JP2008196833A - Turbine equipment, exhaust heat recovering boiler apparatus and operation method for turbine equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide turbine equipment, an exhaust heat recovering boiler apparatus and an operation method for turbine equipment, remarkably reducing a scale adhesion rate of a high-pressure water supply control valve. <P>SOLUTION: A scale generation/adhesion device 60 is interposed between a high-pressure economizer 14 and a high-pressure water supply control valve 50 of a high-temperature and high-pressure water supply line LH for supplying high-temperature and high-pressure supply water 101 supplied to a high-pressure drum 12 of a high-pressure heating unit in a pressurizing unit, thereby disturbing the flow of the high-temperature and high-pressure supply water 101 in the interior to cause generation and adhesion of scale of iron oxide. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a turbine facility capable of long-term continuous operation, an exhaust heat recovery boiler device, and a method for operating the turbine facility.

  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) It 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 or alkali treatment (water treatment) to prevent erosion / corrosion. Specifically, sodium phosphate or caustic soda is injected into the drum of the heating unit to perform phosphate 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, There has been a problem that the injected sodium phosphate and alkali are concentrated particularly in the high-pressure boiler section to cause 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. 6, 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. The 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 part (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 31.

  Condensate 50 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. Reference numeral 44 denotes a circulation pump that circulates water supplied from the low-pressure economizer 34.

  A part of the condensate 50 is returned to the condenser 8 on the inlet side of the deaerator 10, and a part of 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.

  A water supply line 7 serving as a water supply system is provided with a chemical injection means 45 for injecting a chemical 46 of 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.

In general, when the pH of the feed water is less than 9.0, there is a concern about the occurrence of erosion and corrosion (corrosion and erosion) due to flow. 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 easier to evaporate and lower in pressure, so that it is easier to mix in the gas phase side (i.e., difficult to mix in the liquid phase). 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 higher 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. Moreover, as the chemical | medical agent 47 of the high pressure drum 12, the intermediate pressure drum 22, and the low pressure drum 32, since ammonia tends to volatilize, sodium phosphate is used from the point of preventing pH fall.
In addition, the standard of pH of water supply and boiler water is defined in JIS (nonpatent literature 1).

JP 2002-180804 A JP-A-5-264492 JIS B8223-1999

  By the way, in recent years, high-pressure water supply to high-pressure drums has been performed due to improvement in operation efficiency, and operation under a wide load condition is required so as to cope with fluctuations in daily power demand. As a result, a high-pressure feed water control valve (not shown) for controlling the high-pressure feed water supplied to the high-pressure drum is required to have a wide flow rate control range. As the high-pressure water supply control valve for controlling the high-pressure water supply, for example, a perforated plate single-stage water supply control valve 100A having a single-stage perforated plate for adjusting the amount of feed water shown in FIG. 7 or a perforated plate shown in FIG. A multi-stage perforated plate multi-stage water supply control valve 100B or the like is used. However, when continuously operated, iron components dissolved in the high-pressure water supply 101 adhere to the hole of the valve and the blockage of the hole proceeds. However, the valve opening may increase to maintain the flow rate.

  The multistage structure of the perforated plate constituting the perforated plate multistage water supply control valve 100B will be described with reference to FIGS. As shown in FIG. 9 to FIG. 10, the multistage structure of the perforated plate is formed by laminating a plurality of segment plates 111 having a plurality of holes 110 opened, and a plug 112 is inserted in the central portion thereof to control the flow rate of fluid. It is adjusted. FIG. 10 schematically shows the configuration of the segment plate 111 and shows how the high-pressure water supply 101 passes through the plurality of holes 110.

Here, the phenomenon in which the dissolved iron component precipitates in the orifice portion through which the high-pressure feed water flows is shown in FIG.
As shown in FIG. 11, the boiler feed water at about 200 ° C. is heated to about 300 ° C. by passing through the high-pressure economizer 14, and the iron component in the high-pressure feed water 101 is in a so-called “supersaturated” state described later. Thus, there is a possibility that iron oxide (scale) precipitates in equilibrium.

