosion-proof plate 113. In this way, the oil tank 113 can be used continuously after the explosion-proof plate 113 is replaced, so as to avoid the deformation or rupture of the oil tank 113 under pressure, which causes the entire oil tank 101 to be unusable, thereby improving the economy of the lubrication and cooling system 100.

[0088] It can be understood that the control cabinet 112 places all the instruments in the lubrication cooling system 100 in a unified manner, ensures the integrity of the lubrication cooling system 100, and protects the instruments; at the same time, the control cabinet 112 transmits the received relevant signals of the lubrication cooling system 100 to the overall control system of the steam turbine unit, thereby realizing the control of the entire lubrication cooling system 100, realizing automatic heating, automatic adjustment and automatic cleaning of the lubrication cooling system 100, reducing manual participation, and reducing the labor intensity of the staff.

[0089] In a feasible implementation manner, the lubrication cooling system 100 further includes:

[0090] An emergency oil drain port 118 is provided at the bottom of the oil tank 101, and the diameter of the emergency oil drain port 118 is 180 mm to 220 mm;

[0091] The oil purification device interface 125 is arranged on the side wall of the oil tank 101. The oil purification device interface includes an oil supply interface and an oil return interface. The oil supply interface is located at one end of the oil tank 101 close to the bottom wall, and the oil return interface is located at one end of the oil tank 101 away from the bottom wall. The oil purification device interface 125 is connected to the oil purification device;

[0092] The lubricating oil cooling system 100 further includes: an inspection hole 124, the oil tank 101 includes a cover plate, and the inspection hole 124 is arranged on the cover plate;

[0093] The lifting ears 123 are symmetrically arranged on the two side walls of the oil tank 101 .

[0094] Among them, the accident oil drain port 118 adopts a large-caliber oil drain port. When an accident occurs in the system, the lubricating oil in the oil tank 101 can be quickly discharged to a safe location. That is to say, when the oil tank 101 catches fire or other surrounding equipment or the environment catches fire, the lubricating oil in the oil tank 101 needs to be discharged. Since the lubricating oil is a flammable liquid, it needs to be discharged to a safe container far away from the accident area to avoid further expansion of the accident and improve the safety of the use of the oil tank 101. The oil purification device interface 125 is used to connect the online oil purification device, which can achieve high-precision filtration of the lubricating oil in the oil tank 101. It can be seen that two oil purification device interfaces 125 need to be set, one oil supply interface is connected to the oil inlet of the purification device, and one oil return interface is connected to the oil outlet of the purification device.

[0095] It should be noted that, generally, only these two interfaces (oil supply interface and oil return interface) are reserved on the oil tank 101. The oil purification device has a fixed type and a mobile type. The fixed type works all the time after being connected, which is equivalent to supplementary filtering for the first filter 106 and the second filter 110, filtering out smaller impurities; the mobile type is pushed to the required position when needed, and connected to the oil purification device interface 125. After the filtering is completed, it is removed and moved to other positions. Different oil purification devices can be selected according to actual needs without limitation.

[0096] It should be noted that the lifting lug 123 is used for the lifting of the entire lubrication and cooling system 100. The design strength of the lifting lug 123 must meet the lifting requirements. In this embodiment, two lifting lugs 123 are respectively provided on the side walls of the oil tank 101 in the length direction to meet the lifting requirements. The lifting lugs 123 are symmetrically arranged on the two side walls of the oil tank 101 to meet the stability and reliability of the lifting. The inspection hole 124 is located at the top of the oil tank 101, that is, on the cover plate. The inspection hole 124 is a through hole. During maintenance, the staff can enter the oil tank 101 through the inspection hole 124 to inspect the oil tank 101.

[0097] It can be understood that the control cabinet 112 places all the instruments in the lubrication cooling system 100 in a unified manner, ensures the integrity of the lubrication cooling system 100, and protects the instruments; at the same time, through the cooperation of the control cabinet 112 and the overall control system of the steam turbine unit, the lubrication cooling system 100 is controlled, and the lubrication cooling system 100 is automatically heated, automatically adjusted and automatically cleaned, thereby reducing manual participation and reducing the labor intensity of the staff.

[0098] It should be noted that the design pressure of the working oil pump and the emergency oil pump 104 in this embodiment is 1.0MPa; the rated flow is 4000L / min; the rated pressure is 0.4MPa. The design pressure of the top shaft oil device 109 is 31.5MPa; the rated flow is 65L / min; the rated pressure is 25MPa; the filtration accuracy is 30μm. The design pressure of the plate heat exchanger is 1.0MPa; the design temperature is 90℃ (the maximum temperature allowed); the lubricating oil flow is 4000L / min; the cooling water flow in the heat exchanger 105 is 5200L / min. The design pressure of the double filter is 1.0MPa; the design temperature is 80℃ (the maximum temperature allowed); the lubricating oil flow is 5000L / min; the filtration accuracy is 40μm. The flow capacity of the temperature control valve 114 is 4065 l / min; the working pressure is 4 barg; the size of the temperature control valve is DN200; the material of the temperature control valve is stainless steel; the set temperature range of the temperature control valve 114 is 38-47°C; the cold side / hot side temperature is 45°C / 65°C. This indicates the working parameters of some components of this embodiment, which can be purchased and used without additional specific requirements on the brand and model, as long as they can meet the use requirements of the lubrication cooling system of this application.

