CN103216845A - Deep peak regulation method for thermal power generator set - Google Patents
Deep peak regulation method for thermal power generator set Download PDFInfo
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- CN103216845A CN103216845A CN2013100172569A CN201310017256A CN103216845A CN 103216845 A CN103216845 A CN 103216845A CN 2013100172569 A CN2013100172569 A CN 2013100172569A CN 201310017256 A CN201310017256 A CN 201310017256A CN 103216845 A CN103216845 A CN 103216845A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/32—Direct CO2 mitigation
Abstract
The invention provides a deep peak regulation method for a thermal power generator set. The deep peak regulation method is characterized in that under the condition of being at or below the minimum stable combustion load of the set, atomized ultrafine oil droplets in a small oil gun are ignited by adopting a high-energy igniter, are heated to be gasified in a very short period of time and are then ignited, a high-temperature flame core is produced so as to ignite coal powder, the flame of a big oil gun is replaced with the flame of coal powder airflow through the combustion supporting of the small oil gun, and then, the thermal power generator set is subjected to deep peak regulation. Due to the adoption of the deep peak regulation technology for the thermal power generator set, for the northeast power grid per year, 3 billion kW.h abandoned wind can be utilized, the combustion of coal can be decreased by 999,000 ton, and the emissions can be decreased by 708,900 tons of CO2, 15,242 tons of SO2, 6,133 tons of NOx and 427,088 ton of soot, so that the economic, environmental and social benefits are huge.
Description
Technical field
The present invention relates to a kind of thermal power generation unit degree of depth peak regulation technique, relate in particular to a kind ofly at underload or be lower than under the minimum steady combustion load by few oily combustion supporting technology, the thermal power generation unit carries out degree of depth peak regulation, solves " abandoning wind " problem that exists when electrical network is admitted wind-powered electricity generation.
Background technology
The northeast electrical network is along with the enforcement of low-carbon economy policy, and the ratio of wind-powered electricity generation in electrical network increases gradually, and wind-powered electricity generation surpasses water power becomes the second largest power supply of northeast electrical network, and thermoelectricity net capacity and power load peak-valley difference increase sharply.In the end of the year 2011, annual gross generation 3718.74 hundred million kilowatt hours are netted in northeast, and wherein, thermoelectricity is 3341.63 hundred million kilowatt hours, and wind-powered electricity generation is 237.37 hundred million kilowatt hours, water power 137.85 hundred million kilowatt hours.It is that to 2011 4584 h, 125 h descended by 4709h in 2010 that northeast electrical network fired power generating unit annual in-2011 in 2008 utilizes the actual conditions of hourage.
Secondly, the Northeast and even national wind-powered electricity generation develops the quickest in clean energy resource, because wind-powered electricity generation exerts oneself and have randomness and intermittent characteristics, and the anti-peak regulation characteristic of its power is apparent in view, and promptly low ebb need subtract when sending power, and wind-powered electricity generation is in a big state.Along with the large-scale development of wind-powered electricity generation, particularly putting into operation of ten million multikilowatt wind-powered electricity generation base calculated according to existing operation fired power generating unit low ebb peak modulation capacity, and the peak-load regulating problem is very outstanding.
Have, northeast is in the ever-increasing heat supply unit of extremely frigid zones the whole network in winter ratio again, estimates that to the end of the year 2015, thermoelectric unit peak modulation capacity needs greater than 25%, and conventional condensing fired power generating unit peak modulation capacity need reach more than 55%, and peak-valley difference increases year by year.
In addition, 4 1000 MW units in red power station along the river of building were gone into operation successively in 2012～2015 years, and nuclear power does not participate in peak regulation substantially, and this certainly will aggravate the requirement to fired power generating unit degree of depth peak regulation.
The northeast electrical network has been planned the hydroenergy storage station site of 12500 MW of 11 places, still is in the site generaI investigation stage.
Therefore, electrical network is abandoned the wind mode in a large number and is moved under the condition that other peaking power source is difficult to large-scale application northeastward, how to utilize electrical network fired power generating unit characteristics capacious, tap/dip deep into fired power generating unit peak modulation capacity, take unconventional peak regulation, improve regenerative resource electric power, exploitation thermoelectricity degree of depth peak regulation technique becomes new problem demanding prompt solution.
Summary of the invention
Goal of the invention: the invention provides a kind of thermal power generation unit degree of depth peak regulation method, its objective is the solution not high problem of regenerative resource electric power utilization rate in the past.
