JP5040489B2 - Online cleaning method for gas compressor for gas turbine - Google Patents

Description

  The present invention relates to a gas turbine (by-product gas turbine) in which by-product gas (for example, blast furnace gas) generated in an iron making process is burned as fuel to recover the energy stored in the by-product gas. The present invention relates to a method for online cleaning of a compressor (gas compressor for by-product gas turbine, by-product gas compressor) that is provided on the side and compresses by-product gas.

  In the steelmaking process, various by-product gases are generated from coke ovens, blast furnaces, converters, etc. As an effective use of these by-product gases, gas turbines using by-product gas as fuel (by-product gas turbine) It generates electricity by operating and recovers energy held by by-product gas.

  In such a by-product gas turbine, after the supplied by-product gas is removed by a dust collector, the by-product gas turbine is driven by compressing it by a by-product gas compressor and then burning it by a combustor. .

  At that time, since the by-product gas contains a considerable amount of dust and moisture even after dust removal, dust adheres to the stationary and moving blades and the inner wall of the by-product gas compressor, and the by-product gas compressor The insulation efficiency is reduced. For this reason, the by-product gas turbine must be stopped periodically, and dust adhering to the stationary blades of the by-product gas compressor must be cleaned and removed using a heated fluid or high-pressure water.

On the other hand, Patent Documents 1 and 2 propose removing dust adhering to a stationary blade of a gas compressor by injecting dry ice particles into the gas compressor during operation of the gas turbine. Has been. By this method, it is possible to remove dust adhering to the stationary blades of the gas compressor without stopping the gas turbine.
Japanese Patent Laid-Open No. 10-220251 JP 2005-226464 A

  As described in Patent Documents 1 and 2, the method of injecting dry ice particles into the gas compressor can remove dust adhering to the stationary blades of the gas compressor without stopping the gas turbine. Although there is a great merit that it can be done, it is necessary to purchase dry ice separately at that time, and there is a problem that costs are increased.

  The present invention has been made in view of the above circumstances, and in a gas turbine using as a by-product gas generated in an iron-making process as a fuel, a gas compressor that compresses the by-product gas on the inlet side of the gas turbine. It is an object of the present invention to provide an on-line cleaning method for a gas turbine gas compressor that can perform cleaning of the gas turbine more efficiently.

  In order to solve the above problems, the present invention has the following features.

[1] During operation of a gas turbine that uses by-product gas generated in an iron-making process as fuel, dry ice particles are injected into a by-product gas compressor provided on the inlet side of the turbine, and the compressor blades And / or an on-line cleaning method for a gas turbine gas compressor for removing dust adhering to an inner wall,
And energy recovered from the product gas Oyo exhaust gas generated by the beauty steelmaking processes generated in steelmaking process, carbon dioxide the recovered directly from the by-product gas, and, using carbon dioxide recovered from the exhaust gas, the An on-line cleaning method for a gas turbine gas compressor, characterized by producing dry ice grains.

[2] using the energy recovered from the product gas Oyo originator of the exhaust gas supplied to the gas turbine, gas turbine gas according to [1], characterized in that to produce the dry ice grain Online cleaning method for compressors.

[3] A power generation process using a by-product gas as a fuel to generate power with a gas turbine, a carbon dioxide recovery process for directly recovering carbon dioxide from the by-product gas and recovering carbon dioxide from exhaust gas generated in the power generation process, A dry ice production process for producing dry ice grains using carbon dioxide collected in the carbon recovery process, and a dry ice grain injection process for injecting dry ice grains produced in the dry ice production process into a by-product gas compressor The on-line cleaning method for a gas compressor for a gas turbine according to the above [1] or [2], comprising:

  [4] The gas turbine gas compressor online cleaning method according to [3], wherein the power generated in the power generation step is used in the carbon dioxide recovery step and the dry ice production step.

[5] A first power generation process for generating power with a gas turbine using by-product gas as a fuel, a second power generation process for generating power using the exhaust gas generated in the first power generation process, and carbon dioxide from the by-product gas Of carbon dioxide from the exhaust gas after being used in the second power generation process, and dry ice manufacturing that produces dry ice grains using the carbon dioxide recovered in the carbon dioxide recovery process The gas according to [1] or [2], further comprising: a step of injecting dry ice particles produced in the dry ice production step into a by-product gas compressor Online cleaning method for turbine gas compressors.

  [6] The carbon dioxide recovery step and the dry ice production step use the power generated in the first power generation step and / or the power generated in the second power generation step. Online cleaning method for gas compressors for gas turbines.

