JP5917348B2 - Water purification equipment with water purification equipment operation and power generation equipment - Google Patents

Description

  The present invention relates to an operation method of a water purification facility and a water purification facility provided with a power generation facility, and more particularly to an operation method and a water purification facility of a water purification facility provided with a gas turbine power generation facility.

  A water purification plant is a facility that removes solids such as earth and sand from raw water such as river water, disinfects it, and then sends it to a water distribution plant. Water purification plants need pump power to take water from rivers, power to stir, precipitate and filter water, power to send water to water distribution plants, power to treat sediment such as sludge It is. From the viewpoint of stably securing these powers, water purification plants equipped with power generation facilities are attracting attention.

  As an example which installs a gas engine or a gas turbine in a water purification plant, there exist some which were indicated by patent documents 1 and patent documents 2, for example. Moreover, in these patent documents 1 and patent documents 2, before inject | pouring the flocculant for precipitating a suspension, the waste water of a gas turbine is made to contact raw water, and pH of raw water is adjusted to the acid side. Proposed. As a result, the effect of the flocculant is enhanced, and there is an advantage that a conventionally used pH adjusting agent such as sulfuric acid becomes unnecessary. Further, by bringing the exhaust gas of the gas turbine into contact with the raw water, nitrogen oxides in the exhaust gas can be taken into the raw water, and there is an advantage that an apparatus for denitration is unnecessary or downsized.

JP 2004-66059 A JP 2005-54650 A

  The method proposed in Patent Document 1 and Patent Document 2 is to bring exhaust gas into direct contact with raw water of a water purification plant. For this reason, a power for injecting a large amount of exhaust gas into water and a reaction space for sufficient gas-liquid contact between the exhaust gas and raw water are required, and it is not easy to improve economy.

  An object of the present invention is to make it possible to easily use an acidic component derived from the operation of a power generation facility as a pH adjuster of water to be treated (raw water) of the water purification facility in a water purification facility provided with a power generation facility, thereby further improving economy. An object of the present invention is to provide a water purification facility equipped with an operation method of a water purification facility and a power generation facility.

The present invention relates to acidic water generated in the process of humidifying air between the intake of air to the compressor of a gas turbine and the supply of compressed air to the combustor, and the intake spray cooling that sprays water to the intake The drain water generated in the apparatus is used as a pH adjuster for water to be treated (raw water) of water purification equipment.

  ADVANTAGE OF THE INVENTION According to this invention, the acidic component derived from a power generation facility can be utilized easily as a pH adjuster of the to-be-processed water of a water purification facility, and the economical efficiency of a water purification facility can be improved more.

  Problems, configurations, and effects other than those described above will be clarified by the following description of embodiments.

The schematic system diagram which shows the water purification equipment provided with the power generation equipment which is one Example of this invention. The schematic system diagram which shows the water purification equipment provided with the power generation equipment which is the other Example of this invention. The schematic system diagram which shows the water purification equipment provided with the power generation equipment which is further another Example of this invention.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a schematic system diagram showing a configuration of a power generation facility provided with a power generation facility according to an embodiment of the present invention. The water purification facility 200 and the power generation facility 100 do not necessarily have to be located in the same site, but are connected to each other by pipes and configured to exchange water and exhaust gas. In the present embodiment, the power generated by the power generation facility 100 can be used by the water purification facility 200.

  In this embodiment, a high-humidity air-utilizing gas turbine power generation system is used as the power generation facility 100. As will be described in detail later, the use of a high-humidity air-utilizing gas turbine power generation system as a power generation facility attached to the water purification facility improves the economics of the water purification facility, and the high-humidity air-utilizing gas turbine power generation system itself. This is a characteristic configuration that can also improve economic efficiency.

  The main components of the gas turbine main body are a compressor 2 that compresses and discharges air, a combustor 4 that mixes and burns compressed air and fuel, and a turbine 1 that is driven by combustion gas generated by the combustor. . The shaft 5 that connects the compressor 2 and the turbine 1 is connected to a reduction gear and a generator (not shown), and can transmit the generated power to the system.

  The intake duct 3 of the compressor 2 is provided with an intake spray cooling device 14 that sprays water 94 on the atmosphere 93 to cool the air.

