CN106398768B - Device and method for preparing synthesis gas by chemical looping combustion - Google Patents
Device and method for preparing synthesis gas by chemical looping combustion Download PDFInfo
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- CN106398768B CN106398768B CN201610960209.1A CN201610960209A CN106398768B CN 106398768 B CN106398768 B CN 106398768B CN 201610960209 A CN201610960209 A CN 201610960209A CN 106398768 B CN106398768 B CN 106398768B
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
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- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
- C10J3/46—Gasification of granular or pulverulent flues in suspension
- C10J3/48—Apparatus; Plants
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
- C10J3/46—Gasification of granular or pulverulent flues in suspension
- C10J3/48—Apparatus; Plants
- C10J3/50—Fuel charging devices
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
- C10J3/72—Other features
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J2300/00—Details of gasification processes
- C10J2300/09—Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
- C10J2300/0913—Carbonaceous raw material
- C10J2300/0916—Biomass
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J2300/00—Details of gasification processes
- C10J2300/09—Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
- C10J2300/0953—Gasifying agents
- C10J2300/0973—Water
- C10J2300/0976—Water as steam
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J2300/00—Details of gasification processes
- C10J2300/09—Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
- C10J2300/0983—Additives
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J2300/00—Details of gasification processes
- C10J2300/12—Heating the gasifier
- C10J2300/1223—Heating the gasifier by burners
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J2300/00—Details of gasification processes
- C10J2300/18—Details of the gasification process, e.g. loops, autothermal operation
- C10J2300/1807—Recycle loops, e.g. gas, solids, heating medium, water
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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
Abstract
The invention discloses a device for preparing synthesis gas by chemical looping combustion, which comprises a chemical looping combustion chamber, a biomass pyrolysis chamber and an oxygen carrier regeneration device, wherein the chemical looping combustion chamber is connected with the oxygen carrier regeneration device; the top of the chemical-looping combustion chamber is provided with a biomass oxygen carrier mixture inlet, the lower part in the chemical-looping combustion chamber is provided with an obliquely placed screen, the screen divides the lower part of the chemical-looping combustion chamber into an ash collection area and an oxygen carrier storage area, the ash collection area is provided with a first ash outlet, and the oxygen carrier storage area is connected with an oxygen carrier first return pipe; the upper part of the biomass pyrolysis chamber is provided with a biomass feed inlet, and the lower part of the biomass pyrolysis chamber is provided with a second gas outlet and a second ash outlet; the oxygen carrier regeneration device comprises a cyclone separator and an oxygen carrier regeneration pipe, wherein the outside of the oxygen carrier regeneration pipe is coated with a heating device. The device omits extra CO2In the preparation process of the water vapor, the characteristics of gas products generated by the chemical chain combustion of the biomass and large heat generation are utilized, and the full utilization of energy of the whole reaction is realized.
Description
Technical Field
The invention belongs to the technical field of synthesis gas preparation, and particularly relates to a device and a method for preparing synthesis gas by chemical looping combustion.
Background
The biomass energy is used as a clean and renewable energy source and can be used as a sole substituteFossil energy is converted into gaseous, liquid and solid fuels and other carbon resources for chemical feedstocks or products. The biomass is H2O and CO2Reaction products under the action of solar energy, which have the advantage of being clean, renewable and CO over the entire cycle2Is zero-emission. The annual output of crops and straws in China is about 7 hundred million tons, and about 3 hundred million tons of the straws can be used as fuel except for part of straws used as paper making raw materials and livestock feed, which is reflected in standard coal of about 1.5 hundred million tons. Other agricultural wastes are about 1.3 million tons. The preparation of synthesis gas by using biomass by a certain means has theoretical feasibility.
