CN109135837B - Wet gasification method and system for coal water slurry or hydrocarbon slurry - Google Patents
Wet gasification method and system for coal water slurry or hydrocarbon slurry Download PDFInfo
- Publication number
- CN109135837B CN109135837B CN201811115223.7A CN201811115223A CN109135837B CN 109135837 B CN109135837 B CN 109135837B CN 201811115223 A CN201811115223 A CN 201811115223A CN 109135837 B CN109135837 B CN 109135837B
- Authority
- CN
- China
- Prior art keywords
- slurry
- coal
- gasification
- water
- carbon black
- 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.)
- Active
Links
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
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
- C10J3/72—Other features
-
- 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
- C10J2300/0956—Air or oxygen enriched air
-
- 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
- C10J2300/16—Integration of gasification processes with another plant or parts within the plant
- C10J2300/1625—Integration of gasification processes with another plant or parts within the plant with solids treatment
- C10J2300/1628—Ash post-treatment
Abstract
The invention discloses a wet gasification method and a system for coal water slurry or hydrocarbon slurry, wherein the system comprises a separation device for effectively separating combustible particles and non-combustible particles in raw coal slurry and carbon black slurry to obtain clean coal slurry, and a gasification device for gasifying the clean coal slurry to generate synthetic gas and carbon black slurry, and the separation device is communicated with the gasification device through a pipeline. The invention can make all solid fossil energy sources with calorific value be used for the wet-process feeding gasification similar to coal water slurry, expand the raw material sources used for coal water slurry entrained flow bed gasification technology, make the cost of the synthesis gas produced by gasification technology more competitive, meanwhile, the invention can also effectively separate the combustible particles in the carbon black slurry and return to the gasification device for continuous gasification treatment, thereby improving the gasification efficiency of the coal water slurry, and the non-combustible particles can also be used as a precious engineering raw material for the fields of building materials, roads and bridges, backfilling and the like after being recovered.
Description
Technical Field
The invention relates to the field of coal water slurry gasification, in particular to a wet gasification method and a wet gasification system for coal water slurry or hydrocarbon slurry.
Background
Coal will still be the main basic energy of our country for a long time in the future, and the utilization of coal is more difficult and more polluted than natural gas and petroleum. In fact, the coal resources in China are low in utilization rate at present, and pollution which is difficult to ignore is generated to the environment in the process of mining and utilizing. In order to maintain national energy safety and deal with environmental protection, energy conservation, emission reduction, cleanness and high efficiency are necessary requirements for utilization of coal resources. In order to realize the sustainable development of the coal industry, the coal gasification technology is taken as an important means for clean utilization of coal, and great attention is paid to and developed.
In the traditional coal gasification process, according to different raw materials used by a gasification furnace, the traditional coal gasification process is divided into a dry coal gasification process and a coal water slurry coal gasification process, wherein the dry coal powder is directly carried by compressed gas and enters the gasification furnace for gasification, and the coal water slurry coal gasification process is usually formed by mixing coal powder and water into coal water slurry and then enters the gasification furnace for gasification. Because the wet coal gasification process is superior to the dry coal gasification process in the aspects of feeding continuity, stability and cost, the wet coal gasification process has more application prospect in industry, and the coal water slurry gasification is widely applied in practice.
Current commercial wet coal gasifiers have stringent requirements on the raw coal water slurry, such as a requirement that the solids content thereof is as high as possible while ensuring the flow stability of the coal water slurry in order to ensure a high heating value and high gasification efficiency; meanwhile, ash content in the coal water slurry is required to be as low as possible so as to reduce scouring erosion of ash slag carried by high-temperature airflow in the gasification furnace to refractory bricks forming the wall of the gasification furnace, and because oxides of metals such as iron, calcium, magnesium and the like in the ash content can permeate into the refractory bricks and carry out chemical reaction, the interior of the refractory bricks is loosened, the strength is reduced, and the refractory bricks are eroded.
The above strict requirements for coal water slurry lead to that only high-quality coal can be used as a raw material for preparing coal water slurry in the current coal gasification industry, wherein the indexes of the high-quality coal are as follows: the calorific value is higher than 4500 kcal/kg, and the ash content is lower than 20 wt%. The existing water-coal-slurry gasification furnace can not process inferior coal, and the application range of the water-coal-slurry gasification process is limited to a great extent. Meanwhile, the amount of high-quality coal mined tends to be reduced and the cost is high, while a large amount of low-quality coal in a coal mine cannot be effectively utilized except for being used as household fuel. The low-grade coal generally has at least one of the following characteristics: high ash content, low fixed carbon content, high content of ash-free dry base volatile matter, low ash softening temperature, large smoke generated during combustion, easy coking, high coal gangue content, low calorific value (usually lower than 4500 kcal/kg), and the like. For the sake of uniformity, low-grade coal is defined herein as coal containing carbon-hydrogen containing combustibles and at least 20wt% mineral impurities. For example, the low-grade coal can be selected from middlings, coal slime or coal gangue.
