CN116621309A - Device system and method for oxidation treatment of water supply of waste heat boiler of gas turbine - Google Patents
Device system and method for oxidation treatment of water supply of waste heat boiler of gas turbine Download PDFInfo
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- CN116621309A CN116621309A CN202310802202.7A CN202310802202A CN116621309A CN 116621309 A CN116621309 A CN 116621309A CN 202310802202 A CN202310802202 A CN 202310802202A CN 116621309 A CN116621309 A CN 116621309A
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- water
- demineralized water
- dissolved oxygen
- pipeline
- conveying device
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 393
- 238000000034 method Methods 0.000 title claims abstract description 39
- 239000002918 waste heat Substances 0.000 title claims abstract description 33
- 239000007789 gas Substances 0.000 title claims abstract description 25
- 230000003647 oxidation Effects 0.000 title abstract description 12
- 238000007254 oxidation reaction Methods 0.000 title abstract description 12
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 129
- 239000001301 oxygen Substances 0.000 claims abstract description 129
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 129
- 230000001105 regulatory effect Effects 0.000 claims description 54
- 238000002955 isolation Methods 0.000 claims description 37
- 238000005259 measurement Methods 0.000 claims description 14
- 230000001590 oxidative effect Effects 0.000 claims 1
- 238000011033 desalting Methods 0.000 abstract description 19
- 238000005260 corrosion Methods 0.000 abstract description 17
- 230000007797 corrosion Effects 0.000 abstract description 17
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 abstract description 14
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 abstract description 12
- 229910021529 ammonia Inorganic materials 0.000 abstract description 6
- 230000007613 environmental effect Effects 0.000 abstract description 6
- 239000010865 sewage Substances 0.000 abstract description 6
- 238000002485 combustion reaction Methods 0.000 abstract description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 24
- 238000006213 oxygenation reaction Methods 0.000 description 16
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 10
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 8
- 238000010438 heat treatment Methods 0.000 description 8
- 229910052742 iron Inorganic materials 0.000 description 8
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 6
- 235000011114 ammonium hydroxide Nutrition 0.000 description 6
- 230000001276 controlling effect Effects 0.000 description 6
- 230000001133 acceleration Effects 0.000 description 5
- 229910052757 nitrogen Inorganic materials 0.000 description 5
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 4
- 238000002161 passivation Methods 0.000 description 4
- 229920006395 saturated elastomer Polymers 0.000 description 4
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 3
- 239000003546 flue gas Substances 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000008021 deposition Effects 0.000 description 2
- 230000036541 health Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 238000004176 ammonification Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000010612 desalination reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000001172 regenerating effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/008—Control or steering systems not provided for elsewhere in subclass C02F
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/002—Construction details of the apparatus
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/06—Controlling or monitoring parameters in water treatment pH
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/22—O2
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/08—Corrosion inhibition
Abstract
The invention relates to a device system and a method for oxidation treatment of water supply of a waste heat boiler of a gas turbine, wherein the device system comprises a desalting water tank, a desalting water conveying device, a first desalting water adding pipeline, a second desalting water adding pipeline and a third desalting water adding pipeline which are connected with the desalting water tank, and the three desalting water adding pipelines are respectively connected with an inlet of the condensed water conveying device, a low-pressure evaporator and a low-pressure steam drum. The device system provided by the invention adopts desalted water to feed water and add oxygen, so that the problem of accelerated corrosion of a low-pressure water feeding system of a waste heat boiler of a combustion engine is avoided; in addition, ammonia is not required to be added, so that the ammonia nitrogen content in the steam water is reduced, and the quality requirements of industries such as food, pharmacy and the like can be met; simultaneously, the treatment difficulty and the environmental protection pressure of the sewage are also lightened.
Description
Technical Field
The invention belongs to the technical field of energy application, relates to a device system of a gas turbine waste heat boiler, and particularly relates to a device system and a method for oxidation treatment of water supply of the gas turbine waste heat boiler.
Background
At present, main methods for treating the water fed to the waste heat boiler of the gas turbine comprise a reduction volatilization treatment (AVT (R)) and a total volatility treatment (AVT (O)), and the total volatility treatment method is most widely used.
The total volatility treatment is to add ammonia water into the water supply, and adjust the pH value of the water supply to 9.4-9.8. The feed water ammonification point of the full volatile treatment is usually set to be two points, wherein the first point is usually set at an outlet pipeline of a condensate pump, and the second point is usually set at an inlet pipeline of the feed water pump, and the method relieves the corrosion efficiency of the low-pressure feed water system by improving the pH value of the feed water system.
Moreover, even if the pH value of the feed water reaches 9.4-9.8 by adding ammonia water, fe with poor stability can be formed on the surface of the heating pipeline 3 O 4 A passivation film which can alleviate or inhibit corrosion problems of pipelines of high and low pressure water supply systems, economizers, low and high pressure evaporators and the like to a certain extent, but due to Fe 3 O 4 The compactness of the passivation film of the water supply can still reach 2-10 mug/L.
For example, CN115773492a discloses a wet nitrogen charging maintenance method for quick start of a waste heat boiler of a gas turbine, comprising: closing each isolation valve; the pH value of the liquid in the deoxidized water tank is improved; continuously monitoring the water supply by using a water supply dissolved oxygen on-line instrument; after the pressure of the high-pressure steam drum and the low-pressure steam drum is reduced below a threshold value, ammonia adding operation is carried out on the steam drum, forced circulation is carried out during ammonia adding, and the pH value of liquid in the high-pressure steam drum and the low-pressure steam drum is improved; starting a nitrogen making machine, starting nitrogen supply valves of all systems, monitoring the pressure of a steam drum, adjusting the power of the nitrogen making machine in time, and maintaining the pressure in the steam drum; the temperature of the steam drum is further reduced, the deoxidizing water tank is opened, and the power of the nitrogen making machine is adjusted to maintain the pressure while the liquid level of the steam drum is maintained.
