CN102893089A - Method for preventing ignition in mill and device for preventing ignition in mill - Google Patents
Method for preventing ignition in mill and device for preventing ignition in mill Download PDFInfo
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- CN102893089A CN102893089A CN2011800240071A CN201180024007A CN102893089A CN 102893089 A CN102893089 A CN 102893089A CN 2011800240071 A CN2011800240071 A CN 2011800240071A CN 201180024007 A CN201180024007 A CN 201180024007A CN 102893089 A CN102893089 A CN 102893089A
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- pulverizer
- coal
- containing ratio
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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
- B02C13/00—Disintegrating by mills having rotary beater elements ; Hammer mills
- B02C13/13—Disintegrating by mills having rotary beater elements ; Hammer mills with horizontal rotor shaft and combined with sifting devices, e.g. for making powdered 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
- B02C13/00—Disintegrating by mills having rotary beater elements ; Hammer mills
- B02C13/26—Details
- B02C13/31—Safety devices or measures
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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
- F23K2201/1003—Processes to make pulverulent fuels
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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
- F23K2201/1006—Mills adapted for use with furnaces
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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
- F23K2201/50—Blending
- F23K2201/501—Blending with other fuels or combustible waste
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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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- 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
- F23K2203/104—Metering 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
A mill (5) for milling a solid fuel, which comprises: feed rate-adjusting means (3a, 3b) for adjusting the feed rate of the solid fuel; a concentration-measuring means (7) for measuring the carbon monoxide and/or carbon dioxide concentration(s) at the outlet of the mill (5); and a memory means (11) for storing, as an analytical value, the ratio of the oxygen content and/or hydrogen content of the solid fuel to the carbon content thereof, wherein the feed rate-adjusting means (3a, 3b) are controlled by a controlling means (11), based on the result of the measurement by the concentration-measuring means (7) and the analytical value, so as to vary the ratio of the oxygen content and/or hydrogen content of the solid fuel fed to the mill (5) to the carbon content thereof, said ratio being in the same type as the analytical value. According to the aforesaid structure, ignition in the mill (5) can be prevented.
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 the oxygen containing ratio in each solid fuel and/or hydrogen containing ratio and carbon containing ratio 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, make in the ratio of oxygen containing ratio in described each solid fuel that supplies to described pulverizer and/or hydrogen containing ratio and carbon containing ratio, congener than changing with described assay value, so adjust described 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 oxygen containing ratio in each solid fuel and/or hydrogen containing ratio are higher with the ratio of carbon containing ratio, and the ignition temperature of solid-fuelled mixture (composite solid fuel) more reduces.This be considered to because, oxygen containing ratio and/or hydrogen containing ratio are higher with the ratio of carbon containing ratio, the volatile matter of imflammable gas etc. is more easily emitted at low temperatures, thereby easier to be on fire.Therefore, if make the ratio step-down of oxygen containing ratio and/or hydrogen containing ratio and carbon containing ratio, so adjust each the solid-fuelled quantity delivered that supplies to pulverizer, the ignition temperature that then supplies to the composite solid fuel of pulverizer uprises, in pulverizer, will be difficult to occur as the oxidation reaction of the fuel of omen on fire.
But, merely reduce the ratio of oxygen containing ratio and/or hydrogen containing ratio and carbon containing ratio, improve 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 much as possible.
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 in the ratio of oxygen containing ratio in the solid fuel and/or hydrogen containing ratio and carbon containing ratio, uprise with the congener ratio of assay value, namely make solid-fuelled ignition temperature step-down, so adjust 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 the ignition temperature of composite solid fuel.Thus, because the low solid-fuelled quantity delivered of cheapness and ignition temperature increases, so 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 in the ratio of oxygen containing ratio in the solid fuel and/or hydrogen containing ratio and carbon containing ratio, with the congener step-down that compares of assay value, solid-fuelled ignition temperature is uprised, so adjust 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 the ignition temperature of composite solid fuel.Thus, the solid-fuelled quantity delivered that cheapness and ignition temperature are low reduces, and 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 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 is the on fire anti-locking apparatus of the pulverizer of pulverized solid fuel, it is characterized in that having following mechanism: quantity delivered guiding mechanism, its adjustment supply to each solid-fuelled quantity delivered of 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, its assay value that is compared to the oxygen containing ratio in described each solid fuel and/or hydrogen containing ratio and carbon containing ratio is stored; Controlling organization, it is based on the measurement result of described concentration measuring mechanism and the described assay value of described storing mechanism storage, make in the ratio of oxygen containing ratio in described each solid fuel that supplies to described pulverizer and/or hydrogen containing ratio and carbon containing ratio, congener than changing with described assay value, so control described quantity delivered guiding mechanism.