  In a situation where the flow is slow in a pipe having a large diameter (flow velocity to 3 m / s), iron oxide exists as fine particles without growing up to particles of a size sufficiently large to stably exist as “crystals”. Or the iron ions (Fen +) are presumed to exist, but since the fine particles or iron ions are in an unstable state, the water supply containing them is a hole such as a perforated plate. When passing through the orifice portion 103, a high flow rate state occurs, so that the fine particles or iron ions mentioned above are supplied to the vicinity of the orifice wall more frequently than in the case of a normal pipe wall surface, and a sudden flow state change is caused. By receiving, fine particles or iron ions become more unstable and easily precipitated.

  As a result, iron oxide crystals (Fe 3 O 4) 104 are deposited mainly on the inlet side surface of the orifice portion 103. As a result of the deposited crystals (scale) 104 gradually closing the holes, the flow rate is lowered, and the opening of the valve increases according to the degree of scale adhesion. On the rear side of the orifice part 103, there is a stagnation part 105 at the rear part of the orifice where the flow “stagnates”. In these parts, the substance supply rate is slower than that of the high flow rate part, but the crystal 104 is stable. It is considered to grow.

  Next, in order to explain the supersaturated state in the boiler feed water, FIG. 12 shows the relationship between the water temperature and the iron solubility at pH 9.3. As shown in FIG. 12, when the temperature of the high-pressure feed water reaches around 200 ° C., the solubility of iron reaches its maximum state, and when the temperature rises without precipitation of iron as it is, the iron in the high-pressure feed water exceeds the amount dissolved at that temperature. It becomes a dissolved (supersaturated) state.

  For example, as shown in FIG. 12, in the case of about 220 ° C., when 1.7 ppb of iron is dissolved in high-temperature water supply rises to 350 ° C. at the outlet of the high-pressure economizer 14, Since only 3 ppb can be dissolved, the difference of 1.4 ppb is in a supersaturated dissolved state, and there is a possibility of scale precipitation in equilibrium.

  In addition, when a scale adheres to the valve hole, maintenance is required when the opening of the water supply control valve reaches approximately 90%. However, since maintenance costs increase, there is a desire to reduce the number of times of maintenance as much as possible. In particular, if maintenance is performed at the same time as periodic inspections of power generation facilities (power generation plants), this is an ideal state in which inspections and inspections can be performed at one time. Unlike the ideal state (solid line: reference numeral 1000) as shown, there are also plants in a state (broken line: reference numeral 1001) where maintenance is required without waiting for the conventional periodic inspection period. is the current situation.

  In particular, in order to cope with the prolonged operation of the combined cycle plant, the appearance of a technique for reducing the scale adhesion rate in the high-pressure feed water control valve is eagerly desired.

  In view of the above problems, an object of the present invention is to provide a turbine equipment, an exhaust heat recovery boiler apparatus, and a method for operating the turbine equipment that can significantly reduce the scale adhesion rate of the high-pressure feed water control valve.

  A first invention of the present invention for solving the above-mentioned problems includes a steam turbine that is operated by steam generated through a plurality of stages of different pressure units, a condenser that condenses the exhaust of the steam turbine, and Supplying high-temperature and high-pressure water to be supplied to the high-pressure drum of the high-pressure heating unit in the turbine unit comprising a water supply system that supplies the condensate condensed in the condenser to the exhaust heat recovery boiler side A scale generator / attachment device is installed between the high-pressure economizer and high-pressure water supply control valve of the high-temperature and high-pressure water supply line that disturbs the flow of high-temperature water supply and generates and attaches scale. The turbine equipment is characterized by

  A second invention is the turbine according to the first invention, wherein the scale generator / attachment device has a plurality of baffle plates arranged alternately along the flow direction of the high-temperature high-pressure feed water. In the facilities.

