CN101907294B - Low-NOx combustion method of cyclone furnace and liquid slag waste heat recycling system of cyclone furnace - Google Patents
Low-NOx combustion method of cyclone furnace and liquid slag waste heat recycling system of cyclone furnace Download PDFInfo
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- CN101907294B CN101907294B CN2010102574341A CN201010257434A CN101907294B CN 101907294 B CN101907294 B CN 101907294B CN 2010102574341 A CN2010102574341 A CN 2010102574341A CN 201010257434 A CN201010257434 A CN 201010257434A CN 101907294 B CN101907294 B CN 101907294B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
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Abstract
The invention discloses a low-NOx combustion method of a cyclone furnace and a liquid slag waste heat recycling system of a cyclone furnace. In the method, oxygen-rich air (O2 concentration is more than 21%) is introduced through a cyclone secondary air inlet to realize staged air blow to a greater extent in a cyclone so as to greatly reduce the generation of contaminant NOx in the combustion process of the cyclone furnace and mitigate environmental pollution. The liquid slag waste heat recycling system of a cyclone furnace recycles the heat of a large amount of steam generated in the liquid slag granulating process and high-temperature slag granulating water. The invention not only can greatly reduce the generation of contaminant NOx in the combustion process of the cyclone furnace and mitigate environmental pollution, but also can recycle the large amount of physical sensible heat of the liquid slag in the cyclone furnace. Besides, the invention improves the thermal efficiency of the furnace, reduces the steam extraction capacity of the heat regenerative system, enhances the generated output of the set, reduces coal consumption for generation, saves water resources, improves the granulating quality of the liquid slag, decreases the heat pollution of industrial water and the environmental heat pollution caused by a large amount of steam exhausted to the atmosphere, and mitigates the heat island effect of the factory district, thereby having obvious socioeconomic benefits and environmental benefits.
Description
The method field:
The invention belongs to the cyclone furnace application, relate to the low NO of a kind of cyclone furnace
xCombustion method and liquid slag heat recovery system thereof, low NO simultaneously proposed by the invention
xCombustion method also is applicable to other boiler shapes, and the slag tap heat recovery system that is proposed is particularly useful for having the combustion apparatus field of slag tap, like blast furnace ironmaking, metallurgy industry etc.
Background method:
Cyclone furnace is meant and adopts the power of cyclone firing mode to use steam boiler.The air driven fuel particle is called cyclone firing during rotary combustion in cylinder; Cyclone firing is a kind of stable, the controlled high speed swirl flame stream of artificial tissue; It is filled in the whole bags, has extremely strong disturbance ability, has higher calorific intensity than one chamber combustion mode.The cylinder that mainly burns in the cyclone furnace is called the whirlwind tube, and a cyclone furnace can have one or several whirlwind tubes.Owing to have very high ignition temperature and combustion intensity in the whirlwind tube, the slag that can make burning form melts and sticks to and forms the liquid slag film on the barrel, and the liquid slag expelling tube forms slag tap outward.
Cyclone furnace has very high ignition temperature and very strong turbulent flow mixing intensity, and good heat transfer and mass transfer condition can fully guarantee the completing combustion of fuel, and its loss of the inadequacy burning for chemistry mechanics reason, unburned carbon loss are all less.Phosphorus content in the deslagging one all less than 0.2%, the phosphorus content in the flying dust is far below one coal-powder boiler, the flying dust share also is significantly less than coal-powder boiler.In cyclone furnace; Burning is irrelevant with the character of fuel, does not have combustion of arguing or inflammable fuel and can in cyclone furnace, stablize and burning fully, simultaneously because its fuel only needs broken; Thereby can simplify even cancel huge pulverized coal preparation system greatly, practice thrift the powder process power consumption.
Compare with coal-powder boiler, the advantage of cyclone furnace is mainly reflected in the following aspects:
High disturbance performance and high-temperature level in the whirlwind tube are the bases of cyclone furnace overheavy firing.Adopt cyclone furnace, the metal wastage of whole cooker stove is greatly reduced, compare with the coal-powder boiler with capacity, can make the area of boiler room dwindle 25%, the boiler room volume dwindles 30%, and weight reduces 20～25%.
