CN105400548A - Coal hydrogasification method and system - Google Patents
Coal hydrogasification method and system Download PDFInfo
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- CN105400548A CN105400548A CN201510810461.XA CN201510810461A CN105400548A CN 105400548 A CN105400548 A CN 105400548A CN 201510810461 A CN201510810461 A CN 201510810461A CN 105400548 A CN105400548 A CN 105400548A
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- coal
- semicoke
- water slurry
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
- C10J3/46—Gasification of granular or pulverulent flues in suspension
- C10J3/48—Apparatus; Plants
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
- C10J3/72—Other features
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J2300/00—Details of gasification processes
- C10J2300/09—Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
- C10J2300/0913—Carbonaceous raw material
- C10J2300/093—Coal
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J2300/00—Details of gasification processes
- C10J2300/09—Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
- C10J2300/0953—Gasifying agents
- C10J2300/0966—Hydrogen
Abstract
The invention discloses a coal hydrogasification method and system, relates to the technical field of coal gasification, and aims to improve the carbon conversion efficiency of the coal hydrogasification system. The coal hydrogasification method comprises the following processes: coal hydrogasification process: raw coal powder and hydrogen-containing reaction gas are subjected to coal hydrogasification reaction in a coal hydrogasification unit to obtain semicoke; semicoke coal water slurry preparation process: the semicoke obtained in the coal hydrogasification process is utilized to prepare semicoke coal water slurry in the semicoke coal water slurry preparation unit; semicoke coal water slurry gasification process: semicoke coal water slurry is subjected to coal water slurry gasification reaction in the semicoke coal water slurry gasification unit to obtain semicoke gasified raw gas, the semicoke gasified raw gas is subjected to after-treatment to obtain hydrogen-containing product gas, and the hydrogen-containing product gas is fed into the coal hydrogasification unit to participate in the coal hydrogasification reaction.
Description
Technical field
The present invention relates to Coal Gasification Technology field, particularly relate to a kind of coal hydrogenation gasification method and system.
Background technology
Coal hydrogenation gasification is the one of gasification, instigates (800 DEG C ~ 1000 DEG C, the 3MPa ~ 8MPa) reaction under high temperature, condition of high voltage of raw coal powder and hydrogeneous reactant gases to generate and is rich in the gas of methane and the process of light-end products.Compared with traditional gasification, coal hydrogenation gasification has that technique is simple, thermo-efficiency is high, pollute little feature, is thus paid close attention to widely and applies.But; in the process of coal hydrogenation gasification; usually a large amount of semicokes can be produced; the output of semicoke accounts for about 50% of inlet amount; and the carbon content of semicoke is suitable with raw coal powder; there is higher utility value, therefore, how effectively to utilize this part semicoke to become the important factor of the high efficiency of restriction coal hydrogenation gasification system.
In prior art, semicoke is directly discharged usually, and the carbon source therefore in semicoke is not effectively utilized, thus causes the carbon conversion efficiency in coal hydrogenation gasification system lower.
Summary of the invention
The object of the present invention is to provide a kind of coal hydrogenation gasification method and system, be not utilized effectively for the carbon source solved because of semicoke and cause the technical problem that the carbon conversion efficiency of coal hydrogenation gasification system is lower.
To achieve these goals, the invention provides following technical scheme:
On the one hand, the invention provides a kind of coal hydrogenation gasification method, comprising:
Coal hydrogenation gasification operation, raw coal powder and hydrogeneous reactant gases carry out coal hydrogenation gasification reaction in coal hydrogenation gasification unit, obtain semicoke;
Semicoke coal water slurry preparation section, semicoke coal water slurry is prepared unit and is utilized the semicoke obtained in described coal hydrogenation gasification operation to obtain semicoke coal water slurry;
Semicoke coal water slurry gasification operation, semicoke coal water slurry carries out coal water slurry gasification reaction in semicoke coal water slurry gasification unit, obtain char Gasification raw gas, char Gasification raw gas obtains hydrogen-containing product gas through aftertreatment, and hydrogen-containing product gas passes in described coal hydrogenation gasification unit and participates in coal hydrogenation gasification reaction.
On the other hand, the invention provides a kind of coal hydrogenation gasification system, comprise coal hydrogenation gasification unit, semicoke coal water slurry prepares unit and semicoke coal water slurry gasification unit; Wherein,
Described coal hydrogenation gasification unit is used for making raw coal powder and hydrogeneous reactant gases carry out coal hydrogenation gasification reaction, obtains semicoke;
Described semicoke coal water slurry is prepared unit and is communicated with described coal hydrogenation gasification unit, and described semicoke coal water slurry is prepared unit and utilized the semicoke exported by described coal hydrogenation gasification unit to obtain semicoke coal water slurry;
Described semicoke coal water slurry gasification unit is prepared unit with described semicoke coal water slurry respectively and is communicated with described coal hydrogenation gasification unit, coal water slurry gasification reaction is carried out for making the semicoke coal water slurry being prepared unit output by described semicoke coal water slurry, obtain char Gasification raw gas, carry out aftertreatment to char Gasification raw gas and obtain hydrogen-containing product gas, hydrogen-containing product gas passes in described coal hydrogenation gasification unit and participates in coal hydrogenation gasification reaction.
In coal hydrogenation gasification method provided by the invention, in semicoke coal water slurry preparation section, prepare unit by semicoke coal water slurry and the semicoke obtained in coal hydrogenation gasification operation is made semicoke coal water slurry, in semicoke coal water slurry gasification operation, semicoke coal water slurry generation coal water slurry gasification reaction obtained in semicoke coal water slurry preparation section is made by semicoke coal water slurry gasification unit, obtain char Gasification raw gas, and aftertreatment is carried out to char Gasification raw gas, obtain hydrogen-containing product gas, hydrogen-containing product gas passes in coal hydrogenation gasification unit, as the unstripped gas of hydrogeneous reactant gases.Therefore, coal hydrogenation gasification method provided by the invention utilizes the semicoke with higher carbon content obtained in coal hydrogenation gasification operation to generate hydrogen-containing product gas, for the coal hydrogenation gasification in coal hydrogenation gasification operation reacts gas of supplying raw materials, compared with semicoke directly being discharged with prior art, efficiently utilize the carbon source in semicoke, thus improve the carbon conversion efficiency in coal hydrogenation gasification system.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide a further understanding of the present invention, forms a part of the present invention, and schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
The schematic flow sheet of the coal hydrogenation gasification method that Fig. 1 provides for the embodiment of the present invention;
The schematic flow sheet of a kind of semicoke coal water slurry preparation technology that Fig. 2 provides for the embodiment of the present invention;
The schematic flow sheet of the another kind of semicoke coal water slurry preparation technology that Fig. 3 provides for the embodiment of the present invention;
The schematic flow sheet of the semicoke coal-water slurry gasification that Fig. 4 provides for the embodiment of the present invention;
The schematic flow sheet of the coal hydrogenation gasification technique that Fig. 5 provides for the embodiment of the present invention;
The structural representation of a kind of coal hydrogenation gasification system that Fig. 6 provides for the embodiment of the present invention;
The structural representation of the another kind of coal hydrogenation gasification system that Fig. 7 provides for the embodiment of the present invention;
Fig. 8 prepares the structural representation of unit for a kind of semicoke coal water slurry that the embodiment of the present invention provides;
Fig. 9 prepares the structural representation of unit for another kind of semicoke coal water slurry that the embodiment of the present invention provides.
Reference numeral:
10-coal hydrogenation gasification unit, 20-semicoke coal water slurry prepares unit,
30-semicoke coal water slurry gasification unit, 11-coal hydrogenation gasification stove,
12-cleaning apparatus, 13-heat-exchanger rig,
14-oil product extraction element, 15-hydrogen separation device,
16-semicoke cooling dropping equipment, 21-semicoke milling apparatus,
22-pulverized coal grinding device, 23-wet grinding device,
24-mixed pulp device, 25-drying unit,
26-shredder assembly, 27-vibratory screening apparatus,
31-coal slurry gasifier, 32-carbon monoxide conversion device,
33-product gas refining plant.
