CN106753573B - A kind of peak load regulation network system and method for electric arc furnaces dual chamber iron bath coal gasification - Google Patents

A kind of peak load regulation network system and method for electric arc furnaces dual chamber iron bath coal gasification Download PDF

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CN106753573B
CN106753573B CN201611216203.XA CN201611216203A CN106753573B CN 106753573 B CN106753573 B CN 106753573B CN 201611216203 A CN201611216203 A CN 201611216203A CN 106753573 B CN106753573 B CN 106753573B
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coal
electric arc
arc furnaces
molten iron
gas
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CN106753573A (en
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于庆波
左宗良
秦勤
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Northeastern University China
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    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
    • C10J3/46—Gasification of granular or pulverulent flues in suspension
    • C10J3/48—Apparatus; Plants
    • C10J3/485—Entrained flow gasifiers
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
    • C10J3/57—Gasification using molten salts or metals
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J2200/00—Details of gasification apparatus
    • C10J2200/06—Catalysts as integral part of gasifiers
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J2300/00—Details of gasification processes
    • C10J2300/09—Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
    • C10J2300/0913—Carbonaceous raw material
    • C10J2300/093—Coal
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J2300/00—Details of gasification processes
    • C10J2300/09—Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
    • C10J2300/0953—Gasifying agents
    • C10J2300/0969—Carbon dioxide
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J2300/00—Details of gasification processes
    • C10J2300/09—Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
    • C10J2300/0983—Additives
    • C10J2300/0996—Calcium-containing inorganic materials, e.g. lime
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J2300/00—Details of gasification processes
    • C10J2300/12—Heating the gasifier
    • C10J2300/1246—Heating the gasifier by external or indirect heating
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J2300/00—Details of gasification processes
    • C10J2300/16—Integration of gasification processes with another plant or parts within the plant
    • C10J2300/164—Integration of gasification processes with another plant or parts within the plant with conversion of synthesis gas
    • C10J2300/1656—Conversion of synthesis gas to chemicals
    • C10J2300/1662—Conversion of synthesis gas to chemicals to methane (SNG)
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00—Technologies relating to chemical industry
    • Y02P20/10—Process efficiency

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Organic Chemistry (AREA)
  • Industrial Gases (AREA)

Abstract

The present invention provides a kind of peak load regulation network system and method for electric arc furnaces dual chamber iron bath coal gasification, the system comprises power supply units, molten iron electric arc furnaces, coal gasifier, the power supply unit connects the molten iron electric arc furnaces, the molten iron electric arc furnaces is connect by upper connector and lower connector with the coal gasifier, and in the molten iron electric arc furnaces upper connector and lower connector nozzle distance H1With the nozzle distance H of upper connector in the coal gasifier and lower connector3Meet following relationship: H3<0.953H1；The power supply unit is connect with power grid.The method is first to be heated molten iron in molten iron electric arc furnaces and coal gasifier using above system, its temperature is made to reach 1500 ~ 1600 DEG C；The coal dust and calcium carbonate mixed-powder carried again using preheating gasifying agent is sprayed into coal gasifier and carries out coal gasification reaction, and the heat of molten iron in coal gasifier and molten iron electric arc furnaces is absorbed；Coal gas of high temperature is finally used to prepare town gas or chemical products.

Description

A kind of peak load regulation network system and method for electric arc furnaces dual chamber iron bath coal gasification
Technical field
The present invention relates to the comprehensive utilizations of power grid electric energy, and in particular to a kind of power grid tune of electric arc furnaces dual chamber iron bath coal gasification Peak system and method.
Background technique
Currently, thermal power generation is the main generation mode in China.In recent years, with the improvement of people's living standard in our country and The adjustment of the industrial structure, whole society's power structure have changed a lot, and each bulk power grid peak-valley difference is caused to increase increasingly.Electric power Enterprise Supply Security, reliability and in terms of requirement it is also higher and higher.Network load distributes not at any time Regularity variation is presented in balance, power grid daily load at any time, and grid generation unit will meet the electricity consumption during peak valley two simultaneously Demand.Power grid low ebb load only has the 60% of peak load of grid, and power grid valley electricity cannot efficiently use.This causes in power grid Power cuts to limit consumption is needed when load peak, and then needs to cut off many units when low ebb.Generating set frequent start-stop not only will increase Energy consumption makes power equipment decrease in power generation efficiency, and economic benefit reduces, and will affect the service life of generating set.2014 300,000 kilowatts of China or more thermal power generating equipment annual occupancy is only 45%, and for today of energy shortage, this be will cause greatly Energy waste and resources loss.Currently, China's peak load regulation network ability is difficult to meet growing objective peak regulation demand, power grid tune The development of peak technology is significant for the peaking problem being on the rise.
