JP2018134641A - Gas treatment facility and operation method of the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gas treatment facility which enables easy maintenance and continuous operation over a long time period while using a filter member for removing oil contents from an oil content including gas.SOLUTION: A gas treatment facility includes: a filter member 10 which recovers oil contents from an oil content including gas; and a cleaning mechanism 12 which cleans the filter member 10. The gas treatment facility includes a position change mechanism 11 which changes a position of the filter member 10 between an oil content recovery position where the entire filter member 10 is disposed at a gas flow part 2 to recover oil contents accompanying a gas with the filter member 10 and a cleaning position where the entire filter member 10 is disposed at the cleaning mechanism 12 to separate the recovered oil contents from the filter member 10. The gas treatment facility includes a vibration mechanism 11b which vibrates the filter member while placing the filter member 10 in contact with a cleaning fluid in the cleaning position.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a gas processing facility including a filter member that recovers oil from an oil-containing gas, and a cleaning mechanism that cleans the filter member, a control device for the gas processing facility, and a method for operating the gas processing facility.

  Conventionally, sludge generated in sewage treatment plants, human waste treatment plants, various industrial wastewater treatment plants, etc. has been incinerated or melted through a concentration and dehydration process. By using the organic components contained in such sludge as a heat source, the consumption of fossil fuel required for incineration and melting disposal can be suppressed, and therefore a dehydration process has been performed before incineration and melting disposal. A sludge drying facility for drying sludge has been established.

  FIG. 13 illustrates such a sludge drying facility 100. The sludge drying facility 100 includes a sludge dryer 120 including a hot air furnace 110 as a heat source, a hot air circulation fan 170 that guides the exhaust gas of the sludge dryer 120 to the hot air furnace 110, and the exhaust gas is circulated and supplied to the hot air furnace 110. It is comprised so that. High-temperature exhaust gas or auxiliary fuel is introduced into the hot stove 110 as a heat source, and the exhaust gas of the sludge dryer 120 is heated to 300 to 800 ° C.

  In the sludge dryer 120, the sludge is dried at a temperature of 300 to 800 ° C., and the exhaust gas of 120 to 200 ° C. is guided to the cyclone 130 and the scrubber 140 provided in the exhaust gas flow path. In the cyclone, solid foreign substances accompanying the exhaust gas are removed, and in the scrubber 140, moisture is condensed and removed from the exhaust gas by rapid cooling.

  On the downstream side of the scrubber 140, a demister 150 and a mist separator 160 are disposed, and oil and other oils such as moisture and tar contained in the exhaust gas that has passed through the scrubber 140 are removed. The oil such as tar is mixed in the exhaust gas when part of the organic components contained in the sludge is thermally decomposed when being dried by the sludge dryer 120.

  Oil or ash such as tar that has not been sufficiently removed by the demister 150 or the mist separator 160 adheres to the impeller of the hot air circulation fan 170, and the load of the hot air circulation fan 170 gradually increases and vibrations occur in the hot air circulation fan 170 itself. There is a risk of causing an abnormal situation such as. Furthermore, when oil or ash such as tar adheres and accumulates on the heat transfer surface of the subsequent hot stove 110 and coking occurs, there is a problem that not only heat transfer loss occurs but also the pressure loss of the hot stove 110 increases. .

  For this reason, if a dedicated device for continuously washing the impeller with water is installed or if the demister 150 and the mist separator 160 are frequently maintained, there is a problem that the equipment cost and the maintenance cost increase. In particular, the demister 150 having a thickness of about 100 mm is installed horizontally, and the configuration is such that tar or the like adhering to the lower surface of the demister exclusively along the flow of the exhaust gas from the lower side to the upper side is removed with the washing water supplied from the upper surface of the demister. In the case of using the demister 150, it is necessary to frequently replace the demister 150 because washing water having sufficient detergency cannot reach the tar adhesion site and pressure loss increases and the load of the hot air circulation fan 170 further increases. There was also a problem that there was.

  Patent Document 1 discloses a tar saponification removing device that directly contacts a saponification solution made of an alkaline solution and exhaust gas to saponify and remove tar in the exhaust gas, and a collision wall on which the exhaust gas collides. In addition, an inertia dust collector having a collision wall adhesion prevention liquid supply means for supplying a tar adhesion prevention liquid to the collision wall surface is provided, and the exhaust gas containing tar is supplied to the tar saponification removal device to saponify and remove the tar. Later, a tar-containing exhaust gas treatment facility for removing tar and supplying it to an inertia dust collector has been proposed.

JP 2005-279420 A

  However, in the tar-containing exhaust gas treatment facility described in Patent Document 1, not only a large amount of saponification solution is required, but the saponification solution is supplied from the upper part of the mesh-shaped collision wall installed in a horizontal position. Since it is configured to saponify by contacting with tar, the saponified product may remain on the mesh-like collision wall and gradually accumulate, which may increase the pressure loss of the exhaust gas passage, and it is necessary to frequently clean the collision wall In addition, there is a problem that it is necessary to manually replace the collision wall at the time of maintenance, and it is not only necessary to take measures for ensuring safety, but also complicated work is required.

  Therefore, when the saponification liquid is supplied from the lower part of the collision wall, the saponification liquid is subjected to resistance due to the collision wall and gas flow, and does not reach the upper layer side of the collision wall having a large amount of tar, so that there is a problem that the saponification treatment cannot be performed sufficiently.

