CN103953921A - Oxygen-enriched combustion boiler system and operation method thereof - Google Patents
Oxygen-enriched combustion boiler system and operation method thereof Download PDFInfo
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- CN103953921A CN103953921A CN201410161979.0A CN201410161979A CN103953921A CN 103953921 A CN103953921 A CN 103953921A CN 201410161979 A CN201410161979 A CN 201410161979A CN 103953921 A CN103953921 A CN 103953921A
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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
Abstract
The invention discloses an oxygen-enriched combustion boiler system and an operation method thereof. The oxygen-enriched combustion boiler system is capable of meeting the emission standard and retarding device corrosion. A denitration device is arranged between a tail part flue of the oxygen-enriched combustion boiler system and a preheater; a heat radiation smoke outlet of the preheater is connected with a heat radiation smoke inlet of a smoke heat exchanger through a dust remover; a heat radiation smoke outlet of the smoke heat exchanger is connected with a desulfurization device and a smoke cooler in sequence and is then returned to a heat absorption smoke inlet of the smoke heat exchanger; a part of the primary air of a combustor is fed into the combustor through a primary air oxygen injector after passing through the preheater and the rest part of the primary air of the combustor is used for pulverizing; the secondary air of the combustor enters the preheater through a secondary air oxygen injector and then is fed into the combustor. The operation method of the oxygen-enriched combustion boiler system emphatically controls the content of water vapor in recycling smoke and the circulation ratio of the recycling smoke and independently adjusts the oxygen injection ratios and amounts of the primary air and the secondary air. The oxygen-enriched combustion boiler system is environment-friendly and easy to implement, and has both oxygen injection safety and economy performances.
Description
Technical field
The present invention relates to a kind of boiler, especially a kind of oxygen-enriched combustion boiler system and operation method thereof.
Background technology
Carbon dioxide is generally considered one of major reason causing global warming because having greenhouse effects.Fossil energy utilization is most important CO
2emission source, if Global Emissions of Greenhouse Gas amount is pressed to industry statistic, power industry is maximum emission source, and coal fired power generation is CO in power industry
2the main source of discharge, oxygen-enriched combusting is a kind of CO for fossil fuel generating
2reduce discharging solution.
Oxygen-enriched combusting mode is in existing station boiler system-based, with the gas containing high-concentration oxygen, replaces conventional combustion air, obtains the CO that is rich in 80% above volumetric concentration by flue gas recirculation simultaneously
2flue gas, after further condensation compression purifying, realizes CO
2forever seal up for safekeeping or a kind of combustion system of recycling.This novel combustion system and existing power station combustion system have good connection in technology, comparatively easily realize large-scale CO
2enrichment and reduction of discharging, also easily accepted by power industry.The main feature of this combustion system is to adopt flue gas recirculation, with the CO in flue gas
2substitute the nitrogen in combustion air, participate in burning together with oxygen, can increase substantially the CO in flue gas like this
2concentration, facilitates CO
2utilization and processing, be expected to form the eco-friendly generation mode of " chimney-free " that a kind of pollutant comprehensive discharge is low.Existing analysis shows, compares with other carbon acquisition modes, and oxygen-enriched combustion technology is at cost of investment, operating cost, CO
2reduce discharging cost, maximization and all there is superiority with the aspects such as compatibility of prior art.
But the problem below having occurred in oxygen-enriched combusting operation test: the one, the NOx concentration in flue gas can surpass state environmental emissioning standard, and the 2nd, the corrosion aggravation to cigarette air channel, burner hearth, heating surface etc.One, oxygen-enriched combusting is owing to adopting flue gas recirculation, can there is enrichment phenomenon with flue gas recirculation in the NOx in circulating flue gas, can surpass state environmental emissioning standard, therefore discharged to NOx concentration in the flue gas of atmosphere, need to take necessary measure, prevent the generation of oxygen-enriched combusting flue gas middle and high concentration NOx.
Two, oxygen-enriched combusting is owing to adopting flue gas recirculation, also can there is enrichment phenomenon with flue gas recirculation in the SOx in circulating flue gas, thereby cigarette air channel, burner hearth, heating surface etc. are produced to corrosion, need to take necessary measure, prevent the significantly increase of SOx concentration in flue gas recycled.
