CN119548940A - Organic waste gas recovery and treatment system and method - Google Patents
Organic waste gas recovery and treatment system and method Download PDFInfo
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- CN119548940A CN119548940A CN202510134136.XA CN202510134136A CN119548940A CN 119548940 A CN119548940 A CN 119548940A CN 202510134136 A CN202510134136 A CN 202510134136A CN 119548940 A CN119548940 A CN 119548940A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/002—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by condensation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/66—Regeneration of the filtering material or filter elements inside the filter
- B01D46/68—Regeneration of the filtering material or filter elements inside the filter by means acting on the cake side involving movement with regard to the filter elements
- B01D46/681—Regeneration of the filtering material or filter elements inside the filter by means acting on the cake side involving movement with regard to the filter elements by scrapers, brushes or the like
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
- B01D53/04—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with stationary adsorbents
- B01D53/047—Pressure swing adsorption
- B01D53/053—Pressure swing adsorption with storage or buffer vessel
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/26—Drying gases or vapours
- B01D53/265—Drying gases or vapours by refrigeration (condensation)
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
- B01D2253/10—Inorganic adsorbents
- B01D2253/102—Carbon
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/70—Organic compounds not provided for in groups B01D2257/00 - B01D2257/602
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- Treating Waste Gases (AREA)
Abstract
The invention relates to the technical field of waste gas treatment, and particularly discloses an organic waste gas recovery treatment system and method, wherein the organic waste gas recovery treatment system comprises a buffer tank, a condensation system, a PSA adsorption system and a treatment system, the condensation system comprises an induced draft fan and a condensation unit, a first inlet of the buffer tank is connected with a sample injection pipeline, a first outlet of the buffer tank is connected with a first inlet pipeline of the condensation unit, the induced draft fan is arranged in a pipeline connected with the condensation unit, and a pressure transmitter is arranged on an inlet pipeline of the induced draft fan; the PSA adsorption system comprises a first active carbon tank, a second active carbon tank and a vacuum pump, and the treatment system comprises a gas mixer, a fan, a regenerative oxidation furnace, a mixer and a bypass valve. The invention can realize high-efficiency treatment of the organic waste gas, can recover and treat the organic waste gas to the greatest extent, reduces the resource waste, reduces the frequency of adsorbent replacement and the risk of plugging and the operation load of subsequent equipment, saves the cost and improves the economic efficiency.
Description
Technical Field
The invention relates to the technical field of waste gas recovery and treatment, in particular to an organic waste gas recovery and treatment system and method.
Background
The traditional organic waste gas recovery and treatment mode is that the organic waste gas is directly treated by methods such as an absorption degassing method, a heat storage oxidation treatment and the like, the adsorption method can only treat organic waste gas with lower concentration, the adsorbent is easy to reach a saturated state, the adsorbent needs to be replaced frequently, the production cost is increased, if the adsorbent is not replaced in time to produce a plugging, the operation load of other equipment is increased to cause resource waste and safety problems if the adsorption effect is not ideal, and the heat storage oxidation treatment method can treat organic waste gas with high concentration, but cannot recycle high boiling point organic gas in part of the organic waste gas to cause resource waste.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides the organic waste gas recovery treatment system and the organic waste gas recovery treatment method, which can realize efficient treatment of the organic waste gas, can furthest recover the organic waste gas, reduce the resource waste, reduce the frequency of adsorbent replacement and the risk of plugging and the operation load of subsequent equipment, save the cost and improve the economic efficiency.
The aim of the invention can be achieved by the following technical scheme:
The organic waste gas recovery and treatment system comprises a buffer tank, a condensation system, a PSA adsorption system and a treatment system, wherein the condensation system comprises an induced air fan and a condensation unit, a first inlet of the buffer tank is connected with a sample injection pipeline, a first outlet of the buffer tank is connected with a first inlet pipeline of the condensation unit, the induced air fan is arranged in a pipeline connected with the condensation unit, and a pressure transmitter is arranged on an inlet pipeline of the induced air fan;
The PSA adsorption system comprises a first active carbon tank, a second active carbon tank and a vacuum pump, the treatment system comprises a gas mixer, a fan, a heat accumulating type oxidation furnace, a mixer and a bypass valve, the outlet of the condensing unit is connected with the lower inlet of the first active carbon tank and the lower inlet of the second active carbon tank, the top outlet of the first active carbon tank and the top outlet of the second active carbon tank are connected with the gas mixer pipeline, the upper inlet pipeline of the heat accumulating type oxidation furnace is connected with a burner, an oxidation chamber, a plurality of groups of heat accumulating type oxidation furnaces and a plurality of groups of lower chambers are arranged in the heat accumulating type oxidation furnace, ceramic fillers are arranged in the heat accumulating chambers, the gas mixer is connected with the lower inlets of the lower chambers of the heat accumulating type oxidation furnace, the fan is arranged in a pipeline connected with the lower inlets of the lower chambers of the heat accumulating type oxidation furnace, the upper outlet of the heat accumulating type oxidation furnace is connected with the upper inlet pipeline of the mixer, and the lower inlet pipeline is connected with the upper outlet of the heat accumulating type oxidation furnace, and the bypass valve is connected with the upper inlet pipeline of the heat accumulating type oxidation furnace.
Preferably, the condensing unit comprises a first-stage evaporator, a second-stage evaporator, a third-stage evaporator, an oil storage tank, a supercooling exchanger and a precooler, wherein an outlet of the oil storage tank is connected with a second inlet pipeline of the buffer tank, and a second inlet of the condensing unit is connected with a second air supply pipeline.
Preferably, the first active carbon tank and the second active carbon tank are arranged in parallel, a first air supply pipeline is connected with a top inlet of the first active carbon tank and a top inlet of the second active carbon tank, a cooling water pipeline is arranged on one side of the first active carbon tank, a cooling water pipeline is arranged on one side of the second active carbon tank, a lower outlet of the first active carbon tank and a lower outlet of the second active carbon tank are connected with a third inlet pipeline of the buffer tank, and a vacuum pump is arranged in a pipeline connecting the lower outlet of the first active carbon tank and the lower outlet of the second active carbon tank with the third inlet of the buffer tank.
