JP2007224820A - Turbine facilities, heat recovery steam generator and water treatment method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide turbine facilities, a heat recovery steam generator and a water treatment method capable of maintaining a reference of conductivity in a system without influence in CO<SB>2</SB>due to ammonia injection even if pH is kept at 9.5 or higher. <P>SOLUTION: In the turbine facilities consists of a heat recovery steam generator 2 generating steam by heat from a heat source, a steam turbine 6 operated by steam of the heat recovery steam generator 2, a condenser 8 condensing exhaust gas of the steam turbine 8, and a water supply system feeding condensed water 50 condensed by the condenser 8 to the heat recovery steam generator 2 side via a condensed water line L0, an ammonia supplier 51 supplying any of ammonia gas or ammonia stock solution or ammonia diluent excluding CO2 to keep supply water in a drum of the heat recovery steam generator 2 pH 9.5 or higher and conductivity after passing through a cation ion exchange column at 0.3μS/cm or less is provided in the condensed water line L0 supplying the condensed water 50. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a turbine equipment that combines an exhaust heat recovery boiler apparatus and a steam turbine, an exhaust heat recovery boiler apparatus that generates steam by heat from a heat source, and a water treatment method that performs water treatment of a drum of the exhaust heat recovery boiler.

  From the viewpoint of effective use of energy resources and economic efficiency, various efficiency improvements have been made in power generation facilities (power generation plants). For example, a turbine power plant (combined power plant) combining a gas turbine and a steam turbine is one of them. In a combined power plant, high-temperature exhaust gas from a gas turbine is sent to an exhaust heat recovery boiler device, steam is generated in the exhaust heat recovery boiler device via a heating unit, and the generated steam is sent to a steam turbine to generate steam. I'm starting to work on a turbine. The heating unit has a economizer, superheater, boiler (drum and evaporator), etc. In order to improve the heat recovery rate of the boiler, multiple stages (for example, high pressure, medium pressure, low pressure) Is provided. Each of the high pressure, medium pressure, and low pressure heating units is provided with a superheater, a drum, and the like.

In the exhaust heat recovery boiler apparatus, multiple heating units are provided for each pressure, a number of pipes through which water, steam, etc. are sent between the units, and a pipe through which steam is sent between the steam turbines are provided. ing. These pipes are subjected to phosphate treatment and alkali treatment (water treatment) to prevent erosion and corrosion (erosion and corrosion). Specifically, sodium phosphate or caustic soda is injected into the drum of the heating unit to perform phosphoric acid treatment or alkali treatment to prevent erosion / corrosion in the piping.
In the water treatment in the conventional waste heat recovery boiler device, erosion and corrosion in the piping is prevented by phosphate treatment and alkali treatment, but in the waste heat recovery boiler device in which the heating unit is provided in multiple according to pressure, The injected sodium phosphate and alkali are concentrated particularly in the high pressure boiler section, causing a problem of alkali corrosion. In recent years, the regulation of phosphorus emitted from environmental problems has become a problem.

In view of the above problems, the present inventors have proposed that high pH operation be attempted (Patent Document 1).
An overall system diagram of the turbine equipment provided with the exhaust heat recovery boiler apparatus according to this proposal is shown in FIG. As shown in FIG. 9, the exhaust gas from the gas turbine 1 is sent to the exhaust heat recovery boiler 2, and the exhaust heat recovery boiler 2 includes a high pressure heating unit 3, an intermediate pressure heating unit 4, and a low pressure heating unit. 5 is provided. In the exhaust heat recovery boiler 2, steam is generated via the high-pressure heating unit 3, the intermediate-pressure heating unit 4, and the low-pressure heating unit 5, and the generated steam is sent to the steam turbine 6 to work on the steam turbine 6. ing. Exhaust gas from the steam turbine 6 is condensed and condensed by a condenser 8 and introduced into the exhaust heat recovery boiler 2 by a condensate pump 9. The exhaust heat recovery boiler device is configured by a water supply line 7 (a water supply system) from the exhaust heat recovery boiler 2 and the condensate pump 9.

