CN111757655A - A water-proof, dust-proof, air-water-cooled cooling system and method for a fan frequency converter in a mining area power plant - Google Patents

Abstract

A mining area power plant fan frequency converter waterproof dustproof air-water cooling system and a method belong to the technical field of mining area power plant energy conservation, and solve the problem of how to carry out dustproof and waterproof heat dissipation on a mining area power plant fan frequency converter; the inside pressure-fired state that is in always of converter room, clean air cyclic utilization has avoided a large amount of dusts in mining area to get into the converter room inside, reduces the inside plate fault rate of converter, has improved equipment reliability.

Description

A water-proof, dust-proof, air-water-cooled cooling system and method for a fan frequency converter in a mining area power plant

technical field

The invention belongs to the technical field of energy saving of power plants in mining areas, and in particular relates to a water-proof, dust-proof, air-water-cooled cooling system and method for frequency converters of fans in power plants in mining areas.

Background technique

A frequency converter is a power control device that converts a power frequency power supply into another frequency by using the on-off function of a power semiconductor device. In the overall fan equipment, the frequency converter is mainly used to change the motor speed, adjust the motor speed in real time according to the needs of different working conditions, and play a role in energy saving and consumption reduction when meeting the needs of the working conditions.

There will be a large amount of high-temperature gas (about 50 ℃) at the outlet of the cooling fan of the inverter. These high-temperature gases will increase the temperature in the high-voltage inverter room, and the high temperature of the inverter will not only affect the service life of the inverter, but also cause When the inverter fails to stop, it seriously threatens the operation safety of the unit. Therefore, the timely cooling of the inverter in the working state is of great significance to the reliability of the blower. And because there is a lot of dust in various production links near the mining area, the dust will have a very serious impact on the inverter, resulting in a decrease in heat dissipation efficiency, and even overheating of the fryer. If there is conductive dust, it is even more dangerous.

In the prior art, the main way to reduce the room temperature of the high-voltage frequency converter is to adopt the method of indoor air conditioning. Although this method can play a good cooling effect, this method has the following disadvantages:

(1) The installation and operation and maintenance costs of air conditioners are very high, and their energy consumption is huge;

(2) Dust will enter the inverter from the gap around the filter surface of the inverter and the gap between the front and rear covers, so it is not dust-proof.

The Chinese utility model patent "A Cooling System for a High-Power AC Inverter for Mining" with the authorization announcement number of CN209768085U and the authorization announcement date of December 10, 2019 discloses a cooling system for a high-power AC inverter for mining, including heat dissipation A water tank, a left circulation heat dissipation system and a right circulation heat dissipation system. The heat dissipation water tank is provided with a first water outlet, a first water inlet, a second water outlet and a second water inlet. A water outlet, a left water pump, a left radiator, a left condenser and a first water inlet, and the right circulating cooling system includes a second water outlet, a right water pump, a right radiator, a right condenser and a second water inlet which are connected in sequence through pipes ; A first valve is arranged on the pipeline between the first water outlet and the water inlet of the left radiator, a second valve is arranged on the pipeline between the second water outlet and the water inlet of the right radiator, and the water outlet of the right radiator is connected to the second valve. A third valve is arranged on the pipeline between the two water inlets, the water inlet of the left radiator and the water inlet of the right radiator are communicated through a spare pipe, and a fourth valve is arranged on the spare pipe.

The above patent uses the circulating water provided by the cooling water tank to water-cool the frequency converter, which improves the heat dissipation efficiency and capability. However, the above-mentioned patent still does not solve the problem that the frequency converter is not dust-proof, and because the frequency converter is water-cooled, there is a phenomenon of water leakage in the pipeline. Accidents that cause a short circuit of the inverter.

Therefore, how to realize effective dustproof, waterproof and heat dissipation for the fan inverter in operation is a technical problem that needs to be solved urgently at present.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is how to realize dustproof, waterproof and heat dissipation for the fan frequency converter of the power plant in the mining area.

The present invention solves the above technical problems through the following technical solutions.