  In the path where the compressed air discharged from the compressor 2 reaches the combustor 4, an air cooler 21, an air cooler 21, and an economizer 16 that recovers heat by cooling the air that has become hot due to compression with circulating water. A humidifier (humidifier) 7 for humidifying the compressed air with the generated high-temperature circulating water and a regenerative heat exchanger 12 for heating the air humidified by the humidifier 7 are installed using the exhaust gas 13 as a heat source. 41, a pipe 42, a pipe 43, and a pipe 47.

  The humidifier 7 is a container containing a filling 72, and a liquid disperser (not shown) in which high-temperature circulating water generated by heat recovery by the air cooler 21 and the economizer 16 is installed above the filling 72. ), And the hot water flowing down the surface of the filling 72 and the air-liquid direct contact between the air flowing upward from the bottom of the filling 72 and the air is humidified. In the lower container 62 of the humidifier 7, water flowing down the surface of the filling 72 (water that has not evaporated by the humidifier) is collected, pressurized by the pump 63, and supplied to the economizer 16 via the pipe 34. In addition, water is supplied to the air cooler 21 via the pipe 33. The piping system is configured so that the circulating water heated and recovered by the economizer 16 or the air cooler 21 is supplied again to the liquid distributor above the filling 72 of the humidifier 7.

  The humidified compressed air is heated by the regenerative heat exchanger 12, and the heated humidified air is supplied to the combustor 4 and mixed with the fuel 95 to burn the fuel. The combustion gas generated by the combustor 4 drives the turbine 1 and is exhausted from the turbine 1 as exhaust gas 13. Further, the exhaust gas 13 from the turbine 1 is supplied to the water purification facility 200 via the regenerative heat exchanger 12 and the economizer 16, and the piping system is configured to be finally discharged from the stack 54.

  The water purification equipment 200 mixes flocculant 29 with a water intake process 23 in which raw water is taken from a water source such as a river or a dam, a receiving well 23 that is a storage tank that receives the raw water (treated water), and flocs. The floc formation process 24 for forming a large mass called a membrane filtration process 25 for filtering solid matter containing flocs by a filtration membrane, the distribution reservoir 26 for storing purified water sterilized by injecting chlorine 61 into the filtered water, and the distribution reservoir 26 It consists of a water supply process 27 that supplies purified water to a water demand area such as a business establishment or home by a pump. Further, the pH adjusting agent is injected into the raw water before the flocculant 29 is injected, and the pH of the raw water is adjusted.

  A characteristic configuration of the present embodiment is that an acidic component derived from the operation of the power generation facility is used as a pH adjuster. Conventionally, as an acidic component derived from the operation of a power generation facility, a component contained in exhaust gas is used, and the exhaust gas is directly used for pH adjustment. In the present embodiment, acidic water generated in the process of humidifying air between the intake of the atmosphere to the compressor of the gas turbine and the supply of compressed air to the combustor is used as a pH adjuster. That is, in this embodiment, the drain water generated from the intake spray cooling device 14 or the water collected in the lower container 62 of the humidifying device 7 (water that has not been evaporated by the humidifying device) is used as the pH adjusting agent. ing. As a specific component, a pipe 65 is provided as a drain water supply system that supplies the drain water generated by the intake spray cooling device 14 to the pH adjuster container 28 (pH adjuster supply device). A pipe 67 and a pipe 67 for introducing water from a pump 63 that pressurizes the water collected in the lower container 62 of the humidifier 7 as a water supply system for supplying water that has not evaporated in the humidifier 7 to the pH adjuster container 28. Is provided with a valve 66 installed in the middle. Further, a pipe 49 for supplying the pH adjusting agent in the pH adjusting agent container 28 to the landing well 23 is provided.

  Further, as another characteristic configuration of the present embodiment, a sludge treatment process 60 in which the exhaust gas 68 discharged from the economizer 16 is used as a heat source to remove moisture from the sludge generated in the membrane filtration process 25 and dry to reduce the volume. In addition, the purified water obtained by the water purification equipment is used as makeup water for the humidifying device 7 of the high-humidity air-utilizing gas turbine power generation system. As a purified water supply system that supplies purified water from the water purification facility to the humidifier 7, the pump 91 that pressurizes the purified water that has passed through the membrane filtration process 25, a desalinator 75, and a pipe 31 are provided. The purified water supply system is branched from downstream of the raw water filtration process of the water purification facility and upstream of the disinfection process.