  The high pressure heating unit 3 includes a high pressure superheater 11, a high pressure drum 12, a high pressure evaporator 13, and a high pressure economizer 14. Water in the high-pressure drum 12 is superheated and circulated in a high-pressure evaporator 13 disposed in the exhaust heat recovery boiler 2 to generate high-pressure steam in the high-pressure drum 12. The high-pressure steam generated in the high-pressure drum 12 is heated by the high-pressure superheater 11 disposed in the exhaust heat recovery boiler 2 and introduced into the steam turbine 6.

  The intermediate pressure heating unit 4 includes an intermediate pressure superheater 21, an intermediate pressure drum 22, an intermediate pressure evaporator 23, and an intermediate pressure economizer 24. Water in the intermediate pressure drum 22 is superheated and circulated in an intermediate pressure evaporator 23 disposed in the exhaust heat recovery boiler 2 to generate intermediate pressure steam in the intermediate pressure drum 22. The medium pressure steam generated in the medium pressure drum 22 is introduced into the reheater 25 through the medium pressure superheater 21, reheated by the reheater 25, and introduced into the steam turbine 6. The steam from the intermediate pressure superheater 21 is introduced to the gas turbine 1 side for cooling the high temperature portion (combustor, blades, etc.) of the gas turbine 1.

  The low pressure heating unit 5 includes a low pressure superheater 31, a low pressure drum 32, a low pressure evaporator 33, and a low pressure economizer 34. Water in the low-pressure drum 32 is superheated and circulated by a low-pressure evaporator 33 disposed in the exhaust heat recovery boiler 2, and low-pressure steam is generated in the low-pressure drum 32. The low pressure steam generated in the low pressure drum 32 is introduced into the steam turbine 6 through the low pressure superheater 21.

  Condensate from the condenser 8 is supplied to the low pressure drum 32 via the deaerator 10 and the low pressure economizer 34. A water supply line 41 connected to the high pressure drum 12 and the intermediate pressure drum 22 is provided in the flow path on the outlet side of the low pressure economizer 34, and water is supplied from the water supply line 41 to the high pressure drum 12 via the high pressure water supply pump 42. The intermediate pressure drum 22 is supplied with water through the intermediate pressure water supply pump 43. That is, water is supplied to the low-pressure drum 32, the intermediate-pressure drum 22 and the high-pressure drum 12 in parallel. The low-pressure drum 32 is a low-pressure unit drum, and the intermediate-pressure drum 22 and the high-pressure drum 12 are the high-pressure side. It is considered as a unit drum.

  A part of the condensate is returned to the condenser 8 on the inlet side of the deaerator 10, and a part of the water is returned to the deaerator 10 side by branching from the water supply line 41. The arrangement of each device in the exhaust heat recovery boiler 2 is an example, and the number and arrangement of the economizers and superheaters are appropriately changed depending on the performance of the gas turbine 1 and the like.

  The water supply line 7 which is a water supply system is provided with a chemical injection means 45 for injecting ammonia as a pH adjusting agent and hydrazine as a deoxidizing agent. A predetermined amount of ammonia is injected into the water supply for adjusting the pH from the chemical injection means 45 so that the pH of the water supply in the low-pressure drum 32 is 9.0 or higher and the ammonia concentration is 0.5 ppm or higher.

  Generally, when the pH of the feed water is less than 9.0, there is a concern that erosion / corrosion (corrosion / erosion) due to flow occurs. For this reason, the pH of the feed water in the low-pressure drum 32 is set to 9.0 or more. The pressure of the feed water in the low-pressure drum 32 is lower than the pressure of the feed water in the high-pressure drum 12 and the intermediate-pressure drum 22, and ammonia is more likely to evaporate. Since the distribution ratio between the gas phase and the liquid phase is high, the pH of the feed water in the low-pressure drum 32 is set to 9.0 or more so that the pH of the feed water in the high-pressure drum 12 and the intermediate pressure drum 22 is 9.0 Can also be high.

JP 2002-180804 A

However, when the pH is increased to 9.0 or higher (particularly pH 9.5 or higher), there is an influence of CO ₂ in the air or dissolved CO _{2 in} the ammonia diluted water in the ammonia injection. It will exceed the standard of electrical conductivity, causing a problem such as turbine corrosion, which is a problem.

