JP2015232294A5

JP2015232294A5 -

Info

Publication number: JP2015232294A5
Application number: JP2014119381A
Authority: JP
Filing date: 2014-06-10
Publication date: 2017-01-19
Anticipated expiration: 2034-06-10

Description

上記課題を解決するために、本発明の排熱回収装置、内燃機関システムおよび船舶、並びに排熱回収方法は以下の手段を採用する。
すなわち、本発明にかかる排熱回収装置は、内燃機関本体から排出された排ガスから熱回収することによって主蒸気を生成する排ガスエコノマイザと、主に該排ガスエコノマイザから導かれた前記主蒸気によって駆動される蒸気タービンと、前記排ガスエコノマイザにて熱回収する温度よりも低温とされた低温熱源から熱回収することによって有機媒体の蒸気を生成する有機流体熱交換器と、前記有機流体熱交換器で生成された前記有機流体の蒸気によって駆動される有機流体タービンと、前記蒸気タービン及び前記有機流体タービンのうち少なくも一つからの出力によって発電する発電機と、燃料の燃焼熱によって補助蒸気を生成する補助ボイラとを備え、前記有機流体タービンは、前記蒸気タービンの速度調整に従属した速度で運転され、前記排ガスエコノマイザで生成された前記主蒸気の圧力が閾値以下となった場合に、前記補助ボイラで生成された前記補助蒸気が前記蒸気タービンに供給され、前記閾値は、前記蒸気タービンが前記排ガスエコノマイザから供給される主蒸気によって単独運転できる最小圧力を基準に定められることを特徴とする。 In order to solve the above problems, the exhaust heat recovery apparatus, internal combustion engine system and ship, and exhaust heat recovery method of the present invention employ the following means.
That is, the exhaust heat recovery apparatus according to the present invention is driven by an exhaust gas economizer that generates main steam by recovering heat from the exhaust gas discharged from the internal combustion engine main body, and the main steam guided mainly from the exhaust gas economizer. A steam turbine, an organic fluid heat exchanger that generates steam of an organic medium by recovering heat from a low-temperature heat source that is lower than the temperature at which heat is recovered by the exhaust gas economizer, and generated by the organic fluid heat exchanger An organic fluid turbine driven by the steam of the organic fluid generated, a generator for generating electricity from at least one of the steam turbine and the organic fluid turbine, and generating auxiliary steam by combustion heat of fuel The organic fluid turbine is operated at a speed dependent on the speed adjustment of the steam turbine. If the pressure of the main steam generated in the exhaust gas economizer is equal to or less than the threshold value, the auxiliary steam generated by an auxiliary boiler is supplied to the steam turbine, the threshold value, the steam turbine the exhaust gas economizer It is determined on the basis of the minimum pressure that can be independently operated by the main steam supplied from .

