WO2000043658A1

WO2000043658A1 - Gas turbine generating method and generator

Info

Publication number: WO2000043658A1
Application number: PCT/JP2000/000098
Authority: WO
Inventors: Fumihiko Kiso; Shigeo Hatamiya; Takeo Komuro; Hirotsugu Fukuhara; Toru Akiyama; Atsushi Morihara; Yoshiki Noguchi
Original assignee: Hitachi, Ltd.
Priority date: 1999-01-25
Filing date: 2000-01-12
Publication date: 2000-07-27
Also published as: JP2000213371A

Abstract

A generating method and a generator that use gasified gas of carbon type fuel, such as coal or heavy oil, for a HAT cycle, wherein the gasified gas can be fed to a gas turbine combustor while the gasified gas is kept at high temperature, without lowering the temperature of the gasified gas to ordinary temperature. More specifically, the gasified gas, still containing a sulfur content, is introduced into the gas turbine combustor, where it is converted into sulfur dioxide, which is then introduced into the gas turbine. The sulfur dioxide in the gas is discharged from the gas turbine, whereupon it is contacted with aqueous slurry containing a desulfurizing agent and is recovered. Since the gasified gas still containing a sulfur content is introduced into the combustor, it is possible to introduce the gasified gas, kept at high temperature, into the burner.

Description

Specification

Gas turbine power generation method and power generation device

The present invention gasifies a carbon-based fuel such as coal or heavy oil using an oxidizing agent such as oxygen or water vapor, and converts a combustible gas mainly composed of carbon monoxide and hydrogen produced by gasification together with air. The present invention relates to a gas turbine power generation method and a gas turbine power generation apparatus that generate electricity by supplying gas turbine power generation equipment. In particular, a method of humidifying air supplied to a gas turbine and recovering energy of gas turbine exhaust gas using the humidified air. The present invention relates to a gas turbine power generation method and a gas turbine power generation device. Background art

In recent years, attention has been paid to a gas evening bin power generation system called a HAT (Humid Air Turbine) cycle. The HAT cycle is a method in which the air supplied to the gas turbine combustor is humidified, and the energy of the gas turbine exhaust gas is recovered using the humidified air. This method has the characteristics of relatively high thermal efficiency and low NOx generation, even though it is a single cycle that does not require a steam bin. Since the steam bin is not required, the system can be simplified, and the output of the gas bin increases because the flow rate of the working medium gas increases by the amount humidified by the steam.

The HAT cycle has hitherto attracted attention as one of the gas one-bottle power generation systems using natural gas as fuel. However, in recent years, for example, the “HAT (High Humidity Gas Evening Bin) cycle”, thermal nuclear power generation, Vol. As described in 43, No. 12, p. 1587-1593), there is a movement to use the HAT cycle in plants that gasify coal to generate power.

Publications describing the HAT cycle include, in addition to the above-mentioned publications, JP-B-11-31013 (US4, 537, 023), JP-A-9-222031, JP-A-10-110628, and the like. There is.

When power is generated using gasified gas of carbon-based fuel such as coal or heavy oil, hydrogen sulfide (H ₂ S) and carbonyl sulfide contained in the gasified gas are used.

The treatment of harmful and highly corrosive sulfur compounds such as (CO 2 S) becomes a problem. Many conventional coal gasification power plants convert carbon sulfide contained in gasification gas into hydrogen sulfide, absorb and remove hydrogen sulfide using an amine solution, and then introduce it into a gas turbine combustor. I've been. This coal gasification power plant requires a regeneration tower to separate and recover hydrogen sulfide from the amine solution, an incinerator that burns the recovered hydrogen sulfide and converts it to sulfur dioxide, and a desulfurization system for sulfur dioxide. It is necessary to have a wet desulfurization tower that absorbs with the agent and collects it as gypsum. Here, the conversion of carbonyl sulfide to hydrogen sulfide is due to the absence of an absorbing solution capable of absorbing carbonyl sulfide. Absorption of hydrogen sulfide by the amine solution does not proceed unless the temperature is low. For this reason, the temperature of the gasified gas must be reduced to around room temperature. In the case of a combined cycle equipped with both a gas turbine and a steam turbine, the heat lost by cooling the gas to normal temperature can be recovered as steam and used for the steam bin, but in the HAT cycle, Since there is no steam turbine, the recovered heat cannot be used in the cycle. Therefore, the HAT cycle that uses gasification gas of a carbon-based fuel such as coal or heavy oil has the advantage that high efficiency can be obtained in a single cycle, which is one of the features of the HAT cycle. There is a problem that cannot be done.

An object of the present invention is to provide a gas turbine power generation method and a gas turbine power generation device capable of supplying a gasification gas of a carbon-based fuel such as coal or heavy oil to a HAT cycle without lowering the temperature to a normal temperature. It is in. Disclosure of the invention

The present invention introduces a gasified gas of a carbon-based fuel such as coal or heavy oil into a gas turbine combustor while containing sulfur compounds such as hydrogen sulfide and carbonyl sulfide. The purpose is to convert the compound to sulfur dioxide and supply it to the gas turbine while containing the sulfur dioxide. In addition, the exhaust gas discharged from the gas turbine is brought into contact with water containing a desulfurizing agent to separate and recover sulfur dioxide from the exhaust gas, and at the same time, to separate and recover a part of the water.

