CN107828445B - Feeding method and system for slurry-powder coupling gasification - Google Patents

Feeding method and system for slurry-powder coupling gasification Download PDF

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CN107828445B
CN107828445B CN201711002198.7A CN201711002198A CN107828445B CN 107828445 B CN107828445 B CN 107828445B CN 201711002198 A CN201711002198 A CN 201711002198A CN 107828445 B CN107828445 B CN 107828445B
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coal
raw material
feeding
oxygen
oxidant
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CN107828445A (en
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付伟贤
刘刚
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ENN Science and Technology Development Co Ltd
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ENN Science and Technology Development Co Ltd
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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
    • 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
    • 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
    • C10J2300/0913—Carbonaceous raw material
    • C10J2300/093—Coal
    • C10J2300/0933—Coal fines for producing water gas
    • 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
    • C10J2300/0959—Oxygen
    • 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
    • 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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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Organic Chemistry (AREA)
  • Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)
  • Fluidized-Bed Combustion And Resonant Combustion (AREA)

Abstract

The invention relates to the technical field of coal gasification, in particular to a feeding method and a feeding system for slurry-powder coupling gasification. The safe and stable feeding of the coal water slurry and the pulverized coal can be realized. The embodiment of the invention provides a feeding method for slurry-powder coupling gasification, which comprises the following steps: feeding the first raw material according to the first oxygen coal ratio; in the process of feeding the first raw material, the furnace feeding flow of the first raw material and the oxidant is detected, the furnace feeding flow of the first raw material and/or the oxidant is adjusted according to the gas-first oxy-coal ratio, so that the first raw material and the oxidant are fed at the furnace feeding flow meeting the first oxy-coal ratio, and when the first raw material and the oxidant are fed at the furnace feeding flow meeting the first oxy-coal ratio, the second raw material is fed. The embodiment of the invention is used for preparing methane by slurry-powder coupling gasification.

Description

Feeding method and system for slurry-powder coupling gasification
Technical Field
The invention relates to the technical field of coal gasification, in particular to a feeding method and a feeding system for slurry-powder coupling gasification.
Background
Coal gasification refers to a series of chemical reactions between organic matters in coal and a gasifying agent (such as oxygen) under a certain temperature and pressure to convert solid coal into coal containing CO and H2、CH4Isocombustible gas and CO2、N2In the process of non-combustible gas, the conventional coal gasification technologies mainly comprise a coal water slurry gasification technology, a pulverized coal gasification technology and a multi-component slurry gasification technology, wherein the feeding methods for the gasification of different phase raw materials are different.
Patent document CN101760244A discloses a three-phase multi-raw material pressurized coal gasification device and a process thereof. The pulverized coal, the coal water slurry and the oxidant are introduced into the combustion chamber to carry out gasification reaction at high temperature and high pressure to generate synthesis gas (industrial coal gas) mainly containing carbon monoxide and hydrogen, but the feeding process of the pulverized coal, the coal water slurry and the oxidant is not described in detail, the feeding process plays a crucial role in the whole gasification process, and if the feeding process is unstable, stable three-phase coupling gasification is difficult to realize, and even the gasification furnace fails to start.
Disclosure of Invention
The invention mainly aims to provide a feeding method and a feeding system for slurry-powder coupling gasification, which can realize safe and stable feeding of coal water slurry and pulverized coal.
In order to achieve the purpose, the invention adopts the following technical scheme:
on one hand, the embodiment of the invention provides a feeding method for slurry-powder coupling gasification, which comprises the following steps:
feeding a first raw material according to a first oxygen coal ratio, wherein the first raw material is one of coal water slurry and pulverized coal;
in the process of feeding the first raw material, detecting the feeding flow rates of the first raw material and an oxidant, adjusting the feeding flow rates of the first raw material and/or the oxidant according to the first oxy-coal ratio to feed the first raw material and the oxidant at the feeding flow rate meeting the first oxy-coal ratio, and feeding a second raw material when the first raw material and the oxidant are fed at the feeding flow rate meeting the first oxy-coal ratio, wherein the second raw material is the other one of coal water slurry and pulverized coal.
Optionally, the feeding the first raw material according to the first oxy-coal ratio specifically includes:
establishing an initial flow rate of the first raw material, determining a first initial flow rate of an oxidant according to the initial flow rate of the first raw material and the first oxygen-coal ratio, and simultaneously conveying the oxidant into the gasification furnace at the first initial flow rate and the first raw material at the corresponding initial flow rate.
Optionally, when the first raw material and the oxidant are fed at a furnace inlet flow rate that satisfies the first oxygen-coal ratio, feeding a second raw material specifically includes:
establishing an initial flow rate of the second raw material, determining a second initial flow rate of an oxidant according to a second oxygen-coal ratio, the initial flow rate of the second raw material and the furnace inlet flow rate of the first raw material, conveying the second raw material into the gasification furnace at the corresponding initial flow rate, and meanwhile, regulating the second initial flow rate of the oxidant to convey into the gasification furnace.
