CN202868676U - Boiler hearth negative pressure control device of large-size biomass direct-combustion circulating fluidized bed - Google Patents
Boiler hearth negative pressure control device of large-size biomass direct-combustion circulating fluidized bed Download PDFInfo
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- CN202868676U CN202868676U CN 201220177356 CN201220177356U CN202868676U CN 202868676 U CN202868676 U CN 202868676U CN 201220177356 CN201220177356 CN 201220177356 CN 201220177356 U CN201220177356 U CN 201220177356U CN 202868676 U CN202868676 U CN 202868676U
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Abstract
The utility model discloses a boiler hearth negative pressure control device of a large-size biomass direct-combustion circulating fluidized bed. A negative pressure signal of a hearth negative pressure adjustment loop is processed by a hearth negative pressure adaptive filter to form an available hearth negative pressure signal; and a hearth negative pressure measurement value firstly passes through an intelligent signal filter consisting of a plurality of filter coefficient schedulers, a filter coefficient comprehensive adder, a filter nominal time generator, a filter time comprehensive multiplier, an inert filter and the like, so that a phenomenon that hearth negative pressure is greatly and frequently fluctuated because of complicated components and large possibility in burst combustion of the conventional biomass fuel is avoided, and a signal which can really reflect the change of negative pressure in a hearth can be obtained. The boiler hearth negative pressure control device has been successfully used in the first 2*50MW large-size biomass direct combustion circulating fluidized bed boiler power generation plant, and hearth negative pressure control of the boiler is well realized; and commercial running is successfully realized.
Description
Technical field
The utility model relates to a kind of low ignition point fuel (such as living beings, fuel oil etc.) CFBB operating control device that is applicable to burn, espespecially a kind of CFBB pressure control device that causes the furnace pressure acute variation when adopting auto-adaptive filtering technique to overcome biomass burning.
Background technology
In recent years, CFBB (CFB) has obtained developing rapidly with characteristics such as its combustion system that cleans, fuel tolerance are wide, and biomass direct-fired CFBB power generation project also rises thereupon.The fuel of biomass direct-fired CFBB mainly is forestry biomass, agricultural biomass etc., specifically comprises fuel wood, fallen leaves, bark, tree root, forestry processing waste, bagasse, sugarcane top, stalk, shell, fruit stone, corncob etc.In the boiler running process, furnace pressure control is extremely important.When unit load changes, then enter the fuel quantity of burner hearth and the change that first and second air quantity will be followed, the fuel also thereupon change of atmosphere of burn in burner hearth can impact furnace pressure.If furnace pressure is excessively low, the inleakage of burner hearth and flue will increase, and can make burn deterioration, and combustible loss increases, even causes combustion instability or fire extinguishing.In addition, can cause that also overheating steam temperature rising and increasing soot particle are to the wearing and tearing of heating surface and air-introduced machine.Otherwise if furnace pressure is too high, flame and high-temperature flue gas will to outward leakage, affect the safe operation of boiler in the burner hearth.Therefore, combustion chamber draft must be controlled automatically, maintains within certain allowed band to guarantee combustion chamber draft.For biomass direct-fired CFBB, because the characteristics such as its propellant composition changes greatly, fugitive constituent is high, ignition point is low, in the biomass fuel combustion process, be prone to larger combustion fluctuation, especially moment a large amount of fugitive constituents occur easily and separates out and cause violent burning after biomass fuel enters burner hearth, combustion chamber draft sharply raises, yet the fugitive constituent burning velocity is fast, continuation is poor, the combustion chamber draft fast reducing, the combustion chamber draft variation can reach ± 500Pa, even reach ± 1000Pa, have a strong impact on combustion safety and the stability of boiler unit.Therefore, in biomass direct-fired CFBB running, furnace pressure control ratio conventional fuel boiler is more important.Method by control solves the problems such as furnace pressure fluctuation that caused by biomass fuel, the assurance biomass fuel combustion is stable, keep biomass electric power plant safety, stable operation, become biomass fermentation group of motors large-scale promotion application, the key technology that must solve.
