CN112029538B - Coupling gasification system and method for pulverized coal and lump coal - Google Patents
Coupling gasification system and method for pulverized coal and lump coal Download PDFInfo
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- CN112029538B CN112029538B CN202010826951.XA CN202010826951A CN112029538B CN 112029538 B CN112029538 B CN 112029538B CN 202010826951 A CN202010826951 A CN 202010826951A CN 112029538 B CN112029538 B CN 112029538B
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
- C10J3/02—Fixed-bed gasification of lump fuel
- C10J3/20—Apparatus; Plants
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
- C10J3/46—Gasification of granular or pulverulent flues in suspension
- C10J3/48—Apparatus; Plants
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J2300/00—Details of gasification processes
- C10J2300/09—Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
- C10J2300/0913—Carbonaceous raw material
- C10J2300/093—Coal
Abstract
The present disclosure relates to a coupling gasification system and method of pulverized coal and lump coal, the system includes a lump coal gasification furnace and a pulverized coal gasification furnace; the pulverized coal gasification furnace is provided with a pulverized coal gasification reaction cavity, a pulverized coal inlet and a gasification agent inlet; the lump coal gasification furnace is provided with a lump coal gasification reaction cavity, a lump coal inlet, a gas inlet, a slag discharge port and a crude gas outlet; the gas inlet is communicated with the pulverized coal gasification reaction cavity, so that gas generated by reaction in the pulverized coal gasification reaction cavity enters the lump coal gasification reaction cavity from the gas inlet and is subjected to gasification reaction with lump coal; the slag discharging port is communicated with the pulverized coal gasification reaction cavity, so that solid particles generated by reaction in the lump coal gasification reaction cavity enter the pulverized coal gasification reaction cavity from the slag discharging port to be subjected to combustion and gasification reaction, the pulverized coal and the lump coal are gasified together, the situation that the supply and demand of the pulverized coal and the lump coal are uneven is balanced, and the coal utilization rate and the conversion rate are improved.
Description
Technical Field
The disclosure relates to the technical field of coal gasification, in particular to a system and a method for coupling and gasifying pulverized coal and lump coal.
Background
The coal gasification technology is an important way for clean and efficient utilization of coal.
Along with the higher and higher mechanization strength of coal mining, the coal pulverization rate is gradually enhanced, namely the coal powder mining rate is improved. Most of coal gasification technologies which are most widely applied at present adopt lump coal, so that pulverized coal in many coal mines cannot be effectively treated and is seriously accumulated, and the condition that the supply of the lump coal cannot be met exists in a gasification factory.
Therefore, how to gasify the pulverized coal and the lump coal together to balance the uneven supply and demand of the pulverized coal and the lump coal becomes a problem to be solved urgently.
Disclosure of Invention
To solve the above technical problem or at least partially solve the above technical problem, the present disclosure provides a system and a method for coupled gasification of pulverized coal and lump coal.
In a first aspect, the present disclosure provides a coupled gasification system of pulverized coal and lump coal, comprising a lump coal gasification furnace and a pulverized coal gasification furnace;
the pulverized coal gasification furnace is provided with a pulverized coal gasification reaction cavity, a pulverized coal inlet through which pulverized coal can enter the pulverized coal gasification reaction cavity, and a gasifying agent inlet through which a gasifying agent can enter the pulverized coal gasification reaction cavity;
the lump coal gasification furnace is provided with a lump coal gasification reaction cavity, a lump coal inlet at least allowing lump coal to enter the lump coal gasification reaction cavity, and a gas inlet, a slag discharge port and a crude gas outlet which are respectively communicated with the lump coal gasification reaction cavity;
the gas inlet is communicated with the pulverized coal gasification reaction cavity, so that gas generated by reaction in the pulverized coal gasification reaction cavity enters the lump coal gasification reaction cavity from the gas inlet and is subjected to gasification reaction with the lump coal; the slag discharging port is communicated with the pulverized coal gasification reaction cavity, so that solid particles generated by reaction in the lump coal gasification reaction cavity enter the pulverized coal gasification reaction cavity through the slag discharging port to generate combustion and gasification reaction.
Optionally, the inner diameter of the lump coal gasification reaction cavity is larger than the inner diameter of the pulverized coal gasification reaction cavity.
Optionally, the lump coal inlet is disposed at the top of the lump coal gasification furnace, and the gas inlet is disposed at the bottom of the lump coal gasification furnace.
Optionally, the lump coal gasification furnace is arranged above the pulverized coal gasification furnace.
Optionally, a first distribution plate is arranged at the gas inlet;
the first distribution plate is respectively communicated with the pulverized coal gasification reaction cavity and the lump coal gasification reaction cavity, so that gas generated by reaction in the pulverized coal gasification reaction cavity enters the lump coal gasification reaction cavity through the first distribution plate.
Optionally, a second distribution plate is further disposed above the first distribution plate, and the second distribution plate and the first distribution plate are disposed at an interval;
the second distribution plate is respectively communicated with the first distribution plate and the lump coal gasification reaction cavity, so that gas generated by reaction in the pulverized coal gasification reaction cavity sequentially passes through the first distribution plate and the second distribution plate and enters the lump coal gasification reaction cavity.
Optionally, the second distribution plate is a conical distribution plate with a large upper end and a small lower end;
the first distribution plate is a conical distribution plate with a small upper end and a large lower end.
Optionally, a slag discharging pipe is further arranged in the lump coal gasification furnace, and the slag discharging port is located at an outlet end of the slag discharging pipe, so that solid particles generated by reaction in the lump coal gasification reaction cavity are discharged to the pulverized coal gasification reaction cavity through the slag discharging pipe;
the deslagging pipe is positioned between the first distribution plate and the second distribution plate, the inlet end of the deslagging pipe is connected with the second distribution plate, and the outlet end of the deslagging pipe is connected with the first distribution plate.
Optionally, the lump coal gasification furnace further has a gas supplement port communicated with the lump coal gasification reaction cavity, so as to supplement steam or carbon monoxide and hydrogen to the lump coal gasification reaction cavity through the gas supplement port.
Optionally, the lump coal gasification furnace further has an oxygen supplement port communicated with the lump coal gasification reaction cavity, so as to supplement oxygen into the lump coal gasification reaction cavity through the oxygen supplement port.
Optionally, the lump coal gasification furnace is a moving bed gasification furnace;
the pulverized coal gasification furnace is a fluidized bed gasification furnace.