In view of the above problems, the present invention is free from the influence of CO ₂ in ammonia injection even when the pH is increased to 9.5 or higher, and the turbine equipment and exhaust system that can maintain the standard of electrical conductivity in the system. It is an object to provide a heat recovery boiler device and a water treatment method.

A first invention of the present invention for solving the above-mentioned problems is an exhaust heat recovery boiler that generates steam by heat from a heat source, a steam turbine that operates by steam of the exhaust heat recovery boiler, and exhaust of the steam turbine. In a turbine facility consisting of a condenser for condensing and a water supply system for supplying the condensed water condensed in the condenser to the exhaust heat recovery boiler side, exhaust heat recovery is performed on the condensate line for supplying the condensate. Ammonia gas or ammonia excluding CO ₂ so that the pH of the feed water in the boiler drum is 9.5 or higher and the electric conductivity after passing through the cation ion exchange column is 0.3 μS / cm or lower. The turbine equipment is provided with an ammonia supply device for supplying either a stock solution or an ammonia dilution solution.

A second invention is the turbine equipment according to the first invention, wherein a measuring device for measuring the amount of CO ₂ in the steam is provided in the steam line supplied to the steam turbine.

  A third invention is a turbine facility according to the first or second invention, wherein the heat from the heat source is a combined plant which is exhaust gas gas.

  A fourth invention is the turbine equipment according to any one of the first to third inventions, wherein the ammonia supplier is either an ammonia gas cylinder or an ammonia vaporizer having a heating tank.

A fifth aspect of the invention is absorbed in any one invention of the first to third, the ammonia supply device is, ammonia concentrate reservoir having a heating tank, the CO ₂ in the air supplied to the ammonia concentrate reservoir And a CO ₂ absorption column.

  According to a sixth invention, in any one of the first to third inventions, the ammonia feeder includes an ammonia stock solution storage container, an ammonia diluted water storage container to which an ammonia stock solution is supplied from the ammonia stock solution storage container, The turbine equipment includes a deaeration tank that deaerates water supplied to the ammonia diluted water storage container to obtain deaerated water.

A seventh invention is the ammonia according to any one of the first to third aspects, wherein the ammonia supplier dilutes the ammonia stock solution storage container and the ammonia stock solution supplied from the ammonia stock solution storage container with pure water for dilution. An ammonia dilution water storage container for storing dilution water, an anion exchange resin column for removing CO ₂ in the diluted ammonia water supplied from the ammonia dilution water storage container, and air in the air supplied to the ammonia dilution water storage container lying in turbine equipment characterized by comprising a CO ₂ absorption column to absorb CO _2.

An eighth invention is an exhaust heat recovery boiler that includes a high-pressure side unit that generates high-pressure side steam and a low-pressure side unit that generates low-pressure side steam and recovers heat from a heat source to generate high-pressure side steam and low-pressure side steam. In the exhaust heat recovery boiler apparatus comprising a water supply system for supplying water to the exhaust heat recovery boiler, the pH of the supply water in the drum of the exhaust heat recovery boiler is set to 9.5 or more in the condensate line supplying the condensate And an ammonia supplier for supplying either ammonia gas excluding CO ₂ or ammonia stock solution or ammonia dilution so that the electrical conductivity after passing through the cation ion exchange column is 0.3 μS / cm or less. An exhaust heat recovery boiler apparatus is provided.

  A ninth invention is the exhaust heat recovery boiler apparatus according to the eighth invention, wherein the ammonia supplier is either an ammonia gas cylinder having a heating tank or an ammonia vaporizer.

According to a tenth aspect, in the eighth aspect, the ammonia supplier has an ammonia stock solution storage container having a heating tank, and a CO ₂ absorption column that absorbs CO ₂ in the air supplied to the ammonia stock solution storage container; It is in the waste heat recovery boiler apparatus characterized by comprising.

  In an eleventh aspect based on the eighth aspect, the ammonia feeder is provided in an ammonia stock solution storage container, an ammonia diluted water storage container to which the ammonia stock solution is supplied from the ammonia stock solution storage container, and the ammonia diluted water storage container. The exhaust heat recovery boiler apparatus includes a deaeration tank that degass the supplied water to obtain deaerated water.

