CN106590708A - Low-temperature pulverized coal carbonization process - Google Patents
Low-temperature pulverized coal carbonization process Download PDFInfo
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- CN106590708A CN106590708A CN201610649972.2A CN201610649972A CN106590708A CN 106590708 A CN106590708 A CN 106590708A CN 201610649972 A CN201610649972 A CN 201610649972A CN 106590708 A CN106590708 A CN 106590708A
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- gas
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- semicoke
- jing
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Classifications
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B53/00—Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form
- C10B53/04—Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form of powdered coal
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B27/00—Arrangements for withdrawal of the distillation gases
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10K—PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
- C10K1/00—Purifying combustible gases containing carbon monoxide
- C10K1/002—Removal of contaminants
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10K—PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
- C10K1/00—Purifying combustible gases containing carbon monoxide
- C10K1/02—Dust removal
- C10K1/026—Dust removal by centrifugal forces
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10K—PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
- C10K1/00—Purifying combustible gases containing carbon monoxide
- C10K1/04—Purifying combustible gases containing carbon monoxide by cooling to condense non-gaseous materials
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10K—PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
- C10K1/00—Purifying combustible gases containing carbon monoxide
- C10K1/04—Purifying combustible gases containing carbon monoxide by cooling to condense non-gaseous materials
- C10K1/046—Reducing the tar content
Abstract
The invention discloses a low-temperature pulverized coal carbonization process. The low-temperature pulverized coal carbonization process comprises the following steps that after the moisture content of pulverized coal of below 30 mm is reduced through a dryer, the pulverized coal is fed into a pre-heater to exchange heat with hot raw coke oven gas from a dry distillation furnace and then is heated and fed into the dry distillation furnace; the raw coke oven gas cooled by the pre-heater further undergoes dust removal through a dust removal device built in the pre-heater and then passes through a combined wet dust removal device, an intercooler and an electrical tar precipitator, and then coal tar and coal gas are produced; the circulated coal gas is preheated by a semi-coke cooler and then enters a hot-blast stove or a coal gas heater to heated into heat-carrying coal gas, the heat-carrying coal gas performs heat exchange with pulverized coal on a fluidized bed in the furnace through an air chamber of the dry distillation furnace and an air cap, the pulverized coal is heated to produce pyrolysis or dry distillation, and low-temperature dry distillation is conducted on the pulverized coal to produce semi-coke and hot raw coke oven gas; the semi-coke enters the semi-coke cooler to be cooled and discharged out, and the hot raw coke oven gas enters a furnace outlet separator for preliminary dust fall and then enters the pre-heater. By the adoption of the process, quality improvement and graded utilization of low-order pulverized coal are achieved, and efficient and clean utilization of coal resources is achieved.
Description
Technical field
The invention belongs to coal chemical industry technical field, it is related to a kind of pyrolysis of low order fine coal, distillation system, more particularly to one
Plant low order fine coal low temperature distillation technique.
Background technology
China is coal resources big country, and coal is not only a kind of industrial chemicals, and accounting is very big in China's energy resource structure.
China's low order coal reserves is larger, accounts for more than the 42% of whole coals, is the quality raw materials of low temperature distillation.The 90% of current these coals
For directly burning.By low temperature distillation make hydrogen-rich portion of product in coal with high-quality liquid and the gaseous energy or industrial chemicals
Output, the semicoke of output is also a kind of clean fuel.Fine coal output accounting more than 70% in coal production, so entering to low price coal
Row pyrolysis or dry distilling can effectively utilize resource, can also substantially reduce the environmental pollution caused to air because of fire coal.For this China
The clean utilization of coal, the upgrading of low-order coal and classified utilization are put on the agenda to come in 13 planning.