In a second aspect, the present disclosure provides a method for performing coupled gasification of pulverized coal and lump coal by using the coupled gasification system of pulverized coal and lump coal as described above, the method comprising:
at least introducing pulverized coal and a gasifying agent into a pulverized coal gasification reaction cavity of a pulverized coal gasification furnace so as to enable at least the pulverized coal and the gasifying agent to generate combustion and gasification reaction in the pulverized coal gasification reaction cavity;
at least introducing lump coal into a lump coal gasification reaction cavity of a lump coal gasification furnace, and introducing gas generated by reaction in the pulverized coal gasification reaction cavity into the lump coal gasification reaction cavity so as to enable at least the lump coal and the gas to generate gasification reaction in the lump coal gasification reaction cavity;
and introducing solid particles generated by reaction in the lump coal gasification reaction cavity into the pulverized coal gasification reaction cavity so as to at least enable the solid particles, the pulverized coal and the gasifying agent to generate combustion and gasification reaction in the pulverized coal gasification reaction cavity.
Optionally, the introducing at least lump coal into the lump coal gasification reaction cavity of the lump coal gasification furnace includes:
loading a catalyst on the surface of the lump coal;
and introducing the lump coal loaded with the catalyst into the lump coal gasification reaction cavity.
Optionally, after the lump coal loaded with the catalyst is introduced into the lump coal gasification reaction cavity, the method further includes:
and supplementing carbon monoxide and hydrogen into the lump coal gasification reaction cavity.
Optionally, when the steam content in the gas introduced into the lump coal gasification reaction cavity is lower than a preset steam content threshold, the method further includes:
and introducing steam into the lump coal gasification reaction cavity.
Optionally, when the temperature of the steam introduced into the lump coal gasification reaction cavity is lower than a preset temperature threshold, the method further includes:
and introducing oxygen into the lump coal gasification reaction cavity.
Compared with the prior art, the technical scheme provided by the embodiment of the disclosure has the following advantages:
the system and the method for coupled gasification of pulverized coal and lump coal provided by the embodiment of the disclosure enable the pulverized coal and the gasifying agent to generate combustion and gasification reaction in a pulverized coal gasification reaction cavity by introducing the pulverized coal and the gasifying agent into the pulverized coal gasification reaction cavity of the pulverized coal gasification furnace, so as to realize gasification of the pulverized coal; the lump coal is introduced into the lump coal gasification reaction cavity of the lump coal gasification furnace, and the gas generated by the reaction in the pulverized coal gasification reaction cavity is introduced into the lump coal gasification reaction cavity to generate gasification reaction with the lump coal, so that the gasification agent required by the gasification reaction is provided for the lump coal gasification furnace, the gas generated by the pulverized coal gasification furnace is effectively utilized while the lump coal gasification is realized, a gasification agent supply source is not required to be additionally arranged for the lump coal gasification furnace, the cost is saved to a certain extent, meanwhile, the gas generated by the pulverized coal gasification furnace is further reacted, the sufficiency of the reaction is improved, the content of effective gas in the crude gas finally discharged from the crude gas outlet is improved, the dust content in the crude gas is reduced, and the investment for purifying the crude gas in the follow-up process is reduced; in addition, solid particles generated by reaction in the lump coal gasification reaction cavity are introduced into the pulverized coal gasification reaction cavity, so that the solid particles further generate gasification reaction in the pulverized coal gasification reaction cavity, namely, secondary reaction, and the overall gasification efficiency is improved. That is to say, the coupled gasification system and the coupled gasification method for pulverized coal and lump coal provided by the embodiments of the present disclosure realize the co-gasification of the pulverized coal and the lump coal, so that both the lump coal and the pulverized coal can be used as raw materials for coal gasification, the co-gasification realizes the coal gas conversion, the accumulation of the pulverized coal is avoided, the situation of uneven supply and demand of the pulverized coal and the lump coal is balanced, and the utilization and conversion efficiency of the coal is improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure.
In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present disclosure, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.
FIG. 1 is a schematic structural diagram of a coupled gasification system for pulverized coal and lump coal according to an embodiment of the present disclosure;
FIG. 2 is a schematic structural diagram illustrating a coupled gasification system of pulverized coal and lump coal provided with a gas replenishment port according to an embodiment of the present disclosure;
fig. 3 is a schematic flow chart of a method for coupled gasification of pulverized coal and lump coal according to an embodiment of the present disclosure.
Wherein, 1, lump coal gasification furnace; 10. an air chamber; 11. a lump coal gasification reaction cavity; 12. a lump coal inlet; 13. a gas inlet; 14. a slag discharge pipe; 141. a slag discharge port; 15. a crude gas outlet; 16. a first distribution plate; 17. a second distribution plate; 18. a gas replenishment port; 19. a lump coal feed system; 2. a pulverized coal gasification furnace; 20. an air chamber; 21. a pulverized coal gasification reaction cavity; 22. a pulverized coal inlet; 23. a gasification agent inlet; 24. a third distribution board; 25. a residue discharge port; 26. a pulverized coal feed system.
Detailed Description
In order that the above objects, features and advantages of the present disclosure may be more clearly understood, aspects of the present disclosure will be further described below. It should be noted that the embodiments and features of the embodiments of the present disclosure may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present disclosure, but the present disclosure may be practiced in other ways than those described herein; it is to be understood that the embodiments disclosed in the specification are only a few embodiments of the present disclosure, and not all embodiments.
Fig. 1 is a schematic structural diagram of a coupled gasification system of pulverized coal and lump coal according to an embodiment of the present disclosure. Referring to fig. 1, the present embodiment provides a coupled gasification system of pulverized coal and lump coal, in which the pulverized coal and lump coal can be co-gasified, that is, both the pulverized coal and lump coal can be used as raw materials for coal gasification and are gasified together in the system, so as to balance the situation of uneven supply and demand of the pulverized coal and lump coal, and improve the utilization and conversion efficiency of coal.
This fine coal and lump coal's coupling gasification system includes: lump coal gasification furnace 1 and pulverized coal gasification furnace 2. The pulverized coal gasification furnace 2 has a pulverized coal gasification reaction chamber 21, a pulverized coal inlet 22 through which pulverized coal can enter the pulverized coal gasification reaction chamber 21, and a gasifying agent inlet 23 through which a gasifying agent can enter the pulverized coal gasification reaction chamber 21.
