CN113976097A - Oxygen-controlling roasting device and method containing activated carbon carrier and catalyst - Google Patents
Oxygen-controlling roasting device and method containing activated carbon carrier and catalyst Download PDFInfo
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- CN113976097A CN113976097A CN202111634233.3A CN202111634233A CN113976097A CN 113976097 A CN113976097 A CN 113976097A CN 202111634233 A CN202111634233 A CN 202111634233A CN 113976097 A CN113976097 A CN 113976097A
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- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J21/00—Catalysts comprising the elements, oxides, or hydroxides of magnesium, boron, aluminium, carbon, silicon, titanium, zirconium, or hafnium
- B01J21/18—Carbon
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
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Abstract
The invention relates to an oxygen-controlling roasting device containing an activated carbon carrier and a catalyst, wherein a discharge end of a rotary kiln is provided with an annular pipe and a plurality of distribution pipes for inputting nitrogen into the rotary kiln, the distribution pipes are straight pipe fittings, the annular pipe is an annular pipe fitting, the circumferential surface of the annular pipe is provided with a plurality of air holes with the opening directions parallel to the kiln line of the rotary kiln at intervals, and a feed opening at the discharge end of the rotary kiln is provided with at least two air injection pipes for injecting nitrogen to a material outlet. The invention provides nitrogen protection for the rotary kiln, so that the rotary kiln is roasted in the environment of low oxygen concentration or no oxygen, thereby preventing the carrier containing the active carbon or the catalyst from being ignited and burnt at high temperature; meanwhile, the frequency of the draught fan and the nitrogen gas inflow are adjusted, so that the micro positive pressure at the feed end is stabilized to be 1-8 Pa, the micro negative pressure at the discharge end is kept to be-1-5 Pa, oxygen is prevented from entering the rotary kiln from the feed end, nitrogen is sprayed at the discharge opening, the oxygen is prevented from entering the rotary kiln from the discharge end, and continuous industrial production is realized.
Description
Technical Field
The invention relates to the technical field of catalyst preparation, in particular to an oxygen-controlling roasting device and method containing an activated carbon carrier and a catalyst.
Background
The activated carbon has high water absorption, and when the activated carbon is used as a catalyst carrier, the activated carbon needs to be fully roasted after being dried to remove moisture, so that the precursor is decomposed into an active phase, namely, activated, and the interaction between the active phase and the carrier is enhanced, so that the active phase can be more uniformly attached to the surface of the carrier.
In the process of roasting the carrier containing the activated carbon and the carrier containing the activated carbon, if the temperature exceeds a certain range (for example, 400 ℃), the phenomenon of combustion scrapping of the carrier or the catalyst is easy to occur. At present, inert gas is generally introduced into a laboratory to ensure that roasting is carried out in an oxygen-free or low-oxygen atmosphere to prevent combustion of the activated carbon carrier. However, in the industrial production, when large-scale roasting equipment is adopted, on one hand, the roasting equipment has larger feed inlet and discharge outlet and auxiliary equipment communicated with the outside, so that the requirement of oxygen-free or low-oxygen is difficult to achieve, and the inert gas in the roasting equipment is unevenly distributed, so that the phenomenon of local combustion and ignition is easily caused; on the other hand, in order to avoid air entering the roasting equipment, the roasting equipment is generally incapable of industrial continuous production.
Disclosure of Invention
The invention aims to prevent the carrier containing the activated carbon and the catalyst from igniting and burning and realize industrial continuous production, thereby providing an oxygen-controlling roasting device and method for the carrier containing the activated carbon and the catalyst.
In order to achieve the above object, according to one aspect of the present invention, there is provided an oxygen-controlling calcination apparatus comprising a rotary kiln, wherein a feed end and a discharge end are respectively disposed at two ends of the rotary kiln, the rotary kiln is sequentially divided into a preheating section, a calcination section and a cooling section from the feed end to the discharge end, and the feed end of the rotary kiln is connected to an inlet end of a dust collector through an exhaust pipe;
the discharge end is provided with an annular pipe for inputting nitrogen into the rotary kiln and a plurality of distribution pipes, the distribution pipes are straight pipe fittings, one end of each distribution pipe penetrates through the discharge end and extends to the roasting section, and the other end of each distribution pipe is connected with a nitrogen source; the annular pipe is a circular pipe fitting, a plurality of air holes with the opening direction parallel to the kiln line of the rotary kiln are arranged on the circumferential surface of the annular pipe at intervals, the annular pipe is coaxially fixed at the position close to the discharge end in the rotary kiln, and the other end of the annular pipe is connected with a nitrogen source;
at least two gas injection pipes for injecting nitrogen to a material outlet are arranged at a feed opening at the discharge end of the rotary kiln;
the rotary kiln body is connected with an inlet end of a denitration tower through a pipeline, a gas outlet end of a dust collector is connected with an inlet end pipeline of the denitration tower, an outlet end of the denitration tower is connected with an induced draft fan, and dust collection pulse air of the dust collector is nitrogen.