The dry distilling of coal：It is that coal is heated to uniform temperature in the state of starvation by coal, it may occur that a series of change
Change, so as to realize effective conversion of coal.The dry distilling of coal is divided into by the final temperature difference of heating：900-1100 DEG C be high-temperature retorting,
700-900 DEG C be medium temperature carbonization, 500-600 DEG C be low temperature distillation.Output semicoke, coal gas and Jiao in coal, after low temperature distillation
Oily three kinds of products, coal gas and tar are the higher industrial chemicals of added value, and it is clear that semicoke can be even more one kind as other industrial chemicals
Clean power fuel.
China, in low-order coal, in low temperature distillation industrialized production, is the fast coal conduct for being more than 30mm to granularity at present
Being produced, semicoke is used for metallurgical, chemical industry as raw material to raw material.The low temperature distillation of a large amount of fine coal in low-rank coal yield
Due to the limitation of the aspects such as technique, technology, so far cannot industrialized production.
Coal at Low Temperature dry distilling main technique is divided into by heat exchange method：Internal heat type and two kinds of main Types of external-heat.Specifically
For, internal heat type refers to during coal low temperature distillation directly contact between feed coal and thermal medium, and thermaltransmission mode is
Conduction, radiation, convection current are present simultaneously, and the thermal efficiency is very high, and which can be classified as air heat again according to the different of heat-carrying agent medium
Carrier and solid thermophore two types.And external-heat be then be do not exist between thermal medium and feed coal during heating
Directly contact, thermaltransmission mode is only conduction, and its heating institute calorific requirement is conducted by furnace wall, and the thermal efficiency is relatively low.
Low order pulverized coal pyrolysis, low temperature distillation technique typical case are being tested by China：External heating has drum-type rotary kiln to add
The techniques such as hot continuous carbonization, quirk indirectly heat dry distilling；Synthesis by internal resistance electric melting has heat-carrying gas heating, the heating of solid thermophore or mixes
The techniques such as heating.Its main technique is：
External-heat drum-type rotary kiln dry distilling is that heat smoke is entered in the monolayer rotary kiln equipped with fine coal, and fine coal is carried out adding
Take the coal dust less than 0.2mm during baking the affected part after applying some drugs are dry simultaneously out of, the coal after drying more than 0.2mm is sent in Double layer rotating kiln
Low temperature side in cylinder.Fuel or heat smoke transfer heat to the coal in inner core into body wall in interlayer Jing between inner/outer tube, are allowed to add
Heat, dry distilling, semicoke are discharged into semicoke cooling system from high temperature side in the inner core of Double layer rotating kiln, and the raw coke oven gas of generation is from bilayer
In the inner core of rotary kiln, low temperature side is discharged into dedusting, purification cleaning system.This technique output semicoke steady quality, coal gas compared with
It is pure, but the coal dust less than 0.2mm is not utilized in a large number, and intractability is big；Rotary drum shafting sealing problem directly affects device
Maximization develops the coal dust that the friction of coal grain is produced in rotary drum simultaneously and is taken away by raw coke oven gas, and raw coke oven gas dust-laden is larger；Rotation rolling
The problems such as usage cycles of cylinder inner core is the big problem for affecting the process industry.
The techniques such as external-heat quirk indirectly heat dry distilling are that flat, the perpendicular quirk that will be distributed over carbonizing chamber periphery by fuel adds
Heat, heat Jing furnace walls are conducted to the indoor fine coal of carbonization and are allowed to dry distilling.The technique in coal high-temperature retorting, (give birth to by metallurgical coke
Produce) in commonly use, the low temperature distillation for coal is temperature required relatively low, and carbonization interior fine coal may be made to be heated irregular, semicoke quality
Cannot ensure, each of which carbonizing chamber is all interval input and output material in addition, just continuously can be produced after only multiple carbonizing chambers are arranged side by side.
Internal heat type solid thermal carriers heating technique is to be heated to after 800-900 DEG C and the fine coal after drying porcelain ball or fine coal
Mixing is allowed to dry distilling.The technique causes system coking and blocking solve so far because of raw coke oven gas coal dust and analysis carbon phenomenon.
