JPWO2012008013A1 - Concentration plant, concentrated water production power plant, concentration method, and operation method of concentrated water production plant - Google Patents

Abstract

By combining a demineralizer using a membrane method and a concentrating device using an evaporation method, water containing salt such as accompanying water is stably concentrated at a low equipment cost, and separated into fresh water and salts. The accompanying water 20 is pretreated water 21 after the solid and soluble substances are removed by the pretreatment facility 3. The pretreated water 21 flows into the reverse osmosis membrane concentration equipment 4 and is separated into permeated water 22 and membrane concentrated water 24. The permeated water 22 is used as fresh water. The membrane concentrated water 24 flows into the precipitation unit 10 and an insoluble component is precipitated by mixing the alkali agent, and then flows into the storage tank 5 together with the pretreatment waste water 23 from the pretreatment device 3 to evaporate and concentrate the feed water. 25, further flows into the evaporative concentration facility 6 and is separated into condensed water 26 and evaporated concentrated water 27. The condensed water 26 is used as fresh water. The evaporated concentrated water 27 is stored in the concentrated water tank 7. The evaporative concentration facility 6 performs concentration using the steam generated by the exhaust heat recovery boiler 2 as a heat source.

Description

  The present invention relates to a concentrating plant and a concentrating method for separating raw water such as brine and seawater, in particular accompanying water discharged from a coal seam together with coal seam gas into fresh water and salt solids, and a concentrated water production system comprising the concentrating plant. The present invention relates to a plant and an operation method thereof.

  In recent years, utilization of coal bed gas (hereinafter referred to as CBM) containing methane, which is secondarily discharged from the coal bed during coal mining, has been advanced. According to Non-Patent Document 1, water in the coal seam (hereinafter referred to as accompanying water) is discharged with CBM collection. In many cases, the accompanying water is brine containing salt, and it is necessary to press into the formation again or to separate the salts by desalting and return to the soil. As the amount of accompanying water also fluctuates with the change in the amount of CBM collected, the treatment capacity of the accompanying water is a limiting condition for increasing the amount of collected CBM. Currently, in many CBM production facilities, the accompanying water is stored in a pond and removed by natural evaporation to remove water and concentrate and separate the salt as solid matter.

  As a general salt concentration / separation method, there is an evaporation concentration method such as a multi-effect evaporator described in Patent Document 1.

  On the other hand, in recent years, with the expansion of water shortage, efforts have been made to produce and use fresh water by desalting the accompanying water. According to Non-Patent Document 2, as a main desalting method, a membrane method for separating salts with a reverse osmosis membrane or an ion exchange membrane, an evaporation method for condensing moisture evaporated by heating, and the like have been studied. According to Non-Patent Document 3, there is a case where fresh water is produced from accompanying water by a two-stage reverse osmosis membrane treatment.

Moreover, in the field of seawater desalination, there is a method called a hybrid method that combines a reverse osmosis membrane and an evaporation method in order to improve water production efficiency. In Patent Document 2, in a pretreatment device, salt water is filtered through a first-stage nanofiltration membrane unit to reduce the ion content including scale components, and then supplied to a reverse osmosis membrane device to supply filtered water (fresh water). As well as
Wastewater that does not permeate the first stage nanofiltration membrane unit is further supplied to the second stage filtration membrane unit and the concentrated water is discharged out of the system, while the second stage nanofiltration water is supplied to the desalination apparatus of the evaporation method. In addition, fresh water is produced with high efficiency while suppressing the precipitation of scale components. Concentrated water separated by the reverse osmosis membrane device is discharged through a valve or supplied to a desalination device of an evaporation method together with second-stage nanofiltration water to generate fresh water.

JP 2004-41850 A JP 2008-1000021 A

Shigeki Sakamoto, Yasunobu Ohno, Oil and Natural Gas Review, Vol. 42, No. 6, p 31-49 (2008) James R Kuipers et al, Coal Bed Methane-Produced Water: Management Options for Substainable Development, pages 52-58, August 2004 James Welch, the edition of OIL & GAS JOURNAL, October 5 (2009)

  As a method for treating the accompanying water (brine containing salt) discharged with CBM collection, the evaporating pond system described in Non-Patent Document 1 is currently being implemented in many CBM production facilities. A vast site is required.

  As described in Patent Document 1, Non-Patent Document 2, and Non-Patent Document 3, as a treatment method that replaces the evaporating pond method, a film method and an evaporation method have been studied and partially implemented. In particular, in Non-Patent Document 3, the accompanying water is concentrated by a two-stage reverse osmosis membrane treatment to reduce the volume. In this case, the volume of the concentrated water after separating the fresh water is reduced to about 1/10 of the supplied accompanying water, and the volume of the evaporation pond for separating salt from the concentrated water can also be reduced to 1/10. It is. However, even if the volume is reduced, there is no change in the need for an evaporating pond for solidifying and separating the salts. For this reason, there are problems of high facility costs and restrictions on location conditions due to the large installation area of the evaporation pond. In addition, when the evaporative concentration apparatus is used, the equipment capacity can be greatly reduced as compared with the evaporating pond, but a heat source for heating is necessary, and the operating cost is increased.

