JP2000161081A - Intake device for thermal power plant - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an intake device for a thermal power plant for increasing output by cleaning and cooling the sucked air to heighten its density in summer and when the ambient temperature is high. SOLUTION: This intake device for a thermal power plant is provided with a sprinkling part 22 accommodated in an intake duct 21 connected to an intake port 20 of an air compressor 16, and a drain recovering and regenerating part 25 connected to the sprinkling part 22 and recovering and regenerating the drain of an impurity eliminating solution sucking impurities contained in sucked air, so as to supply it again as the impurity eliminating solution to the sprinkling part 22.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intake device for a thermal power plant for effectively removing impurities such as dust contained in air taken in.

[0002]

2. Description of the Related Art In recent thermal power generation plants, a combined cycle power generation plant in which the advantages of both steam turbine plants or gas turbine plants are skillfully combined is becoming the mainstream instead of a single steam turbine plant or a single gas turbine plant.

This combined cycle power plant combines different cycles operating in a high temperature range and a low temperature range, and uses a Brayton cycle of a gas turbine plant using heat of combustion of fuel as a heat source in a high temperature side cycle. The low-temperature cycle uses a Rankine cycle that uses the residual heat of the combustion gas exhaust, which is the working medium of the high-temperature cycle, as a heat source to improve overall thermal efficiency. In other words, this combined cycle power plant combines the two cycles of gas turbine power generation and steam power generation to provide an advantage that the maximum use temperature of the gas turbine plant is high and an advantage that the minimum cycle use temperature of the steam turbine plant is low. It is something that utilized.

[0004] Combined cycle power plants include:
There are an exhaust gas reburning type and an exhaust heat recovery type, but the exhaust heat recovery type is more frequently operated due to ease of handling operation, and the configuration shown in FIG. 6 is shown.

[0005] The combined cycle power plant is constructed by combining a gas turbine 1 with a steam turbine plant 2 and an exhaust heat recovery boiler 3.

The gas turbine plant 1 includes an air compressor 4, a gas turbine combustor 5, and a gas turbine 6. The air (atmosphere) sucked by the air compressor 4 is compressed into high-pressure air, and the high-pressure air is used as fuel. At the same time, the gas is supplied to a gas turbine combustor 5, where combustion gas is generated, and the combustion gas is expanded by a gas turbine 6. At that time, a rotational torque for driving the steam turbine plant 2 is generated.

The exhaust heat recovery boiler 3 is installed separately from the gas turbine plant 1 and includes a plurality of heat exchangers 7 therein.
Specifically, a superheater, an evaporator, a economizer, etc. are accommodated, and steam is generated using the gas turbine exhaust gas that has completed expansion work in the gas turbine 6 as a heat source, and the steam is supplied to the steam turbine plant 2. ing.

The steam turbine plant 2 includes a generator 9 and a steam turbine 10 which are directly connected to a turbine shaft 8 of the gas turbine plant 1 and a separate condenser 1.
1, a heat exchanger 7 of a waste heat recovery boiler 3 having a pump 12
The steam supplied from the steam turbine is expanded by the steam turbine 10 to drive the generator 9, and the turbine exhaust having completed the expansion work in the steam turbine 10 is condensed by the condenser 11 to be condensed and supplied. The heat is returned to the heat exchanger 7 of the exhaust heat recovery boiler 3 via the water / water supply pump 12.

On the other hand, the air compressor 4 of the gas turbine plant 1 is provided with a cooler 14 at its intake port 13 to cool air having a high specific temperature and a low specific weight in summer to increase the flow rate weight. In the summer, high output is maintained.

Meanwhile, the combined cycle power plant consumes a large amount of liquefied natural gas (LNG), which generates less environmental pollutants, as a fuel used for the gas turbine combustor 6 of the gas turbine plant 1. Since a large amount of cooling water is used for the condenser 11 of the plant 2, the cooling water is required for seawater. For this reason, combined cycle power plants are often installed along the coast in consideration of transporting a large amount of fuel and securing a large amount of cooling water.

