JP2007017035A - System for effectively using energy - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a system capable of generating condensed water suitably used in a boiler or the like using generated vapor and attaining further efficient use of the condensed water. <P>SOLUTION: The system for effectively using energy uses, in a sub-steam supply line 4 different from a main vapor supply line 3 of a vapor generation part 2 generating vapor using exhaust gas of an engine 1, a vapor ejector 6 connected to a pressure-reduced part 7, and comprises a condenser 10 including an indirect condensation part 8 condensing the vapor passed through the vapor ejector 6 and a condensed water storage part 9; a pressure reducing means 11, reducing the pressure in the condenser 10; a condensed water discharge means 12 discharging the condensed water from the condenser 10; and high-performance water using devices 2 and 14 using the condensed water as supply water. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a system for effectively using energy.

  There is known a system that effectively uses energy by recovering retained heat of exhaust gas emitted from an engine by an exhaust gas boiler and using the generated steam for air conditioning and the like. In this system, the overall configuration of the system, such as the type and quantity of equipment that uses steam, is designed based on the amount and temperature of exhaust gas emitted from the engine. Depending on the load situation using the generated steam, extra steam may be generated. In this case, a bypass path is provided so that the exhaust gas from the engine is not input to the exhaust gas boiler, and the generation of steam is interrupted, or excess steam generated by the exhaust gas boiler is released into the atmosphere. Therefore, in such a conventional system, the effective use of energy has not been sufficiently performed.

  Generally, there is a system described in Patent Document 1 as a system that effectively uses steam generated from an exhaust gas boiler. In this system, electric power is obtained by operating a generator by an engine, while exhaust gas discharged from the engine is sent to an exhaust gas boiler, and steam generated there is passed through a steam ejector to obtain steam from a vacuum evaporator. At the same time, these steams are sent to steam utilization equipment, and the condensed water obtained there is circulated to the exhaust gas boiler via a drain tank and a water softener.

  In other words, in this system, the steam generated in the exhaust gas boiler is used to obtain steam from the vacuum evaporator, and the steam is converted into condensed water through the steam utilization equipment and reused to recycle energy. Effective use is planned.

JP 20024943 A

  However, the condensed water produced in this system may have a reduced quality of water as make-up water for boilers and the like, that is, it is unsuitable as high-function water required as make-up water for boilers and the like. Therefore, when the condensed water in this system is reused, the water pipes of the exhaust gas boiler are easily corroded. In this respect, in order to make the condensed water generated by this system highly functional water, a facility such as a deaeration device is additionally required.

  The object of the present invention is to solve such problems of the prior art. Specifically, an object of the present invention is to provide a system that uses the generated steam to generate condensed water suitable for reuse in boilers and the like, and can further utilize this condensed water. To do.

  The present invention has been made to solve the above-mentioned problems, and the invention according to claim 1 is a sub-steam that is separate from the main steam supply line of the steam generation section that generates steam using the exhaust gas of the engine. In an effective energy utilization system using a steam ejector connected to a reduced pressure part in a supply line, a condensing device having an indirect condensing unit and a condensed water storage unit for condensing the steam that has passed through the steam ejector, and the condensing device It is characterized by comprising a decompression means for decompressing the inside, a condensed water discharge means for discharging condensed water from the inside of the condenser, and a high-function water using device that uses the condensed water as makeup water.

  A second aspect of the present invention is characterized in that, in the first aspect, the high-performance water using device is the steam generation unit and / or a cooling tower.

  A third aspect of the present invention is characterized in that, in the second aspect, the cooling water passing through the indirect condensing unit is cooled by the cooling tower.

  A fourth aspect of the present invention is characterized in that, in the second or third aspect, the cooling water line passing through the indirect condensing unit passes through one or more indirect heat exchangers.

  Furthermore, the invention according to claim 5 is characterized in that in any one of claims 1 to 4, a plurality of the auxiliary steam supply lines are provided.

  According to the first aspect of the present invention, the steam generated by the steam generating unit can be highly functionalized and effectively used.

  According to the second aspect of the present invention, when high-performance water is used as makeup water in the steam generation section, the amount of concentrated water discharged (blow amount) can be reduced, and the occurrence of corrosion, scale, etc. is suppressed. can do. When high-performance water is used as a supplementary water in the cooling tower, it is possible to suppress the growth of algae, slime, and Legionella, reducing the concentration of circulating water and suppressing the occurrence of corrosion. The amount of drainage (blow amount) can be reduced.

  According to the third aspect of the present invention, the condensation of the steam is promoted by the cooling action of the cooling tower.

