CN102893090B - Ignition prevention method and ignition prevention apparatus for crusher - Google Patents
Ignition prevention method and ignition prevention apparatus for crusher Download PDFInfo
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- CN102893090B CN102893090B CN201180024011.8A CN201180024011A CN102893090B CN 102893090 B CN102893090 B CN 102893090B CN 201180024011 A CN201180024011 A CN 201180024011A CN 102893090 B CN102893090 B CN 102893090B
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- pulverizer
- coal
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- fuel
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/04—Safety devices
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C25/00—Control arrangements specially adapted for crushing or disintegrating
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K1/00—Preparation of lump or pulverulent fuel in readiness for delivery to combustion apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K3/00—Feeding or distributing of lump or pulverulent fuel to combustion apparatus
- F23K3/02—Pneumatic feeding arrangements, i.e. by air blast
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K2201/00—Pretreatment of solid fuel
- F23K2201/10—Pulverizing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K2203/00—Feeding arrangements
- F23K2203/10—Supply line fittings
- F23K2203/102—Flashback safety, e.g. inertizing devices
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- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Disintegrating Or Milling (AREA)
Abstract
Disclosed is an ignition prevention apparatus for a crusher, having supply adjustment means (3a, 3b); a density measurement means (7) for measuring the density of carbon monoxide and/or carbon dioxide at the outlet of a crusher (5); and a storage means (11) for storing, as an analysis value, the ratio between the fixed carbon content fraction and the volatile matter content fraction in solid fuel. In the crusher (5) for crushing the solid fuel, a control means (11) controls the supply adjustment means (3a, 3b) so that the ratio between the fixed carbon content fraction and the volatile matter content fraction in the solid fuel supplied to the crusher (5) is changed on the basis of measurement results of the density measurement means (7) and analysis values. With this structure, ignition can be prevented within the crusher (5).
Description
Technical field
The present invention relates to the prevention method on fire and anti-locking apparatus on fire pulverized as the solid-fuelled pulverizer of boiler oil.
Background technology
Using solid fuel as in the boiler of fuel, the solid fuel pulverized by pulverizer is supplied to together with conveyance air.
In Japan, because bituminous coal high for ignition temperature to be used for the fuel of boiler, so not too receive publicity for the on fire of pulverizer.Though in pulverized coal firing boiler in the early stage, as the countermeasure after breaking out of fire, in pulverizer, be provided with system and the fracture plate (rupture disk) of supply inert gas (steam etc.).
On the other hand, abroad, in the 1980's, owing to using the western colm produced, there are many breaking out of fires in pulverizer in the particularly U.S., the experience and lessons of blast.From now on, Japan will use colm, the coal that namely ignition temperature is low and ub-bituminous coal, and the chance of upgrading brown coal (UBC) etc. also can increase, and what therefore need to detect in advance in pulverizer is on fire, and is prevented it.
In patent document 1, disclose a kind of coal/organic matter fuel mix reducing mechanism, it is in coal supply pipe coal being supplied to the grater pulverizing coal, supply living beings (biomass) quantitatively, thus the ratio stabilisation of the coal amount making to be supplied in grater and biomass fuel doses, prevent the on fire of living beings, and then make the operating condition stabilisation of grater.
In addition, in patent document 2, disclose a kind of device and be equipped with this device coal-burning boiler equipment, this device is by comparing mixing air at grinding mill inlet temperature measurement value and grinding mill inlet temperature set point, when grinding mill inlet temperature measurement value reaches more than grinding mill inlet temperature set point, reduce grinding mill outlet temperature setting value, thus prevent the fire accident that the excessive rising because of grinding mill inlet temperature causes, while proceed the control of grinding mill outlet temperature.
In addition, in patent document 3, publicly-owned a kind of roller mill device, it is according to the inlet temperature being controlled grinding mill by the quantity delivered of crushed material, reduces the change of the outlet temperature of grinding mill, prevents the on fire of coal dust.
In addition, in patent document 4, disclose a kind of coal pulverizer air temperature control device, it is by measuring the temperature added in warm-air pipe and coal pulverizer, control the temperature and the quantity delivered that are supplied to the air of coal pulverizer, thus stop possibility on fire.
In addition, in patent document 5, disclose and a kind ofly prevent grinding mill outlet temperature control method on fire, it tries to achieve raw coal moisture by grinding mill inlet temperature with to the coal-supplying amount of grinding mill, according to this raw coal moisture, setting grinding mill outlet temperature, thus make grinding mill outlet temperature become the optimum value corresponding with raw coal moisture and prevent on fire.
In addition, in patent document 6, disclose a kind of coal dust combustion method preventing micro mist from exploding, its be detect in micro mist hopper coal dust glow and naked light fired state time, the conveyance medium of coal dust is replaced to inert gas from air, explodes to prevent micro mist.