For cyclone furnace, have only 15～30% ash content entering convection pass, and be generally the ash content process convection heating surface about 80%, thereby the wearing and tearing of cyclone furnace convection heating surface are more light than coal-powder boiler for pulverized-coal fired boiler.The air-flow that rotates at a high speed in the whirlwind tube has the ability of very high separation slag, and the retention efficiency of various types of cyclone furnaces is substantially between 70～85%.
The high retention efficiency of cyclone furnace can reduce the flying dust amount that flue gas is taken away widely, itself just is equivalent to an efficient and is 70～85% deduster, therefore compares with coal-powder boiler, can practice thrift 1/3rd of deduster gross investment, remarkable in economical benefits.
Because disturbance is strong in the whirlwind tube, can adopt low oxygen combustion, one is 1.05～1.1 for the excess air coefficient in the whirlwind tube, thereby can reduce heat loss due to exhaust gas.
In cyclone furnace, owing to have very high ignition temperature (common more than 1649 ℃) and disturbance ability, burning is irrelevant with the character of fuel, does not have combustion of arguing or inflammable fuel and can in cyclone furnace, stablize and completing combustion.
Can find out that from above cyclone furnace has very superior advantage, still, it is not " perfect in every way ", has some shortcomings and problem yet, and wherein maximum shortcoming and problem comprise following two aspects:
◆ pollutant NO
xGenerate high;
Owing to have very high ignition temperature and strong turbulent flow mixing intensity in the whirlwind tube, make its pollutant NO
xGrowing amount to exceed much than one coal-powder boiler; And the strict day by day environment protectment protection of this and China is antipathetic, as China in " thermal power plant's atmosphere pollutants emission standards " of new enforcement on January 1 in 2010 to the pollutant NO of the 3rd period of coal-burning boiler
xConcentration of emission is defined as: the key area is 200mg/m
3Other areas are 400mg/m
3Though at various reduction NO
xMethod in the air stage feeding method be a kind of very cost-effective method that has been widely used; But; When the air stage feeding method is applied to the cyclone furnace field; Along with the reduction of excess air coefficient in the whirlwind tube, the temperature levels in the whirlwind tube also and then has reduction largely, and this can constitute a threat to keeping normal slag tap.Therefore; Owing to receive the restriction of the minimum excess air coefficient that slag tap normally carries out in the whirlwind tube; Make that the degree of the air stage feeding that can reach in the whirlwind tube is limited, its minimum excess air coefficient thereby makes the reduction NO that this method of air stage feeding is had greatly about about 0.8
xAbility be not in full use.
◆ the slag tap heat loss due to sensible heat in slag is big.
The whirlwind furnace liquid deslagging has very high temperature; One is about about 1400 ℃, will emit great amount of heat when it runs into when flushing cinder cooling water about 25 ℃ sharply cools off granulation, produces a large amount of steam and the big flushing cinder water of amount temperature about 85～90 ℃; For a long time; This part heat all can not get reasonable use, but wastes, and a large amount of steam that produce and flushing cinder water can cause environmental thermal pollution after entering environment.When flushing cinder water recycles,, certainly will cause liquid slag granulation rate to descend simultaneously along with the rising gradually of circulation flushing cinder coolant-temperature gage; Form coking amount increase in the granulation case, can cause stifled slag when serious, cause shutdown of boiler; Therefore, have to replenish the temperature that a large amount of new water reduces circulation flushing cinder water, and this will consume great amount of water resources; Particularly lack the area for water resource, this will produce serious social danger.