Therefore, there is an urgent need in the art for a technology capable of preparing an acceptable coal-water slurry from low-grade coal as a raw material, but the low-grade coal is characterized by high content of mineral impurities (generally higher than 20wt%, for example, 25-45 wt%), low calorific value, and direct pulverization thereof, which cannot be used for preparing an acceptable coal-water slurry to supply to the existing gasification furnace. The inferior coal must be purified to separate the carbon-hydrogen-containing combustible material from the mineral matter sufficiently, so that the inferior coal can be used as the raw material to prepare the high-quality coal water slurry.
In addition, the carbon black (fine slag) filter cake is a coal gasification byproduct, mainly comprises minerals (non-combustibles) such as silicon dioxide and alumina, and a little residual carbon (combustibles), and is obtained by the technical processes of settling, filter pressing and the like of carbon black water of a coal gasification device. The content of residual combustible substances in the carbon black filter cake greatly fluctuates with the change of the type of the gasification furnace, the gasification process, the operation condition of gasification raw materials and the like, the content of the combustible substances is generally 10-30wt.%, and the content of the combustible substances can reach 60wt.% under the bad gasification condition.
At present, the treatment modes of the partial carbon black filter cake are mainly used for building products, brick burning, boiler fuel and landfill, but the four treatment modes have great disadvantages.
If the carbon black is directly used for building materials, construction, roads and backfill engineering, the main limiting factor is the amount of solid combustible materials, and due to the special process operation characteristics of a gasification device system, the carbon residue value of a byproduct carbon black filter cake far exceeds the limit value of national standards and related industrial standards, the utilization value of coal is reduced even when the carbon black filter cake is used as boiler fuel, and meanwhile, the matched environment-friendly investment for boiler flue gas treatment needs to be increased.
With the proposition and implementation of the new environmental protection law of China, the investigation and treatment of pollution enterprises in various places is continuously strengthened, brick factories which do not meet the environmental protection requirement are gradually closed, carbon black filter cakes are sold everywhere and are used as landfill materials and transported to the outside of the factory by using automobiles, secondary pollution can be caused, and meanwhile, combustible materials in the carbon black are abandoned by the landfill treatment means, heat energy cannot be released, and resources cannot be effectively utilized.
Accordingly, the prior art is yet to be improved and developed.
Disclosure of Invention
In view of the above-mentioned deficiencies of the prior art, the present invention aims to provide a method and a system for wet gasification of coal water slurry or hydrocarbon slurry, which aims to solve the problems that the existing coal water slurry gasification process cannot process inferior coal, the application range of the coal water slurry gasification process is limited, and the existing technology cannot effectively separate combustible materials and non-combustible materials in carbon black water, resulting in waste of carbon black resources and low coal water slurry gasification efficiency.
The technical scheme of the invention is as follows:
a wet gasification system for coal water slurry or hydrocarbon slurry comprises a separation device and a gasification device, wherein the separation device is used for effectively separating combustible particles and non-combustible particles in raw coal slurry and carbon black slurry to obtain clean coal slurry, and the gasification device is used for gasifying the clean coal slurry to generate synthesis gas and carbon black slurry; the separation device is communicated with the gasification device through a pipeline, clean coal slurry generated in the separation device is conveyed into the gasification device through a pipeline for gasification treatment, and carbon black slurry generated in the gasification device is conveyed into the separation device through a pipeline to be separated from raw coal slurry together.
The wet gasification system of coal water slurry or hydrocarbon slurry, wherein, separator includes the first wet grinder that is used for grinding raw coal slurry and carbon black thick liquid and obtains mixed coal slurry, with first wet grinder intercommunication and be used for to mix the first agitator tank that mixes is carried out to mixed coal slurry to and be used for to the combustible material granule in the mixed coal slurry carries out separation treatment's knockout tower with non-combustible material granule, inside from bottom to top of knockout tower has set gradually with outside air intercommunication and generates the first distributor of microbubble, with first agitator tank intercommunication and be used for letting in the second distributor that mixes the coal slurry and the third distributor that is used for the water spray.
The wet gasification system of the coal water slurry or the hydrocarbon slurry is characterized in that the top end and the bottom of the separation tower are respectively provided with a combustible slurry outlet and a non-combustible slurry outlet, the combustible slurry outlet is communicated with a first filter press through a pipeline, and the non-combustible slurry outlet is communicated with a second filter press through a pipeline; the first filter press is communicated with a second stirring tank through a pipeline, the second stirring tank is communicated with a clean coal slurry storage tank through a pipeline, and the clean coal slurry storage tank is communicated with the gasification device through a pipeline.
The wet gasification system of the coal water slurry or the hydrocarbon slurry comprises a separation device, a first crusher, a second crusher and a second wet grinder, wherein the separation device further comprises a first crusher, a second crusher and a second wet grinder, the first crusher is used for crushing raw coal to generate coal powder, the second crusher is used for crushing a fluxing agent to generate fluxing agent powder, and the second wet grinder is used for grinding the fluxing agent powder and pulping water to generate fluxing agent slurry; the first crusher is communicated with the first wet grinder through a pipeline, the second crusher is communicated with the second wet grinder through a pipeline, and the second wet grinder is communicated with the second stirring tank through a pipeline.
