CN115585028A - Energy-saving rotary kiln oxygen-enriched combustion system - Google Patents

Energy-saving rotary kiln oxygen-enriched combustion system Download PDF

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Publication number
CN115585028A
CN115585028A CN202211374140.6A CN202211374140A CN115585028A CN 115585028 A CN115585028 A CN 115585028A CN 202211374140 A CN202211374140 A CN 202211374140A CN 115585028 A CN115585028 A CN 115585028A
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China
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oxygen
gas
enriched
rotary kiln
kiln
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CN202211374140.6A
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Chinese (zh)
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汪卫平
钱厚云
吕鸿惠
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Hangzhou Boman Fluid Industry Co ltd
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Hangzhou Boman Fluid Industry Co ltd
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Priority to CN202211374140.6A priority Critical patent/CN115585028A/en
Publication of CN115585028A publication Critical patent/CN115585028A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K11/00—Plants characterised by the engines being structurally combined with boilers or condensers
    • F01K11/02—Plants characterised by the engines being structurally combined with boilers or condensers the engines being turbines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
    • F01D15/08—Adaptations for driving, or combinations with, pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
    • F01D15/10—Adaptations for driving, or combinations with, electric generators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K17/00—Using steam or condensate extracted or exhausted from steam engine plant
    • F01K17/04—Using steam or condensate extracted or exhausted from steam engine plant for specific purposes other than heating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
    • F23L7/00—Supplying non-combustible liquids or gases, other than air, to the fire, e.g. oxygen, steam
    • F23L7/007—Supplying oxygen or oxygen-enriched air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
    • F27B7/20—Details, accessories, or equipment peculiar to rotary-drum furnaces

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)

Abstract

The invention provides an energy-saving rotary kiln oxygen-enriched combustion system, which comprises: an original plant heat source for generating high pressure steam; the steam turbine drives the centrifugal machine by utilizing the high-pressure steam so as to enable the centrifugal machine to generate hot air, the generated hot air is used for providing sample gas for the high-pressure oxygen generation module after being dried and filtered, and heat in the hot air passing through the centrifugal machine and the waste heat drying machine is used for generating the high-pressure steam for regeneration and generating electricity by the power generation assembly after being recovered by waste heat; the high-pressure oxygen generation module is used for carrying out oxygen enrichment separation on the sample gas to respectively obtain oxygen-enriched gas and nitrogen-enriched gas; the nitrogen-rich gas is used for providing a driving gas source for gas-using equipment; the oxygen-enriched gas is used for providing combustion oxygen for the rotary kiln. The invention can recycle the original factory heat source for power generation, and the membrane tube can generate high-pressure nitrogen-rich gas for replacing the compressed air of the original workshop and oxygen-rich gas for providing gas required by combustion for the rotary kiln.

Description

Energy-saving rotary kiln oxygen-enriched combustion system
Technical Field
The invention relates to the technical field of air separation, in particular to an energy-saving rotary kiln oxygen-enriched combustion system.
Background
The oxygen-enriched combustion has the advantages of improving flame temperature, reducing the ignition point of fuel, accelerating combustion speed, increasing heat utilization rate, reducing air excess coefficient, reducing the smoke discharge after combustion and improving cement quality. As is well known, the key to success or failure of oxygen-enriched combustion in a rotary kiln of a cement plant lies in how to supply oxygen at low cost, and the operation cost, the maintenance cost and the device manufacturing cost of an oxygen-enriched device are effectively reduced. With research and development of membrane separation materials and breakthrough of process technology, the alpha (alpha) value of oxygen-nitrogen separation of organic membrane separation materials applied to air separation is mostly between 2 and 7, oxygen with the purity of about 30 to 60 percent can be directly obtained from air under a certain pressure ratio, the limit of cost control required by improving the separation coefficient of the membrane separation materials, further reducing the separation pressure ratio, improving the permeation quantity and the like is met, the challenge is difficult to continue, and especially in the occasions with compressed air resources in most cement process production processes, how to organically combine compressed air supply and oxygen-rich separation is realized, compressed air facilities matched with ash removal and blockage removal in raw cement processes are fully utilized, so that nitrogen-rich generated when oxygen is obtained by utilizing compressed air at low cost does not influence the original gas requirements of ash removal and blockage removal, and the like, and the oxygen-rich obtained at low cost can provide additional oxidant for cement rotary kilns to implement the additional economic benefits and the improvement, and a high-efficiency solution is urgently needed.
