CN108410489A - Clean coal production system and production method - Google Patents
Clean coal production system and production method Download PDFInfo
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- CN108410489A CN108410489A CN201710074392.XA CN201710074392A CN108410489A CN 108410489 A CN108410489 A CN 108410489A CN 201710074392 A CN201710074392 A CN 201710074392A CN 108410489 A CN108410489 A CN 108410489A
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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
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G1/00—Production of liquid hydrocarbon mixtures from oil-shale, oil-sand, or non-melting solid carbonaceous or similar materials, e.g. wood, coal
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L5/00—Solid fuels
- C10L5/02—Solid fuels such as briquettes consisting mainly of carbonaceous materials of mineral or non-mineral origin
- C10L5/04—Raw material of mineral origin to be used; Pretreatment thereof
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Abstract
The present invention provides a kind of clean coal production system and production methods.The production method includes：It is that pyrolysis heat source is pyrolyzed feed coal at least partly high-temperature flue gas of coal-fired power station boiler or fuel oil station boiler, obtain pyrolysis oil gas and clean coal, high-temperature flue gas obtains medium temperature flue gas after carrying out pyrolysis heat exchange to feed coal, high-temperature flue gas is directly derived from the burner hearth high-temperature region of coal-fired power station boiler or fuel oil station boiler, the temperature T of high-temperature flue gas1≥900℃.Heat source by high-temperature flue gas caused by coal-fired power station boiler or fuel oil furnace of power-plant boilers before exchanging heat with boiler water as raw material pyrolysis of coal, the needs of raw material pyrolysis of coal can not only be met, and the part high-temperature flue gas can be made to be fully used, realize the coproduction in power station and clean coal production.
Description
Technical field
The present invention relates to coal chemical technologies, in particular to a kind of clean coal production system and production method.
Background technology
Coal dissipates to burn, compared with coal fired power plant, consumption terminal coal quality is poor,
Pollutant catabolic gene difficulty is big.And coal grading is used to refine technology, the volatile matter in coal can be extracted as high value added product (tar
And coal gas), while sulphur and volatile matter are partially removed in coal, obtain clean coal (semicoke).The cleaning obtained by above-mentioned means
Coal (semicoke) pollutant emission in burning can significantly reduce, therefore by a organized way to big city periphery supplying clean coal generation
Coal is burnt for original inferior dissipate, then is to solve coal in China to dissipate an active path for burning pollution.But the classification refining of current mainstream
Technology is required for configuring independent heat source and exhaust gas processing device, and investment is relatively high.
Invention content
The main purpose of the present invention is to provide a kind of clean coal production system and production methods, to solve in the prior art
The higher problem of clean coal plant investment.
To achieve the goals above, according to an aspect of the invention, there is provided a kind of clean coal production method, the production
Method includes：It is that pyrolysis heat source carries out feed coal at least partly high-temperature flue gas of coal-fired power station boiler or fuel oil station boiler
Pyrolysis, obtains pyrolysis oil gas and clean coal, high-temperature flue gas obtain medium temperature flue gas, high temperature cigarette after carrying out pyrolysis heat exchange to feed coal
Gas is directly derived from the burner hearth high-temperature region of coal-fired power station boiler or fuel oil station boiler, temperature T1 >=900 DEG C of high-temperature flue gas, preferably
T1>=930 DEG C, more preferable T1≥950℃。
Further, before being pyrolyzed to above-mentioned raw materials coal, further include with medium temperature flue gas be at least partially dried heat
The process that source is thermally dried feed coal, medium temperature flue gas cool-down is heat exchange flue gas after completing heat drying.
Further, the temperature T of above-mentioned medium temperature flue gas2Between 250~350 DEG C, preferably T2Between 280~320 DEG C,
More preferable T2Between 290~310 DEG C.
Further, the temperature of the feed coal after above-mentioned drying be 90~150 DEG C, preferably 100~140 DEG C, more preferably
It is 110~130 DEG C.
Further, when above-mentioned medium temperature flue gas cannot meet drying source demand, production method further includes that part is high
Warm flue gas mixes the process as drying source with medium temperature flue gas.
Further, above-mentioned heat drying is implemented by the way of direct contact heat transfer, O in drying source2Volume contain
Amount is less than or equal to 4%, is preferably smaller than equal to 3%.
Further, above-mentioned raw materials coal is the coal dust that granularity is less than or equal to 30mm, and the mode of preferably direct contact heat transfer is
Drying source and coal dust cocurrent mixed heat transfer.