Furthermore, a liquid nitrogen pipe used for spraying nitrogen into the dust collector is arranged at a discharge port of the dust collector.
Furthermore, a cooling grid plate is arranged at the outlet of the rotary kiln, a water cooling channel is formed inside the cooling grid plate, and two ends of the water cooling channel are connected with a cooling water inlet and a cooling water outlet.
Furthermore, the discharge end of the rotary kiln is provided with a plugging plate, and the distribution pipe and the annular pipe are fixed on the plugging plate at the discharge end.
Furthermore, a first pressure measuring pipe communicated with the interior of the rotary kiln is arranged on the plugging plate at the discharge end of the rotary kiln, and an external port of the first pressure measuring pipe is connected with a pressure gauge.
Furthermore, a compensation lead is arranged on a plugging plate at the discharge end of the rotary kiln, one end of the compensation lead enters the rotary kiln and is connected with a temperature probe in the middle of the rotary kiln, and the other end of the compensation lead is connected with a temperature display meter.
Furthermore, a plugging plate is arranged at the feeding end of the rotary kiln, a second pressure measuring pipe communicated with the interior of the rotary kiln is arranged on the plugging plate at the feeding end of the rotary kiln, and an outer port of the second pressure measuring pipe is connected with a micro-pressure meter.
Furthermore, a gate valve for adjusting the air exhaust amount is arranged on an exhaust pipe at the feed end of the rotary kiln.
Furthermore, the dust collector comprises a dust collecting bag and a dust collecting bin arranged at the lower part of the dust collecting bag, the dust collecting bag comprises a dust collecting cloth bag and a dust collecting bag framework used for supporting the dust collecting cloth bag, and the dust collecting bag framework and the dust collecting bin are grounded in an anti-static instrument level.
According to another aspect of the present invention, there is provided a method for oxygen-controlled calcination of a carrier containing activated carbon and a catalyst, the method using the above-mentioned apparatus for oxygen-controlled calcination of a carrier containing activated carbon and a catalyst, comprising the steps of:
starting an induced draft fan, igniting the rotary kiln, heating to a material roasting set temperature, and closing a discharge valve at a discharge opening;
starting a nitrogen source, introducing nitrogen into the rotary kiln, replacing for 30-60 minutes, detecting whether the nitrogen replacement is qualified or not, and feeding after the nitrogen replacement is qualified; adjusting the frequency of an induced draft fan and the air inflow of nitrogen to enable the stable micro-positive pressure at the feed end to be 1-8 Pa, and then feeding according to the specified feed amount, wherein the feed mode is continuous feed; opening a liquid nitrogen valve, introducing low-temperature nitrogen to a discharge end, opening a feed valve, adjusting the input amount of the low-temperature nitrogen to the discharge end, and keeping micro negative pressure of-1 to-5 Pa; after the roasting of the first batch of materials is completed, the discharge valve is opened and nitrogen is injected to the feed opening, and the discharge mode is continuous discharge.
According to the oxygen-controlling roasting device and method containing the activated carbon carrier and the catalyst, the distribution pipe is matched with the annular pipe, the protective nitrogen is reasonably distributed to all corners in the rotary kiln, and the oxygen in the rotary kiln is discharged. The rotary kiln feed opening department sets up the jet-propelled pipe, sprays nitrogen gas to the material export, and is isolated with the air when the guarantee material ejection of compact, prevents that the rotary kiln from advancing oxygen to play the cooling to hot material, prevent the combustion action. The air for dust collection pulse of the dust collector is nitrogen, so that oxygen is prevented from entering the dust collection bin, and the dust containing activated carbon is prevented from burning.
