CN206069794U - The coal gasification of a kind of flying dust and waste water recirculation, cleaning system - Google Patents
The coal gasification of a kind of flying dust and waste water recirculation, cleaning system Download PDFInfo
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- CN206069794U CN206069794U CN201621050217.4U CN201621050217U CN206069794U CN 206069794 U CN206069794 U CN 206069794U CN 201621050217 U CN201621050217 U CN 201621050217U CN 206069794 U CN206069794 U CN 206069794U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/16—Combined cycle power plant [CCPP], or combined cycle gas turbine [CCGT]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/16—Combined cycle power plant [CCPP], or combined cycle gas turbine [CCGT]
- Y02E20/18—Integrated gasification combined cycle [IGCC], e.g. combined with carbon capture and storage [CCS]
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Abstract
The coal gasification of a kind of flying dust and waste water recirculation, cleaning system, by the water circulation use containing solid waste after the flying dust produced after gasification reaction a part of and concentration to prepare water-coal-slurry, Jing secondary nozzles put into gasification furnace again；The flying dust produced in synthetic gas cleaning system and waste water are comprehensively utilized by this utility model while being recycled in gasification system, the complexity of wastewater treatment in synthetic gas cleaning system can be reduced, liquid is not needed to be kept completely separate admittedly, synthesis gas temperature can also further be reduced using water-coal-slurry charging simultaneously, efficiency of carbon con version is improved to being close to 99%, the water vapour of saving is used for generating electricity, and can improve IGCC whole efficiencies about 0.2%～0.3%.
Description
Technical field
This utility model is related to the synthesis gas preparation system for being applied to integrated gasification combined cycle for power generation system, especially relates to
And coal gasification, the cleaning system of a kind of flying dust and waste water recirculation.
Background technology
Integrated gasification combined cycle plants (IGCC) be by Coal Gasification Technology and Combined cycle gas-steam turbine combine it is advanced
Electricity generation system, the features such as protrusion with generating efficiency height and environment-friendly advantage.IGCC is made up of two large divisions, i.e. coal gasification and purification
System and Combined cycle gas-steam turbine system.It is raw material that wherein gasification system mainly utilizes coal, (includes but does not limit with gasifying agent
In oxygen, hydrogen, air, water vapour etc.) there is chemical reaction, (key component includes CO, H to produce synthesis gas2、CH4), then
The purification process such as dry method dust, wet scrubbing, desulfurization are carried out to synthesis gas, to prepare the synthesis gas supply combustion and steam connection of cleaning
Close blood circulation to use.Gasification furnace is the key equipment in gasification system, the multistage powdered coal carrying bed solid-state row for using at present
Slag gasification furnace, dried coal dust is with high pressure N2Or CO2Transport classification and enter gasification furnace, corresponding O2Gasify with water vapour etc.
Agent is also classified and enters gasification furnace, i.e., the nozzle from gasification furnace body different level is injected into gasification furnace respectively so that charging
There is fractional order reaction from different gasifying agents in coal dust.The gasification furnace reduces synthesis gas temperature in gasification furnace using classification charging, can
To greatly reduce or even cancel the consumption of the cold synthesis gas of recirculation for cooling syngas, while by adjusting different level spray
The feed stream of mouth can also quickly change gasification furnace load.Flying containing unburnt carbon can be isolated during dry method dust
Ash, a portion flying dust are re-fed into gasification furnace with further with unburnt carbon in being sent to conveyer system of raw coal,
Improve efficiency of carbon con version.During wet scrubbing, a large amount of technique waste waters can be produced, this some processes waste water Jing stripping after with from
Water containing solid waste in dreg removing system is can return in system as various process waters through preliminary treatment and after clarifying, and utilizes
Band filter filters the solid after thickening and recyclable returns gasification furnace into conveyer system of raw coal.Due to gasification system
Limit, used in solid material can only be returned gasification system by purified synthesis gas flow process, this needs thoroughly to divide liquid solid
From equipment needed thereby is more, and complex process, economy are poor.
The content of the invention
The purpose of this utility model is to provide a kind of comprehensive utilization flying dust, technique waste water and slag inclusion waste water, and reduction is processed
Complexity, it is not necessary to the liquid for consuming big energy is completely separated admittedly, and reduces water vapour consumption and then improve generating efficiency
Flying dust and waste water recirculation coal gasification, cleaning system.
