CN106753579B - A kind of solid thermal carriers coal gasification electrical thermal storage system and method - Google Patents

A kind of solid thermal carriers coal gasification electrical thermal storage system and method Download PDF

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CN106753579B
CN106753579B CN201611216387.XA CN201611216387A CN106753579B CN 106753579 B CN106753579 B CN 106753579B CN 201611216387 A CN201611216387 A CN 201611216387A CN 106753579 B CN106753579 B CN 106753579B
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coal
gas
coal gasification
ash
fluid bed
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CN106753579A (en
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于庆波
杨凡
秦勤
段文军
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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
    • C10J3/54—Gasification of granular or pulverulent fuels by the Winkler technique, i.e. by fluidisation
    • C10J3/56—Apparatus; Plants
    • 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
    • C10J3/72—Other features
    • 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
    • C10J2300/12—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
    • C10J2300/1671—Integration of gasification processes with another plant or parts within the plant with the production of electricity

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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 solid thermal carriers coal gasification electrical thermal storage system and method, the system comprises power supply unit, fluid bed powder coal gasification furnace, cyclone dust collectors, ash discharge sorter and fine ash collecting chambers, the power supply unit connects the fluid bed powder coal gasification furnace, the fluid bed powder coal gasification furnace includes furnace body, the furnace interior is equipped with metal thermal carrier, and outside is equipped with heating element；The furnace body gas vent connects the cyclone dust collectors, the feed opening of the cyclone dust collectors connects the feeding inlet of the ash discharge sorter, the cinder outlet of the ash discharge sorter is connect with the return port, and the fine ash outlet of the ash discharge sorter is connect with the fine ash collecting chamber.The method is using above system, and first heated fluidized bed coal gasification in-furnace temperature reaches 800 ~ 1300 DEG C；Coal gasification reaction is carried out in coal gasifier with preheating gasifying agent entrainment coal dust and calcium carbonate mixed-powder again；Coal gas of high temperature is finally used to prepare town gas or chemical products.

Description

A kind of solid thermal carriers coal gasification electrical thermal storage system and method
Technical field
The present invention relates to the comprehensive utilizations of power grid electric energy, and in particular to a kind of solid thermal carriers coal gasification electrical thermal storage system And method.
Background technique
Currently, thermal power generation is the main generation mode in China, and will not change within following a period of time.But it is close Nian Lai, with the improvement of people's living standard in our country with the adjustment of the industrial structure, the power structure of the whole society has occurred very big Variation, causes the peak-valley difference of each bulk power grid to increase increasingly.And the regulating power of power grid itself is weaker, therefore installs in generating set When capacity is difficult to meet the peak of power consumption of network load, it has to take the mode of power cuts to limit consumption to guarantee the stabilization of generating set Operation, and in low power consumption, then it needs to shut down many generating sets.For thermal power generation, generating set is frequently opened Stop not only increase energy consumption, while can also shorten the service life of generating set, makes the decrease in power generation efficiency of power equipment, make Economic benefit reduces.The thermal power generating equipment annual occupancy in 300,000 kilowatts of China in 2014 or more is only 45%, this endangers to the energy Today that machine is got worse is a kind of great energy waste and resources loss.Therefore, suitable peak load regulation network technology pair is taken Have great importance in the peaking problem being on the rise at present.
According to the difference of peak regulation method, peak regulation technique can be divided into unit operation peak regulation and two kinds of storage peak regulation at present.
Unit operation peak regulation technique mainly has the idle operation of few vapour, underrun and two-shift operation.Wherein lack vapour without The load of unit is reduced to zero when function operates in low power consumption, unit is made to be in the idle state of rated speed rotation；It is low negative Lotus operation meets the peak regulation demand of power grid by changing the load of unit；Two-shift operation is according to the daily load curve of power grid point With rule, generating set on daytime is operated normally, and night then shuts down 6~8h in low power consumption.These three unit operation peak regulation skills Though art is widely used in current each Large-scale fire-electricity unit because of easy to operate, technically reliable and peak regulation significant effect, all deposit In respective defect.Few vapour is idle and the operation energy consumption of low load operating mode is high, energy waste is serious.Two-shift operation mode Requirement to the operating parameter of equipment is extremely stringent, and safety is lower.
