CN114315179A - Process for producing active lime - Google Patents
Process for producing active lime Download PDFInfo
- Publication number
- CN114315179A CN114315179A CN202210066356.XA CN202210066356A CN114315179A CN 114315179 A CN114315179 A CN 114315179A CN 202210066356 A CN202210066356 A CN 202210066356A CN 114315179 A CN114315179 A CN 114315179A
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- Prior art keywords
- lime
- decomposer
- heat exchange
- rotary kiln
- powder
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- 235000008733 Citrus aurantifolia Nutrition 0.000 title claims abstract description 89
- 235000011941 Tilia x europaea Nutrition 0.000 title claims abstract description 89
- 239000004571 lime Substances 0.000 title claims abstract description 89
- 238000000034 method Methods 0.000 title claims abstract description 31
- 239000000843 powder Substances 0.000 claims abstract description 42
- 235000019738 Limestone Nutrition 0.000 claims abstract description 25
- 239000006028 limestone Substances 0.000 claims abstract description 25
- 238000004519 manufacturing process Methods 0.000 claims abstract description 20
- 238000001354 calcination Methods 0.000 claims abstract description 18
- 238000000227 grinding Methods 0.000 claims abstract description 7
- 239000002699 waste material Substances 0.000 claims description 21
- 238000002485 combustion reaction Methods 0.000 claims description 12
- 239000002994 raw material Substances 0.000 claims description 9
- 239000004575 stone Substances 0.000 claims description 8
- 239000003245 coal Substances 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 5
- 239000002737 fuel gas Substances 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 5
- 239000000428 dust Substances 0.000 claims description 4
- 230000005611 electricity Effects 0.000 claims description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 3
- 239000011449 brick Substances 0.000 claims description 3
- 238000005485 electric heating Methods 0.000 claims description 3
- 239000012774 insulation material Substances 0.000 claims description 3
- 229910052760 oxygen Inorganic materials 0.000 claims description 3
- 239000001301 oxygen Substances 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 3
- 206010003497 Asphyxia Diseases 0.000 claims description 2
- 239000007789 gas Substances 0.000 claims description 2
- 238000000354 decomposition reaction Methods 0.000 description 4
- 241000209094 Oryza Species 0.000 description 3
- 235000007164 Oryza sativa Nutrition 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 235000009566 rice Nutrition 0.000 description 3
- 239000004568 cement Substances 0.000 description 2
- 239000000571 coke Substances 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 238000012827 research and development Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 235000021028 berry Nutrition 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- 235000011116 calcium hydroxide Nutrition 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
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- Muffle Furnaces And Rotary Kilns (AREA)
- Furnace Details (AREA)
Abstract
The invention relates to a process for producing active lime, which comprises the steps of powdering limestone, and forming a continuous calcining process by a preheater, a decomposer and a lime heat exchange rotary kiln, wherein the generated lime powder is completely cured, and the result is incomparable to the traditional equipment and production process.
Description
Technical Field
The invention relates to a process for producing active lime by technical means of arranging more than two combustion chambers and a lime heat exchange rotary kiln in a combustion unit consisting of a mill, a preheater and an external kiln decomposer.
Background
The lime production industry in China has changed greatly, and rotary kilns of Claus Marfil Germany, Mitsubishi Japan and American & Ozel company, double-chamber shaft kilns of Meerz Switzerland, sleeve kilns of Probecenbach Germany, double-beam kilns and 'beam bridge' sleeve kilns of Fraca Italy, double 'D' kilns of Simm Italy, suspension kilns of Berry Germany, beam kilns of Florida Italy and coke kilns of Sumitomo Japan are introduced in many times. In the introduction, the rotary kiln, the double-chamber shaft kiln, the sleeve kiln, the beam kiln, the lime shaft kiln, the novel coke lime shaft kiln, the medium-stone shaft kiln, the Marfan kiln and the like developed in China have the advantages that the predecomposition rate of limestone is 20-25%, the maximum predecomposition rate is 30%, the heat consumption is not less than 1100Kcal/kg. CaO, and the optimal raw material granularity is 15-45 mm. But the defects of large occupied area, large dust, high heat consumption and no guarantee on lime quality are overcome, and the problems of low carbon, environmental protection and the like in the active lime production industry of China along with the high-speed development of national economy are the problems which need to be solved in the technical field of the production of the active lime by the rotary kiln of the mechanical shaft kiln.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a process method for producing active lime, and the problems of low pre-decomposition rate of limestone, low utilization rate of coal and gas, electric heating and high heat consumption in the production of active lime are solved by the method.
