CN114791108A - Method, system and application for treating gasified fine slag - Google Patents
Method, system and application for treating gasified fine slag Download PDFInfo
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- CN114791108A CN114791108A CN202210322698.3A CN202210322698A CN114791108A CN 114791108 A CN114791108 A CN 114791108A CN 202210322698 A CN202210322698 A CN 202210322698A CN 114791108 A CN114791108 A CN 114791108A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L7/00—Supplying non-combustible liquids or gases, other than air, to the fire, e.g. oxygen, steam
- F23L7/007—Supplying oxygen or oxygen-enriched air
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
- F23J15/022—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material for removing solid particulate material from the gasflow
- F23J15/025—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material for removing solid particulate material from the gasflow using filters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/06—Arrangements of devices for treating smoke or fumes of coolers
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Abstract
The invention relates to the technical field of coal chemical industry, and discloses a method, a system and application for treating gasified fine slag. The method comprises the following steps: (1) dehydrating and crushing the gasified fine slag to obtain gasified fine slag powder; (2) the gasified fine slag powder is contacted with oxygen for combustion to obtain flue gas and ash; (3) returning part of the flue gas to the step (1) for carrying the gasified fine slag powder to contact with oxygen for combustion; before combustion, performing element analysis on the gasified fine slag powder, and determining the content of each element in the gasified fine slag powder and the ratio of the content of each element; and adjusting the introduction amount of the flue gas according to the element content and the ratio of the gasified fine slag powder and the feeding amount, so that the oxygen concentration is 30-50 vol% and the excess air coefficient is 1.1-1.2 during combustion. The method can ensure that the gasified fine slag is in an oxygen-increasing atmosphere during combustion, so that the gasified fine slag is stably and fully combusted and is quickly and massively treated, carbon dioxide and water are collected, carbon emission is reduced, and water resources are saved.
Description
Technical Field
The invention relates to the technical field of coal chemical industry, in particular to a method, a system and application for treating gasified fine slag.
Background
The large-scale popularization and utilization of the coal gasification technology enable the preserved quantity and the generated quantity of the coal gasification fine slag to be larger and larger, cause serious resource and land waste and seriously restrict the sustainable development of coal chemical enterprises. However, because the loss on ignition of the gasified fine slag is too high and cannot meet the requirement of building blending raw materials, the gasified fine slag is mainly treated in a landfill mode at present, the volume reduction effect is poor, and the energy is greatly wasted. Meanwhile, the gasified fine slag contains a large amount of water, water resource waste is caused by simple landfill treatment, and secondary pollution is easily caused due to nonstandard or incomplete measures such as seepage prevention and scattering prevention in the landfill process.
The prior art proposes that the combustible part in the gasified fine slag is combusted and reused at high temperature by mixing the gasified fine slag and coal in a low proportion and feeding the mixture into a pulverized coal boiler or a circulating fluidized bed.
CN113566230A discloses a method and a system for realizing direct blending of gasified fine slag in a pulverized coal boiler, which mainly adopts a pressurizing pumping device and a secondary atomizing device to directly introduce the gasified fine slag into a high-temperature area of a hearth, and realizes rapid diffusion and combustion of the gasified fine slag in flue gas by virtue of high-temperature and high-mixing-strength air flow in the hearth.
CN113028418A discloses a system and a method for treating gasified fine slag in a circulating fluidized bed boiler, which proposes to use a feeding and drying device to dry the gasified fine slag and send the dried fine slag into a circulating fluidized bed to be co-fired with coal, thereby realizing the treatment of the gasified fine slag and the water saving, energy saving and efficiency improvement of the system.
Although the method can solve the problems of difficult treatment and energy waste of the gasified fine slag, the gasification fine slag has huge reserve and annual output in China, and the low proportion and the coal have small blending combustion treatment amount, so that the gasification fine slag cannot be quickly and massively treated, the blending combustion of the gasification fine slag and the coal can also bring carbon dioxide emission and pollute the environment, and the obtained ash has high carbon content, so that the gasification fine slag cannot be efficiently treated.
