Filtration system regeneration system

Abstract

To provide a filtration device regeneration system capable of efficiently treating organic materials and the like desorbed from a filter medium when regenerating an adsorption filter medium.SOLUTION: A filtration device regeneration system 1 comprises: a regeneration gas supply line 20 to supply a regeneration gas to a filtration device 10 to remove organic materials from a gas or liquid by a filter medium; a regenerated exhaust gas line 30 to exhaust a regenerated exhaust gas from the filtration device; a catalytic combustion device 60 to combust the organic materials contained in the regenerated exhaust gas by contacting a preheated mixed gas where combustion air is mixed to the regenerated exhaust gas exhausted from the regenerated exhaust gas line with a catalyst; an air supply line 70 to supply the combustion air to the catalytic combustion device; and a control device 80 to adjust at least any one of a flow rate of the regeneration gas in the regeneration gas supply line and a flow rate of the regeneration gas in the air supply line so that a combustion temperature of the mixed gas at the catalyst is kept in a prescribed range.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a filtration device regeneration system.

Background Art

[0002] Filtering devices (adsorption towers) using activated carbon, alumina, zeolite, etc. as adsorption filter materials are used to remove organic substances in gases and liquids. When using these filtering devices, in order to regenerate the adsorption filter material by desorbing the adsorbed organic substances, a regeneration gas such as water vapor, air, nitrogen, or various waste gases having a temperature above the boiling point of the organic substances is passed through the filtering device to the filter material whose filtering ability has decreased due to adsorption of organic substances. A technique has been proposed (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] When adsorption filter media are regenerated using regeneration gas, regeneration exhaust gas containing organic matter is discharged. Releasing or disposing of such regeneration exhaust gas directly into the atmosphere is undesirable from the standpoint of causing air pollution and health hazards. It is also possible to condense the regeneration exhaust gas containing organic matter and treat it as a waste liquid, but such waste liquid treatment is often costly and can lead to water pollution. Direct combustion methods, which oxidize and decompose organic matter in the regeneration exhaust gas by supplying it to an incinerator, are also widely used. However, direct combustion methods require maintaining a decomposition temperature of 800°C or higher, and since regeneration exhaust gas is at around 100-500°C, co-firing with other fuels is necessary to raise the temperature of the regeneration exhaust gas to the combustion decomposition temperature of organic matter and to continue stable combustion decomposition, which increases energy costs. In particular, when water vapor is used as the regeneration gas for adsorption filter media, the energy cost for raising the temperature of the regeneration exhaust gas is even higher due to its high specific heat.

[0005] Furthermore, catalytic combustion methods are known that use precious metal catalysts to oxidize and decompose organic matter at relatively low temperatures of around 200-400°C. In catalytic combustion, organic matter can be burned at lower temperatures compared to direct combustion, thus reducing the energy cost required to raise the temperature of the regenerated exhaust gas. However, if the combustion temperature generated by the burning of organic matter becomes too high, sintering occurs, causing the catalyst itself to degrade due to heat, making it impossible to continue stable oxidative decomposition. In particular, when the main component of the gas used for catalytic combustion is water vapor, it is known that the temperature at which sintering occurs in the catalyst is low. Therefore, when water vapor is used as the regeneration gas for adsorption filter media, it becomes even more difficult to apply catalytic combustion to the decomposition treatment of the regenerated exhaust gas.

[0006] Therefore, the present invention aims to provide a filtration system regeneration system that can efficiently process organic matter and the like that detached from the filter material when the adsorption filter material is regenerated. [Means for solving the problem]

[0007] A filtration device regeneration system according to one aspect of the present invention comprises: a regeneration gas supply line that supplies regeneration gas to a filtration device that removes organic matter from a gas or liquid using a filter material; a regeneration exhaust gas line that discharges regeneration exhaust gas from the filtration device; a catalytic combustion device that burns organic matter contained in the regeneration exhaust gas by preheating a mixed gas, which is obtained by mixing combustion air with the regeneration exhaust gas discharged from the regeneration exhaust gas line, and bringing it into contact with a catalyst; an air supply line that supplies combustion air to the catalytic combustion device; and a control device that adjusts at least one of the flow rate of regeneration gas in the regeneration gas supply line and the flow rate of regeneration gas in the air supply line so as to maintain the combustion temperature of the mixed gas in the catalyst within a predetermined range.

