CN114479946A - Pulverized coal conveying method, pulverized coal conveying unit and application - Google Patents
Pulverized coal conveying method, pulverized coal conveying unit and application Download PDFInfo
- Publication number
- CN114479946A CN114479946A CN202210098049.XA CN202210098049A CN114479946A CN 114479946 A CN114479946 A CN 114479946A CN 202210098049 A CN202210098049 A CN 202210098049A CN 114479946 A CN114479946 A CN 114479946A
- Authority
- CN
- China
- Prior art keywords
- pulverized coal
- coal
- carbon dioxide
- nitrogen
- feeding system
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000003245 coal Substances 0.000 title claims abstract description 270
- 238000000034 method Methods 0.000 title claims abstract description 26
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 244
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 199
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 122
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 122
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 97
- 238000002309 gasification Methods 0.000 claims abstract description 37
- 239000000843 powder Substances 0.000 claims description 103
- 239000002817 coal dust Substances 0.000 claims description 21
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 12
- JCXJVPUVTGWSNB-UHFFFAOYSA-N nitrogen dioxide Inorganic materials O=[N]=O JCXJVPUVTGWSNB-UHFFFAOYSA-N 0.000 claims description 10
- 238000002716 delivery method Methods 0.000 claims 2
- 239000007789 gas Substances 0.000 abstract description 36
- 239000012159 carrier gas Substances 0.000 abstract description 15
- 238000000746 purification Methods 0.000 abstract description 11
- 230000015572 biosynthetic process Effects 0.000 abstract description 10
- 238000003786 synthesis reaction Methods 0.000 abstract description 10
- 238000005265 energy consumption Methods 0.000 abstract description 6
- 239000000203 mixture Substances 0.000 description 9
- 229910052799 carbon Inorganic materials 0.000 description 7
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 6
- 238000004064 recycling Methods 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 4
- 229910001873 dinitrogen Inorganic materials 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 3
- 230000005484 gravity Effects 0.000 description 3
- 238000004080 punching Methods 0.000 description 3
- 239000013589 supplement Substances 0.000 description 3
- 238000005406 washing Methods 0.000 description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- 229910002091 carbon monoxide Inorganic materials 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 239000000571 coke Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000005243 fluidization Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 239000011261 inert gas Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000003034 coal gas Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000004449 solid propellant Substances 0.000 description 1
- -1 steam Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Images
Classifications
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G53/00—Conveying materials in bulk through troughs, pipes or tubes by floating the materials or by flow of gas, liquid or foam
- B65G53/04—Conveying materials in bulk pneumatically through pipes or tubes; Air slides
- B65G53/16—Gas pressure systems operating with fluidisation of the materials
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G53/00—Conveying materials in bulk through troughs, pipes or tubes by floating the materials or by flow of gas, liquid or foam
- B65G53/34—Details
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G53/00—Conveying materials in bulk through troughs, pipes or tubes by floating the materials or by flow of gas, liquid or foam
- B65G53/34—Details
- B65G53/40—Feeding or discharging devices
- B65G53/50—Pneumatic devices
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G2201/00—Indexing codes relating to handling devices, e.g. conveyors, characterised by the type of product or load being conveyed or handled
- B65G2201/04—Bulk
-
- 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
- C10J2200/00—Details of gasification apparatus
- C10J2200/15—Details of feeding means
-
- 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
- C10J2300/093—Coal
-
- 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
- C10J2300/0969—Carbon dioxide
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/141—Feedstock
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Combustion & Propulsion (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Chemistry (AREA)
- Air Transport Of Granular Materials (AREA)
Abstract
The invention discloses a pulverized coal conveying method, a pulverized coal conveying unit and application, and relates to the technical field of pulverized coal gasification. The pulverized coal conveying method comprises the steps of introducing nitrogen into a pulverized coal locking hopper, carrying pulverized coal into a pulverized coal feeding system, and simultaneously introducing carbon dioxide into the pulverized coal feeding system and a pulverized coal conveying pipeline respectively, so that the pulverized coal flows out of the pulverized coal feeding system and is conveyed to a gasification unit through the pulverized coal conveying pipeline. The invention provides a pulverized coal conveying method using carbon dioxide and nitrogen as pulverized coal carrier gas, wherein most of nitrogen is discharged in a pulverized coal lock hopper by using the nitrogen as lock hopper stamping gas, so that a large amount of nitrogen does not enter a gasification unit, the purification efficiency of synthesis gas is not influenced, and the energy consumption is increased. The pulverized coal can be conveyed to a pulverized coal feeding system and mixed with carbon dioxide, the carbon dioxide replaces nitrogen in the pulverized coal feeding system, the content of the nitrogen entering a gasification unit is further reduced, and the stable operation of the system is ensured.
