Cooling system of boiler frequency conversion cabinet

Abstract

The utility model relates to a cooling system of a boiler frequency conversion cabinet, which comprises a frequency conversion cabinet, an air preheater, a boiler fan and a boiler, a heat exchanger and an in-cabinet temperature sensor are arranged in the frequency conversion cabinet, and a liquid inlet of the heat exchanger is connected with a liquid outlet of the air preheater through a first connecting pipeline. A liquid outlet of the heat exchanger is connected with a liquid inlet of the air preheater through a second connecting pipeline, a cooling liquid circulating pump is arranged on the first connecting pipeline, outdoor air enters the air inlet side of the air preheater, the air outlet side of the air preheater is connected with a boiler fan, and the boiler fan is connected with a boiler. On the premise that the heat radiation requirement of the frequency conversion cabinet is met, heat radiated by the frequency conversion cabinet is reasonably utilized, and faults of electrical elements in the frequency conversion cabinet caused by invasion of external dust are reduced. The larger the temperature difference between the air temperature of the air inlet of the boiler fan and the temperature in the frequency conversion cabinet is, the better the heat exchange effect is, and the more obvious the cooling and energy-saving effects in the cabinet are.

Description

TECHNICAL FIELD

[0001] The utility model relates to the cooling technical field of frequency conversion cabinet for industrial boiler, specifically relates to a cooling system of boiler frequency conversion cabinet. BACKGROUND

[0002] With the progress of science and technology, the load control precision requirement of boiler equipment is higher and higher, and the energy consumption requirement of boiler equipment of boiler using unit is also higher and higher. At present, frequency conversion control mode is gradually adopted for boiler fan and water pump to improve the precision of boiler load regulation, and greatly reduce the power consumption of boiler fan and water pump at low load.

[0003] With the increase of rated evaporation capacity of boiler equipment, the power of the fan and water pump used in conjunction also increases accordingly, and the frequency conversion cabinet matched with the fan and water pump also increases. At present, the heat dissipation mode of low-voltage frequency conversion cabinet and high-voltage frequency conversion cabinet is mainly air cooling, and the cooling fan of the cabinet is used to draw air outside the cabinet into the cabinet, and then the air is discharged outside the cabinet after heat exchange with the frequency converter and other heat dissipation elements. The heat dissipation of the frequency conversion cabinet is dissipated in the air, which cannot be effectively utilized. If the dust in the place where the frequency conversion cabinet is arranged is more, the air filter at the air inlet is easily blocked, which reduces the amount of cooling air, increases the temperature in the cabinet, causes the temperature of the frequency converter to be too high, and further causes the interlocked protection of the boiler equipment to be stopped. At the same time, dust will enter the cabinet with the air, and with the accumulation of time, the dust will adhere to the circuit board of the frequency converter, causing the frequency converter to malfunction, which has certain safety hidden danger. CONTENT OF THE UTILITY MODEL

[0004] The utility model aims at overcoming the above-mentioned defects, and provides a cooling system of boiler frequency conversion cabinet, which can reasonably utilize the heat dissipated by the frequency conversion cabinet under the premise of meeting the heat dissipation requirement of the frequency conversion cabinet, and reduce the failure of electrical elements in the frequency conversion cabinet caused by the invasion of external dust. It is especially suitable for northern heating boiler equipment, and the larger the temperature difference between the air temperature at the air inlet of the boiler fan and the temperature in the frequency conversion cabinet, the better the heat exchange effect, and the more obvious the cooling and energy saving effect in the cabinet.

[0005] The utility model aims at overcoming the above-mentioned defects, and provides a cooling system of boiler frequency conversion cabinet, which can reasonably utilize the heat dissipated by the frequency conversion cabinet under the premise of meeting the heat dissipation requirement of the frequency conversion cabinet, and reduce the failure of electrical elements in the frequency conversion cabinet caused by the invasion of external dust. It is especially suitable for northern heating boiler equipment, and the larger the temperature difference between the air temperature at the air inlet of the boiler fan and the temperature in the frequency conversion cabinet, the better the heat exchange effect, and the more obvious the cooling and energy saving effect in the cabinet.

[0006] The utility model relates to a cooling system of boiler frequency conversion cabinet, including frequency conversion cabinet, air preheater, boiler fan and boiler, be equipped with heat exchanger and cabinet temperature sensor in the frequency conversion cabinet, the inlet of heat exchanger passes through first connecting pipe line and connects the outlet of air preheater, the outlet of heat exchanger passes through second connecting pipe line and connects the inlet of air preheater, be equipped with cooling liquid circulating pump on the first connecting pipe line, outdoor air enters the air preheater and is connected boiler fan in the air preheater of air preheater air preheater of wind side, boiler fan is connected boiler.

[0007] Preferably, the frequency conversion cabinet is provided with a humidity sensor and a dehumidifier, and the humidity sensor and the dehumidifier are electrically connected.

[0008] Preferably, the frequency conversion cabinet is further provided with an air circulation fan for air circulation in the cabinet.