  A third invention is characterized in that, in the first invention, the scale generating / attaching device is provided with a plurality of bamboo knots having a hollow center along the flow direction of the high-temperature and high-pressure water supply therein. It is in the turbine equipment.

  A fourth invention is the turbine equipment according to the first invention, wherein the scale generating / attaching device has a spiral portion formed therein.

  A fifth invention is the invention according to any one of the first to fourth inventions, wherein ammonia is at a pH of 9.6 or more between the high pressure economizer and the scale generator / deposit device or in the scale generator / deposit device. The turbine equipment is characterized by being injected as described above.

  A sixth invention is the turbine equipment according to any one of the first to fifth inventions, wherein the temperature of the high-pressure feed water supplied to the high-pressure drum is 250 ° C. or higher.

  A seventh invention is the turbine equipment according to any one of the first to sixth inventions, wherein the high-pressure water supply control valve is a perforated plate multistage water supply control valve.

  An eighth invention is the turbine equipment according to any one of the first to seventh inventions, wherein the heat from the heat source is a combined plant that is exhaust gas gas.

  A ninth aspect of the 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. A high-pressure section of a high-temperature high-pressure water supply line for supplying high-temperature high-pressure feed water to be supplied to a high-pressure drum of a high-pressure heating unit in the pressure unit. An exhaust heat recovery boiler which is provided between a charcoal unit and a high-pressure water supply control valve, and has a scale generating / attaching device which disturbs the flow of high temperature water supply and generates and adheres scale. In the device.

  A tenth aspect of the invention is the exhaust heat recovery boiler according to the ninth aspect of the invention, wherein the scale generator / attachment device has a plurality of baffle plates arranged alternately along the flow direction of the high-temperature high-pressure feed water. In the device.

  An eleventh aspect of the invention is the exhaust heat according to the ninth aspect of the invention, wherein the scale generator / attachment device includes a plurality of hollow bamboo joints arranged in the center along the flow direction of the high-temperature high-pressure feed water. In the recovery boiler unit.

  A twelfth aspect of the invention is the exhaust heat recovery boiler apparatus according to the ninth aspect of the invention, wherein the scale generation / attachment device is formed with a spiral portion therein.

  In a thirteenth aspect of the present invention, in any one of the ninth to twelfth aspects of the invention, ammonia is adjusted to a pH of 9.6 or more between the high-pressure economizer 14 and the scale generator / deposit device or in the scale generator / deposit device. The exhaust heat recovery boiler apparatus is characterized by being injected as described above.

  A fourteenth invention is the exhaust heat recovery boiler apparatus according to any one of the ninth to thirteenth inventions, wherein the temperature of the high-pressure feed water supplied to the high-pressure drum is 250 ° C. or higher.

  A fifteenth aspect of the invention is the exhaust heat recovery boiler apparatus according to any one of the ninth to fourteenth aspects, wherein the high-pressure feed water control valve is a perforated plate multi-stage feed water control valve.

  A sixteenth aspect of the invention relates to a steam turbine that is operated by steam generated through a plurality of stages of different pressure units, a condenser that condenses the exhaust of the steam turbine, and condensate condensed in the condenser. In the operation method of the turbine equipment consisting of a water supply system that feeds to the exhaust heat recovery boiler side, the flow of high-temperature high-pressure water supplied to the high-pressure drum of the high-pressure heating unit in the pressurizing unit is disturbed, and supersaturated dissolution oxidation It is in the operating method of the turbine installation characterized by operating while iron is particle-ized.

  In a sixteenth aspect based on the sixteenth aspect, when the supersaturated dissolved iron oxide is formed into particles, ammonia is locally injected into the high-temperature water supply, and operation is performed while iron oxide crystals are precipitated in the high-pressure water supply. There is a method of operating a turbine facility characterized in that.

  ADVANTAGE OF THE INVENTION According to this invention, adhesion of the scale in a high pressure water supply control valve reduces, and the frequency | count of a maintenance can be reduced.