Embodiment
In order to further illustrate the coal hydrogenation gasification system and method that the embodiment of the present invention provides, be described in detail below in conjunction with Figure of description.
Refer to Fig. 1, the embodiment of the present invention provides a kind of coal hydrogenation gasification method, comprising:
Step 100, coal hydrogenation gasification operation, raw coal powder and hydrogeneous reactant gases carry out coal hydrogenation gasification reaction in coal hydrogenation gasification unit, obtain semicoke;
Step 200, semicoke coal water slurry preparation section, semicoke coal water slurry is prepared unit and is utilized the semicoke obtained in coal hydrogenation gasification operation to obtain semicoke coal water slurry;
Step 300, semicoke coal water slurry gasification operation, semicoke coal water slurry carries out coal water slurry gasification reaction in semicoke coal water slurry gasification unit, obtain char Gasification raw gas, char Gasification raw gas obtains hydrogen-containing product gas through aftertreatment, and hydrogen-containing product gas passes in coal hydrogenation gasification unit and participates in coal hydrogenation gasification reaction.
In the coal hydrogenation gasification method that the embodiment of the present invention provides, in semicoke coal water slurry preparation section, prepare unit by semicoke coal water slurry and the semicoke obtained in coal hydrogenation gasification operation is made semicoke coal water slurry, in semicoke coal water slurry gasification operation, semicoke coal water slurry generation coal water slurry gasification reaction obtained in semicoke coal water slurry preparation section is made by semicoke coal water slurry gasification unit, obtain char Gasification raw gas, and aftertreatment is carried out to char Gasification raw gas, obtain hydrogen-containing product gas, hydrogen-containing product gas passes in coal hydrogenation gasification unit, as the unstripped gas of hydrogeneous reactant gases.Therefore, the coal hydrogenation gasification method that the embodiment of the present invention provides utilizes the semicoke with higher carbon content obtained in coal hydrogenation gasification operation to generate hydrogen-containing product gas, for the coal hydrogenation gasification in coal hydrogenation gasification operation reacts gas of supplying raw materials, compared with semicoke directly being discharged with prior art, efficiently utilize the carbon source in semicoke, thus improve the carbon conversion efficiency in coal hydrogenation gasification system.
In addition, the coal hydrogenation gasification method that the embodiment of the present invention provides by coal hydrogenation gasification unit, semicoke coal water slurry prepare unit and semicoke coal water slurry gasification unit with the use of, the semicoke with higher carbon content utilizing coal hydrogenation gasification to react acquisition generates hydrogen-containing product gas, for the coal hydrogenation gasification in coal hydrogenation gasification unit reacts gas of supplying raw materials, achieve the hydrogen equilibrium of supply and demand of coal hydrogenation gasification system, decrease the demand of coal hydrogenation gasification system external circle hydrogen, thus save cost.
Moreover, the coal hydrogenation gasification method that the embodiment of the present invention provides by coal hydrogenation gasification unit, semicoke coal water slurry prepare unit and semicoke coal water slurry gasification unit with the use of, the semicoke with higher carbon content utilizing coal hydrogenation gasification to react acquisition generates hydrogen-containing product gas, for the coal hydrogenation gasification in coal hydrogenation gasification unit reacts gas of supplying raw materials, with in prior art directly by compared with coal-char combustion, decrease energy dissipation, and decrease environmental pollution.
In the above-described embodiments, after coal hydrogenation gasification operation completes, the semicoke obtained is porous particle, and wetting ability is more weak, the concentration lower (being about 40%) of the semicoke coal water slurry thus only using semicoke to obtain, therefore, in order to improve the slurry concentration of semicoke coal water slurry, by obtained for semicoke grinding semi-coke powder, and in semicoke coal water slurry, the coal powder for slurry preparation obtained by raw coal also can be added, by carrying out grain size distribution to semi-coke powder and coal powder for slurry preparation, to improve the slurry concentration of semicoke coal water slurry.Semicoke coal water slurry preparation section can adopt following two kinds of modes:
Mode one, refers to Fig. 2, and semicoke coal water slurry comprises semi-coke powder and coal powder for slurry preparation, and semicoke coal water slurry is prepared unit and comprised semicoke milling apparatus and pulverized coal grinding device, and semicoke coal water slurry preparation section comprises:
Step 210, grinding steps, grind to form semi-coke powder to the semicoke obtained in coal hydrogenation gasification operation by semicoke milling apparatus, grind to form coal powder for slurry preparation to raw coal by pulverized coal grinding device, the median size of coal powder for slurry preparation is greater than the median size of semi-coke powder;
Step 220, semicoke coal water slurry preparation process, mix semi-coke powder, coal powder for slurry preparation and water, obtained semicoke coal water slurry.
During concrete enforcement, in grinding steps, before by semicoke milling apparatus the semicoke obtained in coal hydrogenation gasification operation being ground to form semi-coke powder, cooling step-down can also be carried out to the semicoke obtained in coal hydrogenation gasification operation, utilize semicoke milling apparatus to grind semicoke to facilitate, before by pulverized coal grinding device raw coal being ground to form coal powder for slurry preparation, first raw coal can be placed in drying unit to dry, the water content of the raw coal after drying is less than or equal to 8%, raw coal after the oven dry of drying device is placed in shredder assembly, and in shredder assembly, be crushed into the raw coal particle that particle diameter is less than or equal to 10mm, drying raw coal particle after fragmentation is placed in pulverized coal grinding device, in pulverized coal grinding device, grinding forms initial coal dust, then initial coal dust is made to cross vibratory screening apparatus, obtain satisfactory coal powder for slurry preparation, undesirable rough coal powder is then back in pulverized coal grinding device and continues grinding.
In semicoke coal water slurry preparation technology, semi-coke powder, coal powder for slurry preparation and water can be placed in mixed pulp device according to certain ratio, and semi-coke powder, coal powder for slurry preparation and water are stirred, obtained semicoke coal water slurry.
In semicoke coal water slurry preparation section, first semicoke is ground to form semi-coke powder, coal grinding is become coal powder for slurry preparation, and the median size of semi-coke powder is less than the median size of coal powder for slurry preparation, mutually mixed by coal powder for slurry preparation larger to semi-coke powder less for median size and particle diameter, by grain size distribution, the semi-coke powder that median size is less is filled in the space of the larger coal powder for slurry preparation of median size, thus improve the slurry concentration of semicoke coal water slurry, and improve stability and the mobility of semicoke coal water slurry.
It is worth mentioning that, there is rapid expansion in the process that semicoke in porous particle mainly reacts at coal hydrogenation gasification due to raw coal powder and formed, thus semicoke is easier to grind, and raw coal is difficult to grind compared to semicoke, thus according to the grindability index of semicoke and raw coal, semicoke and raw coal are ground respectively, semicoke is ground to form the semi-coke powder that median size is less, raw coal is ground to form the coal powder for slurry preparation that median size is larger, effectively can reduce energy expenditure when semicoke and raw coal are ground respectively, and the time saved when semicoke and raw coal are ground respectively.
The semicoke coal water slurry preparation section that mode one provides is for adopting dry method slurrying, and semicoke coal water slurry preparation section can also for adopting wet-dry change slurrying.
Mode two, refers to Fig. 3, and semicoke coal water slurry comprises semi-coke powder and coal powder for slurry preparation, and semicoke coal water slurry is prepared unit and comprised semicoke milling apparatus and wet grinding device, and semicoke coal water slurry preparation section comprises:
Step 210 ', semicoke grinding steps, grind to form semi-coke powder to the semicoke obtained in coal hydrogenation gasification operation by semicoke milling apparatus;
Step 220 ', semicoke water slurry preparation process, semi-coke powder is mixed with water and stirs, obtained semicoke water slurry;
Step 230 ', semicoke coal water slurry preparation process, by wet grinding device, semicoke water slurry, raw coal and water are ground, form semicoke coal water slurry.
