CN115321846A - Calcining method for separately using blast furnace gas in double-hearth lime kiln - Google Patents
Calcining method for separately using blast furnace gas in double-hearth lime kiln Download PDFInfo
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- CN115321846A CN115321846A CN202211111175.0A CN202211111175A CN115321846A CN 115321846 A CN115321846 A CN 115321846A CN 202211111175 A CN202211111175 A CN 202211111175A CN 115321846 A CN115321846 A CN 115321846A
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- 235000008733 Citrus aurantifolia Nutrition 0.000 title claims abstract description 66
- 235000011941 Tilia x europaea Nutrition 0.000 title claims abstract description 66
- 239000004571 lime Substances 0.000 title claims abstract description 66
- 238000001354 calcination Methods 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 title claims abstract description 29
- 239000007789 gas Substances 0.000 claims abstract description 128
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 75
- 239000001301 oxygen Substances 0.000 claims abstract description 75
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 75
- 238000002156 mixing Methods 0.000 claims abstract description 31
- 235000019738 Limestone Nutrition 0.000 claims abstract description 9
- 239000006028 limestone Substances 0.000 claims abstract description 9
- 238000002485 combustion reaction Methods 0.000 claims description 31
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 claims description 18
- 238000004519 manufacturing process Methods 0.000 claims description 11
- 238000001816 cooling Methods 0.000 claims description 8
- 229910001882 dioxygen Inorganic materials 0.000 claims description 6
- 238000005265 energy consumption Methods 0.000 claims description 6
- 230000009471 action Effects 0.000 claims description 5
- 238000007599 discharging Methods 0.000 claims description 4
- 239000007921 spray Substances 0.000 claims description 4
- 239000000446 fuel Substances 0.000 abstract description 6
- 230000008569 process Effects 0.000 description 8
- 239000002737 fuel gas Substances 0.000 description 6
- 239000003034 coal gas Substances 0.000 description 4
- 238000005520 cutting process Methods 0.000 description 4
- 239000002912 waste gas Substances 0.000 description 4
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000005338 heat storage Methods 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000003915 liquefied petroleum gas Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- JCXJVPUVTGWSNB-UHFFFAOYSA-N nitrogen dioxide Inorganic materials O=[N]=O JCXJVPUVTGWSNB-UHFFFAOYSA-N 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 238000011112 process operation Methods 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
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Classifications
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- 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
- C04B2/00—Lime, magnesia or dolomite
- C04B2/10—Preheating, burning calcining or cooling
- C04B2/12—Preheating, burning calcining or cooling in shaft or vertical furnaces
-
- 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
- C04B2/00—Lime, magnesia or dolomite
- C04B2/02—Lime
-
- 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
- C04B2/00—Lime, magnesia or dolomite
- C04B2/10—Preheating, burning calcining or cooling
- C04B2/108—Treatment or selection of the fuel therefor
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/40—Production or processing of lime, e.g. limestone regeneration of lime in pulp and sugar mills
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
The application provides a calcining method for singly using blast furnace gas in a double-hearth lime kiln, wherein the blast furnace gas is pressurized to 45-50KPa through a gas pressurizer, and the calorific value of the blast furnace gas is 800-950 Kcal/m 3 (ii) a Mixing air and oxygen-enriched gas to obtain combustion-supporting air, and pressurizing the combustion-supporting air to 35-40KPa by a combustion-supporting fan, wherein the oxygen content in the combustion-supporting air is 35% -65% by volume percentage; heat value C of mixed gas obtained by mixing combustion-supporting air and blast furnace gas Mixing of Is 650-700 Kcal/m 3 (ii) a In the calcining zone, combustion-supporting air and blast furnace gas are mixed and combusted to generate heat so as to thermally decompose limestone; after the oxygen-enriched gas and the air are mixed according to the proportion, the fuel concentration of the mixed gas of the combustion-supporting air and the blast furnace gas is improved, and the heat value C is improved Mixing of So that the double-hearth lime kiln can be independently used with low heat valueThe blast furnace gas of (1).
Description
Technical Field
The invention relates to the technical field of lime calcination in a double-hearth lime kiln, in particular to a calcination method for singly using blast furnace gas in the double-hearth lime kiln.
Background
The double-hearth lime kiln is a parallel flow and heat storage type double-hearth shaft kiln, is influenced by the process characteristics, has high heat utilization rate, and has the unit lime heat consumption of 800-900kcal/kg and the gas (fuel gas) pressure of 30-45KPa when a gas burning process is used.