However, when installed along the coast, the air sucked by the air compressor 4 of the gas turbine plant 1 contains many impurities in addition to the salt content, and these impurities cause equipment damage and performance deterioration. So, the air compressor 4
As shown in FIG. 7, an air purifier 15 is provided on the inlet side of the cooler 14 to remove impurities contained in the air.

[0012]

In the conventional combined cycle power plant shown in FIG. 7, an air purifying device 1 is connected to an inlet 13 of an air compressor 4 of a gas turbine plant 1.
5 is provided to remove impurities such as salts contained in the air, but there are still some problems.

As a filter material for removing salt, for example, Japanese Patent Application Laid-Open No. HEI 5-106644 discloses the use of a filter made of ion exchange fibers. However, the ion-exchange fiber filter has a large pressure loss before and after the filter, resulting in clogging as a result of long-term use, which makes it difficult to secure an air flow rate as designed, which is inconvenient.

As means for relatively reducing the pressure loss, for example, JP-A-7-208206 and JP-A-8-208206
Japanese Patent Application Publication No. 165933 discloses an application of an electric dust collector. However, in the case of an electric precipitator, it is necessary to install a large number at the intake port of the air compressor, which increases the equipment cost, and also requires that electrical checks and repair inspections be performed at all times. However, there is a problem that the labor of the worker is forced.

As means for simplifying the equipment, for example, Japanese Patent Application Laid-Open No. H6-159093 discloses a method in which the gravity of an impurity is used to adsorb a water droplet film,
Japanese Patent Publication No. 10892 discloses a method of spraying ice water in which air cleaning and increasing the density are used in combination.

However, in the former, it is difficult to effectively treat a large amount of impurities, and it is also difficult to treat organic impurities. Further, the latter is extremely unstable from the viewpoint of uniform distribution and recovery of ice water, and is far from realizing.

As described above, the air purifying device 15 already proposed has several problems, and is currently being sought for application to the cleaning of the intake air of an air compressor.

The present invention has been made in view of such circumstances, and purifies the sucked air.
It is an object of the present invention to provide an intake device for a thermal power plant that cools air taken in when the temperature is high in summer and increases the density thereof to further increase the output.

[0019]

According to a first aspect of the present invention, there is provided an air intake system for a thermal power plant, comprising: an air intake duct connected to an air inlet of an air compressor; A sprinkler for ejecting the impurity-removing solution into the air containing the sucked impurities, and a drain of the impurity-removing solution that is connected to the sprinkler and adsorbs the impurities contained in the sucked air. And a drain recovery / regeneration unit for supplying the sprinkling unit with an impurity removing solution.

According to a second aspect of the present invention, there is provided an intake device for a thermal power plant, wherein the distal end of an intake duct connected to an intake port of an air compressor is bent. Folded air intake duct, a water sprinkling recovery tank facing the bent air intake duct, and meandering the air containing the sucked impurities to guide the air to the opening of the air intake duct, and accommodated in the air intake duct. A water spraying section for bringing the impurity-removing solution into counter-flow contact with the meandering air and a drain of the impurity-removing solution having adsorbed the impurities collected in the water-spraying recovery tank, and then the drain is regenerated and regenerated And a drain recovery / regeneration unit for supplying the sprinkling unit with an impurity removing solution.

According to a third aspect of the present invention, there is provided an air intake unit for a thermal power plant according to the present invention, wherein the water sprinkling unit is housed in one of an intake duct and a bent intake duct. Is provided with a cooler and an eliminator in order along the flow of the sucked air.

According to a fourth aspect of the present invention, there is provided an air intake system for a thermal power plant, wherein an eliminator is formed in a net shape.

According to a fifth aspect of the present invention, there is provided an air intake system for a thermal power plant according to the present invention, wherein a drain generated when a cooler cools sucked air is provided. Is supplied to the drain tank of the drain recovery / recycling processing section.