The lump coal gasification furnace 1 is provided with a lump coal gasification reaction cavity 11, a lump coal inlet 12 which can at least allow lump coal to enter the lump coal gasification reaction cavity 11, and a gas inlet 13, a slag discharge port 141 and a crude gas outlet 15 which are respectively communicated with the lump coal gasification reaction cavity 11. The gas inlet 13 is communicated with the pulverized coal gasification reaction cavity 21, so that gas generated by reaction in the pulverized coal gasification reaction cavity 21 enters the lump coal gasification reaction cavity 11 from the gas inlet 13 and is subjected to gasification reaction with lump coal; the slag discharging port 141 is communicated with the pulverized coal gasification reaction cavity 21, so that solid particles generated by reaction in the lump coal gasification reaction cavity 11 enter the pulverized coal gasification reaction cavity 21 from the slag discharging port 141 to be combusted and gasified.
Specifically, the pulverized coal and gasifying agent introduced into the pulverized coal gasification furnace 2 undergo combustion and gasification reactions in the pulverized coal gasification reaction chamber 21. The gasifying agents required for the gasification of pulverized coal can specifically include: oxygen and steam. The pulverized coal in the pulverized coal gasification reaction cavity 21 generates a combustion reaction of oxygen and pulverized coal therein and a gasification reaction of carbon and steam in the pulverized coal at a certain temperature. The oxygen and the steam can share one gasifying agent inlet 23, that is, both the oxygen and the steam are introduced into the pulverized coal gasification reaction chamber 21 through the gasifying agent inlet 23. Of course, it is also possible to make the gasifying agent inlet 23 include an oxygen inlet through which oxygen is introduced into the pulverized coal gasification reaction chamber 21 and a steam inlet through which steam is introduced into the pulverized coal gasification reaction chamber 21. The amount of oxygen and steam introduced and the amount of pulverized coal added may be set according to actual requirements, and this embodiment is not particularly limited.
The lump coal introduced into the lump coal gasification furnace 1 is subjected to gasification reaction in the lump coal gasification reaction cavity 11. Specifically, as the gas inlet 13 of the lump coal gasification furnace 1 is communicated with the pulverized coal gasification reaction cavity 21, gas generated by reaction in the pulverized coal gasification reaction cavity 21 enters the lump coal gasification reaction cavity 11 through the gas inlet 13 and performs gasification reaction with the gas entering from the gas inlet 13, the pulverized coal gasification reaction cavity 21 provides a gasification agent required by the reaction for the lump coal gasification reaction cavity 11, and crude gas generated by final reaction is discharged through the crude gas outlet 15. Solid particles generated by reaction in the lump coal gasification reaction cavity 11 enter the pulverized coal gasification reaction cavity 21 through the slag discharge port 141, and are combusted and gasified together with reactants in the pulverized coal gasification reaction cavity 21, so that the solid particles are further subjected to gasification reaction, the conversion efficiency is further improved, gas generated by the gasification reaction further enters the lump coal gasification furnace 1 through the gas inlet 13, and the process is continuously carried out until the reaction is finished. The addition amount of the lump coal can be specifically set according to actual requirements, and is not particularly limited in this embodiment.
That is, the pulverized coal and the lump coal are respectively gasified in the pulverized coal gasification furnace 2 and the lump coal gasification furnace 1, the high-temperature gas generated by the pulverized coal gasification reaction enters the lump coal gasification reaction cavity 11, and the solid particles generated by the gasification reaction in the lump coal gasification reaction cavity 11 fall into the pulverized coal gasification reaction cavity 21. Wherein the solid particles comprise lump coal residue.
Wherein, the gas generated by the reaction of the pulverized coal gasification reaction cavity 21 specifically comprises: carbon dioxide, carbon monoxide, water, hydrogen, methane, and the like.
During the concrete implementation, can set up fine coal feed system 26, provide fine coal in to fine coal gasification reaction chamber 21 through fine coal feed system 26, the feed inlet of fine coal feed system 26 is equivalent to above-mentioned fine coal entry 22, through setting up fine coal feed system 26 for the addition volume and the rate of addition of fine coal are controlled more easily. The lump coal feeding system 19 can be further arranged, lump coal is provided for the lump coal gasification reaction cavity 11 through the lump coal feeding system 19, a feeding hole of the lump coal feeding system 19 is equivalent to the lump coal inlet 12, and the addition amount and the addition speed of the lump coal are easier to control through the lump coal feeding system 19.
In this embodiment, the lump coal gasification furnace 1 is preferably a moving bed gasification furnace, and the pulverized coal gasification furnace 2 is preferably a fluidized bed gasification furnace, so that the sufficiency of the reaction in the lump coal gasification reaction chamber 11 and the pulverized coal gasification reaction chamber 21 can be further improved, and the conversion rates of the lump coal and the pulverized coal can be further improved. In other implementations, the lump coal gasification furnace 1 may be a fixed bed, and the pulverized coal gasification furnace 2 may be a gasification bed.
In the coupled gasification system of pulverized coal and lump coal provided by this embodiment, by arranging the pulverized coal gasification furnace 2 and the lump coal gasification furnace 1, the pulverized coal and the gasifying agent are introduced into the pulverized coal gasification reaction cavity 21 of the pulverized coal gasification furnace 2, so that the pulverized coal and the gasifying agent are subjected to combustion and gasification reaction in the pulverized coal gasification reaction cavity 21, and the gasification of the pulverized coal is realized; lump coal is introduced into the lump coal gasification reaction cavity 11 of the lump coal gasification furnace 1, gas generated by reaction in the pulverized coal gasification reaction cavity 21 is introduced into the lump coal gasification reaction cavity 11 to generate gasification reaction with the lump coal, so that a gasification agent required by the gasification reaction is provided for the lump coal gasification furnace 1, the gas generated by the pulverized coal gasification furnace 2 is effectively utilized while lump coal gasification is realized, a gasification agent supply source is not required to be additionally arranged for the lump coal gasification furnace 1, the cost is saved to a certain extent, meanwhile, the gas generated by the pulverized coal gasification furnace 2 is further reacted, the reaction sufficiency is improved, the content of effective gas in crude gas finally discharged from the crude gas outlet 15 is improved, the dust content in the crude gas is reduced, and the investment for subsequent purification of the crude gas is reduced; in addition, solid particles generated by reaction in the lump coal gasification reaction cavity 11 are introduced into the pulverized coal gasification reaction cavity 21, so that the solid particles further generate gasification reaction in the pulverized coal gasification reaction cavity 21, namely secondary reaction, and the overall gasification efficiency is improved. That is to say, the coupled gasification system of pulverized coal and lump coal provided by this embodiment realizes the co-gasification of the pulverized coal and the lump coal, so that both the lump coal and the pulverized coal can be used as raw materials for coal gasification, the co-gasification realizes the coal gas conversion, the accumulation of the pulverized coal is avoided, the situation of uneven supply and demand of the pulverized coal and the lump coal is balanced, and the utilization and conversion efficiency of the coal is improved.
