JPH0719548Y2 - Pressure swing type mixed gas separator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Industrial Field of the Invention The present invention relates to a separation process for separating one or more kinds of gas in a mixed gas by two separation cylinders filled with a separating agent, and a separated gas. Pressure swing-type mixed gas separation device in which a regeneration process for removing gas from a separating agent is alternately performed by using a section, and in particular, the efficiency depends on the amount of inflow gas or discharge gas and the pressure and temperature of the inflow gas. The present invention relates to a device for performing good automatic driving.

In the pressure swing type mixed gas separation device as described above, it is the most efficient operation method to minimize the amount of separated gas used in the regeneration process. is there. Therefore,
In recent years, in such a mixed gas separation device, a variable throttle valve is provided in the flow path of the regenerating gas, and the pressure and temperature of the untreated mixed gas on the inlet side and the untreated mixed gas or discharge port. A sensor for detecting the flow rate of the processed gas on the side is provided, and the pressure, temperature, and flow rate detected by each sensor are digitalized and input to the micro computer.
It is becoming popular that a CPU (Central Processing Unit) performs an operation according to a program stored in a ROM (Read Only Memory) and the output signal thereof controls the opening of a variable throttle valve. However, if an incorrect detection value is input to the microcomputer due to an abnormality in the flow rate sensor, temperature sensor, or pressure sensor, the variable throttle valve cannot be controlled properly. If it is erroneously controlled in a small direction, the amount of treated gas used for regeneration will be insufficient, and the process will move to the separation process with insufficient regeneration, so that only insufficiently discharged gas will be discharged. However, if such an operation is continued, excess gas is adsorbed or absorbed by the separating agent and regeneration cannot be performed, and the expensive separating agent may be wasted.

Means for Solving the Problems The present invention is, as means for solving such problems,
As shown in FIG. 1, an abnormality detecting means for detecting an abnormality when the detection value of each sensor is out of a preset range, and a variable throttle valve is opened when the abnormality detecting means detects the abnormality. The control means for controlling the direction and the abnormality display means for displaying the abnormality are provided.

Function and effect The present invention has the above-mentioned configuration, and when each sensor has an abnormality,
The variable throttle valve is controlled in the opening direction to increase the amount of treated gas for regeneration, which reduces operating efficiency, but discharges a gas with a low degree of separation or causes the separation agent to become unnecessary for regeneration. Since the occurrence of the abnormality is displayed and the occurrence of the abnormality is displayed, it is possible to replace the sensor in which the abnormality has occurred at the time of communication and to shift to normal economic operation.

Embodiment An embodiment in which the present invention is applied to a dehumidifying device for pressurized air will be described below with reference to the accompanying drawings.

FIG. 2 shows the overall configuration of this embodiment. The high-pressure and high-humidity untreated air flowing in from the inlet 9 is in the first separation cylinder 6a filled with an adsorbent such as silica gel by opening the opening / closing valves 1a and 2a. Water vapor is adsorbed and separated by the adsorbent when passing through the air, and the dry air is discharged from the discharge port 8 and the second separation cylinder 6b communicates with the atmosphere from the discharge port 7 by opening the open / close valve 4b. However, a part of the low-humidity air discharged from the first separation cylinder 6a rapidly expands through the variable throttle valve 13 to become further low humidity, and then flows into the second separation cylinder 6b. In the adsorption process, the adsorbed water is taken from the adsorbent and dried to be regenerated and discharged from the discharge port 7. After a certain period of time, the open / close valve 4b is closed and the open / close valve 3b is opened, so that the treated high-pressure air is filled in the second separation cylinder 6b to increase the pressure, and then the open / close valves 1a and 2a are closed to open / close the open / close valve 4a. Is opened, the high pressure air remaining in the first separation cylinder 6a is discharged from the outlet 7, the open / close valves 1b and 2b are opened, and unprocessed high pressure air flows into the second separation cylinder 6b. Water that has been adsorbed by the regenerated adsorbent and dried air is discharged from the discharge port 8, and a part of the dried air is further expanded by passing through the variable throttle valve 13 and further dried, and then dried in the first separation cylinder 6a. It flows in, removes water from the adsorbent in it, dries it, and regenerates it. In this way, by alternately performing the adsorption and regeneration processes in the first separation cylinder 6a and the second separation cylinder 6b, it is possible to continuously obtain dry air from which moisture has been removed from humid air. In addition, 5a and 5b are drain cocks, and 10 is a drain discharge port.

