CN220265584U - Zero CO 2 Discharged lime preparation system - Google Patents
Zero CO 2 Discharged lime preparation system Download PDFInfo
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- CN220265584U CN220265584U CN202321179402.3U CN202321179402U CN220265584U CN 220265584 U CN220265584 U CN 220265584U CN 202321179402 U CN202321179402 U CN 202321179402U CN 220265584 U CN220265584 U CN 220265584U
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- 235000008733 Citrus aurantifolia Nutrition 0.000 title claims abstract description 115
- 235000011941 Tilia x europaea Nutrition 0.000 title claims abstract description 115
- 239000004571 lime Substances 0.000 title claims abstract description 115
- 238000002360 preparation method Methods 0.000 title claims abstract description 27
- 238000001354 calcination Methods 0.000 claims abstract description 127
- 238000001816 cooling Methods 0.000 claims abstract description 106
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 87
- 239000003546 flue gas Substances 0.000 claims abstract description 87
- 238000004519 manufacturing process Methods 0.000 claims abstract description 32
- 230000000295 complement effect Effects 0.000 claims description 7
- 239000007789 gas Substances 0.000 abstract description 21
- 239000000463 material Substances 0.000 abstract description 21
- 239000006227 byproduct Substances 0.000 abstract description 5
- 238000000034 method Methods 0.000 description 39
- 235000019738 Limestone Nutrition 0.000 description 10
- 239000006028 limestone Substances 0.000 description 10
- 210000000038 chest Anatomy 0.000 description 9
- 238000000354 decomposition reaction Methods 0.000 description 9
- 239000002994 raw material Substances 0.000 description 9
- 239000000047 product Substances 0.000 description 8
- 239000002918 waste heat Substances 0.000 description 8
- 239000012535 impurity Substances 0.000 description 7
- 239000000779 smoke Substances 0.000 description 5
- 238000002485 combustion reaction Methods 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 230000001502 supplementing effect Effects 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005485 electric heating Methods 0.000 description 2
- 239000002803 fossil fuel Substances 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 239000005431 greenhouse gas Substances 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
- 239000004449 solid propellant Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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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
Zero CO 2 The discharged lime preparation system comprises a primary preheating device (1), a secondary preheating device (2), a calcining device (3) and a cooling device (4); the discharge port of the primary preheating device (1) is connected to the feed port of the secondary preheating device (2); the discharge port of the secondary preheating device (2) is connected to the feed port of the calcining device (3); the discharge port of the calcining device (3) is connected to the feed port of the cooling device (4); an air outlet of the calcining device (3) is connected to an air inlet of the calcining device (3) through a first pipeline (L1); the second pipeline (L2) is separated from the first pipeline (L1) and is connected to the air inlet of the primary preheating device (1). This practice isThe traditional one-stage preheating is changed into two-stage preheating, and meanwhile, the calcination flue gas and the cooling flue gas are mutually separated to preheat the materials, so that the tail gas CO in the lime production process is greatly improved 2 Concentration, high purity CO is obtained when lime is produced 2 Gaseous byproducts.
Description
Technical Field
The utility model relates to a lime production device, in particular to a zero CO 2 A lime preparation system for emission belongs to the technical field of lime production equipment.
Background
Lime is an important industrial raw material and has wide application in the fields of metallurgy, construction and the like. The domestic lime yield in 2020 is about 3 hundred million tons, and the industrial scale is huge. At the same time, however, lime production results in large amounts of CO 2 And (5) discharging. Statistically, 1kg lime produced 1.1kg CO 2 Emission, so as to estimate the CO emitted to the atmosphere in the lime production process in China 2 The total amount exceeds 3 hundred million tons/year, and under the background of the carbon emission reduction and carbon peak reaching the full industry, the low CO is developed 2 The discharged lime production process and technology become hot spots and difficulties in technical research in the field.
