CN111763019B - Carbon capture lime calcination system and application method - Google Patents

Carbon capture lime calcination system and application method Download PDF

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CN111763019B
CN111763019B CN202010732952.8A CN202010732952A CN111763019B CN 111763019 B CN111763019 B CN 111763019B CN 202010732952 A CN202010732952 A CN 202010732952A CN 111763019 B CN111763019 B CN 111763019B
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pipeline
lime
heating
heating device
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CN111763019A (en
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张培昆
王立
夏德宏
姜泽毅
蒋滨繁
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University of Science and Technology Beijing USTB
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University of Science and Technology Beijing USTB
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    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2/00—Lime, magnesia or dolomite
    • C04B2/10—Preheating, burning calcining or cooling
    • C04B2/12—Preheating, burning calcining or cooling in shaft or vertical furnaces
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2/00—Lime, magnesia or dolomite
    • C04B2/10—Preheating, burning calcining or cooling

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)
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Abstract

A carbon capture lime calcination system and an application method belong to the technical field of lime production. The system comprises a shaft kiln and a heating device, wherein the shaft kiln is sequentially provided with a feed inlet, a preheating section, a reaction section, a soaking section, a cooling section and a discharge outlet from top to bottom; the top of the preheating section is connected with a tail gas pipeline, and the top of the preheating section is also connected with the bottom of the reaction section through a heating pipeline; the bottom of the soaking section is connected with a combustion-supporting pipeline, and the cooling section is connected with an air pipeline; the heating pipeline is provided with a heating device. After entering the shaft kiln from the feed inlet, the limestone raw material sequentially passes through a preheating section, a reaction section, a soaking section and a cooling section and becomes a lime product. The system adopts circulating carrier gas heating and air cooling, the circulating carrier gas heating avoids the mixing of carbon dioxide released by decomposing limestone and combustion flue gas, and the air cooling avoids the problem of lime recarbonation in a cooling section; the tail gas containing high-concentration carbon dioxide can be obtained, carbon trapping can be carried out without gas separation, and the carbon trapping cost is greatly reduced.

