CN103062787B - 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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- CN103062787B CN103062787B CN201210546237.0A CN201210546237A CN103062787B CN 103062787 B CN103062787 B CN 103062787B CN 201210546237 A CN201210546237 A CN 201210546237A CN 103062787 B CN103062787 B CN 103062787B
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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 coal combustion technology field, be specifically related to a kind of method and apparatus being convenient to the burning of coal-based chemical chain, realize the efficiency utilization of the carbonic solid fuels such as coal and fully transform.
Background technology
It is directly the chemical chain burning technology of fuel with coal, as a kind of novel oxygen combustion system, directly replace air with the carrier of oxygen, realize the non-mixed flameless combustion of coal, there is significant advantage, can not only when lose less energy, realize CO in coal combustion process
2effective separation; And avoid the irreversible loss of coal directly and in air burning process, achieve the cascade utilization of internal system heat, there is higher efficiency of combustion; Meanwhile, NO in coal combustion process can also effectively be suppressed
xgeneration.
But, be directly in the burning chemistry chains process of fuel with coal, there are following two great limiting elements, specific as follows:
First, in combustion process, main what occur is still gas-solid oxidation reaction between coal gasification product and the carrier of oxygen, instead of the solid-solid reaction of pulverized coal particle directly and 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 the burning chemistry chains being directly fuel with coal, cause in burning chemistry chains process, coal dust is difficult to be gasified totally, make full use of, comprise certain flammable incondensable gas in coal combustion tail gas, be mainly CO, H
2, CH
4.
Secondly, be directly that in the burning chemistry chains process of fuel, the reaction of coal and the carrier of oxygen is mainly carried out in fuel reactor, and the version of fuel reactor is based on bubbling bed reactor with coal.In view of in the binary bed material of coal and the carrier of oxygen, the density of the density ratio carrier of oxygen of coal is much smaller, there is larger density contrast therebetween, is easy to the segregation of bed material occurs, and causes coal and the carrier of oxygen to be difficult to effectively to contact, abundant fluidization.And when pulverized coal particle moves to the upper end pyrolysis of carrier of oxygen particle, gasification, the noncondensing fuel gas produced (mainly comprises CO, H
2, CH
4), because contacting with the carrier of oxygen, be also difficult to oxidized.
Just for these reasons, result in is directly the burning chemistry chains process of fuel with coal, and coal dust is difficult to effective gasification, makes full use of, and the on-condensible gas adulterated in 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 Thorough combustion, very uneconomical.
Therefore, adopt an effective measure, promote the burning conversion of incondensable gas in 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, the Pure Oxygen Combustion Technology of coal and chemical chain burning technology are organically combined, both overcome pure O in pure oxygen burning
2the high cost of preparation, the restriction of highly energy-consuming, promote again effective conversion of coal, efficiency utilization, eliminates incondensable gas in coal combustion tail gas, obtains the CO of high concentration
2, be convenient to follow-up storage process.
The present invention also aims to provide the device realizing said method, the Pure Oxygen Combustion Technology of coal and chemical chain burning technology are organically combined, both overcome pure O in pure oxygen burning
2the high cost of preparation, the restriction of highly energy-consuming, promote again effective conversion of coal, efficiency utilization, eliminates incondensable gas in coal combustion tail gas, obtains the CO of high concentration
2, be convenient to follow-up storage process.
There is a coal dust combustion method for self-heating oxygen separating function, be specially:
(1) utilize tungsten base oxide as composite oxygen carrier, with carbon-containing fuel generation reduction reaction, generate Cu, W, CO
2and incondensable gas;
(2), there is oxidation reaction in air atmosphere, regenerate CuWO in W and Cu of step (1) reduction reaction generation
4;
(3) CuWO of step (2) oxidation reaction generation
4, by the heat that oxidation reaction produces, decompose under steam atmosphere, produce O
2, Cu
2o and WO
2, the O of generation
2the incondensable gas generated with step (1) reacts and generates CO
2and steam;
(4) step (3) decomposes the Cu produced
2o and WO
2, then there is oxidation reaction in air atmosphere, again form CuWO
4, return step (1) and continue circular response next time, 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, comprise the first output that pipeline is successively connected to form 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, 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, second output of the second separator connects the second input of reduction reactor 1 by condenser 7 pipeline.
