AU596505B2 - Combined gas and steam turbine power plant - Google Patents
Combined gas and steam turbine power plant Download PDFInfo
- Publication number
- AU596505B2 AU596505B2 AU13353/88A AU1335388A AU596505B2 AU 596505 B2 AU596505 B2 AU 596505B2 AU 13353/88 A AU13353/88 A AU 13353/88A AU 1335388 A AU1335388 A AU 1335388A AU 596505 B2 AU596505 B2 AU 596505B2
- Authority
- AU
- Australia
- Prior art keywords
- gas
- naphtha
- coal gasifier
- plant according
- plant
- 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.)
- Ceased
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C3/00—Gas-turbine plants characterised by the use of combustion products as the working fluid
- F02C3/20—Gas-turbine plants characterised by the use of combustion products as the working fluid using a special fuel, oxidant, or dilution fluid to generate the combustion products
- F02C3/26—Gas-turbine plants characterised by the use of combustion products as the working fluid using a special fuel, oxidant, or dilution fluid to generate the combustion products the fuel or oxidant being solid or pulverulent, e.g. in slurry or suspension
- F02C3/28—Gas-turbine plants characterised by the use of combustion products as the working fluid using a special fuel, oxidant, or dilution fluid to generate the combustion products the fuel or oxidant being solid or pulverulent, e.g. in slurry or suspension using a separate gas producer for gasifying the fuel before combustion
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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]
- Y02E20/18—Integrated gasification combined cycle [IGCC], e.g. combined with carbon capture and storage [CCS]
Abstract
In a combined gas and steam turbine power station with a preconnected coal gasifier and a gas cooling and gas purification system post-connected to the coal gasifier, the naphtha and oil fractions occurring are to be used for obtaining energy in a way that promises the greatest possible efficiency. To this end the invention provides for return of the tar fractions occurring in gas cooling and purification to the coal gasifier (15) and use of the naphtha and oil fractions occurring as additional gas turbine fuels. In addition the precipitated naphtha and oil fractions may be led into a reservoir (19) and fed to the combustion chamber (7) of the gas turbine as required. The invention is particularly suitable for coal-fired power stations. <IMAGE>
Description
596505 S F Ref: 51381 =ORM COMMONWEALTH OF AUSTRALIA PATENTS ACT 1952 COMPLETE SPECIFICATION
(ORIGINAL)
FOR OFFICE USE: Class Int Class S Complete Specification Lodged: Accepted: Published: Priority: Related Art: Name and Address of Applicant: Siemens Aktiengesellschaft 0 o Wittelsbacher Platz 2 8000 Muenchen FEDERAL REPUBLIC OF GERMANY Address for Service: Spruson Ferguson, Patent Attorneys Level 33 St Martins Tower, 31 Market Street Sydney, New South Wales, 2000, Australia SComplete Specification for the invention entitled: o p Combined Gas and Steam Turbine Power Plant "R The following statement is a full description of this invention, including the best method of performing it known to me/us 5845/3
ABSTRACT
COMBINED GAS AND STEAM TURBINE POWER PLANT In a combined gas and steam turbine power plant having an upstream coal gasifier and a gas-cooling and gas-cleaning plant downstream of the coal gasifier, the naphtha and oil fractions obtained should be extracted in such a way as to obtain energy in the most efficient way. The invention provides that the tar fractions obtained during gas-cooling and gas-cleaning be recycled to the coal gasifier and that the naphtha and t. o. oil fractions obtained be used as additional gas turbine fuel. Furthermore, the naphtha and oil fractions may be introduced into a store and according to requirements, be fed to the combustion 15 chamber of the gas turbine. The invention is particularly suited to coal power plants.
a a 7) ij~p: 4.
*o 4 4 .4 9, COMBINED GAS AND STEAM TURBINE POWER PLANT The invention relates to a combined gas and steam turbine power plant having an upstream coal gasifier and a gas-cooling and gas-cleaning plant downstream of the coal gasifier.