The industrial lime production at the present stage mainly adopts a simple preheating-calcining-cooling process production technology. The heat required by the calcining step is provided by adopting a mode of directly supplying heat through fossil fuel combustion, the cooling step adopts normal-temperature air as a refrigerant medium, and the preheating step uses high-temperature flue gas generated by the calcining and cooling steps as a heat source. The process design can fully utilize the waste heat of the flue gas, and has higher fuel utilization efficiency. However, since the calcination flue gas is mixed with the cooling air, N in the tail gas 2 The impurity gases are more, so that CO in the exhaust gas is caused 2 The concentration is low, generally only (20-30%), so that CO in the tail gas is reduced 2 The difficulty of the enrichment and trapping technology is high, and the cost is high. Resulting in CO in tail gas of lime kiln at present 2 The enrichment and trapping are almost zero, and serious greenhouse gas emission and resource waste are generated.
Figure 3 is the most widely used lime production process at this stage. Lime raw material (limestone CaCO) at normal temperature (-20℃) 3 ) The material is gradually heated to the preheating temperature in the preheating processThe water (free or in the form of compound) in the material is removed, and then the material enters a calcination process; in the calcination process, high-power heat is provided for the material, so that the material is quickly heated to about 1050 ℃, and the material is decomposed to generate CaO and release CO at high temperature 2 Completing calcination; the high temperature CaO produced is cooled to 100 ℃ in the cooling process to form the finished lime. The heat required by the material heating and material decomposition in the calcination process is usually provided by the combustion heat release of solid fuels such as raw coal, the cooling process adopts normal-temperature air as a cooling medium, high-temperature smoke generated in the cooling process and the calcination process enters the preheating process to provide heat for the material preheating, and finally low-temperature (120 ℃) tail gas is formed and is discharged from the system.
Under the above process, the combustion process of fossil fuel such as raw coal and the like and the air-based cooling process can introduce a large amount of N into the flue gas system 2 And the impurity components are such that CO in the tail gas of the exhaust system 2 The concentration is very low, typically only 20 to 30%. CO 2 Enrichment and trapping cost and CO in flue gas 2 Initial concentration is inversely related to CO 2 The lower the concentration, the higher the enrichment capture cost. Tail gas CO produced by lime in existing working procedure 2 Too low concentration results in high enrichment and trapping cost, which becomes a constraint for CO in the lime production process 2 The main obstacle for recycling.
Disclosure of Invention
Aiming at CO in the lime production process in the prior art 2 The utility model provides a zero CO, which has the problems of large emission, high enrichment and trapping cost, environmental pollution caused by greenhouse gas emission and resource waste 2 A discharged lime preparation system. In the scheme of the utility model, the traditional one-stage preheating is changed into two-stage preheating, and the calcining smoke and the cooling smoke are mutually separated on the basis, wherein the calcining smoke is mainly used for self-circulation heat supply for calcining and primary preheating of raw materials, and the cooling smoke is used for secondary preheating of the raw materials. Namely, the utility model separates the calcination flue gas from the cooling flue gas, and can greatly improve CO in the tail gas of the lime production process on the premise of fully utilizing the waste heat of the flue gas 2 Concentration, i.e. in the production of limeWhen the CO is obtained in high purity 2 The gas by-product solves the problem of CO in the existing lime production process 2 Problems with large emissions.
According to a first embodiment of the present utility model, there is provided a zero CO 2 A discharged lime preparation system.
Zero CO 2 The system comprises a primary preheating device, a secondary preheating device, a calcining device and a cooling device. The discharge port of the primary preheating device is connected to the feed port of the secondary preheating device. The discharge port of the secondary preheating device is connected to the feed port of the calcining device. The discharge port of the calcining device is connected to the feed port of the cooling device. Wherein, the air outlet of calcining device is connected to the air inlet of calcining device via first pipeline. The second pipeline is separated from the first pipeline and connected to an air inlet of the primary preheating device.
In the present utility model, the first cooling air supply duct is connected to the air intake of the cooling device. The air outlet of the cooling device is connected to the air inlet of the secondary preheating device through a third pipeline.
Preferably, a first heat compensator is provided on the first pipe downstream of the position where the second pipe is connected to the first pipe. Preferably, the first heat complement device is a microwave heater or an electric heater.
Preferably, a first flue gas splitter is provided at a position where the second pipe is branched off from the first pipe.
In the utility model, the air outlet of the primary preheating device is connected to the first finished product CO through a pipeline 2 The system. The discharge outlet of the cooling device is connected to the first finished lime system.