According to above-mentioned formation, as above-mentioned, if make the ratio step-down of oxygen containing ratio and/or hydrogen containing ratio and carbon containing ratio, so adjust each the solid-fuelled quantity delivered that supplies to pulverizer, the ignition temperature that then supplies to the composite solid fuel of pulverizer uprises, in pulverizer, will be difficult to occur as the oxidation reaction of 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 in the ratio of oxygen containing ratio in the solid fuel and/or hydrogen containing ratio and carbon containing ratio, uprise with the congener ratio of assay value, make in other words solid-fuelled ignition temperature step-down, so adjust 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 the ignition temperature of composite solid fuel.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 little 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 in the ratio as the oxygen containing ratio in the solid fuel and/or hydrogen containing ratio and carbon containing ratio, with the congener step-down that compares of assay value, solid-fuelled ignition temperature is uprised, so adjust each the solid-fuelled quantity delivered that supplies to pulverizer.Specifically, reduce exactly the low side's of ignition temperature solid-fuelled quantity delivered, improve the ignition temperature of composite solid fuel.Thus, the solid-fuelled quantity delivered that cheapness and ignition temperature are low reduces, and 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 also can be at least a of coal and biomass fuel.According to above-mentioned formation, 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 little a small amount of carbon monoxide and carbon dioxide, then based on assay value, make in the ratio of oxygen containing ratio in the solid fuel and/or hydrogen containing ratio and carbon containing ratio, with the congener step-down that compares of assay value, solid-fuelled ignition temperature is uprised, so adjust each the solid-fuelled quantity delivered that supplies to pulverizer.Thus, in pulverizer, because can not occur as the oxidation reaction of the fuel of omen on fire, so even use the low solid fuel of ignition temperature, also can prevent the on fire of In in the pulverizer, 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 mol ratio of expression oxygen containing ratio and carbon containing ratio and ignition temperature.
Fig. 4 is the figure of the relation of the mol ratio of expression hydrogen containing ratio and carbon containing ratio and ignition temperature.
Fig. 5 is the figure of the relation of the mol ratio of expression oxygen containing ratio and hydrogen containing ratio and carbon containing ratio 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 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.Supply with the conveyance air (hot blast) of conveyance coal dust to pulverizer 5.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, the coal proterties of the pre-stored oxygen containing ratio that coal A and coal B arranged, hydrogen containing ratio, carbon containing ratio etc. is as analyzing data (assay value), and stores the O/C 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 parameter, and measurement data and analysis data based on from apparatus for measuring concentration 7 make the O/C of the mixed coal that supplies to pulverizer 5 than changing, and 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.Also have, also the H/C of mixed coal can be compared to analysis data (assay value) pre-stored in arithmetic unit 11, arithmetic unit 11 uses the composite rate of coal A, B as parameter, based on measurement data and the analysis data from apparatus for measuring concentration 7, make the H/C of the mixed coal that supplies to pulverizer 5 than changing, control so respectively coal regulating device for supply quantity 3a, 3b.In addition, also can use (O+H)/C recently to substitute O/C ratio and H/C ratio.
At this, the O/C of mixed coal (coal dust) is than higher, and the ignition temperature of mixed coal (coal dust) more reduces.This be considered to because, O/C is than higher, the volatile matter of imflammable gas etc. is more easily emitted under the low temperature, and is easier to be on fire.Therefore, if make O/C than step-down, 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.About H/C than and (O+H)/C is than too.
But, reduce merely O/C ratio, H/C ratio, (O+H)/C 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, can 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, the coal proterties of the pre-stored oxygen containing ratio that coal A and coal B arranged, hydrogen containing ratio carbon containing ratio etc. is as analyzing data (assay value), and as analyzing data (assay value) and storing the O/C ratio.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 make the O/C of the mixed coal that supplies to pulverizer 5 than changing, and 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.
