CN111141138A - Device and method for reducing oxygen content of hot air for drying coal slime in gas oxidation furnace - Google Patents
Device and method for reducing oxygen content of hot air for drying coal slime in gas oxidation furnace Download PDFInfo
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- CN111141138A CN111141138A CN202010085891.0A CN202010085891A CN111141138A CN 111141138 A CN111141138 A CN 111141138A CN 202010085891 A CN202010085891 A CN 202010085891A CN 111141138 A CN111141138 A CN 111141138A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/001—Drying-air generating units, e.g. movable, independent of drying enclosure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L7/00—Supplying non-combustible liquids or gases, other than air, to the fire, e.g. oxygen, steam
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H3/00—Air heaters
- F24H3/02—Air heaters with forced circulation
- F24H3/025—Air heaters with forced circulation using fluid fuel
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/20—Arrangement or mounting of control or safety devices
- F24H9/2064—Arrangement or mounting of control or safety devices for air heaters
- F24H9/2085—Arrangement or mounting of control or safety devices for air heaters using fluid fuel
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/004—Nozzle assemblies; Air knives; Air distributors; Blow boxes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/06—Controlling, e.g. regulating, parameters of gas supply
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/06—Controlling, e.g. regulating, parameters of gas supply
- F26B21/10—Temperature; Pressure
Abstract
The invention relates to a device and a method for reducing the oxygen content of hot air for drying coal slime in a gas oxidation furnace. The technical scheme is as follows: the device comprises a gas oxidation system and a drying hot air oxygen content control system, wherein a gas pipeline is connected with an inlet of a blower, and an outlet of the blower is sequentially connected with an inlet of a reversing valve and a gas oxidation furnace; the outlet of the reversing valve is connected with an oxidation furnace chimney, the two ends of the backflow pipeline are connected with a gas pipeline and the oxidation furnace chimney, and the middle of the backflow pipeline is provided with an oxygen-containing regulating valve, so that the device has the following beneficial effects: the popularization adaptation range is expanded: the oxygen content of the drying hot air is reduced due to the self-oxidation flue gas recycling, and the drying hot air is adjustable according to actual conditions, so that project construction and operation are not influenced even if no available inert gas mixing oxygen reduction resource condition exists on site; the heat utilization rate of the oxidation furnace is high: as about 15 percent of low-temperature flue gas of the oxidation furnace at 85 ℃ is utilized in the backflow process, the heat of gas oxidation is further utilized, and the method is more economical and reasonable compared with the prior art of arranging a low-temperature flue gas heat regenerator.
Description
Technical Field
The invention relates to a coal mine gas and coal slime utilization technology, in particular to a device and a method for reducing the oxygen content of hot air for drying coal slime in a gas oxidation furnace.
Background
The coal mine gas oxidation technology is basically mature after being researched for more than ten years and applied industrially on site, standards of NB/T51012 coal mine wind gas discharge heat accumulation type oxidation device and NB/T51013 coal mine wind gas discharge heat accumulation type oxidation device engineering application safety requirement are released and implemented in 2014, at present, more than 20 projects are built and operated nationwide, coal mine gas oxidation is accepted by society, positive and far-reaching effects on energy conservation and emission reduction and atmospheric environment protection of the coal industry are achieved, more than 70% of coal in China can be sold and used after being washed and selected, coal washing generates a large amount of coal slime, the original dried coal slime is a coal-fired hot air furnace, due to the requirement of environmental protection, the coal-fired hot air furnace is stopped, a large amount of coal slime is accumulated, occupies land, and causes environmental hazards of fine flying dust and rain sludge black water, and becomes a headache problem of the coal industry, according to the method, certain coal mines in China have gas resources, the gas oxidation discharge is clean, no dust pollution is caused, no NOx is generated, the coal slime is dried by heat generated by gas oxidation, the gas resources are utilized, the coal slime is recycled, the dried coal slime and coal are mixed and burned in a power plant boiler, and the clean discharge is realized by using a power plant tail gas treatment system.