Internal heat type heat-carrying gas heating is that lump coal is heated in upright carbide furnace by heat-carrying coal gas by quirk Jing nozzles
And low temperature distillation is carried out, the technique is mature on the whole, is gone in the area such as the Yulin of China, the Inner Mongol, Gansu, Xinjiang
Industry size.The technique simply carries out low temperature distillation to the lump coal more than 20mm of accounting 20-30% in coal production, it is impossible to real
Low temperature distillation is carried out to the fine coal of accounting 70-80% in coal production now.
Fine coal low temperature distillation problems of the prior art mainly have：One is that fine coal does not have permeability, does not solve its
Permeability cannot just realize the problem of the thermally equivalent of fine coal；Two is that the raw coke oven gas composition that fine coal low temperature distillation is produced is very complicated,
It is made up of coal dust, coal gas, tar gas, steam and some unstable gases, with temperature change, its composition also changes.According to
Relevant discussion and practice have shown that coal tar dew point be 80 DEG C, raw gas temperature be less than 380 DEG C when will occur analyse carbon phenomenon, temperature
When degree is higher than 380 DEG C, existing cleaner cannot be used, and reach the temperature that cleaner can bear less than 380 DEG C, in raw coke oven gas
The mixture such as coal dust, analysis carbon, tar make system jams, coking run well.So existing fine coal low temperature distillation technology
Resit an exam, it is naturally few from the aspect of other.
The content of the invention
For problem present in above-mentioned existing fine coal low temperature distillation technology, the present invention is using fine coal retort process dedusting
The theory of system and combine it is own for solve the above problems device, to develop purpose on the basis of facility be to provide a kind of
Fine coal low temperature distillation technique.
Realize that foregoing invention purpose technical approach is a kind of fine coal low temperature distillation technique.Canopy.
Above-mentioned fine coal low temperature distillation technique, it is characterised in that the heat-carrying coal gas is by heat-carrying after gas retort system start-up
Preheating gas are heated to 950 DEG C by gas heater, and the fuel of heating according to circumstances voluntarily can be selected, and start Posterior circle coal
Or else be mixed into exhaust combustion gases in gas, circulating gas Jing residual gas are gradually discharged and calorific value are replaced into up to the pure coal of 4000 kilocalories
Gas, improves the value of coal gas；Exhaust combustion gases for heat-carrying gas heater deliver to baker drying raw coal.
Originally a purpose has been returned and has been to provide a kind of outer fine coal low temperature distillation technique, comprised the following steps：
1) the colliery fine coal Jing ribbon conveyers of below 30mm are sent in half-open flue baker, in 300 DEG C of heat smokes
Under conditions of carry out drying 48h, make fine coal temperature reach 80 DEG C, water content be less than 5%；
2) fine coal after drying enters preheater；Fine coal and the gas retort that moisture is reduced in preheater out Jing cyclonic separations
500 DEG C of raw coke oven gas after device dedusting carry out heat exchange 2h, make raw gas temperature be reduced to 80～150 DEG C, and fine coal temperature brings up to
350℃.Dirt Jing material blanking tube of the raw coke oven gas Jing cyclone separator except under drops down onto semicoke cooler, in semicoke finished product；Preheater
Internal dust arrester is fallen in preheater in fine coal, carries out dry distilling into system material.