According to the present invention, when introducing a gasified gas of a carbon-based fuel into a gas turbine combustor, it is not necessary to separate and remove sulfur compounds contained in the gas, so that the gas is introduced into the combustor at a high temperature. It becomes possible to do.

Embodiments of the present invention will be described below.

(1) A gasified gas, air and steam generated by gasifying a carbon-based fuel are introduced into a combustor to burn the gasified gas, and a gas turbine is driven using the obtained gas as a working medium. Gas turbine generating power

Introducing the gasified gas into the combustor in a state of containing the sulfur content, contacting the exhaust gas discharged from the gas turbine with water containing a desulfurizing agent, and separating and recovering the sulfur content from the exhaust gas. A gas turbine power generation method comprising: (2) In the gas turbine power generation method according to (1), the gasified gas is introduced into the combustor in a state containing hydrogen sulfide and luponyl sulfide, and the hydrogen sulfide and the sulfur sulfide are introduced into the combustor. It is characterized in that luponyl is converted into sulfur dioxide and then supplied to the gas turbine, and the exhaust gas exhausted from the gas turbine is brought into contact with water containing a sulfur dioxide absorbent to separate and recover sulfur dioxide from the exhaust gas. Gas turbine power generation method.

(3) Combustible gas, air, and water vapor are introduced into the combustor to burn the combustible gas, and the obtained gas is used as a working medium to drive a gas bin to generate power. In a gas turbine power generation method that cools turbine exhaust gas and separates and recovers a part of water,

A gaseous gas of a carbon-based fuel is used as a combustible gas to be supplied to the combustor, and the gasified gas is introduced into the combustor in a state of containing sulfur, and exhaust gas of the gas turbine is desulfurized. A gas turbine power generation method comprising contacting cooling water containing an agent to separate and recover sulfur and a part of water from the exhaust gas.

(4) A combustor that burns combustible gas in the presence of air and water vapor, a gas turbine that generates power using the gas obtained by the combustor as a working medium, and exhaust gas that is exhausted from the gas bin And a water recovery unit that cools and separates a part of the water.

A fuel supply system for introducing a gaseous gas of carbon-based fuel into the combustor while containing a sulfur content, wherein instead of the water recovery unit, exhaust gas of a gas turbine is brought into contact with water containing a desulfurizing agent; A gas turbine power generator comprising a water recovery and desulfurizer for separating and recovering sulfur and a part of water from the exhaust gas.

(5) In the gas evening bin power generator according to (4), the water recovery • The desulfurizer is provided with a liquid reservoir at the bottom so that the liquid in the liquid reservoir is recycled, and the pH of the liquid in the liquid reservoir is maintained in a range of 3.8 to 5.0. Means for generating electricity in a gas bin.

(6) In the gas bin generator according to (5), the inlet of the gas turbine exhaust gas to the water recovery / desulfurizer is connected to the liquid phase in the liquid reservoir and the gas phase above the liquid reservoir. And a controller for controlling a flow rate of the exhaust gas introduced into the liquid phase by a pH of the liquid in the liquid pool.

(7) The gas turbine power generator according to (6), further comprising a pH adjuster supply unit that supplies a PH adjuster to the liquid reservoir.

(8) A combustor, a gas turbine that generates power using the gas obtained in the combustor as a working medium, an air compressor that compresses air using the power of the gas turbine, and an air compressor A humidifier for adding water to the obtained compressed air to humidify the air, and heat-exchanging the compressed air humidified by the humidifier with exhaust gas exhausted from the gas evening bin to raise the temperature. A heat exchanger, wherein the humidified air heated by the heat exchanger is introduced into the combustor.

A fuel supply system for introducing a combustible gas containing sulfur into the combustor, wherein the gas turbine exhaust gas cooled by the heat exchanger is brought into contact with water mixed with a desulfurizing agent to remove sulfur components from the exhaust gas. A gas recycle bin that is equipped with a water recovery and desulfurizer that separates and recovers water and part of water.

(9) In the above (8), the apparatus further comprises a suspended matter removing device for removing the suspended matter in the water by introducing the recovered water separated and recovered by the water collecting / desulfurizing device. So that the recovered water from which the suspended matter has been removed is introduced into the humidifier. A gas turbine power generator, comprising:

(10) In the above (9), the humidifier is provided with a compressed air introduction part at a lower part, and sprays collected water from which suspended matter is removed by the suspended matter removing device at an upper part. Spray nozzle for collected water And a make-up water spray nozzle for spraying make-up water. The make-up water spray nozzle is provided above the recovered water spray nozzle, and the make-up water sprayed from the make-up water spray nozzle is provided. Wherein the spray nozzle for recovered water is cleaned.

(11) a combustor, a gas turbine that generates power using the gas obtained in the combustor as a working medium, and an air compressor that compresses air using the power of the gas bin. A humidifier for humidifying the air by adding moisture to the compressed air obtained by the air compressor; and heat-exchanging the compressed air humidified by the humidifier with exhaust gas exhausted from the gas turbine. A heat exchanger for heating the gas, wherein the humidified air heated by the heat exchanger is introduced into the combustor.