According to the difference of peak regulation method, current peak regulation technique is broadly divided into two class of unit operation peak regulation and storage peak regulation. Unit operation peak regulation mainly includes the idle operation of few vapour, underrun and two-shift operation.Few vapour is idle, and to operate in electricity consumption low The load of unit is reduced to zero when paddy, unit is made to be in the idle state of rated speed rotation；Underrun passes through change The load of unit meets the peak regulation demand of power grid；Two-shift operation is according to the Distribution dynamics of the daily load curve of power grid, white Its unit operates normally, and night then shuts down 6-8h in network load low ebb.The idle operation of vapour and underrun exist less The serious problem of energy waste.The peak regulation method of two-shift operation then requires strictly equipment operation parameter, and safety is lower.
Storage peak regulation is the inexorable trend in China or even world power grid peak regulation.According to the difference of way of energy storage, power grid accumulation of energy Peak regulation can be divided into: (1) mechanical energy accumulator: water-storage, compressed air accumulation of energy；(2) thermal energy accumulation of energy: hot water heat storage boiler, combustion Gas cogeneration of heat and power, energy accumulation air conditioner technology；(3) electrochemistry accumulation of energy: battery, fuel cell；(4) chemical energy accumulation of energy: electrolytic aluminium, Water electrolysis hydrogen production.In current storage peak regulation technology, water-storage peak regulation technique, hot water heat storage boiler, gas cogeneration And energy accumulation air conditioner technology is limited by season and region；The slow flexibility of compressed air energy accumulating technique peak regulation speed is poor；It stores Battery, fuel cell storage peak regulation technology energy conversion efficiency is high, but memory capacity and generated output are the limits of its technology development Link processed.Compared with other energy accumulating techniques, chemical energy accumulation of energy has certain advantage, which is suitable for power grid kurtosis, Chemical products is prepared using valley period power, improves the utilization rate of grid equipment to the full extent, reduces peak-valley difference, is guaranteed efficient Efficient energy conversion.In the research and development of current chemical energy energy accumulating technique, water electrolysis hydrogen production technology has environmental protection, free of contamination excellent The hydrogen of high added value can be obtained using the technology for point, but its cost of investment is high, less economical；There is pollution in aluminum electrolysis technology Serious problem, and in today of aluminium excess capacity, it is not dominant that peak load regulation network is carried out by aluminum electrolysis technology.
Summary of the invention
In view of the problems of the existing technology, the present invention provides a kind of peak load regulation network system of electric arc furnaces dual chamber iron bath coal gasification System and method, the system and method are based on iron and bathe Coal Gasification Technology, i.e., prepare coal gas of high temperature using valley period power, and then prepare city City's coal gas/chemical industry synthesis gas belongs to a kind of new chemical energy energy accumulating technique.The technical solution adopted by the present invention are as follows:
A kind of peak load regulation network system of electric arc furnaces dual chamber iron bath coal gasification, including power supply unit, molten iron electric arc furnaces, coal gasification Furnace, the power supply unit connect the molten iron electric arc furnaces, the molten iron electric arc furnaces by upper connector and lower connector with it is described Coal gasifier connection, and in the molten iron electric arc furnaces upper connector and lower connector nozzle distance H1With the coal gasifier The nozzle distance H of middle upper connector and lower connector3Meet following relationship: H3<0.953H1；The power supply unit and power grid Connection.
Further, the system also includes heat exchanger and deduster, the heat exchanger connects the coal gasifier, described Deduster connects the heat exchanger.
Further, the power supply unit includes the peak valley modulator connecting with power grid, and the peak valley modulator successively connects Fuse, mutual inductor, transformer, short net are connect, the short Netcom crosses heating electrode and connects the molten iron electric arc furnaces.
Further, the heating electrode is graphite electrode.
Further, the coal gasifier is equipped with substance nozzle, gas vent, slag exit, and the substance nozzle is vertical It is set at the top of the coal gasifier；Or the substance nozzle is arranged in the coal gasifier side, and the substance nozzle Angle with the coal gasifier side wall is 10 ° ~ 45 °.
Further, the system can also include town gas processing unit, and the town gas processing unit includes Gas composition regulating device and syngas reactor, the gas composition regulating device are used to pass through vapor conversion reaction Adjust CO and H2Molar ratio be 1:3, the syngas reactor be used for by from the gas composition regulating device come out Gaseous mixture is completely converted into town gas by methanation reaction, and the gas composition regulating device connects the deduster.
