KR101497573B1 - Apparatus for Preventing Spontaneous Ignition of Conveying Coal in System for Drying Coal - Google Patents

Abstract

The present invention relates to a device for preventing spontaneous ignition of transferred coal for drying in a coal drying apparatus and, more specifically, to a device for preventing spontaneous ignition caused by oxidation of the coal when transferring coal from a coal supplier supplying a certain amount to a multistage dryer via a grinder in the multistage dryer in which coal is dried by using reheating steam. The present invention has a purpose of drying coal and preventing spontaneous ignition of coal by spraying saturated steam and/or nitrogen on coal transferred on a transferring plate by mixing saturated steam and/or nitrogen with reheating steam in a certain ratio and spraying on the transferred coal in a coal drying apparatus in which the coal used as fuel for a thermal power plant is supplied to a dryer and dried with the reheating steam for the coal drying apparatus which comprises a first coal dryer and a second coal dryer, and secondarily dries the coal primarily dried in the first coal dryer by putting into the second coal dryer.

Description

TECHNICAL FIELD [0001] The present invention relates to an apparatus for preventing spontaneous ignition of coal in a coal drying apparatus,

The present invention relates to a device for preventing spontaneous ignition of coal conveyed for drying in a coal drying apparatus, and more particularly, to a multi-stage drying apparatus for drying coal using reheat steam, The present invention relates to a device for preventing spontaneous combustion due to oxidation of coal when coal is conveyed to a dryer of a dryer.

Generally, a coal-fired thermal power plant burns approximately 180 tons / hr of coal per 500 MW, and supplies approximately 37 tons of coal to the boiler per diffuser. A 500 MW coal-fired thermal power plant will have approximately six 500-ton capacity coal reservoirs, five of which will be supplied with normal coal, and the other will have a reserve coal reserve It is operated with low-fidelity.

Moreover, in the coal-fired thermal power plant, the standard thermal power design standard for coal is 6,080 Kcal / Kg, designed to use low-moisture bituminous coal of less than 10%. Some coal-fired power plants use imported coal, some of which have an average moisture content of at least 17%, which reduces the combustion efficiency of the boiler. If the calorific value of the coal used as the standard thermal power combustion limit is 5,400 Kcal / Kg is low, it is expected that the power generation will decrease and the fuel consumption will increase due to the decrease of combustion efficiency. In addition, when the coarse coal with a low calorific value of high water content is used, the water content is higher than the design standard and the conveying system for conveying the coal is not smooth, and when the coal is pulverized by the differentiator, the efficiency is lowered, , It may happen that the heat distribution generated in the boiler is operated with drift and abnormal condition. However, in order to reduce fuel costs in thermal power plants, the proportion of sub-bituminous coal is gradually increasing to about 41 ~ 60%.

In addition, with the expectation of the global economic recovery and the destruction of nuclear power plants due to the Japanese earthquake, the demand for coal-fired power plants is expected to rise steadily as the demand for thermal power plants increases. The global coal market is changing from the consumer to the supplier, and it is difficult to supply and supply stable coal. Production of high calorific coal is expected to remain at the current level, which is unbalanced supply and demand.

Among the total coal reserves of the world coal, the low calorific value is about 47%, but the calorific value is low and the water content is high, so the low calorific value burning of high water such as combustion trouble at the time of combustion is difficult to completely ignite in the market. Until now, there has been a high tendency to rely on stable oil prices and low production costs of nuclear power generation worldwide, but there are many plans for the construction of coal-fired thermal power plants due to the rapid rise in oil prices and anxiety about nuclear power generation .

Conventionally, the technique of drying coal (thermal drying) is a rotary drying method in which coal particles in the inside are dried with a high temperature gas while rotating a shell of a cylinder into which coal is charged, and a rotary drying method in which coal is dried from a high temperature (Flash, Pneumatic) drying method in which the gas is raised from the bottom to the top, and a fluid-bed drying method in which the high-temperature drying gas rises to the top with fine particles to dry the coal.