Description
Technical Field
The invention relates to the technical field of pulverized coal gasification, in particular to a pulverized coal conveying method, a pulverized coal conveying unit and application.
Background
Gasification of coal refers to a process in which organic matter in coal and a gasifying agent (such as steam, air and/or oxygen) undergo a series of chemical reactions at a certain temperature and pressure in a specific apparatus to convert solid coal into a synthesis gas containing combustible gases such as carbon monoxide, hydrogen, methane, etc., and non-combustible gases such as carbon dioxide, nitrogen, etc.
The existing coal gasification device generally adopts coal powder as a reaction raw material so as to improve the coal gasification efficiency. Because the granularity of the coal dust is small, the surface of the coal dust can absorb a large amount of air, so that the coal dust has fluidity and is generally conveyed into a coal gasification device by using air force for reaction. The coal powder conveying unit of the existing coal gasification device mostly adopts a single gas as a carrier gas of a coal powder lock hopper and a coal powder conveying system, so that the using amount of the gas is large. When nitrogen is independently used as inert gas, the nitrogen enters a synthesis gas purification system along with synthesis gas, so that the purification efficiency of the synthesis gas is reduced, and the energy consumption is increased; and the carbon dioxide is used as inert gas, so that the use and emission of the carbon dioxide are greatly increased.
In view of this, the invention is particularly proposed.
Disclosure of Invention
The invention aims to provide a pulverized coal conveying method, a pulverized coal conveying unit and application, which can reduce the use of pulverized coal carrier gas and ensure the stable operation of a system.
The invention is realized by the following steps:
in a first aspect, the invention provides a pulverized coal conveying method, which comprises the steps of introducing nitrogen into a pulverized coal lock hopper, carrying pulverized coal into a pulverized coal feeding system, and simultaneously introducing carbon dioxide into the pulverized coal feeding system and a pulverized coal conveying pipeline respectively, so that the pulverized coal flows out of the pulverized coal feeding system and is conveyed to a gasification unit through the pulverized coal conveying pipeline.
In a second aspect, the invention provides a pulverized coal conveying unit, which is suitable for the pulverized coal conveying method in the foregoing embodiment, and includes a nitrogen buffer tank, a carbon dioxide buffer tank, a pulverized coal lock hopper, a pulverized coal feeding system, and a pulverized coal conveying pipeline.
The nitrogen buffer tank is connected with the coal powder lock hopper through a pipeline, and the coal powder lock hopper, the carbon dioxide buffer tank and the coal powder conveying pipeline are all connected with the coal powder feeding system, so that nitrogen and carbon dioxide enter the coal powder feeding system and convey coal powder to the coal powder conveying pipeline.
In a third aspect, the present invention provides a method for conveying pulverized coal or a unit for conveying pulverized coal of the foregoing embodiments for use in the field of coal gasification.
The invention has the following beneficial effects:
the invention provides a pulverized coal conveying mode, a unit and application, wherein nitrogen and carbon dioxide are jointly used as pulverized coal carrier gas, pulverized coal is conveyed at the same time, nitrogen is further used as lock hopper punching gas and pulverized coal conveying gas, the pulverized coal is conveyed to a pulverized coal feeding system, most of nitrogen is discharged out of the pulverized coal feeding system as lock hopper punching gas, carbon dioxide is introduced into the pulverized coal feeding system to replace nitrogen, and the content of nitrogen entering a gasification unit is further reduced. The invention adopts nitrogen and carbon dioxide as the coal powder carrier gas, thereby not only reducing the use amount of nitrogen and carbon dioxide, but also effectively overcoming the defects of low purification efficiency of the synthesis gas and high energy consumption caused by using nitrogen as the coal powder carrier gas, leading the nitrogen as little as possible to enter the gasification unit, greatly reducing the content of nitrogen in the synthesis gas, leading the system to be stably operated, and avoiding the problem of unstable operation of the device caused by overlarge or insufficient flow because of singly using one coal powder carrier gas.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic structural diagram of a pulverized coal conveying unit provided in embodiment 1.
