CN217214166U - Air treatment unit and high-temperature reactor ventilation system - Google Patents

Abstract

The utility model provides an air treatment unit and high temperature heap ventilation system belongs to high temperature heap ventilation system technical field. The air processing unit comprises a box body, a refrigerating/heating coil and a heating unit; the box body is provided with a processing chamber, and an air inlet end and an air outlet end which are respectively communicated with the processing chamber; the refrigerating/heating coil is arranged in the processing chamber; the heating unit is arranged in the processing chamber and positioned on one side of the refrigerating/heating coil, and the heating unit can heat air when the air temperature at the refrigerating/heating coil is lower than a preset threshold value. The utility model discloses an add independent heating unit in refrigeration/heating coil one side for to refrigeration/heating coil department air heat when low temperature, prevent effectively that refrigeration/heating coil from being frozen out, guarantee air handling unit normal operating under low temperature environment, improve air handling unit operational reliability, extension air handling unit life.

Description

Air treatment unit and high-temperature reactor ventilation system

Technical Field

The utility model belongs to the technical field of the ventilation system of high temperature heap, concretely relates to ventilation system air treatment unit suitable for high temperature heap.

Background

In an air handling unit of a nuclear island ventilation system of a high-temperature reactor nuclear power plant, a refrigeration coil taking cold water as a medium and a heating coil taking steam as a medium are arranged, and the air temperature is adjusted.

The prior art has at least the following problems:

in winter, the heating steam fails to work and other accidents can lead the cooling water coil and the steam coil to lose heating, and the cooling water coil and the steam coil are frozen and cracked to be damaged under the quick cooling of low-temperature fresh air, so that anti-freezing measures are needed to be arranged to protect the cooling water coil and the steam coil.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving one of the technical problem that exists among the prior art at least, provide an air treatment unit and high temperature heap ventilation system.

One aspect of the present invention provides an air handling unit for a high temperature stack ventilation system, the air handling unit comprising a box, a cooling/heating coil, a fan, and a heating unit;

the box body is provided with a processing chamber, and an air inlet end and an air outlet end which are respectively communicated with the processing chamber;

the refrigerating/heating coil and the fan are both arranged in the processing chamber;

the heating unit sets up in the treatment chamber, and be located refrigeration/heating coil one side, the heating unit can be in air heating when the air temperature of refrigeration/heating coil department is less than preset threshold value.

Optionally, the air handling unit further comprises a temperature sensor and a control unit;

the temperature sensor is arranged at the refrigerating/heating coil, and the control unit is electrically connected with the temperature sensor and the heating unit respectively;

and the control unit is used for controlling the starting and stopping of the heating unit according to the temperature signal acquired by the temperature sensor.

Optionally, the preset threshold includes a lower threshold and an upper threshold;

and when the fan operates and the temperature value corresponding to the temperature signal is not greater than the lower threshold, the control unit starts the heating unit.

Optionally, when the fan stops operating or the temperature value corresponding to the temperature signal is not less than the upper threshold, the control unit turns off the heating unit.

Optionally, the preset threshold is 5-10 ℃.

Optionally, the air handling unit further includes a temperature transmitter, and the temperature transmitter is electrically connected to the temperature sensor and the control unit respectively.

Optionally, the heating unit is an electric heater, and the electric heater is a fixed-power electric heater or an adjustable-power electric heater.

Optionally, the electric heaterWhen the power of the electric heater is adjustable, the power of the electric heater is selected to be P ═ C_P *Q*(T₁ -T₀ )；

Wherein P is the electric heater power, C_P Is the specific heat capacity of air at constant pressure, Q is the air mass flow of the air handling unit, T₁ Selecting the temperature of 5-10 ℃ and T₀ Selecting the lowest average temperature in winter.

Optionally, the heating unit, the refrigeration/heating coil and the fan are sequentially arranged in the processing chamber along the airflow direction.

Another aspect of the present invention provides a high temperature stack ventilation system, including an air handling unit as described above.

In the air handling unit provided by the embodiment of the utility model, the independent heating unit is additionally arranged on one side of the refrigerating/heating coil, so that the refrigerating/heating coil can be effectively prevented from being frozen under the low-temperature working condition to influence the operation of the air handling unit; the utility model discloses the heating unit who adds plays the effect of protection refrigeration/heating coil pipe, reduces the maintenance work that low temperature freezes refrigeration/heating coil pipe, makes air treatment unit operational reliability greatly increased, improves high temperature and piles ventilation system work efficiency.

Drawings

Fig. 1 is a schematic structural diagram of an air handling unit according to the present invention.

