CN105509036A - Pulverized coal boiler pure-oxygen combustion system with no nitrogen or carbon dioxide emission - Google Patents
Pulverized coal boiler pure-oxygen combustion system with no nitrogen or carbon dioxide emission Download PDFInfo
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- CN105509036A CN105509036A CN201610072999.XA CN201610072999A CN105509036A CN 105509036 A CN105509036 A CN 105509036A CN 201610072999 A CN201610072999 A CN 201610072999A CN 105509036 A CN105509036 A CN 105509036A
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- boiler
- flue gas
- flue
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C9/00—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber
- F23C9/003—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber for pulverulent fuel
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C7/00—Combustion apparatus characterised by arrangements for air supply
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K3/00—Feeding or distributing of lump or pulverulent fuel to combustion apparatus
- F23K3/02—Pneumatic feeding arrangements, i.e. by air blast
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L7/00—Supplying non-combustible liquids or gases, other than air, to the fire, e.g. oxygen, steam
- F23L7/007—Supplying oxygen or oxygen-enriched air
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C2202/00—Fluegas recirculation
- F23C2202/20—Premixing fluegas with fuel
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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
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
Abstract
The invention provides a pulverized coal boiler pure-oxygen combustion system with no nitrogen or carbon dioxide emission, and aims to solve the problem of environmental pollution caused during application of a pulverized coal boiler and take the effects of saving energy and reducing carbon emission. The pulverized coal boiler pure-oxygen combustion system comprises a boiler, a reduction furnace, a first flue gas pipeline, a second flue gas pipeline, a primary oxygen pipeline, a secondary oxygen pipeline and a self-control device, wherein the boiler is equipped with a pure oxygen combustor on which a fuel spray lance and a secondary oxygen lance are mounted, and the fuel spray lance is connected with a pulverized coal conveying pipeline; the reduction furnace is connected with the boiler by the first flue gas pipeline; the first flue gas pipeline is equipped with a flue gas storage tank and a first flue gas valve group; the second flue gas pipeline is connected onto the flue gas storage tank and equipped with a second flue gas valve group, and a laying-off device is connected between the second flue gas pipeline and the pulverized coal conveying pipeline; the primary oxygen pipeline is connected onto the pulverized coal conveying pipeline and equipped with a primary oxygen valve station; the secondary oxygen pipeline is connected to the secondary oxygen lance and equipped with a secondary oxygen valve station; the self-control device comprises a PLC upper computer, and the boiler, the laying-off device, the second flue gas valve group, the primary oxygen valve station and the secondary oxygen valve station are all connected with the PLC upper computer.
Description
Technical field
The present invention relates to coal combustion technology field, especially relate to the burning of a kind of pulverized coal boiler pure oxygen without the system of nitrogen without CO2 emission.
Background technology
Pulverized coal combustion and its corresponding system, relatively wider in the range of application of China, the core apparatus of pulverized coal combustion is burning boiler.In prior art, dusty fuel many employings compressed air required in burning boiler is carried, and dusty fuel and air be mixed combining combustion in boiler.
There is following defect as the method for conveying gas in above-mentioned employing compressed air: first, in air, the ratio of nitrogen accounts for 78%, and dusty fuel and air be mixed combining combustion in boiler, the extreme temperatures in boiler, when being greater than 1200 DEG C, nitrogen in air and oxygen react, and produce multiple nitrogen oxide, the existence of nitrogen oxide, this kind of method is made to be discontented with sufficient environmental protection standard and requirement, and the great amount of carbon dioxide gas purging that burning produces, causes the appearance of greenhouse effects; Secondly, after nitrogen is heated, the flue gas produced with boiler combustion is together discharged, and in air, the content of nitrogen is higher, and the heat energy that the nitrogen be discharged has is higher, a large amount of heat energy loss, causes the energy loss of entire system serious; Again, except oxygen, containing other multiple gases in air, and the proportion of other multiple gases is higher, and in boiler, pulverized-fuel combustion desired gas is oxygen, and air-breathing mode is difficult to make dusty fuel Thorough combustion, causes the serious waste of energy source raw material.
Summary of the invention
A kind of pulverized coal boiler pure oxygen is the object of the present invention is to provide to burn without the system of nitrogen without CO2 emission, the effect to solve pulverized-coal fired boiler problem to environment in application process, reaching energy-conservation simultaneously, reduce discharging.