3) the built-in further dedusting of dust arrester of the preheated device of raw coke oven gas after the cooling of preheated device, again combined formula are wet
After dedusting after method dust arrester, washing oil, gas temperature is down to 890 DEG C, then sequentially passes through inter cooler, electrical tar precipitator purification, cold
But it is changed into 60 DEG C of cooled coal gas after processing, using to circulate cooled coal gas, remainder is used for other to a part of cooled coal gas system circulation
Allied industry；Used in the dirt slag that combination type Wet-way dust-collector is removed is pulled out and is admixed coal, oil-water mixture and from inter cooler,
After electrical tar precipitator profit unification out is processed into oily-water seperating equipment, tar enters tar tank as product, and ammonia enters
After entering ammonia water tank, a part is used for providing source of recycled water to combination type Wet-way dust-collector, and remainder ammonia delivers to ammonia
Processing system；
4) fine coal of preheated device preheating continuously enters gas retort by feeder；The preheating of Jing semicoke coolers epimere preheating
Coal gas is partly into burner and the heat-carrying coal gas that remaining circulating gas is heated to 750～950 DEG C is entered dry with air burning
In furnace, air compartment Jing blast caps carry out heat exchange 30 minutes with the fine coal on ebullated bed in stove, and fine coal is heated to 650 DEG C carries out heat
Solution or dry distilling, produce the hot raw coke oven gas of semicoke and 500-600 DEG C；
5) 500-600 DEG C of hot raw coke oven gas enters preheater Jing after the cyclone separator rough dusting of outlet of still, circulates cold
Coal gas sends into indirect type semicoke cooler epimere Jing after with hot semicoke heat exchange, semicoke temperature is reduced while will also circulate cold coal
Gas is heated to 350 DEG C of preheating gas, and coal dust falls into semicoke cooler；
6) 650 DEG C of semicoke enters indirect type semicoke cooler from the overflow pipe of gas retort, on indirect type semicoke cooler
Section makes semicoke temperature be down to 120 DEG C, continuously by the cooled coal gas cooling of circulation cooled coal gas, the circulating water in hypomere Jing hosepipes
Storage Jiao Peng is delivered to by discharging device for coke Jing ribbon conveyers.
Compared with prior art, the present invention has advantages below：
1) in each link of low temperature distillation, more than 99% coal dust is removed in each apparatus system, while will be the coal dust removed straight
Connecing in being mixed into the fine coal of each system carries out dry distilling, while raw gas temperature is down to the metastable interval of its composition, raw coke oven gas
In make tar, coal gas dust content up to standard after the combined formula Wet-way dust-collector of coal dust less than 1%, solve raw coke oven gas coking and blocking
The phenomenon of system, realizes the safe and stable operation of fine coal low-temperature carbonization system.
2) technique carries out low temperature distillation to preheating fine coal heating using internal heat type heat-carrying coal gas fluidized bed process, is adding fine coal
It is heated evenly in thermal process, temperature-controllable, realizes semicoke quality height and stablize.
3) hot raw coke oven gas is used to preheat fine coal by technique preheater using half-open flue baker, using Semi-coke cooling device
Circulation cooled coal gas is preheated, is made system material sensible heat be utilized effectively, is realized efficient, the energy-conservation of process system.
Fine coal low temperature distillation technique of the present invention is mostly directly burnt mainly for low order fine coal, is not only the waste of resource,
And be the one of the main reasons for causing environmental pollution, using circulation heat-carrying coal gas pyrolytic technique and cooled coal gas and the indirect quenching of water
CDQ technique.Experiment and demonstration will be carried out on the basis of original circulation heat-carrying coal gas pyrolytic technique test simultaneously, be advanced
Energy-conserving and environment-protective scientific and technological achievement applications, build energy-conserving and environment-protective advanced technology research and development bases, and enterprise is in energy-conserving and environment-protective field
The capability of independent innovation, propulsion China derived energy chemical industry health, fast development, to promoting industry restructuring and optimization, industry
Chain extension plays positive role.
Description of the drawings
Fig. 1 is the flow chart of the first embodiment of fine coal low temperature distillation technique of the present invention.
Fig. 2 is the flow chart of second embodiment of fine coal low temperature distillation technique of the present invention.
Specific embodiment
The specific embodiment be given below by way of inventor is further illustrating fine coal drying of the present invention, dry distilling and quenching
The beneficial effect of technique.
