JPH0792306B2 - Air volume adjustment control device in electric room in rolling equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Industrial field of application) The present invention provides an induction fan group for cooling various electric devices of ferrous and non-ferrous metal rolling equipment and electric motors that drive auxiliary machines other than rolling mills. The present invention relates to an air volume adjustment control device in an electric room in a rolling mill for compensating the air volume and the air pressure in the electric room by controlling the rotation speed of a forced draft fan and an induction fan group that blows cooling air taken in from the outside air into the stored electric room.

(Prior Art) In ferrous and non-ferrous metal rolling equipment, an induction fan group that cools various electric devices required for operation control and electric motors that drive auxiliary machines other than rolling mills is housed in an electric chamber.
Therefore, when operating the rolling equipment, the heat generated from various electric devices raises the room temperature, and at the same time, the heat of the electric devices itself causes deterioration of the insulation used in the equipment. There is a need to. Incidentally, the insulator used in the electric device deteriorates with the passage of time even when the temperature is low, but as the temperature rises, the deterioration rate becomes faster.

Conventionally, in order to cool various electric equipment in such an electric room, outside air is taken in from the outside, and a forced air blower provided at an electric room opening communicating with the outside is used to blow air into the electric room to cool the electric equipment. I have to.

FIG. 3 shows an outline of an electric room accommodating various electric equipment of a rolling facility and an air blow path by a forced air blower. Third
As shown in the figure, in the electric room 1, a DC electric motor 2 used as a main electric motor for driving a rolling mill, a computer room equipped with air conditioning cooling and heating equipment, and an AC board 4 are installed, respectively. Underground transformer 5, reactor
6, electric devices such as circuit breaker 7 are installed. A plurality of push blowers 8 are provided on the outer wall of such an electric room 1,
The outside air introduced through the air filter 9 is blown to the underground of the electric room 1, and the air that has exchanged heat with various electric devices is introduced into the electric room 1, and a part of the air is exhausted to the outside by the exhaust ventilation fan 10. The other part is exhausted into the building 12 adjacent to the electric room by the exhaust ventilation fan 11. In addition, a part of the wind introduced into the basement of the electric room 1 is introduced into the heat exchange chamber 14 provided immediately below the main motor through the makeup filter 13, and the heat exchanged here is the fan 15 for cooling the main engine. After being introduced into the DC motor 2 by means of to cool the commutator portion, it is exhausted to the basement of the building 12 by the commutator exhaust ventilation fan 16. Furthermore, for the auxiliary electric motor group 17 that drives auxiliary machines other than rolling mills installed in the building 12, an induction fan group 18 attached to the partition wall between the underground of the electric room 1 and the underground of the building 12 is used. A part of the wind introduced into the underground of the electric room 1 is sent to the inside of the machine through the buried wind pipe 19 to be cooled.

By the way, when cooling various equipments in the room with cooling air, neither the forced air blower nor the induction fan have their air volumes adjusted, which is the original plan standard of 100.
The number of facilities determined as% RMS load is operating at a constant commercial frequency. In rare cases, considering the outside air temperature of the electric room, for example, in summer and winter, the number of induction fans is selected and operated without adjusting the air volume of the forced draft fan.

(Problems to be solved by the invention) However, in such a cooling system that wind-cools various electric devices in the electric room, the forced blower and the induction fan group for the number determined as 100% RMS load are constantly operated, Even if the outside air temperature of the electric room, the main motor, and the cooling air flow of the auxiliary electric motors in the building change, the air flow of the forced draft blower is not controlled, and thus various electric devices are generally overcooled.
Therefore, the power consumption increases, and no consideration is given to energy saving. As an electric motor for driving auxiliary machines other than rolling mills, a variable speed adjustment is easy, including a control method, and the most efficient DC motor is mainly used in terms of investment efficiency and installation area. When the DC motor is used in the above-described supercooled atmosphere, chattering occurs in the rectifying portion of the DC machine, which is troublesome for maintenance, and causes kappa docking.