The utility model content
Technical problem to be solved in the utility model just provides a kind of biomass direct-fired boiler hearth of circulating fluidized bed negative pressure control apparatus that causes the furnace pressure acute variation when adopting auto-adaptive filtering technique to overcome biomass burning.
Solve the problems of the technologies described above, the technical solution adopted in the utility model is as follows:
The upright combustion boiler hearth of circulating fluidized bed of macro-organism negative pressure control apparatus is characterized in that comprising: the combustion chamber draft sef-adapting filter loop 10 and the combustion chamber draft main regulation loop 20 that connect successively:
Composition and the annexation in described combustion chamber draft sef-adapting filter loop 10 are: a plurality of filter factor schedulers are inputted respectively corresponding batcher revolution signal, are exported the comprehensive adder 101 of the filter factor of batcher more than to, and the comprehensive adder 101 of many batchers filter factor and filtering nominal time generator 102 export respectively comprehensive multiplier 103 of filtering time to;
Composition and the annexation in described combustion chamber draft main regulation loop 20 are: comprise functional operation device 201, deviation alarm 202, combustion chamber draft PID controller 203, the comprehensive adder 204 of setting value, feedforward adder 205, air inducing balancer 206, the manual/auto switch 207 of A air-introduced machine, the manual/auto switch 208 of B air-introduced machine;
The outputs of deviation alarm 202 input combustion chamber draft sef-adapting filter loops 10 and comprehensive adder 204, just to excise combustion chamber draft automatic in case both differences transfinite, and changes by Artificial Control;
The output in the combustion chamber draft PID controller 203 comprehensive adders 204 of input and combustion chamber draft sef-adapting filter loop 10, export feedforward adder 205 to;
The output of the input of feedforward adder 205 a wind instruction (PAB), Secondary Air instruction (SAB) instruction and combustion chamber draft PID controllers 203, export air inducing balancer 206 to;
Composition and the annexation of described batcher filter factor scheduler are: the actual speed signal of batcher is divided into two-way--and one the tunnel successively through proportion differential device and the first function calculator, exports after another Lu Jingdi 2 function calculators are transferred to adder.
Beneficial effect: the utility model causes the furnace pressure acute variation when adopting auto-adaptive filtering technique to overcome biomass burning, method by control solves the problems such as furnace pressure fluctuation that caused by biomass fuel, can guarantee that biomass fuel combustion is stable, keep biomass electric power plant safety, stable operation, the utility model has become the key technology of biomass fermentation group of motors large-scale promotion application.
Description of drawings
Fig. 1 is that the macro-organism matter boiler hearth of circulating fluidized bed negative pressure control apparatus of the utility model embodiment forms and annexation figure;
Fig. 2 is composition and the annexation figure in the combustion chamber draft sef-adapting filter loop of Fig. 1 embodiment;
Fig. 3 is the filter factor scheduler schematic diagram of Fig. 1 embodiment.
The specific embodiment
Such as Fig. 1, Fig. 2 and shown in Figure 3, the upright combustion boiler hearth of circulating fluidized bed of macro-organism of the present utility model negative pressure control apparatus comprises combustion chamber draft sef-adapting filter loop 10 and combustion chamber draft main regulation loop 20.
Referring to Fig. 2, combustion chamber draft sef-adapting filter loop 10 contains: correspond respectively to No. 1 to the filter factor scheduler 11,12,13,14,15,16,17,18 of No. 8 batchers, and the comprehensive adder 101 of many batchers filter factor, filtering nominal time generator 102, comprehensive multiplier 103 of filtering time and digital filter device 104.
