CN109539239A - A kind of low heat-extraction system and its processing method of coal-burning boiler - Google Patents
A kind of low heat-extraction system and its processing method of coal-burning boiler Download PDFInfo
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- CN109539239A CN109539239A CN201811407776.XA CN201811407776A CN109539239A CN 109539239 A CN109539239 A CN 109539239A CN 201811407776 A CN201811407776 A CN 201811407776A CN 109539239 A CN109539239 A CN 109539239A
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- denitration
- desulfurization
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- coal
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23B—METHODS OR APPARATUS FOR COMBUSTION USING ONLY SOLID FUEL
- F23B30/00—Combustion apparatus with driven means for agitating the burning fuel; Combustion apparatus with driven means for advancing the burning fuel through the combustion chamber
- F23B30/02—Combustion apparatus with driven means for agitating the burning fuel; Combustion apparatus with driven means for advancing the burning fuel through the combustion chamber with movable, e.g. vibratable, fuel-supporting surfaces; with fuel-supporting surfaces that have movable parts
- F23B30/06—Combustion apparatus with driven means for agitating the burning fuel; Combustion apparatus with driven means for advancing the burning fuel through the combustion chamber with movable, e.g. vibratable, fuel-supporting surfaces; with fuel-supporting surfaces that have movable parts with fuel supporting surfaces that are specially adapted for advancing fuel through the combustion zone
- F23B30/08—Combustion apparatus with driven means for agitating the burning fuel; Combustion apparatus with driven means for advancing the burning fuel through the combustion chamber with movable, e.g. vibratable, fuel-supporting surfaces; with fuel-supporting surfaces that have movable parts with fuel supporting surfaces that are specially adapted for advancing fuel through the combustion zone with fuel-supporting surfaces that move through the combustion zone, e.g. with chain grates
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/006—Layout of treatment plant
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
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Abstract
The present invention provides the low heat-extraction systems and its processing method of a kind of coal-burning boiler, and the system comprises dosage unit, grate firing boiler, additive adding unit, flue gas ash removal unit and tail gas desulfurization denitration units；Wherein, the coal-fired entrance of the material outlet with grate firing boiler of dosage unit is connected, and the material outlet of additive adding unit is connected with the burner hearth of grate firing boiler；The exhanst gas outlet of grate firing boiler is successively connected with flue gas ash removal unit and tail gas desulfurization denitration unit.The present invention is by using the moulded coal for being suitable for grate firing boiler, improve the coal-fired burning condition in grate firing boiler, it sprays into additive and optimizes the addition manner that addition adds, and combine vent gas treatment process, heat loss due to exhaust gas is eventually reduced, solid-unburning hot loss is reduced, reduces duff coal leakage quantity, improve boiler thermal efficiency, the discharge of pollutant is reduced, realizes Industrial Boiler minimum discharge.
Description
Technical field
The invention belongs to coal burning apparatus fields, are related to the low heat-extraction system and its processing method of a kind of coal-burning boiler, especially
It is related to a kind of low heat-extraction system and its processing method suitable for middle and small burn coal boiler.
Background technique
Chain furnace belongs to grate firing boiler, is widely applied in China's coal-burned industrial boiler.On combustion method, chain
Furnace is aided with the suspension combustion that fine particle constructs in fire grate upper area based on the combustion of constant speed traveling fire grate layer.Its air distribution is with furnace
The First air that row is sent into bottom occupies supplemented by leading, fire grate top Secondary Air.From burning theory, by means of reasonable one,
Secondary air separating is matched and distribution of the First air between each air compartment in fire grate lower part, and chain furnace theoretically can avoid NOxA large amount of lifes
At.
CN 107166428A and CN 106439792A etc. discloses grate firing boiler, by adjusting flue gas loop distribution with
Achieve the purpose that reduce discharged nitrous oxides.
However, existing industrial coal chain grate furnace is in the prevalence of following problems:
(1) boiler thermal efficiency is low, and averagely only 60% or so；
Traveling-grate stoker in the process of running, because excess air coefficient is big or high fume temperature is (because flue gas short circuit etc. causes pair
Caused by the heat that stream heating surface absorbs high-temperature flue gas weakens) to will lead to flue gas heat loss big, and this is to influence boiler thermal efficiency
Main cause.
Meanwhile causing solid is imperfect combustion will cause because carbon content in the bottom ash is up to 20wt%~30wt% and ashpit losses
Heat loss.
The moulded coal of wet forming is in Industrial Boiler because of coal (including volatile matter, cohesiveness, coking capacity, water content and ash content
Content etc.), granularity, the factors such as additive and burning condition, it is low that there are burn-off rates, non-burn-through problem.
(2) desulphurization denitration dedusting transformation or newly-increased operating cost are high, and there are secondary pollutions；
Under the requirement of industry coal-boiler minimum discharge, mostly use semidry method (flue gas circulating fluidized bed de- in terms of desulfurization
Sulphur) or wet desulphurization (such as Dual alkali and single alkaline process).In terms of denitration, strong oxidizer oxidation (such as sodium hypochlorite and smelly is mostly used
The methods of oxygen etc.) and catalyst oxidation (such as manganese series catalyzer).In terms of dedusting, be mostly electric precipitation, bag-type dust or
High-precision filter bag is replaced on the basis of electric bag dust or increases wet-esp.However, using tail portion wet desulphurization or semidry method cigarette
Desulfurization not only takes up a large area, but also waste water and byproduct can be generated etc., secondary pollution is serious；Denitrating technique investment operation
It is at high cost.
Summary of the invention
Low for boiler thermal efficiency existing for existing grate firing boiler, desulphurization denitration dedusting transformation or newly-increased operating cost are high,
The problems such as pollutant emission is high, the present invention provides the low heat-extraction systems and its processing method of coal-burning boiler.The present invention by using
Suitable for the moulded coal of grate firing boiler, the coal-fired burning condition in grate firing boiler is improved, spray into additive and optimizes what addition added
Addition manner, and combine vent gas treatment process, eventually reduce heat loss due to exhaust gas, reduce solid-unburning hot loss,
Reduce duff coal leakage quantity, improve boiler thermal efficiency, reduce the discharge of pollutant, realizes Industrial Boiler minimum discharge.
To achieve this purpose, the present invention adopts the following technical scheme:
In a first aspect, the system comprises dosage unit, layers to fire the present invention provides a kind of low heat-extraction system of coal-burning boiler
Boiler, additive adding unit, flue gas ash removal unit and tail gas desulfurization denitration unit；Wherein, the material outlet of dosage unit with
The coal-fired entrance of grate firing boiler is connected, and the material outlet of additive adding unit is connected with the burner hearth of grate firing boiler；Grate firing boiler
Exhanst gas outlet be successively connected with flue gas ash removal unit and tail gas desulfurization denitration unit.
