CN213977536U - Novel secondary smoke recycling and dry distillation device for carbonization rotary kiln - Google Patents
Novel secondary smoke recycling and dry distillation device for carbonization rotary kiln Download PDFInfo
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- CN213977536U CN213977536U CN202022257557.7U CN202022257557U CN213977536U CN 213977536 U CN213977536 U CN 213977536U CN 202022257557 U CN202022257557 U CN 202022257557U CN 213977536 U CN213977536 U CN 213977536U
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Abstract
The utility model discloses a novel carbonization rotary kiln flue gas secondary recovery dry distillation device, dry distillation device utilizes just leading combustion chamber to retrieve the flue gas and carries out the postcombustion. The flowing direction of the carbonization furnace tail gas in the return process is sequentially provided with a flue gas pipeline, a decoking pool, a high-temperature and high-pressure resistant fan, an oxygen supplementing fan, an ignition assembly and a front-mounted combustion device. The utility model discloses an increase a leading combustion chamber at retort discharge end, one set of flue gas is carried, ignition, can be with in the tail gas combustible gas postcombustion exothermic to provide the retort plant use with burning heat energy, realize that the product carries out the dry distillation (also form smoldering) under the condition of isolated air.
Description
Technical Field
The invention relates to the field of activated carbon production, in particular to a novel tail gas secondary recovery dry distillation device of a carbonization rotary kiln, which is a utilization device for utilizing a front-mounted incineration chamber to recover smoke and perform secondary combustion.
Background
In the production process of coal-based activated carbon, carbonization is one of the main heat treatment processes in the manufacturing process of activated carbon, most of non-carbon elements, namely hydrogen and oxygen, are firstly removed in a gas form due to the pyrolysis of raw materials in the carbonization process, and the released element carbon atoms are combined into an ordered crystal product which is generally called basic graphite microcrystal.
At present, the carbonization process of coal-based activated carbon is to heat raw materials to 550-650 ℃ in a carbonization furnace in an air-isolated manner for dry distillation, in the process, high-temperature flue gas generated by burning coal or natural gas and other fuels in a furnace end combustion chamber is introduced into the carbonization furnace through an induced draft fan matched with the carbonization furnace, so that the carbonization furnace forms a temperature gradient from the furnace end to the furnace tail, and the requirements of the carbonization process are met. The active carbon raw material is acted by temperature in the carbonization process, and thermal decomposition reaction is carried out to generate a large amount of volatile substances. The smoke is yellow smoke, and the main components of the smoke are organic compounds such as benzene, naphthalene, phenanthrene, phenol, derivatives and the like. Usually, the flue gas is introduced into an incineration chamber for combustion, and then the generated high-temperature flue gas is introduced into a waste heat boiler for heat exchange to generate steam for the activation furnace.
On the other hand, the carbonization furnace needs to be supplemented with fuel to maintain the temperature of the furnace in the normal operation process, the requirements of environmental protection policies are continuously improved, the requirements of energy consumption in the production of the activated carbon are continuously reduced, and the current activated carbon industry needs a device for recycling flue gas from a front-mounted incineration chamber to perform secondary combustion. The carbonization tail gas is efficiently utilized, and the purposes of quality improvement and consumption reduction are achieved.
At present, some carbonization furnaces also adopt carbonized tail gas as a fuel to serve as a carbonization heat source, but the carbonization furnaces mainly used for biomass as raw materials have the advantages that the tail gas components generated in the carbonization process of the biomass raw materials are greatly different from coal-based activated carbon, the utilization rate of flue gas heat is low, and meanwhile, the pipelines cannot be corroded. In conclusion, the novel secondary smoke recovery and dry distillation device for the carbonization rotary kiln is designed.
Disclosure of Invention
In order to solve the problem that exists, the utility model provides a dry distillation device is retrieved to novel tail gas secondary of carbomorphism rotary kiln and utilization method, the dry distillation device utilizes leading combustion chamber to retrieve the flue gas and carries out the postcombustion to the high efficiency utilizes the sensible heat in the carbomorphism stove tail gas and the combustible gas's that contains in the tail gas combustion heat value, realizes energy saving and consumption reduction, reduction in production cost.