In 2015, a hot air coal slurry drying project is built by using high-temperature oxidized smoke at about 950 ℃ of a gas oxidation furnace and tail gas of a gas internal combustion engine generator set at about 500 ℃ to be mixed with hot air dried coal slurry at about 700 ℃, the oxygen content of the tail gas of the gas internal combustion engine generator set is lower than 7%, the oxygen content is controlled below 14% after the tail gas is mixed with the smoke of the gas oxidation furnace with the oxidation amount of about 19%, explosion accidents in a roller dryer can not occur, the project is based on that the mine has sufficient tail gas of the gas internal combustion engine generator set, the oxygen content of hot air used for drying coal slurry is controlled in a safe range, coal mines with the conditions are few in reality, the oxygen content of the hot air used for drying the coal slurry (such as nitrogen making mixing and the like) is controlled by other means, and the gas oxidation furnace is difficult to popularize and apply in the coal slurry drying technology under the existing technical conditions, therefore, it is necessary to find a safe, reliable, economical method for drying coal slurry in a gas oxidizing furnace.
Disclosure of Invention
The invention aims to provide a device and a method for reducing the oxygen content of hot air for drying coal slime in a gas oxidation oven, aiming at the defects in the prior art.
The invention provides a device for reducing the oxygen content of hot air for drying coal slime in a gas oxidation furnace, which adopts the technical scheme that: the system comprises a gas oxidation system, a drying hot air oxygen content control system, a drying hot air temperature control system and an equipment start-stop and drying hot air conveying operation system, wherein a gas pipeline (1) is connected with an inlet of a blower (4), and an outlet of the blower (4) is sequentially connected with an inlet of a reversing valve (7) and a gas oxidation furnace (8); the outlet of the reversing valve (7) is connected with an oxidation furnace chimney (5), and the mechanisms form a gas oxidation system; the two ends of the backflow pipeline (3) are connected with a gas pipeline (1) and an oxidation furnace chimney (5), an oxygen-containing regulating valve (2) is arranged in the middle, and the mechanisms form a drying hot air oxygen content control system;
the two ends of the temperature adjusting pipeline (10) are connected with an oxidation furnace chimney (5) and a hot air temperature adjusting valve (12), wherein an induced draft fan (6) is arranged at the side close to the oxidation furnace chimney (5), the hot air temperature adjusting valve (12) is arranged at the side close to the hot air temperature adjusting box (11), the two ends of the high-temperature hot air pipeline (9) are connected with a gas oxidation furnace (8) and the hot air temperature adjusting box (11), and the mechanisms form a drying hot air temperature control system and assist in controlling the oxygen content;
the functional chimney (14) is connected with the hot air temperature regulating box (11), and the functional chimney (14) is provided with a functional smoke exhaust valve (13), a functional oxygen sensor (15) and a functional temperature sensor (16); the outlet of the hot air temperature regulating box (11) is sequentially connected with a drying hot air valve (17) and a hot air pipeline (20), a drying hot air temperature sensor (18) and a drying hot air oxygen sensor (19) are arranged on the hot air pipeline (20), and the mechanisms form an equipment start-stop and drying hot air conveying operation system.
Preferably, under the suction action of the blower (4), part of low-temperature flue gas in the oxidation furnace chimney (5) is mixed with coal mine gas and then oxidized in the gas oxidation furnace (8), the reflux quantity is adjusted through the oxygen-containing adjusting valve (2), and the requirement of drying the oxygen content of hot air is met through multiple circulation control.
Preferably, the induced draft fan (6) is used as power to be adjusted through the temperature adjusting pipeline (10) and the hot air temperature adjusting valve (12), low-temperature flue gas is sent into the hot air temperature adjusting box (11), the temperature of high-temperature flue gas from the gas oxidation furnace (8) is reduced, and meanwhile, the oxygen content of hot air for drying coal slime can be reduced in an auxiliary mode.
Preferably, the functional smoke exhaust valve (13), the functional chimney (14), the functional oxygen sensor (15) and the functional temperature sensor (16) form an equipment start-stop operation system, the functional smoke exhaust valve (13), the functional oxygen sensor (15) and the functional temperature sensor (16) are installed on the functional chimney (14), the functional chimney (14) is installed on the hot air temperature regulating box (11), the pre-regulation of the oxygen content and the temperature of drying hot air can be realized before the drying system works, and when the drying system breaks down or stops, the heat stored in the gas oxidation furnace can be exhausted.