The synthesis gas is an important raw material for replacing the traditional petroleum synthesis chemical products, and has a very important position in the chemical industry. With the increasing exhaustion of fossil energy and the growing environmental problem, the preparation of synthesis gas by using biomass thermochemical conversion technology has important practical significance. The synthesis gas is H2And CO is a raw material gas for chemical synthesis, is an important raw material for replacing the traditional petroleum synthesis chemical products, has very important position in the chemical industry in production and application, can be used as an intermediate in the petroleum chemical industry or for preparing various high-quality liquid fuels and chemicals, such as dimethyl ether, mixed alcohol, ammonia, degradable polymers and the like, and is one of important ways for preparing dimethyl ether through Fischer-Tropsch synthesis.
Compared with the traditional biomass gasification mode, CO2Less studied as a gasification medium for biomass gasification, currently mainly surrounding the CO of coal2Gasification was studied. However, this gasification has the advantage that it is not replaceable by other means, on the one hand the process is CO2The CO obtained by the reaction with the C in the biomass can be used as reducing gas, energy source gas, basic raw materials of the liquefaction process and the like. On the other hand, CO2Is a main gas influencing the greenhouse effect, and can be used for treating CO in the environment if the technology can be effectively utilized2To reduce the CO in the environment2And (4) content. CO of biomass2The gasification technology has research value.
Disclosure of Invention
Hair brushAiming at overcoming the defects of the prior art, the invention provides a device and a method for preparing synthesis gas by chemical looping combustion, which save extra CO2And the preparation process of the water vapor utilizes the characteristics of gas products generated by the chemical chain combustion of the biomass and large heat generation, and realizes the full utilization of energy of the whole reaction.
In order to achieve the purpose, the invention adopts the following technical scheme:
a device for preparing synthesis gas by chemical looping combustion comprises a chemical looping combustion chamber, a biomass pyrolysis chamber and an oxygen carrier regeneration device, wherein the biomass pyrolysis chamber is arranged outside the chemical looping combustion chamber and positioned at the upper part of the chemical looping combustion chamber; the top of the chemical-looping combustion chamber is provided with a biomass oxygen carrier mixture inlet, the lower part of the chemical-looping combustion chamber is provided with a screen which is obliquely placed, the screen divides the lower part of the chemical-looping combustion chamber into an ash collecting area and an oxygen carrier storage area, the ash collecting area is provided with a first ash outlet, and the oxygen carrier storage area is connected with an oxygen carrier first return pipe; the upper part of the biomass pyrolysis chamber is provided with a biomass feed inlet, and the lower part of the biomass pyrolysis chamber is provided with a second gas outlet and a second ash outlet; the oxygen carrier regeneration device comprises a cyclone separator and an oxygen carrier regeneration pipe, wherein a heating device is coated outside the oxygen carrier regeneration pipe, an outlet of the cyclone separator is communicated with the top of the chemical-looping combustion chamber through an oxygen carrier second return pipe, one end of the oxygen carrier regeneration pipe is connected with an inlet of the cyclone separator, the other end of the oxygen carrier regeneration pipe is communicated with an oxygen carrier first return pipe, and an air inlet is formed in the end part, far away from the cyclone separator, of the oxygen carrier regeneration pipe; the top of the chemical-looping combustion chamber is provided with a first gas outlet and is communicated with the top of the biomass pyrolysis chamber through a pipeline, and a heating device is arranged on the outer wall of the part, located in the biomass pyrolysis chamber, of the chemical-looping combustion chamber.
Specifically, a plurality of downward-inclined baffle plates are uniformly distributed at intervals on the upper part of the inner wall of the chemical-looping combustion chamber, the baffle plates are provided with a plurality of layers, and the tail end of the upper-layer baffle plate is positioned above the middle part of the lower-layer baffle plate. The baffle plate has the functions of slowing down the falling speed of the raw materials entering from the biomass oxygen carrier mixture inlet, prolonging the reaction time of the raw materials (biomass and oxygen carriers) in the chemical-looping combustion chamber, enabling the raw materials to fully react, and being beneficial to heat transfer.
Furthermore, an inserting plate for controlling the communication or the closing of the first return pipe and the oxygen carrier storage area is arranged at the connecting position of the first return pipe and the oxygen carrier storage area.