Specifically, carbonomonoxide concentration in the gas of the outlet of measurement pulverizer 5, when its result does not detect carbon monoxide, because the 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 (O/C ratio), the O/C ratio of mixed coal is uprised, 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, the quantity delivered of the coal by increasing the low side of ignition temperature reduces the ignition temperature of mixed coal.Thus, the quantity delivered of the coal that cheapness and ignition temperature are low increases, and therefore can realize cost.Also have, when not detecting carbon monoxide, also can not control coal regulating device for supply quantity 3a, 3b, make the O/C of mixed coal than not changing.
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, because the oxidation reaction as the fuel of omen on fire occurs, so arithmetic unit 11 based on the analysis data of trying to achieve in advance, is controlled respectively coal regulating device for supply quantity 3a, 3b, make the O/C of mixed coal compare step-down, that is, the ignition temperature of mixed coal is uprised, so come to adjust respectively the coal A that supplies to 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, and in pulverizer 5, does 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.Also have, also can use H/C than and/or (O+H)/C is than replacing the O/C ratio.
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 the carbonomonoxide concentration when pulverizer 5 fuels (coal dust) are on fire, is tens of ppm.Then, when the carbonomonoxide concentration that apparatus for measuring concentration 7 is measured is fully approached threshold value, make the O/C of mixed coal than step-down, that is, the ignition temperature of mixed coal is uprised, adjust so respectively and supply to the coal A of pulverizer 5, the quantity delivered of B.In addition, carbonomonoxide concentration uprises the O/C ratio 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, carbonomonoxide concentration also can make the O/C of mixed coal than changing during fully away from threshold value.
So, for the carbonomonoxide concentration setting threshold, carry out the control of coal regulating device for supply quantity 3a, 3b, also can both prevent on fire in the pulverizer 5, can use cheapness fully again and the low coal of ignition temperature can be realized cost.
(O/C ratio, H/C than and (O+H)/C than with the relation of ignition temperature)
Next, for the ratio of the O/C in each solid fuel, H/C than and (O+H)/C describes than the relation with ignition temperature.In order to control respectively coal regulating device for supply quantity 3a, 3b, need arithmetic unit 11 hold in advance O/C ratio in each solid fuel, H/C than and (O+H)/C than with the relation of ignition temperature.Therefore, use O/C ratio, H/C than and (O+H)/C than different three kinds of coal A, B, C one or more, investigation has been carried out the ignition temperature of the coal dust pulverized with it.Use coal dust shown in Figure 2 to play fire test device 21 in this investigation.The coal proterties that shows three kinds of coal A, B, C in the 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 |
| 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 |
| The O/C ratio | 0.093 | 0.120 | 0.206 |
| 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 mol ratio (O/C ratio) of oxygen containing ratio and the carbon containing ratio of coal as the ignition temperature of the coal dust of parameter is presented among Fig. 3.In addition, the measurement result take the mol ratio (H/C ratio) of hydrogen containing ratio and the carbon containing ratio of coal as the ignition temperature of the coal dust of parameter is presented among Fig. 4.In addition, the measurement result take the mol ratio ((O+H)/C ratio) of oxygen containing ratio and hydrogen containing ratio and the carbon containing ratio of coal as the ignition temperature of the coal dust of parameter is presented among Fig. 5.According to the measurement result of the ignition temperature of coal dust as can be known, O/C ratio, H/C ratio, (O+H)/C are than higher, and the ignition temperature of coal dust reduces more linearly.This be considered to because, O/C ratio, H/C ratio, (O+H)/C be than higher, the volatile matter of imflammable gas etc. is more easily emitted under the low temperature, thereby easier to be on fire.Therefore, O/C ratio, H/C ratio, (the O+H)/C 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, also can make the O/C in the solid fuel compare step-down, that is, solid-fuelled ignition temperature is uprised, so adjust 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, the O/C ratio in the solid fuel is uprised, namely, make solid-fuelled ignition temperature step-down, so adjust 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 each the solid-fuelled quantity delivered that supplies to pulverizer 5 and get final product.About H/C than and (O+H)/C is than too.
