CN214792493U - Lime production system - Google Patents
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- CN214792493U CN214792493U CN202120635972.3U CN202120635972U CN214792493U CN 214792493 U CN214792493 U CN 214792493U CN 202120635972 U CN202120635972 U CN 202120635972U CN 214792493 U CN214792493 U CN 214792493U
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Abstract
The embodiment of the utility model provides a lime production system, including rotary kiln system and high-temperature hot-blast stove system that provides high-temperature hot air for rotary kiln system, high-temperature hot-blast stove system locate outside rotary kiln system, and high-temperature hot-blast stove system with the rotary kiln system through the pipeline link to each other; the rotary kiln system mainly comprises a preheater, a roller kiln body and a cooler; the roller kiln body is provided with a high-temperature hot air input pipeline; the high-air-temperature hot blast stove system comprises a heat accumulating type hot blast stove set; the heat accumulating type hot blast stove group is provided with a high-temperature hot blast output pipeline; and a high-temperature hot air output pipeline of the heat accumulating type hot air furnace set is connected with a high-temperature hot air input pipeline of the roller kiln body. The high-temperature hot air has no flame, and can be controlled within a relatively stable temperature range, so that a relatively stable constant-temperature atmosphere is formed in the rotary kiln body, the constant-temperature atmosphere is more stable in calcination, and a high-grade lime finished product can be obtained.
Description
Technical Field
The utility model relates to a field is prepared to lime, concretely relates to lime production system.
Background
Lime, namely calcium oxide (CaO), is widely used in industries such as steel industry, calcium carbide industry, alumina industry, refractory material, etc., and is one of production raw materials necessary for such large-scale industrial fields, and for example, in metallurgical industry, about 70 to 150 kg of lime is required for producing 1 ton of steel. 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 burning is to decompose calcium carbonate in limestone into calcium oxide and carbon dioxide by means of high temperature. The basic reaction formula: CaCO3+42.5Kcal＝CaO+CO2
The lime preparation process mainly comprises preheating, calcining, cooling and discharging. The process method based on the existing lime preparation technology comprises the following steps: limestone and solid fuel are loaded into a lime kiln, or gas fuel is fed into a kiln body through a pipeline and a combustor for combustion while the limestone is loaded into the lime kiln, and the generated hot flue gas is used for calcining the limestone; the limestone is thermally decomposed according toThe published research data shows that the initial decomposition temperature of limestone in the combustion flue gas atmosphere is about 200 ℃ higher than the initial decomposition temperature in the air atmosphere; cooling the generated lime, discharging the lime out of the kiln, and decomposing the limestone to generate CO2And is discharged along with the flue gas.
The existing lime kiln is divided into the following components according to fuel: the method comprises a mixed combustion kiln (mainly burning solid fuels, including coke, coke powder, coal and the like) and a gas combustion kiln (mainly burning gas fuels, such as blast furnace gas, coke oven gas, converter gas, calcium carbide tail gas, generator gas, natural gas and the like), wherein the gas combustion kiln is more widely applied; dividing according to the shape of a kiln: there are ordinary shaft kiln, rotary kiln, sleeve kiln, parallel-flow heat accumulating type double-chamber shaft kiln (malz kiln, also called meiz kiln), francis kiln (italy), etc., among which the rotary kiln, sleeve kiln, malz kiln are widely used; according to the operation mode: there are negative pressure operation kilns (such as annular sleeve shaft kilns) and positive pressure operation kilns (such as rotary kilns and parallel-flow heat accumulating type double-chamber shaft kilns).
The rotary kiln is the only lime continuous production furnace kiln in a non-shaft kiln mode, and the lime rotary kiln technology has the following basic characteristics:
the main equipment of the lime rotary kiln calcining system comprises a vertical preheater, a rotary kiln (roller), a vertical cooler, a matched combustion device, a pulse bag type dust remover and the like, and can utilize 10-40 (or 10-50) mm fine-grained limestone. The yield of the lime rotary kiln is generally 100-800 t/d, high-calorific-value fuels (such as coke oven gas, high-coke mixed gas and calcium carbide tail gas) are generally used, and a coal powder burner is changed to use coal powder as the fuel.
The lime stone material is by the leading-in preheater body of pre-heater top feed bin through the unloading elephant trunk in, get into the pre-heater from the pre-heater bottom by the high temperature flue gas that the rotary kiln spreads into, preheat the material to more than 1000 ℃, the partial decomposition takes place for the lime stone, and by hydraulic push rod in proper order from the rotary kiln afterbody push into the rotary kiln cylinder, calcine into the lime finished product through high temperature flue gas in the rotary kiln cylinder, the lime finished product is unloaded into the cooler from the kiln head in, discharge the cooler after being cooled by the cold wind that the fan blew into in the cooler.
The kiln head burner sprays high-heat value fuel (such as coke oven gas and calcium carbide tail gas) and combustion-supporting air (primary air) for combustion, and waste cooling air is used as secondary air and enters the rotary kiln drum from the upper part of the cooler to participate in combustion. Calcining limestone in the roller by high-temperature flue gas generated after combustion of high-calorific-value gas fuel, then entering a preheater from the tail end of the roller, performing heat exchange with the limestone in the preheater, reducing the temperature to below 250 ℃, then entering a cyclone dust collector for primary dust collection, capturing large-particle dust, then entering a bag type dust collector, and exhausting the dust into the atmosphere by a high-temperature draught fan after dust collection. In implementing the present invention, the applicant has found that there are at least the following problems in the prior art: the rotary kiln needs to use high-calorific-value fuel (such as coke oven gas) or coal powder, and high-temperature long flame and high-temperature flue gas generated by burning high-calorific-value fuel (such as coke oven gas, high-coke mixed gas, coal powder and calcium carbide tail gas) calcine limestone, so that on one hand, nitrogen oxides in discharged flue gas exceed the standard, a pin removal device needs to be additionally arranged, the operation cost of the pin removal device is increased, and in addition, the lining of the rotary kiln adopting the high-temperature long flame is easy to damage, and the maintenance amount is large.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a lime production system adopts the high temperature hot-blast substitution high heat value fuel burning flue gas that does not have flame to calcine the lime stone, and high temperature hot-blast conduct heat carrier can be the air, also can be CO2Gas or other gas heat carriers, and high-temperature hot air can be controlled in a relatively stable temperature range, so that the constant-temperature atmosphere which is relatively stable is formed in the rotary kiln body, the constant-temperature atmosphere is more stable in calcination, not only can high-grade lime finished products be obtained, but also low-calorific-value fuel can be adopted, nitrogen oxides in discharged flue gas accord with environmental protection standards, the discharged flue gas is not required to be subjected to denitration treatment, in addition, the constant-temperature hot air replaces long flame, and the rotary kiln lining also has a certain protection effect.