According to a second embodiment of the utility model, a zero CO is provided 2 A discharged lime preparation system.
Zero CO 2 A lime preparation system for exhaust, the system comprising a preheating device and a lime kiln. The lime kiln comprises a preheating chamber, a calcining chamber and a cooling chamber which are sequentially arranged from top to bottom. Wherein the preheating chamber and the cooling chamber are arranged on the same vertical axis, and the calcining chamber is arranged offset from the axis. Pre-preparationThe discharge port of the heating device is connected to the feed port of the preheating chamber of the lime kiln. The feed opening of preheating the thorax is connected to the calcination thorax, and the feed opening of calcination thorax is connected to the cooling thorax. The upper part of the calcination chamber is provided with a flue gas outlet and the lower part is provided with a flue gas inlet, and the flue gas outlet is connected to the flue gas inlet of the calcination chamber through a fourth pipeline. A fifth pipeline is separated from the fourth pipeline and connected to an air inlet of the preheating device.
In the utility model, the second cooling air conveying pipeline is connected to an air inlet of a cooling chamber of the lime kiln. An air duct is arranged between the preheating chamber and the cooling chamber, and an air outlet of the cooling chamber is connected to an air inlet of the preheating chamber through the air duct.
Preferably, a second heat compensator is provided on the fourth pipe downstream of the connection point of the fifth pipe and the fourth pipe. Preferably, the second heat complement device is a microwave heater or an electric heater.
Preferably, a second flue gas diverter is provided at the fourth duct at a location where the fifth duct branches off.
In the utility model, the air outlet of the preheating device is connected to the second finished product CO through a pipeline 2 The system. The discharge outlet of the cooling chamber of the lime kiln is connected to a second product lime system.
Aiming at the existing lime production process CO 2 The utility model provides a zero CO, which solves the problems of large emission and resource waste 2 A discharged lime preparation system. In the scheme of the utility model, the traditional one-stage preheating is changed into two-stage preheating, and the calcination flue gas and the cooling flue gas are mutually separated on the basis, wherein a part of the calcination flue gas is used for self-circulation to supply heat for calcination, a part of the calcination flue gas is used for primary preheating of raw materials, and the cooling flue gas is used for secondary preheating of the raw materials. Therefore, the utility model separates the calcination flue gas from the cooling flue gas, and can greatly improve CO in the tail gas of the lime production process on the premise of fully utilizing the waste heat of the flue gas 2 Concentration, i.e. high purity CO can be obtained while lime is being produced 2 By-product of gas, thereby solving the problem of CO in the existing lime production 2 A series of problems caused by large discharge amount.
In particular, zero is described in the present applicationCO 2 The lime production system for the discharge includes two solutions. In a first scheme, the lime preparation system comprises a primary preheating device, a secondary preheating device, a calcining device and a cooling device which are sequentially connected, wherein an air outlet of the calcining device is connected to an air inlet of the calcining device and an air inlet of the primary preheating device respectively through a first pipeline and a second pipeline, and an air outlet of the cooling device is connected to an air inlet of the secondary preheating device through a third pipeline. In the scheme, limestone materials sequentially pass through primary preheating of a primary preheating device, secondary preheating of a secondary preheating device, calcination decomposition of a calcination device and cooling of a cooling device, so that finished lime is obtained. Wherein, the primary preheating heat source comes from the calcining device, the secondary preheating heat source comes from the cooling device, and the heat required by calcining decomposition of the calcining device is mainly self-circulation supply of high-temperature flue gas obtained by the calcining process, i.e. N is not introduced in the calcining process 2 And the impurity components are equal, so that CO in the flue gas discharged after primary preheating 2 High concentration, i.e. high purity CO can be obtained 2 Gaseous byproducts.