Combined gas and steam turbine power plants having upstream coal gasifiers are known. In such combined gas and steam turbine power plants, the coal is converted in the coal gasifier by the use of an oxygen/steam or air/steam mixture as a gasification f, .O means. The crude gas produced is cooled, if necessary after being quenched, in heat exchangers with 0 simultaneous steam generation, and the cooled crude gas is subjected to gas cleaning. Particles of dust and 15 ash, as well as sulphur compounds, are removed from the crude gas in the course of the gas cleaning. The cleaned gas, also called pure gas, is usually reheated and fed to a gas turbine.
ar*, Fixed bed coal gasifiers are distinguished from 20 other gasification systems in that, depending on the precess, a very large proportion of the coal energy in a the form of chemically bonded energy is contained in the fuel gas produced and only a relatively small proportion of the energy is converted into latent 25 heat. Because of the lower gasification temperature compared to other gasification systems, tars, oils and naphtha are obtained which condense in the gas-cooling and gas-cleaning plant. There are known methods wherein the tar fractions obtained, as well as oils and naphtha, are recycled tLo the gasifier to be cracked, gasified and partly burnt therein in order to contribute to an increase in the yield of crude gas.
A method is also known wherein the oil and naphtha fractions obtained are sold as products or are supplied for a separate use. The combustible condensates can, for example, be used for undergrate firing of process -2steam generators.
However all of these known processes, in the case of a combined gas and steam turbine power plant, result in the chemical energy of the naphtha and oil fractions in the gas turbine only being able to be partly used or being not used at all. Based on the energy of the coal, all these processes represent energetic and exergonic sources of loss, which restrict the overall attainable efficiency.
The underlying object of the present invention, oOo therefore, is to increase the o ,erall efficiency of the conversion of coal into electrical energy, in a i" combined gas and steam turbine power plant having an 44 40 S upstream coal gasifier.
15 According to the present invention, there is provided a combined gas and steam turbine power plant comprising an upstream coal gasifier and a gas-cooling and gas-cleaning plant downstream of the coal gasifier, 4 *1 the plant further comprising means whereby the tar S"°o 20 fraction obtained during the gas-cooling and gascleaning can be recycled to the coal gasifier for the purpose of being cracked, gasified and partial burnt therein, and means whereby the naphtha and oil fractions thus obtained can be used as additional fuel 4o 25 for the gas turbine.
Preferably, the plant comprises means whereby the naphtha and oil fractions continuously obtained can be continually mixed with the cleaned and reheated fuel gas. In this case, the plant preferably comprises means whereby the naphtha and oil fractions obtained can be heated to the approximate temperature of the fuel gas before being mixed with the cleaned fuel gas.
Preferably, the plant comprises means whereby the naphtha and oil fractions condensed-out can be introduced into a store and according to requirements fed to a combustion chamber of the gas turbine. In r ~111~ 1-c~ i esy -3this case, the plant preferably comprises means whereby the naphtha and oil fractions can be injected directly into the combustion chamber of the gas turbine as liquid fuel. Alternatively, the plan, preferably comprises means whereby the naphtha and oil portions, following prior vaporization, can be mixed with the fuel gas of the gas turbine.
In another preferred embodiment, the plant comprises means whereby the continuously obtained naphtha and oil fractions can be continually injected directly into the combustion chamber of the gas 4 4 turbine.
Preferably the coal gasified is a fixed bed coal S" gasifier.
,15 The invention is particularly suited to coal power plan's.
Thus according to the invention, the tar fractions obtained during gas-cooling and gas-cleaning are recycled to the coal gasifier for the purpose of S 20 cracking, gasifying or partial combustion, and the naphtha and oil fractions obtained are used as 4 o additional gas turbine fuel. By this measure, the full heat value of the naphtha and oil fractions for the generation of electrical energy is obtained without further loss with regard to gas generation. The overall efficiency of the combined gas and steam 4 4 1 turbine power plant having the upstream coal gasifier is clearly improved by this process compared to other known systems.
In an advantageous embodiment of the invention, the naphtha and oil fractions, continuously obtained, can be continually mixed with the cleaned and reheated fuel gas. This has the result that the heat value of the fuel gas is raised and in this way the chemically bonded energy delivered to the gas turbine is increased.
r* L. 1 -4- In a particularly advantageous embodiment of the invention, the naphtha and oil fractions condensed-out can be introduced into a store and, according to requirements, led to the combustion chamber of the gas turbine. Thus, the naphtha and oil fractions can be held back in the case of a part-load and then used in the event of a full-load, an over-load or a sudden load increase. A more flexible reaction to fluctuations in the load can thus be achieved than was possible by reversal of the coal gasifier and of the air-separation to*00 plant upstream thereof. Moreover the naphtha and oil I fractions in the store can be used for starting the turbine instead of the auxiliary fuels otherwise 00 00 required.
S" 15 Further details of the invention are illustrated i by the exemplary embodiment represented in the Figure, which shows a schematic representation of a combined gas and steam turbine power plant according to the ;o invention having an upstream fixed bed coal gasifier.
