CN103062787A - Method and device for burning pulverized coal with self-heating oxygen generation function - Google Patents
Method and device for burning pulverized coal with self-heating oxygen generation function Download PDFInfo
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- CN103062787A CN103062787A CN2012105462370A CN201210546237A CN103062787A CN 103062787 A CN103062787 A CN 103062787A CN 2012105462370 A CN2012105462370 A CN 2012105462370A CN 201210546237 A CN201210546237 A CN 201210546237A CN 103062787 A CN103062787 A CN 103062787A
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Abstract
The invention provides a method for burning pulverized coal with a self-heating oxygen generation function. A tungsten-based oxide is used as a composite oxygen carrier to perform reduction reaction with fuel containing carbon to generate Cu, W, CO2 and non-condensing gas; oxidation reaction is performed on W and Cu generated through reduction reaction in air atmosphere to regenerate CuWO4; the CuWO4 generated through oxidation reaction is decomposed to generate O2, Cu2O and WO2 with the help of heat generated through the oxidation reaction, and O2 and generated non-condensing gas are reacted to generate CO2 and steam; oxidation reaction is performed on Cu2O and WO2 generated through decomposition in air atmosphere to form CuWO4 again, and next circular reaction is returned continuously. A device for achieving the method is further provided. The method and device for burning the pulverized coal with the self-heating oxygen generation function utilizes heat released through oxidation and regeneration of a tungsten-based reduction product to meet heat required by O2 release through decomposition of renewable product, can obtain pure O2, achieves heat balance, and simultaneously eliminates non-condensing gas in tail gas caused by coal combustion.
Description
Technical field
The present invention relates to the coal combustion technology field, be specifically related to a kind of method and apparatus of being convenient to the burning of coal-based chemical chain, realize the efficient utilization of the carbonic solid fuels such as coal and fully conversion.
Background technology
Direct chemical chain burning technology take coal as fuel, as a kind of novel oxygen combustion system, directly replace air with the carrier of oxygen, realize the non-mixing flameless combustion of coal, have significant advantage, can not only be in the situation that lose CO in less energy, the realization coal combustion process
2Effective separation; And avoided coal directly and the irreversible loss in the air burning process, and realized the cascade utilization of internal system heat, have a higher efficiency of combustion; Simultaneously, can also effectively suppress NO in the coal combustion process
xGeneration.
But, directly in the burning chemistry chains process take coal as fuel, there are following two great limiting elements, specific as follows:
At first, in the combustion process, main what occur still is gas-solid oxidation reaction between coal gasification product and the carrier of oxygen, rather than pulverized coal particle directly and the solid-solid reaction between the carrier of oxygen; Simultaneously, because gasification rate of coal is far below the reaction rate between coal gasification product and the carrier of oxygen, it is the limiting element of direct burning chemistry chains take coal as fuel, cause in the burning chemistry chains process, coal dust is difficult to be gasified totally, take full advantage of, comprise certain flammable incondensable gas in the coal combustion tail gas, be mainly CO, H
2, CH
4
Secondly, directly in the burning chemistry chains process take coal as fuel, the reaction of coal and the carrier of oxygen is mainly carried out in fuel reactor, and the version of fuel reactor is take bubbling bed reactor as main.In the binary bed material in view of coal and the carrier of oxygen, the density of the density ratio carrier of oxygen of coal is much smaller, has larger density contrast between the two, is easy to occur the segregation of bed material, causes that coal and the carrier of oxygen are difficult to effectively contact, abundant fluidization.And when pulverized coal particle moved to the upper end pyrolysis of carrier of oxygen particle, gasification, the noncondensing fuel gas that produces (mainly comprised CO, H
2, CH
4), because contacting with the carrier of oxygen, also be difficult to oxidized.
Just for these reasons, caused the directly burning chemistry chains process take coal as fuel, coal dust is difficult to effective gasification, takes full advantage of, and the on-condensible gas that mixes in the coal combustion tail gas mainly comprises CO, H
2, CH
4, not only can cause CO
2Separation difficulty, power consumption increases; And cause coal dust to be difficult to abundant burning, very uneconomical.
Therefore, adopt an effective measure, promote the burning conversion of incondensable gas in the tail gas, for the Efficient Conversion of coal and applying of coal chemistry chain burning, all have great importance.