The energy that extra electric energy when storage peak regulation is by by low power consumption is converted to other forms carries out storage or direct It utilizes, the energy of storage is converted to electric energy for users to use again in peak of power consumption, makes extra electric energy when low power consumption, turn Become high value electric energy when peak of power consumption, to achieve the purpose that peak-clipping and valley-filling.According to the difference of way of energy storage, storage peak regulation Technology can be divided into mechanical energy accumulator, thermal energy accumulation of energy, electrochemistry accumulation of energy and chemical energy accumulation of energy.
Extra electric energy when mechanical energy accumulator is by low power consumption, which is converted to machinery, can be carried out storage, in peak of power consumption by machine Tool can be converted to electric energy, mainly include water-storage and compressed air accumulation of energy.It is more when wherein water-storage is using low power consumption Remaining electrical energy drive pumping for water pump is discharged water by reservoir in peak of power consumption and the hydraulic turbine is driven to generate electricity into reservoir.The storage Energy technology has many advantages, such as that system is reliable, accumulation of energy capacity is big and long service life, but because being limited larger, nothing by season and region Method large-scale promotion.Extra electric energy when compressed air accumulation of energy is using low power consumption compresses air, then in electricity consumption height Compressed air-driven steam turbine power generation is discharged when peak.The operating cost of the technology is low, but has energy conversion rate lower, flexibility The disadvantages of poor with economy.
Extra electric energy when thermal energy accumulation of energy is by low power consumption is converted to thermal energy and carries out storage or directly utilize, in peak of power consumption When convert heat into electric energy again, mainly include hot water heat storage boiler, gas cogeneration and energy accumulation air conditioner technology.Thermal energy accumulation of energy Has many advantages, such as technology maturation, economic and environment-friendly but larger by season and territory restriction, therefore can not large-scale use.
Electrochemistry accumulation of energy using battery or fuel cell by low power consumption when extra electric energy store, in electricity consumption height Electric energy is discharged again when peak, the energy conversion rate of the way of energy storage is high, but storage volume and generated output are its large-scale uses With the limiting factor of development.
Extra electric energy when chemical energy accumulation of energy is using low power consumption carries out the preparation of chemical products.With other way of energy storage phases Than chemical energy accumulation of energy can improve the utilization rate of grid equipment to the full extent, reduce peak-valley difference, guarantee efficient energy conversion Rate.In current chemical energy energy accumulating technique, water electrolysis hydrogen production technology has environmental protection, and high added value can be obtained in free of contamination advantage Hydrogen, but the technological investment is at high cost, less economical；Aluminum electrolysis technology environmental pollution is serious, and in aluminium excess capacity Today, by aluminum electrolysis technology carry out peak load regulation network do not have advantage.
Therefore, it is necessary to one kind neither by season and territory restriction, and can generate preferable economic benefit it is efficient, safe, The electrical thermal storage peak regulation technique of environmental protection.
Summary of the invention
In view of the problems of the existing technology, the present invention provides a kind of solid thermal carriers coal gasification electrical thermal storage system and side Electric-heating technology and solid thermal carriers Coal Gasification Technology are coupled by method, the system and method, more when using low power consumption Remaining electric energy, the metal thermal carrier in heated fluidized bed powder coal gasification furnace provide enough heats for coal gasification course, realize by electricity The Efficient Conversion of chemical energy can be arrived.The technical solution adopted by the present invention are as follows:
A kind of solid thermal carriers coal gasification electrical thermal storage system, including power supply unit, fluid bed powder coal gasification furnace, whirlwind remove Dirt device, ash discharge sorter and fine ash collecting chamber, the power supply unit connect the fluid bed powder coal gasification furnace, the fluidized bed powder Coal gasifier includes furnace body, and the furnace interior is equipped with metal thermal carrier, and outside is equipped with heating element；The furnace body is equipped with coal dust Entrance, lime stone entrance, gasification agent inlet, return port and gas vent；The gas vent connects the cyclone dust collectors, institute The feed opening for stating cyclone dust collectors connects the feeding inlet of the ash discharge sorter, the cinder outlet of the ash discharge sorter with it is described The fine ash outlet of return port connection, the ash discharge sorter is connect with the fine ash collecting chamber；The ash discharge sorter is equipped with cloth Aerofoil, for filtering out fine ash particle；The power supply unit is connect with the heating element and power grid respectively.
