CN87100767A - The device of preheating and calcination of powder raw material - Google Patents
The device of preheating and calcination of powder raw material Download PDFInfo
- Publication number
- CN87100767A CN87100767A CN198787100767A CN87100767A CN87100767A CN 87100767 A CN87100767 A CN 87100767A CN 198787100767 A CN198787100767 A CN 198787100767A CN 87100767 A CN87100767 A CN 87100767A CN 87100767 A CN87100767 A CN 87100767A
- Authority
- CN
- China
- Prior art keywords
- cyclone
- gas
- conduit
- rotary kiln
- raw material
- 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
Links
- 239000002994 raw material Substances 0.000 title claims abstract description 31
- 238000001354 calcination Methods 0.000 title claims abstract description 10
- 239000000843 powder Substances 0.000 title description 3
- 239000004449 solid propellant Substances 0.000 claims description 6
- 238000002485 combustion reaction Methods 0.000 abstract description 10
- 235000008733 Citrus aurantifolia Nutrition 0.000 abstract description 3
- 235000011941 Tilia x europaea Nutrition 0.000 abstract description 3
- 239000004568 cement Substances 0.000 abstract description 3
- 239000004571 lime Substances 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 33
- JTJMJGYZQZDUJJ-UHFFFAOYSA-N phencyclidine Chemical class C1CCCCN1C1(C=2C=CC=CC=2)CCCCC1 JTJMJGYZQZDUJJ-UHFFFAOYSA-N 0.000 description 6
- 239000000446 fuel Substances 0.000 description 4
- 238000000926 separation method Methods 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B7/00—Hydraulic cements
- C04B7/36—Manufacture of hydraulic cements in general
- C04B7/43—Heat treatment, e.g. precalcining, burning, melting; Cooling
- C04B7/434—Preheating with addition of fuel, e.g. calcining
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
- F27B7/20—Details, accessories or equipment specially adapted for rotary-drum furnaces
- F27B7/2016—Arrangements of preheating devices for the charge
- F27B7/2025—Arrangements of preheating devices for the charge consisting of a single string of cyclones
- F27B7/2033—Arrangements of preheating devices for the charge consisting of a single string of cyclones with means for precalcining the raw material
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)
- Furnace Details (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
一种用以预热和煅烧粉末原料的，特别用于水泥和石灰原料加工(例如在回转窑燃烧之前)的装置包括若干以串联方式连接的竖囱和旋风段。一个回转窑进气室的引导气体的气体通道连接到一个下旋风段，该段的原料排出导管进入回转窑的进气室，而且中旋风段的原料排出导管进入把回转窑的进气室引到下旋风段的气体通道中。A device for preheating and calcining powdered raw materials, especially for the processing of cement and lime raw materials (eg prior to combustion in a rotary kiln), consists of several shafts and cyclone sections connected in series. A gas channel for guiding the gas in the intake chamber of a rotary kiln is connected to a lower cyclone section, the raw material discharge duct of this section enters the intake chamber of the rotary kiln, and the raw material discharge duct of the middle cyclone section enters the intake chamber of the rotary kiln. into the gas channel of the lower cyclone section.
Description
The invention relates to a device for preheating and calcining powder raw materials by using a chimney and a cyclone heat exchanger, which is particularly used for processing cement and lime raw materials, such as preheating and calcining cement and lime before entering a rotary kiln for heat treatment.
Known chimney heat exchangers are equipped with one or two co-current cyclone stages in their upper part, so that in a typical chimney, heat exchange takes place in counter-current and co-current manner of the cyclone heat exchanger. The disadvantage of this arrangement is that the large vertical counterflow chimney of the large scale plant has very low thermal efficiency, thus reducing the efficiency of the kiln system heat exchange.
Furthermore, in the known apparatus, a cyclone is installed in front of the counterflow chimney. However, even with a considerable chimney height, this heating method does not achieve the required degree of efficiency in the typical counterflow chimney due to the volume of the counterflow chimney.
