CN105293546A - Gas suspension roasting furnace positive-negative pressure two-stage operation process method - Google Patents
Gas suspension roasting furnace positive-negative pressure two-stage operation process method Download PDFInfo
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- CN105293546A CN105293546A CN201410293993.6A CN201410293993A CN105293546A CN 105293546 A CN105293546 A CN 105293546A CN 201410293993 A CN201410293993 A CN 201410293993A CN 105293546 A CN105293546 A CN 105293546A
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Abstract
The invention discloses a gas suspension roasting furnace positive-negative pressure two-stage operation process method, and relates to the technical field of aluminum oxide production. According to the invention, a booster fan is used at a fourth-level cooling cyclone inlet of a roasting furnace system, and air is delivered into a four-level cyclone cooling system with a positive pressure; during the operation, a zero pressure point is set at the gas outlet of one cyclone cooler of the four-level cyclone cooling system. In a same roasting furnace system, positive and negative pressures exist at a same time. Negative-pressure operation is adopted in a drying stage, and positive-pressure operation is adopted in certain levels of cyclones in a cooling stage. With the method, gas suspension roasting furnace production capacity can be effectively improved, investment and operation cost can be saved, and operation and running stability of the entire roasting furnace system can be improved.
Description
Technical field
The present invention relates to the technique of Aluminium hydroxide roasting in a kind of aluminum oxide production process, belong to technical field of alumina production.
Background technology
The widely used gaseous pollutant control of current domestic calcinations of aluminum hydroxide all adopts full negative-pressure operation, and negative-pressure operation easily produces Air Leakage, makes in the inclusion of air roaster system in environment.Leaking out of system defines wind short circuit in dryer section, except causing the increase of stoving oven hear rate, wastes energy, reduces outside the heat utilization efficiency of roaster system, the negative pressure of system also can be made to reduce.And the negative pressure of whole system reduces, the air output of blast inlet can be caused to diminish, the combustion air of stoving oven is reduced, the production capacity of influential system and operating safety, and the floating velocity of blast inlet is declined, cause air inlet blanking, pollute environment, have lost product aluminum oxide.
Summary of the invention
In order to solve the problems of the technologies described above, the invention provides a kind of gaseous pollutant control positive/negative-pressure two sections of operating procedures, object is that stoving oven Air Leakage is weakened, and increases the stability that the operation of whole roaster system runs, and then improves the production capacity of stoving oven.
In order to solve the problems of the technologies described above, the present invention is achieved in that
A kind of gaseous pollutant control positive/negative-pressure two sections of operating procedure methods, charging wet hydrogen aluminum oxide is dried in venturi drier, after dried material carries out gas solid separation in one cyclonic preheater, be preheated in secondary cyclone preheater and slough partial crystallization water; Final roasting and the control of quality product complete in stoving oven; Lower one-step cooling sent into by finished product aluminum oxide after the cooling of Category Four cyclone water cooler; In roasting process, institute's heat requirement is provided by liquid or geseous fuel, and the air of the heat preheating that finished product aluminum oxide discharges in Category Four cyclone water cooler is for burning; Stoving oven high-temp waste gas out, via after the aluminium hydroxide heat absorption cooling in two stage cyclone preheater and venturi drier, is sent to dust-removal system; A booster fan is adopted in the fourth stage cooling cyclone cylinder ingress of system, air positive pressure is sent into Category Four cyclone cooling system, neutral point is located at one-level, secondary, three grades of arbitrary cooling cyclone exits to ensure that dryer section adopts negative-pressure operation, in cooling section, some grade of cooling cyclone adopts positive pressure operation.
Preferred forms neutral point is located at secondary rotary forced air cooler exit.
Neutral point can also be located at one cyclonic cooler outlet place or neutral point be located at three grades of cooling cyclone exits.
Described booster fan is subcontrol production capacity means, and the exhaust blower of gaseous pollutant control system is taken as the leading factor and controlled production capacity means.
Advantage of the present invention and effect as follows:
1. the neutral point of system is in the exit from the cooling cyclone close to stoving oven, adds the stability that the operation of whole roaster system runs.
