WO2011139011A1 - Dispositif de dégivrage pour évaporateur à convection naturelle d'un appareil de stockage basse-température - Google Patents

Dispositif de dégivrage pour évaporateur à convection naturelle d'un appareil de stockage basse-température Download PDF

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Publication number
WO2011139011A1
WO2011139011A1 PCT/KR2010/008426 KR2010008426W WO2011139011A1 WO 2011139011 A1 WO2011139011 A1 WO 2011139011A1 KR 2010008426 W KR2010008426 W KR 2010008426W WO 2011139011 A1 WO2011139011 A1 WO 2011139011A1
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WIPO (PCT)
Prior art keywords
evaporator
cooling pipe
electrode plate
frost
pipe
Prior art date
Application number
PCT/KR2010/008426
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English (en)
Korean (ko)
Inventor
박광균
Original Assignee
주식회사 제일화인테크
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Application filed by 주식회사 제일화인테크 filed Critical 주식회사 제일화인테크
Publication of WO2011139011A1 publication Critical patent/WO2011139011A1/fr

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
    • F25D21/06—Removing frost
    • F25D21/08—Removing frost by electric heating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
    • F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
    • F28D1/04—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits
    • F28D1/047—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being bent, e.g. in a serpentine or zig-zag
    • F28D1/0475—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being bent, e.g. in a serpentine or zig-zag the conduits having a single U-bend
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F19/00—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers
    • F28F19/006—Preventing deposits of ice
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/11—Sensor to detect if defrost is necessary
    • F25B2700/111—Sensor to detect if defrost is necessary using an emitter and receiver, e.g. sensing by emitting light or other radiation and receiving reflection by a sensor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
    • F28D2021/0019—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for
    • F28D2021/0068—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for for refrigerant cycles
    • F28D2021/0071—Evaporators
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/14—Thermal energy storage

