JPH04340010A - Method of burning pulverized coal using pulverized coal and oxygen burner - Google Patents
Method of burning pulverized coal using pulverized coal and oxygen burnerInfo
- Publication number
- JPH04340010A JPH04340010A JP11198291A JP11198291A JPH04340010A JP H04340010 A JPH04340010 A JP H04340010A JP 11198291 A JP11198291 A JP 11198291A JP 11198291 A JP11198291 A JP 11198291A JP H04340010 A JPH04340010 A JP H04340010A
- Authority
- JP
- Japan
- Prior art keywords
- pulverized coal
- combustion
- oxygen
- gas
- oxygen burner
- 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.)
- Pending
Links
- 239000003245 coal Substances 0.000 title claims abstract description 76
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 48
- 239000001301 oxygen Substances 0.000 title claims abstract description 48
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 48
- 238000000034 method Methods 0.000 title claims abstract description 5
- 238000002485 combustion reaction Methods 0.000 claims abstract description 49
- 239000007789 gas Substances 0.000 claims abstract description 40
- 239000012159 carrier gas Substances 0.000 claims abstract description 15
- 238000009841 combustion method Methods 0.000 claims description 11
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 abstract description 22
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 abstract description 15
- 229910002092 carbon dioxide Inorganic materials 0.000 abstract description 11
- 239000001569 carbon dioxide Substances 0.000 abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 17
- 239000000567 combustion gas Substances 0.000 description 7
- 239000000446 fuel Substances 0.000 description 6
- 238000011084 recovery Methods 0.000 description 5
- 230000008018 melting Effects 0.000 description 4
- 238000002844 melting Methods 0.000 description 4
- 239000002184 metal Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 238000010248 power generation Methods 0.000 description 3
- 238000007670 refining 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
- 230000005611 electricity Effects 0.000 description 2
- 239000000295 fuel oil Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000003949 liquefied natural gas Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 238000010792 warming Methods 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- 239000003034 coal gas Substances 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 239000003915 liquefied petroleum gas Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Abstract
Description
【０００１】0001
【産業上の利用分野】本発明は、燃料に微粉炭を、助燃
ガスに酸素を使用する微粉炭・酸素バーナーを用いた微
粉炭燃焼方法に関し、詳しくは、金属の精錬炉，溶解炉
，発電用ボイラー等における微粉炭燃焼方法に関する。[Industrial Application Field] The present invention relates to a pulverized coal combustion method using a pulverized coal/oxygen burner that uses pulverized coal as a fuel and oxygen as an auxiliary gas. This paper relates to a pulverized coal combustion method in commercial boilers, etc.
【０００２】0002
【従来の技術】金属の溶解や精錬において、より高温で
の急速溶解や効率的な精錬を行うために、酸素・燃料バ
ーナーが用いられて来たが、従来は、その殆どが燃料と
して重油が用いられており、まれに液化天然ガスやＬＰ
Ｇが用いられていた。[Prior Art] Oxygen/fuel burners have been used in the melting and refining of metals to achieve rapid melting at higher temperatures and efficient refining. Conventionally, most burners used heavy oil as fuel. Liquefied natural gas and LP are used in rare cases.
G was used.
【０００３】近年、重油，ＬＮＧ，ＬＰＧに代えて石炭
を微粉炭にして燃焼する技術が注目され、上記の金属の
精錬や溶解にも用いられてきている。一方、火力発電用
ボイラー用の加熱源としては、従来から使用されてきて
いる。しかし、これらいずれの場合にも、助燃ガスは空
気であり、燃焼生成ガスはそのまま大気に放出されてい
た。さらに、近年微粉炭を燃焼する際に、助燃ガスに酸
素を用いて燃焼温度及び燃焼速度の上昇と完全燃焼を図
り、熱効率を高める技術が開発されている。[0003] In recent years, the technology of burning coal in the form of pulverized coal instead of heavy oil, LNG, or LPG has attracted attention, and has also been used for refining and melting the above-mentioned metals. On the other hand, it has been used as a heating source for boilers for thermal power generation. However, in all of these cases, the auxiliary combustion gas was air, and the combustion generated gas was released into the atmosphere as it was. Furthermore, in recent years, when pulverized coal is combusted, a technique has been developed that uses oxygen as an auxiliary gas to increase the combustion temperature and combustion speed and achieve complete combustion, thereby increasing thermal efficiency.
