JPH0725464A - Controller for pulverulent body trasfer processor - Google Patents

Abstract

PURPOSE:To shorten a time taken for drawing gas out of a reactor by restraining the speed of gas passing through a gas filter cloth within an allowable extent while preventing the cloth from breakage. CONSTITUTION:When a flow regulating valve 3 is opened, gas in a reactor 1 enters a gas filter 2 through a piping 6 and further ejected through a piping 7. Pressure in the gas filter 2 is detected by a pressure gauge 8. An amplifier 9, flow meter 5 and flow regulation meter 4 cooperating with each other throttle the opening of the valve 3 when the internal pressure in the gas filter is small and enlarge the opening of the valve 3 when the internal pressure in the gas filter is large. Pressure in the reactor 1 is detected by a pressure gage 10, and a set value of the gas filter pressure corresponding to the internal pressure in the reactor is obtained from a function generator 11. The pressure regulation meter 12 regulates the opening of the pressure regulating valve 13 so that the internal pressure in the gas filter is the set value of the gas filter pressure. As a result, when the internal pressure in the reactor is large, the internal pressure in the gas filter is heightened, the opening of the valve 3 is enlarged and degassing can be quickly carried out.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a controller for a powder transfer process device, which is capable of preventing damage to the device during degassing and shortening the time taken for degassing from a reactor.

[0002]

2. Description of the Related Art A powder transfer process apparatus previously developed by the inventor of the present application will be described with reference to FIG. The reactor 1 is filled with powder or mist together with gas. The gas filter 2 removes the powder or mist carried along with the gas when the gas is extracted from the reactor 1. The reactor 1 and the gas filter 2 are connected by a pipe 6, and the pipe 6 is provided with a flow rate control valve 3 and a flow meter 5. The signal detected by the flow meter 5 is sent to the flow controller 4. The gas that has passed through the gas filter 2 is discharged through the pipe 7.

Further, a pressure gauge 8 for a gas filter for detecting the pressure inside the gas filter 2 and an amplifier 9 are provided. When the output signal of the pressure gauge 8 is input, the amplifier 9 calculates the inflow flow rate at which the gas filter cloth passing speed becomes constant, and the calculation result is given to the flow rate controller 4 as a set value. The flow rate controller 4 adjusts the opening degree of the flow rate control valve 3 so that the flow rate value detected by the flow meter 5 becomes equal to the value calculated by the amplifier 9.

The relationship between the internal pressure of the gas filter 2 and the flow rate of gas flowing into the gas filter 2 is expressed by the following equation. F = a · P · A · v = k · P (1) where F: flow rate (mass flow rate) P: gas filter pressure A: gas filter cross-sectional area v: gas filter filter cloth passing speed a: constant k: constant : A ・ A ・ v

As described above, given the filter cloth passage allowable speed v and the gas filter cross-sectional area A which are determined by the specifications of the gas filter 2, the gas filter inflow flow rate F is obtained.
Is obtained in proportion to the pressure P. As a result, the gas filter inflow flow rate setting amount can be temporally changed as the gas filter pressure, which is the output signal from the pressure gauge 8, fluctuates moment by moment.

[0006] For example, when the pressure inside the gas filter 2 is low, the flow rate setting amount becomes small, and the command value from the flow rate controller 4 works in the direction of narrowing the opening of the flow rate control valve 3 and the flow rate flowing into the gas filter 2 is decreased. Suppress. On the other hand, the higher the pressure, the larger the flow rate set value, so the command value from the flow rate controller 4 works in the direction to open the opening of the flow rate control valve 3 and the inflow rate of the gas filter 2 increases. In any case, it is guaranteed that the filter cloth passing speed can be suppressed within the gas filter filter cloth allowable range.

As described above, by changing the gas filter flow rate control set value in accordance with the pressure fluctuation of the gas filter 2, it becomes possible to keep the gas filter filter cloth passing speed within an allowable range, and the gas filter 2 is damaged. Can be prevented.

[0008]

As shown in FIG. 4, in the control method using only the flow rate control, the volumetric flow rate flowing into the gas filter 2 is constant and the mass flow rate is determined in proportion to the pressure inside the gas filter 2. Therefore, if the pressure inside the gas filter 2 is low, even if the pressure inside the reactor 1 is high,
The mass flow rate extracted from the reactor 1 is reduced and it takes a long time to recover the gas, and there remains a problem that the entire amount of gas cannot be extracted from the reactor 1 within a predetermined time.

In view of the above situation, the present invention is a control device for a powder transfer process apparatus, which can realize an operation of suppressing the speed at which gas passes through a filter cloth of a gas filter within an allowable range and quickly withdrawing gas from a reactor. The purpose is to provide.

[0010]

The structure of the present invention for solving the above problems is a reactor in which powder or mist transferred by batch processing by opening and closing a valve is filled with gas, and when the gas is extracted from the reactor. In a powder transfer process device equipped with a gas filter that removes powder or mist carried along with gas, input the pressure gauge for the gas filter that detects the pressure of the gas filter and the output signal of this pressure gauge An amplifier that performs an operation to keep the volumetric flow rate of the gas filter at a predetermined value, a flow meter provided in the inlet flow path of the gas filter, and a detection signal of this flow meter as a control amount to output the output signal of the amplifier. As a set amount, a flow rate controller that controls the opening of the flow rate control valve provided in the flow path connecting the reactor and the gas filter is provided. Further, a pressure gauge for the reactor that detects the pressure inside the reactor, a function generator that determines the pressure set value of the gas filter based on the output signal of the pressure gauge for the reactor, and a pressure gauge for the gas filter. And a pressure controller that uses the value of the output signal as a control amount and the pressure set value as a set amount, and the opening degree of a pressure control valve provided in the outlet flow path of the gas filter as an operation amount. It is characterized by