Technique effect of the present invention is embodied in:
(1) the present invention adopts tungsten base oxide as composite oxygen carrier, has higher reaction concertedness and oxygen release capacity, therefore has larger practical potentiality.
(2) tungsten base oxide decomposes release O
2for the endothermic reaction, and the reduzate that tungsten base oxide and coal react to regenerate with air oxidation be exothermic reaction again, the heat discharged meets tungsten base oxide completely and decomposes release O
2time required heat, thus not only achieve O by the oxidation regeneration of tungsten base oxide reduzate and the decomposition of tungsten base oxide
2preparation, when without the need to external heat source, achieve the balance of heat.
(3) CuWO
4decompose the Cu produced
2o and WO
2there is oxidation reaction in air atmosphere, again form CuWO
4, and release heat, this heat can be supplied to the reduction reaction of tungsten base oxide and coal, promotes effective conversion of coal, efficiency utilization, additionally need not provide energy, reduces power consumption.
(4) O prepared
2the incondensable gas produced with tungsten base oxide and coal reduction reaction reacts, and generates CO
2and steam, effectively eliminate incondensable gas in coal combustion tail gas.
(5) fuel tolerance is wide, and except the coal of differential responses, other solid carbonaceous fuels, such as mud, petroleum coke, living beings etc., be also suitable for.
(6) in oxygen generation system, first air reactor and decomposition reactor adopt nesting type structure, effectively can complete the oxidation regeneration of tungsten base oxide and the reacted reduzate of coal (Cu, W), and the decomposition oxygen of regenerable oxide, simplify system flow.
(7) whole system can be run continuously, and by optimum of operation, realizes the self-balancing of system capacity, energy saving economy.
Accompanying drawing explanation
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 (diagonal angle layout) of jet pipe;
Fig. 4 is pure O
2the second layout drawing (liquidate layout) of jet pipe;
Fig. 5 is CuWO
4divide and explain O
2figure.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention will be further described in detail.
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) utilize tungsten base oxide as composite oxygen carrier, with carbon-containing fuel generation reduction reaction, generate Cu, W, CO
2and incondensable gas;
(2), there is oxidation reaction in air atmosphere, regenerate CuWO in W and Cu of step (1) reduction reaction generation
4, and release heat;
(3) CuWO that regenerates of step (2)
4, the heat produced by oxidation reaction decomposes generation O
2, Cu
2o and WO
2, the O of generation
2the incondensable gas generated with step (1) reacts and generates CO
2and steam;
(4) step (3) decomposes the Cu produced
2o and WO
2, there is oxidation reaction in air atmosphere, again form CuWO
4, and release heat, return step (1) and continue circular response next time, the heat that this step discharges is as the thermal source of step (1) reduction reaction.
Realization proposed by the invention has the better implementation of one 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 part.Concrete, connect to form fuel reactor system by reduction reactor 1, separator 10 and flying dust trap 11; Pure O is connected to form successively by seal valve 2, oxidation reactor 3, decomposition reactor 4, separator 5,6 and condenser 7
2preparation system; Air reactor system is formed by oxidation reactor 8 and separator 9.