[0009] Preferably, the air preheater is provided with an air inlet temperature sensor and an air outlet temperature sensor respectively at an air inlet and an air outlet, and the air inlet temperature sensor and the air outlet temperature sensor are connected to a PLC of the boiler.

[0010] Preferably, the heat exchanger is provided with two interfaces of an inlet and an outlet respectively extending out of the cabinet, and the interfaces are sealed with the cabinet body.

[0011] Preferably, the cooling medium forms a cooling liquid circulation loop between the air preheater and the heat exchanger through a cooling liquid circulation pump, and the cooling medium in the cooling liquid circulation loop is antifreeze or glycol solution.

[0012] The utility model discloses the beneficial effects are:

[0013] (1) greatly reduce the temperature in the frequency conversion cabinet, improve the use efficiency of frequency converter, improve the service life of electrical components.

[0014] (2) compared with the traditional frequency conversion cabinet cooling fan, not only recycles the heat in the frequency conversion cabinet, supplies the boiler air inlet heating, has the effect of energy saving and emission reduction, and does not need the cooling fan circulating with the outside, improves the protection level of the cabinet body, avoids the dust from entering from the cooling fan filter, improves the service life of electrical components.

[0015] (3) the utility model can be used in frequency conversion cabinet, also can be used in the high -power transformer cabinet in the boiler room and the data server cooling of the boiler control center. DRAWINGS

[0016] Figure 1 It is the structure diagram of the cooling system of the utility model one kind of boiler frequency conversion cabinet.

[0017] Among them: frequency conversion cabinet 1;Air preheater 2;Boiler fan 3;Boiler 4;Heat exchanger 5;Cabinet temperature sensor 6;Humidity sensor 7;Dehumidifier 8;Air circulation fan 9;First connecting pipeline 10;Second connecting pipeline 11;Cooling liquid circulation pump 12. CONCRETE IMPLEMENTATION

[0018] See Figure 1The utility model relates to a kind of cooling system of boiler frequency conversion cabinet, including frequency conversion cabinet 1, air preheater 2, boiler fan 3 and boiler 4, the heat exchanger 5, cabinet temperature sensor 6, humidity sensor 7, dehumidifier 8, air circulation fan 9 and frequency converter are equipped in the frequency conversion cabinet 1, the liquid inlet of the heat exchanger 5 is connected the liquid outlet of air preheater 2 by first connecting pipeline 10, the liquid outlet of the heat exchanger 5 is connected the liquid inlet of air preheater 2 by second connecting pipeline 11, cooling liquid circulating pump 12 is equipped on the first connecting pipeline 10, the air preheater 2 is connected outdoor by air duct connection side of inlet air, with outside air communication, air outlet side is connected boiler fan 3 by air duct, the boiler fan 3 is connected boiler 4, and outside cold air is drawn into air preheater 2 by the suction of boiler fan 3, and is exchanged with cooling liquid, and hot air after heat exchange enters boiler 4, and is heated for boiler inlet air.

[0019] The cabinet temperature sensor 6 is used for detecting the temperature in the frequency conversion cabinet, and the cabinet temperature sensor 6 is linked with the cooling liquid circulating pump 12, when the temperature in the cabinet is higher than the set temperature standard value, the cooling liquid circulating pump 12 is started, and the frequency conversion cabinet is cooled by liquid, and when the temperature in the cabinet is lower than the temperature standard value, the cooling liquid circulating pump 12 does not act.

[0020] The humidity sensor 7 is used for detecting the humidity in the frequency conversion cabinet, and the dehumidifier 8 is used for controlling the humidity in the frequency conversion cabinet, and the humidity sensor 7 is linked with the dehumidifier 8, when the humidity in the cabinet is higher than the humidity standard value, the dehumidifier 8 is started, and when the humidity in the cabinet is lower than the humidity standard value, the dehumidifier 8 does not act.

[0021] The air circulation fan 9 is used for circulating the air in the frequency conversion cabinet, and the air circulation fan 9 is linked with the frequency converter operation signal; the frequency converter operates, and the air circulation fan 9 is started, so that the air in the cabinet flows, and the temperature and humidity in the cabinet are evenly dispersed.

[0022] The air inlet and air outlet of the air preheater 2 are respectively provided with an air inlet temperature sensor and an air outlet temperature sensor, and the air inlet temperature sensor and the air outlet temperature sensor are connected to the PLC of the boiler.

[0023] The cabinet temperature sensor 6, the air inlet temperature sensor and the air outlet temperature sensor can be temperature measuring elements such as thermal resistance and thermocouple, or other forms of temperature measuring elements.

[0024] The heat exchanger 5 is provided with two interfaces of inlet and outlet respectively extending out of the cabinet, and the interfaces are sealed between the cabinet body.

[0025] The cooling medium forms a cooling liquid circulation loop between the air preheater 2 and the heat exchanger 5 through the cooling liquid circulating pump 12, and the cooling medium in the cooling liquid circulation loop is antifreeze or glycol solution.

