CN215560067U - Sectional type pyrolysis system - Google Patents
Sectional type pyrolysis system Download PDFInfo
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- CN215560067U CN215560067U CN202120920888.6U CN202120920888U CN215560067U CN 215560067 U CN215560067 U CN 215560067U CN 202120920888 U CN202120920888 U CN 202120920888U CN 215560067 U CN215560067 U CN 215560067U
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Abstract
The utility model discloses a sectional type pyrolysis system, which comprises a storage bin, a first gate valve, a feeding screw, a first section pyrolysis furnace, a first air distribution machine, a first material guide pipe, a second gate valve, a second section pyrolysis furnace, a second air distribution machine, a second material guide pipe, a third gate valve, a third section pyrolysis furnace, a third air distribution machine, a slag discharge screw, a condensation system, a tail gas treatment system and a hot blast furnace; the first section of pyrolysis furnace feed inlet links to each other with the feed bin, the second section of pyrolysis furnace feed inlet is connected with first section of pyrolysis furnace discharge gate through first passage, the third section of pyrolysis furnace feed inlet is connected with second section of pyrolysis furnace discharge gate through the second passage, and the hot-blast furnace carries the high temperature flue gas that produces to tail gas processing system after supplying heat respectively in proper order through the pipeline. The utility model stabilizes the pyrolysis process of the solid waste, separates the compound containing the chloride ions from the pyrolysis product, and realizes gradient utilization of the heat of the high-temperature flue gas, thereby reducing the manufacturing cost and prolonging the service life of the equipment.
Description
Technical Field
The utility model relates to the field of thermochemical conversion of organic solid wastes, in particular to a sectional type pyrolysis system.
Background
At present, the solid waste is pyrolyzed by using a rotary kiln at home and abroad, the main process is intermittent and continuous, two types of furnaces have own characteristics in the actual treatment process, the intermittent pyrolysis furnace can only treat a certain amount of solid waste each time, the time is long, and the energy consumption is high in the process of stopping and heating; compared with an intermittent pyrolysis furnace, the continuous pyrolysis furnace can continuously feed materials, the material handling capacity is large, the material handling time per ton is short, the energy consumption is lower in the process that no shutdown is performed in the middle, but when the components of the materials entering the furnace are complex, the water content is high, and the property difference is large, the pyrolysis efficiency is rapidly reduced, the materials which are not completely pyrolyzed are easily coked in the furnace, a plate is blocked in the pyrolysis process, and more heat is consumed due to the high water content; under the condition of high temperature, the water vapor can affect the structural stability of equipment materials, so that the service life of the equipment is affected, and the industrial research shows that the materials with higher water content need to be dried before the materials are pyrolyzed; secondly, pyrolysis gas condensation that the pyrolysis in-process produced generates pyrolysis liquid, and pyrolysis liquid composition is complicated, and when the material contained chlorine element, chlorine element mixed formed corrosive liquid in the pyrolysis liquid, and chloride ion mainly has two aspects to the corruption of stainless steel: firstly, the passive film is damaged; secondly, the pH value is reduced. In environments with lower PH, stainless steel will be more sensitive to chloride ions, which are the main cause of metal pitting, crevice corrosion, stress corrosion and selective corrosion. Most stainless steels cannot be used when the chloride ion content reaches 2%, and chlorobutyl rubber, glass flake lining or other corrosion-resistant materials are selected. In summary, one problem associated with high levels of chloride ion in slurries is that corrosion of tanks, piping and equipment in contact with the slurry necessitates the use of higher grade corrosion resistant materials and equipment, which increases capital investment. Pyrolysis liquid is not easy to separate, so that equipment is corroded and loses efficacy, and the service life of the equipment is shortened.
How to improve the stability of pyrolysis equipment and separate and treat compounds containing chloride ions is a problem to be solved in the pyrolysis treatment of solid wastes.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a sectional type pyrolysis system which is suitable for pyrolysis or gasification treatment of solid waste, so that the pyrolysis process of the solid waste is kept stable, a compound containing chloride ions and a pyrolysis product are separated, the temperature rise process of the solid waste is uniformly heated, coking is reduced, and the pyrolysis efficiency is effectively improved.