  Next, operations of the water purification facility 200 and the power generation facility 100 according to the present embodiment will be described.

  In the power generation facility 100, the air 93 is sprayed as fine droplets by the intake spray cooling device 14 after dust and the like are removed by an intake filter (not shown) installed in the intake duct 3. The air 93 is cooled by evaporating a part of the water 94 inside the intake spray cooling device 14. Some of the fine droplets that have not evaporated are sucked into the compressor 2 along with the flow of the air 93. Another part of the fine droplets that have not evaporated collides with the wall surface or the like inside the intake duct 3 and is supplied as drain water to the pH adjuster container 28 via the pipe 65. At this time, the atmosphere 93 contains a small amount of sulfurous acid gas derived from the burning of fossil fuels on the earth, volcanic eruptions, etc., and these are absorbed by the water 94, which is fine droplets, and drained. Water contains a very small amount of sulfite ion. Accordingly, the drain water contains acidic components derived from the power generation equipment, and becomes acidic water generated in the process of humidifying the intake air to the compressor.

  When the temperature and pressure of the air rise in the process of being compressed by the compressor 2, the fine air droplets of the sprayed water 94 are evaporated, and the air is cooled by taking away the latent heat of evaporation. Since the volume of the compressed air is reduced by the cooling by the intake spray cooling device 14 and the compressor 2, the compression power of the compressor 2 is reduced, and the thermal efficiency of the gas turbine is improved.

  The compressed air discharged from the compressor 2 is cooled by the air cooler 21. The reason for cooling is to reduce the temperature of the water flowing down from the filling 72 of the humidifier 7 as much as possible, to lower the temperature of the water supply to the economizer 16, and to reduce the temperature of the exhaust gas 68 discharged from the economizer 16. This is to increase the amount of exhaust heat recovered as a system. The compressed air cooled by the air cooler 21 is supplied from the lower part of the filler 72 of the humidifier 7 through the pipe 42, and is sprayed from the upper part of the filler 72 and flows down on the surface of the filler 72. Repeated liquid contact and humidified until saturated water vapor pressure is reached. The flow rate of the hot water sprayed from above the filling 72 is reduced by the humidification, and the water that has not evaporated is collected in the lower container 62 of the humidifier 7.

  The water collected in the lower container 62 is pressurized by the pump 63, and part of the water is supplied to the economizer 16 via the pipe 34, heated by the exhaust gas 13 in the economizer 16, and again in the upper space of the humidifier 7. To the liquid distributor. On the other hand, another part of the water pressurized by the pump 63 is supplied to the air cooler 21 via the pipe 33 and is heated by the high-temperature discharge air of the compressor 2, so that the upper portion of the humidifying device 7 is again formed. It is supplied to the liquid distributor in the space. Still another part of the water pressurized by the pump 63 (a part of the circulating water) is supplied to the pH adjuster container 28 via the pipe 67 and the valve 66.

  In this humidifier 7, since the circulating water repeatedly makes gas-liquid contact with the air on the surface of the filling 72, a small amount of sulfurous acid gas contained in the air is absorbed, and sulfite ions accumulate in the water. . The concentration of this sulfite ion can be controlled by adjusting the amount of water extracted by adjusting the opening of the valve 66. In this embodiment, the pH adjuster container 28 is adjusted so that the hydrogen ion concentration pH is about 4. Therefore, part of the circulating water discharged from the humidifier (water that has not evaporated in the humidifier) contains acidic components derived from the power generation equipment, and is generated in the process of humidifying the compressed air supplied to the combustor. It becomes. In addition, since the amount of circulating water in the humidifier 7 is reduced by extracting water through the pipe 67, in this embodiment, clean water is supplied from the pipe 31 so that the water level of the lower container 62 becomes constant. I have control. Moreover, supplying clean water also means controlling the quality of the circulating water to be constant.