Optionally, the feeding method further comprises: and detecting the furnace inlet flow rates of the second raw material and the oxidant, and adjusting the furnace inlet flow rates of the second raw material and/or the oxidant according to the second oxygen coal ratio, so that the second raw material, the first raw material and the oxidant are fed at the furnace inlet flow rates meeting the second oxygen coal ratio.
Optionally, when the first raw material is coal-water slurry, the first oxygen-coal ratio is 0.55-0.70Nm3/kg, the second oxygen coal ratio is 0.45-0.55Nm3/kg；
When the first raw material is pulverized coal, the first oxygen-coal ratio is 0.50-0.65Nm3/kg, the second oxygen coal ratio is 0.45-0.55Nm3/kg。
Optionally, the feeding method further comprises:
when the first raw material and the oxidant are fed at a charging flow rate satisfying the first oxygen-coal ratio, before feeding a second raw material, the flow rates of the oxidant and the first raw material are increased in equal proportion, and the pressure in the gasification furnace is raised to a set value;
or after the furnace inlet flow of the second raw material and/or the oxidant is adjusted according to the second oxygen coal ratio, so that the second raw material, the first raw material and the oxidant meet the furnace inlet flow of the second oxygen coal ratio for feeding, the flow of the oxidant, the coal water slurry and the pulverized coal are increased in equal proportion, and the pressure in the combustion chamber is increased to a set value.
Optionally, when the initial flow rate of the first raw material is established, the feeding method further includes: adjusting the conveying pressure of the first raw material, so that the difference between the conveying pressure of the first raw material and the pressure in the gasification furnace is greater than or equal to a first preset value;
in establishing the initial flow of the second feedstock, the method of feeding further comprises: and adjusting the conveying pressure of the second raw material, so that the difference between the conveying pressure of the second raw material and the pressure in the gasification furnace is greater than or equal to a second preset value.
Optionally, when the first raw material is coal water slurry, the first preset value is 1.0MPa, and the second preset value is 0.8 MPa;
when the first raw material is pulverized coal, the first preset value is 0.8MPa, and the second preset value is 0.6 MPa.
Optionally, before the oxidant and the first raw material are conveyed into the gasifier at the first initial flow rate and the corresponding initial flow rate, the feeding method further includes:
establishing a first initial flow of the oxidant and adjusting a delivery pressure of the oxidant such that a difference between the delivery pressure of the oxidant and a pressure within the combustion chamber is greater than or equal to 1.0 MPa.
Optionally, on the basis of dry coal, the mass ratio of the total feeding amount of the pulverized coal to the total feeding amount of the coal-water slurry is 1:2-1: 10.
Optionally, the initial flow of the coal water slurry is 30% -90% of the total feeding amount of the coal water slurry; the initial flow of the pulverized coal is 30-100% of the total feeding amount of the pulverized coal.
On the other hand, the embodiment of the invention provides a feeding system for slurry-powder coupling gasification, which comprises:
the system comprises a coal water slurry feeding groove and a coal water slurry feeding pump communicated with the coal water slurry feeding groove, wherein the output end of the coal water slurry feeding pump is communicated with a gasification furnace, and a coal water slurry flow transmitter is arranged on a pipeline for communicating the output end of the coal water slurry feeding pump with the gasification furnace;
the system comprises a pulverized coal low-pressure storage tank, a pulverized coal lock hopper, a pulverized coal high-pressure storage tank and a pulverized coal feeder which are sequentially communicated, wherein an outlet of the pulverized coal feeder is communicated with a gasification furnace, and a pulverized coal flow transmitter is arranged on a pipeline for communicating the outlet of the pulverized coal feeder with the gasification furnace;
an outlet of the oxygen source is communicated with the gasification furnace, an oxygen flow regulating valve is arranged at the outlet of the oxygen source, and an oxygen flow transmitter is arranged on a pipeline for communicating the outlet of the oxygen source with the gasification furnace;
the oxygen-coal ratio controller is respectively and electrically connected with the coal water slurry flow transmitter, the pulverized coal flow transmitter and the oxygen flow transmitter; and is electrically connected with at least one of the coal water slurry feeding pump, the pulverized coal feeder and the oxygen flow regulating valve.
Optionally, the coal water slurry feeding pump and the coal water slurry feeding trough are circularly communicated through a first circulating pipeline, and the first circulating pipeline is communicated with the gasification furnace through a first pipeline, wherein the coal water slurry flow transmitter is arranged on the first circulating pipeline between the output end of the coal water slurry feeding pump and the inlet of the first pipeline, a coal water slurry feeding valve is arranged on the first pipeline, and a coal water slurry circulating control valve is further arranged on the first circulating pipeline between the inlet of the first pipeline and the coal water slurry feeding trough.