  In the present invention, since dry ice is produced using by-product gas and / or exhaust gas generated in the iron making process, there is no need to purchase dry ice separately. Online cleaning can be performed efficiently. Thereby, the amount of carbon dioxide released into the atmosphere can be reduced.

  An embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a configuration diagram of an online cleaning system for a gas turbine gas compressor used in an embodiment of the present invention.

  The online cleaning system for a gas compressor used in this embodiment relates to a by-product gas turbine facility for recovering retained energy of a by-product gas (coke oven gas, blast furnace gas, converter gas, etc.) generated in an iron making process. The by-product gas compressor disposed in the by-product gas turbine equipment is cleaned online.

  As shown in FIG. 1, this gas compressor online cleaning system includes a by-product gas turbine facility 1 including a by-product gas compressor 2, a by-product gas turbine 3, and a generator 4, and an exhaust from the by-product gas turbine 3. A heat exchanger 5 that exchanges heat between the carbon dioxide-containing exhaust gas and the boiler pure water, a steam turbine 7 that uses steam of the boiler pure water, a steam turbine facility 6 that includes a generator 8, and an exhaust gas compressor 9, A carbon dioxide recovery facility 10 for recovering carbon dioxide (carbon dioxide) from the exhaust gas compressed by the exhaust gas compressor 9, a carbon dioxide liquefier 11 for liquefying the recovered carbon gas, and liquefied carbon dioxide A liquefied carbon dioxide recovery tank 12 for recovering the dry ice, a dry ice manufacturing apparatus 13 for manufacturing dry ice using the recovered liquefied carbon dioxide gas, and the manufactured dry eye A dry ice recovery tank 14 for recovering the exhaust gas, a diffusion tower 15 for releasing unnecessary exhaust gas to the atmosphere, and a flow rate for distributing the exhaust gas that has passed through the heat exchanger 5 to the exhaust gas compressor 9 and the diffusion tower 15 The adjustment valve 21 and the flow rate adjustment valve 22 for adjusting the amount of exhaust gas sent from the carbon dioxide recovery facility 10 to the diffusion tower 15 are configured.

  The carbon dioxide recovery facility 10, the carbon dioxide liquefaction device 11, the dry ice production device 13, and the like used to produce dry ice from the exhaust gas are used as a by-product gas and its exhaust gas in the by-product gas turbine facility 1 and steam turbine facility 6. It comes to operate with a part of the energy (electric energy) recovered from the stored energy.

  As the carbon dioxide recovery facility 10, a known carbon dioxide recovery technique can be adopted as appropriate. For example, PSA method (pressure swing adsorption method), membrane separation method, and the like.

  Moreover, as the carbon dioxide gas liquefying apparatus 11, a known carbon dioxide liquefaction technique can be appropriately employed. For example, the compressed carbon dioxide gas is adiabatically expanded to be cooled and liquefied.

  Moreover, as the dry ice manufacturing apparatus 13, a well-known dry ice manufacturing technique can be employed as appropriate. For example, liquefied carbon dioxide gas is adiabatically expanded to produce snowy dry ice, and the snowy dry ice is press-molded to produce dry ice particles.

  And in the online cleaning system of the gas compressor comprised as mentioned above, online cleaning of the byproduct gas compressor 2 is performed as follows.

  First, the by-product gas generated in the iron making process is supplied to the by-product gas compressor 2, compressed by the by-product gas compressor 2, then supplied to the by-product gas turbine 3, and combusted in the combustor for by-product. The raw gas turbine 3 is driven and power is generated by the generator 4.

  The combustion exhaust gas (carbon dioxide-containing exhaust gas) discharged from the by-product gas turbine 3 is subjected to heat exchange with the boiler pure water in the heat exchanger 5 and then supplied to the exhaust gas compressor 9 for compression and Boosted.

  On the other hand, the boiler pure water steam exchanged with the exhaust gas by the heat exchanger 5 is supplied to the steam turbine 7, drives the steam turbine 7, and the generator 8 generates power.

  Then, the exhaust gas compressed and pressurized by the exhaust gas compressor 9 is supplied to the carbon dioxide recovery facility 10, and carbon dioxide (carbon dioxide) is recovered from the exhaust gas.

  The recovered carbon dioxide gas is supplied to the carbon dioxide gas liquefying device 11, liquefied by the carbon dioxide gas liquefier 11, and then recovered in the liquefied carbon dioxide gas recovery tank 12.