In a twelfth aspect based on the eighth aspect, the ammonia feeder stores the ammonia stock solution storage container and ammonia diluted water obtained by diluting the ammonia stock solution supplied from the ammonia stock solution storage container with pure water for dilution. A dilution water storage container, an anion exchange resin column that removes CO ₂ in the diluted ammonia water supplied from the ammonia dilution water storage container, and CO that absorbs CO ₂ in the air supplied to the ammonia dilution water storage container _It is in the waste heat recovery boiler apparatus characterized by comprising ₂ absorption columns.

A thirteenth aspect of the invention is a water treatment method for an exhaust heat recovery boiler that generates steam by evaporating / superheating the feed water of a drum by heat from a heat source, wherein the pH of the feed water in the drum is 9.5 or more, Water that is supplied with either ammonia gas, ammonia stock solution, or ammonia dilution solution excluding CO ₂ so that the electric conductivity after passing through the cation ion exchange column is 0.3 μS / cm or less. It is in the processing method.

According to the present invention, when ammonia is supplied to the condensate line, the pH is maintained at a high level of 9.5 or higher and CO ₂ contamination is eliminated. Does not exceed the reference value (0.3 μS / cm), and turbine corrosion and the like are eliminated.

  Hereinafter, the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the embodiments. In addition, constituent elements in the following embodiments include those that can be easily assumed by those skilled in the art or those that are substantially the same.

A turbine facility provided with an exhaust heat recovery boiler apparatus according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a schematic diagram illustrating a turbine facility including an exhaust heat recovery boiler apparatus according to an embodiment. In addition, about the structure same as the turbine equipment provided with the waste heat recovery boiler apparatus which concerns on the prior art shown in FIG. 9, the same code | symbol is attached | subjected and description is abbreviate | omitted.
As shown in FIG. 1, the turbine equipment provided with the exhaust heat recovery boiler apparatus according to this embodiment is operated by the exhaust heat recovery boiler 2 that generates steam by the heat from the heat source, and the steam of the exhaust heat recovery boiler 2. The steam turbine 6, the condenser 8 that condenses the exhaust of the steam turbine 6, and the condensate 50 condensed in the condenser 8 is supplied to the exhaust heat recovery boiler 2 side via the condensate line L _0. In a turbine facility comprising a feed water system, the pH of the feed water in the drum of the exhaust heat recovery boiler 2 is set to 9.5 or higher in the condensate line L ₀ for feeding the condensate 50, and a cation ion exchange column is installed. An ammonia supplier 51 for supplying either ammonia gas excluding CO ₂ , ammonia stock solution or ammonia diluted solution is provided so that the electrical conductivity after passing is 0.3 μS / cm or less. . Here, in FIG. 1, reference numeral 53-1 is an electric conductivity meter interposed condensate line L _0, 53-2 is interposed in the branch steam line L _SD branching from steam line L _S An electrical conductivity meter 56 is an oxygen scavenger supplier for supplying an oxygen scavenger such as hydrazine, and a pH meter 80 is interposed in the condensate line L ₀ .

In this embodiment, interposed the steam turbine 6 to supply steam line L _S from branched branch steam line L _SD cation exchange resin (for example, hydrogen type cation exchange resin) column 55, measurement of the electrical conductivity , The acid electrical conductivity is measured after passing through the cation exchange resin column 55 once to measure HCO ₃ ⁻ ions.

Here, as an example of the combined cycle plant, the water supply amount is 523.4 t / h, the ammonia injection amount is 2 L / h, and the CO ₂ absorption amount to ammonia is 0.665 ml / ml (1280 mg / ml) at 30 ° C. in FIG. If l), the amount of CO _{2 in} the feed water is as follows.
CO ₂ amount = 2 × 0,001 / 523.4 × 1280 = 0.005 mg / l (per hour)
Therefore, in the operation for 24 hours, it becomes 0.12 mg / l, and exceeds 0.3 μS / cm due to the relationship between CO ₂ and electric conductivity in FIG.
Therefore, one of ammonia (ammonia gas, ammonia stock solution, or ammonia dilution solution) 52 excluding CO ₂ is supplied so that the electric conductivity after passing through the cation ion exchange column is 0.3 μS / cm or less. An ammonia supplier 51 is provided to maintain the reference value.

Hereinafter, various configurations for preventing CO ₂ from being brought in will be described.

