JPH06207180A - Production of fuel for electricity generation and method for generating electricity - Google Patents

Production of fuel for electricity generation and method for generating electricity

Info

Publication number
JPH06207180A
JPH06207180A JP28750492A JP28750492A JPH06207180A JP H06207180 A JPH06207180 A JP H06207180A JP 28750492 A JP28750492 A JP 28750492A JP 28750492 A JP28750492 A JP 28750492A JP H06207180 A JPH06207180 A JP H06207180A
Authority
JP
Japan
Prior art keywords
fuel
boiler
low
crude oil
gas turbine
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.)
Granted
Application number
JP28750492A
Other languages
Japanese (ja)
Other versions
JP2576006B2 (en
Inventor
Masaki Iijima
Mutsunori Karasaki
Akiyoshi Mizoguchi
睦範 唐崎
明義 溝口
正樹 飯島
Original Assignee
Mitsubishi Heavy Ind Ltd
三菱重工業株式会社
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Application filed by Mitsubishi Heavy Ind Ltd, 三菱重工業株式会社 filed Critical Mitsubishi Heavy Ind Ltd
Priority to JP4287504A priority Critical patent/JP2576006B2/en
Publication of JPH06207180A publication Critical patent/JPH06207180A/en
Application granted granted Critical
Publication of JP2576006B2 publication Critical patent/JP2576006B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01KSTEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K23/00Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids
    • F01K23/02Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled
    • F01K23/06Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle
    • F01K23/10Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle with exhaust fluid of one cycle heating the fluid in another cycle

Abstract

(57) [Summary] [Objective] A method for producing a fuel for a repowering gas turbine and a fuel for a boiler installed in an existing boiler from low-sulfur crude oil instead of natural gas, and a method for generating power using the fuel. It is the one we are trying to provide. [Structure] A low-sulfur crude oil having a salt content adjusted to 0.5 ppm or less is separated by atmospheric distillation and / or vacuum distillation, and a boiler having a low boiling point fraction having a sulfur content of 0.5 wt% or less is used for a repowering gas turbine. A method for producing a fuel for a boiler, which comprises a fuel and a high boiling fraction having a sulfur content of more than 0.5% by weight, and the low boiling fraction is used as a fuel for a repowering gas turbine of a boiler. It is a method of generating electricity by driving a gas turbine and a steam turbine by using it as fuel for a boiler.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a fuel for a repowering gas turbine of a boiler and a fuel for a boiler from low-sulfur crude oil, and a method for driving a repowering gas turbine and a steam turbine of a boiler using the fuel. Regarding how to generate electricity.

[0002]

2. Description of the Related Art At present, in thermal power generation in Japan, a steam turbine is mainly used as a power generation method in which a turbine is rotated by high-temperature and high-pressure steam generated in a boiler. Heavy oil and crude oil are mainly used as the oil fuel for the boiler. Among them, in the case of crude oil burning, low-sulfur crude oil, which has a large amount of wax and a small amount of SO X , such as crude oil from Minas and crude oil from Daqing is preferably used from the viewpoint of pollution prevention. Recently, LNG, which is a good fuel
Combined cycle power generation using is used.

The above-described method of burning crude oil or heavy oil with a boiler and generating power with a steam turbine has a thermal efficiency of about 40% / HH.
It is relatively low as V standard (HHV: Higher heating value). On the other hand, in the combined cycle power generation adopted in LNG-fired, the fuel compressed by the air compressed by the compressor,
Alternatively, the compressed air is heated by combustion heat to generate high-temperature high-pressure gas, the turbine is rotated to generate electricity, and the high-temperature thermal energy of the combustion exhaust gas is recovered by the boiler to rotate the steam turbine to generate electricity again. The method is characterized by high thermal efficiency of about 48% / HHV standard.