" low row " of the present invention refers to smoke content < 10mg/Nm in the flue gas of discharge3, SO2Content < 50mg/
Nm3, NOxContent < 200mg/Nm3。
In the present invention, " first " and " second ", it is only for component is distinguished in name, there is no it
His particular meaning.
System of the present invention, as fuel, optimizes coal-fired coal by using the moulded coal for meeting grate firing boiler burning feature
Matter, size shape and additive etc. make the matching of coal-fired and grate firing boiler, provide boiler efficiency；
Meanwhile by optimizing burning condition (such as coal seam thickness, fire grate revolving speed and reasonable wind distribution etc.), reduce dynamic combustion
Region increases diffusion combustion region, is conducive to the thermal environment of Combustion of Mould Coal.
Eventually by reducing heat loss due to exhaust gas, reducing solid-unburning hot loss and reducing duff coal leakage quantity, come
Improve boiler thermal efficiency；In conjunction with clean moulded coal and boiler attendance optimization, realize Industrial Boiler minimum discharge.
The removing of flue dust relies primarily on the desulfurization and dedusting of moulded coal solid ash and tail gas in the flue gas of system discharge of the present invention；
Desulfurization relies primarily on furnace injection compound additive and tail portion desulfurizing and denitrifying process；Denitration relies primarily on flue gas recirculation, carbon
Reduction or catalysis NO oxidation and tail portion desulfurizing and denitrifying process (high temperature+low temperature).
It is used as currently preferred technical solution below, but not as the limitation of technical solution provided by the invention, passes through
Following technical scheme can preferably reach and realize technical purpose and beneficial effect of the invention.
As currently preferred technical solution, the grate firing boiler is chain grate furnace.
Preferably, the dosage unit includes sequentially connected modified coal preparation unit and pre- coal bunker.
Preferably, the modified coal preparation unit is dry process moulded coal unit, and the dry process moulded coal unit includes
Specific device be this field in have device, so it will not be repeated.The key of modified coal preparation unit of the present invention is for type
The optimization of coal quality composition, size shape and additive etc. in coal.
Preferably, the burner hearth connection of the pre- coal bunker and the right boiler of layer passes through the right boiler of layer under conditions of anoxic
Burner hearth in calory burning pre-burning is carried out to the clean moulded coal of addition, its most of fugitive constituent is precipitated under reducing atmosphere,
It burns through coke layer, flue gas pollutant discharge is effectively reduced.
As currently preferred technical solution, the material outlet of the additive adding unit and the burner hearth of grate firing boiler
In combustion zone be connected, the combustion zone be high temperature combustion zone.
Preferably, the additive adding unit include blower, it is heating device, air generator, powder feeder unit, charged
Device and injection apparatus；Wherein, heating device includes first heater and secondary heating mechanism, blower and first heater
Connection, the export pipeline of pipeline and powder feeder unit after connection converge, and the pipeline after converging is connected with charge device, charge device
It is connected with injection apparatus, injection apparatus is connected with the furnace combustion zone of grate firing boiler；Air generator is through secondary heating mechanism
It is connected to the bottom of powder feeder unit.
Preferably, the charge device includes charged needle, charged needle rack, insulation tube, ground loop and power supply, wherein lotus
Acusector and charged needle rack are placed in insulation tube, and charged needle is vertical with charged needle rack and is connected, and charged needle rack is fixed on absolutely
In edge pipe, ground loop is connected around insulation tube, power supply is surrounded with charged needle rack.
Preferably, the blower is roots blower.
In the present invention, in order to better disperse compound additive agent powder, to being stored in, superfine powder in powder feeder unit is first
It is constantly dried by the pressure-air heated, is loosened, to reduce the liquid bridge power between powder granule, while increasing its flowing
Property；Later, it mixes and is heated with the high-speed flow that blower is formed from the powder that powder feeder unit flows out, enter charged dress jointly
It sets, powder granule is made to carry upper a large amount of electrostatic charges, prevent intergranular mutual reunion using the electrostatic repulsion between electrically charged particle,
It is at the dispersity of substantially uniformity, there is optimum activity state, is finally sprayed by the injection apparatus of front end.It crosses herein
Cheng Zhong, making powder granule charged to greatest extent is the key that realize powder dispersion, anti-agglomeration.
The charged needle and charged needle rack of the charge device are mounted in insulation tube, and charged needle passes through bracket and power supply phase
Even, power supply, charged needle and ground loop form a stronger corona field, make powder granule when passing through the insulation tube due to electrostatic field
Charged effect, keep powder charged to greatest extent, so that there are biggish coulomb repulsion power between making particle.
The thermal environment and desulfuration in furnace mechanism of present invention combination grate firing boiler, according to the chemistry and object for actually using coal in furnace
Characteristic is managed, forms compound additive using a variety of sulfur-removing additives for capableing of effectively desulfurization in different temperatures respectively, from
And it is effectively carried out in the range of making desulphurization reaction in grate firing boiler from low temperature to high temperature.And the additive that the present invention uses
Dispersion technology in furnace optimizes the residence time and reaction condition of additive and flue gas in effecting reaction section, to make
Desulphurization reaction effectively carries out in the range of from low temperature to high temperature.
The present invention is sprayed using compound additive into burner hearth, and specific compound additive disperses spraying technique, breaks through layer
The limitation of combusting boiler furnace sorbent injection desulfurization low efficiency.By high efficiency dispersion technique, effective dispersion of superfine powder may be implemented, most
The advantages of big degree reduces the clustering phenomena of powder, gives full play to the high-specific surface area of superfine composite additive, high activity, finally
Realize furnace injection high-efficiency desulfurization.
As currently preferred technical solution, the exhanst gas outlet of the grate firing boiler is equipped with flue gas recirculation pipeline and layer fires
Air compartment in boiler is connected.
Preferably, it is set between the air compartment in the flue gas recirculation pipeline and grate firing boiler of the smoke outlet of the grate firing boiler
There is first gas conveying device.
Preferably, the first gas conveying device includes circulating fan.
In the present invention, is returned in burner hearth by flue gas a part that grate firing boiler is discharged, utilize inert gas in flue gas
Heat absorption and oxygen concentration reduction, reduce flame temperature, inhibit burning velocity, create reducing atmosphere, to reduce NOx。
The present invention can reduce NO in chain furnace using flue gas recirculationxProduction quantity, while reducing to a certain extent
Temperature in burner hearth, to thermal NOxGeneration play very big inhibiting effect.In addition, flue gas recirculation can make burner hearth
Interior O2The reduction of volume fraction, while CO2Volume fraction increases, to fuel type NOxGeneration play a certain amount of inhibiting effect.