An icon: 100-a pulverized coal conveying unit; 101-nitrogen buffer tank; 102-a carbon dioxide buffer tank; 103-coal powder locking bucket; 104-a pulverized coal feed system; 105-pulverized coal conveying pipeline.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
The specific embodiments of the present invention are as follows:
coal gas is widely applied to civil fuel, industrial fuel, chemical raw materials and the like, and coal gasification refers to a process of converting solid fuels such as coal, coke, semi-coke and the like into gas products and a small amount of residues by reacting with a gasification agent under the conditions of high temperature, normal pressure or pressurization.
Before coal gasification, coal needs to be introduced into a gasification unit, the conventional coal powder conveying method mainly uses gas conveying, generally, the amount of coal powder to be conveyed is large, the required conveying gas is large in use amount, and for a coal gasification device, a large amount of conveying gas, such as nitrogen, enters a synthesis gas purification system along with synthesis gas, so that the synthesis gas purification efficiency is reduced, and the energy consumption is increased. For the external environment, a large amount of conveying gas, such as carbon dioxide, is discharged out of the system during and after the conveying of the pulverized coal, which is not favorable for environmental protection. Therefore, it is desirable to provide a new method for conveying pulverized coal to solve the above problems.
In a first aspect, the invention provides a pulverized coal conveying method, which comprises the steps of introducing nitrogen into a pulverized coal lock hopper, carrying pulverized coal into a pulverized coal feeding system, and simultaneously introducing carbon dioxide into the pulverized coal feeding system and a pulverized coal conveying pipeline respectively, so that the pulverized coal flows out of the pulverized coal feeding system and is conveyed to a gasification unit through the pulverized coal conveying pipeline.
According to the invention, nitrogen and carbon dioxide are jointly used as coal powder carrier gas, coal powder is simultaneously conveyed, and nitrogen is further used as lock hopper punching gas, so that on one hand, the coal powder is conveyed to a coal powder feeding system from the coal powder lock hopper, on the other hand, most of nitrogen is discharged in the coal powder lock hopper and cannot enter a subsequent gasification unit along with the coal powder for treatment, the defects of low synthetic gas purification efficiency and high energy consumption caused by the fact that nitrogen is used as the coal powder carrier gas are effectively overcome, the nitrogen enters the gasification unit as little as possible, the content of nitrogen in the synthetic gas is greatly reduced, and the system can stably operate. The nitrogen content of the coal powder carrier gas is reduced, the stable conveying of the coal powder is ensured by introducing carbon dioxide with a certain flow into the coal powder feeding system, and the carbon dioxide is further directly conveyed to the coal powder conveying pipeline so as to improve the conveying efficiency of the coal powder. Simultaneously, carbon dioxide replaces nitrogen in the buggy charge-in system, and the nitrogen content that gets into the gasification unit further reduces, and the carbon dioxide content that gets into the system is higher, because carbon in the buggy reacts with carbon dioxide and can generate carbon monoxide, consequently utilizes a large amount of carbon dioxide to carry the buggy to the reaction efficiency that the gasification unit can also improve the buggy, guarantees the steady operation of system.
In addition, a small amount of nitrogen exists in the pulverized coal feeding system, so that the using amount of carbon dioxide is relatively reduced, and meanwhile, the content of nitrogen serving as pulverized coal carrier gas is low, so that a large amount of nitrogen does not need to be introduced into the pulverized coal feeding system, the using amount of nitrogen is correspondingly reduced, and the problem of unstable operation of a device caused by overlarge or insufficient flow due to the fact that one pulverized coal carrier gas is independently used is solved.
In an alternative embodiment, the nitrogen is sourced from a nitrogen pipeline in the battery limits, buffered in a nitrogen buffer tank and then introduced into the pulverized coal lock hopper. The nitrogen is stored in the nitrogen buffer tank, so that the problem of unstable operation of the device caused by too large or insufficient nitrogen flow can be effectively prevented.
In an alternative embodiment, the carbon dioxide is sourced from a carbon dioxide line in the battery limits and is buffered in a carbon dioxide buffer tank before being passed to the pulverized coal feed system. The problem of unstable operation of the device caused by overlarge or insufficient carbon dioxide flow can be effectively prevented by storing the carbon dioxide in the carbon dioxide buffer tank.
In an alternative embodiment, the carbon dioxide in the carbon dioxide line of the battery limits is sourced from a cryogenic methanol wash unit. The carbon dioxide used in the invention is directly recycled after purification, absorption and analysis without additional supplement, thereby realizing the recycling and recycling of the carbon dioxide and greatly reducing the emission of the carbon dioxide.