  The liquefied carbon dioxide gas collected in the liquefied carbon dioxide gas collection tank 12 is supplied to the dry ice production device 13, and dry ice (dry ice particles) is produced by the dry ice production device 13. The produced dry ice is collected in the dry ice collection tank 14.

  Then, if necessary, during operation of the by-product gas turbine equipment 1, dry ice particles recovered in the dry ice recovery tank 14 are injected into the by-product gas compressor 2, and the blades of the by-product gas compressor 2 are injected. And / or dust adhering to the inner wall is removed.

  As described above, in this embodiment, cleaning energy is recovered from the by-product gas generated in the iron making process and its combustion exhaust gas, and carbon dioxide recovered from the by-product gas combustion exhaust gas. Since the ice grains are manufactured, it is not necessary to purchase dry ice separately, and online cleaning of the byproduct gas compressor 2 can be performed efficiently. Thereby, the amount of carbon dioxide released into the atmosphere can be reduced.

  In the above embodiment, the exhaust gas discharged from the by-product gas turbine 3 is used to generate power with the steam turbine 7 and carbon dioxide is recovered from the exhaust gas after being used for the power generation. Carbon dioxide may be directly recovered from the exhaust gas discharged from the raw gas turbine 3.

  Further, in the above, dry ice is produced using energy recovered from the byproduct gas (and its exhaust gas) supplied to the byproduct gas turbine facility 1 and carbon dioxide recovered from the exhaust gas. Dry ice may be produced by recovering energy and carbon dioxide from the exhaust gas generated in the production equipment (for example, steelmaking equipment, rolling equipment).

  In some cases, carbon dioxide may be directly recovered from the by-product gas.

It is a system configuration figure showing one embodiment of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 By-product gas turbine equipment 2 By-product gas compressor 3 By-product gas turbine 4 Generator 5 Heat exchanger 6 Steam turbine equipment 7 Steam turbine 8 Generator 9 Exhaust gas compressor 10 Carbon dioxide recovery equipment 11 Carbon dioxide liquefaction device 12 Liquefaction Carbon dioxide recovery tank 13 Dry ice production equipment 14 Dry ice recovery tank 15 Stripping tower 21 Flow rate adjustment valve 22 Flow rate adjustment valve

Claims (6)

During operation of a gas turbine that uses by-product gas generated in the iron making process as fuel, dry ice particles are injected into a by-product gas compressor provided on the inlet side of the turbine, and the compressor blades and / or An on-line cleaning method for a gas compressor for a gas turbine that removes dust adhering to an inner wall,
And energy recovered from the product gas Oyo exhaust gas generated by the beauty steelmaking processes generated in steelmaking process, carbon dioxide the recovered directly from the by-product gas, and, using carbon dioxide recovered from the exhaust gas, the An on-line cleaning method for a gas turbine gas compressor, characterized by producing dry ice grains. Using said energy recovered from by-product gases Oyo originator of the exhaust gas supplied to the gas turbine, the online gas turbine gas compressor according to claim 1, characterized in that to produce the dry ice grain Cleaning method. A power generation process that generates power with a gas turbine using by-product gas as fuel, a carbon dioxide recovery process that directly recovers carbon dioxide from the by-product gas, and recovers carbon dioxide from exhaust gas generated in the power generation process, and a carbon dioxide recovery process A dry ice production process for producing dry ice grains using the carbon dioxide recovered in step 1, and a dry ice grain injection process for injecting dry ice grains produced in the dry ice production process into a by-product gas compressor The on-line cleaning method of a gas compressor for a gas turbine according to claim 1 or 2.   The on-line cleaning method for a gas compressor for a gas turbine according to claim 3, wherein the power generated in the power generation step is used in the carbon dioxide recovery step and the dry ice production step. A first power generation process that generates power with a gas turbine using by-product gas as a fuel, a second power generation process that generates power using the exhaust gas generated in the first power generation process, and directly recovers carbon dioxide from the by-product gas as well as a dry-ice process of manufacturing the dry ice particles with a carbon dioxide recovery step of recovering carbon dioxide from flue gas after use in the second generation step, the carbon dioxide recovered in the carbon dioxide recovery process, The gas turbine gas compressor according to claim 1, further comprising a dry ice grain injection step of injecting dry ice particles produced in the dry ice production step into a by-product gas compressor. Online cleaning method.   6. The gas turbine according to claim 5, wherein in the carbon dioxide recovery process and the dry ice production process, the power generated in the first power generation process and / or the power generated in the second power generation process is used. Online cleaning method for gas compressors.

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