JP2010169340A - Deodorizing device and safety operating method therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem in a deodorizing device in which VOC (volatile Organic Compound) is continuously treated, and a static pressure regulator is doubled to improve safety as a static pressure of an exhaust duct is an important observation value in determining a treatment amount of a VOC-containing gas by measuring the static pressure of the exhaust dust, that a continuous operation of a manufacturing device and its safety can not be secured as the deodorizing device may be operated on the basis of an incorrect static value when both of static pressure regulators are failed. <P>SOLUTION: A control device (10) receiving an abnormal signal Ss from the static pressure regulator (12) properly operates air distribution fans (16, 18) and dampers (30-35) to set them in predetermined fixed operating states. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a deodorizing apparatus for volatile organic compounds. In particular, the present invention has two systems of untreated gas paths, a ventilation path from a volatile gas generation source to the deodorizing means, and a discharge path to the atmosphere, and controls the static pressure of the blowing fan in each path. The present invention relates to a deodorizing device in which a regulator is duplicated and a safe driving method thereof.

  Since many organic solvents have high solubility and low boiling points, they are widely used as solvents and cleaning liquids for paints. However, many organic solvents have molecular structures similar to biological materials, and if they are sucked as they are, they may affect the human body. Those having particularly high volatility are called volatile organic compounds (hereinafter referred to as “VOC”). VOCs are often indegradable and thus permeate to contaminate soil and groundwater, or when released into the atmosphere, are involved in the generation of oxidants and SPM (suspended particulate matter) by photochemical reaction. There is concern about the effects on the human body and the environment due to air pollution caused by VOCs.

  Thus, VOCs are decomposed and discharged to the atmosphere by methods such as combustion treatment, catalyst treatment, and microbial treatment. In other words, the use of an organic solvent and the decomposition treatment of VOC generated by the use of the organic solvent are selected according to the type, concentration, generation amount, etc. of VOC.

  In particular, when a large amount of VOC is decomposed, it is preferable in that the treatment by combustion can be quickly decomposed. However, in the decomposition process by combustion, since it is necessary to maintain the temperature of 700 ° C. to 900 ° C., there is a problem that the running cost is increased.

  Patent Document 1 discloses a heat storage type combustion treatment apparatus as a method for solving this problem. This combustion treatment apparatus superheats a heat storage chamber with a high-temperature gas after combustion, and allows untreated gas to pass through the heat storage chamber. Therefore, heat exchange from the burned gas to the untreated gas is performed to increase the combustion efficiency of the untreated gas.

  In a manufacturing plant that continuously uses a large amount of an organic solvent, a decomposition processing system for VOC generated in a manufacturing apparatus also becomes large. Then, if the decomposition processing system becomes uncontrollable due to a failure of the static pressure regulator or the like, there is an influence on the manufacturing apparatus that generates VOC, and a measure that can continue to operate safely is necessary so that the manufacturing apparatus is not stopped as much as possible. .

In such a case, a method for improving safety by performing dual process control is well known. Patent Document 2 discloses a system in which processing devices are duplicated and control is manually returned when both of the processing devices fail.
JP 2003-161424 A Japanese Patent No. 3303105

When the technique of Patent Document 2 is applied to the combustion processing apparatus of Patent Document 1, it is possible to obtain a highly safe automatic operation deodorization apparatus. However, in the case of a VOC combustion processing device installed in a manufacturing device that continues automatic operation for 24 hours, when the duplicated process control breaks down, it is possible to immediately respond to an emergency situation if the control is handed over manually. However, there is a need for a more reliable VOC deodorization apparatus and its safe driving method.

  The present invention has been conceived in view of the above problems, and in a VOC processing apparatus or processing system, when a duplicated process control fails, the operation can be automatically controlled with increased reliability without relying on human hands. A deodorizing apparatus and a safe driving method thereof are provided.

That is, the present invention
An exhaust duct for exhausting gas containing volatile compounds;
A doubled static pressure regulator provided in the exhaust duct and outputting a static pressure information of the exhaust duct and a self-diagnosis function;
At least one blower fan provided downstream of the static pressure regulator;
Deodorizing means connected to the main blower fan;
When the abnormal signal is received, a deodorizing device having a control device for controlling the blower fan to be fixed is provided.

