CN105403060A - Chromium-salt roasting preheater - Google Patents
Chromium-salt roasting preheater Download PDFInfo
- Publication number
- CN105403060A CN105403060A CN201510916151.6A CN201510916151A CN105403060A CN 105403060 A CN105403060 A CN 105403060A CN 201510916151 A CN201510916151 A CN 201510916151A CN 105403060 A CN105403060 A CN 105403060A
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- CN
- China
- Prior art keywords
- cyclone
- rotary kiln
- smoke
- chromium
- preheater
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/004—Systems for reclaiming waste heat
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D13/00—Apparatus for preheating charges; Arrangements for preheating charges
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D13/00—Apparatus for preheating charges; Arrangements for preheating charges
- F27D2013/007—Apparatus for preheating charges; Arrangements for preheating charges using a rotary furnace
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27M—INDEXING SCHEME RELATING TO ASPECTS OF THE CHARGES OR FURNACES, KILNS, OVENS OR RETORTS
- F27M2001/00—Composition, conformation or state of the charge
- F27M2001/03—Charges containing minerals
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Furnace Details (AREA)
Abstract
The invention discloses a chromium-salt roasting preheater used for the chromium-salt industry. The chromium-salt roasting preheater is composed of two stages of cyclone barrels connected in series, a smoke chamber, a chute between the smoke chamber and the tail of a rotary kiln, all stages of smoke ascending pipes, all stages of discharging pipes, air locking valves and the like. The smoke chamber has a rectangular section, and therefore materials are prevented from being accumulated; and the gradient of a base plate of the smoke chamber is larger than 55 degrees. The wrapping angle of the chute between the smoke chamber and the tail of the rotary kiln is larger than 160 degrees. The chute is formed by combining a plurality of H-shaped supporting plates. All the stages of ascending pipes are circular, bent parts connected with the cyclone barrels are in special shapes, and the angles of the bent parts are larger than 50 degrees. The circular ascending pipes are provided with scattering boxes used for material scattering. The stages of discharging pipes are circular and are provided with the air locking valves and expansion joints. The chromium-salt roasting two-stage-cyclone preheater system is used for transforming a chromium-salt roasting rotary kiln of phi4.8*90 m, the yield of roasted chromium salt is increased by 50% or more, the temperature of waste gas is lowered by 240 DEG C, and heat consumption is reduced by 10% or more.
Description
Technical field
The present invention relates to the technical field of chromic salts roasting, relate in particular to a kind of calcining kiln tail Analyses on Cyclone Preheater System for chromic salts roasting.
Background technology
Chromic salts is one of inorganic salts principal item, and in each department of national economy, purposes is extremely wide, is mainly used in the aspects such as plating, tanning, printing and dyeing, medicine, pigment, catalyst, oxidant, match and metal inhibitor.According to commercial department's statistics, chromic salts is relevant with the range of goods of China 10%.
The product variety of Chrome Salt Industry, based on sodium dichromate and chromic anhybride, also produces a small amount of potassium bichromate, chrome oxide green, chromium sulfate basic and part containing chromium pigment product simultaneously.
Adopting chrome ore and caustic soda to make raw material, become chromic salts grog through oxidizing roasting, is the important pilot process that sodium dichromate and chromic anhybride are produced.The calcining technology of the outer chromic salts grog of Now Domestic is hollow firer skill.Hollow kiln is low due to its thermal efficiency, causes the yielding poorly of chromic salts clinker burning, hear rate high.As adopted the hollow firer skill of calcium-free roasting chromic salts grog, rotary kiln unit volume output is 22 ~ 23kg/m
3.h, kiln tail gas temperature 650 ~ 700 DEG C, hear rate reaches more than 1100kcal/kg.cl.