The method for preparing the synthesis gas by using the device to carry out chemical looping combustion comprises the following steps:
1) controlling the temperature in the chemical-looping combustion chamber to be 800-900 ℃ by a heating device; mixing raw material biomass and an oxygen carrier, then entering a chemical-looping combustion chamber from a biomass oxygen carrier mixture inlet, carrying out chemical-looping combustion reaction in a falling process, enabling small particle products after the combustion reaction to pass through a screen and fall into an ash collecting area, and enabling large particle products after the combustion reaction to slide into an oxygen carrier storage area from the screen; at the same time, CO is produced by the combustion reaction2Gas and water vapor are discharged from the first gas outlet and enter the biomass pyrolysis chamber through a pipeline, the gas and the water vapor are subjected to pyrolysis reaction with biomass entering from the biomass feed inlet, and synthesis gas generated by the pyrolysis reaction is discharged from the second gas outlet;
2) controlling the temperature in the oxygen carrier regeneration pipe to be 850-950 ℃ by a heating device; discharging large-particle products in the oxygen carrier storage region from the first return pipe of the oxygen carrier, feeding the large-particle products into the oxygen carrier regeneration pipe, mixing the large-particle products with air entering from the air inlet, and conveying the mixed large-particle products into the cyclone separator, wherein the large-particle products and the air are subjected to exothermic reaction in the process of conveying the mixed large-particle products into the cyclone separator to realize the regeneration of the oxygen carrier;
3) the regenerated oxygen carrier enters the chemical-looping combustion chamber through the cyclone separator and the second oxygen carrier return pipe to participate in the secondary combustion reaction, so that the cyclic utilization is realized.
Specifically, the biomass is crop straws (such as wheat straws, corn straws and the like), and the oxygen carrier is ferric oxide particles.
The device mainly comprises two reaction processes:
1. chemical looping combustion process of biomass. Chemical chain combustion is a novel combustion mode, and has high efficiency and internal separation of CO2Low NO contentxAnd the like. The chemical looping combustion system comprises two connected chemical looping combustion chambers and an oxygen carrier regeneration device, and solid oxygen carrier particles circulate between the chemical looping combustion chambers and the oxygen carrier regeneration device. The fuel is oxidized by the lattice oxygen of the oxygen carrier particles after entering the chemical-looping combustion chamber, and CO is mainly generated after the fuel is completely oxidized2And a small amount of water vapor. Because no air is diluted, the purity of the product is very high, and CO with higher purity can be obtained after water vapor is condensed2Without additional energy consumption for separation, the resulting CO2Can be used for other purposes. The reaction formula is as follows:
the regeneration reaction formula of the oxygen carrier is as follows:
2. biomass and chemical chain combustion product CO2And H2Pyrolysis reaction process of O (gas). The biomass is subjected to chemical looping combustion in a chemical looping combustion chamber to produce a product gas (mainly CO)2And H2O), may be passed directly to the biomass pyrolysis chamber outside the combustion reactor. The heat released by the oxygen carrier during regeneration in the oxygen carrier regeneration device can be biomass and CO in the outer biomass pyrolysis chamber2And H2The redox reaction that occurs with O provides part of the heat. Excess CO2Can be used for direct sealing in later period. The main chemical reactions that occur are:
the innovation points of the invention are mainly as follows: 1) major gaseous product (CO) of biomass chemical looping combustion2+H2O) is directly introduced into an external biomass pyrolysis chamber and is used as a gas raw material for biomass pyrolysis for biomass gasification; 2) The heat emitted by the oxygen carrier during regeneration in the biomass chemical-looping combustion process is carried into the chemical-looping combustion chamber by the oxygen carrier, partial heat is supplemented for the biomass gasification reaction in the external biomass pyrolysis chamber, and the oxygen carrier simultaneously plays a role of a heat carrier, so that the cascade utilization of chemical energy is realized, and the energy utilization rate of a system is obviously improved; 3) the regeneration and the cyclic utilization of the oxygen carrier are realized, and the raw materials are saved; 4) the design of the baffle plate in the chemical-looping combustion chamber prolongs the reaction time of the raw materials in the chemical-looping combustion chamber, so that the raw materials are fully reacted, and the heat transfer is facilitated. 5) The design of the screen can realize the separation of large and small particle products after chemical looping combustion reaction, thereby facilitating the regeneration and the recycling of large particle oxygen carriers.