A fuel supply system for introducing a gaseous gas of a carbon-based fuel into the combustor; the fuel supply system includes a gasification furnace for a carbon-based fuel; and an ash component that mixes a gas produced by the gasification furnace into the gas. A gas cooling device for cooling so as not to adhere, a dust removing device for separating and removing ash and non-gasified carbon-based fuel mixed in the produced gas, and an ammonia for removing ammonia contained in the produced gas With a removal device,

The gas turbine exhaust gas cooled by the heat exchanger is brought into contact with water mixed with a desulfurizing agent, and a water recovery / desulfurizer is provided for separating and recovering a part of sulfur and moisture from the exhaust gas. Gas turbine generator.

(12) The gas turbine power generator according to the above (8), wherein the gas After the heat exchange between the turbine exhaust gas and the humidified air, the gas turbine exhaust gas and the water recovery are subjected to heat exchange with the gas from which the sulfur content and a part of the water have been removed by the desulfurizer. A gas turbine power generator comprising a heat exchanger for increasing the temperature of a gas processed by a desulfurizer.

(13) The gas turbine power generator according to the above (8), further comprising a gas-liquid contact device for bringing the exhaust gas from the gas bin into contact with a water slurry containing a desulfurizing agent above the water recovery / desulfurizer, A gas turbine power generator, wherein a liquid reservoir is provided at a bottom portion, and a part of the liquid in the liquid reservoir is extracted and circulated to the gas-liquid contact device.

(14) The gas turbine power generator according to the above (13), further comprising a suspended matter removing device for separating and removing suspended substances contained in the recovered water separated and recovered by the water recovery / desulfurizer. A part of the recovered water treated by the suspension removal device is introduced into the humidifier, and a desulfurizing agent is added to the remaining recovered water and circulated through the gas-liquid contact device. A gas turbine power generator, characterized in that:

(15) In the gas turbine power generator according to the above (8), the supply amount of slurry supplied to the gas-liquid contact device is controlled such that the liquid level of the liquid reservoir is within a specified range. A gas evening bin power generator comprising liquid level control means.

(16) In the gas turbine power generator according to (8), a liquid reservoir is provided at the bottom of the humidifier, and the liquid in the liquid reservoir is mixed with the gas turbine exhaust gas before being introduced into the water recovery / desulfurizer. A gas turbine power generator characterized by increasing the temperature by heat exchange.

In the present invention, hydrogen sulfide and sulfide power contained in the gasification gas of carbon-based fuel are combusted by a gas turbine combustor into sulfur dioxide, and this diacid A desulfurization device for removing sulfur fluoride was installed downstream of the gas turbine. By adding a water recovery function to this desulfurization unit, the number of components in the power plant has been reduced. As a means to achieve water recovery and desulfurization at the same time, we used condensation heat exchange in which cooling water was brought into direct contact with gas exhaust gas from bottles. The water recovered from the gas bottle was used for this cooling water. In addition, a desulfurizing agent such as limestone (C a C〇3) was added to make the cooling water have a desulfurization function. When the cooling water containing desulfurizing agent is contacted with the gas turbine exhaust gas, at the same time the moisture which is present as a gas in the exhaust gas is condensed, sulfur dioxide in the exhaust gas (S_〇 ₂₎ and the desulfurizing agent reacts gypsum (C a SC). The gypsum is removed from the liquid and the water is recovered. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a schematic configuration diagram of a power plant according to one embodiment of the present invention. FIG. 2 is a schematic configuration diagram showing an example of a water recovery / desulfurizer in the power generator of the present invention.

FIG. 3 is a schematic configuration diagram showing another example of the water recovery / desulfurizer in the power generator of the present invention.

FIG. 4 is a schematic configuration diagram showing another example of the water recovery / desulfurizer in the power generator of the present invention.

FIG. 5 is a schematic configuration diagram showing an example of an air humidifier in the power generator of the present invention.

FIG. 6 is a schematic configuration diagram showing another example of the air humidifier in the power generator of the present invention.

FIG. 7 is a schematic configuration diagram showing another example of the air humidifier in the power generator of the present invention. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. However, the present invention is not limited to the embodiments described below.

(Example 1)