[0008] In the filtration device regeneration system described above, the regeneration gas supply line may have a regeneration gas flow rate adjustment unit that adjusts the flow rate of the supplied regeneration gas, and the control device may have a gas flow rate control unit that controls the regeneration gas flow rate adjustment unit to reduce the flow rate of the regeneration gas when it is determined that the combustion temperature of the mixed gas in the catalyst exceeds a predetermined gas limit temperature.

[0009] In the filtration device regeneration system described above, the control device may further include an initial control unit that controls the regeneration gas flow rate adjustment unit to temporarily reduce the flow rate of the regeneration gas when the preheating of the filtration device is complete, and then gradually increase the flow rate of the regeneration gas.

[0010] In the filtration device regeneration system described above, the regeneration gas flow rate adjustment unit may include a plurality of flow paths arranged in parallel, each having an on / off valve.

[0011] In the above-described filtration device regeneration system, the air supply line or the catalytic combustion device may have an air flow rate adjustment unit that adjusts the flow rate of combustion air, and the control device may have an air flow rate control unit that controls the air flow rate adjustment unit to reduce the flow rate of combustion air when it is determined that the combustion temperature of the mixed gas in the catalyst falls below a predetermined air limit temperature.

[0012] In the above-described filtration device regeneration system, the filter material may be activated carbon.

[0013] In the above-described filtration device regeneration system, the regeneration gas may be water vapor.

[0014] In the filtration device regeneration system described above, the regeneration exhaust gas line has a discharge valve for discharging the condensate of the regeneration exhaust gas flowing out of the filtration device, and the control device may further have a preheating control unit that controls the discharge valve to discharge the regeneration exhaust gas or condensate from the filtration device until the temperature of the regeneration exhaust gas or condensate reaches its saturation temperature.

[0015] A filtration device regeneration system according to another aspect of the present invention comprises: a regeneration gas supply line that supplies regeneration gas to a filtration device that removes organic matter from a gas or liquid using a filter material; a regeneration exhaust gas line that discharges regeneration exhaust gas from the filtration device; a catalytic combustion device that preheats the regeneration exhaust gas discharged from the regeneration exhaust gas line and brings it into contact with a catalyst to burn organic matter contained in the regeneration exhaust gas; and a control device that adjusts the flow rate of regeneration gas in the regeneration gas supply line so as to maintain the combustion temperature of the regeneration exhaust gas in the catalyst within a predetermined range. [Effects of the Invention]

[0016] According to the present invention, a filtration system regeneration system can be provided that can efficiently process organic matter and the like that detached from the filter material when the adsorption filter material is regenerated. [Brief explanation of the drawing]

[0017] [Figure 1] This figure shows the configuration of a filtration device regeneration system according to one embodiment of the present invention. [Figure 2] This graph shows the changes in the measured values ​​of the inlet and outlet temperatures of the catalytic combustion section in Example 1 of the present invention. [Figure 3] This graph shows the change in the amount of water vapor supplied to the filtration device in Example 1 of the present invention. [Figure 4]It is a graph showing the change in the opening degree of the air flow rate adjustment valve in Example 1 of the present invention. [Figure 5] It is a graph showing the change in the treatment amount of exhaust steam and the power consumption by the catalytic combustion device in Example 1 of the present invention. [Figure 6] It is a graph showing the change in the temperature of each part of the activated carbon filtration tower in Example 1 of the present invention. [Figure 7] It is a graph showing the change in the organic matter content before and after the catalytic combustion device in Example 1 of the present invention. [Figure 8] It is a graph showing the change in the measured values of the inlet temperature and outlet temperature of the catalytic combustion part in Example 2 of the present invention. [Figure 9] It is a graph showing the change in the amount of water vapor supplied to the filtration device in Example 2 of the present invention. [Figure 10] It is a graph showing the change in the treatment amount of exhaust steam and the power consumption by the catalytic combustion device in Example 2 of the present invention. [Figure 11] It is a graph showing the change in the temperature of each part of the activated carbon filtration tower in Example 2 of the present invention. [Figure 12] It is a graph showing the change in the organic matter content before and after the catalytic combustion device in Example 2 of the present invention. [Figure 13] It is a graph showing the change in the measured values of the inlet temperature and outlet temperature of the catalytic combustion part in Comparative Example 1 of the present invention.

