CN110938474B - Method for loading papermaking black liquor on coal sample, fluidized bed furnace and system - Google Patents
Method for loading papermaking black liquor on coal sample, fluidized bed furnace and system Download PDFInfo
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- CN110938474B CN110938474B CN201911304707.0A CN201911304707A CN110938474B CN 110938474 B CN110938474 B CN 110938474B CN 201911304707 A CN201911304707 A CN 201911304707A CN 110938474 B CN110938474 B CN 110938474B
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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
- C10J3/54—Gasification of granular or pulverulent fuels by the Winkler technique, i.e. by fluidisation
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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
- C10J2300/0983—Additives
- C10J2300/0986—Catalysts
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Abstract
The invention provides a method for loading papermaking black liquor on a coal sample, a fluidized bed furnace and a system. The method comprises the following steps which are sequentially executed according to the following sequence: s1, providing a fluidized bed furnace, a coal sample pre-loaded with papermaking black liquor and papermaking black liquor; s2, conveying the coal sample into the fluidized bed furnace, and introducing fluidizing gas to enable the coal sample to be in a fluidized state; and S3, spraying the papermaking black liquor into the fluidized bed furnace to mix with the coal sample, and completing the loading of the coal sample papermaking black liquor after the mixing time reaches the preset time. The black paper making liquid is loaded on the coal sample in the fluidized bed furnace, and the coal sample is in a fluidized state in the fluidized bed furnace, so that the coal powder particles continuously roll and move, the black paper making liquid is sprayed in the process, the uniform distribution of the black paper making liquid is facilitated, the coal powder particles are not easy to agglomerate under the action of the fluidizing gas, and the efficiency and the quality of loading the black paper making liquid on the coal sample are improved.
Description
Technical Field
The invention relates to the field of coal gasification, in particular to a method for loading papermaking black liquor by a coal sample, a fluidized bed furnace and a system.
Background
The papermaking black liquor discharged from the alkaline pulping contains a large amount of alkali metal components such as sodium carbonate, sodium hydroxide, sodium sulfide, sodium sulfate, potassium salt and the like, and the alkali metal sodium salt and the alkali metal potassium salt can effectively catalyze the coal gasification reaction. In addition, organic matters such as lignin and hemicellulose in the black liquor have a certain promotion effect on gasification, and meanwhile, the organic matters are used as carbon sources to participate in the gasification, so that the coal gasification yield is improved. Therefore, the method for preparing methane by utilizing the alkaline papermaking black liquor to catalyze coal gasification has important social and economic values, not only provides an efficient and cheap catalyst for coal catalytic gasification, but also solves the problems of serious pollution and high alkali recovery cost of the papermaking black liquor, and realizes the energy utilization of the papermaking black liquor.
Although the application of the papermaking black liquor to coal gasification catalysis has great advantages. However, in the process of loading the black paper-making liquid by the conventional impregnation method, the viscosity is increased due to a large amount of organic matters and silicon contained in the black paper-making liquid, and even under the premise of enhancing stirring, the black paper-making liquid and the coal sample cannot be uniformly mixed. In the subsequent drying process, along with the volatilization of moisture, coal particles are bonded, and the dried material forms hard blocks which are very difficult to break. Therefore, the material must be stirred while drying to prevent agglomeration between particles. The physical properties of the black liquor in paper making bring certain difficulties to the load drying operation.
The development of the application of the papermaking black liquor in the coal catalytic gasification technology is limited due to the bottleneck of loading/drying of the papermaking black liquor.
Disclosure of Invention
The invention aims to provide a method, a fluidized bed furnace and a system for loading black paper making liquor by a coal sample, so as to solve the problem that caking is easy to occur in the process of loading the black paper making liquor by the coal sample.
In order to achieve the above object, the present invention firstly provides a method for loading black liquor in paper making by coal sample, which comprises the following steps performed in sequence:
s1, providing a fluidized bed furnace, a coal sample pre-loaded with papermaking black liquor and papermaking black liquor;
s2, conveying the coal sample into the fluidized bed furnace, and introducing fluidizing gas to enable the coal sample to be in a fluidized state;
and S3, spraying the papermaking black liquor into the fluidized bed furnace to mix with the coal sample, and completing the loading of the coal sample papermaking black liquor after the mixing time reaches the preset time.
