CN111237745A - Non-uniform air distribution fluidized bed and non-uniform air distribution fluidized bed boiling decomposition device - Google Patents
Non-uniform air distribution fluidized bed and non-uniform air distribution fluidized bed boiling decomposition device Download PDFInfo
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- CN111237745A CN111237745A CN202010033260.4A CN202010033260A CN111237745A CN 111237745 A CN111237745 A CN 111237745A CN 202010033260 A CN202010033260 A CN 202010033260A CN 111237745 A CN111237745 A CN 111237745A
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- air
- air distribution
- distribution plate
- tuber pipe
- fluidized bed
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C10/00—Fluidised bed combustion apparatus
- F23C10/02—Fluidised bed combustion apparatus with means specially adapted for achieving or promoting a circulating movement of particles within the bed or for a recirculation of particles entrained from the bed
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C10/00—Fluidised bed combustion apparatus
- F23C10/18—Details; Accessories
- F23C10/20—Inlets for fluidisation air, e.g. grids; Bottoms
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluidized-Bed Combustion And Resonant Combustion (AREA)
Abstract
A fluidized bed boiling decomposition device with non-uniform air distribution comprises a decomposition furnace outer shell, a waste gas discharge pipeline, a tertiary air inlet pipeline, a raw material blanking pipe, a coal burning pipeline, an air chamber, a high-pressure fan inlet pipeline communicated with the air chamber, and an air distribution plate arranged at the top of the air chamber, wherein air caps are densely arranged in the central area of the air distribution plate, the air caps are sparsely arranged in the edge area of the air distribution plate, and a slag discharge port is arranged in the edge area of the air distribution plate; the blast cap is including being used for installing the blast cap on the grid plate and with the tuber pipe of air chamber intercommunication, cup joint the second tuber pipe in the tuber pipe, second tuber pipe protrusion is equipped with a plurality of nozzles, tip in the neck of tuber pipe along circumference and is the turn-ups that seals the form and be equipped with the aforementioned nozzle that is used for the shroud. Compared with the existing uniform air distribution boiling decomposing furnace, the invention has the advantages of high fuel combustion efficiency, reduced high pressure fan consumption by 20%, and reduced fluidized bed resistance.
Description
Technical Field
The invention belongs to the technical field of a boiling decomposition furnace, and particularly relates to a non-uniform air distribution fluidized bed and a boiling decomposition device adopting the non-uniform air distribution fluidized bed.
Background
The fluidized bed type decomposing furnaces used in the prior art cement production line all employ a uniformly air-distributed fluidized bed, such as the MFC type decomposing furnace in japan. The main structure of the decomposing furnace consists of an air chamber, a blast cap, a fuel nozzle, a tertiary air inlet pipeline, a raw material feeding device, a waste gas outlet pipeline and a decomposing furnace shell, the main working principle is that air is blown into the air chamber of the decomposing furnace through a high-pressure fan (the wind pressure is 10-13-18 KPa), and then the air enters the furnace through the blast cap, so that the fuel and the raw material entering from the fuel nozzle and a raw material inlet form a boiling layer, and the combustion is carried out in the boiling layer while the heat transfer decomposition is carried out.
The combustion mode is a dynamic combustion mode between the laminar combustion and the suspension combustion, when the flow velocity of the blowing air exceeds the minimum limit that the solid fuel particles can stay on the fluidized bed, some fuel particles lose stability and start to locally fluctuate in the air flow to form a boiling combustion state, and the air velocity passing through the solid fuel layer on the fluidized bed is an essential factor determining the boiling combustion effect. If the flow rate is too low, the boiling state of the fuel particles can not be formed, or the amount of the particles participating in the boiling state is less, the duration is not long, and the particles return to the fluidized bed quickly due to self weight, so that the uniform air distribution fluidized bed needs too high air pressure, usually 10 to 13 to 18KPa, but too much cold air blown by a high-pressure fan enters the decomposing furnace, so that the power consumption and heat consumption of the system are increased.
The materials entering the fluidized bed in the cement production are multi-component materials (fire coal and raw meal), the fluidized bed adopting uniform air distribution usually encounters the phenomenon that small-particle materials start to fluidize but large-particle materials are not yet fluidized, the fluidizing air speed is continuously increased to fluidize the large-particle materials, but the problem that the small particles are raised to cause incomplete reaction and are carried away from the fluidized bed is caused.
Disclosure of Invention
In view of the above technical problems, the present invention aims to provide a fluidized bed boiling decomposition device with non-uniform air distribution.
