Cooling structure for high-pressure fire-resistant oil

Abstract

The utility model discloses a cooling structure for high-pressure fire-resistant oil. A compressed air pipeline is arranged at the side part of a fire-resistant oil tank; the compressed air pipeline comprises a first compressed air pipeline body, a throttling valve, a pressure reducing valve, an air filter, an air dryer and a second compressed air pipeline body which are sequentially connected, the first compressed air pipeline body is connected with external compressed air equipment, and the second compressed air pipeline body is connected with the fire-resistant oil tank. The external oil filter of the high-pressure fire-resistant oil system is adopted to circularly cool high-pressure fire-resistant oil, and meanwhile, continuous dry air is injected into the high-pressure fire-resistant oil tank, so that water-containing air is prevented from entering the oil tank to ensure that the interior of the oil tank is dry, the cooling function of the high-pressure fire-resistant oil is redundant, the water content of the high-pressure fire-resistant oil is reduced, and the service life of the high-pressure fire-resistant oil is prolonged. Hydrolysis degradation of the high-pressure fire-resistant oil is avoided, the service life is prolonged, and stable operation of a turboset speed regulating system is improved.

Description

Technical Field

[0001] The utility model relates to a field, in particular to a cooling structure for high-pressure fire-resistant oil. Background Art

[0002] The high-pressure fire-resistant oil servo adjustment system of the high-temperature and high-pressure steam turbine generator set has high requirements for oil quality. In order to ensure the quality index of high-pressure fire-resistant oil, an external oil filter is generally equipped. The oil station equipped with high-pressure fire-resistant oil is arranged in the steam turbine plant. The temperature of the steam turbine plant is high all year round. In summer working conditions, the ambient temperature can reach 40℃. High-pressure fire-resistant oil has high temperature requirements, and the operating range is 30-55℃. Excessive temperature will deteriorate the oil quality and cause corrosion to the entire high-pressure fire-resistant oil system. Fire-resistant oil stations generally show insufficient cooling capacity when operating in summer conditions. The operation of the external oil filter will cause the oil temperature to increase by 3-5℃. In this case, the oil temperature in summer conditions often exceeds the use requirements, resulting in oil quality deterioration. At the same time, the circulating oil filtration of the external oil filter will increase the throughput of the air filter installed in the high-pressure fire-resistant oil tank. As the air throughput increases, air with water vapor will enter the high-pressure fire-resistant oil tank. The change in temperature will cause the water vapor in the air to condense and enter the fire-resistant oil, resulting in an increase in the water content of the high-pressure fire-resistant oil and hydrolysis deterioration.

[0003] Therefore, it is necessary to develop a cooling structure for high-pressure fire-resistant oil in a targeted manner to circulate and cool the high-pressure fire-resistant oil to prevent water-containing air from entering the oil tank and ensure that the inside of the oil tank is dry. Utility Model Content

[0004] Purpose of the utility model: In view of the shortcomings and defects of the prior art, the utility model provides a cooling structure for high-pressure fire-resistant oil, which adopts an external oil filter of the high-pressure fire-resistant oil system to circulate and cool the high-pressure fire-resistant oil. At the same time, continuous dry air is injected into the high-pressure fire-resistant oil tank to prevent water-containing air from entering the tank to ensure the dryness of the inside of the tank, so that the cooling function of the high-pressure fire-resistant oil is redundant, the water content of the high-pressure fire-resistant oil is reduced, the hydrolysis and deterioration of the high-pressure fire-resistant oil is avoided, the service life is extended, and the stable operation of the turbine unit speed control system is improved.

[0005] Technical solution: The utility model is a cooling structure for high-pressure fire-resistant oil, characterized in that a compressed air pipeline is arranged on the side of the fire-resistant oil tank; the compressed air pipeline comprises a compressed air pipeline 1, a throttle valve, a pressure reducing valve, an air filter, an air dryer and a compressed air pipeline 2 which are connected in sequence, the compressed air pipeline 1 is connected to an external compressed air device, and the compressed air pipeline 2 is connected to the fire-resistant oil tank.

[0006] The fire-resistant oil tank is provided with an oil suction pipeline, a temperature transmitter, an oil pump, a fine filter and a water cooler which are connected in sequence.