FIG. 1 shows an embodiment of a coal gasification power generation plant targeted by the present invention. The outline of the plant configuration will be described with reference to FIG. In a coal gasification power generation plant, a carbon-based fuel 1 such as coal or heavy oil and an oxidizing agent 2 such as oxygen or oxygen-enriched air are supplied to a gasifier 110 to react. The gas generated by the gasifier 11 is a combustible gas mainly composed of carbon monoxide and hydrogen, and contains sulfur and ammonia such as hydrogen sulfide and carbonyl sulfide as impurities. It also contains ash and unburned coal that could not be removed by the gasifier. If the temperature of the gas is high, the ash contained in the generated gas will adhere to downstream equipment and cause troubles.Therefore, after lowering the gas temperature with the gas cooler 120, remove the dust. The ash and unburned coal are separated and recovered by the device 210. In addition, since the ammonia contained in the generated gas causes nitrogen oxides to be generated in the gas turbine combustor, the ammonia is removed by the ammonia removing device 220 before introducing the generated gas into the combustor. Remove. The coal gasified gas from which the ash and ammonia have been removed in this way is introduced into the gas turbine combustor 310. In a gas turbine combustor, coal gasified gas is burned by humidified compressed air 24. Hydrogen sulfide and carbon sulfide contained in coal gasification gas are converted into sulfur dioxide in the combustor. The gas generated by the combustor becomes the working medium gas 15 of the gas turbine, and the gas turbine 3330 is driven to obtain electric power by the generator 340. The gas turbine exhaust gas 16 exhausted from the gas turbine 330 contains sulfur dioxide and moisture. Water recovery ・ Separate and recover in the desulfurizer 430 respectively. Prior to water recovery and desulfurization, heat exchange between the gas turbine exhaust gas 16 and the humidified air 23 is performed in the heat exchanger 420. In the heat exchanger 420, the temperature of the gas turbine exhaust gas is lowered, and the gas turbine exhaust gas 17 whose temperature has dropped is collected in water. The effect of absorbing sulfur dioxide is higher than that of introducing it into 430. The water recovered by the water recovery-desulfurizer 4 3 0, gypsum and dissolved C a S_〇 ₄ is contained as a suspension produced by chemical reaction between sulfur dioxide and the desulfurizing agent. Gypsum is a solid and can be easily removed from the water recovery / desulfurizer, but Ca SC is not easily removed because it is dissolved in the recovered water.

In a state where C a S 0 4 was dissolved, resulting in the humidified air supplied to the gas turbine combustor, a C a S 0 ₄ is out analysis failure in the temperature of the water rises due to the recovered water. Therefore, to remove the CaS_〇 ₄ in suspension removing device 4 5 0. C a S 0 ₄ recovered water 3 2 removing the is supplied to the humidifier 4 1 0, Ru is utilized to humidify the compressor 3 2 compressed air 2 2 obtained at 0.

Next, the outline of each part will be described. First, the gasifier 110 will be described. For example, when coal is used as a raw material, fuel is supplied to the gasifier 110 by dry feed, which transports fine coal with gas such as pressurized nitrogen, and wet feed, which supplies fine coal as a slurry suspended in water. Etc. can be used. If oxygen is used as the oxidizing agent or if nitrogen is used to transport coal, these gases can be produced from air. A commonly used method is to separate air from nitrogen and oxygen using a force membrane, which is a method of cooling air and performing fractionation utilizing the difference in boiling point between nitrogen and oxygen. The structure of the gasifier does not include a method using a fluidized bed or a method using a spouted bed. This is also available. In any type of gasifier, the carbon-based fuel is gasified by an oxidizing agent to produce a flammable gas containing carbon monoxide and hydrogen as main components. In a spouted bed gasifier, the temperature inside the gasifier can be maintained at a high temperature, so that the ash contained in the carbon-based fuel can be melted and removed from the gasifier.

Next, the gas cooling device 120 will be described. It is necessary to cool the gas produced by the coal gas furnace because the ash that could not be removed by the gasifier and the carbon-based fuel that did not become gas remain in the produced gas. This is because the device adheres to the dust removing device 210 here and causes an obstacle. Usually, by lowering the temperature of the generated gas to about 40 Ot :, it is possible to avoid this ash adhesion failure. Examples of the cooling method include a method of flowing cooling water through a heat transfer tube and recovering the heat of the generated gas as steam, and a method of spraying the cooling water directly onto the generated gas and removing the heat of vaporization from the generated gas. Applicable. At this time, water recovered from gas turbine exhaust gas can be used as the cooling water. In the method in which cooling water is directly sprayed on the generated gas, the cooling water can be used as a working medium gas of a gas turbine.

Next, the dust removing device 210 will be described. The dedusting device collects sodium, potassium, and vanadium-containing ash in the carbon-based fuel that could not be discharged as slag in the coal gasifier, and non-gasified carbon-based fuel. As the dust removing device, for example, a device combining a cyclone and a dust filter is preferable. In addition to this, a known device such as a system using a drab double bed can be used.

Next, the ammonia removing device 220 will be described. It is necessary to remove the ammonia contained in the gas generated by the gasification furnace. This is because when combusted in a turbine combustor, this ammonia becomes nitrogen oxides, an air pollutant. As the ammonia removing device, a method using an adsorbent, a method using chemical absorption, and the like can be used. Next, the water recovery / desulfurizer 430 will be described. As this water recovery / desulfurizer, it is preferable to use a spray tower of a type in which a water slurry containing a desulfurizing agent is sprayed and brought into contact with gas turbine exhaust gas. By directly spraying water onto the exhaust gas to lower the temperature of the exhaust gas, water contained in the exhaust gas in a gaseous state can be condensed and recovered as a liquid.In addition, a desulfurizing agent such as limestone (main component calcium carbonate) added, by spraying in the slurry, it is possible to sulfur dioxide contained in the exhaust gases (S 0 ₂₎ separated as gypsum and recovered. Gypsum 43 is extracted out of the system. The gas turbine exhaust gas 18, which is made harmless by separating sulfur and water, is discharged into the atmosphere.

