KR101758475B1 - Power generation system for low heating value fuel - Google Patents
Power generation system for low heating value fuel Download PDFInfo
- Publication number
- KR101758475B1 KR101758475B1 KR1020150171384A KR20150171384A KR101758475B1 KR 101758475 B1 KR101758475 B1 KR 101758475B1 KR 1020150171384 A KR1020150171384 A KR 1020150171384A KR 20150171384 A KR20150171384 A KR 20150171384A KR 101758475 B1 KR101758475 B1 KR 101758475B1
- Authority
- KR
- South Korea
- Prior art keywords
- fuel
- gas
- working gas
- compressor
- heater
- Prior art date
Links
- 239000000446 fuel Substances 0.000 title claims abstract description 57
- 238000010248 power generation Methods 0.000 title abstract description 10
- 238000010438 heat treatment Methods 0.000 title description 2
- 238000002485 combustion reaction Methods 0.000 claims abstract description 24
- 238000000034 method Methods 0.000 claims description 13
- 238000011084 recovery Methods 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 87
- 239000006227 byproduct Substances 0.000 description 8
- 239000000567 combustion gas Substances 0.000 description 4
- 239000007800 oxidant agent Substances 0.000 description 4
- 238000009628 steelmaking Methods 0.000 description 4
- 239000002028 Biomass Substances 0.000 description 3
- 239000002440 industrial waste Substances 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 239000000356 contaminant Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000011819 refractory material Substances 0.000 description 2
- 239000002918 waste heat Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Images
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
- F02C7/00—Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for jet-propulsion plants
- F02C7/22—Fuel supply systems
-
- 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
- F02C6/00—Plural gas-turbine plants; Combinations of gas-turbine plants with other apparatus; Adaptations of gas-turbine plants for special use
-
- 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
- F02C7/00—Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for jet-propulsion plants
- F02C7/22—Fuel supply systems
- F02C7/224—Heating fuel before feeding to the burner
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23R—GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY, e.g. GAS-TURBINE COMBUSTION CHAMBERS
- F23R3/00—Continuous combustion chambers using liquid or gaseous fuel
- F23R3/28—Continuous combustion chambers using liquid or gaseous fuel characterised by the fuel supply
-
- F02W2746/00197—
-
- F02W2746/00947—
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2220/00—Application
- F05D2220/70—Application in combination with
- F05D2220/75—Application in combination with equipment using fuel having a low calorific value, e.g. low BTU fuel, waste end, syngas, biomass fuel or flare gas
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Air Supply (AREA)
Abstract
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power generation device for a low calorific value fuel, comprising: a compressor for compressing a working gas; A combustion preheater and a working gas heater therein, the working gas heater being connected to the outlet of the compressor; A gas turbine in which an operating gas heated by an operating gas heater is drawn in and driven; And a generator connected to the gas turbine, wherein the working gas discharged from the gas turbine and the fuel preheated through the fuel preheater are configured to be combusted in the furnace so that heat recovery is performed in the Brayton cycle to increase the efficiency of the cycle And the fuel is preheated and combusted without compressing the fuel, thereby improving the combustibility and simplifying the structure of the apparatus.
Description
The present invention relates to a power generation device for a low calorific value fuel such as by-product gas discharged from an industrial waste, a biomass, a steelmaking process or the like, which is difficult to be burned due to a low calorific value or is low in combustion temperature,
Gas turbines are well known as devices for generating power. Such a gas turbine is operated by a heated and compressed working gas to drive a shaft for operating the generator. This working gas is heated by heat resulting from the combustion of air and fuel and is compressed by a compressor coupled to the gas turbine.
Conventional gas turbines are limited to expensive refined fuels such as distillates or natural gas. Fuel used in gas turbines is a fuel with a generally high calorific value, that is, a calorific value of 2,400 kcal / Nm 3 or more.
The byproduct gas emitted from industrial processes such as industrial wastes, biomass, or steelmaking processes is often lower in calorific value than ordinary fuels. In this case, stable combustion is not possible or spontaneous combustion is impossible.
In addition, in the case of producing power by burning the by-product gas, since the flame temperature is low, there is a disadvantage that high-efficiency power generation is not easy.
In order to stably combust such a low calorific value combustible fuel, it is one of the measures to preheat and increase the combustibility before combustion.
