CN111637491A - Control method and device for oxygen-enriched combustion boiler system - Google Patents

Control method and device for oxygen-enriched combustion boiler system Download PDF

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Publication number
CN111637491A
CN111637491A CN202010411031.1A CN202010411031A CN111637491A CN 111637491 A CN111637491 A CN 111637491A CN 202010411031 A CN202010411031 A CN 202010411031A CN 111637491 A CN111637491 A CN 111637491A
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China
Prior art keywords
fan
boiler
matched
load
rotating speed
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CN202010411031.1A
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Chinese (zh)
Inventor
吴海波
傅培舫
陈威男
柳朝晖
廖海燕
余学海
郑楚光
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Huazhong University of Science and Technology
Shenhua Guohua Beijing Electric Power Research Institute Co Ltd
Guohua Power Branch of China Shenhua Energy Co Ltd
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Huazhong University of Science and Technology
Shenhua Guohua Beijing Electric Power Research Institute Co Ltd
Guohua Power Branch of China Shenhua Energy Co Ltd
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Priority to CN202010411031.1A priority Critical patent/CN111637491A/en
Publication of CN111637491A publication Critical patent/CN111637491A/en
Pending legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N3/00—Regulating air supply or draught
    • 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
    • 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
    • F23C2202/30—Premixing fluegas with combustion air
    • 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)
  • Regulation And Control Of Combustion (AREA)

Abstract

The invention discloses a control method of an oxygen-enriched combustion boiler system, which comprises the following steps: acquiring the current load of the boiler; taking the flue gas amount and the oxygen injection amount which are matched with the current load of the boiler as variables, and calculating by adopting a pipeline characteristic curve equation to obtain the total pressure of the fan which is matched with the current load of the boiler; calculating to obtain the fan rotating speed matched with the current load of the boiler according to the fan full pressure matched with the current load of the boiler, the fan full pressure matched with the full load of the boiler and the fan rated rotating speed; and sending a rotating speed adjusting instruction generated according to the rotating speed of the fan matched with the current load of the boiler to a fan rotating speed adjusting device. The method of the invention meets the requirement of stable combustion of the boiler system by matching the set smoke gas quantity of the fan with the set oxygen injection quantity of the oxygen injector.

Description

Control method and device for oxygen-enriched combustion boiler system
Technical Field
The invention relates to the field of energy production, in particular to a control method and a control device for an oxygen-enriched combustion boiler system.
Background
The oxygen-enriched combustion boiler system is a semi-closed circulation system, about 70 percent of flue gas is circularly returned and mixed with different amounts of oxygen to form primary air and secondary air, the primary air carries pulverized coal to enter a hearth for combustion, and CO-enriched CO is generated2The flue gas enters a tail flue and is subjected to series treatment, and about 30 percent of CO is contained in the flue gas2The separation system enters the next process flow. In order to meet the requirement of stable combustion of the oxygen-enriched combustion semi-closed circulation system under a given load, the fixed smoke amount of the fan and the given oxygen injection amount of the oxygen injector need to be matched.
The prior art method for matching the fixed smoke gas quantity of the fan with the fixed oxygen injection quantity of the oxygen injector comprises a series fan and a regulating fan valve. Although enough power can be provided after the fans are connected in series, the variable load coordination control is difficult, the system stability is poor, and the energy consumption is large. When the valve of the adjusting fan is opened to the maximum opening, the full-load operation requirement can be met, but the adjusting capability of low-load operation is poor, and the energy consumption is large.
Disclosure of Invention
The invention provides a control method and a control device of an oxygen-enriched combustion boiler system aiming at the problems in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a control method of an oxygen-enriched combustion boiler system in a first aspect, which comprises the following steps:
acquiring the current load of the boiler;
taking the flue gas amount and the oxygen injection amount which are matched with the current load of the boiler as variables, and calculating by adopting a pipeline characteristic curve equation to obtain the total pressure of the fan which is matched with the current load of the boiler;
calculating to obtain the fan rotating speed matched with the current load of the boiler according to the fan full pressure matched with the current load of the boiler, the fan full pressure matched with the full load of the boiler and the fan rated rotating speed;
and sending a rotating speed adjusting instruction generated according to the rotating speed of the fan matched with the current load of the boiler to a fan rotating speed adjusting device.