CN106382619a discloses a gas boiler preheating degree of depth recovery system, including steam turbine, deaerator, boiler, flue gas waste heat exchanger and chimney, be connected through the condensate line between steam turbine and the deaerator, the deaerator still is connected with demineralized water supply line, and flue gas waste heat exchanger can give the demineralized water in the demineralized water supply line and the condensate water in the condensate line with the heat transfer of flue gas. The boiler smoke exhaust temperature is reduced, a steam turbine water supply regenerative system is optimized, the smoke waste heat is utilized to the maximum extent, and the steam turbine hydrothermal extraction quantity is reduced.
In the prior art, the treatment method of the water supply of the waste heat boiler of the gas turbine is total volatilization treatment (AVT (O)), the pH value of the water supply is controlled to be 9.4-9.8 by adding ammonia water into the water supply, the ammonia adding point is usually two points, the first point is arranged at the outlet end of the condensed water conveying device, and the other end is arranged at the inlet end of the water supply conveying device. However, when the pH value of the water supply is controlled to be more than 9.6, the concentration of ammonia water in the water supply is required to exceed 2150 mug/L, and the ammonia nitrogen content in steam exceeds 1000 mug/L when the gas phase and the liquid phase are separated due to the fact that the ammonia water is easy to volatilize, so that the requirement of industries such as food, pharmacy and the like on low concentration of the ammonia nitrogen in the steam cannot be met. If the pH value is reduced by reducing the ammonia addition amount of the water, the method requirement of the thermodynamic equipment cannot be met.
In addition, even if the ammonia addition amount of the water is kept to enable the pH value of the water to be 9.4-9.8, the problem that the total iron content in a steam-water system is 2-10 mug/L still exists, which indicates that the low-pressure water supply pipeline still has serious flow corrosion problem at the moment; because the ammonia nitrogen content in the steam water is large, the ammonia nitrogen content of the drainage of the steam drum is higher, the drainage difficulty is increased, and the risk of environmental pollution is high.
Therefore, there is a need for a device system for oxidation treatment of water fed to a waste heat boiler of a gas turbine that solves the problem of flow accelerated corrosion of a low pressure water feed line.
Disclosure of Invention
The invention aims to provide a device system and a method for oxidation treatment of water supply of a waste heat boiler of a gas turbine, wherein the device system and the method can be used forForming compact Fe on heating surface 2 O 3 The oxide film controls the iron content in the steam water to be below 1 mug/L, thereby playing the roles of preventing flow acceleration corrosion and thermal equipment corrosion; in addition, as no extra ammonia water is needed, the ammonia nitrogen content in the steam water is reduced, the steam water not only meets the steam supply quality requirements of the industries such as food, pharmacy and the like, but also reduces the treatment difficulty and the environmental protection pressure of the sewage discharged by the power plant.
In order to achieve the aim of the invention, the invention adopts the following technical scheme:
in a first aspect, the invention provides a method for oxidation treatment of water fed to a waste heat boiler of a gas turbine, comprising the following steps:
adding oxygen-containing desalted water to the inlet end of the condensate pump to ensure that the concentration of dissolved oxygen in the condensate water output by the outlet end of the condensate pump is 50-60 mug/L;
the pH value of the condensed water is less than or equal to 9.
The method provided by the invention can increase the dissolved oxygen concentration in the condensed water output by the outlet end of the condensed water pump by about 40 mug/L by adding oxygen-containing demineralized water at the inlet end of the condensed water pump, and can increase the dissolved oxygen concentration to 50-60 mug/L by adding 10-20 mug/L of the background of the condensed water, for example, 50 mug/L, 51 mug/L, 52 mug/L, 53 mug/L, 54 mug/L, 55 mug/L, 56 mug/L, 58 mug/L or 60 mug/L, but the method is not limited to the listed values, and other values not listed in the numerical range are applicable.
The method provided by the invention can prevent the corrosion condition of low-pressure water supply of the waste heat boiler of the gas turbine, and the pH value of the condensed water used by the method can be below 9 due to the increase of the concentration of dissolved oxygen, and at the moment, compact Fe can still be formed on the heating surface of the pipeline 2 O 3 The oxide film can well prevent flow acceleration corrosion, the iron content can be controlled below 1 mug/L, and the corrosion phenomenon of thermal equipment is prevented.
Because the pH value of the condensed water can be below 9, the method provided by the invention reduces the ammonia nitrogen consumption, avoids the transition volatilization of ammonia nitrogen, and enables the steam-water to meet the steam supply requirements of the industries such as food, pharmacy and the like; meanwhile, the difficulty in treating the sewage of the power plant and the environmental protection pressure are also reduced.
Preferably, the method further comprises:
the oxygen-containing demineralized water is added to the downfall of the low-pressure evaporator so that the concentration of dissolved oxygen in the feed water is 35 to 45. Mu.g/L, for example, 35. Mu.g/L, 36. Mu.g/L, 38. Mu.g/L, 40. Mu.g/L, 42. Mu.g/L or 45. Mu.g/L, but the present invention is not limited to the above-mentioned values, and other values not shown in the numerical range are applicable.
The invention adds oxygen-containing desalted water into the descending pipeline of the low-pressure evaporator to ensure that the concentration of the dissolved oxygen in the outlet water of the low-pressure steam drum is 35-45 mug/L, thereby meeting DL/T805.1-2021, part 1 of steam-water chemistry guidance of thermal power plant: the technical requirements of boiler water supply oxygenation treatment guidelines.