Summary of the invention
Technical problem to be solved by this invention be to provide a kind of can qualified discharge and oxygen-enriched combustion boiler system and the operation method thereof of slowing device corrosion phenomenon.
Inventor notices: oxygen-enriched combusting is owing to adopting flue gas recirculation, can there is enrichment phenomenon with flue gas recirculation in the NOx in circulating flue gas, SOx, yet this phenomenon is generally left in the basket: beyond boiler, gas cleaning and the steam-electric power unit of power plant, conventional oxygen-enriched combusting electricity generation system has increased the unit such as air separation, flue gas condensing, flue gas compression purifying, but does not consider the processing of nitrogen oxide and oxysulfide.
For by oxysulfide under oxygen-enriched combusting operating mode, discharged nitrous oxides concentration is controlled in the reasonable scope, first the present invention provides a kind of oxygen-enriched combustion boiler system, it comprises burner hearth, burner, after-flame wind snout, preheater, back-end ductwork, dust-precipitator and chimney, its flue gas recirculation pipeline comprises denitrification apparatus, desulfurizer and gas cooler are also followed following setting, between the heat release gas approach of the outlet of back-end ductwork and preheater, be connected with denitrification apparatus, the heat release exhanst gas outlet of preheater is connected with the heat release gas approach of flue gas heat-exchange unit through deduster, heat release exhanst gas outlet and the desulfurizer of flue gas heat-exchange unit, gas cooler connects rear tieback successively to the heat absorption gas approach of flue gas heat-exchange unit, a wind of burner is being sent into burner through preheater rear portion through a wind oxygen injector, remainder is as powder process wind, the Secondary Air of burner enters preheater and sends into burner again after Secondary Air oxygen injector.
The present invention, by arrange denitrification apparatus on tail flue gas passage, removes the NOx in flue gas, prevents that the problem of enrichment from appearring in the NOx in flue gas with flue gas recirculation, and in control flue gas recycled and discharge flue gas, NOx concentration is in OK range, in tail flue gas passage, arrange desulfurizer 10, remove the SOx in flue gas, prevent that the problem of enrichment from appearring in the SOx in flue gas with flue gas recirculation, in control flue gas recycled and discharge flue gas, SOx concentration is in OK range, prevent flue and heating surface acid corrosion, because flue gas all needs through smoke eliminator, especially after desulfurization is processed, water content can be up to 20%, in stove, adiabatic flame temperature reduces, the steady combustion of burner is difficulty relatively, therefore after desulfurization treating apparatus, gas cooler being set removes water treatment, after reducing flue gas water content, again low water content flue gas is dropped into recirculation, make adiabatic flame temperature, inner flue gas of the stove flow etc. during with air burning difference less, increase combustion stability, oxygen-enriched combusting is more easily realized in engineering.
The optimal reaction temperature interval of SCR denitration is at 300-420 ℃, this temperature range is just in time between economizer and preheater, before therefore denitrification apparatus is placed and is arranged in preheater and deduster, because can take certain moisture out of in wet-method desulfurized fume, if before being arranged in deduster, can cause deduster sticky stifled etc., therefore after desulfurizer is placed on to preheater and deduster.
In addition, from security consideration, oxygen injector is preferably disposed on the position that flue-gas temperature is lower, before entering preheater, flue gas carries out, but under oxygen-enriched combusting mode, from wind preheater a part of hot blast out will as pulverized coal preparation system with wind, do not need to note oxygen, therefore, from taking into account economy, consider, select two note oxygen points respectively wind, a Secondary Air to be noted to oxygen, also convenient adjusting wind, Secondary Air note oxygen amount separately.One time wind, Secondary Air are noted oxygen by the oxygen injector being arranged on recirculating gas duct in the ratio of setting respectively, as far as possible close with conventional air burning one, the two wind air distributions of coal dust.