In a second aspect, the invention provides a pulverized coal conveying unit, which is suitable for the pulverized coal conveying method in the foregoing embodiment, and includes a nitrogen buffer tank, a carbon dioxide buffer tank, a pulverized coal lock hopper, a pulverized coal feeding system, and a pulverized coal conveying pipeline.
The nitrogen buffer tank is connected with the coal powder locking hopper through a pipeline, and the coal powder locking hopper, the carbon dioxide buffer tank and the coal powder conveying pipeline are all connected with the coal powder feeding system, so that nitrogen and carbon dioxide enter the coal powder feeding system and convey coal powder to the coal powder conveying pipeline.
In some embodiments, the nitrogen buffer tank and the carbon dioxide buffer tank may be cylindrical tanks, rectangular parallelepipeds, cubes, or other shapes as long as the gas storage and buffering functions of nitrogen or carbon dioxide can be achieved, which is not limited in the present invention.
Optionally, the structures of the nitrogen buffer tank and the carbon dioxide buffer tank may be the same or different, and the structures of the nitrogen buffer tank and the carbon dioxide buffer tank are not limited in the present invention.
In some embodiments, the coal powder locking hopper and the coal powder feeding system may be in the form of a cylinder with a conical bottom or a cuboid with a conical bottom, as long as the coal powder can be stored and transported, which is not limited in the present invention.
Optionally, the structures of the pulverized coal locking hopper and the pulverized coal feeding system can be the same or different, and the structures of the pulverized coal locking hopper and the pulverized coal feeding system are not limited in the invention.
In the preferred embodiment, buggy lock fill, carbon dioxide buffer tank and buggy conveying pipeline all are connected with buggy charge-in system and include: the coal powder locking hopper is communicated with the upper part of the coal powder feeding system through a pipeline and is used for inputting coal powder from the upper part of the coal powder feeding system and enabling the coal powder to flow downwards.
The carbon dioxide buffer tank is communicated with the middle part of the pulverized coal feeding system through a pipeline, so that carbon dioxide is blown upwards from the conical part to fluidize pulverized coal. As the coal dust enters from the top of the coal dust feeding system and flows downwards, the carbon dioxide is blown upwards from the middle part of the coal dust feeding system and is in countercurrent contact with the coal dust, the contact surface is large, and the fluidization efficiency is high.
The coal powder conveying pipeline is communicated with the bottom of the coal powder feeding system, and the coal powder swept by the carbon dioxide falls into the bottom of the coal powder feeding system under the action of gravity and flows out of the coal powder conveying pipeline at the bottom of the coal powder feeding system to enter the gasification unit for treatment.
In other embodiments, the connection mode of the pulverized coal lock hopper, the carbon dioxide buffer tank and the pulverized coal conveying pipeline with the pulverized coal feeding system is not limited to the above connection mode, and the above is only a preferred embodiment of the present invention.
In an alternative embodiment, the nitrogen buffer tank is communicated with a nitrogen pipeline from the battery limits and is used for collecting and delivering nitrogen, so that unstable operation of the device caused by excessive or insufficient nitrogen flow is prevented. The carbon dioxide buffer tank is communicated with a carbon dioxide pipeline from a boundary area and is used for collecting and delivering carbon dioxide, so that unstable operation of the device caused by excessive or insufficient carbon dioxide flow is prevented.
In an optional embodiment, the method further comprises the step of communicating the carbon dioxide buffer tank with the pulverized coal conveying pipeline, and the carbon dioxide buffer tank is used for directly inputting carbon dioxide into the pulverized coal conveying pipeline to be used as middle accelerating gas injected into the pulverized coal conveying pipeline, so that the conveying efficiency of pulverized coal is improved, and the pulverized coal-carbon dioxide-nitrogen mixture is accelerated to enter the gasification unit for treatment.
In a third aspect, the present invention provides a method for conveying pulverized coal or a unit for conveying pulverized coal of the foregoing embodiments for use in the field of coal gasification.
The features and properties of the present invention are described in further detail below with reference to examples.
Example 1
Referring to fig. 1, the present embodiment provides a pulverized coal conveying unit 100, which includes a nitrogen buffer tank 101, a carbon dioxide buffer tank 102, a pulverized coal lock hopper 103, a pulverized coal feeding system 104, and a pulverized coal conveying pipeline 105.