Preferably, foretell hot-blast thermoregulation box (11) is including letting out explode hole plug (11.1), high temperature flue gas import (11.2), low temperature flue gas import (11.3), metal casing (11.4), high temperature exhanst gas outlet (11.5), heat preservation (11.6), stoving exhanst gas outlet (11.7), metal casing (11.4) are the tubular structure, are equipped with heat preservation (11.6) in the outside, and one end is equipped with lets out explode hole plug (11.1), and the other end is equipped with stoving exhanst gas outlet (11.7), is equipped with high temperature flue gas import (11.2), low temperature exhanst gas inlet (11.3) and high temperature exhanst gas outlet (11.5) on metal casing (11.4) in proper order.
Preferably, the high-temperature flue gas inlet (11.2) is an inclined hole inclined at a certain angle, and the low-temperature flue gas inlet (11.3) and the high-temperature flue gas outlet (11.5) are vertical holes.
Preferably, the inner layer of the metal shell (11.4) is provided with an inner surface ceramic coating layer (11.8).
The use method of the device for reducing the oxygen content of the hot air for drying the coal slime in the gas oxidation furnace comprises the following steps:
(1) preparation work: igniting and starting the gas oxidation furnace to ensure that the gas oxidation furnace stably operates at the methane concentration of about 1 percent and the temperature in the furnace of about 1000 ℃;
(2) drying hot air debugging: closing the drying hot blast valve (17), opening the functional smoke exhaust valve (13), sequentially opening the induced draft fan (6), the hot blast temperature adjusting valve (12) and the oxygen-containing adjusting valve (2), adjusting by the control system, and opening the drying hot blast valve (17) and closing the functional smoke exhaust valve (13) when the functional oxygen sensor (15) and the functional temperature sensor (16) reach the set oxygen-containing concentration and temperature;
(3) and (4) normal operation: the drying hot air temperature sensor (18) and the drying hot air oxygen sensor (19) are put into operation, and the control system commands and adjusts the oxygen-containing regulating valve (2), the hot air temperature regulating valve (12) and the drying hot air valve (17) according to the monitored temperature and oxygen content so as to adapt to the change of working conditions and maintain the normal operation of the system;
(4) emergency handling and shutdown: when the system is out of control or normally shut down, the functional smoke exhaust valve (13) is opened and the drying hot blast valve (17) is closed in sequence to release the heat stored in the gas oxidation furnace.
Preferably, in the step 3, the normal operation is performed at a temperature of 700 ℃ while maintaining the oxygen content of the drying hot air to be not higher than 14%.
Compared with the prior art, the invention has the following beneficial effects:
the invention controls the oxygen content of hot air output by the oxidation furnace for drying coal slime to be below 14 percent by adjusting the reflux to recycle the low-temperature smoke of the oxidation furnace with lower oxygen content, thereby ensuring that the deflagration phenomenon cannot occur in the roller dryer. The specific implementation mode is as follows: firstly, a backflow pipeline and an adjusting valve are arranged between a low-temperature chimney of a gas oxidation furnace and an inlet of a blower, part of low-temperature exhaust gas of the oxidation furnace is sucked by the blower and is mixed with gas to be oxidized in the oxidation furnace; and secondly, a temperature adjusting pipeline, an adjusting valve and an induced draft fan are arranged between the low-temperature chimney of the gas oxidation furnace and the hot air temperature adjusting box, the low-temperature flue gas of the oxidation furnace is sent to the hot air temperature adjusting box, and is mixed with high-temperature hot air from the inside of the oxidation furnace to cool, and the oxygen content is reduced in an auxiliary manner. And controlling the content of hot air entering the coal slime drum dryer within a set safety range through multiple circulation and control. The method not only reduces the oxygen content of the drying hot air, but also recycles part of heat of the low-temperature flue gas, thereby realizing the double effects of safety and energy conservation;
the popularization adaptation range of the invention is expanded: the oxygen content of the drying hot air is reduced due to the self-oxidation flue gas recycling, and the drying hot air is adjustable according to actual conditions, so that project construction and operation are not influenced even if no available inert gas mixing oxygen reduction resource condition exists on site;
