CN111895727A - Double-heat-source built-in hot low-rank lump coal drying furnace - Google Patents

Double-heat-source built-in hot low-rank lump coal drying furnace Download PDF

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Publication number
CN111895727A
CN111895727A CN202010625864.8A CN202010625864A CN111895727A CN 111895727 A CN111895727 A CN 111895727A CN 202010625864 A CN202010625864 A CN 202010625864A CN 111895727 A CN111895727 A CN 111895727A
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China
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flue gas
drying furnace
low
temperature flue
collecting box
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CN202010625864.8A
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Chinese (zh)
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惠建明
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WUXI YIEN TECHNOLOGY CO LTD
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WUXI YIEN TECHNOLOGY CO LTD
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Priority to CN202010625864.8A priority Critical patent/CN111895727A/en
Publication of CN111895727A publication Critical patent/CN111895727A/en
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26DRYING
    • F26BDRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B3/00Drying solid materials or objects by processes involving the application of heat
    • F26B3/02Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air
    • F26B3/06Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air the gas or vapour flowing through the materials or objects to be dried
    • F26B3/08Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air the gas or vapour flowing through the materials or objects to be dried so as to loosen them, e.g. to form a fluidised bed
    • F26B3/084Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air the gas or vapour flowing through the materials or objects to be dried so as to loosen them, e.g. to form a fluidised bed with heat exchange taking place in the fluidised bed, e.g. combined direct and indirect heat exchange
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26DRYING
    • F26BDRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
    • F26B21/001Drying-air generating units, e.g. movable, independent of drying enclosure
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26DRYING
    • F26BDRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
    • F26B21/004Nozzle assemblies; Air knives; Air distributors; Blow boxes
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26DRYING
    • F26BDRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
    • F26B21/06Controlling, e.g. regulating, parameters of gas supply
    • F26B21/10Temperature; Pressure
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26DRYING
    • F26BDRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B23/00Heating arrangements
    • F26B23/10Heating arrangements using tubes or passages containing heated fluids, e.g. acting as radiative elements; Closed-loop systems
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26DRYING
    • F26BDRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B25/00Details of general application not covered by group F26B21/00 or F26B23/00
    • F26B25/001Handling, e.g. loading or unloading arrangements
    • F26B25/002Handling, e.g. loading or unloading arrangements for bulk goods
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26DRYING
    • F26BDRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B25/00Details of general application not covered by group F26B21/00 or F26B23/00
    • F26B25/06Chambers, containers, or receptacles
    • F26B25/08Parts thereof
    • F26B25/12Walls or sides; Doors
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26DRYING
    • F26BDRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B25/00Details of general application not covered by group F26B21/00 or F26B23/00
    • F26B25/22Controlling the drying process in dependence on liquid content of solid materials or objects

Abstract

The invention discloses a double-heat-source built-in low-rank lump coal drying furnace, which comprises a membrane wall heating module arranged in the drying furnace, a high-temperature flue gas supply pipeline connected to the lower part of the drying furnace, and a low-temperature flue gas discharge pipeline arranged on the upper part of the drying furnace; the upper part of the drying furnace is provided with an annular air flue, and a low-temperature flue gas output port connected with a low-temperature flue gas discharge pipeline is arranged on the annular air flue; the membrane wall heating module comprises a plurality of membrane walls which are vertically arranged in the drying furnace and distributed at intervals, an upper collecting box connected with the upper part of the membrane walls is arranged at the top of the membrane walls, a lower collecting box connected with the lower part of the membrane walls is arranged at the bottom of the membrane walls, one of the upper collecting box and the lower collecting box is used as an access collecting box for saturated steam, and the other collecting box of the upper collecting box and the lower collecting box is used as a steam-water mixture output collecting box. The invention realizes the large-scale continuous drying operation of the lignite and improves the safety of the lignite drying operation.

Description

Double-heat-source built-in hot low-rank lump coal drying furnace
Technical Field
The invention relates to the technical field of coal, in particular to a double-heat-source built-in low-rank lump coal drying furnace.