  The compressed air humidified by the humidifier 7 is heated by the exhaust gas 13 by the regenerative heat exchanger 12 and supplied to the combustor 4 from the pipe 47. In the combustor 4, the fuel 95 is combusted together with the humidified air to generate high-temperature combustion gas. This high-temperature combustion gas is supplied to the turbine 1 and passes through the stationary blade and the moving blade, whereby the thermal energy is converted into rotational kinetic energy through the expansion process of the Brayton cycle. The rotational kinetic energy is consumed to drive the compressor 2 connected to the same shaft, and is extracted as electric energy by a generator (not shown). At this time, since the humidified device 7 humidifies the compressed air, the mass flow rate of the fluid that drives the turbine 1 is higher than the mass flow rate of the fluid compressed by the compressor 2. More energy can be extracted compared to the turbine, which contributes to improved plant thermal efficiency.

  The exhaust gas 13 discharged through the expansion process in the turbine 1 is used by the regenerative heat exchanger 12 to heat the compressed air (humid compressed air) humidified by the humidifier. Further, the exhaust gas 13 discharged from the regenerative heat exchanger 12 is supplied to the economizer 16 and used to heat the circulating water of the humidifier 7 supplied from the pipe 34. The exhaust gas 68 discharged from the economizer 16 is guided to the sludge treatment process 60. In the sludge treatment process 60, the sludge is heated and dried using the exhaust gas 68 as a heat source. The dried sludge is discharged as soil. The exhaust gas 68 after drying the sludge is discharged from the stack 54 into the atmosphere.

  On the other hand, in the water purification facility 200, raw water is taken from a water source such as a river or a dam by a pump (not shown) in the water intake process 22, and the raw water is supplied to the landing well 23. In the landing well 23, the pH adjusting agent is injected from the pH adjusting agent container 28 prior to the injection of the flocculant 29 and the floc forming process 24. The pH adjuster is for adjusting to a hydrogen ion concentration (pH) condition in which the flocculant 29 acts efficiently. An acidic pH adjuster is injected when the raw water is more alkaline than the target pH condition, and an alkaline pH adjuster is injected when the raw water is acidic than the target condition. As the aggregating agent 29, what is called PAC (polyaluminum chloride) or a sulfuric acid band is generally used, and the aggregating effect can be most efficiently obtained around pH = 7. In recent years, eutrophication of river water and the like has progressed, and there are many cases where the pH of raw water is high. In that case, an acidic pH adjuster such as sulfuric acid is used. In the present embodiment, it is assumed that PAC is used as the flocculant 29 and an acidic pH adjuster is required, and pH = sulfuric acid ions supplied from the pipe 65 and the pipe 67 are used as the pH adjuster. Use about 4 acidic water. As a result, the drain water generated in the intake spray cooling device and the circulating water extracted for maintaining the water quality of the humidifying device 7 can be used effectively, and there is no need to procure a pH adjuster for the coagulation process of the water purification plant. Or it can reduce, and economical efficiency improves. In addition, in this embodiment, it is only necessary to provide a supply system for transferring drain water or circulating water generated in the high-humidity gas turbine power generation system to the pH adjuster container, so that it is necessary when exhaust gas is brought into direct contact with raw water. Large power and large equipment such as a power for injecting a large amount of exhaust gas into water and a reaction space for sufficient gas-liquid contact between the exhaust gas and raw water are unnecessary, and the economy is further improved.

  The raw water adjusted to around pH = 7 is injected with PAC, which is a flocculant 29, and forms flocs in the floc forming process 24. The solid matter containing floc is separated by the membrane filtration process 25, guided to the sludge treatment process 60, and processed into dry soil. A part of the filtered water is supplied to the desalinator 75 by the pump 91, removes impurity ions contained in the water, and is supplied to the humidifier 7. The reason why the impurity ions are removed here is to prevent impurities from being mixed into the air inside the humidifier and flowing into the gas turbine when the impurity ions are contained in the water supply of the humidifier. Under high temperature conditions in which a gas turbine operates, it is generally known that contaminants such as sodium and potassium corrode metal members of the gas turbine. An ion exchange resin, a reverse osmosis membrane, or the like can be used as a desalting apparatus. The remaining filtered water is sterilized and sterilized by injecting chlorine 61, and is then sent from the distribution reservoir 26 to a place where water is demanded such as a business establishment or a home by a pump (not shown) in the water supply process 27.