In this embodiment, the nitrogen buffer tank 101 and the carbon dioxide buffer tank 102 are both cylindrical tanks, and in other embodiments, the nitrogen buffer tank 101 and the carbon dioxide buffer tank 102 may be rectangular parallelepiped, cube, or other shapes as long as the gas storage and buffer functions of nitrogen or carbon dioxide can be achieved, which is not limited in the present invention.
Alternatively, the structures of the nitrogen buffer tank 101 and the carbon dioxide buffer tank 102 may be the same or different, and in this embodiment, the structures of the nitrogen buffer tank 101 and the carbon dioxide buffer tank 102 are the same.
In this embodiment, the coal powder locking bucket 103 is a cylinder with a conical bottom, and in other embodiments, the coal powder locking bucket 103 may be in other forms as long as it can store and transport coal powder, which is not limited in this disclosure.
In this embodiment, the pulverized coal feeding system 104 is a cylinder with a conical bottom, and in other embodiments, the pulverized coal feeding system 104 may have other shapes as long as it can transport the pulverized coal-carbon dioxide-nitrogen mixture, which is not limited in the present invention.
In this embodiment, the shapes of the pulverized coal lock hopper 103 and the pulverized coal feeding system 104 are similar, and in other embodiments, the shapes of the pulverized coal lock hopper 103 and the pulverized coal feeding system 104 may be different.
Further, in this embodiment, the nitrogen buffer tank 101 is connected to the pulverized coal lock 103 through a pipe, and the pulverized coal lock 103, the carbon dioxide buffer tank 102 and the pulverized coal conveying pipeline 105 are all connected to the pulverized coal feeding system 104, so that nitrogen and carbon dioxide enter the pulverized coal feeding system 104 and convey pulverized coal to the pulverized coal conveying pipeline 105.
Specifically, the coal dust lock hopper 103, the carbon dioxide buffer tank 102 and the coal dust conveying pipeline 105 are connected with the coal dust feeding system 104 and include: the coal powder lock hopper 103 is communicated with the upper part of the coal powder feeding system 104 through a pipeline and is used for inputting coal powder from the top of the coal powder feeding system 104 and enabling the coal powder to flow downwards.
The carbon dioxide buffer tank 102 is communicated with the middle part of the coal powder feeding system 104 through a pipeline, so that carbon dioxide is blown upwards from the cone part to fluidize coal powder. As the coal dust enters from the top of the coal dust feeding system 104 and flows downwards, the carbon dioxide is blown upwards from the middle of the coal dust feeding system 104 and is in countercurrent contact with the coal dust, the contact surface is large, and the fluidization efficiency is high.
The coal powder conveying pipeline 105 is communicated with the bottom of the coal powder feeding system 104, and the coal powder swept by the carbon dioxide falls into the bottom of the coal powder feeding system 104 under the action of gravity and flows out of the coal powder conveying pipeline 105 at the bottom of the coal powder feeding system 104 to enter the gasification unit for treatment.
In this embodiment, the inlet of the nitrogen buffer tank 101 communicates with a nitrogen line from the battery limits for collecting and re-transporting nitrogen, preventing unstable operation of the apparatus due to an excessive or insufficient amount of nitrogen.
The inlet of the carbon dioxide buffer tank 102 is communicated with a carbon dioxide pipeline from a boundary area and is used for collecting and delivering carbon dioxide, so that the unstable operation of the device caused by excessive or insufficient carbon dioxide flow is prevented.
In this embodiment, the method further includes communicating the carbon dioxide buffer tank 102 with the pulverized coal conveying pipeline 105, and is used for directly inputting carbon dioxide into the pulverized coal conveying pipeline 105 as a middle accelerating gas injected into the pulverized coal conveying pipeline 105, so as to improve the conveying efficiency of the pulverized coal, and accelerate the pulverized coal-carbon dioxide-nitrogen mixture to enter the gasification unit for treatment.