Further, aforementioned production method further includes the wind regime loopback combustion that will be exchanged heat flue gas as at least partly coal dust and convey
The step of coal utility boiler or fuel oil station boiler carry out second-time burning, generates boiler smoke, preferred production process further includes profit
The step of purified treatment is carried out to boiler smoke with the smoke eliminator in power station, purified treatment include successively to boiler smoke into
Capable dust removal process, denitration process and desulfurization process.
Further, aforementioned production method further includes the process that processing is dusted to pyrolysis oil gas, preferably dust removal process
Process include：First time dedusting is carried out to pyrolysis oil gas using grain bed deduster, obtains rough dedusting pyrolysis oil gas, preferably
The cleaning coal particle that pyrolysis generates is filled in grain bed deduster, clean coal grain diameter is 5~10mm, temperature is 500~600
℃；And second of dedusting is carried out to rough dedusting pyrolysis oil gas using High Temperature Ceramic Filter, it obtains being pyrolyzed net gas.
Further, aforementioned production method further includes the process handled clean coal, preferably to clean coal at
The process of reason includes：Clean coal is cooled to 200~250 DEG C using inert gas, obtains medium temperature clean coal；Preferably, it uses
Inert gas completes the process that clean coal cools down in coke dry quenching furnace；Screening and spray cooling processing are carried out to medium temperature clean coal,
Obtain 90~110 DEG C of finished product clean coal.
According to the another aspect of the application, a kind of clean coal production system is provided, including pass through the first flue gas delivery pipe
Road connected heating unit and pyrolysis unit, heating unit are coal-fired power station boiler or fuel oil station boiler, coal-fired power station boiler
With fuel oil station boiler there is burner hearth, burner hearth to have high temperature superheater entrance, furnace outlet and the first exhanst gas outlet, the first flue gas
Between high temperature superheater entrance and furnace outlet, pyrolysis unit has the first thermal source inlet and the second exhanst gas outlet for outlet,
First exhanst gas outlet of heating unit is connected by the first smoke conveying duct with the first thermal source inlet of pyrolysis unit.
Further, above-mentioned clean coal production system further includes drying unit, drying unit have Secondary Heat Source entrance and
Third exhanst gas outlet, the Secondary Heat Source entrance of drying unit and the second exhanst gas outlet of pyrolysis unit pass through the second flue gas delivery pipe
Road is connected.
Further, the first exhanst gas outlet of above-mentioned heating unit is conveyed by third smoke conveying duct and the second flue gas
Pipeline is connected.
Further, above-mentioned heating unit also has wind regime entrance, the third exhanst gas outlet of wind regime entrance and drying unit
It is connected by the 4th smoke conveying duct.
Further, power station has gas cleaning unit where above-mentioned heating unit, and preferably gas cleaning unit includes edge
Dust-extraction unit, denitrification apparatus and the desulfurizer that flow of flue gas direction is set gradually.
Further, above-mentioned pyrolysis unit includes pyrolysis oil gas vent and cleaning coal export, and clean coal production system is also wrapped
It includes：Oil gas dust removing units are pyrolyzed, are connected with the pyrolysis oil gas vent of pyrolysis unit；Clean coal processing unit, including be connected cold
But device and separator, cooling device include clean coal entrance, and clean coal entrance is connected with cleaning coal export.
Further, above-mentioned pyrolysis oil gas dust removing units include：Grain bed deduster has pyrolysis oil gas entrance and oil gas
Outlet, pyrolysis oil gas entrance are connected with pyrolysis oil gas vent, are preferably filled with cleaning coal particle, clean coal in grain bed deduster
The grain size of particle is 5~10mm, temperature is 500~600 DEG C；High Temperature Ceramic Filter passes through oil gas vent and grain bed dedusting
Device is connected.
It applies the technical scheme of the present invention, the flue gas of coal-fired power station boiler or fuel oil power boiler burning is used for heating boiler
Water is allowed to become steam to be power electric generators, but the flue-gas temperature after heating boiler water cannot meet the pyrolysis of feed coal
Need, thus by high-temperature flue gas caused by coal-fired power station boiler or fuel oil furnace of power-plant boilers with boiler water exchange heat before conduct
The heat source of raw material pyrolysis of coal to meet the temperature needs of raw material pyrolysis of coal, and can make the part high temperature cigarette
Gas is fully used, and realizes the coproduction in power station and clean coal production.
Description of the drawings
The accompanying drawings which form a part of this application are used to provide further understanding of the present invention, and of the invention shows
Meaning property embodiment and its explanation are not constituted improper limitations of the present invention for explaining the present invention.In the accompanying drawings：
Fig. 1 shows the structural representation for the clean coal production system that a kind of exemplary embodiment according to the present invention provides
Figure；And
Fig. 2 shows a kind of structural schematic diagrams for the clean coal production system that preferred embodiment provides according to the present invention.
