CN107226627B - Active powder lime second grade suspension calcining device - Google Patents
Active powder lime second grade suspension calcining device Download PDFInfo
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- CN107226627B CN107226627B CN201710556110.XA CN201710556110A CN107226627B CN 107226627 B CN107226627 B CN 107226627B CN 201710556110 A CN201710556110 A CN 201710556110A CN 107226627 B CN107226627 B CN 107226627B
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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
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- 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
Abstract
The invention discloses a secondary suspension calcining device for active powder lime, which is suitable for calcining limestone fine powder (the fineness R is 0.08 minus sieve 5 to 25%) with the moisture content of less than 1% into active lime and comprises a primary suspension calcining furnace, a primary cyclone separator, a secondary suspension calcining furnace, a secondary cyclone separator, a multi-stage suspension preheater, a multi-stage suspension cooler and the like, wherein the whole processes of preheating, decomposing and cooling the limestone powder are completed in a suspension state, so that the product quality is effectively improved and stabilized, and the production energy consumption is reduced. The method is characterized in that the powdered lime fired by the primary suspension calciner is collected by the primary cyclone separator and then enters the secondary suspension calciner for decomposition, and the content of active calcium oxide in the finished product of powdered lime is further improved.
Description
Technical Field
The invention relates to the field of lime production devices, in particular to a secondary suspension calcining device for active powder lime.
Background
The active lime is a basic raw material in the steel industry, and is also widely used in industries such as calcium carbide, electric power, glass fiber, building materials, paper making, sewage treatment and the like, the annual consumption is nearly billion tons, wherein the steel industry and the calcium carbide industry mainly use massive materials, and the industries such as electric power desulfurization, glass fiber, building materials, paper making, sewage treatment and the like mainly use powdery materials.
At present, lime is mainly obtained by calcining massive limestone, production enterprises are small and scattered, and the technology is laggard and the environment is poor. The conventional limestone calcining apparatus is as follows:
| calcining device | Feeding shape | Heat loss (kcal/kg) | Remarks for note |
| Common shaft kiln | Block 50-300mm | 900-1300 | |
| Mechanical shaft kiln | Block shape of 40-80mm | 1000-1300 | |
| Beam type lime kiln | Block 40-80mm | 900-1050 | |
| Double-chamber kiln | Block 30-80mm | 900-1050 | The single machine can reach 600t/d |
| Sleeve kiln | Block shape 50-90mm | 900-1050 | |
| Hollow rotary kiln | Block 20-60mm | 1400-1800 | |
| Vertical preheater rotary kiln | Block shape 10-50mm | 1150-1600 | The single machine can reach 1000t/d |
As the blocky limestone is calcined, the device has low heat exchange efficiency, high calcining heat consumption, difficult guarantee of product quality and uniformity, and phenomena of overburning appearance and underburning inner core and the like in different degrees.
At present, the powdery lime is obtained by selecting, crushing and grinding blocky lime, but the blocky lime is far poorer in grindability than limestone and high in grinding power consumption. With the increasing demand of the powdered lime, especially the greater demand of the high-quality (the content of active calcium is more than 90 percent) powdered lime, the search for green, energy-saving and environment-friendly powdered lime calcining devices is more urgent.
The invention aims to provide a secondary suspension calcining device for active powdered lime, so that the production process of the powdered lime is changed from calcining massive limestone to grinding the massive limestone into powder to grinding the massive limestone to powdery suspension, preheating, calcining and cooling, the energy consumption in the production process of the powdered lime is reduced, and the product quality is improved and stabilized.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the utility model provides an active powder lime second grade suspension calcining device which characterized in that: the device comprises a multistage suspension preheater, a first-stage suspension calciner, a first-stage cyclone separator, a second-stage suspension calciner, a second-stage cyclone separator, a multistage suspension cooler and a fluidization cooler, wherein:
limestone powder serving as a raw material enters the multistage suspension preheater from the upper end of the multistage suspension preheater, the lower end of the multistage suspension preheater is communicated with a limestone powder inlet at the side part of the primary suspension calciner through a discharge pipe, and the limestone powder enters the primary suspension calciner through the discharge pipe after being preheated by the multistage suspension preheater;
the side part of the primary suspension calciner is provided with a fuel inlet for introducing fuel, a combustion air inlet for introducing combustion air, and a waste gas inlet, the upper end of the primary suspension calciner is communicated with the top of the primary cyclone separator through a primary gooseneck pipe, the lower end of the primary suspension calciner is communicated with the fluidization cooler through an ash discharge pipe, preheated limestone powder enters the primary suspension calciner through the limestone powder inlet, the limestone powder is calcined in the primary suspension calciner under the combustion air environment by using the fuel, powdery lime and waste gas obtained preliminarily after calcination enter the primary cyclone separator through the primary gooseneck pipe, and blanking formed in abnormal calcination enters the fluidization cooler through the ash discharge pipe;
the upper end of the primary cyclone separator is provided with a waste gas outlet which is communicated with the lower end of the multistage suspension preheater, the lower end of the primary cyclone separator is communicated with a powdered lime inlet at the side part of the secondary suspension calciner through a discharging pipe, the primary cyclone separator separates the waste gas from the primarily obtained powdered lime, wherein the waste gas is recycled to the multistage suspension preheater through the waste gas outlet, the waste gas is used for preheating the powdered lime in the multistage suspension preheater, and the powdered lime separated by the primary cyclone separator is led to the secondary suspension calciner through the discharging pipe;
