CN104930534A - Technology reducing carbon content of boiler fly ash - Google Patents
Technology reducing carbon content of boiler fly ash Download PDFInfo
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- CN104930534A CN104930534A CN201410102899.8A CN201410102899A CN104930534A CN 104930534 A CN104930534 A CN 104930534A CN 201410102899 A CN201410102899 A CN 201410102899A CN 104930534 A CN104930534 A CN 104930534A
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- feed bin
- blanking
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- boiler
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Abstract
The invention discloses a technology reducing carbon content of boiler fly ash. The technology comprises a first step of sieving fuel coal, differentiating fuel coal cast in a fuel coal sieve according to grain size by a classifier, a second step of controlling feeding, controlling feeding time of a first bunker, a second bunker and a third bunker via a control circuit, a third step of mixing fuel coal, evenly mixing feeding coal of the first bunker, the second bunker and the third bunker via a mixing machine, conveying the material evenly mixed to a boiler port, and a fourth step of controlling coal casting speed, controlling mixed material casting time to the port via the control circuit. The technology reducing carbon content of boiler fly ash can be applied to the technical field of boiler burning; a present burning boiler can be improved and a boiler combustion chamber can fully burn; and boiler fuel coal utilization rate can be improved and business economic values can be improved.
Description
Technical field
The present invention relates to technical field of boiler combustion, especially a kind of technique reducing boiler flyash carbon content.
Background technology
At present, the combustion system in most of chemical enterprise does not carry out corresponding optimal design-aside; Charging aperture as boiler does not carry out corresponding feed zone and divides setting, and the lower slag system of boiler will adopt original artificial slag mode etc. for another example.Said structure form and operation format belong to comparatively original operation form, must consume higher labour and fund cost etc., do not meet the strategy of the sustainable energy development of enterprise, also do not meet the measures to rectify and reform that industry energy conservation reduces discharging.
Summary of the invention
The technical problem that the present invention solves is to provide a kind of technique reducing boiler flyash carbon content, effectively can improve the structure of burning boiler of the prior art, effectively can improve the Thorough combustion of boiler furnace, effectively can improve the utilization rate of coal of boiler, effectively can improve business economic and be worth.
For solving the problems of the technologies described above, the invention provides a kind of technique reducing boiler flyash carbon content, it is characterized in that, comprising:
Step a: fire coal sieving operates,
By sifter, input fire coal sieving is distinguished according to particle diameter;
Fire coal particle diameter being less than 0.2mm is stored in the first feed bin, and fire coal particle diameter being greater than 8mm is stored in the second feed bin, is that the fire coal between 0.2mm and 8mm is stored in the 3rd feed bin by particle diameter;
Step b: control blanking operation,
The blanking time of the first feed bin, the second feed bin and the 3rd feed bin is controlled by control circuit;
When the blanking time the first feed bin being detected is 10s, controls the first feed bin and stop blanking; When the blanking time the 3rd feed bin being detected is 10s, controls the 3rd feed bin and stop blanking; When the blanking time the second feed bin being detected is 80s, controls the second feed bin and stop blanking;
Step c: coal-fired married operation,
By mixer, the blanking of the first feed bin, the second feed bin and the 3rd feed bin in step b is mixed, and by the mass transport after mixing to fire door place;
Steps d: control to throw stove speed,
The input fire door time of mixed material is controlled by control circuit;
When input fire door time mixed material being detected is 20s, controls mixed material and stop dropping into, and control described first feed bin, the second feed bin and the 3rd feed bin and start blanking.
The technique of above-mentioned reduction boiler flyash carbon content also can have following features,
Described control circuit is PLC programmable logic controller (PLC).
The technique of above-mentioned reduction boiler flyash carbon content also can have following features,
Described control circuit realizes the detection of blanking time by controlling sensor.
The technique of above-mentioned reduction boiler flyash carbon content also can have following features,
Described control circuit realizes the beginning of the first feed bin, the second feed bin and the 3rd feed bin by Controlling solenoid valve or stops blanking operation.
The technique of above-mentioned reduction boiler flyash carbon content also can have following features,
Described control circuit by Controlling solenoid valve realize mixed material start drop into fire door or stop drop into fire door operation.