In the deodorizing apparatus of the present invention,
The blower fan has a main blower fan that sends the volatile compound-containing gas from the exhaust duct to the deodorizing means, and a preliminary blower fan that discharges the volatile compound-containing gas into the atmosphere from the exhaust duct,
The said control apparatus provides the deodorizing apparatus which controls so that both the said main ventilation fan and the said preliminary ventilation fan may drive | operate by fixed output.

In the deodorizing apparatus of the present invention,
The blower fan has a main blower fan that sends the volatile compound-containing gas from the exhaust duct to the deodorizing means, and a preliminary blower fan that discharges the volatile compound-containing gas into the atmosphere from the exhaust duct,
The control device detects one of the main blower fan and the spare blower fan that was operating when the abnormal signal is received, and operates the detected blower fan at a fixed output. Also provided is a deodorizing device for controlling the odor.

In the deodorizing apparatus of the present invention,
The blower fan has a main blower fan that sends the volatile compound-containing gas from the exhaust duct to the deodorizing means, and a preliminary blower fan that discharges the volatile compound-containing gas into the atmosphere from the exhaust duct,
The control device also provides a deodorizing device that performs control so as to maintain the operating state of the blower fan that was operating when the abnormal signal is received.

In the deodorizing apparatus of the present invention,
The fixed output is a deodorizing device that is a weighted average over a predetermined time of a control parameter based on an operation history of the blower fan.

The operation method of the deodorizing apparatus of the present invention is as follows:
A deodorizing apparatus operating method in which a main air blowing fan, deodorizing means connected to the main air blowing fan, and a preliminary air blowing fan connected to an air discharge port are operated by a control device based on static pressure by a static pressure regulator. And
Receiving a failure signal of the static pressure regulator;
Provided is a safe operation method of a deodorizing apparatus including a step of performing a fixed operation of the main blower fan and the preliminary blower fan.

  Since the present invention continues to operate the blower fan in a predetermined state when both of the duplicated static pressure regulators fail, a manufacturing apparatus that generates VOC even if both static pressure regulators fail. It is possible to automatically cope with a failure without stopping the operation, avoid an abnormal operation of the deodorizing device, and continue safe operation.

  FIG. 1 shows the configuration of the processing system of the present invention. The deodorizing apparatus 1 according to the present invention includes a combustion furnace 14 and atmospheric discharge ports 37 and 38 as deodorizing means, an outside air intake port 36, a blower fan 18 to the combustion furnace, a blower fan 16 to the atmosphere, and an exhaust duct 40. It comprises a static pressure regulator 12 for measuring pressure, a control device 10 for managing the entire device, and dampers 30 to 35 provided in various places.

  The VOC generation source 70 is not particularly limited as long as it uses a volatile solvent. For example, it can be effectively used in a place where a processing apparatus for a high temperature drying process is installed. In general, most VOCs can be decomposed by the combustion process. Note that the VOC-containing gas is also referred to as a volatile compound-containing gas or simply VOC.

  The VOC is sucked into the apparatus of the present invention from the VOC generation source 70 through the exhaust duct 40. The number of exhaust ducts is not particularly limited, and any number of exhaust ducts may be installed. In the figure, the exhaust duct 40 is collectively shown. A damper 30 is connected in series to the exhaust duct 40, and it is selected whether or not to introduce VOC into the deodorizing apparatus 1 of the present invention.

  A static pressure adjuster 12 is disposed downstream of the damper 30. In the present specification, the direction closer to the origin of the airflow is upstream, and the reverse direction is called downstream. The static pressure regulator 12 detects the flow rate of the VOC flowing through the exhaust duct 40 based on the pressure difference between the pressure in the exhaust duct 40 and the atmosphere. The exhaust duct 40 is divided into a duct 41 that sends VOC to the deodorizing device side and a duct 42 that discharges VOC to the atmosphere, and is connected to the blower fans 16 and 18 via dampers 31 and 32.

  The blower fan 18 is a blower that sends VOC to the combustion furnace 14 and is called a main blower fan. The main blower fan 18 is connected to a damper 33a and a damper 34a via a duct 44. Each damper is connected to dampers 33b and 34b via combustion ducts 23 and 24 passing through the combustion furnace 14. The dampers 33 b and 34 b are connected to the atmospheric discharge port 38 through the duct 45.