  In addition, there is a problem that the oil content is accompanied by the cleaning liquid mist and flows out to the subsequent stage to reduce the oil recovery rate.

  A similar problem is the need to recover oil from oil-containing gases such as gas generated in biomass gasification and carbonization processes, gas generated in biomass drying processes, and gas generated in coal carbonization processes. It was a problem common to gas processing facilities.

SUMMARY OF THE INVENTION In view of the problems described above, while using a filter member for removing oil from oil-containing gas, maintenance of continuous operation possible gas processing set 備及 beauty gas processing facility over a easy and prolonged The point is to provide a driving method.

In order to achieve the above-described object, the first characteristic configuration of the gas treatment facility according to the present invention includes a filter member for recovering oil from an oil-containing gas, and the filter member as described in claim 1 of the claims. A gas processing facility including a cleaning mechanism for cleaning , wherein the entire filter member is disposed in a gas flow part, and an oil component recovery position for recovering oil components accompanying the gas by the filter member; and the entire filter member A position changing mechanism for changing the position of the filter member between a cleaning position for separating the recovered oil from the filter member by contacting the filter member with the cleaning liquid at the cleaning position. The vibration member is provided with a vibration mechanism that vibrates the filter member .

According to the above-described configuration, the oil contained in the oil-containing gas is captured by the filter member whose position is changed to the oil recovery position by the position changing mechanism, and the filter member that is contaminated by capturing the oil is moved to the cleaning position by the position changing mechanism. Since the cleaning is performed after the position is changed, it is not necessary to manually remove the filter member from the apparatus. In addition, the filter member whose position has been changed to the cleaning position is vibrated by a vibration mechanism in contact with the cleaning liquid, such as reciprocating motion, peristalsis, forward / reverse rotation, etc. Dirt is easily removed and cleaning efficiency is improved.

In the second characteristic configuration, in addition to the first characteristic configuration described above, the position changing mechanism advances the filter member between the oil recovery position and the cleaning position. The vibration mechanism is composed of a cylinder mechanism that drives or retracts, and the cylinder mechanism that repeats advancing driving and retracting driving at a short distance at the cleaning position.

When the filter member is vibrated up and down in contact with the cleaning liquid by repeating the advance and retreat drive of the cylinder mechanism at a short distance, the dirt such as oil captured by the filter member is released by the dirt being pushed by the cleaning liquid. Cleaning efficiency is improved.

In the third feature configuration, as described in claim 3, in addition to the first or second feature configuration described above, the cleaning mechanism is configured to immerse the entire filter member in a cleaning liquid at the cleaning position. The tank is equipped with a tank.

The entire filter member is dipped in the cleaning liquid inside the cleaning tank and becomes wet, and the filter member is vibrated in that state, so that the filter member is efficiently cleaned.

In the fourth feature configuration, in addition to the first or second feature configuration described above, the cleaning mechanism is immersed in a cleaning liquid with respect to the filter member at the cleaning position. In this respect, a liquid supply unit that injects and supplies the cleaning liquid from the back side toward the oil recovery surface side is provided.

Since the cleaning liquid is supplied from the liquid supply unit toward the filter member, the foreign matter containing oil efficiently separates from the filter member.

The characteristic configuration of the operation method of the gas processing facility according to the present invention includes a filter member that recovers oil from an oil-containing gas and a cleaning mechanism that cleans the filter member as described in claim 5. An operation method of the equipment, wherein the entire filter member is disposed in the gas flow part, and an oil component recovery position for recovering the oil component accompanying the gas by the filter member, and the entire filter member is disposed in the cleaning mechanism. A position changing step for changing the position of the filter member between a cleaning position for separating the recovered oil from the filter member is provided, and the filter member is vibrated while the filter member is in contact with the cleaning liquid at the cleaning position. It is in the point provided with the vibration step to perform.

As described above, according to the present invention, while using a filter member for removing oil from oil-containing gas, a method of operating maintenance easy and continuous operation possible gas processing set 備及 beauty gas treatment equipment for a long period of time Can now be provided.

Explanatory drawing of the sludge drying equipment in which the gas treatment equipment according to the present invention is incorporated (A) is explanatory drawing seen from the side of gas processing equipment, (b) is explanatory drawing seen from the same front Schematic of gas processing equipment with filter member located at oil recovery position Schematic of gas processing equipment with filter member located at cleaning position Schematic of another embodiment of gas processing equipment Schematic of another embodiment of gas processing equipment Schematic of another embodiment of gas processing equipment It is the schematic of another embodiment of gas processing equipment, (a) is an oil recovery position, (b) is a schematic diagram showing a washing position. It is the schematic of another embodiment of gas processing equipment, (a) is a front view, (b) is a top view Schematic of another embodiment of gas processing equipment Illustration of sludge drying equipment with gas treatment equipment arranged in parallel Table showing the results of oil removal experiments from simulated filter material Illustration of conventional sludge drying equipment

Hereinafter, a first embodiment of a gas processing facility according to the present invention will be described.
FIG. 1 shows a sludge drying facility 100 installed in a sewage treatment plant. The sludge drying facility 100 includes a sludge dryer 120 including a hot air furnace 110 as a heat source, a hot air circulation fan 170 that guides the exhaust gas of the sludge dryer 120 to the hot air furnace 110, and the exhaust gas is circulated and supplied to the hot air furnace 110. It is comprised so that. High-temperature exhaust gas or auxiliary fuel is introduced into the hot stove 110 as a heat source, and the exhaust gas of the sludge dryer 120 lowered to 40 to 50 ° C. is heated to 300 to 800 ° C.

