WO2014189288A1 - 캐스케이드 보일러 시스템의 제어방법 - Google Patents
캐스케이드 보일러 시스템의 제어방법 Download PDFInfo
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- WO2014189288A1 WO2014189288A1 PCT/KR2014/004543 KR2014004543W WO2014189288A1 WO 2014189288 A1 WO2014189288 A1 WO 2014189288A1 KR 2014004543 W KR2014004543 W KR 2014004543W WO 2014189288 A1 WO2014189288 A1 WO 2014189288A1
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- WIPO (PCT)
- Prior art keywords
- temperature
- flow rate
- boiler
- water temperature
- secondary side
- Prior art date
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- 238000000034 method Methods 0.000 title claims abstract description 38
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 33
- 239000008400 supply water Substances 0.000 claims description 39
- ZZUFCTLCJUWOSV-UHFFFAOYSA-N furosemide Chemical compound C1=C(Cl)C(S(=O)(=O)N)=CC(C(O)=O)=C1NCC1=CC=CO1 ZZUFCTLCJUWOSV-UHFFFAOYSA-N 0.000 claims description 32
- 238000000926 separation method Methods 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 description 6
- 239000008236 heating water Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D19/00—Details
- F24D19/10—Arrangement or mounting of control or safety devices
- F24D19/1006—Arrangement or mounting of control or safety devices for water heating systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D19/00—Details
- F24D19/10—Arrangement or mounting of control or safety devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D3/00—Hot-water central heating systems
- F24D3/10—Feed-line arrangements, e.g. providing for heat-accumulator tanks, expansion tanks ; Hydraulic components of a central heating system
- F24D3/1091—Mixing cylinders
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/20—Arrangement or mounting of control or safety devices
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/19—Control of temperature characterised by the use of electric means
- G05D23/1919—Control of temperature characterised by the use of electric means characterised by the type of controller
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B35/00—Control systems for steam boilers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D2200/00—Heat sources or energy sources
- F24D2200/04—Gas or oil fired boiler
- F24D2200/043—More than one gas or oil fired boiler
Definitions
- the present invention relates to a control method of a cascade boiler system, and more particularly to a control method of a cascade boiler system capable of precise heating control irrespective of the difference between the flow rate of the boiler side and the load side using a temperature sensor.
- the cascade boiler system is to connect a plurality of boilers in parallel to have a medium / large boiler capacity.
- the control method is difficult, but there is an advantage that the heating can be controlled according to the situation, and there is an advantage of extending the heating capacity as needed.
- the cascade system generally uses a configuration in which a hydro separator is provided between a boiler side in which a plurality of boilers are connected in parallel and a load side which is an indoor pipe. This is to prevent the occurrence of a shortage of heating water supply flow rate when the flow rate on the boiler side is lower than the required flow rate on the load side when a plurality of boilers are operated only in part depending on the situation.
- the hydro separator serves to replenish the heating water supply flow rate by mixing the return water returned from the load side to the boiler side with the heating water when the heating water flow rate supplied from the boiler side to the load side is small.
- 1 is a system configuration diagram for explaining a control method of a conventional cascade boiler system.
- a plurality of boilers 11, 12, 13, 14, and 15 are connected in parallel to a primary side 10, a secondary side 20 having loads 21 and 22, and the primary side 10. And a hydro separator 30 which interconnects the secondary side 20 and compensates the supply flow rate.
- the heating temperature is based on the supply water temperature T3 of the secondary side, and three boilers 13, 14, and 15 are operated on the primary side 10, so that each boiler 13, 14, and 15 is operated.
- the sum of the pump flow rates provided therein is supplied to the flow rate F1 of the primary side 10.
- the flow rate F1 of the primary side 10 and the flow rate F2 of the secondary side 20 are the same, a normal operation may be performed, but the flow rate F1 of the primary side 10 is the secondary side 20.
- the hydro separator is a portion of the flow rate returned from the secondary side 20 to the primary side 10 to the supply flow rate F1 of the primary side 10 in the hydro separator 30.
- the supplementary flow rate F3 of 30 is added to become the secondary side 20 flow rate F2.