Preferably, the sample injection pipeline is internally provided with a filtering component and a cleaning component, the filtering component comprises a first limiting frame and a filter screen, the first limiting frame is fixedly connected with the inner wall of the sample injection pipeline, the filter screen is slidably connected with the first limiting frame, the top of the filter screen is fixedly connected with an upper cover, the cleaning component comprises a hydraulic cylinder, an auxiliary frame and a cleaning brush, the hydraulic cylinder is fixedly connected with the cleaning brush, the auxiliary frame is fixedly connected with the cleaning brush, the position of the cleaning brush corresponds to the position of the filter screen, a limiting block is arranged above the sample injection pipeline, a through hole is formed in the limiting block, and the auxiliary frame penetrates through the through hole of the limiting block and is slidably connected with the limiting block.
Preferably, the below of filter screen is provided with retrieves the subassembly, retrieve the subassembly detachable connect in sampling pipeline below, retrieve the subassembly including collection box, connecting block and division board, the connecting block is T type setting, connecting block fixed connection in sampling pipeline, the division board pass through second fixed block and pin rotate connect in the connecting block, the division board is Z type setting, the division board with connecting block assorted.
Preferably, the inside drive assembly that is provided with clean frame and two sets of symmetries of collection box, drive assembly includes guide rail, supporting shoe, first spring and first fixed block, clean frame fixed connection in one side of collection box, the position of clean frame with the position of cleaning brush is corresponding, guide rail fixed connection in the collection box, the guide rail is the arc setting, the arc recess has been seted up along the outer wall shape on the guide rail.
Preferably, the first fixed block is fixedly connected to one side of the groove of the guide rail, the first spring is arranged at the groove of the guide rail, the first spring is matched with the groove of the guide rail, one side of the first spring is fixedly connected to the first fixed block, the other side of the first spring is fixedly connected to the supporting block, a protruding section matched with the supporting block is arranged at the groove of the guide rail, the supporting block is slidably connected to the guide rail through the protruding section, and a through hole matched with the guide rail is formed in the isolation plate.
Preferably, the buffer tank is internally provided with a spiral pipeline and an inner cylinder, the inner cylinder is internally provided with a buffer assembly, the buffer assembly comprises a buffer plate, a second spring, a supporting rod, a sleeve, a transition plate, a base and a limiting frame, the limiting frame is in annular arrangement, the limiting frame is fixedly connected with the inner wall of the inner cylinder, the buffer plate is arranged on the inner side of the limiting frame, the buffer plate is slidably connected with the limiting frame, and a sealing layer is arranged between the buffer plate and the limiting frame.
Preferably, the bottom of locating part is provided with round outstanding spacing section, be provided with a plurality of through-holes on the buffer board, the vaulting pole is provided with a plurality ofly, a plurality of vaulting pole fixed connection in buffer board lower part, the lower part fixedly connected with of vaulting pole the sleeve, the sleeve with the part that the vaulting pole is connected is provided with the damping layer, the second spring housing is located on the vaulting pole, transition board fixed connection in sleeve lower part, base fixed connection in transition board lower part.
An organic waste gas recovery treatment method comprises the following steps:
Treatment of organic waste gas:
S1, introducing organic waste gas into a sample introduction pipeline, filtering the organic waste gas, intercepting particulate matters in the organic waste gas, introducing the filtered organic waste gas into a buffer tank for buffering, and balancing the pressure fluctuation of the organic waste gas;
S2, introducing the buffered organic waste gas into a condensing unit for condensation treatment through an induced air fan, pre-cooling the organic waste gas by a precooler, introducing a first-stage evaporator to cool the organic waste gas to 0-5 ℃, removing most of water vapor and high-boiling organic waste gas components to obtain condensate A, introducing a second-stage evaporator to cool the organic waste gas which is not condensed at the first stage to-20 to-30 ℃ to separate out residual water vapor and medium-boiling organic waste gas components to obtain condensate B, introducing the organic waste gas components which are not condensed at the second-stage evaporator to-55 to-70 ℃, further separating out medium-low-boiling components to obtain condensate C, introducing the organic waste gas which is subjected to multi-stage condensation treatment into a supercooling exchanger and a precooler for heat exchange, and raising the temperature of the organic waste gas to 0-25 ℃ to obtain low-concentration organic waste gas;
S3, introducing the condensate A, the condensate B and the condensate C into an oil storage tank for recycling, introducing low-concentration organic waste gas into a first active carbon tank for adsorption treatment, automatically cutting the system into a second active carbon tank for adsorption treatment of the low-concentration organic waste gas after the first active carbon tank is saturated in adsorption, and simultaneously carrying out desorption treatment on the first active carbon tank to obtain organic waste gas A after the adsorption treatment;
S4, introducing the organic waste gas A and air into a heat accumulating type oxidation furnace through a gas mixer and a fan for oxidative decomposition treatment, preheating the organic waste gas A in a group of heat accumulating chambers, then heating the organic waste gas A in an oxidation chamber to 760-850 ℃, and oxidizing and decomposing organic components in the organic waste gas A to obtain high-temperature tail gas;
s5, introducing high-temperature tail gas into the other group of regenerators, performing heat exchange and cooling with ceramic filler in the regenerators to obtain tail gas, closing a bypass valve when the indoor temperature of the oxidation chamber of the regenerative oxidation furnace is in a set temperature range, introducing the tail gas into a mixer through the regenerators performing heat exchange, directly discharging the tail gas through a gas discharge pipeline, opening the bypass valve when the indoor temperature of the oxidation chamber of the regenerative oxidation furnace is higher than the set temperature range, introducing the tail gas into the mixer through the bypass valve for mixing and cooling, and discharging the tail gas through the gas discharge pipeline;
The active carbon tank is reused:
And S6, after the first activated carbon tank is adsorbed and saturated, introducing nitrogen into the first activated carbon tank through a first air supply pipeline, starting a vacuum pump, and performing vacuum desorption on the first activated carbon tank through the vacuum pump to reduce the pressure of an activated carbon bed, so that organic waste gas components adsorbed in the activated carbon are separated from a pore structure of the activated carbon, and are conveyed back to a buffer tank from the first activated carbon tank for subsequent treatment and recovery, wherein the first activated carbon tank can be continuously used.
