CN101251263A - Power boiler low NOx combustion method and control system based on wind powder closed-loop control - Google Patents
Power boiler low NOx combustion method and control system based on wind powder closed-loop control Download PDFInfo
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- CN101251263A CN101251263A CNA2007101734801A CN200710173480A CN101251263A CN 101251263 A CN101251263 A CN 101251263A CN A2007101734801 A CNA2007101734801 A CN A2007101734801A CN 200710173480 A CN200710173480 A CN 200710173480A CN 101251263 A CN101251263 A CN 101251263A
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Abstract
The present invention discloses a power station boiler low NOx combustion method based on wind powder closed loop control and a boiler primary air wind powder closed loop control system. The method is as follows: the main burner region excessive air coefficient is controlled below 1.0; the deficient air at the upper side of a hearth is supplemented by an SOFA nozzle at AA interval; a function f(Q)=f(N,D) is used to compare NOx actual measured value with target value, wherein N is coal type, D is load and Q is graded air amount; after adjusted by PID, the deviation of the comparison is used as a correcting factor to be overlapped with the coal type-load-graded air amount function f(Q) for adjusting the mixture ratio between the SOFA air amount and the secondary air amount of the combustion region. The system comprises a first signal measuring part, a signal acquiring part, a data processing part and a feedback part. With the closed loop control system, the method ensures, in different working conditions, the even distribution of the first air wind powder of each layer and perfect mixture ratio between the SOFA air amount and the secondary air amount of the combustion region, so that the method realizes the optimized control target of reducing the discharging of boiler contamination NOx and improving boiler efficiency.
Description
Technical field
The present invention relates to a kind of power boiler low NOx combustion method and control system, relate to a kind of low NOx combustion method and a wind wind of relevant boiler powder closed-loop control system based on the closed-loop control of wind powder of arranging the boiler of tangential firing mode in particular at the single burner hearth that adopts PM (Pollution Minimum) main burner with the low NOx classification wind combustion system of MACT (Mitsubishi Advanced Combustion Technology) type, ∏ type based on the closed-loop control of wind powder.
Background technology
The primary energy of China is based on coal, and the coal fired power generation installed capacity accounts for about 70% of total installation of generating capacity.5,200,000 tons of 4,690,000 tons, 2005 2650000 tons, 2000 nineteen ninety-fives of coal fired power plant NOx discharge capacity.Expect 2010 and will reach 5,500,000 tons.If by the present emission behaviour in coal-burning power plant, if do not take effectively to control the effective technology of NOx discharging, later 5-1O in 2010, the NOx total emission volumn will surpass S02, becomes the first sour gas pollutant effulent of power industry.There is strict standard in more external developed countries to the NOx discharging of coal fired power plant, are 200mg/m as Germany
3, Japan is 410mg/m
3China's past is relatively more loose to the NOx discharge standard of coal fired power plant, is 650mg/m
3, and do not execute, so the NOx concentration of emission of existing coal fired power plant is than higher, generally at 700mg/m
3About, the OFA low-NOx combustor is equipped with in part power plant, but the NOx concentration of emission is still at 600mg/m
3About, compare with external advanced level and to still have bigger gap.The new newly-designed station boiler NOx of national Specification concentration of emission is 450mg/m at present
3, strict emission control standards has been put into effect to the coal fired power plant of active service in ground such as Beijing and Tianjin, and Shanghai City also is about to put into effect the action plan that strict provincial standard is carried out the coal-fired power station boiler pollutant control.The low NOx combusting technology of the different coals of adaptation that exploitation is advanced is of great practical significance to China.
The evolution of low NOx combusting technology can be divided into the three generations: first generation technology is not done big change to combustion system, just the method for operation of burner is adjusted or improves; Second generation low NOx combustion
The evolution of low NOx combusting technology can be divided into the three generations: first generation technology is not done big change to combustion system, just the method for operation of burner is adjusted or improves; The feature of second generation low NOx combusting technology is that burner is sent in the combustion air classification, reduces the ignition zone oxygen concentration of (also claiming once district), the corresponding flame peak temperature that reduced; Third generation technology then is to implement three grades of combustion systems (or burner) of air, fuel staging in burner hearth simultaneously.The 1000MW ultra-supercritical boiler has adopted third generation low NOx combusting technology exactly, on this basis in order to bring into play the effect that whole fractional combustion generates reduction NOx in this type PM type burner and the MACT type stove better, must handle the proportioning of interior whole fractional combustion burner region secondary wind of a wind wind of boiler corner tangential firing powder distributed uniform and stove and the interval SOFA air quantity of AA well, help to realize this goal by low NOx combusting technology based on the closed-loop control of wind powder.