  The sludge is dried by the sludge dryer 120 using hot air of 300 to 800 ° C. and discharged as dry sludge. The 120 to 200 ° C. exhaust gas discharged from the sludge dryer 120 is a cyclone 130 and a scrubber provided in the exhaust gas flow path. 140. The cyclone 130 removes solid foreign substances accompanying the exhaust gas, the scrubber 140 condenses and removes moisture from the exhaust gas by rapid cooling, and the demister 150 removes moisture accompanying the gas. The exhaust gas that has fallen to 40 to 50 ° C. is heated to 300 to 800 ° C. in the hot stove 110.

  The gas treatment facility 1 according to the present invention is provided in two stages in series along the gas flow direction on the downstream side of the demister 150 to remove foreign matters including oil such as tar contained in the exhaust gas that has passed through the demister 150. As a result, a situation in which oil or ash such as tar adheres to the impeller of the hot air circulation fan 170 or further adheres to and accumulates on the heat transfer surface of the hot air furnace 110 in the subsequent stage is avoided.

  As shown in FIGS. 2A and 2B, the gas processing facility 1 includes a gas flow section 2, a filter member 10, a position changing mechanism 11, a cleaning mechanism 12, a control device C, and the like. Yes.

  The gas flow part 2 is a substantially horizontal flow path for guiding the oil-containing gas (exhaust gas) discharged from the sludge dryer 120, and the flange diameters of the inlet and outlet to which the exhaust gas inflow pipe and the outflow pipe are connected are about 150 mm, The distance between the inlet and outlet flange surfaces is set to about 500 mm. An enlarged diameter space for filtration in which the filter member 10 is arranged is formed in the central portion of the gas flow portion 2, and foreign matters including oil mixed in the exhaust gas are removed by the filter member 10 arranged in the enlarged diameter space. . Note that the flange diameter and the space between the flange surfaces are examples, and are determined by the gas amount, the area of the filter, and the like.

  The filter member 10 is a member for separating the oil and dust such as tar accompanying the exhaust gas by inertial collision, and is formed in a mesh shape using a wire such as a metal wire using SUS316 or the like, and one side is 220 mm. A rectangular metal net is overlapped to form a thickness of 100 mm. The periphery of the filter member 10 is fixed to the support frame 10a. When the exhaust gas flows into the upstream side surface of the filter member 10 from the upstream side of the gas flow part 2 (hereinafter referred to as “oil content recovery surface”) and flows to the downstream side surface (hereinafter referred to as “back surface”). In addition, oil and the like accompanying the exhaust gas are captured by the filter member 10, mainly the oil recovery surface.

  In addition, the raw material and size which comprise the filter member 10 are illustrations, and are not restrict | limited to the said raw material and size. The material, thickness, cross-sectional shape, and number of meshes of the wire are selected in consideration of the pressure loss, collection efficiency, and cleaning efficiency of the filter, and metal punching metal may be used instead of the metal net. Furthermore, a resin net or a nonwoven fabric using a resin material such as PP, PE, PVC, or PTFE may be employed, or a packed layer in which a mesh container is filled with a bead-shaped resin member may be employed for the filter member 10. Good.

  The cleaning mechanism 12 is a mechanism for cleaning foreign matter including oil captured by the filter member 10, and is disposed immediately below the diameter expansion space of the gas flow part 2. The position changing mechanism 11 has the filter member 10 disposed in the gas flow section 2 to recover the oil component that collects the oil accompanying the gas, and the filter member 10 is disposed in the cleaning mechanism 12 to separate the recovered oil component. It is a mechanism which changes the position of the filter member 10 between.

  The position changing mechanism 11 compresses the air cylinder 11b, a support portion 11a erected directly above the diameter expansion space of the gas flow portion 2 via an upper shielding member 11e, an air cylinder 11b disposed at the upper end of the support portion 11a, and the air cylinder 11b. The cylinder mechanism includes a fluid circuit FC (see FIGS. 3 and 4) driven by air.

  A hollow link member 11d is connected to the tip of the piston 11c of the air cylinder 11b, and the support frame 10a of the filter member 10 is fixed to the tip of the link member 11d. A through-hole through which the link member 11d moves up and down via a seal member is formed in the upper shielding member 11e, and the filter member 10 is moved to the oil recovery position by retreating the piston 11c (see FIG. 2B). The filter member 10 is moved to the cleaning position by moving the piston forward (shown by a solid line in FIG. 2B).

  Pressure sensors GS are arranged on the upstream side and downstream side of the gas flow part 2 with the filter member 10 interposed therebetween, and the degree of contamination of the filter member 10 can be monitored by the differential pressure between the two sensors. That is, the differential pressure sensor PS is constituted by two pressure sensors.

  The cleaning mechanism 12 includes a cleaning tank 13, a foreign matter removing mechanism 14, a cleaning liquid supply mechanism 15, and a heating mechanism 16.