In view of this, the application number CN202110222362.5 proposes an oxygen supply method and apparatus for oxygen-enriched combustion in a rotary cement kiln (hereinafter referred to as "scheme and apparatus"), which employs a membrane separation oxygen generation technology to organically couple to an original compressed air supply facility, so as to separate the original compressed air into two gases: rich in nitrogen and oxygen; the generated nitrogen-rich directly replaces the compressed air requirement of the original factory and recovers the compression energy; the generated oxygen enrichment can be sent to a kiln to directly completely or partially replace the original clean air and coal air for oxygen enrichment combustion, the compression energy of a fan is recovered, and additional economic benefit is obtained due to the oxygen enrichment combustion; and the extreme condition of the use of the compressed air is fully considered, a standby compressed air compensation loop is adopted for flow compensation, so that an oxygen supply scheme of exchanging oxygen by the compressed air is realized on the whole, and the energy consumption of oxygen extraction is greatly reduced.
The scheme and the device compress air by using the original air compressor and then provide the air for the membrane separator, and because the original air compressor not only needs to consume energy in operation, but also can not directly utilize a heat source generated by original factory equipment; nor is it possible to feedback adjust the intake air concentration to the membrane separator based on the concentration of oxygen-enriched air output to the combustor.
Further retrieval shows that the application number CN201620642311.2 discloses a vertical gas heat medium furnace energy-saving device (hereinafter referred to as an energy-saving device), the main equipment comprises a W-shaped vacuum pump, a blower, an oxygen-enriched membrane component, an air preheating coil, an electric butterfly valve, a waste heat recovery coil, a fin heat exchange tube, a waste heat recovery induced draft fan and a centrifugal fan; the device adopts second grade flue gas waste heat recovery and utilizes the technique, air oxygenation technique, utilize preheating flue gas waste heat on the one hand and preheat air and fuel, the material, on the other hand adds the oxygen boosting air and through improving combustion air temperature and oxygen content, not only make the flame highly shorten, and improve combustion strength, accelerate burning speed, obtain better heat-conduction, and simultaneously, flame temperature has improved, will be favorable to the combustion reaction completely, flue gas exhaust volume has been reduced, energy saving has, the thermal efficiency is improved, the effect of pollutant emission is reduced.
Because the 'energy-saving device' discloses that the flue gas waste heat recycling equipment can recycle flue gas heat and a large amount of latent heat of water vapor and reduce the sulfur content of discharged flue gas, the 'energy-saving device' flue gas waste heat recycling equipment is connected with the burner and is used for recycling flue gas combusted by the gas furnace, and even if the latent heat recycling equipment is disclosed, the reference cannot be directly or indirectly provided for the 'oxygen-enriched combustion oxygen supply method and device for the rotary cement kiln' to utilize a heat source generated by original plant equipment because the latent heat is not reprocessed.
Disclosure of Invention
The invention aims to provide an energy-saving rotary kiln oxygen-enriched combustion system to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
an energy-saving rotary kiln oxygen-enriched combustion system comprises:
the original factory heat source is used for generating high-pressure steam;
the high-pressure steam is used for driving a steam turbine, so that a centrifugal machine is driven to generate hot air, the generated hot air is used for providing sample gas for the high-pressure oxygen generation module after being filtered, residual heat is absorbed and filtered again, and heat in the hot air after being filtered and residual heat is absorbed is used for generating high-pressure steam for regeneration and generating power by a power generation assembly after being recovered;
the high-pressure oxygen generation module is used for carrying out oxygen enrichment separation on the sample gas to respectively obtain oxygen-enriched gas and nitrogen-enriched gas;
the nitrogen-rich gas is used for providing a driving gas source for gas-using equipment;
the oxygen-enriched gas is used for providing combustion oxygen for the rotary kiln.