The design idea of the utility model is that a rotary kiln pyrolysis device is respectively formed by connecting three pyrolysis furnaces in series, wherein the first stage pyrolysis furnace is mainly used for evaporating moisture in materials and conveying the materials to the outside through a pipeline; the second stage pyrolysis furnace is mainly used for primarily pyrolyzing the materials, evaporating most of the compounds containing chloride ions in the materials in a steam form, adsorbing the compounds by adding a medicament (such as lime) or separately collecting the compounds by using an adsorbent; the third section of the pyrolysis furnace is used for complete pyrolysis, and residual materials are subjected to complete pyrolysis to generate pyrolytic carbon and pyrolysis gas.
In order to solve the technical problems, the technical scheme adopted by the utility model is as follows: a sectional type pyrolysis system comprises a storage bin, a first gate valve, a feeding screw, a first section pyrolysis furnace, a first air distribution machine, a first material guide pipe, a second gate valve, a second section pyrolysis furnace, a second air distribution machine, a second material guide pipe, a third gate valve, a third section pyrolysis furnace, a third air distribution machine, a slag spiral, a condensing system, a tail gas treatment system and a hot blast furnace; the feeding hole of the first section of pyrolysis furnace is connected with the bin, and the first gate valve is arranged at the feeding hole of the first section of pyrolysis furnace; the first air distribution machine is connected with the first section of the pyrolysis furnace, and cold air is introduced to control the temperature in the first section of the pyrolysis furnace; the feeding hole of the second section of pyrolysis furnace is connected with the discharging hole of the first section of pyrolysis furnace through a first material guide pipe, and a second gate valve is arranged at the feeding hole of the second section of pyrolysis furnace; the second air distribution machine is connected with the second section pyrolysis furnace, and cold air is introduced to control the temperature in the second section pyrolysis furnace; the third section of pyrolysis furnace feed inlet is connected with the second section of pyrolysis furnace discharge outlet through a second material guide pipe, and a third gate valve is arranged at the third section of pyrolysis furnace feed inlet; the third air distribution machine is connected with the third section of the pyrolysis furnace, and cold air is introduced to control the temperature in the third section of the pyrolysis furnace; the cooling system is connected with an air outlet of the third section of the pyrolysis furnace, and pyrolysis gas generated by pyrolysis of the third section of the pyrolysis furnace enters the condensing system through a pipeline and is conveyed to the hot blast stove for combustion and heat supply; the slag discharge spiral is connected with a discharge hole of a third section of pyrolysis furnace, and pyrolysis slag generated by pyrolysis of the third section of pyrolysis furnace is cooled and output through the slag discharge spiral; the hot blast stove supplies heat to the third section pyrolysis furnace, the second section pyrolysis furnace and the first section pyrolysis furnace respectively in sequence through pipelines, and then conveys the heat to a tail gas treatment system.
Further, the second section pyrolysis furnace is provided with an adding port, and a medicament is added through the adding port to be adsorbed with materials in the furnace.
Further, the medicament may be lime.
Further, the slag spiral cooling medium is water. The spiral area of slagging tap self seals, when the spiral of slagging tap discharged material, can keep apart the air of arranging the material exit end and air in the stove.
Further, still include carbon sediment case, carbon sediment case with the spiral discharge gate of slagging tap is connected.
Furthermore, the temperature in the third section pyrolysis furnace is 300-650 ℃, the temperature in the second section pyrolysis furnace is 120-200 ℃, and the temperature in the first section pyrolysis furnace is 100-120 ℃.
Compared with the prior art, the utility model has the beneficial effects that:
(1) the sectional type pyrolysis system improves the stability of the pyrolysis process of the solid waste, the first-stage pyrolysis furnace evaporates moisture in the material, and most of the moisture is conveyed to the temporary storage tank through a pipeline for further treatment; after moisture in the materials is evaporated, the materials carry partial heat to enter a second-stage pyrolysis furnace, and partial material coking or plate formation caused by sudden temperature drop of a cylinder in the second-stage pyrolysis furnace can be avoided, so that the pyrolysis of the materials is facilitated, the second-stage pyrolysis furnace is provided with an adding port, lime medicament is added through the adding port and is adsorbed with chloride ions in the materials in the furnace, the materials are prevented from directly entering a third-stage pyrolysis furnace, the content of the chloride ions in pyrolysis liquid is reduced, compounds containing the chloride ions are evaporated and collected in a steam form by the second-stage pyrolysis furnace, and the corrosion damage of the compounds containing the chloride ions to subsequent equipment is reduced; the pyrolysis liquid generated by the third section of pyrolysis furnace contains almost no water and no chlorine, and the workload and the cost of subsequent oil-liquid separation are reduced.