The coal water slurry or hydrocarbon slurry wet gasification system comprises a gasification furnace, a scrubbing tower, a vacuum flash tank and a settling tank, wherein the gasification furnace is used for gasifying the clean coal slurry to generate crude synthesis gas and carbon black water, the scrubbing tower is used for scrubbing the crude synthesis gas to generate synthesis gas, the vacuum flash tank is used for performing flash evaporation treatment on the carbon black water, the settling tank is used for performing solid-liquid separation treatment on the carbon black water to obtain carbon black slurry and grey water, the bottom of the settling tank is communicated with the first wet grinder through a pipeline, and the gasification furnace, the scrubbing tower, the vacuum flash tank and the settling tank are sequentially communicated through pipelines.
The wet gasification system of the coal water slurry or the hydrocarbon slurry comprises a gasification device, a sedimentation tank, an ash water heater and a vacuum flash tank, wherein the gasification device further comprises a chilling water pump arranged between the gasification furnace and the washing tower, the sedimentation tank is communicated with the ash water tank used for storing ash water through a pipeline, the ash water tank is communicated with the ash water heater through a pipeline, and the ash water heater is respectively communicated with the vacuum flash tank and the washing tower through pipelines.
A method of wet gasification of a coal water slurry or a hydrocarbon slurry, comprising the steps of:
introducing raw coal slurry into a separation device and separating combustible particles and non-combustible particles in the raw coal slurry to obtain refined coal slurry;
introducing the clean coal slurry into a gasification device through a pipeline for gasification treatment to generate synthesis gas and carbon black slurry;
and introducing the carbon black slurry into the separation device and mixing the carbon black slurry with the raw coal slurry to generate mixed coal slurry, separating the mixed coal slurry to obtain clean coal slurry, and circularly feeding the clean coal slurry into the gasification device through a pipeline to perform gasification treatment to generate synthesis gas.
The wet gasification method of the coal water slurry or the hydrocarbon slurry comprises the following steps of:
adding hydrophilic particles, a collector and a surfactant to the first wet grinder and grinding the mixed coal slurry;
introducing external air into a first distributor of the separation tower to generate micro-bubbles, and simultaneously introducing the mixed coal slurry and spray water into a second distributor and a third distributor of the separation tower respectively, wherein the micro-bubbles are combined with hydrophobic combustible particles in the mixed coal slurry to float upwards and flow out of the separation tower from the upstream to form fine coal slurry, and the hydrophilic non-combustible particles in the mixed coal slurry sink and flow out of the separation tower from the bottom.
The wet gasification method of the coal water slurry or the hydrocarbon slurry comprises the following steps of collecting a collector, wherein the collector is an organic matter, the hydrophilic particles comprise but are not limited to aluminosilicate particles, and the particle size of the hydrophilic particles is 1-1000 nm.
The method for wet gasification of coal water slurry or hydrocarbon slurry comprises the step of adding a surfactant to the mixture, wherein the surfactant comprises one or more of, but is not limited to, pinitol oil, camphor oil, phenolic acid mixed fatty alcohol, isomeric hexanols, sec-octanol, inebriated alcohol and lipid substances.
Has the advantages that: the wet gasification system of the coal water slurry or the hydrocarbon slurry comprises a separation device and a gasification device, wherein the separation device is used for effectively separating combustible particles and non-combustible particles in raw coal slurry and carbon black slurry to obtain refined coal slurry, and the gasification device is used for gasifying the refined coal slurry to generate synthetic gas and carbon black slurry. The invention can make all solid fossil energy (including inferior coal or coal gangue) with calorific value can be used for the wet method feeding gasification similar to coal water slurry, expand the raw material source used for coal water slurry entrained flow bed gasification technology, make the cost of producing synthetic gas by gasification technology more competitive, meanwhile the invention can also carry on the combustible particle in the carbon black slurry to separate effectively and return to the said gasification apparatus and continue gasification processing, thus promote the gasification efficiency of the coal water slurry, the said non-combustible particle can also form the filter cake through the filter pressing, is used in fields such as building materials, road and bridge, backfill, etc. as a precious engineering raw materials.
Drawings
FIG. 1 is a schematic structural diagram of a preferred embodiment of a wet gasification system for coal water slurry or hydrocarbon slurry according to the present invention.
FIG. 2 is a schematic structural view of a preferred embodiment of the separation column of the present invention.
FIG. 3 is a flow chart of a preferred embodiment of a method of wet gasification of a coal water slurry or hydrocarbon slurry in accordance with the present invention.
Detailed Description
The invention provides a method and a system for wet gasification of coal water slurry or hydrocarbon slurry, and the invention is further described in detail below in order to make the purpose, technical scheme and effect of the invention clearer and clearer. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a preferred embodiment of a wet gasification system for coal water slurry or hydrocarbon slurry according to the present invention, as shown in the figure,the wet gasification system of the coal water slurry or the hydrocarbon slurry comprises a separation device 100 for effectively separating combustible particles and non-combustible particles in the raw coal slurry and the carbon black slurry to obtain the clean coal slurry, and a gasification device for gasifying the clean coal slurry to generate the synthesis gas (CO and H)2) And a gasification apparatus 200 for carbon black slurry; the separation device 100 is communicated with the gasification device 200 through a pipeline, the clean coal slurry generated in the separation device 100 is conveyed to the gasification device 200 through a pipeline for gasification treatment, and the carbon black slurry generated in the gasification device 200 is conveyed to the separation device 100 through a pipeline to be separated together with the raw coal slurry.