  The cleaning tank 13 is a liquid tank for cleaning the filter member 10, and the liquid level is adjusted so that almost the entire filter member 10 is immersed in the cleaning liquid at the cleaning position. In this embodiment, an alkaline cleaning liquid (an aqueous sodium hydroxide solution having a concentration of about 5% by weight and a temperature of about 40 ° C.) is used.

  The cleaning liquid supply mechanism 15 includes a liquid supply part 15a, a drainage part 15b, a cleaning liquid circulation mechanism 15c, and a cleaning liquid replenishment part 15d.

  The liquid supply part 15a is a part that supplies the cleaning liquid supplied from the drainage part 15b via the cleaning liquid circulation mechanism 15c substantially evenly from the back side of the filter member 10, and a slit-like nozzle formed in the horizontal direction is a filter. The cleaning liquid header portion is arranged in a plurality of stages along the vertical direction of the member 10. As the cleaning liquid of a predetermined pressure supplied from each nozzle flows from the back side of the filter member 10 to the oil recovery surface side, the foreign matter containing the oil captured by the filter member 10 is saponified and detached from the filter member 10. Removed.

  At this time, if the filter member 10 is caused to vibrate up and down in the cleaning liquid by repeating the advance drive and the retraction drive of the air cylinder 11b at a short distance, the oil content or the like captured by the filter member 10 is pressed by the cleaning liquid. Dirt is easily removed and cleaning efficiency is improved. That is, the vibration mechanism that vibrates the filter member 10 at the cleaning position by the cylinder mechanism can be configured. A vibration mechanism other than the air cylinder 11b may be provided. For example, a drive mechanism may be provided that drives the link member 11d to rotate forward and backward around the axis or peristally drive. Such a drive mechanism can be composed of a gear fitted in the link member 11d and a motor for driving the gear.

  The drainage part 15b is a part where the cleaning water supplied to the cleaning tank 13 is collected in order to circulate, and is below the liquid level so as not to be accompanied by foreign matters such as oil and saponified substances floating in the cleaning liquid. Then, it is provided below the liquid supply part 15 a formed in the cleaning tank 13.

  The cleaning liquid circulation mechanism 15c includes a conduit, a valve mechanism, and a pump that circulates and supplies the cleaning liquid recovered from the drainage section 15b to the liquid supply section 15a and a foreign substance derivation mechanism 14b described later (see FIGS. 3 and 4). .)

  The cleaning liquid replenishing unit 15d is a part that replenishes the cleaning liquid through a different path from the cleaning liquid circulation mechanism 15c in order to maintain the liquid level in the cleaning tank 13 substantially constant, and the value of the liquid level meter provided in the cleaning tank 13 is constant. It is configured to be replenished and supplied from a cleaning liquid tank (not shown) as necessary.

  The foreign matter removing mechanism 14 includes an overflow mechanism 14a for overflowing a floating substance such as a saponified product and oil together with the cleaning liquid from the cleaning tank 13, and generates a flow toward the overflow mechanism 14a on the liquid surface of the cleaning liquid to float on the liquid surface. And a foreign matter derivation mechanism 14b for guiding the water to the overflow mechanism 14a.

  The cleaning liquid is replenished by the cleaning liquid replenishing section 15d to restore the liquid level lowered by the overflow of the cleaning liquid from the overflow mechanism 14a, and the function of the overflow mechanism 14a is maintained. Since the cleaning liquid replenishing portion 15d is located below the cleaning liquid level and below the overflow mechanism 14a, the replenished new cleaning liquid does not flow directly into the overflow mechanism 14a, so It is also possible to suppress soiling.

  The washing liquid overflowed from the overflow mechanism 14a is drained to a solid-liquid separator (not shown) through a U-shaped tube, and is supplied as raw water of a sewage treatment facility after solid content such as saponification is removed. Treated as sewage. A water-sealing mechanism is configured by the U-shaped tube and a predetermined amount of cleaning liquid stored in the U-shaped tube, so that the space of the gas flow part 2 where the filter member 10 is disposed and the cleaning tank 13 is hermetically sealed. It is configured. Note that the cleaning liquid after the solid-liquid separation can be circulated and supplied via the above-described cleaning liquid circulation mechanism 15c.

  The flow direction of the cleaning liquid supplied by the foreign matter derivation mechanism 14b and the flow direction of the cleaning liquid supplied by the liquid supply unit 15a are set to be orthogonal to each other in plan view, and the supply position of the cleaning liquid supplied by the foreign matter derivation mechanism 14b Is set on the liquid surface side with respect to the supply position of the cleaning liquid supplied by the liquid supply unit 15a, the mutual interference of the flow of the cleaning liquid is reduced in the cleaning tank, and the cleaning ability is reduced due to the disturbance of the flow. A decrease in the ability to lead out foreign matter is avoided. In addition, by setting the flow direction of the cleaning liquid supplied by the foreign matter derivation mechanism 14b and the flow direction of the cleaning liquid supplied by the liquid supply unit 15a to be parallel in a plan view, the foreign matter can be more efficiently derived. You can also.

  Further, although the flow of the cleaning liquid has been described as the foreign matter derivation mechanism 14b, other means such as a push-down with a gas such as air or a push-out with a scraper may be used.