Optionally, in S3, the black paper making liquor is injected into the fluidized bed furnace at a predetermined shear rate, so that the macromolecular organic matter in the black paper making liquor is broken due to mechanical compression and distortion.
Optionally, the predetermined shear rate is ≧ 104s-1。
Optionally, the fluidization gas is preheated prior to passing into the fluidized bed furnace.
Optionally, the temperature of the fluidizing gas introduced into the fluidized bed furnace is 200-300 ℃, and the internal pressure of the fluidized bed furnace in the working process is greater than the atmospheric pressure.
Optionally, the predetermined time is 1-2 hours.
Optionally, a step S0 is further included before the step S1,
the S0 includes: carrying out desiliconization treatment on the papermaking black liquor;
the S1 includes: provides a fluidized bed furnace, a coal sample of pre-loaded papermaking black liquor and the papermaking black liquor after desilication treatment.
Optionally, the desiliconization treatment method is as follows: introducing carbon dioxide into the papermaking black liquor to precipitate silicon in the papermaking black liquor, and then discharging the precipitated silicon.
The invention provides a fluidized bed furnace for the method for loading the papermaking black liquor by the coal sample, which comprises a furnace body, wherein the furnace body is provided with a coal sample inlet, a discharge outlet, an air inlet and an exhaust outlet; the bottom in the furnace body is provided with a gas distribution structure, and the gas inlet is communicated with the gas distribution structure; and a plurality of black paper making liquid nozzles are arranged on the side wall of the furnace body and used for spraying black paper making liquid into the furnace body.
Optionally, a plurality of black liquor making nozzles are arranged on the side wall of the furnace body in an up-down layered manner, the black liquor making nozzles arranged on each layer are uniformly distributed, and the black liquor making nozzles on adjacent layers are staggered.
The invention further provides a system for loading the black liquor in the paper making process by the coal sample, which comprises the following steps: the device comprises a preheating device, a feeding device, a papermaking black liquor conveying device and the fluidized bed furnace provided by the invention;
the air inlet and the air outlet are communicated with the preheating device, so that the preheating device can circularly and continuously convey preheated fluidized gas into the furnace body;
the feeding device is communicated with the coal sample inlet so as to convey the coal sample into the furnace body;
the papermaking black liquor conveying device is communicated with the plurality of papermaking black liquor nozzles so as to spray the papermaking black liquor into the furnace body through the plurality of papermaking black liquor nozzles.
The black paper making liquid is loaded on the coal sample in the fluidized bed furnace, and the coal sample is in a fluidized state in the fluidized bed furnace, so that the coal powder particles continuously roll and move, the black paper making liquid is sprayed in the process, the uniform distribution of the black paper making liquid is facilitated, the coal powder particles are not easy to agglomerate under the action of the fluidizing gas, and the efficiency and the quality of loading the black paper making liquid on the coal sample are improved.
Drawings
FIG. 1 is a schematic flow chart of a method for loading black liquor on a coal sample according to an embodiment of the invention;
FIG. 2 is a schematic flow chart of a method for loading black liquor on a coal sample according to another embodiment of the present invention;
fig. 3 is a schematic diagram of the application of the system for loading black paper making liquor on a coal sample in one embodiment of the invention.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, the present invention will be further described in detail with reference to the accompanying drawings and examples. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. The specific embodiments described herein are merely illustrative of the invention and are not to be construed as limiting the invention. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention, are within the scope of the invention.
The core idea of the invention is to reduce the problem of caking of the coal sample in the process of loading the black paper making liquid by reducing the viscosity of the black paper making liquid, and to improve the uniformity of the black paper making liquid loaded by the coal sample by increasing the activity degree of the coal sample, thereby reducing the problem of technicians in the field in the process of loading the black paper making liquid on the coal sample.
Referring to fig. 1, the present embodiment provides a method for loading black paper making liquor on a coal sample, which includes the following steps performed in sequence:
s1, providing a fluidized bed furnace, a coal sample pre-loaded with papermaking black liquor and papermaking black liquor;
s2, conveying the coal sample into the fluidized bed furnace, and introducing fluidizing gas to enable the coal sample to be in a fluidized state;
s3, spraying the papermaking black liquor into the fluidized bed furnace to mix with the coal sample, completing the loading of the coal sample papermaking black liquor after the mixing time reaches the preset time, and discharging the coal sample loaded with the papermaking black liquor from the fluidized bed furnace.
