CN107285651B - Active powder lime suspension calcining device - Google Patents
Active powder lime suspension calcining device Download PDFInfo
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- CN107285651B CN107285651B CN201710556429.2A CN201710556429A CN107285651B CN 107285651 B CN107285651 B CN 107285651B CN 201710556429 A CN201710556429 A CN 201710556429A CN 107285651 B CN107285651 B CN 107285651B
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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
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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
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Abstract
The invention discloses an active powder lime suspension calcining device which is suitable for calcining limestone fine powder (the fineness is R0.08 minus 5 to 25 percent) with the moisture content of less than 1 percent into active lime, and consists of a suspension calcining furnace, a cyclone separator, a multistage suspension preheater, a multistage suspension cooler and the like. It is characterized in that a part of the powdered lime fired by the suspension calciner enters the kiln to be decomposed (the proportion of the powdered lime is adjustable from 0 to 50 percent), and the content of active calcium oxide in the finished product of the powdered lime can be further improved.
Description
Technical Field
The invention relates to the field of a lime powder calcining device, in particular to an active lime powder suspension calcining device.
Background
The active lime is a basic raw material in the steel industry, is also widely used in industries such as calcium carbide, electric power, glass fiber, building materials, papermaking and sewage treatment, and the annual dosage is about billion tons, wherein the steel industry and the calcium carbide industry mainly use blocky materials, and the industries such as electric power desulfurization, glass fiber, building materials, papermaking and sewage treatment 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 limestone calcining apparatus commonly used is as follows:
| calcining device | Feeding shape | Heat loss (kcal/kg) | Remarks for note |
| Ordinary 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 shape 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 the grinding power consumption is high. 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 an active powder lime suspension calcining device, so that the production process of powder lime is changed from calcining massive limestone to grinding the massive limestone into powder to grinding the massive limestone to powder suspension, preheating, calcining and cooling, the energy consumption in the production process of the powder 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 suspension calcining device which characterized in that: the device comprises a multistage suspension preheater, a suspension calciner, a cyclone separator, a multistage suspension cooler and a fluidization cooler, limestone powder serving as a raw material is introduced into 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 suspension calciner through a discharge pipe, and the limestone powder is preheated by the multistage suspension preheater and then introduced into the suspension calciner through the discharge pipe;
the side part of the suspension calciner is provided with a combustion air inlet for introducing combustion air, a fuel inlet for introducing fuel and an ignition auxiliary fuel inlet for introducing ignition auxiliary fuel, the side part of the suspension calciner is also provided with a lime powder inlet and an exhaust inlet, the lower end of the suspension calciner is communicated with the fluidization cooler through an ash discharge pipe, the upper end of the suspension calciner is communicated with the cyclone separator through a gooseneck pipe, after limestone powder enters the suspension calciner, the limestone powder is calcined in the combustion air by using the fuel to obtain lime powder and waste gas, the lime powder and the waste gas are introduced into the cyclone separator through the gooseneck pipe, and blanking generated during abnormal calcination is introduced into the fluidization cooler through the ash discharge pipe;
the upper end of the cyclone separator is communicated with the lower end of the multistage suspension preheater through an exhaust gas discharge pipe, the lower end of the cyclone separator is connected with two discharging pipes through an automatic material distributing valve, one discharging pipe is communicated to the upper end of the multistage suspension cooler, the other discharging pipe is communicated to a lime powder inlet on the side part of the suspension calciner, the lime powder and the exhaust gas obtained after calcination by the suspension calciner are introduced into the cyclone separator, the exhaust gas and the lime powder are separated by the cyclone separator, the exhaust gas is introduced into the multistage suspension preheater through an exhaust gas discharge pipe, the lime powder is preheated in the multistage suspension preheater by utilizing the exhaust gas, one part of the lime powder is introduced into the multistage suspension cooler through the automatic material distributing valve and the corresponding discharging pipe, and is cooled to be used as a finished product, and the other part of the lime powder is introduced into the suspension calciner for recycling calcination again through the automatic material distributing valve and the corresponding discharging pipe;
the upper end of the multistage suspension cooler is provided with a combustion air outlet, the combustion air outlet of the multistage suspension cooler is communicated with a combustion air inlet on the side part of the suspension calciner, the lower end of the multistage suspension cooler is provided with an air inlet pipe and a powdered lime discharging pipe, air is introduced into the air inlet pipe of the multistage suspension cooler through a fan, the air exchanges heat with the finished powdered lime in the multistage suspension cooler to cool the finished powdered lime, the cooled finished powdered lime is discharged through the powdered lime discharging pipe, the air forms high-temperature air after heat exchange, the high-temperature air is taken as combustion air and introduced into the suspension calciner through a combustion air outlet, and the high-temperature air is taken as the combustion air led into the suspension calciner;
the fluidized cooler is introduced with air through a fan, one end of the fluidized cooler is connected with a blanking discharge pipe, the upper part of the fluidized cooler is also provided with an exhaust outlet, the exhaust outlet of the fluidized cooler is communicated with an exhaust inlet of the suspension calcining furnace, the blanking enters the fluidized cooler to be subjected to heat exchange with the air so as to cool the blanking, the cooled blanking is discharged through a blanking discharge pipe, and the air is led into the suspension calcining furnace through the exhaust outlet after heat exchange to serve as heat assistance during calcining.
