CN102893089B - The prevention method on fire of pulverizer and anti-locking apparatus on fire - Google Patents
The prevention method on fire of pulverizer and anti-locking apparatus on fire Download PDFInfo
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- CN102893089B CN102893089B CN201180024007.1A CN201180024007A CN102893089B CN 102893089 B CN102893089 B CN 102893089B CN 201180024007 A CN201180024007 A CN 201180024007A CN 102893089 B CN102893089 B CN 102893089B
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- containing ratio
- pulverizer
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- fire
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Classifications
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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
- F23K1/00—Preparation of lump or pulverulent fuel in readiness for delivery to combustion apparatus
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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
- F23K2201/00—Pretreatment of solid fuel
- F23K2201/10—Pulverizing
- F23K2201/1003—Processes to make pulverulent fuels
-
- 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
-
- 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
-
- 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
Abstract
The on fire anti-locking apparatus of pulverizer of the present invention has: quantity delivered guiding mechanism (3a, 3b), and it adjusts solid-fuelled quantity delivered; Concentration measuring mechanism (7), it measures the carbon monoxide of outlet and/or the concentration of carbon dioxide of described pulverizer (5); Storing mechanism (11), oxygen containing ratio in its storage solid fuel and/or the ratio of hydrogen containing ratio and carbon containing ratio are as assay value, in the pulverizer (5) of pulverized solid fuel, based on measurement result and the assay value of concentration measuring mechanism (7), by controlling organization (11), to make to be supplied to the ratio of oxygen containing ratio in the solid fuel of described pulverizer (5) and/or hydrogen containing ratio and carbon containing ratio, namely the congener mode than changing controls quantity delivered guiding mechanism (3a, 3b) with assay value.According to this formation, what can prevent in pulverizer (5) is on fire.
Description
Technical field
The present invention relates to the prevention method on fire and anti-locking apparatus on fire pulverized as the solid-fuelled pulverizer of boiler oil.
Background technology
Using solid fuel as in the boiler of fuel, the solid fuel pulverized by pulverizer is supplied to together with conveyance air.
In Japan, because bituminous coal high for ignition temperature to be used for the fuel of boiler, so not too receive publicity for the on fire of pulverizer.Though in pulverized coal firing boiler in the early stage, as the countermeasure after breaking out of fire, in pulverizer, be provided with system and the fracture plate (rupture disk) of supply inert gas (steam etc.).
On the other hand, abroad, in the 1980's, owing to using the western colm produced, there are many breaking out of fires in pulverizer in the particularly U.S., the experience and lessons of blast.From now on, Japan will use colm, the coal that namely ignition temperature is low and ub-bituminous coal, and the chance of upgrading brown coal (UBC) etc. also can increase, and what therefore need to detect in advance in pulverizer is on fire, and is prevented it.
In patent document 1, disclose a kind of coal/organic matter fuel mix reducing mechanism, it is in coal supply pipe coal being supplied to the grater pulverizing coal, supply living beings (biomass) quantitatively, thus the ratio stabilisation of the coal amount making to be supplied in grater and biomass fuel doses, prevent the on fire of living beings, and then make the operating condition stabilisation of grater.
In addition, in patent document 2, disclose a kind of device and be equipped with this device coal-burning boiler equipment, this device is by comparing mixing air at grinding mill inlet temperature measurement value and grinding mill inlet temperature set point, when grinding mill inlet temperature measurement value reaches more than grinding mill inlet temperature set point, reduce grinding mill outlet temperature setting value, thus prevent the fire accident that the excessive rising because of grinding mill inlet temperature causes, while proceed the control of grinding mill outlet temperature.
In addition, in patent document 3, publicly-owned a kind of roller mill device, it is according to the inlet temperature being controlled grinding mill by the quantity delivered of crushed material, reduces the change of the outlet temperature of grinding mill, prevents the on fire of coal dust.
In addition, in patent document 4, disclose a kind of coal pulverizer air temperature control device, it is by measuring the temperature added in warm-air pipe and coal pulverizer, control the temperature and the quantity delivered that are supplied to the air of coal pulverizer, thus stop possibility on fire.
In addition, in patent document 5, disclose and a kind ofly prevent grinding mill outlet temperature control method on fire, it tries to achieve raw coal moisture by grinding mill inlet temperature with to the coal-supplying amount of grinding mill, according to this raw coal moisture, setting grinding mill outlet temperature, thus make grinding mill outlet temperature become the optimum value corresponding with raw coal moisture and prevent on fire.
In addition, in patent document 6, disclose a kind of coal dust combustion method preventing micro mist from exploding, its be detect in micro mist hopper coal dust glow and naked light fired state time, the conveyance medium of coal dust is replaced to inert gas from air, explodes to prevent micro mist.