Preferably, the original factory heat source generates high-pressure steam through a waste heat boiler.
Preferably, the waste heat recovery comprises: the heat in the hot air generated by the front two stages of the centrifugal machine is recycled to the waste heat boiler for power generation of the power generation assembly, and meanwhile, the excess heat energy generated by the waste heat absorption machine is recycled and conveyed to the waste heat boiler for generating high-pressure steam to drive the steam turbine;
the hot air generated by the third stage of the centrifugal machine can be conveyed to the waste heat absorption machine to provide sample gas for the high-pressure oxygen generation module.
Preferably, the hot air generated by the first two stages of the centrifugal machine and the hot air generated by the third stage of the waste heat absorption dryer are both sent to a waste heat boiler through a heat exchanger.
Preferably, hot air generated by the third stage of the centrifugal machine enters the waste heat absorption machine after being filtered by the filter group I, and the hot air passing through the waste heat absorption machine is filtered again by the filter group II to be used as sample gas.
Preferably, the power generation assembly is based on a steam turbine generator, and the steam turbine generator is respectively connected with the waste heat boiler and the electric equipment.
Preferably, the high-pressure oxygen generation module obtains oxygen-enriched gas for the absorption of the Roots blower, one part of the oxygen-enriched gas is sent into the kiln tail of the rotary kiln through the kiln tail coal feeding blower, and the rest part of the oxygen-enriched gas is sent into the oxygen-enriched combustor through the kiln head coal feeding blower and the inner and outer blowers of the kiln head and finally enters the kiln head of the rotary kiln.
Preferably, the air inlet end of the high-pressure oxygen generation module is connected with a servo valve used for adjusting the purity of the sample gas, the servo valve adjusts the purity of the oxygen-enriched gas output by the Roots blower through a pressure adjusting valve, and a regulating type emptying valve II used for emptying redundant oxygen-enriched gas is connected on a pipeline between the high-pressure oxygen generation module and the Roots blower.
Preferably, the Roots blower is connected with an oxygen-enriched pipeline.
Preferably, the flowmeter II and the oxygen detector are installed on the oxygen enrichment pipeline, wherein the oxygen detector is used for detecting feedback, and then controls the servo valve to adjust the purity of the sample gas according to the detection feedback.
Preferably, the oxygen-enriched pipeline is used for conveying oxygen-enriched gas and is respectively connected with a kiln head coal-feeding fan, a kiln head inner fan, a kiln head outer fan and a kiln tail coal-feeding fan, the oxygen-enriched combustor is provided with 3 channels, 1 channel butt joint kiln head coal-feeding fan conveys combustion coal powder for the rotary kiln, 2 channel butt joint kiln head inner fan and outer fan convey pure gas for the rotary kiln, gas and coal powder in each channel are mixed through the oxygen-enriched combustor to be sprayed into the rotary kiln and are combusted, the oxygen-enriched combustor is installed at the kiln head of the rotary kiln, and the kiln tail coal-feeding fan is used for feeding mixed oxygen-enriched gas and coal air for the kiln tail of the rotary kiln.
Preferably, a flow meter and a regulating type emptying valve I are arranged on a pipeline between the nitrogen-rich gas and gas utilization equipment.
Compared with the prior art, the invention has the beneficial effects that:
the steam turbine drives the centrifugal machine by using high-pressure steam generated by an original heat source of a cement plant as power, so that the motor of the original centrifugal machine can be replaced, and the energy conversion rate of the steam turbine directly driving the centrifugal machine is much higher than that of driving the generator to generate electric power and then driving the motor, thereby achieving the purposes of saving energy and reducing consumption.