Preferably, the method further comprises:
the oxygen-containing demineralized water is added to the connection pipeline between the low-pressure evaporator and the economizer, so that the water supply dissolved oxygen concentration at the inlet end of the economizer is 35-45 mug/L, for example, 35 mug/L, 36 mug/L, 38 mug/L, 40 mug/L, 42 mug/L or 45 mug/L, but the oxygen-containing demineralized water is not limited to the recited values, and other values not recited in the numerical range are applicable.
The invention adds oxygen-containing desalted water into the connecting pipeline of the low-pressure evaporator and the economizer, so that the dissolved oxygen concentration at the inlet of the economizer is 35-45 mug/L, and the DL/T805.1-2021 part 1 of steam-water chemistry guidance of a thermal power plant is satisfied: the technical requirements of boiler water supply oxygenation treatment guidelines.
Preferably, the pH value of the oxygen-containing demineralized water is 6.5-7.0, and the concentration of dissolved oxygen is 7500-8500 mug/L.
The pH of the oxygen-containing demineralized water supplemented according to the invention is from 6.5 to 7.0, for example, 6.5, 6.6, 6.7, 6.8, 6.9 or 7, but is not limited to the values recited, but other values not recited in the range of values are equally applicable.
The oxygen-containing demineralized water to be supplemented according to the present invention may have a dissolved oxygen concentration of 7500 to 8500. Mu.g/L, for example, 7500. Mu.g/L, 7800. Mu.g/L, 8000. Mu.g/L, 8200. Mu.g/L or 8500. Mu.g/L, but is not limited to the values recited, and other values not recited in the numerical range are equally applicable.
In a second aspect, the present invention provides a device system for use in the method of the first aspect. The device system provided by the second aspect of the invention is an improvement on the prior water supply device system of the waste heat boiler of the gas turbine, and the traditional water supply device system of the waste heat boiler comprises a desalting water tank which is used for storing desalting water;
the feeding port of the demineralized water conveying device is connected with the demineralized water tank and is used for conveying the demineralized water in the demineralized water tank;
the traditional waste heat boiler water supply device system also comprises a condenser, a condensed water conveying device, a low-pressure steam drum, a water supply conveying device, an economizer and a high-pressure steam drum;
the desalting water tank, the desalting water conveying device, the condenser, the condensed water conveying device, the low-pressure steam drum, the water supply conveying device and the economizer are sequentially connected with the high-pressure steam drum.
The low-pressure steam drum is connected with the low-pressure evaporator through a descending pipeline; the air outlet pipeline of the low-pressure steam drum is connected with the low-pressure cylinder;
the high-pressure steam drum is connected with the high-pressure evaporator through a descending pipeline; the air outlet pipeline of the high-pressure steam drum is connected with the high-pressure cylinder.
In particular, the system of devices according to the second aspect of the invention comprises a desalinated water tank for storing desalinated water;
the feeding port of the demineralized water conveying device is connected with the demineralized water tank and is used for conveying the demineralized water in the demineralized water tank;
one end of the first demineralized water adding pipeline is connected with a discharge port of the demineralized water conveying device, and the other end of the first demineralized water adding pipeline is connected with an inlet of the condensate water conveying device;
one end of the second demineralized water adding pipeline is connected with a discharge port of the demineralized water conveying device, and the other end of the second demineralized water adding pipeline is connected with a descending pipeline of the low-pressure evaporator;
and one end of the third demineralized water adding pipeline is connected with a discharge port of the demineralized water conveying device, and the other end of the third demineralized water adding pipeline is connected with an inlet pipeline of the economizer.
The device system provided by the invention is characterized in that the demineralized water in the demineralized water tank is conveyed to different positions of the waste heat boiler system of the combustion engine through the arrangement of the first demineralized water adding pipeline, the second demineralized water adding pipeline and the third demineralized water adding pipeline, so that the content of dissolved oxygen in the soda water can be controlled to be about 40 mug/L, and when the pH value of the soda water is about 9, compact Fe can be formed on a heating surface 2 O 3 Oxidation film, thus preventing flow acceleration corrosion, and further controlling the iron content in the steam-water to be 1 mug/L; the ammonia nitrogen in the soda water is reduced according to the amount, so that the soda water can meet the steam supply quality requirements of the industries such as food, pharmacy and the like; meanwhile, the sewage treatment difficulty and the environmental protection pressure of the power plant can be reduced.
In addition, the device system provided by the invention does not need to use external high-pressure oxygen supply sources, so that the cost consumption is reduced; the replacement of the oxygen cylinder is not needed, so that the maintenance workload and the labor cost are reduced; in addition, compared with the traditional high-pressure oxygenation method, the device system provided by the invention has the advantages that the sample adding system is simple, and the use of a high-pressure container and dangerous chemicals is avoided.
Illustratively, the demineralized water delivery apparatus of the present invention includes, but is not limited to, a demineralized water delivery pump.
The invention combines the characteristic that the saturated dissolved oxygen-enriched desalted water needs to be supplemented when the waste heat boiler of the gas turbine is in normal operation, optimally adjusts the adding position of the desalted water, and realizes the increase of the oxygen content in the water supply, thereby forming compact Fe on the surface of a low-pressure water supply pipeline 2 O 3 The passivation film reduces the total iron content in the water supply to below 1 mug/L, effectively solves the problem of flow accelerated corrosion of a low-pressure water supply pipeline, and achieves the purposes of reducing the deposition rate of iron oxide on a heating surface of a boiler and prolonging the service life of the boiler. The pH value can be greatly reduced by the water supply oxygenation treatment while the safety and health level of the thermodynamic equipment is improved, the ammonia nitrogen content in the steam can be obviously reduced, and the requirements of partial steam users are met.