Summary of the invention
First technical problem to be solved by this invention provides a kind of PM (Pollution Minimum) main burner and low NOx classification wind combustion system of MACT (Mitsubishi Advanced CombustionTechnology) type that station boiler is adopted and carries out improved power boiler low NOx combustion method based on the closed-loop control of wind powder, the present invention can reduce the discharging of power boiler burning pollutant NOx, and improves boiler efficiency.Second technical problem to be solved by this invention provides an a kind of wind wind of boiler powder closed-loop control system that designs according to the power boiler low NOx combustion method of above-mentioned wind powder closed-loop control.
The technical solution used in the present invention: a kind of power boiler low NOx combustion method based on the closed-loop control of wind powder, at single burner hearth, the ∏ type is arranged, combustion system is the low NOx classification wind combustion system of PM main burner and MACT type, the boiler of tangential firing mode, it is as follows to optimize step: main burner zone excess air coefficient is controlled at below 1.0, air in the upper furnace deficiency is replenished by the interval SOFA spout of AA place, generally be controlled to be 0.2～0.3 of theoretical air quantity, use coal N-load D-classification wind air quantity Q function f (Q)=f (N, D), under the certain coal situation of burning, with NOx measured value and desired value relatively, its deviation is regulated the back by PID and is added to as modifying factor and regulates combustion zone secondary air flow and SOFA air flow rate proportioning on coal-load-classification wind air quantity function f (Q).
A wind wind of a kind of boiler powder closed-loop control system, comprise signal measurement one time, signals collecting, data are handled with 4 parts of feedback execution and are formed, its signal measurement measuring point comprises the coal powder density measuring point, wind-warm syndrome degree measuring point and primary air velocity dynamic pressure measuring point, its temperature signal collection primary element adopts armoured thermocouple, outer tube is good with thermal conduction characteristic, wear-resisting powder metallurgy spraying plating, the primary element of gathering differential pressure signal adopts the anti-blocking wearing-resistant measuring cell, its pressure sensing hole is arranged and is demarcated with wind tunnel experiment, transmitter adopts the high accuracy differential pressure transmitter, coal powder density is measured and is adopted the coal dust measuring transducer to deliver to data collecting system through preposition modular converter, data are handled and the master system configuration adopts configuration instrument to realize, the feedback actuator is carried out signal according to feedback each wind automatic and adjustable shrinkage cavity and the rotary pulverized coal distributor of each coal pulverizer are regulated.
Beneficial effect of the present invention: the present invention guarantees that by closed-loop control system boiler a wind wind of each layer powder distributed uniform and combustion zone secondary air flow and SOFA air flow rate proportioning the best under different operating modes have realized to lower boiler pollutant NOx discharging and to improve the optimal control target of boiler efficiency.
Description of drawings
Fig. 1 PM main burner of the present invention structural representation;
Fig. 2 hangs down NOx classification wind combustion system schematic diagram;
Fig. 3 sets of burners and oppositely two tangential firing mode schematic diagram;
A wind wind of Fig. 4 boiler powder closed-loop control system schematic diagram;
Fig. 5 typical case classification wind control mode schematic diagram.