For achieving the above object, the embodiment of the present invention by the following technical solutions:
Pulverized coal boiler pure oxygen burning, without the system of nitrogen without CO2 emission, comprising:
Boiler, it is equiped with pure oxygen combustor, described pure oxygen combustor is provided with Fuel lance, secondary oxygen rifle, described Fuel lance is connected with power transportation pipe;
Carbon dioxide reduction stove, is connected by the first flue with described boiler;
Described first flue, it is equiped with flue gas storage tank, the first smoke valve group, and described flue gas storage tank is near described boiler, and described first smoke valve group is near described reduction furnace;
Second flue, is connected on described flue gas storage tank, it is equiped with the second smoke valve group, is connected with blanking device between described second flue and described power transportation pipe;
An oxygen pipeline, its port of export is connected on described power transportation pipe, it is equiped with an oxygen valve station;
Secondary oxygen pipeline, its port of export is connected on described secondary oxygen rifle, it is equiped with secondary oxygen valve station;
Self-con-tained unit, comprise PLC host computer, described boiler, described blanking device, described second smoke valve group, a described oxygen valve station, described secondary oxygen valve station are connected with described PLC host computer respectively, during use, by boiler, described blanking device, described second smoke valve group, a described oxygen valve station, described secondary oxygen valve station described in described PLC PC control.
As the further improvement of technique scheme, described blanking device comprises: the powder material tank connected successively from top to bottom, double helix weighing device, hyperbola injector mixer, and described second flue is connected by described hyperbola injector mixer with described power transportation pipe; And establish, described boiler is equiped with the second thermocouple, described double helix weighing device, described second thermocouple are all connected with described PLC host computer.
As the further improvement of technique scheme, a described oxygen valve station comprises: be installed on a described oxygen pipeline, from stop valve, the first Pressure gauge, pressure maintaining valve, the first pressure transmitter, the first thermocouple, first-class gauge, the first control valve, the first stop valve, the second pressure transmitter that its arrival end to the port of export is arranged in order, described first-class gauge, the first control valve are all connected with described PLC host computer.
As the further improvement of technique scheme, described secondary oxygen valve station comprises: be installed on described secondary oxygen pipeline, from second gauge, the second control valve, the second stop valve and the 3rd pressure transmitter that its arrival end to the port of export is arranged in order, described second gauge, the second control valve are all connected with described PLC host computer; And establish, the arrival end of described secondary oxygen pipeline is connected on the described oxygen pipeline between described first thermocouple and described first-class gauge, and the port of export of a described oxygen pipeline is connected on the described power transportation pipe of described Fuel lance.
As the further improvement of technique scheme, on described first flue, be equiped with the first high pressure positive blower, flue gas processing device, described flue gas storage tank, the second high pressure positive blower successively from described boiler to described reduction furnace.
Further, described first smoke valve group comprises: be installed on described first flue, from the first butterfly valve, the second Pressure gauge and the 3rd flowmeter that described boiler to described reduction furnace is arranged in order, wherein, described first butterfly valve is between described flue gas storage tank and described second high pressure positive blower, and described second Pressure gauge and described 3rd flowmeter are between described second high pressure positive blower and described reduction furnace.
As the further improvement of technique scheme, described second smoke valve group comprises: be installed on described second flue, from the second butterfly valve, the 3rd Pressure gauge, the 4th flowmeter and the 3rd control valve that described flue gas storage tank to described hyperbola injector mixer is arranged in order, described 4th flowmeter, the 3rd control valve are all connected with described PLC host computer.
Further, described second flue is also equiped with third high pressure fan, described third high pressure fan is between described second butterfly valve and described 3rd Pressure gauge.
As the further improvement of technique scheme, described Fuel lance and described secondary oxygen rifle are parallel to each other, and described Fuel lance is positioned at the top of described secondary oxygen rifle.
As the further improvement of technique scheme, during use, the pressure limit arranging described third high pressure fan is 30-100KPa.
As the further improvement of technique scheme, during use, the exhaust gas volumn arranged in described second flue accounts for the 10%-70% of total exhaust gas volumn, and in described boiler, the ratio of amount of oxygen and coal dust amount is between 1-1.5, and
In described boiler, an oxygen amount accounts for the 10%-30% of total amount of oxygen, and secondary oxygen amount accounts for the 70%-90% of total amount of oxygen.
As the further improvement of technique scheme, the top of described reduction furnace is connected with reduction carbon feed arrangement, the sidewall of described reduction furnace offers oxygen input port, carbon monoxide delivery outlet, and the flue gas input port to be connected with described first flue, described oxygen input port is positioned at the top of described flue gas input port, during use, in described reduction furnace, the volume ratio of oxygen content and flue gas content is between 0.25-0.5.
Pulverized coal boiler pure oxygen burning provided by the invention is without the system of nitrogen without CO2 emission, because this system includes the first flue and the second flue, the flue gas (main component is carbon dioxide) that boiler combustion produces arrives flue gas storage tank, part of smoke in flue gas storage tank enters the second flue, blanking device is connected with between second flue and power transportation pipe, ingeniously utilize flue gas pulverized coal conveying raw material, flue gas is recycled; Another part flue gas in flue gas storage tank, carbon dioxide reduction stove is entered through the first flue, in carbon dioxide reduction stove, carbon dioxide is reduced to carbon monoxide, highly purified Carbon monoxide reduction gas serves many purposes, can be used as other boiler oil, also can be used for fuel gas generation, also can be used as industrial chemicals and use.