Mode for Carrying Out the Invention

[0018] Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing the configuration of a filtration device regeneration system 1 according to an embodiment of the present invention.

[0019] The filtration device regeneration system 1 regenerates the filter material 11 of the filtration device 10, which removes organic matter from gases or liquids using the filter material 11. The filtration device regeneration system 1 includes a regeneration gas supply line 20 that supplies regeneration gas to the filtration device, a regeneration exhaust gas line 30 that discharges regeneration exhaust gas from the filtration device 10, a recirculation line 40 that recirculates a portion of the regeneration exhaust gas discharged from the filtration device 10 to the regeneration gas supply line 30 back to the regeneration gas supply line 20, a blow-off line 50 that discharges the regeneration exhaust gas or its condensate discharged to the regeneration exhaust gas line 30 to the outside of the system, a catalytic combustion device 60 that burns organic matter contained in the regeneration exhaust gas by preheating a mixed gas, which is obtained by mixing combustion air with the regeneration exhaust gas discharged from the regeneration exhaust gas line 30, and bringing it into contact with a catalyst, an air supply line 70 that supplies combustion air to the catalytic combustion device 60, and a control device 80 that controls other components. Although not shown in the figures, the filtration device 10 may also have lines for supplying and discharging gas or liquid containing organic matter, and an outlet for replacing the filter media 11.

[0020] The filter media 11 housed in the filtration device 10 can be, for example, activated carbon, alumina, or zeolite, with activated carbon being typically used due to its low cost and excellent adsorption performance of organic matter. When activated carbon is used as the filter media 11, the economic efficiency of the entire cycle from organic matter removal to regeneration is significantly improved. The organic matter removed in the filtration device 10 is expected to include various organic solvents, factory wastewater components, dyes, surfactants, and VOC components.

[0021] The regeneration gas supply line 20 supplies regeneration gas at a temperature higher than the boiling point of organic matter adsorbed on the filter media 11 to the filtration device 10. The regeneration gas supply line 20 in this embodiment may be configured to include a regeneration gas flow rate adjustment unit 21 for adjusting the flow rate of the supplied regeneration gas, an ejector 22 for introducing regenerated exhaust gas recirculating from the recirculation line 40 into the regeneration gas, and a heater 23 for heating the regeneration gas. In addition, the regeneration gas supply line 20 may have a flow sensor, a temperature sensor, etc., as needed, although it is not shown in the figures.

[0022] The regeneration gas supplied from the regeneration gas supply line 20 can be, for example, steam, air, nitrogen, or high-temperature exhaust gas discharged from nearby facilities. Among these, steam is particularly suitable because it has a relatively large heat capacity, is easy to handle, and its latent heat can be utilized when heating. Furthermore, since steam is a relatively inert gas, there is little risk of damaging the filter material 11 or generating toxic products such as carbon monoxide by reacting with desorbed organic matter. If the temperature of the regeneration gas supplied from the source is insufficient, the regeneration gas supply line 20 heats the regeneration gas with a heater 23 before introducing it to the filtration device 10. In addition, when using steam as the regeneration gas, the saturated steam supplied from a boiler or the like is superheated by the heater 23, so that the filtration device 10 is not required to withstand excessive pressure.

[0023] The regeneration gas flow rate adjustment unit 21 may be composed of a single control valve that adjusts the flow rate by adjusting the opening degree, but in this embodiment, it is configured to have a plurality of restricting passages 211 arranged in parallel, each allowing regeneration gas to pass through at a preset flow rate. Each restricting passage 211 may be configured to have an on-off valve 212 that opens and closes the passage. The restricting passages 211 may be configured to set the flow rate according to the size of the piping and the on-off valve 212, and may have restricting members such as the throttle valve 213 or orifice shown in the figure. The amount of regeneration gas supplied can be adjusted by the combination of restricting passages 211. In particular, if the flow rate of at least some of the regeneration gas in the restricting passages 211 differs from that of others, a variety of flow rates can be selected by combining them. Furthermore, because the regeneration gas flow rate adjustment unit 21 is configured to set the flow rate in stages by the combination of restricting passages 211, the flow rate can be changed quickly, thereby suppressing overshoot of the combustion temperature in the catalytic combustion device 60 and reliably suppressing thermal degradation of the catalyst.