  The heating mechanism 16 is composed of three heaters disposed on the bottom surface of the cleaning tank 13 and is a heat exchange part for heating the cleaning liquid so that the temperature of the cleaning liquid in the cleaning tank 13 is maintained at about 40 ° C. Electricity is used as a heat source for the heater, but it is also possible to use hot exhaust gas generated in a sludge incinerator, hot water or steam exchanged with the exhaust gas, or the like. The heating mechanism 16 can be installed without interfering with the filter member 10 immersed and cleaned in the cleaning tank 13 by being provided at the bottom of the cleaning tank 13, and the cleaning liquid around the filter member 10 positioned above the heating mechanism 16. Heat can be efficiently transferred, and the temperature of the cleaning liquid can be raised.

  Complementarily controlling the position of the filter member 10 so that when the filter member 10 of one gas processing facility 1 is positioned at the cleaning position, the filter member 10 of the other gas processing facility 1 is positioned at the oil recovery position As a result, the sludge drying facility 100 can be operated continuously for a long time.

  As shown in FIG. 3 and FIG. 4, when the output of the differential pressure sensor PS reaches the first predetermined pressure, the control device C of the gas processing facility 1 controls the position changing mechanism 11 to recover the position of the filter member 10 to the oil content. The position change control unit C1 that changes the position from the position to the cleaning position, and the liquid supply control so that the cleaning liquid is supplied from the back side of the filter member 10 to the oil collecting surface side after being changed to the cleaning position by the position change control unit C1. And a heating control unit that heats the cleaning liquid supplied from the liquid supply unit 15a to a predetermined temperature by the heating mechanism 16 when the output of the differential pressure sensor PS becomes a second predetermined pressure lower than the first predetermined pressure. C3.

  When the amount of oil adhering to the filter member 10 increases, the filter member 10 becomes clogged and the passing gas flow rate decreases, and a pressure difference occurs between the upstream side and the downstream side of the gas flow part 2 across the filter member 10. . The position change control unit C1 estimates the degree of contamination of the filter member 10 based on the output of the differential pressure sensor PS that has detected the pressure difference. When the pressure difference reaches the first predetermined pressure, it is time to clean the filter member 10. The position of the filter member 10 is automatically changed from the oil recovery position to the cleaning position. Thereafter, the liquid supply control unit C2 automatically supplies the cleaning liquid from the back side of the filter member 10 to the oil collecting surface side for cleaning.

  Further, if the cleaning liquid reaches a predetermined temperature when the output of the differential pressure sensor PS reaches the first predetermined pressure, the cleaning time can be shortened because the cleaning liquid is not cleaned with a low temperature, that is, a cleaning liquid with a weak cleaning power. At the same time, there is no need to wait for the temperature to rise and an efficient cleaning process can be performed. Therefore, the second predetermined pressure is set so that the approximate time required to heat the cleaning liquid to the predetermined temperature is the time required to reach the first predetermined pressure from the second predetermined pressure. When the heating control unit C3 detects the second predetermined pressure, the heating control unit C3 controls the heating mechanism 16 so that the temperature sensor TS becomes about 40 ° C.

  The control devices C of the two gas processing facilities 1 are connected to each other via a communication line, and one control device C is set to function as a master control unit, and the other control device C is set to function as a slave control unit. Yes. Control is performed so that the filter member 10 on the master control unit side is positioned at the oil recovery position and the filter member 10 on the slave control unit side is positioned at the cleaning position in the initial state.

  After that, when the output of the differential pressure sensor PS on the master control unit side reaches the second predetermined pressure, the heating liquid in the cleaning tank 13 is heated and controlled by the heating mechanism 16 on the master control unit side, and when the first predetermined pressure is reached, slave control is performed. After the part-side filter member 10 is moved to the oil recovery position, the master control part-side filter member 10 is moved to the cleaning position.

  Thereafter, when the output of the differential pressure sensor PS on the slave control unit side reaches the second predetermined pressure, the heating liquid in the cleaning tank 13 is heated and controlled by the heating mechanism 16 on the slave control unit side. After the filter member 10 on the control unit side is moved to the oil recovery position, the filter member 10 on the slave control unit side is moved to the cleaning position.

  By repeating such control, the oil content can be continuously removed from the exhaust gas without flowing the exhaust gas containing the oil to the downstream side, and the sludge drying facility 100 can be operated continuously for a long time. Become.

  That is, when the pressure difference becomes the first predetermined pressure in the differential pressure monitoring step for monitoring the pressure difference between the upstream side and the downstream side of each gas flow section by the control device C described above, the position changing mechanism To change the position of the filter member from the oil recovery position to the cleaning position, and the liquid supply step to supply the cleaning liquid to the filter member after changing the position to the cleaning position in the position changing step And is executed.

  Further, when the control devices C are connected to each other via a communication line, the pressure difference between the upstream side and the downstream side of the gas flow section is monitored, and the pressure difference is detected at the first predetermined pressure in the differential pressure monitoring step. A position changing step of operating the position changing mechanism to move the filter member located at the cleaning position to the oil recovery position and repositioning the filter member located at the oil recovery position complementarily to the cleaning position; A liquid supply step is performed in which the filter member that has been changed to the cleaning position by the change step is supplied to supply the cleaning liquid from the back side to the oil recovery surface side.