During concrete enforcement, in semicoke coal water slurry preparation process, before by wet grinding device semicoke water slurry, raw coal and water being ground simultaneously, first raw coal can be placed in shredder assembly, the raw coal particle that particle diameter is less than or equal to 10mm is crushed in shredder assembly, raw coal particle, semicoke water slurry and water are placed in wet grinding device simultaneously, and in wet grinding device, grinding forms the semicoke coal water slurry be made up of semi-coke powder, coal powder for slurry preparation and water.In mode two, when raw coal is ground, adopting wet grinding, carrying out compared with grinding, having saved the energy to raw coal with adopting the mode of dry grinding in mode one.
In order to improve the slurry concentration of semicoke coal water slurry further, preferably, in semicoke coal water slurry, the mass ratio of semi-coke powder and coal powder for slurry preparation is 1:9 ~ 1:1; Semicoke coal water slurry comprises water, and the mass percent that water accounts for semicoke coal water slurry is 30% ~ 40%.For example, refer to table 1, when the mass ratio of semi-coke powder and coal powder for slurry preparation elects 1:9 as, through measuring, the slurry concentration of obtained semicoke coal water slurry is 65%; When the mass ratio of semi-coke powder and coal powder for slurry preparation elects 3:7 as, through measuring, the slurry concentration of obtained semicoke coal water slurry is 62%; When the mass ratio of semi-coke powder and coal powder for slurry preparation elects 1:1 as, through measuring, the slurry concentration of obtained semicoke coal water slurry is 60%.To sum up, when electing the mass ratio of semi-coke powder and coal powder for slurry preparation as 1:9 ~ 1:1, the slurry concentration of obtained semicoke coal water slurry is all more than or equal to 60%, satisfied requirement semicoke coal water slurry be delivered in semicoke coal water slurry gasification unit, and meets the feed needs of semicoke coal water slurry gasification unit.
Table 1
In semicoke coal water slurry, the mass percent that water accounts for semicoke coal water slurry is 30% ~ 40%, can meet the requirement of producing semicoke coal water slurry, ensures that the concentration of semicoke coal water slurry is higher, makes semicoke coal water slurry have good mobility and stability simultaneously.
In embodiments of the present invention, in semicoke coal water slurry, the median size of semi-coke powder is 10 μm ~ 50 μm; The median size of coal powder for slurry preparation is 200 μm ~ 350 μm.In mode one, by semicoke milling apparatus, semicoke is ground to the semi-coke powder that median size is 10 μm ~ 50 μm, when the median size because of semi-coke powder can be prevented to be greater than 50 μm, semi-coke powder hydrophobicity is comparatively strong and cause slurrying difficulty to increase, can prevent simultaneously the median size because of semi-coke powder be less than 10 μm and cause grinding semicoke time time lengthening; By pulverized coal grinding device, raw coal is ground to the coal powder for slurry preparation that median size is 200 μm ~ 350 μm, the coal powder for slurry preparation of this particle size range and median size are that the grating effect of the semi-coke powder of 10 μm ~ 50 μm is better, and are that the semi-coke powder of 10 μm ~ 50 μm mixes the semicoke coal water slurry obtained and has good mobility and stability by the coal powder for slurry preparation of this particle size range and median size.
It is worth mentioning that, when employing mode two prepares semicoke coal water slurry, because semicoke successively have passed through the grinding of semicoke milling apparatus and wet grinding device, thus 50 μm can be greater than by semicoke milling apparatus to the median size that semicoke carries out the semi-coke powder that grinding obtains.
When employing mode one prepares semicoke coal water slurry, the median size of semi-coke powder is 10 μm ~ 50 μm, the median size of coal powder for slurry preparation is 200 μm ~ 350 μm, compared to coal powder for slurry preparation, semi-coke powder is a kind of ultrafine powder, and when raw coal being ground by pulverized coal grinding device, also the ultrafine powder that the median size of part particle diameter and semi-coke powder is suitable can be obtained, in order to prevent the slurry concentration causing semicoke coal water slurry in the semicoke coal water slurry for preparing containing too much ultrafine powder, mobility and stability reduce, preferably, initial coal dust is obtained after raw coal being ground by pulverized coal grinding device, initial coal dust is sieved by two-time vibration, during by first time vibratory screening apparatus, rough coal dressing sieve particle diameter being greater than the maximum particle diameter (such as 1000 μm) of coal powder for slurry preparation is elected, during by second time vibratory screening apparatus, the ultrafine powder of the median size of particle diameter and semi-coke powder quite (such as particle diameter is less than or equal to 45 μm) is screened.When preparing semicoke coal water slurry, the coal powder for slurry preparation that the median size of semi-coke powder and particle diameter and semi-coke powder is suitable forms ultrafine powder, the mass percent that ultrafine powder accounts for the solid material of semicoke coal water slurry should be 50%, namely ultrafine powder accounts for 50% of the quality summation of semi-coke powder and coal powder for slurry preparation, to prevent from causing the slurry concentration of semicoke coal water slurry, mobility and stability all to decline containing too much ultrafine powder in semicoke coal water slurry.
It is worthy of note, the maximum particle diameter of coal powder for slurry preparation is preferably less than or equal to 1000 μm, with prevent the particle diameter because of coal powder for slurry preparation be greater than 1000 μm and reduce semicoke coal water slurry generation coal water slurry gasification reaction time speed of reaction and chemical conversion rate.
In order to improve stability and the mobility of semicoke coal water slurry, in embodiments of the present invention, semicoke coal water slurry also comprises additive, and the mass percent that additive accounts for semicoke coal water slurry is 0.2% ~ 2%.During concrete enforcement, when employing mode one prepares semicoke coal water slurry, additive can be placed in mixed pulp device with semi-coke powder, coal powder for slurry preparation and water simultaneously, mix rear formation semicoke coal water slurry, also can be placed in mixed pulp device again after semi-coke powder, coal powder for slurry preparation and water being stirred, mix rear formation semicoke coal water slurry; When employing mode two prepares semicoke coal water slurry, additive can be placed in wet grinding device with semicoke water slurry, raw coal, water simultaneously, by wet grinding device, additive, semi-coke powder, coal powder for slurry preparation and water are mixed, form the semicoke coal water slurry containing additive.
In semicoke coal water slurry, add additive, to prevent semicoke coal water slurry from producing precipitation in the process of conveying, and reduce the viscosity of semicoke coal water slurry, thus improve stability and the mobility of semicoke coal water slurry.In semicoke coal water slurry, add the additive of 0.2% ~ 2%, prevent because additive too much causes the preparation cost of semicoke coal water slurry to increase, while can prevent from causing because additive is very few to the stability of semicoke coal water slurry and the improvement effect of mobility poor.
In above-described embodiment, additive can be multiple, and such as, lignosulfonic acid system additive, naphthene sulfonic acid system additive, amido sulfoacid series additive etc., can also for the mixed additive by being formed after carrying out proportioning to multiple additives.In embodiments of the present invention, additive is naphthene sulfonic acid system additive.
Refer to Fig. 4, semicoke coal water slurry gasification unit comprises coal slurry gasifier, after-treatment device, and semicoke coal water slurry gasification operation comprises:
Step 310, semicoke coal water slurry gasification step, be placed in coal slurry gasifier by semicoke coal water slurry, oxygen-containing gas, makes semicoke coal water slurry that coal water slurry gasification reaction occur in coal slurry gasifier, obtain char Gasification raw gas;
Step 320, raw gas post-processing step, char Gasification raw gas is passed in after-treatment device, after-treatment device carries out aftertreatment to char Gasification raw gas, obtains hydrogen-containing product gas, and hydrogen-containing product gas passes in coal hydrogenation gasification unit and participates in coal hydrogenation gasification reaction.