Wherein, above-mentioned attached drawing includes the following drawings label：
1, the first smoke conveying duct；2, the second smoke conveying duct；3, third smoke conveying duct；4, the 4th flue gas is defeated
Send pipeline；10, heating unit；20, pyrolysis unit；30, drying unit；40, gas cleaning unit；41, dust-extraction unit；42, it takes off
Nitre device；43, desulfurizer；50, oil gas dust removing units are pyrolyzed；51, grain bed deduster；52, High Temperature Ceramic Filter；60、
Clean coal processing unit；61, cooling device；62, separator.
Specific implementation mode
It should be noted that in the absence of conflict, the features in the embodiments and the embodiments of the present application can phase
Mutually combination.The present invention will be described in detail below with reference to the accompanying drawings and embodiments.
As recorded in background technology, in the prior art since clean coal production needs to configure at independent heat source and tail gas
Device is managed, causes its investment and energy consumption higher.And since national electricity needs over the past two years slows down, and thermoelectricity is installed speedup mistake
Soon, thermoelectricity is caused to utilize hourage rapid decrease, national thermoelectricity is only averagely 4300 hours using hourage within 2015, thermal power station
Rate of load condensate is whole all relatively low.In addition as new energy installed capacity increases, tradition will as the fired power generating unit of main force's power supply power supply
Gradually become the regulating units of power grid, unit also will be further compromised using hourage, and improving fired power generating unit utilization rate becomes mesh
Preceding problem in the urgent need to address.Based on this, the application by the extra thermal energy of fired power generating unit be supplied to clean coal production system with
Realize the maximum utilization ratio of thermal energy.Therefore, in a kind of typical embodiment of the application, a kind of clean coal production is provided
Method, the production method include：It is pyrolysis heat source at least partly high-temperature flue gas of coal-fired power station boiler or fuel oil station boiler
Feed coal is pyrolyzed, pyrolysis oil gas and clean coal are obtained, above-mentioned high-temperature flue gas obtains after carrying out pyrolysis heat exchange to feed coal
To medium temperature flue gas, wherein high-temperature flue gas is directly derived from the burner hearth high-temperature region of coal-fired power station boiler or fuel oil station boiler, high temperature cigarette
The temperature T of gas1≥900℃。
The flue gas of coal-fired power station boiler or fuel oil power boiler burning is allowed to become steam to be power generation for heating boiler water
Machine provides power, but the flue-gas temperature after heating boiler water cannot meet the pyrolysis needs of feed coal, therefore by coal fired power plant
Heat source of the high-temperature flue gas caused by boiler or fuel oil furnace of power-plant boilers before exchanging heat with boiler water as raw material pyrolysis of coal, from
And the temperature needs of raw material pyrolysis of coal can not only be met, and the part high-temperature flue gas can be made to be fully used, it realizes
The coproduction in power station and clean coal production.
In order to preferably make raw material pyrolysis of coal, the temperature T of preferably above-mentioned high-temperature flue gas1>=930 DEG C, more preferable T1≥950
℃。
The above-mentioned preheating and drying to feed coal may be used preheating method conventional in the prior art and carry out, and the application is preferred
Before being pyrolyzed to feed coal, it is to be at least partially dried heat source to feed coal that aforementioned production method, which further includes with medium temperature flue gas,
The process being thermally dried, medium temperature flue gas cool-down is heat exchange flue gas after completing heat drying.It is completed to original in high-temperature flue gas
After the heating pyrolysis for expecting coal, cooling becomes medium temperature flue gas, but the heat of the medium temperature flue gas can be used as drying source to raw material
Coal is thermally dried, to realize the recycling of heat.
, it is preferable to use temperature T when being thermally dried to feed coal using medium temperature flue gas2In between 250~350 DEG C
Warm flue gas, more preferable T2Between 280~320 DEG C, further preferred T2Between 290~310 DEG C.To avoid medium temperature flue gas temperature
It spends height Thermal desorption occurs when feed coal is dried and discharge of the coke oil and gas.It can be by it if medium temperature flue-gas temperature is excessively high
It is cooled to above-mentioned temperature to recycle, and once finds that medium temperature flue-gas temperature is excessively high, then can reflect thermal decomposition product temperature from side
Spend low, and thermal decomposition product temperature is too low, and be likely to result in tar in product condenses in pyrolysis reactor, leads to reactor
It blocks.
For the application when to raw material pyrolysis of coal, the temperature of the feed coal after preferably drying is 90~150 DEG C, more preferably
100~140 DEG C, more preferably 110~130 DEG C.