  Caustic soda is preferably used as the raw material for the alkaline cleaning liquid, but raw materials other than caustic soda can also be used. In addition, since the caustic soda is used for the water treatment in the wastewater treatment plant where the sludge is discharged, it is preferable to use the caustic soda. The concentration of the alkaline cleaning liquid is preferably in the range of 1% by weight to 15% by weight, more preferably 3% by weight to 7% by weight, and further preferably 5% by weight ± 1% by weight. The alkaline cleaning liquid is preferably set in a range of 10 ° C. or more and 60 ° C. or less, more preferably 30 ° C. or more and 50 ° C. or less, and further preferably 40 ° C. ± 5 ° C. preferable.

  The cleaning time of the filter member 10 at the cleaning position may not be constantly cleaned as long as the pressure difference during oil recovery of the other filter member 10 reaches the first predetermined pressure at the oil recovery position. The cleaning may be completed in a certain time. Further, instead of cleaning, the filter member 10 may be vibrated and cleaned at the cleaning position.

  If there is no large variation in the amount of oil per hour, the degree of contamination of the filter member can be estimated from the elapsed time. Therefore, the control device C is provided with a timer for measuring the elapsed time after the filter member is repositioned to the oil content collection position, and the position change control unit controls the position change mechanism when the first set time is counted by the timer. The position of the filter member is changed from the oil recovery position to the cleaning position, and after the position change control unit changes the position to the cleaning position, the liquid supply control unit moves from the back side of the filter member to the oil recovery surface side. The liquid supply may be controlled so as to supply the cleaning liquid. Such elapsed time is preferably measured automatically by a timer, but it can also be performed by a timer that does not rely on a timer, such as a human time.

  In order to determine the set time, the position is initially controlled based on the pressure difference, the set time is determined after the approximate trend has been grasped by sampling a predetermined number of elapsed times of position change, and the position is controlled by the time. It may be switched so as to.

  Further, the second set time is set so that the approximate time required to heat the cleaning liquid to the predetermined temperature is the time from the second set time to the first set time, and the second set time is shorter than the first set time. When the set time is counted, the heating control unit may control the heating mechanism to heat the cleaning liquid to a predetermined temperature. In this case, since the cleaning liquid has reached the predetermined temperature when the output of the timer reaches the first set time, the cleaning process can be performed immediately, and the running cost can be reduced without wasting energy and time.

  Similarly to the above, when the output of the differential pressure sensor reaches the first predetermined pressure by connecting the control devices C with a communication line, the position change mechanism is controlled so that the filter member positioned at the cleaning position is moved to the oil recovery position. The position change control unit that changes the position of the filter member positioned at the oil content recovery position in a complementary manner to the cleaning position, and the cleaning liquid is supplied to the filter member that has been changed to the cleaning position by the position change control unit. In addition, it is possible to configure a control device including a liquid supply control unit that controls liquid supply.

  That is, by the above-described control device C, a time monitoring step for measuring the installation time of the filter member at the oil recovery position by a timer, and when the first set time has elapsed in the time monitoring step, the position changing mechanism is operated. A position changing step for changing the position of the filter member from the oil recovery position to the cleaning position, and a liquid supply step for supplying the cleaning liquid to the filter member after changing the position to the cleaning position in the position changing step are executed. The

  In addition, when the control devices C are connected to each other by a communication line, a time monitoring step of measuring the elapsed time of the filter member after the position change to the oil content collection position by a timer, and the elapsed time in the time monitoring step are first. A position changing step of operating the position changing mechanism to move the filter member positioned at the cleaning position to the oil recovery position and changing the position of the filter member positioned at the oil recovery position complementarily to the cleaning position when the set time is reached; Then, a liquid supply step of supplying the cleaning liquid to the oil collecting surface side from the back side to the filter member whose position has been changed to the cleaning position by the position changing step is executed.

Next, a second embodiment of the gas processing facility will be described.
In the above-described embodiment, the aspect in which the filter member 10 is immersed in the cleaning liquid stored in the cleaning tank 13 has been described. However, the cleaning mechanism 12 supplies the cleaning liquid to the filter member 10 while maintaining the filter member 10 in a wet state. It is only necessary to have a cleaning liquid supply mechanism, and it is not always necessary to immerse it.

  As shown in FIG. 5, the cleaning tank 13 is provided with a liquid supply part 15 a provided with a nozzle for spraying and supplying the cleaning liquid without filling the cleaning liquid with the cleaning liquid, and from the back side of the filter member 10 in the cleaning tank 13 to the oil recovery surface side. The cleaning liquid may be jetted and supplied.

  Foreign matter such as saponified oil removed from the filter member 10 by the cleaning liquid is guided to the separation mechanism 18 via the drainage part 15b provided near or near the bottom of the cleaning tank 13, and filth is removed by the separation mechanism 18. A cleaning liquid circulation mechanism 15c may be provided so as to be circulated and supplied as a cleaning liquid after the removal.

  As the separation mechanism 18, a specific gravity separation method or a solid-liquid separation method can be used. The separation mechanism 18 shown in FIG. 5 employs a specific gravity separation method, and includes a receiving tank 18a that receives the cleaning liquid drawn from the cleaning tank 13, and a guide plate 18b that guides the cleaning liquid upward from below the receiving tank 18a. ing. Foreign matter having a specific gravity smaller than that of the cleaning liquid floats in the receiving tank 18a without passing through the lower end of the guide plate 18b, and only the cleaning liquid that has passed through the lower end of the guide plate 18b is circulated and supplied as the cleaning liquid by the cleaning liquid circulation mechanism 15c. . As the separation mechanism 18 employing the solid-liquid separation method, a filtration method using a filter mechanism such as a filter cloth or a mesh can be employed.