During concrete enforcement, in semicoke coal water slurry gasification step, semicoke coal water slurry and oxygen-containing gas occur after coal water slurry gasification reacts in coal slurry gasifier, and the char Gasification raw gas of acquisition mainly comprises carbon monoxide and hydrogen, after-treatment device comprises carbon monoxide conversion device and product gas refining plant, in raw gas post-processing step, char Gasification raw gas containing carbon monoxide and hydrogen passes in carbon monoxide conversion device, and CO shift reaction is being there is in carbon monoxide conversion device, the carbon monoxide in char Gasification raw gas is made to generate hydrogen after CO shift reaction, in carbon monoxide conversion device, there is the char Gasification raw gas after CO shift reaction pass into product gas refining plant, a small amount of carbon monoxide that product gas refining plant will occur in the char Gasification raw gas after CO shift reaction in carbon monoxide conversion device, a small amount of sulfurous gas etc. are unfavorable for that the gas that coal hydrogenation gasification reacts is removed, form the hydrogen-containing product gas based on hydrogen.
Refer to Fig. 5, in embodiments of the present invention, coal hydrogenation gasification unit comprises coal hydrogenation gasification stove, semicoke cooling dropping equipment and gas-purification separation device, and wherein, be provided with chilling device in coal hydrogenation gasification stove, coal hydrogenation gasification operation comprises:
Step 110, raw coal powder and hydrogeneous reactant gases carry out coal hydrogenation gasification reaction in coal hydrogenation gasification stove, obtain semicoke and coal hydrogenation gasification raw gas;
Step 120, by semicoke cooling dropping equipment, cooling step-down is carried out to the semicoke that coal hydrogenation gasification reaction obtains, lead to semicoke coal water slurry prepares in unit through cooling the semicoke after step-down;
Step 130, coal hydrogenation gasification raw gas pass into gas-purification separation device after coal gas chilling device Quench, by gas-purification separation device, purification separation is carried out to the coal hydrogenation gasification raw gas after coal gas chilling device Quench, obtain hydrogeneous residual gas, hydrogeneous residual gas passes in coal hydrogenation gasification stove and participates in coal hydrogenation gasification reaction.
In the above-described embodiments, the semicoke that coal hydrogenation gasification reaction obtains is lowered the temperature after also step-down in semicoke cooling dropping equipment, passing into semicoke coal water slurry again prepares in unit, can prevent the temperature and pressure preparing the semicoke in unit because being delivered to semicoke coal water slurry from causing slurrying difficulty to increase comparatively greatly, convenient preparation in unit in semicoke coal water slurry carries out pulp making operations.
Gas-purification separation device comprises cleaning apparatus, heat-exchanger rig, oil product extraction element and hydrogen separation device, and the outlet of the raw gas of coal hydrogenation gasification stove is communicated with cleaning apparatus, the cold side of heat-exchanger rig, oil product extraction element and hydrogen separation device successively, the entrance of the heat absorbing side of heat-exchanger rig is communicated with hydrogen separation device and semicoke coal water slurry gasification unit, and the outlet of the heat absorbing side of heat-exchanger rig is communicated with coal hydrogenation gasification stove.Raw coal powder and hydrogeneous reactant gases carry out coal hydrogenation gasification reaction in coal hydrogenation gasification stove, also obtain the coal hydrogenation gasification raw gas containing light-end products (such as benzene, toluene, naphthalene etc.), methane and hydrogen etc., the coal hydrogenation gasification raw gas that coal hydrogenation gasification reaction obtains passes into cleaning apparatus after the chilling device Quench in coal hydrogenation gasification stove, is fallen by the fine particle carbocoal filtering carried secretly by cleaning apparatus in coal hydrogenation gasification raw gas, coal hydrogenation gasification raw gas after dedusting passes into the cold side of heat-exchanger rig, heat exchange is carried out with the gas in the heat absorbing side of heat-exchanger rig, gas in the heat absorbing side of heat exchanging device carries out preheating, make to reach about 600 DEG C by the temperature of the outlet expellant gas in the heat absorbing side of heat-exchanger rig, the coal hydrogenation gasification raw gas that the coal hydrogenation gasification raw gas cooling formation temperature after dedusting reduces, the coal hydrogenation gasification raw gas that temperature reduces passes in oil product extraction element, and the light-end products in coal hydrogenation gasification raw gas temperature reduced by oil product extraction element are extracted, the coal hydrogenation gasification raw gas extracted after light-end products passes in hydrogen separation device, be unfavorable for that gas delivery that coal hydrogenation gasification reacts out by hydrogen separation device by extracting in the coal hydrogenation gasification raw gas after light-end products, obtain hydrogeneous residual gas, hydrogeneous residual gas passes into the heat absorbing side of heat-exchanger rig, coal hydrogenation gasification stove is led to after heat exchange in heat-exchanger rig, as the unstripped gas of hydrogeneous reactant gases, participation coal hydrogenation gasification reacts, after the coal hydrogenation gasification raw gas after extraction light-end products being processed by hydrogen separation device, also obtain methane.Gas in the heat absorbing side of heat-exchanger rig comprises the hydrogen-containing product gas exported by semicoke coal water slurry gasification unit, the hydrogeneous residual gas exported by hydrogen separation device and extraneous hydrogen.
Quench under the effect of the chilling device of coal hydrogenation gasification raw gas in coal hydrogenation gasification stove that coal hydrogenation gasification reaction obtains, can prevent the light-end products in coal hydrogenation gasification raw gas from high temperature decomposing; Coal hydrogenation gasification raw gas after Quench obtains hydrogeneous residual gas after gas-purification separation device process, hydrogeneous residual gas passes in coal hydrogenation gasification stove, participation coal hydrogenation gasification reacts, the efficient circulation achieving hydrogen utilizes, decrease the demand of coal hydrogenation gasification system external circle hydrogen, save cost.
Refer to Fig. 6, the embodiment of the present invention also provides a kind of coal hydrogenation gasification system, comprises coal hydrogenation gasification unit 10, semicoke coal water slurry prepares unit and 20 and semicoke coal water slurry gasification unit 30; Wherein, coal hydrogenation gasification unit 10 carries out coal hydrogenation gasification reaction for making raw coal powder and hydrogeneous reactant gases, obtains semicoke; Semicoke coal water slurry is prepared unit 20 and is communicated with coal hydrogenation gasification unit 10, and semicoke coal water slurry is prepared unit 20 and utilized the semicoke exported by coal hydrogenation gasification unit 10 to obtain semicoke coal water slurry; Semicoke coal water slurry gasification unit 30 is prepared unit 20 with semicoke coal water slurry respectively and is communicated with coal hydrogenation gasification unit 10, coal water slurry gasification reaction is carried out for making to prepare by semicoke coal water slurry the semicoke coal water slurry that unit 20 exports, obtain char Gasification raw gas, carry out aftertreatment to char Gasification raw gas and obtain hydrogen-containing product gas, hydrogen-containing product gas passes in coal hydrogenation gasification unit 10 and participates in coal hydrogenation gasification reaction.
During concrete enforcement, please continue to refer to Fig. 6, raw coal powder and hydrogeneous reactant gases are input in coal hydrogenation gasification unit 10, and coal hydrogenation gasification reaction occurs in coal hydrogenation gasification unit 10, obtain the semicoke with higher carbon content; The semicoke that coal hydrogenation gasification reaction obtains is transported to semicoke coal water slurry and prepares in unit 20, under preparing the effect of unit 20, forms semicoke coal water slurry in semicoke coal water slurry; Semicoke coal water slurry is transported in semicoke coal water slurry gasification unit 30, and in semicoke coal water slurry gasification unit 30, there is water-gas slurry gasification reaction, obtain char Gasification raw gas, main containing carbon monoxide and hydrogen in char Gasification raw gas, char Gasification raw gas is after aftertreatment, and obtain hydrogen-containing product gas, hydrogen-containing product gas is transported in coal hydrogenation gasification unit 10, as the unstripped gas of hydrogeneous reactant gases, participate in coal hydrogenation gasification reaction.