In a second aspect, the lime preparation system comprises a preheating device and a lime kiln arranged downstream of the preheating device. The lime kiln comprises a preheating chamber, a calcining chamber and a cooling chamber which are sequentially arranged from top to bottom, wherein the preheating chamber and the cooling chamber are arranged on the same vertical axis, and the calcining chamber is arranged deviating from the axis. For example, the preheating chamber and the cooling chamber are arranged on the vertical central axis of the lime kiln, the preheating chamber is positioned above the cooling chamber, an air duct is arranged between the preheating chamber and the cooling chamber, and the calcining chamber is arranged around the air duct by taking the central axis as the center; alternatively, the calcination chamber is arranged on the vertical central axis of the lime kiln, and the preheating chamber and the cooling chamber are respectively arranged at the upper part and the lower part of the periphery of the calcination chamber, namely, the preheating chamber and the cooling chamber are arranged on the same vertical axis of the periphery of the calcination chamber. In this scheme, preheating device's discharge gate is connected to the feed inlet that the limekiln set up on preheating the thorax, and the feed opening of preheating the thorax is connected with calcining the thorax, and the feed opening of calcining the thorax is connected with cooling the thorax. Limestone material sequentially passes through primary preheating chamber of preheating deviceSecondary preheating, calcining decomposition of the calcining chamber and cooling of the cooling chamber, thereby obtaining the finished lime. Wherein, the primary preheating heat source comes from the calcination chamber, the secondary preheating heat source comes from the cooling device, and the heat required by the calcination process of the calcination chamber comes from the self-circulation of high-temperature flue gas generated by calcination, i.e. N is not introduced in the calcination process 2 And other impurity components. Therefore, the scheme adds the preheating device on the basis of the lime kiln, separates the high-temperature flue gas generated in the calcining process of the calcining chamber from the high-temperature flue gas generated in the heat exchange of the cooling chamber, and avoids the cooling air (generally normal-temperature air) or O in the fuel combustion process in the prior art on the premise of fully utilizing the waste heat of the flue gas 2 And N 2 The impurity components such as CO in the calcination flue gas 2 The concentration is diluted, so the scheme can produce lime and obtain high-purity CO 2 And (3) gas.
In the two schemes, considering that the self-circulation of heat of high-temperature flue gas generated in the calcination process is insufficient to meet the heat required in the next round of limestone material calcination process, the self-circulation of the calcination flue gas adds a heat compensator (namely a first heat compensator or a second heat compensator) before the self-circulation of the calcination flue gas participates in the next round of calcination, and the self-circulation flue gas is heated through the heat compensator, so that the heat requirement of the calcination process is met. The heat complement device is not limited and can meet the heat demand, and for example, the heat complement device can be one of a microwave heater or an electric heater.
In the method, part of high-temperature flue gas generated in the calcination process is used for self-circulation to supply heat for calcination, and the other part of the high-temperature flue gas is used for primary preheating of raw materials, so that a flue gas flow divider (namely, a first flue gas flow divider or a second flue gas flow divider) is additionally arranged on a discharge pipeline (namely, a first pipeline or a fourth pipeline) of the calcination flue gas, reasonable distribution of the calcination flue gas is realized, the heat requirement of each process is met, and the maximum waste heat utilization is realized.
In the application, the lime production is carried out by adopting the lime preparation system adopting the two schemes, and the main process comprises 4 main processes of primary preheating, secondary preheating, calcining, cooling and the like which are used for material flow, and two auxiliary processes of heat supplementing and air flow splitting which are used for material flow are adopted. The method comprises the following steps:
main process (stream process):
primary preheating: part of the high-temperature flue gas obtained by the calcination step (CO generated by decomposition by calcination 2 Equal amounts) of limestone material at normal temperature, so that the temperature of the material is raised from 20 ℃ to about 100 ℃ and the temperature of the flue gas is lowered from 1050 ℃ to about 140 ℃.
Secondary preheating: the limestone material after primary preheating is further heated by high-temperature flue gas (the temperature is about 700 ℃ and the components are the same as air) generated in the cooling process, so that the temperature of the limestone material is further increased from 100 ℃ to about 600 ℃, and the temperature of the flue gas is reduced to about 120 ℃. The waste gas in the secondary preheating process can be discharged to a chimney, and also can be conveyed to a waste heat utilization device for further utilization of waste heat.
