CN106286790B - A kind of heat dissipating method of combined radiating device for wind-power electricity generation reduction gear box - Google Patents

Abstract

The invention discloses a combined heat dissipation device and method for a reduction gear box of wind power generation, which comprises a gear oil tank connected in sequence, an oil outlet stop valve, an electric hydraulic pump, a fine filter, a coarse filter, a temperature control valve, and an oil return stop valve , the oil return cut-off valve is connected to the gearbox to form a circuit; both ends of the electric hydraulic pump are connected in parallel with high-pressure safety valves, both ends of the fine filter are connected in parallel with medium-pressure safety valves, both ends of the fine filter and coarse filter are connected in parallel with differential pressure relays, temperature control valves and return valves There is a pressure gauge between the oil cut-off valve; the main cooling device and the auxiliary cooling device are connected between the oil outlet of the coarse filter and the inlet of the oil return shut-off valve; Water pump, radiator; there are temperature sensors and flow sensors in the water outlet pipeline, and the cooling fan acts on the radiator; the control unit controls the electric water pump and cooling fan in real time according to the sensor data information; the present invention adopts two independent main/auxiliary cooling devices, Downshifting and stalling issues resolved.

Description

A heat dissipation method for a combined heat dissipation device for a wind power generation reduction gearbox

technical field

The invention relates to the field of wind power generating sets, in particular to a combined heat dissipation device and method for a reduction gear box for wind power generation.

Background technique

Wind power can become an important part of China's power supply structure, and the development of wind power is conducive to the adjustment of energy structure. At present, 75% of China's power supply structure is coal power, which causes serious pollution. It is urgent to increase the proportion of clean power sources such as wind power. Especially in reducing greenhouse gas emissions such as carbon dioxide and mitigating global warming, wind power is one of the effective measures. In the long run, China's per capita conventional energy resources are relatively small. In order to maintain sustainable economic and social development, measures must be taken to solve energy supply.

Wind power generation is the use of wind energy to generate electricity, and wind turbines are machines that convert wind energy into electrical energy. The wind rotor is the most important part of the wind turbine, consisting of blades and hubs. The blade has a good aerodynamic shape. Under the action of the airflow, it can generate aerodynamic force to rotate the wind wheel, convert the wind energy into mechanical energy, and then drive the generator through the gear box to increase the speed, and convert the mechanical energy into electrical energy.

Compared with other power generation methods, wind power generation has certain advantages: (1) Wind power generation is a clean and pollution-free renewable natural resource, which is inexhaustible and has no conventional energy sources (coal power, oil power, nuclear power) will cause environmental pollution; (2) wind power technology is becoming more and more mature, the product quality is reliable, and the energy utilization rate is over 95%; (3) economic benefits are increasing day by day, and the cost of power generation is low.

At the same time, wind power also has some disadvantages: (1) Loud noise and visual pollution, it needs to be built in a sparsely populated area with high wind energy; (2) Occupies a large area of land; (3) Wind energy is unstable and uncontrollable; (4) The current cost (5) It affects the life of birds; (6) The key technology still needs to be vigorously developed, especially the downshifting and shutdown of wind turbines in the wind power reduction gearbox in summer: because the temperature of the gear oil is too high, the wind turbine sets the gear Downshift when the oil temperature exceeds 75°C, and stop when the oil temperature exceeds 90°C.

Contents of the invention

The purpose of the present invention is to solve the problem of downshifting and shutting down of wind turbines in summer for wind power generation reduction gearboxes, and provides a combined heat dissipation device and method for wind power generation reduction gearboxes, which solves the problem that the existing heat dissipation system cannot The problem of meeting the heat dissipation requirements effectively enables the device to operate normally under high temperature conditions.