According to a sixth aspect of the present invention, there is provided an air intake system for a thermal power plant, comprising the steps of: A drain tank that generates the removal solution, a filtration filter that supplies the impurity removal solution from the drain tank to the sprinkler, and a drain that adsorbs impurities contained in the air sucked into the impurity removal solution from the sprinkler, The system includes a drain regeneration device for separating the drain into sludge and clean water and separating the drain, and a drain collection / regeneration treatment reflux system for returning the clean water from the drain regeneration device to the drain tank.

According to a seventh aspect of the present invention, there is provided an air intake system for a thermal power plant according to the present invention. A removing device is provided, which removes ions contained in the impurity removing solution supplied to the water sprinkling section from the filtration filter and charges the ions during the flow, and the water sprinkling section is made of a low electric conductive material.

In order to achieve the above object, the intake device for a thermal power plant according to the present invention is characterized in that the low electric conductive material is Teflon. is there.

Further, in order to achieve the above object, the air intake device for a thermal power plant according to the present invention has a water sprinkling portion formed as a box portion, and the water is sprayed on a bottom plate of the box portion. An exit was drilled.

Further, in order to achieve the above object, in the intake device for a thermal power plant according to the present invention, the injection port has a hole diameter of 1.0 to 1.5 mm.
Is set in the range.

Further, in order to achieve the above object, in the air intake system for a thermal power plant according to the present invention, the outlet is formed in a solid cone shape and the solid cone shape is provided. Is set in the range of 5 to 9 mm.

[0030]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of an intake device for a thermal power plant according to the present invention.

FIG. 1 is a schematic system diagram showing a first embodiment of an intake device for a thermal power plant according to the present invention. The thermal power plant uses an open-sile gas turbine power plant as an example.

The open cycle gas turbine power plant includes an air compressor 16, a gas turbine combustor 17, a gas turbine 18, and a generator 19, and compresses the air (atmosphere) sucked by the air compressor 16 to a high pressure. Supplying the high-pressure air to the gas turbine combustor 17 together with the fuel,
Here, the combustion gas is generated, and the combustion gas is expanded by the gas turbine 18, and the generator 19 is driven by the rotational torque generated at that time.

The air compressor 16 is provided with a cylindrical intake duct 21 at an intake port 20, and accommodates a water sprinkling section 22, a cooler 23, and an eliminator 24 in this intake duct 21 in order along the flow of air. A drain recovery / regeneration unit 25 is provided outside the intake duct 21.

The cooler 23 is installed outside the intake duct 21 and supplies a cooling medium supply device 26 for supplying a refrigerant for cooling the air guided to the intake port 20, and a cooling medium supply device 26 for cooling the air. A drain collecting unit 27 that collects the drain D to be collected and supplies the collected drain D to the drain recovery / regeneration processing unit 25. The cooler 23 is used only when the temperature in summer is high to increase the density of air.

On the other hand, the drain recovery / regeneration processing unit 25 includes a drain tank 28, a pump 29, and a filtration filter 30 and is connected to the water sprinkling unit 22. There is provided a drain recovery / recirculation system 34 for returning to the drain tank 28 via a pump 32 and a drain regeneration device 33. In addition, the drain recovery / regeneration processing unit 25 is provided with a makeup water supply unit 35 that supplies city water or industrial water to the drain tank 28, and when the drain D generated from the cooler 23 is zero as in winter,
City water or the like is supplied from the replenishing water supply unit 35 to the drain tank 28 for replenishment during startup operation. In addition, a solvent as an impurity removing substance such as sodium chloride and carbon potassium is added to the drain tank 28 in addition to city water so that impurities such as hydrogen sulfide contained in the air passing through the water spraying section 22 are removed. Has become.

The eliminator 24 is formed in a fine mesh of mesh so that the drain D contained in the air does not flow into the intake port 20 of the air compressor 16.

Next, the operation will be described.

During a low temperature start-up operation, such as in winter, a solvent such as sodium chloride is added to the supply water from the make-up water supply unit 35 to the drain tank 28 of the drain recovery and regeneration processing unit 25 to remove impurities. A solution is formed.

