CN116726639A - Waste gas treatment method and treatment device based on high-temperature rotary furnace - Google Patents
Waste gas treatment method and treatment device based on high-temperature rotary furnace Download PDFInfo
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- CN116726639A CN116726639A CN202311006266.2A CN202311006266A CN116726639A CN 116726639 A CN116726639 A CN 116726639A CN 202311006266 A CN202311006266 A CN 202311006266A CN 116726639 A CN116726639 A CN 116726639A
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- waste gas
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- exhaust gas
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- 239000002912 waste gas Substances 0.000 title claims abstract description 150
- 238000000034 method Methods 0.000 title claims abstract description 9
- 239000007789 gas Substances 0.000 claims abstract description 192
- 238000012216 screening Methods 0.000 claims abstract description 63
- 239000012495 reaction gas Substances 0.000 claims abstract description 55
- 239000000126 substance Substances 0.000 claims abstract description 40
- 238000004062 sedimentation Methods 0.000 claims abstract description 21
- 239000007788 liquid Substances 0.000 claims description 75
- 238000006243 chemical reaction Methods 0.000 claims description 43
- 238000007789 sealing Methods 0.000 claims description 32
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 31
- 230000001681 protective effect Effects 0.000 claims description 8
- 230000001939 inductive effect Effects 0.000 claims description 6
- 239000010812 mixed waste Substances 0.000 claims description 3
- 238000005086 pumping Methods 0.000 claims description 3
- 239000012535 impurity Substances 0.000 abstract description 16
- 239000004519 grease Substances 0.000 abstract description 10
- 208000028659 discharge Diseases 0.000 abstract description 5
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 239000002699 waste material Substances 0.000 abstract description 3
- 230000004888 barrier function Effects 0.000 description 7
- 238000004891 communication Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 238000001514 detection method Methods 0.000 description 4
- 238000004064 recycling Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 238000001179 sorption measurement Methods 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 239000013065 commercial product Substances 0.000 description 2
- 125000004122 cyclic group Chemical group 0.000 description 2
- 239000003814 drug Substances 0.000 description 2
- 239000013043 chemical agent Substances 0.000 description 1
- 238000012993 chemical processing Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000000376 reactant Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D50/00—Combinations of methods or devices for separating particles from gases or vapours
- B01D50/10—Combinations of devices covered by groups B01D45/00, B01D46/00 and B01D47/00
-
- 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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/008—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases cleaning gases
Abstract
The invention discloses a waste gas treatment method and a treatment device based on a high-temperature rotary furnace, which relate to the technical field of furnace and kiln accessories and comprise the following steps: the physical treatment device is used for carrying out physical sedimentation on the waste gas; the waste gas screening device is used for screening the waste gas after the particulate matters are removed by physical sedimentation; when the total content of the reaction gas and the shielding gas in the waste gas is not less than 30%, the waste gas enters the rotary furnace through the waste gas screening device; at lower levels, the exhaust gas enters the chemical treatment unit via the exhaust gas screening unit. According to the invention, the physical treatment device is used for carrying out physical sedimentation on the waste gas firstly, and the physical treatment device can be used for effectively reducing the impurity content of grease, particulate matters and the like in the waste gas no matter the subsequent waste gas is used for reutilization or chemical treatment. The waste gas screening device can effectively save the equipment volume, and the single equipment is adopted to realize the circulation and direct waste discharge treatment of waste gas. The chemical treatment device does not need to be normally open, and can play roles in reducing energy consumption and production cost.
Description
Technical Field
The invention relates to the technical field of furnace and kiln accessories, in particular to a waste gas treatment method and a treatment device based on a high-temperature rotary furnace.
Background
When the rotary furnace works, according to different application scenes and different materials in the furnace, reaction gas and protective gas are sometimes required to be filled into the furnace, the tail gas treatment system of the conventional rotary furnace adopts physical filtration, for example, in China patent with the application number of CN202010317037, a method related to the physical filtration of hot dirty gas is introduced, in the working scene of the rotary furnace requiring filling gas, as the filling gas is required, how to improve the recycling rate of the filling gas is also the technical problem to be solved by the conventional rotary furnace, the flow direction of waste gas is usually controlled by adopting double valves, and different pipelines, different valves and different sensors are required to be controlled for the flow direction of the waste gas, so that the whole structure and applicable equipment are relatively complex, and therefore, how to realize cyclic utilization of the waste gas under a relatively simple structure, reduce pipeline erection and simplify the equipment. Therefore, there is a need to propose a method and apparatus for treating exhaust gas based on a high temperature rotary kiln to at least partially solve the problems of the prior art.
Disclosure of Invention
In the summary, a series of concepts in a simplified form are introduced, which will be further described in detail in the detailed description. The summary of the invention is not intended to define the key features and essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter.
To at least partially solve the above problems, the present invention provides an exhaust gas treatment device based on a high temperature rotary kiln, comprising: the physical treatment device is used for communicating with the exhaust port of the rotary furnace and carrying out physical sedimentation on the exhaust gas;
the exhaust gas screening device is communicated with the exhaust port of the physical treatment device and is used for screening the exhaust gas after the particulate matters are removed by physical sedimentation;
when the total content of the reaction gas and the shielding gas in the waste gas is not less than 30%, the waste gas is mixed with the shielding gas and the reaction gas required by the reaction of the rotary furnace through the waste gas screening device, and enters the rotary furnace from the air inlet of the rotary furnace;
when the total content of the reaction gas and the protective gas in the waste gas is lower than 30%, the waste gas enters a chemical treatment device for waste gas treatment through the waste gas screening device and is discharged.