Next, the humidifier 410 will be described. The humidifier is a device for humidifying the compressed air 22 obtained by compressing the air 21 with the compressor 320. As the humidifier 410, it is preferable to use a spray tower that sprays water on compressed air. As the water to be sprayed, recovered water collected by a water recovery / desulfurizer 430 can be used. The humidifier 4 1 0 shown in FIG. 1, in order to prevent the occurrence is C a S 0 ₄ precipitation to a nozzle for spraying the recovered water, supplying makeup water 3 1 not containing C a S 0 4 I can do it. By adding make-up water to lower the concentration of CaS〇4 dissolved in the recovered water, the effect of suppressing the precipitation of CaS04 due to an increase in water temperature is obtained. In addition, the water collected at the bottom of the humidifier is configured so that it can be reused as humidified air as recycled water 33. The humidified air 23 takes heat from the gas turbine exhaust gas with the heat exchanger 420 and then introduces it into the gas turbine combustor. Is done. The humidified air contains moisture and has the heat necessary to evaporate this moisture, so it is possible to recover the heat of the exhaust gas from the gas bin.

Next, the process of separating and removing sulfur dioxide contained in gas turbine exhaust gas using a desulfurizing agent will be described.

Sulfur dioxide in the exhaust gas is physically absorbed into the liquid by contact with the desulfurizing agent, and then reacts with water to form sulfurous acid. Since the desulfurizing agent has an effect of absorbing sulfur dioxide, the desulfurizing agent can also be referred to as a sulfur dioxide absorbent.

S 02 (gas) S〇2 (absorbed in liquid) · '· (1)

S〇2 (in liquid) + Η ₂₀ << ₂ S〇3… (2) Sulfurous acid in liquid dissociates as follows. .

_{^{H 2 SO a H + + HS}} Oa - ... (3) On the other hand, in the case of using the calcium carbonate contained in the limestone in the desulfurizing agent (CaC_〇 _3), C a C0 ₃ is first dissolved in water.

Ca COs <^> Ca COs (in liquid) · '· (4) The dissolved calcium carbonate reacts with sulfurous acid in the liquid to form calcium hyposulfite.

^{C a COs + H + + HS} Os - C a (HS 0 3) 2 ... (5) Calcium hyposulfite reacts with the calcium carbonate in the liquid to generate a sulfurous calcium © beam.

2CaC〇3 + C a (HS〇 ₃ ) 2 → 2 C a SO 3 + C a (HCOa) 2

In (6) These reactions, resulting HC0 ₃ -, HS_〇 ₃ - since work as a pH buffer, p H is relatively stable even if the calcium carbonate is supplied. Here, in a solution in a sulfuric acid atmosphere, unreacted calcium carbonate and sulfuric acid react to form gypsum as follows.

C a C 03 + H ₂ S 04 + H ₂ 〇 → C a S 0 ₄ 2 H ₂ 0 + C O2

… (7) Calcium sulfite reacts with sulfuric acid to produce gypsum as follows.

2 C a SO 3 + H2 S〇4 + 2 H2 0 → C a S θ 4 2 H2 O + C a (HS 0 ₃ ) C 2-(8) Here, when air is supplied to the liquid, oxygen Dissolves in the solution and reacts with calcium hyposulfite to form gypsum as shown in the following formula.

_{2 C a (HS 0 3)} 2 + O2 + 4H 2 0 → 2 C a S 0 4 · 2 H 2 O

... (9) in order to improve the desulfurization efficiency, (1) and to promote the reaction to absorb S 0 ₂ in the solution in the exhaust gas to (3), oxidation of (8) - (9) It is desirable to promote. JP 6 1 - 2 9 3 5 2 8 No. relation S_〇 ₂ concentration pH and in the gas phase of the liquid is shown, also the relationship between pH and C a S Oa oxidation rate of the liquid shown Have been. In the present invention, the relationship described in JP-A-61-293528 can be applied.

(3) it is desirable to increase the absorption rate of S 0 ₂ to promote the reaction p H is 3.8 or more, also, pH in order to increase the rate of oxidation of C a S_〇 ₃ 5.0 or less It is desirable that Therefore, the pH value is preferably in the range of 3.8 to 5.0.

(Example 2)

In this embodiment, a water recovery / desulfurizer will be described with reference to FIG. Moth The turbine exhaust gas is supplied to the spray tower 432 after the temperature is reduced by the heat exchanger 431. In this spray tower, the water slurry 42 containing the desulfurizing agent 41 supplied from the gas-liquid contact device 501 comes into contact with the gas turbine exhaust gas. The gas-liquid contact device 501 is a device for spraying a water slurry as fine droplets. For example, a plurality of spray nozzles are provided on a surface perpendicular to the flow direction of exhaust gas. Due to the gas-liquid contact in the spray tower, the temperature of the exhaust gas decreases, and the moisture in the exhaust gas existing as a gas condenses to a liquid. Further, S_〇 ₂ in the exhaust gas is absorbed into a slurry containing a desulfurizing agent. The exhaust gas is supplied to the heat exchanger 431 after removing the mist by the mist collector 4 3 3, and after being heated, it is released to the atmosphere. Raising the temperature of the exhaust gas can prevent white smoke.