In the prior art, the problem that a double-hearth lime kiln uses coal gas (fuel gas) for calcination is mainly that:
(1) Calcination using high calorific value gas (fuel gas) alone, with the technical drawbacks: high-calorific-value gas (fuel gas) is high in price, the high-calorific-value gas is rich in methane, hydrogen or hydrocarbons, the waste gas after combustion is rich in a large amount of water vapor, and the water vapor is condensed in a dust removal system to cause serious blockage of a bag dust removal system.
(2) The mixed combustion of high and low heat value gas (fuel gas) is used, and the technical defects are as follows: the heat value fluctuation of the mixed gas after mixing is large, even large-range heat value oscillation occurs, and the process operation is difficult.
(3) If the conventional calcination method is adopted, low heating value gas (< 1000 kcal/m) is used alone 3 ) The lime kiln is rich in a large amount of gases (nitrogen and carbon dioxide) which cannot participate in combustion, when the quality of lime is ensured, the input gases are too much, the system pressure is close to or exceeds the safety pressure, the exhaust volume is increased, the temperature of waste gases greatly exceeds the standard, and the yield and the quality of high-heat-value coal gas during calcination cannot be achieved.
Disclosure of Invention
The invention aims to provide a calcining method for singly using blast furnace gas in a double-hearth lime kiln.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
independent double-chamber lime kilnThe blast furnace gas is pressurized to 45-50KPa by a gas pressurizing machine, and the calorific value of the blast furnace gas is 800-950 Kcal/m 3 Blast furnace gas is sprayed into the kiln chamber through a spray gun;
mixing air and oxygen-enriched gas to obtain combustion-supporting air, and pressurizing the combustion-supporting air to 35-40KPa by a combustion-supporting fan, wherein the oxygen content in the combustion-supporting air is 35% -65% by volume percentage;
combustion-supporting air is blown into the kiln chamber from the top of the kiln chamber and flows downwards under the action of pressure difference; in the preheating zone, combustion-supporting air flows downwards and is preheated by limestone; in the calcining zone, combustion-supporting air and blast furnace gas are mixed and combusted to generate heat so as to thermally decompose limestone; the generated lime enters a cooling area, and the lime is discharged into a lower ash hopper through a disc ash discharging machine after being cooled by kiln bottom cooling air.
Preferably, the ratio of the combustion-supporting air to the blast furnace gas is as follows: calorific value C of mixed gas obtained by mixing combustion-supporting air and blast furnace gas Mixing of Is 650-700 Kcal/m 3 。
Preferably, the flow rate Q of the blast furnace gas Height of ：
Q Height of =C Theory of things Hourly set production of x lime ÷ C Height of X period time ÷ combustion given time;
C theory of things The theoretical energy consumption value of lime calcination is controlled to be 850Kcal/kg;
the hourly set yield of lime is the yield set according to production needs, and the unit is kg;
C height of Is the calorific value of blast furnace gas, which is obtained from the measured value of a calorific value meter in Kcal/m 3 ；
The unit of cycle time is seconds;
the unit of combustion given time is seconds.
Preferably, the flow rate Q of the combustion air Help with ：Q Help with =Q Height of ×C Height of ÷C Mixing of -Q Height of 。
Preferably, when the calorific value C of the blast furnace gas Height of Is 800Kcal/m 3 The volume percentage of the oxygen content in the combustion air was 63.3%.
It is preferable thatThe consumption amount of oxygen contained in the combustion air was controlled to 0.175m 3 Per kg lime;
oxygen content =0.175m in combustion air 3 Per kg lime x lime hourly production (kg) ÷ Q Help with 。
Preferably, the oxygen-enriched gas is industrial pure oxygen or adsorbed oxygen;
if commercially pure oxygen is used:
flow rate Q of oxygen-enriched gas Oxygen (O) =Q Help with X (oxygen content in combustion-supporting air-20.9%)/(100% -20.9%);
if adsorbed oxygen is used:
flow Q of oxygen-enriched gas Oxygen gas =Q Help with X (oxygen content in comburent air-20.9%)/(O) Suction device -20.9%）；
O Suction device The oxygen content of the adsorbed oxygen must not be lower than the oxygen content of the combustion air, as a volume percentage of the oxygen content of the adsorbed oxygen.
