CN109022006B - Production system and process of powdery coke/semi coke for grading utilization of coal powder particle size - Google Patents
Production system and process of powdery coke/semi coke for grading utilization of coal powder particle size Download PDFInfo
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Abstract
The invention discloses a system and a process for producing powdery coke/semi coke by grading and utilizing coal powder particle sizes, wherein a coal breaker, a crushed coal bin, a coal mill and a coarse coal powder separator are sequentially connected, a coarse coal powder outlet of the coarse coal powder separator is connected with a coarse coal powder bin, an outlet of the coarse coal powder bin is connected with an inlet of a coarse coal powder weighing feeder, a fine coal powder outlet of the coarse coal powder separator is connected with a fine coal powder collector, a fine coal powder outlet of the fine coal powder collector is connected with a fine coal powder bin, and an outlet of the fine coal powder bin is connected with an inlet of a fine coal powder weighing feeder; the preparation device is composed of a combustion section and a preparation section in a U shape, an outlet of the combustion section is connected with an inlet of the preparation section, an air inlet is formed in the side wall of the lower part of the inlet of the combustion section, a water and/or steam nozzle is formed in the side wall of the outlet of the combustion section, and a coarse coal powder inlet is formed in the side wall of the upper part of the inlet of the preparation section; the outlet of the fine coal powder weighing feeder is connected with the fuel inlet of the burner, the outlet of the coarse coal powder weighing feeder is connected with the coarse coal powder inlet of the preparation section, and the outlet of the preparation section is connected with the inlet of the cyclone separator.
Description
Technical Field
The invention relates to the field of coal chemical industry, in particular to a system and a process for producing powdery coke/semi coke by grading and utilizing the particle size of pulverized coal.
Background
Aiming at a powdery coke and semi-coke preparation process, the inventor provides a powdery semi-coke preparation device and a powdery semi-coke preparation process in a patent with the application number of 201711039704.X, however, in the process, natural gas is mainly used and gas obtained by purifying pyrolysis gas generated in the semi-coke preparation process is used as fuel of a combustion section, the process not only needs coal as a product raw material, but also needs natural gas as a fuel raw material, and the requirement on the type and quantity of the raw materials is high. The inventor of the application provides a staged and segmented coke breeze preparation system and a staged and segmented coke breeze preparation process in a patent with the application number of 201710671922.9, can realize the supply of fuel raw materials of an active coke preparation combustion section and the supply of product raw materials of a coke making section by only adopting one raw material through pulverized coal particle size classification, and has low requirements on the types and the number of the raw materials. Therefore, the preparation system and the preparation process of the grading sectional type are applied to the preparation of powdery coke or semi coke so as to solve the problem that the process in the patent with the application number of 201711039704.X has high requirements on the types and the quantity of raw materials.
Disclosure of Invention
In order to solve the defects of the prior art, one of the purposes of the invention is to provide a powdery coke/semi coke production system for grading and utilizing the particle size of pulverized coal, which does not need to adopt natural gas as fuel of a combustion section.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a production system of powdery coke/semi coke for grading utilization of pulverized coal particle size comprises a powder making device, a powdery coke/semi coke preparation device and a powdery coke/semi coke collecting device, wherein the powdery coke/semi coke collecting device comprises a cyclone separator;
the powder preparation device comprises a coal crusher, a crushed coal bin, a coal mill, a coarse coal powder separator, a fine coal powder collector, a coarse coal powder bin, a coarse coal powder weighing feeder, a fine coal powder bin, a fine coal powder weighing feeder, the coal crusher, the crushed coal bin, the coal mill, the coarse coal powder separator are sequentially connected, a coarse coal powder outlet of the coarse coal powder separator is connected with the coarse coal powder bin, an outlet of the coarse coal powder bin is connected with an inlet of the coarse coal powder weighing feeder, a fine coal powder outlet of the coarse coal powder separator is connected with the fine coal powder collector, a fine coal powder outlet of the fine coal powder collector is connected with the fine coal powder bin, and an outlet of the fine coal powder bin is connected with an inlet of the fine coal powder weighing feeder;
the powdery coke/semi coke preparation device is composed of a combustion section and a preparation section in a U shape, wherein an inlet and an outlet of the combustion section are respectively arranged at the top and the bottom of the combustion section, an inlet and an outlet of the preparation section are respectively arranged at the bottom and the top of the preparation section, an outlet of the combustion section is connected with an inlet of the preparation section, an inlet of the combustion section is provided with a burner, the side wall of the lower part of the inlet of the combustion section is provided with an air inlet, the side wall of the outlet of the combustion section is provided with a water and/or steam nozzle, and the side wall of the upper part of the inlet of the preparation section is provided with a coarse coal powder inlet;
the outlet of the fine coal powder weighing feeder is connected with the fuel inlet of the combustor, the outlet of the coarse coal powder weighing feeder is connected with the coarse coal powder inlet of the preparation section, and the outlet of the preparation section is connected with the inlet of the cyclone separator.