  Further, a conventionally proposed high-humidity air-utilizing gas turbine power generation system recovers moisture contained in the exhaust gas of the gas turbine in order to replenish water consumed for humidification by the humidifier 7. Needed to be installed. However, in this embodiment, water is supplied from the water purification facility 200 to the humidifier 7 through the pipe 31, so that the water recovery device is not required, and it is not necessary to dissipate the latent heat of condensation of the exhaust gas necessary for the operation of the water recovery device. It is possible to reduce the construction cost and operation cost of the high-humidity air-utilizing gas turbine power generation system of the power generation facility 100. From the viewpoint of the power generation equipment, this feature is advantageous in that the high-humidity air-utilizing gas turbine power generation system is provided with the water purification equipment to improve the economic efficiency of the high-humidity air-utilizing gas turbine power generation system itself. That's what it means. Therefore, from the viewpoint of power generation equipment, using drain water or circulating water as a pH adjuster is a secondary configuration.

  Moreover, since the sludge can be dried in the sludge treatment process 60 using the exhaust gas 68 of the gas turbine, the operating cost of the water purification facility 200 can be reduced.

  In addition, by making it possible to supply the power necessary for the operation of the water purification facility 200 from the power generation facility 100, it becomes possible to continuously operate the water purification facility 200 and supply water to the demand area even when the system power supply is abnormal. , Can improve the safety of social life infrastructure. In particular, in this example, a highly efficient gas turbine power generation system can be installed in a water purification plant by using a gas turbine power generation system using high humidity air as the power generation facility installed in the water purification plant. Independence can be further improved.

  In the above-described embodiment, an intake spray cooling device is provided as a gas turbine power generation system using high humidity air. Although the efficiency and output are reduced, the intake spray cooling device may be omitted, and only the humidification of the air by the humidifier may be used, and the circulating water of the humidifier may be used as the pH adjuster.

  A water purification facility equipped with a power generation facility according to another embodiment of the present invention will be described with reference to FIG.

  The water purification facility with the power generation facility of the present embodiment has the same basic configuration and operation as the water purification facility with the power generation facility of the first embodiment, so the description common to both will be omitted, and only the differences will be described below. explain.

  In this embodiment, the exhaust gas 13 discharged from the economizer 16 of the power generation facility 100 is supplied to the water recovery device 17 instead of the sludge treatment process 60. The water recovery device 17 condenses moisture contained in the exhaust gas 13 by direct gas-liquid contact between the water supplied from the spray nozzle installed inside the device and the exhaust gas 13 and recovers it in a recovery water container 18 in the lower space. It has a structure to do. Further, the water recovery device of this embodiment is a small one that recovers only a part of the amount of water replenished to the humidifying device 7, and the remaining portion of the water amount replenished to the humidifying device 7 is piped as in the first embodiment. It is piped to be supplied from the water purification facility 200 by 31. The exhaust gas after the moisture is recovered by the water recovery device 17 is configured to be discharged out of the system from the stack 54. Further, the recovered water in the recovered water container 18 is partly supplied by the pump 92 to the cooler 85, and after being cooled, is again supplied to the spray nozzle of the water recovery device 17 via the pipe 32. It has become. The remaining part of the recovered water sent out by the pump 92 is connected to the lower container 62 of the humidifier 7 by a pipe 69 and a pipe 70, and a valve 73 is installed in the pipe 70. The remaining part of the recovered water sent out by the pump 92 is connected to the pH adjuster container 28 via a pipe 69, a pipe 71 and a valve 74. The pipe 69, the pipe 71, and the valve 74 constitute a recovered water supply system.

  Next, operations unique to the present embodiment will be described.