Optionally, the fine coal low pressure storage tank, fine coal lock fill, fine coal high pressure storage tank and fine coal charging means pass through second circulation pipeline circulation intercommunication, and will second circulation pipeline with the gasifier passes through second pipeline intercommunication, wherein, fine coal flow transmitter sets up the export of fine coal charging means with on the second circulation pipeline between the entry of second pipeline, be provided with the fine coal feed valve on the second pipeline, the entry of second pipeline with still be provided with fine coal circulation control valve on the second circulation pipeline between the fine coal charging means.
Optionally, the outlet of the oxygen gas source is communicated with the outside through an emptying pipeline, and the emptying pipeline is communicated with the gasification furnace through a third pipeline, wherein the oxygen flow transmitter is arranged on the emptying pipeline between the outlet of the oxygen gas source and the inlet of the third pipeline, the tail end of the emptying pipeline is further provided with an oxygen emptying control valve, and the emptying pipeline is further provided with an oxygen feeding valve.
The embodiment of the invention provides a feeding method and a feeding system for slurry-powder coupling gasification, wherein the coal water slurry and the pulverized coal are sequentially fed, namely after the feeding of one raw material is stable, the other raw material is fed, so that after the feeding of one raw material is stable, a gasification furnace can reach the process parameters of temperature, pressure and the like required by the design, a subsequent system for gas washing, conversion and the like can normally operate to realize the stable start of the gasification furnace, and then the feeding of the other raw material is carried out under the condition that the gasification furnace operates stably, the working condition change amplitude of the gasification furnace is small, the adjustment is simple, so that the safe and stable feeding of the coal water slurry and the pulverized coal can be realized, and the stable slurry-powder coupling gasification can be further realized.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without inventive efforts.
Fig. 1 is a schematic flow chart of a feeding method for slurry-powder coupled gasification according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a feeding system for slurry-powder coupling gasification according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of another feeding system for slurry-powder coupled gasification according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In one aspect, an embodiment of the present invention provides a feeding method for slurry-powder coupling gasification, referring to fig. 1, including:
step 1) feeding a first raw material according to a first oxygen coal ratio, wherein the first raw material is one of coal water slurry and pulverized coal;
and 2) in the process of feeding the first raw material, detecting the feeding flow rates of the first raw material and an oxidant, adjusting the feeding flow rates of the first raw material and/or the oxidant according to the first oxy-coal ratio to feed the first raw material and the oxidant at the feeding flow rate meeting the first oxy-coal ratio, and feeding a second raw material when the first raw material and the oxidant are fed at the feeding flow rate meeting the first oxy-coal ratio, wherein the second raw material is the other one of coal water slurry and pulverized coal.
It should be noted that, when a raw material is fed, in the actual feeding process, when the raw material and an oxidant are fed into a gasifier at a certain flow rate, both the flow rate error in the feeding process and the actual reaction condition of the raw material and the oxidant caused by the flow rate error affect the changes of the process parameters such as temperature and pressure in the gasifier, so that in the feeding process, the reaction error caused by the flow rate error can be reduced by readjusting the feeding flow rate of the raw material and/or the oxidant according to the oxygen coal ratio, thereby reducing the influence on the process parameters such as temperature and pressure in the gasifier and enabling the raw material to be fed safely and stably.
The embodiment of the invention provides a feeding method for slurry-powder coupling gasification, which comprises the steps of sequentially feeding coal water slurry and pulverized coal, namely feeding another raw material after the feeding of one raw material is stable, so that after the feeding of one raw material is stable, a gasification furnace can reach the process parameters of temperature, pressure and the like required by design, a subsequent system such as gas washing, conversion and the like can normally operate to realize the stable start-up of the gasification furnace, then feeding the other raw material under the condition that the gasification furnace operates stably, the working condition change range of the gasification furnace is small, the adjustment is simple, the safe and stable feeding of the coal water slurry and the pulverized coal can be realized, and the stable slurry-powder coupling gasification can be realized.
In an embodiment of the present invention, the feeding the first raw material according to the first coal oxide ratio specifically includes:
establishing an initial flow rate of the first raw material, determining a first initial flow rate of an oxidant according to the initial flow rate of the first raw material and the first oxygen-coal ratio, and simultaneously conveying the oxidant into the gasification furnace at the first initial flow rate and the corresponding initial flow rate of the first raw material.
In the embodiment of the present invention, the initial flow rate of the first raw material is established in advance, the first initial flow rate of the oxidizing agent is determined according to the initial flow rate of the first raw material, and the determined oxidizing agent is simultaneously delivered into the gasification furnace at the first initial flow rate and the corresponding initial flow rate of the first raw material, so that the adjustment time of the flow rates of the first raw material and the oxidizing agent in the feeding process can be reduced, the temperature fluctuation and the pressure fluctuation caused by the adjustment of the flow rates in the feeding process are avoided, and the feeding stability and the safety of the first raw material are further improved.