  An outside air intake 36 is connected between the damper 32 and the main blower fan 18 via a damper 35.

  On the other hand, a damper 31 is connected to the duct 42 on the side that discharges VOC to the outside air. A blower fan 16 is connected to the downstream side of the damper 31. The blower fan 16 is a blower connected to the air discharge port 37 through a duct 46 and is called a preliminary blower fan. The main blower fan and the spare blower fan are collectively referred to as a blower fan.

  The control device 10 is electrically connected to at least the static pressure adjuster 12, the blower fans 16 and 18, the combustion furnace 14, and the dampers 30 to 35.

Next, each element will be described in detail. The control device 10 is a computer having a memory (not shown) and operating with control software recorded in the memory. It has a connection port for the connected element. The control device 10 may be a sequential control device assembled in hardware.

  The static pressure adjuster 12 measures the static pressure at a place where it is installed or a connected sensor. Moreover, it is electrically connected with the control apparatus 10, and the static pressure of the exhaust duct 40 is notified by the static pressure signal Sp. The static pressure regulator 12 is a dual system, and static pressure regulators having the same structure are arranged in pairs. Each static pressure regulator has a self-diagnosis function, and transmits a failure signal Ss to the control device 10 when a failure is detected.

  The blower fans 16 and 18 may determine the maximum output at the time of design by the amount of VOC to be processed. In order to perform fine control, a blower fan equipped with an inverter circuit is preferable. This is because the operating state can be controlled by frequency. However, it is not particularly limited. It is preferable that the blower fan is electrically connected to the control device 10 and can be operated and controlled by a drive signal from the control device 10.

  The blower fan includes a main blower fan 18 and a preliminary blower fan 16. The main blower fan 18 is a blower fan that sends VOC from the duct 40 to the combustion furnace 14. The preliminary blower fan 16 is a blower fan for releasing VOC to the atmosphere at the time of emergency such as failure or during maintenance and inspection of the deodorizing apparatus 1. Therefore, the main blower fan 18 and the preliminary blower fan 16 may use the same output in terms of performance.

  Further, the same type of signal can be prepared for the drive signal Cdm to the main blower fan 18 and the drive signal Cds to the auxiliary blower fan 16. In the deodorizing apparatus 1 of the present invention, each of the main blower fan 18 and the preliminary blower fan 16 includes at least three instructions: a fan operation instruction, a fan frequency instruction, and a fan fixed frequency instruction.

  The combustion furnace 14 includes a combustion chamber 20, heat storage chambers 22 a and 22 b, and combustion ducts 23 and 24. The combustion chamber 20 is a space having a burner 21 for burning fuel. The heat storage chambers 22a and 22b are formed of a porous material such as ceramic and can retain heat. There are two series of combustion ducts, and VOC flows through each duct in the opposite direction. As a result, the VOC from the combustion duct 23 is thermally decomposed in the combustion chamber 20 to become a processing gas and enters the heat storage chamber 22a. And it heat-exchanges in the thermal storage chamber 22a, and raises the temperature of the thermal storage chamber 22a.

  The VOC entering the combustion furnace 14 from the combustion duct 24 is heated in the heat storage chamber 22a and reaches a high temperature, and then passes through the combustion chamber 20. In this way, the untreated gas is warmed by the amount of heat of the exhaust gas after the combustion treatment to increase the combustion efficiency.

  The combustion furnace 14 performs a combustion operation according to an instruction Cb from the control device 10, and returns information such as the temperature in the combustion chamber 20, the fuel consumption rate, and the temperature of the heat storage chamber to the control device 10 as a status signal Sb. In this specification, the combustion furnace 14 is described as a regenerative direct combustion furnace, but other combustion furnaces may be used.

  Various dampers are disposed between the respective ducts, and the ducts are opened or closed according to an instruction Cd from the control device 10.

  Next, the normal operation state of the apparatus of FIG. 1 will be described. The control device 10 detects the temperatures of the combustion chamber 20 and the heat storage chambers 22a, 22b based on the state signal Sb from the combustion furnace 14, and instructs the instruction Cb and the drive signal to the main blower fan 18 so that each becomes a predetermined temperature. Control is performed by Cdm and the instruction Cd of each damper. This is because the temperature of the combustion chamber 20 can be directly controlled by the burner 21, but the temperature of the heat storage chambers 22 a and 22 b does not rise or fall unless VOC flows through the combustion ducts 23 and 24.