Technique scheme of the present invention has following beneficial effect:
The present invention includes: step a: fire coal sieving operates, and is distinguished by input fire coal sieving by sifter according to particle diameter; Fire coal particle diameter being less than 0.2mm is stored in the first feed bin, and fire coal particle diameter being greater than 8mm is stored in the second feed bin, is that the fire coal between 0.2mm and 8mm is stored in the 3rd feed bin by particle diameter; Step b: control blanking operation, controlled the blanking time of the first feed bin, the second feed bin and the 3rd feed bin by control circuit; When the blanking time the first feed bin being detected is 10s, controls the first feed bin and stop blanking; When the blanking time the 3rd feed bin being detected is 10s, controls the 3rd feed bin and stop blanking; When the blanking time the second feed bin being detected is 80s, controls the second feed bin and stop blanking; Step c: coal-fired married operation, is mixed the blanking of the first feed bin, the second feed bin and the 3rd feed bin in step b by mixer, and by the mass transport after mixing to fire door place; Steps d: control to throw stove speed, controlled the input fire door time of mixed material by control circuit; When input fire door time mixed material being detected is 20s, controls mixed material and stop dropping into, and control described first feed bin, the second feed bin and the 3rd feed bin and start blanking; The present invention can realize the size grading of Reasonable adjustment as-fired coal, reduces excessive too small composition in coal grain, coal after-flame degree in stove is enhanced, effectively reduces ash content carbon, improve boiler economics; Technical scheme provided by the invention, through broken, screening, ensures the particle diameter of as-fired coal, ensures the percentage shared by each particle diameter of as-fired coal, allows the coal energy Thorough combustion of various particle diameter.
Detailed description of the invention
For making the object, technical solutions and advantages of the present invention clearly understand, hereinafter will be described in detail to embodiments of the invention.It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can be combined mutually.
The invention provides a kind of technique reducing boiler flyash carbon content, comprising:
Step a: fire coal sieving operates,
By sifter, input fire coal sieving is distinguished according to particle diameter;
Fire coal particle diameter being less than 0.2mm is stored in the first feed bin, and fire coal particle diameter being greater than 8mm is stored in the second feed bin, is that the fire coal between 0.2mm and 8mm is stored in the 3rd feed bin by particle diameter;
Step b: control blanking operation,
The blanking time of the first feed bin, the second feed bin and the 3rd feed bin is controlled by control circuit;
When the blanking time the first feed bin being detected is 10s, controls the first feed bin and stop blanking; When the blanking time the 3rd feed bin being detected is 10s, controls the 3rd feed bin and stop blanking; When the blanking time the second feed bin being detected is 80s, controls the second feed bin and stop blanking;
Step c: coal-fired married operation,
By mixer, the blanking of the first feed bin, the second feed bin and the 3rd feed bin in step b is mixed, and by the mass transport after mixing to fire door place;
Steps d: control to throw stove speed,
The input fire door time of mixed material is controlled by control circuit;
When input fire door time mixed material being detected is 20s, controls mixed material and stop dropping into, and control described first feed bin, the second feed bin and the 3rd feed bin and start blanking.
Preferably, in concrete operations of the present invention,
Described control circuit is PLC programmable logic controller (PLC).
Preferably, in concrete operations of the present invention,
Described control circuit realizes the detection of blanking time by controlling sensor.
Preferably, in concrete operations of the present invention,
Described control circuit realizes the beginning of the first feed bin, the second feed bin and the 3rd feed bin by Controlling solenoid valve or stops blanking operation.
Preferably, in concrete operations of the present invention, described control circuit by Controlling solenoid valve realize mixed material start drop into fire door or stop drop into fire door operation.
Accordingly, present invention also offers a kind of device reducing boiler flyash carbon content, the boiler feed systems be connected successively can be comprised, combustion chamber, cyclone separator, preheater, deduster and chimney 10, boiler feed systems comprises dog-house, sieve unit, feed bin unit, batch mixing unit, bin outlet and control unit; Wherein,
Dog-house, dog-house is used for the input port of boiler furnace fuel;
Sieve unit, sieve unit is connected with charging aperture, and the fuel that sieve unit is used for charging aperture drops into carries out granularity differentiation, and by the fuel reservoir of differentiation in corresponding feed bin; Wherein, in concrete operations, sieve unit can arrange corresponding multiplelevel exit according to different-grain diameter, so that the differentiation that can realize different-grain diameter fire coal is collected, those skilled in the art can select concrete corresponding screening plant according to self needing;
Feed bin unit, feed bin unit comprises the first feed bin, the second feed bin and the 3rd feed bin, first feed bin is less than the fire coal of 0.2mm for storing particle diameter, the second feed bin is greater than the fire coal of 8mm for storing particle diameter, and the 3rd feed bin is fire coal between 0.2mm and 8mm for storing particle diameter;
Batch mixing unit, batch mixing unit is connected with feed bin unit, and batch mixing unit is used for the blanking in the first feed bin, the second feed bin and the 3rd feed bin to mix;
Bin outlet, bin outlet is connected with batch mixing unit, and bin outlet is used for the fire coal of batch mixing unit to drop in boiler furnace; And
Control unit, control unit is connected with feed bin unit, bin outlet, and control unit for controlling the blanking velocity of the first feed bin, the second feed bin and the 3rd feed bin, and controls the discharging speed of bin outlet.