A kind of 1 fine coal low temperature distillation technique (referring to Fig. 1) of embodiment, comprises the following steps：
1) the colliery fine coal Jing ribbon conveyers of below 30mm are sent in baker, under conditions of 250 DEG C of heat smokes
Carry out drying 8h, make fine coal temperature reach 80 DEG C, water content be less than 5%；
2) fine coal after drying enters preheater；Out separated device divides the fine coal that moisture is reduced in preheater with gas retort
600 DEG C of raw coke oven gas after carry out heat exchange 12h, make raw gas temperature be reduced to 80 DEG C, and fine coal temperature brings up to 400 DEG C；
3) the built-in further dedusting of dust arrester of the preheated device of raw coke oven gas after the cooling of preheated device, again combined formula are wet
After dedusting after method dust arrester, washing oil, gas temperature is down to 80 DEG C, then sequentially passes through inter cooler, electrical tar precipitator purification, cooling
It is changed into 60 DEG C of cooled coal gas after process, a part of cooled coal gas system circulation using to circulate cooled coal gas, match somebody with somebody for other by remainder
Set industry；Used in the dirt slag that combination type Wet-way dust-collector is removed is pulled out and is admixed coal, oil-water mixture and from inter cooler, electricity
The profit unification out of tar device is caught into after oily-water seperating equipment process, tar enters tar tank as product, and ammonia is entered
After ammonia water tank, a part is used for providing source of recycled water to combination type Wet-way dust-collector, and remainder ammonia is delivered at ammonia
Reason system；
4) fine coal of preheated device preheating continuously enters gas retort by feeder；The preheating of Jing semicoke coolers epimere preheating
Coal gas Jing heat-carrying gas heaters are heated to 750 DEG C of heat-carrying coal gas on ebullated bed in air compartment Jing blast caps in gas retort and stove
Fine coal carry out heat exchange 60 minutes, fine coal is heated to into 650 DEG C and is pyrolyzed or dry distilling, the heat for producing semicoke and 500 DEG C is waste
Coal gas；
5) 500 DEG C of hot raw coke oven gas enters preheater Jing after the cyclone separator rough dusting of outlet of still, circulates cooled coal gas
Indirect type semicoke cooler epimere is sent into Jing after with hot semicoke heat exchange, reduces semicoke temperature while also adding circulation cooled coal gas
The preheating gas of heat to 350 DEG C, coal dust fall into semicoke cooler；
6) 650 DEG C of semicoke enters indirect type semicoke cooler from the overflow pipe of gas retort, on indirect type semicoke cooler
Section makes semicoke temperature be down to 120 DEG C, continuously by the cooled coal gas cooling of circulation cooled coal gas, the circulating water in hypomere Jing hosepipes
Storage Jiao Peng is delivered to by discharging device for coke Jing ribbon conveyers.
A kind of 2 fine coal low temperature distillation technique (referring to Fig. 2) of embodiment, comprises the following steps：
1) the colliery fine coal Jing ribbon conveyers of below 30mm are sent in baker, under conditions of 300 DEG C of heat smokes
Carry out drying 4, make fine coal temperature reach 60 DEG C, water content be less than 5%；
2) fine coal after drying enters preheater；Out separated device divides the fine coal that moisture is reduced in preheater with gas retort
600 DEG C of raw coke oven gas after carry out heat exchange 8, make raw gas temperature be reduced to 150 DEG C, and fine coal temperature brings up to 350 DEG C；
3) the further dedusting of the preheated device exit dust control device of raw coke oven gas after the cooling of preheated device, again combined formula wet method
After dedusting after dust arrester, washing oil, gas temperature is down to 90 DEG C, then sequentially pass through inter cooler, electrical tar precipitator purification, at cooling
It is changed into 20 DEG C of cooled coal gas after reason, using to circulate cooled coal gas, it is supporting that remainder is used for other to a part of cooled coal gas system circulation
Industry；Used in the dirt slag that combination type Wet-way dust-collector is removed is pulled out and is admixed coal, oil-water mixture and from inter cooler, electric fishing
After the profit unification out of tar device is processed into oily-water seperating equipment, tar enters tar tank as product, and ammonia enters ammonia
After water pot, a part is used for providing source of recycled water to combination type Wet-way dust-collector, and remainder ammonia delivers to ammonia treatment