[look-ahead technique document]
[patent document]
[patent document 1] Japanese Unexamined Patent Publication 2004-347241 publication
[patent document 2] Japanese Unexamined Patent Publication 2006-102666 publication
[patent document 3] Japanese Unexamined Patent Publication 4-244246 publication
[patent document 4] Japanese Laid-Open Patent Publication 56-152750 publication
[patent document 5] Japanese Laid-Open Patent Publication 63-315158 publication
[patent document 6] Japanese Laid-Open Patent Publication 63-267814 publication
But under present situation, also there is no a kind of solid-fuelled running index low for the ignition temperature not yet envisioned up to now.Therefore, not knowing should with which type of operating condition, and specifically, not knowing exactly should with what kind of inlet/outlet temperature and fuel feed operate crusher.Therefore, expect to obtain the operating condition for safe handling pulverizer, what prevent in pulverizer is on fire.
Summary of the invention
The object of the invention is to, a kind of prevention method on fire of the pulverizer on fire that can prevent in pulverizer and anti-locking apparatus on fire are provided.
The prevention method on fire of pulverizer of the present invention, it is the prevention method on fire of the pulverizer of pulverized solid fuel, it is characterized in that, the ratio of point rate of the fixed carbon in more than one solid fuel and volatile matter rate is tried to achieve in advance as assay value, measure the concentration of carbon monoxide in the gas of the outlet of described pulverizer and/or carbon dioxide, based on measurement result and the described assay value of described concentration, make to be supplied to the ratio change of fixed carbon point rate in more than one the solid fuel described of described pulverizer and volatile matter rate, adjustment like this forms more than one each the solid-fuelled quantity delivered solid-fuelled described being supplied to described pulverizer.
In the past, if supply hot blast (conveyance air), while the solid fuel using ignition temperature low in pulverized solid fuel pulverizer, then in pulverizer, be there is danger on fire by the fuel heated.And, in pulverizer, if there is the oxidation reaction as the fuel of omen on fire, then, in the gas of the outlet of pulverizer, carbon monoxide and carbon dioxide can be detected.Therefore, in order to prevent pulverize on fire, in pulverizer, need the oxidation reaction of the fuel as omen on fire is not occurred, that is, need in the outlet of pulverizer in gas, do not make carbon monoxide and carbon dioxide be detected.
At this, the fixed carbon in more than one solid fuel divides the ratio of rate and volatile matter rate lower, and more than one solid-fuelled ignition temperature more reduces.This be considered to due to, fixed carbon divides the ratio of rate and volatile matter rate lower, and under low temperature, the volatile matter of imflammable gas etc. is more easily released, thus more on fire.Therefore, if make the ratio of fixed carbon point rate and volatile matter rate uprise, adjustment like this is supplied to more than one each solid-fuelled quantity delivered solid-fuelled of pulverizer, more than one the solid-fuelled ignition temperature being then supplied to pulverizer uprises, in in pulverizer, the oxidation reaction as the fuel of omen on fire is difficult to occur.
But, merely improve fixed carbon and divide the ratio of rate and volatile matter rate, improve more than one the solid-fuelled ignition temperature being supplied to pulverizer, cheapness and the low solid-fuelled quantity delivered of ignition temperature can not be increased.Reducing to realize cost, under needing, in pulverizer, degree on fire does not occur, increasing cheap and ignition temperature is low solid-fuelled quantity delivered as far as possible.
Therefore, carbon monoxide in the gas of the outlet of measurement pulverizer and/or the concentration The of carbon dioxide are measured, when its result does not detect carbon monoxide and carbon dioxide, because there is not the oxidation reaction of the fuel as omen on fire, so based on the assay value of trying to achieve in advance, make the ratio step-down of fixed carbon point rate in solid fuel and volatile matter rate, namely, make solid-fuelled ignition temperature step-down, so adjustment forms more than one each the solid-fuelled quantity delivered solid-fuelled being supplied to pulverizer.Specifically, be exactly the solid-fuelled quantity delivered increasing the low side of ignition temperature, thus reduce more than one solid-fuelled ignition temperature.Thus, the solid-fuelled quantity delivered that cheap and ignition temperature is low increases, and reduces therefore, it is possible to realize cost.
On the other hand, carbon monoxide in the gas of the outlet of measurement pulverizer and/or the concentration of carbon dioxide, its result is even when a small amount of carbon monoxide and carbon dioxide only being detected, oxidation reaction then as the fuel of omen on fire occurs, therefore based on the assay value of trying to achieve in advance, make the ratio step-down of fixed carbon point rate in solid fuel and volatile matter rate, namely, make solid-fuelled ignition temperature step-down, so adjustment forms more than one each the solid-fuelled quantity delivered solid-fuelled being supplied to pulverizer.Specifically, be exactly the solid-fuelled quantity delivered reducing the low side of ignition temperature, thus improve more than one solid-fuelled ignition temperature.Thus, the solid-fuelled quantity delivered that cheap and ignition temperature is low reduces, but in pulverizer, the oxidation reaction of the fuel as omen on fire can not occur, and in the gas of the outlet of pulverizer, can't detect carbon monoxide and carbon dioxide.Therefore, even if use the low solid fuel of ignition temperature, what also can prevent in pulverizer is on fire, prevents the fire of pulverizer and the such disaster of blast.