The impurity removing solution is supplied to the drain tank 28
From the sprinkling unit 22 via a pump 29 and a filtration filter 30
And adsorbs impurities such as salt and sulfur contained in the air flowing through the intake duct 2, and is collected in the water spray recovery unit 31. Sprinkle collection unit 31
The impurity-removed solution collected in the tank is supplied to a drain regeneration unit 33 via a pump 32, where it is again separated into sludge and clean water, the sludge is blown out of the system, and the clean water is collected and recycled. Treatment reflux system 34
And is again supplied to the water sprinkling section 22 for adsorbing the impurities contained in the air.

When the temperature is high, such as in summer, the water sprinkling section 22 adsorbs impurities contained in the air by the impurity removing solution supplied from the drain tank 28 of the drain recovery / reprocessing section 25 and cleans the air. The converted air is guided to the cooler 23. The cooler 23 exchanges heat with the refrigerant supplied from the cooling medium supply device 26 to cool the air purified by the water sprinkling section 22, cools the air, increases the density thereof, and supplies the air to the intake port 20 of the air compressor 16. .

The cooler 23 collects the drain D generated during the heat exchange between the air and the refrigerant in the drain collecting section 27, and then supplies the drain D to the drain tank 28, where the impurity D is added. It is mixed with the removal solution and circulated through the drain recovery / recycling treatment reflux system 34.

As described above, in the present embodiment, the intake duct 2
1 is a drain collection / recovery processing unit which accommodates the water sprinkling unit 22 and supplies an impurity removing solution to the water sprinkling unit 22 to adsorb impurities contained in the air, and then recovers and regenerates the impurity removing solution for use. As a result, the output of the air compressor blades can be maintained as high as designed under stable operation of the air compressor blades without contaminants adhering to the air compressor blades, etc., thereby improving the plant thermal efficiency. Can be.

In the present embodiment, a cooler 23 is accommodated downstream of the water sprinkling section 22 of the intake duct 21 to cool the air and increase the density when the summer temperature is high, so that a high volume is achieved. Under weight, its output can be kept high as designed.

FIG. 2 is a schematic system diagram showing a second embodiment of an intake device for a thermal power plant according to the present invention. The same components as those of the first embodiment are denoted by the same reference numerals.

In this embodiment, the intake port 2 of the air compressor 16 is
0 is provided with a cylindrical intake duct 21.
Air intake duct 2 with its tip side bent at an angle of 90 °
1a, and the bent intake duct 21a
And a water sprinkling recovery tank 36 that guides the air to the opening 21b by confronting the opening 21b.

Further, in this embodiment, the impurity removing solution supplied from the filtration filter 30 of the drain recovery / recovery processing section 25 is sprayed in a mist state and guided to the opening 21 b while meandering from the water spray recovery tank 36. The water sprinkling section 22 that is brought into counterflow contact with air is bent and provided in the intake duct 21a. The other configuration is the same as that of the first embodiment, and the description of the configuration is omitted.

As described above, according to the present embodiment, the water sprinkling section 22 is provided in the bent air intake duct 21 a, and the opening 21 b of the bent air suction duct 21 a is extended toward the bottom side of the water sprinkling recovery tank 36. And the air meandering and guided from the sprinkle recovery tank 36 were brought into countercurrent contact with the impurity removal solution spouted in a mist form from the sprinkler. That the contact distance between the air and the compressed air can be shortened and effective impurities can be adsorbed, and the output of the air compressor can be maintained as high as designed without adhering impurities to the air compressor blades. Can be.

FIG. 3 is a schematic system diagram showing a third embodiment of an intake device for a thermal power plant according to the present invention. The same components as those of the first embodiment are denoted by the same reference numerals.

In the present embodiment, the drain recovery / regeneration section 25
Between the filtration filter 30 and the water sprinkling section 22 is provided an ion removing device 37 such as an ion exchange resin membrane for removing ions of the impurity removing solution, and the impurity removing solution from which the ions have been removed flows through the intake duct 21. The water spraying part 22 for jetting out mist toward the air is made of a low electric conductive material, for example, Teflon, and is charged with a flowing impurity removing solution.