Summary of the invention
The object of the present invention is to provide a kind of coal dust combustion method with self-heating oxygen separating function, Pure Oxygen Combustion Technology and chemical chain burning technology combination with coal had both overcome pure O in the pure oxygen burning
2The restriction of expensive, the highly energy-consuming of preparation promotes again effective conversion of coal, the efficient utilization, eliminates incondensable gas in the coal combustion tail gas, obtains the CO of high concentration
2, be convenient to follow-up storage and process.
The present invention also aims to provide the device of realizing said method, Pure Oxygen Combustion Technology and chemical chain burning technology combination with coal had both overcome pure O in the pure oxygen burning
2The restriction of expensive, the highly energy-consuming of preparation promotes again effective conversion of coal, the efficient utilization, eliminates incondensable gas in the coal combustion tail gas, obtains the CO of high concentration
2, be convenient to follow-up storage and process.
A kind of coal dust combustion method with self-heating oxygen separating function is specially:
(1) utilizes the tungsten base oxide as composite oxygen carrier, with carbon-containing fuel generation reduction reaction, generate Cu, W, CO
2And incondensable gas;
(2) oxidation reaction occurs in W and the Cu of the generation of step (1) reduction reaction under air atmosphere, regenerates CuWO
4
(3) CuWO of step (2) oxidation reaction generation
4, the heat by oxidation reaction produces decomposes under steam atmosphere, produces O
2, Cu
2O and WO
2, the O of generation
2The incondensable gas reaction that generates with step (1) generates CO
2And steam;
(4) step (3) is decomposed the Cu that produces
2O and WO
2, under air atmosphere oxidation reaction occurs again, again form CuWO
4, returning step (1) and continue next time circular response, the heat that this step reaction discharges is as the thermal source of step (1) reduction reaction.
A kind of coal powder burner with self-heating oxygen separating function comprises that pipeline successively is connected to form the first output of the reduction reactor in loop, the input of the first oxidation reactor, the output of the first oxidation reactor, the input of the first separator, the output of the first separator, the input of decomposition reactor, the output of decomposition reactor, the input of the second separator, the first output of the second separator, the input of the second oxidation reactor, the output of the second oxidation reactor, the input of the 3rd separator, the output of the 3rd separator and the first input end of reduction reactor; The second output of the second separator connects the second input of reduction reactor 1 by condenser 7 pipelines.
Technique effect of the present invention is embodied in:
(1) the present invention adopts the tungsten base oxide as composite oxygen carrier, has higher reaction concertedness and oxygen release capacity, therefore has larger practical potentiality.
(2) the tungsten base oxide decomposes release O
2Be the endothermic reaction, and the reduzate of tungsten base oxide and coal reaction is exothermic reaction with air oxidation regeneration again, the heat that discharges satisfies the tungsten base oxide fully and decomposes release O
2The time needed heat, thereby not only realized O by the oxidation regeneration of tungsten base oxide reduzate and the decomposition of tungsten base oxide
2Preparation, in the situation that need not external heat source, realized the balance of heat.
(3) CuWO
4Decompose the Cu that produces
2O and WO
2Under air atmosphere oxidation reaction occuring, again forms CuWO
4, and release heat, this heat can offer the reduction reaction of tungsten base oxide and coal, promotes effective conversion of coal, the efficient utilization, and energy need not additionally be provided, and reduces power consumption.
(4) O for preparing
2Incondensable gas reaction with tungsten base oxide and coal reduction reaction produce generates CO
2And steam, effectively eliminated incondensable gas in the coal combustion tail gas.
(5) fuel tolerance is wide, except the coal of differential responses, and other solid carbon fuel, such as mud, petroleum coke, living beings etc., also applicable.
(6) in the oxygen generation system, the first air reactor and decomposition reactor adopt nesting type structure, can effectively finish the oxidation regeneration of tungsten base oxide and the reacted reduzate of coal (Cu, W), and the decomposition oxygen processed of regenerable oxide, system flow simplified.
(7) whole system can be moved continuously, and by optimum of operation, realizes the self-balancing of system capacity, energy saving economy.
Description of drawings
Fig. 1 is the inventive method flow chart;
Fig. 2 is apparatus of the present invention structure chart;
Fig. 3 is pure O
2The first layout drawing of jet pipe (diagonal angle layout);
Fig. 4 is pure O
2The second layout drawing of jet pipe (layout liquidates);
Fig. 5 is CuWO
4Divide and explain O
2Figure.
The specific embodiment
The present invention will be further described in detail below in conjunction with accompanying drawing.