(2) The non-condensable gas can be conveyed to the hot blast stove for combustion after being purified by the condensing system, the generated high-temperature flue gas supplies heat to the pyrolysis device, the high-temperature flue gas sequentially supplies heat to the third section pyrolysis furnace, the second section pyrolysis furnace and the first section pyrolysis furnace, the heat is utilized in a gradient manner, and the heat utilization rate is high.
(3) The equipment has different sectional heating temperatures of the pyrolysis furnace, and the inner cylinder of the pyrolysis furnace is made of different resistant materials, so that the manufacturing cost and the replacement cost of damaged accessories are reduced integrally, and the service life of the equipment is prolonged.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the utility model and, together with the description, serve to explain the utility model and not to limit the utility model. In the drawings:
FIG. 1 is a process flow diagram of a staged pyrolysis system;
FIG. 2 is a perspective view of a pyrolysis furnace of a staged pyrolysis system;
FIG. 3 is a front view of a pyrolysis furnace of a staged pyrolysis system;
FIG. 4 is a top view of a pyrolysis furnace of a staged pyrolysis system;
FIG. 5 is a view showing the connection structure of the material guiding pipes of the sectional type pyrolysis system;
FIG. 6 is a sectional view showing the connection of the guide tubes of the staged pyrolysis system;
FIG. 7 is a front view of a connecting material guide tube of a sectional type pyrolysis system;
description of reference numerals: 1. the system comprises a storage bin, 2, a lifter, 3, a first gate valve, 4, a feeding screw, 5, a first section pyrolysis furnace, 6, a first air distribution machine, 7, a first material guide pipe, 8, a second gate valve, 9, a second section pyrolysis furnace, 10, a second air distribution machine, 11, a second material guide pipe, 12, a third gate valve, 13, a third section pyrolysis furnace, 14, a third air distribution machine, 15, a slag discharge screw, 16, a condensation system, 17, a tail gas treatment system, 18, a hot blast stove, 19, an addition port, 51, a feeding port, 52, a discharge port, 53, a pyrolysis gas outlet, 54, an outer barrel, 55, an inner barrel, 56, a flue gas inlet, 57, a flue gas outlet, 70, a material guide pipe, 71, a dynamic seal and 72, a spiral blade
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
The utility model is further explained by combining the attached drawings, and the process flow chart of the sectional type pyrolysis system shown in figure 1 is as follows:
the utility model provides a sectional type pyrolysis system, which comprises the steps of firstly opening a natural gas pipeline valve, operating a hot blast stove, igniting and burning a burner to generate high-temperature flue gas, enabling the high-temperature flue gas to enter an interlayer of a third section of pyrolysis furnace, controlling the temperature in the third section of pyrolysis furnace to be 300-650 ℃ through a third air distribution fan, enabling the high-temperature flue gas to heat the third section of pyrolysis furnace, enabling the high-temperature flue gas to enter the interlayer of a second section of pyrolysis furnace through an outer cylinder upper pipeline to continuously heat the inner cylinder of the second section of pyrolysis furnace, controlling the temperature in the second section of pyrolysis furnace to be 120-200 ℃ through the second air distribution fan, heating the inner cylinder of the second section of pyrolysis furnace through the high-temperature flue gas, enabling the high-temperature flue gas to enter a tail gas treatment device through a pipeline to continuously heat, controlling the temperature in the first section of pyrolysis furnace to be within 120 ℃ through the first air distribution fan, and finally enabling the high-temperature flue gas to enter a tail gas treatment device to reach the standard and be discharged.
