CN110173685B - Chemical looping combustion device utilizing ash - Google Patents
Chemical looping combustion device utilizing ash Download PDFInfo
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- CN110173685B CN110173685B CN201910384243.2A CN201910384243A CN110173685B CN 110173685 B CN110173685 B CN 110173685B CN 201910384243 A CN201910384243 A CN 201910384243A CN 110173685 B CN110173685 B CN 110173685B
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- 238000002485 combustion reaction Methods 0.000 title claims abstract description 63
- 239000000126 substance Substances 0.000 title claims description 27
- 239000003245 coal Substances 0.000 claims abstract description 96
- 239000002956 ash Substances 0.000 claims abstract description 80
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 51
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 51
- 239000001301 oxygen Substances 0.000 claims abstract description 51
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- 239000002893 slag Substances 0.000 claims abstract description 17
- 238000000926 separation method Methods 0.000 claims abstract description 16
- 238000000034 method Methods 0.000 claims abstract description 11
- 239000010881 fly ash Substances 0.000 claims abstract description 8
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- 238000009833 condensation Methods 0.000 claims abstract description 6
- 230000005494 condensation Effects 0.000 claims abstract description 6
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 14
- 238000006243 chemical reaction Methods 0.000 claims description 12
- 238000005303 weighing Methods 0.000 claims description 10
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- 239000000843 powder Substances 0.000 claims description 7
- 239000002245 particle Substances 0.000 claims description 6
- 238000012546 transfer Methods 0.000 claims description 5
- 229910000831 Steel Inorganic materials 0.000 claims description 4
- 239000010959 steel Substances 0.000 claims description 4
- 239000003463 adsorbent Substances 0.000 claims description 3
- 238000005345 coagulation Methods 0.000 claims description 3
- 230000015271 coagulation Effects 0.000 claims description 3
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 3
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- 229910002092 carbon dioxide Inorganic materials 0.000 description 21
- 239000010883 coal ash Substances 0.000 description 6
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- 229910002091 carbon monoxide Inorganic materials 0.000 description 5
- 230000005291 magnetic effect Effects 0.000 description 5
- 239000003054 catalyst Substances 0.000 description 4
- 238000000227 grinding Methods 0.000 description 4
- 239000000779 smoke Substances 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 239000000446 fuel Substances 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 3
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- 238000005299 abrasion Methods 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
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- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
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- 229910052708 sodium Inorganic materials 0.000 description 1
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- 238000001179 sorption measurement Methods 0.000 description 1
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- 229910001845 yogo sapphire Inorganic materials 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C10/00—Fluidised bed combustion apparatus
- F23C10/002—Fluidised bed combustion apparatus for pulverulent solid fuel
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C10/00—Fluidised bed combustion apparatus
- F23C10/18—Details; Accessories
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C10/00—Fluidised bed combustion apparatus
- F23C10/18—Details; Accessories
- F23C10/22—Fuel feeders specially adapted for fluidised bed combustion apparatus
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C2206/00—Fluidised bed combustion
- F23C2206/10—Circulating fluidised bed
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
Abstract
The invention relates to a chemical-looping combustion device utilizing ash, which consists of a circulating fluidized bed system, a cinder treatment system, an ash treatment system and a fly ash circulation system, wherein one outlet of a fluidized bed is connected with one inlet of a coal mill through a cyclone separator, a heat exchanger and a dust remover in sequence; the other outlet of the fluidized bed is connected with the other inlet of the fluidized bed through a drum-type slag cooler, an ash separation device, a condensation device, a ball mill and a gas burner in sequence. The invention can realize the high-efficiency utilization of chemical-looping combustion, because the ash is adopted to replace the traditional metal oxygen carrier, the oxygen content in the ash is very high, the mechanism of the chemical-looping combustion is not changed by using the ash, the green and clean characteristic of the chemical-looping combustion is still kept, meanwhile, the used ash is obtained from local materials, the process is simple and high-efficiency, and the raw material cost of the device for the chemical-looping combustion is greatly reduced.
Description
Technical Field
The invention relates to a chemical looping combustion device, in particular to a method and a device for chemical looping combustion by using ash as an oxygen carrier.