Firstly, as the powdered coke/semi coke has high requirement for ash content, the natural gas and coal gas in the patent with application number 201711039704.X are used as fuel of a combustion section, and the aim is to reduce the ash content in the product. If (fine) coal powder is used for combustion, a large amount of fly ash is generated, and the quality of the product is affected. The side wall at the outlet of the combustion section is provided with the water or steam nozzle, so that the temperature can be adjusted through water or steam, and the fly ash generated after combustion can be well removed, so that the quality of the product is ensured.
Secondly, in the patent with the application number of 201711039704.X, the split particle size is adopted to control the mass ratio of the fine coal powder and the coarse coal powder, and the split particle size can only be controlled by a coal mill and a coarse coal powder separator, but the coal mill and the coarse coal powder separator are directly utilized to split the particle size, so that the requirements on the equipment performance of the coal mill and the coarse coal powder separator are extremely high, and the mass ratio of the fine coal powder and the coarse coal powder is difficult to control, thereby influencing the stability of producing the powdery coke/semi coke by the system operation. Therefore, in order to provide the stability of producing the powdery coke/semi-coke by the system operation, the invention adds the coarse coal powder bin, the coarse coal powder weighing feeder, the fine coal powder bin and the fine coal powder weighing feeder, and the weighing feeder limits the mass ratio of the fine coal powder to the coarse coal powder, thereby not only reducing the performance requirement of the equipment, but also ensuring the stable operation of producing the powdery coke/semi-coke.
The invention also aims to provide a production process of powdery coke/semi coke by utilizing pulverized coal in a particle size grading manner, wherein the production system is provided, raw material coal enters a crushed coal bin after being primarily crushed by a coal crusher, and crushed coal in the crushed coal bin enters a coal mill to generate the crushed coalCoal powder, the coal powder is separated by a coarse coal powder separator, the coarse coal powder enters a coarse coal powder bin from a solid-phase outlet of the coarse coal powder separator, the fine coal powder is collected by a fine coal powder collector from a gas-phase outlet of the coarse coal powder separator and then enters a fine coal powder bin, the fine coal powder in the fine coal powder bin is conveyed to a combustor and is combusted in a combustion section by a fine coal powder weighing feeder, the coarse coal powder in the coarse coal powder bin is conveyed to an inlet of a preparation section by the coarse coal powder weighing feeder and is mixed with hot flue gas generated by the combustion section to move upwards, the pyrolysis reaction is completed in the preparation section within 3-10 s, the pulverized coke/semi coke is obtained by separation of a cyclone separator, the mass ratio of the fine coal powder to the coarse coal powder is 1/6-1/3, the total particle size range of the coal powder is 20-1000 mu m, and the particle size (d) is divided by the separator p ) The range is 50 to 200 μm.
The invention has the beneficial effects that:
1. the invention can realize the grading utilization of the coal powder to prepare the powdery coke/semi coke, and the weight ratio of the coarse coal powder to the fine coal powder is limited by the weighing feeder, thereby not only reducing the performance requirement of the equipment, but also ensuring the stable operation of the production of the powdery coke/semi coke.