The device has simple structure and convenient operation, realizes the repeated recycling of the oxygen carrier of the raw material, and the gas product generated by the chemical chain combustion is directly used as the gas raw material for biomass pyrolysis to prepare and synthesize the synthesis gas. The invention omits extra CO2And H2In the O preparation process, the full utilization of energy of the whole reaction is realized by utilizing the characteristics of gas products generated by the chemical chain combustion of the biomass and the generation of a large amount of heat.
Drawings
FIG. 1 is a schematic structural diagram of an apparatus for preparing synthesis gas by chemical looping combustion according to the present invention.
Detailed Description
The technical solution of the present invention is further described in detail with reference to the following examples, but the scope of the present invention is not limited thereto.
Example 1
As shown in fig. 1, an apparatus for preparing synthesis gas by chemical looping combustion comprises a chemical looping combustion chamber 7, a biomass pyrolysis chamber 8 which is arranged outside the chemical looping combustion chamber 7 and positioned at the upper part of the chemical looping combustion chamber 7, and an oxygen carrier regeneration device; wherein, the top of the chemical chain combustion chamber 7 is provided with a biomass oxygen carrier mixture inlet 15, the lower part in the chemical chain combustion chamber 7 is provided with a screen 3 which is obliquely arranged, the upper end of the screen 3 is fixed on the side wall of the chemical chain combustion chamber 7, and the lower end of the screen 3 is fixed on the chemical chainThe bottom surface of the combustion chamber 7, the screen 3 divides the lower part of the chemical-looping combustion chamber 7 into two parts of an ash collecting area 5 and an oxygen carrier storage area 2, the ash collecting area 5 is provided with a first ash outlet 4, and the oxygen carrier storage area 2 is connected with an oxygen carrier first return pipe 21; the upper part of the biomass pyrolysis chamber 8 is provided with two biomass feed inlets (namely a first biomass feed inlet 9 and a second biomass feed inlet 16), and the lower part of the biomass pyrolysis chamber 8 is provided with a second gas outlet 6 and a second ash outlet 22; the oxygen carrier regeneration device comprises a cyclone separator 12 and an oxygen carrier regeneration pipe 17, wherein the outside of the oxygen carrier regeneration pipe is coated with a first heating device 14, the outlet of the cyclone separator 12 is communicated with the top of the chemical-looping combustion chamber 7 through an oxygen carrier second return pipe 10, one end of the oxygen carrier regeneration pipe 17 is connected with the inlet of the cyclone separator 12, the other end of the oxygen carrier regeneration pipe 17 is communicated with an oxygen carrier first return pipe 21, and the end part of the oxygen carrier regeneration pipe 17, far away from the cyclone separator 12, is provided with an air inlet 20; the top of the chemical looping combustion chamber 7 is provided with a first gas outlet and is communicated with the top of the biomass pyrolysis chamber 8 through a pipeline (for example, a pipeline directly connected with the first gas outlet is divided into three branches, two of the branches 11 are connected in parallel and are communicated with the top of the biomass pyrolysis chamber 8, and the rest branch 13 is provided with a valve for collecting redundant CO2Gas and steam) on the outer wall of the portion of the chemical looping combustion chamber 7 located inside the biomass pyrolysis chamber 8 is provided with a second heating device 19. A plurality of downward-inclined baffle plates 18 are uniformly distributed at intervals on the upper part of the inner wall of the chemical chain combustion chamber 7, the baffle plates 18 are arranged in 4 layers, and the tail end of the upper layer baffle plate is positioned above the middle part of the lower layer baffle plate. An inserting plate 1 for controlling the connection or the closure of the oxygen carrier first return pipe 21 and the oxygen carrier storage area 2 is arranged at the connection position of the two.