In order to achieve the above object, in one aspect, an embodiment of the present invention provides a lime production system, including a rotary kiln system and a high-temperature hot-blast stove system for providing high-temperature hot air for the rotary kiln system, where the high-temperature hot-blast stove system is disposed outside the rotary kiln system, and the high-temperature hot-blast stove system is connected to the rotary kiln system through a pipeline; wherein:
the rotary kiln system mainly comprises a preheater, a roller kiln body and a cooler; wherein, a kiln head of the roller kiln body is provided with a high-temperature hot air input pipeline;
the high-air-temperature hot blast stove system comprises a heat accumulating type hot blast stove set; the heat accumulating type hot blast stove group is provided with a high-temperature hot blast output pipeline;
and a high-temperature hot air output pipeline of the heat accumulating type hot air furnace set is connected with a high-temperature hot air input pipeline of the roller kiln body.
Preferably, the heat accumulating type hot blast stove set comprises at least two heat accumulating type hot blast stoves, preferably three or four heat accumulating type hot blast stoves; the heat accumulating type hot blast stove is provided with a heat accumulating chamber and a heat accumulator arranged in the heat accumulating chamber for heat exchange, and is also provided with a gas input pipeline for conveying gas into the heat accumulating chamber;
the heat accumulating type hot blast stove is provided with a low-heat-value fuel inlet for receiving low-heat-value fuel and a burner connected with the low-heat-value fuel inlet, and the heat accumulating type hot blast stove is provided with a combustion air inlet for receiving combustion air, and the combustion air inlet is connected with the burner; heating a heat accumulator by using smoke generated by combustion of low-calorific-value fuel through combustion-supporting air in the combustor, and performing heat exchange between the heated heat accumulator and gas entering the heat accumulator to form high-temperature hot air from the gas in the heat accumulator;
the heat accumulating type hot blast stove is provided with a high-temperature hot blast outlet; the high-temperature hot air outlet is connected with the high-temperature hot air output pipeline.
Preferably, the regenerative hot blast stove set comprises three regenerative hot blast stoves.
Preferably, the regenerative hot blast stove group comprises four regenerative hot blast stoves.
Preferably, the heat accumulating type hot blast stove set is provided with a smoke discharge channel for discharging smoke generated by burning low-heating-value fuel;
the high-air-temperature hot blast stove system also comprises a hot blast stove flue gas heat exchanger, and the hot blast stove flue gas heat exchanger is connected with a flue gas discharge channel of the heat accumulating type hot blast stove set;
the hot blast stove flue gas heat exchanger is provided with a flue gas inlet, a flue gas outlet, a low-heat-value fuel inlet and a low-heat-value fuel outlet, the flue gas inlet of the hot blast stove flue gas heat exchanger is connected to a flue gas discharge channel of the heat accumulating type hot blast stove set, and the flue gas outlet of the hot blast stove flue gas heat exchanger is connected to a chimney; the low-calorific-value fuel outlet of the hot blast stove flue gas heat exchanger is connected with the heat accumulating type hot blast stove set;
the high-air-temperature hot blast stove system further comprises a fuel conveying device for providing low-heat-value fuel for the heat accumulating type hot blast stove set, wherein the fuel conveying device is a fuel conveying pipeline, the fuel conveying pipeline is connected to a low-heat-value fuel inlet of the hot blast stove flue gas heat exchanger, and the low-heat-value fuel is conveyed to the low-heat-value fuel inlet of the hot blast stove flue gas heat exchanger through the fuel conveying device.
Preferably, it is characterized in that:
the high-air-temperature hot blast stove system also comprises a high-temperature heat exchanger;
the cooler is provided with a cooling air extraction pipe which is connected with the high-temperature heat exchanger;
the high-temperature heat exchanger is provided with a combustion air inlet and a combustion air outlet, and the combustion air outlet is connected with the heat accumulating type hot blast stove set;
the high-air-temperature hot air furnace system further comprises a combustion-supporting fan, and the combustion-supporting fan inputs combustion-supporting air into a combustion-supporting air inlet of the high-temperature heat exchanger.
Preferably, the cooler has a cooling wind extraction pipe;
the lime production system also comprises a dust remover connected with the cooling air extraction pipe;
the high-air-temperature hot air furnace system further comprises a combustion fan, the combustion fan is connected with the dust remover, combustion air and cooling waste air from the cooling air extraction pipe are converged by the combustion fan and input to a combustion air inlet of the heat accumulating type hot air furnace set.
Preferably, the first and second electrodes are formed of a metal,the gas delivered into the heat storage chamber of the heat storage type hot blast stove is CO2The high-temperature hot air is high-temperature CO2Hot air;
the lime production system also comprises CO2Mixed flue gas collecting pipe and CO2Collecting system and method for collecting CO2The mixed flue gas is extracted from the upper part of the preheater by the draught fan;
the CO is2One end of the mixed flue gas collecting pipe is connected with the preheater and is used for conveying CO pumped out from the upper part of the preheater by the draught fan2Mixing the flue gas; the CO is2The other end of the mixed flue gas collecting pipe is connected with the CO2A collection system;
the CO is2The collecting system comprises a dust removing device and CO2Storage tank, and connection to CO2Storage tank connected CO2A recovery system, the dust removing device is respectively connected with the CO2A mixed flue gas collecting pipe and the CO2A storage tank;
the dust removal device is provided with an inlet end and an outlet end; the inlet end of the dust removing device is connected with the CO2The other end of the mixed flue gas collecting pipe is connected with the outlet end of the dust removing device to the CO2A storage tank.
Preferably, further comprising a carbon monoxide linked to said CO2The system comprises a circulating heat carrier conveying pipe of a storage tank and a circulating air draught fan arranged on the circulating heat carrier conveying pipe;
the CO is2The storage tank has an outlet end;
one end of the circulating heat carrier conveying pipe is connected with the CO2And the other end of the circulating heat carrier conveying pipe is connected with a gas input pipeline of the heat accumulating type hot blast stove.
