Performance test device for steam turbine gear machine

Abstract

The utility model provides a performance test device for a steam turbine gear machine, and belongs to the technical field of steam turbine tests. A plurality of alternating current screw pumps and a plurality of direct current screw pumps are adopted, an oil supply pipe is respectively connected with a first group of alternating current screw pumps controlled by alternating current and a second group of direct current screw pumps controlled by direct current to work, an input pipeline of a circulating pump is connected to a first oil tank, and an output pipeline of the circulating pump is connected to a second oil tank. Basic requirements of a turbine lubricating system and a hydraulic servo-motor execution system are met, the problem that a turbine breaks down in the lubricating oil supply process in the working process is solved, and when no lubricating oil is suddenly supplied in the working process of the turbine, the alternating-current screw pump and the direct-current screw pump act in a matched mode, so that the lubricating oil supply efficiency is improved. Emergency oil supply and lubrication of lubricating oil are guaranteed, and the serious loss consequences of jamming and damage caused by lack of lubrication of a steam turbine due to shutdown caused by sudden damage of the screw pump, power failure and other emergencies are avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of steam turbine testing, in particular to a performance testing device for a steam turbine gear machine. Background Art

[0002] The existing steam turbine system has no protection function. Once a fault occurs, it cannot supply oil to the equipment to be lubricated without AC power or oil pump damage, causing the tested parts to get stuck and damaged, resulting in immeasurable losses. The pre-test device for steam turbines solves this problem. Utility Model Content

[0003] The main purpose of the utility model is to provide a performance test device for a steam turbine gear machine, which can effectively solve the problems in the background technology.

[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0005] A performance test device for a steam turbine gear machine, comprising an AC screw pump, a DC screw pump, a circulating pump, a cooler, a duplex filter, a smoke exhaust centrifugal fan, an oil purifier and a heater.

[0006] Three AC screw pumps are arranged in oil tank 1. The output pipelines of the three AC screw pumps are connected to the oil supply main pipe through clamp check valves and stainless steel bellows respectively. The branch pipes leading out of the oil supply main pipe are provided with self-operated regulating valves and overflow valves.

[0007] The oil supply mother pipe is connected to the input end of the cooler, the branch pipe leading out of the input end of the cooler and the oil supply mother pipe at the output end are respectively connected to the two input ends of the temperature control valve, the output end of the temperature control valve is connected to the input end of the duplex filter through the oil supply mother pipe, and the output end of the duplex filter is connected to the flow sensor through the oil supply mother pipe and the check valve; the input end of the DC screw pump is connected to the oil tank 1 through the oil suction pipeline, and the output pipeline of the DC screw pump is connected to the oil supply pipeline at the output end of the duplex filter through the clamp check valve and the stainless steel bellows;

[0008] The first group of AC control and the second group of DC control are respectively connected to the oil supply main pipe between the check valve and the flow sensor, and the pipelines leading out of the first group of AC control and the second group of DC control are respectively connected to a throttle valve, three pressure switches, a pressure sensor and a solenoid valve; the first group of AC control controls the operation of the three AC screw pumps, and the second group of DC control controls the operation of the DC screw pump;

[0009] Oil tank one is connected with oil tank two through a stainless steel bellows. Oil tank one is connected to the oil purifier through an oil pipeline and then discharged to oil tank two through the oil pipeline. An exhaust pipeline is arranged in oil tank two and connected to the oil fume exhaust interface through an exhaust centrifugal fan. Heaters are arranged in both oil tank one and oil tank two, the input pipeline of the circulating pump is connected to oil tank one, and the output pipeline of the circulating pump is connected to oil tank two.

[0010] The utility model discloses a performance test device for a steam turbine gear machine. The water outlet and water inlet of the cooler are both provided with a pressure sensor and a temperature sensor. The output end of the cooler is subjected to a sampling method.

[0011] The utility model discloses a performance test device for a steam turbine gear machine. Branch pipes are respectively led out on the pipelines between the clamp check valve and three AC screw pumps to arrange stop valves and stainless steel anti-vibration pressure gauges.