  According to invention of Claim 4, the further effective utilization of the energy of the vapor | steam produced | generated by the said steam generation part can be aimed at.

  According to invention of Claim 5, highly functional water can be produced | generated in several places.

(Embodiment)
An embodiment of the present invention will be described. In this embodiment, an effective energy use system using a steam ejector connected to a reduced pressure part in a sub-steam supply line separate from a main steam supply line of a steam generation part that generates steam using engine exhaust gas A condensing device having an indirect condensing part for condensing the steam that has passed through the steam ejector, a condensate water storage part, a decompression means for depressurizing the inside of the condensing device, and a condensing unit for discharging condensed water from the condensing device A water discharge means and a high-function water use device that uses condensed water as makeup water are provided.

  According to this embodiment, the steam that has passed through the steam ejector is sent to the condensing device and becomes condensed water, but the steam does not contain impurities, so it becomes pure water. In the condensing device, air as non-condensable gas is discharged by the decompression means, so that the obtained condensed water is degassed. Therefore, if this condensed water is used as makeup water in the high function water use device, a configuration for newly providing a device for adapting to the high function water use device becomes unnecessary.

  Next, components of this embodiment will be described. The engine includes a gas engine, a gasoline engine, a diesel engine, a gas turbine engine, and the like.

The said steam generation part should just generate | occur | produce a vapor | steam. Examples of the steam generator include an exhaust gas boiler that includes a plurality of water pipes therein and heats the water pipe with exhaust gas from an engine, thereby generating steam. The exhaust gas boiler includes an exhaust gas bypass path provided outside or inside the main body so as not to pass the exhaust gas from the engine to the inside because steam is not generated.

  The main steam supply line and the sub-steam supply line are both for guiding the steam generated in the steam generating section to various steam-using devices (generally referred to as “load devices”). However, while the sub-steam supply line is provided with the steam ejector and the like on the downstream side, the steam ejector is generally not provided on the downstream side of the main steam supply line. . In addition, depending on the difference in the amount of steam that can be supplied, the scale and importance of the equipment of the load device, it does not matter which is the main or subordinate of the steam supply line. Both the main steam supply line and the sub-steam supply line may be directly connected to the steam generation unit, either one is directly connected to the steam generation unit, and the other is connected from one line You may branch and provide. A plurality of the sub-steam supply lines may be provided, may be provided by branching from the main steam supply line and the other sub-steam supply lines, or may be directly connected to the steam generation unit.

  The part to be decompressed includes a vacuum chilled water production apparatus, a vacuum thawing machine, a vacuum chiller, a steaming chiller, and the like, and can achieve a predetermined purpose by reducing the pressure inside.

  The steam ejector forms a negative pressure region inside by allowing the steam to pass therethrough. When the steam ejector is connected to the decompressed part and the steam is allowed to pass through, the interior of the decompressed part is decompressed by a negative pressure action.

  The said condensation apparatus consists of the said indirect type condensation part and the said condensed water storage part, and is an apparatus which condenses the vapor | steam produced | generated in the said steam generation part by the heat exchange effect | action. The indirect condensing unit has a function of indirectly exchanging heat with the steam generated in the steam generating unit to condense, and preferably a shell and tube type heat exchanger. By indirectly performing the condensation, it is possible to avoid contamination of the condensed water. The condensate storage part is for storing the condensed water condensed by the indirect condenser part, and includes a part provided separately from the indirect condenser part. It is preferable to provide it directly under an indirect condensation part. Furthermore, when it is provided directly below, it can be configured as an integral type or a separate type.

  The depressurizing means is for depressurizing the inside of the condensing device and discharging air which is a non-condensable gas. By depressurizing the inside of the condenser and condensing the vapor, air does not dissolve in the condensed water, so the condensed water in the condenser is degassed. If the decompression means is connected to the downstream side of the indirect condensing part, it is preferable in that it is difficult to discharge steam before condensation. Moreover, since the said pressure reduction means does not discharge | emit condensed water if it decompresses in the upper position from the water surface of the condensed water stored in the said condensed water storage part, it is preferable. Examples of the pressure reducing means include a vacuum pump, a steam ejector, and a water ejector. Preferably, a water ring vacuum pump is used as the vacuum pump.

  The condensed water discharging means is for discharging condensed water in the condensing device. The condensed water discharge means has a discharge processing capacity that does not hinder the pressure reducing operation of the pressure reducing means.