The rated rotating speed refers to the rotating speed under the rated power of the fan, and belongs to the inherent performance parameters of the fan.
Further, the current load matched fan rotating speed of the boiler is obtained by calculating according to the current load matched fan full pressure of the boiler, the full load matched fan full pressure of the boiler and the rated rotating speed of the fan, and the method specifically comprises the following steps:
taking the flue gas amount and the oxygen injection amount which are matched with the full load of the boiler as variables, and calculating by adopting a pipeline characteristic curve equation to obtain the full pressure of the fan which is matched with the full load of the boiler;
according to the formula
Figure BDA0002492347270000021
Calculating to obtain the rotating speed of the fan matched with the current load of the boiler,
wherein n represents the fan rotating speed matched with the current load of the boiler;
nforehead (forehead)Representing the rated rotating speed of the fan;
p represents the full pressure of a fan matched with the current load of the boiler;
Pis full ofIndicating the full pressure of the fan matched with the full load of the boiler. .
Further, the pipeline characteristic curve equation is as follows:
Figure BDA0002492347270000031
wherein the content of the first and second substances,
p represents the full pressure of the fan matched with the load of the boiler;
R1the pipeline wind resistance from the relative pressure zero point of the inlet side of the fan to the inlet of the fan is shown;
R2the pipeline wind resistance from the outlet of the fan to the relative pressure zero point of the outlet side of the fan is represented;
Qoxygen gasRepresenting the matched oxygen injection amount of the boiler load;
Qcigarette with heating meansIndicating the amount of flue gas matched to the boiler load.
The relative pressure zero point of the inlet side of the fan comprises a boiler hearth smoke outlet, and the relative pressure zero point of the outlet side of the fan comprises a boiler hearth smoke inlet or a boiler burner smoke inlet. The pipeline wind resistance can be obtained by an experimental determination method recorded in the prior art. For example, in an experimental measurement method, the following formula can be used to calculate the pipeline windage:
Figure BDA0002492347270000032
wherein the content of the first and second substances,
r represents the wind resistance of the pipeline;
h represents the total pressure difference of two ends of the pipeline, and the invention comprises the total pressure difference between the relative pressure zero point of the inlet side of the fan and the inlet of the fan in the measuring pipeline and the total pressure difference between the relative pressure zero point of the outlet of the fan and the outlet side of the fan;
q represents the air volume in the measurement line.
Further, the method comprises: and sending an oxygen injection amount adjusting instruction generated according to the oxygen injection amount to an oxygen amount adjusting device.
Further, the method comprises the step of sending an adjusting instruction to a fan valve adjusting device after sending a rotating speed adjusting instruction generated according to the rotating speed of the fan to the fan rotating speed adjusting device.
In the invention, after the rotating speed of the fan is adjusted, resistance adjustment is performed by properly assisting the adjustment of the fan valve, so that the instability generated by frequency conversion fine adjustment of the rotating speed of the fan can be reduced.
Further, taking the flue gas volume and the oxygen injection volume which are matched with the current load of the boiler as variables, and calculating by adopting a pipeline characteristic curve equation to obtain the full pressure of the fan which is matched with the current load of the boiler, the method specifically comprises the following steps:
and under the condition that the current load of the boiler is determined to be changed relative to the load of the boiler at the previous moment, the flue gas volume and the oxygen injection volume which are matched with the current load of the boiler are used as variables, and the total pressure of the fan which is matched with the current load of the boiler is obtained by adopting a pipeline characteristic curve equation.