Background
The lignite is low-rank coal with low coalification degree and has the characteristics of large moisture, high volatile components, low heat value, easiness in oxidation and spontaneous combustion and the like. The lignite is widely used for various reasons, wherein the large water content (30% -50%) is an important reason, the utilization value of the lignite is improved, and no matter how the lignite is used (burning or vaporization and the like) subsequently, the drying and moisture removal of the lignite are necessary processes, so that the development of safe and controllable lignite drying equipment and process capable of continuously drying on a large scale is a necessary way for developing efficient and clean utilization of the lignite.
Disclosure of Invention
In order to solve the problems, the invention provides a double-heat-source built-in low-rank lump coal drying furnace, which aims to realize large-scale continuous drying operation of lignite and improve the safety of lignite drying operation. The specific technical scheme is as follows:
a double-heat-source built-in low-rank lump coal drying furnace comprises a membrane wall heating module which is arranged in the drying furnace and takes saturated steam as a heat source, a high-temperature flue gas supply pipeline which is connected to the lower part of the drying furnace and is used for conveying high-temperature flue gas into the drying furnace, and a low-temperature flue gas discharge pipeline which is arranged at the upper part of the drying furnace and is used for discharging the flue gas of the drying furnace; the upper part of the drying furnace is a coal pre-storage area, the middle part of the drying furnace is a coal drying area, the lower part of the drying furnace is a coal discharging area, an annular air passage is arranged at the periphery of the pre-storage area at the upper part of the drying furnace, and a low-temperature flue gas output port connected with the low-temperature flue gas discharging pipeline is arranged on the annular air passage; the membrane wall heating module comprises a plurality of membrane walls which are vertically arranged in the drying furnace and distributed at intervals, an upper collecting box connected with the upper part of the membrane walls is arranged at the top of the membrane walls, a lower collecting box connected with the lower part of the membrane walls is arranged at the bottom of the membrane walls, one of the upper collecting box and the lower collecting box is used as an access collecting box for saturated steam, and the other collecting box of the upper collecting box and the lower collecting box is used as a steam-water mixture output collecting box.
As one preferable scheme of the membrane wall arrangement structure in the invention, the membrane walls are distributed in parallel at intervals in the drying furnace, and a passage for coal passing and flue gas heating is formed between two adjacent membrane walls.
As a second preferable mode of the membrane wall arrangement structure in the invention, the membrane walls are distributed at intervals in a central radiation divergence shape in the drying furnace, and a passage for coal passing and flue gas heating is formed between the two adjacent membrane walls and the furnace wall of the drying furnace.
As a further improvement, the membrane wall comprises a plurality of steam pipes which are arranged at intervals and are vertically arranged and flat steel connected between every two adjacent steam pipes, and the flat steel of the membrane wall is provided with a through smoke convection hole or a smoke convection groove.
In the invention, the collection box comprises a plurality of strip-shaped box bodies, the strip-shaped box bodies are consistent with the central plane of the membrane wall, and a communicating box body is arranged between every two adjacent strip-shaped box bodies.
In the invention, the discharge area is provided with a high-temperature flue gas inlet, and the high-temperature flue gas supply pipeline is connected with the high-temperature flue gas inlet of the discharge area and is used for guiding high-temperature flue gas into the drying furnace.
In the invention, a discharging device is arranged at the bottom of the drying furnace, and comprises a flat gate and a rotary grid type sealing valve; the rotary format sealing valve comprises a shell and a rotary format valve core, and the rotary format valve core is driven to rotate through a variable frequency motor so as to realize the adjustment of the discharge amount.
The shell lining and the valve core of the rotary grid type sealing valve are made of corrosion-resistant and wear-resistant steel, so that the long-term stable operation of equipment is ensured. The rotary grid type sealing valve can realize quantitative and uniform discharge, the rotating speed of the valve core can be adjusted after the frequency conversion device is arranged, the effect of adjusting the discharge amount of the system is achieved, and the stability of a material layer in the furnace is ensured. In addition, the rotary grid type sealing valve can prevent the gas of upstream and downstream equipment from communicating, and the gas locking device on the grid valve can prevent the smoke and dust in the furnace from overflowing, prevent air outside the furnace from mixing, control the stability of the oxygen content in the furnace and ensure the safety of the system operation.
In the invention, the low-temperature flue gas discharge pipeline is connected with a flue gas inlet of the bag-type dust remover, and a flue gas outlet of the bag-type dust remover is connected with a chimney through a pipeline.