the side part of the secondary suspension calciner is provided with a fuel inlet for feeding fuel and a combustion air inlet for feeding combustion air, the side part of the secondary suspension calciner is also provided with an exhaust inlet, the lower end of the secondary suspension calciner is communicated with a fluidization cooler through an ash discharge pipe, one side of the upper end of the secondary suspension calciner is communicated with one side of a secondary cyclone separator, the lime powder separated by the primary cyclone separator enters the secondary suspension calciner through a lime powder inlet, the lime powder is calcined in the secondary suspension calciner under the combustion air environment by using the fuel, the fluidized lime powder and waste gas obtained after calcination are led to the secondary cyclone separator, and blanking formed when the calcination is abnormal enters the cooler through the ash discharge pipe;
the upper end of the secondary cyclone separator is provided with a waste gas outlet which is communicated with a waste gas inlet of the primary suspension calciner, the lower end of the secondary cyclone separator is communicated with the upper end of the multi-stage suspension cooler through a discharging pipe, the waste gas and finished powder lime are separated by the secondary cyclone separator, wherein the waste gas is recycled through the waste gas outlet and is led to the primary suspension calciner, the waste gas is used for providing heat assistance for calcining the limestone powder in the primary suspension calciner, and the finished powder lime separated by the secondary cyclone separator is led to the multi-stage suspension cooler through the discharging pipe;
the upper end of the multistage suspension cooler is provided with a high-temperature air outlet, the lower end of the multistage suspension cooler is provided with a pulverized lime discharge pipe and an air inlet pipe, the high-temperature air outlet of the multistage suspension cooler is respectively communicated with a combustion air inlet of the primary suspension calciner and a combustion air inlet of the secondary suspension calciner through a high-temperature fan and a combustion air pipeline, the air inlet pipe of the multistage suspension cooler is filled with air through a fan, the air cools the finished pulverized lime in the multistage suspension cooler, the cooled finished pulverized lime is discharged through a pulverized lime discharge pipe, the air and the finished pulverized lime form high-temperature air as combustion air after heat exchange, and the combustion air is respectively led to the primary suspension calciner and the secondary suspension calciner through the high-temperature fan;
air is introduced into the fluidization cooler through a fan, one end of the fluidization cooler is provided with a blanking outlet, the fluidization cooler is also provided with an exhaust outlet, the exhaust outlet on the fluidization cooler is communicated with an exhaust inlet of the secondary suspension calciner, blanking formed when the primary suspension calciner and the secondary suspension calciner are abnormally combusted respectively enters the fluidization cooler, the blanking is discharged through the blanking outlet after the heat exchange and the cooling with the air in the fluidization cooler, high-temperature air formed after the heat exchange is recycled to the secondary suspension calciner through the exhaust outlet, and the high-temperature air is used for providing heat for calcining powdered lime in the secondary suspension calciner.
The active powder lime two-stage suspension calcining device is characterized in that: the primary suspension calciner comprises: the upper end of the primary cylinder is communicated with the top of the primary cyclone separator through a primary gooseneck pipe, the lower end of the primary cylinder is communicated with the upper end of the primary air inlet chamber through the primary cone and the primary necking pipe in sequence, and the lower end of the primary air inlet chamber is communicated with the fluidized cooler through an ash discharge pipe;
one side of the lower part of the primary cylinder is provided with a limestone powder inlet, and the limestone powder enters the primary cylinder in a downward radial direction through the limestone powder inlet;
the side part of the primary cone is provided with a combustion air inlet, and the combustion air inlet enables combustion air to horizontally or downwards cut into the primary cone; the side part of the primary cone is positioned at the front upper part and the front upper part of the combustion air inlet, and is oppositely provided with a fuel inlet, the two fuel inlets are opposite, and the fuel enters the primary cone in a downward cutting direction through the fuel inlets;
one side of the upper part of the first-stage air inlet chamber is provided with a waste gas inlet.
The active powder lime secondary suspension calcining device is characterized in that: a material dispersing device is arranged in the limestone powder inlet.
The active powder lime secondary suspension calcining device is characterized in that: the secondary suspension calcining furnace comprises: the device comprises a secondary air inlet chamber, a secondary necking, a secondary cone and a secondary cylinder, wherein one side of the upper end of the secondary cylinder is communicated with one side of a secondary cyclone separator through an outlet, the lower end of the secondary cylinder is communicated with the upper end of the secondary air inlet chamber through the secondary cone and the secondary necking in sequence, and the lower end of the secondary air inlet chamber is communicated with a fluidized cooler through an ash discharge pipe;
a powder lime inlet is formed in one side of the lower portion of the secondary cylinder, and the powder lime inlet enables the powder lime to enter the secondary cylinder in a downward radial direction;
the side part of the secondary cone is provided with a combustion air inlet, and the combustion air inlet enables combustion air to horizontally or downwards cut into the secondary cone; the side part of the secondary cone is positioned at the front upper part and the front upper part of the combustion air inlet, and is oppositely provided with a fuel inlet, the two fuel inlets are opposite, and the fuel enters the secondary cone in a downward cutting direction;
the side part of the secondary air inlet chamber is provided with a combustion air inlet, and the combustion air inlet enables combustion air to enter the secondary air inlet chamber downwards or horizontally or radially; the side part of the secondary air inlet chamber is also provided with an exhaust inlet and an ignition auxiliary fuel inlet, wherein the ignition auxiliary fuel inlet enables the ignition auxiliary fuel to be cut downwards to enter the secondary air inlet chamber.