  In Patent Document 2, a reverse osmosis membrane and an evaporation method are combined in order to improve water production efficiency. However, a part of pretreatment wastewater (second-stage filtration membrane unit concentrated water), and in some cases, a reverse osmosis membrane device When the concentrated water separated in (1) is discarded to the outside, and this is applied to the treatment of accompanying water, an evaporation pond for solidifying and separating the salts is also required.

  The object of the present invention is to solve the above-mentioned conventional problems, and by concentrating water containing salts such as associated water stably at low equipment cost by combining a demineralizer by a membrane method and a concentrator by an evaporation method. And providing a concentration plant and a concentration method for separating into fresh water and salts.

  In order to achieve the above object, the present invention provides a concentrating device, a reverse osmosis membrane device for separating accompanying water discharged together with coal bed gas from a coal bed into permeated water and non-permeated water, And an evaporating and concentrating device for discharging concentrated water to the storage facility.

  Moreover, this invention for achieving the said objective is a pretreatment apparatus which pre-processes raw | natural water in a concentration apparatus, and isolate | separates the water after the pre-treatment which passed through this pre-treatment apparatus into permeated water and non-permeated water. A reverse osmosis membrane device, a pretreatment waste water generated in the pretreatment device, and an evaporative concentration device that generates concentrated water by concentrating the non-permeated water generated in the reverse osmosis membrane device.

  By placing the reverse osmosis membrane device in the preceding stage and the evaporating and concentrating device in the subsequent stage in this way, the concentration and volume reduction of the raw water (associated water) can be achieved by combining the preceding stage and the subsequent stage. As a result, after the concentrated water is once stored in the storage facility, the concentrated water can be evaporated to dryness. When the concentrated water is evaporated to dryness, the evaporation pond is unnecessary and the installation cost of the evaporation pond becomes zero. . Even when an evaporation pond is provided, the installation area of the evaporation pond is significantly reduced, and the installation cost of the evaporation pond can be reduced.

  Thus, by taking the configuration of the present invention, the site for the associated water treatment facility in the CBM production facility can be reduced, and the equipment cost can be greatly reduced. In addition, waste can be reduced and stable operation can be realized.

  In addition, because the restrictions on high equipment costs and site conditions are relaxed, it is possible to flexibly respond to fluctuations in the amount of accompanying water accompanying fluctuations in the amount of collected CBM, increasing the treatment capacity of the accompanying water, and reducing the amount of collected CBM. It is possible to increase the amount.

  In order to achieve the above object, the present invention provides a gas turbine power generator equipped with a gas turbine using hydrocarbon as a main fuel, an exhaust heat recovery boiler that generates steam by exhaust heat of the gas turbine, and concentrates raw water. In a concentrated desalination power plant comprising a concentrating device, the concentrating device separates raw water after pretreatment through the pretreatment device into permeated water and non-permeated water. A reverse osmosis membrane device, and an evaporative concentrator for concentrating the pretreated wastewater generated as a result of the pretreatment and the non-permeate water to produce concentrated water using the generated steam of the exhaust heat recovery boiler as a heat source. Shall be provided.

  Thereby, as described above, the equipment cost can be reduced.

  In addition, by generating concentrated water with the evaporative concentrator using the generated steam of the exhaust heat recovery boiler as a heat source, the energy cost for generating steam in the evaporative concentrator is no longer required. Resources can be used efficiently throughout the facility, and operating costs can be reduced.

  The concentrating device preferably includes a precipitation device for precipitating inorganic components in the non-permeated water in a flow path through which the non-permeated water flows into the evaporation concentrating device. The precipitation apparatus may have one or more of a function of increasing the pH of the non-permeate water, a function of increasing carbonate ions, a function of heating, a function of injecting fine bubbles, and a function of injecting calcium ions. preferable.

  By precipitating as fine crystals floating in water in advance in this way, it becomes possible to grow insoluble salts in the evaporator of the evaporation concentrator with these crystals as nuclei. Scale deposition and growth can be avoided, stable operation can be realized, and chemical usage and labor such as cleaning in cans can be reduced.

  Preferably, the precipitation apparatus is a heater for heating the non-permeated water using the generated steam of the exhaust heat recovery boiler as a heat source, or an apparatus for injecting the exhaust gas discharged from the gas turbine into the non-permeate water. Is provided.

  Thereby, precipitation of calcium carbonate or the like is promoted, and scale precipitation / growth on the evaporator wall surface of the evaporation concentrator is avoided.

  Preferably, the concentrated water production power plant further includes a steam supply system for injecting the generated steam of the exhaust heat recovery boiler into a combustor of the gas turbine, and in this case, the steam supply system includes the exhaust heat recovery It is preferable to have a valve that adjusts the supply amount of steam generated by the boiler to the combustor.