In a specific implementation, the lump coal inlet 12 may be disposed at the top of the lump coal gasification furnace 1, and the gas inlet 13 may be disposed at the bottom of the lump coal gasification furnace 1, so that the moving direction of the lump coal fed from the lump coal inlet 12 is opposite to the moving direction of the gas entering from the gas inlet 13, and thus the reaction rate of the lump coal under strong thermal shock is increased.
The raw gas outlet 15 may be disposed at an upper sidewall of the lump coal gasification reaction chamber 11 to discharge raw gas. The slag discharge port 141 may be specifically disposed at the bottom of the lump coal gasification reaction chamber 11.
In the present embodiment, lump coal gasification furnace 1 is specifically disposed above pulverized coal gasification furnace 2. Due to the upward movement of the gas, the gas generated by the reaction in the pulverized coal gasification furnace 2 can enter the lump coal gasification reaction cavity 11 more quickly and easily; and solid particles generated by the reaction of the lump coal gasification reaction cavity 11 flow downwards under the action of gravity, so that the solid particles can enter the pulverized coal gasification reaction cavity 21 more quickly and easily.
Further, a first distribution plate 16 is provided at the gas inlet 13. The first distribution plate 16 is respectively communicated with the pulverized coal gasification reaction cavity 21 and the lump coal gasification reaction cavity 11, so that gas generated by reaction in the pulverized coal gasification reaction cavity 21 enters the lump coal gasification reaction cavity 11 through the first distribution plate 16. It can be understood that the gas generated in the pulverized coal gasification reaction cavity 21 enters the lump coal gasification reaction cavity 11 through the gas holes on the first distribution plate 16, so that the gas can more uniformly enter the lump coal gasification reaction cavity 11, the reaction uniformity and reaction rate are improved, and the conversion rate is further improved.
It is also possible to arrange a second distribution plate 17 above the first distribution plate 16, the second distribution plate 17 being arranged spaced apart from the first distribution plate 16. The second distribution plate 17 is respectively communicated with the first distribution plate 16 and the lump coal gasification reaction cavity 11, so that gas generated by reaction in the pulverized coal gasification reaction cavity 21 sequentially passes through the first distribution plate 16 and the second distribution plate 17 and enters the lump coal gasification reaction cavity 11. That is, the gas generated by the reaction in the pulverized coal gasification reaction chamber 21 firstly enters from the air holes of the first distribution plate 16, flows upwards, and then enters into the lump coal gasification reaction chamber 11 from the air holes of the second distribution plate 17. Namely, the gas pressure is adjusted through the secondary distribution plate, so that the gas can enter the lump coal gasification reaction cavity 11 more smoothly and uniformly, the reaction uniformity and the reaction rate are improved, and the conversion rate is improved.
Referring to fig. 1, the second distribution plate 17 may be a conical distribution plate with a large upper end and a small lower end. The first distribution plate 16 is provided as a tapered distribution plate having a small upper end and a large lower end. Therefore, the area of the distribution plate can be increased under the condition of a certain space, and the gas adjusting effect of the distribution plate is better.
During specific implementation, the slag discharging pipe 14 can be arranged in the lump coal gasification furnace 1, and the slag discharging port 141 is located at the outlet end of the slag discharging pipe 14, so that solid particles generated by reaction in the lump coal gasification reaction cavity 11 are discharged to the pulverized coal gasification reaction cavity 21 through the slag discharging pipe 14. Wherein, the slag discharge pipe 14 can be arranged at the bottom of the lump coal gasification reaction cavity 11 and near the middle.
In the present embodiment, the slag discharging pipe 14 is specifically located between the first distribution plate 16 and the second distribution plate 17, an inlet end of the slag discharging pipe 14 is connected to the second distribution plate 17, and an outlet end of the slag discharging pipe 14 is connected to the first distribution plate 16. Specifically, the gas generated by the reaction in the pulverized coal gasification reaction chamber 21 enters the gas chamber 10 formed between the first distribution plate 16 and the second distribution plate 17 through the first distribution plate 16, is uniformly mixed in the gas chamber 10, and then enters the lump coal gasification reaction chamber 11 through the second distribution plate 17. The fixed granule that produces in the lump coal gasification reaction chamber 11 can be along the downward landing of inclined plane of second distribution plate 17 to enter into to arrange the sediment pipe 14 by the entry end of arranging sediment pipe 14, and then enter into to fine coal gasification reaction chamber 21 by the exit end of arranging sediment pipe 14 in, make like this to arrange the sediment more smoothly. In the actual reaction, when the slag discharge pipe 14 does not discharge slag, part of the gas may also enter the lump coal gasification reaction chamber 11 through the slag discharge port 141.
The gasifying agent inlet 23 of the pulverized coal gasification furnace 2 can be arranged at the bottom of the pulverized coal gasification furnace 2, so that the gasifying agent entering from the gasifying agent inlet 23 can be fully contacted with the pulverized coal, and the reaction is more sufficient. Specifically, the gasification agent inlet 23 is further provided with a third distribution plate 24, and the gasification agent entering from the gasification agent inlet 23 passes through the third distribution plate 24 and then enters the pulverized coal gasification reaction chamber 21, so that the gasification agent entering the pulverized coal gasification reaction chamber 21 is more uniform. The gas chamber 20 is formed between the gasifying agent inlet 23 and the third distribution plate 24, for example, oxygen enters from the oxygen inlet, steam enters from the steam inlet, oxygen and steam enter into the gas chamber 20, are mixed in the gas chamber 20, and then enter into the pulverized coal gasification reaction chamber 21 from the air holes of the third distribution plate 24. Specifically, the pulverized coal gasification furnace 2 further has a residue discharge port 25, the residue discharge port 25 communicates with the pulverized coal gasification reaction chamber 21, and the residue after the reaction in the pulverized coal gasification reaction chamber 21 can be discharged through the residue discharge port 25.
Preferably, the inner diameter of the lump coal gasification reaction cavity 11 is larger than the inner diameter of the pulverized coal gasification reaction cavity 21, so that the reaction in the lump coal gasification reaction cavity 11 is more sufficient, and the conversion rate is improved. Referring to fig. 1, the inside diameter of the lump coal gasification reaction chamber 11 is the lateral dimension of the lump coal gasification reaction chamber 11 in fig. 1, and the inside diameter of the pulverized coal gasification reaction chamber 21 is the lateral dimension of the pulverized coal gasification reaction chamber 21 in the drawing.