20 The combined gas and steam turbine power plant 1 shown in the drawing consists of a gas turbine power Splant 2 and a steam turbine power plant 8. In the gas turbine power plant, there are located a gas turbine 3 and associated air compressor 4 and generator 5 and a S: 25 combustion chamber 7 upstream of the gas turbine 3 and I "o3 attached to a fresh air line 6 of the air compressor 4.
In the steam turbine power plant 8, there are located a waste heat steam generator 10 attached to a waste gas line 9 of the gas turbine power plant 2, a flue 11 downstream on the waste gas side, and a steam turbine 12 and associated generator 13 and condenser 14.
Tn the Figure, a coal gasifier 15 is also shown, in the present embodiment a fixed bed gasifier 15, and gas-cooling and gas-cleaning plant 16 is located downstream of the coal gasifier 15. The gas-cooling and gas-cleaning plant 16 is attached to the combustion jl r* ft ft. t I' I 1 chamber 7 of the gas turbine power plant 2 by a pure gas line 17. Moreover, a waste water treatment plant 18 and an oil and naphtha store 19 are associated with the gas--cooling and gas-cleaning plant 16.
When the combined gas and steam turbine power plant 1 with the upstream coal gasifier 15 is in operation, steam 27 and coal by way of the fuel line (either separately or, in some cases, together) and oxygen 21 as gasification means from an air-separation plant (not shown) are delivered to the coal gasifier The crude gas obtained by the gasification is delivered to the gas-cooling and gas-cleaning plant 16.
The slag obtained by the gasification is removed separately by way of an outlet line 22. In the gas- 15 cooling and gas-cleaning plant 16, on the crude gas side, downstream of the coal gasifier, the gas is separated from the dust, ash, sulphur, tar, oil and naphtha fractions thereof and delivered as pure gas by way of the pure gas line 17 to the combustion chamber 7 20 of the combined gas and steam turbine power plant 1.
It is burnt in the combustion chamber by the use of compressed fresh air from the air compressor 4. The hot waste gas of the gas turbine 3 is extracted in a known way in the waste heat boiler 10 for the 25 generation of steam for use in the steam turbine 12 of the steam turbine power plant 8.
The tar fraction obtained by the gas-cooling and gas-cleaning are recycled by way of a return line 23 to the gasifier 15. They are then cracked, gasified 30 and partly burned, the resulting products being accordingly present in the crude gas issuing from the coal gasifier 15. In the illustrated embodiment, the oil and naphtha fractions condensed-out during the gascooling are delivered to an oil and naphtha store 19 by way of a separate line 24. The fuel collecting in the oil and naphtha store 19 can be delivered to the 41 4 4 '4 4 l 4 r It 4 I I 1 4 -6combustion chamber 7 of the gas turbine 3 for starting the gas turbine 3 or as an additional fuel when the gas turbine 3 is operating under full load. Even in the case of sudden increases in load, the performance of the gas and steam turbine power plant 1 can be raised relatively quickly by use of the fuel from the store 19. Auxiliary fuels such as natural gas and oil, which are in some cas-s required for starting the gas and steam turbine power plant, are thus not required.
The supply of oil and naphtha fractions as liquid fuel, to the combustion chamber 7 of the gas turbine 3 I I can be effected by way of an auxiliary line 25. In this case, oil and naphtha are injected directly into o* the combustion chamber 7. It is also possible, t «15 however, to heat these oil and naphtha fractions by use of a separate heat exchanger 26, shown by dotted lines, and to add these fractions as a gas to the pure gas flowing into the combustion chamber 7 of the gas a O turbine 3.
°o*lg 20 A particular advantage of this arrangement is that a larger proportion of chemically bonded fuel energy, in relation to the coal energy used, can by fed to the combustion chamber 7 of the gas turbine 3, than in the case of all other known procusses. By the reduction of 0 4 4 0, 25 the energy loss achieved in this way and the thermodynamically advantageous increase in the performance of the gas turbine, a clear improvement in the overall efficiency is achieved. This is particularly so in the case of fixed bed coal gasifiers.
Claims (6)
1. A combined gas and steam turbine power plant i comprising an upstream coal gasifier and a gas-cooling and gas-cleaning plant downstream of the coal gasifier, the plant further comprising means whereby the tar fraction obtained during the gas-cooling and gas- cleaning can be recycled to the coal gasifier for the I purpose of being cracked, gasified and partial burnt j therein, and means whereby the naphtha and oil fractions thus obtained can be used as additional fuel it ifor the gas turbine. i 2. A plant according to Claim 1, comprising ,b means whereby the naphtha and oil fractions i continuously obtained can be continually mixed with the 15 cleaned and reheated fuel gas. i,,i 3. A plant according to Claim 1, comprising means whereby the naphtha and oil fractions condensed- out can be introduced into a store and according to 4 requirements fed to a combustion chamber of the gas 20 turbine.