Preferably, the physical treatment device consists of a wet caisson and a dry caisson, wherein the air inlet end of the wet caisson is communicated with the air outlet of the rotary furnace, the air outlet end of the wet caisson is communicated with the air inlet end of the dry caisson, the wet caisson is filled with liquid, at least three rotary filter screens connected with the inner wall shaft of the wet caisson are arranged in the wet caisson, the rotary shaft of each rotary filter screen is positioned above the liquid level, and at least three air inducing grid baffles are arranged in the wet caisson;
the three rotary filter screens are respectively a first filter screen close to the air inlet end of the wet caisson, a third filter screen close to the air outlet end of the wet caisson and a second filter screen arranged between the first filter screen and the third filter screen, and the bottoms of the first filter screen and the third filter screen are positioned below the liquid level;
the three draft baffles are respectively positioned between the air inlet end of the wet caisson and the three rotary filter screens.
Preferably, the three air inducing grid baffles are first grid baffles which are respectively arranged at the top of the air inlet end of the wet caisson and extend towards the liquid level; the second grid is arranged at the inner top of the wet caisson and extends towards the liquid level, the second grid is positioned between the first filter screen and the second filter screen, and the distance between the first grid and the second grid is matched with the rotation diameter of the first filter screen; the third grid block is arranged at the bottom in the wet caisson and extends upwards to the outside of the liquid level, the third grid block is positioned between the second filter screen and the third filter screen, a gap is reserved between the top of the third grid block and the top of the wet caisson, through holes for communicating liquid on two sides are selectively formed in the bottom of the third grid block, and when the liquid levels on two sides of the third grid block are required to be level or only one liquid exists in the wet caisson, through holes for communicating the liquid on two sides are formed in the bottom of the third grid block; when different liquid levels are needed on the two sides of the third barrier, or different liquids are arranged on the two sides of the third barrier, no through holes are arranged.
Preferably, the dry caisson is a vertically arranged rectangular box body, the top of the dry caisson is a conical exhaust port with a small upper part and a large lower part and is communicated with the air inlet end of the waste gas screening device, the side wall of the dry caisson is provided with an air inlet communicated with the air outlet end of the wet caisson, and the air inlet is positioned above the liquid level in the wet caisson.
Preferably, the exhaust gas screening device comprises a multichannel tube in communication with a reactant gas supply, a shielding gas supply, and the chemical treatment device, respectively; and the double-way movable pipe is arranged on the multi-way pipeline and is movably connected with the multi-way pipeline through driving equipment, the reaction gas supply source and the shielding gas supply source are communicated with the double-way movable pipe through the multi-way pipeline, the chemical treatment device is selectively communicated with one exhaust end of the double-way movable pipe through the multi-way pipeline, the air inlet end of the double-way movable pipe is communicated with the air outlet of the physical treatment device, and the other exhaust end of the double-way movable pipe is positioned outside the multi-way pipeline and is communicated with the air inlet of the rotary furnace.
Preferably, the multi-channel pipeline is composed of an exhaust part through which exhaust gas flows and a mixing part for mixing gas, the two-channel movable pipe penetrates through the exhaust part and the mixing part, the exhaust part is communicated with the chemical treatment device through the side wall of the two-channel movable pipe, the reaction gas supply source and the shielding gas supply source are both communicated with the mixing part, the two-channel movable pipe is composed of an inner pipe and an outer pipe, the outer pipe is sleeved outside the inner pipe, a gap is reserved between the outer pipe and the inner pipe, a mixing gas channel is formed between the outer wall of the inner pipe and the inner wall of the outer pipe, the mixing gas channel extends to the outside of the mixing part and is communicated with the air inlet of the rotary furnace, an air hole positioned in the mixing part is arranged on the outer pipe, the mixing part is communicated with the mixing gas channel through the air hole, an exhaust gas flow through hole is arranged on the side wall of the inner pipe, the exhaust gas flow through hole is not communicated with the mixing gas channel, the exhaust gas flow through hole is selectively positioned in the exhaust part or the mixing part, and the air flow through hole is sealed between the outer pipe and the outer wall of the mixing part.
Preferably, the chemical treatment device is formed by connecting a plurality of module reaction boxes up and down, the bottom of the module reaction box positioned at the lowest is provided with a liquid storage box, the top of the module reaction box positioned at the highest is provided with a sealing cover, a circulating device is arranged in the liquid storage box and used for pumping liquid in the liquid storage box into the module reaction box positioned at the highest, and the exhaust end of the exhaust gas screening device penetrates through the liquid storage box and is communicated with the module reaction box positioned at the lowest.
Preferably, the module reaction box comprises a box body and a water fall device arranged in the box body, the water fall device comprises a baffle ring annularly arranged on the inner wall of the box body and a cylindrical sealing piece with a downward opening connected with the inner wall of the box body through a water bearing plate, the top of the sealing piece is circular, the top of the sealing piece and the baffle ring are positioned on the same horizontal plane, a gap is reserved between the circular outer wall of the top of the sealing piece and the inner wall of the baffle ring to form an annular water outlet, the bottom of the sealing piece extends to the lower side of the water bearing plate, a water outlet is reserved between the water bearing plate and the sealing piece, an exhaust hole is arranged on the side wall of the sealing piece, and the sealing piece of the module reaction box positioned at the lowest part is communicated with the exhaust end of the exhaust gas screening device.
