CN113280616A - Low-rank pulverized coal drying process and system - Google Patents
Low-rank pulverized coal drying process and system Download PDFInfo
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- CN113280616A CN113280616A CN202110638700.3A CN202110638700A CN113280616A CN 113280616 A CN113280616 A CN 113280616A CN 202110638700 A CN202110638700 A CN 202110638700A CN 113280616 A CN113280616 A CN 113280616A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B17/00—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement
- F26B17/12—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed solely by gravity, i.e. the material moving through a substantially vertical drying enclosure, e.g. shaft
- F26B17/122—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed solely by gravity, i.e. the material moving through a substantially vertical drying enclosure, e.g. shaft the material moving through a cross-flow of drying gas; the drying enclosure, e.g. shaft, consisting of substantially vertical, perforated walls
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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
- F26B21/14—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects using gases or vapours other than air or steam, e.g. inert gases
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
- F26B25/005—Treatment of dryer exhaust gases
- F26B25/007—Dust filtering; Exhaust dust filters
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- General Engineering & Computer Science (AREA)
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Abstract
The invention relates to a low-order pulverized coal drying process and a system thereof.A hot flue gas discharged by an external heating type vertical furnace heating system or other low-oxygen drying hot flue gases are used as heat sources and are distributed in a coal material in a low-order pulverized coal drying device through a gas distribution device, and the coal as fired is dried in a gas-solid direct contact mode; the hot flue gas and the coal material flow in the same direction to complete the heat exchange process, and the low-temperature flue gas after heat exchange is collected by the gas collecting device and then discharged out of the low-order pulverized coal drying device; and (3) directly feeding the dried coal material into an external heating type vertical furnace for dry distillation. The drying efficiency is high, the moisture of the dried coal material is uniform and stable, the occupied area of equipment is small, and the operation cost is low.
Description
Technical Field
The invention relates to the technical field of coal chemical industry, in particular to a low-order pulverized coal drying process and system.
Background
The water content of the low-rank pulverized coal is up to 25% -60%, and the water in the coal not only has great influence on the pyrolysis of the low-rank pulverized coal, but also increases the transportation cost, the storage cost and the processing cost, and even influences the normal operation of production equipment. At present, the drying mode of low-order fine coal mainly comprises: indirect drying processes (such as drum drying technology, membrane wall drying technology, and the like), direct drying processes (such as fluidized bed drying technology, vibration drying technology, and the like); the indirect drying process has low working efficiency, large occupied area and high equipment operation cost, and the direct drying process has high working efficiency, but the low-temperature tail gas has high dust content and is difficult to treat.
In recent years, a technique has been developed for drying low-rank fine coal containing water by directly introducing high-temperature gas into the low-rank fine coal bed. In the drying process, the gas and the low-order pulverized coal flow in the drying equipment in a reverse direction for heat exchange, and the gas-solid heat exchange efficiency is high. But it has problems that: the temperature of the pulverized coal is continuously increased in the downward movement process, the drying gas passes through the low-order pulverized coal layer from bottom to top and heats and dries the low-order pulverized coal layer, and the temperature is gradually reduced; in the process, water in the coal seam is converted into water vapor which is collected to the upper gas outlet along with the drying gas, and because the temperature of the coal seam at the gas outlet is low, part of the water vapor is condensed again, the low-rank coal seam in the area is hardened, the discharging is not smooth, and the drying function of the coal material is weakened; meanwhile, the subsequent gas dust removal is easy to generate the condensation phenomenon and is very difficult to process; in addition, a coal pyrolysis phenomenon may occur due to an excessively high outlet temperature of the low-rank pulverized coal.
Disclosure of Invention
The invention provides a low-order pulverized coal drying process and a system, wherein hot waste gas discharged by an external heating type vertical furnace heating system or other low-oxygen drying hot flue gas is used as a heat source, and a gas and solid concurrent flow heat exchange mode is adopted to continuously and stably heat and dehydrate low-order pulverized coal; the drying efficiency is high, the moisture of the dried coal material is uniform and stable, the occupied area of equipment is small, and the operation cost is low.
In order to achieve the purpose, the invention adopts the following technical scheme:
a low-order pulverized coal drying process is characterized in that a low-order pulverized coal drying device is arranged at the top of an external heating type vertical furnace for low-order pulverized coal dry distillation, and an air distribution device and an air collection device are arranged in the low-order pulverized coal drying device; hot flue gas discharged by an external heating type vertical furnace heating system or other low-oxygen drying hot flue gas is used as a heat source and is distributed in coal materials in a low-order pulverized coal drying device through a gas distribution device, and the coal as fired is dried in a gas-solid direct contact mode; the hot flue gas and the coal material flow in the same direction to complete the heat exchange process, and the low-temperature flue gas after heat exchange is collected by the gas collecting device and then discharged out of the low-order pulverized coal drying device; and (3) directly feeding the dried coal material into an external heating type vertical furnace for dry distillation.