Referring to Fig. 3, take batcher filter factor scheduler 11 as example, it is combined by proportion differential device 111, the first function calculator 112, the 2nd function calculator 113 and adder 114.The actual speed signal passing ratio differentiator of No. 1 batcher and the first function calculator are obtained the unidirectional normalization rate of change of feeding coal amount after processing; After the actual speed signal of No. 1 batcher is also processed by the second function calculator, obtain the normalization variable quantity of feeding coal; The normalization feeding coal variable quantity and the rate of change amount thereof that obtain are sent into respectively adder 114, just can calculate normalization filter factor corresponding to this TV station batcher according to variation and the rate of change thereof of feeding coal.
After each batcher is delivered to corresponding filter factor scheduler handle with the actual speed signal, the normalization filter factor amount of output batcher rotation speed change and rate of change thereof, the normalization filter factor amount of each batcher rotating speed is delivered to respectively the comprehensive adder of same many batchers filter factor, in the comprehensive adder of many batchers filter factor, different weight coefficients is given to the feed filter factor of respectively sending in physical distribution position according to each batcher, and the comprehensive adder of many batchers filter factor multiply by the integrated filter coefficient that its weight coefficient calculates many batchers according to sending into each real-time batcher filter factor.
Deliver to comprehensive multiplier 103 of filtering time by many batchers integrated filter coefficient that the comprehensive adder 101 of many batchers filter factor calculates.In addition, filtering nominal time generator 102 produces the unit filtering time, its output is connected to the other end of comprehensive multiplier 103 of filtering time, the continuous variation of corresponding many batcher feeding coals calculates the combustion chamber draft filtering time that correspondence is sent into total feeding coal in the burner hearth in comprehensive multiplier 103 of filtering time.
Total feeding coal filtering time that comprehensive multiplier calculates is delivered to the external filtering time end of digital filter device 104, and another input of digital filter device receives the combustion chamber draft signal.
So, when the biomass feeding amount of sending into burner hearth changes, the combustion chamber draft sef-adapting filter just can according to the pace of change of feeding coal, variable quantity, and change location send the corresponding filtering time, combustion chamber draft is carried out adaptive-filtering, eliminate because the biomass combustion quantitative change causes that the furnace pressure acute variation is to the violent interference in hearth vacuum control loop, guarantee hearth vacuum control loop normal regulating, keep the flameholding of biomass recirculating fluidized bed boiler.
Referring to Fig. 1, combustion chamber draft regulating loop 20 contains functional operation device 201, deviation alarm 202, combustion chamber draft PID controller 203, the comprehensive adder 204 of setting value, feedforward adder 205, air inducing balancer 206, the manual/auto switch 207 of A air-introduced machine, the manual/auto switch 208 of B air-introduced machine.
The quantity of steam changing value is sent into the comprehensive adder 204 of setting value through the combustion chamber draft setting value that functional operation device 201 calculates under the different load, and what the other end of comprehensive adder was inputted is manual correction, forms the combustion chamber draft setting value in the final adder.
Combustion chamber draft PID controller 203 is input as the output of comprehensive adder 204 and the output in combustion chamber draft sef-adapting filter loop 10, then exports feedforward adder 205 to.
Feedforward adder 205 also accesses a wind instruction PAB, the Secondary Air instruction SAB instruction after normalized, the output of combustion chamber draft PID controller, wind feed forward control signal, Secondary Air feed-forward control signals are being delivered to air inducing balancer 206 after forming feedforward, feedback integration control signal after the adder COMPREHENSIVE CALCULATING.