Preferably, in said CO2A pressure increasing device is arranged in front of an inlet of the storage tank, a pressure reducing device and CO are arranged on the circulating heat carrier conveying pipe2The storage tank is a high-pressure storage tank, and the suitable pressure range is 0.5 Mpa-1.5 Mpa; preferably, the low heating value fuel is a low heating value gas fuel.
Preferably, the low heating value gas fuel comprises blast furnace gas.
The technical scheme has the following beneficial effects: the high-temperature hot air has no flame, and the high-temperature hot air can be controlled within a relatively stable temperature range, so that a relatively stable constant-temperature atmosphere is formed in the rotary kiln body, the constant-temperature atmosphere is more stably calcined, a high-grade lime finished product can be obtained, low-calorific-value fuel can be adopted, nitrogen oxides of discharged flue gas accord with environmental protection standards, the discharged flue gas is not required to be subjected to denitration treatment, in addition, the constant-temperature hot air replaces long flame, and a certain protection effect is realized on the rotary kiln lining.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic diagram of a lime production system according to an embodiment of the present invention;
fig. 2 is a schematic view of the working principle of a heat accumulating type hot blast stove of the embodiment of the invention;
FIG. 3 shows the use of CO according to an embodiment of the present invention2Schematic diagram of lime production system composition as heat carrier.
The reference numerals are represented as:
100. a roller kiln body; 200. a preheater; 210. CO22A mixed flue gas collecting pipe; 220. CO22A collection system; 230. a circulating heat carrier conveying pipe; 300. a cooler; 310. a cooling air extraction pipe; 400. a heat accumulating type hot blast stove set; 410. a flue gas heat exchanger of the hot blast stove; 420. a high temperature heat exchanger; 430. a high-temperature hot air output pipeline; 500. a chimney;
401. blast furnace gas; 402. combustion air.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
As shown in fig. 1-3, in combination with the embodiment of the present invention, a lime production system is provided, which includes a rotary kiln system and a high-temperature hot-air furnace system for providing high-temperature hot air for the rotary kiln system, wherein the high-temperature hot-air furnace system is disposed outside the rotary kiln system, and the high-temperature hot-air furnace system is connected to the rotary kiln system through a pipeline; other related corollary equipment is also included, such as: and a feeding device, an ash discharging device, an electric appliance and instrument control device, a fan and the like.
The rotary kiln system comprises a preheater 200, a roller kiln body 100 and a cooler 300 which are arranged in sequence from top to bottom; wherein, a kiln head of the roller kiln body 100 (rotary kiln) is provided with a high-temperature hot air input pipeline. The high blast temperature hot blast stove system comprises a heat accumulating type hot blast stove set 400; the heat accumulating type hot blast furnace stack 400 has a high temperature hot blast output duct 430;
and a high-temperature hot air output pipeline of the heat accumulating type hot air furnace group is connected with a high-temperature hot air input pipeline of the roller kiln body 100.
Limestone enters the preheater 200 from the upper part of the preheater 200, enters the roller kiln body 100 from the kiln tail of the roller kiln body 100 after being preheated, falls into the cooler 300 from the kiln head of the roller kiln body 100 after being calcined, and the cooling of a lime finished product adopts air as cooling gas; cooling air (cooling air) enters the cooler 300 from the cooling fan, and the cooling air and the high-temperature lime finished product complete heat exchange in the cooler 300 to cool the lime finished product; the cooled lime product is discharged from the lower portion of the cooler 300.
The high-temperature hot air has no flame, and the high-temperature hot air can be controlled within a relatively stable temperature range, so that a relatively stable constant temperature atmosphere is formed in the rotary kiln body 100, the constant temperature atmosphere is more stably calcined, a high-grade lime finished product can be obtained, the heat accumulating type hot air furnace set 400 can adopt low-calorific-value fuel, the nitrogen oxide of the discharged flue gas meets the environmental protection standard, the discharged flue gas does not need to be subjected to denitration treatment, in addition, the constant-temperature hot air replaces long flame, and a certain protection effect is also realized on the rotary kiln lining.
Preferably, the regenerative hot blast stove group 400 includes at least two regenerative hot blast stoves, which may be three or four, preferably three; wherein the regenerative hot blast stove is preferably a top-fired regenerative hot blast stove in the form of a regenerative hot blast stove with a burner above the dome of the stove.
The heat accumulating type hot blast stove is provided with a heat accumulating chamber and a heat accumulator arranged in the heat accumulating chamber and used for heat exchange, and the heat accumulating type hot blast stove is also provided with a gas input pipeline which is used for conveying gas into the heat accumulating chamber.
The heat accumulating type hot blast stove is provided with a low-heat-value fuel inlet for receiving low-heat-value fuel and a burner connected with the low-heat-value fuel inlet, and the heat accumulating type hot blast stove is provided with a combustion air inlet for receiving combustion air, and the combustion air inlet is connected with the burner; flue gas generated by combustion air and low-calorific-value fuel in the combustor enters a heat storage chamber of the hot blast stove to heat a heat accumulator in the heat storage chamber, the heated heat accumulator becomes a high-temperature heat accumulator, and then the high-temperature heat accumulator heats gas filled in the heat accumulator to form high-temperature hot air. Namely: during the burning period of the heat accumulating type hot blast stove, low-calorific-value fuel and combustion-supporting air enter a burner of the heat accumulating type hot blast stove to be burnt to generate high-temperature flue gas, and the high-temperature flue gas is used for heating a heat accumulator in a heat accumulating chamber; during the air supply period of the heat accumulating type hot blast stove, the high-temperature heat accumulator and the gas entering the heat accumulating chamber heat the gas entering the heat accumulating chamber in a heat exchange mode, and the gas (such as air or other gas) is heated to the temperature (becoming a heat carrier) required by the limestone calcining process.
The heat accumulating type hot blast stove is provided with a high-temperature hot blast outlet at the upper part of a heat accumulating chamber; the high-temperature hot air outlet is connected with the high-temperature hot air output pipeline 430, and the high-temperature hot air is used for calcining limestone in the roller kiln body 100. The heat accumulating type hot blast stove set can continuously provide constant-temperature and constant-pressure hot blast for the roller kiln body 100, and waste flue gas discharged by the heat accumulating type hot blast stove set is cooled by the heat exchanger and then directly discharged from the chimney 500.