Calcining: the limestone material after secondary preheating is quickly heated to the calcining temperature (about 1050 ℃) by high-temperature flue gas generated by a heat compensator (microwave heating or electric heating) and continuously supplies heat, so that CaCO (CaCO) 3 Rapidly complete decomposition, produce CaO and release CO 2 。
And (3) cooling: the high-temperature blocky CaO obtained by calcination is cooled to below 100 ℃ by adopting normal-temperature air (namely cooling air), and blocky finished lime CaO is obtained and sent into a finished lime system.
Auxiliary step (gas flow step):
heat supplementing: the other part of the high-temperature flue gas obtained in the calcination procedure is recycled high-temperature CO 2 The gas is further heated by microwave heating or electric heating, so that the temperature of the gas is raised to about 1100 ℃ and the gas is used for supplying heat in the limestone calcining process.
Splitting: high temperature CO generated by calcination and decomposition 2 The flue gas (part of the flue gas is newly added by limestone decomposition and heat release, and the other part of the flue gas is flue gas for heat supply in the calcining process) is divided into two parts, one part of the flue gas is sent to a primary preheating process, and the other part of the flue gas is sent to a heat supplementing process for circulation. After primary preheating, the flue gas temperature is reduced to about 140 ℃ and then directly fed into the finished CO 2 The system.
Compared with the prior art, the utility model has the following beneficial effects:
1. the utility model changes the traditional one-stage preheating into two-stage preheating, separates the calcining flue gas and the cooling flue gas on the basis, and the two flue gas are separated to preheat the materials, thereby avoiding O in the cooling air in the prior art 2 And N 2 The impurity components such as CO in the calcination flue gas 2 Concentration dilution, thereby greatly improving CO in tail gas in lime production process 2 Concentration, i.e. obtaining high purity CO while producing lime 2 Gas, realize CO 2 And collecting and recycling the gas.
2. In the utility model, the heat required by the calcination process is mainly self-circulation supply of high-temperature flue gas generated by calcination and decomposition, i.e. O is not introduced in the calcination process 2 And N 2 And the impurity components are equal, so that CO in the flue gas discharged after primary preheating 2 High concentration, further increase CO 2 Purity of the gaseous by-product.
3. In the utility model, a part of high-temperature flue gas generated by calcination is used for self-circulation to supply heat for calcination, and the other part of the high-temperature flue gas is used for primary preheating of raw materials, and the cooled high-temperature flue gas is used for secondary preheating of the raw materials, so that the high-efficiency utilization of flue gas waste heat is realized.
Drawings
FIG. 1 shows a zero CO system according to the present utility model 2 A schematic structural diagram of the discharged lime preparation system;
FIG. 2 shows another embodiment of the utility model with zero CO 2 A schematic structural diagram of the discharged lime preparation system;
FIG. 3 is a flow chart of a prior art lime production process.
Reference numerals:
1: a primary preheating device; 2: a secondary preheating device; 3: a calcining device; 4: a cooling device; 5: a preheating device; 6: lime kiln; 601: a preheating chamber; 602: a calcination chamber; 603: a cooling chamber; 701: a first heat compensator; 702: a second heat compensator; 801: a first flue gas diverter; 802: a second flue gas diverter; 901: first end product CO 2 A system; 902: second finished product CO 2 A system; 1001: a first finished lime system; 1002: a second finished lime system;
l1: a first pipe; l2: a second pipe; l3: a third conduit; l4: a fourth conduit; l5: a fifth pipe; l01: a first cooling air delivery duct; l02: and a second cooling air conveying pipeline.
Detailed Description
The following examples illustrate the technical aspects of the utility model, and the scope of the utility model claimed includes but is not limited to the following examples.
According to a first embodiment of the present utility model, there is provided a zero CO 2 A discharged lime preparation system.
Zero CO 2 The discharged lime preparation system comprises a primary preheating device 1, a secondary preheating device 2, a calcining device 3 and a cooling device 4. The discharge port of the primary preheating device 1 is connected to the feed port of the secondary preheating device 2. The discharge port of the secondary preheating device 2 is connected to the feed port of the calcining device 3. The discharge opening of the calcination device 3 is connected to the feed opening of the cooling device 4. Wherein the air outlet of the calcination device 3 is connected to the air inlet of the calcination device 3 via a first pipe L1. The second pipeline L2 is separated from the first pipeline L1 and is connected to the air inlet of the primary preheating device 1.