In addition, in the prevention method on fire of pulverizer of the present invention, described solid fuel can be at least one of coal and biomass fuel.According to above-mentioned formation, cheapness and the low coal of ignition temperature and biomass fuel can be used to substitute the fat coal of high price and the high bituminous coal of ignition temperature etc., thus it is on fire to prevent in pulverizer, can realize again cost and reduce.
In addition, the on fire anti-locking apparatus of pulverizer of the present invention, it is the on fire anti-locking apparatus of the pulverizer of pulverized solid fuel, it is characterized in that, have following mechanism: quantity delivered guiding mechanism, its adjustment forms more than one each the solid-fuelled quantity delivered solid-fuelled being supplied to described pulverizer; Concentration measuring mechanism, it measures the concentration of carbon monoxide in the gas of the outlet of described pulverizer and/or carbon dioxide; Storing mechanism, it stores the ratio of fixed carbon point rate in more than one solid fuel described and volatile matter rate as assay value; Controlling organization, the described assay value that its measurement result based on described concentration measuring mechanism and described storing mechanism store, make to be supplied to the ratio change of fixed carbon point rate in more than one the solid fuel described of described pulverizer and volatile matter rate, so control described quantity delivered guiding mechanism.
According to above-mentioned formation, as above-mentioned, if make the ratio of fixed carbon point rate and volatile matter rate uprise, adjustment like this forms more than one each the solid-fuelled quantity delivered solid-fuelled being supplied to pulverizer, more than one the solid-fuelled ignition temperature being then supplied to pulverizer uprises, in pulverizer, be difficult to the oxidation reaction as the fuel of omen on fire occurs.
Therefore, carbon monoxide in the gas of the outlet of measurement pulverizer and/or the concentration of carbon dioxide, when carbon monoxide and carbon dioxide consequently not detected, because do not occur as the oxidation reaction of the fuel of omen on fire, so based on the assay value of trying to achieve in advance, make the ratio step-down of fixed carbon point rate in solid fuel and volatile matter rate, namely, make solid-fuelled ignition temperature step-down, so adjustment forms more than one each the solid-fuelled quantity delivered solid-fuelled being supplied to pulverizer.Specifically, be exactly the solid-fuelled quantity delivered increasing the low side of ignition temperature, thus reduce more than one solid-fuelled ignition temperature.Thus, the solid-fuelled quantity delivered that cheap and ignition temperature is low increases, and reduces therefore, it is possible to realize cost.
On the other hand, carbon monoxide in the gas of the outlet of measurement pulverizer and/or the concentration of carbon dioxide, its result is even when a small amount of carbon monoxide and carbon dioxide being detected, oxidation reaction then as the fuel of omen on fire occurs, therefore based on the assay value of trying to achieve in advance, the ratio of point rate of the fixed carbon in solid fuel and volatile matter rate is uprised, namely, solid-fuelled ignition temperature is uprised, and so adjustment forms more than one each the solid-fuelled quantity delivered solid-fuelled being supplied to pulverizer.Specifically, be exactly the solid-fuelled quantity delivered reducing the low side of ignition temperature, thus improve more than one solid-fuelled ignition temperature.Thus, the solid-fuelled quantity delivered that cheap and ignition temperature is low reduces, but in pulverizer, the oxidation reaction as the fuel of omen on fire can not occur, and in the gas of the outlet of pulverizer, can't detect carbon monoxide and carbon dioxide.Therefore, even if use the low solid fuel of ignition temperature, what also can prevent in pulverizer is on fire, prevents the fire of pulverizer and the such disaster of blast.
In addition, in the on fire anti-locking apparatus of pulverizer of the present invention, described solid fuel can be at least one of coal and biomass fuel.According to above-mentioned formation, cheapness and the low coal of ignition temperature and biomass fuel can be used to substitute the fat coal of high price and the high bituminous coal of ignition temperature etc., thus it is on fire to prevent in pulverizer, can realize again cost and reduce.
According to prevention method on fire and the anti-locking apparatus on fire of pulverizer of the present invention, carbon monoxide in the gas of the outlet of measurement pulverizer and/or the concentration of carbon dioxide, its result is even when a small amount of carbon monoxide and carbon dioxide only being detected, then based on assay value, the ratio of point rate of the fixed carbon in solid fuel and volatile matter rate is uprised, that is, solid-fuelled ignition temperature is uprised, so adjustment forms more than one each the solid-fuelled quantity delivered solid-fuelled being supplied to pulverizer.Thus, in pulverizer, the oxidation reaction as the fuel of omen on fire can not occur, and therefore, even if use the low solid fuel of ignition temperature, what also can prevent in pulverizer is on fire, prevents the fire of pulverizer and the such disaster of blast.
Accompanying drawing explanation
Fig. 1 is the skeleton diagram of the on fire anti-locking apparatus representing pulverizer.
Fig. 2 represents that coal dust plays the skeleton diagram of fire test device.
Fig. 3 is the figure representing the ratio of fixed carbon point rate and volatile matter rate and the relation of ignition temperature.
Detailed description of the invention
Below, with reference to accompanying drawing, while be preferred embodiment described for of the present invention.Also have, in the following embodiments, use coal to be illustrated as solid fuel, but solid fuel is not limited thereto, also can be biomass fuel and mud carbide etc., also can use the two or more of coal, biomass fuel, mud carbide etc.