How to improve the production capacity of chromic salts roasting, both at home and abroad at feed proportioning (namely having calcium roasting to be improved to calcium-free roasting), to improve in rotary kiln in oxygen content etc. and be studied and put into practice, but deep research is lacked for the problem that the rotary kiln thermal efficiency is low.The present invention increases by a row cyclone preheater at rotary kiln, the abundant heat exchange under suspended state by air-flow and material, and the heat exchange efficiency of the system greatly improved, significantly improves the temperature of charge into rotary kiln, and the EGT that simultaneity factor is discharged obviously declines.Chromic salts roasting Analyses on Cyclone Preheater System of the present invention has filled up the blank of domestic and international chromic salts industry.
Summary of the invention
The object of the invention is on existing rotary kiln basis, a kind of kiln tail Analyses on Cyclone Preheater System for chromic salts roasting is provided, improve the production capacity of rotary kiln, reduce system hear rate.
For achieving the above object, the technical solution used in the present invention is:
For a kiln tail cyclone preheater for chromic salts roasting, comprise the compositions such as smoke-box, chute, mulitistage cyclone, flue gas increase in pipeline at different levels, tremie pipe at different levels and the air valve being arranged on rotary kiln.When rotary kiln draw ratio is greater than 22, adopt one cyclonic preheater; During rotary kiln draw ratio 18 ~ 22, adopt two stage cyclone preheater; When rotary kiln draw ratio is less than 18, adopt three grades of cyclone preheaters.
For two stage cyclone pre-heating system, chromic salts roasting kiln tail preheater of the present invention is composed in series by two stage cyclone cylinder (1,2).Kiln tail smoke-box is connected with subordinate's cyclone cylinder (1) flue gas increase in pipeline (4), preheating material from higher level's cyclone cylinder (2) carries out suspension heat exchange with the high-temperature flue gas from rotary kiln in increase in pipeline (4), and jointly enter subordinate's cyclone cylinder (1), and carry out gas solid separation.The material that subordinate's cyclone cylinder (1) is collected enters calcined by rotary kiln by blanking pipe (6).Tremie pipe (6) is furnished with air valve and expansion joint.The exit gas of subordinate's cyclone cylinder (1) enters the flue gas increase in pipeline (5) be connected with higher level's cyclone cylinder (2), and this increase in pipeline is provided with raw material entrance, and has the spreading case for material dispersion.In the connection increase in pipeline (5) of subordinate's cyclone cylinder (1) and higher level's cyclone cylinder (2), raw material and the waste gas from subordinate's cyclone cylinder carry out suspension heat exchange, and jointly enter higher level's cyclone cylinder and be separated (1).The material collected of higher level's cyclone cylinder (1) enters cyclone cylinder (1) by blanking pipe (7) and is connected increase in pipeline with cyclone cylinder (2) and carries out secondary preheating, and the waste gas going out higher level's cyclone cylinder (1) enters exhaust treatment system.
Compared with prior art, the advantage that has of the present invention and good effect are:
By above-mentioned two stage cyclone pre-heating system, material is through twice suspension heat exchange, and the temperature of charge finally entering rotary kiln improves more than 600 DEG C, the output increased more than 50% of therefore rotary kiln chromic salts calcining.The EGT going out preheater is reduced to 400 ~ 450 DEG C by 650 ~ 700 DEG C, and therefore the hear rate of chromic salts grog reduces by more than 10%.
Chromic salts roasting kiln tail preheater smoke-box (8) of the present invention is square-section.Prevent solid accumulation, bottom board slope is greater than 55 °.The chute (9) that described kiln tail smoke-box comprises and arranges between rotary kiln afterbody, the cornerite of described chute is greater than 160 °.Chute is formed by some supporting plate combinations, and supporting plate is H-shaped, forms labyrinth seal with the reducing of rotary kiln, and object is the sealing function increasing kiln tail rotary kiln, prevents kiln Caudad to leak outside material.
The kiln tail smoke-box of chromic salts calcining kiln tail Analyses on Cyclone Preheater System of the present invention be circular with the connecting pipe of most subordinate's cyclone cylinder connecting pipe and cyclone cylinder at different levels, and be special-shaped with cyclone cylinder connecting bend part, inclined bottom surface angle is greater than 60 °.
