CN210945520U - Fine slag drying system of coal gas making device - Google Patents
Fine slag drying system of coal gas making device Download PDFInfo
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- CN210945520U CN210945520U CN201921555417.9U CN201921555417U CN210945520U CN 210945520 U CN210945520 U CN 210945520U CN 201921555417 U CN201921555417 U CN 201921555417U CN 210945520 U CN210945520 U CN 210945520U
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Abstract
The utility model discloses a fine slag drying system of a coal gas making device, which comprises a black water concentration system, a fine slag filtering system and a fine slag drying system which are connected in sequence through pipelines; the black water concentration system comprises a high-pressure flash evaporator, a low-pressure flash evaporator and a vacuum flash evaporator which are arranged in sequence, and gas outlets of the high-pressure flash evaporator and the low-pressure flash evaporator are connected with the fine slag drying system through pipelines. The utility model discloses the heat of the high/low pressure flash distillation gas of method make full use of coal gasification system carries out the drying to thin sediment, and the drying procedure is simple relatively, and the thermal efficiency is higher relatively, and energy loss among the dehydration process is low, can realize carrying out reuse to the combustible component in the thin sediment, improves the economic benefits of mill, reaches energy saving and emission reduction's purpose.
Description
Technical Field
The utility model belongs to the technical field of the coal chemical industry, concretely relates to coal system gas device fine slag drying system.
Background
At present, because the energy reserve of China has the characteristics of 'oil shortage, gas shortage and coal existence', the application of coal in the fields of energy and chemical industry is more and more emphasized. The coal gas produced by gasifying coal as a raw material is a clean and efficient coal utilization mode. The gasification method using coal as raw material mainly includes fixed bed, fluidized bed and entrained flow bed, etc., among which entrained flow gasification furnace is the cleanest and most efficient type of coal gasification. The coal is gasified at 1200-1700 ℃, the high temperature ensures the complete gasification of the coal, and the mineral substances in the coal are taken as slag and then leave the gasification furnace.
The entrained flow bed uses a wider range of coal than moving beds and fluidized beds. The entrained-flow bed gasification technology is widely applied to foreign technologies such as coal water slurry gasification technology of American Texaco (which belongs to GE company), Shell (Shell) powder coal pressure gasification technology of Netherlands and GSP powder coal gasification technology of German Siemens, and domestic technologies such as multi-nozzle opposed coal water slurry gasification technology of China eastern university.
In the above technology, a grey water treatment unit is required to be arranged to separate solid and liquid of black water discharged from gasification, and the method generally adopted is flash evaporation, precipitation and filtration. Flash evaporation flow in the existing production device is mainly two-stage or three-stage flash evaporation, precipitation is generally finished by using a settling tank (a clarifying tank), and fine slag filtration is generally performed by adopting vacuum bag type filtration, centrifugal filtration, plate frame type filtration and the like. The water content of the fine slag after filtration is generally 40-60 wt%, and the carbon content in the fine slag is generally 20-40 wt%. For the fine slag, there are generally two treatment methods: one is used as a blending raw material for building materials, construction, roads, backfill engineering and the like, so that combustible components of fine slag cannot be effectively utilized, and resource waste is caused; the other method is to mix the dried fine slag into a pulverized coal boiler for combustion, so that the fuel coal is saved, and the subsequent treatment capacity of the fine slag is reduced, but the water content of the fine ash is too high, and if the drying method is adopted, the occupied area is large, and the environment is polluted.
Chinese patent CN107362614 discloses a method and a device for recycling water-coal-slurry gasified fine slag, which introduces water vapor into a serpentine coil of a slope type solid material drying bed, heats the fine slag to be dried, and takes away the water contained in the fine slag through evaporation to realize the dehydration and drying treatment of the fine slag. The technical route needs to adopt water vapor as a heat source for drying the fine slag, and the energy consumption is large in the process of drying the fine slag, so that the economical efficiency of recycling the fine slag is greatly reduced.
Chinese patent CN107162102 proposes a dehydration drying method for coal gasification system fine slag slurry and a dehydration drying system used therein. According to the method, the air is heated by using the low-pressure flash steam of the coal gasification system, and the concentrated fine slag slurry is dried by using the heated hot air through a spray dehydration drying technology, so that part of waste heat of the low-pressure flash steam can be utilized, and the dried fine slag can be further utilized, and the purposes of energy conservation and emission reduction are achieved. However, the technical scheme has the following problems, which influence the further popularization and application of the technology:
(1) the low-pressure flash steam adopted by the technical scheme heats air, and the heated air is reused for drying fine slag, so that the drying process is complex, the heat loss in the process is large, and the heat efficiency is relatively low.