The first heating device 14 and the second heating device 19 may be conventional electric heating devices, such as an electric heating tube, an electric furnace wire, etc., as long as the heating within the range of 800-.
The method for preparing the synthesis gas by using the device to carry out chemical looping combustion comprises the following steps:
1) controlling the temperature in the chemical-looping combustion chamber 7 to be about 850 ℃ through a second heating device 19; mixing raw material biomass (such as wheat straw, corn straw and the like, which needs to be smashed in advance to be beneficial to complete reaction combustion) and an oxygen carrier (ferric oxide particles, the particle size of which is larger than that of the biomass particles), then feeding the mixture into a chemical-looping combustion chamber 7 from a biomass oxygen carrier mixture inlet 15, and carrying out chemical-looping combustion reaction in the falling process. When the biomass and the oxygen carrier are completely combusted and reacted, the remaining biomass ash and the oxygen carrier continuously fall, and when the biomass ash and the oxygen carrier are contacted with the screen 3, due to the fact that the granularity of the oxygen carrier and the biomass ash is different, small-grained biomass ash passes through the screen 3 and falls into an ash collecting area 5 (can be discharged through a first ash outlet 4), and oxygen carriers with larger granularity slide into an oxygen carrier storage area 2 from the screen 3;
at the same time, the combustion reaction produces CO as a product2The gas and the steam are discharged from the first gas outlet and enter the biomass pyrolysis chamber 8 through two branches 11 to be used as gasifying agents (surplus CO)2Gas and steam are collected through a branch 13, and residual CO is obtained after the steam is condensed and separated2Compressed and sealed), and the biomass entering from the first biomass inlet 9 and the second biomass inlet 16 is subjected to pyrolysis reaction, and the synthesis gas generated by the pyrolysis reaction is discharged from the second gas outlet 6 (the solid impurities generated in the biomass pyrolysis chamber 8 can be periodically discharged through the second ash outlet 22);
2) the temperature in the oxygen carrier regenerating pipe 17 is controlled to be about 900 ℃ by the first heating device 14; the oxygen carrier particles collected in the oxygen carrier storage area 2 are discharged from the oxygen carrier first return pipe 21, enter the oxygen carrier regeneration pipe 17, are mixed with the preheated high-temperature air entering from the air inlet 20 and then are conveyed into the cyclone separator 12, the oxygen carrier particles and the air are subjected to oxidation exothermic reaction in the process of conveying the mixture into the cyclone separator 12, the lattice oxygen of the oxygen carrier is supplemented, the regeneration of the oxygen carrier is realized, and the separation of the air and the regenerated oxygen carrier is realized through the cyclone separator 12;
3) the regenerated oxygen carrier reenters the chemical-looping combustion chamber 7 through the cyclone separator 12 and the oxygen carrier second return pipe 10 to participate in the secondary combustion reaction, so that the recycling of the oxygen carrier is realized. Meanwhile, heat released by the oxidation exothermic reaction of the oxygen carrier and air is directly brought into the chemical-looping combustion chamber 7 by the oxygen carrier, the heat is supplemented for biomass gasification in the outer-layer biomass pyrolysis chamber 8, the oxygen carrier simultaneously plays a role of a heat carrier, the cascade utilization of chemical energy is realized, and the energy utilization rate of the system is obviously improved.