A kind of peak load regulation network method of electric arc furnaces dual chamber iron bath coal gasification, be using above-mentioned peak load regulation network system, including with Lower step:
(1) peak load regulation network amount is determined according to the practical electricity consumption of paddy phase, power load is set, and determines the peak load regulation network The quantity of system；If being directly entered step (2) using 1 set of peak load regulation network system；If using more set peak load regulation network systems, Step (2) will be entered back into after more set peak load regulation network systems parallel connections；
(2) electric current is introduced into heating molten iron to molten iron electric arc furnaces and coal gasification in-furnace temperature in molten iron electric arc furnaces and reaches 1500 ~ 1600 DEG C and stabilization；
(3) gasifying agent is preheated to 200 ~ 400 DEG C, sprays into the coal dust and calcium carbonate that preheating gasifying agent carries from substance nozzle Mixed-powder carries out coal gasification reaction into coal gasifier, obtains coal gas of high temperature；
(4) coal gas of high temperature is used to prepare town gas or chemical products.
In the above method, the gasifying agent is CO2, vapor, richness CO2One of flue gas or a variety of mixing.
In the above method, it is described preheating gasifying agent carry coal dust and calcium carbonate mixed-powder, wherein gasifying agent, coal dust and The molar ratio of the O in C and gasifying agent in calcium carbonate is 1:0.9 ~ 1:1.5, CaCO3With the molar ratio of the S in coal dust be 1:1 ~ 2.5:1。
It is described that coal gas of high temperature is used to prepare town gas, detailed process in the above method are as follows: successively to pass through coal gas of high temperature Enter gas composition regulating device after heat exchanger heat exchange, deduster dedusting, is reacted with vapor and generate H2, and control CO and institute The H of generation2Molar ratio be 1:3；Gaseous mixture is sent into syngas reactor, methanation reaction acquisition town gas occurs.
Described that coal gas of high temperature successively exchanges heat through heat exchanger in the above method, heat transferring medium is water in the heat exchanger, is changed The vapor obtained after heat is used as gasifying agent.
In the above method, the chemical products include synthetic oil, methanol, ethylene glycol, oxo-alcohols, dimethyl ether and low-carbon alkene Hydrocarbon etc. is using CO as the product of primary raw material.
Reaction equation of the present invention are as follows:
CaCO3=CaO+CO2(g) =+110.39kJ/mol (1)
CaO+S+C=CaS+CO(g) ∆H2=-26.85kJ/mol (2)
C+CO2(g)=2CO(g) =+161.81kJ/mol (3)
C+H2O(g)=CO(g)+H2(g) =+135.0kJ/mol (4)
CO(g)+H2O(g)=CO2(g)+H2(g) ∆H5=+39.22kJ/mol (5)
CO(g)+3H2=CH4(g)+ H2O(g) ∆H6=-216.45kJ/mol (6)
CO2(g)+4H2(g)=CH4(g)+2H2O(g) ∆H6=-202.51kJ/mol (7)
∆H1~∆H7Indicate the reaction heat of reaction (1) ~ (7).
Coal gasification reaction is strong endothermic reaction, and using high temperature liquid iron as heat carrier, required heat is provided for coal gasification reaction Amount.Molten iron in molten bath also has catalytic action to coal gasification reaction, and coal gasification reaction rate can be improved, and improves gas composition.
Below by taking 50MW paddy phase Peak Load as an example, coal gas is bathed to electric arc furnaces dual chamber iron according to the conservation of mass and the conservation of energy Material needed for the peak load regulation network system and method for change and the product of generation are calculated, the method is as follows:
Design conditions: molten iron electric arc furnaces is ac arc furnace, input powerP a =50MW, electrothermal efficiency 78%, molten iron electricity Arc furnace molten iron inlet temperature is 1450 DEG C, and outlet temperature is 1550 DEG C, gasifying agent CO2, C and CO in coal gasifier in coal dust2 Molar ratio is 1:1, S and CaCO in coal dust3Molar ratio is 1:1.
The coal dust of selection is colm and two kinds of fat coal, and the Industrial Analysis and elemental analysis of two kinds of coals are as shown in table 1:
The Industrial Analysis and elemental analysis result of 1 colm of table and fat coal
When using fat coal, energy relationship existing for the system that be made of coal gasifier, molten iron electric arc furnaces are as follows:
Electrical heat input Q1The physical thermal Q that+coal dust is brought into2The physical thermal Q that+gasifying agent is brought into3+CaCO3The physical thermal brought into Q4 +CaSO3Chemical reaction generates hot Q5The physical thermal Q that=slag is taken out of6The physical thermal Q that+synthesis gas is taken out of7+ coal gasification reaction is inhaled Heat Q8+ CaCO3Decompose caloric receptivity Q9+ other heat loss Q10, wherein Q1~10Unit be KJ/S.