Technical scheme: the present invention is achieved by the following technical solutions:
Thermal power generation unit degree of depth peak regulation method, it is characterized in that: this method is at the minimum steady combustion load of unit or is lower than under the minimum steady combustion load, adopt high-energy igniter to light the ultra-fine oil droplet of the atomizing in little oil gun, the ultra-fine oil droplet of atomizing was ignited behind the heating and gasifying in the extremely short time, produce high temperature " fire nuclear " with the coal dust that ignites, combustion-supporting by small oil gun replaces the flame of big oil gun with the flame of breeze airflow, and the thermal power generation unit is carried out degree of depth peak regulation.
The thermal power of oil gun is 465kW.
Advantage and effect: the invention provides a kind of thermal power generation unit degree of depth peak regulation method, few-oil ignition technology of the present invention is that the ultra-fine oil droplet that will atomize ignited behind the heating and gasifying in the extremely short time, produces the technology of high temperature " fire nuclear " with the coal dust that ignites.
The few-oil ignition technology adopts high-energy igniter commonly used to light little oil gun, uses the oil gun firing coal-dust airflow again, replaces the flame of big oil gun with the flame of breeze airflow, reaches the purpose of replace oil with coal.The thermal power of oil gun commonly used is about 465kW in the few-oil ignition technology, much larger than the peak power of at present domestic plasma generator.Since have enough thermal powers, very strong to the coal adaptive capacity, can timely firing coal-dust airflow.
Description of drawings:
Fig. 1 abandoned the wind schematic diagram in 2011 for Liaoning electric power grid of the present invention;
Fig. 2 is the change curve of typical overcritical 600MW unit net coal consumption rate with load
Fig. 3 is the change curve of typical subcritical 600MW unit net coal consumption rate with load
Fig. 4 is the change curve of typical subcritical 300MW unit net coal consumption rate with load
Fig. 5 is the change curve of super-pressure 200MW unit net coal consumption rate with load
Fig. 6 is the change curve of super-pressure 135MW unit net coal consumption rate with load.
The specific embodiment:The present invention is described further below in conjunction with accompanying drawing:
As shown in Figure 1, the invention provides a kind of thermal power generation unit degree of depth peak regulation method, this method is at the minimum steady combustion load of unit or is lower than under the minimum steady combustion load, adopt high-energy igniter to light the ultra-fine oil droplet of the atomizing in little oil gun, the ultra-fine oil droplet of atomizing was ignited behind the heating and gasifying in the extremely short time, produce high temperature " fire nuclear ", combustion-supporting by small oil gun with the coal dust that ignites, replace the flame of big oil gun with the flame of breeze airflow, the thermal power generation unit is carried out degree of depth peak regulation.The thermal power of oil gun is 465kW.
Few-oil ignition still need be compared with the big oil gun of routine with a spot of oily firing coal-dust airflow, and it is about 95% that oil consumption rate reduces, and has remarkable advantages with the reliability and the cost of plasma ignition.
These two kinds of technology are internal combustion burner, are big-and-middle-sized at home power plant and are used widely, and can realize that boiler does not have oil or few-oil ignition and low-load combustion-stabilizing, because the plasma technology starting early, so its achievement is more.
The main feature of two kinds of fuel-economizing firing techniques is as shown in table 1.
The main feature of two kinds of fuel-economizing firing techniques of table 1 relatively
Through contrast as can be known, a little less than the coal adaptability of plasma burner, system complex, the initial cost height, poor reliability, cathode life is short, the maintenance cost height; The coal adaptability of few-oil ignition combustion device is strong, and system is simple, and initial cost is low, good reliability, and the life-span is long, and maintenance cost is low.
The few-oil ignition combustion utensil has the function of low-load combustion-stabilizing and main burner.At present, this technology has been applied in the unit boiler of each level capacity such as grade, and combustion system has been contained tangential firing DC burner and wall firing turbulent burner; Warehouse formula, direct-firing in the middle of pulverized coal preparation system comprises.
Do not throw oily minimum steady combustion ability test
The boiler factory given boiler minimum steady combustion load, because of coal, boiler form, unit capacity difference difference to some extent, the Northeast's bituminous coal, brown coal are abundanter, and the boiler in the electrical network of northeast mostly is greatly breathes out pot production, and the boiler minimum steady combustion load given by the boiler factory is roughly: 200MW45%BMCR; 300MW (350 MW) 35%BMCR; The above 30%BMCR of 600MW.After amounting to into the unit rated load, increase by 5% approximately, i.e. 200MW50%ECR; 300MW (350 MW) 40% ECR; Above 35% ECR of 600MW.CFBB is 35% ECR.Owing to use in test design coal, table 2 is large-sized boiler minimum steady combustion recent years load test result.
Certification test is the result show, under the design coal condition, all the peak modulation capacity of unit all can reach manufactory's set-point, but the ature of coal when considering actual motion is changeable, when appraising and deciding the actual peak regulation of unit load, all gives certain surplus, studies show that this surplus is bigger than normal.