In another embodiment of the present invention, when the first raw material and the oxidant are fed at a furnace inlet flow rate satisfying the first oxygen-coal ratio, the feeding of the second raw material specifically includes:
establishing an initial flow rate of the second raw material, determining a second initial flow rate of an oxidant according to a second oxygen-coal ratio, the initial flow rate of the second raw material and the furnace inlet flow rate of the first raw material, conveying the second raw material into the gasification furnace at the corresponding initial flow rate, and simultaneously regulating the second initial flow rate of the oxidant and conveying the oxidant into the gasification furnace.
In the embodiment of the invention, the initial flow rate of the second raw material is established in advance, and the second initial flow rate of the oxidant is determined according to the second oxygen-coal ratio determination, the initial flow rate of the second raw material and the furnace inlet flow rate of the first raw material, so that the adjusting time of the flow rates of the first raw material and the oxidant in the feeding process can be reduced, the temperature fluctuation and the pressure fluctuation caused by the adjustment of the flow rates in the feeding process are avoided, and the feeding stability and the feeding safety of the first raw material are further improved.
In another embodiment of the present invention, the feeding method further comprises: and detecting the furnace inlet flow rates of the second raw material and the oxidant, and adjusting the furnace inlet flow rates of the second raw material and/or the oxidant according to the second oxygen coal ratio, so that the second raw material, the first raw material and the oxidant are fed at the furnace inlet flow rates meeting the second oxygen coal ratio.
In the embodiment of the invention, the flow error can be further reduced by adjusting the furnace inlet flow of the second raw material and/or the oxidant, so that the temperature and pressure fluctuation caused by the flow error can be reduced, and the feeding stability can be further improved.
When the first raw material is coal water slurry, the second raw material is pulverized coal, at this time, the initial flow of the first raw material is established, the first raw material can be conveyed through a conveying pump, the initial flow of the second raw material is established, and the second raw material can be conveyed in a mode that conveying gas carries the second raw material. And on the contrary, the first raw material is conveyed in a mode that the conveying gas carries the first raw material, and the second raw material is conveyed by the conveying pump.
In another preferred embodiment of the present invention, when establishing the initial flow rate of the first raw material, the feeding method further comprises: adjusting the conveying pressure of the first raw material, so that the difference between the conveying pressure of the first raw material and the pressure in the gasification furnace is greater than or equal to a first preset value;
in establishing the initial flow of the second feedstock, the method of feeding further comprises: and adjusting the conveying pressure of the second raw material, so that the difference between the conveying pressure of the second raw material and the pressure in the gasification furnace is greater than or equal to a second preset value.
In the embodiment of the present invention, the conveying pressure of the first raw material and the second raw material is adjusted in advance before the first raw material and the second raw material are charged, so that smooth charging of the first raw material and the second raw material can be realized.
Preferably, when the first raw material is coal water slurry, the first preset value is 1.0MPa, and the second preset value is 0.8 MPa;
when the first raw material is pulverized coal, the first preset value is 0.8MPa, and the second preset value is 0.6 MPa.
In a preferred embodiment of the present invention, before the first initial flow rate of the oxidant and the corresponding initial flow rate of the first raw material are delivered into the gasifier, the feeding method further includes:
establishing a first initial flow of the oxidant and adjusting a delivery pressure of the oxidant such that a difference between the delivery pressure of the oxidant and a pressure within the combustion chamber is greater than or equal to 1.0 MPa.
By establishing the first initial flow of the oxidant in advance, when the oxidant is conveyed into the gasification furnace at the first initial flow, the temperature and pressure fluctuation caused by a large-amplitude adjusting process can be avoided, and the safety and the stability of initial feeding are further improved.
In a preferred embodiment of the invention, the initial flow rate of the coal water slurry is 30-90% of the total feeding amount of the coal water slurry; the initial flow of the pulverized coal is 30-100% of the total feeding amount of the pulverized coal.
Through the injecing to the initial flow of coal slurry and fine coal, can avoid the gasifier internal pressure, the rising speed of temperature too fast, can guarantee gasifier safety for system adjustment reservation time, otherwise temperature, pressure rise too fast in the stove, the operation is improper, direct influence is able to bear or endure firebrick life-span, and the material of heating too fast equipment, pipeline will be influential, and harm is very big.
The total feeding amount of the coal water slurry and the total feeding amount of the pulverized coal can be determined according to process conditions.
Experiments show that preferably, when dry coal is taken as a reference, and the mass ratio of the total feeding amount of the pulverized coal to the total feeding amount of the coal water slurry is 1:2-1:10, the resource optimization configuration can be realized, and the efficiency of preparing methane by coal gasification is improved.