Preferably, a gas guiding pipe is arranged on the side wall of the box body, the gas inlet end of the gas guiding pipe is located below the baffle ring, and the gas outlet end of the gas guiding pipe extends to the top of the sealing piece.
A waste gas treatment method of a waste gas treatment device based on a high-temperature rotary furnace comprises the following treatment steps:
s1: the waste gas after the reaction in the rotary furnace is sent to a physical treatment device through an exhaust port;
s2: the waste gas is subjected to physical sedimentation in a physical treatment device, and particulate matters in the waste gas are removed;
s3: the treated waste gas is sent into a waste gas screening device, and a sensor positioned in the waste gas screening device detects the waste gas components;
s4: if the total content of the reaction gas and the shielding gas in the waste gas is not less than 30%, the waste gas can be reused, and the waste gas can be mixed with the shielding gas provided by the shielding gas supply source and the reaction gas provided by the reaction gas supply source through the waste gas screening device, and the mixed waste gas is returned to the rotary furnace for reaction;
s4': if the total content of the reaction gas and the shielding gas in the waste gas is lower than 30 percent and cannot be reused, the waste gas enters a chemical treatment device through a waste gas screening device to be discharged after chemical treatment.
Compared with the prior art, the invention at least comprises the following beneficial effects:
according to the invention, the waste gas is diverted through the waste gas screening device, firstly, the waste gas enters the physical treatment device through the exhaust port of the rotary furnace, and is subjected to physical sedimentation in the physical treatment device, so that impurities such as grease, particulate matters and the like in the waste gas are removed, and the waste gas is prevented from entering the rotary furnace when being recycled.
The exhaust gas after physical sedimentation enters the exhaust gas screening device through the exhaust port, and a sensor is usually arranged in the exhaust gas screening device, and can be arranged at the exhaust port of the physical treatment device, so long as the sedimentation-type exhaust gas component can be detected, the component detection sensor is a commercial product or the prior art, the specific principle and model are not repeated (the sensor is unnecessary, can be detected manually and is adjusted manually), and although the sensor is used for detecting the exhaust gas component in the embodiment, the protection scope is not limited to the sensor for detecting the component.
In this case, two situations occur, namely, the content of the reaction gas and the shielding gas in the exhaust gas is higher as described in the step S4, and the reaction gas and the shielding gas can be reused in the rotary furnace, or the content of the reaction gas and the shielding gas in the exhaust gas is lower as described in the step S4', and the reaction gas and the shielding gas cannot be reused. And controlling the waste gas screening device according to the detection results of the sensor on the reaction gas and the shielding gas.
When the content of the reaction gas and the shielding gas in the waste gas is higher and the waste gas can be reused in the rotary furnace, the waste gas can flow back into the rotary furnace through the waste gas screening device, and the reaction gas and the shielding gas can be mixed with the waste gas in the waste gas screening device during the backflow, so that the reaction gas and the shielding gas in the waste gas are supplemented.
When the content of the reaction gas and the protective gas in the waste gas is low and the waste gas cannot be reused, the waste gas screening device can directly convey the waste gas to the chemical treatment device for chemical treatment and then discharge.
It should be noted that, how the sensor is connected with the waste gas screening device, the chemical treatment device and the like through the controller and controlled by the conventional technical means, and the sensor is not subject to the protection key of the present invention, so the specific principle, the corresponding structure and the model are not repeated.
According to the invention, the physical treatment device is used for carrying out physical sedimentation on the waste gas firstly, and the physical treatment device can be used for effectively reducing the impurity content of grease, particulate matters and the like in the waste gas no matter the subsequent waste gas is used for reutilization or chemical treatment. The waste gas screening device can effectively save the equipment volume, and the single equipment is adopted to realize the circulation and direct waste discharge treatment of waste gas. The chemical treatment device can be started as required without being normally opened, and can play roles in reducing energy consumption and production cost.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate the invention and together with the embodiments of the invention, serve to explain the invention. In the drawings:
fig. 1 is a schematic diagram of the communication relationship of the exhaust gas treatment device based on the high-temperature rotary furnace according to the present invention.
Fig. 2 is a cross-sectional view of a physical treatment device according to the present invention.
FIG. 3 is a schematic diagram showing the internal structure of the exhaust screening device for recycling exhaust gas in the present invention.
FIG. 4 is a schematic view showing the internal structure of the exhaust gas screening apparatus when the exhaust gas enters the chemical treatment apparatus according to the present invention.
FIG. 5 is a schematic diagram of a modular reaction chamber according to the present invention.
FIG. 6 is a schematic view showing a structure of a chemical processing apparatus according to the present invention in which two module reaction chambers are provided.
In the figure: 100 rotary furnace, 200 physical treatment device, 300 waste gas screening device, 400 chemical treatment device, 500 reaction gas supply source, 600 shielding gas supply source, 1 wet caisson, 11 first filter screen, 12 second filter screen, 13 third filter screen, 14 first grid, 15 second grid, 16 third grid, 2 dry caisson, 3 multichannel pipeline, 31 waste gas part, 32 mixing part, 4 double-way movable pipe, 41 inner pipe, 42 outer pipe, 43 mixed gas circuit, 44 air holes, 45 waste gas flow through hole, 5 module reaction box, 51 box, 52 baffle ring, 53 water bearing plate, 54 sealing piece and 55 gas guiding pipe.