the oxidation furnace of the invention has high heat utilization rate: as about 15 percent of low-temperature flue gas of the oxidation furnace at 85 ℃ is utilized in the backflow process, the heat of gas oxidation is further utilized, and the method is more economical and reasonable compared with the prior art of arranging a low-temperature flue gas heat regenerator.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic structural view of a first embodiment of a hot air temperature-adjusting box;
FIG. 3 is a schematic structural view of a second embodiment of the hot air temperature-adjusting box;
in the upper diagram: the system comprises a gas pipeline 1, an oxygen-containing regulating valve 2, a backflow pipeline 3, a blower 4, an oxidation furnace chimney 5, an induced draft fan 6, a reversing valve 7, a gas oxidation furnace 8, a high-temperature hot air pipeline 9, a temperature regulating pipeline 10, a hot air temperature regulating box 11, a hot air temperature regulating valve 12, a functional smoke exhaust valve 13, a functional chimney 14, a functional oxygen sensor 15, a functional temperature sensor 16, a drying hot air valve 17, a drying hot air temperature sensor 18, a drying hot air oxygen sensor 19 and a hot air pipeline 20; coal mine gas A, low-temperature flue gas B, high-temperature flue gas C and drying hot air D;
the explosion venting hole plug 11.1, the high-temperature flue gas inlet 11.2, the low-temperature flue gas inlet 11.3, the metal shell 11.4, the high-temperature flue gas outlet 11.5, the heat preservation layer 11.6, the drying hot air outlet 11.7 and the inner surface ceramic coating layer 11.8.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.
the two ends of the temperature adjusting pipeline 10 are connected with an oxidation furnace chimney 5 and a hot air temperature adjusting valve 12, wherein a draught fan 6 is arranged at the side close to the oxidation furnace chimney 5, the hot air temperature adjusting valve 12 is arranged at the side close to the hot air temperature adjusting box 11, the two ends of the high-temperature hot air pipeline 9 are connected with a gas oxidation furnace 8 and the hot air temperature adjusting box 11, and the mechanisms form a drying hot air temperature control system and assist in controlling the oxygen content;
the functional chimney 14 is connected with the hot air temperature regulating box 11, and the functional chimney 14 is provided with a functional smoke exhaust valve 13, a functional oxygen sensor 15 and a functional temperature sensor 16; the outlet of the hot air temperature regulating box 11 is sequentially connected with a drying hot air valve 17 and a hot air pipeline 20, a drying hot air temperature sensor 18 and a drying hot air oxygen sensor 19 are arranged on the hot air pipeline 20, and the mechanisms form an equipment start-stop and drying hot air conveying operation system.
Under the action of the suction force of the blower 4, part of low-temperature flue gas in the oxidation furnace chimney 5 is mixed with coal mine gas and then oxidized in the gas oxidation furnace 8, the backflow quantity is adjusted through the oxygen-containing adjusting valve 2, and the requirement of drying the oxygen content of hot air is met through multiple circulation control.
The draught fan 6 is used as power to be adjusted through the temperature adjusting pipeline 10 and the hot air temperature adjusting valve 12, low-temperature flue gas is sent into the hot air temperature adjusting box 11, the temperature of the high-temperature flue gas from the gas oxidation furnace 8 is reduced, and meanwhile, the oxygen content of hot air for drying coal slime can be reduced in an auxiliary mode.
The blower 4 and the draught fan 6 are used as power, the heat brought by the low-temperature flue gas respectively sent into the gas oxidation furnace 8 and the hot air temperature regulating box 11 is recycled, and the heat efficiency of the gas oxidation furnace is improved.
In addition, the functional smoke exhaust valve 13, the functional chimney 14, the functional oxygen sensor 15 and the functional temperature sensor 16 form an equipment start-stop operation system, the functional smoke exhaust valve 13, the functional oxygen sensor 15 and the functional temperature sensor 16 are arranged on the functional chimney 14, the functional chimney 14 is arranged on the hot air temperature regulating box 11, the pre-regulation of the oxygen content and the temperature of the drying hot air can be realized before the drying system works, and when the drying system breaks down or stops, the heat stored in the gas oxidation furnace can be discharged.