Into the energy of system:
Unit time electrical heat input Q1: Q1=50×0.78=39；
The physical thermal Q that unit time coal dust is brought into2: Q2=CcoalmcoalTcoal=1.21mcoal× 20(DEG C)=24.2mcoal；
Wherein, CcoalFor the specific heat of coal dust, KJ/ (kg DEG C)；mcoalQuality of pc for unit time loss is kg/s； TcoalFor air themperature, DEG C；
CO is consumed in unit time2Quality: mCO2=(85.87%mcoal/12-0.49%mcoal/ 32 × 2) × 44；Wherein mCO2 Unit is kg/s；
CaCO is consumed in unit time3Quality: mCaCO3= mcoal× 0.49% × 100/32, wherein mCaCO3Unit is kg/s；
The physical thermal Q that gasifying agent is brought into unit time3: Q3=CCO2 mCO2TCO2=0.996 mCO2× 200(DEG C)= 627.201mcoal；
Wherein, CCO2For the specific heat of carbon dioxide, KJ/ (kg DEG C)；TCO2For carbon dioxide temperature, DEG C；
CaCO is consumed in unit time3The physical thermal Q brought into4: Q4=CCaCO3mCaCO3TCaCO3=0.84mCaCO3× 20(DEG C)= 0.6854mcoal；
Wherein, CCaCO3For the specific heat for consuming calcium carbonate in the unit time, KJ/ (kg DEG C)；TCaCO3For calcium carbonate temperature, ℃；
CaS chemical reaction generates hot Q in unit time5:
Q5=ms/Ms×ΔH2=0.49%mcoal/0.032×26.85=0.0041mcoal；
Wherein msIndicate the quality that CaS is generated in the unit time, kg/s；MsIndicate the molal weight of CaS, kg/mol；
Leave system capacity:
The lime-ash quality that reaction generates in unit time: mslag= mCoal×11.73%=0.1173 mCoal
The physical thermal Q that unit time lime-ash is taken out of6: Q6=CslagmslagTIron=0.1173mcoal× 1450(DEG C)= 156.4782mcoal；
Wherein, CslagFor the specific heat of slag, KJ/ (kg DEG C)；TIronFor molten iron temperature, DEG C；
Coal gasification reaction conversion ratio is calculated by 100%, in synthesis gas:
mCO=2×mC×28/12= mCoal×85.87%×56/12=4.0073 mCoal；
Wherein, mCOTo generate CO mass, kg/s in the unit time；mCFor the quality of pc consumed in the unit time, kg/s；
The physical thermal Q that synthesis gas is taken out of in unit time7: Q7=CCOmCOTCO=1.16×mCO× 1450(DEG C)= 6740.2225mcoal；
Wherein, CCOFor the specific heat of CO, KJ/ (kg DEG C)；TCOFor CO temperature, DEG C；
Consumption coal gasification reaction caloric receptivity Q in unit time8:
Q8=mc/Mc×ΔH3=(0.8587mcoal/0.012-0.0049mcoal/0.0032)×161.81/1000= 11578.854mcoal；
Wherein mcIndicate the phosphorus content of consumption coal dust in the unit time, kg/s；McIndicate the molal weight of carbon, kg/mol；
CaCO is consumed in unit time3Decompose caloric receptivity Q9:
Q9= mCaCO3/M CaCO3×ΔH1=0.49%mcoal/0.012×110.39=45.3168mcoal；
Wherein, mCaCO3Indicate the quality of consumption calcium carbonate in the unit time, kg；M CaCO3Indicate the molal weight of calcium carbonate, kg/mol；
Other heat loss are taken as 5%, i.e. Q10= (Q1+ Q2+ Q3+ Q4+Q5)×5%；
By the conservation of energy, can obtain: Q1+ Q2+ Q3+ Q4+ Q5= Q6+ Q7+ Q8+Q9+Q10；
It finally obtains: mCoal=2.0167kg/s=7.26t/h
Then with CO2When for gasifying agent, MaterialBalance Computation table is as shown in table 2:
Table 2 is with CO2For the MaterialBalance Computation table of gasifying agent
Similarly proper it can use H2O makees MaterialBalance Computation table when gasifying agent, as shown in table 3:
Table 3 is with H2O is the MaterialBalance Computation table of gasifying agent
The case where below to synthesis gas for when producing town gas, carries out Material calculation:
Design conditions: fat coal uses CO2The synthesis gas generated when as gasifying agent；
CO and H in synthesis gas2Gross mass be 29.48t/h, mainly react in synthesis gas converting means (5) will CO and H2Molar ratio be adjusted to 1:3.