Therefore, the technical scheme for solving the problems is a process method for producing active lime, which comprises the following steps: the method comprises the following steps:
(1) and crushing the raw material limestone with the diameter of more than 20mm to crushed stone with the diameter of 5-10mm by a crusher.
(2) And (2) grinding the crushed stone obtained in the step (1) into limestone powder with a particle size of less than 3mm by a grinding machine, and warehousing.
(3) And (3) after the limestone powder obtained in the step (2) is subjected to bag-type dust removal, the limestone powder is input into a preheater with the height of more than or equal to 20m and more than two calcining intervals through a storage bin for preheating.
(4) The heat energy is provided for the preheater and the kiln outer decomposer by heating coal, fuel gas and electricity, the limestone powder in the preheater is subjected to primary calcination and is decomposed in the kiln outer decomposer.
(5) And the decomposed lime powder passes through a U-shaped downward pipeline of the decomposer to obtain high-temperature lime powder, and the high-temperature lime powder flows into the preheater and then flows into the feeding hole of the lime heat exchange rotary kiln.
(6) And obtaining high-temperature lime powder through a lime heat exchange rotary kiln, and obtaining high-quality lime powder through a lime heat exchange rotary kiln discharge port after heat exchange.
Preferably, more than two combustion chambers are arranged in a combustion unit formed by the preheater and the kiln outer decomposer.
The bottom of the preferable decomposer is connected with a waste discharge pipeline, the waste discharge pipeline is connected with a hot air outlet pipeline of a feed inlet of the lime heat exchange rotary kiln, and the obtained hot air supplies oxygen to the decomposer for burning coal powder, fuel gas and electrically heating and calcining lime powder.
The bottom of the preferable decomposer is connected with a waste discharge pipeline, the waste discharge pipeline is connected with a waste metering bin, the waste metering bin is connected with an intelligent central control room of the lime production process, the intelligent central control room monitors the inner cavity of the preheater in real time, and the heat insulation material, the refractory bricks and the castable in the inner cavity of the decomposer fall off. The undecomposed limestone raw material in the inner cavity of the decomposer is discharged from a waste discharge pipeline at the bottom of the decomposer and flows into a waste metering bin, so that the quality of lime is ensured;
preferably, the preheater has more than two calcining sections, each of which is formed separately and is independent of each other and connected with each other through a pipeline;
preferably, the fixed disks of the tubes are fixed on two sides of the inner wall of the lime heat exchange rotary kiln;
preferably, the inner cavity wall of the lime heat exchange rotary kiln is provided with a fireproof heat preservation function;
preferably, the inner cavity wall of the lime heat exchange rotary kiln is provided with more than two raised shoveling plates.
Preferably, more than two tube plates are arranged in the inner cavity of the lime heat exchange rotary kiln;
preferably, more than two cooling pipes are arranged in the inner cavity of the lime heat exchange rotary kiln;
preferably, more than two cooling pipes are arranged in the inner cavity of the vertical heat exchanger;
compared with the prior art, the method has the advantages that the raw material limestone is powdered firstly, so that the raw material entering the preheater does not appear in the shape of stone blocks any more, the completely slaked lime powder generated in the continuous calcining process consisting of the continuous calcining process comprising the continuous calcining process and the lime heat exchange rotary kiln and the combustion unit consisting of the preheater and the kiln outer decomposer is incomparable with the traditional equipment and the production process in the subsequent primary calcining and slaking calcining stages, and the heat insulation performance of the lime heat exchange rotary kiln is superior to that of the conventional technology due to the heat insulation layer structure and the raised material sheet structure on the surface of the inner cavity of the lime heat exchange rotary kiln.
FIG. 1 is a schematic flow diagram of a process for producing activated lime according to the present invention.