Coal is divided into surface moisture attached to the pores between the coal particles and bonded water which is bound to the pores inside the coal. The surface moisture occupies most of the water sprayed during the washing process, transportation and storage in the mountain, and its amount is determined by the surface area and the water absorption. The smaller the particle size, the larger the surface area and the capillary between particles and particles is formed. And the water content becomes larger. The combined moisture is formed in coal-fired generators, which are lignite, bituminous coal (bituminous coal, bituminous coal), and anthracite. If the coal has a lot of water, the calorific value is lowered and the transportation cost is increased, so it is necessary to control the water in the process of mixing, grinding and separating the coal.

Further, in a device for drying coal by spraying high-temperature reheating steam under a dryer while conveying the pulverized coal through a multi-stage dryer, that is, a conveyor having a plurality of through holes formed therein for passing the reheat steam or a plurality of conveyor plates, There is a problem that coal can be spontaneously ignited during transportation.

Normally, spontaneous ignition is a phenomenon where a substance placed in the air spontaneously generates heat at room temperature and is ignited and burned. Causes of spontaneous ignition include oxidative heat of materials, decomposition heat, adsorption heat, polymerization heat, and fermentation heat, and further, heat of reaction due to oxidation, decomposition or adsorption may be accumulated. This is caused by heat generated by adsorption, and examples thereof can be found in activated carbon, charcoal or ore. The crushed surface of coal or sulphide ore absorbs the oxygen in the air and oxidizes it to generate heat. If it is not cooled, the temperature rises gradually to absorb more oxygen, and finally it is spontaneously ignited. Such spontaneous ignition phenomena are often seen not only in mines but also in underground mines outside the mines or in ore deposits. Spontaneous ignition in the mine is caused by mine fire, fullness of toxic gas, and in particular, there is a possibility of gas explosion in the mine of a coal mine, and prevention of this is very important in safety management.

Therefore, in order to dry the coal, the possibility of spontaneous ignition in the dried coal is increased when the pulverized coal is supplied and conveyed to the dryer. That is, before the coal is dried, a certain amount of water is contained in the coal and the risk of ignition is low. However, after the coal is dried through the multi-stage dryer, it is oxidized while oxygen is absorbed in the air, Management problems arise.

As a prior art related to the present invention, Patent Document 1 discloses a method for improving the drying efficiency of a primary coal, which is primarily dried in a low-grade coal stabilizer, by using a wave-type vibration for uniform mixing with a heavy oil powder And a flow plate is provided. The vibration plate allows the low-grade coal and the heavy oil powder to be mixed evenly. The drying steam for drying the coal can not be uniformly sprayed on the surface of the coal, thereby reducing the drying efficiency.

Korean Patent Registration No. 10-0960793 (Jun. 3, 2010, Announcement, High-grade method and apparatus for lower coal)

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above problems, and it is an object of the present invention to provide a coal drying apparatus for supplying coal used as a fuel for a thermal power plant to a dryer and drying it with reheated steam, And spraying saturated steam and / or nitrogen onto the coal conveyed on the transfer plate, in addition to the drying of the coal by spraying the coal onto the coal, thereby preventing spontaneous combustion of the coal.

Another object of the present invention is to improve the combustion efficiency of a thermal power plant boiler by increasing the heating value of coal by making it possible to maintain an appropriate moisture content of coal by effectively drying coal, thereby reducing fuel consumption.

It is another object of the present invention to provide a drying technology and a technology applicable to a thermal power plant that can prevent environmental problems due to incomplete combustion of coal by controlling moisture contained in coal.