The active powder lime two-stage suspension calcining device is characterized in that: a material dispersing device is arranged in the lime powder inlet.
The active powder lime two-stage suspension calcining device is characterized in that: the primary cyclone separator can be single or two parallel. The corresponding multi-stage suspension preheater is in a single row or two parallel rows.
The active powder lime two-stage suspension calcining device is characterized in that: the secondary cyclone can be single or two parallel. The corresponding multi-stage suspension coolers are in single-row or two-row parallel.
The active powder lime two-stage suspension calcining device is characterized in that: a plurality of middle necking ports are arranged in the primary column body of the primary suspension calcining furnace at different heights, and a plurality of middle necking ports are arranged in the secondary column body of the secondary suspension calcining furnace at different heights.
Lime production has three important links: the key point is to improve the decomposition rate of calcium carbonate calcined by limestone, and the decomposition rate needs to be more than 95 percent to meet the requirements of high-end users.
The invention designs a secondary suspension calcining device for active powdered lime, which comprises a secondary suspension calcining furnace which is arranged in series, wherein the powdered lime calcined by the primary suspension calcining furnace enters the secondary suspension calcining furnace for recondecomposition after being collected by a primary cyclone separator, the powdered lime calcined by the secondary suspension calcining furnace is collected by the secondary cyclone separator and then is used as finished powdered lime, and the waste gas at the outlet of the secondary cyclone separator enters the primary suspension calcining furnace. The secondary suspension calciner is initially in a pure air environment, wherein the partial pressure of carbon dioxide is lower than that of smoke, and the partial pressure of oxygen is higher than that of the smoke, so that fuel combustion and further decomposition of undecomposed calcium carbonate in the powdered lime are facilitated; 1. the secondary suspension calcining furnace adopts the combination of rotational flow and spouting movement, thereby improving the effects of combustion, heat exchange and decomposition reaction.
The bottom of the primary suspension calciner and the bottom of the secondary suspension calciner are both provided with air inlet chambers for introducing spurting air and discharging the discharged materials when the interior of the calciner is abnormal, so that the quality of lime is not influenced by the operation of the calciner. Wherein the secondary air inlet chamber is also used as an ignition chamber for ignition and as an auxiliary combustion chamber for increasing the temperature of combustion air entering the bottom of the secondary suspension calciner.
The active powder lime secondary suspension calcining device uses solid fuels such as coal powder, petroleum coke powder and the like, and can also use fuel oil and natural gas. Fuel oil or natural gas is used as fuel when igniting.
The invention adopts a multistage suspension preheater to recover the heat of the waste gas of the primary suspension calciner, namely preheating limestone powder to reduce the temperature of the waste gas, feeding the waste gas of the cyclone separator at the outlet of the primary suspension calciner into the multistage suspension preheater to gradually heat the fed limestone powder, and feeding the preheated limestone powder into the primary suspension calciner to calcine.
The invention adopts a multistage suspension cooler to recover the heat of the finished product powder lime of the secondary suspension calciner, namely, the combustion air is preheated to reduce the temperature of the finished product, and the finished product powder lime obtained by separation and collection of the secondary cyclone separator enters the multistage suspension cooler and is gradually cooled to below 120 ℃.
The invention adopts a fluidization cooler to cool the blanking of the primary suspension calciner and the secondary suspension calciner when the primary suspension calciner and the secondary suspension calciner are abnormal, and the exhaust gas of the fluidization cooler enters an air inlet chamber at the lower part of the secondary suspension calciner.
The air preheated by the multistage suspension cooler is taken as combustion air of fuel, and is introduced into the primary suspension calcining furnace and the secondary suspension calcining furnace in three paths by a high-temperature fan at the outlet of the multistage suspension cooler, and the air enters the secondary air inlet chamber and is sprayed through a secondary necking, flows of a secondary cone and flows of a primary cone respectively, and the proportion of the air can be adjusted.
The outlet cyclone separators of the first-stage suspension calciner and the second-stage suspension calciner are determined to be single or two parallel according to the size of the required production energy of the powdered lime, and the corresponding multi-stage suspension preheater and the multi-stage suspension cooler are arranged in a single row or two rows in parallel.
The series number of the multistage suspension preheaters is determined according to the requirement of the exhaust gas discharge temperature of the multistage suspension preheaters, and the series number of the multistage suspension coolers is determined according to the requirement of the temperature of the finished product powder lime of the multistage suspension coolers.
The active powder lime two-stage suspension calcining device combines a two-stage suspension calcining furnace, a cyclone separator, a multi-stage suspension preheater, a multi-stage suspension cooler and the like which are connected in series, and completes the whole process of preheating and decomposing limestone powder and cooling powder lime in a suspension state.
Compared with the prior blocky lime calcining device, the blocky lime calcining device has the advantages that:
1. preheating, decomposing and cooling in a suspension state, high heat exchange efficiency and low heat consumption of the system.
2. CaCO3 is decomposed in powder form, the reaction speed is high, and the decomposition degree is high; the temperature distribution of the suspension calcining furnace is uniform and controllable, the decomposition reaction is uniform, and the stability and uniformity of the product quality are greatly improved.
3. The high-temperature preheating, decomposing and cooling processes are carried out in a static device which does not operate, the operation is stable and reliable, and the operation rate is high.
4. The production scale is easy to be enlarged, the unit product occupies small area, the investment is saved, and the comprehensive energy consumption and the cost are low.