In the figure, the position of the upper end of the main shaft,

1. an air outlet end; 2. a fan; 3. refrigeration/heating coils; 4. a temperature sensor;

5. a temperature transmitter; 6. a control unit; 7. a heating unit; 8. an air inlet end; 9. a box body; 10. a processing chamber.

Detailed Description

In order to make the technical solution of the present invention better understood by those skilled in the art, the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

As shown in fig. 1, an air handling unit for a high temperature stack ventilation system includes a cabinet 9, a cooling/heating coil 3, afan 2, and aheating unit 7. The box body 9 is provided with aprocessing chamber 10, and anair inlet end 8 and anair outlet end 1 which are respectively communicated with theprocessing chamber 10. The refrigerating/heating coil 3 and thefan 2 are both arranged in theprocessing chamber 10; theheating unit 7 is disposed in theprocessing chamber 10 and located at one side of the cooling/heating coil 3, and theheating unit 7 can heat air when the temperature of the air at the cooling/heating coil 3 is lower than a preset threshold value.

Specifically, as shown in fig. 1, the air handling unit carries out temperature regulation to high temperature stack ventilation system, and during winter, external environment temperature is lower, if the heating coil trouble, low to a certain extent when external temperature, in addition the rapid cooling of low temperature new trend is very easily frozen out cooling/heating coil 3 influences air handling unit normal operating, at this moment, can be right through theindependent heating unit 7 that adds the air of 3 departments of cooling/heating coil is heated, avoids cooling/heating coil 3 is frozen out, guarantees air handling unit's normal operating. In order to better protect the cooling/heating coil 3 in this embodiment, theheating unit 7 heats the air when the air temperature at the cooling/heating coil 3 is lower than a preset threshold. The heating unit is arranged on one side of the refrigerating/heating coil and is close to the refrigerating/heating coil, so that the heating is facilitated for heating air around the refrigerating/heating coil, the refrigerating/heating coil is prevented from being frozen due to low temperature, and the refrigerating/heating coil of the air handling unit is effectively protected.

Illustratively, as shown in fig. 1, the air handling unit further includes atemperature sensor 4 and acontrol unit 6. Thetemperature sensor 4 is arranged at the refrigerating/heating coil 3, and thecontrol unit 6 is electrically connected with thetemperature sensor 4 and theheating unit 7 respectively; and thecontrol unit 6 is used for controlling the start and stop of theheating unit 7 according to the temperature signal acquired by thetemperature sensor 4.

Specifically, thetemperature sensor 4 transmits the collected temperature signal of the refrigeration/heating coil 3 to thecontrol unit 6, thecontrol unit 6 compares the temperature value corresponding to the received temperature signal with a preset threshold value, and the start and stop of theheating unit 7 are controlled according to the comparison result. In the embodiment, the air at the refrigerating/heating coil 3 is automatically heated through thetemperature sensor 4 and thecontrol unit 6, and the heating is accurate and quick.

Illustratively, as shown in fig. 1, the preset threshold includes a lower threshold and an upper threshold; when thefan 2 operates and the temperature value corresponding to the temperature signal is not greater than the lower threshold, thecontrol unit 6 starts theheating unit 7. And when thefan 2 stops running or the temperature value corresponding to the temperature signal is not less than the upper threshold, thecontrol unit 6 closes theheating unit 7.

That is to say, when thefan 2 is running, it is necessary to determine whether the air temperature value at the cooling/heating coil 3 is lower than a lower threshold, and if the air temperature value at the cooling/heating coil 3 is not greater than the lower threshold, theheating unit 7 needs to be started to heat the air at the cooling/heating coil 3, so as to prevent the cooling/heating coil 3 from being frozen due to low temperature. If the air temperature value at the cooling/heating coil 3 is greater than a lower threshold value, then theheating unit 7 need not be activated. When thefan 2 stops operating, the air handling unit does not ventilate, outside cold air cannot enter or the air handling unit is in other working conditions, and theheating unit 7 is not started or theheating unit 7 stops operating at the moment. Similarly, when the temperature value corresponding to the temperature signal is not less than the upper threshold, the cooling/heating coil 3 is not activated, or it can be understood that theheating unit 7 heats the air temperature value at the cooling/heating coil 3 from the lower threshold to the upper threshold, and at this time, theheating unit 7 is turned off, and the heating of the air at the cooling/heating coil 3 is stopped.

The preset lower threshold and the preset upper threshold are set to 5 ℃ and 10 ℃ respectively in this embodiment. The threshold range can effectively protect the refrigerating/heating coil pipe and avoid the refrigerating/heating coil pipe from being frozen by low temperature; under the normal condition, when the fresh air temperature is lower than 0 ℃, the refrigerating/heating coil is easy to frost, and when the fresh air temperature is lower than 2 ℃ or 1 ℃, the refrigerating/heating coil is frosted, so that the refrigerating/heating coil can be better protected by selecting the preset threshold value between 5 ℃ and 10 ℃.