When being thermally dried to feed coal using above-mentioned medium temperature flue gas, if medium temperature flue gas cannot meet drying source
Demand, preferably aforementioned production method further include the process mixed part high-temperature flue gas with medium temperature flue gas as drying source.I.e.
High-temperature flue gas is mixed with medium temperature flue gas, the temperature of drying source is improved, makes its meet demand.
Above-mentioned pyrolytic process, high-temperature flue gas and feed coal can exchange heat in an indirect way, can also be in direct contact and change
Heat preferably controls O in drying source in order to avoid feed coal is pyrolyzed in drying process2Volume content be less than or equal to
4%, it is further preferably no larger than equal to 3%.O in above-mentioned drying source2Content can be real by controlling boiler air coefficient of excess
It is existing, it when necessary can be by mixing N2、CO2Non-oxidizing gas are waited to realize.
When using indirect mode heat exchange, processing preferably is dusted to high-temperature flue gas, avoids the flue dust in high-temperature flue gas
It is deposited in heat exchange pipeline, pipeline is blocked after long-term accumulated.
When being thermally dried to feed coal by the way of direct contact heat transfer, preferably first medium temperature flue gas is removed
Dirt processing, for example high-temperature electric dust removal process is used, to avoid excessive flue dust is introduced, influence subsequently to be pyrolyzed effect.In addition, in order to contract
Short heating time, preferred raw material coal are the coal dust that granularity is less than or equal to 30mm, and the mode of further preferred direct contact heat transfer is
Drying source and coal dust cocurrent mixed heat transfer.
Medium temperature flue gas still compares normal air to the temperature for the heat exchange flue gas that cooling after feed coal completion heat drying is formed
Temperature it is high, it can be considered to further be utilized to it, preferably in a kind of preferred embodiment of the application, above-mentioned producer
Method further includes：To exchange heat wind regime loopback coal-fired power station boiler that flue gas is conveyed as at least partly coal dust or fuel oil station boiler into
The step of row second-time burning.Power plant application is returned it into, on the one hand heat is made to be utilized effectively, on the other hand avoids medium temperature
Purified treatment before polluting or arrange outside caused by being arranged outside flue gas, has not only saved fume treatment cost, but also reduce power station
Operating cost.After the flue gas that will exchange heat returns to coal-fired power station boiler or fuel oil power boiler burning, boiler smoke is generated, it is excellent
It further includes the steps that carrying out purified treatment to boiler smoke using the smoke eliminator in power station to select aforementioned production method, at purification
Reason includes dust removal process, denitration process and the desulfurization process carried out successively to flue gas
Due to the load reduction in current power station, the flue gas that is discharged, which is also reduced, causes its smoke eliminator that cannot be filled
Divide and utilize, therefore gas cleaning processing is carried out to flue gas using it, not only realizes the purpose of gas cleaning, but also improve cigarette
The utilization ratio of air purifying apparatus makes resource obtain reasonable utilization.
In the application another kind preferred embodiment, aforementioned production method further includes being dusted place to pyrolysis oil gas in power station
The process of the process of reason, preferably dust removal process includes：First time dedusting is carried out to pyrolysis oil gas using grain bed deduster, is obtained
Rough dedusting is pyrolyzed oil gas, is preferably filled with cleaning coal particle in grain bed deduster, and the grain size of the cleaning coal particle is 5~
10mm, temperature are 500~600 DEG C；And second of dedusting is carried out to rough dedusting pyrolysis oil gas using High Temperature Ceramic Filter, it obtains
To the net gas of pyrolysis.
Pyrolysis generate 500~600 DEG C i.e. pyrolysis oil gas (for high temperature oil-containing gases), pyrolysis oil gas first by side into
Enter grain bed deduster, carrys out carrier of the cleaning coal particle directly as first time dedusting of self-pyrolysis unit generation, while right
Being pyrolyzed does not reduce the temperature of pyrolysis oil gas when oil gas dedusting, gas is evenly distributed on the windward side of grain bed by diffusing opening.
The thermal cleaning coal particle of 5~10mm is loaded in grain bed, particle is sent to by screw(-type) feeder in moving bed.Pyrolysis oil gas passes through
The dust in the gap of grain bed deduster, bulky grain is intercepted in duct, and the little particle that can not be intercepted (is slightly removed with gas
Dirt is pyrolyzed oil gas) enter refractory ceramics filter collector.With continuing for filtration time, the pressure drop of grain bed is begun to ramp up, and is taken
Particle with dust is discharged by the screw(-type) feeder of bottom, is added into stylish cleaning coal particle, is run during this
When to certain degree, bed pressure drop stablize it is certain numerically, can be with continuous service.Slightly removing from grain bed deduster
Dirt is pyrolyzed oil gas, and temperature is 550~600 DEG C, into refractory ceramics filter collector, is pyrolyzed net gas and enters downstream, dust is blocked
It cuts and is built up on filter core, the pressure of refractory ceramics filter collector is consequently increased, and passes through variable frequency adjustment wind turbine at this time
Pressure difference maintains tolerance to stablize filtering.With continuing for filtration time, the filter cake thickness on filter core increases, and refractory ceramics, which is crossed, to be filtered out
The resistance of dirt device constantly rises, and when filtration resistance rises to 3kPa, then filter core needs pulse cleaning (crushing of reduction filter core).