To reach above-mentioned purpose, system of the present utility model includes：Lower end is provided with the gasification furnace of dreg removing system and opens
It is located at the bottom-up first order nozzle being connected with vaporizer at gasification furnace different level, second level nozzle and third level spray
Mouth, wherein first order nozzle are connected with high pressure oxygen and high steam, dry pulverized coal fuel system respectively, second level nozzle with
Water-coal-slurry supply system is connected, and third level nozzle is connected with high steam and dry pulverized coal fuel system respectively；
The crude synthesis gas outlet of described gasification furnace successively with waste heat boiler, cyclone separating cleaner unit, scrubbing tower and de-
Sulfur device be connected produce purification after synthesis gas；
Described separation cyclone scrubber is collected a part of Jing fly ash carries device of flying dust for obtaining and is recycled to water-coal-slurry confession
System is answered, remaining flying dust removes system, the technique waste water Jing strippers that scrubbing tower is produced remove NH3And the gas of other absorptions,
Water-coal-slurry supply system is sent in clarified tower clarification again, concentration water containing solid waste Jing water containing the solid waste recirculation pump after clarified tower is processed
System, and the water after clarifying can then send into scrubbing tower and the cooling water inlet of dreg removing system recycles；
Described dreg removing system becomes solid slag discharge using water cooling liquid slag, and the water containing solid waste in dreg removing system is delivered to
Clarification tower clarification.
Described gasification furnace adopts cylindrical shape, by the vaporizer inside the bearing shell and bearing shell of concentrically circle arrangement
Constitute, press close to the chamber outer wall that gasifies between bearing shell and vaporizer and be provided with water-cooling wall.
Described every first order jet nozzle is arranged symmetrically using circumferential, i.e., four nozzles are respectively separated 90 ° of angles and are arranged in gasification furnace
On outer wall circumference, or two nozzle pitch, 180 ° of angles are arranged on gasification furnace outer wall circumference.
Described first, third level nozzle is provided with the independent fuel channel being connected with dry pulverized coal fuel system
And the independent gasifying agent passage being arranged on the outside of fuel channel.
Described dry pulverized coal fuel system includes coal dust bunker, coal dust exsiccator and the coal dust lock hopper being sequentially connected,
Wherein coal dust lock hopper is also connected with high pressure nitrogen, dry pulverized coal that the outlet of coal dust lock hopper is transported with high pressure nitrogen and first and third grade
The fuel channel of nozzle is connected.
Coal dust bunker that described water-coal-slurry supply system includes being sequentially connected, ore mill, water-coal-slurry agitator, water-coal-slurry
The water-coal-slurry that the outlet of filter, water-coal-slurry bunker and force (forcing) pump, wherein force (forcing) pump is formed and water in the nozzle of second level nozzle
Coal slurry channel is connected, and ore mill is also connected with fly ash carry device, the recirculation pump of water containing solid waste respectively by the road.
Operation principle of the present utility model is as follows：
A pulverized coal particle part of the average diameter less than 100 μm enters coal dust exsiccator by coal dust bunker and is dried removing moisture
Entering back into coal dust lock hopper carries out being pressurized the nozzle fuel passage for being transported to first order nozzle on gasification furnace using high pressure nitrogen, together
When gasifying agent high pressure oxygen and water vapour enter gasification furnace, coal dust and gasifying agent from gasifying agent passage in the nozzle of first order nozzle
There is chemical reaction inside gasification furnace to generate with CO, H2For the synthesis gas of main component, while a large amount of heat energy of release；
Another part coal dust then enters ore mill from coal dust bunker, while also adding from a part of whirlwind in ore mill
Flying dust and clarify the treated concentration waste water containing a fixed solid in tower that separator is collected, in ore mill
Solid average diameter is ground to less than 50 μm, is stirred subsequently into water-coal-slurry agitator, obtained homodisperse water coal
Slurry filters out larger granule into water-coal-slurry filter, enters back into the storage of water-coal-slurry bunker, after the pressurized pump pressurization of water-coal-slurry
Gasification furnace is injected into by second level nozzle on gasification furnace again, the fuel come in using first order nozzle and gasifying agent generationization
The heat that the high-temperature synthesis gas of reaction generation are brought is learned, the water in the water-coal-slurry that second level nozzle is come in is vaporized first and becomes steam