2. According to the invention, the coarse coal powder bin and the fine coal powder bin are added, and if one coal powder is insufficient, the other coal powder can be adopted for substitution, so that the stable operation of the system and the process is further ensured.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application.
FIG. 1 is a schematic diagram of the system of the present invention;
1. a raw coal bunker; 2. a coal crusher; 3. a crushed coal bin; 4. a coal mill; 5. a coarse coal powder separator; 6. a coarse coal powder bin; 7. a coarse coal powder weighing feeder; 8. a coarse coal powder conveying pipeline; 9. a pulverized crude coal riser; 10. a fine coal powder downcomer; 11. a fine coal dust collector; 12. a fine coal dust bin; 13. a fine coal powder weighing feeder; 14. a fine coal powder delivery pipe; 15. a swirl burner; 16. an air jet; 17. a combustion section; 18. a water/steam jet; 19. an ash hopper; 20. a slag pool; 21. a slag conveyor; 22. a pulverized coal nozzle; 23. a preparation section; 24. a powdery coke/semi coke separator; 5. a powdered coke/semi coke cooler; 26. a powdery coke/blue coke bin; 27. powdered coke/semi coke; 28. a pyrolysis gas burner; 29. a combustion-supporting air nozzle; 30. an adiabatic combustion section; 31. a spiral tube type water-cooled wall; 32. a superheater; 33. a coal economizer; 34. an air preheater; 35. cooling the air; 36. a bag-type dust collector; 37. a steam turbine; 38. the steam is superheated.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure herein. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
As described in the background art, the prior art has the defect of high requirements on the number of types of raw materials in the preparation process of powdery coke or semi coke, and in order to solve the technical problems, the application provides a production system and a production process of powdery coke/semi coke, wherein the production system and the production process are used for classifying the particle size of coal powder.
The system comprises a powder making device, a powdery coke/semi-coke preparation device and a powdery coke/semi-coke collection device, wherein the powdery coke/semi-coke collection device comprises a cyclone separator;
the coal pulverizing device comprises a coal crusher, a crushed coal bin, a coal mill, a coarse coal powder separator, a fine coal powder collector, a coarse coal powder bin, a coarse coal powder weighing feeder, a fine coal powder bin and a fine coal powder weighing feeder, wherein the coal crusher, the crushed coal bin, the coal mill and the coarse coal powder separator are sequentially connected;
the powdery coke/semi-coke preparation device is composed of a combustion section and a preparation section in a U shape, wherein an inlet and an outlet of the combustion section are respectively arranged at the top and the bottom of the combustion section, an inlet and an outlet of the preparation section are respectively arranged at the bottom and the top of the preparation section, an outlet of the combustion section is connected with an inlet of the preparation section, an inlet of the combustion section is provided with a burner, an air inlet is formed in the side wall of the lower part of the inlet of the combustion section, a water and/or steam nozzle is formed in the side wall of the outlet of the combustion section, and a coarse coal powder inlet is formed in the side wall of the upper part of the inlet of the preparation section;
the outlet of the fine coal powder weighing feeder is connected with the fuel inlet of the combustor, the outlet of the coarse coal powder weighing feeder is connected with the coarse coal powder inlet of the preparation section, and the outlet of the preparation section is connected with the inlet of the cyclone separator.
Firstly, as the powdered coke/semi coke has high requirement for ash content, the natural gas and coal gas in the patent with application number 201711039704.X are used as fuel of a combustion section, and the aim is to reduce the ash content in the product. If (fine) coal powder is used for combustion, a large amount of fly ash is generated, and the quality of the product is affected. And the lateral wall at the combustion section exit is seted up water or vapor spout in this application, can enough adjust the temperature through water or vapor, can have good effect of getting rid of to the flying dust that produces after the burning moreover to the quality of product has been guaranteed.
