CN103057889B - Device and method for inhibiting spontaneous combustion of open-air coal piles - Google Patents
Device and method for inhibiting spontaneous combustion of open-air coal piles Download PDFInfo
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- CN103057889B CN103057889B CN201310003102.4A CN201310003102A CN103057889B CN 103057889 B CN103057889 B CN 103057889B CN 201310003102 A CN201310003102 A CN 201310003102A CN 103057889 B CN103057889 B CN 103057889B
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Abstract
A device for inhibiting spontaneous combustion of open-air coal piles comprises a water tank, not full. The water tank covered with porous or slit cover plates is arranged below an open-air coal pile. A distribution and discharge pipe externally connected with a blower through an air supply pipe is arranged in the water in the water tank. A level meter is further disposed in the water tank. A water supplement pipe connected with a tap water source or other water sources is disposed on one side of the water tank. A drain pipe provided with a filter and connected with a drainage pump is disposed at the bottom of the water tank. The invention further provides a method for inhibiting spontaneous combustion of open-air coal piles. By the use of the device and method, the amount of oxygen absorbed by coal of the coal piles can be reduced, oxidization speed can be decreased, and adsorption heat and reaction exotherm are decreased. The coal piles can be cooled by air flowing in voids, so that spontaneous combustion of the coal piles is inhibited. The device manufactured according to the method has the advantages of simple structure, low energy consumption, convenience in operation, sufficient air source and the like and is conveniently applicable to coal-fired power plants.
Description
Technical field
The present invention relates to a kind of device that suppresses outdoor self-ignition of coal pile.The invention still further relates to the method that adopts described device to suppress outdoor self-ignition of coal pile.
Background technology
In large coal-fired power plant, for ensureing normal production, must lay in tens0000 tons of coals to few hundred thousand tonnes of, the storage life is the several months, and generally can only air storage.The heat accumulation producing due to slow oxidation causes temperature progressively to raise, and dieseling usually occurs these outdoor dumps, and wherein the spontaneous combustion problem of high volatile raw coal is especially serious.Analysis and statistics show, after volatile matter is greater than 35% bottle coal and free coal and stores 6 months, its thermal loss average out to 4.9%, and volatile matter was less than 17% meager coal storage after 6 months, its thermal loss average out to 2.0%, the spontaneous combustion of dump has not only caused huge economic loss, also gross pollution environment around.
From macroscopic aspect, self-ignition of coal pile, except depending on the physics and chemistry character of coal itself, also will be subject to oxygen concentration control in radiating condition and hole.And in microcosmic point, the spontaneous combustion of coal and coal absorption and the low-temperature oxidation process to oxygen is closely related.If the heat release of heat of adsorption and low-temperature oxidation reaction can not be shed in time, can cause the temperature of dump to raise gradually, and then cause oxidizing reaction to be accelerated and produce more heat and larger temperature rise, finally make dump that violent spontaneous combustion occurs.Therefore oxygen concentration and the radiating condition, controlled in dump hole are the main paties that suppresses self-ignition of coal pile.
There is the technology of multiple inhibition self-ignition of coal pile to be applied to scene, for example, reduced air penetration on dump surface with coverture compacting and improve apparent heat capacity and apparent heat conductance suppresses temperature rise rate.But the needed device of this scheme and method has, and structure is more complicated, energy consumption is higher, operation is convenient not, is not easy to apply in coal-fired power plant.
Summary of the invention
First technical matters to be solved by this invention, is just to provide a kind of device that passes through the outdoor self-ignition of coal pile of inhibition of controlling the contact of coal-oxygen.
Second technical matters to be solved by this invention, is just to provide a kind of method that adopts said apparatus to suppress outdoor self-ignition of coal pile.
Apparatus and method of the present invention, can effectively control the outdoor self-ignition of coal pile of coal-oxygen contact inhibition, and have the advantages such as simple in structure, energy consumption is low, easy to operate, gas source is sufficient, and the utmost point is convenient to apply in coal-fired power plant.