In order to manage to reduce NO in the cyclone furnace
xGenerate, proposed a kind of pure oxygen burning cyclone furnace scheme among United States Patent (USP) WO 2007/117243 A1, through burning, though this scheme can reach reduction NO mixing to send in the burner hearth with flue gas after the airborne oxygen separation
xPurpose, but owing to will separate system oxygen to the required air that burns, this is with the financial cost of labor, and this scheme can only reduce heating power type NO
xGeneration, and to fuel type NO
xThe basic unrestraint effect of generation, even can increase fuel type NO on the contrary
xGeneration, this scheme fails to consider that a large amount of heats that the whirlwind furnace liquid deslagging is had recycle simultaneously, makes this part heat can not get reasonable utilization, and is wasted.Similar with it, in U.S. patent WO 2008/151271 A1 subsequently, a kind of reduction cyclone furnace NO has been proposed
xThe system and method for discharging, through send in the import of whirlwind tube secondary wind part oxygen and upper furnace set up coal dust again burner reach and reduce NO
xPurpose, though this method can reduce NO in the combustion process greatly
xGeneration; But same the existence has very expensive air-separating oxygen-making process, and therefore this method needs the extra cover fuel pulverized coal preparation system of setting up owing to need to adopt the coal powder recombustion; Increase the powder process power consumption; The advantage that makes the cancellation pulverized coal preparation system that cyclone furnace itself had and practice thrift the powder process power consumption is had a greatly reduced quality, and this method fails equally to consider that slag tap has the big problem of heat loss due to sensible heat in slag simultaneously, and this part heat is not carried out the secondary recovery utilization.
Summary of the invention:
To the existing existing shortcoming and defect of patent of invention at present relevant cyclone furnace field, the present invention proposes a kind of cyclone furnace low NOx combustion method and slag tap heat recovery system thereof, its purpose is, reduces the pollutant NO in the cyclone furnace combustion process
xDischarging and slag tap heat loss due to sensible heat in slag.
In order to realize above-mentioned task, the present invention solves through following technical scheme:
A kind of cyclone furnace hangs down NO
xCombustion method is connected with boiler furnace the whirlwind tube through scum pipe; The OFA spout is set above boiler furnace; Wind inlet and burner are set at whirlwind tube top; The secondary wind import is set above the whirlwind tube; At the whirlwind tube bottom granulation water tank is being set; The secondary wind of sending into through the secondary wind import is an oxygen concentration greater than 21% oxygen-enriched air; Excess air coefficient scope in the control whirlwind tube 1 is 0.5～0.7; Send at the OFA spout and to reach the required surplus air of completing combustion, its excess air coefficient is 1.1～1.2.
Said whirlwind tube adopts vertical layout, horizontal layout or vertical horizontal multi-layer to arrange; Said multilayer arranges it is that single-sided arrangement, bilateral liquidate and arrange or the bilateral layout that do not liquidate;
The outside weld of water-cooling wall pipe has the close pin of putting in the said whirlwind tube, lays one deck refractory lining between pin.
A kind of whirlwind furnace liquid deslagging heat recovery system, said system comprises steam waste heat recovery system and using exhaust heat of slag flushing water recovery system; Said steam waste heat recovery system all is connected with liquid slag granulation water tank with the using exhaust heat of slag flushing water recovery system.
Said steam waste heat recovery system comprises dividing wall type heat exchanger and several valves; Said dividing wall type heat exchanger is connected with power plant condensation water low-pressure heater loop through several valves; Said using exhaust heat of slag flushing water recovery system comprises separate type heat pipe exchanger, water circulating pump and sedimentation and filtration ditch; Said sedimentation and filtration ditch and water circulating pump are serially connected between liquid slag granulation water tank and the separate type heat pipe exchanger evaporator section; The condensation segment of said separate type heat pipe exchanger is connected in series with steam turbine, generator, working medium condenser and working medium pump successively and forms the low-temperature electricity-generating closed circuit; Possibly carry out heating to power plant dependents' district and peripheral user residential area when considering winter, so this residual neat recovering system is connected with the winter heating system.
Said steam waste heat recovery system comprises dividing wall type heat exchanger and several valves; Said dividing wall type heat exchanger is serially connected in the power plant condensation water low-pressure heater loop through several valves; Said using exhaust heat of slag flushing water recovery system comprises separate type heat pipe exchanger, sedimentation and filtration ditch and water circulating pump; Said sedimentation and filtration ditch and water circulating pump are serially connected between liquid slag granulation water tank and the separate type heat pipe exchanger evaporator section successively; The condensation segment of said separate type heat pipe exchanger is connected with power plant condensation water low-pressure heater loop through valve.
The evaporator section of said separate type heat pipe exchanger adopts corrosion-resistant steel, condensation segment to adopt common iron.