More recently, in order to improve the power generation amount of an existing boiler by a simple method, a gas turbine is additionally installed beside the boiler to generate electric power with the gas turbine, and the high temperature combustion exhaust gas of the gas turbine is replaced with air. A method known as so-called boiler repowering, in which boiler fuel is burned to burn the boiler fuel, has become known. According to the boiler repowering method similar to this combined cycle power generation, since the boiler fuel is burned by using the combustion exhaust gas of the gas turbine in which about 13 vol% or more of oxygen remains, there is no particular problem in the combustion of the boiler. Since the high temperature thermal energy of about 580 ° C that the combustion exhaust gas of the gas turbine has can be effectively used in the boiler, the fuel of the boiler can be saved, the power generation amount as a whole can be increased, and the power generation efficiency (thermal efficiency) per fuel can be improved. You can

Since crude oil or heavy oil is used as the fuel for the boiler as described above, a storage facility such as a fuel tank is usually provided around the boiler. However, if an attempt is made to newly install the above-mentioned repowering gas turbine, the fuel is usually natural gas, and therefore the storage facility must be newly installed. Cryogenic temperatures are required for the transportation and storage of natural gas, which necessitates a large amount of new equipment costs, and handling natural gas in urban areas has many restrictions from the viewpoint of disaster prevention. Also, LN
Even if the natural gas vaporized from the G storage facility is transported to the oil-fired power plant by a pipeline, enormous cost is required. Therefore, if crude oil or heavy oil can be used instead of natural gas for a gas turbine for repowering, the merit will be great.

In Europe and the United States, attempts have already been made to use crude oil or residual oil as fuel for gas turbines, but impurities contained in these fuels often cause troubles, such as diesel oil and L oil.
It has been pointed out that the maintenance cost is higher than that when NG is used. And, as the impurity content of the oil fuel used for the gas turbine, the salt content is 0.5 ppm or less,
Sulfur content is 0.05 wt% or less, vanadium is 0.5 pp
It is said that it is desirable to limit it to m or less. In particular,
Salt and vanadium interact with each other to lower the melting point of gas turbine blade metal and cause ash to stick to the blade. Further, the above-mentioned standard of the sulfur content is similarly set from the viewpoint of blade protection. However, even low-sulfur crude oil such as the above-mentioned Minas crude oil or Daqing crude oil used as a boiler-burning fuel does not satisfy these criteria, and there is a problem that it cannot be used as it is as a gas turbine fuel.

[0007]

The present invention solves the above problems and a method for producing a fuel for a repowering gas turbine installed in an existing boiler and a fuel for a boiler from low-sulfur crude oil instead of natural gas. And a method for generating power using the fuel.

[0008]

According to the present invention, low-sulfur crude oil having a salt content adjusted to 0.5 ppm or less is separated by atmospheric distillation and / or vacuum distillation to obtain a sulfur content of 0.5% by weight or less. A method for producing a fuel for power generation, which comprises producing a fuel for a repowering gas turbine of a boiler made of a low boiling point fraction and a fuel for a boiler made of a high boiling point fraction having a sulfur content of more than 0.5% by weight, and the above. The low boiling point fraction is used as a fuel for a repowering gas turbine of a boiler, and the high boiling point fraction is used as a fuel for a boiler to drive a gas turbine and a steam turbine to generate electricity.

[0009]

The present inventors have diligently studied a method of using low-sulfur crude oil instead of natural gas as a fuel for a repowering gas turbine installed in an existing boiler, and as a result, as a fuel used in a gas turbine, the above standard Although it is desirable to use fuel with a low content of impurities, the restrictions on the content of impurities in existing boilers are relatively lenient.
Gas turbine fuels that meet all the necessary criteria by simply separating low-sulfur crude oil into low-boiling fractions and high-boiling fractions by simple desalination and simple distillation, and relatively mild restrictions on impurity content The present invention has been completed, paying attention to the fact that various boiler fuels can be obtained at the same time.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a diagram for explaining a method of manufacturing a fuel for repowering power generation in a boiler which is an embodiment of the present invention. In FIG. 1, only main steps are shown, and auxiliary equipment and the like are omitted. The low-sulfur crude oil used in the present invention preferably has a low sulfur content because it can simplify the desulfurization process of combustion exhaust gas. Usually, crude oil having a sulfur content of 1% by weight or less, more preferably 0.9% by weight or less is used. Examples of such crude oil include crude oil produced in Minas and crude oil produced in Daqing mentioned above, which have a large amount of wax. The amount of vanadium contained in these crude oils is usually 0.4-0.
It is 5 ppm. Of these, Minas crude oil has a low sulfur content of about 0.1% by weight or less, and is particularly preferable.