Bubbling fluidized bed is designed to cuboid (also can be cylinder), prepared pure O
2introduced in fuel reactor 1 by jet pipe, the arrangement of jet pipe or be corner layout (see Fig. 3), the angle of two side adjacent with bubbling fluidized bed, jet pipe axle center is 45 °, the O sprayed
2burn in circle of contact mode with incondensable gas; Or jet pipe is placed in the middle of the sidewall of bubbling fluidized bed, be the arrangement that liquidates (see Fig. 4).Strengthen pure O like this
2with the turbulent closure scheme of incondensable gas, be conducive to the Thorough combustion 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 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.Below with carbonaceous solids such as coals for 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 generate high-purity CO
2, be then convenient to follow-up storage process, concrete implementing procedure is as follows:
(1) first, in bubbling fluidized bed 1, at CO
2under 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 step (1) obtains (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
2discharged by separator 10 with water vapour, after condensation separation, just can obtain the CO of high concentration
2, be convenient to subsequent treatment;
(3) solid product W and Cu that obtain of step (1), enters in fast fluidized bed reactor 3 by seal valve 2, under 600-900 DEG C 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) regenerate formed CuWO
4, be separated with residual air by separator 5, and introduce fast fluidized bed reactor 4 by the dipleg of separator 5, by the heat that step (3) oxidation reaction produces, under steam atmosphere, decompose and produce O
2and solid product Cu
2o, WO
2, and be separated in separator 6, O
2and residual water vapor carries out condensation separation by condenser 7, obtained pure O
2(see Fig. 5); Step (1) produce incondensable gas and upwards flow in reactor 1, incondensable gas and pure O
2haptoreaction, fully transforms, and forms CO
2and steam;
(5) Cu that step (4) is decomposed to form
2o and WO
2solid product is then introduced in fast fluidized bed reactor 8, and under 600-900 DEG C and air atmosphere, oxidation regeneration, forms CuWO again
4, and be separated with residual air in separator 9; The heat that this step reaction discharges is as the thermal source of step (1) reduction reaction.
(6) step (5) regenerate the CuWO be prepared into
4introduce in 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 circular response next time.
Except the CuWO in described example
4in addition, also MnWO can be adopted
4, NiWO
4and CoWO
4deng tungsten base oxide as composite oxygen carrier.
Those skilled in the art will readily understand; the foregoing is only preferred embodiment of the present invention; not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (5)
1. there is a coal dust combustion method for self-heating oxygen separating function, be specially:
(1) utilize tungsten base oxide as composite oxygen carrier, with carbon-containing fuel generation reduction reaction, generate Cu, W, CO
2and incondensable gas;
(2), there is oxidation reaction in air atmosphere, regenerate CuWO in W and Cu of step (1) reduction reaction generation
4;
(3) CuWO of step (2) oxidation reaction generation
4, decompose under steam atmosphere, produce O
2, Cu
2o and WO
2, the O of generation
2the incondensable gas generated with step (1) reacts and generates CO
2and steam;
(4) step (3) decomposes the Cu produced
2o and WO
2, then there is oxidation reaction in air atmosphere, again form CuWO
4, return step (1) and continue circular response next time.
2. one kind has the coal powder burner of self-heating oxygen separating function, comprise the first output that pipeline is successively connected to form the reduction reactor (1) in loop, the input of the first oxidation reactor (3), the output of the first oxidation reactor (3), the input of the first separator (5), the output of the first separator (5), the input of decomposition reactor (4), the output of decomposition reactor (4), the input of the second separator (6), first output of the second separator (6), the input of the second oxidation reactor (8), the output of the second oxidation reactor (8), the input of the 3rd separator (10), the output of the 3rd separator (10) and the first input end of reduction reactor (1), second pipeline at output of the second separator (6) connects the input of condenser (7), and the pipeline at output of condenser (7) connects the second input of reduction reactor (1),
Reduction reactor (1) is for realizing coal and CuWO
4reduction reaction; There is oxidation reaction in W and Cu that the first oxidation reactor (3) generates for reduction reaction, regenerates CuWO in air atmosphere
4; The CuWO of first separator (5) for generating in the first oxidation reactor (3)
4be separated with residual air; The CuWO of decomposition reactor (4) for oxidation reaction in the first oxidation reactor (3) is generated
4, decompose under steam atmosphere, produce O
2, Cu
2o and WO
2; Second separator (6) is for producing O by decomposing in decomposition reactor (4)
2and solid product Cu
2o, WO
2be separated; Second oxidation reactor (8) is for decomposing the Cu produced in decomposition reactor (4)
2o and WO
2, then there is oxidation reaction in air atmosphere, again form CuWO
4, return reduction reactor (1) thus form circulation; The CO that 3rd separator (10) produces for reduction reaction in reduction reactor (1)
2, steam and the flying dust that carries be separated; The O of condenser (7) for producing in decomposition reactor (4)
2and the condensation separation of residual water vapor thus obtained pure O
2.