A water-proof, dust-proof, air-water-cooled cooling system for a frequency converter of a fan in a power plant in a mining area, comprising a frequency converter room (1), a frequency converter (2), a frequency converter fan (3), a hot air duct (5), a wind collecting box (6), an air Water cooling equipment (7), cold air duct (8), the frequency converter room (1) is a closed building, the frequency converter (2) is installed on the basis of the inside of the frequency converter room (1), and the frequency converter ( 2) A frequency converter fan (3) is installed on the top, and the frequency converter fan (3) is connected to a wind collecting box (6) installed on the outdoor top of the frequency converter room (1) through a hot air pipe (5). (6) Connect to the input end of the air-water cooling device (7) installed on the outdoor top of the inverter room (1). One end of the cold air pipe (8) is connected to the output end of the air-water cooling device (7), and the other end is connected to the output end of the air-water cooling device (7). Extend into the air inlet side of the inverter (2) in the inverter room (1).

Discharge the hot air in the inverter room (1) to the air collecting box (6) through the hot air duct (5) by the inverter fan (3); pump the hot air inside the air collecting box (6) to the air-water cooling device (7) After cooling, the hot air is discharged to the inner side of the inverter room (1) through the cold air duct (8), and the inverter fan (3) draws the cold air into the inverter (2) to cool the components. The hot air is discharged to the hot air duct (5), and the cycle reciprocates; due to the action of the inverter fan (3) and the air collecting box (6), the interior of the inverter room (1) is always in a slightly positive pressure state, and the clean air is recycled. A large amount of dust in the mining area is prevented from entering the interior of the frequency converter room (1), the failure rate of the internal boards of the frequency converter is reduced, and the reliability of the equipment is improved.

As a further improvement of the technical solution of the present invention, the system further includes a water pump (10), a plurality of air collecting box fans and a power supply circuit for the water pump fan, and the water pump fan power supply circuit supplies power to the water pump (10) and the plurality of air collecting box fans , the water pump (10) is connected to the air-water cooling device (7) for supplying refrigerant to the air-water cooling device (7), and the plurality of air collecting box fans are connected to the air collecting box (6) for connecting the air collecting box (6) The hot air inside is pumped into the air-water cooling equipment (7).

As a further improvement of the technical solution of the present invention, the air-water cooling device (7) includes an air cooling box (71) and a cooler (72), and the plurality of air collecting box fans draws the hot air inside the air collecting box (6). into the air cooling box (71), the water pump (10) is connected to the cooler (72), the water pump (10) extracts the refrigerant and sends it into the cooler (72), and the cooler (72) cools the air The hot air in the box (71) is cooled and then discharged into the cold air duct (8).

As a further improvement of the technical solution of the present invention, the system further includes a frequency converter filter screen (4), and the frequency converter filter screen (4) is installed at the air inlet of the frequency converter (2).

As a further improvement of the technical solution of the present invention, the refrigerant is the circulating cooling water from the power plant.

As a further improvement of the technical solution of the present invention, the water pump fan power supply circuit includes a third air switch (19), and the third air switch (19), the water pump frequency converter (20), and the water pump (10) are connected in series in sequence. Connect to the three-phase power bus.

As a further improvement of the technical solution of the present invention, the plurality of air collecting box fans include a first fan (31) and a second fan (32), and the water pump fan power supply circuit further includes a first thermal relay (12), a second fan (32) Two thermal relays (13), a first contactor normally open contact (14), a second contactor normally open contact (15), a first air switch (17), a second air switch (18), the described The first air switch (17), the first contactor normally open contact (14), the first thermal relay (12), and the first fan (31) are connected in series to the three-phase power busbar in sequence; the second air The switch (18), the normally open contact (15) of the second contactor, the second thermal relay (13), and the second fan (32) are connected in series in sequence and then connected to the three-phase power bus.

As a further improvement of the technical solution of the present invention, the water pump fan power supply circuit further comprises a water pump radiator (11), a third contactor normally open contact (16), and the third contactor normally open contact (16) ) is connected in series with the common point of the third air switch (19) and the water pump inverter (20), and the other end is connected in series with the water pump radiator (11).