Therefore, an object of the present invention is to provide an air volume adjustment control device in an electric room in a rolling facility, which can operate various electric devices in the electric room in an optimum state and can save energy.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve such an object, the present invention provides various electric devices including a main motor of a ferrous / non-ferrous metal rolling facility installed in an electric room, and an electric room adjacent to the electric room. Induction fan group that cools the auxiliary machine electric motor group on the side of the building next to the electric room that drives auxiliary machines other than rolling mills installed in the building, and multiple that cools various electric devices in the electric room by taking in external air A first calculation for estimating and calculating the effective load capacity of all electric motors based on the rolling schedule of the rolling equipment, rolling parameters, and non-rolling material product data in an electric room air-cooling equipment composed of a forced draft fan. Means, second calculating means for calculating an estimated air flow rate required for cooling based on the effective value load capacity of each auxiliary electric motor obtained by the first calculating means, and the first calculating means. Effectiveness of all electric motors A third calculation means for calculating the amount of heat generated by the electric device based on the load capacity and calculating the air flow rate based on the outside air temperature, and cooling each auxiliary electric motor based on the estimated air flow rate calculated by the second calculation means. The required air volume is calculated for each group of induction fan groups, and when it is determined that the temperature detection value of the auxiliary electric motor group exceeds the required temperature increase limit, the auxiliary air electric motor group is corrected by correcting the air volume. Fourth arithmetic means for controlling the rotation speed of the induction fan group to be cooled, and the air volume having the larger value is determined from the arithmetic results of the third arithmetic means and the fourth arithmetic means, and the temperature in the electric room is detected. When it is determined from the values that the temperature rise of each device exceeds the required limit, the determination and correction calculation means for correcting the determination air volume to control the rotation speed of the electric room forced air blower is provided.

(Operation) Therefore, in such an air flow rate control device for an electric room in a rolling mill, the load is predicted from the operation schedule of the rolling mill, and the difference between this predicted value and the facility plan of the outside air temperature and constraint conditions are set. The rotation speed is controlled in order to adjust the air volume and pressure of the forced draft fan and the induction fan group in consideration, so it is possible to always operate various electric devices in the electric room and the auxiliary electric motor group in the building in the optimum state. Moreover, it becomes possible to greatly contribute to energy saving.

(Embodiment) First, the basic idea of the present invention will be described before an embodiment of the air volume control device for an electric chamber in a rolling mill according to the present invention is described.

The wind cooling system of the electric room shown in FIG. 3 is shown in a flow chart of FIG. That is, after the outside air is taken in from the outside 21 to remove dirt, dust, etc. by the air filter 9, the air is blown into the electric room 1 by the forced air blower 8 to cool various electric devices in the electric room to increase the temperature within a predetermined range. At the same time, the electric room pressure is set to a constant positive pressure to prevent backflow from the outside air. The wind pushed into the chamber 1 cools the main motor 2, a makeup filter 13, an induction fan group 18 for cooling the auxiliary motor 17, and an exhaust fan 10, 11 for ventilation of the electric chamber 1. Are discharged to the outside 21 and the plant side building (mil yard) 12.

Therefore, in such an air cooling system, the air volume and the air pressure of the forced air blower 8 of the electric room 1 are determined by the following factors.

(1) The amount of air that is determined by the outside air temperature of the room 1, the temperature rise limit of various electric devices in the electric chamber 1, and the amount of heat generated from various electric devices (2) The amount of air discharged from the electric chamber 1 (3) The inside of the electric chamber 1 There is a certain positive pressure, and the air volume of the forced draft fan is determined by the larger of the air volumes calculated in (1) or (2), and the air pressure is based on the result of (2). It is decided in consideration of the item (3).

The item (1) of the air volume determining factor is the exhaust air from the electric room 1,
That is, it is determined by the difference between the temperature rise limit of various electric devices and the outside air temperature, and the air flow rate is decided so that the air temperature in the electric room 1 does not rise abnormally above a certain value. Here, the heat generated by the equipment installed in the electric room 1 is divided into a portion that changes according to the load (power converter, power equipment, etc.) and a portion of constant heat generation (control power generation heat, etc.). Further, the amount of air discharged from the electric chamber 1 in the item (2) is determined by the amount of auxiliary cooling air blown by the auxiliary motor group, and the amount of air is determined by the load.

Therefore, in the present invention, the prediction of the load is obtained from the rolling schedule, and the required air volume of the forced draft fan and the induction fan is determined by the following calculation according to the load.

The required air flow Q _A of the forced draft fan is between the outside air temperature T _I (1)
There is a relationship like an expression.

Here, Q _A : Required cooling air volume (m ³ / min) W: Equipment generated loss in the electric room (kw), r: Air specific weight (kg / m ³ ), C _P : Low pressure specific heat of air (kcal / kg)・ ℃), T _I : outdoor temperature, T ₀ : discharge temperature.