Referring to the attached drawing 2, the hot air temperature regulating box 11 of the invention comprises an explosion venting hole plug 11.1, a high temperature flue gas inlet 11.2, a low temperature flue gas inlet 11.3, a metal shell 11.4, a high temperature flue gas outlet 11.5, a heat insulating layer 11.6 and a drying hot air outlet 11.7, wherein the metal shell 11.4 is of a cylindrical structure, the heat insulating layer 11.6 is arranged on the outer side, the explosion venting hole plug 11.1 is arranged at one end of the metal shell, the drying hot air outlet 11.7 is arranged at the other end of the metal shell, and the high temperature flue gas inlet 11.2, the low temperature flue gas inlet 11.3 and the high temperature flue gas outlet 11.5 are sequentially.
Wherein, the high temperature flue gas inlet 11.2 is an inclined hole inclined at a certain angle, and the low temperature flue gas inlet 11.3 and the high temperature flue gas outlet 11.5 are vertical holes.
In addition, the metal shell 11.4 is formed by welding metal steel plates, the heat insulation layer 11.6 is made of a high-alumina ceramic fiber folding module, and the explosion venting hole plug 11.1 is made of an explosion venting sheet and the high-alumina ceramic fiber folding module.
The high-temperature flue gas inlet direction and the hot air temperature regulating box form a certain angle and tend to a drying hot air outlet, the low-temperature flue gas inlet direction is perpendicular to the hot air temperature regulating box, so that the high-temperature flue gas and the low-temperature flue gas are uniformly mixed, the high-temperature flue gas outlet is close to the drying hot air outlet and is perpendicular to the hot air temperature regulating box, the explosion venting hole plug and the drying hot air outlet are oppositely arranged, and possible explosion pressure waves in the roller dryer can be rapidly released conveniently.
The use method of the device for reducing the oxygen content of the hot air for drying the coal slime in the gas oxidation furnace comprises the following steps:
(1) preparation work: igniting and starting the gas oxidation furnace to ensure that the gas oxidation furnace stably operates at the methane concentration of about 1 percent and the temperature in the furnace of about 1000 ℃;
(2) drying hot air debugging: closing the drying hot blast valve 17, opening the functional smoke exhaust valve 13, sequentially opening the induced draft fan 6, the hot blast temperature regulating valve 12 and the oxygen-containing regulating valve 2, regulating by the control system, and opening the drying hot blast valve 17 and closing the functional smoke exhaust valve 13 when the functional oxygen sensor 15 and the functional temperature sensor 16 reach the set oxygen-containing concentration and temperature;
(3) and (4) normal operation: the drying hot air temperature sensor 18 and the drying hot air oxygen sensor 19 are put into operation, and the control system commands and adjusts the oxygen-containing regulating valve 2, the hot air temperature regulating valve 12 and the drying hot air valve 17 according to the monitored temperature and oxygen content so as to adapt to the change of working conditions and maintain the normal operation of the system;
(4) emergency handling and shutdown: when the system is out of control or normally shut down, the functional smoke exhaust valve 13 is opened and the drying hot blast valve 17 is closed in sequence, so that the heat stored in the gas oxidation furnace is dissipated.
Preferably, in the step 3, the normal operation is performed at a temperature of 700 ℃ while maintaining the oxygen content of the drying hot air to be not higher than 14%.
The working principle of the invention is as follows:
the concentration of methane entering the gas oxidation furnace is generally controlled to be about 1.0 percent, and the molecular formula of gas oxidation is' CH4+2O2=CO2+2H2O', the oxygen content of the flue gas after the primary oxidation reaction is reduced by 2%, and the content is generally about 19%. Through multiple backflow circulation of part of the flue gas, the oxygen content of the flue gas is continuously reduced. In actual operation, the low-temperature smoke of the oxidation furnace with lower oxygen content is recycled by adjusting reflux, the oxygen content of hot air output by the oxidation furnace for drying coal slime is controlled below 14%, and the deflagration phenomenon in the roller dryer is avoided. The specific implementation mode is as follows: firstly, a backflow pipeline and an adjusting valve are arranged between a low-temperature chimney of a gas oxidation furnace and an inlet of a blower, part of low-temperature exhaust gas of the oxidation furnace is sucked by the blower and is mixed with gas to be oxidized in the oxidation furnace; second, in the low temperature chimney and hot air temperature adjusting box of the gas oxidation ovenA temperature adjusting pipeline, an adjusting valve and a draught fan are arranged in the room, the low-temperature flue gas of the oxidation furnace is sent to a hot air temperature adjusting box, and is mixed with high-temperature hot air from the oxidation furnace for cooling, and the oxygen content is reduced in an auxiliary manner. And controlling the content of hot air entering the coal slime drum dryer within a set safety range through multiple circulation and control. The method not only reduces the oxygen content of the drying hot air, but also recycles part of heat of the low-temperature flue gas, thereby realizing the double effects of safety and energy conservation.