[0007] Among them, an inlet ball valve is arranged between the oil suction pipeline and the temperature transmitter, an oil suction coarse filter is arranged between the temperature transmitter and the oil pump, the oil pump is connected in parallel with the safety valve, and a motor is arranged on the side of the oil pump.

[0008] Among them, a sampling port, a pressure gauge, and a filter pipe are arranged between the oil pump and the fine filter, and the fine filter is arranged in parallel with a pressure difference transmitter, a visual pressure difference transmitter, and a bypass valve.

[0009] Wherein, a cooling pipeline is arranged between the fine filter and the water cooler, and a reflux pipeline and an outlet ball valve are arranged between the water cooler and the fire-resistant oil tank.

[0010] Wherein, the water cooler is provided with a water inlet pipe and a water return pipe, and the water return pipe is provided with an electromagnetic water valve.

[0011] Beneficial effects: Compared with the prior art, the utility model has the following significant advantages: the utility model adopts an external oil filter of the high-pressure fire-resistant oil system to circulate and cool the high-pressure fire-resistant oil, and at the same time continuously injects dry air into the high-pressure fire-resistant oil tank to prevent water-containing air from entering the oil tank to ensure the dryness inside the oil tank, so that the high-pressure fire-resistant oil cooling function is redundant, the water content of the high-pressure fire-resistant oil is reduced, the hydrolysis and deterioration of the high-pressure fire-resistant oil is avoided, the service life is extended, and the stable operation of the turbine unit speed control system is improved.

[0012] The utility model can realize automatic activation and removal of the cooling function according to the oil inlet temperature, thereby ensuring that the fire-resistant oil operates within a reasonable temperature range, and at the same time limiting the water content brought into the oil tank by air throughput due to the increase in the circulation volume of the high-pressure fire-resistant oil, thereby avoiding the corrosion of the system caused by the deterioration of oil quality due to the hydrolysis of the fire-resistant oil due to the high temperature and water content, and improving the stability of the operation of the generator set. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the structure of the utility model;

[0014] In the figure, 1 is an oil suction pipeline; 2 is a temperature transmitter; 3 is an oil pump; 4 is a fine filter; 5 is a water cooler; 6 is an inlet ball valve; 7 is an electromagnetic water valve; 8 is an oil suction coarse filter; 9 is a safety valve; 10 is a filter pipeline; 11 is a pressure difference transmitter; 12 is a cooling pipeline; 13 is a return pipeline; 14 is an outlet ball valve; 15 is a water inlet pipeline; 16 is a return water pipeline; 17 is a compressed air pipeline 1; 18 is a throttle valve; 19 is a pressure reducing valve; 20 is an air filter; 21 is an air dryer; 22 is a compressed air pipeline 2. DETAILED DESCRIPTION

[0015] The technical solution of the utility model is further described below in conjunction with the accompanying drawings and specific implementation methods.

[0016] The cooling structure of high-pressure fire-resistant oil of the utility model is provided with a compressed air pipeline on the side of the fire-resistant oil tank; the compressed air pipeline includes a compressed air pipeline 17, a throttle valve 18, a pressure reducing valve 19, an air filter 20, an air dryer 21 and a compressed air pipeline 22 connected in sequence, the compressed air pipeline 17 is connected to an external compressed air device, and the compressed air pipeline 22 is connected to the fire-resistant oil tank. Among them, the fire-resistant oil tank is provided with an oil suction pipeline 1, a temperature transmitter 2, an oil pump 3, a fine filter 4 and a water cooler 5 connected in sequence. An inlet ball valve 6 is provided between the oil suction pipeline 1 and the temperature transmitter 2, an oil suction coarse filter 8 is provided between the temperature transmitter 2 and the oil pump 3, the oil pump 3 is connected in parallel with the safety valve 9, and a motor is provided on the side of the oil pump 3. A sampling port, a pressure gauge, and a filter pipeline 10 are provided between the oil pump 3 and the fine filter 4, and the fine filter 4 is provided in parallel with the pressure difference transmitter 11, the visual pressure difference transmitter, and the bypass valve. A cooling pipe 12 is provided between the fine filter 4 and the water cooler 5, and a return pipe 13 and an outlet ball valve 14 are provided between the water cooler 5 and the fire-resistant oil tank. The water cooler 5 is provided with a water inlet pipe 15 and a water return pipe 16, and the water return pipe 16 is provided with an electromagnetic water valve 7.