Fig. 1 provides the inventive method flow chart, and a kind of coal dust combustion method with self-heating oxygen separating function is specially:
(1) utilizes the tungsten base oxide as composite oxygen carrier, with carbon-containing fuel generation reduction reaction, generate Cu, W, CO
2And incondensable gas;
(2) oxidation reaction occurs in W and the Cu of the generation of step (1) reduction reaction under air atmosphere, regenerates CuWO
4, and release heat;
(3) CuWO that regenerates of step (2)
4, the heat that produces by oxidation reaction decomposes generation O
2, Cu
2O and WO
2, the O of generation
2The incondensable gas reaction that generates with step (1) generates CO
2And steam;
(4) step (3) is decomposed the Cu that produces
2O and WO
2, oxidation reaction occurs under air atmosphere, again form CuWO
4, and release heat, returning step (1) and continue next time circular response, the heat that this step discharges is as the thermal source of step (1) reduction reaction.
Realization proposed by the invention has a kind of better implementation of the coal powder burner of self-heating oxygen separating function, as shown in Figure 2, comprises fuel reactor system, pure O
2Preparation system and air reactor system three parts.Concrete, connect to form the fuel reactor system by reduction reactor 1, separator 10 and flying dust trap 11; Connect to form successively pure O by seal valve 2, oxidation reactor 3, decomposition reactor 4, separator 5,6 and condenser 7
2Preparation system; Form the air reactor system by oxidation reactor 8 and separator 9.
Bubbling fluidized bed is designed to cuboid (also can be cylinder), prepared pure O
2Introduce in the fuel reactor 1 by jet pipe, the arrangement of jet pipe or be four jiaos of layouts (referring to Fig. 3), the angle of jet pipe axle center and the adjacent two side of bubbling fluidized bed is 45 °, the O that sprays
2Burn in circle of contact mode with incondensable gas; Perhaps jet pipe is placed in the middle of the sidewall of bubbling fluidized bed, is the arrangement that liquidates (referring to Fig. 4).Strengthened so pure O
2Mix with the turbulent flow of incondensable gas, be conducive to the abundant burning of incondensable gas.
Reduction reactor 1 can adopt bubbling fluidized bed, spouted bed and two-period form reactor etc., and oxidation reactor 3 and 8 can adopt fast fluidized bed reactor, moving bed etc., and decomposition reactor 4 can adopt fast fluidized bed reactor, moving bed etc.
In the example of the present invention, reduction reactor 1 adopts bubbling fluidized bed, and oxidation reactor 3 and 8 adopts fast fluidized bed reactor, and decomposition reactor 4 adopts fast fluidized bed reactor.The below is take carbonaceous solids such as coals as fuel, with CuWO
4Be example as composite oxygen carrier, carry out a series of course of reaction, be convenient to the abundant conversion of coal, and high-purity CO that generates
2, then to be convenient to follow-up storage and to process, the implementation flow process is as follows:
(1) at first, in bubbling fluidized bed 1, at CO
2Under the fluidization medium effect, introduce quantitative coal and CuWO
4Reaction generates CO
2, steam, a small amount of incondensable gas CO, CH
4And H
2And tungsten base reduction solid product Cu, W;
(2) gas-phase product that obtains of step (1) (comprises CO
2With steam and the flying dust that carries) by separator 10, isolated flying dust enters trap 11 and catches, and gas phase CO
2Discharge by separator 10 with water vapour, just can obtain the CO of high concentration after the condensation separation
2, be convenient to subsequent treatment;
(3) the solid product W and the Cu that obtain of step (1) enters in the fast fluidized bed reactor 3 by seal valve 2, under 600-900 ℃ and air atmosphere, carries out oxidation regeneration, regenerates CuWO
4, and reacted residual air is discharged by the exhaust outlet of separator 5;
(4) step (3) CuWO that regenerates and form
4, separating with residual air by separator 5, and introduce fast fluidized bed reactor 4 by the dipleg of separator 5, the heat by step (3) oxidation reaction produces under steam atmosphere, decomposes generation O
2And solid product Cu
2O, WO
2, and in separator 6, separated O
2Reach residual water vapor and carry out condensation separation by condenser 7, make pure O
2(referring to Fig. 5); Step (1) the incondensable gas that produces in reactor 1, upwards flow incondensable gas and pure O
2Haptoreaction fully transforms, and forms CO
2And steam;
(5) and the Cu that step (4) is decomposed to form
2O and WO
2Solid product is then introduced in the fast fluidized bed reactor 8, and under 600-900 ℃ and air atmosphere, oxidation regeneration forms CuWO again
4, and in separator 9, separate with residual air; The heat that this step reaction discharges is as the thermal source of step (1) reduction reaction.
