CN102893090A - 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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- CN102893090A CN102893090A CN2011800240118A CN201180024011A CN102893090A CN 102893090 A CN102893090 A CN 102893090A CN 2011800240118 A CN2011800240118 A CN 2011800240118A CN 201180024011 A CN201180024011 A CN 201180024011A CN 102893090 A CN102893090 A CN 102893090A
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- pulverizer
- coal
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- fuel
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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 pulverize prevention method on fire and anti-locking apparatus on fire as the solid-fuelled pulverizer of boiler oil.
Background technology
In the boiler that acts as a fuel with solid fuel, the solid fuel of being pulverized by pulverizer is supplied to air with conveyance.
In Japan, because the bituminous coal that ignition temperature is high is used for the fuel of boiler, so not too receive publicity for the on fire of pulverizer.Though in the pulverized coal firing boiler in the early stage, as the countermeasure after the breaking out of fire, in pulverizer, be provided with system and the fracture plate (rupture disk) of supplying with inert gas (steam etc.).
On the other hand, abroad, particularly in the 1980's, owing to using the western colm that produces, there are many breaking out of fires in pulverizer in the U.S., the experience and lessons of blast.From now on, Japan will use colm, coal and ub-bituminous coal that namely ignition temperature is low, and the chance of upgrading brown coal (UBC) etc. also can increase, and therefore needs to detect in advance on fire in the pulverizer, and it is prevented.
In patent documentation 1, disclose a kind of coal/organic matter fuel mix reducing mechanism, it is in the coal supply pipe that coal is supplied to the grater of pulverizing coal, supply with quantitatively biomass (biomass), thereby make the coal amount that supplies in the grater and the ratio stabilisation of biomass fuel quantity, prevent the on fire of biomass, and then make the operating condition stabilisation of grater.
In addition, in patent documentation 2, disclose a kind of installed and be equipped with this device coal-burning boiler equipment, this device is by comparing mixing air in grinding mill inlet temperature instrumentation value and grinding mill inlet temperature setting value, reaching the grinding mill inlet temperature in grinding mill inlet temperature instrumentation value sets value when above, reduce grinding mill outlet temperature setting value, thereby Yi Bian prevent the accident on fire that the excessive rising because of the grinding mill inlet temperature causes, Yi Bian proceed the control of grinding mill outlet temperature.
In addition, in patent documentation 3, publicly-owned a kind of roller mill device, it reduces the variation of the outlet temperature of grinding mill according to the inlet temperature of being controlled grinding mill by the quantity delivered of crushed material, prevents the on fire of coal dust.
In addition, in patent documentation 4, disclose a kind of coal pulverizer air temperature control device, it adds temperature in warm-air pipe and the coal pulverizer by measurement, control supplies to temperature and the quantity delivered of the air of coal pulverizer, thereby stops possibility on fire.
In addition, in patent documentation 5, disclose a kind of grinding mill outlet temperature control method on fire that prevents, it is to try to achieve former moisture content of coal by the grinding mill inlet temperature with to the coal-supplying amount of grinding mill, according to this former moisture content of coal, set the grinding mill outlet temperature, thereby make the grinding mill outlet temperature become the optimum value corresponding with former moisture content of coal and prevent on fire.
In addition, in patent documentation 6, disclose a kind of coal dust combustion method that prevents micro mist blast, it is to detect glowing and during the naked light fired state, the conveyance medium of coal dust being replaced to inert gas from air, to prevent the micro mist blast of coal dust in the micro mist hopper.
[look-ahead technique document]
[patent documentation]
[patent documentation 1] TOHKEMY 2004-347241 communique
[patent documentation 2] TOHKEMY 2006-102666 communique
[patent documentation 3] Japanese kokai publication hei 4-244246 communique
[patent documentation 4] Japanese kokai publication sho 56-152750 communique
[patent documentation 5] Japanese kokai publication sho 63-315158 communique
[patent documentation 6] Japanese kokai publication sho 63-267814 communique
Yet under the present situation, also there is not up to now a kind of low solid-fuelled running index of ignition temperature for not yet envisioning.Therefore, not knowing should with which type of operating condition, and specifically, not knowing exactly should be with what kind of inlet/outlet temperature and fuel feed operate crusher.Therefore, expectation obtains the operating condition for the safe handling pulverizer, prevents on fire in the pulverizer.