Preferably, the heat accumulating type hot blast stove set 400 has a flue gas discharge passage connected to the burner for discharging flue gas generated by burning low heating value fuel;
the high blast temperature hot blast stove system further includes a hot blast stove flue gas heat exchanger 410, and the hot blast stove flue gas heat exchanger 410 is connected to a flue gas discharge passage of the heat accumulating type hot blast stove unit 400.
The hot blast stove flue gas heat exchanger 410 is provided with a flue gas inlet and a flue gas outlet, a low-heat value fuel inlet and a low-heat value fuel outlet, the flue gas inlet of the hot blast stove flue gas heat exchanger 410 is connected to the flue gas discharge channel of the heat accumulating type hot blast stove set 400, and the flue gas outlet of the hot blast stove flue gas heat exchanger 410 is connected to the chimney 500; the low heating value fuel outlet of the hot blast stove flue gas heat exchanger 410 is connected to the heat accumulating type hot blast stove set 400.
The high blast temperature hot blast stove system further includes a fuel feeding device (e.g., a gas pipe) for supplying a low calorific value fuel to the heat accumulating type hot blast stove group 400, and the fuel feeding device is further connected to the low calorific value fuel inlet of the hot blast stove flue gas heat exchanger 410, and feeds the low calorific value fuel to the low calorific value fuel inlet of the hot blast stove flue gas heat exchanger 410 through the fuel feeding device.
The flue gas discharged from the flue gas discharge channel of the heat accumulating type hot air furnace set 400 is input into the hot air furnace flue gas heat exchanger 410 through the flue gas inlet of the hot air furnace flue gas heat exchanger 410, and is used for preheating the low-calorific-value fuel.
The low-heat-value fuel is conveyed to a low-heat-value fuel inlet of the hot blast stove flue gas heat exchanger 410 through a fuel conveying device, the low-heat-value fuel is input into the hot blast stove flue gas heat exchanger 410 from the low-heat-value fuel inlet of the hot blast stove flue gas heat exchanger 410, the low-heat-value fuel in the hot blast stove flue gas heat exchanger 410 is preheated through the flue gas discharged by a heat accumulating type hot blast stove, and the preheated low-heat-value fuel is discharged into the heat accumulating type hot blast stove group 400 from a low-heat-value fuel outlet of the hot blast stove flue gas heat exchanger 410.
The high-air-temperature hot blast stove system also comprises a high-temperature heat exchanger 420; the cooler 300 is provided with a cooling air extraction pipe 310, and the cooling air extraction pipe 310 is connected with the high-temperature heat exchanger 420; the high temperature heat exchanger 420 has a combustion air inlet and a combustion air outlet, and the combustion air outlet is connected to the heat accumulating type hot blast stove unit 400; the high air temperature hot air furnace system further comprises a combustion fan, and the combustion fan inputs combustion air into a combustion air inlet of the high temperature heat exchanger 420. The cooling waste air after cooling the finished lime is extracted from the cooler 300, and the extracted cooling waste air is delivered into the high-temperature heat exchanger 420 through the cooling air extraction pipe 310 of the cooler 300 for preheating the combustion air.
The heat accumulating type hot blast stove set utilizes preheated combustion air and preheated low-heat-value fuel to burn the stove, so that the fuel consumption of the heat accumulating type hot blast stove set can be reduced, the combustion temperature can be increased, and the hot blast stove set can output high-temperature hot air.
Preferably, the cooling waste air from the cooling air extraction pipe 310 is dedusted and then merged with the combustion air from the combustion fan, and the heated combustion air enters the heat accumulating type hot blast stove set 400 to be mixed and combusted with the preheated low-calorific-value fuel, so that the heat energy utilization rate is improved. Namely: the cooler has a cooling air extraction pipe 310; the lime production system further comprises a dust remover connected with the cooling air extraction pipe 310; the high air temperature hot air furnace system further comprises a combustion fan, the combustion fan is connected with the dust remover, combustion air and cooling waste air from the cooling air extraction pipe are converged by the combustion fan and input to a combustion air inlet of the heat accumulating type hot air furnace unit 400.
Preferably, the gas conveyed into the heat storage chamber of the heat accumulating type hot blast stove is air, and the formed high-temperature hot air is high-temperature hot air; high-temperature hot air enters the roller kiln body 100 from the kiln head of the roller kiln body 100 through the high-temperature hot air output pipeline 430, and the limestone mineral aggregate is calcined through the high-temperature hot air, so that the decomposition temperature of limestone can be reduced. Can reduce fuel consumption, does not need to be detached, and has the effect of protecting the lining of the rotary kiln.
Preferably, the gas delivered to the heat accumulator of the regenerative hot blast stove is CO2The high-temperature hot air is high-temperature CO2Hot air; high temperature CO2Hot air enters the kiln head of the roller kiln body 100 from the kiln head of the roller kiln body 100 through the high-temperature hot air output pipeline 430 and passes through high-temperature CO2Calcining limestone ore materials by hot air; calcination decomposition of limestone mineral aggregate to produce CO2CO produced by decomposition of limestone2With heat carrier CO2Mixing hot air, entering rotary kiln preheater 200 from the tail of rotary kiln body 100, preheating limestone mineral aggregate of preheater, and cooling CO2The mixed flue gas exits the preheater 200 from the upper portion of the preheater 200.
The lime production system also comprises CO2Mixed flue gas collecting pipe 210 and CO2Collecting system 220, and CO2And the mixed flue gas is extracted from the upper part of the preheater 200.
The CO is2One end of the mixed flue gas collecting pipe 210 is connected with the preheater 200 and is used for conveying CO pumped out from the upper part of the preheater 200 by the induced draft fan2Mixing the flue gas; the CO is2The other end of the mixed flue gas collecting pipe 210 is connected to the CO2 A collection system 220.
The CO is2The collection system 220 comprises a dust removal device and CO2Storage tank, and CO connected to CO2 storage tank2A recovery system, the dust removing device is respectively connected with the CO2Mixed flue gasCollecting pipe 210 and the CO2A storage tank;
the dust removal device is provided with an inlet end and an outlet end; the inlet end of the dust removing device is connected with the CO2The other end of the mixed flue gas collecting pipe 210, and the outlet end of the dust removing device are connected with the CO2A storage tank.
The CO is2A recovery system connected at one end to the CO2A storage tank with another end connected with CO2And (5) connecting the later utilized processes.