【０００４】0004
【発明が解決しようとする課題】酸素を助燃ガスとした
場合の燃焼生成ガスは、その大部分が二酸化炭素であり
かつ高温のまま大気に放出されて、ガスとしてもエネル
ギーとしても十分な回収利用はなされてなかった。最近
は、この二酸化炭素が大気中の含有量の増加をもたらし
て地球温暖化を引き起こし、環境問題として論議をよん
でいる。また燃料の微粉炭は、通常、フィーダーより窒
素等の不活性ガス又は空気を搬送ガスとしてバーナーに
供給しているため、これが炉内で燃焼生成ガスを希釈し
て熱を系外へ排出し、かつ有害な窒素酸化物を発生させ
る原因のひとつになっている。[Problem to be solved by the invention] When oxygen is used as a combustion assisting gas, the combustion generated gas is mostly carbon dioxide and is released into the atmosphere at a high temperature, so it is difficult to recover and use it sufficiently as both gas and energy. It wasn't talked about. Recently, this carbon dioxide has become a hot topic of discussion as an environmental issue, as its content in the atmosphere has increased, causing global warming. In addition, the pulverized coal used as fuel is normally supplied to the burner from a feeder using an inert gas such as nitrogen or air as a carrier gas, which dilutes the combustion generated gas in the furnace and discharges heat to the outside of the system. It is also one of the causes of harmful nitrogen oxides.
【０００５】そこで本発明は、これらの無駄を無くし、
熱効率の一層の向上と、生成する二酸化炭素及び排熱を
回収利用し、また窒素酸化物の発生を減少できる微粉炭
・酸素バーナーを用いた微粉炭燃焼方法を提供すること
を目的としている。[0005] Therefore, the present invention eliminates these wastes and
The purpose of the present invention is to provide a pulverized coal combustion method using a pulverized coal/oxygen burner that can further improve thermal efficiency, recover and utilize generated carbon dioxide and waste heat, and reduce the generation of nitrogen oxides.
【０００６】[0006]
【課題を解決するための手段】上記した目的を達成する
ため、本発明の微粉炭・酸素バーナーを用いた微粉炭燃
焼方法は、第１の構成として、燃焼炉等に微粉炭・酸素
バーナーを設置して燃焼せしめる微粉炭燃焼方法におい
て、前記微粉炭・酸素バーナーの燃焼生成ガスの少なく
とも一部を、微粉炭の搬送ガスとして用いることを特徴
とし、第２の構成として、第１の構成における前記微粉
炭搬送ガスとしての燃焼生成ガスを、昇温状態、好まし
くは１００〜３００℃の範囲で用いることを特徴とし、
さらに第３の構成として、第１の構成における前記微粉
炭・酸素バーナーの燃焼生成ガスの少なくとも一部によ
り、微粉炭・酸素バーナーに供給する酸素を、好ましく
は２００〜１０００℃の範囲に加熱昇温することを特徴
としている。[Means for Solving the Problems] In order to achieve the above-mentioned object, the pulverized coal combustion method using a pulverized coal/oxygen burner of the present invention includes, as a first configuration, a pulverized coal/oxygen burner in a combustion furnace or the like. In the pulverized coal combustion method in which the pulverized coal is installed and combusted, at least a part of the combustion generated gas of the pulverized coal/oxygen burner is used as a carrier gas for the pulverized coal, and as a second configuration, the method according to the first configuration is used. The combustion product gas as the pulverized coal carrier gas is used at an elevated temperature, preferably in the range of 100 to 300°C,
Further, as a third configuration, oxygen supplied to the pulverized coal/oxygen burner is heated to a temperature preferably in the range of 200 to 1000°C by at least a portion of the combustion generated gas of the pulverized coal/oxygen burner in the first configuration. It is characterized by heating.