In order to achieve the above object, the present invention is characterized in that a pair of first driving sprockets and a pair of first driven sprockets are separated from each other by a predetermined distance and are respectively fastened to first chains, A pair of first guide rails horizontally supporting the first transfer plate are provided under the upper second chain connected between the first drive sprocket and the first driven sprocket, A pair of second guide rails for horizontally supporting the first conveying plate are provided below the lower first chain connected between the first driven sprockets and a pair of first guide rails for horizontally supporting the first conveying plate, A second steam chamber for spraying reheat steam supplied from a reheater is installed under the lower first chain, and a first exhaust gas chamber for collecting exhaust gas is installed on the upper first chain, And, a first and a second coal drier off-gas chamber for collecting exhaust gas on the lower side chain installed first; And a pair of second drive sprockets and a pair of second driven sprockets are separated from each other by a predetermined distance and connected to second chains, a plurality of second transfer plates are hingedly coupled between the second chains, A pair of third guide rails horizontally supporting the second transfer plate are provided below the upper second chain connected between the drive sprocket and the second driven sprocket, A pair of fourth guide rails for horizontally supporting the second transfer plate are provided under the chain, a third vapor chamber for spraying the reheated steam supplied from the reheater is installed below the upper second chain, A third exhaust chamber for collecting exhaust gas is provided on the upper second chain, and a third exhaust chamber for collecting the exhaust gas is installed on the upper second chain, And a second coal dryer installed with a fourth exhaust gas chamber for collecting the coal, wherein the first coal dryer in the first coal dryer is charged with a second coal dryer to perform secondary drying, Supplying the generated reheated steam through the first reheat steam supply pipe, supplying nitrogen from the nitrogen feeder through the first nitrogen feed pipe, supplying the saturated steam generated in the saturated steam generator through the first saturated steam supply pipe, Way valve is connected to a four-way valve, wherein the four-way valve communicates with the reheat steam, nitrogen and saturated steam or nitrogen or saturated steam through a steam supply line to the first, second, and third saturated steam supply lines, Supplying nitrogen from the nitrogen feeder through a second nitrogen feed pipe, supplying the saturated steam generated in the saturated steam generator to the second saturated vapor Way valve, the three-way valve is connected to the nitrogen and saturated steam or nitrogen or saturated vapor through a gas supply line to a plurality of spray nozzles, and the second nitrogen supply line and the second saturated vapor supply line are connected to a three- And the coal is fed to the first transfer plate and the second transfer plate to prevent spontaneous ignition of coal during the drying and transportation of the coal, .

Also, in the present invention, the four-way valve may supply a certain proportion of reheated steam and nitrogen by automatic or manual operation, or supply a proportion of reheated steam and saturated steam, or a proportion of reheated steam and nitrogen and saturated Steam can be supplied.

Further, in the present invention, the 3-way valve may supply a certain percentage of nitrogen and saturated steam by automatic or manual operation, or may supply a certain amount of nitrogen or saturated steam.

Further, in the present invention, the injection nozzles may be installed in front of and behind the first exhaust gas chamber to the fourth exhaust gas chamber, respectively.

According to the present invention, it is possible to maximize the use of the coal drying apparatus by preventing ignition or spontaneous ignition of coal, which may occur when the coal is dried or transferred in the coal drying apparatus, It is possible to solve the environmental problem by minimizing the discharge and to prevent the incomplete combustion of coal by removing the water remaining inside and outside the coal which is the fuel of the thermal power plant so that the hot reheated steam easily contacts with the coal particles, And further improve the stability of coal supply by increasing the utilization of low-grade coal which is in low demand. In addition, it is possible to use low-cost coal, which is less expensive than high-calorific coal, from the coal drying apparatus to which the coal supply device for reducing dust is applied, and it is possible to reduce fuel cost and cost by reducing coal import quantity, Therefore, it is possible to reduce the emission of waste and pollutants generated from the flue gas and to reduce the carbon dioxide, and it can be expected that the effect of substitution of foreign technology and the export of the equipment abroad can be expected.

1 is a block diagram showing a coal drying apparatus including a device for preventing spontaneous combustion of transported coal according to the present invention.
2 is a view showing the front view of the coal drying apparatus according to the present invention.
3 is a schematic view showing a side view of a coal drying apparatus according to the present invention.
4 and 5 are block diagrams showing an embodiment of an apparatus for preventing spontaneous combustion of transferred coal in a coal drying apparatus according to the present invention.
FIG. 6 is a block diagram showing an apparatus for preventing spontaneous combustion of transferred coal in the coal drying apparatus according to the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of an apparatus for preventing spontaneous ignition of coal in a coal drying apparatus according to the present invention will be described in detail with reference to the accompanying drawings.