(formation of the on fire anti-locking apparatus of pulverizer)
The on fire anti-locking apparatus 10 of the pulverizer of present embodiment, as shown in Figure 1, has as follows: coal regulating device for supply quantity (quantity delivered guiding mechanism) 3a, 3b, its adjustment from coal bunker 1,2 quantity delivereds being supplied to coal A, B of mixer 4; Apparatus for measuring concentration (concentration measuring mechanism) 7, it measures the carbonomonoxide concentration in the gas of the outlet of pulverizer 5; Arithmetic unit (storing mechanism, controlling organization) 11, it controls coal regulating device for supply quantity 3a, 3b respectively.Further, apparatus for measuring concentration 7 also can measure the gas concentration lwevel in the gas of the outlet of pulverizer 5, also can measure the concentration of carbon monoxide and carbon dioxide respectively.
Coal bunker 1,2 keeps two kinds of coals A, B respectively.The coal A that coal bunker 1 keeps and the coal B that coal bunker 2 keeps, fixed carbon divides the ratio (fuel ratio) of rate and volatile matter rate different.Mixer 4 mixes two kinds of coals A, B supplying from coal bunker 1,2.Be supplied to the quantity delivered of the coal A of mixer 4 from coal bunker 1, adjusted by coal regulating device for supply quantity 3a, be supplied to the quantity delivered of the coal B of mixer 4 from coal bunker 2, adjusted by coal regulating device for supply quantity 3b.
Pulverizer 5 is pulverized the mixed coal that mixed by mixer 4 and is made it to become coal dust.From air feeder 12 to pulverizer 5, the conveyance of supply conveyance coal dust is with air (hot blast).By this conveyance air, the coal dust in pulverizer 5 is dried while be transported to coal burner 8.At this, according to the measurement result of the ignition temperature of coal dust described later, in order to make coal dust not on fire, the temperature of the conveyance air (hot blast) of the entrance of preferred pulverizer 5 is in less than 200 DEG C.Carbonomonoxide concentration in the gas of the outlet of pulverizer 5, is measured by apparatus for measuring concentration 7.Coal burner 8 makes coal dust firing.Boiler 9 makes coal dust firing and reclaims heat.
At this, if the coal using ignition temperature low in pulverizer 5, then in pulverizer 5, exist by the fuel (coal dust) that heats danger on fire.So in pulverizer 5, if occurred as the oxidation reaction of the fuel of omen on fire, then carbon monoxide and carbon dioxide occur, and carbon monoxide will be detected by apparatus for measuring concentration 7.Therefore, on fire in order to what prevent in pulverizer 5, need in pulverizer 5, the oxidation reaction of the fuel as omen on fire do not occurred, that is, in the gas of the outlet of pulverizer 5, make carbon monoxide and and carbon dioxide be not detected.
Further, if use the fat coal of the bituminous coal that ignition temperature is high etc., then, in the gas of the outlet of pulverizer 5, can't detect carbon monoxide and carbon dioxide.This is because, compare the temperature of the conveyance air (hot blast) being supplied to pulverizer 5, temperature one side that fuel starts oxidation reaction is much higher.
In arithmetic unit 11, store the coal proterties of the fixed carbon point rate, volatile matter rate etc. of coal A and coal B in advance as analyzing data (assay value), and store the fuel ratio of mixed coal as analyzing data (assay value).In addition, in arithmetic unit 11, the measurement data (measurement result) of the carbonomonoxide concentration in the gas of the outlet of the pulverizer 5 that input concentration measurement mechanism 7 is measured.Then, arithmetic unit 11 use the composite rate of coal A, B as with, based on from apparatus for measuring concentration 7 measurement data and analyze data, the fuel ratio of the mixed coal being supplied to pulverizer 5 change, so respectively control coal regulating device for supply quantity 3a, 3b.Thus, coal A, B is changed respectively to the quantity delivered of mixer 4.
At this, the fuel ratio of mixed coal (coal dust) is lower, and the ignition temperature of mixed coal (coal dust) more reduces.This be considered to due to, fuel ratio is lower, and low temperature and the volatile matter of imflammable gas etc. are more easily released, thus more on fire.Therefore, if make fuel ratio uprise, adjustment is supplied to the quantity delivered of coal A, B of pulverizer 5 so respectively, then the ignition temperature of coal dust uprises, and in pulverizer 5, the oxidation reaction as the fuel of omen on fire will be difficult to occur.
But, improve fuel ratio merely, improve and be supplied to the ignition temperature of the mixed coal of pulverizer 5, the quantity delivered of cheapness and the low coal of ignition temperature can not be increased.Reducing to realize cost, under needing, in pulverizer 5, degree on fire does not occur, increasing the cheap and quantity delivered of coal that ignition temperature is low as far as possible.
(work of the on fire anti-locking apparatus of pulverizer)
Next, for the work of the on fire anti-locking apparatus 10 of the pulverizer of above-mentioned formation, that is, the prevention method on fire of pulverizer is described.