In prior art, adopt compressed air as the conveying gas of dusty fuel, because in air, the ratio of nitrogen accounts for 78%, dusty fuel and air be mixed combining combustion in boiler, when being greater than 1200 DEG C, nitrogen in air and oxygen react, and produce multiple nitrogen oxide, the existence of nitrogen oxide, this kind of method is made to be discontented with sufficient environmental protection standard and requirement, or the great amount of carbon dioxide gas purging that burning produces, causes the appearance of greenhouse effects; ; Secondly, after nitrogen is heated, the flue gas produced with boiler combustion is together discharged, and in air, the content of nitrogen is higher, and the heat energy that the nitrogen be discharged has is higher, a large amount of heat energy loss, causes the energy loss of entire system serious; Again, except oxygen, containing other multiple gases in air, and the proportion of other multiple gases is higher, and in boiler, pulverized-fuel combustion desired gas is oxygen, and air-breathing mode is difficult to make dusty fuel Thorough combustion, causes the serious waste of energy source raw material.Compared to prior art, pulverized coal boiler pure oxygen burning provided by the invention is without the system of nitrogen without CO2 emission, on the one hand, the flue gas produced in abundant recycling boiler, the conveying gas of this flue gas as dusty fuel is recycled, replace the method utilizing compressed air as conveying gas, namely the series of problems that the high-load nitrogen in compressed air brings is avoided, such as generation nitrogen oxide causes and cannot meet environmental protection standard and requirement, the heat losses that high-load nitrogen has causes system energy loss serious, or cause that pulverized-fuel combustion is insufficient causes the series of problems such as the serious waste of energy source raw material, on the other hand, carbon dioxide reduction stove is set, the partial CO 2 product in flue gas is reduced, be reduced to and serve many purposes and the CO gas of greenhouse effects can not be caused, on the basis of the above, PLC host computer is utilized automatically to regulate pressure and the flow of flue gas, and the pressure of oxygen and flow, double helix weighing device is utilized to carry out automatic Weighing to dusty fuel, the ratio optimization of flue gas, oxygen and dusty fuel is arranged in pairs or groups, under guarantee reaches the prerequisite of environmental standard and requirement, realize the object of farthest saving the energy and raw material.
Accompanying drawing explanation
In order to be illustrated more clearly in the specific embodiment of the invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in detailed description of the invention or description of the prior art below, apparently, accompanying drawing in the following describes is some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
The pulverized coal boiler pure oxygen that Fig. 1 provides for the embodiment of the present invention burns without the schematic diagram of nitrogen without the system of CO2 emission.
Reference numeral:
1-boiler, 11-pure oxygen combustor, 11a-Fuel lance, 11b-bis-oxygen rifles;
2-reduction furnace, 21-oxygen input port, 22-carbon monoxide delivery outlet;
3-oxygen pipeline, 31-stop valve, 32-first Pressure gauge, 33-pressure maintaining valve, 34-first pressure transmitter, 35-first thermocouple, the first-class gauge of 36-, 37-first control valve, 38-first stop valve, 39-second pressure transmitter;
4-bis-oxygen pipelines, 41-second gauge, 42-second control valve, 43-second stop valve, 44-the 3rd pressure transmitter;
5-first flue, 51-first high pressure positive blower, 52-flue gas processing device, 53-flue gas storage tank, 54-first butterfly valve, 55-second high pressure positive blower, 56-second Pressure gauge, 57-the 3rd flowmeter;
6-second flue, 61-second butterfly valve, 62-third high pressure fan, 63-the 3rd Pressure gauge, 64-the 4th flowmeter, 65-the 3rd control valve;
7-blanking device, 71-powder material tank, 72-double helix weighing device, 73-hyperbola injector mixer;
8-power transportation pipe.
Detailed description of the invention
Be clearly and completely described technical scheme of the present invention below in conjunction with accompanying drawing, obviously, described embodiment is the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
In describing the invention, it should be noted that, orientation or the position relationship of the instruction such as term " " center ", " on ", D score, "left", "right", " vertically ", " level ", " interior ", " outward " they be based on orientation shown in the drawings or position relationship; be only the present invention for convenience of description and simplified characterization; instead of instruction or imply the device of indication or element must have specific orientation, with specific azimuth configuration and operation, therefore can not be interpreted as limitation of the present invention.In addition, term " first ", " second ", " the 3rd " only for describing object, and can not be interpreted as instruction or hint relative importance.