It is an object of the present invention to obviate or at least substantially reduce the above-mentioned disadvantages by providing an apparatus for preheating and calcining a powdered raw material, which apparatus comprises a chimney section having two cyclone sections connected to its gas outlet conduit, whereby all sections are connected in series in the direction of gas advance, any of which sections may comprise one or more cyclones or chimneys, which cyclones or chimneys are connected in parallel, and which is provided with means for feeding and removing the raw material and gas, whereby the gas channel of the inlet chamber of the rotary kiln is connected to the lower cyclone section, the raw material discharge conduit of the lower cyclone section leads into the bottom of the rotary kiln, and the raw material discharge conduit of the intermediate cyclone section leads into the gas channel, which leads the inlet chamber of the rotary kiln to the lower cyclone section. At least one burner extends into the gas passage leading the inlet chamber to the lower cyclone stage. A conduit for tertiary calcining air may be introduced into the gas passage from the inlet plenum to the lower cyclone stage. The feed of solid fuel may extend to the feed discharge conduit of the intermediate cyclone stage or ultimately to the base of the intermediate cyclone stage.
If the efficiency of the heat exchanger reaches its optimum value, the apparatus of the invention can then reduce the height of the chimney preheater. Also in larger installations, the tangential gas inlets into the bottom of the shaft furnace may be located at different heights, in terms of the size and weight of the chimney. The proposed device also enables to reduce investment costs by using the automatic support properties of a shorter heat exchanger shaft furnace, due to the possibility of earthquakes and the possibility of requiring a considerable support structure for the whole heat exchanger element depending on the climatic conditions. In addition, the preheating cyclone section is arranged in front of the shaft furnace heat exchanger, and the dispersion of raw materials in airflow is ensured, so that the preheating cyclone section has good influence on the service life of the heat exchanger part of the shaft furnace. The apparatus of the invention is particularly suitable for use in higher throughput apparatus for a shaft chimney heat exchanger fitted with a single-pass arrangement.
In the front view of the drawing, an example embodiment of the device of the invention is diagrammatically shown.
A gas channel 3 is connected to the inlet chamber 2 of the rotary kiln 1, which gas channel 3 ends in a lower cyclone section consisting of a single large-space cyclone 4. The raw material discharge conduit 5 of the lower cyclone 4 is introduced into the inlet chamber 2 of the rotary kiln 1.
The gas outlet 6 of the lower cyclone stage 4 is connected to a middle cyclone stage consisting of two middle cyclones 7. These material discharge conduits are connected to a gas passage 3 leading from the gas inlet chamber 2 of the swing choke 1. The conduit 9 connects the cyclones 7 of the central cyclone section tangentially to the bottom of a cylindrical counterflow chimney 10, narrowing at the top of the chimney 10 into a small chimney 12 and terminating in a gradually expanding cyclone 13, the discharge conduit 14 of the gradually expanding cyclone 13 terminating at the top of the chimney 10. The bottom of the shaft furnace 10 is connected to the gas outlet 6 by a material discharge conduit 11.
It is also possible to mount a further upper cyclone stage comprising an upper cyclone 16 and connected to the gradually expanding cyclone 13 by a conduit 15 above the small chimney 12. The raw material discharge conduit 17 of the upper cyclone 16 terminates to the small chimney 12. Each upper cyclone 16 is provided with its own gas outlet 18.
In another embodiment where the chimney 10 has only one cyclone 13 extending gradually from the top, the feed is fed to the small chimney 12 via an outlet conduit 19. In the case of two classifying cyclones 13 and two upper cyclones 16, the raw material can be fed into the conduit 15 through the conduit 20.
To increase the degree of calcination of the raw material, a burner 21 for supplying combustion air of the rotary kiln 1 or a separate duct 24 for injecting tertiary combustion air into the gas channel 3 may be connected to the gas channel 3.
On the other hand, the solid fuel supply conduit 22 may extend into the discharge conduit of the medium cyclone 7, or a similar supply conduit 23 may extend into the raw material discharge pipe 8 of the medium cyclone 7.
The raw material is loaded into a conduit 15 through a conduit 20 and is carried into an upper fan 16 by gas, after separation, the raw material enters a small vertical chimney 12 through a discharge conduit 17, and after separation, the raw material is introduced into the top of the vertical chimney 10 through a discharge conduit 14.
In another embodiment having a single, gradually expanding cyclone 13 at the top of the chimney 10, the feed is delivered through an inlet conduit 19 terminating in a small chimney 12 where the gas flow entrains feed into the gradually expanding cyclone 13 and from there through one or more discharge conduits 14 into the top of the chimney 10.
The raw material is finely dispersed in a counter-current gas flow through a chimney 10, from where it passes through a discharge conduit 11 into a gas outlet 6, with the outlet 6 carrying the raw material into a medium cyclone 7. After separation in the middle cyclone 7, the raw material falls into the gas channel 3 through the raw material discharge conduit 8 and is brought into the lower cyclone 4 by gas, and after separation of the preheated and properly calcined raw material, it enters the gas inlet chamber 2 of the rotary kiln 1 through the raw material discharge conduit 5 for final combustion.