[0012] The utility model discloses a performance test device for a steam turbine gear machine. A magnetic flap liquid level sensor is arranged in the first oil tank, a bimetallic thermometer and a temperature sensor are arranged on the first oil tank, and a bimetallic thermometer is arranged on the second oil tank.

[0013] The utility model discloses a performance test device for a steam turbine gear machine, wherein a butterfly valve is arranged on the oil suction pipeline.

[0014] The utility model discloses a performance test device for a steam turbine gear machine, wherein the refueling port of the second oil tank is refueled through a filtering device.

[0015] Compared with the prior art, the utility model has the following beneficial effects: the utility model provides the basic requirements of the steam turbine lubrication system and the oil motor execution system, solves the problem of failure in the lubrication and oil supply process of the steam turbine during operation, and if there is suddenly no lubricating oil supply during the operation of the steam turbine, the AC screw pump and the DC screw pump will cooperate to ensure emergency oil supply and lubrication, avoiding shutdown caused by sudden damage of the screw pump and power outages, resulting in serious losses such as jamming and damage of the steam turbine due to lack of lubrication. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The utility model is a general principle diagram of a performance test device for a steam turbine gear machine.

[0017] Figure 2 The utility model discloses a schematic diagram of an AC screw pump and a DC screw pump in a performance test device for a steam turbine gear machine.

[0018] Figure 3 The utility model discloses a schematic diagram of a cooler and a duplex filter in a performance test device for a steam turbine gear machine.

[0019] Figure 4 The utility model discloses a schematic diagram of a first group of AC control and a second group of DC control in a performance test device for a steam turbine gear machine.

[0020] Figure 5 The utility model is a schematic diagram of an oil purifier and an oil tank 2 in a performance test device for a steam turbine gear machine.

[0021] Figure 6 This is the principle diagram of the exhaust centrifugal fan in the performance test device of the steam turbine gear machine of the utility model.

[0022] Figure 7 The utility model discloses a schematic diagram of a circulating pump of a performance test device for a steam turbine gear machine.

[0023] Figure 8 The block diagram of a performance test device for a steam turbine gear machine (valves and sensors are omitted).

[0024] The accompanying drawings are marked as follows: 1 is an AC screw pump; 2 is a DC screw pump; 3 is a circulating pump; 4 is a cooler; 5, 30, 31, 36, 43, 44 are butterfly valves; 6, 14, 39, 40 are stainless steel bellows; 7, 11 are clamp check valves; 8 is a check valve; 9 is a duplex filter; 10 is a temperature control valve; 12 is a smoke exhaust centrifugal fan; 13 is an oil purifier; 15 is a heater; 16 is an adjustable throttle valve; 18, 38 are ball valves; 19 is a turbine ball valve; 20 is a bimetallic thermometer; 21 is a temperature sensor; 22, 29 are pressure sensors; 23 is a pressure switch; 24 is a magnetic flap liquid level sensor; 25 is a flow sensor; 26, 28 are seismic-resistant pressure gauges; 27 is a needle method; 32 is a sampling method; 34 is a diffuser backflow valve; 41 is a solenoid valve; 42 is a throttle valve. The schematic diagram is for practical application, so different numbers are used to represent the same device in multiple places in the diagram only to distinguish the models in practical application. DETAILED DESCRIPTION

[0025] 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 only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in 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.

[0026] Example 1: Figure 1-8 As shown, a performance test device for a steam turbine gear machine is Figure 1 Because the overall schematic is a bit vague, Figure 2-7 The following is a detailed schematic diagram of each part. Figure 8 It is the overall block diagram and valves and sensors are omitted, where:

[0027] The self-operated regulating valve can adjust the pipeline pressure within the range of 0.3-0.5MPa.

[0028] The oil cooler adopts plate type oil cooler, and its heat exchange area is designed according to the conditions that the return temperature of lubricating oil is not more than 65℃ and the cooling water is not more than 30℃. The oil temperature control range of the oil cooler outlet is required to be 35℃~45℃, and a 20% margin is reserved for the cooling area. The oil cooler plate is 316L, and the clamping plate and bracket can be made of carbon steel; the oil cooler water inlet is equipped with a lubricating oil temperature regulating valve, and a hot and cold oil mixing regulating valve can also be set on the oil line to control the oil temperature of the oil supply main pipe at 35~45℃

[0029] The initial pressure drop of the lubricating oil filter is ≤0.035MPa. The pressure difference of the lubricating oil filter is controlled by switch quantity. When the pressure difference reaches the set value, an alarm signal is issued. The filtration accuracy of the lubricating oil filter is ≤25μm. It has the function of online replacement of filter elements (that is, duplex or has the function of duplex filter). The housing and filter element are both stainless steel.