The lime production system further comprises a gas inlet connected to the CO2A circulating heat carrier conveying pipe 230 of the storage tank and a circulating air induced draft fan arranged on the circulating heat carrier conveying pipe 230. The CO is2The storage tank has an outlet end; one end of the circulating heat carrier delivery pipe 230 is connected to the CO2And the outlet end of the storage tank and the other end of the circulating heat carrier conveying pipe 230 are connected with a gas input pipeline of the heat accumulating type hot blast stove.
After the preheater 200 preheats limestone, CO2The mixed flue gas is discharged to CO from the upper part of the preheater 2002The mixed flue gas is collected in the pipe 210 and then discharged to CO2A storage tank; in the introduction of CO2For the part of CO before storage in the tank2The mixed flue gas is subjected to dust removal treatment, so that high-purity CO can be obtained2，CO2Part of the high purity CO in the storage tank2Into CO2The recovery system can be finally used for producing chemical fertilizers or used in steel factories to replace other industrial gases and realize CO2And (5) emission reduction. Another part of CO2The mixed flue gas is used as a circulating heat carrier, passes through a circulating heat carrier delivery pipe 230, enters the heat accumulating type hot blast stove group 400 under the action of a circulating air induced draft fan, and is charged into a heat accumulating chamber of the heat accumulating type hot blast stove as the heat carrier.
CO2The gas is used as a heat carrier to calcine limestone, and the most important effect is that high-purity CO can be recovered at low cost2The carbon emission reduction is realized, high-quality lime can be obtained, and the productivity is not reduced.
Preferably, inThe CO is2A pressure increasing device is arranged in front of an inlet of the storage tank, a pressure reducing device and CO are arranged on the circulating heat carrier conveying pipe2The storage tank is a high-pressure storage tank, and the suitable pressure range is 0.5 Mpa-1.5 Mpa;
preferably, the low heating value fuel is a low heating value gas fuel; the low-heat value gas fuel comprises blast furnace gas, and the heat value is generally 650-800 kcal/nm3。
Blast furnace gas is adopted to replace high-calorific-value fuel (coke oven gas or high-coke mixed gas), because the blast furnace gas does not contain nitrogen oxide, the heat accumulating type hot blast stove can ensure that the discharged flue gas meets the emission standard of the nitrogen oxide by controlling the combustion temperature, so that the flue gas generated by the combustion of the blast furnace gas does not need to be subjected to denitration treatment, the process equipment investment is reduced, the operation cost is reduced, and the environmental protection cost is greatly reduced. In summary, the gas from the fan enters the heat accumulating type hot air furnace unit 400, is heated to 1250-1300 ℃ by the heat accumulator and then is discharged, and enters the high temperature hot air output pipeline 430, one end of the high temperature hot air output pipeline 430 is connected with the heat accumulating type hot air furnace unit 400, the other end of the high temperature hot air output pipeline 430 is connected to the kiln head of the rotary kiln body 100 of the rotary kiln system, and the high temperature hot air enters the rotary kiln body 100 through the high temperature hot air output pipeline 430, and the limestone is calcined in the rotary kiln body 100 through the high temperature hot air. The flue gas waste heat utilization equipment of the heat accumulating type hot blast stove set is a hot blast stove flue gas heat exchanger 410, the hot blast stove flue gas heat exchanger 410 receives flue gas generated by combustion of low-calorific-value fuel, and the hot blast stove flue gas heat exchanger 410 preheats the low-calorific-value fuel through the flue gas waste heat.
The high-temperature hot blast stove system is also provided with a high-temperature heat exchanger 420, wherein the high-temperature heat exchanger 420 is used for receiving high-temperature waste cooling air (subjected to primary dust removal) extracted from the cooler 300 to preheat combustion air, or collecting the high-temperature waste cooling air and the combustion air after dust removal, and then conveying the high-temperature waste cooling air and the combustion air into the heat accumulating type hot blast stove 400, so that the effect of reducing the fuel consumption of the hot blast stove is achieved.
Corresponding to the lime production system of the utility model, the utility model also provides a lime production method, which adopts the rotary kiln system and the high-blast-temperature hot blast stove system connected with the rotary kiln system to jointly finish the calcination of the limestone; the rotary kiln system comprises a preheater 200, a roller kiln body 100 (rotary kiln) and a cooler 300; the high-air-temperature hot air furnace system is arranged outside the rotary kiln system and is used for providing high-temperature hot air required by the calcination of limestone for the rotary kiln system; the high-air-temperature hot blast stove system comprises a heat accumulating type hot blast stove set 400, wherein the heat accumulating type hot blast stove set 400 is used for providing high-temperature hot air required by the calcination of limestone; wherein:
the lime production method comprises the following steps:
the limestone enters the preheater 200 from the upper part of the preheater 200, and the limestone is preheated in the preheater 200;
the preheated limestone is conveyed into the roller kiln body 100 from the tail part of the roller kiln body 100; a high-temperature hot air input pipeline for conveying high-temperature hot air to the rotary kiln body 100 through a high-temperature hot air output pipeline of the heat accumulating type hot air furnace group; high-temperature hot air enters the roller kiln body 100, and the limestone is calcined in the process of rolling the limestone to obtain a finished lime product;
outputting the lime finished product from the kiln head of the roller kiln body 100, falling into the cooler 300, and cooling the finished lime product to a preset temperature range in the cooler 300;
and discharging the cooled lime finished product from the cooler 300.
Preferably, the method comprises the following steps:
the heat accumulating type hot blast stove set 400 is provided with at least two heat accumulating type hot blast stoves, preferably three or four heat accumulating type hot blast stoves.
The gas is conveyed into a heat storage chamber of the heat storage type hot blast stove through a gas input pipeline.
The heat accumulating type hot blast stove is provided with a low-heating-value fuel inlet for receiving low-heating-value fuel and inputting the low-heating-value fuel to a burner of the heat accumulating type hot blast stove.
And receiving combustion-supporting air through a combustion-supporting air inlet of the heat accumulating type hot blast stove, and inputting the combustion-supporting air into a burner of the heat accumulating type hot blast stove.
Combustion air and low calorific value fuel are combusted in the combustor to generate flue gas.
The flue gas generated by the burner is used for heating a heat accumulator in a heat accumulation chamber of the heat accumulation type hot blast stove, then the gas entering the heat accumulation chamber is heated by the heat accumulator with high temperature, and the heated gas is high-temperature hot air.
High-temperature hot air is conveyed to a high-temperature hot air output pipeline 430 from a high-temperature hot air outlet of the heat accumulating type hot air furnace.