From two kinds of coals A, B that coal bunker 1,2 supplies, mixed machine 4 mixes and is fed into pulverizer 5 as mixed coal.Be supplied to the quantity delivered of the coal A of mixer 4 from coal bunker 1, adjusted by coal regulating device for supply quantity 3a, be supplied to the quantity delivered of the coal B of mixer 4 from coal bunker 2, adjusted by coal regulating device for supply quantity 3b.
Mixed coal is pulverized by pulverizer 5 and becomes coal dust, by conveyance air, dried while be transported to coal burner 8.Coal dust is burnt by coal burner 8, and the heat produced by burning is reclaimed by boiler 9.Carbonomonoxide concentration in the gas of the outlet of pulverizer 5, is measured by apparatus for measuring concentration 7.In addition, the oxygen concentration in the gas of the outlet of pulverizer 5, is measured by measuring equipment for oxygen concentration ard 6.The measurement data (measurement result) of the carbonomonoxide concentration in the gas of the outlet of the pulverizer 5 that apparatus for measuring concentration 7 is measured, is transfused to arithmetic unit 11.
In arithmetic unit 11, be previously stored with the coal proterties of the fixed carbon point rate, volatile matter rate etc. of coal A and coal B as analysis data (assay value), and store the fuel ratio of mixed coal as analysing data (assay value).Arithmetic unit 11 uses the composite rate of coal A, B as parameter, based on from apparatus for measuring concentration 7 measurement data and analyze data, the fuel ratio of the mixed coal being supplied to pulverizer 5 change, so respectively control coal regulating device for supply quantity 3a, 3b.Thus, coal A, B changes respectively to the quantity delivered of mixer 4.
Specifically, measure the carbonomonoxide concentration in the gas of the outlet of pulverizer 5, when its result does not detect carbon monoxide, oxidation reaction as the fuel of omen on fire does not occur, therefore arithmetic unit 11 is based on the analysis data of trying to achieve in advance (relation of fuel ratio and ignition temperature), control coal regulating device for supply quantity 3a, 3b respectively, make the fuel ratio step-down of mixed coal, namely, make the ignition temperature step-down of mixed coal, adjustment is supplied to the quantity delivered of coal A, B of pulverizer 5 so respectively.Specifically, draw the quantity delivered of the coal adding the low side of ignition temperature exactly, reduce the ignition temperature of mixed coal.Thus, because cheap and the quantity delivered of coal that ignition temperature is low increases, reduce so cost can be realized.Further, when carbon monoxide not detected, also can not control coal regulating device for supply quantity 3a, 3b, not making the fuel ratio of mixed coal change.
On the other hand, measure the carbonomonoxide concentration in the gas of the outlet of pulverizer 5, its result is even when a small amount of carbon monoxide only being detected, oxidation reaction then as the fuel of omen on fire occurs, and therefore arithmetic unit 11 is based on the analysis data of trying to achieve in advance, controls coal regulating device for supply quantity 3a, 3b respectively, the fuel ratio of mixed coal is improved, that is, make the ignition temperature of mixed coal improve, adjustment is supplied to the quantity delivered of coal A, B of pulverizer 5 so respectively.Specifically, be exactly the quantity delivered of the coal reducing the low side of ignition temperature, improve the ignition temperature of mixed coal.Thus, the quantity delivered of the coal that cheap and ignition temperature is low reduces, but in pulverizer 5, the oxidation reaction as the fuel of omen on fire can not occur, and in the gas of the outlet of pulverizer 5, can't detect carbon monoxide.Therefore, even if use the low coal of ignition temperature, what also can prevent in pulverizer 5 is on fire, prevents the fire of pulverizer 5 and the such disaster of blast.
In addition, as above-mentioned, biomass fuel also can be used as solid fuel.And by using cheapness and the low coal of ignition temperature and biomass fuel, substitute the fat coal of high price and the high bituminous coal of ignition temperature etc., what can either prevent in pulverizer 5 is on fire, can realize again cost and reduce.
Further, the carbonomonoxide concentration setting threshold value also can measured for apparatus for measuring concentration 7.Threshold value is exactly the carbonomonoxide concentration when pulverizer 5 fuel (coal dust) is on fire, is tens of ppm.So when the carbonomonoxide concentration of the measurement of apparatus for measuring concentration 7 is very close to threshold value, make the fuel ratio of mixed coal uprise, that is, make the ignition temperature of mixed coal uprise, adjustment is supplied to the quantity delivered of coal A, B of pulverizer 5 respectively.In addition, when carbonomonoxide concentration is fully away from threshold value, make the fuel ratio step-down of mixed coal, that is, make the ignition temperature step-down of mixed coal, adjust the quantity delivered of coal A, the B being supplied to pulverizer 5 via mixer 4 so respectively.Further, when the abundant threshold value far away of carbonomonoxide concentration, the fuel ratio of mixed coal also can be made to change.
So, for carbonomonoxide concentration setting threshold value, carry out the control of coal regulating device for supply quantity 3a, 3b, what can either prevent in pulverizer 5 is on fire, fully can use again cheapness and the low coal of ignition temperature, realize cost and reduce.