The application obtains the following beneficial technical effects:
(1) The fuel concentration of the mixed gas obtained by mixing the combustion-supporting air and the blast furnace gas is improved in a combustion-supporting air oxygen enrichment mode, so that the double-hearth lime kiln can independently use the blast furnace gas. The method takes the numerical values of pipeline pressure, gas heat value and temperature before the blast furnace gas enters a pressurizing machine, takes the oxygen content after the combustion-supporting air is enriched with oxygen, and calculates the flow of the required blast furnace gas through linkage with the heat consumption, the combustion time and the cycle time required by the double-hearth lime kiln process. The flow rate required by blast furnace gas is interlocked with the rotating speed of a gas pressurizing machine, the oxygen enrichment rate of combustion-supporting air is interlocked with the opening degree of a valve for producing oxygen by industrial pure oxygen or pressure swing adsorption and the rotating speed of the combustion-supporting air, and the rotating speed of the pressurizing machine is dynamically adjusted by a PLC control system, so that the heat value C of mixed gas obtained by mixing the combustion-supporting air and the blast furnace gas Mixing of Meets the requirements of the process, thereby solving the problem that blast furnace gas can not be used independently by adopting the traditional calcining way.
(2) The invention links the blast furnace gas heat value with the oxygen enrichment rate and the process parameters of the double-hearth lime kiln, and the heat value C of the mixed gas obtained by mixing the combustion-supporting air and the blast furnace gas Mixing of Stable and controllable calcining temperature, limeThe quality is stable.
(3) The normal operation of the double-hearth lime kiln is ensured by improving the fuel concentration of mixed gas obtained by mixing combustion-supporting air and blast furnace gas after mixing oxygen-enriched gas and air according to a certain proportion. The invention determines the minimum concentration of the fuel mixture and the minimum consumption of the total pure oxygen of the combustion-supporting air, and under the condition, the double-hearth lime kiln can meet the design productivity and quality requirements of high-heat-value fuel gas. The invention determines the direction and the principle of adjusting part of key parameters and ensures the performability of the process.
Drawings
FIG. 1 is a process flow diagram of a calcination method of a double-hearth lime kiln using blast furnace gas alone according to the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are a part of the embodiments of the present invention, but not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
The application provides a calcining method for singly using blast furnace gas in a double-hearth lime kiln, wherein the blast furnace gas is pressurized to 45-50KPa through a gas pressurizer, and the calorific value of the blast furnace gas is 800-950 Kcal/m 3 Blast furnace gas is sprayed into the kiln chamber through a spray gun;
mixing air and oxygen-enriched gas to obtain combustion-supporting air, and pressurizing the combustion-supporting air to 35-40KPa by a combustion-supporting fan, wherein the oxygen content in the combustion-supporting air is 35% -65% by volume percentage;
combustion-supporting air is blown into the kiln chamber from the top of the kiln chamber and flows downwards under the action of pressure difference; in the preheating zone, combustion-supporting air flows downwards and is preheated by limestone; in the calcining zone, combustion-supporting air and blast furnace gas are mixed and combusted to generate heat so as to thermally decompose limestone; the generated lime enters a cooling area, and is discharged into a lower ash bucket through a disc ash discharging machine after being cooled by kiln bottom cooling air.
In one embodiment of the present application, the ratio of the combustion-supporting air to the blast furnace gas is: heat value C of mixed gas obtained by mixing combustion-supporting air and blast furnace gas Mixing of Is 650-700 Kcal/m 3 。
In one embodiment of the present application, the flow rate Q of the blast furnace gas Height of ：
Q Height of =C Theory of things Hourly set production of x lime ÷ C Height of X cycle time ÷ burn given time;
C theory of things The theoretical energy consumption value of lime calcination is controlled to be 850Kcal/kg;
the hourly set yield of lime is the yield set according to production needs, and the unit is kg;
C height of Is the calorific value of blast furnace gas, which is obtained from the measured value of a calorific value meter in Kcal/m 3 ；
The unit of cycle time is seconds;
the unit of the given time of combustion is seconds.
In one embodiment of the present application, the flow rate Q of the combustion supporting air Help with ：Q Help with =Q Height of ×C Height of ÷C Mixing of -Q Height of 。
In one embodiment of the present application, when the heating value C of the blast furnace gas Height of Is 800Kcal/m 3 The volume percentage of the oxygen content in the combustion air was 63.3%.