[look-ahead technique document]
[patent document]
[patent document 1] Japanese Unexamined Patent Publication 2004-347241 publication
[patent document 2] Japanese Unexamined Patent Publication 2006-102666 publication
[patent document 3] Japanese Unexamined Patent Publication 4-244246 publication
[patent document 4] Japanese Laid-Open Patent Publication 56-152750 publication
[patent document 5] Japanese Laid-Open Patent Publication 63-315158 publication
[patent document 6] Japanese Laid-Open Patent Publication 63-267814 publication
But under present situation, also there is no a kind of solid-fuelled running index low for the ignition temperature not yet envisioned up to now.Therefore, not knowing should with which type of operating condition, and specifically, not knowing exactly should with what kind of inlet/outlet temperature and fuel feed operate crusher.Therefore, expect to obtain the operating condition for safe handling pulverizer, what prevent in pulverizer is on fire.
Summary of the invention
The object of the invention is to, a kind of prevention method on fire of the pulverizer on fire that can prevent in pulverizer and anti-locking apparatus on fire are provided.
The prevention method on fire of pulverizer of the present invention, it is the prevention method on fire of the pulverizer of pulverized solid fuel, it is characterized in that, the ratio of the oxygen containing ratio in each solid fuel and/or hydrogen containing ratio and carbon containing ratio is tried to achieve in advance as assay value, measure the concentration of carbon monoxide in the gas of the outlet of described pulverizer and/or carbon dioxide, based on measurement result and the described assay value of described concentration, make to be supplied in the ratio of oxygen containing ratio in described each solid fuel of described pulverizer and/or hydrogen containing ratio and carbon containing ratio, congener than changing with described assay value, adjustment like this is supplied to described each solid-fuelled quantity delivered of described pulverizer.
In the past, if supply hot blast (conveyance air), while the solid fuel using ignition temperature low in pulverized solid fuel pulverizer, then in pulverizer, be there is danger on fire by the fuel heated.And, in pulverizer, if there is the oxidation reaction as the fuel of omen on fire, then, in the gas of the outlet of pulverizer, carbon monoxide and carbon dioxide can be detected.Therefore, in order to prevent pulverize on fire, in pulverizer, need the oxidation reaction of the fuel as omen on fire is not occurred, that is, need in the outlet of pulverizer in gas, do not make carbon monoxide and carbon dioxide be detected.
At this, the ratio of the oxygen containing ratio in each solid fuel and/or hydrogen containing ratio and carbon containing ratio is higher, and the ignition temperature of solid-fuelled mixture (composite solid fuel) more reduces.This be considered to due to, the ratio of oxygen containing ratio and/or hydrogen containing ratio and carbon containing ratio is higher, and the volatile matter of imflammable gas etc. is more easily released at low temperatures, thus more on fire.Therefore, if make the ratio step-down of oxygen containing ratio and/or hydrogen containing ratio and carbon containing ratio, adjustment like this is supplied to each solid-fuelled quantity delivered of pulverizer, the ignition temperature being then supplied to the composite solid fuel of pulverizer uprises, in pulverizer, the oxidation reaction as the fuel of omen on fire will be difficult to occur.
But, merely reduce the ratio of oxygen containing ratio and/or hydrogen containing ratio and carbon containing ratio, improve the solid-fuelled ignition temperature being supplied to pulverizer, cheapness and the low solid-fuelled quantity delivered of ignition temperature can not be increased.Reducing to realize cost, under needing, in pulverizer, degree on fire does not occur, increasing cheap and ignition temperature is low solid-fuelled quantity delivered as much as possible.
Therefore, carbon monoxide in the gas of the outlet of measurement pulverizer and/or the concentration of carbon dioxide, when carbon monoxide and carbon dioxide consequently not detected, because do not occur as the oxidation reaction of the fuel of omen on fire, so based on the assay value of trying to achieve in advance, make in the ratio of oxygen containing ratio in 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 adjustment is supplied to each solid-fuelled quantity delivered of pulverizer.Specifically, be exactly the solid-fuelled quantity delivered increasing the low side of ignition temperature, thus reduce the ignition temperature of composite solid fuel.Thus, because of cheap, ignition temperature is low solid-fuelled quantity delivered increases, and reduces 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 a small amount of carbon monoxide and carbon dioxide only being detected, oxidation reaction then as the fuel of omen on fire occurs, therefore based on the assay value of trying to achieve in advance, make in the ratio of oxygen containing ratio in solid fuel and/or hydrogen containing ratio and carbon containing ratio, step-down is compared with assay value is congener, namely make solid-fuelled ignition temperature uprise, so adjustment is supplied to each solid-fuelled quantity delivered of pulverizer.Specifically, be exactly the solid-fuelled quantity delivered reducing the low side of ignition temperature, thus improve the ignition temperature of composite solid fuel.Thus, the solid-fuelled quantity delivered that cheap and ignition temperature is low reduces, and in pulverizer, the oxidation reaction as the fuel of omen on fire can not occur, and in the gas of the outlet of pulverizer, can't detect carbon monoxide and carbon dioxide.Therefore, even if use the low solid fuel of ignition temperature, what also can prevent in pulverizer is on fire, prevents the fire of pulverizer and the such disaster of blast.