The active powder lime suspension calcining device is characterized in that: the suspension calcining furnace comprises a main body decomposition section, a connecting throat, a circulating decomposition section, a cone section, a lower throat and a lower air collecting chamber, wherein the upper end of the main body decomposition section is connected with a gooseneck pipe, the lower end of the main body decomposition section is communicated with the upper end of the circulating decomposition section through the connecting throat, the lower end of the circulating decomposition section is communicated with the upper end of the lower air collecting chamber through the cone section and the lower throat in sequence, and the lower end of the lower air collecting chamber is connected with an ash discharging pipe, wherein:
the side part of the main body decomposition section is provided with a limestone powder inlet, a cylinder fuel inlet and a cylinder combustion air inlet, the cylinder combustion air inlet is communicated with a combustion air outlet of the multistage suspension cooler, the cylinder combustion air inlet enables combustion air to horizontally or downwards cut into the main body decomposition section, the cylinder fuel inlets are respectively positioned at the front upper part and the front upper part opposite positions of the cylinder combustion air inlet, the two cylinder fuel inlets are opposite, the cylinder fuel inlet enables fuel to downwards cut into the main body decomposition section, the limestone powder inlet is positioned at the upper position of the cylinder fuel inlet, and the limestone powder inlet enables limestone powder to downwards and radially enter the main body decomposition section;
a powdered lime inlet is formed in one side of the lower portion of the circulating decomposition section, the powdered lime inlet is connected with a cyclone separator through a corresponding discharge pipe connected with an automatic material distributing valve, and the powdered lime which is not completely calcined enters the circulating decomposition section through the powdered lime inlet in a downward radial mode;
the cone side part is provided with a cone combustion air inlet which is communicated with a combustion air outlet of the multi-stage suspension cooler, the cone combustion air inlet enables the combustion air to horizontally cut or cut downwards to enter the cone, the cone side part is positioned in the front upper part and the front upper part of the cone combustion air inlet, cone fuel inlets are oppositely arranged, and fuel is supplied to the cone fuel inlets and cut downwards to enter the cone;
the side part of the lower air-gathering chamber is provided with a lower air-gathering chamber combustion air inlet, an ignition auxiliary fuel inlet and a fluidization cooler exhaust inlet, wherein the lower air-gathering chamber combustion air inlet is communicated with a combustion air outlet of the multistage suspension cooler, the lower air-gathering chamber combustion air inlet enables combustion air to enter the lower air-gathering chamber downwards or horizontally or radially, the ignition auxiliary fuel inlet enables ignition auxiliary fuel to enter the lower air-gathering chamber downwards or horizontally, and the fluidization cooler exhaust inlet is communicated with an exhaust outlet of the fluidization cooler.
The active powder lime suspension calcining device is characterized in that: a plurality of intermediate necking holes are arranged at different heights in the main decomposition section of the suspension calciner.
The active powder lime suspension calcining device is characterized in that: the limestone powder inlet and the powder lime inlet of the suspension calcining furnace are both provided with a material scattering device.