Solve above-mentioned first technical matters, the technical solution used in the present invention is as follows:
A kind of device that suppresses outdoor self-ignition of coal pile, it is characterized in that: comprise a water-filling but the pond of underfill, on described pond, be coated with porous or bar seam cover plate, pond is arranged under outdoor dump, is provided with by the external supply ventilating fan distribution of blast pipe comb in described tank water.
Described cover plate stands on the seat supports in pond by the edge in pond with several, a side installation in liquidometer, pond is installed in described pond and with the filling pipe being connected at tap water or other water source, bottom, the drain hose that filter is housed being connected with dewatering pump is installed.
On described distribution comb, perforate aperture is 1-3mm, and pitch of holes is 3-5mm.
Solve above-mentioned second technical matters, the technical solution used in the present invention is as follows:
Adopt said apparatus to suppress a method for outdoor self-ignition of coal pile, it is characterized in that: comprise the following steps:
S1 is piled up in coal on the cover plate in described pond;
S2 opens water compensating valve 11, observes the designation data of liquidometer 8, is 0.5-0.8m and distribution comb 6 submergences while being 0.2-0.3m when liquid level reaches water depth, closes moisturizing valve 11;
S3 starts the source switch of blower fan 3, send being cooled to the boiler smoke or the air that approach ambient temperature into the distribution comb 6 being immersed in pond 5 by blast pipe 4, the oxygen concentration of flue gas is less than 5%, the superficial velocity of flue gas in dump hole is 0.05-0.0.10cm/s, be the dump of 100000 sq ms for floor area, gas flow is 18000-36000Nm
3/ h;
S4, in the time that the water level in pond 5 exceedes setting value, starts the source switch of dewatering pump 10, and water unnecessary in pond is extracted out by drain hose 9.
The principle of the invention: adopt porous or there is the cover plate that bar stitches on the pond of a non-full liquid, the gas in pond can be flowed out from bottom to top from the hole of cover plate or gap, coal is piled up on cover plate; Send being cooled to the boiler smoke supply ventilating fan that approaches ambient temperature into the distribution comb being immersed in water by pipeline, flue gas escapes in pond through the aperture on distribution comb, after contacting with water, discharge the water surface, seeing through porous (or bar seam) cover plate enters in the hole of dump again, both can make dump all the time in the atmosphere in the competition of the multi component adsorption such as poor oxygen and carbon dioxide, water vapour, oxygen and nitrogen, again can be by the mobile effect of playing heat radiation of flue gas, and then reach the object that suppresses self-ignition of coal pile.Water in pond on the one hand can air-distributing aid comb improves the equilibrium of pressure of water surface upper gas, in addition on the one hand can be in the time of flue gas stop supplies (station boiler because of the blowing out of the reason such as accident or maintenance time), still can be to the air that high humidity is provided in dump, when now the moisture in wet air and oxygen are adsorbed by coal, form absorption competition, reduce the adsorbance of coal to oxygen and then reduced heat of adsorption and low-temperature oxidation speed, simultaneously, the wet air flowing out by dump hole also can play the effect of heat radiation, thereby reaches the object that suppresses self-ignition of coal pile.In addition, pond can also be used for collecting the ponding of dump rainy season.
Beneficial effect: the apparatus and method that propose according to the present invention, can reduce adsorbance, reduction oxidizing reaction rate, heat of adsorption and the exothermic heat of reaction of coal to oxygen in dump, and can dispel the heat to dump by flowing of gas in hole, thereby reach the effect that suppresses self-ignition of coal pile.
The device of the method manufacturing proposing according to this invention has the advantages such as simple in structure, energy consumption is low, easy to operate, gas source is sufficient, and the utmost point is convenient to apply in coal-fired power plant.
Brief description of the drawings
Fig. 1 is apparatus structure schematic diagram of the present invention;
Fig. 2 is the distribution calandria structure schematic diagram adopting in the present invention.
In figure, have: dump 1, cover plate 2, supply ventilating fan 3, blast pipe 4, pond 5, distribution comb 6, bearing 7, liquidometer 8, drain hose 9, dewatering pump 10, water compensating valve 11.