[0099] In the present invention, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. The term "plurality" refers to two or more than two, unless otherwise clearly defined.

[0100] Those skilled in the art will readily conceive of other embodiments of the present invention after considering the specification and practicing the present invention disclosed herein. The present invention is intended to cover any variation, use, or adaptation of the present invention that follows the general principles of the present invention and includes common knowledge or customary technical means in the art that are not disclosed in the present invention. The specification and examples are to be regarded as exemplary only.

[0101] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A lubrication and cooling system, characterized in that: The lubrication and cooling system comprises an oil tank, a working oil pump, a heat exchanger and a first filter which are connected in sequence. The lubricating oil in the oil tank passes through the working oil pump, the heat exchanger and the first filter in sequence and then enters the bearing lubrication chamber of the steam turbine unit. The oil outlet of the bearing lubrication chamber is connected to the oil return port of the oil tank. Among them, the working oil pump includes a main oil pump and a backup oil pump, the main oil pump and the backup oil pump are connected to the heat exchanger through a first pipeline, the main oil pump and the backup oil pump are arranged in parallel, and the working oil pump, the heat exchanger and the first filter are all arranged above the oil tank.

2. The lubrication and cooling system according to claim 1, characterized in that: The cooling system further comprises: The second filter is arranged between the oil outlet of the bearing lubrication chamber and the oil return port of the oil tank. The second filter is connected to the oil outlet of the bearing lubrication chamber and the oil return port of the oil tank through a fourth pipeline.

3. The lubrication and cooling system according to claim 2, characterized in that: The lubrication and cooling system also includes: A jacking oil device is arranged above the oil tank and is used to control the lifting and lowering of the rotor of the steam turbine unit. The oil inlet of the jacking oil device is connected to the oil outlet of the first filter, the oil outlet of the jacking oil device is connected to the oil inlet of the bearing lubrication chamber, and the oil return port of the jacking oil device is connected to the oil return port of the oil tank.

4. The lubrication and cooling system according to claim 1, characterized in that: The lubrication and cooling system also includes: An accumulator is arranged at one side of the oil tank, and the accumulator is connected between the oil outlet of the first filter and the oil inlet of the bearing lubrication chamber through a pipeline; An emergency oil pump, wherein the oil outlet of the emergency oil pump is connected to the oil outlet of the first filter and the oil inlet of the bearing lubrication chamber through a second pipeline.

5. The lubrication and cooling system according to claim 1, characterized in that: The lubrication and cooling system also includes: A control cabinet, arranged on a side wall of the oil tank; A heater is arranged at the bottom of the oil tank, and the heater is connected to the control cabinet; A thermometer is arranged on the side wall of the oil tank and is connected to the control cabinet. The thermometer obtains the temperature of the lubricating oil in the oil tank and transmits it to the control cabinet. The control cabinet controls the opening and closing of the heater according to the temperature of the lubricating oil.

6. The lubrication and cooling system according to claim 1, characterized in that: The oil tank is also provided with a temperature control valve, which is located between the heat exchanger and the first filter. The temperature control valve is connected to the heat exchanger and the first filter respectively through a third pipeline, and the temperature control valve is configured to control the outlet oil temperature of the heat exchanger.

7. The lubrication and cooling system according to claim 1, characterized in that: The lubrication cooling system comprises two heat exchangers, the two heat exchangers are connected via a three-way switching valve, and the three-way switching valve is configured to switch the states of the two heat exchangers; The lubrication cooling system includes two first filters, the first filters are duplex filters, the two first filters are connected via a six-way switching valve, and the six-way switching valve is configured to switch the states of the two first filters.

8. The lubrication and cooling system according to claim 5, characterized in that: The lubrication and cooling system also includes: The liquid level transmitter comprises a magnetic flap liquid level gauge and a guided wave radar liquid level gauge. The liquid level transmitter is arranged on the side wall of the oil tank and is connected to the control cabinet.

9. The lubrication and cooling system according to any one of claims 1 to 8, characterized in that: The lubrication and cooling system also includes: An oil mist separator is arranged above the oil tank, the inlet and the liquid outlet of the oil mist separator are both connected to the oil tank, and the air outlet of the oil mist separator is connected to the exhaust pipe; An explosion-proof plate is arranged on the side wall of the oil tank, and the explosion-proof plate is located at an end away from the bottom wall of the oil tank.

10. The lubrication and cooling system according to any one of claims 1 to 8, characterized in that: The lubrication and cooling system also includes: An emergency oil drain port, the emergency oil drain port is arranged at the bottom of the oil tank, and the diameter of the emergency oil drain port is 180 mm to 220 mm; An oil purification device interface is arranged on the side wall of the oil tank, the oil purification device interface includes an oil supply interface and an oil return interface, the oil supply interface is located at one end of the oil tank close to the bottom wall, the oil return interface is located at one end of the oil tank away from the bottom wall, and the oil purification device interface is connected to the oil purification device; The lubricating oil cooling system further comprises: an inspection hole, the oil tank comprises a cover plate, and the inspection hole is arranged on the cover plate; Lifting ears, a plurality of the lifting ears are symmetrically arranged on the two side walls of the oil tank.

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