CN116199436B - On-line CO recovery 2 Lime preparation system and method of use thereof - Google Patents

On-line CO recovery 2 Lime preparation system and method of use thereof Download PDF

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Publication number
CN116199436B
CN116199436B CN202310484813.1A CN202310484813A CN116199436B CN 116199436 B CN116199436 B CN 116199436B CN 202310484813 A CN202310484813 A CN 202310484813A CN 116199436 B CN116199436 B CN 116199436B
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kiln
preheating
air
exhaust
enters
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CN116199436A (en
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徐瑞图
王长春
何汝生
徐潇晗
梁晶晶
索明金
汪小龙
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Beijing Ruier Nonmetal Materials Co ltd
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Beijing Ruier Nonmetal Materials Co ltd
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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
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B32/00—Carbon; Compounds thereof
    • C01B32/50—Carbon dioxide
    • 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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  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
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Abstract

The invention belongs to the technical field of lime production, and in particular relates to an online CO recycling method 2 Lime of (2)A manufacturing system and a method of use thereof. The system comprises two or more kilns, a heating device, a gas storage tank and CO 2 The air supply and exhaust pipe system, the preheating pipe system, the air supply and exhaust pipe system and the like are provided with gas sealing valves and switching valves. The system adopts sequential operation of separate kilns, utilizes valves on each pipe system to convey corresponding gases for the kilns in the preheating, calcining and cooling working procedures respectively, realizes complete separation of the preheating, calcining and cooling gases, and thereby recovers high-concentration CO on line in the lime preparation process 2 A part of the recovered CO 2 The purified and heated limestone is circularly used for calcining limestone, and the other part is collected and stored.

Description

On-line CO recovery 2 Lime preparation system and method of use thereof
Technical Field
The invention belongs to the technical field of lime production, and particularly relates to an online CO recycling method 2 Lime preparation system and method of use thereof.
Background
Lime, calcium oxide (CaO), is widely used in the iron and steel industry, calcium carbide industry, alumina industry, refractory industry, and the like, and is one of the production raw materials necessary for these large-scale industrial fields. For example, in the metallurgical industry, about 100-150 kg of metallurgical lime is required per 1 ton of steel produced. The main raw material for preparing lime is limestone, and the main component of the limestone is calcium carbonate (CaCO) 3 ) The basic principle of lime firing is to decompose calcium carbonate in limestone into calcium oxide and carbon dioxide (CO) by means of high temperature 2 ）。
Currently, the lime calcination process comprises three procedures of preheating, calcination and cooling. When lime is prepared by adopting the vertical lime kiln, coolingAfter the air of lime enters the calcining section, the air of lime is decomposed with CO from high-temperature flue gas and limestone of the calcined lime 2 Mixing to form a mixture mainly comprising CO 2 、N 2 CO from the kiln roof after passing through the preheating stage 2 The concentration is generally 25-30%; when the rotary kiln is used for preparing lime, the components of the kiln outlet tail gas are similar to those of the vertical lime kiln; when the rotary kiln is adopted for calcination, the vertical preheater and the independent cooling device are configured, the cooling tail gas is used as secondary air to participate in fuel combustion, and the calcination tail gas enters the vertical preheater for limestone preheating, and at the moment, the CO of the tail gas of the vertical preheater is used as the secondary air to participate in the fuel combustion 2 The concentration was about 35%. CO due to these tail gases 2 The concentration is very low, and the tail gas is directly discharged into the atmosphere after being dedusted in many lime preparation places, so that the environment is polluted. Although pressure swing adsorption and the like can now be used for low CO 2 CO from tail gas from lime production 2 Trapping but this approach requires investment in construction of special facilities and is due to CO 2 The concentration is low, the production and operation costs are high, the economic benefits of enterprises are obviously affected, and the method is difficult to popularize widely in the lime industry.
The above-mentioned results show that the existing lime preparation process has the problems of cooling tail gas, calcining limestone and decomposing CO 2 The fuel combustion flue gas is mixed integrally, and CO can not be realized in the lime preparation process 2 The tail gas is separated and recycled and directly discharged into the atmosphere, so that the environment is polluted; at the same time, due to the CO of the tail gas of the preparation process 2 Low concentration, CO by pressure swing adsorption and other techniques 2 During trapping, the investment and production operation cost are high, and the economic benefit of enterprises is obviously affected.
Chinese patent (publication No. CN103979806 a) discloses a carbon dioxide recovery chamber type vertical lime kiln. The technology heats limestone by heat radiation of a combustion chamber partition wall, although the technology avoids CO decomposed by combustion flue gas and limestone through the combustion chamber partition wall 2 Mixing, but avoiding cooling air (i.e. cooling air), limestone to decompose CO 2 The two are mixed, the pressure of an exhaust pipe and a cold air pipe is required to be strictly controlled, otherwise, the cooling air is mixed with CO 2 In reducing recovered CO 2 Or the presence of CO 2 The problem of drawing in cooling air into the atmosphere. The method has complex system pressure control and is difficult to realize cooling air and CO 2 Is completely separated. Meanwhile, the method for heating the limestone by means of the thermal radiation of the partition wall has the problems that the temperature of the limestone far from the partition wall is low, the temperature of the limestone near to the partition wall is high, the limestone is heated unevenly, the degree of overburning and undercooling is high, the quality of lime is low and the like.
Chinese patent publication No. CN106892578A discloses a method for completely recovering CO 2 The lime kiln device adopts the mode that the induced draft tube at the upper part of the inner sleeve pumps out the cooling air to avoid the cooling air and CO 2 Is a mixture of (a) and (b). The method also has the same problems as the Chinese patent CN103979806A, and the pressure of the air guiding pipe still needs to be strictly controlled, otherwise, the cooling air is mixed with CO 2 CO reduction 2 Concentration or CO 2 Mixing in the cooling air and exhausting the cooling air into the atmosphere.
Lime is one of the main raw materials of industries such as steel, calcium carbide, alumina, refractory materials and the like, and more than one hundred million tons of lime are needed in the year. The current lime preparation process provides lime and simultaneously has a large amount of CO 2 The release of gases into the atmosphere does not meet the guidelines for reducing carbon emissions and green manufacturing, and therefore there is a need to develop a lime production and at the same time economically capture CO 2 Is provided.