  The heating mechanism 16 is not necessarily provided in the cleaning tank, and a heating mechanism for heating the cleaning liquid sprayed and supplied from the liquid supply unit 15a may be provided in front of the liquid supply unit 15a. For example, a heating mechanism may be provided in the receiving tank 18a, and the heated cleaning liquid may be circulated and supplied to the liquid supply unit 15a.

Hereinafter, other embodiments of the gas processing facility will be described.
In both the first and second embodiments, the oil-containing gas is allowed to flow in the horizontal direction and the cleaning position is provided below the oil-recovery position. However, the oil-containing gas is allowed to flow in the vertical direction. The cleaning position may be provided on the side of the oil recovery position.

  As shown in FIG. 6, for example, the oil-containing gas can be configured to flow through the gas flow part 2 from above to below. In this case, since the upper side of the filter member 10 serves as an oil recovery surface, it is easy to immerse the oil in the cleaning liquid and allow the oil to float on the liquid surface.

  However, since it is difficult for the position changing mechanism 11 that moves linearly in the horizontal direction to immerse the filter member 10 in the cleaning liquid previously filled in the cleaning tank 13, the filter member 10 is moved from the oil recovery position to the cleaning position in the position changing step. The position may be changed to the position and the cleaning tank 13 may be configured to be supplied to the cleaning tank 13 after sealing between the cleaning tank 13 and the gas flow passage 2 with the seal member 17.

  Further, the position changing mechanism 11 is provided with a rotating mechanism for reversing the oil collecting surface and the back surface of the filter member 10, and the oil collecting surface to which the oil has adhered at the oil collecting position is reversed so as to face downward at the cleaning position. The oil may be dropped by spraying and supplying the cleaning liquid from the back side of the nozzle.

  As shown in FIG. 7, the oil-containing gas may be configured to flow through the gas flow part 2 from below to above. In this case, since the lower side of the filter member 10 is the oil recovery surface, it is easy to spray and supply the cleaning liquid to the filter member 10 from the rear side to directly drop the dirt.

  Similarly, the position changing mechanism 11 is provided with a rotating mechanism for reversing the oil recovery surface and the back surface of the filter member 10, and the oil recovery surface to which oil has adhered at the oil recovery position is reversed so that the oil recovery surface faces upward at the cleaning position. It is also possible to configure so that the oil component is floated on the liquid surface by being immersed in the liquid.

  As shown in FIGS. 8A and 8B, instead of the position changing mechanism 11 having the cylinder mechanism as described above, the position changing mechanism 11 is configured by an electric motor M and a spindle that is rotationally driven by the electric motor M. May be. When the filter member 10 is attached to a support shaft that is rotationally driven by the electric motor M, for example, when the support shaft rotates 180 degrees, between the oil recovery position shown in FIG. 8A and the cleaning position shown in FIG. 8B. You may comprise so that a position may switch. Also in this case, the design of the gas flow direction can be arbitrarily changed.

  As shown in FIGS. 9A and 9B, the position changing mechanism 11 is configured by the motor M and the shaft that is rotationally driven by the motor M, and the shaft is centered on the filter member 10 formed in a disk shape. The gas flow part 2 and the cleaning tank 13 may be arranged in different regions, for example, 180 ° different regions with the rotation axis of the disk-shaped filter member interposed therebetween.

  By continuously driving the motor M, the position of the filter member 10 is continuously changed from the oil recovery position to the cleaning position, or by driving the motor M stepwise, the filter member 10 is changed from the oil recovery position to the cleaning position. The position is changed stepwise.

  In the embodiment described above, an example in which the filter member 10 is cleaned using an alkaline cleaning liquid has been described. However, hot water in a predetermined temperature range can be used instead of the alkaline cleaning liquid. In this case, since the oil component floats in the cleaning solution, the cleaning solution and the oil component can be easily separated using the specific gravity separation method described above.

  In the above-described embodiment, the mode in which the two gas processing facilities 1 are connected in series along the exhaust gas flow path has been described. However, two or more units are connected in series along the exhaust gas flow path. May be.

  Further, as shown in FIG. 10, two filter members 10 are arranged in series in the gas flow section of one gas processing facility 1, and both filter members 10 are disposed between the oil recovery position and the cleaning position. You may comprise so that it may move complementarily. Similarly, three or more filter members 10 may be arranged in series in the gas flow section of one gas processing facility 1 so that at least one filter member is located at the oil recovery position. .

  As shown in FIG. 11, two gas treatment facilities 1 are installed in parallel along the exhaust gas flow path of the sludge drying facility 100, and each filter member 10 is complementarily between the oil recovery position and the cleaning position. The position may be switched. In this case, the exhaust gas flow path is branched on the upstream side of the gas processing facility 1 and merged on the downstream side, and the damper mechanism 190 is provided in the upstream separation path, and the exhaust gas is in any one of the branch paths. The filter member of the gas processing facility 1 provided in the branch passage where the exhaust gas flows down is located at the oil recovery position, and the filter member of the gas treatment facility 1 provided in the other branch passage is located in the cleaning position. A control device that controls the position switching mechanism may be configured.