Specifically, the existing coal gasification industry has strict requirements on the quality of the coal water slurry, the prior art can only adopt high-quality coal with the heat value higher than 4500 kcal/kg and the ash content lower than 20wt% as the raw material of the coal water slurry, and inferior coal with the ash content higher than 20wt% cannot be gasified, so that the application range of the coal water slurry gasification process is limited to a great extent, and the inferior coal cannot be effectively utilized.
The carbon black slurry is a byproduct generated by gasifying the coal water slurry, and the existing process can not realize effective separation of combustible particles and non-combustible particles in the carbon black slurry, so that the carbon black slurry is directly subjected to filter pressing treatment to generate a carbon black filter cake, and the carbon black filter cake is used for building products, bricks and landfills or used as boiler fuel. Obviously, the existing carbon black slurry treatment mode wastes resources, reduces the gasification efficiency of the coal water slurry, and simultaneously pollutes the environment.
Based on the technical scheme, the wet gasification system of the coal water slurry or the hydrocarbon slurry comprises a separation device and a gasification device which are communicated through a pipeline, combustible particles and non-combustible particles in the low-quality coal slurry and the carbon black slurry are separated in advance through the separation device, and clean coal slurry formed by the combustible particles can be introduced into the gasification device through the pipeline to be directly gasified. The invention not only expands the application range of the coal water slurry gasification process, but also improves the gasification efficiency of the coal water slurry, and the separated non-combustible particles can form filter cakes through filter pressing, and the filter cakes can be used as a precious engineering raw material in the fields of building materials, roads and bridges, backfilling and the like.
As one embodiment, as shown in fig. 1 and fig. 2, the separation apparatus 100 includes a first crusher 10 for crushing raw coal to generate coal powder, a first wet grinder 11 in communication with the first crusher for grinding raw coal slurry and carbon black slurry to obtain mixed coal slurry, a first stirring tank 12 in communication with the first wet grinder for stirring and mixing the mixed coal slurry, and a separation tower 14 in communication with the first stirring tank for performing separation treatment on combustible particles and non-combustible particles in the mixed coal slurry; inside from supreme first distributor 141, second distributor 142 and the third distributor 143 of having set gradually down of knockout tower 14, first distributor and outside air intercommunication, the second distributor with first agitator tank intercommunication, the third distributor can be used for the water spray with outside water source intercommunication or inside circulating water intercommunication. Preferably, the first distributor, the second distributor and the third distributor inside the separation tower are all tubular or dendritic structures provided with a plurality of through holes, the aperture of each through hole can be set according to the process requirements, and the aperture is preferably 1-3 cm.
The top end and the bottom of the separation tower are respectively provided with a combustible slurry outlet 144 and a non-combustible slurry outlet 145, the combustible slurry outlet is communicated with a first filter press 16 through a pipeline, and the non-combustible slurry outlet is communicated with a second filter press 17 through a pipeline; the first filter press is communicated with a second stirring tank 18 through a pipeline, the second stirring tank is communicated with a clean coal slurry storage tank 19 through a pipeline, and the clean coal slurry storage tank is communicated with the gasification device through a pipeline; the second filter press is communicated with a grey water storage tank for storing grey water through a pipeline, and the grey water storage tank is communicated with a third distributor inside the separation tower through a pipeline.
Further, the separation device also comprises a second crusher 20 for crushing the flux to produce flux powder, a second wet grinder 21 communicating with the second crusher and for grinding the flux powder and the refining water to produce flux slurry, the second wet grinder 21 communicating with the second stirring tank 18 through a pipe. Preferably, the flux is one or more of calcium carbonate, slaked lime, calcium oxide, iron oxide, and quartz sand, but is not limited thereto. More preferably, the flux slurry is further added with additives, the additives are inorganic salts and high molecular organic compounds, preferably polyacrylamide flocculant and carboxymethyl cellulose, molecules of the additives can act on the interface of coal particles and water, internal friction during flowing of the coal water slurry can be reduced, viscosity is reduced, dispersion of the coal particles in the water is improved, stability of the coal water slurry is improved, and bottom material flow of a settling tank is improved.