Summary of the invention
The object of the invention is to, a kind of prevention method on fire and anti-locking apparatus on fire that can prevent the pulverizer on fire in the pulverizer is 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 assay value that is compared to of minute rate of the fixed carbon in more than one the solid fuel and volatile matter rate is tried to achieve in advance, measure carbon monoxide in the gas of outlet of described pulverizer and/or the concentration of carbon dioxide, measurement result and described assay value based on described concentration, fixed carbon minute rate in described more than one the solid fuel that supplies to described pulverizer and the ratio of volatile matter rate are changed, so adjust and consist of described more than one solid-fuelled each the solid-fuelled quantity delivered that supplies to described pulverizer.
In the past, if Yi Bian supply with hot blast (conveyance air), Yi Bian use the low solid fuel of ignition temperature in the pulverized solid fuel pulverizer, then in pulverizer, there was danger on fire in heated fuel.And, in pulverizer, if oxidation reaction as the fuel of omen on fire occurs, then in the gas of the outlet of pulverizer, can detect carbon monoxide and carbon dioxide.Therefore, on fire in preventing from pulverizing in pulverizer, need to make the oxidation reaction as the fuel of omen on fire not occur, that is, need in the outlet of pulverizer in the gas, carbon monoxide and carbon dioxide are detected.
At this, the fixed carbon in more than one the 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 because, fixed carbon divides the ratio of rate and volatile matter rate lower, the volatile matter of imflammable gas etc. is more easily emitted under the low temperature, thereby easier to be on fire.Therefore, if the ratio of fixed carbon minute rate and volatile matter rate is uprised, so adjust more than one solid-fuelled each the solid-fuelled quantity delivered that supplies to pulverizer, more than one the solid-fuelled ignition temperature that then supplies to pulverizer uprises, in in pulverizer, be difficult to occur as the oxidation reaction of the fuel of omen on fire.
But, merely improve the ratio of fixed carbon minute rate and volatile matter rate, improve more than one the solid-fuelled ignition temperature that supplies to pulverizer, can not increase cheapness and the low solid-fuelled quantity delivered of ignition temperature.In order to realize cost, need to not occur in pulverizer increases cheapness and the low solid-fuelled quantity delivered of ignition temperature under the degree on fire 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 the oxidation reaction as the fuel of omen on fire does not occur, so based on the assay value of trying to achieve in advance, make fixed carbon minute rate in the solid fuel and the ratio step-down of volatile matter rate, namely, make solid-fuelled ignition temperature step-down, so adjust and consist of more than one solid-fuelled each the solid-fuelled quantity delivered that supplies to pulverizer.Specifically, increase exactly the low side's of ignition temperature solid-fuelled quantity delivered, thereby reduce more than one solid-fuelled ignition temperature.Thus, the solid-fuelled quantity delivered that cheapness and ignition temperature are low increases, and therefore can 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 only detecting a small amount of carbon monoxide and carbon dioxide, then the oxidation reaction as the fuel of omen on fire occurs, therefore based on the assay value of trying to achieve in advance, make fixed carbon minute rate in the solid fuel and the ratio step-down of volatile matter rate, namely, make solid-fuelled ignition temperature step-down, so adjust and consist of more than one solid-fuelled each the solid-fuelled quantity delivered that supplies to pulverizer.Specifically, reduce exactly the low side's of ignition temperature solid-fuelled quantity delivered, thereby improve more than one solid-fuelled ignition temperature.Thus, the solid-fuelled quantity delivered that cheapness and ignition temperature are low reduces, but in pulverizer, the oxidation reaction as the fuel of omen on fire can not occur, in the gas of the outlet of pulverizer, can't detect carbon monoxide and carbon dioxide.Therefore, even use the low solid fuel of ignition temperature, also can prevent on fire in the pulverizer, prevent fire and the such disaster of blast of pulverizer.
In addition, in the prevention method on fire of pulverizer of the present invention, described solid fuel can be at least a of coal and biomass fuel.According to above-mentioned formation, coal that can ignition temperature is low with cheapness and biomass fuel substitute high price and the fat coal of the high bituminous coal of ignition temperature etc., thereby can either prevent on fire in the pulverizer, can realize cost again.