The "predetermined time" can be determined according to the amount of the introduced coal sample, and the larger the amount of the coal sample is, the longer the predetermined time is, and in the present embodiment, the predetermined time is in the range of 1 to 2 hours. The fluidized bed furnace adopts a pneumatic control and moving bed discharging mode, the retention time of the coal sample in the furnace is controlled to be 1-2 hours, and the coal sample is discharged from the bottom of the fluidized bed furnace after loading papermaking black liquor. In the present embodiment, the mass ratio of the black paper-making liquid to the coal sample is 0.3 to 1.5.
The method loads the black paper making liquid on the coal sample in the fluidized bed furnace, and the coal sample is in a fluidized state in the fluidized bed furnace, so that the coal powder particles continuously roll and move, the black paper making liquid is sprayed in the process, the uniform distribution of the black paper making liquid is facilitated, the coal powder particles are not easy to agglomerate under the action of the fluidizing gas, and the efficiency and the quality of loading the black paper making liquid on the coal sample are improved.
In S3, the black paper-making liquor is sprayed into the fluidized bed furnace at a preset shearing speed, so that the macromolecular organic matters in the black paper-making liquor are broken due to mechanical extrusion and distortion, thereby achieving the purpose of reducing the viscosity of the black paper-making liquor.
In the present embodiment, the predetermined shear rate is 10 or more4s-1The shear rate can be achieved by a combination of the pump body and the spray head, and the pump body and the spray head are not specifically described, and those skilled in the art can select the pump body and the spray head to achieve the injection with the predetermined shear rate on the premise of knowing the speed requirement.
Because the coal sample and the black liquor contain moisture, the fluidizing gas is preheated before being introduced into the fluidized bed furnace in order to achieve drying. The preheated fluidized gas can accelerate the evaporation of water in the fluidized bed furnace, and part of water is taken out from the fluidized bed furnace, so that the aim of drying the coal sample is achieved.
Because the coal sample loaded with the papermaking black liquor has low moisture content, the coal sample is not easy to agglomerate and can be smoothly conveyed, the coal sample is directly conveyed into the coal catalytic gasification reaction furnace for reaction, and the coal sample loaded with the papermaking black liquor can be directly fed into the gasification furnace for reaction without being dried due to low moisture content, and the method can be specifically referred to fig. 3.
In this embodiment, the temperature of the fluidizing gas introduced into the fluidized bed furnace is in the range of 200 ℃ to 300 ℃, for example: 220 ℃, 240 ℃, 260 ℃ and the like. The internal pressure of the fluidized bed furnace in the working process is greater than the atmospheric pressure, the pressure is micro-positive pressure, and the coal sample and the papermaking black liquor can be more fully subjected to fusion load in the environment of positive pressure. Specifically, the temperature to be heated has a certain relationship with the predetermined time of the load in the foregoing, and for the purpose of drying, the predetermined time may be appropriately decreased if the heating temperature is higher, and the predetermined time may be appropriately increased if the heating temperature is lower.
In order to further reduce the agglomeration of the coal dust particles, the papermaking black liquor used can be subjected to desilication treatment. Specifically, referring to fig. 2, before S1, the method further includes step S0: carrying out desiliconization treatment on the papermaking black liquor; s1 includes: provides a fluidized bed furnace, a coal sample of pre-loaded papermaking black liquor and the papermaking black liquor after desilication treatment. The viscosity of the papermaking black liquor after desiliconization is greatly reduced, the caking probability of a coal sample is reduced, and the silicon does not act on the coal gasification reaction, so that the coal gasification yield is not influenced.
There are many ways of desiliconizing the black liquor in paper making, and the embodiment provides a convenient desiliconizing method, namely: introducing carbon dioxide into the papermaking black liquor to precipitate silicon in the papermaking black liquor, and then discharging the precipitated silicon. The desiliconization method has the advantages of low cost, simple operation and easy implementation.
In the present embodiment, the fluidizing gas used may be hot water vapor, hot air, hot flue gas, pure nitrogen, carbon dioxide, oxygen-containing atmosphere, etc., and the oxygen-containing atmosphere or hot air may have partial pre-oxidation function on the coal sample, but does not affect the loading effect.