Detailed Description
The present invention is described in further detail below with reference to the drawings and examples to enable those skilled in the art to practice the invention by referring to the description.
It will be understood that terms, such as "having," "including," and "comprising," as used herein, do not preclude the presence or addition of one or more other elements or groups thereof.
As shown in fig. 1 to 6, the present invention provides a method and apparatus for treating waste gas based on a high temperature rotary kiln, comprising: the physical treatment device is used for communicating with the exhaust port of the rotary furnace and carrying out physical sedimentation on the exhaust gas;
the exhaust gas screening device is communicated with the exhaust port of the physical treatment device and is used for screening the exhaust gas after the particulate matters are removed by physical sedimentation;
when the total content of the reaction gas and the shielding gas in the waste gas is not less than 30%, the waste gas is mixed with the shielding gas and the reaction gas required by the reaction of the rotary furnace through the waste gas screening device, and enters the rotary furnace from the air inlet of the rotary furnace;
when the total content of the reaction gas and the protective gas in the waste gas is lower than 30%, the waste gas enters a chemical treatment device for waste gas treatment through the waste gas screening device and is discharged.
The processing steps are as follows:
s1: the waste gas after the reaction in the rotary furnace is sent to a physical treatment device through an exhaust port;
s2: the waste gas is subjected to physical sedimentation in a physical treatment device, and particulate matters in the waste gas are removed;
s3: the treated waste gas is sent into a waste gas screening device, and a sensor positioned in the waste gas screening device detects the waste gas components;
s4: if the total content of the reaction gas and the shielding gas in the waste gas is not less than 30%, the waste gas can be reused, and the waste gas can be mixed with the shielding gas provided by the shielding gas supply source and the reaction gas provided by the reaction gas supply source through the waste gas screening device, and the mixed waste gas is returned to the rotary furnace for reaction;
s4': if the total content of the reaction gas and the shielding gas in the waste gas is lower than 30 percent and cannot be reused, the waste gas enters a chemical treatment device through a waste gas screening device to be discharged after chemical treatment.
The technical scheme has the working principle and beneficial effects that: according to the invention, the waste gas is diverted through the waste gas screening device, firstly, the waste gas enters the physical treatment device through the exhaust port of the rotary furnace, and is subjected to physical sedimentation in the physical treatment device, so that impurities such as grease, particulate matters and the like in the waste gas are removed, and the waste gas is prevented from entering the rotary furnace when being recycled.
The exhaust gas after physical sedimentation enters the exhaust gas screening device through the exhaust port, and a sensor is usually arranged in the exhaust gas screening device, and can be arranged at the exhaust port of the physical treatment device, so long as the sedimentation-type exhaust gas component can be detected, the component detection sensor is a commercial product or the prior art, the specific principle and model are not repeated (the sensor is unnecessary, can be detected manually and is adjusted manually), and although the sensor is used for detecting the exhaust gas component in the embodiment, the protection scope is not limited to the sensor for detecting the component.
In this case, two situations occur, namely, the content of the reaction gas and the shielding gas in the exhaust gas is higher as described in the step S4, and the reaction gas and the shielding gas can be reused in the rotary furnace, or the content of the reaction gas and the shielding gas in the exhaust gas is lower as described in the step S4', and the reaction gas and the shielding gas cannot be reused. And controlling the waste gas screening device according to the detection results of the sensor on the reaction gas and the shielding gas.
When the content of the reaction gas and the shielding gas in the waste gas is higher and the waste gas can be reused in the rotary furnace, the waste gas can flow back into the rotary furnace through the waste gas screening device, and the reaction gas and the shielding gas can be mixed with the waste gas in the waste gas screening device during the backflow, so that the reaction gas and the shielding gas in the waste gas are supplemented.
When the content of the reaction gas and the protective gas in the waste gas is low and the waste gas cannot be reused, the waste gas screening device can directly convey the waste gas to the chemical treatment device for chemical treatment and then discharge.
It should be noted that, how the sensor is connected with the waste gas screening device, the chemical treatment device and the like through the controller and controlled by the conventional technical means, and the sensor is not subject to the protection key of the present invention, so the specific principle, the corresponding structure and the model are not repeated.
According to the invention, the physical treatment device is used for carrying out physical sedimentation on the waste gas firstly, and the physical treatment device can be used for effectively reducing the impurity content of grease, particulate matters and the like in the waste gas no matter the subsequent waste gas is used for reutilization or chemical treatment. The waste gas screening device can effectively save the equipment volume, and the single equipment is adopted to realize the circulation and direct waste discharge treatment of waste gas. The chemical treatment device can be started as required without being normally opened, and can play roles in reducing energy consumption and production cost.