In detail and with reference to specific embodiment the present invention has been described, but can broken away from the spirit and scope of the present invention and in addition various changes and correction, this is concerning should be clear from the person that has come.
The application is based on the Japanese patent application (patent application 2010-114451) of on May 18th, 2010 application, its content this with reference to and quote.
[utilizability on the industry]
The present invention is useful for the fire prevention of the solid-fuelled pulverizer of 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 oxygen containing ratio in each solid fuel and/or hydrogen containing ratio and carbon containing ratio,
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, make oxygen containing ratio and/or hydrogen containing ratio in described each solid fuel that supplies to described pulverizer namely congener than changing with described assay value with the ratio of carbon containing ratio, so adjust described 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:
Quantity delivered guiding mechanism, its adjustment supply to each solid-fuelled quantity delivered of 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, its storage in described each solid fuel the oxygen containing ratio and/or hydrogen containing ratio and carbon containing ratio 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 the ratio that supplies to oxygen containing ratio in described each solid fuel of described pulverizer and/or hydrogen containing ratio and carbon containing ratio namely with the congener mode than changing of described assay value, 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 |
|---|---|---|---|
| JP2010-114451 | 2010-05-18 | ||
| JP2010114451A JP5385853B2 (en) | 2010-05-18 | 2010-05-18 | Crusher ignition prevention method and ignition prevention device |
| PCT/JP2011/060827 WO2011145493A1 (en) | 2010-05-18 | 2011-05-11 | Method for preventing ignition in mill and device for preventing ignition in mill |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102893089A true CN102893089A (en) | 2013-01-23 |
| CN102893089B CN102893089B (en) | 2015-09-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201180024007.1A Expired - Fee Related CN102893089B (en) | 2010-05-18 | 2011-05-11 | The prevention method on fire of pulverizer and anti-locking apparatus on fire |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP5385853B2 (en) |
| KR (1) | KR101369705B1 (en) |
| CN (1) | CN102893089B (en) |
| WO (1) | WO2011145493A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20160116205A (en) | 2015-03-27 | 2016-10-07 | 고등기술연구원연구조합 | Syngas Treatment System and Method |
| JP7086535B2 (en) * | 2017-06-20 | 2022-06-20 | 三菱重工業株式会社 | Control method of solid fuel crusher and solid fuel crusher |
| CN113441268B (en) * | 2021-06-04 | 2022-11-01 | 华能(浙江)能源开发有限公司玉环分公司 | Explosion-proof method for grinding high-volatile coal by coal mill |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2207225Y (en) * | 1994-08-01 | 1995-09-13 | 林协中 | Explosion-proof dustless universal pulverizer |
| 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 |
| JP2000028129A (en) * | 1998-07-08 | 2000-01-25 | Mitsubishi Heavy Ind Ltd | Pulverized coal combustor |
| JP2004347241A (en) * | 2003-05-22 | 2004-12-09 | Mitsubishi Heavy Ind Ltd | Coal-organic matter fuel mixture grinding device |
-
2010
- 2010-05-18 JP JP2010114451A patent/JP5385853B2/en active Active
-
2011
- 2011-05-11 WO PCT/JP2011/060827 patent/WO2011145493A1/en active Application Filing
- 2011-05-11 CN CN201180024007.1A patent/CN102893089B/en not_active Expired - Fee Related
- 2011-05-11 KR KR1020127030113A patent/KR101369705B1/en active IP Right Grant
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2207225Y (en) * | 1994-08-01 | 1995-09-13 | 林协中 | Explosion-proof dustless universal pulverizer |
| 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 |
| JP2000028129A (en) * | 1998-07-08 | 2000-01-25 | Mitsubishi Heavy Ind Ltd | Pulverized coal combustor |
| JP2004347241A (en) * | 2003-05-22 | 2004-12-09 | Mitsubishi Heavy Ind Ltd | Coal-organic matter fuel mixture grinding device |
Also Published As
| Publication number | Publication date |
|---|---|
| KR20130018888A (en) | 2013-02-25 |
| JP5385853B2 (en) | 2014-01-08 |
| JP2011240250A (en) | 2011-12-01 |
| WO2011145493A1 (en) | 2011-11-24 |
| CN102893089B (en) | 2015-09-09 |
| KR101369705B1 (en) | 2014-03-03 |
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