The heat in the hot wind generated by the 1 st 2 nd level of the centrifugal machine is recovered by the waste heat recovery device and then input into the waste heat boiler, the hot wind generated by the 3 rd level of the centrifugal machine can be filtered by the filter group I and then enters the waste heat absorption machine, the waste heat energy generated by the waste heat absorption machine can be conveyed to the waste heat boiler, and the waste heat boiler drives the steam turbine again, so that the capacity can achieve the purpose of circulation, and the energy conservation and the consumption reduction are realized.
The main heat sources of the waste heat boiler are generated from a rotary kiln, a grate cooler, a decomposing furnace and the like of a cement plant, and the problem that the existing process cannot achieve a good energy-saving effect because the original waste heat boiler is mainly used for power generation and the power generation conversion rate is low is solved.
The high-pressure oxygen generating membrane group generates nitrogen-rich gas and oxygen-rich gas, the nitrogen-rich gas is high-pressure gas, and the gas can be used for compressed air of an original workshop, so that the useful value generated by the system energy consumption can be better utilized, and the energy saving and consumption reduction are further realized.
The oxygen-enriched gas is sprayed into the rotary kiln through the oxygen-enriched burner in one way, so that the oxygen content in the rotary kiln can be improved, the coal powder can be more fully combusted in the kiln head of the rotary kiln, the heat production quantity is higher, and the purposes of saving energy and reducing consumption are achieved; one path of coal is mixed with kiln tail coal feeding air generated by a kiln tail coal feeding fan, so that the oxygen content in the coal powder can be improved, the coal powder can be more fully combusted in the kiln tail of the rotary kiln, the heat production quantity can be higher, and the purposes of energy conservation and consumption reduction are achieved.
Drawings
FIG. 1 is a three-dimensional schematic view of the overall structure of the present invention;
in the figure: 1 steam turbine, 2 centrifuges, 3 filter group I, 4 residual heat absorption machines, 5 filter group II, 6 servo valves, 7 high-pressure oxygen generation modules, 8 high-pressure nitrogen-rich gas, 9 flow meter I, 10 adjusting type emptying valves I, 11 gas equipment, 12 adjusting type emptying valves II, 13 pressure adjusting valves, 14 Roots blowers, 15 flow meters II, 16 oxygen detectors, 17 oxygen-rich pipelines, 18 kiln head coal-feeding blowers, 19 oxygen-rich combustors, 20 rotary kilns, kiln head inner and outer blowers 21, 22 kiln tail coal-feeding blowers, 24 heat exchangers, 25 residual heat boilers, 26 steam turbine generators, 27 power equipment, 28 original factory heat sources and 29 high-pressure steam.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example (b):
referring to fig. 1, the present invention provides a technical solution:
an energy-saving rotary kiln oxygen-enriched combustion system comprises a steam turbine 1, a high-pressure oxygen generation membrane group 7 and a rotary kiln 20. The original plant heat source 28 is fed to the waste heat boiler 25, and then high pressure steam 29 is generated to drive the steam turbine 1. The steam turbine 1 is connected with the centrifugal machine 2, and gas between the centrifugal machine 2 and the waste heat sucking and drying machine 4 is filtered through the filter group I3. And recovering waste heat of the centrifuge 2 and the waste heat absorption dryer 4, and then sending the waste heat into a heat exchanger 24, wherein the heat exchanger 24 is connected to a waste heat boiler 25, and the waste heat boiler 25 is sequentially connected with a steam turbine generator 26 and electric equipment 27.
The waste heat is inhaled and is dried gas between machine 4 and the high pressure oxygen generation membrane group 7 and is filtered through filter group II 5, and roots's fan 14 is connected to high pressure oxygen generation membrane group 7, and roots's fan 14 is connected oxygen boosting pipeline 17. The oxygen-enriched combustor 19 is connected to the head of the rotary kiln 20, and the kiln tail coal feeding fan 22 is connected with the kiln tail of the rotary kiln 20.