The embodiment further provides a fluidized bed furnace for the method for loading the black paper making liquid by the coal sample in the embodiment, and the fluidized bed furnace comprises a furnace body, wherein the furnace body is provided with a coal sample inlet, a discharge outlet, an air inlet and an exhaust outlet; the bottom in the furnace body is provided with a gas distribution structure, and a gas inlet is communicated with the gas distribution structure; the side wall of the furnace body is provided with a plurality of black paper making liquid nozzles for spraying black paper making liquid into the furnace body.
Preferably, a plurality of black liquor making nozzles are arranged on the side wall of the furnace body in an up-down layered mode, the black liquor making nozzles arranged on each layer are uniformly distributed, and the black liquor making nozzles on adjacent layers are staggered. The arrangement mode is favorable for the uniform distribution of the black liquor in the furnace body.
Referring to fig. 3, the present embodiment also provides a system for loading black paper making liquor on a coal sample, including: a preheating device, a feeding device, a papermaking black liquor conveying device and the fluidized bed furnace provided by the embodiment; the air inlet and the air outlet are communicated with the preheating device, so that the preheating device can circularly and continuously convey preheated fluidized gas into the furnace body; the feeding device is communicated with the coal sample inlet so as to convey the coal sample into the furnace body; the black paper making liquid conveying device is communicated with the plurality of black paper making liquid nozzles so as to spray the black paper making liquid into the furnace body through the plurality of black paper making liquid nozzles.
The system can firstly carry out carbon dioxide desilication treatment on the papermaking black liquor so as to reduce the viscosity of the papermaking black liquor, then further reduce the viscosity in a high-speed shearing jetting mode, realize the effective load of the papermaking black liquor on a coal sample, carry out synchronous drying treatment, and effectively prevent the problem that the process operation is influenced by the agglomeration of the coal sample.
The following 2 examples are provided to explain in detail the viscosity reduction treatment of the papermaking black liquor provided by the examples of the present invention, and the fluidized bed type loading is adopted, so that the effective uniform loading of the papermaking black liquor can be realized, and the coal sample can be prevented from caking.
Example 1
The desilication treatment process adopted before loading the papermaking black liquor is as follows:
measuring 1L of papermaking black liquor, placing the papermaking black liquor in an open container, introducing a carbon dioxide pipeline, and additionally arranging a porous spray head at the outlet of the pipeline to realize uniform gas distribution. The volume flow of the carbon dioxide is controlled to be 60mL/min, the aeration time is kept for 30min, and the carbon dioxide can be introduced while stirring. And (3) after the air washing is finished, standing for 30min to ensure that the generated silica gel precipitate is effectively deposited, and separating the desiliconized black liquor by adopting a filtering device to serve as a catalyst raw material for loading a coal sample.
Spraying the desiliconized black paper making liquid into a fluidized bed furnace in an atomizing mode through a spray head (the shearing speed of the black paper making liquid is 10)2S-1～5.0×102S-1) Keeping the papermaking black liquid in a fluidized bed furnace for a preset time, carrying out papermaking black liquid loading on the coal sample in a fluidized state, and measuring the particle size distribution of the coal sample loaded with the papermaking black liquid by adopting a screening method after the coal sample loaded with the papermaking black liquid is dried.
Example 2
After desilication treatment of the papermaking black liquor, spraying the papermaking black liquor into a fluidized bed in a high-speed shearing mode to further reduce the viscosity, and then carrying out papermaking black liquor loading, wherein the main process is as follows:
the procedure of example 1 was followed, and the desiliconized black liquor was sprayed into the fluidized bed furnace through the black liquor nozzle in a high shear manner at a shear rate of 5.0X 104S-1The papermaking black liquid is kept in the fluidized bed furnace for the same time as in example 1, the papermaking black liquid is loaded on the coal sample in the fluidized state, and the particle size distribution of the coal sample is determined by adopting a screening method after the coal sample loaded with the papermaking black liquid is dried.