   By supplying the steam to the combustor in this way, the mass flow rate of the combustion gas flowing into the turbine increases, and the power generation amount of the generator can be increased. Or when it is not necessary to increase the electric power generation amount of a generator, the consumption of fuel gas can be reduced.

  Preferably, the concentrated water production power plant further includes an indirect heat exchanger that generates steam to be supplied to the evaporative concentrating device using steam generated by the exhaust heat recovery boiler.

  This separates the system that generates steam from the exhaust heat recovery boiler from the system that flows in and out of the evaporation concentrator, so that the steam generated in the exhaust heat recovery boiler is not mixed with salt. Corrosion of the heat recovery boiler 2 can be avoided.

  Further, the present invention for achieving the above object is a concentration method, wherein the accompanying water discharged together with the coal bed gas from the coal bed is separated into permeated water and non-permeated water using a reverse osmosis membrane, A step of concentrating non-permeated water by an evaporation concentration method and discharging the concentrated water to a storage facility.

  Furthermore, the present invention for achieving the above object includes a step of pretreating raw water in the concentration method, and a step of separating the pretreated water into permeated water and non-permeated water using a reverse osmosis membrane. And a step of producing concentrated water by concentrating the pretreated waste water generated as a result of the pretreatment and the non-permeated water produced in the separation step by an evaporation concentration method.

  In order to achieve the above object, the present invention provides an operation of a concentrated freshwater power plant having a gas turbine power generation device, an exhaust heat recovery boiler, a pretreatment device, a reverse osmosis membrane device, and an evaporative concentration device. In the method, the step of generating electric power and exhaust heat by the gas turbine power generation device, the step of generating steam by the exhaust heat of the gas turbine power generation device by the exhaust heat recovery boiler, and the raw water using the pretreatment device A step of pre-treatment, a step of separating water after pre-treatment via the pre-treatment device into permeated water and non-permeated water using the reverse osmosis membrane device, and steam generated in the exhaust heat recovery boiler As a heat source, it has the process of producing | generating concentrated water by concentrating the pretreatment waste_water | drain produced as a result of the said pretreatment using the said evaporative concentration apparatus, and the said non-permeate water.

  ADVANTAGE OF THE INVENTION According to this invention, the site for the accompanying water treatment equipment in a CBM production facility can be reduced, and equipment cost can be reduced significantly. In addition, waste can be reduced and stable operation can be realized. In addition, because the restrictions on high equipment costs and site conditions are relaxed, it is possible to flexibly respond to fluctuations in the amount of accompanying water accompanying fluctuations in the amount of collected CBM, increasing the treatment capacity of the accompanying water, and reducing the amount of collected CBM. It is possible to increase the amount.

  In addition, according to the present invention, not only can the site for the associated water treatment facility in the CBM production facility be reduced and the operation with reduced waste can be realized, but also the entire facility can be utilized by using the exhaust heat of the power generation facility. This makes it possible to efficiently use resources and reduce operating costs.

It is a schematic diagram which shows the structure of the concentration plant in the 1st Embodiment of this invention. It is a schematic diagram of one structural example of the precipitation part of the concentration plant in the 1st Embodiment of this invention. It is a schematic diagram of the other structural example of the precipitation part of the concentration plant in the 1st Embodiment of this invention. It is a schematic diagram of the further another structural example of the precipitation part of the concentration plant in the 1st Embodiment of this invention. It is a schematic diagram of the further another structural example of the precipitation part of the concentration plant in the 1st Embodiment of this invention. It is a figure which shows the effect of the concentration plant in the 1st Embodiment of this invention. It is a figure which shows the effect of the concentrated desalination power plant in the 2nd Embodiment of this invention. It is a schematic diagram which shows the structure of the concentrated desalination power plant in the 2nd Embodiment of this invention. It is a schematic diagram which shows the structure of the concentrated desalination power plant in the 3rd Embodiment of this invention. It is a schematic diagram which shows the structure of the concentrated desalination power plant in the 4th Embodiment of this invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In addition, the same code | symbol has shown the equivalent thing through each figure.
(First embodiment)
FIG. 1 is a schematic diagram showing a configuration of a concentration plant according to a first embodiment of the present invention. The present embodiment is an example in the case where the accompanying water of a CBM production plant is targeted as raw water. The raw water may be water other than the accompanying water (for example, industrial wastewater, groundwater, salt lake water, etc.), or seawater.

  In FIG. 1, a brine concentrating plant denoted as a whole by reference numeral 100 includes a pretreatment facility 3, a reverse osmosis membrane concentration facility 4 (reverse osmosis membrane device), a storage tank 5, and an evaporation concentration facility 6 (evaporation concentration device). And the concentrated water tank 7 and the precipitation part 10 (precipitation apparatus).