Claims (2)
1. biomass direct-fired boiler hearth of circulating fluidized bed negative pressure control apparatus is characterized in that: comprise the combustion chamber draft sef-adapting filter loop (10) and the combustion chamber draft main regulation loop (20) that connect successively:
Composition and the annexation in described combustion chamber draft sef-adapting filter loop (10) are: a plurality of filter factor schedulers are inputted respectively corresponding batcher revolution signal, are exported the comprehensive adder of the filter factor of batcher more than (101) to, and the comprehensive adder of many batchers filter factor (101) and filtering nominal time generator (102) export respectively comprehensive multiplier of filtering time (103) to;
Composition and the annexation in described combustion chamber draft main regulation loop (20) are: comprise functional operation device (201), deviation alarm (202), combustion chamber draft PID controller (203), set value comprehensive adder (204), feedforward adder (205), air inducing balancer (206), the manual/auto switch of A air-introduced machine (207), the manual/auto switch of B air-introduced machine (208);
Functional operation device (201) is inputted the quantity of steam changing value, is exported setting value comprehensive adder (204) to, set value comprehensive adder (204) other end input be manual correction, finally set value and form the combustion chamber draft setting value in the comprehensive adder (204);
Deviation alarm (202) input combustion chamber draft sef-adapting filter loop (10) and the output that sets value comprehensive adder (204), just to excise combustion chamber draft automatic in case both differences transfinite, and changes by Artificial Control;
The output in combustion chamber draft PID controller (203) input setting value comprehensive adder (204) and combustion chamber draft sef-adapting filter loop (10), export feedforward adder (205) to;
The feedforward adder (205) input wind instruction, Secondary Air instruction and combustion chamber draft PID controller (203) output, export air inducing balancer (206) to;
Air inducing balancer (206) exports respectively the manual/auto switch of A air-introduced machine (207) and the manual/auto switch of B air-introduced machine (208) to, the manual/auto switch of A air-introduced machine (207) and the manual/auto switch of B air-introduced machine (208) are controlled respectively the rotating speed of A, B air-introduced machine.
2. biomass direct-fired boiler hearth of circulating fluidized bed negative pressure control apparatus according to claim 1, it is characterized in that: the composition of described filter factor scheduler and annexation are: the actual speed signal of batcher is divided into two-way-first via and exports after the 2nd function calculator is transferred to adder through proportion differential device and the first function calculator, the second tunnel successively.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220177356 CN202868676U (en) | 2012-04-25 | 2012-04-25 | Boiler hearth negative pressure control device of large-size biomass direct-combustion circulating fluidized bed |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201220177356 CN202868676U (en) | 2012-04-25 | 2012-04-25 | Boiler hearth negative pressure control device of large-size biomass direct-combustion circulating fluidized bed |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102788349A (en) * | 2012-04-25 | 2012-11-21 | 广东电网公司电力科学研究院 | Large-sized biomass direct-fired circulating fluidized bed boiler furnace negative pressure control device |
| CN103423741A (en) * | 2013-08-05 | 2013-12-04 | 浙江大学 | Energy-saving optimal system and method for circulating fluidized bed boiler |
| CN104848194A (en) * | 2015-05-13 | 2015-08-19 | 国家电网公司 | Method and system for draft control of thermal power generating unit applicable to environmental-friendly control technology |
-
2012
- 2012-04-25 CN CN 201220177356 patent/CN202868676U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102788349A (en) * | 2012-04-25 | 2012-11-21 | 广东电网公司电力科学研究院 | Large-sized biomass direct-fired circulating fluidized bed boiler furnace negative pressure control device |
| CN102788349B (en) * | 2012-04-25 | 2014-12-10 | 广东电网公司电力科学研究院 | Large-sized biomass direct-fired circulating fluidized bed boiler furnace negative pressure control device |
| CN103423741A (en) * | 2013-08-05 | 2013-12-04 | 浙江大学 | Energy-saving optimal system and method for circulating fluidized bed boiler |
| CN103423741B (en) * | 2013-08-05 | 2015-10-28 | 浙江大学 | The energy-conservation optimization system of CFBB and method |
| CN104848194A (en) * | 2015-05-13 | 2015-08-19 | 国家电网公司 | Method and system for draft control of thermal power generating unit applicable to environmental-friendly control technology |
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Granted publication date: 20130410 |