Preferably, the low-rank coal is lignite with a water content of 30% -50% at 25 ℃, the saturated steam is saturated steam of 1.0Mpa, the high-temperature flue gas in the high-temperature flue gas supply pipeline is high-temperature flue gas at 130 ℃, the low-temperature flue gas in the low-temperature flue gas discharge pipeline is low-temperature flue gas at 85 ℃, and the lignite becomes lignite with a water content of 28% at 65 ℃ after being dried by the drying furnace.
The typical process flow of the low-rank coal drying system adopted by the invention is as follows:
(1) and (3) drying system flow:
the normal temperature lignite containing 40% of water is conveyed to the top of the drying furnace through a conveying system, and the lignite is uniformly loaded into the drying furnace through a loading device of a distributing device. The lignite is subjected to heat exchange with the flue gas at the temperature of about 130 ℃ and the membrane wall heating module in the drying furnace, the lignite is heated to 65 ℃, the moisture content is reduced to about 28%, the evaporated moisture is carried out of the drying furnace by the flue gas, and the dried lignite is continuously and uniformly discharged onto a conveyor through a discharging device and is sent to a subsequent treatment system.
And (3) exhausting flue gas at the temperature of about 85 ℃ from a low-temperature flue gas outlet of the drying furnace, and exhausting the flue gas from a chimney after dust removal by a bag-type dust remover.
In the drying process, the flue gas with low oxygen content is used as a part of heat source and moisture-carrying medium for drying the lignite, so that the running safety of equipment in the drying process is ensured.
(2) And (3) heating system flow:
the heating system adopts a hot flue gas and saturated steam double heat source for heat transfer.
Hot flue gas at the temperature of about 130 ℃ enters the furnace from the lower part of the drying furnace, and is used as a part of drying heat source and a moisture-carrying medium to directly contact with lignite in the furnace for heat transfer. Meanwhile, the membrane wall heating module in the drying zone of the heating furnace adopts saturated steam as a heat source to indirectly transfer heat with the lignite, so that the lignite drying efficiency is further improved.
The lignite is heated from 25 ℃ to about 85 ℃ in the drying furnace, 12% of moisture in the lignite is evaporated, and the 12% of moisture is carried out of the drying furnace through flue gas.
The invention has the beneficial effects that:
firstly, the double-heat-source built-in low-rank lump coal drying furnace adopts a fluidized bed drying technology of a smoke and steam double heat source and a built-in membrane type wall heating module, smoke is introduced into the furnace to directly transfer heat with lignite, saturated steam is adopted by the membrane type wall heating module as a heat source to indirectly transfer heat with lignite, the low-rank coal drying system with double heat sources can greatly improve the drying efficiency of lignite, so that large-scale continuous drying operation of lignite is realized, and smoke with low oxygen content is adopted as a partial heat source and a moisture-carrying medium for drying lignite, so that the safety of equipment operation in the drying process is ensured.
Secondly, according to the double-heat-source built-in low-rank lump coal drying furnace, the membrane wall is provided with the convection holes or the convection grooves for accelerating heat transfer, so that the heat transfer in the furnace body is more uniform, and the drying effect is further improved.
Thirdly, the discharging device of the double-heat-source built-in low-rank lump coal drying furnace adopts a rotary grid type sealing valve, and the valve core is driven to rotate by the variable frequency motor, so that the discharge amount can be adjusted, and the stability of a material layer in the furnace is ensured. In addition, the rotary grid sealing valve can block the gas communication of upstream and downstream equipment, the gas locking device on the grid sealing valve can prevent the overflow of smoke and dust in the furnace, and can also prevent the air outside the furnace from mixing, control the stability of the oxygen content in the furnace and ensure the safety of the system operation.
Fourthly, according to the double-heat-source built-in low-rank lump coal drying furnace, a certain amount of lignite can be pre-stored in the coal pre-storage area, and the continuous operation of the whole drying system is guaranteed. The periphery of the prestoring area is provided with an annular air passage, and the dried flue gas carries lignite moisture out of the drying furnace through the annular air passage, so that the prestoring area also plays a role in sealing the drying furnace and preventing flue gas from leaking.