The slurry sprayed from the gas-liquid contact device accumulates at the bottom of the spray tower to form a liquid pool 502, where the sulfur content in the exhaust gas becomes gypsum. This slurry-liquid reservoir comprises a desulfurization agent unreacted with S_〇 ₂ and reused. For this reuse, the slurry 35 extracted from the liquid pool is supplied to the heat exchanger 4 35 by the pump 51. Cooling water 34 is supplied to the heat exchanger 435 by a pump 54, and indirectly contacts the slurry 35 to lower the temperature of the slurry. Reducing the temperature of the slurry is effective in increasing the absorption of sulfur dioxide. The temperature-reduced slurry is supplied to the gas-liquid contact device 501, and is brought into direct contact with the exhaust gas again.

A part 36 of the liquid in the liquid pool is supplied to a gypsum separator 43 to separate gypsum 43 as a solid content. The water from which the solid content has been separated is stored in the recovered water tank 438. The recovered water in the recovered water tank is pressurized by the pump 53, and part of the recovered water is supplied to equipment that requires water, such as a humidifier, and reused. The remaining part of the recovered water is supplied to the slurry adjustment tank 4 3 7 It is mixed with the desulfurizing agent 41 supplied from the desulfurizing agent hopper 436 to form a water slurry 42 containing the desulfurizing agent. This slurry is supplied to the gas-liquid contact device 501 by the pump 52.

According to the second embodiment, the water recovered from the gas turbine exhaust gas can be used in the HAT cycle, and the retained heat of the exhaust gas exhausted from the gas turbine can also be recovered and used in the HAT cycle. You.

(Example 3)

In order to promote the desulfurization reaction efficiently, it is desirable to control the pH of the water slurry containing the desulfurizing agent within the range of 3.8 to 5.0. This embodiment shows one embodiment in which the pH is adjusted by a spray tower.

FIG. 3 shows the configuration of the present embodiment. The gas turbine exhaust gas 17 is basically supplied above the liquid reservoir 502 through an exhaust gas supply pipe 503. In the present embodiment, a part of the exhaust gas supply pipe 503 is branched and the gas turbine exhaust gas is also supplied from the exhaust gas branch pipe 504 into the liquid reservoir 502. An exhaust gas flow control valve 61 is installed in the exhaust gas branch pipe 504. The exhaust gas flow control valve 61 is operated so that the pH of the liquid pool 502 is within a given range. Specifically, the pH of the liquid pool 502 is detected by the pH meter 91, and the controller 71 generates a control signal for the exhaust gas flow control valve so that this value falls within the specified pH range 81. The exhaust gas flow control valve 61 is controlled.

Incidentally, the gas turbine exhaust gas, the oxidation of C a S_〇 ₃ in the liquid reservoir in order to promote, it is necessary to gas turbine exhaust gas supplied into the liquid reservoir is dispersed in efficiently puddle . As a method for this, for example, there is a method in which a stirring blade 505 is provided and gas turbine exhaust gas is supplied to the stirring blade. If the level of the liquid in the sump is lower than the position of the piping that supplies the slurry 35 to the pump 51, the load on the pump will suddenly disappear and the number of revolutions will suddenly increase, and from the gas turbine exhaust gas inlet. If it is too high, the exhaust gas will not flow easily. This liquid level control is performed by controlling the supply amount of the water slurry 42 containing the desulfurizing agent to the gas-liquid contact device 501 or by supplying the slurry to the liquid pool 502 so as to supply the slurry. Can be realized by controlling Specifically, the water level in the sump is detected by the water level gauge 92, and the controller 72 generates a control signal for the slurry flow rate adjustment valve so that the value falls within the specified range 82.

6 2 and 6 3 are controlled.

(Example 4)

This embodiment is an auxiliary means used when the pH control by the method of Embodiment 3 is insufficient. In the present embodiment, as shown in FIG. 4, in addition to the configuration shown in the third embodiment, a line for supplying the pH adjusting agent 44 to the liquid reservoir 502 is provided. As the pH adjuster, for example, sulfuric acid can be used. The controller adjusts the pH regulator flow control valve 6 4 so that the supply amount of the pH regulator is within the specified range 81 given the measured value obtained by the pH meter 91.

7 It is realized by controlling with 3.

(Example 5)

In the present embodiment, an example of the configuration of a humidifier 410 that humidifies the compressed air 22 obtained by the compressor 320 will be described.

As shown in FIG. 5, the compressed air 22 is supplied into the liquid reservoir 413 below the humidifier 410 or to the upper portion of the liquid reservoir. The compressed air 22 comes into contact with mist-like water droplets supplied from the gas-liquid contact device 412 installed in the humidifier 410 to become humidified air 23. The gas-liquid contact device 4 1 2 This is a device for spraying as droplets. For example, a plurality of spray nozzles are provided on a surface perpendicular to the flow direction of the compressed air 22. A mist collector 4 1 1 is installed at the outlet of the humidifier so that liquid moisture is not supplied downstream of the humidifier.