The purpose of the invention is realized by adopting the following technical scheme. According to the invention, the non-uniform air distribution fluidized bed comprises an air distribution plate, wherein air hoods are densely arranged in the central area of the air distribution plate, the air hoods are sparsely arranged in the edge area of the air distribution plate, and a slag discharge port is arranged in the edge area of the air distribution plate; the blast cap includes the tuber pipe that is used for installing the blast cap on the grid plate, cup joints the second tuber pipe in the tuber pipe, and second tuber pipe protrusion is equipped with a plurality of nozzles along circumference in the neck of tuber pipe, tip and is the turn-ups that seals the form and be equipped with the aforementioned nozzle that is used for the shroud.
Further, the arrangement number of the blast caps in the central area of the air distribution plate is 26-35/m2The arrangement number of the blast caps in the edge area of the air distribution plate is 13-18/m2。
The purpose of the invention is realized by adopting the following technical scheme. The invention provides a fluidized bed boiling decomposition device with non-uniform air distribution, which comprises a decomposition furnace outer shell, a waste gas discharge pipeline arranged at the upper end of the decomposition furnace outer shell, a tertiary air inlet pipeline, a raw material discharging pipe and a coal burning pipeline arranged at the lower part of the decomposition furnace outer shell, an air chamber arranged at the lower end of the decomposition furnace outer shell, a high-pressure fan air inlet pipeline communicated with the air chamber for allowing air to enter the decomposition furnace outer shell, and an air distribution plate arranged at the top of the air chamber; the blast caps are densely arranged in the central area of the air distribution plate, the blast caps are sparsely arranged in the edge area of the air distribution plate, and the slag discharge port is arranged in the edge area of the air distribution plate; the blast cap is including being used for installing the blast cap on the grid plate and with the tuber pipe of air chamber intercommunication, cup joint the second tuber pipe in the tuber pipe, second tuber pipe protrusion is equipped with a plurality of nozzles, tip in the neck of tuber pipe along circumference and is the turn-ups that seals the form and be equipped with the aforementioned nozzle that is used for the shroud.
Further, the arrangement number of the blast caps in the central area of the air distribution plate is 26-35/m2The arrangement number of the blast caps in the edge area of the air distribution plate is 13-18/m2。
Compared with the existing uniform air distribution boiling decomposing furnace for the cement production line, the invention has the following advantages:
1. the combustion efficiency is high;
2. the air volume for the high-pressure fan is small, and can be reduced by 20 percent compared with the existing uniform air distribution boiling decomposing furnace;
3. the aeration resistance of the fluidized bed is reduced.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, the present invention may be implemented in accordance with the content of the description, and in order to make the above and other objects, features, and advantages of the present invention more clearly understood, the following preferred embodiments are described in detail with reference to the accompanying drawings.
Drawings
FIGS. 1A to 1B are schematic views of an embodiment of a fluidized bed boiling decomposition device with non-uniform air distribution.
FIG. 2 is a schematic view of an embodiment of a non-uniform air distribution fluidized bed of the present invention.
Fig. 3A to 3B are schematic structural views of the hood in the embodiment shown in fig. 2.
[ reference numerals ]
1-a high-pressure fan air inlet pipeline, 2-an air chamber, 3-an air distribution plate, 4-a blast cap, 5-a tertiary air inlet pipeline, 6-a decomposing furnace outer shell, 7-a waste gas discharge pipeline, 8-a raw material blanking pipe, 9-a coal burning pipeline, 10-a slag discharge port, 11-a central area, 12-an edge area, 13-a nozzle and 14-an air pipe.
Detailed Description
The invention is further described with reference to the accompanying drawings and preferred embodiments.
Referring to fig. 1A to 1B, an embodiment of a fluidized bed boiling decomposition device with non-uniform air distribution according to the present invention is shown. The embodiment comprises a decomposing furnace outer shell 6, a waste gas discharge pipeline 7 arranged at the upper end of the decomposing furnace outer shell, a tertiary air inlet pipeline 5, a raw material discharging pipe 8 and a coal burning pipeline 9 arranged at the lower part of the decomposing furnace outer shell, an air chamber 2 arranged at the lower end of the decomposing furnace outer shell, a high-pressure fan inlet pipeline 1 communicated with the air chamber for allowing air to enter the decomposing furnace outer shell, and an air distribution plate 3 arranged at the top of the air chamber, wherein the components are basic components of a boiling decomposing furnace, and the details are not described.