- the flow rate F2 of the secondary side 20 passes through the supply water heated by the boilers 13, 14 and 15 of the primary side 10 and the loads 21 and 22 of the secondary side 20. Since the supplementary flow rate F3, which is a lower return water, is added, the supply water temperature T3 of the secondary side 20 becomes a lower temperature than the target temperature Tt.
- the secondary side 20 supplies water temperature (T3) to be controlled as close as possible to the target temperature (Tt), but it takes a lot of time, which may result in consumer complaints. There is a problem that can lower the consumer's confidence.
- the supply side temperature T3 of the secondary side 20 becomes the set temperature (1) in the state where the boiler 12 is operated. Difficulty in controlling such that it can be higher than Tt).
- the problem to be solved by the present invention in view of the above problems is to provide a control method of the cascade boiler system that can adjust the temperature of the heating water supply to the set temperature in a short time without using a flow meter or an external pump. .
- the present invention provides a control method of a cascade boiler system that can reduce the cost by calculating the flow rate required for the control, using a temperature sensor without using a relatively expensive flow meter.
- the control method of the cascade boiler system of the present invention for solving the above problems is provided between the primary side including a plurality of boilers, the secondary side including a load, and the primary side and the secondary side to compensate the flow rate
- a method of controlling a cascade boiler system comprising a hydro separate comprising the steps of: a) operating the boiler in a quantity set in an initial operation state; b) the primary feed water temperature and the return temperature of the hydro-separate; Detecting a secondary supply water temperature and a return temperature and calculating a flow rate compensated for in the hydro-separation using the detected temperature; and c) maintaining the initial operation state so that the secondary supply water temperature is a target temperature. And within the setting range, the set temperature which is the primary supply water temperature capable of maintaining the secondary supply water temperature. Shipment steps and, d) calculating the quantity of the boiler to maintain the calculated set point, and a step of controlling the operation of the boiler according to the quantity.
- Control method of the cascade boiler system of the present invention by operating all the boilers included in the system at the beginning of the operation to reach the set temperature faster, there is an effect that can increase the customer satisfaction.
- the cost can be reduced compared to the conventional system using the flow meter.
- the present invention calculates the number of operation of the boiler to maintain the set temperature and controls the operation of the boiler accordingly, there is an effect that can be adjusted to the level required for optimal operation of the boiler.
- 1 is a system configuration diagram for explaining a control method of a conventional cascade boiler system.
- FIG. 2 is a control flowchart of a cascade boiler system according to a preferred embodiment of the present invention.
- 3 to 5 are explanatory views showing a flow rate and a temperature relationship for explaining the control conditions of the present invention, respectively.
- first temperature sensor 2 second temperature sensor
- Figure 2 is a flow chart of a cascade boiler system control method according to a preferred embodiment of the present invention
- Figures 3 to 5 are explanatory views showing the flow rate and temperature relationship for explaining the control conditions of the present invention, respectively.
- the cascade boiler system control method according to a preferred embodiment of the present invention, the step of operating a number of boilers set in the initial operation of the plurality of boilers (11 to 15) to a set temperature (S10) And the flow rate F2 of the secondary side 20 using the temperature detected by the first to fourth temperature sensors 1, 2, 3, and 4 for detecting the temperature of the inlet and the outlet of the hydro separator 30;
- a step S20 of calculating the flow rate F3 of the hydro separator 30 that is the difference between the differential flow rate F1 and the secondary water supply 20 temperature is determined to be close to the target temperature T T.
- Step S60 determining whether an event for changing the operating condition has occurred (S70), and if the event occurs, changing the operating condition of the boiler according to the condition of the generated event (S80), and to the consumer. If it is confirmed that the operation setting is changed by the step S20 is configured to include the step (S90) to return to the step.
- the step S10 relates to the initial operation state, the number of boilers set to operate initially among the plurality of boilers 11 to 15 to operate at a set temperature.
- step S10 it is preferable to operate the boilers 11 to 15 provided on the primary side 10 of all cascade boiler systems to the maximum temperature, respectively.
- This initial operating state can be changed according to on-site conditions or consumer demand.
- step S20 the replenishment flow rate F3 of the hydro separator 30 using the temperatures T1, T2, T3, and T4 detected by the first to fourth temperature sensors 1, 2, 3, and 4. To calculate.