Under the conditions of 20 ℃ and 100kPa, the content of natural saturated dissolved oxygen of desalted water is about 8mg/L, the desalted water is fed into a condenser when a gas turbine waste heat boiler normally operates, and most of the dissolved oxygen in the desalted water is discharged into the atmosphere through vacuumizing, so that the oxygen content of the condensate water is about 10-20 mug/L. Through the arrangement of the second desalted water adding pipeline and the third desalted water adding pipeline, the dissolved oxygen in the water supply of the inlet of the economizer and the low-pressure evaporator reaches 40 mug/L, and the technical requirements of DL/T805.1-2021, part 1 of steam-water chemistry guidance rule of thermal power plant, namely the boiler water supply oxygenation treatment guidance rule, are met.
Preferably, the first demineralized water adding pipeline is provided with a pressurizing branch;
the pressurizing branch is provided with a pressurizing conveying device.
According to the invention, through the arrangement of the pressurizing branch and the pressurizing conveying device, the input pressure of the oxygen-containing desalted water can be increased as required.
Preferably, the second demineralized water adding pipeline is provided with a metering and conveying device.
Preferably, the third demineralized water adding pipeline is provided with a pressurizing and conveying device.
Preferably, in the pressurization branch, the inlet end and the outlet end of the pressurization conveying device are respectively provided with a first front isolation valve and a first rear isolation valve.
The arrangement of the first front isolation valve and the first rear isolation valve can isolate the thermodynamic system when the pressurizing conveying device in the pressurizing branch fails.
Preferably, the first demineralized water adding pipeline is provided with a first regulating valve.
The setting of the first regulating valve can adjust the flow of the desalted water flowing into the condensate conveying device from the first desalted water adding pipeline according to the opening degree of the valve of the first regulating valve, so as to adjust the concentration of dissolved oxygen in the effluent of the condensate conveying device.
According to the invention, through the arrangement of the flow measuring device and the first regulating valve, an operator can conveniently regulate the flow of the desalted water in the first desalted water adding pipeline, so that the concentration of dissolved oxygen of the condensed water is conveniently controlled to be 50-60 mug/L.
Preferably, along the conveying direction of the desalted water, the second desalted water adding pipeline is sequentially provided with a second front isolation valve, a metering conveying device, a second rear isolation valve and a second regulating valve.
The arrangement of the second front isolation valve and the second rear isolation valve can enable the pressurizing and conveying device in the second desalted water adding pipeline to play a role in isolating the thermodynamic system when the pressurizing and conveying device fails.
The setting of the second regulating valve can adjust the flow of desalted water in the second desalted water adding pipeline according to the opening degree of the second regulating valve, thereby adjusting the concentration of dissolved oxygen in the effluent of the low-pressure evaporator.
The invention is convenient for operators to adjust the flow of the desalted water in the second desalted water adding pipeline by setting the second regulating valve, thereby being convenient for controlling the content of the dissolved oxygen in the water supply of the low-pressure evaporator to be more than 40 mug/L so as to meet the technical requirements of DL/T805.1-2021 part 1 of the steam-water chemistry guide rule of the thermal power plant, namely the boiler water-supply oxygenation treatment guide rule.
Preferably, along the conveying direction of the desalted water, the third desalted water adding pipeline is sequentially provided with a third front isolation valve, a pressurizing conveying device, a second rear isolation valve and a third regulating valve.
The third front isolation valve and the third rear isolation valve can be arranged to isolate the thermodynamic system when the pressurizing and conveying device in the third desalted water adding pipeline fails.
The third regulating valve is arranged to regulate the flow of desalted water in the third desalted water adding pipeline according to the opening degree of the third regulating valve, so that the concentration of dissolved oxygen in water at the inlet of the economizer is regulated.
The invention is convenient for operators to adjust the flow of the desalted water in the third desalted water adding pipeline by setting the third regulating valve, thereby being convenient for controlling the content of the dissolved oxygen at the inlet of the economizer to be more than 40 mug/L so as to meet the technical requirements of DL/T805.1-2021, part 1 of the steam-water chemistry guidance rule of the thermal power plant, namely the boiler water-feeding oxygenation treatment guidance rule.
The first demineralized water adding pipeline, the second demineralized water adding pipeline and the third demineralized water adding pipeline are respectively and independently provided with the flow rate measuring device and the pressure measuring device, the flow rate measuring device and the pressure measuring device are not particularly limited, and a person skilled in the art can reasonably set the flow rate measuring device and the pressure measuring device according to the flow rate measuring needs.
Preferably, a first dissolved oxygen measuring device is arranged at the water outlet pipeline of the desalted water conveying device;
and adjusting the valve opening of the first regulating valve according to the measurement result of the first dissolved oxygen measuring device.
Preferably, the descending pipeline of the low-pressure evaporator is provided with a second dissolved oxygen measuring device;
and adjusting the valve opening of the second regulating valve according to the measurement result of the second dissolved oxygen measuring device.
Preferably, a third dissolved oxygen measuring device is arranged on the inlet pipeline of the economizer;
and adjusting the valve opening of the third regulating valve according to the measurement result of the third dissolved oxygen measuring device.
According to the invention, the opening of the valve is regulated through the first regulating valve, the second regulating valve and the third regulating valve, so that the desalination water quantity of the adding point is controlled, and the water vapor dissolved oxygen of the adding point reaches a required value. As a further preferable technical scheme, the device system further comprises a DCS control system; the DCS control system adjusts the valve opening of the first regulating valve, the second regulating valve and the third regulating valve according to the input signals of the first dissolved oxygen measuring device, the second dissolved oxygen measuring device and the third dissolved oxygen measuring device and preset process values, so that the concentration of the dissolved oxygen in the condensed water reaches 50-60 mug/L, and the dissolved oxygen in the water supply of the economizer inlet and the low-pressure evaporator reaches 40 mug/L.