[0024] The regenerative exhaust gas line 30 guides the regenerative exhaust gas discharged from the filtration device 10 to the catalytic combustion device 60. In particular, when water vapor is used as the regenerative gas, it is preferable that the regenerative exhaust gas line 30 has a temperature sensor 31 to determine whether or not the regenerative exhaust gas contains condensed water. If the temperature of the regenerative exhaust gas is below the saturation temperature, it is considered that condensed water may have formed inside the filtration device 10, and the regenerative exhaust gas may contain condensed water. Furthermore, the regenerative exhaust gas line 30 may be configured to have an introduction valve 32 that shuts off the introduction of regenerative exhaust gas to the catalytic combustion device 60.

[0025] The recirculation line 40 recirculates a portion of the regenerated exhaust gas discharged from the filtration device 10 to the regenerated gas supply line 20. This allows for the recovery of some of the thermal energy of the regenerated exhaust gas and enables the reuse of the regenerated gas, thereby reducing the energy costs required for the regeneration of the filtration device 10 and the costs of supplying the regenerated gas. The recirculation line 40 may be configured to include a check valve 41 and a recirculation valve 42 that blocks the recirculation of regenerated exhaust gas to the regenerated gas supply line 20.

[0026] The blow-off line 50 is used to release condensate from the system to prevent it from being introduced into the catalytic combustion unit 60 when the regenerated exhaust gas flowing out from the filtration unit 10 contains condensate. The blow-off line 50 may be configured to have a discharge valve 51 that shuts off the regenerated exhaust gas. If condensate is introduced into the catalytic combustion unit 60, there is a risk of operational problems such as burning, scaling, and bumping of inorganic substances contained in the condensate, but these problems can be prevented by releasing the condensate from the system through the blow-off line 50.

[0027] The catalytic combustion device 60 may be configured to include a mixing unit 61 that mixes combustion air with regenerated exhaust gas, a preheating unit 62 that preheats the mixed gas obtained by mixing regenerated exhaust gas and combustion air to a certain temperature, a catalytic combustion unit 63 that burns organic matter by bringing the preheated mixed gas into contact with a catalyst, a heat exchange unit 64 that exchanges heat between the combustion exhaust gas obtained by burning the mixed gas and the combustion air, a cooling unit 65 that lowers the temperature by mixing outside air with the combustion exhaust gas, and an exhaust fan 66 that sucks in the combustion exhaust gas mixed with outside air from the cooling unit 65 and discharges it to the outside.

[0028] In the mixing section 61, combustion air is mixed with the regenerated exhaust gas to provide the oxygen necessary to burn the organic matter in the regenerated exhaust gas. The combustion air plays the role of supplying the oxygen necessary for combustion, and at the same time acts as diluting air to suppress the temperature of the combustion exhaust gas by adjusting the concentration of organic matter in the mixed gas. In the preheating section 62, the mixed gas is heated to a temperature at which it can be burned in the catalytic combustion section 63. In the catalytic combustion section 63, the organic matter in the mixed gas is burned by the action of a catalyst. For example, platinum, palladium, etc., can be used as the catalyst. A combustion temperature sensor 67 is provided inside or at the outlet of the catalytic combustion section 63 to measure the temperature of the combustion exhaust gas immediately after combustion as the combustion temperature. In the heat exchange section 64, heat exchange is performed between the combustion air before it is introduced into the preheating section 62 and the combustion exhaust gas, reducing the load on the preheating section 62. In the cooling section 65, the temperature of the combustion exhaust gas is lowered to below the heat resistance temperature of the exhaust fan 66 by diluting the combustion exhaust gas with outside air.

[0029] The air supply line 70 preferably has an air flow rate adjustment unit 71 that adjusts the flow rate of combustion air supplied to the catalytic combustion device 60. The air flow rate adjustment unit 71 can be formed by a flow rate adjustment valve as shown in the figure, or it may be a fan speed adjustment mechanism (not shown) that supplies combustion air.

