JPS636434B2 - - Google Patents
Info
- Publication number
- JPS636434B2 JPS636434B2 JP57137276A JP13727682A JPS636434B2 JP S636434 B2 JPS636434 B2 JP S636434B2 JP 57137276 A JP57137276 A JP 57137276A JP 13727682 A JP13727682 A JP 13727682A JP S636434 B2 JPS636434 B2 JP S636434B2
- Authority
- JP
- Japan
- Prior art keywords
- pulverized coal
- valve
- storage tank
- coal storage
- inert gas
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 239000003245 coal Substances 0.000 claims description 50
- 239000011261 inert gas Substances 0.000 claims description 16
- 238000000034 method Methods 0.000 claims description 14
- 230000002269 spontaneous effect Effects 0.000 claims description 12
- 238000002485 combustion reaction Methods 0.000 description 9
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 5
- 239000001301 oxygen Substances 0.000 description 5
- 229910052760 oxygen Inorganic materials 0.000 description 5
- 239000003610 charcoal Substances 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000007796 conventional method Methods 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229910001873 dinitrogen Inorganic materials 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000036284 oxygen consumption Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/001—Injecting additional fuel or reducing agents
- C21B5/003—Injection of pulverulent coal
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Solid Fuels And Fuel-Associated Substances (AREA)
Description
【発明の詳細な説明】
本発明は微粉炭の自然発火防止方法に関し、特
に供給タンク内の高圧空気がバルブから漏れる漏
出量が一定値を越える場合に不活性ガスを送入す
ることにより、微粉炭の自然発火を防止する方法
に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for preventing spontaneous ignition of pulverized coal, and in particular, when the amount of high-pressure air leaking from a valve in a supply tank exceeds a certain value, the present invention relates to a method for preventing spontaneous ignition of pulverized coal. Concerning methods for preventing spontaneous ignition of charcoal.
従来、微粉炭を空気輸送により長距離にわたり
輸送する際には、微粉炭貯槽から供給タンクへ微
粉炭を送入したのち、供給タンクを輸送管内と同
一の高圧となし、ロータリバルブにより微粉炭を
供給タンクから輸送管内へ切り出して、高圧空気
により輸送することが行なわれている。この従来
方法では、微粉炭貯槽に多量の微粉炭を長期間貯
留する場合に、微粉炭の酸化による反応熱が蓄積
して次第に温度が上昇し、自然発火する恐れがあ
つた。 Conventionally, when transporting pulverized coal over long distances by pneumatic transportation, the pulverized coal was fed from the pulverized coal storage tank to the supply tank, the supply tank was brought to the same high pressure as the inside of the transport pipe, and the pulverized coal was transported using a rotary valve. The material is cut out from a supply tank into a transport pipe and transported using high-pressure air. In this conventional method, when a large amount of pulverized coal is stored in a pulverized coal storage tank for a long period of time, reaction heat due to oxidation of the pulverized coal accumulates and the temperature gradually rises, leading to the risk of spontaneous combustion.
従来、この自然発火を防止する方法としては、
微粉炭貯槽内に不活性ガスを常時吹き込むことが
行なわれている。しかしながら、この方法は多量
の不活性ガスを必要とし、不経済であるという次
点を有していた。 Traditionally, the methods to prevent this spontaneous combustion are as follows:
Inert gas is constantly blown into the pulverized coal storage tank. However, this method requires a large amount of inert gas and is uneconomical.
一方、微粉炭貯槽内の温度を検出し、この温度
が微粉炭の発火温度である180〜250℃に達する前
に不活性ガスを送入する方法もある。 On the other hand, there is also a method in which the temperature inside the pulverized coal storage tank is detected and inert gas is introduced before this temperature reaches 180 to 250°C, which is the ignition temperature of the pulverized coal.
しかしながら、微粉炭貯槽内には温度分布があ
るため、最高温度を検出することがきわめて難し
く、従つてこの方法も満足すべきものではない。 However, since there is a temperature distribution within the pulverized coal storage tank, it is extremely difficult to detect the maximum temperature, and therefore this method is not satisfactory.