As currently preferred technical solution, the flue gas ash removal unit includes bag filter.
Preferably, the tail gas desulfurization denitration unit includes standing type desulfuring and denitrifying apparatus.
Tail gas desulfurization denitration unit mainly solves the outer SO of grate firing boiler furnace in the present invention2And NOxAbsorption problem.
As currently preferred technical solution, the standing type desulfuring and denitrifying apparatus includes sequentially connected desulfurization unit
With denitration unit.
Need first to carry out desulfurization process in tail gas desulfurization denitration unit of the present invention and carry out denitration process again, be due to
SO in flue gas2Discharge amount seriously affect the denitration efficiency of denitrfying agent.
Preferably, the desulfurization unit includes at least two desulfurizing tower.
Preferably, at least two desulfurizing tower series connection and/or in parallel, i.e., the described desulfurizing tower can be used in series can also be with
It is used in parallel, it can also connect and the mode of cooperation in parallel uses.
Preferably, desulfuration adsorbent built in the desulfurizing tower, flue gas enters through desulfurization tower bottom or top to be adsorbed through desulfurization
Desulfurizing tower is discharged after agent absorption, flue dust is discharged from desulfurization tower bottom.
Preferably, the desulfuration adsorbent is low-temp desulfurization adsorbent of the desulfurization temperature in 100 DEG C~300 DEG C, is taken off
Sulphur temperature can be 100 DEG C, 130 DEG C, 150 DEG C, 170 DEG C, 200 DEG C, 230 DEG C, 250 DEG C, 270 DEG C or 300 DEG C etc., but simultaneously not only limit
It is equally applicable in other unlisted numerical value in cited numerical value, the numberical range.
Preferably, the porosity of the desulfuration adsorbent be 0.5%~0.6%, such as 0.5%, 0.52%, 0.54%,
0.56%, 0.58% or 0.6% etc., it is not limited to cited numerical value, other interior unlisted numerical value of the numberical range
It is equally applicable.
In the present invention, 100 DEG C~300 DEG C of low-temp desulfurization additive is selected, and high porosity additive is combined to form skill
Art realizes the flue gas desulfurization of back-end ductwork.
Preferably, the denitration unit includes at least one denitrating tower, and number can be 1,2,3,4,5,6
A, 7 or 8 etc. and more, it is not limited to cited numerical value, other unlisted numerical value are same in the numberical range
Sample is applicable in, preferably at least 2 denitrating towers.
Preferably, at least two denitrating tower series connection and/or in parallel, i.e., the described denitrating tower can be used in series can also be with
It is used in parallel, it can also connect and the mode of cooperation in parallel uses.
Preferably, denitrfying agent built in the denitrating tower, flue gas enter after denitrfying agent denitration through denitration tower bottom or top
Desulfurizing tower is discharged.
Preferably, the denitration adsorbent includes the low-temperature denitration adsorbent for denitration temperature in 100 DEG C~300 DEG C,
Its denitration temperature can be 100 DEG C, 130 DEG C, 150 DEG C, 170 DEG C, 200 DEG C, 230 DEG C, 250 DEG C, 270 DEG C or 300 DEG C etc., but not
It is only limitted to cited numerical value, other unlisted numerical value are equally applicable in the numberical range.
Preferably, the porosity of the denitration adsorbent be 0.5%~0.6%, such as 0.5%, 0.52%, 0.54%,
0.56%, 0.58% or 0.6% etc., it is not limited to cited numerical value, other interior unlisted numerical value of the numberical range
It is equally applicable.
It is oxidation NO to NO to the main function that tail gas carries out auxiliary denitration in the present invention2Simultaneously by tail gas desulfurization denitration
Additive in unit etc. effectively absorbs, remaining NO in denitration additive used in the unit and flue gasxReaction reaches deep
Spend denitration.
In the present invention, back-end ductwork standing type assists desulfurizing and denitrifying process, is considering chemical thermodynamics and kinetics
Etc. on the basis of factors, the characteristics of according to processes such as desulphurization denitrations, determine the additive formulations of stagewise removing.
As currently preferred technical solution, the standing type desulfuring and denitrifying apparatus includes pipeline and is set in turn in pipe
Desulfurization module and denitration module inside road.
Preferably, the flue gas ash removal unit is placed in the front of desulfurization module in pipeline.
Preferably, the desulfurization module is desulfurizing agent case, desulfuration adsorbent built in desulfurizing agent case.
Preferably, the cabinet of the desulfurizing agent case is net cage, desulfuration adsorbent built in net cage.
Preferably, the desulfuration adsorbent includes the low-temp desulfurization adsorbent for desulfurization temperature in 100 DEG C~300 DEG C.
Preferably, the porosity of the desulfuration adsorbent be 0.5%~0.6%, such as 0.5%, 0.52%, 0.54%,
0.56%, 0.58% or 0.6% etc., it is not limited to cited numerical value, other interior unlisted numerical value of the numberical range
It is equally applicable.
Preferably, the denitration module is denitrfying agent case, denitrfying agent built in denitrfying agent case.
Preferably, the cabinet of the denitrfying agent case is net cage, denitrfying agent built in net cage.
Preferably, the denitration adsorbent includes the low-temperature denitration adsorbent for denitration temperature in 100 DEG C~300 DEG C.
Preferably, the porosity of the denitration adsorbent be 0.5%~0.6%, such as 0.5%, 0.52%, 0.54%,
0.56%, 0.58% or 0.6% etc., it is not limited to cited numerical value, other interior unlisted numerical value of the numberical range
It is equally applicable.
As currently preferred technical solution, the system also includes second gas conveying device and chimney, the tail
The flue gas of desulfurization denitration unit discharge is sent into chimney through second gas conveying device.
Preferably, the second gas conveying device includes air-introduced machine.
Second aspect, the present invention provides the processing methods of above-mentioned low heat-extraction system, the described method comprises the following steps:
(a) moulded coal being prepared is added in grate firing boiler and successively carries out fugitive constituent precipitation, gasification and coke burning, produced
Furnace body is discharged in raw flue gas；
(b) in step (a) moulded coal in grate firing boiler in the process of processing, compound addition is added into grate firing boiler
The processing of agent participation moulded coal；
(c) flue gas of step (a) the discharge furnace body is successively discharged after flue gas ash removal and tail gas desulfurization denitration.
As currently preferred technical solution, step (a) moulded coal is the moulded coal that dry-press process is prepared.