The specific embodiment
Below by drawings and Examples the present invention is described in further detail: the 1000MW ultra-supercritical boiler adopts MIT's technology, single burner hearth, ∏ type are arranged, combustion system is PM (PollutionMinimum) main burner, as shown in Figure 1, and the low NOx classification wind combustion system of MACT (Mitsubishi Advanced CombustionTechnology) type, as shown in Figure 2, oppositely two tangential firing modes, as shown in Figure 3.The centrifugal action that this PM type burner utilizes elbow before each coal nozzle is divided into up and down deep or light two strands of air-flows to fuel air to form vertical bias combustion, make burner concentrated phase side form local anoxycausis, reach the fractional combustion in the same burner, adopt whole grading combustion technology in the MACT type stove in addition, make the overall reducing atmosphere that forms in burner in the stove zone, suppress a large amount of generations of NOx, having enough spaces between OFA and AA makes a part of NOx of generation be reduced into N2, last AA burner (SOFA) plays the after-flame wind action further is provided, and reaches stable, the combustion efficiency of low NOx.In order to bring into play the effect that whole fractional combustion generates reduction NOx in above-mentioned PM type burner and the MACT type stove better, must handle the proportioning of interior whole fractional combustion burner region secondary wind of a wind wind of boiler corner tangential firing powder distributed uniform and stove and the interval SOFA air quantity of AA well, here we propose the low NOx combusting technology based on the closed-loop control of wind powder for this reason, its basic ideas are: discharging and boiler efficiency η with boiler pollutant NOx are the optimal control target, guarantee boiler a wind wind of each layer powder distributed uniform and combustion zone secondary air flow and SOFA air flow rate proportioning the best under different operating modes by closed-loop control system.
A kind of power boiler low NOx combustion method based on the closed-loop control of wind powder, at single burner hearth, the ∏ type is arranged, combustion system is the low NOx classification wind combustion system of PM main burner and MACT type, the 1000MW ultra-supercritical boiler of oppositely two tangential firing modes, it is as follows to optimize step, as shown in Figure 5, under certain unit load and burning coal situation, NOx amount and boiler thermal output and desired value by actual measurement compare, then by coal N-load D-classification wind air quantity Q function f (Q)=f (N, D) the chemical equivalent proportioning that calculates is controlled, control signal is delivered to corresponding executing agency controls SOFA baffle opening position, reach the purpose of optimizing proportioning.Generally main burner zone excess air coefficient being controlled at below 1.0 (changes according to result of the test definite with coal), the selection of this zone air quantity also will take into account the economy (being boiler thermal output) of burning and prevent the generation of wall-cooling surface high temperature corrosion except guaranteeing maximum NOx emission reduction effect.In upper furnace, not enough air replenishes (be generally theoretical air quantity about 0.2～0.3) by the interval SOFA spout of AA place, thereby makes the furnace outlet excess air coefficient reach designing requirement.(N, D), this function can be determined by the result of NOx The Emission Optimization adjustment test to use coal N-load D-classification wind air quantity Q function f (Q)=f here.Under the certain coal situation of burning, NOx measured value and desired value (determining according to optimizing test) are compared, its deviation is regulated the back by PID and is added on coal-load-classification wind air quantity function f (Q) as modifying factor, regulates combustion zone secondary air flow and SOFA air flow rate proportioning.
A wind wind of a kind of boiler powder closed-loop control system, comprise signal measurement, signals collecting, a data processing and feed back 4 part compositions of execution, as shown in Figure 4, the measurement of concetration signal is delivered to remote I/O, differential pressure measurement signal by the signal conversion module and is delivered to the signal that remote I/O, temperature sensor come out again by pressure guiding pipe to differential pressure transmitter and directly enter remote I/O, and the signal that last remote I/O comes out enters upper industrial computer and DCS.Its system's measuring point comprises coal powder density measuring point, wind-warm syndrome degree measuring point, primary air velocity dynamic pressure measuring point, and feedback is carried out the adjusting that comprises each wind automatic and adjustable shrinkage cavity and the rotary pulverized coal distributor of each coal pulverizer.Here the temperature signal collection primary element adopts armoured thermocouple, and outer tube is with good, the wear-resisting powder metallurgy spraying plating of thermal conduction characteristic.The primary element of gathering differential pressure signal adopts the anti-blocking wearing-resistant measuring cell, and its pressure sensing hole arranges to connect according to wind tunnel experimental results and demarcate that transmitter adopts high-precision differential pressure transmitter.Coal powder density is measured and is adopted special coal dust measuring transducer to deliver to data collecting system through preposition modular converter.Data are handled and the master system configuration adopts configuration instrument to realize.The feedback actuator is carried out signal according to feedback and is carried out.By said process, the discharging of the NOx of this boiler is by original 560mg/m
3Drop to 350mg/m
3, boiler efficiency has risen 0.3%.
Above said content only is the basic explanation of the present invention under conceiving, and according to any equivalent transformation that technical scheme of the present invention is done, all should belong to protection scope of the present invention.