Drawings
FIG. 1 is a schematic structural diagram of a dual-heat-source built-in low-rank lump coal drying furnace of the invention;
FIG. 2 is a schematic structural view (top view) of the membrane wall heating module referenced in FIG. 1;
FIG. 3 is a schematic structural view of the membrane wall of FIG. 2;
FIG. 4 is a schematic structural diagram of a double-heat-source built-in heat low-rank lump coal drying furnace, a bag-type dust collector and a chimney.
In the figure: 1. the device comprises a drying furnace, 2, a bag-type dust collector, 3, a chimney, 4, a membrane wall heating module, 5, a high-temperature flue gas supply pipeline, 6, a low-temperature flue gas discharge pipeline, 7, a coal pre-storage area, 8, a coal drying area, 9, a coal discharge area, 10, an annular air passage, 11, a low-temperature flue gas output port, 12, a high-temperature flue gas input port, 13, a membrane wall, 14, a collection box (upper collection box), 15, a passage for coal to pass through and flue gas to heat, 16, a steam pipe, 17, flat steel, 18, a flue gas convection hole or a flue gas convection groove, 19, a strip-shaped box body, 20, a communication box body, 21, a discharge device, 22 and a flue gas.
Detailed Description
The following description of the embodiments of the present invention will be made with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
As shown in fig. 1 to 4, an embodiment of a dual-heat-source built-in low-rank lump coal drying oven according to the present invention includes a membrane wall heating module 4 using saturated steam as a heat source and disposed inside a drying oven 1, a high-temperature flue gas supply pipeline 5 connected to a lower portion of the drying oven 1 for conveying high-temperature flue gas into the drying oven 1, and a low-temperature flue gas discharge pipeline 6 disposed at an upper portion of the drying oven 1 for discharging flue gas of the drying oven 1; the upper part of the drying furnace 1 is a coal pre-storage area 7, the middle part of the drying furnace 1 is a coal drying area 8, the lower part of the drying furnace 1 is a coal discharging area 9, an annular air flue 10 is arranged at the periphery of the pre-storage area 7 at the upper part of the drying furnace 1, and a low-temperature flue gas output port 11 connected with the low-temperature flue gas discharge pipeline 6 is arranged on the annular air flue 10; the membrane wall heating module 4 comprises a plurality of membrane walls 13 which are vertically arranged in the drying furnace 1 and are distributed at intervals, an upper header 14 connected with the upper part of the membrane walls 13 is arranged at the top of the membrane walls 13, a lower header connected with the lower part of the membrane walls 13 is arranged at the bottom of the membrane walls 13, one of the upper header 14 and the lower header serves as an access header for saturated steam, and the other one of the upper header 24 and the lower header serves as a steam-water mixture output header.
As one of the preferable schemes of the membrane wall arrangement structure in this embodiment, the membrane walls 13 are distributed in parallel at intervals inside the drying furnace 1, and a passage for coal passing and flue gas heating is formed between two adjacent membrane walls 13.
As a second preferable scheme of the membrane wall arrangement structure in this embodiment, the membrane walls 13 are distributed at intervals in a central radiation manner inside the drying furnace 1, and a passage for coal passing and flue gas heating is formed between two adjacent membrane walls 13 and the furnace wall of the drying furnace 1.
As a further improvement, the membrane wall 13 comprises a plurality of steam pipes 16 which are arranged at intervals and are vertically arranged, and a flat steel 17 connected between two adjacent steam pipes 16, and the flat steel 17 of the membrane wall 13 is provided with a through flue gas convection hole or a through flue gas convection groove 18.
In this embodiment, the header 14 includes a plurality of elongated boxes 19, the elongated boxes 19 are aligned with the central plane of the membrane wall 13, and a communication box 20 is further disposed between two adjacent elongated boxes 19.
In this embodiment, the discharging area 9 is provided with a high-temperature flue gas inlet 12, and the high-temperature flue gas supply pipeline 5 is connected to the high-temperature flue gas inlet 12 of the discharging area 9 to introduce high-temperature flue gas into the drying furnace 1.
As an alternative, a high-temperature flue gas branch pipe is further arranged on the high-temperature flue gas supply pipeline 5, and the high-temperature flue gas of the high-temperature flue gas branch pipe is mixed with the low-temperature flue gas of the low-temperature flue gas discharge pipeline 6 through a mixer and then is connected into the bag-type dust collector 2 for dust removal so as to ensure that the temperature of the mixed flue gas exceeds the dew point temperature of the flue gas.