[0030] The bottom of the oil tank should have a certain slope to facilitate oil discharge; the oil tank is equipped with interfaces for emergency oil discharge (discharged to the outdoor accident oil pool), sewage discharge, oil replenishment and connection to the purification device. The height of the interface connecting the top of the oil tank with the inside of the oil tank (manhole, oil inlet and outlet, etc.) is more than 10mm higher than the height of the side plate of the oil tank to prevent water from entering the inside of the oil tank through the top of the oil tank; the oil tank needs to be divided into two small oil tanks, connected by pipes to form a large oil tank. A guardrail is set on the top of the oil tank, and a maintenance ladder is set to climb onto the top of the oil tank; an electric heater is installed in the oil tank, and the power of the electric heater is sufficient to heat the lubricating oil in the oil tank to the required temperature for the test in about 4 hours (temperature rise is not less than 20℃). The two-position switch of the electric heater working state can select manual heating and automatic control. The oil tank temperature uses Pt100 and a local thermometer to measure and display the oil temperature, and two switch quantities are given to achieve three-position control of the oil temperature; when the oil tank temperature is lower than the lower limit setting value, the electric heater automatically heats, and automatically stops when it reaches the normal setting value; when the oil tank temperature is lower than the lower limit setting value, the oil pump cannot be started. The lower limit setting value and the lower limit setting value of the oil tank temperature shall be provided by the tenderer. The oil tank liquid level uses a magnetic flap liquid level transmitter to detect the oil tank liquid level, with 2 liquid level switches; when the oil level exceeds the limit, an alarm signal is issued, and the signal can be uploaded to the laboratory data acquisition system.

[0031] Three sets of AC screw pumps are used with a total flow rate of ≥500L / min and a nominal pressure of 14MPa. They can all be opened during operation, or two can be used and one can be used as a backup, or one can be used, one can be used and one can be used as a backup and the other can be stopped. A high-pressure plunger pump or vane pump is used, and the pump and the base are equipped with vibration isolators for vibration isolation. The pump inlet and outlet are equipped with stainless steel flexible pipes. An oil filter and accumulator are installed at the outlet of the AC screw pump to keep the oil supply clean and the pressure stable. The filtration accuracy of the filter element is 5μm, and an overflow valve is set as a safety valve of the system. An oil filter is installed in the return oil pipeline, and the filtration accuracy of the filter element is 10μm.

[0032] The flow rate of the DC screw pump is ≥1000L / min, and the nominal pressure is ≥0.3MPa; the pump casing is made of stainless steel and no vibration isolator is installed; when the AC screw pump fails or the oil pressure is low, the spare DC screw pump can start automatically.

[0033] An oil cooler is set in the circulation pump loop to ensure that the oil temperature in the oil tank is within the working temperature range. The oil cooler is made of stainless steel. The circulation pump transports oil from oil tank one to oil tank two, and oil tank two is connected to oil tank one, and then the oil is discharged from oil tank two to oil tank one.

[0034] The AC screw pump system is equipped with an independent local control box and a remote DCS control interface is reserved, including oil pump start instructions, stop instructions, operating status, stop status, oil pump failure, etc., and is equipped with necessary monitoring instruments such as the oil supply main pipe pressure gauge, pressure sensor, liquid level indicator (magnetic flap liquid level gauge with remote transmission function) and temperature sensor. This application only protects the structure, not the control system, and the control system belongs to the prior art.

[0035] The oil purification equipment adopts vacuum oil purifier with a processing capacity of ≥200L / min, which can remove 100% of free water and 95% of dissolved water in the oil. At the same time, the oil tank can be filled and drained through pipelines.

[0036] Fume exhaust device for oil tank: The oil tank is equipped with a set of fume exhaust device to ensure that the negative pressure of the oil tank is -0.5kPa during operation. The pipe outside the exhaust room needs to be set up to ensure that rainwater cannot enter the oil tank and rainproof measures are required.