The beneficial effects of the invention are as follows:
(1) Through setting up condensing system, the technical effect that can reach is that the component that has stronger volatility in the organic waste gas is before oxidation treatment, carries out recovery processing through condensing unit priority, gradually reduces oil gas temperature through setting up tertiary continuous cooling, can be the different components fractional condensation in the organic waste gas to liquid, improves recovery efficiency, reduces the wasting of resources, practices thrift the cost, improves economic benefits.
(2) Through setting up condensing system, PSA adsorption system and processing system, the technical effect that can reach is that set up two pipelines of connecting between heat accumulation formula oxidation furnace and the blender, the indoor temperature of cooperation heat accumulation formula oxidation furnace switches the pipeline of exhaust emission of being convenient for, avoid high temperature exhaust gas directly to discharge into the air, retrieve the partial component of organic waste gas through the condensing unit, the concentration of organic waste gas when making subsequent adsorption treatment reduces, and let in nitrogen gas and vacuum pump cooperation in to the active carbon jar through first gas supply pipeline, can carry out the vacuum desorption to the active carbon in the active carbon jar, make the active carbon jar can reuse, reduce the frequency of active carbon adsorbent change and the risk of shutoff, and the operation load of subsequent equipment, further improve the treatment effeciency of waste gas, two active carbon jars are parallelly connected, be convenient for switch the use, can guarantee that the whole waste gas treatment work can not stop because the active carbon adsorption reaches the saturated state when carrying out waste gas recovery treatment work, guarantee the treatment effeciency, with condensing unit, first active carbon jar, the active carbon jar and second active carbon jar and heat accumulation formula oxidation furnace cooperate, the organic waste gas in the maximum efficiency can be improved and the recovery efficiency.
(3) Through setting up filter component and clean subassembly, the technical effect that can reach is first spacing fixedly connected in the inner wall of sampling pipeline, is convenient for carry out spacingly and fixedly to the filter screen, auxiliary frame fixed connection in the cleaning brush improves the stability of cleaning brush when carrying out the up-and-down motion, through setting up the filter screen, can prefilter the particulate matter in the organic waste gas, improves follow-up treatment effeciency, through setting up the cleaning brush, is convenient for clean the filter screen, can reduce the frequency that the filter screen was changed, reduction processing cost.
(4) Through setting up the recovery subassembly, the technical effect that can reach is that the recovery subassembly can dismantle and connect in the sampling pipeline below, be convenient for clean and maintain, the position of clean frame is corresponding with the position of cleaning brush, be convenient for clean the cleaning brush when cleaning brush sweeps into the collection box with the impurity on the filter screen, avoid impurity to pile up on the cleaning brush, the efficiency when leading to the cleaning brush to clean the filter screen reduces, the backup pad plays the supporting role to the backup pad when the backup pad is in the horizontality, when cleaning brush downward movement promotes the backup pad, the backup pad drives backup pad and first spring along the guide rail motion, make the collection box be in the state of opening the door, be convenient for the cleaning brush sweeps into the collection box with impurity in, when cleaning brush upward movement to the collection box outside, first spring drives the backup pad along the guide rail motion resets, make the collection box be in the state of closing the door, impurity in the collection box is taken up when avoiding organic waste gas to import in the sampling pipeline, influence organic waste gas normal filtration.
(5) Through setting up the buffer unit, the technical effect that can reach is provided with the sealing layer between buffer board and the spacing, guarantees the gas tightness, when letting in organic waste gas, carries out the motion on the vertical direction along the spacing through buffer board, second spring, vaulting pole and sleeve mutually supporting, provides the buffer force, and balanced organic waste gas pressure fluctuation reduces the impact force that follow-up exhaust-gas treatment equipment received.
Drawings
The present invention is further described below with reference to the accompanying drawings for the convenience of understanding by those skilled in the art.
FIG. 1 is a schematic diagram of the process flow of the apparatus of the present invention;
FIG. 2 is a perspective view of a buffer tank and sample injection conduit in the present invention;
FIG. 3 is a cross-sectional view of the feed line and recovery assembly of the present invention;
FIG. 4 is a block diagram of a filter assembly, a cleaning assembly and a recovery assembly of the present invention;
FIG. 5 is a block diagram of a partial recovery assembly of the present invention;
FIG. 6 is a view showing the construction of the inside of the recovery tank according to the present invention;
FIG. 7 is a first cross-sectional view of a surge tank of the present invention;
FIG. 8 is a second cross-sectional view of the surge tank of the present invention;
FIG. 9 is a front view of a cushioning assembly of the present invention;
FIG. 10 is a block diagram of a cushioning assembly of the present invention;
FIG. 11 is a schematic view of the cushioning assembly of the present invention in motion;
description of main reference numerals:
In the figure, 1, a buffer tank, 101, a spiral pipeline, 102, a buffer assembly, 1021, a buffer plate, 1022, a second spring, 1023, a supporting rod, 1024, a sleeve, 1025, a transition plate, 1026, a base, 1027, a limiting frame, 2, an induced draft fan, 3, a condensing unit, 401, a first activated carbon tank, 402, a second activated carbon tank, 5, a vacuum pump, 6, a gas mixer, 7, a fan, 8, a regenerative oxidation furnace, 9, a mixer, 10, a bypass valve, 11, a hydraulic cylinder, 12, an auxiliary frame, 13, a limiting block, 14, an upper cover, 15, a recovery box, 1501, a cleaning frame, 1502, a guide rail, 1503, a supporting block, 1504, a first spring, 1505, a first fixed block, 16, a connecting block, 17, a separating plate, 1701, a second fixed block, 18, a cleaning brush, 19, a first limiting frame, 20 and a filter screen are shown.