Thus, it is supposed that the amount for being passed through vapor is X t/h, then according to CO and H2Required molar ratio can obtain:
nCO/nH2=(mCO/28-X/18)/(X/18+nCoal-H2)=1/3
Wherein, nco indicates the amount that the substance of CO is generated in the unit time, mol/s；NH2 indicates to generate H2 in the unit time Substance amount, mol/s；MCO indicates the quality that CO is generated in the unit time, kg/s；MH2 indicates to generate H2's in the unit time Quality, kg/s, ncoal-H2 indicate pyrolysis of coal in the unit time, mol/s.It can thus be concluded that the vapor in synthesis gas converting means Demand X=13.92t/h, so by m in transformed synthesis gasCO=7.44t/h, mH2=1.59t/h。
It can thus be concluded that the amount for generating methane is 4.25t/h.
The additive amount of vapor can similarly be obtained in the case of remaining in gas composition regulating device and final generate CH4's Amount, as shown in table 4:
The mass balance table that 4 methane of table generates
The invention has the benefit that the present invention is adaptable strong, not by season, territory restriction, peak modulation capacity is strong, rings Should be fast, the advantages that efficient energy conversion is high, environmental protection and economy；Not only it solves the problems, such as the peak load regulation network being on the rise, but also height can be generated Quality coal gas/synthesis gas, generated coal gas/synthesis gas in addition to can directly as industrial chemicals carry out chemical products synthesis other than, It can also be used to produce town gas, facilitate the status for alleviating China's gas supply shortage.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of peak load regulation network system of the invention.
Fig. 2 is that molten iron circulates principle in molten iron electric arc furnaces and coal gasifier in peak load regulation network system of the invention Scheme, wherein H1For the nozzle distance of upper connector in molten iron electric arc furnaces and lower connector, H2For molten iron level in molten iron electric arc furnaces with Upper connector nozzle distance, H3For the nozzle distance of upper connector in coal gasifier and lower connector, H4For molten iron in coal gasifier Liquid level and upper connector nozzle distance.
Fig. 3 is the molten iron electric arc furnaces of peak load regulation network system of the invention and a kind of structural schematic diagram of coal gasifier.
Fig. 4 is the molten iron electric arc furnaces of peak load regulation network system of the invention and another structural schematic diagram of coal gasifier.
In Fig. 2 ~ 4,1- power grid, 2- peak valley modulator, 3- fuse, 4- mutual inductor, 5- transformer, the short net of 6-, 7- molten iron Electric arc furnaces, 8- coal gasifier, 9- heat exchanger, 10- deduster, 11- gas composition regulating device, 12- syngas reactor, 13- heats electrode, 14- iron bath, 15- lower connector, 16- upper connector, 17- substance nozzle, 18- gas vent, 19- slag Layer, 20- slag exit.
Specific embodiment
The present invention is described in further details with specific embodiment with reference to the accompanying drawing, described is to solution of the invention It releases rather than limits.
Fig. 1 provides the structural schematic diagram of peak load regulation network system of the invention, and the peak load regulation network system includes for Denso It sets, molten iron electric arc furnaces 7, coal gasifier 8, heat exchanger 9 and deduster 10, the power supply unit connect the molten iron electric arc furnaces 7, institute It states molten iron electric arc furnaces 7 to connect by upper connector 16 and lower connector 15 with the coal gasifier 8, and the molten iron electric arc furnaces The nozzle distance H of upper connector and lower connector in 71With the nozzle distance of upper connector in the coal gasifier and lower connector H3Meet following relationship: H3<0.953H1；The coal gasifier is equipped with substance nozzle 17, gas vent 18, slag exit 20, the substance nozzle is vertically installed at the top of the coal gasifier (as shown in Figure 3)；Or the substance nozzle is arranged in institute Coal gasifier side is stated, and the angle of the substance nozzle and the coal gasifier side wall is 10 ° ~ 45 ° (as shown in Figure 4)；Institute Power supply unit is stated to connect with power grid 1；The heat exchanger 9 connects the coal gasifier 8, and the deduster 10 connects the heat exchanger 9。
The power supply unit includes the peak valley modulator 2 connecting with power grid 1, and the peak valley modulator 2 is sequentially connected fusing Device 3, mutual inductor 4, transformer 4, short net 6, the short net 6 connect the molten iron electric arc furnaces 7, the heating by heating electrode 13 Electrode is graphite electrode.