The technical scheme adopted in the present invention is:

A combined heat dissipation device for wind power reduction gear box, including gear oil tank, oil outlet stop valve, electro-hydraulic oil pump, high pressure safety valve, fine filter, medium pressure safety valve, coarse filter, first radiator, oil return stop Valve, heat exchange water tank, electric water pump, second radiator, control unit;

The oil inlet port of the oil outlet shut-off valve is connected to the oil outlet port of the gear oil tank, the oil outlet port of the oil outlet shut-off valve is connected to the oil inlet port of the electro-hydraulic oil pump, and the high-pressure safety valve is connected to the electro-hydraulic pump. Two ends of the oil pump, the oil outlet of the electric hydraulic oil pump is connected to the oil inlet of the fine filter, the medium pressure safety valve is connected to both ends of the fine filter, the oil outlet of the fine filter is connected to the inlet of the coarse filter The oil port is connected, the oil outlet of the coarse filter is connected to the oil inlet of the first radiator, the oil outlet of the first radiator is connected to the oil inlet of the heat exchange water tank, and the oil outlet of the heat exchange water tank The oil return port is connected to the oil inlet of the oil return cut-off valve, and the oil outlet of the oil return stop valve is connected to the oil inlet of the gear oil tank to form an oil circuit; the inside of the heat exchange tank is connected to the oil inlet and outlet through pipelines Oil port; the body of the heat exchange water tank is also provided with a water inlet and a water outlet, the inside of the heat exchange water tank is filled with cooling water; the water outlet is connected to the water inlet of the electric water pump through a pipeline, and the water outlet of the electric water pump is connected to the The water inlet of the second radiator and the water outlet of the second radiator are connected to the water inlet of the heat exchange water tank to form a cooling water circuit;

Both the electric hydraulic oil pump and the electric water pump are connected to a control unit through a signal line; the control unit is used to control the speed of the electric hydraulic pump and the speed of the electric water pump.

Further, it also includes a first temperature sensor, a first flow sensor, a first electric cooling fan, a second temperature sensor, a second flow sensor, and a second electric cooling fan;

The first temperature sensor and the first flow sensor are arranged in the pipeline at the oil inlet of the first radiator, and the first electric cooling fan acts on the first radiator to assist heat dissipation; the first temperature The sensor, the first flow sensor, and the first electric cooling fan are all connected to the control unit; the control unit adjusts the speed of the first electric cooling fan in real time according to the information of the first temperature sensor and the first flow sensor;

The second temperature sensor and the second flow sensor are arranged in the pipeline at the water outlet of the heat exchange tank, and the second electric cooling fan acts on the second radiator to assist heat dissipation; the second temperature sensor, Both the second flow sensor and the second electric cooling fan are connected to the control unit; the control unit adjusts the speed of the second electric cooling fan and the electric water pump in real time according to the information of the second temperature sensor and the second flow sensor .

Further, a differential pressure relay is also included, and the differential pressure relay is connected in parallel at the two ends of the fine filter and the coarse filter in series, and is used to monitor the working status of the two ends of the fine filter and the coarse filter in series, and whether the pressure is abnormal.

Further, a pressure gauge is also included, and the pressure gauge is arranged on the pipeline at the inlet end of the oil return stop valve.

Further, a temperature control valve is also included, and the temperature control valve is connected between the coarse filter and the oil return cut-off valve.

Further, the oil outlet shut-off valve and the gear oil tank are connected through a cooling oil pipe; between the oil outlet shut-off valve and the electric hydraulic pump, between the electric hydraulic pump and the fine filter, between the Both the fine filter and the coarse filter are connected by pipelines.

Further, the pipeline inside the heat exchange tank is curved.

According to the device, the present invention also proposes a heat dissipation method, including the following:

The cooling device is divided into 4 working modes according to the cooling lubricating oil graduation: low temperature, high pressure, medium/low pressure, high temperature; specifically:

(a) Before each start-up, start the lubrication and cooling device of the power generation system first, and then start the gearbox after the lubrication points are fully lubricated; when the system is in a low-temperature cold start state, first pass through the heating device in the gearbox, Warm up the gear oil before starting the machine.