Gasifying agent is provided, remaining solid includes coal dust and contains uncompleted burned carbon after the water-coal-slurry removing moisture that second level nozzle is come in
Solid particle as fuel, the synthesis gas that produces after the fuel come in first order nozzle and gasifying agent gasification reaction and not
Synthesis gas further produced and gasification reaction in the fuel for reacting completely and gasifying agent there is；
The crude synthesis gas Jing waste heat boilers produced in gasification furnace reclaim heat cooling, and Jing separation cyclone scrubbers remove thick conjunction
Into the flying dust in gas, scrubbed tower washing removes the trace solid and NH for containing3Deng gas, Jing desulfurizers removing H2It is prepared by S
Synthesis gas after being purified；
Slag can be produced in coal gasification course and drains into dreg removing system in liquid form, dreg removing system utilizes water to cooling liquid state slag
Become solid slag, the waste water in dreg removing system is delivered to clarification tower and processed, and oarse-grained slag is then removed from dreg removing system；
Separation cyclone scrubber is collected a part of Jing fly ash carries device of flying dust for obtaining and is recycled to ore mill, remaining flying dust
System is then removed, and the technique waste water Jing strippers that scrubbing tower is produced remove NH3And the gas of other absorptions, then deliver to clarification tower
Clarified, while the water containing solid waste produced in gasification furnace dreg removing system also delivers to clarification tower in the lump processing, entered to clarify containing for tower
Solid waste water its solids content cannot be greater than 1.5wt%, and the water after processing in clarified tower returns scrubbing tower, dreg removing system circulation and makes
With, and the water containing solid waste after concentrating is recycled to ore mill to prepare water-coal-slurry by the recirculation pump of water containing solid waste.
Described gasification furnace starts and is first preheated to preferred 1300-1500 DEG C, puts into dry pulverized coal and oxygen from first order nozzle
The materials such as gas and water steam carry out gasification reaction, treat that crude synthesis gas yield reaches maintenance level, i.e. fluctuation circulates flying dust less than 5%
And the aquatic water-coal-slurry of producing containing solid waste puts into gasification furnace by second level nozzle until gasification furnace stable operation.
Described water-coal-slurry its dust burdening put into by gasification furnace second level nozzleDetermined by formula (1)：
Formula (1) functional relationship, normally close in linear function, but its concrete value is with the different and different of coal,
ButMaximum must not exceed both minima following, i.e., in (a) water-coal-slurry, maximum solid content contains in deducting water-coal-slurry
Coal amount；B () cyclone separating cleaner unit is maximum except dust quantity deducts the amount that ash component in the total coal amount of vaporized stove is changed into flying dust.Such as public affairs
Shown in formula (2)：
In formula (1)Respectively Jing first order nozzle, second level nozzle enter the quality of the coal of gasification furnace
Flow, c are the total conversion of carbon in gasification furnace, and r is the fuel i.e. coal and ash content phase that gasification furnace is entered by second level nozzle
For the optimum of total fuel quantity；
C in formula (2)solidFor water-coal-slurry maximum solid content,The water-coal-slurry of gasification furnace is entered for Jing second level nozzle
Mass flow,The mass flow of the coal of gasification furnace is entered for Jing second level nozzle,For cyclone separating cleaner unit
Maximum dedusting mass flow,It is the total mass flow rate of the coal into gasification furnace, δ is the quality that ash component becomes flying dust in coal
Fraction.
The flying dust produced in this utility model comprehensive utilization dust removal process, the technique waste water produced in washing process, deslagging
The slag inclusion waste water produced in system the gasification furnace for being recirculated to classification charging, give up in can reducing synthetic gas cleaning system
The complexity of water process, it is not necessary to which liquid is kept completely separate admittedly, while can also further reduce synthesis gas using water-coal-slurry charging
Temperature, improves efficiency of carbon con version to being close to 99%, and the water vapour of saving is used for generating electricity, can improve IGCC whole efficiencies about 0.2%～
0.3%.
Description of the drawings
Fig. 1 is overall structure diagram of the present utility model.
Fig. 2 is the schematic diagram of the gasification furnace of classification charging and slag tap.
Fig. 3 is gasification furnace first order arrangement of nozzles floor map.
Fig. 4 is gasification furnace first order nozzle section schematic diagram.
Fig. 5 is gasification furnace second level nozzle section schematic diagram.
Fig. 6 is gasification furnace Starting mode schematic diagram.