Detailed Description
In order to further illustrate the technical means and effects adopted by the present invention for achieving the intended purpose, the following description of the specific embodiments, structures, features and effects according to the present invention will be clearly and completely described with reference to the accompanying drawings and preferred embodiments, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present application, it should be understood that the orientation or positional relationship indicated as belonging to "inner", "outer", etc. is the orientation or position described based on the drawings, and is merely for convenience of describing the present application and simplifying the description, and does not indicate or imply that the apparatus or element to be referred to must have a specific orientation, a specific orientation configuration and operation, and thus should not be construed as limiting the present application.
Referring to fig. 1 to 10, the organic waste gas recovery and treatment system disclosed by the invention comprises a buffer tank 1, a condensation system, a PSA adsorption system and a treatment system, wherein the condensation system comprises an induced draft fan 2 and a condensation unit 3, a first inlet of the buffer tank 1 is connected with a sample injection pipeline, a first outlet of the buffer tank 1 is connected with a first inlet pipeline of the condensation unit 3, an induced draft fan 2 is arranged in a pipeline connected with the condensation unit 3 by the buffer tank 1, and a pressure transmitter is arranged on an inlet pipeline of the induced draft fan 2;
The PSA adsorption system comprises a first active carbon tank 401, a second active carbon tank 402 and a vacuum pump 5, the treatment system comprises a gas mixer 6, a fan 7, a regenerative oxidation furnace 8, a mixer 9 and a bypass valve 10, the outlet of a condensing unit is connected with the lower inlet of the first active carbon tank 401 and the lower inlet pipeline of the second active carbon tank 402, the top outlet of the first active carbon tank 401 and the top outlet of the second active carbon tank 402 are connected with the gas mixer 6, the gas mixer 6 is used for mixing organic waste gas and air, the oxygen content in the organic waste gas is increased, the subsequent treatment is convenient, the upper inlet pipeline of the regenerative oxidation furnace 8 is connected with a burner, an oxidation chamber, a plurality of groups of regenerative chambers and a plurality of groups of lower chambers are arranged in the regenerative oxidation furnace 8, ceramic fillers are arranged in the plurality of groups of regenerative chambers, the gas mixer 6 is connected with the lower inlets of the plurality of groups of lower chambers of the regenerative oxidation furnace 8 through pipelines, a fan 7 is arranged in the pipeline connecting the gas mixer 6 with the lower inlets of the plurality of groups of lower chambers of the regenerative oxidation furnace 8, the upper outlet of the regenerative oxidation furnace 8 is connected with the upper inlet pipeline of the mixer 9, a bypass valve 10 is arranged in the pipeline connecting the upper outlet of the regenerative oxidation furnace 8 with the upper inlet of the mixer 9, the lower outlet of the regenerative oxidation furnace 8 is connected with the lower inlet pipeline of the mixer 9, the outlet of the mixer 9 is connected with a gas discharge pipeline, the upper part of the mixer 9 is provided with cooling liquid, and the pipeline connecting the regenerative oxidation furnace 8 and the mixer 9 is convenient for switching tail gas discharge through the indoor temperature of the regenerative oxidation furnace 8 in a matched manner, so that high-temperature tail gas is prevented from being directly discharged into air.
Referring to fig. 1, the condensing unit 3 includes a first-stage evaporator, a second-stage evaporator, a third-stage evaporator, an oil tank, a supercooling exchanger, and a precooler, an outlet of the oil tank is connected to a second inlet pipe of the buffer tank 1, and a second inlet of the condensing unit 3 is connected to a second air supply pipe.
Referring to fig. 1, a first active carbon tank 401 and a second active carbon tank 402 are disposed in parallel, a first air supply pipe is connected to a top inlet of the first active carbon tank 401 and a top inlet of the second active carbon tank 402, a cooling water pipe is disposed at one side of the first active carbon tank 401, a cooling water pipe is disposed at one side of the second active carbon tank 402, a lower outlet of the first active carbon tank 401 and a lower outlet of the second active carbon tank 402 are connected to a third inlet pipe of the buffer tank 1, and a vacuum pump 5 is disposed in a pipe in which a lower outlet of the first active carbon tank 401 and a lower outlet of the second active carbon tank 402 are connected to the third inlet of the buffer tank 1.
Through setting up condensing unit 3, make the component that has stronger volatility in the organic waste gas before the oxidation treatment, carry out recovery processing through condensing unit 3 preferentially, progressively reduce oil gas temperature through setting up tertiary continuous cooling, can be the liquid with the different component fractional condensation in the organic waste gas to the maximum, improve recovery efficiency, reduce the wasting of resources, practice thrift the cost, improve economic benefits.
Through retrieving the partial component of organic waste gas, make the concentration of organic waste gas reduce in the follow-up adsorption treatment, and let in nitrogen gas and vacuum pump 5 cooperation in to the active carbon jar through first gas supply pipeline, can carry out the vacuum desorption to the active carbon in the active carbon jar, make the active carbon jar can reuse, reduce the frequency and the risk of shutoff that active carbon adsorbent changed, and the operation load of follow-up equipment, further improve the treatment effeciency of waste gas, two active carbon jars are parallelly connected, be convenient for switch the use, can guarantee that the whole system can not be because of active carbon adsorption reaches saturated state and makes waste gas treatment work stop when carrying out waste gas recovery treatment work, guarantee treatment efficiency.
By arranging the condensing system and the treatment system, the condensing unit 3, the first activated carbon tank 401, the second activated carbon tank 402 and the regenerative oxidation furnace 8 are combined, so that the beneficial components in the organic waste gas can be recovered with maximum efficiency, and the treatment efficiency is improved.