Its basic principle is following:
Air stage feeding is NO in a kind of very cost-effective reduction combustion process that has been widely used
xThe method of discharging; Yet, when the air stage feeding technology is applied to the cyclone furnace field, along with the reduction of excess air coefficient in the whirlwind tube; Make the temperature levels in the whirlwind tube also and then have reduction largely, this just might constitute a threat to keeping normal slag tap.Therefore; Owing to receive the restriction of the minimum excess air coefficient that slag tap normally carries out in the whirlwind tube; Make that the degree of the air stage feeding that can reach in the whirlwind tube is limited, its minimum excess air coefficient thereby makes the reduction NO that air stage feeding had greatly about about 0.8
xAbility be not in full use.For this reason, the present invention proposes a kind of air of sending into oxygen enrichment (O wherein
2Concentration greater than 21%) new thought: on the basis of cyclone furnace air stage feeding; Send into the air of oxygen enrichment through the import of whirlwind tube secondary wind; Because the increase of oxygen concentration in the whirlwind tube makes that the ignition temperature in the whirlwind tube improves greatly, can also make pollutant NO simultaneously
xGeneration the reduction of less degree is arranged; And through the largest benefit that air brought that oxygen enrichment is sent in the import of whirlwind tube secondary wind be: because the raising greatly of temperature in the whirlwind tube; Make the restriction keep the minimum excess air coefficient that slag tap normally carries out can reach lower; Be that (its excess air coefficient is 0.5～0.7 to the air stage feeding that can reach deeper degree in the whirlwind tube; Even lower), and can be to normally not the constituting a threat to of whirlwind furnace liquid deslagging, thereby the air stage feeding reduction NO that has that technology has made
xAbility farthest brought into play, reduce pollutant NO in the combustion process greatly
xGeneration.
It is characterized in that:
Said whirlwind tube can be divided into vertical and horizontal two kinds; And can adopt a plurality of whirlwind tubes based on needs; Carry out multilayer and arrange (when adopting multilayer to arrange, consider the restriction of arrangement space, can adopt multi-layer intercrossed layout) for vertical whirlwind tube; Can adopt single-sided arrangement when simultaneously multilayer is arranged, bilateral layout, the bilateral modes such as layout that do not liquidate that liquidate; The outside weld of water-cooling wall pipe has the close pin of putting in the whirlwind tube, lays one deck refractory lining between pin;
Excess air coefficient scope in the said whirlwind tube is 0.5～0.7, even lower, is strong reducing property atmosphere;
The secondary wind of sending into through the secondary wind import is the air of oxygen enrichment, and wherein concentration of oxygen is greater than 21% (concentration of oxygen of specifically sending into is relevant with the actual coal that uses, and has an optimal value, can confirm through test);
Reach the required surplus air of completing combustion and sent into by the OFA spout, its excess air coefficient is approximately about 1.1～1.2;
The OFA spout of sending into the required surplus air of completing combustion can be according to concrete needs arranging multiplayer, and the air output of each interlayer can equate or do not wait.
A kind of whirlwind furnace liquid deslagging heat recovery system; The waste heat that a large amount of steam that produce during respectively to the liquid slag granulation and the flushing cinder water (about about 85 ℃) that has higher temperature are in a large number had has carried out the secondary recovery utilization, has proposed two kinds of alternative plans.In scheme 1; Waste heat recovery to steam and flushing cinder water includes two kinds of alternative recovery approach respectively; The one, heating is carried out in power plant dependents' district and the peripheral user residential area that need heat winter; The 2nd, utilize steam to heat condensate from power plant's one-level heater; Flushing cinder water is used for low-temperature cogeneration, obtains high-grade electric energy, and its system mainly includes liquid slag granulation water tank, sedimentation and filtration ditch, water circulating pump, steam turbine, generator, working medium condenser, working medium pump, separate type heat pipe exchanger, dividing wall type heat exchanger, valve.In scheme 2; The waste heat that steam that produces during with the liquid slag granulation and flushing cinder water are had all is used for heating the condensate from power plant's one-level heater, and its system mainly includes liquid slag granulation water tank, sedimentation and filtration ditch, water circulating pump, separate type heat pipe exchanger, dividing wall type heat exchanger, valve.In the practical implementation process, can only recycle based on concrete actual needs to the waste heat that steam or flushing cinder water are had.