[0030] The control device 80 adjusts the flow rate of at least one of the regenerating gas and combustion air to maintain the combustion temperature of the mixed gas in the catalytic combustion section 63 within a predetermined range. The control device 80 in this embodiment includes a preheating control unit 81, an initial control unit 82, a gas flow rate control unit 83, and an air flow rate control unit 84. The control device 80 may be configured as a computer device that executes an appropriate program and is equipped with a processor, memory, input / output interface, etc., to enable general control such as on-off control, proportional control, feedback control, and feedforward control. Alternatively, the control device 80 may be configured as a physical circuit without using software. The preheating control unit 81, initial control unit 82, gas flow rate control unit 83, and air flow rate control unit 84 are classifications of the functions of the control device 80 and do not necessarily have to be clearly distinguishable in terms of physical configuration and program configuration.

[0031] The preheating control unit 81 controls the discharge valve 51 to discharge the regenerated exhaust gas or condensate from the filtration device 10 to the outside of the system until the temperature of the regenerated exhaust gas or condensate flowing out of the filtration device 10 reaches its saturation temperature. This prevents inorganic matter from burning, scaling, and bumping that may occur in the preheating section 62 when the condensate is introduced into the catalytic combustion device.

[0032] The initial control unit 82 controls the regeneration gas flow rate adjustment unit 21 to temporarily reduce the flow rate of the regeneration gas when the preheating of the filtration device 10 is complete, and then gradually increase the flow rate of the regeneration gas. When the filtration device 10 adsorbs a large amount of low-boiling-point organic matter, when preheating is complete, especially when the temperature of the regenerated exhaust gas detected by the temperature sensor 31 reaches the saturation temperature, the amount of heat generated by the catalytic combustion of the regenerated exhaust gas increases due to the large amount of low-boiling-point organic matter in the regenerated exhaust gas, which can easily cause sintering of the catalyst. For this reason, the initial control unit 82 reduces the flow rate of the regeneration gas when starting regeneration, thereby reducing the amount of organic matter introduced into the mixed gas immediately after the start of operation and preventing the combustion temperature in the catalytic combustion unit 63 from becoming too high.

[0033] The gas flow control unit 83 controls the regeneration gas flow rate adjustment unit 21 to reduce the flow rate of regeneration gas when it is determined that the combustion temperature of the mixed gas in the catalyst in the catalyst combustion unit 63 exceeds a predetermined gas limit temperature. By reducing the flow rate of regeneration gas when the temperature of the combustion exhaust gas in the catalyst combustion unit 63 is too high, the amount of organic matter removed from the filter material 11 is reduced, thereby suppressing the amount of heat generated, which in turn suppresses the rise in combustion temperature and prevents catalyst sintering.

[0034] The air flow control unit 84 controls the air flow rate adjustment unit to reduce the flow rate of combustion air when it determines that the combustion temperature of the mixed gas in the catalyst in the catalytic combustion unit 63 falls below a predetermined air limit temperature. A low temperature of the combustion exhaust gas in the catalytic combustion unit 63, that is, a low temperature rise due to the combustion of the mixed gas, means that the amount of organic matter contained in the regenerated exhaust gas is small, and less air is needed to supply the oxygen necessary for combustion and to absorb heat to prevent sintering. Therefore, by reducing the flow rate of combustion air in accordance with the decrease in the temperature of the combustion exhaust gas, the energy required to preheat the mixed gas in the preheating unit 62 can be saved. The air limit temperature is set to a temperature below the gas limit temperature, preferably with a certain difference, so that the gas flow control unit 83 and the air flow control unit 84 do not interfere with each other.

[0035] The filtration device regeneration system 1, having the configuration described above, supplies a regeneration gas at a temperature higher than the boiling point of organic matter adsorbed on the filter media 11 to the filtration device 10 from the regeneration gas supply line 20. The regenerated exhaust gas, containing the volatilized organic matter and the regeneration gas, is introduced into the catalytic combustion device 60 and mixed with the combustion stalks to decompose the organic matter in the regenerated exhaust gas by catalytic combustion. By adjusting the flow rate of at least one of the regeneration gas and combustion air, the filtration device regeneration system 1 can adjust the amount of organic matter removed from the filter media or the flow rate of combustion air that absorbs the heat generated by combustion, and maintain the combustion temperature within a predetermined range, thereby preventing catalyst sintering and achieving high energy efficiency.