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: the quantity delivered guiding mechanism, it adjust to consist of more than one solid-fuelled each the solid-fuelled quantity delivered that supplies to described pulverizer; Concentration measuring mechanism, it measures carbon monoxide in the gas of outlet of described pulverizer and/or the concentration of carbon dioxide; Storing mechanism, it stores fixed carbon minute rate in described more than one the solid fuel and the ratio of volatile matter rate as assay value; Controlling organization, it is based on the measurement result of described concentration measuring mechanism and the described assay value of described storing mechanism storage, fixed carbon minute rate in described more than one the solid fuel that supplies to described pulverizer and the ratio of volatile matter rate are changed, so control described quantity delivered guiding mechanism.
According to above-mentioned formation, as above-mentioned, if the ratio of fixed carbon minute rate and volatile matter rate is uprised, so adjust and consist of more than one solid-fuelled each the solid-fuelled quantity delivered that supplies to pulverizer, more than one the solid-fuelled ignition temperature that then supplies to pulverizer uprises, in pulverizer, be difficult to occur the oxidation reaction as the fuel of omen on fire.
Therefore, carbon monoxide in the gas of the outlet of measurement pulverizer and/or the concentration of carbon dioxide, when consequently not detecting carbon monoxide and carbon dioxide, because the oxidation reaction as the fuel of omen on fire does not occur, so based on the assay value of trying to achieve in advance, make fixed carbon minute rate in the solid fuel and the ratio step-down of volatile matter rate, namely, make solid-fuelled ignition temperature step-down, so adjust and consist of more than one solid-fuelled each the solid-fuelled quantity delivered that supplies to pulverizer.Specifically, increase exactly the low side's of ignition temperature solid-fuelled quantity delivered, thereby reduce more than one solid-fuelled ignition temperature.Thus, the solid-fuelled quantity delivered that cheapness and ignition temperature are low increases, and therefore can 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 detecting a small amount of carbon monoxide and carbon dioxide, then the oxidation reaction as the fuel of omen on fire occurs, therefore based on the assay value of trying to achieve in advance, fixed carbon minute rate in the solid fuel and the ratio of volatile matter rate are uprised, namely, solid-fuelled ignition temperature is uprised, so adjust and consist of more than one solid-fuelled each the solid-fuelled quantity delivered that supplies to pulverizer.Specifically, reduce exactly the low side's of ignition temperature solid-fuelled quantity delivered, thereby improve more than one solid-fuelled ignition temperature.Thus, the solid-fuelled quantity delivered that cheapness and ignition temperature are low reduces, but in pulverizer, can not occur as the oxidation reaction of the fuel of omen on fire, in the gas of the outlet of pulverizer, can't detect carbon monoxide and carbon dioxide.Therefore, even use the low solid fuel of ignition temperature, also can prevent on fire in the pulverizer, prevent fire and the such disaster of blast of pulverizer.
In addition, in the on fire anti-locking apparatus of pulverizer of the present invention, described solid fuel can be at least a of coal and biomass fuel.According to above-mentioned formation, coal that can ignition temperature is low with cheapness and biomass fuel substitute high price and the fat coal of the high bituminous coal of ignition temperature etc., thereby can either prevent on fire in the pulverizer, can realize cost again.
Prevention method on fire and anti-locking apparatus on fire according to 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 only detecting a small amount of carbon monoxide and carbon dioxide, then based on assay value, fixed carbon minute rate in the solid fuel and the ratio of volatile matter rate are uprised, that is, solid-fuelled ignition temperature is uprised, so adjust and consist of more than one solid-fuelled each the solid-fuelled quantity delivered that supplies to pulverizer.Thus, in pulverizer, can not occur as the oxidation reaction of the fuel of omen on fire, therefore, even use the low solid fuel of ignition temperature, can prevent on fire in the pulverizer yet, prevent fire and the such disaster of blast of pulverizer.
Description of drawings
Fig. 1 is the skeleton diagram of the anti-locking apparatus on fire of expression pulverizer.
Fig. 2 is the skeleton diagram that the expression coal dust plays fire test device.