Secondly, in the patent with the application number of 201711039704.X, the split particle size is adopted to control the mass ratio of the fine coal powder and the coarse coal powder, and the split particle size can only be controlled by a coal mill and a coarse coal powder separator, but the coal mill and the coarse coal powder separator are directly utilized to split the particle size, so that the requirements on the equipment performance of the coal mill and the coarse coal powder separator are extremely high, and the mass ratio of the fine coal powder and the coarse coal powder is difficult to control, thereby influencing the stability of producing the powdery coke/semi coke by the system operation. Therefore, in order to provide the stability of producing the powdery coke/semi coke by system operation, the coarse coal powder bin, the coarse coal powder weighing feeder, the fine coal powder bin and the fine coal powder weighing feeder are increased, the mass ratio of the fine coal powder to the coarse coal powder is limited by the weighing feeder, the performance requirement of equipment is reduced, and the stable operation of producing the powdery coke/semi coke can be ensured.
Preferably, the powder preparation device comprises a coarse coal powder ascending pipe and a fine coal powder descending pipe, wherein an inlet of the coarse coal powder ascending pipe is connected to the bottom of the coarse coal powder bin, an outlet of the coarse coal powder ascending pipe is connected to the upper portion of the fine coal powder bin, an inlet of the fine coal powder descending pipe is connected to the bottom of the fine coal powder bin, and an outlet of the fine coal powder descending pipe is connected to the upper portion of the coarse coal powder bin. If one of the pulverized coals is insufficient, the other pulverized coal can be adopted for substitution, so that the temperature operation of the system and the process is further ensured.
Preferably, the combustion section and the preparation section share one ash bucket, the outlet of the combustion section is communicated with the inlet of the preparation section through the ash bucket, the bottom of the ash bucket is provided with a slag pool, and a slag dragging machine is arranged in the slag pool.
Preferably, the powdery coke/semi-coke collecting device comprises a powdery coke/semi-coke cooler and a powdery coke/semi-coke collecting bin, and the powdery coke/semi-coke separated by the cyclone separator enters the powdery coke/semi-coke collecting bin after being cooled by the powdery coke/semi-coke cooler.
Further preferably, the device comprises a pyrolysis gas incineration waste heat utilization device, wherein the pyrolysis gas incineration waste heat utilization device comprises an incinerator, and a spiral tube type water-cooled wall, a superheater, an economizer, an air preheater and a bag-type dust remover are sequentially arranged at the bottom of the incinerator according to the flow direction of flue gas generated by the incinerator. The pyrolysis gas separated by the cyclone separator has higher temperature, is mixed with combustion-supporting air after entering the incinerator, and can be fully combusted.
It is further preferred that the air outlet of the air preheater is connected to the air inlet of the burner and the air inlet of the incinerator.
Still further preferably, the system comprises a steam turbine, a cooling water outlet of the steam turbine is respectively connected with a cooling water inlet of the powdery coke/semi-coke cooler and a cooling water inlet of the economizer, the cooling water outlet of the powdery coke/semi-coke cooler and the cooling water outlet of the economizer are simultaneously connected with a cooling water inlet of the spiral tube type water-cooled wall, the cooling water outlet of the spiral tube type water-cooled wall is connected with a cooling water inlet of the superheater, and the cooling water outlet of the superheater provides superheated steam for the steam turbine. The spiral tube type water-cooled wall heat exchange wall, the superheater, the economizer and the air preheater are conventional equipment.