In conclusion, the invention adopts various measures to realize nitrogen protection, and the rotary kiln is roasted under the environment of low oxygen concentration or no oxygen, thereby avoiding the ignition and combustion of the carrier containing the active carbon or the catalyst at high temperature, effectively preventing or reducing oxygen from entering the rotary kiln and realizing continuous industrial production.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate exemplary embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention.
FIG. 1 is a schematic structural diagram of an oxygen-controlling calcination apparatus containing an activated carbon carrier and a catalyst according to the present invention.
Fig. 2 is a schematic view of the structure of the annular tube.
In the figure, 1-rotary kiln, 2-feeding end, 3-discharging end, 4-preheating section, 5-roasting section, 6-cooling section, 7-exhaust pipe, 8-dust collector, 9-annular pipe, 10-distribution pipe, 11-gas injection pipe, 12-denitration tower, 13-induced draft fan, 14-blocking plate, 15-nitrogen making unit, 16-air compressor, 17-gas storage tank, 18-dryer, 19-adsorption tower, 20-nitrogen making machine, 21-nitrogen storage tank, 22-gas bag, 23-flow meter, 24-liquid nitrogen storage tank, 25-cooling plate, 26-liquid nitrogen pipe, 27-gas pipeline, 28-combustion-supporting fan, 29-belt conveyor and 30-hot blast stove.
Detailed Description
In order that those skilled in the art will better understand the present invention, a more complete and complete description of the present invention is provided below in conjunction with the accompanying drawings and embodiments. In addition, the features of the embodiments and examples in the present application may be combined with each other without conflict.
The invention provides an oxygen-control roasting device containing an activated carbon carrier and a catalyst, which comprises a rotary kiln 1, wherein a feed end 2 and a discharge end 3 are respectively arranged at two ends of the rotary kiln 1, the rotary kiln 1 is sequentially divided into a preheating section 4, a roasting section 5 and a cooling section 6 from the feed end 2 to the discharge end 3, and the feed end 2 of the rotary kiln 1 is connected with an inlet end of a dust collector 8 through an exhaust pipe 7.
On the basis, the discharge end 3 is provided with an annular pipe 9 for inputting nitrogen into the rotary kiln 1 and a plurality of distribution pipes 10. Distribution pipe 10 is the straight tube spare, and distribution pipe 10 one end runs through discharge end 3 and extends to calcination section 5, and the nitrogen gas source is connected to the distribution pipe 10 other end. The annular pipe 9 is a circular ring-shaped pipe fitting, a plurality of air holes with the opening directions parallel to the kiln line of the rotary kiln 1 are arranged on the circumferential surface of the annular pipe 9 at intervals, the annular pipe 9 is coaxially fixed at the position close to the discharge end 3 inside the rotary kiln 1, and the other end of the annular pipe 9 is connected with a nitrogen source.
The annular pipe 9 is matched with the distribution pipe 10 to reasonably distribute the protective nitrogen input into the rotary kiln 1 to all corners in the rotary kiln. The annular pipe 9 inputs nitrogen gas in the cooling section, and the annular pipe 9 is provided with air holes, so that the nitrogen gas is uniformly diffused in the rotary kiln after being output, and the distribution pipe 10 is mainly used for supplementing the nitrogen gas to the roasting section.
The discharge end 3 of the rotary kiln 1 is provided with a plugging plate 14, and the distribution pipe 10 and the annular pipe 9 are both fixed on the plugging plate 14 of the discharge end 3. In the specific embodiment, 4 phi 25 distribution pipes are welded on a discharge end plugging plate 14 of the rotary kiln, a phi 40 annular pipe is fixed inside the discharge end plugging plate 14, a phi 10 circular hole is formed in each 15cm of the pipe, the hole opening direction is parallel to the kiln line, and the 4 distribution pipes 10 are connected with the annular pipe 9 to form a nitrogen source.
In addition, the bottom of the discharge end of the rotary kiln 1 is provided with a feed opening, and the feed opening is provided with at least two gas injection pipes 11 used for injecting nitrogen to the outlet material. Isolated with the air when the guarantee material ejection of compact, prevent that the rotary kiln from advancing oxygen to play the cooling to hot material, prevent the combustion action. The preferred embodiment is to add two opposite gas injection pipes 11 at the feed opening of the rotary kiln to achieve the technical effect.