  Accordingly, the dampers are also controlled so that an air passage from the exhaust duct 40 through the blower fan 18 to the combustion furnace 14 and the air discharge port 38 is secured. Specifically, the dampers 30, 32, 33a, 33b, 34a, 34b are opened, and the dampers 31, 35 are closed. Further, the degree of opening and closing may be controlled. Further, the main blower fan 18 is controlled so that the pressure in the suction duct 40 becomes a predetermined pressure.

  When the deodorizing apparatus 1 is in steady operation, each part is set as described above, and the VOC from the VOC generation source 70 passes through the exhaust duct 40, the damper 30, the damper 32, the main blower fan 18, and the duct 44. To the combustion furnace 14. The VOC branches to dampers 34 a and 33 a before the combustion furnace 14 and is supplied to the combustion furnace 14.

  The VOC passing through the combustion duct 24 is heated in the heat storage chamber 22a, and further heated in the combustion chamber 20 to be decomposed into harmless carbon, hydrogen, and oxygen. And the gas after a process heats the thermal storage chamber 22b, and is discharged | emitted from the damper 33b. Similarly, the VOC passing through the combustion duct 23 is heated in the heat storage chamber 22b and decomposed in the combustion chamber 20, and then the temperature of the heat storage chamber 22a is raised and discharged from the damper 34b. These treated gases pass through the duct 45 and are discharged from the atmospheric discharge port 38.

  Next, a process when both the static pressure regulators 12 of the duplicated blower fans have failed will be described. The static pressure regulator 12 has two identical static pressure regulators, and notifies the control device 10 of the static pressure in the exhaust duct 40 with a static pressure signal Sp. The control device 10 receives these signals and controls the main blower fan 18 and each damper.

  Moreover, the static pressure regulator 12 has a self-diagnosis function. If the self-diagnosis function determines that an abnormality has occurred in its own static pressure measurement, it notifies the control device 10 of its own failure with the failure signal Ss. The abnormality of the static pressure adjuster 12 means a case where accurate static pressure cannot be output due to a failure of a circuit of the static pressure sensor.

  The deodorization apparatus 1 is scheduled to have a VOC processing amount per unit time from the VOC generation source 70. Since the processing amount is detected by the amount of gas passing through the exhaust duct 40, the deviation of the static pressure signal from the static pressure regulator 12 affects the processing amount of the entire deodorizing apparatus 1. Therefore, the control device 10 ignores the static pressure signal Sp representing the static pressure from the static pressure regulator 12 from which the failure signal Ss has been transmitted, and uses the remaining static pressure signal Sp from the static pressure regulator 12 to blow the fan. And control each damper.

  Here, the remaining static pressure regulator may also determine that its own static pressure measurement is abnormal by the self-diagnosis function, and notify the control device 10 of the failure with the signal Ss. As described above, when the value of the static pressure of the exhaust duct 40 is not accurate, the air is not properly blown. Therefore, when the main blower fan 18 is operating, the combustion furnace 14 cannot be normally operated. In addition to not being able to exhibit the deodorizing function, the combustion furnace 14 may be damaged. Further, when the auxiliary blower fan 16 is in operation, the VOC is not sufficiently discharged outdoors, and the VOC stays indoors, which is a problem in terms of health and safety.

  Therefore, if any of the duplicated static pressure regulators 12 fails, the VOC is properly processed by controlling the control device 10 to perform a fixed operation independent of the static pressure regulator 12. The operation of the manufacturing apparatus 10 is continued.

Specific examples of the fixed operation are as follows. The first method is a method of operating the main blower fan 18 and the spare blower fan 16 at fixed frequencies assigned to each. Here, the blower fan will be described as being inverter-controlled. In this method, the control device 10
In this memory, the operating frequencies of the main blower fan 18 and the spare blower fan 16 when both the static pressure regulators 12 have failed are recorded in advance, and each blower fan is operated at that frequency. Specifically, both the main blower fan 18 and the preliminary blower fan 16 are operated at an output of 60 to 80% of the maximum output. Note that the outputs of the main blower fan 18 and the preliminary blower fan 16 may be different.