Specific embodiment
Referring to Fig. 1, this utility model includes that lower end is provided with the gasification furnace 9 of dreg removing system 13 and is opened in gasification furnace 9
The bottom-up first order nozzle 10 being connected with vaporizer 93, second level nozzle 11 and third level nozzle 12 at different level,
Wherein first order nozzle 10 is connected with high pressure oxygen and high steam 32, dry pulverized coal fuel system respectively, second level nozzle
11 are connected with water-coal-slurry supply system, third level nozzle 12 respectively with high steam 33 and dry pulverized coal fuel system phase
Even；
The crude synthesis gas 41 of described gasification furnace 9 export successively with waste heat boiler 14, cyclone separating cleaner unit 15, washing
Tower 16 and the connected synthesis gas 44 produced after purifying of desulfurizer 17；
Described separation cyclone scrubber 15 is collected a part of Jing fly ash carries device of the flying dust for obtaining 21 and is recycled to water coal
Slurry supply system, remaining flying dust 45 remove system, and the technique waste water Jing strippers 18 that scrubbing tower 16 is produced remove NH3And other suctions
The gas of receipts, then clarified tower 19 clarifies, concentration water containing solid waste Jing water containing the solid waste recirculation pump 20 after the process of clarified tower 19
Water-coal-slurry supply system is sent into, and the water after clarifying can then be sent into scrubbing tower 16 and the cooling water inlet circulation of dreg removing system 13 and make
With；
Described dreg removing system 13 becomes solid slag 43 using water cooling liquid slag 42 and discharges, in dreg removing system 13 containing solid
Waste water is delivered to clarification tower 19 and is clarified.
Referring to Fig. 2,3,4,5, gasification furnace of the present utility model 9 is overall to adopt cylindrical shape, by the pressure-bearing of concentrically circle arrangement
Vaporizer 93 inside shell 91 and bearing shell is constituted, and presses close to the chamber outer wall that gasifies and set between bearing shell 91 and vaporizer 93
Being equipped with water-cooling wall 92 prevents high temperature to cool down vaporizer 93, and vaporizer 93 is the master that coal and gasifying agent occur gasification reaction
Want container, 93 inside synthesis gas flow direction of vaporizer can be as shown in Figure 2 it is bottom-up, but be not limited to it is bottom-up, also
Can from up to down, or vaporizer is using horizontally disposed.It is as shown in Fig. 2 in gasification furnace different level, bottom-up, i.e., from
Synthesis gas flow direction upstream is respectively arranged with first order nozzle 10,11 He of second level nozzle to synthesis gas flow direction downstream
Third level nozzle 12.Horizontal arranging mode per first order jet nozzle is as shown in figure 3, typically should be arranged symmetrically using circumferential, i.e., four
Nozzle is respectively separated 90 ° of angles and is arranged on 9 outer wall circumference of gasification furnace, or can only arrange two nozzle pitch, 180 ° of angles.Such as
Shown in Fig. 4, its inside of nozzle for connecting dry pulverized coal fuel system has independent fuel channel 101 and independent gasification
Agent passage 102, gasifying agent passage 102 can be arranged on the outside of fuel channel 101.The nozzle of connection water-coal-slurry supply system is because of which
A kind of material i.e. water-coal-slurry is only conveyed into gasification furnace 9, then can adopt single channel form, as shown in Figure 5.The gasification furnace first order
Nozzle 10, gasification furnace second level nozzle 11, gasification furnace third level nozzle 12 are respectively provided with independent water cooling plant, and pass through pressure-bearing
Shell 91 and water-cooling wall 92 are directly entered vaporizer 93.Degassifying stove first order nozzle 10, must connection dry pulverized coal used as main burner
Beyond fuel system, gasification furnace second level nozzle 11, gasification furnace third level nozzle 12 can connect dry as secondary nozzle
Pulverized Coal supply system or water-coal-slurry supply system.
Wherein, dry pulverized coal fuel system includes coal dust bunker 1, coal dust exsiccator 2 and the coal dust lock hopper being sequentially connected
3, wherein coal dust lock hopper 3 is also connected with high pressure nitrogen 31, the dry pulverized coal 34 and that the outlet of coal dust lock hopper 3 is transported with high pressure nitrogen
First, the fuel channel 101 of three-level nozzle is connected.