The utility model discloses a realize through following technical scheme:
a novel secondary smoke recovery and dry distillation device for a carbonization rotary kiln is characterized in that a front-mounted incineration chamber is used for recovering smoke for secondary combustion, and the device comprises a smoke pipeline, a decoking pool, a high-temperature and high-pressure resistant fan, an oxygen supplementing fan, an ignition assembly and a front-mounted combustion device which are sequentially arranged in the flowing direction of tail gas of a carbonization furnace in the return process; the tail gas outlet is connected to a settling chamber of the carbonization furnace through a flue gas pipeline and is used for collecting particles such as dust in the tail gas from the carbonization furnace; the high-temperature and high-pressure resistant fan, the oxygen supplementing fan and the ignition assembly are used for introducing tail gas of the carbonization furnace into the front combustion chamber of the carbonization furnace; the front combustion device is connected with the discharge end of the carbonization furnace and is used for combusting combustible substances in the tail gas of the carbonization furnace.
As a further optimization scheme of the utility model, the novel tail gas secondary recovery dry distillation device of the carbonization rotary kiln also comprises an explosion-proof valve, a gas check valve and an oxygen supplementing and air distributing device, wherein the explosion-proof valve is used for preventing gas from deflagrating in a pipeline and closing a gas pipeline; the gas check valve is used for preventing the combustible tail gas from flowing backwards; the oxygen supplementing and air distributing device is manually controlled and used for adjusting the oxygen supply of the gas combustion device according to the amount of the combustible tail gas.
As the utility model discloses a further optimization scheme, this novel tail gas secondary of carbomorphism rotary kiln retrieves dry distillation device, leading combustion chamber carries out the secondary tail gas and burns at retort discharge end position increase one combustion chamber. The front-mounted incineration chamber is built by refractory materials and is provided with an explosion-proof device, and comprises a flue gas combustion chamber and a high-temperature heat storage chamber. The combustion chamber is used for meeting the basic condition that the flue gas is completely combusted in the interval, through calculation, one third of the flue gas generated by the carbonization furnace is used for secondary return incineration, and the remaining two thirds of the flue gas enters the rear incineration chamber for heat exchange. The heat source after combustion is introduced into the regenerator. The high-temperature regenerator is used for sending a stable high-temperature heat source into the carbonization furnace to meet the thermal decomposition reaction of the carbonized material, and forming a good carbonization temperature gradient by adjusting the speed of the fan. The flue gas combustion chamber is used for pressurizing and heating mixed flue gas, then sending the mixed flue gas into an ignition device for ignition, and then rotating the mixed flue gas into the combustion chamber for incineration. The incinerated flue gas forms high-temperature heat energy to enter a high-temperature heat storage chamber, and heat storage checker bricks are filled in the high-temperature heat storage chamber. When the combustion of the flue gas in the combustion chamber is insufficient, the flue gas can enter the regenerator for further combustion. The purpose of the checker bricks is to absorb and release heat, which is released when the amount of exhaust gases in the combustion chamber decreases so that the temperature in the combustion chamber remains substantially constant. Those skilled in the art will appreciate that there are a variety of regenerators that can be used in the present invention, most effectively constructed from high alumina brick and clay brick refractory bricks.
As the utility model discloses a further optimization scheme, be equipped with the gas mixing chamber in the ignition, the combustible flue gas in with the pipeline heats once more, the pressurization forms high temperature flue gas and air mixing back in this interval, and this ignition's core equipment (helical fan) blows the flue gas rotation type after mixing to the combustion chamber and ignites the burning, forms rotatory flame.
As a further optimization scheme of the utility model, retort tail gas utilization method, include with tail gas is sent into foretell tail gas utilization device, so that retrieve heat in the retort tail gas of arranging, including sensible heat and latent heat.
As a further optimization scheme of the utility model, the method is particularly suitable for a coal activated carbon carbonization furnace, the tail gas of the coal activated carbon carbonization furnace contains water vapor and non-methane total hydrocarbons, and when the variety of the activated carbon produced in the carbonization furnace is changed, the content of combustible gas in the tail gas can fluctuate, according to the preferred implementation of the invention, the content of combustible gas in the tail gas is 30% (v/v) -45% (v/v), and the temperature is 550-650 ℃; in order to improve the combustion and heat utilization efficiency of combustible gas in the tail gas, when the tail gas quantity of the carbonization furnace is increased, the oxygen supply of the combustion chamber is increased; reducing the oxygen supply to the combustor when the exhaust flow is reduced.