Referring to fig. 2 to 6, be provided with filter component and cleaning component in the sampling pipeline, filter component includes first spacing 19 and filter screen 20, first spacing 19 fixed connection is in the inner wall of sampling pipeline, be convenient for carry out spacing and fixed to filter screen 20, filter screen 20 sliding connection is in first spacing 19, the top fixedly connected with upper cover 14 of filter screen 20, cleaning component includes pneumatic cylinder 11, auxiliary frame 12 and cleaning brush 18, pneumatic cylinder 11 fixed connection is in cleaning brush 18, auxiliary frame 12 fixed connection is in cleaning brush 18, improve the stability of cleaning brush 18 when carrying out the up-and-down motion, the position of cleaning brush 18 corresponds with the position of filter screen 20, the top of sampling pipeline is provided with stopper 13, the through-hole has been seted up on the stopper 13, auxiliary frame 12 runs through the through-hole sliding connection of stopper 13 in stopper 13, through setting up filter screen 20, particulate matter in the prefiltering organic waste gas, improve subsequent treatment efficiency, be convenient for clean filter screen 20's frequency through setting up cleaning brush 18, can reduce filter screen 20's frequency, and processing cost is reduced.
Referring to fig. 2 to 6, a recovery assembly is disposed below the filter screen 20, the recovery assembly is detachably connected below the sample injection pipeline, cleaning and maintenance are facilitated, the recovery assembly comprises a recovery box 15, a connection block 16 and a separation plate 17, the connection block 16 is in a T-shaped arrangement, the connection block 16 is fixedly connected to the sample injection pipeline, the separation plate 17 is rotatably connected to the connection block 16 through a second fixing block 1701 and a pin, the separation plate 17 is in a Z-shaped arrangement, and the separation plate 17 is matched with the connection block 16.
Referring to fig. 3, 5 and 6, the inside transmission subassembly that is provided with cleaning frame 1501 and two sets of symmetries of collection box 15, transmission subassembly includes guide rail 1502, supporting shoe 1503, first spring 1504 and first fixed block 1505, cleaning frame 1501 fixed connection is in one side of collection box 15, the position of cleaning frame 1501 corresponds with the position of cleaning brush 18, be convenient for clean cleaning brush 18 when cleaning brush 18 sweeps the impurity on filter screen 20 into collection box 15, avoid impurity to pile up on cleaning brush 18, result in cleaning brush 18 to the efficiency reduction when filter screen 20 cleans, guide rail 1502 fixed connection is in collection box 15, guide rail 1502 is the arc setting, the arc recess has been seted up along the outer wall shape on the guide rail 1502.
Referring to fig. 3 to 6, a first fixing block 1505 is fixedly connected to one side of a groove of a guide rail 1502, a first spring 1504 is disposed at the groove of the guide rail 1502, the first spring 1504 is matched with the groove of the guide rail 1502, one side of the first spring 1504 is fixedly connected to the first fixing block 1505, the other side of the first spring 1504 is fixedly connected to a supporting block 1503, a protruding section matched with the supporting block 1503 is disposed at the groove of the guide rail 1502, the supporting block 1503 is slidably connected to the guide rail 1502 through the protruding section, and a through hole matched with the guide rail 1502 is formed in a partition plate 17.
The supporting block 1503 plays a supporting role on the isolation plate 17 when the isolation plate 17 is in a horizontal state, when the cleaning brush 18 moves downwards to push the isolation plate 17, the isolation plate 17 drives the supporting block 1503 and the first spring 1504 to move along the guide rail 1502, so that the recovery box 15 is in a door opening state, impurities are conveniently swept into the recovery box 15 by the cleaning brush 18, when the cleaning brush 18 moves upwards to the outside of the recovery box 15, the first spring 1504 drives the supporting block 1503 to move along the guide rail 1502 to reset, so that the recovery box 15 is in a door closing state, and the phenomenon that the impurities in the recovery box 15 are brought up when organic waste gas is introduced into a sample introduction pipeline is avoided, so that the normal filtration of the organic waste gas is influenced.
Referring to fig. 7 to 11, the buffer tank 1 is internally provided with a spiral pipe 101 and an inner cylinder, a buffer assembly 102 is arranged in the inner cylinder, the buffer assembly 102 comprises a buffer plate 1021, a second spring 1022, a stay 1023, a sleeve 1024, a transition plate 1025, a base 1026 and a limiting frame 1027, the limiting frame 1027 is in an annular arrangement, the limiting frame 1027 is fixedly connected to the inner wall of the inner cylinder, the buffer plate 1021 is arranged on the inner side of the limiting frame 1027, the buffer plate 1021 is in sliding connection with the limiting frame 1027, and a sealing layer is arranged between the buffer plate 1021 and the limiting frame 1027 to ensure air tightness.
Referring to fig. 7 to 11, a circle of protruding limiting sections are provided at the bottom of the limiting frame 1027, a plurality of through holes are provided on the buffer plate 1021, a plurality of supporting rods 1023 are provided, a plurality of supporting rods 1023 are fixedly connected to the lower portion of the buffer plate 1021, a sleeve 1024 is fixedly connected to the lower portion of the supporting rods 1023, a damping layer is provided at the portion of the sleeve 1024 connected to the supporting rods 1023, a second spring 1022 is sleeved on the supporting rods 1023, a transition plate 1025 is fixedly connected to the lower portion of the sleeve 1024, and a base 1026 is fixedly connected to the lower portion of the transition plate 1025.
When organic waste gas is introduced, the buffer plate 1021, the second springs 1022, the supporting rods 1023 and the sleeve 1024 are matched with each other to move along the limiting frame 1027 in the vertical direction, so that buffer force is provided, pressure fluctuation of the organic waste gas is balanced, and impact force received by subsequent waste gas treatment equipment is reduced.