The other embodiment of the application provides a production process of powdery coke/semi coke by utilizing pulverized coal in a grading manner, the production system is provided, raw material coal enters a pulverized coal bin after being primarily crushed by a coal crusher, pulverized coal in the pulverized coal bin enters a coal mill to generate pulverized coal, the pulverized coal is separated by a coarse coal separator, coarse coal enters a coarse coal bin from a solid-phase outlet of the coarse coal separator, fine coal powder enters a fine coal bin after being collected by a fine coal collector from a gas-phase outlet of the coarse coal separator, the fine coal powder in the fine coal bin is conveyed to a burner and is combusted in a combustion section, the combusted material is cooled by water or steam sprayed by a water or steam nozzle to remove fly ash, the coarse coal bin is conveyed to an inlet of a preparation section by a coarse coal weighing feeder to be mixed with the fly ash removed by cooling, then the pulverized coal is subjected to pyrolysis reaction in the preparation section, and then the pulverized coke/semi coke is obtained by separating by a cyclone separator, the mass ratio of the fine coal powder to the coarse coal is 1/6-1/3, the total particle size of the pulverized coal is in a range of 20-50 mu m, and the total particle size range of the pulverized coal is in a range of 200-50 mu m.
Preferably, the amount of air in the combustion section is controlled so that the oxygen concentration of the flue gas produced by combustion in the combustion section is not higher than 2% by volume.
Preferably, the residence time of the coarse coal powder in the preparation section is 3 to 10s.
Preferably, the temperature in the preparation stage is between 700 and 1100 ℃.
Preferably, the gas flow velocity in the preparation section is between 3 and 6m/s.
In order to make the technical solutions of the present application more clearly understood by those skilled in the art, the technical solutions of the present application will be described in detail below with reference to specific embodiments.
Example 1
The system of this embodiment, as shown in fig. 1, includes a powder making device, a powdery coke/semi coke preparation device, a powdery coke/semi coke collection device, and a pyrolysis gas incineration waste heat utilization device.
The specific process comprises the following steps: raw coal in a raw coal bin 1 is crushed by a crusher 2, enters a crushed coal bin 3 and then enters a coal mill 4 for milling, the prepared coal powder has the particle size distribution of 20-500 mu m, and an air-powder mixture at an outlet of the coal mill 4 enters a coarse coal powder separator 5 for separating the particle size (d) p ) The design range is 50-200 mu m, and the separated coarse coal powder (d) p 500 mu m) into a coarse coal powder bin 6, the coarse coal powder is sent into a coking section 23 through a weighing feeder 7 and a coarse coal powder conveying pipeline 8, and the conveying medium adopts tail flue gas or nitrogen of an incinerator; the exhaust gas at the outlet of the coarse coal powder separator 5 enters a cloth bag collector 11, and the collected fine coal powder (20 mu m-d) p ) Entering a fine coal powder bin 12, sending the exhaust gas at an outlet into a bag-type dust remover 36 for deep dust removal, sending the fine coal powder into a combustion section 17 from a cyclone burner 15 through a weighing feeder 13 and a fine powder conveying pipeline 14, wherein the conveying medium is hot air preheated by an incinerator air preheater; according to the process requirements, the proportion of coarse coal powder and fine coal powder needs to be controlled for a coal preparation system so as to ensure the stable and continuous operation of the system, in the embodiment, taking lignite is taken as an example, the mass ratio of the coarse coal powder to the fine coal powder to be consumed is controlled to be 1.
The pulverized coal is utilized in a grading way, the fine pulverized coal is fully combusted, the particle size of fly ash particles in the combusted flue gas is finer, the combusted flue gas enters the preparation section 23 and is mixed with coarse pulverized coal to finish the preparation process, the fly ash generated in the combustion section can be mixed in a gas-solid mixture in the preparation section, therefore, the particle size of the pulverized coke/semi-coke separator 24 is equal to that of the coarse pulverized coal separator 5, after separation, the fine fly ash generated in the combustion section and products with smaller particle size generated in the preparation section enter a pyrolysis gas incinerator to be combusted, combustion-supporting air comes from an air preheater 34, the air temperature is about 300 ℃, the thermal-insulation combustion section 30 is subjected to thermal oxidation combustion to maintain the combustion temperature at about 1100 ℃, meanwhile, tar molecules in the pyrolysis gas, unseparated fine coke/semi-coke particles and other combustible substances can be completely combusted at the high temperature of 1100 ℃, the combustion-supporting air enters the spiral heat exchange tube type heat exchange section 31, then sequentially passes through a heat exchanger 32, a coal economizer 33 and the air preheater 34 to finish heat exchange, and finally the burnt flue gas is cooled to the temperature of about 180 ℃ and is introduced into a bag dust collector 36 and a subsequent flue gas purification device. The separated solid phase product enters a powdery coke/semi coke cooler 25, the powdery coke/semi coke is cooled to about 80 ℃ from 700-1100 ℃, and then enters a powdery coke collecting bin 26, cooling water is heated to about 300 ℃ from 25 ℃, and then enters a spiral tube type water-cooled wall 31.