5. Limestone with various particle sizes can be ground into powder as a raw material, so that the utilization rate of high-quality resources is improved.
6. Particularly, the limestone powder is fired by a series-connected secondary suspension calciner, so that the content of active calcium oxide powder of the finished product lime can be further improved.
Drawings
FIG. 1 is a diagram of a two-stage suspension calcining device for active powder lime
FIG. 2 is a structural diagram of a primary suspension calciner.
Fig. 3 is a structural diagram of a secondary suspension calciner.
FIG. 4 is a structure diagram of the middle necking of the cylinder of the primary and secondary suspension calcining furnaces.
FIG. 5 is a sectional view of the inlet structure of limestone powder and powdered lime.
Fig. 6 is a top view of the inlet structure for limestone powder and powdered lime.
Detailed Description
As shown in fig. 1 to fig. 6, a two-stage suspension calcining device for active powder lime comprises a multi-stage suspension preheater 1, a one-stage suspension calciner 3, a one-stage cyclone separator 4, a two-stage suspension calciner 6, a two-stage cyclone separator 7, a multi-stage suspension cooler 9 and a fluidization cooler 13, wherein:
limestone powder A serving as a raw material enters the multistage suspension preheater 1 from the upper end of the multistage suspension preheater 1, the lower end of the multistage suspension preheater 1 is communicated with a limestone powder inlet 36 at the side part of the primary suspension calciner 3 through a discharge pipe, and the limestone powder A enters the primary suspension calciner 3 through the discharge pipe after being preheated by the multistage suspension preheater 1;
a fuel inlet 37 is arranged on the side part of the primary suspension calciner 3 for introducing fuel D, a combustion air inlet 38 is arranged for introducing combustion air, a waste gas inlet 39 is also arranged on the side part of the primary suspension calciner 3, the upper end of the primary suspension calciner 3 is communicated with the top of the primary cyclone separator 4 through a primary gooseneck 35, the lower end of the primary suspension calciner 3 is communicated with the fluidization cooler 13 through an ash discharge pipe, preheated limestone powder A enters the primary suspension calciner 3 through the limestone powder inlet 36, the limestone powder is calcined in the primary suspension calciner 3 under the combustion air environment by using the fuel, the pulverized lime and waste gas obtained preliminarily after calcination enter the primary cyclone separator 4 through the primary gooseneck 35, and the blanking formed when the calcination is abnormal enters the fluidization cooler 13 through the ash discharge pipe;
an exhaust gas outlet at the upper end of the primary cyclone separator 4 is communicated with the lower end of the multistage suspension preheater 1, the lower end of the primary cyclone separator 4 is communicated with a powdered lime inlet 66 at the side part of the secondary suspension calciner 6 through a discharge pipe, the primary cyclone separator 4 separates the exhaust gas from the preliminarily obtained powdered lime, wherein the exhaust gas is recycled to the multistage suspension preheater 1 through the exhaust gas outlet, the limestone powder A in the multistage suspension preheater 1 is preheated by utilizing the exhaust gas, and the powdered lime separated by the primary cyclone separator 4 is led to the secondary suspension calciner 6 through the discharge pipe;
a fuel inlet 67 is formed in the side part of the secondary suspension calciner 6 for introducing fuel D, combustion air inlets 68 and 69 for introducing combustion air, an exhaust inlet 611 is formed in the side part of the secondary suspension calciner 6, the lower end of the secondary suspension calciner 6 is communicated with the fluidization cooler 13 through an ash discharge pipe, one side of the upper end of the secondary suspension calciner 6 is communicated with one side of the secondary cyclone separator 7, the powdered lime separated by the primary cyclone separator 4 enters the secondary suspension calciner 6 through a powdered lime inlet 66, the powdered lime is calcined in the secondary suspension calciner 6 under the combustion air environment by using the fuel, the finished powdered lime and waste gas obtained after calcination are led to the secondary cyclone separator 7, and blanking formed during abnormal calcination enters the fluidization cooler 13 through the ash discharge pipe;
the upper end of the secondary cyclone separator 7 is provided with a waste gas outlet which is communicated with a waste gas inlet 39 of the primary suspension calciner 3, the lower end of the secondary cyclone separator 7 is communicated with the upper end of the multistage suspension cooler 9 through a discharging pipe, the waste gas and finished powdered lime are separated by the secondary cyclone separator 7, wherein the waste gas is recycled through the waste gas outlet and led to the primary suspension calciner 3, the waste gas is used for providing heat assistance for the calcined powdered lime in the primary suspension calciner 3, and the finished powdered lime separated by the secondary cyclone separator 7 is led to the multistage suspension cooler 9 through the discharging pipe;
the upper end of a multistage suspension cooler 9 is provided with a high-temperature air outlet, the lower end of the multistage suspension cooler 9 is provided with a lime powder discharge pipe and an air inlet pipe, the high-temperature air outlet of the multistage suspension cooler 9 is respectively communicated with a combustion air inlet 38 of a first-stage suspension calciner 3 and combustion air inlets 68 and 69 of a second-stage suspension calciner 6 through a high-temperature fan 17 and a combustion air pipeline 10, the air inlet pipe of the multistage suspension cooler 9 is introduced with air through a fan, the air cools finished lime powder in the multistage suspension cooler 9, the cooled finished lime powder B is discharged through the lime powder discharge pipe, the air and the finished lime powder are subjected to heat exchange to form high-temperature air serving as combustion air, and the combustion air is respectively led to the first-stage suspension calciner 3 and the second-stage suspension calciner 6 through the high-temperature fan 17;
air is introduced into the fluidization cooler 13 through a fan, a blanking outlet is formed in one end of the fluidization cooler 13, an exhaust outlet is further formed in the fluidization cooler 13, the exhaust outlet in the fluidization cooler 13 is communicated with an exhaust inlet 611 of the secondary suspension calciner 6, blanking formed when the primary suspension calciner 3 and the secondary suspension calciner 6 are abnormally combusted respectively enters the fluidization cooler 13, heat exchange is carried out between the blanking C and the air in the fluidization cooler 13 and cooling is carried out, the blanking C is discharged through the blanking outlet, high-temperature air formed after heat exchange is recycled to the secondary suspension calciner 6 through the exhaust outlet, and the high-temperature air is used for providing heat assistance for calcining powdered lime in the secondary suspension calciner 6.