The rotary kiln 1 is connected with the inlet end of a denitration tower 12 through a pipeline, the gas outlet end of a dust collector 8 is connected with the inlet end pipeline of the denitration tower 12, and the outlet end of the denitration tower 12 is connected with an induced draft fan 13. Ammonia water and compressed air are input into the top of the denitration tower 12, and a hot blast stove 30 is prepared. The product enters a dust collector to absorb dust, and nitrogen oxide is decomposed after passing through a denitration tower to reach the gas emission standard, so that the product has a protection effect on the environment.
And the wind for dust collection pulse of the dust collector 8 is nitrogen, and is used for preventing oxygen from entering the dust collector and preventing dust containing activated carbon from burning.
In this embodiment, the nitrogen source is a nitrogen generator set 15 or an outsourcing nitrogen gas. The nitrogen making unit 15 comprises an air compressor 16, an air storage tank 17, a dryer 18, an adsorption tower 19 and a nitrogen making machine 20 which are connected in sequence; the gas outlet of the nitrogen generator 20 is connected with a nitrogen storage tank 21, the nitrogen storage tank 21 is connected with a gas bag 22, and a flow meter 23 is arranged on a connecting pipeline of the nitrogen storage tank 21 and the gas bag 22. Both the annular pipe 9 and the distribution pipe 10 are connected to said air bag 22. The purchased nitrogen gas is stored in a liquid nitrogen storage tank 24, and the liquid nitrogen storage tank 24 is connected with the gas bag 22.
Under the action of the draught fan 13, nitrogen enters the rotary kiln through the annular pipe 9 and the distribution pipe 10. Preferably, 30m is used2The/min nitrogen making machine set provides sufficient and continuous nitrogen for nitrogen protection.
The invention provides nitrogen protection for the rotary kiln, so that the rotary kiln is roasted in the environment of low oxygen concentration or no oxygen, thereby preventing the carrier containing the active carbon or the catalyst from being ignited and burnt at high temperature; meanwhile, the frequency of the draught fan and the nitrogen gas inflow are adjusted, so that the micro positive pressure at the feed end is stabilized to be 1-8 Pa, the micro negative pressure at the discharge end is kept to be-1-5 Pa, oxygen is prevented from entering the rotary kiln from the feed end, nitrogen is sprayed at the discharge opening, the oxygen is prevented from entering the rotary kiln from the discharge end, and continuous industrial production is realized.
In a preferred embodiment, a cooling grid plate 25 is arranged at the outlet of the feed opening of the rotary kiln 1, a water cooling channel is formed inside the cooling grid plate 25, and two ends of the water cooling channel are connected with a cooling water inlet and a cooling water outlet and are used for being matched with low-temperature nitrogen to further cool the carrier or the catalyst containing the activated carbon.
And a first pressure measuring pipe communicated with the interior of the rotary kiln 1 is arranged on the plugging plate 14 at the discharge end 3 of the rotary kiln, and the outer port of the first pressure measuring pipe is connected with a pressure gauge for observing the atmospheric pressure in the rotary kiln at any time.
And a compensation lead is arranged on the plugging plate 14 at the discharge end 3 of the rotary kiln, one end of the compensation lead enters the rotary kiln and is connected with a temperature probe at the middle part of the rotary kiln, and the other end of the compensation lead is connected with a temperature display meter. In a relatively specific embodiment, a phi 25 round hole is formed in the center of a plugging plate 3 at the discharging end of the rotary kiln, a 10m compensation lead is connected, the compensation lead is connected with a temperature probe in the middle of the rotary kiln, and a temperature display table is connected at a discharging position for observing the temperature of the atmosphere in the rotary kiln at any time.
In a relatively specific embodiment, the feeding end 2 of the rotary kiln 1 is provided with a plugging plate 14, a second pressure measuring pipe communicated with the interior of the rotary kiln 1 is arranged on the plugging plate 14 of the feeding end 2 of the rotary kiln, and an outer port of the second pressure measuring pipe is connected with a micro-pressure meter for observing the atmosphere pressure of a kiln head at any time. In the preferred embodiment, a pipe phi 25 is drilled and welded on the plugging plate 14 at the feed end 2 of the rotary kiln to connect the micro-pressure gauge.
And a gate valve for adjusting the air exhaust amount is arranged on the exhaust pipe 7 at the feed end 2 of the rotary kiln 1.