The active powder lime suspension calcining device is characterized in that: the cyclone separator can be single or two parallel separators. The corresponding multistage suspension preheater and the multistage suspension cooler are in single row or two rows in parallel.
Lime production has three important links: the key point is to improve the decomposition rate of calcium carbonate generated by calcining limestone.
The invention designs an active powder lime suspension calcining furnace, wherein a cyclone separator is arranged at an outlet of the furnace to separate and collect the burnt powder lime, one part of the powder lime is cooled by a multi-stage suspension cooler to be used as finished product powder lime, one part of the powder lime enters the furnace to be circularly decomposed again (the proportion of the powder lime can be adjusted within 0 to 50 percent), and the lower part of the suspension calcining furnace is provided with a circulating decomposition section for the initial decomposition of the powder lime. The combination of rotational flow and spouting movement in the suspension calcining furnace improves the effects of combustion, heat exchange and decomposition reaction.
The bottom of the suspension calcining furnace is provided with a lower air collection chamber for introducing spurting air; the air is also used as an ignition chamber for ignition and an auxiliary combustion chamber for increasing the temperature of combustion air entering the furnace; and discharging the discharged material when the lime is abnormal in the furnace, thereby ensuring that the quality of the lime is not influenced by the operation of the furnace.
The suspension calcining furnace of the invention 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 discharged waste gas, namely preheating limestone powder to reduce the temperature of the waste gas, feeding the waste gas of a cyclone separator at the outlet of the furnace into the multistage suspension preheater to gradually heat the fed limestone powder, and feeding the preheated limestone powder into the furnace for calcination.
The invention adopts a multistage suspension cooler to recover the heat of the finished product powder lime discharged from the furnace, namely, preheating combustion air to reduce the temperature of the finished product, and feeding the lime finished product obtained by separation and collection of a cyclone separator into the multistage suspension cooler to be gradually cooled to below 120 ℃.
The invention adopts the fluidization cooler to cool the blanking of the suspension calciner when the suspension calciner is abnormal, and the exhaust of the fluidization cooler enters the lower air collecting chamber of the suspension calciner.
The air preheated by the multistage suspension cooler is used as combustion air of the suspension calciner, is introduced into the furnace in three paths, namely, air is fed into a lower necking spurting chamber through a lower air collecting chamber, cone-shaped rotational flow and lower rotational flow of a main decomposition section, and the proportion of the air can be adjusted.
The number of the cyclone separators at the outlet of the suspension calciner is determined according to the required production capacity of the powdered lime, and the number of the corresponding multi-stage suspension preheaters and the multi-stage suspension coolers is determined to be one or two.
And determining the series stages of the multistage suspension preheaters according to the requirement of the exhaust gas discharge temperature of the multistage suspension preheaters, and determining the series stages of the multistage suspension coolers according to the requirement of the temperature of the finished product powder lime of the multistage suspension coolers.
The active powder lime suspension calcining device combines a suspension calcining furnace, a cyclone separator, a multi-stage suspension preheater, a multi-stage suspension cooler and the like together, and finishes the whole processes of limestone powder preheating, decomposition and powder lime cooling in a suspension state.
Compared with the current lump lime calcining device, the 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、CaCO 3 The powder is decomposed, 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, decomposition 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, a part of lime burnt by the suspension calciner enters the kiln to be decomposed, so that the content of the active calcium oxide powder of the finished product lime can be further improved.
Drawings
FIG. 1 is a structural diagram of an active powder lime suspension calcining device.
Fig. 2 is a structural diagram of a suspension calciner.
FIG. 3 is a plan view of the various inlets to the suspension calciner cone and the cyclic decomposition stage.
FIG. 4 is a plan view showing the positional relationship between the various inlets of the main decomposing field of the suspension calciner.
FIG. 5 is a structural characteristic diagram of a middle necking in a decomposition section of a main body of a suspension calciner.
FIG. 6 is a sectional view showing the structural characteristics of inlets for limestone powder and powdered lime of the suspension calciner.
FIG. 7 is a top view of the structural features of the inlets for limestone powder and powdered lime for the suspension calciner.