Compared with the prior art, the invention has the following beneficial effects:
the invention adjusts the adding port of the demineralized water, especially through the arrangement of the first demineralized water adding pipeline, the dissolved oxygen of the condensed water can be increased by more than 40 mug/L, and the dissolved oxygen amount of 10-20 mug/L of the condensed water is added, so that the dissolved oxygen concentration of the condensed water reaches 50-60 mug/L; through the arrangement of the second desalted water adding pipeline and the third desalted water adding pipeline, the dissolved oxygen in the water supply of the inlet of the economizer and the low-pressure evaporator reaches 40 mug/L, and the technical requirements of DL/T805.1-2021, part 1 of steam-water chemistry guidance rule of thermal power plant, namely the boiler water supply oxygenation treatment guidance rule, are met.
Drawings
FIG. 1 is a schematic diagram of a device system according to the present invention;
wherein: 1, a desalting water tank; 2, a desalted water conveying device; 3, a condenser; 4, a condensed water conveying device; 5, a low-pressure steam drum; 6, a low-pressure evaporator; 7, a water supply conveying device; 8, a coal economizer; 9, a high-pressure steam drum; 10, a high-pressure evaporator; 11, a pressurizing and conveying device; 12, metering and conveying device.
Detailed Description
The technical scheme of the invention is further described by the following specific embodiments. It will be apparent to those skilled in the art that the examples are merely to aid in understanding the invention and are not to be construed as a specific limitation thereof.
An embodiment of the invention provides a method for oxidation treatment of water fed to a waste heat boiler of a gas turbine, which comprises the following steps:
adding oxygen-containing desalted water to the inlet end of the condensate pump to ensure that the concentration of dissolved oxygen in the condensate water output by the outlet end of the condensate pump is 50-60 mug/L;
the pH value of the condensed water is less than or equal to 9.
The method provided by the invention can increase the dissolved oxygen concentration in the condensed water output by the outlet end of the condensed water pump by about 40 mug/L by adding oxygen-containing demineralized water at the inlet end of the condensed water pump, and can increase the dissolved oxygen concentration to 50-60 mug/L by adding 10-20 mug/L of the background of the condensed water, for example, 50 mug/L, 51 mug/L, 52 mug/L, 53 mug/L, 54 mug/L, 55 mug/L, 56 mug/L, 58 mug/L or 60 mug/L, but the method is not limited to the listed values, and other values not listed in the numerical range are applicable.
The method provided by the invention can prevent the corrosion condition of low-pressure water supply of the waste heat boiler of the gas turbine, and the pH value of the condensed water used by the method can be below 9 due to the increase of the concentration of dissolved oxygen, and at the moment, compact Fe can still be formed on the heating surface of the pipeline 2 O 3 The oxide film can well prevent flow acceleration corrosion, the iron content can be controlled below 1 mug/L, and the corrosion phenomenon of thermal equipment is prevented.
Because the pH value of the condensed water can be below 9, the method provided by the invention reduces the ammonia nitrogen consumption, avoids the transition volatilization of ammonia nitrogen, and enables the steam-water to meet the steam supply requirements of the industries such as video, pharmacy and the like; meanwhile, the difficulty in electric field sewage treatment and the environmental protection pressure are also reduced.
In certain embodiments, the method further comprises:
the oxygen-containing demineralized water is added to the downfall of the low-pressure evaporator so that the concentration of dissolved oxygen in the feed water is 35 to 45. Mu.g/L, for example, 35. Mu.g/L, 36. Mu.g/L, 38. Mu.g/L, 40. Mu.g/L, 42. Mu.g/L or 45. Mu.g/L, but the present invention is not limited to the above-mentioned values, and other values not shown in the numerical range are applicable.
The invention adds oxygen-containing desalted water into the descending pipeline of the low-pressure evaporator to ensure that the concentration of the dissolved oxygen in the outlet water of the low-pressure steam drum is 35-45 mug/L, thereby meeting DL/T805.1-2021, part 1 of steam-water chemistry guidance of thermal power plant: the technical requirements of boiler water supply oxygenation treatment guidelines.
In certain embodiments, the method further comprises:
the oxygen-containing demineralized water is added to the connection pipeline between the low-pressure evaporator and the economizer, so that the water supply dissolved oxygen concentration at the inlet end of the economizer is 35-45 mug/L, for example, 35 mug/L, 36 mug/L, 38 mug/L, 40 mug/L, 42 mug/L or 45 mug/L, but the oxygen-containing demineralized water is not limited to the recited values, and other values not recited in the numerical range are applicable.
The invention adds oxygen-containing desalted water into the connecting pipeline of the low-pressure evaporator and the economizer, so that the dissolved oxygen concentration at the inlet of the economizer is 35-45 mug/L, and the DL/T805.1-2021 part 1 of steam-water chemistry guidance of a thermal power plant is satisfied: the technical requirements of boiler water supply oxygenation treatment guidelines.
In certain embodiments, the oxygen-containing desalted water has a pH of 6.5 to 7.0 and a dissolved oxygen concentration of 7500 to 8500 μg/L.
An embodiment of the invention provides a device system for oxidation treatment of water supply of a waste heat boiler of a gas turbine, as shown in fig. 1, wherein the device system is an improvement of the water supply device system of the prior waste heat boiler of the gas turbine, and the water supply device system of the conventional waste heat boiler comprises a desalting water tank 1, and the desalting water tank 1 is used for storing desalted water;
the demineralized water conveying device 2 is connected with the demineralized water tank 1 at a feed inlet of the demineralized water conveying device 2 and is used for conveying the demineralized water in the demineralized water tank 1;
the traditional waste heat boiler water supply device system also comprises a condenser 3, a condensed water conveying device 4, a low-pressure steam drum 5, a water supply conveying device 7, an economizer 8 and a high-pressure steam drum 9;
the desalting water tank 1, the desalting water conveying device 2, the condenser 3, the condensed water conveying device 4, the low-pressure steam drum 5, the water supply conveying device 7 and the economizer 8 are sequentially connected with the high-pressure steam drum 9.