  In this case, all the dampers other than the damper 35 for taking in outside air are opened for operation. This is to ensure exhaust from the work environment.

  The second method is a method of operating the blower fan that was operating immediately before both of the static pressure regulators 12 have failed at a fixed frequency. In this case, since it is not necessary to change opening and closing of the duct, the processing of the control device 10 is easy.

  As a third method, the operation state immediately before both of the static pressure regulators 12 fail is maintained as it is. In this method, the processing of the control device 10 is easier. There is no change in opening and closing of the duct.

  Next, these processes will be described using a flow. FIG. 2 shows an example of the processing flow of the deodorizing apparatus 1. When the control device 10 starts (S100), pre-processing is performed (S102). The pretreatment is a so-called start-up process of the deodorizing apparatus 1 itself, and includes all processes up to the steady operation described above.

  Next, the static pressure is read (S104). This is performed by acquiring a static pressure signal Sp from the static pressure adjuster 12. If neither of the two static pressure adjusters 12 is abnormal, only one signal may be acquired or both may be acquired.

  Then, it is determined whether or not there is a failure signal Ss that informs the signal from the static pressure regulator 12 (S106). If there is a failure signal Ss in one of the static pressure regulators 12 (Y branch of S106), it is next determined whether or not the failure signal is the second time (S108). When the failure signal Ss is the second time, since both of the two static pressure regulators 12 have failed, the processing is shifted to failure processing (S116).

  If it is not the second failure signal, or if there is no failure signal in the first place, a control process (S110) is performed. “Control processing” includes all processing performed by the control device 10 during steady operation. In particular, in addition to the operation of the combustion furnace 14 and the blower fan, when the failure signal Ss is received only once, the signal from the static pressure regulator 12 that issued the failure signal is ignored, and only the other static pressure signal Sp is received. Including the process of adopting. Further, the malfunctioning static pressure regulator 12 may be notified or displayed to the outside.

  In the control process (S110), various parameters are updated so that the temperature of the combustion furnace 14 and the output to the blower fan become predetermined values. Thereafter, an end determination is made (S112). The end determination may be activated by whether or not an instruction to stop the entire apparatus has been issued, or by another interrupt process.

  When the apparatus is to be terminated (Y branch of S112), a stop process (S114) is performed. Since the deodorizing apparatus 1 burns fuel with a large-scale burner 21, a certain procedure is required to stop the operation so that the apparatus is not burdened. If there is no end instruction (N branch of S114), the flow returns to the static pressure reading (S104) again.

In this description, the process of confirming the presence or absence of a failure signal in the main routine has been described. However, the presence or absence of a failure signal can be determined by interrupting the main routine from the main routine to the failure process flow. Good.

  FIG. 3 shows a flow of failure processing by the first method. When the flow proceeds to the failure processing flow (S200), a damper is set (S202). Specifically, referring to FIG. 1, dampers 30, 31, 32, 33 (both a and b) and 34 (both a and b) are opened. The damper 35 may be closed.

  Next, an operation instruction with a fixed frequency is given to the main blower fan 18 and the preliminary blower fan 16 with the drive signals Cdm and Cds. The operation instruction at the fixed frequency may be an instruction to indicate the fixed frequency itself, or the fan fans 16 and 18 have a preset value and are instructed to operate at the frequency. May be.

  Then, an indication that the blower fans 16 and 18 are fixed is displayed (S206). This display is not particularly limited, such as a lamp, a warning sound, and a screen display. All of these are used as display means.

  Next, the control device 10 enters a standby state (S208). It is because it became a fixed operation state. The standby state (S208) may be replaced with a flow for detecting whether or not the blower fans 16 and 18 are operated at a determined frequency and controlling the frequency.

  FIG. 4 shows a flow of failure processing by the second method. When the control shifts to the failure process (S210), the operating fan is detected (S212). You may know by obtaining the status from a ventilation fan, and you may judge from the record of the ventilation fan which instruct | indicated driving | operation last. Next, a fixed frequency is instruct | indicated with respect to the fan currently operated. Since the air blowing fan in operation is used, it is not necessary to switch the other air blowing fan or the duct serving as the air passage with the damper. And a fixed driving | operation display is performed and it transfers to a standby state.