Detailed Description
As shown in fig. 1 to 7, an active powder lime suspension calcining device comprises a multistage suspension preheater 1, a suspension calcining furnace 2, a cyclone separator 3, a multistage suspension cooler 6 and a fluidization cooler 10, wherein limestone powder a serving as a raw material is introduced into 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 at the side part of the suspension calcining furnace 2 through a discharge pipe, and the limestone powder is preheated by the multistage suspension preheater 1 and then introduced into the suspension calcining furnace 2 through the discharge pipe;
the side part of the suspension calciner 2 is provided with a combustion air inlet for introducing combustion air, a fuel inlet for introducing fuel B and an ignition auxiliary combustion fuel inlet for introducing ignition auxiliary combustion fuel C, the side part of the suspension calciner 2 is also provided with a lime powder inlet and an exhaust inlet, the lower end of the suspension calciner 2 is communicated with the fluidization cooler 10 through an ash discharge pipe, the upper end of the suspension calciner 2 is communicated with the cyclone separator 3 through a gooseneck pipe 27, after limestone powder enters the suspension calciner 2, the limestone powder is calcined in the combustion air by using the fuel to obtain lime powder and exhaust gas, the lime powder and the exhaust gas are introduced into the cyclone separator 3 through the gooseneck pipe 27, and blanking generated in abnormal calcination is introduced into the fluidization cooler 10 through the ash discharge pipe;
the upper end of a cyclone separator 3 is communicated with the lower end of a multistage suspension preheater 1 through a waste gas discharge pipe, the lower end of the cyclone separator 3 is connected with two paths of discharge pipes through an automatic material distribution valve 4, one path of discharge pipe is communicated to the upper end of a multistage suspension cooler 6, the other path of discharge pipe is communicated to a powder lime inlet on the side part of a suspension calciner 2, the powder lime and the waste gas obtained after calcination through the suspension calciner 2 are introduced into the cyclone separator 3, the waste gas and the powder lime are separated through the cyclone separator 3, the waste gas is introduced into the multistage suspension preheater 1 through the waste gas discharge pipe, limestone powder A is preheated in the multistage suspension preheater 1 through the waste gas, one part of the powder lime is introduced into the multistage suspension cooler 6 through the automatic material distribution valve 4 and the corresponding discharge pipe and is used as a finished product after cooling, and the other part of the powder lime is introduced into the suspension calciner 2 through the automatic material distribution valve 4 and the corresponding discharge pipe for recycling calcination;
the upper end of the multistage suspension cooler 6 is provided with a combustion air outlet, the combustion air outlet of the multistage suspension cooler 6 is communicated with a combustion air inlet at the side part of the suspension calciner 2, the lower end of the multistage suspension cooler 6 is provided with an air inlet pipe and a powdered lime discharging pipe, air is introduced into the air inlet pipe of the multistage suspension cooler 6 through a fan, the air exchanges heat with the finished powdered lime in the multistage suspension cooler 6 to cool the finished powdered lime, the cooled finished powdered lime is discharged through the powdered lime discharging pipe, the air forms high-temperature air after heat exchange, the high-temperature air is introduced into the suspension calciner 2 through a combustion air outlet as combustion air, and the high-temperature air is used as combustion air led into the suspension calciner 2;
air is introduced into the fluidization cooler 10 through a fan, one end of the fluidization cooler 10 is connected with a blanking discharging pipe, an exhaust outlet is further formed in the upper portion of the fluidization cooler 10, the exhaust outlet of the fluidization cooler 10 is communicated with an exhaust inlet of the suspension calciner 2, the blanking enters the fluidization cooler 10 to be subjected to heat exchange with the air to cool the blanking, the cooled blanking is discharged through the blanking discharging pipe, and the air is led into the suspension calciner 2 through the exhaust outlet after heat exchange to serve as heat assistance during calcination.