[0017] The cooling structure of the high-pressure fire-resistant oil of the utility model, when in use, the oil pump 3 sucks oil from the fire-resistant oil tank, and a temperature transmitter 2 is installed in the oil suction circuit, and the monitored temperature is sent to the external PLC control system as a feedback signal. The fire-resistant oil will first pass through the oil suction coarse filter 8, and then be transported to the outlet fine filter 4 through the oil pump 3, and after fine filtration, it will return to the fire-resistant oil tank through the water cooler 5. When the temperature transmitter 2 detects that the temperature of the sucked fire-resistant oil is higher than 57°C, the PLC will control the electromagnetic water valve 7 on the return water circuit of the water cooler 5 to open, and conduct the cooling water circuit to cool and exchange heat for the fire-resistant oil. When the oil temperature of the fire-resistant oil drops to 37°C, the PLC control system issues a command to close the electromagnetic water valve 7, and the cooling water circuit cuts off the heat exchange of the oil cooler. The dynamic balance of the system heat exchange temperature control is achieved, and the purpose of stabilizing the temperature of the fire-resistant oil tank is achieved. At the same time, a dry air circuit is added to replenish the high-pressure fire-resistant oil tank. The compressed air first passes through the throttle valve 18 to limit the flow of compressed air entering, and then passes through the pressure reducing valve 19 to reduce the pressure, and flows into the air filter 20 to remove dust, oil stains and other impurities in the gas, and then passes through the air dryer 21. The treated over-dried air enters the high-pressure fire-resistant oil tank from the top of the tank, so that the inside of the high-pressure fire-resistant oil tank maintains a slight positive pressure. After the over-dried air contacts the fire-resistant oil, it will reach a new dryness and humidity balance, take away the water vapor in the oil, and reduce the water content. At the same time, the slightly positive pressure tank will hinder the external wet air caused by the oil circulation of the external oil filter and the air intake and exhalation of the tank into the tank. The oil temperature and water content of the fire-resistant oil inside the high-pressure fire-resistant oil tank are well controlled, which slows down the deterioration of the oil quality and provides the operation stability of the system.

Claims

1. A cooling structure for high-pressure fire-resistant oil, characterized in that: A compressed air pipeline is arranged on the side of the fire-resistant oil tank; the compressed air pipeline comprises a compressed air pipeline 1 (17), a throttle valve (18), a pressure reducing valve (19), an air filter (20), an air dryer (21) and a compressed air pipeline 2 (22) which are connected in sequence; the compressed air pipeline 1 (17) is connected to an external compressed air device, and the compressed air pipeline 2 (22) is connected to the fire-resistant oil tank.

2. The cooling structure of high pressure fire-resistant oil according to claim 1, characterized in that: The fire-resistant oil tank is provided with an oil suction pipeline (1), a temperature transmitter (2), an oil pump (3), a fine filter (4) and a water cooler (5) which are connected in sequence.

3. The cooling structure of high pressure fire-resistant oil according to claim 2, characterized in that: An inlet ball valve (6) is provided between the oil suction pipeline (1) and the temperature transmitter (2), an oil suction coarse filter (8) is provided between the temperature transmitter (2) and the oil pump (3), the oil pump (3) is connected in parallel with the safety valve (9), and a motor is provided on the side of the oil pump (3).

4. The cooling structure of high pressure fire-resistant oil according to claim 3 is characterized in that: A sampling port, a pressure gauge, and a filter pipe (10) are provided between the oil pump (3) and the fine filter (4); the fine filter (4) is connected in parallel with a pressure differential transmitter (11), a visual pressure differential transmitter, and a bypass valve.

5. The cooling structure of high pressure fire-resistant oil according to claim 4, characterized in that: A cooling pipe (12) is provided between the fine filter (4) and the water cooler (5), and a return pipe (13) and an outlet ball valve (14) are provided between the water cooler (5) and the fire-resistant oil tank.

6. The cooling structure of high pressure fire-resistant oil according to claim 5, characterized in that: The water cooler (5) is provided with a water inlet pipe (15) and a water return pipe (16), and the water return pipe (16) is provided with an electromagnetic water valve (7).

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