FIG. 2 is a partial schematic diagram of a turbine facility provided with an exhaust heat recovery boiler apparatus that prevents CO ₂ from being brought in according to the present embodiment. In addition, about the structure same as the turbine equipment provided with the exhaust-heat-recovery boiler apparatus which concerns on Example 1 shown in FIG. 1, the same code | symbol is attached | subjected and description is abbreviate | omitted (same below).
As shown in FIG. 2, in this embodiment, the ammonia supplier 51 </ b> A that supplies the condensate line L ₀ includes an ammonia gas cylinder 57 and a heating tank 58 that heats the ammonia gas cylinder 57.
Then, so that to each feed ammonia gas 52A to the condensate line L ₀ by the first ammonia gas supply line L ₁ and the second ammonia gas supply line L _2. Here, the supply of the ammonia gas 52A may use either the first ammonia gas line L _{1 or} the second ammonia gas line L ₂ .

In the present embodiment, ammonia is supplied in a gas state to the condensate line L ₀ , so that there is no mixing of CO _{2 in} the condensate 50, and the measured value of electric conductivity in the steam line is the reference value (0.3 μS / cm).
Therefore, the measured value of the electrical conductivity in the steam line does not exceed the reference value (0.3 μS / cm), so that turbine corrosion or the like is eliminated.

  Further, in the present embodiment, the ammonia gas cylinder 57 having the heating tank 58 is illustrated, but the present invention is not limited to this, and an ammonia vaporizer capable of supplying ammonia gas, for example, may be used. Good.

[Test example]
FIG. 8 shows the test results of the conventional case where CO ₂ is not removed and the case where CO ₂ is removed (50% removal). FIG. 8 is a relationship diagram between carbon dioxide concentration and elapsed time. As shown in FIG. 8, in the test example (solid line), even when 100 hours have elapsed, CO ₂ is 0.08 mg / l and does not exceed the reference value of 0.12 mg / l. The example (broken line) exceeded 0.12 mg / l after about 40 hours, and increased gradually thereafter.

FIG. 3 is a partial schematic diagram of a turbine facility provided with an exhaust heat recovery boiler apparatus that prevents CO ₂ from being brought in according to the embodiment. As shown in FIG. 3, in the present embodiment, the ammonia supplier 51 </ b> B that supplies the condensate line L ₀ includes an ammonia stock solution drum can 60 that is an ammonia stock solution storage container having a heating tank 58, and the ammonia stock solution drum can 60. And a CO ₂ absorption column 63 that absorbs CO ₂ in the air supplied when the ammonia stock solution (28%) 52B is expelled from the atmosphere.

Then, the ammonia stock solution 52B is supplied to the condensate line L ₀ by the third ammonia stock solution supply line L ₃ and the fourth ammonia stock solution supply line L ₄ , respectively. Here, the supply of the ammonia stock solution 52B may use either the third ammonia stock solution supply line L _{3 or} the fourth ammonia stock solution supply line L ₄ .
The fourth ammonia gas line L ₄ that supplies the ammonia stock solution 52B to the downstream side of the condensate pump 9 is provided with a booster pump P ₁ so that it is supplied to the condensate 50 after being pressurized. Yes.

The CO ₂ absorption column 63 removes CO ₂ in the air, thereby preventing CO ₂ from being mixed into the ammonia stock solution.
Therefore, when supplying to the condensate line L ₀ , ammonia is supplied into the condensate 50 while removing CO ₂ in the air, so that there is no CO ₂ contamination and electric conduction in the steam line. The measured value of the rate does not exceed the reference value (0.3 μS / cm).

FIG. 4 is a partial schematic diagram of a turbine facility provided with an exhaust heat recovery boiler apparatus that prevents CO ₂ from being brought in according to the embodiment. As shown in FIG. 4, in this embodiment, the ammonia supplier 51C that supplies the condensate line L ₀ includes an ammonia stock solution drum 60 that includes a CO ₂ absorption column 63 that absorbs CO ₂ in the air, From an ammonia dilution tank 62 to which an ammonia raw solution (28% solution) 52B is supplied from an ammonia raw drum can 60, and a degassing tank 64 that degass the diluted water supplied to the ammonia dilution tank 62 to obtain degas water 65. It is configured.