(Patent Document 1) KR 2011-0041170 A
Accordingly, the present invention provides a power generation device for a low calorific value fuel which can provide a utilization method for a low calorific value energy source having a low utilization value by combining a preheating process for a low calorific value fuel with a Brayton cycle There is a main purpose in doing this.
A power generating apparatus according to an embodiment of the present invention includes: a compressor for compressing an operating gas; A fuel preheater and a working gas heater therein, the working gas heater being connected to the outlet of the compressor; A gas turbine in which a working gas heated by the working gas heater flows and is driven; And a generator connected to the gas turbine, wherein the combustion furnace further includes a burner, and the working gas discharged from the gas turbine and the fuel preheated through the fuel preheater are supplied to the burner, .
As described above, according to the present invention, it is possible to increase the efficiency of the cycle by performing the heat recovery in the Brayton cycle, and by preheating and burning the fuel (in the case of gas) without compressing it, The effect of simplifying the configuration of the apparatus can be obtained.
1 is a view schematically showing the construction of a low-calorific-power fuel generator according to an embodiment of the present invention.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.
1 is a schematic view showing the construction of a low-calorific-value fuel generator according to an embodiment of the present invention. As shown therein, the low-calorific power generator for a fuel according to an embodiment of the present invention includes: A compressor (3) for compressing the gas (G); A fuel preheater (6) and an operating gas heater (5) are provided therein, the working gas heater having a combustion furnace (4) connected to the outlet of the compressor; A gas turbine (1) in which a working gas heated by an operating gas heater is introduced and driven; And a generator (2) connected to the gas turbine, wherein the working gas discharged from the gas turbine and the fuel (F) preheated through the fuel preheater are combusted in the furnace.
The power generation apparatus of the present invention is constituted by a Brayton cycle comprising a gas turbine (1), a generator (2) and a compressor (3).
The compressor (3) introduces working gas (G) into the inlet and compresses it to a high pressure. The working gas in the present invention is preferably outside air, that is, air. However, it is not necessarily limited thereto and other operating gases may be used.
The compressed but not heated operating gas G is sent from the outlet of the
The combustion furnace (4) serves to burn the working gas (G) discharged from the gas turbine (1) with the oxidizing agent for the fuel of low calorific value. Preferably, the inner wall of the combustion furnace is covered with a refractory material, and the fuel and the oxidizer are mixed in the space surrounded by the refractory material, thereby causing combustion reaction, thereby releasing heat.
This combustion furnace 4 may include a burner 7 for making it possible to adjust the output of the furnace so as to easily adapt to the amount of heat release of the fuel. The furnace operates at or near atmospheric pressure to limit corrosiveness and high temperatures.
The combustion furnace 4 also includes a fuel preheater 6 and an operating gas heater 5 which are each constituted by a heat exchanger or a heat exchanger aggregate so that the combustion gas H And sequentially transfers heat energy to the working gas (G) and the fuel (F) to raise the temperature.
Here, during the initial operation of the combustion furnace 4, different fuels and oxidants are supplied to the burner and burned, or thermal energy is transferred to the working gas G and the fuel F by any other heating means, It is possible to operate the furnace in the above-described manner after the fuel F is preheated.
After the working gas G is compressed to a predetermined pressure by the
The gas turbine 1 drives the shaft 9 and drives the generator 2 through the shaft. The generator converts the mechanical energy of the gas turbine into electrical energy.
Since the gas turbine 1 is provided on the same axis as the
In the power generation apparatus of the present invention, the working gas G discharged from the gas turbine 1 is supplied to the burner 7 of the combustion furnace 4. Indeed, if a heated working gas of a gas turbine is used as the oxidizing agent in the furnace, the overall performance of the present invention can be improved beyond conventional gas turbines.
The low calorific value fuel (F) that can be used in the power generation apparatus of the present invention may be in the form of solid or liquid such as industrial waste or biomass, or may be in a gaseous state such as byproduct gas generated therefrom. In this specification, by-produced gas generated in an industrial process such as a steelmaking process is described as an example of a fuel.
The low-calorific fuel F used in the power generating apparatus of the present invention is a by-product gas in a steelmaking process which occurs in the process of blowing oxygen into the molten steel in the
The power generation apparatus of the present invention includes the fuel preheater 6 together with the combustion furnace 4 so that such low calorific value fuel F can be spontaneously combusted.