Detailed Description
Before the embodiment of the invention is developed, it is necessary to analyze the traditional lime powder calcining process, calcine the limestone powder in the past or even at present, and adopt novel dry-pollution cement, and a combustion kiln is arranged at the bottom of a kiln outside a decomposing furnace, namely, a novel dry-method cement system adopts 'kiln tail and fire' to improve the decomposition temperature and exchange flue gas, so that the heat energy utilization rate is low, the heat consumption is high, and the limestone powder decomposition rate is low.
The process method for producing the active lime comprises the following steps:
(1) and crushing the raw material limestone with the diameter of more than 20mm to crushed stone with the diameter of 5-10mm by a crusher.
(2) And (2) grinding the crushed stone obtained in the step (1) into limestone powder with a particle size of less than 3mm by a grinding machine, and warehousing.
(3) And (3) after the limestone powder obtained in the step (2) is subjected to bag-type dust removal, the limestone powder is input into a preheater with the height of more than or equal to 20m and more than two calcining intervals through a storage bin for preheating.
(4) The heat energy is provided for the preheater and the kiln outer decomposer by heating coal, fuel gas and electricity, the limestone powder in the preheater is subjected to primary calcination and is decomposed in the kiln outer decomposer.
(5) And the decomposed lime powder passes through a U-shaped downward pipeline of the decomposer to obtain high-temperature lime powder, and the high-temperature lime powder flows into the preheater and then flows into the feeding hole of the lime heat exchange rotary kiln.
(6) And obtaining high-temperature lime powder at a feed inlet of the lime heat exchange rotary kiln, and obtaining high-quality lime powder from a discharge outlet of the lime heat exchange rotary kiln after heat exchange through the lime heat exchange rotary kiln.
The method is characterized in that: the waste discharge pipeline is connected with the bottom of the decomposer and is connected with the waste metering bin, the waste metering bin is connected with the intelligent central control room of the lime production process, the inner cavity of the preheater is monitored in real time by the intelligent central control room, and the heat insulation material, the refractory bricks and the castable in the inner cavity of the decomposer fall off. The undecomposed limestone raw material in the inner cavity of the decomposer is discharged from a waste discharge pipeline at the bottom of the decomposer and flows into a waste metering bin, so that the quality of lime is ensured;
the method is characterized in that: the preheater and the decomposer form a combustion unit, a plurality of combustion asphyxia are arranged, the electric rice cooker produced abroad a few years ago is heated at multiple points, rice made by heating at one point at the bottom is delicious and saves electricity compared with the traditional electric rice cooker, the inventor practices the combustion unit formed by the preheater and the decomposer outside the kiln through research and development, a plurality of combustion chambers are arranged, calcined lime powder is more easily burned than the bottom of the traditional decomposer, the decomposition rate of limestone is greatly improved by calcining the lime powder, and the heat energy is saved for the first time.
The method is characterized in that: according to the lime heat exchange rotary kiln, through years of research and development practices, raised material breaking equipment, material stirring equipment, vibration equipment and lime heat exchange rotary kiln self-transmission are arranged in an inner cavity of the lime heat exchange rotary kiln, the problem of inertia of lime powder at 900-600 ℃ is solved, the effect that the lime powder with high temperature of about 900 ℃ exchanges heat with a plurality of cooling pipes in the inner cavity of the lime heat exchange rotary kiln to obtain hot air with the temperature of more than 400 ℃ is achieved, the hot air outlet pipeline of a feed inlet of the lime heat exchange rotary kiln is connected with a waste discharge pipeline at the bottom of a decomposer, and the obtained hot air with the temperature of more than 400 ℃ supplies oxygen to the coal-fired decomposer, fuel gas and electric heating calcined lime powder, and the process for producing lime powder saves heat for the second time by more than 30% compared with the existing process for producing lime powder.
Claims (10)
1. A process for producing active lime comprises the following steps:
(1) and crushing the raw material limestone with the diameter of more than 20mm to crushed stone with the diameter of 5-10mm by a crusher.
(2) And (2) grinding the crushed stone obtained in the step (1) into limestone powder with a particle size of less than 3mm by a grinding machine, and warehousing.