Disclosure of Invention
The invention aims to solve the problems that the rapid and large-scale consumption of the gasified fine slag and the emission of carbon dioxide cannot be realized in the prior art, and provides a method, a system and application for treating the gasified fine slag.
In order to achieve the above object, a first aspect of the present invention provides a method for treating gasified fine slag, comprising:
(1) dehydrating and crushing the gasified fine slag to obtain gasified fine slag powder;
(2) contacting the gasified fine slag powder with oxygen for combustion to obtain flue gas and ash;
(3) returning a portion of the flue gas to (1) for combustion in contact with the oxygen carrying the gasified fine slag powder;
before combustion, performing element analysis on the gasified fine slag powder, determining the content and the ratio of elements, and inputting the content and the ratio into a control system;
and controlling a system output signal and adjusting the amount of the flue gas according to the element content, the ratio and the feeding amount of the gasified fine slag powder, and controlling the oxygen concentration to be 30-50 vol% and the excess air coefficient to be 1.1-1.2 during combustion.
The invention provides a system for treating gasified fine slag, which is characterized by comprising a drier 3, a bin 5, a boiler 8, a heat exchanger 11, a bag-type dust collector 12, a flue gas fan 18, an oxygen blower 19 and a control system 21;
the outlet of the drier 3 is communicated with the inlet of the storage bin 5 and is used for dehydrating the gasified fine slag;
an outlet of the storage bin 5 is communicated with an inlet of the boiler 8 and is used for crushing the dehydrated gasified fine slag;
an outlet of the flue gas fan 18 is communicated with an inlet of the storage bin 5 and is used for pneumatically conveying the crushed gasified fine slag to the boiler 8;
an outlet of the boiler 8 is communicated with an inlet of the bag-type dust collector 12 through the heat exchanger 11 and is used for burning gasified fine slag;
the outlet of the heat exchanger 11 is communicated with the inlet of the boiler 8 and is used for feeding the oxygen subjected to heat exchange into the boiler for combustion;
the outlet of the oxygen blower 19 is communicated with the inlet of the heat exchanger 11 for supplying oxygen;
the control system 21 is in communication with the oxygen blower 19 and the flue gas blower 18 for controlling the concentration of oxygen and the excess air factor in the boiler 8.
In a third aspect, the invention provides a method for processing the gasified fine slag in the first aspect and/or a system for processing the gasified fine slag in the second aspect, and the system is applied to the processing of the gasified fine slag.
Through the technical scheme, the method, the system and the application for treating the gasified fine slag provided by the invention have the following beneficial effects:
1. controlling the oxygen concentration to be 30-50 vol% and controlling the excess air coefficient in the hearth to be 1.1-1.2 by a control system according to the feeding amount of the gasified fine slag powder and the analysis of fuel elements, so that the gasified fine slag can be ensured to be in an oxygen-enriched atmosphere, the ignition and burnout of the gasified fine slag can be enhanced and promoted, and the stable and full combustion of the gasified fine slag can be ensured;
2. the high-concentration carbon dioxide flue gas dedusted by the bag-type dust remover enters a condenser and is separated out by a gas-liquid separator, so that carbon dioxide capture is realized, carbon dioxide emission is reduced, carbon content of ash is not more than 5 wt%, and subsequent resource utilization is facilitated; meanwhile, water generated in the process of drying the gasified fine slag and water generated in the process of drying the flue gas after condensation and gas-liquid separation are sent into a water storage tank, so that the recovery of water resources is realized.
Drawings
FIG. 1 is a schematic view of a system for treating gasified fine slag.
Description of the reference numerals
1, a residue slurry machine; 2 gasifying the fine slag conveying pipeline; 3, a drying machine; 4, a dried water collecting pipeline; 5, a stock bin; 6, a gasification fine slag conveying pipeline at the outlet of the bin; 7, a water storage tank; 8, a boiler; 9 a slag collector; 10 flue gas condensate water collecting pipeline; 11 a heat exchanger; 12, a bag-type dust collector; 13, a flue gas pipeline at the outlet of the bag-type dust collector; 14 flue gas condenser; 15 carbon dioxide gas storage tank; 16 gas-liquid separator; 17 a recycling flue gas inlet pipeline of the induced draft fan; 18a recirculating flue gas blower; a 19 pure oxygen blower; 20 an oxygen supply conduit; 21 a control system; 22 silo air supply inlet ducts.