The control unit in this embodiment chooses the PLC controller for use, the PLC controller is convenient for install, and is with low costs, convenient to use.

Illustratively, as shown in fig. 1, the air handling unit further includes atemperature transmitter 5, and thetemperature transmitter 5 is electrically connected to thetemperature sensor 4 and thecontrol unit 6, respectively. Thetemperature transmitter 5 converts the temperature signal collected by thetemperature sensor 4 into an electric signal or other standardized output signals and transmits the electric signal or other standardized output signals to thecontrol unit 6.

In this embodiment, air handling unit is through addding temperature transmitter, can be more accurate acquire refrigeration/heating coil department temperature, the control unit of being convenient for handles.

For example, theheating unit 7 in the present embodiment may be an electric heater, and the electric heater includes a fixed power electric heater and an adjustable power electric heater.

In this embodiment, when the power adjustable electric heater is selected, the power of the electric heater is selected to be P ═ C_P *Q*(T₁ -T₀ )；

Wherein P is the electric heater power, C_P Is the specific heat capacity of air at constant pressure, Q is the air mass flow of the air handling unit, T₁ Selecting the temperature of 5-10 ℃ (the upper threshold is 10 ℃ and the lower threshold is 5 ℃), and T₀ Selecting the lowest average temperature in winter.

It is understood that the power-adjustable electric heater can expand the application range of the air handling unit and is suitable for different working conditions or environments.

Illustratively, as shown in fig. 1, theheating unit 7, the cooling/heating coil 3 and thefan 2 are sequentially disposed in an air flow direction in theprocessing chamber 10.

This embodiment will heating element sets up between inlet end and refrigeration/heating coil, can be fast, the even heating refrigeration/heating coil department air reduces energy resource consumption, can prevent again refrigeration/heating coil is frozen and is damaged.

The utility model provides a ventilation system is piled to high temperature, including the aforesaid air treatment unit.

In this embodiment, the air handling unit is applied to the high temperature reactor ventilation system, so that the operation reliability of the high temperature reactor ventilation system can be improved.

It is to be understood that the above embodiments are merely exemplary embodiments that have been employed to illustrate the principles of the present invention, and that the present invention is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.

Claims (10)

1. An air handling unit is used for a high-temperature reactor ventilation system and is characterized by comprising a box body, a refrigerating/heating coil, a fan and a heating unit;

the box body is provided with a processing chamber, and an air inlet end and an air outlet end which are respectively communicated with the processing chamber;

the refrigerating/heating coil and the fan are both arranged in the processing chamber;

the heating unit sets up in the treatment chamber, and be located refrigeration/heating coil one side, the heating unit can be in air heating when the air temperature of refrigeration/heating coil department is less than preset threshold value.

2. The air handling unit of claim 1, further comprising a temperature sensor and a control unit;

the temperature sensor is arranged at the refrigerating/heating coil, and the control unit is electrically connected with the temperature sensor and the heating unit respectively;

and the control unit is used for controlling the starting and stopping of the heating unit according to the temperature signal acquired by the temperature sensor.

3. The air handling unit of claim 2, wherein the preset threshold includes a lower threshold and an upper threshold;

and when the fan operates and the temperature value corresponding to the temperature signal is not greater than the lower threshold, the control unit starts the heating unit.

4. The air handling unit of claim 3, wherein the control unit shuts down the heating unit when the fan stops operating or a temperature value corresponding to the temperature signal is not less than the upper threshold.

5. An air handling unit according to any of claims 1 to 4, wherein the predetermined threshold is 5 ℃ to 10 ℃.

6. An air handling unit according to any of claims 2 to 4, further comprising a temperature transmitter electrically connected to the temperature sensor and the control unit, respectively.

7. The air handling unit of any of claims 1 to 4, wherein the heating unit is an electric heater, the electric heater being a fixed power electric heater or an adjustable power electric heater.

8. The air handling unit of claim 7, wherein when the electric heater is a variable power electric heater, the power of the electric heater is selected to be P-C_P *Q*(T₁ -T₀ )；

Wherein P is the electric heater power, C_P Is the specific heat capacity of air at constant pressure, Q is the air mass flow of the air handling unit, T₁ Selecting the temperature of 5-10 ℃ and T₀ And selecting the lowest average temperature in winter.

9. The air handling unit of any of claims 1 to 4, wherein the heating unit, the cooling/heating coil and the fan are arranged sequentially in an airflow direction within the processing chamber.

10. A thermopile ventilation system comprising an air handling unit according to any one of claims 1 to 9.

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