  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 of a high-pressure water supply line having a scale generating / adhering device according to the present embodiment, and an outline of a portion of a high-pressure pressurizing unit 3 of a turbine equipment provided with an exhaust heat recovery boiler device according to the prior art shown in FIG. A schematic diagram is shown. 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. 6, the same code | symbol is attached | subjected and description is abbreviate | omitted.
As shown in FIG. 1, in a turbine facility having a high-pressure water supply line of a high-pressure pressurization unit, a high-temperature high-pressure water supply line LH that supplies high-temperature high-pressure water supply 101 supplied to a high-pressure drum 12 of a high-pressure heating unit in the pressurization unit. A scale generating / adhering device 60 is provided between the high pressure economizer 14 and the high pressure water supply control valve 50 to disturb the flow state of the high temperature high pressure water supply water 101 and generate and deposit iron oxide scales. It will be.

  In the scale generator / deposit device 60, the flow of the fluid of the high-temperature / high-pressure feed water 101 is changed to form a high flow rate portion and a stagnation portion, thereby actively promoting the generation / attachment of the iron oxide scale. . Thereby, even if a high flow velocity portion and a stagnation portion are present in the water supply control valve 50 provided on the downstream side of the scale generation / attachment device 60, the iron concentration in the fluid is reduced and the water supply Since the scale particles contained therein have grown to a sufficiently large size so as not to adhere to the wall surface, the scale adhesion to the water supply control valve is suppressed.

Further, as shown in FIGS. 2-1 and 2-2, in the first scale generation / attachment device 60-1 according to the present embodiment, a plurality of obstacles are formed along the flow direction of the high-temperature high-pressure water supply 101 therein. The plates 61 are arranged alternately.
Scale adhesion is promoted on the inner surface of the wall of the pipe where the baffle plate 61 is arranged, or in the fluid in the vicinity of the baffle plate 61, the scale particles grow on the wall surface of the stagnation portion on the rear stage, so that it is installed in the downstream. The scale adhesion to the valve body of the water supply control valve 50 is suppressed.

  This is because high temperature water supply collides with the alternately arranged baffle plates 61, so that there is a high possibility that fine particles or iron ions dissolved in the high temperature water supply precipitate as crystals. When the temperature after passing through the outlet of the charcoal unit 14 is 300 ° C. or higher and the iron solubility is lower than the saturation solubility as shown in FIG. This is because even if it exists, it tends to precipitate as crystals.

  For the above reason, the scale is prevented from adhering to the high temperature water supply control valve 50, and therefore, the increase in the opening of the high pressure water supply control valve 50 can be suppressed. As a result, the operation time can be extended, and the periodical inspection and valve maintenance can be performed at the same time. Thereby, the plant operating rate can be significantly improved.

  Here, the dimension (degree of shielding), shape, and thickness in the direction perpendicular to the flow direction of the baffle plate 61 can be set to arbitrary conditions so as to obtain an appropriate scale adhesion suppressing effect. Further, in order to obtain a higher scale adhesion suppressing effect, the shielding degree of the baffle plate 61 may be gradually increased toward the outlet rather than the inlet so that the high-temperature and high-pressure water supply collides one after another.

FIGS. 3A and 3B are schematic views of the second scale generation / attachment apparatus according to the present embodiment.
As shown in these drawings, in the second scale generation / attachment device 60-2 according to the present embodiment, a plurality of bamboo knot portions 62 having a hollow center along the flow direction of the high-temperature / high-pressure feed water 101 are disposed therein. I am trying to do it. The high temperature water supply collides with the plurality of centrally disposed bamboo knots 62 having a hollow center, so that there is a high possibility that fine particles or iron ions are precipitated as crystals. It is possible to suppress the precipitation of crystals even when passing through a plurality of holes of the high-pressure water supply control valve 50 by precipitating crystals actively in the front stage of the valve 50 to reduce the dissolution rate of iron in the high-temperature water supply water. it can.
Here, the dimension (shielding degree), shape, and thickness in the direction perpendicular to the flow direction of the bamboo joint portion 62 can be set to arbitrary conditions so as to obtain an appropriate scale adhesion suppressing effect. Further, in order to obtain a higher scale adhesion suppressing effect, the degree of shielding of the bamboo joint 62 may be gradually increased toward the outlet rather than the inlet so that the high-temperature and high-pressure water supply collides one after another.