When blowback, high temperature pulse valve automatically opens, and using high pressure free jet, carries out blowback, the pressure difference of refractory ceramics filter collector
Restore.Filter cake after stripping is fallen into the centrum storehouse of deduster lower part, and the dust in centrum storehouse is released after reaching certain altitude, is let out
The coke powder put is conveyed using nitrogen.
In another preferred embodiment of the application, aforementioned production method further includes the process handled clean coal,
It is preferred that the process handled clean coal includes：Clean coal is cooled to 200~250 DEG C using inert gas, obtains medium temperature
Clean coal completes the process that clean coal cools down preferably by inert gas in coke dry quenching furnace；Medium temperature clean coal is sieved
Divide and spray cooling is handled, obtains 90~110 DEG C of finished product clean coal.The inert gas of coke dry quenching furnace cools down cleaning coal particle,
Inert gas after heat exchange goes boiler heat exchange to generate hot steam, while itself is cooled, is then recycled back to coke dry quenching furnace again
Carry out the process of dry coke quenching process and cooling clean coal.
In another typical embodiment of the application, a kind of clean coal production system is provided, as shown in Figure 1, should
Clean coal production system includes the heating unit 10 being connected by the first smoke conveying duct 1 and pyrolysis unit 20, heating unit
10 be coal-fired power station boiler or fuel oil station boiler, and the coal-fired power station boiler and the fuel oil station boiler have burner hearth, burner hearth tool
There are high temperature superheater entrance, furnace outlet and the first exhanst gas outlet, the first exhanst gas outlet to be located at high temperature superheater entrance and burner hearth
Between outlet, pyrolysis unit 20 has the first thermal source inlet and the second exhanst gas outlet, and the first smoke conveying duct is by heating unit
10 the first exhanst gas outlet is connected with the first thermal source inlet of pyrolysis unit 20.
Above the burner hearth of above-mentioned high temperature superheater setting station boiler, wherein the boiler favorably generated with power boiler burning
The boiler water that flue gas is heated, high temperature superheater entrance are the smoke inlet of high temperature superheater, and the first exhanst gas outlet is arranged
Between high temperature superheater entrance and the first exhanst gas outlet, the boiler smoke that can generate power boiler burning is (i.e. above-mentioned
High-temperature flue gas) before not exchanged heat with the boiler water in high temperature superheater it is delivered to pyrolysis unit.Therefore, in coal-fired electricity
Stand boiler or fuel oil station boiler burner hearth on the first exhanst gas outlet is set, its generated high-temperature flue gas is changed with boiler water
Heat source before hot as raw material pyrolysis of coal to meet the temperature needs of raw material pyrolysis of coal, and can make the portion
High-temperature flue gas is divided to be fully used.
Smoke heat energy is made full use of in order to realize, in the application another kind preferred embodiment, as shown in Fig. 2,
Above-mentioned clean coal production system further includes drying unit 30, and drying unit 30 has Secondary Heat Source entrance and third exhanst gas outlet,
The Secondary Heat Source entrance of drying unit 30 is connected with the second exhanst gas outlet of pyrolysis unit 20 by the second smoke conveying duct 2.
The flue gas that pyrolysis unit 20 generates is delivered to drying unit 30 using the second smoke conveying duct 2, for adding to feed coal
Heated drying.
When pyrolysis unit 20 generate flue gas cannot meet the temperature requirements of drying unit 30 when, preferably as shown in Fig. 2, on
The first exhanst gas outlet for stating heating unit 10 is connected by third smoke conveying duct 3 with the second smoke conveying duct 2.Utilize
Three smoke conveying ducts 3 and the second smoke conveying duct 2 are by the high-temperature flue gas and pyrolysis unit 20 in the burner hearth of heating unit 10
Heat drying of the realization of drying unit 30 to feed coal is delivered to after the flue gas mixing of generation.