In the present utility model, the first cooling air supply duct L01 is connected to the air intake of the cooling device 4. The air outlet of the cooling device 4 is connected to the air inlet of the secondary preheating device 2 via a third pipe L3.
Preferably, the first heat compensator 701 is provided on the first pipe L1 downstream of the connection point between the second pipe L2 and the first pipe L1. Preferably, the first heat complement device 701 is a microwave heater or an electric heater.
Preferably, a first flue gas diverter 801 is provided at a position where the second duct L2 branches off from the first duct L1.
In the present utility model, the air outlet of the primary preheating device 1 is connected to the first finished product CO through a pipeline 2 The system 901. The outlet of the cooling device 4 is connected to a first finished lime system 1001.
According to a second embodiment of the utility model, a zero CO is provided 2 Lime production system for exhaustAnd (5) unifying.
Zero CO 2 A lime production system for exhaust, which system comprises a preheating device 5 and a lime kiln 6. The lime kiln 6 comprises a preheating chamber 601, a calcining chamber 602 and a cooling chamber 603 which are sequentially arranged from top to bottom. Wherein the preheating and cooling bores 601, 603 are arranged on the same vertical axis, and the calcining bore 602 is arranged offset from this axis. The discharge opening of the preheating device 5 is connected to the feed opening of the preheating chamber 601 of the lime kiln 6. The feed opening of the preheating chamber 601 is connected to the calcining chamber 602, and the feed opening of the calcining chamber 602 is connected to the cooling chamber 603. The upper part of the calcination chamber 602 is provided with a flue gas outlet and the lower part is provided with a flue gas inlet, and the flue gas outlet is connected to the flue gas inlet of the calcination chamber 602 via a fourth pipe L4. A fifth line L5 branches off from the fourth line L4 and is connected to the air intake of the preheating device 5.
In the present utility model, the second cooling air conveying duct L02 is connected to an air inlet of the cooling chamber 603 of the lime kiln 6. An air duct is provided between the preheating chamber 601 and the cooling chamber 603, and an air outlet of the cooling chamber 603 is connected to an air inlet of the preheating chamber 601 through the air duct.
Preferably, the second heat compensator 702 is provided on the fourth pipe L4 downstream of the connection point of the fifth pipe L5 and the fourth pipe L4. Preferably, the second heat compensator 702 is a microwave heater or an electric heater.
Preferably, a second flue gas diverter 802 is provided at the location of the fourth duct L4 where the fifth duct L5 branches off.
In the present utility model, the air outlet of the preheating device 5 is connected to the second finished product CO through a pipe 2 System 902. The outlet of the cooling chamber 603 of the lime kiln 6 is connected to a second product lime system 1002.
Example 1
As shown in fig. 1, a zero CO 2 The discharged lime preparation system comprises a primary preheating device 1, a secondary preheating device 2, a calcining device 3 and a cooling device 4. The discharge port of the primary preheating device 1 is connected to the feed port of the secondary preheating device 2. The discharge port of the secondary preheating device 2 is connected to the feed port of the calcining device 3. The discharge opening of the calcination device 3 is connected to the feed opening of the cooling device 4. Wherein, calcination deviceThe air outlet of the calcining device 3 is connected to the air inlet of the calcining device 3 via a first pipeline L1. The second pipeline L2 is separated from the first pipeline L1 and is connected to the air inlet of the primary preheating device 1.
Example 2
Example 1 was repeated except that the first cooling air supply duct L01 was connected to the air intake port of the cooling device 4. The air outlet of the cooling device 4 is connected to the air inlet of the secondary preheating device 2 via a third pipe L3.
Example 3
Example 2 was repeated except that the first heat compensator 701 was provided on the first pipe L1 downstream of the position where the second pipe L2 was connected to the first pipe L1. The first heat compensator 701 is a microwave heater.
Example 4
Example 2 was repeated except that the first heat compensator 701 was provided on the first pipe L1 downstream of the position where the second pipe L2 was connected to the first pipe L1. The first heat compensator 701 is an electric heater.
Example 5
Example 4 was repeated except that a first flue gas splitter 801 was provided at a position where the second duct L2 was branched off from the first duct L1.