The apparatus for preventing spontaneous ignition of transported coal of the present invention is installed in a coal drying apparatus. In the apparatus for feeding coal of a coal drying apparatus, while supplying and transporting coal to a conveying device such as a conveyor or a transfer plate, nitrogen and / When the coal is dried by spraying a mixture of saturated steam at a certain ratio or by mixing the nitrogen containing the reheated steam at a certain ratio or spraying the saturated steam containing the reheated steam at a certain ratio, . In addition, in the coal drying apparatus, nitrogen and / or saturated steam is mixed and sprayed on the surface of coal while conveying coal to a conveying device such as a conveyor or a transfer plate to prevent spontaneous combustion of coal.

In FIG. 1, the low-lean burn 200 is a place for storing and storing coal for use as a boiler fuel for a thermal power plant. Coal contains surface moisture and internal moisture. Furthermore, the coal stored in the low-leaner (200) is sprayed with water periodically to prevent scattering of coal dust. The coal stored in the low-carbon plant 200 is transferred to the coal drying apparatus 100 through a conveying system or the like. At this time, coal of low-leaner (200) whose moisture has not been removed may be transferred to a drying coal supply tank (300) connected to the coal drying apparatus. The coal stored in the coal supply tank 300 is supplied to the coal drying apparatus 100 by a predetermined amount in the coal quantity feeder 400. The coal drying apparatus 100 includes a first coal dryer 110 and a third coal dryer 170 for naturally drying coal discharged through the second coal dryer 140. The first coal dryer 110 and the second coal dryer 140 have substantially the same structure. The naturally dried coal passing through the third coal dryer (170) is stored in the dry coal storage tank (600) and supplied to the boiler fuel of the thermal power plant (700).

Nitrogen supplied from the nitrogen supplier 800 and saturated steam generated from the saturated steam generator 900 are supplied to the first coal dryer 110 and the second coal dryer 140 of the coal drying apparatus 100 .

2 and 3 show an example of a coal drying apparatus 100 equipped with an apparatus for preventing spontaneous combustion of transported coal according to the present invention. The coal drying apparatus 100 includes a coal loader 400 and a coal dryer 140. The coal dryer 100 includes a multi-stage dryer such as a first coal dryer 110, a second coal dryer 140 for secondarily drying coal dried in the first coal dryer, And a third coal dryer 170 for naturally drying the coal dried in the second coal dryer and supplying the dried coal to the dry coal storage tank 50.

The first coal dryer 110 includes a pair of first drive sprockets 111 and a pair of first driven sprockets 112 spaced apart from each other by a predetermined distance and fastened to the first chains 113, A plurality of first transfer plates 114 are hingedly coupled between the first drive sprocket 111 and the first driven sprocket 112 and a first conveying plate 114 is hinged between the first drive sprocket 111 and the first driven sprocket 112, A pair of first guide rails 115 for horizontally supporting the plate 114 and a lower first chain 113 connected between the first drive sprocket 111 and the first driven sprocket 112 A pair of second guide rails 116 for horizontally supporting the first transfer plate 114 are installed and a first steam injecting reheated steam supplied from the reheater 500 below the upper first chain 113, A second vapor chamber 123 for spraying the reheat steam supplied from the reheater 500 is installed under the lower first chain 113, The side, and the first off-gas chamber (124) installed for collecting the exhaust gas over a first chain 113, the second off-gas chamber 126 for collecting the exhaust gas over the lower first chain 113 is installed.

The second coal dryer 140 includes a pair of second drive sprockets 141 and a pair of second driven sprockets 142 spaced apart from each other by a predetermined distance and connected to the second chains 143, A plurality of second transfer plates 144 are hingedly coupled between the chains 143 and an upper second chain 143 connected between the second drive sprocket 141 and the second driven sprocket 142, A pair of third guide rails 145 for horizontally supporting the transfer plate 144 are provided and under the lower second chain 143 connected between the second drive sprocket 141 and the second driven sprocket 142, A pair of fourth guide rails 146 for horizontally supporting the second transfer plate 144 and a third guide rail 146 for spraying the reheated steam supplied from the reheater 500 below the upper second chain 143, A vapor chamber 150 is installed and a fourth vapor chamber 153 for spraying the reheated steam supplied from the reheater 500 is installed below the lower second chain 143 A third exhaust gas chamber 154 for collecting exhaust gas is provided on the upper second chain 143 and a fourth exhaust gas chamber 156 for collecting exhaust gas on the lower second chain 143.