本発明の目的は、上記従来方法の欠点を解消
し、不活性ガスを多量に使用せず、しかも確実に
微粉炭の自然発火を防止する方法を提供すること
にある。 An object of the present invention is to provide a method that eliminates the drawbacks of the conventional methods described above, does not use a large amount of inert gas, and reliably prevents spontaneous combustion of pulverized coal.
本発明は、微粉炭の温度上昇が微粉炭と酸素と
の発熱反応において酸素の供給律速であることに
着目してなされたものである。すなわち、微粉炭
の空気輸送に際しては、微粉炭貯槽の下部に設置
した供給タンクが高圧であるため、空気がバルブ
から漏れて微粉炭貯槽内に流入し、微粉炭が部分
酸化し、このため微粉炭の温度が酸化熱の蓄積に
より、時間と共に上昇する。しかしながら、本発
明者らの知見によれば、高温では酸素の消費速度
が速くなるため、流入する空気の流速が例えば１
ｍ／ｈの条件では約２時間後に貯槽内部の酸素が
なくなり、発熱しなくなる。またこの際空気の一
成分である窒素ガスにより冷却されたり、外気と
の温度勾配が大きくなり、貯槽壁からの放熱も大
となるため、微粉炭の温度は平衡となり、例えば
約80℃と一定となる。この温度は微粉炭の発火温
度180℃より低いため自然発火には到らない。 The present invention was made based on the fact that the temperature rise of pulverized coal is the rate-determining rate of oxygen supply in the exothermic reaction between pulverized coal and oxygen. In other words, when transporting pulverized coal by air, the supply tank installed at the bottom of the pulverized coal storage tank is under high pressure, so air leaks from the valve and flows into the pulverized coal storage tank, causing partial oxidation of the pulverized coal. The temperature of the charcoal increases over time due to the accumulation of oxidation heat. However, according to the findings of the present inventors, the rate of oxygen consumption increases at high temperatures, so the flow rate of the incoming air is reduced to 1, for example.
m/h condition, the oxygen inside the storage tank disappears after about 2 hours and no heat is generated. In addition, at this time, the temperature of the pulverized coal becomes equilibrium and remains constant at about 80°C, for example, because it is cooled by nitrogen gas, which is a component of the air, and the temperature gradient with the outside air becomes large, and the heat radiation from the storage tank wall becomes large. becomes. This temperature is lower than the ignition temperature of pulverized coal, 180°C, so spontaneous combustion does not occur.
本発明者らは、このように微粉炭貯槽下部の空
気の流速が一定値以下の場合には酸素の供給が不
足し、自然発火しないことを見出し、この知見に
基づいて本発明を完成した。 The inventors of the present invention discovered that when the flow velocity of the air at the bottom of the pulverized coal storage tank is below a certain value, the supply of oxygen is insufficient and spontaneous combustion does not occur, and the present invention was completed based on this knowledge.
本発明は、微粉炭貯槽の下部にバルブを介して
設置した供給タンクから、微粉炭をロータリバル
ブにより切り出して空気輸送するに際し、供給タ
ンク内の高圧空気がバルブから漏れる漏出量を、
微粉炭貯槽とバルブとの間に設置した検出器で検
出し、該漏出量が一定値を越える場合に微粉炭貯
槽とバルブとの間に不活性ガスを送入することを
特徴とする、微粉炭の自然発火防止方法である。 The present invention aims to reduce the amount of high-pressure air in the supply tank that leaks from the valve when pulverized coal is cut out by a rotary valve and transported by air from a supply tank installed at the bottom of a pulverized coal storage tank via a valve.
The pulverized coal is detected by a detector installed between the pulverized coal storage tank and the valve, and when the amount of leakage exceeds a certain value, an inert gas is introduced between the pulverized coal storage tank and the valve. This is a method to prevent spontaneous combustion of charcoal.
上記漏出量の検出は、例えば微粉炭貯槽と、そ
の下部のバルブとの間での空気圧や流速等を検出
することにより行なわれる。 The amount of leakage is detected by, for example, detecting the air pressure, flow rate, etc. between the pulverized coal storage tank and a valve located below the pulverized coal storage tank.