Embodiment 2, the difference of the apparatus for reducing the oxygen content of the hot air for drying the coal slime in the gas oxidation oven provided by the invention from embodiment 1 is as follows:
the hot air temperature regulating box 11 comprises an explosion venting hole plug 11.1, a high-temperature flue gas inlet 11.2, a low-temperature flue gas inlet 11.3, a metal shell 11.4, a high-temperature flue gas outlet 11.5, a heat insulating layer 11.6, a drying hot air outlet 11.7 and an inner surface ceramic coating layer 11.8, wherein the metal shell 11.4 is of a cylindrical structure, the heat insulating layer 11.6 is arranged on the outer side, the explosion venting hole plug 11.1 is arranged at one end of the metal shell, the drying hot air outlet 11.7 is arranged at the other end of the metal shell, and the high-temperature flue gas inlet 11.2, the low-temperature flue gas inlet 11.3 and the high-temperature flue gas outlet 11..
Wherein, the high temperature flue gas inlet 11.2 is an inclined hole inclined at a certain angle, and the low temperature flue gas inlet 11.3 and the high temperature flue gas outlet 11.5 are vertical holes. In addition, the metal shell 11.4 is formed by welding metal steel plates, an inner surface ceramic coating layer 11.8 is arranged on the inner layer of the metal shell 11.4, the heat preservation layer 11.6 is made of a high-alumina ceramic fiber folding module, and the explosion venting plug 11.1 is made of an explosion venting sheet and the high-alumina ceramic fiber folding module.
The high-temperature flue gas inlet direction and the hot air temperature regulating box form a certain angle and tend to a drying hot air outlet, the low-temperature flue gas inlet direction is vertical to the hot air temperature regulating box, so that the high-temperature flue gas and the low-temperature flue gas are favorably and uniformly mixed, the high-temperature flue gas outlet is close to the drying hot air outlet and is vertical to the hot air temperature regulating box, and the explosion venting hole plug and the drying hot air outlet are oppositely arranged, so that possible explosion pressure waves in the roller dryer can be quickly released; the inner surface ceramic coating layer plays the roles of corrosion resistance and prevention of scouring of high-temperature airflow to the heat insulation layer.
The above description is only a few of the preferred embodiments of the present invention, and any person skilled in the art may modify the above-described embodiments or modify them into equivalent ones. Therefore, any simple modifications or equivalent substitutions made in accordance with the technical solution of the present invention are within the scope of the claims of the present invention.
Claims (9)
1. The utility model provides a reduce device of hot-blast oxygen content of gas oxidation oven stoving coal slime, characterized by: the system comprises a gas oxidation system, a drying hot air oxygen content control system, a drying hot air temperature control system and an equipment start-stop and drying hot air conveying operation system, wherein a gas pipeline (1) is connected with an inlet of a blower (4), and an outlet of the blower (4) is sequentially connected with an inlet of a reversing valve (7) and a gas oxidation furnace (8); the outlet of the reversing valve (7) is connected with an oxidation furnace chimney (5), and the mechanisms form a gas oxidation system; the two ends of the backflow pipeline (3) are connected with a gas pipeline (1) and an oxidation furnace chimney (5), an oxygen-containing regulating valve (2) is arranged in the middle, and the mechanisms form a drying hot air oxygen content control system;
the two ends of the temperature adjusting pipeline (10) are connected with an oxidation furnace chimney (5) and a hot air temperature adjusting valve (12), wherein an induced draft fan (6) is arranged at the side close to the oxidation furnace chimney (5), the hot air temperature adjusting valve (12) is arranged at the side close to the hot air temperature adjusting box (11), the two ends of the high-temperature hot air pipeline (9) are connected with a gas oxidation furnace (8) and the hot air temperature adjusting box (11), and the mechanisms form a drying hot air temperature control system and assist in controlling the oxygen content;
the functional chimney (14) is connected with the hot air temperature regulating box (11), and the functional chimney (14) is provided with a functional smoke exhaust valve (13), a functional oxygen sensor (15) and a functional temperature sensor (16); the outlet of the hot air temperature regulating box (11) is sequentially connected with a drying hot air valve (17) and a hot air pipeline (20), a drying hot air temperature sensor (18) and a drying hot air oxygen sensor (19) are arranged on the hot air pipeline (20), and the mechanisms form an equipment start-stop and drying hot air conveying operation system.