The present embodiment provides a pulverized coal conveying unit 100, which operates as follows:
nitrogen flows into the nitrogen buffer tank 101 from a nitrogen pipeline from a boundary area, the buffered nitrogen flows out from an outlet of the nitrogen buffer tank 101, flows into the coal powder locking hopper 103 from the middle part of the coal powder locking hopper 103 along a pipeline, and is mixed with coal powder in the coal powder locking hopper 103 to form a coal powder-nitrogen mixture. The carbon dioxide flows into a carbon dioxide pipeline from a boundary region from the low-temperature methane washing unit and further flows into the carbon dioxide buffer tank 102, and the buffered carbon dioxide flows out of an outlet of the carbon dioxide buffer tank 102 and flows into the pulverized coal feeding system 104 from the middle part of the pulverized coal feeding system 104 along a pipeline. The coal powder-nitrogen mixture flows out from an outlet of the coal powder lock hopper 103, flows into the coal powder feeding system 104 from the top of the coal powder feeding system 104 along a pipeline, is in countercurrent contact with carbon dioxide from the carbon dioxide buffer tank 102, is blown, mixed and fluidized, is partially replaced by the carbon dioxide to obtain the coal powder-carbon dioxide-nitrogen mixture, is settled under the action of gravity, and flows into the gasification unit along a coal powder conveying pipeline 105 at the bottom of the coal powder feeding system 104 to finish the conveying of the coal powder.
Example 2
The embodiment provides a pulverized coal conveying method, which can be applied to the pulverized coal conveying unit in the embodiment 1, and comprises the steps of introducing nitrogen into a pulverized coal lock hopper, carrying pulverized coal into a pulverized coal feeding system, introducing carbon dioxide into the pulverized coal feeding system, allowing the carbon dioxide to be used as fluidizing gas to react sufficiently, allowing a pulverized coal-carbon dioxide-nitrogen mixture to flow out of the pulverized coal feeding system, and conveying the mixture to a gasification unit through a pulverized coal conveying pipeline.
Specifically, nitrogen comes from a nitrogen pipeline in a boundary region, is buffered in a nitrogen buffer tank and then is introduced into a coal powder lock hopper. The nitrogen is stored in the nitrogen buffer tank, so that the problem of unstable operation of the device caused by too large or insufficient nitrogen flow can be effectively prevented.
Specifically, carbon dioxide is sourced from a carbon dioxide pipeline in a boundary region, buffered in a carbon dioxide buffer tank and then introduced into a pulverized coal feeding system. The problem of unstable operation of the device caused by overlarge or insufficient carbon dioxide flow can be effectively prevented by storing the carbon dioxide in the carbon dioxide buffer tank.
In this example, the carbon dioxide in the carbon dioxide line of the battery limits was sourced from a cryogenic methanol wash unit. The carbon dioxide used in the invention is directly recycled after purification, absorption and analysis without additional supplement, thereby realizing the recycling and recycling of the carbon dioxide and greatly reducing the emission of the carbon dioxide.
In this embodiment, in order to improve the conveying efficiency, carbon dioxide may also be used as an intermediate acceleration gas injected into the pulverized coal conveying line. The method specifically comprises the step of directly conveying carbon dioxide to a pulverized coal conveying pipeline so as to accelerate the pulverized coal-carbon dioxide-nitrogen mixture to enter a gasification unit for treatment.
In summary, the coal dust conveying method, the coal dust conveying unit and the coal dust conveying application provided by the invention at least have the following advantages:
1. through regarding nitrogen as lock fill ram gas, on the one hand carry the buggy to buggy charge-in system from the buggy lock fill, on the other hand, most nitrogen is discharged in the buggy lock fill, can not get into subsequent gasification unit along with the buggy and handle, has effectively overcome the synthetic gas purification efficiency reduction that nitrogen caused as buggy carrier gas, the not enough that the energy consumption risees, makes nitrogen as few as possible get into gasification unit, and nitrogen content in the synthetic gas reduces by a wide margin, and the system can the steady operation. The nitrogen content of the coal powder carrier gas is reduced, the stable conveying of the coal powder is ensured by introducing carbon dioxide with a certain flow into the coal powder feeding system, meanwhile, the carbon dioxide replaces the nitrogen in the coal powder feeding system, the nitrogen content entering the gasification unit is further reduced, and the stable operation of the system is ensured.
2. The carbon dioxide comes from the low-temperature methanol washing unit, does not enter the pulverized coal lock hopper, and cannot be directly discharged out of the system, but directly returns to the low-temperature methane washing unit after purification, absorption and analysis after pulverized coal conveying is finished, so that additional supplement is not needed, the recovery and recycling of the carbon dioxide are realized, and the emission of carbon dioxide gas is greatly reduced.