If a higher degree of calcination of the raw material is desired, fuel may be fed to the gas channel 3 through the burner 21. Combustion of the fuel can thus be carried out with combustion air supplied by the rotary kiln 1 or with tertiary combustion air supplied by a separate conduit 24.
If solid fuel is used, a longer conduit is required for the combustion to introduce the solid fuel into the discharge conduit of the cyclone 7 via the fuel supply conduit 22 or into the raw material discharge conduit 8 from the cyclone 7 via the combustion supply conduit 23. The fuel is preheated along a longer conduit to its ignition temperature and then combusted in the presence of combustion air provided by the rotary kiln 1 or tertiary air supplied through a separate conduit 24 in conjunction with the transport of the feedstock in the gas channel 3 and lower cyclone 4.
The hot gases leave the rotary kiln 1, enter the gas duct 3 through the inlet chamber 2, are introduced through the gas duct 3 into the lower cyclone 4, from there through the gas exhaust duct 6 into the middle cyclone 7, from there tangentially into the counterflow chimney 10. Thereafter, the continuously rotating gas enters the small chimney 12.
When the upper cyclone 16 is connected to the top of the apparatus, gas enters the cyclone 16 through the conduit 15. Therefore, the gas escapes to the outside of the heating process through the outlet 18.
Claims (5)
1. Apparatus for preheating and calcining a powdered feedstock comprising a chimney section, a cyclone section connected to the gas outlet conduit of the chimney section and a cyclone section connected to the gas inlet conduit of the chimney section, all of the sections being connected in series along the direction of gas advance, wherein each section may consist of more than one cyclone or chimney connected in parallel, and also comprising feed and removal means for the feedstock and gas, characterized in that: the gas channel 3 of the inlet chamber 2 of the rotary kiln 1 is connected to the lower cyclone stage 4, the raw material discharge conduit 5 of said lower cyclone stage 4 enters the bottom of the inlet chamber 2 of the rotary kiln 1 and the raw material discharge conduit 8 of the intermediate cyclone stage 7 enters the gas channel 3 from the inlet chamber 2 of the rotary kiln 1 to the lower cyclone stage 4.
2. The apparatus of claim 1, wherein: at least one burner 21 extends into the gas channel 3 leading the inlet chamber 2 of the rotary kiln 1 to the lower cyclone stage 4.
3. The apparatus of claim 1 or 2, wherein: a conduit 24 for tertiary air extends into the gas passage 3 from the inlet chamber 2 of the rotary kiln 1 to the lower cyclone stage 4.
4. The apparatus of claim 1, 2 or 3, wherein: a solid fuel supply conduit 23 is connected to the feed discharge conduit 8 of the intermediate cyclone stage 7.
5. The apparatus of claim 1, 2, 3 or 4, wherein: a solid fuel supply conduit 22 extends into the bottom of the intermediate cyclone stage 7.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CS863651A CS263617B1 (en) | 1986-05-20 | 1986-05-20 | Device for progressive calcination of powdered materials |
| CN198787100767A CN87100767A (en) | 1986-05-20 | 1987-02-17 | The device of preheating and calcination of powder raw material |
| DE3735825A DE3735825C2 (en) | 1986-05-20 | 1987-10-22 | Apparatus for calcining powdery materials |
| HU875024A HU201145B (en) | 1986-05-20 | 1987-11-11 | Apparatus for continuous calcinating dustlike materials |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CS863651A CS263617B1 (en) | 1986-05-20 | 1986-05-20 | Device for progressive calcination of powdered materials |
| CN198787100767A CN87100767A (en) | 1986-05-20 | 1987-02-17 | The device of preheating and calcination of powder raw material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN87100767A true CN87100767A (en) | 1988-08-31 |
Family
ID=39363842
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN198787100767A Pending CN87100767A (en) | 1986-05-20 | 1987-02-17 | The device of preheating and calcination of powder raw material |
Country Status (4)