As from the foregoing, in the coal hydrogenation gasification system that the embodiment of the present invention provides, prepare unit 20 by semicoke coal water slurry and the semicoke exported by coal hydrogenation gasification unit 10 is made semicoke coal water slurry, by semicoke coal water slurry gasification unit 30, the semicoke coal water slurry generation coal water slurry gasification preparing unit 20 obtained by semicoke coal water slurry is reacted, obtain char Gasification raw gas, and aftertreatment is carried out to char Gasification raw gas, obtain hydrogen-containing product gas, hydrogen-containing product gas passes in coal hydrogenation gasification unit 10, as the unstripped gas of hydrogeneous reactant gases, participation coal hydrogenation gasification reacts.Therefore, the coal hydrogenation gasification system that the embodiment of the present invention provides by coal hydrogenation gasification unit 10, semicoke coal water slurry prepare unit 20 and semicoke coal water slurry gasification unit 30 with the use of, the semicoke with higher carbon content utilizing coal hydrogenation gasification to react acquisition generates hydrogen-containing product gas, for the coal hydrogenation gasification in coal hydrogenation gasification unit 10 reacts gas of supplying raw materials, with in prior art, semicoke is directly discharged compared with coal hydrogenation gasification system, efficiently utilize the carbon source in semicoke, thus improve the carbon conversion efficiency in coal hydrogenation gasification system.
In addition, the coal hydrogenation gasification system that the embodiment of the present invention provides by coal hydrogenation gasification unit 10, semicoke coal water slurry prepare unit 20 and semicoke coal water slurry gasification unit 30 with the use of, the semicoke with higher carbon content utilizing coal hydrogenation gasification to react acquisition generates hydrogen-containing product gas, for the coal hydrogenation gasification in coal hydrogenation gasification unit 10 reacts gas of supplying raw materials, achieve the hydrogen equilibrium of supply and demand of coal hydrogenation gasification system, decrease the demand of coal hydrogenation gasification system external circle hydrogen, thus save cost.
Moreover, the coal hydrogenation gasification system that the embodiment of the present invention provides by coal hydrogenation gasification unit 10, semicoke coal water slurry prepare unit 20 and semicoke coal water slurry gasification unit 30 with the use of, the semicoke with higher carbon content utilizing coal hydrogenation gasification to react acquisition generates hydrogen-containing product gas, for the coal hydrogenation gasification in coal hydrogenation gasification unit 10 reacts gas of supplying raw materials, with in prior art directly by compared with coal-char combustion, decrease energy dissipation, and decrease environmental pollution.
In the above-described embodiments, after there is coal hydrogenation gasification reaction in raw coal powder and hydrogeneous reactant gases in coal hydrogenation gasification unit 10, the semicoke obtained is porous particle, wetting ability is more weak, the concentration lower (being about 40%) of the semicoke coal water slurry thus only using semicoke to obtain, therefore, in order to improve the slurry concentration of semicoke coal water slurry, can by obtained for semicoke grinding semi-coke powder, and in semicoke coal water slurry, also can add the coal powder for slurry preparation obtained by raw coal, by carrying out grain size distribution to semi-coke powder and coal powder for slurry preparation, to improve the slurry concentration of semicoke coal water slurry.The preparation technology of semicoke coal water slurry can adopt dry method slurrying and wet method slurrying two kinds of modes.
When adopting the mode of dry method slurrying to prepare semicoke coal water slurry, refer to Fig. 7, semicoke coal water slurry is prepared unit 20 and is comprised: the semicoke milling apparatus 21 semicoke being ground to the semi-coke powder obtaining less median size, and the pulverized coal grinding device 22 raw coal being ground to the coal powder for slurry preparation obtaining larger median size.
During concrete enforcement, refer to Fig. 8, the semicoke exported by coal hydrogenation gasification unit 10 is placed in semicoke milling apparatus 21, and in semicoke milling apparatus 21, grinding forms semi-coke powder; Raw coal is first placed in drying unit 25 and is dried, and the water content of the raw coal after drying is less than or equal to 8%; Raw coal after drying device 25 oven dry is placed in shredder assembly 26, is crushed into the raw coal particle that particle diameter is less than or equal to 10mm in shredder assembly 26; Drying raw coal particle after fragmentation is placed in pulverized coal grinding device 22, in pulverized coal grinding device 22, grinding forms initial coal dust, make initial coal dust cross vibratory screening apparatus 27, obtain satisfactory coal powder for slurry preparation, undesirable rough coal powder is then back in pulverized coal grinding device 22 and continues grinding; Semi-coke powder and coal powder for slurry preparation are thrown in by a certain percentage in mixed pulp device 24, injects a certain amount of water, stir, be i.e. obtained semicoke coal water slurry.
Semicoke is ground to form semi-coke powder, coal grinding is become coal powder for slurry preparation, and the median size of semi-coke powder is less than the median size of coal powder for slurry preparation, coal powder for slurry preparation larger to semi-coke powder less for median size and particle diameter is mixed mutually, pass through grain size distribution, the semi-coke powder that median size is less is filled in the space of the larger coal powder for slurry preparation of median size, thus improves the slurry concentration of semicoke coal water slurry, and improves stability and the mobility of semicoke coal water slurry.
It is worth mentioning that, there is rapid expansion in the process that the semicoke of porous particle mainly reacts at coal hydrogenation gasification due to raw coal powder and formed, thus semicoke is easier to grind, and raw coal is difficult to grind compared to semicoke, thus according to the grindability index of semicoke and raw coal, semicoke and raw coal are ground respectively, semicoke is ground to form the semi-coke powder that median size is less, raw coal is ground to form the coal powder for slurry preparation that median size is larger, effectively can reduce energy expenditure when semicoke and raw coal are ground respectively, and the time saved when semicoke and raw coal are ground respectively.
In above-described embodiment, semicoke milling apparatus 21 and pulverized coal grinding device 22 can be selected according to the grinding difficulty of semicoke and raw coal, such as, can be ball mill, column mill, rod mill, autogenous mill etc.In embodiments of the present invention, semicoke milling apparatus 21 is ball mill or rod mill, and pulverized coal grinding device 22 is ball mill or rod mill.
When adopting the mode of wet method slurrying to prepare semicoke coal water slurry, refer to Fig. 9, semicoke coal water slurry is prepared unit and is comprised: grind to semicoke the semicoke milling apparatus 21 obtaining semi-coke powder, and grinds to semi-coke powder, water and raw coal the wet grinding device 23 obtaining semicoke coal water slurry simultaneously.
During concrete enforcement, the semicoke exported by coal hydrogenation gasification unit 10 directly inputs in semicoke milling apparatus 21, and in semicoke milling apparatus 21, grinding forms semi-coke powder; Semi-coke powder is mixed with water and stirs, to form semicoke water slurry, raw coal is placed in shredder assembly 26, the raw coal particle that particle diameter is less than or equal to 10mm is crushed in shredder assembly 26, then raw coal particle, semicoke water slurry and water are placed in wet grinding device 23 according to a certain percentage to grind, to form the semicoke coal water slurry be made up of semi-coke powder, coal powder for slurry preparation and water.In employing wet method slurrying, when raw coal is ground, adopting wet grinding, carrying out compared with grinding, having saved the energy to raw coal with adopting the mode of dry grinding in the slurrying of employing dry method.
In the above-described embodiments, in semicoke coal water slurry, the mass ratio of semi-coke powder and coal powder for slurry preparation is 1:9 ~ 1:1; Semicoke coal water slurry comprises water, and the mass percent that water accounts for semicoke coal water slurry is 30% ~ 40%.For example, when the mass ratio of semi-coke powder and coal powder for slurry preparation elects 1:9 as, through measuring, the slurry concentration of obtained semicoke coal water slurry is 65%; When the mass ratio of semi-coke powder and coal powder for slurry preparation elects 3:7 as, through measuring, the slurry concentration of obtained semicoke coal water slurry is 62%; When the mass ratio of semi-coke powder and coal powder for slurry preparation elects 1:1 as, through measuring, the slurry concentration of obtained semicoke coal water slurry is 60%.To sum up, when electing the mass ratio of semi-coke powder and coal powder for slurry preparation as 1:9 ~ 1:1, the slurry concentration of obtained semicoke coal water slurry is all more than or equal to 60%, satisfied requirement semicoke coal water slurry be delivered in semicoke coal water slurry gasification unit, and meets the feed needs of semicoke coal water slurry gasification unit.