The high function water use device is a concept including the steam generation unit and the cooling tower, but it is preferable to use the high function water suitably. A plurality of the high function water use devices may be provided, or the high function water use devices of different types may be provided. High-function water is a concept that includes degassed pure water. If this high-performance water is supplied as make-up water to an exhaust gas boiler, which is an example of the high-performance water use device, it is pure water, so the amount of concentrated water discharged ( (Blow amount) can be expected to be reduced, scale and corrosion can be suppressed, and high-function water is warm water, so there is a water supply preheating effect. In addition, if high-function water is supplied to the cooling tower as make-up water, it is possible to suppress the growth of algae, slime, and Legionella, and to reduce the concentration of circulating water and the occurrence of corrosion.

  Hereinafter, specific embodiments of an effective energy use system embodying the present invention will be described in detail with reference to the drawings. FIG. 1 shows an effective energy use system of the first embodiment.

  In FIG. 1, the effective energy use system of the first embodiment includes an exhaust gas boiler 2 as a specific example of a steam generation unit that generates steam using the exhaust gas of the engine 1 and a main steam supply line 3. A steam ejector 6 provided on the path of the first sub-steam supply line 4, a vacuum chilled water producing machine 7 as a specific example of a portion to be decompressed connected to the steam ejector 6, and the steam ejector 6. A condensing device 10 having an indirect condensing unit 8 and a condensate water storage unit 9 for condensing the steam, a water-sealed vacuum pump 11 as a specific example of a depressurizing means for depressurizing the inside of the condensing device 10, and the condensing device A discharge pump 12 as a specific example of condensed water discharge means for discharging condensed water from the inside 10, a storage tank 13 for storing condensed water, that is, high-functional water, and an exhaust gas boiler that uses condensed water as makeup water It is configured of a 2 and a cooling tower 14. In the effective energy use system of the first embodiment, the cooling water passing through the indirect condenser 8 is further cooled by the cooling tower 14.

  The engine 1 operates the generator 15 and sends exhaust gas to the exhaust gas boiler 2. The exhaust gas boiler 2 corresponds to a steam generation unit, and generates steam using the exhaust gas from the engine 1. The exhaust gas boiler 2 is connected to the main steam supply line 3 and the first auxiliary steam supply line 4 that is separate from the main steam supply line 3. A supply line 5 is provided.

  The vacuum chilled water producing machine 7 corresponds to a part to be decompressed. When the treated water is supplied from the treated water supply pump 17 to the inside of the main body in a decompressed state and the treated water is sprayed from the upper position of the main body, Loses its latent heat of evaporation and becomes cold water. The obtained cold water is sent from the cold water feed pump 18 to various places for use.

  The condensing device 10 includes the indirect condensing unit 8 and the condensate storage unit 9, which is a shell and tube heat exchanger in this embodiment. A plurality of tubes 16, 16,... For introducing steam are erected at predetermined intervals in the indirect condenser 8, and cooling water is supplied from the cooling water line 19 to the indirect condenser 8. The heat exchange is performed indirectly with steam by being introduced and contacting the outside of each tube 16. The cooling water is heat-exchanged, then cooled by the cooling tower 14 and circulated again to the indirect condenser 8.

  The water-sealed vacuum pump 11 corresponds to a decompression unit, and actively introduces steam from the steam ejector 6 into the condensing device 10 by bringing the condensing device 10 into a decompressed state. It has the role of discharging air, which is a non-condensable gas. The water-sealed vacuum pump 11 ensures the amount of condensed water stored in the condensed water storage unit 9 and prevents the condensed water from being sucked and discharged. It is connected to the upper position. In addition, the water-sealed vacuum pump 11 is connected to the downstream side of the indirect condensing unit 8, thereby making it difficult to discharge steam before condensation. The water-sealed vacuum pump 11 can change the processing capacity by adjusting the temperature of the sealed water.

  The discharge pump 12 corresponds to condensed water discharge means. The condensed water in the condensing device 10 that has been decompressed by the water ring vacuum pump 11 is discharged.

  The storage tank 13 is for storing the condensed water stored in the condensed water storage unit 9, and from here through the make-up water supply lines 20, 20, the exhaust gas boiler 2 and the cooling tower are stored. 14.

  The exhaust gas boiler 2 corresponds to one of a steam generation unit and a high-function water use device, and water supply to the exhaust gas boiler 2 is made up of makeup water from the condensed water storage unit 9, a water softener 21 and an appropriate drainage. The degassed soft water that has passed through a gas device (not shown) joins in the makeup water tank 22 and is sent to the exhaust gas boiler 2.