  The accompanying water 20 is subjected to removal of solid / soluble substances by the pretreatment facility 3 or adjusted to a water temperature / pH and the like, and becomes pretreated water 21. The purpose of the pretreatment is to prevent concentration / precipitation of calcium carbonate or the like on the membrane surface of the reverse osmosis membrane concentration equipment 4. The pH of the accompanying water 20 is usually 7 to less than 10, and when the pH is adjusted in the pretreatment, it is generally adjusted to about 6 to 7, although it varies depending on the membrane used, the water temperature, and the like. The pretreated water 21 flows into the reverse osmosis membrane concentration equipment 4 and is separated into permeated water 22 and membrane concentrated water 24. The permeated water 22 is used as fresh water. The membrane concentrated water 24 contains calcium carbonate, silica, and the like, which are components of the accompanying water 20. All of the membrane concentrated water 24 flows into the precipitation unit 10, is subjected to a treatment such as mixing with an alkali agent, and insoluble components such as calcium carbonate are deposited, and then flows into the storage tank 5. All of the pretreatment waste water 23 containing the solid and soluble substances removed from the accompanying water 20 by the pretreatment device 3 flows into the storage tank 5 and is mixed with the membrane concentrated water 24, and the evaporated concentrated feed water 25. It becomes. All of the evaporation concentrated feed water 25 flows into the evaporation concentration facility 6 and is separated into condensed water 26 and evaporated concentrated water 27. The condensed water 26 is used as fresh water. The evaporated concentrated water 27 is stored in the concentrated water tank 7. By placing the reverse osmosis membrane concentrating equipment 4 in the preceding stage and the evaporating and concentrating equipment 6 in the succeeding stage, the concentration and volume can be greatly reduced by combining the preceding and succeeding stages. As a result, processing of the evaporated concentrated water 27 stored in the concentrated water tank 7 is facilitated. The evaporated concentrated water 27 stored in the concentrated water tank 7 is preferably evaporated to dryness at an appropriate timing thereafter.

  The evaporative concentration facility 6 is, for example, a multi-effect evaporator having a plurality of evaporators. As the multi-effect evaporator, for example, the one described in Patent Document 1 (Japanese Patent Application Laid-Open No. 2004-41850) can be used. When the evaporative concentration facility 6 includes a plurality of evaporators, there is a problem that insoluble salts adhere as scales to the inner wall surface of each evaporator. In the present embodiment, the insoluble salt is precipitated as fine crystals floating in water in the precipitation unit 10 in advance, so that the insoluble salt is grown as a nucleus in the evaporator. As a result, scale deposition / growth on the wall surface of the subsequent evaporator can be avoided, stable operation can be realized, and the amount of chemical used and labor for cleaning the inside of the can can be reduced.

  Examples of the apparatus configuration of the precipitation unit 10 are shown in FIGS. 2A to 2D. In the example of FIG. 2A, the membrane concentrated water 24 flows into the mixing water tank 40 and is mixed with the alkaline agent added from the chemical injection equipment 41 to precipitate an insoluble salt such as calcium carbonate. For example, caustic soda or slaked lime can be used as the alkaline agent. The mixing water tank 40 is not provided, and mixing can be performed by a pipe line. In this case, a line mixer may be installed. By adjusting the pH of the evaporated and concentrated feed water 25 to 8.5 or more by injecting an alkaline agent, calcium carbonate can be easily deposited. By setting the pH to 8 or higher and the evaporation temperature to 40 ° C. or higher in the evaporative concentration facility 6, the silica solubility increases and the silica scale generation potential can be reduced. Instead of the alkali agent, calcium ions may be injected.

  As in the example of FIG. 2B, a heating tank 42 (heater) may be provided before the mixing of the alkaline agent, and the membrane concentrated water 24 may be heated. When the water temperature rises, the solubility of calcium carbonate decreases and precipitation is promoted. You may provide only the heating tank 42, without providing the mixing water tank 40 and a line mixer. Further, as in the example of FIG. 2C, a gas 35 containing CO 2 may be injected into the mixing water tank 40a before the addition of the alkaline agent. When the pH is adjusted to be slightly acidic by dissolving CO2, the solubility of slaked lime is increased and the amount of calcium ions can be increased, so that precipitation of calcium carbonate can be promoted. Further, as in the example of FIG. 2D, the membrane concentrated water 24 that has flowed into the mixing water tank 40 b is taken into the fine bubble generating device 43, and the gas 36 containing air or CO 2 is added to the membrane concentrated water 24 in the fine bubble generating device 43. By injecting, fine bubbles having a diameter of about 50 micrometers or less may be generated, and the fine bubbles may be returned to the mixing water tank 40b. In this case, fine crystal nuclei are generated with rapid dissolution of fine bubbles, and precipitation of insoluble salt can be promoted.

  In any case, it is desirable to design so that the flow velocity at each portion does not fall below a predetermined value so that the precipitate does not settle in the mixing water tank 40 or the pipe line in the precipitation portion 10. In addition, you may provide the precipitation part 10 in the back | latter stage of the storage tank 5. FIG.

  Returning to FIG. 1, the accompanying water 20, the permeated water 22, and the condensed water 26 before flowing into the pretreatment facility 3 may be used as the cooling water 28. When the accompanying water 20 is used as the cooling water 28, the salt permeability in the reverse osmosis membrane concentration facility 4 increases as the water temperature increases when the pretreatment facility 3 is supplied and processed by the reverse osmosis membrane concentration facility 4. Therefore, it is desirable that the permeated water 22 be maintained within a range where the water quality can be maintained at a necessary level.

