JP2011214559A - Low grade coal drying system - Google Patents

Low grade coal drying system Download PDF

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JP2011214559A
JP2011214559A JP2010086022A JP2010086022A JP2011214559A JP 2011214559 A JP2011214559 A JP 2011214559A JP 2010086022 A JP2010086022 A JP 2010086022A JP 2010086022 A JP2010086022 A JP 2010086022A JP 2011214559 A JP2011214559 A JP 2011214559A
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grade coal
steam
heat medium
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Hiroyuki Nakahara
博之 中拂
Norihiro Fukuda
憲弘 福田
Masaaki Kinoshita
正昭 木下
Hiromi Ishii
弘実 石井
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Mitsubishi Heavy Industries Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00—Combustion technologies with mitigation potential
    • Y02E20/16—Combined cycle power plant [CCPP], or combined cycle gas turbine [CCGT]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00—Combustion technologies with mitigation potential
    • Y02E20/16—Combined cycle power plant [CCPP], or combined cycle gas turbine [CCGT]
    • Y02E20/18—Integrated gasification combined cycle [IGCC], e.g. combined with carbon capture and storage [CCS]

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Abstract

PROBLEM TO BE SOLVED: To improve power generation efficiency by effectively utilizing exhaust heat generated in drying low grade coal.SOLUTION: This low grade coal drying system includes: a low grade coal drying device 102 drying the low grade coal 101 indirectly with latent heat of superheated steam A; a binary cycle 120 generating power by operating a steam turbine 124 by a circulating low boiling point heat medium 121; a preheater 128 provided in a process of circulating the heat medium 121, and preheating the heat medium 121 by indirect heat exchange with generated steam 104 generated from the low grade coal 101 by drying; an evaporator 127 provided in the process of circulating the heat medium 121, and vaporizing the heat medium 121 that has passed through the preheater 128, by indirect heat exchange with the generated steam 104; and a superheater 129 provided in the process of circulating the heat medium 121, and superheating the heat medium 121 that has passed through the evaporator 127, by indirect heat exchange with condensed water B produced by condensation of the superheated steam A that has dried the low grade coal 101.

Description

本発明は、低品位炭乾燥装置により低品位炭を乾燥させた際に発生する蒸気を熱源として利用する低品位炭乾燥システムに関する。   The present invention relates to a low-grade coal drying system that uses, as a heat source, steam generated when low-grade coal is dried by a low-grade coal drying apparatus.

例えば、石炭ガス化複合発電（Ｉｎｔｅｇｒａｔｅｄ Ｃｏａｌ Ｇａｓｉｆｉｃａｔｉｏｎ Ｃｏｍｂｉｎｅｄ Ｃｙｃｌｅ：ＩＧＣＣ）システムは、石炭をガス化し、ガスタービンおよび蒸気タービンからなるコンバインドサイクル発電と組み合わせることにより、従来型の石炭火力に比べ、さらなる高効率化・高環境性を目指した発電システムである。この石炭ガス化複合発電システムは、資源量が豊富な石炭を利用可能であることも大きなメリットであり、適用炭種を拡大することにより、さらにメリットが大きくなることが知られている。   For example, the Integrated Coal Gasification Combined Cycle (IGCC) system gasifies coal and combines it with combined cycle power generation consisting of a gas turbine and a steam turbine to achieve higher efficiency than conventional coal-fired power generation. This is a power generation system that aims to make it more environmentally friendly. This coal gasification combined power generation system has a great merit that it can use coal with abundant resources, and it is known that the merit will be further increased by expanding the types of applied coal.

ところが、褐炭や亜瀝青炭などの低品位炭は、持ち込まれる水分が多く、この水分により発電効率が低下する問題がある。このため、低品位炭を乾燥させて水分を除去する必要がある。   However, low-grade coal such as lignite and sub-bituminous coal has a large amount of moisture that is brought in, and there is a problem that power generation efficiency decreases due to this moisture. For this reason, it is necessary to dry the low-grade coal to remove moisture.

従来、例えば、特許文献１に記載の低品位炭乾燥システム（低品位炭を燃料とする発電方法）は、低品位炭から水分を除去する脱水改質プロセスが示されている。この脱水改質プロセスでは、蒸発分離した水分が蒸気の状態にあり、この蒸気を発電プロセス由来の復水の加熱に使用する。   Conventionally, for example, a low-grade coal drying system (a power generation method using low-grade coal as a fuel) described in Patent Document 1 shows a dehydration reforming process for removing moisture from low-grade coal. In this dehydration reforming process, the evaporated and separated water is in the state of steam, and this steam is used for heating the condensate derived from the power generation process.

特許第４１５３４４８号公報Japanese Patent No. 4153448

特許文献１に記載のように、脱水改質プロセスで発生した蒸気を発電プロセス由来の復水の加熱に使用することで、発電効率の向上を図れる。しかし、近年では、さらなる発電効率の向上が切望されている。   As described in Patent Document 1, by using the steam generated in the dehydration reforming process for heating the condensate derived from the power generation process, the power generation efficiency can be improved. However, in recent years, further improvement in power generation efficiency is eagerly desired.

本発明は、前記問題に鑑み、低品位炭を乾燥させた際の排熱を有効利用して発電効率の向上を図ることのできる低品位炭乾燥システムを提供することを目的とする。   In view of the above problems, an object of the present invention is to provide a low-grade coal drying system capable of improving power generation efficiency by effectively using exhaust heat when drying low-grade coal.

上述の目的を達成するために、本発明の低品位炭乾燥システムは、過熱蒸気の潜熱で間接的に低品位炭を乾燥させる低品位炭乾燥装置と、循環する低沸点熱媒により蒸気タービンが運転されて発電するバイナリサイクルと、前記熱媒が循環する過程に設けられ、乾燥により前記低品位炭から発生する発生蒸気、または前記低品位炭を乾燥させた前記過熱蒸気が凝縮した凝縮水の少なくとも一方との間接的な熱交換により前記熱媒を予熱する予熱器と、前記熱媒が循環する過程に設けられ、前記発生蒸気または前記凝縮水の少なくとも他方との間接的な熱交換により前記予熱器を経た前記熱媒を気化させる蒸発器と、を備えたことを特徴とする。   In order to achieve the above-mentioned object, the low-grade coal drying system of the present invention includes a low-grade coal drying apparatus that indirectly dries low-grade coal with the latent heat of superheated steam, and a steam turbine that uses a circulating low-boiling-point heat medium. A binary cycle that is operated to generate electricity and a process in which the heating medium circulates, and the generated steam generated from the low-grade coal by drying or the condensed water condensed by the superheated steam that has dried the low-grade coal. A preheater that preheats the heat medium by indirect heat exchange with at least one, and a process in which the heat medium circulates, and the heat medium that is indirectly exchanged with at least the other of the generated steam or the condensed water. And an evaporator that vaporizes the heat medium that has passed through a preheater.

この低品位炭乾燥システムによれば、乾燥により低品位炭から発生する発生蒸気、および低品位炭を乾燥させた過熱蒸気が凝縮した凝縮水の排熱を、バイナリサイクルにおける熱媒の予熱および蒸発に用いることでバイナリサイクルでの発電に有効利用し、発電効率を向上することができる。   According to this low-grade coal drying system, the heat generated from the low-grade coal by drying and the exhaust heat of the condensed water condensed by the superheated steam that dries the low-grade coal are preheated and evaporated in the binary cycle. It can be effectively used for power generation in the binary cycle and can improve power generation efficiency.