Further, the system also includes flue gas heat-exchange unit, waste heat boiler and deduster, the flue gas heat-exchange unit difference The cyclone dust collectors and the waste heat boiler are connected, the waste heat boiler connects the deduster.
Further, heat exchanger is equipped in the fine ash collecting chamber, the outlet of the fine ash collecting chamber connects ash cellar.
Further, the heating element is induction coil or resistance-type calandria, when heating element is induction coil, The metal thermal carrier is the magnetic metal bead containing alkaline element of 0.5~4mm of diameter；When heating element is resistance When formula calandria, the metal thermal carrier is the prill containing alkaline element of 0.5~4mm of diameter.
Further, the system can also include town gas processing unit, and the town gas processing unit includes Gas composition regulating device and methanation device, the gas composition regulating device connects the deduster, for passing through Water-gas shift reaction adjusts CO and H in coal gas of high temperature2Molar ratio be 1: 3, the methanation device is for will be from the synthesis The gaseous mixture that gas component adjusting device comes out is completely converted into town gas by methanation reaction.
A kind of solid thermal carriers coal gasification electrical thermal storage method is using above system, comprising the following steps:
(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 energy introducing fluid bed powder coal gasification furnace internal heating metal heat carrier to temperature is reached 800~1300 DEG C simultaneously It keeps constant；
(3) coal dust and lime stone are passed through into coal powder entrance respectively and lime stone entrance is added to fluid bed powder coal gasification furnace It is interior, will be preheated to 200~400 DEG C of gasifying agent be passed through by gasification agent inlet it is anti-to coal gasification is carried out in fluid bed powder coal gasification furnace It answers, in reaction process, the gaseous mixture of entrained solids reaction mass constantly divides under the action of cyclone dust collectors and ash discharge sorter Coal gas of high temperature is obtained after separating out cinder and fine ash, wherein cinder is back in fluid bed powder coal gasification furnace that continue coal gasification anti- It answers, fine ash enters ash cellar after passing through fine ash collecting chamber；
(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, the gasification Fluidising air velocity of the agent in fluid bed powder coal gasification furnace is 0.5~8m/s.
In the above method, the molar ratio of the O in C and gasifying agent in the gasifying agent, lime stone and coal dust is 1: 0.9~ 1: 1.5, CaCO3Molar ratio with the S in coal dust is 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 that 250~300 DEG C of vapor react life with temperature At H2, and control CO and H generated in coal gas of high temperature2Molar ratio be 1: 3；Gaseous mixture is sent into methanation device in 250 ~300 DEG C of generation methanation reactions obtain town gas.
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) ΔH1=+110.39kJ/mol (1)
CaO+S+C=CaS+CO (g) Δ H2=-26.85kJ/mol (2)
C+CO2(g)=2CO (g) Δ H3=+161.81kJ/mol (3)
C+H2O (g)=CO (g)+H2(g) ΔH4=+135.0kJ/mol (4)
CO(g)+H2O (g)=CO2(g)+H2(g) ΔH5=+39.22kJ/mol (5)
CO(g)+3H2=CH4(g)+H2O(g) ΔH6=-216.45kJ/mol (6)
CO2(g)+4H2(g)=CH4(g)+2H2O(g) ΔH7=-202.51kJ/mol (7)
ΔH1~Δ H7Indicate the reaction heat of reaction (1)~(7).