  Further, when the permeated water 22 and the condensed water 26 are compared, the former has a higher salt content than the latter, and therefore may be mixed and used depending on the purpose of use. For example, it is conceivable to use the permeated water 22 as a raw material for drinking water and the condensed water 26 as industrial water that requires a low salt content. In addition, when the accompanying water 20 is used as the cooling water 28 as mentioned above, the accompanying water 20 is heated and the salt content of the permeated water 22 may increase by the heating. In this case, the quality of the water can be adjusted by mixing the accompanying water 20 after heating with the condensed water 26.

  Below, the effect by the said structure is demonstrated.

  FIG. 3A is a conceptual diagram of the effect of the present embodiment. The vertical axis is the expected value of the ratio when the installation cost of the evaporation pond is compared with the conventional evaporation pond method and the reverse osmosis membrane concentration method.

  In the case of the conventional evaporating basin equipment cost of 1, in the case of the conventional reverse osmosis membrane concentration method, the water to be treated in the evaporating pond is reduced to about 1/10 compared to the evaporating basin method without concentration. Installation costs will be reduced accordingly. In the present embodiment, when evaporating concentrated water 27 stored in the concentrated water tank 7 is evaporated to dryness, the evaporating pond is unnecessary and the evaporating pond installation cost is zero. Moreover, in this Embodiment, it may replace with the concentrated water tank 7 as a storage facility, and an evaporating pond may be provided, and also in this case, the installation area of an evaporating pond can be reduced significantly and the installation cost of an evaporating pond can be reduced. .

  Thus, by taking the configuration of the present embodiment, the site for the associated water treatment facility in the CBM production facility can be reduced, and the equipment cost can be greatly reduced. In addition, waste can be reduced and stable operation can be realized.

  In addition, because the restrictions on high equipment costs and site conditions are relaxed, it is possible to flexibly respond to fluctuations in the amount of accompanying water accompanying fluctuations in the amount of collected CBM, increasing the treatment capacity of the accompanying water, and reducing the amount of collected CBM. It is possible to increase the amount.

Moreover, by providing the precipitation part 10 in the flow path into which the membrane concentrated water 24 flows into the evaporation concentration equipment 6, scale deposition and growth on the wall surface of the evaporator can be avoided, and stable operation can be realized. The amount of chemicals used for internal cleaning and labor can be reduced.
(Second to fourth embodiments)
FIG. 4 is a schematic diagram showing a configuration of a concentrated desalination power plant according to the second embodiment of the present invention. In the present embodiment, a gas turbine power generation facility is additionally provided in the concentration plant in the first embodiment.

  In FIG. 4, the concentrated desalination power plant includes a gas turbine power generation device 200 including a gas turbine 1 that uses hydrocarbon, for example, LNG as a main fuel, and an exhaust heat recovery boiler 2 that generates steam by the exhaust heat of the power generation device 200. And a concentrating device 300. As the concentration apparatus 300, for example, the concentration plant 100 of the first embodiment is used.

  In the gas turbine power generation facility 200, the gas turbine 1 includes a compressor 1a, a turbine 1b, a combustor 8, a generator 9, and an exhaust gas treatment tower 12. The air 30 is compressed by the compressor 1 a to become compressed air 30 a, flows into the combustor 8, and is mixed with the fuel gas 33. The fuel gas 33 is combusted in the combustor 8 to become combustion gas, and flows out as exhaust gas 31 after rotating the turbine 1b. The generator 9 receives electricity from the turbine 1b and generates electricity. The exhaust gas 31 flows into the exhaust heat recovery boiler 2, generates steam by exhaust heat, is sent to the exhaust gas treatment tower 12, is processed by the exhaust gas treatment tower 12, and is diffused into the atmosphere.

  Inside the exhaust heat recovery boiler 2, a heat exchanger 2a of the first steam supply system 32A is arranged. Circulating water flows through the first steam supply system 32 </ b> A, and the exhaust gas 31 that has flowed into the exhaust heat recovery boiler 2 supplies heat to the circulating water through the heat exchanger 2 a to change the phase to the steam 32. The steam 32 flows into the evaporative concentration facility 6 and heats the evaporative concentrated feed water 25 to change the phase to steam. The generated steam is cooled by cooling water 28 to become condensed water 26. The steam 32 is deprived of heat and returns to the circulating water.