In order to further improve the treatment efficiency of physical sedimentation, the invention provides an embodiment with higher efficiency, which is different from the pure dry filtration with the patent number of CN202010317037, namely, the physical treatment device consists of a wet caisson 1 and a dry caisson 2, wherein the air inlet end of the wet caisson 1 is communicated with the air outlet of a rotary furnace, the air outlet end of the wet caisson 1 is communicated with the air inlet end of the dry caisson 2, the wet caisson 1 is filled with liquid, the filled liquid can be water or any liquid which can be attached to a rotary filter screen and has an adsorption effect on particles and grease, at least three rotary filter screens which are axially connected with the inner wall of the wet caisson 1 are arranged in the wet caisson 1, the rotary filter screens are in a cylindrical and multi-blade structure, and the rotary filter screens can be in a plurality of groups of blades are arranged on the rotary shafts along the radial direction, as shown in fig. 2 and can rotate under the pushing of waste gas entering the wet caisson 1. And at least three air inducing grid baffles;
the three rotary filter screens are respectively a first filter screen 11 close to the air inlet end of the wet caisson 1, a third filter screen 13 close to the air outlet end of the wet caisson 1 and a second filter screen 12 arranged between the first filter screen 11 and the third filter screen 13, wherein the bottoms of the first filter screen 11 and the third filter screen 13 are positioned below the liquid level; when the first filter screen 11 and the third filter screen 13 rotate, the fan blades on the first filter screen 11 and the third filter screen 13 can be submerged below the liquid level when rotating to the bottom, so that the effect of separating particles, grease and the like attached to the fan blades is achieved, and meanwhile when the fan blades leave the liquid level, the liquid is attached to the fan blades, so that the effect of reinforcing adsorption on the particles and the grease in the waste gas can be achieved.
The three draft baffles are respectively positioned between the air inlet end of the wet caisson 1 and the three rotary filter screens.
The three air inducing baffles are respectively arranged at the top of the air inlet end of the wet caisson 1, and are first baffles 14 extending towards the liquid level and used for guiding waste gas to blow downwards from the liquid level, so that the liquid level can absorb a part of impurities firstly; the second grid block 15 is arranged at the inner top of the wet caisson 1 and extends towards the liquid level, the second grid block 15 is positioned between the first filter screen 11 and the second filter screen 12, the distance between the first grid block 14 and the second grid block 15 is adapted to the rotation diameter of the first filter screen 11, and the first filter screen 11 is blown to rotate by the waste gas absorbed by the liquid level, so that the first filter screen 11 with the liquid on the surface can absorb impurities of the waste gas; the third check 16 is arranged at the inner bottom of the wet caisson 1 and extends upwards to the outside of the liquid level, the third check 16 is positioned between the second filter screen 12 and the third filter screen 13, waste gas is guided to flow through the second check 15 and still needs to flow from the liquid level to be settled, so that the waste gas can be blown to the second filter screen 12, the fan blades of the second filter screen 12 are not contacted with the liquid level, and impurities attached to the second filter screen 12 can fall off under the action of gravity after long-time rotation and adsorption. A gap is reserved between the top of the third grid 16 and the top of the wet caisson 1, so that the exhaust gas can be blown to the third filter screen 13, and the third filter screen 13 plays the same role as the first filter screen 11. The bottom of the third barrier 16 is selectively provided with through holes for communicating the liquid at two sides, and when the liquid levels at two sides of the third barrier 16 are required to be level or only one liquid exists in the wet caisson 1, the bottom of the third barrier 16 is provided with through holes for communicating the liquid at two sides; when different liquid levels are needed at two sides of the third barrier 16 or different liquids are needed at two sides of the third barrier 16, no through holes are arranged. Through the absorption of the liquid surface twice and the absorption of the rotary filter screen for three times, most of grease and particulate matters in the waste gas can be removed, and impurities which are not removed in the wet caisson 1 can enter the dry caisson 2 to continue sedimentation.
The dry caisson 2 is a vertically arranged rectangular box body 51, the top of the dry caisson 2 is a conical exhaust port with a small upper part and a large lower part, the conical exhaust port is communicated with the air inlet end of the waste gas screening device, the side wall of the dry caisson 2 is provided with an air inlet communicated with the air outlet end of the wet caisson 1, and the air inlet is positioned above the liquid level in the wet caisson 1. Because the exhaust gas is accompanied by moisture after passing through the wet caisson 1, after entering the dry caisson 2, the impurities with moisture impact on the conical inner top surface along with the sharply contracted flow area of the top, thereby performing dry sedimentation to further remove grease and impurities in the exhaust gas, and finally the impurities accumulated on the top of the dry caisson 2 fall into the bottom of the dry caisson 2 or accumulate downwards from the top.
To further simplify the apparatus, the present invention combines the conventional embodiment of direct connection of the reaction gas and the shielding gas to the rotary kiln with an exhaust gas screening device comprising a multi-path pipe 3 communicating with the reaction gas supply source, the shielding gas supply source and the chemical treatment device, respectively, to thereby reduce the number of pipes and optimize the apparatus layout; and a double-way movable tube 4 which is arranged on the multi-way pipeline 3 and is movably connected with the multi-way pipeline 3 through a driving device (which can be a motor drive, any existing device or technology capable of driving the double-way movable tube 4 to move) and is provided with a reaction gas supply source and a protective gas supply source which are communicated with the double-way movable tube 4 through the multi-way pipeline 3, wherein the chemical treatment device is selectively communicated with one exhaust end of the double-way movable tube 4 through the multi-way pipeline 3, the air inlet end of the double-way movable tube 4 is communicated with the air outlet of the physical treatment device, and the other exhaust end of the double-way movable tube 4 is positioned outside the multi-way pipeline 3 and is communicated with the air inlet of the rotary kiln.