The particle size d of the low-order pulverized coal is more than 0 and less than or equal to 30 mm.
The temperature of the hot flue gas is 150-350 ℃.
The air distribution device is provided with a plurality of air supply ports, the operating pressure at the air supply ports is positive pressure, and the air supply pressure is greater than 0 and less than or equal to 100 Pa.
The gas collecting device is provided with a plurality of exhaust ports, the operating pressure at the exhaust ports is negative pressure, and the exhaust pressure is less than or equal to-100 Pa and less than 0.
The gas distribution device is arranged above the gas collection device, when the low-order pulverized coal drying device is started, the gas distribution device and the gas collection device are both immersed in the coal bed, and the distance from the top surface of the coal bed to the top surface of the gas distribution device on the uppermost layer is more than or equal to 0.2 m.
A low-order pulverized coal drying system comprises a low-order pulverized coal drying device, an air supply pipeline, an exhaust pipeline, an air supply fan, a dust removal device and a chimney; the low-order pulverized coal drying device consists of a body, a coal charging device, a gas distribution device, a gas collection device and a feeding device; the coal charging device is arranged at a feed port at the top of the body, and a discharge port at the bottom of the body is connected with a feed port at the top of the external heating type vertical furnace through the feeding device; the upper part in the body is provided with an air distribution device, and the lower part is provided with an air collection device; the gas distribution device is provided with a plurality of gas supply ports, and the gas collection device is provided with a plurality of gas exhaust ports; a gas inlet of the gas distribution device is connected with a hot waste gas outlet of the heating system of the external heating type vertical furnace through a gas supply pipeline, and a gas supply fan is arranged on the gas supply pipeline; the gas outlet of the gas collection device is connected with the chimney through an exhaust pipeline, and a dust removal device and a dust removal fan are sequentially arranged on the exhaust pipeline along the gas flowing direction.
The gas distribution device and/or the gas collection device are/is provided with a plurality of layers along the height direction.
Along the gas flow direction, establish air feed pressure regulating valve on the air supply pipeline of air feed fan low reaches, establish the exhaust pressure regulating valve on the exhaust pipeline of dust collector upper reaches.
Compared with the prior art, the invention has the beneficial effects that:
1) the invention preferentially adopts the hot flue gas discharged by the vertical furnace heating system to fully recover and utilize the waste heat of the flue gas, and simultaneously can also adopt other low-oxygen dry hot flue gas as a dry gas source.
2) The invention can continuously and stably heat and dehydrate the low-order pulverized coal, and the particle size distribution range of the treated pulverized coal is wider.
3) In the low-order pulverized coal drying device, the drying hot flue gas and the wet pulverized coal flow in the same direction for heat exchange, the drying hot flue gas firstly contacts with low-temperature wet pulverized coal particles to be rapidly cooled, so that the pyrolysis phenomenon of low-order pulverized coal in the drying process due to overhigh temperature is avoided, and finally the discharge temperature of the pulverized coal and the outlet temperature of gas can be stably regulated and controlled above the dew point temperature of the flue gas; simulation calculation shows that the water and temperature distribution of the coal bed are uniform, so that the energy is saved, the dust content of tail gas is low, and a series of problems of equipment corrosion, unstable system operation and the like caused by a dewing phenomenon during subsequent dust removal treatment of low-temperature gas are avoided;
4) the low order fine coal drying device sets up at the outer hot type vertical furnace top that is used for low order fine coal dry distillation, and the dry back low order fine coal need not to be transported, stored, directly goes into stove dry distillation and handles, does not have extra calorific loss, has increased substantially the ability that outer hot type vertical furnace handled the low order fine coal.
5) The downward movement process speed of the pulverized coal particle layer is low, so that the equipment has low wear rate and is easy to maintain.
6) The system has simple structure, small occupied area, convenient operation and low running cost;
drawings
FIG. 1 is a schematic diagram of a low-rank pulverized coal drying system according to the present invention.
In the figure: 1. external heating type vertical furnace 2, low-order pulverized coal drying device 3, gas distribution device 4, gas collection device 5, coal charging device 6, feeding device 7, gas supply pipeline 8, gas supply fan 9, gas exhaust pipeline 10, dust removal device 11, dust removal fan 12, chimney 13, gas supply pressure regulating valve 14 and exhaust pressure regulating valve
Detailed Description
The following further describes embodiments of the present invention with reference to the accompanying drawings:
as shown in figure 1, in the low-rank pulverized coal drying process, a low-rank pulverized coal drying device 2 is arranged at the top of an external heating type vertical furnace 1 for low-rank pulverized coal dry distillation, and an air distribution device 3 and an air collection device 4 are arranged in the low-rank pulverized coal drying device 2; hot flue gas discharged by a heating system of the external heating type vertical furnace 1 or other low-oxygen drying hot flue gas is used as a heat source and is distributed in coal materials in the low-order pulverized coal drying device 2 through the gas distribution device 3, and the coal as fired is dried in a gas-solid direct contact mode; the hot flue gas and the coal material flow in the same direction to complete the heat exchange process, and the low-temperature flue gas after heat exchange is collected by the gas collecting device 4 and then discharged out of the low-order pulverized coal drying device 2; the dried coal material directly enters an external heating vertical furnace 1 for dry distillation.