As a further improvement of the technical solution of the present invention, the model of the water pump inverter (20) is ACS510.

A method for the waterproof, dust-proof, air-water-cooled cooling system of the fan frequency converter of a power plant in a mining area, characterized in that it comprises the following steps:

Step 1: The frequency converter fan (3) discharges the hot air in the frequency converter room (1) to the air collecting box (6) through the hot air duct (5);

Step 2: pumping the hot air inside the air collecting box (6) to the air-water cooling equipment (7) for cooling;

Step 3: The cooled hot air is discharged to the inner side of the inverter room (1) through the cold air duct (8).

Step 4: The inverter fan (3) draws the cold air into the inverter (2) to cool the components, and the cooled hot air is discharged to the hot air duct (5), and the cycle is repeated.

The advantages of the present invention are:

(1) Discharge the hot air in the inverter room (1) to the air collecting box (6) through the hot air duct (5) through the inverter fan (3); pump the hot air inside the air collecting box (6) to the air-water cooling equipment (7) for cooling; the cooled hot air is discharged to the inner side of the inverter room (1) through the cold air duct (8), and the inverter fan (3) draws the cold air into the inverter (2) to cool the components. , the cooled hot air is discharged to the hot air duct (5), and the cycle reciprocates; due to the action of the inverter fan (3) and the air collecting box (6), the interior of the inverter room (1) is always in a slightly positive pressure state, clean air Recycling prevents a large amount of dust in the mining area from entering the interior of the frequency converter room (1), reduces the failure rate of the internal boards of the frequency converter, and improves the reliability of the equipment.

(2) The air-water cooling device (7) is installed on the top of the inverter room (1), and the circulating cooling water is used as a refrigerant to cool the hot air flowing through the air-water cooling device (7), instead of directly cooling the inverter (2) with water. Carry out cooling to avoid the accident of short circuit of the inverter caused by water leakage in the pipeline.

(3) The circulating cooling water of the power plant in the mining area is used as the refrigerant, the frequency converter is used to control the output of the pump, the circulating cooling water of the power plant is extracted, and the frequency conversion command is adjusted at any time according to the specific room temperature, so as to ensure that the indoor temperature is within 33 ℃ for a long time; compared with Air-conditioning is used for cooling, and the air-conditioning current is about 130A. The current of all fans and booster pumps in the waterproof, dust-proof, air-water-cooled cooling system of the mining area power plant fan inverter of the present invention is 70A, which saves about 2,500 kWh of electricity per day and 900,000 kWh of electricity per year. The benefits are considerable.

(4) The model of the water pump inverter (20) is ACS510. The inverter of this model has compact structure, small installation space, low harmonics, small electromagnetic interference, stable performance and wide application range.

(5) A frequency converter filter screen (4) is arranged outside the frequency converter (2), which can filter the dust in the room and further improve the dustproof effect of the system.

Description of drawings

Fig. 1 is a structural diagram of a waterproof, dust-proof, air-water-cooled cooling system of a mine fan frequency converter according to an embodiment of the present invention.

2 is a circuit diagram of a fan and water pump of a waterproof, dust-proof, air-water-cooled cooling system for a mine fan frequency converter according to an embodiment of the present invention.

Detailed ways

In order to make the purposes, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are part of the present invention. examples, but not all examples. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

The technical solutions of the present invention are further described below in conjunction with the accompanying drawings and specific embodiments:

Example 1

As shown in Figure 1, a water-proof, dust-proof, air-water-cooled cooling system for a fan of a power plant in a mining area includes a frequency converter room 1, a frequency converter 2, a frequency converter fan 3, a frequency converter filter screen 4, a hot air duct 5, and a wind collection box 6 , Air-water cooling equipment 7, cold air duct 8.