(6) step (5) CuWO that regenerates and be prepared into
4Introduce in the fuel reactor 1 by separator 9, carry out reduction reaction with coal in reactor 1 bottom, produce the solid phase reduction products such as Cu, W, and again introduce reactor 3 by seal valve 2, carry out next time circular response.
Except the CuWO in the described example
4In addition, also can adopt MnWO
4, NiWO
4And CoWO
4Deng the tungsten base oxide as composite oxygen carrier.
Those skilled in the art will readily understand; the above only is preferred embodiment of the present invention; not in order to limiting the present invention, all any modifications of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. coal dust combustion method with self-heating oxygen separating function is specially:
(1) utilizes the tungsten base oxide as composite oxygen carrier, with carbon-containing fuel generation reduction reaction, generate Cu, W, CO
2And incondensable gas;
(2) oxidation reaction occurs in W and the Cu of the generation of step (1) reduction reaction under air atmosphere, regenerates CuWO
4
(3) CuWO of step (2) oxidation reaction generation
4, under steam atmosphere, decompose, produce O
2, Cu
2O and WO
2, the O of generation
2The incondensable gas reaction that generates with step (1) generates CO
2And steam;
(4) step (3) is decomposed the Cu that produces
2O and WO
2, under air atmosphere oxidation reaction occurs again, again form CuWO
4, return step (1) and continue next time circular response.
2. powder combustion method according to claim 1 is characterized in that, described tungsten base oxide is CuWO
4, MnWO
4, NiWO
4And CoWO
4In any one.
3. coal powder burner with self-heating oxygen separating function comprises that pipeline successively is connected to form the first output of the reduction reactor in loop, the input of the first oxidation reactor, the output of the first oxidation reactor, the input of the first separator, the output of the first separator, the input of decomposition reactor, the output of decomposition reactor, the input of the second separator, the first output of the second separator, the input of the second oxidation reactor, the output of the second oxidation reactor, the input of the 3rd separator, the output of the 3rd separator and the first input end of reduction reactor; The second pipeline at output of the second separator connects the input of condenser, and the pipeline at output of condenser connects the second input of reduction reactor.
4. coal powder burner according to claim 3, it is characterized in that, the output of described condenser connects reduction reactors by four jet pipes, and four jet pipes connect respectively four jiaos of reduction reactor one by one, and the two side shape that each jet pipe is adjacent respectively in angle of 45 degrees; Or four jet pipes are uniformly distributed in the sidewall center of reduction reactor, and jet pipe is perpendicular to the sidewall of reduction reactor.
5. according to claim 3 or 4 described coal powder burners, it is characterized in that, described reduction reactor adopts bubbling fluidized bed, spouted bed or two-period form reactor, first and second oxidation reactor adopts fast fluidized bed reactor or moving bed, and decomposition reactor adopts fast fluidized bed reactor or moving bed.
6. according to claim 3 or 4 described coal powder burners, it is characterized in that, also comprise the 4th separator and flying dust trap, the input of the 4th separator connects the first output of the first oxidation reactor, and the input of the 4th separator connects the input of flying dust trap.
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Cited By (8)
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| CN103387209A (en) * | 2013-08-01 | 2013-11-13 | 北京科技大学 | Continuously-running moving bed chemical-looping reaction system |
| CN105299685A (en) * | 2015-11-09 | 2016-02-03 | 广西桂晟新能源科技有限公司 | Method of applying water vapor to coal combustion boiler |
| CN105299684A (en) * | 2015-11-09 | 2016-02-03 | 广西桂晟新能源科技有限公司 | Process of applying water vapor to coal combustion boiler |
| CN105351918A (en) * | 2015-11-09 | 2016-02-24 | 广西桂晟新能源科技有限公司 | Lean oxygen combustion process for improving capture efficiency of carbon dioxide |
| CN106902837A (en) * | 2017-03-31 | 2017-06-30 | 天津大学 | A kind of load-type nickel tungsten bimetal composite oxide and its preparation method and application |
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| CN109439369A (en) * | 2018-12-29 | 2019-03-08 | 新奥科技发展有限公司 | A kind of coal-based chemical chain gasification method |
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| CN108083236A (en) * | 2018-01-25 | 2018-05-29 | 华中科技大学 | A kind of recycle chemistry chain oxygen generation system based on perofskite type oxide |
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