The gas-liquid contacting device 4 1 2 is supplied with makeup water 31 containing no impurities and recycled water 33 obtained by removing the suspended solids from the water in the pool. Suspended matter is removed by passing the water in the pool through a suspended matter separator 440.The water from which suspended matter has been removed is temporarily stored in a tank 441, and then sent out by a pump 555. I do. Here, as shown in Fig. 6, supply of make-up water 31 and recycle water 33 is performed by preparing two systems of gas-liquid contactors, dedicated to make-up water and dedicated to recycle water, respectively. It is desirable to install the contact device above the gas-liquid contact device dedicated to recycled water. Since this may C a S_〇 ₄ that Dissolved in collecting water is precipitated and raising the temperature of the water, and configured to clean the gas-liquid contact device for spraying the recovered water in makeup water, C a S_〇 is because ₄ can be prevented from immediately wash-off in growth even if the precipitation. In addition, the configuration in which the gas-liquid contact device that sprays only make-up water is closer to the humidifier outlet side than the gas-liquid contact device that sprays only recovered water is such that droplets containing impurities are less likely to be sent downstream. However, it is also suitable from the viewpoint of protecting equipment downstream of the humidifier.

In the conventional HAT cycle using LNG as a raw material, the recovered water is heated outside of the humidification tower using gas turbine exhaust gas using an indirect heat exchanger.In this method, the recovered water is dissolved in the recovered water pipes. The precipitated Ca S いた 4 could precipitate and clog. As shown in Fig. 7, a pipe 508 is installed in the humidifier's liquid reservoir 4 13 to allow a part or all of the exhaust gas 17 from the gas bin to flow, and the energy of the exhaust gas is stored indirectly. Give to the water The temperature was raised to partially evaporate. Since the replenishment water is always supplied to the liquid reservoir, it is a Ca S C4 unsaturated solution. Not wish to precipitation of C a S_〇 _4, also, since the water vaporized gas does not include the C a S 0 _4, where if this is supplied to the downstream together with the air, the gas turbine combustor, gas evening it is possible to prevent the C a S_〇 ₄ is deposited in such as single bottles. Industrial applicability

In a power plant that gasifies carbon-based fuel and uses it for the HAT cycle, hydrogen sulfide and carbon sulfide, which are sulfur compounds in the gasified gas, are burned in a gas turbine combustor to form sulfur dioxide, which is then downstream of the gas turbine. The following effects can be obtained by removing this sulfur dioxide by the water recovery device. First, as has conventionally been done in coal gasification power generation equipment, there are equipment that converts sulfide power to hydrogen sulfide, equipment that absorbs hydrogen sulfide, incinerators that burn the absorbed hydrogen sulfide, and incinerators. A desulfurizer for removing the generated sulfur dioxide can be dispensed with. Also, since it is not necessary to lower the temperature of the gasified gas to normal temperature for desulfurization, heat loss can be reduced, and high efficiency of the HAT cycle can be achieved. Therefore, there is great potential for industrial use.

Claims

The scope of the claims

1. Gasification gas, air and water vapor generated by gasification of carbon-based fuel are introduced into a combustor to burn the gasification gas, and the resulting gas is used as a working medium to drive a gas bin. In a gas turbine power generation method that generates power by

Introducing the gasified gas into the combustor in a state of containing the sulfur content, contacting the exhaust gas discharged from the gas turbine with water containing a desulfurizing agent, and separating and recovering the sulfur content from the exhaust gas. A gas turbine power generation method comprising:

2. The method according to claim 1, wherein the gasification gas is introduced into the combustor in a state containing hydrogen sulfide and carbonyl sulfide, and the gas is mixed with the hydrogen sulfide in the combustor. The carbonyl sulfide is converted into sulfur dioxide and then supplied to the gas bin, and the exhaust gas exhausted from the gas bin is brought into contact with water containing a sulfur dioxide absorbent to remove sulfur dioxide from the exhaust gas. A gas turbine power generation method characterized by separating and recovering gas.

3. Combustible gas, air and water vapor are introduced into the combustor to burn the combustible gas, and the obtained gas is used as a working medium to drive the gas turbine to generate power, thereby cooling the exhaust gas from the gas turbine. Gas turbine power generation method that separates and collects part of the moisture

Using a gaseous gas of a carbon-based fuel as a combustible gas to be supplied to the combustor, introducing the gasified gas into the combustor in a state of containing a sulfur content, and exhausting the exhaust gas from the gas bin. A gas turbine power generation method, comprising contacting cooling water containing a desulfurizing agent to separate and recover sulfur and a part of water from the exhaust gas.

4. A combustor for combustible gas in the presence of air and water vapor, and the combustor Gas turbine having a gas turbine that generates power using the gas obtained in the above as a working medium, and a water recovery unit that cools exhaust gas discharged from the gas turbine and separates and recovers a part of water. At

5. The gas bin generator according to claim 4, wherein the water collecting and desulfurizing unit is provided with a liquid reservoir at a bottom portion so that the liquid in the liquid reservoir is recycled. A gas turbine power generator comprising a pH control means for maintaining a pH of a pool liquid in a range of 3.8 to 5.0.