Detailed description of the invention
As depicted in figs. 1 and 2, the device of the outdoor self-ignition of coal pile of inhibition of the present invention, comprise the pond 5 that is arranged under outdoor dump 1, is coated with the water underfill of porous or bar seam cover plate 2 above, the gas in pond can be flowed out from bottom to top from the hole of cover plate or gap, basin bottom is provided with distribution comb 6, distribution comb 6(typical structure is shown in Fig. 2) be placed in pond 5 and be submerged in below the water surface, on distribution comb, perforate aperture is 1-3mm, pitch of holes is 3-5mm, distribution comb is by the external supply ventilating fan 3 of blast pipe 4, cover plate 2 is supported by edge and several bearings 7 that stand in pond in pond 5, liquidometer 8 is installed to measure water level wherein in pond, the one side installation in pond and the filling pipe being connected at tap water or other water source, the drain hose that filter is housed 9 being connected with dewatering pump 10 is installed in bottom, filling pipe is provided with water compensating valve 11.
One of typical device is as described below.With steel bar concrete casting pond 5, the cover plate 2 of porous adopts and is welded into some according to the size in pond 5 after carbon structural steel plate (typical thickness is 8-10mm) water cutter perforate (typical aperture be 2mm) and covers on pond 5, edge and several bearings 7 by steel bar concrete casting by pond 5 support, and dump 1 is placed on cover plate 2; The distribution comb 6 of porous can adopt pvc pipe material to make (typical caliber is 50-70mm) and is placed in pond 5 and is submerged in below the water surface, and the blast pipe 4 that distribution comb is manufactured by PVC material is connected by flange with blower fan 3; Blower fan 3 can be selected the 4-68-12.5 type blowing engine of Xinxiang air-blower plant, typical air output and pressure head are respectively 25000Nm3/h and 1000Pa, the MY-03 type liquidometer that liquidometer 8 can adopt Chaoyang, Nanjing instrument company is installed in pond 5, lower limit and the upper limit that can designated water level; A side installation in pond 5 can be used PP-R tube manufacture with the filling pipe being connected 11 at tap water or other water source, and it is 50mm that the typical case of the drain hose 9(with the PP-R tube manufacture caliber that filter is housed being connected is installed in bottom).Dewatering pump 10 can adopt the 250ZHL series of products of Heng Beng industry company, and its typical discharge capacity is 850m3/h, and lift is 6m.
Typically two of device is as described below.Pond 5 adopts brick mix structure, inner side is smeared cement and is formed waterproof layer, the cover plate 2 of porous adopts carbon structural steel plate (typical thickness is 8-10mm) water cutter to open after bar seam (typically stitching wide is 2mm) and is welded into some according to the size in pond 5 and covers on pond 5, supported by the edge in pond 5 and the bearing of several brick mix structures 7, dump 1 is placed on cover plate 2; The distribution comb 6 of porous can adopt galvanized steel pipe to make (typical caliber is 50-70mm) and is placed in pond 5 and is submerged in below the water surface, and the blast pipe 4 that distribution comb is manufactured by PVC material is connected by flange with blower fan 3; Blower fan 3 can be selected the KDF-500 series supply ventilating fan of four directions, Nanjing general blower fan factory, typical air output and pressure head are respectively 21000Nm3/h and 1200Pa, the HOH-S-Y type liquidometer that liquidometer 8 can adopt Jinsui River, Beijing Zhong Ke company is installed in pond 5, lower limit and the upper limit that can designated water level; Can make of galvanized steel pipe (typical caliber is 32mm) in a side installation in pond 5 and the filling pipe being connected 11 at tap water or other water source, the drain hose 9(typical case caliber that the zinc-plated tube manufacture of use that filter is housed being connected is installed in bottom is 50mm).Dewatering pump 10 can adopt the 200PQZ-4.5-.5 product of Han Nengbeng industry company, and its typical discharge capacity is 400m3/h, and lift is 7.5m.
Typically embodiment is on the basis of embodiment one and scheme two, increases a set of PLC control system, makes above-mentioned manually-operated process automation.