[0036] Although various embodiments of the present invention have been described above, the present invention is not limited to the embodiments described above, and various modifications and variations are possible. For example, the filtration device regeneration system according to the present invention may control the combustion temperature by adjusting only the flow rate of either the regeneration gas or the combustion air. For this reason, if the regeneration gas is a gas containing sufficient oxygen, such as air, the filtration device regeneration system according to the present invention may not have an air supply line for supplying combustion air to the catalytic combustion device and a configuration for controlling the air supply line. Also, although Figure 1 shows that combustion air and cooling air are taken into the catalytic combustion device 60 by the suction force of the exhaust fan 66, as another example, combustion air and cooling air may be supplied to the catalytic combustion device by a compressor, blower, or the like.

[0037] Furthermore, since the temperature range required for catalytic combustion varies depending on the type of organic matter contained in the regenerated exhaust gas (generally in the range of 200 to 400°C), the preheating temperature in the preheating section 62, as well as the gas limiting temperature and air limiting temperature (i.e., the combustion temperature detected by the combustion temperature sensor 67), may be temporarily or gradually increased or decreased during the processing of the regenerated exhaust gas. By controlling the combustion temperature according to the combustibility of the organic matter contained in the regenerated exhaust gas, more economical and stable combustion processing can be performed, or unburned organic matter adsorbed on the catalyst can be burned (referred to as catalyst reset processing, flushing processing, etc.).

[0038] Furthermore, the filtration device regeneration system according to the present invention may be provided with an air flow rate adjustment unit for adjusting the flow rate of combustion air inside the catalytic combustion device, for example, between the heat exchange unit and the mixing unit. Examples of air flow rate adjustment units provided in the catalytic combustion device include an exhaust fan rotation speed adjustment mechanism and an exhaust fan airflow adjustment damper.

[0039] Furthermore, in the filtration device regeneration system according to the present invention, the reflux line and blow line are not essential components. [Examples]

[0040] The present invention will be described in detail below based on examples, but the present invention is not limited to the following examples.

[0041] A filtration system regeneration system with the configuration shown in Figure 1 was constructed, and its performance was evaluated through testing. The filtration system used was the "WC-80AJ" activated carbon filtration tower from Miura Industries, Ltd., and the catalytic combustion system used was the "DEOCAT-2" catalytic combustion system from Tabata Machinery Industry Co., Ltd. The regeneration gas flow rate control section had four flow paths adjusted to steam flow rates of 4 kg / hr, 2 kg / hr, 4 kg / hr, and 5 kg / hr, respectively. The system was configured to allow selection of flow rates of 4 kg / hr, 6 kg / hr, 8 kg / hr, 10 kg / hr, or 15 kg / hr depending on the combination of flow paths. Using this filtration system regeneration system, simulated wastewater was prepared by dissolving 1000 mg each of 1-butanol (boiling point 118°C) and benzoic acid (boiling point 249°C) per liter of tap water. This simulated wastewater was then passed through the activated carbon filtration tower for 1 hour at a space velocity of 10 BV / hr. The system was then regenerated using steam as the regeneration gas.

[0042] (Example 1) In Example 1, the filtration system was regenerated with the control of the preheating control unit, initial control unit, gas flow control unit, and air flow control unit enabled. During the test, in order to check the condition of the activated carbon filtration tower, the water vapor (regeneration gas) temperature at the heater outlet (activated carbon filtration tower inlet), the temperature inside the upper layer (regeneration gas inlet side), outside the upper layer, inside the middle layer, outside the middle layer, inside the lower layer, and outside the lower layer within the activated carbon filtration tower, and the water vapor temperature at the inlet and outlet of the activated carbon filtration tower were measured. In addition, in order to check the decomposition of organic matter in the catalytic combustion unit, regeneration waste steam (regeneration exhaust gas) was periodically sampled from the inlet of the catalytic combustion unit, and combustion exhaust gas was periodically sampled from the inlet of the catalytic combustion unit, and these were condensed (drained) to measure TOC (total organic carbon).

[0043] The operation of the filtration system regeneration system consisted of four periods: Period I, controlled by the preheating control unit; Period II, until the operation was stabilized by the initial control unit, gas flow control unit, and air flow control unit; Period III, mainly to confirm the combustion of 1-butanol; Period IV, mainly to confirm the combustion of benzoic acid; and Period V, in which the preheater of the catalytic combustion device was stopped to prepare for shutdown. During the combustion treatment of the regenerated exhaust gas by the catalytic combustion device, the catalyst temperature was temporarily increased for 15 minutes every two hours (set to 450°C in Period III and 500°C in Period IV) to flush the catalyst. This process was performed twice. Period III covered the period up to the second flush, and Period IV covered the period after the completion of the second flush. The preheater temperature of the catalytic combustion device (catalytic combustion inlet temperature setting) was set to 300°C in Period III and 400°C in Period IV.