Detailed Description
The endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and these ranges or values should be understood to encompass values close to these ranges or values. For numerical ranges, each range between its endpoints and individual point values, and each individual point value can be combined with each other to give one or more new numerical ranges, and such numerical ranges should be construed as specifically disclosed herein.
The invention provides a method for treating gasified fine slag, which is characterized by comprising the following steps:
(1) dehydrating and crushing the gasified fine slag to obtain gasified fine slag powder;
(2) contacting the gasified fine slag powder with oxygen for combustion to obtain flue gas and ash;
(3) returning part of the flue gas to the step (1) for carrying the gasified fine slag powder to contact with the oxygen for combustion;
before combustion, performing element analysis on the gasified fine slag powder, and determining the content of each element in the gasified fine slag powder and the ratio of the content of each element;
controlling the feeding amount of the gasified fine slag powder and the introduction amount of the flue gas returned to the step (1) in the step (3) according to the content of each element in the gasified fine slag powder and the ratio of the content of each element, so that the oxygen concentration during combustion is 30-50 vol%, and the excess air coefficient is 1.1-1.2.
According to the invention, the oxygen concentration is controlled to be 30-50 vol% by a control system according to the feeding amount and element (C, H, O, N, S) analysis of the gasified fine slag, the excess air coefficient in the hearth is controlled to be 1.1-1.2, the gasified fine slag can be ensured to be in an oxygen-enriched atmosphere, the ignition and burnout of the gasified fine slag can be enhanced and promoted, the stable and sufficient combustion of the gasified fine slag can be ensured, the carbon content of the obtained ash slag is lower, and the high-efficiency treatment and subsequent resource utilization of the gasified fine slag are facilitated.
According to the invention, the source of the gasified fine slag is not particularly limited, and the gasified fine slag involved in the embodiment of the invention is a high-water-content filter cake obtained by wet removal of coal chemical gasification fly ash.
In the invention, the dry-based fixed carbon content of the high-water-content filter cake is more than 20 wt%, the water content is 50-70 wt%, and the particle size is not more than 500 mu m.
According to the invention, the water content of the gasified fine slag powder is 10-30 wt%.
According to the invention, the grain size of the gasified fine slag powder is not more than 100 μm.
According to the invention, the temperature of the flue gas is 150-250 ℃.
Further, the method also comprises the step of carrying out heat exchange on the flue gas and the oxygen so that the temperature of the oxygen in the step (2) is 200-300 DEG C
In the present invention, when the temperature during combustion after heat exchange satisfies the above range, ignition and combustion of the gasified fine slag in the furnace can be promoted.
According to the invention, the flue gas is subjected to gas-liquid separation to obtain dry flue gas.
According to the invention, the concentration of carbon dioxide in the dry flue gas is not less than 95 vol%.
The invention provides a system for treating gasified fine slag, which is characterized by comprising a drier 3, a storage bin 5, a boiler 8, a bag-type dust collector 12, a flue gas fan 18, an oxygen blower 19 and a control system 21;
conveying the gasified fine slag to the drier 3 for dehydration;
an inlet of the bin 5 is communicated with an outlet of the drier 3 and is used for crushing the dehydrated gasified fine slag to obtain gasified fine slag powder;
the inlet of the flue gas fan 18 is communicated with the outlet of the bag-type dust collector 12, the outlet of the flue gas fan 18 is communicated with the inlet of the storage bin 5, and the flue gas fan is used for circularly using flue gas generated during combustion for pneumatic conveying of gasified fine slag powder in the storage bin 5;
an inlet of the boiler 8 is communicated with the bunker 5 and is used for combusting the gasified fine slag powder to obtain a gas-solid mixture containing flue gas and ash;
an inlet of the bag-type dust collector 12 is communicated with an outlet of the boiler 8 and is used for separating the gas-solid mixture to obtain flue gas and ash;
the oxygen blower 19 is communicated with the boiler 8 and used for providing oxygen required by combustion;
the control system 21 is respectively communicated with the oxygen blower 19 and the flue gas blower 18 and is used for controlling the feeding amount of the gasified fine slag powder and the introduction amount of the flue gas returned to the step 1 in the step 3, so that the oxygen concentration during combustion is 30-50 vol%, and the excess air coefficient is 1.1-1.2.