Specifically, the existing wet coal gasification process cannot directly gasify the poor coal with ash content of more than 20wt%, which greatly limits the application range of the coal water slurry gasification process, and in the existing gasification process, the byproduct carbon black slurry after coal water slurry gasification directly enters a filter press from the bottom of a settling tank, the filter press performs filter pressing treatment on the carbon black slurry to obtain a filter cake, the concentration percentage of solids in the filter cake is 75-95 wt%, and the combustible particles in the solids account for 10-30 wt%, which causes great resource waste of the carbon black slurry. The wet gasification system of the coal water slurry or the hydrocarbon slurry provided by the invention is additionally provided with a separation device for effectively separating combustible particles and non-combustible particles in the original coal slurry and the carbon black slurry on the basis of the traditional coal water slurry gasification process flow, in the wet gasification system, the carbon black slurry enters the separation device from a settling tank of the gasification device and is mixed with the inferior original coal slurry with the ash content of more than 20wt% to form mixed coal slurry, the separation device effectively separates the combustible particles and the non-combustible particles in the mixed coal slurry, the non-combustible slurry is pressed and filtered by a filter press to prepare a filter cake, the concentration percentage of solids in the filter cake is 75-95 wt%, and the percentage of combustibles in the solids is 5-10 wt%; and the concentration percentage of solid in the combustible slurry obtained by separation is 55-75wt.%, wherein the combustible percentage of the solid is 85-99wt.%, and the combustible particle solution forms refined coal slurry and then returns to the gasification device for circular gasification, so that the gasification efficiency of the coal water slurry is improved.
The content of ash impurities (non-combustible particles) in the clean coal slurry entering the gasification device is effectively reduced, namely the amount of the discharged ash slag processed in unit time of the gasification furnace is obviously reduced, so that the physical scouring and chemical erosion degree of the ash slag on refractory bricks forming the wall of the gasification furnace under a high-temperature condition is reduced, namely the operation load of an ash slag discharging system is reduced, the operation period of the gasification device is prolonged, the reliability of the device is improved, the configuration of a backup furnace in the gasification furnace can be realized, and the gasification cost of the coal water slurry is reduced.
More specifically, in the separation device, raw coal is added into a first crusher to be crushed to form coal powder, and the coal powder enters a first wet grinder to be ground together with mill slurry water, a micro-ore separation additive and carbon black slurry returned from a gasification device to form mixed coal slurry. Preferably, the mixed coal slurry is ground to make the average particle size of solid particles in the mixed coal slurry less than 100 microns, and the ground mixed coal slurry enters the first stirring tank to be uniformly stirred.
When the uniformly stirred mixed coal slurry enters a second distributor of the separation tower through a pipeline, introducing outside air into the first distributor, forming micro-bubbles in the air from the first distributor at the bottom of the separation tower, and introducing spray water from a third distributor of the separation tower; in the separation tower, the existence of the micro-bubbles can greatly increase the specific surface area of bubbles in a gas-water phase, the micro-bubbles can adsorb hydrophobic combustible particles in the mixed coal slurry in the process of floating from the bottom of the separation tower, the hydrophilic non-combustible particles cannot float upwards, and the density of the non-combustible particles is higher than that of water, so the non-combustible particles are converged in the separation tower to form bottom flow out of the separation tower; the floating microbubbles carry combustible particles to enter an upstream collecting tank and are converged into an upstream outflow separating tower in the upstream collecting tank. Directly feeding the non-combustible slurry into a second filter press for filter pressing, and discharging the obtained ash filter cake; and the separated combustible slurry enters a first filter press to be filter-pressed to form a clean coal cake, the clean coal cake enters a second stirring tank to be mixed and stirred with the prepared fluxing agent slurry to form clean coal slurry, the clean coal slurry is stored in the clean coal slurry storage tank through a pipeline, and the clean coal slurry in the clean coal slurry storage tank circularly enters the gasification device through the pipeline to be gasified.
As one embodiment, the gasification device 200 includes a gasification furnace 22 for gasifying the refined coal slurry to generate a raw synthesis gas and carbon black water, the bottom of the gasification furnace is communicated with a lock hopper 23 through a pipeline, a slag pool 24 for receiving slag water is disposed under the lock hopper, a scrubbing tower 25 for scrubbing the raw synthesis gas to generate synthesis gas is communicated with the gasification furnace through a pipeline, a vacuum flash tank 26 for flash evaporating the carbon black water is communicated with the scrubbing tower through a pipeline, and a settling tank 27 for solid-liquid separating the carbon black water to obtain carbon black slurry and grey water is communicated with the bottom of the vacuum flash tank through a pipeline.
Further, the gasification device further comprises a chilled water pump 28 arranged between the gasification furnace 22 and the washing tower 25, the settling tank is communicated with an ash water tank 29 for storing ash water through a pipeline, the ash water tank is communicated with an ash water heater 30 through a pipeline, and the ash water heater is respectively communicated with the top of the vacuum flash tank and the middle upper part of the washing tower through a pipeline.
Specifically, after the clean coal slurry prepared from the separation device and oxygen are jointly fed into a gasification furnace, partial oxidation reaction of the clean coal slurry is carried out in the gasification furnace to generate crude synthesis gas, the crude synthesis gas is fed into a washing tower through a pipeline, wherein the incompletely combusted reactant and slag in the gasification furnace are fed into a lock hopper through a pipeline and discharged into a slag pool from the lock hopper, the incompletely combusted reactant and slag are separated into solid slag and carbon black water after being treated in the slag pool, the solid slag is discharged outside, the carbon black water is partially mixed with the carbon black water from the bottom of the washing tower, the mixture is returned to a chilling chamber in the gasification furnace through a chilling water pump to serve as chilling water of the incompletely combusted reactant and the slag, and the rest carbon black water is fed into a downstream vacuum flash tank.