Disclosure of Invention
To overcome the defects in the prior art, the invention provides an on-line recovery method of CO 2 Lime preparation system and method of use thereof. The invention can overcome the defect that the prior lime process technology can not fully recover limestone to decompose CO 2 Is not enough, and simply and economically fully recovers CO decomposed by limestone 2 。
In order to achieve one of the above purposes, the present invention adopts the following technical scheme:
on-line CO recovery 2 The lime preparation system comprises two or more kilns and further comprises:
a heating device; the heating device passes throughCO 2 The air supply pipe system independently supplies heated CO to each kiln 2 Hot gas;
preheating a piping system; the preheating pipe system is used for conveying CO after limestone calcination discharged from the kiln 2 The mixed gas is sent into other kilns, and limestone in the other kilns is preheated;
an air supply piping; the air supply pipe system is connected with an air inlet of each kiln through a pipeline;
CO 2 an exhaust gas treatment unit; CO 2 Exhaust gas treatment Unit through CO 2 Exhaust piping and CO of each kiln 2 The outlets are connected independently, CO 2 The outlet of the exhaust treatment unit is respectively connected with the air storage tank and the heating device;
an air exhaust piping; the inlet of the air exhaust pipe system is independently connected with the air outlet of each kiln; the outlet of the air exhaust pipe system is connected with a chimney.
Preferably, CO 2 The air supply pipe system comprises an air supply main pipe, two or more air supply pipes, wherein the inlet of the air supply main pipe is connected with the outlet of the heating device, the outlet of the air supply main pipe is respectively connected with the inlets of the two or more air supply pipes, and the outlet of the air supply pipe is connected with CO of the kiln 2 An inlet connection; the number of gas supply pipes is the same as the number of kilns.
Preferably, CO 2 The exhaust pipe system comprises two or more exhaust pipes and an exhaust main pipe, the outlet of the exhaust pipe is connected with the inlet of the exhaust main pipe, and the inlet of the exhaust pipe is connected with CO of the kiln 2 The number of the exhaust pipes is the same as that of the kilns.
Preferably, the preheating pipe system comprises a second preheating pipe, a preheating main pipe and a first preheating pipe which are sequentially connected, wherein the inlet of the second preheating pipe is connected with the exhaust pipe, and the outlet of the first preheating pipe is connected with CO of the kiln 2 The inlet is connected.
Preferably, the air supply pipe system comprises an air blower, an air supply main pipe and two or more air supply pipes, wherein the outlets of the air supply main pipe are respectively connected with the inlets of the two or more air supply pipes, and the outlets of the air supply pipes are connected with the air inlets of the kiln; the number of the air supply pipes is the same as that of the kilns; an air blower is connected to the inlet of the air supply tube.
Preferably, the air exhaust pipe system comprises an air exhaust main pipe and two or more air exhaust pipes, wherein the inlet of the air exhaust main pipe is respectively connected with the outlets of the two or more air exhaust pipes, and the inlet of the air exhaust pipe is connected with the air outlet of the kiln; the number of the air exhaust pipes is the same as that of the kilns.
Preferably, CO 2 The exhaust treatment unit comprises a second heat exchanger and a second dust remover which are connected with the exhaust main pipe, and the outlet of the second dust remover is respectively connected with the air storage tank and the heating device through an exhaust fan.
Preferably, the air exhaust main pipe is sequentially connected with a first heat exchanger, a first dust remover, an induced draft fan and a chimney along the exhaust direction of the air exhaust main pipe.
The second object of the present invention is to provide an on-line CO recycling system 2 The application method of the lime preparation system comprises the following specific steps:
s1, calcining in a kiln A: CO heated by heating device 2 Gas is passed through CO 2 The air supply pipe system enters the kiln A, and the preheated limestone in the kiln A is calcined; after the calcination is completed, kiln A enters a cooling stage;
s2, preheating the kiln B: before the calcining of kiln A is completed, CO from kiln A 2 CO at outlet 2 The mixed gas sequentially passes through CO connected with kiln A 2 The exhaust pipe system and the preheating main pipe enter a kiln B to preheat the limestone in the kiln B; after the kiln A finishes calcining, closing a preheating main pipe connected with the kiln B and opening CO of the kiln B 2 Air supply piping, heating CO from heating device 2 Through CO 2 The air supply pipe system enters the kiln B and continuously preheats the limestone in the kiln B; after the preheating is finished, kiln B enters a calcination stage;
s3, kiln A cooling: opening an air supply pipe system connected with the kiln A, and enabling air to enter the kiln A to cool the calcined lime; after cooling is completed, the kiln A enters a discharging and charging stage;
s4, kiln discharge and charging: opening a kiln discharge device A to discharge the cooled finished lime; after the discharging is finished, closing the discharging device, opening the charging device of the kiln A, and charging limestone into the kiln A; after the loading is completed, the loading device is closed, and kiln A enters a preheating stage;
s5, calcining in a kiln B: CO heated by heating device 2 Gas is passed through CO 2 The air supply pipe system enters a kiln B, and the preheated limestone in the kiln B is calcined; after the calcination is completed, kiln B enters a cooling stage;
s6, preheating the kiln A: before calcining kiln B, CO from kiln B 2 CO at outlet 2 The mixed gas sequentially passes through CO connected with kiln B 2 The exhaust pipe system and the preheating main pipe enter the kiln A to preheat the limestone in the kiln A; after the kiln B is calcined, closing a preheating main pipe connected with the kiln A and opening CO of the kiln A 2 Air supply piping, CO heated by heating device 2 Through CO 2 The air supply pipe system enters the kiln A and continuously preheats limestone in the kiln A; after the preheating is finished, kiln A enters a calcination stage;
s7, kiln B cooling: opening an air supply pipe system connected with the kiln B, and cooling the calcined lime by air in the kiln B; after cooling, the kiln B enters a discharging and charging stage;
s8, kiln discharging and charging: opening a discharging device of the kiln B, and discharging the cooled finished lime; after the discharging is finished, closing the discharging device, opening the charging device of the kiln B, and charging limestone into the kiln B; after the loading is completed, the loading device is closed, and kiln B enters a preheating stage;
in the step S2 and the step S6, the preheated CO 2 CO from kiln 2 Is discharged from an outlet and passes through CO 2 Exhaust piping, CO 2 Exhaust treatment unit, exhaust fan, part of CO 2 Returning the mixed gas to the heating device through the air blower, and returning the heated mixed gas to the kiln for calcining lime; another part of CO 2 The mixed gas enters a gas storage tank to realize CO 2 Recycling;
in the steps S1 and S5, the calcined CO 2 CO decomposed from flue gas and limestone 2 Mixing the flue gases and CO from the kiln 2 Outlet discharge for pre-treatment of limestone in another kilnHeat;
in the step S3 and the step S7, the cooled air is discharged from the air outlet of the kiln and discharged from the chimney through the air exhaust pipe system.