The low-pressure steam drum 5 is connected with the low-pressure evaporator 6 through a descending pipeline; the air outlet pipeline of the low-pressure steam drum 5 is connected with the low-pressure cylinder;
the high-pressure steam drum 9 is connected with the high-pressure evaporator 10 through a descending pipeline; the air outlet pipeline of the high-pressure steam drum 9 is connected with the high-pressure cylinder.
Specifically, the device system according to the second aspect of the present invention comprises a desalted water tank 1, wherein the desalted water tank 1 is used for storing desalted water;
the demineralized water conveying device 2 is connected with the demineralized water tank 1 at a feed inlet of the demineralized water conveying device 2 and is used for conveying the demineralized water in the demineralized water tank 1;
one end of the first demineralized water adding pipeline is connected with a discharge port of the demineralized water conveying device 2, and the other end of the first demineralized water adding pipeline is connected with an inlet of the condensate water conveying device 4;
one end of the second demineralized water adding pipeline is connected with a discharge port of the demineralized water conveying device 2, and the other end of the second demineralized water adding pipeline is connected with a descending pipeline of the low-pressure evaporator 6;
and one end of the third demineralized water adding pipeline is connected with a discharge port of the demineralized water conveying device 2, and the other end of the third demineralized water adding pipeline is connected with an inlet pipeline of the economizer 8.
The device system provided by the invention is characterized in that the demineralized water in the demineralized water tank 1 is conveyed to different positions of the waste heat boiler system of the combustion engine through the arrangement of the first demineralized water adding pipeline, the second demineralized water adding pipeline and the third demineralized water adding pipeline, so that the content of dissolved oxygen in the soda water can be controlled to be about 40 mug/L, and when the pH value of the soda water is about 9, compact Fe can be formed on a heating surface 2 O 3 Oxidation film, thus preventing flow acceleration corrosion, and further controlling the iron content in the steam-water to be 1 mug/L; the ammonia nitrogen in the soda water is reduced according to the amount, so that the soda water can meet the steam supply quality requirements of the industries such as food, pharmacy and the like; meanwhile, the sewage treatment difficulty and the environmental protection pressure of the power plant can be reduced.
In addition, the device system provided by the invention does not need to use external high-pressure oxygen supply sources, so that the cost consumption is reduced; the replacement of the oxygen cylinder is not needed, so that the maintenance workload and the labor cost are reduced; in addition, compared with the traditional high-pressure oxygenation method, the device system provided by the invention has the advantages that the sample adding system is simple, and the use of a high-pressure container and dangerous chemicals is avoided.
In certain embodiments, the first, second, and third demineralized water addition lines are connected in parallel.
Illustratively, the demineralized water delivery apparatus 2 of the present invention includes, but is not limited to, a demineralized water delivery pump.
The invention combines the characteristic that the saturated dissolved oxygen-enriched desalted water needs to be supplemented when the waste heat boiler of the gas turbine is in normal operation, optimally adjusts the adding position of the desalted water, and realizes the increase of the oxygen content in the water supply, thereby forming compact Fe on the surface of a low-pressure water supply pipeline 2 O 3 The passivation film reduces the total iron content in the water supply to below 1 mug/L, effectively solves the flow accelerated corrosion problem of the low-pressure water supply pipeline, reduces the deposition rate of iron oxide on the heating surface of the boiler and prolongs the service life of the boilerIs a target of (a). The pH value can be greatly reduced by the water supply oxygenation treatment while the safety and health level of the thermodynamic equipment is improved, the ammonia nitrogen content in the steam can be obviously reduced, and the requirements of partial steam users are met.
Under the conditions of 20 ℃ and 100kPa, the content of natural saturated dissolved oxygen of desalted water is about 8mg/L, the desalted water is fed into a condenser 3 when a gas turbine waste heat boiler normally operates, and most of the dissolved oxygen in the desalted water is discharged into the atmosphere through vacuumizing, so that the oxygen content of the condensate water is about 10-20 mug/L. Through the arrangement of the second desalted water adding pipeline and the third desalted water adding pipeline, the dissolved oxygen in the water supply of the inlet of the economizer 8 and the low-pressure evaporator 6 reaches 40 mug/L, and the technical requirements of DL/T805.1-2021, part 1 of steam-water chemistry guidance rules of thermal power plants, namely the boiler water supply oxygenation treatment guidance rules, are met.
In certain embodiments, the first desalinated water adding pipeline is provided with a pressurizing branch;
the supercharging branch is provided with a supercharging conveying device 11.
The invention can increase the input pressure of oxygen-containing demineralized water according to the need by arranging the pressurizing branch and the pressurizing conveying device 11.
In certain embodiments, the second desalinated water addition line is provided with a metering delivery device 12.
In certain embodiments, the third desalinated water adding pipeline is provided with a pressurizing and conveying device 11.
In some embodiments, the inlet end and the outlet end of the boost conveying device 11 are respectively provided with a first front isolation valve and a first rear isolation valve in the boost branch.
The arrangement of the first front isolation valve and the first rear isolation valve can isolate the thermodynamic system when the pressurizing conveying device 11 in the pressurizing branch fails.
In certain embodiments, the first desalinated water adding line is provided with a first regulating valve.