A second aspect of the present invention provides a control device for an oxyfuel combustion boiler system, comprising:
the storage module is used for storing the flue gas amount and the oxygen injection amount which are matched with the load of the boiler;
the receiving module is used for acquiring the current load of the boiler;
the calculation module is used for calculating to obtain the full pressure of a fan matched with the current load of the boiler by using a pipeline characteristic curve equation and calculating to obtain the rotating speed of the fan matched with the current load of the boiler according to the full pressure of the fan matched with the current load of the boiler, the full pressure of the fan matched with the full load of the boiler and the rated rotating speed of the fan;
and the sending module is used for sending a rotating speed adjusting instruction generated according to the rotating speed of the fan matched with the current load of the boiler to the rotating speed adjusting device of the fan.
The control device specifically includes, but is not limited to, a DCS system, a PLC system, and other terminals or servers running software.
The third aspect of the invention provides a fan applied to an oxygen-enriched combustion boiler system, wherein the performance parameters of the fan meet the following requirements: pMaximum of≥PIs full ofWherein, in the step (A),
Pmaximum ofRepresenting the upper limit of the full pressure of the fan;
Pis full ofExpressing the full pressure of the fan matched with the full load of the boiler, taking the flue gas amount and the oxygen injection amount matched with the full load of the boiler as variables, and calculating by adopting a pipeline characteristic curve equation to obtain PIs full of；
The pipeline characteristic curve equation is as follows:
Figure BDA0002492347270000051
wherein the content of the first and second substances,
p represents the full pressure of the fan matched with the load of the boiler;
R1the pipeline wind resistance from the relative pressure zero point of the inlet side of the fan to the inlet of the fan is shown;
R2the pipeline wind resistance from the outlet of the fan to the relative pressure zero point of the outlet side of the fan is represented;
Qoxygen gasRepresenting the matched oxygen injection amount of the boiler load;
Qcigarette with heating meansIndicating the amount of flue gas matched to the boiler load.
Further, when the fan applied to the oxygen-enriched combustion boiler system runs at a low load, the total pressure of the fan is calculated by adopting the pipeline characteristic curve equation according to the smoke gas amount and the oxygen injection amount matched with the boiler load, and then the lowest rotating speed of the fan is determined according to the total pressure and the smoke gas amount of the fan.
The invention provides an oxygen-enriched combustion boiler system, which comprises a boiler furnace, a fan, an oxygen injection device, a fan rotating speed adjusting device, an oxygen quantity adjusting device and the control device, wherein the boiler furnace, the fan and the oxygen injection device are sequentially connected through a pipeline, the oxygen injection device is arranged at the outlet position of the fan, and the control device is respectively in communication connection with the fan rotating speed adjusting device and the oxygen quantity adjusting device.
The communication connection is a connection mode, and communication is formed between connected devices through transmission interaction of signals. The communication connection includes a wired connection and a wireless connection.
Further, the oxygen injection device is arranged close to the boiler furnace, and the distance between the oxygen injection device and the boiler furnace is larger than the shortest distance required by mixing of the flue gas and the oxygen in the pipeline. The oxygen quantity adjusting device is in communication connection with the oxygen injection device, and adjusts the oxygen injection device according to the received oxygen injection quantity adjusting instruction.
Further, the fan comprises the fan applied to the oxygen-enriched combustion boiler system.
Further, the fan includes a primary fan and a secondary fan.
Further, the fan rotating speed adjusting device comprises a frequency converter, a gearbox and a multi-speed motor, and preferably the frequency converter. The fan rotating speed adjusting device is in communication connection with the fan. The fan rotating speed adjusting device receives a rotating speed adjusting instruction which is sent by the control device and generated according to the fan rotating speed n matched with the current load of the boiler, and the fan rotating speed adjusting device outputs the power supply voltage frequency to the fan
Figure BDA0002492347270000061
The rotating speed of the fan is changed. Wherein f isForehead (forehead)Indicating the rated frequency, n, of the fanForehead (forehead)Indicating the rated speed of the fan.