In a preferred embodiment of the present invention, when the first raw material is coal-water slurry, the first oxygen-coal ratio is 0.55-0.70Nm3/kg, the second oxygen coal ratio is 0.45-0.55Nm3/kg；
When the first raw material is pulverized coal, the first oxygen-coal ratio is 0.50-0.65Nm3/kg, the second oxygen coal ratio is 0.45-0.55Nm3/kg。
The ranges of the first oxygen coal ratio and the second oxygen coal ratio are limited according to the coal water slurry and the pulverized coal respectively, so that the stability and the safety of feeding of the first raw material and the second raw material can be improved.
In the initial charging stage, firstly, the gasification furnace is dried to make the gasification furnace have an ignition temperature, then the first raw material is charged, and when the charging of the first raw material is stable, namely the first raw material and the oxidant are charged at the charging flow rate meeting the first oxygen-coal ratio, the flow rates of the oxidant and the first raw material are increased in equal proportion before the charging of the second raw material, so that the pressure in the gasification furnace is increased to a set value; or after the feeding of the second raw material is stable, namely the charging flow of the second raw material and/or the oxidant is adjusted according to the second oxygen-coal ratio, so that the second raw material, the first raw material and the oxidant are fed at the charging flow meeting the second oxygen-coal ratio, the flow of the oxidant, the coal water slurry and the pulverized coal are increased in equal proportion, and the pressure in the gasification furnace is increased to a set value. The two schemes can stabilize the pressure in the gasification furnace at a certain value, and meet the requirement of coal gasification reaction.
Preferably, the pressure in the gasification furnace is increased to a set value at a rate of 0.05 to 0.2 MPa/min.
In another aspect, an embodiment of the present invention provides a feeding system for slurry-powder coupled gasification, referring to fig. 2, including:
the system comprises a coal water slurry feeding groove 1 and a coal water slurry feeding pump 2 communicated with the coal water slurry feeding groove 1, wherein the output end of the coal water slurry feeding pump 2 is communicated with a gasification furnace 3, and a coal water slurry flow transmitter 4 is arranged on a pipeline for communicating the output end of the coal water slurry feeding pump 2 with the gasification furnace 3;
the system comprises a pulverized coal low-pressure storage tank 5, a pulverized coal lock hopper 6, a pulverized coal high-pressure storage tank 7 and a pulverized coal feeder 8 which are sequentially communicated, wherein an outlet of the pulverized coal feeder 8 is communicated with a gasification furnace 3, and a pulverized coal flow transmitter 9 is arranged on a pipeline for communicating an outlet of the pulverized coal feeder 8 with the gasification furnace 3;
an outlet of the oxygen gas source 10 is communicated with the gasification furnace 3, an oxygen flow regulating valve a is arranged at an outlet of the oxygen gas source 10, and an oxygen flow transmitter 11 is arranged on a pipeline for communicating the outlet of the oxygen gas source 10 with the gasification furnace 3;
the oxygen-coal ratio controller 12, the oxygen-coal ratio controller 12 is respectively and electrically connected with the coal water slurry flow transmitter 4, the pulverized coal flow transmitter 9 and the oxygen flow transmitter 11; and is electrically connected to at least one of the coal water slurry feed pump 2, the pulverized coal feeder 8, and the oxygen flow regulating valve a (as shown in fig. 2, only the oxygen/coal ratio controller 12 is shown electrically connected to the oxygen flow regulating valve a).
The embodiment of the invention provides a feeding system for slurry-powder coupling gasification, which is characterized in that a coal water slurry conveying system, a pulverized coal conveying system and an oxygen conveying system are respectively arranged, the coal water slurry conveying system, the pulverized coal conveying system and the oxygen conveying system are respectively communicated with a gasification furnace 3, feeding of coal water slurry, pulverized coal and oxygen can be respectively carried out in the gasification furnace 3, an oxygen-coal ratio controller 12 is arranged, a coal water slurry flow transmitter 4 is arranged on a pipeline for communicating the output end of a coal water slurry feeding pump 2 with the gasification furnace 3, a pulverized coal flow transmitter 9 is arranged on a pipeline for communicating the outlet of a pulverized coal feeder 8 with the gasification furnace 3, and an oxygen flow transmitter 11 is arranged on a pipeline for communicating the outlet of an oxygen gas source 10 with the gasification furnace 3, so that the feeding flow of the coal water slurry, the pulverized coal and the oxygen can be detected in the feeding process, and at least one flow is controlled, the coal water slurry and the pulverized coal can be sequentially fed, and after one raw material is fed stably and reaches the technological parameters of temperature, pressure and the like required by design, the other raw material is fed, so that the working condition change range of the gasification furnace is small, the adjustment is simple, the safe and stable feeding of the coal water slurry and the pulverized coal can be realized, and the stable slurry-powder coupling gasification can be realized.