As shown in fig. 2, 5, and 6, the primary suspension calciner 3 includes: the primary air inlet chamber 31, the primary necking 32, the primary cone 33 and the primary column 34, wherein the upper end of the primary column 34 is communicated with the top of the primary cyclone separator 4 through the primary gooseneck 35, the lower end of the primary column 34 is communicated with the upper end of the primary air inlet chamber 31 through the primary cone 33 and the primary necking 32 in sequence, and the lower end of the primary air inlet chamber 31 is communicated with the fluidized cooler 13 through an ash discharge pipe;
a limestone powder inlet 36 is arranged on one side of the lower part of the primary column 34, and limestone powder enters the primary column 34 downwards and radially through the limestone powder inlet 36;
the side of the primary cone 33 is provided with a combustion air inlet 38, and the combustion air inlet 38 leads the combustion air to horizontally or downwards cut into the primary cone 33; the side part of the primary cone 33 is provided with fuel inlets 37 which are arranged at the front upper part and the front upper part of a combustion air inlet 38 in opposite directions, the two fuel inlets are opposite, and the fuel inlets enable the fuel to cut downwards to enter the primary cone 33;
an exhaust gas inlet 39 is arranged on one side of the upper part of the primary air inlet chamber 31.
A material dispersing device 311 is arranged in the limestone powder inlet 36.
As shown in fig. 3, 5, and 6, the secondary suspension calciner 6 includes: the device comprises a secondary air inlet chamber 61, a secondary necking 62, a secondary cone 63 and a secondary column 64, wherein one side of the upper end of the secondary column 64 is communicated with one side of a secondary cyclone separator 7 through an outlet, the lower end of the secondary column 64 is communicated with the upper end of the secondary air inlet chamber 61 through the secondary cone 63 and the secondary necking 62 in sequence, and the lower end of the secondary air inlet chamber 61 is communicated with a fluidization cooler 13 through an ash discharge pipe;
a lime powder inlet 66 is formed in one side of the lower portion of the secondary cylinder 64, and the lime powder inlet 66 enables lime powder to enter the secondary cylinder 64 in a downward radial direction;
the side part of the secondary cone 63 is provided with a combustion air inlet 68, and the combustion air inlet 68 leads the combustion air to horizontally or downwards cut into the secondary cone 63; the fuel inlets 67 are oppositely arranged at the side parts of the secondary cone 63 in the front upper part and the front upper part of the combustion air inlet 68, the two fuel inlets are opposite, and the fuel inlets enable the fuel to be cut downwards to enter the secondary cone 63;
the side part of the secondary air inlet chamber 61 is provided with a combustion air inlet 69, and the combustion air inlet 69 enables combustion air to enter the secondary air inlet chamber 61 in a downward (or horizontal) cutting direction (or radial direction); the side of the secondary air intake chamber 61 is further provided with an exhaust inlet 611 and an ignition auxiliary fuel inlet 610, wherein the ignition auxiliary fuel inlet 610 causes the ignition auxiliary fuel E to cut downwards to enter the secondary air intake chamber 61.
A material dispersing device 613 is arranged in the lime powder inlet 66.
The first-stage cyclone separators 4 can be single or two parallel, and the corresponding multi-stage suspension preheaters 1 are single-row or two-row parallel.
The two-stage cyclone separators 7 can be single or two parallel, and the corresponding multi-stage suspension coolers 9 are single-row or two-row parallel.
As shown in fig. 4, a plurality of intermediate throats 310 are provided at different heights in the primary tower 34 of the primary suspension calciner 3, and a plurality of intermediate throats 612 are provided at different heights in the secondary tower 64 of the secondary suspension calciner 6.
Referring to fig. 1, the active powder lime secondary suspension calcining device of the invention comprises: the device comprises a multistage suspension preheater 1, a discharge pipe flap valve 2 of the multistage suspension preheater 1, a first-stage suspension calciner 3, a first-stage cyclone separator 4, a discharge pipe flap valve 5 of the first-stage cyclone separator 4, a second-stage suspension calciner 6, a second-stage cyclone separator 7, a discharge pipe flap valve 8 of the second-stage cyclone separator 7, a multistage suspension cooler 9, a combustion air pipeline 10 from the multistage suspension cooler 9 to the first-stage suspension calciner 3 and the second-stage suspension calciner 6, a fluidized ash discharge pipe flap valve 11 at the bottom of the first-stage suspension calciner 3, an ash discharge pipe flap valve 12 at the bottom of the second-stage suspension calciner 6, a cooler 13, a powder lime discharge pipe electric flap valve 14 of the multistage suspension cooler 9, an electric gate valve 15 at the bottom of an air inlet pipe of the multistage suspension cooler 9, an automatic regulating valve 16 on the combustion air pipeline 10, and a high-temperature fan 17 at the outlet of the multistage suspension cooler 9.