[0044] The gas flow control unit sets the gas limit temperature to 500°C and the initial steam flow rate at the start of control to 4 kg / hr, increasing the steam flow rate while monitoring the combustion temperature (catalyst outlet temperature) of the mixed gas. The air flow control unit sets the air limit temperature as the upper limit and linearly changes the opening of the air flow control valve from 100% to 40% (lower limit) down to a temperature 50°C below the air limit temperature, with the air limit temperature set to 425°C in period III and 475°C in period IV.

[0045] Figure 2 shows the changes in measured values ​​of the inlet and outlet temperatures of the catalytic combustion section in the catalytic combustion device. Figure 3 shows the change in the amount of water vapor supplied to the filtration device, and Figure 4 shows the change in the opening degree of the air flow control valve. From these graphs, it can be seen that, in particular during period II, the initial control unit and the gas flow control unit prevented an excessive rise in catalyst temperature, and during periods III and IV, the air flow control unit prevented an excessive decrease in catalyst temperature.

[0046] Figure 5 shows the measured records of the cumulative exhaust steam (regenerated exhaust gas) processing volume and cumulative power consumption (electrical energy) in the catalytic combustion system. In periods III and IV, the exhaust steam volume (= slope of the cumulative processed exhaust steam volume graph) remained constant, while the power consumption (= slope of the cumulative power consumption graph) increased slightly in period IV compared to period III.

[0047] Figure 6 shows the temperature changes in each part of the activated carbon filtration tower. From Figure 6, it can be interpreted that the temperature of the filter media inside the activated carbon filtration tower rose sequentially, and ultimately the organic matter adsorbed on the filter media was evaporated and removed.

[0048] Figure 7 shows the changes in organic matter content before and after the catalytic combustion device (exhaust steam and combustion exhaust gas). According to Figure 7, the amount of organic matter in the exhaust steam reaches its highest value immediately after the start of regeneration treatment and gradually decreases. Furthermore, the amount of organic matter in the exhaust steam increases in period IV as the steam temperature introduced into the activated carbon filtration tower shown in Figure 6 rises (this temperature rise is due to the entire filtration bed reaching over 100°C, and the steam temperature partially circulated by the ejector also reaching over 100°C), and as the high-temperature zone of the filtration bed expands. Given the way the filtration bed temperature rises shown in Figure 6 and the fact that the components of the simulated wastewater passed through the activated carbon are 1-butanol (boiling point 118°C) and benzoic acid (boiling point 249°C), it is considered that the main organic matter discharged from the filtration tower from period II to period III was 1-butanol, and the main organic matter discharged from the filtration tower in period IV was benzoic acid. However, even with these changes in the amount and types of organic matter in the exhaust steam, it can be seen that almost all organic matter is combusted and decomposed in the catalytic combustion device.

[0049] (Example 2) In Example 2, the filtration system regeneration system was operated under the same conditions as in Example 1, except that the control by the airflow control unit was disabled.

[0050] Figure 8 shows the changes in the inlet and outlet temperatures of the catalyst combustion section, and Figure 9 shows the changes in the amount of water vapor supplied to the filtration device. Compared to Example 1, in Example 2, the decrease in combustion exhaust gas temperature is slower because the amount of air is not adjusted, but the combustion temperature can be controlled within a range that prevents catalyst sintering by adjusting the amount of water vapor supplied by the gas flow control unit.

[0051] Figure 10 shows the changes in exhaust steam processing volume and power consumption in the catalytic combustion device. In Example 2, power consumption is approximately 25% higher than in Example 1 because the control by the air flow control unit is disabled.

[0052] Figure 11 shows the temperature changes in each part of the activated carbon filtration tower, and Figure 12 shows the changes in organic matter content before and after the catalytic combustion device. In the second embodiment, as in the first embodiment, it can be seen that the organic matter adsorbed on the filter material is evaporated, and almost all of the organic matter is combusted and decomposed in the catalytic combustion device.

[0053] (Comparative Example 1) As Comparative Example 1, the filtration system regeneration system was operated under the same conditions as in Example 1, except that the initial control unit, airflow control unit, and control by the airflow control unit were disabled.