Fig. 3 is the figure of the relation of the ratio of expression fixed carbon minute rate and volatile matter rate and ignition temperature.
The specific embodiment
Below, Yi Bian with reference to accompanying drawing, Yi Bian preferred embodiment describe 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 anti-locking apparatus on fire 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, and its adjustment supplies to the coal A of mixer 4, the quantity delivered of B from coal bunker 1,2; Apparatus for measuring concentration (concentration measuring mechanism) 7, the carbonomonoxide concentration in the gas of the outlet of its measurement pulverizer 5; Arithmetic unit (storing mechanism, controlling organization) 11, it controls respectively coal regulating device for supply quantity 3a, 3b.Also have, apparatus for measuring concentration 7 also can be measured the gas concentration lwevel in the gas of outlet of pulverizer 5, also can measure respectively the concentration of carbon monoxide and carbon dioxide.
Pulverizer 5 is pulverized the mixed coal that is mixed by mixer 4 and is made it to become coal dust.The conveyance air (hot blast) of 5 supply conveyance coal dusts from air feeder 12 to pulverizer.By this conveyance air, while the coal dust in the pulverizer 5 is dried by conveyance to coal burner 8.At this, not on fire in order to make coal dust according to the measurement result of the ignition temperature of coal dust described later, the conveyance of the entrance of preferred pulverizer 5 is in below 200 ℃ with the temperature of air (hot blast).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 in pulverizer 5, use the low coal of ignition temperature, then in pulverizer 5, there is heated fuel (coal dust) danger on fire.So in pulverizer 5, if occur as the oxidation reaction of the fuel of omen on fire, then carbon monoxide and carbon dioxide occur, carbon monoxide will be detected by apparatus for measuring concentration 7.Therefore, in order to prevent on fire in the pulverizer 5, need to be in pulverizer 5, the oxidation reaction as the fuel of omen on fire is not occured, that is, and in the gas of the outlet of pulverizer 5, make carbon monoxide and and carbon dioxide be not detected.
Also have, if use the fat coal of the high bituminous coal of ignition temperature etc., then in the gas of the outlet of pulverizer 5, can't detect carbon monoxide and carbon dioxide.This be because, compare the conveyance that supplies to pulverizer 5 with the temperature of air (hot blast), it is much higher that fuel begins temperature one side of oxidation reaction.
In arithmetic unit 11, store in advance the coal proterties of the fixed carbon minute rate, volatile matter rate etc. of coal A and coal B 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, the composite rate that arithmetic unit 11 uses coal A, B is as usefulness, and measurement data and analysis data based on from apparatus for measuring concentration 7 change the fuel ratio of the mixed coal that supplies to pulverizer 5, control so respectively coal regulating device for supply quantity 3a, 3b.Thus, coal A, B are 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 because, fuel ratio is lower, low temperature and the volatile matter of imflammable gas etc. is more easily emitted, thereby easier to be on fire.Therefore, if fuel ratio is uprised, adjust so respectively and supply to the coal A of pulverizer 5, the quantity delivered of B, then the ignition temperature of coal dust uprises, and in pulverizer 5, will be difficult to occur as the oxidation reaction of the fuel of omen on fire.
But, improve merely fuel ratio, improve the ignition temperature of the mixed coal supply to pulverizer 5, can not increase cheapness and the quantity delivered of the low coal of ignition temperature.In order to realize cost, need in pulverizer 5, not occur under the degree on fire, increase as far as possible cheapness and the quantity delivered of the low coal of ignition temperature.
(work of the anti-locking apparatus on fire 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 describes.
From coal bunker 1,2 two kinds of coal A, B that supply with, mixed machine 4 mixes and is fed into pulverizer 5 as mixed coal.Supply to the quantity delivered of the coal A of mixer 4 from coal bunker 1, adjusted by coal regulating device for supply quantity 3a, supply 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 is become coal dust, by the conveyance air, while be dried by conveyance to coal burner 8.Coal dust is burnt by coal burner 8, and the heat that is 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, as the coal proterties of analyzing the pre-stored fixed carbon minute rate that coal A and coal B arranged of data (assay value), volatile matter rate etc., and store the fuel ratio of mixed coal as analysing data (assay value).The composite rate that arithmetic unit 11 uses coal A, B is as parameter, and measurement data and analysis data based on from apparatus for measuring concentration 7 change the fuel ratio of the mixed coal that supplies to pulverizer 5, control so respectively coal regulating device for supply quantity 3a, 3b.Thus, coal A, B change respectively to the quantity delivered of mixer 4.