Definitions

  • the present invention is to remove the freezing of the natural convection evaporator for cold storage configured to increase the cooling efficiency in the warehouse by preventing the over-cooling of the evaporator which is exposed to the interior of the warehouse to supply cold air in natural convection in real time
  • the apparatus relates to a device, and more particularly, when frost is accumulated on the surface of the cooling pipe coupled to the evaporator, the received light amount is changed by the energization signal of the electrode sensor energized by the accumulated frost and frost accumulated on the surface of the cooling pipe.
  • the present invention relates to an ice freezing device for a natural convection evaporator for a low temperature warehouse.
  • the applicant of the present invention is a natural convection cooling device for low temperature warehouse supplying cold air in a natural convection type (utility model registration application: 2004-25038, dual patent application: 2005-32448, patent Application No. 2005-74783) has been filed and registered.
  • Figure 1 is a block diagram of a conventional cold storage natural convection type cooling apparatus
  • Figure 2 is a view showing an evaporator extracted from FIG.
  • the air conditioner 200 includes an outdoor unit 200a installed outside the warehouse, a cooling pipe 210 supplied with a refrigerant from the outdoor unit 200a, and It has a support frame 220 for supporting the cooling pipe 210, the evaporator 200b for condensing the refrigerant supplied to the cooling pipe 210 to provide cold air to the warehouse, and the condensate generated from the evaporator (200b) It consists of a water collecting tank (250) for collecting water.
  • the evaporator 200b is a heating pipe 230 for providing a high heat to prevent over-cooling of the cooling pipe 210 and a power supply 240 for supplying power to the heating pipe 230. It includes more.
  • the air conditioner 200 exposes the evaporator 200b to the inside of the warehouse, and circulates in a natural convection type by the temperature difference in the warehouse, thereby cooling the warehouse.
  • the evaporator 200b is defrosted (defrosted) by the heating pipe 230 which generates heat intermittently for a time set by the power supply unit 240.
  • only the operating time of the evaporator 200b is counted for the time set by the power supply 240 intermittently during the time that the evaporator 200b is operated, that is, the idle time when the evaporator 200b is not operated.
  • the frost may be defrosted by the heating pipe 230 that generates heat.
  • the heating pipe 230 is set to be operated for 5 minutes every 4 hours, the evaporator 200b is not operated at all times because the evaporator 200b is operated according to the set temperature inside the warehouse. Therefore, the heating pipe 230 is operated for 5 minutes to perform the defrosting operation when the set time is counted and accumulated only the operating time excluding the rest time by the internal temperature of the warehouse.
  • the heating pipe operating for a certain time cannot remove all of the frost excessively accumulated in the cooling pipe.
  • the present invention has been made in view of the above problems, and the first object of the present invention is to cool the frost on the surface of the cooling pipe of the evaporator so that the cooling efficiency due to overcooling can be prevented from being lowered.
  • the present invention provides a defrosting device for a natural convection evaporator for a low temperature warehouse that can detect and remove frost accumulated on the surface of a pipe in real time.
  • the third object of the present invention when frost is accumulated on the surface of the cooling pipe coupled to the evaporator, detects the amount of light received by the energization signal of the electrode sensor that is energized by the accumulated frost and frost accumulated on the surface of the cooling pipe. By determining whether the heating pipe is operated together with the detection signal of the photosensor, the frost accumulated on the surface of the refrigerant pipe can be completely removed, and the power consumption due to the malfunction of the heating pipe can be minimized.
  • An object of the present invention is to provide a defrosting device for a natural convection evaporator for a low temperature warehouse that can prevent overcooling in real time.
  • the first invention relates to a device for removing ice from a natural convection evaporator for a low temperature warehouse, and supports a cooling pipe and a cooling pipe supplied with a refrigerant from an outdoor unit.
  • the low temperature warehouse natural convection type air conditioner comprising a power supply unit for supplying power to the heating pipe, the first electrode plate and the second electrode plate spaced apart from each other to detect frost accumulated on the cooling pipe of the evaporator
  • An electrode sensor disposed in a short-circuit state with a gap between the cooling pipes and the light emitted from the light emitting unit;
  • a photo sensor which detects the presence or absence of frost by a change in the amount of received light when the surface is reflected and incident to the light receiving portion;
  • a controller configured to remove frost accumulated on the cooling pipe by determining whether the current for the heating pipe is applied when the energization of the electrode sensor and the change in the amount of received light of the photosensor are sensed together.
  • the electrode sensor in the first invention, is characterized in that it further comprises a gap adjusting means to control whether or not the electricity supply according to the amount of frost.