In addition, in the prevention method on fire of pulverizer of the present invention, described solid fuel can be at least one of coal and biomass fuel.According to above-mentioned formation, cheapness and the low coal of ignition temperature and biomass fuel can be used to substitute the fat coal of high price and the high bituminous coal of ignition temperature etc., thus it is on fire to prevent in pulverizer, can realize again cost and reduce.
In addition, the on fire anti-locking apparatus of pulverizer of the present invention, is the on fire anti-locking apparatus of the pulverizer of pulverized solid fuel, it is characterized in that, have following mechanism: quantity delivered guiding mechanism, and its adjustment is supplied to each solid-fuelled quantity delivered of described pulverizer; Concentration measuring mechanism, it measures the concentration of carbon monoxide in the gas of the outlet of described pulverizer and/or carbon dioxide; Storing mechanism, the ratio of the oxygen containing ratio in described each solid fuel and/or hydrogen containing ratio and carbon containing ratio is stored as assay value by it; Controlling organization, the described assay value that its measurement result based on described concentration measuring mechanism and described storing mechanism store, make to be supplied in the ratio of oxygen containing ratio in described each solid fuel of 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, adjustment like this is supplied to each solid-fuelled quantity delivered of pulverizer, the ignition temperature being then supplied to the composite solid fuel of pulverizer uprises, in pulverizer, the oxidation reaction as the fuel of omen on fire will be difficult to occur.
Therefore, carbon monoxide in the gas of the outlet of measurement pulverizer and/or the concentration of carbon dioxide, when carbon monoxide and carbon dioxide consequently not detected, because do not occur as the oxidation reaction of the fuel of omen on fire, so based on the assay value of trying to achieve in advance, make in the ratio of oxygen containing ratio in solid fuel and/or hydrogen containing ratio and carbon containing ratio, uprise with the congener ratio of assay value, in other words make solid-fuelled ignition temperature step-down, so adjustment is supplied to each solid-fuelled quantity delivered of pulverizer.Specifically, be exactly the solid-fuelled quantity delivered increasing the low side of ignition temperature, thus reduce the ignition temperature of composite solid fuel.Thus, the solid-fuelled quantity delivered that cheap and ignition temperature is low increases, and reduces therefore, it is possible to realize cost.
On the other hand, carbon monoxide in the gas of the outlet of measurement pulverizer and/or the concentration of carbon dioxide, its result is even when a small amount of carbon monoxide and carbon dioxide only being detected a little, oxidation reaction then 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 solid fuel and/or hydrogen containing ratio and carbon containing ratio, step-down is compared with assay value is congener, namely make solid-fuelled ignition temperature uprise, so adjustment is supplied to each solid-fuelled quantity delivered of pulverizer.Specifically, be exactly the solid-fuelled quantity delivered reducing the low side of ignition temperature, improve the ignition temperature of composite solid fuel.Thus, the solid-fuelled quantity delivered that cheap and ignition temperature is low reduces, and in pulverizer, the oxidation reaction as the fuel of omen on fire can not occur, and in the gas of the outlet of pulverizer, can't detect carbon monoxide and carbon dioxide.Therefore, even if use the low solid fuel of ignition temperature, what also can prevent in pulverizer is on fire, prevents the fire of pulverizer and the such disaster of blast.
In addition, in the on fire anti-locking apparatus of pulverizer of the present invention, described solid fuel also can be at least one of coal and biomass fuel.According to above-mentioned formation, according to above-mentioned formation, cheapness and the low coal of ignition temperature and biomass fuel can be used to substitute the fat coal of high price and the high bituminous coal of ignition temperature etc., thus it is on fire to prevent in pulverizer, can realize again cost and reduce.
According to prevention method on fire and the anti-locking apparatus on fire of pulverizer of the present invention, carbon monoxide in the gas of the outlet of measurement pulverizer and/or the concentration of carbon dioxide, its result is even when a small amount of carbon monoxide and carbon dioxide only being detected a little, then based on assay value, make in the ratio of oxygen containing ratio in solid fuel and/or hydrogen containing ratio and carbon containing ratio, step-down is compared with assay value is congener, namely make solid-fuelled ignition temperature uprise, so adjustment is supplied to each solid-fuelled quantity delivered of pulverizer.Thus, in pulverizer, because can not occur as the oxidation reaction of the fuel of omen on fire, even if so use the low solid fuel of ignition temperature, also can prevent the on fire of In in pulverizer, prevent the fire of pulverizer and the such disaster of blast.
Accompanying drawing explanation
Fig. 1 is the skeleton diagram of the on fire anti-locking apparatus representing pulverizer.