Referring to fig. 2 and fig. 3A and 3B, an embodiment of a non-uniform air-distribution fluidized bed according to the present invention is shown. The embodiment comprises a circular air distribution plate 3, air caps 4 and a slag discharge port 10, wherein the air caps are densely arranged in the central area of the air distribution plate 3, the air caps are sparsely arranged in the edge area of the air distribution plate 3, and the slag discharge port 10 is arranged in the edge area of the air distribution plate. The method specifically comprises the following steps: the central area of the wind distribution plate is circular, the area of the wind distribution plate accounts for 2/3 of the total area of the wind distribution plate, and the number of the wind caps arranged in the central area is 26-35/m2(ii) a The edge area of the wind distribution plate is annular, the area of the wind distribution plate accounts for 1/3 of the total area of the wind distribution plate, and the number of the wind caps arranged in the edge area is 13-18/m2. The blast cap 4 is including being used for installing the blast cap on the grid plate and with the tuber pipe 14 of air chamber 2 intercommunication, cup joint the second tuber pipe in the tuber pipe, second tuber pipe protrusion is equipped with a plurality of nozzles 13 in the neck of tuber pipe along circumference, the tip is the turn-ups that seals the form and be equipped with the aforesaid nozzle that is used for the shroud, and the turn-ups existence not only can reduce the wearing and tearing of material to the blast cap, can prevent moreover that the nozzle from being blockked up by the material.
Because the central area of the air distribution plate has larger ventilation capacity, the material positioned in the central area is in a fluidized state, otherwise, the ventilation capacity of the edge area is smaller, and the material positioned in the edge area is in a moving bed state. The fluidized bed provided by the embodiment has the characteristic of non-uniform air distribution, so that strong backflow and internal circulation flowing phenomena can be generated in the bed, the flowing mode of the internal circulation is beneficial to prolonging the retention time of materials in the bed, and the decomposition rate of raw materials is improved. Meanwhile, the design of different air output amounts in different areas is adopted by the air distribution plate, so that the material is continuously fluidized and ascended in the central area with higher air output amount, the pressure is increased in the edge area with lower air output amount due to the accumulation of particles, and thus, pressure difference is generated between the low air output area and the high air output area, the particles are continuously pushed to flow from the low air output area to the high air output area under the action of the pressure difference, and a specific particle internal circulation process in the dense-phase area of the non-uniform air distribution fluidized bed is formed.
Under the action of the internal circulation flow of the particles, heat exchange is carried out in the bed to enhance the combustion efficiency, after the fuel enters the fluidized bed, the fuel is mixed with materials in the bed and is rapidly heated and ignited, the particles flow along with the internal circulation, so that the unburnt materials can be well mixed, the retention time of the materials in the bed can be prolonged, the combustion is more complete, and the fuel adaptability is wide.
The above description is only a preferred embodiment of the present invention, and any person skilled in the art can make any simple modification, equivalent change and modification to the above embodiments according to the technical essence of the present invention without departing from the scope of the present invention, and still fall within the scope of the present invention.
Claims (4)
1. A non-uniform air distribution fluidized bed comprises an air distribution plate and is characterized in that air caps are densely arranged in the central area of the air distribution plate, the air caps are sparsely arranged in the edge area of the air distribution plate, and slag discharge ports are arranged in the edge area of the air distribution plate; the blast cap includes the tuber pipe that is used for installing the blast cap on the grid plate, cup joints the second tuber pipe in the tuber pipe, and second tuber pipe protrusion is equipped with a plurality of nozzles along circumference in the neck of tuber pipe, tip and is the turn-ups that seals the form and be equipped with the aforementioned nozzle that is used for the shroud.
2. A non-uniform air-distributing fluidized bed as claimed in claim 1, wherein the number of the air caps arranged in the central region of the air-distributing plate is 26-35/m2The arrangement number of the blast caps in the edge area of the air distribution plate is 13-18/m2。
3. A fluidized bed boiling decomposition device with non-uniform air distribution comprises a decomposition furnace outer shell, a waste gas discharge pipeline arranged at the upper end of the decomposition furnace outer shell, a tertiary air inlet pipeline, a raw material discharging pipe and a coal burning pipeline arranged at the lower part of the decomposition furnace outer shell, an air chamber arranged at the lower end of the decomposition furnace outer shell, a high-pressure fan air inlet pipeline communicated with the air chamber for allowing air to enter the decomposition furnace outer shell, and an air distribution plate arranged at the top of the air chamber; the blast cap is densely arranged in the central area of the air distribution plate, the blast caps are sparsely arranged in the edge area of the air distribution plate, and the slag discharge port is arranged in the edge area of the air distribution plate; the blast cap is including being used for installing the blast cap on the grid plate and with the tuber pipe of air chamber intercommunication, cup joint the second tuber pipe in the tuber pipe, second tuber pipe protrusion is equipped with a plurality of nozzles, tip in the neck of tuber pipe along circumference and is the turn-ups that seals the form and be equipped with the aforementioned nozzle that is used for the shroud.