【０００７】[0007]
【作 用】上記構成によれば、微粉炭の搬送ガスとし
て燃焼生成ガスを用い、助燃ガスとして酸素を用いるの
で、高濃度の二酸化炭素の回収が容易である。燃焼生成
ガス量が少なく、また排煙量が少なく、熱回収率が高い
上、窒素酸化物の発生をも減少させることができる。さ
らに上記双方のガスを昇温状態で用いるので高温火炎が
得られる。[Function] According to the above structure, since combustion generated gas is used as the carrier gas for pulverized coal and oxygen is used as the auxiliary combustion gas, high concentration carbon dioxide can be easily recovered. The amount of combustion generated gas is small, the amount of exhaust gas is small, the heat recovery rate is high, and the generation of nitrogen oxides can be reduced. Furthermore, since both of the above gases are used at elevated temperatures, a high temperature flame can be obtained.
【０００８】[0008]
【実施例】以下、本発明を、図面に示す一実施例に基づ
いて、さらに詳細に説明する。図は微粉炭・酸素バーナ
ーをボイラーに用い、スチームタービンによる発電を行
う場合の概略系統図である。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be explained in more detail below based on an embodiment shown in the drawings. The figure is a schematic diagram of a system in which a pulverized coal/oxygen burner is used in a boiler and a steam turbine is used to generate electricity.
【０００９】図において、１は火炉で、複数本の微粉炭
・酸素バーナー２が設けられている。この微粉炭・酸素
バーナー２には、経路３，３’ からの微粉炭と、経路
４からの酸素が導入され、バーナー先端部で混合して燃
焼する。経路３，３’ を経て導入される微粉炭は、微
粉炭機付属の微粉炭供給器５から、又は微粉炭貯槽に蓄
えた微粉炭を微粉炭フィーダーにより後記する燃焼生成
ガスを搬送ガスとして搬送されてくる。In the figure, reference numeral 1 denotes a furnace, and a plurality of pulverized coal/oxygen burners 2 are provided. Pulverized coal from paths 3 and 3' and oxygen from path 4 are introduced into this pulverized coal/oxygen burner 2, mixed at the tip of the burner, and combusted. The pulverized coal introduced through the routes 3 and 3' is transported from the pulverized coal feeder 5 attached to the pulverized coal machine, or the pulverized coal stored in the pulverized coal storage tank is conveyed by a pulverized coal feeder using combustion generated gas as described later as a carrier gas. It will be done.
【００１０】微粉炭・酸素燃焼炎は、後記するように、
酸素及び微粉炭，搬送ガスの温度により、２０００〜２
８００℃程度に達するが、燃焼生成ガスは、蒸発器６，
過熱器７，再熱器８，節炭器９等の熱交換器で熱交換を
行い、これら熱交換器内の水又は水蒸気を加熱し、自身
は降温して火炉出口１０に至る。[0010] As described later, the pulverized coal/oxygen combustion flame
2000 to 2 depending on the temperature of oxygen, pulverized coal, and carrier gas
The temperature reaches about 800°C, but the combustion generated gas flows through the evaporator 6,
Heat exchange is performed by heat exchangers such as a superheater 7, a reheater 8, and a coal saver 9, and the water or steam in these heat exchangers is heated, and the temperature of the water or steam decreases and reaches the furnace outlet 10.