本発明方法は、上記漏出量が一定値を越える場
合に、不活性ガスを送入してバルブからの漏れ空
気を遮断すると同時に、微粉炭貯槽内への酸素の
流入を防止して発熱反応を阻止し、さらに不活性
ガスにより微粉炭を冷却するようにしたものであ
る。 In the method of the present invention, when the amount of leakage exceeds a certain value, inert gas is introduced to block the air leaking from the valve, and at the same time, the flow of oxygen into the pulverized coal storage tank is prevented to prevent an exothermic reaction. In addition, the pulverized coal is cooled by inert gas.
以下、本発明を図面によりさらに詳細に説明す
る。 Hereinafter, the present invention will be explained in more detail with reference to the drawings.
第１図は、本発明方法の一実施例を示す装置系
統図である。図において、微粉炭１を貯蔵する微
粉炭貯槽２，供給タンク３，前記微粉炭貯槽と供
給タンクの間に二重に設置されたバルブ４，バル
ブ４Ａ，供給タンク下部に設けられたロータリバ
ルブ５，ロータリバルブ下部のバルブ６，輸送管
７，コンプレツサ８，流速検出器９，制御器１
０，不活性ガス導入管１１および制御バルブ１２
からなる。 FIG. 1 is an apparatus system diagram showing an embodiment of the method of the present invention. In the figure, a pulverized coal storage tank 2 that stores pulverized coal 1, a supply tank 3, a valve 4 and a valve 4A installed in a double manner between the pulverized coal storage tank and the supply tank, and a rotary valve 5 installed at the bottom of the supply tank. , valve 6 at the bottom of the rotary valve, transport pipe 7, compressor 8, flow rate detector 9, controller 1
0, inert gas introduction pipe 11 and control valve 12
Consisting of
微粉炭１は微粉炭貯槽２から、バルブ４および
バルブ４Ａを開けることにより供給タンク３内に
供給され、一時貯留される。次いでバルブ４およ
び４Ａを閉じて、ロータリバルブ下部のバルブ６
を開けて、輸送管７内と供給タンク３内を同一の
圧力としたのち、微粉炭１をロータリバルブ５に
より、輸送管７内に切り出して、コンプレツサ８
からの高圧空気により輸送する。 Pulverized coal 1 is supplied from pulverized coal storage tank 2 into supply tank 3 by opening valve 4 and valve 4A, and is temporarily stored therein. Then, close valves 4 and 4A, and close valve 6 at the bottom of the rotary valve.
After opening the transport pipe 7 and the supply tank 3 to make the pressure the same, the pulverized coal 1 is cut into the transport pipe 7 by the rotary valve 5, and the compressor 8
Transport by high pressure air from
この輸送管７は通常数Kmと長いため、その圧力
損失により、供給タンク内が数Kg／cm2Ｇの高圧と
なり、その結果、その上部に設置したバルブ４お
よび４Ａから空気が漏出する。この際、バルブ４
および４Ａは微粉炭のかみ込み等によつて摩耗す
るため、供給タンク３からの空気の漏出をシール
することができない。 Since this transport pipe 7 is usually long, several kilometers long, the pressure loss causes a high pressure in the supply tank of several kg/cm 2 G, and as a result, air leaks from the valves 4 and 4A installed above the supply tank. At this time, valve 4
and 4A are worn out due to entrainment of pulverized coal, etc., so that leakage of air from the supply tank 3 cannot be sealed.
そこで本発明方法においては、バルブから漏出
する空気の流速を流速検出器９で検出し、その値
が設定値を越えた場合には、制御器１０により設
定値に近ずくように制御バルブ１２を開け、不活
性ガス導入管１１から窒素ガス等の不活性ガスを
微粉炭貯槽２内に送入して、微粉炭の発熱を防止
する。この間の適当な時期にバルブ４を閉じて、
バルブ４Ａのシール性を改善し、以後、不活性ガ
スを送入しない通常の運転に切替える。 Therefore, in the method of the present invention, the flow velocity of the air leaking from the valve is detected by the flow velocity detector 9, and when the detected value exceeds the set value, the control valve 12 is adjusted by the controller 10 so as to approach the set value. The tank is opened and an inert gas such as nitrogen gas is introduced into the pulverized coal storage tank 2 from the inert gas introduction pipe 11 to prevent the pulverized coal from generating heat. Close valve 4 at an appropriate time during this period,
Improve the sealing performance of valve 4A, and then switch to normal operation without feeding inert gas.