2. The apparatus for reducing oxygen content of hot air for drying coal slime in a gas oxidation oven as claimed in claim 1, wherein: under the suction action of the blower (4), part of low-temperature flue gas in the oxidation furnace chimney (5) is mixed with coal mine gas and then oxidized in the gas oxidation furnace (8), the backflow quantity is adjusted through the oxygen-containing adjusting valve (2), and the requirement of the oxygen content of the drying hot air is met through repeated circulation control.
3. The apparatus for reducing oxygen content of hot air for drying coal slime in a gas oxidation oven as claimed in claim 1, wherein: the induced draft fan (6) is used as power to be adjusted through the temperature adjusting pipeline (10) and the hot air temperature adjusting valve (12), low-temperature flue gas is sent into the hot air temperature adjusting box (11), the temperature of high-temperature flue gas from the gas oxidation furnace (8) is reduced, and meanwhile, the oxygen content of hot air for drying coal slime can be reduced in an auxiliary mode.
4. The apparatus for reducing oxygen content of hot air for drying coal slime in a gas oxidation oven as claimed in claim 1, wherein: function smoke damper (13), function chimney (14), function oxygen sensor (15), function temperature sensor (16) constitute equipment and open and stop operating system, install function smoke damper (13), function oxygen sensor (15) and function temperature sensor (16) on function chimney (14), install on hot-blast thermoregulation box (11) function chimney (14), drying system can realize the preset of hot-blast oxygen content of stoving and temperature before the work, when drying system trouble or shut down, also can discharge the heat of saving in the gas oxidation stove.
5. The apparatus for reducing oxygen content of hot air for drying coal slime in a gas oxidation oven as claimed in claim 1, wherein: hot-blast thermoregulation box (11) including let out explode hole plug (11.1), high temperature flue gas import (11.2), low temperature flue gas import (11.3), metal casing (11.4), high temperature exhanst gas outlet (11.5), heat preservation (11.6), stoving exhanst gas outlet (11.7), metal casing (11.4) are the tubular structure, are equipped with heat preservation (11.6) in the outside, one end is equipped with lets out explode hole plug (11.1), and the other end is equipped with stoving exhanst gas outlet (11.7), is equipped with high temperature flue gas import (11.2), low temperature flue gas import (11.3) and high temperature exhanst gas outlet (11.5) in proper order on metal casing (11.4).
6. The apparatus for reducing oxygen content of hot air for drying coal slime in a gas oxidation oven as claimed in claim 5, wherein: the high-temperature flue gas inlet (11.2) is an inclined hole inclined at a certain angle, and the low-temperature flue gas inlet (11.3) and the high-temperature flue gas outlet (11.5) are vertical holes.
7. The apparatus for reducing oxygen content of hot air for drying coal slime in a gas oxidation oven as claimed in claim 5, wherein: the inner layer of the metal shell (11.4) is provided with an inner surface ceramic coating layer (11.8).
8. The use method of the device for reducing the oxygen content of the hot air for drying the coal slime in the gas oxidation oven as claimed in the claims 1 to 7 is characterized by comprising the following processes:
(1) preparation work: igniting and starting the gas oxidation furnace to ensure that the gas oxidation furnace stably operates at the methane concentration of about 1 percent and the temperature in the furnace of about 1000 ℃;
(2) drying hot air debugging: closing the drying hot blast valve (17), opening the functional smoke exhaust valve (13), sequentially opening the induced draft fan (6), the hot blast temperature adjusting valve (12) and the oxygen-containing adjusting valve (2), adjusting by the control system, and opening the drying hot blast valve (17) and closing the functional smoke exhaust valve (13) when the functional oxygen sensor (15) and the functional temperature sensor (16) reach the set oxygen-containing concentration and temperature;
(3) and (4) normal operation: the drying hot air temperature sensor (18) and the drying hot air oxygen sensor (19) are put into operation, and the control system commands and adjusts the oxygen-containing regulating valve (2), the hot air temperature regulating valve (12) and the drying hot air valve (17) according to the monitored temperature and oxygen content so as to adapt to the change of working conditions and maintain the normal operation of the system;
(4) emergency handling and shutdown: when the system is out of control or normally shut down, the functional smoke exhaust valve (13) is opened and the drying hot blast valve (17) is closed in sequence to release the heat stored in the gas oxidation furnace.