4. The non-uniform air distribution fluidized bed boiling decomposition device of claim 3, wherein the number of the air caps arranged in the central area of the air distribution plate is 26-35/m2The arrangement number of the blast caps in the edge area of the air distribution plate is 13-18/m2。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010033260.4A CN111237745A (en) | 2020-01-13 | 2020-01-13 | Non-uniform air distribution fluidized bed and non-uniform air distribution fluidized bed boiling decomposition device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010033260.4A CN111237745A (en) | 2020-01-13 | 2020-01-13 | Non-uniform air distribution fluidized bed and non-uniform air distribution fluidized bed boiling decomposition device |
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| CN111237745A true CN111237745A (en) | 2020-06-05 |
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| CN202010033260.4A Pending CN111237745A (en) | 2020-01-13 | 2020-01-13 | Non-uniform air distribution fluidized bed and non-uniform air distribution fluidized bed boiling decomposition device |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1047916A (en) * | 1989-06-08 | 1990-12-19 | 浙江大学 | Fluidized bed calcination boiler for thermo-electricity-cement joint production |
| CN2300874Y (en) * | 1997-05-28 | 1998-12-16 | 张瑞英 | Fludized boiling decomposing furnace |
| CN1204391A (en) * | 1995-10-20 | 1999-01-06 | 伊马特兰福伊马股份公司 | Method and apparatus for controlling temp. of bed of bubbling bed boiler |
| CN1865775A (en) * | 2006-06-09 | 2006-11-22 | 西安交通大学 | Composite circulating fluidized bed system for high performance clean burning of urban domestic garbage |
| CN101387403A (en) * | 2008-10-23 | 2009-03-18 | 北京博奇电力科技有限公司 | Fluidized bed incinerator, circulating fluidized bed incinerator and incineration system |
| CN202561732U (en) * | 2012-03-15 | 2012-11-28 | 格菱动力设备(中国)有限公司 | Air distribution plate and air cap in circulating fluidized bed boiler |
| CN202835341U (en) * | 2012-07-06 | 2013-03-27 | 广东电网公司电力科学研究院 | Differential rotational flow air distribution device for biomass fuel fluidized bed |
| CN103335306A (en) * | 2013-07-09 | 2013-10-02 | 东方电气集团东方锅炉股份有限公司 | Air distribution system and method of circulating fluidized bed boiler |
-
2020
- 2020-01-13 CN CN202010033260.4A patent/CN111237745A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1047916A (en) * | 1989-06-08 | 1990-12-19 | 浙江大学 | Fluidized bed calcination boiler for thermo-electricity-cement joint production |
| CN1204391A (en) * | 1995-10-20 | 1999-01-06 | 伊马特兰福伊马股份公司 | Method and apparatus for controlling temp. of bed of bubbling bed boiler |
| CN2300874Y (en) * | 1997-05-28 | 1998-12-16 | 张瑞英 | Fludized boiling decomposing furnace |
| CN1865775A (en) * | 2006-06-09 | 2006-11-22 | 西安交通大学 | Composite circulating fluidized bed system for high performance clean burning of urban domestic garbage |
| CN101387403A (en) * | 2008-10-23 | 2009-03-18 | 北京博奇电力科技有限公司 | Fluidized bed incinerator, circulating fluidized bed incinerator and incineration system |
| CN202561732U (en) * | 2012-03-15 | 2012-11-28 | 格菱动力设备(中国)有限公司 | Air distribution plate and air cap in circulating fluidized bed boiler |
| CN202835341U (en) * | 2012-07-06 | 2013-03-27 | 广东电网公司电力科学研究院 | Differential rotational flow air distribution device for biomass fuel fluidized bed |
| CN103335306A (en) * | 2013-07-09 | 2013-10-02 | 东方电气集团东方锅炉股份有限公司 | Air distribution system and method of circulating fluidized bed boiler |
Non-Patent Citations (1)
| Title |
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| 国家知识产权局专利审查协作江苏中心: "《热电专利技术分析与运用（第2辑）》", 30 September 2016, 知识产权出版社 * |
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Application publication date: 20200605 |