3. There is a small amount of nitrogen gas in the buggy charge-in system, therefore the quantity of carbon dioxide reduces relatively, and nitrogen gas is low as buggy carrier's content simultaneously, need not let in a large amount of nitrogen gas in to buggy charge-in system, therefore the quantity of nitrogen gas also corresponds the reduction, has avoided the unstable problem of device operation that leads to because of the flow is too big or not enough that a buggy carrier gas leads to of exclusive use.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A coal powder conveying method is characterized by comprising the steps of introducing nitrogen into a coal powder locking hopper, carrying coal powder into a coal powder feeding system, and simultaneously introducing carbon dioxide into the coal powder feeding system and a coal powder conveying pipeline respectively to enable the coal powder to flow out of the coal powder feeding system and be conveyed to a gasification unit through the coal powder conveying pipeline.
2. The coal dust conveying method according to claim 1, wherein the nitrogen is from a nitrogen pipeline in a battery compartment, and is buffered in a nitrogen buffer tank and then introduced into the coal dust lock hopper.
3. The coal fines delivery method of claim 1, where the carbon dioxide is sourced from a carbon dioxide line in a battery compartment and is buffered in a carbon dioxide buffer tank before being passed to the coal fines feed system.
4. The coal fines delivery method of claim 3, where the carbon dioxide in the carbon dioxide line of the battery limits is sourced from a cryogenic methanol wash unit.
5. A pulverized coal conveying unit is suitable for the pulverized coal conveying method according to any one of claims 1 to 4, and is characterized by comprising a nitrogen buffer tank, a carbon dioxide buffer tank, a pulverized coal lock hopper, a pulverized coal feeding system and a pulverized coal conveying pipeline;
the nitrogen buffer tank is connected with the coal powder locking hopper through a pipeline, and the coal powder locking hopper, the carbon dioxide buffer tank and the coal powder conveying pipeline are all connected with the coal powder feeding system, so that nitrogen and carbon dioxide enter the coal powder feeding system and convey coal powder to the coal powder conveying pipeline.
6. The pulverized coal conveying unit according to claim 5, wherein the pulverized coal lock hopper, the carbon dioxide buffer tank and the pulverized coal conveying pipeline are connected with the pulverized coal feeding system and comprise: the pulverized coal locking hopper is communicated with the upper part of the pulverized coal feeding system through a pipeline;
the carbon dioxide buffer tank is communicated with the middle part of the coal powder feeding system through a pipeline, so that carbon dioxide is blown upwards from the cone part to fluidize coal powder;
the coal powder conveying pipeline is communicated with the bottom of the coal powder feeding system and is used for conveying coal powder.
7. The pulverized coal conveying unit according to claim 5, characterized in that the nitrogen buffer tank is in communication with a nitrogen line from a battery limits and the carbon dioxide buffer tank is in communication with a carbon dioxide line from a battery limits.
8. The pulverized coal conveying unit according to claim 5, further comprising communicating the carbon dioxide buffer tank with the pulverized coal conveying pipeline to directly convey carbon dioxide to accelerate the flow of pulverized coal.
9. The pulverized coal conveying unit according to claim 5, wherein the nitrogen buffer tank and the carbon dioxide buffer tank include at least one of a cylinder, a rectangular parallelepiped, and a cube.