Preferably, the temperature in the pulverized coal gasification reaction cavity 21 can be controlled to be 1000-1300 ℃, and the pressure is controlled to be 0.5-6 MPa. The pressure in the lump coal gasification reaction cavity 11 can be controlled between 0.5MPa and 6MPa, and the temperature is controlled between 800 ℃ and 1100 ℃.
Because the specific surface area of the lump coal is small, the area of contact with steam in the gasifying agent is far smaller than that of the pulverized coal, in order to improve the gasification reaction rate of the lump coal, a certain amount of catalyst can be loaded on the surface of the lump coal firstly, the purpose of the catalyst is to increase the reaction activity of the lump coal and the gasification reaction rate, and the specific type and the catalysis principle of the catalyst are specifically described in the following.
Fig. 2 is a schematic structural diagram of a coupled gasification system of pulverized coal and lump coal according to an embodiment of the present disclosure when a gas replenishment port is provided. Referring to fig. 2, a gas replenishment port 18 communicating with the lump coal gasification reaction chamber 11 may be provided in the lump coal gasification furnace 1 to replenish steam into the lump coal gasification reaction chamber 11 through the gas replenishment port 18. For example, when the carbon content of the coal is high and the activity of the reaction of generating carbohydrate with steam is high, the steam content in the gas generated in the pulverized coal gasification reaction chamber 21 is insufficient, and then the steam can be supplemented into the lump coal gasification reaction chamber 11 through the gas supplementing opening 18. In a specific implementation, the gas supplementing opening 18 may be formed on the side wall of the gas chamber 10, so that the supplemented steam is firstly mixed with other gas in the gas chamber 10 and then enters the lump coal gasification reaction chamber 11 through the second distribution plate 17. In addition, carbon monoxide and hydrogen can also be supplemented through the gas supplementing opening 18 to improve the conversion rate of the lump coal gasification reaction cavity 11. In this case, the carbon monoxide and hydrogen gas may enter from the same gas supply port 18, or the gas supply port 18 may include two, one being a carbon monoxide supply port and one being a hydrogen supply port.
In addition, the lump coal gasification furnace 1 further has an oxygen supply port communicating with the lump coal gasification reaction chamber 11 to supply oxygen into the lump coal gasification reaction chamber 11 through the oxygen supply port. For example, when the temperature of the supplemented steam is low, so that the temperature of the lump coal gasification reaction chamber 11 does not reach the preset temperature, part of oxygen can be supplemented into the lump coal gasification reaction chamber 11 through the oxygen supplementing port, for example, the temperature requirement of the catalyst activity can be ensured to be met.
In this embodiment, the gas supplementing opening 18 and the oxygen supplementing opening are the same, that is, oxygen can enter the lump coal gasification reaction chamber 11 through the gas supplementing opening 18. Of course, a gas supply port 18 and an oxygen supply port may be provided, respectively, and steam may be supplied into the lump coal gasification reaction chamber 11 through the gas supply port 18, and oxygen may be supplied into the lump coal gasification reaction chamber 11 through the oxygen supply port.
With continued reference to fig. 1 and 2, the coupled gasification system of pulverized coal and lump coal of the present embodiment is further described below by way of specific examples:
the temperature of the reaction cavity of the pulverized coal gasification furnace 2 positioned below is controlled to be 1000-1300 ℃, the pressure is controlled to be 0.5-6 MPa, raw material pulverized coal is introduced into the pulverized coal gasification reaction cavity 21 from a pulverized coal inlet 22 at the bottom of the pulverized coal gasification furnace 2, steam and oxygen are uniformly sprayed into the pulverized coal gasification reaction cavity 21 through a third distribution plate 24, so that the pulverized coal in the reaction cavity generates combustion reaction of oxygen and pulverized coal and gasification reaction of coal and steam at high temperature, further all inert carbon (the inert carbon is from the pulverized coal and residual carbon after reaction of the lump coal gasification furnace 1 above) generates more gas products through combustion or gasification reaction, meanwhile, the residual ash is melted at high temperature, and is agglomerated into larger particles to be discharged out of the furnace from a residue discharge port 25 of the pulverized coal gasification furnace 2. The gas generated by gasification in the pulverized coal gasification reaction cavity 21 is discharged from an outlet at the top of the pulverized coal gasification furnace 2, enters the lump coal gasification reaction cavity 11 at the upper part from a gas inlet 13 communicated with the outlet, and passes through a two-stage distribution plate in the form of a fluidized medium with the high-temperature gas at the lower part: the first distribution plate 16 and the second distribution plate 17 (the pressure of the high-temperature gas is adjusted by the two-stage distribution plate, so that the high-temperature gas can smoothly enter the lump coal gasification reaction cavity 11 from the distribution plate instead of entering the lump coal gasification reaction cavity 11 through the slag discharge pipe 14) into the lump coal gasification reaction cavity 11 above. Wherein the ratio of the lower gasification agent steam to the lower feeding pulverized coal can be 0.5-3 (mass ratio), and the ratio of the lower gasification agent oxygen to the lower feeding pulverized coal is 0.3-0.6 (mass ratio).
The pressure of the upper high-temperature lump coal gasification reaction cavity 11 is controlled to be 0.5MPa to 6MPa, and the temperature is controlled to be 800 ℃ to 1100 ℃. The specific surface area of the lump coal is small, so that the contact area with the gasifying agent steam is far smaller than that of the pulverized coal, the gasifying reaction rate of the lump coal is further lower than that of the pulverized coal, and in order to solve the problem of inconsistent consumption rates of the lump coal and the pulverized coal, a certain amount of catalyst is loaded on the surface of the lump coal, so that the reaction activity of the lump coal is increased, and the gasifying reaction rate is increased. The type of catalyst may be alkali metal and alkaline earth metal, or a solution, ore, etc. containing alkali metal and alkaline earth metal. The catalyst can be mixed with the lump coal in a dry mixing and/or spraying mode, and the loading amount of the catalyst ranges from 0.1 to 50 percent (the mass of the catalyst accounts for the mass percent of the lump coal). The lump coal loaded with the catalyst is added into the lump coal gasification reaction cavity 11 above from the lump coal feeding system 19 at the top, the surface active functional groups are instantly activated under the action of thermal shock of the coal in the lump coal gasification reaction cavity 11, meanwhile, the catalyst ions have certain fluidity under the high-temperature condition, and the active functional groups rapidly capture the catalyst ions to generate more active binding sites which are active site carbon-catalysts. Under the action of a catalyst, a gasification agent (gas after reaction in the lower pulverized coal gasification reaction cavity 21 contains water, carbon dioxide, carbon monoxide, hydrogen and methane) performs a methanation reaction with strong heat release in a gas phase to synthesize more methane from the carbon monoxide and the hydrogen in the gas phase of the pulverized coal gasification reaction cavity 21 under the action of the catalyst, the released heat promotes the carbohydrate reaction of the carbon-catalyst intermediate of the coal particles, so that solid carbon in the upper lump coal gasification reaction cavity 11 is converted into gas-phase carbon monoxide and hydrogen, and simultaneously the combination of the carbon dioxide in the gasification agent and the active site carbon-catalyst intermediate in the lump coal in the upper lump coal gasification reaction cavity 11 is reduced into more carbon monoxide, thereby generating more methane and carbon monoxide. With the consumption of the available carbon on the surface of the lump coal, the catalyst metal ions can carry out secondary migration along with the steam, since the lump coal feeding system 19 is arranged at the uppermost part of the lump coal gasification furnace 1, the direction of the material movement is opposite to the direction of the gasification agent, when the lump coal is fed from the feeding system into the upper cube coal gasification reaction cavity 11, the lump coal is rapidly subjected to pyrolysis reaction under strong thermal shock, pyrolysis gas generated by pyrolysis can rapidly form rich topological pore canals in the lump coal, so that the specific surface area of the lump coal is greatly increased, the fresh coal functional groups in the rich pore channels can quickly capture the catalyst with secondary migration, therefore, methanation and carbon dioxide reduction reaction not only occur on the surface of the lump coal, but also most of catalytic reaction occurs inside the lump coal, and the reaction rate and the reaction activity of the upper gasification section are increased.