Then, with ammonia diluent supply line L ₆ of the ammonia diluting dilution aqueous ammonia 52C diluted in the tank 62 the fifth ammonium diluent supply line L ₅ and the sixth, ammonia dilution water 52C in condensate line L ₀ Each is supplied. Here, the ammonia diluted water 52C may be supplied using either the fifth ammonia diluted water supply line L _{5 or} the sixth ammonia diluted water supply line L ₆ .
The sixth ammonia gas line L ₆ that supplies the ammonia dilution water 52C to the downstream side of the condensate pump 9 is provided with a booster pump P ₁ as in the third embodiment, and is recovered after boosting. The water 50 is supplied.

Wherein is intended to degas the air deaeration tank 64 the dilution water, during the degassing, to remove the CO _2, when supplying ammonia stock 52B uses the CO ₂ absorption column 63 Thus, CO _{2 in} the air is removed, so that these prevent CO ₂ from being mixed into the ammonia diluted water.
Therefore, when supplying to the condensate line L ₀ , the diluted ammonia water 52C from which CO ₂ has been removed is supplied, so that no CO ₂ is mixed, and the measured value of the electrical conductivity in the steam line is the reference value (0. 3 μS / cm) is not exceeded.

FIG. 5 is a partial schematic diagram of a turbine facility provided with an exhaust heat recovery boiler apparatus that prevents CO ₂ from being brought in according to the embodiment. As shown in FIG. 5, in this embodiment, the ammonia supplier 51D that supplies the condensate line L ₀ includes the ammonia stock solution drum 60 and the ammonia dilution storage container supplied from the ammonia stock solution drum 60. An ammonia dilution tank 62 for storing ammonia dilution water 52C obtained by diluting the stock solution 52B with pure water 74 for dilution; an anion exchange resin column 73 for removing CO ₂ in the diluted ammonia water 52C supplied from the ammonia dilution tank 62; And a CO ₂ absorption column 70 that absorbs CO ₂ in the air supplied to the ammonia dilution tank 62.
Further, in this embodiment, an anion exchange resin column 73 interposed in the tank circulation line L ₇ is interposed, and CO ₂ in the diluted ammonia water 52C is removed when circulating. .

Then, with ammonia diluent supply line L ₆ of the ammonia diluting dilution aqueous ammonia 52C diluted in the tank 62 the fifth ammonium diluent supply line L ₅ and the sixth, ammonia dilution water 52C in condensate line L ₀ Each is supplied. Here, the ammonia diluted water 52C may be supplied using either the fifth ammonia diluted water supply line L _{5 or} the sixth ammonia diluted water supply line L ₆ .

  Instead of supplying the ammonia stock solution 52B, the ammonia gas 52A may be supplied from the denitration ammonia vaporizer 72.

In the degassing tank 64, air in the diluted water is degassed. During the degassing, the CO ₂ is removed and the CO ₂ absorption column 63 is used to supply the ammonia stock solution 52B. since followed by removal of CO ₂ in air Te, these, to prevent contamination of the CO ₂ into ammonia diluted in water.
Therefore, when supplying to the condensate line L ₀ , the diluted ammonia water 52C from which CO ₂ has been removed is supplied, so that no CO ₂ is mixed, and the measured value of the electrical conductivity in the steam line is the reference value (0. 3 μS / cm) is not exceeded.

As described above, the turbine equipment according to the present invention includes an exhaust heat recovery boiler that generates steam by heat from a heat source, a steam turbine that operates with the steam of the exhaust heat recovery boiler, and a condenser that condenses the exhaust of the steam turbine. In turbine equipment consisting of a water supply and a water supply system that feeds the condensate condensed in the condenser to the exhaust heat recovery boiler side, the pH of the supply water in the drum of the exhaust heat recovery boiler is maintained at 9.5 or higher In addition, since CO ₂ in the ammonia to be supplied is removed, the electric conductivity after passing through the cation ion exchange column of the vapor in the vapor line can be 0.3 μS / cm or less, It is possible to provide a turbine equipment in which the inside of the pipe is maintained at an appropriate pH and electric conductivity, and the problem of alkali corrosion is eliminated and erosion and corrosion inside the pipe can be prevented. The

  Moreover, since the heat from the heat source is a combined plant that is the exhaust of the gas turbine, the combined plant combining the gas turbine and the steam turbine can eliminate the problem of alkali corrosion and prevent erosion and corrosion in the piping. It becomes possible to make it an equipment.