Preferably, the method comprises the following steps:
inputting the flue gas discharged from the flue gas discharge channel of the heat accumulating type hot blast furnace set 400 into the hot blast furnace flue gas heat exchanger 410 through the flue gas inlet of the hot blast furnace flue gas heat exchanger 410; wherein, the hot blast stove flue gas heat exchanger 410 is arranged in the high wind temperature hot blast stove system.
The low-heat value fuel is conveyed through a fuel conveying pipeline, conveyed to a low-heat value fuel inlet of the hot blast stove flue gas heat exchanger 410 and input into the hot blast stove flue gas heat exchanger 410 from the low-heat value fuel inlet of the hot blast stove flue gas heat exchanger 410.
Preheating low-heating-value fuel in a flue gas heat exchanger 410 of a hot blast stove, and discharging the preheated low-heating-value fuel into the heat accumulating type hot blast stove set 400 from a low-heating-value fuel outlet of the flue gas heat exchanger 410 of the hot blast stove; and the flue gas preheated by the low-heating-value fuel is discharged into a chimney 500 through a smoke outlet of a flue gas heat exchanger 410 of the hot blast stove.
Extracting cooling waste air after cooling finished lime from the cooler 300, and conveying the extracted cooling waste air into a high-temperature heat exchanger 420 through a cooling air extracting pipe 310 of the cooler 300, wherein the high-temperature heat exchanger 420 belongs to a high-air-temperature hot blast stove system;
combustion air from a combustion fan enters the high-temperature heat exchanger 420 through a combustion air inlet of the high-temperature heat exchanger 420, and the combustion air is preheated by cooling waste air;
the preheated combustion air is discharged into the heat accumulating type hot blast stove unit 400 through a combustion air outlet of the high temperature heat exchanger 420.
Preferably, the high-temperature cooling waste air is dedusted, then is mixed with combustion air, and is conveyed into the heat accumulating type hot blast stove 400.
Preferably, the gas delivered into the hot storage chamber of the regenerative hot blast stove is air.
Preferably, the gas delivered to the hot storage chamber of the regenerative hot blast stove is CO2The high-temperature hot air is high-temperature CO2Hot air;
production and recovery of CO from said lime2The method of (1), comprising:
introducing the CO into a reaction vessel2One end of the mixed flue gas collecting pipe 210 is connected with the preheater 200, and CO pumped out of the preheater 200 is collected by a draught fan2Mixed flue gas delivery to the CO2The mixed flue gas collection pipe 210.
Introducing CO2A collection system 220 is connected to the CO2A mixed flue gas collecting pipe 210 for receiving the CO2CO conveyed by the mixed flue gas collection pipe 2102Mixing the flue gas.
CO2The collection system 220 is provided with a dust removal device and CO2Storage tank and connection to CO2Storage tank connected CO2A recovery system for receiving CO through the inlet end of the dust-removing device2Mixing flue gas, and removing CO by dust collector2Dedusting the mixed flue gas, and removing the dedusted CO2The mixed flue gas enters into CO from the outlet end of the dust removal device2A storage tank; introducing CO2The outlet end of the storage tank is connected with CO2Recovery system by CO2The outlet end of the storage tank is used for discharging CO2CO of storage tank2Transport to CO2And (4) recovering the system.
The lime production method further comprises the following steps:
is arranged to be connected to CO2A circulating heat carrier conveying pipe 230 of the storage tank and a circulating air draught fan arranged on the circulating heat carrier conveying pipe 230.
One end of a circulating heat carrier delivery pipe 230 is connected to the CO2The outlet end of the storage tank connects the other end of the circulating heat carrier delivery pipe 230 to the gas input pipe of the heat accumulating type hot blast stoveAnd (4) carrying out the following steps.
Through circulating heat carrier delivery pipe 230, through circulating air induced draft fan is from CO2Part of CO after dust removal is pumped out of the storage tank2Mixing the flue gas, and delivering to gas input pipeline of the heat accumulating type hot blast stove, wherein the CO is part of the mixed flue gas2The mixed flue gas is used to be conveyed into the heat storage chamber.
Preferably, the method comprises the following steps:
taking low-heat value gas fuel as low-heat value fuel of a heat accumulating type hot blast stove, and generating high-temperature flue gas by mixed combustion of combustion-supporting air and the low-heat value gas fuel in the heat accumulating type hot blast stove; wherein the low heating value gas fuel comprises blast furnace gas.
To sum up, the utility model discloses a lime production system and method can adopt low heat value fuel combustion heating heat carrier, and the heat carrier can be air, also can be CO2。
Limestone enters the preheater 200 from the top of the preheater 200, enters the rotary kiln body 100 of the rotary kiln system after being preheated, is calcined by high-temperature hot air in the rotary kiln body 100 to generate a lime finished product, the lime finished product is discharged into the cooler 300 from the kiln head of the rotary kiln body 100, and the lime finished product is discharged out of the cooler 300 after being cooled by air.
The firing period of the regenerative hot air furnace group 400: the preheated low-calorific-value fuel (such as blast furnace gas 401) and combustion air 402 enter a burner of the heat accumulating type hot blast furnace set 400 for burning, waste flue gas generated by burning is discharged from the lower part of the heat accumulating type hot blast furnace set 400 and enters a hot blast furnace flue gas heat exchanger 410, and the waste flue gas is cooled after preheating the low-calorific-value fuel and then is discharged into a chimney 500 for discharging.
Air supply period of the regenerative hot air furnace group 400: the gas as a heat carrier is input to the regenerative chambers of the regenerative hot blast heater group 400. Wherein the gas as the heat carrier may be air; or with CO2As heat carrier, when CO is used2When used as a heat carrier, the preheater 200 and CO are required2Mixed flue gas collecting pipe 210 and CO2The collection system 220, the circulating heat carrier delivery pipe 230 and the circulating air induced draft fan partially remove dust of CO2Mixed flue gas is input into heat accumulating type hot airThe regenerators of the furnace battery 400. Low-temperature CO as circulating air is conveyed through circulating heat carrier conveying pipe 2302Inputting into a heat accumulating type hot blast furnace set 400, and heating by a heat accumulator to obtain CO2Hot air is discharged from the upper part of the regenerative hot air furnace unit and enters a high-temperature hot air output pipeline 430, one end of the high-temperature hot air output pipeline 430 is connected with the regenerative hot air furnace unit 400, and the other end is connected to the head of the roller kiln body 100.