Adopt said apparatus to suppress the method for outdoor self-ignition of coal pile, it is characterized in that: comprise the following steps:
S1 dump is placed in to be had porous or has on the pond of non-full liquid of the cover plate of bar seam, and the gas in pond can be flowed out from bottom to top from the hole of cover plate or gap;
S2 opens water compensating valve 11, observes the designation data of liquidometer 8, is 0.5-0.8m and distribution comb 6 submergences while being 0.2-0.3m when liquid level reaches water depth, closes moisturizing valve 11;
S3 starts the source switch of blower fan 3, send being cooled to the boiler smoke or the air that approach ambient temperature into the distribution comb 6 being immersed in pond 5 by blast pipe 4, the oxygen concentration of flue gas is less than 5%, the superficial velocity of flue gas in dump hole is 0.05-0.0.10cm/s, be the dump of 100000 sq ms for floor area, gas flow is 18000-36000Nm
3/ h;
S4, in the time that the water level in pond 5 exceedes setting value, starts the source switch of dewatering pump 10, and water unnecessary in pond is extracted out by drain hose 9.
Claims (2)
1. a method that suppresses outdoor self-ignition of coal pile, is characterized in that: comprise the following steps:
S1 is piled up in coal on the cover plate in described pond;
S2 opens water compensating valve (11), observes the designation data of liquidometer (8), is 0.5-0.8m and distribution comb (6) submergence while being 0.2-0.3m when liquid level reaches water depth, closes water compensating valve (11);
S3 starts the source switch of blower fan (3), send being cooled to the boiler smoke or the air that approach ambient temperature into the distribution comb (6) being immersed in pond (5) by blast pipe (4), require the oxygen concentration of flue gas to be less than 5%, the superficial velocity of flue gas in dump hole is 0.05-0.0.10cm/s, be the dump of 100000 sq ms for floor area, gas flow is 18000-36000Nm
3/ h;
S4, in the time that the water level in pond (5) exceedes setting value, starts the source switch of dewatering pump (10), and water unnecessary in pond is extracted out by drain hose (9);
The device of the outdoor self-ignition of coal pile of inhibition of using in described method, comprise a water-filling but the pond (5) of underfill, on described pond, be coated with porous or bar seam cover plate (2), pond is arranged under outdoor dump (1), is provided with the distribution comb (6) by the external supply ventilating fan of blast pipe (4) (3) in tank water; Described cover plate (2) is supported by edge and several bearings (7) standing in pond of pond (5), the one side installation in liquidometer (8), pond is installed in described pond and with the filling pipe being connected at tap water or other water source, bottom, the drain hose that filter is housed (9) being connected with dewatering pump (10) is installed, filling pipe is provided with water compensating valve (11).
2. the method for the outdoor self-ignition of coal pile of inhibition according to claim 1, is characterized in that: the upper perforate of distribution comb (6) aperture of described device is 1-3mm, and pitch of holes is 3-5mm.
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| CN201310003102.4A CN103057889B (en) | 2013-01-04 | 2013-01-04 | Device and method for inhibiting spontaneous combustion of open-air coal piles |
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| CN201310003102.4A CN103057889B (en) | 2013-01-04 | 2013-01-04 | Device and method for inhibiting spontaneous combustion of open-air coal piles |
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| CN103057889B true CN103057889B (en) | 2014-12-10 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103540385A (en) * | 2013-10-10 | 2014-01-29 | 黑龙江大学 | Dust suppression and flame retardant method in waterway coal transport |
| CN108792403A (en) * | 2018-07-12 | 2018-11-13 | 谭晓光 | Vast capacity environmental protection closed bin coal storage method |
| CN109292348A (en) * | 2018-11-09 | 2019-02-01 | 大唐辽源发电厂 | Thermal power plant lignite storage organization and storage technology |
| CN114588568B (en) * | 2020-12-04 | 2023-01-10 | 浙江浙能富兴燃料有限公司 | Device for preventing spontaneous combustion of coal in strip-shaped coal storage yard |
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