(2) The scheme adopts air spray drying, and the air pressurized by the air blower needs to consume certain electric energy, so that the energy consumption is relatively high.
(3) Because the heating adopts air, the wet-dried tail gas at the outlet of the spray dryer contains a large amount of air, so that the condensation load of a wet-dried tail gas condenser is high, and the exhaust emission is relatively high.
(4) The pre-dehydration concentration device is a hydrocyclone or a centrifugal filter, and the transformation of most coal gasification devices which are already in operation at present is relatively difficult.
Therefore, at present, a method for dehydrating and drying the fine slag is urgently needed to be found, so that the energy loss in the dehydration process is reduced, the purpose of recycling the combustible components in the fine slag is realized, the economic benefit of a factory is improved, and the purposes of energy conservation and emission reduction are achieved.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a fine sediment drying system of coal system gas device has solved the high problem of fine sediment dehydration energy consumption among the current coal gasification process.
The utility model adopts the technical proposal that the fine slag drying system of the coal gas making device is characterized by comprising a black water concentration system, a fine slag filtering system and a fine slag drying system which are connected in sequence through pipelines;
the black water concentration system comprises a high-pressure flash evaporator, a low-pressure flash evaporator and a vacuum flash evaporator which are sequentially arranged, a discharge port of the high-pressure flash evaporator is connected with a feed port of the low-pressure flash evaporator through a pipeline, a discharge port of the low-pressure flash evaporator is connected with a feed port of the vacuum flash evaporator through a pipeline, a discharge port of the vacuum flash evaporator is connected with the fine slag filtering system through a pipeline, and gas outlets of the high-pressure flash evaporator and the low-pressure flash evaporator are connected with the fine slag drying system through pipelines.
The fine slag filtering system comprises a clarifying tank and a fine slag filtering machine, wherein a feed inlet of the clarifying tank is connected with a discharge outlet of the vacuum flash evaporator through a pipeline, a discharge outlet of the clarifying tank is connected with a feed inlet of the fine slag filtering machine through a pipeline, a water outlet of the fine slag filtering machine is connected with a feed inlet of the clarifying tank through a pipeline, and a discharge outlet of the fine slag filtering machine is connected with a fine slag drying system through a pipeline.
The fine slag drying system comprises a fine slag flash dryer, a feed inlet of the fine slag flash dryer is connected with a discharge outlet of the fine slag filter through a pipeline, and waste gas generated by the fine slag flash dryer enters the waste gas separation system through the pipeline.
A fine slag screw feeder is arranged between the fine slag flash dryer and the fine slag filter.
The fine slag flash evaporation dryer is one or the combination of a rotary dryer and a tubular dryer.
The cavity of the tubular dryer is internally provided with a plurality of drying tubes, fine slag is positioned in the drying tubes, the inner walls of the drying tubes are provided with spiral guide vanes, and drying air is introduced outside the drying tubes.
The cavity of the rotary dryer is internally provided with a plurality of drying tubes, fine slag moves outside the drying tubes, and drying air is introduced into the drying tubes.
The fine slag drying system further comprises a flash separator, dry gas for the fine slag flash dryer enters the flash separator through a pipeline, a water outlet of the flash separator is connected with the waste gas separation system through a pipeline, and a gas outlet of the flash separator is communicated with the outside.
The waste gas separation system comprises a waste gas separator, a waste gas condenser is arranged on a pipeline between the fine slag flash dryer and the waste gas separator, a discharge port of the waste gas separator is connected with a feed port of the grey water tank through a pipeline, and a discharge port of the grey water tank is respectively connected with a water inlet of the high-pressure flash evaporator and a water inlet of the low-pressure flash evaporator through pipelines.
The fine residue filter is one or a combination of a vacuum belt filter, a centrifuge and a plate filter.
The beneficial effects of the utility model are that, the utility model relates to a coal system gas device fine slag drying system, but the heat of make full use of coal gasification system's high/low pressure flash distillation gas carries out the drying to fine slag, and dry flow is simple relatively, and the thermal efficiency is higher relatively, and energy loss among the dehydration process is low, can realize carrying out reuse to the combustible component in the fine slag, improves the economic benefits of mill, reaches energy saving and emission reduction's purpose.
Drawings
FIG. 1 is a schematic structural view of a fine slag drying system of a coal gas production device of the present invention.