(b) The temperature of the gear oil is low when the machine is just started, and the viscosity of the gear oil is high, which causes the pressure in the system to rise, and the device is in a high-pressure state. In this state, the gear oil directly forms a circuit with the electric hydraulic oil pump through the high-pressure safety valve, accelerating the gear oil. The circulation makes the oil temperature rise rapidly and reduces the pressure in the device;

(c) With the circulation of the gear oil, the temperature of the gear oil continues to rise, the pressure in the pipeline gradually decreases, and the device works in a medium/low pressure state. In this state, the high pressure safety valve is automatically closed, and the medium pressure safety valve is automatically opened. Part of the oil flows back to the gear oil tank through the oil outlet shut-off valve, electro-hydraulic oil pump, fine filter, coarse filter, temperature control valve, and oil return shut-off valve in turn, and the other part flows back to the gear oil tank after passing through the first radiator and heat exchange water tank;

(d) When the temperature of the gear oil rises further, the device works in the medium/low pressure state. In this state, the medium pressure safety valve is automatically closed, and the gear oil flows back to the gear oil tank after passing through the two-stage filter to form a circuit; As the temperature rises, the flow rate of the electric hydraulic oil pump increases;

(e) After the system has been running for a long time, the temperature of the gear oil is at a high temperature. In this state, the temperature control valve is closed. The excess heat is transferred to the cooling water in the exchange water tank, and the cooled oil returns to the gear oil tank through the oil outlet and the oil return cut-off valve to realize oil cooling.

Further, said (e) also includes:

The first temperature sensor and the first flow sensor collect the pipeline oil temperature and flow rate, and transmit the data to the control unit, and the control unit adjusts the working state of the first electric cooling fan in real time to accelerate or decelerate the heat dissipation of the first radiator;

The cooling water temperature and flow are collected by the second temperature sensor and the second flow sensor, and the data are transmitted to the control unit, and the control unit adjusts the working status of the electric water pump and the second electric cooling fan in real time to accelerate or decelerate the heat dissipation of the second radiator .

The beneficial effects of the present invention are:

(1) The cooling water in the heat exchange water tank of the auxiliary heat dissipation device has increased compared with the air-cooled heat capacity of the original heat dissipation system, which improves the heat dissipation capacity of the auxiliary heat dissipation system;

(2) The auxiliary heat dissipation system composed of heat exchange water tank, electric water pump and second radiator has independent heat dissipation components, and is easy to install on the wind turbine unit without changing the structure and working principle of the original heat dissipation system;

(3) There is no interaction between the auxiliary cooling system and the original cooling system, and the original cooling system can still maintain the original cooling capacity.

Description of drawings

Figure 1 is a structural schematic diagram of a combined cooling device for a wind power generation reduction gearbox

Fig. 2 is a schematic diagram of the heat flow of the combined cooling device working state 2 of the wind power reduction gearbox

Fig. 3 is a schematic diagram of the heat flow of the combined cooling device working state 3 of the wind power reduction gearbox

Figure 4 is a schematic diagram of the heat flow of the combined heat dissipation system working state 4 of the wind power reduction gearbox

In the figure: 1-gear oil tank, 2-oil outlet valve, 3-electric hydraulic oil pump, 4-high pressure safety valve, 5-fine filter, 6-medium pressure safety valve, 7-coarse filter, 8-pressure differential relay, 9-temperature control valve, 10-oil return cut-off valve, 11-pressure gauge, 12-first temperature sensor, 13-first flow sensor, 14-first radiator, 15-first electric cooling fan, 16-heat Exchange water tank, 17-second temperature sensor, 18-second flow sensor, 19-electric water pump, 20-second radiator, 21-second electric cooling fan, 22 control unit.

Detailed ways

The structure and working principle of the auxiliary heat dissipation system for wind power generation reduction gearboxes involved in the present invention will be described in detail below with reference to the accompanying drawings.