Coal dust bunker 1 that water-coal-slurry supply system includes being sequentially connected, ore mill 4, water-coal-slurry agitator 5, water-coal-slurry mistake
The spray of water-coal-slurry 35 and second level nozzle 11 that the outlet of filter 6, water-coal-slurry bunker 7 and force (forcing) pump 8, wherein force (forcing) pump 8 is formed
In mouth water-coal-slurry passage 103 be connected, and ore mill 4 also distinguish by the road with fly ash carry device 21, water containing solid waste recirculation pump 20
It is connected.
Adopt the coal gasification and the cleaning system method of operation of flying dust and waste water recirculation are adopted shown in Fig. 1 for：It has been milled to one
The coal dust for determining granularity is delivered to coal dust bunker 1 and is stored in case continuous dosing, and pulverized coal particle average diameter must be less than 100 μm.A part
Coal dust is further dried removing moisture to water content 1-3wt% into coal dust exsiccator 2 by coal dust bunker 1, preferred 2wt%, then
Into coal dust lock hopper 3, now slightly above gasifier operation pressure 2.5-3.5MPa is pressurized to using high pressure nitrogen 31, preferably
3MPa, is then transported to 10 interior fuel channel 101 of first order nozzle on gasification furnace 9 using high pressure nitrogen and is injected into gas
Change stove 9, while the gasifying agent high pressure oxygen and water vapour 32 outside gasifying agent passage 102 from inside first order nozzle 10 enters gasification
There is chemical reaction with gasifying agent inside gasification furnace 9 and generate with CO, H in stove 9, coal dust2For the synthesis gas of main component, while releasing
Amplification quantity heat energy.Another part coal dust then enters ore mill 4 from coal dust bunker 1, while also adding in ore mill 4 from one
The treated concentration waste water containing a fixed solid in flying dust that point separation cyclone scrubber 15 is collected and clarification tower 19,
Its solids content is about 3-5%, and preferred 4wt%, these materials are further ground to solid average diameter in ore mill 4 and are less than
50 μm, while dispersant will be added to prevent solids accumulation.Stir subsequently into water-coal-slurry agitator 5, while adding steady
Determine agent, prevent solid particle from precipitating, prevent solid-liquid separation.Obtained homodisperse water-coal-slurry enters 6 mistake of water-coal-slurry filter
Larger granule is filtered, water-coal-slurry bunker 7 is entered back into and is stored, in case continuous dosing.Water coal slurry concentration is 64-68wt%, preferably
66%, the pressurized pump of water-coal-slurry 8 is forced into slightly above gasifier operation pressure, then by second level nozzle 11a on gasification furnace 9,
11b is injected into gasification furnace 9, and the fuel come in using first order nozzle 10 and gasifying agent occur the high temperature conjunction that chemical reaction is produced
Water in the water-coal-slurry come in into the heat that gas brings, second level nozzle 11 is vaporized first becomes steam there is provided gasifying agent, the
After the water-coal-slurry removing moisture that secondary nozzle 11 is come in, remaining solid includes coal dust and the solid particle containing uncompleted burned carbon
Can be used as fuel, the synthesis gas that produces after the fuel come in first order nozzle 10 and gasifying agent gasification reaction and incomplete
There is gasification reaction and further produce synthesis gas in the fuel of reaction and gasifying agent, so as to improve efficiency of carbon con version, improve gasification efficiency,
The temperature that gasification furnace 9 exports crude synthesis gas 41 can also finally be reduced.The crude synthesis gas 41 produced in gasification furnace 9 remove CO, H2With
It is outer also to contain a certain amount of flying dust (containing a certain amount of unburnt carbon), and NH3, H2The harmful gass such as S, palpus ECDC is into gas
Synthesis gas 44 after cleaning system process can just be purified is used for the gas turbine in Combined cycle gas-steam turbine system.Produce
Raw 41 Jing waste heat boilers of crude synthesis gas 14 reclaim heat and further cool down, and Jing separation cyclone scrubbers 15 are removed in crude synthesis gas
Flying dust, scrubbed tower 16 wash further remove containing trace solid and NH3Deng gas, the removing H of Jing desulfurizers 172S
Prepare the synthesis gas 44 after purification.Substantial amounts of slag can be produced in coal gasification course, in gasification furnace 9, slag is in liquid form
Dreg removing system 13 is drained into, while the unburnt carbon for also having meeting a small amount of drains into dreg removing system 13, dreg removing system 13 utilizes water to cold
But liquid slag 42 becomes solid slag 43, and the waste water in dreg removing system 13 then contains short grained solid slag and unburnt little
Grain carbon, needs are delivered to clarification tower 19 and are processed, and oarse-grained slag then needs timing to remove from dreg removing system 13.Separation cyclone scrubber
15 collect the flying dust part that obtains can Jing fly ash carries device 21 be recycled to ore mill 4, remaining flying dust 45 (accounts for total flying dust
System is then removed 70wt%), and the technique waste water that scrubbing tower 16 is produced contains certain NH because of which3, must Jing strippers 18 remove
NH3And other absorb gas, then deliver to clarification tower 19 clarified, while produce in gasification furnace dreg removing system 13 containing solid waste
Water is also delivered to clarification tower 19 in the lump and is processed, and water containing solid waste its solids content for entering to clarify tower 19 cannot be greater than 1.5wt%, clarified
Water after processing in tower 19 can return to scrubbing tower 16, dreg removing system 13 and recycle, and (the solids content of water containing solid waste after concentrating
About 3-5%, preferred 4wt%) ore mill 4 is recycled to prepare water-coal-slurry 35 by the recirculation pump of water containing solid waste 20 then.