  In the power generation facility 100, the exhaust gas 13 discharged from the economizer 16 is guided to the water recovery device 17. In the water recovery device 17, the circulating water supplied from the pipe 32 and sprayed from the spray nozzle and the exhaust gas 13 come into direct gas-liquid contact, and the moisture contained in the exhaust gas 13 is condensed and recovered in the recovery water container 18 in the lower space. The The exhaust gas 13 discharged from the water recovery device 17 is released from the stack 54 into the atmosphere. Since the recovered water in the recovered water container 18 is in direct contact with the exhaust gas of the gas turbine, it absorbs a small amount of nitrogen oxide, carbon dioxide, or sulfur oxide, which is a component of the combustion gas, depending on the type of fuel. It becomes acidic. Part of the recovered water in the recovered water container 18 is transferred to the cooler 85 by the pump 92, cooled by the cooler 85, and then supplied again from the pipe 32 to the spray nozzle of the water recovery device 17. The remaining part of the recovered water in the recovered water container 18 is supplied from the pipe 70 to the humidifier 7, and the humidifier 7 humidifies the air to replenish the consumed water. The remaining part of the recovered water in the recovered water container 18 is supplied from the pipe 71 to the pH adjuster container 28. The water level of the recovered water container 18 of the water recovery device 17 is the amount of water recovered by the condensation of the exhaust gas 13, the amount of water supplied from the pipe 70 to the humidifier 7, and the amount of water supplied from the pipe 71 to the pH adjuster container 28. It changes depending on the balance. Therefore, the water level that is insufficient is supplied by a water injection mechanism (not shown) so that the water level of the recovered water container 18 becomes constant, and the water level of the recovered water container 18 is maintained.

  Since the recovered water in the recovered water container 18 is acidic by absorbing the components of the combustion gas as described above, it is suitable as an acidic pH adjusting agent. That is, the recovered water is acidic water containing an acidic component derived from the operation of the power generation facility.

  According to this embodiment, by collecting moisture from the exhaust gas 13 and then replenishing the humidifier 7, the amount of water replenished from the water purification facility 200 to the humidifier 7 can be reduced, and the economic efficiency of the water purification facility 200 is improved. . Further, since the recovered water in the recovered water container 18 is acidic, it can be used as a pH adjuster for the raw water of the water purification facility 200, and more pH adjusters can be secured than in the case of the first embodiment. Therefore, the economical efficiency of the water purification facility 200 is improved. In addition, the recovery capability of the water recovery device 17 can be reduced and the capacity of the cooling equipment necessary for the operation of the water recovery device 17 can be reduced as compared with the conventionally proposed high-humidity air-utilizing gas turbine system. Therefore, it is possible to reduce the construction cost and operation cost of the high-humidity air-utilizing gas turbine system of the power generation facility 100. Furthermore, by making it possible to supply the power necessary for the operation of the water purification facility 200 from the power generation facility 100, it becomes possible to continuously operate the water purification facility 200 even when the system power supply is abnormal and to send water to the demand area. , Can improve the safety of social life infrastructure. Thus, also according to the present embodiment, it is possible to improve the energy independence of the water purification plant and provide the water purification plant with higher economic efficiency.

  A water purification facility provided with a power generation facility according to still another embodiment of the present invention will be described with reference to FIG.

  In this embodiment, the configuration of the power generation facility 100 is slightly different from the previous embodiment shown in FIG. 1 or FIG. 2, and a simple cycle gas turbine is the basic configuration.

  The gas turbine body includes a compressor 2 that compresses and discharges air, a combustor 4 that mixes and burns compressed air and fuel, and a turbine 1 that is driven by combustion gas generated by the combustor. The intake duct 3 of the compressor 2 is provided with an intake spray cooling device 14 that sprays water 94 on the atmosphere 93 to cool it. In the intake spray cooling device 14, the drain water generated when the spray water collides with the wall surface or the like is supplied to the storage tank 77, and the drain water collected in the storage tank 77 is pressurized by the pump 64 to the membrane separation device 76. A pipe 44 for supplying, a pipe 45 for supplying water from which impurities have been removed by the membrane separator 76 to the intake spray cooling device 14, and a pipe 46 for supplying impurities concentrated by the membrane separator 76 to the pH adjuster container 28 are provided. It has been.