In the above-described embodiments, the median size of semi-coke powder is 10 μm ~ 50 μm; The median size of coal powder for slurry preparation is 200 μm ~ 350 μm.By semicoke milling apparatus 21, semicoke is ground to the semi-coke powder that median size is 10 μm ~ 50 μm, when the median size because of semi-coke powder can be prevented to be greater than 50 μm, semi-coke powder hydrophobicity is comparatively strong and cause slurrying difficulty to increase, can prevent simultaneously the median size because of semi-coke powder be less than 10 μm and cause grinding semicoke time time lengthening; By pulverized coal grinding device 22, raw coal is ground to the coal powder for slurry preparation that median size is 200 μm ~ 350 μm, the coal powder for slurry preparation of this particle size range and median size are that the grating effect of the semi-coke powder of 10 μm ~ 50 μm is better, and are that the semi-coke powder of 10 μm ~ 50 μm mixes the semicoke coal water slurry obtained and has good mobility and stability by the coal powder for slurry preparation of this particle size range and median size.
When employing mode two prepares semicoke coal water slurry, because semicoke successively have passed through the grinding of semicoke milling apparatus 21 and wet grinding device 23, the median size of thus being carried out the semi-coke powder grinding acquisition by semicoke milling apparatus 21 pairs of semicokes can be greater than 50 μm.
It is worthy of note, the maximum particle diameter of coal powder for slurry preparation is preferably less than or equal to 1000 μm, with prevent the particle diameter because of coal powder for slurry preparation be greater than 1000 μm and reduce semicoke coal water slurry generation coal water slurry gasification reaction time speed of reaction and chemical conversion rate.
It is worth mentioning that, in the above-described embodiments, the median size of semi-coke powder is 10 μm ~ 50 μm; The median size of coal powder for slurry preparation is 200 μm ~ 350 μm, compared to coal powder for slurry preparation, semi-coke powder is a kind of ultrafine powder, when adopting the mode of dry method slurrying to prepare semicoke coal water slurry, when being ground by pulverized coal grinding device 22 pairs of raw coal, also can obtain the ultrafine powder that the median size of part particle diameter and semi-coke powder is suitable.In order to prevent the slurry concentration causing semicoke coal water slurry in the semicoke coal water slurry for preparing containing too much ultrafine powder, mobility and stability reduce, preferably, initial coal dust is obtained after being ground by pulverized coal grinding device 22 pairs of raw coal, initial coal dust is by two-time vibration sieve 27, elected by the rough coal dressing sieve of the maximum particle diameter (such as 1000 μm) during first time vibratory screening apparatus 27, particle diameter being greater than coal powder for slurry preparation, by the ultrafine powder of the median size of particle diameter and semi-coke powder quite (such as particle diameter is less than or equal to 45 μm) being screened during second time vibratory screening apparatus 27.When preparing semicoke coal water slurry, the coal powder for slurry preparation that the median size of semi-coke powder and particle diameter and semi-coke powder is suitable forms ultrafine powder, the mass percent that ultrafine powder accounts for the solid material of semicoke coal water slurry should be 50%, namely ultrafine powder accounts for 50% of the quality summation of semi-coke powder and coal powder for slurry preparation, to prevent from causing the slurry concentration of semicoke coal water slurry, mobility and stability all to decline containing too much ultrafine powder in semicoke coal water slurry.
In order to improve stability and the mobility of semicoke coal water slurry, in embodiments of the present invention, semicoke coal water slurry can also add additive, and the mass percent that additive accounts for semicoke coal water slurry is 0.2% ~ 2%.In semicoke coal water slurry, add additive, to prevent semicoke coal water slurry from producing precipitation in the process of conveying, and reduce the viscosity of semicoke coal water slurry, thus improve stability and the mobility of semicoke coal water slurry.In semicoke coal water slurry, add the additive of 0.2% ~ 2%, prevent because additive too much causes the preparation cost of semicoke coal water slurry to increase, while can prevent from causing because additive is very few to the stability of semicoke coal water slurry and the improvement effect of mobility poor.Additive can be naphthene sulfonic acid system additive.
Please continue to refer to Fig. 7, in embodiments of the present invention, semicoke coal water slurry gasification unit 30 comprises coal slurry gasifier 31 and after-treatment device, and wherein, coal slurry gasifier 31 and semicoke coal water slurry are prepared unit 20 and be communicated with; After-treatment device is communicated with coal hydrogenation gasification unit 10 with coal slurry gasifier 31 respectively; The char Gasification raw gas that semicoke coal water slurry obtains there is water-gas gasification reaction in coal slurry gasifier 31 after passes into after-treatment device, after after-treatment device aftertreatment, obtain hydrogen-containing product gas, hydrogen-containing product gas passes in coal hydrogenation gasification unit 10 and participates in coal hydrogenation gasification reaction.
Coal slurry gasifier 31 is provided with oxygen-containing gas inlet pipe, when semicoke coal water slurry carries out coal water slurry gasification reaction in coal slurry gasifier 31, in coal slurry gasifier 31, oxygen-containing gas is passed into by oxygen-containing gas inlet pipe, oxygen-containing gas is as combustion-supporting gas, assist the reaction of semicoke coal water slurry generation coal water slurry gasification, ensure temperature of reaction.
Please continue to refer to Fig. 7, after-treatment device comprises carbon monoxide conversion device 32 and product gas refining plant 33, coal slurry gasifier 31 is communicated with carbon monoxide conversion device 3,2 and product gas refining plant 33 successively, and product gas refining plant 33 is communicated with coal hydrogenation gasification unit 10; The char Gasification raw gas that semicoke coal water slurry obtains there is coal water slurry gasification reaction in coal slurry gasifier 31 after passes into carbon monoxide conversion device 32 and product gas refining plant 33 successively, obtain hydrogen-containing product gas, hydrogen-containing product gas passes in coal hydrogenation gasification unit 10 and participates in coal hydrogenation gasification reaction.The char Gasification raw gas that semicoke coal water slurry obtains there is coal water slurry gasification reaction in coal slurry gasifier 31 after mainly comprises carbon monoxide and hydrogen, the char Gasification raw gas obtained after semicoke coal water slurry is occurred in coal slurry gasifier 31 in coal water slurry gasification reaction passes in carbon monoxide conversion device 32, hydrogen is generated after making carbon monoxide generation CO shift reaction, char Gasification raw gas after CO shift reaction processes through product gas-cleaning installation 33, be unfavorable for that the gas that coal hydrogenation gasification reacts is removed by being present in the char Gasification raw gas after CO shift reaction, such as by a small amount of carbon monoxide in the char Gasification raw gas after CO shift reaction, the removals such as sulfurous gas.
Please continue to refer to Fig. 7, in the coal hydrogenation gasification system that the embodiment of the present invention provides, coal hydrogenation gasification unit 10 comprises the semicoke cooling dropping equipment 16 carrying out cooling step-down to the semicoke obtained after coal hydrogenation gasification reaction, and semicoke cooling dropping equipment 16 is prepared unit 20 with semicoke coal water slurry and is communicated with.The semicoke that coal hydrogenation gasification reaction obtains, after semicoke cooling dropping equipment 16 cools step-down, passes into semicoke coal water slurry and prepares in unit 20.The setting of semicoke cooling dropping equipment 16, coal hydrogenation gasification is made to react the semicoke cooling also step-down of acquisition, can prevent the temperature and pressure preparing the semicoke in unit 20 because being delivered to semicoke coal water slurry from causing slurrying difficulty to increase comparatively greatly, convenient preparation in unit 20 in semicoke coal water slurry carries out pulp making operations.