Be further, the heat absorption exhanst gas outlet of flue gas heat-exchange unit separates three outlet branch roads, the first outlet branch road is connected with the secondary air inlet of burner through Secondary Air oxygen injector and preheater successively, it is the mode that Secondary Air adopts cold junction note oxygen, the second outlet branch road after preheater minute two-way separately with a wind oxygen injector, pulverized coal preparation system connects, one time wind oxygen injector is connected with a wind inlet of burner through air and powder mixer, pulverized coal preparation system is connected with powder storehouse, powder storehouse respectively with air and powder mixer, after-flame wind snout is connected with dust-precipitator, powder process can be used as after-flame wind and sends into burner hearth from after-flame air port after pulverized coal preparation system with wind, also can be used as and after weary gas is processed through gathering dust, directly send into chimney and drain, the 3rd outlet branch road is connected to carbon dioxide compression purification devices or chimney through control valve, the unnecessary flue gas of part treated but that do not need to enter flue gas recirculation can enter subsequent treatment or discharge, flue gas all needs through flue gas purification system, the exhaust gas volumn of the required processing of flue gas purification system is compared conventional air burning system and is only slightly decreased, investment is larger comparatively speaking.But because the water content of circulating flue gas is lower, adiabatic flame temperature, inner flue gas of the stove flow etc. during with air burning difference less, combustion stability is better; The most approaching when each air channel flow and air burning, so Fan Selection is relatively easy, this system and conventional air burning system difference are minimum, thereby in engineering, are easier to realize.
On described the first outlet branch road, between flue gas heat-exchange unit and preheater, set gradually the first flue gas control valve, air draft system, pressure fan and Secondary Air oxygen injector, the first flue gas control valve is used for regulating secondary air flow, air draft system is used for air draught when air burning, pressure fan is smoke power source, and Secondary Air oxygen injector is for noting oxygen to the flue gas of being used as Secondary Air.
On described the second outlet branch road, between flue gas heat-exchange unit and preheater, set gradually the second flue gas control valve, air draft system, primary air fan, the second flue gas control valve is used for regulating primary air flow, and air draft system is for air draught use when air burning, and primary air fan is smoke power source.
The two ends parallel connection of described gas cooler be provided with cigarette subcooling control valve gas cooler close branch road, before the gas approach of described gas cooler is provided with shut-off valve, after the exhanst gas outlet of described gas cooler is provided with shut-off valve, gas cooler cuts out the node one of branch road between described front shut-off valve and desulfurizer, and node two is between described rear shut-off valve and flue gas heat-exchange unit.During air burning operating mode, forward and backward shut-off valve cuts out, cigarette subcooling control valve is opened, and by gas cooler excision operation, during oxygen-enriched combusting operating mode, forward and backward shut-off valve is opened, and cigarette subcooling control valve is closed, and gas cooler puts into operation.
Between described preheater and pulverized coal preparation system, be provided with between the 3rd flue gas control valve, preheater and a wind oxygen injector and be provided with between the 4th flue gas control valve, preheater and the secondary air inlet of burner and be provided with the 5th flue gas control valve, by above-mentioned flue gas control valve, regulate the air quantity separately of wind for wind, Secondary Air and a powder process.
Between described flue gas heat-exchange unit and carbon dioxide compression purification devices, be provided with the 6th flue gas control valve, flue gas heat-exchange unit is connected with chimney through the 7th flue gas control valve, according to operation, unnecessary flue gas need to be done to compression purification process or discharge.
After the exhanst gas outlet of described deduster, be divided into two-way, one tunnel after Secondary Air oxygen injector enters preheater as Secondary Air, another road enters gas cooler, before desulphurization plant, extracts flue gas as Secondary Air, and circulating flue gas temperature is higher, can reach 200 ℃ of 150-, can reduce to a certain extent heat loss due to exhaust gas, due to the minimizing of exhaust gas volumn, the exhaust gas volumn of the required processing of follow-up flue gas purification system reduces simultaneously, can reduce the scale of this system largely, reduce costs; But because circulating flue gas is processed without desulfurization dewatering, water content can be up to 20%, in stove, adiabatic flame temperature reduces, and the steady combustion of burner is difficulty relatively.
After the exhanst gas outlet of described desulfurizer, be divided into two-way, a road enters gas cooler, another road after Secondary Air oxygen injector enters preheater as Secondary Air, also can consider to extract through desulfurization but the flue gas not dewatering as Secondary Air.
The after-flame wind snout arranged outside air port of described burner, pulverized coal preparation system this air port of when operation is air feed not, when pulverized coal preparation system is stopped transport with this air port air feed.