As described above, the present embodiment is provided with the ion removing device 37 for removing the ions of the impurity removing solution, the flowing impurity removing solution is charged, and the water sprinkling section 22 is made of a low electric conductive material. Since the charge of the removal solution is maintained for a long time, impurities contained in the air can be effectively adsorbed, and the output of the air compressor can be adjusted to the design value without adhering the impurities to the air compressor blades and the like. Can be kept high. In the present embodiment, the impurity removing solution is charged. However, the impurities contained in the air may be charged by corona discharge or the like.

FIG. 4 is a schematic system diagram showing a fourth embodiment of an intake device for a thermal power plant according to the present invention. The same components as those of the first embodiment are denoted by the same reference numerals.

In this embodiment, the drain recovery / regeneration processing unit 25
The sprinkling section 22 for spraying the impurity-removed solution charged from the filtration filter 30 through the ion removing device 37 in the form of a mist toward the air flowing through the intake duct 21 is formed as a box section 22a. As shown in FIG. 5, the bottom plate 22b has a hole diameter of 1.0 to 1.5 mm.
Are formed in the range of the opening 38. The ejection port 38 may be formed in a solid cone shape, and the hole diameter of the solid cone shape may be in the range of 5 to 9 mm.

The hole diameter of the jet port 38 formed in the bottom plate 22b of the box portion 22a is set in the range of 1.0 to 1.5 mm.
Alternatively, the injection port 38 is formed in a solid cone shape, and the hole diameter is set in the range of 5 to 9 mm.
For example, when impurities contained in the air such as sodium hydroxide NaOH are, for example, carbon dioxide CO ₂ or sulfur dioxide SO ₂ , the pore diameter is such that these impurities are adsorbed in the largest amount, and confirmed by experiments.

As described above, in the present embodiment, the intake duct 2
1 is formed as a box portion 22a for spraying an impurity-removing solution into the air containing impurities flowing through the box 1 as a box portion 22a.
Spout 3 in the range of 1.5 mm, most preferably 1.2 mm
8, and when made into a solid cone, the hole diameter is 5-9mm
Of the air outlet 38, the impurities contained in the air can be effectively adsorbed, and the output of the air compressor can be reduced to a design value without adhering the impurities to the air compressor blades or the like. It can be maintained as high.

[0055]

As described above, the air-intake device of a thermal power plant according to the present invention is provided with a water spraying section for ejecting an impurity-removing solution in the form of a mist toward the air containing impurities in the air-intake duct. The drain recovery / recovery section for recovering / regenerating and reusing the impurity-removed solution having the impurities adsorbed therein is provided, so that a stable operation can be performed without causing impurities to adhere to the air compressor blades or the like.

Further, in the intake device of the thermal power plant according to the present embodiment, a cooler is accommodated downstream of the water sprinkling section accommodated in the intake duct to cool the intake air when the temperature is high as in summer. As the density is increased, the output of the air compressor can be maintained high even when the temperature is high.

[Brief description of the drawings]

FIG. 1 is a schematic system diagram showing a first embodiment of an intake device for a thermal power plant according to the present invention.

FIG. 2 is a schematic system diagram showing a second embodiment of an intake device for a thermal power plant according to the present invention.

FIG. 3 is a schematic system diagram showing a third embodiment of an intake device for a thermal power plant according to the present invention.

FIG. 4 is a schematic system diagram showing a fourth embodiment of an intake device for a thermal power plant according to the present invention.

FIG. 5 is a plan view seen from the direction of arrows AA in FIG. 4;

FIG. 6 is a schematic system diagram showing a first embodiment of a combined cycle power plant as a conventional thermal power plant.