The pulverized coal boiler pure oxygen that Fig. 1 provides for the embodiment of the present invention burns without the schematic diagram of nitrogen without the system of CO2 emission, refers to Fig. 1, and the pulverized coal boiler pure oxygen burning that the embodiment of the present invention provides, without the system of nitrogen without CO2 emission, comprising:
Boiler 1, it is equiped with pure oxygen combustor 11, described pure oxygen combustor 11 is provided with Fuel lance 11a, secondary oxygen rifle 11b, described Fuel lance 11a is connected with power transportation pipe 8;
Carbon dioxide reduction stove 2, is connected by the first flue 5 with described boiler 1;
Described first flue 5, it is equiped with flue gas storage tank 53, first smoke valve group, and described flue gas storage tank 53 is near described boiler 1, and described first smoke valve group is near described reduction furnace 2;
Second flue 6, is connected on described flue gas storage tank 53, it is equiped with the second smoke valve group, is connected with blanking device 7 between described second flue 6 and described power transportation pipe 8;
An oxygen pipeline 3, its port of export is connected on described power transportation pipe 8, it is equiped with an oxygen valve station;
Secondary oxygen pipeline 4, its port of export is connected on described secondary oxygen rifle 11b, it is equiped with secondary oxygen valve station;
Self-con-tained unit, comprise PLC host computer, described boiler 1, described blanking device 7, described second smoke valve group, a described oxygen valve station, described secondary oxygen valve station are connected with described PLC host computer respectively, during use, by boiler 1, described blanking device 7, described second smoke valve group, a described oxygen valve station, described secondary oxygen valve station described in described PLC PC control.
Pulverized coal boiler pure oxygen burning provided by the invention is without the system of nitrogen without CO2 emission, because this system includes the first flue and the second flue, the flue gas (main component is carbon dioxide) that boiler combustion produces arrives flue gas storage tank, another part flue gas in flue gas storage tank enters the second flue, blanking device is connected with between second flue and power transportation pipe, ingeniously utilize flue gas pulverized coal conveying raw material, flue gas is recycled; Another part flue gas in flue gas storage tank, carbon dioxide reduction stove is entered through the first flue, in carbon dioxide reduction stove, carbon dioxide is reduced to carbon monoxide, highly purified Carbon monoxide reduction gas serves many purposes, can be used as other boiler oil, also can be used for fuel gas generation, also can be used as industrial chemicals and use.
In prior art, adopt compressed air as the conveying gas of dusty fuel, because in air, the ratio of nitrogen accounts for 78%, dusty fuel and air be mixed combining combustion in boiler, when being greater than 1200 DEG C, nitrogen in air and oxygen react, and produce multiple nitrogen oxide, the existence of nitrogen oxide, this kind of method is made to be discontented with sufficient environmental protection standard and requirement, or the great amount of carbon dioxide gas purging that burning produces, causes the appearance of greenhouse effects; ; Secondly, after nitrogen is heated, the flue gas produced with boiler combustion is together discharged, and in air, the content of nitrogen is higher, and the heat energy that the nitrogen be discharged has is higher, a large amount of heat energy loss, causes the energy loss of entire system serious; Again, except oxygen, containing other multiple gases in air, and the proportion of other multiple gases is higher, and in boiler, pulverized-fuel combustion desired gas is oxygen, and air-breathing mode is difficult to make dusty fuel Thorough combustion, causes the serious waste of energy source raw material.
Compared to prior art, pulverized coal boiler pure oxygen burning provided by the invention is without the system of nitrogen without CO2 emission, on the one hand, the flue gas produced in abundant recycling boiler, the conveying gas of this flue gas as dusty fuel is recycled, replace the method utilizing compressed air as conveying gas, namely the series of problems that the high-load nitrogen in compressed air brings is avoided, such as generation nitrogen oxide causes and cannot meet environmental protection standard and requirement, the heat losses that high-load nitrogen has causes system energy loss serious, or cause that pulverized-fuel combustion is insufficient causes the series of problems such as the serious waste of energy source raw material, on the other hand, carbon dioxide reduction stove is set, the partial CO 2 product in flue gas is reduced, be reduced to and serve many purposes and the CO gas of greenhouse effects can not be caused, on the basis of the above, PLC host computer is utilized automatically to regulate pressure and the flow of flue gas, and the pressure of oxygen and flow, double helix weighing device is utilized to carry out automatic Weighing to dusty fuel, the ratio optimization of flue gas, oxygen and dusty fuel is arranged in pairs or groups, under guarantee reaches the prerequisite of environmental standard and requirement, realize the object of farthest saving the energy and raw material.
It should be noted that, above-mentioned pure oxygen combustor is also provided with burning torch, high-energy igniter, flame detector, and three is all arranged near Fuel lance.
Be described in detail for the further improvement project of system provided by the present invention and running thereof below.