It is characterized in that:
Heat recovery to the whirlwind furnace liquid deslagging has proposed two kinds of schemes that can supply the user to select respectively, thereby has widened the scope of application of the present invention greatly;
Using exhaust heat of slag flushing water in scheme 1 reclaims in the power generation cycle loop; The cycle fluid of being selected for use is in 80～40 ℃ of scopes, having big enthalpy drop, power pressure low boiling working fluid moderate, with low cost, like chloroethanes, F-11, F-12, liquefied ammonia, R134a etc.;
When steam that when utilizing the liquid slag granulation, produces or using exhaust heat of slag flushing water add the condensate of steam power plant's a certain level heater; Consider the optimization problem of whole system; Concrete condensate from which rank of heater of power plant is drawn and from which rank of is returned the former heater system all and concrete therrmodynamic system relating to parameters; Need to confirm, represent the optimal value that it is corresponding with small letter English alphabet i, j, m, n in the present invention for this reason through calculating;
When steam that when utilizing the liquid slag granulation, produces or using exhaust heat of slag flushing water add the condensate of steam power plant's a certain level heater; Its Heating Cyclic loop bind mode in whole heater system can adopt series system also can adopt parallel way; Specifically relevant with actual therrmodynamic system, need confirm by computation optimization;
Consider that the flushing cinder glassware for drinking water has certain corrosive characteristics, the heat exchanger of therefore when it is carried out waste heat recovery, being selected for use is a separate type heat pipe exchanger, and its evaporator section adopts corrosion-resistant steel, and condensation segment adopts common iron.
Description of drawings:
Fig. 1 is the low NO of a kind of cyclone furnace of the present invention
xThe structural representation of combustion method part, each label is represented respectively among the figure: 1, whirlwind tube; 2, coal dust and a wind inlet; 3, burner; 4, secondary wind import; 5, granulation water tank; 6, scum pipe; 7, OFA spout; 8, boiler furnace;
Fig. 2 is the structural representation of whirlwind furnace liquid deslagging heat recovery components of system as directed scheme 1 of the present invention, and each label is represented respectively among the figure: 9, liquid slag granulation water tank; 10, sedimentation and filtration ditch; 11, water circulating pump; 12, steam turbine; 13, generator; 14, working medium condenser; 15, working medium pump; 16, separate type heat pipe exchanger; 17, dividing wall type heat exchanger; 18, first valve; 19, second valve; 20, the 3rd valve;
Fig. 3 is the structural representation of whirlwind furnace liquid deslagging heat recovery components of system as directed scheme 2 of the present invention, and each label is represented respectively among the figure: 9, liquid slag granulation water tank; 10, sedimentation and filtration ditch; 11, water circulating pump; 16, separate type heat pipe exchanger; 17, dividing wall type heat exchanger.
The specific embodiment:
Below in conjunction with accompanying drawing the present invention is done and to describe in further detail:
Referring to Fig. 1, a kind of cyclone furnace hangs down NO
xCombustion method, said cyclone furnace adopts the mode of air stage feeding, and sends into the air of oxygen enrichment in the import of whirlwind tube secondary wind; The air of said oxygen enrichment is meant contained O in the air
2Concentration of volume percent greater than 21% air (concentration of oxygen of specifically sending into is relevant with the actual coal that uses, and has an optimal value, can confirm through test).
Include whirlwind tube 1, coal dust and wind inlet 2, burner 3, secondary wind import 4, granulation water tank 5, scum pipe 6, OFA spout 7 and a boiler furnace 8.
In the practical implementation process; Above-mentioned whirlwind tube 1 is arranging multiplayer as required, and can adopt single-sided arrangement, bilateral layout, the bilateral modes such as layout that do not liquidate that liquidate; And the outside weld of water-cooling wall pipe has the close pin of putting in the whirlwind tube 1, lays one deck refractory lining between pin;
Excess air coefficient scope in the said whirlwind tube is 0.5～0.7, strong reducing property atmosphere;
Reach the required surplus air of completing combustion and sent into by OFA spout 7, its excess air coefficient is approximately about 1.1～1.2;
The OFA spout 7 of sending into the required surplus air of completing combustion can be according to concrete needs arranging multiplayer, and the air output of each interlayer can equate or do not wait.