また、本発明の低品位炭乾燥システムでは、前記熱媒が循環する過程に設けられ、前記低品位炭を乾燥させた前記過熱蒸気が凝縮した凝縮水との間接的な熱交換により前記蒸発器を経た前記熱媒を過熱させる過熱器を備え、前記予熱器は、乾燥により前記低品位炭から発生する発生蒸気との間接的な熱交換により前記熱媒を予熱し、前記蒸発器は、乾燥により前記低品位炭から発生する発生蒸気との間接的な熱交換により前記予熱器を経た前記熱媒を気化させることを特徴とする。   Further, in the low-grade coal drying system of the present invention, the evaporator is provided by indirect heat exchange with the condensed water in which the superheated steam obtained by drying the low-grade coal is provided in the process of circulating the heat medium. The preheater preheats the heat medium by indirect heat exchange with the generated steam generated from the low-grade coal by drying, and the evaporator is dried. Thus, the heat medium having passed through the preheater is vaporized by indirect heat exchange with generated steam generated from the low-grade coal.

この低品位炭乾燥システムによれば、乾燥により低品位炭から発生する発生蒸気、および低品位炭を乾燥させた過熱蒸気が凝縮した凝縮水の排熱を、バイナリサイクルにおける熱媒の予熱、蒸発、および過熱に用いることでバイナリサイクルでの発電に有効利用し、発電効率を向上することができる。   According to this low-grade coal drying system, the generated heat generated from the low-grade coal by drying and the exhaust heat of the condensed water condensed by the superheated steam that dried the low-grade coal are preheated and evaporated in the binary cycle. By using it for overheating, it can be effectively used for power generation in the binary cycle, and the power generation efficiency can be improved.

また、本発明の低品位炭乾燥システムでは、前記低品位炭乾燥装置により乾燥された前記低品位炭をガス化ガスとする石炭ガス化炉と、前記石炭ガス化炉から供給されるガス化ガスを燃料として運転されるガスタービンと、前記ガスタービンの運転により発電する発電機と、前記ガスタービンから排出されるタービン排ガスの排熱により生成された蒸気により運転される蒸気タービンとを有する発電システムに適用され、前記蒸気タービンから抽気した蒸気を過熱蒸気として前記低品位炭を乾燥させることを特徴とする。   In the low-grade coal drying system of the present invention, a coal gasification furnace using the low-grade coal dried by the low-grade coal drying apparatus as a gasification gas, and a gasification gas supplied from the coal gasification furnace Power generation system comprising: a gas turbine that is operated by using gas as a fuel; a generator that generates electric power by operating the gas turbine; and a steam turbine that is operated by steam generated by exhaust heat of turbine exhaust gas discharged from the gas turbine The low-grade coal is dried by using steam extracted from the steam turbine as superheated steam.

この低品位炭乾燥システムによれば、石炭ガス化複合発電システムの蒸気タービンから抽気した蒸気を、低品位炭を乾燥させる過熱蒸気として用いることができる。   According to this low-grade coal drying system, the steam extracted from the steam turbine of the coal gasification combined power generation system can be used as superheated steam for drying the low-grade coal.

また、本発明の低品位炭乾燥システムでは、前記熱媒が循環する過程に設けられて前記ガスタービンから排出されるタービン排ガスとの間接的な熱交換により前記予熱器に至る前記熱媒を事前に予熱する事前予熱器を備えたことを特徴とする。   Further, in the low-grade coal drying system of the present invention, the heating medium that reaches the preheater by indirect heat exchange with the turbine exhaust gas that is provided in the process of circulating the heating medium and exhausted from the gas turbine is preliminarily provided. A pre-heater for preheating is provided.

この低品位炭乾燥システムによれば、発電システムの排ガスの排熱を、バイナリサイクルにおける熱媒の事前予熱に用いることでバイナリサイクルでの発電に有効利用し、発電効率を向上することができる。   According to this low-grade coal drying system, exhaust heat of the exhaust gas of the power generation system is used for pre-heating of the heat medium in the binary cycle, so that it can be effectively used for power generation in the binary cycle and power generation efficiency can be improved.

本発明によれば、低品位炭を乾燥させた際の排熱を有効利用して発電効率の向上を図ることができる。   According to the present invention, it is possible to improve the power generation efficiency by effectively utilizing the exhaust heat generated when the low-grade coal is dried.

図１は、低品位炭乾燥システムの一例を示す概略図である。FIG. 1 is a schematic diagram illustrating an example of a low-grade coal drying system. 図２は、図１に示す低品位炭乾燥システムを適用した石炭ガス化複合発電システムの一例を示す概略図である。FIG. 2 is a schematic diagram showing an example of a combined coal gasification combined power generation system to which the low-grade coal drying system shown in FIG. 1 is applied. 図３は、本発明の実施の形態１に係る低品位炭乾燥システムの概略図である。FIG. 3 is a schematic diagram of the low-grade coal drying system according to Embodiment 1 of the present invention. 図４は、バイナリサイクルに用いられる熱媒を説明する温度−エントロピ線図である。FIG. 4 is a temperature-entropy diagram illustrating the heat medium used in the binary cycle. 図５は、本発明の実施の形態１に係る低品位炭乾燥システムの他の例の概略図である。FIG. 5 is a schematic diagram of another example of the low-grade coal drying system according to Embodiment 1 of the present invention. 図６は、本発明の実施の形態１に係る低品位炭乾燥システムの他の例の概略図である。FIG. 6 is a schematic diagram of another example of the low-grade coal drying system according to Embodiment 1 of the present invention. 図７は、本発明の実施の形態１に係る低品位炭乾燥システムの他の例の概略図である。FIG. 7 is a schematic diagram of another example of the low-grade coal drying system according to Embodiment 1 of the present invention. 図８は、本発明の実施の形態１に係る低品位炭乾燥システムの他の例の概略図である。FIG. 8 is a schematic diagram of another example of the low-grade coal drying system according to Embodiment 1 of the present invention. 図９は、本発明の実施の形態１に係る低品位炭乾燥システムの他の例の概略図である。FIG. 9 is a schematic diagram of another example of the low-grade coal drying system according to Embodiment 1 of the present invention. 図１０は、本発明の実施の形態２に係る低品位炭乾燥システムの概略図である。FIG. 10 is a schematic diagram of a low-grade coal drying system according to Embodiment 2 of the present invention.

以下に、本発明に係る実施の形態を図面に基づいて詳細に説明する。なお、この実施の形態によりこの発明が限定されるものではない。また、下記実施の形態における構成要素には、当業者が置換可能かつ容易なもの、あるいは実質的に同一のものが含まれる。   Embodiments according to the present invention will be described below in detail with reference to the drawings. Note that the present invention is not limited to the embodiments. In addition, constituent elements in the following embodiments include those that can be easily replaced by those skilled in the art or those that are substantially the same.

本実施の形態について、図面を参照して説明する。図１は、低品位炭乾燥システムの一例を示す概略図である。   The present embodiment will be described with reference to the drawings. FIG. 1 is a schematic diagram illustrating an example of a low-grade coal drying system.

図１に示すように、低品位炭乾燥システム１００は、水分含量が高い褐炭等の低品位炭１０１を乾燥する低品位炭乾燥装置１０２と、低品位炭乾燥装置１０２内に設けられ、管状の内部に過熱蒸気（例えば１５０℃蒸気）Ａを供給して低品位炭１０１中の水分を除去する伝熱部材１０３と、前記伝熱部材１０３によって低品位炭１０１が乾燥される際に発生する発生蒸気１０４を低品位炭乾燥装置１０２の外部に排出する発生蒸気ラインＬ１と、前記発生蒸気ラインＬ１に介装され、発生蒸気１０４中の粉塵を除去する集塵装置１０５と、前記集塵装置１０５から粉塵が除去された発生蒸気１０４の一部を分岐し、流動化蒸気１０７として低品位炭乾燥装置１０２内に供給する分岐ラインＬ２と、前記低品位炭乾燥装置１０２から抜き出された乾燥炭１０８を冷却して製品炭１０９とする冷却器１１０とを備えるものである。 As shown in FIG. 1, a low-grade coal drying system 100 includes a low-grade coal drying device 102 that dries a low-grade coal 101 such as lignite having a high water content, and a low-grade coal drying device 102 that is tubular. A heat transfer member 103 that supplies superheated steam (for example, 150 ° C. steam) A inside to remove moisture in the low-grade coal 101, and generation that occurs when the low-grade coal 101 is dried by the heat transfer member 103 A generated steam line L 1 that discharges the steam 104 to the outside of the low-grade coal drying device 102, a dust collector 105 that is interposed in the generated steam line L 1 and removes dust in the generated steam 104, and the dust collection tap a portion of the steam generated 104 dust is removed from the apparatus 105, the branch line L 2 to be supplied to the low-grade coal drying device 102 as a fluidizing steam 107, withdrawn from the low-grade coal drying device 102 The dried coal 108 is cooled is intended and a cooler 110 to a product coal 109.