Please continue to refer to Fig. 2, coal hydrogenation gasification unit 10 comprises coal hydrogenation gasification stove 11 and gas-purification separation device, the raw gas outlet of coal hydrogenation gasification stove 11 is communicated with gas-purification separation device, coal hydrogenation gasification raw gas is also obtained after raw coal powder and hydrogeneous reactant gases carry out coal hydrogenation gasification reaction in coal hydrogenation gasification stove 11, coal hydrogenation gasification raw gas passes into gas-purification separation device, is passed in coal hydrogenation gasification stove 11 participate in coal hydrogenation gasification reaction by the hydrogeneous residual gas obtained after gas-purification separation device purification separation.
For example, gas-purification separation device comprises cleaning apparatus 12, heat-exchanger rig 13, oil product extraction element 14 and hydrogen separation device 15, the raw gas outlet of coal hydrogenation gasification stove 11 is communicated with cleaning apparatus 12, the cold side of heat-exchanger rig 13, oil product extraction element 14 and hydrogen separation device 15 successively, the outlet of the heat absorbing side of heat-exchanger rig 13 is communicated with coal hydrogenation gasification stove 11, and the entrance of the heat absorbing side of heat-exchanger rig 13 is communicated with hydrogen separation device 15 and semicoke coal water slurry gasification unit 30.
During concrete enforcement, raw coal powder and hydrogeneous reactant gases carry out coal hydrogenation gasification reaction in coal hydrogenation gasification stove 11, obtain the coal hydrogenation gasification raw gas containing light-end products (such as benzene, toluene, naphthalene etc.), methane and hydrogen, the coal hydrogenation gasification raw gas that coal hydrogenation gasification reaction obtains passes into cleaning apparatus 12, is fallen by the fine particle carbocoal filtering carried secretly by cleaning apparatus 12 in coal hydrogenation gasification raw gas, coal hydrogenation gasification raw gas after dedusting passes into the cold side of heat-exchanger rig 13, heat exchange is carried out with the gas in the heat absorbing side of heat-exchanger rig 13, preheating is carried out to the gas in heat absorbing side, make to reach about 600 DEG C by the temperature of the outlet expellant gas of heat absorbing side, the coal hydrogenation gasification raw gas that the coal hydrogenation gasification raw gas cooling formation temperature after dedusting reduces, the coal hydrogenation gasification raw gas that temperature reduces passes in oil product extraction element 14, and the light-end products in coal hydrogenation gasification raw gas temperature reduced by oil product extraction element 14 are extracted, the coal hydrogenation gasification raw gas extracted after light-end products passes in hydrogen separation device 15, be unfavorable for that gas delivery that coal hydrogenation gasification reacts out by hydrogen separation device 15 by extracting in the coal hydrogenation gasification raw gas after light-end products, obtain hydrogeneous residual gas, hydrogeneous residual gas passes into the heat absorbing side of heat-exchanger rig 13, coal hydrogenation gasification stove 11 is led to after heat exchange in heat-exchanger rig 13, as the unstripped gas of hydrogeneous reactant gases, participation coal hydrogenation gasification reacts, after the coal hydrogenation gasification raw gas after extraction light-end products being processed by hydrogen separation device 15, also obtain methane.Gas in the heat absorbing side of heat-exchanger rig 13 comprises the hydrogen-containing product gas exported by semicoke coal water slurry gasification unit 30, the hydrogeneous residual gas exported by hydrogen separation device 15 and extraneous hydrogen.
The coal hydrogenation gasification raw gas that coal hydrogenation gasification reaction obtains obtains hydrogeneous residual gas after gas-purification separation device process, hydrogeneous residual gas passes in coal hydrogenation gasification stove 11, participation coal hydrogenation gasification reacts, the efficient circulation achieving hydrogen utilizes, decrease the demand of coal hydrogenation gasification system external circle hydrogen, save cost.
Gas-purification separation device comprises heat-exchanger rig 13, coal hydrogenation gasification raw gas passes into the cold side of heat-exchanger rig 13, heat exchange is carried out with the gas in the heat absorbing side of heat-exchanger rig 13, preheating is carried out with the gas in the heat absorbing side of heat exchanging device 13, namely preheating is carried out to the hydrogeneous reactant gases participating in coal hydrogenation gasification reaction, in case stop-pass is lower and reduce the temperature of coal hydrogenation gasification reaction to the temperature of the hydrogeneous reactant gases in coal hydrogenation gasification stove 11.In addition, by arranging heat-exchanger rig 13, the preliminary heating device hydrogeneous reactant gases led in coal hydrogenation gasification stove 11 being carried out to preheating can be reduced, thus save the energy, and simplifying the structure of coal hydrogenation gasification system.
Semicoke coal water slurry gasification unit 30 is communicated with the entrance of the heat absorbing side of heat-exchanger rig 13, even if product gas refining plant 33 is communicated with the entrance of the heat absorbing side of heat-exchanger rig 13, transformationreation is there is in char Gasification raw gas in carbon monoxide conversion device 32, and after product gas-cleaning installation 33 processes, the hydrogen-containing product gas obtained passes into the heat absorbing side of heat-exchanger rig 13, and in heat-exchanger rig 13 with dedusting after the heat exchange of coal hydrogenation gasification raw gas after, lead to again in coal hydrogenation gasification stove, improve speed of reaction and the chemical conversion rate of coal hydrogenation gasification reaction.
It is worth mentioning that, extract the coal hydrogenation gasification raw gas after light-end products through oil product extraction element 14 and directly can pass into product gas refining plant 33 in semicoke coal water slurry gasification unit 30, pass in heat-exchanger rig 13 after product gas-cleaning installation 33 is purified, now, the setting of hydrogen separation device 15 can be cancelled.
In the above-described embodiments, the chilling device that the coal hydrogenation gasification raw gas obtained after coal hydrogenation gasification reaction is cooled is provided with in coal hydrogenation gasification stove 11.The coal hydrogenation gasification raw gas obtained after coal hydrogenation gasification reaction passes in gas-purification separation device after chilling device cooling.Chilling device is set in coal hydrogenation gasification stove 11, makes coal hydrogenation gasification react the coal hydrogenation gasification raw gas cooling of acquisition, at high temperature decompose to prevent the light-end products of the lightweight in coal hydrogenation gasification raw gas.
The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; change can be expected easily or replace, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of described claim.
Claims (17)
1. a coal hydrogenation gasification method, is characterized in that, comprising:
Coal hydrogenation gasification operation, raw coal powder and hydrogeneous reactant gases carry out coal hydrogenation gasification reaction in coal hydrogenation gasification unit, obtain semicoke;
Semicoke coal water slurry preparation section, semicoke coal water slurry is prepared unit and is utilized the semicoke obtained in described coal hydrogenation gasification operation to obtain semicoke coal water slurry;
Semicoke coal water slurry gasification operation, semicoke coal water slurry carries out coal water slurry gasification reaction in semicoke coal water slurry gasification unit, obtain char Gasification raw gas, char Gasification raw gas obtains hydrogen-containing product gas through aftertreatment, and hydrogen-containing product gas passes in described coal hydrogenation gasification unit and participates in coal hydrogenation gasification reaction.
2. coal hydrogenation gasification method according to claim 1, is characterized in that, semicoke coal water slurry comprises semi-coke powder and coal powder for slurry preparation, and described semicoke coal water slurry is prepared unit and comprised semicoke milling apparatus and pulverized coal grinding device, and described semicoke coal water slurry preparation section comprises:
Grinding steps, grind to form semi-coke powder to the semicoke obtained in described coal hydrogenation gasification operation by described semicoke milling apparatus, grind to form coal powder for slurry preparation to raw coal by described pulverized coal grinding device, the median size of coal powder for slurry preparation is greater than the median size of semi-coke powder;
Semicoke coal water slurry preparation process, mixes semi-coke powder, coal powder for slurry preparation and water, obtained semicoke coal water slurry.