Preferably, in concrete operations of the present invention, comprise
Valve unit, valve unit comprises the first valve, the second valve and the 3rd valve, and the first valve is arranged on the exit of the first feed bin, and the second valve is arranged on the exit of the second feed bin, and the 3rd valve is arranged on the exit of the 3rd feed bin;
Timing unit, timing unit comprises the first timer, the second timer and the 3rd timer, and the first timer is arranged on the first valve place, and the second timer is arranged on the second valve place, and the 3rd timer is arranged on the 3rd valve place;
First timer is for detecting the blanking time of the first feed bin, and the first detection signal is flowed to control unit, second timer is for detecting the blanking time of the second feed bin, and the second detection signal is flowed to control unit, 3rd detection signal for detecting the blanking time of the 3rd feed bin, and is flowed to control unit by the 3rd timer; Control unit controls the folding of the first valve, the second valve and the 3rd valve according to the first detection signal, the second detection signal and the 3rd detection signal.
Preferably, in concrete operations of the present invention, also comprise
4th valve, the 4th valve is connected with bin outlet;
4th timer, the 4th timer is arranged on the 4th valve place;
4th detection signal for detecting the discharging time of bin outlet, and is flowed to control unit by the 4th timer, and control unit controls the folding of the 4th valve according to the 4th detection signal.
Preferably, in concrete operations of the present invention,
Control unit controls the folding of the first valve, the second valve and the 3rd valve specifically according to the first detection signal, the second detection signal and the 3rd detection signal:
When the blanking time that the first timer detects the first feed bin is 10s, controller controls the first valve closes; When the blanking time that the 3rd timer detects the 3rd feed bin is 10s, controller controls the 3rd valve closes; When the blanking time that the second timer detects the second feed bin is 80s, controller controls the second valve closes, and controls the 4th valve opening; The control main purpose of above-mentioned time be in order to ensure first, the 3rd, to drop into ratio be 1:1:8 for the granularity of the second feed bin; Accordingly, those skilled in the art can carry out corresponding time controling according to above-mentioned technology enlightenment according to the need of production of self.
Control unit controls the folding of the 4th valve specifically according to the 4th detection signal:
When the discharging time that the 4th timer detects bin outlet is 20s, controller controls material the 4th valve closes, and controls the first valve, the second valve and the 3rd valve opening.
Preferably, in concrete operations of the present invention, control unit can select PLC programmable logic controller (PLC).
Present inventor is proved by many experiments, CFBB is difficult to grill thoroughly for the coal of particle diameter > 10mm, reason is that it fully can not engage with oxygen, the burning of coal time is inadequate, reduces efficiency of combustion, low slag phosphorus content is increased, but the particle diameter of as-fired coal can not be too little, flue gas can be caused to carry amounts of fine particles secretly increase, increase flying dust concentration, cause unburned carbon in flue dust to increase.CFBB passes through the mode of Inner eycle and outer circulation, extends soot particle, the time of staying of coal grain in stove, is conducive to the combustion of coal grain clean.Participate in Inner eycle coal particle size at 0.3-1mm, and participate in the bed material particle diameter of outer circulation at 0.09-0.3mm, the bed material of particle diameter > 1mm can only in emulsion zone fluidisation, after burning certain hour, surface starts coking, reactivity declines and " inactivation " becomes end slag, and the fine particle major part of particle diameter < 0.09mm once leaves boiler with the form of flying dust through separator, fine particle content is more, unburned carbon in flue dust is higher, therefore, must according to the ash formation of this ature of coal, the Sieving and casing of adjustment as-fired coal, reduce the bed material bigger than normal or on the low side of as-fired coal particle diameter as far as possible, especially the share that as-fired coal particle diameter is less than 0.2mm and > 8mm particle will be controlled.
Based on above-mentioned experimental configuration, preferably, by strengthening the equipment control to crushing system, adding sieve unit, improve the efficiency of coal grain screening, achieving the requirement of CFBB to the particle diameter of coal:
1, as-fired coal particle diameter is 0-10mm;
2, median is 2mm;
3, coal grain amount≤10% of particle diameter < 0.2mm;
4, coal grain amount≤10% of particle diameter > 8mm.
By these measures, the size grading of Reasonable adjustment as-fired coal, reduces excessive too small composition in coal grain, coal after-flame degree in stove is enhanced, effectively reduces ash content carbon, improve boiler economics; Technical scheme provided by the invention, through broken, screening, ensures the particle diameter of as-fired coal, ensures the percentage shared by each particle diameter of as-fired coal, allows the coal energy Thorough combustion of various particle diameter.