As shown in Figure 1, the combined cooling device proposed by the present invention includes a gear oil tank 1, an oil outlet shut-off valve 2, an electric hydraulic oil pump 3, a high-pressure safety valve 4, a fine filter 5, a medium-pressure safety valve 6, a coarse filter 7, a differential pressure Relay 8, temperature control valve 9, oil return cut-off valve 10, pressure gauge 11, first temperature sensor 12, first flow sensor 13, first radiator 14, first electric cooling fan 15, heat exchange water tank 16, second A temperature sensor 17 , a second flow sensor 18 , an electric water pump 19 , a second radiator 20 , a second electric cooling fan 21 , and a control unit 22 .

The oil inlet of the oil outlet shut-off valve 2 is connected with the oil outlet of the gear oil tank 1 with a cooling oil pipe, the oil outlet of the oil outlet shut-off valve 2 is connected with the oil inlet of the electric hydraulic oil pump 3, and the high-pressure safety valve 4 is connected with the electric hydraulic oil pump 3 At both ends, the oil outlet of the electro-hydraulic oil pump 3 is connected to the oil inlet of the fine filter 5, the medium pressure safety valve 6 is connected to both ends of the fine filter 5, and the oil outlet of the fine filter 5 is connected to the oil inlet of the coarse filter 7 A differential pressure relay 8 is connected in parallel on both sides of the fine filter 5 and the coarse filter 7, the oil outlet of the coarse filter 7 is connected to the oil inlet of the temperature control valve 9, and the oil outlet of the temperature control valve 9 is connected to the oil inlet of the oil return stop valve 10, A pressure gauge 11 is arranged in the pipeline at the oil inlet of the oil return stop valve, and the oil outlet of the oil return stop valve 10 is connected to the oil return port of the gear oil tank 1 to form an oil circuit. The oil outlet of the coarse filter 7 also passes through the first temperature sensor 12 and the first flow sensor 13, connects the oil inlet of the first radiator 14, and connects the oil inlet of the heat exchange water tank 16 after the first electric cooling fan 15 radiates heat. The oil outlet of the exchange water tank 16 is connected to the oil inlet of the oil return stop valve 10 . The oil pipeline inside the heat exchange water tank is curved, and the tank body is provided with a water inlet and a water outlet. The water outlet of the heat exchange water tank 16 is connected to the electric water pump through the second temperature sensor 17 and the second flow sensor 18 19 water inlet, the water outlet of the electric water pump 19 is connected to the water inlet of the second radiator 20, and is connected to the water inlet of the heat exchange water tank 16 after the second electric cooling fan 21 dissipates heat to form a cooling water circuit.

Wherein, the main cooling device is composed of the first temperature sensor, the first flow sensor, the first radiator and the first electric cooling fan; the heat exchange water tank, the second temperature sensor, the second flow sensor, the electric water pump, the second radiator , The second electric cooling fan forms an auxiliary cooling device.

The electric hydraulic oil pump 3, the first temperature sensor 12, the first flow sensor 13, the first electric cooling fan 15, the second temperature sensor 17, the second flow sensor 18, the electric water pump 19, and the second electric cooling fan 21 all pass through signal lines Data connection with the control unit 22 . The control unit controls the rotating speed of the electric hydraulic oil pump 3 to control the oil output, and the control unit also controls the rotating speed of the first electric cooling fan 15 according to the information collected by the first temperature sensor 12 and the first flow sensor 13. The rotation speed of the electric water pump and the rotation speed of the second electric cooling fan are controlled according to the information collected by the second temperature sensor 17 and the second flow sensor 18 . The control unit is realized by the upper computer.

The control method of the auxiliary heat dissipation system used for the reduction gear box for wind power generation according to the present invention will be specifically described below in conjunction with the accompanying drawings.

The combined heat dissipation device of the wind power reduction gearbox is divided into 4 working modes according to the cooling lubricating oil graduation: 1. Low temperature 2. High pressure 3. Medium/low pressure 4. High temperature

The system requires that the lubricating and cooling device of the power generation system must be started before each start-up, and the gearbox should be started to work after all lubricating points are fully lubricated. When the system is in the low-temperature cold start state, the gear oil is heated through the heating device in the gear box (composed of the electric hydraulic oil pump 3 and the high-pressure safety valve 4), and then the machine is started.