【００１１】また、微粉炭・酸素燃焼炎は、前述のよう
に２千数百℃にも達するので、火炉１の内壁及び前記の
各種熱交換を、この雰囲気に十分耐え得る材質にすると
ともに、定常運転時は、温度調整用として炉内ガスの一
部を火炉１内に戻し、また後記する予熱用熱交換器１１
を経て循環させて炉内温度を調節する。即ち、適当な耐
高温材料を使用することにより、ボイラー全体をコンパ
クトに構成することができ、また前記節炭器９等で熱交
換により降温した二酸化炭素を主成分とする炉内ガスを
経路１２より導出し、ブロワー１３で送風して炉底部１
４より火炉１内に導入し、微粉炭・酸素燃焼炎と混合さ
せることにより、炉内温度を最適に制御し、同時に熱回
収率の向上を図っている。In addition, since the pulverized coal/oxygen combustion flame reaches a temperature of 2,000-odd degrees Celsius as mentioned above, the inner wall of the furnace 1 and the various heat exchangers mentioned above are made of materials that can withstand this atmosphere sufficiently. During steady operation, a part of the furnace gas is returned to the furnace 1 for temperature adjustment, and a preheating heat exchanger 11 (described later) is used.
The temperature inside the furnace is adjusted by circulating it through the furnace. That is, by using an appropriate high temperature resistant material, the entire boiler can be constructed compactly, and the furnace gas whose main component is carbon dioxide, whose temperature has been lowered by heat exchange in the economizer 9 etc., can be transferred to the path 12. The blower 13 blows air through the furnace bottom 1.
4 into the furnace 1 and mixed with the pulverized coal and oxygen combustion flame, the temperature inside the furnace is optimally controlled and at the same time the heat recovery rate is improved.
【００１２】微粉炭・酸素燃焼により生成した、大部分
が二酸化炭素の燃焼生成ガスと上記循環ガスの一部は、
前記火炉出口１０より経路１５に導出されてブロワー１
６で昇圧され、前記予熱用熱交換器（以下、予熱器と称
す）１１に導入され、向流する助燃用酸素及び搬送用燃
焼生成ガスを加温して燃焼生成ガスは降温し、少量の含
有水蒸気は凝縮して該予熱器１１を導出し、気水分離器
１７に入り、水を分離する。[0012] Combustion gas, mostly carbon dioxide, produced by pulverized coal/oxygen combustion and a part of the above-mentioned circulating gas,
The blower 1 is led out from the furnace outlet 10 to a path 15.
6, the pressure is increased in the preheating heat exchanger (hereinafter referred to as preheater) 11, and the combustion auxiliary oxygen and the combustion generated gas for conveyance flowing countercurrently are heated, the temperature of the combustion generated gas is lowered, and a small amount of The contained steam condenses and leaves the preheater 11 and enters the steam/water separator 17 to separate water.
【００１３】該気水分離器１７で水を分離した燃焼生成
ガスは、分岐してその一方が経路１８，経路１９を経て
予熱器１１に再び導入され、搬送ガスとして加温され、
経路２０へ導出して前記微粉炭供給器５へ入り、微粉炭
を同伴して前記経路３，３’より各バーナー２，２に導
入される。この搬送ガスの温度は、温度調節用バイパス
経路２１よりのガスと混合後、約１００〜３００℃に調
節することが好ましい。The combustion generated gas from which water has been separated in the steam/water separator 17 is branched, and one of them is reintroduced to the preheater 11 via a path 18 and a path 19, where it is heated as a carrier gas.
The pulverized coal is led out to the path 20, enters the pulverized coal feeder 5, and is introduced into each burner 2, 2 through the paths 3, 3' along with the pulverized coal. The temperature of this carrier gas is preferably adjusted to about 100 to 300° C. after being mixed with the gas from the temperature regulating bypass path 21.
【００１４】気水分離器１７導出後に分岐した他方の燃
焼生成ガスは、経路２２より二酸化炭素として回収され
、用途に応じて精製等の処理工程を経て製品となる。[0014] The other combustion generated gas that is branched after being discharged from the steam/water separator 17 is recovered as carbon dioxide through a path 22 and becomes a product through processing steps such as purification depending on the purpose.