Example 3
The contrast treatment process of carrying out load drying by adopting a fluidized bed without carrying out desiliconization treatment on the papermaking black liquor is as follows:
spraying the papermaking black liquor which is not subjected to desiliconization into a fluidized bed furnace in an atomizing mode through a spray head (the shearing speed of the papermaking black liquor is 10)2S-1～5.0×102S-1) The retention time was maintained as in examples 1 and 2, and after drying, the particle size distribution of the coal sample was measured by a sieving method.
The particle size distribution of each example is shown in table 1.1.
TABLE 1.1
According to the particle size measurement results of the embodiments, when the papermaking black liquid without desiliconization is used for loading a coal sample in an atomized form in a fluidized bed furnace, the coal sample can be agglomerated and the particle size of the coal sample is increased, the coal sample can be reduced by loading after the silicon in the papermaking black liquid is removed, the papermaking black liquid is subjected to desiliconization and is subjected to load drying in a fluidized bed in a high-speed shearing form, and although the coal sample is subjected to certain mechanical crushing impact, the uniform loading of the papermaking black liquid can be guaranteed on the whole, and the coal sample can be effectively prevented from being agglomerated.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. The method for loading black papermaking liquor on a coal sample is characterized by comprising the following steps of:
s1, providing a fluidized bed furnace, a coal sample pre-loaded with papermaking black liquor and papermaking black liquor;
s2, conveying the coal sample into the fluidized bed furnace, and introducing fluidizing gas to enable the coal sample to be in a fluidized state;
s3, spraying the papermaking black liquor into the fluidized bed furnace to mix with the coal sample, and completing the loading of the coal sample papermaking black liquor after the mixing time reaches the preset time;
said fluidization gas is preheated prior to introduction into said fluidized bed furnace;
the internal pressure of the fluidized bed furnace is greater than the atmospheric pressure during the working process.
2. The method of claim 1, wherein in S3, the black papermaking liquor is injected into the fluidized bed furnace at a predetermined shear rate, so that the high molecular weight organic substances in the black papermaking liquor are broken due to mechanical squeezing and twisting.
3. The method for loading black papermaking liquor on coal sample according to claim 2, characterized in that the predetermined shear rate is not less than 104s-1。
4. The method for loading black liquor in papermaking as claimed in claim 1, wherein the temperature range of the fluidizing gas introduced into the fluidized bed furnace is 200-300 ℃.
5. The method for loading black papermaking liquor on a coal sample according to claim 1, characterized in that the predetermined time is 1-2 hours.
6. The method for loading black papermaking liquor with coal sample according to claim 1, characterized by further comprising a step S0 before the step S1,
the S0 includes: carrying out desiliconization treatment on the papermaking black liquor;
the S1 includes: provides a fluidized bed furnace, a coal sample of pre-loaded papermaking black liquor and the papermaking black liquor after desilication treatment.
7. The method for loading black papermaking liquor on a coal sample according to claim 6, characterized in that the desilication treatment method comprises the following steps: introducing carbon dioxide into the papermaking black liquor to precipitate silicon in the papermaking black liquor, and then discharging the precipitated silicon.
8. A fluidized bed furnace for the method for loading the black papermaking liquor by the coal sample as claimed in any one of claims 1 to 7, which is characterized by comprising a furnace body, wherein the furnace body is provided with a coal sample inlet, a discharge outlet, an air inlet and an air outlet;
the bottom in the furnace body is provided with a gas distribution structure, and the gas inlet is communicated with the gas distribution structure;
and a plurality of black paper making liquid nozzles are arranged on the side wall of the furnace body and used for spraying black paper making liquid into the furnace body.
9. The fluidized bed furnace of claim 8, wherein a plurality of black liquor making nozzles are arranged in layers up and down on the side wall of the furnace body, the black liquor making nozzles arranged in each layer are uniformly distributed, and the black liquor making nozzles in adjacent layers are staggered.
10. A system for loading black liquor in papermaking by coal sample is characterized by comprising: preheating means, feeding means, black liquor conveying means and a fluidized bed furnace according to claim 8 or 9;
the air inlet and the air outlet are communicated with the preheating device, so that the preheating device can circularly and continuously convey preheated fluidized gas into the furnace body;
the feeding device is communicated with the coal sample inlet so as to convey the coal sample into the furnace body;
the papermaking black liquor conveying device is communicated with the plurality of papermaking black liquor nozzles so as to spray the papermaking black liquor into the furnace body through the plurality of papermaking black liquor nozzles.
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