Referring to fig. 2, the secondary suspension calcining device of the powdered lime of the invention comprises a primary suspension calcining furnace 3, which comprises: a primary air inlet chamber 31, a primary necking 32, a primary cone 33, a primary cylinder 34, a primary gooseneck 35, a limestone powder inlet 36, a primary cone fuel inlet 37, a primary cone combustion air inlet 38 and a waste gas inlet 39 of the secondary cyclone separator 7.
The primary air inlet chamber 31 at the lower part of the primary suspension calciner 3 is used for introducing the outlet waste gas of the secondary suspension calciner 6 into the primary necking 32 at the lower part of the calciner for spouting and discharging the blanking material when the primary suspension calciner 3 is abnormal. In the upper part of the primary air inlet chamber 31, the waste gas inlet 39 of the secondary cyclone 7 is cut downward (or horizontally) (or radially).
The primary air inlet chamber 31 at the lower part of the primary suspension calciner 3 is connected with a primary cone 33 through a primary reducing opening 32, a primary cone combustion air inlet 38 is arranged at the upper part of the primary cone 33 and horizontally cuts (or cuts) into the primary cone, and two opposite primary cone fuel inlets 37 are arranged at the front upper part and opposite direction of the primary cone combustion air inlet 38 and cut into the primary cone.
The upper end of a primary cone 33 of the primary suspension calciner 3 is connected with a primary cylinder 34, and the lower part of the primary cylinder 34 is provided with a limestone powder inlet 36 which enters downwards and radially.
The outlet at the upper end of a primary column 34 of the primary suspension calciner 3 is connected with a primary gooseneck pipe 35, and the primary gooseneck pipe 35 is connected with a primary cyclone separator 4.
Referring to fig. 3, the secondary suspension calciner 6 of the secondary suspension calciner of the powdered lime of the present invention comprises: a secondary air inlet chamber 61, a secondary reducing opening 62, a secondary cone 63, a secondary column 64, an upper end outlet 65, a lime powder inlet 66, a secondary cone fuel inlet 67, a secondary cone combustion air inlet 68, a secondary air inlet chamber combustion air inlet 69, an ignition auxiliary fuel inlet 610 and a fluidization cooler exhaust inlet 611.
The secondary air inlet chamber 61 at the lower part of the secondary suspension calciner 6 is used for introducing preheated combustion air into the secondary necking 62 at the lower part of the calciner for spouting, and also used as an ignition chamber and an auxiliary combustion chamber, and discharging the blanking of the secondary suspension calciner 6 in abnormal conditions. In the lower portion of the secondary air intake chamber 61, the secondary air intake chamber combustion air inlet 69 cuts (or radially) downward (or horizontally) and the ignition pilot fuel inlet 610 cuts downward.
The secondary air inlet chamber 61 at the lower part of the secondary suspension calciner 6 is connected with a secondary cone 63 through a secondary reducing port 62, a secondary cone combustion air inlet 68 is arranged at the upper part of the secondary cone 63 and horizontally cuts (or cuts) into the secondary cone, and two opposite secondary fuel inlets 67 are arranged above and opposite to the front part of the secondary cone combustion air inlet 68 and cut into the secondary cone.
The upper end of a secondary cone 63 of the secondary suspension calciner 6 is connected with a secondary cylinder 64, and the lower part of the secondary cylinder 64 is provided with a lime powder inlet 66 which enters downwards and radially.
The outlet at the upper end of the secondary cylinder 64 of the secondary suspension calciner 6 is connected with a secondary cyclone separator 7. A secondary gooseneck can also be added at the outlet at the upper end of the secondary column 64 to be connected with the secondary cyclone separator 7.
2~3 intermediate reducing mouths 310 are arranged at different heights in the column 34 of the primary suspension calciner 3; 1~2 intermediate reducing mouths 612 are arranged at different heights in the column 64 of the secondary suspension calciner 6. Fig. 4 is a structural feature thereof.
The limestone powder feed inlet 36 of the primary suspension calciner 3 is provided with a material scattering device 311, and the limestone powder feed inlet 66 of the secondary suspension calciner 6 is provided with a material scattering device 613, so that the fed materials are uniformly distributed on the cross section in the kiln. Fig. 5 and 6 are structural features thereof.
The main link for implementing the invention is that,
preparing, storing, metering and conveying limestone powder: the method comprises the steps of crushing blocky limestone with the water content of less than 4% (the granularity is generally less than 60 mm), grinding to obtain fine limestone powder with the water content of less than 1% (the fineness R is 0.08 minus sieve of 5-25%), collecting the fine limestone powder by a cyclone dust collector, and conveying the fine limestone powder into a powder homogenizing warehouse by a bucket elevator and other conveying equipment. The homogenized limestone powder is fed into an active powder lime secondary suspension calcining device shown in figure 1 by a bucket elevator after steady flow measurement.
Waste gas treatment: the waste gas at the outlet of the multistage suspension preheater of the active powder lime two-stage suspension calcining device shown in figure 1 is discharged to a bag dust collector through a high-temperature fan for purification and then discharged, and the dust collected by the bag dust collector is sent to a limestone powder homogenizing warehouse through a conveying device.