Claims (2)
1. power boiler low NOx combustion method based on the closed-loop control of wind powder, at single burner hearth, the ∏ type is arranged the boiler of tangential firing mode, it is as follows to optimize step: main burner zone excess air coefficient is controlled at below 1.0, air in the upper furnace deficiency is replenished by the interval SOFA spout of AA place, be controlled to be 0.2～0.3 of theoretical air quantity, use coal N-load D-classification wind air quantity Q function f (Q)=f (N, D), under the certain coal situation of burning, with NOx measured value and desired value relatively, its deviation is regulated the back by PID and is added to as modifying factor and regulates combustion zone secondary air flow and SOFA air flow rate proportioning on coal-load-classification wind air quantity function f (Q).
2. a wind wind of boiler powder closed-loop control system, comprise signal measurement one time, signals collecting, data are handled with 4 parts of feedback execution and are formed, its signal measurement measuring point comprises the coal powder density measuring point, wind-warm syndrome degree measuring point and primary air velocity dynamic pressure measuring point, its temperature signal collection primary element adopts armoured thermocouple, outer tube is good with thermal conduction characteristic, wear-resisting powder metallurgy spraying plating, the primary element of gathering differential pressure signal adopts the anti-blocking wearing-resistant measuring cell, its pressure sensing hole is arranged and is demarcated with wind tunnel experiment, transmitter adopts the high accuracy differential pressure transmitter, coal powder density is measured and is adopted the coal dust measuring transducer to deliver to data collecting system through preposition modular converter, data are handled and the master system configuration adopts configuration instrument to realize, the feedback actuator is carried out signal according to feedback each wind automatic and adjustable shrinkage cavity and the rotary pulverized coal distributor of each coal pulverizer are regulated.
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| CN103267303A (en) * | 2013-05-15 | 2013-08-28 | 大唐林州热电有限责任公司 | NOx generation reducing method for four-corner tangential boiler of thermal power plant |
| CN103822225A (en) * | 2013-12-31 | 2014-05-28 | 深圳市国创新能源研究院 | Integrated low-nitrogen combustion system and control method |
| CN104061588A (en) * | 2014-07-17 | 2014-09-24 | 烟台龙源电力技术股份有限公司 | Low-nitrogen combustion control method and system based on secondary air door air regulation control |
| CN104676638A (en) * | 2015-01-14 | 2015-06-03 | 冉启发 | Method of controlling low-nitrogen combustion damper in load-down process of boiler |
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| CN106895435A (en) * | 2017-02-06 | 2017-06-27 | 中国国电集团公司谏壁发电厂 | A kind of advanced denitration operation method of 1000MW ultra supercriticals tower-type furnace |
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| CN103267303A (en) * | 2013-05-15 | 2013-08-28 | 大唐林州热电有限责任公司 | NOx generation reducing method for four-corner tangential boiler of thermal power plant |
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| CN103822225A (en) * | 2013-12-31 | 2014-05-28 | 深圳市国创新能源研究院 | Integrated low-nitrogen combustion system and control method |
| CN103822225B (en) * | 2013-12-31 | 2016-04-27 | 深圳市国创新能源研究院 | Integrated low nitrogen burning system and control method |
| CN104061588A (en) * | 2014-07-17 | 2014-09-24 | 烟台龙源电力技术股份有限公司 | Low-nitrogen combustion control method and system based on secondary air door air regulation control |
| CN104676638A (en) * | 2015-01-14 | 2015-06-03 | 冉启发 | Method of controlling low-nitrogen combustion damper in load-down process of boiler |
| CN104676638B (en) * | 2015-01-14 | 2017-07-04 | 冉启发 | A kind of low nitrogen burning control method for air door during boiler load down |
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| CN104692129B (en) * | 2015-03-17 | 2015-11-25 | 吴联凯 | The control method of Pneumatic conveyer |
| CN105509035A (en) * | 2016-02-02 | 2016-04-20 | 华北电力科学研究院有限责任公司 | Method and device for determining opposite firing air supply quantity and automatic control system |
| CN105509035B (en) * | 2016-02-02 | 2018-11-20 | 华北电力科学研究院有限责任公司 | A kind of method, apparatus and automatic control system of determining opposed firing intake |
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| CN112228869A (en) * | 2020-10-20 | 2021-01-15 | 安徽皖维高新材料股份有限公司 | Combustion adjusting method for inhibiting NOx production during low-load operation of pulverized coal boiler |
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