In the figure, 1-a high-pressure flash evaporator, 2-a low-pressure flash evaporator, 3-a vacuum flash evaporator, 4-a clarifying tank, 5-a fine slag filter, 6-a fine slag screw feeder, 7-a fine slag flash dryer, 8-a waste gas cooler, 9-a waste gas separator, 10-an ash water tank, 11-a flash separator, 12-a feeding pump and 13-an ash water pump.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
The utility model relates to a fine sediment drying system of coal system gas device, including the concentrated system of black water, fine sediment filtration system and the fine sediment drying system that loop through the pipe connection.
The black water concentration system comprises a high-pressure flash evaporator 1, a low-pressure flash evaporator 2 and a vacuum flash evaporator 3 which are sequentially arranged, a discharge port of the high-pressure flash evaporator 1 is connected with a feed port of the low-pressure flash evaporator 2 through a pipeline, a discharge port of the low-pressure flash evaporator 2 is connected with a feed port of the vacuum flash evaporator 3 through a pipeline, a discharge port of the vacuum flash evaporator 3 is connected with a fine slag filtering system through a pipeline, and gas outlets of the high-pressure flash evaporator 1 and the low-pressure flash evaporator 2 are connected with a fine slag drying system through pipelines.
The fine slag filtering system comprises a clarifying tank 4 and a fine slag filtering machine 5, wherein a feed port of the clarifying tank 4 is connected with a discharge port of the vacuum flash evaporator 3 through a pipeline, a discharge port of the clarifying tank 4 is connected with a feed port of the fine slag filtering machine 5 through a pipeline, a water outlet of the fine slag filtering machine 5 is connected with a feed port of the clarifying tank 4 through a pipeline, and a discharge port of the fine slag filtering machine 5 is connected with a fine slag drying system through a pipeline. A feeding pump 12 is arranged on a pipeline between the clarifying tank 4 and the fine slag filtering machine 5.
The fine slag drying system comprises a fine slag flash dryer 7, a feed inlet of the fine slag flash dryer 7 is connected with a discharge outlet of the fine slag filter 5 through a pipeline, and waste gas generated by the fine slag flash dryer 7 enters the waste gas separation system through the pipeline.
A fine slag screw feeder 6 is arranged between the fine slag flash dryer 7 and the fine slag filter 5.
The fine slag flash dryer 7 is one or a combination of a rotary dryer and a tubular dryer.
The cavity of the tubular dryer is internally provided with a plurality of drying tubes, fine slag is positioned in the drying tubes, the inner walls of the drying tubes are provided with spiral guide vanes, and drying air is introduced outside the drying tubes.
The cavity of the rotary dryer is internally provided with a plurality of drying tubes, fine slag moves outside the drying tubes, and drying air is introduced into the drying tubes.
The fine slag drying system further comprises a flash separator 11, drying air for the fine slag flash dryer 7 enters the flash separator 11 through a pipeline, a water outlet of the flash separator 11 is connected with a feed inlet of the grey water tank 10 through a pipeline, and a gas outlet of the flash separator 11 is communicated with the outside.
The waste gas separation system comprises a waste gas separator 9, a waste gas condenser 8 is arranged on a pipeline between the fine slag flash dryer 7 and the waste gas separator 9, a discharge hole of the waste gas separator 9 is connected with a feed hole of an ash water tank 10 through a pipeline, and a discharge hole of the ash water tank 10 is respectively connected with water inlets of a high-pressure flash evaporator 1 and a low-pressure flash evaporator 2 through pipelines. An ash water pump 13 is arranged on a pipeline connecting the ash water tank 10 with the high-pressure flash evaporator 1 and the low-pressure flash evaporator 2.
The fine residue filter 5 is one or a combination of a vacuum belt filter, a centrifuge and a plate filter.
The system is adopted for drying the fine slag, and is specifically implemented according to the following steps:
step 1, decompressing high-temperature high-pressure solid-containing black water from a coal gas production device, and then sending the decompressed high-pressure black water into a high-pressure flash evaporator, wherein a part of high-pressure flash steam obtained by high-pressure flash evaporation enters a fine slag flash steam dryer, and the other part of the high-pressure flash steam is sent out, the pressure of the high-pressure flash steam is 0.6-1.5 MPaG, and the temperature is 165-205 ℃; the black water concentrated by high-pressure flash evaporation enters a low-pressure flash evaporator for further flash evaporation after being decompressed, wherein the pressure of low-pressure flash evaporation gas is 0.1-0.5 MPaG, and the temperature is 120-160 ℃; part of the low-pressure flash steam flashed from the low-pressure flash evaporator enters a fine slag flash steam dryer, and the other part of the low-pressure flash steam is sent out of the room; the black water after low-pressure flash evaporation concentration enters a vacuum flash evaporator for further flash evaporation, and vacuum flash evaporation gas is sent out.