Specifically, carbonomonoxide concentration in the gas of the outlet of measurement pulverizer 5, when its result does not detect carbon monoxide, oxidation reaction as the fuel of omen on fire does not occur, so arithmetic unit 11 is controlled respectively coal regulating device for supply quantity 3a, 3b based on the analysis data of trying to achieve in advance (relation of fuel ratio and ignition temperature), make the fuel ratio step-down of mixed coal, that is, make the ignition temperature step-down of mixed coal, adjust so respectively and supply to the coal A of pulverizer 5, the quantity delivered of B.Specifically, draw exactly the quantity delivered of the coal that adds the low side of ignition temperature, reduce the ignition temperature of mixed coal.Thus, because the quantity delivered of the low coal of cheapness and ignition temperature increases, so can realize cost.Also have, when not detecting carbon monoxide, also can not control coal regulating device for supply quantity 3a, 3b, the fuel ratio of mixed coal is changed.
On the other hand, carbonomonoxide concentration in the gas of the outlet of measurement pulverizer 5, its result is even when only detecting a small amount of carbon monoxide, then the oxidation reaction as the fuel of omen on fire occurs, so arithmetic unit 11 is controlled respectively coal regulating device for supply quantity 3a, 3b based on the analysis data of trying to achieve in advance, the fuel ratio of mixed coal is improved, that is, the ignition temperature of mixed coal is improved, adjust so respectively and supply to the coal A of pulverizer 5, the quantity delivered of B.Specifically, reduce exactly the quantity delivered of the low side's of ignition temperature coal, improve the ignition temperature of mixed coal.Thus, the quantity delivered of the coal that cheapness and ignition temperature are low reduces, but in pulverizer 5, can not occur as the oxidation reaction of the fuel of omen on fire, in the gas of the outlet of pulverizer 5, can't detect carbon monoxide.Therefore, even use the low coal of ignition temperature, also can prevent on fire in the pulverizer 5, prevent fire and the such disaster of blast of pulverizer 5.
In addition, as above-mentioned, also can use biomass fuel as solid fuel.And low coal and the biomass fuel of ignition temperature by using cheapness substitutes high price and the fat coal of the high bituminous coal of ignition temperature etc., can either prevent on fire in the pulverizer 5, can realize cost again.
Also have, also can be for the carbonomonoxide concentration setting threshold of apparatus for measuring concentration 7 measurements.Threshold value is exactly the carbonomonoxide concentration when pulverizer 5 fuels (coal dust) are on fire, is tens of ppm.So, during extremely near threshold value, the fuel ratio of mixed coal is uprised in the carbonomonoxide concentration of the measurement of apparatus for measuring concentration 7, that is, the ignition temperature of mixed coal is uprised, adjust respectively and supply to the coal A of pulverizer 5, the quantity delivered of B.In addition, carbonomonoxide concentration makes the fuel ratio step-down of mixed coal during fully away from threshold value,, makes the ignition temperature step-down of mixed coal that is, so adjusts respectively via mixer 4 and supplies to the coal A of pulverizer 5, the quantity delivered of B.Also have, when carbonomonoxide concentration threshold value fully far away, the fuel ratio of mixed coal is changed.
So, for the carbonomonoxide concentration setting threshold, carry out the control of coal regulating device for supply quantity 3a, 3b, can either prevent from fire in the pulverizer 5 from can fully using cheapness and the low coal of ignition temperature again, realize cost.
(relation of fuel ratio and ignition temperature)
Next, the relation for the fuel ratio in more than one the solid fuel and ignition temperature describes.In order to control respectively coal regulating device for supply quantity 3a, 3b, need arithmetic unit 11 to hold in advance fuel ratio in more than one the solid fuel.Therefore, use fuel ratio different three kinds of coal A, B, C one or more, investigation is with the ignition temperature of the coal dust of its pulverizing.In this investigation, use coal dust shown in Figure 2 to play fire test device 21.The coal proterties that shows three kinds of coal A, B, C in the table 1.