The third object of the present invention is to provide an on-line CO recycling system 2 The application method of the lime preparation system comprises the following specific steps:
s1, calcining in a kiln A: CO heated by heating device 2 Gas is passed through CO 2 The air supply pipe system enters the kiln A, and the preheated limestone in the kiln A is calcined; after the calcination is completed, kiln A enters a cooling stage;
s2, preheating the kiln B: CO from kiln A 2 CO at outlet 2 CO connected with kiln A 2 The exhaust pipe system and the preheating main pipe enter a kiln B to preheat the limestone in the kiln B; after the preheating is finished, kiln B enters a calcination stage;
s3, cooling in a C kiln: opening an air supply pipe system connected with the kiln C, and cooling the air in the kiln C to finish the calcined lime; after cooling, the kiln C enters a discharging and charging stage;
s4, kiln A cooling: opening an air supply pipe system connected with the kiln A, and cooling the air in the kiln C to finish the calcined lime; after cooling, the kiln C enters a discharging and charging stage;
s5, kiln discharge and charging: opening a discharging device of the kiln A, and discharging the cooled finished lime; after the discharging is finished, closing the discharging device, opening the charging device of the kiln A, and charging limestone into the kiln A; after the loading is completed, the loading device is closed, and kiln A enters a preheating stage;
s6, preheating the kiln A: CO from kiln C 2 CO at outlet 2 CO connected with C kiln 2 The exhaust pipe system and the preheating main pipe enter the kiln A to preheat the limestone in the kiln A; after the preheating is finished, kiln A enters a calcination stage;
s7, calcining in a kiln B: CO heated by heating device 2 Gas is passed through CO 2 The air supply pipe system enters a kiln B, and the preheated limestone in the kiln B is calcined; after the calcination is completed, kiln B enters a cooling stage;
s8, kiln B cooling: opening an air supply pipe system connected with the kiln B, and cooling the calcined lime by air in the kiln B; after cooling, the kiln B enters a discharging and charging stage;
s9, kiln discharging and charging: opening a discharging device of the kiln B, and discharging the cooled finished lime; after the discharging is finished, closing the discharging device, opening the charging device of the kiln B, and charging limestone into the kiln B; after the loading is completed, the loading device is closed, and kiln B enters a preheating stage;
s10, discharging and charging in a C kiln: opening a discharging device of the C kiln to discharge the cooled finished lime; after the discharging is finished, closing the discharging device, opening the charging device of the kiln C, and charging limestone into the kiln C; after the loading is completed, the loading device is closed, and the kiln C enters a preheating stage;
s11, preheating a C kiln: CO from kiln B 2 CO at outlet 2 CO connected with kiln B 2 The exhaust pipe system and the preheating main pipe enter a C kiln to preheat limestone in the C kiln; after the preheating is finished, the kiln C enters a calcination stage;
s12, calcining in a C kiln: CO heated by heating device 2 Gas is passed through CO 2 The air supply pipe system enters a C kiln, and the preheated limestone in the C kiln is calcined; after the calcination is completed, the kiln C enters a cooling stage;
in the steps S2, S6 and S11, the preheated CO 2 CO from kiln 2 Is discharged from an outlet and passes through CO 2 Exhaust piping, CO 2 Exhaust treatment unit, exhaust fan, part of CO 2 Returning the mixed gas to the heating device through the air blower, and returning the heated mixed gas to the kiln for calcining lime; another part of CO 2 The mixed gas enters a gas storage tank to realize CO 2 Recycling;
in the steps S1, S7 and S12, the calcined CO 2 CO decomposed from flue gas and limestone 2 Mixing the flue gases and CO from the kiln 2 The outlet is discharged and is used for preheating the limestone in another kiln;
in the step S3, the step S4, and the step S8, the cooled air is discharged from the air outlet of the kiln and discharged from the chimney through the air exhaust pipe system.
The invention has the advantages that:
(1) The invention utilizes CO 2 The air supply and exhaust pipe system, the preheating pipe system and the air supply and exhaust pipe system are connected in parallel with different kilns, and each kiln cycle independently completes the procedures of limestone preheating and limestone calcining and lime finished product cooling, thereby cooling air and CO decomposed in the limestone calcining process 2 Complete separation, and can recycle CO with concentration more than 95% on line 2 The gas overcomes the defect that cooling air and limestone decompose CO when lime is prepared by the lime kiln at present 2 Is mixed into a whole and is tail gas CO 2 Low concentration, direct discharge, environmental pollution and the like.
(2) The invention does not need to add special CO 2 The high-concentration CO can be recovered by only arranging a pipeline and a valve with low investment in the trapping device 2 In the process of eliminating CO production from lime 2 Emission problems and also provides low cost and high concentration of CO for industrial application 2 Raw material gas overcomes the defect of CO trapping in the prior art 2 And the cost is too high and the wide popularization is difficult.
(3) As the porosities of the limestone layer and the lime layer do not change in the preheating, calcining and cooling processes, the method preheats CO 2 CO calcination 2 The resistance of the cooling air is not changed in the respective working procedures, the regulation and control of the pressure and the flow of the system can be well realized, the working stability of the system is high, and the problem that the product quality is affected due to uneven preheating, calcining and cooling caused by unordered change of the resistance of the material layer in the prior art is solved.
(4) The method can finish the procedures of preheating, calcining and cooling by dividing the kiln, can grade limestone with different grain size ranges into the kiln for lime preparation, overcomes the limitation that the grain size ratio of the limestone cannot be more than 3 and the problem that the limestone with the grain size smaller than 20mm cannot be adopted in the prior lime preparation technology, and expands the utilization range of limestone resources.
Drawings
Fig. 1 is a process flow diagram of example 1 of the present invention.
Fig. 2 is a process flow chart of embodiment 2 of the present invention.