An organic waste gas recovery treatment method comprises the following steps:
Treatment of organic waste gas:
S1, introducing organic waste gas into a sample introduction pipeline, filtering the organic waste gas, intercepting particulate matters in the organic waste gas, introducing the filtered organic waste gas into a buffer tank 1 for buffering, and balancing the pressure fluctuation of the organic waste gas;
S2, introducing the buffered organic waste gas into a condensing unit 3 through an induced air fan 2 for condensation treatment, pre-cooling the organic waste gas by a precooler, introducing a first-stage evaporator to cool the organic waste gas to 0-5 ℃, removing most of water vapor and high-boiling-point organic waste gas components to obtain condensate A, introducing a second-stage evaporator to cool the organic waste gas which is not condensed at the first stage to-20 to-30 ℃ to separate out residual water vapor and medium-boiling-point organic waste gas components to obtain condensate B, introducing the organic waste gas components which are not condensed at the second-stage evaporator to-55 to-70 ℃ to further separate out medium-low-boiling-point components to obtain condensate C, and introducing the organic waste gas which is subjected to multi-stage condensation treatment into a supercooling exchanger to exchange heat with the precooler to enable the temperature of the organic waste gas to rise to 0-25 ℃ to obtain low-concentration organic waste gas;
s3, introducing condensate A, condensate B and condensate C into an oil storage tank for recovery, introducing low-concentration organic waste gas into a first active carbon tank 401 for adsorption treatment, automatically cutting the system into a second active carbon tank 402 for adsorption treatment of the low-concentration organic waste gas after the first active carbon tank 401 is saturated in adsorption, and simultaneously, carrying out desorption treatment on the first active carbon tank 401 to obtain organic waste gas A after the adsorption treatment;
S4, introducing the organic waste gas A and air into a heat accumulating type oxidation furnace 8 through a gas mixer 6 and a fan 7 for oxidative decomposition treatment, preheating the organic waste gas A in a group of heat accumulating chambers, then heating the organic waste gas A to 760-850 ℃ in an oxidation chamber, and oxidizing and decomposing organic components in the organic waste gas A to obtain high-temperature tail gas;
S5, introducing high-temperature tail gas into another group of regenerators, performing heat exchange and cooling with ceramic packing in the regenerators to obtain tail gas, wherein the tail gas is low-temperature tail gas, the heat accumulation energy of the ceramic packing is used for preheating the waste gas in the next period, when the indoor temperature of the oxidation chamber of the regenerative oxidation furnace 8 is in a set temperature range, the bypass valve 10 is closed, the tail gas is directly discharged through a gas discharge pipeline after being introduced into the mixer 9 through the regenerators performing heat exchange, when the indoor temperature of the oxidation chamber of the regenerative oxidation furnace 8 is higher than the set temperature range, the bypass valve 10 is opened, and the tail gas is the low-temperature tail gas after being oxidized and the high-temperature tail gas after being oxidized and the low-temperature tail gas after being subjected to heat exchange with the ceramic packing, and is introduced into the mixer 9 through the bypass valve 10 for mixed cooling and then discharged through the gas discharge pipeline;
The active carbon tank is reused:
And S6, after the first activated carbon tank 401 is adsorbed and saturated, nitrogen is introduced into the first activated carbon tank 401 through a first air supply pipeline, the vacuum pump 5 is started, the pressure of an activated carbon bed of the first activated carbon tank 401 is reduced by vacuum desorption of the first activated carbon tank 401 through the vacuum pump 5, organic waste gas components adsorbed in the activated carbon are separated from a pore structure of the activated carbon, and the organic waste gas components are conveyed back to the buffer tank 1 from the first activated carbon tank 401 for subsequent treatment and recovery, so that the first activated carbon tank 401 can be continuously used.
The working principle and the use flow of the invention are that organic waste gas is introduced into a sample injection pipeline, particles in the organic waste gas are intercepted by a filter screen 20, the organic waste gas enters a buffer tank 1, the organic waste gas enters an inner cylinder along a spiral pipeline 101 and passes through a buffer plate 1021, after the buffer plate 1021 is impacted by air pressure, the buffer plate 1021, a second spring 1022, a supporting rod 1023 and a sleeve 1024 are mutually matched to move in the vertical direction along a limiting frame 1027, so as to provide buffer force, balance the pressure fluctuation of the organic waste gas and reduce the impact force suffered by subsequent waste gas treatment equipment.
When the filter screen 20 needs cleaning, the hydraulic cylinder 11 is started, the hydraulic cylinder 11 drives the auxiliary frame 12 and the cleaning brush 18 to move in the vertical direction to clean the filter screen 20, the hydraulic cylinder 11 is controlled to continuously move downwards, the cleaning brush 18 continuously moves downwards to drive the isolation plate 17 to overturn downwards after moving to the isolation plate 17, at the moment, the isolation plate 17 drives the supporting block 1503 and the first spring 1504 to move along the guide rail 1502, the recovery box 15 is in a door opening state, the cleaning brush 18 pushes impurities cleaned from the filter screen 20 into the recovery box 15, and the impurities on the cleaning brush 18 are also cleaned into the recovery box 15 when the cleaning brush 18 moves downwards to pass through the cleaning frame 1501.
When the filter screen 20 needs to be replaced, the upper cover 14 is pulled to draw the filter screen 20 out of the first limiting frame 19 for replacement.
The present invention is not limited in any way by the above-described preferred embodiments, but is not limited to the above-described preferred embodiments, and any person skilled in the art will appreciate that the present invention can be embodied in the form of a program for carrying out the method of the present invention, while the above disclosure may be used to make various changes or modifications to the equivalent embodiments, any brief description of the modification, equivalent variation and modification of the above embodiments according to the technical principles of the present invention will still fall within the scope of the technical aspects of the present invention.