Another technical problem to be solved by this invention is to provide a kind of oxygen-enriched combustion boiler system operation method that is conducive to oxygen-enriched combustion boiler system stable operation, the circulating ratio of flue gas recycled is controlled at 60%～95%, according to related tests, during below or above this scope, conventionally be not easy to guarantee the stability of burning, control the volume content of steam in flue gas recycled below 7%, consider the rich CO that oxygen-enriched combusting forms
2flue gas, after desulfurization, dedusting, temperature can be reduced to 50～150 ℃ conventionally, if do not carry out drying and dehydrating, its moisture can be up to more than 30%, especially when burning high sulfur coal, when flue-gas temperature is reduced to dew point when following, the SO in flue gas
3, CO
2, H
2o and alkaline earth element will form extremely strong corrosive acid mist, aggravation corrosion cigarette air channel, burner hearth, heating surface etc.; In addition, during using the flue gas of high-moisture as a wind pulverized coal conveying, easily cause that airduct stops up and powder storehouse caking, affect the safe and stable operation of system, therefore, primarily control the water vapour content of flue gas recycled.
The note oxygen ratio of a wind is 15%～25%, exhaust gas volumn after note oxygen ratio=(injecting oxygen amount+former oxygen oxygen amount)/note oxygen, described " amount " is volume, note oxygen ratio regulates corresponding flue gas control valve in oxygen injector and flue gas recirculation loop to realize by combining, object be to make to note a wind after oxygen as far as possible with conventional air burning operating mode next time the partial pressure of oxygen of wind approach, guarantee the inheritability of technology, be convenient to boiler and control with reference to existing air burning technology in the designs such as heating surface layout, lectotype selection and actual motion.In addition, one time wind also doubles as defeated powder wind conventionally, and its note oxygen ratio is also unsuitable too high, to guarantee security.
The note oxygen ratio of Secondary Air is 20%～35%, and account form, control method and effect and an aforementioned wind of its note oxygen ratio regulate similar.The note oxygen ratio of Secondary Air is suitably higher than a wind, thereby is conducive to improve combustion stability and promotes after-flame.
When switching from air burning operating mode to oxygen-enriched combusting operating mode, to carry out successively " increase direct oxygen injection, increase circulating flue gas ratio and reduce total blast volume " three, be adjusted to once adjustment, by more than twice adjustment, from air burning operating mode, switch to oxygen-enriched combusting operating mode, guarantee that in handoff procedure, obvious deterioration does not occur for burning in air and gas system pressure, flow and stove, heat transfer.
The invention has the beneficial effects as follows: adopt and in oxygen-enriched combustion boiler system, arrange denitrating system and desulphurization system, avoided oxygen-enriched combusting flue gas recirculation process sulphur oxide, nitrogen oxide to occur enrichment, cause the problems such as flue gas recycled pipeline and heated surface corrosion and discharge sulfureous in flue gas oxide, nitrous oxides concentration be higher, make oxysulfide, discharged nitrous oxides concentration can be controlled in zone of reasonableness; Employing after preheater heating, do not note the dry flue gas of oxygen as the fluid media (medium) of pulverized coal preparation system, a wind after note oxygen, as coal dust pumped (conveying) medium, is effectively controlled CO in boiler exhaust gas
2more than concentration enrichment to 80%, be beneficial to after coal dust firing CO in flue gas
2trapping; Adopt wind, a Secondary Air separately to note oxygen, and will note oxygen proportion control at zone of reasonableness, Secondary Air adopts low-temperature end note oxygen, has taken into account uniformity, the security of oxygen-enriched combusting note oxygen.
Accompanying drawing explanation
Fig. 1 is the composition schematic diagram of oxygen-enriched combustion boiler system of the present invention.
Fig. 2 is that schematic diagram is selected in note oxygen of the present invention position (position of oxygen injector in pipeline).
In figure, be labeled as: burner hearth 1, burner 2, after-flame wind snout 3, economizer 4, denitrification apparatus 5, preheater 6, deduster 7, air-introduced machine 8, flue gas heat-exchange unit 9, desulfurizer 10, front shut-off valve 11, gas cooler 12, cigarette subcooling control valve 13, rear shut-off valve 14, the 6th flue gas control valve 15, carbon dioxide compression purification devices 16, the first flue gas control valve 17, the second flue gas control valve 18, air draft system 19, back-end ductwork 20, pressure fan 21, primary air fan 22, a wind oxygen injector 23, Secondary Air oxygen injector 24, Secondary Air 25, a wind 26, wind 27 for powder process, the 5th flue gas control valve 28, the 4th flue gas control valve 29, the 3rd flue gas control valve 30, pulverized coal preparation system 31, air and powder mixer 32, powder storehouse 33, dust-precipitator 34, chimney 35, the 7th flue gas control valve 36, heating surface 37, heating surface 38, heating surface 39.