Preferably, in step (a) moulded coal volatile content be 30wt%~35%, such as 30wt%, 31wt%,
32wt%, 33wt%, 34wt% or 35wt% etc., it is not limited to cited numerical value, interior other of the numberical range are not arranged
The numerical value of act is equally applicable；Additive level be 10wt%~15wt%, such as 10wt%, 11wt%, 12wt%, 13wt%,
14wt% or 15wt% etc., it is not limited to cited numerical value, other interior unlisted numerical value of the numberical range are equally suitable
With；Ash content < 25wt%, such as 20wt%, 17wt%, 15wt%, 13wt% or 10wt etc., it is not limited to cited number
Value, other interior unlisted numerical value of the numberical range are equally applicable.
Preferably, the additive is desulfurization denitrification agent, and preferably desulphurization denitration temperature is de- in 100 DEG C~300 DEG C
Sulphur denitrfying agent, desulphurization denitration temperature can for 100 DEG C, 130 DEG C, 150 DEG C, 170 DEG C, 200 DEG C, 230 DEG C, 250 DEG C, 270 DEG C or
300 DEG C etc., it is not limited to cited numerical value, other interior unlisted numerical value of the numberical range are equally applicable.
Wherein, the average grain diameter of step (a) moulded coal can be 8 × 20 × 35mm.
In the present invention, for grate firing boiler when burn scattered coal when, chain converter fly ash coefficient 0.1~0.2, flue dust raw emissions
Concentration is in 1500mg/Nm3~2500mg/Nm3.Simultaneously as scattered coal particle size range variation greatly, partial size it is inhomogenous (duff leak,
Coarse coal fires endless) it will cause carbon content in the bottom ash height.And the industrial shaping coal of wet therapy forming process preparation is used, because of its intensity and grain
Diameter cause to burn greatly it is insufficient, plus excess air coefficient it is big, it is low to will lead to boiler thermal efficiency.
And for moulded coal, the main pollution for the influence atmospheric environment that when moulded coal for dry process for forming preparation of burning is discharged
There is significant decrease when object concentration relatively burning scattered coal.Wherein, total dust concentration can be reduced 80% or more, and lingemann blackness also reaches
The requirement of national environmental protection is arrived.As it can be seen that burning industrial moulded coal is obvious compared with solid dirt effect efficiency brought by burning scattered coal, and then make
Existing tail portion dust collecting process without the high-precision filter bag of replacement or selects the star-like filter bag of Wrinkled without increasing dedusting area
Keep smoke content up to standard.
Preferably, step (a) grate firing boiler in the process of running ulking thickness coal-fired on fire grate be 8cm~
13cm, such as 8cm, 9cm, 10cm, 11cm, 12cm or 13cm etc., it is not limited to cited numerical value, in the numberical range
Other unlisted numerical value are equally applicable.
Preferably, step (a) grate firing boiler in the process of running fire grate revolving speed be 0~10m/h, such as 1m/h,
3m/h, 5m/h, 7m/h or 10m/h etc., it is not limited to cited numerical value, other interior unlisted numerical value of the numberical range
It is equally applicable.
Preferably, step (a) moulded coal is added in grate firing boiler by dosage unit.
Preferably, the flue gas that volume content 15%~20% is drawn from the flue gas of step (a) discharge furnace body returns to layer combustion
In the air compartment of boiler, extraction can be 15%, 16%, 17%, 18%, 19% or 20% etc., it is not limited to cited
Numerical value, other unlisted numerical value are equally applicable in the numberical range.
Preferably, step (b) compound additive includes desulfurization denitrification agent, and preferably desulphurization denitration temperature is at 100 DEG C
Desulfurization denitrification agent in~300 DEG C, desulphurization denitration temperature can for 100 DEG C, 130 DEG C, 150 DEG C, 170 DEG C, 200 DEG C, 230 DEG C,
250 DEG C, 270 DEG C or 300 DEG C etc., it is not limited to cited numerical value, other interior unlisted numerical value of the numberical range are same
Sample is applicable in.
Preferably, the average grain diameter of step (b) the compound addition be 0.2mm~0.4mm, such as 0.2mm, 0.25mm,
0.3mm, 0.35mm or 0.4mm etc., it is not limited to cited numerical value, other interior unlisted numerical value of the numberical range are same
Sample is applicable in, preferably 0.3mm.
Preferably, step (b) compound additive sprays into grate firing boiler through charged dispersion.
Preferably, the charged dispersion sprays into the penetrating rate in grate firing boiler as 15m/s~25m/s, such as 15m/s,
17m/s, 20m/s, 23m/s or 25m/s etc., it is not limited to cited numerical value, other are unlisted in the numberical range
Numerical value is equally applicable, preferably 20m/s.
Preferably, step (b) compound additive is added in grate firing boiler by additive adding unit.
It is special in conjunction with coal-fired chemistry, physics based on the combustion mechanism and thermal environment of coal-fired chain grate furnace in the present invention
Property, it chooses and forms compound additive using a variety of sulfur-removing additives for capableing of effectively desulfurization in different temperatures respectively.
By the penetrating of compound additive, carbon burning and carbon reduction reaction occurs while desulfurization in grate firing boiler, creates also Primordial Qi
Atmosphere and generation carbon reduction reaction, inhibit or reduce NOxGeneration.
The dominant mechanism of heterogeneous reduction reaction occurs on coke surface are as follows: a NO molecule is adsorbed on coke first in flue gas
Surface Creation surface carbon nitrogen component (- CN), another molecule and (- CN) are combined and are released N2.The partial size of compound additive is smaller,
It is bigger in the heterogeneous reduction rate of coke surface.NO can also be reduced to N in coke surface2O, N2O can take out in coke surface via oxygen
It proposes reaction generation heterogeneous decomposition and releases N2, and then reduce the discharge of nitrogen oxides.
Under the catalytic action of coke, NO can be reduced to N by CO2, while the CO generated2, the increase of CO can improve NO also
Former efficiency, while inhibiting the generation of HCN.
Preferably, step (c) the tail gas desulfurization denitration includes first desulfurization denitration again.
Preferably, the desulfurization temperature is 100 DEG C~300 DEG C.
Preferably, the denitration temperature is 100 DEG C~300 DEG C.
Preferably, step (c) flue gas ash removal carries out in flue gas ash removal unit.
Preferably, step (c) the tail gas desulfurization denitration carries out in tail gas desulfurization denitration unit.