The meaning of the reference symbols in the figures is as follows:
01-kiln, 011-CO 2 Inlet 012-CO 2 Outlet, 013-air inlet, 014-air outlet, 02-charging device, 03-discharging device, 04-heating device, 05-air storage tank, 06-chimney, 07-CO 2 Air supply pipe system, 071-air supply main pipe, 072-air supply pipe, 073-calcining valve and 08-CO 2 Exhaust piping, 081-exhaust piping, 082 exhaust valve, 083-exhaust main piping, 09-preheating piping, 091-first preheating valve, 092-first preheating pipe, 093-preheating main piping, 094-second preheating valve, 095-second preheating pipe, 10-air blower, 11-air supply piping, 111-air supply main piping, 112-air supply piping, 113-cooling valve, 12-air exhaust piping, 121-air exhaust main piping, 122-air exhaust piping, 123-air exhaust valve, 13-induced draft fan, 14-air exhaust treatment unit, 141-first heat exchanger, 142-first dust remover, 15-CO 2 An exhaust gas treatment unit, 151-a second heat exchanger, 152-a second dust remover, 153-a temperature controller, 16-an exhaust fan, 17-a blower and 18-a recovery valve.
Detailed Description
The present invention will be further described in detail with reference to the drawings and examples, wherein all other examples, which are obtained by a person skilled in the art without making any inventive effort, are included in the scope of the present invention.
The heat insulation lining is arranged in each of the other pipelines except the pipeline of the air supply pipeline system, so that the steel structure of the pipeline is protected from being damaged by heat, and meanwhile, the heat loss of the system is reduced.
On-line CO recovery 2 The lime preparation system comprises two or more kilns 01, a heating device 04, an air storage tank 05, a chimney 06 and CO 2 Gas supply piping 07, CO 2 An exhaust pipe system 08, a preheating pipe system 09, an air supply pipe system 11, and an air exhaust pipe system 12; kiln 01 has CO 2 Inlet 011, CO 2 An outlet 012, an air inlet 013, an air outlet 014; CO 2 The air supply piping 07 includes an air supply main pipe 071 and an air supplyA gas pipe 072 and a calcination valve 073; CO 2 The exhaust piping 08 includes an exhaust pipe 081, an exhaust valve 082, and an exhaust main pipe 083; the preheating pipe system 09 includes a first preheating valve 091, a first preheating pipe 092, a preheating main pipe 093, a second preheating valve 094, and a second preheating pipe 095; the air supply pipe system 11 includes an air supply main pipe 111, an air supply pipe 112, and a cooling valve 113; the air exhaust pipe system 12 includes an air exhaust main pipe 121, an air exhaust pipe 122, and an air exhaust valve 123;
the inlet of the air supply main pipe 071 is connected with the outlet of the heating device 04, the inlet of the air supply pipe 072 is connected with the outlet of the air supply main pipe 071, and the outlet of the air supply pipe 072 is connected with CO of the kiln 01 2 The inlet 011 is connected, and the air inlet pipe 072 is provided with a calcining valve 073;
inlet of exhaust pipe 081 and CO of kiln 01 2 An outlet 012 is connected, an outlet of the exhaust pipe 081 is connected with an inlet of the main exhaust pipe 083, an outlet of the main exhaust pipe 083 is connected with an inlet of the heating device 04 and the air storage tank 05, and an exhaust valve 082 is arranged on the exhaust pipe 081;
an inlet of a second preheating pipe 095 of the preheating pipe system 09 is communicated with the exhaust pipe 081, an outlet of the second preheating pipe 095 is connected with an inlet of the preheating main pipe 093, an inlet of the first preheating pipe 092 is connected with an outlet of the preheating main pipe 093, and an outlet of the first preheating pipe 092 is connected with CO of the kiln 01 2 The inlet 011 is connected, a first preheating valve is arranged on the first preheating pipe 092, and a second preheating valve 094 is arranged on the second preheating pipe 095;
an inlet of the air supply main pipe 111 is connected with an outlet of the air blower 10, an inlet of the air supply pipe 112 is connected with an outlet of the air supply main pipe 111, an outlet of the air supply pipe 112 is connected with an air inlet 013 of the kiln 01, and a cooling valve 113 is arranged on the air supply pipe 112;
the inlet of the air exhaust pipe 122 is connected with the air outlet 014 of the kiln 01, the outlet of the air exhaust pipe 122 is connected with the inlet of the air exhaust main pipe 121, the outlet of the air exhaust main pipe 121 is connected with the chimney 06, and the air exhaust valve 123 is arranged on the air exhaust pipe 122.
A main exhaust pipe 083 between the exhaust pipe 081 and the heating device 04 is provided with CO in this order 2 An exhaust treatment unit 15, an exhaust fan 16, a blower 17 and an air storage tank 05, enterThe recovery valve 18 is provided in the main exhaust pipe 083 of the air tank 05.
CO 2 The exhaust gas treatment unit 15 comprises a second heat exchanger 151, a second dust remover 152 and a temperature controller 153 which are sequentially connected, wherein an inlet of the second heat exchanger 151 is connected with an outlet of an exhaust main pipe 083, and an outlet of the second dust remover 152 is respectively connected with the air storage tank 05 and the heating device 04 through the temperature controller 153.
An air exhaust treatment unit 14 and an induced draft fan 13 are arranged on the air exhaust main pipe 121 in front of the air exhaust pipe 122 and the chimney 06.
The air exhaust treatment unit 14 includes a first heat exchanger 141 and a first dust collector 142.