Its course of work is, on the basis of cyclone furnace air stage feeding, sends into the air (O wherein of oxygen enrichment through the import of whirlwind tube secondary wind
2Concentration greater than 21%), because the increase of oxygen concentration in the whirlwind tube makes that the ignition temperature in the whirlwind tube improves greatly, can also make pollutant NO simultaneously
xGeneration the reduction of less degree is arranged; And through the largest benefit that air brought that oxygen enrichment is sent in the import of whirlwind tube secondary wind be: because the raising greatly of temperature in the whirlwind tube; Make the restriction keep the minimum excess air coefficient that slag tap normally carries out can reach lower; Be that (its excess air coefficient is 0.5～0.7 to the air stage feeding that can reach deeper degree in the whirlwind tube; Even lower), and can be to normally not the constituting a threat to of whirlwind furnace liquid deslagging, thereby the air stage feeding reduction NO that has that technology has made
xAbility farthest brought into play, reduce pollutant NO in the combustion process greatly
xGeneration.
A kind of whirlwind furnace liquid deslagging of the present invention heat recovery system; The waste heat that a large amount of steam that produce during to the liquid slag granulation and the flushing cinder water that has higher temperature in a large number (about about 85 ℃) are had has carried out the secondary recovery utilization; Two kinds of alternative plans have been proposed; Wherein scheme 1 is as shown in Figure 2, and scheme 2 is as shown in Figure 3.
Referring to Fig. 2; In scheme 1; The waste heat that steam that produces during the liquid towards slag particle and flushing cinder water are had has adopted different recoverying and utilizing methods except that considering that power plant dependents' district and the peripheral user residential area that need heat to winter carry out the heating, and wherein steam is used for heating the condensate from power plant's one-level heater; Flushing cinder water is used for low-temperature cogeneration, obtains the high-grade electric energy.Its system mainly includes liquid slag granulation water tank 9, sedimentation and filtration ditch 10, water circulating pump 11, steam turbine 12, generator 13, working medium condenser 14, working medium pump 15, separate type heat pipe exchanger 16, dividing wall type heat exchanger 17, first valve 18, second valve 19, the 3rd valve 20.
Its detailed process is following:
About about the 100 ℃ vapor stream that produces during the liquid slag granulation is through dividing wall type heat exchanger 17; Discharge through condensation heat transfer and to become condensate after the latent heat of vaporization and return in the granulation water tank with after flushing cinder water and initiate flushing cinder cooling water water mix and be used for the liquid slag that the granulation boiler is discharged, accomplish recycle; Draw after the condensate of the i of power plant level heater is flowed through the latent heat that discharges when dividing wall type heat exchanger 17 absorption steam condense and return in the former heater system.Wherein first valve 18 can be used for controlling the concrete connected mode of Steam Heating loop and former heater system, i.e. still parallel connection of series connection is when first valve 18 is closed and is connected in series, and opens the Shi Zewei mode that is connected in parallel.Under the prerequisite that is connected in parallel; Promptly first valve 18 is in open mode; Can get back to former heater system from i level heater through steam-heated condensate circuit; Also can get back to former heater system, also can be divided into two-way and get back to former heater system from i, j level heater respectively, specifically need carry out optimization computation and confirm according to the therrmodynamic system parameter of reality from the j level.
The temperature that produces during the liquid slag granulation is about 85 ℃ of left and right sides flushing cinder water; Earlier through sedimentation and filtration ditch 10; Remove the impurity particle that is contained in the flushing cinder water; The evaporator section of separate type heat pipe exchanger 16 of under the effect of water circulating pump 11, flowing through is then emitted heat, considers that flushing cinder water possibly have certain corrosiveness, and the separate type heat pipe exchanger evaporator section adopts corrosion-resistant steel; Emit temperature behind the heat and reduce to flushing cinder water about 50 ℃ and return and be used for the granulation slag tap in the granulation water tank, accomplish recycle; The low boiling cycle fluid becomes the superheated steam about 80 ℃ after in the condensation segment of separate type heat pipe exchanger 16, absorbing heat; Get into steam turbine 12 expansion actings then; Drive generator 13 generatings, the working medium after the acting becomes low-pressure superheated steam, and low-pressure superheated steam is emitted heat via working medium condenser 14; Become the liquid working substance of low-temp low-pressure, under the effect of working medium circulating pump 15, get into absorption flushing cinder water heat release completion cyclic process in the heat exchanger 16 once more.