The setting of the first regulating valve can adjust the flow of the desalted water flowing into the condensate conveying device 4 from the first desalted water adding pipeline according to the opening degree of the first regulating valve, so as to adjust the concentration of the dissolved oxygen in the effluent of the condensate conveying device 4.
According to the invention, through the arrangement of the flow measuring device and the first regulating valve, an operator can conveniently regulate the flow of the desalted water in the first desalted water adding pipeline, so that the concentration of dissolved oxygen of the condensed water is conveniently controlled to be 50-60 mug/L.
In certain embodiments, the second desalinated water adding pipe is provided with a second front isolation valve, a metering delivery device 12, a second rear isolation valve, and a second regulating valve in this order along the direction of delivery of the desalinated water.
The arrangement of the second front isolation valve and the second rear isolation valve can isolate the thermodynamic system when the pressurizing and conveying device 11 in the second desalted water adding pipeline fails.
The second regulating valve is arranged to regulate the flow of desalted water in the second desalted water adding pipeline according to the opening degree of the second regulating valve, so as to regulate the concentration of dissolved oxygen in the water discharged from the low-pressure evaporator 6.
The invention is convenient for operators to adjust the flow of the desalted water in the second desalted water adding pipeline by setting the second regulating valve, thereby being convenient for controlling the content of the dissolved oxygen in the water supply of the low-pressure evaporator 6 to be more than 40 mug/L so as to meet the technical requirements of DL/T805.1-2021, part 1 of the steam-water chemistry guide rule of the thermal power plant, namely the boiler water supply oxygenation treatment guide rule.
In some embodiments, the third demineralized water adding pipeline is provided with a third front isolation valve, a booster conveying device 11, a second rear isolation valve and a third regulating valve in sequence along the conveying direction of the demineralized water.
The third front isolation valve and the third rear isolation valve can isolate the thermodynamic system when the pressurizing and conveying device 11 in the third desalted water adding pipeline fails.
The third regulating valve is arranged to regulate the flow of desalted water in the third desalted water adding pipeline according to the opening of the third regulating valve, so as to regulate the concentration of dissolved oxygen in water at the inlet of the economizer 8.
The invention is convenient for operators to adjust the flow of the desalted water in the third desalted water adding pipeline by setting the third regulating valve, thereby being convenient for controlling the content of the dissolved oxygen at the inlet of the economizer 8 to be more than 40 mug/L so as to meet the technical requirements of DL/T805.1-2021, part 1 of the steam-water chemistry guidance rule of the thermal power plant, namely the boiler water-feeding oxygenation treatment guidance rule.
The first demineralized water adding pipeline, the second demineralized water adding pipeline and the third demineralized water adding pipeline are respectively and independently provided with the flow rate measuring device and the pressure measuring device, the flow rate measuring device and the pressure measuring device are not particularly limited, and a person skilled in the art can reasonably set the flow rate measuring device and the pressure measuring device according to the flow rate measuring needs.
In some embodiments, a first dissolved oxygen measuring device is arranged at the water outlet pipeline of the desalted water conveying device 2;
and adjusting the valve opening of the first regulating valve according to the measurement result of the first dissolved oxygen measuring device.
In certain embodiments, the descending line of the low pressure evaporator 6 is provided with second dissolved oxygen measuring means;
and adjusting the valve opening of the second regulating valve according to the measurement result of the second dissolved oxygen measuring device.
In certain embodiments, the inlet line of the economizer 8 is provided with a third dissolved oxygen measuring device;
and adjusting the valve opening of the third regulating valve according to the measurement result of the third dissolved oxygen measuring device.
In certain embodiments, the device system further comprises a DCS control system; the DCS control system adjusts the valve opening of the first regulating valve, the second regulating valve and the third regulating valve according to the input signals of the first dissolved oxygen measuring device, the second dissolved oxygen measuring device and the third dissolved oxygen measuring device and preset process values, so that the concentration of the dissolved oxygen in the condensed water reaches 50-60 mug/L, and the dissolved oxygen in the water supply of the inlet of the economizer 8 and the low-pressure evaporator 6 reaches 40 mug/L.
Example 1
The embodiment provides a device system for oxidation treatment of water supply of a waste heat boiler of a gas turbine, which comprises a desalting water tank, wherein the desalting water tank is used for storing desalting water;
the feeding port of the demineralized water conveying device is connected with the demineralized water tank and is used for conveying the demineralized water in the demineralized water tank; the demineralized water conveying device is a demineralized water conveying pump;
one end of the first demineralized water adding pipeline is connected with a discharge port of the demineralized water conveying device, and the other end of the first demineralized water adding pipeline is connected with an inlet of the condensate water conveying device;
one end of the second demineralized water adding pipeline is connected with a discharge port of the demineralized water conveying device, and the other end of the second demineralized water adding pipeline is connected with a descending pipe of the low-pressure evaporator;
and one end of the third demineralized water adding pipeline is connected with a discharge port of the demineralized water conveying device, and the other end of the third demineralized water adding pipeline is connected with an inlet pipeline of the economizer.
The first desalted water adding pipeline is provided with a pressurizing branch; the pressurizing branch is provided with a pressurizing conveying device. In the pressurizing branch, the inlet end and the outlet end of the pressurizing conveying device are respectively provided with a first front isolation valve and a first rear isolation valve. The first demineralized water adding pipeline is provided with a first regulating valve.
The second demineralized water adding pipeline is sequentially provided with a second front isolation valve, a metering and conveying device, a second rear isolation valve and a second regulating valve.
The third demineralized water adding pipeline is sequentially provided with a third front isolation valve, a pressurizing and conveying device, a second rear isolation valve and a third regulating valve.
A first dissolved oxygen measuring device is arranged at the water outlet pipeline of the desalted water conveying device; and adjusting the valve opening of the first regulating valve according to the measurement result of the first dissolved oxygen measuring device.