The specific embodiment
Below in conjunction with drawings and Examples, the present invention is further described.
As Fig. 1, shown in Fig. 2, oxygen-enriched combustion boiler system of the present invention comprises burner hearth 1, burner 2, after-flame wind snout 3, preheater 6, back-end ductwork 20, dust-precipitator 34 and chimney 35, between the heat release gas approach of the outlet of back-end ductwork 20 and preheater 6, be connected with denitrification apparatus 5, the heat release exhanst gas outlet of preheater 6 is connected with the heat release gas approach of flue gas heat-exchange unit 9 through deduster 7, the heat release exhanst gas outlet of flue gas heat-exchange unit 9 and desulfurizer 10, after gas cooler 12 connects successively, tieback is to the heat absorption gas approach of flue gas heat-exchange unit 9, the heat absorption exhanst gas outlet of flue gas heat-exchange unit 9 separates three outlet branch roads, the first outlet branch road is connected with the secondary air inlet of burner 2 through Secondary Air oxygen injector 24 and preheater 6 successively, the second outlet branch road after preheater 6 minute two-way separately with a wind oxygen injector 23, pulverized coal preparation system 31 connects, one time wind oxygen injector 23 is connected with a wind inlet of burner 2 through air and powder mixer 32, pulverized coal preparation system 31 is connected with powder storehouse 33, powder storehouse 33 respectively with air and powder mixer 32, after-flame wind snout 3 is connected with dust-precipitator 34, the 3rd outlet branch road is connected to carbon dioxide compression purification devices 16 or chimney 35 through control valve, on the first outlet branch road and the second outlet branch road, be respectively arranged with and be positioned at preheater 6 air draft system 19 before.
Use the oxygen-enriched combusting method of above-mentioned oxygen-enriched combustion boiler system to be: by pressure fan 21 and primary air fan 22, from the clean exhanst gas outlet flue of flue gas heat-exchange unit 9, to extract 60%～90% clean flue gas altogether.Secondary Air oxygen injector 24 as the circulating flue gas of Secondary Air 25 by being arranged in pressure fan 21 outlets injects 60%～80% required oxygen of burning, and by Secondary Air oxygen injector 24, oxygen is mixed with circulating flue gas, then will after circulating flue gas heating, deliver to burner 2 through preheater 6; Through the circulating flue gas of primary air fan 22 through preheater 6 by after circulating flue gas heating, be divided into wind 26 and wind 27 for powder process, wind 26 injects 10%～40% required oxygen of burning by being arranged in a wind oxygen injector 23 on an air channel, after one time wind 26 mixes with coal dust in air and powder mixer 32, through burner 2, send into burner hearth 1 burning with Secondary Air 25.The hot flue gas that burning produces is successively by after heating surfaces 37,38,39 at different levels, denitrification apparatus 5 after being arranged in economizer 4 removes the NOx in flue gas, successively by after deduster 7, air-introduced machine 8, flue gas heat-exchange unit 9, enter double alkali method desulfurizing device 10 and remove the SO in flue gas again
2, the clean flue gas after desulfurization removes the part moisture in flue gas by gas cooler 12 again, and the moisture in clean flue gas is controlled in 5%.Through the clean flue gas of gas cooler 12 dehumidifying 60%～90% as circulating flue gas, remainder is delivered to carbon dioxide compression purification devices 16 compression purifying or is entered atmosphere by chimney 35.Deduster 7 adopts electric cleaner, and denitrification apparatus 5 adopts SCR denitrification apparatus.
Oxygen-enriched combustion boiler system of the present invention, flue gas recycled after denitrification apparatus 5 denitrations, desulfurizer 10 desulfurization removes the most of steam in flue gas through being arranged in desulfurizer 10 gas cooler 12 below, control the content of steam in flue gas recycled in 4%～7%, the circulating ratio of flue gas recycled is controlled at 70%～95%.