Further, the raw synthesis gas discharged from the chilling chamber of the gasification furnace enters the bottom of a washing tower, and is discharged out of a device system as synthesis gas after being washed by high-pressure flash condensate returned from the downstream, preheated supplementary fresh water and preheated grey water in the washing tower; the main components of the crude synthesis gas are CO and H2And CO2And the like, wherein the synthesis gas contains solid particles such as coarse slag, fine ash and the like, and the solid particles in the crude synthesis gas can be removed after the crude synthesis gas is washed by a washing tower, so that the synthesis gas is obtained. Carbon black water in the vacuum flash tank and part of carbon black water from the slag pool are flashed in the vacuum flash tank, the flashed carbon black water enters the settling tank from the bottom of the vacuum flash tank, the carbon black water is further subjected to solid-liquid separation in the settling tank, clarified grey water enters the grey water tank, and carbon black slurry at the bottom of the settling tank enters the separation device through a pipeline and is separated from raw coal slurry.
Based on the system, the invention also provides a wet gasification method of coal water slurry or hydrocarbon slurry, wherein as shown in figure 3, the wet gasification method comprises the following steps:
s10, introducing the raw coal slurry into a separation device, and separating combustible particles and non-combustible particles in the raw coal slurry to obtain refined coal slurry;
s20, introducing the clean coal slurry into a gasification device through a pipeline for gasification treatment to generate synthesis gas and carbon black slurry;
and S30, introducing the carbon black slurry into the separation device and mixing the carbon black slurry with the raw coal slurry to generate mixed coal slurry, separating the mixed coal slurry to obtain clean coal slurry, and circularly feeding the clean coal slurry into the gasification device through a pipeline to perform gasification treatment to generate synthesis gas.
Specifically, when the gasification apparatus generates a carbon black slurry and the carbon black slurry is mixed with raw coal slurry by piping into the first wet mill, then hydrophilic particles, a collector, and a surfactant are added to the first wet mill and the mixed coal slurry formed from the raw coal slurry and the carbon black slurry is subjected to a grinding process by the first wet mill, preferably grinding solid particles in the mixed coal slurry to an average particle size of less than 100 microns, for example, 10 microns, 30 microns, 50 microns, 70 microns, 90 microns, etc.; within the particle size range, the hydrocarbon combustible particles and the non-combustible mineral particles in the mixed coal slurry can be effectively separated in the subsequent separation tower, and when the diameter of the micro-bubbles in the separation tower is similar to that of the solid particles of the mixed coal slurry, the subsequent separation effect is better.
The hydrophilic particles added in the first wet mill include but are not limited to aluminosilicate particles, the hydrophilic particles have the particle size of 1-1000nm, and the hydrophilic particles can adhere to the surfaces of the non-combustible particles in the mixed coal slurry and gather the fine non-combustible particles into large particles so as to be convenient for sedimentation in a subsequent separation tower; the collector added in the first wet mill is an organic substance, preferably an alkali metal alkyl dithiocarbonate, such as sodium alkyl dithiocarbonate or potassium alkyl dithiocarbonate, and the like, but is not limited thereto; the surfactant is a surface active molecule with a hydrophilic group and a hydrophobic group, preferably one or more of pine alcohol oil, camphor oil, phenolic acid mixed fatty alcohol, isomeric hexanol, sec-octanol, inebriated alcohol and lipid substances, but is not limited to the above; the collecting agent and the surfactant have the effect of reducing the surface tension of the aqueous solution, so that the air filled into the water is easy to disperse into stable bubbles.
Further, when the ground mixed coal slurry enters the first stirring tank, a pH adjusting agent and a flocculating agent may be further added to the first stirring tank, wherein the pH adjusting agent is preferably one or more of lime, sodium carbonate, sodium hydroxide and sulfuric acid, but not limited thereto, and is used for adjusting the pH of the mixed coal slurry to control the surface characteristics of particles, the chemical composition of the mixed coal slurry and the action conditions of other various adjusting agents, thereby improving the separation effect in the separation tower; the flocculating agent is preferably polyacrylamide or starch, and has the function of aggregating solid fine particles into large particles, so that the sedimentation speed of the solid fine particles in water is increased.
In the step S30, when the first distributor is fed with air and forms micro-bubbles, the ground mixed coal slurry and the spray water are fed from the second distributor and the third distributor of the separation tower, respectively, the micro-bubbles combine with hydrophobic combustible particles in the mixed coal slurry to float upwards and flow out of the separation tower from the upstream, and the hydrophilic non-combustible particles in the mixed coal slurry sink and flow out of the separation tower from the downstream.