(relation of fuel ratio and ignition temperature)
Next, the relation for the fuel ratio in more than one solid fuel and ignition temperature is described.In order to control coal regulating device for supply quantity 3a, 3b respectively, arithmetic unit 11 is needed to hold fuel ratio in more than one solid fuel in advance.Therefore, use different three kinds of coals A, B, the C of fuel ratio one or more, investigate the ignition temperature of the coal dust pulverized.In this tune Check, the coal dust shown in Fig. 2 is used to play fire test device 21.The coal proterties of three kinds of coals A, B, C is shown in table 1.
[table 1]
| Coal kind | Coal A | Coal B | Coal C |
| Fuel ratio | 1.55 | 1.21 | 0.91 |
| Volatile ingredient [wt%-DB] | 35.24 | 43.07 | 49.09 |
| Fixed carbon [wt%-DB] | 54.58 | 52.21 | 44.64 |
| Three compositions | |||
| Combustible component [%] | 87.31 | 89.94 | 86.63 |
| Non-combustible composition [%] | 9.90 | 4.46 | 5.79 |
| Moisture [%] | 2.78 | 5.60 | 7.58 |
| Add up to [%] | 100 | 100 | 100 |
| Chemical composition (dry measure value) | |||
| Carbon C [%-DB] | 73.45 | 75.46 | 68.34 |
| Hydrogen H [%-DB] | 4.95 | 5.44 | 5.30 |
| Oxygen O [%-DB] | 9.07 | 12.04 | 18.79 |
| Sulphur S [%-DB] | 0.59 | 0.74 | 0.32 |
| Nitrogen N [%-DB] | 1.75 | 1.60 | 0.98 |
| Chlorine Cl [%-DB] | 0.00 | 0.00 | 0.00 |
| Ash content [%-DB] | 10.18 | 4.72 | 6.27 |
| Add up to [wt%-DB] | 100 | 100 | 100 |
| Caloric value | |||
| Gross calorific power [kcal/kg-AD] | 7,148 | 6,981 | 6,036 |
Coal dust plays fire test device 21, has as follows: the vertical reaction tube 22 of cylinder of internal diameter φ 25mm × 700L; Quantitative coal dust is supplied to the pulverized coal feeder 23 in the vertical reaction tube 22 of cylinder; Be located at the heater 24 of the periphery of the vertical reaction tube 22 of cylinder; Supply by the gas feed line 25 of the mist heated in the vertical reaction tube 22 of cylinder; Be located at the receiving vessel 27 of the below of the vertical reaction tube 22 of cylinder; Be located at the carbonomonoxide concentration meter 26 of the bottom of the vertical reaction tube 22 of cylinder; Be located at the fracture plate 29 of the top of the vertical reaction tube 22 of cylinder.
The atmosphere temperature of the inside of the vertical reaction tube 22 of cylinder, can utilize heater 24, from normal temperature to about 400 DEG C, and longitudinally heating up roughly equably along the vertical reaction tube 22 of cylinder.At this, the programming rate of the atmosphere temperature of the inside of the vertical reaction tube 22 of cylinder, makes it to be adjusted to about 5 DEG C/min.
In addition, in the side of the vertical reaction tube 22 of cylinder, along longitudinally, 8 places are provided with thermocouple jack, in these thermocouple jacks, are inserted with the armouring K thermocouple 28 of external diameter φ 1mm respectively.By these armourings K thermocouple 28, the atmosphere temperature on the central shaft of the inside of the vertical reaction tube 22 of cylinder can be measured.
Gas feed line 25 has as follows: mixing nitrogen (gas that partial pressure of oxygen is lower than air) and air and make the mixing chamber 31 of mist; Measure the oxymeter 32 of the oxygen concentration in mist; That heats mist adds hot heater 33.Fracture plate 29 is closed usually, if become high pressure in the vertical reaction tube 22 of cylinder, then becomes open mode.
At this, in order to test under the condition identical with pulverizer 5, and establish several experimental condition.That is, as experimental condition, moisture containing ratio is used to be adjusted to the coal dust of the scope of 4.0 ~ 5.0% in advance.In addition, as experimental condition, making particle diameter be the ratio of the coal dust of less than 75 μm is more than 80%.In addition, as experimental condition, Air/Coal ratio (be supplied to the vertical reaction tube 22 of cylinder by the amount [L/min] of mist that heats and the ratio of coal quantity delivered [g/min]) is made to be 1.7.In addition, as experimental condition, the coal dust holdup time be trapped in the vertical reaction tube of cylinder 22 is made to be about 6 seconds.In addition, suppose that coal dust particle is mobile in the vertical reaction tube 22 of cylinder with the speed identical with mist.In addition, assuming that coal dust can not adhere to and be deposited in the inside of pulverizer 5.
From the quantitative coal dust of pulverized coal feeder supply, fall in the vertical reaction tube 22 of cylinder in deadweight.In addition, be fed in the vertical reaction tube 22 of cylinder from gas feed line 25 by the mist heated.In the vertical reaction tube 22 of cylinder, coal dust and mist are heated to identical temperature.Thereafter, coal dust is fallen system from the flange part 22a of the bottom of the vertical reaction tube 22 of cylinder, accumulates in receiving vessel 27.