As shown in Figure 2, oxygen-enriched combustion boiler system of the present invention, one time wind 26, Secondary Air 25 are noted oxygen by the oxygen injector being arranged on recirculating gas duct by different proportion respectively.One time wind 26 adopts oxygen injector hot junction note oxygen, and note oxygen ratio is 15%～25%; Secondary Air 25 adopts oxygen injector cold junction note oxygen, and note oxygen ratio is 20%～35%.
As the oxygen-enriched combustion boiler system of the present invention of Fig. 1, by controlling switch and the aperture of two air draft systems 19 and the first flue gas control valve 17, the second flue gas control valve 18, can realize smoothly the switching between air burning and oxygen-enriched combusting and two kinds of combustion conditions.During air burning operating mode, the first flue gas control valve 17, the second flue gas control valve 18 are closed, and two air draft systems 19 are opened, directly exhaust is as burning and powder process wind, and front shut-off valve 11, rear shut-off valve 14 are closed, cigarette subcooling control valve 13 is opened, by cigarette cooler excision operation.During oxygen-enriched combusting operating mode, two air draft systems 19 are closed, the first flue gas control valve 17, the second flue gas control valve 18 are opened, and front shut-off valve 11, rear shut-off valve 14 are opened, and cigarette subcooling control valve 13 is closed, and gas cooler 12 puts into operation.
embodiment:
As Fig. 1, shown in Fig. 2, oxygen-enriched combustion boiler system of the present invention comprises burner hearth 1, burner 2, after-flame wind snout 3, economizer 4 is positioned at back-end ductwork 20, preheater 6, dust-precipitator 34 and chimney 35, between the heat release gas approach of the outlet of back-end ductwork 20 and preheater 6, be connected with denitrification apparatus 5, the heat release exhanst gas outlet of preheater 6 is connected with the heat release gas approach of flue gas heat-exchange unit 9 through deduster 7, the heat release exhanst gas outlet of flue gas heat-exchange unit 9 and desulfurizer 10, after gas cooler 12 connects successively, tieback is to the heat absorption gas approach of flue gas heat-exchange unit 9, the two ends parallel connection of gas cooler 12 be provided with cigarette subcooling control valve 13 gas cooler close branch road, before the gas approach of gas cooler 12 is provided with, shut-off valve 11, after the exhanst gas outlet of gas cooler 12 is provided with, shut-off valve 14, gas cooler cuts out the node one of branch road between front shut-off valve 11 and desulfurizer 10, node two is between rear shut-off valve 14 and flue gas heat-exchange unit 9, the heat absorption exhanst gas outlet of flue gas heat-exchange unit 9 separates three outlet branch roads, the first outlet branch road has the first flue gas control valve 17 successively, air draft system 19, pressure fan 21, Secondary Air oxygen injector 24, through preheater 6, be connected with the secondary air inlet of burner 2, the second outlet branch road sets gradually the second flue gas control valve 18, air draft system 19, primary air fan 22, after preheater 6, a minute two-way connects respectively the 4th flue gas control valve 29, after the 3rd flue gas control valve 30 separately with a wind oxygen injector 23, pulverized coal preparation system 31 connects, one time wind oxygen injector 23 is connected with a wind inlet of burner 2 through air and powder mixer 32, pulverized coal preparation system 31 is connected with powder storehouse 33, powder storehouse 33 respectively with air and powder mixer 32, after-flame wind snout 3 is connected with dust-precipitator 34, the 3rd outlet branch road is connected to carbon dioxide compression purification devices 16 or continues to be connected to chimney 35 through the 7th flue gas control valve 36 through the 6th flue gas control valve 15, deduster 34 is connected with chimney 35.
The air burning operating mode of above-mentioned boiler:
The first flue gas control valve 17, the second flue gas control valve 18 are in closed condition, two air draft systems 19 are opened, and directly exhaust is as burning and powder process wind wind regime, and front shut-off valve 11, rear shut-off valve 14 are closed, cigarette subcooling control valve 13 is opened, by gas cooler 12 excision operations.It is wind 27 for powder process that the mill coal drying agent of pulverized coal preparation system 31 adopts the hot blast through preheater 6, adopts cold wind to carry out temperature adjustment; Pulverized coal preparation system adopts closed system, and weary gas 271 is sent into burner hearth 1 as burner after-flame wind.Powder feeding adopts a preheater 6 hot wind 26 out, and with the temperature adjustment of bypass cold wind, air temperature of burner is chosen 150～200 ℃, and burner primary air ratio chooses 20%～30%, and primary air velocity degree is chosen 20～25m/s.