2. by little than full negative-pressure operation technique of the operating mode air quantity of each cyclone cylinder and stoving oven, little than full negative-pressure operation technique of the diameter of each cyclone cylinder, also few by the air quantity of exhaust blower, certain investment and working cost can be saved, reduce cost.
If 3. the stoving oven of a full negative-pressure operation will make positive/negative-pressure two sections operation into, the unit thermal load of stoving oven can improve than during full negative-pressure operation, and that is the production capacity of whole roaster system can improve.
4. this positive/negative-pressure two sections of operating procedures, the area higher at height above sea level can be advantageously.
Accompanying drawing explanation
Fig. 1 is gaseous pollutant control positive/negative-pressure of the present invention two sections of operation technological process figure.
In figure: 1 is venturi drier; 2 is one cyclonic preheater; 3 is secondary cyclone preheater; 4,5 is stoving oven; 6 ~ 9 is cooling cyclone; 10 is booster fan.
A is aluminium hydroxide; B is aluminum oxide; C is fuel; D is waste gas; E is air.
Two dot chain line is air (or waste gas), and dotted line is aluminum oxide (or aluminium hydroxide) and air (or waste gas) mixture, and solid line is aluminum oxide (or aluminium hydroxide), and broken line is fuel.
Embodiment
Below inventive embodiment is described in detail by reference to the accompanying drawings, but protection scope of the present invention not limit by embodiment.
As shown in Figure 1, present invention process is as follows: a is dried in venturi drier 1 for charging wet hydrogen aluminum oxide, after dried material carries out gas solid separation in one cyclonic preheater 2, is preheated and sloughs partial crystallization water in secondary cyclone preheater 3.Final roasting and the control of quality product complete in stoving oven 4,5.Finished product aluminum oxide b sends into lower one-step cooling after Category Four cyclone water cooler 6 ~ 9 cools.In roasting process, institute's heat requirement is provided by liquid or geseous fuel c, and the air through Category Four cyclone water cooler 6 ~ 9 preheating is used for burning.Stoving oven high-temp waste gas d out, via after two stage cyclone preheater and venturi drier cooling, is sent to dust-removal system.A booster fan 10 is adopted at the cold wind mouth of system, air e malleation is sent into Category Four cyclone cooling system, at the present embodiment, neutral point is located at secondary rotary forced air cooler exit, neutral point can also be located at one cyclonic cooler outlet place or neutral point be located at three grades of cooling cyclone exits.
Claims (5)
1. a gaseous pollutant control positive/negative-pressure two sections of operating procedure methods, it is characterized in that: charging wet hydrogen aluminum oxide is dried in venturi drier, after dried material carries out gas solid separation in one cyclonic preheater, be preheated in secondary cyclone preheater and slough partial crystallization water; Final roasting and the control of quality product complete in stoving oven; Lower one-step cooling sent into by finished product aluminum oxide after the cooling of Category Four cyclone water cooler; In roasting process, institute's heat requirement is provided by liquid or geseous fuel, and the air of the heat preheating that finished product aluminum oxide discharges in Category Four cyclone water cooler is for burning; Stoving oven high-temp waste gas out, via after the aluminium hydroxide heat absorption cooling in two stage cyclone preheater and venturi drier, is sent to dust-removal system; A booster fan is adopted in the fourth stage cooling cyclone cylinder ingress of system, air positive pressure is sent into Category Four cyclone cooling system, neutral point is located at one-level, secondary, three grades of arbitrary cooling cyclone exits to ensure that dryer section adopts negative-pressure operation, in cooling section, some grade of cooling cyclone adopts positive pressure operation.
2. gaseous pollutant control positive/negative-pressure according to claim 1 two sections of operating procedure methods, is characterized in that: neutral point is located at secondary rotary forced air cooler exit.
3. gaseous pollutant control positive/negative-pressure according to claim 1 two sections of operating procedure methods, is characterized in that: neutral point is located at one cyclonic cooler outlet place.
4. gaseous pollutant control positive/negative-pressure according to claim 1 two sections of operating procedure methods, is characterized in that: neutral point is located at three grades of cooling cyclone exits.