In one embodiment of the present application, the consumption amount of oxygen contained in the combustion air is controlled to 0.175m 3 Per kg lime;
oxygen content =0.175m in combustion air 3 Kg lime x lime hourly production (kg) ÷ Q Help with 。
In one embodiment of the present application, the oxygen-enriched gas is industrially pure oxygen or adsorbed oxygen;
if industrially pure oxygen is used:
flow Q of oxygen-enriched gas Oxygen gas =Q Help with X (oxygen content in comburent air (volume percent) -20.9%)/100% -20.9%);
if adsorbed oxygen is used:
flow Q of oxygen-enriched gas Oxygen gas =Q Help with X (oxygen content in comburent air (volume percent) -20.9%) + (O) Suction device -20.9%）；
O Suction device The oxygen content of the adsorbed oxygen must not be lower than the oxygen content of the combustion air, as a volume percentage of the oxygen content of the adsorbed oxygen.
In this application, kcal/m 3 Cal in (1) is calorie unit, abbreviated as calorie, 1 kcal =1 kcal (kcal) =4.18 kilojoules (kJ), 1 kcal =4.18 joules (joules).
In the application, the quick-cut valve is a quick-cut valve which is one of execution mechanisms in an automatic system and is composed of a multi-spring pneumatic membrane execution mechanism or a floating typePiston actuating mechanismAnd withRegulating valveIs composed of a signal receiving and regulating meter, a controllerProcess pipelineThe internal fluid is cut off, connected or switched, has the characteristics of simple structure, sensitive response, reliable action and the like, and is widely applied toGas (es)、Natural gasAndliquefied petroleum gasAnd the like.
In the application, when the kiln is stopped or two hearts are reversed, the large backflow quick-cutting valve is opened, and the quick-cutting valve of the outlet main pipe of the coal gas pressurizer is closed; during combustion, the large reflux quick-cutting valve is closed, and the quick-cutting valve of the outlet main pipe of the coal gas pressurizer is opened.
In the application, the oxygen content in the waste gas of the double-hearth lime kiln is interlocked with the quick-cut valve of the oxygen enrichment system, and when the oxygen content in the waste gas is more than 23.5 percent, the quick-cut valve of the oxygen enrichment system is closed.
In the application, the hourly set yield of lime is the yield set according to production needs, the maximum yield does not exceed the rated yield, and the minimum yield is not less than 70% of the rated yield, and the unit is kg.
In the present application, cycle time: each reversing combustion of the double-hearth lime kiln is a period which comprises three sections of fuel setting time, burnout time and reversing time, wherein the unit is second;
combustion for a given time: the fuel setting time is equal to the cycle time minus the burnout time and the reversing time, the burnout time of a common gas burning kiln is 30 seconds, and the reversing time is 30 seconds.
In this application, the regulation principle:
(1) The consumption of the blast furnace gas is adjusted by taking the lime yield and the quality control as targets, and if the quality is excessive, the consumption of the blast furnace gas is reduced, otherwise, the consumption of the blast furnace gas is increased; increasing the yield increases the consumption of the blast furnace gas, otherwise, the consumption of the blast furnace gas is reduced; blast furnace gas consumption energy consumption C by adjusting theoretical unit lime calcination Theory of things The implementation is realized;
(2) In the actual control process, if the kiln pressure and the exhaust gas temperature are found to be too high, the content of the blast furnace gas in the mixed gas of the combustion-supporting air and the blast furnace gas needs to be increased, so that the C content is increased Mixing of On the contrary, the ratio of the combustion-supporting air to the blast furnace gas is reduced, and C is reduced Mixing of ；
(3) When the proportion of the combustion-supporting air and the blast furnace gas is adjusted, the oxygen content value in the combustion-supporting air needs to be adjusted at the same time, and the oxygen content in the combustion-supporting air is controlled to be not less than 0.175m 3 Per kg lime (Q) Help with X oxygen content in comburent air ÷ lime hour production).
The methods and devices not described in detail in the present invention are all the prior art and are not described in detail.
In order to further understand the present invention, the following examples are given to illustrate the calcination method of single blast furnace gas in a dual-hearth lime kiln according to the present invention, and the scope of the present invention is not limited by the following examples.