低品位炭乾燥システム１００において、低品位炭１０１は、図示しない供給手段により低品位炭乾燥装置１０２内に投入され、低品位炭乾燥装置１０２内に別に導入される流動化蒸気１０７により流動されて流動層１１１を形成する。上述した伝熱部材１０３は、この流動層１１１内に配置されている。伝熱部材１０３内には、１５０℃の過熱蒸気Ａが供給され、その高温の過熱蒸気Ａの潜熱を利用して低品位炭１０１を間接的に乾燥させるようにしている。乾燥に利用された過熱蒸気Ａは、例えば１５０℃の凝縮水Ｂとして低品位炭乾燥装置１０２の外部に排出されている。   In the low-grade coal drying system 100, the low-grade coal 101 is introduced into the low-grade coal drying apparatus 102 by a supply means (not shown) and is fluidized by the fluidized steam 107 separately introduced into the low-grade coal drying apparatus 102. A fluidized bed 111 is formed. The heat transfer member 103 described above is disposed in the fluidized bed 111. The superheated steam A at 150 ° C. is supplied into the heat transfer member 103, and the low-grade coal 101 is dried indirectly using the latent heat of the high-temperature superheated steam A. The superheated steam A used for drying is discharged to the outside of the low-grade coal drying apparatus 102 as, for example, 150 ° C. condensed water B.

すなわち、加熱手段である伝熱部材１０３内面では、過熱蒸気Ａが凝縮して液体（水分）になるので、この際に放熱される凝縮潜熱を、低品位炭１０１の乾燥の加熱に有効利用している。なお、高温の過熱蒸気Ａ以外としては、相変化を伴う熱媒であれば何れでも良く、例えばフロンやペンタンやアンモニア等を例示することができる。   That is, on the inner surface of the heat transfer member 103 that is a heating means, the superheated steam A condenses into a liquid (moisture), so that the condensed latent heat radiated at this time is effectively used for heating the low-grade coal 101 for drying. ing. Any heating medium other than the high-temperature superheated steam A may be used as long as it is accompanied by a phase change. Examples thereof include Freon, pentane, and ammonia.

伝熱部材１０３によって低品位炭１０１が乾燥される際に発生する発生蒸気１０４は、低品位炭乾燥装置１０２内において、流動層１１１の上部空間に形成されるフリーボード部Ｆから発生蒸気ラインＬ１により低品位炭乾燥装置１０２の外部に排出される。この発生蒸気１０４は、低品位炭１０１が乾燥し微粉化したものが含まれているので、サイクロンや電気集塵機等の集塵装置１０５により集塵して固体成分１１５として分離する。この固体成分１１５は、低品位炭乾燥装置１０２から抜き出された乾燥炭１０８に混合し、冷却器１１０で冷却し、製品炭１０９としている。この製品炭１０９は、例えばボイラ、ガス化炉等の原料として利用に供される。 The generated steam 104 generated when the low-grade coal 101 is dried by the heat transfer member 103 is generated from the free board portion F formed in the upper space of the fluidized bed 111 in the low-grade coal drying apparatus 102. 1 is discharged to the outside of the low-grade coal drying apparatus 102. Since the generated steam 104 includes a powder obtained by drying and pulverizing the low-grade coal 101, the generated steam 104 is collected by a dust collector 105 such as a cyclone or an electric dust collector and separated as a solid component 115. This solid component 115 is mixed with the dry coal 108 extracted from the low-grade coal drying apparatus 102 and cooled by the cooler 110 to obtain the product coal 109. This product charcoal 109 is used as a raw material for boilers, gasifiers, and the like.

一方、集塵装置１０５により集塵された後の発生蒸気１０４は、例えば１０５〜１１０℃の蒸気として低品位炭乾燥システム１００の外部に排出されている。また、集塵装置１０５により集塵された後の発生蒸気１０４の一部は、分岐ラインＬ２に介装された循環ファン１１４により低品位炭乾燥装置１０２内に送られて、低品位炭１０１の流動層１１１を流動させる流動化蒸気１０７として利用される。なお、流動層１１１を流動化させる流動化媒体としては、発生蒸気１０４の一部を再利用しているが、これに限定されず、例えば窒素、二酸化炭素またはこれらのガスを含む低酸素濃度の空気を用いてもよい。 On the other hand, the generated steam 104 after being collected by the dust collector 105 is discharged to the outside of the low-grade coal drying system 100 as steam at 105 to 110 ° C., for example. Part of the steam generated 104 after being dust collecting by a dust collector 105, is sent to the low-grade coal drying device 102 by the circulation fan 114 interposed in the branch line L 2, low-grade coal 101 Is used as fluidized steam 107 for fluidizing the fluidized bed 111. As a fluidizing medium for fluidizing the fluidized bed 111, a part of the generated steam 104 is reused. However, the fluidizing medium is not limited to this. For example, nitrogen, carbon dioxide, or a low oxygen concentration containing these gases is used. Air may be used.

なお、上述した低品位炭乾燥装置１０２により乾燥する被乾燥物として低品位炭１０１を例示したが、水分含量の高いものであれば低品位炭１０１以外の被乾燥物を乾燥対象としてもよい。   In addition, although the low grade coal 101 was illustrated as a to-be-dried material dried with the low-grade coal drying apparatus 102 mentioned above, as long as a moisture content is high, to-be-dried materials other than the low grade coal 101 may be made into drying object.

上述した低品位炭乾燥装置１０２で乾燥した製品炭１０９を用い、石炭ガス化複合発電（Ｉｎｔｅｇｒａｔｅｄ Ｃｏａｌ Ｇａｓｉｆｉｃａｔｉｏｎ Ｃｏｍｂｉｎｅｄ Ｃｙｃｌｅ：ＩＧＣＣ）システムに適用した一例を説明する。図２は、図１に示す低品位炭乾燥システムを適用した石炭ガス化複合発電システムの一例を示す概略図である。   An example applied to a coal gasification combined power generation (IGCC) system using the product coal 109 dried by the above-described low-grade coal drying apparatus 102 will be described. FIG. 2 is a schematic diagram showing an example of a combined coal gasification combined power generation system to which the low-grade coal drying system shown in FIG. 1 is applied.

図２に示すように、石炭ガス化複合発電システム２００は、石炭（低品位炭乾燥システム１００で乾燥された製品炭１０９）がミル２１０粉砕された微粉炭２０１ａを処理してガス化ガス２０２に変換する石炭ガス化炉２０３と、前記ガス化ガス２０２を燃料として運転されるガスタービン（ＧＴ）２０４と、前記ガスタービン２０４からのタービン排ガス２０５を導入する排熱回収ボイラ（Ｈｅａｔ Ｒｅｃｏｖｅｒｙ Ｓｔｅａｍ Ｇｅｎｅｒａｔｏｒ：ＨＲＳＧ）２０６で生成した蒸気２０７により運転される蒸気タービン（ＳＴ）２０８と、前記ガスタービン２０４および／または前記蒸気タービン２０８と連結された発電機（Ｇ）２０９とを備えるものである。   As shown in FIG. 2, the coal gasification combined power generation system 200 treats pulverized coal 201 a obtained by pulverizing coal (product charcoal 109 dried by the low-grade coal drying system 100) into a gasification gas 202. A coal gasification furnace 203 for conversion, a gas turbine (GT) 204 operated using the gasification gas 202 as a fuel, and a heat recovery steam generator (heat recovery steam generator) for introducing turbine exhaust gas 205 from the gas turbine 204 The steam turbine (ST) 208 operated by the steam 207 generated by the HRSG) 206, and the generator (G) 209 connected to the gas turbine 204 and / or the steam turbine 208 are provided.