The size of the abrasion lump coal which is reacted for a certain time and moves downwards is gradually reduced, when the diameter of the lump coal is smaller than a certain size, small-particle lump coal residues containing the catalyst fall into the lower pulverized coal gasification reaction cavity 21 through the slag discharge pipe 14 to participate in the lower high-temperature combustion and gasification reaction, and heat and high-temperature gasification agents are provided for the whole system. The catalyst residue particles entering the pulverized coal gasification reaction chamber 21 are mixed with the feeding pulverized coal. Optionally, in the process of mechanical mining, coal with higher brittleness is easier to pulverize due to different brittleness of coal of different layers, and ash in coal composition is a component with highest brittleness, so that the pulverized coal contains higher ash component, while coal ash contains a large amount of mineral substances such as alkali metal and alkaline earth metal oxide, the substance has better catalytic activity, and residue particles falling from the lump coal gasification reaction cavity 11 contain more supported catalyst, and the temperature of the lower pulverized coal gasification reaction cavity 21 is higher, so that the activity of catalyst migration is enhanced, and the catalyst is partially migrated to the surface of fresh pulverized coal particles from the residue particles and is combined with functional group active sites of the pulverized coal particles to promote and catalyze catalytic combustion and catalytic gasification reaction of the lower reaction cavity, thereby improving the gasification efficiency of the lower reaction cavity.
In the lower pulverized coal gasification reaction cavity 21, as the carbon in the pulverized coal particles and the carbon in the residual carbon particles are completely consumed, the catalyst ions react with the ash in the coal particles, and the acidic oxides and the basic oxides in the ash are subjected to low-temperature eutectic reaction under the action of the basic metal ions, so that on one hand, the ash is more easily agglomerated into ash particles and is discharged out of the furnace through the residue discharge port 25. On the other hand, the low-temperature eutectic product is oxidized into stable aluminosilicate with a metal salt structure (stable rock components in the nature) under the aerobic condition at the bottom, so that the discharged slag does not contain any alkali metal and alkaline earth metal, and does not have any pollution and harm to the nature and the environment. Optionally, for some coal types with high thermal fragmentation (easily crushed into small particles under the action of thermal shock after entering the furnace), the lump coal loads the catalyst and also loads a part of catalyst, that is, the part (dry method or wet method) of the catalyst loaded on the lump coal easily generates low-temperature co-melting with the coal ash, such as an iron-based catalyst or a manganese-based catalyst, on one hand, the gasification rate and activity are improved, and more importantly, the surface of the crushed coal particles is more easily subjected to partial low-temperature co-melting (the ash on the surface of the coal particles and the catalyst generate low-temperature co-melting), and then the crushed coal particles are mutually bonded into coal particles with slightly large mass, so that excessive coal powder is prevented from being brought into the lump coal gasification reaction chamber 11.
When the carbon content of the coal is high and the activity of the carbon-water reaction with the steam is high, the steam content in the gasification agent generated below in the high-temperature lump coal gasification reaction cavity 11 is insufficient or the conversion rate of the lump coal in the lump coal gasification reaction cavity 11 is to be improved, and then part of the steam can be supplemented into the lump coal gasification reaction cavity 11 through the gas supplementing opening 18. Further, when the temperature of the supplemented steam is lower, so that the temperature of the upper lump coal gasification reaction cavity 11 does not reach 800-1100 ℃, partial oxygen can be supplemented into the lump coal gasification reaction cavity 11 to ensure that the temperature requirement of the catalyst activity is met. Further optionally, when the content of the catalyst (such as potassium carbonate and the like) for promoting gas methanation in the catalyst composition in the lump coal gasification reaction cavity 11 is high, in order to further improve the conversion rate of the lump coal gasification reaction cavity 11, part of the carbon monoxide and hydrogen separated by the post system may be returned to the gasification furnace (where the carbon monoxide and hydrogen may be carbon monoxide and hydrogen circularly returned from the gasification furnace outlet, or carbon monoxide and hydrogen provided by other systems mainly undergo a chemical reaction in which three hydrogen and one carbon monoxide are synthesized into one methane and water while releasing a large amount of reaction heat), and the large amount of reaction heat released while generating more methane in the furnace by virtue of the catalytic activity of the methanation catalyst is provided to the lump coal in the lump coal gasification reaction cavity 11 for gasification reaction.
The proportion of effective gas in the crude gas generated by the system treatment provided by the embodiment is high, and particularly the ratio of carbon monoxide to methane is far higher than that of the conventional gasification. Meanwhile, as the moving bed is arranged above the fluidized bed and the fluidized bed is arranged below the fluidized bed, solid carry-over substances (coal particles and catalyst particles) of the fluidized bed can be effectively filtered by the bed layer of the moving bed, so that the dust content in the crude gas at the outlet is greatly reduced, the pressure of subsequent system purification is reduced, and the investment of subsequent treatment is saved.