- the replenishment flow rate F3 of the hydro separator 30 is calculated by supplying water temperature T1 of the primary side 10 detected by the first temperature sensor 1 and the secondary side detected by the third temperature sensor 3.
- the supply water temperature T3 of the 20 is compared to determine the directivity of the supplementary flow rate F3 of the hydro separator 30 and the flow rate F1 of the primary side 10 and the flow rate F2 of the secondary side 20. can do.
- the supply water temperature T1 of the primary side 10 detected by the first temperature sensor 1 and the supply water temperature T3 of the secondary side 20 detected by the third temperature sensor 3 are represented. If the same, the flow rate F1 of the primary side 10 and the flow rate F2 of the secondary side 20 are the same, or the flow rate F1 of the primary side 10 is the flow rate F2 of the secondary side 20. It can be seen that the case is larger than that, the flow rate (F1) of the primary side 10 is represented by the sum of the flow rate (F3) of the secondary side 20 flow rate (F2) and the hydro separator 30.
- Equation 1 below may calculate the flow rate F3 of the hydro separator 30 when the flow rate F1 of the primary side 10 is greater than the flow rate F2 of the secondary side 20 as shown in FIG. 4. It is. However, when the flow rate F1 of the primary side 10 is large, there is no difficulty in controlling because the primary water supply temperature T1 of the primary side 10 and the secondary water supply temperature T3 of the secondary side 20 are the same.
- the supply water temperature T3 is larger than the flow rate F2 of the secondary side 20
- the flow rate F2 of the secondary side 20 is larger than that of the primary side 10.
- the secondary side 20 return temperature (T4) is a lower temperature than the respective supply water temperature (T1, T3), the secondary side (20) after the return to the hydro separator 30, the primary side ( 10) it is added to the flow rate F1 of the feed water to form a secondary water supply 20 temperature lower T3.
- the flow rate F3 of the hydro separator 30 may be calculated from Equation 2 below.
- the flow rate F3 of the hydro separator 30 represents a difference between the supply water temperature T1 of the primary side 10 and the supply water temperature T2 of the secondary side 20 and the secondary side ( It can be seen that it is divided by the difference between the feed water temperature T3 and the return water temperature T4 of 20), and the result is multiplied by the primary flow rate F1.
- the primary flow rate F1 since the primary flow rate F1 is equal to the sum of the pump capacities of the boilers 11 to 15 currently operating, the flow rate F3 of the hydro separator 30 may be calculated.
- the flow rate F1 of the primary side 10 is the secondary side 20.
- the supply water temperature T1 of the primary side 10 may be different from the supply water temperature T2 of the secondary side 20, resulting in difficulty in control.
- the flow rate F3 of the hydro separator 30 is periodically calculated, and the most recently calculated flow rate F3 is applied in the process to be described later.
- the proximity is set according to the system setting, and the supply water temperature T3 may be set as required by a range of ⁇ 1 ° C difference from the target temperature Tt.
- the proximity includes a case where the secondary supply water temperature T3 is equal to the target temperature Tt.
- the target temperature Tt is a heating temperature set by the consumer.
- step S10 If it is not narrowed to the above range, the operation state of step S10 is maintained, and if determined to be close, it is adjusted to the set temperature T1n which is a new supply water temperature instead of the current primary side 10 supply water temperature T1. This means that it is necessary to adjust the number of boilers 11 to 15 that are operated to the extent that the secondary water supply 20 temperature T3 can maintain the target temperature Tt.
- the set temperature (T1n) is to use the flow rate (F3) of the recently obtained hydro separator 30, it can be calculated by the following equation (3).
- T1n T3 + ((F3 ⁇ F1) ⁇ (T3-T4))
- the set temperature T1n is a new supply water temperature of the primary side 10, and the flow rate F3 of the hydro separator 30 is added to the flow rate F1 of the primary side 10 so that the flow rate of the secondary side 20 ( F2) is determined.
- the temperature of the feed water added in the hydro separator 30 is equal to the return temperature (T4) of the secondary side (20). Therefore, as a result of calculating the ratio of the flow rate F3 of the hydro separator 30 to the flow rate F1 of the primary side 10, the difference between the supply water temperature T3 and the return temperature T4 of the secondary side 20 is calculated.
- the multiplication result can be calculated by adding the secondary water 20 to the supply water temperature T3.