Fig. 2 represents that coal dust plays the skeleton diagram of fire test device.
Fig. 3 is the figure representing the mol ratio of oxygen containing ratio and carbon containing ratio and the relation of ignition temperature.
Fig. 4 is the figure representing the mol ratio of hydrogen containing ratio and carbon containing ratio and the relation of ignition temperature.
Fig. 5 is the figure representing the mol ratio of oxygen containing ratio and hydrogen containing ratio and carbon containing ratio and the relation of ignition temperature.
Detailed description of the invention
Below, with reference to accompanying drawing, while be preferred embodiment described for of the present invention.Also have, in the following embodiments, use coal to be illustrated as solid fuel, but solid fuel is not limited thereto, also can be biomass fuel and mud carbide etc., also can use the two or more of coal, biomass fuel, mud carbide etc.
(formation of the on fire anti-locking apparatus of pulverizer)
The on fire anti-locking apparatus 10 of the pulverizer of present embodiment, as shown in Figure 1, has as follows: coal regulating device for supply quantity (quantity delivered guiding mechanism) 3a, 3b, and its adjustment is supplied to the quantity delivered of coal A, B of mixer 4 from coal bunker 1,2; Apparatus for measuring concentration (concentration measuring mechanism) 7, it measures the carbonomonoxide concentration in the gas of the outlet of pulverizer 5; Arithmetic unit (storing mechanism, controlling organization) 11, it controls coal regulating device for supply quantity 3a, 3b respectively.Further, apparatus for measuring concentration 7 can measure the gas concentration lwevel in the gas of the outlet of pulverizer 5, also can measure the concentration of carbon monoxide and carbon dioxide respectively.
Coal bunker 1,2 keeps two kinds of coals A, B respectively.The coal A that coal bunker 1 keeps, with the coal B that coal bunker 2 keeps, the mol ratio (O/C ratio) of oxygen containing ratio and carbon containing ratio is different, and the mol ratio of hydrogen containing ratio and carbon containing ratio (H/C ratio), and the mol ratio of oxygen containing ratio and hydrogen containing ratio and carbon containing ratio ((O+H)/C ratio) is different.Mixer 4 mixes two kinds of coals A, B supplying from coal bunker 1,2.Be supplied to the quantity delivered of the coal A of mixer 4 from coal bunker 1, adjusted by coal regulating device for supply quantity 3a, be supplied to the quantity delivered of the coal B of mixer 4 from coal bunker 2, adjusted by coal regulating device for supply quantity 3b.
Pulverizer 5 is pulverized the mixed coal that mixed by mixer 4 and is made it to become coal dust.The conveyance of conveyance coal dust is supplied with air (hot blast) to pulverizer 5.By this conveyance air, the coal dust in pulverizer 5 is dried while be transported to coal burner 8.At this, according to the measurement result of the ignition temperature of coal dust described later, in order to make coal dust not on fire, the temperature of the conveyance air (hot blast) of the entrance of preferred pulverizer 5 is in less than 200 DEG C.Carbonomonoxide concentration in the gas of the outlet of pulverizer 5, is measured by apparatus for measuring concentration 7.Coal burner 8 makes coal dust firing.Boiler 9 makes coal dust firing and reclaims heat.
At this, if the coal using ignition temperature low in pulverizer 5, then in pulverizer 5, exist by the fuel (coal dust) that heats danger on fire.So in pulverizer 5, if occurred as the oxidation reaction of the fuel of omen on fire, then carbon monoxide and carbon dioxide occur, and carbon monoxide will be detected by apparatus for measuring concentration 7.Therefore, on fire in order to what prevent in pulverizer 5, need in pulverizer 5, the oxidation reaction of the fuel as omen on fire do not occurred, that is, in the gas of the outlet of pulverizer 5, make carbon monoxide and and carbon dioxide be not detected.
Further, if use the fat coal of the bituminous coal that ignition temperature is high etc., then, in the gas of the outlet of pulverizer 5, can't detect carbon monoxide and carbon dioxide.This is because, compare the temperature of the conveyance air (hot blast) being supplied to pulverizer 5, temperature one side that fuel starts oxidation reaction is much higher.