The also settable town gas processing unit of the system, the town gas processing unit includes gas composition tune Regulating device 11 and syngas reactor 12, the gas composition regulating device 11 are used to adjust CO by vapor conversion reaction With H2Molar ratio be 1:3, the syngas reactor 12 for will from the gas composition regulating device come out mixing Gas is completely converted into town gas by methanation reaction, and the gas composition regulating device 11 connects the deduster 10.
What Fig. 2 provided molten iron in molten iron electric arc furnaces described in above system and coal gasifier circulates schematic diagram.It is molten Iron arc furnace is connect with coal gasifier by upper and lower connecting tube, and upper connector is horizontal tube, and lower connector is tipping tube.Molten iron It is constantly heated in molten iron electric arc furnaces, and the heat release in coal gasifier causes the close of bath to generate temperature gradient Spend gradient.Molten iron electric arc furnaces bath temperature is higher than coal gasifier bath temperature.It is deposited between molten iron electric arc furnaces and coal gasifier molten bath Pressure is lower than pressure at gas burner upper connector nozzle at molten iron electric arc furnaces upper connector mouth；Molten iron electric arc furnaces lower connector pipe Pressure is higher than pressure at coal gasifier lower connector nozzle at mouthful.
Embodiment 1
A kind of peak load regulation network method of electric arc furnaces dual chamber iron bath coal gasification, is to use peak load regulation network system as shown in Figure 1, The system uses molten iron electric arc furnaces and coal gasifier as shown in Figure 3: molten iron capacity 150t, basal diameter 2m are highly 6m, molten iron depth are 3.1m；The peak load regulation network method the following steps are included:
(1) peak load regulation network amount is determined according to the practical electricity consumption of paddy phase, power load is set；
(2) electric current is introduced in molten iron electric arc furnaces and heats molten iron, wherein molten iron electric arc in-furnace temperature is 1550 DEG C, coal gasification In-furnace temperature is 1450 DEG C, and molten iron is formed between molten iron electric arc furnaces and coal gasifier and circulated；
(3) by gasifying agent CO2200 DEG C are preheated to, sprays into preheating CO from substance nozzle2The high-quality anthracite powder and carbon of carrying Sour calcium mixed-powder carries out coal gasification reaction into coal gasifier, and wherein pulverized coal flow is 7.26t/h, CO2Flow is 22.85t/ H, CaCO3Powder is 0.3t/h, coal dust, calcium carbonate and CO2Contained in C and CO2In O molar ratio be 1:1, CaCO3With coal The molar ratio of S in powder is 1:1, obtains temperature in 1000 DEG C or more of coal gas of high temperature, wherein CO and H2Yield be 26700m3/ H, 562m3/h；The slag generated in coal gasifier is discharged by slag exit；
(4) coal gas of high temperature is subjected to waste heat recycling by heat exchanger, in heat exchanger, coal gas of high temperature exchanges heat with water, Gas temperature can be down to 300 DEG C or so, and the coal gas after cooling enters purifying and dedusting in deduster.
There are two types of approach for clean gas after dedusting: one side clean gas can carry out chemical industry production directly as industrial chemicals Product synthesis；Another aspect clean gas enters gas composition regulating device, reacts with vapor and generates H2, and control CO and institute The H of generation2Molar ratio be 1:3；Gaseous mixture is sent into syngas reactor, methanation reaction (reaction equation (6), (7)) occurs Town gas is obtained, methane production amount is 5950m3/h。
In the above method, the chemical products include synthetic oil, methanol, ethylene glycol, oxo-alcohols, dimethyl ether and low-carbon alkene Hydrocarbon etc. is using CO as the product of primary raw material.