Be lower than the economic experiment of boiler minimum steady combustion load peak regulation technique
Along with unit boiler few-oil ignition development of technology (Plasma Firing Technology does not still break away from the category of tiny-oil ignition and few-oil ignition when boiler cold-state is lighted a fire), cold conditions igniting at the boiler initial stage has obtained extensive use, because the fuel cost height is used also less aspect fired power generating unit degree of depth peak regulation.
Therefore,, when the minimum steady combustion is loaded or be lower than minimum steady combustion load, take the small oil gun combustion supporting technology, increase the security of underrun if make full use of few oily combustion supporting technology.If calculate by the about 4,000 ten thousand kilowatts of unit capacities of working capacity in 2011, will have an appointment 5% ~ 10% reduction space of unit, the northeast electrical network still has about 2,000,000 kilowatts ~ 4,000,000 kilowatts peak modulation capacity, utilizes fired power generating unit can solve the problem that the electrical network wind-powered electricity generation is abandoned wind in a large number.
Table 2 boiler is not thrown oily minimum steady combustion load result and is adjusted the back minimum load
The maximum blowing-out electricity of Liaoning electric power grid in 2011 1620000 kilowatt hours (November 23) of exerting oneself are abandoned wind-powered electricity generation amount 5.62 hundred million kilowatt hours the whole year, wherein, the first quarter is abandoned wind 1.48 hundred million kilowatt hours, the second quarters 1.16 hundred million kilowatt hour, the third seasons 0.2 hundred million kilowatt hour, fourth quarters 2.78 hundred million kilowatt hour.On average abandon wind 1.405 hundred million kilowatt hours per season.As shown in Figure 1:
The average coal consumption 333g/kW.h of fired power generating unit in 2011 uses mark coal 187146t every year on average less.By 850 yuan/t of Liaoning Area mark coal unit price, amount to into 15,908 ten thousand yuans of RMB, discharge flue dust 80366t less, SO
22868t, NOx1154 t, the CO of 132800.6t
2
All kinds of unit degree of depth peak regulations load appraise and decide suggestion
When unit is examined in performance, use design coal, minimum steady combustion load test can both realize smoothly.In the actual motion, other factors by technological progress and management, can progressively be familiar with and be controlled, and fuel is subjected to coal market mechanism and coal supply security implication uncertain factor maximum, has the greatest impact, also the most difficult assurance.
Unit belongs to unconventional peak regulation under degree of depth peak regulation state, the more conventional peaking operation of unit is more complicated, and specification requirement is higher, therefore, must rest on a scientific basis, rational data, confirms this technical indicator.
By further investigation to the unit various characteristics, on the minimum load basis of electric northeastward prison office " northeast electrical network thermal power plant minimum operational mode (2011) " regulation, amid all these factors, further reduce unit load, determine different capabilities, dissimilar unit degree of depth peak regulation load as follows: 200MW55%ECR; 300MW (350 MW) 47% ECR; Above 43% ECR of 600MW; CFBB is 40% ECR.
Wherein, circulating fluidized bed combustion coal boiler load adjusting function is better than the boiler of conventional pulverized-coal, and varying duty is simple to operate, and this superiority is particularly suitable for the service requirement of station boiler.The load adjustment ability of station boiler depends on the quality of Water Circulation Characteristic, steam temperature characteristic and combustion characteristics under the low load condition, and CFBB all has remarkable advantages in these several respects.The load variations scope is big, and adjusting function is good.Load regulation range is 100% ~ 25%BMCR, also can keep smooth combustion under 25% load, and boiler has higher load grade again simultaneously, and rate of change is about 6%MCR/min.Advantage with degree of depth peak regulation, the CFBB thermal inertia is big, and AGC has certain degree of difficulty, but the Northeast is bituminous coal and brown coal mostly, coal is more suitable, as the operation appropriate measures, also can realize.Therefore, CFBB is significantly adjusted, no matter amount of capacity is 40%ECR with the unification of CFBB degree of depth peak regulation load.
In addition, consider that having the unfilled corner operation under underload of fanned powder-grinding system boiler has very big risk, the degree of depth peak regulation of such unit is loaded not to adjust substantially, still maintains 55% ~ 60%.
Degree of depth peak regulation load determines that each peak regulation unit load of back sees Table 2.
The research of unit degree of depth peak regulation economy
Shown in Fig. 2 to 6, Fig. 2～Fig. 6 is the change curve of typical case 135～600MW unit net coal consumption rate with load.
As can be seen, during the peak load regulation operation, be accompanied by the reduction of unit load from Fig. 2 ~ Fig. 6, net coal consumption rate significantly increases, and economy descends, and underload is compared with rated load on average increases coal consumption 18g/kWh approximately, so thermal power plant peaking operation and uneconomical.