The loss w generated by the equipment in the electric room can be represented by a loss wf corresponding to the load and a fixed loss wg.

w = wf + wg (2) Next, the required air volume of the induction fan is determined by the load of the auxiliary electric motor, and the wind pressure is the required wind pressure required by the auxiliary electric motor. The auxiliary electric motor group is divided into several groups for cooling. In addition, the load of the auxiliary electric motor is divided into a machine that processes and conveys materials, that is, one that changes according to the rolling schedule and one that moves the machine to a predetermined position, that is, one with a constant load. _H is divided into the air volume Q _S determined by the rolling schedule and the air volume Q f of the fixed part, and the required air volume of the induction fan for each group can be determined.

Next, an embodiment based on the basic idea of the present invention described above will be described with reference to FIG. As shown in FIG. 1, the air volume adjustment control device for the electric room includes a first calculation means 31, a second calculation means 32, a third calculation means 33, a fourth calculation means 34, a determination and correction calculation means 35. Composed of.

The first calculation means 31 is product data (plate thickness, plate width, plate length)
40, material data (plate thickness, plate width, plate length) 41, rolling schedule (speed, reduction amount, grade) 42, rolling parameter (plate temperature, rolling pitch, cycle) 43 as input information, RMS of all electric motors The load capacity is calculated. That is, the RMS load RMSi of each motor is RMSi = f (W _I , W ₀ , t _I , t ₀ , L _I , L ₀ , v, Red, G, T ^S , P, C _Y ) ....
It can be represented by (3).

However, W _I : material weight, W ₀ : product load, t _I : material thickness or entry side thickness,
t ₀ : product thickness or delivery side thickness, L _I : material length, L ₀ : product length, v: rolling speed, Red: rolling reduction (t _I −t ₀ ) / t _I , G: grade, T ^S : Plate temperature, P: Rolling pitch, C _Y : Cycle Here, the above formula (3) represents RMSi as a general influencing factor, and a concrete example thereof is as follows.

For example, the required power L of the main motor can be expressed as L = A / η · Gv / R. However, η: mechanical efficiency, G: rolling torque, v: rolling speed, R: rolling roll radius.

Further, G is G = aF (a: torque coefficient, F: rolling load).

Furthermore, F is Here, Q _P, the symbol kfm is used in rolling theory, those of the type described below are shown as examples of the general formula as approximate solutions have been put to practical use.

However, A, B, C are constants.

Further, kfm = Feε ^D ε ^'E However, epsilon: strain, ε' ^E: a strain rate.

^{Fe = exp {0.126-1.75C + 0.594C 2} + (2.851 + 2.968C-1.120C 2) / Ts} where, C is one which is based on the carbon content by a factor of grades, between iron heat The deformation resistance of the rolling mill is an example of a simple type. Note that R'is a roll flat radius and is not directly related here, and therefore omitted.

The acceleration / deceleration power determined by the above acceleration / deceleration torque GD ² dN / dt × 2 (assuming the same acceleration / deceleration) is Lacc / DEC, the time required for acceleration / deceleration is tacc / DEC, and the rolling time is the rolling material.
L _I, when the rolling pitch when rolled during steady rolling speed v and P, RMS load RMSi main motor Becomes

In the above, in the first computing means 31,
Although the case where the RMS load is calculated has been described, the RMS load is calculated for each of the other electric motors as described above.

The second calculating means 32 calculates the required cooling amount of each auxiliary electric motor based on the RMS load of each auxiliary electric motor among the RMS load capacities of all electric motors obtained by the first calculating means 31. That is, the auxiliary electric motor 17 is divided into three cases, one for processing rolled material, one for transporting rolled material, and one for moving the machine. The former two cases are calculated by the first computing means 31 according to the contents shown in the equation (1). The required RMS value changes, and the latter case has a fixed load. Therefore, the second arithmetic means 32 stores the required air volume for each electric motor in the fixed load table for the fixed load, and the first arithmetic means 31 for the variable load.
RMS of each auxiliary motor calculated based on equation (1)
The required characteristic air volume is extracted from the RMSn vs. required air volume data characteristic prepared for each motor according to the load capacity.