Particularly, please continue to refer to Fig. 1, described blanking device 7 comprises: the powder material tank 71 connected successively from top to bottom, double helix weighing device 72, hyperbola injector mixer 73, and described second flue 6 is connected by described hyperbola injector mixer 73 with described power transportation pipe 8; And establish, described boiler 1 is also equiped with the second thermocouple, and described double helix weighing device 72, described second thermocouple are all connected with described PLC host computer.Wherein, above-mentioned hyperbola injector mixer is provided with upper port, horizontal left port, horizontal ports having, double helix weighing device is connected with the upper port of hyperbola injector mixer, second flue is connected with the horizontal left port of hyperbola injector mixer, and power transportation pipe is connected with the horizontal right output port of hyperbola injector mixer.During use, from hyperbola injector mixer upper port dusty fuel and the high pressure flue gas from the horizontal left port of hyperbola injector mixer, two phase flow is formed in the horizontal right output port of hyperbola injector mixer, this two phase flow is mixed into boiler with an oxygen in power transportation pipe, in boiler, one time oxygen fully contacts with fuel, after the success of igniter automatic ignition, dusty fuel conflagration, ensures the flame stabilization of boiler root.
Please continue to refer to Fig. 1, as the further improvement of technique scheme, a described oxygen valve station comprises: be installed on a described oxygen pipeline 3, from stop valve 31, first Pressure gauge 32, pressure maintaining valve 33, first pressure transmitter 34, first thermocouple 35, first-class gauge 36, first control valve 37, first stop valve 38, second pressure transmitter 39 that its arrival end to the port of export is arranged in order, described first-class gauge 36, first control valve 37 is all connected with described PLC host computer.So, the temperature signal that PLC host computer can feed back according to the second thermocouple, controls an oxygen valve station, to regulate the quantity delivered of an oxygen.
Please continue to refer to Fig. 1, as the further improvement of technique scheme, described secondary oxygen valve station comprises: be installed on described secondary oxygen pipeline 4, second gauge 41, second control valve 42, second stop valve 43 be arranged in order from its arrival end to the port of export and the 3rd pressure transmitter 44, described second gauge 41, second control valve 42 is all connected with described PLC host computer; So, the temperature signal that PLC host computer can feed back according to the second thermocouple, controls secondary oxygen valve station, to regulate the quantity delivered of secondary oxygen.On the basis of above-mentioned improvement project, and establish, the arrival end of described secondary oxygen pipeline is connected on the described oxygen pipeline between described first thermocouple and described first-class gauge, and the port of export of a described oxygen pipeline 3 is connected on the described power transportation pipe 8 of described Fuel lance 11a.
Please continue to refer to Fig. 1, as the further improvement of technique scheme, on described first flue 5, be equiped with the first high pressure positive blower 51, flue gas processing device 52, described flue gas storage tank 53, second high pressure positive blower 55 successively from described boiler 1 to described reduction furnace 2.
Please continue to refer to Fig. 1, further, described first smoke valve group comprises: be installed on described first flue 5, the first butterfly valve 54, second Pressure gauge 56 be arranged in order from described boiler 1 to described reduction furnace 2 and the 3rd flowmeter 57, wherein, described first butterfly valve 54 is between described flue gas storage tank 53 and described second high pressure positive blower 55, and described second Pressure gauge 56 and described 3rd flowmeter 57 are between described second high pressure positive blower 55 and described reduction furnace 2.
Please continue to refer to Fig. 1, as the further improvement of technique scheme, described second smoke valve group comprises: be installed on described second flue 6, from the second butterfly valve 61, the 3rd Pressure gauge 63, the 4th flowmeter 64 and the 3rd control valve 65 that described flue gas storage tank 53 to described hyperbola injector mixer 73 is arranged in order, described 4th flowmeter 64, the 3rd control valve 65 are all connected with described PLC host computer.So, the temperature signal that PLC host computer can feed back according to the second thermocouple, and the ratio data of the second original flue gas conveying capacity and dusty fuel amount, the second flue gas conveying capacity and dusty fuel quantity delivered are readjusted, to meet now boiler combustion demand.
Please continue to refer to Fig. 1, further, described second flue 6 is also equiped with third high pressure fan 62, described third high pressure fan 62 is between described second butterfly valve 61 and described 3rd Pressure gauge 63, to form high pressure flue gas in the first flue, be beneficial to coal dust conveying.
Based on above improvement project, PLC host computer in the embodiment of the present invention in use, by controlling boiler, oxygen valve station, secondary oxygen valve station, the second smoke valve group, a blanking device etc., oxygen pipeline, secondary oxygen pipeline, the conducting of the second flue and cut-off can be controlled, and control above-mentioned air in pipeline changes in flow rate, meanwhile, the unlatching of blanking device, closedown and weighing process can be controlled, the unlatching of boiler, closedown and ignition process can be controlled.