  The configuration of the concentrating device 300 (concentrating plant 100) is the same as that of the first embodiment. That is, the accompanying water 20 is subjected to removal of solid / soluble substances by the pretreatment facility 3 or the water temperature / pH and the like are adjusted to become pretreated water 21. The pretreated water 21 flows into the reverse osmosis membrane concentration equipment 4 and is separated into permeated water 22 and membrane concentrated water 24. The permeated water 22 is used as fresh water. The membrane concentrated water 24 flows into the precipitation part 10 and is mixed with an alkaline agent to precipitate insoluble components, and then flows into the storage tank 5. Pretreatment wastewater 23 containing solid and soluble substances removed from the accompanying water 20 by the pretreatment device 3 also flows into the storage tank 5 and is mixed with the membrane concentrated water 24 to become the evaporated concentrated supply water 25. The evaporated concentrated feed water 25 flows into the evaporated concentration facility 6 and is separated into condensed water 26 and evaporated concentrated water 27. The condensed water 26 is used as fresh water. The evaporated concentrated water 27 is stored in the concentrated water tank 7.

  When the heating tank 42 shown in the example of FIG. 2B is provided as the apparatus configuration of the precipitation unit 10, the exhaust gas 31 of the gas turbine 1 may be used as a heat source of the heating tank 42. Moreover, you may utilize the waste gas 31 of the gas turbine 1 as the gas 33 containing CO2 in the example of FIG. 2C and FIG. 2D. The exhaust gas 31 may be after heat exchange in the exhaust heat recovery boiler 2. FIG. 4 is an example in which the exhaust gas 31 after heat exchange in the exhaust heat recovery boiler 2 is supplied to the precipitation unit 10.

  As a power source for the pretreatment facility 3 and the reverse osmosis membrane concentration facility 4, the power generated by the generator 9 can be used. As the fuel gas 33, LNG produced from CBM can be used. Thus, by using energy and raw materials present in the plant, power transmission loss and transportation costs are reduced.

  FIG. 5 shows an example (third embodiment) in which the amount of heat of the steam 32 is supplied to the evaporative concentration facility 6 via the indirect heat exchanger 13. When the steam 32 is directly supplied to the evaporation concentration facility 6, depending on the structure of the evaporation concentration facility 6, salts derived from the evaporation concentration supply water 25 may be mixed into the steam flowing into the evaporation concentration facility 6. In the example of FIG. 5, the first steam supply system includes a primary steam supply system 32B including a heat exchanger 2a, a secondary evaporator supply system 32C that supplies steam to the evaporation concentration facility 6, and a primary steam supply system 32B. And an indirect heat exchanger 13 that generates steam by supplying heat to the circulating water of the secondary evaporator supply system 32C. Since the system 32B of the steam 32 and the system 32C flowing into and out of the evaporative concentration facility 6 are separated, salt is not mixed into the steam 32, and corrosion of the exhaust heat recovery boiler 2 can be avoided.

  FIG. 6 shows an example (fourth embodiment) in the case where steam generated by the exhaust heat recovery boiler 2 is injected into the combustor 8. In this example, the heat source generated by the exhaust heat recovery boiler 2 is also used as the heat source of the heating tank 42 (FIG. 2B) of the precipitation unit 10.

  In FIG. 6, in the exhaust heat recovery boiler 2, there are a heat exchanger 2a of the first steam supply system 32A, a heat exchanger 2b of the heat source supply system 202A, and a heat exchanger 2c of the second steam supply system 34A. In the exhaust heat recovery boiler 2, the steam 32 to the evaporative concentration facility 6, the heat source 210 to the heating tank 42 of the precipitation unit 10, and the steam 34 to the combustor 8 are generated separately. The heat source 210 for the heating tank 42 of the precipitation unit 10 may be steam-water or hot-cold water. Moreover, substances other than water can also be used. A normally closed valve 11 is provided in a pipeline through which the steam 34 of the second steam supply system 34 </ b> A flows, and the valve 11 is opened to supply the steam 34 to the combustor 8. When the steam 34 is supplied to the combustor 8, the mass flow rate of the combustion gas flowing into the turbine 1b increases, and the power generation amount of the generator 9 can be increased. When it is not necessary to increase the power generation amount of the generator 9, the consumption amount of the fuel gas 33 can be reduced. The steam 34 is mixed into the exhaust gas 31 and is released to the atmosphere via the exhaust heat recovery boiler 2 and the exhaust gas treatment tower 12. In the concentrator 300, the permeated water 22 and the condensed water 26 are generated as fresh water, and water is supplied to the heat exchanger 2 c in the exhaust heat recovery boiler 2 using these. FIG. 6 shows an example in which a part of the condensed water 26 is taken out and supplied to the heat exchanger 2c. Moreover, although not shown in figure, when the purity of the fresh water obtained is low, you may provide a purification apparatus.

  This embodiment is extremely effective for the treatment of accompanying water from CBM. Hydrocarbons such as methane produced from CBM can be used as fuel for the gas turbine 1. The electric power generated by the gas turbine 1 can be used in the concentrator 100. Surplus power can be supplied to the outside. The associated water concentration from CBM is as small as about 1/5 of the seawater concentration, and the osmotic pressure is small. Therefore, the power consumption of the reverse osmosis membrane concentration equipment 4 can be kept small in the present invention in which the reverse osmosis membrane concentration equipment 4 is placed in the front stage and the evaporation concentration equipment 6 is placed in the rear stage. Steam 32 to be supplied to the evaporative concentration facility 6 can be generated by exhaust heat of the gas turbine 1. In addition, the pre-stage and the post-stage can be combined to greatly reduce the volume, and the electric power and exhaust heat from the gas turbine 1 can be used.