If coal dust, being stranded in the holdup time in the vertical reaction tube 22 of cylinder, rises to the temperature that coal dust is on fire, then the carbonomonoxide concentration meter 26 being arranged at the bottom of the vertical reaction tube 22 of cylinder detects the rising of carbonomonoxide concentration.While make the partial pressure of oxygen of the mist be supplied in the vertical reaction tube 22 of cylinder change, and utilize heater 24 that the atmosphere temperature in the vertical reaction tube 22 of cylinder is changed, while carry out repeating test, the carbonomonoxide concentration calculated in the gas of the outlet of the vertical reaction tube 22 of cylinder reaches the moment of more than 30ppm, the mean value of the atmosphere temperature in the vertical reaction tube 22 of cylinder, in this, as the ignition temperature of coal dust.Further, also can measure the gas concentration lwevel in the gas of the outlet of the vertical reaction tube 22 of cylinder, thus calculate the ignition temperature of coal dust.
The measurement result display of the ignition temperature of the coal dust that the ratio (fuel ratio) of rate and volatile matter rate is parameter is divided in figure 3 with the fixed carbon of coal.According to the measurement result of the ignition temperature of coal dust, fuel ratio is lower, and the ignition temperature of coal dust reduces more linearly.This be considered to due to, fuel ratio is lower, and under low temperature, the volatile matter of imflammable gas etc. is more easily released, thus more on fire.Therefore, control the fuel ratio in solid fuel, on fire from the view point of in pulverizer 5, be considered to the operating condition making pulverizer 5 safety work.In addition, from the measurement result of the ignition temperature of coal dust, in order to prevent the on fire of coal dust, the temperature of the conveyance air (hot blast) of the entrance of pulverizer 5 is preferably made to be in less than 200 DEG C.
(modified embodiment of the present embodiment)
Above, embodiments of the present invention are described, but are only exemplified with concrete example, but not be particularly limited to the present invention, concrete formation etc. can change by suitable design.In addition, the functions and effects described in working of an invention mode, but be the effect enumerating the best produced by the present invention, and effect of the present invention does not limit by described in embodiments of the present invention.
Such as, the control of coal regulating device for supply quantity 3a, 3b of being undertaken by arithmetic unit 11, not by above-mentioned restriction.Even if apparatus for measuring concentration 7 does not detect carbonomonoxide concentration, also the fuel ratio in solid fuel can be made to uprise, namely, solid-fuelled ignition temperature is uprised, adjustment like this forms more than one each the solid-fuelled quantity delivered solid-fuelled being supplied to pulverizer 5, even if apparatus for measuring concentration 7 detects carbonomonoxide concentration, if its value is lower than threshold value, then also can make the fuel ratio step-down in solid fuel, namely, make solid-fuelled ignition temperature step-down, adjustment like this forms more than one each the solid-fuelled quantity delivered solid-fuelled being supplied to pulverizer 5.In a word, as long as do not occur in pulverizer 5 in scope on fire, adjustment is supplied to more than one solid-fuelled quantity delivered of pulverizer 5.
The application based on the Japanese patent application (patent application 2010-113447) applied on May 17th, 2010, its content this with reference to and quote.
[utilizability in industry]
The present invention is useful for the fire prevention of pulverizer solid-fuelled in boiler.
[symbol description]
1,2 coal bunkers
3a, 3b coal regulating device for supply quantity (quantity delivered guiding mechanism)
4 mixers
5 pulverizers
7 apparatus for measuring concentration (concentration measuring mechanism)
8 coal burners
9 boilers
The on fire anti-locking apparatus of 10 pulverizers
11 arithmetic units (storing mechanism, controlling organization)
21 coal dusts play fire test device
The vertical reaction tube of 22 cylinder
23 pulverized coal feeders
24 heaters
25 gas feed line
26 carbonomonoxide concentration meters
27 receiving vessels
28 armouring K thermocouples
32 oxymeters
33 heaters
Claims (4)
1. a prevention method on fire for pulverizer, is characterized in that, is the prevention method on fire of the pulverizer of pulverized solid fuel, wherein,
Try to achieve the ratio of fixed carbon point rate in more than one solid fuel and volatile matter rate in advance as assay value,
Measure the concentration of carbon monoxide in the gas in the exit of described pulverizer and/or carbon dioxide,
Based on measurement result and the described assay value of described concentration, make to be supplied to the ratio change of fixed carbon point rate in more than one the solid fuel described of described pulverizer and volatile matter rate, when carbon monoxide and carbon dioxide not detected, make this than reduction, when carbon monoxide and carbon dioxide being detected, make this than uprising, so adjustment forms more than one each the solid-fuelled quantity delivered solid-fuelled described being supplied to described pulverizer.
2. the prevention method on fire of pulverizer according to claim 1, is characterized in that, described solid fuel is at least one in coal and biomass fuel.