When the high-temperature hot air is CO2When hot wind passes through CO2The hot air calcines the limestone in the roller kiln body 100, and the CO generated by the decomposition of the limestone2Combined to form CO2The mixed flue gas enters the preheater 200 through the tail of the roller kiln body 100, and the CO entering the preheater 2002The mixed flue gas preheats the limestone ore charge newly entering the preheater 200, and then CO2The mixed flue gas is cooled and discharged from the upper part of the preheater 200 and enters into CO2Mixed flue gas collecting pipe 210 in CO2After the collection system 220 is dedusted, a portion of the gas enters the CO2Recovery system to obtain high purity CO2The other part of the CO gas as a circulating heat carrier gas enters a circulating heat carrier delivery pipe 230, a circulating air induced draft fan is arranged on the circulating heat carrier delivery pipe 230, the other end of the circulating heat carrier delivery pipe 230 is connected with a heat accumulating type hot air furnace set 400, and the CO gas is used for introducing CO into the heat accumulating type hot air furnace set2The circulating air is conveyed into a heat storage chamber of the heat storage type hot blast stove.
The exhaust cooling air generated by the cooler 300 is drawn out of the cooler 300 and is mixed with CO in the interior of the rotary kiln body 1002And (4) isolating hot air.
Preferably, in said CO2A pressure increasing device is arranged in front of an inlet of the storage tank, a pressure reducing device and CO are arranged on the circulating heat carrier conveying pipe2The storage tank is a high-pressure storage tank, and the suitable pressure range is 0.5 Mpa-1.5 Mpa;
the utility model discloses the beneficial effect who gains as follows:
1. using hot air or CO without flame, at constant and adjustable temperature2The hot air is input into the roller kiln body from the roller kiln head to calcine the limestone mineral aggregate, so that the low-temperature section of the kiln head can be weakened or shortened. Therefore, the calcination time can also be shortened,or the aim of increasing the yield can be achieved under the condition of not increasing the volume of the kiln body.
2. Using hot air or CO at constant temperature without flame2The limestone mineral aggregate is calcined by hot air, so that the high-temperature impact of the calcining section is reduced, the protection of the refractory material in the roller kiln body is facilitated, and the maintenance cost of the rotary kiln lining is reduced.
3. Compared with the method that coke oven gas or coal powder is used as fuel, the low-nitrogen combustion process of the blast furnace gas ensures that the emission of nitrogen oxides reaches the standard, and no pin removal facility needs to be added to the rotary kiln system, thereby reducing the environmental protection cost and simultaneously reducing the fuel cost.
4. Using CO2Can recover high-purity CO when used as a circulating heat carrier2On the one hand CO is achieved2Emission reduction of high purity CO2Can also be used for producing chemical fertilizers or applied to other process fields in steel factories, equivalently provides byproducts with high added values for a lime kiln system, and improves the economic benefit of the utility model.
5. The utility model provides a process method for providing heat energy for a lime rotary kiln process by adopting a heat accumulating type hot blast furnace set, which uses blast furnace gas with lower calorific value as fuel and continuously provides constant-temperature and constant-pressure hot air for the lime rotary kiln, and substantially replaces coke oven gas with high price or other high calorific value fuels;
the utility model discloses cancelled the internal combustor of prior art rotary kiln, used low heat value fuel (blast furnace gas) as fuel, through hot-blast furnace heating heat carrier continuously for the rotary kiln system provides constant temperature constant voltage hot-blast, improved lime quality. Compared with various existing lime kiln technologies, the low-calorific-value fuel replaces expensive coke oven gas or other high-calorific-value fuels, the running cost of the lime kiln is greatly reduced, and particularly the investment of tail gas denitration equipment and the denitration running cost are reduced.
The present invention relates to a lime rotary kiln, and more particularly to a lime rotary kiln, which is used for the realization of lime rotary kilns, and the lime rotary kiln is characterized in that the lime rotary kiln is a rotary kiln, and the lime rotary kiln is a rotary kiln.
In the foregoing detailed description, various features are grouped together in a single embodiment for the purpose of streamlining the disclosure. This method of disclosure is not to be interpreted as reflecting an intention that the claimed embodiments of the subject matter require more features than are expressly recited in each claim. Rather, as the following claims reflect, the invention lies in less than all features of a single disclosed embodiment. Thus, the following claims are hereby expressly incorporated into the detailed description, with each claim standing on its own as a separate preferred embodiment of the invention.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. To those skilled in the art; various modifications to these embodiments will be readily apparent, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the disclosure. Thus, the present disclosure is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
What has been described above includes examples of one or more embodiments. It is, of course, not possible to describe every conceivable combination of components or methodologies for purposes of describing the aforementioned embodiments, but one of ordinary skill in the art may recognize that many further combinations and permutations of various embodiments are possible. Accordingly, the embodiments described herein are intended to embrace all such alterations, modifications and variations that fall within the scope of the appended claims. Furthermore, to the extent that the term "includes" is used in either the detailed description or the claims, such term is intended to be inclusive in a manner similar to the term "comprising" as "comprising" is interpreted when employed as a transitional word in a claim. Furthermore, any use of the term "or" in the specification of the claims is intended to mean a "non-exclusive or".
The above-mentioned embodiments, further detailed description of the objects, technical solutions and advantages of the present invention, it should be understood that the above description is only the embodiments of the present invention, and is not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A lime production system is characterized by comprising a rotary kiln system and a high-air-temperature hot blast stove system for providing high-temperature hot blast for the rotary kiln system, wherein the high-air-temperature hot blast stove system is arranged outside the rotary kiln system and is connected with the rotary kiln system through a pipeline; wherein:
the rotary kiln system comprises a preheater (200), a roller kiln body (100) and a cooler (300); wherein the roller kiln body (100) is provided with a high-temperature hot air input pipeline;
the high-air-temperature hot blast stove system comprises a heat accumulating type hot blast stove set (400); the heat accumulating type hot blast stove group (400) is provided with a high-temperature hot blast output pipeline (430);
and a high-temperature hot air output pipeline of the heat accumulating type hot air furnace set is connected with a high-temperature hot air input pipeline of the roller kiln body (100).