【００１５】経路２３から供給される助燃用の酸素は、
前記予熱器１１での熱交換により２００〜１０００℃に
昇温され、前記経路４を経てバーナー２，２に導入され
、微粉炭・酸素燃焼炎を形成するが、この時の予熱温度
により、通常火炎より高い燃焼温度，高い燃焼速度が確
保される。The auxiliary combustion oxygen supplied from the path 23 is
The temperature is raised to 200 to 1000°C by heat exchange in the preheater 11, and introduced into the burners 2, 2 via the path 4 to form a pulverized coal/oxygen combustion flame. A higher combustion temperature and higher combustion rate than flame are ensured.
【００１６】燃焼生成ガスの経路２１，２４は，温度調
節用バイパス経路であり、弁２５，２６は，その調節弁
である。本微粉炭・酸素燃焼方式では、供給酸素１モル
に対して燃焼生成ガスも約１モル乃至１．数モルである
が、燃焼生成ガスの温度，供給する酸素の温度，前記温
調用循環ガスの量，搬送ガスの量，温度等他の条件の選
び方によって、予熱器１１の燃焼生成ガス流路を通るガ
ス量あるいは搬送ガス量を調節する必要があるため、上
記バイパス経路２１，２４を設ける。また経路２７は、
同様炉内温度調節用の予熱器１１を経た燃焼生成ガスの
循環用経路である。The combustion gas paths 21 and 24 are temperature control bypass paths, and the valves 25 and 26 are control valves thereof. In this pulverized coal/oxygen combustion method, the amount of combustion generated gas is approximately 1 mol to 1.0 mol per 1 mol of oxygen supplied. Although it is several moles, the combustion gas flow path of the preheater 11 can be adjusted depending on the selection of other conditions such as the temperature of the combustion gas, the temperature of the oxygen to be supplied, the amount of the circulating gas for temperature control, the amount of the carrier gas, and the temperature. Since it is necessary to adjust the amount of passing gas or the amount of carrier gas, the bypass paths 21 and 24 are provided. Also, route 27 is
Similarly, it is a circulation path for combustion generated gas that has passed through a preheater 11 for controlling the temperature inside the furnace.
【００１７】なお、これらの循環ガスの量は、ブロワー
１３，１６双方併せて燃焼生成ガスの２乃至５倍程度で
ある。Note that the amount of these circulating gases in both blowers 13 and 16 is approximately 2 to 5 times the amount of combustion generated gas.
【００１８】次にスチームの経路を説明する。気水ドラ
ム３０から導出した水は，経路３１を経て循環ポンプ３
２により火炉１内の蒸発管６に導入され，前記微粉炭・
酸素バーナー２，２の燃焼炎により加熱されて水蒸気と
なり、一度火炉１から導出して気水ドラム３０に入り、
経路３３を経て前記過熱器７で再度昇温して導出し、経
路３４から高圧タービン３５へ導入され、該高圧タービ
ン３５を駆動する。Next, the steam path will be explained. The water drawn out from the air-water drum 30 passes through a path 31 to the circulation pump 3.
2, the pulverized coal is introduced into the evaporation tube 6 in the furnace 1, and the pulverized coal
It is heated by the combustion flames of the oxygen burners 2, 2 and turns into water vapor, which is once drawn out from the furnace 1 and enters the steam-water drum 30.
It passes through the path 33, is heated again in the superheater 7, and is led out, and is introduced into the high-pressure turbine 35 through the path 34, and drives the high-pressure turbine 35.
【００１９】高圧タービン３５を導出した水蒸気は、経
路３６から前記再熱器８に導入され、再び昇温して経路
３７へ導出し、低圧タービン３８を駆動して発電機３９
により発電を行う。The water vapor led out of the high-pressure turbine 35 is introduced into the reheater 8 through a path 36, heated again, and led out into a path 37, which drives a low-pressure turbine 38 to generate a generator 39.
generates electricity.
【００２０】低圧タービン３８を導出したスチームは、
経路４０を経て復水器４１に入り復水し、給水ポンプ４
２により経路４３から前記節炭器９に導入され、再度昇
温して経路４４より前記気水ドラム３０に導入され、上
記経路を順次循環する。[0020] The steam led out to the low pressure turbine 38 is
The water enters the condenser 41 via the path 40 and is condensed, and then flows to the water supply pump 4.