Through adding a proper amount of catalyst in the lump coal gasification area, the ability of the lump coal for capturing the catalyst is improved by utilizing the characteristics of the lump coal in form, and the residue of the lump coal is subjected to secondary treatment through high-temperature combustion, so that the efficiency of the overall gasification is improved, and meanwhile, the catalyst is solidified in the high-temperature slag discharge process, so that the slag discharge is cleaner and pollution-free. Because the cleanliness of the outlet coal gas is high (high temperature and no tar, the moving bed filters the carry-over of the fluidized bed), the investment of the process is greatly reduced compared with the traditional process.
Fig. 3 is a schematic flow chart of a method for coupled gasification of pulverized coal and lump coal according to an embodiment of the present disclosure. Referring to fig. 3, this embodiment further provides a method for coupled gasification of pulverized coal and lump coal, which may be performed by part or all of the system for coupled gasification of pulverized coal and lump coal according to the above embodiment, so as to realize the co-gasification of pulverized coal and lump coal, balance the situation of uneven supply and demand of pulverized coal and lump coal, and improve the utilization and conversion efficiency of coal.
With reference to fig. 1 to 3, the following describes a method for coupled gasification of pulverized coal and lump coal by using a specific embodiment, where the method specifically includes:
s101, at least introducing pulverized coal and a gasifying agent into the pulverized coal gasification reaction cavity 21 of the pulverized coal gasification furnace 2 so as to enable the pulverized coal and the gasifying agent to generate combustion and gasification reactions in the pulverized coal gasification reaction cavity 21.
S102, at least introducing lump coal into the lump coal gasification reaction cavity 11 of the lump coal gasification furnace 1, and introducing gas generated by reaction in the pulverized coal gasification reaction cavity 21 into the lump coal gasification reaction cavity 11 so as to enable at least the lump coal and the gas to generate gasification reaction in the lump coal gasification reaction cavity 11.
Here, the introduction of the lump coal into the lump coal gasification reaction chamber 11 may be performed simultaneously with the introduction of the pulverized coal into the pulverized coal gasification reaction chamber 21. Or, the pulverized coal and the gasifying agent may be introduced into the pulverized coal gasification reaction chamber 21, and after the gasification reaction in the pulverized coal gasification reaction chamber 21 is performed for a certain time, the lump coal may be introduced into the lump coal gasification reaction chamber 11.
S103, introducing solid particles generated by reaction in the lump coal gasification reaction cavity 11 into the pulverized coal gasification reaction cavity 21 so as to enable at least the solid particles, pulverized coal and a gasifying agent to generate combustion and gasification reaction in the pulverized coal gasification reaction cavity 21.
It can be understood that the gas generated by the gasification reaction of the solid particles, the pulverized coal and the gasifying agent further enters the lump coal gasification reaction cavity 11 through the gas inlet 13 to participate in the reaction.
In the step S102, the introducing of at least lump coal into the lump coal gasification reaction chamber 11 of the lump coal gasification furnace 1 may specifically include:
firstly, a catalyst is loaded on the surface of the lump coal, and then the lump coal loaded with the catalyst is introduced into the lump coal gasification reaction cavity 11.
Specifically, when the steam content in the gas introduced into the lump coal gasification reaction chamber 11 is lower than a preset steam content threshold value or in order to improve the lump coal conversion rate of the lump coal gasification reaction chamber 11, the method further comprises: and introducing steam into the lump coal gasification reaction cavity 11. The preset steam content threshold value can be set according to actual conditions.
Further, when the temperature of the steam introduced into the lump coal gasification reaction chamber 11 is lower than a preset temperature threshold, the method further comprises: and introducing oxygen into the lump coal gasification reaction cavity 11. The preset temperature threshold value can be set according to actual conditions.
In addition, after the lump coal loaded with the catalyst is introduced into the lump coal gasification reaction chamber 11, the method may further include:
and supplementing carbon monoxide and hydrogen into the lump coal gasification reaction cavity 11.
For example, the carbon monoxide and hydrogen separated by the post-system can be partially returned to the gasifier (the carbon monoxide and hydrogen here can be the carbon monoxide and hydrogen circularly returned from the gasifier outlet, or the carbon monoxide and hydrogen provided by other systems mainly undergo a chemical reaction of synthesizing one methane and water with three hydrogen and one carbon monoxide and release a large amount of reaction heat at the same time), and a large amount of reaction heat simultaneously released by generating more methane in the furnace depending on the catalytic activity of the methanation catalyst is provided to the lump coal in the lump coal gasification reaction cavity 11 for gasification reaction, thereby further improving the conversion rate of the lump coal gasification reaction cavity 11.
According to the coupling gasification method of the pulverized coal and the lump coal, the pulverized coal and the gasifying agent are introduced into the pulverized coal gasification reaction cavity of the pulverized coal gasification furnace, so that the pulverized coal and the gasifying agent are subjected to combustion and gasification reaction in the pulverized coal gasification reaction cavity, and the gasification of the pulverized coal is realized; the lump coal is introduced into the lump coal gasification reaction cavity of the lump coal gasification furnace, and the gas generated by the reaction in the pulverized coal gasification reaction cavity is introduced into the lump coal gasification reaction cavity to generate gasification reaction with the lump coal, so that the gasification agent required by the gasification reaction is provided for the lump coal gasification furnace, the gas generated by the pulverized coal gasification furnace is effectively utilized while the lump coal gasification is realized, a gasification agent supply source is not required to be additionally arranged for the lump coal gasification furnace, the cost is saved to a certain extent, meanwhile, the gas generated by the pulverized coal gasification furnace is further reacted, the sufficiency of the reaction is improved, the content of effective gas in the crude gas finally discharged from the crude gas outlet is improved, the dust content in the crude gas is reduced, and the investment for purifying the crude gas in the follow-up process is reduced; in addition, solid particles generated by reaction in the lump coal gasification reaction cavity are introduced into the pulverized coal gasification reaction cavity, so that the solid particles further generate gasification reaction in the pulverized coal gasification reaction cavity, namely, secondary reaction, and the overall gasification efficiency is improved. That is to say, the method provided by the embodiment realizes the co-gasification of the pulverized coal and the lump coal, so that both the lump coal and the pulverized coal can be used as coal gasification raw materials, the co-gasification realizes the coal gas conversion, the accumulation of the pulverized coal is avoided, the situation of uneven supply and demand of the pulverized coal and the lump coal is balanced, and the utilization and conversion efficiency of the coal is improved.
The specific principles and other technical features are the same as those of the above embodiments and can achieve the same or similar technical effects, and therefore, detailed descriptions thereof are omitted, and specific references can be made to the description of the above embodiments.