The multi-path pipe 3 is composed of an exhaust gas portion 31 through which exhaust gas flows and a mixing portion 32 for mixing gas, the double-path movable pipe 4 penetrates the exhaust gas portion 31 and the mixing portion 32, the exhaust gas portion 31 and the mixing portion 32 are sealed by the side wall of the double-path movable pipe 4, the exhaust gas portion 31 is communicated with the chemical treatment device, and a reaction gas supply source and a shielding gas supply source are both communicated with the mixing portion 32 (note that the reaction gas supply source and the shielding gas supply source are adopted to be directly connected with the mixing portion 32, namely, gases required in the rotary kiln are mixed in the mixing portion 32 and conveyed through the double-path movable pipe 4, and a non-direct connection embodiment, namely, an electromagnetic valve is arranged at the connection part with the mixing portion 32 to control according to the requirement, which is a conventional technical means, this embodiment is not generally adopted, but is not meant to be excluded from the scope of protection, because it is necessary to additionally install a reaction gas supply source and a shielding gas supply source to the rotary kiln pipe and provide a plurality of solenoid valves, the two-way movable tube 4 is composed of an inner tube 41 and an outer tube 42, the outer tube 42 is sleeved outside the inner tube 41 with a gap reserved between the inner tube 41, a mixing gas passage 43 is formed between the outer wall of the inner tube 41 and the inner wall of the outer tube 42, the mixing gas passage 43 extends outside the mixing part 32 and communicates with the air inlet of the rotary kiln, the outer tube 42 is provided with an air hole 44 located inside the mixing part 32, the mixing part 32 communicates with the mixing gas passage 43 through the air hole 44, the side wall of the inner tube 41 is provided with an exhaust gas flow through hole 45, the exhaust gas flow through hole 45 does not communicate with the mixing gas passage 43, the exhaust gas flow hole 45 is selectively located in the exhaust gas portion 31 or the mixing portion 32, and the space between the exhaust gas portion 31 and the mixing portion 32 is sealed by the outer wall of the outer tube 42 or the outer wall of the inner tube 41.
The technical scheme has the working principle and beneficial effects that: taking the recycling of the exhaust gas as an example, the driving device drives the two-way movable tube 4 to move until the exhaust gas flow through holes 45 all enter the mixing portion 32, as shown in fig. 3, the exhaust gas flows into the exhaust gas flow through holes 45 through the inner tube 41 and enters the mixing portion 32 from the exhaust gas flow through holes 45, and at this time, the communication position between the mixing portion 32 and the exhaust gas portion 31 is sealed by the side wall of the two-way movable tube 4 (according to different structural arrangements, generally determined by the length of the outer tube 42, may be sealed by the outer wall of the outer tube 42, or may be sealed by the outer wall of the inner tube 41, as shown in fig. 3 and 4, and is sealed by the outer wall of the inner tube 41). The exhaust gas, the reaction gas, and the shielding gas are mixed in the mixing section 32 and are fed to the rotary kiln to react, thereby realizing the recycling of the exhaust gas and the replenishment of the mixed gas.
When the exhaust gas is not circulated, the driving device drives the two-way movable pipe 4 to move and the exhaust gas flow through hole 45 is located in the exhaust gas portion 31, as shown in fig. 4, at this time, the exhaust gas reaches the exhaust gas flow through hole 45 via the inner pipe 41 and enters the exhaust gas portion 31, and enters the chemical treatment apparatus from the exhaust gas portion 31 for chemical treatment. The air hole 44 on the outer tube 42 is always located in the mixing part 32, and the reaction gas and the shielding gas are mixed in the mixing part 32 and then enter the rotary kiln for reaction through the mixing gas path 43.
From this can realize the multi-purpose effect of a thing through waste gas screening plant, can carry out cyclic utilization with waste gas according to the user's demand, also can not set up actuating device to make double-circuit movable tube 4 can not remove, and then realize the effect that air feed and waste gas recovery used alone.
Because traditional chemical treatment all adopts to carry out independent edulcoration in proper order to certain impurity, when chemical edulcoration, how to improve edulcoration efficiency to improve the utilization ratio of edulcoration medicament then becomes the problem that needs to solve, chemical treatment device is by a plurality of module reaction case 5 upper and lower connection forms, and the bottom that is located the module reaction case 5 of below is provided with the liquid reserve tank for the required chemical agent of storage reaction, and the top that is located the module reaction case 5 of top is provided with the closing cap, be provided with circulating device (can be water pump etc. in the liquid reserve tank, can transport the liquid from the liquid reserve tank to the current structure or the prior art of the module reaction case 5 of top for in pumping the liquid in the liquid reserve tank to the module reaction case 5 of top, exhaust screening device's exhaust end runs through the liquid reserve tank with be located the module reaction case 5 of below communicates.
The module reaction box 5 is composed of a box body 51 and a water fall device arranged in the box body 51, the water fall device is composed of a baffle ring 52 annularly arranged on the inner wall of the box body 51 and a cylindrical sealing piece 54 with a downward opening, the opening is connected with the inner wall of the box body 51 through a water bearing plate 53, the top of the sealing piece 54 is circular, the top of the sealing piece 54 and the baffle ring 52 are positioned on the same horizontal plane, a gap is reserved between the circular outer wall of the top of the sealing piece 54 and the inner wall of the baffle ring 52 to form an annular drain outlet, and when the module reaction box is used, liquid is reserved on the annular drain outlet, so that a tubular water curtain can be formed when the liquid is reserved from the annular drain outlet, the sealing piece 54 is sealed, a lower water hole is reserved between the bottom of the sealing piece 54 and the water bearing plate 53, and the liquid on the water bearing plate 53, the tubular drain outlet reserved between the annular drain outlet and the annular water curtain 52 are reserved, and the liquid is thoroughly reserved on the sealing piece 54. The side wall of the sealing member 54 is provided with an exhaust hole, and exhaust gas can enter the water curtain through the exhaust hole and break the water curtain, so that impurities in the gas can be fully contacted with liquid to react. The seal 54 of the lowermost modular reaction tank 5 communicates with the exhaust end of the exhaust screening device.