Embodiment 2
A kind of peak load regulation network method of electric arc furnaces dual chamber iron bath coal gasification, is to use peak load regulation network system as shown in Figure 1, The system is used such as Fig. 4 molten iron electric arc furnaces shown and coal gasifier: molten iron capacity 150t, basal diameter 2m, are highly 6m, Molten iron depth is 3.1m, and the angle of substance nozzle and coal gasifier side wall is 30 ° in coal gasifier；The peak load regulation network side Method the following steps are included:
(1) peak load regulation network amount is determined according to the practical electricity consumption of paddy phase, power load is set；
(2) electric current is introduced in molten iron electric arc furnaces and heats molten iron, wherein molten iron electric arc in-furnace temperature is 1500 DEG C, coal gasification In-furnace temperature is 1400 DEG C, and molten iron is formed between molten iron electric arc furnaces and coal gasifier and circulated；
(3) gasifying agent vapor is preheated to 400 DEG C, sprays into the high-quality anthracite that preheating vapor carries from substance nozzle Powder and calcium carbonate mixed-powder carry out coal gasification reaction into coal gasifier, and wherein pulverized coal flow is 8.17t/h, vapor flow For 10.53t/h, CaCO3Powder is that the molar ratio of 0.34t/h, C contained in coal dust and calcium carbonate and the O in vapor are 1: 1, CaCO3It is 1:1 with the molar ratio of the S in coal dust, obtains temperature in 1000 DEG C or more of coal gas of high temperature, wherein CO and H2Production Amount is 13096m3/ h, 13708m3/h；The slag generated in coal gasifier is discharged by slag exit；
(4) coal gas of high temperature is subjected to waste heat recycling by heat exchanger, in heat exchanger, coal gas of high temperature exchanges heat with water, Gas temperature can be down to 300 DEG C or so, and the coal gas after cooling enters purifying and dedusting in deduster.
There are two types of approach for clean gas after dedusting: one side clean gas can carry out chemical industry production directly as industrial chemicals Product synthesis；Another aspect clean gas enters gas composition regulating device, reacts with vapor and generates H2, and control CO and institute The H of generation2Molar ratio be 1:3；Gaseous mixture is sent into syngas reactor, methanation reaction (reaction equation (6), (7)) occurs Town gas is obtained, methane production amount is 6692m3/h。
In the above method, the chemical products include synthetic oil, methanol, ethylene glycol, oxo-alcohols, dimethyl ether and low-carbon alkene Hydrocarbon etc. is using CO as the product of primary raw material.
Embodiment 3
A kind of peak load regulation network method of electric arc furnaces dual chamber iron bath coal gasification, is using more set peak load regulation networks as shown in Figure 1 System, more set systems are all made of such as Fig. 3 molten iron electric arc furnaces shown and coal gasifier: molten iron capacity 150t, basal diameter are 2m is highly 6m, and molten iron depth is 3.1m；The peak load regulation network method the following steps are included:
(1) peak load regulation network amount is determined according to the practical electricity consumption of paddy phase, power load is set, and will cover peak load regulation network system more System is in parallel；
(2) electric current is introduced in parallel system and heats molten iron in each molten iron electric arc furnaces, wherein molten iron electric arc in-furnace temperature It is 1500 DEG C, coal gasification in-furnace temperature is 1400 DEG C, and molten iron is formed between molten iron electric arc furnaces and coal gasifier and circulated.
(3) gasifying agent vapor is preheated to 400 DEG C, sprays into the high-quality anthracite that preheating vapor carries from substance nozzle Powder and calcium carbonate mixed-powder carry out coal gasification reaction into coal gasifier, and wherein pulverized coal flow is 8.17t/h, vapor flow For 10.53t/h, CaCO3Powder is that the molar ratio of 0.34t/h, C contained in coal dust and calcium carbonate and the O in vapor are 1: 1, CaCO3It is 1:1 with the molar ratio of the S in coal dust, obtains temperature in 1000 DEG C or more of coal gas of high temperature, wherein CO and H2Production Amount is 13096m3/ h, 13708m3/h；The slag generated in coal gasifier is discharged by slag exit；
(4) coal gas of high temperature is subjected to waste heat recycling by heat exchanger, in heat exchanger, coal gas of high temperature exchanges heat with water, Gas temperature can be down to 300 DEG C or so, and the coal gas after cooling enters purifying and dedusting in deduster.
There are two types of approach for clean gas after dedusting: one side clean gas can carry out chemical industry production directly as industrial chemicals Product synthesis；Another aspect clean gas enters gas composition regulating device, reacts with vapor and generates H2, and control CO and institute The H of generation2Molar ratio be 1:3；Gaseous mixture is sent into syngas reactor, methanation reaction (reaction equation (6), (7)) occurs Town gas is obtained, methane production amount is 6692m3/h。
In the above method, the chemical products include synthetic oil, methanol, ethylene glycol, oxo-alcohols, dimethyl ether and low-carbon alkene Hydrocarbon etc. is using CO as the product of primary raw material.