2, the air is introduced into the economizer 9 through a path 43, heated again, and introduced into the air-water drum 30 through a path 44, where it is sequentially circulated through the path.
【００２１】また詳細図示説明は省略するが、高圧ター
ビン３５の出口経路３６には高圧給水加熱器を、低圧タ
ービン３８の出口経路４０には低圧給水加熱器を設けて
排熱回収を行う。Although detailed illustrations and explanations are omitted, a high-pressure feedwater heater is provided in the outlet path 36 of the high-pressure turbine 35, and a low-pressure feedwater heater is provided in the outlet path 40 of the low-pressure turbine 38 to recover exhaust heat.
【００２２】このように、再熱器７，過熱器８，節炭器
９等の熱交換器の他に予熱器１１を設けて排熱回収を十
分に行うとともに、該予熱器１１で燃焼生成ガスにより
微粉炭搬送ガス，微粉炭及び助燃用酸素を予熱して微粉
炭の完全燃焼、高温燃焼を行い、そして燃焼生成ガス自
身で微粉炭を搬送することにより、ＮＯＸ の減少を図
っており、さらに上記のように燃焼生成ガスを循環又は
バイパスさせて最適温度調整と熱回収率の向上を図って
いる。In this way, in addition to the heat exchangers such as the reheater 7, the superheater 8, and the economizer 9, the preheater 11 is provided to sufficiently recover exhaust heat, and the preheater 11 also generates combustion. By preheating the pulverized coal carrier gas, pulverized coal, and auxiliary combustion oxygen using gas to achieve complete combustion and high-temperature combustion of the pulverized coal, and by transporting the pulverized coal using the combustion generated gas itself, we aim to reduce NOx. Further, as described above, the combustion generated gas is circulated or bypassed to achieve optimum temperature control and improve the heat recovery rate.
【００２３】従って、極めて高い熱回収率でボイラーの
運転を行い、高熱効率の発電を可能にできる。また、排
煙量が少ない上、高濃度の二酸化炭素であるので、次工
程の二酸化炭素の回収，精製が容易である。[0023] Therefore, the boiler can be operated at an extremely high heat recovery rate, making it possible to generate power with high thermal efficiency. Furthermore, since the amount of exhaust gas is small and the carbon dioxide is highly concentrated, it is easy to recover and purify the carbon dioxide in the next step.
【００２４】なお、上記実施例は、発電用ボイラーの場
合の例であるが、本発明はこれに限らず、金属の精錬炉
，溶解炉等における微粉炭・酸素バーナーの適用に際し
ても同様に用いることができることは勿論である。[0024] Although the above embodiment is an example of a power generation boiler, the present invention is not limited thereto, and can be similarly applied to a pulverized coal/oxygen burner in a metal smelting furnace, melting furnace, etc. Of course it is possible.
【００２５】[0025]
【発明の効果】以上説明したように、本発明の微粉炭・
酸素バーナーを用いた微粉炭燃焼方法は、微粉炭を燃料
とする燃焼装置において、微粉炭の搬送ガスとして燃焼
生成ガスを用い、助燃ガスとして酸素を用いるので排煙
量が著しく少なく、熱回収率が高い上、窒素酸化物の発
生を低減できる。また燃焼生成ガスは、高濃度の二酸化
炭素なので、回収，精製が極めて容易であり、地球温暖
化対策上からもその効果は大きい。[Effect of the invention] As explained above, the pulverized coal of the present invention
The pulverized coal combustion method using an oxygen burner is a combustion device that uses pulverized coal as fuel, and uses combustion generated gas as a carrier gas for pulverized coal and oxygen as an auxiliary combustion gas, so the amount of exhaust smoke is extremely small and the heat recovery rate is high. In addition to being high, the generation of nitrogen oxides can be reduced. Furthermore, since the combustion generated gas is highly concentrated carbon dioxide, it is extremely easy to recover and purify, and it is also highly effective in terms of global warming countermeasures.