4. A plant according to Claim 3, comprising AI means whereby the naphtha and oil fractions can be injected directly into the combustion chamber of the gas turbine as liquid fuel. i 25 5. A plant according to Claim 3, comprising Smeans whereby the naphtha and oil portions, following prior vaporization, can be mixed with the fuel gas of the gas turbine.
6. A plant according to Claim 2, comprising fp 30 means whereby the naphtha and oil fractions obtained can be heated to the approximate temperature of the fuel gas before being mixed with the cleaned fuel gas.
7. A plant according to Claim 1, comprising means whereby the continuously obtained naphtha and oil fracti- ns can be continually injected directly into the combustion chamber of the gas turbine. i
8. A plant according to any of Claims 1 to 7, wherein the coal gasifier is a fixed bed coal gasifier.
19. A plant according to Claim 1, substantially 4 as hereinbefore described with reference to, and as shown in, the drawing. I DATED this SEVENTEENTH day of MARCH 988 Siemens Aktiengesellschaft Patent Attorneys for the Applicant SPRUSON FERGUSON
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3709469 | 1987-03-23 | ||
| DE19873709469 DE3709469A1 (en) | 1987-03-23 | 1987-03-23 | COMBINED GAS AND STEAM TURBINE POWER PLANT |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| AU1335388A AU1335388A (en) | 1988-09-22 |
| AU596505B2 true AU596505B2 (en) | 1990-05-03 |
Family
ID=6323773
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU13353/88A Ceased AU596505B2 (en) | 1987-03-23 | 1988-03-22 | Combined gas and steam turbine power plant |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP0284853B1 (en) |
| AT (1) | ATE72299T1 (en) |
| AU (1) | AU596505B2 (en) |
| DE (2) | DE3709469A1 (en) |
| ES (1) | ES2028919T3 (en) |
| IN (1) | IN169897B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2253407B (en) * | 1991-03-06 | 1994-11-16 | British Gas Plc | Electrical power generation |
| GB2253406B (en) * | 1991-03-06 | 1994-11-16 | British Gas Plc | Electrical power generation |
| EP0953627A1 (en) * | 1998-04-28 | 1999-11-03 | Ansaldo Volund A/S | Method and apparatus for, in a fixed-bed gasifier, converting tar and possibly particles into combustible gas components |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4092825A (en) * | 1975-09-15 | 1978-06-06 | Chevron Research Company | Process for base-load and peak-load power generation |
| US4150953A (en) * | 1978-05-22 | 1979-04-24 | General Electric Company | Coal gasification power plant and process |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4101294A (en) * | 1977-08-15 | 1978-07-18 | General Electric Company | Production of hot, saturated fuel gas |
-
1987
- 1987-03-23 DE DE19873709469 patent/DE3709469A1/en not_active Withdrawn
-
1988
- 1988-03-10 ES ES198888103807T patent/ES2028919T3/en not_active Expired - Lifetime
- 1988-03-10 AT AT88103807T patent/ATE72299T1/en active
- 1988-03-10 EP EP88103807A patent/EP0284853B1/en not_active Expired - Lifetime
- 1988-03-10 DE DE8888103807T patent/DE3868105D1/en not_active Expired - Fee Related
- 1988-03-16 IN IN222/CAL/88A patent/IN169897B/en unknown
- 1988-03-22 AU AU13353/88A patent/AU596505B2/en not_active Ceased
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4092825A (en) * | 1975-09-15 | 1978-06-06 | Chevron Research Company | Process for base-load and peak-load power generation |
| US4150953A (en) * | 1978-05-22 | 1979-04-24 | General Electric Company | Coal gasification power plant and process |
Also Published As
| Publication number | Publication date |
|---|---|
| DE3709469A1 (en) | 1988-10-06 |
| DE3868105D1 (en) | 1992-03-12 |
| ES2028919T3 (en) | 1992-07-16 |
| AU1335388A (en) | 1988-09-22 |
| IN169897B (en) | 1992-01-04 |
| EP0284853B1 (en) | 1992-01-29 |
| ATE72299T1 (en) | 1992-02-15 |
| EP0284853A1 (en) | 1988-10-05 |
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