According to the invention, the system further comprises: the system comprises a slag slurry machine 1, a water storage tank 7, a slag collector 9, a heat exchanger 11, a flue gas condenser 14, a carbon dioxide gas storage tank 15 and a gas-liquid separator 16;
wherein, the outlet of the slag pulp machine 1 is communicated with the inlet of the drier 3 and is used for conveying the gasified fine slag to the drier 3 and dehydrating the gasified fine slag to the water content of 10-30 wt%;
the water storage tank 7 is communicated with the drying machine 3 and is used for storing water removed from the gasified fine slag;
the slag collector 9 is arranged at the bottom of the boiler 8 and is used for collecting the burned slag;
the heat exchanger 11 is communicated with an inlet of the boiler 8 and is used for feeding the oxygen subjected to heat exchange into the boiler 8;
the inlet of the flue gas condenser 14 is communicated with the outlet of the bag-type dust collector 12 and is used for condensing the flue gas;
the inlet of the gas-liquid separator 16 is communicated with the outlet of the flue gas condenser 14, and is used for performing gas-liquid separation on the condensed flue gas;
an outlet of the gas-liquid separator 16 is communicated with a carbon dioxide gas storage tank 15, and separated gas enters the carbon dioxide gas storage tank 15;
the gas-liquid separator 16 is communicated with the water storage tank 7, and the separated water enters the water storage tank 7.
In the invention, high-concentration carbon dioxide flue gas dedusted by a bag-type dust remover enters a condenser and is separated from carbon dioxide by a gas-liquid separator, so that carbon dioxide capture is realized and carbon dioxide emission is reduced; meanwhile, water generated in the process of drying the gasified fine slag and water generated in the flue gas after condensation and gas-liquid separation are sent into a water storage tank, so that the recovery of water resources is realized.
According to the invention, the system further comprises: the gasification fine slag powder conveying pipeline 2, the bin outlet gasification fine slag conveying pipeline 6, the flue gas condensate water collecting pipeline 10, the bag-type dust remover outlet flue gas pipeline 13, the draught fan flue gas inlet pipeline 17 and the bin air supply inlet pipeline 22 are respectively used for communicating two different devices.
One embodiment of the present invention: as shown in figure 1 of the drawings, in which,
an outlet of the slag slurry machine 1 is communicated with an inlet of the drier 3 through a gasified fine slag powder conveying pipeline 2 and is used for conveying the gasified fine slag to the drier 3 and dehydrating the gasified fine slag until the water content is 10-30 wt%;
the water storage tank 7 is communicated with the drier 3 through a dried water collecting pipeline 4 and is used for storing water removed from the gasified fine slag;
an inlet of the bin 5 is communicated with an outlet of the drier 3 and is used for crushing the dehydrated gasified fine slag into gasified fine slag powder with the particle size not greater than 100 mu m;
an inlet of the flue gas fan 18 is communicated with an outlet of the bag-type dust collector 12 through a recirculated flue gas inlet pipeline 17 of the induced draft fan, and an outlet of the flue gas fan 18 is communicated with an inlet of the storage bin 5 through an oxygen supply pipeline 22 and used for circularly using flue gas generated during combustion for pneumatic conveying of gasified fine slag powder in the storage bin 5;
an inlet of the boiler 8 is communicated with the bin 5 through a bin outlet gasification fine slag conveying pipeline 6 and is used for combusting the gasification fine slag powder to obtain a gas-solid mixture containing flue gas and ash;
the slag collector 9 is arranged at the bottom of the boiler 8 and is used for collecting the burned slag;
the outlet of the oxygen blower 19 is communicated with the inlet of the heat exchanger 11 for supplying oxygen;
the outlet of the heat exchanger 11 is communicated with the inlet of the boiler 8 and is used for sending oxygen with the temperature of 200-300 ℃ after heat exchange into the boiler for combustion
The inlet of the bag-type dust collector 12 is communicated with the outlet of the heat exchanger 11 and is used for separating the gas-solid mixture to obtain flue gas and ash;
an inlet of the flue gas condenser 14 is communicated with an outlet of the bag-type dust collector 12 through a bag-type dust collector outlet flue gas pipeline 13, and is used for condensing flue gas;