The fuel F supplied from the
The preheated fuel F and the working gas G discharged from the gas turbine 1 as described above are supplied to the burner 7 of the combustion furnace 4 and burned together. At this time, the operating gas is heated to the required temperature at the inlet of the gas turbine with the generated combustion gas (H), and the fuel is preheated so as to have a calorific value capable of burning in the burner.
The low byproduct gas that can be used as fuel is usually discharged with contaminants, including undesirable gaseous components. Accordingly, processes and devices capable of removing such undesirable components or contaminants can be employed, and such processes and devices are well known in the art and will not be described in detail herein. However, it is recommended that low-grade fuels be subjected to such treatment upstream of the combustion furnace.
On the other hand, the regenerator 8 can be disposed between the outlet of the
In this regenerator 8, the high temperature working gas discharged from the gas turbine 1 and the working gas compressed in the
Thus, by lowering the temperature of the exhaust gas finally discharged to the outside of the cycle, the thermal efficiency of the Brayton cycle can be increased as a whole.
Therefore, according to the present invention, it is possible to preheat the fuel (F) such as by-product gas which is difficult to spontaneously burn due to a low calorific value to enhance the combustibility and to use the high temperature working gas (G) discharged from the gas turbine Thereby providing an advantage that the combustion can be easily performed.
Further, the waste heat that is finally discharged in the Brayton cycle is reduced through the heat recovery process, thereby improving the cycle efficiency.
That is, the exhaust gas finally discharged from the electric power generating apparatus of the present invention is the combustion gas H discharged to the atmosphere from the fuel pre-heater 6 and the working gas G of the gas turbine 1 discharged from the regenerator 8 , The waste heat of the cycle can be minimized since the working gas and the fuel are heat-recovered for these gases.
The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.
1: gas turbine 2: generator
3: compressor 4: combustion furnace
5: Working gas heater 6: Fuel preheater
7: Burner 8: Player
9: shaft 10: converter
Claims (7)
A fuel preheater and a working gas heater therein, the working gas heater being connected to the outlet of the compressor;
A gas turbine in which a working gas heated by the working gas heater flows and is driven; And
A generator connected to the gas turbine
Lt; / RTI >
Wherein the combustion furnace further comprises a burner,
Wherein the working gas discharged from the gas turbine and the fuel preheated through the fuel preheater are supplied to the burner and burned in the furnace.
Wherein the fuel supplied to the fuel pre-heater is a gas produced in another process.
Wherein the fuel has a calorific value of 400 to 600 kcal / Nm < 3 & gt ;.
Wherein the fuel pre-heater and the working gas heater are heat exchangers.
Further comprising a regenerator disposed between the outlet of the compressor and the working gas heater for preheating the compressed working gas in the compressor.
Wherein the regenerator is supplied with the working gas discharged from the gas turbine and heat exchange occurs between the working gas discharged from the gas turbine and the working gas compressed in the compressor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020150171384A KR101758475B1 (en) | 2015-12-03 | 2015-12-03 | Power generation system for low heating value fuel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020150171384A KR101758475B1 (en) | 2015-12-03 | 2015-12-03 | Power generation system for low heating value fuel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| KR20170065705A KR20170065705A (en) | 2017-06-14 |
| KR101758475B1 true KR101758475B1 (en) | 2017-07-17 |
Family
ID=59217965
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR1020150171384A KR101758475B1 (en) | 2015-12-03 | 2015-12-03 | Power generation system for low heating value fuel |
Country Status (1)
| Country | Link |
|---|---|
| KR (1) | KR101758475B1 (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101159661B1 (en) * | 2009-09-28 | 2012-06-25 | 현대제철 주식회사 | Combustion apparatus for gas of furnace |
| US20130111920A1 (en) * | 2011-11-04 | 2013-05-09 | Flexenergy, Inc. | Controls for multi-combustor turbine |
-
2015
- 2015-12-03 KR KR1020150171384A patent/KR101758475B1/en active IP Right Grant
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101159661B1 (en) * | 2009-09-28 | 2012-06-25 | 현대제철 주식회사 | Combustion apparatus for gas of furnace |
| US20130111920A1 (en) * | 2011-11-04 | 2013-05-09 | Flexenergy, Inc. | Controls for multi-combustor turbine |
Also Published As
| Publication number | Publication date |
|---|---|
| KR20170065705A (en) | 2017-06-14 |
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