[0026] There are two operation modes for the cooling system of the boiler frequency conversion cabinet, which are as follows:

[0027] Mode 1: The cooling liquid circulating pump is controlled according to the temperature in the cabinet. When the temperature in the cabinet is higher than the set temperature, the circulating pump is started; and when the temperature in the cabinet is lower than the set temperature, the circulating pump is stopped.

[0028] Specifically, when the boiler equipment is running, the boiler fan 3 is started, and the air circulating fan 9 starts to run, so that the temperature in the cabinet is uniformly distributed. The temperature in the cabinet is continuously detected by the cabinet temperature sensor 6. A temperature switch is arranged in the cabinet, and the cabinet temperature sensor 6 is connected to the temperature switch. The set value of the temperature switch is 40℃ (adjustable), and the hysteresis is 20℃ (adjustable). When the cabinet temperature sensor 6 detects that the air temperature in the cabinet is greater than or equal to 40℃, a signal for starting the cooling liquid circulating pump is output. At this time, the cooling medium circulates between the air preheater 2 and the heat exchanger 5. The cooling medium enters and exits the heat exchanger 5, and takes away the heat in the cabinet. The outdoor cold air (the average outdoor cold air of the northern heating boiler is about -10℃, slightly higher during the day and slightly lower at night) extracted by the boiler fan 3 exchanges heat with the cooling medium out of the heat exchanger. The cooled cooling medium returns to the frequency conversion cabinet to cool the air in the cabinet. The air that is heated by the heat exchange enters the boiler. When the cabinet temperature sensor detects that the air temperature in the cabinet is less than or equal to 20℃ (adjustable), a signal for stopping the cooling liquid circulating pump 12 is output, and the cooling liquid circulating pump 12 is stopped. In this way, the temperature in the frequency conversion cabinet is maintained between 20-40℃ (adjustable according to the set value).

[0029] Mode 2: The cooling liquid circulating pump is controlled according to the operation signal of the boiler fan. When the boiler fan starts to run, the circulating pump is automatically started; and when the boiler fan stops, the circulating pump is automatically stopped.

[0030] Specifically, when the boiler equipment is running, the boiler fan 3 is started, and the air circulating fan 9 starts to run, so that the temperature in the cabinet is uniformly distributed. The operation signal of the boiler fan 3 is associated with the signal for starting the cooling liquid circulating pump. The cooling liquid circulating pump is started along with the starting of the boiler fan, and the cooling liquid circulating pump 12 is stopped along with the stopping of the boiler fan. The cooling medium circulates between the air preheater 2 and the heat exchanger 5. The cooling medium enters and exits the heat exchanger 5, and takes away the heat in the cabinet. The outdoor cold air (the average outdoor cold air of the northern heating boiler is about -10℃, slightly higher during the day and slightly lower at night) extracted by the boiler fan 3 exchanges heat with the cooling medium out of the heat exchanger. The cooled cooling medium returns to the frequency conversion cabinet to cool the air in the cabinet. The air that is heated by the heat exchange enters the boiler. In this way, the temperature in the frequency conversion cabinet is always maintained at the lowest temperature.

[0031] In addition to the above embodiments, the utility model also includes other implementation manners. Any technical solution formed by equivalent transformation or equivalent replacement shall fall within the protection scope of the utility model claim.

Claims

1. A cooling system of a boiler frequency conversion cabinet, characterized in that: The frequency conversion cabinet is internally provided with a heat exchanger and a cabinet temperature sensor, a liquid inlet of the heat exchanger is connected with a liquid outlet of the air preheater through a first connecting pipeline, a liquid outlet of the heat exchanger is connected with a liquid inlet of the air preheater through a second connecting pipeline, a cooling liquid circulating pump is arranged on the first connecting pipeline, outdoor air enters an air preheater from an air inlet side of the air preheater, an air outlet side of the air preheater is connected with the boiler fan, and the boiler fan is connected with the boiler.

2. The cooling system of a boiler frequency conversion cabinet according to claim 1, characterized in that: The frequency conversion cabinet is internally provided with a humidity sensor and a dehumidifier, and the humidity sensor and the dehumidifier are electrically connected.

3. The cooling system of a boiler frequency conversion cabinet according to claim 1 or 2, characterized in that: The frequency conversion cabinet is further internally provided with an air circulation fan for air circulation in the cabinet.

4. The cooling system of a boiler frequency conversion cabinet according to claim 1, characterized in that: The air preheater is provided with an air inlet temperature sensor and an air outlet temperature sensor, and the air inlet temperature sensor and the air outlet temperature sensor are connected with a PLC of the boiler.

5. The cooling system of a boiler frequency conversion cabinet according to claim 1, characterized in that: The heat exchanger is provided with two interfaces of an inlet and an outlet respectively extending out of the cabinet, and the interfaces are sealed with the cabinet body.

6. The cooling system of a boiler frequency conversion cabinet according to claim 1, characterized in that: The cooling medium forms a cooling liquid circulating loop between the air preheater and the heat exchanger through the cooling liquid circulating pump, and the cooling medium in the cooling liquid circulating loop is antifreeze or glycol solution.

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