  FIG. 5 shows a flow of failure processing by the third method. Since this method only maintains the current operating state, when control shifts to failure processing (S220), a fixed operation display is performed (S222), and a standby state is entered (S224). Here, the standby state may be replaced with a process for maintaining the current operating frequency of the blower fan as described above.

  In the above description, the “fixed frequency” may be a frequency determined in advance at the time of design, or may be an average of driving frequencies within a fixed time. Moreover, although the thermal storage-type combustion furnace 14 was demonstrated as a deodorizing means, you may use other deodorizing apparatuses, such as a direct combustion apparatus, a catalytic combustion apparatus, an activated carbon adsorption apparatus, and a gas-liquid contact apparatus.

  As described above, the present invention generates a VOC because each blower fan is fixedly operated even if the static pressure regulator of the blower fan to the blower passage to the combustion furnace and the blower passage to the atmospheric discharge breaks down. The VOC can be automatically deodorized or exhausted without stopping the manufacturing apparatus.

  The present invention can also be suitably used for VOC treatment in a coating process and a cleaning process in which an organic solvent is continuously used.

It is a figure which shows the structure of the deodorizing apparatus of this invention. It is a figure which shows the processing flow of the control apparatus which drives the deodorizing apparatus of this invention. It is a figure which shows an example of the flow of a process when the double static pressure regulator of the deodorizing apparatus of this invention has both made abnormality. It is a figure which shows an example of the flow of a process when the double static pressure regulator of the deodorizing apparatus of this invention has both made abnormality. It is a figure which shows an example of the flow of a process when the double static pressure regulator of the deodorizing apparatus of this invention has both made abnormality.

DESCRIPTION OF SYMBOLS 1 Deodorizing device 10 Control device 12 Static pressure regulator 14 Combustion furnace (deodorizing means)
DESCRIPTION OF SYMBOLS 20 Combustion chamber 21 Burner 22a, 22b Thermal storage chamber 23, 24 Combustion duct 30-35 Damper 36 Outside air intake 37, 38 Atmospheric discharge port 40-45 Duct 70 VOC generation source

Claims (6)

An exhaust duct for exhausting gas containing volatile compounds;
A doubled static pressure regulator provided in the exhaust duct and outputting a static pressure information of the exhaust duct and a self-diagnosis function;
A blower fan provided downstream of the static pressure regulator;
Deodorizing means connected to the blower fan;
A deodorizing apparatus having a control device for controlling the blower fan to perform a fixed operation when the abnormal signal is received. The blower fan has a main blower fan that sends the volatile compound-containing gas from the exhaust duct to the deodorizing means, and a preliminary blower fan that discharges the volatile compound-containing gas into the atmosphere from the exhaust duct,
The deodorizing apparatus according to claim 1, wherein the control device controls both the main blower fan and the preliminary blower fan to operate at a fixed output. The blower fan has a main blower fan that sends the volatile compound-containing gas from the exhaust duct to the deodorizing means, and a preliminary blower fan that discharges the volatile compound-containing gas into the atmosphere from the exhaust duct,
The control device detects one of the main blower fan and the spare blower fan that was operating when the abnormal signal is received, and operates the detected blower fan at a fixed output. The deodorizing apparatus according to claim 1, wherein the deodorizing apparatus is controlled. The blower fan has a main blower fan that sends the volatile compound-containing gas from the exhaust duct to the deodorizing means, and a preliminary blower fan that discharges the volatile compound-containing gas from the exhaust duct into the atmosphere,
The deodorizing apparatus according to claim 1, wherein the control device performs control so as to maintain an operation state of a blower fan that is being operated when the abnormal signal is received. 5. The deodorizing apparatus according to claim 2, wherein the fixed output is a weighted average of control parameters based on an operation history of the blower fan over a fixed time. A deodorizing apparatus operating method in which a main air blowing fan, deodorizing means connected to the main air blowing fan, and a preliminary air blowing fan connected to an air discharge port are operated by a control device based on static pressure by a static pressure regulator. And
Receiving a failure signal of the static pressure regulator;
A safe operation method for a deodorizing apparatus, comprising a step of fixing the main blower fan and the preliminary blower fan.

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