| Country | Link |
|---|---|
| CN (1) | CN87100767A (en) |
| CS (1) | CS263617B1 (en) |
| DE (1) | DE3735825C2 (en) |
| HU (1) | HU201145B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101984319A (en) * | 2010-12-08 | 2011-03-09 | 鞍山市华杰建材技术开发有限公司 | Energy-saving and efficiency-improvement double-temperature-field rotary kiln system |
| CN103105067A (en) * | 2013-03-06 | 2013-05-15 | 刘红锁 | Powdery material suspension type heat exchanger device and powdery material heat exchanger system |
| CN106111360A (en) * | 2016-06-21 | 2016-11-16 | 常熟理工学院 | Compound cyclone separator |
Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DK174194B1 (en) * | 1998-02-04 | 2002-09-09 | Smidth & Co As F L | Furnace systems, as well as processes for making cement |
| DE19917310A1 (en) * | 1999-04-16 | 2000-10-19 | Krupp Polysius Ag | Material treatment equipment, especially for cement raw material calcination, has a flow diversion chamber with an impact wall transverse to material flow entering from a rising pipe branch |
| US6773259B1 (en) * | 2003-08-05 | 2004-08-10 | Giant Cement Holding Inc. | Continuous solid waste derived fuel feed system for calciner kilns |
| DE10358317A1 (en) * | 2003-12-12 | 2005-07-14 | Polysius Ag | Plant and process for the thermal treatment of raw material |
| WO2022200219A1 (en) | 2021-03-26 | 2022-09-29 | Thyssenkrupp Industrial Solutions Ag | Device and method for the thermal treatment of a mineral feedstock |
| BE1029242B1 (en) * | 2021-03-26 | 2022-10-25 | Thyssenkrupp Ind Solutions Ag | Device and method for the thermal treatment of a mineral starting material |
| BE1029239B1 (en) * | 2021-03-26 | 2022-10-25 | Thyssenkrupp Ind Solutions Ag | Process for the thermal treatment of a mineral starting material |
| WO2022200232A1 (en) | 2021-03-26 | 2022-09-29 | Thyssenkrupp Industrial Solutions Ag | Device and method for the thermal treatment of a mineral feed material |
| EP4313898B1 (en) | 2021-03-26 | 2025-02-26 | thyssenkrupp Polysius GmbH | Method for the thermal treatment of a mineral feedstock |
| DE102021203071A1 (en) * | 2021-03-26 | 2022-09-29 | Thyssenkrupp Ag | Device and method for the thermal treatment of a mineral starting material |
| BE1029241B1 (en) * | 2021-03-26 | 2022-10-25 | Thyssenkrupp Ind Solutions Ag | Device and method for the thermal treatment of a mineral starting material |
| WO2022200221A1 (en) | 2021-03-26 | 2022-09-29 | Thyssenkrupp Industrial Solutions Ag | Device and method for the thermal treatment of a mineral feedstock |
| BE1029244B1 (en) * | 2021-03-26 | 2022-10-25 | Thyssenkrupp Ag | Device and method for the thermal treatment of a mineral starting material |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS526296B2 (en) * | 1972-08-31 | 1977-02-21 |
-
1986
- 1986-05-20 CS CS863651A patent/CS263617B1/en not_active IP Right Cessation
-
1987
- 1987-02-17 CN CN198787100767A patent/CN87100767A/en active Pending
- 1987-10-22 DE DE3735825A patent/DE3735825C2/en not_active Expired - Fee Related
- 1987-11-11 HU HU875024A patent/HU201145B/en not_active IP Right Cessation
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101984319A (en) * | 2010-12-08 | 2011-03-09 | 鞍山市华杰建材技术开发有限公司 | Energy-saving and efficiency-improvement double-temperature-field rotary kiln system |
| CN103105067A (en) * | 2013-03-06 | 2013-05-15 | 刘红锁 | Powdery material suspension type heat exchanger device and powdery material heat exchanger system |
| CN103105067B (en) * | 2013-03-06 | 2015-08-26 | 刘红锁 | Granular material suspension heat exchange device and granular material heat-exchange system |
| CN106111360A (en) * | 2016-06-21 | 2016-11-16 | 常熟理工学院 | Compound cyclone separator |
Also Published As
| Publication number | Publication date |
|---|---|
| CS263617B1 (en) | 1989-04-14 |
| HUT48975A (en) | 1989-07-28 |
| DE3735825A1 (en) | 1989-05-03 |
| HU201145B (en) | 1990-09-28 |
| DE3735825C2 (en) | 1997-10-16 |
| CS365186A1 (en) | 1988-09-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C01 | Deemed withdrawal of patent application (patent law 1993) | ||
| WD01 | Invention patent application deemed withdrawn after publication |