The flue-gas temperature that the application drying unit 30 generates is still higher, in order to be made full use of to its heat, preferably
As shown in Fig. 2, there is heating unit 10 wind regime entrance, wind regime entrance and the third exhanst gas outlet of drying unit 30 to pass through the 4th cigarette
Letter shoot road 4 is connected.The flue gas that drying unit 30 generates is delivered to coal-fired power station boiler by the 4th smoke conveying duct 4
Or conveying power is provided for fuel as wind regime in the burner hearth of fuel oil station boiler, while fuel can also be heated in turn by its heat
Amount is utilized, and avoids pollution caused by row or the purified treatment before outer row outside heat exchange flue gas, has not only saved cigarette
Gas disposal cost, and reduce the operating cost in power station.
As it is well known to the skilled in the art, can all be arranged in power station gas cleaning unit with to the flue gas discharged into
Row purification makes flue gas reach discharge standard, and the power station where the heating unit 10 of the application also has gas cleaning unit 40, excellent
Choosing is as shown in Fig. 2, the gas cleaning unit 40 includes dust-extraction unit 41, denitrification apparatus 42 and the desulfurizer 43 of connection setting.
Device is made full use of in order to realize, which can be connected with the second smoke conveying duct 2 with to warp
The flue gas for crossing the second smoke conveying duct 2 carries out purified treatment.If flue gas caused by the drying unit 30 of certain the application
It does not recycle and discharges, its generated flue gas can also be discharged again after the processing of gas cleaning unit 40, realize power station
With many-sided coproduction of clean coal production system.
In addition, the clean coal production system of the application can also include being dusted to the flue gas for entering pyrolysis unit 20
Deduster, which, which can be arranged on the first smoke conveying duct 1, can also utilize gas cleaning unit 40 above-mentioned
Dust-extraction unit 41 replaces, and the flue gas in flue gas is avoided to lead to line clogging in the deposition of pyrolysis unit 20.
In the application another preferred embodiment, as shown in Fig. 2, above-mentioned pyrolysis unit 20 includes pyrolysis oil gas vent
With cleaning coal export, clean coal production system further includes pyrolysis oil gas dust removing units 50 and clean coal processing unit 60, pyrolysis oil
Gas dust removing units are connected with the pyrolysis oil gas vent of pyrolysis unit 20, and place is dusted with the pyrolysis oil gas generated to pyrolysis unit
Reason；Clean coal processing unit 60 includes the cooling device 61 being connected and separator 62, and cooling device 61 includes clean coal entrance,
Clean coal entrance is connected with cleaning coal export.
In order to realize that ideal dust removing effects, preferably above-mentioned pyrolysis oil gas dust removing units 50 include 51 He of grain bed deduster
High Temperature Ceramic Filter 52, grain bed deduster 51 have pyrolysis oil gas entrance and oil gas vent, pyrolysis oil gas entrance and pyrolysis
Oil gas vent is connected, and is preferably filled with cleaning coal particle in grain bed deduster, the grain size of the cleaning coal particle be 5~10mm,
Temperature is 500~600 DEG C；High Temperature Ceramic Filter 52 is connected by oil gas vent with grain bed deduster 51, and connection type can
Referring to Fig. 2.Specific dust removal process can refer to the description of aforementioned manufacturing method.
Clean coal production method is described in detail below in conjunction with the clean coal production system of the application.
Dryer section：
Drying unit drying source uses the medium temperature flue gas that pyrolysis unit generates, the medium temperature flue gas that temperature is 300 DEG C or so
Direct contact heat transfer is mixed using cocurrent in dry kiln with the feed coal that granularity is 0~30mm, the heat exchange cigarette obtained after heat exchange
Gas enters smoke stack emission after bag filter, air-introduced machine and flue gas desulfurization.Flue gas desulfurization is filled using the flue gas desulfurization in power station
Set implementation.When antipyretic flue-gas temperature is unsatisfactory for dry demand, introducing portion high-temperature flue gas.
Pyrolysis section：
Temperature is 100 DEG C or so of feed coal after drying, enters pyrolysis unit by screw(-type) feeder, and from station boiler
The temperature to come over is 950 DEG C or more of high-temperature flue gas, after air distribution is adjusted in the pipe of pyrolysis unit indirect heat exchange, after heat exchange
Medium temperature flue gas enter the drying source that high-temperature blower is delivered to drying unit as dry kiln；After being reacted at 500~600 DEG C
Clean coal and pyrolysis oil gas carry out subsequent processing below.The cigarette that the extra flue gas that station boiler is released can be prepared by power station
Outer row after the purification of gas clean unit.
It is pyrolyzed oil gas dedusting：
500~600 DEG C of high temperature oil-containing gases (being pyrolyzed oil gas) generated are pyrolyzed, into combination dust removing units, pyrolysis oil
Gas enters grain bed deduster by side first, and pyrolysis oil gas is evenly distributed on the windward side of grain bed by diffusing opening.