Storing the powdered lime: a powder warehouse is arranged to store finished powder lime products and defective products such as deposited ash blanking and the like obtained by the active powder lime secondary suspension calcining device shown in figure 1 respectively.
Fuel storage, grinding, metering and conveying: coal, petroleum coke and other solid fuels enter a piling shed for storage, fine powder (fineness R0.08 with screen residue 1~6%) with the water content of less than 1% is prepared by grinding, and the fine powder is collected by a dust collector and then enters a bin for storage. The powdery fuel in the silo is metered by a powder metering device and then enters the active powder lime secondary suspension calcining device shown in figure 1 through pneumatic transmission. The fineness of the solid fuel powder is adjusted according to the variety, quality and characteristics of the solid fuel powder.
Claims (8)
1. The utility model provides an active powder lime second grade suspension calcining device which characterized in that: the device comprises a multistage suspension preheater, a first-stage suspension calciner, a first-stage cyclone separator, a second-stage suspension calciner, a second-stage cyclone separator, a multistage suspension cooler and a fluidization cooler, wherein:
limestone powder serving as a raw material enters the multistage suspension preheater from the upper end of the multistage suspension preheater, the lower end of the multistage suspension preheater is communicated with a limestone powder inlet at the side part of the primary suspension calciner through a discharge pipe, and the limestone powder enters the primary suspension calciner through the discharge pipe after being preheated by the multistage suspension preheater;
a fuel inlet is arranged on the side part of the primary suspension calciner for introducing fuel, a combustion air inlet is arranged for introducing combustion air, a waste gas inlet is also arranged on the side part of the primary suspension calciner, the upper end of the primary suspension calciner is communicated with the top of the primary cyclone separator through a primary gooseneck pipe, the lower end of the primary suspension calciner is communicated with the fluidization cooler through an ash discharge pipe, preheated limestone powder enters the primary suspension calciner through the limestone powder inlet, the limestone powder is calcined in the primary suspension calciner in a combustion air environment by using the fuel, powdered lime and waste gas obtained preliminarily after calcination enter the primary cyclone separator through the primary gooseneck pipe, and blanking formed when the calcination is abnormal enters the fluidization cooler through the ash discharge pipe;
the upper end of the primary cyclone separator is provided with a waste gas outlet which is communicated with the lower end of the multistage suspension preheater, the lower end of the primary cyclone separator is communicated with a powdered lime inlet at the side part of the secondary suspension calciner through a discharging pipe, the primary cyclone separator separates the waste gas from the primarily obtained powdered lime, wherein the waste gas is recycled to the multistage suspension preheater through the waste gas outlet, the waste gas is used for preheating the powdered lime in the multistage suspension preheater, and the powdered lime separated by the primary cyclone separator is led to the secondary suspension calciner through the discharging pipe;
the side part of the secondary suspension calciner is provided with a fuel inlet for introducing fuel and a combustion air inlet for introducing combustion air, the side part of the secondary suspension calciner is also provided with an exhaust inlet, the lower end of the secondary suspension calciner is communicated with a fluidization cooler through an ash discharge pipe, one side of the upper end of the secondary suspension calciner is communicated with one side of a secondary cyclone separator, the powdered lime separated by the primary cyclone separator enters the secondary suspension calciner through a powdered lime inlet, the powdered lime is calcined in the secondary suspension calciner under the combustion air environment by using the fuel, the fluidized powdered lime and waste gas obtained after calcination are led to the secondary cyclone separator, and blanking formed during abnormal calcination enters the cooler through an ash discharge pipe;
the upper end of the secondary cyclone separator is provided with a waste gas outlet which is communicated with a waste gas inlet of the primary suspension calciner, the lower end of the secondary cyclone separator is communicated with the upper end of the multi-stage suspension cooler through a discharging pipe, the waste gas and finished powder lime are separated by the secondary cyclone separator, wherein the waste gas is recycled through the waste gas outlet and is led to the primary suspension calciner, the waste gas is used for providing heat assistance for calcining the limestone powder in the primary suspension calciner, and the finished powder lime separated by the secondary cyclone separator is led to the multi-stage suspension cooler through the discharging pipe;
the upper end of the multistage suspension cooler is provided with a high-temperature air outlet, the lower end of the multistage suspension cooler is provided with a lime powder discharge pipe and an air inlet pipe, the high-temperature air outlet of the multistage suspension cooler is respectively communicated with a combustion air inlet of the first-stage suspension calciner and a combustion air inlet of the second-stage suspension calciner through a high-temperature fan and a combustion air pipeline, the air inlet pipe of the multistage suspension cooler is introduced with air through a fan, the air cools the finished lime powder in the multistage suspension cooler, the cooled finished lime powder is discharged through the lime powder discharge pipe, the air and the finished lime powder form high-temperature air after heat exchange to serve as combustion air, and the combustion air is respectively led to the first-stage suspension calciner and the second-stage suspension calciner through the high-temperature fan;
air is introduced into the fluidization cooler through a fan, one end of the fluidization cooler is provided with a blanking outlet, the fluidization cooler is also provided with an exhaust outlet, the exhaust outlet on the fluidization cooler is communicated with an exhaust inlet of the secondary suspension calciner, blanking formed when the primary suspension calciner and the secondary suspension calciner are abnormally combusted respectively enters the fluidization cooler, the blanking is discharged through the blanking outlet after the heat exchange and the cooling with the air in the fluidization cooler, high-temperature air formed after the heat exchange is recycled to the secondary suspension calciner through the exhaust outlet, and the high-temperature air is used for providing heat for calcining powdered lime in the secondary suspension calciner.