In arithmetic unit 11, be previously stored with the coal proterties of the oxygen containing ratio of coal A and coal B, hydrogen containing ratio, carbon containing ratio etc. as analysis data (assay value), and store 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, arithmetic unit 11 uses the composite rate of coal A, B as parameter, based on from apparatus for measuring concentration 7 measurement data and analyze data, make the O/C of the mixed coal being supplied to pulverizer 5 than change, control coal regulating device for supply quantity 3a, 3b so respectively.Thus, coal A, B is changed respectively to the quantity delivered of mixer 4.Also have, also can using the H/C of mixed coal than being prestored in arithmetic unit 11 as analysis data (assay value), arithmetic unit 11 uses the composite rate of coal A, B as parameter, based on from apparatus for measuring concentration 7 measurement data and analyze data, make the H/C of the mixed coal being supplied to pulverizer 5 than change, control coal regulating device for supply quantity 3a, 3b so respectively.In addition, (O+H)/C ratio also can be used to come alternative 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 is considered to because, O/C is than higher, and under low temperature, the volatile matter of imflammable gas etc. is more easily released, more on fire.Therefore, if make O/C than step-down, adjustment is supplied to the quantity delivered of coal A, B of pulverizer 5 so respectively, then the ignition temperature of coal dust uprises, and in pulverizer 5, the oxidation reaction as the fuel of omen on fire will be difficult to occur.Compare about H/C and compare too with (O+H)/C.
But, simple reduce O/C ratio, H/C ratio, (O+H)/C ratio, improve the ignition temperature being supplied to the mixed coal of pulverizer 5, the quantity delivered of cheapness and the low coal of ignition temperature can not be increased.Reducing to realize cost, under needing, pulverizer 5 in, degree on fire to occur, increasing the quantity delivered of cheapness and the low coal of ignition temperature as far as possible.
(work of the on fire anti-locking apparatus of pulverizer)
Next, for the work of the on fire anti-locking apparatus 10 of the pulverizer of above-mentioned formation, that is, the prevention method on fire of pulverizer is described.
From two kinds of coals A, B that coal bunker 1,2 supplies, mixed machine 4 mixes and is fed into pulverizer 5 as mixed coal.Be supplied to the quantity delivered of the coal A of mixer 4 from coal bunker 1, adjusted by coal regulating device for supply quantity 3a, be supplied to the quantity delivered of the coal B of mixer 4 from coal bunker 2, adjusted by coal regulating device for supply quantity 3b.
Mixed coal is pulverized by pulverizer 5 and becomes coal dust, by conveyance air, dried while be transported to coal burner 8.Coal dust is burnt by coal burner 8, and the heat produced by burning is reclaimed by boiler 9.Carbonomonoxide concentration in the gas of the outlet of pulverizer 5, is measured by apparatus for measuring concentration 7.In addition, the oxygen concentration in the gas of the outlet of pulverizer 5, is measured by measuring equipment for oxygen concentration ard 6.The measurement data (measurement result) of the carbonomonoxide concentration in the gas of the outlet of the pulverizer 5 that apparatus for measuring concentration 7 is measured, is transfused to arithmetic unit 11.
In arithmetic unit 11, be previously stored with the coal proterties of the oxygen containing ratio of coal A and coal B, hydrogen containing ratio carbon containing ratio etc. as analysis data (assay value), and store O/C ratio as analyzing data (assay value).Arithmetic unit 11 uses the composite rate of coal A, B as parameter, based on from apparatus for measuring concentration 7 measurement data and analyze data, make the O/C of the mixed coal being supplied to pulverizer 5 than change, control coal regulating device for supply quantity 3a, 3b so respectively.Thus, coal A, B is changed respectively to the quantity delivered of mixer 4.
Specifically, measure the carbonomonoxide concentration in the gas of the outlet of pulverizer 5, when its result does not detect carbon monoxide, because do not occur as the oxidation reaction of the fuel of omen on fire, so arithmetic unit 11 is based on the analysis data of trying to achieve in advance (O/C ratio), control coal regulating device for supply quantity 3a, 3b respectively, the O/C of mixed coal ratio is uprised, that is, make the ignition temperature step-down of mixed coal, adjustment is supplied to the quantity delivered of coal A, B of pulverizer 5 so respectively.Specifically, by increasing the quantity delivered of the coal of the low side of ignition temperature, the ignition temperature of mixed coal is reduced.Thus, the quantity delivered of the coal that cheap and ignition temperature is low increases, and reduces therefore, it is possible to realize cost.Further, when carbon monoxide not detected, also can not controlling coal regulating device for supply quantity 3a, 3b, making the O/C of mixed coal than not changing.
On the other hand, measure the carbonomonoxide concentration in the gas of the outlet of pulverizer 5, its result is even when a small amount of carbon monoxide only being detected, because occur as the oxidation reaction of the fuel of omen on fire, arithmetic unit 11 is based on the analysis data of trying to achieve in advance, controls coal regulating device for supply quantity 3a, 3b respectively, the O/C of mixed coal is made to compare step-down, that is, make the ignition temperature of mixed coal uprise, so carry out to adjust respectively to be supplied to the quantity delivered of coal A, B of pulverizer 5.Specifically, be exactly the quantity delivered of the coal reducing the low side of ignition temperature, improve the ignition temperature of mixed coal.Thus, the quantity delivered of the coal that cheap and ignition temperature is low reduces, and in pulverizer 5, the oxidation reaction as the fuel of omen on fire does not occur, and in the gas of the outlet of pulverizer 5, can't detect carbon monoxide.Therefore, even if use the low coal of ignition temperature, what also can prevent in pulverizer 5 is on fire, prevents the fire of pulverizer 5 and the such disaster of blast.Further, H/C ratio and/or (O+H)/C also can be used than replacing O/C ratio.