In the feeding process, the rotating speed of the coal water slurry feeding pump 2 is adjusted, the flow of the coal water slurry can be adjusted, in the pulverized coal conveying process, carbon dioxide is usually used as conveying gas to carry out pneumatic conveying in pipelines of a pulverized coal low-pressure storage tank 5, a pulverized coal locking hopper 6, a pulverized coal high-pressure storage tank 7 and a pulverized coal feeder 8 which are communicated in sequence, so that the conveying of pulverized coal is realized, and the flow of oxygen is adjusted by controlling the opening degree of an oxygen flow adjusting valve a, so that preferably, an oxygen-coal ratio controller 12 adjusts the furnace inlet flow of oxygen by controlling the opening degree of the oxygen flow adjusting valve a, so that the first raw material and the oxidant are fed at the furnace inlet flow meeting the first oxygen-coal ratio. And when the second raw material is fed, feeding the first raw material, the second raw material and the oxidant at a furnace inlet flow rate meeting the second oxygen-coal ratio. Therefore, the oxygen-coal ratio can be accurately controlled.
In an embodiment of the present invention, referring to fig. 3, the coal-water slurry feeding pump 2 and the coal-water slurry feeding tank 1 are circularly communicated through a first circulation line L1, and the first circulation line L1 is communicated with the gasification furnace 3 through a first line L1, wherein the coal-water slurry flow transmitter 4 is disposed on the first circulation line L1 between the output end of the coal-water slurry feeding pump 3 and the inlet of the first line L1, the first line L1 is provided with a coal-water slurry feeding valve b, and the first circulation line L1 between the inlet of the first line L1 and the coal-water slurry feeding tank 1 is further provided with a coal-water slurry circulation control valve c.
With this structure, before the coal-water slurry is fed, the initial flow rate of the coal-water slurry can be established in the first circulation line L1 in advance, namely, the coal water slurry feeding valve b is closed, the coal water slurry circulating control valve c is opened, and according to the flow signal sent by the coal water slurry flow transmitter 4, the rotating speed of the water-coal-slurry feeding pump 2 is adjusted to adjust the initial flow of the water-coal-slurry, when the coal water slurry needs to be fed into the gasification furnace 3, the coal water slurry circulation control valve c can be cut off, and the coal water slurry feeding valve b is opened, so that the coal water slurry with the adjusted initial flow can be directly fed at the initial flow, the adjusting time of the flow of the coal water slurry in the feeding process can be shortened, the temperature and pressure fluctuation caused by flow adjustment in the feeding process can be avoided, and the feeding stability and safety of the coal water slurry are further improved.
In order to adjust the pressure of the coal-water slurry in advance, it is preferable that a coal-water slurry pressure adjusting valve d is further provided on the first circulation line L1.
In another embodiment of the present invention, the pulverized coal low-pressure storage tank 5, the pulverized coal locking hopper 6, the pulverized coal high-pressure storage tank 7 and the pulverized coal feeder 8 are circularly communicated through a second circulation pipeline L2, and the second circulation pipeline L2 is communicated with the gasification furnace 3 through a second pipeline L2, wherein the pulverized coal flow transmitter 9 is disposed on the second circulation pipeline L2 between the outlet of the pulverized coal feeder 8 and the inlet of the second pipeline L1, the second pipeline L2 is provided with a pulverized coal feeding valve e, and the second circulation pipeline L2 between the inlet of the second pipeline L2 and the pulverized coal feeder 8 is further provided with a pulverized coal circulation control valve f.
With this structure, before the pulverized coal is charged, the initial flow rate of the pulverized coal can be established in the second circulation line L2 in advance, namely, the pulverized coal feeding valve e is closed, the pulverized coal circulation control valve f is opened, and according to the flow signal sent by the pulverized coal flow transmitter 9, the flow rate of the conveying gas of the pulverized coal feeder 8 is adjusted to adjust the initial flow rate of the pulverized coal, the needs will the fine coal throw the material extremely in the gasifier 3, can cut off fine coal circulation control valve f opens fine coal feed valve e, just can be directly throw the material with initial flow with the fine coal of adjusting the flow, can reduce throw the material in-process right the adjust time of the flow of fine coal avoids throwing the temperature, the pressure fluctuation that bring is adjusted to flow in-process, further improves the stability and the security of throwing of fine coal.
In order to adjust the pressure of the pulverized coal in advance, it is preferable that a pulverized coal pressure adjusting valve g is further provided in the first circulation line L1.
In another embodiment of the present invention, the outlet of the oxygen gas source 10 is communicated with the outside through a vent pipe L3, and the vent pipe L3 is communicated with the gasification furnace 3 through a third pipeline L3, wherein the oxygen flow transmitter 11 is disposed on the vent pipe L3 between the outlet of the oxygen gas source 10 and the inlet of the third pipeline L3, the end of the vent pipe L3 is further provided with an oxygen vent control valve h, and the third pipeline L3 is further provided with an oxygen feed valve j.