The oxygen-enriched combusting operating mode of above-mentioned boiler:
Two air draft systems 19 are in closed condition, and the first flue gas control valve 17, the second flue gas control valve 18 are opened, and front shut-off valve 11, rear shut-off valve 14 are opened, and cigarette subcooling control valve 13 is in closed condition, and gas cooler 12 moves.It is wind 27 for powder process that the mill coal drying agent of pulverized coal preparation system 31 adopts the hot blast after preheater 6 preheatings, adopts cold flue gas recycled to carry out temperature adjustment; Pulverized coal preparation system 31 adopts open system, and pulverized coal making system gas 27 causes back-end ductwork 20 and enters atmosphere by chimney 35 after dust-precipitator 34 is collected coal dust.One time wind 26 adopts high temperature note oxygen, and air temperature of burner is chosen 150-200 ℃, and burner primary air flow is definite by the pulverized coal channel speed suitable with air burning operating mode and wind muzzle velocity of burner, and one time wind note oxygen ratio is 15-20%.Burner Secondary Air adopts the hot Secondary Air after preheater 6 heating, at the front employing low temperature note of preheater 6 oxygen.Because pulverized coal preparation system 31 has adopted open system, burner after-flame wind snout 3 arranged outside air ports, pulverized coal preparation system this air port of when operation is air feed not, air feed when pulverized coal preparation system is stopped transport.
Air burning/oxygen-enriched combusting operating mode is switched:
Oxygen-enriched combustion boiler system of the present invention as shown in Figure 1, both can realize air burning, also can realize oxygen-enriched combusting, by two air draft systems 19 and the first flue gas control valve 17, the second flue gas control valve 18, can realize smoothly the switching of air burning and two kinds of combustion conditions of oxygen-enriched combusting.For air burning mode, by regulating the air door of pressure fan 21, air-introduced machine 8, be easy to realize the adjusting of air quantity and the micro-negative pressure of burner hearth; For oxygen-enriched combusting mode, except reaching aforementioned final control target, for oxygen-enriched combusting, approach the air and gas system of full closeding state, by selecting suitable air quantity, blast regulative mode, reasonably to distribute the pressure of burner hearth and smoke wind pipe, make exerting oneself of air-introduced machine in handoff procedure require excessively not increase, avoid furnace pressure to transfinite simultaneously.The change procedure of major control variable while being switched to oxygen-enriched combusting operating mode from air burning operating mode, comprises that the coordination between controlled quentity controlled variables such as entering air capacity, space division system oxygen-supplying amount and the circulating flue gas flow of burner hearth, the flue gas flow of discharging by chimney and a circulating flue gas flow is controlled.For guaranteeing that in handoff procedure, obvious deterioration does not occur for burning in air and gas system pressure, flow and stove, heat transfer, should carry out successively the operation of " increase direct oxygen injection, increase circulating flue gas ratio and reduce total blast volume ", by several, operate the operating mode that reaches stage by stage final and switch target.
Claims (14)
1. oxygen-enriched combustion boiler system, comprise burner hearth (1), burner (2), after-flame wind snout (3), preheater (6), back-end ductwork (20), dust-precipitator (34) and chimney (35), it is characterized in that: its flue gas recirculation pipeline comprises denitrification apparatus (5), desulfurizer (10) and gas cooler (12) are also followed following setting, between the heat release gas approach of the outlet of back-end ductwork (20) and preheater (6), be connected with denitrification apparatus (5), the heat release exhanst gas outlet of preheater (6) is connected with the heat release gas approach of flue gas heat-exchange unit (9) through deduster (7), the heat release exhanst gas outlet of flue gas heat-exchange unit (9) and desulfurizer (10), after gas cooler (12) connects successively, tieback is to the heat absorption gas approach of flue gas heat-exchange unit (9), a wind (26) of burner (2) is being sent into burner (2) through preheater (6) rear portion through a wind oxygen injector (23), remainder is as wind for powder process (27), the Secondary Air (25) of burner (2) enters preheater (6) and sends into burner (2) again after Secondary Air oxygen injector (24).