Claims (3)
1. The device for preparing the synthesis gas by chemical looping combustion is characterized by comprising a chemical looping combustion chamber, a biomass pyrolysis chamber and an oxygen carrier regeneration device, wherein the biomass pyrolysis chamber is arranged outside the chemical looping combustion chamber and positioned at the upper part of the chemical looping combustion chamber; the top of the chemical-looping combustion chamber is provided with a biomass oxygen carrier mixture inlet, the lower part of the chemical-looping combustion chamber is provided with a screen which is obliquely placed, the screen divides the lower part of the chemical-looping combustion chamber into an ash collecting area and an oxygen carrier storage area, the ash collecting area is provided with a first ash outlet, and the oxygen carrier storage area is connected with an oxygen carrier first return pipe; the upper part of the biomass pyrolysis chamber is provided with a biomass feed inlet, and the lower part of the biomass pyrolysis chamber is provided with a second gas outlet and a second ash outlet; the oxygen carrier regeneration device comprises a cyclone separator and an oxygen carrier regeneration pipe, wherein a heating device is coated outside the oxygen carrier regeneration pipe, an outlet of the cyclone separator is communicated with the top of the chemical-looping combustion chamber through an oxygen carrier second return pipe, one end of the oxygen carrier regeneration pipe is connected with an inlet of the cyclone separator, the other end of the oxygen carrier regeneration pipe is communicated with an oxygen carrier first return pipe, and an air inlet is formed in the end part, far away from the cyclone separator, of the oxygen carrier regeneration pipe; the top of the chemical-looping combustion chamber is provided with a first gas outlet and is communicated with the top of the biomass pyrolysis chamber through a pipeline, and a heating device is arranged on the outer wall of the chemical-looping combustion chamber part in the biomass pyrolysis chamber;
a plurality of downward-inclined baffle plates are uniformly distributed at intervals on the upper part of the inner wall of the chemical-looping combustion chamber, the baffle plates are arranged in multiple layers, and the tail end of the upper layer baffle plate is positioned above the middle part of the lower layer baffle plate;
and an inserting plate for controlling the communication or the closing of the first return pipe and the oxygen carrier storage area is arranged at the joint of the first return pipe and the oxygen carrier storage area.
2. A method for producing synthesis gas by chemical looping combustion using the apparatus of claim 1, comprising the steps of:
1) controlling the temperature in the chemical-looping combustion chamber to be 800-900 ℃ by a heating device; mixing raw material biomass and an oxygen carrier, then entering a chemical-looping combustion chamber from a biomass oxygen carrier mixture inlet, carrying out chemical-looping combustion reaction in a falling process, enabling small particle products after the combustion reaction to pass through a screen and fall into an ash collecting area, and enabling large particle products after the combustion reaction to slide into an oxygen carrier storage area from the screen; at the same time, CO is produced by the combustion reaction2Gas and water vapor are discharged from the first gas outlet and enter the biomass pyrolysis chamber through a pipeline, the gas and the water vapor are subjected to pyrolysis reaction with biomass entering from the biomass feed inlet, and synthesis gas generated by the pyrolysis reaction is discharged from the second gas outlet;
2) controlling the temperature in the oxygen carrier regeneration pipe to be 850-950 ℃ by a heating device; discharging large-particle products in the oxygen carrier storage region from the first return pipe of the oxygen carrier, feeding the large-particle products into the oxygen carrier regeneration pipe, mixing the large-particle products with air entering from the air inlet, and conveying the mixed large-particle products into the cyclone separator, wherein the large-particle products and the air are subjected to exothermic reaction in the process of conveying the mixed large-particle products into the cyclone separator to realize the regeneration of the oxygen carrier;
3) the regenerated oxygen carrier enters the chemical-looping combustion chamber through the cyclone separator and the second oxygen carrier return pipe to participate in the secondary combustion reaction, so that the cyclic utilization is realized.
3. The method of claim 2, wherein the biomass is crop straw and the oxygen carrier is iron trioxide pellets.
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| CN109181779B (en) * | 2018-09-14 | 2021-07-27 | 东南大学 | Chemical chain oil-gas co-production and carbon dioxide reduction method |
| CN110643382A (en) * | 2019-10-28 | 2020-01-03 | 华南理工大学 | Biomass oil-gas co-production device and method based on chemical chain |
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