  Although the basic structure of the water purification plant 200 is similar to that of the first embodiment shown in FIG. 1, the membrane filtration process 25 on the downstream side of the flock formation process 24 includes a sedimentation process 19 using a sedimentation basin and a filtration basin 20. It is composed of a combination of

  Next, operations unique to the present embodiment will be described.

  In the power generation facility 100, the air 93 is sprayed as fine droplets by the intake spray cooling device 14 after dust and the like are removed by an intake filter (not shown) installed in the intake duct 3. The air 93 is cooled by evaporating a part of the water 94 inside the intake spray cooling device 14. Some of the fine droplets that have not evaporated are sucked into the compressor 2 along with the flow of the air 93. Another part of the fine droplets that have not evaporated collides with the wall surface or the like inside the intake duct 3 and is supplied to the storage tank 77 through the pipe 65 as drain water. At this time, the atmosphere 93 contains a small amount of sulfurous acid gas derived from the burning of fossil fuels on the earth, volcanic eruptions, etc., and is absorbed by the water 94, which is fine droplets, into the drain water. Contains trace amounts of sulfite ions. When the temperature and pressure of the air rise in the process of being compressed by the compressor 2, the fine air droplets of the sprayed water 94 are evaporated, and the air is cooled by taking away the latent heat of evaporation. Since the volume of the compressed air is reduced by the cooling by the intake spray cooling device 14 and the compressor 2, the compression power of the compressor 2 is reduced, and the thermal efficiency of the gas turbine is improved. The compressed air discharged from the compressor 2 is supplied to the combustor 4 from a pipe 47 inside the gas turbine. In the combustor 4, the fuel 95 is combusted together with the compressed air to generate high-temperature combustion gas. This high-temperature combustion gas is supplied to the turbine 1, heat energy is converted into rotational kinetic energy, and finally, it is taken out as electric energy as in the first embodiment. The exhaust gas 13 discharged through the expansion process in the turbine 1 is guided to the sludge treatment process 60 and used for sludge drying, as in the first embodiment described with reference to FIG.

  The drain water collected in the storage tank 77 is supplied to the membrane separation device 76. The membrane separation device 76 is composed of a reverse osmosis membrane, and impurity ions such as sulfurous acid contained in the drain water are concentrated and supplied to the pH adjuster container 28 through the pipe 46. The water from which the impurity ions have been removed by the membrane separator 76 is supplied again to the intake spray cooling device 14 through the pipe 45 and used for intake spray. Since the amount of water used for the intake spray is insufficient only with the drain water collected via the pipe 65, the shortage is supplied from the water purification equipment 200 by the pump 91 and the pipe 31.

  In the present embodiment, the drain water containing a small amount of sulfite ions generated in the intake spray cooling device 14 is separated by the membrane separation device 76, so that the concentrated sulfite ions can be used as a pH adjuster of the water purification equipment 200. Therefore, it is possible to eliminate or reduce the external procurement of the pH adjuster, and the economic efficiency of the water purification facility 200 is improved. Further, the combination of the purified water from which the solids are removed from the water purification equipment 200 and the membrane separation device 76 sufficiently removes the solids and impurity ions of the water supplied to the intake spray cooling device 14. Compared with the installation of the pure water production apparatus in the power generation facility 100, the construction cost and the operation cost of the power generation facility 100 are improved.

  On the other hand, in the water purification equipment 200, until the floc is formed in the floc forming process 24, it is the same as that of the first embodiment. However, in this embodiment, most of the solid matter including the floc is put into the sedimentation tank by the precipitation process 19. Precipitate. Suspensions and organic matter that have not settled in the sedimentation basin are filtered by the sand or gravel layer in the filtration basin 20 and are sent to the distribution reservoir 26. In the membrane filtration process 25 illustrated in FIG. 1 and FIG. 2, the power of the pump is necessary to supply raw water to the fine membrane at a high pressure. However, in this embodiment, it is not necessary to pressurize the water. There is an advantage that energy required for operation of the water purification facility 200 can be reduced. However, the sedimentation basin of the sedimentation process 19 and the area of the filtration basin 20 are required to be large, and the location conditions of the water purification facility 200 are limited.