In the present invention, the salt content of such low sulfur crude oil is adjusted to 0.5 ppm or less in the desalting step 1. As a desalting method, usually, water is added to the crude oil for washing, and a static voltage of, for example, about 20,000 V is applied to separate the aqueous layer to reduce the salt content. In ordinary petroleum refining, the salt content is set to 3 ppm or less, but the salt content can be easily set to 0.5 ppm or less by repeating the above water washing desalting method.

The low-sulfur crude oil whose salt content is adjusted to 0.5 ppm or less is obtained by the atmospheric distillation step 2 or the vacuum distillation step 3.
In the above, it is possible to separate into a low-boiling fraction having a sulfur content of 0.05% by weight or less and a high-boiling fraction having a sulfur content of more than 0.05% by weight. Only one of the above distillations may be performed, or the fraction having a high boiling point separated in the atmospheric distillation step 2 may be further separated in the vacuum distillation step 3. Depending on the crude oil used, the boiling point fraction in which the sulfur content exceeds the boundary value of 0.05% by weight, or the fraction of the fraction differs, but in the case of the above-mentioned Minas crude oil, the gas oil fraction (converted to a normal pressure boiling point of about 340 to 460 OF
Below) to by separating the gas oil fraction (the four hundred sixty to six hundred and fifty O F) below boiling fraction and boiling fraction greater than, about 40% of the low-boiling fraction of the sulfur content of 0.05 wt% And a high boiling fraction having a sulfur content of more than 0.05% by weight can be obtained at a ratio of about 60%. Moreover, heavy metals such as vanadium are hardly detected in the low boiling fraction,
It is suitable as a fuel for repowering gas turbines.

[0013] In the above example of Minas crude oil, in the case of separating the crude oil by adjusting the salt content to below 0.5ppm by desalting on a following fraction boiling 650 O F, a fraction beyond that is, 650 O F following fraction ratio is 43.2% by volume, a sulfur content of 0.033 wt%, vanadium is not detected, it is possible to obtain optimum fuel as a gas turbine fuel for repowering . Residual oil (REDUCED-CRUDE, boiling point 650 O F or higher, specific gravity 26.5 O API, pour point 10 after collecting this low boiling fraction
6 OF ) has a sulfur content of about 0.15% by weight, which is as low as that of high-quality heavy oil, and the vanadium / nickel / iron content is about 1 each.
/ 15/10 ppm, which can be used as a boiler fuel without any trouble.

In the present invention, when the proportion of the high boiling point fraction (or residual oil) having a sulfur content of more than 0.05% by weight is large depending on the low sulfur crude oil used, it is further separated and used for the gas turbine. It is also possible to collect fuel that meets the criteria. As a method for further separating such residual oil, a known supercritical solvent extraction / separation method using a high temperature / high pressure solvent (for example, JP-A-57-31989 and JP-A-59-170191). Can be used.

[0015]

EFFECTS OF THE INVENTION The present invention employs the above-mentioned constitution to separate the desulfurized low-sulfur crude oil into a low-boiling fraction and a high-boiling fraction by atmospheric distillation or vacuum distillation. Fuels for gas turbines and boilers that meet all the criteria can be obtained. By using these fuels for the boiler repowering gas turbine and its boiler, respectively, the power generation amount is increased while suppressing the maintenance cost of the gas turbine, and moreover, the thermal efficiency is about 40% when the steam turbine is used to generate all the power. Power can be generated with higher thermal efficiency than that, and it is extremely advantageous from the viewpoint of energy saving, prevention of global warming by carbon dioxide, and suppression of generation of harmful substances such as SO X. In addition, there is no need for a storage facility for natural gas that is fired in the gas turbine near the existing boiler, and the economic advantage of simply introducing repowering is very great.

[Brief description of drawings]

FIG. 1 is an explanatory view of a process for producing a fuel for repowering a boiler and a fuel for the boiler from low-sulfur crude oil, which is one embodiment of the present invention.