Compared with the prior art, the invention has the following beneficial effects:
(1) the fixed smoke quantity of the fan is matched with the fixed oxygen injection quantity of the oxygen injector to meet the requirement of stable combustion of the boiler system. When the boiler is operated under variable load, the rotating speed of the fan is adjusted based on the amount of flue gas and the amount of oxygen injection which are matched with the load of the boiler, the requirement of the variable load operation of a boiler system is met, the backflow of gas at the outlet of the fan and the surge working condition of the fan are effectively prevented, and the service life of the system is prolonged. The continuous operation and the equipment safety of the oxygen-enriched combustion system can be effectively ensured, the cost is saved, and the economic benefit is increased.
(2) Compared with the prior art in which a fan is connected in series and a fan valve is adjusted, the method provided by the invention has the advantages that the rotating speed of the fan is adjusted based on the flue gas volume and the oxygen injection volume which are matched with the load of the boiler, the opening degree of the fan valve can be kept unchanged when the boiler system operates at low load, the required flue gas volume is obtained by adjusting the rotating speed of the fan, and the power consumption of the fan is obviously reduced.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a flowchart of a specific implementation of a control method according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a control device according to an embodiment of the present invention.
FIG. 3 is a schematic structural diagram of an oxycombustion boiler system according to an embodiment of the present invention.
The reference numerals in figure 3:
1-boiler furnace; 2-a blower; 3-oxygen injector; 4-a frequency converter; 5-a burner; 6-a control device; 7-blower valve; 8-fan valve regulating device; 9-an oxygen regulating device; 10-flue gas purification device.
The solid lines in fig. 3 represent system piping connections and the dashed lines represent communication connections.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
As shown in FIG. 1, the present invention provides a specific example of a control method for an oxycombustion boiler system, comprising:
101. acquiring the current load of the boiler;
the boiler load is given by operator manual input or by the grid dispatch center.
102. Taking the flue gas amount and the oxygen injection amount which are matched with the current load of the boiler as variables, calculating by adopting a pipeline characteristic curve equation to obtain the full pressure of a fan which is matched with the current load of the boiler, and calculating according to the full pressure of the fan which is matched with the current load of the boiler, the full pressure of the fan which is matched with the full load of the boiler and the rated rotating speed of the fan to obtain the rotating speed of the fan which is matched with the current load of the boiler;
103. and sending a rotating speed adjusting instruction generated according to the rotating speed of the fan matched with the current load of the boiler to a fan rotating speed adjusting device.
As shown in fig. 2, a specific example of the control device of the oxycombustion boiler system according to the present invention includes:
the storage module 201 is used for storing the flue gas amount and the oxygen injection amount which are matched with the boiler load;
the specific embodiment of the storage module comprises a database, wherein the boiler load, the smoke gas amount and the oxygen injection amount which are matched with the boiler load are stored in the database in a data table mode.
A receiving module 202, configured to obtain a current load of a boiler;
the calculation module 203 is used for calculating to obtain the full pressure of the fan matched with the current load of the boiler by using a pipeline characteristic curve equation and calculating to obtain the rotating speed of the fan matched with the current load of the boiler according to the full pressure of the fan matched with the current load of the boiler, the full pressure of the fan matched with the full load of the boiler and the rated rotating speed of the fan;
and the sending module 204 is configured to send a rotation speed adjustment instruction generated according to the fan rotation speed matched with the current load of the boiler to the fan rotation speed adjustment device.
Fig. 3 shows a schematic structural diagram of an oxygen-enriched combustion boiler system, which comprises a boiler furnace 1, a blower 2, an oxygen injector 3, a frequency converter 4, a burner 5, a control device 6, a blower valve 7, a blower valve adjusting device 8, an oxygen amount adjusting device 9 and a flue gas purifying device 10. The smoke outlet of the boiler hearth 1 is connected with the inlet of the blower 2, the outlet of the blower 2 is connected with the inlet of the oxygen injection device 3, the oxygen injection device 3 is arranged close to the boiler hearth 1, and the outlet of the oxygen injection device 3 is connected with the inlet of the combustor 5. The control device 6 is respectively connected with the oxygen quantity adjusting device 9, the fan valve adjusting device 8 and the frequency converter 4 in a communication way.