Compared with the prior art, the beneficial effects of the utility model are that: the tail gas recovery device provided by the novel technology is mainly characterized in that a front-mounted incineration chamber is additionally arranged to enable tail gas combustible gas to be fully combusted and release heat, so that the high-efficiency utilization of tail gas waste heat is realized, the fuel consumption is reduced, and the environment-friendly production is realized; in addition, combustible substances in the tail gas are fully combusted through the incinerator by the air distribution adjusting device, and heat returns to the carbonization furnace to be fully utilized; in addition, in order to prevent the power failure caused by sudden accidents, the back fire of the incineration chamber and the explosion of the pipeline are caused, an explosion-proof port, a smoke valve and a one-way valve are further arranged, and the system safety is ensured.
Drawings
Fig. 1 is a schematic diagram of an embodiment of the present invention.
Fig. 2 is a schematic view of the flue gas duct of the present invention.
Fig. 3 is a structural section view of the present invention.
In the figure: 1. a carbonization furnace; 2. a decoking pool; 3. a high temperature and high pressure resistant fan; 4. a gas combustion device; 5. an explosion-proof valve; 6. a gas check valve; 7. a settling chamber; 8. a feed inlet; 9. a discharge port; 10. a regenerator; 11. a combustion chamber.
Detailed Description
The invention will be described in further detail with reference to the following detailed description and accompanying drawings:
as shown in fig. 1, a schematic diagram of a novel secondary flue gas recovery and dry distillation device of a carbonization rotary kiln, which is an embodiment of the novel secondary flue gas recovery and dry distillation device of a rotary carbonization furnace, wherein the carbonization furnace (1) is used for carbonizing an activated carbon raw material; the dry distillation device is used for recovering heat and chemical energy of combustible substances in tail gas discharged by the carbonization furnace (1), and comprises a decoking pool (2), a high-temperature and high-pressure resistant fan (3) and an ignition assembly (4) which are sequentially arranged along the flow direction of the tail gas; the decoking pool (2) is connected to an outlet at the lower part of a settling chamber (7) of the carbonization furnace (1) through a flue gas pipeline and is used for carrying out dust fall treatment on dust in tail gas from the carbonization furnace (1); and a feed inlet (8) is formed in the inner end surface of the settling chamber (7).
Draught fan (3) are used for with the tail gas of retort stove (1) is introduced the tail gas utilizes the device, then the warp draught fan (3) are finally carried to retort (1) in.
The gas combustion device (4) is connected to an outlet of the high-temperature and high-pressure resistant fan (3) through a flue gas pipeline and used for combusting combustible substances in tail gas of the carbonization furnace (1) and releasing heat to improve the temperature of the tail gas. Specifically, the gas combustion device (4) can comprise a combustion chamber (11) and an ignition assembly arranged outside the combustion chamber, wherein the ignition assembly is used for mixing and combusting tail gas and air; a regenerative chamber (10) is arranged on the inner side of the combustion chamber (11); the heat storage chamber (10) is connected to the discharge hole (9).
In a preferred embodiment, the combustion chamber (11) of the gas combustion device is filled with heat-accumulating checker bricks which absorb heat during combustion of the exhaust gas and release heat when the exhaust gas in the combustion chamber (11) is no longer combusted so that the temperature in the combustion remains substantially constant, for example above the ignition point of the combustible gas in the exhaust gas. It is further preferred that the heat storage blocks should have a large specific surface area to increase the heat absorption and release rates of the heat storage blocks, for example the heat storage checker bricks are provided with a cell structure. The person skilled in the art understands that the pre-incinerator used in the invention is built of refractory materials, and the heat storage is carried out by adding checker bricks, so that the problem that the flame in the combustion chamber (11) is difficult to reburn after being extinguished is avoided.
And tail gas which is combusted and heated in the gas combustion device (4) enters the carbonization furnace (1) for carbonizing materials.
In a preferred embodiment, the tail gas utilization device further comprises an air distribution adjusting device, and when the amount of the carbonization tail gas is increased, the air distribution adjusting device can increase the oxygen supply of the gas combustion device; when the amount of the carbonized tail gas is reduced, the oxygen supply of the gas combustion apparatus is reduced. Regarding the specific setting, it is necessary to determine the composition of the exhaust gas by study in consideration of combustion, thermal efficiency, and the like.
In a preferred embodiment, the tail gas utilization device further comprises an explosion-proof valve (5) and a gas check valve (6), wherein the explosion-proof valve (5) is arranged on a flue gas pipeline connecting the carbonization furnace (1) and the high-temperature and high-pressure resistant fan (3) to prevent gas deflagration. For example, the two ends of the gas check valve (6) are respectively connected with the high-temperature and high-pressure resistant fan (3) and the gas combustion device, so that the gas combustion device (4) is prevented from backfiring to cause gas pipeline explosion due to the fact that the high-temperature and high-pressure resistant fan (3) stops running (for example, power failure caused by an accident).