Claims (10)
1. The organic waste gas recovery treatment system is characterized by comprising a buffer tank (1), a condensation system, a PSA adsorption system and a treatment system, wherein the condensation system comprises an induced draft fan (2) and a condensation unit (3), a first inlet of the buffer tank (1) is connected with a sample injection pipeline, a first outlet of the buffer tank (1) is connected with a first inlet pipeline of the condensation unit (3), the induced draft fan (2) is arranged in a pipeline connected with the condensation unit (3) of the buffer tank (1), and a pressure transmitter is arranged on an inlet pipeline of the induced draft fan (2);
The PSA adsorption system comprises a first active carbon tank (401), a second active carbon tank (402) and a vacuum pump (5), the treatment system comprises a gas mixer (6), a fan (7), a regenerative oxidation furnace (8), a mixer (9) and a bypass valve (10), the outlet of the condensing unit is connected with the lower inlet of the first active carbon tank (401) and the lower inlet pipeline of the second active carbon tank (402), the top outlet of the first active carbon tank (401) and the top outlet of the second active carbon tank (402) are connected with the gas mixer (6) pipeline, the upper inlet pipeline of the regenerative oxidation furnace (8) is connected with a burner, a plurality of groups of hot room and a plurality of groups of lower chamber are arranged in the regenerative oxidation furnace (8), the gas mixer (6) is connected with the lower inlet pipeline of the lower chamber of the regenerative oxidation furnace (8), the gas mixer (6) is connected with the lower inlet pipeline of the regenerative oxidation furnace (8), the upper inlet pipeline of the regenerative oxidation furnace (8) is connected with the upper inlet pipeline of the regenerative oxidation furnace (8), the lower outlet of the regenerative oxidation furnace (8) is connected with the lower inlet pipeline of the mixer (9), and the outlet of the mixer (9) is connected with a gas discharge pipeline.
2. The organic waste gas recovery and treatment system according to claim 1, wherein the condensing unit (3) comprises a first-stage evaporator, a second-stage evaporator, a third-stage evaporator, an oil storage tank, a supercooling exchanger and a precooler, an outlet of the oil storage tank is connected with a second inlet pipeline of the buffer tank (1), and a second inlet of the condensing unit (3) is connected with a second air supply pipeline.
3. The organic waste gas recycling system according to claim 1, wherein the first active carbon tank (401) and the second active carbon tank (402) are arranged in parallel, a first air supply pipeline is connected with a top inlet of the first active carbon tank (401) and a top inlet of the second active carbon tank (402), a cooling water pipeline is arranged on one side of the first active carbon tank (401), a cooling water pipeline is arranged on one side of the second active carbon tank (402), a lower outlet of the first active carbon tank (401) and a lower outlet of the second active carbon tank (402) are connected with a third inlet pipeline of the buffer tank (1), and the vacuum pump (5) is arranged in a pipeline in which the lower outlet of the first active carbon tank (401) and the lower outlet of the second active carbon tank (402) are connected with the third inlet of the buffer tank (1).
4. The organic waste gas recycling system according to claim 1, wherein the sample injection pipeline is provided with a filtering component and a cleaning component, the filtering component comprises a first limiting frame (19) and a filter screen (20), the first limiting frame (19) is fixedly connected to the inner wall of the sample injection pipeline, the filter screen (20) is slidably connected to the first limiting frame (19), the top of the filter screen (20) is fixedly connected with an upper cover (14), the cleaning component comprises a hydraulic cylinder (11), an auxiliary frame (12) and a cleaning brush (18), the hydraulic cylinder (11) is fixedly connected to the cleaning brush (18), the auxiliary frame (12) is fixedly connected to the cleaning brush (18), the position of the cleaning brush (18) corresponds to the position of the filter screen (20), a limiting block (13) is arranged above the sample injection pipeline, a through hole is formed in the limiting block (13), and the auxiliary frame (12) penetrates through the through hole of the limiting block (13) and is slidably connected to the limiting block (13).
5. The organic waste gas recycling system according to claim 4, wherein a recycling component is arranged below the filter screen (20), the recycling component is detachably connected below the sample injection pipeline, the recycling component comprises a recycling box (15), a connecting block (16) and a separation plate (17), the connecting block (16) is in a T-shaped arrangement, the connecting block (16) is fixedly connected to the sample injection pipeline, the separation plate (17) is rotatably connected to the connecting block (16) through a second fixing block (1701) and a pin, the separation plate (17) is in a Z-shaped arrangement, and the separation plate (17) is matched with the connecting block (16).
6. The organic waste gas recycling system according to claim 5, wherein a cleaning frame (1501) and two groups of symmetrically arranged transmission components are arranged inside the recycling box (15), the transmission components comprise a guide rail (1502), a supporting block (1503), a first spring (1504) and a first fixing block (1505), the cleaning frame (1501) is fixedly connected to one side of the recycling box (15), the position of the cleaning frame (1501) corresponds to the position of the cleaning brush (18), the guide rail (1502) is fixedly connected to the recycling box (15), the guide rail (1502) is in an arc shape, and an arc-shaped groove is formed in the guide rail (1502) along the shape of the outer wall.
7. The organic waste gas recycling system according to claim 6, wherein the first fixing block (1505) is fixedly connected to one side of the groove of the guide rail (1502), the first spring (1504) is arranged at the groove of the guide rail (1502), the first spring (1504) is matched with the groove of the guide rail (1502), one side of the first spring (1504) is fixedly connected to the first fixing block (1505), the other side of the first spring (1504) is fixedly connected to the supporting block (1503), a protruding section matched with the supporting block (1503) is arranged at the groove of the guide rail (1502), the supporting block (1503) is slidably connected to the guide rail (1502) through the protruding section, and a through hole matched with the guide rail (1502) is formed in the isolation plate (17).
8. The organic waste gas recycling system according to claim 1, wherein a spiral pipeline (101) and an inner cylinder are arranged in the buffer tank (1), a buffer assembly (102) is arranged in the inner cylinder, the buffer assembly (102) comprises a buffer plate (1021), a second spring (1022), a supporting rod (1023), a sleeve (1024), a transition plate (1025), a base (1026) and a limiting frame (1027), the limiting frame (1027) is in an annular arrangement, the limiting frame (1027) is fixedly connected to the inner wall of the inner cylinder, the buffer plate (1021) is arranged on the inner side of the limiting frame (1027), the buffer plate (1021) is connected to the limiting frame (1027) in a sliding mode, and a sealing layer is arranged between the buffer plate (1021) and the limiting frame (1027).