The thermal cleaning coal particle of 5~10mm is loaded in grain bed, particle is sent to by screw(-type) feeder in moving bed.Pyrolysis oil gas passes through
The gap of grain bed deduster, by the dust catching of bulky grain in duct, the little particle that can not be intercepted enters high temperature with gas
Ceramic filter deduster.With continuing for filtration time, the pressure drop of grain bed is begun to ramp up, and the particle for carrying dust passes through bottom
Screw(-type) feeder discharge, be added into stylish cleaning coal particle, when running to certain degree during this, bed pressure
Drop stablize it is certain numerically, can be with continuous service.Oil gas from grain bed deduster, 550~600 DEG C of temperature enter
Refractory ceramics filter collector, clean oil gas enter downstream, and dust is intercepted on filter core and builds up, the pressure of filter
It is consequently increased, at this time by the pressure difference of variable frequency adjustment wind turbine, tolerance is maintained to stablize filtering.With continuing for filtration time, filter
Filter cake thickness on core increases, and the resistance of filter constantly rises, and when filtration resistance rises to 3kPa, then filter core needs blowback
Regeneration (crushing of reduction filter core).When blowback, high temperature pulse valve automatically opens, and using high pressure free jet, carries out blowback, filtering
The pressure difference of device restores.Filter cake after stripping is fallen into the centrum storehouse of deduster lower part.Dust in centrum storehouse reaches certain altitude
After release, the coke powder released using nitrogen convey.
Clean coal processing：
For high-temperature cleaning coal at 500~600 DEG C, the inert gas through coke dry quenching furnace is cooled to 200~250 DEG C, subsequently distinguishes again
It is treated as finished product clean coal by screening and spray cooling depositing dust, the powder particles sifted out enter forming unit at 100 DEG C or so,
Clean type coal is produced as product.
Coal gas, tar are collected and processing：
Cooled down by spray column and horizontal water-tube cooler by the high temperature oil-containing gases of high-temperature dust removal, oil after cooling into
Enter to stand tank and further detach oil and water, after gas after cooling is using the further oil recovery of electric fishing, into desulfurization unit, takes off
Gas after sulphur enters gas reservoir or is supplied directly as outside fuel gas.Tar further can produce vapour by tar production
Oil, diesel oil etc..
It can be seen from the above description that the above embodiments of the present invention realize following technique effect：
The flue gas of coal-fired power station boiler or fuel oil power boiler burning is allowed to become steam to be power generation for heating boiler water
Machine provides power, but the flue-gas temperature after heating boiler water cannot meet the pyrolysis needs of feed coal, therefore by coal fired power plant
Heat source of the high-temperature flue gas caused by boiler or fuel oil furnace of power-plant boilers before exchanging heat with boiler water as raw material pyrolysis of coal, from
And the temperature needs of raw material pyrolysis of coal can not only be met, and the part high-temperature flue gas can be made to be fully used, it realizes
The coproduction in power station and clean coal production.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, any made by repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (17)
1. a kind of clean coal production method, which is characterized in that the production method includes：
It is that pyrolysis heat source is pyrolyzed feed coal at least partly high-temperature flue gas of coal-fired power station boiler or fuel oil station boiler,
It obtains pyrolysis oil gas and clean coal, the high-temperature flue gas obtains medium temperature flue gas, the height after carrying out pyrolysis heat exchange to feed coal
Warm flue gas is directly derived from the burner hearth high-temperature region of the coal-fired power station boiler or the fuel oil station boiler, the temperature of the high-temperature flue gas
Spend T1 >=900 DEG C, preferably T1>=930 DEG C, more preferable T1≥950℃。
2. production method according to claim 1, which is characterized in that before being pyrolyzed to the feed coal, also wrap
It is the process for being at least partially dried heat source and being thermally dried to the feed coal to include with the medium temperature flue gas, completes described add
The medium temperature flue gas cool-down is heat exchange flue gas after heated drying.
3. production method according to claim 2, which is characterized in that the temperature T of the medium temperature flue gas2At 250~350 DEG C
Between, the preferably described T2Between 280~320 DEG C, the more preferable T2Between 290~310 DEG C.
4. production method according to claim 3, which is characterized in that the temperature of the feed coal after the drying be 90~
150 DEG C, preferably 100~140 DEG C, more preferably 110~130 DEG C.
5. production method according to claim 4, which is characterized in that when the medium temperature flue gas cannot meet drying source need
When asking, the production method further includes the mistake mixed the part high-temperature flue gas with the medium temperature flue gas as drying source
Journey.
6. production method according to claim 4, which is characterized in that the heat drying uses the side of direct contact heat transfer
Formula is implemented, O in the drying source2Volume content be less than or equal to 4%, preferably smaller than be equal to 3%.