In addition, as above-mentioned, biomass fuel also can be used as solid fuel.And by using cheapness and the low coal of ignition temperature and biomass fuel, substitute the fat coal of high price and the high bituminous coal of ignition temperature etc., what can either prevent in pulverizer 5 is on fire, can realize again cost and reduce.
Further, the carbonomonoxide concentration setting threshold value also can measured for apparatus for measuring concentration 7.Threshold value is the carbonomonoxide concentration when pulverizer 5 fuel (coal dust) is on fire, is tens of ppm.Then, apparatus for measuring concentration 7 measure carbonomonoxide concentration abundant approaching threshold value time, make the O/C of mixed coal than step-down, that is, make the ignition temperature of mixed coal uprise, adjustment is supplied to the quantity delivered of coal A, B of pulverizer 5 so respectively.In addition, when carbonomonoxide concentration is fully away from threshold value, the O/C of mixed coal ratio is uprised, that is, makes the ignition temperature step-down of mixed coal, adjust the quantity delivered of coal A, the B being supplied to pulverizer 5 via mixer 4 so respectively.Further, when carbonomonoxide concentration is fully away from threshold value, the O/C of mixed coal also can be made than change.
So, for carbonomonoxide concentration setting threshold value, carry out the control of coal regulating device for supply quantity 3a, 3b, what also can both prevent in pulverizer 5 is on fire, can use again cheapness and the low coal of ignition temperature fully, can realize cost and reduce.
(O/C ratio, H/C ratio and (O+H)/C are than the relation with ignition temperature)
Next, for the O/C ratio in each solid fuel, H/C ratio and (O+H)/C than being described with the relation of ignition temperature.In order to control coal regulating device for supply quantity 3a, 3b respectively, arithmetic unit 11 O/C ratio, H/C ratio and (the O+H)/C held in advance in each solid fuel is needed to compare the relation with ignition temperature.Therefore, use O/C ratio, H/C ratio and (O+H)/C than different three kinds of coals A, B, C one or more, investigate the ignition temperature of the coal dust pulverized.The coal dust shown in Fig. 2 is used to play fire test device 21 in this investigation.The coal proterties of three kinds of coals A, B, C is shown in table 1.
[table 1]
| Coal kind | Coal A | Coal B | Coal C |
| Fuel ratio | 1.55 | 1.21 | 0.91 |
| Volatile ingredient [wt%-DB] | 35.24 | 43.07 | 49.09 |
| Fixed carbon [wt%-DB] | 54.58 | 52.21 | 44.64 |
| Three compositions | |||
| Combustible component [%] | 87.31 | 89.94 | 86.63 |
| Non-combustible composition [%] | 9.90 | 4.46 | 5.79 |
| Moisture [%] | 2.78 | 5.60 | 7.58 |
| Add up to [%] | 100 | 100 | 100 |
| Chemical composition (dry measure value) | |||
| Carbon C [%-DB] | 73.45 | 75.46 | 68.34 |
| Hydrogen H [%-DB] | 4.95 | 5.44 | 5.30 |
| Oxygen O [%-DB] | 9.07 | 12.04 | 18.79 |
| Sulphur S [%-DB] | 0.59 | 0.74 | 0.32 |
| Nitrogen N [%-DB] | 1.75 | 1.60 | 0.98 |
| Chlorine Cl [%-DB] | 0.00 | 0.00 | 0.00 |
| Ash content [%-DB] | 10.18 | 4.72 | 6.27 |
| Add up to [wt%-DB] | 100 | 100 | 100 |
| 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 cylinder of internal diameter φ 25mm × 700L; Quantitative coal dust is supplied to the pulverized coal feeder 23 in the vertical reaction tube 22 of cylinder; Be located at the heater 24 of the periphery of the vertical reaction tube 22 of cylinder; Supply by the gas feed line 25 of the mist heated in the vertical reaction tube 22 of cylinder; Be located at the receiving vessel 27 of the below of the vertical reaction tube 22 of cylinder; Be located at the carbonomonoxide concentration meter 26 of the bottom of the vertical reaction tube 22 of cylinder; Be located at the fracture plate 29 of the top of the vertical reaction tube 22 of cylinder.
The atmosphere temperature of the inside of the vertical reaction tube 22 of cylinder, can utilize heater 24, from normal temperature to about 400 DEG C, and longitudinally heating up roughly equably along the vertical reaction tube 22 of cylinder.At this, the programming rate of the atmosphere temperature of the inside of the vertical reaction tube 22 of cylinder, makes it to be adjusted to about 5 DEG C/min.