The particle size d of the low-order pulverized coal is more than 0 and less than or equal to 30 mm.
The temperature of the hot flue gas is 150-350 ℃.
The air distribution device 3 is provided with a plurality of air supply ports, the operating pressure at the air supply ports is positive pressure, and the air supply pressure is greater than 0 and less than or equal to 100 Pa.
The gas collecting device 4 is provided with a plurality of exhaust ports, the operating pressure at the exhaust ports is negative pressure, and the exhaust pressure is more than or equal to-100 Pa and less than 0.
The gas distribution device 3 is arranged above the gas collection device 4, when the low-order pulverized coal drying device 2 is started, the gas distribution device 3 and the gas collection device 4 are both immersed in a coal seam, and the distance between the top surface of the coal seam and the top surface of the gas distribution device on the uppermost layer is larger than or equal to 0.2 m.
A low-order pulverized coal drying system comprises a low-order pulverized coal drying device 2, an air supply pipeline 7, an air exhaust pipeline 9, an air supply fan 8, a dust removal fan 11, a dust removal device 10 and a chimney 12; the low-order pulverized coal drying device 2 consists of a body, a coal charging device 5, a gas distribution device 3, a gas collection device 4 and a feeding device 6; the body is arranged at the top of the external heating type vertical furnace 1, a coal charging device 5 is arranged at a feed port at the top of the body, and a discharge port at the bottom of the body is connected with the feed port at the top of the external heating type vertical furnace 1 through a feeding device 6; in the body, the upper part is provided with a gas distribution device 3, and the lower part is provided with a gas collection device 4; the gas distribution device 3 is provided with a plurality of gas supply ports, and the gas collection device 4 is provided with a plurality of gas exhaust ports; a gas inlet of the gas distribution device 3 is connected with a hot waste gas outlet of a heating system of the external heating type vertical furnace 1 through a gas supply pipeline 7, and a gas supply fan 8 is arranged on the gas supply pipeline 7; the gas outlet of the gas collecting device 4 is connected with a chimney 12 through an exhaust pipeline 9, and a dust removing device 10 and a dust removing fan 11 are sequentially arranged on the exhaust pipeline 9 along the gas flowing direction.
The gas distribution device 3 and/or the gas collection device 4 are arranged in multiple layers along the height direction.
In the gas flowing direction, a gas supply pressure regulating valve 13 is arranged on the gas supply pipeline 7 at the downstream of the gas supply fan 8, and a gas exhaust pressure regulating valve 14 is arranged on the gas exhaust pipeline 9 at the upstream of the dust removing device 10.
As shown in FIG. 1, the specific process of the low-rank pulverized coal drying process of the invention is as follows:
hot flue gas (about 150-350 ℃) discharged by a heating system of the external heating type vertical furnace 1 is extracted from a hot waste gas outlet under the action of an air supply fan 8, is pressure-regulated by an air supply pressure regulating valve 13, is sent into a low-order pulverized coal drying device 2 through an air distribution device 3, and is subjected to direct contact heat exchange with low-order pulverized coal (within 30mm of particle size). The coal material entering the low-order pulverized coal drying device 2 through the coal material charging device 5 slowly moves downward under the action of the self gravity. Under the influence of the pressure gradient change of the inlet and the outlet of the low-order pulverized coal drying device 2 and the airflow resistance generated by the material seal thickness of the upper part of the gas distribution device 3 and the lower part of the gas collection device 4, hot flue gas is discharged by the gas distribution device 3 and then moves towards the lower part of the gas collection device 4. In the process, the hot flue gas firstly contacts the low-temperature coal material, heat is quickly transferred to the pulverized coal particles, the temperature of the hot flue gas is quickly reduced, and the phenomenon that the low-order pulverized coal is pyrolyzed due to overhigh temperature in the drying process is avoided. The temperature of the pulverized coal particles is gradually heated to be higher than 100 ℃, and water in the pulverized coal particles is gradually gasified into water vapor which is then collected with the flue gas and discharged through an exhaust port of the gas collecting device 4. In the gas-solid heat exchange process, gas and solid move downwards in the same direction, the temperature of the gas and the solid is close to that of the gas and the solid when the gas and the solid are separated (higher than the dew point by 5-80 ℃), and meanwhile, the moisture in the coal layer is relatively uniform, so that the hardening phenomenon of the coal material due to excessive temperature rise is avoided.