The Starting mode of gasification furnace 9 is illustrated in figure 6 stepped starting, i.e., heating and gasifying room 93 is to assigned temperature, excellent in advance
1300-1500 DEG C is selected, and gasification reaction is carried out from the input material such as dry pulverized coal and oxygen, water vapour of first order nozzle 10, is treated thick conjunction
Maintenance level is reached into 41 yield of gas, i.e. fluctuation can then circulate flying dust and containing the aquatic product water-coal-slurry 35 of solid waste, lead to less than 5%
The input gasification furnace of second level nozzle 11 is crossed until gasification furnace stable operation.
As fuel (the coal and ash) content that gasification furnace 9 is entered by second level nozzle 11 has one relative to total fuel quantity
Individual optimum range, 35 dust burdening of water-coal-slurryCan be determined by formula (1), but its maximum must not exceed it is following both
Minima, i.e. formula (2)：A in () water-coal-slurry, maximum solid content deducts amount containing coal in water-coal-slurry 35；The dedusting of (b) cyclone separating
15 maximum of device except in dust quantity is deducted 9 total coal amount of vaporized stove ash component be changed into the amount of flying dust.In formula (1)Respectively
For Jing first order nozzle 10, mass flow of the second level nozzle 11 into the coal of gasification furnace 9, c are total conversion of carbon in gasification furnace 9
Rate, r are optimum of fuel (the coal and ash) content relative to total fuel quantity that gasification furnace 9 is entered by second level nozzle 11.Formula
(1) functional relationship, normally close in linear function, but its concrete value is with the different and different of coal.C in formula (2)solid
For the maximum solid content of water-coal-slurry 35,The mass flow of the water-coal-slurry 35 of gasification furnace 9 is entered for Jing second level nozzle 11,The mass flow of the coal of gasification furnace 9 is entered for Jing second level nozzle 11,It is maximum for cyclone separating cleaner unit 15
Dedusting mass flow,It is the total mass flow rate of the coal into gasification furnace 9, δ is the quality point that ash component becomes flying dust in coal
Number.9 load of gasification furnace is that adjusting for 41 yield of crude synthesis gas can pass through to adjust Jing second level nozzle 11 into the water of gasification furnace 9
Dust burdening in coal slurry 35 is carried out, which (being less than 3%) limited for the load regulation range of gasification furnace, is had an advantage in that
Adjust quick, do not affect the gasification reaction of the dry pulverized coal, oxygen and water vapour of the entrance of first order nozzle 10.If necessary to further
Increase 9 load of gasification furnace, then can put into dry pulverized coal by third level nozzle 12 and water vapour is completed into gasification furnace.And such as
Fruit further reduces by 9 load of gasification furnace, then can only reduce the water-coal-slurry flow by second level nozzle 11, or even reduce the first order
Dry pulverized coal that nozzle 10 is entered, oxygen and steam rates are realizing.