- the number of boilers 11 to 15 to be operated is calculated according to the calculated set temperature T1n.
- the number of boilers to be operated may be calculated by substituting the flow rate of each boiler and the number N of boilers to supply the flow rate in Equation 3 into the flow rate F1 of the primary side 10.
- the primary flow rate F1 is a value obtained by multiplying the flow rate per boiler by the number N of boilers to be operated.
- the flow rate per boiler is a constant, it is possible to calculate the number (N) of the boiler to operate using the equation (3).
- operation S60 the operation of each of the boilers 11 to 15 is controlled according to the calculated number N of boilers. If the number N of boilers to be operated is 3, the boilers 11 and 12 are stopped and the operating states of the boilers 13, 14 and 15 are maintained.
- step S70 it is checked whether an event relating to a change in an operating condition occurs while maintaining the step S60.
- the event to be considered is the case of operating below the set temperature (T1n) even when operating at the maximum capacity of the boilers 13, 14 and 15 currently operating (event A) or operating the boilers 13, 14 and 15 to the minimum capacity. Even if the set temperature T1n is exceeded (event B).
- the boiler 13 In the case of the event A can be solved by additionally operating the boiler 12, in the case of event B, the boiler 13 must be stopped in the operating state. However, it is not desirable to change the operating state when such an event is one-time and is maintained for a short time, and it is preferable to change the operating state of the boiler when the event A and the event B last more than the set time.
- step S80 performs a control to increase or decrease the number of boilers in operation according to the generated event.
- step S90 it is determined whether the consumer has changed a setting such as a change in the target temperature Tt, and if the setting is changed, the step S20 is again performed, and if not, the status is maintained.
- the present invention can control the operation of the cascade boiler system by calculating the flow rate at the temperature of the heating water or the return water flowing in or out based on the hydro separate 30 without using an expensive flow meter.
- the number of boilers that are initially operated can be determined by the control of the feed forward method, and then a rapid control can be performed by using a method of correcting an error by a feedback method.
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- Combustion & Propulsion (AREA)
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- Automation & Control Theory (AREA)
- Control Of Steam Boilers And Waste-Gas Boilers (AREA)
Abstract
Description
Claims (7)
- 다수의 보일러를 포함하는 1차측과, 부하를 포함하는 2차측과, 상기 1차측과 2차측의 사이에 마련되어 유량을 보상하는 하이드로 세퍼레이트를 포함하는 캐스케이드 보일러 시스템을 제어하는 방법에 있어서,a) 초기운전 상태에서 설정된 수량의 상기 보일러를 운전하는 단계;b) 상기 하이드로 세퍼레이트의 상기 1차측 공급수온도 및 환수온도와, 상기 2차측 공급수온도 및 환수온도를 검출하여, 상기 검출된 온도를 이용하여 상기 하이드로 세퍼레이트에서 보상되는 유량을 산출하는 단계;c) 상기 초기운전상태의 유지로 상기 2차측 공급수온도가 목표온도와 설정범위 내에 있으면, 상기 2차측 공급수온도를 유지할 수 있는 상기 1차측 공급수온도인 설정온도를 산출하는 단계;d) 상기 산출된 설정온도를 유지할 수 있는 상기 보일러의 수량을 산출하고, 그 수량에 따라 보일러의 운전을 제어하는 단계를 포함하는 캐스케이드 보일러 시스템의 제어방법.
- 제1항에 있어서,상기 d) 단계를 수행한 후,운전조건이 변경되는 이벤트가 발생하였는지 판단하여, 상기 이벤트가 발생한 경우, 상기 이벤트의 종류에 따라 상기 운전되는 보일러의 수를 조절하는 것을 특징으로 하는 캐스케이드 보일러 시스템의 제어방법.
- 제1항 또는 제2항에 있어서,상기 a) 단계는,상기 다수의 보일러 전체를 운전시켜, 상기 2차측 공급수온도가 상기 목표온도까지 도달하는 시간을 단축하는 것을 특징으로 하는 캐스케이드 보일러 시스템의 제어방법.