As shown in fig. 2, the suspension calciner 2 comprises a main body decomposition section 26, a connecting throat 25, a circulating decomposition section 24, a cone 23, a lower throat 22 and a lower air-collecting chamber 21, wherein the upper end of the main body decomposition section 26 is connected with a gooseneck 27, the lower end of the main body decomposition section 26 is communicated with the upper end of the circulating decomposition section 24 through the connecting throat 25, the lower end of the circulating decomposition section 24 is communicated with the upper end of the lower air-collecting chamber 21 through the cone 23 and the lower throat 22 in sequence, and the lower end of the lower air-collecting chamber 21 is connected with an ash-discharging pipe, wherein:
the side part of the main body decomposition section 26 is provided with a limestone powder inlet 28, a column fuel inlet 29 and a column combustion air inlet 210, the column combustion air inlet 210 is communicated with a combustion air outlet of the multistage suspension cooler 6, the column combustion air inlet 210 enables combustion air to horizontally or downwards cut into the main body decomposition section 26, the column fuel inlets 29 are respectively positioned at the front upper part and the front upper part opposite positions of the column combustion air inlet 210, the two column fuel inlets are opposite, the column fuel inlet 29 enables fuel to downwards cut into the main body decomposition section 26, the limestone powder inlet 28 is positioned at the upper position of the column fuel inlet 29, and the limestone powder inlet 28 enables limestone powder to downwards and radially enter the main body decomposition section 26;
a powdered lime inlet 211 is formed in one side of the lower portion of the circulating decomposition section 24, the powdered lime inlet 211 is connected with the cyclone separator 3 through a corresponding discharging pipe connected with the automatic distributing valve 4, and the powdered lime enters the circulating decomposition section 24 downwards and radially through the powdered lime inlet 211;
a cone combustion air inlet 213 is arranged at the side part of the cone 23, the cone combustion air inlet 213 is communicated with the combustion air outlet of the multistage suspension cooler 6, the cone combustion air inlet 213 enables the combustion air to horizontally cut or cut downwards to enter the cone 23, the cone fuel inlets 212 are respectively arranged at the side parts of the cone 23, which are positioned at the front upper part and the front upper part of the cone combustion air inlet 213, the two cone fuel inlets are opposite, and the cone fuel inlets 212 enable the fuel to cut downwards to enter the cone 23;
the side of the lower plenum 21 has a lower plenum combustion air inlet 214, an ignition co-fuel inlet 215, and a fluidizing cooler exhaust inlet 216, wherein the lower plenum combustion air inlet 214 communicates with the combustion air outlet of the multistage suspension cooler 6, the lower plenum combustion air inlet 214 splits (or radially) the combustion air downward (or horizontally) into the lower plenum 21, the ignition co-fuel inlet 215 splits (or radially) the ignition co-fuel downward into the lower plenum 21, and the fluidizing cooler exhaust inlet 216 communicates with the exhaust outlet of the fluidizing cooler 10.
As shown in fig. 5, a plurality of intermediate throats 217 are provided at different heights in the main decomposition section of the suspension calciner 2.
As shown in fig. 6 and 7, the limestone powder inlet 28 and the powdered lime inlet 211 of the suspension calciner 2 are both provided with a scattering device 218.
The cyclone separators 3 can be single or two in parallel. The corresponding multistage suspension preheater 1 and multistage suspension cooler 6 are in single or two parallel rows.
Referring to fig. 1, the active fine lime suspension calcining apparatus of the present invention includes: multistage suspension preheater 1, the burning furnace 2 is forged in the suspension, cyclone 3 arranges the automatic depiler valve 4 of row material pipe, the row of automatic depiler valve 4 expects a tub flap valve 5, multistage suspension cooler 6, suspension cooler 6 to suspension burning furnace 2's combustion air pipeline 7, the automatically regulated valve 8 on the combustion air pipeline 7, the electronic airlock valve 9 of the ash discharge pipe of 2 bottoms of suspension burning furnace, fluidization cooler 10, the powder lime of multistage suspension cooler 6 is arranged a tub flap valve 11, the electronic slide valve 12 of 6 air-supply lines bottoms of multistage suspension cooler, the row of multistage suspension preheater 1 expects a tub flap valve 13.
Referring to fig. 2, the present invention comprises a suspension calciner comprising: a lower plenum 21, a lower throat 22, a cone 23, a cyclic decomposition section 24, a connecting throat 25, a main decomposition section 26, an auxiliary decomposition section gooseneck 27, a limestone dust inlet 28, a column fuel inlet 29, a column combustion air inlet 210, a lime dust inlet 211, a cone fuel inlet 212, a cone combustion air inlet 213, a lower plenum combustion air inlet 214, a lower plenum supplemental fuel inlet 215, and a fluidized cooler exhaust inlet 216.