3. coal hydrogenation gasification method according to claim 1, is characterized in that, semicoke coal water slurry comprises semi-coke powder and coal powder for slurry preparation, and described semicoke coal water slurry is prepared unit and comprised semicoke milling apparatus and wet grinding device, and described semicoke coal water slurry preparation section comprises:
Semicoke grinding steps, grinds to form semi-coke powder to the semicoke obtained in described coal hydrogenation gasification operation by described semicoke milling apparatus;
Semicoke water slurry preparation process, mixes semi-coke powder with water and stirs, obtained semicoke water slurry;
Semicoke coal water slurry preparation process, is ground semicoke water slurry, raw coal and water by described wet grinding device, forms semicoke coal water slurry.
4. the coal hydrogenation gasification method according to Claims 2 or 3, is characterized in that, in semicoke coal water slurry, the mass ratio of semi-coke powder and coal powder for slurry preparation is 1:9 ~ 1:1;
In semicoke coal water slurry, the mass percent that water accounts for semicoke coal water slurry is 30% ~ 40%.
5. the coal hydrogenation gasification method according to Claims 2 or 3, in semicoke coal water slurry, the median size of semi-coke powder is 10 μm ~ 50 μm; The median size of coal powder for slurry preparation is 200 μm ~ 350 μm.
6. coal hydrogenation gasification method according to claim 1, is characterized in that, semicoke coal water slurry also comprises additive, and the mass percent that additive accounts for semicoke coal water slurry is 0.2% ~ 2%.
7. coal hydrogenation gasification method according to claim 6, is characterized in that, additive is naphthene sulfonic acid system additive.
8. coal hydrogenation gasification method according to claim 1, is characterized in that, described semicoke coal water slurry gasification unit comprises coal slurry gasifier, after-treatment device, and described semicoke coal water slurry gasification operation comprises:
Semicoke coal water slurry gasification step, is placed in described coal slurry gasifier by semicoke coal water slurry, oxygen-containing gas, makes semicoke coal water slurry that coal water slurry gasification reaction occur in described coal slurry gasifier, obtains char Gasification raw gas;
Raw gas post-processing step, char Gasification raw gas is passed in described after-treatment device, described after-treatment device carries out aftertreatment to char Gasification raw gas, obtains hydrogen-containing product gas, and hydrogen-containing product gas passes in described coal hydrogenation gasification unit and participates in coal hydrogenation gasification reaction.
9. coal hydrogenation gasification method according to claim 1, it is characterized in that, described coal hydrogenation gasification unit comprises coal hydrogenation gasification stove, semicoke cooling dropping equipment and gas-purification separation device, wherein, be provided with coal gas chilling device in described coal hydrogenation gasification stove, described coal hydrogenation gasification operation comprises:
Raw coal powder and hydrogeneous reactant gases carry out coal hydrogenation gasification reaction in described coal hydrogenation gasification stove, obtain semicoke and coal hydrogenation gasification raw gas;
Carry out cooling step-down by described semicoke cooling dropping equipment to the semicoke that coal hydrogenation gasification reaction obtains, the semicoke after cooling step-down leads to described semicoke coal water slurry to be prepared in unit;
Coal hydrogenation gasification raw gas passes into described gas-purification separation device after described coal gas chilling device Quench, by described gas-purification separation device, purification separation is carried out to the coal hydrogenation gasification raw gas after described coal gas chilling device Quench, obtain hydrogeneous residual gas, hydrogeneous residual gas passes in described coal hydrogenation gasification stove and participates in coal hydrogenation gasification reaction.
10. a coal hydrogenation gasification system, is characterized in that, comprises coal hydrogenation gasification unit, semicoke coal water slurry prepares unit and semicoke coal water slurry gasification unit; Wherein,
Described coal hydrogenation gasification unit is used for making raw coal powder and hydrogeneous reactant gases carry out coal hydrogenation gasification reaction, obtains semicoke;
Described semicoke coal water slurry is prepared unit and is communicated with described coal hydrogenation gasification unit, and described semicoke coal water slurry is prepared unit and utilized the semicoke exported by described coal hydrogenation gasification unit to obtain semicoke coal water slurry;
Described semicoke coal water slurry gasification unit is prepared unit with described semicoke coal water slurry respectively and is communicated with described coal hydrogenation gasification unit, coal water slurry gasification reaction is carried out for making the semicoke coal water slurry being prepared unit output by described semicoke coal water slurry, obtain char Gasification raw gas, carry out aftertreatment to char Gasification raw gas and obtain hydrogen-containing product gas, hydrogen-containing product gas passes in described coal hydrogenation gasification unit and participates in coal hydrogenation gasification reaction.
11. coal hydrogenation gasification systems according to claim 10, it is characterized in that, described semicoke coal water slurry is prepared unit and is comprised: the semicoke milling apparatus grinding to obtain the semi-coke powder of less median size to semicoke, and pulverized coal grinding device raw coal being ground to the coal powder for slurry preparation obtaining larger median size.
12. coal hydrogenation gasification systems according to claim 10, it is characterized in that, described semicoke coal water slurry is prepared unit and is comprised: grind to semicoke the semicoke milling apparatus obtaining semi-coke powder, and grinds to semi-coke powder, water and raw coal the wet grinding device obtaining semicoke coal water slurry simultaneously.
13. coal hydrogenation gasification systems according to claim 10, is characterized in that, described semicoke coal water slurry gasification unit comprises coal slurry gasifier and after-treatment device, and wherein, described coal slurry gasifier is prepared unit with described semicoke coal water slurry and is communicated with; Described after-treatment device is communicated with described coal hydrogenation gasification unit with described semicoke coal slurry gasifier respectively; The char Gasification raw gas that semicoke coal water slurry obtains there is coal water slurry gasification reaction in described coal slurry gasifier after passes into described after-treatment device, after described after-treatment device aftertreatment, obtain hydrogen-containing product gas, hydrogen-containing product gas passes in described coal hydrogenation gasification unit and participates in coal hydrogenation gasification reaction.
14. coal hydrogenation gasification systems according to claim 13, it is characterized in that, described after-treatment device comprises carbon monoxide conversion device and product gas refining plant, described coal slurry gasifier is communicated with described carbon monoxide conversion device and described product gas refining plant successively, and described product gas refining plant is communicated with described coal hydrogenation gasification unit; The char Gasification raw gas that semicoke coal water slurry obtains there is coal water slurry gasification reaction in described coal slurry gasifier after passes into described carbon monoxide conversion device and described product gas refining plant successively, obtain hydrogen-containing product gas, hydrogen-containing product gas passes in described coal hydrogenation gasification unit and participates in coal hydrogenation gasification reaction.
15. coal hydrogenation gasification systems according to claim 10, it is characterized in that, described coal hydrogenation gasification unit comprises the semicoke cooling dropping equipment carrying out cooling step-down to the semicoke obtained after coal hydrogenation gasification reaction, and described semicoke cooling dropping equipment is prepared unit with described semicoke coal water slurry and is communicated with.
16. coal hydrogenation gasification systems according to claim 10, it is characterized in that, described coal hydrogenation gasification unit comprises coal hydrogenation gasification stove and gas-purification separation device, the raw gas outlet of described coal hydrogenation gasification stove is communicated with described gas-purification separation device, coal hydrogenation gasification raw gas is also obtained after raw coal powder and hydrogeneous reactant gases carry out coal hydrogenation gasification reaction in described coal hydrogenation gasification stove, coal hydrogenation gasification raw gas passes into described gas-purification separation device, passed in described coal hydrogenation gasification stove by the hydrogeneous residual gas obtained after described gas-purification separation device purification separation and participate in coal hydrogenation gasification reaction.
17. coal hydrogenation gasification systems according to claim 16, is characterized in that, are provided with the chilling device cooled the coal hydrogenation gasification raw gas obtained after coal hydrogenation gasification reaction in described coal hydrogenation gasification stove.
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| CN108048119A (en) * | 2017-11-16 | 2018-05-18 | 北京神雾电力科技有限公司 | High temperature coke powder processing system and method under pyrolysis oven cyclone dust collectors |
| CN110055116A (en) * | 2018-10-09 | 2019-07-26 | 新能能源有限公司 | Hydrogasification semicoke pulping process |
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