5. gaseous pollutant control positive/negative-pressure according to claim 1 two sections of operating procedure methods, is characterized in that: described booster fan is subcontrol production capacity means, and the exhaust blower of gaseous pollutant control system is taken as the leading factor and controlled production capacity means.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410293993.6A CN105293546A (en) | 2014-06-26 | 2014-06-26 | Gas suspension roasting furnace positive-negative pressure two-stage operation process method |
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| CN201410293993.6A CN105293546A (en) | 2014-06-26 | 2014-06-26 | Gas suspension roasting furnace positive-negative pressure two-stage operation process method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106621752A (en) * | 2016-12-23 | 2017-05-10 | 沈阳鑫博工业技术股份有限公司 | Fume denitration device for aluminum oxide suspension calcinator and use method thereof |
| CN107243235A (en) * | 2017-06-16 | 2017-10-13 | 江苏科行环保科技有限公司 | A kind of aluminium oxide calcining composite S NCR SCR flue-gas denitration process |
| CN107606949A (en) * | 2017-09-27 | 2018-01-19 | 河南科达东大国际工程有限公司 | A kind of gas suspension calcination of aluminium hydroxide stove low-temperature bake device |
| CN108398018A (en) * | 2018-03-09 | 2018-08-14 | 湖南科技大学 | A kind of fine powder suspension calciner and its method of roasting |
| CN108622922A (en) * | 2018-07-09 | 2018-10-09 | 中铝集团山西交口兴华科技股份有限公司 | A kind of aluminium oxide returning charge calciner and method |
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| US4308088A (en) * | 1978-11-18 | 1981-12-29 | Giulini Chemi Gmbh | Macrocrystalline aluminum oxide and method for its manufacture |
| CN101749723A (en) * | 2008-12-03 | 2010-06-23 | 沈阳铝镁设计研究院 | Smoke temperature adjusting structure of cold air valve on descending flue of gas suspension calciner |
| CN103771476A (en) * | 2014-01-26 | 2014-05-07 | 郑州金阳光陶瓷有限公司 | Method for producing alpha-aluminum oxide by utilizing gas-suspension roasting furnace |
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| US4308088A (en) * | 1978-11-18 | 1981-12-29 | Giulini Chemi Gmbh | Macrocrystalline aluminum oxide and method for its manufacture |
| CN101749723A (en) * | 2008-12-03 | 2010-06-23 | 沈阳铝镁设计研究院 | Smoke temperature adjusting structure of cold air valve on descending flue of gas suspension calciner |
| CN103771476A (en) * | 2014-01-26 | 2014-05-07 | 郑州金阳光陶瓷有限公司 | Method for producing alpha-aluminum oxide by utilizing gas-suspension roasting furnace |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106621752A (en) * | 2016-12-23 | 2017-05-10 | 沈阳鑫博工业技术股份有限公司 | Fume denitration device for aluminum oxide suspension calcinator and use method thereof |
| CN106621752B (en) * | 2016-12-23 | 2024-03-08 | 沈阳鑫博工业技术股份有限公司 | Flue gas denitration device of alumina suspension roasting furnace and use method of flue gas denitration device |
| CN107243235A (en) * | 2017-06-16 | 2017-10-13 | 江苏科行环保科技有限公司 | A kind of aluminium oxide calcining composite S NCR SCR flue-gas denitration process |
| CN107606949A (en) * | 2017-09-27 | 2018-01-19 | 河南科达东大国际工程有限公司 | A kind of gas suspension calcination of aluminium hydroxide stove low-temperature bake device |
| CN108398018A (en) * | 2018-03-09 | 2018-08-14 | 湖南科技大学 | A kind of fine powder suspension calciner and its method of roasting |
| CN108398018B (en) * | 2018-03-09 | 2019-08-30 | 湖南科技大学 | A kind of fine powder suspension calciner and its method of roasting |
| CN108622922A (en) * | 2018-07-09 | 2018-10-09 | 中铝集团山西交口兴华科技股份有限公司 | A kind of aluminium oxide returning charge calciner and method |
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Application publication date: 20160203 |