The dust collector 8 comprises a dust collecting bag and a dust collecting bin arranged at the lower part of the dust collecting bag, the dust collecting bag comprises a dust collecting cloth bag and a dust collecting bag framework used for supporting the dust collecting cloth bag, the dust collecting bag framework and the dust collecting bin are grounded in an antistatic instrument level mode, and static electricity generated when active carbon dust falls on the dust collecting bag is prevented from igniting dust collecting materials and the dust collecting cloth bag. A liquid nitrogen pipe 26 for spraying nitrogen into the dust collector is arranged at a discharge port at the lower end of the dust collection bag, so that when the temperature rise phenomenon in the dust collection bin is found, a liquid nitrogen valve is opened at any time to reduce the temperature in the dust collection bin, and the dust collection bag is prevented from being ignited by burning of dust containing activated carbon powder.
The bottom of the dust collection bag is provided with a temperature probe which is connected with a feeding post temperature display instrument so that an operator can observe the temperature in the dust collection bin at any time.
The rotary kiln 1 is obliquely arranged and can rotate around a shaft, a gas pipeline 27 and a plurality of gas nozzles are arranged at the bottom of the rotary kiln 1, the gas pipeline 27 is connected with a combustion fan 28, and heat energy required by roasting is provided by gas combustion.
When the oxygen-controlled roasting device containing the activated carbon carrier and the catalyst is produced, the induced draft fan 13 is started, the rotary kiln is ignited and heated to the material roasting set temperature, and the discharge valve at the discharge opening is closed.
And then, starting a nitrogen source, introducing nitrogen into the rotary kiln 1 through the annular pipe 9 and the distribution pipe 10, replacing for 30-60 minutes, detecting whether the nitrogen replacement is qualified or not, and feeding after the nitrogen replacement is qualified. The present invention uses a belt conveyor 29 for continuous feeding.
And adjusting the frequency of the draught fan 13 and the air inflow of nitrogen to stably keep the feed end of the rotary kiln 1 at micro-positive pressure of 1-8 Pa, and then feeding according to the specified feed quantity, wherein the feed mode is continuous feed.
And opening a liquid nitrogen valve, introducing low-temperature nitrogen to the discharge end, opening a feed valve, and adjusting the input amount of the low-temperature nitrogen to the discharge end to keep micro negative pressure of-1 to-5 Pa. During the period, the materials are sequentially conveyed from the preheating section 4 and the roasting section 5 to the cooling section 6 along with the rotation of the rotary kiln, and the reasonable rotating speed is set to ensure that the materials can reach the set roasting time in the rotary kiln 1.
After the first batch of materials reach the cooling section 6, the discharge valve is opened and nitrogen is injected to the feed opening through the injection pipe, and then the discharge valve is kept open, and the discharge mode is continuous discharge.
The scope of the invention is not limited to the above embodiments, and various modifications and changes may be made by those skilled in the art, and any modifications, improvements and equivalents within the spirit and principle of the invention should be included in the scope of the invention.
Claims (10)
1. An oxygen-control roasting device containing an activated carbon carrier and a catalyst comprises a rotary kiln, wherein a feed end (2) and a discharge end (3) are respectively arranged at two ends of the rotary kiln (1), the rotary kiln (1) is sequentially divided into a preheating section (4), a roasting section (5) and a cooling section (6) from the feed end (2) to the discharge end (3), and the feed end (2) of the rotary kiln (1) is connected with the inlet end of a dust collector (8) through an exhaust pipe (7);
the method is characterized in that: the discharge end (3) is provided with an annular pipe (9) for inputting nitrogen into the rotary kiln (1) and a plurality of distribution pipes (10), the distribution pipes (10) are straight pipe fittings, one ends of the distribution pipes (10) penetrate through the discharge end and extend to the roasting section (5), and the other ends of the distribution pipes (10) are connected with a nitrogen source; the annular pipe (9) is a circular pipe fitting, a plurality of air holes with the opening direction parallel to the kiln line of the rotary kiln (1) are arranged on the circumferential surface of the annular pipe (9) at intervals, the annular pipe (9) is coaxially fixed at the position close to the discharge end (3) in the rotary kiln (1), and the other end of the annular pipe (9) is connected with a nitrogen source;
at least two gas injection pipes (11) for injecting nitrogen to a material outlet are arranged at a feed opening of the discharge end (3) of the rotary kiln (1);
the rotary kiln (1) is connected with an inlet end of a denitration tower (12) through a pipeline, an outlet end of a dust collector (8) is connected with an inlet end pipeline of the denitration tower (12), an outlet end of the denitration tower (12) is connected with an induced draft fan (13), and dust collection pulse air of the dust collector (8) is nitrogen.