Description

Carbon capture lime calcination system and application method
Technical Field
The invention relates to the technical field of lime production, in particular to a carbon-trapping lime calcination system and an application method.
Background
Lime is an important industrial raw material and is widely used in the main industries of ferrous metallurgy, flue gas desulfurization, construction, papermaking and the like. Lime is generally obtained by thermal decomposition of limestone in shaft kilns or rotary kilns into lime and carbon dioxide, and thus the carbon emissions of the lime production industry are enormous. In china, the emission of greenhouse gases from lime production increased from 0.35 to 1.4 million tons of carbon dioxide in 1979, with 2009 accounting for over 60% of world emissions. As a carbon emission intensive industry, it can be seen that carbon dioxide emission reduction in lime production has been urgent.
The thermal decomposition reaction equation of limestone is as follows:
CaCO 3 +heat=cao+co 2 ↑
From the above reaction formula, it can be seen that carbon dioxide in the lime production process comes from two source processes, namely: (1) Carbon dioxide released during limestone decomposition, typically limestone mineral materials containing about 42% carbon dioxide by mass; (2) Carbon dioxide released during combustion of fuel, because the decomposition reaction of limestone is an endothermic reaction, the industry typically provides the high-temperature heat required for thermal decomposition of limestone by combustion of fossil fuels. In the two source processes, the carbon emission in the limestone decomposing process is dominant and accounts for about 70% of the total carbon emission in lime production.
For the conventional calcination technology widely used for lime production at present, fuel and air are directly combusted in a calcining kiln such as a shaft kiln and a rotary kiln, and the two parts of carbon dioxide are mixed and discharged as flue gas. Thus, the flue gas does not reach the purity required for carbon dioxide transport and sequestration due to the large amount of nitrogen, whereby carbon dioxide capture requires passage through a gas separation device and consumes considerable separation energy. Thus, trying to separate the two source processes is the direction of development of carbon emission reduction in lime production processes.
Disclosure of Invention
The invention aims to provide a carbon capture lime calcination system and an application method.
The specific technical scheme is as follows: a carbon capture lime calcination system, characterized by: the device comprises a shaft kiln and a heating device, wherein the shaft kiln comprises a feed inlet, a preheating section, a reaction section, a soaking section, a cooling section and a discharge outlet, and the feed inlet, the preheating section, the reaction section, the soaking section, the cooling section and the discharge outlet are sequentially arranged from top to bottom in the shaft kiln; the top of the preheating section is connected with a tail gas pipeline, the top of the preheating section is also connected with the bottom of the reaction section through a heating pipeline, the bottom of the soaking section is connected with a combustion-supporting pipeline, and the cooling section is connected with an air pipeline; the heating pipeline is provided with a heating device and a first fan.
Further, the tail gas pipeline and the heating pipeline have a section of common pipeline.
Further, the heating device is a hot blast stove, the combustion-supporting pipeline is connected to the heating device, and a second fan is arranged on the combustion-supporting pipeline.
Further, the shaft kiln is a sleeve kiln.
A method of using a carbon capture lime calcination system as described above, characterized by: after entering the shaft kiln from the feed inlet, the limestone raw material sequentially passes through a preheating section, a reaction section, a soaking section and a cooling section and becomes a lime product, and the lime product is discharged from the discharge outlet; the tail gas is discharged through a tail gas pipeline; the hot carrier gas is sent to the bottom of the reaction section through a heating pipeline; air enters the cooling section through an air pipeline; and the auxiliary fuel gas is discharged from the bottom of the soaking section through a combustion-supporting pipeline.
Further, the hot carrier gas is divided into a part A and a part B, wherein the part A enters the reaction section, the part B enters the soaking section, and the mass flow rate of the part B is smaller than the difference between the mass flow rates of the limestone raw material and the lime product.
Further, the hot carrier gas is heated by a heating device, and the tail gas and the hot carrier gas are both from the top of the preheating section.
Further, the combustion-supporting gas is introduced into the heating device (2) and is used as combustion-supporting gas for fuel combustion in the heating device (2).
Further, the tail gas and the hot carrier gas each comprise at least one of carbon dioxide and water vapor.
The invention provides a new lime calcination scheme, which is mainly different from the conventional calcination process in that: (1) The calcining kiln is not combusted any more, and the heat required by the calcining is provided by a heating device and is carried into the calcining kiln by carrier gas; the carrier gas at the top of the calcining kiln is divided into two parts, and one part is used as tail gas to be sent into a related device for capturing treatment or recycling utilization; the other strand is used as a hot carrier gas to be introduced into the heating device, and the heat provided by the heating device is brought into the reaction section so as to provide the reaction heat required by limestone decomposition; (2) Air is introduced into the cooling section to cool the material block, so that the problem of lime recarbonation caused by carbon dioxide in the cooling section is avoided, and the quality requirement of lime products is met; (3) The soaking section is arranged, and the extraction opening is arranged at the bottom of the soaking section, so that cooling air is prevented from entering the reaction section and the preheating section, and high-purity carbon dioxide is obtained in tail gas. The scheme provided by the invention solves the problem of high carbon dioxide trapping cost in the conventional calcination process, and can greatly reduce the carbon dioxide trapping cost in the lime production process, so that the method has remarkable economic and environmental benefits.
The technical scheme of the invention has the following beneficial effects:
the reaction section of the calcining kiln does not burn fuel, but heats limestone by circulating carrier gas, so that the mixing of carbon dioxide released by decomposing the limestone and fuel combustion flue gas is avoided, and high-purity carbon dioxide is obtained in tail gas; (2) Air is introduced into the cooling section to cool the lime material block, so that the problem of lime recarbonation caused by carbon dioxide in the cooling section is avoided, and the quality requirement of lime products is met; (3) The soaking section is additionally arranged, and the air extraction opening is arranged at the bottom of the soaking section, so that cooling air is prevented from entering the reaction section and the preheating section, and high-purity carbon dioxide is obtained in tail gas. Overall, the above-described solution can greatly reduce the cost of carbon dioxide capture in lime production processes.
Drawings
FIG. 1 is a schematic diagram of a carbon capture lime calcination system according to the present invention;
FIG. 2 is a schematic diagram of a carbon capture lime calcination system according to the present invention.