System；
4) fine coal of preheated device preheating continuously enters gas retort by feeder；The preheating of Jing semicoke coolers epimere preheating
Coal gas is partly into burner and the heat-carrying coal gas that remaining circulating gas is heated to 950 DEG C is entered in gas retort with air burning
Air compartment Jing blast caps carry out heat exchange 300 minutes with the fine coal on ebullated bed in stove, fine coal is heated to 650 DEG C and is pyrolyzed or is done
Evaporate, produce the hot raw coke oven gas of semicoke and 600 DEG C；
5) 600 DEG C of hot raw coke oven gas enters preheater Jing after the cyclone separator rough dusting of outlet of still, circulates cooled coal gas
Indirect type semicoke cooler epimere is sent into Jing after with hot semicoke heat exchange, reduces semicoke temperature while also adding circulation cooled coal gas
The preheating gas of heat to 350 DEG C, coal dust fall into semicoke cooler；
6) 550 DEG C of semicoke enters indirect type semicoke cooler from the overflow pipe of gas retort, on indirect type semicoke cooler
Section makes semicoke temperature be down to 80 DEG C by circulation cooled coal gas cooled coal gas cooling, the circulating water in hypomere Jing hosepipes, continuously by
Discharging device for coke Jing ribbon conveyers are delivered to storage Jiao Peng.
Test example 1
1 experiment and demonstration device technique technical advance is analyzed
(1) pyrolytic process technical advance
China's coal-mine mechanical mining degree is higher at present, and lump coal only accounts for 20%～25%, block raw coal price
Comparison is high, and substantial amounts of low order fine coal cannot be integrated into utilizing, and can only directly burn as thermal coal, not only pollute environment,
Also create the waste of resource.This experiment and demonstration device can solve pulverized coal pyrolysis using circulation heat-carrying coal gas ebullated bed pyrolytic process
Middle heating temperature is irregular, and dedusting is unable to effectively solving, the problems such as system easy coking and blocking, with other fine coal low temperature distillation techniques and
Conventional upright stove low temperature distillation is compared, and its feature is shown in Table 1.
The fine coal low temperature distillation technique of 1 present invention of table and other fine coal low temperature distillation techniques and conventional upright stove low temperature distillation
Comparison of technology catalog
(2) extinguishing technique technical advance
Most of coal chemical enterprises all adopt traditional wet quenching technology at present, the side of the hot semicoke water spray that will be come out of the stove
Formula quenching.This quenching mode not only makes the sensible heat that hot semicoke is carried reclaim, and causes energy serious waste, and in quenching
During produce substantial amounts of containing phenol, cyanogen, ammonia, the waste water of sulfide, waste gas, the dust, chemical pollutant in waste gas, it is drift extremely
It is tens of inside and outside, atmospheric pollution is very serious；
Using cooled coal gas and water united CDQ indirectly, it is cold that the sensible heat of semicoke more than 70% is conducted to circulation to the present invention
Coal gas, its concrete quenching feature are shown in Table 2.
2 dry method of table and wet quenching Technical comparing catalog
The present invention adopts cooled coal gas and a water receiving that semicoke temperature is down to room temperature in the equipment of closing, reduces to environment
Pollution, and red burnt Exposure degree is utilized, energy-saving effect is obvious.
The difference of two schemes of the present invention is：
The characteristics of scheme 1 is that the heat-carrying coal gas is by preheating gas by heat-carrying gas heater after gas retort system start-up
750-950 DEG C is heated to, the fuel of heating according to circumstances voluntarily can be selected, in starting Posterior circle coal gas, is or else mixed into fuel
Waste gas, gradually discharging and being replaced into calorific value up to the scrubbed gas of 4000 kilocalories for circulating gas Jing residual gas, improves coal gas
Value.This programme increases a heat-carrying gas heater in systems, increases project investment, for by coal gas be used as change
The project of work raw material should select this scheme.This programme combines interior-heat, the advantage of two kinds of dry distilling modes of exterior-heat；For heat-carrying coal gas
The exhaust combustion gases of heater deliver to baker drying raw coal.