The descending pipeline of the low-pressure evaporator is provided with a second dissolved oxygen measuring device; and adjusting the valve opening of the second regulating valve according to the measurement result of the second dissolved oxygen measuring device.
A third dissolved oxygen measuring device is arranged on an inlet pipeline of the economizer; and adjusting the valve opening of the third regulating valve according to the measurement result of the third dissolved oxygen measuring device.
The device system also comprises a DCS control system; the DCS control system adjusts the valve opening of the first regulating valve, the second regulating valve and the third regulating valve according to the input signals of the first dissolved oxygen measuring device, the second dissolved oxygen measuring device and the third dissolved oxygen measuring device and preset process values, so that when oxygen-containing desalted water with the pH value of 6.5-7 and the dissolved oxygen concentration of 7500-8500 mug/L is used for treatment, the dissolved oxygen concentration of condensed water reaches 50-60 mug/L, and the dissolved oxygen in the water supply of an economizer inlet and a low-pressure evaporator reaches 40 mug/L.
In summary, the invention adjusts the adding port of the demineralized water, especially through the arrangement of the first demineralized water adding pipeline, the dissolved oxygen of the condensed water can be increased by more than 40 mug/L, and the dissolved oxygen amount of 10-20 mug/L of the condensed water is added, so that the dissolved oxygen concentration of the condensed water reaches 50-60 mug/L; through the arrangement of the second desalted water adding pipeline and the third desalted water adding pipeline, the dissolved oxygen in the water supply of the inlet of the economizer and the low-pressure evaporator reaches 40 mug/L, and the technical requirements of DL/T805.1-2021, part 1 of steam-water chemistry guidance rule of thermal power plant, namely the boiler water supply oxygenation treatment guidance rule, are met.
The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and it should be apparent to those skilled in the art that any changes or substitutions that fall within the technical scope of the present invention disclosed herein are within the scope of the present invention.
Claims (10)
1. The method for oxidizing the feed water of the waste heat boiler of the gas turbine is characterized by comprising the following steps of:
adding oxygen-containing desalted water to the inlet end of the condensate pump to ensure that the concentration of dissolved oxygen in the condensate water output by the outlet end of the condensate pump is 50-60 mug/L;
the pH value of the condensed water is less than or equal to 9.
2. The method according to claim 1, wherein the method further comprises:
adding oxygen-containing desalted water into the descending pipeline of the low-pressure evaporator to ensure that the concentration of dissolved oxygen in the water supply is 35-45 mug/L;
preferably, the method further comprises:
adding oxygen-containing desalted water to the connecting pipeline between the low pressure evaporator and the economizer to make the water supply dissolved oxygen concentration at the inlet end of the economizer be 35-45 mug/L;
preferably, the pH value of the oxygen-containing demineralized water is 6.5-7, and the dissolved oxygen concentration is 7500-8500 mug/L.
3. A plant system for use in the method of claim 1 or 2, characterized in that the plant system comprises a desalinated water tank for storing desalinated water;
the feeding port of the demineralized water conveying device is connected with the demineralized water tank and is used for conveying the demineralized water in the demineralized water tank;
one end of the first demineralized water adding pipeline is connected with a discharge port of the demineralized water conveying device, and the other end of the first demineralized water adding pipeline is connected with an inlet of the condensate water conveying device;
one end of the second demineralized water adding pipeline is connected with a discharge port of the demineralized water conveying device, and the other end of the second demineralized water adding pipeline is connected with a descending pipeline of the low-pressure evaporator;
and one end of the third demineralized water adding pipeline is connected with a discharge port of the demineralized water conveying device, and the other end of the third demineralized water adding pipeline is connected with an inlet pipeline of the economizer.
4. A plant system according to claim 3, characterized in that the first desalinated water adding line is provided with a pressurizing branch;
the pressurizing branch is provided with a pressurizing conveying device;
preferably, the second demineralized water adding pipeline is provided with a metering and conveying device;
preferably, the third demineralized water adding pipeline is provided with a pressurizing and conveying device.
5. The system of claim 4, wherein the pressurization branch is provided with a first front isolation valve and a first rear isolation valve at an inlet end and an outlet end of the pressurization conveying device, respectively;
preferably, the first demineralized water adding pipeline is provided with a first regulating valve.
6. The system of claim 4 or 5, wherein the second desalinated water addition line is provided with a second front isolation valve, a metering delivery device, a second rear isolation valve, and a second regulator valve in that order along the direction of delivery of the desalinated water.
7. The system of any of claims 4-6, wherein the third desalinated water addition line is provided with a third front isolation valve, a booster delivery device, a second rear isolation valve, and a third regulator valve in that order along the direction of delivery of desalinated water.
8. The system of any one of claims 5-7, wherein a first dissolved oxygen measurement device is provided at an outlet line of the demineralized water delivery device;
and adjusting the valve opening of the first regulating valve according to the measurement result of the first dissolved oxygen measuring device.
9. The system of claim 6, wherein the low pressure evaporator drop line is provided with a second dissolved oxygen measurement device;
and adjusting the valve opening of the second regulating valve according to the measurement result of the second dissolved oxygen measuring device.
10. The plant arrangement according to claim 7, characterized in that the inlet line of the economizer is provided with a third dissolved oxygen measuring device;
and adjusting the valve opening of the third regulating valve according to the measurement result of the third dissolved oxygen measuring device.
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| CN202310802202.7A CN116621309A (en) | 2023-06-30 | 2023-06-30 | Device system and method for oxidation treatment of water supply of waste heat boiler of gas turbine |
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| CN202310802202.7A CN116621309A (en) | 2023-06-30 | 2023-06-30 | Device system and method for oxidation treatment of water supply of waste heat boiler of gas turbine |
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