Background
Chemical looping combustion, a new combustion mode of coal, attracts attention particularly on the emission of greenhouse gases because only carbon dioxide and steam are produced as combustion products to facilitate the separation of carbon dioxide. The basic principle is that the traditional combustion of direct contact reaction of fuel and air is decomposed into 2 gas-solid reactions by the action of an oxygen carrier, the fuel and the air do not need to be in contact, and the oxygen in the air is transferred into the fuel by the oxygen carrier, so that great convenience is provided for separation of carbon dioxide. Nowadays, oxygen carriers are generally used as metals, such as Ni, Co, Fe, Cu, Mn, etc., and Fe is generally used as a metal oxygen carrier. However, the use of the metal oxygen carrier firstly requires a separate air reaction furnace for the metal oxygen carrier, which is not very convenient for the circulation and preparation of the metal oxygen carrier, and the oxygen content of the metal itself as the oxygen carrier is not very large, so a large amount of metal oxygen carrier is needed in the combustion reaction chamber to maintain the stable reaction, which has certain difficulty for the circulation of metal resources, and may also cause the incomplete combustion of coal to generate unnecessary smoke, so the chemical looping combustion with great advantages is not widely used nowadays. Therefore, the search for an oxygen carrier which has convenient acquisition mode, high oxygen content, low cost or low consumption and can maintain the stable circulation of chemical-looping combustion has very important research significance and economic value.
Disclosure of Invention
The invention aims to solve the problems of large metal demand, resource waste and complicated device and equipment of a common chemical looping combustion device, and provides a chemical looping combustion device utilizing ash for chemical looping combustion by utilizing the combustion product ash of coal as an oxygen carrier. The device is through the cyclic utilization of the combustion product ash content of coal itself, utilizes a large amount of oxygen that contains in the ash content to come for the burning oxygen suppliment of coal simultaneously to this circulation is reciprocal, and the characteristics of the high oxygen content of maximize utilization ash content carry out the chemical chain burning, have not only solved the not high problem of metal oxygen carrier effective utilization, have further simplified burner simultaneously.
The technical scheme of the invention is as follows:
a chemical looping combustion device utilizing ash content comprises a circulating fluidized bed system, a cinder treatment system, an ash content treatment system and a fly ash circulation system, wherein the circulating fluidized bed system comprises a fluidized bed, a cyclone separator, a blower, a gas burner, a cyclone burner and a coke pretreatment device; the coal cinder treatment system comprises a drum-type slag cooler and an ash separation device; the ash treatment system comprises a coagulation device and a crushing device; the fly ash circulating system comprises a heat exchanger, a dust remover, a coal mill and a coal feeding system; one outlet of the fluidized bed is connected with one inlet of a coal mill through a cyclone separator, a heat exchanger and a dust remover in sequence, the other inlet of the coal mill is connected with a coal feeding system, and the outlet of the coal mill is connected with one inlet of the fluidized bed through a coke pretreatment device and a cyclone burner in sequence; the other outlet of the fluidized bed is connected with the other inlet of the fluidized bed sequentially through the drum-type slag cooler, the ash separation device, the condensation device, the ball mill and the gas burner; the inlet of the drum-type slag cooler is positioned at the bottom of the fluidized bed; the other outlet of the cyclone separator is connected with the other inlet of the coke pretreatment device; the air feeder is connected with the fluidized bed.
Further, the fluidized bed comprises a fluidized bed reactor and a tubular resistance furnace, wherein the tubular resistance furnace is arranged in the fluidized bed reactor, and the fluidized bed reactor is heated by the tubular resistance furnace to maintain the reaction temperature.
Furthermore, the heat exchanger package adopts a shell-and-tube eddy current thermal film heat exchanger, and consists of a shell, a heat transfer tube bundle, a tube plate, a baffle plate and a tube box, wherein the heat transfer tube bundle is arranged in a square shape and is convenient to clean.
Furthermore, the dust remover is used for separating dust from flue gas, conveying dust-containing gas into the dust removing device through the pipeline gas path, collecting the dust by the dust removing device, and introducing the clean gas into a main pipe or directly discharging the clean gas into the whole set of equipment of the atmosphere.
Further, the coal mill is an MGS type double-inlet and double-outlet steel ball coal mill.
Further, the coal feeding system comprises a coal feeding amount adjusting device of a coal mill, a conveying and metering rubber belt and an electronic weighing device; the coal feeding port of the coal mill coal feeding amount adjusting device is connected with a coal gate, the coal outlet is connected with a conveying metering rubber belt, an electronic weighing device is arranged below the conveying metering rubber belt, the coal feeding amount adjusting device of the coal mill accurately adjusts the coal feeding amount of the coal mill according to the load requirement, the conveying metering rubber belt continuously and uniformly conveys coal, an electric signal proportional to the weight of the coal and a belt speed signal of the conveying metering rubber belt detected by a speed sensor are generated by a weighing sensor of the electronic weighing device, and the electric signal and the belt speed signal are simultaneously sent to an integrating device to obtain the instantaneous flow and the accumulated amount after integration.