10. Use of the coal dust conveying method according to any one of claims 1 to 5 or the coal dust conveying unit according to any one of claims 6 to 9 in the field of coal gasification.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210098049.XA CN114479946A (en) | 2022-01-27 | 2022-01-27 | Pulverized coal conveying method, pulverized coal conveying unit and application |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210098049.XA CN114479946A (en) | 2022-01-27 | 2022-01-27 | Pulverized coal conveying method, pulverized coal conveying unit and application |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114479946A true CN114479946A (en) | 2022-05-13 |
Family
ID=81477434
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210098049.XA Pending CN114479946A (en) | 2022-01-27 | 2022-01-27 | Pulverized coal conveying method, pulverized coal conveying unit and application |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114479946A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1506699A (en) * | 1976-02-26 | 1978-04-12 | Metallgesellschaft Ag | Process for charging a pressure reactor for gasifying coa |
| DE102007020294A1 (en) * | 2007-04-30 | 2008-11-13 | Siemens Ag | Co-use of carbon dioxide and nitrogen in a component of a dust injection system for pulverized coal gasification |
| CN103113925A (en) * | 2013-02-20 | 2013-05-22 | 上海锅炉厂有限公司 | Powdered coal pressure dense-phase conveying device and method of dry coal dust pressure gasification |
| CN203624577U (en) * | 2013-11-15 | 2014-06-04 | 陕西延长石油（集团）有限责任公司碳氢高效利用技术研究中心 | Pneumatic conveying device of coal dust |
| CN109456799A (en) * | 2018-11-19 | 2019-03-12 | 黔西县黔希煤化工投资有限责任公司 | A kind of method of fine coal pressurized delivery of carrier gas |
| CN211771101U (en) * | 2020-02-28 | 2020-10-27 | 陕煤集团榆林化学有限责任公司 | Pulverized coal gasification inert gas optimizing system |
-
2022
- 2022-01-27 CN CN202210098049.XA patent/CN114479946A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1506699A (en) * | 1976-02-26 | 1978-04-12 | Metallgesellschaft Ag | Process for charging a pressure reactor for gasifying coa |
| DE102007020294A1 (en) * | 2007-04-30 | 2008-11-13 | Siemens Ag | Co-use of carbon dioxide and nitrogen in a component of a dust injection system for pulverized coal gasification |
| CN103113925A (en) * | 2013-02-20 | 2013-05-22 | 上海锅炉厂有限公司 | Powdered coal pressure dense-phase conveying device and method of dry coal dust pressure gasification |
| CN203624577U (en) * | 2013-11-15 | 2014-06-04 | 陕西延长石油（集团）有限责任公司碳氢高效利用技术研究中心 | Pneumatic conveying device of coal dust |
| CN109456799A (en) * | 2018-11-19 | 2019-03-12 | 黔西县黔希煤化工投资有限责任公司 | A kind of method of fine coal pressurized delivery of carrier gas |
| CN211771101U (en) * | 2020-02-28 | 2020-10-27 | 陕煤集团榆林化学有限责任公司 | Pulverized coal gasification inert gas optimizing system |
Non-Patent Citations (1)
| Title |
|---|
| 谢克昌等主编: "《化石能源的清洁高效可持续开发利用：第二届"中国工程院/国家能源局能源论坛"论文集》", 煤炭工业出版社 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US20050042166A1 (en) | Method for the production of hydrogen-containing gaseous mixtures | |
| CN101440310B (en) | Process for fluidized bed classification gasification of dust coal | |
| CN103635449A (en) | Systems for converting fuel | |
| US20060042162A1 (en) | System for hydrogen storage and generation | |
| EP2380949A1 (en) | High-temperature gasification process using biomass to produce synthetic gas and system therefor | |
| US8932375B2 (en) | Method for supplying an entrained-flow gasification reactor with carbonaceous fuels | |
| CN100526436C (en) | Safety sealing and air flow conveying method for fine coal gasification process | |
| CN112624041A (en) | Method for producing hydrogen by using waste biomass carbon | |
| WO2014145171A2 (en) | Processes and systems for storing, distributing and dispatching energy on demand using and recycling carbon | |
| CN113338934B (en) | Deep coal fluidization exploitation in-situ gasification device | |
| JP2633678B2 (en) | Method for transporting fine or dusty fuel into a gasification reactor under elevated pressure | |
| CN114479946A (en) | Pulverized coal conveying method, pulverized coal conveying unit and application | |
| EP2374862A1 (en) | High temperature gasifying process with biomass and system thereof | |
| US8025705B2 (en) | Simultaneous gasification of coals of widely differing degrees of coalification in entrained flow gasification | |
| CN103992821B (en) | Coal gasification method | |
| US20110076116A1 (en) | Solid fuel conveyance and injection system for a gasifier | |
| CN109486534B (en) | Coal gas dust removal and desulfurization method | |
| CN102965157B (en) | Powered coal combined type circulating fluidized bed step pyrolysis gasification technology | |
| CN112592264A (en) | System and method for producing succinic acid and PBS (Poly Butylene succinate) by using coal and by-product gas | |
| EP0109109B1 (en) | Process for the partial combustion of solid fuel with fly ash recycle | |
| CN114606026B (en) | Method for simultaneously desulfurizing and dechlorinating blast furnace gas | |
| CN108640090B (en) | Carbothermic reduction of SO 2 Device and method for preparing sulfur | |
| CN108059977B (en) | Near zero emission and CO (carbon monoxide)2Resource utilization fossil energy utilization method | |
| US4578110A (en) | Method of reducing iron oxides | |
| CN111703900A (en) | Pneumatic conveying method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20220513 |
|
| RJ01 | Rejection of invention patent application after publication |