Although it is apparent to those skilled in the art that embodiment disclosed by the present invention as above, the embodiment that described content only adopts for ease of understanding the present invention, and be not used to limit the present invention.Those of skill in the art belonging to any the present invention; under the prerequisite not departing from the spirit and scope disclosed by the present invention; any amendment and change can be carried out in the form implemented and details; but scope of patent protection of the present invention, the scope that still must define with appending claims is as the criterion.
Claims (5)
1. reduce a technique for boiler flyash carbon content, it is characterized in that, comprising:
Step a: fire coal sieving operates,
By sifter, input fire coal sieving is distinguished according to particle diameter;
Fire coal particle diameter being less than 0.2mm is stored in the first feed bin, and fire coal particle diameter being greater than 8mm is stored in the second feed bin, is that the fire coal between 0.2mm and 8mm is stored in the 3rd feed bin by particle diameter;
Step b: control blanking operation,
The blanking time of the first feed bin, the second feed bin and the 3rd feed bin is controlled by control circuit;
When the blanking time the first feed bin being detected is 10s, controls the first feed bin and stop blanking; When the blanking time the 3rd feed bin being detected is 10s, controls the 3rd feed bin and stop blanking; When the blanking time the second feed bin being detected is 80s, controls the second feed bin and stop blanking;
Step c: coal-fired married operation,
By mixer, the blanking of the first feed bin, the second feed bin and the 3rd feed bin in step b is mixed, and by the mass transport after mixing to fire door place;
Steps d: control to throw stove speed,
The input fire door time of mixed material is controlled by control circuit;
When input fire door time mixed material being detected is 20s, controls mixed material and stop dropping into, and control described first feed bin, the second feed bin and the 3rd feed bin and start blanking.
2. the technique of reduction boiler flyash carbon content according to claim 1, is characterized in that,
Described control circuit is PLC programmable logic controller (PLC).
3. the technique of reduction boiler flyash carbon content according to claim 1, is characterized in that,
Described control circuit realizes the detection of blanking time by controlling sensor.
4. the technique of reduction boiler flyash carbon content according to claim 1, is characterized in that,
Described control circuit realizes the beginning of the first feed bin, the second feed bin and the 3rd feed bin by Controlling solenoid valve or stops blanking operation.
5. the technique of reduction boiler flyash carbon content according to claim 1, is characterized in that,
Described control circuit by Controlling solenoid valve realize mixed material start drop into fire door or stop drop into fire door operation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410102899.8A CN104930534B (en) | 2014-03-19 | 2014-03-19 | Technology reducing carbon content of boiler fly ash |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410102899.8A CN104930534B (en) | 2014-03-19 | 2014-03-19 | Technology reducing carbon content of boiler fly ash |
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| CN104930534A true CN104930534A (en) | 2015-09-23 |
| CN104930534B CN104930534B (en) | 2017-05-10 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108884991A (en) * | 2016-04-19 | 2018-11-23 | 株式会社神户制钢所 | The method of operation and boiler plant of boiler |
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| CN201281329Y (en) * | 2007-11-23 | 2009-07-29 | 华中科技大学 | Coal fine thickness segregated combustion device |
| US20110247378A1 (en) * | 2009-11-13 | 2011-10-13 | Begley Paul V | Low-Carbon Fertilizers and Processes for Producing the Same |
| CN102527484A (en) * | 2012-02-07 | 2012-07-04 | 周杨 | Circularly breaking and sieving system and method thereof |
| CN102639937A (en) * | 2009-12-14 | 2012-08-15 | Abb研究有限公司 | System and associated method for monitoring and controlling a power plant |
| CN203349293U (en) * | 2013-05-16 | 2013-12-18 | 昆明理工大学 | Blended pulverized coal combustion controlling device |
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2014
- 2014-03-19 CN CN201410102899.8A patent/CN104930534B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201281329Y (en) * | 2007-11-23 | 2009-07-29 | 华中科技大学 | Coal fine thickness segregated combustion device |
| US20110247378A1 (en) * | 2009-11-13 | 2011-10-13 | Begley Paul V | Low-Carbon Fertilizers and Processes for Producing the Same |
| CN102639937A (en) * | 2009-12-14 | 2012-08-15 | Abb研究有限公司 | System and associated method for monitoring and controlling a power plant |
| CN102527484A (en) * | 2012-02-07 | 2012-07-04 | 周杨 | Circularly breaking and sieving system and method thereof |
| CN203349293U (en) * | 2013-05-16 | 2013-12-18 | 昆明理工大学 | Blended pulverized coal combustion controlling device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108884991A (en) * | 2016-04-19 | 2018-11-23 | 株式会社神户制钢所 | The method of operation and boiler plant of boiler |
| CN108884991B (en) * | 2016-04-19 | 2020-09-25 | 株式会社神户制钢所 | Method for operating boiler and boiler plant |
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| CN104930534B (en) | 2017-05-10 |
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Granted publication date: 20170510 Termination date: 20180319 |