この石炭ガス化複合発電システム２００は、ミル２１０で粉砕された微粉炭２０１ａを石炭ガス化炉２０３でガス化し、生成ガスであるガス化ガス２０２を得る。このガス化ガス２０２は、サイクロン２１１およびガス精製装置２１２で除塵およびガス精製された後、発電手段であるガスタービン２０４の燃焼器２１３に供給され、ここで燃焼して高温高圧の燃焼ガス２１４を生成する。そして、この燃焼ガス２１４によってガスタービン２０４を駆動する。このガスタービン２０４は、発電機２０９と連結されており、ガスタービン２０４が駆動することによって発電機２０９が電力を発生する。ガスタービン２０４を駆動した後のタービン排ガス２０５は、まだ約５００〜６００℃の温度を持っているため、排熱回収ボイラ（ＨＲＳＧ）２０６へ送られ、ここで熱エネルギーが回収される。この排熱回収ボイラ（ＨＲＳＧ）２０６では、タービン排ガス２０５の熱エネルギーによって蒸気２０７が生成され、この蒸気２０７によって蒸気タービン２０８を駆動する。この排熱回収ボイラ（ＨＲＳＧ）２０６で熱エネルギーが回収された排ガス２１５は、ガス浄化装置２１６で排ガス２１５中のＮＯｘおよびＳＯｘ分が除去された後、煙突２１７を介して大気中へ放出される。なお、図中、符号２１８は復水器、２１９は空気、２２０は圧縮機、２２１は空気を窒素（Ｎ２）と酸素（Ｏ２）とに分離する空気分離装置（ＡＳＵ）を各々図示する。 The coal gasification combined power generation system 200 gasifies pulverized coal 201a pulverized by a mill 210 in a coal gasification furnace 203 to obtain a gasified gas 202 which is a generated gas. The gasified gas 202 is subjected to dust removal and gas purification by a cyclone 211 and a gas purification device 212, and then supplied to a combustor 213 of a gas turbine 204, which is a power generation means, where it is burned to produce a high-temperature and high-pressure combustion gas 214. Generate. The gas turbine 204 is driven by the combustion gas 214. The gas turbine 204 is connected to a generator 209, and the generator 209 generates electric power when the gas turbine 204 is driven. Since the turbine exhaust gas 205 after driving the gas turbine 204 still has a temperature of about 500 to 600 ° C., it is sent to an exhaust heat recovery boiler (HRSG) 206, where thermal energy is recovered. In the exhaust heat recovery boiler (HRSG) 206, steam 207 is generated by the thermal energy of the turbine exhaust gas 205, and the steam turbine 208 is driven by the steam 207. The exhaust gas 215 from which heat energy has been recovered by the exhaust heat recovery boiler (HRSG) 206 is released into the atmosphere via the chimney 217 after the NOx and SOx components in the exhaust gas 215 are removed by the gas purification device 216. . In the figure, reference numeral 218 denotes a condenser, 219 denotes air, 220 denotes a compressor, and 221 denotes an air separation device (ASU) that separates air into nitrogen (N 2 ) and oxygen (O 2 ). .

この石炭ガス化複合発電システム２００によれば、高い水分を有する低品位炭１０１を用いてガス化する場合においても、効率的な低品位炭乾燥装置１０２により低品位炭１０１を乾燥しているので、ガス化効率が向上し、長期間に亙って安定して発電を行うことができる。   According to this coal gasification combined cycle power generation system 200, even when gasifying using low-grade coal 101 having high moisture, the low-grade coal 101 is dried by the efficient low-grade coal drying device 102. Gasification efficiency is improved and power generation can be performed stably over a long period of time.

また、石炭ガス化複合発電システム２００においては、ガスタービンおよび蒸気タービンの組み合わせによって、従来４０％程度であった石炭焚発電プラントの効率を約４６％まで向上させることができる。このプラント効率の向上によって、ＣＯ２の排出量は従来の石炭焚ボイラに対して約１３％削減できる。 Moreover, in the coal gasification combined cycle power generation system 200, the efficiency of the coal-fired power plant, which has been about 40% in the past, can be improved to about 46% by combining the gas turbine and the steam turbine. By improving the plant efficiency, CO 2 emissions can be reduced by about 13% compared to conventional coal fired boilers.

なお、本実施の形態に係る低品位炭乾燥システム１００で乾燥した製品炭１０９を用いた発電システムとしては、上述した石炭ガス化複合発電システム２００に限らない。例えば、図には明示しないが、低品位炭乾燥システム１００で乾燥した製品炭１０９をボイラ火炉に供給し、当該ボイラ火炉で発生した蒸気で蒸気タービンを駆動して発電機により出力を得る褐炭炊ボイラによる発電システムであってもよい。   Note that the power generation system using the product coal 109 dried by the low-grade coal drying system 100 according to the present embodiment is not limited to the coal gasification combined power generation system 200 described above. For example, although not clearly shown in the figure, the charcoal 109 dried by the low-grade coal drying system 100 is supplied to a boiler furnace, the steam turbine is driven by steam generated in the boiler furnace, and the output is generated by a generator. A power generation system using a boiler may be used.

［実施の形態１］
図３は、本実施の形態に係る低品位炭乾燥システムの概略図である。図３に示すように、本実施の形態の低品位炭乾燥システム１００は、集塵装置１０５により集塵された後の約１０５〜１１０℃の発生蒸気１０４を、バイナリサイクル１２０に利用している。 [Embodiment 1]
FIG. 3 is a schematic diagram of a low-grade coal drying system according to the present embodiment. As shown in FIG. 3, the low-grade coal drying system 100 of the present embodiment uses the generated steam 104 at about 105 to 110 ° C. after being collected by the dust collector 105 in the binary cycle 120. .

バイナリサイクル１２０は、熱媒１２１を循環させる熱媒循環ライン１２２に、循環ポンプ１２３、蒸気タービン１２４および復水器１２５が設けられている。蒸気タービン１２４は、発電機（Ｇ）１２６が連結されている。熱媒循環ライン１２２に循環される熱媒１２１は、低沸点熱媒であり、タービン膨張過程で湿り域に入らないもの、すなわち図４の熱媒を説明する温度−エントロピ線図に示すように、タービン膨張過程での蒸発側の飽和曲線の勾配が正であることが好ましく、例えば、イソブタンやイソペンタンなどが適用される。   In the binary cycle 120, a circulation pump 123, a steam turbine 124 and a condenser 125 are provided in a heat medium circulation line 122 for circulating the heat medium 121. The steam turbine 124 is connected to a generator (G) 126. The heat medium 121 circulated through the heat medium circulation line 122 is a low boiling point heat medium that does not enter the wet region during the turbine expansion process, that is, as shown in the temperature-entropy diagram illustrating the heat medium in FIG. The slope of the saturation curve on the evaporation side during the turbine expansion process is preferably positive, and for example, isobutane or isopentane is applied.