[0011]

Since the present invention is constructed as described above, it has the following actions. That is, since the gas filter pressure setting amount is changed in proportion to the internal pressure of the reactor, the gas filter pressure becomes high when the reactor pressure is high, and as a result, the gas filter flow rate setting amount is also proportional to the gas filter pressure. As a result, the gas filter flow rate (mass flow rate) also increases, so that the gas extraction time from the reactor is shortened.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. The same parts as those in the prior art are designated by the same reference numerals. Figure 1
As shown in FIG. 3, in the present embodiment, a pressure gauge 10 for the reactor for detecting the pressure of the reactor 1, a function generator 11, and a pressure control valve 13 for controlling the pressure of the reactor 1 are further added to the conventional apparatus. A pressure controller 12 is provided. When the output signal of the pressure gauge 10 is input to the function generator 11, the gas filter pressure set value is calculated, and the calculation result is given to the pressure controller 12 as the set value. Pressure controller 12
Is the pressure control valve 1 so that the pressure of the gas filter 2 detected by the pressure gauge 8 becomes equal to the value calculated by the function generator 11.
Adjust the opening of 3.

The relational expression between the pressure and the flow rate is obtained by the following expression. _{F = a · P 2 · A} · v = k · P 2 ... (2) However F: flow rate (mass flow rate) P _2: Gas Filter Pressure A: Gas filter cross-sectional area v: Gas filter cloth passing speed a: constant k: constant = a · A · v

FIG. 2 shows an example of the relationship between the gas filter pressure set value, which is the output signal of the function generator 11, and the pressure of the reactor 1. P _{2 set} ∝ P ₁ P _{2 set} : Gas filter pressure set value P ₁ : Reactor pressure

As shown above, given the filter cloth passage allowable speed v and the gas filter cross-sectional area A which are determined from the specifications of the gas filter 2, the gas filter inflow flow rate F is determined in proportion to the gas filter pressure P _2. To be on the other hand,
Gas filter pressure P _2, since control is performed so that the pressure commensurate with the reactor pressure P _1, when the high reactor pressure P ₁ is controlled to be higher gas filter pressure P _2, the gas filter inlet flow The set amount also increases. As a result, the gas filter inflow flow rate F is increased, so that the reactor withdrawal amount is increased and the reactor gas withdrawal time is shortened.

An example of the process behavior will be specifically described with reference to FIGS. 3 (a) and 3 (b). For example, when the gas is extracted from the state where the flow rate control valve 3 is fully closed and the pressure control valve 13 is fully closed at the initial stage of degassing, the flow rate control valve 3 becomes fully closed → open and the filter cloth passing acceleration v (reactor passing volume) is reached. Flow rate) to a constant value within the allowable range. The pressure control valve 13 is fully closed until the gas filter pressure P ₂ reaches the set value calculated from the function generator 11, and the gas filter pressure P ₂ rises,
The gas extraction flow rate F (mass flow rate) also increases.

Compared with the conventional method, the gas is withdrawn from the reactor earlier as the gas withdrawal flow rate F increases, and the recovery time is shortened. After the gas filter pressure is increased to the set pressure, the pressure control valve 13 starts to open,
The gas filter pressure P ₂ drops with the reactor pressure P ₁ . When the reactor pressure P ₁ becomes low, the filter cloth passing speed starts to decrease, and the pressure control valve 13 and the flow rate control valve 3 are also fully opened.

[0018]

As described in detail with the above embodiments, by applying the controller of the powder transfer process apparatus according to the present invention, the gas filter pressure can be set according to the change of the reactor pressure. The gas filter flow rate control setting value can be changed, the flow rate gas filter cloth passing speed can be suppressed within the allowable range, and the reactor gas extraction amount can be increased, so that the gas extraction can be performed in a predetermined time.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of the present invention.

FIG. 2 is a characteristic diagram showing a relationship between an output of a pressure gauge for a reactor and an output of a function generator.

FIG. 3 is a characteristic diagram showing a behavior of a process in a related manner in the related art.

FIG. 4 is a configuration diagram showing a conventional technique.

[Explanation of symbols]

 1 Reactor 2 Gas Filter 3 Flow Control Valve 4 Flow Controller 5 Flow Meter 6 Piping 7 Gas Filter Piping 8 Pressure Gauge 9 Amplifier 10 Pressure Gauge 11 Function Generator 12 Pressure Regulator 13 Pressure Control Valve

Claims (1)

[Claims] 1. A reactor in which powder or mist transferred by batch processing by opening and closing a valve is filled with gas and a powder or mist carried along with the gas when the gas is extracted from the reactor is removed. In a powder transfer process device equipped with a gas filter, a pressure gauge for the gas filter that detects the pressure of the gas filter, and an operation that uses the output signal of this pressure gauge as an input to keep the volumetric flow rate of the gas filter at a specified value. An amplifier for performing the above, a flow meter provided in the inlet flow path of the gas filter, and a detection signal of the flow meter as a control amount and an output signal of the amplifier as a set amount, provided in the flow path connecting the reactor and the gas filter. A reactor equipped with a flow controller that uses the opening of the specified flow control valve as an operation amount, and further detects the pressure inside the reactor. And a function generator that determines the pressure setting value of the gas filter based on the output signal of the pressure gauge for this reactor, and the value of the output signal of the pressure gauge for the gas filter as the controlled variable. A powder transfer process comprising: a pressure controller having the pressure set value as a set amount and an opening of a pressure control valve provided in an outlet channel of the gas filter as an operation amount. The control device of the device.