Below by taking 50MW paddy phase Peak Load as an example, according to the conservation of energy and the conservation of mass to material needed for the system with The product of generation is calculated, the method is as follows:
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
Design conditions: by the way of electromagnetic induction heating, electric input power Pa=50MW, electrical efficiency ηe=0.9, thermal effect Rate ηt=0.7, the other heat loss of system are 8%.If coal feeding amount is m, kg/s, gasifying agent CO2。
When using colm, into the heat in furnace are as follows:
Electrical heat input Q1, kJ/s:Q1=Paηeηt=50MW × 0.9 × 0.7=31.5 × 103；
The physical thermal Q that coal dust is brought into2, kJ/s:Q2=CcoalmTcoal=1.21 × 20 × m=24.2m；
Wherein, CcoalFor the specific heat of coal dust, KJ/ (kg DEG C)；TcoalFor coal dust temperature, DEG C；The physical thermal that gasifying agent is brought into Q3, kJ/s:
Q3=CgasmgasTgas=0.996 × 200 × (wC%/12-wS%/16) × 44 × m=387.28m；
Wherein, CgasFor the specific heat of carbon dioxide, KJ/ (kg DEG C)；mgasFor carbon dioxide quality, kg/s；TgasFor dioxy Change carbon temperature, DEG C；wCFor the phosphorus content of coal, %；
The physical thermal Q that lime stone is brought into4, kJ/s:
Q4=CCaCO3mCaCO3TCaCo3=0.84 × 20 × (wS%/32) × 100 × m=0.65625m；
Wherein, CCaCO3For the specific heat of calcium carbonate, KJ/ (kg DEG C)；mCaCO3For calcium carbonate quality, kg/s；TCaCO3For carbonic acid Calcium temperature, DEG C；
The hot Q of the generation of CaS5, kJ/s:Q5=mCaS/MCaS×ΔH2=wS% × m/0.03 × 26.85=10.49m；
Wherein, mCaSFor the quality of CaS, kg/s；MCaSFor the molal weight of CaS, kg/mol；wSFor the sulfur content of coal, %；
The heat consumed in furnace are as follows:
The physical thermal Q that lime-ash is taken out of6, kJ/s:Q6=CashmashTash=0.918 × 1000 × mash=298.425m；
Wherein, CslagFor the specific heat of slag, KJ/ (kg DEG C)；mashFor slag quality, kg/s；TIronFor molten iron temperature, DEG C；
The physical thermal Q that synthesis gas is taken out of7, kJ/s:
Q7=CsmsTs=1.13 × 1000 × (wC%/12-wS%/32) × 56 × m=2820.77m；
Wherein, CsFor the specific heat of synthesis gas, KJ/ (kg DEG C)；msFor synthesis gas quality, kg/s；TsFor synthesis gas temperature, ℃；
The heat Q of coal gasification reaction consumption8, kJ/s:
Q8=mC/MC×ΔH3=(wc%/0.012-ws%/0.032kg/mol) × m × 161.81=7212.40m；
Wherein, mcIndicate the phosphorus content of coal dust, kg/s；McIndicate the molal weight of carbon, kg/mol；
The heat Q of decomposition of limestone consumption9, kJ/s:
Q9=mCaCO3/MCaCo3×ΔH1=wS%/0.032 × m × 110.98=43.12m；
Wherein, mCaCO3Indicate the quality of calcium carbonate, kg/s；MCaCO3Indicate the molal weight of calcium carbonate, kg/mol；
Other radiation loss Q10, kJ/s:Q10=8% × Q1=2.52MW=2.52 × 103；
According to the conservation of energy, Q1+Q2+Q3+Q4+Q5=Q6+Q7+Q8+Q9+Q10Coal feeding amount m=2.91kg/s=can be obtained 10.476t/h。
Calculation method is identical as colm when using fat coal, can obtain using coal feeding amount m=1.86kg/s when fat coal =6.696t/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
MaterialBalance Computation table when gasifying agent proper can be similarly made using vapor, 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: colm uses CO2The synthesis gas generated when as gasifying agent；
The quality of CO is 26.033t/h in synthesis gas, and 5 are mainly reacted in synthesis gas converting means by CO and H2's Molar ratio is adjusted to 1: 3.