FIGS. 4A and 4B are schematic views of a third scale generating / adhering apparatus according to the present embodiment.
As shown in these drawings, in the third scale generating / attaching apparatus 60-3 according to the present embodiment, a thread 63 which is a spiral portion is formed therein. When the high-temperature and high-pressure water supply 101 collides with the spiral threading 63, there is a high possibility that fine particles or iron ions are precipitated as crystals, and crystals are actively precipitated as in the first embodiment. Thus, the dissolution rate of iron in the high-temperature and high-pressure water supply 101 can be reduced, and even when passing through the plurality of holes of the high-pressure water supply control valve 50, precipitation as crystals can be suppressed.
Here, the interval, shape, and height of the thread of the thread cutting 63 can be set to arbitrary conditions so as to obtain an appropriate scale adhesion suppressing effect. Further, in order to obtain a higher scale adhesion suppression effect, the thread height of the thread 63 may be gradually increased from the inlet toward the outlet so that the high-temperature and high-pressure water supply collides one after another.

FIG. 5 is a schematic view of a high-pressure water supply line having a fourth scale generating / adhering device according to this embodiment.
As shown in FIG. 5, in this embodiment, in Example 1, ammonia 43a is not shown between the high-pressure economizer 14 and the scale generator / deposit device 60 so that the pH is 9.5 or higher. The iron ions supplied by the injection means and generated in the high pressure economizer 14 are positively precipitated as particles by raising the pH. The deposited particles pass through the hole of the valve, so there is no problem of scale adhesion.

In other words, the scale generator / attachment device 60 causes the scale to adhere to the barrier, and also changes the quality of the supplied water to positively form particles and make it manifest, thereby creating a high-pressure water supply on the downstream side. Adhesion due to the generation of scale at the orifice portion of the control valve 50 is prevented.
The ammonia may be injected in the scale generator / deposit device 60.

The ammonia 43a to be supplied is preferably injected so that the pH is 9.5 or higher, preferably 9.8 or higher, which is higher than the current pH value of 9.3.
In order to positively precipitate iron oxide particles between the high-pressure economizer 14 and the high-pressure feed water control valve 50, the pH 9.5 is 1.5 ppm, the pH 9.6 is 2.2 ppm, and the pH 9. It is necessary to inject about 5.0 ppm at 8 and about 12 ppm at pH 10.
In the drainage discharged from the plant, the pH may be adjusted separately so as to meet the drainage standard.

  The high-pressure feed water control valve according to the present invention is not particularly limited, but the high-pressure feed water control valve using the perforated plate single-stage feed water control valve or the perforated plate multi-stage feed water control valve shown in FIGS. This is particularly suitable for use in countermeasures.

  As described above, the turbine equipment of the present invention includes a steam turbine that is operated by steam generated through heating units having different pressures in a plurality of stages, a condenser that condenses the exhaust of the steam turbine, and a condensate. High temperature and high pressure for supplying high temperature and high pressure feed water to be supplied to the high pressure drum of the high pressure heating unit in the pressurization unit in a turbine facility comprising a water supply system for feeding the condensate condensed in the boiler to the exhaust heat recovery boiler side Provided between the high-pressure economizer 14 and the high-pressure water supply control valve 50 in the water supply line LH, is provided with a scale generator / attachment device that disturbs the flow of the high-temperature high-pressure water supply 101 and generates and adheres scale. Therefore, the suppression causes precipitation as a crystal state having a sufficiently large size that does not actively adhere to the wall surface, and this precipitation causes dissolution of iron in the high-temperature and high-pressure water supply 101. The adhesion of the scale in the high-pressure water supply control valve is reduced, and the number of maintenance can be reduced.