As shown in Figure 2, the joint cooling device is in working state 2, and the system is under high pressure. In the embodiment of the present invention, the high pressure is greater than 10 bar. Since the temperature of the gear oil is low when the machine is just started, the viscosity of the gear oil is high, resulting in internal pressure in the system. As the gear oil rises, the gear oil will not flow through the fine filter, and only directly forms a circuit with the electric hydraulic oil pump 3 through the high-pressure safety valve 4 to accelerate the circulation of the gear oil, so that the oil temperature will rise rapidly and the pressure of the system will be reduced.

As shown in Figure 3, the working state of the heat dissipation system is 3. With the circulation of the gear oil, the temperature of the gear oil continues to rise, and the pressure in the pipeline gradually decreases. When the pressure drops below 10 bar, the high-pressure safety valve 4 is automatically closed, and the medium-pressure safety valve 6 is automatically opened. On the one hand, the gear oil flows back to the gear box through the medium pressure safety valve 6, the coarse filter 7, the temperature control valve 9, and the oil return stop valve 10 to form a circuit;

When the temperature of the gear oil rises further, the pressure continues to decrease, and when the pressure is less than 3bar, the pipeline is in a medium/low pressure state. The medium pressure safety valve 6 is automatically closed, and the gear oil flows back to the gearbox after passing through the two-stage filter to form a circuit. If the oil temperature at this moment increases, the flow rate of the electrohydraulic oil pump 3 increases.

After the system has been running for a long time, the oil temperature of the gear oil is at a high temperature. The gear oil must be cooled. As shown in Figure 4, the combined heat sink of the present invention is in working state 4. At this time, the temperature exceeds the threshold value of the temperature control valve 9 (70 degrees in the embodiment of the present invention), the temperature control valve 9 is closed, and the gear oil passes through the two-stage filter first. After filtering, first enter the main cooling device, the first temperature sensor 12 and the first flow sensor 13 collect the oil temperature and flow rate, and transmit the data to the control unit 22, and the control unit 22 controls the first electric cooling fan 15 in the first radiator. 14 for heat dissipation. Then the oil enters the auxiliary heat dissipation device, and excess heat is transferred to the cooling water in the heat exchange water tank 16, and returns to the gear oil tank 1 through the oil outlet of the heat exchange water tank 16 and the oil return shut-off valve 10 of the cooling oil pipe. The cooling water in the auxiliary cooling device passes through the second temperature sensor 17 and the second flow sensor 18 to collect the cooling water temperature and flow rate, and the data is transmitted to the control unit 22, and the control unit controls the electric water pump 19 and the second electric cooling fan 21. The cooling water is forced to dissipate heat in the second radiator 20 to finally achieve the purpose of cooling the oil.

The series of detailed descriptions listed above are only specific descriptions for feasible implementations of the present invention, and they are not intended to limit the protection scope of the present invention. Any equivalent implementation or implementation that does not depart from the technical spirit of the present invention All changes should be included within the protection scope of the present invention.

Claims (2)

1. a kind of heat dissipating method of combined radiating device for wind-power electricity generation reduction gear box, the combined radiating device include Gear tank (1) goes out oil cut-off valve (2), electric hydraulic oil pump (3), high-pressure safety valve (4), fine cleaner (5), middle pressure safety valve (6), coarse filter (7), the first radiator (14), oil return shut-off valve (10), heat exchange water tank (16), electric water pump (19), second Radiator (20), control unit (22)；