Example 1
As shown in fig. 1, the application method of the system formed by adopting 3 kilns in this embodiment comprises the following specific steps:
s1, calcining in a kiln A: under the action of the blower 17, the CO heated by the heating device 04 2 Gas passes through a main gas supply pipe 071 and a gas supply pipe 072 of kiln A, a calcining valve 073 and CO 2 Inlet 011 enters kiln A, calcine the preheated limestone in kiln A; after the calcination is finished, closing a calcination valve 073 and a second preheating valve 094 of the kiln A, and enabling the kiln A to enter an S4 cooling step;
s2, preheating the kiln B: CO from kiln A 2 CO at outlet 012 2 The mixed gas enters a preheating main pipe 093 through an exhaust pipe 081, a second preheating pipe 095 and a second preheating valve 094 of the kiln A, and then passes through a first preheating valve 091, a first preheating pipe 092 and CO of the kiln B 2 Inlet 011 enters kiln B to preheat limestone in kiln B; after the preheating is finished, closing a first preheating valve 091 and an exhaust valve 082, and enabling kiln B to enter an S6 calcination step;
s3, cooling in a C kiln: opening a cooling valve 113 of the C kiln, and allowing air to enter the C kiln through an air supply main pipe 111, an air supply pipe 112 of the C kiln, the cooling valve 113 and an air inlet 013 under the action of an air blower 10 to cool the calcined lime; after cooling is completed, closing an air exhaust valve 123 and a cooling valve 113 of the kiln C, and enabling the kiln C to enter an S10 discharging and charging step;
s4, kiln A cooling: opening a cooling valve 113 of the kiln A, and allowing air to enter the kiln A through an air supply main pipe 111, an air supply pipe 112 of the kiln A, the cooling valve 113 and an air inlet 013 under the action of an air blower 10 to cool the calcined lime; after cooling is completed, closing an air exhaust valve 123 and a cooling valve 113 of the kiln A, and enabling the kiln A to enter an S5 discharging and charging step;
s5, kiln discharge and charging: opening a discharging device 03 at the lower part of the kiln A, and discharging the cooled finished lime; after the discharging is finished, closing the discharging device 03, opening the charging device 02 at the upper part of the kiln A, and charging limestone into the kiln A; after the loading is completed, the loading device 02 is closed, and the kiln A enters the preheating step S6;
s6, preheating the kiln A: CO from kiln C 2 CO at outlet 012 2 The mixed gas enters a preheating main pipe 093 through an exhaust pipe 081, a second preheating pipe 095 and a second preheating valve 094 of the C kiln, and then passes through a first preheating valve 091, a first preheating pipe 092 and CO of the A kiln 2 Inlet 011 enters kiln A to preheat limestone in kiln A; after the preheating is finished, closing a first preheating valve 091 and an exhaust valve 082, and enabling kiln A to enter an S1 calcination step;
s7, calcining in a kiln B: under the action of the blower 17, the CO heated by the heating device 04 2 Gas passes through a main gas supply pipe 071 and a gas supply pipe 072 of kiln B, a calcining valve 073 and CO 2 Inlet 011 enters kiln B, and the preheated limestone in kiln B is calcined; after the calcination is completed, closing a calcination valve 073 and a second preheating valve 094 of the kiln B, and enabling the kiln B to enter an S8 cooling step;
s8, kiln B cooling: opening a cooling valve 113 of the kiln B, and allowing air to enter the kiln B through an air supply main pipe 111, an air supply pipe 112 of the kiln B, the cooling valve 113 and an air inlet 013 under the action of a blower 10 to cool the calcined lime; after cooling is completed, closing an air exhaust valve 123 and a cooling valve 113 of the kiln B, and enabling the kiln B to enter an S9 discharging and charging step;
s9, kiln discharging and charging: opening a discharging device 03 at the lower part of the kiln B, and discharging the cooled finished lime; after the discharging is finished, closing the discharging device 03, opening the charging device 02 at the upper part of the kiln B, and charging limestone into the kiln B; after the loading is completed, the loading device 02 is closed, and the kiln B enters an S2 preheating step;
s10, discharging and charging in a C kiln: opening a discharging device 03 at the lower part of the C kiln to discharge the cooled finished lime; after the discharging is finished, closing the discharging device 03, opening the charging device 02 at the upper part of the kiln C, and charging limestone into the kiln C; after the loading is completed, the loading device 02 is closed, and the kiln C enters an S11 preheating step;
s11, preheating a C kiln: CO from kiln B 2 CO at outlet 012 2 The mixed gas enters a preheating main pipe 093 through an exhaust pipe 081, a second preheating pipe 095 and a second preheating valve 094 of the kiln B, and then passes through a first preheating valve 091, a first preheating pipe 092 and CO of the kiln C 2 Inlet 011 enters the C kiln to preheat the limestone in the C kiln; after the preheating is finished, closing a first preheating valve 091 and an exhaust valve 082, and enabling the kiln C to enter an S12 calcination step;
s12, calcining in a C kiln: under the action of the blower 17, the CO heated by the heating device 04 2 Gas passes through a main gas supply pipe 071 and a gas supply pipe 072 of a C kiln, a calcining valve 073 and CO 2 Inlet 011 enters a C kiln, and the preheated limestone in the C kiln is calcined; after the calcination is completed, the calcination valve 073 and the second preheating valve 094 of the kiln C are closed, and the kiln C enters the cooling step S3.
In the steps S2, S6 and S11, the preheated CO 2 CO from kiln 01 2 The gas is discharged from the outlet 012, enters the main gas discharge pipe 083 through the gas discharge pipe 081 and the gas discharge valve 082, and passes through CO 2 An exhaust gas treatment unit 15, an exhaust fan 16, a part of CO 2 The mixed gas returns to the heating device 04 through the blower 17, and returns to the kiln 01 to calcine lime after being heated; another part of CO 2 The mixed gas enters the gas storage tank 5 through the recovery valve 18 to realize CO 2 And (5) recycling.
In the steps S1, S7 and S12, the calcined CO 2 CO decomposed from gas and limestone 2 The gases are mixed and CO from kiln 01 2 The outlet 012 discharges for preheating of the limestone in another kiln 01.
In the steps S3, S4, and S8, the cooled air is discharged from the air outlet 014 of the kiln 01, enters the main air discharge pipe 121 through the air discharge pipe 122 and the air discharge valve 123, passes through the air discharge treatment unit 14 and the induced draft fan 13 along the main air discharge pipe 121, and is discharged from the chimney 06.
In this embodiment, the cooling air discharged from the kiln cooling process may be directly used as combustion air for the combustion of the heating furnace fuel without passing through the first heat exchanger 141, thereby further improving the thermal efficiency of the system.