2. The active powder lime secondary suspension calcination device of claim 1, characterized in that: the primary suspension calciner comprises: the upper end of the primary cylinder is communicated with the top of the primary cyclone separator through a primary gooseneck pipe, the lower end of the primary cylinder is communicated with the upper end of the primary air inlet chamber through the primary cone and the primary necking pipe in sequence, and the lower end of the primary air inlet chamber is communicated with the fluidized cooler through an ash discharge pipe;
one side of the lower part of the primary cylinder is provided with a limestone powder inlet, and the limestone powder inlet enables the limestone powder to radially enter the primary cylinder downwards;
the side part of the primary cone is provided with a combustion air inlet, and the combustion air inlet enables combustion air to horizontally or downwards cut into the primary cone; the side part of the primary cone is positioned in the front upper part and the front upper part of the combustion air inlet, and is oppositely provided with a fuel inlet, the two fuel inlets are opposite, and the fuel enters the primary cone in a downward cutting direction;
one side of the upper part of the first-stage air inlet chamber is provided with a waste gas inlet.
3. The active fine lime secondary suspension calcining device as claimed in claim 2, wherein: a material dispersing device is arranged in the limestone powder inlet.
4. The active fine lime secondary suspension calcining device of claim 1, which is characterized in that: the secondary suspension calciner comprises: the device comprises a secondary air inlet chamber, a secondary necking, a secondary cone and a secondary cylinder, wherein one side of the upper end of the secondary cylinder is communicated with one side of a secondary cyclone separator through an outlet, the lower end of the secondary cylinder is communicated with the upper end of the secondary air inlet chamber through the secondary cone and the secondary necking in sequence, and the lower end of the secondary air inlet chamber is communicated with a fluidized cooler through an ash discharge pipe;
a powder lime inlet is formed in one side of the lower portion of the secondary cylinder, and the powder lime inlet enables the powder lime to enter the secondary cylinder in a downward radial direction;
the side part of the secondary cone is provided with a combustion air inlet, and the combustion air inlet enables combustion air to horizontally or downwards enter the secondary cone; the side part of the secondary cone is positioned at the front upper part and the front upper part of the combustion air inlet, and is oppositely provided with a fuel inlet, the two fuel inlets are opposite, and the fuel enters the secondary cone in a downward cutting direction;
the side part of the secondary air inlet chamber is provided with a combustion air inlet, and the combustion air inlet enables combustion air to enter the secondary air inlet chamber downwards or horizontally or radially; the side part of the secondary air inlet chamber is also provided with an exhaust inlet and an ignition auxiliary fuel inlet, wherein the ignition auxiliary fuel inlet enables the ignition auxiliary fuel to be cut downwards to enter the secondary air inlet chamber.
5. The active fine lime secondary suspension calcining device of claim 4, which is characterized in that: a material dispersing device is arranged in the lime powder inlet.
6. The active fine lime secondary suspension calcining device of claim 1, which is characterized in that: the first-stage cyclone separator can be single or two parallel cyclones, and the corresponding multi-stage suspension preheater is single-row or two-row parallel cyclones.
7. The active fine lime secondary suspension calcining device of claim 1, which is characterized in that: the two-stage cyclone separator can be single or two parallel, and the corresponding multi-stage suspension cooler is single-row or two-row parallel.
8. The active fine lime secondary suspension calcining device as claimed in claim 2 or 4, wherein: a plurality of middle necking ports are arranged in the primary column body of the primary suspension calcining furnace at different heights, and a plurality of middle necking ports are arranged in the secondary column body of the secondary suspension calcining furnace at different heights.
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| CN107673637A (en) * | 2017-12-01 | 2018-02-09 | 河南中蓝新材料科技有限公司 | The suspension roasting device and its production technology of a kind of powdery active lime |
| CN107698179A (en) * | 2017-12-01 | 2018-02-16 | 河南中蓝新材料科技有限公司 | A kind of strength gaseous suspension cooling means for being used to produce powdery active lime system |
| CN107759115A (en) * | 2017-12-12 | 2018-03-06 | 泰安中意重型工业设备有限公司 | The new process for calcining and device of a kind of powdered lime |
| CN109320107A (en) * | 2018-10-26 | 2019-02-12 | 辽宁科技大学 | Suspension-boiling multithread state combination preparation high activity light calcined magnesia method |
| CN109052997B (en) * | 2018-10-26 | 2021-05-18 | 辽宁科技大学 | Method for preparing high-activity light-burned magnesium oxide by using fixed bed-fluidized bed in multi-flow state |
| CN109467323B (en) * | 2019-01-15 | 2023-11-21 | 王誓学 | Lime suspension calcination process equipment |
| CN111892832B (en) * | 2020-07-29 | 2021-04-06 | 东北大学 | Method for preparing multistage calcined kaolin by suspension calcination of coal-series kaolin |
| CN111777340B (en) * | 2020-08-20 | 2024-04-23 | 辽宁东大粉体工程技术有限公司 | Device for preparing light burned magnesia and enriching carbon dioxide by smoke self-circulation pyrolysis |
| CN111847466A (en) * | 2020-08-24 | 2020-10-30 | 合肥水泥研究设计院有限公司 | Black talc powder suspension calcining and whitening device and process |
| DE102021205828A1 (en) * | 2021-06-09 | 2022-12-15 | Refratechnik Holding Gmbh | Process and apparatus for producing a calcined material |
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