In the embodiment 1, a carbonization furnace with a single-furnace annual output of 5000 tons is taken as an example, the temperature of tail gas is 550-650 ℃, the content of combustible gas in the tail gas is about 35-45%, the tail gas is combusted in a device provided with a front-mounted incineration chamber, and in the process, the oxygen supply of the combustion chamber (11) is adjusted through an air distribution adjusting device.
According to the design, the annual running time of the production line is about 8000h, the fuel consumption can be reduced by 40 yuan per hour by calculating according to the current fuel coal price of 430 yuan/t of the price bureau, the annual consumption reduction can reach 32 ten thousand yuan, and the economic benefit is created.
In this embodiment, the novel operating principle is as follows: the ignition port of the front incineration chamber is ignited by natural gas and dried to 1000-1200 ℃, the discharging section of the carbonization furnace begins to put carbonized materials → the carbonized materials continuously generate combustible smoke when meeting heat energy → 1/3 smoke is pressurized and heated by a pipeline and enters the front incineration chamber for combustion → the heat energy after combustion enters the cylinder body of the carbonization furnace to participate in carbonization → 2/3 smoke directly enters the rear incineration chamber for heat exchange → the thickness of the material layer in the carbonization furnace, the concentration of the smoke and the temperature gradient meet the production process conditions, and then the natural gas heat source is removed → the carbonization furnace continuously produces to realize the self-heating balance and enter the benign circulation state.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (4)
1. The utility model provides a novel dry distillation device is retrieved to carbomorphism rotary kiln flue gas secondary, dry distillation device just utilizes leading combustion chamber to retrieve the flue gas and carries out the postcombustion, and the flow direction of flue gas in returning sets gradually flue gas pipeline, decoking pond, high temperature resistant high pressure positive blower, oxygenating fan, ignition assembly and leading burner, its characterized in that: the flue gas return refers to the collection of particulate matters such as dust and the like in the tail gas from the carbonization furnace at the position of a tail gas outlet of a settling chamber of the carbonization furnace connected with a flue gas pipeline; the high-temperature and high-pressure resistant fan, the oxygen supplementing fan and the ignition assembly form a device for introducing tail gas of the carbonization furnace into the front combustion chamber of the carbonization furnace; the front combustion chamber device is connected with the discharge end of the carbonization furnace and is used for combusting combustible substances in tail gas from the carbonization furnace.
2. The novel secondary smoke recovery and dry distillation device for the carbonization rotary kiln as claimed in claim 1, is characterized in that: the dry distillation device also comprises an explosion-proof valve, a gas check valve and an oxygen supplementing and air distributing device, wherein the explosion-proof valve is used for preventing gas from exploding in the pipeline and closing a gas pipeline; the gas check valve is used for preventing the combustible tail gas from flowing backwards; the oxygen supplementing and air distributing device is controlled by a frequency converter to adjust the oxygen supply of the combustion device.
3. The novel secondary smoke recovery and dry distillation device for the carbonization rotary kiln as claimed in claim 2, is characterized in that: the tail gas utilization device comprises a high-temperature high-pressure fan and an oxygen supplementing fan which are arranged on a flue gas pipeline; the ignition assembly is used for mixing the tail gas with air after the tail gas is pressurized and heated to ignite and burn.
4. The novel secondary smoke recovery and dry distillation device for the carbonization rotary kiln as claimed in claim 3, is characterized in that: the tail gas utilization device is additionally provided with a front-mounted incineration chamber for tail gas incineration, and checker bricks are additionally arranged for heat storage, so that the requirement that the high temperature of 1200 ℃ is kept at the node, cold air is prevented from entering the carbonization furnace, open fire is blocked, and smoldering is formed in the carbonization process.
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| CN202022257557.7U CN213977536U (en) | 2020-10-12 | 2020-10-12 | Novel secondary smoke recycling and dry distillation device for carbonization rotary kiln |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114034162A (en) * | 2021-12-06 | 2022-02-11 | 江苏龙净科杰环保技术有限公司 | Novel rotary kiln process |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114034162A (en) * | 2021-12-06 | 2022-02-11 | 江苏龙净科杰环保技术有限公司 | Novel rotary kiln process |
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