Referring to Fig. 3; In scheme 2; The waste heat that steam that produces during with the liquid slag granulation and flushing cinder water are had all is used for heating the condensate from power plant's one-level heater, and its system mainly includes liquid slag granulation water tank 9, sedimentation and filtration ditch 10, water circulating pump 11, separate type heat pipe exchanger 16, dividing wall type heat exchanger 17, first valve 18, second valve 19, the 3rd valve 20.
Its detailed process is following:
About about the 100 ℃ steam that produces during the liquid slag granulation dividing wall type heat exchanger 17 of flowing through; Discharge and to become condensate after the latent heat of vaporization and return in the granulation water tank and the liquid slag that is used for the discharge of granulation boiler after flushing cinder water and initiate flushing cinder cooling water water mix, recycle; Draw after the condensate of the j of power plant level heater is flowed through the latent heat that discharges when dividing wall type heat exchanger 17 absorption steam condense and get back to former heater system from m level heater.
The temperature that produces during the liquid slag granulation is about 85 ℃ of left and right sides flushing cinder water; Earlier through sedimentation and filtration ditch 10; Remove the impurity particle that is contained in the flushing cinder water; Emit heat at the dirty evaporator section of crossing separate type heat pipe exchanger 16 of the effect of water circulating pump 11 then, consider that flushing cinder water possibly have certain corrosiveness, the separate type heat pipe exchanger evaporator section adopts corrosion-resistant steel; Emit temperature behind the heat and reduce to flushing cinder water about 50 ℃ and return and be used for the granulation slag tap in the granulation water tank, accomplish recycle; Drawing flows through from the condensate of the i of power plant level heater gets back to former heater system from n level heater after the condensation segment of separate type heat pipe exchanger 16 absorbs heat.
A kind of cyclone furnace proposed by the invention hangs down NO
xCombustion method and slag tap heat recovery system thereof can not only reduce pollutant NO in the cyclone furnace combustion process greatly
xGeneration, alleviate environmental pollution, and the whirlwind furnace liquid deslagging heat recovery system that is proposed; The heat that a large amount of steam that produce during through liquid towards slag particle respectively and the flushing cinder water of high temperature are had is recycled, and reduces boiler ash physics heat loss greatly, improves boiler thermal output; Reduce the amount of drawing gas of heat regenerative system, improve unit generation and exert oneself, reduce gross coal consumption rate; Steam and the flushing cinder water circulation use behind the heat recovery and utilization simultaneously, granulation whirlwind furnace liquid deslagging can the conserve water resource; Improve the granulation quality of liquid slag; The thermal pollution and a large amount of steam that reduce industry water enter the environmental thermal pollution that is caused behind the atmosphere, alleviate the factory district tropical island effect, have significant social economic benefit and environmental benefit.
Above content is to combine concrete preferred implementation to further explain that the present invention did; Can not assert that the specific embodiment of the present invention only limits to this; Those of ordinary skill for technical field under the present invention; Under the prerequisite that does not break away from the present invention's design, can also make some simple deduction or replace, all should be regarded as belonging to the present invention and confirm scope of patent protection by claims of being submitted to.
Claims (3)
1. a cyclone furnace hangs down NO
xCombustion method is characterized in that: the whirlwind tube is connected through scum pipe with boiler furnace; The OFA spout is set above boiler furnace; Wind inlet and burner are set at whirlwind tube top; The secondary wind import is set above the whirlwind tube; At the whirlwind tube bottom granulation water tank is set; The secondary wind of sending into through the secondary wind import is an oxygen concentration greater than 21% oxygen-enriched air; Excess air coefficient scope in the control whirlwind tube is 0.5～0.7; Send at the OFA spout and to reach the required surplus air of completing combustion, its excess air coefficient is 1.1～1.2.
2. a kind of according to claim 1 cyclone furnace hangs down NO
xCombustion method is characterized in that: said whirlwind tube adopts vertical layout, horizontal layout or vertical horizontal multi-layer to arrange; Said multilayer arranges it is that single-sided arrangement, bilateral liquidate and arrange or the bilateral layout that do not liquidate.