  • the gap adjusting means includes a linear motor including a linear guide and a slider which is moved along the linear guide, and the slider of the linear motor is coupled to the second electrode plate.
  • the second electrode plate is configured to be elevated relative to the first electrode plate.
  • the gap adjusting means is composed of a servo motor and a ball screw coupled to the servo motor, the ball screw is screw-coupled with the second electrode plate to the second electrode plate It is characterized in that the electrode plate is configured to be elevated.
  • the freezing removal device of the natural convection evaporator for low temperature warehouse According to the freezing removal device of the natural convection evaporator for low temperature warehouse according to the present invention, it is possible to adjust the defrosting according to the thickness of the frost accumulated on the cooling pipe has the effect of more efficient defrosting work.
  • FIG. 1 is a configuration diagram of a conventional low-temperature warehouse natural convection type air conditioner
  • FIG. 2 is a block diagram showing an evaporator extracted from FIG.
  • Figure 3 is a block diagram of a device for removing ice in a natural convection evaporator for a cold store according to the present invention
  • FIG. 4 is a configuration diagram showing the installation state of the electrode sensor and the photosensor of the present invention in the evaporator
  • FIG. 5 is a conceptual diagram of installation of an electrode sensor according to another embodiment of the present invention.
  • FIG. 6 is a conceptual diagram showing an operating state of the photosensor of the present invention
  • Figure 7 is a flow chart of the ice removal device of the natural convection evaporator for cold storage according to the present invention.
  • the conventional natural convection cooling device 200 to expose the evaporator 200b to the interior of the warehouse to supply cold air in a natural convection type
  • the cooling pipe 210 receives the refrigerant from the outdoor unit (200a) and the support frame for supporting the cooling pipe 210
  • a power supply unit 240 for supplying power to the heating pipe 230.
  • the divergence of the cold air of the evaporator 200b emits cold air through the refrigerant pipe 210 and the cooling fins 211 attached to the refrigerant pipe.
  • the natural convection cooling device 200 is a device for supplying cold air to the interior of the warehouse by the natural convection method by the temperature difference by exposing the evaporator (200b) to the interior of the warehouse.
  • Figure 3 is a block diagram of the ice removal device of the natural convection evaporator for low temperature warehouse according to the present invention
  • Figure 4 is a block diagram showing the installation state of the electrode sensor and the photo sensor of the present invention in the evaporator
  • Figure 5 6 is a conceptual diagram illustrating an installation of an electrode sensor according to another exemplary embodiment of the present invention
  • FIG. 6 is a conceptual diagram illustrating an operating state of a photosensor of the present invention.
  • the present invention has accumulated frost on the surface of the cooling pipe 210 of the evaporator 200b so that the cooling efficiency can be prevented from being lowered due to overcooling.
  • the present invention relates to a defrosting device 100 for a natural convection evaporator for a low temperature warehouse configured to detect frost and remove frost through a heating pipe.
  • the freezing device 100 of the natural convection evaporator for the cold store is largely composed of three parts, which includes an electrode sensor 110, a photo sensor 130, and a controller 140.
  • the electrode sensor 110 is short-circuited with the first electrode plate 111 and the second electrode plate 112 spaced apart from each other to detect frost accumulated on the surface of the cooling pipe 210 by energization. Are placed in a state.
  • frost is filled in the space between the first electrode plate 111 and the second electrode plate 112 to form the first electrode plate 111 and the second electrode plate 112.
  • it will be configured to detect the super-cooled cooling pipe (210).
  • the first electrode plate 111 may be configured to be grounded to the cooling pipe 210, and the second electrode plate 112 may be configured to be connected to a separate power source or a power source 240 to supply power. can do.
  • the electrode sensor 110 may further include a gap adjusting means 120 to control whether or not the current is supplied in accordance with the amount of frost accumulated on the surface of the cooling pipe (210).
  • the interval adjusting means 120 is for arbitrarily adjusting the amount of frost accumulated on the surface of the cooling pipe 210 according to the size of the scale of the evaporator (200b). This is because the diameter of the cooling pipe 210 also varies according to the size of the evaporator (200b), to arbitrarily adjust the operation of the heating pipe 210 according to the appropriate amount to increase the power efficiency.
  • the gap adjusting means 120 may be formed of a linear motor including a linear guide 121a and a slider 121b that is transported along the linear guide 121a to enable precise control.
  • the linear motor combines the slider 121b transferred along the linear guide 121a with the second electrode plate 112 so that the second electrode plate 112 can be lifted with respect to the first electrode plate 111.
  • the linear guide 121a may be fixed to the cooling fin 211 by attaching to the cooling fin 211 in one embodiment, and fixed to the bottom of the sump tank 250 in another embodiment.