Claims (6)
1. the coal gasification of a kind of flying dust and waste water recirculation, cleaning system, it is characterised in that：Lower end is provided with dreg removing system
(13) gasification furnace (9) and be opened at gasification furnace (9) different level it is bottom-up be connected with vaporizer (93) first
Level nozzle (10), second level nozzle (11) and third level nozzle (12), wherein first order nozzle (10) respectively with high pressure oxygen and
High steam (32), dry pulverized coal fuel system are connected, and second level nozzle (11) is connected with water-coal-slurry supply system, and the 3rd
Level nozzle (12) is connected with high steam (33) and dry pulverized coal fuel system respectively；
Described gasification furnace (9) crude synthesis gas (41) outlet successively with waste heat boiler (14), cyclone separating cleaner unit (15),
Scrubbing tower (16) and the connected synthesis gas (44) produced after purifying of desulfurizer (17)；
Described separation cyclone scrubber (15) is collected a part of Jing fly ash carries device (21) of flying dust for obtaining and is recycled to water coal
Slurry supply system, remaining flying dust (45) remove system, and technique waste water Jing strippers (18) that scrubbing tower (16) is produced removes NH3And
Other gases for absorbing, then clarified tower (19) clarification, concentration water containing the solid waste Jing water containing solid waste after clarified tower (19) process
Recirculation pump (20) sends into water-coal-slurry supply system, and the water after clarifying then sends into the cold of scrubbing tower (16) and dreg removing system (13)
But water inlet is recycled；
Described dreg removing system (13) becomes solid slag (43) discharge using water cooling liquid slag (42), in dreg removing system (13)
Water containing solid waste delivers to clarification tower (19) clarification.
2. the coal gasification of flying dust according to claim 1 and waste water recirculation, cleaning system, it is characterised in that：Described
Gasification furnace (9) adopts cylindrical shape, by vaporizer (93) structure inside the bearing shell (91) and bearing shell of concentrically circle arrangement
Into pressing close to the chamber outer wall that gasifies between bearing shell (91) and vaporizer (93) and be provided with water-cooling wall (92).
3. the coal gasification of flying dust according to claim 1 and waste water recirculation, cleaning system, it is characterised in that：Described
It is arranged symmetrically using circumferential per first order jet nozzle, i.e., four nozzles are respectively separated 90 ° of angles and are arranged on gasification furnace (9) outer wall circumference,
Or two nozzle pitch, 180 ° of angles are arranged on gasification furnace (9) outer wall circumference.
4. the coal gasification of flying dust according to claim 1 and waste water recirculation, cleaning system, it is characterised in that：Described
Firstth, third level nozzle (10,12) be provided with the independent fuel channel (101) being connected with dry pulverized coal fuel system and
The independent gasifying agent passage (102) being arranged on the outside of fuel channel (101).
5. the coal gasification of flying dust according to claim 4 and waste water recirculation, cleaning system, it is characterised in that：Described
Dry pulverized coal fuel system includes coal dust bunker (1), coal dust exsiccator (2) and the coal dust lock hopper (3) being sequentially connected, wherein coal
Powder lock hopper (3) is also connected with high pressure nitrogen (31), the dry pulverized coal (34) that the outlet of coal dust lock hopper (3) is transported with high pressure nitrogen and the
First, the fuel channel (101) of three-level nozzle (10,12) is connected.
6. the coal gasification of flying dust according to claim 1 and waste water recirculation, cleaning system, it is characterised in that：Described
Water-coal-slurry supply system includes that the coal dust bunker (1) being sequentially connected, ore mill (4), water-coal-slurry agitator (5), water-coal-slurry are filtered
The water-coal-slurry (35) that the outlet of device (6), water-coal-slurry bunker (7) and force (forcing) pump (8), wherein force (forcing) pump (8) is formed is sprayed with the second level
In the nozzle of mouth (11) water-coal-slurry passage (103) be connected, and ore mill (4) also distinguish by the road with fly ash carry device (21), contain
Solid waste water recirculation pump (20) is connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| CN106190327A (en) * | 2016-09-12 | 2016-12-07 | 中国华能集团公司 | A kind of flying dust and the coal gasification of waste water recirculation, cleaning system and method |
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| CN111575064A (en) * | 2020-06-08 | 2020-08-25 | 山西潞安煤基清洁能源有限责任公司 | Ash removal method for high-sulfur coal after high-temperature gasification |
| CN113583716A (en) * | 2021-08-08 | 2021-11-02 | 中科聚信洁能热锻装备研发股份有限公司 | Double-circulation coal-to-liquid fluidized bed |
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