[table 1]
| Coal kind | Coal A | Coal B | Matchmaker's charcoal 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 |
| Not flammable 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 the cylinder of internal diameter φ 25mm * 700L; Quantitative coal dust is supplied to pulverized coal feeder 23 in the vertical reaction tube of cylinder 22; Be located at the heater 24 of the periphery of the vertical reaction tube 22 of cylinder; Gas supply line 25 to the heated mist of the vertical reaction tube 22 interior supplies 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 ℃, along vertically roughly heating up equably of 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 into about 5 ℃/min.
In addition, in the side of the vertical reaction tube 22 of cylinder, be provided with thermocouple jack along longitudinally at 8 places, in these thermocouple jacks, be inserted with respectively the armouring K thermocouple 28 of external diameter φ 1mm.By these armourings K thermocouple 28, can measure the atmosphere temperature on the central shaft of inside of the vertical reaction tube 22 of cylinder.
At this, in order under the condition identical with pulverizer 5, to test, and establish several experimental conditions.That is, as experimental condition, use the moisture containing ratio to be adjusted in advance the coal dust of 4.0～5.0% scope.In addition, as experimental condition, making particle diameter is that the ratio of the following coal dust of 75 μ m is more than 80%.In addition, as experimental condition, making Air/Coal is 1.7 than (supplying to the amount [L/min] of heated mist of the vertical reaction tube 22 of cylinder and the ratio of coal quantity delivered [g/min]).In addition, as experimental condition, the holdup time that coal dust is trapped in the vertical reaction tube 22 of cylinder is about 6 seconds.In addition, suppose coal dust particle with the speed identical with mist in the vertical reaction tube 22 interior movements of cylinder.In addition, suppose 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, in deadweight falls into the vertical reaction tube 22 of cylinder.In addition, heated mist is fed in the vertical reaction tube 22 of cylinder from gas supply line 25.In the vertical reaction tube 22 of cylinder, coal dust is heated to identical temperature with mist.Thereafter, coal dust is fallen outside the system from the flange part 22a of the bottom of the vertical reaction tube 22 of cylinder, accumulates in the receiving vessel 27.
If coal dust rises to coal dust temperature on fire in the holdup time in being stranded in the vertical reaction tube 22 of cylinder, the carbonomonoxide concentration meter 26 that then is arranged at the bottom of the vertical reaction tube 22 of cylinder detects the rising of carbonomonoxide concentration.The partial pressure of oxygen that supplies to the mist in the vertical reaction tube 22 of cylinder is changed, and utilize heater 24 that the atmosphere temperature in the vertical reaction tube 22 of cylinder is changed, carry out repeated test on one side, carbonomonoxide concentration in the gas of the outlet of the vertical reaction tube 22 of calculating cylinder reaches the above moment of 30ppm, the mean value of the atmosphere temperature in the vertical reaction tube 22 of cylinder is with this ignition temperature as coal dust.Also have, also can measure the gas concentration lwevel in the gas of outlet of the vertical reaction tube 22 of cylinder, thereby calculate the ignition temperature of coal dust.
Measurement result take the ratio (fuel ratio) of the fixed carbon minute rate of coal and volatile matter rate as the ignition temperature of the coal dust of parameter is presented among Fig. 3.According to the measurement result of the ignition temperature of coal dust as can be known, fuel ratio is lower, and the ignition temperature of coal dust reduces more linearly.This be considered to because, fuel ratio is lower, the volatile matter of imflammable gas etc. is more easily emitted under the low temperature, thereby easier to be on fire.Therefore, the fuel ratio of control in the solid fuel, the viewpoint on fire in pulverizer 5 is considered to make the operating condition of pulverizer 5 safety works.In addition, by the measurement result of the ignition temperature of coal dust as can be known, in order to prevent the on fire of coal dust, the conveyance of the entrance of pulverizer 5 is in below 200 ℃ with the temperature of air (hot blast).
(modified embodiment of the present embodiment)
Above, embodiments of the present invention are described, but the concrete example that has been illustration only, but not be particularly limited the present invention, the concrete design alterations that can suit such as formation.In addition, the described effect of working of an invention mode and effect, but be the effect of enumerating the best that is produced by the present invention, and effect of the present invention is not subjected to the described restriction of embodiments of the present invention.