  In addition, accompanying water from CBM contains more carbonate, which is an underground rock component, than seawater. The carbonate precipitates when the temperature is raised, causing contamination of the heat transfer surface of the evaporative concentration facility 6. In order to avoid this, the heating tank 42 is provided in the precipitation unit 10 and heated by the heat source 210, the carbonate is precipitated and separated, and the concentrated water is sent to the evaporation concentration facility 6. The exhaust heat of the gas turbine 1 is also used as the heat source of the heat source 210.

  Moreover, the opening degree of the valve 11 is adjusted according to fluctuations such as the accompanying water treatment amount and the power supply amount. For example, when the accompanying water treatment amount is small and the power supply amount is large, the valve 34 is opened and the steam 34 sent to the combustor 8 is increased. In this case, the amount of heat recovered by the exhaust heat recovery boiler 2 is often used to generate the steam 34, and the heating amount of the steam 32 and the heat source 210 is reduced.

  Below, the effect by the structure of the said embodiment which provided the gas turbine power generation equipment 200 and the waste heat recovery boiler 2 side by side with the concentration apparatus 300 is demonstrated.

  FIG. 3B is a conceptual diagram of the effect of this embodiment. The vertical axis is the expected value of the ratio when the operation cost of the concentration plant is compared with the conventional evaporating basin method and the reverse osmosis membrane concentration method.

  The conventional evaporating basin method uses solar concentration, so the operating cost is 0. In contrast, the conventional reverse osmosis membrane concentration method requires operating costs such as power and membrane replacement for reverse osmosis membrane concentration equipment. Is required.

  On the other hand, in the case of the configuration of the concentration plant alone, it is possible to reduce the concentration rate in the reverse osmosis membrane concentration facility 4 because it is a two-stage concentration, but the energy cost for generating steam in the evaporation concentration facility 6 is reduced. Necessary. In contrast, in the case of the configuration in which the gas turbine power generation facility 200 and the exhaust heat recovery boiler 2 of the present embodiment are provided side by side, the steam is supplied from the exhaust heat recovery boiler 2, so that the steam generation in the evaporation concentration facility 6 is generated. No energy costs are required.

  By adopting the configuration of the present embodiment in this way, not only can the site for the associated water treatment facility in the CBM production facility be reduced and the operation with reduced waste can be realized, but also the exhaust heat of the power generation facility By using this, it is possible to efficiently use resources throughout the facility, and it is possible to reduce operating costs.

DESCRIPTION OF SYMBOLS 1 ... Gas turbine 1a ... Compressor 1b ... Turbine 2 ... Waste heat recovery boilers 2a, 2b, 2c ... Heat exchanger 3 ... Pretreatment equipment 4 ... Reverse osmosis membrane Concentration equipment (reverse osmosis membrane device)
5 ... Storage tank 6 ... Evaporation concentration equipment (evaporation concentration device)
7 ... Concentrated water tank 8 ... Combustor 9 ... Generator 10 ... Precipitation part (precipitation apparatus)
DESCRIPTION OF SYMBOLS 11 ... Valve 12 ... Exhaust gas treatment tower 13 ... Indirect heat exchanger 20 ... Accompanying water 21 ... Pretreatment water 22 ... Permeated water 23 ... Pretreatment drainage 24 ... Membrane concentrated water 25 ... Evaporated concentrated feed water 26 ... Condensed water 27 ... Evaporated concentrated water 28 ... Cooling water 30 ... Air 30a ... Compressed air 31 ... Exhaust gas 32 ... Steam 32A ... first steam supply system 33 ... fuel gas 34 ... steam 34A ... second steam supply system 35 ... CO2-containing gas 40 ... mixed water tank 41 ... chemical injection equipment 42 ... Heating tank (heater)
43 ... Microbubble generator 100 ... Concentration plant (concentrator)
200 ... Gas turbine power generation device 210 ... Heat source 210A ... Heat source supply system 300 ... Concentration device

Claims (19)