CO+H2O=CO2+H2 ΔH5=+39.22kJ/mol (5)
Thus, it is supposed that the amount for being passed through vapor is Xt/h, then according to CO and H2Required molar ratio can obtain:
Wherein, ncoIndicate the amount that the substance of CO is generated in the unit time, mol/s；nH2It indicates to generate H in the unit time2's The amount of substance, mol/s；mCOIndicate the quality that CO is generated in the unit time, kg/s；mH2It indicates to generate H in the unit time2Matter Amount, kg/s, ncoal-H2Indicate pyrolysis of coal in the unit time, mol/s.It can thus be concluded that in synthesis gas converting means vapor need The amount of asking X=11.593t/h, so by m in transformed synthesis gasCO=8.134t/h, mH2=1.746t/h.
It can thus be concluded that the amount for generating methane is 4.648t/h.
The demand of vapor and the final amount for generating methane in synthesis gas converting means can be similarly obtained in the case of remaining, such as Shown in table 4:
The mass balance table that 4 methane of table generates
When by the way of resistance heating, in addition to electrical efficiency and the thermal efficiency and electromagnetic induction heating are different, remaining meter It is all the same to calculate step.
The invention has the benefit that
1. the extra electric energy when present invention can be to low power consumption is effectively utilized, the waste of the energy is reduced, is reached The purpose of peak regulation；
2. electric heater unit heating time of the invention is short, response rapidly, can meet the instant mode of operation stopped；
3. metal thermal carrier of the invention can promote the progress of coal gasification reaction, reaction rate is improved, improves and produces gas group Point；
4. the present invention can carry out high-efficiency cleaning utilization to China's coal resources abundant to the adaptable of coal, produce simultaneously Raw synthesis gas can both be passed through methanation device to produce town gas for resident and use, and carry out chemical industry but also as industrial chemicals The synthesis of product, added value with higher；
5. electric-heating technology and solid thermal carriers Coal Gasification Technology are coupled by the present invention, solves current electrical thermal storage skill The problem of art is limited by season and region factor improves the utilization rate of grid equipment to the full extent, ensure that the height of the energy Effect conversion.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of induction type solid thermal carriers coal gasification electrical thermal storage system of the invention.
Fig. 2 is the structural schematic diagram of resistance-type solid thermal carriers coal gasification electrical thermal storage system of the invention.
In Fig. 1~2,1 it is power supply unit, 2 is coal bunker, 3 is Limestone silo, 4 is batcher, 5 is electromagnetic induction coil, 5- 1 be resistance-type calandria, 6 be metal thermal carrier, 7 be fluid bed powder coal gasification furnace, 8 be cyclone dust collectors, 9 be ash discharge sorting Device, 10 be fine ash collecting chamber, 11 be ash cellar, 12 be flue gas heat-exchange unit, 13 be waste heat boiler, 14 be deduster one, 7-1 is lime Stone entrance, 7-2 are coal powder entrance, 7-3 is gasification agent inlet, 7-4 is return port, 7-5 is gas vent, 9-1 is ash discharge sorting Device feeding inlet, 9-2 are air distribution plate, 9-3 is cinder outlet, 9-4 is fine ash outlet, 15 is gas composition regulating device, 16 is Methanation device.