In addition, in the side of the vertical reaction tube 22 of cylinder, along longitudinally, 8 places are provided with thermocouple jack, in these thermocouple jacks, are inserted with the armouring K thermocouple 28 of external diameter φ 1mm respectively.By these armourings K thermocouple 28, the atmosphere temperature on the central shaft of the inside of the vertical reaction tube 22 of cylinder can be measured.
Gas feed line 25 has as follows: mixing nitrogen (gas that partial pressure of oxygen is lower than air) and air and make the mixing chamber 31 of mist; Measure the oxymeter 32 of the oxygen concentration in mist; That heats mist adds hot heater 33.Fracture plate 29 is closed usually, if become high pressure in the vertical reaction tube 22 of cylinder, then becomes open mode.
At this, in order to test under the condition identical with pulverizer 5, and establish several experimental condition.That is, as experimental condition, moisture containing ratio is used to be adjusted to the coal dust of the scope of 4.0 ~ 5.0% in advance.In addition, as experimental condition, making particle diameter be the ratio of the coal dust of less than 75 μm is more than 80%.In addition, as experimental condition, Air/Coal ratio (be supplied to the vertical reaction tube 22 of cylinder by the amount [L/min] of mist that heats and the ratio of coal quantity delivered [g/min]) is made to be 1.7.In addition, as experimental condition, the coal dust holdup time be trapped in the vertical reaction tube of cylinder 22 is made to be about 6 seconds.In addition, suppose that coal dust particle is mobile in the vertical reaction tube 22 of cylinder with the speed identical with mist.In addition, assuming that coal dust can not adhere to and be deposited in the inside of pulverizer 5.
From the quantitative coal dust of pulverized coal feeder supply, fall in the vertical reaction tube 22 of cylinder in deadweight.In addition, be fed in the vertical reaction tube 22 of cylinder from gas feed line 25 by the mist heated.In the vertical reaction tube 22 of cylinder, coal dust and mist are heated to identical temperature.Thereafter, coal dust is fallen system from the flange part 22a of the bottom of the vertical reaction tube 22 of cylinder, accumulates in receiving vessel 27.
If coal dust, being stranded in the holdup time in the vertical reaction tube 22 of cylinder, rises to the temperature that coal dust is on fire, then the carbonomonoxide concentration meter 26 being arranged at the bottom of the vertical reaction tube 22 of cylinder detects the rising of carbonomonoxide concentration.While make the partial pressure of oxygen of the mist be supplied in the vertical reaction tube 22 of cylinder change, and utilize heater 24 that the atmosphere temperature in the vertical reaction tube 22 of cylinder is changed, while carry out repeating test, the carbonomonoxide concentration calculated in the gas of the outlet of the vertical reaction tube 22 of cylinder reaches the moment of more than 30ppm, the mean value of the atmosphere temperature in the vertical reaction tube 22 of cylinder, in this, as the ignition temperature of coal dust.Further, also can measure the gas concentration lwevel in the gas of the outlet of the vertical reaction tube 22 of cylinder, thus calculate the ignition temperature of coal dust.
With the mol ratio of the oxygen containing ratio of coal and carbon containing ratio (O/C than) for the measurement result of the ignition temperature of the coal dust of parameter shows in figure 3.In addition, with the mol ratio of the hydrogen containing ratio of coal and carbon containing ratio (H/C than) for the measurement result of the ignition temperature of the coal dust of parameter shows in the diagram.In addition, with the mol ratio of the oxygen containing ratio of coal and hydrogen containing ratio and carbon containing ratio ((O+H)/C than) for the measurement result of the ignition temperature of the coal dust of parameter shows in Figure 5.According to the measurement result of the ignition temperature of coal dust, 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 due to, O/C ratio, H/C ratio, (O+H)/C are than higher, and under low temperature, the volatile matter of imflammable gas etc. is more easily released, thus more on fire.Therefore, control O/C ratio, H/C ratio, (the O+H)/C ratio in solid fuel, on fire from the view point of in pulverizer 5, be considered to the operating condition making pulverizer 5 safety work.In addition, from the measurement result of the ignition temperature of coal dust, in order to prevent the on fire of coal dust, the temperature of the conveyance air (hot blast) of the entrance of pulverizer 5 is preferably made to be in less than 200 DEG C.
(modified embodiment of the present embodiment)
Above, embodiments of the present invention are described, but are only exemplified with concrete example, but not be particularly limited to the present invention, concrete formation etc. can change by suitable design.In addition, the functions and effects described in working of an invention mode, but be the effect enumerating the best produced by the present invention, and effect of the present invention does not limit by described in embodiments of the present invention.