3. a kind of according to claim 1 cyclone furnace hangs down NO
xCombustion method is characterized in that: the outside weld of water-cooling wall pipe has the close pin of putting in the said whirlwind tube, lays one deck refractory lining between pin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102574341A CN101907294B (en) | 2010-08-19 | 2010-08-19 | Low-NOx combustion method of cyclone furnace and liquid slag waste heat recycling system of cyclone furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102574341A CN101907294B (en) | 2010-08-19 | 2010-08-19 | Low-NOx combustion method of cyclone furnace and liquid slag waste heat recycling system of cyclone furnace |
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|---|---|---|---|
| CN2011101356664A Division CN102221198B (en) | 2010-08-19 | 2010-08-19 | Low NOx combustion method for cyclone furnace and liquid state slagging and afterheat recycling system for cyclone furnace |
Publications (2)
| Publication Number | Publication Date |
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| CN101907294A CN101907294A (en) | 2010-12-08 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102039070A (en) * | 2010-05-04 | 2011-05-04 | 陈志伟 | Method and equipment for separating molten dust carried by high-temperature gas and application thereof |
| CN102287813A (en) * | 2011-07-15 | 2011-12-21 | 西安交通大学 | Boiler device adopting cyclone-burning method |
| CN102721797B (en) * | 2011-09-22 | 2014-11-05 | 辽宁省电力有限公司 | Method for analysis of relevance between production of HCN/NH3 by anthracite pyrolysis and production of NOx by anthracite combustion in boiler |
| CN103411210A (en) * | 2013-08-05 | 2013-11-27 | 珠海查理科技节能环保有限公司 | Vertical fire whirl combustion device |
| CN105749361B (en) * | 2016-02-01 | 2017-10-27 | 王保朋 | A kind of self-operated type heat-exchanger rig condensate flow diverter |
| CN106287734B (en) * | 2016-09-05 | 2018-05-25 | 重庆科技学院 | Stoker fired grate formula refuse gasification incineration system and synthesis gas parameter feedback burner |
| CN106224969B (en) * | 2016-09-05 | 2018-04-13 | 重庆科技学院 | Stoker fired grate formula refuse gasification incineration system and vortex burner |
| CN108278617A (en) * | 2018-03-06 | 2018-07-13 | 上海发电设备成套设计研究院有限责任公司 | Municipal refuse cyclone burning system and its coupling coal fired power plant electricity generation system and method |
| CN110094718A (en) * | 2019-05-28 | 2019-08-06 | 武汉武锅能源工程有限公司 | A kind of low dirt smoke generating apptss and method using pyrolysis waste coke |
| CN111678122A (en) * | 2020-06-08 | 2020-09-18 | 苏州臻越流体设备有限公司 | Low nox combustion system of cyclone furnace based on ccd |
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| CN2198506Y (en) * | 1994-07-05 | 1995-05-24 | 上海交通大学 | Vertical rear trap slag tube bundle whirlwind boiler with ring room |
| CN1666065A (en) * | 2002-05-15 | 2005-09-07 | 普莱克斯技术有限公司 | Low NOx combustion |
| CN1707160A (en) * | 2005-05-23 | 2005-12-14 | 哈尔滨工业大学 | W-shape flame furnace with gradation coal burner |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1259525C (en) * | 2004-12-30 | 2006-06-14 | 哈尔滨工业大学 | Method of processing refuse burning fly ash through cyclone furnace high temperature melting |
| WO2007117243A1 (en) * | 2006-04-11 | 2007-10-18 | The Babcock & Wilcox Company | Cyclone furnace for oxygen fired boilers with flue gas recirculation |
| US20090007827A1 (en) * | 2007-06-05 | 2009-01-08 | Hamid Sarv | System and Method for Minimizing Nitrogen Oxide (NOx) Emissions in Cyclone Combustors |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2198506Y (en) * | 1994-07-05 | 1995-05-24 | 上海交通大学 | Vertical rear trap slag tube bundle whirlwind boiler with ring room |
| CN1666065A (en) * | 2002-05-15 | 2005-09-07 | 普莱克斯技术有限公司 | Low NOx combustion |
| CN1707160A (en) * | 2005-05-23 | 2005-12-14 | 哈尔滨工业大学 | W-shape flame furnace with gradation coal burner |
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