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 induction type solid thermal carriers coal gasification electrical thermal storage system of the invention, described System includes power supply unit 1, fluid bed powder coal gasification furnace 7, cyclone dust collectors 8, ash discharge sorter 9, fine ash collecting chamber 10, flue gas Heat exchanger 12, waste heat boiler 13 and deduster 1, the power supply unit 1 connect the fluid bed powder coal gasification furnace 7, the stream Changing bed powder coal gasification furnace includes furnace body, and the furnace interior is equipped with metal thermal carrier 6, and outside is equipped with heating element 5；The furnace body Equipped with coal powder entrance 7-2, lime stone entrance 7-1, gasification agent inlet 7-3, return port 7-4 and gas vent 7-5；The gas goes out The mouth 7-5 connection cyclone dust collectors 8, the feed opening of the cyclone dust collectors connect the feeding inlet 9-1 of the ash discharge sorter, The cinder outlet 9-3 of the ash discharge sorter connect with the return port 7-4, the fine ash of the ash discharge sorter export 9-4 and The fine ash collecting chamber 10 connects；The ash discharge sorter is equipped with air distribution plate 9-2, for filtering out fine ash particle；The power supply Device 1 is connect with the heating element 5 and power grid respectively；The flue gas heat-exchange unit 12 is separately connected 8 He of cyclone dust collectors The waste heat boiler 13, the waste heat boiler 13 connect the deduster 1.
Heat exchanger is equipped in the fine ash collecting chamber 10, the outlet of the fine ash collecting chamber connects ash cellar 11.
The heating element is electromagnetic induction coil, and the metal thermal carrier contains alkalinous metal for 0.5~4mm's of diameter The magnetic metal bead of element.
Further, the system can also include town gas processing unit, and the town gas processing unit includes Gas composition regulating device 15 and methanation device 16, the gas composition regulating device connect the deduster one, use The CO and H in through water-gas shift reaction adjusting synthesis gas2Molar ratio be 1: 3, the methanation device is for will be from described The gaseous mixture that gas composition regulating device comes out is completely converted into town gas by methanation reaction.
Fig. 2 provides the structural schematic diagram of resistance-type solid thermal carriers coal gasification electrical thermal storage system of the invention, with Fig. 1 The distinctive points of system be: heating element is resistance-type calandria, and metal thermal carrier is 0.5~4mm of diameter containing alkalinity The prill of metallic element.
Embodiment 1
A kind of solid thermal carriers coal gasification electrical thermal storage method is using electrical thermal storage system as shown in Figure 1, the system The fluid bed powder coal gasification furnace main body used unite as cylinder, sectional area 4m2, a height of 9m；Heating element is electromagnetic induction line Circle；Metal thermal carrier is the small ball that diameter is 1.2mm, is filled in fluid bed powder coal gasification furnace, packed height 6m, described Energy-storage 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 energy introducing fluid bed powder coal gasification furnace internal heating metal heat carrier to temperature is reached 1000 DEG C and keeps permanent It is fixed；
(3) coal dust and lime stone are passed through into coal powder entrance respectively and lime stone entrance is added to fluid bed powder coal gasification furnace It is interior, 200 DEG C of gasifying agent CO will be preheated to2It is passed through by gasification agent inlet anti-to progress coal gasification in fluid bed powder coal gasification furnace It answers, wherein CO2Fluidising air velocity in fluid bed powder coal gasification furnace is 2.5m/s, CO2, lime stone and C and gasifying agent in coal dust In O molar ratio be 1: 1, CaCO3Molar ratio with the S in coal dust is 1: 1；In reaction process, entrained solids reaction mass Gaseous mixture constantly isolate cinder and fine ash under the action of cyclone dust collectors and ash discharge sorter after obtain coal gas of high temperature, Middle cinder, which is back in fluid bed powder coal gasification furnace, continues coal gasification reaction, and fine ash of the diameter less than 1mm is collected in fine ash Indoor carry out waste heat recycling enters ash cellar after being cooled to 150 DEG C or less；CO and H in coal gas of high temperature2Yield be 20826.4m3/ h, 509.2m3/h。