The coarse coal powder bin 6 is communicated with the fine coal powder bin 12 through a coarse coal powder pipeline 9 and a fine coal powder pipeline 10; the design aims to ensure that when the proportion of the coarse coal powder and the fine coal powder has deviation, as an emergency adjusting measure, the balance adjustment between the coarse coal powder and the fine coal powder can be realized, so as to ensure the stable operation of the system.
The cold air 35 is heated by the air preheater 34 and then divided into two paths, one path is connected with the cyclone burner 15 to be used as secondary air, and the other path is connected with the combustion-supporting air nozzle 29 to be used as combustion-supporting air for burning the pyrolysis gas.
The condensed water is divided into two paths, one path is preheated by an economizer 33, the other path is preheated by a powdery coke/semi coke cooler 25, the powdery coke/semi coke cooler 25 is used as a partial economizer to further absorb the waste heat in the powdery coke/semi coke, the two paths are mixed and enter a spiral pipe type water-cooled wall 31, the mixture enters a superheater 32 after absorbing heat, superheated steam 38 is introduced into a steam turbine 33 to do work, the low-quality steam after doing work can be used for industrial production or civil heating, and finally the low-quality steam is condensed and recycled by a condenser.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (7)
1. A production process of powdery coke/semi coke by utilizing pulverized coal in a grading manner is characterized in that a production system is provided, raw material coal enters a pulverized coal bin after being primarily crushed by a coal crusher, pulverized coal is generated after the pulverized coal in the pulverized coal bin enters a coal mill, pulverized coal is separated by a coarse pulverized coal separator, coarse pulverized coal enters a coarse pulverized coal bin from a solid-phase outlet of a coarse pulverized coal separator, fine pulverized coal enters a fine pulverized coal bin after being collected by a fine coal collector from a gas-phase outlet of the coarse pulverized coal separator, a fine pulverized coal weighing feeder conveys the fine pulverized coal in the fine pulverized coal bin to a burner and burns in a combustion section, the burnt material is subjected to temperature reduction and fly ash removal by water and/or steam nozzle water injection and/or steam, the coarse pulverized coal weighing feeder conveys the coarse pulverized coal in the coarse pulverized coal bin to an inlet of a preparation section to be mixed with the material subjected to temperature reduction and fly ash removal, then a pyrolysis reaction is carried out in the preparation section, powdery coke/semi coke is obtained after separation by a cyclone separator, and the mass ratio of the fine coal to the coarse pulverized coal is 1/6-1/3;
the production system comprises a powder making device, a powdery coke/semi-coke preparation device and a powdery coke/semi-coke collection device, wherein the powdery coke/semi-coke collection device comprises a cyclone separator;
the coal pulverizing device comprises a coal crusher, a crushed coal bin, a coal mill, a coarse coal powder separator, a fine coal powder collector, a coarse coal powder bin, a coarse coal powder weighing feeder, a fine coal powder bin and a fine coal powder weighing feeder, wherein the coal crusher, the crushed coal bin, the coal mill and the coarse coal powder separator are sequentially connected;
the powdery coke/semi-coke preparation device is composed of a combustion section and a preparation section in a U shape, wherein an inlet and an outlet of the combustion section are respectively arranged at the top and the bottom of the combustion section, an inlet and an outlet of the preparation section are respectively arranged at the bottom and the top of the preparation section, an outlet of the combustion section is connected with an inlet of the preparation section, an inlet of the combustion section is provided with a burner, an air inlet is formed in the side wall of the lower part of the inlet of the combustion section, a water and/or steam nozzle is formed in the side wall of the outlet of the combustion section, and a coarse coal powder inlet is formed in the side wall of the upper part of the inlet of the preparation section;