Such as, the control of coal regulating device for supply quantity 3a, 3b of being undertaken by arithmetic unit 11, not by above-mentioned restriction.Even if apparatus for measuring concentration 7 does not detect carbonomonoxide concentration, also the O/C in solid fuel can be made to compare step-down, that is, solid-fuelled ignition temperature is uprised, so adjustment is supplied to each solid-fuelled quantity delivered of pulverizer 5, even if apparatus for measuring concentration 7 detects carbonomonoxide concentration, if its value is lower than threshold value, then the ratio of the O/C in solid fuel also can be made to uprise, namely, make solid-fuelled ignition temperature step-down, so adjustment is supplied to each solid-fuelled quantity delivered of pulverizer 5.In a word, as long as do not occur in pulverizer 5 in scope on fire, adjustment is supplied to each solid-fuelled quantity delivered of pulverizer 5.Compare about H/C and compare too with (O+H)/C.
In detail and describe the present invention with reference to specific embodiment, but can not depart from the spirit and scope of the present invention and in addition various change and correction, this is concerning should be clear from the person that has come.
The application based on the Japanese patent application (patent application 2010-114451) applied on May 18th, 2010, its content this with reference to and quote.
[INDUSTRIAL APPLICABILITY]
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 cylinder
23 pulverized coal feeders
24 heaters
25 gas feed line
26 carbonomonoxide concentration meters
27 receiving vessels
28 armouring K thermocouples
32 oxymeters
33 heaters
Claims (4)
1. a prevention method on fire for pulverizer, is characterized in that, is the prevention method on fire of the pulverizer of pulverized solid fuel, wherein,
Try to achieve at least one in the ratio of the oxygen containing ratio/carbon containing ratio in each solid fuel, hydrogen containing ratio/carbon containing ratio, (oxygen containing ratio+hydrogen containing ratio)/carbon containing ratio in advance as assay value,
Measure the concentration of carbon monoxide in the gas in the exit of described pulverizer and/or carbon dioxide,
Based on measurement result and the described assay value of described concentration, at least one making to be supplied in the ratio of the oxygen containing ratio/carbon containing ratio in described each solid fuel of described pulverizer, hydrogen containing ratio/carbon containing ratio, (oxygen containing ratio+hydrogen containing ratio)/carbon containing ratio is namely congener than changing with described assay value, when carbon monoxide and carbon dioxide being detected, this is made to compare step-down, when carbon monoxide and carbon dioxide not detected, make this than uprising, so adjustment is supplied to described each solid-fuelled quantity delivered of described pulverizer.
2. the prevention method on fire of pulverizer according to claim 1, is characterized in that, described solid fuel is at least one in coal and biomass fuel.
3. an on fire anti-locking apparatus for pulverizer, is characterized in that, be the on fire anti-locking apparatus of the pulverizer of pulverized solid fuel, it has:
Quantity delivered guiding mechanism, its adjustment is supplied to each solid-fuelled quantity delivered of described pulverizer;
Concentration measuring mechanism, it measures the concentration of carbon monoxide in the gas in the exit of described pulverizer and/or carbon dioxide;
Storing mechanism, at least one in the ratio of the oxygen containing ratio/carbon containing ratio in the described each solid fuel of its storage, hydrogen containing ratio/carbon containing ratio, (oxygen containing ratio+hydrogen containing ratio)/carbon containing ratio is as assay value;
Controlling organization, the described assay value that its measurement result based on described concentration measuring mechanism and described storing mechanism store, namely congener than changing with described assay value with at least one making to be supplied in the ratio of oxygen containing ratio/carbon containing ratio in described each solid fuel of described pulverizer, hydrogen containing ratio/carbon containing ratio, (oxygen containing ratio+hydrogen containing ratio)/carbon containing ratio, when carbon monoxide and carbon dioxide being detected, this is made to compare step-down, when carbon monoxide and carbon dioxide not detected, make this than the mode uprised, 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 one in coal and 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 CN102893089A (en) | 2013-01-23 |
| CN102893089B true 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 (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2207225Y (en) * | 1994-08-01 | 1995-09-13 | 林协中 | Explosion-proof dustless universal pulverizer |
| 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 |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08121711A (en) * | 1994-10-19 | 1996-05-17 | Hitachi Ltd | Pulverized coal combsition method and pulverized coal combustion device and pulverized coal burner |
-
2010
- 2010-05-18 JP JP2010114451A patent/JP5385853B2/en active Active
-
2011
- 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
- 2011-05-11 WO PCT/JP2011/060827 patent/WO2011145493A1/en active Application Filing
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2207225Y (en) * | 1994-08-01 | 1995-09-13 | 林协中 | Explosion-proof dustless universal pulverizer |
| 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 |
|---|---|
| KR101369705B1 (en) | 2014-03-03 |
| JP2011240250A (en) | 2011-12-01 |
| JP5385853B2 (en) | 2014-01-08 |
| CN102893089A (en) | 2013-01-23 |
| KR20130018888A (en) | 2013-02-25 |
| WO2011145493A1 (en) | 2011-11-24 |
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