[0054] Figure 13 shows the changes in the catalytic combustion chamber inlet and outlet temperatures. As shown in the figure, in Comparative Example 1, immediately after supplying regenerative exhaust gas to the catalytic combustion device, the combustion exhaust gas temperature, i.e., the catalyst temperature, rose sharply and reached 600°C, a temperature at which sintering can occur, forcing the operation to be stopped. The reason why the catalytic combustion chamber inlet temperature rose despite the preheater temperature of the catalytic combustion device being set to 300°C is that heat exchange occurred between the high-temperature combustion exhaust gas and the supplied combustion air in the heat exchange section within the catalytic combustion device.

[0055] As described above, it has been confirmed that by using the filtration device regeneration system according to the present invention, even a filtration device that has adsorbed a large amount of organic solvent with a relatively low boiling point can have its filter material regenerated while preventing catalyst sintering. [Explanation of symbols]

[0056] 1. Filtration system regeneration system 10 Filtration device 11 Filter media 20 Regenerative gas supply lines 21 Regeneration gas flow rate adjustment unit 22 Ejectors 23 Heater 211 Restricted flow path 212 Shut-off valve 213 Throttle valve 30 Regenerative exhaust gas line 31 Temperature sensor 32 Induction valve 40 Recirculation Line 41 Check valve 42 Reflux valve 50 Browline 51 Discharge valve 60 Catalytic combustion system 61 Mixing section 62 Preheating section 63 Catalytic combustion section 64 Heat exchange section 65 Cooling section 66 Exhaust fan 67 Combustion temperature sensor 70 Air supply line 71 Air flow rate adjustment unit 80 Control device 81 Preheating control unit 82 Initial Control Unit 83 Gas flow control unit 84 Air flow control unit

Claims

1. A regeneration gas supply line that supplies regeneration gas to a filtration device that removes organic matter from gases or liquids using a filter medium, A regenerated exhaust gas line for discharging regenerated exhaust gas from the aforementioned filtration device, A catalytic combustion device that burns organic matter contained in the regenerative exhaust gas by preheating a mixed gas, which is obtained by mixing combustion air with the regenerative exhaust gas discharged from the aforementioned regenerative exhaust gas line, and bringing it into contact with a catalyst. An air supply line that supplies combustion air to the catalytic combustion device, A control device that adjusts the flow rate of regenerative gas in the regenerative gas supply line so as to maintain the combustion temperature of the mixed gas in the catalyst within a predetermined range, Equipped with, The regeneration gas supply line has a regeneration gas flow rate adjustment unit that adjusts the flow rate of the supplied regeneration gas, The control device comprises a gas flow control unit that controls the regeneration gas flow rate adjustment unit to reduce the flow rate of regeneration gas when it is determined that the combustion temperature of the mixed gas in the catalyst exceeds a predetermined gas limit temperature, and an initial control unit that controls the regeneration gas flow rate adjustment unit to temporarily reduce the flow rate of regeneration gas when the preheating of the filtration device is completed, and then gradually increase the flow rate of regeneration gas.

2. The filtration apparatus regeneration system according to claim 1, wherein the regeneration gas flow rate adjustment section is provided in parallel and includes a plurality of flow paths, each having an on / off valve.

3. The air supply line or the catalytic combustion device has an air flow rate adjustment unit that adjusts the flow rate of combustion air, The filtration device regeneration system according to claim 1 or 2, wherein the control device further comprises an air flow control unit that controls the air flow rate adjustment unit to reduce the flow rate of combustion air when it is determined that the combustion temperature of the mixed gas in the catalyst falls below a predetermined air limit temperature.

4. The filtration apparatus regeneration system according to any one of claims 1 to 3, wherein the filter material is activated carbon.

5. The filtration apparatus regeneration system according to any one of claims 1 to 4, wherein the regeneration gas is water vapor.

6. The regenerated exhaust gas line has a discharge valve that discharges the condensate of the regenerated exhaust gas flowing out of the filtration device to the outside of the system. The filtration device regeneration system according to any one of claims 1 to 5, wherein the control device further comprises a preheating control unit that controls the discharge valve to discharge the regenerated exhaust gas or condensate out of the filtration device until the temperature of the regenerated exhaust gas or condensate flowing out of the filtration device reaches its saturation temperature.

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