The control of the inter-bed gas pressure inside the low-rank pulverized coal drying device 2 is performed by a supply pressure regulating valve 13 and an exhaust pressure regulating valve 14. The low-temperature flue gas discharged by the gas collecting device 4 enters the dust removing device 10 for dust removing and purifying treatment under the negative pressure action of the dust removing fan 11, and the clean flue gas meeting the emission standard is sent to the chimney 12 for emission.
According to the low-rank pulverized coal drying process, other low-oxygen drying hot flue gas can be used as a heat source of a low-rank pulverized coal drying device. At this time, the gas supply pipeline 7 is not connected with a hot waste gas outlet of the heating system of the external heating type vertical furnace 1, but is connected with an external hot flue gas pipeline.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (9)
1. A low-order pulverized coal drying process is characterized in that a low-order pulverized coal drying device is arranged at the top of an external heating type vertical furnace for low-order pulverized coal dry distillation, and an air distribution device and an air collection device are arranged in the low-order pulverized coal drying device; hot flue gas discharged by an external heating type vertical furnace heating system or other low-oxygen drying hot flue gas is used as a heat source and is distributed in coal materials in a low-order pulverized coal drying device through a gas distribution device, and the coal as fired is dried in a gas-solid direct contact mode; the hot flue gas and the coal material flow in the same direction to complete the heat exchange process, and the low-temperature flue gas after heat exchange is collected by the gas collecting device and then discharged out of the low-order pulverized coal drying device; and (3) directly feeding the dried coal material into an external heating type vertical furnace for dry distillation.
2. The process for drying low-rank pulverized coal as claimed in claim 1, wherein the particle size of the low-rank pulverized coal is 0 < d ≦ 30 mm.
3. The low-rank pulverized coal drying process according to claim 1, wherein the temperature of the hot flue gas is 150 ℃ to 350 ℃.
4. The low-rank pulverized coal drying process according to claim 1, wherein the air distribution device is provided with a plurality of air supply ports, the operating pressure at the air supply ports is positive pressure, and the air supply pressure is greater than 0 and less than or equal to 100 Pa.
5. The low-rank pulverized coal drying process according to claim 1, wherein the gas collecting device is provided with a plurality of exhaust ports, the operating pressure at the exhaust ports is negative pressure, and the exhaust pressure is-100 Pa or more and less than 0.
6. The low-rank pulverized coal drying process according to claim 1, wherein the gas distribution device is arranged above the gas collection device, when the low-rank pulverized coal drying device is started, the gas distribution device and the gas collection device are immersed in the coal seam, and the top surface of the coal seam is higher than the top surface of the uppermost gas distribution device by a distance of more than or equal to 0.2 m.
7. The low-rank pulverized coal drying system for realizing the process as claimed in any one of claims 1 to 6, which is characterized by comprising a low-rank pulverized coal drying device, an air supply pipeline, an air exhaust pipeline, an air supply fan, a dust removal device and a chimney; the low-order pulverized coal drying device consists of a body, a coal charging device, a gas distribution device, a gas collection device and a feeding device; the coal charging device is arranged at a feed port at the top of the body, and a discharge port at the bottom of the body is connected with a feed port at the top of the external heating type vertical furnace through the feeding device; the upper part in the body is provided with an air distribution device, and the lower part is provided with an air collection device; the gas distribution device is provided with a plurality of gas supply ports, and the gas collection device is provided with a plurality of gas exhaust ports; a gas inlet of the gas distribution device is connected with a hot waste gas outlet of the heating system of the external heating type vertical furnace through a gas supply pipeline, and a gas supply fan is arranged on the gas supply pipeline; the gas outlet of the gas collection device is connected with the chimney through an exhaust pipeline, and a dust removal device and a dust removal fan are sequentially arranged on the exhaust pipeline along the gas flowing direction.
8. The low-rank pulverized coal drying system according to claim 7, wherein the gas distribution device and/or the gas collection device are arranged in multiple layers in a height direction.
9. The low-rank pulverized coal drying system as claimed in claim 7, wherein a supply air pressure regulating valve is provided on the supply air pipe downstream of the supply air blower, and an exhaust air pressure regulating valve is provided on the exhaust air pipe upstream of the dust removing device, in the air flow direction.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110638700.3A CN113280616A (en) | 2021-06-08 | 2021-06-08 | Low-rank pulverized coal drying process and system |
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| CN202110638700.3A CN113280616A (en) | 2021-06-08 | 2021-06-08 | Low-rank pulverized coal drying process and system |
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