When the boiler system operates under variable load, the control device 6 receives a current boiler load signal, searches the flue gas volume and the oxygen injection volume matched with the current load of the boiler from a database of the control device 6, takes the flue gas volume and the oxygen injection volume matched with the current load of the boiler as variables, calculates by adopting a pipeline characteristic curve equation to obtain the total pressure of a fan matched with the current load of the boiler, and calculates according to the total pressure of the fan matched with the current load of the boiler, the total pressure of the fan matched with the full load of the boiler and the rated rotating speed of the fan to obtain the rotating speed of the fan matched with the current load of the boiler. And sending a rotating speed adjusting instruction generated according to the rotating speed of the fan matched with the current load of the boiler to the frequency converter 4, wherein the frequency converter 4 changes the rotating speed of the fan 2 by adjusting the power supply voltage frequency of the fan 2.
The control device 6 sends an oxygen injection amount adjustment command generated according to the oxygen injection amount to the oxygen amount adjustment device 9, and the oxygen amount adjustment device 9 adjusts the oxygen injection amount of the oxygen injector 3.
It should be noted that, unless expressly stated or limited otherwise, the terms "communicate" and "connect" are to be construed broadly, e.g., as meaning a fixed connection, a removable connection, or an integral connection; may be a mechanical connection; the communication may be direct, indirect via an intermediate medium, or internal to both elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the above-described drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It will be appreciated that the data so used may be interchanged under appropriate circumstances such that the embodiments described herein may be practiced otherwise than as specifically illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
It should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing and simplifying the present invention, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (10)

1. A control method of an oxygen-enriched combustion boiler system is characterized by comprising the following steps:
acquiring the current load of the boiler;
taking the flue gas amount and the oxygen injection amount which are matched with the current load of the boiler as variables, and calculating by adopting a pipeline characteristic curve equation to obtain the total pressure of the fan which is matched with the current load of the boiler;
calculating to obtain the fan rotating speed matched with the current load of the boiler according to the fan full pressure matched with the current load of the boiler, the fan full pressure matched with the full load of the boiler and the fan rated rotating speed;
and sending a rotating speed adjusting instruction generated according to the rotating speed of the fan matched with the current load of the boiler to a fan rotating speed adjusting device.
2. The method according to claim 1, wherein the fan rotating speed matched with the current load of the boiler is obtained by calculating according to the fan full pressure matched with the current load of the boiler, the fan full pressure matched with the full load of the boiler and the fan rated rotating speed, and specifically comprises:
taking the flue gas amount and the oxygen injection amount which are matched with the full load of the boiler as variables, and calculating by adopting a pipeline characteristic curve equation to obtain the full pressure of the fan which is matched with the full load of the boiler;
according to the formula
Figure FDA0002492347260000011
Calculating to obtain the rotating speed of the fan matched with the current load of the boiler,
wherein n represents the fan rotating speed matched with the current load of the boiler;
nforehead (forehead)Representing the rated rotating speed of the fan;
p represents the full pressure of a fan matched with the current load of the boiler;
Pis full ofIndicating the full pressure of the fan matched with the full load of the boiler.
3. The method according to claim 1 or 2, wherein the pipeline characteristic curve equation is:
Figure FDA0002492347260000012
wherein the content of the first and second substances,
p represents the full pressure of the fan matched with the load of the boiler;
R1the pipeline wind resistance from the relative pressure zero point of the inlet side of the fan to the inlet of the fan is shown;
R2the pipeline wind resistance from the outlet of the fan to the relative pressure zero point of the outlet side of the fan is represented;
Qoxygen gasRepresenting the matched oxygen injection amount of the boiler load;
Qcigarette with heating meansIndicating the amount of flue gas matched to the boiler load.