また、バイナリサイクル１２０は、熱媒循環ライン１２２に、蒸発器１２７、予熱器１２８および過熱器１２９が設けられている。そして、バイナリサイクル１２０は、熱媒循環ライン１２２における熱媒の循環方向で、循環ポンプ１２３、予熱器１２８、蒸発器１２７、過熱器１２９、蒸気タービン１２４、復水器１２５の順で配置されている。   In the binary cycle 120, an evaporator 127, a preheater 128, and a superheater 129 are provided in the heat medium circulation line 122. The binary cycle 120 is arranged in the order of the circulation of the heat medium in the heat medium circulation line 122 in the order of the circulation pump 123, the preheater 128, the evaporator 127, the superheater 129, the steam turbine 124, and the condenser 125. Yes.

蒸発器１２７は、熱媒１２１を通過させるケーシング１２７ａ内に、発生蒸気ラインＬ１に繋がる管状の伝熱部材１２７ｂが設けられている。また、予熱器１２８は、熱媒１２１を通過させるケーシング１２８ａ内に、発生蒸気ラインＬ１に繋がる管状の伝熱部材１２８ｂが設けられている。そして、低品位炭乾燥装置１０２から発生蒸気ラインＬ１に排出された発生蒸気１０４は、蒸発器１２７、予熱器１２８の順で蒸発器１２７および予熱器１２８を経由する。すなわち、低品位炭乾燥装置１０２にて低品位炭１０１の乾燥により発生する発生蒸気１０４は、蒸発器１２７にて間接的な熱交換により熱媒１２１を気化させる。その後、発生蒸気１０４は、予熱器１２８にて間接的な熱交換により熱媒１２１を予熱する。 Evaporator 127, in a casing 127a for passing the heating medium 121, the heat transfer member 127b of the tubular which leads to generating steam line L 1 is provided. Furthermore, the preheater 128, in a casing 128a for passing the heating medium 121, the heat transfer member 128b of the tubular which leads to generating steam line L 1 is provided. Then, the generated steam 104 discharged from the low-grade coal drying apparatus 102 to the generated steam line L 1 passes through the evaporator 127 and the preheater 128 in the order of the evaporator 127 and the preheater 128. That is, the generated steam 104 generated by drying the low-grade coal 101 in the low-grade coal drying apparatus 102 vaporizes the heat medium 121 by indirect heat exchange in the evaporator 127. Thereafter, the generated steam 104 preheats the heat medium 121 by indirect heat exchange in the preheater 128.

過熱器１２９は、熱媒１２１を通過させるケーシング１２９ａ内に、低品位炭乾燥装置１０２における伝熱部材１０３の凝縮水Ｂを排出する側のラインに繋がる管状の伝熱部材１２９ｂが設けられている。すなわち、低品位炭１０１を乾燥させた過熱蒸気Ａが凝縮した凝縮水Ｂは、過熱器１２９を経由し、間接的な熱交換により熱媒１２１を過熱する。   In the superheater 129, a tubular heat transfer member 129 b connected to the line on the side where the condensed water B of the heat transfer member 103 in the low-grade coal drying apparatus 102 is discharged is provided in the casing 129 a through which the heat medium 121 passes. . That is, the condensed water B in which the superheated steam A obtained by drying the low-grade coal 101 is condensed passes through the superheater 129 and heats the heat medium 121 by indirect heat exchange.

バイナリサイクル１２０は、循環ポンプ１２３により熱媒循環ライン１２２に熱媒１２１が循環する過程で、予熱器１２８にて熱媒１２１が予熱され、続いて蒸発器１２７にて熱媒１２１が気化され、続いて過熱器１２９にて熱媒１２１が過熱されて蒸気タービン１２４に供給される。そして、蒸気タービン１２４が気化・過熱された熱媒１２１により運転され発電機１２６が電力を発生する。   The binary cycle 120 is a process in which the heat medium 121 circulates in the heat medium circulation line 122 by the circulation pump 123, the heat medium 121 is preheated by the preheater 128, and then the heat medium 121 is vaporized by the evaporator 127. Subsequently, the heating medium 121 is heated by the superheater 129 and supplied to the steam turbine 124. Then, the steam turbine 124 is operated by the vaporized and superheated heat medium 121, and the generator 126 generates electric power.

このように、本実施の形態の低品位炭乾燥システム１００は、過熱蒸気Ａの潜熱で間接的に低品位炭１０１を乾燥させる低品位炭乾燥装置１０２と、循環する低沸点熱媒１２１により蒸気タービン１２４が運転されて発電するバイナリサイクル１２０と、熱媒１２１が循環する熱媒循環ライン１２２に設けられて乾燥により低品位炭１０１から発生する発生蒸気１０４との間接的な熱交換により熱媒１２１を予熱する予熱器１２８と、熱媒循環ライン１２２に設けられて発生蒸気１０４との間接的な熱交換により予熱器１２８を経た熱媒１２１を気化させる蒸発器１２７と、熱媒循環ライン１２２に設けられて低品位炭１０１を乾燥させた過熱蒸気Ａが凝縮した凝縮水Ｂとの間接的な熱交換により蒸発器１２７を経た熱媒１２１を過熱する過熱器１２９とを備える。   As described above, the low-grade coal drying system 100 according to the present embodiment uses the low-grade coal drying apparatus 102 that indirectly dries the low-grade coal 101 with the latent heat of the superheated steam A and the circulating low-boiling-point heat medium 121 to generate steam. The heat medium is obtained by indirect heat exchange between the binary cycle 120 that generates power by operating the turbine 124 and the generated steam 104 that is provided in the heat medium circulation line 122 through which the heat medium 121 circulates and is generated from the low-grade coal 101 by drying. A preheater 128 that preheats 121, an evaporator 127 that is provided in the heat medium circulation line 122 and vaporizes the heat medium 121 that has passed through the preheater 128 by indirect heat exchange with the generated steam 104, and the heat medium circulation line 122. The heating medium 121 that has passed through the evaporator 127 is heated by indirect heat exchange with the condensed water B condensed with the superheated steam A that has been dried on the low-grade coal 101. And a vessel 129.

この低品位炭乾燥システム１００によれば、乾燥により低品位炭１０１から発生する発生蒸気１０４、および低品位炭１０１を乾燥させた過熱蒸気Ａが凝縮した凝縮水Ｂの排熱を、バイナリサイクル１２０における熱媒１２１の予熱、蒸発、および過熱に用いることでバイナリサイクル１２０での発電に有効利用し、発電効率を向上することが可能になる。   According to the low-grade coal drying system 100, the generated steam 104 generated from the low-grade coal 101 by drying and the exhaust heat of the condensed water B condensed by the superheated steam A drying the low-grade coal 101 are converted into a binary cycle 120. By using it for preheating, evaporation, and overheating of the heat medium 121, it is possible to effectively use it for power generation in the binary cycle 120 and improve power generation efficiency.

ところで、上述した低品位炭乾燥システム１００は、低品位炭１０１を乾燥させた過熱蒸気Ａが凝縮した凝縮水Ｂを、バイナリサイクル１２０の過熱器１２９での熱媒１２１の過熱に利用しているが、この限りではない。図５〜図９は、本実施の形態に係る低品位炭乾燥システムの他の例の概略図である。   By the way, the low-grade coal drying system 100 described above uses the condensed water B condensed with the superheated steam A obtained by drying the low-grade coal 101 for overheating the heating medium 121 in the superheater 129 of the binary cycle 120. But this is not the case. 5 to 9 are schematic views of other examples of the low-grade coal drying system according to the present embodiment.

図５に示す低品位炭乾燥システム１００では、図３の過熱器１２９を有さない代わりに、蒸発器１２７のケーシング１２７ａ内に、低品位炭乾燥装置１０２における伝熱部材１０３の凝縮水Ｂを排出する側のラインに繋がる管状の伝熱部材１２７ｃが設けられている。すなわち、低品位炭１０１を乾燥させた過熱蒸気Ａが凝縮した凝縮水Ｂは、蒸発器１２７を経由し、間接的な熱交換により熱媒１２１を気化させる。   In the low-grade coal drying system 100 shown in FIG. 5, the condensed water B of the heat transfer member 103 in the low-grade coal drying device 102 is placed in the casing 127 a of the evaporator 127 instead of having the superheater 129 of FIG. 3. A tubular heat transfer member 127c connected to the line on the discharge side is provided. That is, the condensed water B in which the superheated steam A obtained by drying the low-grade coal 101 is condensed passes through the evaporator 127 and vaporizes the heat medium 121 through indirect heat exchange.