2. oxygen-enriched combustion boiler system as claimed in claim 1, it is characterized in that: the heat absorption exhanst gas outlet of described flue gas heat-exchange unit (9) separates three outlet branch roads, the first outlet branch road is connected with the secondary air inlet of burner (2) through Secondary Air oxygen injector (24) and preheater (6) successively, the second outlet branch road through preheater (6) after, divide two-way separately with a wind oxygen injector (23), pulverized coal preparation system (31) connects, a wind oxygen injector (23) is connected with a wind inlet of burner (2) through air and powder mixer (32), pulverized coal preparation system (31) is connected with powder storehouse (33), powder storehouse (33) respectively with air and powder mixer (32), after-flame wind snout (3) is connected with dust-precipitator (34), the 3rd outlet branch road is connected to carbon dioxide compression purification devices (16) or chimney (35) through control valve, on the first outlet branch road and the second outlet branch road, be respectively arranged with and be positioned at preheater (6) air draft system (19) before.
3. oxygen-enriched combustion boiler system as claimed in claim 2, it is characterized in that: on described the first outlet branch road, between flue gas heat-exchange unit (9) and preheater (6), set gradually the first flue gas control valve (17), air draft system (19), pressure fan (21) and Secondary Air oxygen injector (24).
4. oxygen-enriched combustion boiler system as claimed in claim 2, it is characterized in that: on described the second outlet branch road, between flue gas heat-exchange unit (9) and preheater (6), set gradually the second flue gas control valve (18), air draft system (19), primary air fan (22).
5. oxygen-enriched combustion boiler system as claimed in claim 2, it is characterized in that: the two ends parallel connection of described gas cooler (12) be provided with cigarette subcooling control valve (13) gas cooler close branch road, at the gas approach of described gas cooler (12), be provided with front shut-off valve (11), at the exhanst gas outlet of described gas cooler (12), be provided with rear shut-off valve (14), gas cooler cuts out the node one of branch road between described front shut-off valve (11) and desulfurizer (10), and node two is between described rear shut-off valve (14) and flue gas heat-exchange unit (9).
6. oxygen-enriched combustion boiler system as claimed in claim 2, is characterized in that: between described preheater (6) and pulverized coal preparation system (31), be provided with and between the secondary air inlet that is provided with the 4th flue gas control valve (29), preheater (6) and burner (2) between the 3rd flue gas control valve (30), preheater (6) and a wind oxygen injector (23), be provided with the 5th flue gas control valve (28).
7. oxygen-enriched combustion boiler system as claimed in claim 2, it is characterized in that: between described flue gas heat-exchange unit (9) and carbon dioxide compression purification devices (16), be provided with the 6th flue gas control valve (15), flue gas heat-exchange unit (9) is connected with chimney (35) through the 7th flue gas control valve (36).
8. oxygen-enriched combustion boiler system as claimed in claim 1, it is characterized in that: after the exhanst gas outlet of described deduster (7), be divided into two-way, one tunnel is as Secondary Air (25) after Secondary Air oxygen injector (24) enters preheater (6), and another road enters gas cooler (12).
9. oxygen-enriched combustion boiler system as claimed in claim 1, it is characterized in that: after the exhanst gas outlet of described desulfurizer (10), be divided into two-way, one tunnel enters gas cooler (12), another road after Secondary Air oxygen injector (24) enters preheater (6) as Secondary Air (25).
10. oxygen-enriched combustion boiler system as claimed in claim 1, is characterized in that: after-flame wind snout (3) the arranged outside air port of described burner (2).
11. as described in any one claim in claim 1～10 operation method of oxygen-enriched combustion boiler system, it is characterized in that: the circulating ratio of flue gas recycled is controlled at 60%～95%, control the volume content of steam in flue gas recycled below 7%.
12. as described in any one claim in claim 1～10 operation method of oxygen-enriched combustion boiler system, it is characterized in that: the note oxygen ratio of a wind is 15%～25%.
13. as described in any one claim in claim 1～10 operation method of oxygen-enriched combustion boiler system, it is characterized in that: the note oxygen ratio of Secondary Air is 20%～35%.
14. as described in any one claim in claim 1～10 operation method of oxygen-enriched combustion boiler system, it is characterized in that: when switching from air burning operating mode to oxygen-enriched combusting operating mode, to carry out successively " increase direct oxygen injection, increase circulating flue gas ratio and reduce total blast volume " three, be adjusted to once adjustment, by more than twice adjustment, from air burning operating mode, switch to oxygen-enriched combusting operating mode.
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