The exhaust heat recovery boiler apparatus of the present invention comprises a high-pressure side unit that generates high-pressure side steam and a low-pressure side unit that generates low-pressure side steam, and recovers heat from a heat source to generate high-pressure side steam and low-pressure side steam. In an exhaust heat recovery boiler apparatus comprising a heat recovery boiler and a water supply system for supplying water to the exhaust heat recovery boiler, the pH of the feed water in the drum of the exhaust heat recovery boiler is maintained at 9.5 or higher, and ammonia is supplied since followed by removal of the CO _2, the electrical conductivity after passing through the cation exchange column of steam in the steam line can be less 0.3 microsecond / cm, proper in the pipe is pH and It is possible to provide a turbine facility that is maintained at electric conductivity and can eliminate the problem of alkaline corrosion and prevent erosion and corrosion in the pipe.

The water treatment method of the present invention is a water treatment method for an exhaust heat recovery boiler that generates steam by evaporating and overheating the feed water of the drum by heat from a heat source, wherein the pH of the feed water in the drum of the exhaust heat recovery boiler is 9 .5 or more and CO ₂ in the supplied ammonia is removed, so that the electric conductivity of the vapor line after passing through the cation ion exchange column is 0.3 μS / cm or less. Therefore, it is possible to provide a turbine equipment in which the inside of the pipe is maintained at an appropriate pH and electric conductivity, and the problem of alkali corrosion is eliminated and erosion and corrosion inside the pipe can be prevented.

As described above, in the present invention, the pH of the feed water in the drum of the exhaust heat recovery boiler is maintained at 9.5 or higher, and CO ₂ in the supplied ammonia is removed. Used for turbine equipment that can reduce the electrical conductivity of steam after passing through a cation ion exchange column to 0.3 μS / cm or less, and eliminate erosion / corrosion in piping by eliminating the problem of alkaline corrosion. Is suitable.

1 is an overall system schematic diagram of a turbine facility provided with an exhaust heat recovery boiler apparatus according to a first embodiment of the present invention related to Example 1. FIG. I am a partial schematic view of a turbine equipment provided with a waste heat recovery boiler device for preventing carry-in CO ₂ according to the second embodiment. It is a partial schematic view of a turbine equipment provided with a waste heat recovery boiler device for preventing carry-in CO ₂ according to the third embodiment. It is a partial schematic view of a turbine equipment provided with a waste heat recovery boiler device for preventing carry-in CO ₂ according to the fourth embodiment. It is a partial schematic view of a turbine equipment provided with a waste heat recovery boiler device for preventing carry-in CO ₂ according to the fifth embodiment. It is a relationship diagram of electrical conductivity (μS / cm) and carbon dioxide concentration (mg / l). It is a carbon dioxide Bunsen absorption coefficient (standard atmospheric pressure) figure. It is a related figure of carbon dioxide concentration and elapsed time. It is a whole system schematic diagram of turbine equipment provided with a waste heat recovery boiler device concerning a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Gas turbine 2 Waste heat recovery boiler 3 High pressure heating unit 4 Medium pressure heating unit 5 Low pressure heating unit 6 Steam turbine 7 Water supply line 8 Condenser 9 Condensate pump 10 Deaerator 11 High pressure superheater 12 High pressure drum 13 High pressure evaporator 51 Ammonia Feeder 52 Ammonia 52A Ammonia Gas 52B Ammonia Stock Solution 52C Dilute Ammonia Water 53-1 First Electric Conductivity Meter 52-2 Second Electric Conductivity Meter

Claims (13)