After materials are pretreated, the materials are stacked in a storage bin by using a forklift or a crane, the materials are sent into a hopper through a lifting machine, the outlet of the hopper is connected with a feeding screw, the feeding screw sends the materials into a first section pyrolysis furnace inner cylinder, a second gate valve is closed, after a certain amount of materials are sent, the lifting machine, the first gate valve and the feeding screw are closed, the first section pyrolysis furnace inner cylinder is rotated, a first air distribution machine is adjusted to enable the temperature in the first section pyrolysis furnace to be within 120 ℃, moisture in the materials is evaporated in the first section pyrolysis furnace, and water vapor enters a collection container through a pipeline; and then carrying out next treatment, through a sight glass or other visual operations, when confirming that the amount of generated water vapor in the first section of pyrolysis furnace is less, opening the second gate valve, sending the material into the second section of pyrolysis furnace through the first material guide pipe in the connecting pipeline, closing the second gate valve after the material in the first section of pyrolysis furnace is basically transferred, opening the elevator, the first gate valve and the feeding screw, and continuing feeding the first section of pyrolysis furnace.
And (3) the material enters a second section of pyrolysis furnace for pyrolysis, a third gate valve is closed, a second air distribution machine is opened, the frequency of the second air distribution machine is adjusted, the temperature of the inner cylinder of the second section of pyrolysis furnace is 120-200 ℃, most of compounds containing chloride ions can be evaporated in a steam form, and are adsorbed by adding a medicament, wherein the conventionally added medicament is lime. Other adsorbents can be added for separate collection and disposal; and when the pressure value in the inner cylinder of the second section of pyrolysis furnace is reduced to be close to the normal pressure and the fluctuation of the pressure value is not large, opening the third gate valve, and sending the incompletely pyrolyzed materials into the third section of pyrolysis furnace to finish the preliminary pyrolysis of the materials. And (4) after most of the materials in the second section of pyrolysis furnace are conveyed, closing the third gate valve and waiting for the incoming materials of the first section of pyrolysis furnace.
After most of materials in the second section of the pyrolysis furnace are conveyed, closing the third gate valve, opening the third air distribution fan, adjusting the frequency of the third air distribution fan to enable the temperature of the inner cylinder of the third section of the pyrolysis furnace to be within 300-650 ℃, generating pyrolysis gas and pyrolysis slag, enabling the pyrolysis gas to enter a condensation system through a pipeline at the rear end of the furnace body, conveying the non-condensable gas purified by the condensation system to a hot blast stove for combustion, and supplying heat to the pyrolysis device by the generated high-temperature flue gas; and the pyrolysis slag is cooled and output through a slag discharge spiral and enters a carbon slag box.
The pyrolysis furnace structure shown in fig. 2, 3 and 4 comprises a feed inlet, a discharge outlet, a pyrolysis gas outlet, an outer cylinder, an inner cylinder, a flue gas inlet and a flue gas outlet, wherein the feed inlet is arranged at one end of the inner cylinder, is spirally connected with a feed, and feeds materials into the inner cylinder of the pyrolysis furnace; the discharge port is arranged at the other end of the inner cylinder and is spirally connected with a discharge material, and the material is sent into the inner cylinder of the pyrolysis furnace in the next working procedure or discharged; the pyrolysis gas outlet is arranged on the cover plate of the discharge port and discharges pyrolysis gas generated by the material in the inner cylinder of the pyrolysis furnace; the outer cylinder is arranged on the outer side of the inner cylinder and is connected with the inner cylinder in a sealing way, the inner cylinder is driven by the driving mechanism to rotate, a gap interlayer is arranged between the outer cylinder and the inner cylinder, and the flue gas inlet is arranged on the outer cylinder at the discharge port end; the flue gas outlet is arranged on the outer cylinder at the feed inlet end; high-temperature flue gas generated by combustion of the hot blast stove enters the gap interlayer from the flue gas inlet and is discharged from the flue gas outlet.
The material guiding pipe connecting structure shown in fig. 5, 6 and 7 comprises a dynamic seal and a helical blade, wherein the helical blade is arranged in a hollow material guiding pipe, and when the material guiding pipe connecting structure works, the rear end material is extruded and pushes the front end material to move forwards along the helical blade to enter a next section of the pyrolysis furnace; and a dynamic seal is arranged between the two sections of the material guide pipes which are connected, and the dynamic seal plays a role in sealing connection.