  In addition, since the heat from the heat source is a combined plant that is the exhaust of the gas turbine, the combined plant that combines the gas turbine and the steam turbine eliminates the problem of scale adhesion of the high-pressure feedwater control valve and continues for a long period of time. Driving.

  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. A high-temperature and high-pressure feed water that supplies high-temperature and high-pressure feed water to be supplied to a high-pressure drum of a high-pressure heating unit within the pressurizing unit in a waste heat recovery boiler apparatus that includes a heat recovery boiler and a water supply system that supplies water to the exhaust heat recovery boiler Since it is interposed between the high pressure economizer 14 and the high pressure water supply control valve 50 in the line LH, the scale generation / adhesion device for generating and adhering the scale is provided by disturbing the flow of the high temperature water supply inside. Due to the suppression, it will precipitate as a crystal state of a size that is sufficiently large that it will not actively adhere to the wall surface, and this precipitation will reduce the dissolution rate of iron in the high-temperature high-pressure feed water 101. As a result, scale adhesion on the high-pressure water supply control valve 50 is reduced, and the number of maintenance operations can be reduced.

  The water treatment method of the present invention includes a steam turbine that is operated by steam generated through a plurality of stages of different pressure units, a condenser that condenses the exhaust of the steam turbine, and a condenser that is condensed in the condenser. In the operation method of the turbine equipment comprising a water supply system for supplying water to the exhaust heat recovery boiler side, the flow of high-temperature high-pressure water supplied to the high-pressure drum of the high-pressure heating unit in the pressurization unit is disturbed, and Since the operation is performed while the dissolved iron oxide is made into particles, the dissolution rate of iron in the high-temperature water supply is reduced by precipitation, the adhesion of scale in the high-pressure water supply control valve is reduced, and the number of maintenance can be reduced.

  As described above, according to the present invention, scale adhesion in the high-pressure feed water control valve is reduced, the number of maintenance can be reduced, and continuous operation of the turbine equipment becomes possible.

1 is a schematic diagram of a high-pressure water supply line having a scale generation / adhesion device according to Embodiment 1. FIG. 1 is a schematic diagram of a first scale generation / attachment device according to Embodiment 1. FIG. 1 is a schematic diagram of a first scale generation / attachment device according to Embodiment 1. FIG. 6 is a schematic diagram of a second scale generating / adhering device according to Embodiment 2. FIG. 6 is a schematic diagram of a second scale generating / adhering device according to Embodiment 2. FIG. 6 is a schematic diagram of a third scale generating / adhering apparatus according to Embodiment 3. FIG. 6 is a schematic diagram of a third scale generating / adhering apparatus according to Embodiment 3. FIG. 6 is a schematic diagram of a high-pressure water supply line having a scale generation / attachment device according to Embodiment 4. FIG. It is a whole system schematic diagram of turbine equipment provided with a waste heat recovery boiler device. It is a schematic diagram of a perforated plate single-stage water supply control valve. It is a schematic diagram of a perforated plate multistage water supply control valve. It is a block diagram of the perforated plate which comprises a perforated plate multistage water supply control valve. FIG. 3 is a partially cutaway structural view of a perforated plate constituting a perforated plate multistage water supply control valve. It is a scale adhesion schematic diagram of a high-pressure water supply control valve. It is a related figure of water and iron solubility in pH9.3. It is a related figure of the plant operation time and feed water control valve opening degree in 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 14 High pressure economizer 45 Chemical injection means 46 Chemical 46a Ammonia 46b Hydrazine 50 High pressure water supply control valve 60 Scale generation / adhesion device 60-1 First scale generation / adhesion device 60-2 Second scale generation / adhesion device 60- 3 Third scale generator / attachment device 61 Baffle plate 62 Bamboo joint section hollow in center 63 Threading 100A Perforated plate single stage water supply control valve 100B Perforated plate multistage water supply control valve 101 High temperature / high pressure water supply 103 Orifice 104 Crystal (Fe3O4)

Claims (17)