- 제1항 또는 제2항에 있어서,상기 b) 단계에서 산출되는 상기 하이드로 세퍼레이터의 보충 유량은 아래의 수학식 1로 산출되는 것을 특징으로 하는 캐스케이드 보일러 시스템의 제어방법.수학식 1F3=(F2×(T2-T4))÷(T1-T2)수학식 1에서 F3은 하이드로 세퍼레이터의 보충 유량, T1은 상기 1차측의 공급수온도, T3은 2차측의 공급수온도, T4는 2차측의 환수온도이고, F1은 1차측의 유량으로서 운전되는 보일러들의 펌프 용량의 총합인 상수
- 제1항 또는 제2항에 있어서,상기 c) 단계에서 산출되는 상기 설정온도는 아래의 수학식 2로 산출되는 것을 특징으로 하는 캐스케이드 보일러 시스템의 제어방법.수학식 2F3=(F1×(T1-T3))÷(T3-T4)수학식 2에서 T1n은 설정온도이고, T3은 2차측 공급수온도, F1은 1차측 유량, F3은 하이드로 세퍼레이터의 보충 유량, T4는 2차측 환수온도로서 상기 하이드로 세퍼레이터의 보충수 온도와 동일
- 제5항에 있어서,상기 d) 단계에서 상기 1차측 공급수온도인 설정온도를 유지하기 위하여 운전되는 보일러의 수량은, 상기 수학식 2에서 상기 F1에 상수인 보일러 한 대의 유량과 운전되는 보일러 수량의 곱을 대입하여 산출하는 것을 특징으로 하는 캐스케이드 보일러 시스템의 제어방법.
- 제2항에 있어서,상기 이벤트는,현재 운전중인 보일러의 최대열량의 합이 상기 설정온도보다 낮거나,현재 운전중인 보일러의 최소열량의 합이 상기 설정온도보다 높은 것을 특징으로 하는 캐스케이드 보일러 시스템의 제어방법.
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP14800380.9A EP3006858A4 (en) | 2013-05-24 | 2014-05-21 | Method for controlling cascade boiler system |
CN201480029998.6A CN105247295B (zh) | 2013-05-24 | 2014-05-21 | 级联锅炉系统的控制方法 |
US14/892,466 US9777947B2 (en) | 2013-05-24 | 2014-05-21 | Method for controlling cascade boiler system |
RU2015155256A RU2618157C1 (ru) | 2013-05-24 | 2014-05-21 | Способ для регулирования каскадной системы котлов |
CA2913109A CA2913109C (en) | 2013-05-24 | 2014-05-21 | Method for controlling cascade boiler system |
Applications Claiming Priority (2)
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KR1020130059018A KR101433084B1 (ko) | 2013-05-24 | 2013-05-24 | 캐스케이드 보일러 시스템의 제어방법 |
KR10-2013-0059018 | 2013-05-24 |
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WO2014189288A1 true WO2014189288A1 (ko) | 2014-11-27 |
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PCT/KR2014/004543 WO2014189288A1 (ko) | 2013-05-24 | 2014-05-21 | 캐스케이드 보일러 시스템의 제어방법 |
Country Status (7)
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US (1) | US9777947B2 (ko) |
EP (1) | EP3006858A4 (ko) |
KR (1) | KR101433084B1 (ko) |
CN (1) | CN105247295B (ko) |
CA (1) | CA2913109C (ko) |
RU (1) | RU2618157C1 (ko) |
WO (1) | WO2014189288A1 (ko) |
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US9746190B2 (en) * | 2014-06-06 | 2017-08-29 | Intellihot, Inc. | Combined heating system capable of bi-directional heating |
KR101647128B1 (ko) | 2014-09-30 | 2016-08-09 | 린나이코리아 주식회사 | 대기 대수 조정가능 캐스케이드 시스템 및 그 제어 방법 |
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Also Published As
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US20160116185A1 (en) | 2016-04-28 |
CN105247295B (zh) | 2018-04-24 |
EP3006858A1 (en) | 2016-04-13 |
CA2913109C (en) | 2018-03-06 |
KR101433084B1 (ko) | 2014-08-25 |
RU2618157C1 (ru) | 2017-05-02 |
EP3006858A4 (en) | 2017-03-29 |
CA2913109A1 (en) | 2014-11-27 |
CN105247295A (zh) | 2016-01-13 |
US9777947B2 (en) | 2017-10-03 |
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