Under the condition that the dew point temperature of the flue gas is higher, a certain amount of high-temperature flue gas is mixed into the low-temperature flue gas from the drying furnace 1 through the high-temperature flue gas branch pipeline and the flue gas mixer, so that the mixed flue gas temperature exceeds the dew point temperature of the flue gas, and the stable and reliable operation of the bag-type dust collector 2 is facilitated.
In this embodiment, a discharging device 21 is installed at the bottom of the drying furnace 1, and the discharging device 21 includes a flat gate and a rotary format sealing valve; the rotary format sealing valve comprises a shell and a rotary format valve core, and the rotary format valve core is driven to rotate through a variable frequency motor so as to realize the adjustment of the discharge amount.
The shell lining and the valve core of the rotary grid type sealing valve are made of corrosion-resistant and wear-resistant steel, so that the long-term stable operation of equipment is ensured. The rotary grid type sealing valve can realize quantitative and uniform discharge, the rotating speed of the valve core can be adjusted after the frequency conversion device is arranged, the effect of adjusting the discharge amount of the system is achieved, and the stability of a material layer in the furnace is ensured. In addition, the rotary grid type sealing valve can prevent the gas of upstream and downstream equipment from communicating, and the gas locking device on the grid valve can prevent the smoke and dust in the furnace from overflowing, prevent air outside the furnace from mixing, control the stability of the oxygen content in the furnace and ensure the safety of the system operation.
In this embodiment, the low-temperature flue gas discharge pipeline 6 is connected to the flue gas inlet of the bag-type dust collector 2, and the flue gas outlet of the bag-type dust collector 2 is connected to the chimney 3 through a pipeline.
Preferably, the low-rank coal is lignite with a water content of 30% -50% at 25 ℃, the saturated steam is saturated steam of 1.0Mpa, the high-temperature flue gas in the high-temperature flue gas supply pipeline 5 is high-temperature flue gas at 130 ℃, the low-temperature flue gas in the low-temperature flue gas discharge pipeline 6 is low-temperature flue gas at 85 ℃, and the lignite becomes lignite with a water content of 28% at 65 ℃ after being dried by the drying furnace.
The typical process flow using the low-rank coal drying system of this example is as follows:
(1) and (3) drying system flow:
the normal temperature lignite containing 40% of water is conveyed to the top of the drying furnace 1 through a conveying system, and the lignite is uniformly loaded into the drying furnace 1 through a loading device of a distributing device. The lignite is subjected to heat exchange with the flue gas at the temperature of about 130 ℃ and the membrane wall heating module 4 in the drying furnace 1, the lignite is heated to 65 ℃, the moisture content is reduced to about 28%, the evaporated moisture is carried out of the drying furnace by the flue gas, and the dried lignite is continuously and uniformly discharged onto a conveyor through a discharging device and is sent to a subsequent treatment system.
The flue gas with the temperature of about 85 ℃ discharged from the low-temperature flue gas outlet 11 of the drying furnace 1 is dedusted by the bag-type dust collector 2 and then is exhausted from the chimney 3.
In the drying process, the flue gas with low oxygen content is used as a part of heat source and moisture-carrying medium for drying the lignite, so that the running safety of equipment in the drying process is ensured.
(2) And (3) heating system flow:
the heating system adopts a hot flue gas and saturated steam double heat source for heat transfer.
Hot flue gas at the temperature of about 130 ℃ enters the drying furnace 1 from the lower part of the drying furnace, and is used as a part of drying heat source and a moisture-carrying medium to directly contact with lignite in the furnace for heat transfer. Meanwhile, the membrane wall heating module 4 of the heating furnace drying area 8 adopts saturated steam as a heat source to indirectly transfer heat with the lignite, so that the lignite drying efficiency is further improved.