In order to ensure the full reaction, a multi-layer module reaction box 5 can be arranged up and down, in order to ensure the water curtain to be uninterrupted, a gas guiding pipe 55 is arranged on the side wall of the box body 51, the gas inlet end of the gas guiding pipe 55 is positioned below the baffle ring 52, and the gas outlet end of the gas guiding pipe 55 extends to the top of the sealing piece 54. The exhaust gas that breaks the water curtain can be guided to the upper side of the sealing member 54 through the gas guiding pipe 55 because the two module reaction boxes 5 are disposed up and down, as shown in fig. 6, the liquid of the module reaction box 5 located above falls from the water drain hole of the water receiving plate 53 to form a seal, and the exhaust gas that has reacted through the module reaction box 5 below can be guided to the liquid above the sealing member 54, and can react again with the liquid above the baffle ring 52 and enter the sealing member 54 above when the gas guiding pipe 55 is discharged. Therefore, the waste gas can be repeatedly reacted with the liquid, the reaction is ensured to be sufficient, and the impurity removal efficiency and the utilization rate of the impurity removal medicament are improved.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
Although embodiments of the present invention have been disclosed above, it is not limited to the details and embodiments shown and described, it is well suited to various fields of use for which the invention would be readily apparent to those skilled in the art, and accordingly, the invention is not limited to the specific details and illustrations shown and described herein, without departing from the general concepts defined in the claims and their equivalents.
Claims (10)
1. An exhaust gas treatment device based on a high temperature rotary kiln, comprising:
the physical treatment device is used for communicating with the exhaust port of the rotary furnace and carrying out physical sedimentation on the exhaust gas;
the exhaust gas screening device is communicated with the exhaust port of the physical treatment device and is used for screening the exhaust gas after the particulate matters are removed by physical sedimentation;
when the total content of the reaction gas and the shielding gas in the waste gas is not less than 30%, the waste gas is mixed with the shielding gas and the reaction gas required by the reaction of the rotary furnace through the waste gas screening device, and enters the rotary furnace from the air inlet of the rotary furnace;
when the total content of the reaction gas and the protective gas in the waste gas is lower than 30%, the waste gas enters a chemical treatment device for waste gas treatment through the waste gas screening device and is discharged.
2. The waste gas treatment device based on a high-temperature rotary kiln according to claim 1, characterized in that the physical treatment device consists of a wet caisson (1) and a dry caisson (2), wherein the air inlet end of the wet caisson (1) is communicated with the air outlet of the rotary kiln, the air outlet end of the wet caisson (1) is communicated with the air inlet end of the dry caisson (2), the wet caisson (1) is filled with liquid, and at least three rotary filter screens connected with the inner wall shaft of the wet caisson (1) are arranged in the wet caisson (1), and the rotary shafts of the rotary filter screens are positioned above the liquid level, and at least three air inducing grid stops;
the three rotary filter screens are respectively a first filter screen (11) close to the air inlet end of the wet caisson (1), a third filter screen (13) close to the air outlet end of the wet caisson (1) and a second filter screen (12) arranged between the first filter screen (11) and the third filter screen (13), and the bottoms of the first filter screen (11) and the third filter screen (13) are positioned below the liquid level;
the three draft type baffles are respectively positioned between the air inlet end of the wet caisson (1) and the three rotary filter screens.
3. The waste gas treatment device based on the high-temperature rotary furnace according to claim 2, wherein three air inducing grid baffles are respectively first grid baffles (14) which are arranged at the top of the air inlet end of the wet caisson (1) and extend towards the liquid level; the second grid block (15) is arranged at the inner top of the wet caisson (1) and extends towards the liquid level, the second grid block (15) is positioned between the first filter screen (11) and the second filter screen (12), and the distance between the first grid block (14) and the second grid block (15) is matched with the rotation diameter of the first filter screen (11); the third grid baffle (16) is arranged at the bottom of the wet caisson (1) and extends upwards to the outside of the liquid level, the third grid baffle (16) is positioned between the second filter screen (12) and the third filter screen (13), a gap is reserved between the top of the third grid baffle (16) and the top of the wet caisson (1), and when the liquid levels at the two sides of the third grid baffle (16) are required to be level or only one liquid exists in the wet caisson (1), a through hole for communicating the liquid at the two sides is formed in the bottom of the third grid baffle (16); when different liquid levels are needed at the two sides of the third check (16), or different liquids are arranged at the two sides of the third check (16), no through holes are arranged.
4. The waste gas treatment device based on the high-temperature rotary furnace according to claim 2, wherein the dry caisson (2) is a rectangular box body (51) which is vertically arranged, the top of the dry caisson (2) is a conical exhaust port with a small upper part and a large lower part and is communicated with the air inlet end of the waste gas screening device, the side wall of the dry caisson (2) is provided with an air inlet communicated with the air outlet end of the wet caisson (1), and the air inlet is positioned above the liquid level in the wet caisson (1).