  The cooling tower 14 corresponds to one of high-performance water use devices, and exemplifies a generally known open type cooling tower. In other words, the cooling tower 14 includes a main body including an opening in the upper part and a storage tank in the lower part, and a fan for generating an air flow in the main body. The cooling water is sprayed from the lower position of the fan and cooled by coming into contact with the airflow generated by the fan. Thereafter, the water is stored in the storage tank, passes through the cooling water line 19, passes through the indirect condensing unit 8, and returns to the cooling tower 14 again. The returned cooling water retains heat by heat exchange in the indirect condensing unit 8 and partly evaporates while being dispersed in the cooling tower 14 and is released to the atmosphere from the opening. .

  Part of the steam generated by the exhaust gas boiler 2 passes through the first sub-steam supply line 4, passes through the steam ejector 6, and is guided to the tubes 16. At this time, a part of the steam in the vacuum cold water producing machine 7 is also sucked into the steam ejector 6. In the condensing device 10, air, which is a non-condensable gas, is discharged by the water-sealed vacuum pump 11, so that the air does not dissolve in the condensing water, so that the condensed water in the condensing device 10 is removed. It will be something you care about. Further, the steam condenses by performing heat exchange with the cooling water introduced into the indirect condensing unit 8 and accumulates in the condensed water storage unit 9. The condensed water thus obtained is a condensed product of vapor free from impurities from the exhaust gas boiler 2 and the vacuum chilled water producing machine 7 and does not contain air that is a non-condensable gas (that is, highly functional water). ). This highly functional water is stored in the storage tank 13 and supplied to the exhaust gas boiler 2 and the cooling tower 14 as makeup water.

  A chemical injection device 23 is provided on the downstream side of the makeup water tank 22. This is for the purpose of optimization by injecting sodium hydrogen carbonate, sodium hydroxide or the like as a pH adjuster into the high-functional water supplied to the exhaust gas boiler 2. Thereby, further suppression of corrosion of the exhaust gas boiler 2 can be performed.

  In this first embodiment, the storage tank 13 is provided, but depending on the amount of condensed water produced, the amount used, etc., the storage tank 13 is not provided, and highly functional water is directly supplied from the condensed water storage unit 9. You may make it supply to the exhaust gas boiler 2 and the said cooling tower 14. FIG. Moreover, it can also be supplied as make-up water to the high function water use device other than the exhaust gas boiler 2 and the cooling tower 14.

  In the first embodiment, the vacuum chilled water production machine 7 is used as the part to be decompressed. However, as another modified example, a vacuum thawing machine, a vacuum chiller, a steaming cooling device, etc. may be used. It is also preferable to provide a filter on the downstream side of the condensing device 10 and further remove impurities due to the required highly functional water.

Furthermore, in another modified example, a water level meter (not shown) that measures the water level in the condensed water reservoir 9
For controlling the processing amount of the discharge pump 12 so that the condensed water does not disappear from the condensed water reservoir 9 and the water-sealed vacuum pump 11 does not suck in condensed water. A portion (not shown) can also be provided. Thereby, it is more preferable because it is possible to prevent idling of the discharge pump 12 and discharge of condensed water by the water-sealed vacuum pump 11.

  According to the first embodiment, the steam is condensed under reduced pressure, and thus the condensed water obtained is discharged from the air, which is a non-condensable gas, and the exhaust gas boiler 2 and the vacuum chilled water producing machine 7. Since the steam from is indirectly condensed by the condensing device 10, it becomes condensed water (pure water) free of impurities. And since this condensed water is supplied to the said exhaust gas boiler 2 and the said cooling tower 14 as make-up water, energy can be utilized effectively.

  That is, when this condensed water is used as makeup water in the exhaust gas boiler 2, since it is pure water, the drainage amount (blow amount) of concentrated water can be reduced, and scale is suppressed because there is no hardness such as calcium and magnesium. be able to. Moreover, since it is pure water, it does not have sulfate ions and chloride ions, which are corrosive factors such as the water pipe of the exhaust gas boiler 2, and is degassed, it is possible to suppress the occurrence of corrosion of the water pipe. Furthermore, since condensed water is warm water, energy for preheating water supply can be suppressed. On the other hand, when this condensed water is used as make-up water for the cooling tower 14, since the hardness is not included, the growth of algae, slime and Legionella can be suppressed. Moreover, since it is a pure water, concentration of circulating water can be reduced and the drainage amount (blow amount) of concentrated water can be reduced. Furthermore, since there are no sulfate ions and chloride ions, the occurrence of corrosion can be suppressed.