the outlet of the fine coal powder weighing feeder is connected with the fuel inlet of the combustor, the outlet of the coarse coal powder weighing feeder is connected with the coarse coal powder inlet of the preparation section, and the outlet of the preparation section is connected with the inlet of the cyclone separator;
the powder making device comprises a coarse coal powder ascending pipe and a fine coal powder descending pipe, wherein the inlet of the coarse coal powder ascending pipe is connected to the bottom of the coarse coal powder bin, the outlet of the coarse coal powder ascending pipe is connected to the upper part of the fine coal powder bin, the inlet of the fine coal powder descending pipe is connected to the bottom of the fine coal powder bin, and the outlet of the fine coal powder descending pipe is connected to the upper part of the coarse coal powder bin;
the combustion section and the preparation section share one ash bucket, the outlet of the combustion section is communicated with the inlet of the preparation section through the ash bucket, a slag pool is arranged at the bottom of the ash bucket, and a slag conveyor is arranged in the slag pool.
2. The process according to claim 1, wherein the powdery coke/semi-coke collecting means comprises a powdery coke/semi-coke cooler and a powdery coke/semi-coke collecting chamber, and the powdery coke/semi-coke separated by the cyclone separator is cooled by the powdery coke/semi-coke cooler and then enters the powdery coke/semi-coke collecting chamber.
3. The production process according to claim 2, wherein the pyrolysis gas incineration waste heat utilization device comprises an incinerator, a spiral tube type water-cooled wall, a superheater, an economizer, an air preheater and a bag-type dust remover are sequentially arranged at the bottom of the incinerator according to the flow direction of flue gas generated by the incinerator, the pyrolysis gas separated by a cyclone separator is high in temperature, and is mixed with combustion-supporting air after entering the incinerator, so that the pyrolysis gas can be fully combusted.
4. A process according to claim 3, wherein the air outlet of the air preheater is connected to the air inlet of the burner and the air inlet of the incinerator.
5. The production process as claimed in claim 3, which includes a steam turbine, the cooling water outlet of the steam turbine is connected to the cooling water inlet of the pulverized coke/semi coke cooler and the cooling water inlet of the economizer respectively, the cooling water outlet of the pulverized coke/semi coke cooler and the cooling water outlet of the economizer are connected to the cooling water inlet of the spiral tube type water-cooled wall at the same time, the cooling water outlet of the spiral tube type water-cooled wall is connected to the cooling water inlet of the superheater, and the cooling water outlet of the superheater provides superheated steam for the steam turbine.
6. The process of claim 1 wherein the amount of air in the combustion zone is controlled so that the flue gas produced by the combustion in the combustion zone has an oxygen concentration of no more than 2% by volume.
7. The process according to claim 1, wherein the coarse coal powder has a residence time of 3 to 10 seconds in the preparation section and a temperature of 700 to 1100 ℃ in the preparation section.
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| CN201810797383.8A CN109022006B (en) | 2018-07-19 | 2018-07-19 | Production system and process of powdery coke/semi coke for grading utilization of coal powder particle size |
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| CN201810797383.8A CN109022006B (en) | 2018-07-19 | 2018-07-19 | Production system and process of powdery coke/semi coke for grading utilization of coal powder particle size |
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| CN109022006B true CN109022006B (en) | 2022-10-18 |
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| CN115303821A (en) * | 2022-07-05 | 2022-11-08 | 宁夏金海东泰洁能有限公司 | Semi coke end forming treatment system |
| CN115584285B (en) * | 2022-12-05 | 2023-04-11 | 浙江百能科技有限公司 | Pyrolysis gasification system and process based on cyclone furnace |
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