The third calculating means 33 calculates the heat loss of the corresponding equipment for each constituent element of the storage equipment in the electric room based on the RMS load capacity of all the motors calculated by the first calculating means 31, and the total heat loss. The amount of cooling air is calculated from the outside air temperature detected by the outside air temperature detector 44. In this case, when calculating the heat loss, the target drive equipment that has a fixed RMS load and those that operate at a constant load such as control power supply components are calculated as a fixed heat loss wg (kw). For the storage device for the ring, the heat loss is calculated for each of the component devices (transformer, reactor, AC panel, power converter, etc.) and the total heat loss wf (kw) is calculated (in this fluctuation RMS Is also included in the electric room forced air blower heat loss). And
Fixed heat loss wg calculated in this way, RMS link heat loss
Based on equation (1), the required cooling air volume Q _A for the electrical room storage equipment is calculated from wf, the outside air temperature T _I detected by the outside air temperature detector 44, and the temperature rise limit T _{0 of the} storage equipment.

The fourth calculation means 34 is a group-specific attracting fan air volume calculation means.
34a, an air volume target value calculation means 34b is provided, and the group-by-group induction fan air volume calculation means 34a is provided for the required air volume fixed load equivalent Qfn and RMS load link Qsn of each auxiliary electric motor obtained from the second calculation means 32. Based on the group, the air volume Q _H n of each induction fan is calculated, and the air volume target value calculation means 34b uses the air volume Q _H n of each induction fan calculated by the group induction fan air volume calculation means 34a. The characteristic value satisfying the air volume and the air pressure is judged from the characteristic data of (1) to calculate the air volume target value, and this air volume target value is given to the VVVF control device 46 for controlling the drive motor 18a of the induction fan 18 as a rotation speed reference signal. In this case, the attraction fan air volume calculation means 34a for each group
In calculating the air volume Q _H n of each induction fan, the auxiliary motor temperature detector 45c is used by the auxiliary motor group temperature monitor 34c.
The temperature of the auxiliary electric motor group is monitored by inputting the temperature detection signal detected by the above, and the correction amount (1 + α) is calculated by the correction means 34d so that the corresponding electric motor does not exceed the allowable temperature limit. The air flow rate Q _H n of each induction fan is multiplied by (1 + α) times to the means 34a.

The judgment and correction calculation means 35 is a necessary calculation air quantity Q _A calculated by the third calculation means 33 by the judgment means 35 a for cooling the electric room housing equipment and a group-specific attraction fan air quantity Q calculated by the fourth calculation means 34. _H is compared and judged, and the larger value is given to the forced blower target value setting means 35b to be used as the forced blower target value. In this case, in setting the target value, the temperature detection signal detected by the electric room temperature detector 47 is input to the electric room temperature monitoring device 35c to monitor the temperature inside the electric room, and the temperature inside the electric room is The correction amount (1 + β) obtained by the correction unit 35d so as not to exceed the allowable limit is given to the forced draft fan target value setting unit 35b to multiply the target value by (1 + β). Then, based on the target value set by the target value setting means 35b, the internal pressure determination means 35e checks whether or not the electric room pressure is a constant value by the equation (4). If the internal pressure is constant, the push blower 8 The VVVF control device 48 for controlling the drive motor 8a judges the characteristic satisfying the air volume and the air pressure from the characteristic data of the forced draft fan 8 and gives the rotation speed reference output.

Here, the electric room pressure is ΔP _EP = P−ΔP _F −ΔP _L (4) where P: blower air pressure (mmAg) ΔP _F : filter and louver loss before filter (mmAg) ΔP _L : ventilation resistance In the present embodiment, the RMS load capacity of all electric motors is calculated by the first computing means 31 based on the product data, material data, rolling schedule and rolling parameters, and
The required cooling amount of each auxiliary electric motor is extracted from a table prepared in advance for a fixed load by the calculation means 32 of the above, and the auxiliary motor group of the auxiliary electric motor group obtained by the first calculation means 31 for a variable load is extracted. RMS specified for each motor based on RMS load capacity
Extract the required cooling air volume from the characteristics of n vs. required air volume data,
Furthermore, the heat loss of each storage device in the electric room is calculated by the third calculation means 33 based on the RMS load capacity of all the electric motors obtained by the first calculation means 31, divided into a fixed load and a variable load, respectively. Based on the fixed heat loss, the RMS link heat loss, the outside air temperature, and the temperature rise limit of the storage equipment, the required cooling air volume for the electrical storage equipment is calculated using equation (1). And
The fourth arithmetic means 34 calculates the air volume of each induction fan 18 for each group based on the required air volume of each auxiliary electric motor calculated by the second arithmetic means 32, and at the same time, calculates the air volume and the air pressure based on the characteristic data of the induction fan 18. Is calculated to control the rotation speed of the induction fan 18 so that a predetermined air volume can be obtained from the induction fan 18. Further, the judgment and correction calculation means 35 compares the required air volume for cooling the electric room calculated by the third calculation means 33 with the group-specific induction fan air quantity obtained by the fourth calculation means 34, and a large value is obtained. Is set as the target value of the forced draft blower, and at the same time, it is checked whether or not the target value is a constant value of the electric room pressure. If the internal pressure is constant, the rotation speed of the forced draft fan 8 is controlled, and the forced blower 8 sets a predetermined value. I try to get the air volume.