Example 1
The example is a double-hearth lime kiln with the rated capacity of 600t/D, and the heat value C of blast furnace gas High (a) Is 800Kcal/m 3 Flow rate of blast furnace gas Q High (a) Is 29900m 3 H, combustion air flow rate Q Help with Is 6900m 3 Per, pure oxygen flow rate is 3700m 3 H, theoretical energy consumption value C Theory of things 850Kcal/t lime, calorific value C of mixed gas Mixing of Is 650Kcal/m 3 。
A method for calcining blast furnace gas independently used by a double-hearth lime kiln comprises the steps of pressurizing the blast furnace gas to 45KPa through a gas pressurizing machine, wherein the calorific value of the blast furnace gas is 800Kcal/m 3 Blast furnace gas is sprayed into the kiln chamber through a spray gun;
mixing air and oxygen-enriched gas to obtain combustion-supporting air, and pressurizing the combustion-supporting air to 40KPa through a combustion-supporting fan, wherein the oxygen content in the combustion-supporting air is 63.3% by volume;
combustion-supporting air is blown into the kiln chamber from the top of the kiln chamber and flows downwards under the action of pressure difference; in the preheating zone, combustion-supporting air flows downwards and is preheated by limestone; in the calcining zone, combustion-supporting air and blast furnace gas are mixed and combusted to generate heat to thermally decompose limestone; the generated lime enters a cooling area, and is discharged into a lower ash bucket through a disc ash discharging machine after being cooled by kiln bottom cooling air;
the proportion of combustion-supporting air to blast furnace gas is as follows: heat value C of mixed gas obtained by mixing combustion-supporting air and blast furnace gas Mixing of Is 650Kcal/m 3 ；
Flow rate Q of blast furnace gas High (a) ：
Q Height of =C Theory of things X hours set yield ÷ C Height of X period time ÷ combustion given time;
C theory of things The theoretical energy consumption value of lime calcination is controlled to be 850Kcal/kg;
the hourly set yield of lime is 600 ÷ 24=25t =25000kg;
C high (a) The calorific value of the blast furnace gas is 800Kcal/kg;
cycle time is 900, units are seconds;
the combustion set time is 800 in seconds;
flow rate Q of combustion supporting air Help with ：Q Help with =Q High (a) ×C High (a) ÷C Mixing of -Q Height of ；
The total consumption of pure oxygen contained in the combustion-supporting air is controlled to be 0.175m 3 Per kg lime;
oxygen content =0.175m in combustion air 3 Per kg lime x lime hourly production (kg) ÷ Q Help with ；
The oxygen-enriched gas is industrial pure oxygen;
using commercially pure oxygen:
flow rate Q of oxygen-enriched gas Oxygen gas =Q Help with X (oxygen content in comburent air-20.9%)/(100% -20.9%).
The above description of the embodiments is only intended to facilitate the understanding of the method of the invention and its core idea. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, it is possible to make various improvements and modifications to the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (7)
1. A calcining method for using blast furnace gas independently in a double-hearth lime kiln is characterized in that the blast furnace gas is pressurized to 45-50KPa by a gas pressurizer, and the calorific value of the blast furnace gas is 800-950 Kcal/m 3 Blast furnace gas is sprayed into the kiln chamber through a spray gun;
mixing air and oxygen-enriched gas to obtain combustion-supporting air, and pressurizing the combustion-supporting air to 35-40KPa through a combustion-supporting fan, wherein the oxygen content in the combustion-supporting air is 35-65% by volume;
combustion-supporting air is blown into the kiln chamber from the top of the kiln chamber and flows downwards under the action of pressure difference; in the preheating zone, combustion-supporting air flows downwards and is preheated by limestone; in the calcining zone, combustion-supporting air and blast furnace gas are mixed and combusted to generate heat so as to thermally decompose limestone; the generated lime enters a cooling area, and is discharged into a lower ash bucket through a disc ash discharging machine after being cooled by kiln bottom cooling air.
2. The calcining method of blast furnace gas for the double-hearth limekiln, which is claimed in claim 1, is characterized in that the proportion of combustion-supporting air to blast furnace gas is as follows: heat value C of mixed gas obtained by mixing combustion-supporting air and blast furnace gas Mixing of Is 650-700 Kcal/m 3 。
3. The method for calcining blast furnace gas by using the double-hearth lime kiln independently as claimed in claim 1, wherein the flow rate Q of the blast furnace gas is High (a) ：
Q High (a) =C Theory of things Hourly set yield of x lime ÷ C High (a) X cycle time ÷ burn given time;
C theory of things The theoretical energy consumption value of lime calcination is controlled to be 850Kcal/kg;
the hourly set yield of lime is the yield set according to production needs, and the unit is kg;
C high (a) Is the calorific value of blast furnace gas, which is obtained from the measured value of a calorific value meter in Kcal/m 3 ；
The unit of cycle time is seconds;
the unit of combustion given time is seconds.