The most higher level's preheater of chromic salts roasting kiln tail preheater of the present invention to be ratio of height to diameter be 3 cyclone cylinder; All the other at different levels for ratio of height to diameter be the cyclone cylinder of 2.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, the accompanying drawing in the following describes is only some embodiments of the present invention.
Fig. 1 is secondary cyclone preheater process flow diagram of the present invention;
Fig. 2 is increase in pipeline structural representation of the present invention;
Fig. 3 is smoke-box structural representation of the present invention;
Fig. 4 is H-shaped support board structure schematic diagram of the present invention.
Reference numeral: 1, subordinate's cyclone cylinder; 2, higher level's cyclone cylinder; 3, kiln tail smoke-box; 4, the increase in pipeline of smoke-box and most subordinate cyclone cylinder; 5, the increase in pipeline of most subordinate's cyclone cylinder and higher level's cyclone cylinder; 6, subordinate's cyclone cylinder blanking pipe; 7, higher level's cyclone cylinder blanking pipe; 8, rotary kiln; 9, the chute be made up of H-shaped supporting plate.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described.Obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, and any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Embodiment one
As shown in Figure 1, for two stage cyclone preheater, chromic salts calcining kiln tail cyclone preheater of the present invention is composed in series by two stage cyclone cylinder (1,2).Kiln tail smoke-box is connected with subordinate's cyclone cylinder (1) increase in pipeline (4), preheating material from higher level's cyclone cylinder (2) carries out suspension heat exchange with the high-temperature flue gas from rotary kiln in increase in pipeline (4), and jointly enter subordinate's cyclone cylinder (1), and carry out gas solid separation.The material that subordinate's cyclone cylinder (01) is collected enters calcined by rotary kiln by blanking pipe (6).Tremie pipe (6) is furnished with air valve and expansion joint.The exit gas of subordinate's cyclone cylinder (1) enters the increase in pipeline (5) be connected with higher level's cyclone cylinder (2), and this increase in pipeline is provided with raw material entrance, and has the spreading case for material dispersion.In the connection increase in pipeline (5) of subordinate's cyclone cylinder (1) and higher level's cyclone cylinder (2), raw material and the waste gas from most subordinate cyclone cylinder carry out suspension heat exchange, and jointly enter higher level's cyclone cylinder and be separated (1).The material collected of higher level's cyclone cylinder (1) enters cyclone cylinder (1) by blanking pipe (7) and is connected increase in pipeline with cyclone cylinder (2) and carries out second time preheating.
As shown in Figure 2, the increase in pipeline of chromic salts calcining kiln tail cyclone preheater of the present invention is circular configuration, and be polymorphic structure with cyclone cylinder connecting bend part, the angle of elbow bottom surface is greater than 60 °.
As shown in Figure 3, the smoke-box of chromic salts calcining kiln tail cyclone preheater of the present invention is square-section, and the angle of bottom surface is greater than 55 °, and object is to reduce the buildup bottom smoke-box.
As shown in Figure 4, the smoke-box included by chromic salts calcining kiln tail cyclone preheater of the present invention and form the H-shaped supporting plate of chute between rotary kiln, can form labyrinth seal with rotary kiln reducing, add the sealing function of kiln tail, prevents kiln Caudad to leak outside material.
Of the present invention for chromic salts calcining kiln tail Analyses on Cyclone Preheater System, for Φ 4.8 × 90 meters of chromic salts calcination rotary kiln transformations, chromic salts clinker improves more than 50%, and EGT reduces by 240 DEG C, and hear rate reduces by more than 10%.Technical indicator comparison sheet before and after transformation is as follows:
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention.All any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (5)
1. for a kiln tail Analyses on Cyclone Preheater System for chromic salts industry chromic salts roasting, it is characterized in that: comprise the Analyses on Cyclone Preheater System being arranged on rotary kiln and be made up of smoke-box, the chute between smoke-box and rotary kiln, cyclone cylinder at different levels, flue gas increase in pipeline at different levels, tremie pipe at different levels and air valve etc.