The lower air collecting chamber 21 of the suspension calciner 2 is used for introducing preheated combustion air into the lower furnace throat 22 for spouting, and also used as an ignition chamber and an auxiliary combustion chamber, and discharging the blanking in the abnormal condition in the furnace. In the lower portion of the lower plenum 21, a lower plenum combustion air inlet 214 is split (or radially) downward and a lower plenum ignition secondary fuel inlet 215 is split downward.
The lower air collecting chamber 21 of the suspension calcining furnace 2 is connected with a cone 23 through a lower necking 22.
The upper end of the cone 23 of the suspension calciner 2 is directly connected with the circulating decomposition section 24.
The suspension calciner 2 cone 23 is arranged with a cone combustion air inlet 213 and a cone fuel inlet 212. The cone combustion air inlet 213 enters horizontally in a tangential direction (or in a downward tangential direction), and two opposite cone fuel inlets 212 are arranged above and opposite to the cone combustion air inlet 213 and enter downwards in a tangential direction. The lower part of the circulating decomposition section 24 is provided with a lime powder inlet 211 which enters downwards and radially. Fig. 3 shows a planar positional relationship between inlets of fuel, combustion air, pulverized lime, and the like of the conical portion 23 and the circulating decomposition section 24.
The circulating decomposition section 24 of the suspension calciner 2 is connected with the main decomposition section 26 through a connecting reducing port 25.
The lower part of the main decomposition section 26 of the suspension calciner 2 is provided with a column combustion air inlet 210, a column fuel inlet 29 and a limestone powder inlet 28. The cylinder combustion air inlet 210 enters horizontally in a tangential direction (or in a downward tangential direction), and two opposite cylinder fuel inlets 29 are arranged above and opposite to the front of the cylinder combustion air inlet 210 and enter downwards in a tangential direction. Above the column fuel inlet 29, the limestone dust inlet 28 enters radially downwardly. Fig. 4 shows a planar positional relationship of inlets of fuel, combustion air, limestone powder and the like at a lower portion of the main body decomposition stage 26.
A plurality of intermediate necking 217 are arranged in the main body decomposition section 26 of the suspension calciner 2 at different heights, and the number of the intermediate necking 217 is typically 2-3. Fig. 5 is a structural feature thereof.
The limestone powder feed inlet 28 and the powdered lime feed inlet 211 of the suspension calciner 2 are both provided with a material scattering device 218, so that the fed material is uniformly distributed to the cross section in the calciner. Fig. 6 and 7 are structural features thereof.
The upper end outlet of the main decomposition section 26 of the suspension calciner 2 is connected with a gooseneck 27 of the auxiliary decomposition section.
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 prepare limestone fine powder with the water content of less than 1% (the fineness is R0.08 and the residue is 5-25 percent on sieve), collecting the limestone fine powder by a cyclone dust collector, and conveying the limestone fine 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 suspension calcining device shown in figure 1 by a bucket elevator after being measured by a steady flow.
Waste gas treatment: the waste gas at the outlet of the multistage suspension preheater of the active powder lime 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: and a powder warehouse is arranged to store the powder lime finished products and the dust deposition blanking and other defective products obtained by the active powder lime suspension calcining device shown in the figure 1 respectively.
Fuel storage, grinding, metering and conveying: the solid fuel such as coal, petroleum coke and the like enters a piling shed for storage, fine powder (the fineness R is 0.08 minus sieve is 1 to 6 percent) with the moisture content of less than 1 percent is prepared by grinding, and the fine powder is collected by a dust collector and then enters a warehouse for storage. The powdery fuel in the bin is metered by a powder metering device and then pneumatically conveyed into the active powdered lime suspension calcining device shown in figure 1. The fineness of the solid fuel powder is adjusted according to the variety, quality and characteristics of the solid fuel powder.