For example, the coal regulating device for supply quantity 3a that is undertaken by arithmetic unit 11, the control of 3b are not subjected to above-mentioned restriction.Even apparatus for measuring concentration 7 does not detect carbonomonoxide concentration, fuel ratio in the solid fuel is uprised, namely, solid-fuelled ignition temperature is uprised, so adjust and consist of more than one solid-fuelled each the solid-fuelled quantity delivered that supplies to pulverizer 5, even 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 the solid fuel, namely, make solid-fuelled ignition temperature step-down, so adjust and consist of more than one solid-fuelled each the solid-fuelled quantity delivered that supplies to pulverizer 5.In a word, as long as in pulverizer 5, do not occur in the scope on fire, adjust more than one the solid-fuelled quantity delivered that supplies to pulverizer 5 and get final product.
The application is based on the Japanese patent application (patent application 2010-113447) of on May 17th, 2010 application, its content this with reference to and quote.
[utilizability on the industry]
The present invention is useful for the fire prevention of solid-fuelled pulverizer in the 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 cylinders
23 pulverized coal feeders
24 heaters
25 gas supply lines
26 carbonomonoxide concentration meters
27 receiving vessels
28 armouring K thermocouples
32 oxymeters
33 heaters
Claims (4)
1. the prevention method on fire of a pulverizer is characterized in that, is the prevention method on fire of the pulverizer of pulverized solid fuel, wherein,
Try to achieve in advance the assay value that is compared to of fixed carbon minute rate in more than one the solid fuel and volatile matter rate,
Measure carbon monoxide in the gas in exit of described pulverizer and/or the concentration of carbon dioxide,
Measurement result and described assay value based on described concentration, fixed carbon minute rate in described more than one the solid fuel that supplies to described pulverizer and the ratio of volatile matter rate are changed, so adjust and consist of described more than one solid-fuelled each the solid-fuelled quantity delivered that supplies 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 a in coal and the biomass fuel.
3. the on fire anti-locking apparatus of a pulverizer is characterized in that, is the on fire anti-locking apparatus of the pulverizer of pulverized solid fuel, and it has:
The quantity delivered guiding mechanism, it adjust to consist of more than one solid-fuelled each the solid-fuelled quantity delivered that supplies to described pulverizer;
Concentration measuring mechanism, it measures carbon monoxide in the gas in exit of described pulverizer and/or the concentration of carbon dioxide;
Storing mechanism, the fixed carbon minute rate in described more than one the solid fuel of its storage and volatile matter rate be compared to assay value,
Controlling organization, it is based on the measurement result of described concentration measuring mechanism and the described assay value of described storing mechanism storage, so that supply to the mode that the ratio of fixed carbon minute rate in described more than one the solid fuel of described pulverizer and volatile matter rate changes, control 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 a in coal and the 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 true CN102893090A (en) | 2013-01-23 |
| CN102893090B 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) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104048308A (en) * | 2013-03-15 | 2014-09-17 | 阿尔斯通技术有限公司 | System and method for low load operation of coal mill |
Families Citing this family (1)
| 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 |
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|---|---|---|---|---|
| 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 |
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| 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 WO PCT/JP2011/060785 patent/WO2011145483A1/en active Application Filing
- 2011-05-10 CN CN201180024011.8A patent/CN102893090B/en not_active Expired - Fee Related
- 2011-05-10 KR KR1020127030110A patent/KR101397885B1/en active IP Right Grant
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 |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104048308A (en) * | 2013-03-15 | 2014-09-17 | 阿尔斯通技术有限公司 | System and method for low load operation of coal mill |
| US9746179B2 (en) | 2013-03-15 | 2017-08-29 | General Electric Technology Gmbh | System and method for low load operation of coal mill |
Also Published As
| Publication number | Publication date |
|---|---|
| JP5385851B2 (en) | 2014-01-08 |
| KR20130009850A (en) | 2013-01-23 |
| KR101397885B1 (en) | 2014-05-20 |
| WO2011145483A1 (en) | 2011-11-24 |
| CN102893090B (en) | 2015-04-15 |
| JP2011242032A (en) | 2011-12-01 |
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