the inlet of the gas-liquid separator 16 is communicated with the outlet of the flue gas condenser 14, and is used for performing gas-liquid separation on the condensed flue gas;
an outlet of the gas-liquid separator 16 is communicated with a carbon dioxide gas storage tank 15, and separated gas enters the carbon dioxide gas storage tank 15;
the gas-liquid separator 16 is communicated with the water storage tank 7 through a flue gas condensed water collecting pipeline 10, and the separated water enters the water storage tank 7
The control system 21 is respectively communicated with the oxygen blower 19 and the flue gas blower 18 and is used for controlling the feeding amount of the gasified fine slag powder and the introduction amount of the flue gas returned to the step 1 in the step 3, so that the oxygen concentration during combustion is 30-50 vol%, and the excess air coefficient is 1.1-1.2.
In a third aspect, the invention provides a method for processing the gasified fine slag in the first aspect and/or a system for processing the gasified fine slag in the second aspect, and the system is applied to the processing of the gasified fine slag.
The present invention will be described in detail below by way of examples.
Gasification fine slag, particle size: less than 500 μm;
industrial analysis: received base Water content (M) ar )69.7 wt.%, dry basis ash content (A) d )47.3 wt.%, dry basis volatile content (V) d )4.1 wt%, fixed carbon content on dry basis (FC) d )48.6wt％；
Elemental analysis: dry basis carbon content (C) d )50.19 wt%, dry basis hydrogen element content (H) d )0.46 wt%, dry basis nitrogen element content (N) d )0.42 wt%, dry basis sulfur element content (S) d )1.52wt％。
Example 1
As shown in fig. 1, an outlet of the slag slurry machine 1 is communicated with an inlet of the dryer 3 through a gasification fine slag powder conveying pipeline 2, and is used for conveying the gasification fine slag to the dryer 3 to dehydrate the gasification fine slag to a water content of 20 wt%;
the water storage tank 7 is communicated with the drier 3 through a dried water collecting pipeline 4 and is used for storing water removed from the gasified fine slag;
an inlet of the stock bin 5 is communicated with an outlet of the drier 3 and is used for crushing the dehydrated gasified fine slag into gasified fine slag powder with the particle size of 100 mu m or less;
an inlet of the flue gas fan 18 is communicated with an outlet of the bag-type dust collector 12 through a recirculated flue gas inlet pipeline 17 of the induced draft fan, and an outlet of the flue gas fan 18 is communicated with an inlet of the storage bin 5 through an oxygen supply pipeline 22 and used for circularly using flue gas generated during combustion for pneumatic conveying of gasified fine slag powder in the storage bin 5;
an inlet of the boiler 8 is communicated with the bunker 5 through a bunker outlet gasification fine slag conveying pipeline 6 and is used for combusting the gasification fine slag powder to obtain a gas-solid mixture containing flue gas and ash;
the slag collector 9 is arranged at the bottom of the boiler 8 and is used for collecting the burned slag;
the outlet of the oxygen blower 19 is communicated with the inlet of the heat exchanger 11 for supplying oxygen;
the outlet of the heat exchanger 11 is communicated with the inlet of the boiler 8 and is used for feeding oxygen with the temperature of 300 ℃ after heat exchange into the boiler for combustion
An inlet of the bag-type dust collector 12 is communicated with an outlet of the heat exchanger 11 and is used for separating the gas-solid mixture to obtain flue gas and ash;
an inlet of the flue gas condenser 14 is communicated with an outlet of the bag-type dust collector 12 through a bag-type dust collector outlet flue gas pipeline 13, and is used for condensing flue gas;
the inlet of the gas-liquid separator 16 is communicated with the outlet of the flue gas condenser 14, and is used for performing gas-liquid separation on the condensed flue gas to obtain dry flue gas;
an outlet of the gas-liquid separator 16 is communicated with a carbon dioxide gas storage tank 15, and the dry flue gas is conveyed to the carbon dioxide gas storage tank 15 for storage;
the gas-liquid separator 16 is communicated with the water storage tank 7 through a flue gas condensed water collecting pipeline 10, and the separated water enters the water storage tank 7
The control system 21 is respectively communicated with the oxygen blower 19 and the flue gas blower 18, and is used for controlling the feeding amount of the gasified fine slag powder and the introduction amount of the flue gas returned to the step 1 in the step 3, so that the oxygen concentration during combustion is 50 vol%, and the excess air coefficient is 1.2.