FIG. 7 is a schematic system diagram showing a second embodiment of a combined cycle power plant as a conventional thermal power plant.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Gas turbine plant 2 Steam turbine plant 3 Exhaust heat recovery boiler 4 Air compressor 5 Gas turbine combustor 6 Gas turbine 7 Heat exchanger 8 Turbine shaft 9 Generator 10 Steam turbine 11 Condenser 12 Pump 13 Inlet 14 Cooler Reference Signs List 15 air purifier 16 air compressor 17 gas turbine combustor 18 gas turbine 19 generator 20 intake port 21 intake duct 21a bent intake duct 21b opening 22 watering part 22a box part 22b bottom plate 23 cooler 24 eliminator 25 drain recovery and regeneration Processing unit 26 Cooling medium supply device 27 Drain collecting unit 28 Drain tank 29 Pump 30 Filtration filter 31 Sprinkle collection unit 32 Pump 33 Drain regenerator 34 Drain collection and regeneration processing recirculation system 35 Makeup water supply unit 36 Sprinkle collection tank 37 Ion removal unit 38 ejection port

Claims (11)

[Claims] 1. A water sprinkling part which is housed in an air intake duct connected to an air inlet of an air compressor, and which spouts an impurity-removing solution to air containing the sucked impurities, and which is connected to the water sprinkling part,
A drain recovery / recovery processing unit that recovers and regenerates the drain of the impurity removal solution adsorbing impurities contained in the sucked air and supplies the drain to the water sprinkling unit again as the impurity removal solution. Intake device. 2. An air intake duct connected to an air inlet of an air compressor, wherein the air intake duct is formed by bending a front end side of the air intake duct, and the air including the impurity sucked is meandered in opposition to the air intake duct. A sprinkling tank for guiding to the opening of the intake duct, a sprinkling section for accommodating the impurity removing solution in counter-current contact with the air accommodated in the bent intake duct and guided in a meandering manner, and the impurity removal adsorbing impurities After collecting the drain of the solution in the sprinkle collection tank, regenerating the drain and supplying the impurity to the sprinkler again as an impurity removing solution. . 3. A cooler and an eliminator are sequentially provided along a flow of the sucked air on a downstream side of a water sprinkling section housed in one of the intake duct and the bent intake duct. 3. The intake device for a thermal power plant according to 1 or 2. 4. The intake device for a thermal power plant according to claim 3, wherein the eliminator is formed in a net shape. 5. The thermal power plant according to claim 3, wherein the cooler is provided with a drain collecting section for supplying drain generated when cooling the sucked air to a drain tank of a drain recovery / regeneration processing section. Power plant air intake system. 6. A drain tank for adding water to an impurity-removing substance to generate an impurity-removing solution in a drain-recovery processing unit, a filtration filter for supplying the impurity-removing solution from the drain tank to a water spraying unit, A drain regenerating device that adsorbs impurities contained in the air sucked into the impurity removing solution from the part to form a drain, separates the drain into sludge and clean water, and separates the clean water from the drain regenerating device into the drain tank. 3. A suction device for a thermal power plant according to claim 1, further comprising a drain recovery / recycling treatment reflux system for refluxing the wastewater. 7. An ion removing device is provided between a filtration filter and a sprinkling section of the drain recovery / recycling processing section to remove ions contained in an impurity removing solution to be supplied to the sprinkling section from the filtering filter and to remove the ions during the flow. 7. The air intake device for a thermal power plant according to claim 6, wherein the water sprinkling section is made of a low electric conductive material while being charged. 8. The air intake device for a thermal power plant according to claim 7, wherein the low electric conductive material is Teflon. 9. The air intake device for a thermal power plant according to claim 1, wherein the water spraying portion is formed as a box portion, and an outlet is formed in a bottom plate of the box portion. 10. The spout has a hole diameter of 1.0 to 1.5.
The intake device for a thermal power plant according to claim 9, wherein the intake device is set in a range of mm. 11. The air intake device for a thermal power plant according to claim 9, wherein the injection port is formed in a solid cone shape, and a hole diameter of the solid cone shape is set in a range of 5 to 9 mm.