Claims (6)

1. a kind of peak load regulation network system of electric arc furnaces dual chamber iron bath coal gasification, it is characterised in that including power supply unit, molten iron electric arc Furnace, coal gasifier, the power supply unit connect the molten iron electric arc furnaces, and the molten iron electric arc furnaces passes through upper connector and lower connection Pipe connect with the coal gasifier, and in the molten iron electric arc furnaces upper connector and lower connector nozzle distance H1With it is described The nozzle distance H of upper connector and lower connector in coal gasifier3Meet following relationship: H3<0.953H1；It is described for Denso It sets and is connect with power grid；
The system also includes heat exchanger and deduster, the heat exchanger connects the coal gasifier, and the deduster connects institute State heat exchanger；
The power supply unit includes the peak valley modulator connecting with power grid, and the peak valley modulator is sequentially connected fuse, mutual inductance Device, transformer, short net, the short Netcom cross heating electrode and connect the molten iron electric arc furnaces, and the heating electrode is graphite electrode.
2. a kind of peak load regulation network system of electric arc furnaces dual chamber iron bath coal gasification according to claim 1, it is characterised in that institute Coal gasifier is stated equipped with substance nozzle, gas vent, slag exit, the substance nozzle is vertically installed in the coal gasification furnace roof Portion；Or the substance nozzle is arranged in the coal gasifier side, and the substance nozzle and the coal gasifier side wall Angle is 10 °~45 °.
3. a kind of power grid tune of electric arc furnaces dual chamber iron bath coal gasification described in any one claim according to claim 1~2 Peak system, it is characterised in that the system can also include town gas processing unit, and the town gas processing unit includes Gas composition regulating device and syngas reactor, the gas composition regulating device are used to pass through vapor conversion reaction Adjust CO and H2Molar ratio be 1:3, the syngas reactor be used for by from the gas composition regulating device come out Gaseous mixture is completely converted into town gas by methanation reaction, and the gas composition regulating device connects the deduster.
4. a kind of peak load regulation network method of electric arc furnaces dual chamber iron bath coal gasification, is using peak load regulation network system as claimed in claim 3 System, it is characterised in that the following steps are included:
(1) peak load regulation network amount is determined according to the practical electricity consumption of paddy phase, power load is set, and determines the peak load regulation network system Quantity；If being directly entered step (2) using 1 set of peak load regulation network system；If, will be more using more set peak load regulation network systems Step (2) are entered back into after set peak load regulation network system is in parallel；
(2) will electric current introduce heating molten iron to molten iron electric arc furnaces and coal gasification in-furnace temperature in molten iron electric arc furnaces reach 1500~ 1600 DEG C and stabilization；
(3) gasifying agent is preheated to 200~400 DEG C, sprays into the coal dust of preheating gasifying agent carrying from substance nozzle and calcium carbonate mixes It closes powder and carries out coal gasification reaction into coal gasifier, obtain coal gas of high temperature；
(4) coal gas of high temperature is used to prepare town gas or chemical products, is used to prepare the detailed process of town gas are as follows: will Coal gas of high temperature successively enters gas composition regulating device after heat exchanger heat exchange, deduster dedusting, and generation is reacted with vapor H2, and control CO and H generated2Molar ratio be 1:3；Gaseous mixture is sent into syngas reactor, methanation reaction occurs Obtain town gas.
5. a kind of peak load regulation network method of electric arc furnaces dual chamber iron bath coal gasification according to claim 4, it is characterised in that institute Stating gasifying agent is CO2, vapor, richness CO2One of flue gas or a variety of mixing.
6. a kind of peak load regulation network method of electric arc furnaces dual chamber iron bath coal gasification according to claim 4, it is characterised in that institute Coal dust and calcium carbonate mixed-powder that preheating gasifying agent carries are stated, wherein in the C and gasifying agent in gasifying agent, coal dust and calcium carbonate O molar ratio be 1:0.9~1:1.5, CaCO3Molar ratio with the S in coal dust is 1:1~2.5:1.
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CN2879079Y (en) * 2006-11-17 2007-03-14 郑颖杰 Refined material no-power-cut collecting type high-efficiency AC arc oven
CN102518516A (en) * 2011-12-14 2012-06-27 华北电力大学 Integral compressed air energy storage and coal gasification power generation system and integrated power generation method

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2879079Y (en) * 2006-11-17 2007-03-14 郑颖杰 Refined material no-power-cut collecting type high-efficiency AC arc oven
CN102518516A (en) * 2011-12-14 2012-06-27 华北电力大学 Integral compressed air energy storage and coal gasification power generation system and integrated power generation method

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