CN101349582A - Collecting device for on-line monitoring coarse dust separator outlet coal fine amount - Google Patents
Collecting device for on-line monitoring coarse dust separator outlet coal fine amount Download PDFInfo
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- CN101349582A CN101349582A CNA2008101465960A CN200810146596A CN101349582A CN 101349582 A CN101349582 A CN 101349582A CN A2008101465960 A CNA2008101465960 A CN A2008101465960A CN 200810146596 A CN200810146596 A CN 200810146596A CN 101349582 A CN101349582 A CN 101349582A
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Abstract
The rational proportion of coal dust and air capacity in a coal firing boiler combustor can realize the even coal dust burning in the boiler, increases heat efficiency, and reduces atmospheric pollution. The on-line monitoring and the control of coal dust quantity in coal dust flow to the boiler have great significances for saving energy and consumed material, and reducing polluting emission. The coal dust quantity in the coal dust flow is measured by the coal firing boiler coal dust preparation and burning system, and the coal dust quantity (or weighing concentration) in coal dust flow is measured through adopting an indirect process from the search of extreme dilute phase and gas solid phase flow in the past. And many scientists and engineers at home and abroad have not find an effective and reliable measuring process until now through long-term and a great amount of tests in individual fields. The differences of the process searched by the invention lie in that a coal dust collecting device can monitor on-line the coal dust quantity on the outlet of a coarse powder separator, and the process for measuring coal dust concentration form gas and solid phases is avoided, and the dust return quality and flow in the gas and solid phases can be respectively monitored, thereby not only simplifying the measuring process, but also obtaining more direct, reliable and accurate measuring results, and finding an effective and reliable process for measuring coal dust quantity in the coal dust flow.
Description
Affiliated technical field
The present invention relates to a kind of coal-fired plant boiler coal dust preparation system, the harvester of on-line monitoring coarse dust separator outlet coal fine amount.
Background technology
The rational proportion of coal dust and air capacity can realize that coal dust evenly burns in the stove in the coal-burning boiler burner, improves the thermal efficiency, reduces atmospheric pollution, reduces slag amount, improves the automation level of process control.On-line monitoring and the coal dust amount of control in boiler pulverized coal conveying air-flow are significant for energy-saving and cost-reducing, minimizing disposal of pollutants.
The level of monitoring technology has determined the scientific research level and the modernization of industry degree of a country.The industrial automation instrument development is basic in China's equipment manufacturing industry stagnates, and the whole industry is faced adverse conditions, and has become the key issue of restriction China process industry development.By the coal dust system for measuring quantity--the research of on-line monitoring coarse dust separator outlet coal fine amount harvester and power plant are on probation, realize the instrument and meter for automation upgrading of industries, and for the process industry energy-saving and emission-reduction, realize that comprehensive automation provides technical equipment.
The surveying work of coal dust amount in the defeated powder system of coal-burning boiler, past mostly is to attempt to study the coal dust content (concentration) that adopts from the research of the Dual-Phrase Distribution of Gas olid of utmost point dilute phase in the round-about way measurement breeze airflow, its difficulty is very big.Domestic and international many scientists and engineers have crossed long-term a large amount of trial at field back warp separately, up to the present also do not find a measuring method effectively reliably.The harvester of on-line monitoring coarse dust separator outlet coal fine amount, the method of the present invention's research is different with it, avoid from Dual-Phrase Distribution of Gas olid, measuring the method for coal powder density, only the opaque amount flow that returns in the Dual-Phrase Distribution of Gas olid is monitored, can make measuring method obtain simplifying, and make measurement result more direct, reliable, accurate.Thereby found a method of measuring coal dust amount in the breeze airflow effectively reliably.
Summary of the invention
The objective of the invention is: can measure the new technical equipment of boiler powder-feeding amount again accurately and reliably for a kind of operation conditions of system powder feed system that can monitor is provided.The development of on-line monitoring coarse dust separator outlet coal fine amount harvester is for station boiler energy-saving and emission-reduction, efficient operation, comprehensive automation provide a monitoring technology with independent intellectual property right.
The technical scheme that technical solution problem of the present invention is taked is: be provided with in square casing (1) and measure awl cap (3), be connected with rotating shaft (4), the two ends of rotating shaft are by bearing (5) supporting that is located on band square casing two lateral walls, can rotate around rotating shaft, end in rotating shaft connects a balance bob (6) but the gravitational torque of balancing a survey awl cap side, coaxial connection one gear of the other end of rotating shaft (7), its rotation can pass to moment intermeshing with it rack shaft (10) in proportion, rack shaft vertically acts on the rectangle spring (12), compression deformation power by the rectangle spring passes to Weighing type sensor (16), Weighing type sensor and transmitter (17) can be converted to the DCS scattered control system that the 4-20mA standard analog magnitude of current is exported to the coal-burning power plant with the physical quantity of transmitting by shielded cable (18), after data processing, can on pulpit firefly screen, arbitrarily access online in real time and show a wind band of monitoring boiler powder amount trend flow curve, have numeral instantaneous and the accumulative total pulverized coal flow to show simultaneously.Realize the monitoring of online monitoring coarse dust separator outlet coal fine amount.