A steam turbine that is activated by steam generated through heating units with different pressures in multiple stages, a condenser that condenses the exhaust of the steam turbine, and the condensate condensed in the condenser is placed on the exhaust heat recovery boiler side. In turbine equipment consisting of a feed water system
It is interposed between the high pressure economizer and the high pressure water supply control valve of the high temperature and high pressure water supply line that supplies the high temperature and high pressure feed water that is supplied to the high pressure drum of the high pressure heating unit in the pressurizing unit, and the flow of the high temperature water supply inside A turbine equipment comprising a scale generation / attachment device that disturbs the state and generates and attaches scale. In claim 1,
Turbine equipment characterized in that the scale generation / attachment device has a plurality of baffle plates arranged alternately along the flow direction of the high-temperature high-pressure feed water. In claim 1,
Turbine equipment characterized in that the scale generating / attaching device is provided with a plurality of bamboo joints having a hollow center in the flow direction of the high-temperature and high-pressure water supply. In claim 1,
A turbine facility characterized in that the scale generating / attaching device has a spiral portion formed therein. In any one of Claims 1 thru | or 4,
Turbine equipment in which ammonia is injected so as to have a pH of 9.5 or higher between the high pressure economizer and the scale generator / deposit device or in the scale generator / deposit device. In any one of Claims 1 thru | or 5,
The turbine equipment characterized in that the temperature of the high-pressure feed water supplied to the high-pressure drum is 250 ° C. or higher. In any one of Claims 1 thru | or 6,
The high-pressure water supply control valve is a perforated plate multi-stage water supply control valve. In any one of Claims 1 thru | or 7,
A turbine facility characterized in that the heat from the heat source is a combined plant that is exhaust of a gas turbine. An 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,
Among the pressurizing units, it is interposed between a high pressure economizer and a high pressure water supply control valve in a high temperature / high pressure water supply line for supplying high temperature / high pressure water supplied to the high pressure drum of the high pressure heating unit, and the flow of the high temperature water supply inside An exhaust heat recovery boiler apparatus comprising a scale generation / attachment device that disturbs the scale and generates and attaches scale. In claim 9,
The exhaust heat recovery boiler apparatus, wherein the scale generating / adhering device is formed by alternately arranging a plurality of baffle plates along a flow direction of the high-temperature high-pressure feed water. In claim 9,
A waste heat recovery boiler apparatus, wherein the scale generating / adhering device comprises a plurality of hollow bamboo knots along the flow direction of the high-temperature high-pressure feed water. In claim 9,
An exhaust heat recovery boiler apparatus, wherein the scale generation / attachment apparatus has a spiral portion formed therein. In any one of claims 9 to 12,
An exhaust heat recovery boiler apparatus, wherein ammonia is injected so as to have a pH of 9.6 or more between the high pressure economizer and the scale generation / deposition apparatus or in the scale generation / deposition apparatus. In any one of Claims 9 thru | or 13,
The exhaust heat recovery boiler apparatus, wherein a temperature of the high-pressure feed water supplied to the high-pressure drum is 250 ° C or higher. In any one of Claims 9 thru | or 14,
The exhaust heat recovery boiler apparatus, wherein the high-pressure feed water control valve is a perforated plate multi-stage feed water control valve. A steam turbine that is activated by steam generated through heating units with different pressures in multiple stages, a condenser that condenses the exhaust of the steam turbine, and the condensate condensed in the condenser is placed on the exhaust heat recovery boiler side. In the operation method of the turbine equipment consisting of the water supply system to supply,
An operation method for turbine equipment, wherein the operation is performed while disturbing the flow of high-temperature and high-pressure feed water supplied to the high-pressure drum of the high-pressure heating unit in the pressurization unit and granulating supersaturated dissolved iron oxide. In claim 16,
A method for operating a turbine facility, characterized in that when the supersaturated dissolved iron oxide is made into particles, ammonia is locally injected into the high-temperature feed water, and operation is performed while iron oxide crystals are precipitated in the high-pressure feed water.

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