  In addition, this invention is not limited to an above-described Example, Various modifications are included. For example, the above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described. Further, a part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment. Moreover, it is possible to add, delete, and replace other configurations for a part of the configuration of each embodiment.

  1: turbine, 2: compressor, 3: intake duct, 4: combustor, 5: shaft, 7: humidifier, 12: regenerative heat exchanger, 13: exhaust gas, 14: intake spray cooling device, 16: economizer 17: Water recovery device, 18: Recovery water container, 19: Precipitation process, 20: Filtration pond, 21: Air cooler, 22: Water intake process, 23: Receiving well, 24: Flock formation process, 25: Membrane filtration process , 26: distributing reservoir, 27: water supply process, 28: pH adjusting agent container, 29: flocculant, 31, 32, 33, 34, 41, 42, 43, 44, 45, 46, 47, 48, 49: piping 53: heat transfer pipe, 54: stack, 55: sludge, 56: dry sludge, 57: heat exchanger, 60: sludge treatment process, 61: chlorine, 62: lower container, 63, 64: pump, 65: piping, 66: valve, 67: piping, 68: exhaust gas, 69, 7 71: piping, 72: packing, 73, 74: valve, 75: demineralizer, 76: membrane separator, 77: storage tank, 85: cooler, 91, 92: pump, 93: air, 94: water , 95: fuel, 100: power generation equipment, 200: water purification equipment.

Claims (9)

It is an operation method of a water purification facility in which a pH adjusting agent is injected into treated water of the water purification facility, and then a condensing agent is injected.
Acidic water generated in the process of humidifying air between the intake of the atmosphere to the compressor of the gas turbine and the supply of compressed air to the combustor is used as the pH adjusting agent.
The gas turbine includes an intake spray cooling device that sprays water to the intake air, and the acidic water generated in the process of humidifying the air is drain water generated in the intake spray cooling device. How to operate the equipment. 2. The method of operating a water purification facility according to claim 1 , wherein the acidic water generated in the process of humidifying the air is concentrated water obtained by concentrating impurity components of the drain water. According to claim 1, wherein the gas turbine further comprises a humidifying device for humidifying the compressed air from the compressor, the acidic water generated in the process of humidifying the air, the unevaporated with humidifier water A method for operating a water purification facility, comprising: 4. The humidifier according to claim 3 , wherein the humidifier is configured to humidify the compressed air while circulating the water that has not evaporated, and the acidic water generated in the process of humidifying the air is partially discharged from the humidifier. A method for operating a water purification facility characterized by including circulating water. The gas turbine according to claim 1, further comprising a water recovery device that recovers moisture from the gas turbine exhaust gas , and further using recovered water obtained by the water recovery device as the pH adjuster. How to operate the water purification equipment. A water purification facility with a power generation facility,
The power generation facility includes: a compressor that compresses air; a humidifier that humidifies air compressed by the compressor; a combustor that is supplied with air and fuel humidified by the humidifier and generates combustion gas; A high-humidity air-utilizing gas turbine generator comprising a turbine that is rotated by combustion gas from the combustor and generates motive energy, and a regenerative heat exchanger that heats air humidified by the humidifier by the exhaust gas of the turbine System,
The pH adjuster supply device to the water to be treated of the water purification equipment includes a water supply system that supplies water that has not evaporated in the humidifier,
The power generation facility includes an intake spray cooling device that sprays water on the intake air of the compressor, and the water purification facility supplies drain water supply that supplies drain water generated by the intake spray cooling device to the pH adjuster supply device. Water purification facilities with power generation facilities characterized by having a system. 7. The power generation facility according to claim 6 , wherein the power generation facility includes a water recovery device that recovers moisture from the exhaust gas of the turbine, and the water purification facility supplies the recovered water recovered by the water recovery device to the pH adjuster supply device. A water purification facility with a power generation facility characterized by a recovery water supply system. 7. The water purification facility with a power generation facility according to claim 6 , further comprising a purified water supply system that supplies purified water obtained by the water purification facility to the humidifier. 9. The water purification facility according to claim 8 , wherein the water purification supply system is branched from the downstream of the raw water filtration process and the upstream of the disinfection process of the water purification facility.

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