[0037] The oil supply port uses a pressure transmitter to detect the oil supply pressure, which displays the pressure locally and transmits the pressure signal to the superior control system; the oil supply main pipe pressure transmitter controls the start and stop of the standby pump. When the pressure is lower than the set value, the standby pump automatically starts and sends out an alarm signal; the oil supply main pipe is equipped with 3 sets of standby pressure switches for use by the upper system.

[0038] The DC emergency lubricating oil pump (i.e. DC screw pump) can automatically start in an emergency when the lubricating oil system loses AC380V, 50Hz AC power. Its DC emergency control system should be able to ensure that the DC emergency oil pump starts quickly after receiving the start signal.

[0039] Example 2: Figure 1-7 As shown, the working principle of a performance test device for a steam turbine gear machine:

[0040] 1. The three-position standby pump selection knob in the electric control box is Pump 1, Pump 2, and Pump 3. The pump you switch to is the standby pump. And set a separate start and stop button for each pump. The standby pump panel start / stop is invalid (for example, when switching to Pump 1 as a standby, the separate start and stop button for Pump 1 does not work).

[0041] 2. The three AC screw pumps need to be set up with startup protection. The three AC screw pumps are set with protection locks according to the oil tank temperature. When the oil tank temperature is lower than the set value (25°C), the start buttons of the three AC screw pumps are interlocked (failed). At this time, if they want to work, they need to manually start the oil tank heater to preheat the oil temperature; this lock only works when the main oil supply pump is initially started. Once it is started, it should be ensured that the operating status is no longer related to the oil temperature;

[0042] 3. Set the two-position switch of the electric heater working state, and you can choose between manual heating and automatic control. The oil tank temperature uses Pt100 to measure the oil temperature and gives two switch values ​​to achieve three-position control of the oil temperature.

[0043] When heating manually: the panel heater button needs to be manually started, and the circulation pump needs to be started at the same time. The circulation pump is used to circulate the oil in the oil tank. When the heating temperature reaches the set value, the heater automatically stops (protection). However, the circulation pump needs to be stopped manually; during the heating process, the heater can be stopped manually at any time; (manual heating temperature upper limit protection setting value: 60℃)

[0044] Automatic heating: When the lubrication system starts to work, the heating selection switch can be selected to the automatic heating state; at this time, the heater can automatically start / stop according to the oil tank set temperature in the automatic heating state, that is, when the temperature is lower than the lower limit setting value, the electric heater automatically starts heating, and automatically stops when it reaches the stop setting value; automatic heating temperature range (35℃ start, 45℃ stop heating)

[0045] 4. The oil tank liquid level adopts a magnetic flap liquid level transmitter to detect the oil tank liquid level, with 2 liquid level switches; when the oil level exceeds the limit, an alarm signal is issued; analog signal requires reserved remote transmission terminals.

[0046] 5. The oil supply main pipe is equipped with 2 sets of pressure detection devices. Each set of detection devices consists of 3 pressure switches, 1 pressure sensor and a test valve. The pressure switch group is used to control the start and stop of the standby pump and the emergency pump. The pressure sensor is used to display the pressure of the oil supply main pipe. This pressure also needs to be set with a remote transmission terminal;

[0047] Function introduction of the first group of detection devices: When the oil supply pressure drops to 0.2Mpa (when two or more pressure switches reach 0.2MPA at the same time), the AC standby pump starts automatically.

[0048] Function introduction of the second group of detection devices: When the oil supply pressure continues to drop to 0.15Mpa (when two or more pressure switches reach 0.15MPA at the same time), the DC emergency oil pump starts automatically.

[0049] When the oil supply pressure drops to 0.3-0.5Mpa (adjusted according to actual needs), the AC standby pump starts automatically. When the oil supply pressure continues to drop to 0.25-0.45Mpa (adjusted according to actual needs), the DC emergency oil pump starts automatically. At the same time, when the AC lubricating oil pump group is powered off, the DC emergency oil pump can also start automatically.

[0050] The two sets of switches for automatically starting the oil pump need to be set with a delay to avoid misoperation. The delay time can be adjusted according to the actual situation.