Particularly, during use, the temperature signal that PLC host computer can feed back according to the second thermocouple, and the ratio data of the second original flue gas conveying capacity and dusty fuel amount, supplied flue gases amount and dusty fuel quantity delivered are readjusted, meanwhile, the temperature signal that PLC host computer can feed back according to the second thermocouple, and the ratio data of an oxygen supply amount and secondary oxygen supply amount, an oxygen supply amount and secondary oxygen supply amount are readjusted; Meanwhile, the temperature signal that PLC host computer can feed back according to the second thermocouple, and original total amount of oxygen and fuel aggregate supply ratio data, readjust total oxygen quantity delivered; Simultaneously, the temperature signal that PLC host computer can feed back according to the second thermocouple, and second exhaust gas volumn and total air inflow ratio data, the quantity delivered of the first flue gas is readjusted, to meet the demand of now boiler combustion, in flue gas storage tank storage tank, remaining flue gas is all entered in reduction furnace by the first flue.
As the further improvement of technique scheme, described Fuel lance and described secondary oxygen rifle are parallel to each other, and described Fuel lance is positioned at the top of described secondary oxygen rifle, so that secondary oxygen sprays rapid blending around flue gas from secondary oxygen rifle high speed, oxygen concentration is diluted, and the oxygen continuation after dilution and coal dust step by step blending burn, and expand the flame coverage rate in boiler, homogeneous temperature in boiler is distributed, prevents local temperature too high.
In the whole flow process of above-mentioned pulverized-coal fired boiler polyoxy combustion product gases recirculating system, PLC host computer is according to the real-time actual demand of boiler combustion, fuel feed in boiler, flue gas quantity delivered and oxygen quantity delivered are regulated in real time, to meet its requirement, in the embodiment of the present invention, arranging its requirement is: during use, the pressure limit of described third high pressure fan is 30-100KPa; Exhaust gas volumn in described second flue accounts for the 10%-70% of total exhaust gas volumn, in described boiler, the ratio of amount of oxygen and coal dust amount is between 1-1.5, and, in described boiler, an oxygen amount accounts for the 10%-30% of total amount of oxygen, and secondary oxygen amount accounts for the 70%-90% of total amount of oxygen.
As the further improvement of technique scheme, the top of described reduction furnace 2 is connected with reduction carbon feed arrangement, the sidewall of described reduction furnace offers oxygen input port 21, carbon monoxide delivery outlet 22, and the flue gas input port to be connected with described first flue, described oxygen input port 21 is positioned at the top of described flue gas input port, during use, in described reduction furnace, the volume ratio of oxygen content and flue gas content is between 0.25-0.5, to make farthest to be reduced from the carbon dioxide in the flue gas of flue gas storage tank, realize the object of carbon dioxide zero discharge.
Particularly, the pulverized coal boiler pure oxygen burning that the embodiment of the present invention provides operationally comprises following three phases without nitrogen without the system of CO2 emission:
Open heater stage: check automatic control system, an oxygen pipeline and installing valve station thereon, secondary oxygen pipeline and installing valve station thereon whether normal, check pure oxygen combustor and on Fuel lance, secondary oxygen rifle, burning torch, high-energy igniter, whether flame detector is normal, check the first flue and installing all parts thereon and valve station, second flue and installing all parts thereon and valve station, and whether reduction furnace is normal, check blanking device, whether power transportation pipe is normal, all carry out complete and under determining normal situation at above-mentioned audit program, start to open furnace igniting, an oxygen pipeline is opened by self-con-tained unit, make its conducting, in boiler, an oxygen is carried by an oxygen pipeline, and igniter fuel is provided in boiler, igniter fuel can be natural gas, also can be fuel oil, high-energy igniter automatic ignition, make igniter fuel and an oxygen mix combining combustion, formed at boiler bottom and stabilize the flame, open secondary oxygen pipeline by self-con-tained unit, PLC host computer, according to parameter informations such as the quantity delivered of igniter fuel and default furnace temperature, regulates the flow of an oxygen and secondary oxygen automatically, the first flue is opened by self-con-tained unit, second flue, the flue gas input port of blanking device and carbon dioxide reduction stove and oxygen input port, , after coal dust firing is stable, stop the supply of igniter fuel, on the interface of the PLC host computer of self-con-tained unit, be provided with total amount of fuel and amount of oxygen ratio input module, an oxygen and secondary oxygen ratio input module and carbon dioxide reduction inner flue gas of the stove amount and amount of oxygen ratio input module, operating personnel input the proportional numerical value of required input on the interface of PLC host computer, PLC host computer carries out corresponding PID arithmetic according to inputted proportional numerical value, control the ratio that on-the-spot corresponding control valve adjusts total amount of fuel and total amount of oxygen automatically, the ratio of an oxygen and secondary oxygen flow, the ratio of the first flue gas flow and the second flue gas flow, and the ratio of exhaust gas volumn and amount of oxygen in carbon dioxide reduction stove, compare regulating the value of feedback of ratio value and the flowmeter obtained, to reach best proportionate relationship.