Example 2
As shown in fig. 2, the application method of the system formed by adopting 2 kilns in this embodiment includes the following specific steps:
s1, calcining in a kiln A: under the action of the blower 17, the CO heated by the heating device 04 2 Gas passes through a main gas supply pipe 071 and a gas supply pipe 072 of kiln A, a calcining valve 073 and CO 2 Inlet 011 enters kiln A, calcine the preheated limestone in kiln A; after the calcination is finished, closing a calcination valve 073 and a second preheating valve 094 of the kiln A, and enabling the kiln A to enter an S3 cooling step;
s2, preheating the kiln B: before the calcining of kiln A is completed, CO from kiln A 2 CO at outlet 012 2 The mixed gas enters a preheating main pipe 093 through an exhaust pipe 081, a second preheating pipe 095 and a second preheating valve 094 of the kiln A, and then passes through a first preheating valve 091, a first preheating pipe 092 and CO of the kiln B 2 Inlet 011 enters kiln B to preheat limestone in kiln B; after kiln A has completed calcination, the second preheating valve 094 of kiln A, the first preheating valve 091 of kiln B are closed, the calcination valve 073 of kiln B and the exhaust valve 082 are opened, and CO from the heating furnace 04 is discharged 2 Via gas supply main 071 and gas supply pipe 072 of kiln B, calcining valve 073, CO 2 Inlet 011 enters kiln B, and the limestone in kiln B is continuously preheated; after the preheating is finished, the kiln B enters an S5 calcining step;
s3, kiln A cooling: opening a cooling valve 113 of the kiln A, and allowing air to enter the kiln A through an air supply main pipe 111, an air supply pipe 112 of the kiln A, the cooling valve 113 and an air inlet 013 under the action of an air blower 10 to cool the calcined lime; after cooling is completed, closing an air exhaust valve 123 and a cooling valve 113 of the kiln A, and enabling the kiln A to enter an S4 discharging and charging step;
s4, kiln discharge and charging: opening a discharging device 03 at the lower part of the kiln A, and discharging the cooled finished lime; after the discharging is finished, closing the discharging device 03, opening the charging device 02 at the upper part of the kiln A, and charging limestone into the kiln A; after the loading is completed, the loading device 02 is closed, and the kiln A enters the preheating step S6;
s5, calcining in a kiln B: under the action of the blower 17, the CO heated by the heating device 04 2 The gas passes through the gas supply manifold 071, the gas supply pipe 072 of kiln B, the calcining valve 073 and CO 2 Inlet 011 enters kiln B, and the preheated limestone in kiln B is calcined; after the calcination is completed, closing a calcination valve 073 and a second preheating valve 094 of the kiln B, and enabling the kiln B to enter an S7 cooling step;
s6, preheating the kiln A: before calcining kiln B, CO from kiln B 2 CO at outlet 012 2 The mixed gas enters a preheating main pipe 093 through an exhaust pipe 081, a second preheating pipe 095 and a second preheating valve 094 of the kiln B, and then passes through a first preheating valve 091, a first preheating pipe 092 and CO of the kiln A 2 Inlet 011 enters kiln A to preheat limestone in kiln A; after kiln B is calcined, the second preheating valve 094 of kiln B, the first preheating valve 091 of kiln A, the calcining valve 073 of kiln A and the exhaust valve 082 are closed, and CO from the heating furnace 04 is opened 2 Via gas supply main 071 and gas supply pipe 072 of kiln B, calcining valve 073, CO 2 Inlet 011 enters kiln A, and the limestone in kiln A is continuously preheated; after the preheating is finished, kiln A enters into step S1 of calcining;
s7, kiln B cooling: opening a cooling valve 113 of the kiln B, and allowing air to enter the kiln B through an air supply main pipe 111, an air supply pipe 112 of the kiln B, the cooling valve 113 and an air inlet 013 under the action of an air blower 10 to cool the calcined lime; after cooling is completed, closing an air exhaust valve 123 and a cooling valve 113 of the kiln B, and enabling the kiln B to enter an S8 discharging and charging step;
s8, kiln discharging and charging: opening a discharging device 03 at the lower part of the kiln B, and discharging the cooled finished lime; after the discharging is finished, closing the discharging device 03, opening the charging device 02 at the upper part of the kiln B, and charging limestone into the kiln B; after the completion of the loading, the loading device 02 is closed, and kiln B enters the preheating step S2.
In the step S2 and the step S6, the preheated CO 2 CO from kiln 01 2 The gas is discharged from the outlet 012, enters the main gas discharge pipe 083 through the gas discharge pipe 081 and the gas discharge valve 082, and passes through CO 2 An exhaust gas treatment unit 15, and an exhaust fan 16, a part of the CO 2 The mixed gas is returned to the adding through a blower 17A heating device 04, heating and returning to the kiln 01 to calcine lime; another part of CO 2 The mixed gas enters the gas storage tank 5 through the recovery valve 18 to realize CO 2 And (5) recycling.
In the steps S1 and S5, the calcined CO 2 CO decomposed from gas and limestone 2 The gases are mixed and CO from kiln 01 2 The outlet 012 discharges for preheating of the limestone in another kiln 01.
In the steps S3 and S7, the cooled air is discharged from the air outlet 014 of the kiln 01, enters the main air discharge pipe 121 through the air discharge pipe 122 and the air discharge valve 123, passes through the air discharge processing unit 14 and the induced draft fan 13 along the main air discharge pipe 121, and is discharged from the chimney 06.
In the system consisting of embodiment 1, embodiment 2 and even more kilns, the same "soaking period" can be set for each lime kiln before the lime kiln enters the calcination after the preheating is completed and before the lime kiln enters the cooling after the calcination is completed, that is, the system completes the on-off switching of the related valve in the period of time, during which the material layers are soaked, and the material layer temperature difference is low, so that the calcination quality is improved. When the limestone particle size ratio is larger than 3, limestone with different particle sizes can be loaded into different kilns 01, so that the particle size ratio in the same kiln 01 is smaller than 3, namely the limestone is graded into the kiln.
Examples 1 and 2 collectable CO 2 The concentration values were all higher than 95%.
The above embodiments are merely preferred embodiments of the present invention and are not intended to limit the present invention, and any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of the present invention.

Claims (10)

1. On-line CO recovery 2 The lime preparation system is characterized by comprising two or more kilns (01), and further comprising:
a heating device (04); the heating device (04) is operated by CO 2 The air supply pipe system (07) independently supplies heated CO to each kiln (01) 2 Hot gas;
preheating piping (09); the preheating pipe system (09) is used for conveying CO after limestone calcination discharged from the kiln (01) 2 The mixed gas is sent into other kilns (01), and limestone in the other kilns (01) is preheated;
an air supply pipe system (11); the air supply pipe system (11) is independently connected with an air inlet (013) of each kiln (01) through a pipeline;
CO 2 an exhaust gas treatment unit (15); the CO 2 An exhaust gas treatment unit (15) uses CO 2 CO of the exhaust pipe system (08) and each kiln (01) 2 The outlets (012) are individually connected, the CO 2 The outlet of the exhaust treatment unit (15) is respectively connected with the air storage tank (05) and the heating device (04);
an air exhaust pipe system (12); the inlet of the air exhaust pipe system (12) is independently connected with an air outlet (014) of each kiln (01); the outlet of the air exhaust pipe system (12) is connected with a chimney (06).