The sectional type pyrolysis system is applied to pyrolysis treatment of solid wastes, improves the stability of the pyrolysis process of the solid wastes, realizes gradient utilization of high-temperature flue gas heat and has high heat utilization rate; each pyrolysis furnace selects different inner cylinder materials according to the use temperature, the inner cylinders of the first section pyrolysis furnace and the second section pyrolysis furnace are made of 304 stainless steel materials, and the inner cylinders of the third section pyrolysis furnace are made of 310s stainless steel materials, so that the manufacturing cost and the replacement cost of damaged accessories are reduced on the whole; the second-stage pyrolysis furnace evaporates and collects the compounds containing the chloride ions in the form of steam, so that the corrosion damage of the compounds containing the chloride ions to subsequent equipment is reduced, and the service life of the equipment is prolonged.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (6)
1. A segmented pyrolysis system, comprising: the device comprises a storage bin, a first gate valve, a feeding screw, a first section of pyrolysis furnace, a first air distribution machine, a first material guide pipe, a second gate valve, a second section of pyrolysis furnace, a second air distribution machine, a second material guide pipe, a third gate valve, a third section of pyrolysis furnace, a third air distribution machine, a slag spiral, a condensing system, a tail gas treatment system and a hot blast furnace; the feeding hole of the first section of pyrolysis furnace is connected with the bin, and the first gate valve is arranged at the feeding hole of the first section of pyrolysis furnace; the first air distribution machine is connected with the first section of the pyrolysis furnace, and cold air is introduced to control the temperature in the first section of the pyrolysis furnace; the feeding hole of the second section of pyrolysis furnace is connected with the discharging hole of the first section of pyrolysis furnace through a first material guide pipe, and a second gate valve is arranged at the feeding hole of the second section of pyrolysis furnace; the second air distribution machine is connected with the second section pyrolysis furnace, and cold air is introduced to control the temperature in the second section pyrolysis furnace; the third section of pyrolysis furnace feed inlet is connected with the second section of pyrolysis furnace discharge outlet through a second material guide pipe, and a third gate valve is arranged at the third section of pyrolysis furnace feed inlet; the third air distribution machine is connected with the third section of the pyrolysis furnace, and cold air is introduced to control the temperature in the third section of the pyrolysis furnace; the condensing system is connected with an air outlet of the third section of the pyrolysis furnace, and pyrolysis gas generated by pyrolysis of the third section of the pyrolysis furnace enters the condensing system through a pipeline and is conveyed to the hot blast stove for combustion and heat supply; the slag discharge spiral is connected with a discharge hole of a third section of pyrolysis furnace, and pyrolysis slag generated by pyrolysis of the third section of pyrolysis furnace is cooled and output through the slag discharge spiral; the hot blast stove supplies heat to the third section pyrolysis furnace, the second section pyrolysis furnace and the first section pyrolysis furnace respectively in sequence through pipelines, and then conveys the heat to a tail gas treatment system.
2. The segmented pyrolysis system of claim 1, wherein: the second section of pyrolysis furnace is provided with an adding port, and a medicament is added through the adding port.
3. The segmented pyrolysis system of claim 2, wherein: the medicament is lime.
4. The segmented pyrolysis system of claim 1, wherein: the slag spiral cooling medium is water.
5. The segmented pyrolysis system of claim 4, wherein: still include the carbon sediment case, the carbon sediment case with the spiral discharge gate of slagging tap is connected.
6. The segmented pyrolysis system of claim 1, wherein: the temperature in the third section pyrolysis furnace is 300-650 ℃, the temperature in the second section pyrolysis furnace is 120-200 ℃, and the temperature in the first section pyrolysis furnace is 100-120 ℃.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120920888.6U CN215560067U (en) | 2021-04-29 | 2021-04-29 | Sectional type pyrolysis system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120920888.6U CN215560067U (en) | 2021-04-29 | 2021-04-29 | Sectional type pyrolysis system |
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| CN215560067U true CN215560067U (en) | 2022-01-18 |
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