The flue gas recirculation stage: in this stage, the exhaust gas volumn entered in the second flue accounts for the 10%-70% of total exhaust gas volumn, flue gas wherein can be pressurized to 30-100kPa by the third high pressure fan on it, when high pressure flue gas is by hyperbola injector mixer, high-speed gas jet drives coal dust to produce uniform two phase flow, and dusty fuel is delivered to pure oxygen combustor, this two phase flow is through power transportation pipe, meet with an oxygen and mix, mixture enters pure oxygen combustor by Fuel lance, coal dust and an oxygen mixed combustion, and stabilizes the flame in boiler bottom formation, secondary oxygen sprays rapid blending around flue gas from secondary oxygen rifle high speed, oxygen concentration is diluted, and the oxygen continuation after dilution and coal dust step by step blending burn, and expand the flame coverage rate in boiler, homogeneous temperature in boiler is distributed, prevents local temperature too high, PLC host computer fires according to the oxygen of amount of oxygen total in boiler and coal dust the uninterrupted that ratio size controls coal dust and total amount of oxygen, and according to an oxygen and default Ratio control oxygen of secondary oxygen and the uninterrupted of secondary oxygen, wherein, above-mentioned oxygen combustion is than setting according to coal dust amount, in the embodiment of the present invention, as most preferred scheme, oxygen and pulverized coal flow ratio setpoint are set between 1-1.5, putting before this, preferably, set the 10%-30% that oxygen amount accounts for total oxygen demand, secondary oxygen amount accounts for the 70%-90% of total oxygen demand, particularly, on the interface of the PLC host computer of self-con-tained unit, be provided with total amount of fuel and amount of oxygen ratio input module, an oxygen and secondary oxygen ratio input module and carbon dioxide reduction inner flue gas of the stove amount and amount of oxygen ratio input module, operating personnel input the proportional numerical value of required input on the interface of PLC host computer, PLC host computer carries out corresponding PID arithmetic according to inputted proportional numerical value, control the ratio that on-the-spot corresponding control valve adjusts total amount of fuel and total amount of oxygen automatically, the ratio of an oxygen and secondary oxygen flow, the ratio of the first flue gas flow and the second flue gas flow, and the ratio of exhaust gas volumn and amount of oxygen in carbon dioxide reduction stove, compare regulating the value of feedback of ratio value and the flowmeter obtained, to reach best proportionate relationship.
Flue gas reduction phase: the flue gas entering the first flue in flue gas storage tank, be admitted in carbon dioxide reduction stove with carbon generation reduction reaction, produce reducing gas, i.e. CO gas, flue gas evenly passes into the middle part of carbon dioxide reduction stove along ring-type, oxygen is passed into reduction furnace by the oxygen input port on reduction furnace sidewall, carbon raw material is provided by being positioned at reduction carbon device above reduction furnace for reduction furnace, the volume ratio of the oxygen content in reduction furnace and flue gas content is between 0.25-0.5, the Carbon monoxide reduction gas produced is exported by carbon monoxide and discharges, this Carbon monoxide reduction gas concentration is greater than 95%, it should be noted that, carbon monoxide outlet is arranged on the lower sidewall of reduction furnace, and with oxygen input port, the position of flue gas input port is relative, highly purified Carbon monoxide reduction gas serves many purposes, can be used as other boiler oil, also can be used for fuel gas generation, also can be used as industrial chemicals to use.
In describing the invention, it should be noted that, unless otherwise clearly defined and limited, term " installation ", " being connected ", " connection " should be interpreted broadly, and such as, can be fixedly connected with, also can be removably connect, or connect integratedly; Can be mechanical connection, also can be electrical connection; Can be directly be connected, also indirectly can be connected by intermediary, can be the connection of two element internals.For the ordinary skill in the art, concrete condition above-mentioned term concrete meaning in the present invention can be understood.
Last it is noted that above each embodiment is only in order to illustrate technical scheme of the present invention, be not intended to limit; Although with reference to foregoing embodiments to invention has been detailed description, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein some or all of technical characteristic; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the scope of various embodiments of the present invention technical scheme.
Claims (10)
1. pulverized coal boiler pure oxygen burning is without the system of nitrogen without CO2 emission, it is characterized in that, comprising:
Boiler, it is equiped with pure oxygen combustor, described pure oxygen combustor is provided with Fuel lance, secondary oxygen rifle, described Fuel lance is connected with power transportation pipe;
Carbon dioxide reduction stove, is connected by the first flue with described boiler;
Described first flue, it is equiped with flue gas storage tank, the first smoke valve group, and described flue gas storage tank is near described boiler, and described first smoke valve group is near described reduction furnace;
Second flue, is connected on described flue gas storage tank, it is equiped with the second smoke valve group, is connected with blanking device between described second flue and described power transportation pipe;
An oxygen pipeline, its port of export is connected on described power transportation pipe, it is equiped with an oxygen valve station;
Secondary oxygen pipeline, its port of export is connected on described secondary oxygen rifle, it is equiped with secondary oxygen valve station;
Self-con-tained unit, comprise PLC host computer, described boiler, described blanking device, described second smoke valve group, a described oxygen valve station, described secondary oxygen valve station are connected with described PLC host computer respectively, during use, by boiler, described blanking device, described second smoke valve group, a described oxygen valve station, described secondary oxygen valve station described in described PLC PC control.