The first transfer plate 114 is provided with a plurality of through holes 114a so that the reheated steam injected from the first and second vapor chambers 120 and 123 passes through the first transfer plate 114 and comes into contact with the coal particles. Is formed. Guard 114b of a predetermined height is provided at left and right sides of the top surface of the first transfer plate 114 so that the charged coal pile does not flow down to the left or right of the first transfer plate 114. [ The guard 114b has a substantially trapezoidal shape and a shape with a wide upper side and a narrow lower side. Therefore, the guards 114b of the first transfer plate 114 are overlapped with the guards 114b adjacent to each other. At this time, it is preferable that the guard 114b of the first transfer plate 114 is installed in a substantially zigzag direction with the guard 114b adjacent to each other. The reheat steam injected from the first and second steam chambers 120 and 123 is supplied to the left and right sides of the bottom surface of the first transfer plate 114 in the first and second steam chambers 120 and 123 The shielding plate 114c is installed so as not to be lost.

The second transfer plate 144 is provided with a plurality of through holes 144 for allowing the reheated steam injected from the third and fourth steam chambers 150 and 153 to pass through the second transfer plate 144, 144a are formed. A guard 144b having a predetermined height is provided on the left and right sides of the upper surface of the second transfer plate 144 so as to prevent the charged coal pile from flowing down to the left or right of the second transfer plate 144. The guard 144b has a substantially trapezoidal shape and an upper light-narrow narrow shape with a narrow lower portion. Therefore, the guards 144b of the second transfer plate 144 are overlapped with the guards 144b adjacent to each other. At this time, it is preferable that the guard 144b of the second transfer plate 144 is provided in a substantially zigzag direction with the guard 144b adjacent to each other. The reheat steam injected from the third steam chamber 150 and the fourth steam chamber 153 is supplied to the left and right sides of the lower end surface of the second transfer plate 144 by the third steam chamber 150 and the fourth steam chamber 153 And the shielding plate 144c is installed so as not to be lost.

4, steam supply pipes 121 are installed in the first steam chamber 120 and the second steam chamber 123 provided in the first transfer plate 114 of the first coal dryer 110, A steam supply pipe 151 is installed in the third steam chamber 150 and the fourth steam chamber 153 provided in the second transfer plate 144 of the dryer 140, respectively. A four-way valve 1000 is installed in the steam supply pipes 121 and 151, respectively. Way valve 1000 interrupts the flow of fluid in four directions.

6, a four-way valve 1000 is provided with a reheated steam supply pipe 501 for supplying reheated steam generated in the reheater 500. [ The reheater 500 receives the exhaust gas discharged from the first to fourth exhaust gas chambers 124, 126, 154 and 156 corresponding to the first to fourth vapor chambers 120, 123, 150 and 153, . Way valve 1000 is provided with a nitrogen supply pipe 801 for supplying nitrogen from the nitrogen supplier 800. [ The nitrogen supplier 800 may include a device for supplying nitrogen from a storage tank for storing the liquefied nitrogen or for collecting and supplying nitrogen in the air. The four-way valve 1000 is also provided with a saturated steam supply pipe 901 for supplying saturated steam in the saturated steam generator 900. The saturated steam generated in the saturated steam generator 900 is a highly humid steam including a high temperature and a predetermined amount of moisture and the reheated steam generated in the reheater 500 is dry steam containing a high temperature and a certain amount of water or less.