Claims (3)
1. The utility model provides an active powder lime suspension calcining device which characterized in that: the device comprises a multistage suspension preheater, a suspension calciner, a cyclone separator, a multistage suspension cooler and a fluidization cooler, limestone powder serving as a raw material is introduced into 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 suspension calciner through a discharge pipe, and the limestone powder is preheated by the multistage suspension preheater and then introduced into the suspension calciner through the discharge pipe; the side part of the suspension calciner is provided with a combustion air inlet for introducing combustion air, a fuel inlet for introducing fuel and an ignition auxiliary fuel inlet for introducing ignition auxiliary fuel, the side part of the suspension calciner is also provided with a lime powder inlet and an exhaust inlet, the lower end of the suspension calciner is communicated with a fluidization cooler through an ash discharge pipe, the upper end of the suspension calciner is communicated with a cyclone separator through a gooseneck pipe, after limestone powder enters the suspension calciner, the limestone powder is calcined in the combustion air by using the fuel to obtain lime powder and waste gas, the lime powder and the waste gas are introduced into the cyclone separator through the gooseneck pipe, and blanking generated during abnormal calcination is introduced into the fluidization cooler through the ash discharge pipe; the upper end of the cyclone separator is communicated with the lower end of the multistage suspension preheater through an exhaust gas discharge pipe, the lower end of the cyclone separator is connected with two discharging pipes through an automatic material distributing valve, one discharging pipe is communicated to the upper end of the multistage suspension cooler, the other discharging pipe is communicated to a lime powder inlet on the side part of the suspension calciner, the lime powder and the exhaust gas obtained after calcination by the suspension calciner are introduced into the cyclone separator, the exhaust gas and the lime powder are separated by the cyclone separator, the exhaust gas is introduced into the multistage suspension preheater through an exhaust gas discharge pipe, the lime powder is preheated in the multistage suspension preheater by utilizing the exhaust gas, one part of the lime powder is introduced into the multistage suspension cooler through the automatic material distributing valve and the corresponding discharging pipe, and is cooled to be used as a finished product, and the other part of the lime powder is introduced into the suspension calciner for recycling calcination again through the automatic material distributing valve and the corresponding discharging pipe; the upper end of the multistage suspension cooler is provided with a combustion air outlet, the combustion air outlet of the multistage suspension cooler is communicated with a combustion air inlet on the side part of the suspension calciner, the lower end of the multistage suspension cooler is provided with an air inlet pipe and a powdered lime discharging pipe, the air inlet pipe of the multistage suspension cooler is filled with air through a fan, the air exchanges heat with the finished powdered lime in the multistage suspension cooler to cool the finished powdered lime, the cooled finished powdered lime is discharged through the powdered lime discharging pipe, the air forms high-temperature air after heat exchange, the high-temperature air is used as combustion air and is filled into the suspension calciner through a combustion air outlet, and the high-temperature air is used as combustion air led into the suspension calciner; the fluidized cooler is introduced with air through a fan, one end of the fluidized cooler is connected with a blanking discharge pipe, the upper part of the fluidized cooler is also provided with an exhaust outlet, the exhaust outlet of the fluidized cooler is communicated with an exhaust inlet of the suspension calciner, the blanking enters the fluidized cooler to be subjected to heat exchange with the air so as to cool the blanking, the cooled blanking is discharged through a blanking discharge pipe, and the air is introduced into the suspension calciner through an exhaust outlet after heat exchange to serve as auxiliary heat during calcination;