【００２６】さらに、予熱器を設けて排熱を回収すると
ともに、燃料系や助燃用酸素を昇温した後、燃焼させる
ので高温火炎が得られる。従って装置がコンパクトにな
る上、さらに高い熱効率が得られる。Furthermore, a preheater is provided to recover exhaust heat, and the fuel system and auxiliary combustion oxygen are heated and then combusted, so that a high-temperature flame can be obtained. Therefore, not only the device becomes more compact, but also higher thermal efficiency can be obtained.
【図１】 本発明をスチームタービン発電用ボイラー
に適用した一実施例を示す系統図である。FIG. 1 is a system diagram showing an embodiment in which the present invention is applied to a boiler for steam turbine power generation.
【符号の説明】
１…火炉 ２…微粉炭・酸素バーナー ５
…微粉炭供給器 ６…蒸発器
７…過熱器 ８…再熱器 ９…節炭器
１０…火炉出口 １１…予熱用
熱交換器 １７…気水分離器 ３０…気水
ドラム ３５…高圧タービン[Explanation of symbols] 1... Furnace 2... Pulverized coal/oxygen burner 5
...Pulverized coal feeder 6...Evaporator 7...Superheater 8...Reheater 9...Coal economizer
10... Furnace outlet 11... Preheating heat exchanger 17... Steam-water separator 30... Steam-water drum 35... High-pressure turbine
Claims (3)
を燃焼せしめる燃焼方法において、前記微粉炭・酸素バ
ーナーの燃焼生成ガスの少なくとも一部を、微粉炭の搬
送ガスとして用いることを特徴とする微粉炭・酸素バー
ナーを用いた微粉炭燃焼方法。1. A combustion method for combusting pulverized coal using a pulverized coal/oxygen burner, characterized in that at least a part of the combustion generated gas of the pulverized coal/oxygen burner is used as a carrier gas for the pulverized coal. Pulverized coal combustion method using pulverized coal and oxygen burner.
ガスを、昇温状態で用いることを特徴とする請求項１記
載の微粉炭・酸素バーナーを用いた微粉炭燃焼方法。2. The pulverized coal combustion method using a pulverized coal/oxygen burner according to claim 1, wherein the combustion generated gas as the pulverized coal carrier gas is used at an elevated temperature.
ガスの少なくとも一部により、微粉炭・酸素バーナーに
供給する酸素を加熱昇温することを特徴とする請求項１
記載の微粉炭・酸素バーナーを用いた微粉炭燃焼方法。3. The method of claim 1, wherein oxygen supplied to the pulverized coal/oxygen burner is heated and heated by at least a portion of the combustion generated gas of the pulverized coal/oxygen burner.
Pulverized coal combustion method using the described pulverized coal/oxygen burner.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11198291A JPH04340010A (en) | 1991-05-16 | 1991-05-16 | Method of burning pulverized coal using pulverized coal and oxygen burner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11198291A JPH04340010A (en) | 1991-05-16 | 1991-05-16 | Method of burning pulverized coal using pulverized coal and oxygen burner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04340010A true JPH04340010A (en) | 1992-11-26 |
Family
ID=14574989
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11198291A Pending JPH04340010A (en) | 1991-05-16 | 1991-05-16 | Method of burning pulverized coal using pulverized coal and oxygen burner |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04340010A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010054144A (en) * | 2008-08-29 | 2010-03-11 | Hitachi Ltd | Oxygen combustion boiler system and combustion method |
| WO2012078269A3 (en) * | 2010-12-07 | 2014-01-30 | Praxair Technology, Inc. | Directly fired oxy-fuel boiler with partition walls |
-
1991
- 1991-05-16 JP JP11198291A patent/JPH04340010A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010054144A (en) * | 2008-08-29 | 2010-03-11 | Hitachi Ltd | Oxygen combustion boiler system and combustion method |
| WO2012078269A3 (en) * | 2010-12-07 | 2014-01-30 | Praxair Technology, Inc. | Directly fired oxy-fuel boiler with partition walls |
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