Preferably, it the described method comprises the following steps:
(a) moulded coal that dry-press process is prepared and/or the moulded coal that pulverized coal forming is prepared are added by dosage unit
Enter successively to carry out fugitive constituent precipitation, gasification and coke burning in grate firing boiler, furnace body is discharged in the flue gas of generation, wherein the moulded coal
Middle volatile content is 30wt%~35%, and additive level is 10wt%~15wt%, and ash content < 25wt%, additive is de-
Desulfurization denitrification agent of the sulphur denitration temperature in 100 DEG C~300 DEG C；Accumulation coal-fired on fire grate is thick in the process of running for grate firing boiler
Degree is 8cm~13cm；The air compartment that the flue gas return grate firing boiler of volume content 15%~20% is drawn in the flue gas of furnace body is discharged
In；
(b) in step (a) moulded coal in grate firing boiler in the process of processing, by additive adding unit to layer fire
The processing that compound additive participates in moulded coal is added in boiler, wherein compound additive includes desulphurization denitration temperature 100 DEG C~300
Desulfurization denitrification agent in DEG C, the average grain diameter of compound addition are 0.2mm~0.4mm, and compound additive sprays into layer through charged dispersion
In combusting boiler；
(c) flue gas of step (a) the discharge furnace body successively carries out flue gas ash removal and tail gas desulfurization through flue gas ash removal unit
Denitration unit is discharged after carrying out tail gas desulfurization denitration, and wherein tail gas desulfurization denitration includes first desulfurization denitration again, desulfurization temperature 100
DEG C~300 DEG C, denitration temperature is 100 DEG C~300 DEG C.
Compared with prior art, the invention has the following advantages:
(1) present invention combines factors, use and the boiler types such as coal characteristic, size controlling, additive and burning condition
Matched moulded coal, by reducing heat loss due to exhaust gas, solid-unburning hot loss etc., boiler combustion efficiency is greatly improved；
(2) present invention closes combustion mechanism, the Sulfur releasing characteristic, NO of grate firing boilerxFormation and reduction mechanism and thermal environment,
On the basis of considering the factors such as chemical thermodynamics and kinetics, the characteristics of according to processes such as desulphurization denitrations, in furnace body
The multicomponent additive of ultra-fine size is used to obtain high reaction activity, optimizes additive and flue gas stops in effecting reaction section
Time and reaction condition are stayed, the desulphurization denitration between the low, medium and high temperature whole district is realized, desulfuration in furnace efficiency can be made to be greater than
80%, denitration in the stove efficiency is greater than 30%；
(3) system of the present invention can be such that the efficiency of combustion of boiler improves to 80% or more, in the flue gas of discharge system
Smoke content < 10mg/Nm3, SO2Content < 50mg/Nm3, NOxContent < 200mg/Nm3。
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the low heat-extraction system of coal-burning boiler described in the embodiment of the present invention 1；
Fig. 2 is the structural schematic diagram of additive adding unit described in the embodiment of the present invention 1；
Fig. 3 is the structural schematic diagram of charge device described in the embodiment of the present invention 1；
Fig. 4 is the structural schematic diagram of tail gas desulfurization denitration unit described in the embodiment of the present invention 1；
Fig. 5 is the structural schematic diagram of tail gas desulfurization denitration unit described in the embodiment of the present invention 2；
Wherein, 1- grate firing boiler, 2- modified coal preparation unit, the pre- coal bunker of 3-, 4- additive adding unit, 5- flue gas remove
Dirt unit, 6- tail gas desulfurization denitration unit, 7- second gas conveying device, 8- chimney, 9- first gas conveying device, 41- wind
Machine, 42- heating device, 43- air generator, 44- powder feeder unit, 45- charge device, 46- injection apparatus, 421- first add
Thermal, 422- secondary heating mechanism, the charged needle of 451-, the charged needle rack of 452-, 453- insulation tube, 454- ground loop, 455-
Power supply, 61- desulfurizing tower, 62- denitrating tower, 63- desulfurization module, 64- desulfurization module.
Specific embodiment
In order to better illustrate the present invention, it is easy to understand technical solution of the present invention, below further specifically to the present invention
It is bright.But following embodiments is only simple example of the invention, does not represent or limit the scope of the present invention, this
Invention protection scope is subject to claims.
Specific embodiment of the invention part provides the low heat-extraction system and its processing method of a kind of coal-burning boiler, the system
System includes dosage unit, grate firing boiler 1, additive adding unit 4, flue gas ash removal unit 5 and tail gas desulfurization denitration unit 6；Its
In, the material outlet of dosage unit is connected with the coal-fired entrance of grate firing boiler 1, the material outlet and layer of additive adding unit 4
The burner hearth of combusting boiler 1 is connected；The exhanst gas outlet of grate firing boiler 1 successively with 6 phase of flue gas ash removal unit 5 and tail gas desulfurization denitration unit
Even.
It the treating method comprises:
(a) moulded coal being prepared is added in grate firing boiler 1 and successively carries out fugitive constituent precipitation, gasification and coke burning,
Furnace body is discharged in the flue gas of generation；
(b) in step (a) moulded coal in grate firing boiler 1 in the process of processing, compound add is added into grate firing boiler
Agent is added to participate in the processing of moulded coal；
(c) flue gas of step (a) the discharge furnace body is successively discharged after flue gas ash removal and tail gas desulfurization denitration.