Example 6
Example 5 was repeated except that the air outlet of the primary preheating device 1 was connected to the first finished CO by piping 2 The system 901. The outlet of the cooling device 4 is connected to a first finished lime system 1001.
Example 7
As shown in fig. 2, a zero CO 2 A lime production system for exhaust, which system comprises a preheating device 5 and a lime kiln 6. The lime kiln 6 comprises a preheating chamber 601, a calcining chamber 602 and a cooling chamber 603 which are sequentially arranged from top to bottom. Wherein the preheating chamber 601 and the cooling chamber 603 are arranged on a vertical axis of the lime kiln 6, and the calcination chamber 602 is arranged offset from the vertical axis. Specifically, an air duct is provided between the preheating chamber 601 and the cooling chamber 603, and the calcining chamber 602 is disposed around the periphery of the air duct with the vertical axis as the center. The discharge opening of the preheating device 5 is connected to the feed opening of the preheating chamber 601 of the lime kiln 6. The feed opening of the preheating chamber 601 is connected to the calcining chamber602, the feed opening of the calcination chamber 602 is connected to a cooling chamber 603. The upper part of the calcination chamber 602 is provided with a flue gas outlet and the lower part is provided with a flue gas inlet, and the flue gas outlet is connected to the flue gas inlet of the calcination chamber 602 via a fourth pipe L4. A fifth line L5 branches off from the fourth line L4 and is connected to the air intake of the preheating device 5.
Example 8
Example 7 is repeated except that the second cooling air conveying duct L02 is connected to the air inlet of the cooling chamber 603 of the lime kiln 6. An air duct is connected between the preheating chamber 601 and the cooling chamber 603, and an air outlet of the cooling chamber 603 is connected to an air inlet of the preheating chamber 601 through the air duct.
Example 9
Example 8 is repeated except that a second heat compensator 702 is provided on the fourth pipe L4 downstream of the connection point of the fifth pipe L5 and the fourth pipe L4. The second heat compensator 702 is a microwave heater.
Example 10
Example 9 is repeated except that the second heat compensator 702 is an electric heater.
Example 11
Example 9 is repeated except that a second flue gas splitter 802 is provided at a position where the fifth duct L5 is branched off from the fourth duct L4.
Example 12
Example 11 was repeated except that the air outlet of the preheating device 5 was connected to the second finished CO by a pipe 2 System 902. The outlet of the cooling chamber 603 of the lime kiln 6 is connected to a second product lime system 1002.
Claims (18)
1. Zero CO 2 The lime preparation system of emission, its characterized in that: the system comprises a primary preheating device (1), a secondary preheating device (2), a calcining device (3) and a cooling device (4); the discharge port of the primary preheating device (1) is connected to the feed port of the secondary preheating device (2); the discharge port of the secondary preheating device (2) is connected to the feed port of the calcining device (3); the discharge port of the calcining device (3) is connected to the feed port of the cooling device (4); wherein the air outlet of the calcining device (3) is connected to the air inlet of the calcining device (3) through a first pipeline (L1); from a first tubeThe second pipeline (L2) is separated from the pipeline (L1) and is connected to the air inlet of the primary preheating device (1).
2. A lime preparation system according to claim 1, wherein: the first cooling air conveying pipeline (L01) is connected to an air inlet of the cooling device (4); the air outlet of the cooling device (4) is connected to the air inlet of the secondary preheating device (2) through a third pipeline (L3).
3. Lime production system according to claim 1 or 2, characterized in that: a first heat compensator (701) is provided on the first pipe (L1) downstream of the connection position of the second pipe (L2) and the first pipe (L1).
4. A lime production system according to claim 3, wherein: the first heat complement device (701) is a microwave heater or an electric heater.
5. The lime production system according to any one of claims 1-2 and 4, wherein: a first flue gas splitter (801) is provided at a position where a second pipe (L2) is branched from the first pipe (L1).
6. A lime production system according to claim 3, wherein: a first flue gas splitter (801) is provided at a position where a second pipe (L2) is branched from the first pipe (L1).