An exhaust heat recovery boiler that generates steam by heat from the heat source, a steam turbine that operates with the steam of the exhaust heat recovery boiler, a condenser that condenses the exhaust of the steam turbine, and condensate condensed in the condenser In turbine equipment consisting of a water supply system that feeds the waste heat to the exhaust heat recovery boiler side,
In the condensate line for supplying the condensate, the pH of the feed water in the drum of the exhaust heat recovery boiler is set to 9.5 or more, and the electric conductivity after passing through the cation ion exchange column is 0.3 μS / cm or less. As described above, the turbine equipment is provided with an ammonia supply device for supplying either ammonia gas excluding CO ₂ , ammonia stock solution or ammonia dilution solution. In claim 1,
A turbine facility comprising a measuring device for measuring the amount of CO ₂ in steam in a steam line supplied to the steam turbine. In claim 1 or 2,
A turbine facility characterized in that the heat from the heat source is a combined plant that is exhaust of a gas turbine. In any one of Claims 1 thru | or 3,
Turbine equipment, wherein the ammonia supplier is either an ammonia gas cylinder having a heating tank or an ammonia vaporizer. In any one of Claims 1 thru | or 3,
Turbine equipment, wherein the ammonia feeder comprises an ammonia stock solution storage container having a heating tank, and a CO ₂ absorption column that absorbs CO ₂ in the air supplied to the ammonia stock solution storage container. In any one of Claims 1 thru | or 3,
The ammonia feeder includes an ammonia stock solution storage container, an ammonia diluted water storage container to which an ammonia stock solution is supplied from the ammonia stock solution storage container, and deaerated water by degassing water supplied to the ammonia diluted water storage container, A turbine equipment comprising a deaeration tank. In any one of Claims 1 thru | or 3,
The ammonia supplier includes an ammonia stock solution storage container, an ammonia diluted water storage container for storing ammonia diluted water obtained by diluting the ammonia stock solution supplied from the ammonia stock solution storage container with pure water for dilution, and the ammonia diluted water storage An anion resin exchange column for removing CO _{2 in} diluted ammonia water supplied from a container, and a CO ₂ absorption column for absorbing CO ₂ in air supplied to the ammonia diluted water storage container. Turbine equipment. Exhaust heat recovery boiler that consists of a high-pressure side unit that generates high-pressure side steam and a low-pressure side unit that generates low-pressure side steam to recover heat from the heat source and generate high-pressure side steam and low-pressure side steam, and an exhaust heat recovery boiler In an exhaust heat recovery boiler device comprising a water supply system for supplying water,
In the condensate line for supplying the condensate, the pH of the feed water in the drum of the exhaust heat recovery boiler is set to 9.5 or more, and the electric conductivity after passing through the cation ion exchange column is 0.3 μS / cm or less. As described above, an exhaust heat recovery boiler apparatus comprising an ammonia supply device for supplying either ammonia gas excluding CO ₂ , an ammonia stock solution, or an ammonia dilution solution. In claim 8,
The exhaust heat recovery boiler apparatus, wherein the ammonia supplier is either an ammonia gas cylinder having a heating tank or an ammonia vaporizer. In claim 8,
The ammonia supply apparatus includes an ammonia stock solution storage container having a heating tank, and a CO ₂ absorption column that absorbs CO ₂ in the air supplied to the ammonia stock solution storage container. apparatus. In claim 8,
The ammonia feeder includes an ammonia stock solution storage container, an ammonia diluted water storage container to which an ammonia stock solution is supplied from the ammonia stock solution storage container, and deaerated water by degassing water supplied to the ammonia diluted water storage container, An exhaust heat recovery boiler apparatus comprising a deaeration tank that performs the above operation. In claim 8,
The ammonia supplier includes an ammonia stock solution storage container, an ammonia diluted water storage container for storing ammonia diluted water obtained by diluting the ammonia stock solution supplied from the ammonia stock solution storage container with pure water for dilution, and the ammonia diluted water storage An anion exchange resin column for removing CO _{2 in} diluted ammonia water supplied from a container, and a CO ₂ absorption column for absorbing CO ₂ in air supplied to the ammonia diluted water storage container. Waste heat recovery boiler equipment. In the heat treatment method of the exhaust heat recovery boiler that generates steam by evaporating and overheating the drum feed water by heat from the heat source, the pH of the feed water in the drum is set to 9.5 or higher and passes through the cation ion exchange column. A water treatment method comprising supplying ammonia gas, ammonia stock solution, or ammonia dilution solution excluding CO ₂ so that the electrical conductivity after the treatment is 0.3 μS / cm or less.

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