In summary, the wet gasification system for coal water slurry or hydrocarbon slurry provided by the invention comprises a separation device for effectively separating combustible particles and non-combustible particles in raw coal slurry and carbon black slurry to obtain refined coal slurry, and a gasification device for gasifying the refined coal slurry to generate synthesis gas and carbon black slurry. The invention can make all solid fossil energy (including inferior coal or coal gangue) with calorific value can be used for the wet method feeding gasification similar to coal water slurry, expand the raw material source used for coal water slurry entrained flow bed gasification technology, make the cost of producing synthetic gas by gasification technology more competitive, meanwhile the invention can also carry on the combustible particle in the carbon black slurry to separate effectively and return to the said gasification apparatus and continue gasification processing, thus promote the gasification efficiency of the coal water slurry, the said non-combustible particle can also form the filter cake through the filter pressing, is used in fields such as building materials, road and bridge, backfill, etc. as a precious engineering raw materials.
It is to be understood that the invention is not limited to the examples described above, but that modifications and variations may be effected thereto by those of ordinary skill in the art in light of the foregoing description, and that all such modifications and variations are intended to be within the scope of the invention as defined by the appended claims.
Claims (9)
1. A wet gasification system of coal water slurry or hydrocarbon slurry is characterized by comprising a separation device and a gasification device, wherein the separation device is used for effectively separating combustible particles and non-combustible particles in raw coal slurry and carbon black slurry to obtain clean coal slurry, and the gasification device is used for gasifying the clean coal slurry to generate synthesis gas and carbon black slurry; the separation device is communicated with the gasification device through a pipeline, the clean coal slurry generated in the separation device is conveyed into the gasification device through a pipeline for gasification treatment, and the carbon black slurry generated in the gasification device is conveyed into the separation device through a pipeline to be separated from the raw coal slurry together, wherein the separation device comprises a first wet grinder, a first stirring tank and a separation tower, the first wet grinder is used for grinding the raw coal slurry, the carbon black slurry, grinding slurry water and a micro-mineral separation additive to obtain mixed coal slurry with solid particles having an average particle size of less than 100 micrometers, the first stirring tank is communicated with the first wet grinder and is used for stirring and mixing the mixed coal slurry, the separation tower is used for separating combustible particles and non-combustible particles in the mixed coal slurry, and a first distributor communicated with outside air and generating micro-bubbles is sequentially arranged inside the separation tower from bottom to top, And the second distributor is communicated with the first stirring tank and is used for introducing the mixed coal slurry and the third distributor for spraying water.
2. The coal water slurry or hydrocarbon slurry wet gasification system according to claim 1, wherein a combustible slurry outlet and a non-combustible slurry outlet are respectively arranged at the top end and the bottom of the separation tower, the combustible slurry outlet is communicated with a first filter press through a pipeline, and the non-combustible slurry outlet is communicated with a second filter press through a pipeline; the first filter press is communicated with a second stirring tank through a pipeline, the second stirring tank is communicated with a clean coal slurry storage tank through a pipeline, and the clean coal slurry storage tank is communicated with the gasification device through a pipeline.
3. The coal-water slurry or hydrocarbon slurry wet gasification system according to claim 2, wherein the separation device further comprises a first crusher for crushing raw coal to generate coal dust, a second crusher for crushing flux to generate flux powder, and a second wet grinder for grinding the flux powder and refining water to generate flux slurry; the first crusher is communicated with the first wet grinder through a pipeline, the second crusher is communicated with the second wet grinder through a pipeline, and the second wet grinder is communicated with the second stirring tank through a pipeline.
4. The coal water slurry or hydrocarbon slurry wet gasification system according to claim 1, wherein the gasification device comprises a gasification furnace for gasifying the clean coal slurry to generate raw synthesis gas and carbon black water, a scrubbing tower for scrubbing the raw synthesis gas to generate synthesis gas, a vacuum flash tank for performing flash evaporation treatment on the carbon black water, and a settling tank for performing solid-liquid separation treatment on the carbon black water to obtain carbon black slurry and grey water, wherein the bottom of the settling tank is communicated with the first wet grinder through a pipeline, and the gasification furnace, the scrubbing tower, the vacuum flash tank and the settling tank are communicated in sequence through pipelines.
5. The system of claim 4, wherein the gasifier further comprises a chilled water pump disposed between the gasifier and the scrubber, the settling tank is in communication with an ash tank for storing ash water via a conduit, the ash tank is in communication with an ash water heater via a conduit, and the ash water heater is in communication with the vacuum flash tank and the scrubber via conduits, respectively.
6. A method of wet gasification of a coal water slurry or a hydrocarbon slurry, comprising the steps of:
introducing raw coal slurry into a separation device and separating combustible particles and non-combustible particles in the raw coal slurry to obtain refined coal slurry;
introducing the clean coal slurry into a gasification device through a pipeline for gasification treatment to generate synthesis gas and carbon black slurry;
and introducing the carbon black slurry into the separation device and mixing the carbon black slurry with the raw coal slurry to generate mixed coal slurry, separating the mixed coal slurry to obtain clean coal slurry, and circularly feeding the clean coal slurry into the gasification device through a pipeline to perform gasification treatment to generate synthesis gas.