A use method of a chemical-looping combustion device utilizing ash comprises the following specific steps: the method comprises the steps of firstly, feeding high-temperature ash-containing flue gas into a cyclone separator for separation, enabling the separated flue gas to flow out from an outlet at the upper end of the cyclone separator, enabling the separated flue gas to enter a dust remover for dust removal after heat exchange through a heat exchanger, then entering a coal mill and a coal feeding system to be fed into a fluidized bed for combustion, enabling residual coal slag and ash after combustion to enter a roller slag cooler to be prepared into an ash oxygen carrier through cobalt powder in an ash separation device, then entering a condensation device to be condensed into block ash through ATP, then crushing the block ash into fine powder in a crushing device, and enabling the fine powder to flow back to the fluidized bed to be.
Compared with the traditional chemical-looping combustion device, the chemical-looping combustion device has the following beneficial effects:
the invention can realize the high-efficiency utilization of chemical-looping combustion, because the ash is adopted to replace the traditional metal oxygen carrier, the oxygen content in the ash is very high, the mechanism of the chemical-looping combustion is not changed by using the ash, the green and clean characteristic of the chemical-looping combustion is still kept, meanwhile, the used ash is obtained from local materials, the process is simple and high-efficiency, and the raw material cost of the device for the chemical-looping combustion is greatly reduced.
On the basis of the traditional chemical looping combustion device, the metal oxygen carrier used in the original chemical looping combustion is changed into the ash content serving as the oxygen carrier so as to improve the oxygen content of the oxygen carrier and simplify the combustion equipment, so that the metal raw materials are saved, and the wide application of the chemical looping combustion is greatly promoted.
Drawings
FIG. 1 is a schematic view of the structure of a chemical looping combustion apparatus using ash according to the present invention.
Detailed Description
The invention is further described with reference to the following figures and examples.
As shown in FIG. 1, the chemical looping combustion device using ash of the present invention is mainly used for low emission and resource-saving circulating combustion of a fluidized bed boiler. The device consists of a circulating fluidized bed system, a cinder treatment system, an ash treatment system and a fly ash circulation system.
The circulating fluidized bed system comprises a fluidized bed 1, a cyclone separator 2, a blower 3, a gas burner 4, a cyclone burner 5 and a coke pretreatment device 6. The coal cinder treatment system comprises a drum-type slag cooler 7 and an ash separation device 8. The ash handling system includes a coagulation apparatus 9, a ball mill 10. The fly ash circulation system comprises a heat exchanger 11, a dust remover 12, a coal mill 13 and a coal feeding system 14.
The outlet of the fluidized bed 1 is connected to the inlet of said cyclone 2. One outlet of the cyclone separator 2 is connected with the other inlet of the coal mill 13 through the heat exchanger 11 and the dust remover 12, and the cyclone separator 2 and the other outlet are connected with one inlet of the coke pretreatment device 6. The inlet of the roller type slag cooler 7 is positioned at the bottom of the fluidized bed 1. The outlet of the drum-type slag cooler 7 is connected with the inlet of an ash separating device 8. The outlet of the ash separation device 8 is connected to the inlet of the mixing device 9. The inlet of the coal mill 13 is connected with the dust remover 12 and the coal feeding system 14 at the same time. The outlet of the mixing device 9 is connected to the inlet of the ball mill 10. The outlet of the crushing device 10 is connected with the fluidized bed 1. The outlet of the coal mill 13 is connected with a coke pretreatment device 6.
The fluidized bed 1 comprises: and the fluidized bed reactor is heated by a tubular resistance furnace to maintain the reaction temperature. The blower 3 includes: the fan comprises a shell, a fan motor, a fan impeller, an air gun fire tube, an air door controller, an air door baffle, a cam adjusting mechanism and a diffusion disc. Air is sucked from the atmosphere and sent into an air preheater, after the air is heated to the design temperature, a part of the air is used as secondary air of a boiler and is directly sent into a reduction reaction through a combustor.
The ash processing system further comprises: ATP preparation device, ATP adsorption device.
A closed cycle, utilize ash content to produce oxygen, reduce the external oxygen supply, raise the utilization coefficient of ash content, reduce the combustion coking of high-sodium coal, combustion apparatus stained, by circulating fluidized bed combustion system, recycle ash content system, oxygen carrier reaction system, carbon dioxide circulation system, ash and break the hot system and fly ash circulation system to make up fast;
the ash recovery system includes: a coal ash collecting device and a coal ash absorbing device. The coal ash collection device includes: the electric dust collector, the electric field ash bucket fly ash and the electric air locker are respectively unloaded to 3 catenary scraper ash conveyors on a 7.5 m-layer platform of the electric dust collector through the electric air locker, then 7.5m layers of scraper ash are collected by a main scraper ash conveyor on a 5.2 m-layer platform of the electric dust collector, enter an ash collecting bucket and are conveyed to an ash absorption device through a fluidized double-bin pump. The coal ash absorption device comprises: the magnetic attraction device may be a ferromagnetic material magnet such as a magnet, magnetite, or a device for generating a magnetic field in a narrow sense, or an object or device for generating a magnetic field in a broad sense, or may be an electromagnet, or more preferably, an electromagnet attraction device characterized in that an object for attracting an iron and generating a magnetic field outside thereof, and a magnet as a magnetic dipole, are capable of attracting a ferromagnetic material such as a metal such as iron, nickel, or cobalt.
The ATP preparation method comprises the steps of mixing a certain amount of ATP powder adsorbent with Na2SiO3 and α -Al2O3 according to different proportions, adding PVA solutions with different mass concentrations, preparing columnar particles with the particle size and the particle length of about 3mm through an extrusion forming granulation device, washing the columnar particles for several times by deionized water, and naturally drying the columnar particles in the air to obtain the ATP granular adsorbent.
The ATP-adsorbing device includes: the prepared ATP catalyst and the collected coal ash can obviously increase the specific surface area of an oxygen carrier and the abrasion resistance, have catalytic action on the coal conversion process, and obviously improve the initial carbon conversion rate through the synergistic action of the ATP catalyst and Fe2O 3;
the ash block crushing device comprises: the ball mill, the steel ball grinding body is packed into the barrel according to different diameters and a certain proportion, the supplies are packed into the barrel from the hollow shaft of feed end of the ball mill, when the ball mill barrel rotates, the grinding body attaches to the lining board of the barrel, when brought to certain height, because its own gravity action is thrown off, the falling grinding body breaks the supplies in the barrel;
the air oxidation reaction device comprises: the catalyst is characterized in that a large amount of mineral matters accumulated in the agglomerated ash are subjected to oxidation reaction with the oxygen fed by the blower under the catalytic action of the ATP and the catalyst to generate metal oxide, namely oxygen carriers.
The carbon dioxide collecting, circulating and conveying device comprises: a carbon dioxide collecting device and a carbon dioxide partition conveying device. The carbon dioxide collection device includes: carbon dioxide drainage is characterized in that carbon dioxide is dissolved in water, but the carbon dioxide is not high in solubility and low in dissolution rate, when carbon dioxide is introduced into water in a large amount, although a small amount of carbon dioxide is dissolved in water, more carbon dioxide escapes, and can be collected by drainage. Carbon dioxide subregion conveyor includes: the carbon dioxide is conveyed to the oxygen carrier reduction reaction area, and the carbon dioxide is not used, and the method is characterized in that carbon dioxide can be used for generating carbon monoxide at high temperature and conveying the carbon monoxide to the area where the oxygen carrier is located for reduction reaction to generate oxygen, and the circulation of a closed system is realized by using the coal combustion reaction product; (Q: complete combustion is not guaranteed from the start, so that there may be some carbon monoxide inclusion from the start, so that the temperature of the apparatus should be guaranteed at a temperature at which complete conversion to carbon monoxide takes place
The oxygen carrier reaction comprises: the carbon dioxide provided by the oxygen carrier carbon dioxide circulating device forms carbon monoxide at high temperature to react with the oxygen carrier, so as to provide oxygen for burning the pulverized coal. The fluidized bed combustion reaction comprises: the oxygen carrier reacts to supply oxygen, and the coal fed from coal mill in fluidized bed is fully reacted with oxygen to produce carbon dioxide and coal ash.
The heat exchanger 11 includes: the heat exchanger is a shell-and-tube eddy heat membrane heat exchanger, which is composed of shell, heat transfer tube bundle, tube plate, baffle plate (baffle plate and tube box, etc. because the heat exchanger contains fluid easy to scale, the heat exchange tube is arranged in square for cleaning, and because the device contains nano material, the temperature of the fluid reaches the index specified by the flow, so as to meet the requirement of process condition and improve the energy utilization rate.