The frequency converter room 1 is a closed building, the frequency converter 2 is installed on the basis of the inside of the frequency converter room 1, the frequency converter filter screen 4 is installed on one side of the frequency converter 2, and the frequency converter fan 3 is installed on the top. , the frequency converter fan 3 is connected with the air collecting box 6 installed on the outdoor top of the frequency converter room 1 through the hot air pipe 5, and the air collecting box 6 is connected with the input end of the air-water cooling equipment 7 installed on the outdoor top of the frequency converter room 1, One end of the cold air duct 8 is connected to the output end of the air-water cooling device 7 , and the other end extends into the inverter filter screen 4 side of the inverter room 1 .

As shown in FIG. 2, the main circuit diagram of the fan and water pump of this embodiment includes a water pump 10, a water pump radiator 11, a first thermal relay 12, a second thermal relay 13, a first contactor normally open contact 14, a second Contactor normally open contact 15 , third contactor normally open contact 16 , first air switch 17 , second air switch 18 , third air switch 19 , first fan 31 , second fan 32 .

The first air switch 17, the first contactor normally open contact 14, the first thermal relay 12, and the first fan 31 are connected in series to the three-phase power busbar in sequence; the second air switch 18, the second The normally open contact 15 of the contactor, the second thermal relay 13, and the second fan 32 are connected in series to the three-phase power bus bar in sequence; the third air switch 19, the water pump inverter 20, and the water pump 10 are connected in series to the three-phase power supply bus in sequence. The power bus is connected; one end of the normally open contact 16 of the third contactor is connected to the series common point of the third air switch 19 and the water pump inverter 20 , and the other end is connected to the water pump radiator 11 in series.

The model of the water pump inverter 20 is ACS510. The inverter of this model has a compact structure, small installation space, low harmonics, small electromagnetic interference, stable performance and wide application range.

The inverter fan 3 leads the hot air in the inverter room 1 to the air collecting box 6 through the hot air pipe 5. The air-water cooling equipment 7 includes a cooler, a water pump 10, a first fan 31 and a second fan 32. The water pump 10 It is used to supply circulating cooling water to the cooler. The first fan 31 and the second fan 32 are used to pump the hot air inside the air collecting box 6 to the cooler. To the side of the inverter filter 4 of the inverter 3 inside the inverter room 1, and then the inverter fan 3 is pumped into the inverter 2 to cool the components, and the cooled hot air is discharged to the hot air duct 5, and the cycle is repeated. Due to the power of the inverter fan 3 and the first fan 31 and the second fan 32, the inside of the inverter room 1 is always in a state of slight positive pressure, and the clean air is recycled to prevent a large amount of dust from the mining area from entering the inverter room 1. , reduce the failure rate of the internal boards of the inverter and improve the reliability of the equipment.

The air-water cooling device 7 is installed on the top of the inverter room 1, and the circulating cooling water is used as a refrigerant to cool the hot air flowing through the air-water cooling device 7, instead of directly cooling the inverter 2, so as to avoid the frequency conversion caused by the leakage of the pipeline. short circuit accident.

The circulating cooling water of the power plant in the mining area is used as the refrigerant, the frequency converter is used to control the output of the pump, the circulating cooling water of the power plant is extracted, and the frequency conversion command is adjusted at any time according to the specific room temperature, so as to ensure that the indoor temperature is within 33 °C for a long time; , the current of the air conditioner is about 130A, and the current of all fans and booster pumps in the waterproof, dustproof, air-water-cooled cooling system of the mine fan frequency converter of the present invention is 70A, which saves about 2,500 kWh of electricity every day and 900,000 kWh of electricity every year, and the economic benefits are very considerable.

The above embodiments are only used to illustrate the technical solutions of the present invention, but not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: The recorded technical solutions are modified, or some technical features thereof are equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (10)

1. The utility model provides a waterproof dustproof air-water cooling system of mining area power plant fan converter, its characterized in that includes converter room (1), converter (2), converter fan (3), hot-blast main (5), collection bellows (6), air-water cooling equipment (7), cold air duct (8), converter room (1) be confined building, converter (2) install on the inside basis of converter room (1), converter fan (3) is installed at the top of converter (2), converter fan (3) pass through hot-blast main (5) and be connected in the collection bellows (6) of the outdoor top of converter room (1), collection bellows (6) with install in the input of the air-water cooling equipment (7) of the outdoor top of converter room (1) and be connected, the one end of cold air duct (8) be connected with the output of air-water cooling equipment (7), the other end extends into the air inlet side of the frequency converter (2) in the frequency converter chamber (1).