The invention has the beneficial effects as follows: the present invention can make the rational proportion of coal dust and air capacity in the coal-burning boiler burner, realizes that coal dust evenly burns in the stove, improves the thermal efficiency, reduces atmospheric pollution and cleaner production, improves the automation level of process control.Deflection does not take place in the position that can adjust the boiler flame center, makes boiler combustion stable and burner hearth is had than the even temperature field, and the face that keeps from heat heating surface high temperature wear booster takes place and alleviate the furnace wall cooling slagging scorification because of local overheating.The instantaneous powder-feeding amount trend curve of on-line monitoring coarse dust separator outlet coal fine amount device can make the operation personnel can monitor the operation conditions of pulverized coal preparation and combustion system at any time, can in time find and the correct abnormal occurrence of handling.According to the total powder-feeding amount of boiler and the net calorific value of coal dust, available positive balance method calculates the thermal efficiency of boiler, grasps boiler unit performance driving economy in real time for the operations staff, guarantees the safety and economy operation of boiler.
Description of drawings
Below in conjunction with Figure of description and embodiment, the present invention is described further.
1. square casings, 2. powder retrieving pipes 3. are measured helical pitch bar 14. closure plates 15. driving heads 16. Weighing type sensors (two-wire system) 17. boxlike transmitters 18. shielded cables 19. organic glass peep-holes 20. access doors in awl cap 4. rotating shafts 5. bearings 6. balance bobs 7. gears 8. supports 9. rectangle spring spools 10. rack shafts 11. tooth bar axle sleeves 12. rectangle springs 13. springs in the accompanying drawing
Embodiment
In the Figure of description: the measurement of the mass rate of on-line monitoring coarse dust separator outlet coal fine is according to measuring transmission and the principle of moment balance of awl cap (3) side with rectangle spring side force square, measures directly that time powder amount mode of mill separator powder retrieving pipe (2) realizes.The raw coal that power plant uses is had the feeder of function of measuring and is sent to coal pulverizer, at first with drying agent (the generally forming) Hybrid Heating of sending in the coal pulverizer by hot-air, contained free moisture to raw coal carries out evaporation drying, raw coal after being dried just can grind, wait to grind when reaching the pulverized coal particle that certain particle size is arranged and to be carried out coal pulverizer by the coal pulverizer ventilation, this part coal dust just can be carried out coal pulverizer, and the weight of the pulverized coal particle of this moment has only reduced the weight that is evaporated out the contained free moisture of raw coal.The coal dust that is carried out coal pulverizer separates through mill separator, isolated defective pulverized coal particle, being returned coal pulverizer by the powder retrieving pipe road by foldback regrinds, remaining breeze airflow is sent mill separator, (for unit pulverized-coal system) this part breeze airflow is referred to as wind one time, directly delivers to the burner combustion of boiler.We know: the weight by coarse dust separator outlet coal fine=enter weight-(Hui Fenliang of the weight+mill separator of the contained free moisture of raw coal that is dried out) of coal pulverizer raw coal, wherein the water cut of coarse dust separator outlet coal fine can and be looked into the weight that coal pulverizer terminal temperature curve map (or experimental formula calculating) obtains evaporating moisture in the raw coal according to former moisture content of coal (all there is the chemical examination record in each operation class).The key of measuring coarse dust separator outlet coal fine amount is the Hui Fenliang that how to monitor mill separator, has had these two numerical value just to equal to monitor the band powder amount of a wind.The online monitoring coarse dust separator outlet coal fine amount device of one cover is installed on the powder retrieving pipe road of every cover mill separator.Because the both sides up and down of this device are in different pressure zones respectively, so require this device should possess two kinds of functions, the firstth, the lock airway dysfunction, prevent to be in than the drying agent of the coal pulverizer inflow point in lower negative pressure district and leak and influence its operate as normal, and reduce the separation efficiency of mill separator to being in the mill separator that the high negative district is arranged.The lock airway dysfunction is by measurement awl cap (3) is under the closed condition, maintain the sealing coal dust post of enough weight on the top of measuring the awl cap, the moment of gravitational torque that its countershaft produced and balance bob (6) end keeps balance, just can produce the effect of lock gas, prevent gas channelling phenomenon.The secondth, have Hui Fenliang in the powder retrieving pipe road of measuring mill separator, when powder retrieving pipe (2) has back powder to fall on the sealing coal dust post, because the moment of this end is greater than balance bob (6) moment, measuring awl cap (3) is pressed off, the coal dust amount that will be higher than sealing coal dust post is discharged from, when the pressure of this part coal dust action of gravity on measurement awl cap passes to rectangle spring (12), it is deformed, the deflection of rectangle spring and its acting force are proportional, the deformation force that the rectangle spring produces directly affacts on the Weighing type sensor (16), and by boxlike transmitter (17) and shielded cable (18), export to the Power Plant DCS scattered control system, after being carried out relevant computing and data processing, time powder numerical quantity that measures on same interface, to contrast the coal dust amount that wind of direct-firing system is given boiler-burner that demonstrates, three traffic trends curves of the Hui Fenliang of mill separator and the coal-supplying amount of raw-fuel feeder, the operation conditions that monitors boiler powder process and combustion system for the operations staff is used, and also has the instantaneous delivery numeral to show simultaneously.In addition, the utilization computer software, time powder numerical quantity according to mill separator, under the condition that does not reduce the coal pulverizer nominal output, the adjustable ventilation that subtracts coal pulverizer, the fineness of control coal pulverizer outlet coal dust is accomplished to reduce back the powder amount and is promoted loss in head, can reduce smoke discharge amount again when reducing power consumption, make boiler powder process and combustion system all can realize energy-conservation, consumption reduction in every respect and reduce discharging.