7. production method according to claim 6, which is characterized in that the feed coal is the coal that granularity is less than or equal to 30mm
The mode of powder, the preferably described direct contact heat transfer is the drying source and the coal dust cocurrent mixed heat transfer.
8. production method according to claim 7, which is characterized in that the production method further includes the flue gas conduct that will exchange heat
The step of at least partly coal-fired power station boiler or fuel oil station boiler described in the wind regime loopback of coal dust conveying carry out second-time burning, production
Raw boiler smoke, the preferably described production method further includes being purified to the boiler smoke using the smoke eliminator in power station
The step of processing, the purified treatment include dust removal process, denitration process and the desulfurization process carried out successively to boiler smoke.
9. production method according to claim 1, which is characterized in that the production method further includes to the pyrolysis oil gas
It is dusted the process of processing, the process of the preferably described dust removal process includes：
First time dedusting is carried out to the pyrolysis oil gas using grain bed deduster, obtains rough dedusting pyrolysis oil gas, it is preferably described
The cleaning coal particle that pyrolysis generates is filled in grain bed deduster, the clean coal grain diameter is 5~10mm, temperature is
500~600 DEG C；And
Second of dedusting is carried out to rough dedusting pyrolysis oil gas using High Temperature Ceramic Filter, obtains being pyrolyzed net gas.
10. production method according to claim 1, which is characterized in that the production method further includes to the clean coal
The process handled, the process preferably handled the clean coal include：
The clean coal is cooled to 200~250 DEG C using inert gas, obtains medium temperature clean coal；Preferably, described using lazy
Property gas completes the process that clean coal cools down in coke dry quenching furnace；
Screening and spray cooling processing are carried out to the medium temperature clean coal, obtain 90~110 DEG C of finished product clean coal.
11. a kind of clean coal production system includes the heating unit (10) being connected by the first smoke conveying duct (1) and pyrolysis
Unit (20), which is characterized in that
The heating unit (10) is coal-fired power station boiler or fuel oil station boiler, and the coal-fired power station boiler and the fuel oil are electric
There is boiler of standing burner hearth, the burner hearth to have high temperature superheater entrance, furnace outlet and the first exhanst gas outlet, first flue gas
Between the high temperature superheater entrance and the furnace outlet, the pyrolysis unit (20) has the first thermal source inlet for outlet
With the second exhanst gas outlet, first smoke conveying duct by first exhanst gas outlet of the heating unit (10) with it is described
First thermal source inlet of pyrolysis unit (20) is connected.
12. clean coal production system according to claim 11, which is characterized in that the clean coal production system further includes
Drying unit (30), the drying unit (30) have Secondary Heat Source entrance and third exhanst gas outlet, the drying unit (30)
Second exhanst gas outlet of the Secondary Heat Source entrance and the pyrolysis unit (20) pass through the second smoke conveying duct (2)
It is connected.
13. clean coal production system according to claim 12, which is characterized in that described the of the heating unit (10)
One exhanst gas outlet is connected by third smoke conveying duct (3) with second smoke conveying duct (2).
14. clean coal production system according to claim 12, which is characterized in that the heating unit (10) also has wind
The third exhanst gas outlet of source inlet, the wind regime entrance and the drying unit (30) passes through the 4th smoke conveying duct
(4) it is connected.
15. clean coal production system according to claim 14, which is characterized in that power station where the heating unit (10)
With gas cleaning unit (40), the preferably described gas cleaning unit (40) includes the dedusting set gradually along flow of flue gas direction
Device (41), denitrification apparatus (42) and desulfurizer (43).
16. clean coal production system according to claim 14, which is characterized in that the pyrolysis unit (20) includes pyrolysis
Oil gas vent and cleaning coal export, the clean coal production system further include：
Oil gas dust removing units (50) are pyrolyzed, are connected with the pyrolysis oil gas vent of the pyrolysis unit (20)；
Clean coal processing unit (60), including connected cooling device (61) and separator (62), the cooling device (61)
Including clean coal entrance, the clean coal entrance is connected with the cleaning coal export.
17. clean coal production system according to claim 16, which is characterized in that the pyrolysis oil gas dust removing units (50)
Including：
Grain bed deduster (51) has pyrolysis oil gas entrance and oil gas vent, the pyrolysis oil gas entrance and the pyrolysis oil
Gas outlet is connected, and is filled with cleaning coal particle in the preferably described grain bed deduster, and the grain size of the cleaning coal particle is 5~
10mm, temperature are 500~600 DEG C；
High Temperature Ceramic Filter (52) is connected by the oil gas vent with the grain bed deduster (51).
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Application publication date: 20180817 |