図６に示す低品位炭乾燥システム１００では、図３の過熱器１２９を有さない代わりに、予熱器１２８のケーシング１２８ａ内に、低品位炭乾燥装置１０２における伝熱部材１０３の凝縮水Ｂを排出する側のラインに繋がる管状の伝熱部材１２８ｃが設けられている。すなわち、低品位炭１０１を乾燥させた過熱蒸気Ａが凝縮した凝縮水Ｂは、予熱器１２８を経由し、間接的な熱交換により熱媒１２１を予熱する。   In the low-grade coal drying system 100 shown in FIG. 6, the condensed water B of the heat transfer member 103 in the low-grade coal drying device 102 is placed in the casing 128 a of the preheater 128 instead of having the superheater 129 of FIG. 3. A tubular heat transfer member 128c connected to the line on the discharge side is provided. That is, the condensed water B condensed with the superheated steam A obtained by drying the low-grade coal 101 preheats the heat medium 121 through indirect heat exchange via the preheater 128.

図７に示す低品位炭乾燥システム１００では、図３の過熱器１２９を有さない代わりに、蒸発器１２７のケーシング１２７ａ内に、伝熱部材１２７ｂと共に伝熱部材１２７ｃが設けられている。また、予熱器１２８のケーシング１２８ａ内に、伝熱部材１２８ｂと共に伝熱部材１２８ｃが設けられている。すなわち、低品位炭１０１を乾燥させた過熱蒸気Ａが凝縮した凝縮水Ｂは、発生蒸気１０４と共に蒸発器１２７を経由し、間接的な熱交換により熱媒１２１を気化させる。また、低品位炭１０１を乾燥させた過熱蒸気Ａが凝縮した凝縮水Ｂは、発生蒸気１０４と共に予熱器１２８を経由し、間接的な熱交換により熱媒１２１を予熱する。   In the low-grade coal drying system 100 shown in FIG. 7, a heat transfer member 127c is provided together with the heat transfer member 127b in the casing 127a of the evaporator 127 instead of having the superheater 129 of FIG. Further, a heat transfer member 128c is provided in the casing 128a of the preheater 128 together with the heat transfer member 128b. That is, the condensed water B condensed with the superheated steam A obtained by drying the low-grade coal 101 passes through the evaporator 127 together with the generated steam 104 and vaporizes the heat medium 121 by indirect heat exchange. The condensed water B condensed with the superheated steam A obtained by drying the low-grade coal 101 passes through the preheater 128 together with the generated steam 104 and preheats the heat medium 121 by indirect heat exchange.

図８に示す低品位炭乾燥システム１００では、図３の過熱器１２９を有さない代わりに、蒸発器１２７のケーシング１２７ａ内に、伝熱部材１２７ｂと共に伝熱部材１２７ｃが設けられている。すなわち、低品位炭１０１を乾燥させた過熱蒸気Ａが凝縮した凝縮水Ｂは、発生蒸気１０４と共に蒸発器１２７を経由し、間接的な熱交換により熱媒１２１を気化させる。   In the low-grade coal drying system 100 shown in FIG. 8, a heat transfer member 127c is provided together with the heat transfer member 127b in the casing 127a of the evaporator 127 instead of having the superheater 129 of FIG. That is, the condensed water B condensed with the superheated steam A obtained by drying the low-grade coal 101 passes through the evaporator 127 together with the generated steam 104 and vaporizes the heat medium 121 by indirect heat exchange.

図９に示す低品位炭乾燥システム１００では、図３の過熱器１２９を有さない代わりに、予熱器１２８のケーシング１２８ａ内に、伝熱部材１２８ｂと共に伝熱部材１２８ｃが設けられている。すなわち、低品位炭１０１を乾燥させた過熱蒸気Ａが凝縮した凝縮水Ｂは、発生蒸気１０４と共に予熱器１２８を経由し、間接的な熱交換により熱媒１２１を予熱する。   In the low-grade coal drying system 100 shown in FIG. 9, the heat transfer member 128 c is provided together with the heat transfer member 128 b in the casing 128 a of the preheater 128 instead of having the superheater 129 of FIG. 3. That is, the condensed water B condensed with the superheated steam A obtained by drying the low-grade coal 101 passes through the preheater 128 together with the generated steam 104 and preheats the heat medium 121 by indirect heat exchange.

このように、本実施の形態の低品位炭乾燥システム１００の他の例は、過熱蒸気Ａの潜熱で間接的に低品位炭１０１を乾燥させる低品位炭乾燥装置１０２と、循環する低沸点熱媒１２１により蒸気タービン１２４が運転されて発電するバイナリサイクル１２０と、熱媒１２１が循環する熱媒循環ライン１２２に設けられ、乾燥により低品位炭１０１から発生する発生蒸気１０４、または低品位炭１０１を乾燥させた過熱蒸気Ａが凝縮した凝縮水Ｂの少なくとも一方との間接的な熱交換により熱媒１２１を予熱する予熱器１２８と、熱媒１２１が循環する熱媒循環ライン１２２に設けられ、発生蒸気１０４または凝縮水Ｂの少なくとも他方との間接的な熱交換により予熱器を経た熱媒１２１を気化させる蒸発器１２７とを備える。   As described above, another example of the low-grade coal drying system 100 according to the present embodiment includes a low-grade coal drying apparatus 102 that indirectly dries the low-grade coal 101 with the latent heat of the superheated steam A, and a circulating low boiling point heat. The generated steam 104 generated from the low-grade coal 101 or the low-grade coal 101 provided in the binary cycle 120 in which the steam turbine 124 is operated by the medium 121 to generate electric power and the heat-medium circulation line 122 through which the heat medium 121 circulates is generated. A preheater 128 that preheats the heat medium 121 by indirect heat exchange with at least one of the condensed water B condensed with the superheated steam A dried, and a heat medium circulation line 122 through which the heat medium 121 circulates. An evaporator 127 that vaporizes the heat medium 121 that has passed through the preheater by indirect heat exchange with at least the other of the generated steam 104 or the condensed water B.

この低品位炭乾燥システム１００によれば、乾燥により低品位炭１０１から発生する発生蒸気１０４、および低品位炭１０１を乾燥させた過熱蒸気Ａが凝縮した凝縮水Ｂの排熱を、バイナリサイクル１２０における熱媒１２１の予熱および蒸発に用いることでバイナリサイクル１２０での発電に有効利用し、発電効率を向上することが可能になる。   According to the low-grade coal drying system 100, the generated steam 104 generated from the low-grade coal 101 by drying and the exhaust heat of the condensed water B condensed by the superheated steam A drying the low-grade coal 101 are converted into a binary cycle 120. By using it for preheating and evaporation of the heat medium 121 in the above, it is possible to effectively use it for power generation in the binary cycle 120 and improve power generation efficiency.

［実施の形態２］
図１０は、本実施の形態に係る低品位炭乾燥システムの概略図である。図１０に示すように、本実施の形態の低品位炭乾燥システム１００では、バイナリサイクル１２０は、上述した図３に示す実施の形態１の低品位炭乾燥システム１００に加え、熱媒循環ライン１２２の循環ポンプ１２３と予熱器１２８との間であって、予熱器１２８に至る以前の熱媒１２１に係り事前予熱器１３０が設けられている。 [Embodiment 2]
FIG. 10 is a schematic diagram of a low-grade coal drying system according to the present embodiment. As shown in FIG. 10, in the low-grade coal drying system 100 of the present embodiment, the binary cycle 120 is added to the above-described low-grade coal drying system 100 of the first embodiment shown in FIG. The pre-heater 130 is provided between the circulation pump 123 and the pre-heater 128 and the heat medium 121 before reaching the pre-heater 128.