9. The use method of the device for reducing the oxygen content of the hot air for drying the coal slime in the gas oxidation oven as claimed in claim 8 is characterized in that: and step 3, in normal operation, the normal operation is carried out at the temperature of 700 ℃ while the oxygen content of the drying hot air is not higher than 14%.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112484435A (en) * | 2020-11-30 | 2021-03-12 | 海隆石油产品技术服务（上海）有限公司 | Hot air drying type powder coating drying device and powder coating drying method |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007021384A (en) * | 2005-07-15 | 2007-02-01 | Renaissance Energy Investment:Kk | Decomposition method of low-concentration methane |
| CN101915502A (en) * | 2010-08-25 | 2010-12-15 | 丰城市宏成金属制品有限公司 | Method for regulating oxygen atmosphere in fuel oil (gas) reverberatory furnace by using recovered fume |
| US20110250115A1 (en) * | 2008-12-17 | 2011-10-13 | Shengli Oilfield Shengli Power Machinery Co., Ltd. | Method and abatement device to destroy low-concentration coalmine methane |
| CN204718348U (en) * | 2015-05-18 | 2015-10-21 | 上海褐美能源科技有限公司 | High-temperature hot-air and coal slime drying control system are produced in coal mine light concentration mash gas oxidation |
| CN110174021A (en) * | 2019-05-28 | 2019-08-27 | 浙江亿扬能源科技有限公司 | A kind of waste heat comprehensive utilization system and operation method for realizing the drying of coal mine wet stock using low concentration gas |
| CN209654080U (en) * | 2018-12-29 | 2019-11-19 | 浙江亿扬能源科技有限公司 | A kind of pit shaft heat-insulation system using idle air and low concentration gas oxidation heat source |
| CN209655764U (en) * | 2018-12-29 | 2019-11-19 | 浙江亿扬能源科技有限公司 | A kind of coal slime drying system using idle air and mash gas extraction oxidation heat source |
-
2020
- 2020-02-11 CN CN202010085891.0A patent/CN111141138B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007021384A (en) * | 2005-07-15 | 2007-02-01 | Renaissance Energy Investment:Kk | Decomposition method of low-concentration methane |
| US20110250115A1 (en) * | 2008-12-17 | 2011-10-13 | Shengli Oilfield Shengli Power Machinery Co., Ltd. | Method and abatement device to destroy low-concentration coalmine methane |
| CN101915502A (en) * | 2010-08-25 | 2010-12-15 | 丰城市宏成金属制品有限公司 | Method for regulating oxygen atmosphere in fuel oil (gas) reverberatory furnace by using recovered fume |
| CN204718348U (en) * | 2015-05-18 | 2015-10-21 | 上海褐美能源科技有限公司 | High-temperature hot-air and coal slime drying control system are produced in coal mine light concentration mash gas oxidation |
| CN209654080U (en) * | 2018-12-29 | 2019-11-19 | 浙江亿扬能源科技有限公司 | A kind of pit shaft heat-insulation system using idle air and low concentration gas oxidation heat source |
| CN209655764U (en) * | 2018-12-29 | 2019-11-19 | 浙江亿扬能源科技有限公司 | A kind of coal slime drying system using idle air and mash gas extraction oxidation heat source |
| CN110174021A (en) * | 2019-05-28 | 2019-08-27 | 浙江亿扬能源科技有限公司 | A kind of waste heat comprehensive utilization system and operation method for realizing the drying of coal mine wet stock using low concentration gas |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112484435A (en) * | 2020-11-30 | 2021-03-12 | 海隆石油产品技术服务（上海）有限公司 | Hot air drying type powder coating drying device and powder coating drying method |
| CN112484435B (en) * | 2020-11-30 | 2022-05-10 | 海隆石油产品技术服务（上海）有限公司 | Hot air drying type powder coating drying device and powder coating drying method |
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