9. The organic waste gas recycling system according to claim 8, wherein a circle of protruding limiting sections are arranged at the bottom of the limiting frame (1027), a plurality of through holes are formed in the buffer plate (1021), a plurality of supporting rods (1023) are arranged and fixedly connected to the lower portion of the buffer plate (1021), the lower portion of each supporting rod (1023) is fixedly connected with the corresponding sleeve (1024), a damping layer is arranged on the portion, connected with the corresponding supporting rod (1023), of each sleeve (1024), the corresponding second spring (1022) is sleeved on the corresponding supporting rod (1023), the corresponding transition plate (1025) is fixedly connected to the lower portion of the corresponding sleeve (1024), and the corresponding base (1026) is fixedly connected to the lower portion of the corresponding transition plate (1025).
10. An organic waste gas recovery treatment method based on the organic waste gas recovery treatment system of any one of claims 1 to 9, comprising the steps of:
Treatment of organic waste gas:
S1, introducing organic waste gas into a sample injection pipeline, filtering the organic waste gas, intercepting particulate matters in the organic waste gas, introducing the filtered organic waste gas into a buffer tank (1) for buffering, and balancing the pressure fluctuation of the organic waste gas;
S2, introducing the buffered organic waste gas into a condensing unit (3) through an induced air fan (2) for condensation treatment, pre-cooling the organic waste gas by a precooler, introducing a first-stage evaporator for cooling the organic waste gas to 0-5 ℃, removing most of water vapor and high-boiling-point organic waste gas components to obtain condensate A, introducing a second-stage evaporator for cooling the organic waste gas which is not condensed at the first stage to-20 to-30 ℃, separating out residual water vapor and medium-boiling-point organic waste gas components to obtain condensate B, introducing the organic waste gas components which are not condensed at the second-stage evaporator for cooling to-55 to-70 ℃, further separating out medium-low-boiling-point components to obtain condensate C, introducing the organic waste gas after the multi-stage condensation treatment into a supercooling exchanger and a precooler for heat exchange, and raising the temperature of the organic waste gas to 0-25 ℃ to obtain low-concentration organic waste gas;
S3, introducing condensate A, condensate B and condensate C into an oil storage tank for recycling, introducing low-concentration organic waste gas into a first active carbon tank (401) for adsorption treatment, automatically cutting the system into a second active carbon tank (402) for adsorption treatment of the low-concentration organic waste gas after the first active carbon tank (401) is saturated in adsorption, and simultaneously carrying out desorption treatment on the first active carbon tank (401) to obtain organic waste gas A after the adsorption treatment;
s4, introducing the organic waste gas A and air into a heat accumulating type oxidation furnace (8) through a gas mixer (6) and a fan (7) for oxidative decomposition treatment, preheating the organic waste gas A in a group of heat accumulating chambers, then heating the organic waste gas A in an oxidation chamber to 760-850 ℃, and oxidizing and decomposing organic components in the organic waste gas A to obtain high-temperature tail gas;
S5, introducing high-temperature tail gas into the other group of regenerators, performing heat exchange and cooling with ceramic filler in the regenerators to obtain tail gas, closing a bypass valve (10) when the indoor temperature of an oxidation chamber of a regenerative oxidation furnace (8) is in a set temperature range, introducing the tail gas into a mixer (9) through the regenerators performing heat exchange, directly discharging the tail gas through a gas discharge pipeline, and opening the bypass valve (10) when the indoor temperature of the oxidation chamber of the regenerative oxidation furnace (8) is higher than the set temperature range, introducing the tail gas into the mixer (9) through the bypass valve (10) for mixing and cooling, and discharging the tail gas through the gas discharge pipeline;
The active carbon tank is reused:
S6, after the first activated carbon tank (401) is adsorbed and saturated, nitrogen is introduced into the first activated carbon tank (401) through a first air supply pipeline, a vacuum pump (5) is started, the pressure of an activated carbon bed of the first activated carbon tank (401) is reduced by vacuum desorption of the vacuum pump (5), organic waste gas components adsorbed in the activated carbon are separated from a pore structure of the activated carbon, and the organic waste gas components are conveyed back to the buffer tank (1) from the first activated carbon tank (401) for subsequent treatment and recovery, so that the first activated carbon tank (401) can be continuously used.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102764564A (en) * | 2012-07-27 | 2012-11-07 | 海湾环境科技（北京）股份有限公司 | Waste gas recovery processing system, and recovery processing technique of waste gas |
| CN211963401U (en) * | 2020-04-15 | 2020-11-20 | 古县正泰煤气化有限公司 | Waste gas treatment device for coke oven |
| CN214862025U (en) * | 2021-07-01 | 2021-11-26 | 无锡市长虹化塑色粒有限公司 | Waste gas treatment equipment is used in plastic master batch production |
| CN219607321U (en) * | 2023-05-06 | 2023-08-29 | 上海顺外建设工程有限公司 | Clean filter equipment |
| CN220648237U (en) * | 2023-06-26 | 2024-03-22 | 浙江物产环能浦江热电有限公司 | Anti-wear anti-blocking high-temperature-resistant device for CFB boiler return ash discharge pipe |
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2025
- 2025-02-07 CN CN202510134136.XA patent/CN119548940A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102764564A (en) * | 2012-07-27 | 2012-11-07 | 海湾环境科技（北京）股份有限公司 | Waste gas recovery processing system, and recovery processing technique of waste gas |
| CN211963401U (en) * | 2020-04-15 | 2020-11-20 | 古县正泰煤气化有限公司 | Waste gas treatment device for coke oven |
| CN214862025U (en) * | 2021-07-01 | 2021-11-26 | 无锡市长虹化塑色粒有限公司 | Waste gas treatment equipment is used in plastic master batch production |
| CN219607321U (en) * | 2023-05-06 | 2023-08-29 | 上海顺外建设工程有限公司 | Clean filter equipment |
| CN220648237U (en) * | 2023-06-26 | 2024-03-22 | 浙江物产环能浦江热电有限公司 | Anti-wear anti-blocking high-temperature-resistant device for CFB boiler return ash discharge pipe |
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