In order to ensure the cleanliness of the high-pressure flash steam and the low-pressure flash steam, the high-pressure flash steam evaporator and the low-pressure flash steam evaporator are respectively provided with a tower tray, and dust carried in the flash steam is removed by water washing. The water washing can be one or two of boiler feed water and ash water.
And 2, automatically flowing the black water subjected to vacuum flash evaporation to a clarifying tank, overflowing the clear water on the upper part of the clarifying tank into an ash water tank, feeding the fine slag slurry on the bottom of the clarifying tank into a fine slag filter through a feeding pump, feeding the filtrate generated by the fine slag filter into the ash water tank, and feeding the fine slag discharged from the fine slag filter into a fine slag flash evaporation gas dryer through a fine slag screw feeder.
Controlling the solid content in the fine slag slurry to be 5-25 wt%; the water content of the fine slag filter is 30-60 wt%; the grain size of the fine slag filter is less than or equal to 2 mm.
The fine slag flash evaporation gas dryer can be one or the combination of a rotary dryer and a tubular dryer, wherein the tubular dryer is provided with a plurality of drying tubes, helical blades are arranged in the drying tubes, the water-containing fine slag moves in the drying tubes under the guide action of gravity and the helical blades, and flash evaporation gas is introduced outside the drying tubes; the rotary dryer is provided with a plurality of drying tubes, the water-containing fine slag moves outside the drying tubes, and flash evaporation gas is introduced into the drying tubes.
The flash gas can be one or the combination of high-pressure flash gas and low-pressure flash gas in the step 1, and the flash gas amount can be part or all of the high-pressure flash gas and/or the low-pressure flash gas.
The water content of the dried fine slag is 5-15 wt%.
The utility model discloses the method can make full use of coal gasification system's high/low pressure flash distillation gas's heat carries out the drying to thin sediment, and the drying procedure is simple relatively, and the thermal efficiency is higher relatively, and energy loss among the dehydration process is low, can realize carrying out reuse to the combustible component in the thin sediment, improves the economic benefits of mill, reaches energy saving and emission reduction's purpose.
Examples
High-temperature high-pressure solid-containing black water from 6.5MPa coal water slurry gasification enters a high-pressure flash evaporator, the normal operating pressure of high-pressure flash steam is 1.0MPaG, the temperature of the high-pressure flash steam is about 185 ℃, the black water concentrated by high-pressure flash evaporation enters a low-pressure flash evaporator after being decompressed for further flash evaporation, the normal operating pressure of low-pressure flash steam is 0.2MPaG, the temperature of the low-pressure flash steam is about 134 ℃, part of the low-pressure flash steam flashed from the low-pressure flash evaporator enters a fine slag steam drying system, and is distributed outside, the black water concentrated by low-pressure flash evaporation enters a vacuum flash evaporator for further flash evaporation, and the vacuum flash steam is sent outside. In order to ensure the cleanliness of the low-pressure flash steam, the low-pressure flash evaporators are respectively provided with a tower tray, and dust carried in the flash steam is removed by washing with grey water.
The black water after vacuum flash evaporation automatically flows to a clarifying tank, the clear water on the upper part of the clarifying tank overflows and enters an ash water tank, the fine slag slurry on the bottom of the clarifying tank is sent to a fine slag filter by a feeding pump, the fine slag filter is a vacuum belt filter, the flow rate of the fine slag slurry is 28125kg/h, the solid content is 8 wt%, the filtrate generated by a fine slag filtering system enters the ash water tank, the flow rate of the fine slag discharged from the fine slag filter is 4090kg/h, the solid content is 55 wt%, and the fine slag flash evaporation gas enters a fine slag flash gas dryer by a fine slag screw feeder.
About 2000kg/h of low-pressure flash steam is introduced to the outer side of a drying pipe of the fine slag flash steam dryer, the tubular dryer is provided with a plurality of drying pipes, helical blades are arranged in the drying pipes, fine slag with the solid content of 55 wt% moves in the drying pipes under the guide action of gravity and the helical blades, the fine slag discharged from the drying pipes contains 10 wt% of water, the granularity is less than 0.425mm, and the flow rate is about 2500kg/h, and then the fine slag is sent to the outside for recycling. Moisture generated in the fine slag drying process is 1590kg/h, the fine slag is cooled by the waste gas cooler and then enters the waste gas separator, the gas phase is directly discharged to the atmosphere, and the condensate returns to the ash water tank.