2. An on-line CO recovery according to claim 1 2 Is characterized in that: the CO 2 The air supply pipe system (07) comprises an air supply main pipe (071), two or more air supply pipes (072), wherein the inlet of the air supply main pipe (071) is connected with the outlet of the heating device (04), the outlet of the air supply main pipe (071) is respectively connected with the inlets of the two or more air supply pipes (072), and the outlet of the air supply pipe (072) is connected with the CO of the kiln (01) 2 An inlet (011) connection; the number of the air supply pipes (072) is the same as that of the kilns (01).
3. An on-line CO recovery according to claim 1 2 Is characterized in that: the CO 2 The exhaust pipe system (08) comprises two or more exhaust pipes (081) and an exhaust main pipe (083), wherein the outlet of the exhaust pipe (081) is connected with the inlet of the exhaust main pipe (083), and the exhaustThe inlet of the tube (081) and CO of the kiln (01) 2 The outlets (012) are connected, and the number of the exhaust pipes (081) is the same as that of the kilns (01).
4. An on-line CO recovery according to claim 3 2 Is characterized in that: the preheating pipe system (09) comprises a second preheating pipe (095), a preheating main pipe (093) and a first preheating pipe (092) which are sequentially connected, wherein an inlet of the second preheating pipe (095) is connected with an exhaust pipe (081), and an outlet of the first preheating pipe (092) is connected with CO of the kiln (01) 2 An entry (011) is connected.
5. An on-line CO recovery according to claim 1 2 Is characterized in that: the air supply pipe system (11) comprises an air blower (10), an air supply main pipe (111) and two or more air supply pipes (112), wherein the outlets of the air supply main pipes (111) are respectively connected with the inlets of the two or more air supply pipes (112), and the outlets of the air supply pipes (112) are connected with an air inlet (013) of the kiln (01); the number of the air supply pipes (112) is the same as that of the kilns (01); the air blower (10) is connected to an inlet of an air supply tube (112).
6. An on-line CO recovery according to claim 1 2 Is characterized in that: the air exhaust pipe system (12) comprises an air exhaust main pipe (121) and two or more air exhaust pipes (122), wherein the inlets of the air exhaust main pipe (121) are respectively connected with the outlets of the two or more air exhaust pipes (122), and the inlets of the air exhaust pipes (122) are connected with the air outlet (014) of the kiln (01); the number of the air exhaust pipes (122) is the same as that of the kilns (01).
7. An on-line according to claim 3Recovery of CO 2 Is characterized in that: the CO 2 The exhaust treatment unit (15) comprises a second heat exchanger (151) and a second dust remover (152) which are connected with an exhaust main pipe (083), and the outlet of the second dust remover (152) is respectively connected with the air storage tank (05) and the heating device (04) through an exhaust fan (16).
8. An on-line CO recovery according to claim 6 2 Is characterized in that: the air exhaust main pipe (121) is sequentially connected with a first heat exchanger (141), a first dust remover (142), an induced draft fan (13) and a chimney (06) along the exhaust direction.
9. An on-line CO recovery as claimed in any one of claims 1 to 8 2 The application method of the lime preparation system is characterized by comprising the following specific steps:
s1, calcining in a kiln A: CO heated by a heating device (04) 2 Gas is passed through CO 2 The air supply pipe system (07) enters the kiln A, and the preheated limestone in the kiln A is calcined; after the calcination is completed, kiln A enters a cooling stage;
s2, preheating the kiln B: before the calcining of kiln A is completed, CO from kiln A 2 CO at outlet (012) 2 The mixed gas sequentially passes through CO connected with kiln A 2 The exhaust pipe system (08) and the preheating main pipe (093) enter the kiln B to preheat the limestone in the kiln B; after the kiln A finishes calcining, closing a preheating main pipe (093) connected with the kiln B and opening CO of the kiln B 2 A gas supply pipe system (07) for supplying CO heated by the heating device (04) 2 Through CO 2 The air supply pipe system (07) enters the kiln B and continuously preheats the limestone in the kiln B; after the preheating is finished, kiln B enters a calcination stage;
s3, kiln A cooling: opening an air supply pipe system (11) connected with the kiln A, and cooling the calcined lime by air entering the kiln A; after cooling, the kiln A enters a discharging and charging stage;
s4, kiln discharge and charging: opening a discharging device (03) of the kiln A, and discharging the cooled finished lime; after the discharging is finished, closing a discharging device (03), opening a charging device (02) of the kiln A, and charging limestone into the kiln A; after the loading is completed, the loading device (02) is closed, and kiln A enters a preheating stage;
s5, calcining in a kiln B: CO heated by a heating device (04) 2 Gas is passed through CO 2 The air supply pipe system (07) enters a kiln B, and the preheated limestone in the kiln B is calcined; after the calcination is completed, kiln B enters a cooling stage;
s6, preheating the kiln A: before calcining kiln B, CO from kiln B 2 CO at outlet (012) 2 The mixed gas sequentially passes through CO connected with kiln A 2 The exhaust pipe system (08) and the preheating main pipe (093) enter the kiln A to preheat the limestone in the kiln A; after the kiln B is calcined, a preheating main pipe (093) connected with the kiln A is closed, and CO of the kiln A is opened 2 A gas supply pipe system (07) for supplying CO heated by the heating device (04) 2 Through CO 2 The air supply pipe system (07) enters the kiln A and continuously preheats limestone in the kiln A; after the preheating is finished, kiln A enters a calcination stage;
s7, kiln B cooling: opening an air supply pipe system (11) connected with the kiln B, and cooling the calcined lime by air in the kiln B; after cooling, the kiln B enters a discharging and charging stage;
s8, kiln discharging and charging: opening a discharging device (03) of the kiln B, and discharging the cooled finished lime; after the discharging is finished, closing a discharging device (03), opening a charging device (02) of the kiln B, and charging limestone into the kiln B; after the completion of loading, the loading device (02) is closed, and kiln B enters a preheating stage;
in the step S2 and the step S6, the preheated CO 2 CO from kiln (01) of mixed gas 2 An outlet (012) for discharging through CO 2 Exhaust pipe system (08), CO 2 An exhaust gas treatment unit (15), an exhaust fan (16), and a part of CO 2 The mixed gas returns to the heating device (04) through the blower (17), and returns to the kiln (01) to calcine lime after being heated; another part of CO 2 The mixed gas enters a gas storage tank (5) to realize CO 2 Recycling;
the step S1, SIn step 5, calcined CO 2 CO decomposed from flue gas and limestone 2 Mixing the flue gas and CO from the kiln (01) 2 An outlet (012) for preheating the limestone in the other kiln (01);
in the steps S3 and S7, the cooled air is discharged from an air outlet (014) of the kiln (01) and discharged from a chimney (06) through an air exhaust pipe system (12).