With this structure, before the oxygen is fed, the initial flow rate of oxygen can be established in advance through the vent line L3, namely, the oxygen feeding valve j is closed, the oxygen emptying control valve h is opened, and according to the flow signal sent by the oxygen flow transmitter 11, the opening degree of the oxygen flow regulating valve a is regulated to regulate the initial flow of the oxygen, when the oxygen needs to be fed into the gasification furnace 3, the oxygen emptying control valve h can be cut off, the oxygen feeding valve j is opened, the oxygen with the adjusted flow can be directly fed at the initial flow, the adjustment time of the flow of the oxygen in the feeding process can be shortened, the temperature and pressure fluctuation caused by the adjustment of the flow in the feeding process is avoided, and the feeding stability and the feeding safety of the oxygen are further improved.
In order to adjust the pressure of the oxygen in advance, it is preferable that an oxygen pressure adjusting valve L is further provided in the purge line L3.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

Claims (11)

1. A feeding method for slurry-powder coupling gasification is characterized by comprising the following steps:
feeding a first raw material according to a first oxygen coal ratio, wherein the first raw material is one of coal water slurry and pulverized coal;
in the process of feeding the first raw material, detecting the feeding flow rates of the first raw material and an oxidant, adjusting the feeding flow rates of the first raw material and/or the oxidant according to the first oxy-coal ratio to feed the first raw material and the oxidant at the feeding flow rate meeting the first oxy-coal ratio, and feeding a second raw material which is the other one of coal water slurry and pulverized coal when the first raw material and the oxidant are fed at the feeding flow rate meeting the first oxy-coal ratio;
the feeding of the first raw material according to the first oxygen coal ratio specifically comprises:
establishing an initial flow rate of the first raw material, determining a first initial flow rate of an oxidant according to the initial flow rate of the first raw material and the first oxygen-coal ratio, and simultaneously conveying the oxidant into a gasification furnace at the first initial flow rate and the first raw material at corresponding initial flow rates;
when the first raw material and the oxidant are fed at a furnace inlet flow rate which meets the first oxygen-coal ratio, feeding a second raw material, specifically comprising:
establishing an initial flow rate of the second raw material, determining a second initial flow rate of an oxidant according to a second oxygen-coal ratio, the initial flow rate of the second raw material and the furnace inlet flow rate of the first raw material, conveying the second raw material into the gasification furnace at the corresponding initial flow rate, and meanwhile, regulating the second initial flow rate of the oxidant to convey into the gasification furnace.
2. The charging method according to claim 1,
the feeding method further comprises the following steps: and detecting the furnace inlet flow rates of the second raw material and the oxidant, and adjusting the furnace inlet flow rates of the second raw material and/or the oxidant according to the second oxygen coal ratio, so that the second raw material, the first raw material and the oxidant are fed at the furnace inlet flow rates meeting the second oxygen coal ratio.
3. The charging method according to claim 1, wherein when the first raw material is coal-water slurry, the first oxygen-to-coal ratio is 0.55-0.70Nm3/kg, the second oxygen coal ratio is 0.45-0.55Nm3/kg；
When the first raw material is pulverized coal, the first oxygen-coal ratio is 0.50-0.65Nm3/kg, the second oxygen coal ratio is 0.45-0.55Nm3/kg。
4. The charging method according to claim 2,
the feeding method further comprises the following steps:
when the first raw material and the oxidant are fed at a furnace inlet flow rate which meets a first oxygen-coal ratio, before the second raw material is fed, the flow rates of the oxidant and the first raw material are proportionally increased, and the pressure in the gasification furnace is increased to a set value;
or after the furnace inlet flow of the second raw material and/or the oxidant is adjusted according to the second oxygen coal ratio, so that the second raw material, the first raw material and the oxidant are fed according to the furnace inlet flow meeting the second oxygen coal ratio, the flow of the oxidant, the coal water slurry and the pulverized coal is increased in equal proportion, and the pressure in the combustion chamber is increased to a set value.
5. The charging method according to claim 1, wherein in establishing the initial flow rate of the first feedstock, the charging method further comprises: adjusting the conveying pressure of the first raw material, so that the difference between the conveying pressure of the first raw material and the pressure in the gasification furnace is greater than or equal to a first preset value;
in establishing the initial flow of the second feedstock, the method of feeding further comprises: and adjusting the conveying pressure of the second raw material, so that the difference between the conveying pressure of the second raw material and the pressure in the gasification furnace is greater than or equal to a second preset value.