2. pulverized coal boiler pure oxygen burning according to claim 1 is without the system of nitrogen without CO2 emission, it is characterized in that,
Described blanking device comprises: the powder material tank connected successively from top to bottom, double helix weighing device, hyperbola injector mixer, and described second flue is connected by described hyperbola injector mixer with described power transportation pipe;
Described boiler is equiped with the second thermocouple, described double helix weighing device, described second thermocouple are all connected with described PLC host computer.
3. pulverized coal boiler pure oxygen burning according to claim 2 is without the system of nitrogen without CO2 emission, it is characterized in that,
A described oxygen valve station comprises: be installed on a described oxygen pipeline, from stop valve, the first Pressure gauge, pressure maintaining valve, the first pressure transmitter, the first thermocouple, first-class gauge, the first control valve, the first stop valve, the second pressure transmitter that its arrival end to the port of export is arranged in order, described first-class gauge, the first control valve are all connected with described PLC host computer.
4. pulverized coal boiler pure oxygen burning according to claim 3 is without the system of nitrogen without CO2 emission, it is characterized in that,
Described secondary oxygen valve station comprises: be installed on described secondary oxygen pipeline, from second gauge, the second control valve, the second stop valve and the 3rd pressure transmitter that its arrival end to the port of export is arranged in order, described second gauge, the second control valve are all connected with described PLC host computer;
The arrival end of described secondary oxygen pipeline is connected on the described oxygen pipeline between described first thermocouple and described first-class gauge, and the port of export of a described oxygen pipeline is connected on the described power transportation pipe of described Fuel lance.
5. pulverized coal boiler pure oxygen burning according to claim 4 is without the system of nitrogen without CO2 emission, it is characterized in that,
On described first flue, be equiped with the first high pressure positive blower, flue gas processing device, described flue gas storage tank, the second high pressure positive blower successively from described boiler to described reduction furnace;
Described first smoke valve group comprises: be installed on described first flue, from the first butterfly valve, the second Pressure gauge and the 3rd flowmeter that described boiler to described reduction furnace is arranged in order, wherein,
Described first butterfly valve is between described flue gas storage tank and described second high pressure positive blower, and described second Pressure gauge and described 3rd flowmeter are between described second high pressure positive blower and described reduction furnace.
6. pulverized coal boiler pure oxygen burning according to claim 5 is without the system of nitrogen without CO2 emission, it is characterized in that,
Described second smoke valve group comprises: be installed on described second flue, from the second butterfly valve, the 3rd Pressure gauge, the 4th flowmeter and the 3rd control valve that described flue gas storage tank to described hyperbola injector mixer is arranged in order, described 4th flowmeter, the 3rd control valve are all connected with described PLC host computer;
Described second flue is also equiped with third high pressure fan, and described third high pressure fan is between described second butterfly valve and described 3rd Pressure gauge.
7. pulverized coal boiler pure oxygen burning according to claim 6 is without the system of nitrogen without CO2 emission, it is characterized in that,
Described Fuel lance and described secondary oxygen rifle are parallel to each other, and described Fuel lance is positioned at the top of described secondary oxygen rifle.
8. pulverized coal boiler pure oxygen burning according to claim 7 is without the system of nitrogen without CO2 emission, it is characterized in that,
During use, the pressure limit of described third high pressure fan is 30-100KPa.
9. pulverized coal boiler pure oxygen burning according to claim 8 is without the system of nitrogen without CO2 emission, it is characterized in that,
During use, the exhaust gas volumn in described second flue accounts for the 10%-70% of total exhaust gas volumn, and in described boiler, the ratio of amount of oxygen and coal dust amount is between 1-1.5, and,
In described boiler, an oxygen amount accounts for the 10%-30% of total amount of oxygen, and secondary oxygen amount accounts for the 70%-90% of total amount of oxygen.
10. pulverized coal boiler pure oxygen burning according to claim 9 is without the system of nitrogen without CO2 emission, it is characterized in that,
The top of described reduction furnace is connected with reduction carbon feed arrangement, the sidewall of described reduction furnace offers oxygen input port, carbon monoxide delivery outlet, and the flue gas input port to be connected with described first flue, described oxygen input port is positioned at the top of described flue gas input port, during use, in described reduction furnace, the volume ratio of oxygen content and flue gas content is between 0.25-0.5.
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