The following are typical but non-limiting embodiments of the invention:
Embodiment 1:
The low heat-extraction system and its processing method of a kind of coal-burning boiler are present embodiments provided, as shown in Figure 1, the system packet
Include dosage unit, grate firing boiler 1, additive adding unit 4, flue gas ash removal unit 5, tail gas desulfurization denitration unit 6, second gas
7 air-introduced machine of conveying device and chimney 8；The material outlet of dosage unit is connected with the coal-fired entrance of grate firing boiler 1, additive addition
The material outlet of unit 4 is connected with the burner hearth of grate firing boiler 1；The exhanst gas outlet of grate firing boiler 1 successively with flue gas ash removal unit 5 and
Tail gas desulfurization denitration unit 6 is connected, and the flue gas of tail gas desulfurization denitration unit discharge conveys 7 devices through second gas and is sent into chimney 8；
Wherein, grate firing boiler 1 is chain grate furnace；
Dosage unit includes sequentially connected modified coal preparation unit 2 and pre- coal bunker 3, and modified coal preparation unit 2 includes
Dry process moulded coal unit, the burner hearth connection of pre- coal bunker 3 and the right boiler 1 of layer；
As shown in Fig. 2, the additive adding unit includes blower 41, heating device 42, air generator 43, powder supply
Device 44, charge device 45 and injection apparatus 46；Heating device 42 includes first heater 421 and secondary heating mechanism 422,
Blower 41 is connect with first heater 421, and the export pipeline of the pipeline after connection and powder feeder unit 44 converges, the pipe after converging
Road is connected with charge device 45, and charge device 45 is connected with injection apparatus 46, the height of the burner hearth of injection apparatus 46 and grate firing boiler 1
Warm combustion zone is connected；Air generator 43 is connected to the bottom of powder feeder unit 44 through secondary heating mechanism 422；Blower 41 is sieve
Thatch blower；
As shown in figure 3, the charge device 45 includes charged needle 451, charged needle rack 452, insulation tube 453, ground loop
454 and power supply 455, wherein charged needle 451 and charged needle rack 452 are placed in insulation tube 453, charged needle 451 and charged needle branch
Frame 452 is vertical and is connected, and charged needle rack 452 is fixed in insulation tube 453, and ground loop 454 is around encirclement insulation tube 453, electricity
Source 455 is connected with charged needle rack 452；
The exhanst gas outlet of grate firing boiler 1 is equipped with flue gas recirculation pipeline and is connected with the air compartment in grate firing boiler 1, flue gas recirculation pipe
9 circulating fan of first gas conveying device is equipped between air compartment in road and grate firing boiler 1；
Flue gas ash removal unit 5 is high-voltage electrostatic dust separator；
As shown in figure 4, tail gas desulfurization denitration unit 4 includes standing type desulfuring and denitrifying apparatus comprising sequentially connected de-
Sulphur unit and denitration unit include 4 desulfurizing towers 61 in desulfurization unit, and the first two desulfurizing tower 61 is in parallel, latter two desulfurizing tower 61
Parallel connection, flue gas enter top discharge from 61 bottom of the first two desulfurizing tower, deliverying unit flue gas from 61 top of latter two desulfurizing tower into
Enter top discharge, denitration unit is entered after discharge, flue dust is discharged in 61 bottom of desulfurizing tower, and desulfuration adsorbent built in desulfurizing tower 61 takes off
Sulfur absorbent is low-temp desulfurization adsorbent of the desulfurization temperature in 100 DEG C~300 DEG C, and desulfuration adsorbent is denitration temperature 100
DEG C~300 DEG C in low-temperature denitration adsorbent, the porosity of desulfuration adsorbent is 0.55%~0.56%；Denitration unit includes 1
A denitrating tower 62, denitrfying agent built in denitrating tower 62, flue gas enters through 62 bottom of denitrating tower is discharged desulfurizing tower after denitrfying agent denitration
62, denitration adsorbent is low-temperature denitration adsorbent of the denitration temperature in 100 DEG C~300 DEG C, and the porosity of denitration adsorbent is
0.55%~0.56%.
The processing method of the system includes:
(a) moulded coal that dry-press process is prepared is added in grate firing boiler 1 by dosage unit and successively carries out fugitive constituent
Be precipitated, furnace body is discharged in gasification and coke burning, the flue gas of generation, wherein in the moulded coal volatile content be 33wt%~
35wt%, additive level are 10wt%~13wt%, ash content < 25wt%, additive be desulphurization denitration temperature 100 DEG C~
Desulfurization denitrification agent in 300 DEG C；Ulking thickness coal-fired on fire grate is 10cm~11cm, layer to grate firing boiler 1 in the process of running
Combusting boiler 1 in the process of running fire grate revolving speed be 5m/h~6m/h；Be discharged furnace body flue gas in draw volume content 16%~
17% flue gas returns in the air compartment of grate firing boiler 1；
(b) in step (a) moulded coal in grate firing boiler in the process of processing, by additive adding unit 4 to layer
In combusting boiler 2 be added compound additive participate in moulded coal processing, wherein compound additive be desulphurization denitration temperature 100 DEG C~
Desulfurization denitrification agent in 300 DEG C, the average grain diameter of compound addition are 0.3mm, and compound additive sprays into layer through charged dispersion and fires pot
In furnace；
(c) flue gas of step (a) the discharge furnace body successively carries out flue gas ash removal and tail gas desulfurization through flue gas ash removal unit 5
Denitration unit 6 is discharged after carrying out tail gas desulfurization denitration, and wherein tail gas desulfurization denitration includes first desulfurization denitration again, and desulfurization temperature is
100 DEG C~300 DEG C, denitration temperature is 100 DEG C~300 DEG C.
In the present embodiment from system be discharged flue gas in smoke content < 8mg/Nm3, SO2Content < 45mg/Nm3, NOx
Content < 180mg/Nm3, efficiency of combustion 85%.
Embodiment 2:
The low heat-extraction system and its processing method of a kind of coal-burning boiler are present embodiments provided, the structure of the system is referring to real
Structure in example 1 is applied, difference is: as shown in figure 5, the standing type desulfuring and denitrifying apparatus includes pipeline and is set in turn in pipeline
Internal desulfurization module 63 and denitration module 64, flue gas ash removal unit 5 is placed in the front of desulfurization module 63 in pipeline, desulfurization module
63 be desulfurizing agent case, and the cabinet of desulfurizing agent case is net cage, desulfuration adsorbent built in net cage；Denitration module 64 is denitrfying agent case, is taken off
The cabinet of nitre agent case is net cage, denitrfying agent built in net cage；The porosity of desulfuration adsorbent is 0.5%~0.53%, denitration absorption
The porosity of agent is 0.5%~0.53%.
The processing method of the low heat-extraction system is referring to embodiment 1, and difference is: volatile content in moulded coal in step (a)
For 30wt%~33wt%, additive level is 14wt%~15wt%, and ash content < 25wt%, grate firing boiler 1 is in the process of running
On fire grate coal-fired ulking thickness be 8cm~10cm, grate firing boiler 1 in the process of running fire grate revolving speed be 8m/h~10m/h,
It is discharged in the air compartment for the flue gas return grate firing boiler 1 for drawing volume content 15%~16% in the flue gas of furnace body；It is multiple in step (b)
The average grain diameter for closing addition is 0.2mm.
In the present embodiment from system be discharged flue gas in smoke content < 10mg/Nm3, SO2Content < 50mg/Nm3, NOx
Content < 200mg/Nm3, efficiency of combustion 82%.
Embodiment 3:
The low heat-extraction system and its processing method of a kind of coal-burning boiler are present embodiments provided, the structure of the system is referring to real
Apply structure in example 1, difference is: the porosity of desulfuration adsorbent is 0.58%~0.6%, and the porosity of denitration adsorbent is
0.58%~0.6%.
The processing method of the low heat-extraction system is referring to embodiment 1, and difference is: volatile content in moulded coal in step (a)
For 33wt%~35wt%, additive level is 10wt%~12wt%, and ash content < 25wt%, grate firing boiler 1 is in the process of running
On fire grate coal-fired ulking thickness be 12cm~13cm, grate firing boiler 1 in the process of running fire grate revolving speed be 7m/h~8m/h,
It is discharged in the air compartment for the flue gas return grate firing boiler 1 for drawing volume content 18%~20% in the flue gas of furnace body；It is multiple in step (b)
The average grain diameter for closing addition is 0.38mm.