2. the kiln tail Analyses on Cyclone Preheater System of chromic salts roasting according to claim 1, is characterized in that: when rotary kiln draw ratio is greater than 22, adopts one cyclonic preheater; During rotary kiln draw ratio 18 ~ 22, adopt two stage cyclone preheater; When rotary kiln draw ratio is less than 18, adopt three grades of cyclone preheaters.
3. described in the kiln tail Analyses on Cyclone Preheater System of chromic salts roasting according to claim 1 and 2, smoke-box is square-section.Prevent solid accumulation, smoke-box bottom board slope is greater than 55 °.The chute that described kiln tail smoke-box comprises and arranges between rotary kiln afterbody, the cornerite of described chute is greater than 160 °.Chute is formed by some supporting plate combinations, and supporting plate is H-shaped, and object is the function increasing the sealing of kiln tail.
4. the kiln tail Analyses on Cyclone Preheater System of chromic salts roasting according to claim 1 and 2, is characterized in that: described first order cyclone preheater to be ratio of height to diameter be 3 cyclone cylinder; All the other at different levels for ratio of height to diameter be the cyclone cylinder of 2.Cyclone cylinder arranged in series at different levels.
5. the kiln tail Analyses on Cyclone Preheater System of chromic salts roasting according to claim 1 and 2, increase in pipeline at different levels is round, and the elbow part be connected with cyclone cylinder is abnormity, and angle is greater than 50 °.Round increase in pipeline is provided with the spreading case for material dispersion.Tremie pipe at different levels is circular, and is furnished with air valve, expansion joint.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510916151.6A CN105403060A (en) | 2015-12-09 | 2015-12-09 | Chromium-salt roasting preheater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510916151.6A CN105403060A (en) | 2015-12-09 | 2015-12-09 | Chromium-salt roasting preheater |
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| Publication Number | Publication Date |
|---|---|
| CN105403060A true CN105403060A (en) | 2016-03-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510916151.6A Pending CN105403060A (en) | 2015-12-09 | 2015-12-09 | Chromium-salt roasting preheater |
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| CN (1) | CN105403060A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10245248A (en) * | 1997-03-03 | 1998-09-14 | Nippon Cement Co Ltd | Production of cement clinker utilizing waste steel cans |
| CN101475324A (en) * | 2009-01-31 | 2009-07-08 | 合肥水泥研究设计院 | Technological process for producing cement clinker by dry burning carbide slag |
| CN104896917A (en) * | 2015-06-26 | 2015-09-09 | 南京恒海水泥工程设计有限公司 | Calcining kiln tail system for cement production |
| CN105036168A (en) * | 2015-05-21 | 2015-11-11 | 山东鲁北企业集团总公司 | High-temperature-calcined [alpha]-Al2O3 production energy-saving apparatus and novel method |
-
2015
- 2015-12-09 CN CN201510916151.6A patent/CN105403060A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10245248A (en) * | 1997-03-03 | 1998-09-14 | Nippon Cement Co Ltd | Production of cement clinker utilizing waste steel cans |
| CN101475324A (en) * | 2009-01-31 | 2009-07-08 | 合肥水泥研究设计院 | Technological process for producing cement clinker by dry burning carbide slag |
| CN105036168A (en) * | 2015-05-21 | 2015-11-11 | 山东鲁北企业集团总公司 | High-temperature-calcined [alpha]-Al2O3 production energy-saving apparatus and novel method |
| CN104896917A (en) * | 2015-06-26 | 2015-09-09 | 南京恒海水泥工程设计有限公司 | Calcining kiln tail system for cement production |
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| SE01 | Entry into force of request for substantive examination | ||
| DD01 | Delivery of document by public notice |
Addressee: NANJING HENGHAI CEMENT ENGINEERING DESIGN CO., LTD. Document name: Notification of Publication and of Entering the Substantive Examination Stage of the Application for Invention |
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| DD01 | Delivery of document by public notice |
Addressee: NANJING HENGHAI CEMENT ENGINEERING DESIGN CO., LTD. Document name: the First Notification of an Office Action |
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20160316 |
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| WD01 | Invention patent application deemed withdrawn after publication |