そして、事前予熱器１３０は、熱媒１２１を通過させるケーシング１３０ａ内に、タービン排ガス２０５が供給される管状の伝熱部材１３０ｂが設けられている。タービン排ガス２０５は、低品位炭乾燥装置１０２により乾燥された低品位炭１０１（製品炭１０９）が適用される上述した石炭ガス化複合発電システム２００においてガスタービン２０４から排出されるものである。すなわち、事前予熱器１３０は、ガスタービン２０４から排出されるタービン排ガス２０５との間接的な熱交換により予熱器１２８に至る熱媒１２１を事前に予熱する。   The pre-heater 130 is provided with a tubular heat transfer member 130b to which the turbine exhaust gas 205 is supplied in a casing 130a through which the heat medium 121 passes. The turbine exhaust gas 205 is discharged from the gas turbine 204 in the above-described coal gasification combined power generation system 200 to which the low-grade coal 101 (product coal 109) dried by the low-grade coal drying apparatus 102 is applied. That is, the pre-heater 130 pre-heats the heat medium 121 reaching the pre-heater 128 in advance by indirect heat exchange with the turbine exhaust gas 205 discharged from the gas turbine 204.

このように、本実施の形態の低品位炭乾燥システム１００は、上述した図３に示す実施の形態１の低品位炭乾燥システム１００に加え、低品位炭乾燥装置１０２により乾燥された低品位炭１０１（製品炭１０９）をガス化ガス２０２とする石炭ガス化炉２０３と、石炭ガス化炉２０３から供給されるガス化ガス２０２を燃料として運転されるガスタービン（ＧＴ）２０４と、ガスタービン２０４の運転により発電する発電機（Ｇ）２０９と、を有する発電システムに適用され、熱媒１２１が循環する熱媒循環ライン１２２に設けられてガスタービン２０４から排出されるタービン排ガス２０５との間接的な熱交換により予熱器１２８に至る熱媒１２１を事前に予熱する事前予熱器１３０を備える。   Thus, the low-grade coal drying system 100 of the present embodiment is a low-grade coal dried by the low-grade coal drying apparatus 102 in addition to the low-grade coal drying system 100 of the first embodiment shown in FIG. 3 described above. 101 (product charcoal 109) as a gasification gas 202, a gas gasification furnace 203, a gas turbine (GT) 204 operated using the gasification gas 202 supplied from the coal gasification furnace 203 as a fuel, and a gas turbine 204 And a generator (G) 209 that generates electricity by the operation of the above, and is indirectly provided with a turbine exhaust gas 205 provided in a heat medium circulation line 122 through which the heat medium 121 circulates and discharged from the gas turbine 204. A pre-heater 130 that pre-heats the heat medium 121 that reaches the pre-heater 128 by heat exchange is provided.

この低品位炭乾燥システム１００によれば、発電システムの排ガスの排熱を、バイナリサイクル１２０における熱媒１２１の事前予熱に用いることでバイナリサイクル１２０での発電に有効利用し、発電効率を向上することが可能になる。   According to the low-grade coal drying system 100, the exhaust heat of the exhaust gas from the power generation system is used for pre-heating of the heat medium 121 in the binary cycle 120, so that it can be effectively used for power generation in the binary cycle 120 to improve power generation efficiency. It becomes possible.

ところで、上述した事前予熱器１３０は、上述した図５〜図９に示す実施の形態１の低品位炭乾燥システム１００に加えることもできる。この低品位炭乾燥システム１００においても、発電システムの排ガスの排熱を、バイナリサイクル１２０における熱媒１２１の事前予熱に用いることでバイナリサイクル１２０での発電に有効利用し、発電効率を向上することが可能になる。   By the way, the pre-heater 130 mentioned above can also be added to the low-grade coal drying system 100 of Embodiment 1 shown in FIGS. 5-9 mentioned above. Also in this low-grade coal drying system 100, exhaust heat of the exhaust gas from the power generation system is used for pre-heating of the heat medium 121 in the binary cycle 120 so that it can be effectively used for power generation in the binary cycle 120 to improve power generation efficiency. Is possible.

なお、上述した実施の形態１および実施の形態２の低品位炭乾燥システム１００において、低品位炭乾燥装置１０２の伝熱部材１０３に供給する過熱蒸気Ａとして、上述した石炭ガス化複合発電システム２００の蒸気タービン２０８から抽気した蒸気を用いてもよい。   In the low-grade coal drying system 100 according to Embodiment 1 and Embodiment 2 described above, the above-described coal gasification combined power generation system 200 is used as the superheated steam A supplied to the heat transfer member 103 of the low-grade coal drying apparatus 102. The steam extracted from the steam turbine 208 may be used.

この低品位炭乾燥システム１００によれば、石炭ガス化複合発電システム２００の蒸気タービン２０８から抽気した蒸気を、低品位炭１０１を乾燥させる過熱蒸気Ａとして用いることで、蒸気タービン２０８で得られる蒸気を有効利用することが可能になる。   According to this low-grade coal drying system 100, steam extracted from the steam turbine 208 of the coal gasification combined power generation system 200 is used as superheated steam A for drying the low-grade coal 101, so that steam obtained by the steam turbine 208 is obtained. Can be used effectively.

なお、上述した実施の形態１および実施の形態２の低品位炭乾燥システム１００では、低品位炭乾燥装置１０２は、伝熱部材１０３として管状のもので説明したが、過熱蒸気Ａが内部に供給されるものであればよく、例えば板状のものであってもよい。   In the low-grade coal drying system 100 according to Embodiment 1 and Embodiment 2 described above, the low-grade coal drying device 102 has been described as a tubular heat transfer member 103, but superheated steam A is supplied to the inside. For example, a plate shape may be used.

また、上述した実施の形態１および実施の形態２の低品位炭乾燥システム１００では、低品位炭乾燥装置１０２は、流動化蒸気１０７が低品位炭乾燥装置１０２内に導入されて低品位炭１０１を流動させる形態の、いわゆる流動層乾燥装置を一例として説明したが、これに限らない。例えば、スクリューフィーダを用いて低品位炭１０１を攪拌させつつ搬送することで低品位炭１０１を流動させる形態であってもよい。   Further, in the low-grade coal drying system 100 according to the first and second embodiments described above, the low-grade coal drying apparatus 102 includes the low-grade coal 101 in which the fluidized steam 107 is introduced into the low-grade coal drying apparatus 102. Although the so-called fluidized bed drying apparatus in the form of fluidizing has been described as an example, it is not limited thereto. For example, the low grade coal 101 may be fluidized by conveying the low grade coal 101 while stirring it using a screw feeder.

以上のように、本発明に係る低品位炭乾燥システムは、低品位炭を乾燥させた際の排熱を有効利用して発電効率の向上を図ることに適している。   As described above, the low-grade coal drying system according to the present invention is suitable for improving the power generation efficiency by effectively utilizing the exhaust heat when the low-grade coal is dried.