  For example, when the output of the differential pressure sensor with respect to one filter member positioned at the oil recovery position reaches the first predetermined pressure, the control device moves the other filter member positioned at the cleaning position to the oil recovery position. The damper mechanism 190 may be switched, and then the one filter member may be moved from the oil recovery position to the cleaning position.

  Further, two filter members 10 are arranged in parallel in the gas flow section of one gas treatment facility 1, and each filter member is installed so as to be located at the branch of the exhaust gas flow path of the sludge drying facility 100. Both filter members may be configured to move complementarily between the oil recovery position and the cleaning position.

  It is also possible to configure a gas processing facility that appropriately combines the various embodiments described above.

  In addition, it is also possible to use one gas processing equipment provided with a single filter member. However, in that case, oil cannot be recovered when the filter is washed, so it is possible to either allow it or stop the sludge drying equipment 100.

  Although the case where the gas treatment facility 1 is installed in the sludge drying facility 100 has been described in the above-described embodiment, it is needless to say that the gas treatment facility 1 according to the present invention can be applied to facilities other than the sludge drying facility 100. For example, as a gas processing facility that needs to recover oil from oil-containing gas such as gas generated in biomass gasification process and carbonization process, gas generated in biomass drying process, gas generated in coal carbonization process, etc. Can be widely used.

  In the embodiment described above, the aspect in which the demister is installed on the upstream side of the gas processing facility has been described, but the demister is not necessarily installed. Moreover, you may provide the mist separator which removes the water | moisture content accompanying exhaust gas in the downstream of a gas treatment facility.

  The various embodiments described above merely describe one specific example of the gas treatment facility according to the present invention, and the scope of the present invention is not limited by the description, and the specific configuration of each part is the function of the present invention. Needless to say, the design can be changed as appropriate within a range in which the effect is achieved.

  About 10 g of tar is applied to a filter member simulation material composed of two metal meshes (144 mesh) made of SUS316 with dimensions of 100 mm x 100 mm, and then immersed in caustic soda and warm water to separate the tar as oil. An experiment was conducted.

  From the experimental results shown in FIG. 12, when the temperature is in the range of 40 ° C. to 60 ° C. and a caustic soda aqueous solution having a concentration of 5% by weight is used as a cleaning solution for 30 minutes, a tar removal effect is exhibited with a separation rate of 90% or more. It was confirmed. It was also confirmed that the tar removal effect was exhibited at a separation rate of 86% when washing was performed for 30 minutes using warm water of 60 ° C. as the washing liquid.

  As a result of repeating the washing experiment in various concentration ranges, temperature ranges, and time ranges, the concentration of the alkaline cleaning solution is preferably in the range of 1 wt% to 15 wt%, more preferably 3 wt% to 7 wt%, and more preferably 5 wt%. % ± 1% by weight is more preferable, the alkaline cleaning liquid is preferably set in the range of 10 ° C. to 60 ° C., more preferably 30 ° C. to 50 ° C., and 40 ° C. ± 5 It has been found that the range of ° C is more preferred.

1: Gas treatment equipment 2: Gas flow section 10: Filter member 11: Position change mechanism 12: Cleaning mechanism 13: Cleaning tank 14: Foreign matter removal mechanism 14a: Overflow mechanism 14b: Foreign matter derivation mechanism 15: Cleaning liquid supply mechanism 15a: Liquid supply part 15b: Drainage part 15c: Cleaning liquid circulation mechanism 15d: Cleaning liquid replenishment part 16: Heating mechanism 18: Separation mechanism

Claims (5)

A gas processing facility comprising a filter member that recovers oil from an oil-containing gas, and a cleaning mechanism that cleans the filter member ,
The entire filter member is disposed in the gas flow portion, and an oil component recovery position for recovering the oil component accompanying the gas by the filter member, and the oil component recovered by disposing the entire filter member in the cleaning mechanism is extracted from the filter member. A position changing mechanism for changing the position of the filter member between the cleaning position and the separation position ;
A gas processing facility comprising a vibration mechanism that vibrates the filter member while bringing the filter member into contact with a cleaning liquid at the cleaning position. The position changing mechanism is composed of a cylinder mechanism that drives the filter member to advance or retract between the oil recovery position and the cleaning position,
The gas processing facility according to claim 1, wherein the vibration mechanism is configured by the cylinder mechanism that repeats advance drive and retract drive at a short distance at the cleaning position. The gas processing facility according to claim 1, wherein the cleaning mechanism includes a cleaning tank that immerses the entire filter member in a cleaning liquid at the cleaning position. The said washing | cleaning mechanism is provided with the liquid supply part which injects and supplies a washing | cleaning liquid from the back side toward an oil-component collection | recovery surface side, without making it immerse in the washing | cleaning liquid with respect to the said filter member in the said washing | cleaning position. Gas processing equipment. An operation method of a gas processing facility comprising a filter member for recovering oil from an oil-containing gas, and a cleaning mechanism for cleaning the filter member,
The entire filter member is disposed in the gas flow portion, and an oil component recovery position for recovering the oil component accompanying the gas by the filter member, and the oil component recovered by disposing the entire filter member in the cleaning mechanism is extracted from the filter member. A position changing step for changing the position of the filter member between the cleaning position and the separation position;
A method for operating a gas processing facility, comprising: an oscillating step of oscillating the filter member while bringing the filter member into contact with a cleaning liquid at the cleaning position.

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