In the present embodiment from system be discharged flue gas in smoke content < 9mg/Nm3, SO2Content < 48mg/Nm3, NOx
Content < 190mg/Nm3, efficiency of combustion 83%.
Comparative example 1:
This comparative example provides a kind of coal-burning boiler system and its processing method, and the structure of the system is referring to embodiment 1
Middle structure, difference are: the fire coal used in the system is scattered coal.
Its processing method is referring to the method in embodiment 1.
This comparative example can make chain converter fly ash coefficient reach 0.1~0.2, flue dust raw emissions are dense due to the scattered coal of use
Degree is in 1500~2500mg/Nm3, while there is also coal-fired non-burn-through problem, thereby reduce the efficiency of combustion of boiler.
This comparative example, the smoke content > 30mg/Nm from the flue gas that system is discharged3, SO2Content be about 100mg/Nm3,
NOxContent > 250mg/Nm3, efficiency of combustion is only 76%.
Comparative example 2:
This comparative example provides a kind of coal-burning boiler system and its processing method, and the structure of the system is referring to embodiment 1
Middle structure, difference are: not including additive adding unit 4 in the system, i.e., do not add compound additive into boiler.
This comparative example is not due to that compound additive is added inside burner hearth, can make flue gas pollutant discharge increase, Jin Ercong
Smoke content > 35mg/Nm in the flue gas of system discharge3, SO2Content be about 130mg/Nm3, NOxContent > 280mg/Nm3,
Efficiency of combustion is only 75%.
Comparative example 3:
This comparative example provides a kind of coal-burning boiler system and its processing method, and the structure of the system is referring to embodiment 1
Middle structure, difference are: in tail gas desulfurization denitration unit, before denitration unit is located at desulfurization unit.
Its processing method is referring to method in embodiment 1.
This comparative example due to carrying out desulfurization after first carrying out denitration in tail gas desulfurization denitration unit, can make denitration efficiency sharply under
Drop, and then the smoke content > 20mg/Nm from the flue gas that system is discharged3, SO2Content be about 110mg/Nm3, NOxContent >
300mg/Nm3Efficiency of combustion is 78%.
It can be seen that the present invention with comparative example based on the above embodiments and combine coal characteristic, size controlling, additive and combustion
The factors such as burning condition, using with the matched moulded coal of boiler type, pass through reduce heat loss due to exhaust gas, solid-unburning hot loss
Deng boiler combustion efficiency greatly improves；
Combustion mechanism, the Sulfur releasing characteristic, NO of present invention conjunction grate firing boilerxFormation and reduction mechanism and thermal environment,
On the basis of considering the factors such as chemical thermodynamics and kinetics, the characteristics of according to processes such as desulphurization denitrations, adopted in furnace body
With the multicomponent additive of ultra-fine size to obtain high reaction activity, optimize additive and flue gas in the stop in effecting reaction section
Time and reaction condition realize the desulphurization denitration between the low, medium and high temperature whole district, and desulfuration in furnace efficiency can be made to be greater than 80%,
Denitration in the stove efficiency is greater than 30%；
System of the present invention can be such that the efficiency of combustion of boiler improves to 80% or more, flue dust in the flue gas of discharge system
Content < 10mg/Nm3, SO2Content < 50mg/Nm3, NOxContent < 200mg/Nm3。
The Applicant declares that the present invention is explained by the above embodiments detailed process equipment and process flow of the invention,
But the present invention is not limited to the above detailed process equipment and process flow, that is, it is above-mentioned detailed not mean that the present invention must rely on
Process equipment and process flow could be implemented.It should be clear to those skilled in the art, any improvement in the present invention,
Addition, selection of concrete mode of equivalence replacement and auxiliary element to each raw material of product of the present invention etc., all fall within of the invention
Within protection scope and the open scope.
Claims (10)
1. a kind of low heat-extraction system of coal-burning boiler, which is characterized in that the system comprises dosage unit, grate firing boiler, additives
Adding unit, flue gas ash removal unit and tail gas desulfurization denitration unit；Wherein, the combustion of the material outlet and grate firing boiler of dosage unit
Coal entrance is connected, and the material outlet of additive adding unit is connected with the burner hearth of grate firing boiler；The exhanst gas outlet of grate firing boiler according to
It is secondary to be connected with flue gas ash removal unit and tail gas desulfurization denitration unit.
2. low heat-extraction system according to claim 1, which is characterized in that the grate firing boiler is chain grate furnace；
Preferably, the dosage unit includes sequentially connected modified coal preparation unit and pre- coal bunker；
Preferably, the modified coal preparation unit is dry process moulded coal unit；
Preferably, the burner hearth connection of the pre- coal bunker and the right boiler of layer.
3. low heat-extraction system according to claim 1 or 2, which is characterized in that the material outlet of the additive adding unit
It is connected with the combustion zone in the burner hearth of grate firing boiler；
Preferably, the additive adding unit includes blower, heating device, air generator, powder feeder unit, charge device
And injection apparatus；Wherein, heating device includes first heater and secondary heating mechanism, and blower and first heater connect
Connect, the export pipeline of pipeline and powder feeder unit after connection converges, and the pipeline after converging is connected with charge device, charge device with
Injection apparatus is connected, and injection apparatus is connected with the furnace combustion zone of grate firing boiler；Air generator connects through secondary heating mechanism
It is connected to the bottom of powder feeder unit；
Preferably, the charge device includes charged needle, charged needle rack, insulation tube, ground loop and power supply, wherein charged needle
It is placed in insulation tube with charged needle rack, charged needle is vertical with charged needle rack and is connected, and charged needle rack is fixed on insulation tube
Interior, ground loop is connected around insulation tube, power supply is surrounded with charged needle rack；
Preferably, the blower is roots blower.
4. low heat-extraction system according to claim 1-3, which is characterized in that the exhanst gas outlet of the grate firing boiler is set
There is flue gas recirculation pipeline to be connected with the air compartment in grate firing boiler；
Preferably, the is equipped between the air compartment in the flue gas recirculation pipeline and grate firing boiler of the smoke outlet of the grate firing boiler
One air transporting arrangement；
Preferably, the first gas conveying device includes circulating fan.
5. low heat-extraction system according to claim 1-4, which is characterized in that the flue gas ash removal unit removes for cloth bag
Dirt device；
Preferably, the tail gas desulfurization denitration unit includes standing type desulfuring and denitrifying apparatus.