  • the distance from the first electrode plate 111 can be adjusted through the second electrode plate 112 that moves up and down the separation space.
  • the heating pipe is operated according to the amount of frost filled in the separation space. It can be adjusted arbitrarily.
  • the electrode sensor 110 may be composed of a single first electrode plate 111 is disposed in a short circuit with the surface of the cooling pipe 210.
  • the first electrode plate 111 may be coupled to the slider 121b of the linear motor to be elevated on the surface of the cooling pipe 210.
  • the interval adjusting means 120 may be composed of a servo motor 122, a ball screw 122a coupled to the servo motor 122, as shown in FIG.
  • the ball screw 122a is configured to be screw-coupled with the second electrode plate 112 so that the second electrode plate 112 can be elevated along the ball screw 122a with respect to the first electrode plate 111.
  • the servo motor 122 may be fixed to the bracket 123 coupled to the cooling fin 211.
  • the above structure is configured to precisely control the rotation RPM along with the forward / reverse rotation of the servomotor 122, and as a result, can automatically adjust the amount of frost.
  • the electrode sensor 110 may be composed of a single first electrode plate 111 is disposed in a short circuit with the surface of the cooling pipe 210.
  • the first electrode plate 111 may be screw-coupled to the ball screw 122a coupled to the servomotor 122 so that the first electrode plate 111 may be elevated on the surface of the cooling pipe 210.
  • the gap adjusting means 120 may be composed of only the ball screw (122a) is coupled to the bearing 124a to the support rod 124 fixed to the cooling fins.
  • the above structure rotates the ball screw 122a with a tool such as a screwdriver so that the second electrode plate 112 screwed to the ball screw 122a is lifted, resulting in the first electrode plate 111 and the second electrode.
  • the spacing of the separation spaces formed between the plates 112 can be adjusted to manually adjust the amount of frost.
  • the first electrode plate 111 may be configured to be screwed to the ball screw 122a to be elevated on the surface of the cooling pipe 210.
  • the photosensor 130 may be fixed by inserting in the space between the cooling fin 211 and the cooling fin 211, the first electrode plate 111 and the second electrode plate 112 of the electrode sensor 110 When the foreign matter is inserted into the separation space is energized, to prevent the misjudgment of the control unit 140, as shown in Figure 6, the light emitted from the light emitting unit 131 is provided with a cooling pipe (evaporator 200b) When reflecting the surface of the 210 is incident to the light receiving unit 130, it detects the presence of frost by the change in the amount of light received.
  • the photosensor 130 may be configured to be electrically connected to the power supply 240 or a separate power or electrode sensor 110.
  • the controller 140 determines whether the current is applied to the heating pipe 230 when the energization of the electrode sensor 110 and the amount of change in the amount of received light of the photosensor 130 are sensed together, and is then stored in the cooling pipe 210. Functions to remove frost.
  • Figure 7 is a flow chart of the ice removal device of the natural convection evaporator for cold storage according to the present invention.
  • the photosensor when frost is accumulated on the surface of the cooling pipe, the photosensor first detects the presence of frost accumulated on the surface of the cooling pipe.
  • the energization signal is output to the controller.
  • control unit receives an energization signal according to the energization of the electrode sensor, and if the change detection signal of the photo sensor is not input, it is determined that the electrode sensor is energized by the foreign matter to determine whether the current to the heating pipe. It will not generate an acceptable output signal.
  • the output signal for approving the application of the current to the heating pipe is determined by determining that the accumulated amount of frost accumulated in the cooling pipe is lower than the reference value. It does not occur.
  • the frost is accumulated on the surface of the cooling pipe above the reference value, that is, overcooled. It is determined that the state is to provide an output signal for approving the application of the heating pipe current.
  • the electrode sensor When the frost is removed as the heating pipe is operated, the electrode sensor is not energized.
  • the controller determines that the frost is not completely removed and continues the output signal for approving the application of current to the heating pipe. To provide.
  • the controller determines that the frost is completely removed from the surface of the cooling pipe and does not generate an output signal for approving the application of the current to the heating pipe.
  • the control unit may stop the operation of the heating pipe only by the energization of the electrode sensor, which is preferable because the remaining frost, that is, the frost is not completely removed. Not.
  • the present invention compares the light receiving amount changed by the frost accumulated on the surface of the cooling pipe, as well as whether the electrode sensor is energized by the frost accumulated on the surface of the cooling pipe, and thereby generates heat generated by heating the cooling pipe.
  • the ice removing device 100 of the natural convection evaporator for a low temperature warehouse may be installed in the water collecting tank 250 to prevent freezing of the water collecting tank 250.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Defrosting Systems (AREA)