It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The foregoing are merely exemplary embodiments of the present disclosure, which enable those skilled in the art to understand or practice the present disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the disclosure. Thus, the present disclosure is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (14)
1. A coupling gasification system of pulverized coal and lump coal is characterized by comprising a lump coal gasification furnace (1) and a pulverized coal gasification furnace (2);
the pulverized coal gasification furnace (2) is provided with a pulverized coal gasification reaction cavity (21), a pulverized coal inlet (22) for allowing pulverized coal to enter the pulverized coal gasification reaction cavity (21) and a gasifying agent inlet (23) for allowing a gasifying agent to enter the pulverized coal gasification reaction cavity (21);
the lump coal gasification furnace (1) is provided with a lump coal gasification reaction cavity (11), a lump coal inlet (12) which can at least allow lump coal to enter the lump coal gasification reaction cavity (11), and a gas inlet (13), a slag discharge port (141) and a crude gas outlet (15) which are respectively communicated with the lump coal gasification reaction cavity (11);
the gas inlet (13) is communicated with the pulverized coal gasification reaction cavity (21) so that gas generated by reaction in the pulverized coal gasification reaction cavity (21) enters the lump coal gasification reaction cavity (11) from the gas inlet (13) and is subjected to gasification reaction with the lump coal; the slag discharging port (141) is communicated with the pulverized coal gasification reaction cavity (21) so that solid particles generated by reaction in the lump coal gasification reaction cavity (11) enter the pulverized coal gasification reaction cavity (21) from the slag discharging port (141) to be combusted and gasified;
a first distribution plate (16) is arranged at the gas inlet (13), a second distribution plate (17) is arranged above the first distribution plate (16), and the second distribution plate (17) and the first distribution plate (16) are arranged at intervals; the second distribution plate (17) is respectively communicated with the first distribution plate (16) and the lump coal gasification reaction cavity (11), so that gas generated by reaction in the pulverized coal gasification reaction cavity (21) sequentially passes through the first distribution plate (16) and the second distribution plate (17) and enters the lump coal gasification reaction cavity (11).
2. The coupling gasification system of pulverized coal and lump coal as claimed in claim 1, wherein the inside diameter of the lump coal gasification reaction chamber (11) is larger than the inside diameter of the pulverized coal gasification reaction chamber (21).
3. The coupled gasification system of pulverized coal and lump coal as claimed in claim 1, wherein the lump coal inlet (12) is provided at the top of the lump coal gasifier (1), and the gas inlet (13) is provided at the bottom of the lump coal gasifier (1).
4. The coupled gasification system of pulverized coal and lump coal as claimed in any one of claims 1 to 3, wherein the lump coal gasifier (1) is disposed above the pulverized coal gasifier (2).
5. The coupled gasification system of pulverized coal and lump coal as claimed in claim 1, wherein said second distribution plate (17) is a conical distribution plate with a large upper end and a small lower end;
the first distribution plate (16) is a conical distribution plate with a small upper end and a large lower end.
6. The coupling gasification system of pulverized coal and lump coal as defined in claim 5, wherein a slag discharge pipe (14) is further disposed in the lump coal gasification furnace (1), and the slag discharge port (141) is located at an outlet end of the slag discharge pipe (14), so that solid particles generated by reaction in the lump coal gasification reaction chamber (11) are discharged from the slag discharge pipe (14) to the pulverized coal gasification reaction chamber (21);
the deslagging pipe (14) is located between the first distribution plate (16) and the second distribution plate (17), the inlet end of the deslagging pipe (14) is connected with the second distribution plate (17), and the outlet end of the deslagging pipe (14) is connected with the first distribution plate (16).
7. The pulverized coal and lump coal coupled gasification system as claimed in any one of claims 1 to 3, wherein the lump coal gasification furnace (1) further has a gas replenishment port (18) communicated with the lump coal gasification reaction chamber (11) for replenishing steam or carbon monoxide and hydrogen into the lump coal gasification reaction chamber (11) through the gas replenishment port (18).
8. The pulverized coal and lump coal coupled gasification system as claimed in claim 7, wherein the lump coal gasification furnace (1) further has an oxygen replenishment port communicating with the lump coal gasification reaction chamber (11) for replenishing oxygen into the lump coal gasification reaction chamber (11) through the oxygen replenishment port.
9. The coupled gasification system of pulverized coal and lump coal as claimed in any one of claims 1 to 3, wherein the lump coal gasifier (1) is a moving bed gasifier;
the pulverized coal gasification furnace (2) is a fluidized bed gasification furnace.
10. A method for performing coupled gasification of pulverized coal and lump coal by using the coupled gasification system of pulverized coal and lump coal as claimed in any one of claims 1 to 9, the method comprising:
at least introducing pulverized coal and a gasifying agent into a pulverized coal gasification reaction cavity of a pulverized coal gasification furnace so as to enable at least the pulverized coal and the gasifying agent to generate combustion and gasification reaction in the pulverized coal gasification reaction cavity;
at least introducing lump coal into a lump coal gasification reaction cavity of a lump coal gasification furnace, and introducing gas generated by reaction in the pulverized coal gasification reaction cavity into the lump coal gasification reaction cavity so as to enable at least the lump coal and the gas to generate gasification reaction in the lump coal gasification reaction cavity; gas generated by reaction in the pulverized coal gasification reaction cavity sequentially enters the lump coal gasification reaction cavity through the first distribution plate and the second distribution plate;
solid particles generated by reaction in the lump coal gasification reaction cavity are introduced into the pulverized coal gasification reaction cavity, so that at least the solid particles, the pulverized coal and the gasifying agent are subjected to combustion and gasification reaction in the pulverized coal gasification reaction cavity; and solid particles generated by reaction in the lump coal gasification reaction cavity enter the pulverized coal gasification reaction cavity through the slag discharge port.
11. The method of claim 10, wherein the introducing at least lump coal into the lump coal gasification reaction chamber of the lump coal gasification furnace comprises:
loading a catalyst on the surface of the lump coal;
and introducing the lump coal loaded with the catalyst into the lump coal gasification reaction cavity.
12. The method of claim 11, wherein after the lump coal loaded with the catalyst is passed into the lump coal gasification reaction chamber, the method further comprises:
and supplementing carbon monoxide and hydrogen into the lump coal gasification reaction cavity.
13. The method of any one of claims 10 to 12, wherein when the steam content in the gas introduced into the lump coal gasification reaction chamber is below a preset steam content threshold, the method further comprises:
and introducing steam into the lump coal gasification reaction cavity.
14. The method of claim 13, wherein when the temperature of the steam introduced into the lump coal gasification reaction chamber is lower than a preset temperature threshold, the method further comprises:
and introducing oxygen into the lump coal gasification reaction cavity.
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