The dust collector 12 includes: the equipment for separating dust from flue gas conveys dust-containing gas into a dust removal device through a pipeline gas path, the dust is collected in the dust removal device after gas-solid separation is carried out in the dust removal device, and clean gas is introduced into a main pipe or is directly discharged into the atmosphere;
the coal mill 13 includes: MGS type advances two steel ball coal mills that go out, structural feature is: the coal pulverizer comprises an elastic foundation, a rigid foundation, a separation type and a compact type, a dynamic separator, a static separator and a static separator (a split axial separator and a radial separator, coal is pulverized into coal powder mainly by three modes of crushing, smashing and grinding in the coal pulverizer, the coal is crushed and the surface area of the coal is increased continuously, a new surface area is increased, the binding force among solid molecules must be overcome, energy consumption is needed, a double-inlet and double-outlet structure is adopted, the air supply is convenient, the pulverized coal drying is guaranteed, meanwhile, a circulation needed interface is provided for a circulation system device, and the efficient operation of the system is guaranteed.
The coal feed system 14 includes: a mechanical equipment for accurately regulating coal feeding quantity of coal mill is characterized by that the coal is fed into the coal feeder by means of coal gate, and is continuously and uniformly conveyed into the coal mill by means of conveying and metering rubber belt in the interior of coal feeder, and under the conveying and metering rubber belt an electronic weighing device is mounted, and the weighing sensor can produce an electric signal proportional to the weight of coal and belt speed signal detected by speed sensor, and simultaneously can be fed into an integrating device, and after the above-mentioned signals are integrated, the instantaneous flow quantity and accumulated quantity can be obtained.
A chemical-looping combustion device utilizing ash comprises the following working processes:
the upper end smoke outlet of the fluidized bed 1 is connected with the upper end smoke inlet of the cyclone separator 2, the smoke outlet enters the coal mill 3 after passing through the heat exchanger 11 and the dust remover 12 and is mixed with coal provided by the coal supply system 14 to be conveyed back to the fluidized bed 1 for circulation, the lower roller slag cooler 7 collects burning coal slag and ash to enter the ash separation device 8, the coal slag and ash are mixed with a Co @ Fe2O3/TiO2 core-shell oxygen carrier structure to obtain an ash oxygen carrier, the ash oxygen carrier enters the condensation device 9, the ash is condensed into block ash by ATP, and then the block ash is pulverized to 50(+ -15 nm) powder in the ball mill 10 and then is introduced into the gas combustor 4 for circular combustion.
The working principle of the invention is as follows: the ash content containing a large amount of oxygen generated by coal combustion is used as an oxygen carrier to supply oxygen for the combustion of coal so as to achieve the purpose of chemical looping combustion.
The invention can effectively reduce the consumption of metal in chemical looping combustion, improve the overall combustion efficiency of the chemical looping combustion, and has good popularization value for the more environment-friendly technology of chemical looping combustion in a large range.
Claims (7)
1. The utility model provides an utilize chemical looping combustion apparatus of ash content, comprises circulating fluidized bed system, cinder processing system, ash content processing system, flying ash circulation system, its characterized in that: the circulating fluidized bed system comprises a fluidized bed, a cyclone separator, a blower, a gas burner, a cyclone burner and a coke pretreatment device; the coal cinder treatment system comprises a drum-type slag cooler and an ash separation device; the ash treatment system comprises a coagulation device and a crushing device; the fly ash circulating system comprises a heat exchanger, a dust remover, a coal mill and a coal feeding system; one outlet of the fluidized bed is connected with one inlet of a coal mill through a cyclone separator, a heat exchanger and a dust remover in sequence, the other inlet of the coal mill is connected with a coal feeding system, and the outlet of the coal mill is connected with one inlet of the fluidized bed through a coke pretreatment device and a cyclone burner in sequence; the other outlet of the fluidized bed is connected with the other inlet of the fluidized bed sequentially through the drum-type slag cooler, the ash separation device, the condensation device, the crushing device and the gas burner; the inlet of the drum-type slag cooler is positioned at the bottom of the fluidized bed; the other outlet of the cyclone separator is connected with the other inlet of the coke pretreatment device; the air feeder is connected with the fluidized bed.