Finally, the concentration of carbon dioxide in the dry flue gas is 95 vol%, the system can realize effective treatment of the gasified fine slag, and the carbon content of the obtained ash is 3.5 wt%, so that the system can be used for subsequent resource utilization.
Example 2
In accordance with the method of example 1, except that the oxygen concentration at the time of combustion was controlled to 40 vol%.
Finally, the carbon dioxide concentration in the dry flue gas is 95 vol%, and the carbon content of the obtained ash is 4 wt%.
Example 3
In accordance with the method of example 1, except that the excess air ratio at the time of combustion was controlled to be 1.1.
Finally, the carbon dioxide concentration in the dry flue gas is 96 vol%, and the carbon content of the obtained ash is 4.5 wt%.
Comparative example 1
In accordance with the method of example 1, except that the oxygen concentration at the time of combustion was controlled to 20 vol%.
The carbon dioxide concentration in the dry flue gas is 94 vol%, the carbon content of the obtained ash is 8 wt%, and even the stable treatment of the gasified fine slag can not be realized.
Comparative example 2
In accordance with the method of example 1, except that the excess air ratio at the time of combustion was controlled to 1.
The concentration of carbon dioxide in the dry flue gas is 93 vol%, the carbon content of the obtained ash is 8 wt%, and even the stable treatment of the gasified fine slag can not be realized.
The results of the embodiments 1 to 4 show that the method and the system for treating the gasified fine slag provided by the invention can obtain good technical effects, the concentration of the carbon dioxide is more than 95 vol%, the carbon content of the obtained ash slag is not more than 5 wt%, the system can realize effective treatment of the gasified fine slag, and the carbon dioxide and water are collected and utilized, so that the emission of the carbon dioxide is reduced, and the water resource is saved.
Compared examples 1-2 which do not satisfy the technical scheme of the invention, the concentration of carbon dioxide is below 95 vol%, and the carbon content of the obtained ash is high, thus being not beneficial to subsequent resource utilization, and even failing to realize the stable treatment of gasified fine slag.
The preferred embodiments of the present invention have been described above in detail, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, many simple modifications can be made to the technical solution of the invention, including combinations of various technical features in any other suitable way, and these simple modifications and combinations should also be regarded as the disclosure of the invention, and all fall within the scope of the invention.
Claims (10)
1. A method of treating gasified fine slag, the method comprising:
(1) dehydrating and crushing the gasified fine slag to obtain gasified fine slag powder;
(2) contacting the gasified fine slag powder with oxygen for combustion to obtain flue gas and ash;
(3) returning part of the flue gas to the step (1) for carrying the gasified fine slag powder to contact with the oxygen for combustion;
before combustion, performing element analysis on the gasified fine slag powder, and determining the content of each element in the gasified fine slag powder and the ratio of the content of each element;
controlling the feeding amount of the gasified fine slag powder and the introduction amount of the flue gas returned to the step (1) in the step (3) according to the content of each element in the gasified fine slag powder and the ratio of the content of each element, so that the oxygen concentration during combustion is 30-50 vol%, and the excess air coefficient is 1.1-1.2.
2. A method according to claim 1, wherein the moisture content of the gasified fine slag powder is 10-30 wt.%, preferably 10-20 wt.%.