Claims (2)
1, a kind of harvester of on-line monitoring coarse dust separator outlet coal fine amount is transmission and a principle of moment balance of measuring awl cap (3) side and rectangle spring side force square according to it, and physical quantity is converted to 4-20mA analog electrical flow by Weighing type sensor and transmitter, be transported to that coal-burning power plant's DCS scattered control system demonstrates the trend flow curve of coal dust amount in the breeze airflow and numeral shows instantaneous and accumulative total coal dust amount.
2, according to claim 1, the feature of the harvester of described on-line monitoring coarse dust separator outlet coal fine amount is: the main parts size of being measured helical pitch bar (13) closure plate (14) driving head (15) Weighing type sensor (two-wire system) (16) boxlike transmitter (17) shielded cable (18) organic glass peep-hole (19) access door (20) in awl cap (3) rotating shaft (4) bearing (5) balance bob (6) gear (7) support (8) rectangle spring spool (9) rack shaft (10) tooth bar axle sleeve (11) rectangle spring (12) spring by square casing (1) powder retrieving pipe (2) is constituted.
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2008101465960A CN101349582A (en) | 2008-09-05 | 2008-09-05 | Collecting device for on-line monitoring coarse dust separator outlet coal fine amount |
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| CNA2008101465960A CN101349582A (en) | 2008-09-05 | 2008-09-05 | Collecting device for on-line monitoring coarse dust separator outlet coal fine amount |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101806604A (en) * | 2010-04-15 | 2010-08-18 | 孙家鼎 | Accurate measurement device of powder |
| CN101871798A (en) * | 2010-05-25 | 2010-10-27 | 孙家鼎 | System for accurately measuring power gravity flow at real time |
| CN106709208A (en) * | 2017-01-17 | 2017-05-24 | 西安热工研究院有限公司 | Simple method for calculating lifting pressure head of MB type fall mill |
| CN109297535A (en) * | 2018-09-27 | 2019-02-01 | 国网河北省电力有限公司电力科学研究院 | Station boiler Coal-pulverizing Systems with Ball Mill returns powder monitoring device |
| CN109442465A (en) * | 2018-09-30 | 2019-03-08 | 上海全应科技有限公司 | The fitting sample of the instantaneous powder-feeding amount of pulverized-coal fired boiler chooses and metering method |
-
2008
- 2008-09-05 CN CNA2008101465960A patent/CN101349582A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101806604A (en) * | 2010-04-15 | 2010-08-18 | 孙家鼎 | Accurate measurement device of powder |
| CN101806604B (en) * | 2010-04-15 | 2012-08-15 | 孙家鼎 | Accurate measurement device of powder |
| CN101871798A (en) * | 2010-05-25 | 2010-10-27 | 孙家鼎 | System for accurately measuring power gravity flow at real time |
| CN106709208A (en) * | 2017-01-17 | 2017-05-24 | 西安热工研究院有限公司 | Simple method for calculating lifting pressure head of MB type fall mill |
| CN106709208B (en) * | 2017-01-17 | 2020-03-24 | 西安热工研究院有限公司 | Simple method for calculating lifting pressure head of MB-type fan mill |
| CN109297535A (en) * | 2018-09-27 | 2019-02-01 | 国网河北省电力有限公司电力科学研究院 | Station boiler Coal-pulverizing Systems with Ball Mill returns powder monitoring device |
| CN109297535B (en) * | 2018-09-27 | 2020-10-09 | 国网河北省电力有限公司电力科学研究院 | Powder return monitoring device of storage type powder making system in power station boiler steel ball mill |
| CN109442465A (en) * | 2018-09-30 | 2019-03-08 | 上海全应科技有限公司 | The fitting sample of the instantaneous powder-feeding amount of pulverized-coal fired boiler chooses and metering method |
| CN109442465B (en) * | 2018-09-30 | 2020-06-26 | 上海全应科技有限公司 | Fitting sample selection and metering method for instantaneous powder feeding amount of pulverized coal boiler |
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