Claims (2)

[Claims]
1. A boiler repowering gas comprising a low-sulfur crude oil having a salt content adjusted to 0.5 ppm or less, which is separated by atmospheric distillation and / or vacuum distillation, and which comprises a low-boiling fraction having a sulfur content of 0.5% by weight or less. Turbine fuel and sulfur content of 0.
A method for producing a fuel for power generation, which comprises producing a fuel for a boiler which comprises a high boiling point fraction exceeding 5% by weight.
2. A low-sulfur crude oil having a salt content adjusted to 0.5 ppm or less is subjected to atmospheric distillation and / or vacuum distillation to obtain a low-boiling fraction having a sulfur content of 0.5% by weight or less and a sulfur content of 0. Separating into a high boiling point fraction exceeding 5% by weight, using the low boiling point fraction as a fuel for a repowering gas turbine of a boiler, and using the high boiling point fraction as a fuel for a boiler to drive a gas turbine and a steam turbine. A power generation method characterized by generating power.
JP4287504A 1992-10-26 1992-10-26 Power generation method Expired - Lifetime JP2576006B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4287504A JP2576006B2 (en) 1992-10-26 1992-10-26 Power generation method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4287504A JP2576006B2 (en) 1992-10-26 1992-10-26 Power generation method

Publications (2)

Publication Number Publication Date
JPH06207180A true JPH06207180A (en) 1994-07-26
JP2576006B2 JP2576006B2 (en) 1997-01-29

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ID=17718199

Family Applications (1)

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Country Status (1)

Country Link
JP (1) JP2576006B2 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998029653A1 (en) * 1996-12-26 1998-07-09 Mitsubishi Heavy Industries, Ltd. Power generation method and power generating apparatus
WO2002034865A1 (en) * 2000-10-24 2002-05-02 Jgc Corpopation Refined oil and process for producing the same
WO2011149079A1 (en) * 2010-05-27 2011-12-01 住友商事株式会社 Hybrid thermal power generation system and method for constructing same

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5225806A (en) * 1975-08-21 1977-02-26 Idemitsu Kosan Co Ltd Method and appapatus for the desalting of crude oil
JPS55165992A (en) * 1979-06-12 1980-12-24 Hajime Omura Production of high-speed diesel fuel and lubricating oil from paraffinic heavy oil
JPS57177089A (en) * 1981-04-24 1982-10-30 Hitachi Ltd Device for treating fuel oil
JPS5974185A (en) * 1982-09-14 1984-04-26 Raffinage Cie Francaise Treatment of crude oil prior to atomospheric distillation
JPS60106883A (en) * 1983-11-16 1985-06-12 Chiyoda Chem Eng & Constr Co Ltd Method for removing salt in heavy hydrocarbon oil

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5225806A (en) * 1975-08-21 1977-02-26 Idemitsu Kosan Co Ltd Method and appapatus for the desalting of crude oil
JPS55165992A (en) * 1979-06-12 1980-12-24 Hajime Omura Production of high-speed diesel fuel and lubricating oil from paraffinic heavy oil
JPS57177089A (en) * 1981-04-24 1982-10-30 Hitachi Ltd Device for treating fuel oil
JPS5974185A (en) * 1982-09-14 1984-04-26 Raffinage Cie Francaise Treatment of crude oil prior to atomospheric distillation
JPS60106883A (en) * 1983-11-16 1985-06-12 Chiyoda Chem Eng & Constr Co Ltd Method for removing salt in heavy hydrocarbon oil

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998029653A1 (en) * 1996-12-26 1998-07-09 Mitsubishi Heavy Industries, Ltd. Power generation method and power generating apparatus
AU726473B2 (en) * 1996-12-26 2000-11-09 Mitsubishi Heavy Industries, Ltd. Power generation method and power generating apparatus
US6298651B1 (en) * 1996-12-26 2001-10-09 Mitsubishi Heavy Industries, Ltd. Power generation method and power generating apparatus
WO2002034865A1 (en) * 2000-10-24 2002-05-02 Jgc Corpopation Refined oil and process for producing the same
US7384537B2 (en) 2000-10-24 2008-06-10 Jgc Corporation Refined oil and process for producing the same
WO2011149079A1 (en) * 2010-05-27 2011-12-01 住友商事株式会社 Hybrid thermal power generation system and method for constructing same
US8850787B2 (en) 2010-05-27 2014-10-07 Sumitomo Corporation Hybrid thermal power generation system and method of constructing same

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