  FIG. 2 shows an effective energy use system of the second embodiment. The same components in the effective energy use system of the first embodiment in FIG. 1 are denoted by the same reference numerals, and detailed description thereof is omitted.

  In FIG. 2, the effective energy use system of the second embodiment is configured such that the exhaust gas boiler 2 that generates steam by using the exhaust gas of the engine 1 and the first sub-line separate from the main steam supply line 3. The steam ejector 6 provided on the path of the steam supply line 4, the vacuum chilled water production machine 7 connected to the steam ejector 6, and the indirect condensing unit that condenses the steam that has passed through the steam ejector 6. 8, the condensing device 10 having the condensate water storage unit 9, the water-sealed vacuum pump 11 for decompressing the condensing device 10, the discharge pump 12 for discharging condensed water from the condensing device 10, The storage tank 13 for storing condensed water, the exhaust gas boiler 2 and the cooling tower 14 using condensed water as makeup water, the cooling water in the cooling water line 19 and the cooling tower 1 The first indirect heat exchanger 24 that exchanges heat with the circulating water in the circulation line 26 that circulates through the cooling water line 19 is provided in the path of the cooling water line 19 to exchange heat with the cooling water in the cooling water line 19. A second indirect heat exchanger 25, a bypass line 27 for preventing the coolant in the cooling water line 19 from passing through the first indirect heat exchanger 24, and the bypass line 27 and the cooling water line 19 are connected. It consists of a three-way valve 28 or the like.

  The first indirect heat exchanger 24 is provided in a path of the cooling water line 19 and indirectly exchanges heat between the cooling water in the cooling water line 19 and the circulating water in the circulation line 26, so that the cooling Cooling water in the water line 19 is cooled.

  The second indirect heat exchanger 25 is provided in the path of the cooling water line 19 to supply heat obtained by heat exchange in the indirect condensing unit 8 to hot water utilization equipment (not shown) and the like. Make effective use.

  The three-way valve 28 adjusts the flow rate of allowing the cooling water in the cooling water line 19 to pass through the first indirect heat exchanger 24. This is because when the heat utilization of the hot water utilization facility is large, the cooling water in the cooling water line 19 is cooled by taking heat away, so that the flow rate passing through the bypass line 27 is increased. On the contrary, when the heat utilization of the hot water utilization facility is small and the outlet temperature of the indirect condenser 8 becomes a predetermined temperature or higher, the flow rate cooled by the heat exchange of the first indirect heat exchanger 24 is increased. Then, the vapor is allowed to pass through the indirect condensing unit 8 to promote vapor condensation.

  In the second embodiment, the second indirect heat exchanger 25 is provided, but in another modification, the cooling water heated by the indirect condenser 8 is directly supplied to the hot water utilization facility. You can also.

  According to the second embodiment, since the heat obtained from the indirect condenser 8 can be recovered by the hot water utilization facility, the steam from the exhaust gas boiler 2 can be used effectively.

Outline explanatory drawing of Example 1 which concerns on this invention Outline explanatory drawing of Example 2 concerning this invention

Explanation of symbols

1 Engine 2 Exhaust gas boiler (steam generating unit, high-performance water use device)
3 Main Steam Supply Line 4 1st Sub Steam Supply Line 6 Steam Ejector 7 Vacuum Cold Water Making Machine (Decompressed Part)
8 Indirect condensing unit 9 Condensate storage unit 10 Condensing device 11 Water ring vacuum pump (pressure reduction means)
12 Discharge pump (condensate discharge means)
14 Cooling tower (high-function water use device)

Claims (5)

  In an effective energy utilization system using a steam ejector connected to a decompressed part in a sub-steam supply line separate from a main steam supply line of a steam generation part that generates steam using engine exhaust gas, the steam ejector is A condensing device having an indirect condensing unit for condensing the vapor that has passed therethrough and a condensate water storage unit, a depressurizing unit for depressurizing the inside of the condensing device, a condensed water discharging unit for discharging condensed water from the condensing unit, and condensation An effective energy utilization system comprising a high-performance water use device that uses water as makeup water.   2. The energy efficient use system according to claim 1, wherein the high-function water using device is the steam generation unit and / or a cooling tower.   The effective use system of energy according to claim 2, wherein the cooling water passing through the indirect condensing unit is cooled by the cooling tower.   The effective use system of energy according to claim 2 or 3, wherein the cooling water line passing through the indirect condensing unit passes through one or more indirect heat exchangers. The said sub-steam supply line is provided with two or more, The energy effective use system of any one of Claims 1-4 characterized by the above-mentioned.

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