Wherein: 1-a shaft kiln; 2-a heating device; 3-a tail gas pipeline; 4-heating the pipeline; 5-an air duct; 6-a combustion-supporting pipeline; 10-a feed inlet; 11-a preheating section; 12-a reaction section; 13-soaking section; 14-a cooling section; 15-a discharge hole; 41-fan I; 61-fan two.
Detailed Description
In order to make the technical problems, technical solutions and advantages to be solved more apparent, the following detailed description will be given with reference to the accompanying drawings and specific embodiments.
The invention provides a carbon capture lime calcination system and an application method.
As shown in fig. 1, the system comprises a shaft kiln 1 and a heating device 2, wherein the shaft kiln 1 comprises a feed inlet 10, a preheating section 11, a reaction section 12, a soaking section 13, a cooling section 14 and a discharge outlet 15, and the feed inlet 10, the preheating section 11, the reaction section 12, the soaking section 13, the cooling section 14 and the discharge outlet 15 in the shaft kiln 1 are sequentially arranged from top to bottom; the top of the preheating section 11 is connected with the tail gas pipeline 3, the top of the preheating section 11 is also connected with the bottom of the reaction section 12 through the heating pipeline 4, the bottom of the soaking section 13 is connected with the combustion-supporting pipeline 6, and the cooling section 14 is connected with the air pipeline 5; the heating pipeline 4 is provided with a heating device 2, and the heating pipeline 4 and the combustion-supporting pipeline 6 are respectively provided with a first fan 41 and a second fan 61.
As shown in fig. 2, the combustion supporting pipe 6 of the system is also connected to the heating device 2.
The following describes specific embodiments.
Example 1
As shown in fig. 1, the production system includes a shaft kiln 1 and a heating device 2. The shaft kiln 1 comprises the following components in sequence from top to bottom: a feed inlet 10, a preheating section 11, a reaction section 12, a soaking section 13, a cooling section 14 and a discharge outlet 15. The top of the preheating section 11 is connected with the tail gas pipeline 3, the top of the preheating section 11 is also connected with the bottom of the reaction section 12 through the heating pipeline 4, the bottom of the soaking section 13 is connected with the combustion-supporting pipeline 6, and the cooling section 14 is connected with the air pipeline 5; the heating pipeline 4 is provided with a heating device 2, and the heating pipeline 4 and the combustion-supporting pipeline 6 are respectively provided with a first fan 41 and a second fan 61.
The feed inlet 10 is used for adding limestone raw materials into the shaft kiln 1, and the discharge outlet 15 is used for discharging lime products outwards from the shaft kiln 1; the shaft kiln 1 is used for converting limestone into lime, limestone blocks in a preheating section 11 of the shaft kiln are preheated to an initial reaction temperature, the limestone blocks in a reaction section 12 of the shaft kiln are subjected to decomposition reaction and release carbon dioxide gas, the temperature of the lime blocks in a soaking section 13 of the shaft kiln is more uniform, and the lime blocks in a cooling section 14 of the shaft kiln are cooled.
The tail gas pipeline 3 is used for discharging quantitative tail gas outwards at the top of the shaft kiln 1 so as to maintain the material balance of the system; the main component of the tail gas is carbon dioxide, so that the tail gas can be subjected to carbon dioxide trapping without a gas separation process, and the emission reduction of the carbon dioxide is facilitated.
The heating pipeline 4 is used for recycling a part of carrier gas at the top of the shaft kiln 1 and sending the part of carrier gas as hot carrier gas to the bottom of the reaction section 12, a first fan 41 is arranged on the heating pipeline 4 to maintain the circulation of the hot carrier gas, and the heating pipeline 4 is also provided with a heating device 2 to increase the temperature of the hot carrier gas; the hot carrier gas is typically heated to a temperature above 1200 c and then introduced into the bottom of the reaction section 12 to provide the heat required for the limestone decomposition reaction.
The air duct 5 is used to cool the lime mass by introducing ambient air into the bottom of the cooling section 14.
The combustion-supporting pipeline 6 is used for discharging the auxiliary fuel gas from the bottom of the soaking section 13, and the combustion-supporting pipeline 6 is provided with a second fan 61 for maintaining the circulation of the auxiliary fuel gas.
The heating device 2 is typically a hot blast stove, such as a top-fired stove, a cartridge Lu Jin stove or the like.
The shaft kiln 1 is typically a sleeve kiln.
Example 2
The specific process mainly comprises the following steps:
limestone raw materials enter the shaft kiln 1 from a feed inlet 10, slowly descending material blocks in the shaft kiln sequentially pass through a preheating section 11, a reaction section 12, a soaking section 13 and a cooling section 14, the material blocks are contacted with gas, heat and mass transfer is carried out, the limestone in the material blocks is converted into lime, and lime products are obtained and discharged out of the shaft kiln 1 from a discharge outlet 15.
The gas at the top of the preheating section 11 is split into two partial discharges: tail gas and hot carrier gas. Wherein:
the tail gas is discharged through a tail gas pipeline 3 to maintain the material balance of the system.
The hot carrier gas is fed into the bottom of the reaction section 12 via the heating pipe 4, and the hot carrier gas is heated up via the heating device 2. In the reaction section 12, the temperature of the heat carrier gas from the bottom of the reaction section 12 is gradually reduced after heat is transferred to the lump in the rising process, and limestone in the lump is continuously decomposed into lime and carbon dioxide after the lump absorbs heat, so that the mass flow of the heat carrier gas is gradually increased in the rising process, and the heat carrier gas naturally rises to the bottom of the preheating section 11 after reaching the top of the reaction section 12. In the preheating section 11, the temperature of the heat carrier gas flowing upwards gradually decreases after heat is transferred to the lump, and the temperature of the lump increases after heat absorption, but the temperature of the lump is still lower than the initial reaction temperature, so that carbon dioxide is not decomposed and released, and the mass flow of the heat carrier gas is kept unchanged. The hot carrier gas, when reaching the top of the preheating section 11, is discharged in two parts, whereby the cycle is closed.
Air from the environment enters the cooling section 14 via the air duct 5. In the cooling section 14, the temperature of the air flowing upwards is raised while the block is cooled, and after reaching the top of the cooling section 14, the air enters the combustion-supporting pipeline 6 under the action of the second fan 61.
The main components of the tail gas and the hot carrier gas are carbon dioxide and also contain a certain amount of water vapor.
Example 3
In the system according to the invention, as shown in fig. 2, the combustion-supporting conduit 6 is also connected to the heating device 2.
Example 4
In comparison with example 2, the process of the carbon-trapped lime calcination system shown in fig. 2 also introduces combustion-supporting gas into the heating device 2 through the combustion-supporting pipe 6 and serves as combustion-supporting gas for the heating device 2.
While the foregoing is directed to the preferred embodiments of the present invention, it will be appreciated by those skilled in the art that various modifications and adaptations can be made without departing from the principles of the present invention, and such modifications and adaptations are intended to be comprehended within the scope of the present invention.