7. The lime production system of any one of claims 1-2, 4, 6, wherein: the air outlet of the primary preheating device (1) is connected to the first finished product CO through a pipeline 2 A system (901); the outlet of the cooling device (4) is connected to the first finished lime system (1001).
8. A lime production system according to claim 3, wherein: the air outlet of the primary preheating device (1) is connected to the first finished product CO through a pipeline 2 A system (901); the outlet of the cooling device (4) is connected to a first finished lime system (1001)。
9. A lime preparation system according to claim 5, wherein: the air outlet of the primary preheating device (1) is connected to the first finished product CO through a pipeline 2 A system (901); the outlet of the cooling device (4) is connected to the first finished lime system (1001).
10. Zero CO 2 The lime preparation system of emission, its characterized in that: the system comprises a preheating device (5) and a lime kiln (6); the lime kiln (6) comprises a preheating chamber (601), a calcining chamber (602) and a cooling chamber (603) which are sequentially arranged from top to bottom; wherein the preheating chamber (601) and the cooling chamber (603) are arranged on the same vertical axis, and the calcining chamber (602) is arranged offset from the axis; the discharge port of the preheating device (5) is connected to the feed port of the preheating chamber (601) of the lime kiln (6); the feed opening of the preheating chamber (601) is connected to the calcining chamber (602), and the feed opening of the calcining chamber (602) is connected to the cooling chamber (603); a flue gas outlet is arranged at the upper part of the calcination chamber (602) and a flue gas inlet is arranged at the lower part of the calcination chamber, and the flue gas outlet is connected to the flue gas inlet of the calcination chamber (602) through a fourth pipeline (L4); a fifth pipeline (L5) is separated from the fourth pipeline (L4) and is connected to an air inlet of the preheating device (5).
11. A lime preparation system according to claim 10, wherein: the second cooling air conveying pipeline (L02) is connected to an air inlet of a cooling chamber (603) of the lime kiln (6); an air duct is arranged between the preheating chamber (601) and the cooling chamber (603), and an air outlet of the cooling chamber (603) is connected to an air inlet of the preheating chamber (601) through the air duct.
12. Lime production system according to claim 10 or 11, characterized in that: a second heat compensator (702) is arranged on the fourth pipeline (L4) and positioned at the downstream of the connection position of the fifth pipeline (L5) and the fourth pipeline (L4).
13. A lime preparation system according to claim 12, wherein: the second heat complement device (702) is a microwave heater or an electric heater.
14. Lime production system according to any of claims 10-11, 13, characterized in that: a second flue gas diverter (802) is arranged on the fourth pipeline (L4) at a position for separating the fifth pipeline (L5).
15. A lime preparation system according to claim 12, wherein: a second flue gas diverter (802) is arranged on the fourth pipeline (L4) at a position for separating the fifth pipeline (L5).
16. The lime preparation system of any one of claims 10-11, 13, 15, wherein: the air outlet of the preheating device (5) is connected to a second finished product CO through a pipeline 2 A system (902); the outlet of the cooling chamber (603) of the lime kiln (6) is connected to a second finished lime system (1002).
17. A lime preparation system according to claim 12, wherein: the air outlet of the preheating device (5) is connected to a second finished product CO through a pipeline 2 A system (902); the outlet of the cooling chamber (603) of the lime kiln (6) is connected to a second finished lime system (1002).
18. A lime preparation system according to claim 14, wherein: the air outlet of the preheating device (5) is connected to a second finished product CO through a pipeline 2 A system (902); the outlet of the cooling chamber (603) of the lime kiln (6) is connected to a second finished lime system (1002).
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| CN202321179402.3U CN220265584U (en) | 2023-05-16 | 2023-05-16 | Zero CO 2 Discharged lime preparation system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117886522A (en) * | 2024-03-15 | 2024-04-16 | 嘉峪关大友嘉镁钙业有限公司 | Limestone rotary kiln preheating device and application method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117886522A (en) * | 2024-03-15 | 2024-04-16 | 嘉峪关大友嘉镁钙业有限公司 | Limestone rotary kiln preheating device and application method thereof |
| CN117886522B (en) * | 2024-03-15 | 2024-05-07 | 嘉峪关大友嘉镁钙业有限公司 | Limestone rotary kiln preheating device and application method thereof |
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