Way valve 1000 is connected to the reheat steam supply pipe 501, the nitrogen supply pipe 801 and the saturated steam supply pipe 901 from the reheater 500, the nitrogen supplier 800 and the saturated steam generator 900, Nitrogen and saturated steam supplied through the steam supply pipes 121 and 151 to the corresponding steam chambers 120, 123, 150 and 153, respectively. The four-way valve 1000 is configured to supply only one of reheat steam, nitrogen, and saturated steam to the steam chambers 120, 123, 150, and 153 through the steam supply pipes 121 and 151 according to manual or automatic operation of the valve . Furthermore, the four-way valve 1000 is operated by manual or automatic operation of the valve, and nitrogen or saturated steam including the reheated steam is supplied to the steam chambers 120, 123, 150, and 153 through the steam supply pipes 121 and 151, As shown in FIG. Way valve 1000, it is possible to operate such that reheated steam and nitrogen or reheated steam and saturated steam, or reheated steam, nitrogen and saturated steam, respectively, are supplied at a constant rate. This is because if the moisture contained in the inside and the surface of the coal is evaporated when the coal is loaded and transported on the transfer plate as a high-temperature dried reheat steam, the possibility of spontaneous ignition during transportation may increase.

Therefore, the transfer charcoal spontaneous ignition prevention apparatus in the coal drying apparatus is operated by operating the four-way valve 1000 installed in the steam supply pipes 121 and 151 connected to the steam chambers 120, 123, 150 and 153, Mixed Nitrogen is injected into the transfer coal to prevent the ignition of the coal by preventing the coal from being oxidized by preventing the coal particles from coming into contact with oxygen.

Way valve 1000 provided in the steam supply pipes 121 and 151 connected to the steam chambers 120, 123, 150 and 153, the saturated steam mixed in the reheated steam is injected into the transfer coal, In addition to drying, saturated steam containing a certain amount of water is injected into the coal so that the coal particles are provided with a minimum amount of moisture that does not cause spontaneous combustion.

Way valve 1000 installed in the steam supply pipes 121 and 151 connected to the steam chambers 120, 123, 150 and 153 so that nitrogen and saturated steam mixed in the reheated steam are injected into the coal Thereby preventing oxygen from contacting the coal particles and providing a minimum amount of moisture that does not cause spontaneous ignition of the coal particles.

5, the nitrogen supplier 800 is provided with a second nitrogen supply pipe 802 for supplying nitrogen, and the saturated steam generator 900 is provided with a second saturated vapor supply pipe 902 for supplying saturated steam. And the second nitrogen supply pipe 802 and the second saturated vapor supply pipe 902 are connected to the three-way valve 1000. The three-way valve 1000 supplies nitrogen and saturated vapor or nitrogen or saturated vapor to the plurality of injection nozzles 1102 through the gas supply pipe 1101.

The three-way valve 1000 supplies a certain percentage of nitrogen and saturated steam by automatic or manual operation, or supplies a percentage of nitrogen or saturated steam.

The injection nozzles 1102 are provided at the front and rear of the first to fourth exhaust chambers 124 to 126 and 154 to 156 and are disposed on the first transfer plate 114 and the second transfer plate 144 Prevent spontaneous ignition of coal by spraying nitrogen and / or saturated steam on the surface of the coal before or after drying with reheated steam.

Accordingly, the apparatus for preventing the spontaneous ignition of the coal in the coal drying apparatus is provided with the steam chambers 120 and 123 provided below the first transfer plate 114 and the steam chambers 150 and 153 provided below the second transfer plate 144, Nitrogen and saturated steam are supplied at a predetermined ratio to the coal conveyed on the conveying plate so as to prevent the spontaneous combustion as well as the drying of the coal, and the first conveying plate 114 and the second conveying plate The drying efficiency is improved by spraying nitrogen and saturated steam at a certain rate on the surface of the coal conveyed to the coal conveying unit 144, and the loss of the coal drying apparatus due to the spontaneous ignition occurring in the drying process of the coal in the coal drying apparatus is prevented And the cost of maintenance and repair of the coal drying apparatus can be reduced.

While the invention has been shown and described with respect to the specific embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims. Anyone who has it will know it easily.