Effect
The average minimum load of northeast electrical network fired power generating unit is adjusted to about 48% ECR now by original about 55%ECR.Adopt the oil gun combustion supporting technology, the average minimum load of unit increases 5%ECR～10%ECR again, and the peak modulation capacity of whole electrical network increases 12%ECR～17%ECR behind the employing fired power generating unit degree of depth peak regulation technique.
After adopting fired power generating unit degree of depth peak regulation technique, whole northeast electrical network can utilize 3,000,000,000 kWh to abandon wind (Chinese wind-powered electricity generation in 2011 " is abandoned wind ", and ratio surpasses 12%) every year, few coal-fired 99.9 ten thousand tons, reduces discharging 708900 tons of CO
2, SO
215242 tons, NOx6133t, 427088 tons of flue dust, the fuel saving cost is 84,916 ten thousand yuan altogether, and economic benefit, environmental benefit and social benefit are huge.
Therefore, adopt this technology to help electrical network and admit regenerative resource to greatest extent, realize distributing rationally of the energy, exchange regenerative resource to greatest extent for, save the energy with the primary energy consumption of minimum by electrical network.Realize simultaneously energy-saving and emission-reduction to greatest extent.
The research of thermal power generation unit degree of depth peak regulation technique is multidisciplinary, a multi-specialized project of leap power system, and content contains a plurality of links of power system, and thermal power generation unit degree of depth peak regulation technique is feasible technically.
Studies show that, existing unit minimum is exerted oneself adjust to: 200MW55%ECR; 300MW (350 MW) 47% ECR; Above 43% ECR of 600MW; CFBB is 40% ECR.The average minimum load of unit is adjusted to about 48% ECR now by original about 55%ECR, and on average improving 7% is feasible technically.
Adopt the small oil gun combustion supporting technology, the northeast electrical network can increase the peak modulation capacity of 2000MW ~ 4000MW in addition, though unit economy reduces, can effectively solve the wind problem of abandoning in a large number of wind-powered electricity generation, and overall efficiency significantly increases.
After adopting fired power generating unit degree of depth peak regulation technique, the northeast electrical network can utilize 3,000,000,000 kWh to abandon wind every year, few coal-fired 999000 tons, reduces discharging 708900 tons of CO
2, SO
215242 tons, NOx6133t, 427088 tons of flue dust, economic benefit, environmental benefit and social benefit are huge.
Claims (2)
1. thermal power generation unit degree of depth peak regulation method, it is characterized in that: this method is at the minimum steady combustion load of unit or is lower than under the minimum steady combustion load, adopt high-energy igniter to light the ultra-fine oil droplet of the atomizing in little oil gun, the ultra-fine oil droplet of atomizing was ignited behind the heating and gasifying in the extremely short time, produce high temperature " fire nuclear " with the coal dust that ignites, combustion-supporting by small oil gun replaces the flame of big oil gun with the flame of breeze airflow, and the thermal power generation unit is carried out degree of depth peak regulation.
2. thermal power generation unit degree of depth peak regulation method according to claim 1, it is characterized in that: the thermal power of oil gun is 465kW.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106287675A (en) * | 2016-08-10 | 2017-01-04 | 重庆市富燃科技有限责任公司 | There is Process In A Tangential Firing and the control method thereof of thermoelectricity motility regulatory function |
| CN111144047A (en) * | 2019-12-23 | 2020-05-12 | 华北电力大学 | Coal-fired unit deep peak regulation energy consumption cost calculation method based on plasma ignition technology |
| CN112163383A (en) * | 2020-10-12 | 2021-01-01 | 江苏方天电力技术有限公司 | Coal-fired boiler minimum deep regulation load evaluation method considering coal type and environmental parameter correction |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106287675A (en) * | 2016-08-10 | 2017-01-04 | 重庆市富燃科技有限责任公司 | There is Process In A Tangential Firing and the control method thereof of thermoelectricity motility regulatory function |
| CN111144047A (en) * | 2019-12-23 | 2020-05-12 | 华北电力大学 | Coal-fired unit deep peak regulation energy consumption cost calculation method based on plasma ignition technology |
| CN112163383A (en) * | 2020-10-12 | 2021-01-01 | 江苏方天电力技术有限公司 | Coal-fired boiler minimum deep regulation load evaluation method considering coal type and environmental parameter correction |
| CN112163383B (en) * | 2020-10-12 | 2022-05-27 | 江苏方天电力技术有限公司 | Coal-fired boiler minimum deep regulation load evaluation method considering coal type and environmental parameter correction |
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Application publication date: 20130724 |