Further, a pressure sensor 15 and a temperature sensor 16 are attached to the inflow port 9 for the untreated air, and a flow rate sensor 17 is attached to the discharge port 8 so that they are input to the microcomputer 19 via the analog / digital conversion circuit 18. The output part of the microcomputer 19 is connected to the control part of the variable throttle valve 13.

As described above, in the conventionally known pressure swing type dehumidifier, the detection values of the pressure sensor 15, the temperature sensor 16 and the flow rate sensor 17 are digitalized and input to the CPU of the microcomputer 19, and stored in the ROM. The calculation is performed according to the program that is converted into control data,
The result is input from the output section to the control section of the variable throttle valve 13 to control the opening thereof. Although a detailed description of the above program is omitted, a larger flow rate, a higher intake air temperature, and a lower intake air pressure require a larger amount of regeneration air. Valve 13
Is controlled so that the opening degree of is increased.

In this embodiment, the program stored in the ROM of the microcomputer 19 has a flow chart shown in FIG. 3, and it is determined whether or not the data input to the CPU is abnormal. Whether or not the data is abnormal is determined by whether or not each data is within a range of values that can normally occur, and the allowable range is preliminarily entered in the ROM. When there is no abnormality in the data, the data is converted into control data and input to the control unit of the variable throttle valve 13 as usual, and highly efficient operation is continued. On the other hand, when an abnormality occurs in the data, the data conversion to the safety control is performed.
That is, the flow rate is converted to the maximum value in the allowable range, the intake air temperature is converted to the maximum value in the allowable range, and the intake pressure is converted to the minimum value in the allowable range, whereby the variable throttle valve 13 has the maximum opening degree. Therefore, it is possible to prevent the discharge of high-humidity air having a low efficiency, but the possibility that the adsorbent cannot be regenerated. At the same time, the abnormal portion is discriminated, the warning lamp 20 is turned on, and the occurrence of the abnormality and the portion thereof are displayed.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of the present invention, FIG. 2 is an overall configuration diagram of an embodiment of the present invention, and FIG. 3 is a flow chart of a program written in the ROM of the microcomputer which is the main body of the control device. Is. 6a, 6b: Separation cylinder, 8: Discharge port, 9: Inlet port, 15: Pressure sensor,
16: Temperature sensor, 17: Flow rate sensor, 19: Microcomputer, 20: Warning lamp

Claims (1)

[Scope of utility model registration request] 1. Two separation cylinders filled with a separating agent such as an adsorbent and an absorbent are provided, and an untreated mixed gas flowing from an inlet is supplied to one of the separation cylinders at a high pressure to obtain one kind or A separation process in which a treated gas separated by adsorbing or absorbing two or more kinds of gases in the separating agent is discharged from a discharge port, and a part of the treated gas discharged from the other separating cylinder is a variable throttle valve. And a regeneration process in which the gas that has been adsorbed or absorbed by the separating agent is removed from the separating agent and is discharged from the exhaust port by reducing the pressure of the gas through the exhaust port. While performing alternately, the pressure and temperature of the untreated mixed gas on the inlet side and sensors for detecting the flow rate of the untreated mixed gas or the treated gas on the outlet side are separately provided, Based on the detection value of each sensor In a pressure swing type mixed gas separation device that controls the opening of the variable throttle valve to perform efficient operation, detects an abnormality when the detection value of each sensor is out of a preset range A pressure slewing type mixing means, which is provided with an abnormality detection means for controlling the variable throttle valve in the opening direction when the abnormality detection means detects an abnormality, and an abnormality display means for displaying the abnormality. Gas separator