(4) coal gas of high temperature is subjected to waste heat recycling by flue gas heat-exchange unit, in heat exchanger, coal gas of high temperature is changed with water Heat, gas temperature can be down to 250 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 6507.2m3/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 solid thermal carriers coal gasification electrical thermal storage method is using electrical thermal storage system as shown in Figure 2, the system The fluid bed powder coal gasification furnace main body used unite as cylinder, sectional area 4m2, a height of 9m；Heating element is resistance-type heating Body；Metal thermal carrier is the small ball that diameter is 1.2mm, is filled in fluid bed powder coal gasification furnace, packed height 6m, described Energy-storage 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 energy introducing fluid bed powder coal gasification furnace internal heating metal heat carrier to temperature is reached 1000 DEG C and keeps permanent It is fixed；
(3) coal dust and lime stone are passed through into coal powder entrance respectively and lime stone entrance is added to fluid bed powder coal gasification furnace It is interior, 200 DEG C of gasifying agent vapor will be preheated to and be passed through by gasification agent inlet to carrying out coal gasification in fluid bed powder coal gasification furnace Reaction, wherein fluidising air velocity of the vapor in fluid bed powder coal gasification furnace is 2.5m/s, in vapor, lime stone and coal dust The molar ratio of C and the O in gasifying agent are 1: 1, CaCO3Molar ratio with the S in coal dust is 1: 1；In reaction process, entrained solids The gaseous mixture of reaction mass obtains height after constantly isolating cinder and fine ash under the action of cyclone dust collectors and ash discharge sorter Warm coal gas, wherein cinder, which is back in fluid bed powder coal gasification furnace, continues coal gasification reaction, and fine ash of the diameter less than 1mm exists It carries out entering ash cellar after waste heat recycling is cooled to 150 DEG C or less in fine ash collecting chamber；CO and H in coal gas of high temperature2Yield be 12230.4m3/ h and 12790.4m3/h；
(4) coal gas of high temperature is subjected to waste heat recycling by flue gas heat-exchange unit, in heat exchanger, coal gas of high temperature is changed with water Heat, gas temperature can be down to 250 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 6255.2m3/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 solid thermal carriers coal gasification electrical thermal storage method is using more set electrical thermal storage systems as shown in Figure 1, institute The fluid bed powder coal gasification furnace main body that more set systems use is stated as cylinder, sectional area 4m2, a height of 9m；Heating element is electricity Magnetic induction coil；Metal thermal carrier is the small ball that diameter is 1.2mm, is filled in fluid bed powder coal gasification furnace, packed height For 6m, the energy-storage 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 energy introducing fluid bed powder coal gasification furnace internal heating metal heat carrier to temperature is reached 1000 DEG C and keeps permanent It is fixed；
(3) coal dust and lime stone are passed through into coal powder entrance respectively and lime stone entrance is added to fluid bed powder coal gasification furnace It is interior, 200 DEG C of gasifying agent CO will be preheated to2It is passed through by gasification agent inlet anti-to progress coal gasification in fluid bed powder coal gasification furnace It answers, wherein CO2Fluidising air velocity in fluid bed powder coal gasification furnace is 2.5m/s, CO2, lime stone and C and gasifying agent in coal dust In O molar ratio be 1: 1, CaCO3Molar ratio with the S in coal dust is 1: 1；In reaction process, entrained solids reaction mass Gaseous mixture constantly isolate cinder and fine ash under the action of cyclone dust collectors and ash discharge sorter after obtain coal gas of high temperature, Middle cinder, which is back in fluid bed powder coal gasification furnace, continues coal gasification reaction, and fine ash of the diameter less than 1mm is collected in fine ash Indoor carry out waste heat recycling enters ash cellar after being cooled to 150 DEG C or less；CO and H in coal gas of high temperature2Yield be 20826.4m3/ h, 509.2m3/h；
(4) coal gas of high temperature is subjected to waste heat recycling by flue gas heat-exchange unit, in heat exchanger, coal gas of high temperature is changed with water Heat, gas temperature can be down to 250 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 6507.2m3/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 (4)