4. The method according to any one of claims 1-3, further comprising: and sending an oxygen injection amount adjusting instruction generated according to the oxygen injection amount to an oxygen amount adjusting device.
5. The method of any one of claims 1-4, further comprising sending a fan valve adjustment command to a fan speed adjustment device after sending a speed adjustment command generated based on the fan speed to the fan speed adjustment device.
6. The method according to any one of claims 1 to 5, wherein the method for calculating the full pressure of the fan with the matched current load of the boiler by using the flue gas amount and the oxygen injection amount with the matched current load of the boiler as variables and adopting a pipeline characteristic curve equation comprises the following steps:
and under the condition that the current load of the boiler is determined to be changed relative to the load of the boiler at the previous moment, the flue gas volume and the oxygen injection volume which are matched with the current load of the boiler are used as variables, and the total pressure of the fan which is matched with the current load of the boiler is obtained by adopting a pipeline characteristic curve equation.
7. A control apparatus of an oxyfuel combustion boiler system, comprising:
the storage module is used for storing the flue gas amount and the oxygen injection amount which are matched with the load of the boiler;
the receiving module is used for acquiring the current load of the boiler;
the calculation module is used for calculating to obtain the full pressure of a fan matched with the current load of the boiler by using a pipeline characteristic curve equation and calculating to obtain the rotating speed of the fan matched with the current load of the boiler according to the full pressure of the fan matched with the current load of the boiler, the full pressure of the fan matched with the full load of the boiler and the rated rotating speed of the fan;
and the sending module is used for sending a rotating speed adjusting instruction generated according to the rotating speed of the fan matched with the current load of the boiler to the rotating speed adjusting device of the fan.
8. The utility model provides a fan for oxygen boosting burning boiler system which characterized in that, the performance parameter of fan satisfies: pMaximum of≥PIs full ofWherein, in the step (A),
Pmaximum ofRepresenting the upper limit of the full pressure of the fan;
Pis full ofExpressing the full pressure of the fan matched with the full load of the boiler, taking the flue gas amount and the oxygen injection amount matched with the full load of the boiler as variables, and calculating by adopting a pipeline characteristic curve equation to obtain PIs full of；
The pipeline characteristic curve equation is as follows:
Figure FDA0002492347260000031
wherein the content of the first and second substances,
p represents the full pressure of the fan matched with the load of the boiler;
R1the pipeline wind resistance from the relative pressure zero point of the inlet side of the fan to the inlet of the fan is shown;
R2the pipeline wind resistance from the outlet of the fan to the relative pressure zero point of the outlet side of the fan is represented;
Qoxygen gasRepresenting the matched oxygen injection amount of the boiler load;
Qcigarette with heating meansIndicating the amount of flue gas matched to the boiler load.
9. An oxygen-enriched combustion boiler system is characterized by comprising a boiler furnace, a fan, an oxygen injection device, a fan rotating speed adjusting device, an oxygen amount adjusting device and a control device according to claim 7, wherein the boiler furnace, the fan and the oxygen injection device are sequentially connected through a pipeline, the oxygen injection device is arranged at the outlet position of the fan, and the control device according to claim 7 is respectively in communication connection with the fan rotating speed adjusting device and the oxygen amount adjusting device.
10. An oxycombustion boiler system according to claim 9, characterized in that the oxygen injection means is located close to the boiler furnace, the distance between the oxygen injection means and the boiler furnace being larger than the shortest distance required for mixing of flue gas and oxygen in the piping.
CN202010411031.1A 2020-05-14 2020-05-14 Control method and device for oxygen-enriched combustion boiler system Pending CN111637491A (en)

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CN102679331A (en) * 2012-03-28 2012-09-19 太原理工大学 Control method of primary air fan of circulating fluidized bed boiler
CN103017196A (en) * 2012-12-13 2013-04-03 深圳市特种设备安全检验研究院 Air distribution optimized automatic control system and control method thereof of boiler

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