The air inlet end of the high-pressure oxygen generation membrane group 7 is connected with a servo valve 6 which is an air suction type regulating valve, and the servo valve 6 is connected with the air outlet end of a Roots blower 14 through a pressure regulating valve 13. The gas outlet end of the Roots blower 14 is sequentially provided with a flow meter II 15 and an oxygen detector 16 (namely, an oxygen enrichment pipeline 17 close to the Roots blower 14 is provided with the flow meter II 15 and the oxygen detector 16), and the servo valve 6 and the oxygen detector 16 are controlled by a control system such as a PLC.
The nitrogen-rich gas 8 generated by the high-pressure oxygen generation membrane group 7 is used for supplying gas to a gas using device 11, and a flow meter I9 and a regulating type emptying valve I10 are arranged on a pipeline between the nitrogen-rich gas 8 and the gas using device 11.
1. The steam turbine 1 utilizes high-pressure steam generated by an original heat source of a cement plant as power to drive the centrifugal machine 2, so that the motor of the original centrifugal machine 2 can be replaced, the energy conversion rate of the centrifugal machine 2 directly driven by the steam turbine 1 is much higher than that of the centrifugal machine 2 which is driven by a generator to generate electric power to drive the motor, and the purposes of energy conservation and consumption reduction are achieved;
2. the hot-blast heat of 21 st 2 nd grades of production of centrifuge is input exhaust-heat boiler 25 after being retrieved by waste heat recovery device, and the hot-blast 3 rd grade of production of centrifuge can carry out waste heat absorption machine 4 after I3 filters through the filter bank, and the waste heat energy of the many waste heat that waste heat absorption machine 4 produced can be carried to exhaust-heat boiler 25, and exhaust-heat boiler 25 redrives steam turbine 1, and the ability can reach a endless purpose like this to energy saving and consumption reduction. The waste heat absorption machine 4 changes the flow of cooling water through a manual valve to change the temperature of a gas outlet, the opening of the manual valve is large, the cooling water amount is large, the temperature of the gas outlet is low, and the temperature of the gas at the inlet of a membrane tube (namely a high-pressure oxygen generation membrane group 7) is controlled, so that the working efficiency of the membrane tube can be improved, the oxygen-enriched purity is improved, and the service life of the membrane tube is prolonged;
3. the main heat source of the waste heat boiler 25 is generated by a rotary kiln, a grate cooler, a decomposing furnace and the like of a cement plant, the original waste heat boiler is mainly used for power generation, and the existing process cannot achieve a good energy-saving effect due to low power generation conversion rate;
4. high-pressure gas generated by the centrifuge 2 enters a high-pressure oxygen generation membrane group 7 for oxygen enrichment separation after being subjected to dewatering and filtering through a filter group I3, a waste heat suction dryer 4 and a filter group II 5, the high-pressure oxygen generation membrane group 7 is divided into an oxygen enrichment outlet and a nitrogen enrichment outlet, the gas generated by the nitrogen enrichment outlet is high-pressure nitrogen enrichment gas 8 which is high-pressure gas, and the gas can replace compressed air of an original workshop for use (an air compressor which is originally supplied with compressed air of the original workshop can be shut down correspondingly), so that the system can better utilize the useful value generated by the energy consumption of the system, and further save energy and reduce consumption;
5. the oxygen-enriched outlet is oxygen-enriched gas at normal pressure, the oxygen-enriched gas at normal pressure is directly absorbed by the Roots blower 14, the pressure building of the oxygen-enriched outlet can be effectively avoided, the high-pressure oxygen generation membrane group 7 can be further prevented from being damaged, if the system generates redundant oxygen-enriched gas, the redundant oxygen-enriched gas can be emptied through the adjusting type emptying valve II 12, and the emptying rate can be adjusted;