また、本発明の排熱回収方法は、内燃機関本体から排出された排ガスから熱回収することによって主蒸気を生成する主蒸気生成工程と、該主蒸気生成工程で得られた主蒸気によって蒸気タービンを駆動する蒸気タービン駆動工程と、前記主蒸気生成工程にて熱回収する温度よりも低温とされた低温熱源から熱回収することによって有機流体の蒸気を生成する有機流体蒸気生成工程と、該有機流体蒸気生成工程で得られた前記有機流体の蒸気によって有機流体タービンを駆動する有機流体タービン駆動工程と、前記蒸気タービン駆動工程及び前記有機流体タービン駆動工程の少なくとも一つの工程で得られた出力によって発電を行う発電工程と、燃料の燃焼熱によって補助蒸気を生成する補助蒸気生成工程とを有し、前記有機流体タービンを、前記蒸気タービンの速度調整に従属した速度で運転し、前記主蒸気生成工程で生成される主蒸気の圧力が閾値以下となった場合に、前記補助蒸気生成工程で生成された前記補助蒸気を前記蒸気タービンに供給する排熱回収方法であって、前記閾値は、前記蒸気タービンが前記主蒸気によって単独運転できる最小圧力を基準に定められることを特徴とする。 Further, the exhaust heat recovery method of the present invention includes a main steam generating step for generating main steam by recovering heat from exhaust gas discharged from an internal combustion engine body, and a steam turbine using the main steam obtained in the main steam generating step. A steam turbine driving step for driving the organic fluid, an organic fluid vapor generating step for generating an organic fluid vapor by recovering heat from a low-temperature heat source lower than the temperature for recovering heat in the main steam generating step, and the organic An organic fluid turbine driving step of driving an organic fluid turbine by the steam of the organic fluid obtained in the fluid vapor generation step, and an output obtained in at least one of the steam turbine driving step and the organic fluid turbine driving step. A power generation step of generating power, and an auxiliary steam generation step of generating auxiliary steam by the combustion heat of the fuel, the organic fluid turbine, When the pressure of the main steam generated in the main steam generation step is below a threshold value, the auxiliary steam generated in the auxiliary steam generation step is operated at a speed dependent on the speed adjustment of the steam turbine. An exhaust heat recovery method for supplying to a steam turbine , wherein the threshold value is determined based on a minimum pressure at which the steam turbine can be operated independently by the main steam .

Claims

An exhaust gas economizer that generates main steam by recovering heat from the exhaust gas discharged from the internal combustion engine body;
A steam turbine driven by the main steam led mainly from the exhaust gas economizer;
An organic fluid heat exchanger that generates steam of an organic medium by recovering heat from a low-temperature heat source that is lower than the temperature of heat recovery by the exhaust gas economizer;
An organic fluid turbine driven by steam of the organic fluid generated in the organic fluid heat exchanger;
A generator for generating electricity by output from at least one of the steam turbine and the organic fluid turbine;
An auxiliary boiler that generates auxiliary steam by the combustion heat of the fuel;
With
The organic fluid turbine is operated at a speed dependent on speed regulation of the steam turbine;
When the pressure of the main steam generated by the exhaust gas economizer is less than or equal to a threshold value, the auxiliary steam generated by the auxiliary boiler is supplied to the steam turbine ,
The exhaust heat recovery apparatus according to claim 1, wherein the threshold is determined based on a minimum pressure at which the steam turbine can be operated independently by main steam supplied from the exhaust gas economizer .

The exhaust heat recovery apparatus according to claim 1, wherein the auxiliary boiler is a fuel heating boiler that generates steam for heating fuel oil supplied to the internal combustion engine.

An internal combustion engine body;
The exhaust heat recovery device according to claim 1 or 2,
An internal combustion engine system comprising:

A ship comprising the internal combustion engine system according to claim 3.

A main steam generating step for generating main steam by recovering heat from the exhaust gas discharged from the internal combustion engine body;
A steam turbine driving step of driving a steam turbine with the main steam obtained in the main steam generation step;
An organic fluid vapor generating step of generating an organic fluid vapor by recovering heat from a low-temperature heat source whose temperature is lower than the temperature of heat recovery in the main steam generating step;
An organic fluid turbine driving step of driving an organic fluid turbine with the vapor of the organic fluid obtained in the organic fluid vapor generation step;
A power generation step of generating power by the output obtained in at least one of the steam turbine driving step and the organic fluid turbine driving step;
An auxiliary steam generation process for generating auxiliary steam by the combustion heat of the fuel;
Have
Operating the organic fluid turbine at a speed dependent on speed regulation of the steam turbine;
If the pressure of the main steam generated by said main steam generation step is equal to or less than the threshold value, a heat recovery how to supply said auxiliary steam generated in the auxiliary steam generating step to the steam turbine,
The exhaust heat recovery method according to claim 1, wherein the threshold value is determined based on a minimum pressure at which the steam turbine can be operated independently by the main steam .