After the characteristics of scheme 2 is gas retort system start-up, the heat-carrying coal gas is to be partly into burning by preheating gas
Remaining circulating gas is heated to 750-950 DEG C by device and air burning, and the fuel of heating is coal gas, and exhaust combustion gases are directly entered
In heat-carrying coal gas, the calorific value of residual gas is only 1500-1800 kilocalories.This programme is not provided with heat-carrying gas heater in system,
Reduce investment.This scheme may be selected for coal gas is directly used as power fuel project.But the heat smoke of raw coal drying is needed
It is another to provide with air stove.
The difference of two schemes of the present invention is whether to arrange heat-carrying gas heater, directly affects the matter of output coal gas
Amount.
Claims (4)
1. a kind of fine coal low temperature distillation technique, it is characterised in that comprise the following steps：
1) the colliery fine coal Jing ribbon conveyers of below 30mm are sent in baker, under conditions of 250～300 DEG C of heat smokes
Carry out 4～8h of drying, make fine coal temperature reach 60～80 DEG C, water content be less than 5%；
2) fine coal after drying enters preheater；Out separated device tentatively drops the fine coal that moisture is reduced in preheater with gas retort
500～600 DEG C of raw coke oven gas after dirt carry out 8～12h of heat exchange, make raw gas temperature be reduced to 80～150 DEG C, and fine coal temperature is carried
Height is to 350～400 DEG C；
3) the built-in further dedusting of dust arrester of the preheated device of raw coke oven gas after the cooling of preheated device, again combined formula wet method are removed
After dedusting after dirt device, washing oil, gas temperature is down to 80～90 DEG C, then sequentially passes through inter cooler, electrical tar precipitator purification, cooling
It is changed into 20-60 DEG C of cooled coal gas after process, a part of cooled coal gas enters system circulation using to circulate cooled coal gas, and remainder is used for
Other allied industries；Used in the dirt slag that combination type Wet-way dust-collector is removed is pulled out and is admixed coal, oil-water mixture and from
Into oily-water seperating equipment process, tar enters tar tank, ammonia as product to the profit unification out of cooler, electrical tar precipitator
Into after ammonia water tank, a part is used for providing source of recycled water to combination type Wet-way dust-collector, and remainder ammonia delivers to ammonia
Water treatment system；
4) preheated device is preheated to 300～400 DEG C of fine coal and is continuously introduced into gas retort by feeder and is heated to 550～650 DEG C
Row pyrolysis or dry distilling, produce 550～650 DEG C of hot semicoke and 500～600 DEG C of hot raw coke oven gas；
5) 500～600 DEG C of hot raw coke oven gas enters preheater Jing after the cyclone separator rough dusting of outlet of still, circulates cooled coal gas
Indirect type semicoke cooler epimere is sent into Jing after with hot semicoke heat exchange, reduces semicoke temperature while also adding circulation cooled coal gas
The preheating gas of heat to 200～350 DEG C, coal dust fall into semicoke cooler；
6) 550～650 DEG C of semicoke enters indirect type semicoke cooler from the overflow pipe of gas retort, on indirect type semicoke cooler
Section makes semicoke temperature be down to room temperature by circulation cooled coal gas cooled coal gas cooling, the circulating water in hypomere Jing hosepipes, continuously by
Discharging device for coke Jing ribbon conveyers are delivered to storage Jiao Peng.
7) circulating gas Jing semicokes cooler is preheated to 150--350 DEG C of preheating gas, and Jing gas heaters are heated to 750～
950 DEG C become heat-carrying coal gas, and heat-carrying coal gas carries out heat exchange with the fine coal on ebullated bed in stove by air compartment Jing blast caps in gas retort
30～60 minutes, fine coal is heated to into 550～650 DEG C and is pyrolyzed or low temperature distillation.