[0051] When the AC screw pump group loses power (pump 1, pump 2, pump 3 all lose AC 380V) or the control cabinet loses power at 380V AC, the DC emergency oil pump automatically starts. Its DC emergency control system should be able to ensure that the control oil pump starts quickly after receiving the start signal.

[0052] 6. AC standby start-up test: when the AC pressure switch group 1 is put into operation, the two-position two-way valve is energized to test whether the AC standby pump starts automatically. Exit after the test.

[0053] 7. DC startup test: when the DC pressure switch group 2 is put into operation, the two-position two-way valve is energized, and the DC standby pump starts automatically. Exit after the test.

[0054] 8. Test the DC power supply after AC power failure, control the total AC 380V power failure, and test whether the DC emergency oil pump starts automatically. After the test, the AC power needs to be re-supplied.

[0055] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. A performance test device for a steam turbine gear machine, characterized in that: The performance test device of the steam turbine gear machine comprises an AC screw pump (1), a DC screw pump (2), a circulation pump (3), a cooler (4), a duplex filter (9), a smoke exhaust centrifugal fan (12), an oil purifier (13) and a heater (15). Three AC screw pumps (1) are arranged in oil tank 1. The output pipelines of the three AC screw pumps (1) are connected to the oil supply main pipe through clamp check valves (7) and stainless steel bellows respectively. The branch pipes leading out of the oil supply main pipe are provided with self-operated regulating valves (17) and overflow valves (34). The oil supply mother pipe is connected to the input end of the cooler (4); the branch pipe leading out of the input end of the cooler (4) and the oil supply mother pipe at the output end are respectively connected to the two input ends of the temperature control valve (10); the output end of the temperature control valve (10) is connected to the input end of the duplex filter (9) through the oil supply mother pipe; the output end of the duplex filter (9) is connected to the flow sensor (25) through the oil supply mother pipe and the check valve (8); the input end of the DC screw pump (2) is connected to the oil tank 1 through the oil suction pipeline; the output pipeline of the DC screw pump (2) is connected to the oil supply pipeline at the output end of the duplex filter (9) through the clamp check valve 2 (11) and the stainless steel bellows; A first group of AC controls and a second group of DC controls are respectively connected to the oil supply main pipe between the check valve (8) and the flow sensor (25); a throttle valve (42), three pressure switches (23), a pressure sensor (22) and a solenoid valve (41) are respectively connected to the pipelines leading out of the first group of AC controls and the second group of DC controls; the first group of AC controls controls the operation of the three AC screw pumps, and the second group of DC controls controls the operation of the DC screw pump; Oil tank one is connected to oil tank two via a stainless steel bellows, oil tank one is connected to an oil purifier (13) via an oil pipeline and then discharged into oil tank two via the oil pipeline, a smoke exhaust pipeline is arranged in oil tank two and connected to an oil smoke exhaust interface via a smoke exhaust centrifugal fan (12); a heater (15) is arranged in both oil tank one and oil tank two, an input pipeline of a circulating pump (3) is connected to oil tank one, and an output pipeline of the circulating pump (3) is connected to oil tank two.

2. The performance test device for a steam turbine gear machine according to claim 1, characterized in that: The water outlet and water inlet of the cooler (4) are both provided with a pressure sensor and a temperature sensor.

3. The performance test device for a steam turbine gear machine according to claim 1, characterized in that: Branch pipes are led out from the pipelines between the clamp check valve (7) and the three AC screw pumps (1) to provide stop valves and stainless steel anti-vibration pressure gauges (28).

4. The performance test device for a steam turbine gear machine according to claim 1, characterized in that: A magnetic flap liquid level sensor (24) is arranged in the first oil tank, a bimetallic thermometer (20) and a temperature sensor (21) are arranged on the first oil tank, and a bimetallic thermometer (20) is arranged on the second oil tank.

5. The performance test device for a steam turbine gear machine according to claim 1, characterized in that: A butterfly valve (31) is provided on the oil suction pipeline.

6. The performance test device for a steam turbine gear machine according to claim 1, characterized in that: The refueling port of the second oil tank is refueled through a filtering device.

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