The lignite is heated from 25 ℃ to about 85 ℃ in the drying furnace 1, 12% of moisture in the lignite is evaporated, and the 12% of moisture is carried out of the drying furnace through flue gas.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the technical principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims (9)

1. The double-heat-source built-in low-rank lump coal drying furnace is characterized by comprising a membrane wall heating module which is arranged in the drying furnace and takes saturated steam as a heat source, a high-temperature flue gas supply pipeline which is connected to the lower part of the drying furnace and is used for conveying high-temperature flue gas into the drying furnace, and a low-temperature flue gas discharge pipeline which is arranged at the upper part of the drying furnace and is used for discharging the flue gas of the drying furnace; the upper part of the drying furnace is a coal pre-storage area, the middle part of the drying furnace is a coal drying area, the lower part of the drying furnace is a coal discharging area, an annular air passage is arranged at the periphery of the pre-storage area at the upper part of the drying furnace, and a low-temperature flue gas output port connected with the low-temperature flue gas discharging pipeline is arranged on the annular air passage; the membrane wall heating module comprises a plurality of membrane walls which are vertically arranged in the drying furnace and distributed at intervals, an upper collecting box connected with the upper part of the membrane walls is arranged at the top of the membrane walls, a lower collecting box connected with the lower part of the membrane walls is arranged at the bottom of the membrane walls, one of the upper collecting box and the lower collecting box is used as an access collecting box for saturated steam, and the other collecting box of the upper collecting box and the lower collecting box is used as a steam-water mixture output collecting box.
2. The double-heat-source built-in low-rank lump coal drying furnace as claimed in claim 1, wherein the membrane walls are arranged in parallel at intervals in the drying furnace, and a passage for coal passing and flue gas heating is formed between two adjacent membrane walls.
3. The double-heat-source built-in low-rank lump coal drying furnace as claimed in claim 1, wherein the membrane walls are distributed at intervals in a central radiation manner in the drying furnace, and a passage for coal passing and flue gas heating is formed between each two adjacent membrane walls and the furnace wall of the drying furnace.
4. The double-heat-source built-in low-rank lump coal drying furnace as claimed in claim 1, wherein the membrane wall comprises a plurality of steam pipes arranged at intervals and arranged vertically and flat steel connected between two adjacent steam pipes, and the flat steel of the membrane wall is provided with through flue gas convection holes or flue gas convection grooves.
5. The dual-heat-source built-in low-rank lump coal drying furnace as claimed in claim 1, wherein the collection box comprises a plurality of elongated boxes, the elongated boxes are aligned with the central plane of the membrane wall, and a communication box is further disposed between two adjacent elongated boxes.
6. The double-heat-source built-in low-rank lump coal drying furnace as claimed in claim 1, wherein the discharging area is provided with a high-temperature flue gas inlet, and the high-temperature flue gas supply pipeline is connected with the high-temperature flue gas inlet of the discharging area for introducing high-temperature flue gas into the drying furnace.
7. The dual-heat-source built-in low-rank lump coal drying furnace as claimed in claim 1, wherein a discharging device is installed at the bottom of the drying furnace, and the discharging device comprises a flat gate and a rotary lattice sealing valve; the rotary format sealing valve comprises a shell and a rotary format valve core, and the rotary format valve core is driven to rotate through a variable frequency motor so as to realize the adjustment of the discharge amount.
8. The dual-heat-source built-in low-rank lump coal drying furnace according to claim 1, wherein the low-temperature flue gas discharge pipeline is connected with a flue gas inlet of a bag-type dust remover, and a flue gas outlet of the bag-type dust remover is connected with a chimney through a pipeline.
9. The double-heat-source built-in low-rank lump coal drying furnace according to claim 1, wherein the low-rank coal is lignite with a water content of 30% to 50% at 25 ℃, the saturated steam is saturated steam of 1.0Mpa, the high-temperature flue gas in the high-temperature flue gas supply pipeline is high-temperature flue gas at 130 ℃, the low-temperature flue gas in the low-temperature flue gas discharge pipeline is low-temperature flue gas at 85 ℃, and the lignite is dried by the drying furnace to become lignite with a water content of 28% at 65 ℃.
CN202010625864.8A 2020-07-02 2020-07-02 Double-heat-source built-in hot low-rank lump coal drying furnace Pending CN111895727A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113280616A (en) * 2021-06-08 2021-08-20 中冶焦耐(大连)工程技术有限公司 Low-rank pulverized coal drying process and system

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CN204404213U (en) * 2015-01-22 2015-06-17 华北电力大学 A kind of power station brown coal fluidized bed drying system saving desulfurizing tower water consumption
CN106766946A (en) * 2016-08-30 2017-05-31 彭武星 The dry coke quenching or sintering deposit cooling stove of even distributing wind uniform discharge lock wind

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