5. The high temperature rotary kiln based exhaust gas treatment device according to claim 1, characterized in that the exhaust gas screening device comprises a multi-pass pipe (3) communicating with a reaction gas supply source, a shielding gas supply source and the chemical treatment device, respectively; and a double-way movable pipe (4) which is arranged on the multi-way pipeline (3) and is movably connected with the multi-way pipeline (3) through a driving device, wherein a reaction gas supply source and a protective gas supply source are communicated with the double-way movable pipe (4) through the multi-way pipeline (3), the chemical treatment device is selectively communicated with one exhaust end of the double-way movable pipe (4) through the multi-way pipeline (3), the air inlet end of the double-way movable pipe (4) is communicated with the air outlet of the physical treatment device, and the other exhaust end of the double-way movable pipe (4) is positioned outside the multi-way pipeline (3) and is communicated with the air inlet of the rotary furnace.
6. The high-temperature rotary kiln exhaust gas treatment device according to claim 5, characterized in that the multi-path pipe (3) is composed of an exhaust gas portion (31) through which exhaust gas flows and a mixing portion (32) for mixing gas, the double-path movable pipe (4) penetrates through the exhaust gas portion (31) and the mixing portion (32), the space between the exhaust gas portion (31) and the mixing portion (32) is sealed by the side wall of the double-path movable pipe (4), the exhaust gas portion (31) is communicated with the chemical treatment device, a reaction gas supply source and a shielding gas supply source are both communicated with the mixing portion (32), the double-path movable pipe (4) is composed of an inner pipe (41) and an outer pipe (42), the outer pipe (42) is sleeved outside the inner pipe (41) and a gap is reserved between the outer wall of the inner pipe (41), a mixing gas path (43) is formed between the outer wall of the inner pipe (41) and the inner wall of the outer pipe (42), the mixing gas path (43) extends to the outside the mixing portion (32) and is communicated with the exhaust gas hole (44) through the air hole (44) arranged on the side wall of the inner pipe (32), the exhaust gas flow through hole (45) is not communicated with the mixing gas circuit (43), the exhaust gas flow through hole (45) is selectively positioned in the exhaust gas part (31) or the mixing part (32), and the exhaust gas part (31) and the mixing part (32) are sealed through the outer wall of the outer tube (42) or the outer wall of the inner tube (41).
7. The waste gas treatment device based on the high-temperature rotary furnace according to claim 1, wherein the chemical treatment device is formed by connecting a plurality of module reaction boxes (5) up and down, a liquid storage box is arranged at the bottom of the module reaction box (5) positioned at the lowest position, a sealing cover is arranged at the top of the module reaction box (5) positioned at the highest position, a circulating device is arranged in the liquid storage box and used for pumping liquid in the liquid storage box into the module reaction box (5) positioned at the highest position, and an exhaust end of the waste gas screening device penetrates through the liquid storage box and is communicated with the module reaction box (5) positioned at the lowest position.
8. The waste gas treatment device based on the high-temperature rotary furnace according to claim 7, wherein the module reaction box (5) is composed of a box body (51) and a water waterfall device arranged in the box body (51), the water waterfall device is composed of a baffle ring (52) annularly arranged on the inner wall of the box body (51) and a cylindrical sealing piece (54) with a downward opening connected with the inner wall of the box body (51) through a water bearing plate (53), the top of the sealing piece (54) is circular, the top of the sealing piece (54) and the baffle ring (52) are positioned on the same horizontal plane, a gap is reserved between the circular outer wall of the top of the sealing piece (54) and the inner wall of the baffle ring (52) to form an annular water outlet, the bottom of the sealing piece (54) extends to the lower side of the water bearing plate (53) and a water outlet is reserved between the sealing piece and the water bearing plate (53), an exhaust hole is reserved on the side wall of the sealing piece (54), and the exhaust gas of the lowest reaction box (5) is communicated with the exhaust gas screening device.
9. The exhaust gas treatment device based on a high temperature rotary kiln according to claim 8, characterized in that a gas guiding tube (55) is provided on a side wall of the housing (51), an inlet end of the gas guiding tube (55) is located below the baffle ring (52), and an outlet end of the gas guiding tube (55) extends to a top of the sealing member (54).
10. An exhaust gas treatment method of an exhaust gas treatment device based on a high temperature rotary kiln according to any one of claims 1 to 9, characterized by the treatment steps of:
s1: the waste gas after the reaction in the rotary furnace is sent to a physical treatment device through an exhaust port;
s2: the waste gas is subjected to physical sedimentation in a physical treatment device, and particulate matters in the waste gas are removed;
s3: the treated waste gas is sent into a waste gas screening device, and a sensor positioned in the waste gas screening device detects the waste gas components;
s4: if the total content of the reaction gas and the shielding gas in the waste gas is not less than 30%, the waste gas is mixed with the shielding gas provided by the shielding gas supply source and the reaction gas provided by the reaction gas supply source through the waste gas screening device, and the mixed waste gas is returned to the rotary furnace for reaction;
s4': if the total content of the reaction gas and the shielding gas in the exhaust gas is less than 30%, the exhaust gas enters a chemical treatment device for chemical treatment through an exhaust gas screening device and is discharged.
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| JPH08270922A (en) * | 1995-03-31 | 1996-10-18 | Agency Of Ind Science & Technol | Method for making fluorocarbon harmless |
| JP2002177766A (en) * | 2000-12-18 | 2002-06-25 | Pearl Kogyo Kk | Atmospheric pressure plasma treating device provided with unit for recovering/reusing inert gas |
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