１００ 低品位炭乾燥システム
１０１ 低品位炭
１０２ 低品位炭乾燥装置
１０３ 伝熱部材
１０４ 発生蒸気
１０５ 集塵装置
１０７ 流動化蒸気
１０８ 乾燥炭
１０９ 製品炭
１１０ 冷却器
１１１ 流動層
１１４ 循環ファン
１１５ 固体成分
１２０ バイナリサイクル
１２１ 低沸点熱媒
１２２ 熱媒循環ライン
１２３ 循環ポンプ
１２４ 蒸気タービン
１２５ 復水器
１２６ 発電機
１２７ 蒸発器
１２７ａ ケーシング
１２７ｂ 伝熱部材
１２７ｃ 伝熱部材
１２８ 予熱器
１２８ａ ケーシング
１２８ｂ 伝熱部材
１２８ｃ 伝熱部材
１２９ 過熱器
１２９ａ ケーシング
１２９ｂ 伝熱部材
１３０ 事前予熱器
１３０ａ ケーシング
１３０ｂ 伝熱部材
２００ 石炭ガス化複合発電システム
２０１ 石炭
２０２ ガス化ガス
２０３ 石炭ガス化炉
２０４ ガスタービン
２０５ タービン排ガス
２０８ 蒸気タービン
Ａ 過熱蒸気
Ｂ 凝縮水
Ｆ フリーボード部
Ｌ１ 発生蒸気ライン
Ｌ２ 分岐ライン DESCRIPTION OF SYMBOLS 100 Low grade coal drying system 101 Low grade coal 102 Low grade coal drying apparatus 103 Heat transfer member 104 Generated steam 105 Dust collector 107 Fluidized steam 108 Dry coal 109 Product coal 110 Cooler 111 Fluidized bed 114 Circulation fan 115 Solid component 120 Binary cycle 121 Low boiling point heat medium 122 Heat medium circulation line 123 Circulation pump 124 Steam turbine 125 Condenser 126 Generator 127 Evaporator 127a Casing 127b Heat transfer member 127c Heat transfer member 128 Preheater 128a Casing 128b Heat transfer member 128c Heat transfer Member 129 Superheater 129a Casing 129b Heat transfer member 130 Pre-heater 130a Casing 130b Heat transfer member 200 Coal gasification combined cycle system 201 Coal 202 Gasification gas 203 Coal gasification furnace 204 Gas turbine 205 Turbine exhaust gas 208 Steam turbine A Superheated steam B Condensate F Free board section L 1 Generation steam line L 2 Branch line

Claims (4)

過熱蒸気の潜熱で間接的に低品位炭を乾燥させる低品位炭乾燥装置と、
循環する低沸点熱媒により蒸気タービンが運転されて発電するバイナリサイクルと、
前記熱媒が循環する過程に設けられ、乾燥により前記低品位炭から発生する発生蒸気、または前記低品位炭を乾燥させた前記過熱蒸気が凝縮した凝縮水の少なくとも一方との間接的な熱交換により前記熱媒を予熱する予熱器と、
前記熱媒が循環する過程に設けられ、前記発生蒸気または前記凝縮水の少なくとも他方との間接的な熱交換により前記予熱器を経た前記熱媒を気化させる蒸発器と、
を備えたことを特徴とする低品位炭乾燥システム。 A low-grade coal drying device that indirectly dries low-grade coal with the latent heat of superheated steam;
A binary cycle in which a steam turbine is operated by a circulating low boiling point heat medium to generate electricity;
Indirect heat exchange with at least one of the generated steam generated from the low-grade coal by drying or the condensed water condensed by the superheated steam drying the low-grade coal provided in the process of circulating the heat medium A preheater for preheating the heat medium,
An evaporator that is provided in a process in which the heat medium circulates and vaporizes the heat medium that has passed through the preheater by indirect heat exchange with at least the other of the generated steam or the condensed water;
A low-grade coal drying system characterized by comprising 前記熱媒が循環する過程に設けられ、前記低品位炭を乾燥させた前記過熱蒸気が凝縮した凝縮水との間接的な熱交換により前記蒸発器を経た前記熱媒を過熱させる過熱器を備え、
前記予熱器は、乾燥により前記低品位炭から発生する発生蒸気との間接的な熱交換により前記熱媒を予熱し、前記蒸発器は、乾燥により前記低品位炭から発生する発生蒸気との間接的な熱交換により前記予熱器を経た前記熱媒を気化させることを特徴とする請求項１に記載の低品位炭乾燥システム。 Provided in a process in which the heat medium circulates, comprising a superheater that superheats the heat medium that has passed through the evaporator by indirect heat exchange with condensed water in which the superheated steam that has dried the low-grade coal is condensed. ,
The preheater preheats the heating medium by indirect heat exchange with the generated steam generated from the low-grade coal by drying, and the evaporator is indirectly connected with the generated steam generated from the low-grade coal by drying. 2. The low-grade coal drying system according to claim 1, wherein the heat medium that has passed through the preheater is vaporized by natural heat exchange. 前記低品位炭乾燥装置により乾燥された前記低品位炭をガス化ガスとする石炭ガス化炉と、前記石炭ガス化炉から供給されるガス化ガスを燃料として運転されるガスタービンと、前記ガスタービンの運転により発電する発電機と、前記ガスタービンから排出されるタービン排ガスの排熱により生成された蒸気により運転される蒸気タービンとを有する発電システムに適用され、
前記蒸気タービンから抽気した蒸気を過熱蒸気として前記低品位炭を乾燥させることを特徴とする請求項１または２に記載の低品位炭乾燥システム。 A coal gasification furnace using the low-grade coal dried by the low-grade coal drying apparatus as a gasification gas, a gas turbine operated using the gasification gas supplied from the coal gasification furnace as fuel, and the gas Applied to a power generation system having a generator that generates electricity by operating a turbine, and a steam turbine that is operated by steam generated by exhaust heat of turbine exhaust gas discharged from the gas turbine;
The low-grade coal drying system according to claim 1 or 2, wherein the steam extracted from the steam turbine is used as superheated steam to dry the low-grade coal. 前記熱媒が循環する過程に設けられて前記ガスタービンから排出されるタービン排ガスとの間接的な熱交換により前記予熱器に至る前記熱媒を事前に予熱する事前予熱器を備えたことを特徴とする請求項３に記載の低品位炭乾燥システム。   A pre-heater is provided in the process of circulating the heat medium to pre-heat the heat medium reaching the pre-heater in advance by indirect heat exchange with the turbine exhaust gas discharged from the gas turbine. The low-grade coal drying system according to claim 3.
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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103162547A (en) * 2013-03-23 2013-06-19 山西易通环能科技集团有限公司 Method and device of generating power using sintering kiln tail gas low-temperature waste heat
JP2013174182A (en) * 2012-02-24 2013-09-05 Central Research Institute Of Electric Power Industry Coal-fired power generation system
JP2013180243A (en) * 2012-03-01 2013-09-12 Metawater Co Ltd Sludge drying system
JP2013184147A (en) * 2012-03-09 2013-09-19 Metawater Co Ltd Drying system of sludge
CN103939158A (en) * 2014-05-09 2014-07-23 湖南华银能源技术有限公司 Low-rank coal purification power generation system
CN114152033A (en) * 2021-12-07 2022-03-08 国能生物发电集团有限公司 Biomass drying equipment
CN114352364A (en) * 2021-07-22 2022-04-15 杭州绿能环保发电有限公司 Main steam temperature control device

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013174182A (en) * 2012-02-24 2013-09-05 Central Research Institute Of Electric Power Industry Coal-fired power generation system
JP2013180243A (en) * 2012-03-01 2013-09-12 Metawater Co Ltd Sludge drying system
JP2013184147A (en) * 2012-03-09 2013-09-19 Metawater Co Ltd Drying system of sludge
CN103162547A (en) * 2013-03-23 2013-06-19 山西易通环能科技集团有限公司 Method and device of generating power using sintering kiln tail gas low-temperature waste heat
CN103939158A (en) * 2014-05-09 2014-07-23 湖南华银能源技术有限公司 Low-rank coal purification power generation system
CN114352364A (en) * 2021-07-22 2022-04-15 杭州绿能环保发电有限公司 Main steam temperature control device
CN114352364B (en) * 2021-07-22 2023-11-21 杭州绿能环保发电有限公司 Main steam temperature control device
CN114152033A (en) * 2021-12-07 2022-03-08 国能生物发电集团有限公司 Biomass drying equipment

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