Therefore, since the air volume of the forced draft blower 8 and the air volume of the induction fan 18 are controlled according to the heat loss generated in each storage device in the electric room and the load on each drive device, the target cooling device should always be operated in a comfortable state. Moreover, since the power of each blower is proportional to the cube of the air volume, a significant energy saving can be achieved.

Further, the air flow rate of the forced draft fan 8 and the air flow rate of the induction fan 18 are obtained based on the rolling schedule of the first computing means 31, but the air flow rate of the induction fan 18 is determined by the temperature of the auxiliary motor group. Since it is monitored and corrected so as not to exceed the allowable limit, and the air flow rate of the forced draft fan 8 is also monitored and corrected so as not to exceed the allowable limit. It is possible to control the air volume that matches the actual load of.

[Effects of the Invention] As described above, according to the present invention, the load is predicted from the operation schedule of the rolling mill, and the forced draft fan and the difference between the predicted value and the facility plan of the outside air temperature and the constraint condition are taken into consideration. Since the rotation speed is controlled to adjust the air volume and pressure of the induction fan group, it is possible to always operate various electric devices in the electric room and the auxiliary electric motor group in the building in an optimal state and save energy. It is possible to provide an air volume adjustment control device in an electric room in a rolling facility that can be achieved.

[Brief description of drawings]

FIG. 1 is a block configuration diagram showing an embodiment of an air volume adjustment control device in an electric room in a rolling mill according to the present invention, FIG. 2 is a wind cooling system diagram of the electric room for explaining the present invention, and FIG.
FIG. 1 is a system configuration diagram showing a specific example for wind-cooling various electric devices in an electric room in rolling equipment. 8 ... Push blower, 18 ... Induction fan, 31 ... First computing means, 32 ... Second computing means, 33 ... Third computing means, 34 ... Fourth computing means, 34a ... … Induction fan air volume calculation means by group, 34b …… Air volume target value calculation means, 34c…
… Auxiliary motor group temperature monitoring device, 34d… Correction means, 35…
... Judgment and correction calculation means, 35a ... Judgment means, 35b ...
Push blower target value setting means, 35c ... electric room temperature monitoring device, 35d ... correction means, 35e ... internal pressure determination means.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Sumio Matsumori 1 Fuji-cho, Hirohata-ku, Himeji-shi, Hyogo Nippon Steel Corporation Hirohata Works (56) Reference JP-A-61-225567 (JP, A)

Claims (1)

[Claims] 1. A building adjacent to an electric room for driving various electric devices including a main motor of a ferrous / non-ferrous metal rolling facility installed in the electric room and auxiliary machines other than a rolling mill installed in a building adjacent to the electric room. In the electric room air-cooling equipment composed of an induction fan group that cools the auxiliary electric motor group and a plurality of forced air blowers that take in external air to cool various electric equipment of the electric room, First calculating means for estimating and calculating the effective load capacity of all electric motors based on the rolling schedule, rolling parameters, and non-rolling material product data, and the effective value of each auxiliary electric motor obtained by the first calculating means. Second calculating means for calculating an estimated blown air amount required for cooling based on the load capacity, and an amount of heat generated by the electric device based on the effective load capacity of all the electric motors obtained by the first calculating means and the outside air Send by temperature A third calculating means for calculating the amount, and an air amount required for each group unit of the induction fan group that cools each auxiliary electric motor based on the estimated air flow amount obtained by the second calculating means, and When it is determined that the detected temperature value of the auxiliary electric motor group exceeds the required temperature increase limit, a fourth arithmetic means for correcting the air volume to control the rotation speed of the induction fan group for cooling the auxiliary electric motor group. When the air volume of the larger value is determined from the calculation results of the third calculation means and the fourth calculation means, and it is determined from the temperature detection value in the electric room that the temperature rise of each device exceeds the required limit. An air volume adjustment control device for an electric room in a rolling mill, comprising: a determination and correction calculation means for correcting the determination air volume to control the rotation speed of the electric room forced air blower.