(3) And (3) after the limestone powder obtained in the step (2) is subjected to bag-type dust removal, the limestone powder is input into a preheater with the height of more than or equal to 20m and more than two calcining intervals through a storage bin for preheating.
(4) The heat energy is provided for the preheater and the kiln outer decomposer by heating coal, fuel gas and electricity, the limestone powder in the preheater is subjected to primary calcination and is decomposed in the kiln outer decomposer.
(5) And the decomposed lime powder passes through a U-shaped downward pipeline of the decomposer to obtain high-temperature lime powder, and the high-temperature lime powder flows into the preheater and then flows into the feeding hole of the lime heat exchange rotary kiln.
(6) And obtaining high-temperature lime powder at a feed inlet of the lime heat exchange rotary kiln, and obtaining high-quality lime powder from a discharge outlet of the lime heat exchange rotary kiln after heat exchange through the lime heat exchange rotary kiln.
2. According to claim 1: the process method for producing the active lime is characterized in that more than two combustion asphyxia are arranged in a combustion unit formed by the preheater and the kiln outer decomposer.
3. According to claim 1: the process method for producing the active lime is characterized in that more than two calcining intervals are arranged in the preheater, and each calcining interval is formed independently and is mutually independent and connected with each other through a pipeline.
4. According to claim 1: the bottom of the decomposer is connected with a waste discharge pipeline, the waste discharge pipeline is connected with a waste metering bin, the waste metering bin is connected with an intelligent central control room of the lime production process, the intelligent central control room monitors the inner cavity of the preheater in real time, and the heat insulation material, the refractory bricks and the castable in the inner cavity of the decomposer fall off. And the undecomposed limestone raw material in the inner cavity of the decomposer is discharged from a waste discharge pipeline at the bottom of the decomposer and flows into a waste metering bin, so that the quality of lime is ensured.
5. According to claim 1: the process method for producing the active lime is characterized in that a waste discharge pipeline is connected to the bottom of the decomposer and connected with a hot air outlet pipeline of a feed inlet of the lime heat exchange rotary kiln, and the obtained hot air provides oxygen for coal, gas and electric heating calcined lime powder of the decomposer.
6. According to claim 1: the process method for producing the active lime is characterized in that fixed discs of tubes are fixed on two sides of the inner wall of the lime heat exchange rotary kiln.
7. According to claim 1: the process method for producing the active lime is characterized in that the inner cavity wall of the lime heat exchange rotary kiln is fireproof and heat-insulating.
8. According to claim 1: the process method for producing the active lime is characterized in that more than two raised shoveling plates are arranged on the inner cavity wall of the lime heat exchange rotary kiln.
9. According to claim 1: the process method for producing the active lime is characterized in that more than two cooling pipes are arranged in the inner cavity of the lime heat exchange rotary kiln.
10. According to claim 1: the process method for producing the active lime is characterized in that more than two cooling pipes are arranged in the inner cavity of the lime vertical heat exchanger.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111558387 | 2021-12-20 | ||
| CN2021115583879 | 2021-12-20 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114315179A true CN114315179A (en) | 2022-04-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210066356.XA Pending CN114315179A (en) | 2021-12-20 | 2022-01-20 | Process for producing active lime |
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| Country | Link |
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| CN (1) | CN114315179A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203558976U (en) * | 2013-11-06 | 2014-04-23 | 米长山 | Preheater for producing active lime |
| CN203558974U (en) * | 2013-11-05 | 2014-04-23 | 米长山 | Rotary kiln for producing active lime |
| CN103880302A (en) * | 2014-02-21 | 2014-06-25 | 米长山 | Technique method for producing active lime |
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2022
- 2022-01-20 CN CN202210066356.XA patent/CN114315179A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203558974U (en) * | 2013-11-05 | 2014-04-23 | 米长山 | Rotary kiln for producing active lime |
| CN203558976U (en) * | 2013-11-06 | 2014-04-23 | 米长山 | Preheater for producing active lime |
| CN103880302A (en) * | 2014-02-21 | 2014-06-25 | 米长山 | Technique method for producing active lime |
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Application publication date: 20220412 |
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