6. The charging method according to claim 5,
when the first raw material is coal water slurry, the first preset value is 1.0MPa, and the second preset value is 0.8 MPa;
when the first raw material is pulverized coal, the first preset value is 0.8MPa, and the second preset value is 0.6 MPa.
7. The charging method according to claim 1,
before the oxidant and the first raw material are conveyed into the gasifier at the first initial flow rate and the corresponding initial flow rate, the feeding method further comprises the following steps:
establishing a first initial flow of the oxidant and adjusting a delivery pressure of the oxidant such that a difference between the delivery pressure of the oxidant and a pressure within the combustion chamber is greater than or equal to 1.0 MPa.
8. The charging method according to claim 1,
taking dry coal as a reference, and the mass ratio of the total feeding amount of the pulverized coal to the total feeding amount of the coal water slurry is 1:2-1: 10.
9. The charging method according to claim 1,
the initial flow of the coal water slurry is 30-90% of the total feeding amount of the coal water slurry;
the initial flow of the pulverized coal is 30-100% of the total feeding amount of the pulverized coal.
10. A feeding system for slurry-powder coupling gasification is characterized by comprising:
the system comprises a coal water slurry feeding groove and a coal water slurry feeding pump communicated with the coal water slurry feeding groove, wherein the output end of the coal water slurry feeding pump is communicated with a gasification furnace, and a coal water slurry flow transmitter is arranged on a pipeline for communicating the output end of the coal water slurry feeding pump with the gasification furnace;
the system comprises a pulverized coal low-pressure storage tank, a pulverized coal lock hopper, a pulverized coal high-pressure storage tank and a pulverized coal feeder which are sequentially communicated, wherein an outlet of the pulverized coal feeder is communicated with a gasification furnace, and a pulverized coal flow transmitter is arranged on a pipeline for communicating the outlet of the pulverized coal feeder with the gasification furnace;
an outlet of the oxygen source is communicated with the gasification furnace, an oxygen flow regulating valve is arranged at the outlet of the oxygen source, and an oxygen flow transmitter is arranged on a pipeline for communicating the outlet of the oxygen source with the gasification furnace;
the oxygen-coal ratio controller is respectively and electrically connected with the coal water slurry flow transmitter, the pulverized coal flow transmitter and the oxygen flow transmitter; and is electrically connected with at least one of the coal water slurry feeding pump, the pulverized coal feeder and the oxygen flow regulating valve;
the coal water slurry feeding pump is communicated with the coal water slurry feeding groove in a circulating mode through a first circulating pipeline, the first circulating pipeline is communicated with the gasification furnace through a first pipeline, the coal water slurry flow transmitter is arranged on the first circulating pipeline between the output end of the coal water slurry feeding pump and the inlet of the first pipeline, a coal water slurry feeding valve is arranged on the first pipeline, and a coal water slurry circulating control valve is further arranged on the first circulating pipeline between the inlet of the first pipeline and the coal water slurry feeding groove;
the fine coal low pressure storage tank, fine coal lock fill, fine coal high pressure storage tank and fine coal charging means pass through second circulation pipeline circulation intercommunication, and will the second circulation pipeline with the gasifier passes through second pipeline intercommunication, wherein, fine coal flow transmitter sets up the export of fine coal charging means with on the second circulation pipeline between the entry of second pipeline, be provided with the fine coal feed valve on the second pipeline, the entry of second pipeline with still be provided with fine coal circulation control valve on the second circulation pipeline between the fine coal charging means.
11. The charging system of claim 10,
the outlet of the oxygen gas source is communicated with the outside through an emptying pipeline, the emptying pipeline is communicated with the gasification furnace through a third pipeline, the oxygen flow transmitter is arranged on the emptying pipeline between the outlet of the oxygen gas source and the inlet of the third pipeline, the tail end of the emptying pipeline is further provided with an oxygen emptying control valve, and the emptying pipeline is further provided with an oxygen feeding valve.
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CN202025238U (en) * 2011-01-07 2011-11-02 水煤浆气化及煤化工国家工程研究中心 Oxygen-coal-ratio automatic control system of powdered coal pressurizing and gasifying device
CN103555370A (en) * 2012-11-23 2014-02-05 新奥气化采煤有限公司 Method for gasifying carbonaceous organic materials and gasification furnace
CN103897739A (en) * 2014-04-15 2014-07-02 新奥气化采煤有限公司 Coal co-gasification method

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101760244A (en) * 2008-12-24 2010-06-30 山东华鲁恒升化工股份有限公司 Three-phase multi-raw-material pressurized coal gasification device and process thereof
CN202025238U (en) * 2011-01-07 2011-11-02 水煤浆气化及煤化工国家工程研究中心 Oxygen-coal-ratio automatic control system of powdered coal pressurizing and gasifying device
CN103555370A (en) * 2012-11-23 2014-02-05 新奥气化采煤有限公司 Method for gasifying carbonaceous organic materials and gasification furnace
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