The above-mentioned specific embodiments further explain in detail the technical problems and technical solutions of the present invention. It should be understood that the above description is only exemplary of the present invention and is not intended to limit the present invention, and any modifications, equivalents, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (8)
1. A fine slag drying system of a coal gas making device is characterized by comprising a black water concentration system, a fine slag filtering system and a fine slag drying system which are sequentially connected through pipelines;
the black water concentration system comprises a high-pressure flash evaporator (1), a low-pressure flash evaporator (2) and a vacuum flash evaporator (3) which are sequentially arranged, wherein a discharge port of the high-pressure flash evaporator (1) is connected with a feed port of the low-pressure flash evaporator (2) through a pipeline, a discharge port of the low-pressure flash evaporator (2) is connected with a feed port of the vacuum flash evaporator (3) through a pipeline, a discharge port of the vacuum flash evaporator (3) is connected with a fine slag filtering system through a pipeline, and gas outlets of the high-pressure flash evaporator (1) and the low-pressure flash evaporator (2) are connected with a fine slag drying system through pipelines;
the fine slag filtering system comprises a clarifying tank (4) and a fine slag filtering machine (5), wherein a feed inlet of the clarifying tank (4) is connected with a discharge outlet of the vacuum flash evaporator (3) through a pipeline, a discharge outlet of the clarifying tank (4) is connected with a feed inlet of the fine slag filtering machine (5) through a pipeline, a water outlet of the fine slag filtering machine (5) is connected with a feed inlet of the clarifying tank (4) through a pipeline, and a discharge outlet of the fine slag filtering machine (5) is connected with the fine slag drying system through a pipeline;
the fine slag drying system comprises a fine slag flash dryer (7), a feed inlet of the fine slag flash dryer (7) is connected with a discharge outlet of the fine slag filter (5) through a pipeline, and waste gas generated by the fine slag flash dryer (7) enters the waste gas separation system through the pipeline.
2. The fine slag drying system of the coal gas production device according to claim 1, wherein a fine slag screw feeder (6) is arranged between the fine slag flash dryer (7) and the fine slag filter (5).
3. The fine slag drying system of a coal gas plant as claimed in claim 1, characterized in that the fine slag flash dryer (7) is one or a combination of a rotary dryer and a tubular dryer.
4. The system for drying fine slag of a coal gas making device according to claim 3, wherein a plurality of drying tubes are arranged in the cavity of the tubular dryer, the fine slag is located in the drying tubes, spiral guide vanes are arranged on the inner walls of the drying tubes, and drying air is introduced outside the drying tubes.
5. The system of claim 3, wherein the rotary dryer chamber is provided with a plurality of drying tubes, the fine slag moves outside the drying tubes, and the drying gas is introduced into the drying tubes.
6. The fine slag drying system of the coal gas making device according to claim 1, wherein the fine slag drying system further comprises a flash separator (11), drying gas for the fine slag flash dryer (7) enters the flash separator (11) through a pipeline, a water outlet of the flash separator (11) is connected with the waste gas separation system through a pipeline, and a gas outlet of the flash separator (11) is communicated with the outside.
7. The fine slag drying system of the coal gas production device according to claim 1, wherein the waste gas separation system comprises a waste gas separator (9), a waste gas condenser (8) is arranged on a pipeline between the fine slag flash dryer (7) and the waste gas separator (9), a discharge hole of the waste gas separator (9) is connected with a feed hole of the ash water tank (10) through a pipeline, and a discharge hole of the ash water tank (10) is respectively connected with a water inlet of the high-pressure flash evaporator (1) and a water inlet of the low-pressure flash evaporator (2) through a pipeline.
8. The fine slag drying system of the coal gas production device according to claim 1, wherein the fine slag filter (5) is one or a combination of a vacuum belt filter, a centrifuge and a plate and frame filter.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110564455A (en) * | 2019-09-18 | 2019-12-13 | 华陆工程科技有限责任公司 | Fine slag drying method for coal gas making device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110564455A (en) * | 2019-09-18 | 2019-12-13 | 华陆工程科技有限责任公司 | Fine slag drying method for coal gas making device |
| CN110564455B (en) * | 2019-09-18 | 2024-06-14 | 华陆工程科技有限责任公司 | Fine slag drying method for coal gas device |
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