the suspension calcining furnace comprises a main body decomposition section, a connecting throat, a circulating decomposition section, a cone section, a lower throat and a lower air collecting chamber, wherein the upper end of the main body decomposition section is connected with a gooseneck pipe, the lower end of the main body decomposition section is communicated with the upper end of the circulating decomposition section through the connecting throat, the lower end of the circulating decomposition section is communicated with the upper end of the lower air collecting chamber through the cone section and the lower throat in sequence, and the lower end of the lower air collecting chamber is connected with an ash discharging pipe, wherein: the side part of the main body decomposition section is provided with a limestone powder inlet, a cylinder fuel inlet and a cylinder combustion air inlet, the cylinder combustion air inlet is communicated with a combustion air outlet of the multistage suspension cooler, the cylinder combustion air inlet enables combustion air to horizontally or downwards cut into the main body decomposition section, the cylinder fuel inlets are respectively positioned at the front upper part and the front upper part opposite positions of the cylinder combustion air inlet, the two cylinder fuel inlets are opposite, the cylinder fuel inlet enables fuel to downwards cut into the main body decomposition section, the limestone powder inlet is positioned at the upper position of the cylinder fuel inlet, and the limestone powder inlet enables limestone powder to downwards and radially enter the main body decomposition section; a lime powder inlet is formed in one side of the lower portion of the circulating decomposition section and is used for being connected with a corresponding discharge pipe connected with the cyclone separator through an automatic distributing valve, and the lime powder inlet enables the lime powder to radially enter the circulating decomposition section downwards; the cone side part is provided with a cone combustion air inlet which is communicated with a combustion air outlet of the multi-stage suspension cooler, the cone combustion air inlet enables the combustion air to horizontally cut or cut downwards to enter the cone, the cone side part is positioned in the front upper part and the front upper part of the cone combustion air inlet, cone fuel inlets are oppositely arranged, and fuel is supplied to the cone fuel inlets and cut downwards to enter the cone; the side part of the lower air-gathering chamber is provided with a lower air-gathering chamber combustion air inlet, an ignition auxiliary fuel inlet and a fluidization cooler exhaust inlet, wherein the lower air-gathering chamber combustion air inlet is communicated with a combustion air outlet of the multistage suspension cooler, the lower air-gathering chamber combustion air inlet enables combustion air to enter the lower air-gathering chamber downwards or horizontally or radially, the ignition auxiliary fuel inlet enables ignition auxiliary fuel to enter the lower air-gathering chamber downwards or horizontally, and the fluidization cooler exhaust inlet is communicated with an exhaust outlet of the fluidization cooler;
a plurality of intermediate necking are arranged at different heights in the main body decomposition section of the suspension calciner;
the limestone powder inlet and the powder lime inlet of the suspension calcining furnace are both provided with a material scattering device.
2. The active fine lime suspension calcining device as claimed in claim 1, wherein: the cyclone separator can be single or two parallel separators.
3. The active fine lime suspension calcining device as claimed in claim 1, wherein: the multistage suspension preheater and the multistage suspension cooler are arranged in a single row or two rows in parallel.
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| CN108502909A (en) * | 2018-06-19 | 2018-09-07 | 郑小华 | A kind of powdery highly active calcium oxide and its production technology |
| CN109467323B (en) * | 2019-01-15 | 2023-11-21 | 王誓学 | Lime suspension calcination process equipment |
| CN117469972B (en) * | 2023-12-28 | 2024-04-16 | 宝钢金属有限公司 | Calcination device for reducing burning rate of dolomite |
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| US4569831A (en) * | 1985-04-01 | 1986-02-11 | Fuller Company | Process and apparatus for calcining gypsum |
| EP0466324A1 (en) * | 1990-07-11 | 1992-01-15 | F.L. Smidth & Co. A/S | Method and apparatus for heat treatment of pulverous material |
| WO2012126384A1 (en) * | 2011-03-24 | 2012-09-27 | 西安建筑科技大学 | Suspended external-circulating decomposition reactor having high solid-gas ratio |
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| JPS5388658A (en) * | 1976-11-29 | 1978-08-04 | Mitsubishi Heavy Ind Ltd | Fluidized bed calcining apparatus equipped with preheating means |
| CN101570406A (en) * | 2009-06-11 | 2009-11-04 | 北京市琉璃河水泥有限公司 | Calcination process of active lime |
| CN101987783B (en) * | 2010-08-27 | 2012-08-22 | 山东钢铁股份有限公司 | Method for producing active pulverized lime by utilizing coal gas to calcine limestone through suspended state pre-heating decomposing furnace |
| CN205619773U (en) * | 2016-05-06 | 2016-10-05 | 淄博科邦热工科技有限公司 | Structure of dore furnace cubic tuber pipe |
| CN105906223A (en) * | 2016-06-02 | 2016-08-31 | 浙江钙科机械设备有限公司 | Lime powder suspension calcining production line and suspension calcining process thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US4569831A (en) * | 1985-04-01 | 1986-02-11 | Fuller Company | Process and apparatus for calcining gypsum |
| EP0466324A1 (en) * | 1990-07-11 | 1992-01-15 | F.L. Smidth & Co. A/S | Method and apparatus for heat treatment of pulverous material |
| WO2012126384A1 (en) * | 2011-03-24 | 2012-09-27 | 西安建筑科技大学 | Suspended external-circulating decomposition reactor having high solid-gas ratio |
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