2. The lime production system according to claim 1, wherein the regenerative hot blast stove group (400) comprises at least two regenerative hot blast stoves; the heat accumulating type hot blast stove is provided with a heat accumulating chamber and a heat accumulator arranged in the heat accumulating chamber for heat exchange, and is also provided with a gas input pipeline for conveying gas into the heat accumulating chamber;
the heat accumulating type hot blast stove is provided with a low-heat-value fuel inlet for receiving low-heat-value fuel and a burner connected with the low-heat-value fuel inlet, and the heat accumulating type hot blast stove is provided with a combustion air inlet for receiving combustion air, and the combustion air inlet is connected with the burner; heating a heat accumulator by using smoke generated by combustion of low-calorific-value fuel through combustion-supporting air in the combustor, and performing heat exchange between the heated heat accumulator and gas entering the heat accumulator to form high-temperature hot air from the gas in the heat accumulator;
the heat accumulating type hot blast stove is provided with a high-temperature hot blast outlet; the high-temperature hot air outlet is connected with the high-temperature hot air output pipeline (430);
wherein, the heat accumulating type hot blast stove group (400) comprises three or four heat accumulating type hot blast stoves.
3. The lime production system of claim 2, wherein the regenerative hot blast stove group (400) comprises three regenerative hot blast stoves, or wherein the regenerative hot blast stove group (400) comprises four regenerative hot blast stoves.
4. The lime production system according to claim 2, wherein the regenerative hot blast furnace stack (400) has a flue gas discharge passage discharging flue gas generated by combustion of low heating value fuel;
the high-air-temperature hot blast stove system further comprises a hot blast stove flue gas heat exchanger (410), and the hot blast stove flue gas heat exchanger (410) is connected to a flue gas discharge channel of the heat accumulating type hot blast stove set (400);
the hot blast stove flue gas heat exchanger (410) is provided with a flue gas inlet, a flue gas outlet, a low-heat-value fuel inlet and a low-heat-value fuel outlet, the flue gas inlet of the hot blast stove flue gas heat exchanger (410) is connected to a flue gas discharge channel of the heat accumulating type hot blast stove set (400), and the flue gas outlet of the hot blast stove flue gas heat exchanger (410) is connected to a chimney (500); the low-heating-value fuel outlet of the hot blast stove flue gas heat exchanger (410) is connected with the heat accumulating type hot blast stove set (400);
the high-air-temperature hot blast stove system further comprises a fuel conveying device for providing low-heat-value fuel for the heat accumulating type hot blast stove set (400), wherein the fuel conveying device is a fuel conveying pipeline, the fuel conveying pipeline is connected to a low-heat-value fuel inlet of the hot blast stove flue gas heat exchanger (410), and the low-heat-value fuel is conveyed to the low-heat-value fuel inlet of the hot blast stove flue gas heat exchanger (410) through the fuel conveying device.
5. The lime production system of claim 4, wherein:
the high-air-temperature hot blast stove system also comprises a high-temperature heat exchanger (420);
the cooler (300) is provided with a cooling air extraction pipe (310), and the cooling air extraction pipe (310) is connected with the high-temperature heat exchanger (420);
the high-temperature heat exchanger (420) is provided with a combustion air inlet and a combustion air outlet, and the combustion air outlet is connected with the heat accumulating type hot blast stove set (400);
the high-air-temperature hot air furnace system further comprises a combustion fan, and the combustion fan inputs combustion air into a combustion air inlet of the high-temperature heat exchanger (420).
6. The lime production system of claim 2, wherein the cooler has a cooling air extraction pipe (310);
the lime production system also comprises a dust remover connected with the cooling air extraction pipe (310);
the high-air-temperature hot blast stove system further comprises a combustion fan, the combustion fan is connected with the dust remover, combustion air and cooling waste air from the cooling air extraction pipe are converged by the combustion fan and input to a combustion air inlet of the heat accumulating type hot blast stove set (400).
7. The lime production system of claim 2, wherein the gas delivered into the hot storage chamber of the regenerative hot blast stove is CO2The high-temperature hot air is high-temperature CO2Hot air;
the lime production system also comprises CO2Mixed flue gas collecting pipe (210), CO2Collecting system (220) and mixing CO2The mixed flue gas is extracted from the upper part of the preheater (200);
the CO is2One end of the mixed flue gas collecting pipe (210) is connected with the preheater (200) and is used for conveying CO pumped out from the upper part of the preheater (200) by the induced draft fan2Mixing the flue gas; the CO is2The other end of the mixed flue gas collecting pipe (210) is connected with the CO2A collection system (220);
the CO is2The collection system (220) comprises a dust removal device and CO2Storage tank, and connection to CO2Storage tank connected CO2A recovery system, the dust removing device is respectively connected with the CO2A mixed flue gas collection tube (210) and the CO2A storage tank;
the dust removal device is provided with an inlet end and an outlet end; the inlet end of the dust removing device is connected with the CO2The other end of the mixed flue gas collecting pipe (210) and the outlet end of the dust removing device are connected with the CO2A storage tank.
8. The lime production system of claim 7, further comprising a connection to the CO2The system comprises a circulating heat carrier conveying pipe (230) of a storage tank and a circulating air draught fan arranged on the circulating heat carrier conveying pipe (230);
the CO is2The storage tank has an outlet end;
one end of the circulating heat carrier conveying pipe (230) is connected with the CO2The other end of the circulating heat carrier conveying pipe (230) is connected with a gas input pipeline of the heat accumulating type hot blast stove;
the lime production system still includes: in the CO2CO is arranged between the storage tank and the dust removal device2A pressure increasing device, and a pressure reducing device is arranged on the circulating heat carrier conveying pipe (230); the CO is2The storage tank is a high pressure storage tank, the CO2The pressure range of the storage tank is 0.5 MPa-1.5 MPa.
9. The lime production system of claim 2, wherein the low heating value fuel is a low heating value gas fuel.
10. The lime production system of claim 9, wherein the low heating value gas fuel comprises blast furnace gas.
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| CN202120635972.3U CN214792493U (en) | 2021-03-29 | 2021-03-29 | Lime production system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114105499A (en) * | 2021-11-21 | 2022-03-01 | 石家庄新华能源环保科技股份有限公司 | Self-heat-storage double-chamber kiln |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114105499A (en) * | 2021-11-21 | 2022-03-01 | 石家庄新华能源环保科技股份有限公司 | Self-heat-storage double-chamber kiln |
| CN114105499B (en) * | 2021-11-21 | 2023-08-15 | 石家庄新华能源环保科技股份有限公司 | Self-heat-storage double-hearth kiln |
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