3. an on fire anti-locking apparatus for pulverizer, is characterized in that, be the on fire anti-locking apparatus of the pulverizer of pulverized solid fuel, it has:
Quantity delivered guiding mechanism, its adjustment forms more than one each the solid-fuelled quantity delivered solid-fuelled being supplied to described pulverizer;
Concentration measuring mechanism, it measures the concentration of carbon monoxide in the gas in the exit of described pulverizer and/or carbon dioxide;
Storing mechanism, its fixed carbon stored in more than one solid fuel described divides the ratio of rate and volatile matter rate as assay value,
Controlling organization, the described assay value that its measurement result based on described concentration measuring mechanism and described storing mechanism store, to make to be supplied to described in described pulverizer the ratio change of fixed carbon point rate in more than one solid fuel and volatile matter rate, when carbon monoxide and carbon dioxide not detected, this is made to compare step-down, when carbon monoxide and carbon dioxide being detected, making this than the mode uprised, controlling described quantity delivered guiding mechanism.
4. the on fire anti-locking apparatus of pulverizer according to claim 3, is characterized in that, described solid fuel is at least one in coal and biomass fuel.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2010-113447 | 2010-05-17 | ||
| JP2010113447A JP5385851B2 (en) | 2010-05-17 | 2010-05-17 | Crusher ignition prevention method and ignition prevention device |
| PCT/JP2011/060785 WO2011145483A1 (en) | 2010-05-17 | 2011-05-10 | Ignition prevention method and ignition prevention apparatus for crusher |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102893090A CN102893090A (en) | 2013-01-23 |
| CN102893090B true CN102893090B (en) | 2015-04-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201180024011.8A Expired - Fee Related CN102893090B (en) | 2010-05-17 | 2011-05-10 | Ignition prevention method and ignition prevention apparatus for crusher |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP5385851B2 (en) |
| KR (1) | KR101397885B1 (en) |
| CN (1) | CN102893090B (en) |
| WO (1) | WO2011145483A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6238285B2 (en) * | 2013-02-26 | 2017-11-29 | 一般財団法人電力中央研究所 | Coal combustion apparatus and coal combustion method |
| US9746179B2 (en) | 2013-03-15 | 2017-08-29 | General Electric Technology Gmbh | System and method for low load operation of coal mill |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4653698A (en) * | 1983-08-01 | 1987-03-31 | The Babcock & Wilcox Company | Safety system for coal pulverizers |
| CN87106998A (en) * | 1986-10-18 | 1988-06-15 | 巴布考克日立株式会社 | Method for combustion of pulverized coal and device thereof |
| CN1069111A (en) * | 1991-07-26 | 1993-02-17 | Evt能源有限公司 | Coal powder burner |
| JP3806250B2 (en) * | 1998-07-08 | 2006-08-09 | 三菱重工業株式会社 | Pulverized coal combustion equipment |
| JP2008215710A (en) * | 2007-03-05 | 2008-09-18 | Tokyo Electric Power Co Inc:The | Solid biomass fuel supply device |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IN166429B (en) * | 1986-04-29 | 1990-05-05 | Babcock & Wilcox Co | |
| JP3377263B2 (en) * | 1993-10-18 | 2003-02-17 | 三井造船株式会社 | Crusher explosion prevention device |
| JPH08121711A (en) * | 1994-10-19 | 1996-05-17 | Hitachi Ltd | Pulverized coal combsition method and pulverized coal combustion device and pulverized coal burner |
| JP2000018569A (en) * | 1998-06-30 | 2000-01-18 | Mitsubishi Heavy Ind Ltd | Fuel supply quantity controller and cement production equipment utilizing the same |
| JP2004347241A (en) * | 2003-05-22 | 2004-12-09 | Mitsubishi Heavy Ind Ltd | Coal-organic matter fuel mixture grinding device |
| JP5110684B2 (en) | 2007-02-15 | 2012-12-26 | 太平洋セメント株式会社 | Operation method of drying equipment |
-
2010
- 2010-05-17 JP JP2010113447A patent/JP5385851B2/en active Active
-
2011
- 2011-05-10 KR KR1020127030110A patent/KR101397885B1/en active IP Right Grant
- 2011-05-10 WO PCT/JP2011/060785 patent/WO2011145483A1/en active Application Filing
- 2011-05-10 CN CN201180024011.8A patent/CN102893090B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4653698A (en) * | 1983-08-01 | 1987-03-31 | The Babcock & Wilcox Company | Safety system for coal pulverizers |
| CN87106998A (en) * | 1986-10-18 | 1988-06-15 | 巴布考克日立株式会社 | Method for combustion of pulverized coal and device thereof |
| CN1069111A (en) * | 1991-07-26 | 1993-02-17 | Evt能源有限公司 | Coal powder burner |
| JP3806250B2 (en) * | 1998-07-08 | 2006-08-09 | 三菱重工業株式会社 | Pulverized coal combustion equipment |
| JP2008215710A (en) * | 2007-03-05 | 2008-09-18 | Tokyo Electric Power Co Inc:The | Solid biomass fuel supply device |
Also Published As
| Publication number | Publication date |
|---|---|
| KR101397885B1 (en) | 2014-05-20 |
| CN102893090A (en) | 2013-01-23 |
| KR20130009850A (en) | 2013-01-23 |
| WO2011145483A1 (en) | 2011-11-24 |
| JP5385851B2 (en) | 2014-01-08 |
| JP2011242032A (en) | 2011-12-01 |
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