2. The mining power plant fan frequency converter waterproof and dustproof air-water cooling system according to claim 1, characterized in that the system further comprises a water pump (10), a plurality of air collecting box fans and a water pump fan power supply circuit, the water pump fan power supply circuit supplies power to the water pump (10) and the plurality of air collecting box fans, the water pump (10) is connected with the air-water cooling equipment (7) and used for supplying refrigerants to the air-water cooling equipment (7), and the plurality of air collecting box fans are connected with the air collecting box (6) and used for pumping hot air inside the air collecting box (6) into the air-water cooling equipment (7).

3. The mining power plant fan frequency converter waterproof dustproof air-water cooling system according to claim 2, characterized in that the air-water cooling device (7) comprises an air cooling box (71) and a cooler (72), the plurality of air collecting box fans pump hot air inside the air collecting box (6) to the air cooling box (71), the water pump (10) is connected with the cooler (72), the water pump (10) pumps refrigerant to be sent to the cooler (72), and the cooler (72) cools the hot air of the air cooling box (71) and discharges the cooled air to the cold air pipe (8).

4. The mining area power plant fan frequency converter waterproof dustproof air-water cooling system according to claim 1, characterized in that the system further comprises a frequency converter filter screen (4), and the frequency converter filter screen (4) is installed at an air inlet of the frequency converter (2).

5. The mining area power plant fan frequency converter waterproof dustproof air-water cooling system as claimed in claim 2, wherein the coolant is circulating cooling water from a power plant.

6. The mining area power plant fan frequency converter waterproof dustproof air-water cooling system as claimed in claim 2, wherein the water pump fan power supply circuit comprises a third air switch (19), and the third air switch (19), the water pump frequency converter (20) and the water pump (10) are sequentially connected in series and then connected with a three-phase power supply bus.

7. The mining power plant fan frequency converter waterproof dustproof air-water cooling system according to claim 2, wherein the plurality of air collecting box fans comprise a first fan (31) and a second fan (32), the water pump fan power supply circuit further comprises a first thermal relay (12), a second thermal relay (13), a first contactor normally open contact (14), a second contactor normally open contact (15), a first air switch (17) and a second air switch (18), and the first air switch (17), the first contactor normally open contact (14), the first thermal relay (12) and the first fan (31) are sequentially connected in series and then are connected with a three-phase power supply bus; and the second air switch (18), the normally open contact (15) of the second contactor, the second thermal relay (13) and the second fan (32) are sequentially connected in series and then connected with a three-phase power supply bus.

8. The mining power plant fan frequency converter waterproof and dustproof air-water cooling system according to claim 1, wherein the water pump fan power supply circuit further comprises a water pump radiator (11) and a third contactor normally open contact (16), one end of the third contactor normally open contact (16) is connected with a common point of the third air switch (19) and the water pump frequency converter (20) in series, and the other end of the third contactor normally open contact is connected with the water pump radiator (11) in series.

9. The mining power plant fan frequency converter waterproof and dustproof air-water cooling system as claimed in claim 1, wherein the type of the water pump frequency converter (20) is ACS 510.

10. A method for the water-proof, dust-proof, air-water-cooled cooling system of the frequency converter of the blower of the mining power plant according to any one of claims 1 to 9, which is characterized by comprising the following steps:

the method comprises the following steps: the frequency converter fan (3) discharges hot air in the frequency converter chamber (1) into the air collecting box (6) through the hot air pipe (5);

step two: pumping hot air in the air collecting box (6) into an air-water cooling device (7) for cooling;

step three: the cooled hot air is discharged to one side inside the frequency converter chamber (1) through a cold air pipe (8);

step four: the frequency converter fan (3) pumps cold air into the frequency converter (2) to cool the components, and cooled hot air is discharged to the hot air pipe (5) to circulate.

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