6. the Roots blower 15 is used for absorbing the oxygen-enriched gas and then sending into the oxygen-enriched pipeline 17, install flow counter II 15 and oxygen detector 16 on the pipeline, if the oxygen-enriched gas end needs to use the oxygen-enriched gas of different purities, can detect and control the servovalve 6 and carry on the purity regulation through the oxygen analyzer 16, the gas that the servovalve 6 absorbs is the gas that the centrifugal machine 2 produces and filters through the dehydration, use this gas (it is the high-pressure gas, so has added the pressure control valve 13 and used for regulating this gas pressure, in order to mix and fill with the oxygen-enriched gas better), thus achieve the purity regulation purpose of oxygen;
7. the output of the oxygen-enriched gas in the oxygen-enriched pipeline 17 is divided into two parts which are specifically divided into three paths, one path is sent into the oxygen-enriched combustor 19 through the kiln head internal and external fan 21 (also called a kiln head air purification fan), the oxygen content in the oxygen-enriched combustor 19 (entering the rotary kiln 20) can be improved, and therefore the pulverized coal is more fully combusted in the rotary kiln 20, the heat production quantity is higher, and the purposes of energy conservation and consumption reduction are achieved. One path is sent into the kiln head coal feeding fan 18 to be mixed with kiln head coal feeding air of the kiln head coal feeding fan 18, so that the oxygen content in the coal powder can be improved, the coal powder can be more fully combusted in the kiln head of the rotary kiln 20, the heat production quantity is higher, and the purposes of energy conservation and consumption reduction are achieved. And one path of the air is mixed with kiln tail coal feeding air generated by the kiln tail coal feeding fan 22, so that the oxygen content in the coal powder can be improved, the coal powder can be more fully combusted in the kiln tail of the rotary kiln 20, the heat production quantity is higher, and the purposes of saving energy and reducing consumption are achieved.
Air generated by the kiln head internal and external fans 21 (or called kiln head air purification fans) is mixed with oxygen-enriched gas, and the air is mixed to the target control oxygen concentration to supply air for the oxygen-enriched combustor 19, so that the oxygen-enriched combustion efficiency is provided, and meanwhile, the load of the oxygen-enriched pipeline 17 for supplying air can be reduced.
The remaining parts of the invention, which are not described, may be the same as, or well known or may be implemented using the prior art, and will not be described in detail herein.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (10)

1. An energy-saving rotary kiln oxygen-enriched combustion system is characterized by comprising:
-a primary plant heat source (28) for generating high pressure steam (29);
the high-pressure steam (29) is utilized to drive the steam turbine (1) so as to drive the centrifugal machine (2) to enable the centrifugal machine (2) to generate hot air, the generated hot air is used for providing sample gas for the high-pressure oxygen generation module (7) after being filtered, residual heat is absorbed and filtered again, and heat in the hot air after being filtered and residual heat is absorbed is used for generating high-pressure steam (29) to regenerate and generating electricity by the power generation assembly after being recovered;
the high-pressure oxygen generation module (7) is used for carrying out oxygen-enriched separation on the sample gas to respectively obtain oxygen-enriched gas and nitrogen-enriched gas (8);
the nitrogen-rich gas (8) is used for providing a driving gas source for a gas-using device (11);
the oxygen-enriched gas is used to provide combustion oxygen for the rotary kiln (20).
2. An energy-saving rotary kiln oxycombustion system according to claim 1, characterized in that the original plant heat source (28) generates high-pressure steam (29) through a waste heat boiler (25), and the waste heat recovery comprises: the heat in the hot air generated by the front two stages of the centrifuge (2) is recovered to a waste heat boiler (25) for power generation of a power generation assembly, and meanwhile, the excess heat energy generated by the waste heat absorption dryer (4) is recovered and conveyed to the waste heat boiler (25) for generating high-pressure steam (29) to drive the steam turbine (1);
the hot air generated by the third stage of the centrifugal machine (2) can be conveyed to the residual heat sucking machine (4) to provide sample gas for the high-pressure oxygen generation module (7).