4. The method for calcining blast furnace gas alone in a double-hearth lime kiln as claimed in claim 1, wherein the flow rate Q of combustion air Help with ：Q Help with =Q High (a) ×C High (a) ÷C Mixing of -Q Height of 。
5. The method for calcining the blast furnace gas by using the double-hearth lime kiln as the claim 1, wherein the calorific value C of the blast furnace gas is Height of Is 800Kcal/m 3 The volume percentage of the oxygen content in the combustion air was 63.3%.
6. The method for calcining the blast furnace gas alone in the double-hearth lime kiln as claimed in claim 1, wherein the consumption amount of the oxygen contained in the combustion air is controlled to 0.175m 3 Per kg lime;
oxygen content =0.175m in combustion air 3 Per kg lime x lime hourly production (kg) ÷ Q Help with 。
7. The calcination method of blast furnace gas solely used by a double-hearth lime kiln according to claim 6, wherein the oxygen-rich gas is industrially pure oxygen or adsorbed oxygen;
if industrially pure oxygen is used:
flow rate Q of oxygen-enriched gas Oxygen gas =Q Help with X (oxygen content in comburent air-20.9%)/100% -20.9%);
if adsorbed oxygen is used:
flow rate Q of oxygen-enriched gas Oxygen gas =Q Help with X (oxygen content in combustion-supporting air-20.9%)÷（O Suction device -20.9%）；
O Suction device The oxygen content of the adsorbed oxygen must not be lower than the oxygen content of the combustion air as a percentage by volume of the oxygen content of the adsorbed oxygen.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211111175.0A CN115321846A (en) | 2022-09-13 | 2022-09-13 | Calcining method for separately using blast furnace gas in double-hearth lime kiln |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211111175.0A CN115321846A (en) | 2022-09-13 | 2022-09-13 | Calcining method for separately using blast furnace gas in double-hearth lime kiln |
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| CN115321846A true CN115321846A (en) | 2022-11-11 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115849737A (en) * | 2022-12-28 | 2023-03-28 | 包头钢铁（集团）有限责任公司 | Macez kiln calcining method for high-powder-surface-rate lime |
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| WO2005059461A1 (en) * | 2003-12-16 | 2005-06-30 | Rheinkalk Gmbh | Limestone calcination method |
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| CN109141015A (en) * | 2017-06-15 | 2019-01-04 | 宝钢工程技术集团有限公司 | Double-hearth lime kiln two close cycles temperature control equipment and its application method |
| CN113582560A (en) * | 2021-07-10 | 2021-11-02 | 石家庄新华能源环保科技股份有限公司 | Method for calcining limestone by using low-calorific-value fuel in double-hearth kiln |
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| WO2005059461A1 (en) * | 2003-12-16 | 2005-06-30 | Rheinkalk Gmbh | Limestone calcination method |
| CN1931766A (en) * | 2006-09-27 | 2007-03-21 | 中冶焦耐工程技术有限公司 | Low heat value gas oxygen-enriched burning process in rotary lime kiln |
| CN107021652A (en) * | 2017-06-05 | 2017-08-08 | 宝钢工程技术集团有限公司 | A kind of pair of thorax cocurrent heat accumulating type lime shaft kiln method for calcinating |
| CN109141015A (en) * | 2017-06-15 | 2019-01-04 | 宝钢工程技术集团有限公司 | Double-hearth lime kiln two close cycles temperature control equipment and its application method |
| CN113582560A (en) * | 2021-07-10 | 2021-11-02 | 石家庄新华能源环保科技股份有限公司 | Method for calcining limestone by using low-calorific-value fuel in double-hearth kiln |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115849737A (en) * | 2022-12-28 | 2023-03-28 | 包头钢铁（集团）有限责任公司 | Macez kiln calcining method for high-powder-surface-rate lime |
| CN115849737B (en) * | 2022-12-28 | 2024-03-08 | 包头钢铁（集团）有限责任公司 | Maerz kiln calcination method for high powder surface rate lime |
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