6. The gas turbine power generator according to claim 5, wherein an inlet of the gas turbine exhaust gas to the water recovery / desulfurizer is provided between a liquid phase in the liquid reservoir and a gas phase in the upper part of the liquid reservoir. A gas turbine power generator, provided at two locations, and provided with a controller for controlling the flow rate of the exhaust gas introduced into the liquid phase based on the pH of the liquid in the liquid pool.

7. The gas turbine power generator according to claim 6, further comprising a pH adjusting agent supply means for supplying a pH adjusting agent to the reservoir.

8. A combustor, a gas turbine that generates power using the gas obtained in the combustor as a working medium, an air compressor that compresses air using the power of the gas turbine, and the air compressor A humidifier for adding moisture to the compressed air obtained in step 1 to humidify the air, and heat-exchanging the compressed air humidified by the humidifier with the exhaust gas exhausted from the gas bin to raise the temperature. A heat exchanger, In the gas turbine power generator, the humidified air heated by the heat exchanger is introduced into the combustor.

A fuel supply system for introducing a combustible gas containing sulfur into the combustor; and a gas bin exhaust gas cooled by the heat exchanger is brought into contact with water mixed with a desulfurizing agent, and from the exhaust gas. A gas turbine power generator comprising a water recovery / desulfurizer for separating and recovering sulfur and part of water.

9. The suspension removing apparatus according to claim 8, further comprising a suspended matter removing apparatus for removing suspended matter in the water by introducing the recovered water separated and recovered by the water collecting / desulfurizer. A gas evening bin power generator, wherein the recovered water from which suspended matter has been removed is introduced into the humidifier.

10. The humidifier according to claim 9, wherein the humidifier has a compressed air introduction part at a lower part, and a spray nozzle for collected water at an upper part for spraying collected water from which suspended matter has been removed by the suspended matter removing device. And a make-up water spray nozzle for spraying make-up water. The make-up water spray nozzle is provided above the recovered water spray nozzle, and the make-up water spray nozzle is used to make up the make-up water sprayed from the make-up water spray nozzle. A gas turbine power generator wherein the spray nozzle for recovered water is washed.

11. A combustor, a gas turbine that generates power using the gas obtained in the combustor as a working medium, an air compressor that compresses air using the power of the gas bin, and an air compressor A humidifier that adds moisture to the compressed air obtained by the humidifier to humidify the air, and heats the compressed air humidified by the humidifier by exchanging heat with the exhaust gas exhausted from the gas evening bin. A heat exchanger for heating the gas, wherein the humidified air heated by the heat exchanger is introduced into the combustor.

A fuel supply system for introducing a gasified gas of a carbon-based fuel into the combustor, A gasification furnace for carbon-based fuel in the fuel supply system, a gas cooling device for cooling a gas generated from the gasification furnace so that ash mixed in the gas does not adhere, and an ash mixed in the gas generated A dust removing device for separating and removing carbonized fuel that has not been gasified, and an ammonia removing device for removing ammonia contained in the produced gas,

A water recovery / desulfurization unit for bringing the gas exhaust gas exhaust gas cooled by the heat exchanger into contact with water mixed with a desulfurizing agent to separate and recover sulfur and a part of moisture from the exhaust gas; A gas turbine power generator characterized by the following.

12. The gas turbine bin power generator according to claim 8, wherein after the heat exchange between the gas turbine bin exhaust gas and the humidified air, the gas turbine exhaust gas and the water recovery / desulfurizer are used. A heat exchanger for heat exchange between sulfur and a gas from which a part of water has been removed to raise the temperature of the gas processed by the water recovery / desulfurizer. .

13. The gas turbine power generator according to claim 8, further comprising: a gas-liquid contact device for bringing gas turbine exhaust gas into contact with a water slurry containing a desulfurizing agent at an upper portion of the water recovery / desulfurizer; A gas turbine power generator, wherein a liquid reservoir is provided, and a part of the liquid in the liquid reservoir is extracted and circulated to the gas-liquid contact device.

14. The gas turbine power plant as set forth in claim 13 further comprising a suspended solid removal device for separating and removing suspended solids contained in the recovered water separated and recovered by the water recovery and desulfurizer. A part of the recovered water treated by the suspension remover is introduced into the humidifier, and a desulfurizing agent is added to the remaining recovered water and circulated through the gas-liquid contact device. A gas evening bin power generation device characterized by being configured as follows.

15. The gas turbine power generator according to claim 8, wherein A gas turbine power generator, comprising: liquid level control means for controlling a supply amount of a slurry supplied to the gas-liquid contact device so that a liquid level of a liquid pool is within a specified range.

16. The gas turbine power generator according to claim 8, wherein a liquid reservoir is provided at a bottom portion of the humidifier, and the liquid in the liquid reservoir is introduced into the water recovery / desulfurizer. A gas turbine power generator characterized in that the temperature is raised by exchanging heat with exhaust gas.