A reverse osmosis membrane device (4) for separating the accompanying water discharged from the coal seam together with the coal seam gas into permeated water and non-permeated water;
An evaporating and concentrating device (6) for concentrating the non-permeate water and discharging the concentrated water to a storage facility (7);
A concentrating plant characterized by comprising: A pretreatment device (3) for pretreating raw water;
A reverse osmosis membrane device (4) for separating water after pretreatment via this pretreatment device into permeated water and non-permeated water;
An evaporating and concentrating device (6) for concentrating the pretreatment wastewater generated in the pretreatment device and the non-permeated water generated in the reverse osmosis membrane device to generate concentrated water;
A concentrating plant characterized by comprising: The flow path through which the non-permeate water flows into the evaporative concentration apparatus (6) includes a precipitation apparatus (10) for precipitating inorganic components in the non-permeate water.
The concentration plant according to claim 1 or 2, wherein The precipitation apparatus (10) has one or more of a function of increasing the pH of the non-permeate water, a function of increasing carbonate ions, a function of heating, a function of injecting fine bubbles, and a function of injecting calcium ions. Have
The concentration plant according to claim 3. A gas turbine power generator (200) including a gas turbine (1) using hydrocarbon as a main fuel;
An exhaust heat recovery boiler (2) for generating steam by exhaust heat of the gas turbine;
A concentrator (300) for concentrating the raw water;
Concentrated desalination power plant with
The concentration device (300)
A pretreatment device (3) for pretreating raw water;
A reverse osmosis membrane device (4) for separating water after pretreatment via this pretreatment device into permeated water and non-permeated water;
An evaporative concentrator (6) for producing concentrated water by concentrating the pretreated waste water generated as a result of the pretreatment and the non-permeate water, using the generated steam of the exhaust heat recovery boiler (2) as a heat source;
A concentrated desalination power plant characterized by comprising: The concentration device (300) further includes a precipitation device (10) for precipitating inorganic components in the non-permeate water in a flow path through which the non-permeate water flows into the evaporation concentration device (6).
The concentrated desalinating power plant according to claim 5. The precipitation apparatus (10) has one or more of a function of increasing the pH of the non-permeate water, a function of increasing carbonate ions, a function of heating, a function of injecting fine bubbles, and a function of injecting calcium ions. Have
The concentrated desalinated power plant according to claim 6. The precipitation apparatus (10) includes a heater (42) that heats the non-permeated water using the generated steam of the exhaust heat recovery boiler (2) as a heat source.
The concentrated desalinated power plant according to claim 6. A steam supply system (34A) for injecting the generated steam of the exhaust heat recovery boiler (2) into the combustor (8) of the gas turbine (1);
The concentrated fresh water power plant according to any one of claims 5 to 8. The steam supply system (34A) includes a valve (11) that adjusts the supply amount of steam generated by the exhaust heat recovery boiler (2) to the combustor (8).
The concentrated desalinating power plant according to claim 9. The precipitation device (10) includes a device (40a) for injecting the exhaust gas discharged from the gas turbine (1) into the non-permeate water.
The concentrated fresh water power plant according to any one of claims 6 to 10. An indirect heat exchanger (13) for generating steam to be supplied to the evaporative concentrator (6) with the generated steam of the exhaust heat recovery boiler (2);
The concentrated fresh water power plant according to any one of claims 5 to 11. Separating the accompanying water discharged from the coal seam together with the coal seam gas into permeated water and non-permeated water using a reverse osmosis membrane;
A step (6) of concentrating the non-permeate water by an evaporation concentration method and discharging the concentrated water to the storage facility (7);
Concentration method characterized by having. A step (3) of pretreating raw water;
Separating the pretreated water into permeated water and non-permeated water using a reverse osmosis membrane (4);
A step (6) of producing concentrated water by concentrating the pretreated waste water generated as a result of the pretreatment and the non-permeated water generated in the separation step by an evaporation concentration method;
Concentration method characterized by having. Between the separation step (4) using the reverse osmosis membrane and the step (6) of concentrating the non-permeate water by an evaporation concentration method, a step (10) of depositing an inorganic component in the non-permeate water is interposed. The
The concentration method according to claim 13 or 14, characterized in that: The precipitation step (10) includes at least one of a function of increasing the pH of the non-permeate water, a function of increasing carbonate ions, a function of heating, a function of injecting fine bubbles, and a function of injecting calcium ions. Using said precipitation
The concentration method according to claim 15. Concentrated desalination power plant having a gas turbine power generation device (200), an exhaust heat recovery boiler (2), a pretreatment device (3), a reverse osmosis membrane device (4), and an evaporative concentration device (6) In the driving method of
Generating electric power and exhaust heat by the gas turbine power generator (200);
Generating steam by exhaust heat of the gas turbine power generator (200) by the exhaust heat recovery boiler (2);
Pretreatment of raw water using the pretreatment device (3);
Separating the water after pretreatment via the pretreatment device (3) into permeated water and non-permeated water using the reverse osmosis membrane device (4);
Using the steam generated in the exhaust heat recovery boiler (2) as a heat source, the pretreatment waste water generated as a result of the pretreatment using the evaporative concentration device (6) and the non-permeate water are concentrated to produce concentrated water. And a process of
A method for operating a concentrated desalinating power plant, comprising: Between the separation step using the reverse osmosis membrane device (4) and the step of concentrating non-permeated water using the evaporative concentration device (6), the inorganic in the non-permeated water using a precipitation device (10) Intervening the process of precipitating the components,
The operation method of the concentrated desalination power plant according to claim 17. In the precipitation apparatus (10), the precipitation step includes a function of increasing the pH of the non-permeate water, a function of increasing carbonate ions, a function of heating, a function of injecting fine bubbles, and a function of injecting calcium ions. Performing the precipitation using one or more of:
The operation method of the concentrated desalinating power plant according to claim 18.

Images