10. An on-line CO recovery as claimed in any one of claims 1 to 8 2 The application method of the lime preparation system is characterized by comprising the following specific steps:
s1, calcining in a kiln A: CO heated by a heating device (04) 2 Gas is passed through CO 2 The air supply pipe system (07) enters the kiln A, and the preheated limestone in the kiln A is calcined; after the calcination is completed, kiln A enters a cooling stage;
s2, preheating the kiln B: CO from kiln A 2 CO at outlet (012) 2 CO of the mixed gas connected with kiln A 2 The exhaust pipe system (08) and the preheating main pipe (093) enter the kiln B to preheat the limestone in the kiln B; after the preheating is finished, kiln B enters a calcination stage;
s3, cooling in a C kiln: opening an air supply pipe system (11) connected with the kiln C, and cooling the calcined lime by air in the kiln C; after cooling, the kiln C enters a discharging and charging stage;
s4, kiln A cooling: opening an air supply pipe system (11) connected with the kiln A, and cooling the calcined lime by air entering the kiln A; after cooling, the kiln A enters a discharging and charging stage;
s5, kiln discharge and charging: opening a discharging device (03) of the kiln A, and discharging the cooled finished lime; after the discharging is finished, closing a discharging device (03), opening a charging device (02) of the kiln A, and charging limestone into the kiln A; after the loading is completed, the loading device (02) is closed, and kiln A enters a preheating stage;
s6, preheating the kiln A: CO from kiln C 2 CO at outlet (012) 2 CO connected with C kiln 2 Exhaust pipeThe system (08) and the preheating main pipe (093) enter the kiln A to preheat the limestone in the kiln A; after the preheating is finished, kiln A enters a calcination stage;
s7, calcining in a kiln B: CO heated by a heating device (04) 2 Gas is passed through CO 2 The air supply pipe system (07) enters a kiln B, and the preheated limestone in the kiln B is calcined; after the calcination is completed, kiln B enters a cooling stage;
s8, kiln B cooling: opening an air supply pipe system (11) connected with the kiln B, and cooling the calcined lime by air in the kiln B; after cooling, the kiln B enters a discharging and charging stage;
s9, kiln discharging and charging: opening a discharging device (03) of the kiln B, and discharging the cooled finished lime; after the discharging is finished, closing a discharging device (03), opening a charging device (02) of the kiln B, and charging limestone into the kiln B; after the completion of loading, the loading device (02) is closed, and kiln B enters a preheating stage;
s10, discharging and charging in a C kiln: opening a discharging device (03) of the C kiln, and discharging the cooled finished lime; after the discharging is finished, closing a discharging device (03), opening a charging device (02) of the kiln C, and charging limestone into the kiln C; after the loading is completed, the loading device (02) is closed, and the kiln C enters a preheating stage;
s11, preheating a C kiln: CO from kiln B 2 CO at outlet (012) 2 CO connected with kiln B 2 The exhaust pipe system (08) and the preheating main pipe (093) enter a C kiln to preheat limestone in the C kiln; after the preheating is finished, the kiln C enters a calcination stage;
s12, calcining in a C kiln: CO heated by a heating device (04) 2 Gas is passed through CO 2 The air supply pipe system (07) enters a C kiln, and the preheated limestone in the C kiln is calcined; after the calcination is completed, the kiln C enters a cooling stage;
in the steps S2, S6 and S11, the preheated CO 2 CO from kiln (01) of mixed gas 2 An outlet (012) for discharging through CO 2 Exhaust piping (08), CO 2 An exhaust gas treatment unit (15), an exhaust fan (16), and a part of CO 2 Mixed gas channelThe blower (17) returns to the heating device (04), and returns to the kiln (01) to calcine lime after heating; another part of CO 2 The mixed gas enters a gas storage tank (5) to realize CO 2 Recycling;
in the steps S1, S7 and S12, the calcined CO 2 CO decomposed from flue gas and limestone 2 Mixing the flue gas and CO from the kiln (01) 2 An outlet (012) for preheating the limestone in the other kiln (01);
in the steps S3, S4 and S8, the cooled air is discharged from the air outlet (014) of the kiln (01) and discharged from the chimney (06) through the air exhaust pipe system (12).
CN202310484813.1A 2023-05-04 2023-05-04 On-line CO recovery 2 Lime preparation system and method of use thereof Active CN116199436B (en)

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JP2002060254A (en) * 2000-08-16 2002-02-26 Nkk Corp Shaft type lime kiln and production process of quicklime
CN106892578B (en) * 2017-04-17 2019-09-13 王长春 A kind of full recycling CO2Lime kiln device
CN107543422A (en) * 2017-10-10 2018-01-05 重庆赛迪热工环保工程技术有限公司 A kind of industrial furnace near-zero release system and method
CN108314336A (en) * 2018-05-09 2018-07-24 王长春 A kind of lime kiln device using circulating air
CN113372024B (en) * 2021-07-03 2023-03-24 石家庄新华能源环保科技股份有限公司 Double-hearth kiln for calcining lime by using low-calorific-value fuel and calcining method
CN113606946B (en) * 2021-07-23 2023-04-28 中国中材国际工程股份有限公司 Carbon dioxide capturing system and emission reduction method for cement kiln tail flue gas
CN114210177A (en) * 2021-11-05 2022-03-22 浙江菲达环保科技股份有限公司 Lime kiln flue gas carbon dioxide regulation and control and carbon capture system

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