It is described go out oil cut-off valve (2) oil inlet connected with the gear tank (1) oil outlet, it is described go out oil cut-off valve (2) it is fuel-displaced Mouth is connected with the electric hydraulic oil pump (3) oil inlet, and the high-pressure safety valve (4) is connected to the electric hydraulic oil pump (3) Both ends, electric hydraulic oil pump (3) oil outlet are connected with the fine cleaner (5) oil inlet, medium pressure safety valve (6) connection At the fine cleaner (5) both ends, fine cleaner (5) oil outlet is connected with the coarse filter (7) oil inlet, the coarse filter (7) oil outlet connects the oil inlet of first radiator (14), and the oil outlet of first radiator (14) connects the heat Water tank (16) oil inlet is exchanged, heat exchange water tank (16) oil outlet connects oil return shut-off valve (10) oil inlet, described Oil return shut-off valve (10) oil outlet connects gear tank (1) oil inlet, forms fluid circuit；The heat exchange water tank (16) Inside passes through piping connection oil inlet and oil outlet；Inlet and outlet are additionally provided on the babinet of heat exchange water tank (16), institute It states and is full of cooling water inside heat exchange water tank (16)；The water outlet is electronic by piping connection electric water pump (19) water inlet Water pump (19) water outlet connects heat exchange by the second radiator of piping connection (20) water inlet, the second radiator (20) water outlet Water tank (16) water inlet forms chilled(cooling) water return (CWR)；

The electric hydraulic oil pump (3), the electric water pump (19) carry out data company by signal wire and control unit (22) It connects；Control unit (22) is used to control the rotating speed of the rotating speed of electric hydraulic pump (3), the electric water pump (19)；It is characterized in that,

The radiator is divided into 4 kinds of operating modes according to the difference that cooling and lubricating fluid indexes：Low-temperature cool starting state, high pressure State, medium/low pressure condition, the condition of high temperature；Specifically：

(a) first start the lubrication and cooling device of electricity generation system, after each oil site fully obtains lubrication before booting work every time Restart gear-box work；Etc. systems be in low-temperature cool starting state, first pass through electric hydraulic oil pump and high-pressure safety valve and carry out Heating, Restarter after gear oil is heated；

(b) gear oil temperature is relatively low when just booting, and the viscosity of gear oil is big, and system pressure is caused to increase, and device is in high pressure shape State, under this state gear oil circuit is directly constituted with electric hydraulic oil pump by high-pressure safety valve, the cycle of accelerating gear oil makes Oil temperature increases rapidly, reduces the pressure in device；

(c) as the cycle of gear oil, gear oil temperature constantly increase, the pressure in pipeline continuously decreases, device be operated in/ Low-pressure state, under this state high-pressure safety valve be automatically closed, middle pressure safety valve automatically opens, a gear oil part successively through going out Oil cut-off valve, electric hydraulic oil pump, fine cleaner, coarse filter, thermostat valve, oil return shut-off valve flow back to gear tank, and another part is also By flowing back to gear tank after the first radiator, heat exchange water tank；

(d) after gear oil temperature further increases, device is operated in medium/low pressure condition, and middle pressure safety valve is automatic under this state It closes, gear oil flows back to gear tank after two-stage filter and constitutes circuit；Under this state if oil temperature increases, electronic liquid The flow of pressure oil pump increases；

(e) after system long-play, gear oil oil temperature is caused to be in the condition of high temperature, under this state, thermostat valve is closed, gear oil Enter heat exchange water tank after first passing through two-stage filter filtering, the first radiator heat-dissipation, by extra heat in heat exchange water tank Amount passes to cooling water, and fluid after cooling returns to gear tank through oil outlet, oil return shut-off valve, realizes fluid cooling.

2. heat dissipating method according to claim 1, which is characterized in that (e) further includes：

Pipeline oil temperature and flow are acquired, and passes data to control by the first temperature sensor, first flow sensor Unit processed is adjusted the working condition of the first electronic cooling fan by control unit and is dissipated with the first radiator of acceleration or deceleration in real time Heat；

Cooling water temperature, flow are acquired by second temperature sensor, second flow sensor, and it is single to pass data to control Member is adjusted electric water pump by control unit in real time, the working condition of the second electronic cooling fan is radiated with acceleration or deceleration second Device radiates.