1. a kind of solid thermal carriers coal gasification electrical thermal storage method, using a kind of solid thermal carriers coal gasification electrical thermal storage system, It is characterized in that, the solid thermal carriers coal gasification electrical thermal storage system includes power supply unit, fluid bed powder coal gasification furnace, rotation Wind deduster, ash discharge sorter and fine ash collecting chamber, the power supply unit connect the fluid bed powder coal gasification furnace, the fluidisation Bed powder coal gasification furnace includes furnace body, and the furnace interior is equipped with metal thermal carrier, and outside is equipped with heating element；The furnace body is equipped with Coal powder entrance, lime stone entrance, gasification agent inlet, return port and gas vent；The gas vent connects the cyclone dust removal Device, the feed opening of the cyclone dust collectors connect the feeding inlet of the ash discharge sorter, the cinder outlet of the ash discharge sorter It is connect with the return port, the fine ash outlet of the ash discharge sorter is connect with the fine ash collecting chamber；The ash discharge sorter Equipped with air distribution plate, for filtering out fine ash particle；The power supply unit is connect with the heating element and power grid respectively；
The system also includes flue gas heat-exchange unit, waste heat boiler and deduster, the flue gas heat-exchange unit is separately connected the whirlwind Deduster and the waste heat boiler, the waste heat boiler connect the deduster；
Heat exchanger is equipped in the fine ash collecting chamber, the outlet of the fine ash collecting chamber connects ash cellar；
The heating element is induction coil or resistance-type calandria, in which:
When heating element is induction coil, the metal thermal carrier is the magnetic containing alkaline element of 0.5~4mm of diameter Property prill；
When heating element is resistance-type calandria, the metal thermal carrier contains alkaline element for 0.5~4mm's of diameter Prill；
The system also includes town gas processing unit, the town gas processing unit includes gas composition regulating device And methanation device, the gas composition regulating device connect the deduster, it is high for being adjusted by water-gas shift reaction CO and H in warm coal gas2Molar ratio be 1:3, the methanation device from the gas composition regulating device for will come out Gaseous mixture town gas is completely converted by methanation reaction；
The method specifically includes the following steps:
(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) electric energy introducing fluid bed powder coal gasification furnace internal heating metal heat carrier to temperature is reached 800 ~ 1300 DEG C and keeps permanent It is fixed；
(3) coal dust and lime stone are passed through into coal powder entrance respectively and lime stone entrance is added to fluid bed powder coal gasification furnace, it will 200 ~ 400 DEG C of gasifying agent is preheated to be passed through to coal gasification reaction is carried out in fluid bed powder coal gasification furnace, instead by gasification agent inlet During answering, the gaseous mixture of entrained solids reaction mass is constantly isolated slightly under the action of cyclone dust collectors and ash discharge sorter Coal gas of high temperature is obtained after ash and fine ash, wherein cinder, which is back in fluid bed powder coal gasification furnace, continues coal gasification reaction, carefully Ash is by entering ash cellar after fine ash collecting chamber；
(4) coal gas of high temperature is used to prepare town gas or chemical products.
2. a kind of solid thermal carriers coal gasification electrical thermal storage method according to claim 1, it is characterised in that the gasification Agent is CO2, vapor, richness CO2One of flue gas or a variety of mixing, stream of the gasifying agent in fluid bed powder coal gasification furnace Change wind speed is 0.5~8m/s.
3. a kind of solid thermal carriers coal gasification electrical thermal storage method according to claim 1, it is characterised in that the gasification The molar ratio of the O in C and gasifying agent in agent, lime stone and coal dust is 1:0.9 ~ 1:1.5, CaCO3With mole of the S in coal dust Than for 1:1 ~ 2.5:1.
4. a kind of solid thermal carriers coal gasification electrical thermal storage method according to claim 1, it is characterised in that it is described will be high Warm coal gas is used to prepare town gas, detailed process are as follows: successively enters coal gas of high temperature after heat exchanger heat exchange, deduster dedusting Gas composition regulating device is that 250 ~ 300 DEG C of vapor react generation H with temperature2, and control CO in coal gas of high temperature and give birth to At H2Molar ratio be 1:3；Gaseous mixture is sent into methanation device and obtains city in 250 ~ 300 DEG C of generation methanation reactions Coal gas.
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