3. An energy-saving rotary kiln oxygen-enriched combustion system as claimed in claim 2, wherein the hot air generated by the first two stages of the centrifuge (2) and the hot air generated by the third stage of the residual heat absorption dryer (4) are both sent to the residual heat boiler (25) through the heat exchanger (24).
4. The energy-saving rotary kiln oxygen-enriched combustion system as claimed in claim 2, wherein hot air generated by the third stage of the centrifuge (2) is filtered by the filter group I (3) and then enters the residual heat absorption dryer (4), and the hot air passing through the residual heat absorption dryer (4) is filtered again by the filter group II (5) and then is used as sample gas.
5. An energy-saving rotary kiln oxycombustion system according to claim 1, characterized in that the power generation assembly is based on a turbine generator (26), and the turbine generator (26) is connected with the waste heat boiler (25) and the power utilization equipment (27).
6. The energy-saving rotary kiln oxygen-enriched combustion system as claimed in claim 1, wherein the high-pressure oxygen generation module (7) supplies the obtained oxygen-enriched gas to the Roots blower (14) for absorption, a part of the oxygen-enriched gas is sent to the kiln tail of the rotary kiln (20) through the kiln tail coal-feeding blower (22), and the rest part of the oxygen-enriched gas is sent to the oxygen-enriched burner (19) through the kiln head coal-feeding blower (18) and the kiln head internal and external blowers (21) and finally enters the kiln head of the rotary kiln (20).
7. The energy-saving rotary kiln oxygen-enriched combustion system as claimed in claim 6, wherein a servo valve (6) for adjusting the purity of the sample gas is connected to the gas inlet end of the high-pressure oxygen generation module (7), the servo valve (6) adjusts the purity of the oxygen-enriched gas output by the Roots blower (14) through a pressure adjusting valve (13), and a regulating type blow-down valve II (12) for exhausting the redundant oxygen-enriched gas is connected to a pipeline between the high-pressure oxygen generation module (7) and the Roots blower (14).
8. The energy-saving rotary kiln oxygen-enriched combustion system as claimed in claim 6 or 7, wherein the Roots blower (14) is connected with an oxygen-enriched pipeline (17), the oxygen-enriched pipeline (17) is used for conveying oxygen-enriched gas and is respectively connected with a kiln head coal-feeding blower (18), a kiln head internal-external blower (21) and a kiln tail coal-feeding blower (22), the oxygen-enriched burner (19) is provided with 3 channels, 1 channel is connected with the kiln head coal-feeding blower (18) for conveying combustion coal powder for the rotary kiln (20), 2 channels are connected with the kiln head internal-external blower (21) for conveying pure gas for the rotary kiln (20), the oxygen-enriched gas and the coal powder in each channel are mixed and sprayed into the rotary kiln (20) through the oxygen-enriched burner (19) and are combusted, the burner (19) is installed at the kiln head of the rotary kiln (20), and the kiln tail coal-feeding blower (22) is used for conveying the mixed oxygen-enriched gas and coal air for the kiln tail of the rotary kiln (20).
9. The energy-saving rotary kiln oxygen-enriched combustion system as claimed in claim 8, wherein a flow meter II (15) and an oxygen detector (16) are installed on the oxygen-enriched pipeline (17), wherein the oxygen detector (16) is used for detecting feedback, and further controlling the servo valve (6) to adjust the purity of the sample gas according to the detection feedback.
10. An energy-saving oxygen-enriched combustion system of a rotary kiln as claimed in claim 1, wherein a flow meter (9) and a regulating type emptying valve I (10) are arranged on a pipeline between the nitrogen-enriched gas (8) and a gas using device (11).
CN202211374140.6A 2022-11-03 2022-11-03 Energy-saving rotary kiln oxygen-enriched combustion system Pending CN115585028A (en)

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CN202211374140.6A CN115585028A (en) 2022-11-03 2022-11-03 Energy-saving rotary kiln oxygen-enriched combustion system

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