Abstract

La présente invention se rapporte à un dispositif de dégivrage pour l'évaporateur à convection naturelle d'un appareil de stockage basse-température. Pour cela, l'évaporateur à convection naturelle d'un appareil de stockage basse-température se compose d'un évaporateur qui comporte un tuyau de refroidissement destiné à recevoir un apport en fluide caloporteur en provenance d'un équipement extérieur et possède un cadre de support destiné à supporter le tuyau de refroidissement et qui fournit de l'air de refroidissement à un appareil de stockage basse-température par étranglement du fluide caloporteur apporté au tuyau de refroidissement, et se compose d'une cuve de collecte d'eau qui est accouplée à l'évaporateur et collecte l'eau condensée, d'un tuyau d'émission de chaleur qui est installé dans l'évaporateur et garantit une température élevée tout en émettant de la chaleur, et d'une unité d'alimentation qui alimente le tuyau d'émission de chaleur, et cet évaporateur à convection naturelle comprend : un capteur à électrodes dans lequel une première plaque d'électrode et une seconde plaque d'électrode sont disposées dans un état court-circuité avec un intervalle d'espacement entre elles de manière à pouvoir détecter une accumulation de givre sur le tuyau de refroidissement de l'évaporateur ; un photo-détecteur qui détecte s'il y a du givre au moyen de changements de la quantité de lumière reçue lorsque la lumière émise depuis une unité d'émission de lumière est réfléchie sur la surface du tuyau de refroidissement disposé dans l'évaporateur et tombe incidente sur une unité de réception de lumière ; et une unité de commande qui retire le givre qui s'est accumulé sur le tuyau de refroidissement par une opération consistant à juger s'il faut appliquer un courant au tuyau d'émission de chaleur lors de la détection d'un courant dans le capteur à électrodes ainsi que d'un changement de la quantité de lumière reçue dans le photo-détecteur.
PCT/KR2010/008426 2010-05-04 2010-11-26 Dispositif de dégivrage pour évaporateur à convection naturelle d'un appareil de stockage basse-température WO2011139011A1 (fr)

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KR1020100042016A KR100973070B1 (ko) 2010-05-04 2010-05-04 저온창고용 자연대류식 증발기의 결빙제거장치
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Cited By (2)

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CN111569604A (zh) * 2020-05-18 2020-08-25 中国华能集团有限公司 一种烟气低温吸附脱硫方法
CN111569603A (zh) * 2020-05-18 2020-08-25 中国华能集团有限公司 一种基于低温吸附原理的烟气一体化脱硫脱硝方法

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WO2015030369A1 (fr) * 2013-08-26 2015-03-05 주식회사 신진에너텍 Appareil de dégivrage d'évaporateur dans un système de réfrigération, utilisant un capteur à diode électroluminescente pour lumière infrarouge
KR101788095B1 (ko) 2016-08-04 2017-11-16 주식회사 신아 냉각기용 열교환기의 성에제거 장치
KR101911729B1 (ko) * 2018-08-20 2018-10-25 노봉호 저장성이 개선된 두부 저장 창고
KR102581417B1 (ko) * 2021-08-27 2023-09-22 세연기업 주식회사 복합 열원 축냉축열 냉난방 시스템
KR102387389B1 (ko) * 2021-09-15 2022-04-15 아브라텍 주식회사 냉동기의 성에 제거용 자동 제상 장치

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Publication number Priority date Publication date Assignee Title
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CN111569603A (zh) * 2020-05-18 2020-08-25 中国华能集团有限公司 一种基于低温吸附原理的烟气一体化脱硫脱硝方法

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