以上、本発明方法によれば、微粉炭の自然発火
を防止するために常時微粉炭貯槽内に不活性ガス
を吹き込んでいた従来法と異なり、上記のように
空気の漏出量が一定値を越えたときのみ不活性ガ
スを送入するため、不活性ガスを多量に使用する
必要がなく、経済的であり、しかも確実に自然発
火を防止することができる。 As described above, according to the method of the present invention, unlike the conventional method in which inert gas is constantly blown into the pulverized coal storage tank to prevent spontaneous combustion of pulverized coal, the amount of air leakage exceeds a certain value as described above. Since the inert gas is introduced only when the combustion occurs, there is no need to use a large amount of the inert gas, which is economical, and spontaneous combustion can be reliably prevented.
第１図は本発明の一実施例を示す装置系統図で
ある。
２……微粉炭貯槽、３……供給タンク、４……
バルブ、５……ロータリバルブ、７……輸送管、
９……流速検出器、１０……制御器、１１……不
活性ガス導入管、１２……制御バルブ。
FIG. 1 is a system diagram of an apparatus showing an embodiment of the present invention. 2...Pulverized coal storage tank, 3...Supply tank, 4...
Valve, 5... Rotary valve, 7... Transport pipe,
9...Flow rate detector, 10...Controller, 11...Inert gas introduction pipe, 12...Control valve.
Claims (1)
供給タンクから、微粉炭をロータリバルブにより
切り出して空気輸送するに際し、供給タンク内の
高圧空気がバルブから漏れる漏出量を、微粉炭貯
槽とバルブとの間に設置した検出器で検出し、該
漏出量が一定値を越える場合に微粉炭貯槽とバル
ブとの間に不活性ガスを送入することを特徴とす
る、微粉炭の自然発火防止方法。1. When pulverized coal is cut out by a rotary valve from a supply tank installed via a valve at the bottom of the pulverized coal storage tank and transported by air, the leakage amount of high-pressure air in the supply tank from the valve is calculated between the pulverized coal storage tank and the valve. A method for preventing spontaneous ignition of pulverized coal, characterized by detecting it with a detector installed between the pulverized coal storage tank and the valve, and injecting an inert gas between the pulverized coal storage tank and the valve when the amount of leakage exceeds a certain value. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57137276A JPS5927991A (en) | 1982-08-09 | 1982-08-09 | Prevention of spontaneous ignition of slack coal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57137276A JPS5927991A (en) | 1982-08-09 | 1982-08-09 | Prevention of spontaneous ignition of slack coal |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5927991A JPS5927991A (en) | 1984-02-14 |
| JPS636434B2 true JPS636434B2 (en) | 1988-02-09 |
Family
ID=15194886
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57137276A Granted JPS5927991A (en) | 1982-08-09 | 1982-08-09 | Prevention of spontaneous ignition of slack coal |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5927991A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0363130U (en) * | 1989-10-26 | 1991-06-20 | ||
| JPH0530845U (en) * | 1991-10-03 | 1993-04-23 | コニカ株式会社 | Simple camera |
| US9290711B2 (en) | 2010-12-17 | 2016-03-22 | Mitsubishi Heavy Industries, Ltd. | Coal deactivation apparatus |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113042188A (en) * | 2021-03-08 | 2021-06-29 | 碎得机械(北京)有限公司 | Double-door sealed bin system |
-
1982
- 1982-08-09 JP JP57137276A patent/JPS5927991A/en active Granted
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0363130U (en) * | 1989-10-26 | 1991-06-20 | ||
| JPH0530845U (en) * | 1991-10-03 | 1993-04-23 | コニカ株式会社 | Simple camera |
| US9290711B2 (en) | 2010-12-17 | 2016-03-22 | Mitsubishi Heavy Industries, Ltd. | Coal deactivation apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5927991A (en) | 1984-02-14 |
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