3. The method of claim 1 or 2, wherein the particle size of the gasified fine slag powder is not greater than 100 μm.
4. The method as claimed in any one of claims 1 to 3, wherein the temperature of the flue gas is 150 ℃ and 250 ℃.
5. The method as claimed in any one of claims 1 to 4, wherein the flue gas and the oxygen gas are heat exchanged so that the temperature of the oxygen gas in step (2) is 200-300 ℃.
6. The method according to any one of claims 1-5, wherein the method further comprises: carrying out gas-liquid separation on the flue gas to obtain dry flue gas;
preferably, the concentration of carbon dioxide in the dry flue gas is not less than 95 vol%.
7. The system for treating the gasified fine slag is characterized by comprising a drying machine (3), a storage bin (5), a boiler (8), a bag-type dust collector (12), a flue gas fan (18), an oxygen blower (19) and a control system (21);
conveying the gasified fine slag to the drier (3) for dehydration;
an inlet of the bin (5) is communicated with an outlet of the drier (3) and is used for crushing the dehydrated gasified fine slag to obtain gasified fine slag powder;
the inlet of the flue gas fan (18) is communicated with the outlet of the bag-type dust collector (12), the outlet of the flue gas fan (18) is communicated with the inlet of the storage bin (5), and the flue gas generated during combustion is circularly used for pneumatic conveying of gasified fine slag powder in the storage bin (5);
the inlet of the boiler (8) is communicated with the stock bin (5) and is used for burning the gasified fine slag powder to obtain a gas-solid mixture containing flue gas and ash;
the inlet of the bag-type dust collector (12) is communicated with the outlet of the boiler (8) and is used for separating the gas-solid mixture to obtain flue gas and ash;
the oxygen blower (19) is communicated with the boiler (8) and is used for providing oxygen required by combustion;
and the control system (21) is respectively communicated with an oxygen blower (19) and a flue gas blower (18) and is used for controlling the feeding amount of the gasified fine slag powder and the introduction amount of the flue gas returned to the step (1) in the step (3), so that the oxygen concentration during combustion is 30-50 vol%, and the excess air coefficient is 1.1-1.2.
8. The system of claim 7, wherein the system further comprises: the system comprises a slag slurry machine (1), a water storage tank (7), a slag collector (9), a heat exchanger (11), a flue gas condenser (14), a carbon dioxide gas storage tank (15) and a gas-liquid separator (16);
the slag pulp grinder (1) is communicated with an inlet of the drier (3) and is used for conveying gasified fine slag to the drier (3);
the water storage tank (7) is communicated with the drying machine (3) and is used for storing water removed from the gasified fine slag;
the slag collector (9) is arranged at the bottom of the boiler (8) and is used for collecting the burned slag;
the heat exchanger (11) is communicated with an inlet of the boiler (8) and is used for feeding oxygen subjected to heat exchange into the boiler (8);
the inlet of the flue gas condenser (14) is communicated with the outlet of the bag-type dust collector (12) and is used for condensing the flue gas;
the inlet of the gas-liquid separator (16) is communicated with the outlet of the flue gas condenser (14) and is used for carrying out gas-liquid separation on the condensed flue gas;
an outlet of the gas-liquid separator (16) is communicated with a carbon dioxide gas storage tank (15), and separated gas enters the carbon dioxide gas storage tank (15);
the gas-liquid separator (16) is communicated with the water storage tank (7), and separated water enters the water storage tank (7).
9. The system of claim 7 or 8, wherein the system further comprises: the device comprises a gasification fine slag powder conveying pipeline (2), a bin outlet gasification fine slag conveying pipeline (6), a flue gas condensate water collecting pipeline (10), a bag-type dust remover outlet flue gas pipeline (13), a draught fan flue gas inlet pipeline (17) and a bin air supply inlet pipeline (22) which are respectively used for communicating two different devices.
10. Use of a method for treating gasified fine slag according to any one of claims 1 to 6 and/or a system for treating gasified fine slag according to any one of claims 7 to 9 in a gasification fine slag treatment.
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