2. The chemical looping combustion apparatus using ash according to claim 1, wherein: the fluidized bed comprises a fluidized bed reactor and a tubular resistance furnace, wherein the tubular resistance furnace is arranged in the fluidized bed reactor, and the fluidized bed reactor is heated by the tubular resistance furnace to maintain the reaction temperature.
3. The chemical looping combustion apparatus using ash according to claim 1, wherein: the heat exchanger adopts a shell-and-tube type eddy current hot film heat exchanger and consists of a shell, heat transfer tube bundles, tube plates, baffle plates and tube boxes, wherein the heat transfer tube bundles are arranged in a square shape and are convenient to clean.
4. The chemical looping combustion apparatus using ash according to claim 1, wherein: the dust remover is used for separating dust from flue gas, conveying dust-containing gas into the dust removing device through the pipeline gas path, collecting the dust by the dust removing device, and introducing the clean gas into a main pipe or directly discharging the clean gas into the whole set of equipment of the atmosphere.
5. The chemical looping combustion apparatus using ash according to claim 1, wherein: the coal mill is an MGS type double-inlet and double-outlet steel ball coal mill.
6. The chemical looping combustion apparatus using ash according to claim 1, wherein: the coal feeding system comprises a coal mill coal feeding amount adjusting device, a conveying metering rubber belt and an electronic weighing device; the coal feeding port of the coal mill coal feeding amount adjusting device is connected with a coal gate, the coal outlet is connected with a conveying metering rubber belt, an electronic weighing device is arranged below the conveying metering rubber belt, the coal feeding amount adjusting device of the coal mill accurately adjusts the coal feeding amount of the coal mill according to the load requirement, the conveying metering rubber belt continuously and uniformly conveys coal, an electric signal proportional to the weight of the coal and a belt speed signal of the conveying metering rubber belt detected by a speed sensor are generated by a weighing sensor of the electronic weighing device, and the electric signal and the belt speed signal are simultaneously sent to an integrating device to obtain the instantaneous flow and the accumulated amount after integration.
7. The use method of the chemical looping combustion device using ash content as claimed in any one of claims 1 to 6, is characterized by comprising the following specific steps: the method comprises the steps of firstly, feeding high-temperature ash-containing flue gas into a cyclone separator for separation, enabling the separated flue gas to flow out from an outlet at the upper end of the cyclone separator, enabling the separated flue gas to enter a dust remover for dust removal after heat exchange through a heat exchanger, then entering a coal mill and a coal feeding system to be fed into a fluidized bed for combustion, enabling residual coal slag and ash after combustion to enter a roller slag cooler to be prepared into an ash oxygen carrier through cobalt powder in an ash separation device, then entering a condensation device to be condensed into block ash through an ATP particle adsorbent, then crushing the block ash into fine powder in a crushing device, and then feeding the fine powder back to the fluidized bed to be combusted.
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| US6244200B1 (en) * | 2000-06-12 | 2001-06-12 | Institute Of Gas Technology | Low NOx pulverized solid fuel combustion process and apparatus |
| CN201569172U (en) * | 2009-10-21 | 2010-09-01 | 东南大学 | Coal-firing device capable of separating carbon dioxide |
| CN202598494U (en) * | 2012-05-18 | 2012-12-12 | 东南大学 | Circulating fluidized bed chemical-looping combustion and CO2 separation device for coal and combustible solid waste |
| CN103496672A (en) * | 2013-09-30 | 2014-01-08 | 南京理工大学 | Device and process for preparing O2-CO2 mixed gas based on chemical-looping technology |
| CN104061570A (en) * | 2014-07-03 | 2014-09-24 | 上海理工大学 | Combustion method and device for preventing combustion coking and contamination of high-sodium coal |
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2019
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6244200B1 (en) * | 2000-06-12 | 2001-06-12 | Institute Of Gas Technology | Low NOx pulverized solid fuel combustion process and apparatus |
| CN201569172U (en) * | 2009-10-21 | 2010-09-01 | 东南大学 | Coal-firing device capable of separating carbon dioxide |
| CN202598494U (en) * | 2012-05-18 | 2012-12-12 | 东南大学 | Circulating fluidized bed chemical-looping combustion and CO2 separation device for coal and combustible solid waste |
| CN103496672A (en) * | 2013-09-30 | 2014-01-08 | 南京理工大学 | Device and process for preparing O2-CO2 mixed gas based on chemical-looping technology |
| CN104061570A (en) * | 2014-07-03 | 2014-09-24 | 上海理工大学 | Combustion method and device for preventing combustion coking and contamination of high-sodium coal |
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