2. fine coal low temperature distillation technique according to claim 1, it is characterised in that the heat-carrying after gas retort system start-up
Coal gas is that preheating gas are heated to 750～950 DEG C by heat-carrying gas heater, and the fuel of heating can according to circumstances voluntarily
Select, start Posterior circle coal gas in be or else mixed into exhaust combustion gases, the gradually discharge of circulating gas Jing residual gas and be replaced into heat
It is worth the scrubbed gas up to 4000 kilocalories, the exhaust combustion gases for heat-carrying gas heater deliver to baker drying raw coal.
3. a kind of fine coal low temperature distillation technique, it is characterised in that comprise the following steps：
1) the colliery fine coal Jing ribbon conveyers of below 30mm are sent in baker, under conditions of 250～300 DEG C of heat smokes
Carry out 4～8h of drying, make fine coal temperature reach 60～80 DEG C, water content be less than 5%；
2) fine coal after drying enters preheater；Out separated device tentatively drops the fine coal that moisture is reduced in preheater with gas retort
500～600 DEG C of raw coke oven gas after dirt carry out 8～12h of heat exchange, make raw gas temperature be reduced to 80～150 DEG C, and fine coal temperature is carried
Height is to 350～400 DEG C；
3) the built-in further dedusting of dust arrester of the preheated device of raw coke oven gas after the cooling of preheated device, again combined formula wet method are removed
After dedusting after dirt device, washing oil, gas temperature is down to 80～90 DEG C, then sequentially passes through inter cooler, electrical tar precipitator purification, cooling
It is changed into 20-60 DEG C of cooled coal gas after process, a part of cooled coal gas enters system circulation using to circulate cooled coal gas, and remainder is used for
Other allied industries；Used in the dirt slag that combination type Wet-way dust-collector is removed is pulled out and is admixed coal, oil-water mixture and from
Into oily-water seperating equipment process, tar enters tar tank, ammonia as product to the profit unification out of cooler, electrical tar precipitator
Into after ammonia water tank, a part is used for providing source of recycled water to combination type Wet-way dust-collector, and remainder ammonia delivers to ammonia
Water treatment system；
4) preheated device is preheated to 300～400 DEG C of fine coal and is continuously introduced into gas retort by feeder and is heated to 550～650 DEG C
Row pyrolysis or dry distilling, produce 550～650 DEG C of hot semicoke and 500～600 DEG C of hot raw coke oven gas；
5) 500～600 DEG C of hot raw coke oven gas enters preheater Jing after the cyclone separator rough dusting of outlet of still, circulates cooled coal gas
Indirect type semicoke cooler epimere is sent into Jing after with hot semicoke heat exchange, reduces semicoke temperature while also adding circulation cooled coal gas
The preheating gas of heat to 200～350 DEG C, coal dust fall into semicoke cooler；
6) 550～650 DEG C of semicoke enters indirect type semicoke cooler from the overflow pipe of gas retort, on indirect type semicoke cooler
Section makes semicoke temperature be down to room temperature by circulation cooled coal gas cooled coal gas cooling, the circulating water in hypomere Jing hosepipes, continuously by
Discharging device for coke Jing ribbon conveyers are delivered to storage Jiao Peng.
7) circulating gas Jing semicokes cooler is preheated to 150--350 DEG C of preheating gas, and preheating gas are partly into burner
Remaining circulating gas is heated to 750～950 DEG C with air burning becomes heat-carrying coal gas, and heat-carrying coal gas is by air compartment Jing in gas retort
Fine coal in blast cap and stove on ebullated bed carries out heat exchange 30～60 minutes, by fine coal be heated to 550～650 DEG C be pyrolyzed or
Low temperature distillation.
4. fine coal low temperature distillation technique according to claim 3, it is characterised in that after gas retort system start-up, the load
Heating gas is to be partly into burner by preheating gas remaining circulating gas is heated to 750～950 DEG C with air burning, plus
The fuel of heat is coal gas, and exhaust combustion gases are directly entered in heat-carrying coal gas, calorific value only 1500～1800 kilocalories of residual gas,
The heat smoke of raw coal drying separately need to be provided with air stove.
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Application publication date: 20170426 |