6. low heat-extraction system according to claim 5, which is characterized in that the standing type desulfuring and denitrifying apparatus includes successively connecting
The desulfurization unit and denitration unit connect；
Preferably, the desulfurization unit includes at least two desulfurizing tower；
Preferably, at least two desulfurizing tower series connection and/or parallel connection；
Preferably, desulfuration adsorbent built in the desulfurizing tower, flue gas enters through desulfurization tower bottom or top to be inhaled through desulfuration adsorbent
Attached discharge desulfurizing tower, flue dust are discharged from desulfurization tower bottom；
Preferably, the desulfuration adsorbent is low-temp desulfurization adsorbent of the desulfurization temperature in 100 DEG C~300 DEG C；
Preferably, the porosity of the desulfuration adsorbent is 0.5%~0.6%；
Preferably, the denitration unit includes at least one denitrating tower, preferably at least 2 denitrating towers；
Preferably, at least two denitrating tower series connection and/or parallel connection；
Preferably, denitrfying agent built in the denitrating tower, flue gas enters after denitrfying agent denitration through denitration tower bottom or top to be discharged
Desulfurizing tower；
Preferably, the denitration adsorbent is low-temperature denitration adsorbent of the denitration temperature in 100 DEG C~300 DEG C；
Preferably, the porosity of the denitration adsorbent is 0.5%~0.6%.
7. low heat-extraction system according to claim 5, which is characterized in that the standing type desulfuring and denitrifying apparatus include pipeline and
It is set in turn in the desulfurization module and denitration module of channel interior；
Preferably, the flue gas ash removal unit is placed in the front of desulfurization module in pipeline；
Preferably, the desulfurization module is desulfurizing agent case, desulfuration adsorbent built in desulfurizing agent case；
Preferably, the cabinet of the desulfurizing agent case is net cage, desulfuration adsorbent built in net cage；
Preferably, it is preferable that the desulfuration adsorbent is low-temp desulfurization adsorbent of the desulfurization temperature in 100 DEG C~300 DEG C；
Preferably, the porosity of the desulfuration adsorbent is 0.5%~0.6%；
Preferably, the denitration module is denitrfying agent case, denitrfying agent built in denitrfying agent case；
Preferably, the cabinet of the denitrfying agent case is net cage, denitrfying agent built in net cage；
Preferably, the denitration adsorbent includes the low-temperature denitration adsorbent for denitration temperature in 100 DEG C~300 DEG C；
Preferably, the porosity of the denitration adsorbent is 0.5%~0.6%.
8. low heat-extraction system according to claim 1-7, which is characterized in that it is defeated that the system also includes second gas
Device and chimney are sent, the flue gas of the tail gas desulfurization denitration unit discharge is sent into chimney through second gas conveying device；
Preferably, the second gas conveying device includes air-introduced machine.
9. the processing method of low heat-extraction system according to claim 1-8, which is characterized in that the method includes with
Lower step:
(a) moulded coal being prepared is added in grate firing boiler and successively carries out fugitive constituent precipitation, gasification and coke burning, generation
Furnace body is discharged in flue gas；
(b) in step (a) moulded coal in grate firing boiler in the process of processing, into grate firing boiler be added compound additive ginseng
With the processing of moulded coal；
(c) flue gas of step (a) the discharge furnace body is successively discharged after flue gas ash removal and tail gas desulfurization denitration.
10. the processing method of system according to claim 9, which is characterized in that step (a) moulded coal is dry-press process
The moulded coal being prepared；
Preferably, in step (a) moulded coal volatile content be 30wt%~35wt%, additive level be 10wt%~
15wt%, ash content < 25wt%；
Preferably, the additive is desulfurization denitrification agent, and preferably desulfurization of the desulphurization denitration temperature in 100 DEG C~300 DEG C is de-
Nitre agent；
Preferably, ulking thickness coal-fired on fire grate is 8cm~13cm to step (a) grate firing boiler in the process of running；
Preferably, step (a) grate firing boiler in the process of running fire grate revolving speed be 0~10m/h；
Preferably, step (a) moulded coal is added in grate firing boiler by dosage unit；
Preferably, the flue gas for volume content 15%~20% being drawn from the flue gas of step (a) discharge furnace body returns to grate firing boiler
Air compartment in；
Preferably, step (b) compound additive includes desulfurization denitrification agent, and preferably desulphurization denitration temperature is 100 DEG C~300
Desulfurization denitrification agent in DEG C；
Preferably, the average grain diameter of step (b) the compound addition is 0.2mm~0.4mm, preferably 0.3mm；
Preferably, step (b) compound additive sprays into grate firing boiler through charged dispersion；
Preferably, the penetrating rate that the charged dispersion sprays into grate firing boiler is 15m/s~25m/s, preferably 20m/s；
Preferably, step (b) compound additive is added in grate firing boiler by additive adding unit；
Preferably, step (c) the tail gas desulfurization denitration includes first desulfurization denitration again；
Preferably, the desulfurization temperature is 100 DEG C~300 DEG C；
Preferably, the denitration temperature is 100 DEG C~300 DEG C；
Preferably, step (c) flue gas ash removal carries out in flue gas ash removal unit；
Preferably, step (c) the tail gas desulfurization denitration carries out in tail gas desulfurization denitration unit；
Preferably, it the described method comprises the following steps:
(a) layer is added by dosage unit in the moulded coal that dry-press process is prepared and/or the moulded coal that pulverized coal forming is prepared
Fugitive constituent precipitation, gasification and coke burning are successively carried out in combusting boiler, furnace body is discharged in the flue gas of generation, wherein waving in the moulded coal
Hair part content is 30wt%~35%, and additive level is 10wt%~15wt%, ash content < 25wt%, and additive is de- for desulfurization
Desulfurization denitrification agent of the nitre temperature in 100 DEG C~300 DEG C；Ulking thickness coal-fired on fire grate is grate firing boiler in the process of running
8cm~13cm；It is discharged in the air compartment for the flue gas return grate firing boiler for drawing volume content 15%~20% in the flue gas of furnace body；
(b) in step (a) moulded coal in grate firing boiler in the process of processing, by additive adding unit to grate firing boiler
The middle processing that compound additive is added and participates in moulded coal, wherein compound additive includes desulphurization denitration temperature in 100 DEG C~300 DEG C
Desulfurization denitrification agent, the average grain diameter of compound addition is 0.2mm~0.4mm, and compound additive sprays into layer combustion pot through charged dispersion
In furnace；
(c) flue gas of step (a) the discharge furnace body successively carries out flue gas ash removal and tail gas desulfurization denitration through flue gas ash removal unit
Unit is discharged after carrying out tail gas desulfurization denitration, and wherein tail gas desulfurization denitration includes first desulfurization denitration again, and desulfurization temperature is 100 DEG C~
300 DEG C, denitration temperature is 100 DEG C~300 DEG C.
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