The present invention relates to a coal sprinkler and a method of manufacturing the coal sprinkler and a method of manufacturing the coal sprinkler. The guide bars 118 and 148 and the drive motors 119 and 149 and the decelerators 120 and 123 are installed in the guide rails 117 and 118, The present invention relates to a steam generator and a steam generator in which steam is supplied from a steam generator to a steam generator and a steam generator is installed in the steam generator. 200: low-firing 300: drying coal supply tank 400: coal quantitative feeder 500: reheating 501: reheat steam supply pipe 600: dry coal storage tank 700: thermal power plant 800: nitrogen supplier 801, 802: nitrogen supply pipe 900: saturated steam generator 901, 902: Saturated steam supply line 1000: 4-way valve 1100: 3-way valve 1101: Gas supply pipe 1102: injection nozzle C: coal

Claims (4)

A pair of first drive sprockets and a pair of first driven sprockets are spaced apart from each other by a predetermined distance and fastened to the first chains, a plurality of first transfer plates are hingedly coupled between the first chains, A pair of first guide rails for horizontally supporting the first transfer plate are provided below an upper second chain connected between the sprocket and the first driven sprocket, and a pair of first guide rails for horizontally supporting the lower first chain A pair of second guide rails horizontally supporting the first transfer plate are provided below the first transfer chamber, a first vapor chamber for spraying the reheated steam supplied from the reheater is provided below the upper first chain, A first exhaust chamber for collecting exhaust gas is provided on the upper first chain, and a second exhaust chamber for collecting the exhaust gas is installed on the lower first chain, A first coal dryer in the second off-gas chamber of the house are installed; And
A pair of second drive sprockets and a pair of second driven sprockets are spaced apart from each other by a predetermined distance and connected to the second chains, a plurality of second transfer plates are hingedly coupled between the second chains, A pair of third guide rails horizontally supporting the second transfer plate are provided below the upper second chain connected between the sprocket and the second driven sprocket and the lower second chain connected between the second drive sprocket and the second driven sprocket A pair of fourth guide rails for horizontally supporting the second conveying plate are provided below and a third steam chamber for injecting the reheated steam supplied from the reheater is provided below the upper second chain, A third exhaust chamber for collecting exhaust gas is provided on the upper second chain, and a third exhaust chamber for collecting the exhaust gas is provided on the upper second chain. A fourth and a second coal dryer in the exhaust gas chamber, which is installed,
Wherein the first coal dryer in the first coal dryer is charged with a second coal dryer to be secondarily dried,
Supplying the reheated steam generated from the reheater through the first reheat steam supply pipe, supplying nitrogen from the nitrogen feeder through the first nitrogen feed pipe, supplying the saturated steam generated in the saturated steam generator through the first saturated steam supply pipe Way valve is connected to a four-way valve, in addition to reheating steam, nitrogen and saturated steam or nitrogen or saturated steam to the steam supply line. The first reheat steam feed line, the first nitrogen feed line and the first saturated steam feed line are connected to a four- To the first to fourth vapor chambers,
Wherein the nitrogen feeder supplies nitrogen through a second nitrogen feed line and the saturated steam generated in the saturated steam generator is fed through a second saturated vapor feed line, wherein the second nitrogen feed line and the second saturated vapor feed line are three- And the 3-way valve supplies nitrogen, saturated steam, nitrogen or saturated steam to the plurality of injection nozzles through the gas supply pipe, and injects the coal into the coal conveyed to the first transfer plate and the second transfer plate, A device for preventing the spontaneous combustion of coal transferred in a coal drying device to prevent spontaneous ignition of coal during drying and transportation.
The method of claim 1, wherein the four-way valve is adapted to supply a proportion of reheated steam and nitrogen by automatic or manual manipulation, or to supply a proportion of reheated steam and saturated steam, or a proportion of reheated steam and nitrogen and saturated steam A device for preventing spontaneous combustion of coal transferred in a coal dryer.
The apparatus according to claim 1, wherein the three-way valve supplies nitrogen and saturated steam at a predetermined ratio or supplies a certain percentage of nitrogen or saturated steam by automatic or manual operation.
The apparatus according to claim 1, wherein the spray nozzles are disposed in front of and behind the first exhaust gas chamber to the fourth exhaust gas chamber, respectively.

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