3. coal powder burner according to claim 2, it is characterized in that, the output of described condenser connects reduction reactor by four jet pipes, and four jet pipes connect the corner of reduction reactor respectively 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.
4. the coal powder burner according to Claims 2 or 3, 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.
5. the coal powder burner according to Claims 2 or 3, it is characterized in that, also comprise the 4th separator and flying dust trap, the input of the 4th separator connects the second output of reduction reactor, and the output of the 4th separator connects the input of flying dust trap.
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|---|---|---|---|
| CN201210546237.0A CN103062787B (en) | 2012-12-15 | 2012-12-15 | Method and device for burning pulverized coal with self-heating oxygen generation function |
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| CN103387209B (en) * | 2013-08-01 | 2015-04-01 | 北京科技大学 | Continuously-running moving bed chemical-looping reaction system |
| 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 |
| 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 |
| 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 |
| CN106902837B (en) * | 2017-03-31 | 2019-07-19 | 天津大学 | A kind of load-type nickel tungsten bimetal composite oxide and its preparation method and application |
| CN107189768B (en) * | 2017-04-10 | 2019-10-18 | 北京科技大学 | It is a kind of for simulating the spontaneous heating analog material and preparation method in goaf temperature field |
| CN108083236B (en) * | 2018-01-25 | 2024-02-02 | 华中科技大学 | Chemical chain circulation oxygen generation system based on perovskite type oxide |
| CN109439369B (en) * | 2018-12-29 | 2020-12-29 | 新奥科技发展有限公司 | Coal-based chemical chain gasification method |
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| CN101261010B (en) * | 2008-04-22 | 2011-06-08 | 青岛科技大学 | Double distribution plate coal-base serial fluidized-bed chemical chain combustion apparatus |
| CN101349423B (en) * | 2008-09-05 | 2010-07-21 | 西安交通大学 | Double-circulating fluid bed system for chemical chain combustion |
| FR2945034B1 (en) * | 2009-04-29 | 2012-06-08 | Inst Francais Du Petrole | INTEGRATED METHOD OF GENERATING ENERGY AND / OR SYNTHESIS GAS BY IN SITU OXYGEN PRODUCTION, CHEMICAL LOOP COMBUSTION AND GASIFICATION |
| CN101666546B (en) * | 2009-09-30 | 2011-11-30 | 华中科技大学 | Pulverized coal combustion method and device with function of capturing CO2 |
| CN101746720B (en) * | 2009-09-30 | 2012-07-04 | 华中科技大学 | Method and device for zero emission of CO2 from burning coal |
| CN101699187B (en) * | 2009-10-21 | 2012-06-13 | 东南大学 | Coal combustion apparatus capable of separating carbon dioxide and separation method thereof |
| US8404909B2 (en) * | 2009-12-09 | 2013-03-26 | Chevron U.S.A. Inc. | Method for capturing carbon dioxide from biomass pyrolysis process |
| CN101870455B (en) * | 2010-07-08 | 2012-05-09 | 华中科技大学 | Chain type hydrogen and oxygen production integrated method and device |
| US20120214106A1 (en) * | 2010-10-13 | 2012-08-23 | Song Sit | Chemical looping combustion |
| CN102313283B (en) * | 2011-08-30 | 2014-02-12 | 东南大学 | Coal chemical looping combustion method by using pressurized two-circuit circulating fluidized bed |
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