Claims (6)

1. A carbon capture lime calcination system, characterized by: the device comprises a shaft kiln (1) and a heating device (2), wherein the shaft kiln (1) comprises a feed inlet (10), a preheating section (11), a reaction section (12), a soaking section (13), a cooling section (14) and a discharge outlet (15), and the feed inlet (10), the preheating section (11), the reaction section (12), the soaking section (13), the cooling section (14) and the discharge outlet (15) in the shaft kiln (1) are sequentially arranged from top to bottom; the top of the preheating section (11) is connected with a tail gas pipeline (3), the top of the preheating section (11) is also connected with the bottom of the reaction section (12) through a heating pipeline (4), the bottom of the soaking section (13) is connected with a combustion-supporting pipeline (6), the combustion-supporting pipeline (6) is connected with a heating device (2), a fan II (61) is arranged on the combustion-supporting pipeline (6), and the cooling section (14) is connected with an air pipeline (5); the heating pipeline (4) is provided with a heating device (2) and a fan I (41);
the application method of the carbon capture lime calcination system comprises the following steps: after entering the shaft kiln (1) from the feed inlet (10), the limestone raw material sequentially passes through the preheating section (11), the reaction section (12), the soaking section (13) and the cooling section (14) and becomes lime products, and the lime products are discharged from the discharge port (15); air enters the cooling section (14) through the air pipeline (5); the auxiliary fuel gas is discharged from the bottom of the soaking section (13) through a combustion-supporting pipeline (6), is introduced into the heating device (2), and is used as combustion-supporting gas for fuel combustion in the heating device (2); the tail gas from the top of the preheating section (11) is discharged through a tail gas pipeline (3), the hot carrier gas from the top of the preheating section (11) is sent to the bottom of the reaction section (12) through a heating pipeline (4), the hot carrier gas is divided into a part A and a part B, wherein the part A enters the reaction section (12), the part B enters a soaking section (13), and the mass flow of the part B is smaller than the difference between the mass flow of limestone raw materials and the mass flow of lime products.
2. The carbon capture lime calcination system of claim 1, wherein: the tail gas pipeline (3) and the heating pipeline (4) are provided with a section of common pipeline.
3. The carbon capture lime calcination system of claim 1, wherein: the heating device (2) is a hot blast stove.
4. The carbon capture lime calcination system of claim 1, wherein: the shaft kiln (1) is a sleeve kiln.
5. The carbon capture lime calcination system of claim 1, wherein: the hot carrier gas is heated by a heating device (2).
6. The carbon capture lime calcination system of claim 1, wherein: the tail gas and the hot carrier gas each comprise at least one of carbon dioxide and water vapor.
CN202010732952.8A 2020-07-27 2020-07-27 Carbon capture lime calcination system and application method Active CN111763019B (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2657135C2 (en) * 1976-12-16 1986-11-13 Fritz Dr.-Ing. 8192 Geretsried Schoppe Device for the continuous production of active calcium oxide in powder form by calcining waste lime containing organic substances from the sugar industry
CN209797793U (en) * 2019-04-24 2019-12-17 山东辰岳重型机械有限公司 active quick-burning lime kiln
CN110451822B (en) * 2019-08-15 2020-12-08 北京科技大学 Recycling process for circularly calcining limestone and carbon dioxide by product gas
CN111170660A (en) * 2020-01-10 2020-05-19 北京科技大学 Lime production system and method

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