2. The oxygen-controlling calcination apparatus containing an activated carbon support and a catalyst according to claim 1, characterized in that: a liquid nitrogen pipe (26) used for spraying nitrogen into the dust collector (8) is arranged at the discharge port of the dust collector (8).
3. The oxygen-controlling calcination apparatus containing an activated carbon support and a catalyst according to claim 1 or 2, characterized in that: and a cooling grid plate (25) is arranged at the outlet of the rotary kiln (1), a water cooling channel is formed in the cooling grid plate (25), and two ends of the water cooling channel are connected with a cooling water inlet and a cooling water outlet.
4. The oxygen-controlling calcination apparatus containing an activated carbon support and a catalyst according to claim 3, characterized in that: the discharge end (3) of the rotary kiln (1) is provided with a plugging plate (14), and the distribution pipe (10) and the annular pipe (9) are fixed on the plugging plate (14) of the discharge end.
5. The oxygen-controlling calcination apparatus containing an activated carbon support and a catalyst according to claim 4, wherein: and a plugging plate (14) at the discharge end (3) of the rotary kiln (1) is provided with a first piezometer tube communicated with the interior of the rotary kiln (1), and the outer port of the first piezometer tube is connected with a piezometer.
6. The oxygen-controlling calcination apparatus containing an activated carbon support and a catalyst according to claim 5, wherein: a compensation lead is arranged on a plugging plate (14) at the discharge end (3) of the rotary kiln (1), one end of the compensation lead enters the rotary kiln (1) and is connected with a temperature probe at the middle part of the rotary kiln (1), and the other end of the compensation lead is connected with a temperature display meter.
7. The oxygen-controlling calcination apparatus containing an activated carbon support and a catalyst according to claim 6, wherein: a plugging plate (14) is arranged at the feed end (2) of the rotary kiln (1), a second pressure measuring pipe communicated with the interior of the rotary kiln (1) is arranged on the plugging plate at the feed end (2) of the rotary kiln (1), and an outer port of the second pressure measuring pipe is connected with a micro-pressure meter.
8. The oxygen-controlling calcination apparatus containing an activated carbon support and a catalyst according to claim 1 or 7, characterized in that: and a gate valve for adjusting the air exhaust amount is arranged on an exhaust pipe (7) at the feed end (2) of the rotary kiln (1).
9. The oxygen-controlling calcination apparatus containing an activated carbon support and a catalyst according to claim 8, wherein: the dust collector (8) comprises a dust collecting bag and a dust collecting bin arranged at the lower part of the dust collecting bag, the dust collecting bag comprises a dust collecting cloth bag and a dust collecting bag framework used for supporting the dust collecting cloth bag, and the dust collecting bag framework and the dust collecting bin are grounded in an anti-static instrument level.
10. An oxygen-controlling roasting method of a carrier and a catalyst containing activated carbon, which is characterized in that the oxygen-controlling roasting device of any one of claims 1 to 9 containing the carrier and the catalyst containing activated carbon comprises the following steps:
starting an induced draft fan (13), igniting the rotary kiln (1), heating to a material roasting set temperature, and closing a discharge valve at a discharge opening; starting a nitrogen source, introducing nitrogen into the rotary kiln (1), replacing for 30-60 minutes, detecting whether nitrogen replacement is qualified, and feeding after the nitrogen replacement is qualified; adjusting the frequency of a draught fan (13) and the nitrogen gas inflow to enable a feed end (2) to be stable at a micro-positive pressure of 1-8 Pa, and then feeding according to a specified feed amount in a continuous feed mode; opening a liquid nitrogen valve, introducing low-temperature nitrogen to a discharge end, opening a feed valve, adjusting the input amount of the low-temperature nitrogen to the discharge end, and keeping micro negative pressure of-1 to-5 Pa; after the roasting of the first batch of materials is completed, the discharge valve is opened and nitrogen is injected to the feed opening, and the discharge mode is continuous discharge.
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