7. The method for wet gasification of coal-water slurry or hydrocarbon slurry according to claim 6, wherein the step of introducing the carbon black slurry into the separation device and mixing the carbon black slurry with the raw coal slurry to generate a mixed coal slurry, and the step of separating the mixed coal slurry to obtain a refined coal slurry specifically comprises:
adding hydrophilic particles, a collector and a surfactant to the first wet grinder and grinding the mixed coal slurry;
introducing external air into a first distributor of the separation tower to generate micro-bubbles, and simultaneously introducing the mixed coal slurry and spray water into a second distributor and a third distributor of the separation tower respectively, wherein the micro-bubbles are combined with hydrophobic combustible particles in the mixed coal slurry to float upwards and flow out of the separation tower from the upstream to form fine coal slurry, and the hydrophilic non-combustible particles in the mixed coal slurry sink and flow out of the separation tower from the bottom.
8. The method of wet gasification of a coal water slurry or hydrocarbon slurry according to claim 7 wherein the collector is organic and the hydrophilic particles include but are not limited to aluminosilicate particles, the hydrophilic particles having a particle size of 1-1000 nm.
9. The coal-water slurry recycling gasification process according to claim 7, wherein the surfactant comprises one or more of, but not limited to, pinitol oil, camphor oil, phenolic acid mixed fatty alcohol, isomeric hexanols, sec-octanol, inebriated alcohol, and lipid substances.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811115223.7A CN109135837B (en) | 2018-09-25 | 2018-09-25 | Wet gasification method and system for coal water slurry or hydrocarbon slurry |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811115223.7A CN109135837B (en) | 2018-09-25 | 2018-09-25 | Wet gasification method and system for coal water slurry or hydrocarbon slurry |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109135837A CN109135837A (en) | 2019-01-04 |
| CN109135837B true CN109135837B (en) | 2020-10-16 |
Family
ID=64823631
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811115223.7A Active CN109135837B (en) | 2018-09-25 | 2018-09-25 | Wet gasification method and system for coal water slurry or hydrocarbon slurry |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109135837B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110437894A (en) * | 2019-07-30 | 2019-11-12 | 深圳瑞科天启科技有限公司 | A kind of class I liquid I fuel of Diversity and preparation method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101433883A (en) * | 2008-12-18 | 2009-05-20 | 天津大学 | Multilevel adverse current contact iron ore reverse flotation process and equipment |
| CN105293804A (en) * | 2015-11-01 | 2016-02-03 | 张晓峰 | Coal gasification ash water treatment method |
-
2018
- 2018-09-25 CN CN201811115223.7A patent/CN109135837B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101433883A (en) * | 2008-12-18 | 2009-05-20 | 天津大学 | Multilevel adverse current contact iron ore reverse flotation process and equipment |
| CN105293804A (en) * | 2015-11-01 | 2016-02-03 | 张晓峰 | Coal gasification ash water treatment method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109135837A (en) | 2019-01-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111185460B (en) | Resource utilization process for organic hazardous waste | |
| CN1055741C (en) | Efficient utilization of chlorine and moisture-contg. fuels | |
| KR100445363B1 (en) | Waste treatment apparatus and method through vaporization | |
| WO2019001231A1 (en) | Process for producing high calorific value water-coal slurry by utilizing coal or coal gangue, and coal gasification process using same | |
| CN101440310B (en) | Process for fluidized bed classification gasification of dust coal | |
| CN107057787B (en) | The method that coal conversion waste water cascade utilization prepares fuel slurry | |
| CN103497791B (en) | A kind of Novel sludge coal-water slurry and preparation method thereof | |
| CN105505471A (en) | Coal water slurry gasification process method suitable for treating waste water containing high-concentration ammonia and nitrogen and COD | |
| CN101054541B (en) | Sludge petroleum charred slurry and preparing process and application thereof | |
| CN110422975A (en) | Oily waste hot wash-fine slag high-value-use integrated technique based on gasification Heisui River | |
| CN102358849B (en) | Heat recovering type fuel gas preparation system and fuel gas preparation method thereof | |
| CN101985572A (en) | High-concentration sludge coke slurry and preparation method thereof | |
| CN109135837B (en) | Wet gasification method and system for coal water slurry or hydrocarbon slurry | |
| CN113732007B (en) | Recycling method of coal gasification fine slag | |
| CN104651003A (en) | Sludge-petroleum coke-slurry and preparation method thereof | |
| JP3079051B2 (en) | Gasification of waste | |
| CN101639225B (en) | Biomass water-coal-slurry slurring and combustion method and integrated system | |
| CN109135838B (en) | Coal water slurry circulating gasification system and method | |
| CN102191085A (en) | Method for using sludge to produce coal gas | |
| CN211005267U (en) | Device for preparing synthesis gas and steam by utilizing organic hazardous waste | |
| CN110643402A (en) | Method for preparing sludge coal water slurry through sludge viscosity reduction treatment | |
| CN213680557U (en) | Gasification co-processing system of polymorphic discarded object | |
| CN215667857U (en) | Device for innocent treatment of high-sulfur petroleum coke | |
| CN110055105A (en) | A kind of method that low-order coal sub-prime utilizes harmless treatment organic wastewater | |
| CN211771102U (en) | Useless integrated processing system of organic danger |
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 | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |